Auto Car Part Sheet Metal Stamping Parts

Jiaxing Dazhe Fastener is a China-based manufacturer of Auto Car Part Sheet Metal Stamping Parts, with many years of experience in stamping parts production. We have served customers in overseas markets and have developed practical experience in producing stamping components for automotive applications. We focus on consistent product quality, reliable production, and competitive pricing to meet different customer requirements.

Common Raw Materials for Automotive Sheet Metal Stamped Parts

Automotive sheet metal stamped parts are mainly made of steel, aluminum alloy and stainless steel, with the following materials widely used in auto parts factories:

1. Cold rolled steel DC01/DC03/DC04: Soft and easy to form, cost-effective. Mostly used for interior small parts and various fixing brackets.

2. Hot rolled steel SPHC: Thicker and harder, applied to load-bearing components and thick stamped chassis parts.

3. High-strength steel HC340LA, HC420LA: High-strength low-alloy material specially for anti-collision frames and body load-bearing structures, anti-deformation and impact-resistant.

4. Aluminum alloy 5052/6061: Lightweight with good rust resistance, ideal for new energy vehicle housings, battery casings and decorative parts.

5. Stainless steel 304/430: Excellent anti-corrosion performance, the top choice for exhaust surrounding parts, interior trims and frequently water-contacted components.

6. Galvanized steel DX51D: Pre-galvanized surface for basic anti-rust performance without extra coating, commonly used for small ordinary chassis brackets.

Differences in Stamping Process for Various Raw Materials

Automotive sheet metal stamped parts vary greatly in processing flow due to different material hardness and ductility:

1. Ordinary cold rolled steel: Uncoiling & leveling → blanking → bending / deep drawing → trimming → shaping. Simple forming, low mold loss and fast production speed.

2. High-strength steel: Pressure buffering before stamping, high tonnage stamping equipment required, wear-resistant coating on molds, plus stress relief after forming. Prone to cracking and unsuitable for deep drawing.

3. Aluminum alloy: Soft and scratch-prone, protected by film before stamping with reduced stamping speed. Deburring & polishing required after forming; high temperature and heavy pressure are forbidden to avoid wrinkling.

4. Stainless steel: High hardness with severe springback after stamping, an extra leveling process is needed. Molds and cutters wear quickly, and special lubricant is required for drawing work.

5. Thick hot rolled steel: Laser/plasma cutting for blanking before stamping. High bending force is needed for thick plates, heavy burrs on edges which demand extended polishing procedures.

6. Galvanized steel: Special stamping oil is used throughout production to avoid damaging the zinc coating. Heavy polishing after forming is prohibited to protect anti-rust layer.

Main Surface Treatments for Automotive Sheet Metal Stamped Parts

Surface treatments for automotive sheet metal stamped parts fall into three categories: anti-corrosion, wear-resistant and decorative. The mainstream processes used in auto parts plants are as follows:

1. Electro-galvanizing: Thin zinc layer with low cost, only for basic rust prevention, suitable for dry small interior parts.

2. Hot-dip galvanizing: Thick zinc layer with superior anti-corrosion performance, applied to chassis and structural parts exposed to rain and water all year round.

3. Zinc-nickel alloy plating: Much better salt spray resistance than ordinary galvanizing, standard for new energy vehicle chassis and battery brackets.

4. Cathodic Electrodeposition (ED coating): Uniform full coverage film with strong adhesion, widely used for all inner body stamped parts.

5. Powder coating: Scratch and wear resistant, mostly matte black, popular for chassis brackets and metal fasteners.

6. Liquid painting: Attractive customizable colors, used for exterior decorative stamped parts such as door and hood panels.

7. Stainless steel brushing / mirror polishing: No extra coating, only for decorative interior metal covers.

8. Black oxide finish: Low-cost short-term rust prevention, for non-exposed small interior parts with limited corrosion resistance.

9. Passivation & sealing: Used together with galvanization to extend coating service life and improve anti-rust capacity.

Application Scenarios of Automotive Sheet Metal Stamped Parts

Requirements on strength, anti-rust property and appearance of automotive sheet metal stamped parts differ drastically according to installation positions:

1. Interior area: Various mounting brackets, clip bases and interior covers. Dry and closed environment with low load pressure.

2. Exterior body area: Door panels, decorative covers and small hood parts, strict requirements on surface flatness and appearance.

3. Chassis area: Suspension brackets, chassis guards and battery fixing supports. Constantly exposed to mud, water and sand with frequent collision and abrasion.

4. New energy battery pack area: Battery housings and battery fixing stampings, lightweight, insulated and resistant to moisture & acid-base corrosion required.

5. Engine surrounding area: Heat baffles and fixing brackets, working under long-term high temperature and oily environment.

6. Exhaust surrounding area: Heat shields and fixing clips, enduring both high temperature and water vapor corrosion.

7. Interior decoration area: Stainless steel trim strips and metal panels, focusing only on appearance without heavy load demand.

Matching Surface Treatments for Automotive Sheet Metal Stamped Parts by Application Scenarios

Working environment directly determines the suitable surface treatment for automotive sheet metal stamped parts. Matching solutions are listed below:

1. Dry interior small parts (no rain/water contact): Electro-galvanizing plus sealing or black oxide finish, most cost-effective option.

2. Exterior visible body parts: ED primer followed by topcoat painting, smooth appearance with basic rust protection.

3. Chassis parts exposed to water and stone impact: Hot-dip galvanizing, zinc-nickel plating or powder coating, good salt spray resistance and anti-scratch performance.

4. New energy battery stamped parts: Zinc-nickel plating matched with ED coating, balancing lightweight, anti-rust and insulation performance.

5. High-temperature engine surrounding parts: High-temperature resistant powder coating or high-temperature special galvanizing, coatings won't peel off under heat.

6. High-temperature exhaust heat shielding parts: Directly use brushed polished stainless steel without coating, high temperature resistant and rust-free.

7. Interior decorative metal parts: Brushed or mirror-polished stainless steel without coating for premium texture.

Market Prospect of Automotive Sheet Metal Stamped Parts

The overall market demand for automotive sheet metal stamped parts remains stable, boosted by new energy vehicles with promising development prospects:

1. Traditional fuel vehicles: Body, chassis and interior assemblies all rely on sheet metal stampings. Stable existing market with continuous orders for replacement spare parts.

2. New energy electric vehicles: Lightweight trend fuels surging demand for aluminum alloy stampings. Orders for battery pack and body structural parts keep rising, and high-strength steel premium stampings bring higher profit margins.

3. Export market: Overseas vehicle manufacturers and auto aftermarket place large orders for sheet metal stampings, with steady demand from Europe, America and Southeast Asia.

4. Industry competition: Low-end ordinary brackets yield thin profit margins. Factories focusing on high-strength steel, aluminum alloy and new energy-specific stampings gain higher premium.

5. Long-term trend: Automakers keep pursuing lightweight design and higher anti-corrosion standards. High anti-rust, high-strength and lightweight sheet metal stamped products will become increasingly popular, and manufacturers with mature process technology hold stronger competitiveness.

6. Industry risks: Fluctuations in steel and aluminum raw material prices squeeze profit margins. Overcapacity exists among low-end small workshops. Only enterprises supporting vehicle OEMs and new energy customers enjoy stable development.