NTN Develops Resin Retainer That Allows High Speed Rotation for Grease Lubricated Bearings for Machine Tool SpindlesOctober 29, 2024
- Realizing high speed rotational performance supporting dmn value of 1.35 million of industry's highest level as injection molded resin retainers
NTN Corporation (hereafter, NTN) has developed the resin retainer realizing high speed rotational performance supporting dmn value*1 of 1.35 million of industry's highest level as injection molded resin retainers for grease lubricated bearings for machine tool spindles. We will contribute to shortening machining times and saving energy of machining tools by expanding the application range of grease lubricated bearings with the developed injection molded resin retainers adapting to high speed rotation, which feature with excellent productivity as well.
- An indicator that expresses the rotational performance of bearings and is multiplied bearing pitch circle diameter (mm) by rotational speed (min-1)
Grease lubricated bearing for machine tools
Machine tools (machining centers) and spindle
Background of development
As rotation speed of machine tools becomes higher to shorten machining times, high speed rotational performance is also required for bearings for machine tool spindles. Either air-oil or grease is used as lubrication methods for spindle bearings. Generally, air-oil lubrication is used for high speed rotation. However, since air-oil lubrication requires additional facilities for supplying air-oil and collecting oil mist, the need for grease lubrication for high speed rotation has increased in recent years along with the shift to grease lubrication for saving energy.
NTN has realized high speed rotational performance in injection molded resin retainers with excellent productivity by optimizing the design and materials.
Features
| High speed rotational performance: dmn value of 1.35 million (industry's highest level as injection molded resin retainers, 20% improvement compared to the conventional product) | By using highly heat-resistant materials through repeated analysis, rotating tests, and strength tests, deformation caused by heat generated due to high speed rotation can be suppressed. This retainer is designed to be used in high speed rotational conditions with sufficient durability to support industry's highest level in high speed rotational performance of dmn value of 1.35 million as bearings using injection molded resin retainers. It can be applied to high speed rotation areas where the conventional injection molded resin retainers could not be available, facilitating the switch the lubrication type from air-oil to grease. |
|---|
In addition, this retainer controls the greasing behavior during the initial rotation after mounting by optimizing the shape, suppressing the temperature rise including the running-in operation and realizing a long operating life design.
NTN will apply the newly developed retainer to grease lubricated bearings for machine tools including the ULTAGE Series*2, and propose the switch from air-oil lubricating type bearings globally. In addition to retainers, we are developing grease and other components of bearings to pursue further high speed rotational performance with grease lubricated bearings, contributing to improved productivity and saving energy in various manufacturing sites.
NTN will exhibit this product at the “JIMTOF2024 The 32nd JAPAN INTERNATIONAL MACHINE TOOL FAIR” held in Tokyo Big Sight from November 5 to 10.
- ULTAGE is the name for NTN's goal of achieving the ultimate performance with precision bearings, and expresses the “Ultimate” performance on any type of “Stage.”
Applications
Machine tool spindles (multi-function machines, machining centers, lathes), etc.
Structure
Image of grease behavior analysis on bearing rolling surface
Durability evaluation of the developed retainer with critical velocity
Inquiries about this release
