Apparatus for metal-cutting machining of wear-affected bit holders of road milling machines, and use of an apparatus for overhauling such wear-affected bit holders

Patent metadata

Field	Value
Publication number	US-11273502-B2
Application number	US-201715826794-A
Country	US
Kind code	B2
Filing date	Nov 30, 2017
Priority date	Dec 9, 2016
Publication date	Mar 15, 2022
Grant date	Mar 15, 2022

Abstract

An apparatus for metal-cutting machining of wear-affected bit-head-proximal end regions of bit holders of road milling machines encompasses:a rotary actuator having an output member rotating around an actuator rotation axis;at least one material-removing tool, rotatable around a tool rotation axis, which is coupled or couplable to the output member so as to rotate together;a positioning arbor, extending along an arbor axis, which is embodied for introduction into a bit receptacle opening of a bit holder and which comprises an abutment segment, located radially remotely from the arbor axis and facing away from the arbor axis in a direction having a radial component, which is embodied for abutment against an inner wall of the bit receptacle opening.A material-removing region, populated with cutting edges, of the material-removing tool is arranged between the positioning arbor and the output member.

First claim

The invention claimed is:

1. An apparatus for metal-cutting machining of wear-affected bit-head-proximal end regions of bit holders of a road milling machine, comprising:
a rotary actuator including an output member rotatable around an actuator rotation axis;
at least one material-removing tool rotatable around a tool rotation axis, the at least one material-removing tool being configured to be coupled to the output member so that the at least one material-removing tool and the output member are rotatable together;
a positioning arbor extending along an arbor axis, the positioning arbor being configured to be introduced into a bit receptacle opening of at least one of the bit holders, the positioning arbor including an abutment segment located radially remotely from the arbor axis and facing away from the arbor axis in a direction having a radial component, the abutment segment including an abutment surface configured for abutment against an inner wall of the bit receptacle opening, the abutment surface including all surface area of the positioning arbor that abuts against the inner wall, and the abutment surface extending continuously completely around the arbor axis;
wherein the at least one material-removing tool includes a material removing region;
wherein the tool rotation axis is configured to be always parallel to and spaced laterally from the arbor axis during a material-removing operation so that the at least one material-removing tool is arranged to generate by the material-removing operation a flat end surface extending normal to the arbor axis on an uppermost end of the at least one of the bits holders with respect to said arbor axis and surrounding a bit introduction orifice of the bit receptacle opening of the at least one of the bit holders when the positioning arbor is received in the bit receptacle opening; and
wherein during machining of the flat end surface, the entirety of the at least one material-removing tool is arranged between the output member and the entirety of the abutment surface of the positioning arbor in a direction that extends parallel to the tool rotation axis.

2. The apparatus of claim 1 , wherein:
the at least one material-removing tool is rotatable both around the tool rotation axis and around the arbor axis.

3. The apparatus of claim 1 , wherein:
the positioning arbor includes an arbor core located radially inward from the abutment segment, the arbor core and the abutment segment being rotatable relative to one another around the arbor axis, the abutment segment extending continuously completely around the arbor core.

4. The apparatus of claim 1 , further comprising:
a tool carrier, the at least one material-removing tool being connected to the tool carrier and rotatable relative to the tool carrier about the tool rotation axis, the tool rotation axis being nondisplaceable relative to the tool carrier.

5. The apparatus of claim 4 , wherein:
the tool carrier is coupled to the positioning arbor so that the tool carrier and at least a portion of the positioning arbor move together.

6. The apparatus of claim 4 , wherein:
the positioning arbor includes an arbor core located radially inward from the abutment segment, the arbor core being rotatable relative to the abutment segment around the arbor axis; and
the tool carrier is coupled to the arbor core so that the tool carrier and the arbor core are rotatable together around the arbor axis relative to the abutment segment.

7. The apparatus of claim 1 , wherein:
the tool rotation axis is offset from the actuator rotation axis; and the apparatus further includes a torque-transferring transmission between the output member and the at least one material-removing tool.

8. The apparatus of claim 7 , wherein:
the at least one material-removing tool includes a plurality of material-removing tools, each material-removing tool being rotatable around a respective tool rotation axis; and
the transmission provides torque-transferring connection of each material-removing tool to the output member.

9. The apparatus of claim 8 , wherein:
the transmission includes a planetary gearset including a sun gear and a plurality of planet gears, the output member being coupled to the sun gear and each of the plurality of material-removing tools being coupled to a respective planet gear.

10. The apparatus of claim 1 , wherein:
the actuator rotation axis is arranged parallel to the tool rotation axis and laterally spaced therefrom.

11. The apparatus of claim 1 , wherein:
the actuator rotation axis is arranged collinearly to the tool rotation axis.

12. The apparatus of claim 1 , wherein:
the positioning arbor includes a stop defined on a longitudinal end of the positioning arbor located farthest away from the at least one material-removing tool, the stop being configured to limit, advancement of the positioning arbor along the arbor axis into the bit receptacle opening.

13. The apparatus of claim 1 , in combination with the at least one of the bit holders, wherein:
the at least one of the bit holders is a quick-change bit holder of the road milling machine, the at least one of the bit holders including the bit receptacle opening extending along a receptacle axis into the at least one of the bit holders.

14. The apparatus of claim 13 , wherein:
the arbor axis is arranged collinearly with the receptacle axis when the positioning arbor is introduced into the bit receptacle opening.

15. The apparatus of claim 1 , wherein:
the abutment segment extends along the arbor axis over a distance longer than a diameter of the inner wall of the bit receptacle opening when the abutment surface is engaged with the inner wall of the bit receptacle opening.

16. The apparatus of claim 1 , wherein:
the abutment segment extends along the arbor axis over a distance at least twice a diameter of the inner wall of the bit receptacle opening when the abutment surface is engaged with the inner wall of the bit receptacle opening.

17. An apparatus for metal-cutting machining of wear-affected bit-head-proximal end regions of bit holders of a road milling machine, comprising:
a rotary actuator including an output member rotatable around an actuator rotation axis;
at least one material-removing tool rotatable around a tool rotation axis, the at least one material-removing tool being configured to be coupled to the output member so that the at least one material-removing tool and the output member are rotatable together;
a positioning arbor extending along an arbor axis, the positioning arbor being configured to be introduced into a bit receptacle opening of at least one of the bit holders, the positioning arbor including an abutment segment located radially remotely from the arbor axis and facing away from the arbor axis in a direction having a radial component, the abutment segment being configured for abutment against an inner wall of the bit receptacle opening over a distance along the arbor axis longer than a diameter of the inner wall of the bit receptacle opening;
wherein the at least one material-removing tool includes a material removing region arranged between the positioning arbor and the output member; and
wherein the tool rotation axis is configured to be always parallel to and spaced laterally from the arbor axis so that the at least one material-removing tool is arranged to machine a flat end surface extending normal to the arbor axis and surrounding a bit introduction orifice of the bit receptacle opening of the at least one of the bit holders when the positioning arbor is received in the bit recepta

Assignees

• Wirtgen Gmbh

Inventors

• Abresch Stefan
• Lehnert Thomas
• Reindorf Markus
• Barimani Cyrus

Classifications

• B23C3/007 Primary

  Milling end surfaces of nuts or tubes · CPC title

• B24B27/0076

  grinding machines comprising two or more grinding tools · CPC title

• B23C3/36 Primary

  Milling milling-cutters (B23C3/28 takes precedence) · CPC title

• B23C3/122

  of pipes or cylinders · CPC title

• B23C2220/16

  Chamferring · CPC title