Stabilizers, machine tools, and workpiece feeding and processing systems

Abstract

To provide a swing stop device, a machine tool and a workpiece supply working system which can reliably suppress vibrations of a workpiece.SOLUTION: A swing stop device 70 includes : a swing stop pipe 76 which extends from a back end part 10E of a spindle unit 10 toward a back direction, has a shape surrounding an outer circumference of the workpiece W grasped by the spindle unit 10 and suppresses swing of the workpiece W by bringing into contact with the outer circumference surface of the rotating workpiece W; a supporting member 79 which is fixed to the back end part 10E and supports the swing stop pipe 76; a swing stop mechanism 80 which supports a portion of the back side from a portion of the swing stop pipe 76 supported by the supporting member 79; swing stop base 72, slider 77 and connection arm 78 which are sliding-movable along a rail 13R for movement of the spindle unit 10 while supporting the swing stop mechanism 80; and a connection member 73 which connects the spindle unit 10 and the swing stop base 72 so that the swing stop mechanism 80 moves together with the spindle unit 10.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a vibration damping device, a machine tool, and a workpiece supply and processing system.

Background Art

[0002] In the bar processing machine described in Patent Document 1, a bar vibration damping device having a plurality of rollers for gripping the peripheral surface of the bar is fixed to the rear end surface of the main shaft.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the configuration described in Patent Document 1 above, since the bar vibration damping device is supported in a cantilever manner on the rear end surface of the main shaft, vibration is likely to occur on the rear end side of the bar away from the main shaft.

[0005] The present invention has been made in view of the above actual situation, and an object thereof is to provide a vibration damping device, a machine tool, and a workpiece supply and processing system that can more reliably suppress the vibration of a workpiece.

Means for Solving the Problems

[0006] To achieve the above objective, a vibration damping device according to a first aspect of the present invention includes: a vibration damping portion that extends rearward from the rear end of a spindle unit and has a shape that surrounds the outer circumference of a workpiece grasped by the spindle unit, and suppresses the vibration of the workpiece by contacting the outer surface of the workpiece that rotates while being grasped by the spindle unit; a first support portion fixed to the rear end of the spindle unit and supporting the vibration damping portion; a second support portion that supports a portion rearward from the portion of the vibration damping portion supported by the first support portion; a sliding mechanism that supports the second support portion and is configured to move in a direction along the rotation axis of the workpiece by sliding along a rail provided for the movement of the spindle unit; and a connecting member that connects the spindle unit and the second support portion so that the second support portion moves together with the spindle unit.

[0007] To achieve the above objective, a machine tool according to a second aspect of the present invention comprises the steady rest and the spindle unit. To achieve the above objective, a work supply and processing system according to a third aspect of the present invention comprises a machine tool and a work supply device located behind the spindle unit and supplying a work to the spindle unit through the steady rest, wherein the machine tool includes a tool unit having a tool used when processing a work held by the spindle unit, and the work supply device includes a push rod formed in the shape of a rod with a diameter less than or equal to the diameter of the work, capable of feeding the work towards the tip of the spindle unit by pushing the work, and which retracts to exit the steady rest during processing of the work by the tool. [Effects of the Invention]

[0008] According to the present invention, vibrations of the workpiece can be suppressed more reliably. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic front view showing a partially cross-sectional view of a machine tool according to one embodiment of the present invention. [Figure 2]This is a schematic plan view of a machine tool according to one embodiment of the present invention. [Figure 3] This is a schematic side view of a machine tool according to one embodiment of the present invention. [Figure 4] This is a schematic side view of a vibration damping mechanism according to one embodiment of the present invention. [Figure 5] This is a schematic cross-sectional view of a vibration-preventing pipe, pipe support section, and lubrication mechanism, etc., according to one embodiment of the present invention. [Figure 6] (A) is a cross-sectional view of the tip side of a spindle unit according to one embodiment of the present invention, and (B) is a cross-sectional view of the tip side of a spindle unit according to a comparative technology. [Figure 7] (A) is a cross-sectional view of the tip side of a spindle unit according to one embodiment of the present invention, and (B) is a cross-sectional view of the tip side of a spindle unit according to a comparative technology. [Modes for carrying out the invention]

[0010] A stabilizer, machine tool, and workpiece feeding and processing system according to one embodiment of the present invention will be described with reference to the drawings. As shown in Figures 1 and 2, the workpiece supply and processing system 5 comprises a machine tool 1 and a workpiece supply device 50 that supplies workpieces W to the machine tool 1. Machine tool 1 is an NC (Numerical Control) lathe for machining workpiece W. More specifically, machine tool 1 comprises a bed S which is a base that supports each component of machine tool 1, a spindle unit 10, a spindle movement mechanism 13, a guide bushless device 60, a tool unit 30, tool movement mechanisms 32 and 33, a steady rest 70, and a control unit 300. In the following explanation, the X-axis direction is the depth direction, the Y-axis direction is the height direction, and the Z-axis direction is the rotation axis direction of the workpiece W.

[0011] The spindle unit 10 grips a cylindrical workpiece W and rotates the gripped workpiece W around a rotation axis along the Z-axis direction. The spindle unit 10 is configured so that the workpiece W can be inserted from its rear end 10E. The spindle unit 10 comprises a spindle 11 located at the tip of the spindle unit 10 and a headstock 15 that rotatably supports the spindle 11. A motor (not shown) for rotating the spindle 11 is built into the headstock 15.

[0012] Furthermore, as shown in Figure 6(A), the spindle unit 10 includes a collet chuck 11a for gripping the workpiece W, a collet sleeve 11d, and a plurality of stabilizer bushings 11f, 11g. The collet chuck 11a extends in the Z-axis direction, is formed to grip the periphery of the workpiece W, and has a substantially cylindrical shape divided into multiple parts in the circumferential direction. An inclined surface 11k is formed on the outer circumferential surface of the tip side (right side in Figure 6(A)) of the collet chuck 11a. The inclined surface 11k is formed to be inclined radially outward from the collet chuck 11a as it moves toward the tip side of the collet chuck 11a.

[0013] The collet sleeve 11d is cylindrical and located on the outer circumference of the collet chuck 11a. The collet sleeve 11d can move forward and backward in the Z-axis direction by the operation of an air cylinder (not shown). When the collet sleeve 11d moves forward, its tip pushes the inclined surface 11k radially inward, reducing the diameter of the collet chuck 11a. The collet chuck 11a grips the workpiece W by reducing its diameter. Conversely, when the collet sleeve 11d moves backward, the collet chuck 11a opens and no longer grips the workpiece W.

[0014] Multiple stabilizer bushings 11f and 11g are located inside the spindle 11 and are arranged in a line along the Z-axis direction. The stabilizer bushing 11f is located towards the tip of the spindle 11, and the stabilizer bushing 11g is located adjacent to the rear side of the stabilizer bushing 11f. The vibration damper bush 11f is cylindrical and surrounds the outer periphery of the workpiece W grasped by the collet chuck 11a. The inner diameter of the vibration damper bush 11f is substantially the same as the outer diameter of the workpiece W, and the gap between the inner peripheral surface of the vibration damper bush 11f and the outer peripheral surface of the workpiece W is small. The first end portion (the right end portion in FIG. 6(A)) close to the inclined surface 11k of the vibration damper bush 11f is located inside the collet chuck 11a, and the second end portion (the left end portion in FIG. 6(A)) far from the inclined surface 11k of the vibration damper bush 11f is located outside the collet chuck 11a. The vibration damper bush 11f is provided with a flange portion 11t formed in an annular shape on the outer peripheral surface of the vibration damper bush 11f and contacting the rear end surface of the collet chuck 11a. While the flange portion 11t of the vibration damper bush 11f contacts the collet chuck 11a, the rear end surface of the vibration damper bush 11f is in contact with the front end surface of the vibration damper bush 11g. Thereby, the vibration damper bush 11f is in a state of being sandwiched between the collet chuck 11a and the vibration damper bush 11g and becomes immovable in the Z-axis direction. The vibration damper bushes 11f and 11g are located on the same axis as the vibration damper pipe 76 described later. The vibration damper bushes 11f and 11g suppress the vibration of the rotating workpiece W by contacting the outer peripheral surface of the workpiece W.

[0015] The spindle moving mechanism 13 shown in FIG. 1 moves the spindle unit 10 in the Z-axis direction under the control of the control unit 300. The spindle moving mechanism 13 includes a spindle base 13B, a plurality of sliders 13S, a motor 13M, and a ball screw mechanism (not shown). The spindle base 13B is plate-shaped along the X-axis direction and the Z-axis direction. The spindle head 15 is installed on the upper surface of the spindle base 13B. Each slider 13S is fixed to the lower surface of the spindle base 13B and is configured to be slidable along a pair of rails 13R on the bed S. The pair of rails 13R extend parallel to each other along the Z-axis direction. When the motor 13M is driven, a ball screw mechanism (not shown) converts the rotational motion of the motor 13M into linear motion, and the converted linear motion causes the spindle unit 10 and the spindle base 13B to move along the rail 13R via the slider 13S.

[0016] The guide bushless device 60 includes a cylindrical portion 61 located on the outer peripheral side of the spindle 11. A through hole penetrating in the Z-axis direction is formed in the cylindrical portion 61. The tip side of the spindle 11 is configured to be able to pass through the through hole of the cylindrical portion 61.

[0017] The tool unit 30 shown in FIGS. 1 and 2 is used when machining the workpiece W grasped by the spindle unit 10. The tool unit 30 includes a tool table 34, a plurality of tools 31, 37, and a stopper 35.

[0018] The tool moving mechanism 33 moves the tool table 34 in the Y-axis direction under the control of the control unit 300. The tool moving mechanism 32 moves the tool table 34 in the X-axis direction under the control of the control unit 300.

[0019] The tool table 34 is arranged around the workpiece W grasped by the spindle unit 10. Tools 31, 37 and a stopper 35 are mounted on the tool table 34. The plurality of tools 31 and the stopper 35 extend along the X-axis direction and are arranged in the Y-axis direction. Each tool 31 is a fixed tool such as a tool bit. The plurality of tools 37 (see FIG. 1) are hole-opening drills or the like extending along the Z-axis direction and are used for machining the end face of the workpiece W grasped by the spindle unit 10. The stopper 35 has a prismatic shape. As shown in FIG. 7(A), the stopper 35 includes a contact surface 35a that can be in surface contact with the end face of the workpiece W among the four side surfaces of the stopper 35. The contact surface 35a is provided at the same position as the cutting edges of the tools 31 arranged in the Y-axis direction of the stopper 35. The contact surface 35a contacts the end face of the workpiece W pushed out by a push rod 51 (described later) within the collet chuck 11a in an open state. Thereby, the pushing amount (length) of the workpiece W is determined.

[0020] The workpiece feeding device 50 is located behind the spindle unit 10 and the stabilizer 70. The workpiece feeding device 50 includes a push rod 51 and a power source (not shown) for moving the push rod 51 along its axial direction (Z-axis direction). The push rod 51 is cylindrical and is located coaxially with the rotation axis of the workpiece W. The push rod 51 has a diameter slightly smaller than the diameter of the workpiece W, and with the end faces of the push rod 51 and the workpiece W in contact, the push rod 51 pushes the workpiece W toward the tip of the spindle 11. The movable range of the push rod 51 is set to the range between position P1 (see Figure 1) and position P2 (see Figure 7(A)). Position P1 is located outside the rear side of the stabilizer pipe 76. Position P2 is located at the tip of the spindle 11.

[0021] The stabilizer 70 shown in Figures 1 and 2 is located behind the spindle unit 10 and supports the workpiece W. The vibration damping device 70 comprises a vibration damping base 72, a pair of sliders 77, a pair of connecting members 73, a vibration damping pipe 76, a pair of connecting arms 78, a support member 79, a lubrication mechanism 74, and a vibration damping mechanism 80. The support member 79 comprises a sleeve 79a, a pipe support portion 79b, and a sleeve support portion 79c. Note that while Figure 1 shows a partial cross-section, some hatching has been omitted for the sake of readability.

[0022] The stabilizer base 72 is plate-shaped, extending along the X-axis and Z-axis directions, and more specifically, it is a rectangular plate shape that is elongated in the X-axis direction. Each slider 77 is fixed to the underside of the headstock base 13B and is configured to slide along a pair of rails 13R on the bed S.

[0023] The pair of connecting members 73 are members that connect the stabilizer base 72 and the headstock base 13B. The pair of connecting members 73 are rectangular plates that extend in the Z-axis direction parallel to each other. Both ends of each connecting member 73 in the Z-axis direction are located on the X-axis end of the upper surface of each base 13B, 72 and are fixed to each base 13B, 72 by bolts 73b. As shown in Figure 2, the width (length in the X-axis direction) of the connecting member 73 is smaller on the stabilizer base 72 side than on the headstock base 13B side.

[0024] The pair of connecting arms 78 are members that support the anti-vibration mechanism 80 relative to the anti-vibration base 72 at a position behind the anti-vibration base 72. The pair of connecting arms 78 extend parallel to each other in the Z-axis direction and extend from the upper surface of the anti-vibration base 72 toward the rear (towards the workpiece supply device 50). The pair of connecting arms 78 are located within the region between the pair of connecting members 73 in the X-axis direction. Each connecting arm 78 includes a base fixing portion 78a and a vibration-preventing fixing portion 78b. The base fixing portion 78a is a rectangular plate shape that is long in the Z-axis direction and is fixed to the upper surface of the vibration-preventing base 72 by bolts 78c. The vibration-preventing fixing portion 78b is formed so that its height in the Y-axis direction increases towards the rear. The vibration-preventing fixing portion 78b is fixed to both sides of the vibration-preventing mechanism 80 by bolts 78d.

[0025] The vibration-retaining pipe 76 is cylindrical and extends coaxially with the workpiece W, suppressing vibration of the workpiece W located inside the vibration-retaining pipe 76. The vibration-retaining pipe 76 is configured to extend from the rear end 10E of the spindle unit 10 toward the workpiece supply device 50. The first end 76a of the vibration-retaining pipe 76 in the Z-axis direction is located opposite to the rear end 10E of the spindle unit 10, as shown in an enlarged view in Figure 1, and the second end 76b of the vibration-retaining pipe 76 in the Z-axis direction is located opposite the push rod 51 at position P1. The inner diameter of the vibration-retaining pipe 76 is approximately the same as the outer diameter of the workpiece W, and the gap between the inner circumferential surface of the vibration-retaining pipe 76 and the outer circumferential surface of the workpiece W is small.

[0026] The sleeve support portion 79c is fixed to the rear end face of the spindle unit 10 and is ring-shaped, surrounding the outer circumference of the first end portion 76a of the stabilizer pipe 76. The sleeve support portion 79c supports the first end portion of the sleeve 79a (the end portion on the spindle unit 10 side). As shown in Figure 5, the sleeve 79a is cylindrical in shape, surrounding the outer circumference of the bracing pipe 76 with a gap Sp. The second end portion 79e of the sleeve 79a, which is closer to the bracing mechanism 80, is thicker than the main body of the sleeve 79a and is located on the outer circumference.

[0027] The pipe support portion 79b is cylindrical in shape and surrounds the outer circumference of the vibration-preventing pipe 76. The inner surface of the pipe support portion 79b contacts the outer surface of the vibration-preventing pipe 76, thereby supporting the vibration-preventing pipe 76. The pipe support portion 79b is located approximately midway between the rear end portion 10E of the spindle unit 10 and the vibration-preventing mechanism 80. The pipe support portion 79b is provided with a flange portion 79f formed in an annular shape on the outer circumferential surface of the pipe support portion 79b. The flange portion 79f is fixed to the second end portion 79e of the sleeve 79a by a bolt 79d while the flange portion 79f is in contact with the end face of the second end portion 79e of the sleeve 79a.

[0028] Lubrication holes 75a, 75b, and 75c are formed in the bracing pipe 76, the pipe support portion 79b, and the second end portion 79e, respectively, penetrating radially through the workpiece W. The lubrication holes 75a, 75b, and 75c are formed to communicate from the outer circumferential surface of the second end portion 79e to the inner circumferential surface of the bracing pipe 76. The diameter of the lubrication hole 75a formed in the second end portion 79e is larger than the diameter of the lubrication hole 75c formed in the bracing pipe 76. The diameter of the lubrication hole 75b formed in the pipe support portion 79b is the same as the diameter of the lubrication hole 75c from the inner circumferential surface of the pipe support portion 79b to partway to the outer circumferential surface, and then gradually increases from partway through the pipe support portion 79b to the outer circumferential surface of the pipe support portion 79b. Finally, the diameter of the lubrication hole 75b becomes the same as the diameter of the lubrication hole 75a at the outer circumferential surface of the pipe support portion 79b.

[0029] The lubrication mechanism 74 shown in Figure 5 smooths the rotation of the workpiece W within the vibration-preventing pipe 76 by supplying lubricating oil into the vibration-preventing pipe 76 through the lubrication holes 75a, 75b, and 75c. The refueling mechanism 74 includes a connecting plug 74a having a nozzle 74n, a connecting member 74b, a refueling pipe 74c, and an oil supply source (not shown). The connecting member 74b is formed in a substantially cylindrical shape and is connected to the second end 79e by screwing it into the oil supply hole 75a from the outside of the second end 79e. The connecting plug 74a is connected to the connecting member 74b by screwing it into the connecting member 74b. With the connecting plug 74a connected to the connecting member 74b, the tip of the nozzle 74n is located inside the oil supply hole 75a, and lubricating oil is discharged from this tip. The discharged lubricating oil is supplied into the vibration-preventing pipe 76 through the oil supply holes 75a, 75b, and 75c. The oil supply pipe 74c is an oil supply passage for sending lubricating oil from an oil supply source (not shown) to the nozzle 74n. The oil supply source (not shown) intermittently discharges lubricating oil from the nozzle 74n via the oil supply pipe 74c under the control of the control unit 300.

[0030] The anti-vibration mechanism 80 supports the anti-vibration pipe 76 behind the pipe support portion 79b. As shown in Figures 3 and 4, the anti-vibration mechanism 80 comprises an adjustment plate 81, pipe retaining members 82 and 83, adjustment screws 84a and 84b, a pair of columnar sections 85a and 85b, and a connecting plate section 86.

[0031] The pair of columnar sections 85a and 85b extend along the Y-axis so as to be parallel to each other. The columnar sections 85a and 85b form a prismatic shape. The adjustment plate 81, the connecting plate portion 86, and the pipe holding members 82 and 83 are plate-shaped and extend along the X-axis and Y-axis directions, respectively, and are formed between a pair of column portions 85a and 85b. The connecting plate portion 86 is located on the upper part of the column portions 85a and 85b, contacts the rear side surface of the column portions 85a and 85b, and is fixed to the column portions 85a and 85b by bolts 86b.

[0032] The pipe retaining members 82 and 83 are located between the connecting plate portion 86 and the adjustment plate 81 in the Y-axis direction, contact the front side surfaces of the column portions 85a and 85b, and are attached to the column portions 85a and 85b by bolts 82b and 83b. The pipe retaining members 82 and 83 support the bracing pipe 76 by clamping it from the Y-axis direction. The pipe retaining members 82 and 83 are provided with notches 82a and 83a that face each other in the Y-axis direction. When viewed from the Z-axis direction, the notches 82a and 83a form approximately isosceles triangular recesses that are opposite to each other in the Y-axis direction. The bracing pipe 76 is clamped between the notches 82a and 83a.

[0033] The adjustment plate 81 is located at the bottom of the column sections 85a and 85b, contacts the front side surface of the column sections 85a and 85b, and is fixed to the column sections 85a and 85b by bolts 81c. The adjustment plate 81 has screw holes 81a and 81b that penetrate in the Y-axis direction. Screw hole 81a is located closer to the column section 85a of the adjustment plate 81, and screw hole 81b is located closer to the column section 85b of the adjustment plate 81.

[0034] The screw shafts of the adjustment screws 84a and 84b are fitted into the screw holes 81a and 81b, and the tips of each screw shaft contact the lower side surface of the pipe retaining member 83. By rotating either or both of the adjustment screws 84a and 84b, the center position of the pipe retaining member 83, and consequently the vibration-preventing pipe 76, can be adjusted. This adjustment allows the center position of the vibration-preventing pipe 76 to be aligned with the rotation axis of the workpiece W (the central axis of the spindle 11). In the aforementioned vibration damping device 70, the vibration damping pipe 76 extending from the rear end of the spindle unit 10 is supported by a pipe support portion 79b and a vibration damping mechanism 80 located in the Z-axis direction. Specifically, when the total length of the vibration damping pipe 76 is divided into three equal parts, the pipe support portion 79b is located at a distance of approximately one-third of the total length from the first end portion 76a, and the vibration damping mechanism 80 is located at a distance of approximately one-third of the total length from the second end portion 76b. This ensures that the vibration damping pipe 76 is supported in a balanced manner, suppressing vibration of the workpiece W inside the vibration damping pipe 76 during the rotation of the workpiece W.

[0035] The control unit 300 controls the operation of each part of the machine tool 1. The control unit 300 consists of a CPU (Central Processing Unit), memory, etc. The control unit 300 executes machining processes according to a preset NC program.

[0036] Next, we will explain the machining process for processing the workpiece W. First, the control unit 300 moves the spindle unit 10 back by the length of the workpiece W via the spindle movement mechanism 13. This product length is the length of the workpiece W after it has been cut off by the parting-off process described later. Then, via the tool movement mechanisms 32 and 33, the stopper 35 is moved along with the tool rest 34 onto the rotation axis of the workpiece W, so that the contact surface 35a of the stopper 35 faces the end face of the workpiece W. Next, after opening the collet chuck 11a, the push rod 51 is advanced and enters the stabilizer pipe 76, pushing the workpiece W to a position where it contacts the stopper 35. Then, the collet chuck 11a is closed to grip the workpiece W. As a result, a portion of the workpiece W longer than the product length is exposed from the spindle 11. Then, the push rod 51 is retracted and taken out of the stabilizer pipe 76, and the spindle unit 10 is advanced via the spindle movement mechanism 13, and machining is performed using the tool unit 30. After this machining, the workpiece W is cut using a parting tool from among the multiple tools 31, and the separated workpiece product is discharged forward. This discharged product is transported to the outside of the device using a workpiece discharge device such as a chute and workpiece conveyor (not shown). This completes the machining process. This machining process can be repeated, and each time it is performed, the length of the workpiece W inside the spindle unit 10 decreases by the length of the product. Note that this processing procedure is just one example, and the order of the processes can be changed or performed simultaneously as appropriate.

[0037] (effect) According to the embodiment described above, the following effects are achieved. (1) The vibration damping device 70 extends rearward from the rear end 10E of the spindle unit 10 and has a shape that surrounds the outer circumference of the workpiece W held by the spindle unit 10. It includes a vibration damping pipe 76, which is an example of a vibration damping part that suppresses the vibration of the workpiece W by contacting the outer surface of the workpiece W as it rotates while being held by the spindle unit 10, a support member 79, which is an example of a first support part that is fixed to the rear end 10E of the spindle unit 10 and supports the vibration damping pipe 76, and the vibration damping pipe 76 supported by the support member 79. The system includes a sway bracing mechanism 80, which is an example of a second support part that supports a part behind the part; a sway bracing base 72, a slider 77, and a connecting arm 78, which are an example of a sliding mechanism configured to move in the Z-axis direction along the rotation axis of the workpiece W by sliding along a rail 13R provided for the movement of the spindle unit 10 while supporting the sway bracing mechanism 80; and a connecting member 73 that connects the spindle unit 10 and the sway bracing base 72 so that the sway bracing mechanism 80 moves together with the spindle unit 10. This configuration produces the following effects (a) to (d). (a) Since the vibration-preventing pipe 76 is supported at two points by the support member 79 and the vibration-preventing mechanism 80, the vibration-preventing pipe 76 is supported more stably than the configuration in which the vibration-preventing pipe is cantilevered at the rear end of the spindle unit described in Patent Document 1, and vibrations of the workpiece W can be suppressed by the vibration-preventing pipe 76. (b) Since the inner surface of the vibration-preventing pipe 76 is in contact with the outer surface of the workpiece W, there is little gap between the vibration-preventing pipe 76 and the workpiece W, and vibration of the workpiece W can be suppressed. (c) Since the first end 76a of the vibration damping pipe 76 is located near the rear end 10E of the spindle unit 10, the area between the vibration damping pipe 76 and the spindle unit 10 that does not support the workpiece W is reduced, and vibration of the workpiece W can be suppressed. (d) The connecting member 73 causes the spindle unit 10 and the stabilizer base 72 to move in conjunction, so the positional relationship (distance) of the stabilizer mechanism 80 with respect to the spindle unit 10 can be kept constant. Therefore, regardless of the position of the spindle unit 10, the stabilizer pipe 76 is stably supported by the stabilizer mechanism 80, and vibration of the workpiece W can be suppressed. In addition, there is no need to provide a separate configuration for moving the stabilizer mechanism 80, so the configuration can be simplified. As shown in (a) to (d) above, the vibration suppression effect of the workpiece W can be greatly increased with a simple configuration.

[0038] (2) The vibration damping device 70 is equipped with a lubrication mechanism 74 that supplies lubricating oil into the vibration damping pipe 76. With this configuration, the friction of the workpiece W rotating within the stabilizer pipe 76 can be reduced by supplying lubricating oil, thereby suppressing the occurrence of seizure of the workpiece W due to frictional heat within the stabilizer pipe 76. In addition, friction of the workpiece W when it is advanced within the stabilizer pipe 76 can be reduced, allowing for smoother movement of the workpiece W.

[0039] (3) The vibration suppression mechanism 80 includes an adjustment plate 81, adjustment screws 84a, 84b and a pipe retaining member 83, which are examples of an adjustment mechanism configured to allow the position of the vibration suppression pipe 76 to be adjusted so that the center position of the supporting vibration suppression pipe 76 coincides with the rotation axis of the workpiece W. With this configuration, the vibration of the workpiece W can be suppressed by aligning the center position of the vibration-preventing pipe 76 with the rotation axis of the workpiece W.

[0040] (4) The machine tool 1 comprises a steady rest 70 and a spindle unit 10. With this configuration, the machine tool 1 can achieve the effects of (a) to (d) described in (1) above.

[0041] (5) The work supply and processing system 5 comprises a machine tool 1 and a work supply device 50 located behind the spindle unit 10, which supplies the workpiece W to the spindle unit 10 through a steady pipe 76. The machine tool 1 comprises a tool unit 30 having tools 31 and 37 used when processing the workpiece W held by the spindle unit 10. The work supply device 50 is formed in the shape of a rod with a diameter less than or equal to the diameter of the workpiece W, and is capable of feeding the workpiece W to the front end of the spindle unit 30 by pushing the workpiece W, and includes a push rod 51 that retracts so as to be outside the steady pipe 76 while the workpiece W is being processed by the tools 31 and 37. This configuration produces the following effects (a) to (c). (a) In this embodiment, since the push rod 51 does not have a finger chuck for gripping the workpiece W, the amount of leftover workpiece W can be reduced. The following will be explained in detail, comparing this embodiment with comparable technologies. In the comparative technology shown in Figure 7(B), the finger chuck 152 located at the end of the push rod 151 grips the end of the workpiece W from the outer circumference, causing the finger chuck 152 to interfere with the tip of the collet chuck 11a. As a result, there is a limit to the forward position of the finger chuck 152, and the length L1 of the remaining material of the workpiece W is increased. On the other hand, in this embodiment, as shown in Figure 7(A), the tip of the push rod 51 does not interfere with the collet chuck 11a and can reach the tip of the collet chuck 11a, making the length L2 of the remaining workpiece W shorter than the length L1. Therefore, waste of workpiece W can be reduced. (i) In this embodiment, since the push rod 51 does not have a finger chuck for gripping the workpiece W, the gap between the sway-retaining bushings 11f, 11g of the spindle unit 10 and the workpiece W can be reduced, thereby suppressing the runout of the workpiece W. The following will be a detailed explanation of this embodiment and comparative technologies. In the comparative technologies shown in Figures 6(B) and 7(B), the finger chuck 152 grips the end of the workpiece W (workpiece W having the same outer diameter as the workpiece outer diameter in Figures 6(A) and 7(A)) from the outer circumference, so the outer diameter of the finger chuck 152 is larger than the outer diameter of the workpiece W. In addition, in this comparative technology, in order to allow the finger chuck 152 to enter the stabilizer bushings 111f and 111g, the inner diameter of the stabilizer bushings 111f and 111g must be formed to be larger than the outer diameter of the finger chuck 152. As in this comparative technology, when the inner diameter of the stabilizer bushings 111f and 111g is large, a gap Sk is formed between the inner surface of the stabilizer bushings 111f and 111g and the outer surface of the workpiece W, and this gap Sk causes runout of the workpiece W. In Figure 6(B) of the comparative technology, the finger chuck 152 is shown in a forward position. In particular, when the finger chuck 152 is located behind the steady-resist pipe 76, the runout of the workpiece W due to the gap Sk increases, and the machining accuracy decreases. On the other hand, in this embodiment, as shown in Figure 6(A), since the push rod 51 does not have a finger chuck for gripping the workpiece W, the inner diameter of the stabilizer bushings 11f, 11g can be matched to the outer diameter of the workpiece W, and the gap between the stabilizer bushings 11f, 11g and the workpiece W can be reduced. This makes it possible to suppress the runout of the workpiece W. (c) In this embodiment, the push rod 51 retracts so as to be outside the vibration restraint pipe 76 during machining of the workpiece W. Therefore, the workpiece W is not affected by the push rod 51 during machining, and the reduction in machining accuracy caused by the push rod 51 is suppressed. On the other hand, in configurations with a finger chuck 152, as shown in the comparative technologies in Figures 6(B) and 7(B), the finger chuck 152 grips the workpiece W even while the workpiece W is being machined, so the push rod 151 cannot retract to exit the steady rest pipe 76. Furthermore, since the finger chuck 152 rotates together with the workpiece W while the workpiece W is being machined, this may lead to a decrease in machining accuracy.

[0042] (modified version) However, the present invention is not limited by the embodiments and drawings described above. Modifications (including the deletion of components) can be made as appropriate without altering the essence of the invention. An example of a modification is described below.

[0043] In the above embodiment, the number of spindle units 10 is not limited to one, but may be two or more. For example, a second spindle unit may be provided separately from the spindle unit 10 (first spindle unit). The second spindle unit may receive a workpiece from the first spindle unit, move in the X-axis direction and the Z-axis direction to perform machining using the tool unit 30 or a tool unit other than the tool unit 30, and then discharge the machined workpiece to a discharge section such as a chute.

[0044] The oil supply source (not shown) may not only discharge lubricating oil intermittently, but may also discharge lubricating oil continuously. Furthermore, the oil supply source (not shown) may supply air mixed with lubricating oil (oil-air). Multiple lubrication mechanisms 74 may be provided, and lubricating oil may be supplied into the anti-vibration pipe 76 from multiple locations arranged in the longitudinal and / or circumferential directions of the anti-vibration pipe 76. Lubricating oil may be supplied to the slider 13S, 77 or the ball screw mechanism of the spindle movement mechanism 13. The refueling mechanism 74 may be omitted.

[0045] The length of the rail 13R is not limited to the above embodiment; it may be longer or shorter than that of the above embodiment. The anti-vibration pipe 76 was supported at two points, by the anti-vibration mechanism 80 and the pipe support portion 79b, but it may be supported at three or more points. For example, a new support portion for supporting the anti-vibration pipe 76 may be provided on the anti-vibration base 72, or the support member 79 or the anti-vibration mechanism 80 may support the anti-vibration pipe 76 at multiple points. This makes it possible to stably support even long workpieces W. The configuration of the tool stand 34, as well as the arrangement and types of tools 31 and 37, can be changed as appropriate. The adjustment plate 81 and adjustment screws 84a and 84b were originally located at the bottom of the anti-vibration mechanism 80, but they may also be located at the top of the anti-vibration mechanism 80, with the pipe retaining member 82 being pressed by the adjustment screws 84a and 84b. Furthermore, the center position of the anti-vibration pipe 76 may be adjusted using components other than the adjustment plate 81 and adjustment screws 84a and 84b. Furthermore, the adjustment plate 81 and the adjustment screws 84a and 84b may be omitted. The vibration damping mechanism 80 may be configured to press the vibration damping pipe 76 from all sides with multiple rollers. The connecting member 73 and the connecting arm 78 may be integrally formed. One end of the connecting member 73 was fixed to the headstock base 13B, but it is not limited to this, and may be fixed to the headstock 15 or the support member 79. The other end of the connecting member 73 was fixed to the sway stabilizer base 72, but it is not limited to this, and may be fixed to the sway stabilizer mechanism 80 or the connecting arm 78. The sway-preventing mechanism 80 and the spindle unit 10 were configured to be movable using a common rail 13R, but they are not limited to this configuration; they may also be configured to be movable using separate rails. The outer shape of the anti-vibration pipe 76 was circular, but it may be formed in a shape other than a circle. [Explanation of symbols]

[0046] 1...Machine tool, 5...Workpiece feeding and machining system, 10...Spindle unit, 10E...Rear end, 11...Spindle, 11a...Collet chuck, 11d...Collet sleeve, 11f, 11g, 111f, 111g...Resistance bush, 11k...Inclined surface, 11t...Flange, 13...Spindle movement mechanism, 13B...Headstock base, 13M...Motor, 13R...Rail, 13S, 77...Slider 15...Headstock, 30...Tool unit, 31,37...Tool, 32,33...Tool moving mechanism, 34...Tool stand, 35...Stopper, 35a...Contact surface, 50...Workpiece feeding device, 51,151...Push rod, 60...Guide bushless device, 61...Cylindrical section, 70...Stabilizer, 72...Stabilizer base, 73...Connecting member, 73b,78c,78d,79d,81c,82b,83b,86 b...bolt, 74...lubrication mechanism, 74a...connecting plug, 74b...connecting member, 74c...lubrication pipe, 74n...nozzle, 75a, 75b, 75c...lubrication hole, 76...anti-vibration pipe, 76a...first end, 76b...second end, 78...connecting arm, 78a...base fixing part, 78b...anti-vibration fixing part, 79...support member, 79a...sleeve, 79b...pipe support part, 79c...sleeve support 79e…Second end, 79f…Flange, 80…Anti-vibration mechanism, 81…Adjustment plate, 81a,81b…Screw holes, 82,83…Pipe retaining members, 82a,83a…Notches, 84a,84b…Adjustment screws, 85a,85b…Column, 86…Connecting plate, 152…Finger chuck, 300…Control unit, P1,P2…Position, S…Bed, W…Workpiece, Sk,Sp…Gap

Claims

1. A steady rest portion extends from the rear end of the spindle unit toward the rear, has a shape that surrounds the outer circumference of the workpiece held by the spindle unit, and suppresses runout of the workpiece by contacting the outer surface of the workpiece that rotates while being held by the spindle unit, A first support portion is fixed to the rear end of the main spindle unit and supports the stabilizing portion, A second support portion that supports the portion of the anti-vibration portion located behind the portion of the anti-vibration portion supported by the first support portion, A sliding mechanism is configured to support the second support portion and to move in a direction along the rotation axis of the workpiece by sliding along a rail provided for the movement of the spindle unit, The device includes a connecting member that connects the spindle unit and the second support portion so that the second support portion moves together with the spindle unit. Stabilizer.

2. The system includes a lubrication mechanism that supplies lubricating oil into the vibration-preventing section. The vibration damping device according to claim 1.

3. The second support portion includes an adjustment mechanism configured to adjust the position of the stabilizer portion so that the center position of the stabilizer portion it supports coincides with the rotation axis of the workpiece. The vibration damping device according to claim 1 or 2.

4. A vibration damping device according to claim 1 or 2, The spindle unit comprises the above-mentioned, Machine tools.

5. The machine tool described in claim 4, The system includes a workpiece supply device located behind the spindle unit, which supplies workpieces to the spindle unit through the sway stabilizer, The machine tool comprises a tool unit having a tool used when machining a workpiece held by the spindle unit, The workpiece feeding device is formed in the shape of a rod with a diameter less than or equal to the diameter of the workpiece, and is capable of feeding the workpiece to the tip side of the spindle unit by pushing the workpiece, and includes a push rod that retracts so as to be outside the steady rest during machining of the workpiece by the tool. Workpiece feeding and processing system.

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