In die forging, roll forging, rolling and cold extrusion, temperature and other production batch of relatively large manufacturing sectors, the bar is the main raw material in the production of major equipment, bar cutting machine is ready for the billet forging process. Bar cutting machine is a kind of high production efficiency. Shearing equipment, general shear bar diameter is Phi 20mm Phi 200mm, for large diameter bar, every minute, more than a dozen pieces of shear, small diameter bar per minute to fifty or sixty. Shear 80mm diameter bar for example, sawing and cutting single time ratio about 1:20, the ratio of shear cutting material utilization rate can be increased by 15% ~ 20%. for carbon steel or low alloy steel in cold or hot state shear, are relatively easy to realize mechanization and automation. So the production efficiency and the utilization rate of materials etc. Compared with other cutting techniques, the bar shear has obvious economic effect.

The existing old bar shearing machine (see diagram on the next page 1 of physical equipment), the machine to buy in early 2002, purchase price of 24 million yuan, maximum shear diameter is 80mm, the bar shearing machine is a manufacturing enterprise is the main cutting equipment, mainly for the plant's forging workshop supplies diameter 32mm ~ Phi 80mm blank. Therefore, bar shearing machine in the production process of the plant plays a important role. The models in the purchase without initial with automatic cycle production function, and has been used for eight years, mainly exists the following problems.

1) roller transmission can not work normally, and with the increase of the length of the bar, has been unable to feed.

2) charging is not convenient, because there is no auxiliary facilities and material need frequent occupation of gantry crane, influences the other procedure, reduces the efficiency in the use of gantry crane.

3) because there is no automatic cycle operation function, the workers need frequent operation button, take up the manpower.

4 after shear without transfer with auxiliary, need to manually pick up material, occupation manpower and labor intensity is big.
In view of the above question, to "downsizing, lean management" as the direction, through the installation of electronic sensors and transmission belt auxiliary tool, we should realize mechanization and automation of the transformation of the old type of equipment to achieve, in order to reduce labor costs and improve the work efficiency of the equipment. The author participated in the the project, through the understanding and analysis of bar shearing machine working principle and now face problems, aiming at the improvement on the item by item of the specific issues.