Reducing spinning method for controlling shape precision of straight cylinder piece

Abstract

The invention discloses a reducing spinning method for controlling the shape precision of a straight cylinder piece, and belongs to the field of plastic forming machining. According to the method, firstly, the spinning expanding amount is introduced during die design, and then a special spinning die is adopted for spinning, heat treatment, spinning, heat treatment and spinning in sequence; by setting the spinning expanding amount delta, the machining forming precision of a straight cylinder is improved by 15% or above, and meanwhile it is guaranteed that the machining efficiency is improved by50%; and three times of spinning and two times of heat treatment are conducted alternately, meanwhile, the feeding ratio of the last spinning is controlled to range from 0.8mm / r to 1.3mm / r, the thinning rate of the last spinning is controlled to range from 30% to 40%, and therefore high-precision spinning can be realized.

Description

technical field [0001] The invention belongs to the field of plastic forming processing, and in particular relates to a diameter-reducing spinning method for controlling the shape accuracy of a straight cylindrical part. Background technique [0002] Thin wall and weak rigidity are the structural characteristics of straight cylindrical spinning parts, followed by preventive and corrective measures to control processing deformation in the production and manufacturing process around shape accuracy and quality problems, so as to achieve high-precision manufacturing goals. [0003] In the field of spinning manufacturing, the roundness and straightness precision control of thin-walled cylindrical parts has always been the key focus of engineers and technicians, and it is also a key factor affecting high-quality manufacturing of products. under figure 1 It is a structural representation of straight cylindrical spinning parts including the accuracy requirements of straightness a1 ...

AI Technical Summary

Problems solved by technology

[0008] The basis for the control of cylindrical spinning shape accuracy is lost because there is no process plan for the control target of spinning diameter expansion

[0009] ⑵Under the premise of not formulating the diameter expansion amount of spinning, there is blindness in the diameter design of the cylindrical spinning die. Once the design value of the die diameter is too small, in order to achieve the accuracy of the cylindrical diameter φD (or φd) during the implementation of the spinning process The control will inevitably bring about a large amount of diameter expansion. The actual performance is that the diameter expansion is greater than 0.6mm, and some products even reach more than 1.0mm, which directly causes the shape accuracy to be out of tolerance.

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