Basic accuracy dimension requirements for automotive car stamping part
- Flatness: The plane part should be flat, and its flatness tolerance must meet the design requirements. For example, the flatness requirements of the body outer covering parts are high, otherwise it will affect the appearance flatness after assembly.
- Versatility: For some stamping parts with vertical installation requirements, such as door pillars, frame longitudinal beams, etc., the verticality tolerance should be within the specified range to ensure accuracy and stability after installation.
- Contour: The outer contour size and shape of the stamping parts should be consistent with the design drawings, and the contour tolerance must meet the assembly and use requirements. For example, the contour tolerance of the folding surface of the four doors and two covers should meet the corresponding standards.
Material and coating requirements
Materials for Automotive stamping part requirements
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Automotive bodycovering parts: such as doors, hoods, trunk lids, roofs, etc., ithave large sizes and complex shapes, and high requirements for surface quality and dimensional accuracy.
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Frame and chassis parts:including beams, subframes, suspension arms, torsion beams, etc. These parts need to withstand large loads, so the strength and stiffness of the materials are required to be high.
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Engine parts:such as cylinder blocks, cylinder heads, pistons, connecting rods, etc., have harsh working environments and need to withstand high temperatures, high pressures and high-speed impacts, and have high requirements for the heat resistance, wear resistance and corrosion resistance of the materials.
- Interior parts and accessories: such as seat frames, instrument panel brackets, armrests, buckles, etc., these stamping parts usually have certain requirements for appearance quality and comfort, and need to have good surface treatment and assembly performance.
Features
- High dimensional accuracy: Through die stamping processing, the dimensions of the stamping parts in the same batch can be guaranteed to be uniform and consistent, with good interchangeability, and general assembly and use requirements can be met without further machining.Good surface quality: The surface of the material is not damaged during the stamping process, and the appearance is smooth and beautiful, which provides convenient conditions for surface painting, electroplating, phosphating and other surface treatments.
Dimension Control Requirements:
Dimension and shape accuracy: The dimensional deviation of automobile hardware stampings should be controlled within a strict tolerance range, and the shape should meet the design requirements to ensure accurate assembly with other parts and the quality stability of the whole vehicle.
- Surface quality: The surface should be smooth and flat, without burrs, scratches, cracks and other defects to ensure the surface treatment effect and appearance quality, while avoiding wear or damage to other parts.
- Material properties: According to different use parts and functional requirements, the material should have corresponding mechanical properties, such as strength, hardness, toughness, fatigue limit, etc., as well as good processing performance and weldability.
- Reliability and durability: Automobile hardware stampings must withstand various complex working conditions and environmental conditions throughout the service life of the vehicle, so they need to have high reliability and durability and be able to work stably for a long time.
- Environmental protection and recyclability: With the improvement of environmental awareness, the materials of automobile hardware stampings should be recyclable as much as possible, and the pollution to the environment should be reduced during the production process.
- High production efficiency: Stamping production lines usually use automated and semi-automated equipment, such as multi-station progressive dies, etc., which can complete multiple stamping processes on one press, with fast production speed and can be mass-produced in a short time.
- Light weight and high strength: Under the premise of low material consumption, the parts manufactured by stamping are light in weight and have good rigidity, and after the sheet material is plastically deformed, the internal structure of the metal is improved, so that the strength of the metal stamping parts is improved.
Appearance requirements
- No obvious defects: The surface should be free of obvious defects such as scratches, abrasions, pits, convex hulls, cracks, wrinkles, ripples, etc. These defects will seriously affect the appearance of the car.
- Clear edges: For stamping parts with decorative edges or edges, such as doors, hoods, etc., the edges are required to be clear, smooth, symmetrical and evenly transitioned, and the edges should be matched, and unevenness is not allowed.
- Surface roughness: It needs to be controlled within a certain range. Generally, it is kept at a minimum through measures such as sheet quality, stamping production process and material management to ensure the smoothness and glossiness of the surface2.
Cleanliness surface requirements
- No oil stains: There should be no oil stains, grease and other stains on the surface of the stamping parts, otherwise it will affect the adhesion of subsequent surface treatment processes, such as painting and electroplating.
- No impurities: There should be no dust, iron filings, welding slag and other impurities on the surface. These impurities may fall off during use, causing component wear or affecting the normal operation of other systems.
- No rust: There should be no rust on the surface of the stamping parts, especially for some parts that are exposed to the external environment for a long time, such as chassis parts, body outer covering parts, etc. Rust will reduce the strength and service life of the parts.
