Ball mill cylinder
Ball mill cylinder
Ball mill cylinder
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  • Ball mill cylinder
  • Ball mill cylinder
  • Ball mill cylinder

1. Introduction to the Ball Mill Cylinder

The ball mill cylinder is its core load-bearing component, formed by rolling and welding high-strength steel plates, with wear-resistant liners embedded inside. It withstands the impact and abrasion from steel balls and materials during rotation, serving as the key structure for material grinding.

Core functions: to accommodate grinding media (steel balls/steel segments) and materials to be ground, bear rotational torque (thousands to tens of thousands of N·m) and impact loads, and transmit motor power to complete the grinding operation.

2. Material Selection (Wear-resistant)

Component

Recommended Material

Standard

Performance Requirements

Cylinder Steel Plate

Q345R/Q355GJC

GB/T 713 / GB 1591

Low alloy high-strength steel, impact energy at -20°C ≥ 34J

Flange End Cover

ZG270-500/ZG20SiMn

GB/T 11352

Cast steel, UTS ≥ 500MPa

Liner

High manganese steel ZGMn13Cr2

GB/T 5680

Wear-resistant and impact-resistant (HB ≤ 300)

Bolt

35CrMoA/42CrMo

GB/T 3077

High strength (UTS ≥ 980MPa)

3. Welding Methods

Weld Type

Process

Parameter Example

Cylinder Longitudinal Seam

Submerged Arc Welding (SAW)

Welding wire H10Mn2, current 650~750A

Cylinder Circumferential Seam

Twin-wire Submerged Arc Welding (Twin SAW)

Wire spacing 30mm, speed 40cm/min

Flange to Cylinder Weld

Flux-Cored Arc Welding (FCAW)

80% Ar + 20% CO₂, heat input ≤ 35kJ/cm

Key Welding Process Steps

Pre-welding preparation: material cutting, forming, groove processing (precision control).

Thorough cleaning: remove oil, rust, water, scale, etc. from groove and adjacent areas.

Assembly positioning weld: use the same welding materials and process as formal welding to ensure positioning weld quality, with appropriate length and spacing. Check assembly gaps and misalignment.

Preheating (if needed): uniformly heat to specified temperature and monitor/record.

Welding process:

Strictly follow WPS and welding sequence.

Control interpass temperature (monitor and record).

For multi-layer and multi-pass welding, carefully clean interpass slag and spatter. Ensure good weld fusion and avoid defects.

Monitor key parameters (current, voltage, speed, gas flow, etc.).

4. Key Process Controls

Groove design: Cylinder longitudinal seam: X-groove (60° angle, 6mm blunt edge)

Cylinder circumferential seam: K-groove (outer groove 55°, inner groove 45°)

Deformation prevention: tack weld reinforcement ring after plate rolling (maintain roundness deviation ≤ 0.1% diameter)

Circumferential seam welding uses roller frame + anti-slip device, rotation speed 0.5~1.5 r/min

Post-weld treatment: Vibration stress relief (VSR): residual stress relief (alternative to thermal stress relief)

Local annealing: stress relief treatment at 600°C in flange weld area

Welding Process

Application Scenarios

Cutting process used

Flame cutting (CNC cutting), plasma cutting, laser cutting, shearing, sawing. High-precision groove processing (such as milling edges, groove cutting machines)

Forming process used

Plate rolling (cylinder, cone), bending (press brake), pressure forming (large press), rolling.

Assembly and fitting

Use large tooling fixtures and platforms (such as welding positioners, roller frames) to ensure precise position and dimensions of each component. This is a key link in quality control.

Common Welding Methods

Application Scenarios

Submerged Arc Welding

Suitable for long straight seams and circumferential seams (such as cylinder longitudinal and circumferential seams).

Gas Shielded Welding

MAG (CO2 or mixed gas), MIG (inert gas). Most widely used, highly flexible (manual, semi-automatic, automatic), suitable for various positions and joint types.

Shielded Metal Arc Welding

Suitable for positions difficult to automate, short welds, and repair welding. Lower efficiency, depends on welder skill.

Electroslag Welding

Vertical welding for ultra-thick plates (such as box beam diaphragms).

Narrow gap welding

Used for butt welding of ultra-thick plates, high efficiency, low deformation.

Post-weld treatment

 

Stress

Large components generally require overall or partial post-weld heat treatment (usually stress annealing), removal of welding slag and spatter, grinding of weld seams and surrounding areas to release residual welding stress, prevent deformation and cracking, and improve toughness.

Straightening

Flame straightening, mechanical straightening (press, etc.) to control welding deformation.

Machining

Precision machining such as milling, boring, and drilling on key mating surfaces and hole positions.

We conduct nondestructive testing and inspection of products:

Item Content
Visual inspection

Surface defects (cracks, undercut appearance inspection (VT), porosity, arc pits, etc.).

Ultrasonic testing (UT)

Detect internal defects (lack of fusion, lack of penetration, slag inclusion, cracks, etc.), especially important for thick plates.

Radiographic testing (RT)

Directly displays internal defects, commonly used for important butt joints.

Magnetic particle testing (MT)

Detect surface and near-surface defects (ferromagnetic materials).

Penetrant testing (PT)

Detect surface open defects (non-ferromagnetic materials).

Destructive testing (sampling)

Such as tensile, bending, impact, hardness, metallographic tests (usually conducted during process evaluation or sampling inspection).

Dimensional inspection

Check whether the overall structural dimensions and key part dimensions meet drawing requirements.

Pressure/leakage test (if needed)

Such as hydraulic test, pneumatic test, airtightness test.

5. Specification range

1. Reference weight of cylinder body

Specification (diameter × length)

Cylinder plate thickness

Weight range

Reference machine weight

Φ2.2×7m

22~26mm

10-12t

45~55t

Φ3.6×6m

36~40mm

22~30t

110~130t

Φ4.5×12m

46~50mm

66~70t

280~320t

Φ5.5×8.5m

58~60mm

70~80t

450~500t

2. Weight composition ratio

Component

Proportion

Description

Cylinder Steel Plate

85%~90%

Dominant weight (density 7.85t/m³)

Flange End Cover

8%~12%

Cast steel parts (density 7.8t/m³)

Liner bolts

2%~3%

High-strength bolt array (over a thousand per machine)

Keywords

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Ball mill cylinder
Ball mill cylinder
Ball mill cylinder
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  • Ball mill cylinder
  • Ball mill cylinder
  • Ball mill cylinder

Ball mill cylinder

The ball mill shell is its core load-bearing component, formed by rolling and welding high-strength steel plates, with wear-resistant liners inside. It withstands the impact and abrasion from steel balls and materials during rotation, serving as the key structure for material grinding. Common materials for the shell steel plates include Q345R/Q355GJC, GB/T 713/GB 1591. Flange end covers use ZG270-500/ZG20SiMn, GB/T 11352, etc., which are wear-resistant and impact-resistant, applied in large ball mill equipment.

Contact Information

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Phone: +86-18695999359

Email: sales@zszxjx.com

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