Method for preparing copper alloy additive material based on electron beam powder laying forming

Abstract

The invention discloses a method for preparing a copper alloy additive material based on electron beam powder laying forming. The method comprises steps that an obtained STL format file is inputted into rapid forming software of a molding machine; a layer of copper alloy powder is spread on a forming platform in advance, and an electron beam preheats a substrate and a powder bed; the outline is melt, and the electron beam scans the boundary in a spotted mode; the cross section is melt, and an electron beam linear scanning cross-section beam current value is increased from 5.5 mA to 7 mA over time; the process is repeated till manufacturing of copper alloy parts is completed. The method is advantaged in that the method is the additive material manufacturing technology utilizing powder laying electron beam selective zone melting, due to substrate and powder bed preheating and beam incremental scanning modes of the electron beam before melting, warping and non-dense organization caused bythe residual stress in the forming process are effectively reduced, the phenomenon of overheating or spheroidization of formed parts is avoided, and thereby high quality and efficient additive material manufacturing of the copper alloy is achieved.

Description

technical field

[0001] The invention relates to an additive manufacturing method, in particular to a method for preparing copper alloy additive based on electron beam powder laying and forming. Background technique

[0002] At present, copper or copper alloy products or parts are mainly manufactured by casting or machining. The cost of the mold used in the casting method is high, and the process engineering is difficult to control, which is prone to structural defects and affects its life; while the mechanical processing method has high processing precision, but there are problems such as low material utilization rate, numerous and complicated processes, long production cycle, and high manufacturing cost. Therefore, for complex components, the current two manufacturing processes cannot meet the progress requirements of rapid development and mass production of new products.

[0003] Metal additive manufacturing technology is driven by CAD software, using a heat source to mel...

Examples

Embodiment 1）

[0032] What the present embodiment prepares is Cu-10Al-4Fe copper alloy cube, and the preparation method based on electron beam powder spreading comprises the following steps:

[0033] ①Use CAD to establish a three-dimensional solid model of Cu-10Al-4Fe alloy cube, and then use layered software to divide the three-dimensional solid model into thin slices with a thickness of 0.75mm to obtain STL format files, and then import the obtained STL format files into electron beam rapid prototyping machine rapid prototyping software.

[0034] ② Turn on the power, reset all data to zero, and check whether there is enough Cu-10Al-4Fe alloy powder in the powder box. Adjust the forming platform and fill it with craft powder. The forming platform is 30-35mm away from the bottom of the scraper, which is about the thickness of the substrate.

[0035] ③Put the cleaned base plate in the center of the process powder on the forming platform, and fit it with the thermocouple; adjust the base pla...

Embodiment 2）

[0043] The rest of the preparation method based on electron beam powder spreading and forming of the present embodiment are the same as in Example 1, except that:

[0044]In step ①, use CAD to establish a three-dimensional solid model of Cu-10Al-4Fe alloy cube, and then use layered software to divide the three-dimensional solid model into slices with a thickness of 0.50 mm to obtain STL format files.

[0045] Step ⑦ When melting the cross section, the beam current value of the electron beam linearly scans the cross section from 5.5mA (330kW) to 7mA (420kW) incrementally over time, and the increment speed is 0.2mA / s.

Embodiment 3）

[0047] The rest of the preparation method based on electron beam powder spreading and forming of the present embodiment are the same as in Example 1, except that:

[0048] In step ①, use CAD to establish a three-dimensional solid model of Cu-10Al-4Fe alloy cube, and then use layered software to divide the three-dimensional solid model into slices with a thickness of 0.60mm to obtain STL format files.

[0049] Step ⑦ When melting the cross-section, the beam current value of the electron beam linearly scans the cross-section from 5.5mA (330kW) to 7mA (420kW) with time, and the increment speed is 0.3mA / s.

technical field

[0001] The invention relates to an additive manufacturing method, in particular to a method for preparing copper alloy additive based on electron beam powder laying and forming. Background technique

[0002] At present, copper or copper alloy products or parts are mainly manufactured by casting or machining. The cost of the mold used in the casting method is high, and the process engineering is difficult to control, which is prone to structural defects and affects its life; while the mechanical processing method has high processing precision, but there are problems such as low material utilization rate, numerous and complicated processes, long production cycle, and high manufacturing cost. Therefore, for complex components, the current two manufacturing processes cannot meet the progress requirements of rapid development and mass production of new products.

[0003] Metal additive manufacturing technology is driven by CAD software, using a heat source to mel...

Examples

Embodiment 1）

[0032] What the present embodiment prepares is Cu-10Al-4Fe copper alloy cube, and the preparation method based on electron beam powder spreading comprises the following steps:

[0033] ①Use CAD to establish a three-dimensional solid model of Cu-10Al-4Fe alloy cube, and then use layered software to divide the three-dimensional solid model into thin slices with a thickness of 0.75mm to obtain STL format files, and then import the obtained STL format files into electron beam rapid prototyping machine rapid prototyping software.

[0034] ② Turn on the power, reset all data to zero, and check whether there is enough Cu-10Al-4Fe alloy powder in the powder box. Adjust the forming platform and fill it with craft powder. The forming platform is 30-35mm away from the bottom of the scraper, which is about the thickness of the substrate.

[0035] ③Put the cleaned base plate in the center of the process powder on the forming platform, and fit it with the thermocouple; adjust the base pla...

Embodiment 2）

[0043] The rest of the preparation method based on electron beam powder spreading and forming of the present embodiment are the same as in Example 1, except that:

[0044]In step ①, use CAD to establish a three-dimensional solid model of Cu-10Al-4Fe alloy cube, and then use layered software to divide the three-dimensional solid model into slices with a thickness of 0.50 mm to obtain STL format files.

[0045] Step ⑦ When melting the cross section, the beam current value of the electron beam linearly scans the cross section from 5.5mA (330kW) to 7mA (420kW) incrementally over time, and the increment speed is 0.2mA / s.

Embodiment 3）

[0047] The rest of the preparation method based on electron beam powder spreading and forming of the present embodiment are the same as in Example 1, except that:

[0048] In step ①, use CAD to establish a three-dimensional solid model of Cu-10Al-4Fe alloy cube, and then use layered software to divide the three-dimensional solid model into slices with a thickness of 0.60mm to obtain STL format files.

[0049] Step ⑦ When melting the cross-section, the beam current value of the electron beam linearly scans the cross-section from 5.5mA (330kW) to 7mA (420kW) with time, and the increment speed is 0.3mA / s.

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