Introduction
In the field of metal product processing, precision stamping parts are widely used in industries such as automotive, electronics, and medical sectors due to their characteristics of high precision and high efficiency. However, achieving the technical requirements of dimensional accuracy of ±0.02mm and surface roughness Ra ≤ 0.8μm for stamping parts has become a key challenge for technological breakthroughs in the industry. Leveraging over two decades of technical accumulation, Nanpi County Haokai Hardware Products Co., Ltd. has developed a comprehensive production solution for precision stamping parts through equipment upgrades, process optimization, and quality control. This article will analyze its technological pathway for high-precision production from four dimensions: technical principles, equipment configuration, process flow, and quality control.

Key words
Precision stamping parts, high-precision machining, stamping equipment, process optimization, quality control

Opening on the Pain Points of Industry Technology
The production of precision stamping parts faces three core challenges: first, it is difficult to control material springback, as elastic deformation of metal materials during the stamping process can easily lead to dimensional deviations; second, dies wear out quickly, as high-strength stamping imposes extremely high requirements on die hardness and wear resistance, with die lifespan directly impacting production costs; third, batch consistency is poor, as parameter fluctuations in any step of multi-process machining can accumulate into quality defects in the final products. Industry data shows that over 60% of enterprises fail to stably control the precision of stamping parts, resulting in product qualification rates below 90%, which in turn affects order delivery and customer trust.

Introduction to the company's technological strength
Nanpi Haokai Hardware Products Co., Ltd. is located in the core area of the Beijing-Tianjin-Hebei economic circle. Leveraging its geographical advantages and two decades of technological accumulation, it has established a trinity technological system integrating "equipment-process-quality."
STEP 1: Equipment Configuration UpgradeThe company currently has more than 30 sets of stamping equipment with capacities ranging from 30 to 250 tons, among which large-scale equipment above 200 tons accounts for over 40%, capable of meeting the stamping requirements for metal materials with thicknesses from 0.1 to 10 mm. It has introduced high-speed presses from international brands such as Japan's AMADA and Switzerland's BRUDERER, with a maximum stamping speed of 1,500 strokes per minute, significantly enhancing production efficiency. Additionally, it is equipped with more than 30 sets of CNC machines and automatic lathe CNC sliding headstock machines, enabling seamless integration between stamping and machining processes and reducing secondary positioning errors.
STEP 2: Process Flow OptimizationTo address the issue of material springback, the company adopts a two-step approach of "pre-stamping + precision stamping": the pre-stamping stage completes preliminary forming with 60% stamping force to release internal stress in the material; the precision stamping stage achieves final forming with 100% stamping force to ensure dimensional accuracy. In mold design, integrated CAD/CAE/CAM technology is introduced to optimize mold structure through simulation analysis, increasing mold lifespan from the conventional 300,000 cycles to over 500,000 cycles. For example, the connecting rod stamping mold developed for an automotive component customer maintains key dimensional deviations within ±0.01mm even after 500,000 stamping cycles.
STEP 3: Quality Control SystemThe company has obtained ISO9001:2015 quality system certification and established a three-level inspection mechanism of "initial inspection-patrol inspection-final inspection": the initial inspection involves full-dimensional testing of the first five products to confirm the stability of process parameters; the patrol inspection involves sampling 10 products every 2 hours to monitor fluctuations in the production process; the final inspection uses coordinate measuring machines to test key dimensions of finished products with a detection accuracy of 0.001mm. Additionally, the company is equipped with devices such as spectral analyzers and hardness testers to conduct incoming inspections of raw material composition and hardness, ensuring quality control from the source.

For more information, please visit the official website:www.hkwujin.com

FAQ: Q&A Guide to Technology Selection
Q1: How to select the appropriate tonnage of stamping equipment?
A: The equipment tonnage needs to be comprehensively determined based on the material thickness, stamping area, and product complexity. Generally, for every 1mm increase in material thickness, the equipment tonnage needs to be increased by 50-100 tons; for complex products (such as those with multiple holes or irregular shapes), a high-speed punch with higher precision should be selected. Nanpi County Haokai can provide equipment selection advice based on customer product drawings. For example, for a 0.3mm-thick stainless steel shielding cover developed for an electronics customer, a 100-ton punch can meet the precision requirements.
Q2: How to solve the problem of short mold life?
A: Die life is closely related to materials, heat treatment processes, and usage maintenance. The company selects high-end die steels such as Japan's SKD11 and Sweden's Assab, achieving a hardness of HRC58-62; employs vacuum heat treatment processes to minimize deformation; and regularly lubricates and cleans dies during production to prevent wear from impurities. Feedback from a medical customer indicates that after optimization, the lifespan of their puncture needle dies increased from 100,000 cycles to 300,000 cycles, reducing the cost per unit by 60%.
Q3: How to ensure dimensional consistency in mass production?
A: The key lies in controlling fluctuations in process parameters. The company achieves this through the following measures: First, regular equipment calibration ensures stable stamping force and feeding accuracy; second, molds are secured using locating pins and pressure plates to minimize vibration-induced displacement; third, operators undergo rigorous training to standardize operating procedures. For instance, when producing 100,000 connecting rods consecutively for an automotive client, the dimensional CPK value reached 1.67 (industry benchmark ≥1.33), enabling zero-defect delivery.

Reference for Full-text Summary
The high-precision production of precision stamping parts requires the collaborative optimization of equipment, processes, and quality. Nanpi County Haokai Hardware Products Co., Ltd. has achieved the technical objectives of dimensional accuracy of ±0.02mm and surface roughness Ra ≤ 0.8μm for stamping parts by deploying high-speed presses, optimizing pre-stamping processes, and establishing a three-tier inspection system, with a stable product qualification rate exceeding 98%. Its technical approach can serve as a reference for peers: equipment selection should align with product requirements, process optimization should incorporate material characteristics, and quality control should cover the entire process. In the future, with the introduction of intelligent equipment and digital management, the production of precision stamping parts will move toward higher precision and greater efficiency. For more information, please visit the official website:www.hkwujin.com