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A kind of preparation method of titanium alloy investment casting precision casting with high surface finish

A precision casting and smoothness technology, which is applied in the field of investment precision casting, can solve problems such as being unrealizable and less than 3.2 μm, and achieve the effects of improving reliability, reducing surface roughness, and reducing the defect rate of castings

Active Publication Date: 2021-07-16
BAIMTEC MATERIAL CO LTD
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AI Technical Summary

Problems solved by technology

Since titanium alloy castings are mainly used in the aerospace field, they have high requirements for the surface roughness, dimensional accuracy and reliability of the castings. The surface roughness of the castings is related to the matching properties, wear resistance and fatigue strength of the products. , contact stiffness, vibration and noise are closely related, and have an important impact on the service life and reliability of the product. Therefore, the surface roughness of titanium alloy castings is required to be less than 3.2 μm, which is required for key castings or key areas of castings. The surface roughness is even lower than 1.6μm, which cannot be achieved by conventional investment casting methods

Method used

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preparation example Construction

[0052] The present invention is a method for preparing a high surface finish titanium alloy investment mold precision casting, which comprises the following steps: investment mold preparation simulation, investment mold preparation, investment mold repair, casting pouring system design, investment mold preparation with a pouring system, Shell preparation, casting casting, primary blasting, pickling, secondary blasting and surface polishing.

[0053] The specific process is as follows:

[0054] Step 1 Investment Preparation Simulation

[0055] 1.1 Design the investment model and mold model according to the 3D model of the casting;

[0056] 1.2 Use numerical simulation software to divide surface meshes and volume meshes to form investment models and mold models with meshes that can be used for simulation. The side lengths of the surface meshes and volume meshes are ≤5mm to ensure that the wax Die simulation accuracy;

[0057] 1.3 Set the boundary parameters of investment simu...

Embodiment 1

[0101] A ring-shaped titanium alloy investment casting precision casting, the casting size is φ1135×300mm. The overall surface roughness of the casting is required to be less than Ra≤1.6μm. The investment model uses a wax model. The method includes the following steps: wax model preparation simulation, wax model preparation, wax model repair, casting casting system design, wax model preparation with casting system, mold shell preparation, casting casting, primary sand blowing, pickling, and secondary blowing Sand and surface finish. The preparation method is as follows:

[0102] Step 1 Wax Model Preparation Simulation

[0103] 1.1 According to the 3D model of the casting, design the wax model and mold model;

[0104] 1.2 Use numerical simulation software to divide surface mesh and volume mesh to form wax model and mold model with mesh that can be used for simulation. The side length of the surface mesh and volume mesh is 5mm to ensure the wax model. Simulation accuracy; ...

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PUM

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Abstract

The invention belongs to the technical field of casting, and relates to a preparation method of a titanium alloy investment precision casting with high surface finish. The preparation method includes the following steps: investment pattern preparation simulation, investment pattern preparation, investment pattern repair, casting gating system design, investment pattern preparation with gating system, mold shell preparation, casting pouring, primary sand blasting, pickling, secondary Sand blasting and surface polishing. The method solves the problem of high surface roughness of the titanium alloy casting prepared by the investment precision casting method, and improves the performance and service reliability of the casting by improving the surface quality of the titanium alloy casting.

Description

technical field [0001] The invention belongs to the technical field of investment mold precision casting, and relates to an improvement on a preparation method of a titanium alloy investment mold precision casting with high surface finish. Background technique [0002] Titanium alloy precision castings are mainly prepared by investment casting method, using fusible materials to prepare investment molds, and then coating the surface of the investment mold with several layers of refractory materials to form shells, and roasting the shells after the investment molds are removed to obtain stable shell, and then use the shell for casting casting. At present, the surface roughness of titanium alloy castings prepared by investment casting method is between 3.2 and 6.3 μm. Since titanium alloy castings are mainly used in the aerospace field, they have higher requirements on the surface roughness, dimensional accuracy and reliability of the castings. , contact stiffness, vibration ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C7/02B22C9/04B22C9/18
CPCB22C7/02B22C9/04B22C9/18
Inventor 张美娟郄喜望南海
Owner BAIMTEC MATERIAL CO LTD
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