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Qingdao Hailong Machinery Technology Co., Ltd. is one of the leading manufacturers and suppliers of bending dies in China, featured by quality products and good service. Welcome to buy durable bending dies made in China here and get pricelist from our factory. Also, customized service is available.

Core Product Features

Process-specific & Diverse Shapes: Designed exclusively for metal sheet bending, it can realize various forming shapes such as V-shape, U-shape, Z-shape, arc and multi-angle bending, adapting to the bending processing of flat parts, curved parts and special-shaped parts. No subsequent shaping is required, with high precision in one-time forming, solving the problems of large rebound and angle deviation in traditional bending.
Premium Material & Wear/Fatigue Resistance: Punch/die adopts high-performance cold work die steel such as Cr12MoV, SKD11 and DC53, treated with vacuum quenching + deep cryogenic treatment, hardness ≥HRC60, compressive strength ≥2500MPa, excellent wear resistance, capable of withstanding high-frequency bending impact; mold base adopts 45# steel and S50C steel, high rigidity and small deformation, ensuring mold guiding and positioning precision.
Precision Forming & Anti-rebound Optimization: Rebound compensation design is carried out through CAE simulation, bending angle tolerance ≤±0.1°, fillet dimension tolerance ≤±0.05mm, flatness ≤0.02mm/m, bending parts have no wrinkles or cracks, surface roughness Ra≤1.6μm, good dimensional consistency, product qualification rate ≥99.2%.
Optimized Structure & Efficient Mass Production: Integrates automatic feeding, ejection and limiting mechanisms, suitable for automated production lines, bending frequency up to 50-800 times/minute (adjusted according to mold complexity); optimized guiding structure (ball guide pillars and bushes) and positioning device (precision positioning pins), positioning precision up to ±0.005mm, single mold life ≥400,000 times (ordinary sheets), ≥250,000 times (high-strength sheets).
Multi-material Adaptation & Flexible Customization: Suitable for metal sheets such as carbon steel, stainless steel, aluminum alloy and copper alloy (thickness 0.1mm-15mm). It can customize punch/die shape, bending angle, fillet radius and positioning method according to customer workpiece drawings, meeting mass bending processing needs of automotive parts, electronic components, hardware accessories, home appliance casings, etc.

Core Process Advantages

Digital Design & Simulation: Uses 3D modeling with UG and AutoCAD, combined with DEFORM and DYNAFORM bending simulation analysis to simulate sheet bending deformation, rebound process and mold force, optimize punch/die angle, fillet radius and rebound compensation, mold test pass rate ≥97%, and sampling cycle shortened by 30%.
Precision Machining & Manufacturing: Equipped with advanced equipment such as 5-axis machining centers, WEDM, EDM and surface grinders, punch/die machining precision reaches ±0.003mm, mold surface treated with mirror polishing to avoid scratching the sheet surface and ensure the appearance quality of bending parts.
Full-process Quality Control: Raw materials undergo spectral analysis, hardness testing and compressive strength testing; processing process real-time monitors cutting parameters and heat treatment temperature; finished products pass coordinate measuring, bending angle testing, rebound testing and life simulation testing. Complete test reports are provided for each batch with traceable quality.

Application Scenarios

Automotive Industry: Body frame bending dies, door frame bending dies, chassis part bending dies, new energy vehicle battery tray edge bending dies, etc.
Electronic Industry: Mobile phone middle frame bending dies, 5G base station accessory bending dies, connector housing bending dies, circuit board bracket bending dies, etc.
Hardware Industry: Furniture hardware bending dies, construction hardware bending dies, tool accessory forming dies, kitchenware edge bending dies, etc.
Home Appliance Industry: Air conditioning casing bending dies, washing machine panel bending dies, refrigerator frame forming dies, small home appliance handle bending dies, etc.
Other Fields: Medical device metal part bending dies, aerospace auxiliary structural part bending dies, marine accessory forming dies, etc.

Typical Application Cases

Automotive Industry - Body Frame Bending Die: Customized SKD11 material bending die for a leading automotive enterprise, adapted to 2.0mm high-strength steel plate bending, bending angle 90°±0.05°, fillet radius R3.0±0.03mm. 800,000 workpieces have been mass-produced, with no obvious wear on the mold and rebound controlled within 0.08°.
Electronic Industry - Mobile Phone Middle Frame Bending Die: Supplied DC53 material precision bending die, adapted to 0.8mm aluminum alloy sheet bending, bending shape is a combination of U-shape and arc, positioning precision ±0.004mm, no scratches on the surface of bending parts. Annual supply of over 60 sets of molds, supporting electronic manufacturers with annual capacity of 8 million middle frames.
Hardware Industry - Furniture Accessory Forming Die: Customized Cr12MoV material multi-angle bending die, adapted to 1.5mm stainless steel sheet processing, realizing 3 consecutive bending forming, bending frequency 200 times/minute, single mold life over 500,000 times. Customer production efficiency improved by 35%, scrap rate reduced to below 0.5%.

Quality Assurance

Test Reports: Provide raw material quality reports, mold dimensional accuracy test reports, punch/die hardness test reports, bending angle test reports, rebound test reports, etc.
After-sales Commitment: For non-human damage, mold warranty is 1 year or agreed bending times (whichever comes first, minimum 250,000 times); provide free mold maintenance guidance, punch/die grinding services, bending process optimization support, and lifelong mold repair and renovation services.
Quality Standards: Strictly comply with domestic and foreign industry standards such as GB/T 14661 Technical Conditions for Bending Dies, GB/T 3098.1 Mechanical Properties of Die Steels, ISO 286 Dimensional Tolerance Standards, JIS B 0401 Japanese Bending Die Standards.

Main Technical Specifications (Standard Models)

Parameter Type	Specification Range
Mold Type	V-shape Bending Die, U-shape Bending Die, Z-shape Bending Die, Arc Bending Die, Multi-angle Bending Die, Progressive Bending Die
Mold Material	Punch/Die: Cr12MoV, SKD11, DC53;Mold Base: 45# Steel, S50C, QT500-7
Adaptable Sheets	Carbon Steel, Stainless Steel, Aluminum Alloy, Copper Alloy, etc. (Thickness 0.1mm-15mm)
Key Accuracy	Bending Angle Tolerance ≤±0.1°;Fillet Dimension Tolerance ≤±0.05mm;Flatness ≤0.02mm/m
Service Life	Ordinary Sheets ≥400,000 Times;High-strength Sheets ≥250,000 Times;Precision Electronic Parts ≥300,000 Times
Bending Frequency	50-800 Times/Minute (Adjusted according to mold complexity and sheet thickness)
Adaptable Bending Radius	R0.5mm-R20mm (Customizable according to customer needs)
Customization Range	Punch/Die Shape, Bending Angle, Fillet Radius, Positioning Method, Feeding Path, Ejection Mechanism