No.1022E 2026Special Edition on the Technologies that Support Manufacturing and Manufacturing Equipment Development of Mass-Production Thread Rolling Machine for Ball Screws in Rack-Parallel Type Electric Power Steering (RP-EPS) |
| Category | TECHNICAL PRODUCT |
|---|---|
| Author | Materials Innovation Engineering Dept., Production Engineering Division Machine Tools Engineering Dept., Machine Tools & Manufacturing Systems Business Unit |
| Abstract | For the mass production of ball screws used in rack-parallel-type electric power steering systems, a new thread rolling machine was developed to consolidate the three process – turning, grinding, and super finishing – into a single process – rolling. This machine offers improved operability and ease of maintenance through an inclined structured slide table equipped with a thread rolling die. In addition, optimization of the die geometry, quantification of process error factors, and error-correction processing improved shape accuracies and enabled integration of this into the mass production line. This report presents characteristics and features the developed thread rolling machine. |
| Keyword | rack parallel type electric power steering, RP-EPS, ball screw, process integration, thread rolling machine, inclined structure |
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