JP2018149661A - Bar cutting machine comprising constant rate of feeding unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bar cutting machine comprising a constant rate of feeding unit reducing a slip flaw developed on an outer peripheral surface of a rod.SOLUTION: A hydraulic cylinder 21 of a first bar gripping device 2 is operated so that an outer periphery of a bar 104 can be gripped by gripping claws 22A and 22B. Next, a servo motor 6 is operated to move the first bar gripping device 2 toward a bar cutting machine 103 by a predetermined distance. After a tip surface of the bar 104 is stopped by abutting on a stopper 81, a pneumatic cylinder 31 of a second bar gripping device 3 is operated so that an outer periphery of the rod 104 can be gripped by a pair of gripping rollers 32A and 32B. Subsequently, when a movable tooth 83 is lowered with respect to an anchor tooth 82 to cut the bar 104, a forging material 84 with a predetermined length is obtained.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a bar cutting machine provided with a constant-size feeding device. More specifically, the present invention relates to a bar cutting machine equipped with a sizing feed device for feeding a bar to a bar cutting machine in order to cut a long bar in the axial direction such as a round bar, a pipe, and a deformed bar. .

  In order to cut a long bar, which is a raw material, into a predetermined length, a bar cutting machine using saw teeth or shear is used. A conventional bar cutting machine feeds a long bar by a fixed length feeding device by a predetermined length (cutting length), and then repeats the process of cutting by the bar cutting machine to make one long bar. A plurality of bar-shaped materials having a predetermined cutting length are processed from the bar material. In order to manufacture a forging material used for precision forging, a long bar is sent in the axial direction by a predetermined length to abut against the stopper, and the long bar is cut while pressing the end face against the stopper. A shearing machine is known (Patent Document 1). A conventional sizing device grips a long bar with a pinch roller of the sizing device and pressurizes it in the axial direction (Patent Documents 2 and 3).

  However, a conventional fixed-size feeding device using a pinch roller grips the outer periphery of a bar with a plurality of rollers, feeds a long bar by a predetermined length by rotating the roller, and rotates the bar with a rotating roller. Cut while pressing the tip of the plate against the stopper. Therefore, during the pressing of the long bar, the roller may have a slip damage on the outer peripheral surface of the bar. When a slip scratch is attached to a bar, product defects and cracks may occur during precision forging in the subsequent process, which may cause quality defects.

Japanese Patent Laid-Open No. 06-079519 Japanese Patent Laid-Open No. 08-318425 JP 2010-269388 A

  The present invention has been invented against the background as described above, and achieves the following objects. An object of the present invention is to provide a bar cutting machine provided with a constant-size feeder that reduces damage, deformation, and the like attached to the outer peripheral surface of the bar.

The present invention employs the following means in order to solve the above problems.
That is, the bar cutting machine provided with the fixed-size feeding device of the present invention 1
A housing constituting the main body;
A first bar gripping device provided in the housing, capable of gripping the outer periphery of a bar long in the axial direction with a first gripping member so as to be opened and closed, and guided to be movable in the axial direction;
A first opening / closing mechanism provided in the housing for opening / closing the first gripping member;
A first drive source provided in the housing for driving the first opening / closing mechanism;
A feeding device provided in the housing, for moving the first bar gripping device by a predetermined distance in a direction parallel to the axis of the bar, and feeding the bar;
A stopper for positioning the bar in a predetermined position, in contact with the front end surface of the bar sent by the feeder;
A second bar gripping device provided in the housing, disposed between the first bar gripping device and the stopper, and capable of gripping an outer periphery of the bar with a second gripping member so as to be opened and closed; ,
A second opening / closing mechanism provided on the housing for opening / closing the second gripping member;
A second drive source provided in the housing for driving the second opening / closing mechanism;
It is arranged between the second bar holding device and the stopper, and comprises a bar cutting machine for cutting the positioned bar.

According to a second aspect of the present invention, there is provided the bar cutting machine including the fixed-size feeding device according to the first aspect, wherein the first opening / closing mechanism is configured so that the first gripping member is perpendicular to the axis of the bar. It is a parallel link mechanism that moves
The bar cutting machine provided with the fixed-size feeding device of the third aspect of the present invention is the first or second aspect of the present invention.
The feeding device has an impact buffering means for buffering when the bar is in contact with the stopper.

  A bar cutting method according to a fourth aspect of the present invention is the bar cutting machine provided with the constant-size feeding device according to the first or second aspect of the present invention, wherein the feeding device includes a ball nut provided in the first bar gripping device, The ball screw is rotatably supported by a housing and is mounted on the housing and screwed into the ball nut. The servo motor is mounted on the housing and connected to the ball screw.

  The bar cutting machine equipped with the constant-size feeding device of the present invention grips the bar with the second bar gripping device when the bar fed with the first bar gripping device comes into contact with the stopper and stops. Then, the bar is held at the stop position, and the first bar holding device is opened and returned to the original position. Therefore, slip scratches on the outer peripheral surface of the bar material are reduced, and the occurrence of product defects and cracks during precision forging in the subsequent process is reduced.

FIG. 1 is an overall front view showing a bar cutting machine equipped with a fixed-size feeder of the present invention. FIG. 2 is a front view showing the fixed-size feeder of FIG. FIG. 3 is a cross-sectional view taken along the line AA of FIG. 4 is a view taken in the direction of arrow P in FIG. FIG. 5 is a cross-sectional view taken along the line BB of FIG. 6 is a cross-sectional view taken along the line CC of FIG. 7 is a cross-sectional view taken along the line DD of FIG. 8 is a cross-sectional view taken along line EE in FIG. FIG. 9 is an enlarged cross-sectional view of the vicinity of the ball nut of FIG. FIG. 10 is an explanatory view showing a constant-size feeding operation of a bar cutting machine equipped with the constant-size feeding device of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall front view showing a bar cutting machine equipped with a fixed-size feeder of the present invention. As shown in FIG. 1, a bar cutting machine 100 equipped with a fixed-size feeder of the present invention is composed of a bar feeder 101, a fixed-size feeder 102, and a bar cutter 103 in order from the right side of FIG. ing. A long bar 104 is placed on a bar feeder 101 that is long in the left-right direction in FIG. 1, and a fixed-size feeder 102 arranged on the left side of the bar feeder 101 moves the bar 104 by a predetermined distance. Send to the cutting machine 103 side. The front end surface of the bar 104 comes into contact with a stopper (not shown) provided in the bar cutting machine 103 and stops. The bar 104 is fixed by a fixed blade and a movable blade (not shown) of the bar cutting machine 103. Is cut into a forging material of a predetermined length.

  2 is a front view showing the fixed-size feeder 102 shown in FIG. 1, FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2, and FIG. 5 is a cross-sectional view taken along line BB in FIG. 2, FIG. 6 is a cross-sectional view taken along line CC in FIG. 3, FIG. 7 is a cross-sectional view taken along line DD in FIG. FIG. 9 is an enlarged sectional view of the vicinity of the ball nut of FIG. As shown in FIG. 1 to FIG. 8, the fixed dimension feeder 102 includes a hollow rectangular box-shaped housing 1 and a bracket 12 fixed to the bottom plate 11 of the housing 1. The bracket 12 is fixed to the right side surface of the bar cutting machine 103 with a bolt (see FIG. 2). A first bar holding device 2 and a second bar holding device 3 for holding the outer periphery of a bar (shown by a two-dot chain line in FIG. 2) 104 are attached to the housing 1. The second bar holding device 3 is disposed between the first bar holding device 2 and the bar cutting machine 103 and holds the outer periphery of the bar 104 closer to the bar cutting machine 103.

  The first bar holding device 2 has a pair of holding claws 22 </ b> A and 22 </ b> B that are opened and closed by a hydraulic cylinder (first drive source) 21. The hydraulic cylinder 21 is a trunnion type hydraulic cylinder, and a shaft portion 211 of the hydraulic cylinder 21 is pivotally supported on a horizontal portion of an L-shaped support plate 23 as seen in FIG. As shown in FIG. 7, the support plate 23 is composed of a pair of support plates 23 </ b> A and 23 </ b> B that are divided in the vertical direction, and the central portions in the horizontal direction of FIG. 7 are connected and integrated. As shown in FIGS. 3, 6, and 7, two columnar support shafts 24A and 24B are fixed to the support plates 23A and 23B. As shown in FIG. 3, the support shafts 24 </ b> A and 24 </ b> B disposed vertically are disposed at symmetrical positions in the vertical direction with the shaft center of the bar 104 interposed therebetween. A lever 25A and a fan-shaped segment gear 26A are pivotally supported on the upper support shaft 24A so as to be swingable. Similarly, on the lower support shaft 24B, a lever 25B and a fan-shaped segment gear 26B are pivotally supported. The lever 25A and the segment gear 26A are fixed with bolts, and the lever 25B and the segment gear 26B are fixed with bolts and integrated. The teeth of the upper segment gear 26A mesh with the teeth of the lower segment gear 26B.

  The tip of the piston rod 212 of the hydraulic cylinder 21 is connected to the upper end of the upper lever 25A by a pin 213. The left end of the upper lever 25A is connected to the claw holder 27A by a pin 271A. The left end of the lower lever 25B is connected to the claw holder 27B by a pin 271B. The gripping claws 22A and 22B are fixed to the claw holders 27A and 27B on the axial center side of the bar 104 with bolts, respectively. The gripping claws 22 </ b> A and 22 </ b> B are formed in a V shape on the shaft core side of the bar 104. The upper end (as viewed in FIG. 2) of the claw holder 27A is connected to the upper end of the support plate 23B and the flat lever 28A. The right end of the upper lever 28A is connected to the upper end of the support plate 23B by a pin 281A, and the left end of the lever 28A is connected to the upper end of the claw holder 27A by a pin 282A (see FIG. 2). The pin 282A is pivotally supported by a flat plate 272A fixed to the upper end of the claw holder 27A. Similarly, the lower end (as viewed in FIG. 2) of the claw holder 27B is connected to the lower end of the support plate 23B by a flat lever 28B. The right end of the lower lever 28B is connected to the lower end of the support plate 23B by a pin 281B, and the left end of the lever 28B is connected to the lower end of the claw holder 27B by a pin 282B (see FIG. 2). The pin 282B is pivotally supported by a flat plate 272B fixed to the lower end of the claw holder 27B.

  As shown in FIG. 2, the upper link mechanism (first opening / closing mechanism) composed of the support plate 23B, the lever 25A, the claw holder 27A, the flat plate 272A, and the lever 28A forms a four-bar linkage mechanism. Similarly, the lower link mechanism (first opening / closing mechanism) including the support plate 23B, the lever 25B, the claw holder 27B, the flat plate 272B, and the lever 28B also forms a four-bar link mechanism. As shown in the lower four-bar link mechanism, since the lengths of the opposing links are the same (L1 = L2, L3 = L4), the lower four-bar link mechanism forms a parallel link mechanism. Similarly to the lower side, the upper four-bar link mechanism has the same opposing link length, and thus constitutes a parallel link mechanism.

  Accordingly, when the hydraulic cylinder 21 is operated and the piston rod 212 moves forward, the lever 25A swings counterclockwise (as viewed in FIGS. 2 and 6) about the support shaft 24A. The swinging motion of the lever 25A is transmitted to the segment gear 26B via the segment gear 26A, and the lever 25B also swings clockwise (as viewed in FIGS. 2 and 6) about the support shaft 24B. As a result, the claw holder 27A and the claw holder 27B are moved and closed in the direction perpendicular to the axis of the bar 104 while maintaining the orthogonal state with respect to the axis of the bar 104, and the gripping claws 22A and 22B are closed. With this, the outer periphery of the bar 104 is gripped. Further, when the piston rod 212 of the hydraulic cylinder 21 is retracted, the claw holder 27A and the claw holder 27B are placed outside in a direction perpendicular to the axis of the bar 104 while maintaining a state orthogonal to the axis of the bar 104. The gripping claws 22 </ b> A and 22 </ b> B are moved and moved away from the outer periphery of the bar 104. As shown in FIG. 6, guide bushes 71 and 72 are attached to the axial center position of the bar 104. The guide bush 71 is fixed to the support plate 23 with bolts, and the guide bush 72 is fixed to the right side plate 14 with bolts. The guide bushes 71 and 72 guide the bar 104 passing through the fixed-size feeder 102 so that the bar 104 can be smoothly fed.

As shown in FIGS. 3, 7, and 8, two guide shafts 4 and 4 are fixed between the left side plate (side plate on the bar cutting machine 103 side) 13 and the right side plate 14 of the housing 1. Yes. The guide shafts 4 and 4 have a cylindrical shape that is long in the left-right direction (horizontal direction) in FIGS. 7 and 8, and are arranged in parallel while being spaced apart in the vertical direction (vertical direction). Cylindrical linear bearings 41 and 41 are slidably fitted to the guide shafts 4 and 4, respectively. Circulating steel balls are incorporated in the linear bearings 41 and 41 so that the linear bearings 41 and 41 slide smoothly along the guide shafts 4 and 4. A single ball screw 5 is rotatably supported between the left side plate 13 and the right side plate 14 of the housing 1.
The ball screw 5 is disposed at an intermediate position in the vertical direction of the guide shafts 4 and 4 and is disposed in parallel (horizontal direction) to the guide shafts 4 and 4. A ball nut 51 is fitted on the ball screw 5. The ball nut 51 incorporates a circulating steel ball, and smoothly slides the ball nut 51 along the rotating ball screw 5. A servo motor 6 is attached to the right side plate 14 below the lower guide shaft 4. A pulley 62 is fixed to the output shaft 61 of the servo motor 6, and is connected by a belt 64 and a pulley 63 fixed to the right end of the ball screw 5. Accordingly, the rotation of the output shaft 61 of the servo motor 6 is transmitted to the ball screw 5, and the ball nut 51 moves along the ball screw 5.

  As shown in FIGS. 3 and 8, the ball nut 51 is fixed to a cylindrical piston 52 with a bolt, and the piston 52 is slidably fitted in a cylinder chamber 54 of a cylindrical cylinder 53. As shown in FIG. 9, compressed air is constantly supplied to the cylinder chamber 54. Accordingly, the piston 52 is always pressed in the right direction in FIGS. 8 and 9, and the nut 55 screwed into the left end of the piston 52 comes into contact with the left end surface of the cylinder 53 to stop the piston 52 from moving in the right direction. ing. The cylinder 53 and the linear bearings 41 and 41 are connected to each other by a plate-like connecting plate 56 with bolts. Further, the connecting plate 56 is connected to the support plate 23A of the first bar holding device 2 with a bolt.

  When the ball nut 51 is moved by the rotation of the servo motor 6, the cylinder 53 is pushed and moved by the ball nut 51 through the compressed air in the cylinder chamber 54. The cylinder 53 moves while being guided by the guide shafts 4 and 4 via the linear bearings 41 and 41, and the first bar holding device 2 connected to the cylinder 53 by the connecting plate 56 is also guided to the guide shafts 4 and 4. Move. When the front end surface of the bar 104 sent by the first bar holding device 2 comes into contact with the stopper, the impact at the time of contact is transmitted from the cylinder 53 to the air in the cylinder chamber 54, and the air in the cylinder chamber 54. Is compressed to reduce the impact. In the embodiment of the present invention, compressed air is constantly supplied to the cylinder chamber 54, but air may be sealed in the cylinder chamber 54. In addition, hydraulic pressure may be constantly supplied to the cylinder chamber 54 or fluid such as oil may be sealed in the cylinder chamber 54. The servo motor 6, the ball screw 5, the ball nut 51, the guide shafts 4 and 4, the linear bearings 41 and 41, etc. constitute the feeding device according to the embodiment of the present invention, and the first rod material gripping device 2 is used as the rod material 104. The bar 104 is fed by moving it by a predetermined distance in a direction parallel to the axis.

  As shown in FIGS. 4, 6, and 7, the second bar holding device 3 has a pair of holding rollers 32 </ b> A and 32 </ b> B that are opened and closed by a pneumatic cylinder (second drive source) 31. . The pneumatic cylinder 31 is a clevis-type pneumatic cylinder. A mounting bracket 33 is fixed to the outer surface of the left side plate 13 of the housing 1 as viewed in FIG. 7, and the shaft portion 311 of the pneumatic cylinder 31 is shaken to the mounting bracket 33. It is pivotally supported. A rectangular window 15 is formed on the left side plate 13 of the housing 1, and the bar 104 is sent to the bar cutting machine 103 side through the window 15. A support fitting 34 is fixed to the outer surface of the left side plate 13 across the window 15, and pinion shafts 35 </ b> A and 35 </ b> B are rotatably supported on the support fitting 34. The pinion shafts 35 </ b> A and 35 </ b> B are arranged in the vertical direction, and are arranged on both the left and right sides in FIG. 4 with the shaft center of the bar 104 interposed therebetween. Pinions 36A and 36B are fixed to the upper ends of the pinion shafts 35A and 35B, and the pinion 36A and the pinion 36B are engaged with each other. A lever 37 is formed integrally with one pinion 36B, and the tip of the piston rod 312 of the pneumatic cylinder 31 is connected to the lever 37 by a pin 313.

  Accordingly, when the pneumatic cylinder 31 is operated and the piston rod 312 moves forward, the lever 37 and the pinion 36B rotate counterclockwise (as viewed in FIG. 7). The pinion 36A rotates in the clockwise direction (as viewed in FIG. 7). A roller shaft 38A that is eccentric with respect to the pinion shaft 35A is integrally formed at the lower end of the pinion shaft 35A, and a gripping roller 32A is rotatably supported at the lower end of the roller shaft 38A. Similarly, a roller shaft 38B eccentrically formed with respect to the pinion shaft 35B is integrally formed at the lower end of the pinion shaft 35B, and a gripping roller 32B is rotatably supported at the lower end of the roller shaft 38B. Therefore, when the pneumatic cylinder 31 is operated, the gripping rollers 32A and 32B swing in the direction in which the bar 104 is gripped or released from the axis of the bar 104. The pinion 36A, the pinion 36B, the pinion shafts 35A and 35B, the roller shafts 38A and 38B, etc. constitute a second opening / closing mechanism.

[Fixed-length feed operation of bar cutting machine 100 provided with fixed-size feed device 102]
FIG. 10 is an explanatory diagram showing a constant-size feeding operation of the bar cutting machine 100 provided with the constant-size feeding device 102 of the present invention. As shown in FIG. 10A, the pair of gripping rollers 32 </ b> A and 32 </ b> B of the second bar gripping device 3 releases the bar 104. The first bar holding device 2 is stopped at the original position at the right end in FIG. In this state, the hydraulic cylinder 21 of the first bar holding device 2 is operated, and the outer periphery of the bar 104 is held by the holding claws 22A and 22B. Next, as shown in FIG. 10 (b), the servo motor 6 is operated to move the first bar holding device 2 toward the bar cutting machine 103 (left direction in FIG. 10 (b)) by a predetermined distance. Just move. The tip of the bar 104 comes into contact with the stopper 81 and stops.

  Next, the pneumatic cylinder 31 of the second bar gripping device 3 is operated to grip the outer periphery of the bar 104 with the pair of gripping rollers 32A and 32B. Therefore, the bar 104 is kept in contact with the stopper 81 and stopped. Since the air in the cylinder chamber 54 is compressed and mitigated when the front end surface of the bar 104 comes into contact with the stopper 81, the gripping claws 22A and 22B of the first bar holding device 2 and the bar Slip scratches with the outer peripheral surface 104 are reduced. Next, as shown in FIG. 10 (c), if the movable tooth 83 is lowered with respect to the fixed tooth 82 and the bar 104 is cut, a forging material 84 having a predetermined length is obtained. At the moment when the movable tooth 83 contacts the bar 104, the hydraulic cylinder 21 of the first bar gripping device 2 is operated to open the gripping claws 22A and 22B, and the servo motor 6 is operated to The bar holding device 2 is moved in a direction away from the bar cutting machine 103 (right direction in FIG. 10C), returned to the original position at the right end shown in FIG. 10A and stopped.

Next, the pneumatic cylinder 31 of the second bar holding device 3 is operated to open the pair of holding rollers 32A and 32B and release the bar 104 from being held. In this way, the forging material 84 can be manufactured in a necessary quantity by repeating the steps shown in FIGS. 10 (a) to 10 (c). When the bar 104 comes into contact with the stopper 81 and stops, the fixed-size feeding device 102 of the bar cutting machine 100 of the present invention grips the bar 104 with the gripping rollers 32A and 32B of the second bar gripping device 3. Then, the bar 104 is held at the stop position. The second bar holding device 3 can prevent the material from retreating greatly due to the reaction when the bar 104 is cut. If the material largely recedes due to the reaction at the time of cutting, the feeding amount for the next cutting will be insufficient. As understood from the above description, slip scratches on the outer peripheral surface of the bar 104 are reduced, and product defects and cracks are reduced during precision forging in the subsequent process.
[Other embodiments]
The bar 104 feeding device described above uses the ball screw 5, the ball nut 51, and the servo motor 6. However, a fluid pressure cylinder device capable of digital drive control that is driven by a fluid pressure such as a pneumatic pressure of the feeding device of the bar 104 may be used. Further, in this feeding device, when the bar 104 comes into contact with the stopper 81, the impact is transmitted from the cylinder 53 to the air in the cylinder chamber 54, and the air in the cylinder chamber 54 is compressed to reduce the impact. . As will be understood from this description, instead of the air pressure, the impact buffering means may be a liquid such as a spring or oil.

DESCRIPTION OF SYMBOLS 100 ... Bar material cutting machine 101 provided with fixed dimension feeding apparatus ... Bar material feeding apparatus 102 ... Fixed dimension feeding apparatus 103 ... Bar material cutting machine 104 ... Bar material 1 ... Housing 11 ... Bottom plate 12 ... Bracket 13 ... Left side plate 14 ... Right side plate 15 ... Window 2 ... First bar holding device 21 ... Hydraulic cylinder 211 ... Shaft portion 212 ... Piston rod 213 ... Pins 22A, 22B ... Holding claws 23 ... Support plates 23A, 23B ... Support plates 24A, 24B ... Support Shaft 25A, 25B ... Lever 26A, 26B ... Segment gear 27A, 27B ... Claw holder 271A, 271B ... Pin 272A, 272B ... Flat plate 28A, 28B ... Lever 281A, 282A ... Pin 281B, 282B ... Pin 3 ... Second bar Gripping device 31 ... Pneumatic cylinder 311 ... Shaft 312 ... Piston rod 313 ... Pin 32A, 32B ... Gripping roller 33 ... Mounting bracket 3 Support brackets 35A, 35B ... Pinion shafts 36A, 36B ... Pinion 37 ... Lever 38A, 38B ... Roller shaft 4 ... Guide shaft 41 ... Linear bearing 5 ... Ball screw 51 ... Ball nut 52 ... Piston 53 ... Cylinder 54 ... Cylinder chamber 55 ... Nut 56 ... Connecting plate 6 ... Servo motor 61 ... Output shaft 62 ... Pulley 63 ... Pulley 64 ... Belts 71, 72 ... Guide bush 81 ... Stopper 82 ... Fixed teeth 83 ... Movable teeth 84 ... Forging material

Claims (4)

A housing constituting the main body;
A first bar gripping device provided in the housing, capable of gripping the outer periphery of a bar long in the axial direction with a first gripping member so as to be opened and closed, and guided to be movable in the axial direction;
A first opening / closing mechanism provided in the housing for opening / closing the first gripping member;
A first drive source provided in the housing for driving the first opening / closing mechanism;
A feeding device provided in the housing, for moving the first bar gripping device by a predetermined distance in a direction parallel to the axis of the bar, and feeding the bar;
A stopper for positioning the bar in a predetermined position, in contact with the front end surface of the bar sent by the feeder;
A second bar gripping device provided in the housing, disposed between the first bar gripping device and the stopper, and capable of gripping an outer periphery of the bar with a second gripping member so as to be opened and closed; ,
A second opening / closing mechanism provided on the housing for opening / closing the second gripping member;
A second drive source provided in the housing for driving the second opening and closing mechanism;
A bar cutting machine provided with a fixed-size feeding device that is disposed between the second bar holding device and the stopper and includes a bar cutting machine for cutting the positioned bar. In the bar cutting machine provided with the fixed-size feeder according to claim 1,
The first opening / closing mechanism is a parallel link mechanism that moves the first gripping member in a direction perpendicular to the axis of the bar. Cutting machine. In the bar cutting machine provided with the fixed-size feeder according to claim 1 or 2,
The feed apparatus has an impact buffering means for buffering when the bar material comes into contact with the stopper. A bar cutting machine provided with a fixed-size feed device. In the bar cutting machine provided with the fixed-size feeder according to claim 1 or 2,
The feeding device is
A ball nut provided in the first bar gripping device;
A ball screw rotatably supported on the housing, mounted on the housing and screwed into the ball nut;
A bar cutting machine provided with a fixed-size feeding device, comprising: a servo motor mounted on the housing and connected to the ball screw.

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