8 requirements for workpiece technology before the

2022-08-16
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8 requirements for workpiece technology before rolling processing

since rolling processing is a processing method using roller rolling, the surface roughness after processing is affected by the height and shape of the convex part (i.e. the state before processing)

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1 Surface before processing

as rolling processing is a processing method using roller rolling, the surface roughness after processing is affected by the height and shape of the convex part (i.e. the state before processing)

if the appearance is rough before processing (the convex part is high and the concave part is deep), the convex part cannot be completely buried in the concave part, resulting in rough processing appearance

in addition, the shape of the convex part also affects the appearance after processing. Regular concave 4-ball friction testing machine obtained by single point cutting of lathe or boring machine: the friction pair is composed of 4 steel balls in a convex shape, and the most ideal appearance can be obtained when it is easy to roll. The better the appearance condition before ordinary processing, the better the appearance condition after processing, and the less wear of the rolling head. If required, a process can be added

2. The problem we are facing now is the global dominance of China's manufacturing industry and the fact that many countries rely on one market to solve the waste and recycling problems. Rolling processing is a processing method using roller compaction, so the straight diameter of the workpiece will change before and after processing (the inner diameter will expand and the outer diameter will decrease). In order to be processed within the dimensional tolerance, this variation should be considered to determine the size of the previous process. The change of diameter is related to the material, hardness and rolling amount of the workpiece, so the size shall be determined after 2 ~ 3 trial machining

3. The standard models of driving machinery

rolling heads include Morse conical clamping part and parallel clamping part. Rolling processing is different from cutting processing. It does not need large torque. Small power machine tools can also be used. It can be installed on drilling machines, lathes, hexagonal lathes, boring machines, drillers and other equipment to stop processing, without special equipment

4. Smooth and clean

fine dust will be generated due to the roller rolling is used to stop the rolling process. Dust not only affects the appearance quality, but also accelerates the loss of rolling head, so it is necessary to inject a large amount of cutting fluid to eliminate dust. Cutting fluid with low viscosity should be used during rolling. Although the cutting fluid with high viscosity has good smoothness, it has poor cleaning performance and is not suitable for rolling processing

5. Processing local wall thickness

rolling processing is to use rollers to roll the surface of local parts to make them densified. Therefore, in order to accept the processing pressure, the part to be processed should have sufficient wall thickness (20% of the inner diameter). When the wall thickness is too thin or partially thin, there will be ups and downs or roundness drop after processing

this problem is usually handled in the following ways: ① reduce the rolling amount; ② Support the periphery with fixture; ③ Rolling processing shall be carried out before cutting thin-wall thickness

6. The upper limit of the workpiece hardness that can be processed by the rolling head is 40HRC, but the list of specially processed high hardness workpieces (the upper limit of hardness is 55HRC) includes two parts: 1. The rolling head used in the national catalogue of industries that encourage foreign investment. When rolling high hardness workpiece, the service life of the tool is shortened due to the high pressure on the processing part. Therefore, in order to obtain the machining surface with the required accuracy, the main measure is to reduce the rolling amount

7. Speed and feed rate

rotate the rolling head to the right to stop rolling processing; The rolling head can also be fixed, and the same result can be obtained by rotating the workpiece. The rotation speed and feed speed vary according to the machining diameter

8. Parts that cannot be rolled

when the rolling head is used to stop rolling the blind hole and step shaft, there are the following parts that cannot be machined: ① the arc part at the front end of the roller; ② The distance from the front end of the roller to the front end of the support; ③ The gap from the front end of the support to the local end face; In order to minimize the part that cannot stop rolling processing, after setting the tool diameter, grind off the spindle at the front end of the roller or keep the protrusion of the head at the same position as the front end of the roller

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