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Wet hard turning process of steel part after quenching heat treatment

A cutting method and part technology, applied in the direction of turning equipment, turning equipment, metal processing machinery parts, etc., can solve the problem of improving tool life without improvement, and achieve the effect of prolonging the service life

Inactive Publication Date: 2008-06-04
SHANGHAI AUTOMOBILE GEAR WORKS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The processing method of this patent can only be used for inner diameter processing, and there is no improvement in the life of the tool

Method used

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  • Wet hard turning process of steel part after quenching heat treatment
  • Wet hard turning process of steel part after quenching heat treatment
  • Wet hard turning process of steel part after quenching heat treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 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.

[0022] 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 (0.10-0.20mm 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 The angle between the edge and the horizontal line ...

Embodiment 2

[0026] The original number of forced tool changes (one-sided cutter head) was 250. When the 250th part was processed, Ra≥0.45μm was measured. The cutter head was enlarged to show that the arc of the cutter tip was worn, and the cutter head was considered scrap .

[0027] The improvement method is to extend the number of forced tool changes, keep all other cutting conditions unchanged, and after crossing the "false scrap" area, the surface roughness of the part is obviously improved. Enlarging the cutter head shows that the arc of the cutter nose is formed again, and the surface roughness of the part formed after crossing the "false scrap" area is often the best, which is also in full agreement with Figure 3. Finally, the number of forced tool changes (one-sided cutter heads) was extended to 470. The Ra value of the surface roughness of the parts is shown in the table below:

[0028]

[0029]

Embodiment 3

[0031]Increase the cutting speed from the original 90m / min to 400m / min. After small batch production, the number of forced tool changes (single-sided cutter heads) can be extended to 500. There is no obvious difference between the measured surface roughness of the part and the surface roughness of the part formed when the original cutting speed is 90m / min.

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Abstract

The present invention belongs to the field of machining technology. The wet hard turning process of steel part after quenching heat treatment includes the following steps: 1. setting cutter, inputting cutting parameters including cutter zero point and compensation amount, raising the main shaft speed of the lathe to 300-700 m / min and maintaining the feeding rate of 0.02 mm / r; 2. loading the part into the turning fixture and closing the door of the lathe; 3. spraying cooling liquid to the cutter and turning the part; 4. cutting the conic surface until reaching surface smoothness; and 5. polishing. The present invention has raised turning speed and turning efficiency.

Description

technical field [0001] The invention relates to a cutting method, in particular to a cutting method for wet hard turning of steel parts after quenching heat treatment, and belongs to the technical field of mechanical processing. Background technique [0002] Hard turning refers to the turning of hardened parts (55-65 HRC) using high-performance turning tools, which is usually a finishing process. With traditional wet cutting, due to the continuous cooling of the coolant, the metal material of the part cannot be softened due to the high temperature in the cutting area. In theory, this is not good for the life of the tool and the lubrication of the cutting area, but in practical applications , it is confirmed that the lubrication of the coolant is better than that without cooling to obtain the high temperature lubrication in the cutting area, that is to say, it is beneficial to use the coolant for wet cutting from the analysis of the surface roughness of the part, but in the w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23B1/00B23B5/38B23Q15/00B23Q11/10B23Q17/20
Inventor 郑天翼
Owner SHANGHAI AUTOMOBILE GEAR WORKS
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