A method for filling and coating narrow grooves and deep holes in investment casting.

Abstract

This application discloses a method for filling and coating narrow grooves and deep holes in investment casting, including a filling and coating process to form a well-ventilated casting shell. Because the breathable and high-temperature resistant filler, composed of high-temperature resistant sponge, fills the narrow grooves or deep holes in the irregular flow channels of the casting shell, the casting shell has good breathability, preventing fire escape and solving the problem of poor permeability of ceramic cores that prevents gas from escaping from irregular flow channels during casting.

Description

Technical Field

[0001] This invention relates to a method for filling and coating narrow grooves and deep holes in castings during investment casting, belonging to the technical field of casting preparation methods. Background Technology

[0002] When casting wax patterns are coated with sand and formed into shells, and then investment casting is carried out to construct castings, in order to prevent fire from occurring when molten metal is poured into the casting shell, the narrow grooves or deep holes in the irregular flow channels of the shell need to be plugged.

[0003] Existing technologies for sealing areas use ceramic cores, such as the Chinese patent publication number CN109175288A, which describes a device for sealing the dewaxing port of a centrifugal investment casting mold shell and its usage method. The dewaxing port mold is equipped with a matching plug mold, which is a ceramic plug. Although ceramic cores can block narrow grooves or deep holes, their poor permeability prevents the gas in irregularly shaped channels from being discharged during casting. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a method for filling and coating narrow grooves and deep holes in castings in investment casting.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a method for filling and coating narrow grooves and deep holes in castings in investment casting, comprising: a filling and coating process for forming a casting shell with good air permeability.

[0007] The filling and coating process involves installing a breathable, high-temperature resistant filler into the narrow grooves or deep holes on the sidewalls of the cast shell at the irregular flow channel.

[0008] The breathable and high-temperature resistant filler is coated onto the cast shell through a coating layer.

[0009] The coating layer consists of three layers.

[0010] The breathable and high-temperature resistant filler can be a high-temperature resistant sponge such as quartz sponge.

[0011] The breathable and high-temperature resistant filler is a high-temperature resistant sponge with a porosity of 10ppi to 20ppi.

[0012] The breathable and high-temperature resistant filler is a high-temperature resistant sponge with a porosity of 25ppi to 30ppi.

[0013] The casting-type shell has irregularly shaped flow channels, and narrow grooves or deep holes are located at the irregularly shaped flow channels. The narrow grooves or deep holes are filled with a breathable and high-temperature resistant filler made of high-temperature resistant sponge.

[0014] The beneficial effects of this invention are as follows: because the breathable and high-temperature resistant filler made of high-temperature resistant sponge fills the narrow grooves or deep holes in the irregular flow channels of the casting shell, the casting shell has good air permeability and avoids fire, thus solving the problem that the ceramic core has poor air permeability and cannot discharge the gas in the irregular flow channels during casting. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the distribution of the present invention;

[0016] In the figure: 1-cast shell; 11-irregular flow channel; 12-narrow groove; 13-deep hole; 2-breathable high-temperature resistant filler; 3-coating layer. Detailed Implementation

[0017] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0018] like Figure 1 As shown.

[0019] This application discloses a method for filling and coating narrow grooves and deep holes in investment castings, comprising:

[0020] A breathable, high-temperature resistant filler 2 is installed in the narrow groove 12 or deep hole 13 on the side wall of the casting shell 1 at the irregular flow channel 11. The breathable, high-temperature resistant filler 2 is coated and fixed onto the casting shell 1 by a three-layer coating layer 3, thereby forming a casting shell 1 with good air permeability. The breathable, high-temperature resistant filler 2 can be a high-temperature resistant sponge such as quartz sponge. The coating layer 3 is composed of existing casting refractory coatings.

[0021] The breathable and high-temperature resistant filler 2 is made of two different high-temperature resistant sponges with a porosity of 10ppi to 20ppi or 25ppi to 30ppi. The high-temperature resistant sponge with a porosity of 10ppi to 20ppi is suitable for the wider narrow groove 12 or deep hole 13, while the high-temperature resistant sponge with a porosity of 25ppi to 30ppi is suitable for the narrow groove 12 or deep hole 13. This ensures that the breathable and high-temperature resistant filler 2 has both strength and breathability.

[0022] The casting shell 1, which is made of sand-based sintered material, has an irregularly shaped flow channel 11. There is a narrow groove 12 or a deep hole 13 at the irregularly shaped flow channel 11. The narrow groove 12 or the deep hole 13 is filled with a breathable and high-temperature resistant filler 2 made of high-temperature resistant sponge.

[0023] Because the breathable and high-temperature resistant filler 2, made of high-temperature resistant sponge, is filled in the narrow groove 12 or deep hole 13 in the irregular flow channel 11 of the casting shell 1, the casting shell 1 has good air permeability and avoids fire run-out, thus solving the problem that the ceramic core has poor air permeability and cannot discharge the gas in the irregular flow channel during casting.

Claims

1. A method for filling and coating narrow grooves and deep holes in investment casting, characterized in that, include: The filling and coating process of the casting shell (1); The filling and coating process involves installing a breathable and high-temperature resistant filler (2) in the narrow groove (12) or deep hole (13) on the side wall of the cast shell (1) at the irregular flow channel (11); The breathable and high-temperature resistant filler (2) is coated onto the casting shell (1) through a coating layer (3); The casting-type shell (1) has an irregular flow channel (11), and there is a narrow groove (12) or a deep hole (13) at the irregular flow channel (11).

2. The filling and coating method as described in claim 1, characterized in that: The coating layer (3) consists of three layers.

3. The filling and coating method as described in claim 1, characterized in that: The breathable and high-temperature resistant filler (2) is a quartz sponge.

4. The filling and coating method as described in claim 3, characterized in that: The breathable and high-temperature resistant filler (2) is a quartz sponge with a porosity of 10ppi to 20ppi.

5. The filling and coating method as described in claim 3, characterized in that: The breathable and high-temperature resistant filler (2) is a quartz sponge with a porosity of 25ppi~30ppi.

6. The filling and coating method as described in claim 1, characterized in that: The narrow groove (12) or deep hole (13) is filled with a breathable and high-temperature resistant filler (2) made of quartz sponge.

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