Japan, Sept. 18 -- NTN CORP has got intellectual property rights for 'CASTING METHOD FOR INSIDE JOINT MEMBER OF CONTANT-VELOCITY UNIVERSAL JOINT.' Other related details are as follows:
Application Number: JP,2023-008864
Category (FI): B21J5/02@C,B21J13/02@N
Stage: PROBLEM TO BE SOLVED: To provide a casting method for inside joint members of a constant-velocity universal joint in which a facility can be simplified and costs of the facility can be suppressed, while casting performance can be improved using a flat raw material and a molded product in a shape which is hard to process can be obtained.SOLUTION: A casting method for inside joint members of a constant-velocity universal joint, in which track grooves are formed inclining in a circumferential direction with respect to a shaft line of a joint and the inclination directions of the track grooves adjacent to each other in the circumferential direction are opposed to each other, includes a molding step which uses a plurality of divided dies which have track groove constituting surfaces at inner ends thereof and can move in a radial direction, a die base for positioning the divided dies in the radial direction and in the circumferential direction, and a mold comprising a pair of punches for pressurizing a raw material in an axis direction. The divided dies are divided into a first group and a second group which have the track groove constituting surfaces inclining in the same direction, where movement distances of the groups by which the dies are opened to outside in the radial direction are set to be equal and a movement distance by which the divided dies of the first group are opened to the outside in the radial direction is set to be shorter than that of the second group. A raw material W1 is guided by inner ends of the divided dies of the first group, in order to put in the raw material.SELECTED DRAWING: Figure 5 (Grant)
Filing Date: Jan. 24, 2023
Publication Date: Aug. 5, 2024
The original document can be viewed at: https://www.j-platpat.inpit.go.jp/p0100
Disclaimer: Curated by HT Syndication.
