DD291502A5 - DEVICE FOR COOLANT DOSING - Google Patents

Abstract

The invention relates to a device for influencing a Kühlmittelstromes on machine tools as a function of the effective cutting performance with the aim to keep the heat input as low as possible. Erfindungsgemaesz this is done by arranging a control valve, which is acted upon by the actuating torque of Umlaufradgetriebes, which is connected to the output shaft of the machine tool. The transmission of the adjusting torque is effected by a lever rotationally fixed to the carrier of the planetary gear {coolant flow; Control valve; Partial flow; Righting moment; Waermeeintragung; Cooling; Lever; Umlaufradgetriebe}

Description

Characteristic of the known state of the art

In the DDR-PS 249217 an apparatus for the automatic readjustment of a coolant jet during the grinding process is described in which the wear of the abrasive body serves as a contact size for the adjustment, but the flow rate is not affected.

However, depending on the grinding power heating of the workpiece requires effective cooling in the form of a dependent on the grinding power coolant flow. This goal is not achieved with the adjustment of the coolant flow at a constant distance to the contact point abrasive body / workpiece.

Another solution involves influencing the coolant flow by a hydraulically actuated control valve, which is controlled by the pressure in the supply line of the hydraulic motor of a hydrostatic grinding spindle drive and divides the coolant flow depending on the applied working pressure in the partial flow effective for the cooling and the partial flow flowing back to the coolant reservoir ( Reference WP B 24 B 3243500).

Object of the invention

The aim of the invention is to provide a device which allows the metering of a coolant flow as a function of the cutting power. This makes it possible to keep the workpiece temperature within narrow limits and to avoid the causes of hardening cracks, contort distortion and other negative consequences of impermissible local heating of the workpiece. Furthermore, the work results (dimensional stability, surface quality) are improved and the tool life is increased.

Explanation of the essence of the invention

The object of the invention is to influence a flow of coolant as a function of the cutting power in order to control the cooling of the workpiece according to dor by the amount of heat entered in the chipping, the workpiece temperature to be kept within narrow limits.

This object is achieved in that the output shaft of the grinding machine drives via a planetary gear dsn grinding wheel, wherein from the third wave of the epicyclic gear actuator torque is derived to a spring-loaded throttle valve. This causes that with increasing torque of the grinding spindle and thus with increasing grinding power an increasing flow of coolant is supplied to the processing zone and, conversely, with decreasing torque, the coolant flow is throttled accordingly.

Exemplary embodiment

The grinding body 2 in contact with the workpiece 11 is connected via a planetary gear 3 to the output shaft 1 of the grinding machine. The hollow shaft 12 of the epicyclic gear 3 is connected via the lever 4 and the coupling rod 5 to the throttle valve 7, which is acted upon by the spring 6. The coolant flow 8 passes through the throttle valve 7 via the connecting line 10 to the spray nozzle. 9

Claims (1)

Device for metering coolant, consisting of a per se known planetary gear (3) and throttle valve (7), characterized in that a with the hollow shaft (12) of Umlaufradgetriebes (3) rotationally connected lever (4) the adjusting torque to the throttle valve (7) transmits, which is biased by the spring (6). For this! Page drawing Field of application of the invention The invention relates to a device for influencing the flow of coolant on machine tools, preferably on internal or external cylindrical grinding machines for processing distortion-sensitive workpieces.