Title:
ボールねじ用盛上げタップ
Document Type and Number:
Japanese Patent JP7297943
Kind Code:
B2
Abstract:
A thread forming tap 10 for a ball screw, the thread forming tap 10 being formed so that: a thread crest 18 of a biting part is provided with an advancing-side flank surface 18a that serves as a front leading side when screwed into a pilot hole, and a trailing-side flank surface 18b that serves as a rear side in the same situation; and in the biting part, the indentation depth Da of the leading-side flank surface 18a of the thread crest 18 with respect to an article 40 being processed is less than the indentation depth Db of the trailing-side flank surface 18b of the thread crest 18 with respect to the article 40 being processed. Due to this configuration, a counterforce Fa from the article 40 being processed that is applied to the leading-side flank surface 18a in order to plastically deform the article 40 being processed is less than a counterforce Fb from the article 40 being processed that is applied to the trailing-side flank surface 18b during a tapping process. Therefore, pressure and friction with respect to the leading-side flank surface 18a are suppressed during the tapping process, and a highly precise ball screw is obtained.
Inventors:
Kazumitsu Harada
Application Number:
JP2021572173A
Publication Date:
June 26, 2023
Filing Date:
January 21, 2020
Export Citation:
Assignee:
OSG Corporation
International Classes:
B23G7/02; B21H3/08; B23G5/06
Domestic Patent References:
| JP274127U | ||||
| JP1289615A |
Foreign References:
| EP0004089A1 | ||||
| US20110085867 | ||||
| CN209632043U |
Attorney, Agent or Firm:
Haruyuki Ikeda
Kojiro Ikeda
Kojiro Ikeda