SU1349912A1 - Inserted-blade hob cutter - Google Patents

Abstract

The invention relates to metal working, in particular to the machining of worm wheels with modular worm milling machines. The purpose of the invention is to improve the quality and performance by increasing the length of the tooth, therefore ,. and rigidity of the structure, improving manufacturability due to the possibility of sharpening the cutter assembly. The composite worm mill for machining the teeth under rolling conditions consists of draft 3, 4, 5, 6, sewed 2 and calibrated I discs. A tooth of each disc is placed on different turns of the screw screw. The circumferential length of the tooth is less than the circumferential pitch of the tooth. The teeth of the same blade lie on a common conical surface, and the blades of the teeth of the stripping and roughing disks are located inside the screw surface of the generating screw. 6 3. п. Ф-л, 6 Il. (L co 4 ;; co co i to FIG.

Description

ten

The invention relates to metal working, in particular to the machining of worm wheels with modular worm milling machines.

The purpose of the invention is to improve the quality and productivity by increasing the length of the tooth, and consequently, the rigidity of the structure, improving the manufacturability by creating the possibility of sharpening the cutter assembly.

FIG. 1 shows a precast cutter, general view; in fig. 2 - worm cutter with teeth of increased length; in fig. 3 - prefab milling cutter with a production w, im a worm (production w, s worm c is shown by a dotted line); in fig. 4 - one of the cutter discs; in fig. 5 - disk cutter with additional teeth; in fig. 6 is a view A of FIG. one.

The assembled screw-type cutter consists of a set of DIKS 1-6, equipped with teeth 7 with cutting blades 8 located on a screw surface I made, its worm is 20 ka. Disks include calibrated, i-disk 1, clear, agitating disk 2 and draft disks 3-6. A tooth of each disc is placed on different turns of the producing screw, for example, tooth 7 is placed in turn 9 of the producing screw, tooth 10 is placed in turn 11 of the producing screw. The circumference of the ab tooth is less than the circumferential pitch of the ac tooth. The teeth of the same blade 12-14 (left or right) lie on a common conical surface II. The blades 15 of the wiper disc 2 and the blades 16 of the rough discs 3-6 lie inside the screw surface 1 of the producing screw.

When the cutter rotates around the axis, each blade in space describes a conical surface, and the point of intersection of the right and left blades is a circle - the base of this cone. The distance between the bases of the conical surfaces of the adjacent disks ef is equal to the axial pitch Px of the multiple-worm-producing worm, when all the teeth of at least one of the disks are made with a height less than that of the other disks, and the thickness and location of the teeth of reduced height are determined by dependencies

fi

nt | wBo, lli-0, lhi

R (hi-Knm) + 4 (+

+ ye

hi

25

thirty

35

where fs is the tooth thickness of a reduced height;

m is the axial module of a multiple running worm;

(3 is the angle of elevation of the turns of the multiply producing worm; the distance from the axis of symmetry of the tooth of reduced height to the middle of cutting axis of the mill limited to the axis of symmetry of the teeth of reduced height most distant from each other;

li is half the length of the cutter axis segment, limited by the axes of symmetry of the teeth of the reduced height that are most distant from each other;

n is half the number of disks with teeth of reduced height;

g is the diameter ratio of a multiple-producing worm;

K is a numerical coefficient equal to 0.5-0.65;

R is the radius of the tops of the teeth of the machined worm wheel; distance from the top of the tooth of reduced height to the mill axis.

Claims (7)

Invention Formula . Combined worm drill for machining teeth in rolling conditions, consisting dl ka divided by the number of visits (the number is 40 from a set of disks equipped with teeth 45 This fact is not marked) and multiplied by the quad squad of the cosine of the angle of rise of the turns of the producing worm. In this case, variants are possible when the distance ef between the bases of the conical surfaces is made more than the axial pitch of the worm divided by the number of its turns, or it is equal to the axial pitch of the worm divided by the number of its turns. At least one disk of the milling cutter is provided with additional teeth 17, which are located relative to the main teeth along the turns of the multiple production. In this case, the teeth of all dial disks are made of the same thickness, or the teeth of at least one of the disks are made with a thickness less than that of the other teeth by an amount not exceeding half the axial module of a multiple-threading worm. 55 cutting blades located on the screw surface of the producing worm, characterized in that, in order to improve the quality and productivity in the manufacture of worm gears of multiple worm gears, the cutter is additionally equipped with cleaning and calibrating discs, with each tooth The teeth are located on different turns of the producing screw, the circumferential length of the tooth is less than their circumferential schag, the teeth of the same blade lie on a common conical surface, and the blades of the teeth of the stripping and roughing disks are located s inside the screw surface of the producing worm. 2. The milling cutter according to claim 1, characterized in that, in order to increase the manufacturability by sharpening the milling cutter assembly, the distances between the bases of the conical surfaces of the adjacent disks are equal There is a variant when all the teeth of at least one of the disks are made with a height less than that of the teeth of the other disks, and the thickness and location of the tips of the teeth of a reduced height are determined by dependencies fi nt | wBo, lli-0, lhi R (hi-Knm) + 4 (+ 0 + ye hi five 0 five where fs is the tooth thickness of a reduced height; m is the axial module of a multiple running worm; (3 is the angle of elevation of the turns of the multiply producing worm; the distance from the axis of symmetry of the tooth of reduced height to the middle of cutting axis of the mill limited to the axis of symmetry of the teeth of reduced height most distant from each other; li is half the length of the cutter axis segment, limited by the axes of symmetry of the teeth of the reduced height that are most distant from each other; n is half the number of disks with teeth of reduced height; g is the diameter ratio of a multiple-producing worm; K is a numerical coefficient equal to 0.5-0.65; R is the radius of the tops of the teeth of the machined worm wheel; distance from the top of the tooth of reduced height to the mill axis. Invention Formula . Combined worm drill for machining teeth in rolling conditions, consisting dl five g five cutting blades located on the screw surface of the producing worm, characterized in that, in order to improve the quality and productivity in the manufacture of worm gears of multiple worm gears, the cutter is additionally equipped with cleaning and calibrating discs, with each tooth The teeth are located on different turns of the producing screw, the circumferential length of the tooth is less than their circumferential schag, the teeth of the same blade lie on a common conical surface, and the blades of the teeth of the stripping and roughing disks are located s inside the screw surface of the producing worm. 2. The milling cutter according to claim 1, characterized in that, in order to increase the manufacturability by sharpening the milling cutter assembly, the distances between the bases of the conical surfaces of the adjacent disks are equal the axial pitch of a multiple running worm divided by the number of turns and multiplied by the cosine of the lifting angle of the worm producing turns. 3. A milling cutter according to claim 1, characterized in that, in order to increase the strength, the distances between the bases of the conical surfaces of the adjacent disks are made larger than the axial pitch of the multiple production, its screw, divided by the number of its turns. 4. A milling cutter according to claim 1, characterized in that, in order to simplify its construction, the distances between the bases of the conical surfaces of the adjacent disks are equal to the axial pitch of the multiple-threading worm divided by the number of its turns. 5.F;) but iin. 1 ii о, characterized in that, at least one disk from the set, is equipped with additional teeth, which are located relative to the main teeth along the turns of the multiple running worms. 6. Cutter on PP. 1-5, characterized in that the teeth of all the dial disks are made of the same thickness. 0 7. Milling cutter on PP. 1-5, characterized in that the teeth of at least one of the disks are made less than the teeth of the other disks by an amount not exceeding half the axial modulus of a multiple-feed worm. FIG. 2 Fig.Z Fy 17 FIG. five Compiled by V. Slitkova Editor E. PappTechred I. VeresKorrektor M. Sharoshi Order 4946/11 Circulation 970 Subscription VNIIPI USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and printing company, Uzhgorod, ul. Project, 4 Fi.6