INDUSTRY COMPONENT

Ejector Plate

A precision plate in injection molding machines that pushes finished plastic parts out of the mold cavity.

Component Specifications

Definition
The ejector plate is a critical component within the ejection mechanism of injection molding machines, designed to apply uniform force through ejector pins to dislodge solidified plastic parts from the mold after the cooling cycle. It operates within the mold base assembly, typically driven by hydraulic or mechanical systems, and must maintain strict alignment and flatness to prevent damage to the mold or part defects.
Working Principle
The ejector plate moves forward when activated by the machine's ejection system, transferring force to ejector pins that contact the molded part. This linear motion pushes the part out of the mold cavity, after which the plate retracts to its original position for the next cycle.
Materials
Typically made from hardened tool steel (e.g., AISI 4140, D2) or pre-hardened steel (e.g., P20) for durability and wear resistance. Surface treatments like nitriding may be applied to enhance hardness.
Technical Parameters
  • Thickness 20-100 mm
  • Surface Hardness 45-55 HRC
  • Flatness Tolerance ≤0.02 mm/m
  • Mounting Hole Pattern Standardized to mold base dimensions
Standards
ISO 16916, DIN 16760

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Ejector Plate.

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Plate warping under thermal stress
  • Misalignment causing part damage
  • Wear leading to ejection failures
FMEA Triads
Trigger: Thermal expansion from molding cycles
Failure: Plate warping or binding
Mitigation: Use materials with low thermal expansion and ensure proper cooling.
Trigger: Inadequate lubrication
Failure: Increased friction and premature wear
Mitigation: Implement scheduled lubrication with high-temperature greases.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Flatness within 0.02 mm per meter, hole positions ±0.05 mm
Test Method
Coordinate measuring machine (CMM) inspection, surface plate checks

Buyer Feedback

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Frequently Asked Questions

What causes ejector plate wear?

Wear results from friction, misalignment, inadequate lubrication, or using incompatible materials, leading to reduced precision and part defects.

How to maintain an ejector plate?

Regularly inspect for flatness and wear, ensure proper lubrication, check alignment with ejector pins, and clean to prevent debris buildup.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Ejector Pins Elastic Element