2022

Machine Tool Main Spindle Bearing with Air Cooling Spacer

By applying air cooling spacer with NTN's proprietary air-cooling technology to bearing for main spindles of machine tools, it ensures high rigidity of the main shafts, while also achieving the world's highest standard of high-speed rotational performance. There are product lineups with grease lubrication and air-oil lubrication for customers to select the most suitable bearing specifications according to the usage conditions.

Features

• Air-oil lubrication
  
  1. High-speed rotational performance:
     
     • 20% improvement compared to conventional products, dmn value* of 2.1 million
  2. High rigidity:
     
     • Sufficient bearing preload when assembling main spindles
       (up to 1300N)
  3. Noise characteristics
• Grease lubrication
  
  1. High-speed rotational performance:
     
     • Approximately 10% improvement compared to conventional product
       (dmn value of 1.6 million)
  2. High rigidity:
     
     • Approximately 10% improvement compared to conventional product

* dmn value:
an indicator that expresses the rotational performance of bearings and is bearing pitch circle diameter (mm) × rotational speed (min^-1)

Angular Contact Ball Bearing for High-Speed and Heavy-Cutting Machine Tools

This product has a high-speed rotational performance of dmn value of 1.6 million as well as 30 % improved allowable axial load capacity compared to NTN's conventional products. This enables a single machine tool to cover the rough machining work and finishing processes that previously required numerous machine tools. It also helps to further increase productivity of machining centers and complex processing units.

Features

1. High-speed rotational performance:
   
   • dmn value 1.6 million (when used with air-oil lubrication, ceramic balls)
2. High load capacity allowable axial load:
   
   • Approximately 30% improvement compared to conventional product

New Product

Multi Track Magnetic Encoder Integrated Rolling Bearing

This is a unit product integrating bearing with magnetic type encoder. By reading changes in magnetic poles of “Multi Track Magnetic Ring” attached to inner ring of bearing with magnetic sensor IC equipped with outer ring, it can detect rotational speed, direction, and absolute angle. This magnetic type encoder has industry's highest level of angle detection resolution (maximum 20bit, resolution of approximately 0.00034°), and can be used in conditions with dust and oil.

The product eliminates the need for transmission devices like couplings that connect joint shaft and rotary encoder, achieving downsizing/lightweighting of robot joint. The operation for mounting/setting up couplings is also eliminated, making assembly of robot easier. Dimensions and load capacity of the bearing in the product are the same as those of conventional bearings, and can be applied to a wide range of robots.

Features

1. Detect rotational speed, direction, and absolute angle while supporting rotating shaft of robot joints
2. Mount magnetic encoder with excellent environmental resistance
3. Contribute to downsizing and lightweighting of robot joints
4. Reduce person-hours in the process of assembly and setup of robots

Press Release

• November 4, 2022:
  NTN Develops “Multi Track Magnetic Encoder Integrated Rolling Bearing”
  https://www.ntnglobal.com/en/news/new_products/news202200067.html

“Sensor Integrated Bearing Unit” for Machine Tool Spindles

This product improved the NTN conventional product that contributes to preventing seizing of bearings for spindles by advanced condition monitoring near bearing raceway surface. It has a wireless communication function and mounting load detection sensor as new functions.

By integrating two devices ,an electro-magnetic generator that generates electricity using the rotation of spindle and a radio device, we deleted the external connection cables, and wiring space.

The load detection sensor to detect bearing loads and their trends contributes to improved machining quality and productivity, and it also enables adjustments to mount bearings in a short time. By detecting a sudden increase of preload that occurs before seizing, it also helps prevent seizing of bearings for spindles in place of the heat flow sensor used in the NTN conventional product.

Features

1. Wireless communication:
   
   • Wirelessly transmit sensor signal to outside of spindle
   • Simplify mounting and handling bearings
2. Load detection:
   
   • Contribute to improvement of machining quality and productivity by utilizing it to monitor machining conditions
   • Simplify high precise measurement of preload of bearing when mounting
   • Detect sudden increase in preload of bearing to help prevent seizing of bearing for spindle

Sensor Integrated Bearing “Talking Bearing™”

It integrates a bearing with sensors, power generation unit, and wireless device and transmits information on temperature, vibration, and rotational speed. As its dimension and load capacity are same as those of standard bearings, it can be replaced from bearings used in existing ones, enabling advanced condition monitoring and early abnormality detection easily.

Features

1. Compatibility:
   
   • Have compatibility with standard bearings by incorporating sensors, power generation units, and wireless devices into standard bearing without changing dimension and load capacity
2. Advanced condition monitoring and abnormality diagnosis:
   
   • Detect bearing condition such as vibration and temperature with sensors built in bearing with high sensitivity compared sensors attached to outside of equipment
3. High convenience:
   
   • Cables are not required for power supply and data transmission, and it is easy to mount the product in equipment

Low Dust Generation Bearing for Servo Motors

Compared to the conventional product, this product reduces the amount of dust generated from bearing by approximately 90%.It also reduces the rotational torque by approximately 50% by applying newly developed grease and seal. The new grease suppresses dust generation by improving its components and mixtures, and the new seal achieves both high sealing performance and low torque by improving the shape to uniformize the contact force of the sliding part between the inner ring and the contact type seal.

By applying this product with servo motors for industrial robots, servo motors can be downsized by eliminating the sealing devices, and increase power output by reducing rotational torque of bearings.

Features

1. Low dust: Reduce dust generation by approximately 90%
2. Low torque: Reduce rotational torque by approximately 50%

Wrist Joint Module “i-WRIST™”

It is a compact positioning module that achieves a wide range of angle movement and contribute to save the space. This can move smoothly like human wrist at high-speed to perform minor position (angle) changes, which vertically articulated robots are not good at doing.

“i-WRIST™” contributes to automation of various processes, makes them efficient and reduces manual labor such as appearance inspection, grease application, and cleaning when combining “i-WRIST™” with other robots and attaching end effectors to the equipment.