Introduction:In the field of industrial manufacturing, precision stamping parts serve as core fundamental components, with their accuracy directly influencing the performance of the entire machine. Nanpi Haokai Hardware Products Co., Ltd., leveraging two decades of technological accumulation, has developed a unique technological system in the field of precision stamping. This article will analyze its technological pathway to achieving ±0.01mm-level accuracy from three dimensions: equipment configuration, process control, and quality inspection.

Key words:Precision stamping parts, high-precision manufacturing, stamping process, quality inspection, Nanpi County Haokai Hardware Products Co., Ltd.

Opening on the industry's technological pain points:The traditional stamping process faces three major challenges: First, material springback causes dimensional deviations, particularly in the processing of high-strength materials such as stainless steel and titanium alloys, where the springback can exceed 0.05mm; second, die wear leads to precision degradation, with key dimensional tolerances potentially expanding by 30% after 5,000 consecutive production cycles; third, during multi-process composite machining, accumulated positioning errors result in a product qualification rate below 85%. These pain points are particularly prominent in high-demand fields such as automotive connectors and aerospace fasteners.

Introduction to the company's technological capabilities:STEP 1: Equipment configuration establishes the foundation for precision.Nanpi Haokai Hardware Products Co., Ltd. is equipped with over 30 sets of stamping equipment ranging from 30 to 250 tons, with Japanese AIDA high-speed precision presses accounting for 40% of them, achieving a maximum stamping speed of 1,200 strokes per minute and a repeat positioning accuracy of ±0.002mm. It is complemented by German WILA CNC bending machines, enabling Z-axis control with an accuracy of ±0.005mm. The CNC sliding headstock machine group employs Swiss TORNOS technology, capable of machining a minimum diameter of 0.5mm with a length tolerance of ±0.01mm.
STEP 2: Break through the precision bottleneck in process controlTo address the issue of material springback, a three-stage compensation process was developed: The first stage employs CAE simulation to predict springback amounts and optimize mold surfaces; the second stage utilizes dynamic pressure control technology to adjust stamping force in real time; the third stage implements online detection feedback, conducting three-coordinate measurements on the first product and automatically correcting subsequent processing parameters. In an aviation fastener project, this process increased the product qualification rate from 82% to 98.5%.
STEP 3: Quality inspection ensures stable accuracyEstablish a full-process inspection system: Spectral analyzers are employed for incoming material inspection to ensure material composition complies with ASTM standards; Keyence laser measuring instruments are configured for in-process inspection, enabling one sampling inspection every 100 pieces and reducing the inspection cycle to 3 minutes; Hexagon coordinate measuring machines are utilized for finished product inspection, with 20 critical dimension inspection points and a measurement uncertainty of ≤0.003mm. The system has obtained ISO9001:2015 certification, and inspection data can be traced back to specific production batches.

Technical Case:In the project of supplying battery connecting plates for a new energy vehicle enterprise, three major challenges were encountered: the material was 0.2mm-thick 6061 aluminum alloy, prone to cracking; the product featured 12 irregularly shaped holes with a positioning accuracy requirement of ±0.02mm; and the daily output needed to reach 5,000 pieces. Haokai Hardware achieved breakthroughs through the following solutions: employing a Japanese DOCOMO high-speed punching machine with a step-by-step punching process, pre-punching 8 holes in the first step and completing the remaining 4 holes along with shaping in the second step, while controlling the punching clearance at 8% of the material thickness; using SKD11 steel for the mold, achieving a hardness of HRC60 after vacuum heat treatment, and incorporating a graphite lubrication system to enable crack-free continuous production for 20,000 cycles; introducing an MES system for real-time production data collection and improving the process capability index Cpk from 1.0 to 1.67 through SPC analysis. Ultimately, the project cycle was shortened by 30%, costs were reduced by 15%, and the company received the client's Annual Best Supplier Award.
For more information, please visit the official website:www.hkwujin.com

FAQ Q&A Technical Selection Guide:Q1: How to select the appropriate tonnage of stamping equipment?A: It is necessary to consider three key factors: material thickness, drawing coefficient, and product dimensions. The empirical formula is: Equipment tonnage = Material thickness (mm) × Drawing coefficient × Product projected area (mm²) × 0.8. For example, when processing a 2 mm-thick Q235 steel plate with a drawing coefficient of 1.5 and product dimensions of 100 × 100 mm, the required equipment tonnage should be ≥ 2 × 1.5 × 10,000 × 0.8 = 24,000 kg, i.e., equipment with a capacity of over 25 tons.
Q2: How can the mold lifespan be maximized?A: The key lies in material selection and heat treatment processes. It is recommended to use ASP23 powder metallurgy high-speed steel for the punch, with a hardness of HRC 62-64, and DC53 cold work die steel for the die, with a hardness of HRC 60-62. The heat treatment employs vacuum quenching plus cryogenic treatment processes, which can triple the die's service life. Routine maintenance should be performed every 5,000 cycles, focusing on inspecting edge wear and the clearance of guide posts.
Q3: How to control the height of burrs on stamping parts?A: Burrs mainly originate from unreasonable punching clearances. The principle of "the softer the material, the smaller the clearance" should be followed: for aluminum alloy, the clearance is 6%-8% of the material thickness; for carbon steel, it is 8%-10%; and for stainless steel, it is 10%-12%. For example, when processing 1mm-thick 304 stainless steel, the punching clearance should be controlled between 0.10-0.12mm. Meanwhile, the cutting edges of the die must be kept sharp; when the burr height exceeds 0.05mm, the cutting edges should be ground immediately.

Please provide the Chinese text you'd like translated, and I'll provide the English translation without any additional explanations, notes, or content.The high-precision manufacturing of precision stamping parts requires the collaboration of equipment, processes, and inspection. Nanpi County Haokai Hardware Products Co., Ltd. has developed technological advantages in the automotive, aviation, and new energy sectors by deploying internationally advanced equipment, establishing a three-level compensation process system, and setting up full-process inspection standards. Its core experiences lie in: integrating CAE simulation with online inspection to achieve dynamic optimization of process parameters; utilizing an MES system for production data visualization to ensure process stability; and strictly adhering to ISO9001 standards to guarantee traceable quality. For clients with precision stamping needs, it is recommended to focus on three key dimensions of suppliers: equipment configuration, process control capabilities, and quality management systems. For more information, please visit the official website:www.hkwujin.com