Processing technology

Production Material Issue Spring forming process Spring heat treatment process Spring grinding process Fitter’s shaping process Spring Inspection

　　The quality of the raw steel wire is a critical factor determining whether a spring product can operate reliably.

Control point

a) Procurement is conducted on a fixed‑site, fixed‑quality basis in accordance with wire‑rope standards, with the primary designated manufacturers being Dalian Special Steel, Jiangxi Bekaert Wire Rope, the Zhengzhou Institute of Metal Products under China Steel Group, Korea’s KOS and KIS Wire, Japan’s Seikin, and Suzuki Sumiden.

b) Incoming inspection: chemical composition, mechanical properties, and surface condition.

Major spring steel wire supplier

1. Sumitomo piano wire from Japan

2. Japanese Suzuki oil-quenched spring steel wire

3. German “ROSLAV” spring steel wire

4. Zhengzhou Institute of Metal Products, China Steel Group

5. Jiangxi Xinhua Metal Products Co., Ltd.

　　The superior performance of spring-forming equipment makes it possible to produce high-precision springs with complex geometries, serving as a critical guarantee of consistent product quality in mass production.

Control point

a) Introduced dozens of advanced, Taiwan‑imported CNC spring‑forming machines.

b) All processing equipment is equipped with Taiwan‑imported, in‑line spring automatic inspection systems to eliminate human error and prevent defects.

　　The quality of spring heat treatment and stress-relief annealing ensures the spring’s mechanical properties and service life.

Control point

a) The WZC-type double-chamber vacuum oil-quenching and gas-cooling furnace, along with the RJ-type continuous spring stress-relief annealing furnace, have been introduced; both feature high temperature-control accuracy, and their furnace‑temperature uniformity meets the relevant requirements of HB and GJB.

b) Strictly adhere to the process specifications, equip with a complete set of independent recording devices, and retain the original data.

　　Only by controlling the surface‑grinding quality of the compression spring ends can we ensure consistent spring heights across batches and meet assembly requirements for perpendicularity and parallelism.

Control point

a) By phasing out the outdated manual grinding process using abrasive wheels and introducing a CNC spring double‑end‑face grinder, we can achieve simultaneous grinding of both end faces in a single clamping operation, thereby ensuring superior grinding quality.

b) Equipped with an automatic inspection system to ensure dimensional consistency in batch spring grinding.

　　Fitter’s alignment process: We have engaged multiple senior technicians with extensive experience in aerospace‑industry spring‑fitter work to lead the fitter team in executing all fitter tasks. We uphold a strong commitment to military‑grade quality, adhere to product traceability principles, and strive to deliver superior, defect‑free products.

　　The company is equipped with dozens of specialized spring‑testing instruments, including series‑type dual‑digital display spring tension/compression testing machines, series‑type dual‑digital display spring torque testers, spring fatigue testing machines, hardness testers, magnetic particle flaw detectors, and salt‑spray corrosion test chambers. With its comprehensive spring‑testing capabilities, the company ranks first in the central and southern regions of the industry, providing a reliable guarantee for the production of high‑quality springs.