Tool

1. A tool, comprising:

a saw blade composed of a bimetallic strip, the saw blade including:

at least one main body, and

at least one working part connected integrally to the main body along a straight connecting edge, the working part having at least one working edge having a set of saw teeth; and

a fastening part configured to center the tool for oscillation about a rotation axis, the main body fastened to the fastening part in an overlapping manner,

wherein the working edge is defined by a shortest, continuously-curved connecting line touching each tooth tip of the set of saw teeth, the connecting line having a curvature that differs in degree along a length of the working edge, and

wherein the bimetallic strip defines a first straight edge of the main body, the first straight edge oriented at least substantially parallel to the straight connecting edge and facing toward the rotation axis.

2. The tool as claimed in claim 1 , wherein a first portion of the bimetallic strip defines the main body and a second portion of the bimetallic strip defines the working part.

3. The tool as claimed in claim 2 , wherein the bimetallic strip is configured to have an intermediate processing state in which the bimetallic strip defines a second straight edge of the working part that is at least substantially parallel to the straight connecting edge, the first and second straight edges each spaced apart from the straight connecting edge.

4. The tool as claimed in claim 1 , wherein a height of the at least one working part is greater than a height of the set of saw teeth.

5. The tool as claimed in claim 1 , wherein the main body is fastened to the fastening part by a spot-welded connection.

6. The tool as claimed in claim 1 , wherein the fastening part defines a centering opening and a form closure mechanism that is spaced from and encircles the centering opening, wherein the centering opening is configured to center the tool about the rotation axis but not to transfer torque from the tool, and wherein the form closure mechanism is configured to transmit torque from the tool and to define a rotary position of the saw blade relative to the tool.

7. The tool as claimed in claim 1 , wherein the bimetallic strip includes two different metal or metal alloy materials that are materially bonded together along the straight connecting edge.

8. The tool as claimed in claim 1 , wherein the working edge is symmetrical in form with respect to a mid-perpendicular of the working edge.

9. The tool as claimed in claim 1 , wherein the connecting line has a shape that approximates a parabola.

10. The tool as claimed in claim 1 , wherein a portion of the length of the working edge substantially defines a circle segment the center of which is located substantially on a rotation axis of an oscillating sawing motion.

11. A method for producing a tool, comprising:

parting off a bimetallic strip from a bimetallic band to form a saw blade of the tool, the bimetallic band having a first portion and a second portion connected integrally to the first portion along a straight connecting edge such that, when the bimetallic strip is parted off, the first portion defines at least one main body of the saw blade and the second portion defines at least one working part of the saw blade; and

forming a set of saw teeth in at least one working edge of the working part, the working edge defined by a shortest, continuously-curved connecting line touching each tooth tip of the set of saw teeth, the connecting line having a curvature that differs in degree along a length of the working edge.

12. The method as claimed in claim 11 , wherein the at least one working edge is produced when the set of saw teeth is produced.

13. The method as claimed in claim 11 , wherein the working edge is symmetrical in form with respect to a mid-perpendicular of the working edge.

14. The method as claimed in claim 11 , wherein the length of the working edge defines a circle segment the center of which is located substantially on a rotation axis of an oscillating sawing motion.

15. The method as claimed in claim 11 , the method further comprising fastening the main body to a fastening part of the tool in an overlapping manner.

16. The method as claimed in claim 15 , wherein the first portion of the bimetallic strip defines a second straight edge of the main body, the second straight edge oriented substantially parallel to the straight connecting edge and spaced apart from the straight connecting edge.

17. The method as claimed in claim 16 , wherein the fastening part is configured to center the tool for oscillation about a rotation axis, and wherein the second straight edge faces toward the rotation axis after the main body is fastened to the fastening part.

18. The method as claimed claim 16 , wherein the straight connecting edge and the second straight edge extend in a direction corresponding to a longitudinal direction of the bimetallic band prior to the parting off of the bimetallic strip.

19. The method as claimed in claim 11 , wherein the bimetallic strip is parted off substantially transversely in relation to the straight connecting edge.

20. The method as claimed in claim 11 , wherein the second portion of the bimetallic strip defines the working edge, and wherein, prior to forming the set of saw teeth, the working edge is a first straight edge that is oriented substantially parallel to the straight connecting edge and spaced apart from the straight connecting edge.