Clamping Arm / Plate: Weight Capacity 2-20 tons

Component Specifications

Definition

A clamping arm or plate is a critical structural component within mold clamping systems used in injection molding machines. It functions as the interface between the clamping mechanism and the mold halves, transmitting hydraulic or mechanical force to hold the mold securely closed during the injection and cooling phases. This component ensures precise alignment, prevents mold flash, and maintains consistent part quality by distributing clamping force evenly across the mold surface.

Working Principle

The clamping arm/plate operates by converting hydraulic pressure or mechanical force from the clamping unit into linear motion. When activated, it moves forward to contact the stationary and moving mold plates, applying controlled pressure to keep the mold closed against injection pressure. During mold opening, it retracts to allow part ejection. The system maintains precise parallelism and force distribution through guided movement along tie bars or linear guides.

Materials

Typically forged or cast steel (e.g., 4140, 4340 alloy steel) with heat treatment (hardness 28-32 HRC). High-wear surfaces may have hardened inserts or coatings (chrome plating, nitriding). Alternative materials include ductile iron for cost-sensitive applications or aluminum alloys for lightweight high-speed systems.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Stroke Length	300-1200 mm
Weight Capacity	2-20 tons
Surface Flatness	≤0.05 mm
Clamping Force Range	50-5000 kN
Mounting Hole Pattern	Standardized per machine model
Parallelism Tolerance	≤0.02 mm/m

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 12165, DIN 55189

Parent Products

This component is used in the following industrial products

Mold Box Clamping System

A mechanical system that securely holds and aligns the cope and drag mold boxes during the sand molding process.

View Product Details

Engineering Analysis

Risks & Mitigation

Fatigue cracking from cyclic loading
Wear-induced misalignment
Over-torquing of mounting bolts
Thermal expansion mismatch
Hydraulic pressure fluctuations

FMEA Triads

Trigger: Material fatigue from high-cycle operation
Failure: Crack propagation leading to catastrophic fracture
Mitigation: Implement regular non-destructive testing (ultrasonic/magnetic particle), maintain proper lubrication, avoid over-clamping beyond rated capacity

Trigger: Improper alignment during installation
Failure: Uneven force distribution causing mold flash and part defects
Mitigation: Use laser alignment tools during installation, verify parallelism after maintenance, implement standardized installation procedures

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1 mm dimensional, ±0.02° angular alignment

Test Method

Coordinate measuring machine (CMM) verification, surface plate inspection, hydraulic pressure testing with strain gauges

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 Clamping Arm / Plate

Manufacturer profiles associated with Clamping Arm / Plate.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between a clamping arm and clamping plate?

Clamping arms are typically elongated components that connect moving platens to the clamping mechanism, while clamping plates are flat interface components that directly contact mold halves. Both serve to transmit clamping force, but arms provide structural connection and plates provide surface distribution.

How often should clamping components be inspected?

Visual inspection should occur daily for wear and damage. Dimensional checks for parallelism and flatness should be performed monthly. Complete preventive maintenance including stress testing is recommended every 6-12 months depending on production cycles.

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.

Clamping Arm / Plate