JPS6050567B2 - Method for removing burrs from rubber-like elastic bodies - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for removing burrs from a comb-shaped elastic body.
More specifically, it is an object of the present invention to propose a method with excellent performance for cutting and manufacturing a toric body of a rubber-like elastic body with a good cutting surface condition.

When molding a rubber-like elastic body, burrs are generated on the mating parts of the molds. Conventionally, as a technique for removing burrs, as shown in FIG. 2 is composed of a disk-shaped membrane 3 and a substantially cylindrical body 4 located at its axial center, and the annular molded product 1 is attached to a holder 5 made of a medium cylindrical body such as metal, which is rotationally driven by a rotation mechanism. It was glued and cut by a blade 7 that moved back and forth toward the inner peripheral end 6.

However, according to this method, just before the cutting of the burr 2 is completed, that is, at the time of the final cutting rotation, the separated part of the burr 2 hangs down due to its own weight, and is further swung out in the outer diameter direction by the action of centrifugal force, and is still attached to the base material. The connected parts will be drawn toward the axis. As a result, since the cutting position of the blade 7 does not change in the part connected to the base material, the part of the annular molded product 1 that is drawn toward the axis is cut, and a part of the cutting surface is cut. This creates concave cutting parts, which makes it difficult to make the product uniform, and also poses a fatal problem in the case of products such as oil seals. In view of the above-mentioned problems, the present invention was made for the purpose of eliminating the concave cutting part during deburring work, and by changing the shape of the burr to be removed from a disc-shaped film to a substantially hollow conical film, the final cutting part is This is to suppress the withdrawal of the base material of the part toward the axis, and to shape the final cut surface.

Hereinafter, the method for removing burrs from a comb-shaped elastic body according to the present invention will be explained in more detail with reference to FIG.

(a) When molding an annular molded product 1 of a rubber-like elastic body, a substantially hollow conical membrane 8 tilted in the axial direction from the inner peripheral end of one end of the annular molded product 1, and the hollow A burr 2 consisting of a substantially cylindrical body 4 protruding from the axis of the conical membrane 8 is formed.

(b) A cylindrical holder 5 is used to hold the outer periphery or circumferential portion of the annular molded product 1 so that the axis is oriented in the vertical direction and the rotating axes are aligned. The tool 5 is rotated at an appropriate speed by a rotational drive mechanism (not shown).

(c) The cutter 7 is supported and held so that it can move forward and backward toward the inner corner 6'' of the annular molded product 1 and burr 2 to be cut mainly from the axis side, and the diameter is adjusted by a forward and backward drive mechanism (not shown). (d) First, with the annular molded product 1 having the burr 2 to be removed attached to the holder 5, the holder 5 is rotated at a speed necessary for cutting.

(e) After positioning the cutting edge of the cutter 7 on the extension line of the cutting portion of the annular molded product 1, the cutter 7 is advanced and cut together with the rotation of the holder 5.

The burr 2 is removed from the annular molded product 1 by the above-mentioned cutting, but in this case, since the burr 2 consists of a hollow conical membrane 8 and a substantially cylindrical body 4, the comparison is made as the holder 5 rotates. A large gyroscopic effect occurs on the burr 2, and even if a part of the burr 2 is removed, the rotation axis of the burr 2 becomes difficult to tilt, and the burr 2 is not blown away in the radial direction and can be cut. It rotates and falls down the axis.

As a result, the angles of the corners of the annular molded product 1 and the burr 2 with respect to the cutter 7 are held constant until the end of cutting, and the cut surface becomes uniform.

In the embodiment described above, the hollow conical membrane 8 of the burr 2 had a shape that protruded below the axis, but the hollow conical membrane 8 was formed into a shape that protruded above the axis. has the same effect.

However, in this case, a suction device may be required to remove the cut burr 2. As described above, according to the method for removing burrs from a rubber-like elastic body of the present invention, since the shape of the burrs is a hollow conical film, the gyroscopic effect of the burrs due to shaft rotation becomes large, and the burrs are completely removed. Since the initial posture is maintained until it is removed, the cutting surface becomes uniform over the entire circumference.

Furthermore, since the method of the present invention does not cause the separated burrs to scatter in the radial direction, it also has features such as saving the labor of removing burrs, and the effects of the present invention are extremely large. .

[Brief explanation of drawings]

The drawings are explanatory diagrams showing a method of removing burrs from a comb-shaped elastic body according to the present invention, FIG. 1 is an explanatory diagram showing a conventional method, and FIG. 2 is an explanatory diagram showing an embodiment of the method of the present invention. DESCRIPTION OF SYMBOLS 1... Annular molded product, 2... Burr, 3... Disc-shaped membrane, 4... Approximately cylindrical body, 5... Holder, 6... Inner peripheral end, 6'' ...Inner corner, 7. Blade, 8. Hollow cone membrane.

Claims (1)

[Claims] 1. The burr of an annular body formed from a rubber-like elastic body is formed into a hollow cone-like membrane formed by tilting in the axial direction from the inner end of the annular body, and the annular body is driven at a predetermined circumferential speed by a drive device. A rubber-shaped tool that is attached to a rotating holder so that its rotation axis and axis are perpendicular, and that the cutter is moved radially between the annular body and the burr to cut and remove the burr in conjunction with the rotation of the holder. How to remove burrs from elastic bodies.