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CNC Underfloor Wheel Lathe

CNC underfloor wheel lathe is a large-scale CNC lathe designed specifically for machining large wheels (such as train wheels, automobile hubs, and construction machinery wheels). It is an intelligent upgrade of underfloor lathes, utilizing a CNC system to achieve automated, high-precision machining.

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Description

cnc under floor wheel lathe

basic Definition

A CNC underfloor wheel lathe processes large wheel workpieces. It utilizes a underfloor structure (the workpiece is placed directly on a floor guide rail or work surface, eliminating the need for a headstock to support the long axis as in traditional lathes). Incorporating computer numerical control (CNC) technology, it enables automated machining of key wheel components, including the outer diameter, inner bore, end face, rim, and web, ensuring high precision and efficiency.

Core Functions

CNC Underfloor Wheel Lathe 2

CNC underfloor wheel lathe is primarily used for turning and repairing wheelsets in rail transit vehicles, eliminating the need to disassemble the wheelsets from the bogie as a whole. The equipment uses a dedicated positioning device to fix the entire vehicle or bogie, directly machining the wheel tread and flange. It can quickly repair various types of damage to wheels, such as wear, scratches, peeling, and tread dents, correct wheel diameter differences and flange thickness, and restore the standard wheel dimensions. This significantly reduces the need for wheelset disassembly, assembly, and lifting, shortening maintenance time, reducing labor intensity, and minimizing additional damage to bearings and suspension components during disassembly and assembly. It is widely used in daily wheelset maintenance in subway, EMU, and conventional locomotive depots.

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cnc underfloor wheel lathe

Parameters

Item	Parameter
Applicable Rolling Stock	EMUs, metro trains, passenger & freight locomotives
Wheelset Wheelbase Range	1800–2600 mm
Wheel Diameter Machining Range	760–1250 mm
Max. Allowable Flange Height	38 mm
Compatible Tread Profiles	LM, LMA, XP55 and other standard profiles
Control System	CNC system with automatic profile scanning
Cutting Feed Rate	0.05–0.5 mm/rev
Spindle Drive Power	≥45 kW
Wheel Diameter Loss per Turning	≤1.2 mm
Machining Mode	In-situ machining – wheelset & bogey remain installed
Repeat Positioning Accuracy	≤0.02 mm
Total Machine Weight	Approx. 68 t
Power Supply	AC 380 V / 50 Hz, total installed capacity ≈ 85 kVA

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Key Features

Large-Scale Structure:

The machine bed offers a strong rigidity and high load capacity, capable of machining large wheels with diameters of several meters and weights of several tons, meeting the wheel dimensions required for heavy vehicles and rail vehicles.

The underfloor layout reduces workpiece clamping space constraints, making it suitable for stable machining of extremely large and heavy workpieces.

CNC Control:

Equipped with a high-precision CNC system, it supports automatic programming and parametric machining, reducing manual errors.

It enables multi-axis linkage (such as X- and Z-axis linkage) to precisely machine complex contours (such as rim curves and web profiles).

Specialized Design:

Specific fixtures (such as three- and four-jaw chucks and centers) are designed to meet the structural characteristics of wheels, ensuring secure workpiece clamping and high coaxiality.

The tooling system is compatible with wheel materials (such as cast and forged steel) and supports integrated roughing, semi-finishing, and finishing, ensuring surface finish and dimensional accuracy.

Efficiency and Stability:

A high degree of automation reduces manual intervention and labor intensity, while also improving batch processing consistency.

Key components such as the machine bed and guide rails are constructed from high-strength cast iron or welded structures, and undergo aging treatment to eliminate internal stresses, ensuring long-term stability and precision retention.

Applications

Rail Transit: Machining train, subway, and tram wheels, serving as a core piece of equipment for rail vehicle wheelset manufacturing.

Automotive: Used for machining large wheel hubs for heavy trucks and buses, as well as for manufacturing wheels for specialized vehicles (such as engineering vehicles and armored vehicles).

Construction Machinery: Machining drive and guide wheels for large construction machinery such as loaders, cranes, and road rollers.

Mining and Metallurgy: Provide precision processing for heavy-duty wheels of mining vehicles and metallurgical equipment to meet the requirements of high loads and harsh working conditions.