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Shell making process for elongated hole flange investment casting

A technology of investment casting and slender holes, applied in the field of investment manufacturing, can solve the problems of long shell making cycle, difficult to guarantee construction period, unable to guarantee quality, etc., and achieve the effect of shortening drying time

Inactive Publication Date: 2010-03-17
山东燕山精密机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] To sum up, there are three defects in the production of castings with slender hole flanges using the existing technology: first, the quality cannot be guaranteed, second, the shell-making cycle is long, and third, the construction period is difficult to guarantee

Method used

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Experimental program
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Effect test

Embodiment

[0017] Embodiment: A shell-making process for investment casting of a flange with a slender hole: first, the shell is formed after the surface layer, a transition layer, and a transition layer are passed on the surface of the slender-hole flange wax, and after it is completely dry, one end of the hole is used Paste refractory powder slurry, (the ratio is: mix with 200 mesh mollet powder and back layer of silica sol, the content of silica sol is 25%) to block, and then pour 100 to 120 mesh from the other end of the hole For refractory sand, after the other end is filled tightly, the other end is blocked with a paste-like refractory powder slurry, and then the back layer is applied once, and the back layer is applied twice after drying. After drying again, the slurry is sealed, and the shell-making process is completed. Its overall process and process parameters are shown in Table 1.

[0018] Table 1

[0019] layers

[0020]

[0021] The molded shell made by...

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Abstract

The invention discloses a shell making process for elongated hole flange investment casting, which comprises the following steps: firstly forming a shell on the surface of an elongated hole flange waxpattern through spreading a surface layer, spreading a transition layer for the first time and spreading the transition layer for the second time, then blocking one end of a hole with pasty refractory paste after completely drying, then pouring refractory sand with 100-120 meshes into the other end of the hole, blocking the other end also with the pasty refractory paste after compactly pouring, then spreading a backing layer for the first time, spreading the backing layer for the second time after drying, drying again, carrying out slurry sealing, and finishing the shell making process. Compared with the prior art, the shell making process has the biggest characteristic that the refractory paste is adopted for blocking the elongated hole, then the refractory sand is poured, and then the next steps of backing layer spreading, slurry sealing and the like are carried out. The shell made through the process does not drill steel after pouring, sand is easily cleaned, and meanwhile, the drying time is greatly shortened from the original 7 days to 4 days, and the quality is improved from the original lower than 20 percent to more than 95 percent.

Description

technical field [0001] The invention relates to a shell-making process for investment casting of flanges with slender holes, and belongs to the field of investment manufacturing. Background technique [0002] At present, in the shell-making process of investment casting silica sol, the shell-making process of surface layer-transition layer-back layer (repeated one or more times)-seal layer is mostly used, but this process is used in the manufacture of flanges with slender holes. However, the following defects exist in castings: steel drilling is very easy to occur in the slender hole. The main reason is that due to the slender hole, bridging phenomenon or poor drying of the inner hole occurs in the slender hole during the slurry dipping process. 6.5Mpa-7Mpa) under high temperature roasting (1050°C), the core strength is not enough due to bridging in the elongated hole or poor drying, and the core will fall off or crack during the process of dewaxing and roasting, and then ap...

Claims

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Application Information

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IPC IPC(8): B22C9/04
Inventor 陈培敦赵士锋房亮刘呈俊李昌琦
Owner 山东燕山精密机械有限公司
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