JP2011177878A - Cutting method of metal rod material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting method for cutting a long rod material so as to obtain materials for many components. <P>SOLUTION: Two holey blades having the same outer shape as a rod material to be cut are arranged in overlap so that the rod material is inserted through them, and a fixing blade 1 is fixed to a fixing shaft 3. A revolution blade 2 is held by a bearing 4 fitted to an eccentric shaft 5. When a rotation body 10 (flywheel) is rotated by the rotation of a motor, the eccentric shaft 5 and the bearing 4 are rotated by guide shafts 9 through a geared wheel 7 and a spiral gear 5a of the eccentric shaft 5, and the revolution blade 2 is freely moved and rotated. When the geared wheel 7 is axially pushed in by an operation wheel 8, the eccentric shaft 5 is guided by the engagement of the spiral gear 5a and the geared wheel 7, and is rotationally moved together with the bearing 4 and the revolution blade 2. When the revolution blade 2 is rotationally moved, the center of hole of the revolution blade 2 is away from a rotational center line P, and is freely moved and revolved by the bearing 4. The revolution blade 2 cuts in the material while being revolved in the outer circumference of the rod material inserted through the blade holes, and shears and cuts the rod material when a revolution radius becomes large. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  A method in which long metal bars that are vertically fed by a predetermined length are successively cut from a front end to a predetermined length.

  An automatic lathe is used as a means to obtain a large number of parts by cutting long metal bars (hereinafter referred to as "bars") that are fed vertically by a predetermined length from the front end to a predetermined length. Cutting and cutting, cutting with a saw, or inserting a bar between two opposing blades perpendicular to the blade, with a strong force so that one blade passes the other In general, a method of cutting and shearing is used.

JP2003-231016

  The method of cutting with an automatic lathe or cutting with a saw produces unnecessary chips and takes time to cut, which is not suitable for mass production.

  For mass production, there is a method of cutting at a high speed by attaching the two opposed blades to a press machine or a shearing machine. In this method, the blade is struck and cut, so that the outer shape of the bar is deformed, and the shear surface is cut obliquely or burrs appear. In order to make this a high-quality component material, it is necessary to perform secondary processing such as forging to correct deformation and slanting cuts, and to remove burrs by scratching or chamfering. The manufacturing cost of Furthermore, when the blade is struck against the bar, a loud impact sound is generated, which deteriorates the factory environment.

  However, if special steel used for the ball or roller of a bearing, a chain joint pin, or the like is cut using the method of Patent Document 1, the cutting edge of the notch forming member is quickly blunted and cannot withstand long-term use. Further, the mechanism for increasing / decreasing the eccentric amount of the eccentric rotation is complicated, a clamp for fixing the rotation of the bar is necessary, the apparatus becomes expensive, and the square bar cannot be cut.

  Therefore, in order to obtain a good part material by cutting a long bar material short, the present invention does not deform the outer shape of the bar material, the cut surface is not slanted, no burr is produced, and it is quiet. An object is to provide a simple structure cutting method that can cut at high speed.

  In order to achieve the above-mentioned object, the cutting method of the present invention has two blades, and the blades have holes of the same shape as the vertically fed rods, with a size through which the rods pass. Become a blade. The two blades are arranged so that the holes of the blades are aligned, and one blade is fixed. The other blade is held by a mechanism that can revolve so that the blades pass each other around the center of the hole of the fixed blade, and the mechanism is gradually changed from 0 to a radius that can cut the material.

  If the revolving blade revolves with the revolving blade gradually increasing from 0 to the revolving blade, the revolving blade hole pushes and cuts the outer periphery of the rebar and revolves around the bar. Is laterally displaced and pushed by the hole of the fixed blade with a rotational phase difference of 180 degrees from the revolving blade, and the lateral displacement direction of the bar rotates with the revolving blade. Furthermore, if the revolving blade is pushed all the way, the bar material is sheared and can be cut. In addition, the force that the revolving blade pushes off gives rotation to the bar, but the bar does not rotate because the pushing of the fixed blade receives the same force.

  When the blade pushes while rotating around the outer periphery of the bar, there is no partial deformation of the bar surface, and there is no oblique cut of the shear surface. In addition, since it shears while being squeezed, it becomes a smooth cut surface, and it becomes a material of a good quality part as it is.

  In the conventional method of cutting with two opposed blades, an outward burr appears at the edge of the cut surface where the blade hits the bar, and the edge of the cut surface where the opposite blade does not hit Droops. In the method of the present invention, the portion where the blade hits and the portion where the opposite blade does not touch rotate alternately on the outer periphery of the bar, so there is no burr and there is little drooping and it becomes a material of high quality parts as it is. .

  The movement of the blade is mainly rotational, so it is easy to increase the speed.

  Since the blade is not struck against the bar, there is no impact sound, which helps to improve the factory environment.

FIG. 1 is a cross-sectional view taken along the line AA of the schematic view showing the cutting method of the present invention. FIG. 2 is a schematic front view showing the cutting method of the present invention. FIG. 3 is a cross-sectional view of the cutting mechanism portion BB showing the embodiment of the present invention. FIG. 4 is a front view of the cutting mechanism portion showing the embodiment of the present invention. FIG. 5 is a cross-sectional view of the entire cutting machine C-C showing the embodiment of the present invention. FIG. 6 is a front view of the whole cutting machine showing the embodiment of the present invention. FIG. 7 is a cross-sectional view of another cutting mechanism portion DD showing the embodiment of the present invention. FIG. 8 is a front view of another cutting mechanism unit representing the embodiment of the present invention.

  First, the cutting method of the present invention will be described with reference to FIGS.

  The fixed blade 1 has a hole of the same shape as the bar that is fed vertically and has a size through which the bar can pass, the outer periphery is driven into the hole at the tip of the fixed shaft 3, and the center of the hole of the fixed blade 1 is the center of rotation. Along with the line P, a gap suitable for cutting is formed between the revolving blade 2 and fixed. There is a through hole in the center of the fixed shaft 3 through which the bar can easily pass, and the bar to be cut is fed from the rear of the hole, passes through the hole of the fixed blade 1 at the front, and the hole of the revolving blade 2 (biased). Enter when you don't mind.

  The revolving blade 2 has a hole of the same shape as that of the vertically fed bar, and the size through which the bar passes, and when it is not eccentric, the center of the hole is aligned with the rotation center line P and is held by the bearing 4 to be idle. And can be rotated.

  The eccentric shaft 5 holds the bearing 4 by a stepped hole having the rotation center line P as the center, the bottom hole becomes a through hole smaller than the outer ring of the bearing 4, and the cut bar is taken out from this hole. Further, the outer periphery of the eccentric shaft 5 becomes an eccentric circle having the eccentric line Q as the center, and is held by the bearing 6 having the eccentric line Q as the center, and another part of the outer periphery becomes a flange and hits the side surface of the inner ring of the bearing 6. . Further, another portion of the outer periphery becomes a twisted tooth 5a, and meshes with and meshes with a twisted internal tooth centered on the eccentric line Q of the toothed ring 7. C represents the tooth profile of the twisted tooth 5a.

  The toothed wheel 7 is guided by a plurality of guide shafts 9 fixed integrally, and can move in the axial direction while rotating together with the rotating body 10. Furthermore, the operation wheel 8 fixed integrally with the toothed wheel 7 has a flange for receiving an operation of moving in the bearing direction or stationary while rotating. The operation method of the operation wheel 8 will be described with reference to FIGS.

  The rotating body 10 is held by two bearings 11 and 12 which are fitted to the outer periphery of the fixed shaft 3 and fixed in the axial direction, and the V pulley 10a integrated with the rotating body 10 controls the rotation of the motor V. Receiving with a belt, it rotates at high speed. The rotating body 10 also serves as a spring wheel for cutting the bar at high speed. The bearing 6 is held at the outer periphery of a stepped hole on the opposite surface of the rotating body 10 from the V pulley 10a, and receives an axial load at the step. Further, the rotating body 10 has a plurality of through holes arranged circumferentially on a plane outside the bearing 6 and is slidably fitted to the plurality of guide shafts 9.

  When the bar is fed while the rotating body 10 is rotating at a high speed, the operation wheel 8 is operated so that the center of the hole of the revolving blade 2 is aligned with the rotation center line P, and is stopped in the axial direction. At this time, the revolving blade 2 does not revolve, but tries to rotate by the frictional resistance of the bearing 4.

  When cutting the bar, the rotating body 10 rotating at high speed rotates together with the toothed wheel 7 through the guide shaft 9, and further rotates the eccentric shaft 5 through the meshing of the twisted teeth 5a. Let Next, when the operating wheel 8 is operated and the toothed wheel 7 is pushed in the axial direction, the eccentric shaft 5 is guided by the twisted tooth 5a to rotate around the eccentric line Q, and the hole of the revolving blade 2 is The center begins to rotate eccentrically away from the rotation center line P, (θ represents the rotational movement angle, S represents the position of the hole of the revolving blade 2 that has rotated the angle, and the hole of the revolving blade 2 is a bar. If it hits the material, it will rotate eccentrically without being able to rotate eccentrically, it will push around the bar while gradually increasing the revolution radius, the fixed blade 1 will push through the bar with a rotation phase difference of 180 degrees, If the revolution radius increases, the bar is sheared and cut. At this time, the bar is going to rotate by cutting the revolving blade 2, but the rotation of the bar is stopped by cutting the fixed blade 1.

  When the toothed ring 7 rotates together with the eccentric shaft 5 through the meshing of the twisted tooth 5a, the toothed ring 7 moves in the axial direction and rotates the eccentric shaft 5 by the guide of the twisted tooth 5a. Sometimes an axial component is generated in the twisted tooth. In order to receive the component force, the flange on the outer periphery of the eccentric shaft 5 is applied to the inner ring of the bearing 6, and the toothed ring 7 is restrained in the bearing direction by the operation wheel 8 so that it cannot move freely. A method of restraining the operation wheel 8 in the axial direction will be described with reference to FIGS.

When the round bar is cut, the revolving blade 2 is allowed to move freely, so that the friction between the hole of the revolving blade 2 and the surface of the round bar is reduced, and there is an effect of suppressing heat generation. Also, when cutting the square bar material, if the revolving blade 2 moves freely and the direction of the hole changes, the tip of the bar material cannot pass through, so the blade holders 1a and 2a shown in FIG. A pin is driven in (not shown in FIG. 3), and the protruding portion slides into a groove (a groove that can move linearly by the amount of eccentricity) on the other facing surface to stop the free movement.

When cutting bars, a large force is usually required in units of tons. Therefore, it will be described below whether the mechanism of the present invention can be realized withstanding the force.

  When a large number of cut surfaces of a metal round bar cut by a method of shearing with two opposing blades as described above are observed, the incision size of the portion pushed by the blade is 10 to 15 percent of the diameter of the round bar, and the rest is cut. The face is sheared. When applied to the cutting method of the present invention, in order to cut 10 to 15 percent with the eccentric amount of the eccentric line Q being the same as the radius of the round bar, the rotational movement angle θ is approximately 12 in the drawing on the CAD drawing. It may be set to 17 degrees. That is, the twist of the twisted tooth 5a of the eccentric shaft 5 becomes extremely gentle. Of course, since the cutting method is different, the method of the present invention should be able to cut with a smaller cutting amount.

  When cutting, the force applied to the revolving blade 2 is received by the twisted teeth 5a with the eccentric line Q as a fulcrum. If the amount of eccentricity of the eccentric line Q is the radius of the bar, the radius of the twisted tooth 5a centered on the eccentric line Q is much larger than that of the bar. It becomes small with the inverse ratio of. On the other hand, since the twisted tooth 5a has a large number of teeth as represented by the tooth profile C, it has sufficient mechanical strength.

  As described above, the rotational moment of the twisted tooth 5a is small, and the twist of the twisted tooth 5a is very gentle, so that the force for pushing the toothed ring 7 in the axial direction is further reduced. Therefore, the drive mechanism for operating the operation wheel 8 can be reduced in size.

  The plurality of guide shafts 9 that transmit the rotation of the rotating body 10 to the toothed wheel 7 must be able to withstand the force in the rotational direction when the revolving blade 2 cuts the bar. The radius of the center circle of the guide shaft 9 is much larger than the eccentric radius of the eccentric line Q, and the rotational moment received by the guide shaft 9 is reduced by the inverse ratio of these radii, so that it can withstand. Furthermore, the number of guide shafts can be increased.

When cutting the bar, a large load is applied to the fixed blade 1 and the revolving blade 2 in the radial direction with a rotational phase difference of 180 degrees. This load is received by the bearing 12 via the fixed shaft 3 with respect to the fixed blade 1. . The revolving blade 2 is transmitted to the eccentric shaft 5 via the bearing 4, to the bearing 6, and to the rotating body 10 and received by the bearing 12. That is, the load when cutting the bar is offset. Therefore, the structure of the holding portion of the fixed shaft 3 is simplified. As described above, the mechanism of the present invention can be realized.

  Next, an embodiment of the present invention will be described with reference to FIGS.

  The fixed blade 1 has a hole of the same shape as the vertically fed bar material and has a size through which the bar material passes, and the outer periphery is driven into a stepped hole of the holder 1a. Further, the bottom hole of the holder 1 a penetrates with a size that allows the bar to easily pass through, and the outer periphery is fitted into the hole at the tip of the fixed shaft 3. Thereby, the center of the hole of the fixed blade 1 is aligned with the rotation center line P. For the material of the fixed blade 1, cemented carbide, alloy tool steel, high speed tool steel or the like is used.

  The fixed shaft 3 has a through-hole having a size through which the bar can easily pass through the shaft center, and a bar cut from the rear of the through-hole is sent to pass through the hole of the front fixed blade 1 to revolve the blade. Pass through 2 holes (when not eccentric). Further, the bearing 12 is fitted to the outer periphery near the tip of the fixed shaft 3 to receive a large radial load at the time of cutting. For this purpose, a cylindrical roller bearing is used as the bearing 12. Further, the portion of the shaft behind the bearing 12 becomes a hook, the bearing 12 is stopped from moving backward with the hook, and two bearings 11 are fitted to the shaft behind the hook, and the bearing 11 Keeps the space across the central hole partition 10b of the rotator 10. Further, the collar 13 is fitted to the shaft at the rear of the bearing 11 to open a gap between the rotating body 10 and the mounting leg 14. The shaft passes through the hole of the mounting leg 14, and a nut 15 is fastened to the screw at the rear end of the shaft to fix the shaft to the mounting leg 14 so that the axis of the shaft is aligned with the rotation center line P. The rotary body 10 is fixed in the axial direction by sandwiching the partition 10b of the center hole 10 between the bearings 11. Further, an appropriate pressure is applied to the bearing 11 by tightening the nut 15.

  The mounting leg 14 lifts and fixes the fixed shaft 3 from the base plate so that the rotating body 10 can rotate without touching the base plate. Below the mounting leg 14, there is a leg that protrudes symmetrically (with respect to the rotation center line P) to the outside of the support member of the fixed shaft 3, and the lower surface is a flat part, and is arranged symmetrically on the plane of the leg part. There are multiple mounting holes, and bolts are attached to the base plate through the holes.

  The revolving blade 2 has a hole of the same shape as that of the vertically fed bar, and has a size through which the bar passes, and is driven into the stepped hole of the holder 2a so that it rotates when the center of the hole is not eccentric. It matches the center line P. For the material of the revolution blade 2, cemented carbide, alloy tool steel, high-speed tool steel or the like is used. The bottom hole of the holder 2a is a through hole having a size that allows the cut bar to be easily taken out, leaving a step for receiving the revolving blade 2. The outer periphery of the holder 2a is fitted to the inner ring of the bearing 4, and further, the end portion of the outer periphery becomes a flange, one surface of the flange is applied to the inner ring of the bearing 4, and the opposite surface of the flange is the stepped hole of the eccentric shaft 5. In this way, the movement of the holder 2a in the axial direction is minimized, leaving a gap that can be freely rotated. Even so, since the width of the bearing varies, the shim ring must be sandwiched between one side of the flange and the inner ring of the bearing 4 for adjustment. The outer ring of the bearing 4 is fitted in the stepped hole of the eccentric shaft 5 and receives a large radial load at the time of cutting. For this purpose, a cylindrical roller bearing is used as the bearing 4.

  The bottom hole of the stepped hole of the eccentric shaft 5 leaves a step for receiving the flange of the holder 2a, and penetrates while gradually expanding the hole diameter. The reason for expanding the hole is to slide the cut bar and discharge it to the outside. It is. Further, the outer periphery of the eccentric shaft 5 becomes an eccentric circle having the eccentric line Q as the center, and is held by the bearing 6 having the eccentric line Q as the center. Another portion of the outer periphery becomes a flange and hits the side surface of the inner ring of the bearing 6. Further, another portion of the outer periphery becomes a twisted tooth 5a, and meshes with and meshes with a twisted internal tooth centered on the eccentric line Q of the toothed ring 7.

  The toothed wheel 7 has a circular outer periphery centered on the rotation center line P. The outer peripheral part is a flange, and there are a plurality of holes arranged on the circumference in the plane of the outer side of the flange, and the shaft on one end of the guide shaft 9 is inserted into the hole, and the nut is tightened with the screw at the end to be integrated Secure to. Thus, the toothed wheel 7 is guided by the plurality of guide shafts 9 and can move in the axial direction together with the rotating body 10.

  The operation wheel 8 is integrally fixed to the toothed wheel 7 and has a flange for receiving an operation of moving or stopping in the bearing direction while rotating. The operation method of the operation wheel 8 will be described with reference to FIGS. Further, when the bar is cut, the inner circumference of the operation wheel 8 is covered with the twisted teeth 5a of the eccentric shaft 5, so that the cut bar does not remain on the inner circumference.

  The eccentric ring 16 holds the outer ring of the bearing 6 by a stepped hole having an eccentric point Q as the center, receives the side surface of the outer ring of the bearing 6 by the step, and the bottom hole leaves a step for receiving the outer ring of the bearing 6. To penetrate. Further, the non-eccentric outer periphery having the rotation center line P as the center is fitted in the hole on the front surface of the rotating body 10.

  The rotating body 10 has a plurality of push screws 17 that pass through the bottom of the hole in the front and can be turned from the rear, and a plurality of pull screws 18 that pass through the bottom of the hole in the front and can be tightened from the rear. Are arranged alternately on the same circumference. Accordingly, the push screw 17 pushes the eccentric ring 16 and the pull screw 18 fastens the eccentric ring 16 to the rotating body 10, and revolves through the bearing 6, the eccentric shaft 5, the bearing 4, and the holder 2a. The blade 2 is moved in the axial direction, and the gap with the fixed blade 1 is adjusted and fixed.

  The rotating body 10 is held by two bearings 11 fitted in the center hole and the bearing 12, and the V pulley 10a integrated with the rotating body 10 receives the rotation of the motor by the V belt and rotates at a high speed. To do. The rotating body 10 also serves as a spring wheel for cutting the bar. The rotating body 10 has a plurality of through holes arranged on the circumference of a plane outside the eccentric ring 16, and a plurality of guide shafts 9 are slidably fitted through a plurality of linear bushings 19 press-fitted into the holes. Match.

  Reference numeral 20 denotes a retaining ring, the inner circumference is sized to overlap the outer ring of the bearing 4, the outer circumference is sized to overlap the inner ring of the bearing 6, and is tightened with a bolt to the end surface of the eccentric shaft 5 with the seal 21 interposed therebetween. . Thereby, the outer ring of the bearing 4 and the inner ring of the bearing 6 are pressed and fixed via the seal 21. Since the bearing 6 is in the eccentric position, the outer periphery of the retaining ring 20 is also eccentric by the same amount. The seal 21 has the same eccentric outer periphery as the retaining ring 20, and the inner periphery is sized to overlap the inner ring of the bearing 4 to block the release portion of the bearing 4 and prevent entry of dust and the like. However, a thin metal spring material is used as the material of the seal 21 so as not to prevent the rotation of the bearing 4.

  Reference numeral 22 denotes a retaining ring whose inner circumference is sized to overlap the outer ring of the bearing 12 and is fastened with a bolt to the bottom of the hole on the front surface of the rotating body 10 with the seal 23 interposed therebetween. Thereby, the outer ring of the bearing 12 is pressed and fixed via the seal 23. Further, the inner periphery of the seal 23 has a size that overlaps with the inner ring of the bearing 12 to block the release portion of the bearing 12 and prevent entry of dust and the like. However, a thin metal spring material is used for the material of the seal 23 so as not to prevent the rotation of the bearing 12.

  Reference numeral 24 denotes a retaining ring whose inner circumference is sized to overlap the outer ring of the bearing 6, and is fastened to the front surface of the eccentric ring 16 with a bolt 25 to press and fix the outer ring of the bearing 6.

  When inspecting the cutting part or replacing the blade, the retaining bolt 24 of the retaining ring 24 is removed, leaving the fixing member, the rotating body 10 and the eccentric ring 16, and the other rotating members are pulled out and removed. Details thereof will be described with reference to FIGS.

  Further, an embodiment of the present invention will be described with reference to FIGS.

In the method of operating the operation wheel 8 fixed integrally with the toothed wheel 7, both the planes of the flange of the operation wheel 8 are sandwiched between two cam followers 26, and the flange can be rotated but restrained in the axial direction. The two cam followers 26 are attached to the holder 27 to make a pair. In addition, the holder 27 is fitted into a shaft in which the tip of the operation shaft 28 has been lowered into an axial hole that is distant from the cam follower 26, and a nut 29 is fastened and fixed to a screw at the tip of the shaft. Further, in order to fix the holder 27 in the circumferential direction of the operation shaft 28, the knock pin 30 is driven through the stepped shaft of the holder 27 and the operation shaft 28. The cam followers 26 are arranged in two pairs with the operation shaft 28 so as to face each other on the horizontal normal line of the flange.

  The two operation shafts 28 extend rearward, pass through the linear bush 31 and the two linear bushes 32, and further pass through axial holes at both ends of the rear connection tool 33. At both ends of the connector 33, there is a through hole that passes through the center of the axial hole vertically, and the operation shaft 28 has a through hole that passes vertically at the same position as the hole of the connector 33. Is inserted into the through hole, the operating shaft 28 and the connecting tool 33 move together in the axial direction. Further, at the position of the rotation center line P of the connector 33, there is a link ball 35 (a screw having a spherical surface at the tip and a spherical holder in which the outer ring is a screw), and the screw of the outer ring of the spherical holder is fastened to the connector 33. Screw with a spherical surface protruding backwards.

  The operation wheel 8 is connected to the screw protruding to the rear of the link ball 35 by the tip of a drive mechanism such as a hydraulic cylinder, and is operated by the cam follower 26 via the connection tool 33, the connection shaft 28, and the holding tool 27. . Further, the link ball 35 is provided so as to move smoothly even if the movement of the drive mechanism is slightly inclined in the axial direction. When the bar is not cut by the drive mechanism, the coupling tool 33 is stopped in the axial direction so that the center of the hole of the revolving blade 2 matches the rotation center line P, and when the bar is cut, the bar is connected. Push the tool 33 strongly in the axial direction.

  The two linear bushings 32 are fitted in opposition to the axial holes of the holder 36, and are fixed to the holder 36 through bolts in the holes of the flanges of the linear bush 32. The holding tool 36 is fixed to the support base 37 by passing bolts through a plurality of holes arranged inside the linear bushing 32. The support base 37 aligns the axis of the operation shaft 28 with the height of the rotation center line P, and protrudes symmetrically (with respect to the rotation center line P) outward from the support member. There are a plurality of attachment holes arranged on the object in the plane of the leg and are attached to the base plate 38 through bolts.

  As described above, when inspecting the cutting part or replacing the blade, the retaining bolt 24 of the retaining ring 24 is removed, the fixing member, the rotating body 10 and the eccentric ring 16 are left, and the other rotating members are pulled forward. Remove. At that time, the rotating member slips from the cam follower 26 and falls downward. When it becomes a large cutting machine, it is difficult to catch it by hand, so the auxiliary member described below is used.

  The auxiliary member is formed by sliding a linear bush 31 on two operation shafts 28, and the linear bush 31 is fitted in axial holes at both ends of the holder 39 and fixed with a retaining ring for a shaft. Furthermore, the tip is a cone that can be fitted into the taper hole at the center of the eccentric shaft 5, the shaft that protrudes and supports the cone portion, and projects symmetrically (relative to the central axis) to the outside of the shaft. There is a conical shaft 42 with a leg portion having a single body. The conical shaft 42 is fixed to the side surface of the holder 39 through a bolt in a leg hole, and the central axis of the conical shaft 42 is fixed in accordance with the rotation center line P.

  Usually, the holding tool 39 is inserted through the pin 41 into a clasp 40 integrally fixed to the holding tool 36, and further inserted into the holding tool 39 and fixed in the axial direction. Even if the holder 39 is fixed, the operation shaft 28 is slidably engaged with the linear bush 31, so that there is no problem in movement.

  When removing the other rotating member, the pin 41 that fixes the holder 39 in the axial direction is first removed, and the holder 39 and the conical shaft 42 are moved forward by the guide of the operation shaft 28. Extruding and fitting the conical shaft 42 into the tapered hole of the eccentric shaft 5, then pulling out the pin 34 behind the operation shaft 28. In this state, the other rotating member, the cam follower 26, and the holding tool 27, the operating shaft 28, the conical shaft 42, and the holder 39 are simultaneously pulled out and moved backward. At this time, the connector 33 does not move because it is connected to the drive mechanism.

  An embodiment of the present invention will be described with reference to FIGS.

  With the cutting method of the present invention, a small amount of force is sufficient to cut a bar that can be cut by hand with pliers or the like, and thus the mechanism for moving the revolving blade becomes simpler. Hereinafter, the cutting mechanism will be described.

  The fixed blade 51 has a hole having the same shape as the vertically fed bar, and a size through which the bar passes, and the outer periphery is driven into the stepped hole of the holder 51a. Further, the bottom hole of the holder 51a penetrates with a size that allows the rod material to pass through easily, and the outer periphery is fitted into the hole at the tip of the fixed shaft 53. For the material of the fixed blade 51, cemented carbide, alloy tool steel, high-speed tool steel or the like is used.

  The fixed shaft 53 has a through-hole having a size that allows the rod to easily pass through the shaft center. A bar material to be cut from the rear of the through hole is sent, passes through the hole of the fixed blade 51 at the front, and passes through the hole of the revolving blade 52 (when not eccentric). The outer periphery near the tip of the fixed shaft 53 is a ridge. The bearing 54 is fitted to the fixed shaft 53 at the rear of the heel, and the inner ring of the bearing 54 is applied to the heel. The bearing 54 receives a radial load at the time of cutting. Further, a bearing 55 is fitted on the rear fixed shaft 53. The bearing 54 and the bearing 55 are spaced apart from each other with the partition 56b of the center hole of the rotating body 56 interposed therebetween. Further, a collar 57 is fitted on the shaft behind the bearing 55 to open a gap between the rotating body 56 and the mounting leg 58. The shaft passes through the hole of the mounting leg 58, and a nut 59 is fastened to the screw at the rear end of the shaft to fix the shaft to the mounting leg 58, and the partition 56 b of the center hole of the rotating body 56 is connected to the bearing 54 and the bearing 55. The rotating body 56 is fixed in the axial direction between the two.

  The revolving blade 52 has a hole of the same shape as that of the vertically fed bar, and has a size through which the bar passes, and is driven and fitted into the stepped hole of the holder 52a. For the material of the revolution blade 52, cemented carbide, alloy tool steel, high-speed tool steel or the like is used. The bottom hole of the holder 52a is a through hole having a size that allows the cut bar to be easily taken out, leaving a step for receiving the revolving blade 52. The outer periphery of the holder 52a is fitted to the inner ring of the bearing 60. Further, the outer peripheral end portion is a flange, one surface of the flange is applied to the inner ring of the bearing 60, and the opposite surface of the flange is the step of the stepped hole of the holder 61. And minimizes the movement of the holder 52a in the axial direction, leaving a gap that can be idled and rotated. Even so, since the width of the bearing varies, the shim ring must be interposed between one side of the flange and the inner ring of the bearing 60 for adjustment. Further, the outer ring of the bearing 60 is fitted into the stepped hole of the holder 61.

  The outer periphery of the holder 61 is fitted into the hole of the slider 63, and the front end of the outer periphery becomes a flange, and is fixed to the front surface of the slider 63 through a bolt in a flat hole of the flange. Further, a retaining ring 62 having an inner circumference overlapping with the outer ring of the bearing 60 is fixed to the end surface of the holder 61 having no flange with a bolt to hold the bearing 60.

  The slider 63 has a circular outer periphery at the center, and has a hole for fitting the holder 61 in the center of the circle. Further, there are a sliding portion 63 a and a sliding portion 63 b that project symmetrically outward from the circular shape, and are slidably fitted into a groove 56 d on the front surface of the rotating body 56. The projecting outer end surface of the sliding portion 63a is an outward slope, and the projecting outer end surface of the sliding portion 63b is an inward slope.

The cam 64 slides into the groove 56d of the rotator 56, the inner end surface becomes an inclined surface that is in close contact with the inclined surface of the sliding portion 63a, and the outer end contacts the stopper 66 to stop the cam 64 from escaping to the outside. Further, it is fixed integrally with the guide shaft 69 through a bolt in the center of the cam 64. The cam 65 slides into the groove 56d of the rotator 56, the inner end surface becomes a slant surface that is in close contact with the slant surface of the sliding portion 63b, and the outer end is brought into contact with the stopper 67 to stop the cam 65 from escaping to the outside. Further, it is fixed integrally with the guide shaft 69 through a bolt at the center of the cam 65. The stopper 66 and the stopper 67 are fitted into the groove 56d of the rotating body 56, fixed to the bottom surface of the groove 56d with two bolts, and a knock pin penetrating the bottom surface of the groove 56d is hit at the center. The pressing plate 68 is fixed to the front surface of the rotating body 56 with bolts to suppress the slider 63 from jumping out of the groove 56d, but has a gap in which the slider 63 slides.

  The two guide shafts 69 are holes that pass through a plane outside the stepped hole on the front surface of the rotating body 56, and are held by sliding through linear bushings. The rear end of the guide shaft 69 becomes a stepped screw shaft, and the screw shaft passes through the hole of the flange of the operation wheel 70 and is fixed by clamping the flange of the operation wheel 70 with two nuts. Further, depending on the tightening position of the nut of the screw shaft, the position of the cam 64 and the cam 65 is changed in the axial direction, the slider is moved, and the center of the revolving blade 52 is aligned with the rotation center line. Adjustment is made so that the slopes of the cam 64 and the cam 65 can move in close contact with each other.

  The operation wheel 70 is driven by fitting a linear bush 71 into a central hole, and the linear bush 71 is slidably held by a rotating shaft portion 56 c of the rotating body 56. Further, the outer periphery of the plane of the flange of the operation wheel 70 is sandwiched between the two cam followers 72, and the flange can be rotated but restrained in the axial direction. The two cam followers 72 are attached to the holder 73 to make a pair. In addition, the holder 73 is fitted with the stepped shaft at the tip of the operation shaft 74 in an axial hole that is distant from the cam follower 26, and the nut 75 is fastened to the screw at the tip of the stepped shaft. To do. The cam followers 72 are arranged in two pairs together with the operation shaft 74 so as to face each other on the horizontal normal line of the flange.

  The rotating body 56 is a center hole and holds a bearing 54 and a bearing 55 which are fitted to the outer periphery of the fixed shaft 53 and fixed in the axial direction. A V pulley 56a at the rear end of the rotating shaft portion 56c of the rotating body 56 is a motor. Is rotated by a V-belt and rotated at high speed. The rotating body 56 also serves as a spring wheel for cutting the bar. Further, the stepped hole on the front surface of the rotating body 56 becomes a space for moving the holder 61 and the circular outer periphery at the center of the slider 63 laterally.

  When cutting the bar, the rotating body 56 rotates at high speed, the operation wheel 70 rotates by the guide shaft 69, and the member fitted in the groove 56d of the rotating body 56 and the holder 61 also rotate. Further, the holder 52 a and the revolving blade 52 try to rotate by the frictional resistance of the bearing 60. Therefore, if the operation shaft 74 is operated and the operation wheel 70 is moved rearward via the cam follower, the cam 64 and the cam 65 are drawn by the guide shaft 69, and the inclined surface of the cam 64 moves the slider 63 toward the center. The slope of the cam 65 escapes for the amount of lateral movement. For this reason, the holder 61, the bearing 60, the holder 52a, and the revolution blade 52 leave the center of rotation and start eccentric rotation. If the hole of the revolving blade 52 hits the bar, it cannot be rotated eccentrically, but is rotated by the bearing 60 to change to revolving, pushing around the bar while gradually increasing the revolving radius, and the fixed blade 51 has a rotation phase of 180 degrees. The bar is pushed and cut by the difference, and if the revolution radius becomes larger, the bar is sheared and cut. At this time, the bar is about to rotate by cutting the revolution blade 52, but the rotation of the bar is stopped by cutting the fixed blade 51.

DESCRIPTION OF SYMBOLS 1 Fixed blade 32 Linear bush 1a Holder 33 Connecting tool 2 Revolving blade 34 Connecting pin 2a Holder 35 Link ball 3 Fixed shaft 36 Holder 4 Bearing 37 Support stand 5 Eccentric shaft 38 Base plate 5a Twist tooth 39 Holder 6 Bearing 40 Clasp 7 Toothed wheel 41 Pin 8 Operation wheel 42 Conical shaft 9 Guide shaft P Rotating center line 10 Rotating body Q Eccentric wire 10a V pulley θ Rotating movement angle 10b Partition S Position of the hole of the revolving blade 2 that has rotated 11 Bearing C Torsion tooth Tooth profile 12a Bearing 51 Fixed blade 13 Collar 51a Holder 14 Mounting leg 52 Revolving blade 15 Nut 52a Holder 16 Eccentric ring 53 Fixed shaft 17 Push screw 54 Bearing 18 Pull screw 55 Bearing 19 Linear bush 56 Rotating body 20 Retaining ring 56a V pulley 21 Seal 56b Partition 22 Retaining ring 56c Rotating shaft portion 23 Seal 56 d Groove 24 of rotating body 57 Retaining ring 57 Collar 25 Set screw 58 Mounting leg 26 Cam follower 59 Nut 27 Holder 60 Bearing 28 Operation shaft 61 Holder 29 Nut 62 Retaining ring 30 Knock pin 63 Slider 31 Linear bushing 63a Slider portion 63b Slider slide Portion 64 Cam 65 Cam 66 Stopper 67 Stopper 68 Presser plate 69 Guide shaft 70 Operation wheel 71 Linear bushing 72 Cam follower 73 Holder 74 Operation shaft

Claims (2)

  Two blades that are large enough to pass the rod you want to cut and have the same shape as the outer shape of the rod are placed on top of each other so that you can pass the rod, and one blade is fixed. One blade becomes a revolving blade, and the revolving blade holder can be rotated together with a rotating body such as a cutting wheel of a cutting machine, and is operated by an additional mechanism around a position eccentric from the rotation center of the rotating body. Attach it to the rotating body so that it can rotate only a certain angle, attach a radial bearing to this holder, align the center of the hole of the revolving blade with the radial bearing, and rotate the revolving blade freely If the holder is rotated as much as possible and the additional mechanism is operated while rotating the rotating body to rotate the holder by a certain angle, the center of the hole of the revolving blade starts to deviate from the rotating center of the rotating body and begins to rotate eccentrically. If the hole of the revolution blade hits the bar, eccentric rotation cannot be achieved with a radial bearing. The revolving blade rotates around the outer periphery of the bar and gradually pushes the bar through the hole. The bar that has been pushed out is laterally displaced, and the lateral displacement is 180 degrees with the rotational phase difference of the fixed blade. A method of cutting a bar, characterized in that the bar is sheared when it is pushed through a hole and the revolution radius is increased, so that the bar can be cut.   Two blades that are large enough to pass the rod you want to cut and have the same shape as the outer shape of the rod are placed on top of each other so that you can pass the rod, and one blade is fixed. One blade becomes a revolving blade, and the holder of the revolving blade can rotate with a rotating body such as a cutting wheel of a cutting machine and can be operated by an additional mechanism to move in the normal direction of the rotating body. A radial bearing is attached to this holder, the center of the hole of the revolving blade is aligned with the rotation center of the rotating body with the radial bearing, and the revolving blade is held so that it can freely rotate. If the additional mechanism is operated while rotating the holder, the center of the hole of the revolving blade starts to deviate from the center of rotation of the rotating body and starts to rotate eccentrically. Unable to rotate and idles in radial bearings to change to revolution. The bar is gradually pushed through the hole, and the pushed bar is laterally displaced, and the laterally displaced part is pushed through the hole of the fixed blade with a rotational phase difference of 180 degrees, and if the revolution radius is increased, the bar is sheared. A method for cutting a bar material, characterized in that it can be cut.

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