CH647967A5

CH647967A5 - Method of producing a chamber-shaped circular recess in a connecting element

Info

Publication number: CH647967A5
Application number: CH4728/80A
Authority: CH
Inventors: Florian Andreolla
Original assignee: Baumgartner Merzia
Priority date: 1980-06-19
Filing date: 1980-06-19
Publication date: 1985-02-28

Abstract

A chamber-shaped circular recess is made from below in the hollow polygonal head (1) of a connecting element. This is done in a single operation by means of a single cutting tool (10). First of all the cutting tool (10) is guided perpendicularly to the longitudinal axis (X) of the connecting element into the starting cut at the thread end (3a) of the screw shank (2). The cutting tool (10) is then guided parallel to the longitudinal axis (X) of the connecting element into the base surface (1a) of the polygonal head (1). A guide surface is thus obtained which adjoins the thread end (3a) of the screw shank (2) and merges without obstacles into the wall of the circular recess (4). The mounting of the sealing ring is thereby simplified, because it can be inserted along this guide surface into the circular recess (4) without damage and without difficulty. <IMAGE>

Description

**WARNUNG** Anfang DESC Feld konnte Ende CLMS uberlappen **. ** WARNING ** beginning of DESC field could overlap end of CLMS **.

PATENTANSPRÜCHE 1. Verfahren zur Herstellung einer kammerförmigen Kreisaussparung in einem einen hohlen Mehrkantkopf und einen hohlen mit ihm einstückigen Schraubenschaft aufweisenden Verbindungselement zum Einschrauben in eine Leitung oder in einen Apparat, wodurch ein geschlossener Druckmedium-Umlaufkreis gebildet wird, wobei die Kreisaussparung zur Aufnahme eines Dichtungsringes bestimmt ist, dadurch gekennzeichnet, dass ein Schneidwerkzeug (10) in einem einzigen Arbeitsgang zuerst senkrecht zur Längsachse (X) des Verbindungselementes in den Anschnitt am Gewindeende (3a) des Schraubenschaftes (2) und anschliessend parallel zur Längsachse (X) des Verbindungselementes in die Bodenfläche (la) des Mehrkantkopfes (1) geführt wird, wonach es aus der vollendeten Kreisaussparung (4) zurückgezogen wird. PATENT CLAIMS 1. A method for producing a chamber-shaped circular recess in a connecting element having a hollow polygonal head and a hollow screw shank that is integral with it, for screwing into a line or into an apparatus, whereby a closed pressure medium circulation circuit is formed, the circular recess being intended for receiving a sealing ring , characterized in that a cutting tool (10) in a single operation first perpendicular to the longitudinal axis (X) of the connecting element into the cut at the threaded end (3a) of the screw shank (2) and then parallel to the longitudinal axis (X) of the connecting element into the bottom surface ( la) of the polygonal head (1), after which it is withdrawn from the completed circular recess (4).

2. Verfahren nach Patentanspruch 1, dadurch gekennzeichnet, dass das Schneidwerkzeug (10) beim Zurückziehen aus der Kreisaussparung (4) parallel zur Längsachse (X) des Verbindungselementes geführt wird und kurz vor seiner Null-Stellung eine zusätzliche Bewegung senkrecht weg von der Längsachse (X) des Verbindungselementes ausführt. 2. The method according to claim 1, characterized in that the cutting tool (10) when withdrawing from the circular recess (4) is guided parallel to the longitudinal axis (X) of the connecting element and shortly before its zero position, an additional movement perpendicularly away from the longitudinal axis ( X) of the connecting element.

Die Erfindung geht aus von einem Verfahren zur Herstellung einer kammerförmigen Kreisaussparung in einem einen hohlen Mehrkantkopf und einen hohlen mit ihm einstückigen Schraubenschaft aufweisenden Verbindungselement zum Einschrauben in eine Leitung oder in einen Apparat, wodurch ein geschlossener Druckmedium-Umlaufkreis gebildet wird, wobei die Kreisaussparung zur Aufnahme eines Dichtungsringes bestimmt ist. The invention is based on a method for producing a chamber-shaped circular recess in a connecting element having a hollow polygonal head and a hollow screw shank that is integral with it, for screwing into a line or into an apparatus, whereby a closed pressure medium circulation circuit is formed, the circular recess for receiving a sealing ring is determined.

Ein solches Verbindungselement weist einen hohlen Mehrkantkopf und einen hohlen, mit dem Mehrkantkopf einstückigen Schraubenschaft auf. Such a connecting element has a hollow polygonal head and a hollow screw shaft which is integral with the polygonal head.

Der Schraubenschaft des Verbindungselementes weist am Gewindeende (in der Nähe des Mehrkantkopfes) einen Anschnitt auf, der vom Werkzeug beim Schneiden des Gewindes bedingt ist. The screw shank of the connecting element has a chamfer at the thread end (near the polygonal head), which is caused by the tool when cutting the thread.

Es ist bekannt, in die durch das Gewindeende und die Bodenfläche des Mehrkantkopfes eingeschlossene Ecke unter einer Neigung von 450 eine Aussparung zu schneiden, in welche der Dichtungsring eingelegt wird. Eine solche Aussparung hat aber durch stumpfen Winkel gebildete Kante, die für den Dichtungsring bei dessen Einführen in die Kreisaussparung eine Verletzungsgefahr darstellt. It is known to cut a recess in the corner enclosed by the threaded end and the bottom surface of the polygonal head at an inclination of 450, into which the sealing ring is inserted. However, such a recess has an edge formed by an obtuse angle, which represents a risk of injury for the sealing ring when it is inserted into the circular recess.

Es ist auch bekannt, die Kreisaussparung in der Bodenfläche des Mehrkantkopfes auf solche Weise auszuführen, dass der Anschnitt am Ende des Gewindes der Schraube belassen wird und in die Bodenfläche des Mehrkantkopfes eine Kreisaussparung ausgeschnitten wird. Wenn aber der Dichtungsring nicht optimal nach den Ausmassen der Kreisaussparung dimensioniert ist, können die Metallteile des Verbindungselementes und des zu verbindenden Teiles nicht aufeinanderkommen und der in eine solche Kreisaussparung eingesetzte Kreisring wird so stark deformiert, dass er bald zerstört wird. Ausserdem kann auch in diesem Fall der Dichtungsring bei seinem Einführen in die Kreisaussparung durch die Kante der Kreisaussparung beschädigt werden. It is also known to make the circular recess in the bottom surface of the polygonal head in such a way that the gate is left at the end of the thread of the screw and a circular recess is cut out in the bottom surface of the polygonal head. If, however, the sealing ring is not optimally dimensioned according to the dimensions of the circular recess, the metal parts of the connecting element and the part to be connected cannot come into contact with one another and the circular ring inserted into such a circular recess is deformed so much that it will soon be destroyed. In addition, the sealing ring can also be damaged by the edge of the circular recess when it is inserted into the circular recess.

Die Montage des Dichtungsringes ist schwierig. The assembly of the sealing ring is difficult.

Der im Patentanspruch 1 angegebenen Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Herstellung einer kammerförmigen Kreisaussparung im Verbindungselement vorzuschlagen, in welchem eine solche Kreisaussparung hergestellt wird, die eine Führungsfläche für den Dichtungsring aufweist, damit er in die richtige Stellung ohne seine Verletzung eingeführt werden kann. Eine solche Aussparung soll weiter die Verwendung von laufend erhältlichen Dichtungsringen ermöglichen. Die Kreisaussparung soll mit einem einzigen Schnittwerkzeug hergestellt werden. The invention specified in claim 1 is based on the object of proposing a method for producing a chamber-shaped circular recess in the connecting element, in which such a circular recess is produced which has a guide surface for the sealing ring so that it can be inserted into the correct position without being injured . Such a recess should further enable the use of sealing rings that are currently available. The circular cutout should be made with a single cutting tool.

Diese Aufgaben werden bei dem im Oberbegriff des Patentanspruches 1 angezeigten Verfahren auf solche Weise gelöst, dass das Schneidwerkzeug in einem einzigen Arbeitsgang zuerst senkrecht zur Längsachse des Verbindungselementes in den Anschnitt am Gewindeende des Schraubenschaftes und anschliessend parallel zur Längsachse des Verbindungselementes in die Bodenfläche des Mehrkantkopfes geführt wird, wonach es aus der vollendeten Kreisaussparung zurückgezogen wird. These tasks are solved in the method indicated in the preamble of patent claim 1 in such a way that the cutting tool is first guided perpendicularly to the longitudinal axis of the connecting element in the cut at the threaded end of the screw shank and then parallel to the longitudinal axis of the connecting element in the bottom surface of the polygonal head in a single operation after which it is withdrawn from the completed circular recess.

Die Erfindung wird nachstehend anhand der Zeichnung näher erläutert. Die einzige Figur zeigt eine Ansicht eines Teiles des Verbindungselementes und ein Schnittwerkzeug, mittels welchen eine Kreisaussparung in dem Verbindungselement hergestellt wird. The invention is explained below with reference to the drawing. The single figure shows a view of a part of the connecting element and a cutting tool, by means of which a circular recess is made in the connecting element.

Das Verbindungselement weist einen hohlen Mehrkantkopf 1 und einen hohlen Schraubenschaft 2 auf, die mit dem Mehrkantkopf 1 einstückig ist. Der Mehrkantkopf 1 weist eine Bodenfläche la auf, die sich in der Nähe des Gewindeendes 3a des Gewindes 3 des Schraubenschaftes 2 befindet. Das Verbindungselement wird in eine Leitung oder in einen Apparat zur Herstellung eines geschlossenen Druckme dium-Umlauikreises eingeschraubt. The connecting element has a hollow polygonal head 1 and a hollow screw shank 2, which is integral with the polygonal head 1. The polygonal head 1 has a bottom surface 1 a, which is located in the vicinity of the thread end 3 a of the thread 3 of the screw shaft 2. The connecting element is screwed into a line or into an apparatus for producing a closed pressure medium umlauik circuit.

Ein in der Figur schematisch dargestelltes Schneidwerkzeug 10 wird in einem einzigen Arbeitsgang zuerst senkrecht zur Längsachse des Verbindungselementes in den Anschnitt am Gewindeende 3a des Schraubenschaftes 2 geführt. Dieser Anschnitt entsteht beim Schneiden des Gewindes 3 des Schraubenschaftes 2. Das Schneidwerkzeug 10 wird anschliessend parallel zur Längsachse des Verbindungselementes in die Bodenfläche la des Mehrkantkopfes 1 geführt. A cutting tool 10, shown schematically in the figure, is first guided in a single operation, perpendicular to the longitudinal axis of the connecting element, into the cut at the threaded end 3a of the screw shaft 2. This cut occurs when the thread 3 of the screw shaft 2 is cut. The cutting tool 10 is then guided parallel to the longitudinal axis of the connecting element into the bottom surface 1 a of the polygonal head 1.

Durch diese Verfahrensschritte entsteht im Mehrkantkopf 1 des Verbindungselementes eine kammerförmige Kreisaussparung 4, die zur Aufnahme eines nichtdargestellten Dichtungsringes bestimmt ist. Through these process steps, a chamber-shaped circular recess 4 is created in the polygonal head 1 of the connecting element, which is intended to receive a sealing ring (not shown).

Beim Zurückziehen des Schneidwerkzeuges 10 aus der vollendeten Kreisaussparung 4 wird es parallel zur Längsachse (X) des Verbindungselementes geführt. Mit Vorteil kann das Schneidwerkzeug 10 beim Zurückziehen aus der Kreisaussparung 4 kurz vor seiner Null-Stellung eine zusätz- liche Bewegung senkrecht weg von der Längsachse (X) des Verbindungselements ausführen, um die Kante der Kreisaussparung anzufassen. When the cutting tool 10 is withdrawn from the completed circular recess 4, it is guided parallel to the longitudinal axis (X) of the connecting element. When withdrawing from the circular recess 4 shortly before its zero position, the cutting tool 10 can advantageously carry out an additional movement perpendicularly away from the longitudinal axis (X) of the connecting element in order to grip the edge of the circular recess.

Somit entsteht eine sich an das Gewindeende 3a des Schraubenschaftes 2 anschliessende Führungsfläche, die von dem Gewindeende 3a in die Wand der Kreisaussparung ohne Hindernisse übergeht. Dadurch wird die Montage des Dichtungsringes vereinfacht, weil er in die Kreisaussparung 4 ohne Verletzung über die Führungsfläche eingeführt werden kann. Als Dichtungsringe können im Handel laufend erhältliche Dichtungsringe verwendet werden. Die Kreisaussparung 4 wird mit einem einzigen Schneidwerkzeug hergestellt. This creates a guide surface adjoining the threaded end 3a of the screw shaft 2, which merges from the threaded end 3a into the wall of the circular recess without obstacles. This simplifies the assembly of the sealing ring because it can be inserted into the circular recess 4 without injury via the guide surface. Commercially available sealing rings can be used as sealing rings. The circular recess 4 is produced with a single cutting tool.

Claims

PATENT CLAIMS

1. A method for producing a chamber-shaped circular recess in a connecting element having a hollow polygonal head and a hollow screw shank that is integral with it, for screwing into a line or into an apparatus, whereby a closed pressure medium circulation circuit is formed, the circular recess being intended for receiving a sealing ring , characterized in that a cutting tool (10) in a single operation first perpendicular to the longitudinal axis (X) of the connecting element into the cut at the threaded end (3a) of the screw shank (2) and then parallel to the longitudinal axis (X) of the connecting element into the bottom surface ( la) of the polygonal head (1), after which it is withdrawn from the completed circular recess (4).

2. The method according to claim 1, characterized in that the cutting tool (10) when withdrawing from the circular recess (4) is guided parallel to the longitudinal axis (X) of the connecting element and shortly before its zero position, an additional movement perpendicularly away from the longitudinal axis ( X) of the connecting element.

The invention is based on a method for producing a chamber-shaped circular recess in a connecting element having a hollow polygonal head and a hollow screw shank that is integral with it, for screwing into a line or into an apparatus, whereby a closed pressure medium circulation circuit is formed, the circular recess for receiving a sealing ring is determined.

Such a connecting element has a hollow polygonal head and a hollow screw shaft which is integral with the polygonal head.

The screw shank of the connecting element has a chamfer at the thread end (near the polygonal head), which is caused by the tool when cutting the thread.

It is known to cut a recess in the corner enclosed by the threaded end and the bottom surface of the polygonal head at an inclination of 450, into which the sealing ring is inserted. However, such a recess has an edge formed by an obtuse angle, which represents a risk of injury for the sealing ring when it is inserted into the circular recess.

It is also known to make the circular recess in the bottom surface of the polygonal head in such a way that the gate is left at the end of the thread of the screw and a circular recess is cut out in the bottom surface of the polygonal head. If, however, the sealing ring is not optimally dimensioned according to the dimensions of the circular recess, the metal parts of the connecting element and the part to be connected cannot come into contact with one another and the circular ring inserted into such a circular recess is deformed so much that it will soon be destroyed. In addition, the sealing ring can also be damaged by the edge of the circular recess when it is inserted into the circular recess.

The assembly of the sealing ring is difficult.

The invention specified in claim 1 is based on the object of proposing a method for producing a chamber-shaped circular recess in the connecting element, in which such a circular recess is produced which has a guide surface for the sealing ring so that it can be inserted into the correct position without being injured . Such a recess should further enable the use of sealing rings that are currently available. The circular cutout should be made with a single cutting tool.

These tasks are solved in the method indicated in the preamble of patent claim 1 in such a way that the cutting tool is first guided perpendicularly to the longitudinal axis of the connecting element in the cut at the threaded end of the screw shank and then parallel to the longitudinal axis of the connecting element in the bottom surface of the polygonal head in a single operation after which it is withdrawn from the completed circular recess.

The invention is explained below with reference to the drawing. The single figure shows a view of a part of the connecting element and a cutting tool, by means of which a circular recess is made in the connecting element.

The connecting element has a hollow polygonal head 1 and a hollow screw shank 2, which is integral with the polygonal head 1. The polygonal head 1 has a bottom surface 1 a, which is located in the vicinity of the thread end 3 a of the thread 3 of the screw shaft 2. The connecting element is screwed into a line or into an apparatus for producing a closed pressure medium umlauik circuit.

A cutting tool 10, shown schematically in the figure, is first guided in a single operation, perpendicular to the longitudinal axis of the connecting element, into the cut at the threaded end 3a of the screw shaft 2. This cut occurs when the thread 3 of the screw shaft 2 is cut. The cutting tool 10 is then guided parallel to the longitudinal axis of the connecting element into the bottom surface 1 a of the polygonal head 1.

Through these process steps, a chamber-shaped circular recess 4 is created in the polygonal head 1 of the connecting element, which is intended to receive a sealing ring (not shown).

When the cutting tool 10 is withdrawn from the completed circular recess 4, it is guided parallel to the longitudinal axis (X) of the connecting element. When withdrawing from the circular recess 4 shortly before its zero position, the cutting tool 10 can advantageously carry out an additional movement perpendicularly away from the longitudinal axis (X) of the connecting element in order to grip the edge of the circular recess.

This creates a guide surface adjoining the threaded end 3a of the screw shaft 2, which merges from the threaded end 3a into the wall of the circular recess without obstacles. This simplifies the assembly of the sealing ring because it can be inserted into the circular recess 4 without injury via the guide surface. Commercially available sealing rings can be used as sealing rings. The circular recess 4 is produced with a single cutting tool.

** WARNING ** End of CLMS field could overlap beginning of DESC **.