A method for manufacturing high-precision fine-grained cross-rolling rolls

Abstract

The invention discloses a design method for a high-precision fine grain groove diagonal rolling roller. The design method includes the following steps that S1, the sizes of a diagonal rolled piece and a rod material are designed, wherein the machining allowance and the thermal expansion effect are considered, and the rolling size of a part is calculated; and the diameter expansion effect in the forming process is considered, and the diameter of the rod material is determined; S2, basic parameters of the diagonal rolling roller are designed, wherein based on empirical data and relational expressions of an existing technology, the basic parameters of the roller are determined; S3, the height changing characteristics of the convex edge of the diagonal rolling roller are designed, wherein on the premise that it is guaranteed that the rolled piece is stably bitten in, design is performed based on the uniform deformation principle of harmony materials; and S4, the width changing characteristics of the convex edge of the diagonal rolling roller are designed, wherein design is performed based on the principle of adapting to the axial extension of a connection neck. By means of the design method, the height and the width of the convex edge of the diagonally-rolled groove type can be reasonably designed, it is facilitated that the deformation state of the rolled piece adapts to the groove type, the harmony materials uniformly deform, and the better forming precision and grain refinement degree are acquired.

Description

technical field [0001] The invention belongs to the technical field of rotary plastic processing, and in particular relates to a method for manufacturing a high-precision fine-grain pass cross-rolling roll, which is used to improve the forming accuracy and crystal grain fineness of spiral-pass cross-rolling of rotary parts such as spherical, cylindrical or conical parts. degree of transformation. Background technique [0002] Spiral pass cross rolling process (referred to as cross rolling) is an advanced rotary plastic forming technology for spherical, cylindrical, conical and other rotary parts. Compared with traditional forging, casting and turning processes, it has high quality, energy saving, material saving, It has obvious advantages such as high efficiency, and is widely used in the forming and manufacturing of rotating parts such as ball milling steel balls, bearing steel balls and rollers. In the spiral pass cross rolling process, reasonable roll pass design is the ...

AI Technical Summary

Problems solved by technology

In the traditional cross-rolling roll pass design method, the change characteristics of the rib height are limited by the processing technology of the roll, which is usually simplified as a linear change design, while the change characteristics of the rib width are selected based on empirical data. None of them are reasonably designed in combination with the deformation characteristics and metal flow laws in the skew rolling process.

In addition, the traditional method of preliminary selection and design of rib width based on empirical data requires repeated checks and correction calculations, resulting in low design efficiency

It can be seen that the pass design methods of cross rolling rolls at this stage are mostly based on traditional experience, and the design is cumbersome and inefficient. At the same time, the deformation characteristics and metal flow characteristics of the cross rolling process are not effectively combined, and it is difficult to achieve high precision and high performance cross rolling parts. production

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