A kind of gypsum mold casting process
A casting process and gypsum molding technology, applied in manufacturing tools, casting molding equipment, casting molds, etc., can solve problems such as limiting the application range of gypsum molding, slow heat dissipation and easy shrinkage in thick and large parts, and easy generation of pores and pinholes. , to solve the problem of sand cracking, good collapsibility and easy operation.
Active Publication Date: 2018-07-20
江西桐青金属工艺品股份有限公司
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Problems solved by technology
[0004] Gypsum casting has the following problems: the main material in the gypsum mixture powder is relatively expensive, and the casting cost is high; it has low air permeability, large shrinkage, slow heat dissipation in thick and large parts and easy shrinkage, easy to produce pores, pinholes, and cold seals. , sand cracks and other characteristics
These problems greatly limit the scope of application of plaster casting
Method used
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[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0026] In an embodiment of the present invention, a gypsum casting process comprises the following steps:
[0027] (1) Preparation of gypsum type: including mold making, correction, initial reinforcement, and total reinforcement;
[0028] (2) Drying and roasting: put the prepared gypsum into the furnace, heat it to 120-200°C at a rate of 10-20°C / h, and then raise the temperature to 250-300°C at a rate of 1-10°C / h. Then heat up to 350-400°C at a rate of 1-5°C / h, and finally r...
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Abstract
The invention discloses a gypsum mould casting process which comprises the following steps: (1) preparing a gypsum mould: comprising moulding, correcting, primarily reinforcing and totally reinforcing; (2) drying and roasting: charging the prepared gypsum mould, heating to 120-200 DEG C at the speed of 10-20 DEG C / h, then raising the temperature to 250-300 DEG C at the speed of 1-10 DEG C / h, then raising the temperature to 350-400 DEG C at the speed of 1-5 DEG C / h and finally raising the temperature to 650-700 DEG C at the speed of 2-10 DEG C / h, and after furnace cooling for 20-24 hours, entering into the next step; and (3) smelting and pouring: selecting a smelting furnace according to the smelting amount for quickly smelting a metal material and raising the temperature of the metal material and meanwhile maintaining the roasting temperature of a casting ladle at 300-400 DEG C and then pouring the molten metal into the roasted gypsum mould in the step (2) by using the casting ladle. The gypsum mould is adopted, so that not only can the cost be lowered, but also the problem of poor air permeability and sand crack of the gypsum can be further solved. The gypsum mould casting process is wide in application.
Description
technical field [0001] The invention relates to a pouring molding process, in particular to a gypsum casting process. Background technique [0002] Gypsum In the 25th to 35th centuries BC, the ancient Egyptians used gypsum as a building material, and it was continuously used and developed until 1920. This technology was further developed to form a production scale, and it developed to the gold and silver jewelry industry in France, Italy and other countries. . In the factories and workshops of Europe, America and Japan, gypsum molds have been widely used as a method of artistic casting and have been developed up to now. [0003] Gypsum mold casting is a special casting process, which refers to a casting method of casting metal solution into a mold made of gypsum as the base material. It can cast non-ferrous metal castings with high surface precision and complex shapes. It has the advantages of easy cleaning and so on, and is often used in the mold manufacturing of non-ferr...
Claims
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IPC IPC(8): B22C9/04B22C1/00
Inventor 陈镇波
Owner 江西桐青金属工艺品股份有限公司