JPH0451960Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is a grinding machine that supports and rotates a workpiece with two rollers to grind the workpiece, for example, grind the inner peripheral surface of the workpiece. The present invention relates to a work supporting device.

(Prior Art) A so-called one-shoe two-roller type grinding machine has been known, for example, as disclosed in Japanese Utility Model Application Publication No. 59-97839.

Such a grinding machine, for example, as shown in FIG. 5, supports a workpiece 4 with two rotatable rollers 1 and 2 and one shoe 3, and drives one or both of the rollers 1 and 2 to rotate. The workpiece 4 is rotated, and a grindstone (not shown) is inserted into the hole 4a of the workpiece from the front side in the direction perpendicular to the paper surface of FIG.
The inner circumferential surface of a is ground.

In such a one-shoe, two-roller type grinding machine, for example, the workpiece 4 consists of large diameter portions 4b, 4c at both left and right ends and a small diameter portion 4d in the middle, as shown in FIG. When a hole 4a to be ground is formed in the end face of 4c, as shown in FIG. 7, large-diameter flange parts 1a, 1b,
A structure is adopted in which rollers 1 and 2 having rollers 2a and 2b are used, and a workpiece 4 is supported at two points each, a total of four points, by their flange portions 1a, 1b, 2a, and 2b.

(Problem that the invention attempts to solve) However, in this way, the pair of upper and lower rollers 1,
2 to support workpiece 4 at two points each,
As shown in Fig. 8, all the flanges of both rollers 1 and 2 cannot be brought into complete contact with the outer peripheral surface of the workpiece 4, resulting in uneven contact, resulting in a gap 5 between the workpiece and the rollers. , as a result, workpiece 4 during grinding.
There is a problem in that the movement of the hole 4a causes an adverse effect on the machining accuracy, such as the hole 4a becoming tapered.

That is, the work 4 is usually placed on the lower roller 2 positioned at a predetermined position, and the upper roller 1, which can move forward and backward with respect to the work 4, is moved in the direction of the work 4 by its own weight, and the work 4 is It is configured to press and hold the workpiece, and it is difficult to perfectly match the parallelism between the outer shape of both large diameter parts 4b and 4c of the workpiece and the distance between the flange parts of both rollers 1 and 2. If the parallelism of both rollers to the workpiece does not match completely, place the workpiece 4 on the lower roller 2 and lower the upper roller 1 onto the workpiece 4 so that it comes into contact with the workpiece 4.
As shown in the figure, the upper roller 1 is in a state of uneven contact, and as a result, the above-mentioned problem occurs.

In view of the above-mentioned circumstances, the object of the present invention is to provide a workpiece support device for a grinding machine in which a pair of rollers each support a workpiece at two points, and which supports the workpiece without the risk of uneven contact of the rollers with the workpiece as described above. The goal is to provide equipment.

(Means for Solving the Problems) In order to achieve the above object, the workpiece support device for a grinding machine according to the present invention includes a first roller that is rotatably attached to the base and supports the workpiece at two points. , a second roller rotatably attached to a movable table at a position facing the first roller and supporting the workpiece at two points, the movable table includes a second roller attached to the table; In the workpiece support device for a grinding machine, the movable table is divided into a base and a mounting part for the second roller, and the mounting part for the second roller is , the second roller is attached to the base so as to be swingable in a plane including the rotation axis of the second roller and the support portion of the workpiece on the second roller.

In the above-mentioned movable table, "the second roller is movable in the direction of moving forward and backward toward the first roller" means
In addition to the case where the movable direction of the movable base is the same as the direction in which the second roller is moved forward and backward toward the first roller, it also includes the case where the movable direction has a component in the direction in which the second roller is moved forward and backward toward the first roller.

The phrase "oscillation is possible within a plane that includes the rotation axis of the second roller and the supporting part of the workpiece on the second roller" in the attachment part of the second roller means:
This is meant to include cases in which the attachment portion can swing completely within the plane, as well as cases in which it has a swing component within the plane. Note that the above-mentioned swinging within the plane means swinging around an axis in a direction perpendicular to the plane.

(Function) As described above, the mounting portion of the second roller is configured to be able to swing within a plane that includes the rotation axis of the second roller and the support portion of the workpiece on the second roller. The second roller can also swing within the above-mentioned plane via the attachment portion of the second roller. If it is possible to swing within the above plane, even if the second roller makes partial contact with the workpiece as described above, the second roller swings within the above plane and thereby The uneven contact is eliminated, and the second roller can be supported in contact with the workpiece at two points.

(Effect of the invention) As described above, in the work supporting device for a grinding machine according to the present invention, the movable base is divided into a base and a second roller mounting part, and the second roller mounting part is connected to the rotation axis of the second roller. The second roller is attached to the base so as to be able to swing in a plane including the supporting part of the workpiece, so that the distance between the first and second rollers and the parallelism with the workpiece are completely equal. Even when the workpiece is not aligned, the second roller can swing appropriately to prevent uneven contact between the second roller and the workpiece, and both rollers can always support the workpiece at two points each. .

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a plan view of a grinding machine equipped with a workpiece support device according to the present invention, and FIG. 2 is a front view of the grinding machine shown in FIG. 1.

As shown in the figure, a first roller 12 is rotatably mounted on a base 10, and a second roller 12 is also mounted on a movable base 14.
A roller 16 is rotatably mounted at a position facing the first roller 12. The movable base 14 rotates in the direction of arrow A around a rotation center axis 14a so that the second roller 16 attached to the base 14 can be moved forward and backward toward the first roller 12. It is configured to be movable.

There is space between the rollers 12 and 16 as shown in FIG. 3, which is a detailed view of the main part of the work supporting device in FIG. 2, and FIG. 4, which is a left side view of the work supporting device in FIG. , the workpiece 18 is held between them. This work 18 is
2, 16 and one shoe 20. In addition, this work 18 has large diameter portions 18a, 18 at both left and right ends, as indicated by diagonal lines in FIG.
It has a shape similar to that shown in FIG. 6, consisting of a small diameter portion 18c and a small diameter portion 18c, and a hole 18d to be cut is formed in the end face of the large diameter portion.

Both rollers 12, 16 have large diameter flange portions 12a, 12b, 16a, 16b at both left and right ends, as shown in detail in FIG. 1
2b and 16a, 16b support the work 18 at two points, respectively, at its large diameter portions 18a, 18b.

The movable table 14 is divided into a base portion 14b on the rotation center shaft 14a side and a second roller attachment portion 14c to which the second roller 16 is attached.
The roller mounting portion 14c is rotatable around the rotation center axis 14a integrally with the base portion 14b, and is a flat surface that includes the rotation shaft 16c of the second roller and the support portion of the work 18 on the second roller 16. It is attached to the base 14b via a connecting shaft 22 so as to be able to swing within the plane (within a plane perpendicular to the plane of the paper including the dashed line B in FIGS. 2 and 3).

The connecting shaft 22 is fixed to the base 14b, and the second roller attachment part 14c is rotatably supported by the connecting shaft 22 fixed to the base 14b. Further, this connecting shaft 22 is provided at a position where its shaft center 22 a passes through the center of the second roller 16 . In other words, in this embodiment, the second roller mounting portion 14
c is configured to be rotatable, that is, swingable, in a plane perpendicular to the plane of the paper that includes the dashed-dotted line C in FIG. However, since the oscillation in the plane perpendicular to the plane of paper including the dashed-dotted line C has a oscillation component in the plane perpendicular to the plane of the paper including the dashed-dotted line B, this example Also, the second roller mounting portion 14c is swingable within a plane perpendicular to the plane of the paper including the dashed-dotted line B, that is, a plane including the rotation axis 16c of the second roller and the supporting portion of the work 18 on the second roller 16. It is configured.

A pin 24 is provided on the base portion 14b to protrude toward a second roller attachment portion 14c, and a groove 26 is formed in the second roller attachment portion 14c facing the pin 24. 26, the second roller mounting portion 14c is configured to allow rocking relative to the base portion 14b only within a predetermined range.

Next, the grinding of a workpiece using the illustrated apparatus will be explained.

First, the work 18 is dropped from the work supply hole 32 of the work supply section 30, and the work 18 is positioned on the shoe 20 as shown in FIG. Subsequently, the workpiece pusher 3 is loaded by the loading cylinder 34.
6 toward the left in the direction of arrow D, and the forward movement of the workpiece pusher 36 pushes the workpiece 18 on the shoe 20 towards both rollers 12 and 16,
The workpiece is sent to the position of the workpiece 18' in FIG.
When the workpiece 18' is further pushed to the left side in the figure by the pusher 36 from the position shown in FIG. Since it is rotatable in the direction A and is biased downward in the direction of arrow A by its own weight, the second roller 1
6 is rotated upward in the direction of arrow A by the workpiece 18', and accordingly the workpiece 18' is further pushed to the left side in the figure, pushing out the workpiece 18 that has already been ground to the left side in the figure. The second roller 16 moves downward in the direction of arrow A due to its own weight, and the workpiece 18'
is pressed toward the first roller 12 and shoe 20 and supported.

In this state, if the distances between the workpiece 18' and the first and second rollers are not parallel to each other as shown in FIG. Even if
The second roller 16 is rotatable in the direction of the arrow E in FIG. 4 within a plane perpendicular to the plane of the paper that includes the dashed line C in FIG. , the second roller 16 is rotated by the weight of the base 14b of the movable base in a direction in which both flanges 16a, 16b abut and support the workpiece 18', so that the workpiece 18' is always supported by the first roller 12. and a second roller 16, each of which is supported at two points.

After the workpiece 18' is positioned at the position of the workpiece 18 in FIG. Rotate in the direction of arrow F in Fig. 3,
Thereby, the workpiece 18' is rotated in the direction of arrow G. Note that the first roller 12 is merely rotatably attached to the base and is not particularly rotationally driven, but is rotated in the direction of arrow H as the workpiece 18' rotates. .

While rotating the workpiece 18' in this manner, the grindstone 42 shown in FIG. 1 is advanced in the direction of arrow I and inserted into the hole 18' to be ground. Perform internal grinding.

When the grinding is finished, the grinding wheel 42 is moved backward, and the work pusher 36 positions the next workpiece to be ground between the rollers 12 and 16 in the manner described above, and the ground workpiece pushed out by the new workpiece. is stored in the container 46 through the guide 44.

Note that the movable base 14 is a clamp cylinder 4.
8, it is configured to be movable in the direction of arrow J. With this configuration, the second roller 16 can be appropriately moved in the direction of arrow J, and even if the diameter of the workpiece to be ground changes, the workpiece and both rolls are always kept in contact with each other. It is now possible to obtain the optimal positional relationship between

As mentioned above, in the above embodiment, the base 14b
Since the second roller 16 is configured to be rotatable about the connecting shaft 22, the second roller 16 can swing within a plane that includes the rotating shaft 16c and the workpiece 18 supported between the rollers 12 and 16. Due to the swinging motion, the second roller 16 always contacts the workpiece 18 at two points, and the workpiece 18 can be supported reliably, thereby improving grinding accuracy.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a grinding machine equipped with an embodiment of the work supporting device according to the present invention, FIG. 2 is a front view of the grinding machine shown in FIG. 1, and FIG. 3 is the work supporting device shown in FIG. 2. FIG. 4 is a left side view of the main parts of the workpiece support device in FIG. 3, FIG. Figure 6 is a perspective view showing an example of the workpiece, Figure 7 is a diagram showing the workpiece being supported at two points by two rollers, and Figure 8 is one of the rollers in partial contact with the workpiece. It is a figure showing a state. 10... Base, 12... First roller, 14...
Movable base, 14b...Base, 14c...Second roller attachment part, 16...Second roller, 18, 18'...
work.

Claims (1)

[Claims for Utility Model Registration] A first roller rotatably attached to a base and supporting a workpiece at two points; a first roller rotatably attached to a movable table at a position opposite to the first roller; The second part supports the workpiece at two points.
a workpiece support device for a grinding machine, wherein the movable base is movable in a direction in which the second roller attached to the base moves forward and backward toward the first roller; and a second roller mounting part, and the second roller mounting part is capable of swinging in a plane that includes the rotation axis of the second roller and the supporting part of the workpiece on the second roller. A workpiece support device for a grinding machine, characterized in that it is attached to the base.