JP3415964B2 - Movable cutting blade for restraint shearing machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable cutting blade for a restraining shearing machine. More specifically, the present invention relates to a movable cutting blade used in a restraining shearing machine that cuts a restrained long bar into a fixed size by a shearing force and removes a forging material. [0002] Forging material removal is performed by cutting a long bar into short pieces. Cutting for mass production of a forging material is performed by applying a shearing force to a long bar with a shearing machine to cut the bar into short lengths. It is considered that residual stress generated in the forging material cut in this way causes aging cracking. [0003] Such residual stress is caused by bending (hereinafter referred to as "top bending" in this specification) caused by a bending stress acting on the leading end of a long bar to be cut and moving the long bar backward during cutting. The main cause is the generation of retraction force for retreating (hereinafter, referred to as buckling in this specification). In the case of free cutting, such bending and buckling cannot be avoided. A shearing machine for avoiding such a phenomenon is known as a constraint shearing machine. 2. Description of the Related Art As a restraining shearing machine, a shearing machine is known which presses in the axial direction and presses a distal end surface of a long bar to a stopper to avoid bending. There is also known a shearing machine which has a cylindrical shape and uses a movable-side shear blade for restraining a bar at an inner peripheral cylindrical surface of the cylinder. Furthermore, there is known a shearing machine which is formed in a tubular shape and uses a movable-side shearing blade for restraining a rod on an inner peripheral cylindrical surface of the cylinder. Such cutting machines, known as precision shears and called restraint shears, are indispensable processing machines for the mass production of precision forgings. [0006] The movable shear blade of such a restricted high-speed cutting machine is a single blade having a large volume made of expensive blade steel. For example, 50 sets of such blades are used in one restricted high-speed cutting machine. When the material diameter is represented by D1 to D50 and the inner diameter of the cutting blade is represented by d1 to d50, it is represented by Dn = dn + a, and a is appropriately determined for precision cutting. The manufacturing cost of such tens of sets of knives has reached １ ／ to ３ of the cutting machine body price. In view of such circumstances, a cutting blade whose cost has been reduced is also known.
This cutting blade is a composite in which a small-sized cutting blade portion and this portion are fixed to a mother body by shrink fitting or the like. [0007] As described above, another problem remains that the cost reduction is unsatisfactory even if the cost is reduced by suppressing the rise in the material cost.
The cutter is housed in the cutter case and attached to the cutting machine. At the time of blade replacement, the blade case is placed on a carriage by a crane or the like and reciprocated between the cutting machine and the blade accommodating place. At the blade storage location, replace the blade, which is a complex in the blade case. This replacement requires the operator to perform heavy labor in lifting and lowering the heavy knife complex. Such hard work is preventing cost reductions due to labor costs and other management problems. On the other hand, in recent years where mass productivity of forgings, improvement of processing accuracy, and extension of component life are increasingly required, it is impossible to follow technological progress unless bending is further avoided and restraint performance is improved. In order to perform precise restraint cutting in response to this demand, there is a problem that the unit price of the cutting blade increases. The present invention has been made based on such a technical background, and achieves the following objects. An object of the present invention is to provide a movable cutting blade for a restraining shearing machine for mass-producing a forging material having a long service life and high accuracy by enhancing the restraining performance. [0011] It is an object of the present invention to provide a movable cutting blade for a restraining shearing machine whose unit price does not increase even if the restraining performance is enhanced. An object of the present invention is to provide an inexpensive movable cutting blade for a restraint shearing machine that relieves the operator from heavy labor in blade replacement work. Means for Solving the Problems To solve the above problems, the following means are adopted. The movable cutting blade for a restraining shearing machine according to the present invention includes: an annular blade body (45) formed of an annular blade material in contact with the peripheral surface of the long bar material and surrounding the long bar material; A movable cutting blade for a restraining shearing machine, comprising a non-circular restraining body (49) having a contact surface in contact with a partial circumferential surface on a movable direction side and formed of a non-circular restraining member only on the movable direction side. Blade body (45) and said non-circular constraint body (49)
And the inner surface of the annular blade body (45) is a first cylindrical surface (46) having a cylindrical surface, and the contact surface in contact with the partial peripheral surface of the non-circular constraint body (49) is Second
A cylindrical surface (51), wherein the first cylindrical surface (46) and the second cylindrical surface (51) continuously form the cylindrical surface;
Positioning members (54, 55) for connection are provided on the annular blade body (45) and the non-annular restraining body (49). According to the movable cutting blade for a restraining shearing machine of the present invention, the bar on the movable blade side is precisely restrained by a restraining member. Although the restraint member of the restraint member is not annular, the effective restraint length is long. The restricting member can be replaced independently of the movable blade. Next, an embodiment of the present invention will be described. FIGS. 4, 5, and 6 are cross-sectional views illustrating a movable blade according to a first embodiment of the present invention, and FIGS. 1, 2, and 3 are cross-sectional views illustrating the movable blade. FIG.
8 is a front view and a side view showing a main part of the lever press 1 provided with the restricted cutting die including the fixed blade and the movable blade shown in FIGS. A bed 2 of a lever press 1 having a mechanism to be described later is fixed to an upper surface of a machine base 3 of a machine body 3. Above the bed 2, there is provided a ram 5 which is driven up and down by the body 3 and supported. An upper die 6 which is a push die is attached to the ram 5. A lower mold assembly jig 7 is set on the upper surface of the bed 2. The lower die assembling jig 7 is guided by a jig body 8 fixed to the upper surface of the bed 2, a hard liner 9 fixed to the jig body 8, and a hard liner 9 to be able to change the left and right positions. And a main body 10. The lower die mounting body 10 is provided with a plurality of moving rollers 11 in which the lower end surface of the lower die mounting body 10 coincides with the raceway surface. The lower die mounting main body 10 is gripped and fixed to the jig main body 8 by a plurality of hydraulic clamping means 41. The lower die mounting main body 10, which has been released from the gripping and fixing by the hydraulic clamp means 41, is easily moved back and forth by the moving roller 11, and is removably reloaded on a die exchange / transportation truck described later, as shown in FIG. 8. Is done. As shown in FIGS. 9 and 10, a cylindrical fixed blade fixing holder 12 is fixed to a lower die fixing main body 10 fixed to a jig main body 8. As shown in FIG. A cylindrical hole 13 that is depressed in the axial direction is provided on one end surface side of the fixed blade fixing holder 12. An annular fixed blade 14 is fitted in the cylindrical hole 13 in the axial direction. As shown in FIG. 10, the fixed blade 14 is provided with a central hole 16 having a cylindrical surface 15 centered on the central axis of the cylindrical surface as the outer peripheral surface. The circumference of the outer end of the center hole 16 is formed as a blade edge 17. A center hole 18 that reaches the center hole 16 penetrates through the fixed blade fixing holder 12. An annular body 19 for restraining the fixed side work is inserted into the center hole 18. The peripheral surface of the annular body 19 of the fixed-side work restraining annular body 19 is a cylindrical surface 19a in this embodiment for shearing a rod having a circular cross section. This cylindrical surface and the cylindrical surface 15 of the fixed blade 14 are continuous in the same axial direction. The fixed blade 14 and the fixed-side work restraining annular body 19 are made of a high-hardness steel material for the cutting blade.
9 can use a steel material cheaper than the fixed blade 14.
The work introduction part 20 of the fixed side work restraining annular body 19 is slightly expanded in diameter. As shown in FIG. 1, the fixed side work restraining annular body 19 and the fixed blade fixing holder 12 are divided into a fixed side work restraining annular body 19 and a fixed blade fixing holder 12 as a restrained annular body. A plurality of screw holes 21 are passed in the axial direction. The coupling bolt 22 is screwed into the screw hole 21. The screw hole 21 reaches inside the fixed blade 14. The fixed side work restraining annular body 19, the fixed blade fixing holder 12, and the fixed blade 14 are connected to each other by the connecting bolt 22. Two pin holes 23 are formed in the end face of the fixed blade 14 so as to reach the inside of the fixed blade fixing holder 12 from two places 180 degrees different from each other in the axial direction. A fixed blade side positioning pin 24 is passed through the pin hole 23. A kick-out pin insertion hole 25 sharing a common central axis from the end surface of the fixed blade fixing holder 12 to the end surface of the fixed blade 14 is formed in the axial direction. The ejection pin insertion hole 25 has a large diameter in the fixed blade fixing holder 12 and a small diameter in the fixed blade 14. The ejection pin 26 is inserted into the ejection pin insertion hole 25. Kick pin 26
Is provided with a flange 27 at one end. A compression coil spring 28 is interposed between the flange 27 and the step wall of the kick-out pin insertion hole 25. A perforated stopper 29 is attached to the rear end surface of the fixed blade fixing holder 12 where the rear end of the ejection pin insertion hole 25 is located. The ejection pin 26 is formed by the stopper 29.
Is restricted so that the front end surface does not protrude even slightly from the end surface of the fixed blade 14. A kicking means (not shown) protrudes and retracts in the hole of the stopper 29. As shown in FIG. 10, the lower die mounting body 10
A clamping hole 31 penetrating the fixed-side work restraining annular body 19 in the radial direction from the zenith part 30 is formed.
Clamping pin 3 that slides into clamping hole 31
Two are fitted. Clamping pin 32 is coupled to a drive (not shown) of pneumatic clamper 34 fixed to the top surface of zenith 30. As shown in FIGS. 10 and 11, the movable blade guide 40 constitutes a part of the lower die attaching main body 10. As shown in FIG. A guide liner 42 is provided on the movable blade guide 40. The movable blade holder 43 is guided by the guide liner 42 and moves up and down. As shown in FIGS. 4, 5, and 6, a columnar hole 44 is formed in the movable blade holder 43 from the fixed blade 14 side. An annular movable blade 45 is fitted in the cylindrical hole 44. The movable blade 45 is provided with a center hole 47 having a cylindrical surface 46 centered on the central axis of the cylindrical surface that is the outer peripheral surface. The circumference of the outer end of the center hole 47 is formed as a blade edge 48. As shown in FIG. 5, the movable blade 45 is provided with a partial annular restraining member 49 projecting in the work feeding direction. The movable blade 45 and the partial annular restraining body 49 are separable. As shown in FIG. 12, which is a cross section taken along line XII-XII in FIG. 5, the partial annular restraining body 49 forms a partial ring 50, and the inner surface is a portion of a portion of the blade edge 48 of the fixed blade 14 extending in the axial direction. It is a cylindrical surface 51. A plurality of screw holes 52 continuous with the movable blade 45 and the partial annular restraining body 49 are formed. In the screw hole 52,
The connecting bolt 53 is screwed. A plurality of pin holes 54 continuous with the movable blade 45 and the partial annular restraining body 49 are formed. A movable blade side positioning pin 55 is fitted into the pin hole 54. The angle range in which the partial ring 50 is provided is free, but it is always the direction of movement of the movable blade 45 (indicated by an arrow D in FIG. 12) and the direction from the initial position of the movable blade described later toward the cutting completion position. As shown in FIG. 12, a partial annular restraining body 49 is provided in a range of 120 degrees to 180 degrees around the center line O of the movable blade 45. It is preferable that the center of the partial annular restraining body 49 coincides with the arrow D. As shown in FIG. 8, a bogie 60 that moves forward and backward with respect to the lever press 1 is guided on the track in front of the lever press 1 (front side, right side in the figure). Trolley 6
A guide table 62 is attached to an upper surface of a column 61 supported by the guide table 62. The upper surface of the guide table 62 and the upper surfaces of the jig body 8 and the hard liner 9 form one plane. The exchange lower jig 7 is mounted on the carriage 60. The diameter of the cylindrical surface 15 of the fixed blade 14 of the replacement lower die assembling jig 7 and the diameter of the inner peripheral surface of the annular body 19 of the fixed side work restraining annular body 19 are determined by the fixed blade of the lower die assembling jig 7 during operation. In some cases, the diameter of the cylindrical surface 15 and the diameter of the annular inner peripheral surface of the fixed-side work restricting annular body 19 may be different. The diameter of the cylindrical surface 15 of the fixed blade 14 of the replacement lower die assembly jig 7 and the diameter of the inner peripheral surface of the annular body 19 of the fixed side work restraining annular body 19 are the cylinders of the fixed blade 14 of the lower die assembly jig 7 during operation. The diameter may be the same as the diameter of the peripheral surface of the annular body of the surface 15 and the annular body 19 for restraining the fixed work. Similarly, the diameter of the cylindrical surface 46 of the movable blade 45 of the replacement movable blade 45 and the diameter of the partial cylindrical surface 51 of the partial annular restraining body 49 are the cylindrical surfaces of the movable blade 45 of the lower die assembly jig 7 during operation. In some cases, the diameter may be different from the diameter of the partial cylindrical surface 51 of the 46 and the partial annular restraint 49. Movable blade 4 of replacement lower die assembly jig 7
5 and the partial cylindrical surface 5 of the partial annular restraining body 49
The diameter of the partial cylindrical surface 51 of the movable blade 45 of the lower die assembly jig 7 and the partial cylindrical surface 51 of the
May be the same as the diameter of FIGS. 13 and 14 show a stopper device 70 provided so as to face the workpiece feeding direction. The stopper device 70 is mounted on a stopper table 71 provided alongside the lever press 1. As shown in FIG. 13, a fixed-size feed motor 72 for determining a feed amount of a work as a bar is provided on the upper surface of a part of the stopper base 71. The sizing pulse counter 73 counts the rotation angle of the rotating body associated with the reduction gear connected to the rotation shaft of the sizing feed motor 72. A gear 75 is coaxially mounted on the output rotary shaft of the fixed-size pulse counter 73. As shown in FIG. 13, the rotation of the gear 76 meshing with the gear 75 causes the stopper pressing screw 77 to move forward by a fixed distance. The stopper block 78 is pressed in the forward direction by the stopper pressing screw 77. A stopper 80 is axially supported by the stopper block 78. A plurality of hydraulic clampers 79 are provided on the stopper base 71 at a plurality of locations. The stopper 80 is firmly fixed by the hydraulic clamper 79 while being pressed by the stopper push screw 77 by the hydraulic clamper 79. A stopper head 81 is attached to the front end of the stopper 80. A part of the front end face of the stopper head 81 is
Opposing the center hole 16. FIG. 15 shows a known lever press for a restrained cutting machine. In brief, the lever press is configured such that a crank 93 provided eccentrically to a large gear 92 that rotates by meshing with a flywheel 91 driven by a drive motor 90 as a rotational drive source, and a king pin 95 centered on a square metal 94. A ram that slides up and down on the output end 97 of the swinging lever 96 is provided. The power when the ram 5 descends is given to the movable blade 45. Next, the operation of the embodiment will be described. The carriage 60 shown in FIG. 8 is advanced with respect to the lever press 1 shown in FIG. 15 suitable for the cutting machine. The lower die mounting main body 10 that travels lightly by the rollers 11 is pushed by the handle 99 and transferred to the jig main body 8 on the bed 2. The lower mold mounting body 10 is clamped at a fixed position by the hydraulic clamper 41. As shown in FIG. 7, the lower die attaching main body 10 can be moved laterally while being guided by the hard liner 9. It can be clamped even at the moving position. The two lower mold mounting bodies 10 are placed on the jig body 8 and can be used interchangeably. FIG. 10 shows a clamp state in which the lower mold assembling jig 7 is clamped to the jig main body 8 on the bed 2. The lever press 1 is driven. During one rotation cycle of the large gear 92 of the lever press 1, the following one-step operation is performed. FIG. 10 shows a state before the movable blade 45 operates. That is, as shown in FIG. 16, the fixed blade 14 and the movable blade 45 are coaxial, and the cylindrical surface 46 of the central hole 47 of the movable blade 45 and the cylindrical surface of the central hole 16 of the fixed blade 14 15 form the same cylindrical surface. The same cylindrical surface and the inner peripheral surface of the fixed-side work restricting annular body 19 also form the same cylindrical surface. In the state before such an operation, the bar W is supplied by the pinch roller 100 as shown in FIG. The bar W, which is moved straight by the pinch roller 100, passes through the central holes of the fixed-side work restraining annular body 19, the fixed blade 14, and the movable blade 45, hits the stopper head 81 of the stopper 80, and stops. The bar W is pressed in the forward direction by the pinch roller 100, but the stopper 80 clamped by the hydraulic clamper 79 does not retreat. The front end face of the bar is pressed against the front end face of the stopper head 81. One rotation of the large gear 92 of the lever press 1 is started. The lever 96 swings and the output end 97 descends.
By the lever action of the lever 96, the upper die 6 attached to the ram 5 starts pushing down the movable blade holder 43 at a position where the force in the descending direction of the output end 97 starts to be maximum. The portion of the bar W located in front of the fixed blade 14 is tomized with respect to the portion inside the fixed blade 14. In this tomographic state, as shown in FIG. 21, the main body Wa is a cylindrical surface 15 which is an inner peripheral surface of the fixed blade 14.
And it is constrained by the annular inner peripheral surface of the fixed-side work constraining annular body 19. Due to this restriction, no bending force acts on the main body Wa. The fault section Wb is restrained by the cylindrical surface 46 of the movable blade 45 and the partial cylindrical surface 51 of the partial annular restraining body 49. Due to this restriction, no bending force acts on the tomographic portion Wb.
Further, the front end surface of the tomographic portion Wb is restrained by the stopper head 81. The stopper head 81 resists the bending force. The shearing force acting between the main body Wa and the fault Wb acts on the main body Wa and the fault Wb as bending stress. When this bending stress is largely concentrated on the surface, aging cracking is caused at a later date. The main body Wa is also restrained by the fixed-side work restraining annular body 19 and is less likely to receive concentrated bending stress. The fault section Wb is also restrained by the partial cylindrical surface 51 of the partial annular restraining body 49 which is an extension, and is less likely to receive concentrated bending stress. During the shearing, a forward force acts on the bar W, but the forward force is restrained by the stopper 80. FIGS. 17 and 19 show a cut-off completed state. The movable blade 45 is at the bottom dead center together with the ram 5. The billet cut by the ejection pin 26 is ejected. FIG. 20 shows that the billet falls, the stopper 80 retreats, the ram 5 returns to the top dead center, and the push-up rod 102 shown in FIG.
The bar W is moved up to the ascending position by the
Indicates a state in which a predetermined amount has been sent out. Next, the stopper 80 moves forward and pushes back the front end of the bar W to make the bar protrusion amount constant. Such restraint cutting is performed at a high speed, and the edges of the fixed blade 14 and the movable blade 45 are damaged, and wear is advanced as a whole.
Further, wear of the inner peripheral surface of the fixed-side work restraining annular body 19 and the front end of the partial cylindrical surface 51 of the partial annular restraining body 49 progresses. Replace it with the main unit 10 for mounting the lower die in standby. The fixed blade 14, the fixed-side work restraining annular body 19, the movable blade 45, and the partial annular restraining body 49 of the replaced lower die attaching main body 10 are replaced. The fixed blade 14 and the fixed-side work restraining annular body 1
9 can be exchanged independently. Movable blade 45 and partial annular restraint 4
9 can be exchanged independently. When the connecting bolt 22 is removed, the fixed blade 14 and the fixed-side work restraining annular body 19 are separated. Both or one of the fixed blade 14 and the fixed-side work restraining annular body 19 is replaced. The fixed blade 14 after the rearrangement by the pin hole 23
The positioning of the fixed-side work restraining annular body 19 is performed. If the connecting bolt 53 is removed, the movable blade 45 and the partial annular restraining body 49 are separated. The movable blade 45 and / or one or both of the partial annular restraints 49 are replaced. The pin 55 allows the movable blade 45 after the reassembly and the partial annular restraining body 49 to be aligned. According to the movable cutting blade for a restraining shearing machine of the present invention, the bar on the movable blade side is precisely restrained by the restraining member. The effective constraint length is long. Since the restraining member can be replaced independently of the movable blade, the total cost can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front sectional view showing an embodiment of a fixed-side cutting blade for a restraining shearing machine. FIG. 2 is a left side view of FIG. 1; FIG. 3 is a right side view of FIG. 1; FIG. 4 is a front view showing Embodiment 1 of a movable cutting blade of the restraint shearing machine according to the present invention. FIG. 5 is a right side view of FIG. 4; FIG. 6 is a bottom view of FIG. 5; FIG. 7 is a front view showing a restraint shearing machine according to the present invention. FIG. 8 is a left side view of FIG. 7; FIG. 9 is a left side view showing a jig including a fixed-side cutting blade. FIG. 10 is a front sectional view of FIG. 9; FIG. 11 is a right side view of FIG. 10; FIG. 12 is a front sectional view of a part of FIG. 5; FIG. 13 is a plan view showing a stopper. FIG. 14 is a front view of FIG. 13; FIG. 15 is a front view showing a known lever press. FIG. 16 is a cross-sectional view showing a cutting mode. FIG. 17 is a cross-sectional view showing another cutting mode. FIG. 18 is a cross-sectional view showing a first cutting step. FIG. 19 is a sectional view showing a second cutting step. FIG. 20 is a sectional view showing a third cutting step. FIG. 21 is a cross-sectional view showing the cutting action of both blades during cutting. [Description of Signs] 45 movable blade 46 cylindrical surface (first) 49 non-circular restraining body 51 cylindrical surface (second) 55 pin (positioning member)

Claims (1)

(1) An annular blade body (45) formed of an annular blade material in contact with the peripheral surface of the long bar material and surrounding the long bar material, and the long bar material A movable-side cutting blade for a restraining shearing machine, comprising: a non-circular restraining body (49) formed of a non-circular restraining member only on the movable direction side and having a contact surface in contact with a partial circumferential surface on the movable direction side of An annular blade body (45) and the non-circular constraint body (49) are separable; an inner surface of the annular blade body (45) is a first cylindrical surface (46) having a cylindrical surface; The contact surface in contact with the partial peripheral surface of the body (49) is a second cylindrical surface (51), and the first cylindrical surface (46) and the second cylindrical surface (51) are continuously formed by the cylindrical surface. A positioning member (54, 55) for forming and connecting the annular blade body (45) and the non-circular constraint body (49) And a movable cutting blade for a restraining shearing machine.