CN114850398B

CN114850398B - Manufacturing method of wax mould for investment casting of supporting ring

Info

Publication number: CN114850398B
Application number: CN202210312131.8A
Authority: CN
Inventors: 孙冰; 麻毅; 孙宏喆; 乔海滨; 王哲; 杨学东
Original assignee: Luoyang Sunrui Titanium Precision Casting Co Ltd
Current assignee: Luoyang Sunrui Titanium Precision Casting Co Ltd
Priority date: 2022-03-28
Filing date: 2022-03-28
Publication date: 2023-08-11
Anticipated expiration: 2042-03-28
Also published as: CN114850398A

Abstract

The method for manufacturing the wax mould for the investment casting of the supporting ring comprises the steps that a plurality of compensation pits are formed in the inner cavity surface of a metal mould corresponding to the surface of one side, away from each other, of two annular bodies of the wax mould, and the compensation pits correspond to projections of a plurality of connecting columns of the wax mould on the surface of the annular bodies respectively; then, a metal mold is used for manufacturing the wax mold by adopting a pressing injection method, the metal mold is removed after the wax mold is solidified and molded, a plurality of compensation bulges corresponding to the projection of the connecting column are respectively formed on the surfaces of the two annular bodies of the wax mold, which are opposite to each other, through a plurality of compensation pits, a certain reverse compensation amount is given to the metal mold in advance, so that the wax mold with the reverse compensation bulges at the original pit positions is obtained, the surface of the wax mold is only needed to be trimmed, manual melting and wax supplementing at the pit positions is not needed, the wax mold with good surface quality and high size precision can be obtained, the problem of pit on the surface of the wax mold is avoided, and the work load of repairing the wax mold by the surface of the wax mold can be reduced.

Description

Manufacturing method of wax mould for investment casting of supporting ring

Technical Field

The invention relates to the field of wax molds for supporting ring investment casting, in particular to a manufacturing method of a wax mold for supporting ring investment casting.

Background

The supporting ring is one of important parts on aviation equipment, and is mainly used for supporting and connecting, is a casting product commonly encountered in the field of precision casting of investment in aviation industry, is of a double-ring structure, has the outer diameter of phi 75-phi 150mm, the inner diameter of phi 50-phi 125mm and the thickness of 2mm, and is characterized in that cylinders with the diameter phi 8mm and the length of 8-10 mm are distributed among the double rings at equal intervals along the circumferential direction, and the double rings and the cylinders of the parts are often important parts in cooperative fit with other bearing parts, so that the requirements on the external dimensional precision and the surface quality of the parts are strict.

The support ring is usually cast, a wax mold is needed to be used for casting the sand mold, the wax mold is manufactured by adopting molten mold materials, a metal mold with an inner cavity in the same shape as the wax mold is manufactured first, then the metal mold is injected in a pressing mode, the wax mold is solidified layer by layer from the outside to the inside, and the wax mold is obtained after the metal mold is removed. The feeding of wax liquid in the wax injection channel and the thick cylindrical region can be continuously obtained in the solidification process of the thin-wall part of the supporting ring, so that the shrinkage of the body is small, and the sinking is light; the wax injection channel solidifies before the thick region of the cylinder, so that the end face of the supporting ring close to the cylinder cannot be continuously fed with molten wax, and the shrinkage is larger and serious; in addition, the hard shell layer can generate concentrated pits due to the hard shell effect on the surfaces of the two ends of the cylinder in the cooling process after the wax mould is taken out, and finally pits formed at the projection positions of a plurality of cylinders on the outer surface of the supporting ring can influence the appearance quality of the wax mould. The existing repairing method is to adopt soldering irons to melt wax liquid in advance, respectively drip the molten wax liquid into pits on the outer surface of a wax mold, and repair the molten wax liquid one by adopting a scraper after cooling and shaping. The mode has the advantages of large repair modulus, low efficiency and poor dimensional stability, and the wax pattern can be damaged due to overheat in the process, so that reasonable optimization is urgently needed.

Disclosure of Invention

The invention provides a manufacturing method of a wax pattern for supporting ring investment casting, which aims to solve the problem that the surface of the wax pattern is easy to generate pits in the conventional wax pattern for supporting ring investment casting.

The technical scheme adopted by the invention for solving the technical problems is as follows: the manufacturing method of the wax mould for the supporting ring investment casting comprises a supporting ring wax mould body and a Y-shaped pouring gate wax mould body, wherein the supporting ring wax mould body comprises two annular bodies which are oppositely arranged, a plurality of connecting columns are arranged between the two annular bodies, the Y-shaped pouring gate wax mould body is positioned at one side of the supporting ring wax mould body, and the Y-shaped pouring gate wax mould body is connected with the side wall of one of the annular bodies; the method comprises the following steps:

firstly, manufacturing a metal mold, wherein the inner cavity of the metal mold is matched with a wax mold, a plurality of compensation pits are arranged on the surface of the inner cavity of the metal mold corresponding to the surface of one side, which is away from each other, of two annular bodies, the plurality of compensation pits respectively correspond to projections of a plurality of connecting columns on the surface of one side, which is away from each other, of the two annular bodies, the depth of each compensation pit is 0.25-0.5 mm, and the edges of the compensation pits are in smooth transition with the surface of the inner cavity of the metal mold;

then, a metal mold is used for manufacturing a wax mold by adopting a pressing injection method, the metal mold is removed after solidification and molding of the wax mold, a plurality of compensating bulges corresponding to projection of a connecting column are respectively formed on the surfaces of the two annular bodies of the wax mold on the sides facing away from each other through a plurality of compensating pits, and then the surfaces of the two annular bodies on the sides facing away from each other are trimmed, so that the wax mold for investment casting of the support ring is manufactured.

Preferably, after the wax mould is solidified and formed and taken out from the metal mould, the compensating protrusions on the surface of the annular body are scraped or wiped, so that the surfaces of the two annular bodies on the sides which are mutually away from each other are all leveled.

According to the technical scheme, the invention has the beneficial effects that:

when the metal mold is designed and manufactured, the inner cavity surface of the metal mold is provided with the plurality of compensating pits in advance, and the positions of the compensating pits are all positions where the wax mold is easy to form pits in the pressing and injection process, so that the wax mold with good surface quality and high dimensional accuracy can be obtained by using the metal mold, the problem of pit on the surface of the wax mold for supporting ring casting is avoided, the problem of repairing the wax mold for supporting ring casting can be solved, the investment pattern repair workload of the wax mold for supporting ring casting can be reduced, the investment pattern production cost and the investment pattern repair period of the wax mold for supporting ring casting can be greatly reduced, and the investment pattern is particularly suitable for batch production.

Drawings

FIG. 1 is a side view of a wax pattern;

FIG. 2 is a left side view of FIG. 1;

FIG. 3 is a right side view of FIG. 1;

fig. 4 is a partial enlarged view of fig. 1.

The marks in the figure: 1. the device comprises an annular body, a connecting column, a Y-shaped pouring gate wax die body, a compensation protrusion and a connecting column.

Detailed Description

Referring to the drawings, the specific embodiments are as follows:

1-3, the wax pattern comprises a supporting ring wax pattern body and a Y-shaped pouring gate wax pattern body 3, wherein the supporting ring wax pattern body comprises two oppositely arranged annular bodies 1, a plurality of connecting columns 2 are arranged between the two annular bodies 1, the Y-shaped pouring gate wax pattern body 3 is positioned on one side of the supporting ring wax pattern body, and the Y-shaped pouring gate wax pattern body 3 is connected with the side wall of one of the annular bodies 1. The shape of the supporting ring wax mould body is consistent with that of the supporting ring, a casting inner cavity corresponding to the supporting ring can be formed after the supporting ring wax mould body is heated and disappeared in the sand mould, and the Y-shaped runner wax mould body 3 can form a runner communicated with the casting inner cavity after the supporting ring wax mould body is heated and disappeared in the sand mould.

The method comprises the following steps:

firstly, a metal mold is manufactured, the inner cavity of the metal mold is matched with a wax mold, a plurality of compensation pits are formed in the surface of the inner cavity of the metal mold corresponding to the surface of one side, away from each other, of the two annular bodies 1, the compensation pits correspond to projections of a plurality of connecting columns 2 on the surface of one side, away from each other, of the two annular bodies 1, the depth of each compensation pit is 0.25-0.5 mm, and the edges of the compensation pits are in smooth transition with the surface of the inner cavity of the metal mold.

Then, a metal mold is used for manufacturing a wax mold by adopting a pressure injection method, the metal mold is removed after solidification and molding of the wax mold, and a plurality of compensating bulges 4 corresponding to the projection of the connecting column 2 are respectively formed on the surfaces of the two annular bodies 1 of the wax mold, which are away from one another, through a plurality of compensating pits. As shown in fig. 2-4, one of the annular bodies 1 has 9 compensating protrusions 4 on its surface and the other annular body 1 has three positions on its surface for connection to the Y-runner wax mould body 3, thus having 6 compensating protrusions 4. The positions of the compensation bulges 4 are all positions where pits are easy to form in the injection process of the wax mould, so that pits can be effectively prevented from being formed on the surface of the wax mould.

After the wax pattern is solidified and molded and is taken out from the metal mold, the compensation protrusions 4 on the surfaces of the annular bodies 1 are scraped or wiped, so that the surfaces of the two annular bodies 1, which are away from each other, are flat, and the wax pattern for supporting ring investment casting is prepared, and the wax pattern with the reverse compensation protrusions at the original pit positions is obtained by giving a certain reverse compensation amount to the metal mold in advance, so that the wax pattern with good surface quality and high dimensional accuracy can be obtained without manually 'dripping' the wax pattern at the pit positions, the problem of pit on the surface of the wax pattern for supporting ring investment casting is avoided, and the work load of repairing the wax pattern for supporting ring investment casting can be reduced.

Claims

1. The manufacturing method of the wax mould for the supporting ring investment casting comprises a supporting ring wax mould body and a Y-shaped pouring gate wax mould body (3), wherein the supporting ring wax mould body comprises two annular bodies (1) which are oppositely arranged, a plurality of connecting columns (2) are arranged between the two annular bodies (1), the Y-shaped pouring gate wax mould body (3) is positioned on one side of the supporting ring wax mould body, and the Y-shaped pouring gate wax mould body (3) is connected with the side wall of one of the annular bodies (1), and the manufacturing method is characterized by comprising the following steps:

firstly, manufacturing a metal mold, wherein the inner cavity of the metal mold is matched with a wax mold, a plurality of compensation pits are arranged on the surface of the inner cavity of the metal mold, which corresponds to the surface of one side, away from each other, of two annular bodies (1), the plurality of compensation pits correspond to projections of a plurality of connecting columns (2) on the surface of one side, away from each other, of the two annular bodies (1), the depth of each compensation pit is 0.25-0.5 mm, and the edges of each compensation pit are in smooth transition with the surface of the inner cavity of the metal mold;

then a metal mold is used for manufacturing a wax mold by adopting a pressing injection method, the metal mold is removed after solidification and molding of the wax mold, a plurality of compensating bulges (4) corresponding to the projection of the connecting column (2) are respectively formed on the surfaces of the two annular bodies (1) on the sides, facing away from each other, of the wax mold through a plurality of compensating pits, and then the surfaces of the two annular bodies (1) on the sides, facing away from each other, are trimmed, so that the wax mold for investment casting of the support ring is manufactured.

2. The method of making a wax pattern for investment casting of a carrier ring as recited in claim 1, wherein: after the wax mould is solidified and formed and is taken out from the metal mould, scraping or wiping treatment is carried out on the compensating protrusions (4) on the surfaces of the annular bodies (1), so that the surfaces of the two annular bodies (1) on the sides facing away from each other are all leveled.