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Atmosphere control method for SLM device forming cavity

A control method and forming cavity technology, which is applied in the direction of additive manufacturing, process efficiency improvement, energy efficiency improvement, etc., can solve the problems of high air tightness of the cavity, consume a large amount of gas, damage of vacuum pump, etc., and achieve control stability Good, the atmosphere is easy to maintain, and the effect of cleaning the cavity is good

Active Publication Date: 2018-05-15
SHANGHAI AEROSPACE EQUIP MFG GENERAL FACTORY
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with the negative pressure replacement gas method is that it needs to be realized by continuously turning on / off the vacuum pump, which will cause certain damage to the vacuum pump and cause serious heat generation when the vacuum pump runs for a long time. If the heat dissipation is not good enough It is easy to burn out the motor, which will affect the service life of the vacuum pump; on the other hand, the vacuum pump adopts a negative pressure control method, which requires high air tightness of the cavity, and the oxygen content in the cavity is difficult to maintain for a long time. Maintain, control stability is difficult to be guaranteed
In addition, this negative pressure displacement gas method also has the problem of consuming a large amount of gas

Method used

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  • Atmosphere control method for SLM device forming cavity
  • Atmosphere control method for SLM device forming cavity
  • Atmosphere control method for SLM device forming cavity

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Experimental program
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Embodiment Construction

[0023] Below, combined with Figure 1~3 , an embodiment of the method for controlling the atmosphere of the forming cavity of the SLM equipment according to the present invention will be described in detail. This embodiment is only an example to illustrate a preferred embodiment of the present invention, but does not constitute a limitation to the present invention.

[0024] figure 1 It is a schematic flow chart of the cycle starting step 100 of the method for controlling the atmosphere of the forming cavity of the SLM equipment in this embodiment; figure 2 is a schematic flow chart of the start step 200 of the intake and exhaust cycle in this embodiment; image 3 is a schematic flowchart of the stop loop step 300 of this embodiment.

[0025] As shown in the drawings, the method for controlling the atmosphere of the forming cavity of the SLM equipment in this embodiment includes a cycle start step 100 , an intake and exhaust cycle start step 200 , and a cycle stop step 300...

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Abstract

The invention discloses an atmosphere control method for an SLM device forming cavity. The method includes the steps of circulation starting, wherein first vacuumizing and second vacuumizing are carried out; air feeding and discharging circulation starting, wherein when the oxygen content is larger than a set value, air discharging at t2 is carried out, and then air feeding at t3 is carried out; circulation stopping, wherein the circulation stopping step is the step carrying out stopping when circulation needs to be closed after any one of the circulation starting step and the air feeding anddischarging circulation starting step is carried out. According to the control method, the requirement for the air impermeability of a cavity body of the forming cavity is low, waste of a large amountof gas can be avoided, the control method has the good stability, and debugging and maintaining are more convenient.

Description

technical field [0001] The invention relates to the field of metal melting additive manufacturing, in particular to an atmosphere control method for a forming chamber of an SLM equipment. Background technique [0002] One of the necessary working conditions for SLM equipment (also known as metal melting additive manufacturing equipment) is that the oxygen content of the forming cavity is required to be lower than 0.1%, otherwise it will affect the printing quality. When printing titanium alloys, aluminum alloys, etc. Metals can even lead to failure to print successfully, and what's more, it can cause an explosion. Therefore, a difficult point and key technology in the development of SLM equipment is the design of the forming cavity and the control of the atmosphere circulation of the forming cavity. [0003] The control methods of SLM setting cavity atmosphere circulation mainly include direct replacement gas method and vacuum pumping + intake and exhaust cycle control meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B33Y40/00
CPCB33Y40/00B22F10/00B22F12/90B22F10/28B22F10/32Y02P10/25
Inventor 时云王联凤李鹏杨洋郭立杰
Owner SHANGHAI AEROSPACE EQUIP MFG GENERAL FACTORY
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