METHOD FOR MANUFACTURING A DOOR FRAME, WELDING ARRANGEMENT AND STRUCTURE OF A DOOR FRAME

• US 20120102857A1
• Filed: 05/04/2010
• Published: 05/03/2012
• Est. Priority Date: 05/04/2009
• Status: Active Grant

• Current Assignee: Pemamek Oy
• Original Assignee: Pemamek Oy
• Inventors: Savolainen, Mikko, Tynkkynen, Timo
• Granted Patent: US 9,427,827 B2
• Time in Patent Office: Days
• US Class Current: 52/204.1
• CPC Class Codes: B23K 28/02 Combined welding or cutting procedures or apparatus
• CPC Class Codes: B23K 37/0229 the guide member being situated alongside the workpiece
• CPC Class Codes: E04H 12/003 Access covers or locks therefor

Abstract

Manufacturing method, welding arrangement and door frame structure for a door frame (21) of a windmill tower (10), wherein a hole (15) is made in the tower shell (10) for the door and a door frame is placed in the hole and welded on the shell. In the method, the shape of the door frame for the shell and the shape of the surface of the shell at the opening (15) to be made are measured with a measuring sensor (40). Based on the measurements, a cutting torch (41) is controlled so that an opening corresponding to the shape of the door frame is cut in the shell and bevels (16, 17) are cut in the edge of the opening on both sides. The door frame is welded on the shell with a weld (24), such as a double bevel, double J or square butt weld, from the inside and the outside of the shell.

Claims

1. Door frame (21) manufacturing method, according to which method a hole (15) is made for a door in a tubular shell (11), such as a windmill tower (10), and said door frame (21) is placed in said hole and welded on the shell, characterised in that

the shape of said door frame (21) for said tubular shell (11) and the shape of the surface of said tubular shell at said opening (15) to be made in the shell are measured with a measuring sensor (40), and

a cutting device (41) is controlled, based on the measurements, so that an opening (15) corresponding to the shape of said door frame (21) is cut in the shell (11) with said cutting device, such as a cutting torch.

2. Manufacturing method according to claim 1, characterised in that said cutting device (41) is controlled based on measurements carried out with said measuring sensor (40) to make a bevel (16, 17) in the edge of the cut-out opening (15).

3. Manufacturing method according to claim 1 or 2, characterised in that said bevels (16, 17) are made in the edge of the cut-out opening (15) on both sides of the opening.

4. Manufacturing method according to claim 1 or 2, characterised in that said door frame (21) is welded on said tubular shell (11) with a double bevel weld, asymmetric double V butt weld, double J or square butt weld from the inside and the outside of said shell.

5. Manufacturing method according to claim 1 or 2, characterised in that the measurement data of the 3D measuring sensor (40) is utilised for the real time monitoring and control of the welding process.

6. Welding arrangement for a door frame for a tubular shell (11), such as a windmill tower (10), characterised in that said welding arrangement comprises a measuring sensor (40) for measuring the shape of a door frame (21) and the shape of the surface of said tubular shell (11), a computer system for determining the cutting path for a shell opening (15) and the welding path between said door frame and the shell.

7. Welding arrangement according to claim 6, characterised in that said welding arrangement comprises a computer system to determine the angle of said bevel (16, 17) of said opening (15) of said shell (11) so that the amount of filler metal in a weld (24), such as a double bevel, double J or square butt weld, between said shell and said door frame is essentially constant.

8. Welding arrangement according to claim 6 or 7, characterised in that a welding device (42) connected to a robot (30) is used for welding together with a 3D measuring sensor (40) connected to said robot so that the measurement data of the measuring sensor can be utilised in real-time monitoring and control of the welding process.

9. Door frame (21) structure for a tubular shell (11), such a windmill tower (10), characterised in that in a weld (24) between the shell (11) and a door frame (21), the angle of the groove bevel (16, 17) has been adjusted based both on the shape of said door frame and the shape of the surface of said tubular shell of said tower.

10. Door frame (21) structure according to claim 9, characterised in that in said weld (24), such as a double bevel, double J or square butt weld, between said tubular shell (11) and said door frame (21), the angle of said groove bevel (16, 17) has been adjusted so that the amount of filler metal is essentially constant.