DE102005015642A1 - Notching process for end of tube involves piercing tube wall with pre-cutting punch from inside along unsupported part sector of outline - Google Patents

Abstract

The notching process for the end of a tube involves placing the end of the tube (7) in a die (5) and using an outline cutting punch (8) from the outside. The tube wall is first pierced with a pre-cutting punch (3) from the inside, along an unsupported part sector of the outline. The outline cutting punch now only has to complete the process.

Description

TECHNICAL TERRITORY

The The present invention relates to a method and an apparatus for notching a contour at the end of a pipe received in a die with a contour cutting punch corresponding to the die from the outside of the pipe.

STATE OF TECHNOLOGY

Appropriate Methods and devices are known and are used if one pipe at an angle to another, continuous workpiece, at which may also be a pipe, in particular shall be. By notching arises at the end of angezusetzenden Tube corresponding to the outer contour of the continuous workpiece Recess.

Opposite one Production of the recess e.g. by filing or milling out the notching especially when larger numbers usually more efficient, but in practice it finds its limitation through the wall thickness of the machining pipe. For thick walls, it can namely to a deformation of the pipe come because the front part of the pipe wall, on which the contour cutting punch first hits when notching, is not supported by the die in Ausklinkrichtung.

PRESENTATION THE INVENTION

task The invention is a method and an apparatus of the initially specify type, with which also pipes with thicker walls without undesirable Edit deformation.

Regarding of the method, this object is achieved by the in the claim 1 indicated characteristics. The inventive device is in the claim 6 marked.

Of the Essence of the invention is therefore that the pipe wall before the actual notching executed with the contour cutting punch, with a Vorschneidstempel from the tube inside along one when notching with the contour cutting punch through the die unsupported Part of the contour cut against the support by the die becomes.

Of the Part section, along which the pipe wall with the Vorschneidstempel is severed, located in any case at the front of the pipe wall in the sense defined above and, with optimal placement, even exactly at the point at which the contour cutting punch following on the pipe wall hits. By the pipe wall is already severed there is, it sets the contour cutting punch no great resistance more contrary. The peak load that otherwise occurs during cutting is avoided. The contour cutting punch only has to cut further. The tube is loaded little, so that there are no raw deformation can.

In the rule is enough it, if cut with the Vorschneidstempel a tongue in the pipe wall and something is squeezed out of the pipe wall. The pre-cut stamp does not have to drive through the front of the raw wall completely.

According to one preferred embodiment the invention are the front and the contour cutting punch along the same trajectory are and are also moved together. Between the cutting the front part of the pipe wall with the roughing punch in the first step and the notching of the desired Contour with the contour cutting punch in the subsequent, second step the direction of movement of both stamps must be reversed. When Consequence of the coupled movement of both punches is in the second step the Vorschneidstempel the back in the direction of release part of the pipe wall drive through before the contour cutting punch.

at the inventive Device, the front and the contour cutting punch are preferred mounted on the same punch holder, which can be moved in a frame guided is. In the same frame can also be used the die.

After all can the inventive device even with a clamping device for fixing the tube in be provided with the die.

SHORT EXPLANATION THE FIGURES

The Invention is intended below with reference to embodiments in connection closer to the drawing explained become. Show it:

1 in section, a device according to the invention and for carrying out the inventive method with a pipe clamped therein with not yet unlatched pipe end;

2 the device of 1 after pre-cutting the pipe end with a pre-cutting stamp;

3 the device of 1 after notching the pipe end with a contour cutting punch;

4 in perspective view of the pipe after the pre-cutting;

5 in perspective view of the pipe after the notching;

6 under ac) the contour cutting punch in different views and d) in an end view together with a punch holder a tube; and

7 under ac) the Vorschneidstempel itself in different views and d) in an end view together with a punch holder and an already notched pipe.

WAYS TO PERFORM THE INVENTION

In the 1 - 3 illustrated device has a stable frame, which consists of a lower frame part 1 and an upper frame part 2 is composed. In the lower frame part 1 is a stamp holder 2 guided linearly movable in the manner of a carriage. In the upper frame part is a die 5 used. In this from the top to the punch holder is inserted a tube 7 that of a jig 6 additionally still held and fixed.

The stamp holder 2 carries, in passports each firmly screwed, on the one hand a Vorschneidstempel 3 and on the other hand, a contour cutting punch 8th , The two stamps 3 and 8th aligned in the direction of movement of the punch holder 2 together. Their form is in each case several views a) -d) in the 6 and 7 illustrated. On their sides facing each other are the pre-cutting 3 and the contour cutting punch 8th with a sharp, protruding cutting edge 3.1 respectively. 8.1 Mistake.

The shape of the contour cutting punch 8th is chosen so that when notching at the lower end of the pipe 7 an arcuate contour K results, as in 5 is shown. The pipe 7 For example, it can be connected to another tube (not shown) with a round cross-section at a right angle. The arcuate contour K is also in the 6d) and 7d) to recognize.

The cutting edge 3.1 of the precut punch 3 is designed to be as in 7 d) recognizable, along a partial section T of the contour K runs. The partial section T is arranged in the central region of the contour K and thus around the point at which the cutting edge 8.1 at the contour cutting punch 8th protrudes the most. In 1 This has the consequence that the top edges of the pre-cutting 3 and the contour cutting punch 8th at the same level as the lower edge of the die 5 aligned.

The pre-cut stamp 3 is further dimensioned so that it is in the pipe 7 with a little game fits. On his from the contour cutting stamp 8th applied side, he is also provided with cutting edges, but overall much rounder than executed on his against the contour cutting punch 8th directed page.

The notching takes place with the device described above in two steps, starting from a position of the punch holder 2 as in 1 shown. In this initial position, the pre-cutting punches 3 in the pipe 7 or in the lower, ausklinkendes end a.

In the first step, the punch holder 2 in the in 2 shifted position shown, with the front part 7.1 the pipe wall through the Vorschneidstempel 3 with its cutting edge 3.1 is severed locally, including along the mentioned section T and there against the support through the die 5 ,

In the second step, the punch holder 2 in the opposite direction in the 3 moved position shown. This is initially a precontour in the back 7.2 the pipe wall of the pipe 7 through the precut punch 3 unlatched according to the outer contour and again against the support by the die 5 , Only then comes the contour cutting punch 8th with the front part 7.1 the pipe wall in contact with it, with his cutting line 8.1 exactly in the region of the mentioned subsection T impinges on the pipe wall. With regard to the current direction of movement of the contour cutting punch, which is also referred to above as the notching direction 8th is the pipe wall in this area through the die 5 not supported. In addition, occurs in this phase by cutting the pipe wall usually a high peak load. By the tube wall is already cut through the pre-cutting here, this peak load is avoided. The contour cutting punch 8th needs to release the contour K in the front part 7.1 just cut the pipe wall further.

After disengaging the desired contour K from the front part 7.1 the pipe wall passes through the contour cutting punch 8th If necessary, also the rear part 7.2 the pipe wall to here the to release the same contour K. This is far less critical, because in this case the pipe wall through the die 5 is supported again. In addition, a large piece of the pipe wall has already been previously disengaged by the Vorschneidstempel.

For the above-described effect of reducing the load when notching the desired contour K from the front part 7.1 As a rule, it is sufficient for the pipe wall if the precut section T of the contour K is comparatively short and out of the front part 7.1 the pipe wall only a small tongue 7.3 is pushed out, like this 4 shows.

The Invention is self-evident not limited to round tubes in cross-section. The inventive concept is also applicable to oval or angular ones. Also, the shape the contour basically any. In the training of Vorschneidstempels is only make sure that the pre-cutting is done there, if possible where to expect at notches without pre-cutting the largest loads would be and / or where the pipe is at least supported by the die. An adaptation to different tube cross sections or shapes is in the above-described device by replacing the die and the stamp just possible. By e.g. slope Arrangement of the tube axis opposite the movement path of the stamp holder pipes can be unlatched so, that they are under a weird Angle e.g. can be connected to another pipe.

1

lower frame part

2

punch holder

3

Vorschneidstempel

3.1

cutting edge at the precutation stamp

4

upper frame part

5

die

6

jig

7

pipe

7.1

front Part of the pipe wall

7.2

rear Part of the pipe wall

7.3

tongue

8th

Contour cutting punch

8.1

cutting edge on the contour cutting punch

K

auszuklinkende contour

T

part Of the contour K

Claims (9)

Method for notching a contour (K) at the end of a die (in a die) 5 ) received pipe ( 7 ) with one with the ( 5 ) corresponding contour cutting punch ( 8th ) from the outside of the pipe, characterized in that the pipe wall is previously provided with a rough cutting punch ( 3 ) from the inside of the pipe along a notching with the contour cutting punch ( 8th ) through the die ( 5 ) unsupported portion (T) of the contour (K) against the support by die ( 5 ) is severed. A method according to claim 1, characterized in that the partial section (T) comprises the point or the section in which the contour cutting punch ( 8th ) on the pipe ( 7 ) hits in the notching. Method according to one of claims 1 or 2, characterized in that with the rough cutting punch ( 3 ) a tongue ( 7.3 ) is cut free in the tube wall and pushed out of the tube wall. Method according to one of claims 1-3, characterized in that the pre- ( 3 ) and the contour cutting punch ( 8th ) are guided along the same movement path and are moved together, wherein between the cutting of the pipe wall with the rough cutting punch ( 3 ) and the notching with the contour cutting punch ( 8th ) the direction of movement is reversed. Method according to claim 4, characterized in that the pre-cutting punch ( 3 ) when notching the rear part in the notching direction ( 7.2 ) of the pipe wall in front of the contour cutting punch ( 8th ) passes through. Device for notching a contour (K) at the end of a pipe ( 7 ) with a pipe ( 7 ) receiving die ( 5 ) and one from the outside of the pipe against the pipe ( 7 ) movable contour cutting punch ( 8th ), characterized in that they are inserted into the pipe ( 7 ) from the said end engaging pre-cutting punch ( 3 ), with the tube ( 7 ) from the inside of the pipe along a notching with the contour cutting punch ( 8th ) through the die ( 5 ) unsupported portion (T) of the contour (K) against the support by die ( 5 ) is severable. Apparatus according to claim 6, characterized in that the pre- ( 3 ) and the contour cutting punch ( 8th ) on a punch holder ( 2 ) are mounted. Apparatus according to claim 7, characterized in that the punch holder ( 2 ) in a framework ( 1 . 4 ) is guided displaceably, in which also the die ( 5 ) is used. Device according to one of claims 6-8, characterized in that a tensioning device ( 6 ) for fixing the tube ( 7 ) in the die ( 5 ) is available.