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Method and device for producing sintered metal blank with interior helical recesses

A sintered metal and pore technology, applied in the field of sintered metal blanks, can solve the problems of high mechanical adjustment costs, long refitting and adjustment time of extrusion tools, etc., and achieve the effect of less refitting costs

Inactive Publication Date: 2004-01-07
ARNO FRIEDRICHS HARTMETALL GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This has the result that long retooling and adjustment times are required for extrusion tools, as a result of which the conventional method is economically used primarily for mass production
Disproportionately high mechanical adjustment costs for small batch production or for the manufacture of drilling tools with larger nominal diameters raise questions about the economics of this manufacturing method

Method used

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  • Method and device for producing sintered metal blank with interior helical recesses
  • Method and device for producing sintered metal blank with interior helical recesses
  • Method and device for producing sintered metal blank with interior helical recesses

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Embodiment Construction

[0034] Reference numeral 10 in FIGS. 1 to 3 designates a sintered metal blank cut to a predetermined length L*, ie cut to length, which consists, for example, of a cemented carbide powder with admixed binder or adhesive. The sintered metal blank is produced, for example, by extrusion and has a straight and continuous internal aperture 12, indicated by a dotted line in the figure, which is parallel to the central axis 14 of the cylindrical blank 10. extend.

[0035] The production of the sintered metal blank is preferably carried out by extrusion using an extrusion nozzle with a suitable core. The blank 10 has a relatively soft hardness and must therefore be handled, eg conveyed, very carefully in order to prevent irreversible deformations. It is therefore preferred to direct the blanks after exiting the extrusion nozzle directly onto an air cushion and to convey them onto the bottom cushion 16 shown in the figures, which coincides with the plane of the illustration in FIGS. 1 a...

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PUM

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Abstract

The invention relates to a method for producing a substantially regular cylindrical body that consists of a deformable material, especially a sintered metal blank. Said blank is provided with an interior helical recess. The blank is first produced with a substantially linear course of the interior recess, for example by extrusion. The body is cut to a defined length and is subjected to a rolling movement by means of a friction surface while being supported across its entire length on a support. The speed of said rolling movement changes in a linear and continuous manner across the length of the body, thereby regularly twisting the body.

Description

technical field [0001] The invention relates to a method and a device for producing a substantially cylindrical body of plastics material, in particular a sintered metal blank, having at least one helical internal aperture extending inside it. Furthermore, the invention relates to a sintered rod produced by the method according to the invention. Background technique [0002] Such bodies are required in particular when producing drilling tools or drilling tool inserts made of cemented carbide or ceramic material. By means of the helical extension of at least one inner hole, it is possible to provide the drilling tool with helical chip flutes, which are often advantageous and therefore sought for good cutting performance and chip evacuation, wherein the inner hole is produced Used in finished drilling tools to deliver coolant or lubricant to the cutting zone. [0003] Attempts have been made for a long time to produce such sintered metal blanks or ceramic blanks by extrusion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C23/01B21C23/00B21K5/04B22F3/02B22F3/20B22F5/10B23B51/06B23P15/32
CPCB22F5/10B22F2005/004B22F2998/10B23B51/06B22F2005/001B21K5/04B23P15/32B22F3/20B22F3/18B22F3/10
Inventor 阿尔诺·弗里德里克斯
Owner ARNO FRIEDRICHS HARTMETALL GMBH & CO KG