SU122423A3 - Method for the production of asbestos-cement tubular products with external branches, for example, elbows, tees, etc. fittings - Google Patents

Description

Methods are known for producing asbestos-cement tubular products with external branches, for example, bends, tees and the like fittings, by pressing them out from the inside in molds using an elastic core made in the form of a rubber bag, which is given elasticity by introducing compressed medium into its cavity.

To simplify the production process of asbestos-cement tubular products, a blank is proposed for the product to be molded from sheet asbestos cement on a prestressed core, which, after applying an appropriate layer of raw material on it, is placed into a mold and by pressing the elastic medium in the core cavity to compress it to the required dimension. and density of the finished product. At the same time, in order to impart relative rigidity to the ends of the core, elastic elastic sleeves with flanges on the ends are worn on them, and in order to prevent the core from bulging at the points of branch connections, elastic bridges with holes for the passage of the compressed medium are arranged in their mouths.

The drawing shows the form for the manufacture of asbestos-cement tubular products according to the proposed method in relation to the manufacture of a tap.

In this case, a rubber bag is used as a core, formed from interconnecting hoses 1 and 2, overhanging no. 122423-2 at the ends with membranes 3, 4 and 5, the latter being equipped with a valve 6 for supplying the compressed medium. The hoses have a much smaller diameter, Meivf has an inner diameter of a formable body 7. Elastic elastic sleeves 8 with outer flanges 9 and an inner diameter significantly larger than the outer diameter of the hoses / and 2 are put on the ends of the bag. These sleeves give stiffness to the ends of the bag. At the point of connection of the hose 2 to the hose / there is an elastic non-tong 10 with a hole L for the passage of the compressed medium.

In the molding of the hollow body 7, a compressed medium is introduced into the core through the valve 6, previously pressing the core. Then, the corresponding layers of sheet asbestos cement are laid on it and placed in the mold 12, after which, by increasing the pressure of the elastic medium in the bottom of the core, the workpiece is pressed to the required dimension and density of the finished product.

By relieving the pressure of the compressed medium, a vacuum is created in the cavity of the core, allowing it and the bushes to be removed from the cavity of the molded product.

Subject invention

Claims (3)

1. A method of producing asbestos-cement tubular products with external branches, for example, bends, tees and the like fittings, by pressing them out from the inside in molds, using an elastic core, made in the form of a rubber bag, which is given elasticity by introducing a compressed medium into its cavity, which is different the fact that, in order to simplify the production process, the blank for the product of sheet asbestos cement is formed on a prestressed core, which, after applying a suitable layer on it the source material is placed in the form and, by increasing the pressure of the elastic medium in its cavity, they press the billet to bring it up to the required dimension and density of the finished product. 2. A method according to Claim 1, characterized in that, in order to impart relative rigidity to the core ends, elastic elastic sleeves with flanges on the ends are put on them. 3. Application in the method according to paragraphs. 1 and 2 of the core, in which, in order to prevent its bulging at the points of attachment of branches, elastic bridges with openings for the passage of compressed medium are arranged in the mouths of the branches.