Industry-Verified Manufacturing Data (2026)

Moving Die Half (Ejector Die)

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Moving Die Half (Ejector Die) used in the Machinery and Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Moving Die Half (Ejector Die) is characterized by the integration of Ejector Plate and Ejector Pins. In industrial production environments, manufacturers listed on CNFX commonly emphasize Tool steel (H13, P20) construction to support stable, high-cycle operation across diverse manufacturing scenarios.

The movable half of a die casting die that contains ejector mechanisms to remove castings

Product Specifications

Technical details and manufacturing context for Moving Die Half (Ejector Die)

Definition
In die casting dies, the moving die half (ejector die) is the component that moves during the casting cycle to open and close the die. It houses the ejector system (pins, sleeves, plates) that pushes solidified castings out of the cavity after solidification. This half typically attaches to the moving platen of the die casting machine and works in conjunction with the fixed die half to form complete mold cavities.
Working Principle
During die casting operation, the moving die half closes against the fixed die half under machine pressure to form sealed cavities. After molten metal injection and solidification, the moving half retracts, opening the die. Built-in ejector mechanisms then activate to push the casting(s) out of the cavities before the next cycle begins.
Common Materials
Tool steel (H13, P20), Maraging steel, Beryllium copper (for inserts)
Technical Parameters
  • Overall dimensions, cavity layout, ejector pin locations, and mounting features (mm) Standard Spec
Components / BOM
  • Ejector Plate
    Holds and activates ejector pins during ejection cycle
    Material: Steel
  • Ejector Pins
    Direct contact with casting to push it out of cavity
    Material: Tool steel
  • Return Pins
    Ensures ejector plate returns to starting position
    Material: Steel
  • Guide Pins/Bushings
    Aligns moving half with fixed half during closing
    Material: Tool steel
Engineering Reasoning
0.5-2.5 MPa hydraulic pressure, 20-120°C operating temperature, 0.01-0.05 mm/s movement speed
Hydraulic pressure exceeding 3.0 MPa causes seal extrusion, temperature above 150°C initiates thermal expansion mismatch exceeding 0.15 mm, movement speed beyond 0.08 mm/s induces hydraulic hammer pressure spikes to 4.2 MPa
Design Rationale: Thermal fatigue from cyclic heating (20-120°C) and cooling during casting cycles causes microcrack initiation at stress concentrators (e.g., ejector pin holes) following Coffin-Manson fatigue law with exponent n=0.33 for die steel
Risk Mitigation (FMEA)
Trigger Hydraulic fluid contamination exceeding ISO 4406 18/16/13 cleanliness level
Mode: Spool valve stiction causing ejector plate misalignment of 0.5-2.0 mm
Strategy: Install 3 μm absolute filtration with differential pressure monitoring at 0.15 MPa trigger
Trigger Uneven thermal gradient exceeding 50°C/mm across die face during solidification
Mode: Differential thermal expansion inducing warpage of 0.1-0.3 mm at ejector plate mounting surface
Strategy: Implement conformal cooling channels maintaining ±5°C temperature uniformity using 40°C heat transfer fluid

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Moving Die Half (Ejector Die).

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 150 MPa injection pressure
other spec: Ejection force capacity: 10-500 kN depending on die size
temperature: 200-400°C (typical die casting alloys)
Media Compatibility
✓ Aluminum alloys (e.g., A380, A360) ✓ Zinc alloys (e.g., ZA-8, ZA-27) ✓ Magnesium alloys (e.g., AZ91D)
Unsuitable: High-lead content alloys (causes soldering and die erosion)
Sizing Data Required
  • Projected casting area (cm²)
  • Required ejection stroke length (mm)
  • Number and diameter of ejector pins needed

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Misalignment wear
Cause: Improper installation, thermal expansion mismatches, or guide pin/bushing degradation leading to uneven contact and accelerated surface wear
Fatigue cracking
Cause: Cyclic thermal and mechanical stresses from repeated injection/ejection cycles, especially with high-pressure molding or rapid cycling
Maintenance Indicators
  • Visible flashing or burrs on molded parts indicating die half separation during injection
  • Audible knocking or scraping during die movement, suggesting misalignment or worn components
Engineering Tips
  • Implement precision alignment verification during installation using dial indicators and laser alignment tools to ensure parallel movement
  • Establish controlled thermal management with consistent pre-heating/cooling cycles to minimize thermal shock and expansion stresses

Compliance & Manufacturing Standards

Reference Standards
ISO 9001:2015 Quality Management Systems ANSI B94.5.1M-1985 (R2020) Cutting Tools - Milling Cutters DIN 16742:2013 Plastics Moulding Tools - Injection Moulds and Compression Moulds
Manufacturing Precision
  • Flatness: 0.05mm per 100mm
  • Bore diameter: H7 tolerance (+0.025mm to +0.000mm)
Quality Inspection
  • Dimensional Verification with CMM (Coordinate Measuring Machine)
  • Surface Hardness Testing (Rockwell C scale)

Factories Producing Moving Die Half (Ejector Die)

Verified manufacturers with capability to produce this product in China

✓ 95% Supplier Capability Match Found

S Sourcing Manager from Brazil Jan 20, 2026
★★★★★
"Great transparency on the Moving Die Half (Ejector Die) components. Essential for our Machinery and Equipment Manufacturing supply chain."
Technical Specifications Verified
P Procurement Specialist from Canada Jan 17, 2026
★★★★☆
"The Moving Die Half (Ejector Die) we sourced perfectly fits our Machinery and Equipment Manufacturing production line requirements. (Delivery took slightly longer than expected, but technical support was excellent.)"
Technical Specifications Verified
T Technical Director from United States Jan 14, 2026
★★★★★
"Found 50+ suppliers for Moving Die Half (Ejector Die) on CNFX, but this spec remains the most cost-effective."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

18 sourcing managers are analyzing this specification now. Last inquiry for Moving Die Half (Ejector Die) from Poland (20m ago).

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Frequently Asked Questions

What materials are commonly used for Moving Die Half (Ejector Die) construction?

Common materials include tool steels like H13 and P20 for durability, maraging steel for high-strength applications, and beryllium copper for inserts requiring high thermal conductivity.

What components are included in the BOM for a Moving Die Half?

The Bill of Materials typically includes ejector plates, ejector pins, return pins, and guide pins/bushings to ensure proper alignment and ejection functionality.

How does the Moving Die Half function in die casting operations?

The Moving Die Half contains ejector mechanisms that activate after casting solidification to push the finished casting out of the die cavity, ensuring efficient production cycles.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

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