CNC machine tools are high-precision, high-efficiency, and highly automated machine tools. The spindle is the core component of a CNC machine tool, responsible for rotating the workpiece and performing cutting operations, determining the machining speed, cutting force, and machining efficiency. Therefore, when using CNC machine tools, it is necessary to select a suitable spindle structure and model, and to perform regular maintenance to ensure the spindle's normal operation and lifespan. At the same time, it is also important to avoid over-processing and overloading to prevent equipment damage or a decline in workpiece machining quality.
I. Structure of CNC Machine Tool Spindle
The spindle structure of a CNC machine tool includes the spindle head, bearings, gear transmission, spindle housing, and spindle motor. The spindle head is the front end of the spindle, typically consisting of a spindle taper, clamping device, and spindle nose. Bearings are a crucial component supporting the spindle; the spindle's rotational accuracy and stability are directly related to the quality of the bearings. The gear transmission typically consists of spindle gears, drive gears, and a power source, primarily converting the motor's rotation into spindle rotation. The spindle housing is the supporting part of the spindle, composed of front and rear end covers and a central housing, ensuring the spindle's stability and rigidity. The spindle motor is the drive unit for the spindle, typically consisting of an AC or DC motor and a speed changer.
II. Working Principle of CNC Machine Tool Spindle
The working principle of a CNC machine tool spindle is that the rotation of the motor drives the spindle to rotate, thereby realizing the cutting and machining of the workpiece. When the spindle starts, the power generated by the spindle motor is transmitted to the gear transmission device, and the rotation of the gears drives the spindle to rotate. At the same time, the clamping device of the spindle head clamps the workpiece on the spindle, and the workpiece is also cut and machined as the spindle rotates.
III. How to Select a Suitable CNC Machine Tool Spindle
With numerous brands and models of CNC machine tool spindles on the market, how do we choose the right one?
1. It has high cutting rigidity at low speeds and can suppress high-speed vibration at high speeds, maintaining cutting accuracy at different speeds.
2. It has high acceleration and deceleration capabilities, reaching the spindle operating speed in the shortest time, with a response time close to 0.
3. The spindle has high sensitivity, no noise, low vibration, and no backlash.
4. Enables rapid maintenance, reducing losses caused by downtime.
IV. How to Select a SycoTec CNC Machine Tool Spindle
SycoTec CNC machine tool spindles come in multiple models, each with different speeds, power, torque, dimensions, and weights. The appropriate spindle model must be selected based on the specific machining requirements.
1. Machine tool spindle uses 4080 DC ceramic bearings, operates at 40,000 rpm, has a maximum torque of 5 Nm, a maximum power of 15,000 W, a taper runout ≤1 μm, simultaneous internal and external cooling from 6 nozzles, automatic tool change, and automatic taper cleaning.
2. The machine tool spindle uses a 40100 DC ceramic bearing, operates at 40,000 rpm, has a maximum torque of 8 Nm, a maximum power of 16,755 W, a taper runout of ≤1 μm, simultaneous internal and external cooling from 6 nozzles, automatic tool change, and automatic taper cleaning.
3. The machine tool spindle 5062DC has a housing clamping dimension of 61.91mm, a maximum power of 6KW, a maximum speed of 35000 rpm, a maximum torque of 3.5Nm, a taper runout of ≤1μm, uses an HSK-C32 tool holder, features manual tool changing, a cylinder-free design, and is lightweight, weighing approximately 3kg.
V. How to maintain and care for CNC machine tool spindles
Besides the inherent quality of the electric spindle, the lifespan of the spindle also depends heavily on its daily maintenance. Spindles typically operate in less than ideal environments, especially in machining workshops with excessive dust or high temperatures, which can shorten their lifespan. Therefore, regular maintenance of the spindle is crucial.
1. Please connect the inverter power supply according to the voltage input required by the actual inverter being used; and the power supply connected to the inverter must be filtered and stabilized to ensure that the voltage connected to the inverter does not fluctuate.
2. The spindle must not be subjected to any impact from any direction or in any form. If the spindle is impacted, its dynamic balance will be disrupted, and it may even lead to bearing damage, affecting the service life of the spindle.
3. After each spindle is vented, a sealing state is achieved. Please refer to the parameters on the spindle housing label for the sealing air flow rate (the sealing air pressure must be strictly controlled). Excessive air pressure will damage the bearing grease or lubrication system, causing the bearings to lose lubrication and potentially fail at high spindle speeds; insufficient air pressure will not achieve the desired sealing effect. For the tool change air pressure at the rear of the spindle, please refer to the parameters on the spindle housing label. When the tool change air pressure exceeds the parameters on the spindle housing label, gas will be blown out through the intermediate tie rod from the contact surface of the front rotor cone and the chuck, as well as the chuck gap, cleaning the cone surface. This is especially important for the ceramic ferrule grinding process, requiring regular cleaning of the cone surface. It is recommended to use a pressure valve (with a pressure gauge) to regulate the air pressure. The pressure regulating valve must be installed near the spindle sealing air inlet to ensure the sealing air pressure entering the spindle is within the specified range. Furthermore, both the tool change air and the sealing air entering the spindle must be filtered to achieve dryness and dust-free conditions (see below for specific filtration levels).
4. Please use the provided professional tools to disassemble and assemble the chuck.
5. Tool selection, spindle speed and other related parameter settings must be determined based on the on-site cutting conditions.
6. Please use the drive cable provided by our company for the spindle. Do not manufacture cables that do not meet the requirements.
7. It is recommended to use a water cooling system for the spindle to dissipate heat and cool it down; at the same time, the operation of the water cooling system should be checked regularly. If any abnormality is found, please stop using the spindle immediately and troubleshoot and repair it before using it again.
8. Please note that the tapered surface of the chuck used must be kept clean and free of scratches; otherwise, it will change the accuracy of the tapered surface at the front end of the spindle rotor, resulting in the inability to lock the tool and causing tool drop or breakage.
VI. Regarding Sukerd Speed
Kasite, the Asia-Pacific service center of SycoTec, Germany, provides high-speed spindle & robot solutions for industrial robots (metal and composite material processing), PCB depaneling (aluminum and copper substrate cutting), CNC machine tool retrofitting (improving processing efficiency), dental prosthesis processing (zirconia, titanium alloy, CAD/CAM), advertising industry (non-metallic materials, flexible materials processing), ceramic ferrules (internal and external grinding), and micro-hole processing.
