Deep Drawn End Cap

XIAYI Deep Drawn End Cap is developed to solve these common sealing and forming challenges. By using high-quality cold-rolled steel, multi-stage deep drawing technology and precision edge processing, XIAYI achieves uniform wall thickness, stable pressure resistance and reliable sealing performance for automotive shock absorber applications.

Sealing Challenges in Shock Absorbers

The shock absorber operates under continuous pressure changes, vibration and temperature variation. As a sealing and pressure-bearing component, the end cap directly affects oil retention, internal pressure balance and damping stability.

Common problems of conventional end caps include uneven material distribution, residual forming stress, welding leakage, deformation under pressure and premature sealing failure. These issues may gradually reduce shock absorber performance and increase vehicle maintenance costs.

XIAYI focuses on improving forming consistency and sealing reliability through advanced manufacturing processes and strict quality control.

Deep Drawing Process Control

Uniform Wall Thickness Forming

XIAYI uses high-grade SPDC/SPH440 thick cold-rolled steel as the main material, with thickness tolerance controlled within ±0.05mm. Each batch of raw materials undergoes strict inspection to ensure stable mechanical properties.

The optimized material structure provides a reliable foundation for pressure resistance and prevents early failure caused by uneven thickness or material defects.

Multi-Stage Drawing Technology

Unlike ordinary one-step stamping, XIAYI applies four-stage progressive deep drawing technology to gradually shape the component. The process controls wall thickness difference within ≤0.03mm while reducing forming stress and surface defects.

The integrated forming structure improves internal stress distribution, reduces deformation risks and provides better sealing consistency during long-term operation.

Precision Edge Processing

The edge area directly affects welding connection and sealing performance. XIAYI applies professional flanging and finishing processes to maintain accurate edge geometry.

The welding surface is processed with turning and polishing technology, achieving surface roughness Ra≤0.8μm and flatness ≤0.03mm, improving welding matching and reducing leakage risks.

Pressure Performance Verification

Air Tightness Inspection

Every finished product undergoes 100% air tightness testing. The standard includes 10bar/30s pressure holding inspection to identify potential leakage risks before delivery.

Burst Pressure Testing

The product passes ≥30bar burst pressure verification, ensuring stable pressure-bearing capability under abnormal load conditions.

Combined with CPK≥1.67 batch stability control, XIAYI maintains consistent sealing performance for large-volume production.

Surface Protection Performance

Multi-Layer Anti-Corrosion Treatment

Although the end cap mainly works inside the shock absorber assembly, surface protection remains important during storage, assembly and long-term vehicle operation.

XIAYI applies phosphating, electrophoretic coating and powder coating processes. The three-layer protection system provides more than 500 hours salt spray resistance, helping prevent rust, coating damage and structural degradation.

Long-Term Vibration Stability

The optimized forming structure and protective coating maintain stable performance under continuous vibration environments. The product is designed to reduce risks including deformation, leakage and sealing degradation during long service periods.

Manufacturing Reliability

XIAYI implements PFMEA risk analysis throughout the production process, covering raw material inspection, deep drawing, edge processing, surface treatment and final testing.

Through three-level inspection procedures and five-step quality assurance processes, XIAYI controls production risks and ensures stable batch quality for OEM customers.

Real Industry Application Cases

New Energy Passenger Vehicle Project

A domestic new energy vehicle OEM's pure electric sedans pursue high vehicle durability and low after-sales failure rate. Ordinary tube caps are prone to micro-leakage and slight deformation after long-term urban bumpy vibration, leading to gradual attenuation of shock absorption performance.

After batch matching with XIAYI Deep Drawn End Caps, the products rely on four-stage uniform wall forming and 100% air tightness detection advantages. After 3 years of mass market real vehicle operation tracking, zero oil leakage and zero sealing failure occur. The shock absorber sealing-related failure rate is reduced by 96%, effectively improving vehicle driving smoothness and long-term durability.

Coastal Humid Environment Commercial Vehicle Case

Light commercial vehicles operating in coastal areas face dual tests of perennial salt fog corrosion and high-frequency load vibration. Ordinary tube caps have thin coating and poor material stability, which are easy to rust, peel and leak oil within 1--2 years.

A regional commercial vehicle parts supplier adopted XIAYI Deep Drawn End Caps in batches. Relying on 500-hour salt spray resistance three-layer coating and thick cold-rolled steel anti-fatigue substrate, the products operate stably in high-salt and high-humidity environments for a long time without rust deformation and sealing failure. The customer's annual after-sales replacement cost of shock absorber sealing parts is reduced by 88%.

Outdoor Construction Machinery Harsh Working Condition Case

Engineering machinery such as loaders and excavators works outdoors all year round, bearing strong vibration impact, mud erosion and variable pressure load, which puts forward extremely high requirements on tube cap pressure resistance and structural stability.

A construction machinery manufacturer adopted XIAYI Deep Drawn End Caps. The thickened cold-rolled steel substrate resists heavy pressure impact, and the precise forming process ensures stable pressure bearing. Long-term field verification shows that the products have no structural bulging, cracking or leakage failure, effectively ensuring the continuous and stable operation of engineering equipment shock absorption systems.

Product Application Range

XIAYI Deep Drawn End Cap is widely used in shock absorber sealing and pressure-supporting applications, covering passenger cars, SUVs, new energy vehicles, light commercial vehicles, heavy commercial vehicles, taxis and outdoor construction machinery.

XIAYI supports OEM and ODM customization according to customer requirements, including steel thickness, forming parameters, pressure standards and coating specifications to meet different operating conditions.

Product Comparison

Compared with conventional stamped tube caps, XIAYI focuses on improving forming consistency, sealing reliability and long-term pressure performance.

FAQ

Why choose a deep drawn end cap instead of a stamped end cap?

Deep drawing provides better material flow control and more uniform wall thickness compared with simple stamping. XIAYI uses multi-stage forming technology to reduce stress concentration and improve sealing reliability.

How does XIAYI prevent oil leakage problems?

XIAYI improves sealing performance through precise forming, edge finishing, welding surface optimization and 100% air tightness testing, reducing risks caused by dimensional deviation and poor sealing contact.

Can XIAYI customize end caps for different shock absorber designs?

Yes. XIAYI provides customized solutions including material thickness, forming parameters, dimensions and coating requirements according to different shock absorber structures and operating environments.

XIAYI Manufacturing Capability

Founded in 2006, XIAYI specializes in the research and production of high-precision shock absorber sealing and structural components. The company operates a 5000-square-meter standardized production base equipped with multi-stage deep drawing production lines and professional testing equipment.

With an IATF 16949:2016 compliant quality management system, XIAYI applies full-process quality control, PFMEA risk prevention and CPK≥1.67 production stability management. With more than 20 years of global export experience, XIAYI provides high-precision shock absorber component solutions for customers in more than 30 countries and regions.