Z28-250 thread rolling machine
Z28-250 thread rolling machine
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1.Introduction for Z28-250 thread rolling machine:
The Z28-250 is a two-die cylindrical thread rolling machine designed for cold-forming precision external threads, high-strength standard fasteners, T-shaped screws, anchor bolts, and workpieces requiring larger thread pitches. It is widely used in hardware construction, automotive and motorcycle parts manufacturing, traffic power equipment, and standard parts production.
The machine utilizes cold rolling (non-chip) forming technology, which extrudes the material using rolling dies rather than cutting it. This process creates continuous metal fibers and generates radial compressive stress, significantly improving the workpiece's fatigue strength, torsional strength, and wear resistance. It is an ideal process for high efficiency, energy saving, and low consumption.
2.Technical parameter for Z28-250 thread rolling machine
3.Characters for Z28-250 thread rolling machine:
3.1 High Efficiency and Energy Saving: Utilizing the cold rolling process, no chips are produced, resulting in high material utilization rate and low energy consumption.
3.2 Enhancing Component Performance: The radial compressive stress and cold work hardening effect generated during the processing process significantly enhance the fatigue strength, torsional strength and wear resistance of the component.
3.3 High Precision and Consistency: The thread profile is full and plump, the diameter consistency is good, and the surface roughness can reach Ry 0.1–0.8 μm, with a precision level of GB197-63 Grade 2.
3.4 Wide Applicability: Capable of processing workpieces with diameters ranging from Φ4.2 to Φ120 mm (depending on the model); the pitch range is typically 0.3–8.0 mm; suitable for materials such as carbon steel, alloy steel, and non-ferrous metals (elongation > 10%, tensile strength < 1000 N/mm²)
3.5 Multi-mode Operation: Supports three working modes: manual, semi-automatic, and automatic. Some models are equipped with PLC control, human-machine interface, automatic feeding, and other functions.
3.6 Strong structural rigidity: Mostly uses cast steel bodies or high-strength welded structures to ensure processing stability
3.7 Environmental Safety: No open flames, no cutting fluid contamination (using water-soluble coolant), in compliance with national construction industry safety standards
4.Application for Z28-250 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.