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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.

Inactive Publication Date: 2012-11-28
SIEBER FORMING SOLUTIONS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both thermal and mechanical post-treatments require an additional quality check step

Method used

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  • Method and device for producing elongated metal components having helical grooves, especially twist drills or endless screws
  • Method and device for producing elongated metal components having helical grooves, especially twist drills or endless screws
  • Method and device for producing elongated metal components having helical grooves, especially twist drills or endless screws

Examples

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Embodiment Construction

[0077] figure 1 The three steps A, B and C of the method according to the invention for producing an auger bit 2 from a blank 1 using a three-part split mold 3 are shown in a simplified manner. The three steps A, B and C constitute phase III of cold forming of the helical flutes 8 of the drill 2 . The blank 1 comprises a portion constituting the shank 11 and a portion 19 to be formed into a helical groove. The handle 1 can be designed, for example, as a cylindrical rod.

[0078] For the manufacture of the drill, a single die can be utilized, or the manufacturing process is done in a multi-stage punch press, where the blank 1 is also preformed from wire segments cut to specific lengths.

[0079] The multi-stage punching press, not shown in detail, comprises, in a structure known per se, a base frame with a movable carrier equipped with a die support unit. Furthermore, a shearing device, at least one extrusion or stamping die and a split die 3 are provided.

[0080] For stam...

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Abstract

The invention relates to a method for producing elongated metal components having helical grooves, especially twist drills or endless screws, and to a device suitable for carrying out said method. The aim of the invention is to devise an alternative method for producing elongated metal components having helical grooves, especially twist drills or endless screws, which method is suitable for large-scale production and characterized by an improved profitability. The method according to the invention comprises at least one cold-forming step III wherein the blank (1) is introduced into a guide matrix (9) and is then cold-formed in a split die (3) having at least two mobile die segments (4, 5, 6). The inner walls of the die segments have at least one section having a contour (7) that is designed as a negative for forming helical grooves (8).; A male die (13) which is axially mobile and which acts upon the free end of the blank (1) present in the guide matrix (9) presses the blank (1) to at least some extent through the center opening (17) of the closed split die (3), helical grooves (8) being produced during the contact with the die contour (7) under the effect of plastic cold-forming.

Description

technical field [0001] The invention relates to a method of manufacturing a helically fluted metal longitudinal element, in particular an auger bit or screw, and a device for carrying out the method. Background technique [0002] Drill bits of common design comprise at least two cutting edges at their head end for removing chips or drill dust (stone, concrete) of the material being processed. In order to discharge chips or drilling dust, the drill bit has helical grooves through which the chips or drilling dust are conveyed in the direction opposite to the feed direction. At the rear end of the drill bit there is a cylindrical or polygonal or specially shaped shank for clamping into a fixture such as a drilling machine or a drilling hammer. [0003] Drills, such as screw or helical drills, are manufactured in a manner known per se from solid material, preferably steel, in which the helical flutes are produced by metal cutting or deformation processes such as rolling or cold...

Claims

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Application Information

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IPC IPC(8): B21C23/14B21J5/02B23P15/32B21K5/02
CPCB21K5/02B21C23/147B21J5/02B23P15/32B21C23/14
Inventor 希尔马·金瑟特
Owner SIEBER FORMING SOLUTIONS
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