Slant Bed Lathe

Product Overview

The heavy-duty CNC slant bed lathe is engineered for high-efficiency, high-precision mass production of complex rotational components. Built with a 30 to 45 degree integral inclined Meehanite cast iron bed, the machine provides superior structural rigidity, effective vibration dampening under heavy chip loads, and unobstructed gravity chip evacuation directly into a lower chip conveyor. Designed for continuous multi-shift operations, it accommodates rigid turning, boring, grooving, and threading operations across ferrous and non-ferrous alloys.

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Product Range

Compact Series (e.g., SBL-200): Designed for small-to-medium parts (automotive fittings, small hydraulic valves); max turning diameter 350 mm, max machining length 500 mm.
Mid-Size Standard Series (e.g., SBL-300): Balanced platform for general industrial job shops; max turning diameter 450 mm, max machining length 750 mm.
Heavy-Duty / Big-Bore Series (e.g., SBL-400/500): Engineered for oilfield pipes, large shafts, and heavy machinery components; max turning diameter up to 600 mm+, spindle bore options up to 86 mm / 105 mm.

Technical Specifications

Parameter	Standard Model (SBL-300)	Heavy-Duty Model (SBL-400)
Max. Swing Over Bed	520 mm	650 mm
Max. Machining Diameter	420 mm	560 mm
Max. Machining Length	750 mm	1,250 mm
Spindle Bore	62 mm (Optional 82 mm)	86 mm (Optional 105 mm)
Spindle Nose	A2-6	A2-8
Max. Spindle Speed	4,000 RPM	3,000 RPM
Spindle Motor Power (Cont./Peak)	11 kW / 15 kW	15 kW / 18.5 kW
X/Z Axis Travel	220 mm / 800 mm	280 mm / 1,300 mm
X/Z Axis Rapid Traverse	24 m/min / 30 m/min	20 m/min / 24 m/min
Positioning Accuracy (ISO 230-2)	X: 0.008 mm / Z: 0.010 mm	X: 0.010 mm / Z: 0.012 mm
Repeatability Accuracy	X: +/-0.003 mm / Z: +/-0.004 mm	X: +/-0.004 mm / Z: +/-0.005 mm
Turret Capacity	12-Station Servo Turret	12-Station Hydraulic Turret
Machine Weight	Approx. 4,500 kg	Approx. 6,800 kg

Key Features

Rigid Slant Bed Structure:

Finite Element Analysis (FEA)-optimized 45 degree inclined bed casting minimizes thermal deformation and transfers cutting forces directly to the floor base.

High-Precision Cartridge Spindle:

Supported by high-precision P4-grade angular contact ball bearings, dynamically balanced to eliminate thermal growth distortion at speeds up to 4,000 RPM.

Direct-Coupled Ball Screws:

C3-grade precision ground ball screws coupled directly to AC servo motors via zero-backlash couplings, ensuring high axial rigidity and positioning accuracy.

Fast Indexing Servo Turret:

Bi-directional 12-station turret delivers tool change times of 0.2 seconds adjacent station, reducing non-cutting cycle times.

Centralized Lubrication System:

Programmable automatic lubrication system delivers metered oil to guide ways and ball screws at timed intervals, preventing premature wear.

Materials & Surface Finishes

Bed Casting: HT300 Meehanite cast iron, stress-relieved via thermal annealing and vibratory aging to eliminate internal residual stress.

Guideways: Linear roller guideways (P-class) on X and Z axes, induction-hardened and precision-ground box ways available for heavy intermittent cutting configurations.

Spindle Material: 40Cr alloy steel, carburized and quenched to HRC 58-62 for wear resistance on bearing journals.

Compatible Workpiece Materials: Carbon steels (AISI 1045, 4140), stainless steels (304, 316L, 17-4PH), alloy steels, aluminum alloys (6061, 7075), brass, and titanium.

Achievable Surface Finish: Ra 0.4 to Ra 0.8 micrometers under stable finishing parameters.

Applications

01.

Automotive:

Transmission shafts, steering knuckles, CV joint components, and brake hubs.

02.

Oil & Gas:

Valve bodies, drill collars, couplings, and threaded pipe fittings conforming to API standards.

03.

Fluid Power:

Hydraulic cylinder rods, spool valves, and pump housings.

04.

General Engineering:

Precision pins, bushings, rollers, and industrial pulleys requiring tight concentricity.

Quality Control & Inspection

01/

Cast Iron Analysis: Metallographic testing performed on every casting batch to verify graphite flake distribution and tensile strength compliance (Min. 300 MPa).

02/

Laser Interferometer Calibration: Positioning and repeatability accuracy tested and mapped on X and Z axes using Renishaw laser interferometers prior to shipment.

03/

Ballbar Testing: Circular diagnostic testing executed to verify contouring accuracy, servo matching, and geometric squareness.

04/

72-Hour Burn-In Test: Spindle and axes run continuously under thermal load test cycles for 72 hours to screen out early-failure components.

05/

Video: Renishaw Laser Interferometer Calibration & Axis Ballbar Testing in Progress available upon request

06/

Inspection Report: Every machine ships with a verified ISO 230-2 test report and coordinate measuring machine (CMM) alignment data sheet.

Custom Manufacturing Process

Technical Requirement Review:

Engineering review of customer component drawings, material specifications, tolerance limits, and cycle time targets.

Fixture & Tooling Engineering:

Custom hydraulic chuck design, soft jaw machining, and boring bar/turning tool selection based on component geometry.

Machine Assembly & Integration:

Mechanical assembly in temperature-controlled facilities, hydraulic/pneumatic plumbing, and CNC controller wiring (Fanuc / Siemens / Mitsubishi) complying with CE safety directives / electrical standards.

Sample Test Cutting (Try-Out):

Trial machining runs using customer raw material to verify dimensional accuracy, surface finish, and tool life.

Pre-Shipment Inspection (PSI):

Final customer sign-off via live video inspection or third-party audit (SGS/TUV) before crating and container loading.

Technical Support & After-Sales Service

Installation & Commissioning:

On-site or remote engineering support for machine leveling, anchoring, electrical grid connection, and geometric alignment.

Remote Diagnostics:

Ethernet-enabled CNC controllers allow remote error logging and parameter troubleshooting by field service engineers.

Operator & Maintenance Training:

Comprehensive programming (G-code / conversational) and routine maintenance training modules provided for operator teams.

Spare Parts Inventory:

Critical replacement items, including spindle cartridges, servo drives, ball screws, and hydraulic valves, stocked in regional warehouses for dispatch within 24 hours.

FAQ

Q: What is the main structural advantage of a slant bed lathe over a flat bed lathe?

A: A slant bed design provides a 30 to 45 degree inclined casting structure, which significantly improves chip evacuation via gravity, preventing chip accumulation on the guide ways. It also shortens the distance from the tool turret to the guide way, reducing tool overhang and enhancing structural rigidity under heavy radial cutting forces.

Q: What CNC controller options and electrical standards are available for export markets?

A: Standard configurations support Fanuc 0i-TF Plus, Siemens SINUMERIK 828D, and Mitsubishi M80 controllers. All electrical cabinets utilize high-grade components complying with CE safety requirements (and optional UL-compliant wiring configurations for North American market specifications upon request).

Q: How do you prevent thermal growth distortion of the spindle during high-speed, multi-shift production?

A: Spindles are supported by precision-matched angular contact bearings and lubricated with high-grade synthetic grease or oil-air lubrication. For high-duty cycle applications, an external spindle oil chiller system is available as an option to maintain constant operating temperatures.

Request a Quote

To receive a detailed commercial quotation including freight estimates, lead times, and specific tooling packages, please provide the following details to our engineering sales team:
Component engineering drawing or 3D model (STEP/IGES format)
Material grade and initial blank condition (bar stock, forging, casting)
Target annual production volume and required cycle time
Preferred CNC controller brand (Fanuc / Siemens / Mitsubishi)
Delivery destination port or facility address

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