Skew Rolling Mill
Skew rolling with helical-groove rolls; round steel is formed into balls in a single pass.
Efficiency is over 10 times higher than traditional forging.
Suitable for the full-range production of steel balls with diameters from φ20mm to φ125mm.
Product Introduction
The skew rolling mill is a core piece of equipment newly launched by Shenyang Muren Machinery Co., Ltd., primarily used for producing grinding balls, bearing ball blanks, and other metal spherical components. The equipment utilizes a helical-groove skew rolling process; heated round steel billets are rolled into balls in a single pass between a pair of cross-arranged rolls, enabling continuous, automated production.
Technical Specifications
|
Parameter |
Specification |
|
Ball Diameter Range |
20mm – 125mm (customizable) |
|
Raw Material |
65Mn, 60Mn, B2, B3, 40Cr and other alloy steels |
|
Heating Method |
Induction heating |
|
Rolling Temperature |
890～1050℃ |
|
Production Efficiency |
40 – 120 pieces/min (depends on diameter) |
|
Control System |
PLC automatic control |
|
Material Utilization Rate |
≥95% |
|
Roll Material |
High-hardness alloy |
|
Warranty |
12 months |
Product Structure
Main Unit
Includes the base, upright columns, upper crossbeam, and roll assembly. The frame features a composite structure of cast steel components and welded crossbeams, offering high rigidity to withstand the heavy loads encountered during rolling.
Roll Assembly
Mounted on a rotatable drum. The roll feed angle is adjusted via the drum mechanism to meet the rolling requirements for different steel ball specifications. The rolls are also equipped with an axial adjustment mechanism to ensure rolling precision.
Guide Plate System
Upper and lower guide plates are installed between the two rolls to guide the billet into the roll gap and control the exit direction of the rolled product. The upper guide plate is manually adjusted using a helical screw-down mechanism, while the lower guide plate's height is adjusted using shims.
Drive System
Composed of a main motor, a combined gearbox, universal drive shafts, and a balancing device. Power is distributed through the gearbox to two universal drive shafts, which independently drive the two rolls. Gear-type couplings connect the universal drive shafts to the roll ends, allowing for the adjustment of the roll phase angle. · Feeding Mechanism: Includes a receiving platform and a pneumatic pusher; it pushes the heated billet through a guide sleeve into the roll gap, where the billet is immediately gripped by the rolls for the rolling process.
Product Advantages
High Efficiency
Multiple steel balls are produced simultaneously with each rotation of the rolls; production efficiency is over 10 times higher than traditional forging.
Superior Quality
Steel balls feature precise dimensions and excellent sphericity; the hardness difference between the core and surface is less than 5 HRC, and the breakage rate is below 1%.
High Automation
Continuous operation throughout the entire process-from heating and rolling to quenching and tempering-eliminates the need for manual intervention and minimizes the impact of human factors on quality.
Stable Operation
The roll box features a rigid, integrated design and includes functions for precise feeding and automatic rapid roll retraction; this protects the rolls from damage during a jam and allows for quick guide plate replacement.
FAQ
Q: What is a skew rolling mill primarily used for?
A: Skew rolling mill are used to produce grinding steel balls, bearing ball blanks, and other spherical metal components. Utilizing a helical-groove skew rolling process, they roll heated round steel billets into balls in a single pass, making them ideal for continuous mass production.
Q: What are the advantages compared to traditional forging or casting?
A: Skew rolling is a chipless plastic forming process that offers high material utilization. The rolled steel balls feature a dense internal microstructure and precise dimensions; with a core-to-surface hardness difference of less than 5 HRC and a breakage rate below 1%, they offer a longer service life.
Q: What is the level of automation?
A: The entire production line enables fully automated, continuous operation-from heating and rolling to quenching and tempering-without the need for manual intervention, thereby reducing the impact of human factors on quality. It also features an automatic rapid roll retraction function to protect the rolls from damage in the event of a jam.
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