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Hot investment casting method for electric heating element

An electric heating element and investment casting technology, which is used in the casting of shoulders and gates with multiple points and narrow gaps, can solve the problems of easy deformation of electric heating elements, achieve localization, save procurement costs, and reduce manufacturing. cost effect

Inactive Publication Date: 2011-10-05
JIANGSU BIAOXIN KUBOTA IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the electric heating element is easily deformed during the casting process due to its thin wall thickness, and is easy to form defects such as pores, slag inclusions, and lack of meat.

Method used

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  • Hot investment casting method for electric heating element
  • Hot investment casting method for electric heating element
  • Hot investment casting method for electric heating element

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Embodiment Construction

[0022] The above and other technical features and advantages of the present invention will be described in more detail below in conjunction with the accompanying drawings.

[0023] The electric heating element investment casting method is generally carried out according to the procedures of welding wax molds, making water glass shells, dewaxing, roasting and pouring. The welding wax molds include sprue cups 1, sprues 6, The runner 7 , the ingate 8 to the electric heating element 9 , and the exhaust channel 3 is connected with the sprue cup 1 through the exhaust rod 2 . The invention provides an investment casting method for an electric heating element in order to solve the problem that the electric heating element is easily deformed during the casting process due to its thin wall thickness and is prone to form defects such as pores, slag inclusions, and lack of meat.

[0024] The first step is to press figure 1 The shown group of welding wax patterns, wherein the wall thickne...

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Abstract

The invention discloses a hot investment casting method for an electric heating element, which comprises the steps of: installing and welding a wax mould, making a sodium silicate mould housing, dewaxing, roasting and pouring. The hot investment casting method is characterized in that a multi-point narrow-gap flow gate is arranged on a position being 1 / 3 away from the downside of the electric heating element , an exhaust channel is arranged on the top of the electric heating element, a convex shoulder is arranged on the exhaust channel, a reinforced rib is arranged at the upper part of the electric heating element, a coating at the top of the convex shoulder is removed during housing making to form the opened exhaust channel, and the mould housing is dewaxed and roasted; and the temperature of the mould housing during pouring is ensured to be about 500 DEG C, and the pouring temperature of molten steel is ensured to be about 1430-1450 DEG C.

Description

technical field [0001] The invention relates to an investment casting method of an electric heating element, in particular to a casting method with multi-point narrow gap inner gates and shoulders. Background technique [0002] Electric heating elements have been manufactured abroad before, and its manufacturing technology is monopolized by foreign companies. In order to achieve localization, the industry has been exploring feasible and effective methods, but the effect is not good. For example, Chinese patent CN1173406A discloses a simple investment casting shell-making process, according to dipping (brushing or spraying) alcohol-based paint on the surface of the casting wax model (or module) for 2-3 times, and drying it with cold wind each time. The back is filled with self-bake sand molding, after hardening, soak in water glass for 1-3 minutes, take it out and dry it in the shade, then dewax with hot air, bake at 500-650°C for 1 hour, heat the mold, pour imitation gold-c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C9/08
Inventor 赵亚军赵增宝
Owner JIANGSU BIAOXIN KUBOTA IND
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