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Home Thread Rolling Machine BIG Large Thread Rolling Machine ZR 90°feeding Thread Length 75mm Moving Die Stationary Length 90/105/25

BIG Large Thread Rolling Machine ZR 90°feeding Thread Length 75mm Moving Die Stationary Length 90/105/25

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The large thread rolling machine with ZR 90° feeding is a high-precision, heavy-duty cold-forming system engineered to produce external threads on cylindrical workpieces through a plastic deformation process. Unlike traditional machining methods that cut or grind material away, this machine utilizes hardened roller dies to cold-form threads, enhancing both the mechanical strength and surface integrity of the finished part.

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Product Description

Specification

ITEM	MODE	DIAMETER	SCREW LENGTH (mm)	THREAD LENGTH(mm)	MOVING DIES STATIONARY LENGTH	MAIN MOTOR(HP)	MAX.OUTPUT (PCS/MIN.)	APPROX.WT(KG)	MACHINE SIZE(mm)
1	ZR15L	2.5-5	50-75	75	76/89/25	3	100-160	1200	1750x1600x1850
2	ZR15H	3-5	50-75	75	90/105/25	5	130-220	1800	1900x1530x2050
3	ZR20H	5-8	75-200	100	108/127/25+127/140/25	7.5/10	110-160	2000	2000x1600x1700
4	ZR25N	6-9	100-200	100	127/140/25	7.5	100-150	3300	2800x1600x1700
5	ZR30N	6-10	100-300	100	150/165/25	15	50-120	3900	2900x1600x1800
6	ZR40N	8-12	100-200	100	190/215/35	20	60-90	6700	3000x1700x2100
7	ZR60N	10-16	150-300	100	230/265/38	30	50-60	7600	3400x1700x2100
8	ZR70N	14-20	200-300	150	290/330/50	40	40-50	13000	4000x2200x2400
9	ZR80N	16-24	200-300	150	380/420/50	60	35-45	18500	4900x2400x2700
10	ZR90N	20-30	200-350	150	450/500/60	75	25-35	26000	5200x2400x3000
11	ZR98N	24-38	250-400	150	550/600/60	100	20-35	48000	7000x2800x3200

Key Technical Features

✅ ZR 90° Cross Feeding Mechanism

The "ZR" designation refers to a cross-feeding system, where two roller dies are mounted perpendicular to the axis of the workpiece.
One die is movable, and the other remains stationary during operation.
This configuration ensures even pressure distribution, precise thread geometry, and uniform surface finish.

✅ Cold Forming Process

Threads are formed via plastic deformation, not cutting — preserving material grain structure.
Results in:

Increased fatigue resistance
Higher tensile and yield strength
Improved corrosion resistance due to smoother surfaces

✅ High Production Efficiency

Designed for mass production environments
Fast cycle times
Minimal tool wear
Low energy consumption compared to machining processes

✅ Adjustable Die Configurations

Equipped with interchangeable roller dies
Allows for flexibility in producing various thread sizes, pitches, and profiles (e.g., ISO metric, ACME, Buttress, Trapezoidal)
Die lengths may vary (e.g., 25 mm, 90 mm, 105 mm) depending on application requirements

✅ Thread Length Capability: Up to 75 mm

Enables long-length thread rolling on extended shafts and large fasteners
Suitable for applications like steering racks and long spline shafts

Working Principle

1. Clamping

The cylindrical blank (unthreaded workpiece) is securely held between centers or precision chucks.
Proper alignment is critical to ensure uniform thread formation and dimensional accuracy.
Clamping force is adjustable to accommodate different workpiece diameters and materials.

2. Rotation

Once clamped, the workpiece begins to rotate at a controlled speed, typically synchronized with the movement of the dies.
Rotation ensures even pressure distribution during the rolling process and helps achieve consistent thread geometry.

3. Feeding (ZR 90° Cross Feeding)

The movable roller die advances horizontally (at a 90° angle to the workpiece axis) toward the rotating blank.
This "ZR" feeding style allows for precise engagement of the dies with the workpiece.
Feed rate and pressure are carefully regulated to match material properties and thread specifications.

4. Rolling (Cold Forming Process)

As the moving die presses against the rotating blank, both dies apply high pressure to plastically deform the material, forming the external thread.
No material is removed — the metal is simply displaced into the desired thread profile.
Cold working enhances:

Surface hardness
Fatigue resistance
Tensile strength
Corrosion resistance due to improved surface finish

5. ✅ Release & Ejection

Once the thread has been fully formed, the pressure is released and the movable die retracts.
The finished part is automatically or manually ejected from the machine.
The cycle can then repeat, allowing for high-volume production with minimal downtime.