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Net-shape or near net-shape powder isostatic pressing process

A near-net-shape, net-shape technology, applied in the field of net-shape or near-net-shape powder isostatic pressing, can solve problems such as difficulties

Inactive Publication Date: 2011-04-20
ADVANCED INTERACTIVE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] These parts can be manufactured by hot isostatic pressing (HIP), but it is very difficult to machine the bore in the finished product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example

[0018] The present invention may be used to provide one or more holes in a helical projection provided in a stator body of a helical positive displacement pump, the length of the stator body being about 2 meters or more. Such stator bodies may be used to form the radial exterior of linear motors and / or mud pumps used in downhole boreholes. One or more holes are provided along the center of a helical groove having a pitch of about 1 meter and a radius of 50 mm about the axis of the stator body. The helical projections are defined by a plurality of helical grooves in the mandrel that is positioned within the mold during pressing of the stator body.

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PUM

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Abstract

A method of producing a net or near net-shape component from metal powder comprises producing an insert of accurate dimensions corresponding to the dimensions of a bore to be created in the finished component, the bore having a length of at least 750mm, supporting the insert within a mould cavity, filling the mould cavity with metal powder, subjecting the powder to isostatic pressing, and subsequently removing the material of the insert. The mould can be an independent mould that is removed after an initial step to bind the powder together into a pre-form, and the pre-form is then encapsulated in a suitable containment, such as a canister or a sprayed coating. The insert can be a metallic insert of a material, such as copper, that is subsequently removable by chemical etching. The insert can be coated with a material that is amenable to removal by etching, and to enable the insert to be extracted. A metallic insert can be coated with a material that provides a diffusion barrier to prevent the material of the insert from diffusing by atomic diffusion into the powder being consolidated during HIPing.

Description

technical field [0001] The present invention relates to net-shape or near-net-shape powder isostatic pressing techniques applied to metal and / or cermet / MMC (metal matrix composite) powders. [0002] The invention relates particularly, but not exclusively, to the formation of relatively long bores, especially longer than 750 mm, in components made of hard wear-resistant material. Background technique [0003] Such parts can be produced by hot isostatic pressing (HIP), but it is very difficult to machine bores into the finished product. Straight holes as short as 10 mm can be machined with difficulty. [0004] The inventors of the present invention consider that in some cases it is advantageous to provide an internal bore of precisely dimensioned length extending in the longitudinal direction of a part of about 2 meters long, which is preferably manufactured from powder by hot isostatic pressing, Thereby providing wear resistance. Contents of the invention [0005] Accord...

Claims

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Application Information

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IPC IPC(8): B22F5/10
CPCB22F5/10Y10T428/12361
Inventor G·F·阿彻
Owner ADVANCED INTERACTIVE MATERIALS
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