Numerical control milling process method of thin-walled part die cavity

A technology of thin-walled parts and CNC milling, which is applied to metal processing equipment, milling cutters, milling machine equipment, etc., can solve problems such as reduced work efficiency, poor part size consistency, and out-of-tolerance dimensions, so as to improve part processing efficiency and improve product quality. The effect of improving quality and processing efficiency

Inactive Publication Date: 2010-07-21
AVIC HUIYANG AVIATION PROPELLER
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The processing method of the special cavity of thin-walled parts is initially processed by ordinary milling machine and high-speed steel milling cutter. The processing process is forging - rough turning - heat treatment - semi-finishing turning - grinding outer circle - turning thread - milling end groove - milling Cavity..., considering the hole positioning of thin-walled parts, the cavity milling process can only be arranged after the outer circle is finished. Since it is a thin-walled part, the minimum wall thickness is 3.5mm, and the cavity processing depth is 0.75mm ~0.85mm, the smaller the depth of the cavity, the greater the amount of tool clearance in the cavity during processing, and the smaller the deformation caused by cutting resistance. When the processing depth is 0.75mm, the deformation of the outer circle is 0.05mm, and the tool clearance of the cavity The amount is 0.25mm. When the processing depth is 0.85mm, the deformation of the outer circle is 0.08mm, and the tool allowance of the cavity is 0.15mm. This will cause the outer circle and other matching surfaces to be out of tolerance or scrapped, and the dimensional consistency of the processed parts is poor. Roughness is not easy to guarantee
Then adopt wire cutting special processing, the size consistency and surface quality of the processed parts are guaranteed, but other mating surfaces are out of tolerance due to deformation or scrapped, in order to avoid deformation of other mating surfaces, the feed rate of molybdenum wire is reduced, corresponding work efficiency is greatly reduced

Method used

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Examples

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Effect test

Embodiment 1

[0011] see figure 1 , the material of the thin-walled part is 40CrNiMoA, the diameter of the outer cylinder of the thin-walled part is 156mm, the length is 170mm, the roughness Ra=1.6μm, the radius of the inner hole is 55mm, the generatrix is ​​formed by tangent to the curved surface of the arc, and the minimum wall thickness is 3.5mm, the two cavities to be processed are symmetrical grooves on the inner hole of the thin-walled part, the radius of the cavity is 55.75mm, and a concave arc with a diameter of 32mm and a diameter of 10mm There are four convex arcs connected tangentially, and the concave arcs and convex arcs are also connected tangentially. The cavity length is 160 mm and the roughness Ra is 3.2 μm. It is processed by XK716 powerful CNC milling machine, and the thin-walled parts are positioned and clamped by the outer cylinder of the thin-walled parts. Since the arc diameter of the smallest groove of the thin-walled part cavity is 32mm, the inserting blade with a d...

Embodiment 2

[0013] see figure 1 , the material of the thin-walled part is 40CrNiMoA, the diameter of the outer cylinder of the thin-walled part is 156mm, the length is 170mm, the roughness Ra=1.6μm, the radius of the inner hole is 55mm, the generatrix is ​​formed by tangent to the curved surface of the arc, and the minimum wall thickness is 3.5mm, the two cavities to be processed are symmetrical grooves on the inner hole of the thin-walled part, the radius of the cavity is 55.75mm, and a concave arc with a diameter of 32mm and a diameter of 10mm There are four convex arcs connected tangentially, and the concave arcs and convex arcs are also connected tangentially. The cavity length is 160 mm and the roughness Ra is 3.2 μm. It is processed by XK716 powerful CNC milling machine, and the thin-walled parts are positioned and clamped by the outer cylinder of the thin-walled parts. Since the arc diameter of the smallest groove of the thin-walled part cavity is 32mm, the inserting blade with a d...

Embodiment 3

[0015] see figure 1 , the material of the thin-walled part is 40CrNiMoA, the diameter of the outer cylinder of the thin-walled part is 156mm, the length is 170mm, the roughness Ra=1.6μm, the radius of the inner hole is 55mm, the generatrix is ​​formed by tangent to the curved surface of the arc, and the minimum wall thickness is 3.5mm, the two cavities to be processed are symmetrical grooves on the inner hole of the thin-walled part, the radius of the cavity is 55.75mm, and a concave arc with a diameter of 32mm and a diameter of 10mm There are four convex arcs connected tangentially, and the concave arcs and convex arcs are also connected tangentially. The cavity length is 160 mm and the roughness Ra is 3.2 μm. It is processed by XK716 powerful CNC milling machine, and the thin-walled parts are positioned and clamped by the outer cylinder of the thin-walled parts. Since the arc diameter of the smallest groove of the thin-walled part cavity is 32mm, the inserting blade with a d...

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Abstract

The invention belongs to the numerical control process technology and relates to an improvement to the numerical control milling process method of the thin-walled part die cavity. The method comprises the following steps: installing and clamping an thin-walled part, selecting a mechanical clamped cutter and an end milling cutter, measuring parameter, selecting a programming origin and cutting parameters, determining the cutter position of the mechanical clamped cutter, measuring the length difference of the end milling cutter and the mechanical clamped cutter, roughing a insert bit mechanically-clamped numerical control milling cutter, finishing a high-speed steel end milling cutter, etc. The invention is characterized in that the cutting parameters are as follows: the cutting depth of the mechanical clamped cutter is 0.4-0.6mm, the cutting depth of the end milling cutter is equal to the depth of the thin-walled part die cavity; the cutting speed of the mechanical clamped cutter is 1500-2500rpm, the cutting speed of the end milling cutter is 400-600rpm; and the feeding amount of the mechanical clamped cutter is 700-1200mm/min, and the feeding amount of the end milling cutter is 300-500mm/min. The numerical control milling process method of the invention has high working efficiency, and can ensure the working size precision of the thin-walled part, obtain lower surface roughness, eliminate size distortion of the part and increase the product quality.

Description

technical field [0001] The invention belongs to the numerical control processing technology and relates to the improvement of the numerical control milling process method for the cavity of thin-walled parts. Background technique [0002] The processing method of the special cavity of thin-walled parts is initially processed by ordinary milling machine and high-speed steel milling cutter. The processing process is forging - rough turning - heat treatment - semi-finishing turning - grinding outer circle - turning thread - milling end groove - milling Cavity..., considering the hole positioning of thin-walled parts, the cavity milling process can only be arranged after the outer circle is finished. Since it is a thin-walled part, the minimum wall thickness is 3.5mm, and the cavity processing depth is 0.75mm ~0.85mm, the smaller the depth of the cavity, the greater the amount of tool clearance in the cavity during processing, and the smaller the deformation caused by cutting res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23C3/00B23C5/02
Inventor 李国平郭姗娜
Owner AVIC HUIYANG AVIATION PROPELLER
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