JP3102995U - Rubber Extruder Mold Mold - Google Patents

Abstract

[PROBLEMS] In a conventional mold, a rubber molded product of a rubber extruder has a large error in a dimension of a die process, a dimension of the rubber molded product, and an acute angle portion. This provides for increased accuracy.
In order to solve the above-mentioned problems, the mold of the present invention has the same mold processing as a rubber molded product, and further has an accuracy improving hole from the front part to the rear part of the mold. By performing this, the accuracy of the rubber molded product can be improved.
[Selection diagram] Figure 1

Description

  The present invention relates to a die for an extrusion opening of a rubber extruder for processing a rubber molded product used for various purposes, for example, as a wiper blade of an automobile or a part thereof.

  FIG. 1 shows an example of a mold mounted on a rubber extruder. This mold is attached to the extrusion opening of the rubber extruder. The mold is processed to have almost the same shape as the rubber molded product. The rubber material in the molten state is extruded by a rubber extruder, and a rubber molded product having substantially the same shape as a mold is obtained. The dimensional accuracy and sharp corners of the rubber molded product had a large error with the mounting die processing dimensions.

  In the above-mentioned conventional mold, a rubber molded product having substantially the same shape as the mold dimensions has been obtained. The accuracy of the dimension and acute angle of the rubber molded product by the rubber extruder greatly differed from the mold processing dimension. In particular, a rubber molded product obtained by a rubber extruder has a problem that it lacks an acute angle portion.

  In order to solve the above-mentioned problems, the mold of the present invention has the same mold processing as the rubber molded product, and further has an accuracy improving hole 1 from the front part to the rear part of the mold. By applying this, the pressure applied to the rubber material in the molten state by the rubber extruder is adjusted, the error in the dimensional accuracy between the die processing dimension and the extruded rubber molded product is small, and the required acute angle portion can be obtained.

  The mold of the present invention was mounted on a rubber extruder, and the error in the dimensions of the mold and the size of the rubber molded product was reduced. In this embodiment, the acute angle portion 3 of the rubber molded product d is a portion requiring the most dimensional accuracy and acute angle. In the mold processing of the present invention, a precision improvement hole is formed in the mold corresponding to the location of the acute angle portion 3 which requires accuracy, and a rubber molded product with a small dimensional error from the mold is obtained.

  With the aim of obtaining the dimensional accuracy and the acute angle of the rubber molded product, the processing form of the die and the adjustment of the rubber extruder machine have been minimized, and a rubber molded product with a small dimensional error from the die has been realized.

  The present invention will be described with reference to examples. FIG. 1 is a perspective view of a mold according to an embodiment. The size of the mold is about 30 mm in diameter, about 30 mm in length, and a stopper portion corresponding to an entrance portion of a rubber material is about 5 mm in thickness and about 40 mm in diameter. FIG. 3 shows a cross section of the rubber molded product. The mold of this embodiment is mounted on a device of a rubber extruder and fixed at a position of an outlet portion of the device. The acute angle portion 3 of the rubber molded product d is a portion that requires higher dimensional accuracy and an acute angle than the acute angle portions 4 and 5. The precision improvement hole 1 of the mold a corresponds to the entrance of the molten rubber material. The hole at the entrance is somewhat large and gradually decreases toward the exit. In the present embodiment, the size of the precision improvement hole was set to about 5 mm. The precision improvement was about 10% in size, and the sharp corner 3 was improved from about 1R to about 0.5R. The precision improvement hole corresponds to a portion indicated by a dotted line of the precision improvement hole 1 in FIG. The exit surface of the mold processing is the same processing surface as the rubber molded product, and the precision improvement hole is not visible.

When a molded product is processed by applying pressure to a material in a molten state as in a device of a rubber extruder, it can be applied to general die processing for obtaining better dimensional accuracy and an acute angle portion.

1 is a perspective view of a mold according to an embodiment of the present invention. 1 is a cross-sectional view of a rubber molded product according to an embodiment of the present invention. It is the front view (a) and side view (b) of the metal mold | die which is an Example of this invention.

Explanation of reference numerals

1 ・ ・ ・ ・ ・ ・ Accuracy improvement hole of mold
2 ... Holes in the mold
3 ... Sharp corner of rubber molded product
4 ... Sharp corner of rubber molded product
5 ... Sharp corner of rubber molded product
a ... Perspective view of the mold
b ・ ・ ・ ・ ・ ・ Front view of the mold
c ・ ・ ・ ・ ・ ・ side view of mold
d ・ ・ ・ ・ ・ ・ Cross section of rubber molded product

Claims (2)

A mold to be mounted on the rubber extruder of the device that melts the rubber material. 2. The mold according to claim 1, wherein a precision-improving hole is provided for improving the dimension and the acute angle of a rubber molded product molded by a rubber extruder.

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