SU965652A1 - Flying milling cutter - Google Patents

Description

one

The invention relates to the manufacture of gears, and more particularly to cutters for the cutting of teeth of wheels of modified globoid gears.

A known milling cutter for cutting globoid gear wheels with a modified worm, comprising a middle cutter, the cutting edges of which are made located on the globoid surfaces, and two extreme cutters.

The lack of a milling cutter lies in the fact that it does not provide localization of the contact spot in the initial period of operation of the transmission, which, in the presence of unavoidable errors in manufacturing and installation, leads to a decrease in load capacity and efficiency.

The aim of the invention is to increase the load capacity and transmission efficiency in the initial period of operation.

This goal is achieved by the fact that in the mill-cutter the cutting edges of the extreme incisors are shifted relative to the globoid surfaces by 0.3-0.5 magnitudes of the modification of the globoid screw.

(54) MILLS

FIG. 1 shows a milling cutter, a general view; in fig. 2 is a section A-A in FIG. one; in fig. 3 is a section BB in FIG. one; in fig. 4 is a diagram of the shaping of a tooth of the globoid wheel when cutted by a milling cutter.

The milling cutter contains the mandrel 1 and the two extreme cutters 2, 3 and the middle cutter 4 inserted into it. The middle cutter is two-sided and serves to form

, Q of the obratny, zones on both sides of the cavity between the teeth, and the extreme incisors are one-sided and are intended to profile the cutting areas of the tooth surface. The middle cutter is based on a rectangular profile groove in the mandrel. The base cutters are based on the axial plane B and the base studs 5. The middle cutter is fastened with screw 6. The extreme cutters are fixed with crackers 7 and screws 8.

Claims (1)

20 The cutting edges 9 and 10 of the middle cutter 4 are located on the globoid surfaces G and r. The globoid gear wheel 11 is in machine engagement with the frezuechuchku. The position of these cutting edges also coincides with the position of the machine-tooling wheel depressions forming the av, i.e. the CORNER of the profile (Uj, and the thickness of the cutter SQ along the chord of the pitch circle are determined by the expressions jUo t + i2o; 5, djosine ,,, where (Ord / Ago is the Itel angle of the coil profile in the axial section in the middle of the screw (half the theoretical angle of the loop); DPQ-diameter of the machine circle; d, 2a-dj — diameter of the machine division circle;} - the separating diameter of the globoid screw; One machine center distance when processing the screw; Q 0,6tg-tf.jQ-halves and the angular width of the depression of the machine wheel; o.- S60 / Z, UQ is the angular pitch of the machine wheel; 2 is the number of visits of globoid blueberries; Ug is the machine gear ratio when processing the screw; Mzo rcsinlSa / JjjiCoey, is half the ANGULAR tooth thickness of the machine scaffolding; 5,, l-given divisional thickness along the wheel chord; YQ - separating maximum angle of elevation of the coil line of the globoid worm. The cutting edges 12 and 13 of the extreme incisors are shifted relative to the globoid surfaces G and D to the middle of the milling cutter by the value of t. measured normally to the generators of these surfaces s component and 0.3-0.5 magnitude d of the screw modification. In this case, the angle of location (U of the extreme cutting edges and the distance l between the extreme points of these edges are determined by the expressions. -O xT-o n lo I ---- I Tn (Oro-2lT) so5 / and -l | sz, Q-Dpo U where Z is the number of steps between the cutting edges of the extreme and middle incisors of the same name, and the diameter of the depressions of a hundred night wheel. The efg curve shows the trace of the cutting edge 10 of the middle cutter in the XyZ coordinate system rigidly connected to the wheel being processed. cutting edge 12. Curve hlfmk outlines the longitudinal line of the side surface of the wheel tooth, floor The curve prg shows the trace of the movement of the generator cd. The curve sftu is the cross section of the surface of the coil of the modified globoid screw. The process of cutting by the cutter-bat is as follows: The mill cutter rotates at an angular velocity w, which is associated with an angular the speed W2 of rotation of the wheel 11 globoid gear ratio ratio JJ Wi Zz 1 E77 where 22 is the number of teeth of the cut wheel. The depth of the rolling area of the surface sftu, defined along the X axis by the Vf segment, is equal to the magnitude of the modification measured along the normal to the profile at the worm entrance. The tangency of the Sft curve with the Ifm line, and therefore, the localization of the initial contact between the active surfaces of the screw and the wheel takes place at the point f located near the midplane of the wheel 11. The offset of the cutting edge 12 relative to the generator cd is equal to L1 equal to the segment pi and 0.3-0.5 .UQ values, thus avoiding interference of active surfaces in the area of the curved triangle W & W. The proximity of the Sft and Ifm curves determine the good transmission transmission and the rapid spread of the contact spot over the entire width of the well. As a result of using the milling cutter, the amount of metal to be smothered during the burn-in process until a predetermined contact spot width is reached (25-45 / o the width of the wheel tooth) is reduced. Increased load capacity and transmission efficiency, increased service life. Claims of the Invention Mill-cutter for cutting the wheels of globoid gears with a modified screw, containing an average cutter, the cutting edges of which are made located on the globoid surfaces, and two extreme cutters, characterized in that, in order to increase the load capacity and efficiency n RVDZchi the initial period of operation, the cutting edges of the extreme incisors are shifted relative to the globoid surfaces by 0.3-0.5 magnitudes of the modification of the globoid screw. Sources of information taken into account in the examination 1. Zhuravlev V. L. Technologists of manufacturing globoid gears. M., “Mechanical Engineering, 1965, p. 95-101. Aa Uz.l 5-6 Fig.Z Ф14г.