SU550247A1 - Method of cutting by run-in of arc teeth of bevel gears - Google Patents

Description

one

The invention relates to mechanical engineering, in particular to the treatment of gear teeth.

There is a known method of cutting by rolling the arc teeth of the conical wheels with a cutting head with slotted and profiling cutters. The radial installation of the incisors is carried out so that the surfaces formed by the incisors intersect outside the workpiece, which does not provide a flank on the teeth x but their length.

According to the proposed method, the flanking is performed by cutting cutters simultaneously with the cutting of adjacent teeth by profiling cutters, for which the radial installation of the cutters is carried out so that the surfaces formed by the cutters intersect at predetermined lengths of the teeth of the workpiece corresponding to the beginning of the flanks. This provides a flank on the teeth of the workpiece along their length.

FIG. Figure 1 shows the incisors; in fig. 2 shows a scan of the section of the teeth to be machined and the incisors to the initial surface in fig. 3 is a diagram of the formation of three flanks, the first option; in fig. 4 - the same, the second option.

The two sides of the head are the inner 1 and outer 2 incisors that profile the tooth 3 to be cut. The other two sides of the head are the outer 4 and inner 5 pro2

Carved cutters that form the rough surfaces of adjacent teeth 6 and 7. The external slotted 4 and internal profiling 1 cutters work in one cavity, the internal slotted 5 and external main 2 cutters in another, adjacent depression.

After a split transition to the profiling of the adjacent tooth, the surfaces formed by the slotted and profiling incisors intersect.

The intersection of these surfaces can occur in the limits or outside of the ring gear, depending on the ratios of the producing radii Г, Г2, r, г incisors. When machining the teeth without flanking, the surfaces formed by the profiling and slotted incisors intersect outside the ring gear, and the main incisors process the tooth along its entire length.

The flanking is performed with slotted cutters together with profiling when processing the adjacent teeth. The cutting head with the cutting tools 1, 2, 4 and 5 mounted on the production radii G, g, g, Gz, respectively, rotates around axis 8. The axis 8 of the cutting head is at a certain distance from the cone 9 of the cutting wheel. When the cutting head rotates in the direction indicated by the arrow, the main points of the cutting edges of the cutters 10–13 describe concentric circles, which on the gear rim 14–17 are the longitudinal lines of the working and flanking surfaces of the teeth being machined. The inner core cutter 1 profiles the convex side 18, 19 of the tooth 3, the outer core cutter 2 profiles the concave side 20, 21 of the same tooth. The outer slotted cutter 4 forms a concave flange surface 22, 23 of the adjacent tooth 6. The inner slotted cutter 5 forms a convex flange surface 24, 25 of the second adjacent tooth 7. After the side surfaces of the tooth 3 and the flange surfaces of the adjacent teeth are formed, the cut wheel is rotated by diving the division around the axis 9 with respect to the axis 8 of the incisal head on the angular pin 2P 2, the teeth to be cast, where fn is the number of teeth of the FLAT production wheel. FIG. 2, the relative division movement around the axis 9 is conventionally applied to the axis 8 of the cutting head, and two adjacent positions 26 and 27 of the axis of the head correspond to the profiling of the teeth 6 and 7 and flanking on both sides of the tooth 3. In the position 26 of the head, the cutter 5 forms a flanking surface 28, 29 which intersects with the lateral surface 18, 19, forms flanks 28, 30 and 29, 31 of length & h and b - on the convex side of the tooth. In position 27 of the head, the cutter 4 forms a flanking surface 32, 33 that intersects with the side surface 20, 21 and forms flanks 32, 34 and 33, 35 of length & 4 and b on the concave side of tooth 3. Flanging and profiling in one pass is achieved by special calculation and installation of the cutting radii of incisors ri, G2, G4, Gb and radial installation of the cutting head and. From the maximum possible four flanks, it is possible to form three flanks with a given length; the length of the fourth flank is dependent. With a normal length of three target flanks, the fourth flank is very short or does not form, or is too long. Of practical interest are options for forming three flanks without forming a fourth flank. There are two such options. FIG. 3 shows schematically in the initial plane the formation of three flanks, the first option. The flanks 6i, Zg and & Geometry of the convex side of the tooth 30, 31 with the flanks 30, 28 and 29, 31 are formed at a given length, and determine the radius-producing, 30, and 30 radial axes of the cutting head, 9, 26, 9 from the following conditions. The axis of the incisal head should be on the average perpendicular of 8, 36 to the chord 30.31 of the convex side of the tooth. The position of the chord is characterized by a chordal angle of inclination. and determines the width of the ring gear, the flanks of the ba and & s and the central 2P ". angle e, depending on the coefficient of overlap e. The centers of the radii ri and ge must be at points 8 and 26 of the intersection of the straight line 8.36 and the rays from the top of the initial cone 9.8 and 9, 26 forming angles equal to half the angular pitch , with perpendicular rom 9, 37 to the pr 8 my. In this case, the main points of the cutting edges of the incisors must be aligned at the points 30 or 31 of the intersection of the lateral and flanked surfaces of the convex side of the tooth. The radii of production, 35 and, 35, are determined from triangles 8, 9, 35 and 26, 9, 35, with the position of point 35 depending on the given value of the flange bi and the angular width of the depression (Tvp. Fig. 4 shows the formation of three flanks, The second variant. The flanks bz, & h and bi are formed at a given length. The geometries of the concave side of the tooth 34, 35 with flanks 32, 34 and 33, 35 determine the generating radii r 8, 35 and G4 27, 35 and the radial axis of the cutting head U 8, 9, 27, 9. The conditions for determining the radii Ha and G4 are similar to the conditions for determining the radii ri and Gb in the first embodiment. The heads should be on the average perpendicular to 27, 36 to the 34.35 chord of the concave side of the tooth.The position of the chord characterizes the chordal angle of inclination of the horn and determines the width of the ring gear, flanY2 and 4, and the central angle E. Radii G2 and G4 should be in points 8 and 27 intersections of straight lines 36, 27 and rays 9, 8 and 9, 27 forming corners — with perpendicular 9, 37 to straight lines 8, 36. The main points of the cutting edges must be aligned at points 34 or 35 of the lateral intersection. and flanking surfaces of the concave side of the tooth. The radii ri: 27, 30 and, 30 are determined from triangles 8, 9, 30 and 8, 27, 30, and the position of point 30 depends on a given flank length Lz and the angular width of the avvV depression one-sidedly loaded or non-reversible transmissions flank on one side of the tooth. The schemes for the formation of the two flanks are partial diagrams derived from the diagrams in FIG. 3 and 4, provided that the third flank is zero or negative. Equal high teeth of the flanked wheel have equal thickness along the entire non-flanked length. The longitudinal shape of the flanked depressions and the teeth of the twin wheel depends on the adopted flanking option. The first option of flanking (see Fig. 3) is preferred, in which the depressions of the flanked and the teeth of the pair of wheels receive a slight direct narrowing. In the second variant of flanking, there is a slight reverse narrowing of the flanked depression and teeth of the twin wheel. With the increase in the number of teeth of the flat plate, its wheel, the degree of contraction of the direct and reverse decreases. The shape of the teeth, cut with the flanking of the proposed method, is close to the ideal shape of equally high teeth.

Claims (1)

Invention Formula The method of cutting by rolling the arc teeth of the conical wheels with a cutting head with irioreznyh and profiling cutters, characterized in that, in order to ensure the flank on the teeth x along their length, the flanking is carried out by cutting notches simultaneously with the cutting of adjacent teeth by profiling cutters, for radial installation of the incisors t in such a way that the surfaces formed by the incisors intersect at given sections of the length of the teeth of the workpiece corresponding to the beginning of the flanks. " FIG. 2 g J7 j6e dog