MXPA96006482A

MXPA96006482A - Rolling self-positioning support for your bending paramachines

Info

Publication number: MXPA96006482A
Application number: MXPA/A/1996/006482A
Authority: MX
Inventors: Caporusso Alessandro; Caporusso Mario
Original assignee: Cml Costruzioni Meccaniche Liri Srl
Priority date: 1995-12-15
Filing date: 1996-12-16
Publication date: 1997-08-01

Abstract

The present invention relates to a tube bending machine comprising a bending assembly with a die and a counter-die, a support arm and a mandrel for positioning a tube, wherein the arm is pivotally and rotatably supported with respect to the assembly of bending through a pivot supported slidably along a projection on a first vertical axis passing through the center of rotation of the matrix and the center of rotation of the counter-matrix, so as to automatically position an axis horizontal on one side that has to be debled in the machine on the first vertical axis in such a way as not to vary a distance between the first vetical axis and the mandrel when the bra is positioned

Description

ROTATION SELF-POSITIONING SUPPORT FOR PIPE BENDING MACHINES.

D E S C R I P C I O N The present invention relates in general to tube bending machines and the like, such as beam benders and ring bending machines.

More particularly, the present invention relates to tube bending machines that have the bending system with the counter-array assembly that rotates to the position in which the pushing forces of the matrix and the counter-matrix go to contact with the tube that is going to bend in the bending start stage.

With the tube bending machines present with the counter-rotating matrix system the tube support is made for example on a support or on a plane, where the tube is rested, or even the tube is cantilevered between the die and the counter-matrix, without any support, with difficulty in executing the bending operation. Furthermore, with these solutions there is no possibility of mounting a member to control the tube in its displacement and rotation in the bending step, as is done by the mandrel which, on the contrary, is mounted on the arm to support the tube in systems of the type with a non-rotating counter-array assembly such as those with which the present invention relates, or to control the "zero" fixed point of radial movement of the tube and therefore of the support.

THE INVENTION The general object of the present invention is to provide, for a tube bending machine of the aforementioned type, an arm for supporting the tube, in order to be able to equip that machine with a mandrel to guide and control the tube in the step of bent. However, in tube bending machines of the type to which the present invention relates, turning at the beginning of the bending of the counter-array assembly results in a corresponding angular displacement of the tube to be bent before it reaches the true stage of bending.

A particular object of the present invention is to provide an arm for support of that type of machine that is capable of following the rotation of the tube in the stage at the beginning of the bending with a pivot at zero and which, at the same time, is rigid and responsive to the movement of the tube sufficiently for the purpose of precision.

By "zero" we mean here the intersection of the axis of the tube to be bent with the straight line through the centers of rotation of the matrix and of the rotation of the counter-matrix assembly.

That object is achieved, in accordance with the teachings of the present invention by providing the tube support arm with a rotating structure that pivots about zero.

The machine thus configured, ie the machine with a pivot around zero, allows in an absolute manner not to vary the distance "x" between the zero point and the mandrel in the self-positioning stage of the rotating support. This distance is necessary in order to be able to predetermine the linear projections of the mandrel for the execution of a part according to the drawing. In addition, when the rotary support pivoted on the axis through the zero, it slides on the perpendicular of the axis through the center of the matrix and the center of rotation of the counter-matrix, which allows to leave the work field without removing the tube of the machine to allow the replacement of the matrix with another of a different radius as is required by the drawing, without losing the predetermined heights on the linear and rotational axes.

With this structure, one has the advantage that a support arm will only be a means of support; it does not have to be loaded by itself with the forces that appear at the beginning of bending stage and a light structure can be provided for this. The machines made according to the teachings of the present invention, whose operation is the same as that according to the prior art of the rigid type, that is to say with a non-rotating counter-array assembly and a support arm which is fixed from a rigid way, a + a if it is placeable, has a reduced weight of the order of quintals, up to the order of tens of kilograms, in which the lateral contrast thrust in the bending stage in the rotational system is completely supported by the set of rotary counter-matrix.

Following the rotation of the counter-array assembly and the consequent of the tube axis, the support arm itself goes to its position according to which the configuration of the machine will follow in the true bending start stage.

The present invention will be much better understood on the basis of the following detailed description of its preferred embodiment, given only by way of example, absolutely without restriction, with reference to the accompanying drawings, in which: Figure 1 is a top plan view of the tube bending machine according to the present invention; Y Figure 2 is a side view of the machine of Figure 1.

The machine comprises a bending assembly 1 and a tube support arm 2, on which it is placed on mandrel 3. The assembly 1 comprises a pulley die 4 with flanged groove and a counter-die 5.

The support arm 2 is pivotably articulated to the bending assembly 1 through a first pivot 6, which has its integral axis with the bending assembly and is cantilevered in relation to the counter-array assembly through a projection 7 supporting it by means of a block 8, where the first pivot 6 is directly mounted. The projection 7 ends beyond the block 8 with a circular projection 71. With this construction the pivot 6 always lies on itself on the perpendicular of the axis through the center of the matrix-center of rotation of the countermatrix group and on the axis of the folded down tube.

Therefore, the arm is always pivoted to an end on this pivot. In addition, it is supported rotatably by two articulations 9, 10 connected to each other and the second with the arm through pivots, a second and a third 11, 12. The articulation 9 with one end is fixedly connected to the body of the machine of a fixedly, for example by means of screws 17 and at the other end rests on the base through adjustable screws 18 for leveling. The function of this articulation 9 is to ensure the stability to the machine and the length of the latter as a function of the length of the arm 2.

With this construction the arm is perfectly capable of following the rotation at the beginning of bending due to the rotation of the counter-array assembly.

The positioning of the pivot 6 is a function of the bend radius that one wishes to print to the tube, that is to say the radius of the matrix. A screw 5 may penetrate the surface of the projection 7, screwed in a respective hole, to fix the correct sliding position of the first pivot 6.

The aforementioned circular projection 7 • is provided to prevent the block 8 from sliding out of the projection 7.

The construction is completed with rollers 13 configured as a function of the tube or beam to be guided and supported on both vertical and horizontal axes so that they are disposed at the pivoting end of the support arm 2, which rollers are adjustable to hand as a function of the diameter of the tube.

In addition, the arm 2 is supported on the articulation 10 through the linear guide of the rollers 16 (see figure 2) which make possible the pivoting movement on the third pivot 12.

The rotation of the articulation 10 is restricted by the stops made by the rollers 15 sliding on rails in respective grooves of a gauge 15 *, centered on the second pivot 11 in order to restrict the idle stroke of the articulation.

The present invention has been described and illustrated with reference to a preferred embodiment, although it will be expressly understood that variations, additions and / or omissions may be made, without departing from its teachings. Therefore, the scope of protection remains only defined by the clauses that are attached. For example, the support arm may also be supported on the non-pivoted end on a roller wheel on the base.

Still, the movement set 10-11-12 can be doubled, tripled or multiplied in general in order to support higher weights and arms.

Claims

R E I V I N D I C A C I O N S

1. - Machine for bending tubes comprising a bending set, a support arm and a mandrel for placing a tube, characterized in that: the arm is pivotally and rotatably supported with respect to the bending set by means of a pivot supported slidably at length of a projection on the axis that passes through the center of rotation of the matrix and the center of rotation of the counter-array, so that it automatically positions itself on its axis in the vertical through the axis of the tube, that is to say on the zero, in order not to vary the distance between the zero and the mandrel in the self-positioning stage of the rotating support.

2. - Pipe bending machine according to clause 1, further characterized in that: the support arm is supported by two joints, one fixedly attached to the bending assembly and the other pivoted through a third pivot with the arm itself, and pivoted between yes through a second pivot, and to compensate for the rotation of the second joint, the third pivot is connected to the support arm through means that allow a linear reciprocation and a relative rotational movement with the arm itself; The fixed joint ensures the stability of the machine and its length is a function of the length of the arm.

3. - Tube bending machine according to clause 1 or 2, characterized in that it comprises adjustable rollers to align the tube or beam on the axis of the arm, at the pivoting end of the arm.

4. - Tube bending machine according to clause 3, characterized in that the alignment rollers have a groove configured in such a way as to restrict the tube horizontally and vertically.

5. - Tube bending machine according to any of the preceding clauses, characterized in that it comprises groove stops for idle stroke for the angular stroke of the second joint, fixable in position in a gauge centered on the second pivot. SUMMARY A tube bending machine comprising a bending set (1) and a support arm (2), wherein the arm is pivotally and rotatably held in relation to the bending set through a pivot (6), slidably supported along a projection (7) on the axis passing through the center of rotation of the matrix and the center of rotation of the counter-array assembly, in order to automatically place itself on the zero.