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A kind of preparation method of mold core for metal mold casting

A metal mold casting and metal mold technology, which is applied in casting molding equipment, metal processing equipment, cores, etc., can solve the problems of difficulty in obtaining qualified castings, deteriorate casting quality, and reduce strength, and achieve excellent concession and collapsibility. Good initial strength and good dimensional accuracy

Inactive Publication Date: 2019-02-19
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Only for metal mold casting, the metal mold is always at a relatively high temperature (generally ≥150°C) during the production process. If the frozen sand core is used directly, the core head and its adjacent parts are easily heated by the high-temperature core seat, resulting in a decrease in strength and sand. Core deformation, misalignment, collapse, etc. will deteriorate the quality of castings, and even make it difficult to obtain qualified castings in severe cases

Method used

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  • A kind of preparation method of mold core for metal mold casting
  • A kind of preparation method of mold core for metal mold casting
  • A kind of preparation method of mold core for metal mold casting

Examples

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Effect test

Embodiment 1

[0026] A method for preparing a mold core for metal mold casting. The mold core includes a frozen sand core, a heat insulating material core seat and a metal mold ( figure 1 ), its preparation method comprises the following steps:

[0027] A Preparation of frozen sand core: raw sand, water and additives are used as raw materials, wherein the raw sand is silica sand, quartz sand, zircon sand, magnesia, corundum sand, aluminum-silicon refractory sand, chromite sand, olivine sand, Limestone sand, graphite sand, artificial pearl sand or a mixture of the above types of sand; wherein the additive is one of the silicate binder, phosphate binder and resin or the above-mentioned types of binder Mixture; sand core ratio (mass ratio): 100% raw sand, 6% water, 2% additives, mix evenly and fill into the core box, compact and freeze, the freezing temperature is set at -30°C, the freezing method You can choose cold air perfusion, immersion in liquid nitrogen, freezing in a cold core box, fr...

Embodiment 2

[0036] A method for preparing a mold core for metal mold casting. The mold core includes a frozen sand core, a metal core seat with a cooling cavity and a metal mold ( figure 2 ), its preparation method comprises the following steps:

[0037] A Preparation of frozen sand core: use raw sand and water as raw materials, among which raw sand is silica sand, quartz sand, zircon sand, magnesia, corundum sand, aluminum-silicon refractory sand, chromite sand, olivine sand, limestone sand , graphite sand, artificial pearl sand or a mixture of the above types of sand; sand core ratio (mass ratio): original sand 100%, water 5%, mix evenly and fill into the core box, compact and Freezing, the freezing temperature is set at -50°C, the freezing method can be selected from cold air perfusion, immersion in liquid nitrogen, freezing in a cold core box or freezing in a cold room. The freezing time is subject to the fact that all parts of the sand core reach the predetermined temperature. , to...

Embodiment 3

[0046] A method for preparing a mold core for metal mold casting. The mold core includes a composite core seat composed of a frozen sand core, a heat insulating material and a metal cooling cavity, and a metal mold ( image 3 ), its preparation method comprises the following steps:

[0047] A Preparation of frozen sand core: use raw sand and water as raw materials, among which raw sand is silica sand, quartz sand, zircon sand, magnesia, corundum sand, aluminum-silicon refractory sand, chromite sand, olivine sand, limestone sand , graphite sand, artificial pearl sand or a mixture of the above types of sand; sand core ratio (mass ratio): original sand 100%, water 5%, mix evenly and fill into the core box, compact and Freezing, the freezing temperature is set at -20°C, the freezing method can be selected from cold air perfusion, immersion in liquid nitrogen, freezing in a cold core box or freezing in a cold room. The freezing time is subject to the fact that all parts of the sand...

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Abstract

The invention discloses a preparation method of a metal mold core for casting. Through the method, a freezing sand core is arranged in a metal mold trough a heat isolation core seat to form the metal mold core for casting. The heat isolation core seat is made of heat isolation materials or uses a built-in cooling cavity metal core seat, and has good heat insulation capability; the high temperature of the metal mold can be isolated; the heat transfer can be greatly weakened; the duration of the frozen state of the frozen sand core head and the adjacent positions and the sufficient length maintaining duration can be prolonged, so that the frozen sand core meets the process requirements of the metal mold casting; the application of the green and environment-friendly frozen sand core to the metal mold casting becomes possible.

Description

technical field [0001] The invention relates to the technical field of metal material forming, in particular to a method for preparing a core for metal mold casting. Background technique [0002] Metal mold casting, also known as hard mold casting, is a casting method in which liquid metal is poured into metal molds to obtain castings. According to different filling and solidification pressures, metal mold casting can generally be divided into gravity casting, low-pressure casting, differential pressure casting, and anti-gravity casting. The casting mold of metal mold casting is made of metal, which has strong cooling ability for castings, dense structure and high mechanical properties of castings. The inner cavity of metal mold casting can be formed by metal core or sand core. For inner cavities with complex shapes and difficult to form by core pulling, sand cores are usually used. At the same time, sand cores have better yield than metal cores, which is beneficial to red...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/10B22C1/00B22C1/16
CPCB22C1/00B22C1/16B22C9/10
Inventor 魏国兵胡发平黄耀辉马全杨扆利辉王雨谢卫东
Owner CHONGQING UNIV
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