The shearing machine can be divided into two types: mechanical and hydraulic.

 The principle of mechanical punch is roughly the same, but too much driness, no overload capacity, too much trouble to adjust the clearance... Has been phased out.

 Hydraulic plate shears are divided into pendulum type and brake type. Because the pendulum shearing machine is the circular arc motion, and the circular arc blade manufacture is quite difficult, generally is to use the blade after the cushion iron compensation, so the clearance is not accurate, cut out the sheet material is not very ideal. Because is the arc movement, the blade can not be made into a rectangle, but should be made into an acute Angle, so the blade stress is not ideal, the blade damage is more severe. The domestic representatives of pendulum shearing machine are Tianshui machine tool factory and Shanghai Punching and shearing machine tool factory. Brake type hydraulic plate shears overcome all the above problems. But at present domestic manufacturers can do brake type plate shears are not many, mainly on behalf of Huangshi, Wuxi Golden ball, Shenchong, Yang2 forging introduced Belgium LVD plate shears.

 Relative to shearing machine, bending machine technology content to slightly higher. Speaking of bending machine industry insiders will certainly think of Little Japan AMAD~ domestic Yellowstone. It is said that there have been mechanical bending machines, but I was born too late to see them. I know only the hydraulic, so I said in the hydraulic bending machine, the current domestic common G shape and F, F shape should be domestic traditional product, its use is built-in adjustable mechanical stop positioning, because it is built-in the partial load resistance is weak, so have the Yellowstone in early bending machine equipped with balance valve, but also because of the complex hydraulic system brings to the late maintenance and stability is very serious problem. The latter type is the G type after the f-type model is improved, and it adopts the external sliding plate mechanical positioning, which is simpler in structure and more convenient in debugging than the F-type. Even in the case of the Angle difference between the two sides, it can also be solved by the non-professional people adding gaskets.

 Now there is also a h-type bending machine, its structure is very different from the previous two, it is a lever structure, generally used for large tonnage bending machine, through the lever amplification principle, the force amplification. At the same time, it adopts the position control combining electricity, liquid and number, which makes it especially cost-effective on the same tonnage bending machine. But it is a pity that there are not many domestic manufacturers who can produce this kind of model, and the people who know this kind of model are even less. As far as I know, there is only one ACCURPRESS company in Canada and one machine tool company that is not well-known in China, which has good quality. Even one company I know actually returned a 320T 4-meter-long bending machine produced by ACCURPRESS to six meters without the ACCURPRESS's knowledge, and the folded pieces are quite good.