Method for dressing a multithread grinding worm

Patent metadata

Field	Value
Publication number	US-10016829-B2
Application number	US-201615207373-A
Country	US
Kind code	B2
Filing date	Jul 11, 2016
Priority date	Jul 10, 2015
Publication date	Jul 10, 2018
Grant date	Jul 10, 2018

Abstract

The present disclosure relates to a method for dressing a multithread grinding worm, in which a flight of the multithread grinding worm is machined by means of a dressing tool. During machining of the multithread grinding worm, one of several flights of the grinding worm is eliminated, so that the number of flights of the grinding worm is reduced, thereby increasing the service life of the dressing tool and reducing the number of dressing tools to be kept in stock.

First claim

The invention claimed is:

1. A method for dressing a multithread grinding worm having a plurality of flights, comprising:
machining a flight of the grinding worm with a dressing tool, wherein during machining at least one of the plurality of flights of the grinding worm is set back in terms of tooth width and/or tooth height with respect to the original flank, so that the number of flights of the grinding worm is reduced.

2. The method according to claim 1 , wherein the dressing tool has a tooth width which is greater than a width of a gap between opposing first and second flanks of the flight being machined.

3. The method according to claim 2 , wherein the tooth width of the dressing tool is greater than 110% of the width of the gap between the opposing first and second flanks of the flight being machined.

4. The method according to claim 2 , wherein the tooth width of the dressing tool is greater than 125% of the width of the gap between the opposing first and second flanks of the flight being machined.

5. The method according to claim 2 , the tooth width of the dressing tool is greater than 150% of the width of the gap between the opposing first and second flanks of the flight being machined.

6. The method according to claim 1 , wherein the dressing tool is applied flush to a flank of the flight being machined and during machining partly or completely removes the corresponding other flank of the flight being machined.

7. The method according to claim 6 , wherein the dressing tool subsequently is applied flush to a flank facing the removed flank in a flight adjacent to the removed flank.

8. The method according to claim 1 , wherein during machining of the flight, a tooth base of the flight is removed by the dressing tool.

9. The method according to claim 1 , wherein during machining of the flight, only a partial region of the grinding worm is machined.

10. The method according to claim 1 , wherein the dressing tool is a double dresser, the method further comprising machining two different flanks of the grinding worm at one time with the double dresser.

11. The method according to claim 1 , wherein during machining of the flight, the dressing tool is pivoted on a worm flank in a worm gap, so that the counter flank also is dressed in the worm gap.

12. A method, comprising:
with a dressing tool, simultaneously machining a first flank of first flight of a multi-thread grinding worm and reducing the size of a tooth separating the first flight from an adjacent second flight, wherein a second flank of the first flight opposing the first flank is also a first flank of the tooth and wherein a first flank of the second flight is also a second flank of the tooth;
subsequently, with the dressing tool, simultaneously machining a second flank of the second flight opposing the first flank of the second flight and further reducing the size of the tooth.

13. The method of claim 12 , wherein by way of the machining of the first flank of the first flight and the second flank of the second flight, the tooth separating the first flight from the second flight is eliminated and a number of flights of the grinding worm is reduced by 1.

14. The method of claim 13 , wherein an immersion depth of the dressing tool during the machining is greater than a height of the tooth separating the first flight from the second flight such that a depth of an enlarged flight formed by the elimination of the tooth is greater than a depth of the first and second flights before the machining.

15. The method of claim 12 , wherein by way of the machining of the flank of the first flight and the opposing flank of the n th flight, the plurality of teeth separating the first flight from the n th flight is eliminated and a number of flights of the grinding worm is reduced by n−1.

16. The method of claim 15 , wherein an immersion depth of the dressing tool during the machining is greater than a height of the one or more of the plurality of teeth such that a depth of an enlarged flight formed by the elimination of the plurality of teeth is greater than a depth of the first through n th flights before the machining.

17. A method, comprising:
with a dressing tool, simultaneously machining a flank of a first flight of a multi-thread grinding worm and reducing the size of a plurality of teeth, each tooth of the plurality of teeth separating two adjacent flights of the grinding worm, and the plurality of teeth separating the first flight from a n th flight of the grinding worm;
subsequently, with the dressing tool, simultaneously machining a flank of the n th flight which opposes the flank of the first flight and further reducing the size of the plurality of teeth separating the first flight from the n th flight.

Assignees

• Liebherr Verzahntech Gmbh

Inventors

• Mundt Alois

Classifications

• B23G1/38

  with grinding discs guided along the workpiece in accordance with the pitch of the required thread · CPC title

• B23F23/1231 Primary

  using a gear-shaped dressing tool · CPC title

• B24B53/083

  for tools having a screw-thread profile (B24B53/081 takes precedence) · CPC title

• B23F23/1225

  Arrangements of abrasive wheel dressing devices on gear-cutting machines (dressing devices per se B24B53/00) · CPC title

• B24B53/075 Primary

  for workpieces having a grooved profile, e.g. gears, splined shafts, threads, worms (B24B53/07 takes precedence) · CPC title