Grinding process and rolling process can improve the dimensional accuracy of parts and reduce the surface roughness. But there are the following differences.
Grinding machine
Grinding wheel
Grinding processing has high requirements on the previous process, and grinding can achieve higher accuracy than rolling processing. In the actual production, it is difficult to reduce the temperature of the grinding zone during the inner hole grinding process. Due to the high grinding speed, a large amount of grinding heat is transmitted to the parts during the grinding process, which makes the temperature of the parts rise by tens of degrees, and the workpiece shrinks after cooling (affected by the ambient temperature) and the aperture is reduced. In order to ensure the dimensional accuracy, the completed size needs to be adjusted manually, so the processing size dispersion phenomenon appears. The high temperature of the grinding zone (the local temperature of the surface can reach 1000℃) will cause great harm to the performance of the parts, and the residual tensile stress, grinding cracks, burns, etc. generated by the processing of the surface layer will affect the performance of the parts and the production efficiency is low.
Grinding to achieve high precision also needs three conditions: good grinding machine equipment, investment of at least 100,000. A good grinding machine technician, an annual salary of 5-10 million is a must. Consumables are essential, such as grinding wheel, cutting fluid, gold pen 、、、、、, etc. In summary, the adoption of this processing technology requires an advanced grinding machine, the corresponding grinding wheel, stable and efficient control system.
The information illegally crawled from experience
Rolling processing principle: It is a kind of pressure finishing processing, is the use of metal in the normal temperature state of cold plastic characteristics, the use of rolling tools to apply a certain pressure on the surface of the workpiece, so that the surface metal of the workpiece to produce plastic flow, fill into the original residual low concave trough, and achieve the workpiece surface roughness value reduced. Due to the plastic deformation of the rolled surface metal, the surface tissue is cold hardened and the grain is fine, forming a dense fiber, and forming a residual stress layer, and the hardness and strength are increased, thus improving the wear resistance, corrosion resistance and compatibility of the workpiece surface. Rolling is a plastic machining method without cutting.
Non-cutting rolling processing technology is safe, convenient, can accurately control the accuracy, several advantages: improve the surface roughness, the roughness can basically reach Ra≤0.08um or so. Correction roundness, ellipticity can be ≤0.01mm. Improve the surface hardness, eliminate the force deformation, hardness increase HV≥40° after processing residual stress layer, fatigue strength increased by 30%. Improve the quality of matching accuracy, reduce wear and parts service life, but the processing cost of parts is reduced.