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A method for producing screws, and the screws thereby

A screw and ultra-high-strength technology, applied in the field of screw manufacturing, can solve the problems of high cost and high consumption, and achieve the effect of avoiding weak parts and good strength characteristics

Inactive Publication Date: 2009-03-04
SFS INTEC HLDG AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The production of such a screw is associated with great effort and thus also high costs

Method used

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  • A method for producing screws, and the screws thereby
  • A method for producing screws, and the screws thereby

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Embodiment Construction

[0012] The drawing shows an exemplary embodiment of a screw, as it is used to fasten indexable inserts. Of course, the measures according to the invention for screws can be applied in the same way in other fields. Precisely for such screws, which have to be produced with close tolerances and are mainly subjected to torque and tensile forces, it has been shown that screws produced by cold pressing are clearly superior to screws produced by machining. However, since screws made precisely of ultra-high-strength steel are the best raw material for such screws, they have so far been produced as turned parts, because experts skilled in the art believe that the method of cold pressing Manufacturing is impossible for finishing.

[0013] A screw 1 shown in the drawing, in particular for fastening indexable inserts, has a screw head 2 and a threaded shaft 4 provided with a thread 5 . A flight 5 having an outer diameter D1 is wound around the screw 4 having a diameter D. The screw hea...

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Abstract

A screw (1) comprising a screw head (2), a screw rod (4) provided with a thread (5) and an inner joint (3), said screw being manufactured by cold pressing of raw materials by a special method , which uses ultra-high-strength steel as the raw material.

Description

technical field [0001] The invention relates to a method for producing a screw, in particular a screw for an indexable insert with an inner joint, and to a screw. Background technique [0002] It is known per se to produce screws in various variants by cold pressing of raw materials. The problem is first of all on the high-strength raw materials. The reason here so far has been that only cutting, ie material-removing machining is possible. The production of such a screw is associated with great effort and thus also high costs. Those skilled in the art still consider, as before, that starting from a certain strength of the raw material, it is not possible to produce screws with inner joints, and here in particular relatively small screws, by means of the cold forming method. Contents of the invention [0003] The object of the present invention is to overcome the prejudices of this specialized field and to provide the possibility of producing screws with internal joints ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D7/02C22C38/08C22C38/10C21D9/00C22C38/06C22C38/12C22C38/14
CPCC22C38/14C21D9/0093C22C38/06C21D7/02C22C38/105C22C38/12B21K1/46
Inventor T·马茨勒E·罗纳
Owner SFS INTEC HLDG AG
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