EP1717539A1 - Method of manufacturing a slide of a firearm - Google Patents

Method of manufacturing a slide of a firearm Download PDF

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Publication number
EP1717539A1
EP1717539A1 EP06008184A EP06008184A EP1717539A1 EP 1717539 A1 EP1717539 A1 EP 1717539A1 EP 06008184 A EP06008184 A EP 06008184A EP 06008184 A EP06008184 A EP 06008184A EP 1717539 A1 EP1717539 A1 EP 1717539A1
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EP
European Patent Office
Prior art keywords
green compact
green
sintering
slide
sprue
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP06008184A
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German (de)
French (fr)
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EP1717539B1 (en
Inventor
Wulf-Heinz Pflaumer
Daniel Rieger
Franz Wonisch
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Umarex GmbH and Co KG
Original Assignee
Umarex Sportwaffen GmbH and Co KG
Umarex GmbH and Co KG
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Application filed by Umarex Sportwaffen GmbH and Co KG, Umarex GmbH and Co KG filed Critical Umarex Sportwaffen GmbH and Co KG
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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
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
    • B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A3/00—Breech mechanisms, e.g. locks
    • F41A3/12—Bolt action, i.e. the main breech opening movement being parallel to the barrel axis
    • F41A3/36—Semi-rigid bolt locks, i.e. having locking elements movably mounted on the bolt or on the barrel or breech housing
    • 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
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • 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
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49885—Assembling or joining with coating before or during assembling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material

Definitions

  • the present invention relates to methods of making a closure carriage of a firearm.
  • the assembly also contains the firing pin, which causes the ignition of the cartridge, and various security systems.
  • Lateral guide slots in the closure slide allow a forward and backward movement and an opening and closing of the closure.
  • the opening can be done either manually by hand or semi-automatically on the ignited cartridge. The latter is typical of the self-loading principle.
  • the ignited cartridge opens the closure by the gas discharge taking place and the cartridge case is pulled out of the cartridge chamber by means of an extractor lever and catapulted out through the ejection window.
  • the spring-back-fasting, ie re-closing, slide carriage takes the next cartridge out of the magazine on its way and guides it to the chamber in the assembly run.
  • the shutter slide must therefore be able to absorb the sudden forces through the ignited cartridge.
  • the main requirements are tensile strength, toughness, hardness and a certain impact resistance.
  • the thermal loads are also very high at fast firing changes.
  • the area which is subjected to the heaviest load is referred to as the impact floor, since here the sleeve is supported during the ignition.
  • the problem underlying the present invention is the specification of a method of the type mentioned, which allows a cost-effective production of a closure slide.
  • Basis of the starting material are very fine powders. They usually have spherical particles to form the lowest possible resistance in the subsequent flow process in the tool. Usually, the particle size is less than 45 microns, but varies depending on the type of powder used.
  • For the actual production of the powder use is made of chemical processes or atomization with inert gases. Analogous to other powder metallurgical processes, it is also possible to use pure, alloyed, but also mixed powder as the starting material in the production of powders for metal powder injection molding. This opens up the possibility of using a relatively broad range of materials whose properties are largely quite different. The use of mixed powders with ceramic content or attached fiber materials is conceivable.
  • the subsequent process step is the mixing of the powder with the organic binder.
  • the aim here is to achieve a homogeneous mixing of all constituents in order to have homogeneous properties in the later component. This is particularly important in the debindering process and the subsequent sintering, as this can achieve a uniform shrinkage over the entire component.
  • the mixing ratio of powder and binder is usually around a ratio of 60 vol .-% to 40 vol .-%.
  • the aim is to fill in the spaces between the powder particles without increasing their distance from each other.
  • the binder wets the surface of the powder particles and destroys existing agglomerates formed by the use of very fine powders.
  • the entire process takes place at temperatures above the melting temperature of the binder and is usually carried out in mixers, kneaders or extruders.
  • the resulting homogeneous mass is referred to as a feedstock. It is finally processed into a pourable granulate, which simplifies transport and storage.
  • the granules also offer the possibility to use it in commercially available injection molding machines.
  • the molding of the feedstock takes place during metal injection molding by injection molding.
  • Commercially available injection molding machines are used, which are optionally equipped with wear-protected cylinder units.
  • the process is analogous to the injection molding of plastics.
  • Through the screw and an external tempering the plasticization of the feedstock takes place. Common pressures for pressing into the mold are between 500 and 2000 bar.
  • About ejector pins the component can be pressed out of the cavity and removed. The result is the green compact, which is very sensitive to distortion and can already be deformed by small forces until the final cooling. Careful handling is the top priority here.
  • the green body has a sprue bar corresponding to the sprue and one or more runner channels when it is removed from the injection mold.
  • the next step is debinding.
  • debinding thus one calls the process, with which the organic portion, thus the binder, from the
  • the individual organic substances are vaporized by a defined heating from the green compact.
  • the solvent debinder works with a solvent, such as acetone, which dissolves the organic components from the green compact.
  • An insoluble binder component further ensures the cohesion of the structure and evaporates during the subsequent sintering process.
  • the catalytic debinding works analogously to the solvent debinding, but the organic components are not dissolved, but decomposed catalytically into easily evaporable fractions. These then evaporate in the subsequent sintering process.
  • the intermediate product obtained after debindering is an extremely porous shaped body which is merely held together by a residual binder content of about ten percent of the original amount. These shaped bodies are also called brownlings.
  • the residual binder finally evaporates completely in the subsequent sintering process.
  • Modern conveyor systems can combine debindering and sintering so that a smooth transition between the two processes can occur.
  • the sintering process is the most know-how intensive of the entire metal powder injection molding process.
  • the Braunling is at temperatures below the melting point compacted the used alloy into a compact body. So there is a heat treatment with a solid phase. Any existing residual binder shares are also evaporated in this course.
  • the heat treatment is carried out in special high-temperature furnaces under a protective gas atmosphere or in a vacuum.
  • the resulting shrinkage process is dependent on the composition of the feedstock used and is usually between 10% and 20% based on the initial dimensions of the green or brown. The result is a component with a final density above 96% of the theoretical density.
  • the green compact is cooled slowly, in particular in a period of time between 10 and 25 minutes.
  • the slow cooling can prevent the formation of stresses in the green compact which could lead to cracks and distortions in the green body or later during sintering to cracks and distortions in the closure sled.
  • different parts of the green compact have the same or a temperature only so different that no cracks and / or distortions occur in the green body during cooling.
  • the uniform cooling can contribute to the prevention of cracks and distortion.
  • a continuous furnace large quantities of green compacts can be cooled simultaneously, so that the use of such a continuous furnace in series production is suitable.
  • the green compact is cooled in an oil bath or in contact with heated parts, in particular metal parts. Such a method may well be useful for small quantities.
  • the green compact can have a sprue bar and at least one sprue channel when removed from the injection mold.
  • the debindering is carried out as catalytic debinding, in particular in a nitrogen atmosphere with the addition of nitric acid.
  • the sprue bar and / or the at least one sprue remains until after the sintering of the brown compact on the closure sled to be manufactured.
  • the at least one runner substantially contributes to the stabilization of the green body or the brown, so that in the sintering Danger of cracks or unwanted deformations can be significantly reduced.
  • the sprue bar is removed prior to sintering the brownbody and inserted into a bore in the closure slide to be manufactured to serve as a support in this bore during sintering. Due to the fact that the sprue bar was made of the same material under the same conditions as the rest of the Braunling, it has the same shrinkage properties during the sintering process and can therefore be optimally used for support. At the same time, the sprue bar is used as a typical waste part.
  • a typical shutter slide 1 can be seen, which is produced by a method according to the invention.
  • the shutter slide 1 has, in a central region, an ejection window 2 through which the empty cartridge case is ejected during the movement of the closure slide 1 due to the firing of a shot.
  • the closure slide is provided in each case with different reference numerals 1, 3, 4 in FIGS. 1 to 4, because different stages of the production process are illustrated in the figures.
  • reference numeral 1 the finished sintered slide, with the reference numeral 2 of the green compact after spraying and designated by the reference numeral 3 Braunling before sintering.
  • the figures do not take into account that the closing slide shrinks during the transition from green to brown and to the final sintered product.
  • 100Cr6 is used as the raw material for spraying the greenware 3.
  • the green compact 3 is held on the sprue bar 5 (see FIGS. 2 and 3) and removed from the injection mold (not shown).
  • FIGS. 2 and 3 show these green bodies 3 taken from the injection mold. These illustrations show that two sprue channels 6 extend from the sprue bar 5 in the longitudinal direction of the green body 3 through the ejection window 2.
  • the green compact 3 is cooled in a continuous furnace from about 100 ° C to about room temperature over about 15 to 20 minutes.
  • the continuous furnace ensures a cooling of all parts of the green body 3 at about the same speed.
  • the green compact 3 After cooling, the green compact 3 is catalytically removed by treatment with nitric acid in a nitrogen atmosphere to a Braunling 4.
  • the sprue bar 5 can either be solved directly after spraying of the green body 3, for example, broken off, or be solved by the Braunling 4 after cooling or only after debindering.
  • closure slide 1 or the greenware 3 and the browning 4 have a bore 7 for receiving the firing pin of the firearm to be fitted with the closure slide 1. So that the bore 7 surrounding parts of the Braunlings 4 supported during sintering be, the broken sprue bar 5 is introduced into the bore 7.
  • the sprue channels 6 extending through the ejection window 2 in the longitudinal direction of the closure carriage 1 or of the brown body 4 are left on the Braunling 4 during the sintering in order to give it additional stability.
  • the sprue channels 6 are removed after completion of the sintering, for example by milling, so that the ejection window 2 is exposed.

Abstract

The method involves spraying of a green compact in an injection mold, and cooling of the green compact. The green compact is debindered to a grey compact, where the grey compact is sintered. The green compact is cooled down slowly in the time interval for ten minutes to twenty-five minutes. The green compact is cooled in an oil bath or in contact with a compact that is to be heated.

Description

Die vorliegende Erfindung betrifft Verfahren zur Herstellung eines Verschlussschlittens einer Schusswaffe.The present invention relates to methods of making a closure carriage of a firearm.

An den Verschluss werden die höchsten Anforderungen aller Bauteile einer Waffe gestellt. Neben dem Verschlussschlitten mit dem eigentlichen Verschlussstück beinhaltet die Baugruppe noch den Schlagbolzen, welcher die Zündung der Patrone bewirkt, und verschiedene Sicherungssysteme. Seitliche Führungsschlitze in dem Verschlussschlitten ermöglichen eine Vor- und Rückbewegung beziehungsweise ein Öffnen und Schließen des Verschlusses. Das Öffnen kann entweder manuell durch Handkraft oder halbautomatisch über die gezündete Patrone erfolgen. Letzteres ist typisch für das Selbstladeprinzip. Die gezündete Patrone öffnet durch die stattfindende Gasentladung den Verschluss und die Patronenhülse wird mit Hilfe eines Auszieherhebels aus dem Patronenlager gezogen und durch das Auswurffenster hinauskatapultiert. Der durch Federkraft zurückschnellende, also erneut schließende Verschlussschlitten nimmt auf seinem Weg die nächste Patrone aus dem Magazin mit und führt sie dem Patronenlager in der Baugruppe Lauf zu.At the closure the highest requirements of all components of a weapon are provided. In addition to the shutter slide with the actual closure piece, the assembly also contains the firing pin, which causes the ignition of the cartridge, and various security systems. Lateral guide slots in the closure slide allow a forward and backward movement and an opening and closing of the closure. The opening can be done either manually by hand or semi-automatically on the ignited cartridge. The latter is typical of the self-loading principle. The ignited cartridge opens the closure by the gas discharge taking place and the cartridge case is pulled out of the cartridge chamber by means of an extractor lever and catapulted out through the ejection window. The spring-back-fasting, ie re-closing, slide carriage takes the next cartridge out of the magazine on its way and guides it to the chamber in the assembly run.

Der Verschlussschlitten muss also in der Lage sein, die plötzlich auftretenden Kräfte durch die gezündete Patrone aufzunehmen. Gefordert sind in erster Linie Zugfestigkeit, Zähigkeit, Härte und eine gewisse Schlagunempfindlichkeit.The shutter slide must therefore be able to absorb the sudden forces through the ignited cartridge. The main requirements are tensile strength, toughness, hardness and a certain impact resistance.

Die thermischen Belastungen sind bei schnellen Schusswechseln ebenfalls sehr hoch. Der Bereich, welcher am stärksten belastet ist, wird als Stoßboden bezeichnet, da sich hier die Hülse bei der Zündung abstützt.The thermal loads are also very high at fast firing changes. The area which is subjected to the heaviest load is referred to as the impact floor, since here the sleeve is supported during the ignition.

Klassische Werkstoffe für Verschlussschlitten sind Kaltarbeitsstähle wie beispielsweise ein X19NiCrMo4, welcher zunächst vergütet und nachfolgend spanend bearbeitet wird. Diese Reihenfolge wird durch die komplexe Geometrie und die engen Toleranzen erzwungen. Verzüge als Folge der Wärmebehandlung sind in der Regel nicht zu kompensieren.Classic materials for shutter slides are cold work tools such as a X19NiCrMo4, which is first tempered and subsequently machined. This order is enforced by the complex geometry and tight tolerances. Distortions as a result of the heat treatment can not be compensated in the rule.

Das der vorliegenden Erfindung zugrunde liegende Problem ist die Angabe eines Verfahrens der eingangs genannten Art, das eine kostengünstige Herstellung eines Verschlussschlittens ermöglicht.The problem underlying the present invention is the specification of a method of the type mentioned, which allows a cost-effective production of a closure slide.

Dies wird erfindungsgemäß durch ein Verfahren der eingangs genannten Art mit den kennzeichnenden Merkmalen des Anspruchs 1 erreicht. Die Unteransprüche betreffen bevorzugte Ausgestaltungen der Erfindung.This is inventively achieved by a method of the type mentioned above with the characterizing features of claim 1. The subclaims relate to preferred embodiments of the invention.

Gemäß Anspruch 1 ist vorgesehen, dass der Verschlussschlitten durch ein Metallpulverspritzgussverfahren mit folgenden Verfahrensschritten hergestellt wird:

  • Spritzen eines Grünlings in einer Spritzgussform;
  • Abkühlen des Grünlings;
  • Entbinderung des Grünlings zu einem Braunling;
  • Sintern des Braunlings.
According to claim 1 it is provided that the closure slide is produced by a metal powder injection molding process with the following process steps:
  • Spraying a green compact in an injection mold;
  • Cooling the green body;
  • Debindering the greenling to a brownling;
  • Sintering the brownling.

Durch ein Metallpulverspritzgussverfahren lässt sich ein Verschlussschlitten kostengünstig herstellen. Im folgenden soll ein kurzer Überblick über das für die Herstellung anderer Teile bekannte Metallpulverspritzgussverfahren (MIM-Verfahren) als solches gegeben werden:

  • Der Metallpulverspritzguss ist prinzipiell eine Aneinanderreihung etablierter Fertigungsverfahren. Die einzelnen Prozesses hierbei sind:
    • Herstellen von Metallpulver;
    • Herstellen von Binder;
    • Mischen von Metallpulver und Binder;
    • Verbinden beider Komponenten zum Feedstock;
    • Formgebung durch Spritzguss;
    • Entfernen des Binders;
    • Sintern.
By a metal injection molding process, a closure slide can be produced inexpensively. The following is a brief overview of the metal powder injection molding process (MIM process) known for the production of other parts as such:
  • In principle, metal powder injection molding is a succession of established manufacturing processes. The individual processes here are:
    • Producing metal powder;
    • Making binders;
    • Mixing metal powder and binder;
    • Connecting both components to the feedstock;
    • Molding by injection molding;
    • Removing the binder;
    • Sintering.

Grundlage des Ausgangsmaterials bilden sehr feine Pulver. Sie besitzen zumeist sphärische Partikel um beim späteren Fließprozess im Werkzeug einen möglichst geringen Widerstand zu bilden. Üblicherweise liegt die Partikelgröße unter 45 µm, variiert jedoch je nach Art des eingesetzten Pulvers. Zur eigentlichen Herstellung des Pulvers nutzt man chemische Verfahren oder eine Verdüsung mit Inertgasen. Analog zu anderen pulvermetallurgischen Verfahren können auch bei der Herstellung von Pulvern für den Metallpulverspritzguss reine, legierte, aber auch Mischpulver als Ausgangsmaterial vorliegen. Dies eröffnet die Möglichkeit, eine relativ breite Werkstoffpalette zu nutzen, deren Eigenschaften größtenteils recht unterschiedlich sind. Auch der Einsatz von Mischpulvern mit keramischem Anteil oder beigefügten Fasermaterialien ist denkbar.Basis of the starting material are very fine powders. They usually have spherical particles to form the lowest possible resistance in the subsequent flow process in the tool. Usually, the particle size is less than 45 microns, but varies depending on the type of powder used. For the actual production of the powder, use is made of chemical processes or atomization with inert gases. Analogous to other powder metallurgical processes, it is also possible to use pure, alloyed, but also mixed powder as the starting material in the production of powders for metal powder injection molding. This opens up the possibility of using a relatively broad range of materials whose properties are largely quite different. The use of mixed powders with ceramic content or attached fiber materials is conceivable.

Die zweite Komponente des Ausgangswerkstoffs ist der organische Binder. Der Aufbau des Binders resultiert aus den vielfältigen und auch widersprüchlichen Anforderungen, so beispielsweise:

  • einem guten Benetzungsverhalten;
  • einer guten Fließfähigkeit in Verbindung mit dem Pulver;
  • der Ermöglichung des thermischen Schrumpfens beim Spritzgussprozess;
  • einer hohen Formstabilität bei der Handhabung des Grünlings;
  • einer guten Entfernbarkeit aus dem Grünling ohne hierbei Relativbewegungen der Pulverpartikel zu ermöglichen;
  • einer möglichst rückstandsfreien Entfernung vor dem Sinterprozess;
  • einer ökologischen Unbedenklichkeit.
The second component of the starting material is the organic binder. The structure of the binder results from the diverse and also contradictory requirements, such as:
  • a good wetting behavior;
  • a good flowability in connection with the powder;
  • enabling thermal shrinkage in the injection molding process;
  • a high dimensional stability during handling of the green compact;
  • good removability from the green compact without allowing relative movements of the powder particles;
  • as far as possible residue-free removal before the sintering process;
  • an ecological safety.

Diese Anforderungen haben dazu geführt, dass sich unterschiedliche Rezepturen auf dem Markt durchgesetzt haben. Keine erfüllt jedoch alle Anforderungen hundertprozentig. Die Wahl des geeigneten Binders hängt von den Anforderungen an das spätere Bauteil ab. Üblicherweise setzt sich aber ein Binder aus mindestens drei Komponenten zusammen, wobei jede ihre eigene Aufgabe besitzt:

  • Komponente 1 wirkt als Haftvermittler zwischen organischem und metallischem Anteil. Erzielt wird dies durch eine Oberflächen-Benetzung der Pulverpartikel.
  • Komponente 2 soll die Fließfähigkeit der gesamten Mischung für den Spritzgießprozess gewährleisten. Ziel ist es also, der Fließbewegung einen möglichst geringen Widerstand entgegenzusetzen.
  • Komponente 3 sichert dagegen eine hinreichende Grünlingfestigkeit und somit die Form- und Maßhaltigkeit des Formkörpers. Diese Komponente wird zumeist erst beim Sinterprozess und nicht, wie die beiden anderen Komponenten, bereits bei der Entbinderung aus dem Formkörper entfernt.
These requirements have led to the fact that different formulations have prevailed in the market. None, however, meets all requirements one hundred percent. The choice of the suitable binder depends on the requirements of the later component. Usually, however, a binder consists of at least three components, each with its own task:
  • Component 1 acts as a bonding agent between organic and metallic component. This is achieved by a surface wetting of the powder particles.
  • Component 2 is intended to ensure the flowability of the entire mixture for the injection molding process. The aim is therefore to counteract the flow movement as little resistance as possible.
  • In contrast, component 3 ensures a sufficient green strength and thus the dimensional and dimensional stability of the molding. This component is usually only removed during the sintering process and not, as the other two components, already during debindering from the molding.

Der nachfolgende Verfahrensschritt ist das Mischen des Pulvers mit dem organischen Binder. Ziel hierbei ist es, eine homogene Durchmischung aller Bestandteile zu erreichen, um auch im späteren Bauteil homogene Eigenschaften vorliegen zu haben. Besonders wichtig ist dies beim Entbinderungsprozess und dem nachfolgenden Sintern, da hierdurch eine gleichmäßige Schwindung über das gesamte Bauteil erzielt werden kann. Das Mischungsverhältnis aus Pulver und Binder bewegt sich in der Regel um ein Verhältnis von 60 Vol.-% zu 40 Vol.-%. Anzustreben ist es, die Zwischenräume zwischen den Pulverpartikeln auszufüllen, ohne deren Abstand zueinander zu vergrößern. Der Binder benetzt die Oberfläche der Pulverpartikel und zerstört vorhandene Agglomerate, welche durch die Verwendung sehr feiner Pulver gebildet werden. Der gesamte Prozess findet bei Temperaturen oberhalb der Schmelztemperatur des Binders statt und wird zumeist in Mischern, Knetern oder Extrudern durchgeführt. Die entstandene homogene Masse wird als Feedstock bezeichnet. Sie wird abschließend zu einem rieselfähigen Granulat weiterverarbeitet, was den Transport und die Lagerung vereinfacht. Das Granulat bietet ebenfalls die Möglichkeit, es in handelsüblichen Spritzgießmaschinen einzusetzen.The subsequent process step is the mixing of the powder with the organic binder. The aim here is to achieve a homogeneous mixing of all constituents in order to have homogeneous properties in the later component. This is particularly important in the debindering process and the subsequent sintering, as this can achieve a uniform shrinkage over the entire component. The mixing ratio of powder and binder is usually around a ratio of 60 vol .-% to 40 vol .-%. The aim is to fill in the spaces between the powder particles without increasing their distance from each other. The binder wets the surface of the powder particles and destroys existing agglomerates formed by the use of very fine powders. The entire process takes place at temperatures above the melting temperature of the binder and is usually carried out in mixers, kneaders or extruders. The resulting homogeneous mass is referred to as a feedstock. It is finally processed into a pourable granulate, which simplifies transport and storage. The granules also offer the possibility to use it in commercially available injection molding machines.

Es besteht die Möglichkeit, fertige Feedstock-Produkte zu erwerben, wie beispielsweise diejenigen der Firma BASF, die unter dem Handelsnamen CATAMOLD vertrieben werden.It is possible to purchase finished feedstock products, such as those of BASF, which are sold under the trade name CATAMOLD.

Die Formgebung des Feedstocks erfolgt beim Metallpulverspritzguss durch ein Spritzgießen. Zum Einsatz kommen handelsübliche Spritzgießmaschinen, die gegebenenfalls mit verschleißgeschützten Zylindereinheiten ausgerüstet werden. Der Prozess erfolgt analog zum Spritzgießen von Kunststoffen. Durch die Schnecke und eine externe Temperierung erfolgt die Plastifizierung des Feedstocks. Gebräuchliche Drücke zum Einpressen in die Form liegen zwischen 500 und 2000 bar. Die Zuführung des Feedstocks erfolgt über einen Anguss und gegebenenfalls mit diesem verbundene Angusskanäle. Ist die Masse im temperierten Werkzeug erstarrt, findet wie bei den Kunststoffen ein Schwindungsprozess im Bereich von unter einem Prozent statt. Über Auswerferstifte kann das Bauteil aus der Kavität gedrückt und entnommen werden. Das Ergebnis ist der Grünling, welcher sehr verzugsempfindlich ist und bis zur endgültigen Abkühlung bereits durch geringe Kräfte verformt werden kann. Ein sorgfältiges Handling ist hier also oberstes Gebot. Der Grünling weist in der Regel bei der Entnahme aus der Spritzgussform eine dem Anguss entsprechende Angussstange und einen oder mehrere Angusskanäle auf.The molding of the feedstock takes place during metal injection molding by injection molding. Commercially available injection molding machines are used, which are optionally equipped with wear-protected cylinder units. The process is analogous to the injection molding of plastics. Through the screw and an external tempering the plasticization of the feedstock takes place. Common pressures for pressing into the mold are between 500 and 2000 bar. The feeding of the feedstock via a sprue and optionally associated with this runners. If the mass is solidified in the tempered tool, a shrinkage process in the range of less than one percent takes place, as in the case of plastics. About ejector pins, the component can be pressed out of the cavity and removed. The result is the green compact, which is very sensitive to distortion and can already be deformed by small forces until the final cooling. Careful handling is the top priority here. As a rule, the green body has a sprue bar corresponding to the sprue and one or more runner channels when it is removed from the injection mold.

Was die Bauteilgestaltung angeht, ist alles realisierbar, was auch bei Kunststoffspritzgussbauteilen angewandt wird. Komplexe Geometrien lassen sich also durch den Einsatz von Schiebern und den mehrteiligen Aufbau der Form darstellen. Soweit es die Formgestaltung ermöglicht, sind selbst Hinterschneidungen, Querbohrungen oder fertige Gewinde herstellbar.As far as component design is concerned, everything that can be implemented in plastic injection molded parts is feasible. Complex geometries can thus be represented by the use of sliders and the multi-part structure of the mold. As far as it allows the design, even undercuts, cross holes or finished threads are produced.

Der nächste Arbeitsschritt ist das Entbindern. So bezeichnet man den Prozess, bei welchem der organische Anteil, also der Binder, aus demThe next step is debinding. Thus one calls the process, with which the organic portion, thus the binder, from the

Grünling entfernt wird. Hierzu haben sich mehrere Verfahren durchgesetzt, die zumeist in Abhängigkeit vom jeweils eingesetzten Binder arbeiten. Es lassen sich drei Grundprinzipien unterscheiden:Greenling is removed. For this purpose, several methods have prevailed, which usually work depending on the particular binder used. There are three basic principles:

Bei der thermischen Entbinderung werden die einzelnen organischen Substanzen durch ein definiertes Aufheizen aus dem Grünling verdampft.In thermal debinding, the individual organic substances are vaporized by a defined heating from the green compact.

Die Lösungsmittelentbinderung arbeitet dagegen mit einem Lösungsmittel, beispielsweise Aceton, welches die organischen Anteile aus dem Grünling herauslöst. Eine unlösliche Binderkomponente gewährleistet weiterhin den Zusammenhalt des Gefüges und dampft beim nachfolgenden Sinterprozess aus.The solvent debinder, however, works with a solvent, such as acetone, which dissolves the organic components from the green compact. An insoluble binder component further ensures the cohesion of the structure and evaporates during the subsequent sintering process.

Die katalytische Entbinderung arbeitet analog zur Lösungsmittelentbinderung, jedoch werden die organischen Komponenten nicht gelöst, sondern katalytisch in leicht zu verdampfende Anteile zersetzt. Diese verdampfen dann im nachfolgenden Sinterprozess.The catalytic debinding works analogously to the solvent debinding, but the organic components are not dissolved, but decomposed catalytically into easily evaporable fractions. These then evaporate in the subsequent sintering process.

Unabhängig vom eingesetzten Verfahren erhält man als Zwischenprodukt nach der Entbinderung einen äußerst porösen Formkörper, welcher lediglich durch einen Restbinderanteil von ca. zehn Prozent der ursprünglichen Menge zusammengehalten wird. Man bezeichnet diese Formkörper auch als Braunlinge. Der Restbinder verdampft schließlich vollständig im nachfolgenden Sinterprozess. Moderne Durchlaufanlagen können das Entbindern und das Sintern verknüpfen, so dass es zu einem fließenden Übergang zwischen beiden Prozessen kommen kann.Regardless of the process used, the intermediate product obtained after debindering is an extremely porous shaped body which is merely held together by a residual binder content of about ten percent of the original amount. These shaped bodies are also called brownlings. The residual binder finally evaporates completely in the subsequent sintering process. Modern conveyor systems can combine debindering and sintering so that a smooth transition between the two processes can occur.

Der Sinterprozess ist neben der Feedstockherstellung der know-howintensivste des gesamten Metallpulverspritzgussverfahrens. Hierbei wird der Braunling bei Temperaturen unterhalb des Schmelzpunktes der eingesetzten Legierung zu einem kompakten Körper verdichtet. Es findet also eine Wärmebehandlung mit fester Phase statt. Eventuell vorhandene Restbinderanteile werden in diesem Zuge ebenfalls verdampft. Durchgeführt wird die Wärmebehandlung in speziellen Hochtemperaturöfen unter Schutzgasatmosphäre oder im Vakuum. Der entstehende Schrumpfungsprozess ist abhängig von der Zusammensetzung des verwendeten Feedstocks und liegt in der Regel zwischen 10% und 20% bezogen auf die Ausgangsmaße des Grünlings beziehungsweise Braunlings. Ergebnis ist ein Bauteil mit einer Enddichte oberhalb 96% der theoretischen Dichte. Dies gewährleistet einen gasdichten und flüssigkeitsdichten Werkstoff, was bei vergleichbaren rein pulvermetallurgischen Herstellungsprozessen nicht oder nur mit sehr hohem Anteil an Nachbearbeitung zu erzielen ist. Eventuell vorhandene Restporen liegen fein verteilt und in geschlossener Form als eingeformte Porositäten im Werkstoffgefüge vor. Die größte Schwierigkeit im Verlauf dieses Prozessschrittes ist es, die Formstabilität des Bauteils bei den hohen Temperaturen zu gewährleisten.In addition to the production of feedstock, the sintering process is the most know-how intensive of the entire metal powder injection molding process. Here, the Braunling is at temperatures below the melting point compacted the used alloy into a compact body. So there is a heat treatment with a solid phase. Any existing residual binder shares are also evaporated in this course. The heat treatment is carried out in special high-temperature furnaces under a protective gas atmosphere or in a vacuum. The resulting shrinkage process is dependent on the composition of the feedstock used and is usually between 10% and 20% based on the initial dimensions of the green or brown. The result is a component with a final density above 96% of the theoretical density. This ensures a gas-tight and liquid-tight material, which can not be achieved with comparable purely powder metallurgical production processes or only with a very high proportion of post-processing. Any remaining pores are finely distributed and present in closed form as molded porosities in the material structure. The greatest difficulty in the course of this process step is to ensure the dimensional stability of the component at high temperatures.

Bei dem erfindungsgemäßen Verfahren kann vorgesehen werden, dass der Grünling langsam, insbesondere in einer Zeitspanne zwischen 10 und 25 Minuten abgekühlt wird. Durch das langsame Abkühlen kann verhindert werden, dass sich im Grünling Verspannungen bilden, die zu Rissen und Verzügen in dem Grünling oder später während des Sinterns zu Rissen und Verzügen in dem Verschlussschlitten führen könnten.In the method according to the invention it can be provided that the green compact is cooled slowly, in particular in a period of time between 10 and 25 minutes. The slow cooling can prevent the formation of stresses in the green compact which could lead to cracks and distortions in the green body or later during sintering to cracks and distortions in the closure sled.

Dabei kann insbesondere vorgesehen sein, dass zumindest während eines Teils des Abkühlvorgangs unterschiedliche Teile des Grünlings die gleiche oder eine nur derart unterschiedliche Temperatur aufweisen, dass in dem Grünling während des Abkühlens keine Risse und/oder Verzüge entstehen. Insbesondere das gleichmäßige Abkühlen kann zur Vermeidung von Rissen und Verzügen beitragen.It can be provided in particular that at least during a part of the cooling process, different parts of the green compact have the same or a temperature only so different that no cracks and / or distortions occur in the green body during cooling. In particular, the uniform cooling can contribute to the prevention of cracks and distortion.

Dies kann beispielsweise dadurch erreicht werden, dass der Grünling in einem Durchlaufofen abgekühlt wird. In einem Durchlaufofen können große Mengen von Grünlingen gleichzeitig abgekühlt werden, so dass sich der Einsatz eines derartigen Durchlaufofens in der Serienfertigung eignet.This can be achieved, for example, by cooling the green compact in a continuous furnace. In a continuous furnace large quantities of green compacts can be cooled simultaneously, so that the use of such a continuous furnace in series production is suitable.

Alternativ dazu besteht die Möglichkeit, dass der Grünling in einem Ölbad oder in Kontakt zu erwärmten Teilen, insbesondere Metallteilen abgekühlt wird. Ein derartiges Verfahren kann bei geringen Stückzahlen durchaus sinnvoll sein.Alternatively, there is the possibility that the green compact is cooled in an oil bath or in contact with heated parts, in particular metal parts. Such a method may well be useful for small quantities.

Der Grünling kann bei der Entnahme aus der Spritzgussform eine Angussstange und mindestens einen Angusskanal aufweisen.The green compact can have a sprue bar and at least one sprue channel when removed from the injection mold.

Es besteht die Möglichkeit, dass bei der Entnahme des Grünlings aus der Spritzgussform der Grünling an der Angussstange gehalten wird. Es hat sich gezeigt, dass sich in dem Grünling Verspannungen bilden können, wenn er an ungeeigneten Punkten zur Entnahme aus der Spritzgussform gegriffen wird. Das Halten des Grünlings an der Angusstange führt überraschender Weise nicht oder nur in sehr geringem Umfang zu Verspannungen beziehungsweise Verformungen des Grünlings.It is possible that when removing the green compact from the injection mold, the green compact is held on the sprue bar. It has been found that tension can form in the green compact when it is gripped at inappropriate points for removal from the injection mold. The holding of the green body at the Angußstange surprisingly not or only to a very limited extent to tension or deformation of the green body.

Es kann vorgesehen sein, dass die Entbinderung als katalytische Entbinderung durchgeführt wird, insbesondere in Stickstoffatmosphäre unter Zugabe von Salpetersäure.It can be provided that the debindering is carried out as catalytic debinding, in particular in a nitrogen atmosphere with the addition of nitric acid.

Gemäß einer bevorzugten Ausführungsform der vorliegenden Erfindung verbleibt die Angussstange und/oder der mindestens eine Angusskanal bis nach dem Sintern des Braunlings an dem zu fertigenden Verschlussschlitten. Insbesondere der mindestens eine Angusskanal trägt wesentlich zur Stabilisierung des Grünlings beziehungsweise des Braunlings bei, so dass bei dem Sintern die Gefahr von Rissen oder unerwünschten Verformungen deutlich reduziert werden kann.According to a preferred embodiment of the present invention, the sprue bar and / or the at least one sprue remains until after the sintering of the brown compact on the closure sled to be manufactured. In particular, the at least one runner substantially contributes to the stabilization of the green body or the brown, so that in the sintering Danger of cracks or unwanted deformations can be significantly reduced.

Vorzugsweise wird die Angussstange vor dem Sintern des Braunlings entfernt und in eine Bohrung in dem zu fertigenden Verschlussschlitten eingeschoben, um in dieser Bohrung als Abstützung während des Sinterns zu dienen. Aufgrund der Tatsache, dass die Angussstange unter gleichen Bedingungen aus dem gleichen Werkstoff hergestellt wurde wie der restliche Braunling, weist sie bei dem Sinterprozess die gleichen Schrumpfeigenschaften auf und kann somit optimal zur Abstützung verwendet werden. Gleichzeitig wird die Angussstange als typisches Abfallteil sinnvoll verwendet.Preferably, the sprue bar is removed prior to sintering the brownbody and inserted into a bore in the closure slide to be manufactured to serve as a support in this bore during sintering. Due to the fact that the sprue bar was made of the same material under the same conditions as the rest of the Braunling, it has the same shrinkage properties during the sintering process and can therefore be optimally used for support. At the same time, the sprue bar is used as a typical waste part.

Es besteht die Möglichkeit, als Werkstoff für das Spritzen des Grünlings 100Cr6 oder 21 NiCrMo2 (CATAMOLD 8620 von BASF) oder 42CrMo zu verwenden. Diese Werkstoffe zeichnen sich durch die erzielbaren Festigkeitswerte, aber auch durch ihre Elastizität und Härte aus.It is possible to use as material for spraying the green body 100Cr6 or 21 NiCrMo2 (CATAMOLD 8620 from BASF) or 42CrMo. These materials are characterized by the achievable strength values, but also by their elasticity and hardness.

Weitere Merkmale und Vorteile der vorliegenden Erfindung werden deutlich anhand der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele unter Bezugnahme auf die beiliegenden Abbildungen. Darin zeigen

Fig. 1
eine schematische perspektivische Ansicht eines mit einem erfindungsgemäßen Verfahren hergestellten Verschlussschlittens;
Fig. 2
eine schematische perspektivische Ansicht des Verschlussschlittens gemäß Fig. 1 als Grünling mit Angussstange und zwei Angusskanälen;
Fig. 3
eine Schnittansicht des Verschlussschlittens im Stadium gemäß Fig. 2;
Fig. 4
eine Fig. 3 entsprechende Schnittansicht des Verschlussschlittens als Braunling mit einer von den Anguskanälen gelösten Angussstange, die in eine Bohrung des Verschlussschlittens eingebracht ist.
Further features and advantages of the present invention will become apparent from the following description of preferred embodiments with reference to the accompanying drawings. Show in it
Fig. 1
a schematic perspective view of a closure slide produced by a method according to the invention;
Fig. 2
a schematic perspective view of the closure slide of Figure 1 as a green with sprue bar and two sprue channels ..;
Fig. 3
a sectional view of the closing slide in the stage of FIG. 2;
Fig. 4
a corresponding sectional view of the closing slide as Braunling with a sprue of the Anguskanäle dissolved sprue bar, which is introduced into a bore of the closure slide.

Aus Fig. 1 ist ein typischer Verschlussschlitten1 ersichtlich, der mit einem erfindungsgemäßen Verfahren hergestellt ist. Der Verschlussschlitten 1 weist in einem mittleren Bereich ein Auswurffenster 2 auf, durch das bei der Bewegung des Verschlussschlittens 1 aufgrund des Abfeuern eines Schusses die leere Patronenhülse ausgeworfen wird.From Fig. 1, a typical shutter slide 1 can be seen, which is produced by a method according to the invention. The shutter slide 1 has, in a central region, an ejection window 2 through which the empty cartridge case is ejected during the movement of the closure slide 1 due to the firing of a shot.

Der Verschlussschlitten ist in den Fig. 1 bis Fig. 4 jeweils mit unterschiedlichen Bezugszeichen 1, 3, 4 versehen, weil in den Abbildungen unterschiedliche Stadien des Herstellungsprozesses verdeutlicht sind. Dabei ist mit dem Bezugszeichen 1 der fertig gesinterte Verschlussschlitten, mit dem Bezugszeichen 2 der Grünling nach dem Spritzen und mit dem Bezugszeichen 3 der Braunling vor dem Sintern bezeichnet. In den Abbildungen ist dabei nicht berücksichtigt, dass der Verschlussschlitten während des Übergangs vom Grünling zum Braunling und zum gesinterten Endprodukt eine Schrumpfung erfährt.The closure slide is provided in each case with different reference numerals 1, 3, 4 in FIGS. 1 to 4, because different stages of the production process are illustrated in the figures. Here, by reference numeral 1, the finished sintered slide, with the reference numeral 2 of the green compact after spraying and designated by the reference numeral 3 Braunling before sintering. The figures do not take into account that the closing slide shrinks during the transition from green to brown and to the final sintered product.

Bei dem abgebildeten Ausführungsbeispiel wird als Ausgangsmaterial 100Cr6 für das Spritzen des Grünlings 3 verwendet. Nach dem Spritzvorgang wird der Grünling 3 an der Angussstange 5 (siehe dazu Fig. 2 und Fig. 3) gehalten und der nicht abgebildeten Spritzgussform entnommen. Diesen der Spritzgussform entnommenen Grünling 3 zeigen Fig. 2 und Fig. 3. Diesen Abbildungen ist entnehmbar, dass sich von der Angussstange 5 zwei Angusskanäle 6 in Längsrichtung des Grünlings 3 durch das Auswurffenster 2 erstrecken.In the illustrated embodiment, 100Cr6 is used as the raw material for spraying the greenware 3. After the injection process, the green compact 3 is held on the sprue bar 5 (see FIGS. 2 and 3) and removed from the injection mold (not shown). FIGS. 2 and 3 show these green bodies 3 taken from the injection mold. These illustrations show that two sprue channels 6 extend from the sprue bar 5 in the longitudinal direction of the green body 3 through the ejection window 2.

Der Grünling 3 wird in einem Durchlaufofen innerhalb von etwa 15 bis 20 Minuten von etwa 100°C auf Raumtemperatur abgekühlt. Der Durchlaufofen gewährleistet dabei eine Abkühlung sämtlicher Teile des Grünlings 3 mit etwa der gleichen Geschwindigkeit.The green compact 3 is cooled in a continuous furnace from about 100 ° C to about room temperature over about 15 to 20 minutes. The continuous furnace ensures a cooling of all parts of the green body 3 at about the same speed.

Nach der Abkühlung wird der Grünling 3 durch Behandlung mit Salpetersäure in einer Stickstoffatmosphäre katalytisch zu einem Braunling 4 entbindert. Die Angussstange 5 kann entweder direkt nach dem Spritzen von dem Grünling 3 gelöst, beispielsweise abgebrochen, werden, oder aber nach dem Abkühlen oder aber erst nach dem Entbindern von dem Braunling 4 gelöst werden.After cooling, the green compact 3 is catalytically removed by treatment with nitric acid in a nitrogen atmosphere to a Braunling 4. The sprue bar 5 can either be solved directly after spraying of the green body 3, for example, broken off, or be solved by the Braunling 4 after cooling or only after debindering.

Fig. 3 und Fig. 4 ist entnehmbar, dass der Verschlussschlitten 1 beziehungsweise der Grünling 3 und der Braunling 4 eine Bohrung 7 für die Aufnahme des Schlagbolzens der mit dem Verschlussschlitten 1 zu bestückenden Schusswaffe aufweist. Damit die diese Bohrung 7 umgebenden Teile des Braunlings 4 während des Sinterns abgestützt werden, wird die abgebrochene Angussstange 5 in die Bohrung 7 eingebracht.It can be taken from FIGS. 3 and 4 that the closure slide 1 or the greenware 3 and the browning 4 have a bore 7 for receiving the firing pin of the firearm to be fitted with the closure slide 1. So that the bore 7 surrounding parts of the Braunlings 4 supported during sintering be, the broken sprue bar 5 is introduced into the bore 7.

Die sich durch das Auswurffenster 2 in Längsrichtung des Verschlussschlittens 1 beziehungsweise des Braunlings 4 erstreckenden Angusskanäle 6 werden während des Sinterns an dem Braunling 4 belassen, um diesem zusätzliche Stabilität zu verleihen. Die Angusskanäle 6 werden nach Beendigung des Sinterns beispielsweise durch Abfräsen entfernt, so dass das Auswurffenster 2 freigelegt wird.The sprue channels 6 extending through the ejection window 2 in the longitudinal direction of the closure carriage 1 or of the brown body 4 are left on the Braunling 4 during the sintering in order to give it additional stability. The sprue channels 6 are removed after completion of the sintering, for example by milling, so that the ejection window 2 is exposed.

Claims (11)

Verfahren zur Herstellung eines Verschlussschlittens (1) einer Schusswaffe, dadurch gekennzeichnet, dass der Verschlussschlitten (1) durch ein Metallpulverspritzgussverfahren mit folgenden Verfahrensschritten hergestellt wird: - Spritzen eines Grünlings (3) in einer Spritzgussform; - Abkühlen des Grünlings (3); - Entbinderung des Grünlings (3) zu einem Braunling (4); - Sintern des Braunlings (4). Method for producing a closing slide (1) of a firearm, characterized in that the closing slide (1) is produced by a metal powder injection molding method with the following method steps: - Spraying a green body (3) in an injection mold; - cooling the green body (3); - debindering the green compact (3) to a brownling (4); - sintering of the brownling (4). Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Grünling (3) langsam, insbesondere in einer Zeitspanne zwischen 10 und 25 Minuten abgekühlt wird.A method according to claim 1, characterized in that the green compact (3) is cooled slowly, in particular in a period between 10 and 25 minutes. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass zumindest während eines Teils des Abkühlvorgangs unterschiedliche Teile des Grünlings (3) die gleiche oder eine nur derart unterschiedliche Temperatur aufweisen, dass in dem Grünling (3) während des Abkühlens keine Risse und/oder Verzüge entstehen.A method according to claim 1, characterized in that at least during a part of the cooling process, different parts of the green body (3) have the same or only so different temperature that in the green body (3) during cooling, no cracks and / or distortions. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Grünling (3) in einem Durchlaufofen abgekühlt wird.A method according to claim 1, characterized in that the green compact (3) is cooled in a continuous furnace. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Grünling (3) in einem Ölbad oder in Kontakt zu erwärmten Teilen, insbesondere Metallteilen abgekühlt wird.A method according to claim 1, characterized in that the green compact (3) is cooled in an oil bath or in contact with heated parts, in particular metal parts. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Grünling (3) bei der Entnahme aus der Spritzgussform eine Angussstange (5) und mindestens einen Angusskanal (6) aufweist.A method according to claim 1, characterized in that the green body (3) during removal from the injection mold a sprue bar (5) and at least one sprue (6). Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass bei der Entnahme des Grünlings (3) aus der Spritzgussform der Grünling (3) an der Angussstange (5) gehalten wird.A method according to claim 6, characterized in that upon removal of the green compact (3) from the injection mold, the green compact (3) is held on the sprue bar (5). Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Entbinderung als katalytische Entbinderung durchgeführt wird, insbesondere in Stickstoffatmosphäre unter Zugabe von Salpetersäure.A method according to claim 1, characterized in that the debindering is carried out as a catalytic debindering, in particular in a nitrogen atmosphere with the addition of nitric acid. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Angussstange (5) und/oder der mindestens eine Angusskanal (6) bis nach dem Sintern des Braunlings (4) an dem zu fertigenden Verschlussschlitten (1) verbleibt.A method according to claim 1, characterized in that the sprue bar (5) and / or the at least one runner (6) until after sintering of the brown stock (4) remains to be produced on the closure slide (1). Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Angussstange (5) vor dem Sintern des Braunlings (4) entfernt wird und in eine Bohrung (7) in dem zu fertigenden Verschlussschlitten (1) eingeschoben wird, um in dieser Bohrung (7) als Abstützung während des Sinterns zu dienen.A method according to claim 1, characterized in that the sprue bar (5) is removed prior to sintering the brown stock (4) and inserted into a bore (7) in the closure slide (1) to be manufactured, in this bore (7) as Serve to serve during sintering. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass als Werkstoff für das Spritzen des Grünlings (3) 100Cr6 oder 21 NiCrMo2 (CATAMOLD 8620 von BASF) oder 42CrMo verwendet wird.A method according to claim 1, characterized in that 100Cr6 or 21 NiCrMo2 (CATAMOLD 8620 from BASF) or 42CrMo is used as the material for spraying the green compact (3).
EP06008184A 2005-04-26 2006-04-20 Method of manufacturing a slide of a firearm Revoked EP1717539B1 (en)

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AT510291B1 (en) * 2011-04-04 2012-03-15 Wilhelm Bubits PISTOL WITH MULTIPLE TRAINS
WO2013113880A1 (en) 2012-02-02 2013-08-08 Basf Se Thermoplastic pom material
WO2014170242A1 (en) 2013-04-18 2014-10-23 Basf Se Polyoxymethylene copolymers and thermoplastic pom composition
US10961384B2 (en) 2014-05-21 2021-03-30 Basf Se Process for improving the flexural toughness of moldings

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US7731894B2 (en) 2010-06-08
US20070084040A1 (en) 2007-04-19
ATE413579T1 (en) 2008-11-15
RU2006114005A (en) 2007-11-20
DE502006001973D1 (en) 2008-12-18
RU2427450C2 (en) 2011-08-27

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