INDUSTRY COMPONENT

Fixed Die Half (Cover Die)

Stationary half of a die casting die that contains the cavity and is mounted to the fixed platen of the die casting machine.

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Component Specifications

Definition
The Fixed Die Half, also known as the Cover Die or Stationary Die, is the non-moving component of a die casting die assembly. It is securely mounted to the stationary platen of the die casting machine and contains the cavity side of the mold. This half typically houses the sprue bushing, through which molten metal is injected, and may incorporate cooling channels, ejector pin holes, and alignment features. It remains fixed during the casting cycle while the moving die half opens and closes against it.
Working Principle
The Fixed Die Half provides a stable, stationary mold surface against which the Moving Die Half closes to form the mold cavity. Molten metal is injected through the sprue in the fixed half into the cavity. After solidification, the moving half retracts, while the fixed half remains in place, allowing the casting to be ejected from the moving half. Its rigidity ensures dimensional accuracy and consistent alignment during high-pressure injection cycles.
Materials
Typically made from premium tool steels such as H13 (AISI), DIN 1.2344, or similar hot-work steel grades. Heat treated to 44-48 HRC for durability. Alternative materials include maraging steels for high-volume production or copper alloys for improved thermal conductivity in specific applications.
Technical Parameters
  • Alignment Precision guide pins/bushings (e.g., 40-60 mm diameter)
  • Thickness 200-600 mm (varies with die size)
  • Surface Finish 0.4-1.6 μm Ra on cavity surfaces
  • Weight Capacity Designed for machine clamping force (e.g., 250-4000 tons)
  • Cooling Channels Diameter 8-12 mm, conformal or drilled
  • Mounting Pattern Standardized per machine platen (e.g., JIS, DIN, or custom)
Standards
ISO 12165, DIN 16760, NADCA #207-2003

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Fixed Die Half (Cover Die).

fixed die half cover die stationary die die casting die mold base tool steel H13 die casting component injection molding tooling Fixed Die Half (Cover Die) Fixed Die Half (Cover Die) in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Die Casting Die

A precision tool used in high-pressure die casting to shape molten metal into complex components.

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Engineering Analysis

Risks & Mitigation
  • Thermal fatigue cracking
  • Wear on guide surfaces
  • Cavity erosion from molten metal
  • Misalignment due to platen deflection
  • Cooling channel blockage
FMEA Triads
Trigger: Cyclic thermal stress from molten metal injection
Failure: Heat checking or thermal fatigue cracks on cavity surface
Mitigation: Use H13 steel with proper heat treatment, implement conformal cooling, and apply surface treatments (e.g., nitriding).
Trigger: Improper alignment or worn guide pins/bushings
Failure: Flash formation, part dimensional inaccuracies, or die damage
Mitigation: Regular inspection and replacement of alignment components, use of hardened steel guides, and proper lubrication.
Trigger: Inadequate cooling or channel blockage
Failure: Extended cycle times, incomplete solidification, or warped castings
Mitigation: Design optimized cooling layouts, use filtered coolant, and perform routine maintenance.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.05 mm on critical dimensions, flatness within 0.02 mm per 100 mm
Test Method
CMM inspection, hardness testing (Rockwell C), dye penetrant testing for cracks, pressure testing of cooling channels

Buyer Feedback

★★★★☆ 4.5 / 5.0 (14 reviews)

"The technical documentation for this Fixed Die Half (Cover Die) is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Machinery and Equipment Manufacturing environments. No issues with the Fixed Die Half (Cover Die) so far."

"Testing the Fixed Die Half (Cover Die) now; the technical reliability results are within 1% of the laboratory datasheet."

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Frequently Asked Questions

What is the difference between Fixed Die Half and Moving Die Half?

The Fixed Die Half is mounted to the stationary platen and remains in place during operation, containing the sprue and often the cavity. The Moving Die Half is mounted to the moving platen, opens/closes, and typically contains the ejector system to remove castings.

Why is H13 steel commonly used for Fixed Die Half?

H13 tool steel offers excellent hot hardness, thermal fatigue resistance, and toughness at elevated temperatures, making it ideal for withstanding repeated thermal cycling and high-pressure injection in die casting.

How is alignment maintained between die halves?

Precision guide pins and bushings are installed in the Fixed Die Half to ensure accurate, repeatable alignment with the Moving Die Half, preventing flash and ensuring part dimensional consistency.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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