DE1452836C3 - Bending tool - Google Patents

Description

3 4

on, the radius of which is expediently the thickness of the points 32 with the projections 5 in contact

sheet to be bent is the same. On either side of it, it causes the projections to reject.

Cutting edge 2 is a projection 3 in each case and a hydraulic or pneumatic

arranged that the to operate these projections and the cal control valve SO, which is known in

At the end of 2 of the punch 1 applied tangents t acts in a 5 way on the control circuits of the brake press.

Include angle α that the bending to be generated

angle is essentially the same. The flanks 4 are shown in FIG. 6 by the fact that one

of the punch 1 are in each case with respect to the tangent t jumps 5 each through a parallel to the punch 1

set back and have about in their middle against light bundle 60 replaced. As soon as the sheet metal 30 is

A certain forward deformation in the area 32, which is slightly set back over the tangent

Cracks 5, which in a first embodiment form a fraction of the light bundles 60 each over-

of the invention covers optical energy applied to insulating substrates 6, optical energy occurs

are brought. The projections 5 can, however, also receive devices in operation and act in known

by any other known means electrically ter way on the control circuits of the brake press.

isolated or formed by switches. 15 It is well understood that the invention is not based on the

The bending die 10 shown in Fig. 2 has limited various embodiments,

compared to those used in conventional bending technology, without departing from the scope of the invention

the dies did not reveal any particularity. a different arrangement is to be provided in particular,

The bending point shown in FIG. 3 at the end of the bending as shown, for example, in FIG. 7 is shown. the

Process is shown, comprises three areas in which 20 punch 1 there comprises a cutting edge or working

nen deformation takes place: edge 2 and two protrusions 5, which in place of the

One between the edges 11 of the die 10 and projections 3 are arranged in such a way that the main part clamped to the cutting edge 2 of the punch 1 is attached to these projections and to the cutting edge 2, respectively zone 31, as well as two secondary zones 32, the respectively applied tangents t enclose an angle α , between the cutting edge 2 and the one projection 3 25 of the punch 1 to be generated in the essential punch 1 on the one hand and the one edge 11 of the surface is the same. The projections 5 can, on the other hand, be clamped as in the die 10. Previously described examples as electrical Konin the main area 31, the elastic limit clocks or interrupter or as hydraulic or of the sheet metal 30 has been exceeded, and its pneumatic valves are designed. The degree of cold deformation can also be replaced by stretching the outer 30 with light barriers, the Ar fibers of which have been increased. Has been described in the secondary preparatory mode in the foregoing.
Chen 32, however, the elastic limit of the sheet metal has not been reached, and the degree of cold deformation described above, the relative movement of the two has remained unchanged, since the projections 5 lower legs of the bent sheet metal 30 use. When electrically connected to one another, as soon as the 35 one takes into account the fact that the punch 1 when penetrating the die 10 reduces the bending symmetry of the tool on the one hand and the bending angle α of the sheet metal 30 until the or fold on the other hand is perfect, sheet metal 30 can only be touched by a single control at points 32 according to the invention. Thereupon pulls a member shown in Figure 4, which can optionally be placed on the front relay 40 on its armature and opens a contact 40 or on the back of the press 41 in the circuit of the drive for the closing movement.

movement of the bending press and opens a contact 42 in the case of a simplified embodiment of the ErStromkreis of the drive for their opening movement are shown in FIG. 8 the control elements for the supply. automatic shutdown omitted. The stamp 1

As a result, the elastic deformations are identical only: in its lower area gene that when the punch 1 is withdrawn from the area a working edge 2, the radius of which is expediently reduced 10 become free in areas 32, which is elastically equal to the thickness of the sheet to be bent, see deformations, those of the permanent deformation and a projection on both sides of it 3. tion of the area 31 are superimposed and in this the projections 3 are arranged so that each Area become free. 50 to a protrusion and to the cutting edge 2 of the stem

By expedient choice of the mutual position pels I applied tangents close an angle a one of the working edges 2 and 3 of the punch 1, the Kan, which - as in FIG. 1 shown - the to th 11 of the die 10 as well as the position and the generating bending angle is the same.
Height of the contacts 5 at the withdrawn In this case, the bending point comprises, as above, sections 4 of the stamp 1 can be written in three areas: the main specification and automatic compensation of the fluctuations rich 31 and two secondary areas 32, in which in the Properties of the sheets, in particular their elastic limit is not exceeded.
Achieve thickness and thus also a constant one - an expedient selection of the mutual bending angles. Position of the working edges 2 and 3 of the stamp 1 and

A modified embodiment of the invention 60 of the edges 11 of the die 10 ensures a

tion results from FIG . 5, if one has the preliminary exact compensation and consequently one despite

5 jumps at right angles to the movement of the considerable fluctuations in the quality of the sheet metal -

Sheet 30 designed to be movable. If the sheet metal 30 at permanent bending angle.

1 sheet of drawings

Claims (8)

1 2, .. there is an essentially linear relationship between claims: see the sheet metal thickness and the resulting angle of the bend or fold. Fluctuations in 1. Press brake tool whose punch can with a degree of cold deformation if it is within in the cross-section of the V-shaped recess of the body 5 of one and the same sheet metal delivery occur, substantial sink interacts, thereby resulting in characteristic angle deviations. the shows that the flanks (4) of the punch quality of the bend resulting from impact bending (1) each withdrawn in one area is far superior, but requires a three-to-one are, the bending force in the cross-section at the end of the fillet five times greater than the free bending. tion of the working edge (2) begins and extends up to io. The invention relates to a tool which ^{extends after 1} ^ a projection (3 or 5), ¹ which also works. shaped recess of the Ge. makes it possible to achieve an accuracy that is at least equal to the area of the impact bending process opposite the die sink (10), the punch lies. ^: ■■■ ^; and that requires a significantly lower bending force 2. folding tool according to claim 1, characterized 15 changes, without the working accuracy of the countermarking that of the projections min- * ^; ^ depends on the skill of the operator. .
The tool according to the invention comprises a piece, (30) cooperating signal transmitter (5) V-shaped bending die and a bending punch, deseines control circuit * for stopping the lowering flanks are withdrawn and electrical, edging tool (1, 10) actuating press or the like is designed as hydraulic, pneumatic or optical control members which are arranged in such a way that 3. Press brake tool according to claim 1 or 2, it automatically through. Shutting down the machine characterized in that the projections (3 interrupt the bending process as soon as the desired ( or 5) are arranged in such a way that the angle is reached. The invention is further characterized both on the working edge (2) and each marked a 25 that the punch at his Protrusion applied tangents (i) has an angle flanks protrusions, each together Include (α), the angle of the to be produced with the cutting edge or working edge of the bending tool end Chamfer-at least almost the same. "· '■ pels form a bending die, on the other hand the edge 4. Bending tool according to claim 1, characterized in that \ the V ^ shaped bending die acts as a bending punch, marked that. at least between 30, α The control elements are for the shutdown a projection (3) and the working edge (2) between the cutting edge and the projections of the with the beveled workpiece (30) together "stamp on its back-taking flanks volume-acting signal transmitter (S, 60) of a control ■ arranged. : ■. . ·: .. · .. circle for stopping the bending machine, however, remains within the scope of the gener (1, 10) actuating press or the like. Provided if you only have the punch with an arm is. working edge and two protrusions on the flanks, 5. Press brake tool according to claim 4, characterized in that it has no control element for the automatic shutdown, that the or each signal transmitter turns. It is also possible without the scope of the (S, 60) opposite to leave the working edge (2) and invention to the withdrawn the corresponding projection (5) applied 40 flanks of the stamp control elements for the self-tangent (?) is slightly reset. . term stoppage to be provided without the stamp v ^{! i} '° 6. Bending tool ^{: has} projections on either side of its working edge. : \ t. "- Proverbs 2 to 5, 'characterized in that the The invention is described below on the basis of or each signal transmitter has a different design (■ pel (1) is electrically .isolated contact pieces (5). 45 examples explained in more detail. It shows " 7. Press brake tool according to one of the on 'Fig. 1 a.! Cross section of an with electrical speak 2 to 5, characterized in that the contacts provided stamp,. or each signal transmitter an actuator (5) F i g. 2 a cross section through the bending die, of a hydraulic or pneumatic valve Fig. 3 shows a cross section through the entire bending (50) is. ■■ - .. ■ ·>. · _5o ggyygj- ^ gjjg during the bending process, 8. folding tool according to claim 4 or 5, F i g. 4 shows the electrical circuit diagram of the control unit marked that the or each Si- direction, signal transmitter a light barrier (60) with to the Ar- F i g. 5 shows a cross section through a bending tool beitskante (2) parallel light beam. . with hydraulic or pneumatic control 55 during the bending process, F i g. 6 a cross-section by means of light —R controlled bending tool during the Bending process, 7 shows a cross section through an electrical Tools for bending or folding 60 shear contacts controlled bending tool with usual sheet metal include a V-shaped bending die and chemical bending punch and a bending punch of complementary shape. The- _ F i g. 8 shows a cross section through stamps and similar Tools are either used to bend a bending tool without a control element for the gen (pliage »en l'air«) or automatic stop for impact bending, but with protrusions (pliage »en frappe«) used. The goodness of 65 the flanks of the stamp. resulting in the first-mentioned method. In the illustrated embodiments of the supply depends in particular on the thickness and the invention has the bending punch 1 at its lower degree of cold deformation of the bent sheet metal. Each part has a cutting edge or working edge 2