Ceramic core for silica sol precision casting and manufacturing process thereof

Abstract

The invention discloses a ceramic core for silica sol precision casting and a manufacturing process thereof. Main body components of the ceramic core comprise refined quartz powder and a proper amount of collapsing agent, and the surface of the ceramic core is coated with high-temperature resistant paint with a thickness of 0.1 to 0.2 millimeter; and at the same reasonable manufacturing processes such as mixing, core making and roasting are adopted. In the ceramic core for casting, the unique material mixing and manufacturing processes are adopted, and the reasonable use of the refined quartz powder and the collapsing agent improves the collapsibility of the ceramic core after casting considerably, the high-quality high-temperature resistant material in ingredients enables the core to resist the erosion of high-temperature molten metals, and the high-temperature resistant paint on the surface of the ceramic core not only improves the high temperature resistance during casting, but also increases the cooling speed of the molten metal.

Description

technical field

[0001] The invention relates to a casting material and its manufacturing process, in particular to a casting core and its manufacturing process. Background technique

[0002] The silica sol precision casting process can produce precise and complex metal parts that are close to the final shape of the product and can be used directly without or with little processing. It is characterized by high dimensional accuracy and good surface finish. However, castings with complex inner cavity, small aperture or narrow and curved castings may have difficulties in shell making, and it is difficult to control the dimensional accuracy. Using excellent ceramic cores to produce such castings can solve the above problems well. At present, there are more and more factories using silica sol precision casting technology to produce small and medium-sized steel castings, but most of them produce castings with relatively simple inner cavities. . Due to the needs of the market, Chi...

Examples

Embodiment Construction

[0028] The present invention will be further described below in conjunction with specific examples.

[0029] a. Inspect the composition and particle size of refined quartz powder and disintegrating agent according to the following indicators:

[0030] SiO of refined quartz powder 2 The content is greater than 96%, and its particle size is 270-325 mesh; the particle size of the disintegrating agent is 270-325 mesh;

[0031] b. According to the following requirements, configure the binder for standby use (the following table is the weight percentage of the components of the binder):

[0032] Example 1

Example 2

Example 3

58# paraffin

60

70

90

Primary Stearic Acid

40

30

10

[0033] c. Add 2-4 parts by weight of disintegrating agent to 100 parts by weight of refined quartz powder, and fully mix in a ball mill for 2 hours (the following table shows the amount of disintegrating agent by weight);

[0034] ...

technical field

[0001] The invention relates to a casting material and its manufacturing process, in particular to a casting core and its manufacturing process. Background technique

[0002] The silica sol precision casting process can produce precise and complex metal parts that are close to the final shape of the product and can be used directly without or with little processing. It is characterized by high dimensional accuracy and good surface finish. However, castings with complex inner cavity, small aperture or narrow and curved castings may have difficulties in shell making, and it is difficult to control the dimensional accuracy. Using excellent ceramic cores to produce such castings can solve the above problems well. At present, there are more and more factories using silica sol precision casting technology to produce small and medium-sized steel castings, but most of them produce castings with relatively simple inner cavities. . Due to the needs of the market, Chi...

Examples

Embodiment Construction

[0028] The present invention will be further described below in conjunction with specific examples.

[0029] a. Inspect the composition and particle size of refined quartz powder and disintegrating agent according to the following indicators:

[0030] SiO of refined quartz powder 2 The content is greater than 96%, and its particle size is 270-325 mesh; the particle size of the disintegrating agent is 270-325 mesh;

[0031] b. According to the following requirements, configure the binder for standby use (the following table is the weight percentage of the components of the binder):

[0032] Example 1

Example 2

Example 3

58# paraffin

60

70

90

Primary Stearic Acid

40

30

10

[0033] c. Add 2-4 parts by weight of disintegrating agent to 100 parts by weight of refined quartz powder, and fully mix in a ball mill for 2 hours (the following table shows the amount of disintegrating agent by weight);

[0034] ...

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