Ningbo Fenghua Bolong Machinery Manufacturing Co., Ltd. is one of the leading manufacturers and suppliers of cold extrusion in China. Please feel free to buy durable cold extrusion made in China here from our factory. All customized products are with high quality and competitive price.
Forming Capabilities
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Process Variants |
Material Types |
Component Types |
Key Features |
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Forward extrusion, backward extrusion, combined extrusion |
Aluminum Alloy: 6000 series (6061, 6063, 6082) Pure Aluminum: 1060, 1100, 3003 |
Lightweight structural components, housings, piston bodies |
Complex internal geometries, thin walls, excellent surface finish |
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Copper Alloys: Pure copper / oxygen-free copper (T1, T2, TU1, TU2), Brass (H62, H65) |
Electrical connectors, valve bodies, bushings |
High conductivity, tight radii, burr-free surfaces |
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Low Carbon Steel: 10#, 20# Medium Carbon Quenched & Tempered Steel: 45# Alloy Structural Steel: 20Cr, 40Cr |
Spline shafts, gear blanks, stepped pins, valve bodies |
Reduced cross-sections, deep cavities, spline profiles; material flow lines follow final contour |
Process Specifications
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Parameter |
Value |
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Equipment |
High-capacity cold extrusion presses |
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Material Diameter Range |
Φ3mm – Φ150mm |
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Forming Height Range |
5mm – 200mm |
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Dimensional Accuracy |
±0.05mm (IT7–IT8 grade) |
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Surface Finish |
Ra0.2 – Ra0.6 achievable |
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Secondary Operations |
CNC turning, threading, spline rolling, heat treatment |
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Certifications |
IATF 16949 (Quality Management), ISO 14001 (Environmental), ISO 45001 (Occupational Health & Safety), IECQ QC080000 (Hazardous Substance Process Management) |
Performance Highlights
Complex geometries, one operation – Cold extrusion produces deep blind holes, stepped shafts, spline profiles, and thin-wall cup shapes in a single press stroke. The material flows along the die contour - no chips, no material removal, no interrupted grain flow. This delivers mechanical properties that machined parts cannot match.
Material utilization >80% – Scrap is limited to cut-off losses and minor flash. In typical applications, material utilization reaches 80% or higher. A benchmark example: piston pins achieve 92% material yield through cold extrusion, compared to just 43.3% with conventional machining.
Replace machining with extrusion - stronger parts from lower-grade materials – The compressive stress state during cold extrusion produces denser microstructures and continuous grain flow, actually yielding higher strength than machined parts. A proven case: piston pins originally machined from 20Cr steel switched to 20# steel via cold extrusion - and exceeded the original performance specifications while using a lower-grade, lower-cost material.
Work-hardened surface, as-formed – The high-pressure deformation induces strain hardening at critical surfaces and load-bearing areas. Components emerge with improved surface hardness and wear resistance - often eliminating the need for additional heat treatment for base strength.
Spline and gear profiles, precision-formed – Dimensional accuracy reaches IT7–IT8 grade with surface finish down to Ra0.2–Ra0.6. Cold extruded spline shafts and gears achieve consistent geometry and excellent surface finish across production batches. The process is faster, more consistent, and more material-efficient than milling or hobbing.
Multi-material capability – We cold extrude aluminum alloys, copper alloys, and steels - giving customers a single supplier for diverse material requirements across automotive, electronics, and industrial applications.
Automotive-grade quality system – IATF 16949-certified facility with full PPAP Level 3 documentation - process FMEA, control plans, capability studies - prepared to the same standard we apply to Tier 1 automotive customers.
Quality Control
Applications
Cold Extruded Spline Shafts and Gears
Automotive transmission spline shafts, gear blanks, and steering components are cold extruded to near-net shape with consistent geometry and excellent tooth surface finish. Dimensional accuracy reaches IT7–IT8 grade. The cold extrusion process eliminates the variation typical of hobbing or broaching.
Aluminum Structural Components and Housings
Lightweight aluminum components - motor housings, valve bodies, and structural parts - are cold extruded to complex internal geometries with thin walls and excellent surface finish (Ra0.2–Ra0.6). The process is particularly cost-effective for medium-to-high volume runs where lightweighting and precision are equally critical.
Steel Valve Bodies and Pump Components
Automotive and industrial valve bodies, pump housings, and joint components are formed from alloy steels through cold extrusion, achieving high strength and dimensional accuracy (±0.05mm) while minimizing post-processing. The work-hardened surfaces improve wear resistance in high-pressure fluid and mechanical applications.
Copper Electrical Connectors and Bushings
High-conductivity copper components - battery connectors, terminal blocks, and electrical bushings - are cold extruded with tight radii and burr-free surfaces, ready for direct assembly or secondary plating operations.
Beyond Automotive
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Sector |
Typical Components |
Key Requirements |
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Transmission / Drivetrain |
Spline shafts, gear blanks, synchronizer components |
Spline accuracy, strength, high-volume consistency |
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Hydraulics / Pneumatics |
Valve bodies, pump housings, piston components |
Pressure resistance, surface finish, dimensional accuracy |
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Aerospace |
Structural fittings, actuator components |
High strength-to-weight ratio, precision, traceability |
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Electrical / Electronics |
Connector housings, terminal blocks, heat sinks |
Conductivity, tight tolerances, surface quality |
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Industrial Equipment |
Bearing sleeves, bushing bodies, wear sleeves |
Wear resistance, concentricity, cost-effective volume |
Why Cold Extrusion
Machining is subtractive. Cold heading is upsetting. Cold extrusion is controlled material flow. The distinction matters when your parts have complex internal geometries or spline profiles:
Machining – removes material to create features. The grain flow is cut, not formed. Good for low volumes. Bad for strength and material cost at scale.
Cold heading – upsets material to create heads and flanges. Limited to cylindrical and stepped profiles. Cannot produce deep cavities or spline forms.
Cold extrusion – displaces material in a controlled flow, following the die contour. The grain flow is continuous, following the final geometry - meaning the part is stronger in every direction. Deep cavities, splines, and complex cross-sections are formed in one stroke. No chips. Minimal waste. Cycle times measured in seconds.
For spline shafts, valve bodies, structural housings, and precision connectors, cold extrusion is not a cost-saving alternative. It is the production method.
Contact Us for Your New Project
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