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High speed milling method for thin-walled high-chord grooved cavity

A technology of high-speed milling and processing methods, applied in the field of milling processing, which can solve the problems of poor surface quality of parts, increase of processing costs, over-cutting and scrapping of parts, etc., and achieve the effect of stable processing, guaranteed processing, and small cutting force

Inactive Publication Date: 2019-08-06
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor rigidity of the thin-walled high-edge strip, it is easy to cause the knife to bounce during finishing machining, and the phenomenon of broaching will lead to poor surface quality of the part and even overcutting and scrapping of the part.
The above problems can be solved by reducing the milling parameters or adding some additional auxiliary process methods, but this reduces the processing efficiency or increases the processing cost

Method used

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  • High speed milling method for thin-walled high-chord grooved cavity
  • High speed milling method for thin-walled high-chord grooved cavity
  • High speed milling method for thin-walled high-chord grooved cavity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A high-speed milling method for thin-walled high-edge bar cavity, such as image 3 As shown, when semi-finishing the groove cavity, there is a stepped margin 5 on the side of the edge strip 1, and the stepped margin 5 increases sequentially from the top to the bottom of the edge strip 1; the stepped margin The inclination angle θ of 5 is 3-5°, and the inclination angle θ is the angle between the line connecting the center of the widest point and the narrowest point of the stepped margin 5 and the vertical direction.

[0031] The invention can not only ensure that the upper part of the edge strip 1 has less margin, small cutting width, and small cutting force during finishing machining, but also can ensure that the lower part has enough margin as a support to improve the rigidity of the parts. The present invention can prevent part deformation and processing chatter through the setting of the step-shaped margin 5, and at the same time ensure the processing efficiency, an...

Embodiment 2

[0033] This embodiment is optimized on the basis of Embodiment 1, and the stepped allowance 5 is generated by controlling the tool path. Semi-finishing edge 1 is followed by finishing edge 1. When finishing edge 1, the cutting width of milling is the same as the diameter d at the widest point of stepped allowance 5; when finishing edge 1, cutting edge 1 The cutting width of the upper part is smaller than the diameter d.

[0034] Due to the small margin on the upper part of the flange 1, the cutting width is small and the cutting force is small during milling, and the lower part of the flange 1 has sufficient margin for support, which can ensure a more stable machining process; when finishing the lower part of the flange 1, even if the cutting width is small Large, but the rigidity of the lower part of the edge strip 1 is better, which can ensure the stability of the processing process. The present invention can prevent part deformation and processing chatter through the setti...

Embodiment 3

[0037] This embodiment is optimized on the basis of embodiment 1 or 2, as figure 2 As shown, the following steps are also included before semi-finishing:

[0038] Step S100: Roughly machining the web 2 of the cavity, rough machining the side of the flange 1, and leaving an equal thickness margin 3 on the side;

[0039] Step S200: finishing the web 2 with a web allowance 4, and machining the side to the widest bottom of the margin 1 allowance.

[0040] The invention can not only ensure that the upper part of the edge strip 1 has less margin, small cutting width, and small cutting force during finishing machining, but also can ensure that the lower part has enough margin as a support to improve the rigidity of the parts. The present invention can prevent part deformation and processing chatter through the setting of the step-shaped margin 5, and at the same time ensure the processing efficiency, and has better practicability.

[0041] Other parts of this embodiment are the sa...

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Abstract

The invention discloses a high speed milling method for a thin-walled high-chord grooved cavity. Terraced allowances are reserved on the side face of a chord during semi-finishing of the grooved cavity, and increased from the top to the bottom of the chord in sequence; and the dip angle theta of the terraced allowances is 3-5 DEG, and the dip angle theta is the included angle between the line connecting the centers of the widest position and the narrowest position of the terraced allowances and the vertical direction. According to the high speed milling method, through arrangement of the terraced allowances, part deformation and machining chattering can be avoided, and meanwhile the machining efficiency is ensured; and the high speed milling method is higher in practicability.

Description

technical field [0001] The invention belongs to the technical field of milling, and in particular relates to a high-speed milling method for a thin-walled high-edge groove cavity. Background technique [0002] Many aircraft structural parts have deep cavity structures with thin walls and tall ribs. Due to the deep cavity, the high height of the edge, the thin wall, and the lack of surrounding connection support, the machining rigidity is poor and the machining process is unstable. In the process of high-speed CNC milling, the spindle speed of the machine tool is as high as 30,000 rpm. The higher spindle speed brings higher processing efficiency, but also increases the risk of vibration during processing. Due to the poor rigidity of the thin-walled high-edge strip, it is easy to cause the knife to bounce during finishing machining, and the phenomenon of broaching leads to poor surface quality of the part and even overcutting and scrapping of the part. The above problems can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23C3/00
CPCB23C3/00
Inventor 王元军夏文涵龚清洪杨玲牛印廖双权
Owner CHENGDU AIRCRAFT INDUSTRY GROUP