When a global automotive OEM needs a new stamped component, the decision of where to source it often comes down to a simple question: who can manage the entire process — from tooling design to final production — under one roof? In an industry where custom sheet metal parts must meet exacting dimensional tolerances, tight production schedules, and rigorous quality standards, the answer increasingly points to vertically integrated manufacturing partners.

DIAN STAMPING, operating under LINHAI DIAN MOULD CO., LTD in Taizhou, Zhejiang, China, has built its reputation around exactly this model. With more than 20 years of industry experience and a 50,000 m² modern facility, the company offers a complete in-house workflow that spans die design, stamping, welding, inspection, and assembly — eliminating the inefficiencies of multi-vendor coordination.

Every high-quality stamped part begins with a well-engineered stamping die. DIAN STAMPING's in-house die workshop spans approximately 4,000 m² and is staffed by around 35 skilled die designers and technicians. Using advanced CAD/CAM software including AutoCAD, SolidWorks, and CATIA, the engineering team designs progressive, transfer, and tandem dies tailored to each customer's specific part geometry and material requirements.

Progressive dies allow multiple operations — blanking, forming, punching, coining, and cutoff — to be completed in a single press pass, dramatically improving throughput for high-volume production. Transfer dies handle complex large and medium-sized parts that require deeper draws and more intricate forming sequences. Tandem dies are purpose-built for car body structural components formed from high-tensile materials, ensuring consistent part geometry across long production runs.

With an annual production capacity of approximately 2,000 sets of medium and small stamping dies and an annual die turnover of roughly RMB 50 million, DIAN STAMPING is equipped to handle projects ranging from prototype development to high-volume production runs. The company's in-house stamping capabilities include laser cutting, bending, welding, and powder coating — providing a complete custom sheet metal parts solution under one roof.

This vertical integration delivers tangible benefits. By controlling the entire process chain internally, DIAN STAMPING eliminates the lead time and quality variability that arise when tooling is made at one factory and transferred to another for production. Customers receive stamped parts directly from the same team that built the dies, ensuring that any dimensional adjustments or process optimizations are resolved quickly and collaboratively.

Quality assurance in automotive stamping goes far beyond visual inspection. DIAN STAMPING's quality management system is ISO 9001 certified and follows IATF 16949-oriented practices. The company produces its own checking fixtures alongside press dies, delivering them as a matched set so that every stamped part can be verified against GD&T-compliant inspection criteria immediately after production.

For automotive stamping dies and sheet metal components, the checking fixture is a critical quality tool. It enables rapid, repeatable dimensional verification of complex part geometries, catching deviations before they compound downstream. DIAN STAMPING provides custom-engineered checking fixtures designed specifically for each part, covering body-in-white, door systems, seating systems, instrument panels, chassis systems, and more.

Beyond stamping, DIAN STAMPING offers welding jig design and fabrication, robotic MIG welding, spot welding, and manual welding techniques. Welding assemblies and sub-assemblies are produced using custom jigs that ensure repeatable positioning and consistent weld quality across every unit. The company also provides assembly services, making it a true one-stop partner for customers who need finished components ready for direct integration into their production lines.

Typical lead times are 30–40 days for steel stamping dies and approximately 70 days for casting stamping dies, depending on project complexity. Prototype services are available, and customization can be initiated from 2D drawings, 3D data, or physical samples.

DIAN STAMPING's portfolio spans multiple automotive systems, reflecting deep domain expertise in sheet metal forming and assembly:

The company serves OEM customers including KIA, BYD, Toyota, Honda, Suzuki, and Geely, and exports to more than 10 countries worldwide. This global footprint demonstrates the ability to meet varying regional quality standards, packaging requirements, and logistics demands.

For procurement and engineering teams evaluating new supply partners, the vertically integrated model offers several structural advantages: