US20190224740A1 - Forging device - Google Patents
Forging device Download PDFInfo
- Publication number
- US20190224740A1 US20190224740A1 US16/306,806 US201716306806A US2019224740A1 US 20190224740 A1 US20190224740 A1 US 20190224740A1 US 201716306806 A US201716306806 A US 201716306806A US 2019224740 A1 US2019224740 A1 US 2019224740A1
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- molding
- punch
- peripheral side
- molding hole
- tip end
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- 238000005242 forging Methods 0.000 title claims abstract description 134
- 238000000465 moulding Methods 0.000 claims abstract description 242
- 230000002093 peripheral effect Effects 0.000 claims abstract description 101
- 238000013459 approach Methods 0.000 claims abstract description 13
- 238000003825 pressing Methods 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 60
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 description 42
- 239000002184 metal Substances 0.000 description 42
- 238000000034 method Methods 0.000 description 12
- 230000000977 initiatory effect Effects 0.000 description 10
- 230000008569 process Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000011112 process operation Methods 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 238000010273 cold forging Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
- B21J5/022—Open die forging
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/06—Making sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/18—Making uncoated products by impact extrusion
- B21C23/183—Making uncoated products by impact extrusion by forward extrusion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
- B21J13/025—Dies with parts moving along auxiliary lateral directions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/12—Forming profiles on internal or external surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J9/00—Forging presses
- B21J9/02—Special design or construction
- B21J9/022—Special design or construction multi-stage forging presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K23/00—Making other articles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
- F28F3/022—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being wires or pins
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
- F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
- F28F3/048—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of ribs integral with the element or local variations in thickness of the element, e.g. grooves, microchannels
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/48—Manufacture or treatment of parts, e.g. containers, prior to assembly of the devices, using processes not provided for in a single one of the subgroups H01L21/06 - H01L21/326
- H01L21/4814—Conductive parts
- H01L21/4871—Bases, plates or heatsinks
- H01L21/4878—Mechanical treatment, e.g. deforming
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
- H01L23/367—Cooling facilitated by shape of device
- H01L23/3677—Wire-like or pin-like cooling fins or heat sinks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
- F28F2255/08—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes pressed; stamped; deep-drawn
Definitions
- the present invention relates to a forging device, a forging method, and a production method of a forged product for producing a forged product in which a plurality of protrusions, such as, e.g., fins, is formed on a base plate.
- a forging device for molding a heat sink is provided with a die (lower die) and a punch (upper die), and for example, a number of fin molding cavities for molding fins are formed in the bottom surface of the molding hole of the die.
- a punch is driven into a molding hole of a die in which a forging material is set, the forging material is pressurized and plastically flows, so the metallic material (metal) as a forging material is filled in the fin molding cavities and fins are molded.
- the metal is also filled in the burr molding portion between the molding hole inner peripheral side surface of the die and the outer peripheral side surface of the punch, and burrs are molded.
- a base plate is molded by the metal present in the base plate molding portion between the molding hole bottom surface of the die and the pressing surface of the punch.
- Patent Document 1 Japanese Unexamined Patent Application Publication No. 2015-50318
- the metal is split by a split flow forging effect into a metal flowing inward and a metal flowing outward.
- the metal flowing inward flows into the fin molding cavities of the inner peripheral portion, while the metal flowing outward flows into the fin molding cavities of the outer peripheral portion and the burr molding portion.
- metal flow metal flow
- the flow amount of the metal decreases and the amount of the metal to be filled in the fin forming cavities of the outer peripheral portion becomes insufficient, which may cause a risk of causing underfill.
- Preferred embodiments of the present invention have been made in view of the above-mentioned and/or other problems in the related art.
- the preferred embodiments of the present invention can significantly improve upon existing methods and/or apparatuses.
- the present invention has been made in view of the aforementioned problems, and aims to provide a forging device, a forging method, and a production method of a forged product, capable of producing a forged product excellent in dimensional accuracy of a protrusion height, such as, e.g., a fin height, and also capable of making the base plate thin to reduce in size and weight.
- a protrusion height such as, e.g., a fin height
- the present invention provides the following means.
- a forging device for producing a forged product in which a protrusion is formed on a base plate comprising:
- a protrusion molding cavity is formed in at least one of a bottom surface of the molding hole of the die and a tip end surface of the punch
- a base plate molding portion is formed between the tip end surface of the punch and the bottom surface of the molding hole
- a burr molding portion is formed between a tip end portion outer peripheral side surface of the punch and an inner peripheral side surface of the molding hole
- the inner peripheral side surface of the molding hole is formed by an inclined surface which is inclined with respect to an axis and approaches the axis toward a pressing direction of the punch.
- tip end portion outer peripheral side surface of the punch is formed by an inclined surface which is inclined with respect to the axis and approaches the axis toward the pressing direction of the punch, and
- an inclination angle of the end portion outer peripheral side surface of the punch with respect to the axis is formed to be equal to or less than an inclination angle of the inner peripheral side surface of the molding hole with respect to the axis.
- a chamfered portion is formed at an external corner portion between the tip end portion outer peripheral side surface and the tip end surface of the punch.
- an external corner portion between the tip end portion outer peripheral side surface and the tip end surface of the punch is arranged at a position closer to the axis than the internal corner portion between the inner peripheral side surface and the bottom surface of the molding hole.
- the protrusion molding cavity is constituted by a fin molding cavity for molding a fin of a heat sink.
- a forging method for producing a forged product in which a protrusion is formed on a base plate comprising:
- a protrusion is formed by a protrusion molding cavity formed on at least one of a bottom surface of the molding hole of the die and a tip end surface of the punch,
- a base plate is molded by a base plate molding portion formed between the tip end surface of the punch and the bottom surface of the molding hole, and
- a burr is formed by a burr molding portion formed between a tip end portion outer peripheral side surface of the punch and the inner peripheral side surface of the molding hole.
- a production method of a forged product for producing a forged product in which a protrusion is formed on a base plate comprising:
- a protrusion is formed by a protrusion molding cavity formed on at least one of a bottom surface of the molding hole of the die and a tip end surface of the punch,
- a base plate is molded by a base plate molding portion formed between a tip end surface of the punch and the bottom surface of the molding hole, and
- a burr is formed by a burr molding portion formed between a tip end portion outer peripheral side surface of the punch and the inner peripheral side surface of the molding hole.
- the molding hole inner peripheral side surface of the die is formed in an inclined surface that approaches the axis toward the pressing direction of the punch. Therefore, as the punch is moved downward in accordance with the progress of the molding, the width of the burr molding portion inlet on the way from the base plate molding portion to the burr molding portion gradually narrows. Therefore, at the initial stage of pressurization, since the width of the burr molding portion inlet is wide, the metal flowing outward due to the split flow forging effect preferentially flows to the burr molding portion, so that the vertical dimension (thickness) of the base plate molding portion can be formed as thin as desired.
- the width of the burr molding portion inlet becomes narrow and therefore the flow of the metal to the burr molding portion is suppressed.
- the metal is fully filled in all of the protrusion molding cavities of the outer peripheral portion.
- the base plate of the forged product can be made thin, and the forged product can be reduced in weight and size.
- the height accuracy of the protrusion can be improved, so a high quality forged product can be produced.
- the molding hole inner peripheral surface is formed in the inclined surface, the releasability when discharging the forged roughly shaped material from the molding hole can be improved, enabling a smooth forging process operation, which in turn can improve the production efficiency.
- the forging device of the invention since the chamfered portion is formed at the internal corner portion of the molding hole in the die, it is possible to avoid concentration of the stress on the internal corner portion of the die at the time of molding. Thus, occurrence of cracks, etc., of the internal corner portion can be effectively prevented, which can improve the die life. This in turn can improve the durability. Further, during the molding, the metal from the base plate molding portion to the burr molding portion can flow smoothly, so that the punch load can be reduced correspondingly, and therefore the device itself can be reduced in size.
- the tip end portion outer peripheral side surface of the punch is formed in an inclined surface that approaches the axis toward the pressing direction, it is possible to improve the releasability at the time of separating the punch from the forged roughly shaped material.
- the forging process operation can be carried out more smoothly, so that the production efficiency can be further improved.
- the forging device of the invention since the chamfered portion is formed at the external corner portion of the punch, it is possible to avoid concentration of the stress during molding on the external corner portion of the punch. Thus, occurrence of cracks, etc., of the external corner portion can be prevented effectively, which can improve the die life. This in turn can further improve the durability. Further, during the molding, the metal can more smoothly flow from the base plate molding portion to the burr molding portion, so that the punch load can be reduced correspondingly, and the device itself can be more assuredly reduced in size.
- the forging device of the invention since the external corner portion of the punch is arranged inner than the internal corner portion of the molding hole, it is possible to more assuredly prevent the external corner portion of the punch from coming into contact with the inner peripheral side surface of the molding hole, which in turn can more assuredly prevent breakage, etc., of the due to the contact.
- FIG. 1A is a cross-sectional view showing a state immediately before initiation of molding in a forging device according to a first embodiment of the present invention.
- FIG. 1B is a cross-sectional view showing a state immediately after initiation of pressurization in a forging device according to the first embodiment.
- FIG. 1C is a cross-sectional view showing a state immediately before completion of pressurization in the forging device of the first embodiment.
- FIG. 1D is a cross-sectional view showing a state immediately after initiation of punch rising in the forging device of the first embodiment.
- FIG. 1E is a cross-sectional view showing a state immediately after discharge initiation of a forged roughly shaped material in the first embodiment forging device.
- FIG. 2 is a perspective view showing a heat sink produced based on a forging device of the first embodiment.
- FIG. 3A is a cross-sectional view showing a state immediately before initiation of molding in a forging device according to a second embodiment of the present invention.
- FIG. 3B is a cross-sectional view showing a state immediately before completion of pressurization in the forging device of the second embodiment.
- FIG. 4A is a cross-sectional view showing a state immediately before completion of pressurization in a forging device according to a third embodiment of the present invention.
- FIG. 4B is a cross-sectional view showing a state immediately after initiation of punch rising in the forging device of the third embodiment.
- FIG. 5A is a cross-sectional view showing a state immediately before completion of pressurization in a conventional forging device.
- FIG. 5B is a cross-sectional view showing a state immediately after initiation of punch rising in a conventional embodiment forging device.
- FIG. 5C is a cross-sectional view showing a state immediately after discharge initiation of a forged roughly shaped material in a conventional forging device.
- FIG. 1A to FIG. 1E are cross-sectional views showing one side half of a die of a forging device according to a first embodiment of the present invention.
- a forging material W is die-forged in a semi-sealed manner to form a heat sink as a forged product.
- FIG. 2 is a perspective view showing an example of a heat sink 9 produced by the forging device of the embodiment.
- the heat sink 9 is provided with a rectangular base plate 91 and a large number of fins (pin fins) 92 integrally formed on one surface of the base plate 91 .
- the forging device of this embodiment is provided with a die (lower die) 1 and a punch (upper die) 2 .
- the die 1 is provided with a molding hole 11 recessed downward on its upper surface side. On the bottom surface of this molding hole 11 , a large number of fin molding cavities 32 for forming fins 92 as protrusions are provided.
- the inner peripheral side surface 13 of the die 1 is formed in an inclined surface which is inclined with respect to the axis X and gradually approaches the axis X toward the pressing direction (downward direction) by the punch 2 , in other words, toward the inner portion of the molding hole 11 .
- the inclination angle ⁇ of the molding hole inner peripheral side surface 13 with respect to the axis X is set to 0.1° to 20°.
- the molding hole inner peripheral side surface 13 is formed in a straight line in cross-section, it is not always necessary to form it in a straight line in cross-section.
- the molding hole inner peripheral side surface is not necessarily formed in a straight shape in cross-section but may be formed in a slightly bent arc shape in cross-section or a slightly bent polygonal shape in cross-section or the like. Such cases are also included in the present invention.
- the lower end outer peripheral edge portion of the molding hole inner peripheral side surface 13 of the die 1 in other words, the entire circumference of the corner portion between the bottom surface of the molding hole 11 and the inner peripheral side surface 13 , forms an internal corner portion 14 .
- the punch 2 is arranged so that the axis thereof coincides with the axis of the die 1 , and is configured to be vertically movable up and down, so that the tip end portion of the punch 2 is driven into the molding hole 11 of the die 1 with a predetermined load.
- the tip end portion of the punch 2 denotes a portion which is to be accommodated in the molding hole 11 when the punch 2 is driven into the die 1 .
- the tip end surface outer peripheral edge portion of the punch 2 in other words, the entire circumference of the corner portion between the tip end surface of the punch 2 and the outer peripheral side surface 23 , forms the external corner portion 24 .
- a burr molding portion inlet 34 is formed between the tip end surface outer peripheral edge portion (external corner portion) 24 and the inner peripheral side surface 13 of the molding hole 11 .
- the width T of this burr molding portion inlet 34 corresponds to the horizontal dimension between the external corner portion 24 of the punch 2 and the molding hole inner peripheral side surface.
- a forging material W is put in the molding hole 11 of the die 1 .
- the forging material W those made of an aluminum alloy or a copper alloy are preferably used.
- a plate material is used as a forging material W.
- this plate material may be produced by cutting a rolled material by trimming or machining, or may be produced by cutting a flat bar shaped extrusion material or cutting a rectangular continuous cast bar.
- the forging material W is formed to have a size and a shape capable of being accommodated in the molding hole 11 of the die 1 .
- the forging material W to be input is subjected to a lubrication treatment as necessary and heated to about 400° C. to 600° C., and dies, such as, e.g., the die 1 and the punch 2 , are also subjected to a lubrication treatment as necessary and heated. Needless to say, in the case of cold forging, the forging material W and the die are not heated.
- the punch 2 is lowered to press the forging material W.
- the metallic material (metal) constituting the forging material W is divided into the metal flowing toward the center (radially inward direction) and the metal flowing toward the outer side (radially outward direction) by the split flow forging effect.
- the fin molding cavities 32 at the center portion are filled sufficiently.
- the molding hole inner peripheral side surface 13 is formed in an inclined surface, at the stage in which the tip end portion of the punch 2 immediately after initiation of the pressurization has not been completely driven into the molding hole 11 , the width T of the burr molding portion inlet 34 between the external corner portion 24 of the punch 2 and the molding hole inner peripheral side surface 13 is sufficiently wide. For this reason, a large amount of metal toward the outside smoothly flows toward the burr molding portion 33 , and therefore the metal is efficiently discharged from the base plate molding portion 31 between the punch tip end surface and the molding hole bottom surface to the burr molding portion 33 . Thus, the vertical dimension of the base plate molding portion 31 can be formed sufficiently small.
- the filling amount of the metal to the fin molding cavities 32 on the outer side is smaller than the metal filling amount of the fin molding cavities 32 at the center portion.
- the width T of the burr molding portion inlet 34 between the external corner portion 24 of the punch 2 and the molding hole inner peripheral side surface 13 gradually narrows as the punch 2 descends.
- the metal toward the outside is suppressed from flowing into the burr molding portion 33 , which promotes the inflow to the fin molding cavities 32 on the outer side.
- the fin molding cavities 32 on the outer side are also sufficiently filled with the metal, and therefore all the fin molding cavities 32 in the center and outside are sufficiently filled with the metal.
- a forged roughly shaped material for a heat sink is molded.
- a back pressure forging in which the bottom surface portion of the fin molding cavity 32 is constituted by a movable back pressure pin so that resistance (back pressure) in the direction opposite to the inflow direction is imparted to the metal flowing into the fin molding cavity 32 may be adopted.
- burrs are removed by trim processing. After that, the formed forged roughly shaped material is subjected to machining and washing as necessary and finished as a heat sink 9 as a forged product as shown in FIG. 2 .
- the forging device of this embodiment since the molding hole inner peripheral side surface 13 of the die 1 is formed in an inclined surface that expands toward upward, as the punch 2 descends as the forming progresses, the width T of the burr molding portion inlet 34 on the way from the base plate molding portion 31 to the burr molding portion 33 gradually narrows. For this reason, at the initial stage of pressurization, the metal flows preferentially to the fin molding cavities 32 at the center portion and the burr molding portion 33 , so it is possible to form the vertical dimension (thickness) of the base plate molding portion 31 as thin as desired.
- the width T of the burr molding portion inlet 34 narrows, so that the flow of the metal toward the burr molding portion 33 is suppressed. For this reason, the metal is sufficiently filled also in the fin molding cavities 32 at the outer peripheral portion, so that the metal is sufficiently filled in all of the fin molding cavities 32 , which can effectively prevent occurrence of underfill.
- all fin heights of the heat sink 9 as a forged product can be precisely matched, and a high quality forged product can be produced.
- the thickness of the base plate molding portion 31 can be made thin, the base plate 91 of the heat sink 9 as a forged product can be formed thin, so that the heat sink 9 can be reduced in weight and size.
- the molding hole inner peripheral side surface 13 of the die 1 is formed in an inclined surface, it is possible to reduce the load (forging load) by the punch 2 .
- the inner peripheral side surface 13 of the molding hole 11 of the die 1 and the outer peripheral side surface 23 of the punch 2 are both formed by vertical planes, and the width of the burr molding portion 33 constituted by and between these side surfaces 13 and 23 is formed constant regardless of the vertical position. Therefore, the metal flowing from the base plate molding portion 31 into the burr molding portion 33 is filled into the burr molding portion 33 while being in surface contact with the molding hole inner peripheral side surface 13 and the punch outer peripheral side surface 23 . For this reason, the flow resistance of the metal flowing through the burr molding portion 33 increases, so that it is necessary to increase the punch load accordingly. As a result, it is necessary to enlarge the press machine, which may cause an increased weight of the forging device.
- the molding hole inner peripheral side surface 13 is formed in an inclined surface. Therefore, the metal flowing from the base plate molding portion 31 to the burr molding portion 33 only makes line contact with the external corner portion 24 of the punch 2 and is hardly subjected to the surface contact resistance to the molding hole inner peripheral side surface 13 and the punch outer peripheral side surface 23 . Therefore, the flow resistance of the metal flowing through the burr molding portion 33 decreases, and the punch load can be reduced accordingly. As a result, it is possible to reduce the size and weight of the forging device itself, and it is possible to produce a large forged product large in projection area with a small compact machine of a press machine.
- the flow resistance of the metal flowing through the burr molding portion 33 is small, it is possible to increase the discharge amount of the metal from the base plate molding portion 31 to the burr molding portion 33 , which in turn can assuredly reduce the thickness of the base plate molding portion 31 .
- the thickness of the base plate 91 in the forged product can be more assuredly formed to be thin.
- the contact area and the contact pressure between the burr W 3 of the forged roughly shaped material and the punch outer peripheral side surface 23 are smaller than those of the conventional forging device shown in FIG. 5A . Therefore, as shown in FIG. 1D , when raising the punch 2 after pressurization, the releasability of the punch 2 with respect to the forged roughly shaped material (burr W 3 ) is good, enabling the smooth forging process operation, which can improve the productivity.
- the molding hole inner peripheral side surface 13 is formed vertically. For this reason, it is difficult to discharge the forged roughly shaped material from the molding hole 11 due to the influence of the contact resistance of the burr W 3 to the molding hole inner peripheral side surface 13 at the time of pushing out the forged roughly shaped material from the molding hole 11 after molding. In some cases, harmful deformation such as bending deformation may occur in the forged roughly shaped material. From this point as well, the forging process operation cannot be performed smoothly, which may sometimes cause deterioration of the productivity.
- the molding hole inner peripheral side surface 13 is formed in an inclined surface. For this reason, when the forged roughly shaped material is slightly raised after molding, the contact resistance of the burr W 3 to the molding hole inner peripheral side surface 13 disappears. Therefore, the forged roughly shaped material can be discharged from the molding hole 11 without difficulty, which can assuredly prevent occurrence of harmful bending deformation, etc., and also can perform the forging process more smoothly. Thus, the productivity can be further improved.
- a forging device similar to the forging device of the first embodiment shown in FIG. 1A to FIG. 1E was prepared.
- a die 1 and a punch 2 were prepared under the conditions of producing a heat sink in which columnar pin fins 92 each having a pin diameter ⁇ of 2.2 mm and a height of 10 mm were formed in a staggered arrangement manner on one surface side of the base plate 91 , a distance (distance between pin outer diameters) between adjacent pin fins 92 was 0.9 mm, the number of pins was 13 ⁇ 40, a total of 520.
- a die 1 was prepared in which the inclination angle ⁇ of the molding hole inner peripheral side surface 13 was 10°. Note that the tip end portion outer peripheral side surface 23 of the punch 2 was a vertical plane with an inclination angle of 0°.
- a 1 , 000 series aluminum alloy was prepared.
- this material W a material formed by cutting an extrusion material (flat bar) with a width of 50 mm ⁇ a thickness of 4 mm was cut into 80 mm was prepared. The material W has been adjusted to fit the molding hole 11 of the die 1 .
- the dies, such as the die 1 and the punch 2 , of the forging device was heated to 200° C. or higher, lubricant was directly sprayed onto the dies immediately before forging process, and then the forging material W was put in a molding hole 11 of the die 1 .
- the forging material W which was pre-heated to 500° C. without performing a lubrication treatment was used.
- the forging material W in the forging device was set in the same manner as in the first embodiment to produce the forged product (heat sink) of an example.
- the thickness of the base plate 91 was made as thin as about 0.3 mm.
- the variation in the pin height could be controlled to 0.5 mm or less, and the pin heights could be matched without problems.
- defects, such as bent deformation which is harmful to the forged product were not particularly recognized.
- a forging device similar to the conventional forging device shown in FIG. 5A to FIG. 5C was used, that is, except that a forging device in which the molding hole inner peripheral side surface 13 of the die 1 is a vertical plane of an inclination angle 0° was used, a forged product (heat sink) was produced in the same manner as in the aforementioned example.
- the thickness of the base plate 91 could not be controlled to 1 mm or less, and the variation in the pin height was also 0.5 mm or more, so that the pin heights could not be aligned.
- some forged roughly shaped materials had harmful bending deformation.
- the thickness of the base plate 91 could be made thin, and a high quality heat sink 9 with matched pin heights could be manufactured.
- FIG. 3A and FIG. 3B are cross-sectional views each showing a forging device according to a second embodiment of the present invention.
- a chamfered portion 15 is formed at the internal corner portion 14 of the lower end of the molding hole in the die 1 .
- the chamfered portion 15 is constituted by an R-plane.
- a chamfered portion 25 is formed at the external corner portion 24 of the tip end surface outer peripheral edge portion of the punch 2 .
- the chamfered portion 25 is constituted by an R-plane.
- the chamfered portions 15 and 25 are formed at the internal corner portion 14 of the molding hole lower end outer peripheral edge portion of the die 1 and the external corner portion 24 of the tip end surface outer peripheral edge portion of the punch 2 , respectively. Therefore, the internal corner portion 14 and the external corner portion 24 each are not formed in a sharp edge shape, so the durability can be improved. That is, if the internal corner portion 14 of the die 1 and the external corner portion 24 of the punch 2 each are formed into a sharp edge, stress concentrates on the internal corner portion 14 and the external corner portion 24 when the punch 2 is driven. In such a case, cracks tend to occur in the internal corner portion 14 of the die 1 and the external corner portion 24 of the punch 2 , so that the die life becomes short and the durability may deteriorate.
- the chamfered portions 15 and 25 are formed in the internal corner portion 14 of the die 1 and the external corner portion 24 of the punch 2 , respectively, the internal corner portion 14 and the external corner portion 24 each have a smooth shape, so it is possible to prevent local concentration of the stress on the internal corner portion 14 and the external corner portion 24 at the time of driving the punch. For this reason, it is possible to effectively prevent occurrence of cracks in the internal corner portion 14 of the die 1 , the external corner portion 24 of the punch 2 , etc., so that the die life can be extended and the durability can be improved.
- the burr molding portion inflow passage from the base plate molding portion 31 to the burr molding portion inlet 34 is formed by a gently curved circular arc flow passage rather than a bent flow passage that rapidly changes in direction. For this reason, the flow of the metal from the base plate molding portion 31 to the burr molding portion 33 can be performed smoothly during the molding, which can further reduce the punch load. This in turn can further miniaturize the forging device.
- the chamfered portions 15 and 25 of the internal corner portion 14 of the molding hole 11 and the external corner portion 24 of the punch 2 are formed by an R-plane, but the present invention is not limited to this.
- the internal corner portion 14 and the external corner portion 24 may be each formed by a C-plane or multiple planes.
- FIG. 4A and FIG. 4B are cross-sectional views each showing a forging device according to a third embodiment of the present invention.
- the tip end portion outer peripheral side surface 23 of the punch 2 is formed in an inclined surface which is inclined with respect to the axis X and gradually approaches the axis X toward the pressing direction (downward direction).
- the inclination angle ⁇ of the punch outer peripheral side surface 23 with respect to the axis X is set to 0.1° to 20°.
- the inclination angle ⁇ of the punch outer peripheral surface 23 is equal to or smaller than the inclination angle ⁇ of the molding hole inner peripheral side surface 13 shown in FIG. 1A .
- the punch outer peripheral side surface 23 is formed in a straight line in cross-section, it is not always necessary to form it in a straight line in cross-section.
- the punch outer peripheral side surface 23 is not necessarily formed in a straight shape in cross-section, but may be formed in a slightly bent arc shape in cross-section or a slightly bent polygonal shape in cross-section or the like. Such cases are also included in the present invention.
- the position of the tip end surface outer peripheral edge portion (external corner portion) 24 of the punch 2 is arranged at a position closer to the axis X than the position of the molding hole lower end inner peripheral edge portion (internal corner portion) 14 of the die 1 .
- the third embodiment of the forging device can also obtain the same effects as those of the aforementioned first forging device.
- the tip end portion outer peripheral side surface 23 of the punch 2 is formed in the inclined surface, as shown in FIG. 4B , at the time when the punch 2 is raised slightly after pressurization, the contact of the punch 2 to the burr W 3 is released and the whole area is separated. For this reason, at the time of rising the punch 2 , the punch 2 can be separated without difficulty from the forged roughly shaped material, enabling a more smooth forging process operation, which further can improve the production efficiency.
- the external corner portion 24 of the punch 2 is arranged inner than the internal corner portion 14 of the molding hole 11 , it is possible to more assuredly prevent the external corner portion 24 of the punch 2 from coming into contact with the inner peripheral side surface of the molding hole 11 of the die 1 , which in turn can more assuredly prevent breakage of the due to the contact.
- fin molding cavities 32 are formed on the die 1 side
- the present invention is not limited thereto.
- fin molding cavities may be formed on the punch side, or a heat sink (forged product) in which fins are formed on both surfaces of the base plate may be formed by forming fin molding cavities on both the die side and the punch side.
- the present invention is not limited thereto.
- the present invention can also be applied to the case of forming a heat sink having plate fins formed on one or both sides of the heat sink.
- the present invention is not limited to such a heat sink.
- the present invention can be adopted in the case of producing a forged product in which a plurality of protrusions is formed on at least one surface of a base plate.
- the position of the external corner portion 24 of the punch 2 from the axis X is set to be equal to or inner than the position of the internal corner portion 14 of the die molding hole 11 from the axis X, in other words, the horizontal distance of the external corner portion 24 of the punch 2 from the axis X is set to be equal to or shorter than the horizontal distance of the internal corner portion 14 of the die molding hole 11 from the axis X.
- the present invention is not limited to it, and the position of the punch external corner portion 24 may be arranged outside the die molding hole internal corner portion 14 .
- the term “preferably” is non-exclusive and means “preferably, but not limited to.”
- means-plus-function or step-plus-function limitations will only be employed where for a specific claim limitation all of the following conditions are present in that limitation: a) “means for” or “step for” is expressly recited; b) a corresponding function is expressly recited; and c) structure, material or acts that support that structure are not recited.
- the terminology “present invention” or “invention” may be used as a reference to one or more aspect within the present disclosure.
- the forging device of the present invention can be suitably applied in manufacturing a forged product, such as, e.g., a heat sink in which a large number of fins are formed on a base plate.
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Abstract
A forging device produces a forged product in which a protrusion is formed on a base plate. The forging device has a die with a molding hole and a punch to be driven into the molding hole. A protrusion molding cavity is formed in a bottom surface of the molding hole or a tip end surface of the punch in the die. A base plate molding portion is formed between the tip end surface of the punch and the bottom surface of the molding hole. A burr molding portion is formed between the tip end portion outer peripheral side surface of the punch and the inner peripheral side surface of the molding hole. The inner peripheral side surface of the molding hole is formed by an inclined surface that approaches an axis as it advances toward the pressing direction of the punch.
Description
- The present invention relates to a forging device, a forging method, and a production method of a forged product for producing a forged product in which a plurality of protrusions, such as, e.g., fins, is formed on a base plate.
- In the case of producing a heat sink having a large number of fins formed on a front surface or a rear surface of a base plate by die forging, for example, a semi-sealed forging device (dies) as shown in
Patent Document 1 is used. - A forging device for molding a heat sink is provided with a die (lower die) and a punch (upper die), and for example, a number of fin molding cavities for molding fins are formed in the bottom surface of the molding hole of the die. When a punch is driven into a molding hole of a die in which a forging material is set, the forging material is pressurized and plastically flows, so the metallic material (metal) as a forging material is filled in the fin molding cavities and fins are molded. Further, the metal is also filled in the burr molding portion between the molding hole inner peripheral side surface of the die and the outer peripheral side surface of the punch, and burrs are molded. Furthermore, a base plate is molded by the metal present in the base plate molding portion between the molding hole bottom surface of the die and the pressing surface of the punch.
- In the aforementioned conventional forging process, during the molding process, the metal is split by a split flow forging effect into a metal flowing inward and a metal flowing outward. The metal flowing inward flows into the fin molding cavities of the inner peripheral portion, while the metal flowing outward flows into the fin molding cavities of the outer peripheral portion and the burr molding portion. However, as a result of the analysis of the flow of the metal (metal flow), it was found the fact that at the initial stage of pressurization, the metal flowing outward will not be smoothly discharged from the base plate molding portion to the burr molding portion, which makes it difficult to reduce the height dimension (thickness) of the base plate molding portion. Furthermore, at the stage immediately before completion of the pressurization, the flow amount of the metal decreases and the amount of the metal to be filled in the fin forming cavities of the outer peripheral portion becomes insufficient, which may cause a risk of causing underfill.
- As described above, in the conventional forging process, there were problems that it was difficult to reduce the thickness of the base plate, so a lightweight and compact heat sink could not be produced. Further, the fin height of a heat sink could not be made uniform due to the underfill, so a high quality forged product (heat sink) could not be produced.
- Preferred embodiments of the present invention have been made in view of the above-mentioned and/or other problems in the related art. The preferred embodiments of the present invention can significantly improve upon existing methods and/or apparatuses.
- The present invention has been made in view of the aforementioned problems, and aims to provide a forging device, a forging method, and a production method of a forged product, capable of producing a forged product excellent in dimensional accuracy of a protrusion height, such as, e.g., a fin height, and also capable of making the base plate thin to reduce in size and weight.
- The other purposes and advantages of the present invention will be made apparent from the following preferred embodiments.
- In order to solve the aforementioned problems, the present invention provides the following means.
- [1] A forging device for producing a forged product in which a protrusion is formed on a base plate, comprising:
- a die having a molding hole; and
- a punch to be driven into the molding hole,
- wherein a protrusion molding cavity is formed in at least one of a bottom surface of the molding hole of the die and a tip end surface of the punch,
- wherein a base plate molding portion is formed between the tip end surface of the punch and the bottom surface of the molding hole,
- wherein a burr molding portion is formed between a tip end portion outer peripheral side surface of the punch and an inner peripheral side surface of the molding hole, and
- wherein the inner peripheral side surface of the molding hole is formed by an inclined surface which is inclined with respect to an axis and approaches the axis toward a pressing direction of the punch.
- [2] The forging device as recited in the aforementioned Item [1], wherein a chamfered portion is formed at an internal corner portion between the inner peripheral side surface and the bottom surface of the molding hole.
- [3] The forging device as recited in the aforementioned Item [1] or [2],
- wherein the tip end portion outer peripheral side surface of the punch is formed by an inclined surface which is inclined with respect to the axis and approaches the axis toward the pressing direction of the punch, and
- wherein an inclination angle of the end portion outer peripheral side surface of the punch with respect to the axis is formed to be equal to or less than an inclination angle of the inner peripheral side surface of the molding hole with respect to the axis.
- [4] The forging device as recited in any one of the aforementioned Items [1] to [3],
- wherein a chamfered portion is formed at an external corner portion between the tip end portion outer peripheral side surface and the tip end surface of the punch.
- [5] The forging device as recited in any one of the aforementioned Items [1] to [4],
- wherein an external corner portion between the tip end portion outer peripheral side surface and the tip end surface of the punch is arranged at a position closer to the axis than the internal corner portion between the inner peripheral side surface and the bottom surface of the molding hole.
- [6] The forging device as recited in any one of the aforementioned Items [1] to [5],
- wherein the protrusion molding cavity is constituted by a fin molding cavity for molding a fin of a heat sink.
- [7] A forging method for producing a forged product in which a protrusion is formed on a base plate, comprising:
- a step of setting a forging material in a molding hole of a die formed by an inclined surface in which an inner peripheral side surface of a molding hole is inclined with respect to an axis and approaches the axis toward an inner portion of the molding hole; and
- a step of pressurizing the forging material by driving a punch into the molding hole;
- wherein in the step of pressurizing the forging material, a protrusion is formed by a protrusion molding cavity formed on at least one of a bottom surface of the molding hole of the die and a tip end surface of the punch,
- wherein a base plate is molded by a base plate molding portion formed between the tip end surface of the punch and the bottom surface of the molding hole, and
- wherein a burr is formed by a burr molding portion formed between a tip end portion outer peripheral side surface of the punch and the inner peripheral side surface of the molding hole.
- [8] A production method of a forged product for producing a forged product in which a protrusion is formed on a base plate, comprising:
- a step of setting a forging material in a molding hole of a die formed by an inclined surface in which an inner peripheral side surface of the molding hole is inclined with respect to an axis and approaches the axis towards the inner portion of the molding hole; and
- a step of pressurizing the forging material by driving a punch into the molding hole;
- wherein in the step of pressurizing the forging material, a protrusion is formed by a protrusion molding cavity formed on at least one of a bottom surface of the molding hole of the die and a tip end surface of the punch,
- wherein a base plate is molded by a base plate molding portion formed between a tip end surface of the punch and the bottom surface of the molding hole, and
- wherein a burr is formed by a burr molding portion formed between a tip end portion outer peripheral side surface of the punch and the inner peripheral side surface of the molding hole.
- According to the forging device of the invention recited in the aforementioned Item [1], the molding hole inner peripheral side surface of the die is formed in an inclined surface that approaches the axis toward the pressing direction of the punch. Therefore, as the punch is moved downward in accordance with the progress of the molding, the width of the burr molding portion inlet on the way from the base plate molding portion to the burr molding portion gradually narrows. Therefore, at the initial stage of pressurization, since the width of the burr molding portion inlet is wide, the metal flowing outward due to the split flow forging effect preferentially flows to the burr molding portion, so that the vertical dimension (thickness) of the base plate molding portion can be formed as thin as desired. Further, at the stage of the pressurization end, the width of the burr molding portion inlet becomes narrow and therefore the flow of the metal to the burr molding portion is suppressed. As a result, the metal is fully filled in all of the protrusion molding cavities of the outer peripheral portion. Thus, it is possible to effectively prevent occurrence of underfill. In this way, the base plate of the forged product can be made thin, and the forged product can be reduced in weight and size. Further, the height accuracy of the protrusion can be improved, so a high quality forged product can be produced.
- Since the molding hole inner peripheral surface is formed in the inclined surface, the releasability when discharging the forged roughly shaped material from the molding hole can be improved, enabling a smooth forging process operation, which in turn can improve the production efficiency.
- According to the forging device of the invention recited in the aforementioned Item [2], since the chamfered portion is formed at the internal corner portion of the molding hole in the die, it is possible to avoid concentration of the stress on the internal corner portion of the die at the time of molding. Thus, occurrence of cracks, etc., of the internal corner portion can be effectively prevented, which can improve the die life. This in turn can improve the durability. Further, during the molding, the metal from the base plate molding portion to the burr molding portion can flow smoothly, so that the punch load can be reduced correspondingly, and therefore the device itself can be reduced in size.
- According to the forging device of the invention recited in the aforementioned Item [3], since the tip end portion outer peripheral side surface of the punch is formed in an inclined surface that approaches the axis toward the pressing direction, it is possible to improve the releasability at the time of separating the punch from the forged roughly shaped material. Thus, the forging process operation can be carried out more smoothly, so that the production efficiency can be further improved.
- According to the forging device of the invention recited in the aforementioned Item [4], since the chamfered portion is formed at the external corner portion of the punch, it is possible to avoid concentration of the stress during molding on the external corner portion of the punch. Thus, occurrence of cracks, etc., of the external corner portion can be prevented effectively, which can improve the die life. This in turn can further improve the durability. Further, during the molding, the metal can more smoothly flow from the base plate molding portion to the burr molding portion, so that the punch load can be reduced correspondingly, and the device itself can be more assuredly reduced in size.
- According to the forging device of the invention recited in the aforementioned Item [5], since the external corner portion of the punch is arranged inner than the internal corner portion of the molding hole, it is possible to more assuredly prevent the external corner portion of the punch from coming into contact with the inner peripheral side surface of the molding hole, which in turn can more assuredly prevent breakage, etc., of the due to the contact.
- According to the forging device of the invention recited in the aforementioned Item [6], it is possible to produce a heat sink in which a fin is formed on the base plate.
- According to the forging method of the invention recited in the aforementioned Item [7], in the same manner as described above, it is possible to produce a high quality forged product reduced in weight and size and excellent in height accuracy of the protrusion.
- According to the production method of a forged product of the invention recited in the aforementioned Item [8], in the same manner as described above, it is possible to produce a high quality forged product reduced in weight and size and excellent in height accuracy of the protrusion.
-
FIG. 1A is a cross-sectional view showing a state immediately before initiation of molding in a forging device according to a first embodiment of the present invention. -
FIG. 1B is a cross-sectional view showing a state immediately after initiation of pressurization in a forging device according to the first embodiment. -
FIG. 1C is a cross-sectional view showing a state immediately before completion of pressurization in the forging device of the first embodiment. -
FIG. 1D is a cross-sectional view showing a state immediately after initiation of punch rising in the forging device of the first embodiment. -
FIG. 1E is a cross-sectional view showing a state immediately after discharge initiation of a forged roughly shaped material in the first embodiment forging device. -
FIG. 2 is a perspective view showing a heat sink produced based on a forging device of the first embodiment. -
FIG. 3A is a cross-sectional view showing a state immediately before initiation of molding in a forging device according to a second embodiment of the present invention. -
FIG. 3B is a cross-sectional view showing a state immediately before completion of pressurization in the forging device of the second embodiment. -
FIG. 4A is a cross-sectional view showing a state immediately before completion of pressurization in a forging device according to a third embodiment of the present invention. -
FIG. 4B is a cross-sectional view showing a state immediately after initiation of punch rising in the forging device of the third embodiment. -
FIG. 5A is a cross-sectional view showing a state immediately before completion of pressurization in a conventional forging device. -
FIG. 5B is a cross-sectional view showing a state immediately after initiation of punch rising in a conventional embodiment forging device. -
FIG. 5C is a cross-sectional view showing a state immediately after discharge initiation of a forged roughly shaped material in a conventional forging device. -
FIG. 1A toFIG. 1E are cross-sectional views showing one side half of a die of a forging device according to a first embodiment of the present invention. In this embodiment, using the forging device shown in these figures, a forging material W is die-forged in a semi-sealed manner to form a heat sink as a forged product. -
FIG. 2 is a perspective view showing an example of aheat sink 9 produced by the forging device of the embodiment. As shown in the figure, theheat sink 9 is provided with arectangular base plate 91 and a large number of fins (pin fins) 92 integrally formed on one surface of thebase plate 91. - As shown in
FIG. 1A toFIG. 1E , the forging device of this embodiment is provided with a die (lower die) 1 and a punch (upper die) 2. - The
die 1 is provided with amolding hole 11 recessed downward on its upper surface side. On the bottom surface of thismolding hole 11, a large number offin molding cavities 32 for formingfins 92 as protrusions are provided. - Further, the inner
peripheral side surface 13 of thedie 1 is formed in an inclined surface which is inclined with respect to the axis X and gradually approaches the axis X toward the pressing direction (downward direction) by thepunch 2, in other words, toward the inner portion of themolding hole 11. In this embodiment, as shown inFIG. 1A , the inclination angle α of the molding hole innerperipheral side surface 13 with respect to the axis X is set to 0.1° to 20°. - In this embodiment, although the molding hole inner
peripheral side surface 13 is formed in a straight line in cross-section, it is not always necessary to form it in a straight line in cross-section. The molding hole inner peripheral side surface is not necessarily formed in a straight shape in cross-section but may be formed in a slightly bent arc shape in cross-section or a slightly bent polygonal shape in cross-section or the like. Such cases are also included in the present invention. - In this embodiment, the lower end outer peripheral edge portion of the molding hole inner
peripheral side surface 13 of thedie 1, in other words, the entire circumference of the corner portion between the bottom surface of themolding hole 11 and the innerperipheral side surface 13, forms aninternal corner portion 14. - The
punch 2 is arranged so that the axis thereof coincides with the axis of thedie 1, and is configured to be vertically movable up and down, so that the tip end portion of thepunch 2 is driven into themolding hole 11 of thedie 1 with a predetermined load. - In this embodiment, the tip end portion of the
punch 2 denotes a portion which is to be accommodated in themolding hole 11 when thepunch 2 is driven into thedie 1. - In this embodiment, the tip end surface outer peripheral edge portion of the
punch 2, in other words, the entire circumference of the corner portion between the tip end surface of thepunch 2 and the outerperipheral side surface 23, forms theexternal corner portion 24. - In the forging device having the configuration of this embodiment, as shown in
FIG. 1B ,FIG. 1C , etc., when thepunch 2 is driven into thedie 1, between the bottom surface of themolding hole 11 of thedie 1 and the tip end surface (pressurizing surface) of thepunch 2, a baseplate molding portion 31 for molding thebase plate 91 of theheat sink 9 is formed, and between the innerperipheral side surface 13 of themolding hole 11 of thedie 1 and the outerperipheral side surface 23 of thepunch 2, aburr molding portion 33 for molding a burr is formed. Thisburr molding portion 33 is open to the outside. - In this embodiment, between the tip end surface outer peripheral edge portion (external corner portion) 24 and the inner
peripheral side surface 13 of themolding hole 11, a burrmolding portion inlet 34 is formed. As shown inFIG. 1B andFIG. 1C , in this embodiment, the width T of this burrmolding portion inlet 34 corresponds to the horizontal dimension between theexternal corner portion 24 of thepunch 2 and the molding hole inner peripheral side surface. - In the case of performing a forging process using the forging device having the aforementioned configuration, as shown in
FIG. 1A , a forging material W is put in themolding hole 11 of thedie 1. - As the forging material W, those made of an aluminum alloy or a copper alloy are preferably used. In this embodiment, a plate material is used as a forging material W. For example, this plate material may be produced by cutting a rolled material by trimming or machining, or may be produced by cutting a flat bar shaped extrusion material or cutting a rectangular continuous cast bar. Needless to say, the forging material W is formed to have a size and a shape capable of being accommodated in the
molding hole 11 of thedie 1. - The forging material W to be input is subjected to a lubrication treatment as necessary and heated to about 400° C. to 600° C., and dies, such as, e.g., the
die 1 and thepunch 2, are also subjected to a lubrication treatment as necessary and heated. Needless to say, in the case of cold forging, the forging material W and the die are not heated. - After setting the forging material W in the
molding hole 11, thepunch 2 is lowered to press the forging material W. As shown inFIG. 1B , in the state immediately after initiation of the pressurization against the forging material W with thepunch 2, the metallic material (metal) constituting the forging material W is divided into the metal flowing toward the center (radially inward direction) and the metal flowing toward the outer side (radially outward direction) by the split flow forging effect. Among them, by the metal flowing toward the center, thefin molding cavities 32 at the center portion are filled sufficiently. On the other hand, since the molding hole innerperipheral side surface 13 is formed in an inclined surface, at the stage in which the tip end portion of thepunch 2 immediately after initiation of the pressurization has not been completely driven into themolding hole 11, the width T of the burrmolding portion inlet 34 between theexternal corner portion 24 of thepunch 2 and the molding hole innerperipheral side surface 13 is sufficiently wide. For this reason, a large amount of metal toward the outside smoothly flows toward theburr molding portion 33, and therefore the metal is efficiently discharged from the baseplate molding portion 31 between the punch tip end surface and the molding hole bottom surface to theburr molding portion 33. Thus, the vertical dimension of the baseplate molding portion 31 can be formed sufficiently small. - In this way, at the initial stage of pressurization, the metal toward the outside actively flows toward the
burr molding portion 33. Therefore, the filling amount of the metal to thefin molding cavities 32 on the outer side is smaller than the metal filling amount of thefin molding cavities 32 at the center portion. - However, as the molding progresses, the width T of the burr
molding portion inlet 34 between theexternal corner portion 24 of thepunch 2 and the molding hole innerperipheral side surface 13 gradually narrows as thepunch 2 descends. In the state immediately before completion of pressurization, as shown inFIG. 1C , the metal toward the outside is suppressed from flowing into theburr molding portion 33, which promotes the inflow to thefin molding cavities 32 on the outer side. In this way, thefin molding cavities 32 on the outer side are also sufficiently filled with the metal, and therefore all thefin molding cavities 32 in the center and outside are sufficiently filled with the metal. Thus, a forged roughly shaped material for a heat sink is molded. - In the present invention, a back pressure forging in which the bottom surface portion of the
fin molding cavity 32 is constituted by a movable back pressure pin so that resistance (back pressure) in the direction opposite to the inflow direction is imparted to the metal flowing into thefin molding cavity 32 may be adopted. - On the other hand, as shown in
FIG. 1D , upon completion of the pressurization by the punch 2 (completion of molding), after thepunch 2 is raised and returned to the initial position, as shown inFIG. 1E , the forged roughly shaped material is pushed upward from themolding hole 11 and discharged by knockout pins (not shown). - In the forged roughly shaped material molded as described above, burrs are removed by trim processing. After that, the formed forged roughly shaped material is subjected to machining and washing as necessary and finished as a
heat sink 9 as a forged product as shown inFIG. 2 . - As described above, according to the forging device of this embodiment, since the molding hole inner
peripheral side surface 13 of thedie 1 is formed in an inclined surface that expands toward upward, as thepunch 2 descends as the forming progresses, the width T of the burrmolding portion inlet 34 on the way from the baseplate molding portion 31 to theburr molding portion 33 gradually narrows. For this reason, at the initial stage of pressurization, the metal flows preferentially to thefin molding cavities 32 at the center portion and theburr molding portion 33, so it is possible to form the vertical dimension (thickness) of the baseplate molding portion 31 as thin as desired. Further, at the final stage of the molding, the width T of the burrmolding portion inlet 34 narrows, so that the flow of the metal toward theburr molding portion 33 is suppressed. For this reason, the metal is sufficiently filled also in thefin molding cavities 32 at the outer peripheral portion, so that the metal is sufficiently filled in all of thefin molding cavities 32, which can effectively prevent occurrence of underfill. - Accordingly, all fin heights of the
heat sink 9 as a forged product can be precisely matched, and a high quality forged product can be produced. - Furthermore, since the thickness of the base
plate molding portion 31 can be made thin, thebase plate 91 of theheat sink 9 as a forged product can be formed thin, so that theheat sink 9 can be reduced in weight and size. - Further, in this embodiment, since the molding hole inner
peripheral side surface 13 of thedie 1 is formed in an inclined surface, it is possible to reduce the load (forging load) by thepunch 2. - That is, in a conventional forging device, as shown in
FIG. 5A , the innerperipheral side surface 13 of themolding hole 11 of thedie 1 and the outerperipheral side surface 23 of thepunch 2 are both formed by vertical planes, and the width of theburr molding portion 33 constituted by and between these side surfaces 13 and 23 is formed constant regardless of the vertical position. Therefore, the metal flowing from the baseplate molding portion 31 into theburr molding portion 33 is filled into theburr molding portion 33 while being in surface contact with the molding hole innerperipheral side surface 13 and the punch outerperipheral side surface 23. For this reason, the flow resistance of the metal flowing through theburr molding portion 33 increases, so that it is necessary to increase the punch load accordingly. As a result, it is necessary to enlarge the press machine, which may cause an increased weight of the forging device. - In contrast, in this embodiment, as shown in
FIG. 1C , the molding hole innerperipheral side surface 13 is formed in an inclined surface. Therefore, the metal flowing from the baseplate molding portion 31 to theburr molding portion 33 only makes line contact with theexternal corner portion 24 of thepunch 2 and is hardly subjected to the surface contact resistance to the molding hole innerperipheral side surface 13 and the punch outerperipheral side surface 23. Therefore, the flow resistance of the metal flowing through theburr molding portion 33 decreases, and the punch load can be reduced accordingly. As a result, it is possible to reduce the size and weight of the forging device itself, and it is possible to produce a large forged product large in projection area with a small compact machine of a press machine. Furthermore, since the flow resistance of the metal flowing through theburr molding portion 33 is small, it is possible to increase the discharge amount of the metal from the baseplate molding portion 31 to theburr molding portion 33, which in turn can assuredly reduce the thickness of the baseplate molding portion 31. Thus, the thickness of thebase plate 91 in the forged product can be more assuredly formed to be thin. - As shown in
FIG. 5A , in a conventional forging device, the contact area and the contact pressure between the burr W3 of the forged roughly shaped material and the punch outerperipheral side surface 23 are large. As shown inFIG. 5B , when raising thepunch 2 after pressurization, the releasability of thepunch 2 to the forged roughly shaped material (burr W3) is bad, which prevents the smooth forging process operation. Therefore, there is a possibility of causing deterioration of the productivity. - In contrast, in this embodiment, as shown in
FIG. 1C , the contact area and the contact pressure between the burr W3 of the forged roughly shaped material and the punch outerperipheral side surface 23 are smaller than those of the conventional forging device shown inFIG. 5A . Therefore, as shown inFIG. 1D , when raising thepunch 2 after pressurization, the releasability of thepunch 2 with respect to the forged roughly shaped material (burr W3) is good, enabling the smooth forging process operation, which can improve the productivity. - Further, as shown in
FIG. 5C , in the conventional forging device, the molding hole innerperipheral side surface 13 is formed vertically. For this reason, it is difficult to discharge the forged roughly shaped material from themolding hole 11 due to the influence of the contact resistance of the burr W3 to the molding hole innerperipheral side surface 13 at the time of pushing out the forged roughly shaped material from themolding hole 11 after molding. In some cases, harmful deformation such as bending deformation may occur in the forged roughly shaped material. From this point as well, the forging process operation cannot be performed smoothly, which may sometimes cause deterioration of the productivity. - On the other hand, as shown in
FIG. 1E , in the forging device of this embodiment, the molding hole innerperipheral side surface 13 is formed in an inclined surface. For this reason, when the forged roughly shaped material is slightly raised after molding, the contact resistance of the burr W3 to the molding hole innerperipheral side surface 13 disappears. Therefore, the forged roughly shaped material can be discharged from themolding hole 11 without difficulty, which can assuredly prevent occurrence of harmful bending deformation, etc., and also can perform the forging process more smoothly. Thus, the productivity can be further improved. - A forging device similar to the forging device of the first embodiment shown in
FIG. 1A toFIG. 1E was prepared. At this time, adie 1 and apunch 2 were prepared under the conditions of producing a heat sink in which columnarpin fins 92 each having a pin diameter φ of 2.2 mm and a height of 10 mm were formed in a staggered arrangement manner on one surface side of thebase plate 91, a distance (distance between pin outer diameters) betweenadjacent pin fins 92 was 0.9 mm, the number of pins was 13×40, a total of 520. - In the forging device, a
die 1 was prepared in which the inclination angle α of the molding hole innerperipheral side surface 13 was 10°. Note that the tip end portion outerperipheral side surface 23 of thepunch 2 was a vertical plane with an inclination angle of 0°. - As a forging material W, a 1,000 series aluminum alloy was prepared. As this material W, a material formed by cutting an extrusion material (flat bar) with a width of 50 mm×a thickness of 4 mm was cut into 80 mm was prepared. The material W has been adjusted to fit the
molding hole 11 of thedie 1. - Then, the dies, such as the
die 1 and thepunch 2, of the forging device was heated to 200° C. or higher, lubricant was directly sprayed onto the dies immediately before forging process, and then the forging material W was put in amolding hole 11 of thedie 1. Note that the forging material W which was pre-heated to 500° C. without performing a lubrication treatment was used. - After setting the forging material W in the forging device as described above, a forging process was performed in the same manner as in the first embodiment to produce the forged product (heat sink) of an example. In the obtained forged product (heat sink), the thickness of the
base plate 91 was made as thin as about 0.3 mm. Furthermore, the variation in the pin height could be controlled to 0.5 mm or less, and the pin heights could be matched without problems. In addition, defects, such as bent deformation which is harmful to the forged product, were not particularly recognized. - On the other hand, except that a forging device similar to the conventional forging device shown in
FIG. 5A toFIG. 5C was used, that is, except that a forging device in which the molding hole innerperipheral side surface 13 of thedie 1 is a vertical plane of an inclination angle 0° was used, a forged product (heat sink) was produced in the same manner as in the aforementioned example. In the obtained forged product, the thickness of thebase plate 91 could not be controlled to 1 mm or less, and the variation in the pin height was also 0.5 mm or more, so that the pin heights could not be aligned. Further, at the time of taking out the forged roughly shaped material from thedie 1, some forged roughly shaped materials had harmful bending deformation. - As will be apparent from the aforementioned examples and comparative examples, according to the forging device of the present invention, the thickness of the
base plate 91 could be made thin, and a highquality heat sink 9 with matched pin heights could be manufactured. -
FIG. 3A andFIG. 3B are cross-sectional views each showing a forging device according to a second embodiment of the present invention. As shown in both figures, in this forging device of the second embodiment, a chamferedportion 15 is formed at theinternal corner portion 14 of the lower end of the molding hole in thedie 1. In this embodiment, the chamferedportion 15 is constituted by an R-plane. By this chamferedportion 15, the portion from the innerperipheral side surface 13 to the bottom surface of themolding hole 11 is formed as a smooth continuous surface. - Further, a chamfered
portion 25 is formed at theexternal corner portion 24 of the tip end surface outer peripheral edge portion of thepunch 2. In this embodiment, the chamferedportion 25 is constituted by an R-plane. By this chamferedportion 25, the portion from the outerperipheral side surface 23 of thepunch 2 to the tip end surface is formed into a smooth continuous surface. - In this forging device of this second embodiment, since the other configuration is substantially the same as that of the forging device of the first embodiment, the same or equivalent parts are allotted by the same reference numerals, and the redundant description will be omitted.
- Also in this forging device of the second embodiment, the same effect as that of the forging device of the first embodiment can be obtained.
- Furthermore, in the second forging device, the chamfered
portions internal corner portion 14 of the molding hole lower end outer peripheral edge portion of thedie 1 and theexternal corner portion 24 of the tip end surface outer peripheral edge portion of thepunch 2, respectively. Therefore, theinternal corner portion 14 and theexternal corner portion 24 each are not formed in a sharp edge shape, so the durability can be improved. That is, if theinternal corner portion 14 of thedie 1 and theexternal corner portion 24 of thepunch 2 each are formed into a sharp edge, stress concentrates on theinternal corner portion 14 and theexternal corner portion 24 when thepunch 2 is driven. In such a case, cracks tend to occur in theinternal corner portion 14 of thedie 1 and theexternal corner portion 24 of thepunch 2, so that the die life becomes short and the durability may deteriorate. - In view of the above, in the second embodiment, the chamfered
portions internal corner portion 14 of thedie 1 and theexternal corner portion 24 of thepunch 2, respectively, theinternal corner portion 14 and theexternal corner portion 24 each have a smooth shape, so it is possible to prevent local concentration of the stress on theinternal corner portion 14 and theexternal corner portion 24 at the time of driving the punch. For this reason, it is possible to effectively prevent occurrence of cracks in theinternal corner portion 14 of thedie 1, theexternal corner portion 24 of thepunch 2, etc., so that the die life can be extended and the durability can be improved. - Furthermore, in this forging device of the second embodiment, since the chamfered
portion 25 is formed at theexternal corner portion 24 of thepunch 2, it is possible to assuredly prevent such a trouble that theexternal corner portion 24 of thepunch 2 comes into contact with the innerperipheral side surface 13 of themolding hole 11 of thedie 1, which can assuredly prevent damage of the due to the contact. - Furthermore, in this forging device of the second embodiment, since the chamfered
portions internal corner portion 14 of themolding hole 11 and theexternal corner portion 24 of thepunch 2, the burr molding portion inflow passage from the baseplate molding portion 31 to the burrmolding portion inlet 34 is formed by a gently curved circular arc flow passage rather than a bent flow passage that rapidly changes in direction. For this reason, the flow of the metal from the baseplate molding portion 31 to theburr molding portion 33 can be performed smoothly during the molding, which can further reduce the punch load. This in turn can further miniaturize the forging device. - Note that in this second embodiment, the chamfered
portions internal corner portion 14 of themolding hole 11 and theexternal corner portion 24 of thepunch 2 are formed by an R-plane, but the present invention is not limited to this. In the present invention, theinternal corner portion 14 and theexternal corner portion 24 may be each formed by a C-plane or multiple planes. -
FIG. 4A andFIG. 4B are cross-sectional views each showing a forging device according to a third embodiment of the present invention. As shown in these figures, in the forging device of this third embodiment, the tip end portion outerperipheral side surface 23 of thepunch 2 is formed in an inclined surface which is inclined with respect to the axis X and gradually approaches the axis X toward the pressing direction (downward direction). In this embodiment, the inclination angle β of the punch outerperipheral side surface 23 with respect to the axis X is set to 0.1° to 20°. The inclination angle β of the punch outerperipheral surface 23 is equal to or smaller than the inclination angle α of the molding hole innerperipheral side surface 13 shown inFIG. 1A . - In this embodiment, although the punch outer
peripheral side surface 23 is formed in a straight line in cross-section, it is not always necessary to form it in a straight line in cross-section. The punch outerperipheral side surface 23 is not necessarily formed in a straight shape in cross-section, but may be formed in a slightly bent arc shape in cross-section or a slightly bent polygonal shape in cross-section or the like. Such cases are also included in the present invention. - Further, the position of the tip end surface outer peripheral edge portion (external corner portion) 24 of the
punch 2 is arranged at a position closer to the axis X than the position of the molding hole lower end inner peripheral edge portion (internal corner portion) 14 of thedie 1. - In this third forging device, since the other configuration is substantially the same as that of the forging device of the first embodiment, the same or equivalent parts are allotted by the same reference numerals, and the redundant description will be omitted.
- The third embodiment of the forging device can also obtain the same effects as those of the aforementioned first forging device.
- Furthermore, in the forging device of the third embodiment, since the tip end portion outer
peripheral side surface 23 of thepunch 2 is formed in the inclined surface, as shown inFIG. 4B , at the time when thepunch 2 is raised slightly after pressurization, the contact of thepunch 2 to the burr W3 is released and the whole area is separated. For this reason, at the time of rising thepunch 2, thepunch 2 can be separated without difficulty from the forged roughly shaped material, enabling a more smooth forging process operation, which further can improve the production efficiency. - Furthermore, in the forging device of this third embodiment, since the
external corner portion 24 of thepunch 2 is arranged inner than theinternal corner portion 14 of themolding hole 11, it is possible to more assuredly prevent theexternal corner portion 24 of thepunch 2 from coming into contact with the inner peripheral side surface of themolding hole 11 of thedie 1, which in turn can more assuredly prevent breakage of the due to the contact. - In each of the above-described embodiments, the case in which the
fin molding cavities 32 are formed on thedie 1 side has been described as an example, but the present invention is not limited thereto. In the present invention, fin molding cavities may be formed on the punch side, or a heat sink (forged product) in which fins are formed on both surfaces of the base plate may be formed by forming fin molding cavities on both the die side and the punch side. - Further, in the above-described embodiments, the case in which the heat sink having pin fins formed on the base plate is described as an example, but the present invention is not limited thereto. The present invention can also be applied to the case of forming a heat sink having plate fins formed on one or both sides of the heat sink.
- Further, in the above-described embodiments, the case in which the heat sink is formed by the present invention has been described as an example, but the present invention is not limited to such a heat sink. The present invention can be adopted in the case of producing a forged product in which a plurality of protrusions is formed on at least one surface of a base plate.
- Further, in the above-described embodiments, the position of the
external corner portion 24 of thepunch 2 from the axis X is set to be equal to or inner than the position of theinternal corner portion 14 of thedie molding hole 11 from the axis X, in other words, the horizontal distance of theexternal corner portion 24 of thepunch 2 from the axis X is set to be equal to or shorter than the horizontal distance of theinternal corner portion 14 of thedie molding hole 11 from the axis X. However, the present invention is not limited to it, and the position of the punchexternal corner portion 24 may be arranged outside the die molding holeinternal corner portion 14. - While illustrative embodiments of the invention have been described herein, the present invention is not limited to the various preferred embodiments described herein, but includes any and all embodiments having equivalent elements, modifications, omissions, combinations (e.g., of aspects across various embodiments), adaptations and/or alterations as would be appreciated by those in the art based on the present disclosure. Limitations in the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the present specification or during the prosecution of the application, which examples are to be construed as non-exclusive. A number of illustrative embodiments are described herein with the understanding that the present disclosure is to be considered as providing examples of the principles of the invention and such examples are not intended to limit the invention to preferred embodiments described herein and/or illustrated herein.
- The present application claims priority to Japanese Patent Application No. 2016-111479 filed on Jun. 3, 2016, the entire disclosure of which is incorporated herein by reference in its entirety.
- While illustrative embodiments of the invention have been described herein, the present invention is not limited to the various preferred embodiments described herein, but includes any and all embodiments having equivalent elements, modifications, omissions, combinations (e.g., of aspects across various embodiments), adaptations and/or alterations as would be appreciated by those in the art based on the present disclosure. Limitations in the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the present specification or during the prosecution of the application, which examples are to be construed as non-exclusive. For example, in the present disclosure, the term “preferably” is non-exclusive and means “preferably, but not limited to.” In this disclosure and during the prosecution of this application, means-plus-function or step-plus-function limitations will only be employed where for a specific claim limitation all of the following conditions are present in that limitation: a) “means for” or “step for” is expressly recited; b) a corresponding function is expressly recited; and c) structure, material or acts that support that structure are not recited. In this disclosure and during the prosecution of this application, the terminology “present invention” or “invention” may be used as a reference to one or more aspect within the present disclosure. The language present invention or invention should not be improperly interpreted as an identification of criticality, should not be improperly interpreted as applying across all aspects or embodiments (i.e., it should be understood that the present invention has a number of aspects and embodiments), and should not be improperly interpreted as limiting the scope of the application or claims. In this disclosure and during the prosecution of this application, the terminology “embodiment” can be used to describe any aspect, feature, process or step, any combination thereof, and/or any portion thereof, etc. In some examples, various embodiments may include overlapping features. In some examples, various embodiments may include overlapping features. In this disclosure and during the prosecution of this case, the following abbreviated terminology may be employed: “e.g.” which means “for example;” and “NB” which means “note well.”
- The forging device of the present invention can be suitably applied in manufacturing a forged product, such as, e.g., a heat sink in which a large number of fins are formed on a base plate.
-
- 1: die (lower die)
- 11: molding hole
- 13: inner peripheral side surface
- 14: internal corner portion
- 15: chamfered portion
- 2: punch (upper die)
- 23: outer peripheral side surface
- 24: external corner portion
- 25: chamfered portion
- 31: base plate molding portion
- 32: fin molding cavity (protrusion molding cavity)
- 33: burr molding portion
- 9: heat sink (forged product)
- 91: base plate
- 92: fin (pin fin)
- W: forging material
- W3: burr
- X: axis
- α: inclination angle of the molding hole inner peripheral side surface
- β: inclination angle of the punch tip end portion outer peripheral side surface
Claims (8)
1. A forging device for producing a forged product in which a protrusion is formed on a base plate, comprising:
a die having a molding hole; and
a punch to be driven into the molding hole,
wherein a protrusion molding cavity is formed in at least one of a bottom surface of the molding hole of the die and a tip end surface of the punch,
wherein a base plate molding portion is formed between the tip end surface of the punch and the bottom surface of the molding hole,
wherein a burr molding portion is formed between a tip end portion outer peripheral side surface of the punch and an inner peripheral side surface of the molding hole, and
wherein the inner peripheral side surface of the molding hole is formed by an inclined surface which is inclined with respect to an axis and approaches the axis toward a pressing direction of the punch.
2. The forging device as recited in claim 1 ,
wherein a chamfered portion is formed at an internal corner portion between the inner peripheral side surface and the bottom surface of the molding hole.
3. The forging device as recited in claim 1 ,
wherein the tip end portion outer peripheral side surface of the punch is formed by an inclined surface which is inclined with respect to the axis and approaches the axis toward the pressing direction of the punch, and
wherein an inclination angle of the tip end portion outer peripheral side surface of the punch with respect to the axis is formed to be equal to or less than an inclination angle of the inner peripheral side surface of the molding hole with respect to the axis.
4. The forging device as recited in claim 1 ,
wherein a chamfered portion is formed at an external corner portion between the tip end portion outer peripheral side surface and the tip end surface of the punch.
5. The forging device as recited in claim 1 ,
wherein an external corner portion between the tip end portion outer peripheral side surface and the tip end surface of the punch is arranged at a position closer to the axis than the internal corner portion between the inner peripheral side surface and the bottom surface of the molding hole.
6. The forging device as recited in claim 1 ,
wherein the protrusion molding cavity is constituted by a fin molding cavity for molding a fin of a heat sink.
7. A forging method for producing a forged product in which a protrusion is formed on a base plate, comprising:
a step of setting a forging material in a molding hole of a die formed by an inclined surface in which an inner peripheral side surface of a molding hole is inclined with respect to an axis and approaches the axis toward an inner portion of the molding hole; and
a step of pressurizing the forging material by driving a punch into the molding hole;
wherein in the step of pressurizing the forging material, a protrusion is formed by a protrusion molding cavity formed on at least one of a bottom surface of the molding hole of the die and a tip end surface of the punch,
wherein a base plate is molded by a base plate molding portion formed between the tip end surface of the punch and the bottom surface of the molding hole, and
wherein a burr is formed by a burr molding portion formed between a tip end portion outer peripheral side surface of the punch and the inner peripheral side surface of the molding hole.
8. A production method of a forged product for producing a forged product in which a protrusion is formed on a base plate, comprising:
a step of setting a forging material in a molding hole of a die formed by an inclined surface in which an inner peripheral side surface of the molding hole is inclined with respect to an axis and approaches the axis towards the inner portion of the molding hole; and
a step of pressurizing the forging material by driving a punch into the molding hole;
wherein in the step of pressurizing the forging material, a protrusion is formed by a protrusion molding cavity formed on at least one of a bottom surface of the molding hole of the die and a tip end surface of the punch,
wherein a base plate is molded by a base plate molding portion formed between a tip end surface of the punch and the bottom surface of the molding hole, and
wherein a burr is formed by a burr molding portion formed between a tip end portion outer peripheral side surface of the punch and the inner peripheral side surface of the molding hole.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016-111479 | 2016-06-03 | ||
JP2016111479A JP6718314B2 (en) | 2016-06-03 | 2016-06-03 | Forging machine |
PCT/JP2017/016021 WO2017208669A1 (en) | 2016-06-03 | 2017-04-21 | Forging device |
Publications (1)
Publication Number | Publication Date |
---|---|
US20190224740A1 true US20190224740A1 (en) | 2019-07-25 |
Family
ID=60479519
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/306,806 Abandoned US20190224740A1 (en) | 2016-06-03 | 2017-04-21 | Forging device |
Country Status (5)
Country | Link |
---|---|
US (1) | US20190224740A1 (en) |
EP (1) | EP3466559B1 (en) |
JP (1) | JP6718314B2 (en) |
CN (1) | CN109195724A (en) |
WO (1) | WO2017208669A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11456233B2 (en) * | 2019-02-15 | 2022-09-27 | Fuji Electric Co., Ltd. | Semiconductor module, vehicle and manufacturing method |
CN117463933A (en) * | 2023-08-09 | 2024-01-30 | 徐州众工精密模锻有限公司 | Mould quick change formula hot mould forging and pressing device |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6964507B2 (en) * | 2017-12-19 | 2021-11-10 | 昭和電工株式会社 | Forging equipment |
DE102019001383B4 (en) * | 2019-02-26 | 2020-12-17 | Holzhauer Gmbh & Co. Kg | Method of manufacturing a cold plate |
CN113260470B (en) * | 2019-09-20 | 2023-04-28 | 本田技研工业株式会社 | Forging method |
DE102020200649A1 (en) * | 2020-01-21 | 2021-07-22 | Volkswagen Aktiengesellschaft | Partial forming for the production of heat sinks |
EP4273906A1 (en) * | 2022-05-05 | 2023-11-08 | Siemens Aktiengesellschaft | Method of manufacturing a heat sink with fins and a circumferential sidewall |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS5112370A (en) * | 1974-07-22 | 1976-01-30 | Myamoto Kogyo Kk | HANDOTAIREIKYAKUYOHONETSUKINO SEIZOHOHO |
DE2446413C3 (en) * | 1974-09-28 | 1978-12-07 | Kabel- Und Metallwerke Gutehoffnungshuette Ag, 3000 Hannover | Device for the non-cutting manufacture of bevel gears |
SU1255259A1 (en) * | 1984-12-06 | 1986-09-07 | Камское Ордена Ленина Объединение По Производству Большегрузных Автомобилей | Method of producing annular forgings |
JPH0857573A (en) * | 1994-08-19 | 1996-03-05 | Yamada Seisakusho Kk | Forming method of scroll member |
JP3885197B2 (en) * | 1997-04-11 | 2007-02-21 | 株式会社アルファ | Heat exchange component having long hole in substrate and method for manufacturing the same |
JP2010074024A (en) * | 2008-09-22 | 2010-04-02 | Chubu Reikan Kk | Method of manufacturing heat sink for yag laser |
CN201684773U (en) * | 2010-05-25 | 2010-12-29 | 东风汽车有限公司 | Die for forming disc type forging |
CN201921930U (en) * | 2010-11-02 | 2011-08-10 | 佑达光电科技(苏州)有限公司 | Mold with new structure for deburring mesopore and shaping |
JP6214973B2 (en) * | 2013-09-02 | 2017-10-18 | 日立オートモティブシステムズ株式会社 | Heat sink and heat sink manufacturing method |
CN103990703A (en) * | 2014-06-05 | 2014-08-20 | 昆山电子羽电业制品有限公司 | Deburring and raising die |
-
2016
- 2016-06-03 JP JP2016111479A patent/JP6718314B2/en active Active
-
2017
- 2017-04-21 EP EP17806229.5A patent/EP3466559B1/en active Active
- 2017-04-21 US US16/306,806 patent/US20190224740A1/en not_active Abandoned
- 2017-04-21 WO PCT/JP2017/016021 patent/WO2017208669A1/en unknown
- 2017-04-21 CN CN201780033461.0A patent/CN109195724A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11456233B2 (en) * | 2019-02-15 | 2022-09-27 | Fuji Electric Co., Ltd. | Semiconductor module, vehicle and manufacturing method |
CN117463933A (en) * | 2023-08-09 | 2024-01-30 | 徐州众工精密模锻有限公司 | Mould quick change formula hot mould forging and pressing device |
Also Published As
Publication number | Publication date |
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WO2017208669A1 (en) | 2017-12-07 |
JP2017217655A (en) | 2017-12-14 |
EP3466559A4 (en) | 2020-02-12 |
JP6718314B2 (en) | 2020-07-08 |
CN109195724A (en) | 2019-01-11 |
EP3466559B1 (en) | 2022-06-22 |
EP3466559A1 (en) | 2019-04-10 |
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