A kind of open cavity extrusion molding die

Abstract

The invention discloses an extrusion forming die for an open mold cavity. The extrusion forming die mainly comprises an extrusion punching die body and an extrusion pulling die body. In the extrusion punching stage, the open mold cavity is formed by a first female die and a second female die. The second female punching die is of a floating structure and moves downwards along an upper die, the forming load is reduced, and the bend resistance bearing capability of a male die is improved. After a blank makes contact with a first jacking rod, the upper die and an upper ramming cylinder are depressurized; piston rods of a left piston cylinder and a right piston cylinder move upwards to support a female die supporting ring; a left movable supporting block and a right movable supporting block are pulled out horizontally under the effect of a moving and resetting system; a lower die sleeve and the female die supporting ring overall move downwards under the effects of the resilience force of a spring and the pressing force of the upper ramming cylinder in the return stroke process of the left piston cylinder and the right piston cylinder; and when the blank makes complete contact with a lower fixed plate, the open mold cavity is formed again at the moment. The thinning pulling times can be effectively decreased, forming defects such as pull cracks and pull fractures are prevented, and the extrusion forming die for the open mold cavity can be applied to forming of various deep blind hole thin wall products.

Description

technical field

[0001] The invention relates to an extrusion mold with an open cavity. Background technique

[0002] Thin-wall products with deep blind holes mostly adopt the traditional drawing forming process. The design method of this process mainly depends on the diameter D1 of the inner hole of the final forging, and the design extrusion is carried out according to the principle that the length-to-diameter ratio of the inner hole does not exceed 3, that is, h1≤3×D1. For pressing punching parts, the outer diameter D0 of the extruding punching parts is determined according to the principle of equal volume, and then the blanking size of the bar is determined; this inevitably results in a large wall thickness of the designed extrusion punching parts, and in the long-distance drawing process The middle metal gathers upward quickly. When the drawing deformation is close to the solid bottom area of ​​the inner hole, two large parts of metal with a solid bottom and a thick wall...

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