Contact: Li Shijun (13940547998) with wechat
Contact: Li Ying (15502475265) with wechat
Tel: 024-25870279
Fax: 024-25870279
E-mail: 1412909433@qq.com
Postcode: 110025
Address: No.28-1, Zhenxing 7th Street, Hutai new town, Shenyang, Liaoning Province
Sales address: Gate 3, No. 32, Baogong North Street, Tiexi District, Shenyang City, Liaoning Province
website: en.sywhddy.com
1. Cause analysis of end shear bending:
When cutting low carbon steel, such as 20 ᦇ steel, 20CrMo, etc., it is easy to bend the end when cutting the end of low carbon steel. The length of the end of the bending saw is about 100 ~ 200 mm, the bending degree is more than 4 ‰, which exceeds the requirements of national standard. Straightening machine can straighten, only through the back of the second sawing processing, increasing the cost of subsequent treatment.
The corresponding solutions are as follows:
The end shear bending is mainly concentrated in low carbon steel low alloy structural steel, the main reason is that the end is bent downward due to shear impact force. Through many tests, the bar shear with lower support can effectively reduce the shear bending.
2. Cause analysis of end burr:
First of all, due to the large gap between the cutting blades of the bar cutting machine, the steel slips in the process of shearing, the tongue like burr is brought out the gap. Secondly, due to the influence of the bending of the rolled piece, the flattened metal volume accumulates along the longitudinal direction of the rolled piece at the shear edge, resulting in the separation tearing of the rolled piece the formation of burr. Third, in the process of shearing, the cutting edge of the shear slice is sharp enough, which makes the round steel shear end appear burr.
The corresponding solutions are as follows:
First of all, the gap between the upper lower blades should be scientifically reasonably controlled within 0.1 ~ 0.4mm. At the same time, the gap difference between the head tail of the blade should be less than equal to 0.2mm. Before using the bar shearing machine, once the gap value of the cutting blade does conform to the normal value range, it should be adjusted in time. The copper gasket can be added between the cutting edge the wear-resistant lining plate to compensate the cutting edge deviation, so as to make the gap between the head tail of the cutting edge consistent. Secondly, to ensure the integrity of the cutting edge, once the wear is found, it is necessary to replace new accessories in time.
