FR2727882A1 - UNIVERSAL TOOLS FOR PRESS BRAKE - Google Patents

Abstract

The present invention relates to an adapter for mounting tools on a press brake, consisting of a bar-shaped body having a first heel specific to a given type of press brake and able to cooperate with the table or the upper apron. of said press brake, and a means for fixing the tool, consisting of a central heel (6) specific to the tool.

Description

UNIVERSAL TOOLS FOR BENDING PRESSES.

  The present invention relates to

  tools for press brakes.

  It is known that the tools of presses intended to allow the bending of metal sheets generally consist of a punch removably mounted on an upper deck and by a die removably mounted on a table. The punch and the matrix cooperate with each other by forcing between them the sheet to bend, the punch having a projecting part whose profile corresponds substantially to that of the notch made opposite in the matrix. When the upper deck is actuated, generally by hydraulic cylinders, the sheet engaged between the two tools undergoes deformation

  according to a more or less pronounced fold.

  The punches and dies are fixed by different means known and specific to each manufacturer of press brakes. Among these means, bolt systems, flange systems, or even

  organs of hydraulic or pneumatic brigades.

  By way of example, French patent FR2598946 describes a device for fixing a punch or a die on the apron of a press brake or on an intermediate tool holder. The punch or the matrix comprises a median heel having a profile delimited by two lateral faces, at least one of which is inclined on the axial plane of the punch or of the matrix which coincides with the axial plane of the deck. The apron has a longitudinal groove receiving the heel which engages with play in the latter, the heel being delimited on each side of the punch or of the die by planar bearings coming to bear against the

face opposite the apron.

Such devices have

  the disadvantage of being specific to a type of press

  folder given. It is therefore necessary to have for

  each machine has its own collection of tools.

  Managing a fleet of disparate folders is

difficult and expensive.

  We therefore sought to allow the use of non-specific tools on different types of

  press brakes using adapters.

  For this purpose, the French patent FR2540756 is known in the prior art. This patent relates to an adapter for mounting, on the apron of a press brake, punches having fixing heels of different types. The body of this adapter consists of a bar or a series of bar sections, suitable for being fixed on the apron of the corresponding press, and the lower part of which, on one of its vertical faces, has a further recess greater depth than the heel for fixing a punch, whatever the type of this heel. Furthermore there is provided a support wedge of the same height as that of the abrading of the body of the adapter and which is capable of being placed against the heel of the punch to be fixed in place, ie in the bottom of the abrading. of the body of this adapter, ie on the external side. The fixing in place of this wedge and the heel of the corresponding punch is ensured by a flange tightened by screwing on the body of the adapter and disposed on the side towards which the recess in this body is open. Thus, this adapter makes it possible to mount, on the deck of a press brake of a given brand, punches whose fixing heels are designed to be adapted to

presses of different brands.

  Such an adapter is not entirely satisfactory. Indeed, assembly and disassembly are

  tedious and require laborious adjustment.

  The object of the present invention is to remedy this drawback by proposing an adapter and associated tools which are easy to install and

  offering great resistance and reliability.

  To this end, the invention relates more particularly to an adapter for mounting tools on a press brake, consisting of a rod-shaped body having a first heel specific to a given type of press brake and capable of cooperating with the table or the upper deck of said press brake, and a tool fixing means, characterized in that the tool fixing means is constituted by a central heel

specific to tooling.

  This heel makes it easy to position the complementary groove of a punch or a die. he

  guarantees a good distribution of efforts.

  Preferably, the central heel specific to the tool is centered relative to a plane

  longitudinal containing the axis of the folding thrust.

  Advantageously, the adapter according to the invention has longitudinal bearing surfaces on either side of the central heel specific to the tool. According to a particular embodiment, the central heel specific to the tool comprises at least one protruding element at rest, suitable for cooperating with a

groove provided on the tool.

  According to a first variant, the central heel specific to the tool comprises a rotary longitudinal locking member between a disassembly position in which it disappears inside the heel, and a locking position in which it forms its own projection to cooperate with a groove provided on the tool. According to a second variant, the locking member consists of a cylindrical rod

  with a longitudinal flat.

  According to a third variant, the heel of the adapter has a plurality of protruding members at rest and retractable to allow the installation of the tool, the adapter further comprising a movable means for blocking all of the protruding members in the protruding position for blocking all the tools after their installation on the adapter. This locking means can be constituted by a rod with a flat acting on the inner end of the projecting members, by means of an elastically compressible connecting piece, for example a spring. This variant makes it possible to mount several punches or elementary dies on an adapter, these being held in position provisionally by the cooperation between the projecting members at rest and the rib of the groove, and then being locked in block during actuation of the locking rod in the locking position in which it prevents the retraction of the projecting members. The invention also relates to a punch and a die for cooperating with an adapter having at their connecting part a longitudinal groove whose section is complementary to the section of the heel of the adapter. According to a preferred embodiment, the longitudinal groove has a lateral hollow rib for receiving the projecting blocking element of the

adapter heel.

  According to an advantageous variant, the punch and the die have a lateral cavity for the introduction of a handling spindle. This brooch

  allows you to handle the tools without risk of injury.

  According to another advantageous variant, they have a longitudinal bore of hexagonal section

  for the connection of several juxtaposed tools.

  The invention will be described in the following according to a non-limiting example of embodiment, referring to the accompanying drawings o: - Figure 1 shows a sectional view of the tool; - Figure 2 shows an enlarged view of a variant adapter heel; - Figure 3 shows a sectional view

of a variant of matrix.

  FIG. 1 represents a view in median section of the tool consisting of an upper adapter (1), a punch (2), a die (3) and a

lower adapter.

  The upper adapter (1) has at its upper part (5) a heel whose section is determined to allow mounting on the upper deck of a press brake of a specific type. The opposite face has a heel (6) of rectangular section centered with respect to the folding thrust axis (7). On either side of this heel (6), the adapter has shoulders (8, 9) whose surface extends in the plane perpendicular to the thrust axis (7). The heel (6) has a longitudinal bore (10) of cylindrical shape opening on the lateral face (12) of the heel by a rectangular window with a height less than the section of the bore (10). Inside this bore (10) is placed a rod (11) of cylindrical shape having a

  flat (13) of rectangular shape.

  The punch has at its part opposite the lip (14) a central groove (15) having on one of the lateral faces a rib (16). The position of this rib (16) corresponds to the position of the window opening on the bore (10). When the flat (13) is oriented towards the window, it is in the plane of the lateral face of the heel (6) and the punch can be moved in the direction of the axis (7), in order to remove it or to implement. When the rod (11) is rotated 180, it projects through the window and the projecting part is housed in the rib (16)

of the groove (15) of the punch (2).

  When the punch (2) is in position in the adapter (1), the upper edges come to rest on the shoulders (8, 9) of the adapter (1) and the lower edge (17) of the heel comes '' press on the flat bottom of the groove (15). The punch (2) has a longitudinal bore (21) with a polygonal section, allowing the passage of a connecting rod intended for the coupling of several tools. This bore (21) also makes it possible to introduce a handling spindle

for handling the punch.

  The lower adapter (4) has a heel (19) identical to the heel (6) of the upper adapter (1). Its lower part is adapted to allow the fixing on the table of a press brake of a determined type. The fact that the heels (6, 19) of the two adapters (1, 4) are identical allows mounting

  on each indifferently a punch or a matrix.

  The matrix (3) has a groove (20) identical to the groove (15) of the punch (2), and a bore (22) identical to that (21) of the punch (2). The bores (21, 22) are preferably centered on the thrust axis (7). Figure 2 shows an enlarged view of the heel of the adapter according to an alternative embodiment. The side wall (30) of the heel has a longitudinal (31) or circular window. This window communicates with a cylindrical bore (32) inside which is housed a cylindrical rod (35) having a flat (36). The rod cooperates with a stud (34) via an elastically compressible element (33), for example a spring. The nipple (34) is erect at rest and protrudes from the lateral face (30). When placing the punch or the die on the adapter, the stud (34) disappears, then comes out so that its end comes to lodge in the lateral rib of the groove. By turning the rod (35) a half-turn, it causes the locking of the stud in the erection position. Figure 3 shows a sectional view of a variant of multi-V matrix. The adapter cooperates with the matrix via a wedge (38) on either side depending on the slot (39 or 40) used. The invention is described in the foregoing

by way of nonlimiting example.

Claims (8)

  1 - Adapter for mounting tools on a press brake, consisting of a bar-shaped body having a first heel specific to a given type of press brake and capable of cooperating with the table or the upper deck of said press -bending machine, and a tool attachment means, characterized in that the tool attachment means is constituted   by a central heel (6) specific to the tool.   2 - Adapter according to claim 1, characterized in that the heel (6) specific to the tool is centered relative to a longitudinal plane   containing the axis (7) of the folding thrust.   3 - Adapter according to claim 1 or 2, characterized in that it has longitudinal bearing surfaces (8, 9) on either side of the heel (6) specific to tooling.   4 - Adapter according to any one of   previous claims, characterized in that the   heel (6) specific to the tool comprises at least one protruding element at rest, suitable for cooperating with a groove provided on the tool.   - Adapter according to any one of   Claims 1 to 4, characterized in that the heel   central (6) specific to the tool comprises a rotary longitudinal locking member between a disassembly position in which it disappears inside the heel, and a locking position in which it forms a projection suitable for cooperating with a throat provided on the tools.   6 - Adapter according to claim 5, characterized in that the locking member is constituted by a cylindrical rod having a flat (13) longitudinal. 7 - Punch and die to cooperate with an adapter conforming to any one of the   previous claims, characterized in that they   have at their connecting part a longitudinal groove whose section is complementary to the heel section of the adapter.   8 - Punch and die according to claim 7 characterized in that the longitudinal groove (15) has a rib (16) in the lateral recess to receive the projecting locking element of the adapter heel.   9 - Punch and die according to claim 7 or 8 characterized in that they have a lateral cavity (21, 22) for   the introduction of a handling spindle.   10 - Punch and die according to claim 7 or 8 characterized in that they have a longitudinal bore (21, 22) of polygonal section   for the connection of several juxtaposed tools.