Z28-500 thread rolling machine
Z28-500 thread rolling machine
Full-range Machinery & Customized Non-standard Solutions
Authorized Certificates & Independent R&D Patents
Over 10 Years Global Export & Worldwide Project Cases
Navigation
1.Introduction for Z28-500 thread rolling machine:
The Thread Rolling Machine is primarily designed for rolling various types of precision external threads, high-strength standard fasteners, anchor bolts, T-shaped screws, and other workpieces requiring larger screw pitches.
The Automatic Thread Rolling Machine utilizes radial cold roll forming—an advanced non-chip (chipless) machining process. The rolling tool extrudes the material, creating continuous metal fibers without cutting. The compressive pressure generated during rolling effectively improves surface roughness, hardness, and strength of the workpiece. Compared to thread cutting, rolling increases production efficiency by several times (even dozens of times), saves material, and facilitates automated processing.
Screw thread rolling machines use rolling dies as the forming tool. The dies are specially hardened and durable, suitable for workpiece materials with hardness not exceeding HRC37 (optimum HRC25 or below). The material should have an elongation greater than 10% and tensile strength less than 100 Kgf/mm². Applicable materials include various carbon steels, alloy steels, and non-ferrous metals. It should be noted that rolling tool life decreases significantly as material hardness increases.
2.Technical parameter for Z28-500 thread rolling machine
3.Characters for Z28-500 thread rolling machine:
3.1 High Efficiency & Energy Saving
The cold rolling process produces no chips, achieving high material utilization and low energy consumption compared to traditional cutting methods.
3.2 Enhanced Component Performance
Radial compressive stress and cold work hardening generated during rolling significantly improve fatigue strength, torsional strength, and wear resistance of the finished workpiece.
3.3 High Precision & Consistency
Thread profiles are full and uniform with excellent diameter consistency. Surface roughness can reach Ry 0.1–0.8 μm, with precision meeting GB197-63 Grade 2 standards.
3.4 Wide Applicability
Diameter range: Φ4.2 – Φ120 mm (model dependent)
Pitch range: 0.3 – 8.0 mm
Suitable materials: carbon steel, alloy steel, non-ferrous metals (elongation > 10%, tensile strength < 1000 N/mm²)
3.5 Multi-Mode Operation
Supports three operating modes: manual, semi-automatic, and automatic. Advanced models feature PLC control, HMI touch interface, and automatic feeding systems.
3.6 High Structural Rigidity
Constructed with cast steel bodies or high-strength welded frames, ensuring stable processing and long-term accuracy.
3.7 Environmental Safety
No open flames, no cutting fluid contamination (uses water-soluble coolant), and complies with national construction industry safety standards.
4.Application for Z28-500 thread rolling machine:
products faq
Thread rolling is a cold forming process that displaces material to form threads without removing any metal. This results in stronger threads with superior surface finish. Thread cutting is a subtractive process that removes material using a cutting tool, producing weaker threads due to interrupted grain flow and leaving cutting marks. Rolling also offers higher production speeds and no material waste.
The machine can produce a wide variety of thread profiles, including:
Standard threads – metric (M), UNC, UNF, BSW, BSF
Tapered threads – NPT, BSPT, API (oil and gas)
Special profiles – knurls, splines, worms, lead screws
Custom profiles – tailored to specific application requirements
The specific profile depends on the die set used.
The machine processes a broad range of ductile materials, including:
Carbon steel and alloy steel
Stainless steel (300 and 400 series)
Aluminum and aluminum alloys
Brass, copper, and titanium
High-strength materials (e.g., Grade 12.9 bolts)
Harder or more brittle materials may not be suitable for rolling due to limited deformation capacity.
Infeed (Plunge-Feed) – Dies close radially onto the workpiece with no axial movement. The process is fast and suitable for threads up to moderate length. Ideal for large diameter threads and high-volume production.
Throughfeed – The workpiece feeds axially between rotating dies, allowing for unlimited thread length. Best for long threaded rods, studs, and continuous production runs.
Routine maintenance includes:
Inspecting rolling dies for wear or damage; rotating or replacing as needed
Lubricating bearings, guideways, and moving parts regularly
Checking hydraulic fluid levels and seals (on hydraulic models)
Verifying electrical connections and control system calibration
Cleaning the machine to remove chips, coolant residue, and debris
Performing regular alignment checks to ensure consistent thread quality
We provide detailed maintenance schedules, spare parts support, and technical assistance to keep your machine in optimal condition.