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Preparation method of high surface smoothness titanium alloy fired mold precision casting

A technology of precision casting and smoothness, which is applied in the field of investment precision casting, which can solve the problems of less than 3.2 μm, which cannot be realized, and achieve the effects of reducing surface roughness, improving reliability, and improving the dimensional accuracy of castings

Active Publication Date: 2019-10-18
BAIMTEC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 invention discloses a method for preparing titanium alloy investment castings with high surface finish. The method comprises the following steps: investment model preparation simulation, investment model preparation, investment model repair, casting gating system design, investment mold preparation with gating system, Shell preparation, casting pouring, primary blasting, pickling, secondary blasting and surface polishing.

[0053] The specific process is as follows:

[0054] Step 1 Investment Pattern Preparation Simulation

[0055] 1.1 According to the three-dimensional model of the casting, design the investment model and mold model;

[0056] 1.2 Use numerical simulation software to divide the surface mesh and volume mesh to form an investment model with mesh and a mold model that can be used for simulation. The side length of the surface mesh and body mesh is ≤5mm to ensure that the wax Simulation accuracy;

[0057] 1.3 Set investment model simulation boundary ...

Embodiment 1

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

[0102] Step 1 Wax model preparation simulation

[0103] 1.1 According to the three-dimensional model of the casting, design the wax model and mold model;

[0104] 1.2 Use numerical simulation software to divide the surface grid and volume grid to form a wax model and mold model with grids that can be used for simulation. The side length of the surface grid and volume grid is 5mm to ensure that the wax model Analog accur...

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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 high surface smoothness titanium alloy fired mold precision casting. The preparation method comprisesthe following steps that fired mold preparation simulation is carried out; fired mold preparation is carried out; fired mold repairing is carried out; casting pouring system design is carried out; preparation of a fired mold with a pouring system is carried out; shell preparation is carried out; casting pouring is carried out; primary sand blowing is carried out; acid pickling is carried out; secondary sand blowing is carried out; and surface polishing is carried out. The method solves the problem that the surface roughness of the titanium alloy casting prepared by the fired mold precision casting method is high; and the performance and the using reliability of the casting can be improved by improving the surface quality of the titanium alloy casting.

Description

technical field [0001] The invention belongs to the technical field of investment precision casting and relates to the improvement of a preparation method of a titanium alloy investment precision casting with high surface finish. Background technique [0002] Titanium alloy precision castings are mainly prepared by the investment casting method. Fusible materials are used to prepare investment patterns, and then several layers of refractory materials are coated on the surface of the investment pattern to make shells, and the shells after removal of investment patterns are roasted to obtain stable The shell, and then use the shell to pour the 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 high requirements for the surface roughness, dimensional accuracy and reliability of the castings. The surface roughness of...

Claims

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Application Information

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Patent Type & Authority Applications(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