JP2008126371A - Machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a machine tool capable of performing an evacuation operation of a tool rest to a tool change position and an approach operation of the other tool rest to a machining starting position at the same time without causing the interference of the tools and capable of reducing a machining time. <P>SOLUTION: This machine tool includes: a main spindle 12; a first tool rest 15 and a second tool rest 17 which are positioned opposite to each other across an axis of the main spindle 12; and a first drive unit and a second drive unit which independently drive the tool rests 15 and 17 along a direction orthogonal to the axis of the main spindle 12. There is also provided a speed value setting device which sets a speed value for each drive unit. The speed value setting device sets the same speed value for both drive units according to a speed value unification command, e.g., in an approach operation of the tool rest 15 or 17 and an evacuation operation of the other tool rest 17 or 15. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention includes a pair of tool rests that are independently moved in a direction perpendicular to the axis of the main spindle, selects tools mounted on those tool rests, and uses the selected tool to apply a work on the main spindle. The present invention relates to a machine tool that performs machining.

In this type of machine tool, Patent Document 1 proposes the following configuration. That is, in the configuration of this Patent Document 1, as shown in FIG. 7, the work 42 is held by the chuck 43 at the tip of the main shaft 41 and the like extending in the Z-axis direction. In the vicinity of the main shaft 41, a first tool post 44 and a second tool post 45 are arranged to face each other so as to be independently movable in the X-axis direction orthogonal to the axis of the main shaft 41. Then, the tools 44a and 45a mounted on the first tool post 44 and the second tool post 45 are selected, and the workpiece 42 on the spindle 41 is processed by the selected tools 44a and 45a. The In this case, when the tools 44a and 45a used for machining are switched, during the machining of the workpiece 42 by the tools 44a and 45a on any one of the tool rests 44 and 45, the other tool rests 45 and 44 next. The tools 45a and 44a to be used are selected and positioned at the standby position with respect to the workpiece 42. As described above, the next tool to be used is positioned in the standby position in advance, so that the next machining can be immediately performed and the machining time is shortened.
Japanese Unexamined Patent Publication No. 63-278738

  In the above case, the tool rests 44, 45 are located at positions where the tools 44a, 45a on the tool rests 44, 45 do not interfere with the work 42, and at the positions where the tools 44a, 45a on the tool rests 44, 45 do not interfere with each other. The standby position is set. For example, when the processing of the workpiece 42 by the first tool post 44 is completed, the first tool post 44 is retracted from the processing end position, and the second tool post 45 is moved from the standby position to the processing start position. Moved. In this case, if the speed values such as the rapid feed speed and rapid feed time constant (acceleration) of the tool rests 44 and 45 are different, the interval between the tools 44a and 45a on the tool rests 44 and 45 cannot be secured. There is a possibility that the tools 44a and 45a interfere with each other. In order to avoid such a problem, it is necessary to move the second tool post 45 to the machining start position after retracting the first tool post 44. That is, the first tool post 44 and the second tool post 45 cannot be moved at the same time, and it is necessary to move them separately with a time difference. Therefore, a time loss due to tool switching occurs, and the processing time cannot be shortened.

  The present invention has been made paying attention to such problems existing in the prior art. The purpose is that the tool interferes with the retraction operation from the tool end position of the tool post to the tool switching position and the intrusion operation (hereinafter referred to as the approach operation) from the standby position of another tool post to the processing start position. An object of the present invention is to provide a machine tool that can be performed simultaneously and can reduce the machining time.

  In order to achieve the above object, the present invention provides a first tool post that is provided so as to be movable between a spindle supporting a workpiece and a machining position and a retracted position along a direction orthogonal to the axis of the spindle. And a first driving means for driving the first tool post, and a machining position and a retracted position along a direction orthogonal to the axis of the main spindle at a position facing the first tool post across the axis of the main spindle. Second turret provided to be movable between the second turret, second driving means for driving the second turret, and speed value settings for setting speed values of the first turret and the second turret, respectively. And control means for controlling the operations of the first and second driving means separately so that the first and second tool rests are moved according to the speed value set by the speed value setting means. The speed value setting means follows a speed value unification command. The first, and sets a speed value of the second driving means to the same value.

  Therefore, according to the present invention, for example, after the processing by the first or second tool post is completed, the first or second tool post is retracted from the processing end position to the retracted position, and at the same time, the second or second tool post is retracted. One turret is moved from a predetermined standby position or retracted position to a machining start position at the same speed value as the retracting operation. For this reason, operation | movement of both tool rests can be performed simultaneously, without the tools on those tool rests interfering. Therefore, the next machining can be started immediately, and the machining time can be shortened.

  And in this invention, the speed value setting means in the approach operation of one of the first turret and the second turret in the switching of the tool, and the retracting operation of the other turret, The speed values of the first driving means and the second driving means are set to the same value.

  In the above-described configuration, the speed value setting means includes the speed values of the first driving means and the second driving means in a normal operation, and the first driving means and the second driving means in a tool switching approach operation and a retracting operation. Storage means for storing the speed value is provided. When configured in this way, the speed values of the first drive means and the second drive means for driving the first tool post and the second tool post are easily obtained based on the speed values stored in the storage means. Can be set.

  The said structure WHEREIN: The said speed value setting means sets the speed value for performing tool switching by rapid feed, It is characterized by the above-mentioned. When comprised in this way, the rapid feed speed value of a 1st tool post and a 2nd tool post can be set, and processing time can be shortened further.

  In the above-described configuration, the speed value setting means releases the speed values of the first driving means and the second driving means from the same value setting state in accordance with a setting value restoration command. In such a configuration, after the retracting operation of the tool post and the approach operation of another tool post are simultaneously performed at the same speed value, the speed value of each driving means is set from the setting state where the same value is set. Restored to default state. Therefore, after this speed value is restored, the independent operation of the first tool post and the second tool post can be performed at the predetermined speed value to maximize the capabilities of the machine, further reducing the machining time. can do.

  As described above, according to the present invention, the retracting operation of one turret to the tool switching position and the approaching operation of the other turret to the machining start position can be performed at the same time without interfering with the tool. In addition to the effects such as being able to shorten the processing time.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, in the machine tool of this embodiment, a spindle 12 is supported on a spindle stock 11 so as to be rotatable about an axis Z <b> 1 extending in the Z-axis direction. A workpiece 13 is detachably held on the spindle 12 by a chuck 14. A first tool post 15 is disposed in the vicinity of the main shaft 12 so as to be movable in the Z-axis direction and the X-axis direction orthogonal to the Z-axis. The first tool post 15 is pivoted about an axis Z2 extending in parallel with the axis Z1 of the main shaft 12, and is indexed. The first tool post 15 is a turret tool post, and a plurality of types of first tools 16 including a drilling tool 16 a are mounted on the outer periphery of the first tool post 15.

  A second tool post 17 is disposed in the vicinity of the main shaft 12 so as to be movable in the Z-axis direction and the X-axis direction orthogonal to the Z-axis at a position facing the first tool post 15 across the axis Z1. . The second tool post 17 is pivoted about an axis Z3 extending in parallel with the axis Z1 of the main shaft 12, and is indexed. The second tool post 17 is a turret tool post, and a plurality of types of second tools 18 including a drilling tool 18a are mounted on the outer periphery thereof. The positions of the first and second tool rests 15 and 17 may be interchanged on the drawing.

  Next, a control device for controlling the operation of the machine tool having the above configuration will be described. As shown in FIG. 3, the control device 21 includes a CPU 22, a ROM 23, a RAM 24, an input unit 25, a display unit 26, a spindle rotation control circuit 27, a first tool selection control circuit 28, a first tool feed control circuit 29, A two-tool selection control circuit 30 and a second tool feed control circuit 31 are provided. The input unit 25 is composed of a keyboard having numeric keys and the like. The operator inputs the type of workpiece 13, data on the outer diameter, the types of tools 16 and 18 to be used, and the like from this input unit. The display unit 26 includes a display device such as a liquid crystal display. Data or the like input from the input unit 25 is displayed on the display unit 26. Here, the CPU 22 and the RAM 24 constitute speed value setting means for setting the speed values of the first tool rest 15 and the second tool rest 17, respectively. Further, the CPU 22, ROM 23, and RAM 24 have a first tool feed driving device 34 and a second tool feed driving device, which will be described later, so that the first and second tool rests 15, 17 are moved according to the set speed value. The control means which controls 36 operation | movement separately is comprised.

  The CPU 22 outputs control signals to the spindle rotation control circuit 27, the first tool selection control circuit 28, the first tool feed control circuit 29, the second tool selection control circuit 30, and the second tool feed control circuit 31. Then, under the control of the control circuits 27 to 31, the spindle rotation driving device 32, the first tool selection driving device 33, the first tool feed driving device 34, the second tool selection driving device 35, and the second made of a driving motor or the like. The spindle 12, the first tool post 15 and the second tool post 17 are operated via the tool feed driving device 36. Here, the first tool feed driving device 34 constitutes a first driving means for driving the first tool post 15 in a direction orthogonal to the axis Z1 of the main shaft 12. Further, the second tool feed driving device 36 constitutes a second drive means for driving the second tool post 17 in a direction perpendicular to the axis Z1 of the main shaft 12 independently of the first tool feed driving device 34. ing.

  The ROM 23 stores a basic program for operating the machine tool of this embodiment. The RAM 24 stores a control program including the NC program shown in FIGS. 4 (a) and 4 (b). By this control program, the tools 16 and 18 on the tool rests 15 and 17 are selected, and various types of processing are performed on the workpiece 13. When the control program for the tool rests 15 and 17 stored in the RAM 24 is executed, the first tool rest 15 and the second tool rest 17 by the first tool feed driving device 34 and the second tool feed driving device 36 are used. The rapid feed speed value in the X-axis direction is set. Here, the rapid feed speed value indicates time constants of fast feed speed and acceleration in the X-axis direction of the first tool post 15 and the second tool post 17. Here, acceleration includes deceleration and acceleration includes jerk. The fast-forward speed value data is stored in the RAM 24 as storage means, as will be described later.

  The NC program shown in FIG. 4A constituting the machining control program operates the first tool feed driving device 34 via the first tool feed control circuit 29 to approach and retract the first tool post 15. Etc., to operate alone. Similarly, the NC program of FIG. 4B, which constitutes the control program, operates the second tool feed driving device 36 via the second tool feed control circuit 31 to approach and retract the second tool post 17. Operate alone. In the approach operation to the machining start position of the tool post 15 or the tool post 17 according to the control program and the retracting operation of the tool post 17 or the tool post 15, when the speed value unification command M500 exists, the CPU 22 In accordance with the unified command M500, the rapid feed speed values of the first tool feed drive device 34 and the second tool feed drive device 36 are set to the same value. Further, when the set value restoration command M600 exists at the end of the approach operation of the tool post 15 or the tool post 17 and the retracting operation of the tool post 17 or the tool post 15 according to the control program, the CPU 22 restores the set value. In response to the command M600, the rapid feed speed values of the first tool feed drive device 34 and the second tool feed drive device 36 are canceled from the same value setting state and restored to the default value setting state.

  That is, the RAM 24 performs rapid feed speed values of the first tool feed drive device 34 and the second tool feed drive device 36 in normal operation, and rapid feed of the first tool feed drive device 34 and the second tool feed drive device 36 in tool switching. Each speed value is stored. Here, the normal operation refers to the movement of the first and second tool rests 15 and 17 without tool switching. Then, the CPU 22 compares the fast feed speeds of the first tool post 15 and the second tool post 17 at the time of tool switching, and stores the smaller value in the predetermined data area of the RAM 24 as the tool feed fast feed speed of the same value. Let Further, the CPU 22 compares the fast feed time constants of the first tool post 15 and the second tool post 17 at the time of tool switching, and uses the larger value as the fast feed time constant for tool change of the same value in a predetermined data area of the RAM 24. Remember me.

  Next, an example of the operation of the machine tool configured as described above will be described in accordance with the control program shown in FIGS. 4A and 4B and the flowcharts shown in FIGS. The operation of the machine tool is realized by the basic program stored in the ROM 23 and the machining control program stored in the RAM 24 being advanced under the control of the CPU 22.

  When the control program is executed in this machine tool, on the first tool post 15 side shown in FIG. 4A, the first tool post 15 is indexed by the commands T100 and G00 in step P1-1 in the control program. Is done. By this indexing, a drilling tool (drill) 16a having a tool number 100 is selected from the first tool 16 on the first tool post 15, and the drilling tool 16a is positioned at the coordinate positions of X0 and Z20.0. . Here, X0 indicates the axis of the workpiece 13, that is, the center. Z20.0 indicates the start position of the machining operation in which the tip of the first tool 16 is separated from the tip surface of the workpiece 13 by a very small distance in the Z-axis direction. In the next step P1-2, based on the command G01, the first tool 16 moves forward, and the workpiece 13 is punched to a depth of 15.5 mm. In this case, the first tool 16 is cut and fed at the feed rate indicated by the command F0.1. Next, based on the command G00, the first tool 16 moves backward to the start position of the machining operation.

  Subsequently, in Step P1-3, the command M500 as the speed value unification command proceeds to the speed unification routine shown in FIG. 5A, and the rewriting process of the fast feed speed and fast feed time constant and the waiting process are performed. Is called. This routine will be described later.

  On the other hand, in the control program on the second tool post 17 side shown in FIG. 4B, the second tool post 17 is indexed by the command T1100 in step P2-1. By this indexing, the drilling tool 18a with the tool number 1100 is selected from the second tool 18 on the second tool post 17, and the drilling tool 18a is set to the coordinate position of X40.0 and Z20.0 by the command G00. Wait. The operation of Step P2-1 is performed during the execution of Step P1-1 to Step P1-3 in the control program on the first tool post 15 side shown in FIG. That is, since the waiting is commanded to the next step P2-2, the second tool post 17 maintains the standby position while the first tool post 15 side executes steps P1-1 to P1-3.

  Subsequently, in accordance with the command M500 as the speed value unification command in Step P2-2, the routine proceeds to the routine shown in FIG. 5B, and rewriting processing of the fast feed speed and fast feed time constant of the second tool post 17 is performed. A meeting is done.

A routine according to the command M500 will be described in detail with reference to the flowcharts of FIGS. 5 (a) and 5 (b).
As shown in FIG. 5A, when executing the command M500 in the control program on the first tool post 15 side, in step (hereinafter simply referred to as S) 1, the rapid feed speed of the first tool post 15 in the X-axis direction is Rewritten from the default value to the rapid traverse speed for tool switching. In this case, as the fast-forwarding speed for tool switching, the smaller value is compared in advance with the predetermined data area of the RAM 24 by comparing the approach and retraction fast-forwarding speeds in the first tool post 15 and the second tool post 17 at the time of tool switching. Is remembered. In the next S2, the rapid feed time constant in the X-axis direction of the first tool post 15 is rewritten from the default value to the fast feed time constant for tool switching. In this case, as a fast-forwarding time constant for tool switching, the larger value is compared with the predetermined data in the RAM 24 by comparing the approach and the fast-forwarding time constants for retraction in the first tool post 15 and the second tool post 17 at the time of tool switching. It is stored in the area.

  Subsequently, in S3, the completion of the rewriting process of the fast feed speed and fast feed time constant on the first tool post 15 side is output to the second tool post 17 side. Furthermore, in S4, whether or not the rewriting process of the fast feed speed and fast feed time constant in the X-axis direction of the second tool post 17 is completed according to the speed value unification command M500 of the control program on the second tool post 17 side. Determined. If the rewriting process on the second tool rest 17 side is not completed, the control program on the first tool rest 15 side waits for the completion of the rewriting process and when the rewriting process on the second tool rest 17 side is completed. The processing operation of the speed value unification command M500 is completed.

  On the other hand, as shown in FIG. 5B, even when the speed value unification command M500 in the control program on the second tool post 17 side is executed, the speed value unification command M500 in the control program on the first tool post 15 side described above. A processing operation similar to that at the time of execution is performed. That is, corresponding to S1 to S4 in the flowchart of FIG. 5A, the first tool post 17 side is also the first as shown by the reference numerals S1a to S4a in the flowchart of FIG. 5B. Similar to the turret 15 side, the rewriting process of the rapid feed speed in the X-axis direction, the rewriting process of the fast feed time constant, the output of the completion of the rewriting process to the first turret 15 side, and the first turret 15 side Each operation waiting for completion of the rewriting process is performed.

  Therefore, the first tool post 15 side and the second tool post 17 side wait for each other until the rewriting process of the fast feed speed and fast feed time constant in the X-axis direction by the speed value unification command M500 is completed. When the rewriting process is completed on the both tool rests 15 and 17 side, step P1-4 in the control program on the first tool rest 15 side shown in FIG. 4A and the second shown in FIG. The operation with step P2-3 in the control program on the tool post 17 side is started simultaneously.

  Then, in step P1-4 in the control program on the first tool post 15 side in FIG. 4A, the first tool post 15 is moved from the machining end position to the tool switching position at the coordinate X130.0 in accordance with the command G00. The direction is retracted at the acceleration of the rapid traverse speed and rapid traverse time constant rewritten in steps S1 and S2. That is, the first tool post 15 is retracted 130 mm in the X-axis direction at the rewritten rapid feed speed and rapid feed time constant acceleration. At the same time, in step P2-3 in the control program on the second tool post 17 side in FIG. 4B, the second tool post 17 corresponds to the coordinate position of X0 from the standby position, that is, the center of the workpiece 13, according to the command G00. The approach operation is performed at the machining start position in the X-axis direction with the rapid feed speed and the acceleration of the time constant according to the steps S1a and S2a, that is, with the fast feed speed and the rapid feed time constant acceleration that are the same as those of the first tool post 15. In this case, since the second tool post 17 is disposed at a position 40 mm away from the axis of the workpiece 13 in Step P2-1, the amount of movement in the approach of the second tool post 17 is 40 mm.

  As described above, in the case of tool switching, since the rapid feed speed and rapid feed time constant in the X-axis direction of the first tool post 15 and the second tool post 17 are set to the same value, the first tool post 15 and the second tool post 15 Even if the tool post 17 is moved simultaneously, there is no possibility that the tools 16 and 18 on the tool post 15 and 17 interfere with each other.

  Next, in step P1-5 in the control program of FIG. 4A, the set value restoration command M600 is used to shift to the routine shown in FIG. 6A to restore the fast feed speed and fast feed time constant set values. Is called. That is, as shown in S10 of the flowchart of FIG. 6A, the fast feed speed and fast feed time constant in the X-axis direction of the first tool post 15 rewritten by the speed value unification command M500 are restored to the default values. . Therefore, in the fast-forward operation in the X-axis direction of the first tool post 15 after the tool switching operation, the machine capability can be maximized and the machining time can be shortened.

  Subsequently, in Step P1-6, the tool 16 having the tool number 200 is selected in the first tool post 15, and the tool 16 is on standby at the required coordinate position in the X-axis direction and coordinate position in the Z-axis direction. This standby operation is performed in parallel with the execution of step P2-5 in the control program on the second tool post 17 side in FIG.

  On the other hand, Step P2-4 in the control program on the second tool post 17 side in FIG. 4B is the same as Step P1-5 in the control program on the first tool post 15 side in FIG. In addition, the setting value restoration command M600 restores the setting of the fast-forward speed and the fast-forward time constant. That is, as shown in S10a of the flowchart of FIG. 6B, the fast feed speed and fast feed time constant in the X-axis direction of the second tool rest 17 rewritten according to the previous speed value unification command M500 are canceled, and the default Restored to value. Then, in the next step P2-5, while the main shaft 12 is rotated, the drilling tool 18a on the second tool post 17 can be drilled at a machining feed rate of F0.1 to obtain a drilling depth of 15.5 mm. After being moved in the axial direction, it is returned to the movement start position.

The machine tool of this embodiment configured as described above exhibits the following effects.
(1) When the control program is executed, one tool post 15 or 17 is approached from the standby position to the machining start position, and at the same time, the other tool post 17 or 15 is retracted from the machining end position to the tool switching position. In this case, in accordance with the speed value unification command M500, the rapid feed speed and rapid feed time constant in the X-axis direction of both tool rests 15 and 17 are set to have the same value. Then, the retracting operation of one of the tool rests 15 and 17 and the approaching operation of the other tool rest 17 and 15 are simultaneously started at the same rapid feed speed and fast feed time constant. For this reason, the retracting operation and the approaching operation of the tool rests 15 and 17 can be performed simultaneously without the tools 16 and 18 on the tool rests 15 and 17 interfering with each other. Therefore, unlike the conventional machine tool that requires the approach operation of the other tool post after the retracting operation of one tool post, the next machining can be started immediately and the machining time can be shortened. it can.

  (2) During execution of the control program, in accordance with the set value restoration command M600, the rapid feed speed and rapid feed time constant in the X-axis direction of the tool rests 15 and 17 set by the previous speed value unification command M500 are the default values. To be restored. Therefore, after the tools are switched by the retracting operation and approaching operation of the tool rests 15 and 17, the tool rests 15 and 17 can be independently fast-forwarded at a predetermined speed value that maximizes the capabilities of the machine. . Accordingly, the processing time can be further shortened.

  (3) As shown in FIGS. 4A and 4B, control programs for operating the first and second tool rests 15 and 17 independently are provided. When the tool is switched, the first and second tool rests 15 and 17 are rewritten so that the fast feed speed and the speed value formed by the fast feed time constant coincide with each other. In other words, only the velocity values of the first and second tool rests 15 and 17 are made to coincide with each other, and the movement amount, that is, the movement distance can be freely set. For this reason, unlike the case where the both tool rests 15 and 17 are operated synchronously, the first and second tool rests are selected according to the length and type of the tool 18 mounted on the first and second tool rests 15 and 17. 15 and 17 tool switching positions and machining start positions can be freely set.

  (4) The first and second tool rests 15 and 17 are independently operated by the respective control programs rewritten so that the rapid feed speed and the rapid feed time constant coincide with each other. Therefore, unlike the case where the other tool post 17 or 15 is moved synchronously while monitoring the operation of the one tool post 15 or 17, there is no need for a synchronous operation program for matching the operation timings of the start and end of synchronization. Thus, the program can be simplified. That is, the burden on the control system such as the CPU 22 is small and the operator does not need to create a program.

(Example of change)
In addition, this embodiment can also be changed and embodied as follows.
-In the said embodiment, although the 1st tool post 15 and the 2nd tool post 17 are each comprised by the turret tool post, both the tool posts 15 and 17 may be comprised by the comb-type tool post, respectively. One turret 15 and 17 may be constituted by a turret turret, and the other turret 17 and 15 may be constituted by a comb tooth turret.

  In the above embodiment, the NC program control has been described. However, the control is performed in the same manner even in the case of so-called electronic cam control in which the control axis position of the tool post with respect to time and the spindle position is commanded by table format data to drive the axis. be able to.

-Set only one of speed and acceleration including jerk as the speed value according to the speed value unification command M500.
-In the said embodiment, in the coincidence of the speed value of the 1st, 2nd tool rests 15 and 17 according to a speed value unification command, the speed value of the 1st, 2nd tool rests 15 and 17 is compared, and a smaller value is obtained. Match to a smaller value.

The principal part perspective view which shows the machine tool of one Embodiment. The principal part top view of the machine tool of FIG. The block diagram which shows the circuit structure of the machine tool. (A) And (b) is a figure which illustrates the control program of a 1st tool post and a 2nd tool post. (A) And (b) is a flowchart which shows the operation | movement which rewrites the speed value of the feed drive device for the 1st tool post and the 2nd tool post. (A) And (b) is a flowchart which shows the operation | movement which restore | restores the speed value of the feed drive device for the 1st tool post and the 2nd tool post. The principal part top view which shows the conventional machine tool.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Main stand, 12 ... Main spindle, 13 ... Workpiece, 15 ... 1st tool post, 16 ... 1st tool, 17 ... 2nd tool post, 18 ... 2nd tool, 21 ... Control apparatus, 22 ... Speed value setting means CPU constituting a speed value setting device, 23... ROM, 24. RAM constituting storage means, 27... Spindle rotation control circuit, 29... First tool feed control circuit, 31. ... Spindle rotation drive device, 34 ... First tool feed drive device constituting the first drive means, 36 ... Second tool feed drive device constituting the second drive means, Z1 ... Axis line, Z2 ... Axis line, Z3 ... Axis line, M500 ... Speed value unification command, M600 ... Setting value restoration command.

Claims (5)

A spindle supporting the workpiece,
A first tool post movably provided between a machining position and a retracted position along a direction orthogonal to the axis of the main spindle;
First driving means for driving the first tool post;
A second turret provided to be movable between a machining position and a retracted position along a direction orthogonal to the axis of the main spindle at a position facing the first turret across the axis of the main spindle;
Second driving means for driving the second tool post;
Speed value setting means for setting the speed values of the first tool post and the second tool post, respectively;
Control means for separately controlling the operation of the first and second driving means so that the first and second tool rests are moved according to the speed value set by the speed value setting means,
The speed value setting means sets the speed values of the first and second driving means to the same value according to a speed value unification command. The speed value setting means includes the first driving means and the approach operation of one of the first turret and the second turret and the retracting operation of the other turret in switching of the tool. The machine tool according to claim 1, wherein the speed values of the second drive means are set to the same value. The speed value setting means stores the speed values of the first driving means and the second driving means in a normal operation, and the speed values of the first driving means and the second driving means in a tool switching approach operation and a retracting operation. The machine tool according to claim 1, further comprising storage means for performing the operation. The machine tool according to any one of claims 1 to 3, wherein the speed value setting means sets a speed value for performing rapid tool switching. The speed value setting means releases the speed values of the first drive means and the second drive means from the same value setting state according to a set value restoration command. The machine tool according to the item.

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