JP5572477B2 - Cam device, drilling device and closed forging device provided with the same - Google Patents

Description

  The present invention relates to a cam device, a drilling device including the cam device, and a closed forging device.

  Conventionally, cam devices that are used to process forged products with complex shapes such as crankshafts and connecting rods can be quickly drilled while the workpiece for molded products is heated to some extent, and then formed into the desired shape. Must. For this purpose, cam devices are densely arranged around the work for the forged product, and the forged product is being completed with as few steps as possible. As such a forging device, a closed forging device described in Patent Document 1 is known.

Japanese Patent Laid-Open No. 06-344074

  However, in the processing of the workpiece, the punching of the cam device has a high processing force, and the piercing punch needs strength, and there is a restriction that the workpiece is set to be processed symmetrically from both sides thereof. Yes, there is a limitation that machining can be completed in one shot, and if the shape of the workpiece becomes complicated, there is a disadvantage that the conventional cam device cannot be arranged at high density. It is impossible to respond due to interference. Therefore, there is a need for a cam device that completes the necessary processing in one shot and can handle high-density arrangement. The cam device according to the present invention, the drilling device and the closed forging device provided with the cam device are proposed in order to solve such problems.

The gist for solving the above-mentioned problems of the cam device according to the present invention is to provide between a lower mold and a mold composed of an upper mold that can be moved up and down with respect to the lower mold. Being
A cam driver having a cam surface that is fixedly attached to the upper mold and moved into the mold;
A cam slider that has a cam surface that is in sliding contact with the cam surface of the cam driver, and is slidably supported so as to move into the mold by the vertical movement of the upper mold;
A tool that is fixedly attached to the tool mounting surface of the cam slider and that processes a part of the workpiece into a desired shape;
A return device for moving the cam slider from the processing position to the original initial state to the outside of the mold by the biasing means;
In a cam device comprising a cam base that slidably supports the cam slider and is fixed to the lower mold,
The cam surface of the cam driver and the cam surface of the cam slider are cam-operated by sliding the cam surfaces between the upper die from the top dead center to the bottom dead center. When the cam surface further descends, the cam surfaces are disengaged from each other,
When the upper mold returns from the bottom dead center to the top dead center, the cam surface of the cam driver and the cam surface of the cam slider do not collide with each other so that either one of the cam surfaces is retracted from the collision range. In order to retract the surface, the cam surface of the cam slider is provided on one end side of the cam roller which is a rod-like body connected to the cam slider body so that it can swing within a required range separately from the cam slider body. A retracting device is provided, and
The cam roller is swung up when moving from the bottom dead center to the top dead center on the cam surface of the cam driver, and then swings by its own weight to return to the original position.

A taper portion is provided on the lower surface of the cam portion on which the cam surface of the cam slider is formed, and a taper portion is provided on the upper surface of the cam portion on which the cam surface of the cam driver is formed. Both taper portions have the same taper angle. The taper surface of the forcible return member and the side surface of the return pin are not in contact with each other so that the forcible return is surely performed when both the tapered portions come into slidable contact with each other. That is, a slight gap is provided.

  In the mounting base portion of the cam driver, the supporting portion extending from the mounting base portion, and the cam surface formed at the end portion of the supporting portion, the cam portion of the cam slider moves to the outside of the mold. In other words, it avoids a collision when returning to the initial position, and is retracted to the outside of the mold from the position of the cam surface of the cam driver.

  A forced return device for returning the cam slider to the outside of the mold when the both cam surfaces are disengaged is provided with a return pin projecting on the side surface of the cam slider, and a mold in contact with the side surface of the return pin. And a forcible return member that has a tapered surface for moving the cam slider to the outside and is attached and fixed to the upper die.

A tapered portion is provided on the lower surface of the cam portion on which the cam surface of the cam slider is formed, and a tapered portion is provided on the upper surface of the cam portion on which the cam surface of the cam driver is formed. Both the tapered portions have the same taper angle. It is formed so as to be slidable, and it does not contact between the taper surface of the forcible return member and the side surface of the return pin so that the forced return is surely performed when both the taper portions come into slidable contact. Is provided with a slight gap.

  A second cam driver that is mounted and fixed to the upper mold and a second cam slider that is moved into the mold by the second cam driver to process the workpiece with a tool and are slidably supported by the cam base are provided side by side. The double-acting cam device is configured so that the machining time of the cam slider by the tool and the machining time of the second cam slider by the tool are set to be different.

  The cam slider and the second cam slider are arranged side by side in contact with each other side surface, and an intermediate plate receiving a side pressure is interposed between the both side surfaces in contact with each other.

  The gist of the drilling device according to the present invention is that a plurality of cam devices according to the present invention are installed in any combination between the upper mold and the lower mold, and the machining tool is used as a punch for drilling. That is.

Moreover, the gist of the closed forging device according to the present invention is a device for closing and forging a crankshaft, which is a die comprising a lower die and an upper die provided to be movable up and down with respect to the lower die, and the die A plurality of cam devices according to the present invention provided in the above-mentioned , and when the crankshaft is closed and forged, the tool of the cam device forms a plurality of holes in the pin portion of the crankshaft in one step. A forging device, wherein when the upper die relatively approaches the lower die, a cam slider tool of the cam device is moved into the die to form one hole of the crankshaft. By moving the upper mold and the lower mold relatively closer to each other than the state in which the mechanism of the cam slider tool is advanced, the second cam slider tool is moved into the mold, and the other hole of the crankshaft is moved. Molding part A first cam mechanism, wherein the first cam mechanism moves the cam slider into the mold and moves the upper mold and the lower mold relatively closer to each other than when the one hole is molded. One cam mechanism is disengaged, and the cam slider moves to the outside of the mold by an internal elastic body, so that the tool of the cam slider and the other cam device crossing the tool of the cam slider A two-cam slider tool is provided with a retracting mechanism that does not interfere with a shift in processing time, and a plurality of the cam devices are provided symmetrically on the crankshaft.

  The first cam mechanism includes a cam driver having a curved surface and a cam slider having a curved surface and including a link member.

  According to the cam device of the present invention, when drilling a workpiece having a complicated shape, in one step of the mold, the processing tools such as punches are in the same plane when processing a desired portion. Even in the case of crossing, the two motions are applied with a time difference so that they do not collide, enabling short-term closed forging of the workpiece.

The retraction device provided in the cam device acts as a cam when descending from the top dead center of the upper mold to the bottom dead center, but when returning from the bottom dead center of the upper mold to the top dead center, Since it is retracted so as to avoid it, two motions of the cam device in one upper mold process are possible.
Further, in the retracting device, the cam roller that swings and retracts is returned to its original position by its own weight, so that the structure is simplified and the number of parts can be reduced.

  The mounting base portion of the cam driver and the support portion extending from the mounting base are configured so that the cam surface of the cam driver avoids a collision when the cam surface of the cam slider moves outside the mold and returns to the initial position. The cam slider can be reliably returned to the original position because the cam slider is retracted to the outside of the mold rather than the position.

  A forced return device for returning the cam slider to the outside of the mold when the both cam surfaces are disengaged is provided with a return pin projecting on the side surface of the cam slider, and a mold in contact with the side surface of the return pin. And a forcible return member that has a taper surface for moving the cam slider to the outside and is attached and fixed to the upper mold, so that the return device acts reliably, and collision of the processing tool is avoided and safety is improved. improves.

  A second cam driver that is attached and fixed to the upper mold and a second cam slider that is moved into the mold by the second cam driver to process the workpiece with a tool and are slidably supported by the cam base are provided side by side. This is a double-acting cam device, and the machining time of the cam slider tool and the machining time of the second cam slider tool are set to be different. The high-density arrangement enables simultaneous machining at a plurality of locations and enables closed forging.

  The cam slider and the second cam slider are juxtaposed in contact with each other on one side surface, and an intermediate plate that receives side pressure is interposed between the both side surfaces in contact with each other. Smooth slidability is guaranteed.

  In the drilling device according to the present invention, a plurality of cam devices are installed in any combination between the upper mold and the lower mold, and the machining tool is used as a punch for drilling. It is possible to perform complicated processing in one process by shifting the position.

According to the closed forging device according to the present invention, the cam device is provided with the plurality of cam devices provided in the mold, and when the crankshaft is closed forged, the tool of the cam device has a plurality of holes in the pin portion of the crankshaft. This is a closed forging device that forms a part in a single step, and the first cam mechanism that forms one hole of the crankshaft and the upper die and the lower die are relatively closer to each other than the advanced state of the cam slider tool. A second cam mechanism that molds the other hole of the crankshaft, the engagement of the first cam mechanism is released, and the cam slider moves to the outside of the mold by an internal elastic body. Thus, the cam slider tool and a second cam slider tool of another cam device that intersects the cam slider tool are provided with a retracting mechanism that does not interfere due to a shift in processing time, Since beam device is provided with a plurality symmetrically to the crankshaft, it is possible to closed forging a crankshaft of complex shape.
In addition, since the first cam mechanism is configured by a cam driver having a curved surface and a cam slider having a curved surface and configured by a link member, the retracting mechanism can be configured easily and at low cost. There are many excellent effects as described above.

It is the perspective view (A) from the diagonal top of the top dead center position of the cam apparatus 1 which concerns on this invention, and the perspective view (B) from the diagonal top of the top dead center position. It is a perspective view (A) figure of the cam apparatus 1 which concerns on this invention, a top view (B), and a perspective view (C) in the middle of the rising toward a top dead center position from a bottom dead center position. They are a side view (A), a partial plan view (B), a side view (C), a front view (D), and a bottom view (E) of the bottom dead center position of the cam device 1 according to the present invention. It is the exploded perspective view of the cam apparatus 1 which concerns on the same invention, Comprising: The perspective view (A) of what is fixed to an upper mold | type, The perspective view (B) from the front of the 1st cam slider 3 and the 2nd cam slider 8, A perspective view from the rear (C), a perspective view (D) of the shared cam base 4, a perspective view from above (E), and a perspective view (F) from below. In the cam device 1, a side view (A), a perspective view (B), and a first cam slider 3 showing the state immediately before the cam member 2 b and the cam roller 9 are disengaged when the upper die is in the intermediate position. It is a side view (C) which shows a mode that the 1st forced return member 5 just before returning to this position contact | abuts to the return pin 10. FIG. It is explanatory drawing which shows operation | movement of the cam apparatus 1 which concerns on this invention, and an upper mold | type is a front view (A), side view (B), (C) of a top dead center position. It is explanatory drawing which shows operation | movement of the cam apparatus 1 which concerns on the same invention, and an upper mold | type is a front view (A), side view (B), (C) of an intermediate position. FIG. 6 is an explanatory view showing the operation of the cam device 1 according to the present invention, in which the upper die is in an intermediate position, the engagement between the cam member 2b and the cam roller 9 is released, and the die 1 cam slider 3 is returned to the original position; It is a front view (A), a side view (B), and (C) in a state where the cam slider 8 starts to move. It is explanatory drawing which shows operation | movement of the cam apparatus 1 which concerns on the same invention, Comprising: The upper mold | type is a front view (A), side view (B), (C) of a bottom dead center position. It is explanatory drawing which shows operation | movement of the cam apparatus 1 which concerns on the same invention, and is a front view which shows the state which is raising the cam roller 9 with the cam member 2 in the middle of the upper mold | type from the bottom dead center position to a top dead center position ( A) and side views (B) and (C). It is explanatory drawing which shows operation | movement of the cam apparatus 1 which concerns on the same invention, The side perspective view which shows the state which the cam roller 9 is flipped up by the cam member 2 in the middle of the upper mold | type from a bottom dead center position to a top dead center position FIG. 2A is a perspective view seen from above, FIG. 3B is a perspective view of the entire mold provided with cam devices 1a and 1b. FIG. 2 is a plan view of a closed forging device 19 in which cam devices 1a and 1b are disposed in the vicinity of a lower die 15 of a mold. The upper die of the closed forging device 19 is an overall perspective view (A) at the top dead center position, an overall perspective view (B) at the intermediate position, the first cam slider 3 is returned, and the second cam slider 8 is moved. An overall perspective view of the top dead center position (C), and the upper mold is an overall perspective view of the bottom dead center position (D).

  As shown in FIG. 1-A, a cam device 1 according to the present invention includes a cam provided with a tool for drilling or bending while an upper mold of a mold reaches from a top dead center position to a bottom dead center position. The slider moves forward in the machining direction and finishes machining, and then is returned to the original position by the return device for return, and at the same time, machining of another tool that intersects the machining axis of the tool. The forward movement in the direction is possible, and two motions are possible in one process. By providing a plurality of such cam devices 1, the drilling device or the closed forging device can be constructed in a single process, rather than being divided into a plurality of processes, which has been difficult in the past. It is what you want to do.

  The configuration of the cam device 1 will be described with reference to FIGS. This cam device 1 is, for example, between a lower die (not shown) in a closed forging die and an upper die (not shown) provided to be movable up and down with respect to the lower die. As a first cam mechanism, there is a first cam driver 2 which is a cam driver having a cam surface 2c which is fixedly attached to the upper mold with a bolt or the like and which is moved into the mold. The cam surface 2c has an arcuate curved shape with a radius r. Of course, the shape is not limited to this, and a flat cam surface may be used.

  A cam roller 9 having a cam surface 9a that is in sliding contact with the cam surface 2c of the first cam driver 2 is held by a link mechanism, and is slidably supported so as to move into the mold by the vertical movement of the upper mold. There is a first cam slider 3 that is a cam slider. The cam surface 9a of the cam roller 9 has an arc shape, and is slidably in contact with the cam surface 2c to perform a cam action. In addition, the cam driver and the cam slider are set to the first, respectively, because the cam device 1 according to this embodiment includes a plurality of first cam mechanisms and second cam mechanisms. Attached.

  A first tool 6a that is fixedly attached to the tool mounting surface of the first cam slider 3 of the first cam mechanism and that processes a part of the workpiece into a desired shape, and the first cam slider 3 is moved from the processing position to the original initial state. And a return device that moves to the outside of the mold by a biasing means 13 such as a gas spring or a coil spring, and a common that is fixed to the lower mold while supporting the first cam slider 3 slidably in the machining direction. Cam base 4.

  The cam surface 2c of the first cam driver 2 and the cam surface 9a of the first cam slider 3 are connected between the upper dead center and the bottom dead center of the upper die. The cam surface 2c of the first cam driver 2 is further lowered after the sliding contact, and the cam surface 2c of the first cam driver 2 is further lowered after the sliding contact. Is disengaged (lowers further from the state shown in FIG. 4). The first cam slider 3 is returned to the initial state by the biasing means 13 of the return device immediately after the cam surfaces 2c and 9a are disengaged from each other.

  Then, when the upper mold returns from the bottom dead center to the top dead center, either the cam surface 2c of the first cam driver 2 and the cam surface 9a of the first cam slider 3 do not collide with each other and are not damaged. In this first embodiment, a retracting device for retracting the cam surface 9a by a link mechanism is provided so that the cam surface is retracted from the collision range.

  In the retracting device, the cam surface 9a of the first cam slider 3 is separated from the cam slider body 3a so that the cam surface 9a can swing within a required range (approximately 90 ° upward from the horizontal state). It is provided on one end side of the cam roller 9 which is a connected rod-like body.

  The cam roller 9 is a cam surface 2c of the first cam driver 2, and when the first cam driver 2 is moved from the bottom dead center position to the top dead center position by the upper mold, the cam roller 9 jumps upward from the horizontal state. After that, it swings with its own weight and returns to the original horizontal position. Since the cam roller 9 swings in a range from a horizontal state to a substantially vertical state in a state where the cam device 1 is attached to the mold, when the cam roller 9 returns to the horizontal state as shown in FIG. In order to reduce the impact of the collision with the cam slider body 3a, a cushioning material 14c is provided.

  Further, as shown in FIG. 1-A or FIG. 2, in the first cam driver 2, an attachment base portion 2d to the upper mold, a support portion 2a extending from the attachment base portion 2d, and an end portion of the support portion 2a And the cam surface 2c formed on the first cam slider 2a, avoiding a collision when the cam surface 9a of the first cam slider 3 moves out of the mold and returns to the initial position. The driver 2 is retracted to a position outside the mold from the position of the cam surface 2c of the driver 2. As another embodiment, if there is no problem in strength with respect to the support portion 2a that supports the cam member 2b, the support portion 2a is retracted to a lateral position orthogonal to the outer direction, not to the outer position of the mold. May be.

  FIG. 1 shows a forcible return device for returning the first cam slider 3 to the outside of the mold when the cam surfaces 2c and 9a are disengaged (at the middle of the path from the top dead center to the bottom dead center). As shown in -A, a return pin 10 protruding from the side surface of the first cam slider body 3a and a taper that contacts the side surface of the return pin 10 and moves the first cam slider 3 to the outside of the mold. The first forced return member 5 has a surface 5a and is attached and fixed to the upper mold. Thereby, the 1st cam slider 3 processed into the workpiece | work with the 1st tool 6a can be smoothly returned to the outer side of a metal mold | die by pulling out the said 1st tool 6a from a workpiece | work.

  4A to 4C, the taper portion 9b is formed on the lower surface of the cam portion where the cam surface 9a of the first cam slider 3 of the first cam mechanism is formed. A tapered portion 2e is provided on the upper surface of the cam portion on which the cam surface 2c of the first cam driver 2 as a cam driver is formed, and both the tapered portions 2e and 9b are formed to be slidable with the same taper angle. Has been.

  When both the tapered portions 2e and 9b come into sliding contact, the tapered surface 5a of the first forced return member 5 is not in contact with the side surface of the return pin 10 with a slight gap. A margin is provided to ensure that the forced return is performed. In addition, since there will be a collision of tools if there is an excessive gap, it is of course set appropriately.

Both the taper portions 2e and 9b may be horizontal surfaces because the cam surface 2c of the first cam driver 2 and the cam surface 9a of the first cam slider 3 are disengaged and separated after the cam action. From the state where the pressing action by the surface is maximized , it is provided to alleviate the shock that is suddenly released and smoothly return.

  As shown in FIGS. 1A to 3, the cam device 1 is attached and fixed to an upper mold of a mold as a second cam mechanism in addition to the first cam driver 2 and the first cam slider 3. The second cam driver 7 and the second cam driver 8 which is moved into the mold by the second cam driver 7 to process the workpiece with the second tool 6b and is slidably supported by the common cam base 4 which is a cam base. And are arranged side by side. Since the position of hole machining or the like is close to the workpiece, cam devices are arranged with high density.

  In this way, the cam device 1 is a double-acting cam device, the machining timing of the first cam slider 3 which is a cam slider in the first cam mechanism by the first tool 6a, and the second cam slider in the second cam mechanism. The machining time by the second tool 6b is set to be different. That is, after the first cam slider 3 is processed on the workpiece with the first tool 6a and returned to the original position, the second cam slider 8 starts to move by the second cam driver 7, and the workpiece is applied to the workpiece with the second tool 6b. It is designed to be processed.

The first cam slider 3 and the second cam slider 8 which are the cam sliders are arranged side by side in contact with each other on one side surface, and as shown in FIGS. An intermediate plate 11 that receives a side pressure therebetween is interposed. The shared cam base 4 is provided with guide plates 4a and 4b for guiding the first cam slider 3 and the second cam slider 8 when they slide in the processing direction.

  With the cam device 1 configured as described above, the machining operation of the cam device 1 will be described with reference to FIGS. As shown in FIGS. 5A to 5C, the upper die is in the initial state at the position of the top dead center. Next, as shown in FIG. 6, when the upper mold of the mold is lowered, the first cam slider 3 is pushed to the inner side of the mold by being pushed by the cam surface 2c of the first cam driver 2. Drilling or the like is performed with a tool (piercing punch or the like) 6a. At this time, the first forced return member 5 has not yet come into contact with the return pin 10, and the second cam driver 7 has been lowered and has not yet come into contact with the second cam slider 8.

  Next, the engagement of the cam member 2b and the cam roller 9 shown in FIGS. 4A to 4C is released, and the return pin 10 is pressed backward by the tapered surface 5a of the first forced return member 5, The tapered portions 2e and 9b are in sliding contact, and the first cam slider 3 and the first tool 6a are moved to the outside (rear) of the mold.

  Then, as shown in FIGS. 7A to 7C, the first cam driver 2 moves toward the bottom dead center, and the first cam slider 3 moves out of the mold. The state shown in FIG. 7 is the initial state of the second stage cam device. The cam surface 7a of the second cam driver 7 abuts against the cam surface of the second cam slider 8, and this cam action causes the first 2-cam slider 8 moves forward toward the workpiece.

  7 to 8, the second tool 6b of the second cam slider 8 performs machining such as drilling on the workpiece. The state shown in FIG. 8 is the bottom dead center position of the upper mold. From here, the upper mold rises toward the top dead center. Then, as shown in FIGS. 9 to 10, the second cam driver 7 is simultaneously raised and engaged with the upper wall surface of the return groove 8 a on the side wall of the second cam slider 8 by the second forced return member 12. Thus, the second cam slider 8 is forcibly moved to the outside (rear) of the mold.

The cam member 2b of the first cam driver 2 collides with the cam roller 9 in the middle of ascending, and pushes the cam roller 9 upward by rotating the cam roller 9 around the connecting pin coupling portion. As a result, the cam roller 9 escapes from the rising path of the cam member 2b and is retracted, so that the cam action is avoided and double strike is prevented.

  When the cam device 1 operating in this way, for example, forging a workpiece such as a crankshaft, for example, in order to quickly complete drilling at a plurality of locations in one process, the arrangement shown in FIG. It can be carried out. In the workpiece 16 of the lower mold 15, when there are perforated portions 17, 18 at narrow intervals, the piercing punch a, b, c, d, which is a tool in the cam devices 1 a, 1 b in the figure, , C as a pair, and then pierce punches b, d as a pair.

  As shown in FIGS. 12 (A) to 12 (D), the piercing punches a and c are formed in the cam devices 1a and 1b after the hole processing is completed in the middle of the process from the top dead center to the bottom dead center. Return to the initial position (see FIGS. 12A and 12B). Thereafter, the piercing punches b and d drill holes in the workpiece 15 in the process from the middle position of the upper die to the bottom dead center (see FIGS. 12C and 12D). By doing so, the pierce punches b and c in the pair of cam devices 1a and 1b work at different times, so that even if the axes intersect, they do not collide with each other.

  The cam apparatus according to the present invention can be applied to a workpiece having a complicated shape such that the axes of the processing tools intersect each other. The present invention is not limited to the closed forging device but can be applied to a normal drilling device and a bending device.

1 cam device,
2 1st cam driver, 2a support part,
2b cam member, 2c cam surface,
2d mounting base, 2e taper,
3 first cam slider, 3a cam slider body,
4 shared cam base, 4a guide plate,
4b guide plate, 4c stopper,
5 1st forced return member, 5a taper surface,
6a 1st tool, 6b 2nd tool,
7 Second cam driver, 7a Cam surface,
8 Second cam slider, 8a Return groove,
9 Cam roller, 9a Cam surface,
9b taper part,
10 Return pin,
11 Intermediate plate,
12 Second forced return member,
13 Energizing means such as a gas spring,
14a, 14b, 14c cushioning material,
15 Lower mold,
16 Workpiece (crankshaft etc.),
17, 18 perforated part,
19 Closed forging device.

Claims (9)

Provided between a lower mold and a mold composed of an upper mold that can be moved up and down relative to the lower mold,
A cam driver having a cam surface that is fixedly attached to the upper mold and moved into the mold;
A cam slider that has a cam surface that is in sliding contact with the cam surface of the cam driver, and is slidably supported so as to move into the mold by the vertical movement of the upper mold;
A tool that is fixedly attached to the tool mounting surface of the cam slider and that processes a part of the workpiece into a desired shape;
A return device for moving the cam slider from the processing position to the original initial state to the outside of the mold by the biasing means;
In a cam device comprising a cam base that slidably supports the cam slider and is fixed to the lower mold,
The cam surface of the cam driver and the cam surface of the cam slider are cam-operated by sliding the cam surfaces between the upper die from the top dead center to the bottom dead center. When the cam surface further descends, the cam surfaces are disengaged from each other,
When the upper mold returns from the bottom dead center to the top dead center, the cam surface of the cam driver and the cam surface of the cam slider do not collide with each other so that either one of the cam surfaces is retracted from the collision range. In order to retract the surface, the cam surface of the cam slider is provided on one end side of the cam roller which is a rod-like body connected to the cam slider body so that it can swing within a required range separately from the cam slider body. A retracting device is provided, and
The cam roller is swung up when moving from the bottom dead center to the top dead center on the cam surface of the cam driver, and then swings with its own weight to return to the original position.
A cam device characterized by the above. In the mounting base portion of the cam driver, the supporting portion extending from the mounting base portion, and the cam surface formed at the end portion of the supporting portion, the cam portion of the cam slider moves to the outside of the mold. When returning to the initial position, it must be retracted to the outside of the mold from the position of the cam surface of the cam driver to avoid a collision,
The cam apparatus according to claim 1. When both cam surfaces are disengaged, a forced return device for returning the cam slider to the outside of the mold is provided with a return pin protruding from the side surface of the cam slider and a side surface of the return pin in contact with the mold. A forcible return member that has a tapered surface for moving the cam slider to the outside and is fixed to the upper mold;
The cam device according to claim 1 or 2, wherein A tapered portion is provided on the lower surface of the cam portion on which the cam surface of the cam slider is formed, and a tapered portion is provided on the upper surface of the cam portion on which the cam surface of the cam driver is formed. Both the tapered portions have the same taper angle. It is formed so as to be slidable, and it does not contact between the taper surface of the forcible return member and the side surface of the return pin so that the forced return is surely performed when both the taper portions come into slidable contact. A slight gap is provided in the
  The cam device according to any one of claims 1 to 3, wherein A second cam driver that is attached and fixed to the upper mold and a second cam slider that is moved into the mold by the second cam driver to process the workpiece with a tool and are slidably supported by the cam base are provided side by side. A double-acting cam device, wherein the machining time of the cam slider tool is set to be different from the machining time of the second cam slider tool,
The cam device according to any one of claims 1 to 4, wherein The cam slider and the second cam slider are arranged side by side in contact with each other side surface, and an intermediate plate receiving a side pressure is interposed between the both side surfaces in contact with each other,
The cam apparatus according to claim 5 . A plurality of cam devices according to any one of claims 1 to 6 are installed in any combination between an upper mold and a lower mold, and a machining tool is used as a punch for drilling;
  Drilling device characterized by. A device that closes and forges the crankshaft.
A mold composed of a lower mold and an upper mold provided to be movable up and down with respect to the lower mold;
A plurality of cam devices according to any one of claims 1 to 6 provided in the mold,
The closed forging device in which the cam device tool forms a plurality of holes in a pin portion of the crankshaft in a single step when the crankshaft is closed forged.
A first cam mechanism that moves a tool of a cam slider of the cam device into the mold when the upper mold relatively approaches the lower mold, and molds one hole of the crankshaft;
By moving the upper die and the lower die relatively closer than the advanced state of the tool of the cam slider, the tool of the second cam slider is moved into the mold and the other hole of the crankshaft is formed. A second cam mechanism
In the first cam mechanism, the engagement of the first cam mechanism is released when the cam slider moves into the mold and the upper die and the lower die are brought closer to each other than the state where one hole is formed. When the cam slider is moved to the outside of the mold by an internal elastic body, the tool of the cam slider and the tool of the second cam slider of another cam device that intersects the tool of the cam slider are processed. Equipped with a retracting mechanism that does not interfere by slipping,
A plurality of cam devices are provided symmetrically on the crankshaft;
Closed forging device characterized by. The first cam mechanism is constituted by a cam driver having a curved surface and a cam slider having a curved surface and constituted by a link member;
The closed forging device according to claim 8 .

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