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Method for determining laying angle of casting mold in directional solidification casting

A directional solidification and casting technology, which is applied in the field of determining the casting angle of directional solidification casting, can solve the problems of large dispersion rate and crystal defects of directional solidification castings.

Active Publication Date: 2014-04-23
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the case of ensuring that the above control parameters are within a reasonable range, there will still be two problems of crystal defects and a large dispersion rate in directionally solidified castings.

Method used

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  • Method for determining laying angle of casting mold in directional solidification casting
  • Method for determining laying angle of casting mold in directional solidification casting
  • Method for determining laying angle of casting mold in directional solidification casting

Examples

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Embodiment

[0038] The present invention provides an example of determining the placement angle of a turbine blade mold of a certain type of gas turbine in a directional solidification furnace. As shown in Figure 1 (a) and (b), it is the casting mold and blade wireframe diagram of a certain type of gas turbine blade,

[0039] According to the method given in the present invention, use the program given in Appendix A to calculate, and obtain the change habitat diagram of the radiation angle coefficient of the outer wall of the casting mold at the root of the turbine blade shown in Figure 3 (a), as shown in Figure 3 (b) Fig. 3 (c) shows the change habitat diagram of the radiation angle coefficient of the outer wall of the turbine blade airfoil casting mold.

[0040] According to Fig. 3(a), Fig. 3(b) and Fig. 3(c), the single-point radiation angle coefficients along the tenon root of the turbine blade, the connection between the tenon root and the airfoil, and the longitudinal direction of t...

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Abstract

The invention discloses a method for determining the laying angle of a casting mold in directional solidification casting. The method includes the steps: selecting n longitudinal sections along a direction parallel to the growth direction of high-temperature alloy casting directional crystals; respectively analyzing heat dissipation of casting mold outer walls of the selected n longitudinal sections, and calculating single-point radiative angle factors of the casting mold outer walls of the selected n longitudinal sections; adjusting the laying angle of the casting mold in a directional solidification furnace, respectively comparing the single-point radiative angle factors of the outer walls of each selected longitudinal section directly facing an area of a cooling device, and determining the optimal laying angle of the casting mold in the directional solidification furnace when the average value of the difference value of the maximum value and the minimum value of the single-point radiative angle factors of the outer walls of each longitudinal section directly facing the area of the cooling device. By analyzing heat dissipation of the outer wall of a high-temperature alloy casting, the laying angle beneficial to growth of directional crystal structures is obtained.

Description

【Technical field】 [0001] The invention belongs to the field of directional solidification manufacturing, and in particular relates to a method for determining the placement angle of molds in directional solidification casting. 【Background technique】 [0002] The directional solidification casting process can make the grains of directional superalloy castings align along the direction of heat flow loss, which can basically eliminate the transverse grain boundaries perpendicular to the stress axis, thereby greatly improving the performance of superalloy castings, such as turbine blades. Mechanical properties and thermal performance. However, in the actual production process, the produced oriented superalloy castings often contain crystal defects, such as local polycrystalline castings and crystal orientation deviations; The successful manufacture of castings cannot be guaranteed without changing the control conditions. [0003] In view of the two shortcomings of directional ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/00
Inventor 李涤尘廉媛媛鲁中良
Owner XI AN JIAOTONG UNIV
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