Sheet metal processing steps and the eight common problems of sheet metal stampings
- Jan 02, 2019 -

Sheet metal is a comprehensive cold working process for metal sheets (usually below 6mm), including shearing, punching/cutting/compositing, folding, welding, riveting, splicing, forming (such as car body). Its remarkable feature is the same thickness of the same part. The products processed by the sheet metal process are called sheet metal parts. Sheet metal parts referred to by different industries are generally different, and are often used for the name of the assembly.


Sheet metal parts are characterized by light weight, high strength, electrical conductivity (can be used for electromagnetic shielding), low cost, and good mass production performance. They are widely used in electronics, communications, automotive, medical equipment, etc., for example. In computer cases, mobile phones, and MP3s, sheet metal parts are an integral part.


With the increasing use of sheet metal, the design of sheet metal parts has become an important part of the product development process. Mechanical engineers must be proficient in the design skills of sheet metal parts, so that the design of sheet metal meets the product. The functions and appearance requirements make the stamping die simple to manufacture and low in cost.


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Sheet metal processing steps


Usually, the three most important steps in a sheet metal factory are cutting, punching, cutting, and folding.


Sheet metal is sometimes used for sheet metal. The word comes from English sheet metal. Generally, some metal sheets are plastically deformed by hand or die stamping to form the desired shape and size, and can be further welded or a small amount of machinery. Processing to form more complex parts, such as the chimneys commonly used in the home, the iron stove, and the car shell are all sheet metal parts.


Sheet metal processing is called sheet metal processing. Specifically, the use of sheet metal to make chimneys, iron drums, oil tanks, ventilation pipes, elbows, rounds, rounds, funnels, etc. The main processes are shearing, bending, bending, bending, welding, riveting, etc. Certain geometric knowledge.


Sheet metal parts are thin-plate hardware, that is, parts that can be processed by means of stamping, bending, stretching, etc. A general definition is -


Parts with constant thickness during processing. Corresponding to castings, forgings, machined parts, etc., for example, the outer iron shell of the car is a sheet metal part, and some kitchen utensils made of stainless steel are also sheet metal parts.


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Common problems and causes of sheet metal processing stamping parts processing


1. Glitch: During the process of punching or trimming, there is no residual material left. The burr is generated under the section of the steel plate. Based on the cross-section, when the burr height is 0.2mm or more, the iron powder will damage the mold and produce bumps. 


2. Concave and concave: The surface of the material is abnormally convex or concave, which is caused by the incorporation of foreign matter (iron filings, dust) on the unwinding line.


3. Roller printing: The cleaning roller or the feeding roller is caused by the attachment of foreign matter (occurring at a fixed pitch). Under normal circumstances, the foreign matter on the sheet can be removed.


4. Sliding print: occurs when the roller slides, when it stops suddenly or accelerates.


5. The pulverization of the coil may be creping at the edge: the guide roller of the unwinding line may be caused by the creping of the guide roller on the mold, which is caused by the unwinding of the coil feed.


6. Scratches: The main cause of scratches on the parts. There are sharp scratches on the mold or metal dust falling into the mold. Preventing measures is to repair the scratches on the mold and remove metal dust.


7. Bottom cracking: The main cause of cracking at the bottom of the part is that the material is poorly plasticized or the die presser ring is pressed too tightly. The prevention measures are to replace the plastic material or to loosen the presser ring.


8. Wrinkles on the side wall: The main reason for wrinkles on the side wall of the part is that the thickness of the material is insufficient (slightly small thickness is allowed to be thin) or eccentricity occurs when the upper and lower molds are installed, resulting in a large gap on one side and a small gap on the other side. Preventive measures are to replace materials and re-adjust the mold.