Traditional processing methods for cylinders?

The cylinder is the most important component in construction machinery. The traditional processing methods are: broaching the cylinder body – precision boring of the cylinder body – grinding the cylinder body. The rolling method involves: broaching the cylinder block – precision boring of the cylinder block – rolling of the cylinder block. There are 3 steps in this process, but in terms of time required, grinding 1 meter of cylinder block takes around 1-2 days, while rolling 1 meter of cylinder block takes approximately 10-30 minutes. Investment comparison: Grinding machines or honing machines (tens of thousands to millions), rolling tools (1 thousand to tens of thousands). After rolling, the surface roughness of the hole decreased from Ra 3.2–6.3 µm before rolling to Ra 0.4–0.8 µm, the surface hardness of the hole increased by about 30%, and the fatigue strength of the inner surface of the cylinder barrel increased by 25%. If only the cylinder barrel is considered in terms of the service life of the cylinder, it can be increased by 2 to 3 times; the broaching and rolling process is about 3 times more efficient than the grinding process. The above data show that the rolling process is efficient and can **improve the surface quality of the cylinder barrel. 　　After rolling, the cylinder surface has no sharp edges, and prolonged movement and friction do not damage the seals or gaskets, which is particularly important in the hydraulic industry.