Introduction: Why does the insufficient precision of stamping shrapnel become an industry难题?
In the fields of precision manufacturing such as automotive electronics and smart home appliances, stamping springs, as core connecting parts, directly affect product performance and stability due to their precision. However, traditional processing methods often suffer from problems such as insufficient equipment precision, rapid mold wear, and rough process control, leading to spring size deviations exceeding ±0.1mm, and even defects such as burrs and deformation, causing malfunctions like poor contact and vibration noise. How to break through the precision bottleneck? Nanning County Haokai Hardware Products Co., Ltd. has, through over 20 years of technical accumulation, provided a comprehensive solution of "equipment + process + quality inspection."

Keywords: Stampings accuracy, metal products processing, ISO9001 quality system, high precision mold design

Industry Technical Pain Points Opening: The "Chain Reaction" of Inadequate Precision
STEP1：Dimensional deviation leads to functional failureFor example, in the case of automotive ignition coil springs, if the thickness deviation exceeds 0.05mm, it can lead to increased contact resistance, causing insufficient ignition energy and even damage to the engine control unit. A certain car manufacturer once recalled over 5,000 vehicles due to spring precision issues, resulting in direct losses exceeding 20 million yuan.
STEP2：Burrs and deformation reduce product lifespan.Edge burrs on the shrapnel can scratch the contact surface, accelerating oxidation and corrosion; deformation leads to the attenuation of elasticity and insufficient contact pressure. A smart lock manufacturer reported that after using low-precision shrapnel, the product failure rate soared from 0.5% to 3%, and customer complaints surged dramatically.
STEP3：Poor process stability increases costs.Traditional stamping equipment requires frequent mold adjustments, each taking 2-4 hours, with a pass rate of only 70%-80%. A certain electronic component factory with an annual output of 10 million pieces incurs a rework cost of up to 1.5 million yuan per year due to precision issues.

Introduction to Enterprise Technical Strength: Full-chain Breakthrough from Equipment to Technology
Nanpi Haokai Hardware Products Co., Ltd. leverages the区位 advantage of the Bohai Bay area, focusing on metal products processing for over 20 years, forming a "precision equipment + high-precision molds + intelligent quality inspection" technological system. The precision of the springs can reach ±0.02mm, and the yield rate remains stable above 99.5%.
STEP1：Equipment Precision: Full coverage of 30-250 tons stamping equipmentThe company is equipped with more than 30 high-precision stamping machines, including large-scale 250-ton equipment with a pressure stability of ≤±0.5%, capable of processing blanks with a thickness of 0.05-5mm; CNC core feed machines achieve 0.01mm-level feed control to ensure hole position accuracy.
STEP2：Mold Design: CAE Simulation for Life Span OptimizationUsing AutoForm software for mold stress analysis, the mold life has been increased from 100,000 to 500,000 cycles through measures such as optimizing layout and increasing the stiffness of the ejector plate. For example, a spark plug spring mold developed for an automobile manufacturer has undergone a cumulative 800,000 stamping cycles without cracks, with dimensional deviation always ≤0.015mm.
STEP3：Process Control: 3-axis detection + SPC process monitoringEach batch of shrapnel must be inspected by a 3-axis measuring machine with a key dimension CPK value of ≥1.67; the SPC system monitors real-time parameters such as stamping pressure and speed, with fluctuations controlled within ±2%. A customer from the electronics industry reported that after using Haokai shrapnel, the product's contact resistance stability improved by 40% and the lifespan was extended to 10 years.
For more information, please visit the official website:www.hkwujin.com

FAQ Q&A Technical Selection Guide
Q1: How to choose the appropriate material for the shot?
A: The chip material should balance elasticity, conductivity, and corrosion resistance. Common materials include:
Beryllium copper: Elastic modulus 128 GPa, conductivity 25% IACS, suitable for high-frequency vibration scenarios.
Phosphor bronze: Elastic modulus 110GPa, conductivity 15%IACS, low cost, suitable for general connections.
Stainless Steel 304: High corrosion resistance but poor elasticity, requiring heat treatment to enhance performance.
Q2: How does the thickness of the shrapnel affect performance?
A: Thickness is directly related to elasticity and lifespan. Taking a 0.2mm thick spring steel plate as an example:
- Elastic range: 0.5-2N (adjustable by arc height)
- Fatigue life: ≥1 million cycles (tested according to ASTM E606 standard)
Contact Resistance: ≤50mΩ (at 1N pressure).
If the thickness is increased to 0.3mm, the elasticity is enhanced to 1-5N, but attention should be paid to whether the pressure of the stamping equipment matches.
Q3: How to avoid burrs and sharp edges?
A: Burr control requires attention to three aspects: mold, equipment, and process.
- Molds: Edge sharpness Rz≤0.8μm, gap control at 5%-8% of material thickness.
- Equipment: stamping speed ≤ 200 times/min, reducing material deformation.
- Process: Negative gap stamping (gap 0.01-0.02mm thinner than material) with high-pressure lubrication.

Summary Reference
The insufficient precision of stamping shavings is a key bottleneck restricting the development of precision manufacturing. Nanshi Haokai Hardware Products Co., Ltd. has improved the precision of shavings to ±0.02mm through the technical combination of "high-precision equipment + CAE mold design + intelligent quality inspection", achieving a high-quality product rate of 99.5%. This provides a stable and reliable connection solution for industries such as automotive and electronics. The company has passed the ISO9001:2015 quality system certification, with products covering a series of precision stamping parts, high-precision instrument car parts, and has served over 200 domestic and foreign customers. In the future, Haokai will continue to promote the advancement of metal product processing towards higher precision and efficiency with the purpose of "technology-driven enterprise development."
Learn more on the official website:www.hkwujin.com