JP3033155U - Press forming machine - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To reliably prevent punch core runout while preventing a material from being pulled out together with a punch from a die during molding, and perform high-precision press forming. SOLUTION: A punch holder 19 attached to the front surface of a ram 6 that moves back and forth toward a movable die 11 arranged on a machine base 2 has a plurality of elongated holes 28a extending in the axial direction on its peripheral surface.
A cylindrical stripper 27 having 18a is slidably inserted within a certain range, and the punch 22 is inserted into the stripper 27 so as to be relatively movable in the axial direction. Each long hole 28a of stripper 27 ... 2
A plurality of protrusions 20a ... 20a protruding so as to face the inside of 8a
And the punch 22 is supported by each of the ridges 20a ... 20a.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention particularly relates to a forging machine for molding a part having a recess or a through hole.

[0002]

[Prior art]

 A die is mounted on the machine base, and a punch is attached to the front surface of the ram that moves back and forth toward the die via a punch holder to form a material, and a part having a recess or a through hole is formed. In the forging machine, the stripper prevents the formed material from being pulled out together with the punch bit when the punch is pulled out from the die, and the gripping by the chuck claws of the material transfer means does not occur. A means for preventing the material from coming out is provided.

For example, as shown in FIG. 19, the slip-out preventing means includes a cylindrical portion 44a and a cylindrical portion 44a on the outer periphery of the tip end portion of the punch 43 protruding from the punch holder 42 provided on the front surface of the ram 41. A stripper 44 consisting of a flange portion 44b provided at the rear end of the portion 44a is slidably inserted, and at the flange portion 44b of the stripper 44, the stripper 44 extends rearward integrally from its rear surface. Two push-out pins 45, 45 supported by the punch holder 42 so as to be able to move back and forth are connected, and the push-out pins 45, 45 are abutted so as to interlock with a knockout pin 46 provided on the ram side. It has a different structure. With this configuration, when the punch 43 is pulled out from the die 47, the knockout pin driving means (not shown) moves the knockout pin 46 relative to the punch 43 so that the punch 43 can be removed through the stripping pins 45. 44 is pushed out to the die 48 side, and the formed material is held down by the front end surface of the stripper 44, and the material is left in the die 48 for a predetermined time until the punch 43 is pulled out from the die 48. ing. As a result, after the punch is retracted, the material is pushed out of the die 47 due to the advance of the knockout pin 48 on the die 47 side, gripped by the chuck claws of the material transfer means, and transferred to a predetermined position by the material transfer means. It is like this.

[0004]

[Problems to be solved by the invention]

 However, in the above-mentioned slip-out preventing means, since the above-mentioned stripper 44 is arranged on the front surface of the punch holder 42, a space for disposing the stripper 44 is secured on the front surface side of the punch holder 42. There is a need. Therefore, the distance L from the punch holder 42 to the tip of the punch 43 becomes long, that is, the support of the punch 43 by the punch holder 42 is carried out from the rear end portion of the punch 43 to the tip end portion of the punch 43. There is a problem in that the range of the punch 43 is limited to the rear end position, and the runout of the punch 43 is likely to occur during molding, making it difficult to perform high-precision molding.

In view of this, the present invention is capable of reliably preventing punch runout while performing high-precision molding while preventing the material after molding from being pulled out of the die as the punch retracts. An object of the present invention is to provide a forging machine capable of performing the above.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned subject, the present invention is characterized by being configured as follows.

That is, a device according to claim 1 of the present application (hereinafter, referred to as a first device) has a die mounted on a machine base and a punch holder on the front surface of a ram moving forward and backward toward the die. In a press forming machine for forming a raw material with a punch attached to the punch holder, a cylindrical stripper having a plurality of elongated holes extending in the axial direction on the peripheral surface is slidably inserted into the punch holder within a certain range. At the same time, the punch is inserted into the stripper so as to be relatively movable in the axial direction, and a part of the punch holder is projected so as to face each of the elongated holes of the stripper, and the punch is formed by the projecting portion. The stripper is configured to support the outer periphery of the punch, and the stripper is relatively pushed from the punch holder to the die side so as to prevent the material together with the punch from coming out of the die when the punch is retracted. It is characterized in that it is provided with a pushing-out means.

Here, the projecting portion is a concept including a cylindrical shape which penetrates each elongated hole of the stripper and is continuous over the entire inner peripheral surface of the stripper and supports the outer periphery of the punch.

In addition to the structure of the first invention, the device according to claim 2 (hereinafter, referred to as the second device) has a structure in which the tip of the punch holder is located on the die side when the material is formed by advancing the ram. It is characterized in that it is configured to plunge into the mold in a fitted state.

Further, in the device according to claim 3 (hereinafter, referred to as the third device), in addition to the configuration of the first device, the stripper has a cylinder having a plurality of elongated holes whose rear end side is open on the peripheral surface. -Shaped stripper main body and the outer periphery of the rear end portion of the stripper are detachably fitted in the stripper main body in the axial direction immovably, and abut against the punch holder by abutting the punch holder. It is characterized by being constituted by a tubular engaging member that is divided into two parts that regulates the sliding range in the axial direction.

With such a configuration, the following actions are obtained, respectively.

First, according to the first to third inventions, when the punch is retracted, the stripper is relatively pushed out from the punch holder to the die side to press the material to the die side. Can be prevented from being pulled out from the die side die, and moreover, the punch holder has a cylindrical stripper with a plurality of elongated holes extending in the axial direction on the peripheral surface that slides within a certain range. The punch is inserted into the stripper so as to be movable relative to the axial direction, and a part of the punch holder is projected so as to face each of the long holes of the stripper. Since the protruding portion is configured to support the outer periphery of the punch, it is possible to reliably support the vicinity of the tip end of the punch by the punch holder without being affected by the stripper. . As a result, the amount of protrusion of the punch from the punch holder can be suppressed while the cylindrical stripper is provided, and it is possible to effectively prevent runout of the punch during molding.

According to the second aspect of the invention, when the ram is advanced and the material is formed, the tip of the punch holder is configured to rush into the die-side mold in a fitted state. Since the tip of the punch holder is restrained by the die side die, the runout of the punch holder itself is prevented, which makes it possible to prevent the runout of the punch holder as well as the runout of the punch holder. The core runout of the punch will be prevented more reliably.

Further, according to the third aspect, the stripper is immovably fitted to the outer periphery of the rear end portion of the stripper and the tubular stripper body having a plurality of elongated holes whose rear end side is open on the peripheral surface. When the stripper is installed in the punch holder, the stripper and the stripper body are divided into two parts, because the stripper body and the punch holder collide with the punch holder and regulate the sliding range of the stripper body with respect to the punch holder. Of the stripper body from the rear end side of the punch holder, and the outer periphery of the stripper body from the rear end side of the punch holder. It can be easily incorporated by fitting into. Further, the structure for restricting the sliding range of the stripper main body with respect to the punch holder can be simplified because the tubular engaging member only has to abut against the punch holder.

[0015]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a forging machine 1 according to this embodiment is a multi-stage forging machine for molding a ring-shaped part (part) with a plurality of stations X1 to X3. A cutter device 4 and a plurality of die mold units 5 ... 5 are installed side by side on a die block 3 fixed to the die block 2, and the die block 3 moves forward and backward so as to approach and separate from the die block 3. A plurality of punch side die units 7 ... 7 are attached to the ram 6 so as to face the die side die units 5 ... 5, respectively.

Then, the wire device A supplied from the outside is cut by the cutter device 4 to form a cylindrical material B having a predetermined size as shown in FIG. 2, and the material B is attached to each of the die sides. By sequentially supplying the pre-processing station X1, the closing forging station 2 and the punching station X3, which are composed of the die units 5 ... The intermediate material C having a bulged outer peripheral surface as shown in FIG. 3 and the intermediate product D having concave portions at both end surfaces as shown in FIG. 4 are processed into a ring-shaped part E as a final product as shown in FIG. It is designed to be molded.

Next, a description will be given of a configuration in which the die side die unit 5 and the punch side die unit 7 which are the subject of the present invention are applied to the punching station X3.

The die side die unit 5 is provided on the punch side front surface of the die block 3 fixed at a predetermined position of the main body frame 2 as shown in FIG. 6, and is fixed to a predetermined position of the die block 3. A cylindrical movable die 11 is slidably mounted in the formed die case 12 via a die guide 13, and a central guide member 14 is slidably inserted into the movable die 11. The movable die 11 is supported by the die block 3 so as to receive a load from the front side (punch side, the same applies below), and when it moves forward by a predetermined amount, it abuts against the rear end surface of the die guide 13 and advances. The central guide member 14 has a tubular shape, and a flange 14a is provided at the rear end thereof, and the rear end surface of the flange 14a is supported by the receiving member 15, and the rear end surface of the receiving member 15 is Is in contact with a knockout pin 16 that is moved forward and backward by the knockout pin drive means, and the center guide member 14 is advanced to the punch side via the receiving member 15 by the advance of the knockout pin 16. It has become. Further, the flange 14a of the central guide member 14 is slidably inserted into the rear-side large-diameter inner hole 11a of the movable die 11, and when it is moved forward by a predetermined amount, the large-diameter inner portion of the movable die 11 is moved. The forward movement is stopped by colliding with the stepped portion 11b of the hole 11a. Since the knockout pin driving means for the knockout pin 16 has a known structure, its details are omitted.

The scraps c after molding are discharged to the outside from the through hole 14b of the central guide member 14 through the discharge port 15a of the receiving member 15 and the inclined discharge passage 17 formed in the die block 3. Further, the ring-shaped component E after molding is pushed forward of the die case 12 by the central guide member 14 as the receiving member 15 advances toward the punch side, and the ring-shaped component E of the material transfer means is moved. It is sandwiched by the chuck claws 18 and transferred to a predetermined position.

The punch side die unit 7 is fixed to the ram 6 so as to face the die side die unit 5 as shown in FIG. 6, and a cylindrical punch holder 19 is appropriately attached to the ram 6. It is fixed by a fixing means (not shown) such as a fixing bolt. The punch holder 19 is composed of a cylindrical punch holder main body 20 and a flanged cylindrical support member 21 that is inserted and fixed in the main body 20 from the rear side. The punch holder main body 20 and the support member are provided. A cylindrical punch 22 is inserted and supported at the center position of the punch 21, and the tip of the punch 22 projects into the movable die 11 as the ram 6 advances to the die side. . Although not shown, the punch 22 is fixed to the punch holder body 20 such that it cannot be pulled out, for example, by engagement with the punch holder body 20 via a step.

The support member 21 is fixed to the punch holder body 20 with bolts 23, and the support member 21 is provided with a pushing means for pushing out a stripper 27 described later. The push-out means is inserted into a through hole 24 formed in the support member 21, and the tip of the push-out means abuts against the push-out pins 25, 25 whose front end faces the stripper 27 and the rear end surface of the push-out pins 25, 25, and a knockout (not shown) is shown. It is composed of knockout pins 26, 26 which are moved forward and backward by the pin driving means. Since the knockout pin driving means has a known structure, its details are omitted.

On the other hand, when the support member 21 is inserted into the punch holder body 20, the stripper support hole 20a is left on the tip end side of the punch holder body 20, and the ring formed by the support hole 20a is formed. A cylindrical stripper 27 for pressing the shaped component E against the movable die 11 side is inserted, and a plurality of elongated holes 28a ... 28a extending in the axial direction are formed on the peripheral surface of the stripper 27, 20b are extended inward from the inner surface of the support hole 20a on the tip end side of the punch holder body 20 so as to project inwardly so that the projections 20b ... 20b are elongated holes 28a of the stripper 27. 28a, and by pressing the punch 22 into the protrusions 20b ... 20b of the punch holder body 20 in this state as described above, the protrusions 20b. The punch 22 is configured to be gripped and supported on the outer periphery thereof. As a result, the vicinity of the tip end side of the punch 22 can be reliably supported by the punch holder body 20 without being affected by the stripper 27, and the protrusion amount L of the punch 22 from the punch holder body 20 can be kept small. This makes it possible to effectively prevent runout of the punch during molding.

As shown in detail in FIGS. 7 to 10, the stripper 27 partially leaves the front end side as a complete cylindrical portion 28b, and the axial direction in the axial direction on the peripheral surface from the end to the rear end of the cylindrical portion 28b. 28a and a cylindrical stripper body 28 having a plurality of elongated holes 28a ... 28a that are open at the rear end side, and a split cylindrical engagement fitted to the outer periphery of the rear end portion of the stripper body 28. And the member 29. A groove 28c extending in the circumferential direction is formed at the rear end of the stripper main body 28, and a plurality of protrusions 29a ... 29a that enter the elongated holes 28a ... 28a in the tubular engaging member 29 are fitted in the circumferential groove 28c. Since the annular protrusion 29b is formed, the stripper main body 28 and the tubular engagement member 29 are fixed by fitting the split tubular engagement member 29 into the stripper main body 28.

Further, as shown in FIG. 11, the punch holder main body 20 has a tip end portion formed into a cylindrical shape which can be fitted and inserted into the die guide 13 so that the ram 6 can be advanced. Along with this, when the punch 22 plunges into the movable die 11, the tip of the punch holder body 20 also plunges into the die guide 13.

Next, in the case of molding from the intermediate product D having concave portions on both end faces as shown in FIG. 4 to the ring-shaped part E as a final product as shown in FIG. The action of will be described.

First, as shown in FIG. 6, the intermediate product D is set in front of the central guide member 14 of the die side die unit 5 by the chuck claws 18 of the material transfer means. At this time, the ram 6, that is, the punch-side mold unit 7 is located away from the die-side mold unit 5.

When the ram 6 advances to the die side from this state as shown in FIG. 11, the intermediate product D is pressed by the punch 22 and the intermediate product D is pushed into the movable die 11. Along with this, the central guide member 14 is also pushed in and received by the receiving member 15, and as a result, the central portion of the intermediate product D is punched out and the ring-shaped part E is formed.

From this state, when the ram 6 is retracted as shown in FIG. 12, the knockout pin 26 is advanced to the die side by the knockout pin driving means (not shown), which causes the stripper 27 via the extrusion pin 25. Is relatively pushed out from the punch holder main body 20 toward the die side, and the ring-shaped part E is pressed into the punch-side mold unit 7 by the tubular portion 28b of the stripper main body 28 of the stripper 27, so that the ring-shaped part during molding The biting action of the part E on the punch 22 is eliminated, and it is prevented that the ring-shaped part E is pulled out from the die side die 5 as the punch 22 moves backward.

When the ram 6 is further retracted from the above state as shown in FIG. 13, the movement of the punch side knockout pin 26 to the front side by the knockout pin driving means is released, and the punch holder body 20 moves. The rear end portions of the protrusions 20b ... 20b collide with the tubular engaging member 29 of the stripper 27, and the stripper body 28 is pulled out from the die side die unit 5.

On the other hand, in association with the movement of the ram 6 described above, the die side knockout pin 16 is advanced to the punch 22 side by the knockout pin driving means (not shown), and the receiving member 15 is pushed out to the punch side. , The central guide member 14, the movable die 11, and the ring-shaped component E are extruded to the punch side in an integrated state, and the movable die 11 hits the die guide 13 during extrusion, and further extrusion is prevented. After that, the central guide member 14 works to push the ring-shaped component E out of the movable die 11. In this way, since the ring-shaped component E is pushed out from the movable die 11 after the movable die 11 has advanced to the die guide 13, the wear of the movable die 11 due to the ring-shaped component E is reduced. Will be done. Further, the ring-shaped component E extruded onto the die-side mold 5 is clamped by the chuck claws 18 of the material transfer means and transferred to a predetermined position, and the scrap c is further transferred between the steps shown in FIGS. It is discharged from the discharge port 15a of the receiving member 15 to the outside through the discharge passage 17 of the die block 3.

According to the present application, the cylindrical stripper 27 having the plurality of elongated holes 28a ... 28a extending in the axial direction on the peripheral surface is slid in the supporting hole 20a of the punch holder body 20 within a certain range. The punch 22 is movably inserted into the stripper 27, and the punch 22 is inserted into the stripper 27 so as to be relatively movable in the axial direction, and the punch holder is inserted into the long holes 28a ... 28a of the stripper 27. 20b of the main body 20 are projected so as to face them, and these ridges 20b ... 20b are configured to grip and support the outer periphery of the punch 22, so that the tip end from the rear end of the punch 22. It is possible to surely support the punch holder 19 up to near the portion, that is, the punch holder main body 20 and the support member 21, and thereby the punch 22 protrudes from the punch holder 19. The amount of protrusion can be suppressed to be small, the core runout of the punch 22 at the time of molding can be reliably prevented, and highly accurate molding can be performed.

When the punch 22 pushes the intermediate product D into the movable die 11 side for molding, the tip of the punch holder body 20 abuts the movable die 11 and pushes the movable die 11 into the die case 12. The tip end portion of the punch holder body 20 projects into the die guide 13 in a fitted state. As a result, the leading end of the punch holder body 20 is restrained by the die case 12, and the center runout of the punch holder body 20 itself is also prevented, so that the punch runout is performed more reliably.

In the above embodiment, the structure in the case of being applied to the punching station X3 for forming the ring-shaped part E as the final product from the intermediate product D having the recessed portions on both end surfaces has been described. It is needless to say that the same can be applied to the hermetically forging station X2 for molding a part having a predetermined shape having a recess or an intermediate product.

Next, FIGS. 14 to 18 show another embodiment in which the tip of the punch holder is directly inserted into the die mold when the ram is advanced to form the material. The structure of the movable die 11 slidably supported by the die case 12 in the multi-stage pressure forming machine described in the previous embodiment uses a fixed die 31 and the die 31 is used. The punch holder 32 that can be directly fitted into the die hole 31a is used.

Specifically, as shown in FIG. 14, the fixed die 31 is immovably fixedly supported in the die case 12 arranged on the front surface of the die block 3, while the punch holder main body 33 and A punch holder sleeve 36, which includes a support member 34, is provided with a punch holder sleeve 36 that supports the tip portion of the punch 35 and that can be directly fitted into the die hole 31a of the die 31 at the tip portion of the punch holder body 33. ing.

As shown in FIG. 15 and FIG. 16, the punch holder sleeve 35 is cylindrical and has a plurality of ridges 36a ... 36a extending in the axial direction on the outer periphery thereof and having an arcuate outer surface. 36a, engaging portions 36b ... 36b protruding outward in the radial direction are formed at one end of each of the ridges 36a. The sleeve 36 is inserted and supported in the tip hole portion 33a of the punch holder-body 33 through the outer peripheral surface of each of the ridges 36a ... 36a, and the punch 35 is attached to the inner surface of the punch holder sleeve 36c. Is inserted and supported. A spacer 37 is interposed between the punch holder sleeve 36 and the support member 34 on the outer periphery of the punch 35, and the punch holder sleeve 36 is attached so as not to move. 36a of the punch holder sleeve 36 and the outer periphery of the spacer 37, the stripper 27 substantially similar to that used in the previous embodiment is used. In the same manner as in the case of (1), it is slidably fitted in a certain range. In that case, the outer diameter of the stripper 27 is substantially the same as the diameter of the outer peripheral surface of the ridge portion 34a, and is preferably slightly smaller. The configuration other than the punch holder 32 and the die 31 is substantially the same as the configuration of the previous embodiment as illustrated with the same reference numerals, and the description thereof will be omitted.

Even in the case of such a configuration, as shown in FIG. 17, the protrusions 36 a of the punch holder sleeve 36, which is inserted and supported at the tip of the punch holder body 33 and supports the punch 35. A cylindrical stripper 27 having a plurality of elongated holes 28a ... 28a extending in the axial direction on the circumferential surface is slidably fitted within a certain range in the groove portion between the rear end of the punch 35. The punch holder 19, that is, the punch holder main body 33, the support member 34, and the punch holder sleeve 36, can support from the portion to the tip end portion, that is, the amount of protrusion of the punch 35 from the punch holder sleeve 36 can be kept small. As a result, it is possible to reliably prevent the runout of the punch 22 during molding, and it is possible to perform highly accurate molding.

Further, when the punch 22 pushes the intermediate product D toward the fixed die 31 to punch out the center portion of the intermediate product D to form the ring-shaped component E, as shown in FIGS. The punch holder sleeve 36 provided at the tip of the holder main body 33 directly projects into the die hole 31a of the fixed die 31 in a fitted state, whereby the punch holder sleeve 36 is restrained by the fixed die 31. As a result, the center runout of the punch holder body 20 itself is prevented, and the center runout of the punch is performed more reliably. Particularly, since the punch holder sleeve 36 is directly inserted into the die hole 31a of the fixed die 31 in a fixed state after the die has a fixed structure, when a movable die which is apt to cause sliding play is used. Compared with this, it becomes possible to perform molding more accurately.

Further, in the above embodiment, in consideration of durability and economy at the time of replacement, the punch holder main body 33 is provided with the punch holder sleeve 36 which is a member excellent in durability different from the main body 33. Although they are attached, it goes without saying that the punch holder body 33 and the punch holder sleeve 36 may be integrally formed. In that case, if the tip of the punch holder body is formed so as to be capable of directly inserting into the die hole 31a of the fixed die 31 and the inner surface of the tip is provided with an insertion groove through which the stripper 28 can be inserted. Good.

[0041]

[Effect of the invention]

 As described above, according to the first to third inventions of the present application, when the punch is retracted, the stripper is relatively pushed out from the punch holder toward the die side to press the material toward the die side. It is possible to prevent the material from being withdrawn from the die side die together with the punch, and moreover, the punch holder has a cylindrical stripper having a plurality of elongated holes extending in the axial direction on the peripheral surface within a certain range. The punch is slidably inserted, and the punch is inserted into the stripper so as to be relatively movable in the axial direction, and a part of the punch holder faces the elongated holes of the stripper. The punch holder is configured so as to support the outer periphery of the punch, so that the punch holder is securely supported near the tip side of the punch without being affected by the stripper. Theft is possible. As a result, the amount of protrusion of the punch from the punch holder can be suppressed to a small amount, and it is possible to effectively prevent the runout of the punch at the time of molding, and it is possible to perform highly accurate molding.

According to the second aspect of the invention, when the ram is advanced to form the material, the tip of the punch holder is configured to fit into the die-side mold in a fitted state. Since the tip of the punch holder is restrained by the die side die, the runout of the punch holder itself is prevented, which makes it possible to prevent the runout of the punch holder as well as the runout of the punch holder. The core runout of the punch will be prevented more reliably.

Furthermore, according to the third aspect, the stripper is immovably fitted to the outer periphery of the rear end of the stripper and the tubular stripper main body having a plurality of elongated holes whose rear end is open on the peripheral surface. When the stripper is installed in the punch holder, the stripper and the stripper body are divided into two parts, because the stripper body and the punch holder collide with the punch holder and regulate the sliding range of the stripper body with respect to the punch holder. Of the stripper body from the rear end side of the punch holder, and the outer periphery of the stripper body from the rear end side of the punch holder. It can be easily installed by fitting it to the above-mentioned cylindrical engaging part. The structure can be simplified because it is only necessary to bring the material into contact with the punch holder.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a press forming machine according to the present invention.

FIG. 2 is a process diagram showing a molding process of a product molded by the forging machine according to the present invention.

FIG. 3 is an explanatory diagram of an intermediate material formed in a pre-processing station.

FIG. 4 is an explanatory diagram of a ring-shaped part formed by a closed forging station.

FIG. 5 is an explanatory view of a ring-shaped part formed at a punching station.

FIG. 6 is a cross-sectional view of the main part before the start of advancement of the ram.

FIG. 7 is a front view of the stripper with the stripper body and the tubular engagement member disassembled.

FIG. 8 is a plan view showing a state in which the stripper main body and the tubular engaging member of the stripper are assembled.

9 is a sectional view taken along the line AA in FIG. 7 in which the stripper main body and the tubular engaging member are assembled.

10 is a cross-sectional view taken along the line EE in FIG.

FIG. 11 is a transverse cross-sectional view of the main part when the ram advances.

FIG. 12 is a transverse cross-sectional view of a main part during the start of retreat of the punch.

FIG. 13 is a transverse cross-sectional view of a main part after the punch is retracted.

FIG. 14 is a transverse cross-sectional view of a main part when a ram is advanced, showing another embodiment.

FIG. 15 is a front view of a punch holder sleeve.

FIG. 16 is a bottom view of the punch holder sleeve.

FIG. 17 is a cross-sectional view of the main parts in FIG.

18 is a cross-sectional view taken along the line AA of FIG.

FIG. 19 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 1 Press Forming Machine 11 Movable Die 19 Punch Holder 20b Ridge 22 Punch 25, 25 Extrusion Pin 26, 26 Knockout Pin 28 Stripper 28 Stripper Main Body 28a ... 28a Long Hole 29 Cylindrical Engaging Member 31 Fixed Die 32 Punch Holder 33 Punch 36 Punch holder sleeve 36a ridge

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroaki Taniguchi, Hiroshi Taniguchi, Kumiyama-cho, Kuse-gun, Kyoto Prefecture Shimotsuya, small letter No. 46, Fortune's Castle, Sakamura Machinery Co., Ltd. Kyoto office

Claims (3)

[Utility model registration claims] 1. A press forming machine for forming a raw material by a die arranged on a machine base and a punch mounted on a front surface of a ram moving forward and backward toward the die via a punch holder, the press forming machine comprising: A cylindrical stripper having a plurality of elongated holes extending in the axial direction on its peripheral surface is slidably fitted in a predetermined range in a punch holder, and the punch is arranged in the stripper relative to the axial direction. Is movably inserted, and a part of the punch holder is projected so as to face each of the elongated holes of the stripper and is configured to support the outer periphery of the punch by the projecting portion, and A press forming machine, characterized in that extrusion means for relatively pushing the stripper from the punch holder to the die side is provided so as to prevent the material together with the punch from coming out of the die when the punch is retracted. 2. The method according to claim 1, wherein when the ram is advanced to form a raw material, the tip end of the punch holder is configured to be inserted into the die-side die in a fitted state. Forging machine. 3. The stripper has a cylindrical stripper body having a plurality of elongated holes whose rear end side is open on the peripheral surface, and a stripper's rear end outer periphery, which moves in the axial direction with respect to the stripper body. It is immovable and detachably fitted, and is composed of a split tubular engaging member that abuts the punch holder and restricts the sliding range of the stripper body in the axial direction with respect to the punch holder. The press forming machine according to claim 1.