DE202010014541U1 - Device for separating a pipe - Google Patents

Abstract

Device for cutting or cutting a tube in which the tube (1) is to be clamped in an upper (2) and a lower (3) matrix combination, the device comprises a separating knife (4) and a rough cutting knife (90 °) ( 5) in a guide slide (6) is fixed, this in a guide groove (7) in the jaws (2, 3) can slide, characterized in that the guide groove (7) in the jaws (2, 3) in the separating direction a broadening learns from a few millimeters, to compensate for the unused guide wall on the front guide side spring elements (10) and on the rear guide side hydraulically actuated piston (8) are provided.

Description

The The invention relates to a device for separating a pipe in order a common and widespread in the pipe separation process with the help of a roughing knife a slot in the pipe wall by passing a cutting knife through this slot and the pipe is to be separated by this. Depending on the depth of the slot are to record different disadvantages.

is For example, the slot is too shallow, d. H. the depth is lower as the wall thickness, so the severing knife the tube well without unwanted Deformations separate, however, it pushes with its wedge-shaped Tip the remaining wall and adjacent areas into the pipe. With progressive penetration of the cutting blade forms on both sides to Cutting knife the chip to be cut out inside the pipe too a role that starts at a certain depth of penetration of the cutting knife forcibly pushed outward by its wedge angle becomes. In this phase, not the cutting knife cuts the pipe, but the rolled chip. It is created at the interface a very large roughening, solving individual particles from the roll-shaped chip and fall into the pipe. Both Apparitions are pronounced quality defects for the cut.

A Enlargement of the slot depth can at least at round tubes solve the problem alone, since the intrinsic stability of the tube forms the boundaries for the slot depth by the tube deforms when the slot depth is exceeded, which is allowed at most on subordinate components is. It is always a defect.

Out The practice is known that there is no at least in round tubes Compromise solution gives a sufficiently large Slit depth connects with a slender cutting knife that the above-described disadvantages are completely eliminated would.

Disadvantages of this type, the in the DE-OS 36 41 886 A1 having device on.

There are devices that do not have the disadvantages described, z. B. DE 100 29 195 C1 , However, these work with an inner die to support pipe stability; but they are not always applicable. Their use fails z. B. in long or curved pipes.

Out the disadvantages mentioned, the invention makes the task, a Device for cutting or cutting tubes to provide ensures that both on the pipe inner wall as well only minimal burr formation occurs on the tube outer wall and the tube remains free of detachment during the cutting process Particles.

These The problem is solved with the preamble of the protection claim 1. Due to the special constructive arrangement in connection with the special procedure of the cutting elements is a burr-less and particle-free separation of pipes and allows flat cut surfaces arise. In the invention Separator is after clamping the tube with the help of the right and left Matrizenkombination first with the 90 ° to Disconnector arranged, located in its rear position Pruning knife is to introduce a groove in the pipe wall, the depth of which only slightly exceeds the wall thickness of the pipe itself. There is a possibility that individual particles can form at the resulting cut edges. In the further As the process progresses, the roughing knife moves with its Guide slide in its middle position and then becomes from its rear to its forward position by means of hydraulic cylinders brought, so that the roughing knife with its front part so far in the transverse groove of the tube protrudes, that now from the tube interior a cut down and the other a cut up can be and the Vorschneidemesser back to its original position located. With the help of spring elements then the Vorschneidemesser brought to its rear position with its guide slide. With the help of the cuts from the inside to the outside, the transverse groove is ready widens that when penetrating the cutting blade, the residual wall thickness is completely peeled off to the outside. The big opening in the pipe wall allows the cutting knife no for Damage prone tip needed and the cutting blade itself be kept comparatively short can. This results in the advantage of a relatively small Trennhubes.

From However, a particular advantage is the fact that in the first cutting process of the roughing knife resulting peaks by the cutting strokes preferably cut away from the inside of the tube downwards and upwards a piece of the pipe wall to the outside is bent.

Further advantageous embodiments of the invention Solution emerge from the dependent claims of Main claim.

The The following embodiment shows the inventive Solution.

The figure shows the arrangement of the roughing knife 5 , the cutting knife 4 , the upper and lower matrices 2 ; 3 , the slider 6 with his guide groove 7 , of the pipe 1 with the transverse groove 9 respectively. widened transverse groove 11 , the hydraulic piston 8th and the spring elements 10 ,

With the help of the upper and lower jaw combinations 2 ; 3 - In the figure, the front jaw for clarity is not shown - is the tube 1 locked against rotation.

The guide slide 6 lies with its rear surface at the cutting knife 4 inclined guide surface of the guide groove 7 at; The pre-cutting knife generates during the pre-cutting 5 first in the pipe wall a transverse groove 9 whose depth is the wall thickness of the pipe 1 itself only slightly exceeds. After that, the guide slide moves 6 with velvet cutting knife 5 far enough back that the pre-cutting knife 5 exactly in the middle of the transverse groove 9 located. Now the hydraulic pistons 8th pressurized, this causes the guide slide 6 for engagement with the front surface of the guide groove 7 so that the roughing knife into the transverse groove 9 without the appreciable contact of the pipe wall in the pipe 1 protrudes. From this position leads the guide slide 6 with the pre-cutting knife 5 a set to the pipe dimension short stroke upwards and widens the transverse groove 9 in the upper area such that an upwardly directed bending approach arises at the pipe wall which is separated out, but which is still firmly connected to the pipe wall. Subsequently, the guide slide moves 6 with the pre-cutting knife 5 into its lower end position and widens the transverse groove 9 down, so now the widened transverse groove 11 originated. In this condition, the pressure on the hydraulic pistons 8th lifted and the spring elements 10 press the guide slide 6 back to its starting position, leaving its rear surface back against the rear guide surface of the guide groove 7 is present, the Vorschneidemesser 5 is located outside of the pipe wall and the guide slide 6 with the pre-cutting knife 5 can be moved to its upper position.

Now the cutting knife drives 4 in the widened transverse groove 11 and peels at the complete cutting of the pipe 1 the rest of the pipe wall completely outwards.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 3641886 A1 [0005]
• - DE 10029195 C1 [0006]

Claims (5)

Device for separating or cutting a pipe in which the pipe ( 1 ) in an upper ( 2 ) and a lower ( 3 ) Matrikenkombination is to clamp, the device is a cutting knife ( 4 ) and a pre-cutting knife arranged at an angle of 90 ° ( 5 ) in a guide slide ( 6 ), this in a guide groove ( 7 ) in the cheeks ( 2 ; 3 ), characterized in that the guide groove ( 7 ) in the cheeks ( 2 ; 3 ) experiences a widening of a few millimeters in the separating direction, to compensate for the unused guide wall on the front guide side spring elements ( 10 ) and on the rear guide side hydraulically actuated piston ( 8th ) are to be provided. Device for separating or cutting a pipe according to claim 1, characterized in that as a drive for the roughing stroke of the guide slide ( 6 ) of the roughing knife ( 5 ) is to arrange a hydraulic cylinder with associated control organs. Device for cutting or cutting a pipe according to claim 1, characterized in that the guide surfaces of the pistons ( 8th ) are slightly spherical perform. Device for separating or cutting a pipe according to claim 1, characterized in that the guide surfaces of the spring elements ( 10 ) are to be provided a slightly spherical shape. Device for separating or cutting a pipe according to claim 1, characterized in that in order to simplify the course of movement of the guide slide ( 6 ) is to arrange a second guide slide with a second roughing knife.

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