Process – Cosmic Springs & Engineers Limited

High-Performance Hot Coiled Springs for Freight & Bogie Applications

Designed and manufactured to meet the mechanical, dimensional and fatigue requirements of India’s freight and bogie platforms.

A disciplined, end-to-end manufacturing workflow designed for precision, consistency and fatigue performance.

At CSEL, every spring is produced through a controlled, multi-stage process that combines metallurgical science, precision machinery and rigorous inspection protocols. Our workflow is aligned with the technical expectations of railway standards, ensuring each spring delivers stable suspension characteristics and long operational life.

Process Flow Chart for the Manufacture of Hot Coiled Helical Springs for Wagons

Raw Material Receipt

Chemical Test

Visual & Dim. Check

Straightening

Peeling

Re-Straightening

Centreless Grinding (1st)

Centreless Grinding (2nd)

Mag. Crack Detect (Bars)

Shearing / Cutting

End Tapering & Stamping

Coiling

Quenching

Tempering

Scragging

End Grinding

Shot Peening

Re-Scragging

Mag. Crack Detect (Springs)

Physical Test

Load Testing Axial/Lateral

Final Internal Inspection

Priming

Final Painting & Grouping

External Inspection

Packing

Dispatch

Our Technological Strengths

Engineered for precision, durability and RDSO compliance.

Advanced Coiling Systems

Hot-coiling machines designed for precision geometry and repeatability.

Controlled Heat Treatment

Heavy-duty suspension springs designed for 25-ton axle load wagons. Built for strength, dimensional accuracy and consistent load response.

Comprehensive Testing Lab

Load testing, hardness testing, dimensional inspection and crack detection performed in-house.

Process Transparency & Traceability

Every spring is stamped, recorded and tracked through a fully controlled workflow.

Explore Our Engineering Capabilities

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