US20080032155A1 - Drill stack formation - Google Patents
Drill stack formation Download PDFInfo
- Publication number
- US20080032155A1 US20080032155A1 US11/866,629 US86662907A US2008032155A1 US 20080032155 A1 US20080032155 A1 US 20080032155A1 US 86662907 A US86662907 A US 86662907A US 2008032155 A1 US2008032155 A1 US 2008032155A1
- Authority
- US
- United States
- Prior art keywords
- plate
- stack
- layer
- removable adhesive
- sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
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- 230000001070 adhesive effect Effects 0.000 claims abstract description 46
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 claims abstract 21
- 230000008878 coupling Effects 0.000 claims abstract 8
- 238000010168 coupling process Methods 0.000 claims abstract 8
- 238000005859 coupling reaction Methods 0.000 claims abstract 8
- 239000012790 adhesive layer Substances 0.000 claims abstract 5
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 14
- 239000005715 Fructose Substances 0.000 claims description 10
- 229930091371 Fructose Natural products 0.000 claims description 10
- RFSUNEUAIZKAJO-ARQDHWQXSA-N Fructose Chemical compound OC[C@H]1O[C@](O)(CO)[C@@H](O)[C@@H]1O RFSUNEUAIZKAJO-ARQDHWQXSA-N 0.000 claims description 10
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 239000004593 Epoxy Substances 0.000 claims description 5
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- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 5
- 229910001374 Invar Inorganic materials 0.000 claims description 3
- 229930006000 Sucrose Natural products 0.000 claims description 3
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
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- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
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- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims 1
- 229910052750 molybdenum Inorganic materials 0.000 claims 1
- 239000011733 molybdenum Substances 0.000 claims 1
- 238000000034 method Methods 0.000 description 5
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- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
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- 238000012986 modification Methods 0.000 description 2
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Images
Classifications
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- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B35/00—Methods for boring or drilling, or for working essentially requiring the use of boring or drilling machines; Use of auxiliary equipment in connection with such methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/06—Interconnection of layers permitting easy separation
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/44—Manufacturing insulated metal core circuits or other insulated electrically conductive core circuits
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2222/00—Materials of tools or workpieces composed of metals, alloys or metal matrices
- B23B2222/21—Copper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2222/00—Materials of tools or workpieces composed of metals, alloys or metal matrices
- B23B2222/41—Nickel steel alloys, e.g. invar®
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2222/00—Materials of tools or workpieces composed of metals, alloys or metal matrices
- B23B2222/64—Nickel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2240/00—Details of connections of tools or workpieces
- B23B2240/21—Glued connections
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/15—Position of the PCB during processing
- H05K2203/1536—Temporarily stacked PCBs
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/0011—Working of insulating substrates or insulating layers
- H05K3/0044—Mechanical working of the substrate, e.g. drilling or punching
- H05K3/0047—Drilling of holes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/10—Methods of surface bonding and/or assembly therefor
- Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
- Y10T156/1056—Perforating lamina
- Y10T156/1057—Subsequent to assembly of laminae
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/11—Methods of delaminating, per se; i.e., separating at bonding face
- Y10T156/1168—Gripping and pulling work apart during delaminating
- Y10T156/1179—Gripping and pulling work apart during delaminating with poking during delaminating [e.g., jabbing, etc.]
- Y10T156/1184—Piercing layer during delaminating [e.g., cutting, etc.]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
- Y10T428/12556—Organic component
- Y10T428/12569—Synthetic resin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/14—Layer or component removable to expose adhesive
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/14—Layer or component removable to expose adhesive
- Y10T428/149—Sectional layer removable
- Y10T428/1495—Adhesive is on removable layer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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- Y10T428/24273—Structurally defined web or sheet [e.g., overall dimension, etc.] including aperture
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
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- Y10T428/24273—Structurally defined web or sheet [e.g., overall dimension, etc.] including aperture
- Y10T428/24322—Composite web or sheet
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T428/2804—Next to metal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/04—Processes
- Y10T83/0476—Including stacking of plural workpieces
Definitions
- the present invention relates to a method of temporarily adhering a stack of sheets together to facilitate drilling a hole through the stack of sheets.
- a stack of sheets may be adhered together around a periphery of each sheet using an adhesive such as a glass cloth impregnated with epoxy. Hole burring occurs as a drill passes through the stack. Additionally, each sheet separates from an adjacent sheet as the drill passes between the sheets. This results in the whole stack of sheets expanding.
- An alternate method includes the permanent application of cured epoxy over the entire surface of each sheet in the stack. The thickness of the epoxy between each sheet results in excessive thickness of the overall stack as well as composites which will contain the separated sheets when they are processed into composites. A method of drilling a stack of sheets that overcomes these problems plus others is desired.
- a first general aspect of the present invention provides a structure comprising:
- a stack comprising a plurality of sheets such that each successive sheet is coupled with a removable adhesive between each sheet
- a second general aspect of the present invention provides a structure comprising:
- each successive stack is coupled with a removable adhesive to an intermediate layer between each stack wherein each intermediate layer prevents burr formation;
- each stack comprises a plurality of sheets such that each successive sheet is coupled with a removable adhesive between each sheet.
- a third general aspect of the present invention provides a method comprising:
- a forth general aspect of the present invention provides a method comprising:
- FIG. 1 illustrates a first embodiment of the present invention including a side view of a laminated structure including a stack comprising a plurality of sheets including a removable adhesive between each sheet;
- FIG. 2 illustrates a second embodiment of the present invention including a side view of a laminated structure including a plurality of stacks including a plurality of layers separating each stack;
- FIG. 3 illustrates a third embodiment of the present invention including an exploded side view of another embodiment of a laminated structure including a plurality of blotter sheets and a plurality plates added to a stack;
- FIG. 4 illustrates the laminated structure of FIG. 3 positioned within a press apparatus for forming a rigid stack
- FIG. 5 illustrates the rigid stack of FIG. 4 with a burr free hole drilled through each sheet of the stack
- FIG. 6 illustrates a plan view of a hole within a sheet of the stack
- FIG. 7 illustrates a flow chart of a method for producing a burr free hole in each sheet of the stack.
- FIG. 1 illustrates a schematic view of a laminated structure 10 including a stack 12 in accordance with a first embodiment.
- the stack 12 includes a plurality of sheets 14 A- 14 L.
- a removable adhesive 16 A- 16 K is applied between each sheet 14 A- 14 L, respectively.
- the sheets 14 A- 14 L may comprise any suitable material (e.g., copper, invar, copper-invar-copper, etc.). Invar is an iron-nickel alloy.
- the removable adhesive 16 A- 16 K may comprise any suitable material (e.g., fructose, sucrose, water soluble polymers, water, etc.).
- the material may comprise any suitable form (e.g., powered fructose, a liquid, a liquid solution, etc.).
- FIG. 2 illustrates a laminated structure 10 A including a stack 12 A in accordance with a second embodiment.
- the stack 12 A includes a plurality of stacks 12 C, 12 D, 12 E, and 12 F interspersed with a plurality of layers 18 A- 18 E.
- Each stack 12 C, 12 D, 12 E and 12 F includes a plurality of sheets 14 with removable adhesive placed between each sheet 14 .
- the removable adhesive 16 is placed between each layer 18 A- 18 E and each adjacent sheet 14 .
- Each layer 18 B and 18 C prevents chip build up within drill bit flutes 21 by providing an interruption in the sheet 14 being drilled.
- Each layer 18 A- 18 E comprises any suitable soft material (e.g., impregnated and laminated epoxy/glass, phenolic/paper laminate, aluminum, etc.).
- each sheet 14 is copper
- each layer 18 A- 18 E is (aluminum or paper/phenolic)
- any tendency for chip build up would be interrupted each time the drill bit 20 passes from copper to (aluminum or paper/phenolic), or from (aluminum or paper/phenolic) to copper.
- the first layer 18 A keeps the drill bit from wandering as it enters the stack 12 A of the laminated structure 10 A.
- FIG. 3 illustrates a laminated structure 10 B including a stack 12 B in accordance with a third embodiment.
- the stack 12 B includes a plurality of sheets 14 .
- the removable adhesive 16 is applied between each sheet 14 .
- the stack 12 B includes a first surface 24 and a second surface 26 .
- a first surface 28 A of a first layer 18 F is coupled with the removable adhesive 16 to the first surface 24 of the stack 12 B.
- a first surface 30 A of a second layer 18 G is coupled with the removable adhesive 16 to the second surface 26 of the stack 12 B.
- a first surface 32 A of a first foil 34 A contacts a second surface 28 B of the first layer 18 F.
- a first surface 36 A of a second foil 34 B contacts a second surface 30 B of the second layer 18 G.
- a first surface 38 A of a first plate 50 A contacts a second surface 32 B of the first foil 34 A.
- a first surface 40 A of a second plate 50 B contacts a second surface 36 B of the second foil 34 B.
- a first surface 42 A of a third plate 50 C contacts a second surface 38 B of the first plate 50 A.
- a first surface 44 A of a fourth plate 50 D contacts a second surface 40 B of the second plate SOB.
- the plates 50 A- 50 D may include any suitable material, such as stainless steel.
- the laminated structure 10 B includes a first blotter pad 60 A and a second blotter pad 60 B.
- the first blotter pad 60 A includes at least one blotter sheet 62
- the second blotter pad 60 B includes at least one blotter sheet 62 .
- the blotter sheets 62 may include any suitable compressible material, such as paper.
- the blotter pads 60 A and 60 B absorb any misalignment between a pair of pressure surfaces 90 A and 90 B ( FIG. 4 ) and the stack 12 B, so that a uniform pressure is applied to the stack 12 B.
- a first surface 64 A of the first blotter pad 60 A contacts a second surface 42 B of the third plate 50 C.
- a first surface 66 A of the second blotter pad 60 B contacts a second surface 44 B of the fourth plate 50 D.
- a second surface 64 B of the first blotter pad 60 A contacts a first surface 66 A of a fifth plate 50 E.
- a second surface 66 B of the second blotter pad 60 B contacts a first surface 68 A of a sixth plate 50 F.
- the plates 50 E and 50 F may include any suitable material, such as stainless steel.
- FIG. 4 illustrates the laminated structure 10 B of FIG. 3 positioned within a press apparatus 92 .
- the press apparatus 92 includes a first pressure head 94 A, a second pressure head 94 B, a vacuum source 96 , and a heat source 98 .
- the first pressure head 94 A and the second pressure head 94 B provide a compressive force 100 to the laminated structure 10 B.
- a second surface 66 B of the fifth plate 50 E contacts the pressure surface 90 A of the first pressure head 94 A.
- a second surface 68 B of the sixth plate 50 F contacts the pressure surface 90 B of the second pressure head 94 B.
- FIG. 7 illustrates a flow chart of a method for producing a burr free hole 102 in each sheet 14 of the stack 12 B ( FIGS. 5 and 6 ).
- Step 104 includes stacking a plurality of sheets 14 to form the stack 12 B.
- Step 106 includes applying a removable adhesive 16 between each successive sheet 14 in the stack 12 B.
- Step 108 includes applying the removable adhesive 16 between the first layer 18 F and the first surface 24 of the stack 12 B.
- the removable adhesive 16 may comprise any suitable material (e.g., fructose, sucrose, water soluble polymers, water, water solutions, etc.). The following example describes using the removable adhesive 16 in the form of solid powered fructose.
- Step 110 includes applying the removable adhesive 16 between the second layer 18 G and the second surface 26 of the stack 12 B.
- Step 111 includes forming the laminated structure 10 B by applying the foil sheets 34 A, 34 B the 50 A- 50 F, and the blotter pads 60 A and 60 B to the stack 12 B, as illustrated in FIG. 7 .
- Step 112 includes applying a vacuum to the laminated structure 10 B using the vacuum source 96 .
- Step 114 includes heating the laminated structure 10 B to melt the removable adhesive 16 .
- Step 116 includes applying the compressive force 100 to the laminated structure 10 B.
- the heat source 98 provides a temperature of about 50° C. to 200° C. and a first compressive force 100 applied to the laminated structure 10 B creates a pressure of about 25 to 75 psig.
- the fructose particles start to soften, and the pressure is increased to about 200 to 400 psig.
- the increase in pressure is delayed to ensure that every fructose particle has been softened to prevent denting of the sheets 14 .
- the pressure and temperature are held for about 5 to 15 minutes and then shut off and the laminated structure 10 B is cooled while maintaining pressure. When the stack is cool, the pressure is removed and the laminated structure 10 B is removed from the press apparatus 92 .
- step 118 the laminated structure 10 B is cooled to an ambient temperature.
- step 119 the foil sheets 34 A, 34 B, the blotter pads 60 A, 60 B, and the plates 50 A- 50 F are removed from the laminated structure, and the stack 12 B and the attached layers 18 F and 18 G are removed from the press apparatus 92 .
- a drill bit 20 drills the hole 102 through the stack 12 B and the layers 18 F and 18 G, as illustrated in FIG. 5 .
- step 122 the stack 12 B and the layers 18 F and 18 G are dipped into a liquid solution 132 to dissolve the fructose.
- the liquid solution 132 may include an ethylene glycol/water mixture.
- step 124 the removable adhesive is heated in the liquid solution 132 temperature of about 130° C. to about 150° C. for about 5 minutes to melt the removable adhesive 16 .
- step 126 the sheets 14 are separated from each other using any suitable device, such as tweezers, clamping devices, etc.
- each sheet 14 is rinsed with any suitable liquid, such as, distilled water and/or a mild detergent solution.
- each sheet 14 is dried using a gas, such as hot dry air.
- the sheets 14 may be separated by placing the stack 12 B in a steam autoclave 134 . In the steam autoclave 134 , pressurized steam is driven between each sheet 14 . The sheets 14 are then separated, rinsed in water and dried.
- FIG. 6 illustrates a plan view of the sheet 14 having formed a burr free hole 102 .
- the removable adhesive 16 A- 16 K may comprise a thin layer of water.
- the surface tension of the thin layer of water between each sheet 14 A- 14 L of the laminated structure 10 A holds the laminated structure 10 A together while the hole 102 is drilled.
- Each sheet 14 A- 14 L is peeled off the laminated structure 10 A and rinsed in additional water to remove any material particles. Then, each sheet 14 A- 14 L is dried. Accordingly, the appended claims are intended to encompass all such modifications and changes as fall within the true spirit and scope of this invention.
Abstract
Description
- This application is a continuation application claiming priority to Ser. No. 10/691,882, filed Oct. 23, 2003; which is a divisional of U.S. Pat. No. 6,669,805, issued Dec. 30, 2003.
- 1. Technical Field
- The present invention relates to a method of temporarily adhering a stack of sheets together to facilitate drilling a hole through the stack of sheets.
- 2. Related Art
- A stack of sheets may be adhered together around a periphery of each sheet using an adhesive such as a glass cloth impregnated with epoxy. Hole burring occurs as a drill passes through the stack. Additionally, each sheet separates from an adjacent sheet as the drill passes between the sheets. This results in the whole stack of sheets expanding. An alternate method includes the permanent application of cured epoxy over the entire surface of each sheet in the stack. The thickness of the epoxy between each sheet results in excessive thickness of the overall stack as well as composites which will contain the separated sheets when they are processed into composites. A method of drilling a stack of sheets that overcomes these problems plus others is desired.
- A first general aspect of the present invention provides a structure comprising:
- a stack comprising a plurality of sheets such that each successive sheet is coupled with a removable adhesive between each sheet; and
- an opening extending through the plurality of sheets within the stack.
- A second general aspect of the present invention provides a structure comprising:
- a plurality of stacks wherein each successive stack is coupled with a removable adhesive to an intermediate layer between each stack wherein each intermediate layer prevents burr formation; and
- wherein each stack comprises a plurality of sheets such that each successive sheet is coupled with a removable adhesive between each sheet.
- A third general aspect of the present invention provides a method comprising:
- forming a stack by stacking a plurality of sheets;
- applying an adhesive between each successive sheet;
- applying a vacuum to the plurality of sheets;
- heating the plurality of sheets to melt the solid adhesive;
- applying a first pressure to the sheets;
- cooling the plurality of sheets; and
- forming an opening through the plurality of sheets; and
- separating the sheets.
- A forth general aspect of the present invention provides a method comprising:
- forming a stack by stacking a plurality of sheets;
- applying a thin layer of water between each successive sheet;
- applying a pressure to the sheets; and
- forming an opening through the plurality of sheets.
- For an understanding of the present invention, reference should be made to the following detailed description taken in connection with the accompanying drawings wherein:
-
FIG. 1 illustrates a first embodiment of the present invention including a side view of a laminated structure including a stack comprising a plurality of sheets including a removable adhesive between each sheet; -
FIG. 2 illustrates a second embodiment of the present invention including a side view of a laminated structure including a plurality of stacks including a plurality of layers separating each stack; -
FIG. 3 illustrates a third embodiment of the present invention including an exploded side view of another embodiment of a laminated structure including a plurality of blotter sheets and a plurality plates added to a stack; -
FIG. 4 illustrates the laminated structure ofFIG. 3 positioned within a press apparatus for forming a rigid stack; -
FIG. 5 illustrates the rigid stack ofFIG. 4 with a burr free hole drilled through each sheet of the stack; -
FIG. 6 illustrates a plan view of a hole within a sheet of the stack; and -
FIG. 7 illustrates a flow chart of a method for producing a burr free hole in each sheet of the stack. -
FIG. 1 illustrates a schematic view of a laminatedstructure 10 including astack 12 in accordance with a first embodiment. Thestack 12 includes a plurality ofsheets 14A-14L. Aremovable adhesive 16A-16K is applied between eachsheet 14A-14L, respectively. Thesheets 14A-14L may comprise any suitable material (e.g., copper, invar, copper-invar-copper, etc.). Invar is an iron-nickel alloy. The removable adhesive 16A-16K may comprise any suitable material (e.g., fructose, sucrose, water soluble polymers, water, etc.). The material may comprise any suitable form (e.g., powered fructose, a liquid, a liquid solution, etc.). -
FIG. 2 illustrates a laminatedstructure 10A including astack 12A in accordance with a second embodiment. Thestack 12A includes a plurality ofstacks layers 18A-18E. Eachstack sheets 14 with removable adhesive placed between eachsheet 14. Also, theremovable adhesive 16 is placed between eachlayer 18A-18E and eachadjacent sheet 14. Eachlayer drill bit flutes 21 by providing an interruption in thesheet 14 being drilled. Eachlayer 18A-18E comprises any suitable soft material (e.g., impregnated and laminated epoxy/glass, phenolic/paper laminate, aluminum, etc.). The formation chips are broken off each time thedrill bit 20 passes from one material to a dissimilar material. For example, if eachsheet 14 is copper, and eachlayer 18A-18E is (aluminum or paper/phenolic), then any tendency for chip build up would be interrupted each time thedrill bit 20 passes from copper to (aluminum or paper/phenolic), or from (aluminum or paper/phenolic) to copper. Additionally, thefirst layer 18A keeps the drill bit from wandering as it enters thestack 12A of the laminatedstructure 10A. A soft material, such as aluminum, assists thedrill bit 20 in starting ahole 102 at a desired location without wandering about atop surface 22 of thelayer 18A. -
FIG. 3 illustrates a laminatedstructure 10B including astack 12B in accordance with a third embodiment. Thestack 12B includes a plurality ofsheets 14. Theremovable adhesive 16 is applied between eachsheet 14. Thestack 12B includes afirst surface 24 and asecond surface 26. Afirst surface 28A of afirst layer 18F is coupled with the removable adhesive 16 to thefirst surface 24 of thestack 12B. Afirst surface 30A of asecond layer 18G is coupled with the removable adhesive 16 to thesecond surface 26 of thestack 12B. Afirst surface 32A of afirst foil 34A contacts asecond surface 28B of thefirst layer 18F. Afirst surface 36A of asecond foil 34B contacts asecond surface 30B of thesecond layer 18G. - A
first surface 38A of afirst plate 50A contacts asecond surface 32B of thefirst foil 34A. Afirst surface 40A of asecond plate 50B contacts asecond surface 36B of thesecond foil 34B. Afirst surface 42A of athird plate 50C contacts asecond surface 38B of thefirst plate 50A. Afirst surface 44A of afourth plate 50D contacts asecond surface 40B of the second plate SOB. Theplates 50A-50D may include any suitable material, such as stainless steel. - The
laminated structure 10B includes afirst blotter pad 60A and asecond blotter pad 60B. Thefirst blotter pad 60A includes at least oneblotter sheet 62, and thesecond blotter pad 60B includes at least oneblotter sheet 62. Theblotter sheets 62 may include any suitable compressible material, such as paper. Theblotter pads pressure surfaces FIG. 4 ) and thestack 12B, so that a uniform pressure is applied to thestack 12B. - A
first surface 64A of thefirst blotter pad 60A contacts asecond surface 42B of thethird plate 50C. Afirst surface 66A of thesecond blotter pad 60B contacts asecond surface 44B of thefourth plate 50D. A second surface 64B of thefirst blotter pad 60A contacts afirst surface 66A of afifth plate 50E. Asecond surface 66B of thesecond blotter pad 60B contacts afirst surface 68A of asixth plate 50F. Theplates -
FIG. 4 illustrates thelaminated structure 10B ofFIG. 3 positioned within apress apparatus 92. Thepress apparatus 92 includes a first pressure head 94A, asecond pressure head 94B, avacuum source 96, and aheat source 98. The first pressure head 94A and thesecond pressure head 94B provide acompressive force 100 to thelaminated structure 10B. Asecond surface 66B of thefifth plate 50E contacts thepressure surface 90A of the first pressure head 94A. Asecond surface 68B of thesixth plate 50F contacts thepressure surface 90B of thesecond pressure head 94B. -
FIG. 7 illustrates a flow chart of a method for producing a burrfree hole 102 in eachsheet 14 of thestack 12B (FIGS. 5 and 6 ). Step 104 includes stacking a plurality ofsheets 14 to form thestack 12B. Step 106 includes applying a removable adhesive 16 between eachsuccessive sheet 14 in thestack 12B. Step 108 includes applying the removable adhesive 16 between thefirst layer 18F and thefirst surface 24 of thestack 12B. As mentioned above, the removable adhesive 16 may comprise any suitable material (e.g., fructose, sucrose, water soluble polymers, water, water solutions, etc.). The following example describes using the removable adhesive 16 in the form of solid powered fructose. Step 110 includes applying the removable adhesive 16 between thesecond layer 18G and thesecond surface 26 of thestack 12B. Step 111 includes forming thelaminated structure 10B by applying thefoil sheets blotter pads stack 12B, as illustrated inFIG. 7 . Step 112 includes applying a vacuum to thelaminated structure 10B using thevacuum source 96. Step 114 includes heating thelaminated structure 10B to melt theremovable adhesive 16. - Step 116 includes applying the
compressive force 100 to thelaminated structure 10B. For fructose, theheat source 98 provides a temperature of about 50° C. to 200° C. and a firstcompressive force 100 applied to thelaminated structure 10B creates a pressure of about 25 to 75 psig. After about 10 to 20 minutes, the fructose particles start to soften, and the pressure is increased to about 200 to 400 psig. The increase in pressure is delayed to ensure that every fructose particle has been softened to prevent denting of thesheets 14. The pressure and temperature are held for about 5 to 15 minutes and then shut off and thelaminated structure 10B is cooled while maintaining pressure. When the stack is cool, the pressure is removed and thelaminated structure 10B is removed from thepress apparatus 92. - In
step 118, thelaminated structure 10B is cooled to an ambient temperature. Instep 119, thefoil sheets blotter pads plates 50A-50F are removed from the laminated structure, and thestack 12B and the attachedlayers press apparatus 92. Instep 120, adrill bit 20 drills thehole 102 through thestack 12B and thelayers FIG. 5 . Instep 122, thestack 12B and thelayers liquid solution 132 to dissolve the fructose. For fructose, theliquid solution 132 may include an ethylene glycol/water mixture. Instep 124 the removable adhesive is heated in theliquid solution 132 temperature of about 130° C. to about 150° C. for about 5 minutes to melt theremovable adhesive 16. Instep 126, thesheets 14 are separated from each other using any suitable device, such as tweezers, clamping devices, etc. Instep 128, eachsheet 14 is rinsed with any suitable liquid, such as, distilled water and/or a mild detergent solution. Instep 130 eachsheet 14 is dried using a gas, such as hot dry air. Alternatively, thesheets 14 may be separated by placing thestack 12B in asteam autoclave 134. In thesteam autoclave 134, pressurized steam is driven between eachsheet 14. Thesheets 14 are then separated, rinsed in water and dried.FIG. 6 illustrates a plan view of thesheet 14 having formed a burrfree hole 102. - While embodiments of the present invention have been described herein for purposes of illustration, many modifications and changes will become apparent to those skilled in the art. For example, the removable adhesive 16A-16K may comprise a thin layer of water. The surface tension of the thin layer of water between each
sheet 14A-14L of thelaminated structure 10A holds thelaminated structure 10A together while thehole 102 is drilled. Eachsheet 14A-14L is peeled off thelaminated structure 10A and rinsed in additional water to remove any material particles. Then, eachsheet 14A-14L is dried. Accordingly, the appended claims are intended to encompass all such modifications and changes as fall within the true spirit and scope of this invention.
Claims (20)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/866,629 US20080032155A1 (en) | 2001-02-16 | 2007-10-03 | Drill stack formation |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/788,081 US6669805B2 (en) | 2001-02-16 | 2001-02-16 | Drill stack formation |
US10/691,882 US7329446B2 (en) | 2001-02-16 | 2003-10-23 | Drill stack formation |
US11/866,629 US20080032155A1 (en) | 2001-02-16 | 2007-10-03 | Drill stack formation |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/691,882 Continuation US7329446B2 (en) | 2001-02-16 | 2003-10-23 | Drill stack formation |
Publications (1)
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US20080032155A1 true US20080032155A1 (en) | 2008-02-07 |
Family
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Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
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US09/788,081 Expired - Fee Related US6669805B2 (en) | 2001-02-16 | 2001-02-16 | Drill stack formation |
US10/691,882 Expired - Fee Related US7329446B2 (en) | 2001-02-16 | 2003-10-23 | Drill stack formation |
US11/866,629 Abandoned US20080032155A1 (en) | 2001-02-16 | 2007-10-03 | Drill stack formation |
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Application Number | Title | Priority Date | Filing Date |
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US09/788,081 Expired - Fee Related US6669805B2 (en) | 2001-02-16 | 2001-02-16 | Drill stack formation |
US10/691,882 Expired - Fee Related US7329446B2 (en) | 2001-02-16 | 2003-10-23 | Drill stack formation |
Country Status (1)
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US (3) | US6669805B2 (en) |
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US20050031547A1 (en) * | 2003-08-04 | 2005-02-10 | Foamix Ltd. | Oleaginous pharmaceutical and cosmetic foam |
CN110899985A (en) * | 2019-12-30 | 2020-03-24 | 江苏罡阳股份有限公司 | Laser removing device and method for processing burrs on intersecting surface of deep hole |
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Also Published As
Publication number | Publication date |
---|---|
US6669805B2 (en) | 2003-12-30 |
US20040086741A1 (en) | 2004-05-06 |
US7329446B2 (en) | 2008-02-12 |
US20030022013A1 (en) | 2003-01-30 |
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