DE2931227A1 - Rotatable work-table for machine tool - has electric drive and locking device actuated by electromagnets - Google Patents

Abstract

The worktable of a machine tool has an integral shaft which runs in a bearing in a boss in the support casting. The worktable can be rotated by an electric motor which drives a spur pinion through bevel gears. The spur pinion meshes with an internally toothed ring fixed to the underside of the table. The table is locked in its required position by two swinging arms with teeth cut in their edges which can engage the teeth of the ring. These arms are actuated by electo-magnets and thus eliminate the need for hydraulic or pneumatic devices which are usually employed for this purpose.

Description

L Rotary indexing tables in the design and equipment of internal gear rims on the turntable and with radially movable toothing elements in the lower part of the indexing table for locking and locking a turntable in the selected working position its function, control and operations preferably with electric, magnet. pressure and tension elements takes place, and under certain operating conditions, these elements also optionally as hydraulic pressure medium or pneumatic design. applicable are, or among others. for additional devices, which are made possible by a mini-hydraulic device is actuated in the housing.

In. the Iraxis and through the Publications are rotary indexing tables become known in which the arresting of the turntable is consistently suitable Locking organs and elements with the lower part of the housing of the rotary switch unit are rigid connected is. For example, these are latching pawls or latching bolts vertically or radially arranged. furthermore also fan toothing rings above in the latter Ealle the turntable with the Elanzahnring for the dividing step around the. Serration height are raised and at the work position point again with tensile forces n the siersahnung must be drawn in. . This is done consistently with hydraul. Pressure means or also with pneumatic controls and actuators and cylinders @len. and @@@@@@@@ similar elements, for automatic processes of the required functions, of the turntable Additional external hydraulic units ae.t drive motors are used for this S pumps, oil tanks and control plates with electromagn. Actuation etc. necessary, that, if it is an electrically operated machine, that of the turntable to be equipped should require an en @ rmen @ostenkosten, a cost this also takes place if the machine is already equipped with a hydraulic unit is operated, it must also be equipped with the necessary control slides and others

elements for the turntable are toasted.

- in addition there are the costs for pipelines or hose lines, This is after all 3 pressure medium supply lines and 3 pressure medium return lines for the turntable and additional. one pipeline each for the one busy on the turntable ####### workpiece clamping device with automat. operated hydraul. or pneumat. Clamping elements In total, there are 8. Rchr or optionally hose lines additionally to be arranged and assembled.

adorn such a turntable on a machine tool Carriage arranged for a more or less long fffbeits or transpot path is, must for the hoses (8 .tck) a so-called trailing cable or. Hose inspection arranged next to the machine, which is very expensive and cumbersome is for operator access to the machine.

@@ seen of course, the expense of individual components is also not an issue hydraul. operated indexing tables relatively high and the, manufacturing-east as well the selling price is correspondingly high.

In many cases, the automat, the turntable for the lifting Lifting out of the locking toothing p ## table often not worthwhile or for the intended workflow.

In contrast to the disadvantages mentioned above, disadvantages of those that have become known Rotary indexing table constructions and types, these are when they are executed r @ patent registration does not exist and also have essential technical and operational Advantages compared to these with advanced features among other things All function and control processes are carried out without hydraulic or pneumatic Pressure medium and their associated control and actuation elements, including of the external hydraulic units, Pohr and Dschlauch line fittings, etc., it high financial outlay, as briefly outlined above.

, it takes place exclusively through the subject of the registration, so to speak el @ ectrische tax -u. Actuating elements, such as electr. Drive motor for the switching rotation, the customer table scwie through El. Pressure and train @ agnete, etc., the ### optionally with normal electrical co-electronic switchgear whose function sequence initiates resp. controls.

Accordingly, only a multicore fable with a small diameter is dated Control cabinet required for rotary indexing table, which is also used for rotary tables on Erkz. Machine slide has a longer travel to work cycle by cycle, without additional Effort and disability can be arranged to operate.

Another advantage is that it is operationally but also more technical Kind, given that for the table switching process after each workflow, the The turntable with its circular toothed ring smells more from the toothing up and down has to be raised and lowered, so great weight loads on the breeding table Clamping devices and heavy workpieces are not possible.

The fully electric control and operation - the function and work flow this rotary indexing table also significantly affects the design and construction in relation to the number of tertiary parts and through the use of standard u.

commercial electr. Operating elements The susceptibility to failure and wearing parts are reduced and manufacturing costs are significantly reduced.

It is also often an essential moment for using the turntable the lower overall height compared to known brands.

In the case of multi-station ring table transfer machines and, above all, also Multi-station row transfer machines are used to equip the movable workpiece tables with g fully electrically controlled and operated rotary indexing tables without special effort or difficulties feasible, even interchangeable if necessary the diversity of the workpiece to be machined requires it (conversion ). In the event, the el.

Power transmission through movable. Cable arrangement or at each station by contactor elements.

The equipment of such Mehstat. Atomatics with yhdraul. or pneumatic Pressure means is practically only associated with enormous effort and costs, soP it is of no interest in practice, even if it would offer greater advantages.

In the drawing, the subject of the invention is in one embodiment shown. It shows in Fig. I a section A-E in the II a section BB of the Rotary indexing tables and in Fig III a section for an alternative design it @ equipping an ilan gearing.

ig. I. the turntable (1) with the lower surface and the surface of the internal ring gear (4) on the surfaces of the indexing table lower part housing (8) as an axial bearing flat on 9 bearing neck (2) of the turntable is in a centrally arranged, Bearing hub mounted (9) which absorbs the radial forces from the machining process record, on the other hand, the exact centering of the turntable is guaranteed.

a threaded ring (3) is screwed on the free de of the bearing neck, aer play-free the dretic in the direction upwards and against forces in this direction secures.

The internal gear rim @it normal or corrected face gearing (4) is rigidly connected to the turntable (1) by screws and cylindrical pins.

In the lower part of the rotary table (@) Fig, I and II in cast-on hubs opposite one another a bearing pin (7) is used in each case. On that free end is a bearing hub of the 3-face toothing segment (5 and 6) mounted with a tight fit. these two serrated segments are radially pivotable through the free other land, and can functionally in the toothing of the internal gear rim (> 4) on the turntable (1) can be swiveled in to lock the turntable in position on the one hand and to the solution on the other for the following partial switching path.

A locking lever (21) (; t'ig II is on the one hand on a pin (22) - the pendulum arranged in the lower part of the housing (8) - ####### = a so-called. Locking lever stored. The free end of the same lies on an inclined face against a corresponding face of the free end of the toothed segment (5), when this is swiveled into the toothing of the inner ring gear (4) as shown is, after this functional process of pivoting into the toothing, a electr.

Hub resp. Tightening niagnet (20) in the lower part housing (8) arranged is autom. energized. This makes it close to the distance of 1% 3 mm located side surface of the locking lever (21) from this magnetic field 20 tightened The position of the toothed segment (6) shows it in the outward direction Pulled position - turntable locking free for the next switching step after automatically after automatically the hub resp. Anzag- magnet (<? O) de-energized and the locking lever (21 ) has been pushed back to its original position. Purely the respective radial retraction the toothed segments (5 and 6) into the toothing of the inner ring (4) for locking of the turntable (1) and, conversely, the lifting of the tooth segment after the work cycle for the solution of the locking, are radially around the lower part for each sewing segment a train respectively Pressure lifting magnet (18) used in a fixed manner, the plunger of which is at the free The end of the two ahnsegmente (5 and 6) are in contact, respectively, depending on the size. diameter of the rotary indexing table and their built-in internal tooth rings (4) are useful Use more than 2 tooth segments for locking the turntable, once around the correspondingly higher circumferential forces arising from the machining - But then also to absorb processes in order to achieve the highest possible rigidity of the table to reach.

The drive @@@ the respective partial rotation of the table (1) in the The next working position takes place, for example, as shown in Fig. I and Fig. II by an El. Small motor (16) on a radially arranged hub of the lower part (83 is flanged. Its output shaft (17) is either direct with the axially to her lying respectively.

Bearing bevel pinion shaft (12 # as usual with keyway and key or Eupplungs sleeve connected to a low speed of the spur gear BEZW. Pinion (10) ind to obtain a high drive torque for the table drive as well Provide the pinion shaft (10) with a largely large bevel gear (11) at the lower end in which the Ketel pinion (12) engages.

The respective Fositionsstellung of the turntable (1) can be known in by electr. sucked Limit switches and actuating cams are made, for example also by electron.

Positioning elements with programmable switching steps Rotary indexing tables, especially in automatic; 'ierkzeugmaschinen bezw. with automatic Work-uO functional processes are in most cases beewo consistently, these with hydraul. Workpiece clamping devices equipped with pressure means and clamping elements Mistake. These require their own external hydraulic unit to the extent that as listed and explained in more detail on page 1, at this high cost Around this relatively high production u. Costs n, which is about 50 @ .80% of the costs of a medium to smaller round table is described below Establishment of a 1? I.ni hydraulic system in the Qundtisch lower part with very little creation and costs arranged and not only for the above-mentioned actuation of hydraul. Jig elements.

It can alternatively be used for other functional elements on rotary indexing tables lt, which are listed and explained below.

As shown in Fig. I and II, the pinion shaft (12) is not direct respectively driven by direct coupling with the motor output shaft (17), but Via a specially designed clutch element with overrunning clutch (13 and 14) this @upllungselement sits on the one hand on the output shaft (17) with groove and notor's wedge (16) on the other hand with a neck in the radial hub of the Housing (8 A mounted, axially to the pinion shaft (12) over the front part of this coupling has an eccentric disc and in the sleeve next to the freewheel clutch (14- ) a bearing bushing or bearing on the pinion shaft 12.

ie shown in Fig. II is radial to the clutch eccentric disc (13 ) arranged a hydraulic pump piston (23) with Spiralfecer (24), wherein this compression spring pushes the piston against the peripheral surface of the Erzenterscneibe (13) arlegs resp.

press lightly 0 ble holes for this are in a corresponding @ ehäuseausbldung on the lower part (8) introduced its ufflsung outside with a sucked, pipe screw connection with channel bore respectively. Hole (25) for the pipe connection is provided.

'r'as hydraulic pressure medium is with the rotating eccentric disc 13) alternately sucked and conveyed through the connecting pipe to the working elements with the usual use of check valves for the suction line of pressure medium -Chamber in and the separate pressure line. Housing lower part (8) The pressure line Expediently leads to a small softer divided by this to the consumable elements like jigs u similar respectively. other. The pressureless pressure medium is in headed the aforementioned pantry.

With special consideration that with small meilschaltwesen of the table only a small revolution or number of revolutions of the pinion ( 1G) is required, the amount of funding would be of the relatively very small dimensions the The delivery rate of the relatively very small sump dimensions is not sufficient provided hydraul. Set actuators to feed sufficiently> even if the The speed of the coupling eccentric is higher due to the reduction of the gear unit.

This -reils required pressure medium- amount is determined by the following Functional sequence achieved within one work cycle.

After switching on the El. Drive motor, for example, in the direction of rotation (clockwise) to the right, the dretic is also to the right up to the preset Position point rotated and the drive motor stopped, at the same time the locking functions the same carried out respectively. initiated. Immediately with about 0.2 seconds after the stop? we switched on the electric motor with a reverse, i.e. left-hand rotation, namely with a 2nd increased speed per unit of time, which meets the requirements of Ball can be adjusted on a case-by-case basis.

The pump conveys the pressure medium into the memory and into the working elements as long as these two are filled to an adjustable maximum pressure and are saved, namely saved for the next machining cycle and functional sequence must be available at the beginning, if the period is due to Short-term work cycles, or higher volume requirements for larger units As already described at the beginning, you are able to do this by increasing the piston stroke and the piston diameter to increase the delivery rate. In alternative cases the Rotary table type with increased pressure medium requirement, a second delivery piston can be used compared to the Sumpenkolbenv device shown in the drawing. Time relay is resp.

can the drive motor (16) when the required volume is reached The additional hydraulic equipment mentioned above can be switched off also in the same design for different or alternative designs, for example used by rotary indexing tables respectively. such as those below described.

With larger rotary indexing tables, in principle the same or similar Design can for the radially arranged hub u. Zugmggnete (16) because of larger required forces associated with larger dimensions of the same, hydraulically operated pressure cylinder or so-called. respectively Screw-in cylinder like her are commercially available on the market and are often used for clamping elements, among other things. on workpiece Jigs are used be arranged for dig function the radial engagement of the toothing -.- elements for locking the indexing table (1) and and to disengage them for the solution of the locking for the next Switching step and so on. A required Klei hydraul. Small control valve for the pressure medium supply and return can be carried out within the rotary table lower part ( 8) for the larger and large X indexing tables with the pipelines approx. 6 m m 1. Expansions can be easily accommodated, with little cost for the necessary commercial parts.

The r-principle of the subject matter of the invention that no costly external hydraulic units and no external pipe or hose lines required , but only a multi-core elktr. Cable with a small diameter remains in place, and thus its progressive moments and advantages.

For example, in special cases the equipment of a rotary indexing table with face gear rings for locking the indexing table instead of the spur gear Toothings in the execution as described above take place.

In Fig. III as a partial section, such an embodiment is shown .se..1. The axial lifting of the two helical teeth - rings (26 and 28) is in this In the case of the centrally arranged ring pressure chamber 6 30) in the table (1) , which is formed by the two ring hubs (29) and the central one arranged therein Ring (31) in the lower part of the rotary table, the latter has a channel respectively

a bore (31) for the pressure medium supply and discharge, also with this construction version remains the principle with the advantages mentioned of the subject matter of the invention, albeit with a modification.

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Claims (1)

P a t e n t a n s p r ü c h e Rotary indexing tables in design and equipment with internal toothed cranks on the turntable and movable toothed elements in the bold area Lower part anchored to lock the turntable in several working positions , its controls and actuations preferably with, for example, electrical Elements such as push and pull magnets. It is also equipped with a hydraulic pump device in the housing of the lower part to allow hydraul. To promote pressure medium for additional devices such as on the Rotary table arranged w4verkstück clamping devices with hydraul. actuated clamping elements, among other things also for hydraul. Pressure u. Tension elements optionally instead of the above listed electrical close-uO pressure magnets under certain operating conditions can be used. characterized in that (1.) for locking the indexing table (1) in the required rigid working position, in the sun with the static fixed lower part of the housing (8) the arrangement of an internal gear rim (4) in a fixed connection with the table (1) and also 2 or more radially pivotable Toothed segments (5 and 6) are provided, which are mounted on the one hand in a pin (7) are and at the radially movable free end after pivoting into the internal toothing (4), the locking lever (219 pivoted on the carriage against the free End of the tooth segment (5 and () is firmly attached. d a d u r c h e k e n n n z e i c h n e t that 2.) for the functional Actuation of the toothed segments (5 and 6) as well as the locking lever (21) in the table Lower part (8) electromagnetic pressure and tension elements (18) and (20) fixed are arranged in a corresponding position. characterized in that the drive motor (16) for driving the rotary movement of the indexing table (1), for example via a pinion shaft (12 of a reduction gear, by means of a specially designed coupling element (13) which has an eccentric disc at the drive end and a sleeve at the other end, the outside diameter of which is mounted in the lower part (8) 8 carries a free-running clutch (14) and a bearing bush or roller bearing 15 in the inside diameter, which sit on the pinion shaft (12). 14) the pinion shaft (12) rotates in a non-positive manner and via a bevel gear, the shaft with the spur pinion (10) via the internal gear rim (4) rotates the indexing table (1) into the lost position, and when the direction of rotation is then changed, the pinion shaft 4 12) is free from the drive , 4.) characterized in that the hub arranged radially on the lower part body (8) for the drive mechanism of the Turntable (1) has a hydraulic pump piston (23) in a corresponding bore, the end face of which rests firmly against the circumferential surface of the eccentric disk (13) ####### of the clutch element and at the other end against a compression spring (24), which in turn rests at the bore outlet against the surface of a pipe connection screw, which the latter conducts the Xnsallg -u.- discharge delivery of the pressure medium into and out of a pipeline from the pumping chamber. which is effected alternately by the rotation of the eccentric disc (13), 5.) characterized in that the hydraulic. Piston pump (23) conveyed pressure medium for additional devices on the turntable (1) for example workpiece clamping devices with hydraul. operated clamping elements feeds, alternatively or alternatively, the pressure medium for actuating hydraul. Pressure and tension elements which from case to case instead of the electr. Lifting magnets (18) or (20) of the rotary indexing table shown can be arranged, or for rotary indexing tables with face toothing elements for the table locking as in Fig. III. shown,