Cylindrical tube interior convex molding die

Abstract

The invention provides a cylindrical tube interior convex molding die which is high in molding efficiency and capable of guaranteeing the molding quality of products. The die comprises a fixed lower die body and an upper die body which is arranged above the lower die body and can be pressed downwards. The upper surface of the lower die body, in the length direction of the lower die body, is provided with a through groove of which the longitudinal section is semicircular, and a mandrel is arranged inside the through groove. The mandrel comprises an upper half mandrel body and a lower half mandrel body, the upper surface of the upper half mandrel body is provided with a groove, and a male die which can be pressed downwards is arranged over the groove. The die further comprises a flat key, a first air cylinder and a second air cylinder, the upper half mandrel body and the lower half mandrel body are connected through the flat key axially arranged, and the flat key is arranged at one end of the upper half mandrel body and one end of the lower half mandrel body, so that neither the upper half mandrel body nor the lower half mandrel body has the degree of freedom for radial sliding. The lower half mandrel body is connected with a piston rod of the first air cylinder in the axial direction, and the upper half mandrel body is connected with a piston rod of the second air cylinder in the radial direction of one end of the upper half mandrel body.

Description

technical field [0001] The invention relates to a mould, in particular to an inner convex molding mold of a cylindrical cylinder. Background technique [0002] The main function of the cylinder is to provide a relatively stable working environment for the mechanism, instrument or equipment arranged inside it. The cylinder is divided into cylindrical cylinder and spherical cylinder. When the diameter of the cylindrical cylinder is small, it can be directly made of seamless steel pipe; Form two semi-cylinders, and then weld the two together with a weld to form a cylindrical cylinder. [0003] In practice, according to needs, the cylinder wall of the cylindrical cylinder is often made into a concave shape, such as the outer cylinder for motorcycles and automobile mufflers. At present, the inner convex forming mold of the cylindrical barrel includes a fixed lower mold and an upper mold arranged above the lower mold and having a degree of freedom perpendicular to the lower mo...

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Problems solved by technology

[0005] The mold with the above structure has the following problems: 1. Every time a product is formed, the mandrel needs to be manually placed and taken out, the labor intensity of the workers is high, and the molding efficiency is also low; The operation can make the relative positions of the two mandrels consistent, and it is easy to slip between the two mandrels during molding, which will affect the molding quality of the product

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