SU1500504A1 - Method and apparatus for producing annular rubber engineering articles - Google Patents

Abstract

The invention relates to the manufacture of rubber ring products and is intended for the manufacture of endless flat-toothed belts. The purpose of the invention is to improve the quality of the products and expand the technological capabilities of the device by enabling the manufacture of timing belts. For this, the upper plate 4 is made larger in diameter of the core 1. The shaping surfaces 10 and 11 of the upper 6 and lower 5 half-molds facing the core 1 are made conical and with large bases facing the casting slot 8. In the manufacture of products, the elastomer blank is made of two parts . One part is stirred on the core 1 over the reinforcing cord. The second part of the preform is inserted into the mold concentric with the core 1. During the molding of the product, the plunger 9 acts on the second part of the preform. At the same time, the elastomer through the sprueshell is squeezed into the forming cavity and acts on the first part of the workpiece. 2 sec. f-ly, 1 ill.

Description

: l

about

: l

four

3150

The invention relates to the manufacture of hardware products and is intended for the manufacture of endless flat-toothed drive belts.

The purpose of the invention is to improve the quality of products and expand the technological capabilities of the device by enabling the manufacture of toothed belts.

The drawing shows the proposed device for the manufacture of annular rubber products, the cut.

The device for making annular radio products contains a core 1 with a toothed side surface, a bottom plate 2 with a central eraser 3 for mounting

core 1 and the top plate 4. Concentric to the core 1 is located with the formation of the forming cavity detachable mold with the bottom. 5 and the top 6 half-molds. In the lower half-form 5, the loading chamber 1 is complete. The upper half-form 6 is installed with the possibility of axially moving relatively lower and forming a gate slit 8 on the plane of their connector. With the possibility of axial movement in the loading chamber 7, the plunger 9 is in contact, which contacts at the end of the working stroke with the upper half form. The top plate 4 is made of a larger core 1 in diameter. The shaping surfaces 10 and 11 of the lower 5 and upper 6 half-molds facing the core 1 are made conical and with large bases facing the sprue slot 8.

The method of manufacturing the rubber goods is carried out as follows.

The bottom plate 2 with the core 1 and the top plate 4 fixed to its rubbed 3 is fixed in the chuck of the lathe. Previously, a wear-resistant lining in the form of a fabric stocking is installed on the core. On a lathe, a reinforcing cord is wound on a fabric stocking. An elastomer billet for injection molding an annular product, in particular an endless toothed belt, is made up of two parts. One part of the elastomer blank is placed on the core 1 on top of the reinforcing cord, then the core 1 is placed in the lower mold 5, into the loading chamber 7 of which is concentrated to the core 1 along the horizontal plane of symmetry of the product, a part of the harness is placed.

Install the upper mold half and the plunger 9 and place the device in a vulcanization press. By lowering the upper heated press plate onto the plunger 9, a predetermined pressure is applied, while the plunger 9 is lowered and acts on the second part of the elastomer billet placed in the loading chamber 7. From the loading chamber, the elastomeric material is squeezed into the forming cavity under pressure 8 and has a pressing effect on the material of the first part of the workpiece elastomer. At the end of the working stroke, the plunger 9 comes into contact with the upper half-form 6 and locks the forming cavity. The final molding and pressing of the product 12 is carried out.

Due to the conical molding surfaces 10 and 11 of the half-molds 5 and 6, a uniform pressure is created practically over the entire height of the product, which ensures complete pressing of the teeth of the flat-toothed belts, including those with a small modulus. After reprocessing, it is necessary to vulcanize the raw rubber. After exposure, remove the device from the press, disassemble it and the finished ring product is removed from the core. In the future, the annular product is ground to an outer diameter and cut into endless belts of a given width.

The proposed method and device allows to obtain high-quality flat-toothed belts, in particular, with a small module, under conditions of both mass production and small-scale production without significant costs for their production, which is especially important in the case of a large range of belts.

Claims (1)

1. A method of manufacturing annular rubber products, with kS15 A wear plate and a reinforcing cord are placed on the core of the teeth), an elastomer preform is installed and, by injection molding, an annular product of a given profile is formed in a mold, characterized in that, in order to improve the quality of the products, the elastomer blank is divided into two parts. parts, one of which is placed on the core over the reinforcing cord, and the second is placed in the mold concentrically to the core along the horizontal plane of symmetry of the latter; ) t plunze- | ROM for the second part of the workpiece. 2, An apparatus for manufacturing annular rubber products, comprising a core, a bottom plate with a central core for mounting the core, a top plate, and a distiVi6 placed concentrically to the core with the image of the OB cavity of the forming cavity, the slot of the preprss-form, in the lower half-form of which the loading chamber is made, and the upper half-form is installed with the possibility of axial movement from the bottom to form a discontinuous slot, and the contact At the end of the working stroke, with the upper half-form, the plunger, which is distinguished by the fact that, in order to expand its technological capabilities 15 devices by providing the possibility of manufacturing toothed belts, the top plate is made larger in diameter of the core, and the shape-generating formers facing the core 20, the surfaces of the upper and lower half-molds are filled with special and turned over large bases to the gating gap.