Centrifugal casting method for titanium alloy frame casting

Abstract

The invention relates to a centrifugal casting method for a titanium alloy frame casting. The centrifugal casting method comprises the shell preparation of the frame casting, furnace charging and centrifugal casting. The technical scheme is that the centrifugal rotating speed n is: n=299*(G / R[T0])<1 / 2>, wherein: n represents a centrifugal rotating speed, G represents a gravity multiple and R[T0] represents a centrifugal radius, and the gravity multiple (G) of the centrifugal casing of the titanium alloy casting is selected from 10 to 15; wherein: (1) for the casting with minimum wall thickness larger than 20mm, G is selected from 10 to15, (2) for the casting with minimum wall thickness of 10-20mm, G is selected from 15 to 20, (3) for the casting with minimum wall thickness of 3.5-10mm, G is selected from 20 to 30, and (4) for the casting with minimum wall thickness of 10-20mm, G is selected from 30 to 50. The invention effectively ensures that precise titanium alloy castings can be obtained, has a great significance on the guidance of the titanium alloy centrifugal casting technology, especially the parameters of the frame casting centrifugal casting technology, and can guide the development and the production of aerospace frame castings and all kinds of titanium alloy parts by using the centrifugal casting technology.

Description

technical field [0001] The invention relates to a precision casting method, in particular to a centrifugal casting method of a titanium alloy frame casting and a method for determining the centrifugal speed. Background technique [0002] Centrifugal casting is the most commonly used method for titanium alloy casting. The effect of centrifugal force can overcome the shortcoming of titanium alloy vacuum casting pressure head is small, and ensure that dense titanium castings are obtained. Centrifugal speed is an important parameter of centrifugal casting. If the speed is too small, the metal pressure head cannot be formed, the filling capacity is low, the feeding capacity is poor, and it is easy to cause defects such as insufficient pouring, cold shut, shrinkage porosity, etc., and the speed is too high to cause unstable metal injection. , Increased casting stress, severe composition segregation and other defects. [0003] At present, there are many methods for calculating the...

AI Technical Summary

Problems solved by technology

Centrifugal speed is an important parameter of centrifugal casting. If the speed is too small, the metal pressure head cannot be formed, the filling capacity is low, the feeding capacity is poor, and it is easy to cause defects such as insufficient pouring, cold shut, shrinkage porosity, etc., and the speed is too high to cause unstable metal injection. , increased casting stress, serious composition segregation and other defects

[0003] At present, there are many methods for calculating the centrifugal speed in actual production. The derived calculation formulas and empirical formulas are relatively complicated, and the application is relatively rigid and not very specific. Moreover, there are few calculation methods for the vacuum centrifugal casting speed of titanium alloy castings, which are generally used. In the formula, there is no reference range for the centrifugal parameters of titanium alloy castings, and the existing calculation method of centrifugal speed cannot meet the actual production requirements of titanium alloy castings

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