High-quality forming method for wax mold containing ceramic core

Abstract

The invention provides a high-quality forming method of a wax mold containing a ceramic core, which is applied to the field of titanium alloy casting and mainly aims at the high-quality forming problem of the wax mold containing the ceramic core. According to the method, a method of splitting and halving a product wax mold is adopted for the part, which is easy to break due to relatively thin thickness and too low strength, of the ceramic mold core, the wax mold and the ceramic mold core are assembled with the ceramic mold core after being pressed respectively, finally, the wax mold is combined, and after combination, the size, shape and position precision of the product wax mold is verified by utilizing a scanning result through three-dimensional laser scanning. In this way, it can be ensured that the ceramic core is always kept intact in the shell preparation stage, and it is ensured that a casting inner cavity corresponding to the ceramic core can be formed in a high-quality mode.

Description

Technical Field

[0001] The invention belongs to the technical field of wax mold forming, and in particular relates to a high-quality forming method of a wax mold containing a ceramic core, which is mainly used in the field of shell preparation of aerospace titanium alloy castings. Background Art

[0002] In recent decades, with the development of the national defense industry, the frequency of use of titanium alloys has increased significantly. With its low density and corrosion resistance, it has gradually replaced steel materials in some fields. However, due to the rapid development and continuous innovation of science and technology, many fields have higher and higher requirements for the service environment of titanium alloy castings, resulting in the diversification and complexity of the structures of many titanium alloy castings. Complex thin-walled cavity castings are typical diverse and complex castings. This type of casting is destined to bring greater difficulty to its forming due to its structural complexity, and also puts higher requirements on the production and development of castings.

[0003] For complex thin-walled titanium alloy castings, it is difficult to complete the shell preparation through the traditional shell making process alone due to the multi-cavity or multi-pore internal structure. The assistance of the core is required to form the thin-walled complex internal cavity or small hole structure with high quality. However, some ceramic cores are thin and have low strength. They are broken by the impact of wax liquid during the wax pressing process, which affects the shell quality. Summary of the invention

[0004] In view of this, in order to solve the technical problems mentioned in the above background technology, the present invention proposes a high-quality forming method containing a ceramic core wax mold. The implementation of this scheme can greatly improve the forming quality of the wax mold containing a ceramic core, and provide new ideas for the manufacturing process of titanium alloy castings that use ceramic cores to complete shell making in various fields.

[0005] To achieve the above object, the present invention adopts the following technical scheme: a high-quality forming method containing a ceramic core wax mold, specifically comprising the following steps:

[0006] Step 1: Divide the wax model into two wax model components: wax model component a and wax model component b;

[0007] Step 2: After the two wax model components are pressed into shape, a ceramic core that conforms to the shape of the thin-walled inner cavity is assembled between the wax model component a and the wax model component b, and then the ceramic core is pasted on the wax model component b;

[0008] Step 3: Finally, stick the wax model component a to the corresponding position on the outside of the ceramic core to complete the mold with the wax model component b.

[0009] Step 4: To ensure the dimensional and positional accuracy of the wax mold, perform a 3D laser scan on the product wax mold after assembly. The scan result is compared with the theoretical model of the product wax mold to ensure that its dimensional and positional accuracy meets the subsequent machining requirements. After the size is confirmed to be correct, enter the shell preparation stage, and clean out the ceramic core during the shell cleaning stage after smelting and pouring.

[0010] Compared with the prior art, the high-quality forming method of the ceramic core wax mold described in the present invention has the following beneficial effects:

[0011] The present invention performs mold splitting processing on the position where the product wax mold is assembled with the ceramic core, and respectively presses out the two parts of the product wax mold after mold splitting, first assembles the ceramic core at the corresponding position of one of the components, and finally welds and assembles the other wax mold component at the opposite side to complete the mold closing. In this way, the occurrence of ceramic core cracking due to the impact of wax liquid on the ceramic core can be avoided, and the preparation of the product wax mold can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0013] Figure 1 It is a schematic diagram of the structure of the thin-wall inner cavity of the present invention;

[0014] Figure 2 It is a structural schematic diagram of the ceramic core of the present invention;

[0015] Figure 3 It is a schematic diagram of the structure after the wax model component a and the wax model component b are separated;

[0016] Figure 4 It is a schematic diagram of the structure for assembling the ceramic core;

[0017] Figure 5 A schematic diagram of the structure of the wax model component a, the ceramic core and the wax model component b completing the mold;

[0018] In the figure: 1-thin-wall inner cavity, 2-ceramic core, 3-wax mold component a, 4-wax mold component b. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0020] See also Figure 1-5The present embodiment is described as a high-quality forming method of a wax mold containing a ceramic core, specifically comprising the following steps:

[0021] Step 1: Divide the wax model into two wax model components: wax model component a3 and wax model component b4.

[0022] Step 2: After the two wax model components are pressed into shape respectively, a ceramic core 2 conforming to the shape of the thin-walled inner cavity 1 is assembled between the wax model component a3 and the wax model component b4, and then the ceramic core 2 is pasted on the wax model component b4.

[0023] Step 3: Finally, stick the wax model component a3 to the corresponding position on the outside of the ceramic core 2 to complete the mold closing with the wax model component b4.

[0024] Step 4: To ensure the dimensional accuracy of the wax model, the product wax model is scanned by 3D laser after assembly. The scanning results are compared with the theoretical model of the product wax model to ensure that its dimensional accuracy meets the requirements of subsequent machining. After the size is confirmed to be correct, the shell preparation stage is entered. The ceramic core is cleaned out during the shell cleaning stage after smelting and pouring.

[0025] The present invention takes a test piece (hereinafter referred to as "P00") as an example to introduce the shell preparation process of such a product in the front-end casting process.

[0026] P00 The specimen has a thin-walled cavity 1 (such as Figure 1 ) is difficult to form. According to the previous shell making method for such castings, it is only necessary to assemble a conformable ceramic core 2 in the thin-walled inner cavity to assist in forming. However, due to the thin inner cavity, the thinnest thickness is only 10mm, and it is extremely easy to break under the impact of wax liquid.

[0027] To solve this problem, the present invention proposes to perform mold splitting at the position where the product wax mold is assembled with the ceramic core 2, and the two parts of the product wax mold after mold splitting (wax mold component a and wax mold component b) are pressed out respectively (such as Figure 3 As shown), the ceramic core 2 is first assembled in the corresponding position of one of the components (wax mold component b) (as shown in FIG. Figure 4 As shown), finally, another wax mold component (wax mold component a) is welded and assembled on the opposite side to complete the mold closing. This can not only avoid the occurrence of ceramic core cracking due to the impact of wax liquid on the ceramic core, but also realize the preparation of the product wax mold.

[0028] like Figure 2 As shown, in order to ensure the wax pressing forming of the P00 test piece, a ceramic core 2 needs to be installed at the corresponding position of the thin-walled inner cavity 1 of the product wax mold. In order to prevent the ceramic core 2 from being impacted by the wax liquid, the present invention splits the product wax mold.

[0029] like Figure 3After demolding, the wax mold is divided into two parts: wax mold component a3 and wax mold component b4.

[0030] like Figure 4 After the two wax model components are pressed into shape, a ceramic core 2 that conforms to the shape of the thin-walled inner cavity 1 is assembled between the wax model component a3 and the wax model component b4, and then the ceramic core 2 is pasted on the wax model component b4.

[0031] like Figure 5 Finally, the wax model component a3 is pasted to the corresponding position on the outside of the ceramic core 2 to complete the mold closing with the wax model component b4.

[0032] The present invention adopts the method of splitting the product wax mold into two halves for the parts of the ceramic core that are easy to break due to the thin thickness and low strength, and then assembling the wax mold and the ceramic core after the wax mold and the ceramic core are pressed separately, and finally merging the wax mold, and after merging, the dimensional shape and position accuracy of the product wax mold is verified by the scanning results of three-dimensional laser scanning. In this way, the ceramic core can be kept intact at all times during the shell preparation stage, and the corresponding casting cavity can be formed with high quality.

[0033] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well.

Claims

1. A high quality forming method of a wax mold containing a ceramic core, characterized in that: The specific steps include: Step 1: Divide the wax model into two wax model components: wax model component a (3) and wax model component b (4); Step 2: After the two wax model components are pressed into shape, a ceramic core (2) conforming to the shape of the thin-walled inner cavity (1) is assembled between the wax model component a (3) and the wax model component b (4), and then the ceramic core (2) is glued to the wax model component b (4); Step 3: Finally, the wax model component a (3) is pasted to the corresponding position on the outside of the ceramic core (2) to complete the mold closing with the wax model component b (4).

2. The high quality forming method of a wax mold containing a ceramic core according to claim 1, characterized in that: Step 4: To ensure the dimensional and positional accuracy of the wax model, the product wax model is subjected to three-dimensional laser scanning after assembly. The scanning result is compared with the theoretical model of the product wax model to ensure that its dimensional and positional accuracy meets the requirements of subsequent machining. After the size is confirmed to be correct, the shell preparation stage is entered. The ceramic core (2) is cleaned out during the shell cleaning stage after smelting and pouring.

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