DE20107279U1 - Flaring tool - Google Patents

Description

Patent attorneys'· hemmerich Valentin · gihske grosse

11.04.2001 :.vh 78 930

transfluid Maschinenbau GmbH, Hünergraben 20, 57392 Schmallenberg

Flaring tool

The invention relates to a flaring tool for flaring an open pipe end to form a conically projecting flange edge.

The term flanging, which is not clearly defined, refers to the forming of sheet metal between an upper and lower tool, generally without a significant change in the sheet thickness. These processes are used, for example, for profiling or stiffening sheet metal, for forming tubular, rounded or hollow bodies or for rounding or widening workpiece edges such as pipe ends.

In the present case, a press of any design is required, e.g. with hydraulic, pneumatic or spindle drive, which can be expanded to form a flanging device when completed with the flanging tool and can be extended to a powerful fully automatic machine. The special feature of the flanging tool according to the invention compared to previously known flanging tools lies in the design and function of the flanging attachment, and in particular in the interaction between the clamping jaws and the flanging cone as well as the stop mechanism.

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PATENT ATTORNEYS HEMMERICH · VALENTIN GIHSKE GROSSE

The object of the present invention is to provide a flaring tool for expanding a pipe end, which is structurally simple and consists of few machine elements and whose stop mechanism is improved.

The problem is solved in a flaring tool of the type mentioned in the preamble of the claim by a flaring attachment that can be connected to a force means for a pipe end that can be clamped between clamping jaws and pushed forward against a stop that is perpendicular to their axis (x-x), and a flaring cone that can be pushed forward by widening the pipe opening to form the flanged edge and can be guided in a guide bore of the flaring attachment that is coaxial with the clamping jaws.

Embodiments of the flaring tool according to the invention are provided in accordance with the subclaims.

Further details, features and advantages of the invention will become apparent from the following explanation of an embodiment shown schematically in the drawings.

Show it:

Figures 1 to 3 show in section and along a plane passing through the central axis (x-x) of the flanging tool three phases of a flanging process with:

Figure 1 = starting position,

Figure 2 = intermediate position,

Figure 3 = Final or finished position.

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PATENT ATTORNEYS HEMMERICH -VALENTIN ■ GIHSKE GROSSE

Figure 1 shows the flaring tool 1 in the starting position for flaring an open pipe end 1 to produce a conically projecting flanged edge 6 (see Figure 3), in particular in conjunction with a mechanical power device (not shown). This can be a hydraulic press or, for example, a mechanical spindle press, or a kinematic lever press of any design, which only has to be designed with connecting means for attaching the flaring tool 1.

The flaring tool 1 forms a flaring attachment for a pipe end 4 which can be clamped between clamping jaws 2 and pushed forward against a stop 3 located perpendicular to their axis (x-x). In order to widen the pipe opening 5 and form a flanged edge 6, a flaring cone is provided which can be pushed forward with high force and guided in a guide bore 7 coaxial with the clamping jaws 2.

The clamping jaws 2 are designed in two parts with a gap to maintain a distance and are provided with a thickening on the outside for a clamping sleeve that can be pushed on, for example. This ensures that the clamping jaws 2 are applied to the pipe to be deformed in a force-fitting manner when the clamping sleeve is advanced and, when a counterforce occurs from the flaring cone 12, they grip even more firmly and hold the pipe in position.

In a further expedient embodiment, the clamping jaws have a conical recess 8 provided for shaping and receiving the flanged edge 6 to be formed.

In a further embodiment, the flaring tool 1 according to the invention provides that the functionally important stop 3, by which the advance of the pipe from the feed side is stopped, is a slide 17, which is displaceable perpendicular to the axis (x-x) with the advance force of a spring 9 in a transverse position to the axis (x-x).

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PATENT ATTORNEYS* HEMMERICH VALENTIN GIHSKE GROSSE

the guide 10. The slide 17 can be supported flexibly on the flaring cone 12 by means of a conical surface 11 formed at its end (see Fig. 2).

This achieves an automatic mechanism in which, as the axial movement of the flaring cone 12 progresses, the stop 3 is simultaneously displaced from its locking position relative to the edge 6 of the pipe to be flared and the flaring cone 12. And finally, one design of the flaring tool provides that the stop mechanism 16 is tiltably mounted in a pivot point 18 in such a way that the finished flared pipe end 4 - seen in the top view of Figure 3 - can be moved out of the guide bore 7 to the right against the flaring cone 12, or in the case of the design of the flaring attachment 1 shown, can be moved out of the flaring attachment 1 together with the clamping jaw arrangement 2 to the left. When the flaring cone 12 is moved out to the right through the guide bore 7, it is necessary to lift the locking pin 14 in the flaring block 13 from its locking position in the longitudinal groove 15 in order to clear the way for moving out the flaring cone 12. The design of the flaring tool according to the invention is surprisingly uncomplicated and practical.

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Patent attorneys' hemmerich 'valentin · gihske grosse

11.04.2001 :.vh 78 930

List of reference symbols

1. Flaring attachment 2. Clamping jaws 3. attack 4. Pipe end 5. Pipe opening 6. Beaded edge 7. Guide hole for flaring cone 8th. conical recess 9. Feather 10. transverse guide 11. conical contact surface 12. Flaring cone 13. Flaring block 14. Locking pin 15. Longitudinal groove 16. Stop mechanism 17. Slider

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Claims (5)

1. Flaring tool for flaring an open pipe end to a conically projecting flanged edge, characterized by a functional unit of interacting elements with: - a flaring attachment ( 1 ) connectable to a force means for a pipe end ( 4 ) which can be clamped between clamping jaws ( 2 ) and pushed forward against a stop ( 3 ) perpendicular to their axis (xx), and, - a flaring cone ( 12 ) which can be pushed forward to widen the pipe opening ( 5 ) and form the flaring edge ( 6 ) and which can be guided in a guide bore ( 7 ) of the flaring attachment ( 1 ) which is coaxial with the clamping jaws ( 2 ). 2. Flanging tool according to claim 1, characterized in that the clamping jaws ( 2 ) are formed in at least two parts with a spacing gap and are formed on the outside with a conical thickening for a clamping sleeve that can be pushed on, for example. 3. Flanging tool according to claim 1 or 2, characterized in that the clamping jaws ( 2 ) in the region of the pipe end have a conical recess ( 8 ) designed to form and receive the flanged edge ( 6 ). 4. Flanging tool according to one or more of claims 1 to 3, characterized in that the stop ( 3 ) is a slide ( 17 ) which is displaceably mounted perpendicular to the axis (xx) of the flanging tool with the advancing force of a spring ( 9 ) in a guide ( 10 ) which is transverse to the axis (xx), and which can be supported in a flexible, sliding manner on the flanging cone ( 12 ) with a conical surface ( 11 ) formed at its end. 5. Flanging tool according to one or more of claims 1 to 4, characterized in that the stop ( 3 ) is pivotally mounted in a pivot point ( 18 ).