Method of manufacturing tooth-shaped component, and tooth-shaped component

Patent metadata

Field	Value
Publication number	US-10857582-B2
Application number	US-201615540899-A
Country	US
Kind code	B2
Filing date	Jan 7, 2016
Priority date	Jan 21, 2015
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

A method of manufacturing a tooth-shaped component including a process of draw-forming a workpiece so as to obtain a cylindrical container, which has a bottom surface portion and a side surface portion; a diameter-reducing process of reducing the diameter of a particular part in which a tooth tip portion is to be formed in the side surface portion of the cylindrical container, so as to increase the thickness of a corner portion such that an external shape of the corner portion between the bottom surface portion and the side surface portion satisfies the following conditional expression (ΔR+ΔH)≤2t; and a tooth shape-forming process of forming the tooth tip portion in the particular part of the cylindrical container reduced in diameter in the diameter-reducing process, so as to obtain a tooth-shaped component which has the bottom surface portion, the side surface portion, and the tooth tip portion.

First claim

The invention claimed is:

1. A method of manufacturing a tooth-shaped component, comprising:
a drawing process of draw-forming a workpiece so as to obtain a cylindrical container which has a bottom surface portion and a side surface portion;
a diameter-reducing process of reducing a diameter of a particular part of the side surface portion in which a tooth tip portion is to be formed in the side surface portion of the cylindrical container, so as to increase a thickness of a corner portion between the bottom surface portion and the side surface portion;
a diameter-increasing process of increasing a diameter of the particular part of the cylindrical container obtained through the drawing process, between the drawing process and the diameter-reducing process; and
a tooth shape-forming process of forming the tooth tip portion in the particular part of the cylindrical container reduced in diameter in the diameter-reducing process, so as to obtain a tooth-shaped component which has the bottom surface portion, the side surface portion, and the tooth tip portion,
wherein in the diameter-reducing process,
in a case where the cylindrical container is viewed in a cross section including a central axis direction and a radial direction of the cylindrical container, when an intersection point of a straight line L 1 in parallel contact with the bottom surface portion of the cylindrical container and a straight line L 2 in parallel contact with the side surface portion of the cylindrical container is defined as P 0 , a point at which the straight line L 1 starts being separated from the bottom surface portion of the cylindrical container is defined as P 1 , a point at which the straight line L 2 starts being separated from the side surface portion of the cylindrical container is defined as P 2 , the length between the intersection point P 0 and the point P 1 on the straight line L 1 is defined as ΔR, and the length between the intersection point P 0 and the point P 2 on the straight line L 2 is defined as ΔH,
the corner portion is increased in thickness such that an external shape of the corner portion of the cylindrical container satisfies the following conditional expression (ΔR+ΔH)≤2t, wherein t is a plate thickness of the cylindrical container.

2. The method of manufacturing a tooth-shaped component according to claim 1 ,
wherein the tooth shape-forming process a includes rough tooth shape-forming process of forming a rough tooth shape in the particular part of the cylindrical container reduced in diameter in the diameter-reducing process, and a complete tooth shape-forming process of forming a complete tooth shape as the tooth tip portion in the particular part by processing the rough tooth shape.

3. The method of manufacturing a tooth-shaped component according to claim 1 , wherein the workpiece is a flat sheet which has peak portions and valley portions provided so as to alternately appear along a circumferential direction having a member axis as a center, and the peak portions are parts which protrude outwardly from the valley portions in a radial direction having the member axis as the center.

4. The method of manufacturing a tooth-shaped component according to claim 1 ,
wherein the workpiece is a circular flat sheet or a polygonal flat sheet.

5. The method of manufacturing a tooth-shaped component according to claim 1 ,
wherein the workpiece is a flat sheet which has peak portions and valley portions provided so as to alternately appear along a circumferential direction having a member axis as a center, and the peak portions are parts which protrude outwardly from the valley portions in a radial direction having the member axis as the center,
wherein in the drawing process, the workpiece is draw-formed such that the peak portions and the valley portions are included in the side surface portion of the cylindrical container, and
wherein in the diameter-reducing process, the peak portions included in the side surface portion of the cylindrical container obtained through the drawing process is reduced in diameter, as the particular part.

6. The method of manufacturing a tooth-shaped component according to claim 5 ,
wherein in the drawing process, a punch and a die, having coaxially disposed central axes are used,
wherein the punch has a punch flat surface portion parallel to a radial direction orthogonal to the central axis of the punch, and a punch side surface portion connected to the punch flat surface portion via a punch curved surface portion, wherein the punch side surface portions extends in a first direction parallel to the central axis of the punch, and peak sites and valley sites elongated in the first direction are formed in the punch side surface portion,
wherein the die has a die flat surface portion parallel to a radial direction orthogonal to the central axis of the die, and a die side surface portion connected to the die flat surface portion and extending in the first direction of the punch, and peak sites and valley sites elongated in the first direction are formed in the die side surface portion, and
wherein after the workpiece is positioned on the die such that the peak portions of the workpiece are positioned in the valley sites of the die, the punch is relatively moved in a direction of the die so as to obtain the cylindrical container in which the side surface portion stands upright with respect to the bottom surface portion.

7. The method of manufacturing a tooth-shaped component according to claim 5 ,
wherein in the diameter-reducing process, a punch, a counter punch, and a die disposed in an outer circumference of the counter punch, having coaxially disposed central axes are used,
wherein the punch has a punch flat surface portion parallel to a radial direction orthogonal to the central axis of the punch, and a punch side surface portion connected to the punch flat surface portion via a punch curved surface portion, extending in a first direction parallel to the central axis of the punch, and having a radius equal to an inner radius of the tooth tip portion of the tooth-shaped component,
wherein the counter punch has a counter punch flat surface portion parallel to a radial direction orthogonal to the central axis of the counter punch, and a counter punch side surface portion connected to the counter punch flat surface portion, extending in an opposite direction of the first direction, and having a radius equal to an outer radius of the tooth tip portion of the tooth-shaped component,
wherein the die has a die side surface portion extending in the first direction and having a radius equal to an outer radius of the tooth tip portion of the tooth-shaped component, and a die slope portion connected to the die side surface portion via a die curved surface portion, wherein the die side surface portion is widened in a direction orthogonal to the central axis of the die toward the first direction, and
wherein in a state where the bottom surface portion of the cylindrical container obtained through the drawing process is interposed between the punch and the counter punch, the punch and the counter punch are relatively moved in a direction of the die so as to cause the peak portions included in the side surface portion of the cylindrical container to be reduced in diameter as the particular part.

8. The method of manufacturing a tooth-shaped component according to claim 5 ,
wherein in the tooth shape-forming process, an inner punch, an outer punch disposed in an outer circumference of the inner punch, a counter punch, and a die disposed in an outer circumference of the counter punch, having coaxially disposed central axes are used,
wherein the inner punch has an inner punch flat surface portion parallel to a radial directio

Assignees

• Nippon Steel & Sumitomo Metal Corp
• Nippon Steel Corp

Inventors

• Yamagata Mitsuharu
• Yamamoto Shuji
• Tsukano Yasushi

Classifications

• B21D53/28 Primary

  gear wheels · CPC title

• B21D45/02

  Ejecting devices · CPC title

• B21D22/30 Primary

  to finish articles formed by deep-drawing · CPC title

• B21D41/04

  Reducing; Closing · CPC title

• F16H55/17

  Toothed wheels (worm wheels F16H55/22; chain wheels F16H55/30) · CPC title