FR2470647A1 - DEVICE FOR SECTIONING THE TERMINAL AND INITIAL PARTS OF STRIPS OF MATERIAL, FOLLOWING THE ASSEMBLY OF THE TWO STRIPS IN THEIR CUTTING PLANS - Google Patents

Abstract

WHEN BELT 5 IS EXTRACTED FROM THE FEEDER AND ENTERS THE SECTIONING DEVICE, THE PRESS IS STOPPED. THE DOUBLE ROLLER TURNS 180, SO THAT A SECOND BAND DESIGNATED BY 5A IS DRAWN INTO THE SECTIONING DEVICE, ENOUGH AWAY FOR ITS DEFECTIVE INITIAL PART TO ARRIVE BEYOND THE LASER HEAD 6. THE CUT IS THEN CARRIED OUT BY THE LASER HEAD 6 IN THE SENSE OF ARROW 7, FOLLOWING WHICH THE END PARTS 8 OF BOTH STRIPS 5 AND 5 FALL. AFTER THE CUT, THE TWO BANDS 5 AND 5A ARE CLOSED AND ALIGNED. AT THIS TIME IS PERFORMED, WITH THE SAME LASER HEAD 6 IN THE SENSE OF ARROW 12, THE WELDING PROPERLY SAID.

Description

The invention relates to a device for cutting the parts

  terminal and initial of material strips, followed

  of the assembly of the two bands in their cutting planes.

For example when shaping strips of material in presses, it is necessary to shorten the ends to a certain extent at the beginning and at the end of these strips. This involves removing parts without sharpness, which are inevitably produced during the manufacture of the strips. For the cutting of these end parts, we know shears said to be trimming. In addition, efforts are made to

  as quickly as possible the introduction of the immediate strip-

  following, after shaping the previous strip, in order to minimize the machine downtime,

  for example the press. In this regard, it has proven, in part

  especially in the case of wide bands, that the threading of the band improvement in the press frequently encounters great difficulties, in particular in the case where they are relatively thin bands, the end of which has more or less trendy

to flex laterally.

  To remedy this, it has already been proposed to provide interposed welding stations upstream of the press, these stations being arranged following the shearing machine. With this known device, the end portion of the previously shaped strip and the initial portion of the immediately following strip are sectioned, then the cutting planes of these strips are brought together to then be joined together by welding, by electrical example. However, under these conditions, relatively high tensions occur in the joint of the two strips, as well as protruding beads in the weld bead, which in turn can cause operating incidents, for example.

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example in a stage press equipped with following tools. In addition, with these known welding devices, which operate electrically or in a gas envelope, the parts cut out in the region of the joint cannot be used as workpieces. Another drawback of this known device also consisted in the fact that it was two machines completely separate from each other and subsequently joined in a

  together which took a relatively large place.

This is where the present invention comes into play, which starts from a device for cutting the terminal and initial parts of strips of material, followed by the assembly of the two strips in their cutting planes, and which aims to achieve

  this device so that we can perform successively-

  with it, on the one hand, an exact sectioning, then a welding giving a bead of precision welding which, on the one hand, does not protrude over the thickness of the sheet and, on the other hand, gives rise to considerably reduced tension in

the assembly area, in comparison with the known welding process.

  To achieve this goal, it is proposed according to the invention

  tion a device of the kind defined in the preamble, characterized by a laser device which is movable perpendicular to the longitudinal direction of the strips and which is produced on the one hand in the form of a cutting device and, on the other hand, under

form of welding device.

For the transition from the sectioning operation to the operation

welding ration, there are different possibilities. According to the invention, two will be mentioned: this is how it is for example possible that the power supply, necessary for the laser beam, is controllable and adjustable depending on the operating phases "cutting" and "welding". According to another embodiment, the speed of movement of the cutting head is controllable and adjustable at will under the

  dependence on the "cutting" and "welding" operating phases.

Furthermore, it may be advantageous to have a common laser device for "cutting" and for "welding". But it is also possible to have a separate laser device for each of the "cutting" and "welding" operations in

the common device.

  The invention is explained in more detail in

  using drawings which represent, partly in schematic form

tick, an exemplary embodiment chosen arbitrarily.

Fig. 1 shows, in a schematic side view, a device associated with a press.

  Fig. 2 is a top view of two end parts

mite strips of material before the cutting operation.

Fig. 3 is a view similar to that of FIG. 2, the two cutting surfaces following the cutting operation

  being joined by their joints before the welding operation.

  Fig. 4 shows, in a schematic side view,

the cutting head before welding.

In fig. 1, a double reel has been designated by 1, by 2 the device according to the invention for the sectioning of the terminal and initial parts of the strips of material, followed by the assembly of the two strips in their cutting planes, by 3 a device of dressage and by 4 a press. The strip of matter

is designated by 5.

  The device 2 according to the invention operates from the

next way.

  When the strip 5 for example is extracted from the double reel 1 by its end part and enters the device 2, the press 4 is stopped. At the same time, the double reel 1 rotates 1800 around a vertical axis, so that a second strip reaches the starting position. This strip is designated by 5a in FIG. 2 and she is also drawn into

  device 2, far enough for its initial part to defect

  killer arrives beyond the actual laser head 6. The cut is then carried out by the laser head 6 in the direction of the arrow 7, after which the end portions 8 of the two strips 5 and 5a fall and are discharged, for example, as indicated in fig. 1, along inclined planes 10 towards a waste container 11. After cutting, the two strips 5 and a are brought together and aligned, by a transverse displacement of one of them or one and the other, so that their cutting surfaces are pressed against each other, as shown in fig. 3. At this time, with the same laser head 6 in the direction of arrow 12, the welding is carried out

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  well said. Then the press can be restarted. The control elements, necessary for the passage of "sectioning"

  to "welding" r are neither described in detail nor shown.

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Claims (5)

- CLAIMS -   1. Device for sectioning the finished parts   initial and initial strips of material, followed by the assembly of two bands in their cutting planes, characterized by a provision laser device (6) which is movable perpendicular to the direction   longitudinal section of the strips (5) and which is produced on the one hand in the form of a cutting device and on the other hand in the form of welding device.   2. Device according to claim 1, characterized in that the power supply, necessary for the laser beam, is controllable and adjustable at will depending on the phases "cutting" and "welding" procedures. 3. Device according to claim 1, characterized in that the speed of movement of the cutting head is controlled lable and adjustable at will according to the operating phases "cutting" and "welding".   4. Device according to any one of the claims   1 to 3, characterized in that a common laser device is provided for "cutting" and "welding".   5. Device according to any one of the claims 1 to 3, characterized in that a separate laser device for each "cutting" and "welding" operations are arranged in the dispo- common sitive.