Machining method used for thin-wall cavity type magnesium-lithium alloy part

A magnesium-lithium alloy and mechanical processing technology, which is applied in the field of mechanical processing of magnesium-lithium alloy parts, to achieve the effects of avoiding accidents, ensuring chip removal, and improving safety performance

Active Publication Date: 2016-05-04
XIAN NORTH ELECTRO OPTIC TECH DEFENSE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of this invention is to provide a kind of machining method for thin-walled cavity-type magnesium-lithium alloy parts, which can solve the safety and quality problems occurring in the machining process of thin-walled cavity-type magnesium-lithium alloy parts, and can improve magnesium Lithium Alloy Corrosion Resistance

Method used

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  • Machining method used for thin-wall cavity type magnesium-lithium alloy part
  • Machining method used for thin-wall cavity type magnesium-lithium alloy part

Examples

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Effect test

Embodiment 1

[0029] A machining method for thin-walled cavity-type magnesium-lithium alloy parts at least includes the following steps:

[0030] 1) Unload the bar;

[0031] 2) Car outer circle, drill, car deep hole;

[0032] 3) The shape of rough milled parts, leaving a margin of 2mm on one side;

[0033] 4) According to the requirements of the parts, the deep holes of step 2) are counted and milled;

[0034] 5) Heat the parts, first clean the parts with gasoline and place them in the air to dry thoroughly to ensure that there are no chips on the surface of the parts. Heat the parts in a constant temperature box to a temperature of 90°C for 3 hours, and then air-cool to room temperature;

[0035] 6) Semi-finish milling of the surface of the part, leave a fine milling allowance of 1mm on one side, and ensure that the vertical planes of the parts are perpendicular to each other at 0.05mm;

[0036] 7) Perform cryogenic treatment on the parts, clean up the small or dusty chips on the parts before installi...

Embodiment 2

[0041] A machining method for thin-walled cavity type magnesium-lithium alloy parts includes the following steps:

[0042] 1) Unload the bar;

[0043] 2) Turn the outer circle, drill and turn deep holes; during turning, the speed of the machine tool should be less than 400r / min, and the feed rate should be greater than 0.5mm; the material of the turning tool is cemented carbide or high-speed steel tool, and the back angle of the turning tool α=12~15°, rake angle γ=8~12°; when drilling deep holes, use a drill bit smaller than φ20mm for processing, withdraw the tool in time after each drilling depth of 2mm, and clean the cutting chips of the drill bit and feed again to avoid When drilling deep holes, it is easy to cause magnesium chips to accumulate and cause fire; during turning, use mineral oil coolant to cool down, and the cutting oil should have a low viscosity. To prevent corrosion of magnesium alloys, the free acid content of mineral oil should be less than 0.2% ;

[0044] 3) T...

Embodiment 3

[0058] Take machining parts as an example, the material is magnesium-lithium alloy, and the part structure is as figure 1 and figure 2 As shown, the external dimension of the part is 39mm, the height of the part is 39mm, the length of the part 6 is 69mm, the width of the part 11 is 45mm, the peripheral wall thickness 4 is only 2.5mm, the bottom thickness 5 is 2mm, the end face has a gap 2 and the part bottom has 1 The diameter of the large holes 9 is Φ24mm, the size of 4 small holes 8 on the bosses 10 is Φ3mm×30mm (depth), the size of 2 threaded holes on the bosses 7 is M2-6H (through hole) .

[0059] From the analysis of the part structure, the part has a relatively large external size, the peripheral wall thickness is only 2.5mm, and the bottom thickness is 2mm. It is a typical thin-walled cavity part with poor structural rigidity and easy deformation; the ratio of the diameter of 4 small holes to the depth of the hole 10, it is a slender hole, it is easy to accumulate magnes...

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Abstract

The invention relates to a machining method used for a thin-wall cavity type magnesium-lithium alloy part. The machining method comprises at least the following steps that (1) bar blanking is conducted; (2) outer circle turning is conducted, and a deep hole is drilled and turned; (3) rough milling is conducted on the part shape, and a 2 mm unilateral allowance is reserved; (4) according to part requirements, the deep hole in the step (2) is numerically milled to form a mold cavity; (5) the part is subjected to heat treatment, firstly, the part is washed to be clean through gasoline and placed in air to be aired thoroughly, the effect that no cuttings are on the surface of the part is ensured, and after the part is heated to 90 DEG C and heat preservation is conducted for 3 h in a thermotank, air cooling is conducted to the room temperature; (6) half-finish-milling is conducted on the part surface; (7) subzero treatment is conducted on the part, small fragmental or pulverized cuttings on the part are cleared away before furnace charging, then the part is put into a refrigeration box to be subjected to heat preservation for 5-6 h in -195 DEG C liquid nitrogen, and air cooling is conducted to the room temperature; (8) finish-milling is conducted on the part surface according to the edge distance size requirement of the part surface; and (9) finishing is conducted. Through the machining method, safety and high-quality during machining of the thin-wall cavity type magnesium-lithium alloy part are achieved, and the anti-corrosion capacity is improved.

Description

Technical field [0001] The invention relates to a mechanical processing method, in particular to a mechanical processing method for thin-wall cavity type magnesium-lithium alloy parts. Involved in the field of machining of magnesium-lithium alloy parts. Background technique [0002] "Magnesium alloy application and industrialization" is a key development project in the national "Eleventh Five-Year Plan". Magnesium is one of the most abundant elements on the earth and has many excellent properties. The density of magnesium alloy is 1.8g / cm3, which is 36% lighter than aluminum alloy, 73% lighter than zinc alloy, and 77% lighter than steel. It is the lightest structural metal material among practical metals. Under the same strength, magnesium alloy Its parts can be made lighter and thinner than plastic and aluminum parts; the cutting resistance of magnesium alloy is lower than that of other metals, and its cutting resistance is 0. 56. Brass is 0.43 and cast iron is 0.29, so it ca...

Claims

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Application Information

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IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 程会民李时威张勇刘沛白楠杨永娟
Owner XIAN NORTH ELECTRO OPTIC TECH DEFENSE
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