Contributing to the electrification of large injection molding machines ~ Nippon Seiko Co., Ltd. (Headquarters: Shinagawa-ku, Tokyo, representative: Representative Executive President Toshihiro Uchiyama, hereinafter referred to as NSK), successfully expanded the 'high-load drive ball screw' The size series contributes to the injection molding of large resin parts. It is estimated that by 2018, the overall sales of NSK large and high-load ball screws will reach 1 billion yen. Development background With the energy saving of automobiles and the strengthening of exhaust emission regulations, higher requirements are placed on the weight reduction of hybrid vehicles and electric vehicles. Therefore, the demand for large resin parts such as internal parts around the instrument panel and large integrated bumpers and door parts is gradually increasing. In the past, the molding of large parts was mainly performed by high-load hydraulically driven injection molding machines, but now there are increasing calls in the market for energy-saving and environmentally friendly electric injection molding machines that do not use hydraulic pressure. As a result, NSK has succeeded in developing the 'Ball Screw for High Load Drive' for large electric injection molding machines. Features of the product 1. Developed a new nut channel grinding method, which can realize the thread channel processing of nuts with a total length of 800mm (1.4 times that of the original product). Independently developed the thread channel grinding technology for long-sized nuts that were previously difficult to process. , thus achieving an increase in the number of loaded steel balls inside the nut, increasing the maximum axial load of the ball screw to 1.3 times, and the life of the ball screw to 2.8 times the original. 2. To achieve high speed, the steel ball circulation adopts a special design of circulation along the tangential direction. Even a large ball screw with a shaft diameter of φ140mm or more and a ball diameter of 1 inch can also achieve high-speed operation. (The limit dn value is 100,000) *: dn value: shaft diameter (mm) × screw speed (min-1) Nowadays, ball screws for high-load drive are indispensable for driving electric injection molding machines and servo presses important mechanical parts. In 1996, NSK took the lead in serializing the 'ball screw for high-load drive' in the industry, and then further enriched and expanded the product series to meet the requirements of high-speed products and reduced lubricant use. In the future, NSK will continue to aim to meet the various needs of the market and provide various solutions to customers as 'Your Real Partner.'™.