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WO1986003705A1 - Method for producing a single piece valve box for a rotary slide valve - Google Patents

Method for producing a single piece valve box for a rotary slide valve Download PDF

Info

Publication number
WO1986003705A1
WO1986003705A1 PCT/EP1985/000681 EP8500681W WO8603705A1 WO 1986003705 A1 WO1986003705 A1 WO 1986003705A1 EP 8500681 W EP8500681 W EP 8500681W WO 8603705 A1 WO8603705 A1 WO 8603705A1
Authority
WO
WIPO (PCT)
Prior art keywords
control grooves
diameter
valve sleeve
closed
area
Prior art date
Application number
PCT/EP1985/000681
Other languages
German (de)
French (fr)
Inventor
Werner Breitweg
Original Assignee
Zahnradfabrik Friedrichshafen Ag
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Zahnradfabrik Friedrichshafen Ag filed Critical Zahnradfabrik Friedrichshafen Ag
Publication of WO1986003705A1 publication Critical patent/WO1986003705A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/20—Making machine elements valve parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/12—Forming profiles on internal or external surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/001—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass valves or valve housings

Definitions

  • the invention relates to a method for producing a one-piece valve sleeve for rotary slide valves.
  • Valve liners of rotary slide valves have axially extending control grooves on their inner circumferential surface, which are limited in their axial length and are sealed liquid-tight.
  • control grooves are produced, for example, by broaching.
  • the cleared and thus open at both ends control grooves must be closed at their ends with separate locking rings.
  • Such end rings must, however, be fitted very precisely. On the one hand, they have to seal on their end faces in order to avoid leaks between the individual control grooves and, on the other hand, they seal the pressure grooves towards the return via their high-precision inside diameter. Too wide a fit can lead to leaks between the control sleeve and the end rings. If the fit is too tight, there is a risk that the control sleeve will be deformed.
  • control sleeve in one piece. It is possible to work the control grooves into the bore of the control sleeve using a special milling cutter. Another possibility is to use a special cutting tool to produce control grooves with an arcuate longitudinal cross section.
  • control grooves in one-piece control bushes are known from GB-PS 958 217 and DE-OS 20 04 587. Because of the relatively small inner diameter and the relatively long length of the control bushing, there is a very narrow machining space for the production of the control grooves . The control grooves can therefore only be produced with a limited cross section and with a limited length.
  • control grooves must be arranged relatively close to at least one end of the control sleeve so that the control grooves can be machined at all.
  • the present invention has for its object to provide a method for producing a one-piece valve sleeve for rotary slide valves of the type mentioned, with which this is simple and economical to manufacture.
  • the limitation in cross section, in length and in the position of the control grooves is to be expanded.
  • this object is achieved by the method characterized in claim 1.
  • the non-cutting machining of the valve sleeve allows any cross-sections - with respect to the longitudinal and the transverse axis - of the control grooves to be achieved, for example a favorable shape of the cross-section and a certain depth of the control grooves, a favorable flow of the pressure medium enable in the rotary slide valve.
  • the control grooves can be produced in a length required for a favorable flow pattern.
  • the ends of the control grooves can, if necessary, be located far from the ends of the valve sleeve, since the control grooves can be closed at any point in the non-cutting manufacturing process.
  • valve liners with a smaller inner diameter the manufacture advantageously takes place in two process steps, while in the case of valve liners with a larger inner diameter, one method step using a dismountable core is sufficient.
  • FIG. 1 shows a longitudinal section through a valve sleeve after a first process step
  • FIG. 2 shows the cross section through the valve sleeve of FIG. 1 along the line II-II,
  • Fig. 3 shows a longitudinal section through the valve sleeve after the completion of the inner contour.
  • a valve sleeve 1 is produced from a blank in the form of a rod section (not shown) or a round blank by cold forming, for example by cold extrusion.
  • the valve sleeve 1 has a central main bore 2 with axially extending control grooves 3, which are closed at one end 4 in accordance with the shape of the stamp.
  • the other end 5 of the control grooves 3 is open.
  • a bore section 6 with a larger diameter 7 is arranged.
  • the diameter 7 corresponds to the bottom of the control grooves 3 and is therefore larger than the diameter of the central main bore 2.
  • a collar 8 with a larger outer diameter is arranged on the outer circumferential surface of the control sleeve 1.
  • the collar 8 is pressed radially inwards by cold forming until the inside diameter of the control bush also in the area of the bore section 6 corresponds to the diameter of the central main bore 2 and the inside diameter in the area of the control grooves 3.
  • the cold forming of the second process step can be carried out, for example, by a second force extrusion or drawing-in process.
  • the valve sleeve 1 is expediently received in its main bore on a mandrel 9, so that the material flow in the region of the collar 8 is limited internally.
  • the second process step can also be carried out by kneading or hammering.
  • a mandrel 9 is expediently used.
  • a core that can be dismantled and extended. step to unite.
  • a core is inserted into a tube, the inside diameter of which corresponds to the diameter in the base of the control grooves 3, and consists of several individual parts corresponding to the control grooves 3.
  • the valve sleeve is formed around this core by kneading or hammering. After this cold forming process is complete, the core is dismantled and pulled out of the valve sleeve bore. Both ends of the control grooves 3 shaped in this way are already closed after this one method step, as shown in FIG. 3.
  • valve sleeve has to be manufactured without a cold extrusion process because the necessary devices are missing, a machined, essentially cylindrical part can be used as the blank.
  • the control grooves 3 are incorporated into this part by means of butting or another machining process, so that one end 4 thereof is closed and the other end 5 is opened in the direction of a recess which corresponds to the bore section 6.
  • the blank also has a collar 8 on its outer peripheral surface.
  • the blank essentially corresponds to the shaped part of the valve sleeve 1 shown in FIG. 1, which is produced by cold forming from a " pipe.
  • this shaped part is cut by a process step with cold forming, for example kneading or hammering , brought into the final form in which the control grooves 3 are closed at both ends.
  • the inner diameter of the valve sleeve must be finished in a further process step. This can be done by a non-cutting method, for example by calibration.
  • a calibration mandrel is used, with which the control grooves 3 can be brought to the required positional and dimensional accuracy. If, after the non-cutting cold forming, there are 3 roundings on the control edges of the control grooves which can no longer be eliminated by a calibration process, the inside diameter of the valve sleeve 1 is expediently machined.
  • valve sleeve 1 For both the non-cutting and the machining finishing, it is necessary for the valve sleeve 1 to have a finishing allowance in the area of its inner diameter after the non-cutting cold forming. This addition of finishing is displaced by the calibration method or processed by the machining finishing method, for example turning or grinding.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)
  • Forging (AREA)
  • Multiple-Way Valves (AREA)

Abstract

A single piece valve box for a rotary slide valve has on its inner circonference axial control grooves (3) of which the axial length is delimited by the surface of the inner circonference. Said valve box is produced by forming from a flank, for example a pipe section. In a first step, the control grooves (3) are shaped by cold forming so that one of their ends (4) is closed and the other end (5) is open. The open ends of the control grooves (3) are terminated in a partial bore (6) having a larger diameter. A collar (8) having a larger outer diameter is formed on the contour of the valve box at the partial bore (6). In a second step, said collar (8) is pressed inwardly by cold forming till the inner diameter corresponds in that region also to the inner diameter of the remainder of the valve box, thereby closing the other end of the control grooves (3).

Description

Verfahren zur Herstellung einer einstückigen Ventilbüchse für Drehschieberventile Process for producing a one-piece valve sleeve for rotary slide valves
Die Erfindung betrifft ein Verfahren zur Herstellung einer einstückigen Ventilbüchse für Drehschieberventile.The invention relates to a method for producing a one-piece valve sleeve for rotary slide valves.
Ventilbüchsen von Drehschieberventilen weisen an ihrer inne¬ ren Umfangsfläche axial verlaufende Steuernuten auf, die in ihrer axialen Länge begrenzt und flüssigkeitsdicht abgeschlossen sind.Valve liners of rotary slide valves have axially extending control grooves on their inner circumferential surface, which are limited in their axial length and are sealed liquid-tight.
Solche Steuernuten werden beispielsweise durch Räumen herge¬ stellt. Die durchgeräumten und damit an beiden Enden offenen Steuernuten müssen durch gesonderte Verschlußringe an ihren Enden abgeschlossen werden. Derartige Endringe müssen jedoch sehr genau eingepaßt sein. Sie müssen einerseits an ihrer Stirnfläche ab¬ dichten, um ündichtheiten zwischen den einzelnen Steuernuten zu vermeiden und andererseits über ihren hoch-präzisen Innendurch¬ messer die Drucknuten zum Rücklauf hin abdichten. Dabei kann eine zu weite Einpassung zu ündichtheiten zwischen der Steuerbüchse und den Endringen führen. Bei einer zu engen Passung besteht die Gefahr, daß die Steuerbüchse deformiert wird.Such control grooves are produced, for example, by broaching. The cleared and thus open at both ends control grooves must be closed at their ends with separate locking rings. Such end rings must, however, be fitted very precisely. On the one hand, they have to seal on their end faces in order to avoid leaks between the individual control grooves and, on the other hand, they seal the pressure grooves towards the return via their high-precision inside diameter. Too wide a fit can lead to leaks between the control sleeve and the end rings. If the fit is too tight, there is a risk that the control sleeve will be deformed.
Zur Vermeidung dieser Nachteile wurde vorgeschlagen, die Steuerbüchse einstückig herzustellen. Dabei besteht die Möglich¬ keit, die Steuernuten durch einen speziellen Fräser in die Boh¬ rung der Steuerbüchse einzuarbeiten. Eine andere Möglichkeit besteht darin, durch ein spezielles Schneidwerkzeug Steuernuten mit einem kreisbogenfδrmigen Längsquerschnitt zu erzeugen. Der¬ artige Steuernuten in einstückigen Steuerbüchsen sind bekannt aus der GB-PS 958 217 und der DE-OS 20 04 587. Wegen des relativ kleinen Innendurchmessers und der relativ großen Länge der Steuer¬ büchse ergibt sich ein sehr beengter Bearbeitungsraum für die Herstellung der Steuernuten. Die Steuernuten können deshalb nur mit einem begrenzten Querschnitt und mit einer begrenzten Länge hergestellt werden. Außerdem müssen die Steuernuten relativ nah an wenigstens einem Ende der Steuerbüchse angeordnet sein, damit eine Bearbeitung der Steuernuten überhaupt möglich ist. Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Herstellung einer einstückigen Ventilbüchse für Drehschieberventile der eingangs erwähnten Art zu schaffen, mit dem diese einfach und wirtschaftlich herstellbar ist. Insbeson¬ dere soll die Begrenzung im Querschnitt, in der Länge und in der Lage der Steuernuten erweitert werden.To avoid these disadvantages, it has been proposed to manufacture the control sleeve in one piece. It is possible to work the control grooves into the bore of the control sleeve using a special milling cutter. Another possibility is to use a special cutting tool to produce control grooves with an arcuate longitudinal cross section. Such control grooves in one-piece control bushes are known from GB-PS 958 217 and DE-OS 20 04 587. Because of the relatively small inner diameter and the relatively long length of the control bushing, there is a very narrow machining space for the production of the control grooves . The control grooves can therefore only be produced with a limited cross section and with a limited length. In addition, the control grooves must be arranged relatively close to at least one end of the control sleeve so that the control grooves can be machined at all. The present invention has for its object to provide a method for producing a one-piece valve sleeve for rotary slide valves of the type mentioned, with which this is simple and economical to manufacture. In particular, the limitation in cross section, in length and in the position of the control grooves is to be expanded.
Erfindungsgemäß wird diese Aufgabe durch das im Anspruch 1 gekennzeichnete Verfahren gelöst. Durch die spanlose Bearbei¬ tung der Ventilbüchse können beliebige Querschnitte - bezogen auf die Längs- und die Querachse - der Steuernuten erreicht wer¬ den, die beispielsweise durch eine günstige Formgebung des Quer¬ schnittes und durch eine bestimmte Tiefe der Steuernuten einen günstigen Strömungsverlauf des Druckmittels in dem Drehschieber¬ ventil ermöglichen. Die Steuernuten können in einer für einen günstigen Strömungsverlauf erforderlichen Länge hergestellt wer¬ den. Ebenso können die Enden der Steuernuten bei Bedarf weit entfernt von den Enden der Ventilbüchse liegen, da das Verschlie¬ ßen der Steuernuten im spanlosen Herstellungsverfahren an jeder beliebigen Stelle möglich ist.According to the invention, this object is achieved by the method characterized in claim 1. The non-cutting machining of the valve sleeve allows any cross-sections - with respect to the longitudinal and the transverse axis - of the control grooves to be achieved, for example a favorable shape of the cross-section and a certain depth of the control grooves, a favorable flow of the pressure medium enable in the rotary slide valve. The control grooves can be produced in a length required for a favorable flow pattern. Likewise, the ends of the control grooves can, if necessary, be located far from the ends of the valve sleeve, since the control grooves can be closed at any point in the non-cutting manufacturing process.
Bei Ventilbüchsen mit kleinerem Innendurchmesser erfolgt die Herstellung vorteilhafterweise in zwei Verfahrensschritten, während bei Ventilbüchsen mit größerem Innendurchmesser ein Ver¬ fahrensschritt unter Verwendung eines zerlegbaren Kernes aus¬ reicht.In the case of valve liners with a smaller inner diameter, the manufacture advantageously takes place in two process steps, while in the case of valve liners with a larger inner diameter, one method step using a dismountable core is sufficient.
Im folgenden wird die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispieles näher erläutert. Es zeigtThe invention is explained in more detail below with reference to an embodiment shown in the drawing. It shows
Fig. 1 einen Längsschnitt durch eine Ventilbüchse nach einem ersten Verfahrensschritt,1 shows a longitudinal section through a valve sleeve after a first process step,
Fig. 2 den Querschnitt durch die Ventilbüchse der Fig. 1 gemäß der Linie II-II,2 shows the cross section through the valve sleeve of FIG. 1 along the line II-II,
Fig. 3 einen Längsschnitt durch die Ventilbüchse nach der Fertigstellung der inneren Kontur. Aus einem Rohling in der Form eines nicht dargestellten Stangenabschnittes oder einer Ronde wird spanlos durch Kaltumfor¬ mung, beispielsweise durch Kaltfließpressen, eine Ventilbüchse 1 in einem ersten Verfahrensschritt erzeugt. Nach diesem Verfah¬ rensschritt weist die Ventilbüchse 1 eine zentrale Hauptbohrung 2 mit axial verlaufenden Steuernuten 3 auf, die an ihrem einen Ende 4 entsprechend der Formgebung des Stempels geschlossen sind. Das andere Ende 5 der Steuernuten 3 ist offen. An diesem offenen Ende 5 der Steuernuten 3 ist ein Bohrungsabschnitt 6 mit größerem Durchmesser 7 angeordnet. Der Durchmesser 7 entspricht dem Grund der Steuernuten 3 und ist damit größer als der Durchmesser der zentralen Hauptbohrung 2.Fig. 3 shows a longitudinal section through the valve sleeve after the completion of the inner contour. In a first method step, a valve sleeve 1 is produced from a blank in the form of a rod section (not shown) or a round blank by cold forming, for example by cold extrusion. After this procedural step, the valve sleeve 1 has a central main bore 2 with axially extending control grooves 3, which are closed at one end 4 in accordance with the shape of the stamp. The other end 5 of the control grooves 3 is open. At this open end 5 of the control grooves 3, a bore section 6 with a larger diameter 7 is arranged. The diameter 7 corresponds to the bottom of the control grooves 3 and is therefore larger than the diameter of the central main bore 2.
In dem Bereich des Bohrungsabschnittes 6 ist an der Außen- umfangsfläche der Steuerbüchse 1 ein Bund 8 mit größerem Außen¬ durchmesser angeordnet.In the area of the bore section 6, a collar 8 with a larger outer diameter is arranged on the outer circumferential surface of the control sleeve 1.
In einem zweiten Verfahrensschritt wird der Bund 8 durch Kaltverformung radial nach innen gedrückt, bis der Innendurch¬ messer der Steuerbüchse auch in dem Bereich des Bohrungsabschnit¬ tes 6 dem Durchmesser der zentralen Hauptbohrung 2 und dem Innen¬ durchmesser im Bereich der Steuernuten 3 entspricht.In a second process step, the collar 8 is pressed radially inwards by cold forming until the inside diameter of the control bush also in the area of the bore section 6 corresponds to the diameter of the central main bore 2 and the inside diameter in the area of the control grooves 3.
Die Kaltumformung des zweiten Verfahrensschrittes kann bei¬ spielsweise durch einen zweiten Kraftfließpreß- oder Einziehvor¬ gang erfolgen. Zweckmäßigerweise wird dazu die Ventilbüchse 1 in ihrer Hauptbohrung auf einen Dorn 9 aufgenommen, so daß der Mate¬ rialfluß im Bereich des Bundes 8 nach innen begrenzt wird.The cold forming of the second process step can be carried out, for example, by a second force extrusion or drawing-in process. For this purpose, the valve sleeve 1 is expediently received in its main bore on a mandrel 9, so that the material flow in the region of the collar 8 is limited internally.
Anstelle eines zweiten Kaltfließpreß-oder Einziehvorganges kann der zweite Verfahrensschritt auch durch Rundkneten oder Hämmern erfolgen. Auch hierbei wird zweckmäßigerweise ein Dorn 9 verwendet.Instead of a second cold extrusion or drawing-in process, the second process step can also be carried out by kneading or hammering. Here, too, a mandrel 9 is expediently used.
Bei einer Ventilbüchse mit größerem Innendurchmeser ist es möglich, die beiden Verfahrensschritte durch die Verwendung eines zerlegbaren und ausfahrbaren Kernes zu einem einzigen Verfahrens- schritt zu vereinigen. Dazu wird in ein Rohr, dessen Innendurch¬ messer dem Durchmesser im Grund der Steuernuten 3 entspricht, ein Kern eingeführt, der aus mehreren einzelnen, den Steuernuten 3 entsprechenden Teilen besteht. Um diesen Kern herum wird die Ven¬ tilbüchse durch Rundkneten oder Hämmern geformt. Nach Beendigung dieses Kaltumformvorganges wird der Kern zerlegt und aus der Boh¬ rung der Ventilbüchse herausgezogen. Beide Enden der so geform¬ ten Steuernuten 3 sind bereits nach diesem einen Verfahrensschritt geschlossen, wie dies in Fig. 3 dargestellt ist.In the case of a valve sleeve with a larger inner diameter, it is possible to combine the two process steps into one process by using a core that can be dismantled and extended. step to unite. For this purpose, a core is inserted into a tube, the inside diameter of which corresponds to the diameter in the base of the control grooves 3, and consists of several individual parts corresponding to the control grooves 3. The valve sleeve is formed around this core by kneading or hammering. After this cold forming process is complete, the core is dismantled and pulled out of the valve sleeve bore. Both ends of the control grooves 3 shaped in this way are already closed after this one method step, as shown in FIG. 3.
Muß die Ventilbüchse ohne Kaltfließpreßvorgang hergestellt werden, weil die erforderlichen Vorrichtungen fehlen, so kann als Rohling ein spanabhebend bearbeitetes, im wesentlichen zylindri¬ sches Teil verwendet werden. In dieses Teil sind die Steuernu¬ ten 3 durch Stoßen oder ein anderes spanabhebendes Verfahren eingearbeitet, so daß deren eine Enden 4 geschlossen und deren andere Enden 5 in Richtung auf eine Ausnehmung, die dem Bohrungs¬ abschnitt 6 entspricht, geöffnet sind. Der Rohling weist außerdem an seiner Außenumfangsfläche einen Bund 8 auf. Damit entspricht der Rohling im wesentlichen dem in Fig. 1 dargestellten, durch Kaltumformung aus einem "Rohr hergestellten Formstück der Ventil¬ büchse 1. Dieses spanabhebend hergestellte Formstück wird, wie oben beschrieben, durch einen Verfahrensschritt mit Kaltumformung, z. B. Rundkneten oder Hämmern, in die endgültige Form gebracht, in der die Steuernuten 3 an ihren beiden Enden geschlossen sind.If the valve sleeve has to be manufactured without a cold extrusion process because the necessary devices are missing, a machined, essentially cylindrical part can be used as the blank. The control grooves 3 are incorporated into this part by means of butting or another machining process, so that one end 4 thereof is closed and the other end 5 is opened in the direction of a recess which corresponds to the bore section 6. The blank also has a collar 8 on its outer peripheral surface. Thus, the blank essentially corresponds to the shaped part of the valve sleeve 1 shown in FIG. 1, which is produced by cold forming from a " pipe. As described above, this shaped part is cut by a process step with cold forming, for example kneading or hammering , brought into the final form in which the control grooves 3 are closed at both ends.
Je nach der Art der für die Umformverfahren verwendeten Werkzeuge entstehen an den Kanten der Steuernuten 3 Grate oder Rundungen. Da die Steuerkanten der Steuernuten 3 jedoch im all¬ gemeinen scharfkantig ausgebildet sein müssen, muß der Innen¬ durchmesser der Ventilbüchse in einem weiteren Verfahrensschritt fertigbearbeitet werden. Dies kann durch ein spanloses Verfahren, beispielsweise durch Kalibrieren, erfolgen. Dazu wird ein Kalib¬ rierdorn verwendet, mit dem die Steuernuten 3 auf die erforder¬ liche Lage- und Maßgenauigkeit gebracht werderi können. Sind nach der spanlosen Kaltumformung an den Steuerkanten der Steuernuten 3 Rundungen vorhanden, die nicht mehr durch ein Kalibrierverfahren zu beseitigen sind, so wird der Innendurchmes¬ ser der Ventilbüchse 1 zweckmäßigerweise spanabhebend fertigbear¬ beitet.Depending on the type of tools used for the forming process, 3 burrs or curves are formed on the edges of the control grooves. However, since the control edges of the control grooves 3 generally have to be sharp-edged, the inner diameter of the valve sleeve must be finished in a further process step. This can be done by a non-cutting method, for example by calibration. For this purpose, a calibration mandrel is used, with which the control grooves 3 can be brought to the required positional and dimensional accuracy. If, after the non-cutting cold forming, there are 3 roundings on the control edges of the control grooves which can no longer be eliminated by a calibration process, the inside diameter of the valve sleeve 1 is expediently machined.
Sowohl für die spanlose als auch für die spanabhebende Fer¬ tigbearbeitung ist es erforderlich, daß die Ventilbüchse 1 im Bereich ihres Innendurchmessers nach der spanlosen Kaltumformung eine Fertigbearbeitungszugabe aufweist. Diese Fertigbearbeitungs¬ zugabe wird durch das Kalibrierverfahren verdrängt bzw. durch das spanabhebende Fertigbearbeitungsverfahren, beispielsweise Drehen oder Schleifen, abgearbeitet.For both the non-cutting and the machining finishing, it is necessary for the valve sleeve 1 to have a finishing allowance in the area of its inner diameter after the non-cutting cold forming. This addition of finishing is displaced by the calibration method or processed by the machining finishing method, for example turning or grinding.
Aufgrund der bei der Kaltumformung auftretenden Kalt¬ verfestigung des Werkstoffes ist es möglich, einen billigeren Ausgangswerkstoff zu verwenden, um eine gleichwertige Bauteilfe¬ stigkeit zu erreichen wie mit einem höherwertigen Ausgangswerk¬ stoff und spanabhebender Bearbeitung der Ventilbüchse. Due to the work hardening of the material that occurs during cold forming, it is possible to use a cheaper starting material in order to achieve component strength equivalent to that of a higher quality starting material and machining of the valve sleeve.
Bezugszeichenreference numeral
1 Ventilbüchse1 valve sleeve
2 Zentrale Hauptbohrung2 Central main bore
3 Steuernut3 tax groove
4 Geschlossenes Ende4 Closed end
5 Offenes Ende5 Open end
6 Bohrungsabschnitt6 bore section
7 Durchmesser7 diameters
8 Bund8 fret
9 Dorn 9 thorn

Claims

A n s p r ü c h e Expectations
1. Verfahren zur Herstellung einer einstückigen Ventilbüchse für Drehschieberventile, die an ihrer inneren Umfangsfläche axial verlaufende und in ihrer axialen Länge durch die innere Umfangs¬ fläche begrenzte und geschlossene Steuernuten aufweist, dadurch g e k e n n z e i c h n e t , daß die Ventilbüchse (1) aus einem Rohling spanlos mit einer im Bereich des Innendurchmessers der Ventilbüchse (1) verbleibenden Fertigbearbeitungszugabe her¬ gestellt wird und daß der Innendurchmesser der Ventilbüchse (1) anschließend spanlos oder spanabhebend fertigbearbeitet wird.1. A method for producing a one-piece valve sleeve for rotary slide valves, which has on its inner peripheral surface axially extending and in its axial length by the inner peripheral surface limited and closed control grooves, characterized in that the valve sleeve (1) from a blank with a non-cutting in the area of the inner diameter of the valve sleeve (1) remaining finishing allowance is produced and that the inner diameter of the valve sleeve (1) is then machined without cutting or machining.
2. Verfahren nach Anspruch 1 , dadurch g e k e n n ¬ z e i c h n e t , daß als Rohling ein Stangenabschnitt verwendet wird, daß in einem ersten Verfahrensschritt durch Kaltumformung eine zentrale Hauptbohrung (2) und die Steuernuten (3) ein¬ gearbeitet werden, derart, daß die Steuernuten (3) an ihrem einen Ende (4) geschlossen und an ihrem anderen Ende (5) offen sind und an dem offenen Ende (5) an einen Bohrungsab¬ schnitt (6) der Ventilbüchse (1) anschließen, dessen Durch¬ messer (7) etwa dem Durchmesser im Grund der Steuernuten (3) entspricht und damit größer ist als der Durchmesser der Hauptbohrung (2) und daß an der Außenumfangsflache der Ven¬ tilbüchse (1) im Bereich des Bohrungsabsσhnittes (6) ein Bund (8) mit größerem Außendurchmesser entsteht und daß in einem zweiten Verfahrensschritt der Bund (8) durch Kaltumformung radial nach innen gedrückt wird, bis der Innendurchmesser der Ventilbüchse (1) in diesen Bereich dem Durchmesser der Hauptbohrung (2) und dem Innendurch¬ messer im Bereich der Steuernuten (3) entspricht, so daß die Steuernuten (3) an ihrem anderen Ende geschlossen sind.2. The method according to claim 1, characterized ¬ characterized in that a rod section is used as a blank that in a first process step by cold forming a central main bore (2) and the control grooves (3) are machined in such a way that the control grooves ( 3) are closed at one end (4) and open at their other end (5) and connect at the open end (5) to a bore section (6) of the valve sleeve (1), the diameter (7) of which corresponds approximately to the diameter in the base of the control grooves (3) and is therefore larger than the diameter of the main bore (2) and that on the outer circumferential surface of the valve sleeve (1) in the area of the bore section (6) is a collar (8) with a larger outer diameter arises and that in a second process step the collar (8) is pressed radially inwards by cold forming until the inside diameter of the valve sleeve (1) in this area corresponds to the diameter of the main bore (2) and the inside diameter in the area of the control grooves (3), so that the control grooves (3) are closed at their other end.
3. Verfahren nach Anspruch 2, dadurch g e k e n n ¬ z e i c h n e t , daß die Kaltumformung des ersten Verfah¬ rensschrittes durch Kaltfließpressen erfolgt.3. The method according to claim 2, characterized in that the cold forming of the first method step is carried out by cold extrusion.
4. Verfahren nach Anspruch 2, dadurch g e k e n n ¬ z e i c h n e t , daß die Kaltumformung des zweiten Verfah¬ rensschrittes durch Kaltfließpressen erfolgt.4. The method according to claim 2, characterized in that the cold forming of the second method step is carried out by cold extrusion.
5. Verfahren nach Anspruch 2, dadurch g e k e n n ¬ z e i c h n e t , daß die Kaltumformung des zweiten Verfah¬ rensschrittes durch Rundkneten oder Hämmern erfolgt.5. The method according to claim 2, characterized in that the cold working of the second process step is carried out by kneading or hammering.
6. Verfahren nach Anspruch 1, dadurch g e e n n ¬ z e i c h n e t , daß als Rohling ein Rohrabschnitt verwen¬ det wird und daß die Steuernuten (3) in einem einzigen Verfah¬ rensschritt unter Verwendung eines zerlegbaren und ausfahrbaren Kernes durch Rundkneten oder Hämmern hergestellt werden, derart, daß die beiden Enden der Steuernuten (3) in der Ventilbüchse (1) geschlossen sind.6. The method according to claim 1, characterized in that a pipe section is used as the blank and that the control grooves (3) are produced in a single procedural step using a dismountable and extendable core by kneading or hammering, such that that the two ends of the control grooves (3) in the valve sleeve (1) are closed.
7. Verfahren nach Anspruch 1, dadurch g e k e n n ¬ z e i c h n e t , daß als Rohling ein spanabhebend bearbeitetes, im wesentli¬ chen zylindrisches Teil verwendet wird, in dem die Steuernu¬ ten (3) an deren einem Ende (4) geschlossen und an deren an¬ derem Ende (5) offen sind und an dem offenen Ende (5) an eine Ausnehmung (6) anschließen, deren Durchmesser etwa dem Durchmesser im Grund der Steuernuten (3) entspricht und wobei an der Außenumfangsfläche der Ventilbüchse (1) im Bereich der Ausnehmung (6) ein Bund (8) mit größerem Außen¬ durchmesser vorhanden ist und daß der Bund (8) durch Umformung radial nach innen gedrückt wird, bis der Innendurchmesser im Bereich der Ausnehmung (6) dem übrigen Innendurchmesser des Rohlings und dem Innen¬ durchmesser im Bereich der Steuernuten (3) entspricht, so daß die Steuernuten (3) an ihrem anderen Ende geschlossen sind. 7. The method according to claim 1, characterized ¬ characterized in that a machined, in essence, cylindrical part is used as blank, in which the Steueru¬ ten (3) at one end (4) closed and at the other whose end (5) are open and at the open end (5) connect to a recess (6) whose diameter corresponds approximately to the diameter at the bottom of the control grooves (3) and on the outer peripheral surface of the valve sleeve (1) in the region of the recess (6) a collar (8) with a larger outer diameter is present and that the collar (8) is pressed radially inwards by reshaping until the inside diameter in the area of the recess (6) corresponds to the remaining inside diameter of the blank and the inside diameter in the area of the control grooves (3), so that the control grooves (3) are closed at their other end.
PCT/EP1985/000681 1984-12-21 1985-12-06 Method for producing a single piece valve box for a rotary slide valve WO1986003705A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LUPCT/EP84/00419 1984-12-21
EP8400419 1984-12-21

Publications (1)

Publication Number Publication Date
WO1986003705A1 true WO1986003705A1 (en) 1986-07-03

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WO (1) WO1986003705A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4768268A (en) * 1986-02-24 1988-09-06 Tokai Trw & Co., Ltd. Method for manufacturing a single-piece type valve sleeve
EP0352518A2 (en) * 1988-07-25 1990-01-31 TOKAI TRW & CO., LTD. Method of manufacturing a single-piece valve sleeve
EP0601349A1 (en) * 1992-12-05 1994-06-15 Robert Bosch Gmbh Drillhammer and/or percussion hammer
DE19513634A1 (en) * 1994-10-26 1996-05-09 Leifeld Gmbh & Co Method of mfg. rotationally symmetrical steel workpiece
EP0766015A1 (en) 1995-09-28 1997-04-02 TRW Fahrwerksysteme GmbH & Co. KG Method of manufacturing a housing of a joint
DE19915556A1 (en) * 1999-04-07 2000-10-12 Zahnradfabrik Friedrichshafen Making rotary sleeve valve used in vehicle power steering, employs sheet metal valve shell blank, cut and e.g. laser-welded to shape, chamfered and injection molded with outer plastic control bush
DE4302308B4 (en) * 1993-01-28 2004-02-12 Zf Friedrichshafen Ag Method for producing control grooves in a valve element of a rotary slide valve

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DE102013112123B4 (en) 2013-11-04 2019-09-05 Metaldyne Gmbh Metal sleeve and method for its production
DE102017219038A1 (en) 2017-10-25 2019-04-25 Zf Friedrichshafen Ag Process for the forming production of a metal sleeve with internal grooves closed on both sides and metal sleeve produced herewith
CN113102953B (en) * 2021-04-22 2022-03-15 哈尔滨工业大学 Machining method for improving flow nonlinearity of zero zone of servo valve
CN114102056B (en) * 2021-11-16 2023-11-21 诸暨市红湖机械有限公司 Processing technology of upper flange of valve

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Publication number Priority date Publication date Assignee Title
US2935059A (en) * 1958-09-05 1960-05-03 Earl A Thompson Composite valve tappet assembly
DE2702179A1 (en) * 1977-01-20 1978-07-27 Klein Kg Eugen Internally splined shaft for universal joint - has forged tubular blank with stepped bore pressed on splined mandrel
GB2121326A (en) * 1982-05-22 1983-12-21 Cam Gears Ltd Valve sleeves
DE3413072A1 (en) * 1983-04-06 1984-10-11 Jidosha Kiki Co., Ltd., Tokio/Tokyo METHOD FOR PRODUCING A VALVE SLEEVE

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2935059A (en) * 1958-09-05 1960-05-03 Earl A Thompson Composite valve tappet assembly
DE2702179A1 (en) * 1977-01-20 1978-07-27 Klein Kg Eugen Internally splined shaft for universal joint - has forged tubular blank with stepped bore pressed on splined mandrel
GB2121326A (en) * 1982-05-22 1983-12-21 Cam Gears Ltd Valve sleeves
DE3413072A1 (en) * 1983-04-06 1984-10-11 Jidosha Kiki Co., Ltd., Tokio/Tokyo METHOD FOR PRODUCING A VALVE SLEEVE

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4768268A (en) * 1986-02-24 1988-09-06 Tokai Trw & Co., Ltd. Method for manufacturing a single-piece type valve sleeve
EP0352518A2 (en) * 1988-07-25 1990-01-31 TOKAI TRW & CO., LTD. Method of manufacturing a single-piece valve sleeve
EP0352518A3 (en) * 1988-07-25 1991-01-23 TOKAI TRW & CO., LTD. Method of manufacturing a single-piece valve sleeve
EP0601349A1 (en) * 1992-12-05 1994-06-15 Robert Bosch Gmbh Drillhammer and/or percussion hammer
DE4302308B4 (en) * 1993-01-28 2004-02-12 Zf Friedrichshafen Ag Method for producing control grooves in a valve element of a rotary slide valve
DE19513634A1 (en) * 1994-10-26 1996-05-09 Leifeld Gmbh & Co Method of mfg. rotationally symmetrical steel workpiece
EP0766015A1 (en) 1995-09-28 1997-04-02 TRW Fahrwerksysteme GmbH & Co. KG Method of manufacturing a housing of a joint
DE19536035A1 (en) * 1995-09-28 1997-04-10 Trw Fahrwerksyst Gmbh & Co Method of manufacturing a joint housing
EP0766015B1 (en) * 1995-09-28 1998-12-09 TRW Fahrwerksysteme GmbH & Co. KG Method of manufacturing a housing of a joint
US6044543A (en) * 1995-09-28 2000-04-04 Trw Fahrwerksysteme Gmbh & Co. Kg Method of manufacturing a joint housing
KR100293247B1 (en) * 1995-09-28 2001-11-22 디터펠링스,알로이스제발트 Joint Housing Manufacturing Method
DE19915556A1 (en) * 1999-04-07 2000-10-12 Zahnradfabrik Friedrichshafen Making rotary sleeve valve used in vehicle power steering, employs sheet metal valve shell blank, cut and e.g. laser-welded to shape, chamfered and injection molded with outer plastic control bush

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