Polishing device, polishing method and polishing solution

Abstract

The invention discloses a polishing device, a polishing method and a polishing solution. The polishing device, the polishing method and the polishing solution are suitable for polishing metal workpieces with complicated surface structures. The polishing device comprises a polishing barrel, a first motor, a stirrer and a clamp, wherein the polishing barrel comprises a side wall and a base plate, the side wall and the base plate define a containing cavity, the containing cavity is used for containing SiO2 nano-particle liquid, the first motor is fixed to the polishing barrel, the stirrer is located at the bottom of the containing cavity and driven by the first motor to rotate, the stirrer stirs the SiO2 nano-particle liquid in the containing cavity, the clamp is fixed into the polishing barrel and used for fixing a metal workpiece. According to the polishing device, the polishing method and the polishing solution, high-speed liquid flow mixed with SiO2 nano-particles is utilized to makefriction with the surface of the metal workpiece, protrusions on the surface of the metal workpiece generate plastic deformation and even shear under high-speed collision of the SiO2 nano-particles, so that surface polishing of the metal workpiece is achieved; since the polishing medium is the fluid mixed with the SiO2 nano-particles, the damage to the integrity and the surface of the workpiece bychemical polishing and electrochemical polishing is avoided, and overall polishing of a special-shaped surface is achieved.

Description

technical field [0001] The invention relates to a polishing technology, which is especially suitable for surface polishing of metal parts with complicated surface structures such as 3D printing, and specifically relates to a polishing equipment, a polishing method and a polishing liquid. Background technique [0002] Laser selective melting technology is a kind of metal 3D printing forming technology. Laser selectively melts metal powder, melts and solidifies metal powder layer by layer, and can form metal structural parts or components with complex shapes in a short period of time, breaking through traditional metal machining. The technology can not make defects in metal parts and metal components with special-shaped structures, but the surface of the metal workpiece after 3D printing has a lot of floating powder, and the surface is still rough after sandblasting, which cannot meet the design and use requirements of designers and people. , need to spend a lot of manpower fo...

AI Technical Summary

Problems solved by technology

Among them, mechanical polishing uses the vibration and rotation of the grinding head or polishing media such as steel balls and sand. The surface of the metal workpiece is directly rubbed and polished with the polishing belt (wheel) and sand. Mechanical polishing not only forms a cold hardening layer on the surface of the metal workpiece , Sometimes it will damage the surface of metal parts, make the metal brittle, and there are restrictions on the shape of metal parts, it is difficult to fully polish some fine structures and internal structures, and it is not suitable for surface polishing of all metal parts

For example, some metal workpieces formed by 3D printing with complex curved surfaces, grid structure surfaces, and small inner holes cannot be polished using the current mechanical polishing technology

Chemical polishing is the use of corrosive polishing liquid media to dissolve rough particles on the surface of metal workpieces. Although liquid polishing media can be used to polish 3D printed special-shaped complex structural parts and improve the gloss of metal parts to a certain extent, chemical polishing The composition of the liquid is complex, the cost is high, and it will cause chemical hazards to the environment and actual operators; and due to the chemical corrosion and dissolution, the surface leveling ability of the metal parts after chemical polishing is not high

Electrochemical polishing, also known as electrolytic polishing, dissolves the concave and convex points on the surface of metal workpieces through electrochemical corrosion. It can also be used to polish complex and small metal workpieces. However, electrochemical polishing also has limitations and needs to be improved.

Electrochemical polishing has restrictions on the material of the polishing object: because the electrochemical polishing medium is fixed, the material is different, the polishing quality will vary greatly, and it is difficult to ensure the integrity of the workpiece; in addition, for some workpieces with rough surfaces, electrochemical polishing The polishing effect is not obvious, so it is not suitable for 3D printing parts with rough surfaces

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