Steel Ball Skew Hot Rolling Mill Line
The Steel Ball Skew Hot Rolling Mill Line is a continuous production system for manufacturing steel grinding balls from heated round steel bars. It combines controlled heating, skew hot rolling, quenching, tempering and inspection into one coordinated production process.
Product Introduction
The Steel Ball Skew Hot Rolling Mill Line is a continuous production system for manufacturing steel grinding balls from heated round steel bars. It combines controlled heating, skew hot rolling, quenching, tempering and inspection into one coordinated production process.
Hot Rolling Process for Steel Grinding Balls
The production line integrates the complete process from steel bar heating to finished-ball inspection:
Round Steel Feeding → Heating → Skew Hot Rolling → Quenching → Tempering → Inspection
Heating: Round steel bars are heated within the required process temperature range to provide suitable forming conditions.
Skew Hot Rolling: Heated steel is continuously formed into grinding balls through controlled roll grooves.
Quenching: Hot-rolled balls are rapidly cooled to develop the required hardness and microstructure.
Tempering: Controlled tempering reduces internal stress and balances hardness and toughness.
Inspection: Finished balls are checked for size, hardness and other specified quality requirements.
Key Features of the Hot Rolling Production Line
Integrated Process: Combines heating, skew rolling, quenching and tempering in one continuous production flow.
Continuous Rolling: Enables stable, high-throughput production of steel grinding balls.
Temperature Control: Automatic control of quenching entry temperature supports consistent heat treatment.
Equipment Protection: Rapid roll retraction helps limit excessive rolling loads under abnormal conditions.
Flexible Changeover: Roll and guide adjustments allow different ball sizes to be produced on the same line.
Rapid Roll Retraction
The roll-opening mechanism quickly increases the roll gap when abnormal rolling conditions occur, such as material jamming or improper billet entry.
This helps reduce excessive load on the rolls and drive components, protecting key equipment and reducing unplanned downtime.
Steel Ball Quality and Heat Treatment Control
The hot rolling process is closely connected with the final mechanical properties of the grinding balls. By coordinating rolling and heat treatment parameters, the line can be configured for different performance requirements.
Typical reference values are:
|
Parameter |
Typical Range |
|
Steel Ball Diameter |
Ø20–125 mm |
|
Production Capacity |
0.5–25 t/h |
|
Heating Temperature |
850–1100°C |
|
Surface Hardness |
57–67 HRC |
|
Surface-Core Hardness Difference |
<5 HRC |
|
Impact Toughness |
12–35 J/cm² |
|
Breakage Rate |
Typically targeted at <1% under qualified material and controlled process conditions. |
Actual heating temperature depends on steel grade, bar diameter and process requirements.
Applicable Steel Grades
The Steel Ball Skew Hot Rolling Mill Line can be configured for different grinding ball materials, including:
65Mn
B2
B3
GCr15
Medium-carbon steels
Low-alloy steels
Other steel grades subject to process evaluation
Production Line Configuration
Depending on production requirements, the line may include:
Automatic feeding system
Round steel heating system
Skew hot rolling mill
Ball transfer and separation equipment
Quenching system
Tempering system
Inspection equipment
Electrical control and automation system
Installation and Commissioning
Installation and commissioning services may include:
Mechanical Installation: Equipment positioning, leveling and alignment.
System Testing: Electrical checks, control system testing and production line coordination.
Trial Production: Process parameter adjustment and product quality checks.
Operator Training: Equipment operation, routine maintenance and basic troubleshooting.
The installation schedule, acceptance criteria and on-site service costs are confirmed in the purchase contract. Final acceptance is based on the production and quality criteria agreed in the purchase contract.
Warranty and Technical Support
Warranty Period: 12 months, subject to contract confirmation.
Coverage: Defects in materials and workmanship under agreed operating conditions.
Exclusions: Normal wear parts, consumables and damage caused by improper operation or inadequate maintenance, as defined in the contract.
After-Sales Support: Technical consultation, troubleshooting and spare parts supply after the warranty period under separate terms.
Spare Parts and Response Time
Common Spare Parts
Rolling rolls and guide components
Bearings, seals and hydraulic components
Sensors, relays and selected electrical parts
Proposed Service Targets
Technical Response: Within 1 business day.
Spare Parts Quotation: Within 2 business days after specifications are confirmed.
In-Stock Parts Dispatch: Target 3–5 business days after order confirmation, subject to availability.
Engineering Considerations
Line configuration is determined by steel ball diameter, steel grade, required output and heat-treatment requirements.
These factors affect the rolling mill size, heating capacity, quenching system and overall line arrangement.
FAQ
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