SE518440C2 - Device for cutting tubular profiles - Google Patents

Description

5218 440 which a guide pin 21 from the frame 11 extends to prevent rotation of the cutting unit 40 but allow a radial movement of the cutting unit 40. Four spring-loaded pins 22-25 are recessed in the cutting holder 15 and have sliding surfaces 41 against the inner surface of the flywheel 12. 42 and these pins center the cutting unit 40 in the flywheel 12. The springs not shown in the figures thus actuate the pins 22-25 in abutment against the inner surface 42 of the flywheel 12 while the cutting unit 40 is centered relative to the flywheel 12.

The flywheel 12 has a projection 30 which extends into a recess 31 in the mantle surface of the cutting holder 15. The protrusion 30 is axially separated from the centering resilient pins 22-25 so that it does not collide with the pins 22-25 when the flywheel 12 rotates in the manner to be described.

The frame 11 carries a cylindrical support 33 which is carried by a long rod 34 which, for example, connects to a tube-forming machine.

The diameter of the support member 33 is adapted so that the tube 35 to be cut runs freely on the outside of the support member 33 and the inner diameter of the cutting unit 40 is adjusted so that the tube runs freely inside the cutting unit.

The support member 33 has an outer surface 43 and an end edge 44 which together serve as cutting abutment or abutment cutting insert 45.

When the tube 35 is in place for cutting, the motor 13 is started so that the flywheel 12 begins to rotate. The guide pin 21 prevents the cutting unit 40 from rotating and therefore the projection 30 will rise out of the cooperating recess 31 and force the cutting unit 40 out of its centered normal position in which it is coaxial with the flywheel 12 and with the support member 33 so that the cutting insert 16 will cut a jack in the periphery of the tube 35. When the flywheel 12 then continues to rotate, it will via the projection 30 force the cutting unit 40 into an eccentric movement so that the cutting insert 16 will continuously by cooperation with the abutment cutting insert 45 extend the cutting jack in the tube 35 until the flywheel 12 rotates a full turn and the tube 35 thereby is completely cut off.

The support member 33 itself receives support against the frame 11 during the cutting operation. The eccentric movement of the cutting unit 40 must be so large that the tube 35 is cut off even at the projection 30 and the recess 31. One can, for example, have an eccentric movement which gives a cutting distance of 30-40 mm for a tube with a diameter of 100 mm .

The support member 33 which supports the abutment cutting insert 45 thus takes support against the frame 11 during the cutting. When changing to a smaller pipe diameter or other pipe profile, replace the support member 33 and the cutting insert 16 with those of the desired diameter and insert an inner ring into the frame 11 so that there is such play between the support member 33 and the inner ring of the frame 11 that the tube can be inserted therebetween for subsequent clipping.

In this way, the cutting edge of the pipe becomes smooth and perpendicular to the center axis of the pipe. No goods are cut off and therefore there can be no chips in the pipe.

Conveniently, the pipe cutting device shown can be built together with a machine which continuously manufactures the pipe 35. When manufacturing a folded sheet metal pipe, one can fold the pipe around the rod 34 and temporarily stop the production when the intended length of pipe is to be cut off.

It will be appreciated that the detailed design of the pipe cutting device described above can be varied in many different ways within the scope of the inventive concept.

As an example of this, it can be mentioned that the centering of the cutting unit 40 and the eccentric movement of the just mentioned cutting unit can be effected in a number of different ways in addition to what is shown here.

The pipe cutting device can easily be adapted or adjusted to different pipe profiles of different dimensions and it can be used for cutting / cutting both open and closed pipe profiles of both circular shape and of another shape.

The invention is thus not limited to what is shown and described, but changes and modifications are of course possible within the scope of the appended claims.

Claims (5)

10 15 20 25 518 440 PATENT CLAIMS Device for cutting pipes (35) comprising an external cutting unit (40) and an internal support member (33) for the pipe, the cutting unit (40) being annular and arranged coaxially with the support member (33), wherein means are arranged to guide out the cutting unit (40) from coaxiality with the support member (33) and giving it an eccentric movement so that the cutting unit (40) on a lap eccentric movement cuts off a tube (35) located outside the support member (33) and inside the cutting unit (40), characterized by that the device comprises a ring (12) arranged around the cutting unit (40) and resilient means (22-25) for pouring the cutting unit centered in the ring, and that the ring (12) and the cutting unit (40) have cooperating means (30,3l). ) which on rotation of the ring from a rest position with the cutting unit (40) centered in the ring (12) leave each other and give the cutting unit (40) its eccentric movement. Device according to claim 1, characterized in that said cooperating means consist of a recess (31) and a projection (30), the projection being arranged on the ring (12). Device according to Claim 1 or 2, characterized in that the device comprises a guide pin (21) which prevents the cutting unit (40) from rotating. Device according to one of Claims 1 to 3, characterized in that an end portion (45) of the support member (33) serves as an abutment cutting insert (45). Device according to one of Claims 1 to 4, characterized in that the resilient members consist of spring-loaded pins (22-25).