WO2011091643A1

WO2011091643A1 - Material shearing and clamping device for upset machine, working method of the material shearing and clamping device

Info

Publication number: WO2011091643A1
Application number: PCT/CN2010/074299
Authority: WO
Inventors: 杨东佐
Original assignee: Yang Dongzuo
Priority date: 2010-01-28
Filing date: 2010-06-23
Publication date: 2011-08-04
Also published as: CN101797614B; CN101797614A

Abstract

A material shearing and clamping device for an upset machine, and a working method of the material shearing and clamping device are provided. The material shearing and clamping device comprises a material shearing rod (130), a drive mechanism for driving the material shearing rod, a shear tool (157), a clamping mechanism including a clamp tool (138), a clamp tool open mechanism for opening the shear tool and the clamp tool and placing a blank to a preset position. A container for clamping a blank is formed by the interaction of the shear tool and the clamp tool. The material shearing and clamping device further comprises a spacing and resetting mechanism of the clamping mechanism, the spacing and resetting mechanism makes the clamp tool reset and close relative to the shear tool and restricts the movement of the clamp tool in the process of shearing the blank. In feeding position, the width of the container for clamping the blank in the moving direction of the shear tool is greater than the diameter of the blank. In shearing position, the clamp tool keeps immovable relative to the shear tool, and the container for clamping the blank is unchangeable. The bottom of the sheared blank is smooth, the force on the blank is balanceable and the blank does not decline and shake when molding. The tail end -face of the upset forged work piece is smooth, and the molded work piece is of good quality and high accuracy.

Description

Cutting material clamping device of forging machine and working method of cutting material clamping device

Technical field

The invention relates to a trimming and clamping device for a forging machine and a working method for a trimming material, in particular to a die-punching and forging machine for forming a standard part such as a fastener, and a two-mode three-punching machine. The cutting material clamping device and the working method of the cutting material for the upsetting machine, the two-mode four-punching machine, the three-mode three-punching machine, the four-mode four-stroke forging machine, and the like. Background technique

As shown in FIG. 13 , a conventional trimming device for a forging machine includes a trimming rod 200, a shearing rod driving mechanism for driving the reciprocating rod 200 to reciprocate, and a shearing rod fixed to the cutting rod 200. The material cutter 201, the clamping plate connecting seat 202 fixed on the cutting rod 200, the clamping plate 203 rotatably pivotally connected to the clamping plate connecting base 202, and the clamping plate guiding seat 205 fixed on the body 204. The clamping knife 206 pivotally connected to the clamping plate 202 and the clamping knife 207 fixed to the clamping blade 206. The limiting device of the clamping knife holder 206 is a compression spring 208 mounted between the clamping plate 203 and the clamping blade 206. During the process of cutting the blank, the elastic force of the spring of the swinging member is used to limit the clamping of the clamping knife, so that the shearing force will compress the compression spring of the clamping knife, so that the clamping of the clamping knife produces a certain angle of deflection, thereby making the clamping The material knife will be displaced relative to the cutting knife during the process of cutting the blank, and the receiving portion of the blank and the cutting knife will change the blank, so the blank will be deflected and shaken under the action of the shearing force. Since the billet is elastic during the process of cutting the billet, it is first elastically deformed and then sheared, and the skew and sway of the billet during the shearing of the billet causes the bottom end face of the billet to be uneven. Since the bottom end surface of the blank to be cut out is not flat, the force acting on the blank during the upsetting is unbalanced, and the blank will be skewed and swayed during molding, resulting in a large difference in shape between the workpieces, and the forming quality and precision of the workpiece are poor. It is easy to produce defective products; for workpieces that need to be deformed, it is easy to cause the blank to be filled in the mold cavity sometimes, and sometimes it is filled in the mold cavity, the shape difference between the workpieces is larger, and the defective rate is higher; It is difficult to meet the requirements of upsetting the workpiece with a flat end face. Although the full circular shear does not change the holding portion of the blank during the process of cutting the blank, in order to allow the blank to enter, the receiving portion of the full circular shear is directly larger than the diameter of the blank, in the process of cutting the blank Because there is a gap between the blank and the accommodating part, the full circular shear has no clamping force on the blank. If the blank is too long, the blank is easy to be skewed, so the full round shear is not suitable for the cutting and clamping of the long blank. SUMMARY OF THE INVENTION A first object of the present invention is to provide a displacement of a clamping knife without any direction in the process of cutting a blank, and a receiving portion of the clamping blank on the clamping knife and the cutting knife. A trimming device for the upsetting machine that has undergone any changes.

A second object of the present invention is to provide a method in which the cutting knife does not move relative to the cutting blade during the cutting of the blank, and the receiving portion of the clamping blank on the cutting knife and the cutting blade does not change. The method of cutting material for the forging machine.

A trimming device for a forging machine, comprising a trimming rod, a shearing rod driving mechanism for driving the reciprocating movement of the cutting rod, a cutting knife fixed on the cutting rod, and a cutting knife for clamping the blank The clamping mechanism, the clamping mechanism comprises a clamping knife, and the cutting knife and the clamping knife cooperate with each other to form a receiving portion for holding the blank, so that the clamping knife and the cutting knife are opened, and the blank is placed in the set position. a knife opening mechanism; further comprising: a receiving portion for resetting and closing the cutting knife relative to the cutting knife to form a holding blank, and a limit reset mechanism for limiting the movement of the clamping knife during the cutting of the blank; In the feeding position, the width of the receiving portion of the holding blank in the moving direction of the cutting blade is larger than the diameter of the blank; in the trimming position, the clamping knife is fixed relative to the cutting blade, and the receiving portion of the holding blank does not change. The trimming position is the position at which the blank is deformed from the shearing blade and the gripping knife to the position where the blank is cut, i.e., the position in which the blank is cut. During the process of cutting the blank, the clamping knife is completely fixed with respect to the cutting knife, that is, the receiving portion of the holding blank does not change, so that the blank is not deflected and shaken during the cutting process, so that the cutting is cut. The bottom of the blank is flat, which is equivalent to the effect of a full round cut. Since the bottom of the cut blank is flattened and sent to the next step for upsetting, the force acting on the blank is balanced, and the blank is not deflected and shaken during molding, and the forming quality of the workpiece is high and the precision is high. Low; For workpieces that need to be deformed, it is not easy to cause the blank to be filled in the mold cavity sometimes, and sometimes it is filled on the mold cavity, which is more conducive to reducing the defective rate; and the end face of the forged workpiece is flat. Since the knives and the knives can completely clamp the blank during the cutting of the blank, it is suitable for the trimming of the long blank.

As a first improvement of the first solution, the trimming and clamping device further comprises a clamping plate mechanism, the clamping plate mechanism comprises a clamping plate connecting seat fixed to the cutting rod, and a clamping plate connected with the clamping plate connecting seat, The clamping plate guide seat fixed to the body; the clamping knife and the clamping plate are fixed; the limit reset mechanism of the clamping mechanism is a limit reset mechanism of the clamping knife, and the limit reset mechanism of the clamping knife comprises a downward pressing clamp The material plate and the elastic return pressing device for resetting the clamping plate downward. The elastic return pressing device is cut in the blank During the breaking process, the clamping plate is pressed down, and the elastic force is greater than the decomposition force of the blank in the process of cutting the blank, so as to ensure that the clamping knife is relatively cut during the process of cutting the blank. The knives have no relative movement, and the accommodating portion for holding the blank does not change under the action of the blank. Like the effect of the full round shear, the cut blank is flattened.

As a further improvement of the above solution, the accommodating portion for holding the blank comprises a blank accommodating groove provided on the cleaver, and the width of the blank accommodating groove in the moving direction of the dicing blade is smaller than the diameter of the blank; When the knife is pasted, the width of the receiving portion of the holding blank in the moving direction of the cutting blade is smaller than the diameter of the blank; the clamping plate and the clamping plate connecting seat are pivotally connected by the cylindrical pivot, and the pivoting pivotal connection The length of the hole along the moving direction of the cutting blade is greater than the maximum diameter of the pivot; further comprising an elastic reset device for resetting the pivot toward the pivoting hole toward the side of the clamping knife; the limit reset mechanism of the clamping knife further comprises a clip mounted The adjusting member on the material guiding seat; in the feeding position, the adjusting member abuts the clamping knife toward the one end of the clamping knife, the clamping knife does not contact the cutting knife, and the receiving portion of the holding blank moves along the cutting knife The width of the direction is greater than the diameter of the blank; in the trimming position, the adjusting member is not in contact with the clamping knife, and the width of the receiving portion of the holding blank in the moving direction of the cutting blade is equal to the diameter of the blank. The adjusting member adjusts the distance of the clamping knife relative to the cutting knife so that a certain gap is formed between the blank and the accommodating portion, so that the blank enters the accommodating portion. Since the adjusting member is mounted on the clamping plate guiding seat, the clamping knife does not contact the cutting knife, and the pivot hole corresponding to the pivoting hole has a width larger than the maximum diameter of the pivot shaft in the moving direction of the cutting knife, and is driven by the cutting rod. Under the action of the mechanism, the clamping knife and the cutting knife move away from the adjusting member in the direction of the first concave die, and the clamping knife moves toward the cutting knife under the action of the tension spring, and the blank is completely replaced by the clamping knife and the cutting knife. Clamping, so that the blank does not deflect and sway during the process of cutting the blank into a blank. The blank is kept at right angles to the direction of movement of the cutting knife before and after being cut, thus making the bottom of the cut blank Flat, better than the full circular shear displacement.

As a further improvement, the clamping knife is perpendicular to the clamping plate; the pivoting hole that cooperates with the pivot includes two semicircular portions at the ends and a straight portion connecting the two semicircular portions; The side is provided with a convex shaft, and both ends of the pivot protrude from the clamping plate, and the elastic returning device is a tension spring connecting the convex shaft and the pivot shaft on both sides of the clamping plate to horizontally reset the clamping plate. The structure of the pivot hole and the elastic reset device has a simple structure, and is easy to control the distance between the cutter and the cutter, and the action is reliable.

As a first modification of the fourth solution, the elastic return pressing device comprises a spring piece fixed on the guide plate of the clamping plate at one end, and the other end of the elastic piece is pressed against the clamping plate; the adjusting member is z-shaped, including two horizontal ends and two horizontal connections a horizontal end of the adjusting member is mounted on the clamping plate guide seat, and a horizontal end can abut the clamping knife; the receiving groove on the cutting knife is a u-shaped receiving groove, and the holding blank is accommodated The portion is a receiving space formed by the u-shaped receiving groove and the flat portion of the clamping knife disposed on the cutting knife; the U-shaped receiving groove comprises a semi-circular curved groove and a semicircular shape matched with the diameter of the blank Curved groove tangent In the straight portion, the width of the u-shaped groove along the moving direction of the cutting blade is smaller than the diameter of the blank. The shrapnel has a simple structure. The adjustment member is z-shaped, so that the position of the top clamp of the adjustment member can be easily placed close to the position where the cutter is in contact with the cutter. The accommodating portion for holding the blank of such a structure does not need to adjust the concentricity of the accommodating portion of the clamping blank on the clamping knives and the cutting knives, and in the process of the blank being cut in the presence of manufacturing errors The blank is also not deflected and shaken.

As a second modification of the fourth solution, the elastic return pressing device comprises a spring seat fixed on the clamping plate guide seat and a compression spring installed in the spring seat; the adjusting member is z-shaped, including two horizontal ends and connecting the two horizontal ends In the folding line part, a horizontal end of the adjusting member is mounted on the clamping plate guide seat, and a horizontal end can abut the clamping knife; the receiving groove on the cutting knife is a u-shaped receiving groove, and the receiving portion of the blank is held The accommodating space formed by the u-shaped receiving groove and the flat portion of the clamping knife disposed on the cutting knife; the U-shaped receiving groove includes a semi-circular curved groove and a semi-circular arc matching the diameter of the blank The straight portion of the groove is tangent, and the width of the u-shaped groove along the moving direction of the cutting blade is smaller than the diameter of the blank. The elastic resetting and compacting device of the structure has large elastic force, good effect of pressing the clamping plate, and good resetting effect of the clamping plate.

As a second improvement of the first solution, the clamping mechanism further comprises a clamping knife rotatably pivotally connected to the cutting knife or the cutting rod, the clamping knife is fixed at one end of the clamping knife; the clamping knife The opening mechanism further comprises a tension spring installed at one end on the clamping blade and mounted on the cutting rod at the other end; further comprising a clamping plate mechanism, the clamping plate mechanism comprising a clamping plate and a clamping plate fixed to the cutting rod a guiding seat; a first sliding slot in parallel with the cutting direction in the clamping plate guiding seat, the clamping plate is slidably mounted in the first sliding slot; the clamping plate guiding seat is fixed on the body; the clamping knife The set limit reset mechanism is mounted on the clamping plate facing the side of the cutting knife; the limit reset mechanism of the clamping mechanism is a clamp setting limit reset mechanism, and the clamp setting limit reset mechanism includes the pressing of the clamp The slider, the lower limit device of the clamping member pressing the slider, when the cutting rod moves toward the trimming position, the sliding member pressing the slider separated from the clamping knife is returned to the pressing member capable of abutting the clamping knife The reset device of the slider, the limit of the swing angle of the clamp Positioning device; the limiting device for the swinging angle of the clamping blade is an adjusting screw mounted on the guiding plate of the clamping plate; the second sliding groove is provided on the clamping plate in the direction of vertical cutting, and the clamping slider is mounted on the clamping device In the second chute; in the trim position, the clamp presses the slider to the top of the clamp. The clamp knife is pivotally connected to the cutting knife or the cutting rod, and has a simple structure and is convenient for debugging. The clamping knife opening mechanism includes a tension spring, the structure is simple, and the reset effect is good. Since the clamp pressing slider is installed in the chute perpendicular to the trimming direction, no matter the shearing force, the pressing slider has no displacement, and the pressing slider top dead gripper is decorated in the process of cutting the billet. Therefore, it can be ensured that the clamping blade does not have any displacement in any direction during the cutting of the blank, so that the cut blank is flat. The adjusting screw avoids the phenomenon that the clamping knife can not be reset due to the excessive rotation angle of the clamping blade, and the clamping knife and the cutting knife cannot be closed. As a common improvement of the above solution, the opening mechanism of the entraining mechanism includes a top piece, and the top piece is fixed with a large sliding block that moves the die back and forth toward the punching direction, and the top piece faces the end surface of the clamping plate as a bevel; the cutting bar drive The mechanism is a connecting rod driving mechanism, comprising a connecting rod and a sliding plate, one end of the connecting rod is pivotally connected with the sliding plate; a third sliding slot is arranged in the sliding plate, the third sliding groove is bent toward the side of the body, and the sliding is mounted on the cutting rod The shaft is placed in the third chute of the L-shape. The top piece is mounted on the large sliding block, and when the cutting material clamping device sends the blank to the set position, that is, the first forming concave die, the top piece moves toward the first concave die together with the large sliding piece, and the top piece makes the material The knife is opened relative to the cutter, and the die punches the blank into the first die. Therefore, the top piece is mounted on the large sliding block, and the movement of the large sliding block can be used to complete the separation of the clamping knife and the cutting knife, and the structure is simple and the movement is reliable.

A method of working on a trimming material for a trimming device of a upsetting machine according to claim 1, comprising:

In the feeding position, the blank enters into the receiving portion of the holding blank, and under the action of the cutting rod driving mechanism, the cutting and clamping device moves from the feeding position to the first concave mold position to the cutting position, in the shearing The material position, the blank is cut, the clamping knife has no relative movement with respect to the cutting knife, and the receiving portion of the holding blank does not change; the cutting material clamping device holds the sheared blank from the cutting position to the first concave mold position Staying, the die moves toward the die, the cutter opening mechanism causes the clamp to open relative to the cutter, the workpiece is punched into the first die by the die, and the workpiece is punched into the first die in the first die The material device moves to the feeding position, or the die moves back after the first molding of the workpiece is completed, and the clamping knife is reset and the cutting knife is closed under the action of the limit reset mechanism of the clamping mechanism, the clamping knife and the cutting material The knives cooperate to form a receiving portion for holding the blank. After the die returns to the set position, the trimming device moves from the first die position to the feeding position under the action of the trimming rod driving mechanism; This working method is reliable.

As an improvement of the scheme 9, the invention also includes a clamping plate mechanism, wherein the clamping plate mechanism comprises a clamping plate connecting seat fixed with the cutting rod, a clamping plate pivotally connected with the clamping plate connecting seat, a clamping knife and a clamping plate Fixing, the opening mechanism of the clamping mechanism comprises a top piece fixed with the large slider;

Working methods include:

In the trimming position, the elastic return pressing device presses the clamping plate downward during the process of cutting the blank, and the elastic force is greater than the breaking force of the blank acting on the clamping cutter during the cutting process of the blank, the clamping plate The cutting knife has no movement relative to the cutting knife, and the clamping knife fixed on the clamping plate has no movement relative to the cutting knife; during the opening process of the clamping knife relative to the cutting knife, the top clamping plate of the top piece and the top piece overcome the elastic reset pressure The elastic force of the clamping device rotates the clamping plate relative to the pivoting shaft, and the clamping plate drives the clamping knife fixed thereon to rotate relative to the pivoting shaft, so that the clamping knife is opened relative to the cutting knife; the clamping knife is opposite to the cutting material During the closing process of the knife, the top piece is separated from the clamping plate, and the clamping plate is pressed against the gravity and elastic return of the clamping plate and the clamping knife. Under the elastic force of the device, the downward movement is quickly reset, and the clamping knife and the cutting knife form a receiving portion for holding the blank.

As a further improvement, the clamping plate is connected to the clamping plate connecting seat through a pivot shaft, and the pivoting hole of the pivot shaft cooperates with the clamping hole to move back and forth in the moving direction of the cutting knife, and the limiting position resetting mechanism of the clamping knife further comprises an adjusting member;

Working methods include:

In the feeding position, the clamping knife is supported by the adjusting member, and the pivot shaft moves relative to the pivoting hole to the side away from the clamping knife, and the clamping knife and the cutting knife are separated by a set distance, and the holding of the blank is held. The width of the portion along the moving direction of the cutting knife is larger than the diameter of the blank, and the blank has a certain gap between the entering portion and the receiving portion of the holding blank;

The trimming device moves from the feeding position to the first die position to the trimming position, the clamping knife is separated from the adjusting member, and the pivot moves relative to the pivot hole to the side close to the clamping knife, the clip The knife moves relative to the trimming knife, and the moving distance is equal to the distance that the pivot shaft moves relative to the pivoting hole, and the width of the receiving portion of the holding blank along the moving direction of the cutting knife is equal to the diameter of the blank, and the blank is clamped by the cutter and the cutter The knife is fully clamped;

The width of the receiving portion of the holding blank in the moving direction of the cutting blade is smaller than the blank when the cutting member is separated from the clamping plate to close the cutting knife to the feeding position of the cutting device. Diameter

The blank is kept at right angles to the direction of movement of the cutting knife before and after being cut. The invention has the beneficial effects that in the process of cutting the blank, the limit resetting mechanism causes the clamping knife to have no displacement in any direction at the cutting position, and the clamping knife is completely fixed with respect to the cutting knife, that is, the blank is clamped. The accommodating portion does not change, the blank is not deflected and swayed, so that the bottom of the blank to be trimmed is flat, the forming quality of the workpiece is good and the precision is high, and the defective rate is low; for the workpiece requiring large deformation, the blank is not easily caused Sometimes it is filled on the side of the mold cavity, and sometimes it is filled on the side of the mold cavity, which is more conducive to reducing the defective rate; and the end face of the forged workpiece is flat.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a upsetting machine according to a first embodiment of the present invention.

Fig. 2 is a perspective view showing the structure of Fig. 1 with the trimming seat removed.

Fig. 3 is a perspective view showing a part of the member of the trimming material picking device of the first embodiment of the present invention.

Fig. 4 is a view showing a part of the structure in which the chuck and the cutter are closed together in the first embodiment of the present invention.

Fig. 5 is a perspective view showing the main part of the material cutting device of the second embodiment of the present invention.

Figure 6 is a partial view showing the structure of the cutting knife and the cutting knife of the second embodiment of the present invention closed together; Intention.

Figure 7 is a perspective view showing a part of a member of a trimming material pick-up apparatus according to a third embodiment of the present invention.

Figure 8 is a perspective view of the projection of Figure 7 from another direction.

Fig. 9 is a perspective view showing the upsetting machine of the fourth embodiment of the present invention.

Fig. 10 is a perspective view showing the upsetting machine of the fifth embodiment of the present invention.

Figure 11 is a perspective exploded view of the material cutting device of the fifth embodiment of the present invention.

Fig. 12 is a perspective view showing the upsetting machine of the sixth embodiment of the present invention.

Figure 13 is a perspective view of a prior art upsetting machine. detailed description

Example 1

As shown in FIG. 1 and FIG. 3, a trimming device for a forging machine includes a trimming rod 1, a shearing rod driving mechanism for driving the reciprocating movement of the cutting rod 1, and a clip fixed on the cutting rod 1. a material plate connecting seat 2, a clamping plate 3 pivotally connected to the clamping plate connecting seat 2, a cutting knife 4 fixed on the cutting rod 1, and a pivoting connection on the cutting knife 4 a clamping blade 5 is fixed at one end of the clamping blade 5; a receiving portion for holding the blank is provided on an end surface corresponding to the cutting blade 4 and the clamping blade 6; On the clamping plate 3, the clamping knife 6 and the cutting knife 4 are closed to hold the blank, and the cutting tool 5 is not displaced in any direction at the cutting position, and the holding portion of the holding blank does not change. The limit reset mechanism of the blade 5 and the cutter opening mechanism for opening the cutter 6 and the cutter 4 to position the blank 44 at the first die position.

As shown in FIG. 1 and FIG. 2, the cutting rod driving mechanism is a connecting rod driving mechanism, including a connecting rod joint 7, a connecting rod joint 7, a connecting rod 8 and a sliding plate 9, and one end of the connecting rod 8 is fixed on the connecting rod joint 7. The other end is rotatably pivotally coupled to the slider 9. The connecting rod joint 7 is rotatably pivotally connected to the first large gear 10, and the first large gear 10 is mounted on the two shafts 11 of the upsetting machine. The pivoting shaft 12 of the connecting rod joint 7 is different from the two shafts 11 , first The bull gear 10 meshes with a first pinion 14 mounted on the crankshaft 13. The slide plate 9 is slidably mounted in the slide chute 16 of the trim holder 15, and a shear bar chute 17 perpendicular to the slide chute 16 is further disposed on the top surface of the trim holder 15, and the trim bar 1 can be back and forth It is slidably mounted in the trim bar chute 17. On the side of the trim holder 15 away from the body 18, a trim seat cover 19 that cooperates with the slide plate 9 to restrict the slide plate 9 in the slide chute 16 is mounted, and a shear is mounted on the side of the trim seat 15 close to the body 18. The bottom plate 20 of the material base is further fixed with an L-shaped shear rod abutting member 21 on a side of the shearing seat 15 adjacent to the shearing seat cover 19, and is fixed on both sides of the cutting rod 1 and above the cutting holder 15 A copper pressure plate 22, a copper pressure plate 23, which cooperates with the trimming rod 1 to restrict the sliding of the cutting rod 1 in the cutting rod chute 17. An L-shaped chute 24 is provided in the slide plate 9, and a slide shaft 25 mounted on the trimming rod 1 is placed in the L In the chute 24 of the type, the chute 24 is bent toward one side of the body 18. The trimming seat 15 is fixed to the body 18. A clamping plate guide seat 26 is further fixed on the upper side of the body 18. The clamping plate 3 is mounted in the first sliding groove 27 of the clamping plate guiding seat 26, and the clamping plate 3 is fixed above the clamping plate guiding seat 26. A pressure plate 28 is defined in the chute 24.

As shown in FIG. 4, the accommodating portion for holding the blank is a semi-circular accommodating groove 29 which is disposed on the cutting knives 4 for accommodating the blank, and an arc-shaped accommodating groove which is disposed on the clamping knives 6 and cooperates with the cutting knives 4. 30; the arc-shaped receiving groove 30 is concentric with the semicircular receiving groove 29 and has the same radius; the clamping knife 6 is connected to the center of the arc-shaped receiving groove at the center of the pivoting shaft of the clamping blade 5, and is connected to the center. In the range of the tangent to the intersection of the arc-shaped accommodating groove and the angle of 90° formed toward the cutting blade 4, in order to avoid the empty space 31 of the cutting blade 4 when the clamping blade 5 rotates, avoid the space The space 31 is larger than 90 °, which reduces the machining accuracy and ensures that the cutter 6 does not interfere with the blank 44 when it is opened.

As shown in Fig. 3, the clamp knife limit limit reset mechanism includes a swing pressing slider 32, a lower limit device of the swing pressing slider 32, and an elastic reset device, and a limit device for the swing angle of the clamp knife 5 . A second chute 33 is provided on the sandwiching plate 3 in a vertical cutting direction. The pendulum pressing slider 32 is mounted in the second chute 33, and the second chute 33 is parallel to the moving direction of the large slider. The elastic returning device comprises a resetting pressure spring 34, a fixing plate 35 fixed on the clamping plate 3, one end of which is mounted on the tensioning rod 36 of the pendulum pressing slider 32 through the fixing plate 35, and the resetting pressure spring 34 is mounted on the pulling rod 36. . The lower limit device of the clamp pressing slider 32 includes a projection 37 extending from the side of the swing pressing slider 32 and a stopper 38 fixed to the sandwiching plate 3, and the stopper 38 is placed in the projection 37. Just below. On the pendulum pressing slider 32, a beveling surface 45 is provided at the trimming position to eliminate the mounting clearance between the pendulum pressing slider 32 and the engraving blade pendulum 5, and the engraving blade 5 is provided with a bevel that cooperates with the bevel 45. 46. The clamping device 5 is a tilting angle limiting device which is an adjusting screw 39 mounted on the clamping plate guide seat 26.

As shown in FIG. 1 and FIG. 3, the cutter opening mechanism includes a tension spring 40 whose one end is mounted on the clamp knife 5 and the other end is mounted on the trim rod 1, and the workpiece of the clamp knife 5 is pressed. The top slider 41 is separated from the clamp slider 5 at the first female mold position. The tension spring 40 is mounted at one end of the cutter blade 5 remote from the cutter 6. The top member 41 is mounted on a large slider 42 for moving the die back and forth in the punching direction, and a bevel 43 for pressing the bottom surface of the slider 32 is provided on the end surface of the top member 41 away from the large slider 42.

When the trimming device moves from the position of the trimming material to the position of the first die, the top piece 41 moving together with the die presses the slider 32 from the lower topping member, and the pendulum pressing slider 32 moves upward, and the clip The knife holder 5 separates and continues to move upwards for a distance, while the clamp knife 5 rotates under the elastic force of the tension spring 40, the cutter 6 is opened relative to the cutter 5, and the die punches the blank into the first die. Inside. After the blank delivery is completed, the trimming and clamping device is again moved from the first die position to the trim position. Movement, during the movement, the pendulum pressing slider 32 is separated from the top piece 41, the compression spring 34 causes the pendulum pressing the slider 32 to move downward, and the pendulum pressing the slider causes the clamping blade 5 to rotate in the opposite direction, thereby The clamping knife 6 and the cutting knife 4 are completely closed and completely clamp the clamping knife 5 . This reciprocating motion. During the process of cutting the blank, since the clamping knife 5 is completely killed by the clamping pressing block 32, the clamping blade 32 does not have any displacement, and the receiving portion of the holding blank does not change, so it is cut. The blank end face of the material blank is flat, and the full round shear effect can be achieved.

Example 2

As shown in Fig. 5, unlike the first embodiment, the clamp blade limit return mechanism includes a swing pressing slider 50 and a reset block 52 fixed to the chuck guide 51. A first return ramp is provided on a side of the swing pressing slider 50 toward the reset block 52. The first reset ramp 53 is located at an upper portion of the swing pressing slider 50. A second reset ramp 54 that cooperates with the first return ramp 53 is provided on the reset block 52. The second reset ramp 54 is located above the first reset ramp 53. A second chute 55 is disposed on the clamping plate 58 in a vertical cutting direction. The pendulum pressing slider 50 is mounted in the second chute 55, and the second chute 55 is perpendicular to the moving direction of the large slider. A protrusion 56 is disposed on a side of the clamp pressing slider 50, and a stopper 57 is disposed directly under the protrusion 56. The stopper 57 is fixed on the clamping plate 58, and the stopper 57 restricts the sliding of the decoration. Block 50 is displaced downward. An adjusting screw 62 for limiting the swinging angle of the gripper swinging member 61 is provided on the clamping plate guide seat 51. The adjusting screw 62 prevents the clamping blade 61 from rotating under the tension of the tension spring 63, and the cutting angle is excessive. The pinch slider 50 does not close the cutter knife 59 and the cutter blade 60.

As shown in FIG. 6, the accommodating portion for holding the blank is an accommodating space formed by the U-shaped accommodating groove provided on the knives 60 and the flat portion 64 of the nipper 59; the U-shaped accommodating groove 64 includes a semicircular arc groove 65 matched with the diameter of the blank and a straight portion 66 tangential to the semicircular arc groove 65; the U-shaped receiving groove has the same length and width.

When the trimming device moves from the position of the trim to the position of the first die, the pendulum pressing slider 50 completely leaves the reset block 52, and the top piece 67 moving together with the die presses the slider 50 from the lower pendulum. The pendulum pressing slider 50 moves upward, separates from the pinch blade 61 and continues to move upward by a distance, and the pinch blade 61 rotates under the elastic force of the tension spring 63, and the clamping knife is opened relative to the cutting blade. At the same time, the die punches the blank into the first die. After the blank delivery is completed, the trimming and clamping device moves from the first die position to the trim position. During the movement, the pendulum pressing slider 50 leaves the top piece 67, and the reset block 52 causes the pendulum to press the slider 50 toward Under the movement, the pendulum pressing slider 50 rotates the gripper blade 61 in the opposite direction, so that the gripper 59 and the trimming blade 60 are completely closed and completely clamps the gripper. This reciprocating motion. In the process in which the blank is cut, since the clamp knife 61 is completely killed by the clamp pressing slider 50, the cutter 59 is not displaced in any direction, and the blank is clamped. The accommodating portion does not change, so the trim end face of the blank to be trimmed is flat, and the full round shear effect can be fully achieved.

Example 3

As shown in Figs. 7 and 8, unlike the first embodiment, the sandwiching plate 101 is L-shaped and is directly fixed to the cutting bar 102. The second chute 103 is parallel to the moving direction of the large slider; the resetting device of the pendulum pressing slider 104 includes a compression spring (not shown), and a zigzag spring pressing plate 105 fixed to the clamping plate 101, one end of which passes through The spring pressure plate 105 is mounted on the pull rod 106 of the swing pressing slider 104. The pressure spring is mounted on the pull rod 106 and placed between the swing pressing slider 104 and the spring pressing plate 105. The top member 107 is pressed against the slider 104. The face 108 is perpendicular to the direction of movement of the large slider.

When the trimming and clamping device moves from the position of the trimming material to the position of the first female die, the top piece 107 moving together with the die presses the slider 104 from the top piece moving direction, and the pendulum presses the slider 104 and the top. The workpiece moves in the same direction, and is separated from the clamp knife 109. At this time, the clamp knife 109 rotates under the elastic force of the tension spring 110, and the clamp knife 111 is opened relative to the cutter 102, and the die punches the blank into the first Inside the die. After the blank delivery is completed, the trimming and clamping device moves from the first die position to the trim position. During the movement, the pendulum pressing slider 104 is separated from the top piece 107, and the pressing spring causes the pendulum to press the slider 104 toward When the top piece moves in the direction, the pendulum pressing slider rotates the pinch blade 109 in the opposite direction, so that the pinch blade 111 and the cutting blade are completely closed and the gripper blade 109 is completely killed. This reciprocating motion. During the process of cutting the blank, since the clamping blade 109 is completely killed by the clamping pressing block 104, the clamping blade 109 is not displaced in any direction, and the receiving portion of the holding blank does not change, so it is cut. The blank end face of the material blank is flat, and the full round shear effect can be achieved.

Example 4

As shown in FIG. 9, unlike the first embodiment, the trimming rod driving mechanism includes a cam 120, a swinging member 121, a roller 122 mounted on the swinging member 121, and a connecting rod rotatably pivotally coupled to the swinging member 121. 123, the sliding plate 124 pivotally connected to the connecting rod 123, and the tension spring 125 is reset. The cam 120 is mounted coaxially with the first large gear 126. The reset spring 125 is mounted on a screw 128 fixed to the crankshaft limit plate 127, and one end is attached to a screw 129 fixed to the slider 124. During rotation of the cam 120, the roller 122 can be coupled to the oscillating member 121 such that the slider is reciprocated linearly back and forth by the different radii of the cam 120 and the pulling force of the return tension spring 125.

Example 5

As shown in FIG. 10 and FIG. 11, unlike the first embodiment, the clamping plate mechanism includes a clamping plate connecting seat 131 fixed to the trimming rod 130, and the clamping plate connecting seat 131 passes through the cylindrical pivot 133. The clamping plate 134 is connected to the clamping plate guiding seat 136 fixed to the body 135, so that the pivot 133 faces the clamping material. The plate pivoting hole 137 is close to the elastic reset device of the clamp 138-side reset. A sliding groove 139 is provided in the clamping plate guide seat 136 in parallel cutting direction, and the clamping plate 134 is slidable back and forth and mounted in the sliding groove 139. The pivot hole 137 of the clamping plate 134 that cooperates with the pivot 133 includes two semicircular portions at the ends and a straight portion connecting the two semicircular portions; and a convex shaft 143 is provided on both sides of the sandwiching plate 134. The two ends of the pivot 133 are mounted on the clamping plate connecting seat 131 and protrude from the clamping plate connecting seat 131. The elastic returning device is connected between the protruding shaft 143 and the pivot 133 on both sides of the clamping plate 134 for clamping. The tension springs 144, 145 of the plate 134 are horizontally reset.

As shown in FIG. 10, a fixing groove 146 is disposed on one side of the clamping plate 134. The fixing groove 146 is away from the clamping plate connecting seat 131. A clamping knife fixing seat 147 is fixed in the fixing groove 146, and the clamping knife 138 is fixed. It is fixed on the clamp holder 147 and perpendicular to the sandwich plate 134.

As shown in FIG. 10, the limit reset mechanism of the clamping mechanism is a limit reset mechanism of the clamp 138, and the limit reset mechanism of the clamp 138 includes pressing the clamp plate 134 downward and the clamp plate 134 downward. The reset elastic return pressing device and the adjusting member 149 mounted on the clamp plate guide 136. The elastic return pressing device comprises a spring seat 150 fixed on the clamping plate guide seat 136. The clamping plate mounted in the spring seat 150 abutting the clamping plate 134 presses the small shaft 151, and the clamping plate abuts the small shaft. A compression spring 152 of 151; an adjustment screw 153 mounted on the spring seat 150 for pressing the compression spring 152, and a lock nut 154 on the adjustment screw 153. The adjustment member 149 is of a meandering type, including a horizontal end 155, a horizontal end 156 and a fold line portion (not shown) connecting the two horizontal ends. The horizontal end 155 of the adjusting member 149 is mounted on the clamping plate guide seat 136, and the horizontal end 156 can be abutted. The clamp knife 138 is connected. In the feeding position, the adjusting member 149 abuts the clamping knife 138 toward the horizontal end 156 of the clamping knife 138. The clamping knife 138 does not contact the cutting knife 157, and the receiving portion of the holding blank moves along the cutting blade 157. The width is greater than the diameter of the blank; at the trim position, the width of the receiving portion of the holding blank along the direction of movement of the cutting blade 157 is equal to the diameter of the blank.

As shown in FIG. 10, the accommodating portion for holding the blank includes a U-shaped accommodating groove 158 provided on the cutting blade 157, and the accommodating portion for holding the blank is a U-shaped accommodating groove provided on the cutting blade 157. The accommodating space formed by the 158 and the flat portion of the clamp 138; the U-shaped accommodating groove 158 includes a semi-circular curved groove matching the diameter of the blank and a straight portion tangential to the semi-circular curved groove, U-shaped The width of the groove along the direction of movement of the cutting blade 157 is smaller than the diameter of the blank.

As shown in Fig. 10, the working method of the trimming material of the trimming device of the upsetting machine includes: In the feeding position, the gripper 138 is held by the adjusting member 149, and the pivot 133 is opposite to the pivoting hole.

137 is moved to a side away from the clamp 138, the cutter 138 and the cutter 157 are separated by a set distance, and the width of the receiving portion of the holding blank along the moving direction of the cutter 157 is larger than the diameter of the blank, and the blank enters. In the accommodating portion for holding the blank, there is a certain time between the entry of the blank and the accommodating portion of the holding blank Clearance.

Under the action of the driving mechanism of the trimming rod 130, the trimming and clamping device moves from the feeding position to the trimming position in the direction of the first die, the clamping knife 138 is separated from the adjusting member 149, and the pivot 133 is pivotally connected The hole 137 is moved to a side close to the clamping knife 138, and the clamping knife 138 moves relative to the cutting blade 157, and the moving distance is equal to the distance that the pivot shaft 133 moves relative to the pivoting hole 137, and the receiving portion of the holding blank is cut along the cutting edge. The width of the direction of movement of the knife 157 is equal to the diameter of the blank, and the blank is completely clamped by the cutter 138 and the cutter 157.

In the trimming position, under the action of the driving mechanism of the trimming rod 130, the trimming and clamping device continues to move toward the position of the first die, and the blank is cut; in the trimming position, the elastic resetting and pressing device is cut in the blank. During the process, the clamping plate 134 is pressed downward, and the elastic force is greater than the decomposition force of the blank acting on the clamping knife 138 during the process of cutting the blank, and the clamping plate 134 has no movement relative to the cutting knife 157, and is fixed to the clamping material. The cutter 138 on the plate 134 has no movement relative to the cutter 157, and the receiving portion for holding the blank does not change.

Under the action of the driving mechanism of the trimming rod 130, the trimming and clamping device holds the sheared blank from the trimming position to the first die position, and the die moves toward the die, and the top member 148 is sandwiched by the top plate 134. The top member 148 overcomes the elastic force of the elastic return pressing device, so that the clamping plate 134 rotates relative to the pivoting shaft, and the clamping plate 134 drives the clamping knife 138 fixed thereon to rotate relative to the pivoting shaft, so that the clamping knife 138 The cutting knife 157 is opened, and the workpiece is punched into the first concave mold by the die;

The workpiece is punched into the first concave die by the die clamping device to move to the feeding position, or the die is moved back after the first molding of the workpiece is completed, the top piece 148 is separated from the clamping plate 134, and the clamping plate 134 is separated. Under the action of the gravity of the clamping plate 134, the clamping knife 138 and the elastic force of the elastic return pressing device, the clamping device 138 and the cutting blade 157 form a receiving portion for holding the blank; from the top member 148 After leaving the clamping plate 134 to close the cutting knife 138 relative to the cutting knife 157 until the cutting material clamping device moves to the feeding position, the width of the receiving portion of the clamping blank along the moving direction of the cutting blade 157 is smaller than the blank. diameter of;

After the die returns to the set position, the trimming device moves from the first die position to the feed position by the driving mechanism of the trim bar 130;

The blank is kept at right angles to the direction of movement of the cutter 157 before and after being cut. Example 6

As shown in FIG. 12, different from the embodiment 5, the elastic return pressing device includes a spring piece 172 fixed to the clamping plate guide seat 171 by a screw 170 at one end, and the other end of the elastic piece 172 is mounted with a pressing member 173, which is pressed. The piece 173 compresses the clamping plate 174.

Claims

Claim

1. A material cutting device for a forging machine, comprising a cutting rod, a cutting rod driving mechanism for driving the reciprocating movement of the cutting rod, a cutting knife fixed on the cutting rod, and a clamping knife for clamping The clamping mechanism of the blank, the clamping mechanism comprises a clamping knife, and the cutting knife and the clamping knife cooperate with each other to form a receiving portion for holding the blank, so that the clamping knife and the cutting knife are opened and the blank is placed at the set position. The clamping knife opening mechanism is characterized in that: a receiving mechanism for resetting and closing the clamping knife with respect to the cutting knife to form a holding blank, and a cutting mechanism for restricting the movement of the clamping knife during the cutting of the blank is further provided The limit reset mechanism; in the feeding position, the width of the receiving portion of the holding blank along the moving direction of the cutting knife is larger than the diameter of the blank; in the trimming position, the clamping knife is fixed relative to the cutting knife, and the blank is held The housing does not change.

2. The trimming device for a upsetting machine according to claim 1, further comprising: a clamping plate mechanism, wherein the clamping plate mechanism comprises a clamping plate connecting seat fixed to the cutting rod, and a clamp a clamping plate connected to the connecting plate of the material board, and a clamping plate guiding seat fixed to the body; the clamping knife and the clamping plate are fixed; the limit resetting mechanism of the clamping mechanism is a limit resetting mechanism of the clamping knife, the clamping knife The limit reset mechanism includes an elastic return pressing device that presses the clamping plate downward and resets the clamping plate downward.

3. The trimming and clamping device for a upsetting machine according to claim 2, wherein: the receiving portion for holding the blank comprises a blank receiving groove provided on the cutting knife, and the blank receiving groove is cut along the cutting The width of the moving direction of the material knife is smaller than the diameter of the blank; when the clamping knife is matched with the cutting knife, the width of the receiving portion of the holding blank along the moving direction of the cutting knife is smaller than the diameter of the blank; the clamping plate and the clamping plate The connecting seat is pivotally connected by the cylindrical pivot, and the length of the pivoting hole matched with the pivoting tool in the moving direction of the cutting blade is greater than the maximum diameter of the pivoting shaft; further comprising resetting the pivoting shaft toward the pivoting hole toward the side of the clamping knife The elastic reset device; the limit reset mechanism of the clamp knife further comprises an adjusting member mounted on the clamping plate guide seat; in the feeding position, the adjusting member abuts the clamping knife toward the end of the clamping knife, the clamping knife and the shearing tool The feeding knife does not contact, the width of the receiving portion of the holding blank in the moving direction of the cutting knife is larger than the diameter of the blank; in the trimming position, the adjusting member does not contact the clamping knife, and the receiving portion of the holding blank is along the cutting knife The width of the direction of motion is equal to the diameter of the blank.

4. The trimming and clamping device of a upsetting machine according to claim 3, wherein: the clamping knife is perpendicular to the clamping plate; the pivoting hole that cooperates with the pivot includes two semicircles of the end portion. a shape portion and a straight portion connecting the two semicircular portions; a convex shaft is arranged on both sides of the sandwiching plate, and both ends of the pivot shaft protrude from the clamping plate, and the elastic reset device is a convex joint connected to both sides of the clamping plate A tension spring that axially resets the clamping plate between the shaft and the pivot.

5. A material cutting device for a upsetting machine according to claim 4, wherein: the elastic compounding The position pressing device comprises a spring piece fixed at one end of the clamping plate guide seat, and the other end of the elastic piece is pressed against the clamping plate; the adjusting member is z-shaped, comprising two horizontal ends and a folding line connecting the two horizontal ends, and a horizontal end of the adjusting member Installed on the clamping plate guide seat, a horizontal end can abut the clamping knife; the receiving groove on the cutting knife is a u-shaped receiving groove, and the receiving portion for holding the blank is a U disposed on the cutting knife The accommodating space formed by the accommodating groove and the flat portion of the clamping knives; the U-shaped accommodating groove includes a semicircular curved groove matching the diameter of the blank and a straight portion tangential to the semicircular curved groove, u The width of the groove along the direction of movement of the cutting blade is smaller than the diameter of the blank.

6. The trimming and clamping device of a upsetting machine according to claim 4, wherein: the elastic return pressing device comprises a spring seat fixed on the guiding plate of the clamping plate, and a compression spring installed in the spring seat. The adjusting member is Z-shaped, including two horizontal ends and a folding line connecting the two horizontal ends, a horizontal end of the adjusting member is mounted on the clamping plate guiding seat, and a horizontal end can abut the clamping knife; the capacity on the cutting knife The groove is a U-shaped accommodating groove, and the accommodating portion for holding the blank is a accommodating space formed by the U-shaped accommodating groove and the flat portion of the knives disposed on the knives; the U-shaped accommodating groove includes The semicircular arc groove of the blank diameter is matched with the straight portion tangential to the semicircular arc groove, and the width of the U-shaped groove along the moving direction of the cutting blade is smaller than the diameter of the blank.

7. The material cutting device of a upsetting machine according to claim 1, wherein: the material feeding mechanism further comprises a clamping knife rotatably pivotally connected to the cutting knife, and the clamping knife is fixed. The clamping knife opening mechanism further comprises a tension spring mounted on the clamping blade at one end and mounted on the cutting rod at the other end; and a clamping plate mechanism, the clamping plate mechanism comprises a clamping plate fixed clamping plate and a clamping plate guiding seat; a first sliding groove parallel to the cutting direction is arranged in the clamping plate guiding seat, and the clamping plate is slidably mounted in the first sliding slot; The material guiding seat is fixed on the body; the clamp setting limit resetting mechanism is mounted on the clamping plate facing the side of the cutting knife; the limit resetting mechanism of the clamping mechanism is a clamping knife setting limit reset mechanism, The clamp knife limit limit reset mechanism includes a pendulum pressing slider, and the lower limit device of the pendulum pressing the slider, and the pendulum pressing the slider to be separated from the clipping tool when the trimming bar moves toward the trimming position To the clamp that can abut the clamp of the clamp, press the slider The resetting device, the limiting device for the swinging angle of the clamping blade swinging device; the limiting device for the swinging angle of the clamping knife swinging member is an adjusting screw mounted on the guiding plate of the clamping plate; the vertical cutting direction is provided on the clamping plate The second chute, the clamping pressing slider is installed in the second chute; in the trimming position, the clamping member presses the slider to the top of the clamping knife.

The material cutting device for a upsetting machine according to any one of claims 1 to 7, wherein: the opening mechanism of the material feeding mechanism comprises a top piece, and the top piece and the die are oriented toward the punching direction. The large slider for moving back and forth is fixed, and the end piece is inclined to the end surface of the clamping plate; the driving mechanism of the cutting rod is a connecting rod driving mechanism, including a connecting rod and a sliding plate, one end of the connecting rod is pivotally connected with the sliding plate; Third chute, The third chute is bent toward one side of the body, and the sliding shaft mounted on the trimming rod is placed in the L-shaped third chute.

9. A method of working on a trimming material for a trimming device of a upsetting machine according to claim 1, comprising:

In the feeding position, the blank enters into the receiving portion of the holding blank, and under the action of the cutting rod driving mechanism, the cutting and clamping device moves from the feeding position to the first concave mold position to the cutting position, in the shearing The material position, the blank is cut, the clamping knife has no relative movement with respect to the cutting knife, and the receiving portion of the holding blank does not change; the cutting material clamping device holds the sheared blank from the cutting position to the first concave mold position Staying, the die moves toward the die, the cutter opening mechanism causes the clamp to open relative to the cutter, the workpiece is punched into the first die by the die, and the workpiece is punched into the first die in the first die The material device moves to the feeding position, or the die moves back after the first molding of the workpiece is completed, and the clamping knife is reset and the cutting knife is closed under the action of the limit reset mechanism of the clamping mechanism, the clamping knife and the cutting material The knives cooperate to form a receiving portion for holding the blank. After the die returns to the set position, the trimming device moves from the first die position to the feeding position under the action of the trimming rod driving mechanism;

10. The method of working on a trimming material for a upsetting machine according to claim 9, further comprising: a clamping plate mechanism, wherein the clamping plate mechanism comprises a clamping plate connecting seat fixed to the cutting rod. a clamping plate pivotally connected to the clamping plate connecting seat, the clamping knife and the clamping plate are fixed, and the opening mechanism of the clamping mechanism comprises a top piece fixed to the large sliding block;

Working methods include:

In the trimming position, the elastic return pressing device presses the clamping plate downward during the process of cutting the blank, and the elastic force is greater than the breaking force of the blank acting on the clamping cutter during the cutting process of the blank, the clamping plate The cutting knife has no movement relative to the cutting knife, and the clamping knife fixed on the clamping plate has no movement relative to the cutting knife; during the opening process of the clamping knife relative to the cutting knife, the top clamping plate of the top piece and the top piece overcome the elastic reset pressure The elastic force of the clamping device rotates the clamping plate relative to the pivoting shaft, and the clamping plate drives the clamping knife fixed thereon to rotate relative to the pivoting shaft, so that the clamping knife is opened relative to the cutting knife; the clamping knife is opposite to the cutting material During the closing process of the knife, the top piece is separated from the clamping plate, and the clamping plate is moved downward by the gravity of the clamping plate, the gravity of the clamping knife and the elastic force of the elastic return pressing device, and the clamping knife and the cutting knife are formed. Holding the receiving portion of the blank.

11. A method of working on a trimming material for a upsetting machine according to claim 10, wherein: the clamping plate is connected to the clamping plate connecting seat by a pivot, and the pivoting hole of the pivot shaft is matched with the pivoting hole. The utility model can move back and forth in the moving direction of the cutting knife, and the limit reset mechanism of the clamping knife further comprises an adjusting component;

Working methods include: In the feeding position, the clamping knife is supported by the adjusting member, and the pivot shaft moves relative to the pivoting hole to the side away from the clamping knife, and the clamping knife and the cutting knife are separated by a set distance, and the holding of the blank is held. The width of the portion along the moving direction of the cutting knife is larger than the diameter of the blank, and the blank has a certain gap between the entering portion and the receiving portion of the holding blank;

The blank is kept at right angles to the direction of movement of the cutting knife before and after being cut.