Vibration suppression device, machine tool, and workpiece supply processing system

Abstract

To provide a vibration suppression device which can deal with vibration suppression of workpieces having various cross sectional shapes, and to provide a machine tool and a workpiece supply processing system.SOLUTION: The invention relates to a vibration suppression device 70 of a workpiece W to be processed in a machine tool 1. The vibration suppression device 70 includes: a vibration suppression pipe 90 which is connected to an end of a spindle 11 which rotates the workpiece W around an axis and rotates around the axis with the spindle 11; vibration suppression bushes 20, 21 provided at the inside of the vibration suppression pipe 90 and the inside of the spindle 11, formed with holding holes each of which corresponds to a cross sectional shape of the workpiece W, and configured to hold the workpiece W inserted into the holding holes; and a bearing 83 which rotatably supports the vibration suppression pipe 90 at a position spaced away from a connected portion with the spindle 11.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a steady rest device, a machine tool, and a workpiece supply and machining system. [Background technology]

[0002] Conventionally, when a workpiece (raw material, bar stock) longer than the spindle is supplied to a machine tool, a steady rest device is attached to suppress the workpiece from vibrating. For example, Patent Document 1 discloses a machine tool in which a steady rest device is connected to the spindle via a connecting member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-69627 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the technology disclosed in Patent Document 1 discloses a configuration for suppressing the steadying of a workpiece having a circular cross section, and it is difficult to accommodate the steadying of a workpiece having a shape other than a circle.

[0005] The present invention has been made in response to these problems, and aims to provide a steady rest device, machine tool, and work supply and processing system that can accommodate the steady rest of workpieces with various cross-sectional shapes. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the anti-vibration device of the present invention is a anti-vibration device for a workpiece to be machined by a machine tool, and comprises: an anti-vibration pipe connected to the end of a spindle that rotates the workpiece about its axis and rotates together with the spindle; an anti-vibration bushing provided inside the anti-vibration pipe and inside the spindle, having a retaining hole formed therein that corresponds to the cross-sectional shape of the workpiece and that holds the workpiece inserted into the retaining hole; and a bearing that rotatably supports the anti-vibration pipe at a position away from the connection point with the spindle.

[0007] In order to achieve the above object, a machine tool according to the present invention includes a spindle unit having the above-described spindle and rotating the spindle about its axis, and the above-described steady rest device.

[0008] In order to achieve the above object, the work supply processing system of the present invention comprises the above machine tool and a work supply device located at the rear of the machine tool and supplying the work to the spindle unit through the anti-vibration pipe, the work supply device having a push rod that can move back and forth relative to the work, and the push rod pushes the end face of the work to send the work toward the tip of the spindle unit by moving forward, and moves away from the work by moving backward. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a steady rest device, a machine tool, and a workpiece supply and processing system that can accommodate steadying of workpieces with various cross-sectional shapes. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a front view showing a part of a machine tool in cross section according to an embodiment of the present invention; [Figure 2] 1 is a plan view of a machine tool according to an embodiment of the present invention; [Figure 3] FIG. 2 is an enlarged view of the machine tool in the portion “III” in FIG. 1. [Figure 4] FIG. 2 is an enlarged view of the machine tool at the portion “IV” in FIG. [Figure 5]4A is a cross-sectional view of the machine tool taken along the section line Va-Va in FIG. 3, and FIG. 4B is a cross-sectional view of the machine tool taken along the section line Vb-Vb in FIG. [Figure 6] 1 is a side view of a machine tool according to an embodiment of the present invention. [Figure 7] FIG. 2A is a cross-sectional view of the tip end side of a spindle unit according to an embodiment of the present invention, and FIG. 2B is a cross-sectional view of the tip end side of a spindle unit according to a comparative technique. [Figure 8] FIG. 2A is a cross-sectional view of the tip end side of a spindle unit according to an embodiment of the present invention, and FIG. 2B is a cross-sectional view of the tip end side of a spindle unit according to a comparative technique. DETAILED DESCRIPTION OF THE INVENTION

[0011] A steady rest device, machine tool, and workpiece supply and machining system according to an embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, an X-axis and a Z-axis are defined that are orthogonal to each other in the horizontal direction, and a Y-axis extends in the height direction. Here, the Z-axis is parallel to the rotation axis of the workpiece W. In the following description, the XYZ coordinate axes defined in this manner will be referred to as appropriate. Furthermore, the +Z direction (to the right in FIG. 1) is defined as the front of the machine tool 1, and the -Z direction (to the left in FIG. 1) is defined as the rear of the machine tool 1.

[0012] As shown in FIGS. 1 and 2, the workpiece supplying and processing system 5 includes a machine tool 1 provided on a floor 200, and a workpiece supplying device 50 that supplies a workpiece W to the machine tool 1.

[0013] The machine tool 1 is, for example, an NC (Numerical Control) lathe that machines a workpiece W. The machine tool 1 includes a bed S that supports each component of the 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 device 70, and a control unit 300.

[0014] The spindle unit 10 grips a workpiece W, for example, as shown in FIGS. 5(a) and 5(b). A cross section of the workpiece W cut in a direction perpendicular to its axis is I-shaped (rectangular). As shown in FIG. 1, the spindle unit 10 includes a spindle 11 that rotates the workpiece W housed therein about its axis, bearings 16 and 17 that rotatably support the spindle 11, and a headstock 15 on which the bearings 16 and 17 are provided. A motor 18 that rotates the spindle 11 about its axis is built into the headstock 15. Furthermore, as shown in FIG. 3, the spindle unit 10 includes a collet chuck 11a that grips the workpiece W, a collet sleeve 11d, and steady-stop bushings 20 and 21.

[0015] The collet chuck 11a has a gripping portion that matches the shape of the workpiece W and is generally cylindrical and divided into multiple sections in the circumferential direction. An inclined surface 11k is formed on the outer peripheral surface of the tip side (+Z side) of the collet chuck 11a. The inclined surface 11k is formed so as to slope radially outward from the collet chuck 11a as it advances toward the tip side of the collet chuck 11a. The collet chuck 11a is attached to the spindle 11 via a chuck nut 11h.

[0016] The collet sleeve 11d is cylindrical and is located on the outer periphery of the collet chuck 11a. The collet sleeve 11d can be advanced and retreated in the Z-axis direction by the operation of an air cylinder (not shown). When the collet sleeve 11d advances, the tip of the collet sleeve 11d presses the inclined surface 11k radially inward, causing the collet chuck 11a to contract in diameter. When the collet chuck 11a contracts in diameter, it grips the workpiece W. Conversely, when the collet sleeve 11d retreats, the collet chuck 11a opens and no longer grips the workpiece W.

[0017] The anti-vibration bushings 20, 21 are housed within the hollow portion of the spindle 11 and are arranged side by side in the Z-axis direction. The anti-vibration bushing 20 is arranged at the very tip of the spindle 11. On the other hand, the anti-vibration bushing 21 is arranged adjacent to the anti-vibration bushing 20 on the -Z side (rear side) thereof. The anti-vibration bushings 21 are arranged not only within the hollow portion of the spindle 11 but also inside an anti-vibration pipe 90 (described later) connected to the spindle 11. In the entire machine tool 1, twelve anti-vibration bushings 21 and one anti-vibration bushing 20 are arranged in a row in the Z-axis direction.

[0018] 5(a), the anti-vibration bushing 21 has a circular cross section when cut in a direction perpendicular to the Z axis. At the center of the cross section of the anti-vibration bushing 21, a circular hollow hole 21a that penetrates in the Z axis direction and a rectangular hollow hole 21b that also penetrates in the Z axis direction are formed with their centers aligned.

[0019] The circular hollow hole 21a is a hole through which a push rod 51 (FIG. 1) having a circular cross section, which will be described later, passes. On the other hand, the rectangular hollow hole 21b is a holding hole formed to hold a workpiece having an I-shaped (rectangular) cross section, and is formed so that there is a small gap between the circular hollow hole 21a and the outer peripheral surface of the I-shaped workpiece. The diameter D of the circular hollow hole 21a is slightly larger than the diameter of the push rod 51, so that the push rod 51 can be supported without swinging. The diameter D of the circular hollow hole 21a is smaller than the length of the long side L1 of the rectangular hollow hole 21b and larger than the length of the short side L2. In other words, the rectangular hollow hole 21b is formed so as to divide the circular hollow hole 21a.

[0020] The +Z side (front side) end of the anti-vibration bushing 21 is located within the collet sleeve 11d, as shown in Fig. 3. A groove 21f extending in the circumferential direction is formed on the outer surface of the anti-vibration bushing 21. An O-ring 22 is housed in this groove 21f. The O-ring 22 seals the gap between the outer peripheral surface of the anti-vibration bushing 21 and the inner peripheral surface of the collet sleeve 11d, where a small gap is provided.

[0021] Like the anti-vibration bushing 21, the anti-vibration bushing 20 is a cylinder with a circular hollow hole 21a and a rectangular hollow hole 21b, and its outer diameter is smaller than that of the anti-vibration bushing 21. The anti-vibration bushing 20 is provided on the same axis as the anti-vibration bushing 21 and an anti-vibration pipe 90 described below, and together with the anti-vibration bushing 21, it suppresses vibration of the workpiece W during machining.

[0022] The +Z side (front side) end of the steady-stop bushing 20 is located inside the collet chuck 11a, and the -Z side (rear side) end is located outside the collet chuck 11a. An annular flange 11t is formed on the outer peripheral surface of the steady-stop bushing 20, which contacts the rear end surface of the collet chuck 11a. A spring 25 is interposed between this flange 11t and a step 11m formed on the inner peripheral surface of the collet sleeve 11d. The steady-stop bushing 20 is positioned such that its rear end surface contacts the front end surface of the steady-stop bushing 21, while receiving force from the spring 25 and pressing the rear end surface of the collet chuck 11a with the flange 11t. As a result, the steady-stop bushing 20 is sandwiched between the collet chuck 11a and the steady-stop bushing 21, and is unable to move in the Z-axis direction.

[0023] Furthermore, as shown in FIGS. 3 and 5(a), pin insertion holes 20e, 21e are formed in the end faces of the anti-vibration bushings 20, 21 in the Z-axis direction. The pin insertion holes 20e, 21e formed in the anti-vibration bushings 20, 21 are arranged in the same manner, so their arrangement will be described using the pin insertion hole 21e as an example. As shown in FIG. 5(a), two pin insertion holes 21e are formed in the end face of the anti-vibration bushing 21. The two pin insertion holes 21e are arranged on an imaginary circle C, the center of which is aligned with the center of the cross section of the anti-vibration bushing 21, with a central angle of approximately 60 degrees between them. The number and positions of the pin insertion holes 20e, 21e are not limited to those of the present embodiment. As shown in FIG. 3, a pin 23 is inserted into adjacent pin insertion holes 20e, 21e, thereby connecting the adjacent anti-vibration bushings 20, 21.

[0024] The spindle moving mechanism 13 moves the spindle unit 10 in the Z-axis direction under the control of the control unit 300 shown in Fig. 1. The spindle moving mechanism 13 includes a headstock base 13b, a plurality of sliders 13S, a motor 13M, and a ball screw mechanism (not shown).

[0025] The headstock base 13b is a plate-like member extending in the X-axis and Y-axis directions. A headstock 15 is installed on the upper surface of the headstock base 13b. Each slider 13S is fixed to the lower surface of the headstock base 13b and configured to be slidable in the direction of extension of a pair of rails 13R on the bed S. The pair of rails 13R extend parallel to each other in 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 moves the spindle unit 10 and the headstock base 13b on the rails 13R via the sliders 13S. Near the end of one of the rails 13R on the -Z side, a stopper 24 with an L-shaped cross section is connected to the bed S with a bolt. The stopper 24 prevents a slider 77 (described later) from slipping out of the rail 13R. The form of the stopper 24 is not limited to this, and a block-shaped stopper may be attached to the bed S.

[0026] Guide bushless device 60 is located on the outer periphery of main shaft 11. As shown in Fig. 2, guide bushless device 60 is formed with a through hole 60a through which the tip end side of main shaft 11 can pass.

[0027] The tool unit 30 machines the workpiece W gripped by the spindle unit 10. As shown in FIGS. 1 and 2, the tool unit 30 includes a tool table 34, a plurality of tools 31, 37, and a stopper 35.

[0028] The tool moving mechanism 33 (see FIG. 1) moves the tool table 34 in the Y-axis direction under the control of the control unit 300. The tool moving mechanism 32 (see FIG. 2) moves the tool table 34 in the X-axis direction under the control of the control unit 300.

[0029] The tool table 34 is arranged around the workpiece W gripped by the spindle unit 10. Tools 31, 37 and a stopper 35 are attached to the tool table 34. The multiple tools 31 and stoppers 35 extend in the X-axis direction and are arranged in the Y-axis direction. Each tool 31 is a fixed tool such as a cutting tool. The multiple tools 37 (see FIG. 1) are drills or the like that extend in the Z-axis direction and machine the end face of the workpiece W gripped by the spindle unit 10.

[0030] The stopper 35 has a rectangular pillar shape. As shown in FIG. 7(a), the stopper 35 has a contact surface 35a that can come into surface contact with the end surface of the workpiece W. The contact surface 35a is provided at the same position in the Z-axis direction as the cutting edge of the tool 31 aligned in the Y-axis direction. The contact surface 35a comes into contact with the end surface of the workpiece W pushed out by the push rod 51, which will be described later. This determines the amount (length) of the workpiece W that is pushed out.

[0031] As shown in FIGS. 1 and 2, the work supply device 50 is located on the -Z side (rear side) of the spindle unit 10 and the steady rest device 70, and is disposed on the floor 200. The work supply device 50 includes a push rod 51 and a power source (not shown) that moves the push rod 51 in its axial direction (Z-axis direction). The push rod 51 is a rod-shaped member that is positioned coaxially with the rotation axis of the workpiece W and extends in the Z-axis direction. The push rod 51 is not provided with a finger chuck that grips the workpiece W. The cross section of the push rod 51 is, for example, circular, and its diameter is slightly smaller than the diameter D of the circular hollow hole 21a. The push rod 51 is held in the work supply device 50 in an orientation in which its longitudinal direction faces horizontally (within the XZ plane) so that its end face matches that of the workpiece W shown in FIG. 5(a). The work supply device 50 moves the push rod 51 forward (in the +Z direction) while keeping it in contact with the end face of the workpiece W, and pushes the workpiece W toward the tip of the spindle 11. The push rod 51 can move forward until its tip reaches position PA in FIG. 7(a).

[0032] As shown in Figures 1 and 2, the steady-state device 70 is disposed rearward (on the -Z side) of the spindle unit 10, and supports a workpiece W that is longer than the spindle unit 10. As shown in Figures 2 and 4, the steady-state device 70 includes a steady-state base 72, a pair of sliders 77 (see Figure 4), a pair of connecting members 73, a connecting arm 78, an adjustment plate 80, an adjustment block 81, and a steady-state pipe 90. Note that although Figures 1 and 4 show partial cross sections, some hatching has been omitted from the perspective of visibility of the drawings.

[0033] As shown in Fig. 2, the vibration prevention base 72 is made up of a rectangular plate-shaped member that is long in the X-axis direction. As shown in Fig. 4, a slider 77 that slides on the rails 13R is attached to the underside of the vibration prevention base 72. This allows the vibration prevention base 72 to slide in the direction in which the pair of rails 13R arranged on the bed S extend.

[0034] As shown in Fig. 2, the pair of connecting members 73 are rod-shaped members that extend in the Z-axis direction and are spaced apart in the X-axis direction. These connecting members 73 connect the steady rest base 72 and the headstock base 13b. Both ends of the connecting member 73 in the Z-axis direction are fastened to the ends of the top surfaces of the bases 13b, 72 in the X-axis direction via bolts 73b. The width (length in the X-axis direction) of the connecting member 73 is narrower on the side of the steady rest base 72 than on the side of the headstock base 13b.

[0035] As shown in FIG. 4, when viewed from the X-axis direction, the connecting arm 78 has an L-shape with the first plate portion 78a and the second plate portion 78b intersecting at right angles. As shown in FIG. 2, the first plate portion 78a is fastened to the center of the upper surface of the steady-state support base 72 via a bolt 41. As shown in FIG. 4, the second plate portion 78b rises from the edge of the first plate portion 78a. An adjustment plate 80 supporting the steady-state support pipe 90 is fixed to the second plate portion 78b via a bolt 42. That is, the connecting arm 78 connects the steady-state support base 72 and the adjustment plate 80. A female thread 78c into which the bolt 42 is screwed is formed on the surface of the second plate portion 78b facing the -Z side. Furthermore, female threads (not shown) for fastening the bolts 43 are formed side by side in the Y-axis direction on both end surfaces of the second plate portion 78b facing the X-axis direction.

[0036] 2, the guide plate 82 is attached to both side surfaces of the second plate portion 78b via bolts 43. The guide plate 82 is made of a rectangular plate, and has a bent portion 82a at the edge on the -Z side that is bent toward the other guide plate 82. As a result of the guide plate 82 having the bent portion 82a, a space for accommodating the adjustment plate 80 is defined between the guide plate 82 and the second plate portion 78b of the connecting arm 78.

[0037] As shown in FIG. 4 , the adjustment plate 80 rotatably supports the anti-vibration pipe 90 via a bearing 83 incorporated therein at a position away from the connection point with the main shaft 11. The adjustment plate 80 is rectangular when viewed from the Z-axis direction, and has two bolt holes 80a that penetrate in the Z-axis direction and are aligned in the X-axis direction. A bolt 42 is passed through the bolt hole 80a and fastened to an internal thread 78c formed in the second plate portion 78b. The bolt 42 fixes the adjustment plate 80 to the second plate portion 78b in a state parallel to a plane including the X-axis and Y-axis (with the main surface facing the front-to-rear direction). The bolt hole 80a formed in the adjustment plate 80 is an elongated hole whose longitudinal direction is in the Y-axis direction. This allows the adjustment plate 80 to function as an adjustment mechanism that easily adjusts the position in the up-down direction. The adjustment plate 80 also has a circular opening 80b that penetrates in the Z-axis direction. A bearing 83 that supports the anti-vibration pipe 90 is attached to the periphery of this opening 80b. A retaining ring 84 is attached to the mounting location of the bearing 83 to prevent the bearing 83 from falling off.

[0038] As shown in FIGS. 4 and 6, the adjustment block 81 has a rectangular parallelepiped shape and is attached to the rear surface (the surface facing the -Z direction) of the connecting arm 78 by two bolts 44 (see FIG. 6) that are passed through from the -Z direction. As shown in FIG. 4, a female screw 81a that penetrates the adjustment block 81 in the Y-axis direction is formed in the center. An adjustment bolt 45 with its head 45a facing upward (toward the +Y side) is screwed into this female screw 81a. An adjustment plate 80 is placed from above on the head 45a of the adjustment bolt 45. As a result, by rotating the adjustment bolt 45, the adjustment plate 80 can be moved up and down to adjust the position of the anti-vibration pipe.

[0039] The anti-vibration pipe 90 has a cylindrical shape extending coaxially with the workpiece W and suppresses vibration of the workpiece W positioned inside the anti-vibration pipe 90. The inner diameter of the hollow portion of the anti-vibration pipe 90 is approximately the same as the outer diameter of the anti-vibration bushing 21, as shown in FIG. 5(b). This allows the anti-vibration bushing 21 to be housed inside the anti-vibration pipe 90 without rattle. As shown in the enlarged view of FIG. 1, an annular flange 91 is formed on the +Z side end of the anti-vibration pipe 90. A nut 92 having a hole formed in the center through which the pipe is passed is also passed through the anti-vibration pipe 90. This nut 92 is threaded onto a threaded portion 19 formed on the outer peripheral surface of the main shaft 11, so that the flange 91 is sandwiched between the -Z side end face of the main shaft 11 and the nut 92. As a result, the anti-vibration pipe 90 is connected to the end of the main shaft 11 and rotates axially as the main shaft 11 rotates. 4, the anti-vibration pipe 90 is passed through a bearing 83, and the portion closer to the -Z side of the center is rotatably supported by the bearing 83. This allows the anti-vibration pipe 90 to rotate smoothly around the axis together with the main shaft 11.

[0040] As shown in the enlarged view of FIG. 1 , the connection between the anti-vibration pipe 90 and the spindle 11 employs a spigot joint structure in which the end of the anti-vibration pipe 90 is inserted into the hollow portion of the spindle 11 until the flange 91 contacts the end face of the spindle 11. The spindle 11 has a spindle pipe 11b inside, which has an inner diameter identical to that of the anti-vibration pipe 90 inserted in this manner. This allows the hollow portion of the anti-vibration pipe 90 and the hollow portion of the spindle 11 to be coaxially connected in the Z-axis direction. Inside this continuous hollow portion, the one anti-vibration bush 20 and twelve anti-vibration bushes 21 described above are aligned in a row in the Z-axis direction. The lengths of the anti-vibration bushes 20 and 21 are each set to allow the anti-vibration bushes 20 and 21 to be removed from between the workpiece supply device 50 and the anti-vibration pipe 90. Adjacent anti-vibration bushes 20 and 21 are connected via a pin 23. Among the anti-sway bushings 21, the anti-sway bushing 21 arranged furthest on the -Z side (rearward) has an expanding diameter hollow hole 21g formed therein, the diameter of which linearly expands from the circular hollow hole 21a and the rectangular hollow hole 21b toward the -Z side end. By forming the expanding diameter hollow hole 21g, it is possible to make it easier for the workpiece W and the push rod 51 to enter the anti-sway bushing 21.

[0041] Control unit 300 controls the operation of each unit of machine tool 1. Control unit 300 is made up of a CPU (Central Processing Unit), a memory, etc. Control unit 300 executes machining processing in accordance with a preset program.

[0042] When installing the steady-stop device 70, the adjustment bolt 45 shown in Figures 4 and 6 is rotated to raise and lower the adjustment plate 80, thereby aligning the center positions of the steady-stop pipe 90 and the main shaft 11. After performing such adjustment using the adjustment bolt 45, the adjustment plate 80 and the connecting arm 78 are fastened together with the bolt 42, and the steady-stop device 70 is installed.

[0043] After the installation of the anti-sway device 70 is completed, the work supply device 50 is installed on the floor 200 so that the center position of the anti-sway pipe 90 and the center position of the push rod 51 coincide with each other.

[0044] Preparations for machining a workpiece W using the machine tool 1 thus installed will now be described.

[0045] First, the workpiece W is gripped by the machine tool 1. Specifically, the collet chuck 11a shown in Fig. 3 is opened, and the rod-shaped workpiece W is inserted into the spindle 11. Then, the collet chuck 11a is closed to grip the workpiece W.

[0046] Next, the steady-stop bushings 20, 21 are attached to the machine tool 1. The steady-stop bushings 20, 21, fitted with the O-rings 22, are inserted into the steady-stop pipe 90 from the rear. At this time, the workpiece W is inserted into the rectangular hollow hole 21b shown in FIG. 5(a), and the steady-stop bushings 20, 21 are sequentially sent forward while being guided by the workpiece W. This allows the positional relationships around the rotation axis between the workpiece W, the steady-stop bushings 20, 21, and the collet chuck 11a to all be set to predetermined positional relationships (hereinafter referred to as being in phase). Because the phases of adjacent steady-stop bushings 20, 21 are also in phase, the steady-stop bushings 20, 21 can be pressed in and connected to each other by the pin 23.

[0047] Next, the collet chuck 11a is opened, the workpiece W is released, and the workpiece W is returned to the workpiece supply position of the workpiece supply device 50. Then, the phase of the workpiece W at the workpiece supply position of the workpiece supply device 50 is aligned with the phase of the steady-stop bushings 20, 21 in the spindle 11. Specifically, the spindle 11 is rotated so that the phase of the workpiece W in the workpiece supply device 50 and the phase of the steady-stop bushings 20, 21 in the spindle 11 are aligned. The control unit 300 stores the rotation angle of the spindle 11 when the phase is aligned. Because the phase of the workpiece W in the workpiece supply device 50 is constant, the rotation angle of the spindle 11 can be stopped at the stored angle thereafter to align the phase of the workpiece W in the workpiece supply device 50 and the phase of the steady-stop bushings 20, 21 in the spindle 11. This completes the preparations for machining the workpiece W.

[0048] Next, the processing for processing the workpiece W will be described.

[0049] First, the control unit 300 moves the spindle unit 10 backward (in the −Z-axis direction) by the product length of the workpiece W via the spindle movement mechanism 13. Here, the product length is the length of the workpiece W cut off by the cut-off process described below.

[0050] Next, the control unit 300 moves the tool table 34 using the tool moving mechanisms 32, 33, moves the stopper 35 on the tool table 34 onto the rotation axis of the workpiece W, and positions the contact surface 35a of the stopper 35 opposite the end surface of the workpiece W.

[0051] Next, the control unit 300 opens the collet chuck 11a, and then moves the push rod 51 forward to enter the anti-vibration pipe 90, causing the push rod 51 to push the workpiece W to a position where it contacts the stopper 35, as shown in Figure 7(a).

[0052] Next, the control unit 300 operates an air cylinder (not shown) to close the collet chuck 11a and grip the workpiece W. As a result, a portion of the workpiece W that is equal to or longer than the product length is exposed from the spindle 11.

[0053] Next, the control unit 300 moves the push rod 51 backward to move it out of the steady pipe 90, and then moves the spindle unit 10 forward to the processing position via the spindle movement mechanism 13, and performs processing with the tool unit 30.

[0054] Next, after machining the workpiece W, the control unit 300 performs cut-off (cutting) machining on the workpiece W using a cut-off tool, and discharges the product, which is the separated workpiece, to the front. This discharged product is transported to the outside of the machine tool 1 using a workpiece discharge device such as a chute and workpiece conveyor (not shown).

[0055] This completes the processing for manufacturing one product from the workpiece W. To continue processing the workpiece W, the push rod 51 is advanced, exposing a portion of the workpiece W longer than the product length from the spindle 11 and processing it. Each time the workpiece W is processed, the length of the workpiece W in the spindle unit 10 is shortened by the product length. When the workpiece W becomes too short to manufacture a single product, the workpiece W remaining in the spindle 11 becomes a scrap. A new workpiece W from the work supply device 50 is fed into the collet chuck 11a and pushed forward from the spindle 11. When a new workpiece W is supplied, stopping the spindle 11 at the stored rotation angle aligns the phase of the workpiece W in the work supply device 50 with the steady-stop bushings 20 and 21 in the spindle 11, enabling smooth supply of the workpiece W. This processing is merely an example, and the order of the processes may be reversed or performed simultaneously.

[0056] (effect) According to the embodiment described above, the following effects are achieved. (1) In the above embodiment, the anti-sway device 70 is an anti-sway device 70 for a workpiece W machined by a machine tool 1, and includes an anti-sway pipe 90 connected to the end of the spindle 11 that rotates the workpiece W about its axis and rotates together with the spindle 11, anti-sway bushings 20, 21 that are provided inside the anti-sway pipe 90 and inside the spindle 11 and have retaining holes 21b that correspond to the cross-sectional shape of the workpiece W and that hold the workpiece W inserted into the retaining holes 21b, and a bearing 83 that rotatably supports the anti-sway pipe 90 at a position away from the connection point with the spindle 11. This configuration provides the following advantages (a) to (d). (a) An anti-vibration bushing having a retaining hole 21b that matches the cross-sectional shape of the workpiece W is provided inside the anti-vibration pipe 90. As a result, even if the cross section of the workpiece W is not circular but has an irregular shape such as an I-shape, the workpiece W is held by the anti-vibration bushings 20, 21, and vibration can be suppressed. Furthermore, without the anti-vibration bushings 20, 21, when an irregularly shaped workpiece W is rotated, it will hit the circular anti-vibration pipe 90, damaging both the workpiece W and the anti-vibration pipe 90, but by providing the anti-vibration bushings 20, 21, it is possible to prevent such damage. (b) Even when the cross-sectional shape of the workpiece W to be machined needs to be changed, the anti-vibration bushings 20, 21 can be replaced with ones having holding holes of different shapes, so that the change in the shape of the workpiece W can be easily accommodated. (c) The anti-vibration pipe 90 is supported at two points: the end of the main shaft 11 and the bearing 83. This allows the anti-vibration pipe 90 to be stably supported, making it possible to suppress vibration of the workpiece W. (d) By connecting the anti-vibration pipe 90 to the end of the spindle 11, the workpiece W can be supported continuously without any gaps. This makes it possible to suppress the vibration of the workpiece W.

[0057] (2) In the steady-state device according to the above embodiment, the bearing 83 is provided in an adjustment mechanism for aligning the center position of the steady-state pipe 90 with the center position of the main shaft 11 . This makes it easier to align the center position of the anti-vibration pipe 90 with the center position of the spindle 11, thereby suppressing vibration of the workpiece W caused by misalignment of the centers.

[0058] (3) In the above embodiment, the machine tool 1 includes a spindle unit 10 having a spindle 11 and rotating the spindle 11 about its axis, and the steady rest device 70 described in (1) or (2) above. This makes it possible to provide a machine tool 1 having the above-mentioned effects (1) and (2).

[0059] (4) In the above embodiment, the work supply processing system 5 includes the machine tool 1 described in (3) above, and a work supply device 50 located behind the machine tool 1 and supplying the work W to the spindle unit 10 through an anti-vibration pipe 90. The work supply device 50 has a push rod 51 that can move back and forth relative to the work W. When the push rod 51 moves forward, it pushes the end face of the work W to send the work W toward the tip of the spindle unit 10, and when it moves backward, it moves away from the work W. This configuration provides the following advantages (a) to (c). (a) In this embodiment, the push rod 51 does not have a finger chuck for gripping the workpiece W, so it is possible to reduce the amount of waste material in the workpiece W. Hereinafter, this embodiment will be described in detail while being compared with a comparative technique. 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 periphery, so the finger chuck 152 interferes with the tip of the collet chuck 11a. Therefore, there is a limit to the forward position of the finger chuck 152, and the length L3 of the remaining material of the workpiece W becomes long. 7(a), the tip of the push rod 51 does not interfere with the collet chuck 11a, and the length L4 of the remaining workpiece W can be made shorter than the length L3. Therefore, the amount of wasted workpiece W can be reduced. (b) In this embodiment, the push rod 51 does not have a finger chuck for gripping the workpiece W, so it is possible to reduce the gap between the anti-vibration bushings 20, 21 of the spindle unit 10 and the workpiece W, thereby suppressing vibration of the workpiece W. This embodiment will be described in detail below, comparing it with a comparative technique. In the comparative technology shown in Figures 7(b) and 8(b), the finger chuck 152 is configured to grip the end of the workpiece W from the outer periphery, and therefore the outer diameter of the finger chuck 152 is larger than the outer diameter of the workpiece W. Also, in this comparative technology, in order to enable the finger chuck 152 to enter the anti-sway bushings 120, 121, it is necessary to form the inner diameter of the anti-sway bushings 120, 121 to be equal to or larger than the outer diameter of the finger chuck 152. When the inner diameter of the anti-sway bushings 120, 121 becomes large as in this comparative technology, a gap Sk is formed between the inner peripheral surface of the anti-sway bushings 120, 121 and the outer peripheral surface of the workpiece W, and the gap Sk causes the workpiece W to wobble. In addition, Figure 8(b) relating to the comparative technology shows the state in which the finger chuck 152 is moving forward, but particularly when the finger chuck 152 is located at the rear of the anti-vibration pipe 90, the workpiece W vibrates more due to the gap Sk, and the machining accuracy decreases. 8(a), in this embodiment, the push rod 51 does not have a finger chuck for gripping the workpiece W, so the inner diameter of the steady bushings 20, 21 can be adjusted to the outer diameter of the workpiece W, and the gap between the steady bushings 20, 21 and the workpiece W can be reduced. This makes it possible to suppress the shake of the workpiece W. (c) In this embodiment, the push rod 51 can move backward to separate from the workpiece W during machining and go outside the steady-stop pipe 90. As a result, the workpiece W is not affected by the push rod 51 during machining, and a decrease in machining accuracy due to the push rod 51 is suppressed. On the other hand, in a configuration with a finger chuck 152, such as the comparative technology shown in Figures 7(b) and 8(b), the finger chuck 152 grips the workpiece W while the workpiece W is being machined, and therefore the push rod 151 cannot move out of the steady-stop pipe 90. In addition, since the finger chuck 152 rotates together with the workpiece W while the workpiece W is being machined, there is a risk of a decrease in machining accuracy.

[0060] (5) In the work supply processing system 5 according to the above embodiment, the spindle unit 10 stops the rotation of the spindle 11 at a predetermined rotation angle so that the phase of the work W supplied from the work supply device 50 matches the phase of the anti-vibration bushings 20, 21. This allows the anti-vibration pipe 90, which rotates together with the main shaft 11, to be at a predetermined angular position (predetermined phase), and the workpiece W supplied from the workpiece supply device 50 can be smoothly inserted into the anti-vibration pipe 90.

[0061] (6) The headstock 15 and the steady rest device 70 are connected via a connecting member 73 and move on a common rail 13R. As a result, the headstock 15 and the steady-state device 70 are interlocked, so that the positional relationship (distance) of the steady-state device 70 with respect to the headstock 15 can be kept constant. Therefore, regardless of the position of the headstock 15, the steady-state pipe 90 is stably supported by the steady-state device 70, making it possible to suppress the vibration of the workpiece W. Furthermore, there is no need to provide a separate structure for moving the steady-state device 70, which simplifies the structure.

[0062] (7) The anti-vibration bushings 20, 21 housed in the main shaft 11 and the anti-vibration pipe 90 are divided into multiple parts, and the length of each part is set to a length that allows the anti-vibration bushings 20, 21 to be removed from between the work supply device 50 and the anti-vibration pipe 90. This allows the anti-vibration bushings 20, 21 to be replaced between the work supply device 50 and the anti-vibration pipe 90 when the cross-sectional shape of the work changes, and the relationship between the spindle 11, the anti-vibration pipe 90, and the work supply device 50, with their central positions aligned, can be maintained. Furthermore, when replacing the anti-sway bushings 20, 21, there is no need to move the work supply device 50, and the replacement work of the anti-sway bushings 20, 21 can be easily performed.

[0063] The present invention is not limited to the above-described embodiments and drawings. Modifications (including the omission of components) can be made as appropriate within the scope of the present invention. An example of a modification will be described below.

[0064] In the above embodiment, the number of spindle units 10 is not limited to one and 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 the workpiece W from the first spindle unit, machine the workpiece W using the tool unit 30 or a tool unit other than the tool unit 30, and then discharge the machined workpiece W to a discharge section such as a chute.

[0065] The length of the rail 13R is not limited to that in the above embodiment, and may be longer or shorter than that in the above embodiment.

[0066] The anti-vibration pipe 90 is supported at two points, the anti-vibration device 70 (bearing 83) and the end of the main shaft 11, but it may be supported at three or more points. For example, a new support portion that supports the anti-vibration pipe 90 may be provided on the anti-vibration base 72, or the anti-vibration device 70 may support the anti-vibration pipe 90 at multiple points. This makes it possible to stably support even longer workpieces W.

[0067] The configuration of the tool stand 34 and the arrangement and types of the tools 31 and 37 can be changed as appropriate.

[0068] The connecting member 73, the vibration-preventing base 72, and the connecting arm 78 may be integrally formed.

[0069] One end of the connecting member 73 is fixed to the headstock base 13b in the above embodiment, but this is not limiting and the connecting member 73 may be fixed to the headstock 15. The other end of the connecting member 73 is fixed to the steady rest base 72 in the above embodiment, but this is not limiting and the connecting member 73 may be fixed to the steady rest device 70 or the connecting arm 78.

[0070] The anti-sway device 70 and the spindle unit 10 are configured to be movable using a common rail 13R, but this is not limited to this, and they may each be configured to be movable using rails that are separate components.

[0071] The cross section of the push rod 51 that pushes the workpiece W is circular, but it may have another cross section, such as the same shape as the workpiece W or a square. In addition, the diameter of the cross section of the push rod 51 may be made smaller to make it easier to insert the push rod 51 into the steady-stop pipe 90.

[0072] Furthermore, the workpiece W to be machined is not limited to having an I-shaped cross section, but may have various cross-sectional shapes such as a circle, an ellipse, a cross, a polygon, etc. When machining a workpiece W having such other shapes, the shape of the holding holes of the steady-stop bushings 20, 21 may be made to correspond to the shape of the workpiece W to be held.

[0073] Furthermore, the bolt holes 80a formed in the adjustment plate 80 are not limited to elongated holes in the Y-axis direction, but may be enlarged holes larger than normal bolt holes, for example. This allows the adjustment plate 80 to be adjusted in various directions.

[0074] Furthermore, the headstock 15 and the vibration suppression device 70 may not be connected by the connecting member 73, and the vibration suppression device 70 may be fixed to the bed S.

[0075] Furthermore, in order to align the phase of the workpiece W supplied from the workpiece supply device 50 with the anti-vibration bushings 20, 21, the spindle 11 is stopped at the stored rotation angle, but the spindle 11 may also be stopped based on a sensor or the like that detects the position.

[0076] Additionally, although the circular hollow hole 21a has been described as a hole through which the push rod 51 passes, it may also be used as a holding hole for holding a workpiece W having a circular cross section. This allows workpieces of two different shapes to be held by one type of steady bushing 20, 21, reducing the burden of replacing the steady bushings 20, 21. Furthermore, the steady bushings 20, 21 may be formed with holding holes that can accommodate workpieces of three or more different cross-sectional shapes. [Explanation of symbols]

[0077] 1...machine tool, 5...workpiece supply processing system, 10...spindle unit, 11...spindle, 11a...collet chuck, 11b...spindle pipe, 11d...collet sleeve, 11h...chuck nut, 11k...inclined surface, 11m...step portion, 11t...flange portion, 13...spindle movement mechanism, 13M...motor, 13R...rail, 13S...slider, 13b...spindle base, 15...spindle, 16, 17... Bearing, 18... motor, 19... threaded portion, 20, 21... steady-state bushing, 20e, 21e... pin insertion hole, 21a... circular hollow hole, 21b... rectangular hollow hole (retaining hole), 21f... groove, 21g... expanded diameter hollow hole, 22... O-ring, 23... pin, 24... stopper, 25... spring, 30... tool unit, 31... tool, 32, 33... tool moving mechanism, 34... tool stand, 35... stopper, 35a... contact surface, 37... tool , 41, 42, 43, 44... Bolt, 45... Adjustment bolt, 45a... Head, 50... Work supply device, 51... Push rod, 60... Guide bushless device, 60a... Through hole, 70... Anti-vibration device, 72... Anti-vibration base, 73... Connecting member, 73b... Bolt, 77... Slider, 78... Connecting arm, 78a... First plate portion, 78b... Second plate portion, 78c... Female thread, 80... Adjustment plate, 80a... Bolt hole, 80b... Opening, 81...adjustment block, 81a...female thread, 82...guide plate, 82a...bending portion, 83...bearing, 84...retaining ring, 90...anti-vibration pipe, 91...flange portion, 92...nut, 120, 121...anti-vibration bushing, 151...push rod, 152...finger chuck, 200...floor, 300...control portion, C...circle, D...diameter, L1...long side, L2...short side, PA...position, S...bed, W...workpiece, Sk...gap

Claims

1. A steady rest device for a workpiece to be machined by a machine tool, a vibration-retaining pipe connected to an end of a spindle that rotates the workpiece and rotates together with the spindle; a vibration-reducing bushing provided inside the vibration-reducing pipe and inside the spindle, the bushing having a holding hole corresponding to a cross-sectional shape of the workpiece and configured to hold the workpiece inserted into the holding hole; a bearing that rotatably supports the anti-vibration pipe at a position away from a connection point with the main shaft; A steady rest device comprising:

2. The bearing is provided in an adjustment mechanism for aligning the center position of the vibration-reducing pipe with the center position of the main shaft. The steady rest device according to claim 1 .

3. a spindle unit having the spindle and rotating the spindle around its axis; The anti-vibration device according to claim 1 or 2, Machine tools.

4. The machine tool according to claim 3; a work supply device that is located at the rear side of the machine tool and supplies a workpiece to the spindle unit through the steady rest pipe, The work supply device has a push rod that can move back and forth relative to the work, The push rod advances to push the end surface of the workpiece and send the workpiece toward the tip of the spindle unit, and retreats to move away from the workpiece. Work supply processing system.

5. the spindle unit stops the rotation of the spindle at a predetermined rotation angle so that the phase of the workpiece supplied from the work supply device and the phase of the steady-stop bushing are aligned; The workpiece supply and processing system according to claim 4 .

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