JPS6325087Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a workpiece holding device for an internal grinding machine.
More specifically, the present invention relates to an improvement of a work holding device for an internal grindstone that grinds the inner surface of an annular work using a rotationally driven grindstone while holding the outer periphery of the work.

(Prior Art) Conventionally, as a work holding device for this type of internal grinding machine, for example, as shown in FIG. A workpiece W is held in a sandwiched state, and the outer periphery of the workpiece W is moved between a pair of support rollers c and c, each having a rotating shaft parallel to the axis of the workpiece W and pivotally supported between the plates a and b. Similarly, a shoe member d disposed between both plates a and b allows centerless positioning at three points, and the workpiece W is rotated by the rotational drive of the support rollers c and c. Grinding wheel shaft e
By guiding the grinding wheel f attached to the tip of the front plate a into the inner surface of the front plate a through the guide hole g formed in the front plate a and inscribing it on the inner surface of the workpiece W, the inner surface is completely circumferentially covered. It is known that the grinder was used for grinding (for example,
-Refer to Publication No. 49121).

In this case, a push plate h made of cemented carbide and having excellent wear resistance is attached to the part of the front plate a that is in pressure contact with the workpiece W, so that the front plate a can be moved by the rotationally driven workpiece W. Efforts are being made to prevent wear.

However, in the conventional device described above, since the push plate h is attached to the front plate a by shrink fitting, there is a problem in that when the push plate h becomes worn out, it is difficult to replace it. Moreover, in order to ensure a predetermined shrink fit depth, the push plate h has to be thick in the direction of the guide hole g, so the grinding wheel shaft e becomes longer, which increases the amount of deflection of the grinding wheel shaft e. This also has the disadvantage that the machining accuracy of the inner surface of the workpiece W is reduced.

(Purpose of the invention) The purpose of the invention is to provide a workpiece holding device for an internal grinding machine that holds the workpiece in a clamped state by pressing both end surfaces of the workpiece with plates as described above, in which the part of the plate that the workpiece presses against is a thin plate. By forming the grinding wheel in a simple structure using a grinding wheel, it is possible to simplify replacement when worn out, and also to make the grinding wheel shaft shorter and smaller, thereby improving the machining accuracy of the inner surface of the workpiece.

(Structure of the invention) In order to achieve the above object, the solution of the invention is a work holding device for an internal grinder that grinds the inner surface of the work using a rotationally driven grindstone while holding the outer periphery of the annular work. a support roller rotationally driven by a drive device and in contact with the outer periphery of the workpiece to rotate and hold the workpiece at a processing position; a shoe member in contact with the outer periphery of the workpiece and holding the workpiece together with the support roller; A wheel head is supported to move a grindstone in a direction parallel to the rotational axis of the support roller, and the rotational axis of the support roller is parallel to the inner surface of the workpiece supported at the processing position by the support roller and the shoe member. The support member has a receiving surface perpendicular to the workpiece and is provided with a guide hole for allowing the grindstone to reach the inner surface of the workpiece, and is made of a thin plate material having wear resistance. A workpiece holding plate that is clamped and fixed and has a holding surface that can slide into contact with the end face of the workpiece at the processing position and has an insertion hole for allowing the grindstone to reach the inner surface of the workpiece, and a workpiece holding plate that is pressed by a fluid cylinder. , a pressure plate that presses the end face of the workpiece to press the workpiece against the workpiece holding plate during processing.

As a result, the outer periphery of the workpiece is supported by the support roller and the shoe member, and both end surfaces of the workpiece are supported by the holding surface of the workpiece holding plate and the pressure plate, so that the workpiece can be rotated at the processing position. The grindstone is held and rotated by moving the wheel head to guide it inward of the workpiece holding plate through the guide hole and the insertion hole with a length equal to the thickness of the workpiece holding plate, and grinding it against the inner surface of the workpiece. By inscribing the support member and the shoe member, the inner surface is ground over the entire circumference, and by separating the support member and the shoe member, the workpiece holding plate can be attached and detached.

(Effect of the invention) Therefore, according to the invention, the workpiece holding plate is sandwiched and fixed between the support member and the shoe member, and both end surfaces of the workpiece are held between the holding surface of the workpiece holding plate and the pressure plate. Since the workpiece is supported, when the holding surface is worn out by the rotating workpiece, the workpiece holding plate can be easily attached and detached by separating the support member and the shoe member, and the workability of replacing the workpiece can be improved. Moreover, since the support member does not need to ensure a shrink fit depth, it can be made thinner, and since the workpiece holding plate is made of a thin plate material, the grinding wheel shaft from the wheel head to the inner surface of the workpiece can be shortened, and the grinding wheel shaft can be shortened. The amount of deflection can be suppressed as much as possible, and the machining accuracy of the inner surface of the workpiece can be improved.

(Example) Hereinafter, an example as a specific example of the technical means of the present invention will be described based on the drawings.

FIG. 1 shows a workpiece holding device M for an internal grinding machine according to an embodiment of the present invention, B is a base, and S is the base B.
It is a stand installed above. A pair of upper and lower support rollers 1 and 2 are disposed on the left side of the stand S to rotate and hold an annular workpiece W. The upper support roller 1 has its right end supported pivotally on the left end of an arm 3 that is pivotally supported on the base B so as to be able to swing vertically, while the lower support roller 2
is supported on the base B by a rotation axis parallel to the rotation axis of the upper support roller 1, and both support rollers 1 and 2 are rotated at the same speed and in the same direction by a belt drive device (not shown). The workpiece set between both support rollers 1 and 2 when the upper support roller 1 moves to the raised position (the position of the imaginary line in FIG. 1) due to the upward rotation of the arm 3. The upper support roller 1 moves the outer periphery of the workpiece W, which has been supplied to the lowered position P of the W with both end faces facing forward and backward, to the processing position (the position indicated by the solid line in Fig. 1) by the downward rotation of the arm 3. The workpiece W is held in circumferential contact with the lower support roller 2 while being rotated at the processing position P of the workpiece W.

The rear side of the vertically intermediate portion of the stand S (the first
A front plate 4 serving as a support member is attached to the front side of the figure by bolts 5 so that its front surface (receiving surface) 4a is perpendicular to the rotation axis of the support rollers 1 and 2. The left end of the front plate 4 is provided to the rear of the processing position P of the workpiece W, and a guide is provided at the part corresponding to the processing position P so that the grindstone 13 can reach the inner surface of the workpiece W. A hole 6 is formed.

Further, as shown in FIGS. 1 and 2, a show member 7 is held between the stand S and the front plate 4 by tightening bolts 5, and a left end 7a of the show member 7 is held between the stand S and the front plate 4. are provided to protrude toward the processing position P of the workpiece W, and work together with the support rollers 1 and 2 to position and hold the workpiece W at the processing position P at three points without centering. .

The shoe member 7 is provided with a communication hole 8 that communicates the left side end 7a and the right side end 7b,
On the other hand, the stand S is provided with a loading hole 9 whose one end opens on the upper surface of the stand S and whose other end communicates with a midway portion of the communication path 8. Furthermore, at the right end of the communication hole 8, A push rod 10 that reciprocates left and right by a crank mechanism is inserted.
When the support roller 1 is in the raised position, the loading hole 9
The lowest workpiece W loaded with both end faces facing forward and backward is pushed by the push rod 10 moving to the left and sent to the left inside the communication hole 8.
It is configured to be intermittently supplied to the processing position P.

Furthermore, as shown in FIG. 2, a wheel head 12 that is movable in the front and back direction is arranged behind the front plate 4. The wheel head 1
A grindstone shaft 11 is attached to the front end of the grindstone shaft 11, which is provided parallel to the rotation axis of the support rollers 1 and 2 and rotates, and a cylindrical grindstone 13 is attached to the front end of the grindstone shaft 11. The above wheel head 12
By moving forward, the rotatably driven grindstone 13 is guided inward through the guide hole 6 of the front plate 4, and the inner surface of the workpiece W supported at the processing position P by the support rollers 1 and 2 and the shoe member 7 is The inner surface is ground by being inscribed in the inner surface.

As shown in FIG. 2, a work holding plate 14 made of a wear-resistant thin plate material is sandwiched and fixed between the front plate 4 and the shoe member 7. A holding surface 14a is formed at the left end of the workpiece holding plate 14 to cover a portion of the front plate receiving surface 4a corresponding to the processing position of the workpiece W, so as to come into sliding contact with the rear end surface of the workpiece W at the processing position P. is being done. In addition, the above-mentioned holding surface 1
An insertion hole 15 is formed in 4a so as to correspond to the guide hole 6 of the front plate 4 so that the grindstone 13 guided inward from the guide hole 6 reaches the inner surface of the workpiece W.

Further, in front of the processing position P of the workpiece W, a pressure plate 16 for pressing the workpiece W against the workpiece holding plate 14 is disposed. The pressure plate 16 is fitted into a cylindrical fluid cylinder 17, and the space within the fluid cylinder 17 is divided by the pressure plate 16 into two front and rear hydraulic chambers 18a and 18b. When the workpiece W is supplied to the processing position P by the push rod 10, the pressure plate 16, which moves rearward as oil is supplied to the front hydraulic chamber 18a, presses the front end surface of the workpiece W rearward. W
until the grinding of the inner surface is completed.
It is configured to be pressed and held against the holding surface 14a of.

Therefore, the processing position P is set by the push rod 10.
The work W supplied to the pressure plate 16
The workpiece is pressed against the holding surface 14a of the workpiece holding plate 14 by the pressure of the workpiece holding plate 14, and is positioned and held at three points without centering by the upper support roller 1, the lower support roller 2, and the shoe member 7, which have moved to the lowered position. , rotationally driven. Next, by moving the wheel head 12 forward, the front plate 4
guide hole 6 and insertion hole 1 of workpiece holding plate 14
The inner surface of the workpiece W is ground over the entire circumference by the grindstone 13 guided inward through the grindstone 5, and after the grinding is completed, the grindstone 13 is taken out from the inner surface of the workpiece W by moving the wheel head 12 backward. The workpiece W after grinding is released from the centerless support state by the movement of the upper support roller 1 to the raised position, and is sent to the left from the processing position P by the rotation of the lower support roller 2. It falls onto the chute 19 placed on the left and is collected.

Therefore, in the above embodiment, a wear-resistant workpiece holding plate 14 is sandwiched and fixed between the front plate 4 and the shoe member 7, and the rotating workpiece W is attached to a part of the workpiece holding plate 14. Since the holding surface 14a is formed to be in sliding contact with the rear end surface, when the holding surface 14a is worn out due to sliding contact with the workpiece W, the bolts 5 are loosened, the front plate 4 and the shoe member 7 are separated, and the workpiece holding plate 14 is removed. By removing it, you can easily replace it with a new one.
It is possible to improve the efficiency of replacement work by eliminating the need for complicated work such as conventional shrink fitting.

In addition, since the front plate 4 does not need to ensure a shrink fit depth as in the past, it can be made thinner, and the work holding plate 14 is made of a thin plate material, so
The length of the guide hole 6 and the insertion hole 15 can be shortened,
This allows the work W to be moved from the wheel head 12.
The grinding wheel shaft 11 reaching the inner surface of the wheel can be made as short as possible,
As a result, the amount of deflection of the grindstone shaft 11 can be suppressed, and the accuracy of machining the inner surface of the workpiece W can be improved.

[Brief explanation of drawings]

FIG. 1 is a front view of a work holding device for an internal grinder according to the present invention, FIG. 2 is a sectional view taken along the line -- in FIG. 1, and FIG. 3 is a sectional view of a main part of a conventional example. 1...Support roller, 2...Support roller, 4...
Front plate, 4a... Receiving surface, P... Machining position, 6... Guide hole, 7... Show member, 12...
...wheel head, 13...grindstone, 14...work holding plate, 14a...holding surface, 15...insertion hole,
16...pressure plate, 17...fluid cylinder.

Claims (1)

[Scope of utility model registration request] A workpiece holding device for an internal grinder that grinds the inner surface of an annular workpiece using a rotationally driven grindstone while holding the outer circumference of the workpiece. A support roller that rotates and holds the workpiece at a position, a show member that contacts the outer periphery of the workpiece and holds the workpiece together with the support roller, and a support roller that is supported on the inner surface of the workpiece that is supported at the processing position by the support roller and the show member. A wheel head supported so as to move the grindstone in a direction parallel to the rotational axis of the roller, and a bearing surface perpendicular to the rotational axis of the support roller, and allows the grindstone to reach the inner surface of the workpiece. It is composed of a support member provided with a guide hole for processing and a wear-resistant thin plate material, and is sandwiched and fixed between the support member and the shoe member, and can slide into contact with the end surface of the workpiece at the processing position. A workpiece holding plate has a holding surface and an insertion hole for allowing the grindstone to reach the inner surface of the workpiece, and is pressed by a fluid cylinder to press the end face of the workpiece and press the workpiece against the workpiece holding plate during processing. A workpiece holding device for an internal grinding machine, which is equipped with a pressure plate.