Method and device for producing elongated metal components having helical grooves, especially twist drills or endless screws
A technology of auger bit and helical groove is applied in the manufacture of auger bit or screw, and the field of the device for implementing the method can achieve high cost performance.
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[0077] figure 1 The three steps A, B, and C of the method for manufacturing the spiral drill bit 2 from the blank 1 using the three-part combined mold 3 according to the present invention are shown in a simplified manner. The three steps A, B and C constitute the cold forming stage III of the spiral groove 8 of the forming bit 2. The blank 1 includes a part constituting the shank 11 and a part 19 to be formed into a spiral groove. The shank 1 can be designed as a cylindrical rod, for example.
[0078] In order to manufacture the drill bit, a single die can be used, or the manufacturing process can be completed in a multi-stage punching machine, in which the preformed blank 1 is also cut from wire segments of a specific length.
[0079] A multi-stage punch, not shown in detail, in a structure known per se, includes a base frame with a movable carrier equipped with a mold support unit. Moreover, a shearing device, at least one punching or punching die and a combined die 3 are provi...
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