JP6917289B2 - Forging equipment and forging method - Google Patents

Description

The present invention relates to a forging method and a forging apparatus for manufacturing a forged product with a convex portion such as a heat sink in which a plurality of convex portions such as fins are provided on a base plate, for example.

When a heat sink in which a large number of pin fins are integrally molded on a base plate is manufactured by mold forging, for example, the forging method shown in Patent Document 1 below is well known. As shown in FIG. 5A, the forging apparatus used in this method includes a punch 101 as an upper die and a die 102 as a lower die, and has a large number of fin forming holes 104 on the bottom surface of the forming recess 103 of the die 102. It is formed. Then, when the forging material is put into the molding recess 103 and the punch 101 is driven into the molding recess 103 to pressurize the forging material, the metal (metal material) M constituting the forging material plastically flows. By filling the cubicity formed between the punch tip surface and the bottom surface of the forming recess with the metal M, the base plate is formed and the fin forming hole 104 is filled with the metal M. , A large number of pin fins are formed. In this way, a heat sink in which a large number of pin fins are integrally molded on the base plate is manufactured.

JP 2015-50318

By the way, the conventional forging method shown in Patent Document 1 is so-called open forging, in which the clearance C between the outer peripheral side surface of the punch 101 and the inner peripheral side surface of the die forming recess 103 is large, and the metal M has a clearance during molding. It flows toward the C side and burrs are formed on the outer peripheral edge of the base plate. In such open forging, as shown in FIG. 5A during pressure molding, among the metal M filled in the cavity, a large number of metal flows M3 toward the clearance C in the metal M located at the outer peripheral edge portion are present. Of the fin forming holes 104, the pressure of the metal M corresponding to the fin forming holes 104 located at the outer peripheral edge portion is lower than the pressure of the metal M corresponding to the fin forming holes 104 located at the inner peripheral portion. Therefore, the metal flow M2 that penetrates into the fin forming hole 104 at the outer peripheral edge is slower than the metal flow M1 that penetrates into the fin forming hole 104 at the inner peripheral portion of the metal M. Therefore, the filling of the metal M into the fin forming hole 104 of the outer peripheral edge portion may be insufficient, and the fin height of the outer peripheral edge portion in the molded product becomes low due to the lack of meat, and sufficient processing accuracy cannot be obtained. There was a problem that there was a risk.

Further, in the conventional forging method shown in Patent Document 1, since the clearance C between the punch 101 and the die 102 is large, when the punch 101 is driven into the die 102, the punch 101 is not restrained by the die 102, and the punch 101 is formed. Positional deviation may occur with respect to the die 102. When the misalignment occurs in this way, the pressure balance of the metal M in the cavity is greatly disturbed, a large amount of thinning occurs, and there is a problem that the processing accuracy is further lowered.

On the other hand, as shown in FIG. 5B, a forging method by closed forging (closed forging) in which a clearance C is hardly provided between the punch 101 and the die 102 is also well known. In the forging apparatus used for such closed forging, since the punch 101 is restrained by the die 102, it is possible to prevent the punch 101 from being displaced with respect to the die 102.

However, in this forging method, since the outer peripheral side of the cavity is sealed and the fin forming hole 104 in the outer peripheral edge portion does not have the fin forming hole 104 formed on the outer side thereof, many metal Ms in the outer peripheral portion of the cavity are formed. Tries to penetrate into the fin forming holes 104 on the outer peripheral edge. On the other hand, since a large number of fin forming holes 104 are formed in the inner peripheral portion of the cavity, the metal M in the inner peripheral portion of the cavity tends to disperse and penetrate into each of the nearby fin forming holes 104. Therefore, in this closed forging, contrary to the above-mentioned open forging, the pressure of the metal M in the outer peripheral edge portion in the cavity is higher than the pressure of the metal M in the inner peripheral portion, so that the outer peripheral edge portion in the metal M The metal flow M1 penetrating into the fin forming hole 104 at the inner peripheral portion is slower than the metal flow M2 penetrating into the fin forming hole 104. As a result, the filling of the metal M into the fin forming hole 104 of the inner peripheral portion becomes insufficient, and the fin height of the inner peripheral portion of the molded product becomes low due to the lack of meat, and there is a possibility that sufficient processing accuracy cannot be obtained. There was a problem that there was.

In the open forging shown in FIG. 5A, it is theoretically possible to maintain a good pressure balance in the cavity by adjusting the clearance C between the punch 101 and the die 102. However, in reality, it is difficult to maintain the clearance C at the optimum value, such as a slight misalignment between the punch 101 and the die 102 each time the forging process is performed. At present, a plurality of clearances C having different clearances C are used. It is necessary to prepare the mold and frequently modify the mold to maintain the optimum clearance C. Since the adjustment of the clearance C requires a great deal of time and labor as described above, there arises a problem that the productivity is lowered and the cost is increased.

The present invention has been made in view of the above problems, and provides a forging processing method and a forging processing apparatus capable of obtaining sufficient processing accuracy, further improving productivity and reducing costs. The purpose is.

In order to solve the above problems, the present invention provides the following means.

[1] A die having a molding recess in which the forging material is installed and a punch for pressurizing and plastically deforming the forging material in the molding recess are provided, and a plurality of protrusions are provided on the inner peripheral portion on the base plate. It is a forging machine that manufactures forged products with convex parts by closed forging.
A convex molding hole for molding the convex portion is provided on the molding surface of the mold on one side of the die and the punch.
The portion of the mold on the other side corresponding to the inner peripheral portion of the base plate is configured as the main molded portion, and the portion corresponding to the outer peripheral portion of the base plate can freely advance and retreat with respect to the main molded portion in the pressurizing direction. Constructed as a low-pressure molded part,
When the forged material is pressed by the punch, the low-pressure molded portion is retracted in the anti-pressurizing direction against the urging force of the urging means with respect to the main molded portion, so that the die and the punch are separated from each other. A forging apparatus characterized in that, among metals as a forging material that plastically flows in a cavity for forming a base plate, the pressure of the metal corresponding to the outer peripheral portion of the base plate is reduced.

[2] The mold on one side is composed of the dice and
The forging apparatus according to item 1 above, wherein the mold on the other side is composed of the punch.

[3] The forging apparatus according to item 1 or 2 above, wherein the low-pressure forming portion in the mold on one side is provided so as to correspond to the entire circumference of the outer peripheral portion of the base plate.

[4] A plurality of the low-pressure molded portions are provided, and each low-pressure molded portion is individually provided against the main molded portion against the urging force of the urging means so as to be retractable in the anti-pressurizing direction. The forging processing apparatus according to any one of 1 to 3.

[5] The forging apparatus according to any one of items 1 to 4 above, wherein the convex forming hole is composed of fin forming holes for forming fins.

[6] The forging apparatus according to any one of items 1 to 5 above, wherein a heat sink is manufactured as the forged product with a convex portion.

[7] A plurality of convex portions on the inner peripheral portion on the base plate by closed forging using a die having a molding recess in which the forging material is installed and a punch that pressurizes and plastically deforms the forging material in the molding recess. It is a forging method for manufacturing a forged product with a convex portion provided with.
A convex molding hole for molding the convex portion is provided on the molding surface of the mold on one side of the die and the punch.
The portion of the mold on the other side corresponding to the inner peripheral portion of the base plate is configured as the main molded portion, and the portion corresponding to the outer peripheral portion of the base plate can freely advance and retreat with respect to the main molded portion in the pressurizing direction. Constructed as a low-pressure molded part,
When the forged material is pressed by the punch, the low-pressure molded portion is retracted in the anti-pressurizing direction against the urging force of the urging means with respect to the main molded portion, so that the die and the punch are separated from each other. A forging processing method characterized in that, among metals as a forging material that plastically flows in a cavity for forming a base plate, the pressure of the metal corresponding to the outer peripheral portion of the base plate is reduced.

According to the forging apparatus of the inventions [1] and [2], the low-pressure molded portion on the outer peripheral portion of the mold on the other side of the punch or the like is configured to be retractable in the counterpressurizing direction with respect to the main molded portion on the inner peripheral portion. When the forged material is pressed by the punch, the low-pressure molded portion is retracted to reduce the pressure of the metal on the outer peripheral portion in the cavity. The pressure of the metal can be adjusted almost evenly between the two, and the metal can be smoothly filled in each convex forming hole at a constant velocity. For this reason, metal can be sufficiently filled in all the convex forming holes, the occurrence of insufficient filling can be prevented, all the convex heights can be set uniformly, and high precision and high quality forging can be performed. A processed product can be reliably produced. Further, since the present invention is a closed forging in which the clearance between the die and the punch is not substantially formed, it does not require a great deal of time and labor for adjusting the clearance as in the open forging, and the productivity is improved by that amount. Cost can be reduced.

According to the forging apparatus of the invention [3], since the entire circumference of the mold on the other side is formed as a low-pressure molded portion, the pressure of the metal in the cavity can be adjusted evenly over the entire circumference. Metal can be more reliably filled in all the convex forming holes, and the processing accuracy can be further improved.

According to the forging apparatus of the present invention [4], since a plurality of low-pressure molded portions are provided, the metal pressure of the outer peripheral portion in the cavity can be adjusted for each low-pressure molded portion, and the pressure balance in the cavity can be finely adjusted. It can be adjusted and the processing accuracy can be further improved.

According to the forging apparatus of the inventions [5] and [6], it is possible to manufacture a heat sink in which fins are formed on a base plate.

According to the forging method of the invention [7], it is possible to reliably produce a forged product with high accuracy and high quality as described above, and it is possible to improve productivity and reduce costs.

FIG. 1 is a cross-sectional view schematically showing a forging machine according to an embodiment of the present invention. FIG. 2 is a cross-sectional view schematically showing a main part of the forging processing apparatus of the embodiment, FIG. 2A is a cross-sectional view in a state immediately before the start of molding, and FIG. 2B is a state immediately after pressurization of the forging material. (C) is a cross-sectional view of the forged material in a state where pressurization is in progress, FIG. (D) is a cross-sectional view immediately after the completion of molding, and FIG. It is a cross-sectional view. FIG. 3A is a surface view showing a heat sink manufactured by the forging apparatus of the embodiment. FIG. 3B is a side view showing the heat sink of the embodiment. FIG. 3C is a perspective view of the heat sink of the embodiment as viewed from the front surface side. FIG. 3D is a perspective view of the heat sink of the embodiment as viewed from the back surface side. FIG. 4A is a perspective view of a heat sink manufactured by the forging apparatus according to the first modification of the present invention as viewed from the back surface side. FIG. 4B is a perspective view of a heat sink manufactured by a forging apparatus according to a second modification of the present invention as viewed from the back surface side. FIG. 4C is a perspective view of a heat sink manufactured by a forging apparatus according to a third modification of the present invention as viewed from the back surface side. FIG. 4D is a perspective view of a heat sink manufactured by a forging apparatus according to a fourth modification of the present invention as viewed from the back surface side. FIG. 5A is a cross-sectional view schematically showing a conventional open forging type forging machine. FIG. 5B is a cross-sectional view schematically showing a conventional closed forging type forging machine.

1 and 2 are cross-sectional views schematically showing a die set (forging die) as a forging apparatus according to an embodiment of the present invention. In the present embodiment, the closed forging process is performed using the forging process devices shown in FIGS. 1 and 2, and as shown in FIGS. 3A to 3D, the forged product with fins (forged product with convex portion) is obtained. The heat sink 9 is manufactured.

First, the configuration of the heat sink 9 manufactured in the present embodiment will be described. As shown in FIGS. 3A to 3D, the heat sink 9 of the present embodiment includes a base plate 91 having a rectangular shape in a plan view. The entire circumference of the outer peripheral portion of the base plate 91 is configured as a flange portion 92, and the inner peripheral portion excluding the flange portion 93 is configured as a pin forming region 93. Further, a large number of pin fins 95 are integrally formed in the pin forming region 92 on the surface side of the base plate 91. Further, the flange portion 93 of the base plate 91 is formed with a bulging portion 94 so that the back surface side thereof bulges in the back surface direction, and the flange portion 93 is formed to be thicker than the pin forming region 92. .. In the present embodiment, the pin fin 95 constitutes the convex portion.

On the other hand, as shown in FIGS. 1 and 2, the forging apparatus of the present embodiment for manufacturing the heat sink 9 includes a die 1 as a lower die, an anvil 2 that supports the die 1 on an installation surface, and an upper portion. A punch 3 as a mold and a punch plate 4 for supporting the punch 3 are provided as basic components. In the present embodiment, the die 1 forms the mold on one side, and the punch 3 forms the mold on the other side.

The die 1 has a molded recess 11 formed in a downward recess on the upper surface side thereof. On the bottom wall of the molding recess 11 of the die 1, a large number of fin molding holes 12 are formed corresponding to a large number of pin fins 95 of the heat sink 9 as a forged product. Each fin forming hole 12 is formed so as to penetrate the bottom wall of the forming recess 11 in the vertical direction, the upper end of each fin forming hole 12 is opened to the bottom surface of the forming recess 11, and the lower end is formed on the lower surface of the die. It is open. In the present embodiment, the fin forming holes 12 form the convex forming holes.

Further, knock pins 15 are housed in the fin forming holes 12 of the die 1 so as to be able to move up and down along the vertical direction.

The inside of the anvil 2 that supports the die 1 penetrates in the vertical direction, and a pin plate 21 is vertically attached to the through hole in the vertical direction. The lower end of the knock pin 15 is supported by the pin plate 21, and the pin plate 21 is connected to an ejector (not shown) via a rod 22. The pin plate 21 is configured to move up and down together with the knock pin 15 by moving the rod 22 up and down by driving the ejector.

The punch 3 is configured to be able to be driven into the molding recess 11 of the die 1, and when the punch 3 is driven into the molding recess 11, the molding surface of the die 1 (bottom surface of the molding recess) and the molding of the punch 3 are formed. A cavity 10 for forming the base plate 91 of the heat sink 9 is formed between the surface (lower end surface).

In the present embodiment, the punch 3 corresponds to the rectangular main molded portion 32 in a plan view corresponding to the pin forming region 92 of the heat sink 9 as a forged product, and the flange portion 93 of the heat sink 9, and the main molded portion 32. It is provided with a square tubular (planar viewing angle annular) low pressure forming portion 33 arranged on the outer periphery. The low-pressure molding portion 33 is fitted onto the main molding portion 32 so as to be slidable (advance and retreat) along the vertical direction (pressurization direction).

The main molding portion 32 is supported on the lower surface of the punch plate 4, and the low pressure molding portion 33 is supported on the lower surface of the punch plate 4 via a coil spring 35. In the present embodiment, the coil spring 35 constitutes an urging means for urging the low-pressure forming portion 33 in the pressurizing direction (downward direction) by elastically compressing and deforming. As will be described later, in the present invention, the urging means is not limited to springs such as coil springs.

Further, the punch plate 4 is configured to be vertically driven up and down by driving a driving means such as a press machine (not shown), and the main forming portion 32 and the low pressure forming portion 33 as the punch 3 move up and down in conjunction with this up and down movement. It is configured as follows. When the punch 3 is lowered, the tip portion (lower end portion) of the punch 3 is inserted into the molding recess 11 of the die 1, and the forging material W in the molding recess 11 is pressurized as described later. It is designed to be plastically deformed. The forging device of the present embodiment is a closed forging type in which a clearance is not substantially formed between the outer peripheral side surface of the punch 3 and the inner peripheral side surface of the die forming recess 11.

In the forging apparatus of the present embodiment configured as described above, before starting molding, a lubricant is applied to the dies such as the die 1 and the punch 3 as necessary, and heat treatment is performed. However, it is not always necessary to apply these lubricants or heat-treat them.

In the present embodiment, the material of the forging material W is not particularly limited, but aluminum, copper, iron (including alloys thereof) and the like are often used, and a material having particularly high thermal conductivity is preferably used.

Further, the shape of the forging material W is not particularly limited, and any shape such as a rectangular shape, a circular shape, and a different shape in a plan view may be used, but the plane shape is the plane shape of the die forming recess 11. It is better to use the rectangular one corresponding to. In particular, it is preferable to use the forging material W having a shape that allows it to be arranged in the molding recess 11 without a gap. That is, when the forging material W that can be arranged in the molding recess 11 without a gap is used, the forging material W is positioned with respect to the molding recess 11, so that the forging material W can be prevented from being displaced at the time of punching, and the height is high. Forging can be performed with high accuracy. Here, in the present embodiment, the state in which the forging material W can be arranged in the molding recess 11 without a gap is specifically that the distance between the outer peripheral end surface of the forging material W and the inner peripheral side surface of the molding recess 11 is 3 mm or less. It is preferably the case where it is adjusted to 2 mm or less.

Further, the manufacturing method of the forged material W is not particularly limited, and is obtained by trimming or machining from a rolled material, cutting a flat or round extruded material, or continuously casting a square or round shape. Cut or cut out rods are preferred.

Further, the forged material W may be subjected to an annealing treatment (O treatment) or a lubrication treatment for adhering a lubricant to the surface of the material. Further, the annealing treatment for the forged material W may be performed after the lubrication treatment.

When aluminum is used as the forging material W, it is preferable to heat the forging material W in advance. This heating temperature is not particularly limited, but it is preferable to heat to about 400 ° C. to 600 ° C. However, in the present invention, the forging material W may be cold forged without being heated.

In the present embodiment, as the forging material W, a hexahedral shape (rectangular plate shape) that matches the shape of the cavity 10 is adopted. The hexahedral forged material W may be chamfered at the corners if necessary.

When the production of the heat sink 9 is started by the forging apparatus of the present embodiment, as shown in FIG. 2A, the punch 3 is raised, and the knock pins 15 are moved to a predetermined position (fin height) by lowering the pin plate 21. It is lowered to the position corresponding to the heat sink), and the upper part of each pin forming hole 12 is left open by the amount corresponding to the fin height. As will be described later, when back pressure forging is performed in each pin forming hole 12, each knock pin 15 is arranged at a position higher than the predetermined position.

In this state, the forging material W is put and installed in the molding recess 11 of the die 1. After that, as shown in FIG. 3B, the punch 3 is lowered to pressurize the forging material W, and the metal (metal material) M constituting the forging material W is plastically flowed. At the time of this pressurization, as shown in FIG. It descends while retreating in the pressurizing direction). Here, in the present embodiment, when the low-pressure forming portion 33 is retracted with respect to the main forming portion 32, when the main forming portion 32 is lowered and the low-pressure forming portion 33 is raised with respect to the die 1, the die 1 is used. On the other hand, when the low-pressure forming portion 33 is stopped while the main forming portion 32 is descending, the low-pressure forming portion 33 is descending at a lower speed than the main forming portion 32 while the main forming portion 32 is descending with respect to the die 1. In any case of.

As the punch 3 descends while the low-pressure forming portion 33 retracts with respect to the main forming portion 32 in this way, the portion corresponding to the low-pressure forming portion 33 in the cavity 10 (the portion corresponding to the flange portion 93 of the base plate 91). In a state where the pressure of the metal M is reduced, the metal M in the cavity 10 is filled into each fin forming hole 12. As a result, among the metal M in the cavity 10, the pressure of the metal M corresponding to the fin forming hole 12 in the outer peripheral portion and the pressure of the metal M corresponding to the fin forming hole 12 in the inner peripheral portion are balanced. Then, the metal M is filled in each fin forming hole 12 with substantially equal pressure. Therefore, as shown in FIG. 3D, regardless of the position of the fin forming holes 12, the metal M is filled in each fin forming hole 12 at a constant velocity, and the metal M is filled in the fin forming hole 12 and the like in the inner peripheral portion. It is possible to prevent problems such as insufficient filling of M from occurring, and all the fin forming holes 12 are surely filled with metal M.

On the other hand, as the low-pressure forming portion 33 of the punch 3 moves upward, a gap portion is formed above the outer peripheral portion in the cavity 10, but the gap portion is also filled with the metal M, which is described above. A bulging portion 94 is formed on the back surface side of the flange portion 92 in the heat sink 9.

When back pressure forging is performed in the fin forming holes 12, each knock pin 15 is arranged at a high position as described above, and when the metal M is filled in each fin forming hole 12, at the time of filling. While receiving the pressure of the metal M (while applying the back pressure), each knock pin 15 is lowered together with the pin plate 21.

In this way, the cavity 10 and the fin forming hole 12 are filled with the metal M, and the forged product (forged material) constituting the heat sink 9 is formed.

After that, as shown in FIG. 3E, after raising the punch 3, each knock pin 15 is raised together with the pin plate 21 to push up the forged product (heat sink 9) from the die forming recess 11 to form a forged element. Drain the material from die 1.

In the present embodiment, forged products are sequentially manufactured as shown in FIGS. 3A to 3D by repeatedly performing such an operation.

The forged product (forged material) obtained in this way may be used as it is as a final product without being processed as it is, but usually it is machined such as cutting to make it a final product. Is.

When processing the forged material, for example, in the flange portion 92, the bulging portion 94 on the back surface side is cut as a burr by cutting or the like to form the flange portion 92 into a thin wall, or the entire flange portion 92 or the flange portion 92 is formed. A part of it is cut as a burr by cutting.

As described above, according to the forging apparatus of the present embodiment, the low-pressure forming portion 33 on the outer peripheral portion of the punch 3 is configured to be retractable with respect to the main forming portion 32 on the inner peripheral portion in the counterpressurizing direction, and the punch is punched. When the forging material W is pressurized by 3, the low-pressure forming portion 33 is retracted to reduce the pressure of the metal M on the outer peripheral portion in the cavity 10, so that the outer peripheral portion and the inner portion in the cavity 10 are reduced. The pressure of the metal M can be adjusted substantially evenly with the peripheral portion, and the metal M can be smoothly filled in all the fin forming holes 12 at a constant velocity. Therefore, the metal M can be sufficiently filled in all the fin forming holes 12, the occurrence of insufficient filling can be prevented, and the fin heights in the heat sink 9 can be set uniformly, and the fin height is highly accurate and high. A quality heat sink 9 can be reliably manufactured.

Further, in the forging apparatus of the present embodiment, since the entire outer peripheral portion (entire circumference) of the punch 3 is formed as the low pressure forming portion 33, the pressure of the metal M in the cavity 10 is uniformly adjusted over the entire circumference direction. The metal M can be more reliably filled in all the fin forming holes 12, the processing accuracy can be further improved, and the quality of the heat sink 9 can be further improved.

Further, since the forging apparatus of the present embodiment performs closed forging, there is almost no clearance between the die 1 and the punch 3, and when the punch 3 is driven into the die 1, the position of the punch 3 with respect to the die 1 is accurate. Can be done. Therefore, the processing accuracy can be improved also in this respect, and the heat sink 9 of even higher quality can be manufactured.

Further, since the forging apparatus of the present embodiment performs closed forging in which the clearance between the die 1 and the punch 3 is not substantially formed, a large amount of time and labor is required to adjust the clearance as in the open forging. However, it is possible to improve productivity and reduce costs accordingly.

In the above embodiment, the entire outer peripheral portion of the punch 3 is formed on the low pressure forming portion 33, but the present invention is not limited to this, and in the present invention, the low pressure forming portion 33 is formed on a part of the outer peripheral portion of the punch 3. It may be formed, or a plurality of low-pressure molded portions 33 may be formed. For example, by configuring two of the four peripheral sides of the punch 3 that face each other as low-pressure forming portions 33 that can individually recede in the counterpressurizing direction against the urging force of the urging means. As shown in 4A, a forged product (heat sink 9) in which a bulging portion 94 is formed on two opposing sides of the peripheral four sides of the rectangular base plate 91 on the back surface side so as to bulge toward the back surface side. May be manufactured. Further, by configuring the four peripheral sides of the punch 3 as low-pressure molded portions 33 that can be individually retracted, any of the four peripheral sides of the rectangular base plate 91 on the back surface side facing each other as shown in FIG. 4B. A forged product (heat sink 9) is manufactured in which a bulging portion 94a that greatly bulges toward the back surface side and a bulging portion 94b that slightly bulges on the remaining two opposite sides are formed on the two sides. You may. Further, as shown in FIG. 4C, the back surface side of the rectangular base plate 91 is formed by forming two low-pressure molded portions 33 that can be individually retracted from each of the two opposing sides of the four peripheral sides of the punch 3. A forged product (heat sink 9) in which bulging portions 94 are formed at two locations on each of the two opposing sides of the four peripheral sides in the above may be manufactured. Further, by forming a portion slightly inside the outer peripheral edge of the punch 3 as a low-pressure molded portion 33 having an annular plan view angle, as shown in FIG. 4D, a little inside from the outer peripheral edge on the back surface side of the rectangular base plate 91. A forged product (heat sink 9) in which a bulging portion 94 having an annular plan view angle is formed may be manufactured.

As shown in FIGS. 4A to 4C, when a plurality of low-pressure forming portions 33 in the punch 3 are provided so as to be individually movable, each low-pressure forming portion 33 has an outer peripheral portion in the cavity 10. The pressure of the metal M can be adjusted. Therefore, the pressure balance of the metal M in the cavity 10 can be finely adjusted, and the processing accuracy can be further improved.

Further, in the above embodiment, the case where the base plate 91 manufactures the rectangular heat sink 9 has been described as an example, but the present invention is not limited to this, and in the present invention, the shape of the base plate of the forged product to be manufactured is limited. It is not something that is done. For example, a forged product having a base plate having a polygonal shape, a circular shape, an elliptical shape, or a different shape may be manufactured. Needless to say, the die molding recesses and punches are designed according to the shape of the base plate of the forged product to be manufactured.

Further, in the present embodiment, the coil spring 35 is illustrated as the urging means, but the urging means is not particularly limited in the present invention, and the forging material W is pressed by the punch 3 as described above. When the low-pressure forming portion 33 retreats (rises) with respect to the main molding portion 32 in the counterpressurizing direction, any means can be used as long as it can apply an urging force in the advancing direction (downward) while receiving the pressure in the retreating direction. May be adopted. For example, as the urging means other than the coil spring 35, a gas spring, a hydraulic cylinder attached to a press machine or the like, a pneumatic cylinder, a servomotor or the like can be used. When the urging means attached to the press machine is used, the urging force (pressure) can be arbitrarily adjusted by changing the setting conditions of the press machine. Further, even when an urging means such as a spring or a gas spring that is not attached to the press machine is used, the urging force can be easily adjusted by changing the size, type, or the like.

Further, in the above embodiment, the case where the heat sink 9 having the pin fins 95 is manufactured has been described as an example, but the present invention is not limited to this, and the shape of the fins formed on the heat sink is not particularly limited in the present invention. do not have. For example, the shape of the fin may be formed into a plate fin such as a rectangular plate shape, a disk shape, or an elliptical plate shape, a block-shaped fin such as a cube shape or a rectangular parallelepiped shape, a fin having an irregular shape such as a wing shape, or the like. ..

Further, in the above embodiment, the case where the heat sink 9 having fins is manufactured as a forged product has been described as an example, but the present invention is not limited to this, and in the present invention, a plurality of convex portions other than fins are formed on the base plate. The forged product may be manufactured.

Further, in the above embodiment, when the mold on one side is used as the die 1 and the mold on the other side is used as the punch 3, that is, the fin forming hole 12 is formed on the die 1 side and the low pressure forming portion 33 is provided on the punch 3 side. Forging processing in which fins (convex portions) are formed by forward extrusion by forming is described as an example, but the present invention is not limited to this, and in the present invention, one side mold is used as a punch and the other side mold is used. May be configured as a die. That is, in the present invention, a fin forming hole (convex forming hole) is formed on the tip surface of the punch, and the outer peripheral portion of the bottom wall of the forming recess in the die can be retracted in the antipressurizing direction (downward direction). Forging may be performed so as to form fins (convex portions) by rearward extrusion.

The forging apparatus of the present invention can be suitably used when manufacturing a forged product with a convex portion such as a heat sink in which a large number of fins such as pin fins are provided on a base plate.

1: Die 10: Cavity 11: Molding recess 12: Fin molding hole (convex molding hole)
3: Punch 32: Main molding part 33: Low pressure molding part 35: Coil spring (urging means)
9: Heat sink (forged product with convex part)
91: Base plate 92: Flange portion (outer peripheral portion of base plate)
93: Pin forming region (inner circumference of base plate)
95: Pin fin (convex part)
M: Metal W: Forged material

Claims (7)

It is equipped with a die having a molding recess in which the forging material is installed and a punch that pressurizes and plastically deforms the forging material in the molding recess, and has a convex portion provided with a plurality of convex portions on the inner peripheral portion on the base plate. It is a forging machine that manufactures forged products by closed forging.
A convex molding hole for molding the convex portion is provided on the molding surface of the mold on one side of the die and the punch.
The portion of the mold on the other side corresponding to the inner peripheral portion of the base plate is configured as the main molded portion, and the portion corresponding to the outer peripheral portion of the base plate can freely advance and retreat with respect to the main molded portion in the pressurizing direction. Constructed as a low-pressure molded part,
When the forged material is pressed by the punch, the low-pressure molded portion is retracted in the anti-pressurizing direction against the urging force of the urging means with respect to the main molded portion, so that the die and the punch are separated from each other. A forging apparatus characterized in that, among metals as a forging material that plastically flows in a cavity for forming a base plate, the pressure of the metal corresponding to the outer peripheral portion of the base plate is reduced. The mold on one side is composed of the dice and
The forging apparatus according to claim 1, wherein the mold on the other side is composed of the punch. The forging apparatus according to claim 1 or 2, wherein the low-pressure molding portion in the mold on one side is provided corresponding to the entire circumference of the outer peripheral portion of the base plate. A plurality of the low-pressure molded portions are provided, and each of the low-pressure molded portions is individually provided against the main molded portion against the urging force of the urging means so as to be retractable in the anti-pressurizing direction. The forging processing apparatus according to any one of 3. The forging apparatus according to any one of claims 1 to 4, wherein the convex forming hole is composed of a fin forming hole for forming a fin. The forging apparatus according to any one of claims 1 to 5, wherein a heat sink is manufactured as the forged product with a convex portion. A plurality of convex portions are provided on the inner peripheral portion on the base plate by closed forging using a die having a molding recess in which the forging material is installed and a punch that pressurizes and plastically deforms the forging material in the molding recess. It is a forging method that manufactures forged products with convex parts.
A convex molding hole for molding the convex portion is provided on the molding surface of the mold on one side of the die and the punch.
The portion of the mold on the other side corresponding to the inner peripheral portion of the base plate is configured as the main molded portion, and the portion corresponding to the outer peripheral portion of the base plate can freely advance and retreat with respect to the main molded portion in the pressurizing direction. Constructed as a low-pressure molded part,
When the forged material is pressed by the punch, the low-pressure molded portion is retracted in the anti-pressurizing direction against the urging force of the urging means with respect to the main molded portion, so that the die and the punch are separated from each other. A forging processing method characterized in that, among metals as a forging material that plastically flows in a cavity for forming a base plate, the pressure of the metal corresponding to the outer peripheral portion of the base plate is reduced.

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