JP2008213055A - Workpiece holding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an epoch-making workpiece holding device displaying an unprecedented action effect. <P>SOLUTION: This workpiece holding device holds a workpiece 1. A base body 11 provided with a workpiece holding part 2 to hold the workpiece 1 is provided with a centering part 4 for centering the workpiece 1 by abutting and supporting a reference surface which is an outer peripheral surface of the workpiece 1 and is other than a surface to be processed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a work holding device.

  For example, a constant velocity joint 10 used in a driving portion of an automobile includes an inner ring 3 fitted on the drive shaft 6 as shown in FIG. 6, a bearing ring 9 fitted on the inner ring 3, and this bearing. An outer ring 7 fitted on the ring 9, and a steel ball 8 disposed between the outer peripheral surface of the inner ring 3 and the inner peripheral surface of the outer ring 7 through the window 9 a of the support ring 9. The inner ring 3, the support ring 9 and the outer ring 2 are both rotated by the rotation of the drive shaft 6. In addition, the same code | symbol was attached | subjected to the same component as a present Example.

  The outer peripheral surface portion 3b (between the recesses 3a) of the inner ring 3 and the inner peripheral surface portion 9b of the support ring 9 with which the outer peripheral surface portion 3b abuts are formed in a matching arc shape (axial direction) (in the radial direction). The outer peripheral surface portion 9c of the support ring 9 and the inner peripheral surface portion 7b of the outer ring 7 with which the outer peripheral surface portion 9c abuts are formed in a matching arc shape (axial direction) (radial direction). Therefore, the bearing ring 9 and the outer ring 7 are swung with respect to the inner ring 3 with the rolling of the steel ball 8 (however, the bearing ring 9 and the outer ring are moved with respect to the inner ring 3). 7 is a non-rotating state.)

  By the way, in the manufacture of the inner ring 3 described above, first, the ring body 31 in a state where the finishing margin is left by the cutting process is provided, and subsequently, the ring body 31 is subjected to a quenching process. The finish polishing process is completed in order to remove the finishing margin, and this finish polishing process is performed by, for example, a work holding device disclosed in JP-A-2002-239820 (hereinafter referred to as a conventional example). This is performed with the body 31 held.

  Specifically, in the conventional example, as shown in FIG. 7, a draw bar 52 arranged in a hole 51a of a base 51 configured to be rotatable and pushed and pulled by a cylinder mechanism (not shown), A claw member 53 that operates by pulling movement, a work holding body 54 that is pulled in with a base end locked by a retraction operation of the claw member 53, and a hole 51a of the base 51 provided at the distal end of the base 51 This is a structure including a cylindrical holding cylinder 55 having a hole 55b in a communicating state and a work holding part 56 composed of the work holding body 54.

  When the ring body 31 is held in this conventional example, a work holding body 54 fitted with the ring body 31 is inserted into the holding cylinder 55, and a base end portion of the work holding body 54 is pulled by the draw bar 52 to operate. 53, the front and rear end portions of the ring body 31 are formed by the base end of the workpiece contact portion 54a provided near the tip of the workpiece holder 54 and the workpiece contact portion 55a at the tip of the holding cylinder 55. The ring body 31 is held, and then the base body 51 is rotated to rotate the ring body 31, and the outer peripheral surface of the rotating ring body 31 is subjected to finish polishing.

JP 2002-239820 A

  However, the conventional example has a problem that good finishing accuracy cannot be obtained.

  That is, in the conventional example, the ring body 31 is centered on the basis of the work holding body 54 inserted into the hole 31c of the ring body 31. The hole 31c of the ring body 31 is in contact with the work holding body 54. Because of the slightly larger diameter (because there is play), when the work holding body 54 is inserted into the hole 31c of the ring body 31 and the ring body 31 is held, the axis of the ring body 31 and the work holding body 54 There is a problem that the shaft core (rotating shaft core) is displaced (this displacement is increased as the holding is strengthened). That is, the conventional example has no special centering mechanism, and the workpiece holding mechanism also serves as the centering mechanism.

  The present invention solves the above-described problems and provides an epoch-making work holding device that exhibits unprecedented effects.

  The gist of the present invention will be described with reference to the accompanying drawings.

  A workpiece holding device for holding a workpiece 1, and a base body 11 provided with a workpiece holding portion 2 for holding the workpiece 1 is in contact with a reference surface other than the surface to be processed as an outer peripheral surface of the workpiece 1. The present invention relates to a work holding device characterized in that a centering portion 4 for centering the work 1 by being supported is provided.

  Further, a work holding device for holding the work 1 is provided on a base 11 provided with a work holding part 2 for holding the work 1 before the work 1 is held by the work holding part 2. The workpiece holding device is characterized in that a centering portion 4 for centering the workpiece 1 is provided by abutting and supporting the outer peripheral surface of the workpiece 1 on a reference surface other than the surface to be processed.

  Further, a work holding device for holding the work 1 is provided on a base 11 provided with a work holding part 2 for holding the work 1 before the work 1 is held by the work holding part 2. A workpiece holding device is provided with a centering portion 4 for press-fitting to a reference surface other than the surface to be processed as a peripheral surface of the workpiece 1 by press-fitting the workpiece 1 and centering the workpiece 1 It is concerned.

  The work holding apparatus according to any one of claims 1 to 3, wherein the centering portion 4 is a support body 4a projecting in a plurality from the base 11 in an annular shape. It concerns the device.

  The work holding apparatus according to any one of claims 1 to 4, wherein the support body 4a has expansion / contraction elasticity.

  Further, in the workpiece holding device according to any one of claims 1 to 5, a ring-shaped workpiece 1 is adopted as the workpiece 1, and the workpiece holding portion 2 is inserted into the inner hole 1c of the workpiece 1. The present invention relates to a work holding device characterized in that it has an insertion portion 14 and is configured to sandwich and hold the front and rear ends of the ring-shaped work 1.

  Further, in the workpiece holding device according to any one of claims 1 to 5, a ring-shaped workpiece 1 is adopted as the workpiece 1, and the workpiece holding portion 2 is inserted into the inner hole 1c of the workpiece 1. A workpiece holder 14 having an insertion portion 14 and further provided with an abutting portion 14a that abuts against the front end of the ring-shaped workpiece 1, and a rear end of the ring-shaped workpiece 1 provided on the base 11 It is comprised by the contact part 15a which contacts, It is comprised so that the said workpiece | work holding body 14 may be pulled and the said ring-shaped workpiece | work 1 may be clamped and hold | maintained by both contact parts 14a and 15a. The present invention relates to a work holding device.

  Further, in the workpiece holding device according to any one of claims 1 to 7, the workpiece 1 includes an inner ring 3 fitted on the drive shaft 6, and a support ring 9 fitted on the inner ring 3. An outer ring 7 fitted on the support ring 9 and a steel ball 8 disposed between an outer peripheral surface of the inner ring 3 and an inner peripheral surface of the outer ring 7 through a window 9a of the support ring 9. The workpiece holding device is characterized by being a workpiece 1 in a previous stage of manufacturing the inner ring 3 in the constant velocity joint 10 having the following.

  9. The work holding device according to claim 8, wherein the reference surface other than the surface to be processed which is the outer peripheral surface of the work 1 is a portion which becomes a recess 3 a provided on the outer periphery of the inner ring 3 in the constant velocity joint 10. The present invention relates to a work holding device.

  Since the present invention is configured as described above, unlike the above-described conventional example, an epoch-making work holding device that can hold a work so as to obtain good finishing accuracy and that exhibits an unprecedented effect. Become.

  The preferred embodiment of the present invention will be briefly described with reference to the drawings showing the operation of the present invention.

  When the work 1 is held, centering is performed by abutting and supporting the outer peripheral surface of the work 1 on a reference surface other than the surface to be processed by the centering portion 4 provided on the base 11, and the centering is performed. The workpiece 1 in the state is held by the workpiece holder 2.

  Therefore, unlike the above-described conventional example, the finishing process is not performed in a state in which the center is shifted due to play, so that the workpiece 1 can be held so that always good finishing accuracy can be obtained. This is a very effective holding means when a particularly high machining accuracy is required, for example, when the inner ring 3 in the constant velocity joint 10 is manufactured.

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

  The present embodiment is a work holding device for holding a work 1, and a base 11 provided with a work holding portion 2 for holding the work 1 is used as a reference surface other than the surface to be processed as an outer peripheral surface of the work 1. A centering portion 4 for centering the workpiece 1 by abutting and supporting the workpiece 1 is provided.

  In the present embodiment, as the work 1, as shown in FIG. 6, the inner ring 3 fitted on the drive shaft 6, the support ring 9 fitted on the inner ring 3, and the support ring 9 are fitted. A constant velocity joint 10 having an outer ring 7 and a steel ball 8 disposed between an outer peripheral surface of the inner ring 3 and an inner peripheral surface of the outer ring 7 through a window 9a of the support ring 9. A ring-shaped workpiece 1 is used before the inner ring 3 is a finished product (before the outer peripheral surface portion 1b is formed into an arc shape).

  Specifically, on the outer periphery of the ring-shaped workpiece 1, six outer peripheral surface portions 1b (convex portions) serving as a surface to be processed are formed between six concave portions 1a formed at equal intervals. The ring-shaped workpiece 1 is formed accurately (highly accurate) except for the outer peripheral surface portion 1b. Finally, the outer peripheral surface portion 1b is formed in an arc shape (axial direction and radial direction).

  The concave portion 1a and the front and rear ends of the ring-shaped workpiece 1 serve as a reference surface for centering when the outer peripheral surface portion 1b is held in the present embodiment when finishing the cutting process.

  Note that the workpiece 1 is not limited to the above-described one, and can be appropriately adopted as long as the configuration exhibits the characteristics of the present embodiment.

  Hereinafter, each component according to the present embodiment will be described in detail.

  The base 11 (main shaft) is a shaft-like body that is rotatably provided by a rotation mechanism (not shown) as shown in FIG. 1, and a work holding part 2 is provided at the tip of the base 11. .

  Specifically, the work holding part 2 is in contact with the work holding body 14 provided with the contact part 14 a that comes into contact with the front end of the ring-shaped work 1 and the rear end of the ring-shaped work 1 provided on the base 11. The abutting portion 15a is configured to pull the work holding body 14 so as to sandwich and hold the ring-shaped workpiece 1 between the abutting portions 14a and 15a.

  The work holding body 14 is disposed in a hole 11a provided at the distal end portion of the base body 11, and the base end portion is locked by the pulling operation of the claw member 13 that is operated by the push-pull movement of the draw bar 12.

  3 and 4, the workpiece holder 14 has an insertion portion 14 to be inserted into the hole 1 c of the ring-shaped workpiece 1, and the insertion portion 14 is an inner hole 1 c of the ring-shaped workpiece 1. The diameter is set smaller than.

  Further, a large-diameter portion is formed at the distal end portion of the work holding body 14, and the base end of the large-diameter portion is the ring-shaped work 1 when the ring-shaped work 1 is fitted on the work holding body 14. It is comprised in the contact part 14a contact | abutted at the front-end | tip. The abutting portion 14a is set as a reference plane when the ring-shaped workpiece 1 is sandwiched and held together with an abutting portion 15a of the holding cylinder 15 described later.

  Further, a locking projection 14b is provided at the base end portion of the work holding body 14 via a concave groove 14c, and the locking projection 14b is engaged with the holding projection 13a of the claw member 13 that has been pulled in. It is a part to stop.

  Accordingly, the ring-shaped workpiece 1 is sandwiched between the abutting portion 14a (base end having a large diameter) provided near the tip of the workpiece holder 14 and the abutting portion 15a of the holding cylinder 15 so that the workpiece holder 14 This clamping is firmly held by pulling on.

  As shown in FIGS. 1 to 4, the holding cylinder 15 is provided at the distal end portion of the base 11 with a fastening member 18, and the hole 15 b of the holding cylinder 15 has a diameter into which the workpiece holding body 14 can be inserted. When the holding cylinder 15 is attached to the base 11, it is configured to be in communication with the hole 11 a of the base 11.

  The distal end of the holding cylinder 15 is configured as an abutting portion 15 a with which the base end of the ring-shaped workpiece 1 fitted on the workpiece holding body 14 abuts.

  As shown in FIGS. 2 to 4, the opening edge of the hole 11 a provided in the base 11 is a closed portion that guides the claw member 13 in the closing direction by sliding a closing projection 13 b of the claw member 13 described later. Configured as 16.

  As illustrated in FIGS. 2 to 4, the draw bar 12 is configured to be able to be pushed and pulled by a cylinder mechanism (not shown) provided on the base end side.

  Further, a locking protrusion 12b is provided at the tip of the draw bar 12 via a concave groove 12a, and the locking protrusion 12b holds an engagement protrusion 13c provided on a claw member 13 described later. It is a part.

  As shown in FIGS. 2 to 4, four claw members 13 are arranged side by side in the radial direction (annular), and a clogging member 13 b is provided on the front outer peripheral surface of each claw member 13, and the front inner peripheral surface is provided. Is provided with a holding projection 13a, and an engagement projection 13c is provided on the inner peripheral surface of the rear portion.

  Reference numeral 17 denotes an annular urging body that bundles the claw members 13 and urges the front ends of the claw members 13 to open.

  In addition, the base 11 is provided with a centering portion 4 for centering the ring-shaped workpiece 1 before holding the ring-shaped workpiece 1 by the workpiece holding section 2.

  1-4, the centering portion 4 is provided at the distal end portion of the base 11 with a fastening member 19, as shown in FIGS. 1 to 4, and is projected on the surface of the ring-shaped base portion 4b and the base portion 4b. It is comprised with the six support bodies 4a arranged in parallel.

  The inner edge of each support body 4 a arranged in parallel in the radial direction is set to a centering surface that matches the rotational axis of the base 11.

  Moreover, each support body 4a has the metal elasticity which falls inward and outward, and the outer peripheral surface of the ring-shaped work 1 is press-fitted and inserted between these support bodies 4a. The ring-shaped workpiece 1 is press-supported by being arranged in the concave portion 1a formed in (see FIG. 5).

  Accordingly, when the ring-shaped workpiece 1 is pressed and supported inside each of the support bodies 4a, centering based on the outer peripheral surface of the ring-shaped workpiece 1, specifically, the recess 1a (the rotation axis of the base 11). Match).

  The holding | maintenance of the ring-shaped workpiece | work 1 in a present Example which consists of the above structure is demonstrated.

  First, as shown in FIG. 2, the ring-shaped workpiece 1 is press-fitted and inserted into the inner sides of the support bodies 4 a constituting the centering portion 4. At this time, centering is performed on the basis of the outer peripheral surface (recess 1a) of the ring-shaped workpiece 1.

  Subsequently, as shown in FIGS. 3 and 4, when the work holding body 14 is fitted and inserted into the inner hole 1 c of the ring-shaped work 1, and the draw bar 12 is moved by pulling, the claw member 13 is drawn. The closing projection 13b is closed by sliding on the closing portion 16 of the base 11, and the holding projection 13a of the claw member 13 is locked to the locking projection 14b of the workpiece holding body 14, so that the workpiece holding body 14 is Be drawn. By pulling the workpiece holder 14, the front and rear end portions of the ring-shaped workpiece 1 are held in a sandwiched state between the abutting portion 15 a of the holding cylinder 15 and the abutting portion 14 a of the workpiece holder 14.

  Thereafter, the base member 11 is rotated to rotate the ring-shaped workpiece 1, and, for example, a cutting tool is applied to the outer peripheral surface portion 1 b as a processing surface of the rotating ring-shaped workpiece 1 to perform a finish cutting process, and the outer peripheral surface portion 1 b. Is a surface curved in a predetermined direction in the axial direction and the radial direction.

  Note that the reverse operation is performed when releasing the holding of the ring-shaped workpiece 1.

  Since the present embodiment is configured as described above, it has a centering mechanism separately from the work holding mechanism, so that good centering is performed.

  The centering is performed with reference to the accurately formed recess 1a. Furthermore, since the centering has elasticity, the support 4a and the ring-shaped work are reduced as much as possible. 1 is prevented from shifting the axis of the ring-shaped workpiece 1 from the rotational axis of the base 11 as in the conventional example, and thus a good finishing accuracy is always obtained. In the scene where the ring-shaped workpiece 1 can be held and the ring-shaped workpiece 1 is processed when the inner ring 3 is manufactured in the constant velocity joint 10, the inner ring 3 which is a finished product is obtained by finishing cutting. Therefore, it becomes a very effective holding means. Since the cutting process needs to hold the workpiece 1 firmly as compared with the polishing process, if the conventional example is used in the cutting process, the accuracy is reduced accordingly. There is no defect.

  Note that the present invention is not limited to the embodiments, and the specific configuration of each component can be designed as appropriate.

It is a disassembled perspective view of the principal part which concerns on a present Example. It is operation | movement explanatory drawing of a present Example. It is operation | movement explanatory drawing of a present Example. It is operation | movement explanatory drawing of a present Example. It is explanatory sectional drawing of the principal part which concerns on a present Example. 1 is an exploded perspective view of a constant velocity joint 10. FIG. It is a use condition explanatory drawing of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Work 1c Inner hole 3 Inner ring 3a Recessed part 4 Centering part 4a Bearing 6 Drive shaft 7 Outer ring 8 Steel ball 9 Bearing ring 9a Window
10 Constant velocity joint
11 Substrate
14 Insertion part / Work holder
15a Contact part

Claims (9)

  A workpiece holding device for holding a workpiece, wherein a base provided with a workpiece holding portion for holding the workpiece is supported by abutting and supporting a reference surface other than the surface to be processed on the outer peripheral surface of the workpiece. A work holding device, characterized by being provided with a centering part for centering the work.   A workpiece holding device for holding a workpiece, wherein a base provided with a workpiece holding portion for holding the workpiece is made an outer peripheral surface of the workpiece before holding the workpiece by the workpiece holding portion and is not a surface to be processed. A workpiece holding device, wherein a centering portion for centering the workpiece by abutting and supporting the reference surface is provided.   A workpiece holding device for holding a workpiece, wherein the workpiece is pressed into a base provided with a workpiece holding portion for holding the workpiece before the workpiece is held by the workpiece holding portion. A workpiece holding device comprising a centering portion for pressing and supporting the workpiece on a reference surface other than the surface to be processed.   The work holding apparatus according to any one of claims 1 to 3, wherein the centering portion is a plurality of support bodies provided in a projecting manner in an annular shape on the base body.   The work holding apparatus according to claim 1, wherein the support body has expansion / contraction elasticity.   The workpiece holding apparatus according to any one of claims 1 to 5, wherein a ring-shaped workpiece is adopted as the workpiece, and the workpiece holding portion has an insertion portion that is inserted into an inner hole of the workpiece, A workpiece holding device configured to sandwich and hold the front and rear ends of the ring-shaped workpiece.   The workpiece holding apparatus according to any one of claims 1 to 5, wherein a ring-shaped workpiece is adopted as the workpiece, and the workpiece holding portion has an insertion portion that is inserted into an inner hole of the workpiece, A workpiece holding body provided with an abutting portion that comes into contact with the front end of the ring-shaped workpiece, and an abutting portion provided on the base body and in contact with the rear end of the ring-shaped workpiece. The workpiece holding device is configured to hold and hold the ring-shaped workpiece between the two contact portions.   The work holding device according to any one of claims 1 to 7, wherein the work is fitted on the inner ring that fits on the drive shaft, a support ring that fits on the inner ring, and the support ring. Before manufacturing the inner ring in a constant velocity joint having an outer ring and a steel ball disposed between an outer peripheral surface of the inner ring and an inner peripheral surface of the outer ring through a window of the support ring A work holding device characterized by being a stage work.   9. The work holding apparatus according to claim 8, wherein the reference surface other than the surface to be processed which is the outer peripheral surface of the work is a portion which becomes a concave portion provided on the outer periphery of the inner ring in the constant velocity joint. Holding device.

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