Changdong is good at making metal stamping dies up to 4.2 meters, also we produce small size metal stamping toolings. The company manages the complete stamping die program from the CAE Simulation, layout designs and stamping tooling designs, and finish the machining to tryout and home line tryout to your hands. Meanwhile, the company produces the prototyping parts and stamping parts range from 45-880T. The successful cases include: stamping tools of Leoni connectors, automotive stamping dies of PSA P8 & B618, metal stamping toolings of Cummins exhaust pipe assembly, automobile stamping dies of NISSAN H60B projects, and stamping tools of car audio system, Canon printers, refrigerators, ovens and washing machines and so on.If you need metal stamping dies ,stamping parts or metal prototypings,
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Automotive drawing die adjustment is a critical step in producing high-quality cover panels, structural panels, and deep drawn automotive stamping parts. During tryout, engineers must control material flow, die clearance, blank holder force, drawbead resistance, and blank shape to reduce wrinkles, cracking, thinning, and surface defects.
Automotive cover parts are usually made from thin sheet metal with large size, complex shape, and high surface quality requirements. The drawing die directly affects the final appearance, dimensional accuracy, and forming stability of the stamped part.
A well-adjusted automotive drawing die can improve part quality, shorten die tryout time, reduce repeated tooling modification, and support stable production after delivery.
| Defect | Common Cause | Adjustment Focus |
|---|---|---|
| Wrinkling | Material flow is too easy or blank holder force is too low. | Increase local holding resistance, adjust drawbeads, optimize blank shape. |
| Cracking | Material flow is too restricted or tensile stress is too high. | Reduce resistance, improve radius, adjust clearance, review blank size. |
| Thinning | Excessive stretching in local areas. | Improve material feeding and rebalance forming force. |
| Surface Marks | Uneven die clearance, poor polishing, or unstable material flow. | Check die surface, clearance, lubrication, and contact pressure. |
The clearance between the punch and die directly affects the quality of deep drawn automotive panels. If the clearance is too large on one side, the side wall may wrinkle or show wave-like defects. If the clearance is too small, the material may be excessively thinned, increasing the risk of cracking.
During drawing die tryout, engineers should check whether the clearance is uniform around the forming area. Uneven clearance may also cause streaks, surface defects, and unstable wall thickness.
Blank holder force controls the resistance of material flow during drawing. A higher blank holder force can reduce wrinkles and improve part rigidity, but excessive force may cause cracking. A lower blank holder force allows easier material flow, but it may lead to wrinkling in low-deformation areas.
For complex automotive cover parts, deformation is not uniform around the part. Therefore, local blank holder force should be adjusted according to the forming condition of each area.
A practical adjustment principle is to increase material resistance in areas where wrinkles occur and reduce resistance in areas where cracking appears. The goal is not maximum holding force, but balanced metal flow.
When blank holder force is difficult to control, adjusting the binder surface gap can help stabilize material flow. The binder gap affects how much resistance the sheet metal experiences as it enters the die cavity.
In elongation deformation areas, the sheet may become thinner during forming. In compression deformation areas, the material thickness may increase, which can raise local resistance and increase cracking risk. This is why binder gap adjustment must be based on the actual deformation behavior of the part.
Drawbeads are used to control sheet metal flow during deep drawing. Proper drawbead design and adjustment can prevent excessive feeding, reduce wrinkling, and improve forming stability.
However, excessive drawbead resistance may restrict material flow and cause cracks. For automotive cover panel stamping, drawbead position, height, and resistance should be reviewed together with blank holder force and die clearance.
For asymmetrical automotive cover parts, material deformation is often uneven around the die opening. In addition to drawbead adjustment, engineers may need to optimize the blank shape before drawing.
The blank surface area should be close to the final part surface area.
The blank outline should follow the general shape of the drawn part.
The blank edge should be smooth and streamlined, avoiding sharp corners.
Areas with cracking may need more material feeding.
Areas with wrinkling may need reduced material allowance or higher holding resistance.
| Item | Check Point |
|---|---|
| Die Clearance | Is the punch and die gap uniform around the forming area? |
| Blank Holder Force | Is the holding force balanced between wrinkle-prone and crack-prone areas? |
| Drawbead | Does drawbead resistance match the actual material flow requirement? |
| Blank Shape | Is the blank outline smooth and suitable for stable drawing? |
| Surface Quality | Are there scratches, streaks, waves, or uneven contact marks? |
Drawing die adjustment is closely related to forming simulation, stamping DFM, die tryout, and deep drawing tooling. You may also read:
This downloadable technical file discusses drawing die adjustment for automotive cover parts, including wrinkle control, cracking prevention, die clearance, blank holder force, binder surface gap, and blank shape optimization.
Dongguan Changdong Tool & Die Co., Ltd. provides automotive stamping die manufacturing, drawing die development, deep drawing die, transfer die, progressive die, prototype die, stamping die tryout, and inspection support for automotive and industrial metal parts.
Our manufacturing capability includes CAE review, CNC machining, WEDM, grinding, high-speed drilling, die assembly, internal tryout, CMM inspection, 3D blue laser scanning, and 45T–800T press validation.
From a tooling manufacturer’s perspective, drawing die adjustment is not a single correction step. It is a systematic process involving material flow, binder resistance, die clearance, drawbead control, surface quality, and dimensional validation. A qualified tryout process can reduce later production risk and improve the final quality of automotive stamped panels.
Contact Changdong Tool & Die for automotive drawing die development, deep drawing die adjustment, stamping die tryout, CAE review, and custom stamping die manufacturing support.
Dongguan Changdong Stamping Dies CO., LTD. © copyright Add：NO. 56-B, Fuming South Road, Dalang, Dongguan, P.R.C
E-mail: sales@chang-dong.com Tel: 0086-769-8106 1256 Mobile: 0086-189 2949 4380 Sales Manager: Ms. Alice Fax: 0086-769-8106 1926
Dongguan Changdong Tool & Die Co., Ltd. is a custom metal stamping die and stamped parts manufacturer founded in 2012. We support automotive, home appliance, electrical and industrial projects from DFM review and die design to press tryout, sample validation and metal stamping production.
Main capabilities: Stamping Dies | Progressive Die | Transfer Die | Prototype Die | Prototype Tooling | Stamping Parts | Custom Metal Stamping Parts
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