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Method for relieving shell expansion of 3D printing photosensitive resin mold in investment casting

A technology of photosensitive resin and investment casting, which is applied in casting molding equipment, molds, mold components, etc., and can solve problems such as inappropriate structural photosensitive resin models.

Inactive Publication Date: 2021-07-13
SHANGHAI UNION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can solve the shell expansion problem of photosensitive resin models with simple structures and small shapes, it is not suitable for photosensitive resin models with complex structures.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for improving shell expansion of a 3D printed photosensitive resin mold in investment casting, comprising:

[0035] Configure low-temperature wax: melt 80wt% paraffin and 20wt% stearic acid at 70°C to obtain wax liquid and control its constant temperature at 65°C;

[0036] Photosensitive resin mold preheating: preheat the photosensitive resin mold to 40°C, and then keep it warm for about 10 minutes;

[0037] Coating low-temperature wax: immerse the preheated photosensitive resin mold completely in the wax liquid, so that the wax liquid evenly coats the surface of the photosensitive resin mold, and the wax immersion time is controlled within 3 seconds;

[0038] Low-temperature wax control: quickly take out the wax-coated photosensitive resin mold from the wax liquid, and quickly put it into low-temperature cold water to make the wax liquid uniformly solidify on the surface of the photosensitive resin mold.

[0039] After testing, it is found that this method ca...

Embodiment 2

[0041] A method for improving shell expansion of a 3D printed photosensitive resin mold in investment casting, comprising:

[0042] Configure low-temperature wax: melt 85wt% paraffin and 15wt% stearic acid at 68°C to obtain a wax liquid and control its constant temperature at 65°C;

[0043] Photosensitive resin mold preheating: preheat the photosensitive resin mold to 38°C, and then keep it warm for about 10 minutes;

[0044] Coating low-temperature wax: immerse the preheated photosensitive resin mold completely in the wax liquid, so that the wax liquid evenly coats the surface of the photosensitive resin mold, and the wax immersion time is controlled at 5 seconds;

[0045] Low-temperature wax control: quickly take out the wax-coated photosensitive resin mold from the mixed wax liquid, and quickly put it into low-temperature cold water to make the wax liquid uniformly solidify on the surface of the photosensitive resin mold.

Embodiment 3

[0047] A method for improving shell expansion of a 3D printed photosensitive resin mold in investment casting, comprising:

[0048] Configure low-temperature wax: melt 90wt% paraffin and 10wt% stearic acid at 66°C to obtain a wax liquid and control its constant temperature at 60°C;

[0049] Photosensitive resin mold preheating: preheat the photosensitive resin mold to 35°C, and then keep it warm for about 15 minutes;

[0050] Coating low-temperature wax: immerse the preheated photosensitive resin mold completely in the wax liquid, so that the wax liquid evenly coats the surface of the photosensitive resin mold, and the wax immersion time is controlled at 7 seconds;

[0051] Low-temperature wax control: quickly take out the wax-coated photosensitive resin mold from the mixed wax liquid, and quickly put it into low-temperature cold water to make the wax liquid uniformly solidify on the surface of the photosensitive resin mold.

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Abstract

The invention discloses a method for relieving shell expansion of a 3D printing photosensitive resin mold in investment casting. The method comprises the steps that the surface of the photosensitive resin mold is coated with low-temperature wax to form a uniform wax layer, wherein the low-temperature wax is a mixture of paraffin and stearic acid, the content of the paraffin is 80-95 wt%, and the content of the stearic acid is 5-20 wt%. The surface of the photosensitive resin mold is coated with the uniform wax layer, the wax layer is in a molten state under high-temperature steam, and molten wax liquid can flow out of a mold shell or be absorbed by the mold shell of a porous structure, so that a gap is reserved between the photosensitive resin mold and the mold shell, the gap provides a buffer space for thermal expansion of the photosensitive resin mold, the pressure on the mold shell is reduced, and in this way, the shell expansion problem of the photosensitive resin mold in the dewaxing process is relieved.

Description

technical field [0001] The invention belongs to the field of investment casting, and in particular relates to a method for improving shell expansion of a 3D printed photosensitive resin mold in investment casting. Background technique [0002] 3D printing, also known as Rapid Prototyping (RP), is a technology for rapid manufacturing of parts of any shape based on the principle of additive manufacturing. The rapid development of 3D printing provides new ideas for traditional industrial production. Combining 3D printing with traditional industries can effectively improve the production efficiency of traditional industries and reduce material loss during production, thereby saving production costs and creating greater economic benefits. SLA forming, also known as stereolithograph Appearance, as a kind of 3D printing, uses photosensitive resin as raw material, which changes from liquid to solid under the irradiation of ultraviolet light of a specific wavelength, from point to l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C7/02B22C3/00B33Y80/00
CPCB22C9/043B22C7/02B22C3/00B33Y80/00
Inventor 马劲松于清晓徐静李飞来俊华
Owner SHANGHAI UNION TECH
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