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Split Mandrel

IP.com Disclosure Number: IPCOM000244328D
Publication Date: 2015-Dec-02
Document File: 5 page(s) / 2M

Publishing Venue

The IP.com Prior Art Database

Related People

Victor Rimbau Gilabert: AUTHOR

Abstract

A new split mandrel design used in cold isostatic pressing (CIP) for powder metallurgy has been developed which has segments which can be extracted by first radial movement followed by axial movement. This design allows pressing thin walled cylindrical parts with complex inner profiles that means that powder consumption and additional processing is reduced, therefore reducing costs.

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Spit Mandrel

Victor Rimbau Gilabert

Abstract

A new split mandrel design used in cold isostatic pressing (CIP) for powder metallurgy has been developed which has segments which can be extracted by first radial movement followed by axial movement. This design allows pressing thin walled cylindrical parts with complex inner profiles that means that powder consumption and additional processing is reduced, therefore reducing costs.

Introduction

The standard cylindrical shaft used on normal cold isostatic press (CIP) operation consumes high amounts of ready to press (RTP) powder within the inner profile of the part to press. This amount of RTP is wasted because it must be machined in the green state after CIP. Therefore it would be beneficial to develop a pressing system which presses nearer to net shape whereby the core of material does not need to be machined away.

Description

Normally in CIP internal molds do not allow pressing hollow shapes inside of the punches.

A new split mandrel has been designed to substitute the standard cylindrical shaft used for normal CIP operation. The split mandrel is made of steel parts (segments and cylindrical core of diameter D1) designed to permit the pressing but is split so that it can later be disassembled. Thereby this design allows the creation of a hollow core in the pressed powder with an inner profile diameter D2 that can be bigger than the lateral journals of the part pressed (D3 & D4).

               
     

Segments

 
   
       

Cylindrical core

 
 
 
 
 

Figure 1: Net part to press on CIP with hollow

The split mandrel design is shown in figure 2. The mandrel is disassembled in a number of operations. The first operation is to remove the cylindrical core of the split mandrel. This operation creates free space to allow the segments of the split mandrel to be extracted in two movements: first radially and then axially.

Figure 2: Split mandrel design

In order to allow split mandrel extraction, segments present following geometry:

1.    At least one of the segments is cut following an angle...