A 3d printed resin mold for investment casting

Abstract

The utility model relates to a kind of 3D printing resin mould for investment casting, including resin shell, the resin shell is equipped with hollow inner cavity, the hollow inner cavity is equipped with by resin three-dimensional network structure;The resin shell outside is equipped with several hole columns with the hollow inner cavity communication.The utility model uses hollow resin shell with three-dimensional network structure to replace traditional wax piece, can shorten to 7 days to improve sample preparation efficiency with sample preparation period, and can avoid the problem that shell mould appears crack shell when dewaxing and causes the problem that sample preparation cannot be completed;By being equipped with several hole columns with hollow inner cavity communication, when baking (i.e. corresponding traditional dewaxing procedure) can have vent hole to discharge the gas of resin combustion gasification, guarantee shell quality.

Description

Technical Field

[0001] This utility model relates to the field of investment casting, and in particular to a 3D printed resin mold for investment casting. Background Technology

[0002] Investment casting involves multiple processes, including wax injection, wax repair, tree assembly, shell making, dewaxing, firing, pouring, shell vibration, sprue cutting and sand removal, with the entire sample preparation cycle lasting 15 to 25 days. Among these processes, shell cracking is prone to occur during dewaxing, which may prevent the final sample from being completed. Utility Model Content

[0003] Therefore, it is necessary to provide a 3D printed resin mold for investment casting, addressing the current problems of long sample preparation cycles and shell cracking caused by dewaxing.

[0004] This utility model provides a 3D printed resin module for investment casting, including a resin shell, the resin shell having a hollow inner cavity, the hollow inner cavity having a three-dimensional mesh structure formed of resin; the outer side of the resin shell has a plurality of perforated columns communicating with the hollow inner cavity.

[0005] In some embodiments, the wall thickness of the resin shell is 0.5 mm to 0.8 mm.

[0006] In some of these embodiments, the perforated column is sealed with wax.

[0007] In some embodiments, the diameter of the perforated column is 6mm to 10mm.

[0008] In some embodiments, the perforated column is adapted to a through hole on the shell mold, which is obtained by impregnating the resin shell with slurry.

[0009] In some embodiments, the resin housing is made of photosensitive resin.

[0010] In some embodiments, the mesh line diameter of the three-dimensional mesh structure is 0.5mm to 1.5mm.

[0011] In some embodiments, the three-dimensional network structure is one or more of a regular lattice structure, a random porous structure, and a fractal network structure.

[0012] In some embodiments, the regular lattice structure is one or more of a cubic network structure, an octahedral network structure, and a diamond network structure.

[0013] In some embodiments, the outer side of the resin housing is provided with a resin connecting rod that connects to the tree support.

[0014] Compared with the prior art, the present invention has the following beneficial effects: This invention uses a hollow resin shell with a three-dimensional mesh structure to replace the traditional wax part, which can shorten the sample preparation cycle to 7 days, thereby improving the sample preparation efficiency and avoiding the problem of shell cracking during dewaxing, which would prevent the sample preparation from being completed. By setting several perforated columns that communicate with the hollow inner cavity, there are vents to allow the gas from the resin combustion to be discharged during baking (corresponding to the traditional dewaxing process), ensuring the quality of the shell. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a 3D printed resin mold for investment casting, as shown in an embodiment of the present invention. Figure 2 As shown in the embodiments of this utility model Figure 1 A partial structural perspective view. Detailed Implementation

[0016] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0017] It should be noted that when an element is said to be "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly on" another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0019] See Figure 1The present invention provides a 3D printed resin module for investment casting, comprising a resin shell 1, wherein the resin shell 1 is provided with a hollow inner cavity 2, and the hollow inner cavity 2 is provided with a three-dimensional mesh structure 3 formed of resin; and a plurality of perforated columns 4 communicating with the hollow inner cavity 2 are provided on the outer side of the resin shell 1.

[0020] In this embodiment, SLA-printed resin molds are used instead of traditional wax parts in the investment casting process. After repeated slurry impregnation to form a shell, the resin molds are fired instead of the traditional dewaxing process. The resin molds soften under high-temperature firing at 800℃~1000℃, and the three-dimensional network structure 3 breaks, forming cavities to provide collapse space for the resin shell 1. The resin shell 1 collapses and cracks inward under the reaction force of the outer shell mold, remaining inside the shell mold. During the 1~2h firing stage, it burns and vaporizes, and the vaporized gas is discharged through the pore column to prevent the vaporized gas from bursting the shell mold; and oxygen is replenished inside the shell mold to ensure that the resin burns completely and without residue.

[0021] Understandably, for larger castings, more perforated columns 4 can be provided to facilitate the discharge of vaporized resin and the replenishment of oxygen.

[0022] In some embodiments, the wall thickness of the resin shell 1 is 0.5 mm to 0.8 mm. Using a wall thickness within this range can ensure that the resin mold has a certain structural stability, shorten the firing stage for easier and faster gasification and decomposition, and avoid shell mold cracking due to thermal expansion differences.

[0023] In some embodiments, the perforated column 4 is sealed with wax to prevent ceramic slurry from entering the hollow inner cavity 2 during the resin mold impregnation and shell-making stage, thus preventing shell-making failure and ensuring that the inner cavity structure is clean and intact; at the same time, the wax can be burned and vaporized together with the resin during the firing stage or discharged from the through hole of the shell mold.

[0024] In some embodiments, the aperture of the orifice 4 is 6mm to 10mm. Using an orifice aperture within this range facilitates the rapid discharge of gaseous and liquid wax during dewaxing without affecting the overall structure of the resin mold.

[0025] In some embodiments, the perforated column 4 is adapted to a through hole on the shell mold, which is obtained by impregnating the resin shell with slurry. The resin shell 1 is immersed in ceramic slurry during the slurry impregnation stage. After the ceramic slurry has solidified into a shell mold, the shell mold slurry corresponding to the perforated column position is cut off to form a through hole, allowing the perforated column to communicate with the outside.

[0026] In some embodiments, the resin shell 1 is made of photosensitive resin. The photosensitive resin can be URT8801 or other known photosensitive resins to meet the requirements of calcination gasification.

[0027] In some embodiments, the mesh line diameter of the three-dimensional mesh structure 3 is 0.5mm to 1.5mm. Using a mesh line diameter within this range provides sufficient structural support while ensuring adequate air permeability.

[0028] In some embodiments, the three-dimensional mesh structure 3 is one or more of a regular lattice structure, a random porous structure, and a fractal mesh structure. The three-dimensional mesh structure 3 can be selected from various mesh structures to meet different shell-making requirements. The mechanical properties of a regular lattice structure are predictable, making it suitable for shell molds that withstand uniform loads; a random porous structure mimics the natural pore distribution, improving air permeability and heat dissipation, and reducing local stress concentration; a fractal mesh structure accelerates thermal decomposition and gas diffusion, making it suitable for complex cavities.

[0029] Optionally, the regular lattice structure is one or more of a cubic network structure, an octahedral network structure, and a diamond network structure.

[0030] In some embodiments, the outer side of the resin housing 1 is provided with a resin connecting rod 5 that is connected to the tree assembly support, so as to facilitate the splicing of multiple resin modules into a tree assembly.

[0031] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0032] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A 3D printed resin mold for investment casting, characterized in that, The device includes a resin shell with a hollow inner cavity, the hollow inner cavity having a three-dimensional mesh structure formed of resin; and the outer side of the resin shell having a plurality of perforated columns communicating with the hollow inner cavity.

2. The 3D printed resin mold for investment casting according to claim 1, characterized in that, The wall thickness of the resin shell is 0.5mm to 0.8mm.

3. The 3D printed resin mold for investment casting according to claim 1, characterized in that, The perforated column is sealed with wax.

4. The 3D printed resin mold for investment casting according to claim 3, characterized in that, The diameter of the perforated column is 6mm to 10mm.

5. The 3D printed resin mold for investment casting according to claim 4, characterized in that, The perforated column is adapted to the through hole on the shell mold, which is obtained by impregnating the resin shell with slurry.

6. The 3D printed resin mold for investment casting according to claim 1, characterized in that, The resin shell is made of photosensitive resin.

7. The 3D printed resin mold for investment casting according to claim 1, characterized in that, The diameter of the grid lines in the three-dimensional mesh structure is 0.5mm to 1.5mm.

8. The 3D printed resin mold for investment casting according to claim 7, characterized in that, The three-dimensional network structure is one or more of a regular lattice structure, a random porous structure, and a fractal network structure.

9. The 3D printed resin mold for investment casting according to claim 8, characterized in that, The regular lattice structure is one or more of the following: cubic network structure, octahedral network structure, and diamond network structure.

10. The 3D printed resin mold for investment casting according to claim 1, characterized in that, The outer side of the resin shell is provided with a resin connecting rod that connects to the tree support.

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