Linear Motion R and D to Improve Reliability

THK, the leading global designer, developer and manufacturer of linear motion solutions, has announced the latest results from its ongoing programme of research and development into linear motion technology. In particular, the company has expanded still further the parameters within which linear guides and actuators can be used, with prototype systems that can resist a range of temperatures and vacuum conditions that are considerably higher than anything previously achieved. The focus of THK's R and D programme is to evolve a new generation of linear motion technology that can be used both in the most extreme operating conditions, such as in the offshore and defence industries, and in mainstream manufacturing and process applications in order to make dramatic improvements in reliability as well as reduce operating costs. The new prototype systems incorporate a range of new and unique properties and capabilities, including the ability to operate reliably at vacuum pressures down to 10-3 Pa or at sustained temperatures in excess of 200 deg C. These properties have been achieved by the use of the latest high performance steels and alloys, specially developed vacuum greases, with minimal emission characteristics and perflouroelastomer seals that are capable of withstanding both chemical attack and extreme environmental conditions. To improve functionality and reliability still further, many of the prototypes feature THK's ground breaking Caged Ball technology, which eliminates the problems of noise, friction, particle emission and wear associated with conventional ball race configurations, by enclosing high precision steel balls within a separator cage, with controlled density grease pockets surrounding each ball. This effectively prevents contact between the balls during operation, leading to significant improvements in both overall performance and operating life, and to quieter, cleaner, smoother and higher precision movement, with a far longer service life than traditional ball raceways. Perhaps most importantly, THK's Caged Ball technology enables linear motion systems both to be used in a far wider range of applications, and to become fit and forget products, enabling machine builders and end users to benefit from considerable cost savings, in terms of both labour and materials.