Grinding and polishing methods

1. Grinding before welding

Grinding range: 15-50mm on both sides of all welds.

Operation method: when grinding long and wide welds, use angle grinder or straight shank grinder equipped with stainless steel bowl brush to grind along the weld direction; For the weld requiring laser tracking automatic welding, the straight shank grinder can only be used for grinding; When welding accessories on the surface of workpieces larger than the welding accessories, grind the welding surface with a thousand blade or polish the products requiring deburring treatment before welding forming.

Technical requirements: polish the metal luster, ensure that there is no oxide film in the welding area, the grinding grain is parallel and uniform with the weld direction, and the grinding depth shall not exceed 0.2mm.

2. Grinding of weld reinforcement

Grinding range: 25-50mm on both sides of the weld.

Operation method: when the angle grinder works, it shall be parallel to the polished surface to remove the weld reinforcement; When there is a depression in the weld, it is strictly prohibited to grind the surface with an oblique shovel at the end of the blade according to the standard of not damaging the base metal.

Technical requirements: the polished surface shall be smooth; No damage to the base metal, with the removal amount of the base metal not exceeding 0.2mm as the standard; The surface texture of the polished part shall be consistent. Irregular grinding is strictly prohibited along the weld direction.

3. Remove surface scratches

Grinding range: take the rectangular frame and cover the scratched area.

Operation method: use the grinding tool to grind in a certain direction, no more than the rectangular frame.

Technical requirements: the polished surface shall be smooth; No damage to the base metal, with the removal amount of the base metal not exceeding 0.2mm as the standard; The surface texture of the polished part shall be consistent, and the transverse drawing direction of large parts and oven body and the drawing direction of small parts shall be consistent; Irregular grinding is strictly prohibited.

4. Grinding of machining reinforcement

Grinding range: 40-50mm on both sides of machining reinforcement.

Operation method: grind along the direction of the processed vertical bar, and grind with an angle grinder in the space where the angle grinder can be used; The space where the angle grinder cannot be used shall be polished with a straight grinder; The method is the same as the grinding of weld reinforcement.

Technical requirements: the polished surface shall be smooth; No damage to the base metal, with the removal amount of the base metal not exceeding 0.2mm as the standard; The surface texture of the polished part shall be consistent.

5. Polish with abrasive cloth wheel

Grinding range: polish the edges and corners of small spaces such as wire holes or some parts (sheet metal brackets after laser cutting)with polishing requirements.

Operation method: use a straight grinder equipped with abrasive cloth wheel to polish the edges and corners.

Technical requirements: the polished surface shall be smooth, and the visual inspection shall meet the drawing marking requirements, and the touch feeling shall be free of sharp edges and corners; It will not damage the base metal, and the removal amount of the base metal shall not exceed 0.2mm.

6. Use a wire drawing machine for wire drawing

Scope of wire drawing: after welding, grind the surface or scratch the surface of the parts for wire drawing.

Operation method: use a wire drawing machine to draw the polished surface or scratched surface to make the wire direction of the workpiece surface consistent

And the luster lines are consistent.

Technical requirements: the wire drawing surface shall be smooth and consistent in luster and grain. The visual inspection shall meet the requirements of the drawing, and the touch shall feel rough and scrape the hand as the standard;

Without damaging the base metal, the overall grain, silk grain direction, uniform color and thickness are the standard.