秋葵app下载秋葵官网

Welcome to Zhejiang Shengtuo Machinery Co., Ltd.

News

News

Location:Home > News > Industry News
Requirements for Raw Materials of Cold Pier Machine
Release time:2019/6/21 17:22:12
Cold upsetting machine is continuously produced under heavy load and with high degree of automation, so cold pier machine has certain requirements for its raw materials.
1. The chemical composition and mechanical properties of raw materials for cold heading of cold pier machines should conform to relevant specifications.
2. It is necessary for the original data to be spheroidized annealed. The metallographic arrangement of the data is spherical pearlite grade 4-6.
3. The hardness of raw materials is generally required in HB110-170 (HRB62-88). In order to reduce the cracking tendency of the original material and increase the service life of the die, the hardness of the cold-drawn material should be as low as possible to further plasticity.
4. It is required that the total thickness of decarbonized layer in the direction of cold drawing radius should not exceed 1-1.5% of the original data diameter (the specific situation depends on the requirements of the manufacturers).
5. The precision of cold-drawn material should generally be determined according to the specific requirements of the product and the technological conditions. Generally speaking, the precision of shrinkage and shrinkage size is lower.
6. The exterior quality of cold-drawn material requires smooth film to be glossy and dark. There should be no scratches, folds, cracks, furring, rust, oxide scales and pits on the exterior.
7. In order to ensure the cutting quality during cold forming, it is required that the cold-drawn material has a hard appearance and a soft core.
8. Cold upset forging test should be carried out for cold-drawn materials. At the same time, the lower sensitivity of data to cold-work hardening is required, the better, so as to reduce the deformation resistance in the process of deformation due to cold-work hardening.

Mobile end

Copyright ? Zhejiang Shengtuo Machinery Co., Ltd. ALL Rights Reserveds.
Technical Support: