INDUSTRY COMPONENT

Crankshaft

A crankshaft is a mechanical component that converts reciprocating linear piston motion into rotational motion in precision mechanical stamping presses.

Component Specifications

Definition
The crankshaft is a critical rotating shaft in precision mechanical stamping presses that transforms the reciprocating motion of connecting rods (driven by pistons or eccentric mechanisms) into smooth, continuous rotational motion. It features precisely machined crankpins and main journals that operate within high-precision bearings, maintaining strict alignment and balance to ensure consistent stamping force delivery with minimal vibration.
Working Principle
The crankshaft operates on the principle of converting linear reciprocating motion into rotational torque through offset crankpins. As the press's drive mechanism (often via a flywheel and clutch) rotates the crankshaft, the eccentric crankpins cause the connecting rods to move in a controlled reciprocating pattern, which drives the press ram up and down with precise timing and force application for metal stamping operations.
Materials
Typically forged alloy steel (e.g., AISI 4140, 4340, or EN19) with surface hardening treatments like induction hardening or nitriding on bearing surfaces. High-precision applications may use vacuum-remelted steels for enhanced fatigue resistance.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Maximum RPM100-600 RPM
Stroke Length50-400 mm
Balancing GradeG2.5 or better per ISO 1940
Surface Hardness55-62 HRC on journals
Crankpin Diameter70-180 mm
Torsional StiffnessMinimum 10^6 Nm/rad
Main Journal Diameter80-200 mm

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 1940-1, DIN 3760, ISO 286-2, DIN 7190

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Fatigue failure from cyclic loading
  • Bearing seizure due to lubrication failure
  • Torsional vibration resonance
  • Misalignment causing premature wear
FMEA Triads
Trigger: Insufficient lubrication
Failure: Bearing seizure and crankshaft scoring
Mitigation: Implement automated lubrication monitoring with pressure/temperature sensors and scheduled oil analysis
Trigger: Improper balancing
Failure: Excessive vibration leading to bearing damage and press frame fatigue
Mitigation: Dynamic balancing to ISO 1940 standards during manufacturing and after any repairs

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Journal diameters: IT6-IT7, Eccentricity: ±0.02 mm, Surface finish: Ra 0.4-0.8 μm
Test Method
Ultrasonic testing for internal defects, magnetic particle inspection for surface cracks, coordinate measuring machine (CMM) verification of geometries

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
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Crankshaft

Manufacturer profiles associated with Crankshaft.

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Related Components

Upper Tool (Punch)
Upper Tool (Punch) is the active forming component in metal plate bending machines that applies precise downward force to create bends in sheet metal.
Main Frame
The main frame is the primary structural component of a hydraulic press, providing rigidity and stability to withstand high compressive forces during metal forming operations.
Shaft Bearing
Precision component supporting rotating shafts in vibration motors to reduce friction and maintain alignment.
Seal Groove
Precision-machined groove in aluminum bearing housings designed to accommodate sealing elements for fluid containment and contamination prevention.

Frequently Asked Questions

What maintenance is required for stamping press crankshafts?

Regular lubrication system checks, vibration monitoring, bearing clearance inspections every 6-12 months, and torsional vibration analysis during preventive maintenance.

How does crankshaft design affect stamping precision?

Precision-ground journals and proper balancing reduce vibration, ensuring consistent ram motion and part quality. Eccentricity tolerance directly impacts stroke consistency.

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.

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