FR2509208A1 - PROCESS FOR EXCHANGING PARTS IN VERY FAST MACHINING MACHINES WITH CHIP PRODUCTION AND TURN FOR IMPLEMENTING IT - Google Patents

Abstract

THE PRESENT INVENTION CONCERNS A PROCESS FOR EXCHANGING PARTS IN VERY FAST CHIP PRODUCTION MACHINES, AND MACHINES FOR ITS IMPLEMENTATION. THE MACHINE INCLUDES A COUNTER-DOLL HOLDER 3 MOUNTED IN A WAY TO BE ABLE TO MOVE AXIALLY IN THE COUNTER-DOLL 2 UNDER THE ACTION OF A CONTROL DEVICE IN CONTACT WITH IT IN THE AXIAL DIRECTION; THE HOLDER 3 HAS A COUNTER-DOLL TIP 5 EQUIPPED WITH A TORQUE CLAMP PER MOMENT OF ROTATION TO THE WORKPIECE 9, IT CAN BE DRIVEN BY A SECONDARY DRIVE MOTOR 6 ADJUSTABLE OR ORDERABLE IN NUMBERS OF TURNS OF THE VALUE ZERO HAS A VERY HIGH NUMBER OF TURNS. THE MAIN POINT 7 IS MOUNTED ROTATING IN THE MAIN SHAFT 1 AND IS AFRAID TO MOVE AXIALLY AGAINST THE FORCE OF A SPRING, SEPARATELY FROM A CLUT RIGIDLY CONNECTED TO THE MAIN SHAFT 1 AND INTENDED FOR THE COUPLING AT A TIME OF ROTATION OF THE WORKPIECE 9. APPLICATION TO ALL MACHINES, IN PARTICULAR CHIP FORMING, ROTATING AT VERY HIGH SPEED.

Description

The invention relates to a method for the exchange of workpieces with

  high speed chip producing machines, particularly high speed lathes in which the workpiece is under tension between the main point of a main motor driven shaft and the counterfoil head of A machining machine for carrying out this method is in particular a lathe in which the workpiece is mounted between points, and comprises a main shaft having a main point and which can be coupled to the spindle. workpiece according to the couple

  of rotation, and which can be controlled by a drive motor.

  adapted to the value of the chip production power, the lathe also having a

  tailstock sheath with a counterpoint

doll.

  To increase productivity, we have tried to

  to increase the power of chip production

  chip production machining machines, in particular

  linking towers An increase in production power

  It is possible, for example, to increase the machining speed, ie by increasing the number of chips.

  turns of the tree and increasing the power of com-

  while at the same time introducing tools for

  high value such as ceramic tools.

  If the number of revolutions of the shaft is increased substantially, for example at 10,000 rpm or even at 000 rpm, the chip production power of the machining machine is certainly improved, so

  substantial, but this improvement does not act in

  liteacar the ratio between the time of production of chips,

  that is active machining of parts and the time of pre-

  paration, that is the time required to tighten and

  loosening the workpiece deteriorates significantly.

  This deterioration is not only caused by the fact that the act of producing chips in itself goes faster but also because the increased control power

  now necessary for the main shaft requires the use of

  the use of a larger engine with rotating masses

  The braking and re-acceleration of this important control motor not only takes place with some inertia, but also requires power.

relative high.

  The problem underlying the invention is to create a process for the exchange of workpieces in high speed machining machines to produce chips as well as to produce a chip producing machine in such a way that that the relationship between the time of

  chip production and the preparation time should be

  in a decisive way and in addition to the wear of the

machining machine is decreased.

  To solve this problem, the method according to the present invention is characterized by the realization'of a flying exchange of workpieces while continuing the march of the main shaft, as it accelerates the workpiece.

  machining, uncoupled by torque from the main shaft

  cipal, through the tailstock sleeve coupled to the torque part, from a zero value of revolutions to a value coinciding at least

  approximately with the number of turns of the main tree

  the workpiece is then coupled by torque to the main shaft after reaching this

number of turns.

  To solve this problem also, the lathe is characterized in that the tailstock sleeve is mounted in the tailstock so as to be able to move axially under the action of a control device in contact with it in the direction axial, has a counterpick tip provided with a cleat-type device that can be rotatably coupled to the workpiece, and can be driven by a second adjustable or controllable control motor in number of revolutions from the zero value to a very high number of revolutions, and in that the main point is rotatably mounted in the main shaft and movable internally and axially against the force of a spring device separately from a connected cleat device rigidly to the main shaft for coupling by torque of the workpiece. Other advantageous embodiments and

  other features and advantages of this invention

  will become clearer in the description that will

  follow given as an example of embodiments.

  In the light of the partially schematic drawings

  in which: FIG. 1 is a side view of a high speed lathe according to the present invention; Figure 2 is an enlarged detail of this machine partially in sectional representation; and Figures 3 and 4 show a portion of Figure 2 at different moments of the exchange of the workpieces. The high power lathe shown in FIG. 1 consists essentially of a tool table 15, a main shaft 1, a tailstock sheath 3

  as well as chip production tools 12.

  The worktable 15 serves to mount a support

  main shaft port 16 and a tailstock 2 which can move axially relative thereto and which are at a distance from each other In the main shaft support 16 the shaft main 1 is on the one hand rotatably mounted and other partil is attached to a high power control motor 14 for

  control the main shaft and whose power

  command is the value of the power

required chip production.

  The tailstock sleeve 3 is rotatably mounted in the tailstock 2. In addition, a second drive motor 6 is still attached to the tailstock and has a low power compared to the first drive motor. command 14, and thanks to which the tailstock sheath 3 can be

  driven, as explained in more detail below.

  The workpiece 9 for producing chips is mounted in the tips, namely at one end on the main point 7 of the main shaft 1 and at the other end on the counterfoil tip 5 of the counter sleeve. doll 3 The assembly of the workpiece in spikes appears unusual at first because of these high numbers of turns However, it is a precise and very reliable assembly The use of clamping devices by

  chuck or similar elements is practically impossible.

  because of the centrifugal forces produced with the

  high tree revolutions sought.

  In the exemplary embodiment, two

  tool ports 12 movable horizontally and vertically

  as well as being able to turn around their longitudinal axis

  dinal horizontall cutting tools 17, for example

  Actually several coupey tools are set.

  To implement optimally the high-power tower performs each time a flying exchange of workpieces The main shaft 11 controlled by the motor 14 rotates during the exchange of the workpieces, that is to say say that during the introduction of the workpiece 9 into the machine and when the output of the machined part out of the machine it rotates with all its speed In this buton provides on the one hand the second control motor 6

  and, on the other hand, it is in conformity and

  on the one hand the main point 5 and the main tree

  pal 1 and, on the other hand, the tailstock tip 5 and the

tailstock sheath 3.

  Figure 2 shows details of the

  the main shaft and the tailstock sleeve.

  The tailstock sleeve 3 is rotatably mounted in the tailstock 2 and can also be moved axially in the tailstock 2 or in a carriage under the influence of a control device 4 in the form of hydraulic cylinder engine that is

  in contact with it in the axial direction.

  doll 5 of the tailstock sheath 3 is provided with a

  positive cleat through which the tailstock tip or the tailstock sheath 3 can be coupled in torque with the workpiece 9. This cleat device can be shaped in the manner of a clutch clutch or the like, wherein notches, grooves or the like are at the front of the workpiece

  to machine 9 and extending at least approximately radial-

  undertake corresponding salient parts

  lying on the front side of the tailstock sheath.

  On the contrary of the tailstock sleeve 3, a main point 7 and a cleat 8 on the side of the main shaft 1 are completely separated from each other while the cleat device 8 can be shaped the same way or roughly as the

  corresponding cleat device of the counter sleeve

  doll 3, and rigidly connected to the main shaft 1, the main point 7 is mounted independently of this _

  so as to freely rotate in the main shaft 1.

  It can be introduced somewhat axially into the

  1 against the force of a spring device 13 The exchange of workpieces takes place as follows:

  We start from the fact that the main shaft 1 is com-

  The workpiece is then placed in such a position between the main point 7 and the counterpoise point, by means of a transport device 10, for example a lifting beam device which passes through the machine in the area between the two points 1 and 5 in a horizontal plane lying below these points and transverse by

  relative to the longitudinal axis of the points, that the longitudinal axis

  tudinal of the workpiece 9 is aligned with the axes

  of the main shaft 1 and the tailstock sleeve 3.

  This position is shown in Figure 3 The workpiece 9 first is not in contact with the main tip 7 rotating because of friction with the main shaft 1, or with the counterpoise tip 5

  when it is stationary When activating the

  4, the non-rotating tailstock sleeve 3 comes out axially, so that firstly the tailstock tip 5 enters a centering bore of the workpiece 9 on the opposite side. before and at the same time a torque coupling is established between the workpiece 9 on the one hand and on the other hand the deviceapparatus 18 of the tailstock tip During a subsequent axial movement of the sleeve of 3 against the doll, the workpiece is threaded by its other front side on the main point 7 which therefore remains fixed in case it should rotate as a result of

  friction with the main shaft 1 The counter sleeve

  doll 3 is then moved axially to a point such that

  the workpiece 9 is certainly pushed on the main tip

  7 of the main shaft, but that the

  positive cleat 8 of the main shaft rotating at full speed has not yet managed to engage the piece

  This position is shown in Figure 4.

  After reaching this position the tailstock sleeve 3 is accelerated by the second control motor 6 adjustable or controllable in number of revolutions without interruption, a value of zero to a number of revolutions corresponding at least approximately to that of

  the main shaft 1, the tools 17 then obviously being

  out of contact during this period.

  As soon as the number of turns of the workpiece 9 corresponds at least approximately to the number of revolutions of the main shaft 1 driven to the speed of the control motor 14, which is detected by known devices for measuring and comparing the numbers

  of turns, the tailstock sleeve 3 is pushed axially-

  further in the main shaft 1 by means of the

  4 until the cleat device 8 is coupled to the workpiece 9 in force or torque, so that the actual exchange of the workpieces is completed and the machining of the workpiece is complete. production

  chips on the piece can begin.

  The second control motor 6 which only has for example 2 to 5% of the power of the main control machine 14 could in principle continue to rotate during the machining process or also rotate freely in idle It is however more it is advantageous to separate from the workpiece 9 the second control motor 6 from the point of view of the rotational torque, just as the workpiece has been coupled in torque with the main shaft 1. For this purpose, a free rotation device 11 is inserted between the tailstock sleeve and the second control motor 6. The second control motor 6 is simply turned on, as already indicated above, at a number of turns which slightly below the number of revolutions of the rotating main shaft 1 This difference in numbers

  turns produces a separation between

  doll and second control motor 6, when the rotational torque connection between the main shaft 1 and the workpiece 9 and thus also between the control shaft 1 and the tailstock sleeve 3 is established The second control motor 6 can then be put back to

shutdown.

  At the end of the chip production machining on the workpiece 9, the next coin exchange takes place -The finished workpiece is removed and a new workpiece is inserted When the workpiece is removed finely machined, the process steps described above take place essentially from

  inverted way After returning the cutting tools of produc-

  17, the tailstock sleeve 3 is withdrawn by the control device 4 again far enough (to

  the right, figure 2), so that the workpiece moved axially-

  in the same direction under the influence of the spring device 13 is separated in torque from the clutch device 8 of the main shaft 1 Ensuitela workpiece 9 is braked by reducing the number of revolutions of the second control motor 6 Finally , the tailstock sleeve 3 is further extended and the finished part is rejected on the transport device 10. In the case where the second control motor 6 is connected to the tailstock sleeve 3 via a device 11, it shall be equipped with a switchable free-walking

  allow braking of the tailstock sleeve.

  The present invention not only allows the use of

  optimal use of a machining machine at very high speed by the exchange of workpieces which must be carried out very rapidly, but also the significant reduction in wear of the main control having relatively large rotational masses and that in them conventional machining machines must be braked constantly and to

accelerated again.

Claims (9)

  1 Process for exchanging workpieces in high speed chip machining machines, particularly high speed lathes, in which the workpiece is tensioned between the main point of a main shaft motor controlled   and the counter-doll tip of a counter sheath   doll, characterized by performing a workpiece-exchanging exchange while the main shaft (1) continues to rotate, since the workpiece (9), uncoupled in rotational torque from the main shaft ( 1) is accelerated by the tailstock sleeve (3), coupled to this piece by rotation torque, from a zero value to a number of revolutions corresponding at least approximately   to that of the main tree, and is coupled to the main tree   (1) after obtaining by torque of this name many rounds.   Method according to claim 1, characterized in that a second control motor (6) is separated in rotational torque from the workpiece (9) and the workpiece (9) is coupled in pairs of rotation to the main shaft (1).   The process according to claim 1 or 2, wherein   in that the exchange of the workpieces takes place automatically.   due to the fact that the workpiece (9) is aligned with a transport device (10), passing through the machine   machining in an axially parallel position with respect to   port to the axis of the main shaft and counter sheath   doll, is under tension between the main point (1) and the tailstock tip (5) and is coupled by   rotation torque with the tailstock sleeve (3).   4 machining machine producing chips, in particular a lathe for carrying out the method according to   one of claims 1 to 3, where the workpiece is   mounted between points, and comprises a main shaft having a main point and being coupled to the workpiece by torque, the main shaft   which can be controlled by a corresponding control motor.   power to the value of the chip production power, as well as a tailstock sleeve having a counterpoise tip, characterized in that the tailstock sleeve (3) is mounted in the tailstock (2) so as to be able to move axially under the action of a control device (4) which contacts it   in the axial direction, presents a counterpoint   doll (5) provided with a latching device which can be coupled by rotation torque to the workpiece (9), and can   controlled by a second control motor (6)   or controllable in revolutions from zero to the highest number of revolutions, and in that the main spike (7) is rotatably mounted in   the main shaft (1) and to be able to move inside-   axially against the force of a centrifugal device   (13), separately from a device (8) connected rigidly   to the main shaft (1) and intended for coupling   by rotation torque of the workpiece (9).   5 Machining machine producing chips   according to claim (4), characterized in that the power   of the second control motor (6) is not planned   at least substantially larger than it is necessary   to continuously accelerate from zero to the value of the number of revolutions of the main shaft (1) the workpiece (9) not in contact with chip production and to brake it to a value zero when removed from the number of laps of the main shaft (1).   6 chip production machining machine according to claim 4 or 5, characterized in that the   second control motor (6) can be separated from the   counterweight (3) after torque coupling of the workpiece (9) with the main shaft (1).   7 chip production machining machine according to claim 6, characterized in that a free-walking device (11) is inserted between the sheath of   tailstock (3) and the second drive motor (6).   8 Chip production machining machine   according to claim 7, characterized in that the provision   walking device (11) is equipped with a   switchable free-motion lock.   9 Chip production machining machine   according to one of claims 4 to 8, characterized in that   it comprises a transport device (10) passing through the machine, in the area between the two points (1, 5), in a horizontal plane below the tips transversely to the longitudinal axis of the tips ( 1, 5), this transport device allowing   to automatically put the workpiece (9), possibly   by interposing a lifting device in an axial position with respect to the main points and tailstock (7, 5).