JP4466142B2 - Machine tool with steady rest - Google Patents

Description

  The present invention relates to a machine tool provided with a steady rest device.

2. Description of the Related Art Conventionally, there is a machine tool provided with a steady rest device in which the tailstock and the steady rest device are movable in the axial direction of the workpiece (see, for example, Patent Document 1). In the machine tool disclosed in Patent Document 1, the base member of the steady rest is disposed on the front side (operator side) of the intermediate region between the base member of the headstock and the base member of the tailstock. Yes. As described above, the base member of the steady rest is disposed in front of the intermediate region between the base member of the headstock and the base member of the tailstock when the tailstock and the steady rest are moved. This is to prevent the base member of the tailstock from interfering with the base member of the steady rest. The disclosed machine tool can be applied to workpieces having various workpiece lengths by making the tailstock and the steady rest device movable.
JP-A-6-114691

  However, a machine tool equipped with a conventional steady rest device is arranged so that the base member of the tailstock and the base member of the steady rest device do not interfere with each other. The distance to the workpiece was increased. For this reason, there is a problem in that the work supporting force due to the rigidity of the steady rest decreases. Here, the support force of the workpiece by the steady rest device influences the machining accuracy of the workpiece.

  Further, if the tailstock is fixed on the bed, the position of the base member of the steady rest device can be brought close to the work, but in this case, it can be applied to various work lengths. Can not.

  The present invention has been made in view of such circumstances, and can be applied to a workpiece having various workpiece lengths, and can improve the workpiece supporting force by the steady rest device, thereby achieving higher-precision machining. An object of the present invention is to provide a machine tool including a steady rest device capable of performing the above.

  Therefore, the present inventor has intensively studied to solve this problem, and as a result of repeated trial and error, the present inventor can be applied to a workpiece having various workpiece lengths by moving the headstock, and the workpiece by the steady rest device. The present inventors have come up with the idea that the supporting force can be improved and have completed the present invention.

(First invention)
That is, a machine tool provided with the first steady rest device of the present invention includes a bed, a headstock base disposed on the bed, and one end side of a workpiece that is disposed on the headstock base and has a substantially rod shape. A main spindle having a main spindle that can be rotatably supported around the axis of the workpiece, a tailstock base disposed on the bed and opposed to the mainstock, and on the tailstock base A tailstock having a tailstock shaft portion disposed and capable of rotating and supporting the other end side of the workpiece around the axis of the workpiece; and an axial direction and an axis orthogonal direction of the workpiece supporting the tool and the bed A tool base disposed on the bed so as to be movable to the bed, a steadying base and at least a part of which is disposed in an intermediate region between the headstock base and the tailstock base on the bed, and the steadying base The intermediate part of the work placed above is supported An anti-sway device having an anti-sway portion, a spindle base driving means for driving the headstock in the axial direction of the work with respect to the bed, and the tailstock in the axial direction of the work with respect to the bed A tailstock driving means for driving
The steady rest is fixed on the bed,
The headstock driving means positions and drives the headstock to the work support position by the head stock determined based on the work support position and the work shape by the steady rest device,
The tailstock driving means positions and drives the tailstock to a support position of the work by the tailstock determined based on a support position of the work by the steadying device and a shape of the work. (Claim 1).

  That is, the characteristic configuration of the machine tool including the first steady rest device of the present invention is that the spindle stock and the tailstock are movable. Furthermore, another characteristic configuration is that at least a part of the steady rest base is disposed in an intermediate region between the headstock base and the tailstock base. Here, the headstock base is a base part of the headstock. The tailstock base is a base portion of the tailstock. The steady rest base is a base part of the steady rest device. And by comprising such a structure, when supporting a workpiece before processing, by moving the headstock and the tailstock with reference to the position of the steady rest device fixed on the bed, Can do. Furthermore, when the lengths of the workpieces in the longitudinal direction are different, the distance between the headstock and the tailstock may be changed according to the workpiece length.

  Conventionally, an anti-rest base could not be disposed between the headstock base and the tailstock base to prevent interference. However, according to the machine tool provided with the first anti-rest device of the present invention, The steady rest base can be disposed between the head stock base and the tailstock base. Furthermore, according to the present invention, even if the steady rest base is disposed between the head stock base and the tailstock base, it can be applied to workpieces having various workpiece lengths. And by setting it as such a structure, the arrangement position of the steadying base of a steadying apparatus can be brought closer to a workpiece | work compared with the past. That is, since the distance between the steady rest base and the workpiece can be shortened, the rigidity of the steady rest device can be improved. As a result, the work supporting force by the steady rest device can be improved. Thereby, according to this invention, while being applicable to the workpiece | work which consists of various workpiece | work length, more highly accurate process can be performed.

  Furthermore, by making it possible to dispose the steady rest base in the spindle base, the tailstock base, and the intermediate region, it is possible to reduce the size of the steady rest device as compared with the prior art. As a result, the distance from the worker's position to the workpiece support position can be shortened, leading to improved workability. On the other hand, when the overall size of the apparatus is made the same as the conventional size, the headstock base, the tailstock base and the steady rest base can be made larger than the conventional size. That is, the rigidity of the headstock, the tailstock, and the steady rest can be further increased. As a result, processing with higher accuracy is possible, and processing time is shortened.

Furthermore, according to the machine tool provided with the first steadying device, the steadying base of the steadying device is fixed to the bed . Thus, by fixing the steady rest device on the bed, the steady rest device has higher rigidity than the steady rest device driven by the ball screw. In other words, since the rigidity of the steady rest device can be increased, more accurate processing can be performed. Even if the steady rest is fixed on the bed, it can be applied to a workpiece having various workpiece lengths by moving the headstock and the tailstock, respectively.

Further, in the machine tool provided with the first steady rest device, the bed has a guide rail formed in the axial direction of the workpiece, and the headstock and the tailstock are the same guide rail. The upper part may be slidable ( claim 3 ). By using a common guide rail for moving the headstock and a guide rail for moving the tailstock, the relative movement accuracy between the headstock and the tailstock can be improved. Furthermore, since the assembly structure of the headstock and the tailstock to the guide rail can be made common, the parts can be made common and the cost can be reduced. The spindle stock and the tailstock may sandwich the guide rail. Further, the guide rail may be composed of a pair of guide rails. For example, two parallel guide rails may be formed on the bed, and the headstock and the tailstock may slide on the two guide rails.

Further, when the headstock and tailstock on the guide rails formed in the bed is arranged slidably, the steady rest device may be configured to be disposed on the guide rail (according Item 4 ). That is, the headstock, the tailstock, and the steadying device are disposed on the same guide rail. Thus, by arranging the headstock, the tailstock, and the steady rest on the same guide rail, conventionally, it is necessary to form three arrangement bases on the bed as the respective arrangement bases. Compared with this, the manufacturing cost of the bed can be greatly reduced. The steady rest device may be movably disposed on the guide rail or may be fixedly disposed on the guide rail.

(Second invention)
A machine tool provided with the second steady rest device of the present invention has a bed and a main shaft that is disposed on the bed and is capable of rotating and supporting one end side of a substantially rod-shaped workpiece around the axis of the workpiece. A headstock, a tailstock having a tailstock arranged on the bed so as to face the headstock and capable of rotating and supporting the other end of the work around the axis of the work, and supporting a tool, A tool base disposed on the bed so as to be movable in an axial direction and an axis orthogonal direction of the workpiece with respect to the bed, and fixedly disposed between the headstock and the tailstock on the bed. A steady rest device for supporting an intermediate part of the work, a head stock driving means for driving the head stock in the axial direction of the work with respect to the bed, and the tailstock in the axial direction of the work with respect to the bed A tailstock driving means for driving ,
The headstock driving means positions and drives the headstock to the work support position by the head stock determined based on the work support position and the work shape by the steady rest device,
The tailstock driving means positions and drives the tailstock to a support position of the work by the tailstock determined based on a support position of the work by the steadying device and a shape of the work. (Claim 2).

  That is, the characteristic configuration of the machine tool provided with the second steady rest device of the present invention is that the spindle stock and the tailstock are movable. Furthermore, another characteristic configuration is that the steady rest device is fixedly disposed on the bed. Due to such a configuration, when the workpiece is supported before processing, the headstock and the tailstock are moved with reference to the position of the steadying device fixedly arranged on the bed. Furthermore, when the lengths of the workpieces in the longitudinal direction are different, the distance between the headstock and the tailstock may be changed according to the workpiece length.

  According to the machine tool equipped with the second steady rest device of the present invention, since the steady rest device is fixedly disposed on the bed, the rigidity of the steady rest device is higher than that of the movable conventional steady rest device. Can be improved. Further, by improving the rigidity of the steady rest device, it is possible to perform more accurate processing. Furthermore, according to the machine tool provided with the first steady rest device, as described above, even if the workpiece length is different, the spindle head and the tailstock are moved in accordance with the workpiece length. be able to. That is, according to the machine tool provided with the first steady rest device of the present invention, it can be applied to workpieces having various workpiece lengths.

  Moreover, according to the machine tool provided with the second steady rest device of the present invention, the steady rest device is disposed on the guide rail on which the spindle stock and the tailstock are disposed. The distance from the position where the workpiece is supported on the bed to the workpiece supporting position can be shortened as compared with the conventional machine tool.

(Common matters regarding the first invention and the second invention)
In the machine tool provided with the first and second steady rest devices, the main shaft portion of the headstock may include a chuck for gripping one end side of the work, or only the shaft center on one end side of the work. A support center may be provided, or both the chuck and the center may be provided. And this spindle part is good to set it as the structure which can be rotationally driven by rotational drive means, such as a motor. Further, the tailstock shaft portion of the tailstock may be provided with a chuck, may be provided with a center, or may be provided with a chuck and a center, like the main shaft portion of the headstock. Good. The tailstock shaft portion may be configured to rotate with the rotation of the main shaft portion, or may be configured to be rotationally driven by a rotation driving means such as a motor that can be synchronized with the rotation of the main shaft portion. Further, the steady rest device may be provided with one steady rest portion or a plurality of steady rest portions.

Further, the head stock driving means positions and drives the head stock to the work support position by the head stock determined based on the work support position and the work shape by the steady rest device . Further, the tailstock driving means positions and drives the tailstock to the workpiece support position by the tailstock determined based on the support position of the workpiece by the steadying device and the shape of the workpiece .

Moreover, in the machine tool provided with the first and second steady rests of the present invention, the tool is a grindstone, the tool table rotatably supports the grindstone, and the machine tool is a grinder. ( Claim 5 ). By applying the present invention to a grinding machine, it is possible to process a workpiece that requires high accuracy. Needless to say, the present invention can be applied to other machine tools such as a lathe.

Further, the workpiece to be machined by the machine tool of the present invention may be a crankshaft or camshaft (claim 6). These workpieces are workpieces that require high precision and shorten machining time. That is, by applying the present invention, high accuracy and shortening of the processing time can be achieved.

Next, the present invention will be described in more detail with reference to embodiments.
(1) 1st Embodiment First, the machine tool provided with the steadying apparatus in 1st Embodiment is demonstrated. The machine tool provided with the steady rest in the first embodiment is a grinding machine in which the headstock, the tailstock, and the steady rest are movably disposed on the same guide rail. A machine tool provided with the steady rest device in the first embodiment will be described with reference to FIGS. FIG. 1 is a plan view of a machine tool according to the first embodiment. FIG. 2 is a front view of the machine tool according to the first embodiment. FIG. 3 is a schematic diagram of a workpiece support portion of the machine tool according to the first embodiment.

(Overall configuration of the machine tool of the first embodiment)
The machine tool in 1st Embodiment has the bed 1 which consists of a substantially rectangular parallelepiped, as shown in FIG. The bed 1 is divided into a grindstone support portion 2 which is the back side (upper side in FIG. 1) of the bed 1 and a work support portion 3 which is the front side of the bed 1 (lower side in FIG. 1).

(Configuration of the grindstone support portion 2 of the first embodiment)
First, the grindstone support part 2 will be described with reference to FIG. The grindstone support 2 includes a grindstone Z-axis guide rail 4, a grindstone Z-axis ball screw 5a, 5b, a grindstone Z-axis servomotor 6a, 6b, a grindstone table 7a, 7b, and a grindstone X-axis ball. It comprises screws 8a and 8b, grinding wheel X-axis servo motors 9a and 9b, grinding wheel bases 10a and 10b, and grinding wheels 11a and 11b.

  Two Z-axis guide rails 4 for the grindstone are formed on the back side on the upper surface side of the bed 1 so as to extend in the Z-axis direction. The Z-axis ball screws 5a and 5b for the grindstone extend between the Z-axis guide rails 4 for the grindstone of the bed 1 and are supported so as to be rotatable around the Z-axis. The left grindstone Z-axis servomotor 6a is connected to the left end of the left grindstone Z-axis ball screw 5a, and drives the left grindstone Z-axis ball screw 5a to be rotatable. The right grinding wheel Z-axis servomotor 6b is connected to the right end of the right grinding wheel Z-axis ball screw 5b, and drives the right grinding wheel Z-axis ball screw 5b to be rotatable. The left grindstone table 7a is slidably disposed on the grindstone Z-axis guide rail 4, and the lower side is connected to the left Z-axis ball screw 5a. That is, the left grindstone table 7a is moved in the Z-axis direction by the rotation of the left Z-axis ball screw 5a. Furthermore, two X-axis guide rails 71a for the grindstone are formed on the upper surface of the left grindstone table 7a so as to extend in the X-axis direction. The right grindstone table 7b is slidable on the grindstone Z-axis guide rail 4 and is disposed on the right side of the left grindstone table 7a. The lower side is connected to the right Z-axis ball screw 5b. That is, the right grindstone table 7b is moved in the Z-axis direction by the rotation of the right Z-axis ball screw 5b. Furthermore, two X-axis guide rails 71b for the grindstone are formed on the upper surface of the right grindstone table 7b so as to extend in the X-axis direction.

  The left-side grindstone X-axis ball screw 8a extends between the left-side grindstone X-axis guide rails 71a on the left-side grindstone table 7a and is supported rotatably around the X-axis. The right grinding wheel X-axis ball screw 8b extends between the right grinding wheel X-axis guide rail 71b on the right grinding wheel table 7b and is supported so as to be rotatable about the X axis. The left grindstone X-axis servomotor 9a is connected to the upper end of the left grindstone X-axis ball screw 8a, and drives the left grindstone X-axis ball screw 8a to be rotatable. The right grinding wheel X-axis servomotor 9b is connected to the upper end of the right grinding wheel X-axis ball screw 7b, and drives the right grinding wheel X-axis ball screw 8b to be rotatable. The left grinding wheel base 10a is slidably disposed on the left grinding wheel X-axis guide rail 71a, and the lower side is connected to the left X-axis ball screw 8a. That is, the left grinding wheel base 10a moves in the X-axis direction by the rotation of the left X-axis ball screw 8a. The right grinding wheel base 10b is slidably disposed on the right grinding wheel X-axis guide rail 71b, and the lower side is connected to the right X-axis ball screw 8b. That is, the right grinding wheel base 10b moves in the X-axis direction by the rotation of the right X-axis ball screw 8b. The left grinding wheel 11a and the right grinding wheel 11b are pivotally supported by the left grinding wheel base 10a and the right grinding wheel base 10b, respectively, so as to be rotatable around the Z axis.

(Configuration of the work support unit 3 of the first embodiment)
Next, the workpiece support 3 will be described with reference to FIGS. The workpiece support unit 3 includes a workpiece support guide rail 21, a headstock ball screw 22, a tailstock ball screw 23, a steady rest ball screw 24, a spindle stock servomotor 25, and a tailstock. Servo motor 26, steady-state servo motor 27, headstock 28, tailstock 29, and steady-state device 30.

  Two work support guide rails 21 are formed on the front side (lower side in FIG. 1) on the upper surface side of the bed 1 so as to extend in the Z-axis direction. The work support guide rail 21 is formed slightly shorter than the width of the bed 1. As shown in FIG. 3, the spindle head ball screw (spindle head driving means) 22 extends in the Z-axis direction on the left side of the bed 1 in the approximate center of the work support guide rail 21 of the bed 1. It is supported so as to be rotatable around the Z axis. The tailstock ball screw (tailstock drive means) 23 is located on the right side of the bed 1 on the right side (upper side in FIG. 1) of the work support guide rail 21 of the bed 1 in the Z-axis direction. And is supported so as to be rotatable around the Z-axis. A steady-state ball screw (stabilization drive means) 24 is arranged in the Z-axis direction on the right side of the bed 1 on the slightly front side (lower side in FIG. 1) of the work support guide rail 21 of the bed 1. It extends and is supported so as to be rotatable around the Z axis. The steady-state ball screw 24 is disposed in front of the tailstock ball screw 23.

  The headstock servomotor (headstock driving means) 25 is connected to the left end of the headstock ball screw 22 and rotatably drives the headstock ball screw 22. The tailstock servomotor (tailstock drive means) 26 is connected to the right end of the tailstock ball screw 23 and rotatably drives the tailstock ball screw 23. An anti-sway servomotor (anti-sway drive means) 27 is connected to the right end of the anti-sway ball screw 24 and drives the anti-sway ball screw 24 to be rotatable.

  As shown in FIGS. 1 to 3, the spindle stock 28 includes a spindle stock base 28a, a spindle portion 28b, a spindle (not shown), a spindle center 28c, and a spindle motor 28d. The head stock base 28 a is slidably disposed on the left side of the work support guide rail 21, and the lower side is connected to the head stock ball screw 22. In other words, the head stock base 28 a moves in the Z-axis direction along the work support guide rail 21 by the rotation of the head stock ball screw 22. The main shaft portion 28b is disposed on the upper side of the main shaft base 28a, and includes a main shaft (not shown) that can rotate around the Z axis. The main shaft is provided with a main shaft center 28c capable of supporting one end side of the workpiece W on the right end side. The main shaft motor 28d is disposed on the rear end side (left side in FIG. 1) of the main shaft, and drives the main shaft to be rotatable.

  The tailstock 29 includes a tailstock base 29a, a tailstock shaft portion 29b, a tailstock shaft (not shown), and a tailstock center 29c. The tailstock base 29 a is slidably disposed on the right side of the work support guide rail 21, and the lower side is connected to the tailstock ball screw 23. In other words, the tailstock base 29 a moves in the Z-axis direction along the work support guide rail 21 by the rotation of the tailstock ball screw 23. The tailstock base 29 a is disposed so as to face the spindle stock 28. The tailstock shaft portion 29b is disposed above the tailstock 29a and includes a tailstock shaft (not shown) that can rotate around the Z-axis. The tailstock shaft is positioned on the same axis as the main shaft included in the main shaft portion 28b. Further, the tailstock shaft includes a tailstock center 29c capable of supporting the other end side of the workpiece W on the left end side.

  The steady rest device 30 includes a steady rest base 30a and a steady rest portion 30b. The steady rest base 30a is slidably disposed between the head stock base 28a and the tailstock base 29a on the work supporting guide rail 21. This steady rest base 30a is formed to have the same width in the X-axis direction as the headstock base 28a and the tailstock base 29a, and all of the steady rest base 30a is an intermediate region between the headstock base 28a and the tailstock base 29a. It is arranged. The lower side of the steadying base 30 a is connected to the steadying ball screw 24. In other words, the steadying base 30 a moves in the Z-axis direction along the work support guide rail 21 by the rotation of the steadying ball screw 24. The steadying portion 30b is disposed on the top side of the steadying base 30a, and is disposed on the opposite side of the grinding wheel bases 10a and 10b with the workpiece W interposed therebetween. The steady rest 30b supports the intermediate part of the workpiece W during grinding. That is, the intermediate portion of the workpiece W is supported by the steady rest portion 30b, thereby preventing the workpiece W from being bent during grinding.

(Operation of the machine tool of the first embodiment)
Next, operation | movement of the grinding machine in 1st Embodiment which consists of the above structures is demonstrated. First, the steady rest device 30 is positioned in the Z-axis direction. The positioning of the steadying device 30 is performed by rotational driving of the steadying servo motor 27. Subsequently, the distance between the spindle stock 28 and the tailstock 29 is increased in order to dispose the workpiece W. That is, the head stock 28 is moved to the left side in FIG. 1, and the tailstock 29 is moved to the right side in FIG. This operation is performed by rotational driving of the spindle head servomotor 25 and the tailstock servomotor 26. Subsequently, the workpiece W is disposed between the spindle stock 28 and the tailstock 29, and the workpiece W is sandwiched between the spindle center 28c and the tailstock center 29c. That is, it is performed by moving the spindle stock 28 and the tailstock 29 so as to reduce the distance between the spindle stock 28 and the tailstock 29. At this time, the headstock 18 and the tailstock 29 are moved so that the position of the workpiece W supported by the steady rest device 30 and the position of the steady rest device 30 coincide with each other. Subsequently, grinding is performed by moving the grindstones 11a and 11b while rotating the workpiece W by rotating the spindle motor 28d. Furthermore, when grinding the next workpiece W, the spindle head 28 and the tailstock 29 are moved so that the distance between the spindle stock 28 and the tailstock 29 is increased, and the workpiece W is replaced. At this time, the steady rest device 30 is in a fixed state.

  Further, when the workpiece length of the workpiece W is very long, the grinding machine of the first embodiment is operated as follows. First, the steady rest device 30 is positioned in the Z-axis direction. Subsequently, the spindle stock 28 and the tailstock 29 are moved so that the distance between the spindle stock 28 and the tailstock 29 is maximized. That is, the head stock 28 is moved to the left end side in FIG. 1, and the tailstock 29 is moved to the right end side in FIG. Subsequently, the workpiece W is disposed between the spindle stock 28 and the tailstock 29, and the workpiece W is sandwiched between the spindle center 28C and the tailstock center 29c. That is, it is performed by moving the spindle stock 28 and the tailstock 29 so as to reduce the distance between the spindle stock 28 and the tailstock 29. However, when the work length is very long, the headstock 28 and the tailstock 29 cannot be moved so much. Therefore, the position of the workpiece W supported by the steady rest device 30 and the position of the steady rest device 30 may not match. In this case, the steadying device 30 is moved so that the position of the steadying device 30 and the position of the work W supported by the steadying device 30 coincide. Subsequently, grinding is performed by moving the grindstones 11a and 11b while rotating the workpiece W by rotating the spindle motor 28d.

(2) 2nd Embodiment Next, the machine tool provided with the steadying apparatus in 2nd Embodiment is demonstrated. The machine tool provided with the steady rest in the second embodiment is a grinding machine in which the headstock, tailstock and steady rest are arranged on the same guide rail. More specifically, only the headstock and the tailstock can move on the guide rail, and the steadying device is fixed on the guide rail. That is, the machine tool in the second embodiment is different from the machine tool in the first embodiment described above in that the steady rest device is fixed. Below, with reference to FIG. 4, the machine tool in 2nd Embodiment is explained in full detail. FIG. 4 is a schematic diagram of a workpiece support portion of a machine tool according to the second embodiment.

(Overall configuration of the machine tool of the second embodiment)
The machine tool in 2nd Embodiment has the bed 1 which consists of a substantially rectangular parallelepiped like the machine tool in 1st Embodiment. The bed 1 is divided into a grindstone support portion 2 which is the back side of the bed 1 and a work support portion 40 which is the front side of the bed 1. In addition, since the grindstone support part 2 is the same as the grindstone support part 2 in 1st Embodiment, description is abbreviate | omitted. Therefore, only the workpiece support 40 will be described. In addition, about the same structure as the machine tool in 1st Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

(Configuration of the work support unit 40 of the second embodiment)
The workpiece support 40 will be described with reference to FIG. The work support unit 40 includes a work support guide rail 21, a headstock ball screw 22, a tailstock ball screw 41, a headstock servomotor 25, a tailstock servomotor 42, and a headstock. 28, a tailstock 29, and a steady rest device 43.

  A tailstock ball screw (tailstock drive means) 41 extends in the Z-axis direction and rotates about the Z-axis on the right side of the bed 1 in the center of the work support guide rail 21 of the bed 1. It is supported freely. The tailstock servomotor (tailstock drive means) 42 is connected to the right end of the tailstock ball screw 41 and rotatably drives the tailstock ball screw 41. The tailstock ball screw 41 is connected to the lower side of the tailstock base 29a.

  The steady rest device 43 includes a steady rest base 43a and a steady rest portion 43b. The steady rest base 43 a is fixed between the head stock base 28 a and the tailstock base 29 a on the work support guide rail 21. The steady rest base 43a is formed to have the same width as the X-axis direction of the headstock base 28a and the tailstock base 29a, and all of the steady rest base 43a is an intermediate region between the headstock base 28a and the tailstock base 29a. It is arranged. The steadying portion 43b is disposed on the upper side of the steadying base 43a, and is disposed on the opposite side of the grinding wheel bases 10a and 10b with the workpiece W interposed therebetween. This steadying portion 43b supports the intermediate portion of the workpiece W during grinding. That is, the intermediate portion of the workpiece W is supported by the steady stop portion 43b, thereby preventing the workpiece W from being bent during grinding.

(Operation of the machine tool of the second embodiment)
The operation of the machine tool of the second embodiment is exactly the same except that the steady rest does not move in the machine tool of the first embodiment described above.

(3) 3rd Embodiment Next, the machine tool provided with the steadying apparatus in 3rd Embodiment is demonstrated. The machine tool provided with the steady rest in the third embodiment is a grinding machine in which the headstock, the tailstock and the steady rest are movably disposed on the respective guide rails. Further, the grinding machine is provided with a part of the steady rest device in an intermediate region between the headstock and the tailstock. Below, with reference to FIG. 5, the machine tool in 3rd Embodiment is explained in full detail. FIG. 5 is a schematic diagram of a workpiece support portion of a machine tool according to the third embodiment.

(Overall configuration of the machine tool of the third embodiment)
The machine tool in the third embodiment has a bed 51 made of a substantially rectangular parallelepiped like the machine tool in the first embodiment. The bed 51 is divided into a grindstone support portion 2 which is the back side of the bed 51 and a work support portion 52 which is the front side of the bed 51. In addition, since the grindstone support part 2 is the same as the grindstone support part 2 in 1st Embodiment, description is abbreviate | omitted. Therefore, only the workpiece support 52 will be described. In addition, about the same structure as the machine tool in 1st Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

(Configuration of the work support portion 52 of the third embodiment)
The workpiece support 40 will be described with reference to FIG. The work support 52 includes a headstock guide rail 53, a tailstock guide rail 54, a steady rest guide rail 55, a headstock ball screw 56, a tailstock ball screw 57, and a steady rest. A ball screw 58, a headstock servomotor 59, a tailstock servomotor 60, a steadying servomotor 61, a headstock 28, a tailstock 29, and a steadying device 62. The

  Two headstock guide rails 53 are formed on the left side of the front side (lower side in FIG. 1) of the bed 51 so as to extend in the Z-axis direction. The headstock guide rail 53 is formed slightly shorter than the width of the bed 51. Two tailstock guide rails 54 are formed on the right side of the front side of the upper surface of the bed 51 so as to extend in the Z-axis direction. The tailstock guide rail 54 is formed on an extension line of the headstock guide rail 53. The tailstock guide rail 54 is formed shorter than the width of the bed 51. The steady rest guide rail 55 extends in the Z-axis direction substantially in the middle of the front side of the upper surface of the bed 51, that is, between the headstock guide rail 53 and the tailstock guide rail 54. One is formed. The length of the steady rest guide rail 55 is much shorter than the length of the headstock guide rail 53 and the tailstock guide rail 54.

  As shown in FIG. 5, the headstock ball screw (spindle head drive means) 56 extends in the Z-axis direction at the center of the headstock guide rail 53 of the bed 1 and is rotatable about the Z-axis. It is supported. The length of the head stock ball screw 56 in the longitudinal direction is substantially the same as the length of the guide stock 53 for the head stock. The tailstock ball screw (tailstock driving means) 57 extends in the Z-axis direction and is supported so as to be rotatable about the Z-axis at the center of the tailstock guide rail 54 of the bed 1. . The length of the tailstock ball screw 57 in the longitudinal direction is substantially the same as the length of the tailstock guide rail 54. The steady-state ball screw (anti-rest driving means) 58 extends in the Z-axis direction on the right side of the bed 1 on the front side (lower side in FIG. 5) of the steady-state guide rail 55 of the bed 1. It is supported so as to be rotatable around the Z axis. The length of the steady-state ball screw 58 in the longitudinal direction is substantially the same as the length of the steady-state guide rail 55.

  The headstock servomotor (headstock driving means) 59 is connected to the left end of the headstock ball screw 56 and drives the headstock ball screw 56 to be rotatable. The tailstock servomotor (tailstock drive means) 60 is connected to the right end of the tailstock ball screw 57 and drives the tailstock ball screw 57 to be rotatable. An anti-sway servomotor (anti-sway drive means) 61 is connected to the right end of the anti-sway ball screw 58 and drives the anti-sway ball screw 58 to be rotatable.

  The headstock base 28 a of the headstock 28 is slidably disposed on the headstock guide rail 53, and the lower side is connected to the headstock ball screw 56. In other words, the headstock base 28 a moves in the Z-axis direction along the headstock guide rail 53 by the rotation of the headstock ball screw 56. The tailstock base 29 a of the tailstock 29 is slidably disposed on the tailstock guide rail 54, and the lower side is connected to the tailstock ball screw 57. In other words, the tailstock base 29 a is moved in the Z-axis direction along the tailstock guide rail 54 by the rotation of the tailstock ball screw 57.

  The steadying device 62 includes a steadying base 62a and a steadying unit 62b. The steadying base 62a is slidably disposed on the steadying guide rail 55. The steady rest base 62a is formed to be smaller than the X-axis direction width of the head stock base 28a and the tailstock base 29a, and a part of the steady rest base 62a is located in an intermediate region between the head stock base 28a and the tailstock base 29a. It is arranged. The lower side of the steadying base 62a is connected to the steadying ball screw 58. In other words, the steadying base 62 a moves in the Z-axis direction along the steadying guide rail 55 by the rotation of the steadying ball screw 58. The steadying part 62b is arranged on the upper side of the steadying base 62a, and is arranged on the opposite side of the grinding wheel bases 10a and 10b with the workpiece W interposed therebetween. The steady rest 62b supports the intermediate part of the workpiece W during grinding. That is, the intermediate portion of the workpiece W is supported by the steady stop portion 62b, thereby preventing the workpiece W from being bent during grinding.

(4) 4th Embodiment Next, the machine tool provided with the steadying apparatus in 4th Embodiment is demonstrated. In the machine tool provided with the steady rest in the fourth embodiment, the headstock and the tailstock are movably disposed on the respective guide rails, and the steady rest is fixed between the guide rails. It is a grinding machine. That is, the machine tool in the fourth embodiment is different from the machine tool in the third embodiment described above in that the steady rest device is fixed. Below, with reference to FIG. 6, the machine tool in 4th Embodiment is explained in full detail. FIG. 6 is a schematic diagram of a workpiece support portion of a machine tool according to the fourth embodiment.

(Whole structure of the machine tool of the fourth embodiment)
The machine tool in the fourth embodiment has a bed 51 made of a substantially rectangular parallelepiped like the machine tool in the third embodiment. The bed 51 is divided into a grindstone support portion 2 which is the back side of the bed 51 and a work support portion 71 which is the front side of the bed 51. In addition, since the grindstone support part 2 is the same as the grindstone support part 2 in 1st Embodiment, description is abbreviate | omitted. Therefore, only the workpiece support portion 71 will be described. In addition, about the same structure as the machine tool in 1st Embodiment and 3rd Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

(Structure of the work support part 71 of 4th Embodiment)
The workpiece support 71 will be described with reference to FIG. The work support 71 includes a headstock guide rail 53, a tailstock guide rail 54, a headstock ball screw 56, a tailstock ball screw 57, a headstock servomotor 59, a tailstock. The table servomotor 60, the headstock 28, the tailstock 29, and the steadying device 72 are configured. That is, the work support portion 71 of the fourth embodiment is configured such that the steadying guide rail 55, the steadying ball screw 58, and the steadying servomotor 61 in the workpiece support unit 62 of the third embodiment are not present. It is.

  The steady rest device 71 includes a steady rest base 71a and a steady rest portion 71b. The steady rest base 71a is formed smaller than the X-axis direction width of the head stock base 28a and the tailstock base 29a. The steady rest base 71 a is fixed to the upper surface side of the bed 51 and between the headstock guide rail 53 and the tailstock guide rail 54. More specifically, a part of the steady rest base 71a is disposed in an intermediate region between the head stock base 28a and the tailstock base 29a. The steadying portion 71b is disposed on the upper side of the steadying base 71a, and is disposed on the opposite side of the grinding wheel bases 10a and 10b with the workpiece W interposed therebetween. This steadying portion 71b supports the intermediate portion of the workpiece W during grinding. That is, the intermediate portion of the workpiece W is supported by the steady rest portion 71b, thereby preventing the workpiece W from being bent during grinding.

(5) Modification of Fourth Embodiment Next, a modification of the fourth embodiment will be described. In the fourth embodiment, a part of the steadying base 71a of the steadying device 71 is disposed in the intermediate region between the headstock base 28a and the tailstock base 29a. However, the present invention is not limited to this. For example, all of the steady rests 71a of the steady rest 71 may not be disposed in the intermediate region between the head stock base 28a and the tailstock base 29a. In other words, the steady rest base 71 a is fixed to the near side of the front headstock guide rail 53 and the tailstock guide rail 54. If it does in this way, the distance from the position where the steadying part 71b is being fixed to the steadying base 71a to the workpiece | work W will become long, but since it is being fixed to the bed 51 compared with the conventional steadying apparatus, the steadying The rigidity of the stopping device 71 is improved.

It is a top view of the machine tool in a 1st embodiment. It is a front view of the machine tool in a 1st embodiment. It is a schematic diagram of the workpiece | work support part of the machine tool in 1st Embodiment. It is a schematic diagram of the workpiece | work support part of the machine tool in 2nd Embodiment. It is a schematic diagram of the workpiece | work support part of the machine tool in 3rd Embodiment. It is a schematic diagram of the workpiece | work support part of the machine tool in 4th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,51: Bed, 2: Whetstone support part, 3,40,52,71: Work support part, 4: Z-axis guide rail for whetstones, 5a, 5b: Z-axis ball screw for whetstones, 6a, 6b: For whetstones Z-axis servo motor, 7a, 7b: grinding wheel table, 8a, 8b: grinding wheel X-axis ball screw, 9a, 9b: grinding wheel X-axis servo motor, 10a, 10b: grinding wheel base, 11a, 11b: grinding wheel, 21: Guide rails for workpiece support, 22, 56: Spindle head ball screw (spindle head driving means), 23, 41, 57: Tailstock ball screw (tailstock driving means), 24, 58: Stabilizing ball Screws (stabilization drive means), 25, 59: headstock servomotor (spindle table drive means), 26, 42, 60: tailstock servomotor (tailstock drive means), 27, 61: steady rest Servo motor 28: spindle head base, 28a: spindle head base, 28b: spindle part, 28c: spindle center, 28d: spindle motor, 29: tailstock, 29a: tailstock base, 29b: Tailstock shaft part, 29c: Tailstock center, 30, 43, 62: Stabilization device, 30a, 43a, 62a: Stabilization base, 30b, 43b, 62b: Stabilization part, 53: Guide rail for headstock, 54 : Guide rail for tailstock, 55: guide rail for steady rest

Claims (6)

Bed and
A headstock having a headstock base disposed on the bed, and a main spindle portion which is disposed on the headstock base and is capable of rotating and supporting one end side of a substantially bar-shaped work around the axis of the work;
A tailstock base disposed and disposed on the bed so as to face the headstock, and the other end of the workpiece disposed on the tailstock base can be rotatably supported around the workpiece axis. A tailstock having a tailstock portion;
A tool table disposed on the bed that supports a tool and is movable with respect to the bed in an axial direction and an orthogonal direction of the workpiece;
At least a part of the steady rest base disposed in the intermediate region between the headstock base and the tailstock base on the bed, and the steady rest portion disposed on the steady rest base and supporting the intermediate portion of the workpiece. A steady rest device comprising:
A headstock driving means for driving the headstock in the axial direction of the workpiece with respect to the bed;
A tailstock driving means for driving the tailstock in the axial direction of the workpiece with respect to the bed;
Equipped with a,
The steady rest is fixed on the bed,
The headstock driving means positions and drives the headstock to the work support position by the head stock determined based on the work support position and the work shape by the steady rest device,
The tailstock driving means positions and drives the tailstock to a support position of the work by the tailstock determined based on a support position of the work by the steadying device and a shape of the work. A machine tool equipped with a steady rest. Bed and
A headstock having a spindle portion that can be rotatably supported around the axis of the workpiece on one end side of the workpiece that is disposed on the bed and has a substantially rod shape;
A tailstock having a tailstock portion disposed on the bed so as to face the headstock and capable of rotating and supporting the other end of the work around the axis of the work;
A tool table disposed on the bed that supports a tool and is movable with respect to the bed in an axial direction and an orthogonal direction of the workpiece;
An anti-sway device that is fixedly disposed between the headstock and the tailstock on the bed and supports an intermediate part of the workpiece,
A headstock driving means for driving the headstock in the axial direction of the workpiece with respect to the bed;
A tailstock driving means for driving the tailstock in the axial direction of the workpiece with respect to the bed;
Equipped with a,
The headstock driving means positions and drives the headstock to the work support position by the head stock determined based on the work support position and the work shape by the steady rest device,
The tailstock driving means positions and drives the tailstock to a support position of the work by the tailstock determined based on a support position of the work by the steadying device and a shape of the work. A machine tool equipped with a steady rest.   The bed has a guide rail formed in the axial direction of the workpiece,
  The machine tool provided with the steady rest device according to claim 1, wherein the headstock and the tailstock are slidable on the same guide rail.   The machine tool provided with the steady rest device according to claim 3, wherein the steady rest device is disposed on the guide rail.   The tool is a grindstone,
  The tool table rotatably supports the grindstone,
  The machine tool provided with the steady rest device according to claim 1, wherein the machine tool is a grinding machine.   The machine tool provided with the steady rest device according to claim 1, wherein the workpiece is a crankshaft or a camshaft.

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