+86-311-85612775

+86-311-85329078

info@ypmachinery.com

 2-201,Fangda Tech Park ,No.266 Tianshan Street, Shijiazhuang

City,Hebei Province, China

 

Hebei Yunpeng Machinery is a leading enterprise

whose metal parts and duct fittings production.

CONTACT US

COPYRIGHT © 2018 Hebei Yunpeng Machinery Co., Ltd.
 
>
>
>
Problems to be paid attention to in the processing of Pressed ventilation elbow
Company news
Industry news
web is updating and upgrading
Exhibition
Exhibition

Problems to be paid attention to in the processing of Pressed ventilation elbow

When the Pressed ventilation elbow is processed, it is usually carried out at room temperature. The cold drawing produces plastic deformation and then increases the yield strength. This process is called cold drawing strengthening. The principle of pressed ventilation elbow in the process of cold drawing strengthening is that the defects of the lattice of the elbow increase during the plastic deformation, and the severe deformation of the lattice of the defect will hinder the further slippage of the lattice when the elbow is pushed. The quality and service life of the elbow increase the yield point of the elbow, and the plasticity and toughness decrease. Because of the internal stress generated in the plastic deformation, the elastic modulus of the elbow decreases.

Pressed ventilation elbow

At this time, the cold-drawn steel bars are stored at room temperature for 15-20d or heated to 100-200°C and kept for a certain period of time. This process is called aging treatment. After the aging treatment of the pressed ventilation elbow after cold drawing, the yield point is further improved, the ultimate tensile strength also increases, and the plasticity continues to decline. Due to the reduction of internal stress during the aging process, the elastic modulus can be basically recovered.

It is very important to grasp the stress of the Pressed ventilation elbow. After cold drawing, the push elbow is used as a prestressed steel bar, and the cold drawing stress should be used to dominate. However, after the cold drawing of the steel bar, it is found that the cold drawing rate exceeds the standard value, and the machine can perform it again. The cold drawing rate of the pressed ventilation elbow is also important to determine the operational control.