Title:
METHOD OF MANUFACTURING MULTI-THREAD FEMALE SCREW AND TAP TOOL
Document Type and Number:
Japanese Patent JP2019048352
Kind Code:
A
Abstract:
To provide a method of manufacturing a multi-thread female screw and a tap tool that has excellent processing accuracy while reducing processing resistance during processing.SOLUTION: In formation of a multi-thread female screw M with a number of threads J, a tap tool T is inserted into a work W with a prepared hole M0 formed in advance, the tap tool T including Y threads of blades En for processing screw grooves Mn equivalent to a measure Y of the number of threads J which is a natural number larger than 1 and smaller than J, and being formed so that the Y threads of blades En are point symmetry relative to an axis X. Then, the tap tool T and the work W are relatively moved along the axis X while relatively being rotated around the axis X. Then, basic processing for forming a multi-thread female screw M of Y threads in the work W is executed (J/Y) times while positioning the blade En at a part where formation of the multi-thread female screw M has not finished in the prepared hole M0 by relatively rotating the tap tool T and the work W by an angle equivalent to a multiple of (360/J) degrees around the axis X.SELECTED DRAWING: Figure 2
Inventors:
YOSHIDA MASAMICHI
KURITA NOBUAKI
KURITA NOBUAKI
Application Number:
JP2017173742A
Publication Date:
March 28, 2019
Filing Date:
September 11, 2017
Export Citation:
Assignee:
AISIN SEIKI
International Classes:
B23G1/16; B23G5/06
Attorney, Agent or Firm:
Mountain Saki Tetsuya