Three-petal internal expansion mould

Abstract

The invention provides a three-petal internal expansion clamping fixture in order to reduce or eliminate deformation generated in the heat treatment production process of cylindrical parts, especially thin-wall long cylindrical parts. The invention discloses a three-petal internal expansion mould which comprises a mould upper fixing plate (5), mould petals (6), a mould lower fixing plate (7), mould petal bolts (8), mould fixing plate key-shaped holes (10), a mould main shaft (11), a mould main shaft upper wedge-shaped boss (12) and a mould main shaft lower wedge-shaped boss (13), the cylinder part is sleeved on the mould, the mould is lifted, the mould petals slide downwards under the action of gravity, and when the mould petals make contact with the inner wall of the cylinder part, the mould petals stop sliding downwards, and at the moment, the upper and lower end slopes of the inner walls of the mould petals make contact with the slopes of the upper and lower wedge-shaped bosses of the mould main shaft and are fixed at the positions. And therefore, the outer walls of the mould petals are in close contact with the inner walls of the cylindrical parts. Therefore, the purpose of reducing or eliminating heat treatment deformation is achieved.

Description

technical field [0001] The invention relates to the deformation correction of cylindrical parts in the heat treatment production process of a three-lobed internal expansion mold. Especially the correction of deformation of thin-walled long cylindrical parts in the process of annealing and tempering belongs to the field of mechanical manufacturing. Background technique [0002] At present, in the field of heat treatment, cylindrical parts, especially thin-walled long cylindrical parts, are prone to deformation such as "shrinking" and "twisting" during the production process of heat treatment. In order to prevent or correct the deformation, hangers are generally used. This method can reduce the amount of deformation, but it is not ideal for thin-walled long cylindrical parts. In order to solve the above problems, a three-lobed internal expansion mold was invented. [0003] Disadvantages of traditional technology: [0004] The traditional way of "hoisting" furnace loading wi...

AI Technical Summary

Problems solved by technology

[0004] The traditional way of "hoisting" furnace loading with hanging fixtures is more effective in reducing the deformation of cylindrical parts with thick walls and short bodies, but it is relatively less effective than reducing the deformation of cylindrical parts with thin walls and long bodies. Not obvious, especially for parts that require high machining accuracy and cannot be mechanically corrected later

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