Overview
The thread rolling machine with rolling dies is a specialized industrial equipment designed for mass production of high-strength external threads. Unlike thread cutting, which removes material, this machine displaces metal to form threads through pressure, resulting in superior fatigue resistance and surface finish. The cold forming process enhances the mechanical properties of threads by work-hardening the material. These machines are widely adopted in fastener manufacturing, automotive, and aerospace industries where thread integrity and production speed are critical.
Structure and Working Principle
A typical machine consists of a rigid frame, hydraulic or mechanical power system, and precision-matched rolling dies. The dies contain the negative impression of the desired thread profile and rotate to press the pattern onto the workpiece. During operation, the cylindrical workpiece is fed between the dies under high pressure (commonly 50–200 kN). The material flows plastically to fill the die cavities, creating a continuous thread with tight tolerances (typically ISO 6g–4h). Modern variants may include CNC controls for adjustable pitch and diameter settings.
Key Features
1. **Material Efficiency**: No chip generation reduces material waste by 15–20% compared to cutting. 2. **Enhanced Strength**: Cold-formed threads exhibit 20–30% higher fatigue resistance due to grain flow continuity. 3. **Speed**: Capable of producing 60–400 threads per minute depending on size. Advanced models feature automatic feeding systems, in-process gauging, and predictive maintenance alerts. Die life ranges from 50,000 to 1 million cycles when properly maintained, with carbide dies lasting 3–5 times longer than HSS in abrasive materials.
Application Areas
Primary applications include: - **Fastener Production**: High-volume manufacturing of grade 8.8+ bolts and screws. - **Automotive**: Axle shafts, steering components, and suspension parts. - **Oil & Gas**: Threaded pipes and downhole tools requiring leak-proof connections. The technology is unsuitable for brittle materials (e.g., cast iron) or very hard alloys (>45 HRC). For aerospace applications, machines often incorporate special alignment systems to achieve NASM or UNJ thread standards.
Maintenance and Precautions
Regular maintenance includes daily die cleaning with non-chlorinated solvents, weekly lubrication of guide rails (using ISO VG 68 oil), and monthly inspection of hydraulic systems. Die wear can be monitored through thread plug gauge checks every 500 cycles. Critical precautions: 1) Avoid overlubrication that causes workpiece slippage. 2) Ensure workpiece hardness is within 75–95% of die hardness. 3) Never roll threads on workpieces with surface defects, as these may cause die chipping. Storage should be in low-humidity environments to prevent corrosion on precision components.
B2B Procurement Guide
When sourcing these machines, evaluate: 1) **Throughput**: Machines are categorized by max workpiece diameter (commonly 6–80mm) and strokes per minute. 2) **Automation**: Semi-automatic models cost 30–50% less but require manual loading. 3) **Standards**: Look for CE or OSHA compliance for EU/US markets. Leading manufacturers include Profiroll (Germany), Rems (USA), and Torin (China). Request test runs with your specific material—carbon steels (AISI 1018–1045) are most cost-effective. Budget 15–25% extra for custom die sets for special thread forms like ACME or trapezoidal.
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