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A Design Method of Shrinkage Ratio for Precision Casting Mold with Multi-blade Guide Vanes

A design method and technology of shrinkage rate, applied in the direction of casting molding equipment, casting mold, casting mold composition, etc., can solve the problem of over-tolerance of channel area of ​​multi-leaf group blade castings

Active Publication Date: 2016-06-22
AECC AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems referred to above, provide a kind of shrinkage rate design method of multi-leaf group guide vane precision casting mold, when adopting this method to design and manufacture wax pattern mould, in the L, D, R of size difference greatly disparity (see hypothetical Shrinkage direction) Set corresponding shrinkage rates in three directions, which solves the problem of out-of-tolerance channel area of ​​multi-leaf guide vane castings caused by only using a single shrinkage rate in the past

Method used

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  • A Design Method of Shrinkage Ratio for Precision Casting Mold with Multi-blade Guide Vanes
  • A Design Method of Shrinkage Ratio for Precision Casting Mold with Multi-blade Guide Vanes
  • A Design Method of Shrinkage Ratio for Precision Casting Mold with Multi-blade Guide Vanes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] Example 1: Five-stage guide vanes in five-blade group

[0097] (1) Contour size of the guide vane of a certain five-blade group:

[0098] Arc length of upper edge plate L 2 It is about 140mm, the arc length L1 of the lower edge plate is about 90mm, the width D of the upper and lower edge plates is about 30mm-40mm, and the blade body length L=R 2 -R 1 It is about 220mm, and the total radian of the blade group is 4α=16.3636°.

[0099] (2) Select the shrinkage size

[0100] According to the characteristics of the on-site wax material in the actual production process, the shrinkage rate of the casting mold with a dimension length of 90mm-140mm is 2.1%, the length is 30mm-40mm, 2%, and the length is 220mm, 2.4%.

[0101] That is, ψ 1 = 2.4%, ψ 2 = ψ 3 = 2.1%, ψ 4 = 2%.

[0102] (3) Mold shrinkage design

[0103] In the D direction: 2% enlargement in the width direction of the upper and lower edge plates.

[0104] In the R direction: 2.4% enlargement in the directi...

Embodiment 2

[0107] Example 2: Three-stage guide vanes in five-leaf group

[0108] (1) Outline size of three-stage guide vanes in a five-blade group

[0109] Arc length of upper edge plate L 2 It is about 145mm, the arc length L1 of the lower edge plate is about 90mm, the width D of the upper and lower edge plates is about 20mm-40mm, and the length of the blade body L=R 2 -R 1 It is about 180mm, and the total radian of the blade group is 4α=17.1429°.

[0110] (2) Select the shrinkage size

[0111] According to the characteristics of the on-site wax material in the actual production process, the shrinkage rate of the casting mold with a dimension length of 90mm-145mm is 2.1%, the length is 20mm-40mm, 2%, and the length is 180mm, 2.3%.

[0112] That is, ψ 1 = 2.3%, ψ 2 = ψ 3 = 2.1%, ψ 4 = 2%.

[0113] (3) Mold shrinkage design

[0114] By calculation, the offset angle When N is 1, Δα=-30", and when N is 2, Δα=-60".

[0115] Shrinkage enlargement process: On the premise of ensuri...

Embodiment 3

[0116] Example 3: Four-stage guide vanes in five-leaf group

[0117] (1) Outline dimensions of four-stage guide vanes in a five-blade group

[0118] Arc length of upper edge plate L 2 About 145mm, the arc length L of the lower edge plate 1 It is about 85mm, the width D of the upper and lower edge plates is about 20mm~40mm, and the length of the blade body L=R 2 -R 1 It is about 200mm, and the total radian of the blade group is 4α=16.3636°.

[0119] (2) Select the shrinkage size

[0120] According to the characteristics of the on-site wax material in the actual production process, the shrinkage rate of the casting mold with a size of 85mm to 145mm is 2.1%, the length is 20mm to 40mm, 2%, and the length is 200mm, 2.4%.

[0121] That is, ψ 1 = 2.4%, ψ 2 = ψ 3 = 2.1%, ψ 4 = 2%.

[0122] (3) Mold shrinkage design

[0123] By calculation, the offset angle When N is 1, Δα=-43", and when N is 2, Δα=-86".

[0124] Shrinkage enlargement process: On the premise of ensuring th...

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Abstract

The invention discloses a shrinkage factor design method of a precision casting die for multiple-guide vane groups. According to the shrinkage factor design method, a shrinkage factor is finally set by assuming parameters, assuming shrinkage directions and selecting the magnitude of the shrinkage factor; when a wax pattern die is designed and manufactured, corresponding shrinkage factors are set in three directions L, D and R (refer to the assumed shrinkage directions) greatly different in size, and therefore, the out-of-tolerance problem of the channel area of the casting of a multiple-guide vane group due to the adoption of one single shrinkage factor is solved. The shrinkage factor design method of the precision casting die is suitable for all the multiple-guide vane groups. Offset angles delta alpha 1 and delta alpha 2 are obtained by use of a computing method, and therefore, the out-of-tolerance problem of the channel area is solved, and the design concept and the design method are reasonable. The die is designed and manufactured in one step so that the product development cost is greatly reduced and the product trial production period is shortened. The shrinkage factor design method of the precision casting die for the multiple-guide vane groups can be popularized in engineering application.

Description

technical field [0001] The invention belongs to the technical field of investment casting precision casting, and in particular relates to a design method of shrinkage rate of a precision casting mold of multi-leaf group guide vanes. Background technique [0002] In the past, the setting method of the shrinkage rate of the multi-leaf group guide vane precision casting mold was to adopt a unified comprehensive shrinkage rate in different directions. In the actual production process, the shrinkage rates corresponding to different lengths of wax are different, and the traditional method is only suitable for castings with similar dimensional structures in all directions. [0003] For ultra-slender multi-lobed guide vanes, the dimensional structure varies greatly in different directions, and it is unreasonable to adopt a single comprehensive shrinkage rate method, resulting in out-of-tolerance casting dimensions. Under the premise of ensuring the size of the runner surface and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/04
CPCB22C9/04
Inventor 赵儒梁海潮王雷郭涛常涛岐王琳朱珍珠马李朝
Owner AECC AVIATION POWER CO LTD
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