About hydraulic principle and processing contrast       

As an important part of mechanical equipment, we do not need to say more about the understanding of the hydraulic pump. The hydraulic pump is divided into many kinds, about its principle and processing is as follows:

Rolling process (Trundle processing)

Rolling process is a kind of machining without chip. Under the normal temperature, the micro deformation of the workpiece surface is rolled with the plastic deformation of the metal, so as to change the surface structure, mechanical characteristics, shape and size. Therefore, this method can achieve two purposes of finishing and strengthening at the same time, which can not be achieved by grinding.

No matter what processing processing method, leaving marks of the fine irregularities on the surface of parts will appear the phenomenon of peak valley cross rolling,

Rolling processing principle: it is a kind of pressure finishing, is characterized by the use of cold plastic metal at room temperature, using the rolling tool to put some pressure on the surface of the workpiece, the workpiece surface of metal plastic deformation, fill in the original residual indentation trough, and reach the surface roughness value reduction.

Because of the plastic deformation of the rolled surface metal, the cold hardening and grain refinement of the surface layer, the formation of dense fiber, and the formation of residual stress layer, the hardness and strength increased, thus improving the wear resistance, corrosion resistance and compatibility of the workpiece surface. Rolling is a non cutting plastic processing method.

No cutting technology is safe, convenient, and can accurately control the accuracy, several advantages:

1. improve the surface roughness, roughness can reach Ra or 0.08μ m.

2. correct roundness, ovality can be less than 0.01mm.

3. improve the surface hardness, the deformation is eliminated, the hardness increased more than 4 DEG HV

4. residual stress layer after processing, improve fatigue strength by 30%.

5. improve the quality of cooperation, reduce wear and tear, prolong the service life of parts, but the processing cost of parts is reduced.