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Air control device and control method for large-scale vacuum pressurized casting equipment

A technology for casting equipment and air control, which is applied in the field of air control devices for large-scale vacuum pressurized casting equipment, can solve problems such as poor control accuracy, achieve the effects of reducing casting defects, enhancing solidification feeding ability, and improving pressure difference control accuracy

Active Publication Date: 2017-04-12
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiency of poor control accuracy of existing vacuum pouring devices, the present invention provides an air control device for large-scale vacuum pressurized casting equipment

Method used

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  • Air control device and control method for large-scale vacuum pressurized casting equipment

Examples

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Comparison scheme
Effect test

Embodiment 1

[0020] Example 1. The air control device of the large-scale vacuum pressurized casting equipment of the present invention includes a vacuum buffer tank 1, a vacuum pump 2, an air storage tank 3, an air compressor station 4, a PLC control module 5, a differential pressure transmitter 6, a first air control shut-off valve 7, The second pneumatic shut-off valve 8 , the third pneumatic shut-off valve 9 , the fourth pneumatic shut-off valve 10 and the fifth pneumatic shut-off valve 11 . One end of the fifth air-operated shut-off valve 11 is connected to the equipment main body 12 through a vacuum pipeline, and the other end of the fifth air-operated shut-off valve 11 is connected to the vacuum buffer tank 1 through a vacuum pipeline, and the vacuum buffer tank 1 is also connected to a vacuum pump 2 . After the first air-controlled shut-off valve 7, the second air-controlled shut-off valve 8, the third air-controlled shut-off valve 9 and the fourth air-controlled shut-off valve 10 a...

Embodiment 2

[0021]Example 2. A large-scale component is formed by gypsum-type precision casting method. After the degassing and refining treatment of molten metal is completed, the molten metal is put into the rotating ladle of the equipment main body 12, and then the baked large-scale plaster mold is sent into the equipment main body 12. Inside, and seal and lock the main body 12 of the device. Start the PLC control module 5, input process parameters: pouring vacuum degree 0.002MPa, pouring time 30 seconds, vacuum breaking time 5 seconds, holding time under normal pressure 3 seconds, pressurized solidification speed 0.02MPa / s, pressurized pressure 0.5MPa, The holding time is 900 seconds. The PLC control module 5 outputs control signals to open and close different air-operated stop valves according to the set process parameters, so as to realize real-time control of the pressure difference in the main body 12 of the equipment. When pouring starts, open the fifth air-controlled stop valv...

Embodiment 3

[0022] Example 3. A large-scale component is formed by gypsum-type precision casting method. After the degassing and refining treatment of molten metal is completed, the molten metal is put into the rotating ladle of the equipment main body 12, and then the baked large-scale plaster mold is sent into the equipment main body 12. Inside, and seal and lock the main body 12 of the device. Start the PLC control module 5, input process parameters: pouring vacuum degree 0.002MPa, pouring time 35 seconds, vacuum breaking time 8 seconds, holding time under normal pressure 4 seconds, pressurized solidification speed 0.025MPa / s, pressurized pressure 0.5MPa, The holding time is 3000 seconds. The PLC control module 5 outputs control signals to open and close different air-operated stop valves according to the set process parameters, so as to realize real-time control of the pressure difference in the main body 12 of the equipment. When pouring starts, open the fifth air-controlled stop v...

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Abstract

The invention discloses a pneumatic control device and control method of large vacuum pressurization casting equipment in order to solve the technical problem of low control accuracy of an existing vacuum casting device. According to the technical scheme, the pneumatic control device comprises a vacuum buffering tank, a vacuum pump, an air storage tank, an air compression station, a programmable logic controller (PLC) control module, a pressure difference transmitter and pneumatic control stop valves from the first to fifth one. One end of the fifth pneumatic control stop valve is connected with an equipment body, and the other end of the fifth pneumatic control stop valve is connected with the vacuum buffering tank. The first pneumatic control stop valve, the second pneumatic control stop valve, the third pneumatic control stop valve and the fourth pneumatic control stop valve are connected in parallel, then one end is connected with the equipment body, and the other end is connected with the air storage tank. One end of the pressure difference transmitter is connected with the equipment body through a pressure difference signal collecting pipeline, and the other end of the pressure difference transmitter is electrically connected with the PLC control module. The PLC control module completes control over the different pneumatic control stop valves according to set process parameters, and accurate control over the pressure difference in the vacuum pressurization casting equipment is achieved.

Description

technical field [0001] The invention relates to an air control device for large-scale vacuum pressurized casting equipment, and also relates to a method for using the air control device to control large-scale vacuum pressurized casting equipment. Background technique [0002] Vacuum pressurized casting is a casting method that pours molten metal into molds under vacuum conditions and solidifies the molten metal in a positive pressure environment. This method has the advantages of good filling effect, compact solidification structure, and good mechanical properties of castings. features. In recent years, it has become more and more common to produce large and complex thin-walled components in the aerospace field by vacuum pressurized casting. Due to the long pouring and solidification time of vacuum pressurized casting of large components, the control of process parameters in this process has an important impact on the final structure and performance of castings. If the pres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D18/06
Inventor 李新雷介万奇杨光昱
Owner NORTHWESTERN POLYTECHNICAL UNIV
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