DD225364A1 - PROCESS FOR MULTIPLE SCREW GRINDING - Google Patents

Abstract

The invention relates to a method for mehrgaengigen Schraubwaelzschleifen kleinmoduliger serrations with a particularly large Zaehnezahl, as these are mainly used in gearbox construction in corrugated gears. The invention has the object of this kind spur gears produce high productivity without grinding errors such as burns and sanding cracks. The task is solved by working with four-sided profiled grinding worms, the profiling taking place with two diamond disk sets composed of two diamond disks each spaced apart from the grinding worm pitch.

Description

usführungsbeispiel

The inventive method will be explained below with reference to a figurative representation and the required calculations.

3 mean:

Starting position 0 degrees of the grinding worm and the dressing device for profiling of the gears 1 and 2 Position 180 degrees of the grinding worm and the dressing device for profiling the gears 3 and 4 left diamond disk set

right diamond disk set around process: The width of the grinding zone on the workpiece circumference is calculated to

K / v ü J ^ f

with / "ax CLUS cos f _mQX = / -

The engagement time of the grinding worm with any point of the workpiece edge zone as a measure of the propagation time he heat in the workpiece is:

, & S Z frr> Qx -,

^£ T d _a GZ-n _WZ il d _Q

nd is thus inversely proportional to the number of turns of the screw. Consequently, the heat load decreases with the same * / stoffstoffabtrag per unit time with increasing number of flights of the screw and the time voltage volume Q _n increases approximately correspondingly

Q _z t ^ T = T ~ ¹ JgZ

ntsprechend the solution shown in the drawing, the grinding worm 1, which is rotatably mounted on the grinding spindle of a not-shown machine tool and is arranged via a special transmission, wherein the Setriebe with an adjustable synchronous between the Schieifschneckendrehung and the reciprocating movement of the rotating diamond disc sets 2 and 3 is formed. The profiling is carried out by the left 3 and true diamond disc set 2, in each case two diamond discs are arranged at a distance of the worm gear increase according to ler division of the teeth to be ground. Thus, the left 3 and the right diamond wheel set in the output angular position of the grinding worm of zero degrees in accordance with the position I together produce gear 1 and 2. In a second operation are then after rotation of the grinding worm by 180 ° in the fixed position Il the song 3 and 4 profiled.

Claims (1)

Invention claim: A method for multi-course Schraubwälzschleifen kleinmoduliger front teeth, with a particularly large number of teeth, characterized in that by profiling the grinding worm threads 1 and 2 in the O ⁰ position with subsequent profiling of the grinding worm threads 3 and 4 in the 180 ° position of the grinding worm, by means of two on a diamond disk apparatus arranged diamond disk sets a four-speed profiling is achieved, wherein in each case two diamond discs have a distance of the worm gear increase according to the pitch of the spur toothing. For this 1 page drawing Field of application of the invention The invention relates to a method for multi-course Schraubwälzschleifen kleinmoduliger front teeth, with a particularly large number of teeth, through which both the thermo-mechanical workpiece edge zone stress, and the necessary grinding time is lowered. Characteristic of known technical solutions In the helical gear grinding of spur gear teeth introduced in gear cutting technology, the cylindrical involute toothing is ground by a grinding tool with helical profile, which embodies a toothed rack profile in the end cut. Both single- and double-flight grinding worms are used. The use of such grinding worms is in the module range m ^ 3,5mm. The grinding worm profile is produced both with diamond bits for moduli of 0.5 mm and with diamond disks for modules of 0.20 mm diameter. The profiling and dressing of two-start grinding worms is carried out in the module range m = 0.2 ... 1.5 mm in one operation using diamond disk sets consisting of spaced apart a whopping number of pitches arranged two left and two right diamond wheels, and in the module range m ^ 0,5mm in two operations by profiling the first gear in the grinding wheel position 0 ° with a subsequent profiling of the second gear in the grinding wheel position 180 ° by means of diamond chisel pair (left and right diamond chisel) or a left and right diamond diamond wheel pair. The use of double-flighted grinding worms is associated with an increase in productivity with limited geometric accuracy of the involute profile. When Schraubwälzschleifen kleinmoduliger teeth especially with large numbers of teeth occurs due to the large contact surface between grinding worm and produced toothing on a large thermo-mechanical load on the workpiece edge zone, which often lead to damage to the workpiece in the form of burns and grinding cracks, so that these workpieces are no longer usable. As a result of such forms of knowledge, a reduction of the cutting values is made, since due to high grinding speed of 30m / s and more, the cooling liquid is thrown off the workpiece. To alter these deficiencies, a device has been proposed which operates on an oil-based cooling basis and in which the grinding worm with the workpiece is immersed in an oil bath. The machining of the workpiece thus takes place in the lubricant bath. As advanced as this working method seems to be, but it is liable to the disadvantage that previously used machines need to be re-equipped and the consumption of the cooling media is more expensive, which is not even sure that similar disadvantages due to the enormously high operating speeds to enter the known facilities. Object of the invention The invention has set itself the goal of avoiding the thermo-mechanical edge zone damage during grinding by changing the dressing process and additionally achieving an increase in labor productivity. Explanation of the essence of the invention The invention has for its object to provide a method that works with support of a purpose designed arrangement of grinding worms machining errors, such as these. B. in high-speed grinding, completely shut down and beyond to increase productivity. According to the invention this object is achieved in that by a combination of the two principles of dressing zweigängiger grinding worms with two sets of diamond sets in two separate operations namely profiling of the gears 1 and 2 in the grinding wheel position 0 ° and the gears 3 and 4 in the grinding wheel 180 ° Four-speed grinding worm profile is generated. By using four-speed grinding worms reduces the residence time of each point of the workpiece edge zone and the contact zone between grinding worm and teeth by half, so that the heat propagation into the workpiece, which occurs until the intense impact of the production aid when exiting the considered point of the workpiece edge zone from the grinding zone , is reduced and thus thermomechanical workpiece damage in the form of burns and / or sanding cracks are avoided.