SE519139C2 - Method of forming holes or cavities in sintered and machined metal objects - Google Patents
Method of forming holes or cavities in sintered and machined metal objectsInfo
- Publication number
- SE519139C2 SE519139C2 SE9801633A SE9801633A SE519139C2 SE 519139 C2 SE519139 C2 SE 519139C2 SE 9801633 A SE9801633 A SE 9801633A SE 9801633 A SE9801633 A SE 9801633A SE 519139 C2 SE519139 C2 SE 519139C2
- Authority
- SE
- Sweden
- Prior art keywords
- core
- pressing
- brittle
- crushed
- plastic deformation
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
- B22F2005/103—Cavity made by removal of insert
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
Description
519 139 z stålstång e.d., utföra den plastiska bearbetningen och därefter borra ur den relativt mjuka stålstången. Metoden blir dock relativt komplicerad och dyrbar. 519 139 z steel bar or similar, perform the plastic machining and then drill out the relatively soft steel bar. However, the method becomes relatively complicated and expensive.
Om häl med komplicerad form skall åstadkommas måste vanligen pressning och sintring av konstuktionsdetaljen ske med konstruktionen uppdelad i två eller flera delar, där håligheten formas vid pressningen. Därefter sker en hopfogning av de sintrade delarna genom svetsning, lödning eller dylikt. Även denna metod blir komplicerad och dyrbar. Dessutom innebär hopfogningen i sig icke sällan problem.If heels with a complicated shape are to be produced, pressing and sintering of the construction part must usually take place with the construction divided into two or more parts, where the cavity is formed during the pressing. Thereafter, the sintered parts are joined together by welding, soldering or the like. This method also becomes complicated and expensive. In addition, the joining itself often involves problems.
REDOGÖRELSE FÖR UPPFINNINGEN Uppfinningen avser att åstadkomma en hålighet i den sintrade kroppen genom att använda en spröd kärna exempelvis av glas eller porös keram, som genom lämplig form av plastisk bearbetning eller pressning krossas. Den krossade kärnan kan därefter enkelt avlägsnas och efterlämnar därigenom den önskade håligheten i sinterkroppen.DISCLOSURE OF THE INVENTION The invention intends to create a cavity in the sintered body by using a brittle core, for example of glass or porous ceramic, which is crushed by a suitable form of plastic processing or pressing. The crushed core can then be easily removed, thereby leaving the desired cavity in the sintered body.
Principen för metoden (Pig. 1) består i att i den här visade cylindriska kroppen av sintermetall (1) vid pulverpressningen införa en kärna (Z) av sprött material av sådant slag att det ej formförändras nämnvärt under sintringen. Efter pulverpressningen utföres sintring av pulverkroppen enligt för materialet konven- tionell rutin. Vid en efterföljande plastisk bearbetning krossas den spröda kärnan. Alternativt kan en spröd, porös kärna ansvändas, vilken krossas vid en efterföljande pressning. Den krossade, pulverformiga kärnan kan nu enkelt avlägsnas, vanligen hällas ut.The principle of the method (Fig. 1) consists in inserting into the cylindrical body of sinter metal (1) shown here in the powder pressing a core (Z) of brittle material of such a kind that it does not change appreciably during sintering. After the powder pressing, sintering of the powder body is performed according to the routine conventional for the material. During a subsequent plastic processing, the brittle core is crushed. Alternatively, a brittle, porous core may be used, which is crushed upon subsequent pressing. The crushed, powdered core can now be easily removed, usually poured out.
Principen för metoden då en hålighet av mer komplicerad form (Pig. 2) skall åstadkommas består i att i kroppen av sintermetall (1) införa den spröda kärnan med en icke enkel geometrisk form (2).The principle of the method when a cavity of more complicated shape (Pig. 2) is to be achieved consists in inserting into the body of sintered metal (1) the brittle core with a not simple geometric shape (2).
Efter sintring och plastisk bearbetning eller pressning kan den krossade kärnan avlägsnas, vanligen hällas ut.After sintering and plastic processing or pressing, the crushed core can be removed, usually poured out.
FIGURBESKRIVNING.DESCRIPTION OF FIGURES.
Pig. 1 visar en sinterkropp (1) i vilken införts en cylindrisk kropp (2) av ett sprött material.Pig. 1 shows a sintered body (1) into which a cylindrical body (2) of a brittle material is inserted.
Pig. 2 visar en sinterkropp (1) i vilken införts en oregelbunden kropp (2) av ett sprött material. 519 139 3 o n | a | ao FÖREDRAGEN UTFÖRINGSFORM.Pig. 2 shows a sintered body (1) into which an irregular body (2) of a brittle material is inserted. 519 139 3 o n | a | ao PREFERRED EMBODIMENT.
Kärnan av sprött material kan införas pä skilda sätt. Normalt är det fördelaktigt att införa kärnan i samband med pressning av pulvret till en s.k. grönkropp. Alternativt kan kärnan införas i ett häl urborrat ur den pressade grönkroppen. Därefter sker sintring.The core of brittle material can be introduced in different ways. Normally, it is advantageous to introduce the core in connection with pressing the powder into a so-called green body. Alternatively, the core can be inserted into a heel drilled out of the pressed green body. Then sintering takes place.
Materialet i kärna mäste klara sintringstemperaturen utan stor formförändring och fär ej reagera med sintermetallen. Ytterligare ett alternativ är att, efter sintring, införa kärnan i ett häl urborrat ur den sintrade metallen. Därefter vidtar plastisk bearbetning säsom hamring eller smidning. Alternativt kan, om en porös kärna utnyttjas, pressning exempelvis isostatpressning utnyttjas.The material in the core must be able to withstand the sintering temperature without major deformation and must not react with the sintered metal. Another alternative is to, after sintering, insert the core into a heel drilled from the sintered metal. Then plastic processing such as hammering or forging takes place. Alternatively, if a porous core is used, pressing, for example, isostat pressing can be used.
Materialet i kärnan kan vara glas eller nägon form av keramik. För material med mättlig sintringstemperatur kan vanligt sodaglas utnyttjas medan för högre sintringstemperatur kvartsglas bör användas. Av keramer kan nämnas porslin och aluminiumoxid, som gärna bör vara porösa för att lättare krossas vid beabetningen.The material in the core can be glass or some form of ceramic. For materials with a moderate sintering temperature, ordinary soda glass can be used, while for higher sintering temperatures, quartz glass should be used. Ceramics include porcelain and alumina, which should preferably be porous to be more easily crushed during processing.
Detta är särskillt fallet om en pressningasoperation används för att krossa kärnan.This is especially the case if a pressing operation is used to crush the core.
Försök att tillämpa patentet vid tillverkning av pansarbrytande projektiler har utförts. I en stäng av en volfram-nickel-järn legering infördes i centrum en stav av kvartsglas, vilken efter plastisk bearbetning (hamring) var krossad och enkelt kunde avlägsnas, hällas ut. Härefter infördes en härd kärna i projektil- ämnet. (jämför svenskt patent nr 465 843).Attempts to apply the patent in the manufacture of armor-piercing projectiles have been made. In a rod of a tungsten-nickel-iron alloy, a rod of quartz glass was inserted in the center, which after plastic processing (hammering) was crushed and could be easily removed, poured out. Thereafter, a core was introduced into the projectile subject. (compare Swedish Patent No. 465,843).
Claims (4)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9801633A SE519139C2 (en) | 1998-05-12 | 1998-05-12 | Method of forming holes or cavities in sintered and machined metal objects |
PCT/SE1999/000673 WO1999058273A1 (en) | 1998-05-12 | 1999-04-27 | A method to produce holes in sinter metals, especially long or irregular holes in worked materials |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9801633A SE519139C2 (en) | 1998-05-12 | 1998-05-12 | Method of forming holes or cavities in sintered and machined metal objects |
Publications (3)
Publication Number | Publication Date |
---|---|
SE9801633D0 SE9801633D0 (en) | 1998-05-12 |
SE9801633L SE9801633L (en) | 1999-11-13 |
SE519139C2 true SE519139C2 (en) | 2003-01-21 |
Family
ID=20411252
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE9801633A SE519139C2 (en) | 1998-05-12 | 1998-05-12 | Method of forming holes or cavities in sintered and machined metal objects |
Country Status (2)
Country | Link |
---|---|
SE (1) | SE519139C2 (en) |
WO (1) | WO1999058273A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0805250D0 (en) * | 2008-03-20 | 2008-04-30 | Advanced Interactive Materials | Stator for use in helicoidal motor |
GB0805242D0 (en) * | 2008-03-20 | 2008-04-30 | Advanced Interactive Materials | Net-shape or near net-shape powder isostatic pressing process |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE143762C1 (en) * | ||||
US4777710A (en) * | 1987-04-23 | 1988-10-18 | Polymet Corporation | Apparatus and method used in making wire and similar elongate members and wire made using same |
SE470521B (en) * | 1992-11-16 | 1994-07-04 | Erasteel Kloster Ab | Method of powder metallurgical preparation of a body |
WO1995032819A1 (en) * | 1994-05-30 | 1995-12-07 | Anval Nyby Powder Ab | Manufacturing of high alloy wire |
-
1998
- 1998-05-12 SE SE9801633A patent/SE519139C2/en not_active IP Right Cessation
-
1999
- 1999-04-27 WO PCT/SE1999/000673 patent/WO1999058273A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
SE9801633D0 (en) | 1998-05-12 |
SE9801633L (en) | 1999-11-13 |
WO1999058273A1 (en) | 1999-11-18 |
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Legal Events
Date | Code | Title | Description |
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NUG | Patent has lapsed |