Upper Mold Plate: Thickness 50-200 mm, Flatness ≤0.02 mm/m

Component Specifications

Definition

The Upper Mold Plate is a critical structural component in injection mold assemblies, typically mounted to the moving platen of the injection molding machine. It contains the upper half of the mold cavity, cooling channels, and ejection system components. This plate provides precise alignment with the lower mold plate, withstands high clamping forces during injection, and ensures dimensional accuracy of molded parts through controlled thermal expansion and mechanical stability.

Working Principle

The Upper Mold Plate operates by moving vertically with the machine's moving platen during the molding cycle. It closes against the stationary lower mold plate to form a sealed cavity, withstands injection pressure to prevent flash formation, and opens after cooling to allow part ejection. Precision guide pins ensure accurate alignment with the lower plate, while integrated cooling channels regulate temperature for optimal material flow and solidification.

Materials

Typically manufactured from pre-hardened tool steels (P20, H13, S7) or stainless steels (420, 440C) with hardness 28-32 HRC for standard applications, or hardened tool steels (D2, A2) at 52-56 HRC for high-wear applications. Surface treatments may include nitriding, chrome plating, or PVD coatings for enhanced wear resistance and corrosion protection.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Flatness	≤0.02 mm/m
Hardness	28-56 HRC
Thickness	50-200 mm
Parallelism	≤0.01 mm
Surface Finish	Ra 0.4-0.8 μm
Thermal Conductivity	15-40 W/m·K

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

Standards

ISO 8015, DIN 16749, ISO 20457

Parent Products

This component is used in the following industrial products

Mold Assembly

The complete mold assembly used in ceramic tile pressing machines to form tiles under high pressure.

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Engineering Analysis

Risks & Mitigation

Wear and tear from cyclic loading
Thermal stress cracking
Misalignment causing flash formation
Corrosion in cooling channels
Fatigue failure from high-pressure cycles

FMEA Triads

Trigger: Insufficient hardness or improper material selection
Failure: Premature wear and dimensional inaccuracy
Mitigation: Use appropriate tool steel grades with hardness testing and implement regular inspection schedules

Trigger: Thermal cycling without proper stress relief
Failure: Cracking and distortion
Mitigation: Implement controlled heating/cooling cycles and use materials with matched thermal expansion coefficients

Trigger: Improper alignment during installation
Failure: Flash formation and part rejection
Mitigation: Use precision guide systems and implement alignment verification procedures

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.01 mm for critical dimensions, ±0.05 mm for non-critical features

Test Method

CMM measurement per ISO 10360, surface roughness testing per ISO 4287, hardness testing per ISO 6508

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Upper Mold Plate

Manufacturer profiles associated with Upper Mold Plate.

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Frequently Asked Questions

What is the difference between Upper Mold Plate and Lower Mold Plate?

The Upper Mold Plate is mounted to the moving platen and contains ejection systems, while the Lower Mold Plate is stationary and typically contains the sprue and runner systems. Both plates form complementary halves of the mold cavity.

How often should Upper Mold Plates be maintained?

Regular inspection every 50,000 cycles for wear, alignment, and surface integrity. Preventive maintenance includes cleaning cooling channels, checking guide pin wear, and verifying flatness specifications.

Can Upper Mold Plates be repaired if damaged?

Minor surface damage can be repaired through welding and re-machining, but significant structural damage typically requires plate replacement to maintain dimensional accuracy and safety.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Upper Mold Plate