Method for casting and forming TiAl-based alloy vent valve

A casting forming and exhaust valve technology, which is applied in the casting field of TiAl-based alloy castings, can solve the problems of centrifugal casting method, such as complex process, difficult internal quality assurance, complex casting process, etc., to avoid process and tedious process, and dimensional accuracy And the effect of high surface finish and good surface quality

Inactive Publication Date: 2014-12-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention solves the problems that the gravity casting of the existing titanium-aluminum-based alloy exhaust valve is difficult to make it smoothly filled, the internal quality is difficult to guarantee, the centrifugal casting method has complicated process, low material utilization rate, too complicated casting process, and poor surface quality. problem, and then provide a casting method for TiAl-based alloy exhaust valve

Method used

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  • Method for casting and forming TiAl-based alloy vent valve
  • Method for casting and forming TiAl-based alloy vent valve
  • Method for casting and forming TiAl-based alloy vent valve

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Experimental program
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specific Embodiment approach 1

[0017] Specific implementation mode one: combine figure 1 Explain that the casting method of a TiAl-based alloy exhaust valve in this embodiment is carried out according to the following steps:

[0018] Step 1, manufacture the exhaust valve metal mold 7, the middle part of the exhaust valve metal mold 7 is processed with a cavity 7-1, the interior of the exhaust valve metal mold 7 is processed with two exhaust passages 7-3, two exhaust The channels 7-3 are arranged side by side on both sides of the cavity 7-1, the upper end of the exhaust channel 7-3 communicates with the cavity 7-1, the lower end of the exhaust channel 7-3 is against the bottom of the mold 7, and the bottom of the mold 7 There is an annular sealing groove 7-4 on the upper surface, and the gate 7-2 of the exhaust valve metal mold 7 is located in the annular sealing groove 7-4;

[0019] Step 2: Install the first sealing ring 9 on the mold base 10, install the second sealing ring 6 in the annular sealing groove...

specific Embodiment approach 2

[0024] Specific embodiment two: the difference between this embodiment and specific embodiment one is that in step three, a graphite suction port with a diameter of 5 mm is selected. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0025] Specific embodiment three: the difference between this embodiment and specific embodiment one is that in step four, in step four, the TiAl-based alloy ingot melted in advance is put into the suction casting crucible 3 of the vacuum arc melting furnace, and then the melting chamber 2 is pumped Vacuum to 0.1Pa ~ 0.4Pa. Other steps and parameters are the same as in the first embodiment.

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Abstract

The invention provides a method for casting and forming a TiAl-based alloy vent valve, and relates to casting methods for the TiAl-based alloy vent valve. The technical problems that gravity casting of an existing TiAl-based alloy vent valve can not enable mold filling to be conducted smoothly, inner quality can not be guaranteed, a centrifugal casting method is complex in process, the material utilization rate is low, the casting process is too complex, and the surface quality is poor are solved. The method mainly comprises the steps that first, the prior art is used for manufacturing a metal mold of the vent valve; second, the metal valve of the vent valve in the first step is placed in a suction casting chamber of a smelting furnace, and the metal mold of the vent valve is mounted on a mold seat; third, a graphite suction port is mounted on a water cooling crucible; fourth, a TiAl-based alloy pig which is smelted in advance is placed in a suction casting crucible of a vacuum arc melting furnace, and overheating melt is obtained by smelting; fifth, a vacuum system of a suction casting chamber of the vacuum arc melting furnace is opened, a suction casting button is opened, suction casting, mold filling and cooling are conducted, and a casting is obtained. The method is used for preparing TiAl-based alloy vent valve castings.

Description

technical field [0001] The invention relates to a casting method of a TiAl-based alloy casting. Background technique [0002] TiAl-based alloys have such excellent properties: small specific gravity (3.9-4.1g / cm 3 ), high temperature resistance, high temperature oxidation resistance, high elastic modulus, etc., at the same time, it also has good creep resistance and certain room temperature plasticity and strength. These excellent performance characteristics make TiAl-based alloys have a wider range of applications and become one of the most promising materials in recent years. At present, the casting methods of titanium alloy mainly include gravity casting, centrifugal casting, investment casting and so on. Such as automobile exhaust valves, engine valves, watch casings, titanium handicrafts, etc., due to the poor fluidity of TiAl-based alloys in the liquid state, and the large shrinkage during the transition from liquid to solid, it is difficult to form TiAl-based alloys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D18/06
Inventor 王亮韩宝帅骆良顺孟宪宇董福宇苏彦庆郭景杰
Owner HARBIN INST OF TECH
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