Forging apparatus and forging method

Abstract

The forging and pressing apparatus pressurizes a base member to form a protrusion. The forging and pressing apparatus comprises a mold, a punch moving section, and a slider moving section. The mold includes a punch having a pressing surface, a die having a first receiving surface facing the central region of the pressing surface, and a slider having a second receiving surface facing the peripheral region of the pressing surface, with a clearance between it and the pressing surface that is laterally open, and which is arranged to be movable relative to the die in the direction in which the punch and die face each other. A forming hole for forming a protrusion is formed in at least one of the pressing surface and the first receiving surface. The punch moving section moves the punch toward the die. The slider moving section moves the slider, which receives the pressing force from the punch during the punch movement process, relative to the die.

Description

Technical Field

[0001] The present invention relates to a forging device and a forging method.

Background Art

[0002] Conventionally, a forging device for manufacturing a heat sink by pressing a base member to form a plurality of fins has been known. A conventional forging device includes a mold having a punch with a pressing surface and a die with a receiving surface facing the pressing surface. A forming hole for forming fins is formed in at least one of the pressing surface and the receiving surface. This mold is a closed mold (fully closed type) (see Patent Documents 1 to 3).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] As described above, the mold of the conventional forging device is a closed mold. Therefore, when the base member is pressed by the punch, the space between the punch and the die becomes a closed space, and there is no escape path for the material forming the base member. As a result, for example, problems such as being unable to form fins longer than the required length or an increase in the pressing force required for the punch for fin formation occur. Such problems are common to forging devices and forging methods for manufacturing heat sinks and forging devices and forging methods for pressing a base member to form a protruding portion.

[0005] The present invention aims to provide a power control system capable of solving at least one of the above-mentioned problems. [Means for solving the problem]

[0006] (1) The forging press apparatus disclosed herein is a forging press apparatus that pressurizes a base member to form a protrusion. The forging press apparatus is a mold, comprising: a punch having a pressing surface; a die having a first receiving surface facing the central region of the pressing surface; a slider having a second receiving surface facing the peripheral region of the pressing surface, the second receiving surface having a clearance between it and the pressing surface that is laterally open; and a slider arranged to be movable relative to the die in the direction in which the punch and the die face each other, wherein a forming hole for forming the protrusion is formed in at least one of the pressing surface and the first receiving surface; a punch moving unit for moving the punch toward the die; and a slider moving unit for moving the slider, which receives the pressing force from the punch during the movement of the punch, relative to the die.

[0007] In this configuration, the slider movement unit moves the slider, which receives the pressing force from the punch, relative to the die. As a result, the base member pressed by the punch extends laterally through the clearance between the pressing surface and the second receiving surface. This lateral extension promotes the extension of the base member into the molding hole. Therefore, with this configuration, for example, compared to a configuration without a slider, it is possible to form a protrusion while reducing the pressing force of the punch.

[0008] (2) In the forging apparatus described above, the slider moving section may be configured to have a biasing member that biases the slider toward the punch. With this configuration, the biasing force of the biasing member can be used to move the slider, which receives the pressing force from the punch, relative to the die.

[0009] (3) In the forging apparatus described above, the slider moving part may be configured to support the slider such that the second receiving surface is located closer to the punch than the first receiving surface, before the slider receives the pressing force from the punch. With this configuration, a base member can be placed on the second receiving surface and a protrusion can be formed by moving the punch.

[0010] (4) In the forging apparatus described above, the die may be configured to have a stopper that stops the relative position of the slider with respect to the die at a reference position during the movement of the punch. With this configuration, the stopper can more effectively limit the distance between the pressing surface and the second receiving surface from falling below a reference value.

[0011] (5) A forging method disclosed herein is a forging method for forming a protrusion by pressurizing a base member, wherein the central portion of the base member is positioned between a pressing surface of a punch and a first receiving surface of a die, the peripheral portion of the base member is positioned between the pressing surface and a second receiving surface of a slider, the punch is moved toward the die, and during the movement of the punch, the slider, which receives the pressing force from the punch, is moved relative to the die while maintaining a laterally open clearance between the pressing surface and the second receiving surface.

[0012] (6) In the forging method described above, the base member may have a shape in which the first surface portion facing the first receiving surface protrudes more than the second surface portion facing the second receiving surface. In this method, the step between the first surface portion and the second surface portion distributes the pressing force from the punch into a pressing force toward the die and a lateral force toward the clearance. The lateral force toward the clearance further promotes the lateral extension of the base member, and consequently further promotes the extension of the base member into the forming hole. For this reason, this method makes it possible to form a protruding portion while more effectively reducing the pressing force of the punch compared to, for example, a configuration without a slider.

[0013] (7) In the forging process described above, before the slider receives the pressing force from the punch, the second receiving surface may be positioned closer to the punch than the first receiving surface, and the base member may be positioned such that the first surface portion of the base member is located on the inner circumference side of the slider and the second surface portion is located on the second receiving surface. According to this method, the pressing force from the punch can be more effectively distributed into a pressing force toward the die and a lateral force toward the clearance.

[0014] Furthermore, the present invention can also be realized in other forms, such as a forging apparatus, a forging method, a forging system, or a forging method. [Brief explanation of the drawing]

[0015] [Figure 1] Cross-sectional view showing the overall configuration of the forging system in the embodiment. [Figure 2] Top view of a forging machine [Figure 3] Top view of the base member [Figure 4] Side view of the base member [Figure 5] Side view of the heatsink [Figure 6] Cross-sectional view showing the operating state of the forging machine before pressurization. [Figure 7]Cross-sectional view showing the operating state of the forging apparatus at the start of pressurization [Figure 8] Cross-sectional view showing the operating state of the forging apparatus at the completion of pressurization [Figure 9] Top view of the base member after pressure processing [Figure 10] Explanatory drawing showing the relationship between the state of the base member and the pressing force at the start of pressurization [Figure 11] Explanatory drawing showing the relationship between the state of the base member and the pressing force during the pressurization process [Figure 12] Explanatory drawing showing the relationship between the state of the base member and the pressing force at the completion of pressurization

Mode for Carrying Out the Invention

[0016] A. Embodiment: A-1. Configuration of the forging system: FIG. 1 is a cross-sectional view showing the overall configuration of the forging system 10 in the present embodiment. In each figure, XYZ axes orthogonal to each other for specifying directions are shown. In this specification, for convenience, the positive direction of the Z axis is referred to as the upward direction, and the negative direction of the Z axis is referred to as the downward direction. However, the molding die 102 described later may actually be installed in a direction different from such a direction. The forging system 10 is, for example, a system for manufacturing a heat sink 400A (see FIG. 5 described later) having a plurality of fins 430A (an example of a protruding portion). As shown in FIG. 1, the forging system 10 includes a forging apparatus 100 and a control apparatus 200. The forging apparatus 100 is an example of a forging press apparatus.

[0017] A-1-1. Configuration of the forging apparatus:<00001Figure 2 is a top view of the forging apparatus 100. In Figure 2, the die 120 is hidden below the punch 110, but is shown by a solid line. The forging apparatus 100 is a device for forming multiple fins 430A by applying pressure to a base member 400 (see Figure 3, described later) by cold forging. Cold forging is a processing technique in which a material is formed into the desired shape by applying strong pressure with a mold at room temperature without heating the material, causing plastic deformation. The forging apparatus 100 comprises a mold 102 and a drive device 104.

[0018] (Mold): The mold 102 is a side-open type mold (die). A side-open type mold is used in open-type forging, where the material is not completely enclosed by the mold but compressed and formed in an open state. The mold 102 includes a punch 110, a die 120, a slide die 130, a guide die 140, a die case 150, a support member 160, a die spacer 170, a back plate 180, and a plurality of springs 190. The mold 102 is made of a metal such as special steel. The slide die 130 is an example of a slider, the back plate 180 and springs 190 are examples of slider movement parts, and springs 190 are an example of biasing members.

[0019] The punch 110 is a male die having a flat pressing surface 112. In this embodiment, the punch 110 is the upper die, and the pressing surface 112 faces downward. The shape of the punch 110 is disc-shaped (see Figure 2). When viewed in the vertical direction (the direction in which the punch 110 and die 120 face each other), the shape of the pressing surface 112 is circular.

[0020] The die 120 is a prismatic female mold having a first receiving surface 121. In this embodiment, the die 120 is the lower mold, and the first receiving surface 121 faces upward. When viewed in the vertical direction, the shape of the first receiving surface 121 is rectangular (for example, a rectangle). The first receiving surface 121 faces the central portion of the pressing surface 112. The central portion of the pressing surface 112 is the portion of the pressing surface 112 that includes the central portion (center line M of the molding die 102) but does not include the peripheral portion. That is, when viewed in the vertical direction, the outline of the first receiving surface 121 is located inside the outline of the pressing surface 112 around its entire circumference. Specifically, the diameter W2 (width) of the first receiving surface 121 is smaller than the diameter W1 (width) of the pressing surface 112.

[0021] Multiple molding holes 128 are formed in the first receiving surface 121. Each molding hole 128 is for forming each fin 430A of the heat sink 400A. The multiple molding holes 128 are arranged at equal intervals from each other, for example, in a grid pattern. However, the multiple molding holes 128 are not limited to a grid pattern and may be arranged in various arrangement patterns depending on the shape of the object to be manufactured.

[0022] The support member 160 is a member that supports the die 120 (see Figure 1). The upper surface of the support member 160 is in contact with the lower surface of the die 120. Specifically, the support member 160 has a support base 162 and a support pin 164. The support base 162 is a plate-shaped portion that supports the die 120. The support pin 164 is a rod-shaped portion that extends downward from the lower surface of the support base 162. The die spacer 170 is a member that holds the support member 160. An upward-opening accommodation space 172 is formed on the upper surface of the die spacer 170. The accommodation space 172 is a space capable of accommodating the support base 162. A support spacer 174 is positioned between the lower surface of the support base 162 and the bottom surface of the accommodation space 172. The depth of the molding hole 128 can be changed by changing the thickness of the support spacer 174 or by removing the support spacer 174.

[0023] The slide die 130 has a second receiving surface 132. In this embodiment, the second receiving surface 132 faces the same direction (upward) as the first receiving surface 121. When viewed from above, the slide die 130 has an annular shape that surrounds the die 120. The inner surface of the slide die 130 is in contact with the outer surface of the die 120.

[0024] The second receiving surface 132 has an annular shape that surrounds the first receiving surface 121. The inner circumference of the first receiving surface 121 is rectangular, and the outer circumference is circular. The second receiving surface 132 faces the peripheral portion of the pressing surface 112. The peripheral portion of the pressing surface 112 is the annular part of the pressing surface 112 that does not include the central portion. The peripheral portion of the pressing surface 112 may or may not include the periphery of the pressing surface 112. That is, in a vertical view, the inner outer shape of the slide die 130 is located inside the outer shape of the pressing surface 112 over its entire circumference. In a vertical view, the outer outer shape of the slide die 130 may substantially coincide with the outer shape of the pressing surface 112 over its entire circumference, may be located inside the outer shape of the pressing surface 112, or may be located outside the outer shape of the pressing surface 112. The clearance C between the pressing surface 112 and the first receiving surface 121 and the second receiving surface 132 is open to the side of the mold 102 (in the direction along the XY plane, radially outward from the slide die 130) around the entire circumference. In this embodiment, the guide die 140 is located to the side of the clearance C, but at least one of the gaps between the punch 110 and the guide die 140, and between the slide die 130 and the guide die 140, is secured to allow air to escape.

[0025] The slide die 130 is positioned to be movable relative to the die 120 in the vertical direction. Specifically, an insertion hole 134 is formed in the center of the slide die 130, penetrating it vertically. The die 120 is inserted into the insertion hole 134. The slide die 130 is movable relative to the die 120 in the vertical direction (one example being the direction in which the punch and die face each other).

[0026] The die 120 has a first stopper. The first stopper stops the relative position of the slide die 130 with respect to the die 120 at a lower limit position (an example of a reference position shown in Figures 1 and 8). Specifically, the outer circumferential surface of the die 120 has a first stepped surface 123 facing upward. On the other hand, the inner circumferential surface of the slide die 130 has a second stepped surface 133 facing downward. The first stepped surface 123 and the second stepped surface 133 face each other in the vertical direction. Therefore, the slide die 130 is restricted from moving to a position lower than the lower limit position relative to the die 120.

[0027] The back plate 180, which supports the support member 160 and the multiple springs 190, has a disc shape overall. Insertion holes H1, H2, and H3 are formed in the central part of the back plate 180, penetrating it vertically. Insertion holes H1, H2, and H3 are holes into which the support pins 164 of the support member 160 can be inserted. A die 120 is positioned above the central part of the back plate 180, and a slide die 130 is positioned above the peripheral part of the back plate 180. The lower surface 135 of the slide die 130 faces the upper surface 181 of the back plate 180 in the vertical direction.

[0028] Multiple springs 190 (12 in Figure 2) are positioned to overlap both the peripheral edge of the pressing surface 112 and the slide die 130 when viewed in the vertical direction. The multiple springs 190 are arranged to surround the die 120 when viewed in the vertical direction. The multiple springs 190 are arranged at equal intervals from each other in the circumferential direction when viewed in the vertical direction (see Figure 2). The multiple springs 190 are arranged point-symmetrically with respect to the die 120 (center line M of the molding die 102) when viewed in the vertical direction. Multiple housing chambers 183 are formed on the upper surface 181 of the back plate 180. Each housing chamber 183 is a recess that opens upward, and a spring 190 is housed in each housing chamber 183. The multiple housing chambers 183 are arranged to surround the die 120 when viewed in the vertical direction. The multiple housing chambers 183 are arranged at equal intervals from each other in the circumferential direction when viewed in the vertical direction (see Figure 2). The multiple housing chambers 183 are arranged point-symmetrically with respect to the die 120 when viewed from above. Each spring 190 is, for example, a coil spring and is arranged to be compressible and deformable in the vertical direction within each housing chamber 183.

[0029] The spring 190 moves the slide die 130, which receives the pressing force from the punch 110, relative to the die 120 while maintaining the clearance C during the movement of the punch 110. In this embodiment, the slide die 130 indirectly receives the pressing force from the punch 110 via the base member 400 (first base portion 410). The spring constant and the like are set so that the repulsive force (biasing force) of the spring 190 is smaller than the pressing force from the punch 110. The repulsive force of the spring 190 is, for example, 1 / 10 of the pressing force from the punch 110. The repulsive force of the spring 190 may be, for example, 1 / 12 or more and 1 / 8 or less of the pressing force from the punch 110, or 1 / 11 or more and 1 / 9 or less of the pressing force. The movement process of the punch 110 is the movement process from the point when the punch 110 begins to apply pressing force to the slide die 130 (base member 400) (see Figure 7 below) to the point when the slide die 130 reaches its lower limit position (see Figure 8 below).

[0030] In this embodiment, the backplate 180 has, for example, three plates 182, 184, and 186. The upper plate 182 is located in the upper part of the backplate 180 and has an insertion hole H1 formed through its center. The middle plate 184 is located in the middle part of the backplate 180 and has an insertion hole H2 formed through its center. The lower plate 186 is located in the lower part of the backplate 180 and has an insertion hole H3 formed through its center. Each accommodation chamber 183 is formed by a hole that passes through the upper plate 182 and the middle plate 184.

[0031] The guide die 140 is a member that guides the vertical movement of the punch 110 and the slide die 130. The guide die 140 is a cylindrical body having a guide hole 142 that penetrates in the vertical direction. The punch 110, die 120, and slide die 130 are arranged inside the guide hole 142. The punch 110 is positioned to be movable in the vertical direction along the inner wall surface that constitutes the guide hole 142. The die 120 is located directly below the central portion of the punch 110 and is positioned to be immovable in the vertical direction. The slide die 130 is located directly below the peripheral portion of the punch 110 and is positioned to be movable in the vertical direction along the inner wall surface that constitutes the guide hole 142.

[0032] The guide die 140 has a second stopper. The second stopper stops the relative position of the slide die 130 with respect to the die 120 at the upper limit position (the position shown in Figure 6). Specifically, a third stepped surface 144 facing downward is formed on the inner circumferential surface of the guide die 140. On the other hand, a fourth stepped surface 136 facing upward is formed on the outer circumferential surface of the slide die 130. The third stepped surface 144 and the fourth stepped surface 136 face each other in the vertical direction. Therefore, the slide die 130 is restricted from moving to a position higher than the upper limit position relative to the die 120.

[0033] The die case 150 is a component that covers the outer circumference of the molding die 102. The die case 150 is a cylindrical body having a guide hole 152 that penetrates in the vertical direction. The die case 150 covers the entire circumference of the guide die 140 and the back plate 180 (excluding the lower plate 186). The lower end 156 of the die case 150 is fixed to the back plate 180 (lower plate 186). The die case 150 has a fixing part that prevents the guide die 140 from coming off. Specifically, a fifth stepped surface 154 facing downward is formed on the inner circumferential surface of the die case 150. On the other hand, a sixth stepped surface 146 facing upward is formed on the outer circumferential surface of the guide die 140. The fifth stepped surface 154 and the sixth stepped surface 146 face each other in the vertical direction. Therefore, the guide die 140 is prevented from coming off upward relative to the die case 150.

[0034] (Drive system): The drive unit 104 is a device that moves the punch 110 in the vertical direction. The control device 200 may be mechanical or hydraulic, for example. The drive unit 104 is an example of a punch moving part.

[0035] A-1-2. Control device configuration: The control device 200 controls the drive unit 104. The control device 200 comprises a CPU 210, a memory 220, and an interface unit 230, and each of these units is connected to each other via a bus (not shown) so as to be able to communicate with each other.

[0036] The CPU 210 controls the drive unit 104 by executing a computer program read from the memory 220. The memory 220 is composed of, for example, ROM, RAM, or a hard disk drive (HDD), and stores various data, programs, and models, and is used as a workspace and temporary storage area for data when executing various programs and models. The forging control program is also stored in the memory 220. The forging control program is a computer program that executes control processing such as the operation of the punch 110 during forging. These programs are provided stored on a computer-readable recording medium (not shown), such as a CD-ROM, DVD-ROM, or USB memory, and are stored in the memory 220 by being installed in the control device 200. The interface unit 230 is composed of, for example, a LAN interface or a USB interface, and communicates with other devices by wired or wireless connection.

[0037] A-2. Base components and heat sink: Figure 3 is a top view of the base member 400, and Figure 4 is a side view of the base member 400. As shown in Figures 3 and 4, the base member 400 is a plate-shaped member as a whole, and is made of a metal (such as iron, copper, or aluminum). The base member 400 has a first base portion 410 and a second base portion 420.

[0038] The shape of the first base portion 410 is, for example, a rectangular flat plate shape. The shape of the second base portion 420 is the same as that of the first base portion 410, for example, a rectangular flat plate shape. The second base portion 420 is positioned on one surface of the first base portion 410. In a view perpendicular to the base member 400, the outline of the second base portion 420 is located inside the outline of the first base portion 410 around its entire circumference. In a view perpendicular to the base member 400, the second base portion 420 is positioned in the central part of the first base portion 410. Of the one surface of the first base portion 410, the surface portion on which the second base portion 420 is not positioned is the first surface portion N1, and the upper surface of the second base portion 420 is the second surface portion N2. The second surface portion N2 protrudes from the first surface portion N1.

[0039] Figure 5 is a side view of the heat sink 400A. As shown in Figure 5, the heat sink 400A has a support portion 410A, a base portion 420A, and a plurality of fins 430A. The shape of the support portion 410A is, for example, a rectangular flat plate. The shape of the base portion 420A is the same as that of the support portion 410A, for example, a rectangular flat plate. The base portion 420A is positioned on one surface of the support portion 410A. In a view perpendicular to the heat sink 400A, the outline of the base portion 420A is located inside the outline of the support portion 410A around its entire circumference. In a view perpendicular to the heat sink 400A, the base portion 420A is positioned in the central part of the support portion 410A. The plurality of fins 430A are formed to protrude from the upper surface of the base portion 420A. The plurality of fins 430A are arranged at equal intervals from one another.

[0040] A-3. Operation of the forging system: Figure 6 is a cross-sectional view showing the operating state of the forging apparatus 100 before pressurization, Figure 7 is a cross-sectional view showing the operating state of the forging apparatus 100 at the start of pressurization, and Figure 8 is a cross-sectional view showing the operating state of the forging apparatus 100 at the completion of pressurization. The die case 150 is omitted in each figure.

[0041] (Before pressurization): As shown in Figure 6, before the punch 110 is pressurized (before the punch 110 moves), the punch 110 is separated from the die 120 and the slide die 130. The spring 190 supports the slide die 130 such that the second receiving surface 132 of the slide die 130 is positioned above (towards the punch 110) the first receiving surface 121 of the die 120. The base member 400 is placed inside the mold 102 in this state. The second surface portion N2 of the base member 400 faces the pressing surface 112 of the punch 110 in the vertical direction. The second base portion 420 (second surface portion N2) of the base member 400 is located inside the insertion hole 134 of the slide die 130. The first surface portion N1 of the base member 400 faces the second receiving surface 132 of the slide die 130 in the vertical direction. The back surface of the first base portion 410 of the base member 400 is located above the second receiving surface 132 by a thickness T1 of the first base portion 410.

[0042] As the punch 110 moves downward (towards the die 120), and the pressing surface 112 contacts the back surface of the base member 400, as shown in Figure 7, the punch 110 begins to press against the slide die 130. At this time, the clearance (open clearance) C between the punch 110 and the slide die 130 is open laterally around the entire circumference. The distance between the pressing surface 112 of the punch 110 and the second receiving surface 132 of the slide die 130 (hereinafter referred to as "clearance distance D1") coincides with the thickness T1 of the first base portion 410.

[0043] As the punch 110 moves further downward, the pressing force from the punch 110 is applied to the slide die 130 via the base member 400 (first base portion 410). The slide die 130 moves downward due to the pressing force of the punch 110, while receiving the repulsive force of the spring 190.

[0044] (At the start of pressurization): As the slide die 130 moves further downward due to the pressing force from the punch 110, the second surface portion N2 (working surface) of the base member 400 comes into contact with the first receiving surface 121 of the die 120. When the second surface portion N2 comes into contact with the first receiving surface 121, pressure is applied to the base member 400. At this time, the clearance C between the punch 110 and the slide die 130 is open laterally around the entire circumference. The clearance distance D1 maintains the thickness T1.

[0045] As the punch 110 moves further downward, the second base portion 420 of the base member 400 is sandwiched between the punch 110 and the die 120 and subjected to vertical pressure. During this pressurizing process on the base member 400, the spring 190 maintains a constant clearance distance D1 while releasing the clearance C laterally around the entire circumference. As a result, the base member 400 pressed by the punch 110 extends laterally through the clearance C. This lateral extension promotes the extension of the base member 400 into each molding hole 128.

[0046] Here, the step between the first surface portion N1 and the second surface portion N2 of the base member 400 distributes the pressing force F from the punch 110 into a pressing force F1 toward the die 120 (downward) and a lateral force F2 toward the clearance C (radially outward of the molding die 102). The lateral force F2 toward the clearance C further promotes the lateral extension of the base member 400, and consequently further promotes the extension of the base member 400 toward the molding hole 128.

[0047] (Upon completion of pressurization): As shown in Figure 8, when the punch 110 moves downward and the slide die 130 reaches its lower limit position, the slide die 130 is stopped by the first stopper. This completes the pressurization of the base member 400 and forms the heat sink 400A. Until the pressurization of the base member 400 is complete, the spring 190 keeps the clearance distance D1 constant while releasing the clearance C laterally around the entire circumference. Therefore, throughout the entire pressurization process of the base member 400, the clearance C is released laterally around the entire circumference and the clearance distance D1 is kept constant.

[0048] Figure 9 is a top view of the base member 400 after pressurization. As shown in Figure 9, the first base portion 410 of the base member 400 is extended laterally by the lateral force F2 toward the clearance C side during pressurization. The heat sink 400A is completed by cutting off the excess portion of the first base portion 410 (the dotted line portion in Figure 9).

[0049] In this embodiment, the protruding height of the fin 430A can be adjusted by adjusting the following parameters of the base member 400. (1) The higher the ratio of the thickness T2 / T1 (T1 thickness of the first base portion 410, T2 thickness of the second base portion 420), the higher the protruding height of the fin 430A can be. (2) The larger the area ratio of N2 / N1 (area of ​​the first surface portion N1, area of ​​the second surface portion N2), the greater the protrusion height of the fin 430A can be.

[0050] A4. Effects of this embodiment: In the forging apparatus 100 according to this embodiment, the spring 190 moves the slide die 130, which receives the pressing force from the punch 110, relative to the die 120 while maintaining a clearance C during the movement of the punch 110 (see Figure 8). As a result, the base member 400 pressed by the punch 110 extends laterally through the clearance C between the pressing surface 112 and the second receiving surface 132. This lateral extension promotes the extension of the base member 400 into the forming hole 128. Therefore, according to this embodiment, for example, compared to a configuration without the slide die 130, it is possible to form a protruding portion (fin 430A) while reducing the pressing force of the punch 110.

[0051] Figure 10 is an explanatory diagram showing the relationship between the state of the base member 400 and the pressing force at the start of pressurization, Figure 11 is an explanatory diagram showing the relationship between the state of the base member 400 and the pressing force during the pressurization process, and Figure 12 is an explanatory diagram showing the relationship between the state of the base member 400 (heat sink 400A) and the pressing force at the completion of pressurization. In each figure, the vertical axis represents the pressing force (load applied to the base member 400 (tf: 1000 kg-force)), and the horizontal axis represents the elapsed time (seconds) from the start of pressurization.

[0052] As shown in Figures 10 to 12, during the pressurizing process, the pressing force F from the punch 110 is distributed into a pressing force F1 toward the die 120 and a lateral force F2 toward the clearance C. As the pressing force from the punch 110 increases, the material of the second base portion 420 of the base member 400 that does not form the base portion 420A is pushed toward the first base portion 410 by the lateral force F2 toward the clearance C. As a result, during the pressurizing process, the first base portion 410 extends laterally while maintaining its thickness. Consequently, the clearance distance D1 is more easily maintained at a nearly constant level during the pressurizing process. When the material of the portion that does not form the base portion 420A is pushed toward the first base portion 410, the material of the second base portion 420 that forms the base portion 420A is promoted to extend downward. Therefore, in cold forging, a protruding portion (fin 430A) can be formed with a relatively small pressing force (for example, 120 tons or less).

[0053] B. Variations: The present invention is not limited to the embodiments described above, and can be modified in various forms without departing from its spirit, for example, the following modifications are also possible.

[0054] The configurations of the forging system 10 and forging apparatus 100 in the above embodiment are merely examples and can be modified in various ways.

[0055] The forging apparatus and forging method are not limited to the forging apparatus 100 and forging method in the above embodiment. The forging apparatus and forging method can be any processing apparatus or method that applies pressure to a material and plastically deforms it to form a desired shape, such as a press working apparatus or press working method. The forging apparatus and forging method are not limited to cold forging as in the above embodiment, but may also utilize, for example, hot forging. Hot forging is a processing technique in which a material is heated above its recrystallization temperature to soften it (red-hot state), and then pressure is applied with a mold to form it into a desired shape. The object manufactured by the forging apparatus and forging method is not limited to the heat sink 400A in the above embodiment, but may also be, for example, a member having a protruding part (such as a busbar or a metal part such as a connector).

[0056] The protruding portion is not limited to the fin 430A of the heat sink 400A in the above embodiment, but may also be, for example, a pin or a connecting terminal. The base member is not limited to the base member 400 in the above embodiment, but may also be, for example, a flat plate member without steps.

[0057] The slider is not limited to the annular-shaped slide die 130 of the above embodiment, but may also be a rectangular tubular slider, for example. The slider moving part is not limited to a configuration with a biasing member (back plate 180 and spring 190), but may also be a configuration without a biasing member. A configuration without a biasing member may include, for example, a drive source such as an electric motor and a moving device that moves the slider by the driving force of this drive source. The biasing member is not limited to a coil-shaped spring 190, but may also be a spring of a shape other than a coil (for example, a leaf spring), or an elastic body such as rubber. In the above embodiment, the number of springs 190 (biasing members) in the mold 102 may be more than 12, or it may be just one.

[0058] In the above embodiment, the punch 110 may be the lower die, and the die 120 and slide die 130 may be the upper die. The shape of the punch 110 may be other than a disc shape (for example, a rectangular plate shape). The shape of the pressing surface 112 of the punch 110 may be other than a circle (for example, a rectangle or polygon). The punch 110 may have a configuration that includes, for example, a main punch and a sub-punch arranged around the main punch and movable relative to the main punch in the vertical direction.

[0059] The die 120 may have a shape other than a prismatic shape (for example, a cylindrical shape). The first receiving surface 121 of the die 120 may have a shape other than a rectangle (for example, a circular shape). In the above embodiment, the molding die 102 was configured such that the molding hole 128 was formed in the first receiving surface 121, but it may also have a configuration in which the molding hole is formed in the pressing surface 112 and not in the first receiving surface 121, or a configuration in which the molding hole is formed in both the pressing surface 112 and the first receiving surface 121. The number of molding holes formed in the pressing surface 112 and the first receiving surface 121 may be one.

[0060] In the above embodiment, the clearance C was open laterally around the entire circumference of the mold 102, but it is not limited to this, and it is sufficient if at least a part of the periphery of the mold 102 (for example, near the part of the base member 400 that deforms relatively large when compressed) is open laterally. In the above embodiment, the mold 102 was configured to maintain the clearance C by sandwiching the base member 400 between the punch 110 and the slide die 130, but it is not limited to this, and for example, the clearance C may be maintained by sandwiching a different member other than the base member 400 between the punch 110 and the slide die 130, or a projection may be provided on at least one of the pressing surface 112 of the punch 110 and the second receiving surface 132 of the slide die 130, and the clearance C may be maintained by the projection.

[0061] In the above embodiment, before pressurization, the spring 190 may support the slide die 130 such that the second receiving surface 132 of the slide die 130 is at the same height as the first receiving surface 121 of the die 120. [Explanation of symbols]

[0062] 10: Forging system 100: Forging machine 102: Forming die 104: Drive unit 110: Punch 112: Pressing surface 120: Die 121: First receiving surface 123: First stepped surface 128: Forming hole 130: Slide die 132: Second receiving surface 133: Second stepped surface 134: Insertion hole 136: Fourth stepped surface 140: Guide die 144: Third stepped surface 146: Sixth stepped surface 150: Die case 154: Fifth stepped surface 160: Support member 170: Die spacer 174: Support spacer 180: Back plate 183: Housing chamber 190: Spring 400: Base member 400A: Heat sink 410: First base part 410A: Support part 420: Second base part 420A: Base part 430A: Fin C: Clearance D1: Clearance distance

Claims

1. A forging and pressing apparatus for forming a protrusion by applying pressure to a base member, It is a mold, A punch having a pressing surface, A die having a first receiving surface facing the central region of the pressing surface, A slider is provided, which has a second receiving surface facing the peripheral region of the pressing surface, the second receiving surface having a clearance between it and the pressing surface that is laterally open, and is arranged to be movable relative to the die in the direction in which the punch and the die face each other. The molding hole for forming the aforementioned protrusion is formed in the first receiving surface of the molding die, A punch moving unit that moves the punch toward the die, A slider moving unit moves the slider, which receives the pressing force from the punch during the movement process of the punch, relative to the die. A forging and pressing apparatus equipped with the following features.

2. A forging and pressing apparatus according to claim 1, The forging and pressing apparatus comprises a slider movement section having a biasing member that biases the slider toward the punch.

3. A forging and pressing apparatus according to claim 1 or claim 2, A forging and pressing apparatus, wherein, before the slider receives a pressing force from the punch, the slider moving part supports the slider such that the second receiving surface is located closer to the punch than the first receiving surface.

4. A forging and pressing apparatus according to claim 2, A forging apparatus, wherein the die has a stopper that stops the relative position of the slider with respect to the die at a reference position during the movement of the punch.

5. A forging process method for forming a protrusion by applying pressure to a base member, The central portion of the base member is positioned between the pressing surface of the punch and the first receiving surface of the die, which has a molding hole formed for forming the protrusion; the peripheral portion of the base member is positioned between the pressing surface and the second receiving surface of the slider. Move the punch toward the die side, A forging method comprising moving the slider, which receives the pressing force from the punch, relative to the die while maintaining a laterally open clearance between the pressing surface and the second receiving surface during the movement of the punch.

6. A forging process according to claim 5, A forging method in which the base member has a shape in which the first surface portion facing the first receiving surface protrudes more than the second surface portion facing the second receiving surface.

7. A forging process according to claim 6, A forging method comprising: positioning the second receiving surface so as to be closer to the punch than the first receiving surface before the slider receives the pressing force from the punch; and positioning the base member such that the first surface portion of the base member is located on the inner circumference side of the slider and the second surface portion is located on the second receiving surface.

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