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Seiko introduced to improve fretting wear properties of the machine tool table
Seiko has developed a machine with a bench swing work hard fretting occurs the "axis of high acceleration and deceleration swing table", and "The 24th Japan International Machine Tool Fair (JIMTOF2008)" (2008 October 30 ~ November 4, Tokyo Big Sight International Exhibition Center) on the reference display (Figure). Fretting wear is the swing factor in the rolling work, the two contact surfaces due to repeated small relative sliding wear generated. The company by improving the composition tables of the ball screw bearings, linear slide and ball screw, successfully improved fretting wear resistance. If the rolling elements swing and sustained due to slight shaking, oil would be difficult to supply the entire contact surface, which occurs fretting wear.
To prevent this phenomenon, the company had switched into a false instruction by reciprocating motion (installation of false instruction cycle), then the supply of lubricant to the contact surface. However, considering productivity, save hope this step as much as possible. Therefore, the mechanical elements of three separate improvements. First improvement is the ball screw bearings. Ball did not use steel, but by the ceramic (silicon nitride) is made. In the rotation speed of 80min-1, swing angle of 2.5 °, in order to "NSKGREASEAS2" test under the conditions of lubrication, the original ball would take place within 24 hours of wear, and ceramic ball 400 hours no problem. "If you are metal, then because of mutual attraction, so it is prone to fretting wear. Qiang balls of steel into the ceramic material can be increased fretting wear a big step forward" (the company). Followed by improved linear slide. The company will be rolling converted by the roller ball. A ball, because the point contact, easy to slide, so susceptible to fretting wear. The use of roll hour of midnight, the line contact form, so is not easy to slip, that is not prone to fretting wear. Finally, improved ball screw.
A steel ball and ceramic ball ball, oil has "NSKGREASEAS2" and "NSKGREASENF2", these were combined for comparison. Specifically, Ball and lubricants were used (1) steel ball and "NSKGREASELR3"; (2) steel ball and "NSKGREASENF2"; (3) ceramic ball, and "NSKGREASELR3". Here the lubricant "NSKGREASENF2" using a low-viscosity base oil, thickener, and good flow properties with high resistance to wear additives, anti-wear performance than "NSKGREASELR3" high. For these three kinds of circumstances, in the rotation speed of 0.6min-1, stroke 0.02mm, swing angle of 0.45 °, swing time of 400 hours (3,000,000 cycles), swing under the conditions of test, the results show that the standard specifications ( 1) occurred in 2 ~ 3 m fretting wear and tear, (2) loss of less than fretting 1 m, and (3) that the loss of almost no micro. Namely fretting wear prevention, (2) and (3) ideal. Certainly, cost (3) Max. Embossing process are used for home appliances and automotive interior components such as molding resin used for the surface area in the hope that the original etching and sandblasting on the machining process to mold a loud voice for direct etching. If the improved machine tool table fretting wear resistance, can meet these needs, develop new areas of embossing process.
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