Ceramic plug for blocking the dewaxing opening of a mold shell and method of application

Abstract

The application discloses a ceramic plug for blocking a wax removal opening of a mold shell and an application method thereof. The application method of the ceramic plug for blocking the wax removal opening of the mold shell comprises the following steps: blocking the wax removal opening of the mold shell, and not damaging the mold shell in the application process. A plurality of stress convex bodies which are spaced apart from each other and are arranged at two axial ends of a ceramic plug body are wrapped by a mold shell, so that stress can be dispersed, and when a male thread of the ceramic plug body is screwed with a threaded hole in the ceramic plug body, the mold shell of the wax removal opening is not easy to be damaged, and the problem that the sand shell body of the inner cavity is easy to be damaged due to stress concentration when the sand shell body is put into or taken out of the inner cavity opening is solved.

Description

Technical Field

[0001] This invention relates to a ceramic plug for sealing the dewaxing port of a mold shell and its application method, belonging to the field of casting technology. Background Technology

[0002] For medium to large sand mold shells, due to their large outline and complex structure, multiple dewaxing ports need to be opened at the lowest point and large flat surface. This ensures clean dewaxing while preventing the mold shell from swelling and cracking due to slow wax removal. After dewaxing and firing, the dewaxing ports need to be sealed.

[0003] Existing sealing techniques for dewaxing openings, such as the multi-cavity ceramic mold shell and its forming method disclosed in Chinese Patent Publication No. CN105081220B, involve filling and sealing the inner cavity of the upper section A of the support column of the multi-cavity ceramic mold shell with an upper plug A after firing, and filling and sealing the inner cavity of the lower section A of the support column with a lower plug A. Although plugs can seal the inner cavity opening of the multi-cavity ceramic mold shell, the outer surface of the inner cavity is just a sand mold shell. When plugs are inserted into or removed from the inner cavity opening, the stress concentration can easily damage the sand mold shell at the inner cavity. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a ceramic plug for sealing the dewaxing port of a mold shell and its application method.

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

[0006] The present invention provides a method for applying a ceramic plug for sealing the dewaxing port of a mold shell, comprising:

[0007] This includes the application process of using ceramic plugs to seal the dewaxing port of the mold shell without damaging the mold shell.

[0008] The application process includes three steps performed sequentially: dewaxing and gating, wax mold assembly and shell making, and dewaxing.

[0009] The dewaxing channel is manufactured as follows: using a ceramic plug as a base, wax is pressed onto the ceramic plug to form a dedicated dewaxing channel.

[0010] The wax mold assembly shell-making steps are as follows: the ceramic plug mother body is assembled and spliced ​​with the dewaxing port of the module wax mold through the dewaxing special gating channel. Then, the wax part is cleaned to the design size. At this time, the ceramic plug mother body is fixed on the module wax mold through the dewaxing special gating channel. Then, sand is attached to the module with the dewaxing special gating channel to make a sand shell. At this time, the sand shell covers the stress protrusions on the upper and lower shaft end faces of the ceramic plug mother body.

[0011] The dewaxing step is as follows: the sand shell is cut at a distance of 1-3mm from the bottom surface of the lower end of the stress-bearing protrusion of the ceramic plug mother body. Since there is a distance between the horizontal cutting line and the bottom surface of the lower end of the stress-bearing protrusion of the ceramic plug mother body, the sand shell wrapped around the outside of the ceramic plug mother body will not be damaged. After heating, the dewaxing special sprue and the wax mold of the module melt, and the wax liquid is discharged from the threaded through hole inside the ceramic plug mother body. The external thread of the ceramic plug male and the wax liquid are screwed together from the threaded through hole inside the ceramic plug mother body to seal the dewaxing port.

[0012] The ceramic plug for sealing the dewaxing port of the mold shell includes:

[0013] A ceramic plug housing is integrally formed and fixed with the module sand mold shell; the ceramic plug housing has threaded through holes inside.

[0014] The male ceramic plug has external threads that engage with the threaded through-hole inside the female ceramic plug.

[0015] The ceramic plug body has multiple spaced force-bearing protrusions integrally fixedly connected to both ends of the axial direction. When the module wax mold is coated with sand to form a sand shell, the force-bearing protrusions play a role in strengthening the connection and restricting the rotation of the ceramic plug body and the module sand shell.

[0016] The beneficial effects of this invention are as follows: the multiple spaced force-bearing protrusions at both ends of the ceramic plug body are wrapped by the module shell, which can disperse the force. When the external thread of the ceramic plug male engages with the wax liquid through the threaded through hole inside the ceramic plug body, the module shell of the dewaxing port is not easily damaged. This solves the problem in the prior art where the outer surface of the inner cavity is just a sand mold shell, and the sand mold shell in the inner cavity is easily damaged when the plug is inserted or removed from the inner cavity. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the ceramic plug mother body of the present invention;

[0018] Figure 2 This is a schematic front cross-sectional view of the ceramic plug body of the present invention;

[0019] Figure 3 This is a schematic front view of the ceramic plug male body of the present invention;

[0020] Figure 4 This is a schematic diagram of the main cross-section of the dewaxing special runner and the ceramic plug mother body of the present invention;

[0021] Figure 5 This is a front view schematic diagram of the dewaxing special gating system with ceramic plug mother body and the module wax part forming of the present invention;

[0022] In the diagram: 1-Ceramic plug body; 11-Threaded through hole; 12-Force-bearing protrusion; 2-Ceramic plug male body; 21-External thread; 3-Module; 4-Dewaxing special runner; 5-Horizontal cutting line. Detailed Implementation

[0023] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0024] like Figures 1 to 5 As shown.

[0025] This application discloses a ceramic plug for sealing the dewaxing port of a mold shell, comprising:

[0026] The ceramic plug mother body 1 is made of ceramic material. When in use, the ceramic plug mother body 1 is integrally formed and fixed with the sand mold shell of the module 3. The ceramic plug mother body 1 has a threaded through hole 11 inside. Multiple spaced force-bearing protrusions 12 are integrally fixedly connected to both ends of the ceramic plug mother body 1 along the axial direction. When the wax mold of the module 3 is coated with sand to form the sand mold shell, the force-bearing protrusions 12 play a role in strengthening the connection and restricting the rotation of the ceramic plug mother body 1 and the sand mold shell of the module 3.

[0027] The ceramic plug male body 2 is made of ceramic material, and the external thread 21 of the ceramic plug male body 2 is screwed into the threaded through hole 11 inside the ceramic plug female body 1.

[0028] The present application method of a ceramic plug for sealing the dewaxing port of a mold shell includes:

[0029] Step 1, Dewaxing runner fabrication: Based on the ceramic plug matrix 1, wax material is pressed onto the ceramic plug matrix 1 to form a dewaxing runner 4;

[0030] Step 2, Wax mold assembly and shell making: The ceramic plug mother body 1 is assembled and spliced ​​with the dewaxing port of the wax mold of module 3 through the dewaxing special gating channel 4. Then, the wax part is cleaned to the design size. At this time, the ceramic plug mother body 1 is fixed on the wax mold of module 3 through the dewaxing special gating channel 4. Then, sand is attached to the module 3 with the dewaxing special gating channel 4 to make a sand shell. At this time, the sand shell covers the stress protrusions 12 on the upper and lower shaft end faces of the ceramic plug mother body 1.

[0031] Step 3, Dewaxing: Cut the sand shell at a distance of 1-3mm from the bottom surface of the lower end force-bearing protrusion 12 of the ceramic plug mother body 1. Since the horizontal cutting line 5 produced by the cutting is at a distance from the bottom surface of the lower end force-bearing protrusion 12 of the ceramic plug mother body 1, it will not damage the sand shell wrapped around the outside of the ceramic plug mother body 1. After heating, the dewaxing special sprue 4 and the wax mold of the module 3 melt, and the wax liquid is discharged from the threaded through hole 11 inside the ceramic plug mother body 1. The external thread of the ceramic plug male body 2 and the wax liquid are screwed into the threaded through hole 11 inside the ceramic plug mother body 1 to seal the dewaxing port.

[0032] When the male ceramic plug 2 is screwed in, the multiple spaced force-bearing protrusions 12 at both ends of the axial direction of the female ceramic plug 1 are wrapped by the shell of the module 3, which can disperse the force. This makes it less likely for the shell of the module 3 at the dewaxing port to be damaged when the external thread of the male ceramic plug 2 is screwed in with the wax liquid through the threaded through hole 11 inside the female ceramic plug 1. This solves the problem in the prior art where the outer part of the inner cavity is just a sand mold shell, and the sand mold shell at the inner cavity is easily damaged when the plug is inserted or removed from the inner cavity.

Claims

1. A method of using a ceramic plug for plugging a casing off-dewaxing port, characterized in that, The application relates to a ceramic plug for sealing a wax-drawing opening of a wax-drawing mold, and a sealing process of the ceramic plug. The application process comprises three steps of wax-drawing runner production, wax-mold assembly and wax-drawing in sequence. The wax-drawing runner production step is based on a ceramic plug body (1), and wax is pressed on the ceramic plug body (1) to form a wax-drawing special runner (4). The wax-mold assembly step is that the ceramic plug body (1) is combined and spliced with a wax-drawing opening of a wax-mold of a mold assembly (3) through the wax-drawing special runner (4), and then the wax assembly is cleaned to a design size; at this time, the ceramic plug body (1) is fixed on the wax-mold of the mold assembly (3) through the wax-drawing special runner (4), and sand shell production is carried out on the mold assembly (3) with the wax-drawing special runner (4); at this time, the sand shell wraps stress convex bodies (12) on upper and lower axial end faces of the ceramic plug body (1). When the ceramic plug body (2) is screwed, the stress convex bodies (12) distributed at intervals on the two axial ends of the ceramic plug body (1) are wrapped by the mold shell (3) and can disperse stress. The wax-drawing step is that the sand shell at a distance of 1-3 mm from the bottom surface of the lower end stress convex body (12) of the ceramic plug body (1) is cut; since there is a distance between the horizontal cutting line (5) generated by cutting and the bottom surface of the lower end stress convex body (12) of the ceramic plug body (1), the sand shell wrapped outside the ceramic plug body (1) is not damaged; after heating, the wax-drawing special runner (4) and the wax-mold of the mold assembly (3) are melted, the wax liquid is discharged from the threaded hole (11) inside the ceramic plug body (1), the external thread of the ceramic plug body (2) is screwed with the wax liquid from the threaded hole (11) inside the ceramic plug body (1), and the wax-drawing opening is sealed.

2. The method of using the ceramic plug to plug the de-waxing port of the formwork according to claim 1, wherein: The application further relates to a ceramic plug body (1) integrally formed with a mold assembly (3) sand shell, and a ceramic plug body (2).

3. A ceramic plug for plugging a de-waxing port of a formwork according to any one of claims 1 to 2, characterized in that: The ceramic plug body (1) is integrally connected with a plurality of stress convex bodies (12) distributed at intervals on the two axial ends; when the mold assembly (3) wax-mold is sand-attached to form a sand shell, the stress convex bodies (12) play a role in strengthening connection and limiting rotation of the ceramic plug body (1) and the mold assembly (3) sand shell. The ceramic plug body (1) is internally provided with a threaded hole (11); and the ceramic plug body (2) is externally provided with an external thread (21) screwed with the threaded hole (11) inside the ceramic plug body (1).

4. The ceramic plug for closing off the dewaxing port of a formwork according to claim 3, characterized in that: ​

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