Friction welding material adding equipment and method

Abstract

The invention relates to friction welding material adding equipment. The friction welding material adding equipment comprises a machine base, a rotating device, a shaft shoulder, an extrusion rod, a shaft sleeve and an extrusion device. The invention further provides a method for carrying out material adding manufacturing by adopting the friction welding material adding equipment. According to the friction welding material adding equipment, high-quality material adding manufacturing of metal materials such as aluminum alloy can be achieved, and the material utilization rate and the production efficiency are improved.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to a friction welding additive equipment and method. Background technique [0002] Additive manufacturing technology is a brand-new manufacturing method that is different from traditional casting, forging, welding and other hot processing "equal material forming" technologies and cold processing "subtractive material forming" technologies such as turning, milling, and grinding. The method of manufacturing solid parts is a bottom-up manufacturing method compared to the traditional material removal-machining technology. [0003] At present, the commonly used metal additive manufacturing methods include laser, electron beam and electric arc additive manufacturing, which have the advantages of rapid prototyping and high processing precision, and are widely used in the fields of superalloy forming and precision component manufacturing. However, in the high-energy beam add...

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Problems solved by technology

However, in the high-energy beam additive manufacturing process, the high temperature will cause the material to melt. Due to the fast forming speed, there will inevitably be defects such as pores, cracks, and poor fusion when the material is solidified, and the subsequent processing and manufacturing will be harmful to the solidified material. Thermal action may reduce the overall performance, which has a more serious impact on the widely used low-melting point light metal materials such as aluminum and magnesium alloys. As a solid-phase additive manufacturing method, friction additive manufacturing has a grain It is a kind of additive method with development potential, and has unique advantages in light alloy additive.

[0004] Invention patent CN202110134068.9 discloses a friction stir additive device and additive manufacturing method. In this method, the wire is fed into the hollow cavity of the stirring head, and the piston is used to squeeze the wire into a rod and then rotate with the stirring head. , friction with the substrate to be added to achieve material addition, but this method has two shortcomings. One is that the wire is very tightly attached to the stirring head after being squeezed in the hollow cavity of the stirring head, and it is difficult to squeeze the additive material when it is working. The other one is that when the stirring head rotates with the rod, it rotates relative to the piston, which causes the friction between the piston and the rod to generate heat. After the rod softens, the piston will be inserted into the rod, which will lead to more material It is difficult to extrude, and the piston and the rod will be welded together after the rotation is stopped, which will affect the operation of the equipment

[0005] Invention patent CN201810234931.6 discloses a flow friction additive manufacturing device and additive manufacturing method. The method is thermally plasticized by the friction generated by the relative rotation between the rod and the shaft shoulder inner cavity, and the thermally plasticized material is Under the action of upsetting force, it flows out along the central through hole at the lower end of the shaft shoulder, and the outflowing thermoplastic material diffuses and deposits on the substrate to be added under the action of relative rotation between the outer end surface of the shaft shoulder and the surface of the substrate to be added. On the surface of the additive area, the disadvantage of this method is that in order to achieve the relative rotational friction between the rod and the inner cavity of the shoulder, the cross-sectional size of the rod will always be larger than the central through hole at the lower end of the shoulder, so the additive material cannot be fully extruded , the softened material accumulates in the cavity, which affects the extrusion and production efficiency of the material

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