SU1720870A1 - Press-mold for making ring-shaped mechanical rubber goods - Google Patents

Description

1

The invention relates to the manufacture of rubber products and can be used for the manufacture of batt-free products, namely wedge and toothed endless belts.

The purpose of the invention is to expand the technological capabilities of the mold.

Figure 1 shows the mold in a closed state; figure 2 - the same, at the time of the beginning of the closure of the half-form; on fig.Z - section aa in figure 1.

A mold for manufacturing annular rubber products contains upper 1 and lower 2 half-molds with wedge-forming surfaces 3 and 4 and annular shaping elements 5 and 6 placed between them. The latter have wedge platforms at their ends for contacting half-molds, which are made according to - IU forming surfaces 3 and 4 half-form. Ring forming elements 5 and 6 are made of elastic with trapezoidal section.

The elastic ring elements 5 and 6 are made of heat-resistant rubber 7 and metal fittings 8, the metal fittings 8 are made in the form of a corrugated ring with corrugations arranged parallel to it forming it. The angles ai / 5c of the radial sections of the mold and forming elements 5 and 6 are equal and exceed the friction angle of the elastic elements along the conical surfaces 3 and 4. In the central hole of the half-form, there is a sleeve 9.

The mold for the manufacture of rubber rubber products works as follows.

An annular billet of the product (not shown) is placed in the annular forming cavity 10 between the forming surfaces 11 and 12 of the elastic elements 5 and 6. Then the half-form 2 is covered with the half-form 1, and the mold is fed into a vulcanization press (not shown). In this case, the elastic elements 5 and 6 interact with the conical surfaces of the 3 and 4 half-molds. Under the pressure of the press

These elements 5 and 6, slid along conical surfaces 3 and 4, radially move towards each other, form a non-lobular ring gear. Next is vulcanization, after which the press opens, the mold is opened, and the elastic elements 5 and 6 occupy the initial position, detached from the finished toothed product, which is then easily removed from the mold. Due to the fact that elements 5 and 6 have a large radial movement due to corrugations, the blank placed in the mold can have significant size variations both in diameter and in cross section.

Varying the profile and dimensions of the elastic elements 5 and 6, in the proposed mold, it is possible to manufacture flat-layer wedge, flat and toothed belts of various designs and similar rubber-rubber products. Next, a new billet is placed in the mold, and the cycle is repeated.

Claims (3)

1. A press mold for the manufacture of ring rubber products, comprising upper and lower half molds with wedge forming surfaces and ring shaped shaping elements interposed between them, having wedge platforms for contacting with half molds at the ends, characterized in that possibilities of the mold, annular shape-generating elements are made of elastic with trapezoidal section, and their wedge areas are made of the shape-forming surface surface m half-form. 2. The mold according to claim 1, which means that the elastic annular forming elements are made of heat-resistant rubber and metal fittings. 3. The mold according to claim 2, characterized in that the metal reinforcement is made in the form of a corrugated ring with corrugations arranged parallel to it forming it. five 3