JP2006272468A - Inner surface machining device for hollow work - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inner surface machining device capable cutting an inner plane and an inner spherical surface by rotating a work. <P>SOLUTION: This inner surface machining device for a hollow work includes: a spindle stock 11 rotatably supporting a spindle 21 for driving the hollow work W in rotation; a tail stock 12 disposed opposite to the spindle stock; machining units 40, 50 holding tool shanks 42, 52 to be movable in the radial direction; a pair of unit holding arbors 25, 31 provided on the spindle stock and the tail stock to move forward and backward, thereby unrotatably holding the machining units inserted in the hollow work from both sides; an axial direction moving means 48 for moving the machining units in the axial direction by the cooperation of the paired unit holding arbors; and a radial direction moving means 47 for moving the tool shanks in the radial direction through the interior of one unit holding arbor. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an inner surface processing apparatus for processing an inner surface of a hollow workpiece such as a differential case.

  For example, in an automobile differential case in which a differential gear mechanism is accommodated, the inner plane where the back surfaces of the pair of side gears are in sliding contact and the inner spherical surface where the back surfaces of the pair of pinion gears engaged with the side gears are processed with high precision are processed. Is required to do. In particular, in a hollow integrated differential case, the cutter mounted on the main shaft cannot be inserted from the outside of the differential case to process the inner flat surface and the inner spherical surface. As described above, the entire cutter is inserted into the differential case and is rotationally driven by the cutter driver to process the inner spherical surface.

That is, the processing apparatus described in Patent Document 1 carries a differential case between a pair of cutter drivers arranged opposite to each other by a support arm or the like of a conveying device, and a tool suspension mechanism inside the differential case. A cutter supported rotatably is inserted, and both ends of the cutter are clamped by the tip shafts of a pair of cutter drivers, and the cutter is rotated in the tool suspension mechanism via the cutter driver in this state. ing. Then, the inner spherical surface of the differential case is processed by the cutter by integrally moving the cutter together with the pair of cutter drivers in the axial direction.
JP-A-2005-34974 (paragraphs 0013, 0014, FIGS. 5 and 6)

  However, in the inner surface machining apparatus described in Patent Document 1 described above, the inner surface is machined by rotating the cutter while the hollow workpiece (difference case) is fixed. Necessary. For this reason, the inner surface machining accuracy depends on the shaping accuracy of the overall cutter, and in particular, the surface roughness does not change even if the machining conditions are changed due to the overall shape of the cutter. In some cases, it is necessary to add a finishing process such as a burnish after a cutting process using a general cutter. Further, since the cutter is usually shaped by a tool maker, it is difficult to manage the tool and the tool cost is high.

  Moreover, in the inner surface processing apparatus described in Patent Document 1 described above, in a workpiece having an inner spherical surface and an inner plane such as a differential case, in order to process the inner spherical surface and the inner plane with a single machine, the workpiece is used. There is a problem that it is necessary to turn 90 degrees and an index table is required.

  The present invention has been made to solve the above-described conventional problems, and an object thereof is to provide an inner surface machining apparatus capable of turning an inner plane and an inner spherical surface while rotating a workpiece.

  In order to solve the above-mentioned problem, the invention according to claim 1 is an inner surface machining apparatus for machining an inner surface of a hollow workpiece, and a spindle stock that rotatably supports a spindle that rotationally drives the hollow workpiece, and the spindle stock A tailstock arranged opposite to the workpiece, a machining unit that is inserted into the hollow workpiece and holds a tool shank that is movable in the radial direction, and is provided so as to be capable of moving forward and backward in the spindle stock and the tailstock. A pair of unit holding arbors that hold the machining unit inserted into the hollow workpiece non-rotatably from both sides, and an axial direction moving means for moving the machining unit in the axial direction in cooperation with the pair of unit holding arbors; A radial movement means for moving the tool shank held by the machining unit through the inside of the one unit holding arbor in the radial direction. It is characterized in that the configuration was.

  According to a second aspect of the present invention, in the inner surface processing apparatus for processing the inner surface of the hollow work, the main shaft that rotatably supports the main shaft that rotationally drives the hollow work, and the main shaft that is disposed to face the main shaft. A tailstock, a processing unit that holds a tool shank that is inserted into the hollow workpiece and is movable in the radial direction, and holds the processing unit, inserts it into the hollow workpiece, and removes the hollow workpiece from the hollow workpiece. A unit supply device that is retracted by leaving the machining unit in the hollow workpiece during machining, and the machining unit inserted in the hollow workpiece that is provided on the spindle stock and the tailstock so as to be movable back and forth. A pair of unit holding arbors that are more non-rotatably clamped, and an axial direction in which the machining unit is moved in the axial direction in cooperation with the pair of unit holding arbors And moving means, characterized in that constituted by the radial moving means for moving the tool shank which is held by the processing unit through said one unit holding the arbor radially.

  According to a third aspect of the present invention, in the first or second aspect, the processing unit includes at least two types of processing units holding different tool shanks, and these processing units are sequentially inserted into the hollow workpiece. It is characterized by being provided for processing.

  According to a fourth aspect of the present invention, in the third aspect, the hollow workpiece has an inner curved surface as a processing portion, and the inner curved surface is controlled by two-axis simultaneous control of the axial direction moving means and the radial direction moving means. It is characterized by being processed.

    According to the first aspect of the present invention, the machining unit holding the tool shank so as to be movable in the radial direction is inserted into the hollow workpiece that is rotationally driven by the main shaft, and the machining unit is inserted from both sides by the pair of unit holding arbors. Since it is held in a non-rotatable manner, the inner surface of the hollow workpiece is turned by moving the cutting tool in the axial direction and / or in the radial direction with the workpiece rotated in the same manner as a normal NC lathe. be able to. Accordingly, the machining accuracy is determined not by the shape of the cutting tool but by the relative feed accuracy of the workpiece and the cutting tool, and can be handled by changing the relative feed speed in accordance with the required machining accuracy. Further, since the throw-away tip can be used, the management of the blade is facilitated, and the cost of the blade can be greatly reduced.

  According to the second aspect of the present invention, the processing unit is gripped, inserted into the hollow workpiece and taken out from the hollow workpiece, and when the hollow workpiece is processed, the processing unit is left in the hollow workpiece and retracted. Since the apparatus is provided, the machining unit can be automatically held between the pair of unit holding arbors, and the machining unit can be easily and quickly replaced, thereby improving the machining efficiency.

  According to the invention of claim 3, since the machining unit is configured by at least two types of machining units holding different tool shanks, for example, even in a machine having machining points at two orthogonal points of the workpiece, Machining can be performed without turning, and it is also possible to easily handle the cutting tool with two types of machining units for roughing and finishing for particularly high precision workpieces.

  According to the invention of claim 4, since the inner curved surface of the hollow workpiece is processed by the two-axis simultaneous control in the axial direction and the radial direction, the inner curved surface can be easily processed, and various shapes of the inner curved surface can be obtained. It is possible to easily cope with a workpiece having a change in the program.

  Embodiments of the present invention will be described with reference to the drawings.

  First, the shape of the hollow workpiece, that is, the differential case W will be described with reference to FIGS. The differential case W supports concentric support holes W1 and W2 for supporting a pair of side gears, inner planes W3 and W4 slidably contacting the back of each side gear, and concentric supports for a pair of pinion gears engaged with the side gears. Support holes W5 and W6 and arcuate inner curved surfaces W7 and W8 which are in sliding contact with the back surface of each pinion gear. Further, the differential case W is formed with an opening window W9 for incorporating the side gear and the pinion gear in a direction perpendicular to the support holes W5 and W6 for supporting the pair of pinion gears. As will be described later, the differential case W is positioned and clamped by a positioning pin and a clamping device so that the centers of the support holes W1 and W2 coincide with the center of the main shaft, and the inner planes W3 and W4 and the inner curved surfaces W7 and W8 are formed by the processing unit. It is designed to be turned.

  3 is a view taken along the line AA in FIG. 2, but shows a state in which a unit supply device 60 described later is added for convenience.

  FIG. 1 shows the entire inner surface machining apparatus. Reference numeral 10 denotes a bed. A headstock 11 and a tailstock 12 are installed on the bed 10 so as to face each other. The headstock 11 is fixed on the bed 10, and the tailstock 12 is mounted on a guide base 13 provided on the bed 10 so as to be able to advance and retreat in the Z-axis direction. The tailstock 12 is moved forward and backward in the Z-axis direction by a servo motor 14 via a ball screw (not shown), and the amount of movement is detected by an encoder 14 a connected to the servo motor 14.

  As shown in FIG. 2, a fixed shaft 20 is fixed to the head stock 11 in parallel with the Z-axis direction. A cylindrical main shaft 21 is rotatably supported on the outer periphery of the fixed shaft 20 and is driven to rotate by a main shaft driving motor 22. A main shaft surface plate 21 a is attached to the tip end portion of the main shaft 21, and a differential case W is positioned on the main shaft surface plate 21 a in the rotational direction by a positioning pin 23 and clamped by a pin arbor chuck 24. As is well known, the pin arbor chuck 24 is provided with a plurality of (for example, three) pin arbors 24a on the circumference so as to be movable in an inclined direction. The outer periphery of the differential case W is clamped while being pressed against the reference surface of the main shaft face plate 21a. However, as the chuck 24, a clamp device having another configuration such as a three-claw chuck can be used.

  A unit holding arbor 25 is inserted through the center of the fixed shaft 20 by a key member 26 so as to be movable only in the axial direction. The unit holding arbor 25 is advanced and retracted by an arbor advance / retreat cylinder 27 installed at the rear of the fixed shaft 20. It has become so. The unit holding arbor 25 passes through the support hole W1 of the differential case W, and the tip is inserted into the hollow portion of the differential case W. At the tip of the unit holding arbor 25, a tapered polygonal surface 25a that fits into a processing unit to be described later is formed.

  A cylindrical unit holding arbor 31 is fixed to the tip of the tailstock 12 concentrically with the unit holding arbor 25. The unit holding arbor 31 passes through the support hole W2 of the differential case W, and the tip is It is inserted into the hollow portion of the differential case W. At the tip of the unit holding arbor 31, a tapered surface 31a that fits into a processing unit to be described later is formed. A driving shaft 30 is rotatably supported on the tailstock 12. A crank 33 is attached to the rear end of the drive shaft 30, and a cam follower 34 that is eccentric by a predetermined amount with respect to the axis of the drive shaft 30 is provided on the crank 33.

  An X-axis slide 35 is guided on the tailstock 12 so as to be slidable in a horizontal X-axis direction orthogonal to the Z-axis direction. The X-axis slide 35 is formed with an engagement hole 35a that engages with the cam follower 34, and the engagement hole 35a is elongated in the vertical direction perpendicular to the X-axis direction, as shown in FIG. The X-axis slide 35 is moved in the X-axis direction by a servo motor 36 via a ball screw mechanism (not shown), and the amount of movement is detected by an encoder 36 a connected to the servo motor 36. As a result, the linear motion of the X-axis slide 35 by the servo motor 36 is converted into an arc motion of the cam follower 34 and transmitted to the drive shaft 30.

  A driver 32 is supported at the tip of the drive shaft 30 so as to be relatively movable by a predetermined amount in the axial direction with its rotation restricted. The driver 32 penetrates through the unit holding arbor 31 and the tip protrudes from the unit holding arbor 31, and a square engagement portion 32a is formed at the protruding end. The driver 32 is normally held at the forward end position by the spring force of a spring (not shown) provided between the driver 32 and the drive shaft 30.

  Reference numeral 40 denotes a processing unit for processing the inner planes W3 and W4 that are inserted into the hollow portion of the differential case W when processing the differential case W, and the unit on the central axis O1 of the unit main body 41 of the processing unit 40 has the unit A polygonal tapered hole 41a that engages with a tapered polygonal surface 25a formed at the tip of the holding arbor 25 is formed. At the other end of the unit main body 41 on the central axis O <b> 1, a tapered hole 41 b that fits into a tapered surface 31 a formed at the tip of the unit holding arbor 31 is formed. A tool shank 42 is held on the unit main body 41 so as to be movable in the radial direction (X-axis direction), and one end of the tool shank 42 projects outward from the unit main body 41. At one end of the tool shank 42, a cutting tool 43 having throwaway tips 43a and 43b attached to both ends is fixed. The cutting tool 43 is biased by a predetermined amount in the radial direction from the center axis O1, and the inner planes W3, W4 of the differential case W can be sequentially turned by the throw away tips 43a, 43b by the radial movement of the tool shank 42.

  An eccentric pin 45 is rotatably accommodated on the central axis O1 through the tool shank 42 at the center of the unit main body 41. As shown in FIG. 3, the eccentric pin 45 is provided with an eccentric portion 45 a that engages with an engaging surface of an engaging hole 42 a formed in the tool shank 42, and an arc of the eccentric portion 45 a due to the rotation of the eccentric pin 45. The tool shank 42 can be moved in the radial direction by movement. A spring 46 is inserted between the tool shank 42 and the unit main body 41 so that the engagement surface of the engagement hole 42 a always abuts against the eccentric pin 45. One end of the eccentric pin 45 is formed with a square hole 45 b that engages with the square engaging portion 32 a of the driver 32, and the eccentric pin 45 is rotated by the rotation of the driver 32.

  Thus, the linear motion of the X-axis slide 35 is converted into the circular motion of the cam follower 34 and transmitted to the drive shaft 30, and the circular motion of the eccentric pin 45 due to the rotation of the drive shaft 30 is converted into the linear motion of the tool shank 42. By converting, the tool shank 42 can be operated in the same manner as the movement of the X-axis slide 35. Accordingly, it is possible to eliminate processing such as correcting the movement of the sine curve curve due to the arc with the calculation function of the NC device. The cam follower 34 and the eccentric pin 45 have different arc radii, and the cam follower 34 has a larger arc radius, so that the movement of the X-axis slide 35 is reduced and transmitted to the tool shank 42. Therefore, the program can be made the same as that of a normal NC lathe by inputting the magnification and converting it to have the same stroke as the Z-axis direction.

  The servo motor 36, the X-axis slide 35, the cam follower 34, the drive shaft 30, the driver 32, the eccentric pin 45, and the like constitute radial movement means 47 that moves the tool shank 42 in the radial direction.

  Further, the above-described servo motor 14, the unillustrated ball screw, the tailstock 12, the unit holding arbor 31, the unit holding arbor 25, the arbor advance / retreat cylinder 27, and the like move in the axial direction to move the machining unit 40 in the axial direction. The means 48 is constituted.

  FIG. 4 shows a processing unit 50 for processing the inner curved surfaces W7 and W8, and the basic configuration is the same as the processing unit 40 for processing the inner flat surface W3 and W4 described above. In order to avoid interference with the differential case W, the throwaway tip 52a for turning the inner curved surfaces W7, W8 is directly attached to the tool shank 52, and the outer shape of the unit body 51 is slightly changed. That is changing. Since the other points are the same, the same parts are denoted by the same reference numerals, and the description thereof is omitted.

  The processing units 40 and 50 for processing the inner planes W3 and W4 and the inner curved surfaces W7 and W8 are shown in FIGS. 3 and 5 by a unit gripping claw 61 of a unit supply device 60 composed of a robot or the like installed on the bed 10, for example. And is inserted into the differential case W through the opening window W9 of the differential case W. For this purpose, the unit main bodies 41 and 51 of the processing units 40 and 50 include a shaft portion 63 that fits in a centering hole 62 formed at the tip of the unit supply device 60, and a grip that is gripped by the unit gripping claws 61. The engaging portions 64 are formed, and the processing units 40 and 50 are positioned and gripped by the unit gripping claws 61.

  Next, the numerical controller 70 will be described. In FIG. 1, the numerical control device 70 includes a central processing unit (CPU) 71, a memory 72, and interfaces (I / F) 73 and 74. An interface (I / F) 73 is connected to an input / output device 75 for inputting control parameters necessary for NC control and an NC program.

  In addition, servo motor drive units (DUX, DUZ) 77 and 78 and a spindle drive unit (DUC) 79 are connected to the interface (I / F) 74. The servo motor drive units (DUX, DUZ) 77 and 78 and the spindle drive unit (DUC) 79 are driven by the central processing unit 71 to drive the servo motors 14 and 36 and the spindle drive motor 22.

  The memory 72 is provided with storage areas for storing control parameters and NC programs input from the input / output device 75, respectively. The servo motors 14 and 36 are controlled by deviation between the target position command of the NC program stored in the memory 72 and the current position signal from the encoders 14a and 36a, and control the positioning of the tailstock 12 to the target position in the Z-axis direction. At the same time, the tool shank 42 (53) is controlled to be positioned at a target position in the radial direction.

  The operation in the above embodiment will be described. The differential case W is manually or automatically conveyed by the conveying device while the unit holding arbor 25 is inserted into the support hole W1 and conveyed to the tip surface of the main shaft surface plate 21a, and the main surface plate 21a by the positioning pin 23 and the pin arbor chuck 24. It is positioned and clamped on the tip surface of the. In this state, first, the processing unit 40 for processing the inner planes W3 and W4 is gripped by the unit gripping claw 61 of the unit supply device 60 and inserted into the differential case W through the opening window W9 of the differential case W, and the central axis O1. Are positioned so as to coincide with the unit holding arbors 25 and 31.

  Next, the servo motor 14 is driven based on the NC command, and the tailstock 12 is advanced via a ball screw (not shown). As a result, the unit holding arbor 31 passes through the support hole W2 of the differential case W, the tip tapered surface 31a is fitted into the taper hole 41b of the unit main body 41, and the square engagement formed at the tip of the driver 32 is formed. The part 32 a is engaged with the square hole 45 b of the eccentric pin 45 of the processing unit 40. At this time, there are cases where the square engaging portion 32a of the driver 32 does not engage well with the square hole 45b of the eccentric pin 45, but the rectangular engaging portion 32a acts on the driver 32 by the subsequent rotation of the driver 32. The spring force of the spring is securely engaged with the square hole 45b.

  In this way, when the tailstock 12 is advanced to a predetermined position, the unit holding arbor 25 is subsequently advanced by the arbor advance / retreat cylinder 27, and the polygonal tapered surface 25 a at the tip thereof is the unit main body 41. The unit main body 41 is pressed against the unit holding arbor 31. As a result, both ends of the unit main body 41 are sandwiched between the unit holding arbors 25 and 31 with an equal holding force and are prevented from rotating.

  When both ends of the unit main body 41 are clamped by the unit holding arbors 25 and 31, the unit gripping claws 61 are opened, and the unit supply device 60 is withdrawn while leaving the processing unit 40 in the differential case W. In this original position state, the main shaft 21 is rotationally driven by the main shaft driving motor 22, and the differential case W is rotated. At the same time, the servo motor 14 is driven based on the NC command, the tailstock 12 is moved by a predetermined amount in the Z-axis direction (for example, the left direction in FIG. 2), and the throw-away tip 43a is cut with respect to one inner plane W3. Include. Next, the servo motor 36 is driven based on the NC command, and the X-axis slide 35 is slid by a predetermined stroke X1 in the X-axis direction. The linear motion of the X-axis slide 35 is converted into the circular motion of the cam follower 34, and the drive shaft 30 Is rotated by a predetermined amount at a predetermined speed. Accordingly, the eccentric pin 45 is rotated by a predetermined angle by the driver 32, the tool shank 42 is moved by a predetermined amount in the radial direction at a predetermined speed, and one inner plane W3 is turned by one throwaway tip 43a.

  When the turning of one inner plane W3 is completed, the servo motor 14 is driven in the opposite direction based on the NC command, and the tailstock 12 is moved by a distance determined in the right direction in FIG. The throw-away tip 43b is cut into the inner plane W4. Next, as described above, the drive shaft 30 is rotated by the servo motor 36, the tool shank 42 is moved in the radial direction via the driver 32 and the eccentric pin 45, and the other inner plane W4 is moved by the other throw-away tip 43b. Turning.

  As the tailstock 12 and the unit holding arbor 31 move in the Z-axis direction, the unit holding arbor 25 follows the unit holding arbor 31 against the arbor advance / retreat cylinder 27 or by the arbor advance / retreat cylinder 27. It is moved and always holds the processing unit 40 stably at both ends.

  When the machining of the pair of inner planes W3 and W4 is completed in this way, the main shaft 21 is stopped at a certain angular position, the tailstock 12 is returned to the original position in the Z-axis direction, and the tool shank 42 Is returned to the original position in the radial direction. In this state, the unit supply device 60 is operated, and the unit gripping claw 61 is inserted into the differential case W through the opening window W9 of the differential case W to grip the processing unit 40. Thereafter, the unit holding arbor 25 is retracted by the arbor advancing / retreating cylinder 27, and the tailstock 12 and the unit holding arbor 31 are retracted by a certain distance by the servo motor 14, and the tip of each unit holding arbor 25, 31 and driver 32 Are detached from the tapered holes 41a and 41b and the eccentric pin 45 of the unit main body 41, respectively. In this state, the unit supply device 60 is operated, and the processing unit 40 gripped by the unit gripping claws 61 is taken out from the differential case W through the opening window W9.

  Next, the unit gripping claw 61 of the unit supply device 60 grips the processing unit 50 for processing the inner curved surfaces W7 and W8 and supplies the processing unit 50 into the differential case W. In the same manner as described above, both ends of the processing unit 50 are sandwiched between the unit holding arbors 25 and 31 and are prevented from rotating. Thereafter, the unit gripping claw 61 is opened, and the unit supply device 60 is connected to the processing unit 50. Is left in the differential case W and evacuated.

  Thereafter, the main shaft 21 is rotationally driven by the main shaft drive motor 22, the differential case W is rotated, and then the tailstock 12 is moved to a predetermined position in the Z-axis direction by the servo motor 14 and the drive shaft 30 is servoed. The rotation is controlled by the motor 36, the tool shank 52 is moved to a predetermined position in the radial direction, and the throw-away tip 52a is positioned at the machining start point shown in FIG. In this state, the servo motors 14 and 36 are simultaneously controlled based on the NC command, whereby the throw-away tip 52a is moved along the inner spherical surfaces W7 and W8, and the inner spherical surfaces W7 and W8 are simultaneously turned. .

  When the inner spherical surfaces W7 and W8 are turned, the main shaft 21 is stopped at a fixed angular position, the tailstock 12 and the tool shank 52 are returned to their original positions, and the unit supply device 60 is operated to hold the unit. The claw 61 holds the processing unit 50 in the differential case W. Subsequently, the tailstock 12 and the unit holding arbor 25 are retracted to the original positions, and the processing unit 50 is taken out from the differential case W by the unit supply device 60. Thereafter, the positioning clamp of the differential case W that has been processed is released, and the differential case W is carried out manually or by a conveying device.

  In the above-described embodiment, the example in which the inner planes W3 and W4 and the inner spherical surfaces W7 and W8 of the differential case W are turned has been described. However, the present invention is not limited to the differential case, and the inner surface processing of the same type of hollow workpiece is performed. It can be applied to.

  In the above-described embodiment, the inner surface processing apparatus in which the headstock 11 and the tailstock 12 are arranged to face each other on the bed 10 is described. However, the bed is configured by a slant bed like a normal NC lathe, A headstock and tailstock can be mounted on the slant bed.

  In the above-described embodiment, the linear motion of the X-axis slide 35 is transmitted to the tool shanks 42 and 52 via two sets of eccentric mechanisms, and the tool shanks 42 and 52 are moved in the radial direction. The radial movement means 47 for moving the shanks 42 and 52 in the radial direction is not limited to the embodiment, and the axial movement means 48 is configured by the tailstock 12 and the like that are movable in the Z-axis direction. However, the movement in the Z-axis direction can take various forms in addition to moving the tailstock itself. Further, the radial movement means 47 is provided on the tailstock 12 side. It can also be provided on the headstock side.

  In the above-described embodiment, an example in which two types of inner surfaces (inner planes W3, W4, inner spherical surfaces W7, W8) are turned using two types of processing units 40, 50 has been described. The invention may turn one inner surface using at least one machining unit.

  Thus, the specific configurations described in the embodiments are merely examples of the present invention, and the present invention is not limited thereto, and can take various forms without departing from the gist of the present invention. Of course.

1 is an overall view of an inner surface machining apparatus for a hollow work showing an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of a main part of FIG. 1. It is sectional drawing cut | disconnected along the AA line of FIG. It is sectional drawing cut | disconnected along the BB line of FIG. It is a figure which shows the processing state by a different processing unit. It is sectional drawing cut | disconnected along CC line of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Bed, 11 ... Main stand, 12 ... Tailstock, 14 ... Servo motor, 20 ... Fixed shaft, 21 ... Main shaft, 22 ... Main shaft drive motor, 23 ... Positioning pins, 24 ... Clamping device (pin arbor chuck), 25 ... Unit holding arbor, 27 ... Arbor advance / retreat cylinder, 31 ... Unit holding arbor, 30 ... Drive shaft, 32 ... Driver, 34 ... Cam follower, 35 ... X-axis slide, 36 ... Servo motor, 40, 50 ... Processing unit, 41, 51 ... Unit body, 42, 52 ... Tool shank, 43a, 43b, 52a ... throw-away tip, 45 ... eccentric pin, 46 ... spring, 47 ... radial movement means, 48 ... axial movement means, 60 ...・Knit feeder, 61 ... unit gripping claws, W ... differential case, W3, W4, ... inner plane, W7, W8 ... inner curved surface, W9 ... opening window.

Claims (4)

In an inner surface machining apparatus for machining an inner surface of a hollow workpiece, a spindle head that rotatably supports a spindle that rotationally drives the hollow workpiece, a tailstock arranged to face the spindle table, and a tool shank with a radius A machining unit that is movably held in a direction and is inserted into the hollow workpiece, and the machining unit that is provided on the headstock and the tailstock so as to be movable forward and backward is inserted into the hollow workpiece and cannot be rotated from both sides. A pair of unit holding arbors sandwiched between, a pair of unit holding arbors, axial movement means for moving the processing unit in the axial direction in cooperation with the pair of unit holding arbors, and the one unit holding arbor holding the processing unit. An inner surface machining apparatus for a hollow workpiece, characterized by comprising a radial movement means for moving the tool shank in a radial direction. In an inner surface machining apparatus for machining an inner surface of a hollow workpiece, a spindle head that rotatably supports a spindle that rotationally drives the hollow workpiece, a tailstock arranged to face the spindle table, and a tool shank with a radius A machining unit that is movably held in the direction and inserted into the hollow workpiece, and is inserted into the hollow workpiece and taken out from the hollow workpiece. When machining the hollow workpiece, the machining unit is hollow. A unit supply device that is left behind in the workpiece and retracted, and a pair of gripping the processing unit inserted in the hollow workpiece so as not to be rotatable from both sides. A unit holding arbor, an axial direction moving means for moving the processing unit in the axial direction by cooperation of the pair of unit holding arbors, Inner surface machining apparatus of the hollow workpiece, characterized by being configured by the radial moving means for moving the tool shank which is held by the processing unit in the radial direction through the knit holding arbor. In Claim 1 or Claim 2, the said processing unit consists of at least two types of processing units holding different tool shanks, and these processing units are sequentially inserted into the hollow workpiece and used for processing. A device for processing an inner surface of a hollow workpiece, characterized in that: 4. The hollow work according to claim 3, wherein the hollow workpiece has an inner curved surface as a processing portion, and the inner curved surface is machined by two-axis simultaneous control of the axial direction moving means and the radial direction moving means. An internal surface processing device for hollow workpieces.

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