FR2588787A1 - TOOL MACHINE WITH NON-UNIFORMLY ENTAILED TOOLS, ESPECIALLY A MACHINE FOR THE PRODUCTION OF WORKPIECES MADE OF A WIRED OR BAND MATERIAL - Google Patents

Abstract

THE INVENTION RELATES TO A MACHINE TOOL WITH NON-UNIFORMLY DRIVEN TOOLS. TOOL CARRIAGES 12 CAN BE DRIVEN SEPARATELY IN PREDETERMINABLE MUTUAL RELATIONSHIP AND WITH A COMMAND PER PROGRAM. THE DRIVING OF ELEMENTARY11 CAMS OF MUTUALLY IDENTICAL CONFORMATIONS AND, PREFERREDLY, WITH AN EXTERNAL CONTOUR CORRESPONDING TO AN ARCHIMEDE SPIRAL, IS CARRIED OUT INTERMITTENTLY, POSSIBLY WITH A DIRECTION OF ROTATION THAT ALTERNATELY, BY A ROTARY OR ROTORABLE MOTOR. APPLICATIONS ESPECIALLY TO THE PRODUCTION OF PARTS SHAPED FROM A MATERIAL IN THE FORM OF THREAD OR TAPE.

Description

Machine tool with non-uniformly driven tools, in particular machine

  production of shaped parts from a material

in the form of wire or tape.

  The present invention relates to a machine-

  non-uniformly driven tool tool, in particular to production machines for shaped parts constituted by a material in the form of a wire or a strip, comprising at least one

  minus a tool carriage placed so as to be able to

  smooth in a support and driven elementary cams,

  controlling the movement of the tool carriage through the

mediator of sensory elements.

  In the case of machine tools with non-uniform tools

  such as production machinery,

  parts made from wire or web material, it must be ensured that tools or tool carriers do not collide during the movements they perform to work a workpiece. , for example to produce a shaped part

  from a material in the form of wire or tape.

  In the case of a machine for producing shaped pieces of material in the form of a wire or a strip, known from DE-A-26 18 846, the control of the tool-carrying carriages is carried out by means of feeler rollers and control cams cooperating with them of each rotatable body rotatable in the supports. Each rotating body is connected via a shaft and a bevel gear placed at one end to a central control gear. As soon as the central control gear rotates, the tool carriage moves according to the predetermined displacement law by the control cams. To be able to predetermine different motion sequences for tool carriers

  according to the tasks prescribed for each tool for the proces-

  When machining or bending or forming, the rotating body is removably connected to the shaft so that rotating bodies can be used.

  with control cams of different conformations.

  In order to produce a new or modified workpiece, therefore, a new control cam is generally required for each tool carriage. The production of a new cam takes not only time, but is also very expensive, and it takes a lot of preparation time to change the cam or replace a control cam with a new control cam. Finally, we

  can not obtain an adaptation of the movement of the carriage

  tool after tool wear and tool sharpening

  possibly necessary with a lot of complications.

  The subject of the invention is a machine tool comprising

  non-uniformly driven tools, in particular a machine for producing workpieces made from wire-like or web-shaped material, which has much more universal usage possibilities and allows much more flexible manufacturing with

  reduced preparation and adjustment time.

  To achieve this objective, according to the invention, the elementary cams are attached to each movable tool carriage in a mutual relation freely

  predeterminable and they can be inde-

  with each other by being controlled by

  gram. With the means according to the invention, we obtain

  a programmable cam control allowing, by programming,

  Simple setting of the individual parameters for the predetermined distance-time function of the tool carriers, quick adjustment and preparation for the movement of the tool carriers in the case of a new workpiece. It is even possible, in this case,

  to manually enter the corresponding parameters.

  to the movement of the tool carriage directly on

  the piece shaped on the tool, and memorize immediately

  the simulated distance-time function. A programmable cam-control of this type enables exact undistorted force transmission in each position of the tool carriage and thus avoids control circuits.

  and complicated tuning in a hydraulic system.

  According to an appropriate embodiment of the invention,

  elementary cams can be trained to

  intermittently, possibly in a direction of rotational

  alternate. This implies that the elementary cams can perform not only oscillatory movements, but also, for example, movements with no basking, so that the tool carriage can be moved with or

  without momentary interruption (instant stop).

  In this case, it is advantageous that the cams

  the same conformation, preferably with a peripheral contour corresponding to an Archimedean spiral. This makes it possible not only to obtain, with a very short cycle of movement, the desired distance-time functions of the tool carriage, but it suffices for each tool carriage of a basic cam which, according to the corresponding programming, allows drive movements of the tool carts desired in

  each case. In this case, the program can already be

  for the new workpiece, while the old program is still in progress, so that, for the newly produced workpiece, all that remains is to replace the tools with new ones in the tool carts. Thus, a manufacture is obtained

  extremely flexible and extremely economical in time.

  The elementary cams may each be driven by a rotor motor or a hydro-electric rotary motor, the elementary cams being movably mounted in an engine block of the rotor motor and being shaped so as to cooperate with wheels also mounted movable in the carriages. , freely rotating, constituting the

feeler elements.

  A preferred embodiment of the invention will now be described in detail, shown in the appended drawing of which: FIG. 1 is a schematic representation of the control of a tool carriage;

  FIG. 2 shows a trolley unit carrying

  tool having an elemental cam, in side view; Figure 3 is the corresponding side view in partial longitudinal section; Fig. 4 is a top view of the tool carriage unit, an elementary cam having been removed; FIG. 5 is a timing diagram for

a movable tool carriage.

  In the schematic representation of FIG.

  1 denotes a numerical control by calculation

  The latter is connected to a spindle tilting system 3 not shown in detail, comprising a servovalve 4. This servovalve 4 is connected on the one hand by a pipe pressure 5 and, on the other hand, by a supply line 8, to a machine tool 7 driven by a prime mover

  7. The servo-valve 4 drives a rotor motor 9. The servocontrol

  is internally between the rotor motor 9 and the system

spindle tilting 3.

  The motor 9 drives each elementary cam 11

  of a tool carriage 12 according to the predetermined program

  mine. In the case of a machine for producing workpieces made from wire or web-shaped material, a plurality of such drive mechanisms are attached to a tool carriage 12. These tool carriers may be the inside of the machine in parallel, diagonally, transversely or

  in another way. It depends on the piece shaped to

reduce.

  Only a tool carriage of this type 12 in FIGS. 2, 3 and 4 is shown by way of example. It is possible to fix a tool that is not shown to each carriage.

  tool holder 12 by means of bores 13. The carriage

  tool 12 is, in each case, movable axially in a

  support 14 under the counteracting action of a communication spring

  pressure 15. At its end opposite the tool, the tool carriage 12 comprises a support shaft 16 for receiving a roller 17 acting as a feeler element. The roller 17 cooperates with the elementary cam 18 which is driven in a manner not represented by the motor 9. The motor 9 is fixed to a base 21 of the machine by a screw 19, as well as the

support 14.

  As shown in FIG. 2, the elementary cam 18 has an outer contour 22 corresponding to an Archimedean spiral, through which the elementary cam 18 cooperates with

the roller 17.

  As shown in FIG. 4, the tool carriage is not placed directly in the support 14, but in

  correspondingly adjustable guide bars 23.

  We have omitted to represent the elementary cam 11 on the

  Figure 4, for reasons of clarity.

  The machine tool operates as follows: The desired movements of the various tool carriers 12 are introduced according to the shaped part to be produced in the CNC control 1 and stored therein. This makes it possible to drive the elementary cam 11 intermittently

  by means of the rotor motor 9 controlled, for example, hydrau-

  liquement. The training movement can, according to the program introduced, be intermittent, oscillating or no pilgrim. It depends in each case on the shaped part to be produced. This makes it possible to make a tool carriage 12 carry out training movements, for example of the type reproduced on the distance-time diagram of FIG. 5. Two stopping points 24, 25 during the unfolding

  movement are represented. It goes without saying that the movement

  can also take place without stopping periods, so without

instant stops.

  The program can be used to prepare or adjust the necessary tools. It is not necessary, in this case, to replace the elementary cams, but we can always operate with the same

basic cam.

  It goes without saying that the invention is not limited to

  bending machine with tool carriers individually movable

  but it can also be applied when

  tools with non-uniform drive on machines-

tools.

Claims (5)

  1. Machine tool with non-uniformly driven tools, in particular a machine for producing workpieces made from wire-like or web-shaped material, comprising at least one tool carriage movably positioned   in a support and elementary cams trained to   the movement of the tool carts by the interme-   characterized in that the elementary cams (11) are attached to each movable tool carriage (12) in mutual relation freely   predetermined and can be trained in a mutual   independently by being commissioned by program.   Machine tool according to claim 1, characterized   in that the elementary cams (11) can be   born intermittently, possibly with a sense alternating rotation.   Machine tool according to any one of the claims   1 and 2, characterized in that the elementary cams (11) have mutually identical conformations, preferably with a peripheral contour corresponding to an Archimedean spiral.   Machine tool according to one of the claims   1 to 3, characterized in that the elementary cams (11)   are each driven by a hydro-electric rotor motor that (9) respective.   Machine tool according to any one of the claims   1 to 4, characterized in that the elementary cams (11)   are each placed so as to be movable in a block   motor of the rotor motor (9) or corresponding rotary motor, and are shaped so as to cooperate with rollers (17) also mounted so as to be movable in the freely rotatable tool-carrying carriages (12) constituting the feeler elements.