Cylinder head cover breather pipe machining die

Abstract

The invention discloses a cylinder head cover breather pipe machining die which is characterized by comprising a primary bending die and a secondary bending die; the primary bending die consists of an ejector rod, and a primary upper die and a primary lower die that are matched with each other, a primary bent cavity matched with a breather pipe is arranged between the primary upper die and the primary lower die, the bending angle of the primary bent cavity ranges from 100 degrees to 130 degrees, and the ejector rod can extend in the primary bent cavity; the secondary bending die consists of asecondary bending fixed sleeve and a secondary bending handle which are both provided with secondary bent cavities matched with the breather pipe, and an external camber surface similar to the internal camber surface at the bent part of the breather pipe is arranged at the end of the secondary bent cavity of the secondary bending fixed sleeve. By using the cylinder head cover breather pipe machining die effectively, the technical problem that due to thin wall and large bending angle, the breather pipe is easy to cause cracks at the bent part after being directly bent and can not meet the technical requirements can be solved, and the breather pipe of an automobile engine cylinder covers of the series technical requirements is localized, thus lowering the cost.

Description

technical field [0001] The invention relates to the technical field of cylinder head cover ventilation pipe processing, in particular to a cylinder head cover ventilation pipe processing mold. Background technique [0002] The air pipe of the cylinder head cover of the automobile engine is generally a steel pipe. According to its working requirements, the inner and outer surfaces are not allowed to have cracks, folds, rolling folds, delamination, scarring and corrosion, and keep 30s without leakage under the condition of air pressure of 9.8kpa . When the ordinary steel pipe is processed into a ventilation pipe, the steel pipe needs to be bent into a 90-degree bend. After the steel pipe is bent, the wall thickness of the outer edge of the bend cannot be reduced by more than 30%. [0003] At present, when processing the ventilation pipe, the processing technology of direct bending is adopted, that is, the steel pipe is bent into a 90-degree bend at one time by applying a bend...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a cylinder head cover breather pipe processing mold to solve the technical problems of cracks, out-of-roundness and failure to meet technical requirements caused by the direct bending process of the breather pipe

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