阅读说明：本技术 一种精确检测高温合金精密铸件型壳内腔尺寸的方法 (Method for accurately detecting size of inner cavity of shell of high-temperature alloy precision casting ) 是由 张洪雪 倪伟 朱洪斌 韩宏 张松胜 于 2019-11-29 设计创作，主要内容包括：本发明涉及高温合金精密铸造技术领域,特别是涉及一种精确检测高温合金精密铸件型壳内腔尺寸的方法。该方法通过锡铋合金按特定的浇注方法及参数浇注型壳,去除型壳后得到精确复制型壳内腔的锡铋合金铸件,然后对锡铋合金铸件进行尺寸检测,进而得到型壳内腔尺寸数据。本发明的技术可以精确复制型壳内腔的尺寸,且得到的锡铋合金铸件表面光滑细密,锡铋合金铸件可以采用光学测量仪器或三坐标测量机进行测量,获得精确的型壳内腔尺寸数据。本发明的技术操作简便、高效,可大范围推广应用。(The invention relates to the technical field of high-temperature alloy precision casting, in particular to a method for accurately detecting the size of an inner cavity of a shell of a high-temperature alloy precision casting. According to the method, a shell is poured by a tin-bismuth alloy according to a specific pouring method and specific parameters, a tin-bismuth alloy casting which accurately replicates the inner cavity of the shell is obtained after the shell is removed, and then the size of the tin-bismuth alloy casting is detected, so that the size data of the inner cavity of the shell is obtained. The technology of the invention can accurately copy the size of the inner cavity of the shell, the surface of the obtained tin-bismuth alloy casting is smooth and fine, and the tin-bismuth alloy casting can be measured by adopting an optical measuring instrument or a three-coordinate measuring machine to obtain accurate size data of the inner cavity of the shell. The technology of the invention is simple and efficient to operate, and can be popularized and applied in a large range.)

1. The method for accurately detecting the size of the inner cavity of the shell of the high-temperature alloy precision casting is characterized by comprising the following steps of:

1) selecting the tin-bismuth-containing alloy with the weight ratio of 6: 4, weighing the tin-bismuth alloy block for later use;

2) according to the weight of the tin-bismuth alloy, a 10kg turnover furnace or a 30kg medium-frequency induction furnace is adopted, the temperature is set to be 280-320 ℃, and the tin-bismuth alloy is melted for standby;

3) selecting a high-temperature alloy precision casting shell, and carrying out the following treatment:

if the casting is a structural part, taking a sand box to fill sand into the shell and fix the shell, enabling the pouring cup of the shell to face upwards, pouring the fully molten tin-bismuth alloy into the shell along the pouring cup of the shell at a pouring speed controlled to be 1.5 kg/s-2.5 kg/s, standing the shell after pouring, and naturally cooling the shell for later use;

if the casting is a directional blade or a single crystal blade, preparing a binder, and mixing the materials in a mass ratio of 1: (1.5-2.5) putting the water glass and the bauxite powder for casting into a container, stirring and mixing until the mixture is pasty, plugging a shell pouring cup by using a pasty binder, drying, taking a sand box to fill and fix the shell after the binder is fully hardened, pouring fully melted tin-bismuth alloy into the shell one by one along a disc crystalline pore at the bottom of the shell with the shell pouring cup facing downwards, controlling the pouring speed to be 0.5-1.5 kg/s, standing after pouring, and naturally cooling for later use;

4) removing shells of the tin-bismuth alloy pieces by a method combining manual beating and grinding with a grinding wheel;

5) carrying out optical scanning detection or three-coordinate detection on the tin-bismuth alloy casting to determine size data of the tin-bismuth alloy casting;

6) and comparing and analyzing the size data of the tin-bismuth alloy casting with the standard casting model to determine whether the size of the shell is out of tolerance.

Technical Field

The invention relates to the technical field of high-temperature alloy precision casting, in particular to a method for accurately detecting the size of an inner cavity of a shell of a high-temperature alloy precision casting.

Background

High temperature alloy precision castings (hereinafter castings) are generally formed by pouring high temperature alloy liquid into a shell, and the size of the casting is directly related to the size of the inner cavity of the shell. In the casting size shaping process, the casting size is often out of tolerance, and the size of the inner cavity of the shell needs to be checked again at this time, but a feasible accurate inspection method is not available at present. The existing method for determining the size of the cavity of the shell by adopting the resin casting shell is difficult to obtain a perfect resin part, the surface of the resin part is very rough, burrs are numerous, the cavity of the shell cannot be accurately copied, reliable data reference cannot be provided for quantitative analysis of the size of the cavity of the shell, and assistance is difficult to be provided for size shaping of a high-temperature alloy precision casting.

Disclosure of Invention

The invention aims to provide a method for accurately detecting the size of an inner cavity of a shell of a high-temperature alloy precision casting, solves the problem that the size of the inner cavity of the shell of the high-temperature alloy precision casting cannot be accurately detected, and can provide accurate data reference for the size shaping of the high-temperature alloy precision casting.

The technical scheme of the invention is as follows:

a method for accurately detecting the size of an inner cavity of a shell of a high-temperature alloy precision casting comprises the following steps:

1) selecting the tin-bismuth-containing alloy with the weight ratio of 6: 4, weighing the tin-bismuth alloy block for later use;

2) according to the weight of the tin-bismuth alloy, a 10kg turnover furnace or a 30kg medium-frequency induction furnace is adopted, the temperature is set to be 280-320 ℃, and the tin-bismuth alloy is melted for standby;

3) selecting a high-temperature alloy precision casting shell, and carrying out the following treatment:

if the casting is a structural part, taking a sand box to fill sand into the shell and fix the shell, enabling the pouring cup of the shell to face upwards, pouring the fully molten tin-bismuth alloy into the shell along the pouring cup of the shell at a pouring speed controlled to be 1.5 kg/s-2.5 kg/s, standing the shell after pouring, and naturally cooling the shell for later use;

if the casting is a directional blade or a single crystal blade, preparing a binder, and mixing the materials in a mass ratio of 1: (1.5-2.5) putting the water glass and the bauxite powder for casting into a container, stirring and mixing until the mixture is pasty, plugging a shell pouring cup by using a pasty binder, drying, taking a sand box to fill and fix the shell after the binder is fully hardened, pouring fully melted tin-bismuth alloy into the shell one by one along a disc crystalline pore at the bottom of the shell with the shell pouring cup facing downwards, controlling the pouring speed to be 0.5-1.5 kg/s, standing after pouring, and naturally cooling for later use;

4) removing shells of the tin-bismuth alloy pieces by a method combining manual beating and grinding with a grinding wheel;

5) carrying out optical scanning detection or three-coordinate detection on the tin-bismuth alloy casting to determine size data of the tin-bismuth alloy casting;

6) and comparing and analyzing the size data of the tin-bismuth alloy casting with the standard casting model to determine whether the size of the shell is out of tolerance.

The invention has the advantages and beneficial effects that:

1. the technology of the invention can accurately copy the size of the inner cavity of the shell, the surface of the obtained tin-bismuth alloy casting is smooth and fine, and the tin-bismuth alloy casting can be measured by adopting an optical measuring instrument or a three-coordinate measuring machine to obtain accurate size data of the inner cavity of the shell. The technology of the invention is simple and efficient to operate, and can be popularized and applied in a large range. Therefore, whether the size of the inner cavity of the shell of the high-temperature alloy casting is out of tolerance or not can be determined quickly and efficiently, quantitative data reference is provided for size shaping of the high-temperature alloy precision casting, the size shaping period of the casting is greatly shortened, and the research and development cost of the casting is reduced.

2. The invention provides a technology for accurately inspecting the inner cavity of a shell, which comprises the steps of pouring the shell by using a tin-bismuth alloy according to a specific pouring method and specific parameters, removing the shell to obtain a tin-bismuth alloy casting for accurately copying the inner cavity of the shell, and then detecting the size of the tin-bismuth alloy casting to further obtain the size data of the inner cavity of the shell.

3. The demand of high-temperature alloy precision castings is increased year by year, and after the technology provided by the invention is used, accurate data reference can be provided for analysis of reasons for casting dimension out-of-tolerance, the casting dimension shaping period is shortened, and the development cost is reduced. The technology is applied to the size out-of-tolerance analysis process of a certain high-guide blade, the reason of the size out-of-tolerance of the casting is effectively determined, the size shaping period and the development cost of the casting are greatly shortened, and the technology can be popularized and applied to the size shaping of castings of complex structural parts, blades and the like.

Detailed Description