An inlay ceramic core wax mold and a molding method thereof

Abstract

The application discloses a kind of embedded ceramic core wax mould mould, including outer mould and core mould, pipe cavity castings are formed between the outer mould and core mould, the core mould includes left mould core rod and right mould core rod, the inside of the left mould core rod is equipped with dovetail clamping groove, the dovetail clamping groove is equipped with the core that can be mutually matched with the sharp corner on the pipe cavity castings;The forming method of the embedded ceramic core wax mould, including the following steps: S100, installation core;S200, mould closing;S300, wax injection;S400, shell and S500, sand cleaning;The application reduces the shell difficulty of complex inner cavity pipe structure product dead angle position of investment casting, eliminates redundancy operation such as manual batching and grouting, reduces labor intensity and shell cost, eliminates potential pollution risk of sand cleaning, solves hollow pipe cavity structure product shell and sand cleaning low-efficiency problem.

Description

Technical Field

[0001] This invention relates to the field of wax mold processing technology, specifically to an embedded ceramic core wax mold and its molding method. Background Technology

[0002] Investment casting can produce small to medium-sized parts of any complex shape, but it is less suitable for tubular structures, especially castings with small apertures and sharp dead angles in the internal cavity (such as...). Figure 2 As shown in the diagram, coatings and sand cannot easily penetrate the inner cavity of the pipe wall, resulting in insufficient mold shell strength, internal fire in the casting, and difficulty in forming. Similarly, steel shot is also difficult to spray into the inner cavity during the sand removal process, making sand removal difficult.

[0003] Meanwhile, the common method for forming the inner cavity of hollow complex tubular structures is to create 3-4 layers of shell and then fill them with self-hardening core material. This utilizes the self-hardening properties of the core material to ensure shell strength. However, the preparation and grouting process of the self-hardening core material is limited by the constraints of manual, on-the-spot operation, resulting in low efficiency and high costs, making it unsuitable for mass production. This invention aims to provide a design method that solves the difficulties in creating shells and removing sand from complex inner cavities in precision-cast tubular structures. Summary of the Invention

[0004] Therefore, the present invention provides an embedded ceramic core wax mold and its molding method to solve the above-mentioned defects in the prior art.

[0005] A molding method for an embedded ceramic core wax mold.

[0006] The molding method employs an embedded ceramic core wax mold, which includes an outer mold and a core mold. The tube casting is cast between the outer mold and the core mold. The core mold includes a left mold core rod and a right mold core rod. A dovetail groove is provided on the inner side of the left mold core rod. A core that can cooperate with the sharp dead corners on the tube casting is engaged in the dovetail groove.

[0007] The molding method includes the following steps:

[0008] S100, Mounting Core:

[0009] When designing the mold, a dovetail groove is reserved at the tail end of the left mold core rod. The separately made core that can cooperate with the dovetail groove and cooperate with the sharp dead corners on the tube casting is pushed into the dovetail groove on the left mold core rod, so that the inner side of the core is in close contact with the rubber pad.

[0010] S200, mold closing:

[0011] The left and right mold cores are joined and tightly fitted together under the action of the cylinder. At this time, the core is precisely positioned and clamped under the squeezing action of the right mold cores on both sides and the rubber pad. This completes the preparation work for the entire inner cavity of the wax model.

[0012] S300, wax injection:

[0013] After the outer mold of the mold is closed to the core mold, wax is injected into the mold cavity. After cooling for a certain period of time, the left mold core and the right mold core on both sides of the mold are automatically retracted under the action of the cylinder. The core is left in the sharp dead corner of the wax mold, forming an embedded ceramic core wax mold.

[0014] S400, Shell Making:

[0015] The tubular casting was coated, sanded, blown, and dried using the investment casting shell-making method.

[0016] S500, Sand Removal:

[0017] After the casting is completed, the core automatically collapses under the action of high-temperature molten steel, forming a sharp dead corner in the cavity casting. Then, the internal cavity can be cleaned by conventional operations such as shot blasting and sandblasting.

[0018] Preferably, the core is made of ceramic material.

[0019] Preferably, a rubber pad is installed on the inner side of the dovetail groove, and the core contacts the outer side of the rubber pad.

[0020] Preferably, the ceramic core contains ≥40% high zirconium powder.

[0021] The present invention has the following advantages:

[0022] This invention reduces the difficulty of shell making in the dead corners of complex internal cavity tubular structures in investment casting, eliminates redundant operations such as manual material preparation and grouting, reduces labor intensity and shell making costs, eliminates the potential pollution risk of sand removal, and solves the problem of inefficient shell making and sand removal for hollow tubular structures. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the molding method for the embedded ceramic core wax mold of the present invention;

[0024] Figure 2 This is a schematic cross-sectional view of the tubular casting of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the left mold core rod of the present invention;

[0026] Figure 4 This is a schematic diagram of the disassembled structure of the left mold core rod of the present invention.

[0027] In the picture:

[0028] 1-Cavity casting; 2-Sharp dead angle; 3-Core; 4-Rubber pad; 5-Left mold core rod; 6-Dovetail groove. Detailed Implementation

[0029] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0030] like Figures 2 to 4 As shown, this invention provides an embedded ceramic core wax mold, including an outer mold (not shown) and a core mold. A cavity casting 1 is cast between the outer mold and the core mold. The core mold includes a left mold core rod 5 and a right mold core rod (not shown). A dovetail groove 6 is formed on the inner side of the left mold core rod 5. A core 3 that can cooperate with the sharp dead corner 2 on the cavity casting 1 is engaged in the dovetail groove 6. A rubber pad 4 is installed on the inner side of the dovetail groove 6, and the core 3 contacts the outer side of the rubber pad 4.

[0031] The core 3 is made of ceramic. The ceramic core 3 contains ≥40% high zirconium powder.

[0032] A molding method for an embedded ceramic core wax mold, such as Figure 1 The steps shown are as follows:

[0033] S100, Mounting Core 3:

[0034] When designing the mold, a dovetail groove 6 is reserved at the tail of the left mold core rod 5. The separately made core 3 that can cooperate with the dovetail groove 6 and the sharp dead corner 2 on the tube casting 1 is pushed into the dovetail groove 6 on the left mold core rod 5, so that the inner side of the core 3 is in close contact with the rubber pad 4.

[0035] S200, mold closing:

[0036] The left mold core 5 and the right mold core 5 are joined and tightly fitted together under the action of the cylinder. At this time, the core 3 is precisely positioned and clamped under the squeezing action of the right mold core 5 and the rubber pad 4 on both sides. At this time, the preparation work for the entire inner cavity of the wax model is completed.

[0037] S300, wax injection:

[0038] After the outer mold of the mold is closed to the core mold, wax is injected into the mold cavity. After cooling for a certain period of time, the left mold core rod 5 and the right mold core rod on both sides of the mold are automatically retracted under the action of the cylinder. The core 3 is left in the sharp dead corner 2 position of the wax model (tube casting 1) to form an embedded ceramic core wax model.

[0039] S400, Shell Making:

[0040] The cavity casting 1 was coated, sanded, blown and dried in accordance with the investment casting shell making method. At this time, since the sharp dead corner 2 of the cavity casting 1 has been filled by the ceramic core 3, there is no need to consider the risk of insufficient coating and sanding in the dead corner, so the shell making difficulty is greatly reduced.

[0041] S500, Sand Removal:

[0042] After the casting is completed, the core 3 automatically collapses under the action of high temperature molten steel, and the sharp dead corner 2 of the tube casting 1 is formed. Then, the internal cavity can be cleaned by conventional operations such as shot blasting and sandblasting.

[0043] This invention reduces the difficulty of shell making in the dead corners of complex internal cavity tubular structures in investment casting, eliminates redundant operations such as manual material preparation and grouting, reduces labor intensity and shell making costs, eliminates the potential pollution risk of sand removal, and solves the problem of inefficient shell making and sand removal for hollow tubular structures.

[0044] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A method for molding an embedded ceramic core wax mold, characterized in that: The molding method adopts an embedded ceramic core wax mold, the mold includes an outer mold and a core mold, the cavity casting (1) is cast between the outer mold and the core mold, the core mold includes a left mold core rod (5) and a right mold core rod, the inner side of the left mold core rod (5) is provided with a dovetail groove (6), and a core (3) that can cooperate with the sharp dead corner (2) on the cavity casting (1) is provided on the dovetail groove (6); The molding method includes the following steps: S100, Mounting core (3): When designing the mold, a dovetail groove (6) is reserved at the tail end of the left mold core rod (5). The separately made core (3) that can cooperate with the dovetail groove (6) and cooperate with the sharp dead corner (2) on the tube casting (1) is pushed into the dovetail groove (6) on the left mold core rod (5) so that the inner side of the core (3) is in close contact with the rubber pad (4). S200, mold closing: The left mold core (5) and the right mold core are joined and tightly fitted under the action of the cylinder. At this time, the core (3) is precisely positioned and clamped under the squeezing action of the right mold cores on both sides and the rubber pad (4). At this time, the preparation work for the entire inner cavity of the wax mold is completed. S300, wax injection: After the outer mold of the mold is closed to the core mold, wax is injected into the mold cavity. After cooling for a certain period of time, the left mold core rod (5) and the right mold core rod on both sides of the mold automatically retract under the action of the cylinder. The core (3) is left in the sharp dead corner (2) position of the wax mold, forming an embedded ceramic core wax mold. S400, Shell Making: The cavity casting (1) was coated, sanded, blown and dried in accordance with the investment casting shell making method; S500, Sand Removal: After the casting is completed, the core (3) automatically collapses under the action of high temperature molten steel, and the sharp dead corner (2) of the tube casting (1) is formed. Then, the internal cavity can be cleaned by conventional shot blasting and sandblasting operations.

2. The molding method of an embedded ceramic core wax mold according to claim 1, characterized in that: The core (3) is made of ceramic material.

3. The molding method for an embedded ceramic core wax mold according to claim 1, characterized in that: A rubber pad (4) is installed on the inner side of the dovetail groove (6), and the core (3) contacts the outer side of the rubber pad (4).

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