Processing method of hydraulic cylinder
Release time:
2024-11-08
The processing method of hydraulic cylinder is a kind of pressure finishing, which uses the cold plasticity characteristics of metal at normal temperature, and uses rolling tools to apply certain pressure to the surface of the workpiece, so that the surface metal of the workpiece produces plastic flow, fills in the low concave valley of the original residue, and achieves the reduction of the roughness value of the surface of the workpiece.
The processing method of hydraulic cylinder is a kind of pressure finishing, which uses the cold plasticity characteristics of metal at normal temperature, and uses rolling tools to apply certain pressure to the surface of the workpiece, so that the surface metal of the workpiece produces plastic flow, fills in the low concave valley of the original residue, and achieves the reduction of the roughness value of the surface of the workpiece.
The rolling method is: broaching cylinder body-fine boring cylinder body-rolling cylinder body, the process is three parts, but the time comparison: grinding cylinder body 1 meter in about 1-2 days, rolling cylinder body 1 meter in about 10-30 minutes.
After the cylinder is rolled, its surface has no sharp tiny cutting edge, and it combines well with the sealing material, and the sealing effect is good, which is particularly important in the hydraulic industry. Long-term movement friction will not damage the sealing ring or seal.
The surface hardness of the hole is increased by about 30%, and the fatigue strength of the inner surface of the cylinder is increased by 25% after rolling with a grinding machine or a quilting machine and a rolling knife. The service life of the cylinder is increased by 2 to 3 times if only the influence of the cylinder is considered, and the efficiency of the boring rolling process is about 3 times higher than that of the grinding process. The above data shows that the rolling process is efficient and can greatly improve the surface quality of the cylinder.
Due to the plastic deformation of the rolled surface metal, the surface tissue is cold hardened and the grains become fine, forming a dense fiber shape, and forming a residual stress layer, which improves the hardness and strength, thereby improving the wear resistance, corrosion resistance and compatibility of the workpiece surface. Rolling is a non-cutting plastic processing method.
1. Improve the surface roughness, the roughness can basically reach Ra≤ 0.08 microns.
2. Correct roundness, ovality may be ≤ 0.01mm.
3. Improve the surface hardness, eliminate the force deformation, and increase the hardness HV≥ 4 °
4. After processing, there is a residual stress layer, which improves the fatigue strength by 30%.
5. Improve the quality of coordination, reduce wear, and extend the service life of parts, but the processing cost of parts is reduced.
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