Form rolling apparatus and form rolling method

Patent metadata

Field	Value
Publication number	US-9707616-B2
Application number	US-201414518642-A
Country	US
Kind code	B2
Filing date	Oct 20, 2014
Priority date	Dec 27, 2013
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

A form rolling apparatus for applying in-feed form rolling to a rod-shaped material includes a support portion configured to support the rod-shaped material to be axially rotatable, a round die formed with die teeth on an outer periphery thereof, the die teeth configured to be positioned facing an outer periphery surface of the rod-shaped material, and a moving device moving the round die so that a distance of axes of the round die and the rod-shaped material changes. The die teeth includes forming die teeth for generating gear teeth on the outer periphery surface of the rod-shaped material and finishing die teeth enhancing a tooth surface precision of the generated gear teeth by engaging with the generated gear tooth and rotating. The finishing die teeth are formed in a configuration each having an addendum that does not come to contact a bottom land of the generated gear teeth.

First claim

The invention claimed is:

1. A form rolling apparatus for applying in-feed form rolling to an outer periphery surface of a rod-shaped material to generate helical gear teeth, the form rolling apparatus comprising:
a support portion configured to support the rod-shaped material to be axially rotatable;
a round die formed with die teeth on an outer periphery thereof, the round die being rotatable about a rotational axis which is configured to be arranged in parallel with an axial direction of the rod-shaped material configured to be supported by the support portion, the die teeth configured to be positioned facing the outer periphery surface of the rod-shaped material configured to be supported by the support portion;
a rotation drive device rotationally actuating the round die; and
a moving device moving the round die in a direction orthogonal to the rotational axis of the round die so that a distance of axes of the round die and the rod-shaped material changes;
wherein the die teeth includes forming die teeth for generating the gear teeth on the outer periphery surface of the rod-shaped material and finishing die teeth enhancing a tooth surface precision of the generated gear teeth by engaging with the generated gear tooth and rotating; and
wherein the finishing die teeth each have an addendum region that is less than an addendum region of the forming die teeth by a predetermined length.

2. The form rolling apparatus according to claim 1 , wherein the finishing die teeth include a tooth depth that is shorter than a tooth depth of the forming die teeth.

3. The form rolling apparatus according to claim 1 , wherein a dedendum region of the finishing die teeth is the same as a dedendum region of the forming die teeth.

4. The form rolling apparatus according to claim 1 , wherein the finishing die teeth and the forming die teeth have a same tooth profile except for the respective addendum regions of the finishing die teeth and the forming die teeth.

5. The form rolling apparatus according to claim 1 , wherein the addendum region of the finishing die teeth is the same as the addendum region of the forming die teeth except for a cut portion extending from a top land of the forming die teeth by the predetermined length.

Assignees

• Aisin Seiki

Inventors

• Nagata Eiri

Classifications

• Y10T29/49467

  Gear shaping · CPC title

• B21H5/02 Primary

  with cylindrical outline {, e.g. by means of die rolls (worms B21H5/005)} · CPC title

• B21B39/26

  by members, e.g. grooved, engaging opposite sides of the work and moved relatively to each other to revolve the work · CPC title

• B21H5/022

  Finishing gear teeth with cylindrical outline, e.g. burnishing · CPC title

• B21B1/16

  for rolling {wire rods, bars, merchant bars, rounds} wire or material of like small cross-section · CPC title