Press Release

Press Release

July 7, 2020

NSK Ltd.
CSR Division Headquarters
Public Relations Department

NSK's First Endurance Test Unit for Electric Injection Molding Machine Ball Screws Recognized as Tribology Heritage

NSK's First Endurance Test Unit for Electric Injection Molding Machine Ball Screws Recognized as Tribology Heritage

NSK Ltd.'s first Endurance Test Unit for Electric Injection Molding Machine Ball Screws was recognized as Tribology Heritage1 by the Japanese Society of Tribologists2 for its contribution to the advancement of tribology technology.

In injection molding machines, a hydraulic motor was generally used for the feed system that pushes the plastic resin into the mold due to the heavy load. However, from the 1980s onward, the need for electrification has been increasing for its energy conservation and environmental protection aspects. The increased control over resin injection, improved operability, and ease of maintenance offered by electric motors further accelerated the shift away from hydraulic technology.

Since the ball screws used in electric molding machine motors are operated in short strokes and take on an extremely heavy load, maximizing the ball screw's endurance, including the endurance of the lubricant, was a major challenge. This test unit was created in 1990 with the aim of increasing the endurance of ball screws, making it possible to evaluate and improve prototypes. The unit went on to make contributions to the enhancement of electric molding machine performance and the advancement of the electrification of industrial machinery.

Click here for more information on products for electric injection molding machines.

NSK will continue to leverage its world-leading technical prowess to realize a safe, comfortable, and environmentally-friendly society, and further the advancement of industry.

1: The Japanese Society of Tribologists was established in 1956 with the aim of improving technology related to tribology (the science and technology of interacting surfaces in relative motion).

2: Tribology Heritage is an award that aims to identify and preserve technology that has made significant contributions to tribology throughout the history of the development of science and technology in the field. NSK's first roller bearing design drawing was the first technological artifact to be recognized as Tribology Heritage.

Japanese Society of Tribologists website: https://www.tribology.jp/indexe.htm New Window

NSK's First Endurance Test Unit for Electric Injection Molding Machine Ball Screws
NSK's First Endurance Test Unit for Electric Injection Molding Machine Ball Screws
Japanese Society of Tribologists Certificate of Tribology Heritage
Japanese Society of Tribologists Certificate of Tribology Heritage

About NSK

NSK began its journey manufacturing the first bearings in Japan in 1916, and has since developed into a global organization researching, designing, and manufacturing Motion & Control™ solutions essential for mobility and industrial applications. NSK is the top supplier of bearings in Japan and is the third largest supplier in the world by market share.

Our responsive products and technologies enhance automotive performance and industrial productivity while reducing energy consumption to unprecedented low levels. In the early 1960s, we set our sights outside Japan and have established over 200 business locations in 30 countries alongside a vast network of joint ventures and partnerships in all corners of the world.

NSK Corporate Philosophy

NSK contributes to a safer, smoother society and helps protect the global environment through its innovative technology integrating Motion & Control. As a truly international enterprise, we are working across national boundaries to improve relationships between people throughout the world.