INDUSTRY COMPONENT

Crankshaft

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

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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
  • Maximum RPM 100-600 RPM
  • Stroke Length 50-400 mm
  • Balancing Grade G2.5 or better per ISO 1940
  • Surface Hardness 55-62 HRC on journals
  • Crankpin Diameter 70-180 mm
  • Torsional Stiffness Minimum 10^6 Nm/rad
  • Main Journal Diameter 80-200 mm
Standards
ISO 1940-1, DIN 3760, ISO 286-2, DIN 7190

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Crankshaft.

stamping press crankshaft precision crankshaft mechanical press component forged steel crankshaft power transmission shaft industrial crankshaft Crankshaft Crankshaft in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Precision Mechanical Stamping Press

Standalone industrial press for high-speed precision metal stamping operations

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Compressor

Mechanical device that increases the pressure of refrigerant gas in a refrigeration system

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Power End

The mechanical assembly that converts rotational input power into reciprocating motion to drive the fluid end of a mud pump.

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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

Interchangeable Parts

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

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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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.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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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Crankpin/Eccentric Journal Credential Buffer