Ball Mill Cylinder
Ball Mill Cylinder
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
  • Ball Mill Cylinder

I. Introduction to the Ball Mill Cylinder

The ball mill cylinder is its core load-bearing component, fabricated by rolling and welding high-strength steel plates. It is lined internally with wear-resistant liners, which withstand the impact and abrasion caused by the steel balls and materials during rotation—making it a critical structure for achieving material crushing.

Core function: Containing the grinding media (steel balls/steel segments) and the material to be ground, withstanding rotational torque (ranging from thousands to tens of thousands of newton-meters) and impact loads, while transmitting motor power to complete the grinding process.

II. Material Selection (Wear-Resistant)

Component

Recommended Materials

Standard

Performance Requirements

Cylinder shell steel plate

Q345R/Q355GJC

GB/T 713 / GB 1591

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

Flange End Cap

ZG270-500/ZG20SiMn

GB/T 11352

Cast steel parts, UTS ≥ 500 MPa

Lining plate

High-manganese steel ZGMn13Cr2

GB/T 5680

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

Bolt

35CrMoA/42CrMo

GB/T 3077

High strength (UTS ≥ 980 MPa)

III. Welding Methods

Weld Type

Craftsmanship

Parameter Example

Cylinder longitudinal seam

Submerged Arc Welding (SAW)

Welding wire H10Mn2, current 650–750A

Cylinder Shell Circumferential Seam

Twin SAW Welding

Double wire spacing is 30 mm, with a speed of 40 cm/min.

Flange-to-cylinder weld joint

Flux-Cored Arc Welding (FCAW)

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

Key Processes in Welding Technology

Pre-weld preparation: Material cutting, forming, and beveling (with precision control).

Strict cleaning: Remove oil, rust, water, oxide scale, and other contaminants from the bevel and surrounding areas on both sides.

Assembly tack welding: Use the same welding materials and processes as for the final welds to ensure high-quality tack welds of appropriate length and spacing. Also, inspect assembly gaps and misalignment.

Preheating (if required): Heat evenly to the specified temperature, and monitor and record accordingly.

Welding process:

Weld strictly according to the WPS and welding sequence.

Control interlayer temperature (monitor and record).

When performing multi-pass, multi-layer welding, carefully clean away interlayer slag and spatter. Ensure proper fusion of each weld pass to prevent defects.

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

IV. Critical Process Control

Bevel Design: Cylindrical Shell Longitudinal Seam: X-Type Bevel (60° Angle, 6mm Root Face)

Cylinder shell circumferential weld: K-groove (outer bevel angle 55°, inner bevel angle 45°)

Deformation prevention measures: After rolling, spot-weld reinforcing rings (to maintain roundness deviation within ≤0.1% of diameter)

Ring seam welding uses a roller stand combined with an anti-creep device, with a rotation speed of 0.5 to 1.5 r/min.

Post-weld treatment: Vibration Stress Relief (VSR): Residual Stress Reduction (as an alternative to thermal stress relief)

Localized Annealing: Stress Relief Treatment at 600°C in the Flange Weld Zone

Welding Process

Application Scenarios

Material preparation process

Flame cutting (CNC cutting), plasma cutting, laser cutting, shearing, and sawing. High-precision bevel machining (such as edge milling and bevel cutting machines).

Forming process adopted

Rolling (cylindrical and conical shapes), bending (using a bending machine), pressure forming (with large-scale presses), and roll forming.

Assembly and Alignment

Using large-scale tooling fixtures and platforms—such as welding positioners and roller stands—ensures the precise positioning and dimensions of each component. This is a critical step in quality control.

Common Welding Methods

Application Scenarios

Submerged Arc Welding

Suitable for long straight welds and circumferential seams (such as longitudinal and circumferential seams of cylindrical shells).

Gas-shielded welding

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

Shielded Metal Arc Welding

Suitable for positions that are difficult to automate, short welds, and repair welding. It is less efficient and relies heavily on the welder's skill.

Electroslag Welding

Vertical welding for extra-thick plates (such as box girder diaphragms).

Narrow-Gap Welding

Designed for butt joints of ultra-thick plates, it offers high efficiency with minimal deformation.

Post-weld treatment

 

Stress

Large components generally require post-weld heat treatment—either overall or localized (typically stress relief annealing)—to remove weld slag and spatter, followed by grinding of the weld seam and its surrounding areas. This process helps relieve residual welding stresses, preventing deformation, cracking, and improving the material's toughness.

Orthopedic

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

Mechanical Processing

Perform precision machining operations such as milling, boring, and drilling on critical mating surfaces and hole locations.

We will conduct non-destructive testing, inspection, and testing on the products:

Project Content
Visual Inspection

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

Ultrasonic Testing (UT)

Detecting internal defects (such as lack of fusion, incomplete penetration, slag inclusions, cracks, etc.) is especially critical for thick plates.

Radiographic Testing (RT)

Intuitively displays internal defects and is commonly used for critical butt joints.

Magnetic Particle Testing (MT)

Detection of Surface and Near-Surface Defects (Ferromagnetic Materials)

Penetrant Testing (PT)

Detecting surface opening defects (non-magnetic materials).

Destructive Testing (Sampling)

Such as tensile testing, bending tests, impact tests, hardness tests, and metallography (typically conducted during process qualification or random inspections).

Dimensional Inspection

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

Pressure/Leak Test (if required)

Such as hydraulic tests, pneumatic tests, and air-tightness tests.

V. Specification Range

1. Reference to the self-weight of the cylinder

Specifications (Diameter × Length)

Cylinder wall thickness

Self-weight range

Reference overall machine weight

Φ2.2 × 7m

22~26mm

10-12t

45–55 tons

Φ3.6 × 6m

36~40mm

22–30 tons

110–130 tons

Φ4.5 × 12m

46~50mm

66–70 tons

280–320 tons

Φ5.5 × 8.5m

58~60mm

70–80 tons

450–500 tons

2. Weight Composition Ratio

Component

Proportion

Explanation

Cylinder shell steel plate

85% to 90%

Dominant weight (density 7.85 t/m³)

Flange End Cap

8% to 12%

Cast steel parts (density 7.8 t/m³)

Lining Plate Bolt

2%~3%

High-strength bolt array (over 1,000 bolts per unit)

Keywords

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Ball Mill Cylinder
Ball Mill Cylinder
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
  • Ball Mill Cylinder

Ball Mill Cylinder

The mill cylinder is the core load-bearing component, fabricated by rolling and welding high-strength steel plates. It is lined internally with wear-resistant liners, which withstand the impact and abrasion caused by steel balls and materials during rotation—making it a critical structure for achieving material crushing. Commonly used materials for the cylinder include Q345R/Q355GJC steel plates as per GB/T 713/GB 1591, while flange end covers are made from ZG270-500/ZG20SiMn or GB/T 11352, all designed to offer excellent wear resistance and impact strength, making them ideal for large-scale ball mill equipment.

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