JP6552533B2 - Workpiece machining method and machine tool using machine tool - Google Patents

Description

  The present invention relates to a method of processing a work using a machine tool and a machine tool.

In the prior art, there is known a processing method of cutting the surface of a workpiece using a machine tool. The tool attachment to the machine tool, in addition to the tool for machining while continuously rotated around the central axis of the tool as an end mill, there is a tool for processing in a state in which no continuous rotation as bytes. When a cutting tool is used as a tool, the surface of the workpiece can be cut by sliding the cutting edge of the tool on the surface of the workpiece.

  In Japanese Patent Application Laid-Open No. 6-259124, there is disclosed a method of processing a workpiece in which a character line is formed on a processing surface of a workpiece using a hail bite. This publication discloses a method of moving a tool along the A, B, and C axes of a machine tool to continuously form a character line while avoiding interference between a workpiece and the tool. .

  In Japanese Patent Application Laid-Open No. 60-155310, a processing method using a general-purpose Halebite is disclosed. In this processing method, it is disclosed that the movement path of the cutting edge center is controlled based on the X axis, the Y axis, and the Z axis. Further, a machining method is disclosed in which the total hail tool is rotated about an axis passing through the center of the cutting edge.

JP-A-6-259124 JP 60-155310 A

  Depending on the type of workpiece to be machined by the machine tool, the inner surface of the workpiece may be cut instead of the outer surface of the workpiece. When processing a workpiece with a machine tool, the outer surface of the workpiece can be easily processed. However, when machining the inner surface of the workpiece, it may be difficult to perform high-quality cutting with a machine tool.

For example, when a long and narrow groove is formed on the inner surface of a cylindrical workpiece, an end mill or the like can be used as a tool. An end mill is a rotating tool that rotates continuously about a central axis. When a groove is formed using an end mill, circular streaks appear on the processed surface. Fine irregularities are formed on the surface of the groove in various directions. For example, the sealing member may be disposed inside the groove to form a seal. When the surface of the groove is used as a sealing surface, gas tends to leak in the width direction of the groove.

  For this reason, it was necessary to polish after processing with an end mill. For example, the operator needs to perform polishing such as fluid polishing or electrolytic polishing. Or, the worker had to polish the surface of the groove by hand polishing. Furthermore, when fluid polishing, electrolytic polishing, hand polishing or the like is performed, there have been cases in which corner portions become rounded or dimensional accuracy deteriorates.

  An object of this invention is to provide the processing method and machine tool which can process the inner surface of a cylindrical workpiece or the inner surface of the hole of a workpiece | work accurately.

The first machining method of the present invention is a machining method for cutting the inner surface of a cylindrical workpiece or the inner surface of a hole portion of a workpiece with a machine tool including two linear feed shafts and one rotary feed shaft. Two linear feed axis is the Y-axis extending in a direction perpendicular to the Z axis and the main axis of the axis extending in a direction parallel to the axis of the spindle. One rotational feed axis is a C axis around an axis parallel to the direction in which the main axis extends. The tool for cutting the workpiece is a cutting tool. A connecting device for connecting the spindle and the tool is arranged on the machine tool. The connecting device is connected to the main shaft, and the input shaft rotates about an axis parallel to the Z axis, and the output shaft to which the tool is connected and rotates along the tool rotational feed axis about the axis perpendicular to the Z axis. And a mechanism for transmitting the rotational force of the input shaft to the output shaft. The tool is connected to the output shaft so that the tool extends along the axis of the tool rotational feed axis, and rotation of the output shaft changes the direction of the tool on the circumference around the axis of the tool rotational feed axis. The processing method includes the steps of disposing a tool inside the work, moving the work or tool along the Y axis to press the tool against the work, rotating the work or tool along the C axis, and Or moving the tool along the Z-axis to cut the inner surface of the workpiece or the inner surface of the hole. The cutting process cuts the workpiece and changes the direction of the tool along the tool rotational feed axis to set the tool in a preset direction with respect to the extending direction of the tool path along the inner surface of the workpiece or the inner surface of the hole. Adjusting the direction of The adjusting step controls the rotation angle of the tool on the tool rotation feed shaft by controlling the rotation angle of the main shaft.

The second machining method of the present invention is a machining method in which an inner surface of a cylindrical workpiece or an inner surface of a hole portion of a workpiece is cut with a machine tool including two linear feed shafts and one rotary feed shaft. Two linear feed axis is the Y-axis extending in a direction perpendicular to the Z axis and the main axis of the axis extending in a direction parallel to the axis of the spindle. One rotational feed axis is a C axis around an axis parallel to the direction in which the main axis extends. The tool for cutting the workpiece is a cutting tool. A connecting device for connecting the spindle and the tool is arranged on the machine tool. The connecting device is connected to the main shaft, and the input shaft rotates about an axis parallel to the Z axis, and the output shaft to which the tool is connected and rotates along the tool rotational feed axis about the axis perpendicular to the Z axis. And a mechanism for transmitting the rotational force of the input shaft to the output shaft. The tool is connected to the output shaft so that the tool extends along the axis of the tool rotational feed axis, and rotation of the output shaft changes the direction of the tool on the circumference around the axis of the tool rotational feed axis. The processing method includes the steps of disposing a tool inside the work, moving the work or tool along the Y axis to press the tool against the work, rotating the work or tool along the C axis, and Or moving the tool along the Z-axis to cut the inner surface of the workpiece or the inner surface of the hole. A first tool path along the inner surface of the work or the inner surface of the hole, and a second tool path extending in a direction different from the extending direction of the first tool path along the inner surface of the work or the inner surface of the hole in advance It has been established. The cutting process is performed while maintaining the rotation angle of the tool at the tool rotation feed axis at the first rotation angle so that the preset tool direction is in the direction in which the first tool path extends . After the cutting in step 1 and the first step is completed, the rotational angle of the tool at the tool rotational feed axis is set to a predetermined tool orientation with respect to the extending direction of the second tool path . And a second step of cutting while maintaining the rotational angle of 2. The rotation angle of the tool is controlled by controlling the rotation angle of the spindle.

  In the said invention, a cutting process can include the process of implementing a 1st process and a 2nd process with respect to one workpiece | work.

  In the above invention, the cutting step can include the step of performing the first step on one work and the step of removing the one work from the machine tool. The cutting step can include a step of attaching another workpiece to the machine tool and a step of performing the second step on the other workpiece.

A first machine tool of the present invention includes a spindle head including a spindle. The machine tool includes a moving device that changes the relative position of the workpiece with respect to the tool at a feed shaft including two linear feed shafts and one rotational feed shaft, and a control device that controls the moving device. Two linear feed axis is the Y-axis extending in a direction perpendicular to the Z axis and the main axis of the axis extending in a direction parallel to the axis of the spindle. One rotational feed axis is a C axis around an axis parallel to the direction in which the main axis extends. The tool is a cutting tool for cutting a workpiece. The moving device includes a main shaft motor that rotates the main shaft and a connecting device that connects the main shaft and the tool . The connecting device is connected to the main shaft, and the input shaft rotates about an axis parallel to the Z axis, and the output shaft to which the tool is connected and rotates along the tool rotational feed axis about the axis perpendicular to the Z axis. And a mechanism for transmitting the rotational force of the input shaft to the output shaft. The tool is connected to the output shaft such that the tool extends along the axis of the tool rotational feed axis, and rotation of the output shaft changes the circumferential direction about the axis of the tool rotational feed axis. The control device is based on a processing program for cutting the inner surface of the cylindrical workpiece or the inner surface of the hole of the workpiece, in a direction set in advance with respect to the extending direction of the tool path along the inner surface of the workpiece or the inner surface of the hole. A control for adjusting the direction of the tool, a control for moving the work or tool along the Y axis to press the tool against the work, and a rotation of the work or tool along the C axis while the work or tool is on the Z axis By performing control to move along, the inner surface of the workpiece or the inner surface of the hole is cut.
The third processing method of the present invention is a processing method for cutting the inner surface of a cylindrical workpiece or the inner surface of a hole portion of a workpiece with a machine tool including two linear feed shafts and one rotary feed shaft. The two linear feed axes are a Z axis extending in a direction parallel to the axis of the main axis and a Y axis extending in a direction perpendicular to the axis of the main axis. One rotational feed axis is a C axis around an axis inclined with respect to the direction in which the main axis extends. The tool for cutting the workpiece is a cutting tool. A connecting device for connecting the spindle and the tool is arranged on the machine tool. The connecting device is connected to the main shaft, and an input shaft that rotates about an axis parallel to the Z axis, and a tool connected thereto, and an output that rotates along the tool rotational feed axis about an axis inclined to the Z axis It has a shaft and a mechanism for transmitting the rotational force of the input shaft to the output shaft. The tool is connected to the output shaft so that the tool extends along the axis of the tool rotational feed axis, and rotation of the output shaft changes the direction of the tool on the circumference around the axis of the tool rotational feed axis. The machining method includes a step of placing a tool inside the workpiece, a step of moving at least one of the workpiece and the tool along the Y-axis and the Z-axis to press the tool against the workpiece, and the workpiece or the tool on the C-axis. And a cutting step of moving at least one of the workpiece and the tool along the Z-axis and the Y-axis while rotating along, and cutting the inner surface of the workpiece or the inner surface of the hole. The cutting process cuts the workpiece and changes the direction of the tool along the tool rotational feed axis to set the tool in a preset direction with respect to the extending direction of the tool path along the inner surface of the workpiece or the inner surface of the hole. Adjusting the direction of The adjusting step controls the rotation angle of the tool on the tool rotation feed shaft by controlling the rotation angle of the main shaft.
The fourth machining method of the present invention is a machining method in which the inner surface of a cylindrical workpiece or the inner surface of a hole portion of a workpiece is cut with a machine tool including two linear feed shafts and one rotary feed shaft. The two linear feed axes are a Z axis extending in a direction parallel to the axis of the main axis and a Y axis extending in a direction perpendicular to the axis of the main axis. One rotational feed axis is a C axis around an axis inclined with respect to the direction in which the main axis extends. The tool for cutting the workpiece is a cutting tool. A connecting device for connecting the spindle and the tool is arranged on the machine tool. The connecting device is connected to the main shaft, and an input shaft that rotates about an axis parallel to the Z axis, and a tool connected thereto, and an output that rotates along the tool rotational feed axis about an axis inclined to the Z axis It has a shaft and a mechanism for transmitting the rotational force of the input shaft to the output shaft. The tool is connected to the output shaft so that the tool extends along the axis of the tool rotational feed axis, and rotation of the output shaft changes the direction of the tool on the circumference around the axis of the tool rotational feed axis. The machining method includes a step of placing a tool inside the workpiece, a step of moving at least one of the workpiece and the tool along the Y-axis and the Z-axis to press the tool against the workpiece, and the workpiece or the tool on the C-axis. And a cutting step of moving at least one of the workpiece and the tool along the Z-axis and the Y-axis while rotating along, and cutting the inner surface of the workpiece or the inner surface of the hole. A first tool path along the inner surface of the work or the inner surface of the hole, and a second tool path extending in a direction different from the extending direction of the first tool path along the inner surface of the work or the inner surface of the hole in advance It has been established. The cutting process is performed while maintaining the rotation angle of the tool at the tool rotation feed axis at the first rotation angle so that the preset tool direction is in the direction in which the first tool path extends. After the cutting in step 1 and the first step is completed, the rotational angle of the tool at the tool rotational feed axis is set to a predetermined tool orientation with respect to the extending direction of the second tool path. And a second step of cutting while maintaining the rotational angle of 2. The rotation angle of the tool is controlled by controlling the rotation angle of the spindle.
A second machine tool of the present invention comprises a spindle head including a spindle. The machine tool includes a moving device that changes the relative position of the workpiece with respect to the tool at a feed shaft including two linear feed shafts and one rotational feed shaft, and a control device that controls the moving device. The two linear feed axes are a Z axis extending in a direction parallel to the axis of the main axis and a Y axis extending in a direction perpendicular to the axis of the main axis. One rotational feed axis is a C axis around an axis inclined with respect to the direction in which the main axis extends. The tool is a cutting tool for cutting a workpiece. The moving device includes a main shaft motor that rotates the main shaft and a connecting device that connects the main shaft and the tool. The connecting device is connected to the main shaft, and an input shaft that rotates about an axis parallel to the Z axis, and a tool connected thereto, and an output that rotates along the tool rotational feed axis about an axis inclined to the Z axis A shaft and a mechanism for transmitting the rotational force of the input shaft to the output shaft. The tool is connected to the output shaft so that the tool extends along the axis of the tool rotation feed shaft, and the output shaft rotates. The direction on the circumference around the axis of the tool rotation feed axis changes, and the control device cuts the inner surface of the workpiece or the hole based on the machining program that cuts the inner surface of the hole of the workpiece. Control to adjust the direction of the tool in a preset direction with respect to the extending direction of the tool path along the inner surface of the part, and moving at least one of the work and the tool along the Y axis and Z axis to move the tool And by controlling at least one of the workpiece and the tool along the Z-axis and the Y-axis while rotating the workpiece or the tool along the C-axis. Or cut the inner surface of the hole.

  ADVANTAGE OF THE INVENTION According to this invention, the processing method and machine tool which can process the inner surface of a cylindrical workpiece | work or the inner surface of the hole part of a workpiece | work accurately can be provided.

It is a front view of the 1st machine tool in an embodiment. It is a block diagram of the machine tool in an embodiment. It is a perspective view of the 1st work in an embodiment. It is sectional drawing of a 1st workpiece | work. It is an expanded view when expand | deploying the inner surface of a 1st workpiece | work. It is an enlarged perspective view of a hail tool and a work in an embodiment. It is a perspective view of the 2nd work in an embodiment. It is a front view of the 2nd machine tool in an embodiment. It is an expanded view when expand | deploying the inner surface of the 3rd workpiece | work in embodiment.

  With reference to FIG. 1 to FIG. 9, a machining method and a machine tool in the embodiment will be described. In the present embodiment, a numerically controlled machine tool will be described as an example.

  FIG. 1 is a schematic front view of a first machine tool in the present embodiment. The first machine tool 11 includes a bed 13 serving as a base and a column 15 erected on the upper surface of the bed 13. A carriage 27 is disposed in front of the column 15 on the upper surface of the bed 13. On the upper surface of the carriage 27, a rotary table 35 for rotating the workpiece 1 is disposed. The workpiece 1 is fixed to the rotary table 35 via a holding member.

A saddle 17 is disposed on the front of the column 15. Further, on the front surface of the saddle 17, a spindle head 21 including a spindle is disposed. A connecting device 41 is connected to the spindle head 21 for holding the tool in a direction different from the direction in which the spindle extends. The tool is a cutting tool that cuts off the surface of the workpiece 1. In the present embodiment, Hale bite 51 is used as a tool.

  The tool of the present embodiment is a heal bite having a straight tip of the blade, but the present invention is not limited to this configuration, and an arbitrary bit can be used. For example, a total cutting tool having a blade portion having a desired shape may be used. As a tool, a cutting tool such as a lathe cutting tool used in a lathe may be adopted. The hair bit contacts the work in a linear manner, while the lathe bit contacts the work in a dotted manner.

  The spindle head 21 is formed to be movable in the vertical direction. In the first machine tool 11, the Z axis is set in the direction in which the spindle head 21 moves relative to the saddle 17. The first machine tool 11 has an X axis and a Y axis. The X axis and the Y axis extend in the horizontal direction and are orthogonal to each other. The saddle 17 moves in the X-axis direction integrally with the spindle head 21. The carriage 27 moves in the Y-axis direction integrally with the rotary table 35.

  FIG. 2 shows a block diagram of the first machine tool in the present embodiment. Referring to FIGS. 1 and 2, the machine tool 11 includes a moving device 30 that changes the relative position of the work 1 with respect to the hail bite 51 connected to the connecting device 41. The moving device 30 moves the work 1 or the tool along the respective movement axes. The moving device 30 can relatively move the tool and the workpiece 1 in the X-axis direction, the Y-axis direction, and the Z-axis direction. Furthermore, the moving device 30 in the present embodiment includes a rotating table 35. When the rotary table 35 rotates the workpiece 1 along the C axis, the workpiece 1 can be rotated and moved relative to the hail tool 51. The moving device 30 of the first machine tool 11 includes axis servomotors 75.

  The moving device in the present embodiment includes a Y-axis moving device. The Y-axis moving device includes a pair of Y-axis rails 29 arranged on the upper surface of the bed 13. The carriage 27 is formed so as to be able to reciprocate along the Y-axis rail 29. The Y-axis moving device moves the carriage 27 by driving the Y-axis feed motor. The rotary table 35 and the work 1 move in the Y-axis direction together with the carriage 27.

  The moving device in the present embodiment includes an X-axis moving device. The X-axis moving device includes a pair of X-axis rails 19 formed on the front surface of the column 15. The saddle 17 is formed so as to be able to reciprocate along the X-axis rail 19. The X-axis moving device moves the saddle 17 by driving the X-axis feed motor. The spindle head 21 and the tool move in the X-axis direction together with the saddle 17.

  The moving device in the present embodiment includes a Z-axis moving device. The Z-axis moving device includes a pair of Z-axis rails 23 formed on the front surface of the saddle 17. The spindle head 21 is formed so as to be capable of reciprocating along the Z-axis rail 23. The Z-axis moving device moves the spindle head 21 by driving a Z-axis feed motor. The tool moves in the Z-axis direction together with the spindle head 21.

  The moving device in the present embodiment includes a C-axis moving device. The C-axis moving device includes a rotary table 35. A drive motor is disposed inside the rotary table 35. The rotary table 35 is formed to rotate the work 1 along the C-axis when the drive motor is driven.

  The machine tool 11 includes a control device 70 that controls the moving device 30 of each feed axis. The control device 70 is configured by, for example, an arithmetic processing device including a central processing unit (CPU), a random access memory (RAM), a read only memory (ROM), and the like connected to one another via a bus.

  The control device 70 includes an input unit 71, a reading interpretation unit 72, an interpolation calculation unit 73, and a servo control unit 74. When machining with a numerically controlled machine tool, a machining program 76 is prepared in advance. The machining program 76 can be created by a CAM (Computer Aided Manufacturing) device or the like based on the target shape of the workpiece. The target shape of the workpiece can be created by, for example, a CAD (Computer Aided Design) apparatus.

  A machining program 76 is input to the input unit 71. The machining program 76 includes information on the relative movement of the tool with respect to the workpiece. Note that a machining program newly created or edited by an operator in the information control unit 81 of the control device 70 may be input to the input unit 71.

  The reading and interpreting unit 72 reads the processing program 76 from the input unit 71. The reading and interpreting unit 72 sends the movement command to the interpolation operation unit 73. The interpolation operation unit 73 calculates a position command value for each interpolation cycle. For example, the interpolation calculation unit 73 calculates a movement amount for each time interval set based on the movement command. The interpolation operation unit 73 sends the position command value to the servo control unit 74. The servo control unit 74 calculates the movement amount of each feed axis such as the X axis and the Y axis based on the position command value, and drives each axis servo motor 75.

  The control device 70 of the present embodiment includes an information control unit 81 that controls information related to workpiece processing. The control device 70 includes an operation unit 84 for an operator to input information related to processing, and a display unit 85 that displays information related to processing. The operation unit 84 has a keyboard and the like, and is formed so as to be able to input processing information by manual operation of the operator. The display unit 85 displays information regarding processing. The control device 70 includes a storage unit 83 that stores information related to machining. The storage unit 83 may be a storage device such as a memory card or a hard disk connected via a communication interface, in addition to the above-described ROM and RAM.

The moving device 30 of the present embodiment includes a main shaft motor 77 that rotates the main shaft around the central axis. The spindle motor 77 is disposed inside the spindle head 21. The spindle motor 77 of the present embodiment changes the tool orientation instead of continuously rotating the tool around the central axis of the tool. The servo control unit 74 controls the rotation angle of the spindle motor 77 that changes the direction by rotating the hail bite 51. The servo control unit 74 sends a current command value to the spindle motor 77 based on the rotation angle of the spindle motor 77 specified by the processing program 76.

  A rotation angle detector 78 for detecting the rotation angle of each axis servo motor 75 is attached to each axis servo motor 75. The arithmetic processing unit 82 can detect the position on each moving axis based on the output of the rotation angle detector 78. A rotation angle detector 79 for detecting the rotation angle of the spindle motor 77 is attached to the spindle motor 77. As will be described later, the direction of the tool can be detected based on the output of the rotation angle detector 79.

  The information control unit 81 includes an arithmetic processing unit 82 that performs calculation and processing of information related to processing. The arithmetic processing unit 82 can receive the output of the rotation angle detectors 78 and 79 and can send a command for correcting the operation of each axis servomotor 75 and the operation of the spindle motor 77 to the reading and interpreting unit 72.

  Referring to FIG. 1, the moving device of the present embodiment includes a coupling device 41. The input shaft of the connecting device 41 is connected to the main shaft inside the main shaft head 21. The hair bit 51 is connected to the output shaft of the connecting device 41. The turning force of the main spindle inside the spindle head 21 is transmitted to the hair bit 51 via the coupling device 41. The coupling device 41 is formed so as to change the direction in which the axis of the rotary feed shaft extends. The coupling device 41 is configured by, for example, an angle head.

  The coupling device 41 can change the direction of the axis of the rotary feed shaft by an arbitrary mechanism. For example, the connecting device 41 includes a plurality of bevel gears, and the direction of the axis line can be changed by the bevel gears. Alternatively, the connecting device 41 includes a universal joint, and the direction of the axis can be changed by the universal joint.

  The coupling device 41 includes a fixing portion 42 that is fixed to the casing of the spindle head 21. By fixing the fixing portion 42 to the spindle head 21, it is possible to avoid the casing of the coupling device 41 from rotating around the axis 93.

When the main shaft motor 77 is driven, the main shaft rotates along the rotation feed axis C _s around the axis 93. The rotary feed axis C _s around the central axis of this spindle is also referred to as the spindle axis. The rotation of the spindle is transmitted to the hail bite 51 via the coupling device 41. The hair bite 51 changes its direction by rotating along the rotational feed axis C _s1 about the axis 94. In the present embodiment, the rotational feed shaft C _s1 for rotating the hale bit 51 is referred to as a tool rotational feed shaft. The Hale bite 51 of the present embodiment is fixed to the output shaft of the connecting device 41 so that the axis 94 passes through the tool tip point of the Hale bite 51. Thus, the coupling device 41, the orientation of the axis 93 of the C _s shaft as the rotational feed axis, is converted into the direction of the axis 94 of the rotary feed shaft C _s1.

The axis 93 is parallel to the axis 92 of the C axis of the machine tool 11. That is, the axis 93 is parallel to the axis of one rotational feed axis of the machine tool 11. In the first machine tool 11, the axis 94 extends in a direction perpendicular to the axis 92 of the C axis. Furthermore, the axis 94 extends in a direction perpendicular to the axis 93 of the C _s axis. The hair bit 51 is held to extend along the axis 94. Further, the connecting device 41 holds the hail bite 51 in a direction perpendicular to the direction in which the main axis extends.

The rotation angle of the rotation feed axis C _s of the main shaft corresponds to the rotation angle of the rotation feed axis C _s1 of the hail tool 51. In the machine tool 11, when the spindle motor 77 is driven, the orientation of the hail bite 51 changes. The control device 70 can adjust the direction of the hail tool 51 (the rotation angle of the tool rotation feed shaft) by setting the rotation angle of the main shaft.

Further, referring to FIG. 2, a rotation angle detector 79 for detecting the rotation angle of the spindle motor 77 is attached to the spindle motor 77. By detecting the rotational angle of the main shaft, it is possible to detect the rotational angle of the hale bit 51 with respect to the rotational feed axis C _s1 . The controller 70 can detect the phase of the main shaft based on the output of the rotation angle detector 79. The phase of the main axis corresponds to the phase of the _{Halebite at} the rotary feed axis _Cs1 . The control device 70 can perform control such as correcting the rotation angle of the tool rotation feed shaft.

  FIG. 3 shows a perspective view of a first work in the present embodiment. FIG. 4 shows a cross-sectional view of the first work in the present embodiment. Referring to FIGS. 1, 3 and 4, machine tool 11 changes the relative position of hale bite 51 to work 1 along the Z axis which is a linear feed axis and the C axis which is a rotary feed axis. Then, a cutting process for cutting the inner surface of the workpiece 1 is performed. The machine tool 11 cuts the inner surface 1 a of the cylindrical work 1 to form the groove 5 in the inner surface 1 a. The groove 5 is formed to extend along the circumferential direction of the inner surface 1a. The groove 5 of the present embodiment has a constant width along the extending direction. The groove 5 is formed such that the height from the bottom surface of the work 1 changes along the circumferential direction. The groove part 5 is formed so that the direction extended along the circumferential direction may change.

  FIG. 5 shows a developed view when the inner surface of the first work is developed. The groove 5 is formed along the tool path 91 along which the hale bite 51 travels. The tool path 91 corresponds to the path along which the tool tip point of the tool passes. The tool path 91 is along the inner surface 1 a of the workpiece 1. The tool path 91 is set in the machining program 76 by the coordinate values of each axis, for example. In the developed view, the tool path 91 along the inner surface 1a of the work 1 is formed not by a straight line but by a curve.

  FIG. 6 shows an enlarged perspective view of the hail tool and the groove portion of the workpiece in the present embodiment. The hail tool 51 includes a shank part 52 held by the connecting device 41 and a blade part 54 for cutting the workpiece 1. The hair bit is not limited to this form, and for example, the shank portion may include an elastic portion having a U-shape when viewed from the side.

  The tip 54 a of the blade 54 in contact with the work 1 extends linearly. In the hale bite 51 of the present embodiment, the tool tip point 54b is set at the center of the tip portion 54a. The tool tip point 54 b moves along the tool path 91 as indicated by the arrow 99.

  When the hair bit 51 travels along the tool path 91, the orientation of the hair bit 51 relative to the direction in which the tool path 91 extends is predetermined. In the example shown in FIG. 6, the angle in the extending direction of the tip 54 a of the blade 54 with respect to the extending direction of the tool path 91 corresponds to the direction of the hair bit 51. Here, the orientation of the hail tool 51 is controlled so that the tip 54a extends in a direction of 90 ° with respect to the direction in which the tool path 91 extends. The orientation of the hair bit corresponds to the angle of rotation about the axis 94 of the tool rotation feed axis. In the machining program 76, the rotation angle of the tool rotation feed axis is set.

  In addition, the direction of the hail tool with respect to the tool path is not limited to this form, and an arbitrary direction can be adopted. For example, in addition to processing the bottom of the groove as shown in FIG. 6, the side of the groove can be processed. A hail bite having a tip formed so as to extend parallel to the direction of the axis 94 can be used so that a desired side surface can be processed. Also in this case, the orientation of the hale bit with respect to the tool path can be set. As another example, when processing the bottom of the groove, the direction of the tool may be set such that the extending direction of the tip of the hair bit is inclined with respect to the extending direction of the tool path. Alternatively, this relative angle may be changed during the period of processing. For example, using the function of numerical control of the control device, the angle may be changed continuously in synchronization with the operation of the linear feed shaft and the rotary feed shaft.

  Referring to FIG. 5, in the present embodiment, since tool path 91 has a curved shape in the developed view, the orientation of hale bite 51 with respect to tool path 91 during the cutting process of cutting work 1 Need to change. For example, at a point 91 a on the tool path 91, the direction indicated by the arrow 97 is the extending direction of the tool path 91. On the other hand, at the point 91b on the tool path 91, the direction indicated by the arrow 98 is the direction in which the tool path 91 extends. The direction indicated by the arrow 97 and the direction indicated by the arrow 98 are not parallel to each other but are different from each other.

  In the present embodiment, cutting is continuously performed with the hail tool 51 so as to go from one end of the groove toward the lower end. During cutting, control is performed such that the extending direction of the tip of the hale bit 51 is perpendicular to the extending direction of the tool path 91. For this reason, the direction of the hail bite 51 is adjusted to the direction set with respect to the tool path during the cutting process.

Referring to FIG. 2, control device 70 changes the position of each moving axis based on machining program 76. In the present embodiment, a machining program 76 for cutting the inner surface of the cylindrical workpiece 1 can be created in advance. The processing program 76 includes, for example, information on the rotation angle of the C axis in addition to information on the positions of the X axis, the Y axis, and the Z axis. Further, the machining program 76 includes information on the rotation angle with respect to the C _s1 axis, which is the tool rotation feed axis of the hale bit 51. For example, the machining program includes information on the rotation angle of the spindle.

  The control device 70 drives each axis servo motor 75 to perform the step of disposing the hail tool 51 inside the workpiece 1. Referring to FIG. 1, control device 70 places saddle 17 at a predetermined position on the X axis. The control device 70 moves the work 1 to a position where the hail tool 51 can be inserted into the work 1 by moving the carriage 27.

  Next, the control device 70 moves the spindle head 21 in the Z-axis direction and arranges the hail tool 51 at a predetermined position. The hair bit 51 and a part of the connecting device 41 are disposed inside the work 1. The rotary table 35 rotates the workpiece 1 in the direction of the C axis and arranges the workpiece 1 at a position corresponding to the cutting start position.

Next, the control device 70 moves the carriage 27 in the Y-axis direction to start cutting so that the hale bite 51 is pressed against the inner surface 1 a of the work 1. The control device 70 moves the spindle head 21 in the Z-axis direction while rotating the workpiece 1 in the C-axis direction. Further, the control device 70 adjusts the rotation angle of the C _s1 axis of the bale bite 51 by controlling the rotation angle of the Cs axis of the spindle motor 77. That is, the control device 70 adjusts the direction of the hail bite 51. The direction of the hair bit 51 is controlled to extend in the direction of a predetermined angle with respect to the direction in which the tool path extends.

  The control device 70 of the present embodiment changes the moving speed of at least one of the moving speed on the rotary feed axis and the moving speed on the linear feed axis while cutting the work 1. And the control apparatus 70 is controlling the rotation angle of the tool rotation feed shaft regarding the hail tool 51 according to the change of a moving speed.

  When the groove is formed using a rotary tool such as an end mill, streaks are formed in various directions on the surface of the groove. That is, asperities extending in various directions are formed on the surface of the groove. For this reason, when a sealing member such as an O-ring is disposed in the groove, a fluid such as air may leak in the width direction perpendicular to the extending direction of the groove. On the other hand, in the processing method of the present embodiment, streaks that are substantially parallel to the direction in which the groove 5 extends are formed on the surface of the groove 5. For this reason, it is possible to suppress leakage of air or the like in the width direction perpendicular to the direction in which the groove portion 5 extends.

  Moreover, the groove part formed in a workpiece | work may be used as a guide groove where a predetermined part slides. For example, a convex portion formed on a predetermined part may move along the groove portion. Also in this case, when the groove portion is formed by the cutting tool, since the streaks formed on the surface of the groove portion extend along the groove portion, a predetermined part can be smoothly moved.

  As described above, the cutting process performed by the machine tool of the present embodiment changes the relative position of the tool to the workpiece and adjusts the tool orientation to the direction set with respect to the tool path along the inner surface of the workpiece. . By adopting this method, the inner surface of the cylindrical workpiece can be processed with high accuracy.

  In the machining method of the present embodiment, a connecting device 41 that transmits the rotation of the main shaft to the hail tool 51 is arranged in the machine tool 11. The coupling device 41 holds the hail tool 51 so as to extend in a direction different from the direction in which the main shaft of the machine tool 11 extends. Further, based on the rotation angle of the spindle, the rotation angle of the hale bit 51 at the tool rotation feed axis is controlled. By adopting this method, it is possible to control the rotation angle of the hail bite 51 by the spindle motor 77 that rotates the spindle disposed in the machine tool in the prior art. The machine tool is not limited to this form, and any configuration that changes the rotation angle of the hail tool on the tool rotation feed shaft can be adopted. For example, the coupling device may include a motor that changes the direction of the hail tool.

  The first work of the above embodiment is formed in a cylindrical shape, but is not limited to this form, and the present invention can be applied to a cylindrical work having any cross-sectional shape. For example, the present invention can be applied when machining the inner surface of a cylindrical workpiece having a polygonal cross-sectional shape.

  In the above-described processing method and machine tool, an example in which the inner surface of the cylindrical member is cut is taken, but the present invention is not limited to this form, and the present invention is applied to the case where the inner surface of a hole formed in a work is cut. can do.

  FIG. 7 shows an enlarged perspective view of the second work in the present embodiment. The workpiece 2 is formed in a rectangular parallelepiped shape, for example. A hole 6 is formed in a predetermined portion of the work 2. The hole 6 may have a bottom surface or may penetrate the workpiece 2. In this example, the groove 5 is formed on the inner surface 6 a of the hole 6 penetrating the work 2. The tool path is formed along the inner surface 6 a of the hole 6.

  The groove portion 5 is formed such that the height from the bottom surface of the workpiece 2 varies depending on the circumferential direction. That is, the groove part 5 is formed so that the rate of change in height from the bottom surface does not become constant along the circumferential direction. For this reason, also when forming the groove part 5 in the workpiece 2, the machine tool 11 needs to change the orientation of the hail bite 51 during the cutting process. Even when cutting the inner surface 6a of the hole 6 formed in the work 2 in this manner, the direction of the hair bit 51 is adjusted in the direction set with respect to the tool path along the inner surface 6a of the hole 6 of the work 2 can do. As a result, the machine tool 11 can process the inner surface of the hole 6 with high accuracy.

In the above embodiment, the machine tool 11 is based on two linear feed axes, the Z axis and the Y axis, one rotary feed axis, the C axis, and the tool rotational feed axis, the C _s1 axis. Although the cutting process is performed, the present invention is not limited to this mode, and the machine tool may further have another feed shaft.

  FIG. 8 shows a front view of a second machine tool in the present embodiment. The second machine tool 12 includes a swing member 31 that supports the rotary table 35 and a support member 32 that supports the swing member 31. The support member 32 is fixed to the carriage 27. The support member 32 has a pair of posts spaced in the X-axis direction. The support member 32 is formed in a U shape. Both ends of the rocking member 31 in the X-axis direction are supported by the support of the support member 32.

The machine tool 12 has an A axis as another rotary feed axis for changing the orientation of the workpiece 1 relative to the tool, in addition to the C axis as one rotary feed axis and the C _s1 axis as a tool rotary feed axis. The swing member 31 is supported so as to be swingable around the axis 95 of the A axis.

  The moving device includes an A-axis moving device. The A-axis moving device includes a servo motor that drives the swing member 31 around the A-axis. The control device 70 can control the rotation angle around the axis 95 of the swing member 31 by controlling the servo motor. That is, the control device 70 can control the inclination of the swinging member 31.

  The coupling device 41 holds the hail tool 51 in a direction inclined with respect to the direction in which the main shaft extends. Alternatively, the coupling device 41 holds the hail bite 51 so as to extend along the axis 94 inclined with respect to the axis 92 of the C axis.

  In the second machine tool 12, the workpiece 1 can be tilted by the swing member 31 swinging in the direction of the A axis. That is, in the cutting process of processing the workpiece 1, the workpiece 1 can be inclined. For this purpose, the connecting device 41 can be inserted from the direction inclined with respect to the extending direction of the inner surface 1 a of the work 1.

  The operator can create a machining program for cutting the inner surface 1a of the workpiece 1 in advance. The rotation angle of the A axis during the cutting process is set in the machining program. The angle at which the workpiece 1 is tilted by the swing member 31 corresponds to the angle at which the axis 94 is tilted. The control device 70 sets the rotation angle of the swing member 31 in the A-axis direction corresponding to the direction in which the hail tool 51 extends. In the present embodiment, the rotation angle of the A axis of the rocking member 31 is set such that the axis 94 in the direction in which the hail bite 51 extends is perpendicular to the axis 92 of the C axis.

  In the second machine tool 12, the cutting process of cutting the workpiece 1 includes the step of adjusting the orientation of the workpiece 1 along the A axis so as to correspond to the extending direction of the hail bite 51. Also in the second machine tool 12, when forming the groove portion 5 on the inner surface of the workpiece 1, the direction of the hail bite 51 can be adjusted according to the extending direction of the tool path.

  In the second machine tool 12, the connecting device 41 and the hale bit 51 can be inserted from the direction inclined in the extending direction of the inner surface of the cylindrical work 1. For this reason, the length of the connecting device 41 protruding from the spindle head 21 can be shortened. That is, the protruding amount of the coupling device 41 can be shortened. For example, the length in the direction of the axis 93 of the main shaft of the coupling device 41 can be shortened. As a result, the rigidity of the coupling device and the tool can be increased. Or damage of a connecting device and a tool can be controlled.

  In the above-described embodiment, an example in which the extending direction of the groove portion is changed in one groove portion is not limited to this embodiment. In one groove, the extending direction of the groove may be constant. There is a case where it is not necessary to adjust the rotation angle of the cutting tool in the tool rotation feed shaft during the period in which one groove is formed. Also in this case, when forming a plurality of grooves, the machine tool of the present embodiment can be used.

  FIG. 9 shows a developed view when the inner surface of the third workpiece in the present embodiment is developed. The third workpiece has a cylindrical shape as the first workpiece. A plurality of grooves 5a, 5b are formed on the inner surface 1a of the work. Each groove 5a, 5b has a constant extending direction in the developed view. That is, in the developed view, the tool path 96a for forming the groove 5a and the tool path 96b for forming the groove 5b are linear. In this case, the direction of the tool with respect to the tool path is maintained constant during the period of cutting one groove.

  On the other hand, the extending directions of the plurality of groove portions 5a and 5b are different from each other. In the developed view, the tool path 96a and the tool path 96b are not parallel but extend in different directions. When forming the groove portion 5a, the control device maintains the first rotation angle of the tool rotation angle on the tool rotation feed shaft. In this state, the controller 5 changes the relative position of the tool with respect to the workpiece, thereby forming the groove 5a. When the groove 5b is formed, the control device maintains the rotation angle of the cutting tool at a second rotation angle different from the first rotation angle at the tool rotation feed shaft. In this state, the controller 5 changes the relative position of the tool with respect to the workpiece, thereby forming the groove 5b.

  Thus, the cutting step can include a first step of performing cutting while maintaining the first rotation angle at the tool rotation feed shaft. In the first step, for example, the groove 5a is formed. In addition, the cutting step can include a second step of cutting while maintaining the second rotation angle different from the first rotation angle in the tool rotation feed shaft. In the second step, the groove 5b is formed. That is, the control device can change the rotation angle of the tool on the tool rotation feed shaft every time one groove is formed.

  By this control, a plurality of types of machining can be performed with high accuracy for one workpiece. In addition, it is not necessary to use a plurality of types of cutting tools corresponding to the extending direction of the groove sections, and processing of many types of groove sections can be performed using one cutting tool.

  Furthermore, in one machine tool of the present embodiment, different types of processing can be performed on a plurality of works. For example, after the groove 5a shown in FIG. 9 is formed on one work, the groove 5b shown in FIG. 9 can be formed on another work. In this case, the cutting step includes a step of forming the groove 5a by performing the first step on one workpiece. The cutting process includes a process of removing one workpiece after machining from the machine tool, and a process of attaching another workpiece before machining to the same machine tool. The cutting step includes the step of forming the groove 5b by performing the second step on another workpiece.

  By this control, a plurality of types of processing can be accurately performed on a plurality of workpieces. Further, it is possible to process a plurality of types of work in which the extending directions of the groove portions are different from each other by one machine tool. It is not necessary to use a plurality of types of cutting tools corresponding to the extending direction of the grooves, and it is possible to process many types of grooves using one cutting tool.

  Although the above-mentioned processing method illustrated and explained the method of forming a slot in a work, it is not restricted to this form. The present invention can be applied to any processing for cutting the inner surface of a cylindrical workpiece or the inner surface of a hole portion of the workpiece. For example, the present invention can be applied to processing for forming a step on the inner surface of a cylindrical workpiece or the inner surface of a hole portion of the workpiece.

  The above embodiments can be combined as appropriate. In the respective drawings described above, the same or equivalent parts are denoted by the same reference numerals. The above embodiment is an exemplification and does not limit the invention. Further, in the embodiment, changes of the embodiment shown in the claims are included.

1, 2 Workpiece 1a inner surface 5, 5a, 5b groove 6 hole 6a inner surface 11, 12 machine tool 30 moving device 31 rocking member 35 rotary table 41 connecting device 51 hair bit 70 control device 75 servo motor 76 for each axis 76 machining program 77 Spindle motor 91, 96a, 96b Tool path 92, 93, 94, 95 axis

Claims (8)

A machining method for cutting the inner surface of a cylindrical workpiece or the inner surface of a hole in a workpiece with a machine tool including two linear feed shafts and one rotary feed shaft,
The two linear feed axis is Y-axis extending in a direction perpendicular to the Z axis and the main axis of the axis extending in a direction parallel to the axis of the spindle,
The one rotary feed shaft is a C-axis around an axis parallel to the direction in which the main shaft extends,
The tool to cut the work is a cutting tool,
Arrange the connecting device which connects the spindle and the tool to the machine tool,
The connecting device is connected to a main shaft, and an input shaft rotating about an axis parallel to the Z-axis, and a tool connected, rotates along a tool rotational feed axis about an axis perpendicular to the Z-axis An output shaft, and a mechanism for transmitting the rotational force of the input shaft to the output shaft,
A tool is connected to the output shaft so that the tool extends along the axis of the tool rotational feed axis, and rotation of the output shaft changes the direction of the tool on the circumference around the axis of the tool rotational feed axis And
Placing a tool inside the workpiece;
Moving a workpiece or a tool along the Y axis to press the tool onto the workpiece;
Cutting the inner surface of the workpiece or the inner surface of the hole by moving the workpiece or tool along the Z-axis while rotating the workpiece or tool along the C-axis ,
The cutting process is performed by cutting the work and changing the direction of the tool along the tool rotational feed axis to set in advance the direction in which the tool path extends along the inner surface of the work or the inner surface of the hole. Including the step of adjusting the tool orientation,
The adjusting step includes controlling the rotation angle of the tool on the tool rotation feed shaft by controlling the rotation angle of the main shaft. A machining method for cutting the inner surface of a cylindrical workpiece or the inner surface of a hole in a workpiece with a machine tool including two linear feed shafts and one rotary feed shaft,
The two linear feed axis is Y-axis extending in a direction perpendicular to the Z axis and the main axis of the axis extending in a direction parallel to the axis of the spindle,
The one rotary feed shaft is a C-axis around an axis parallel to the direction in which the main shaft extends,
The tool to cut the work is a cutting tool,
Arrange the connecting device which connects the spindle and the tool to the machine tool,
The connecting device is connected to a main shaft, and an input shaft rotating about an axis parallel to the Z-axis, and a tool connected, rotates along a tool rotational feed axis about an axis perpendicular to the Z-axis An output shaft, and a mechanism for transmitting the rotational force of the input shaft to the output shaft,
A tool is connected to the output shaft so that the tool extends along the axis of the tool rotational feed axis, and rotation of the output shaft changes the direction of the tool on the circumference around the axis of the tool rotational feed axis And
Placing a tool inside the workpiece;
Moving a workpiece or a tool along the Y axis to press the tool onto the workpiece;
Cutting the inner surface of the workpiece or the inner surface of the hole by moving the workpiece or tool along the Z-axis while rotating the workpiece or tool along the C-axis ,
A first tool path along the inner surface of the work or the inner surface of the hole, and a second tool path extending along the inner surface of the work or the inner surface of the hole in a direction different from the extending direction of the first tool path Is predetermined,
Cutting the cutting step, said to be the direction of the preset tool to the first direction of extension of the tool path, while maintaining a rotation angle of the tool definitive to the tool rotary feed shaft to the first rotation angle After the cutting of the first step is completed, the tool rotational feed shaft is set to have a preset tool direction with respect to the extending direction of the second tool path. And a second step of cutting while maintaining the rotation angle of the tool at the second rotation angle, and controlling the rotation angle of the tool at the tool rotation feed axis by controlling the rotation angle of the spindle A processing method that is characterized. The said cutting process is a processing method of Claim 2 including the process of implementing the said 1st process and the said 2nd process with respect to one workpiece | work. The cutting step includes a step of performing the first step on one workpiece, a step of removing the one workpiece from a machine tool, a step of attaching another workpiece to the machine tool, and the other workpiece. the first including second and a step of step implementing the processing method according to claim 2 against. A spindle head including a spindle,
A moving device that changes the relative position of the workpiece relative to the tool at a feed axis including two linear feed axes and one rotational feed axis;
And a controller for controlling the mobile device;
The two linear feed axis is Y-axis extending in a direction perpendicular to the Z axis and the main axis of the axis extending in a direction parallel to the axis of the spindle,
The one rotary feed shaft is a C-axis around an axis parallel to the direction in which the main shaft extends,
The tool is a cutting tool that cuts the work,
The moving device includes a main shaft motor that rotates the main shaft, and a connecting device that connects the main shaft and the tool ,
The connecting device is connected to a main shaft, and an input shaft rotating about an axis parallel to the Z-axis, and a tool connected, rotates along a tool rotational feed axis about an axis perpendicular to the Z-axis An output shaft, and a mechanism for transmitting the rotational force of the input shaft to the output shaft,
The tool is connected to the output shaft such that the tool extends along the axis of the tool rotational feed axis, and rotation of the output shaft changes the circumferential direction around the axis of the tool rotational feed axis. ,
The control device is based on a processing program for cutting the inner surface of the cylindrical workpiece or the inner surface of the hole of the workpiece, in a direction set in advance with respect to the extending direction of the tool path along the inner surface of the workpiece or the inner surface of the hole. wherein a control for adjusting the orientation of the tool, and control for pressing the tool into the workpiece moves along the workpiece or tool in the Y-axis, while rotating along the workpiece or tool to the C-axis, the workpiece or the tool A machine tool characterized by cutting an inner surface of a workpiece or an inner surface of a hole by performing control to move along the Z axis . A machining method for cutting the inner surface of a cylindrical workpiece or the inner surface of a hole in a workpiece with a machine tool including two linear feed shafts and one rotary feed shaft,
The two linear feed axes are a Z-axis extending in a direction parallel to the axis of the main axis and a Y-axis extending in a direction perpendicular to the axis of the main axis,
The one rotational feed axis is a C axis around an axis inclined with respect to the direction in which the main axis extends,
The tool that cuts the workpiece is a bite,
Arrange the connecting device which connects the spindle and the tool to the machine tool,
The coupling device is coupled to the main shaft, and an input shaft that rotates about an axis parallel to the Z axis, and a tool is coupled, along a tool rotational feed axis about an axis that is inclined with respect to the Z axis A rotating output shaft and a mechanism for transmitting the rotational force of the input shaft to the output shaft,
A tool is connected to the output shaft so that the tool extends along the axis of the tool rotational feed axis, and rotation of the output shaft changes the direction of the tool on the circumference around the axis of the tool rotational feed axis And
Placing the tool inside the workpiece;
Moving at least one of the workpiece and the tool along the Y-axis and the Z-axis to press the tool against the workpiece;
A cutting step of moving at least one of the work and the tool along the Z axis and the Y axis while cutting the work or the tool along the C axis to cut the inner surface of the work or the inner surface of the hole; Including
The cutting process is performed by cutting the work and changing the direction of the tool along the tool rotational feed axis to set in advance the direction in which the tool path extends along the inner surface of the work or the inner surface of the hole. Including the step of adjusting the orientation of the tool,
The processing step is characterized in that the rotation angle of the tool at the tool rotation feed axis is controlled by controlling the rotation angle of the spindle. A machining method for cutting the inner surface of a cylindrical workpiece or the inner surface of a hole in a workpiece with a machine tool including two linear feed shafts and one rotary feed shaft,
The two linear feed axes are a Z-axis extending in a direction parallel to the axis of the main axis and a Y-axis extending in a direction perpendicular to the axis of the main axis,
The one rotational feed axis is a C axis around an axis inclined with respect to the direction in which the main axis extends,
The tool that cuts the workpiece is a bite,
Arrange the connecting device which connects the spindle and the tool to the machine tool,
The coupling device is coupled to the main shaft, and an input shaft that rotates about an axis parallel to the Z axis, and a tool is coupled, along a tool rotational feed axis about an axis that is inclined with respect to the Z axis A rotating output shaft and a mechanism for transmitting the rotational force of the input shaft to the output shaft,
A tool is connected to the output shaft so that the tool extends along the axis of the tool rotational feed axis, and rotation of the output shaft changes the direction of the tool on the circumference around the axis of the tool rotational feed axis And
Placing the tool inside the workpiece;
Moving at least one of the workpiece and the tool along the Y-axis and the Z-axis to press the tool against the workpiece;
A cutting step of moving at least one of the work and the tool along the Z axis and the Y axis while cutting the work or the tool along the C axis to cut the inner surface of the work or the inner surface of the hole; Including
A first tool path along the inner surface of the work or the inner surface of the hole, and a second tool path extending along the inner surface of the work or the inner surface of the hole in a direction different from the extending direction of the first tool path It is predetermined and
In the cutting process, cutting is performed while maintaining the rotational angle of the tool at the tool rotational feed axis at a first rotational angle so that the preset tool direction is in the direction in which the first tool path extends. A tool at the tool rotation feed shaft so as to have a preset tool direction with respect to the extending direction of the second tool path after the first process to be performed and the cutting of the first process are finished And a second step of cutting while maintaining the rotation angle of the tool at the second rotation angle, and controlling the rotation angle of the tool by controlling the rotation angle of the spindle to control the rotation angle of the tool at the tool rotation feed shaft. The processing method. A spindle head including a spindle,
A moving device that changes the relative position of the workpiece with respect to the tool on a feed axis including two linear feed axes and one rotary feed axis;
A control device for controlling the mobile device,
The two linear feed axes are a Z-axis extending in a direction parallel to the axis of the main axis and a Y-axis extending in a direction perpendicular to the axis of the main axis,
The one rotational feed axis is a C axis around an axis inclined with respect to the direction in which the main axis extends,
A tool is a cutting tool for cutting a workpiece.
The moving device includes a spindle motor that rotates a spindle, and a coupling device that couples the spindle and a tool.
The coupling device is coupled to the main shaft, and an input shaft that rotates about an axis parallel to the Z axis, and a tool is coupled, along a tool rotational feed axis about an axis that is inclined with respect to the Z axis A rotating output shaft and a mechanism for transmitting the rotational force of the input shaft to the output shaft,
The tool is connected to the output shaft such that the tool extends along the axis of the tool rotational feed axis, and rotation of the output shaft changes the circumferential direction around the axis of the tool rotational feed axis. ,
The control device is based on a processing program for cutting the inner surface of the cylindrical workpiece or the inner surface of the hole of the workpiece, in a direction set in advance with respect to the extending direction of the tool path along the inner surface of the workpiece or the inner surface of the hole. Control for adjusting the direction of the tool, Control for moving at least one of the work and the tool along the Y axis and the Z axis to press the tool against the work, and rotating the work or tool along the C axis A machine tool characterized by cutting an inner surface of a work or an inner surface of a hole by performing control of moving at least one of a work and a tool along the Z axis and the Y axis while .

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