Ceramic core structure for precision investment casting

Abstract

The utility model provides a ceramic core structure for precision investment casting, which comprises a ceramic core body, the ceramic core body is provided with an extension column body extending out of a wax mould, an observation channel is arranged in the extension column body, and an opening of the observation channel is blocked by a cavity wall of the wax injection mould after the extension column body is arranged in the wax injection mould. And whether the ceramic core loses efficacy or not can be quickly judged by observing whether wax seepage exists in the channel or not.

Description

Technical Field

[0001] The utility model belongs to the technical field of investment precision casting, and in particular relates to a ceramic core structure. Background Art

[0002] High-temperature alloy investment castings are widely used in industry, particularly in the aviation industry. These complex cavities cannot be directly pressed from a mold; instead, a prefabricated ceramic core is required to create the complex cavity. Prior to wax injection, the ceramic core is placed in a wax mold, which then undergoes wax injection to create a wax pattern encasing the ceramic core. However, ceramic cores are prone to breaking during the wax injection process. In large-scale production, accurate and rapid determination of ceramic core failure is crucial. Utility Model Content

[0003] In order to solve the technical problem of whether a ceramic core becomes invalid during a wax injection process, the utility model provides a ceramic core structure for investment precision casting.

[0004] In order to achieve the purpose of this utility model, the technical solution adopted by this utility model is:

[0005] A ceramic core structure for investment casting includes a ceramic core body having an extended column extending out of a wax mold. An observation channel is provided inside the extended column. After the wax injection mold is installed, the opening of the observation channel is blocked by the cavity wall of the wax injection mold.

[0006] The utility model further comprises a positioning pin. The wax injection mold is provided with a positioning hole for accommodating the positioning pin. After the ceramic core is installed, one end of the positioning pin abuts against the ceramic core.

[0007] Preferably, the axial direction of the positioning pin is located at the opening and closing surface of the wax injection mold, and the positioning pin has a protruding pin cap, and the pin cap is just located outside the wax injection mold.

[0008] The beneficial effects of the present invention are:

[0009] 1. The utility model opens an observation channel in the extension column extending out of the wax mold. By observing whether there is wax seepage in the channel, it can be quickly determined whether the ceramic core is invalid. If there is no wax seepage, it means that the ceramic core is not broken and a qualified wax mold wrapped around the ceramic core is obtained.

[0010] 2. Use positioning pins to support and fix the ceramic core before performing wax injection to further ensure that the ceramic core does not shift or break. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a cross-sectional view of a ceramic core for investment casting of the utility model.

[0012] Figure 2 This is a structural diagram of the ceramic core of Example 2 being loaded into the wax injection mold.

[0013] Figure 3 This is a schematic diagram of the wax mold structure prepared in Example 2.

[0014] The markings in the figure are: 1. Ceramic core, 2. Wax mold, 3. Extension column, 4. Wax injection mold, 5. Positioning pin, 6. Pin cap, 21. Pin hole, 31. Observation channel, 41. Wax injection port. DETAILED DESCRIPTION

[0015] In order to more clearly and in detail illustrate the purpose and technical solution of the utility model, the utility model is further described below through relevant embodiments. The following embodiments are only for the purpose of specifically illustrating the implementation method of the utility model and do not limit the scope of protection of the utility model.

[0016] Example 1

[0017] like Figure 1 As shown, a ceramic core structure for investment casting includes a ceramic core body 1, wherein the ceramic core body 1 has an extension column 3 extending out of the wax mold 2, and an observation channel 31 is provided inside the extension column 3. After the wax injection mold 4 is installed, the opening of the observation channel 31 is blocked by the cavity wall of the wax injection mold 4.

[0018] Example 2

[0019] like Figure 1 As shown, a ceramic core structure for investment casting includes a ceramic core body 1, wherein the ceramic core body 1 has an extension column 3 extending out of the wax mold 2, and an observation channel 31 is provided inside the extension column 3. After the wax injection mold 4 is installed, the opening of the observation channel 31 is blocked by the cavity wall of the wax injection mold 4.

[0020] It also includes a positioning pin 5. The wax injection mold 4 is provided with a positioning hole for accommodating the positioning pin 5. After the ceramic core 1 is installed, one end of the positioning pin 5 abuts against the ceramic core 1.

[0021] like Figure 2 As shown, the ceramic core is supported and fixed with a locating pin 5, and then the wax injection operation is performed to further ensure that the ceramic core does not shift or break. After the locating pin is pulled out, the pin hole 21 left on the wax mold is filled with molten wax.

[0022] The axial direction of the positioning pin 5 is located at the opening and closing surface of the wax injection mold 4. The positioning pin 5 has a protruding pin cap 6, and the pin cap 6 is just located outside the wax injection mold 4. The protruding pin cap 6 is provided to make it easier to pull out the positioning pin 5 by hand.

[0023] The above-described embodiments merely represent specific implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A ceramic core structure for investment casting, characterized by: The ceramic core comprises an extension column extending out of the wax mold, an observation channel is arranged inside the extension column, and after the wax injection mold is installed, the opening of the observation channel is blocked by the cavity wall of the wax injection mold.

2. The ceramic core structure for investment casting according to claim 1, characterized in that: It also includes a positioning pin. The wax injection mold is provided with a positioning hole for accommodating the positioning pin. After the ceramic core is installed, one end of the positioning pin abuts against the ceramic core.

3. The ceramic core structure for investment casting according to claim 2, characterized in that: The axial direction of the positioning pin is located at the opening and closing surface of the wax injection mold. The positioning pin has a protruding pin cap, and the pin cap is just located outside the wax injection mold.

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