SU1675111A2 - Mould for making v-belts - Google Patents

Abstract

The invention relates to the manufacture of rubber products and can be used to make unbroken V-belts of an arched structure. The purpose of the invention is to obtain a layerless belt. For this, an additional elastic forming element 5 is placed in the forming cavity 3 at its larger base. Element 5 is made of heat-resistant rubber with a monolithic trapezoidal section, the larger base of which exceeds the larger base of the forming cavity. During the formation, the outer surface of the elastic forming element 4 acquires a convex shape, and the inner surface of the elastic forming element 5 becomes concave. 3 il. O O s SP //./ hO

Description

The invention relates to the manufacture of rubber products and can be used for the manufacture of unbroken V-belts of an arched structure and is an improvement of the known technical solution according to ed. St. No. 1565707.

The purpose of the invention is to obtain beskoloyny belts.

FIG. 1 shows the proposed mold; in fig. 2 is the same in the start position of the molding; FIG. 3 - the same, in the open position after vulcanization of the belt.

The mold for the manufacture of V-belts contains rigid forming elements in the form of half-molds 1 and 2. Forming an annular forming cavity 3 of trapezoidal section, at the smaller base of which is placed an elastic forming element 4, an additional elastic hermetic element 5. Elements 4 and 5 are made in the shape of a stake . c from heat-resistant rubber, in particular from siloxane, with a monolithic trapezoidal section. The smaller base H of element 4 is made larger than the smaller base h of h f o r u m y and the cavity, and the larger base L of element 5 is larger than the larger base of I of the forming cavity. The forming elements are made of a material having a coefficient of thermal expansion greater than the workpiece material re mn.

The mold works as follows

The blank b of the V-belt is laid in the half-form 1 (Fig. 2). In this case, the size H of the smaller base of the section 4 of the element exceeds the size h of the smaller base of the annular forming cavity 3, and the size L of the larger base of the section of the element 5 exceeds the size I of the larger base of the cavity 3. Then the mold is installed on the plates of a vulcanizing press (not shown). Under the pressure of the press, when the half-form 1 and 2 are closed, the elastic elements 4 and 5 deform,

In this case, the outer surface 7 of the element 4 acquires a convex shape, and the inner surface 8 of the element 5 becomes concave (Fig. 1). Due to the deformation of the elastic elements 4 and 5, complete sealing is achieved.

cavity, resulting in the elimination of the rubber mixture of the workpiece from the cavity, in addition, creates a significant radial pressure on the workpiece belt. Due to the deformation of element 4 and 5, the billet takes on an arched shape. Next, the mold is heated, with the elastic elements 4 and 5 expanding more than the material of the V-belt preform 6, as a result of which the pressure in the forming cavity increases. After vulcanization, the press is opened, the mold is removed from the press. At the time of opening the mold (Fig. 3), elements 4 and 5 take the initial

form. Then the belt 9 is removed from the open mold. During recharging, the mold is cooled. A new V-belt preform is then loaded and the cycle repeats.

V-belts manufactured in

the proposed mold is flat and high quality.

Claims (1)

The invention of the mold for the manufacture of V-belts on Aug. St. N; 1565707, in order to obtain, without straps, it is equipped with an additional elastic forming element installed in the forming cavity at its larger base and made of heat-resistant rubber with a monolithic trapezoidal section, the larger base of which exceeds largest larger mold cavity. w J