Method for preventing surface decarbonization of ceramic precision casting die

A technology of precision casting and mould, applied in the field of protection of casting surface quality, can solve the problem of surface decarburization of ceramic precision casting mould

Inactive Publication Date: 2005-09-07
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The purpose of the present invention is to solve the problem of decarburization on the surface of ceramic precision casting molds, and provide a method for preventing the surface decarburization of ceramic precision casting molds

Method used

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  • Method for preventing surface decarbonization of ceramic precision casting die

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Embodiment Construction

[0018] see figure 1 As shown, the mold shell used in the present invention is a composite ceramic type, the mold cavity is formed by the ceramic type 5, the back cover is a water glass sand cover 4, the upper box 2 and the lower box 1 are combined to form a mold, and the upper box 1 is provided with a pouring mold. Road 8, the heat-resistant protective cover 3 is set outside the mold, and a vent hole 6 is opened above it. One end of the vacuum hose 9 is connected to the water glass sand sleeve 4 from the bottom, and the other end is communicated with the gas source through the flow meter 10 and the valve 11. , the concrete steps of the method of the present embodiment are as follows:

[0019] 1. After the composite ceramic mold is taken out of the 350°C roasting furnace, natural gas is introduced from the bottom into the mold shell through the vacuum hose 9 to drive away the air in the mold shell and cavity and occupy the entire space of the mold shell and cavity When pouring...

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Abstract

The present invention discloses the method of preventing surface decarbonization of precision casting ceramic die. Before casting, gas or hydrocarbon gas is inflated into the die shell and the die cavity to replace air in the whole space of the die shell and the die cavity. During casting, inflation is stopped, because the casting temperature over 1000 deg.c will produce flame to deplete oxygenand reduction atmosphere to prevent decarbonization of the surface cementite. After casting, one heat resisting protection hood with gas vent is covered the die shell and said gas is further inflated into to deplete oxygen in the space between the hood and the die shell until the temperature of the casting is lowered to below 600 deg.c and no decarbonization reaction takes place.

Description

technical field [0001] The invention relates to a method for protecting the surface quality of castings, in particular to a method for preventing surface decarburization of ceramic precision casting molds. Background technique [0002] At present, casting molds such as casting hot forging molds, casting cold stamping molds, and casting drawing molds are gradually emerging instead of machine-added molds. The cost of the casting mold is only 1 / 10 of that of the machine-made mold, and the cost is low. Compared with the machine-made mold, the process is simple and the waste of materials can be greatly reduced. However, due to the extremely small or almost zero machining allowance of casting molds and the need for strict heat treatment processes, especially in the casting process due to the presence of a certain concentration of oxidizing gas medium around, the surface of the casting at high temperature is prone to oxidation and detachment. Carbon phenomenon, its chemical reacti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D21/00
Inventor 陈莉赵宇
Owner CHANGCHUN UNIV OF TECH
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