JPH0354838Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of a workpiece support device for an internal grinder.

(Prior art and its problems) Conventionally, a work support device for an internal grinding machine that grinds the inner peripheral surface of an annular workpiece includes a lower roller rotatably supported on a base and supporting the lower part of the workpiece;
A shoe member is fixed to the base and supports the side of the workpiece, and an upper roller is rotatably supported by an arm member attached to the base so as to be movable up and down and supports the upper part of the workpiece under pressure. So-called 2
A roller one-show type has been proposed (see Japanese Utility Model Publication No. 14029/1983).

On the other hand, as a workpiece support device for a grinding machine that grinds the inner circumferential surface of an annular workpiece, the lowering position of the upper roller of a support arm rotatably supported on a frame is adjusted by a fixed stop on a mounting plate provided at the top of the frame. It has been proposed that the above-mentioned support arm is regulated by a movable stopper on the rear end side upper surface, and the regulated position is held by a spring and a clamp cylinder (Utility Model No. 51).
-Refer to Publication No. 50484).

However, in the 2 roller 1 show type mentioned above,
The upper roller is pressurized by a pressure cylinder, but since there is no restriction on the pressure position, there is a problem in that vibrations of the upper roller or the workpiece cause large variations in the machining dimensions of the workpiece.

In addition, in the latter case where the stopper member is fixed, the upper roller is only cantilevered and held under pressure by the stopper and clamp cylinder on one side of the support arm's spindle, so oil pressure fluctuations etc. Pressure force fluctuates due to
As a result, a problem arises in that the width of variation in the descending dimension of the work increases.

(Purpose of the invention) The present invention was made in order to solve the above-mentioned conventional problems, and the lowering (pressure) position of the upper roller is reliably regulated by appropriate regulating force and pressing force. The purpose of this is to reduce the variation width of the machining dimensions of the workpiece.

(Structure of the invention) Therefore, the present invention is a workpiece support device for a two-roller, one-shoe type internal grinding machine, in which the workpiece is rotatably supported by an arm member attached to the base by a hinge shaft, and the upper part of the workpiece is An upper roller is pressurized and supported by a pressure cylinder on one side of the hinge shaft of the arm member, and the upper roller is fixed to the base and stops the downward movement of the arm member on the other side of the hinge shaft of the arm member. A stopper member of the clamp cylinder that regulates the lowering position of the roller, an oil passage for synchronous operation that communicates with the oil chamber for pressurizing the roller of the pressure cylinder and the oil chamber for pressurizing the stopper member upward of the clamp cylinder are provided. It is characterized by the presence of

(Operation, Effect) According to the present invention, one side of the arm member with the hinge axis as a boundary is pressurized and supported by a pressure cylinder, and the other side is supported by a pressure cylinder by a stopper member consisting of a clamp cylinder. In addition to regulating the lowering position of the upper roller while receiving pressure, the oil chamber for pressing the roller of the pressure cylinder and the oil chamber for pressurizing the stopper member upward of the clamp cylinder are connected to each other using oil for synchronous operation. Because they are connected by a passageway, the pressing force from the pressure cylinder of the upper roller and the regulating force from the clamp cylinder are always balanced at a constant ratio, and the pressing force of the upper roller against the workpiece is kept at the allowable value (set value). ) Even if the force becomes stronger, the regulating force also becomes stronger correspondingly, and if the workpiece is deformed by applying more pressure than necessary, it will no longer be damaged. Conversely, even if the pressing force of the upper roller is insufficient, the regulating force will be correspondingly weakened, so that problems such as those caused by the workpiece flying up will not occur, and the workpiece will be pressurized and restrained in a well-balanced manner. This allows for high-precision grinding.

Furthermore, according to the present invention, since the upper roller can be supported in a well-balanced manner, accurate grinding can be performed even on workpieces with variations in outer diameter or non-perfect circles, and fluctuations in hydraulic pressure can be reliably absorbed. This enables stable grinding.

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

As shown in FIGS. 1 and 2, the work supporting device of the internal grinding machine includes a lower roller 3 rotatably supported by a horizontal shaft 2 at the bottom of a base 1 and supporting the bottom of an annular work W. It is provided.

Further, a shoe member 6 is provided which is fixed to the side of the base 1 with bolts 4, 4 and supports the side of the workpiece W with a chip 5.

An insute 7 located above the rear side of the shoe member 6 is fixed to the side of the base 1, and a workpiece W is dropped and supplied onto the shoe member 6 by the insitue 7. The material is pushed by the pusher 9 of the loading cylinder 8 installed on the side of the material, and is sent to the supply position where it is supported by the lower roller 3 and the shoe member 6.

On the other hand, the upper part of the base 1 has a hinge shaft 11 on the rear side.
(See Figure 3) An arm member 12 is mounted to be movable up and down, and on the front side of the arm member 12 is an upper roller 14 that is rotatably supported on a horizontal shaft 13 and supports the upper part of the workpiece W. It is provided.

The workpiece W is supported at three points by two rollers, the upper roller 14 and the lower roller 3, and one shoe, the shoe member 6.

Pulley 14 of the upper roller 14 and lower roller 3
A, 3a are connected to the electric motor 1 via an intermediate pulley 15.
A belt 17 is stretched between the pulley 16a of No. 6, and the upper and lower rollers 14 and 3 are rotated in the same direction by the electric motor 16.

An arm member 1 is provided on the rear side of the arm member 12.
2, an unload cylinder 18 that moves the upper roller 14 up and down together with the arm member 12, and a pressure cylinder 1 that presses the upper roller 14 in the downward direction together with the arm member 12.
9 are connected.

At the lower front side of the arm member 12, there is a clamp cylinder 2 fixed to the base 1 with a bracket 20.
1 is provided, and the stopper member (piston rod) 22 of the clamp cylinder 21 is connected to the arm member 12.
The lower surface of the front part 12a of the upper roller 14
The lowering (pressurization) position of the is now regulated.

As shown in FIG. 3, loading cylinder 8, unloading cylinder 18, pressurizing cylinder 1
9. Pressure oil is supplied and discharged to and from the clamp cylinder 21 by an electromagnetic switching valve 24, and the oil chamber 19a for pressurizing the roller of the pressure cylinder 19 and the oil for pressurizing the stopper member of the clamp cylinder 21 to raise it are connected to each other. It communicates with the chamber 21a through a synchronous operation oil passage 25.

With the above configuration, when the workpiece W is pushed by the pusher 9 by the loading cylinder 8 while the upper roller 14 is moved upward together with the arm member 12 by the unloading cylinder 18, the workpiece W is It is fed into the supply position where it is supported by the lower roller 3 and the shoe member 65.

Then, the upper roller 14 is moved downward together with the arm member 12 by the unload cylinder 18, and the upper roller 14 supports the workpiece W. Then, the upper roller 14 presses the workpiece W via the arm member 12 by the pressure cylinder 19. .

At this time, the lower surface of the front part 12a of the arm member 12 is brought into contact with the stopper member 22 of the clamp cylinder 21, so that the upper roller 14 is lowered (pressurized).
Location will be regulated.

Therefore, when the upper and lower rollers 14, 3 are rotated by the electric motor 16 and the workpiece W is rotated accordingly, the stopper member 22 prevents the upper roller 14 from moving downward more than necessary, so that vibrations of the upper roller 14 and the workpiece W are reduced. As a result, the width of variation in the descending dimension of the workpiece W by the grindstone 23 (see FIG. 2) becomes smaller.

Furthermore, even if pressure fluctuations occur during operation,
The ratio of the regulating force on the upper roller 14 by the stopper member 22 and the pressing force on the upper roller 14 by the pressure cylinder 19 does not change, and the regulating force and the pressing force are adjusted to suit the thickness or strength of the annular workpiece. can be easily set simply by adjusting the hydraulic pressure of the pressure oil used.

FIG. 4 shows pressurizing data using a conventional work supporting device without a stopper member, and FIG. 5 shows machining data using a work supporting device according to the present invention having a stopper member.

As is clear from this data, the variation width was 7μ in the conventional case, but it was reduced to 4μ in the present invention.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a workpiece support device according to the present invention, FIG. 2 is a side view showing the relationship between upper and lower rollers, the shoe member, and the workpiece, FIG. 3 is a hydraulic circuit diagram of the device shown in FIG. 1, and FIG. The figure is a graph showing conventional processing data, and FIG. 5 is a graph showing processing data of the present invention. DESCRIPTION OF SYMBOLS 1... Base, 3... Lower roller, 6... Show member, 11... Hinge shaft, 13... Arm member, 1
4...Upper roller, 18...Unload cylinder,
19... Pressure cylinder, 21... Clamp cylinder, 22... Stopper member.

Claims (1)

[Scope of Claim for Utility Model Registration] A work support device for an internal grinding machine that grinds the inner circumferential surface of an annular workpiece, which comprises a lower roller rotatably supported on a base and supporting the lower part of the workpiece, and a lower roller on the base. A shoe member is fixed and supports the side of the workpiece, and an arm member attached to the base by a hinge shaft is rotatably supported, and the upper part of the workpiece is supported by a pressure cylinder on one side of the hinge shaft of the arm member. and a stopper member of a clamp cylinder which is fixed to the base and stops the downward movement of the arm member on the other side of the hinge axis of the arm member, thereby regulating the lowering position of the upper roller. A work support device for an internal grinding machine, characterized in that a synchronous operation oil passage is provided that communicates the oil chamber for pressurizing the roller of the pressure cylinder and the oil chamber for pressurizing the stopper member upward of the clamp cylinder.