DD287672A5

DD287672A5 - EQUIPMENT FOR COOLING FOR MULTI-SPINDLE TURNING MACHINES

Info

Publication number: DD287672A5
Application number: DD33246789A
Authority: DD
Inventors: Winfried Mueller
Original assignee: Veb Drehmaschinenwerk Leipzig,De
Priority date: 1989-09-08
Filing date: 1989-09-08
Publication date: 1991-03-07

Abstract

Die Erfindung betrifft eine Einrichtung zum Kuehlen der Spindeltrommel von Mehrspindeldrehautomaten. Die Bohrungen im Spindelkasten, die zur Aufnahme der Tragscheiben der Spindeltrommel dienen, weisen in ihrem oberen Bereich eine Ringnut von beispielsweise 300 auf. Der Zuflusz fuer das Kuehlmittel in die Ringnuten erfolgt ueber Leitungen. Das erwaermte Kuehlmittel wird gesammelt und ueber eine Leitung dem Kuehler zugefuehrt. UEber eine Pumpe gelangt es zu den Proportionalventilen, die mit den Leitungen zu den Ringnuten verbunden sind. An den Auflagestellen der Spindeltrommel sind Meszstellen fuer Temperaturen angeordnet, die mit einem Regler und einer Leistungsstufe verbunden sind, durch die die Proportionalventile angesteuert werden.{Mehrspindeldrehautomat; Spindeltrommel; Kuehleinrichtung; Lagerstelle; regelbar}The invention relates to a device for cooling the spindle drum of multi-spindle automatic lathes. The bores in the headstock, which serve to receive the support disks of the spindle drum, have an annular groove of, for example, 300 in their upper region. The Zuflusz for the coolant in the grooves takes place via lines. The heated coolant is collected and fed via a pipe to the radiator. Via a pump, it reaches the proportional valves, which are connected to the lines to the annular grooves. At the bearing points of the spindle drum, measuring points are arranged for temperatures, which are connected to a regulator and a power stage, by means of which the proportional valves are controlled. {Multi-spindle automatic lathe; Spindle drum; cooling device; Bearing; adjustable}

Description

entsprechende Proportionalventil die maximale Kühlmittelmenge zur Kühlung an die wärmere Lagerstelle und an die kältere Lagerstelle eine temperaturabhängig reduzierte Kühlmittelmenge gibt, bis wieder gleiche Temperaturen hergestellt sind.corresponding proportional valve, the maximum amount of coolant for cooling to the warmer bearing point and the colder bearing a temperature-dependent reduced amount of coolant are until again the same temperatures are produced.

embodiment The invention will be explained below with reference to an exemplary embodiment. It shows

Fig. 1: Funktionsschema Fig. 2: Ansicht A gemäß Fig. 1 Fig.3: Ansicht B gemäß Fig.2.1: Functional diagram FIG. 2: View A according to FIG. 1 FIG. 3: View B according to FIG.

In dem Spindelkasten 1 eines Mehrspindeldrehautomaten herkömmlicher Bauart mit waagerechter Maschinenhauptachse ist die Spindeltrommel 2 gelagert. Sie besteht aus einer vorderen Tragscheibe 3 und einer hinteren Tragscheibe 4, die durch nicht näher dargestellte Stege miteinander verbunden sind und zwischen denen der ebenfalls nicht dargestellte Spindelantrieb angeordnet ist. Im oberen Bereich der Aufnahmebohrung für die Spindeltrommnl 2 ist im Spindeikasten 1 eine Ringnut 6 von beispielsweise 300° eingearbeitet. Der Kühlmittelzufluß in diese Ringnuten erfolgt über besondere Leitungen 7; 8. Um den Austritt des Kühlmittels in den Arbeits- bzw, Spannraum zu verhindern, sind die Aufnahmebohrungen 5 entsprechend abgedichtet. Das erwärmte Kühlmittel fließt durch einen Spalt zwischen der Spindeltromel 2 und dem Spindelkasten 1 ab, wird gesammelt und über die Leitung 9 einem Kühler 10 zugeführt. Das Kühlsystem besteht weiterhin aus einer Pumpe 11 und den Proportionalventilen 12; 13, die in Verbindung stehen mit den Leitungen 7 bzw. 8. An den Auflagozonen der Spindeltrommel 2 sind Temperaturmeßstellen 14; 15, die mit einem Regler 16 und einer Leistungsstufe 17 verbunden sind, über die die Proportionalventile 12; 13 angesteuert werden. Sofort bei Inbetriebnahme der Maschine wird die Ringnut 6 beider Tragscheiben 3; 4 mit dem maximalen Kühlmittelvolumen aus den zugehörigen Leitungen 7 bzw. 8 gespeist. Dabei wird permanent an den entsprechenden Temperaturmeßstellen 14; gemessen und im Regler 16 die Werte miteinander verglichen. Ist beispielsweise die Temperatur an der Meßstelle 15 höher als an der Meßstelle 14, wird die Ringnut 6 über das Proportionalventil 12 und Leitung 7 weiter mit maximalem Kühlmittelvolumen beaufschlagt. Parallel dazu wird die Fördermenge für die Ringnut 6 in der hinteren Tragscheibe 4 über das Proportionalventil 13 verringert. Damit wird ein der Kühlleistung entsprechendes Temperaturminimum erreicht. Die Proportionalventile 12; 13 werden mit dem im Kühler 10 befindlichen Kühlmittel über die Pumpe 11 versorgt. Das im Spindelkasten 1 angesammelte Kühlmittel wird durch die Leitung 9 dem Kühler 10 zugeführt. Wenn in beiden Meßstellen 14; 15 das gleiche Temperaturniveau herrscht, wird über den Regler 16 an beiden Proportionalventilen 12; 13 wieder die maximale Kühlmittelmenge eingestellt. Der Regelkreis ist so aufgebaut, daß stets an beiden Ringnuten 6 das gleiche Temperaturniveau durch Regulierung der Durchflußmenge an Kühlmittel herrscht. Damit ist die Kühlung der Spindeltrommel mit einer erzwungenen Konvektion direkt am Entstehungsort der Wärme gelöst.In the headstock 1 of a multi-spindle automatic lathes of conventional design with a horizontal machine main axis, the spindle drum 2 is mounted. It consists of a front support plate 3 and a rear support plate 4, which are interconnected by webs not shown, and between which the spindle drive, also not shown, is arranged. In the upper region of the receiving bore for Spindeltrommnl 2 an annular groove 6 of, for example, 300 ° is incorporated in the lock box 1. The Kühlmittelzufluß in these annular grooves via special lines 7; 8. In order to prevent the escape of the coolant in the working or, clamping space, the mounting holes 5 are sealed accordingly. The heated coolant flows through a gap between the spindle trommel 2 and the headstock 1, is collected and fed via the line 9 to a cooler 10. The cooling system further consists of a pump 11 and the proportional valves 12; 13, which are in communication with the lines 7 and 8 at the Auflagozonen the spindle drum 2 are temperature measuring 14; 15, which are connected to a regulator 16 and a power stage 17, via which the proportional valves 12; 13 are controlled. Immediately upon start-up of the machine, the annular groove 6 of both support disks 3; 4 fed with the maximum volume of coolant from the associated lines 7 and 8 respectively. It is permanently at the corresponding temperature measuring 14; measured and compared in the controller 16, the values. For example, if the temperature at the measuring point 15 is higher than at the measuring point 14, the annular groove 6 is further applied via the proportional valve 12 and line 7 with maximum coolant volume. In parallel, the flow rate for the annular groove 6 is reduced in the rear support plate 4 via the proportional valve 13. This achieves a temperature minimum corresponding to the cooling capacity. The proportional valves 12; 13 are supplied with the coolant located in the radiator 10 via the pump 11. The accumulated in the headstock 1 coolant is supplied through the conduit 9 to the radiator 10. If in both measuring points 14; 15 the same temperature level prevails, is via the regulator 16 on both proportional valves 12; 13 again set the maximum amount of coolant. The control loop is constructed so that always prevails at both annular grooves 6, the same temperature level by regulating the flow rate of coolant. Thus, the cooling of the spindle drum is solved with a forced convection directly at the origin of the heat.

Claims

Cooling device for multi-spindle automatic lathes with a spindle drum mounted horizontally in the headstock, characterized in that an annular groove (6) of, for example, 300 ° as part of a cooling circuit is incorporated in the upper region of the receiving bore (5) in the headstock (1) a cooler (10), a pump (11) and two proportional valves (12; 13) are arranged next to lines (7; 8; 9), wherein the proportional valves (i..; 13) are controllable by a control loop consisting of two measuring points (14; 15) of the temperature, a controller (16) and a power stage (17).

For this

2 pages drawings

Field of application of the invention

The invention relates to a device for cooling the Spinc'eltrommel of multi-spindle automatic lathes.

Characteristic of the known state of the art

Due to the friction in the bearings of the rotating spindles in the spindle drum of multi-spindle turning machines generate considerable amounts of heat. They lead to changes in the relative position between the workpiece and the tool. As a result, dimensional deviations occur on the workpiece.

Due to the different types of bearings and the resulting different amounts of heat and the heat transfer conditions between the front and rear support plate, the rotary spindles tilt in the radial direction, whereby form deviations arise on the workpiece. In the heated state, the receiving conditions for the spindle bearings are deformed by the multiple amount of allowable tolerance, which has a negative impact on the running behavior and thus on the life of the bearing.

In DE-OS 3724599 A1, a cooling system is described in which pipes are arranged between the two support disks of the spindle drum, in which the spindles are stored. From above these pipes are sprinkled for heat dissipation. This solution has the disadvantages that, as usual, the spindle drives with their clutches, gears, etc. between the support disks can not be arranged by the structural arrangement of the tubes, so that the drive can only be done from outside dor spindle drum. The heat generated in the bearings is only passed through the outer rings in the pipes and discharged only in the headstock with coolant. The cooling effect is low. Completely disregarded is the heat dissipation from the spindle itself.

Siel the invention

The invention has the goal of improving the dimensional and dimensional accuracy of machined on Muhrspindeldreheutomaten workpieces. Furthermore, an increase in the reliability of the spindle drum circuit and the life of the spindle bearings is achieved.

Explanation of the essence of the invention

The technical problem that is solved by the invention is to provide a device for the controlled cooling of the spindle drum of multi-spindle automatic lathes. The heat generation in the support zones of the support disks of the Sipindol drum is reduced by forced convection by means of a cooled medium. The temperature level in the support disks of the spindle drum is monitored and controlled uniformly, so that the basic machine accuracy is increased while increasing the thermal stiffness and reliability.

According to the invention the object is achieved by having the holes in the headstock for receiving the support disks of the spindle drum of a multi-spindle automatic horizontal type annular grooves. These annular grooves are incorporated in the upper region and, for example, 300 °, below are the support disks of the spindle drum.

Structure and effect of the cooling tower

The inflow for the coolant in the annular grooves via lines. The heated coolant is collected and fed via a line to the radiator. Via a pump, it reaches the proportional valves, which are connected to the lines to the annular grooves.

Structure and effect of the control loop

At the bearing points of the spindle drum measuring points are arranged for temperatures, which are connected to a controller and a power stage, by which the proportional valves are controlled. By this arrangement and its mode of action ensures that at deviating temperature level at one of the measuring points immediately on the controller the