NL1025692C1 - Bending machine for bending strips, plates, profiles, around material and thick-walled pipe. - Google Patents

Abstract

The machine for bending metal exercises a clean bending moment on the two ends of the area to be bent. It does not need a template to produce the desired radius. In some versions, one side of the product is tensioned statically and in others, both sides to be bent undergo the bending movement. Both the control levers and bending arms are symmetrical and synchronized. The radius can be set by adjusting the angle between the arms.

Description

Bending machine for bending strips, plates, profiles, around material and thick-walled pipe.

5 Text: Figure 1

This is a bending machine for bending strip, square, pipe and other profiles that have a consistent cross-section.

The machine exerts a pure moment on the product that is clamped in the terminals H and H 'to be able to bend it in any radius.

10 On drawing page 1 the bending process is shown in four steps.

Figure 1-A shows the product for the deformation that is clamped in both clamps.

Figure 1-B shows the bent product when the clamps are rotated 60 degrees relative to each other.

Figure 1-C shows the bent product when the clamps are rotated 120 degrees relative to each other.

Figure 1-D shows the curved product when the clamps are rotated 180 degrees with respect to each other.

The terminals H and H 'can move freely from and towards each other in the direction X.

Text: Figure 2

On this page we see the principle of the bending machine in three positions.

In figure 2-A we see that the machine consists of two symmetrical parallelograms.

The parallelogram A, B, C, D has a fixed pivot point F.

The parallelogram A ', B', C ', D' has a fixed pivot point F '.

The synchronization mechanism between the two arms A and A 'consists of the tooth segments that form an integral part with arm A and A', respectively. These two tooth segments are in engagement with each other.

v *. "1 0256 QX_ _ 2

The terminals H and H 'can move freely to the right and left, but are mutually symmetrically synchronized.

The entire machine is symmetrical with respect to the axis S

All pivot points are mounted in such a way that minimal friction is created.

The clamps H and H 'are fixedly mounted on the arms D and D' respectively.

The angular rotation exerted on arms C and C 'causes an equal angular rotation on the terminals H and H' via the arms A and B and A 'and B', which can be seen in Fig. 2-B.

If the arms C and C 'are moved, the result is that a pure moment is exerted on the product clamped between the clamps H and H "(see also figure 1-C).

By exercising this pure moment, the product will assume a pure radius.

IS Figure 2-C shows that an integral tooth segment on the operating levers C and C 'ensures that the movements of these levers are synchronized.

This tooth segment is omitted in Fig. 2-A since otherwise the tooth segments of the levers A and A 'would not be visible.

20

Text figure 3

If one wants to bend a long product, e.g. a long hydraulic tube it is important that one part of the product is static.

A fundamental solution for this is described in figure 3 On this page the bending process is shown in 4 steps.

Figure 3-A shows the system with clamped material for the deformation. Figure 3-B shows the system with clamped material and a deformation of 30 degrees.

Figure 3-C shows the system with clamped material and a deformation of 60 degrees.

1025692 3

Figure 3-D shows the system with clamped material and a deformation of 90 degrees.

The pivot point F of the arm J and the clamp H 'are fixed points.

The protruding part of the product 0 that is clamped in terminal H 'is static.

S The starting point of the bending machine consists of two parallelograms marked G, J, I, K and marked N, Μ, K, L.

The element K connects the two parallelograms at an angle of approx.

90 degrees.

The first parallelogram, marked G, J, I, K transmits the moment from arm J to element K and can move completely freely in the direction Q-R.

Parallelogram, marked N, Μ, K, L, transfers the moment from element K to arm N and can move completely freely in the direction S-T.

Terminal H is fixedly mounted on the arm N.

The direction of movement (Q-R and U-T) of the two parallelograms Onderling 15 remains approximately 90 degrees.

The moment is thereby transferred from arm J to terminal H which is thus free to move in the horizontal plane.

As a result, clamp H only experiences a pure moment based on negligible friction in all pivot points.

If a pure moment is exerted on the product between the two clamps (H and H '), the product will deform evenly (bend) with an even radius.

A condition for this bending process is that the product to be bent has a constant cross-section over the length to be bent.

The angle P which arm J makes around point F is equal to the angle that terminal H makes.

The radius that the product receives depends on the distance between the two terminals H and H 'in the starting position and the angle that terminal H makes.

Because both the angle va and the distance between the two clamps (H and H ') are infinitely variable, any radius and bending angle is possible.

1025692 4

Since a parallelogram consisting of two arms has a practical angle limitation of approximately 100 degrees, a three (or more) armed structure is used in practice (e.g. a "Schmidt Offset Coupling") to arrive at a larger bending angle. The operating principle remains the same when using such an alternative.

The task of the construction with several parallelograms is to transfer a pure moment from the fixed clamp H 'to movable clamp H.

1025692

Claims (8)

1- A bending machine that can exert a pure moment on a product by means of mechanical parallelograms so that that product is bent with a uniform radius between the two clamps. S 2- A bending machine for bending profiles that are symmetrical with respect to the bending surface. 3- A bending machine according to point 2, which can make a large angle up to approximately 200 degrees. 4- By using 2 or more parallelograms in this bending machine a pure moment is transferred to the two clamps. 5- A bending machine according to item 3, however, with a plurality of parallelogram arms, for example in the form of a "schmidt offset coupling" to enable a greater angular rotation of the clamp. 6- All pivot points are mounted in such a way that minimal friction is created. 15 7- A bending machine according to 5, however, one clamp is fixed and the other can move freely in one plane. 8- A bending machine according to 4, wherein the movement of the two clamps is symmetrical and synchronized. 1025692