JP2020075293A - Wire molding machine, and manufacturing method of wire molding - Google Patents

Abstract

To provide a wire molding machine capable of improving productivity; and to provide a manufacturing method of a wire molding.SOLUTION: A wire molding machine 10 includes a base driving device 40 having a movable base 50 repeating a cycle operation for molding a wire 90 fed from a wire feeder 70 into a ring 91 by molding tools 21, 22, 23, and separating it from a subsequent wire 90 by a cutting device 30, operated synchronously with the wire feeder 70, and movable together with a rear end part 91E of the ring 91. The cutting device 30 is loaded on the movable base 50, and cuts the wire 90, while moving together with the rear end part 91E of the ring 91.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a wire rod molding machine and a method of manufacturing a wire rod molded product that repeats an operation of molding a wire rod fed from a wire rod feeding device into a wire rod molded product and separating the wire rod molded product from a subsequent wire rod.

  Known wire rod forming machines have various structures for forming various wire rod molded products such as piston rings, compression coil springs, and torsion coil springs. Further, in any of these wire rod forming machines, the operation of intermittently feeding the wire rod by a constant length to form a wire rod molded article and separating it from the subsequent wire rod is repeated (for example, refer to Patent Documents 1 to 3).

JP, 2003-010937, A JP 2001-239341 A JP-A-63-020133

  It is desired to improve the productivity of the above conventional wire rod forming machine.

  In order to solve the above-mentioned problems, the invention of claim 1 forms a ring-shaped wire rod molded product from a wire rod fed from a wire rod feeder, and a subsequent wire rod is cut by a cutting device. In a wire rod molding machine that repeats the cycle operation of disconnecting, a low speed feeding period in which the wire rod feeding speed is lowered is provided during one cycle of the cycle operation, and the wire rod feeding device operates in synchronization with the wire rod feeding device, and the low speed feeding period. A base driving device having a movable base that is movable along an arcuate locus along with the rear end portion of the wire rod molded product is provided, and the cutting device is mounted on the movable base, and the cutting device is installed during the low-speed feeding period. The wire rod forming machine cuts the wire rod while moving together with the rear end of the wire rod molded product.

  According to a second aspect of the present invention, in the base drive device, a first drive mechanism that moves the movable base so as to draw the arc locus, and move the movable base in a direction intersecting a tangential direction of the arc locus. The 2nd drive mechanism is provided, The grinder which is rotationally driven centering | focusing on the rotating shaft orthogonal to the moving direction of the said movable base by the said 2nd drive mechanism is provided with the said cutting device. This is a wire rod forming machine.

  In the invention of claim 3, when the grindstone cuts the wire rod, the grindstone moves at the same speed as the cutting surface of the wire rod in the tangential direction of the arc locus, and after cutting, the cutting surface of the wire rod in the tangential direction. The wire rod forming machine according to claim 2, wherein the wire rod forming machine moves at a higher speed to move away from the cut surface.

  In the invention of claim 4, the movable base comprises a first movable base and a second movable base, and the first and second movable bases move together by the first drive mechanism, and One movable base is configured to be independently movable with respect to the other movable base by the second drive mechanism, the first movable base is equipped with the cutting device, and the second movable base is The wire rod molding machine according to claim 2 or 3, wherein a clamper that clamps a portion of the wire rod that is cut by the cutting device is mounted.

  According to a fifth aspect of the invention, the cycle operation of molding the wire fed from the wire feeding device into a ring-shaped wire molded product with a molding tool and separating it from the subsequent wire is repeated to obtain a plurality of the wire molded products. In the method of manufacturing a wire rod molded article to be manufactured, a low speed feeding period in which a wire rod feeding speed is reduced is provided during one cycle of the cycle operation, and the wire rod is synchronized with the wire rod feeding device during the low speed feeding period. A method for manufacturing a wire rod molded product, in which the rear end portion of the wire rod molded product is separated from the subsequent wire rod while moving the cutting device together with the rear end portion of the molded product so as to draw an arc locus.

  According to a sixth aspect of the present invention, as the cutting device, a device provided with a rotationally driven grindstone is used, and the grindstone is advanced and retracted in a direction intersecting a tangential direction of the arc locus to cut the wire rod. 5 is a method for manufacturing a wire rod molded product.

  In the invention of claim 7, when cutting the wire rod, the grindstone is moved in the tangential direction of the arc locus at the same speed as the cutting surface of the wire rod, and after the cutting, the grindstone is moved in the tangential direction of the wire rod. The method for manufacturing a wire rod molded article according to claim 6, wherein the wire rod molded article is moved at a speed faster than the cut surface and separated from the cut surface.

  The wire rod forming machine according to the first aspect repeats the cycle operation in which the wire rod fed from the wire rod feeding device is formed into a ring-shaped wire rod molded product and then cut off from the subsequent wire rod by the cutting device. If the feeding is stopped during molding of the wire, traces (hereinafter referred to as "molding start marks") may remain on the wire when the wire is re-sold. Can decrease. On the other hand, the wire rod forming machine according to claim 1 has a movable base that is movable along a rear end portion of the wire rod molded article along an arcuate trajectory, and the movable base is mounted on the movable base, and the rear end portion of the wire rod molded article is mounted. While moving with it, cut the wire. That is, according to the wire rod molding machine of the present invention, a plurality of wire rod molded products can be sequentially manufactured without stopping the feeding of the wire rod. As a result, generation of molding start marks is suppressed and production efficiency is improved.

  Further, as the cutting device, a device provided with laser cutting, water jet cutting, a cutter, and a grindstone is exemplified. When the cutting device is provided with a grindstone, the grindstone may be moved back and forth with respect to the wire rod in a direction intersecting the moving direction of the rear end of the wire rod molded product, as in the inventions of claims 2 and 6. .. In that case, when the grindstone cuts the wire, it moves at the same speed as the cut surface of the wire, and after the cutting, moves at a speed faster than the cut surface of the wire and moves away from the cut surface (claim 3, 7), the interference between the subsequent wire rod and the grindstone can be reliably prevented.

  According to the invention of claim 5, similarly to the invention of claim 1, it is possible to improve the production efficiency in manufacturing the wire rod molded product.

(A) A front view of the wire rod molding machine according to the first embodiment of the present disclosure, (B) A partially cutaway front view of a cutting device and a clamper when the wire rod is formed into a ring shape, (A) A partially cutaway front view of the cutting device and the clamper when the movable base is rotated, (B) A front sectional view of the cutting device that moves forward with the clamper and cuts the wire rod (A) A front cross-sectional view of the clamper and the cutting device retracting, (B) A partially cutaway front view of the cutting device and the clamper starting to return from the rotation end position to the rotation origin position Perspective view of cutting device and clamper when wire is being cut (A) Mechanical diagram of wire rod forming machine, (B) Mechanical diagram of wire rod forming machine according to another embodiment The front view of the cutting device of the wire rod molding machine which concerns on other embodiment.

[First Embodiment]
Hereinafter, the wire rod forming machine 10 of this embodiment shown in FIGS. 1 to 5 will be described. As shown in FIGS. 1A and 4, the wire rod forming machine 10 turns the wire rod 90 fed from the wire rod feeding device 70 into an arc shape by the first to third forming tools 21, 22, and 23. It is wound to form a ring 91 (for example, a C-shaped ring such as a piston ring, see FIG. 3) as a wire rod molded product. The cross section of the wire rod 90 has, for example, a rectangular shape, a keystone, a taper, a barrel, or an eccentric barrel, and the wire rod feeding device 70 extends the wire rod 90 in a horizontal direction to feed the wire rod 90. Hereinafter, the horizontal direction in which the wire rod 90 is fed will be referred to as the horizontal direction H1, and the horizontal direction orthogonal thereto will be referred to as the front-back direction H2 (see FIG. 5).

  The first to third forming tools 21, 22, and 23 are supported by, for example, a support base 53 (see FIG. 1A) and extend forward in a cantilever shape. Further, the first forming tool 21 is arranged at a position where it comes into contact with a straight line portion of the wire rod 90 extending from the wire rod feeding device 70 from above, and the second forming tool 22 moves the wire rod 90 of the wire rod 90 relative to the first forming tool 21. It is arranged slightly downward at the front in the feeding direction. Then, the wire rod 90 is pressed by the wire rod feeding device 70, pressed against the second forming tool 22 and directed downward, and is formed into an arc shape. The third forming tool 23 is arranged between the first and second forming tools 21 and 22, and the third forming tool 23 comes into contact with a portion of the wire 90 curved in an arc shape from below. As a result, the wire rod 90 is formed into a ring shape around the imaginary winding center C1 (see FIG. 1 (A)) extending in the front-rear direction H2 below the third forming tool 23 to form a wire rod molded product. Become ring 91. A guide tool 24 supported by, for example, a support base 53 is provided below the second forming tool 22 and abuts on the arc-shaped wire rod 90 from the inside. Then, by adjusting the positions of the first to third forming tools 21, 22, 23 and the guide tool 24, the radius of curvature of the arc of the wire rod 90 to be formed is changed.

  The ring 91 formed as described above is separated from the subsequent wire rod 90 by the cutting device 30 (see FIGS. 2B and 4). As shown in FIG. 1 (B), the ring 91 before being separated from the subsequent wire rod 90 rotates around the winding center C1 by the feeding of the subsequent wire rod 90 and is guided slightly forward by the guide tool 24. Then, the wires 90 are stacked on the front side of the succeeding wire rod 90. On the other hand, in the present embodiment, the cutting device 30 moves back and forth while rotating together with the rear end portion 91E of the ring 91 so that the ring 91 is separated from the subsequent wire rod 90 without stopping the feeding of the wire rod 90. It has become.

  Specifically, the cutting device 30 includes, for example, a disc-shaped grindstone 31 and is supported by a grindstone moving mechanism 40A conceptually shown in FIG. The grindstone moving mechanism 40A includes a linear base 44 supported by a fixed base 43 so as to linearly move in the front-rear direction H2, and a first linear base 44 supported by the linear base 44 so as to rotate around a winding center C1. The movable base 51 and the cutting device 30 are mounted on the first movable base 51. The cutting device 30 is arranged such that the grindstone 31 is located below the winding center C1 in a plane including the winding center C1, for example. The position of the linear movement base 44 is controlled by a first servo motor (not shown), and the first movable base 51 is controlled by a second servo motor (not shown). The grindstone 31 of the cutting device 30 causes the rear end portion 91E of the ring 91 to be controlled by the feeding servo motor (not shown) that is a drive source of the wire rod feeding device 70 and the first and second servo motors. As described above, the ring 91 is separated from the succeeding wire rod 90 without stopping the feeding of the wire rod 90 by linearly moving and rotating in synchronism with the above operation.

  In addition, for example, as shown in FIG. 5B, the grindstone moving mechanism 40A has a structure in which a linear base 47 is movably supported by a rotary base 46 rotatably supported by a fixed base 43. The cutting device 30 may be mounted on the linear motion base 47.

  When the wire rod 90 is cut by the cutting device 30 as shown in FIG. It is provided and supported by the clamper moving mechanism 40B. The clamper moving mechanism 40B has a second movable base 52 that rotates around the winding center C1, and the clampers 60 and 65 are attached to the second movable base 52. The clampers 60 and 65 have a power source such as an air actuator or a solenoid, and can be switched between a clamp state and an unclamp state by on / off control.

  The clamper moving mechanism 40B receives the rotational power around the winding center C1 from the second servo motor via a power transmission mechanism (not shown) provided between the clamper moving mechanism 40B and the grindstone moving mechanism 40A, and the second movable base 52 rotates. The second movable base 52 may rotate in synchronization with the rotation of the first drive mechanism 41 by providing a servomotor that is a power source different from the first drive mechanism 41. You may be allowed to do so.

  In the present embodiment, the "base drive device 40" is composed of the first movable base 51, the second movable base 52, the grindstone moving mechanism 40A, and the clamper moving mechanism 40B. In addition, in the present embodiment, the mechanism for rotating the first movable base 51 of the grindstone moving mechanism 40A and the mechanism for rotating the second movable base of the clamper moving mechanism 40B allow the first and second movable bases to be rotated. A “first drive mechanism 41” that drives 51 and 52 in the first direction, which is the moving direction of the rear end portion 91E of the ring 91, is configured. In addition, the "second drive mechanism 42" that moves the first movable base 51 in the direction intersecting the first direction by the mechanism that directly moves the linear movement base 44 with respect to the fixed base 43 in the grindstone moving mechanism 40A is provided. It is configured. In the following, the first movable base 51 and the second movable base 52 will be collectively referred to as the movable base 50 as appropriate.

  The first servo motor, the second servo motor, the feeding servo motor, and the like of the wire rod forming machine 10 of the present embodiment are controlled so that the grindstone 31 of the cutting device 30 is arranged at the following position. That is, at the rotation origin position shown in FIGS. 1 (A) and 1 (B), for example, the grindstone 31 is disposed substantially directly below the winding center C1 of the ring 91, and the rotation end position is rotated. The position is approximately 30 to 90 degrees counterclockwise from the origin position. Then, the grindstone 31 rotates from the rotation origin position to the rotation end position at the same angular velocity as that of the arc-shaped portion of the wire rod 90 (hereinafter, referred to as “arc portion of the wire rod 90”) (see FIG. 2 (A)), during which the grindstone 31 reciprocates back and forth to cut the wire 90 (see FIG. 2B), and the arc-shaped wire 90 is separated from the subsequent wire 90 as a ring 91. (See FIG. 3 (A) and FIG. 3 (B)).

  Here, the wire rod feeding device 70 performs the first feeding process of feeding the wire rod 90 so that the angular velocity of the arc portion of the wire rod 90 becomes the first angular velocity ω1 (see FIG. 1A), and The second feeding process of feeding the wire rod 90 is repeated so that the angular velocity of the arc portion becomes the second angular velocity ω2 (see FIG. 2A) that is smaller than the first angular velocity ω1. Then, the wire rod feeding device 70 such that the feeding amount of the wire rod 90 during the feeding cycle in which the feeding cycle operation including the first feeding process and the second feeding process is performed becomes the entire length of the ring 91. The feeding servo motor is controlled. Further, when the wire rod feeding device 70 is started from the stopped state, an initial motion process of feeding the wire rod 90 so as to have the second angular velocity ω2 is performed, and then the above-described feeding cycle operation is repeated.

  While the circular arc portion of the wire rod 90 is moving at the constant second angular velocity ω2, the grindstone 31 moves from the position near the rotation origin position to the rotation end position at the constant second angular velocity ω2 that is the same as the circular arc portion of the wire rod 90. Rotate toward a position near. Further, for example, when the circular arc portion of the wire rod 90 starts to accelerate from the constant second angular velocity ω2, the grindstone 31 reduces the rotation speed and stops, and reverses the rotation direction (see FIG. )), While the arc portion of the wire rod 90 is rotating at the first angular velocity ω1, the wire rod 90 is rotated from the rotation end position to the rotation origin position at the third angular velocity ω3 larger than the second angular velocity ω2. And return to the state of.

  In addition, the second drive mechanism 42 starts to cut the wire rod 90 by the grindstone 31 while the first drive mechanism 41 rotates the first movable base 51 at the constant second angular velocity ω2, and finishes cutting. (Refer to FIG. 2 (B)), the first movable base 51 is moved back and forth (see FIG. 3 (A)), and the first movable base 51 is moved in the front-rear direction H2 so as to move backward from the arc portion of the subsequent wire rod 90. Move to.

  Further, the clampers 60 and 65 are in an unclamped state when the movable base 50 is located at the rotation origin position. Then, the clampers 60 and 65 clamp the two positions of the wire rod 90 sandwiching the planned cutting position at the timing before the cutting of the wire rod 90 is started while the grindstone 31 moves at the constant second angular velocity ω2. Then, the grindstone 31 is unclamped at a timing after the grindstone 31 is separated from the wire 90 after cutting (FIG. 3B shows a state after unclamping).

  The ring 91 (see FIG. 3B) separated from the subsequent wire rod 90 is discharged and collected by a discharge means (not shown) provided on the front side of the wire forming machine 10.

  In order to synchronize the servo motors with each other, the ROM of the control board provided in the controller 80 (see FIG. 1A) is fed to the ROM at each unit time for subdividing the feeding cycle into a plurality of units. A first data map in which the rotational position of the servo motor for the vehicle is associated is stored. Then, when the controller 80 is operated, the feeding servomotor is position-controlled to the rotational position based on the first data map every time a unit time elapses, whereby the angular velocity of the arc portion of the wire material 90 is set to the first value. The wire rod 90 is fed so as to alternately switch to the second angular velocities ω1 and ω2. Further, by operating the speed changing button of the controller 80, the unit time is changed and the feeding speed of the wire rod 90 and the first and second angular velocities ω1 and ω2 are changed.

  In addition, the ROM stores a second data map in which the rotational positions of the first servo motor and the second servo motor are associated with the rotational positions of the feeding servo motor for each unit time. A third data map in which the clamp and unclamp timings of the clampers 60 and 65 are associated with each rotational position of the feeding servo motor for each time is stored. Then, based on the rotational position of the feeding servo motor, the first servo motor and the second servo motor are controlled so as to follow the feeding servo motor while maintaining the correspondence relationship of the second data map. , The power sources of the clampers 60 and 65 are controlled so as to maintain the correspondence relationship of the third data map.

  When the wire rod forming machine 10 is started, for example, the wire rod 90 is fed by a manual operation from the wire rod feeding device 70, and the wire rod 90 is formed into a substantially 3/4 circular shape and stopped. When the CPU of the control board executes the control program stored in the ROM of the control board, the above-described initial motion process is executed and the wire rod feeding device 70 rotates the arc portion of the wire rod 90 at a constant second angular velocity ω2. The base drive device 40 causes the movable base 50 to rotate at a constant second angular velocity ω2 while being moved. Then, the first movable base 51 of the movable base 50 is activated so as to move forward. The rotational position of the feeding servo motor at the forward start timing of the first movable base 51 is set to the position that is the forward start timing of the first movable base 51 in the second data map, and the feed is performed. After the rest of the cycle has been carried out, a continuous operation is carried out in which the feeding cycle is repeated.

  The description of the configuration of the wire rod forming machine 10 of the present embodiment is as above. Hereinafter, the effects of the wire rod molding machine 10 of the present embodiment and the method of manufacturing the ring 91 using the wire rod molding machine 10 will be described. As described above, in the wire rod forming machine 10 and the manufacturing method of the present embodiment, it is possible to sequentially manufacture the rings 91 that are a plurality of wire rod molded products without stopping the feeding of the wire rod 90. Here, in the conventional wire rod forming machine and manufacturing method, since the feeding is stopped during the forming of the wire rod 90, a forming start trace may remain on the wire rod 90 when the wire rod 90 is re-sent, and the forming start trace is removed. Due to this, the decrease in production efficiency was a problem.

  On the other hand, according to the wire rod forming machine 10 and the manufacturing method of the present embodiment, since the generation of the molding start mark is suppressed, the removal process of the molding start mark can be eliminated or reduced, and the production efficiency can be improved. At the same time, the quality of the ring 91 can be improved. In addition, in the wire rod forming machine 10 and the manufacturing method of the present embodiment, in one cycle of the cycle operation in which the ring 91 is repeatedly formed, the feed speed of the wire rod 90 is reduced to a low speed feed period (the first movable base 51 has an angular velocity). Since the wire material 90 is cut during the period of moving at an angular velocity less than ω1, the quality of the cut surface can be stabilized. Moreover, since the wire rod 90 is cut while being clamped, the quality of the cut surface can be stabilized also by this.

  Further, in the present embodiment, when the wire rod 90 has a cross section of, for example, a rectangle, a keystone, a taper, a barrel, or an eccentric barrel, the wire rod feeding device 70 causes the wire rod feeding device 70 to have a crosswise direction. The wire rod 90 is fed so that the wire rod faces the axial direction of the ring 91, and the grindstone 31 moves in the axial direction of the ring 91 when the wire rod 90 is cut, so that the wire rod 90 can be easily cut. You can

[Second Embodiment]
In the second embodiment, the angular velocity of the rotation of the first movable base 51 by the first drive mechanism 41 is not constant while the second drive mechanism 42 advances and retracts the first movable base 51. , Different from the first embodiment. Specifically, the first driving mechanism 41 causes the first movable base 51 to move the ring until the cutting device 30 cuts the wire 90 and is separated rearward from the arc portion of the subsequent wire 90. It rotates at an angular velocity faster than the angular velocity of the cut surface of the rear end portion 91E of 91 (that is, the second angular velocity ω2 which is the angular velocity of the second movable base 52). With this configuration, after the cutting device 30 has finished cutting the wire and before the angular velocity of the first movable base 51 begins to increase, at least the other clamper 65 of the clampers 60, 65 may be unclamped.

  In the present embodiment, when cutting the wire rod 90, the grindstone 31 moves at the same speed as the cutting surface of the rear end portion 91E of the wire rod 90 in the first direction that is the moving direction of the rear end portion 91E of the ring 91, After the cutting, it moves in the first direction at a speed faster than the cut surface of the wire rod 90 and moves away from the cut surface, so that the interference between the subsequent wire rod 90 and the grindstone 31 can be surely prevented. ..

[Other Embodiments]
(1) In the above embodiment, the cutting device 30 that cuts the wire rod 90 with the grindstone 31 is provided, but even if a cutting device that cuts the wire rod 90 by laser cutting, water jet cutting, or a cutter is provided. Good. As an example of the cutting device 30W including the cutter 31W, as shown in FIG. 6, there is a device that cuts the wire rod 90 by shearing with the front and rear cutters 31W and 31W. Further, when the cutting device 30 cuts with a laser or a water jet, the second drive mechanism 42 may not be provided.

  (2) In the above embodiment, the grindstone 31 is moved in the axial direction of the ring 91 in order to cut the wire rod 90. However, the grindstone 31 intersects the first direction, which is the moving direction of the rear end portion 91E of the ring 91. It may be moved in the second direction, and may be moved in the radial direction of the ring 91, for example. In this case, the moving direction of the grindstone 31 may be the vertical direction or the horizontal direction H1.

  (3) In the above embodiment, both sides of the cut portion of the wire rod 90 are clamped by the clampers 60 and 65, but one side portion of the cut portion of the wire rod 90 may be clamped by either the clamper 60 or the clamper 65. Good. In addition, in the above-described embodiment, a pair of clampers 60 or 65 may be provided and arranged on both sides of the cut portion of the wire rod 90.

  (4) In the above embodiment, the feeding speed of the wire rod 90 by the wire rod feeding device 70 is not constant, but it may be constant (for example, the angular velocity of the arc portion of the wire rod 90 becomes the second angular velocity ω2). Feeding speed). In this case, the cutting device 30 cuts the wire rod 90 while moving together with the rear end portion of the wire rod molded product, thereby shortening the cycle time and improving the production efficiency.

  (5) In the above embodiment, the wire rod molded product formed from the wire rod 90 by the wire rod molding machine is the ring 91. However, the present invention is not limited to this. For example, a compression coil spring, a tension coil spring, or a torsion coil spring. And so on. As a wire rod forming machine for forming such a coil spring, in FIG. 6, a wire rod 90 is formed by a forming tool T1 to form a coil portion 91W, and a linear portion 91S of the wire rod 90 that follows the rear end of the coil portion 91W. What is cut by the cutting device 30W is shown. This wire rod forming machine also has a configuration in which the cutting device 30W mounted on the movable base cuts the wire rod 90 while moving together with the rear end portion of the wire rod molded product (along with the straight line portion 91S). In this case, even if the conventional cutting method of stopping the feeding of the wire rod 90 when cutting the wire rod 90 is adopted, the above-mentioned "molding start mark" does not occur, but according to the configuration of the figure, the cycle time It is possible to improve the production efficiency by shortening. The cutting device 30W may perform the cutting of the wire rod 90 during the forming of the wire rod 90 by the forming tool T1 or when the forming tool T1 is separated from the wire rod 90.

  (6) Although the movable base 50 is configured to rotate in the above embodiment, it may be configured to move linearly. In this case, for example, as shown in FIG. 6, the movable base moves together with the rear end portion (straight portion 91S) of the wire rod molded product that is linearly moving.

(7) In the above embodiment, when the wire rod 90 is cut by the grindstone 31, the first movable base 51 rotates from the rotation origin position to the rotation end position at the same angular velocity as the arc portion of the wire member 90. However, the wire rod 90 may be rotated at an angular velocity slower than that of the arc portion of the wire material 90, or may be rotated at a higher angular velocity.

10 wire rod forming machine 30 cutting device 31 grindstone 40 base drive device 41 first drive mechanism 42 second drive mechanism 50 movable base 51 first movable base 52 second movable base 60 clamper 65 clamper 90 wire rod 91 ring

Claims (7)

In a wire rod forming machine that repeats the cycle operation of forming a ring-shaped wire rod molded product with a molding tool, the wire rod fed from the wire rod feeding device, and cutting it from the subsequent wire rod with a cutting device,
A low speed feeding period in which the wire feeding speed is reduced is provided during one cycle of the cycle operation,
A base drive device that operates in synchronization with the wire rod feeding device and has a movable base that is movable along a rear end portion of the wire rod molded article along an arc locus during the low speed feeding period;
The cutting device is mounted on the movable base and cuts the wire rod while moving with the rear end of the wire rod molded product during the low-speed feeding period. The base driving device includes a first driving mechanism that moves the movable base so as to draw the arc locus, and a second driving mechanism that moves the movable base in a direction intersecting a tangential direction of the arc locus. The
The wire rod forming machine according to claim 1, wherein the cutting device includes a grindstone that is driven to rotate about a rotation axis that is orthogonal to a moving direction of the movable base by the second drive mechanism.   When cutting the wire rod, the grindstone moves at the same speed as the cutting surface of the wire rod in the tangential direction of the arc locus, and after cutting, moves at a speed faster than the cutting surface of the wire rod in the tangential direction. The wire rod forming machine according to claim 2, which is separated from the cut surface. The movable base comprises a first movable base and a second movable base,
The first and second movable bases are moved together by the first drive mechanism, and one movable base is independently movable by the second drive mechanism with respect to the other movable base. Was
The first movable base is equipped with the cutting device,
The wire rod forming machine according to claim 2 or 3, wherein the second movable base is equipped with a clamper that clamps a portion of the wire rod that is cut by the cutting device. Manufacture a plurality of wire rod molded products by repeating the cycle operation of molding the wire rod fed from the wire rod feeder into a ring-shaped wire rod molded product with a molding tool and separating it from the subsequent wire rod In the method
A low-speed feeding period in which the wire feeding speed is lowered is provided during one cycle of the cycle operation,
During the low-speed feeding period, the rear end of the wire rod molded article is moved from the subsequent wire rod while moving the cutting device together with the rear end of the wire rod molded article in a circular arc locus in synchronization with the wire rod feeder. A method for manufacturing a wire rod molded product to be separated. As the cutting device, one having a whetstone that is rotationally driven is used,
The method for producing a wire rod molded article according to claim 5, wherein the grindstone is advanced and retracted in a direction intersecting a tangential direction of the arc locus to cut the wire rod.   When cutting the wire rod, the grindstone is moved in the tangential direction of the arc locus at the same speed as the cutting surface of the wire rod, and after the cutting, the grindstone is moved in the tangential direction at a faster speed than the cut surface of the wire rod. The method for manufacturing a wire rod molded article according to claim 6, wherein the wire rod molded article is separated from the cut surface.