JP2007130715A - Collet chuck device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a collet chuck device facilitating a set up change accompanied by the change of a workpiece by assembling a centering support member and a collet sleeve in a state of being centered. <P>SOLUTION: The collet chuck device is equipped with the centering support member 26 into which a center 28 is fitted, a centering fitted surface 26a fitted to a fitting part (spigot joint part) 25 formed on a spindle 13 is provided on the centering member 26, the centering member and a second collet sleeve 31 holding a workpiece W are centered and integrally joined to compose a sub assembly. The centering member and the second collet sleeve to be sub-assembled are detachably mounted to the spindle according to the kind of the workpieces. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a collet chuck device that is provided in a spindle device of a machine tool and clamps a workpiece, and more particularly to a collet chuck device that facilitates setup change accompanying a change of a workpiece.

  As drive means for rotationally driving a workpiece supported by a center, a collet chuck device that clamps a shaft end of the workpiece with a collet sleeve that can be expanded and contracted is widely used. In this type of collet chuck device, since the collet sleeve cannot be enlarged or reduced, it is necessary to replace the collet sleeve with a collet sleeve corresponding to the diameter of the workpiece when the workpiece is changed.

Conventionally, a collet chuck device described in Patent Document 1 is known as a collet chuck device that facilitates setup replacement. In the one described in Patent Document 1, the collet sleeve is composed of a main collet and an auxiliary collet, and at the time of changing the setup due to the change of the workpiece, the auxiliary collet is removed from the main collet, and another auxiliary collet is placed in the main collet. It is designed to be inserted.
Japanese Patent Laid-Open No. 9-12305 (paragraph 0010, FIG. 1)

  However, in the one described in Patent Document 1 described above, the rear end of the auxiliary collet is simply fitted into the recess provided at the front end of the main shaft (connecting face plate). There is a problem that accuracy is not guaranteed and long-time setup change is required to ensure centering accuracy.

  Further, depending on the type of workpiece, it is necessary to replace not only the auxiliary collet but also the center. However, in the case described in Patent Document 1, the center cannot be easily replaced.

  The present invention has been made to solve the above-described conventional problems, and by making the sub-assemblies with the center support member and the collet sleeve centered, it is easy to change the setup accompanying the change of the workpiece. An object of the present invention is to provide a collet chuck device.

  In order to solve the above-mentioned problems, the invention described in claim 1 includes a rotatable main shaft, a piston slidably fitted in a cylinder formed on the main shaft, and a tapered surface provided on the piston. A first collet sleeve provided with an engaging tapered surface on the outer periphery; a second collet sleeve disposed inside the first collet sleeve and expanded and contracted by the first collet sleeve to grip the outer periphery of the workpiece; and the workpiece In the collet chuck device having a center for supporting the center, the center support member is provided with a center support member to which the center is fitted, and the center support member is provided with a centering fitting surface for fitting to a fitting portion formed on the main shaft, The center support member and the second collet sleeve are centered and integrally coupled to form a sub-assembly, and the sub-assembled center support member and the second collet sleeve are It is characterized in that it has to be detachably attached to the main spindle depending on the type of crop.

  According to a second aspect of the present invention, in the first aspect, the sub-assembly fits a centering fitting surface formed on the inner periphery of the second collet sleeve to a fitting portion formed on the outer periphery of the center support member. And are integrally coupled.

  According to a third aspect of the present invention, in the first or second aspect, the fitting portion is configured by an inlay portion.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the slit portion formed in the first collet sleeve and the slit portion formed in the second collet sleeve are arranged in a circumferential direction. They are arranged at the same angular phase.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the sub-assembly is provided with a phase reference for making the phase of the workpiece coincide with the phase of the main shaft. Is.

  According to the first aspect of the present invention, the center support member that fits into the fitting portion formed on the main shaft and the second collet sleeve that grips the outer periphery of the workpiece are centered and integrally coupled to form a sub-assembly. In addition, since the center support member and the second collet sleeve that are sub-assembled are detachably attached to the main shaft in accordance with the type of workpiece, the center support member and the second collet sleeve that have been sub-assembled in advance outside the machine are attached. The second collet sleeve can be accurately centered with respect to the center only by being mounted on the main shaft, and the setup change can be performed quickly and easily.

  According to the second aspect of the present invention, the sub-assembly is integrally joined by fitting the centering fitting surface formed on the inner periphery of the second collet sleeve to the fitting portion formed on the outer periphery of the center support member. Therefore, centering of the center support member and the second collet sleeve can be easily performed outside the machine.

  According to the invention of claim 3, since the fitting portion is formed by the spigot portion, the same effect as that of claim 1 or claim 2 can be expected.

  According to the fourth aspect of the present invention, the slit portion formed in the first collet sleeve and the slit portion formed in the second collet sleeve are arranged at the same angular phase in the circumferential direction, and therefore engage with each other. The engaging surfaces of the first and second collet sleeves are not scraped by the edges of the slit portions, and the centering accuracy with respect to the center can be ensured for a long period of time.

  According to the fifth aspect of the present invention, the sub-assembly is provided with a phase reference for making the phase of the workpiece coincide with the phase of the main shaft. Therefore, a workpiece such as a camshaft or a crankshaft that requires the phase reference. Can be used.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a collet chuck device 10 that clamps a workpiece W that requires a phase reference, such as a camshaft, for example. The collet chuck device 10 is a spindle device of a machine tool such as a grinding machine. 11 is attached.

  A main shaft 13 is rotatably supported by the main shaft device 11, and a main shaft surface plate 14 is fixed to a front end surface of the main shaft 13 by bolts 15. A cylindrical member 17 is fixed to the distal end surface of the main shaft face plate 14 by a bolt 18, and a base end portion of a first collet sleeve 19 is fixed to the inner side of the cylindrical member 17 by a bolt 20 concentrically with the main shaft center O 1. Yes. A cylinder 21 for collet operation is formed between the cylindrical member 17 and the first collet sleeve 19, and a piston 22 is fitted on the cylinder 21 so as to be slidable in the direction of the main shaft axis. The piston 22 is prevented from rotating with respect to the main shaft face plate 14 by a rotation stopper pin 23. Oil passages 24 a and 24 b formed in the cylindrical member 17 and the main shaft face plate 14 are respectively connected to the front and rear chambers 21 a and 21 b of the cylinder 21 defined by the piston 22, and these oil passages 24 a and 24 b are formed in the main shaft 13. It is connected to a pressure oil supply source (not shown) through an oil passage.

  The front end portion of the piston 22 extends forward of the main shaft 13, and the outer peripheral surface thereof is formed in a cylindrical shape that is slidably fitted to the inner peripheral surface of the cylindrical member 17. The inner periphery has a radial direction toward the front end. A tapered surface 22a inclined inward is formed. Similarly, the front end portion of the first collet sleeve 19 extends forward of the main shaft 13, and a tapered surface 19 a having a shape matching the tapered surface 22 a of the piston 22 is formed on the outer periphery thereof, and the inner peripheral surface is formed in a cylindrical shape. Has been. As a result, the piston 22 is slid backward (to the left in FIG. 1) of the main shaft 13, so that the tip of the first collet sleeve 19 is reduced inward by the tapered surface 22 a of the piston 22. It has become.

  An inlay portion 25 is formed on the inner periphery of the main shaft face plate 14 concentrically with the main shaft center O1, and a centering fitting surface 26a formed on the outer periphery of the center support member 26 is detachably fitted to the inlay portion 25. It has come to be. The center support member 26 is attached to the main shaft face plate 14 with the angle phase regulated by the phase determining pin 27. At the center of the center support member 26, a center 28 for center-supporting one end of the workpiece W is fitted on the spindle center O1.

  A flange portion 26b that abuts on the tip surface of the main shaft face plate 14 is formed at the tip portion of the center support member 26, and the outer periphery of the flange portion 26b is concentric with the centering fitting surface 26a as shown in FIG. An inlay portion 30 is formed on the inner surface. A centering fitting surface 31 a formed on the inner periphery of the proximal end portion of the second collet sleeve 31 that grips the outer periphery of the workpiece W is centered and fitted to the inlay part 30. The end portion is centered and fixed to the center support member 26 by a bolt 32. A cylindrical contact surface 31b that can contact the inner peripheral surface of the first collet sleeve 19 is formed on the outer periphery of the tip portion of the second collet sleeve 31, and the outer periphery of the shaft end of the workpiece W is formed on the inner periphery. A gripping surface 31c for gripping is formed.

  The inner diameter of the gripping surface 31 c of the second collet sleeve 31 is set to a dimension corresponding to the outer diameter of the shaft end of the workpiece W. A plurality of second collet sleeves 31 having different inner diameters according to the type of workpiece are prepared in advance, and are appropriately exchanged according to changes in the workpiece W. Prior to mounting the second collet sleeve 31 to the main shaft 13 (main shaft device 11), the centering fitting surface 31a is fitted in advance to the inlay portion 30 of the center support member 26, and then centered and assembled. In this sub-assembled state, it is detachably attached to the front end surface of the main shaft face plate 14 by a bolt 33 that passes through the second collet sleeve 31 and the center support member 26.

  A ring-shaped phasing block 35 is detachably attached to the front end surface of the center support member 26 by a bolt 36, and an engagement groove 35a that is chamfered at a predetermined angular position of the phasing block 35 (see FIG. 3). Are formed in the radial direction. A phase reference pin W1 attached to the end face of the workpiece W is engaged with the engagement groove 35a, and the workpiece W is positioned at a predetermined angular position with respect to the main shaft 13.

  A thin portion is formed at the axial center of each of the first and second collet sleeves 19 and 31, and the same number is provided on the circumference of each of the first and second collet sleeves 19 and 31. A plurality of (six in the embodiment) slit portions 19b and 31d are formed. Thereby, the front-end | tip part of the 1st and 2nd collet sleeves 19 and 31 can be elastically deformed (expandable / contractable) in the radial direction. As apparent from FIG. 2, the slit portions 19b and 31d of the first and second collet sleeves 19 and 31 are arranged in the same phase, and the collet sleeves 19 and 31 are brought into contact with each other by the edge portions of the slit portions 19b and 31d. The surface is not cut.

  Next, the operation in the embodiment having the above-described configuration will be described. Prior to machining the workpiece W, first, the setup change to be replaced with the second collet sleeve 31 corresponding to the workpiece W will be described.

  The bolt 33 is removed from the front of the spindle device 11, and in this state, the center support member 26 is pushed out from the rear of the spindle 13 by using a jig, so that the center support member 26 and the second collet sleeve 31 are in the sub-assembled state. 14 is removed.

  Subsequently, outside the machine, the bolt 32 is removed, the used second collet sleeve 31 and the phasing block 35 are removed from the center support member 26, and then the second corresponding to the workpiece W to be processed next. The centering fitting surface 31a of the collet sleeve 31 is fitted to the inlay portion 30 of the center support member 26, centered, and fixed in this state by the bolt 32. Further, the phasing block 35 corresponding to the workpiece W to be processed next is fixed to the center support member 26 by the bolt 36.

  In this manner, the centering fitting surface 26a is formed on the spigot portion 25 of the main shaft face plate 14 at an angular phase at which the centering fitting surface 26 of the center support member 26 is engaged with the phasing pin 27 in the sub-assembled state. They are fitted and fixed to the main shaft face plate 14 with bolts 33. Thereby, the second collet sleeve 31 is centered and positioned on the concentricity (spindle rotation center O1) with the center.

  In this case, if a plurality (at least two) of the center support members 26 are prepared, while the previous workpiece W is being processed, the other center support member 26 is scheduled to be placed next to the center support member 26 outside the machine. The second collet sleeve 31 corresponding to the workpiece W can be centered and assembled, and the setup change accompanying the change of the workpiece W can be performed more quickly.

  In an appropriate state, the workpiece W to be machined is mounted on the spindle device 11 by an operator's manual operation or using a workpiece carry-in / out device. For mounting the workpiece W, the phase reference pin 36 provided on the workpiece W is engaged with the engagement groove 35a of the phase determination block 35, and the center hole formed at the shaft end of the workpiece W is engaged with the center 28. In this state, when the pressure oil is supplied from the pressure oil supply source (not shown) to the front chamber 21a of the cylinder 21 through the oil passage 24a, the piston 22 is retracted, and thereby the taper surface 22a of the piston 22 The distal end portion of the first collet sleeve 19 is reduced in diameter, and as a result, the distal end portion of the second collet sleeve 31 is reduced in diameter and the workpiece W is gripped.

  In this case, the second collet sleeve 31 attached to the spindle device 11 has the center support member 26 centered with respect to the spindle face plate 14 by the inlay portions 25 and 30 as described above, and the center support member 26 On the other hand, since the second collet sleeve 31 is centered, the second collet sleeve 31 is attached to the main shaft face plate 14 only by attaching the center support member 26 and the second collet sleeve 31 previously sub-assembled outside the machine to the main shaft surface plate O1. It can be positioned on the top, eliminating the need for complicated centering operations.

  In addition, after attaching the 2nd collet sleeve 31 to the main axis | shaft apparatus 11, you may add the process of confirming the centering precision of the 2nd collet sleeve 31 with respect to the center 28 as needed. The confirmation of the centering accuracy can be performed by measuring the deflection of the inner circumference of the second collet sleeve 31 in a state where the second collet sleeve 31 is operated to the workpiece gripping position. If the required centering accuracy cannot be ensured, necessary measures such as re-execution of the centering operation are performed again.

  When the machining of the workpiece W is completed and the workpiece W is removed from the spindle device 11, the supply and discharge of the pressure oil is switched, and the pressure oil is supplied to the rear chamber 21b of the cylinder 21 through the oil passage 24b. Is done. As a result, the piston 22 is advanced, and the distal ends of the first collet sleeve 19 and the second collet sleeve 31 are expanded in diameter by the elastic restoring force, and the workpiece W is released. In this state, the workpiece W is unloaded from the spindle device 11 manually by the operator or by the workpiece loading / unloading device.

  According to the above-described embodiment, since the second collet sleeve 31 can be centered on the center support member 26 by the inlay portion 30 outside the machine in advance, the center support member 26 to which the second collet sleeve 31 is attached is attached to the main shaft face plate 14. The second collet sleeve 31 can be reliably positioned on the spindle center O1 simply by fitting with the inlay portion 25 formed in the above, and a complicated centering operation can be eliminated.

  Further, since the first and second collet sleeves 19 and 31 are positioned so that the phases of the slit portions 19b and 31d coincide with each other, the inner periphery of the first collet sleeve 19 and the second collet sleeve 31 that are engaged with each other. The contact surface with the outer periphery of the first and second collet sleeves 19 and 31 is prevented from being worn away by the edges of the slit portions 19b and 31d. Therefore, the centering accuracy of the second collet sleeve 31 with respect to the center 28 is not impaired by long-term use.

  In the above-described embodiment, the example in which the spigot portion 25 for fitting the center support member 26 is provided on the main shaft face plate 14 attached to the main shaft 13 has been described. However, the main shaft face plate 14 may be integrally formed on the main shaft 13. it can. Therefore, the main shaft in the claims is not limited to the main shaft 13 in the embodiment, but includes a member (for example, the main shaft face plate 14) attached to the main shaft 13 integrally.

  In the above-described embodiment, the center support member 26 that is centered and assembled with the second collet sleeve 31 by the inlay portion 30 is fitted into the inlay portion 25 formed on the main shaft face plate 14, The second collet sleeve 31 is attached to the center support member 26 so that the position of the second collet sleeve 31 can be adjusted in the radial direction, and the second collet sleeve 31 is adjusted in the radial direction with respect to the center support member 26 outside the machine and centered. In this state, the second collet sleeve 31 may be integrally coupled to the center support member 26 by bolts.

  Further, in the above-described embodiment, the center support member 26 or the second collet sleeve 31 is centered and fitted to the spigot portions 25 and 30 formed on the main shaft face plate 14 or the center support member 26. The fitting out is not necessarily limited to the inlay part, and may be a taper.

  In the above-described embodiments, the collet chuck device that clamps a workpiece such as a camshaft that requires a phase reference has been described. However, the workpiece that requires a phase reference is not limited to a camshaft, The present invention can also be applied to a workpiece having a shaft or an eccentric portion. The present invention can also be applied to a cylindrical workpiece that does not require a phase reference, and the phasing block that engages the phase reference pin of the workpiece W is not necessarily a requirement for the present invention.

It is sectional drawing of the collet chuck apparatus which shows embodiment of this invention. It is A arrow directional view of FIG. It is a figure which shows the sub assembly state of the center support member and 2nd collet sleeve in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Collet chuck apparatus, 11 ... Main shaft apparatus, 13 ... Main shaft, 14 ... Main shaft surface plate, 19 ... First collet sleeve, 19a ... Tapered surface, 19b ... Slit part, 21 ... Cylinder, 22 ... Piston, 22a ... Tapered surface, 25 ... fitting part (inlay part), 26 ... center support member, 26a ... centering fitting surface, 26b ... flange part, 28 ... center, 30 ... fitting part (inlay part), 31 ... second collet sleeve, 31a ... Centering fitting surface, 31b ... Contact surface, 31c ... Holding surface, 31d ... Slit part, 35 ... Phase determining block, W ... Workpiece, W1 ... Phase reference pin.

Claims (5)

  A rotatable main shaft, a piston slidably fitted in a cylinder formed on the main shaft, a first collet sleeve having a tapered surface that engages a tapered surface provided on the piston, In a collet chuck device having a second collet sleeve that is disposed inward of the first collet sleeve and that is expanded and contracted by the first collet sleeve and grips the outer periphery of the workpiece, and a center that supports the workpiece as a center, the center is fitted. The center support member is provided with a centering fitting surface that fits into a fitting portion formed on the main shaft, and the center support member and the second collet sleeve are centered and integrally coupled. Thus, the sub-assembly is configured, and the sub-assembled center support member and the second collet sleeve are detachably attached to the main shaft according to the type of workpiece. Collet chuck device being characterized in that the.   2. The collet chuck according to claim 1, wherein the sub-assembly is integrally coupled by fitting a centering fitting surface formed on the inner periphery of the second collet sleeve to a fitting portion formed on the outer periphery of the center support member. apparatus.   3. The collet chuck device according to claim 1, wherein the fitting portion is configured by an inlay portion.   4. The collet according to claim 1, wherein the slit portion formed in the first collet sleeve and the slit portion formed in the second collet sleeve are arranged at the same angular phase in the circumferential direction. Chuck device. 5. The collet chuck device according to claim 1, wherein a phase reference for matching the phase of the workpiece and the phase of the main shaft is provided in the sub-assembly. 6.

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