Method for realizing casting variable withdrawing rate in directional solidification casting
A technology of drawing rate and directional solidification, which is applied in the field of variable drawing rate of molds in directional solidification casting, and can solve the problems of the adverse effects of mass production of directional solidification castings and the inability to quantitatively give the law of drawing rate influence, etc.
Active Publication Date: 2015-07-01
XI AN JIAOTONG UNIV
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Problems solved by technology
Second, after studying the influence of the change of drawing rate of several superalloys on their microstructure and mechanical properties, it was found that the microstructure and properties of different superalloys showed similar laws with the change of drawing rate, but there were Their respective characteristics cannot quantitatively give a unified law of the influence of the drawing rate
This has a detrimental effect on the serial production of directional solidified castings
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[0100] A specific system design example is given below.
[0101] 1. Introduction to Electrical Principles
[0102] The electrical principle of the drawing rate automatic control system is as follows: Figure 4 shown. The input of the system is the temperature measured by the thermocouple, which is converted into a voltage by the hot spot effect of the thermocouple, and then through the extension wires A' and B', and the automatic control input voltage U is obtained after using the compensation bridge. i , the output is the drawing rate setting system voltage U of the directional solidification furnace o . This system uses two operational amplifiers μA741, the first one is to amplify after the thermocouple reads the temperature and voltage, which constitutes the PID correction link of the input voltage part, and improves the static and dynamic performance of the system; The post-voltage amplification constitutes the PI correction link of the automatic control system, which ...
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Abstract
The invention provides a method for realizing casting variable withdrawing rate in directional solidification casting. The method includes: using a temperature measuring instrument to measure the time-temperature curve of a high-temperature alloy cast in directional solidification casting, and obtaining the instant growth rate, in the directional crystal growth direction, of the high-temperature alloy cast; obtaining the required withdrawing rate, at certain coordinates in the directional crystal growth direction, of the high-temperature alloy cast according to the relation of the withdrawing rate and the instant growth rate; adjusting the casting withdrawing rate in real time according to the obtained required withdrawing rate. By the method, the temperature gradient and growth rate of high-temperature alloy cast in directional solidification casting can be measured in real time, and the accordingly the required casting withdrawing rate can be obtained along with the change of the temperature gradient during directional solidification, and the easy manufacturing of the high-temperature alloy cast is achieved. In addition, the manufactured high-temperature alloy cast is even in texture and good in performance.
Description
【Technical field】 [0001] The invention belongs to the technical field of directional solidification manufacturing, and in particular relates to a method for realizing variable drawing speed of a mold in directional solidification casting. 【Background technique】 [0002] Directional solidification casting is a forced solidification process. The principle is that the upper heating zone and the lower cooling zone of the directional solidification furnace are separated by a thermal insulation baffle to form a one-dimensional temperature gradient along the axial direction of the superalloy casting. The superalloy casting The upper part is melted and overheated, the lower part is forced to cool, and the solidification interface is located near the heat insulation baffle, and the solidification structure arranged in one direction is realized by pulling down. In the process of directional solidification, the drawing rate of the mold during directional solidification has an important...
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IPC IPC(8): B22D27/04
Inventor 李涤尘廉媛媛鲁中良
Owner XI AN JIAOTONG UNIV