Ejection Mechanism for Die Casting Machines

Product Specifications

Technical details and manufacturing context for Ejection Mechanism

Definition

The ejection mechanism is a critical component of a high-pressure die casting machine responsible for safely and efficiently removing the solidified metal casting from the die cavity once the injection and solidification phases are complete. It ensures the casting is released without damage and prepares the die for the next cycle. This mechanism typically consists of ejector pins, plates, or sleeves that are actuated by hydraulic or pneumatic cylinders. The ejection force, stroke length, and speed are key parameters that must be matched to the specific casting geometry and material to avoid deformation or cracking. The number and diameter of ejector pins are selected based on the casting size and complexity, with standard diameters often following ISO 6751 for interchangeability. Operating pressure, typically in the range of 1.0–1.6 MPa, must be sufficient to overcome shrinkage and friction, and the operating temperature range of 20–300°C requires heat-resistant materials such as H13 tool steel (ASTM A681). Positioning accuracy of ±0.05 mm ensures consistent ejection and alignment, while cycle times of 5–30 seconds affect production rate. The mechanism's weight, ranging from 50–500 kg, depends on the size and number of pins. Proper maintenance and regular inspection are essential to prevent wear and failure, as the mechanism operates under high stress and temperature. When selecting an ejection mechanism, engineers must verify model-specific values and standards with the legal manufacturer or supplier, as the listed ranges are reference values that must be confirmed for the actual application.

Working Principle

After the molten metal solidifies in the die, the ejection mechanism is activated, typically via hydraulic or pneumatic cylinders. Ejector pins, plates, or sleeves extend from the moving half of the die to apply force evenly across the casting, pushing it out of the cavity. The mechanism then retracts to allow the die to close for the next shot. The ejection force must overcome casting shrinkage and friction, while the stroke length must exceed the casting depth for full ejection. Ejection speed is controlled to avoid damaging the casting, and the number of pins is determined by the casting geometry. The mechanism operates within a specified temperature range and requires precise positioning to ensure consistent ejection.

Common Materials

Tool steel, Alloy steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Ejection Force	50–500 kN	Required to overcome casting shrinkage and friction
Stroke Length	25–200 mm	Must exceed casting depth for full ejection
Ejection Speed	0.1–0.5 m/s	Higher speeds risk damaging casting
Number of Ejector Pins	4–24 pcs	Depends on casting geometry and size
Ejector Pin Diameter	6–25 mm	Standard sizes for interchangeabilityISO 6751
Operating Temperature	20–300 °C	Die casting temperatures require heat-resistant materials
Positioning Accuracy	±0.05 mm	Ensures consistent ejection and alignment
Cycle Time	5–30 s	Affects production rate
Material Grade	H13	Hot-work tool steel for high-temperature strengthASTM A681
Weight	50–500 kg	Depends on size and number of pins

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Ejector Plate Part
Holds and aligns the ejector pins, transferring force from the actuator.

Material: Alloy steel
Ejector Pins Part
Directly contact and push against the casting to eject it from the die.

Material: Tool steel
Return Pins Part
Ensure the ejector plate retracts fully when the mechanism resets.

Material: Alloy steel
Hydraulic/Pneumatic Cylinder
Provides the actuation force to drive the ejection stroke.

Material: Steel
Ejector Sleeves Optional
Push on a boss or hole rim instead of a flat face, on castings that need it.

Manufacturers of Ejection Mechanism

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Frequently Asked Questions

What is the function of an ejection mechanism in die casting?

It removes the solidified casting from the die cavity after the injection and solidification phases, ensuring the casting is released without damage and preparing the die for the next cycle.

What are the key parameters to consider when selecting an ejection mechanism?

Key parameters include ejection force, stroke length, ejection speed, number of ejector pins, pin diameter, operating pressure, operating temperature, positioning accuracy, cycle time, material grade, and weight. These must be matched to the specific casting requirements.

What standards are relevant for ejector pins?

Ejector pin diameters often follow ISO 6751 for interchangeability. Operating pressure may reference, and material grade H13 is specified under ASTM A681. Always verify compliance with the manufacturer.

How does the ejection mechanism affect production rate?

The cycle time, which includes ejection, directly influences production rate. Faster ejection speeds can reduce cycle time but may risk damaging the casting, so a balance is needed.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 150 bar (ejection force resistance)
other spec:	Cycle time: 5-30 seconds, Stroke length: 50-500 mm, Actuation speed: 0.1-1.0 m/s
temperature:	Ambient to 250°C (die temperature during operation)

Ejection Mechanism

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Reliability & Engineering Risk Analysis

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