JP2020104170A - Holding and scale removing device for cutting material in hot former - Google Patents

Abstract

To reliably perform upsetting for scale removal of a cutting material at a front position of a scale removal die between a bar material cutting position and a first forging station.SOLUTION: A holding and scale removing device comprises at a scale removal station between a bar material cutting position and a first stage forging station on a machine base: a solid scale removal die; a support member located at a front position of the scale removal die on the machine base; a slide body which has a holding shaft body supported by the support member, and a scale removal punch; a moving mechanism which moves the holding shaft body and the scale removal die to a cutting material holding position side, and after a ram retreats and the material, from which scale is removed, is gripped by an open/close chuck mechanism and transferred, retreats the slide body to a rear standby position; and a contact member contacts the slide body during forward movement of the ram to forcibly move the slide body forward, thereby performing upsetting.SELECTED DRAWING: Figure 1

Description

The present invention relates to a hot former for forming a long bar material heated to a predetermined temperature intermittently for a predetermined length on a forging station side, cutting it with a cutting knife, and forming the cut material into a molded product of a predetermined shape. And a scale removing device for holding a cutting material.

Conventionally, hot formers that mold various parts such as bolts, nuts, and bearings cut a heated bar material into a material of a predetermined length, and each of these cutting materials consists of a die and a punch. It is configured to be transferred to the forging stations in stages and forged into a product having a predetermined shape by forming processing by these forging stations.
In that case, for example, as shown in FIG. 10, the cutting material X1 cut into a predetermined length with a cutting knife is appropriately grasped by a transfer chuck between the cutting position of the material and the first forging station, and first, the upsetting is performed. Is transferred to the front surface of the first-stage forging station Z1 including a first die D1 having a molding hole for molding and a first punch P1, and the molding hole of the first die D1 is formed by the first punch P1 by the forward movement of the ram 4. Are upset and molded so that the material diameter has a predetermined size. Next, the formed material X2 is preformed in the second stage forging station Z2 including the second die D2 and the first punch P2, and then the preformed material X3 is formed in the third die D3 and the third die D3. Main forming is performed in the third-stage forging station Z3 including the three punches P3, and the main-forming material X4 is punched and formed into the product X in the fourth-stage forging station Z4.

No. 2521909 bulletin

By the way, like the above-mentioned conventional hot former, the cutting material X1 cut into a predetermined length by a cutting knife is directly transferred to the front surface of the first-stage forging station Z1 in its shape, and is transferred to the central portion. When the cutting die X1 is upset by the first die D1 having a forming hole and the first punch P1, the cutting material X1 is set up in the forming hole of the first die D1. The scale formed on the first die D1 may enter the forming hole of the first die D1, and there is a problem that the scale cannot be appropriately removed from the cutting material X1 during upsetting. As a result, the scale to be removed adheres to the material X2, enters the material X2 and deteriorates the quality of the product, or causes a problem such as wear of the molding holes of the first die D1 and other dies. Had.

Therefore, in the present invention, the cutting material holding means and the scale removing means are devised and combined between the cutting position of the bar material and the first forging station so that the cutting material is securely held. In addition, while maintaining the holding state continuously, the cutting material held at the front position of the scale removing die can be installed by the scale removing punch to remove the scale by using the forward movement of the ram, and An object of the present invention is to provide a cutting material holding and scale removing device in a hot former capable of maintaining the material holding by the cutting material holding means until the transfer chuck starts to transfer the scale removal material by moving the ram and the scale removing punch. ..

In order to solve the above-mentioned problems, the invention according to claim 1 of the present application is such that a machine board is pressed with a cutting knife for cutting a heated bar material into a material of a predetermined length, and a cutting material with a die and a punch. A cutting material holding and scale removing device in a hot former having a plurality of forging stations and a ram for advancing and retracting each punch in these forging stations to and from the die. A solid scale removing die provided in a scale removing station between the position and the first-stage forging station, a support member arranged in front of the scale removing die on the machine base, and a ram on the support member. A slidable member that is slidably supported in the advancing and retracting direction and has a leading end portion and a trailing end portion that project outward from the support member and that has a scale removing punch at the leading end; A holding shaft body provided so as to be able to move forward and backward from the front surface of the punch, a first urging means for constantly pushing the tip end portion of the holding shaft body forward of the scale removing punch, and a supporting member for the sliding body at all times. Of the cutting material is moved to the holding position of the cutting material by the holding shaft body and the scale removing die at the timing when the cutting material is transferred to the front side of the scale removing die and is moved to the front surface of the scale removing die. , A moving mechanism for retracting the sliding body from the holding position of the cutting material to the rear standby position of the support member at a timing after the ram retreats and the scaled-down material is gripped by the transfer chuck, and the cutting material of the sliding body. The second urging means for allowing the sliding member to move forward from the holding position and exerting a returning force of the cutting material to the holding position when moving forward, and the ram forward movement provided on one side of the ram. On the way, the sliding body which is in contact with the rear end of the sliding body and is located at the holding position of the cutting material is forcibly moved forward against the second biasing means, and the scale removing punch and the holding shaft body are integrated. In this state, the cutting material is provided with an abutting member for upsetting the scale for scale removal.

In the invention according to claim 2 of the present application, as the above-mentioned moving mechanism, a long hole extending in the advancing/retreating direction of the ram and opening above the sliding groove is formed in the lower middle portion in the longitudinal direction of the supporting member, and the sliding body is formed. On the lower part in the middle of the longitudinal direction of the ram, a recess is formed which is in communication with the elongated hole, and at the lower part of this supporting member, a rocking rod which is movably supported on the machine base in the front-rear direction of the ram and An L-shaped push lever supported so as to be swingable in the front-rear direction is provided at the tip of the swing rod, and one end of the push lever is inserted into the recess of the sliding body through the elongated hole of the support member and the other end. A return spring for urging the lever so as to normally abut the rear stopper provided on the swing rod is interposed between the portion and the swing rod, and the swing rod is provided on the die side of the ram. It is characterized in that it is interlockingly connected via a cam drive mechanism to an interlocking shaft of a power transmission system that drives the former so as to swing back and forth in synchronization with the forward and backward movement.

Further, the invention according to claim 3 of the present application is, as the above-mentioned transfer chuck, a swing claw that largely opens horizontally on the cutting position side and a V-shaped groove receiving claw on the side opposite to the cutting position. It is characterized by being provided with the opening/closing chuck mechanism.

According to the cutting material holding and scale removing device in the hot former according to claim 1 of the present application, the cutting material holding means and the scale are provided between the cutting position of the bar material and the first forging station as described above. Since the removing means is devised and integrated and arranged, the cutting material can be reliably held by the holding shaft by the forward movement of the sliding body by the moving mechanism, and the holding state is continuously maintained. While using the forward movement of the ram, the sliding body is moved forward, and with this forward movement, the cutting material held in front of the scale removing die is upset for scale removal by the cooperation of the scale removing punch and the holding shaft. Can be done. As a result, it is possible to prevent the scale formed on the surface of the cutting material from remaining in the scale removing die or entering into the forming holes of the die in the multi-stage forging station, which deteriorates the quality of the product, It is possible to prevent other adverse effects such as abrasion of the molding holes of the die. Moreover, when the ram is moved backward by the combination of the moving mechanism of the sliding body and the first and second urging means, the holding shaft body holds the scaled-down material by the urging force of the first urging means. While continuing, the scale removing punch together with the sliding member can be retracted to the holding position of the cutting material separated from the scaled material by the urging force of the second urging means. This allows the slide chuck to retract and the scale-removed material to be accurately and accurately transferred by the transfer chuck under the condition that the scale-removed material is held by being sandwiched between the holding shaft body and the scale removing die. It will be securely grasped and transferred to the first stage forging station. In addition, the slide body can be retracted and returned from the holding position of the cutting material to the rear standby position of the support member at a timing after the material scaled off by the transfer chuck is grasped. As a result, the cutting material holding operation and the scale removing operation at the timing synchronized with the movement mechanism and the advance/retreat of the ram can be favorably performed repeatedly.

According to the moving mechanism of the second aspect of the present application, the moving mechanism including the combination of the swing rod and the L-shaped push lever is compactly arranged under the support member and the sliding body. However, it is preferable that the swinging of the swinging rod can be performed accurately in synchronization with the forward/backward movement of the ram toward the die side by the cam drive mechanism provided on the interlocking shaft of the power transmission system that drives the former. ..

In addition, as the transfer chuck according to the third aspect of the present application, the transfer chuck has a swinging pawl that opens largely horizontally in the cutting position side and a V-groove-shaped recess receiving pawl on the side opposite to the cutting position. If an open/close chuck mechanism is provided, a swinging claw that opens largely horizontally to the cutting position and a V-shaped groove on the opposite side while the scale-removed material having a drum shape with a middle bulge is retracted while the ram is retracting. It is preferable that the opening and closing chuck mechanism having the recess receiving claw can smoothly enter the holding position from the lateral direction, grasp the grip reliably and accurately, and transfer it from the scale removing station to the first step.

It is a schematic plan view of the hot former according to the present invention. It is an explanatory view showing an example of a forming process from a cutting material to a product to be forged. It is a whole explanatory view of a transfer chuck part. FIG. 4 is a cross-sectional plan view of the scale removing/holding device for holding the cut material during the transfer of the cut material to the scale removing station. FIG. 3 is a cross-sectional plan view showing a state where the cutting material is held by the device. It is a cross-sectional top view which shows the upsetting state to the cutting material by the same device. It is a cross-sectional plan view showing retreat of the sliding body of the device by the 2nd urging member. It is a cross-sectional plan view showing the retreat by the moving mechanism of the sliding body of the device. FIG. 3 is a partially cutaway front view of a moving mechanism in the same device. It is a conventional explanatory view.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a hot former according to the present invention. This former 1 is provided with a die block 3 having a plurality of first die D1 to fourth die D4 arranged in parallel in a lateral direction on a machine base 2 at a constant interval, and the ram 4 is opposed to the die block 3. , 5 are provided on the machine base, and the same number of first punches P1 to P4 as the first die D1 to the fourth die D4 are attached to the front surfaces of the rams 4 and 5 in a distributed manner. In this case, the rear ends of the rams 4 and 5 are connected to the crank arm of the crankshaft 6 via rods 7 and 8, respectively, and the rotational force of the former drive motor (not shown) transmits power to the pulleys and belts. By being transmitted to the crankshaft 6 via a mechanism (not shown), the rams 4 and 5 are moved back and forth once for each rotation of the crankshaft 6, and the first punch P1 to the fourth punch P4 are moved forward and backward. Moves forward and backward with respect to the first die D1 to the fourth die D4, and has four stages of forging stations Z1 (preforming), Z2 (forming), Z3 (separation), Z4 (punching). 2, the material X1, the material X2, the material X3 and X3′ (bearing parts), the material X4 (bearing parts) and X4′ (draft residue) are sequentially formed as shown in FIG. ing.

Then, on one side of the die block 3, a supply device 9 for supplying the heated bar material to the supply part 3a of the die block 3 and a bar material supplied on the front surface of the die block 3 for a predetermined length are formed. A cutting knife 10 for cutting to X0 and a scale removing station Z0 interposed between the bar material cutting position and the first-stage forging station Z1 are provided.

A horizontal guide member (not shown) is provided on the upper part of the machine base 2, and a movable frame 11 as shown in FIG. 3 is provided on the horizontal guide member in the direction in which the first die D1 to the fourth die D4 are arranged in parallel. In addition to being movably supported, a drive rod 12 is connected to the right end of the movable frame 11 in the drawing, and the drive rod 12 is moved to the left and right in synchronization with the forward and backward movement of the rams 4 and 5 toward the die side. The movable frame 11 is configured to reciprocate left and right by being driven back and forth in the direction.

As shown in FIG. 2, four chuck mechanisms 13, 14, 15, 16 are attached to the front surface of the movable frame 11, and the movable frame 11 is reciprocated in the left-right direction to open and close at the leftmost side, that is, the upper stage side. The chuck mechanism 13 is located between the scale removing station Z0 and the first forming station Z1, and the parallel chuck mechanism 14 is located next between the scale forming station Z0 and the second forming station Z2. The chuck mechanism 15 is reciprocated between the second molding station Z2 and the third molding station Z3, and the parallel chuck mechanism 16 located on the rightmost side is reciprocated between the third molding station Z3 and the fourth molding station Z4. .. In this way, a transfer chuck for sequentially transferring the material received on the upper stage side to the die in the lower stage molding station by these four chuck mechanisms 13, 14, 15, 16 is configured.

In that case, the parallel chuck mechanisms 14, 15 and 16 grasp and transfer the materials projected from the first die D1 to the third die 3 by knockout pins (not shown), respectively, while the open/close chuck mechanism 13 , A pair of chuck claws 13a and 13b are mechanically opened/closed in synchronization with the advance/retreat of the ram 4, so that the scale removing material X0 at the scale removing station Z0 described later is grasped and transferred to the first station Z1. There is.

In the embodiment shown in FIG. 1, the first punch D1 of the forging station Z1 of the first stage is attached to the first ram 4 and is composed of two rams. The forging stations Z2 to Z4 of the second to fourth stages are installed. The second to fourth punches D2 to D4 are attached to the second ram 5, and two crank arm portions (not shown) having different crank angles are formed in the crank arm of the crank shaft 6, and one crank arm portion is formed. When the crankshaft 6 is rotated by connecting the first ram 4 via the rod 7 to the other ram 4, connecting the other ram to the other crank arm via the rod 8, and rotating the crankshaft 6, The forging forming start timing in the second to fourth forging stations Z2 to Z4 is set to be slightly earlier than the starting timing in the first forging station Z1. As a result, the timing of the load acting on the machine frame at the time of forging is shifted to reduce the total maximum load and to reduce the deviation of the position where the load is applied, suppressing the deformation of the machine frame and the occurrence of prying rams. It has less effect on. In addition, even if a blanking station is formed during the terminal processing, the load variation during the blanking is suppressed to be small to prevent defective products.

According to the present invention, in the hot former 1 configured as described above, the scale removing station Z0 provided between the bar material cutting position on the machine stand 2 and the first-stage forging station Z1 holds the cutting material and also scales. The removal device 20 is provided.

As shown in FIGS. 4 to 9, the cutting material holding and upsetting device 20 is provided in the scale removing station Z0 between the bar material cutting position on the machine base 2 and the first-stage forging station Z1. A solid scale removing die 21, a support member 22 disposed in front of the scale removing die 21 on the machine base 2, a support member 22 slidably supported in the advancing and retracting direction of the ram 4, and a tip end thereof. And a rear end portion of the sliding member 24 projecting outward from the support member 22 and having a scale removing punch 23 at the front end, and a front end portion of the slide member 24 which is installed in the scale removing punch 23 and extends forward from the front face of the punch 23. The holding shaft 25 that can be retracted, the air cylinder mechanism (first urging means) 26 that always pushes the tip of the holding shaft 25 forward of the scale removing punch 23, and the sliding body 24 are When the cutting material X is positioned at the rear standby position of the support member 22 (the standby position in FIG. 4) and the cutting material X is transferred to the front surface of the scale removing die 21, the slide body 24 is advanced with respect to the support member 22 and the rear standby position ( While moving from the standby position of FIG. 4) to the holding position of the cutting material X by the holding shaft 25 and the scale removing die 21 (holding position of FIG. 5), the ram 4 is retracted and the scaled material X0 is opened and closed as described above. At the timing of being gripped by the chuck mechanism 13 and transferred to the first-stage forging station Z1, the sliding body 24 is moved from the holding position of the cutting material X (holding position of FIG. 7) to the rear standby position of the support member 22 (FIG. 8). Moving mechanism 27 for retracting to the standby position) and the sliding body 24 to allow the sliding body 24 to move forward from the holding position of the cutting material (holding position of FIG. 5) and move forward (moving position of FIG. 6). A return spring (second urging means) 28 for exerting a returning force on the cutting material to the holding position (the holding position in FIG. 5) is provided on one side portion of the sliding body of the first ram 4. During the forward movement of the ram 4, the sliding body 24 which is in contact with the rear end portion of the sliding body 24 and is located at the holding position (the holding position in FIG. 5) of the cutting material is moved forward against the return spring 28. The scale removing punch 23 and the holding shaft 25 are integrally provided with an abutting member 32 for upsetting the cutting material for scaling.

As shown in FIG. 4, the holding shaft 25 includes a large-diameter shaft portion 25a and a small-diameter shaft portion 25b. The large-diameter shaft portion 25a is housed inside the hollow portion 23a of the scale removing punch 23, and the tip portion thereof is the punch 23. It is provided so that it can move forward and backward from the center of the front surface. A cylinder chamber is formed between the bottom surface of the hollow portion 23a of the scale removing punch 23 and the bottom surface of the large-diameter shaft portion 25a, and an air cylinder mechanism 26 for supplying air of a predetermined pressure is connected to the cylinder chamber. .. Further, since the tip of the holding shaft 25 is provided in the center of the front surface of the scale removing punch 23, when the cutting material X and the scale-removing material X0 are held by the tip of the holding shaft 25, the central portions of these materials are held. In any case, it can be pressed against the scale removing die 21 and held, and thus can be held stably and reliably from beginning to end. Since the known air pump is used for the air cylinder mechanism 26, it is omitted.

As the moving mechanism 27, as shown in FIG. 9, an elongated hole 22a extending in the advancing/retreating direction of the ram 4 and opening above the sliding groove is formed in the lower middle portion in the longitudinal direction of the supporting member 22, and the length of the sliding body 24 is increased. A recess 24a is formed in the lower middle part in the vertical direction so as to be in communication with the elongated hole 22a. On the other hand, below the support member 22, a swing rod 29 supported by the machine base 2 so as to be swingable in the front-back direction of the ram 4, and L supported at the tip of the swing rod 29 so as to be swingable in the front-back direction. And a push lever 30 having a shape. One end 30a of the push lever 30 is inserted into the recess 24a of the sliding body 24 through the elongated hole 22a of the support member 22, and the return spring 28 is interposed between the other end 30b and the swing rod 29. Has been done. The return spring 28 is urged in the extension direction so that the push lever 30 always comes into contact with the rear stopper 31 provided on the swing rod 29. Further, for swinging the swing rod 29 back and forth, a cam (not shown) is provided on an appropriate interlocking shaft of the power transmission system for driving the former 1, and the cam drive by this cam is used to move the ram 4 to the die side. It is designed to swing back and forth in synchronization with forward and backward movements.

Next, the operation of the cutting material holding and scale removing device in the hot former configured as described above will be described.

First, the bar material is supplied to the supply unit 3a of the die block 3, and is cut into a predetermined length by the cutting knife 10 on the front surface of the die block 3. Then, as shown in FIG. 4, the cutting material X is transferred to the front position of the solid scale removing die 21 provided in the scale removing station Z0. At this time, the sliding body 24 is located at the rear standby position of the support member, and the small-diameter shaft portion 25b of the holding shaft body 25 is pushed forward from the scale removing punch 23 by the urging force of the air cylinder mechanism 26.

Next, as shown in FIG. 5, the push lever 30 is swung forward together with the swing rod 29 of the moving mechanism 27 at the timing when the cutting material X is transferred to the front surface of the scale removing die 21. By this swinging, the push lever 30 advances the sliding body 24 with respect to the support member 22, and the cutting material X is sandwiched and held in a balanced manner by the front end surface of the holding shaft body 25 and the front end surface of the scale removing die 21. At this time, the holding shaft 25 is slightly pushed back to the scale removing punch 23 side against the urging force of the air cylinder mechanism 26, but the cutting material X and the scale removing punch 23 do not come into contact with each other, and the holding shaft 25 A predetermined gap is maintained also between the rear end surface of 25 and the bottom surface of the scale removing punch 23.

After that, as shown in FIG. 6, during the forward movement of the ram 4, the abutting member 32 provided on one side of the ram 4 comes into contact with the rear end portion of the sliding body 24 located at the holding position of the cutting material X. This contact member 32 moves the sliding body 24 forward while compressing the return spring 28 and swinging the push lever 30 forward. By this forward movement, both the scale removing punch 23 at the front end of the sliding body 24 and the holding shaft body 25 perform upsetting for cutting scale on the cutting material X. That is, as shown in FIG. 6, the large-diameter shaft portion 25a of the holding shaft body 25 is pushed back against the urging force of the air cylinder 26 mechanism until it comes into contact with the bottom surface of the scale removing punch 23, and the front end surface of the holding shaft body 25 is pushed. The upsetting is performed on the cutting material X in a state where the front end surface of the scale removing punch 23 and the front end surface of the scale removing punch 23 are integrated so as to be flush with each other. As a result, the scale is surely dropped to the outside of the die block on the front surface of the scale removing die 21, and the material X0 having a flat drum shape with both ends flat and the middle portion bulging is formed.

After the molding, as shown in FIG. 7, when the ram 4 retracts from the scale removing die 21 side, the return spring 28 expands in association with the retracting operation, and the slide body 24 is swung backward with the push lever 30. Moves backward to the holding position of the cutting material X. At this time, the small-diameter shaft portion 25b of the holding shaft 25 is pushed forward from the front end surface of the scale removing punch 23 by the urging force of the air cylinder mechanism 26, whereby the scale-removed material X0 is retained on the holding shaft body. 25 and the scale removing die 21 are continuously sandwiched to maintain the holding state.

After that, the material X0 held by the holding shaft 25 and the scale removing die 21 is gripped by the open/close chuck mechanism 13 shown in FIG. 4 is transferred to the first-stage forging station Z1 at a timing matched with the forward movement of 4. Further, while the material X0 is gripped by the opening/closing chuck mechanism 13, the push lever 30 is swung backward together with the swing rod 29 of the moving mechanism 27 while the ram 4 is retreating, and as shown in FIG. The swinging of the lever 30 causes the sliding body 24 to retreat from the holding position of the cutting material X on the support member 22 to the original rear standby position.
Such a series of operations are repeatedly performed in the scale removing station Z0.

As described above, according to the cutting material holding and scale removing device in the hot former, the cutting material holding means and the scale removing means are devised between the bar material cutting position and the first forging station. Since they are arranged after being integrally combined, the cutting mechanism X can be surely held by the holding shaft 25 by the forward movement of the sliding body 24 by the moving mechanism 27, and the ram 4 can be maintained while maintaining the holding state. The forward movement of the sliding body 24 is used to advance the scale, and the scale removing punch 23 and the holding shaft body 25 cooperate with the cutting material X held at the front position of the scale removing die 21 to remove the scale. Can be installed. As a result, it is possible to prevent the scale formed on the surface of the cutting material X from remaining in the scale removing die 21 or entering into the forming holes of the die in the multi-stage forging station, which deteriorates the quality of the product and It is possible to prevent adverse effects such as abrasion of the molding holes of. Further, when the ram 4 is moved backward by the combination of the moving mechanism 27 of the sliding body 24, the cylinder mechanism 26 and the return spring 28, the material X0 scaled down by the holding shaft 25 is urged by the urging force of the cylinder mechanism 26. While the holding is continuously performed, the scale removing punch together with the sliding body 24 can be retracted to the original holding position of the cut material X separated from the scaled material X0 by the biasing force of the return spring 28. As a result, the slide body 24 is retracted to the original holding position of the cutting material X, and the scale-removed material X0 is sandwiched and held between the holding shaft body 25 and the scale removing die 21. The material X0 is accurately and surely gripped by the opening/closing chuck mechanism 13 and transferred to the first-stage forging station. In addition, the slide body 24 can be returned from the holding position of the cutting material to the rear standby position of the support member 22 at a timing after the material X0 scaled down by the opening/closing chuck 13 is grasped. As a result, the cutting material holding operation and the scale removing operation at the timing synchronized with the advance/retreat of the moving mechanism 27 and the ram 4 can be repeatedly and favorably performed.

Further, in the above-described embodiment, the ram is composed of the two rams 4 and 5 having different crank angles, and in the forging stations Z2 to Z4 in the second to fourth stages from the start timing in the first stage forging station Z1. The one side portion of the first ram 4 set so that the start timing of the press forming is slightly advanced is brought into contact with the rear end portion of the slide body 24 during the forward movement of the ram 4 and moved forward to scale the cutting material X. Since the contact member 32 for upsetting for dropping is provided, even if a scale removing station Z0 having the cutting material holding and scale removing device 20 is newly provided, it acts on the machine frame during forging. The total maximum load can be effectively distributed and reduced, and deformation of the machine frame and ram twisting can be suppressed to reduce the impact on the product. Further, even when a blanking station is formed that is idled during the terminal processing, similarly, it is possible to suppress the fluctuation of the load load during the blanking and prevent the occurrence of defective products. Although the hot former provided with two rams is provided with the cutting material holding and scale removing device 20 in the embodiment, the invention is not necessarily limited to the one using two rams. Of course, it can be applied to a ram or a type having a large number of rams.

Further, the first urging means is not limited to the air cylinder mechanism of the embodiment shown in the drawings, and it goes without saying that an urging means such as a urging spring may be used. ..

Further, as the transfer chuck for transferring the scale-removed medium-bulge drum-shaped material X0 from the lateral direction to the sandwiching position smoothly and reliably and accurately, and transferring it from the scale removing station Z0 to the first step, Like the opening/closing chuck mechanism 13 in FIG. 2 described above, it has a swinging pawl 13a that greatly opens horizontally on the cutting position side, and a groove-like recess receiving pawl 13b such as a V-shape on the side opposite to the cutting position. It is preferable to use the open/close chuck mechanism provided.

DESCRIPTION OF SYMBOLS 1 Hot former 2 Machine stand 3 Die blocks D1 to D4 Dies P1 to P4 Punches 5, 6 Ram 10 Cutting knife 13 Open/close chuck mechanism 13a Swing claw 13b Recess receiving claw 20 Cutting material holding and upsetting device 21 Scale removal Die 22 Support member 22a Long hole 23 Scale removing punch 24 Sliding body 24a Recess 25 Holding shaft body 26 Air cylinder mechanism (first urging means)
27 moving mechanism 28 return spring (second biasing means)
29 rocking rod 30 push lever 31 rear stopper 32 abutting member

Claims (3)

On the machine stand, a cutting knife for cutting the heated bar material into a material of a predetermined length, a plurality of forging stations for forging the cutting material with a die and a punch, and each punch in these forging stations is provided in a die. A holding device for a cutting material and a scale removing device in a hot former provided with a ram for advancing and retracting, provided at a scale removing station between a bar material cutting position on a machine base and a first-stage forging station. A solid scale removing die, a support member disposed in front of the scale removing die on the machine base, and a front end portion and a rear end portion slidably supported by the support member in the advancing and retracting direction of the ram. And a sliding body projecting outward from the support member and having a scale removing punch at the tip, and a holding shaft body provided in the scale removing punch and provided with a tip end portion capable of moving forward and backward from the front surface of the punch. , A first urging means for constantly pushing the front end portion of the holding shaft forward of the scale removing punch, and a slide body always positioned at a rear standby position of the support member and the cutting material transferred to the front surface of the scale removing die. After the sliding body is moved forward to the supporting member at the specified timing and moved to the holding position of the cutting material by the holding shaft body and the scale removing die, the ram retracts and the scaled material is grasped by the transfer chuck. A moving mechanism for retracting the sliding body from the holding position of the cutting material to the rear standby position of the support member at the timing of, and allowing the sliding body to move forward from the holding position of the cutting material and to the sliding body when moving forward. A second urging means for exerting a returning force to the holding position of the cutting material, and a holding position of the cutting material which is provided on one side of the ram and abuts on the rear end of the sliding body during the forward movement of the ram. An abutting member for forcibly moving the sliding body located in the front against the second biasing means and for upsetting the cutting material for scale removal in the state where the scale removing punch and the holding shaft are integrated. And a scale removing device for holding a cutting material in a hot former, which comprises: As a moving mechanism, an elongated hole extending in the ram advance/retract direction and opening above the sliding groove is formed in the lower middle portion of the supporting member, and communicates with the elongated hole in the lower middle portion of the sliding body. While a recess is formed in the support member, a swinging rod that is supported by the machine base so as to swing in the front-rear direction of the ram at the lower part of the support member and a tip end of the swinging rod that is swingable in the front-rear direction. L-shaped push lever, one end of the push lever is inserted into the recess of the sliding body through the elongated hole of the supporting member, and the lever is always provided between the other end and the swing rod. There is a return spring that urges it to abut the rear stopper provided on the swing rod. Furthermore, the swing rod swings back and forth in synchronization with the forward and backward movement of the ram toward the die side. 2. The cutting material holding/scale removing device in a hot former according to claim 1, wherein the device is interlockingly connected to an interlocking shaft of a power transmission system for driving the former through a cam driving mechanism. The transfer chuck is provided with an opening/closing chuck mechanism having a swinging pawl that opens horizontally on the cutting position side and a V-groove-shaped recess receiving pawl on the side opposite to the cutting position. The apparatus for holding and removing scale of a cutting material in the hot former according to claim 1 or 2.

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