Sheet metal processing is the process of cutting, bending, and welding aluminum sheet products, and making them into different types of products. Traces will be left in cutting and welding. How to create a perfect surface of sheet metal processing parts requires surface Polished and polished.

Grinding and polishing methods are:

1. Grinding before welding

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

Operation method: When grinding long welds, use an angle grinder with a stainless steel bowl brush or a straight shank grinder to grind along the direction of the weld; for welds that require laser tracking automatic welding, only straight shank grinders can be used for grinding; When welding accessories on the surface of workpieces that are larger than the welding accessories, use the blade to grind the welding surface or grind and polish the products that need to be deburred before welding.

Technical requirements: Grind the metal luster, ensure that there is no oxide film in the welding area, the grinding pattern is parallel and uniform to the welding seam direction, and the grinding depth does not exceed 0.2mm.

2. Grinding of the weld height

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

Operation method: When the angle grinder is working, it should be parallel to the surface to be ground, so that the excess height of the weld is removed;

It is strictly forbidden to use the inclined shovel at the end of the blade to be ground.

Technical requirements: The surface to be polished should be smooth; the base metal should not be damaged, and the amount of the base metal to be removed should not exceed 0.2mm; the surface of the polished part should be

The surface texture requirements are consistent, and irregular grinding is strictly prohibited along the direction of the weld.

3. Remove surface scratches

Sanding range: Take a rectangular frame and cover the scratched area.

Operation method: Use a sanding tool to sand in a certain direction, not exceeding the rectangular frame.

Technical requirements: The surface to be polished should be smooth; the base metal should not be damaged, and the amount of the base metal to be removed should not exceed 0.2mm; the surface of the polished part should be

The surface texture requirements are consistent, the large parts and the oven body are drawn in the horizontal direction, and the small parts are in the same direction; irregular grinding is strictly prohibited.

4. Grinding of machining allowance

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

Operation method: Grind along the direction of the vertical rib to be processed, and use the angle grinder in the space that the angle grinder can use; use the straight grinder in the space that the angle grinder cannot use; the method and the welding seam height grinding same.

Technical requirements: the surface to be polished should be smooth; the base metal should not be damaged, and the amount of removal of the base metal should not exceed 0.2mm as the standard; the surface texture of the polished part should be consistent.

5. Use the abrasive cloth wheel for polishing

Grinding range: Polish the edges and corners of small spaces such as wire holes or polish some parts that have polishing requirements.

Operation method: Use a straight grinder with an abrasive cloth wheel to grind and polish the edges and corners.

Technical requirements: The polished surface needs to be smooth, and the visual inspection meets the drawing requirements, and the touch feels no sharp edges and corners; the base metal is not damaged, and the removal amount of the base metal does not exceed 0.2mm as the standard.

Preparing work before grinding and polishing:

1. Straight grinder. By installing the grinding wheel, the burrs of the sheet metal parts can be removed after installing the emery wheel; after installing the cone-head rotary file, it can grind a small range of deficiencies, excessive scratches, and weld joints.

Second, the angle grinder. It can be installed with polishing pads or flaps. The polishing pads can be used to polish sheet metal parts, and the flaps can be used to polish plate surface scratches or smooth welds. Polishing machine: Grind and polish the surface of sheet metal parts to make the surface smooth and shiny, without cracks and scratches.

3. Operators should wear goggles and protective clothing.

4. Clean the workbench and prepare all kinds of tools.

5. Prepare the sheet metal parts to be polished according to the amount of work and place them in the nearest location.

6. Check the qualification of the sheet metal parts to be ground and whether they have passed the quality inspection. Make sure the sheet metal parts are intact and free of cracks.

7. Check the conditions of each line to be used to ensure that there are no hidden dangers.

Eight, choose and install the appropriate grinding wheel.

9. Start the first piece of grinding, check whether it is qualified after completion, and start batch grinding after passing the quality inspection.

10. Check whether the grinding wheel is in good condition, the dust removal and ventilation equipment is in good condition, and wear protective clothing.

11. Place the metal plate to be polished. Small plates need to be fixed to prevent the position from changing during polishing and damage to the plate.

12. Check the degree of use of the polishing sheet and the grinding wheel sheet, and whether they need to be replaced.

13. During the grinding process, the strength of the tool should be appropriate.

14. If there are cracks and gaps on the surface of the sheet metal parts during grinding, it needs to be reworked and welded.

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For different polishing degrees and the polishing processes are divided into: coarse polishing(basic polishing process), fine polishing and light polishing .Choose the right polishing wheel to achieve the best polishing effect, while improving the polishing efficiency.