AV 04 Precision Dimensin Automotive Vehical Metal Stamping Shine Surface from Dr Solenoid

Best Material for automotive stamping part.

·Ordinary carbon steel: It has good plasticity and weldability, low cost, and is often used for some automotive hardware stamping parts that do not require high strength, such as body interior parts, brackets, etc.

·High-strength steel: high strength and good toughness, can reduce the weight of the car while improving the safety and reliability of the car body, widely used in frames, body structural parts, etc.

·Stainless steel: has good corrosion resistance and oxidation resistance, often used in automobile exhaust systems, engine parts and some parts that need to be exposed to harsh environments for a long time.

·Aluminum alloy: low density, high strength, good thermal conductivity, good processing performance and recyclability, and is increasingly used in automobile manufacturing, such as body panels, engine cylinders, wheels, etc.

How to choose the material of automobile stamping parts?

Select according to the performance requirements

·Strength and stiffness requirements: For load-bearing parts such as frames and beams, high-strength and high-rigidity materials such as high-strength steel plates and ultra-high-strength steel plates are required, with a yield strength of more than 500MPa, which can withstand large loads3.

·Corrosion resistance requirements: The exhaust system, chassis and other parts of the car are often exposed to corrosive media such as water, mud, and salt. Materials with good corrosion resistance should be selected, such as stainless steel, galvanized steel plates, etc.

·Heat resistance requirements: Stamping parts around the engine, such as cylinder blocks and pistons, have high working environment temperatures, and need to use materials with good heat resistance, such as heat-resistant steel, high-temperature alloys, etc., which can maintain good mechanical properties at high temperatures.

·Fatigue resistance requirements: Stamping parts such as suspension systems need to withstand repeated alternating loads, and materials with good fatigue resistance should be selected, such as high-strength steel with high fatigue limits, spring steel, etc.

Selection based on process performance

·Stamping performance: For automobile body covering parts with complex shapes, such as doors and hoods, materials with good stamping performance, such as low-carbon cold-rolled steel plates, ultra-low-carbon cold-rolled steel plates, etc., should be selected, with good ductility and plasticity3.

·Welding performance: For stamping parts that need to be welded and assembled, the welding performance of the material is crucial. For example, high-strength steel plates with good weldability are often selected for automobile compartment parts3.

· Machining performance: Some stamping parts need to be machined after stamping. Materials with good machinability, such as free-cutting steel, should be selected to facilitate turning, grinding and other processing.

Consider economic efficiency

· Material cost: Under the premise of meeting the performance and process performance, materials with lower costs, such as ordinary carbon steel, low-alloy high-strength steel, etc., should be given priority to reduce the manufacturing cost of automotive parts145.

· Processing cost: The processing difficulty and processing cost of materials should also be considered. For example, some high-strength steels and alloy steels have high material costs but good processing performance. The processing cost can be reduced by optimizing the processing technology.

· Service life and maintenance cost: Selecting materials with reliable quality and long service life can reduce the maintenance and replacement costs of automobiles during use. For example, using materials with good corrosion resistance can reduce maintenance and replacement caused by corrosion.

Combined with the development trend of automobiles

·Lightweight demand: With the development of automobile lightweight, more and more high-strength aluminum alloys, magnesium alloys and other lightweight materials are used in automobile stamping parts, such as body panels, engine blocks, etc., while reducing the weight of the body, improving fuel economy and vehicle handling performance3.

·New energy vehicle demand: New energy vehicles have special requirements for the electromagnetic compatibility and safety of stamping materials. For example, the battery pack shell needs to use materials with good electromagnetic shielding performance, and at the same time meet safety requirements such as fire prevention and explosion prevention.

The surface quality requirements of automobile stamping parts are mainly in the following aspects:·

The following common problems of automotive hardware stampings:

Surface quality problems

· Burrs: Incompletely leaving excess material during punching or trimming, burrs are generated on the lower part of the steel plate cross section. When the burr height is too high, the iron powder will damage the mold and produce convex and concave.

· Concave and convex: The surface of the material is abnormally raised or concave, usually caused by foreign matter such as iron filings and dust mixed in the unwinding line.

· Scratches: There are sharp scratches on the mold or metal dust falls into the mold, causing scratches on the parts.

· Roller marks: Foreign matter attached to the cleaning roller or the feeding roller will leave roller marks on the sheet, and generally occur at a fixed pitch.

· Sliding marks: Due to the sliding of the roller, sliding marks will appear on the surface of the sheet when it stops or accelerates suddenly.

Shape and size problems

· Wrinkling: Wrinkling due to accumulation of materials, too much material entering the cavity of the die; or wrinkling due to weak constraint force in the thickness direction of the sheet material, which leads to instability of the compression flange, etc., which often occurs in processes such as drawing and flanging1.

· Cracking: If the material has insufficient tensile strength, insufficient deformation, time-aging cracks, and the material is bent and then bent back after being stretched, the strain exceeds the material limit during the stamping process, resulting in instability and cracking1.

· Springback: After the parts are stamped, the forming force is unloaded, causing partial or overall deformation of the material, affecting the dimensional accuracy and shape accuracy of the parts1.

· Dimensional deviation: The loose positioner causes the punch to be unable to be fixed, or the mold is worn, resulting in inconsistent dimensions of the metal stamping parts.

Mold-related problems

· Punch wears too fast: The mold gap is too small, or the punch temperature is too high due to too long operation time during production, which will cause the punch to wear too fast.

·Mold carryover: Edge blunting can easily cause waste rebound, and unreasonable clearance can also cause waste rebound, resulting in mold carryover.

Material and process problems

·Material defects: Impurities in the material may cause stripe cracks, generally parallel to the sheet rolling direction1.

·Process parameters are not implemented properly: For example, in the flanging process, the processing technicians did not adjust the machine pressure in time according to the process requirements, or did not communicate the pressure stability information during the shift handover, resulting in unstable part quality.

Product Details Diagram