Since the rolling process is a method of applying roller compaction, the surface roughness after machining is affected by the height and shape of the protrusion (ie, the state before processing).
1. Before processing
Since the rolling process is a method of applying roller compaction, the surface roughness after machining is affected by the height and shape of the protrusion (ie, the state before processing).
If the surface condition is rough before processing (the convex part is high and the concave part is deep), the convex part cannot be completely buried and partially recessed to form a rough surface.
In addition, the shape of the convex portion also affects the appearance after processing. The ideal appearance of the irregular shape obtained by cutting the lathe or the sheet of the sheet, and the height that is easy to be rolled, can obtain the most ideal appearance. The better the appearance before the ordinary processing, the better the appearance after processing, and the less wear of the rolling head. If demand is required, an additional process can be added.
2. Pre-machining size
Since the rolling process is a method of applying roller compaction, the diameter of the workpiece will change before and after machining (the inner diameter will expand and the outer diameter will decrease). In order to be able to process to within the dimensional tolerances, the size of the pre-reform process should be considered. Since the amount of change in diameter is related to the material, hardness, and rolling amount of the workpiece, the size is determined by first stopping the test after 2 to 3 trials.
3. Drive machinery
Roller head specification models include the Morse cone mounting section and the parallel mounting section. Rolling processing is different from cutting processing. It does not require high torque. Small-power machine tools can also be used. It can be installed on drilling machines, lathes, turret lathes, boring machines, drills and other equipment without special equipment.
4. Smooth and clean
Since the rolling process is performed by roller compaction, fine dust is generated. Dust not only affects the appearance quality, but also accelerates the loss of the rolling head, so it is necessary to inject a large amount of cutting fluid to eliminate the dust. Use a low viscosity cutting fluid for rolling. The cutting fluid with high viscosity is good in smoothness, but the cleaning performance is poor, and it is not suitable for rolling processing.
[NT:PAGE]5. Processing local wall thickness
Rolling is performed by rolling the surface of the roller to make it dense. Therefore, in order to be able to accept the processing pressure, the part to be processed should have a sufficient wall thickness (20% of the inner diameter). When the wall thickness is too thin or partially thin, the undulation or roundness will fall after processing.
This problem is usually dealt with as follows: 1 reducing the amount of rolling; 2 applying the clamp to support the outer circumference; 3 performing rolling processing before thinning the wall thickness.
6. Processing local hardness
The upper limit of the hardness of the workpiece that can be machined by the rolling head is 40HRC, but the rolling head for high-hardness workpieces (the upper limit of hardness is 55HRC) is also specially manufactured. When rolling a high-hardness workpiece, the machining life is shortened due to the large pressure received. Therefore, in order to obtain the processing surface of the required precision, the main measure is to reduce the amount of rolling.
7. Speed ​​and feed rate
Rotate the roller head to the right to stop the rolling process; the roller head can also be fixed, and the same result can be obtained by rotating the workpiece. The speed and feed rate vary depending on the machining diameter.
8. Can not roll the processed part
When the blind head and the step shaft are stopped by the rolling head, there are the following parts that cannot be processed: 1 part of the front end of the roller; 2 the spacing of the front end of the roller to the front end of the bracket; 3 the gap between the front end of the bracket and the end surface of the processing In order to minimize the local part of the rolling process, after the tool diameter is fixed, the mandrel at the front end of the roller will be ground or the amount of protrusion of the head will be in the same position as the front end of the roller.
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Tag: cutting fluid, drill, blind hole, high torque, workpiece
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