Method for positioning a welding bolt and bolt welding head
AssigneeNelson Bolzenschweiss-Technik GmbH & Co. KG
InventorsUlrich Citrich, Steffen Hailer, Jurgen Madsak
Life of this patent
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Abstract
The invention relates to a method for positioning a welding bolt (15), held in a bolt welding head (3), whereby the robot (5), to which the bolt welding head (3) is fixed, moves the bolt welding head sideways until a touch sensor (21) contacts a side wall (25) of a workpiece. The position of the side wall (25) is thus detected and the bolt welding head (3) can be moved through a set amount (Y) into a welding start position, from whence the welding bolt (15) can be welded to the workpiece (9) by the displacement in the direction of travel (V). The welding bolt (15), thus, always has the required separation (Z) from the side wall (25), independent of tolerances in the workpiece.
Claims14
A process for positioning a welding bolt (15) that is mounted in a bolt welding head (3) whereby the bolt welding head (3) is designed for a programmable multi-axel operating mechanism and whereby the welding bolt (15) is delivered during welding in a feed direction (V) to a workpiece (9) on which the bolt is being welded, characterized by the following steps:
- a) the bolt welding head (3) is brought to the workpiece (9) by the operating mechanism (5);
- b) the operating mechanism (5) moves the bolt welding head diagonal to the feed direction (V), in which the welding bolt (15) will be moved during later welding, until a contact recognition device designed (23) for the bolt welding head (3) contacts a side surface of the workpiece (9);
- c) the operating mechanism (5) moves the bolt welding head (3) diagonal to the feed position (V) by a specific Should-measurement (Y) into a welding start position;
- and
- d) the welding bolt will be moved in the feed direction (V) to the workpiece surface until contact is made.
Process described in one of the preceding claims, characterized by the fact that in step b) the operating mechanism (5) moves the bolt welding head (3) in a first direction (B1) sideways to a side surface of the workpiece (9) whereby the contact recognition device (23) signals contact with the workpiece and whereby this first position upon contact with the workpiece is recorded and saved, tat the bolt welding head (3) is moved in a second direction (B2) set opposite to the first direction until it reaches a second position at which the contact recognition device (23) no longer signals contact with the workpiece whereby this section position is recorded and saved and that a reference value from the first and section position is determined from which the bolt welding head (2) will be moved sideways into the welding start position by the predetermined nominal value (Y).
Process described in one of the preceding claims, characterized by the fact that in step d) the bolt welding head (3) moves the welding bolt (15).
Process described in one of the preceding claims, characterized by the fact that a contact recognition device (23), which in step d) indicates contact with the workpiece during movement in the feed direction (V), is used to indicate contact with the workpiece in step b).
Bolt welding head, especially for implementation of the processing described on one of the preceding claims, with a welding axel (11) that may be moved in an axial direction, welding bolt retainer (13) that is connected to the welding axel (11), and a contact recognition device (23) that determines contact between the welding bolt (15) and the workpiece (9) upon movement of the welding axel (11) in a feed direction (9), characterized by the fact that a contact recognition device (23) is used that determines the presence of a side surface of the workpiece during movement of the bolt welding head (3) diagonal to the feed direction.
Dependencies are inferred from the claim text.