How to prevent scratches on sheet metal

Poor raw materials.

1 Strict requirements for suppliers.

2 Intensify incoming inspection, especially the inspection of materials with strong concealment that have been pasted with protective film. (Ask suppliers to paste transparent protective film as far as possible)

CNC machine. Cutter, stamping die scratch and operator’s improper operation scratch.

1 For workpieces with high surface requirements, such as untreated surface, electroplating, aluminum, etc., if no protective film is attached to the incoming materials, a PE protective film with medium viscosity must be attached before processing, and it must be posted smoothly.

2 When loading, it is necessary to put a rubber pad between the two boards for protection. It is forbidden to drag the boards directly.

3 No matter the size of the material, it must be handled with care, without dragging or pulling.

4 EPE or cardboard shall be used for layered isolation when placing, and it is forbidden for workpieces to touch each other.

5 NC blanking should pay attention to prevent the machine, upper and lower dies and unloading plate from scratching the plate.

6 In order to prevent the material from falling freely and being bruised, rubber pads should be placed behind the machine tool to protect it.

7 The clearance between the upper die and the lower die and the discharging system must be adjusted during the punching process, so that the surface of the workpiece is free of scratches and die indentation. During the processing, the lower die should be cleaned timely and regularly to prevent iron filings from scratching the surface of the workpiece.

8 All film pasting materials shall be randomly inspected in the process to prevent the incoming materials from being scrapped in batches.

9 Laser can use the plate without protective film when blanking, but it is forbidden to move the plate by dragging when loading, and it should be lifted by many people (at least two people), and the appearance is not up to requirements. After blanking, the scraps, dust and EPE on the surface of the workpiece should be cleaned and placed in layers.

Indentation of bending tool and improper operation of operator

1 Before bending, remove objects that may scratch or hinder processing in the work area.

2 When working, it is not allowed to take or place the workpiece to be folded or folded by dragging, pulling or throwing, and it is really necessary to take it lightly without dragging or pulling.

3 When there are cracks in aluminum plate bending, the method of increasing the R angle of upper die can be adopted to reduce the occurrence of cracks.

4  The bending die should not use the knife-connecting method as far as possible. If it needs to be connected, it should be adjusted to the best smooth state.


5 When bending, PE bag should be used to cushion the film to prevent creases (it can’t be felt by hand or judged by sample comparison).

6 It is forbidden to collide and touch each other when placing, and protective devices must be used for storage and turnover to prevent scratching, bumping or falling.

Scratches in welding process.

1 Before welding, the protective film on both sides around the welding area must be removed to prevent surface defects caused by scorching of the protective film.

2 Direct contact between the surface of the workpiece and the workbench is strictly prohibited (the grounding position can be handled separately), and it can be separated and placed with smooth wood blocks, wood squares, EPE, etc., to prevent the iron filings and welding slag on the workbench from scratching the workpiece.

3 Handle with care, do not drag or pull, and do not put the workpiece on the workbench, pallet or ground at will.

4 Welds can be polished as far as possible, and if necessary, the polished area should be reduced as much as possible.

5 Try to avoid grinding the parts that are not welded. The welding slag splashed on these surfaces can be scraped off gently with a knife. If necessary, the splash area should be protected and isolated.

6 It is forbidden to collide and contact with each other when placing materials, and protective devices must be used for storage and turnover.

Scratches in the process of fitter’s machining

1 Keep the drill sharp when drilling and tapping.

2 Keep the table clean when drilling and tapping.

3 Placement shall be separated by layers, and it is forbidden for workpieces to contact each other.

4 For aluminum profile workpieces, special transfer devices or rubber frames should be used as far as possible to isolate them with EPE.

Injury in the process of material transportation

1 When delivery personnel use hand-propelled forklifts and elevators for transshipment, they must be bound with PE plastic wrap before transshipment.

2 During transshipment, the pallet should be kept in balance as far as possible, and the pallet should not be tilted too much to prevent the materials from being scratched and damaged.

Scratches in the process of surface processing

1 Check the workpiece carefully before feeding, remove the defects, and repair the scratched materials in time.

2 Wear gloves and sleeves when operating to prevent sweat stains and oil stains from contaminating the surface.

3 Pretreatment During the processing, the workpieces should be prevented from contacting with each other, and the workpieces should be isolated with PVC glue sticks or processed by hanging.

4 When blanking, you must pay attention to the decoupling method to avoid scratching the workpiece.

5 The finished products shall be protected, packaged and placed according to regulations, and shall not be stored in the processing workshop for more than four hours to prevent the air in the workshop from corroding the workpiece.

Scratches during product assembly

1 Keep the countertop clean when working.

2 Wear cotton gloves and disposable gloves and sleeves at work to prevent sweat stains, oil corrosion and dirty surfaces.

3 Take it gently, put it gently, don’t drag it.

4 Defective products must be protected by good product protection to prevent secondary defects.

Scratches during product storage and transportation.

1 According to customer demand and distance to develop a reasonable packaging method.

2 Maintain suitable conditions for warehouse storage (mainly temperature and humidity).

3 Strictly control the stacking height and rationally use the stacking method.

4 The goods of transportation vehicles should be placed reasonably and tied tightly.

5 Drivers should drive smoothly during driving and try to avoid sudden braking.

6 Handle goods with care when loading and unloading.

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