Application Technology of the Shenyang Machine Tool T5.2-500Q CNC Lathe in Motor Shaft Machining
The motor shaft is the core transmission component of an electric motor, and its coaxiality, roundness, and surface roughness directly determine the motor’s operational stability, noise level, and service life. Shenyang Machine Tool T5.2-500Q Horizontal CNC lathes, with their high rigidity, high precision, and high efficiency, are perfectly suited for the entire machining sequence of motor shafts—from rough turning to finish turning—and are particularly well suited to 40Cr、20CrMnTi Medium-batch precision production of alloy steel materials.
I. T5.2-500Q Core Advantages (Adapted for Motor Shaft Machining)
T5.2-500Q Specifically designed for shaft-type parts, with key features precisely tailored to meet the machining requirements of motor shafts:
1. High-rigidity structure
Large-Span Double-Row Roller Spindle Bearing + High-rigidity bed, excellent vibration resistance, suitable for machining long shafts ( ≤500mm ) Resistant to deformation under load, ensuring coaxial alignment. ≤0.01 mm 。
2. High-precision control
C3 Preloaded Ball Screw + Error compensation technology, with dimensional accuracy reaching IT6 grade, with a surface roughness as low as Ra 0.4 μm , meeting the precision requirements for motor bearing seats and journal diameters.
3. High-efficiency processing capability
X/Z Axis rapid traverse speed 30m/min , eight-station servo turret + Modular intelligent tailstock: multiple operations—including external cylindrical turning, step turning, end-face machining, chamfering, and threading—can be completed in a single clamping, significantly boosting efficiency. 40%+ 。
4. Stable and reliable
Spindle through-hole φ65mm , Maximum Turning Length 500mm , compatible with mainstream motor shaft specifications; maximum spindle torque 176 N·m , ample power for heavy-duty cutting of alloy steel.
II. Motor Shaft Machining Process
With 40Cr Quenched and tempered motor shaft (long ≤500mm、 φ30–φ80mm ) as an example, T5.2-500Q Achieves single-setup, full-sequence machining with a clear and easy-to-follow process.
Steps 1： Blank Preparation and Clamping
- Select forged blanks (to enhance material density), and perform quenching and tempering to 220–250 HBW 。
- Use a three-jaw self-centering chuck. + The tailstock is used for clamping, with the center hole serving as the positioning datum. T5.2-500Q Intelligent tailstock automatic preloading, clamping deviation ≤0.005 mm , avoid bias.
Steps 2： Rough Machining (High-Efficiency Stock Removal)
Call the rough turning cycle program ( G71 ), using carbide cutting tools:
- Turn the outer diameter, step, and end face in sequence, leaving 0.3–0.5 mm Finish turning allowance.
- Spindle speed 1200–1800 r/min , feed 0.2–0.3 mm/rev 1. Depth of Cut 1.5–2.5 mm ，T5.2-500Q The high-torque spindle ensures stable cutting with no vibration marks.
Steps 3： Fine machining (ensuring accuracy)
Switch to the finish-turning program ( G70 ), with a focus on machining critical areas such as bearing seats and journal surfaces:
- Precision turning of the outer diameter and steps, with dimensional tolerance control. ±0.01 mm , Roundness ≤0.005 mm 。
- Adopt constant linear speed control ( G96 ), ensuring surface roughness Ra 0.8–1.6 μm , meeting the motor assembly requirements.
Steps 4： Auxiliary processing (completed in an integrated manner) )
By utilizing an eight-station servo tool turret, the following can be accomplished without changing equipment:
- Turn chamfers, arcs, and relief grooves to prevent stress concentrations.
- Machining external threads (such as lock threads on motor shafts) achieves high pitch accuracy and complete thread profiles.
Steps 5： Detection and cutting
After machining is completed, inspect using the machine’s built-in measurement function or an external measuring tool:
- Key dimensions: outer diameter, length, and step height.
- Geometric tolerances: coaxiality, roundness, and radial runout.
- Automatic material cutting upon qualification confirmation; single-part processing cycle 3–5 Minutes (depending on the axial length).
Three 、 Processing Advantages and Practical Operation Points
1. Core Processing Advantages
- Greater precision and stability: single-setup clamping eliminates multiple positioning errors, ensuring compliance with coaxiality and roundness specifications. 99%+ , reduced motor operating noise 30%。
- Higher efficiency: Process integration + High-speed rapid traverse reduces single-part machining time. 50% , one person can manage 2–3 Taiwanese equipment.
- Lower costs: reduced process transfers, labor, and scrap rates, making it well-suited for medium-batch, multi-variety motor shaft production.
- Wide applicability: Capable of machining materials such as carbon steel, stainless steel, and aluminum alloys, covering shaft-type components for applications in new-energy vehicles, industrial motors, and other fields.
2. Practical Operation Precautions
- Clean the center hole and the workpiece surface before clamping to ensure reliable positioning.
- Processing length-to-diameter ratio >10 When machining slender shafts, use a steady rest. / Use a tool holder to prevent vibration and deformation.
- Processing 40Cr When machining hard materials, select coated carbide cutting tools and sharpen them promptly. / Replace it to prevent tool breakage from compromising surface quality.
- Perform regular maintenance on the tool post, guideways, and tailstock to ensure equipment accuracy and stability.
Four 、 Application Summary
Shenyang Machine Tool T5.2-500Q CNC lathes are the ideal choice for the precision machining of motor shafts. Their high rigidity, high precision, and high efficiency perfectly address the challenges in motor shaft machining. “ Difficult to control accuracy, low efficiency, and cumbersome processes. ” addressing the pain points by enabling one-time workpiece clamping and end-to-end process completion, thereby ensuring product quality while significantly boosting production efficiency and reducing costs.
For motor manufacturing enterprises, T5.2-500Q It requires no complex ancillary systems and can be rapidly put into production, making it particularly well suited for the high-volume, precision machining of high-end motor shafts, such as those used in new-energy vehicle motors and industrial servo motors—making it a core piece of equipment for enhancing product competitiveness.
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