CNC vertical lathe processes brake drums

CNC vertical lathes for brake drums are designed for high-efficiency mass production of brake drum-type workpieces. They enable one-time clamping to complete machining of internal bores, outer diameters, friction surfaces, and mounting flanges.

They are also suitable for machining similar heavy-duty disc components, such as rail transit wheel discs and construction machinery end caps. The machines meet the production requirements of customers across four major industries: commercial vehicle parts, wind power equipment, heavy construction machinery, and high-pressure valve manufacturing.

CNC vertical lathes are used for machining brake drums made of gray cast iron and ductile iron, as well as brake hubs and heavy-duty flanges. They are widely applied in the manufacturing of commercial vehicle brake components, mining machinery parts, wind power equipment, and large pipeline valves.

Performance Advantages

The X-axis travel of 580 mm covers the outer diameter and radial machining range of a Φ1000 brake drum, eliminating the need for secondary clamping or repositioning when machining the outer friction surface. The Z-axis travel of 800 mm meets the requirements for boring the inner hole and machining the inner end face of extended heavy-duty brake drums with depths of up to 800 mm, enabling one-time machining of deep-cavity brake drums.

The standard model is equipped with a 24-inch three-jaw hydraulic chuck with adjustable clamping force to accommodate brake drums of varying wall thicknesses. Thin-walled brake drums are not subject to clamping marks or deformation during machining, while thick-walled heavy-duty drums are securely clamped to prevent workpiece displacement or scrap during cutting. The machine supports brake drum blanks for mainstream light trucks, heavy trucks, and trailers, allowing flexible switching between different drum types without changing equipment. The bottom annular end face of the brake drum ensures even force distribution, reducing deformation in thin-walled workpieces.

The CNC vertical lathe is equipped with a 22 kW high-power spindle delivering a rated torque output of 375 N·m, effectively preventing load-induced speed fluctuation or stalling. The spindle speed range is 100–800 rpm. Low speeds are used for rough machining of brake drum blanks to remove surface scale, while medium to high speeds are used for finishing the friction surface, balancing cutting force and surface finish quality.

The large-diameter ball screw in the X-axis is designed to withstand high radial cutting forces, providing strong resistance to deformation during outer diameter machining of brake drums.

The reinforced Z-axis ball screw supports both the workpiece weight and axial cutting loads, ensuring stable, chatter-free deep-hole boring of the brake drum inner bore.

■ To meet the diverse brake drum machining requirements of different customers, the machine supports a wide range of customization options:

Chuck upgrade: The machine can be equipped with 15-inch, 18-inch, 20-inch, or medium-sized chucks for machining light passenger vehicle brake drums, or upgraded to a 32-inch large chuck for machining heavy-duty mining vehicle brake drums.

Spindle power upgrade: A higher-power spindle motor is available for heavy-duty cutting applications, suitable for high material removal rough machining.

Turret configuration: A six-station or eight-station vertical turret can be selected to support complex multi-process brake drum machining.

Travel customization: X/Z-axis travel can be adjusted to accommodate non-standard brake drums with varying heights and diameters.

Automation options: Chip conveyors, advanced cooling systems, tool post high-pressure coolant, and custom fixtures can be added.

Multi-Level Precision Testing Process Before Shipment

The guideways undergo precision manual scraping to ensure optimal contact surface fit and more uniform wear during long-term reciprocating feed motion. The spindle bearings and lead screws are fully assembled in a temperature-controlled, dust-free workshop to eliminate assembly stress.

Before each CNC vertical lathe leaves the factory, it undergoes a 72-hour no-load run-in test and a load test using a brake drum workpiece. At the same time, four key performance indicators-positioning accuracy, repeatability, spindle runout, and turret indexing accuracy-are strictly inspected. Only machines that meet all standards are released for shipment and delivered with a complete precision inspection report for customer acceptance.

Customer usage site

Certificate Display

All CNC vertical lathe models are certified with CE marking for EU safety compliance and ISO9001 quality management system certification. Each machine can be supplied with factory inspection reports, certificates of origin, customs clearance documents, and third-party SGS accuracy verification reports upon request, fully meeting import inspection requirements in the EU, North America, Southeast Asia, and Russian-speaking regions, and helping to avoid customs clearance issues for customers.

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