JP4924064B2 - Work holding mechanism and contour grinding apparatus in contour grinding apparatus - Google Patents

Description

  The present invention relates to a work holding mechanism and an external grinding apparatus in an external grinding apparatus that drives a work end face.

  Conventional grinding methods include surface grinding, cylindrical grinding to grind the outer peripheral surface of the cylinder, and internal grinding to grind the inner circumferential surface of the cylinder. There is also a centerless grinding method in which the axis of the workpiece is brought out by the receiving plate.

For example, there is a coreless grinding apparatus as disclosed in Patent Document 1 for performing the coreless grinding method.
This grinding apparatus includes a centerless grinding blade, a rotating grindstone provided above the support slope, and an adjustment wheel provided on the support slope and capable of entering the groove.
Further, a supply mechanism is provided on the side of the grinding blade to supply the object to be ground to the support slope, and this supply mechanism is in a state where at least a part of the object to be ground has reached the support slope. A pair of holding means for holding the posture of the object to be ground from the front-rear direction is provided.
Further, the supply mechanism includes a push bar that slides between a pair of holding means and pushes the object to be ground to a support slope, and one of the pair of holding means is a pusher that can slide back and forth, and the pusher In cooperation with the other of the pair of holding means, it is possible to move between a holding position for holding the object to be ground and a standby position for receiving the object to be ground waiting for the next supply.
With such a configuration, a core having a non-circular flange can be manufactured, and a coreless grinding blade or the like that can prevent the core material from flipping can be provided.

JP 2006-272487 A

On the other hand, as shown in FIG. 8, the centerless grinding apparatus 1 has a means of using a work W end face and fixing a drive plate 2 for rotating the work W to the rotary spindle 3.
That is, in the centerless grinding apparatus 1, the drive plate 2 fixed to the rotation spindle 3 that receives the rotational force from the drive unit of the apparatus main body, and the core pusher that is disposed opposite to the drive plate 2 and pressed against the drive plate 2. The work W is provided between the drive plate 2 and the core pressing means 4, and the work W is rotatably supported by a work holding jig 5 from the side surface of the work W.
In this case, the workpiece W is configured to receive power from the drive plate 2 in a state where the tip end side of the drive plate 2 is in contact with the end surface of the workpiece W.

Therefore, in such a technique, if the machining state of the workpiece W end surface is moderate, the workpiece behavior becomes unstable and the machining accuracy of the workpiece W is adversely affected. Therefore, the workpiece end surface must be finished in advance. There was a problem.
The present invention has been proposed from such a background, and it does not adversely affect the external grinding without having to finish the workpiece end face in advance, An object is to provide an external grinding device.

In order to solve the above problems, the invention according to claim 1 is configured such that the workpiece (W) is sandwiched between the drive unit (12) of the apparatus main body (11) and the workpiece (W) is clamped to transmit the rotational force. holding mechanism Oite which definitive the contour grinding device (10) subjected to grinding against, the holding mechanism,
In order to transmit the rotational force from the drive unit (12) of the apparatus main body (11) to the work (W), it is pressed against the end face of the work (W) so as to be able to follow and rotates through the end face of the work (W). a power transduction means (13) for transmitting the force, and disposed facing the backing plate (14a), the workpiece (W) Te via one end face, pressed against the backing plate (14a) and drive plate (15) A core pressing means (17) and a work holding jig (18) for rotatably holding the work (W) from the side surface of the work (W), and
The power transmission means (13) includes a cylindrical shaft-shaped backing plate (14a) projecting coaxially with the rotation center axis (X) of the main shaft (14) that receives the rotational force from the drive section (12), and the backing plate. And a drive plate (15) loosely fitted with the shaft as an axis, and a resilient support means (16) for resiliently supporting the drive plate with respect to the main shaft (14). With the backing plate (14a) as an axial center with respect to the main shaft (14), the guide post (22) and the elastic support means (16) are used for elastic support .
With such a configuration, even if the workpiece (W) end surface is distorted with respect to the rotation axis, the power transmission means (13) follows the workpiece (W) end surface while rotating while transmitting the rotational force. And a rotational force can be transmitted to a workpiece | work (W) via a workpiece | work (W) end surface.
In addition , when the workpiece (W) is sandwiched and the workpiece (W) receives a rotational force by the drive unit (12), the drive plate (14a) is interposed through the backing plate (14a) in response to the distortion of the workpiece (W) end surface. 15), the elastic support means (16) displaces the backing plate (14a) as the axis, and can apply a predetermined rotational force to the workpiece (W) without shaft wobbling.
Furthermore , even if the workpiece (W) end face is not finished, the backing plate (14a) and the drive plate (15) that is displaced by the elastic support means (16) together with the guide post (22), The rotational force can be transmitted to the workpiece (W) without any trouble.

  In addition, the code | symbol in the parenthesis attached | subjected to each said component and each following described component is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

According to the second aspect of the present invention, the drive plate (15) has a plurality of guide posts (22) arranged at appropriate intervals in a concentric manner along the vicinity of the outer peripheral edge portion. 22), a plurality of elastic support means (16) are arranged on a concentric circle formed with guide posts (22).
As a result, the drive plate (15) can follow and abut on the end surface of the workpiece (W) in a state where it floats from the main shaft (14) by the elastic support means (16) together with the guide post (22).

In the invention according to claim 3 , the workpiece (W) is a solid type, has a large diameter portion (Rl) and a small diameter portion (Rs), and is provided on the end surface on the large diameter portion (Rl) side. Includes a contact portion (Rp) that protrudes coaxially to the workpiece (W) central axis (O), and when the workpiece (W) is sandwiched between the core pressing means (17) and the backing plate (14a), The contact portion (Rp) on the end face on the large diameter portion (Rl) side is in contact with the backing plate (14a).
Thereby, a workpiece | work (W) can be clamped according to a rotation center axis | shaft.

FIG. 1 shows a workpiece holding mechanism 20 in an external grinding apparatus 10 according to the present invention. In addition, although the detailed drawing is abbreviate | omitted here, the external shape grinding apparatus 10 clamps the workpiece | work W so that rotational force may be transmitted from the drive part 12 of the apparatus main body 11, and it grinds with respect to the workpiece | work W (coreless grinding). ).
That is, in order to transmit the rotational force from the drive unit 12 of the apparatus main body 11 to the workpiece W, the workpiece holding mechanism 20 presses the workpiece W end surface so as to be able to follow, and transmits the rotational force via the workpiece W end surface. and it includes a power transmission us means 13.

Power transduction means 13, the drive plate loosely fitted a cylindrical shaft-like backing plate 14a which coaxially projecting from the rotation center axis X of the main shaft 14 for receiving the rotating force, the backing plate 14a as the axis by the driving unit 12 15 and a resilient support means 16 for resiliently supporting the drive plate 15 with respect to the main shaft 14 with the backing plate 14a as an axis.

Further, the work holding mechanism 20 is provided with a core pressing means 17 that opposes the backing plate 14a and presses the work W against the backing plate 14a and the drive plate 15 through one end face of the work W.
Further, the workpiece holding mechanism 20 is provided with a workpiece holding jig 18 that rotatably supports the workpiece W from the side surface of the workpiece W.

In the power transmission means 13, the drive unit 12 is rotatably attached to the apparatus main body 11 via a bearing 21.
The main shaft 14 and the drive unit 12 are configured to be rotatable about the X axis as a center of rotation. Further, a backing plate 14 a is coaxially fixed to the main shaft 14 and penetrates the center of the main shaft 14. The rotation center is configured to be rotatable.
A disc-shaped drive plate 15 is loosely fitted in the center of the backing plate 14a so as to be rotatable about the backing plate 14a. In this case, the drive plate 15 is formed with an insertion hole 19 in the center of the boss 15B protruding in the thickness direction in which the backing plate 14a can be loosely fitted. The boss portion 15B is provided with a protruding edge portion 15E that protrudes in the X-axis direction.

As shown in FIG. 2, the drive plate 15 as described above has guide posts 22 arranged every 120 degrees concentrically along the vicinity of the outer peripheral edge.
Further, the drive plate 15 is provided with a plurality of elastic support means 16 between the guide posts 22 on a concentric circle in which the guide posts 22 are formed.

  The elastic support means 16 has a spring having a predetermined spring constant k in a spring hole 23 continuously formed in both the main shaft 14 and the drive plate 15 so as to coincide with the formation position in the axial direction parallel to the X axis. 24 is interposed.

The core pressing means 17 in the work holding mechanism 20 is placed on the backing plate 14a on the main shaft 14 by a case 25 and a spring 26, which are arranged in alignment with the X axis that is the center of rotation of the main shaft 14 of the drive unit 12. It is comprised with the pressing member 27 which protrudes toward.
The spring 26 has a larger spring constant k than the spring 24 constituting the elastic support means 16.

  Further, the work holding jig 18 in the work holding mechanism 20 is bolted to the apparatus main body 11 located on the outer peripheral side of the main shaft 14 of the drive unit 12. In this case, the workpiece holding jig 18 projects a receiving portion 18a having a concave surface that comes into contact with the outer peripheral side surface of the workpiece W sandwiched between the core pressing means 17 and the backing plate 14a.

  In the workpiece holding mechanism 20 in the external grinding apparatus 10 shown in FIG. 1, a processing tool such as a grinding wheel for grinding the workpiece W is omitted.

Next, the workpiece | work W hold | maintained with the workpiece | work holding | maintenance mechanism 20 in this external shape grinding apparatus 10 concerning this invention is demonstrated roughly.
That is, the workpiece holding mechanism 20 can process the solid type workpiece W shown in FIGS. 3 to 5 and the hollow type (cylindrical type) workpiece W shown in FIG.

First, as shown in FIGS. 3 to 5, the solid-type workpiece W has, for example, a large diameter portion Rl and a small diameter portion Rs. Among these, in the type of FIG. 4, the large diameter portion Rl is chamfered, and in the type of FIG. 5, the small diameter portion Rs is chamfered.
Further, when the work W is sandwiched between the core pressing means 17 and the backing plate 14a, the abutting portion Rp that protrudes conically around the central axis O and contacts the backing plate 14a is provided on the end surface on the large diameter portion Rl side. Is forming.

  On the other hand, the hollow type (cylindrical type) workpiece W shown in FIG. 6 has a predetermined thickness t and a cylindrical hole H having a predetermined inner diameter d. The workpiece W is clamped by a workpiece holding mechanism 20 described later. Like to do.

The workpiece holding mechanism 20 in the external grinding apparatus 10 according to the present invention is configured as described above, and the operation and action of the workpiece holding mechanism 20 will be schematically described.
In the workpiece holding mechanism 20 in the external grinding apparatus 10, the drive plate 15 is loosely fitted on the backing plate 14 a of the main shaft 14, and the drive plate 15 is floated by the plurality of guide posts 22 and the plurality of elastic support means 16. It is supported by.

Here, in order to set the workpiece W in the workpiece holding mechanism 20, first, the small diameter of the workpiece W in a state where the receiving portion 18 a of the workpiece holding jig 18 is applied to the outer peripheral side surface of the small diameter portion Rs of the workpiece W. The end surface on the portion Rs side is clamped by the core pressing means 17 and the end surface on the large diameter portion Rl side is clamped toward the backing plate 14a.
At this time, on the end surface on the large diameter portion Rl side of the workpiece W, the abutting portion Rp abuts against the backing plate 14a, and the protruding edge of the boss portion 15B at the center of the drive plate 15 located so as to surround the backing plate 14a. The portion 15E comes into contact with the outer end surface of the contact portion Rp.
In this way, the workpiece W can hold the workpiece W on the workpiece holding mechanism 20 in a state where the center axis O substantially coincides with the X axis passing through the workpiece holding mechanism 20.

  Next, when the driving unit 12 is driven to be ground by the external grinding device 10 and the main shaft 14 is rotated, the drive plate 15 can rotate in conjunction with the guide post 22, and the core pressing means 17 and the backing are backed up. The workpiece W sandwiched between the plates 14a can be rotated.

By the way, when the workpiece W is rotated, the drive plate 15 that rotates together with the workpiece W is in a state in which the protruding edge portion 15E of the central boss portion 15B is in contact with the outer end surface of the contact portion Rp on the large diameter portion Rl side. If the end surface outside the contact portion Rp on the workpiece W large-diameter portion Rl side is in a poorly processed state and has not been finished, the drive plate 15 has the projecting edge portion 15E of the central boss portion 15B. It is influenced by the processing state of the end face outside the abutting portion Rp of W.
However, since the drive plate 15 is loosely fitted to the main shaft 14 on the backing plate 14a of the main shaft 14, and is supported in a floating state by the plurality of guide posts 22 and the plurality of elastic support means 16, the drive plate 15 15 can follow and displace according to the machining state of the end surface outside the contact portion Rp of the workpiece W, and can absorb the influence of the machining state of the end surface outside the contact portion Rp of the workpiece W.
For this reason, only the rotational force is transmitted to the workpiece W, and the workpiece W is held in a state where the drive plate 15 substantially coincides with the central axis O and the X axis of the workpiece holding mechanism 20. It can be rotated without shaking.

  In this manner, the workpiece W is held between the backing plate 14a and the core pressing member 17 in a state where the receiving portion 18a of the workpiece holding jig 18 is applied, so that the workpiece W is held and is most affected by the state of the workpiece end surface. The drive plate 15 is lifted from the main shaft 14, and only the rotational force is transmitted, so that the workpiece W can be stably rotated, so that the external grinding can be accurately performed without finishing the workpiece W end face in advance. become.

  The workpiece holding mechanism 20 in the external grinding apparatus 10 according to the present invention can be clamped by the workpiece holding mechanism 20 to perform the outer surface grinding process on the hollow type workpiece W shown in FIG. 6 as follows. it can. When the hollow type workpiece W is clamped, it can be clamped without using the core pushing member 17.

Therefore, the workpiece holding mechanism 20 in this case will be described. Note that components that are substantially the same as those of the workpiece holding mechanism 20 described above are denoted by the same reference numerals, and detailed description thereof is omitted.
That is, as shown in FIG. 7, in this work holding mechanism 20, a drive plate 15 is attached to a plurality of guide posts with respect to a main shaft 14 that receives a rotational force by a drive unit (not shown) in order to hold both end faces of the work W. The backing plate 14a is provided coaxially with the main shaft 14 so as to be opposed to the drive plate 15 and supported by the elastic support means 22 and the elastic support means 16.

The drive plate 15 and the backing plate 14a are provided with projecting edge portions 15E and 14E that are in contact with both end surfaces of the workpiece W to be sandwiched, on the sides facing each other.
The both end surfaces of the workpiece W are sandwiched between the drive plate 15 and the backing plate 14a via the projecting edge portions 15E and 14E. At this time, the receiving portion 18a of the workpiece holding jig 18 is in contact with the outer peripheral side surface of the workpiece W.

Further, at both end faces of the hollow type workpiece W, one end face may be finished and the other end face may not be finished.
And when pinching such a workpiece | work W, the projecting edge part 14E of the backing plate 14a is contact | abutted to the end surface side to which the finishing process was given, and the projecting edge of the drive plate 15 to the end surface side to which the finishing process has not been given The part 15E is brought into contact.

  When the hollow type workpiece W sandwiched as described above is rotated, the drive plate 15 that comes into contact with the end surface that has not been subjected to the finishing process is driven by the distortion of the end surface that has not been subjected to the finishing process. However, the drive plate 15 is lifted from the main shaft 14 and can transmit the rotational force only, so that the workpiece W can be stably rotated, so that both end faces of the workpiece W need not be finished in advance. This makes it possible to perform external grinding with high accuracy.

It is principal part cross-sectional explanatory drawing which shows an example of the workpiece holding mechanism in the external shape grinding apparatus concerning this invention. It is a plane explanatory view of the drive plate in the work holding mechanism shown in FIG. It is a side view which shows an example of the workpiece | work hold | maintained by the workpiece holding mechanism in the external shape grinding apparatus concerning this invention. It is a side view which shows another example of the workpiece | work hold | maintained by the workpiece holding mechanism in the external grinding apparatus concerning this invention. It is a side view which shows another example of the workpiece | work hold | maintained by the workpiece holding mechanism in the external grinding apparatus concerning this invention. It is a side view which shows another example of the workpiece | work hold | maintained by the workpiece holding mechanism in the external grinding apparatus concerning this invention. It is principal part sectional explanatory drawing which shows another example of the workpiece | work holding | maintenance mechanism in the external shape grinding apparatus concerning this invention. It is a typical mechanism block diagram which shows an example using the workpiece | work holding | maintenance mechanism in the conventional external shape grinding apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 External grinding apparatus 11 Apparatus main body 12 Drive part 13 Power transmission means 14 Main shaft 14a Backing plate 15 Drive plate 15B Boss part 15E Edge part 16 Ejection support means 17 Core pushing means 18 Work holding jig 19 Insertion hole 20 Work holding mechanism 21 Bearing 22 Guide post 23 Spring hole 24 Spring 25 Case 26 Spring 27 Press member W Work H Cylindrical hole

Claims (3)

And clamping the workpiece (W) so as to transmit the rotational force from the driving unit of the apparatus main body (11) (12), the workpiece (W) with respect to performing grinding profile grinding device (10) to the definitive retention mechanism (20) Leave
The workpiece holding mechanism (20)
In order to transmit the rotational force from the drive unit (12) of the apparatus main body (11) to the work (W), it is pressed against the end face of the work (W) so as to be able to follow and rotates through the end face of the work (W). and power transduction means for transmitting the force (13),
A core pressing means (17) disposed opposite the backing plate (14a) and pressing the workpiece (W) against the backing plate (14a) and the drive plate (15) through one end surface;
A workpiece holding jig (18) that rotatably holds the workpiece (W) from the side surface of the workpiece (W), and
The power transmission means (13)
A cylindrical shaft-shaped backing plate (14a) projecting coaxially to the rotation center axis (X) of the main shaft (14) that receives rotational force from the drive unit (12);
The drive plate (15) loosely fitted around the backing plate (14a) as an axis;
A resilient support means (16) for resiliently supporting the drive plate (15) with respect to the main shaft (14);
The drive plate (15) is configured to be elastically supported by the elastic support means (16) together with the guide post (22), with the backing plate (14a) being an axial center with respect to the main shaft (14). A workpiece holding mechanism in an external grinding apparatus. Said drive plate (15) is concentrically along the vicinity of the outer peripheral portion, by arranging for each appropriate intervals plurality of said guide post (22), between the guide posts (22), said guide post ( The work holding mechanism in the external grinding apparatus according to claim 1, wherein a plurality of the elastic support means (16) are arranged on a concentric circle forming 22). The workpiece (W) is a solid type, has a large diameter portion (Rl) and a small diameter portion (Rs), and the workpiece (W) central axis (O) is on the end surface on the large diameter portion (Rl) side. the abutment coaxially to project with the (Rp), when clamping the workpiece (W) between the said core Oshide stage (17) backing plate (14a), said large diameter portion (Rl) side The workpiece holding mechanism in the external grinding apparatus according to claim 1 or 2 , wherein a contact portion (Rp) of the end surface is in contact with the backing plate (14a).

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