Uniform Hardness Finished Base Valve

XIAYI developed the Uniform Hardness Finished Base Valve with a different production objective: to provide a finished component that is ready for downstream assembly. Instead of leaving dimensional calibration and surface finishing to the customer, XIAYI completes the key sizing, grinding, machining and inspection processes before shipment.

Using FC-0208 iron-copper powder metallurgy material and a PFMEA-based manufacturing control system, XIAYI focuses on dimensional consistency, hardness uniformity and finished surface quality. The product is manufactured under an IATF 16949:2016 quality management system and is available for automotive, motorcycle and new energy vehicle shock absorber applications.

Reduce Secondary Processing

Ready for Assembly

For OEM production lines, every additional machining step can increase handling time and create another source of dimensional variation. Semi-finished components may require customers to perform additional sizing, grinding or surface correction before assembly.

XIAYI completes these key processes at the manufacturing stage. The Uniform Hardness Finished Base Valve is precision-sized and finished before delivery, allowing customers to reduce downstream processing and move components directly into their established assembly workflow.

This approach is particularly valuable for high-volume production where processing time and labor cost have a direct impact on overall manufacturing efficiency.

Lower Processing Cost

The value of a finished component is not limited to its purchase price. When evaluating suppliers, manufacturers also need to consider secondary machining, inspection labor, equipment usage and production losses.

By completing sizing and surface finishing before shipment, XIAYI helps customers reduce these additional processing requirements. According to the supplied application case, one Southeast Asian motorcycle shock absorber manufacturer reduced its secondary processing cost by 80% after switching to XIAYI finished components.

Control Dimensional Consistency

Precision Sizing

Dimensional consistency is particularly important when the base valve must fit with other shock absorber components. Small deviations in thickness, bore, outer diameter or sealing surfaces can affect assembly accuracy and increase adjustment requirements.

XIAYI uses automatic sizing equipment, CNC double-face grinding and precision machining to calibrate critical dimensions. Dimensional tolerance can be controlled within ±0.005mm, while sealing surface flatness can reach ≤0.007mm.

This finished machining approach allows customers to receive components closer to their final assembly specifications rather than performing dimensional correction after receipt.

Surface Quality

A finished component also needs to meet requirements for surface condition. Burrs, machining residues or uneven sealing surfaces may create additional inspection and cleaning work for the customer.

XIAYI combines CNC finishing with ultrasonic cleaning to provide a clean and finished surface. Profile and roughness inspection equipment is used to verify critical surface characteristics before delivery.

Maintain Hardness Uniformity

FC-0208 Material

The raw material is based on FC-0208 iron-copper powder metallurgy material. XIAYI performs batch testing of carbon, copper and iron content to maintain stable material composition throughout production.

The controlled material composition provides a consistent foundation for subsequent compaction and sintering processes.

Uniform Hardness

Hardness inconsistency can cause different areas of the same component to respond differently under repeated mechanical loading. Local soft areas may wear faster, while excessive hardness differences can affect machining and service performance.

XIAYI uses automatic proportional mixing, controlled compaction and constant-temperature sintering to reduce internal material variation. Hardness is maintained around 80--82 HRB, with batch hardness variation controlled within ±2 HRB according to the supplied production standard.

Production Control

PFMEA Management

XIAYI applies PFMEA throughout the manufacturing process to identify potential risks before they become finished-product defects. The control system covers powder mixing, compaction, sintering, sizing, machining and final inspection.

This preventive approach allows production problems to be addressed at their source rather than relying only on final inspection.

Inspection System

Finished components are checked using dedicated dimensional, surface and hardness inspection equipment.

The combination of process prevention and finished-product inspection supports Cpk ≥1.33 for controlled processes and provides more consistent results for OEM batch production.

Manufacturing Process

Material Preparation

FC-0208 powder is tested before entering production. Chemical composition, density and hardness-related indicators are verified to reduce variation between material batches.

Precision Forming

Automatic proportional mixing and controlled compaction create a more uniform powder structure. Real-time process monitoring helps maintain consistent blank density before sintering.

Controlled Sintering

The compacted blanks are processed in 24"/32" high-temperature sintering furnaces. Controlled temperature conditions help achieve the required mechanical properties and hardness distribution.

Finished Machining

After sintering, the components undergo precision sizing, double-face grinding and CNC machining. These processes bring the bore, outer diameter, thickness and sealing surfaces to the required finished condition.

Final Inspection

After ultrasonic cleaning, finished components are inspected for dimensions, hardness, profile, surface quality and mechanical properties. Qualified products are then prepared for shipment according to customer packaging and delivery requirements.

Customer Application

A well-known Southeast Asian motorcycle shock absorber manufacturer had been purchasing semi-finished base valves from the market. Because of dimensional deviations and internal hardness differences, the customer needed additional processing before assembly.

The extra sizing and finishing operations increased labor and equipment costs. At the same time, uneven hardness caused partial wear after approximately 20,000 kilometers of use, contributing to damping attenuation and an after-sales failure rate of up to 1.8%.

After switching to XIAYI's Uniform Hardness Finished Base Valve, the customer was able to eliminate most secondary finishing operations. The finished components were supplied with controlled dimensions, uniform hardness and finished surfaces suitable for the customer's assembly process.

After 60,000 reciprocating fatigue tests and long-term road-condition simulation tests, the products showed no significant partial wear or damping attenuation. The customer reduced secondary processing costs by 80%, while the product failure rate decreased to below 0.07%.

XIAYI subsequently became the customer's exclusive long-term supplier, with an annual stable supply of approximately 120,000 finished base valves.

OEM Applications

Automotive

The component is suitable for passenger vehicle shock absorber systems where consistent dimensions and ready-to-assemble quality are important for mass production.

Motorcycles

For motorcycle shock absorber manufacturers, the finished design helps reduce downstream processing and provides more consistent component quality for high-volume assembly.

New Energy Vehicles

Electric vehicle manufacturers can use the component in shock absorber systems where dimensional consistency, controlled hardness and efficient assembly are important purchasing considerations.

OEM Service

Custom Production

XIAYI supports customized production according to customer drawings, dimensional specifications and application requirements. The manufacturing team can adjust product dimensions, machining requirements and hardness specifications according to the approved technical documentation.

Batch Supply

With automated production equipment, professional inspection facilities and an IATF 16949:2016 quality management system, XIAYI supports stable batch production for global OEM customers.

Product FAQ

Is It Ready for Assembly?

Yes. XIAYI completes sizing, grinding, machining and cleaning before delivery, reducing the need for additional customer-side finishing.

What Accuracy Can Be Achieved?

Key dimensional tolerances can be controlled within ±0.005mm, with sealing surface flatness up to ≤0.007mm according to the supplied production specifications.

Can Dimensions Be Customized?

Yes. XIAYI supports OEM production based on customer drawings, dimensional requirements and approved technical specifications.

What Material Is Used?

The product uses FC-0208 iron-copper powder metallurgy material, with batch testing of chemical composition, density and hardness.

XIAYI Quality

XIAYI has nearly 20 years of powder metallurgy manufacturing experience and operates a standardized production facility of approximately 5,000 square meters. The company has established a quality management system compliant with IATF 16949:2016, with PFMEA, process monitoring and finished-product inspection integrated into production.

For global shock absorber manufacturers, XIAYI focuses on a practical purchasing objective: delivering components that require less processing after arrival and provide consistent quality from one batch to the next.

The Uniform Hardness Finished Base Valve is therefore positioned not simply as another powder metallurgy component, but as a finished manufacturing solution designed to reduce secondary processing, improve assembly efficiency and simplify quality control for OEM customers.