Device and method for welding hard material elements onto teeth of a saw blade
View Patent ↗The invention relates to a device ( 2 ) for welding hard material elements ( 4 ) onto teeth ( 6 ) of a saw blade ( 8 ), comprising a saw blade feed device ( 12 ) for moving the saw blade ( 8 ) in a feed direction ( 14 ), such that a tooth ( 6 a ) of the saw blade ( 8 ) can be brought into a target position ( 16 ) in a working region ( 10 ) of the device ( 2 ), comprising a first centering device ( 30 ) for centering the saw blade ( 8 ) transversely to the feed direction ( 14 ), comprising a second centering device ( 32 ) for centering a respective hard material element ( 4 ) transversely to the feed direction ( 14 ), comprising a resistance welding device ( 24 ) having a welding electrode ( 26 ) that can be deployed into and withdrawn from the working region ( 10 ), comprising a supply device ( 28 ) for supplying and transferring a respective hard material element ( 4 ) to the welding electrode ( 26 ), and it being possible for the welding electrode ( 26 ) to be deployed in such a way that the hard material element ( 4 ) can be brought toward the tooth ( 6 a ) to abut the tooth ( 6 a ). According to the invention, the hard material element ( 4 ) can be centered relative to the centered and fixed saw blade ( 8 ) by means of the second centering device ( 32 ), and the first and second centering device ( 30 ) are provided in a common assembly ( 38 ), such that the centering of the saw blade ( 8 ) by the first centering device ( 32 ) predetermines a centering position for the subsequent centering of the hard material element ( 4 ) by the second centering device ( 32 ).
1. Device ( 2 ) for welding hard material elements ( 4 ) onto teeth ( 6 ) of a saw blade ( 8 ), including a band or circular saw blade, comprising:
a saw blade feed device ( 12 ) for moving the saw blade ( 8 ) in a feed direction ( 14 ), such that a respective intended tooth ( 6 a ) of the saw blade ( 8 ) can be brought into a target position ( 16 ) in a working region ( 10 ) of the device ( 2 ),
a first centering device ( 30 ) for centering the saw blade ( 8 ) transversely to the feed direction ( 14 ) and for fixing the saw blade ( 8 ) while a respective hard material element ( 4 ) is welded on,
a supply device ( 28 ) for supplying the respective hard material element ( 4 ),
a second centering device ( 32 ) for centering the respective hard material element ( 4 ) transversely to the feed direction ( 14 ) before the welding,
a resistance welding device ( 24 ) having a welding electrode ( 26 ) that can be deployed into the working region ( 10 ) and withdrawn from the working region ( 10 ),
the supply device ( 28 ) being configured to supply and transfer the respective hard material element ( 4 ) to the welding electrode ( 26 ), and deploy the welding electrode ( 26 ) with the respective hard material element ( 4 ) transferred thereto into the working region ( 10 ) so that the respective hard material element ( 4 ) can be brought toward the respective intended tooth ( 6 a ) in the target position ( 16 ) to abut the respective intended tooth ( 6 a ), characterized in that
the second centering device ( 32 ) is configured to center the respective hard material element ( 4 ) abutting the respective intended tooth ( 6 a ) relative to the centering of the fixed saw blade ( 8 ), and
the first centering device ( 30 ) and the second centering device ( 32 ) are provided in a common assembly ( 38 ), such that the centering of the saw blade ( 8 ) by the first centering device ( 30 ) predetermines a centering position for a subsequent centering of the respective hard material element ( 4 ) by the second centering device ( 32 ).
2. Device ( 2 ) according to claim 1 , characterized in that the first centering device ( 30 ) for centering and fixing the saw blade ( 8 ) comprises a first gripper arrangement ( 40 ) having first gripper jaws ( 44 a , 44 b ) configured to move toward or away from one another transversely or obliquely to the feed direction ( 14 ).
3. Device ( 2 ) according to claim 2 , characterized in that the first gripper arrangement ( 40 ) comprises a pull-down mechanism, so that the saw blade ( 8 ) that has a band back facing away from the teeth ( 6 ), is brought into abutment with a support surface during the centering and fixing of the saw blade ( 8 ).
4. Device ( 2 ) according to claim 1 , characterized in that the common assembly ( 38 ) comprises at least one double-acting cylinder ( 60 ).
5. Device ( 2 ) according to claim 1 , characterized in that the second centering device ( 32 ) for centering the respective hard material element ( 4 ) before the welding comprises a second gripper arrangement ( 52 ) having second gripper jaws ( 54 a , 54 b ) configured to move toward or away from one another transversely or obliquely to the feed direction ( 14 ).
6. Device ( 2 ) according to claim 5 , characterized in that the second gripper jaws ( 54 a , 54 b ) are configured to guide on the first gripper jaws ( 44 a , 44 b ).
7. Device ( 2 ) according to claim 5 , characterized in that either the first gripper jaws ( 44 a , 44 b ), or the second gripper jaws ( 54 a , 54 b ), or both, is configured to move toward or away from one another via wedge hook or wedge surface gear mechanisms ( 64 a , 64 b ).
8. Device ( 2 ) according to claim 7 , characterized in that the wedge hook or wedge surface gear mechanisms ( 64 a , 64 b ) comprise wedge slides ( 66 a , 66 b ) which are guided in the first gripper jaws ( 44 a , 44 b ) of the first centering device ( 30 ).
9. Device ( 2 ) according to claim 1 , characterized in that the device comprises a measuring sensor device ( 34 ) configured to interact with the saw blade feed device ( 12 ), such that a respective intended tooth ( 6 ) of the saw blade ( 8 ) can be brought into the target position ( 16 ) in the working region ( 10 ) by means of the saw blade feed device ( 12 ) and using the measuring sensor device ( 34 ).
10. Device ( 2 ) according to claim 9 , characterized in that the measuring sensor device ( 34 ) is configured to come into contact with a corresponding tooth ( 6 ) of the saw blade ( 8 ) when the saw blade ( 8 ) is moved in the feed direction ( 14 ).
11. Device ( 2 ) according to claim 10 , characterized in that, when the saw blade ( 8 ) is moved in the feed direction ( 14 ), the measuring sensor device ( 34 ) is configured to come into contact with the corresponding tooth ( 6 ) of the saw blade ( 8 ) that is being moved to the target position ( 16 ).
12. Device ( 2 ) according to claim 11 , characterized in that the measuring sensor device ( 34 ) is configured to come into contact with the corresponding tooth ( 6 ) close to the region of the corresponding tooth ( 6 ) to which the respective hard material element ( 4 ) is to be welded.
13. Device ( 2 ) according to claim 9 , characterized in that the measuring sensor device ( 34 ) is configured to insert into and withdraw from a tooth gap transversely to the feed direction ( 14 ).
14. Device ( 2 ) according to claim 9 , characterized in that the measuring sensor device ( 34 ) is configured to deflect in the feed direction ( 14 ) while a measuring operation is being carried out.
15. Device ( 2 ) according to claim 1 , characterized in that the device comprises a monitoring and detecting device configured for monitoring and detecting the welding action of the device.
16. Device ( 2 ) according to claim 15 , characterized in that, when the second gripper jaws ( 54 a , 54 b ) are reset, the monitoring and detecting device is configured to make an uncovered direct optical and/or thermal detection.
17. Device ( 2 ) according to claim 1 , characterized in that the welding electrode ( 26 ) is configured to magnetically hold the respective hard material element ( 4 ) transferred thereto.
18. Method for welding hard material elements ( 4 ) onto teeth ( 6 ) of a saw blade ( 8 ) using a device ( 2 ) according to claim 1 , characterized in that the method comprises the following steps:
supplying the saw blade ( 8 ) in a feed direction ( 14 ) by means of the saw blade feed device ( 12 );
bringing a respective intended tooth ( 6 a ) of the saw blade ( 8 ) into a target position ( 16 ) in a working region ( 10 ) of the device ( 2 );
centering the saw blade ( 8 ) by means of the first centering device ( 30 ) transversely to the feed direction ( 14 );
fixing the saw blade by means of the first centering device ( 30 );
supplying and transferring the respective hard material element ( 4 ) to a welding electrode ( 26 ) by means of the supply device ( 28 ),
deploying the welding electrode ( 26 ) together with the respective hard material element ( 4 ) transferred thereto into the working region ( 10 );
centering the respective hard material element ( 4 ) brought into the working region by means of the second centering device ( 32 ) transversely to the feed direction before the welding,
welding the respective hard material element ( 4 ) onto the tooth ( 6 a ) in the target position ( 16 ) in the working region;
withdrawing the welding electrode ( 26 ) from the working region ( 10 );
characterized in that
a centering position for the centering of the respective hard material element ( 4 ) by the second centering device ( 32 ) is predetermined by the centering of the saw blade ( 8 ) by the first centering device ( 30 ), such that, when centering the respective hard material element ( 4 ) transversely to the feed direction ( 14 ), the respective hard material ( 4 ) element is centered relative to the previously centered and fixed saw blade ( 8 ).
19. Device ( 2 ) according to claim 2 , characterized in that the common assembly ( 38 ) comprises at least one double-acting cylinder ( 60 ).
20. Device ( 2 ) according to claim 2 , characterized in that the second centering device ( 32 ) for centering the respective hard material element ( 4 ) before the welding comprises a second gripper arrangement ( 52 ) having second gripper jaws ( 54 a , 54 b ) configured to move toward or away from one another transversely or obliquely to the feed direction ( 14 ).