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

Core Product Features

High-quality Mold Materials & Wear/Impact Resistance: Optional materials include mold steel (Cr12MoV, DC53, SKD11), high-speed steel (W6Mo5Cr4V2), cemented carbide (YG15/YG20), stainless steel (304/316L) to meet different processing scenarios. Cr12MoV mold steel has hardness ≥HRC60, excellent wear resistance, suitable for stretching of medium and thick plates (2-10mm); DC53 mold steel balances toughness and hardness, impact resistance ≥2000J/cm², suitable for stretching of complex-shaped workpieces; cemented carbide molds have hardness ≥HRA89, wear resistance 3-5 times that of ordinary mold steel, suitable for mass high-precision stretching; stainless steel molds have strong corrosion resistance, suitable for stretching processing in humid/acid-base environments.
Optimized Structure & Precise Molding: Through CAE simulation design, adopt "punch + die + blank holder + guiding mechanism" integrated structure, mold gap precision reaches ±0.01mm, workpiece molding dimensional tolerance ≤±0.03mm; blank holder adopts elastic/rigid design, blank holder force (5-50kN) can be adjusted according to material characteristics, effectively preventing workpiece wrinkling and cracking; guiding mechanism adopts ball guide pillars and bushes, guiding precision ≤0.005mm/m, ensuring stable mold movement and improving molding consistency.
Multi-material Adaptation & Wide Scenarios: Compatible with stretching of cold-rolled steel plate, stainless steel plate, aluminum plate, copper plate, aluminum alloy, plastic and other materials, thickness adaptation range 0.1-12mm; can realize stretching of complex-shaped workpieces such as cylindrical, rectangular, special-shaped, deep cavity, stretching depth up to 500mm (800mm for customized models); suitable for single stretching, multi-pass stretching, reverse stretching and other processes, meeting processing needs of different products such as auto body panels, construction machinery parts, home appliance shells, hardware products.
Precision Processing & Long-term Durability: Adopt CNC milling, electrical discharge machining (EDM), wire electrical discharge machining (WEDM), grinder finishing and other processes, mold cavity surface roughness Ra≤0.05μm, no tool marks or burrs; key working parts undergo strengthening treatments such as nitriding, quenching, PVD coating (TiN/TiAlN), surface hardness increased by 30%-50%, wear resistance and anti-adhesion; mold service life: ordinary mold steel ≥50,000 times, DC53/SKD11 ≥100,000 times, cemented carbide ≥500,000 times, suitable for mass continuous production.
Intelligent Adaptation & Easy Operation: Includes five core series: standard type, high-precision type, wear-resistant type, deep cavity special type, special-shaped customized type. Standard type is suitable for stretching of conventional materials and shapes; high-precision type (tolerance ≤±0.02mm) is suitable for precision parts processing; wear-resistant type (cemented carbide material) is suitable for mass production; deep cavity special type optimizes blank holder structure and lubrication channels, suitable for deep cavity workpiece stretching; special-shaped customized type can design exclusive cavity structure and guiding method according to workpiece drawings, compatible with automatic production line installation.

Core Process Advantages

Precision Molding Technology: Cavity adopts EDM + mirror grinder finishing, dimensional accuracy error ≤0.005mm, smooth surface without defects, reducing workpiece adhesion and scratches; guiding mechanism adopts precision ball guide pillars and bushes, combined with grease injection channels, low movement resistance and wear; blank holder adopts CNC turning + heat treatment strengthening, flatness error ≤0.01mm, ensuring uniform blank holding.
Surface Strengthening Technology: Mold steel undergoes quenching + tempering + nitriding treatment, nitrided layer thickness 0.1-0.3mm, hardness HRC62-65, improving wear resistance and fatigue resistance; cemented carbide molds undergo vacuum sintering + precision grinding, dense structure without pores, wear resistance and impact resistance; some molds can be customized with PVD coating treatment, coating thickness 3-5μm, reducing friction coefficient, preventing workpiece scratch, and extending mold life.
Full-process Quality Control: Raw materials undergo material spectral analysis, hardness testing, impact testing; the production process real-time monitors cavity dimensions, guiding precision, surface roughness; finished products pass mold trial testing, life testing, dimensional stability testing, wear resistance testing, complete test reports and mold trial samples are provided for each batch, and quality is traceable.

Application Scenarios

Automotive Industry: Stretching of auto body panels such as engine hoods, doors, fenders, and structural parts such as gearbox housings, fuel tanks, brackets, compatible with cold-rolled steel, aluminum alloy and other materials, requiring high precision and consistency.
Construction Machinery Industry: Stretching processing of excavator bucket teeth, crane hooks, frame accessories, etc., compatible with high-strength steel, alloy structural steel and other materials, requiring molds to be wear-resistant and impact-resistant, suitable for medium and thick plate stretching.
Home Appliance Industry: Stretching of refrigerator shells, washing machine inner tubs, air conditioner outdoor unit shells, etc., compatible with cold-rolled steel, stainless steel, aluminum plates and other materials, requiring smooth surface without scratches, suitable for mass production.
Hardware Products Industry: Stretching processing of kitchenware, tableware, hardware tools, pressure vessels, etc., compatible with various materials and complex shapes, requiring strong mold adaptability and high molding efficiency.
New Energy Industry: Stretching of new energy vehicle battery shells, motor housings, charging pile accessories, etc., compatible with lightweight materials such as aluminum alloy and stainless steel, requiring high precision and corrosion resistance.

Typical Application Cases

Auto Body Panel Stretching Mold: Customized engine hood outer panel stretching mold for a well-known automobile manufacturer, adopting DC53 mold steel, cavity processed by mirror grinder + TiAlN coating, mold gap 0.02mm, workpiece molding dimensional tolerance ±0.03mm, surface roughness Ra≤0.08μm, has been mass produced 50,000 sets, mold life up to 120,000 times, product qualification rate 99.8%.
Construction Machinery Thick Plate Stretching Mold: Customized excavator bucket tooth stretching mold for construction machinery enterprises, adopting Cr12MoV mold steel + nitriding treatment, suitable for stretching of 10mm thick Q355B steel plate, blank holder force 35kN, stretching depth 300mm, mold impact resistance up to 2200J/cm², has been supporting production 80,000 sets, mold failure rate less than 0.05%.
New Energy Battery Shell Stretching Mold: Customized aluminum alloy battery shell stretching mold for new energy vehicle enterprises, adopting cemented carbide (YG18) material, suitable for stretching of 1.5mm thick 6061-T6 aluminum alloy, molding dimensional tolerance ±0.02mm, mold life up to 600,000 times, has been batch supporting new energy vehicle models, production efficiency increased by 30%.

Quality Assurance

Test Reports: Provide raw material quality reports, mold dimensional accuracy test reports, hardness test reports, surface roughness test reports, mold trial test reports, life test reports, etc.
After-sales Commitment: For non-human damage, ordinary mold steel molds are warranted for 1 year, DC53/SKD11 molds for 2 years, and cemented carbide molds for 3 years; free repair or replacement is provided for quality problems such as excessive mold wear, dimensional deviation, and cracking during the warranty period; a professional technical team is online 24/7 to provide mold trial guidance, mold maintenance training, and process optimization solutions.
Quality Standards: Strictly follow industry standards such as GB/T 1298《Technical Conditions for Cold Work Die Steels》, GB/T 18449.1《Cemented Carbides - Designation, Chemical Composition and Physical Mechanical Properties》, GB/T 2828.1《Sampling Procedures for Inspection by Attributes》, ISO 8062《Geometrical Product Specifications (GPS) - Linear Size Tolerances》.

Main Technical Specifications (Standard Models)

Parameter Type	Specification Range
Material Type	Mold Steel (Cr12MoV/DC53/SKD11), High-speed Steel (W6Mo5Cr4V2), Cemented Carbide (YG15/YG20), Stainless Steel (304/316L)
Core Performance	Hardness ≥HRC60 (Mold Steel);≥HRA89 (Cemented Carbide);Impact Resistance ≥2000J/cm² (DC53)
Structural Parameters	Mold Gap Precision: ±0.01mm;Guiding Precision ≤0.005mm/m;Stretching Thickness: 0.1-12mm;Stretching Depth ≤500mm (800mm Customizable)
Precision Level	Ordinary Level (Tolerance ±0.05mm), High-precision Level (Tolerance ±0.03mm), Ultra-high Precision Level (Tolerance ±0.02mm)
Service Life	Ordinary Mold Steel ≥50,000 Times;DC53/SKD11 ≥100,000 Times;Cemented Carbide ≥500,000 Times
Adaptable Materials	Cold-rolled Steel, Stainless Steel, Aluminum Plate, Copper Plate, Aluminum Alloy, Plastic, etc.
Product Types	Standard, High-precision, Wear-resistant, Deep Cavity Special, Special-shaped Customized
Adaptable Equipment	Ordinary Punch Press, Hydraulic Stretching Machine, CNC Stretching Machine, Automatic Production Line