Die Casting Die
Die casting die withstands cyclic high-temperature impact and molten metal scouring, ensuring stable quality for automotive brackets, transmission, 5G base station and motor housing production.
- Standard: Custom design per customer part drawing. Conforms to NADCA or customer specifications
- Technique: EAF+LF+VD or ESR steel, forged with multi-directional ratio ≥4. CNC machined from 3D model, EDM for intricate details. Insert design for high-stress areas
- Shape: Complex geometry matching part contour. Inserts, slides, cores, ejector pins integrated. Max envelope per customer machine capacity
- Heat treatment: Cavity inserts vacuum heat treated to 44–48 HRC. Post-weld stress relief mandatory. Nitriding or surface coating applied after final machining
- Surface Treatment: PVD coating (e.g., CrN, AlCrN) for solder resistance. Nitriding for surface hardness >1000 HV. Polished surface Ra ≤0.2 μm for non-critical areas
- Tolerance: Cavity dimensions: ±0.02 mm per 100 mm. Parting line flatness 0.02 mm/1000 mm. Slide fit clearance ≤0.02 mm
- MOQ: 1 set (complete die). Free trial and debugging support available
We supply Die Casting Die in various custom sizes
Core Quality Inspection
Inspection Item | Standard / Method | Acceptance Criteria / Typical Value | Description |
Material Certification & Ultrasonic Testing (UT) | EN 10204 Type 3.1 + ASTM A578 / EN 10160 | Certifies H13 / 1.2344 / 1.2367; No discontinuities ≥ 1.5 mm in cavity steel | Traceable mill certs ensure correct steel grade; UT scan guarantees the cavity steel is free from internal defects that lead to premature heat checking and cracking. |
Vacuum Heat Treatment Verification | NADCA #207 / ASTM E18 / ISO 6508 | 44–46 HRC for H13; Microstructure: fully tempered martensite, grain size ASTM 7 or finer | Verified quench & triple-temper process guarantees optimal hot strength, toughness, and resistance to heat checking under extreme thermal cycling. |
Surface Nitriding & Coating Integrity | ISO 4516 / Calotest / Microhardness | Diffussion zone depth: 0.10–0.15 mm; Surface hardness ≥1000 HV; No white layer or continuous compound layer | Controlled nitriding or PVD coating (CrN, AlCrN) verified for adhesion and depth, preventing washout and soldering from molten aluminum injection. |
Cavity Dimensional Inspection | CMM / 3D Scanner | ±0.02 mm per 100 mm cavity dimension; Parting line flatness 0.02 mm/1000 mm | Full cavity and insert geometry verified against 3D model to ensure as-cast dimensions are within tolerance, preventing flash and mismatch. |
Cooling Line Hydrostatic Test & Flow Check | Hydrostatic 20–30 bar / Flow meter | 20 bar for 30 min, zero pressure drop; Flow rate per design simulation | Leak-proof and balanced water circuits confirmed; ensures consistent die temperature control to avoid hot spots, distortion, and soldering. |
Note: In addition to the above core inspections, NingShing performs comprehensive quality checks including insert fit and interchangeability verification, sliding core function testing, residual stress analysis (hole-drilling method), visual and dimensional inspection of all ejector pin holes, and full die try-out report analysis. Every die is delivered with complete heat treatment records, material certificates, and a final inspection report, ensuring total traceability and immediate production readiness.
Main characteristics of Die Casting Die
- Excellent thermal fatigue resistance – resists heat checking under cyclic high-temperature impact
- High wear & erosion resistance – withstands high-speed molten metal scouring
- Precise dimensional accuracy – ensures tight tolerance for complex cast parts
- Good thermal conductivity – enables uniform heat dissipation for stable quality
Die Casting Die applications
Automotive Engine Bracket Die Casting Die
High-strength H13 tool steel and optimized cooling ensure the die withstands high-speed aluminum filling and thermal shock, delivering crack-resistant, dimensionally stable brackets for engine mounts.
Transmission Housing Die Casting Die
Precision cavity machining and advanced PVD coating minimize soldering and washout, enabling high-volume production of complex, leak-tight transmission housings with tight tolerances.
5G Base Station Housing Die Casting Die
Optimized gating and thermal management maintain uniform fill and rapid solidification for thin-wall, lightweight housings, meeting strict EMI shielding and dimensional requirements.
Motor Housing Die Casting Die
Deep cavity rigidity and conformal cooling channels ensure consistent internal geometry and surface finish, producing high-strength motor housings for EV and industrial drives with extended die life.
Our Production Technology For Die Casting Die
Parameter | Specification |
Material options | Premium ESR-grade hot work steels: USN (1.2343ESR), USD (1.2344ESR), HP1, CR7V-L, TQ1 |
Heat treatment | High-pressure vacuum quenching + 2–3 tempering cycles; solution treatment + aging for specialized grades |
Surface treatment | Nitriding, NSBP surface treatment, PVD coating (CrN, TiAlN), oxidation |
CAD/CAM capability | 3D programming using CAD, UG, Pro/E, Catia for complex cavity machining |
EDM capability | CNC wire EDM and sinker EDM for precision cavity details |
Tolerance | ±0.02 mm max |
Distinctive Characteristics vs. Mould Base
- Direct molten metal contact – Requires superior hot hardness and erosion resistance
- Complex cavity geometry – Demands 5-axis machining and EDM capabilities
- Tighter surface finish requirements – Critical for part release and surface quality
- More demanding heat treatment – Requires precise control to achieve 44–52 HRC while maintaining toughness
mechanical properties & heat treatment of Die Casting Die
| Heat temperature | Start forging temperature | Finish forging temperature | Cooling method |
| 1120–1150 °C | 1050–1100 °C | 900–850 °C | Pit or sand cooling |
Annealing
- 750 to 800°C (1382 to 1472°F)
- Slow controlled cooling in furnace at 10–20°C/h down to approx. 600°C, then air cool
- Hardness after annealing: max. 235 HB
Hardening
-
1000 to 1080°C (1832 to 1976°F) – select according to required balance:
1020–1050°C for maximum toughness (preferred for moulds)
1050–1080°C for maximum hot hardness (reduced toughness) - Oil, salt bath (500–550°C), or high-pressure gas quench (vacuum)
- Holding time: 15–30 minutes after temperature equalisation
- Hardness after quenching: 56–58 HRC
Stress relieving
- 600 to 650°C (1112 to 1202°F)
- Hold 1–2 hours in neutral atmosphere after thorough heating
- Essential for complex shapes to avoid distortion during hardening
Tempering
- Temper immediately after quenching (or after cryogenic treatment) to hand-warm temperature
- Holding time: 1 hour per 20 mm thickness, minimum 2 hours; air cool
- Minimum 2 tempers; 3 tempers strongly recommended for critical moulds
- 1st temper: 530–600°C (usually 580–600°C) to achieve secondary hardening
- 2nd temper: same range, adjust to target hardness
- 3rd temper: 30–50°C below the highest tempering temperature for stress relief
- Final hardness: 44–48 HRC (optimal balance of thermal fatigue and wear resistance); up to 52 HRC for specific applications
Deep Cryogenic Treatment (Optional but Recommended)
- Cool to -70°C to -80°C immediately after quenching, hold 2–4 hours
- Warm to room temperature naturally, then proceed to tempering
- Reduces retained austenite (<5%), improves dimensional stability and hardness
Why Choose NSPM as Your Die Casting Die Supplier
Source Direct
Direct mill cooperation ensures stable supply, competitive pricing, and consistent quality. Global resource integration and strong supply chain management guarantee reliable material sourcing and long-term availability.
Stock Ready
50,000+ tons inventory across 11 warehouses enables fast delivery. Flexible cutting, short lead times, and ready stock support urgent demands and improve customers’ production efficiency.
Expert Team
600+ professionals, including R&D specialists and technical engineers, provide application-driven support. Fast response and deep tooling knowledge ensure accurate solutions for diverse industrial needs.
Fully Inspected
Strict quality control system with full traceability, UT testing, and heat treatment records. Certified standards (ISO, CE) ensure every material meets high-performance and reliability requirements.
Full-Chain Machining
From steel supply to precision machining, heat treatment, and equipment manufacturing, NSPM offers integrated solutions that enhance accuracy, efficiency, and overall tooling performance.
