Cutting method for dry state hard turning steel part after chilling thermal treatment
A cutting method and part technology, applied in turning equipment, turning equipment, metal processing machinery parts, etc., can solve the problems of not raising the surface roughness of parts, not being applicable, and not improving the processing cycle, so as to improve the surface roughness and prolong the The effect of lifespan and number extension
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0023] The projections of the new and old cutter heads are enlarged, and the phenomenon of "false scrapping" in the process of processing is analyzed by using the principle of thermoplastic flow and combining the measurement data of the surface roughness of the parts.
[0024] Figure 2a , Figure 2b The enlarged projection of the cutter head, the right edge of the cutter head is the rake face. Figure 2a is a projected enlarged view of the new cutter head. from Figure 2b It can be seen that the negative rake angle appears on the rake face, which is formed by the part hitting the rake face of the cutter head during the cutting process, and the new blade does not have it. The angle θ between the original negative chamfer of the new blade head (0.10mm due to the small cutting depth, which can be regarded as a negative rake angle) and the horizontal line, after cutting 360 parts, the tool wears, and the negative chamfer and The angle between the horizontal lines becomes smal...
Embodiment 2
[0028] The original number of forced tool changes (unilateral cutter head) was 200. When the 200th part was processed, Ra≥0.8μm was measured. The cutter head was enlarged to show that the arc of the cutter tip had been worn, and the cutter head was considered completely scrapped.
[0029] The improvement method is to prolong the forced tool change time, and keep all other cutting conditions unchanged. After crossing the "false scrap" area, the surface roughness of the part is obviously improved. Enlarging the tool head shows that the arc of the tool tip is formed again, and the surface roughness of the part formed after crossing the "false scrap" area is often the best. In the end, the number of forced tool changes (unilateral cutter heads) was extended to 320.
Embodiment 3
[0031] Increase the cutting speed from the original 90m / min to 400m / min, and extend the number of forced tool changes (unilateral cutter heads) to 360. The Ra value of the surface roughness of the parts is shown in the table below:
[0032] 15#
[0033] It is required that Ra=0.30~0.45μm, it can be seen that the effectiveness of the actual dry hard turning is inferior to the surface roughness of the parts that should be achieved by the theoretically required hard turning process. But if these parts are polished, we found that all the surface roughness is up to standard, see the table below:
[0034] 15#
[0035] After polishing, Ra=0.15~0.30μm is required, and the measured surface roughness of the parts all meet the standard. That is to say, it is completely feasible to reduce the surface roughness of the parts to the standard of dry hard car.
PUM
| Property | Measurement | Unit |
|---|---|---|
| surface roughness | aaaaa | aaaaa |
| hardness | aaaaa | aaaaa |
| hardness | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More