SU901005A1 - Milling cutter for cutting cylindrical gears with non-symmetrical undercut tooth - Google Patents

Description

The invention relates to tools used when working on gear cutting machines, in particular tools for the manufacture of cylindrical wheels with an asymmetrical, undercut tooth profile, and can be used in the instrument-making industry for the manufacture of anchor wheels.

Known special screwdriver for cutting teeth of anchor wheels according to the rolling method, the teeth of which are located along a helix c. within one turn, and the profiling cut is carried out only by one tooth located at the greatest distance from the axis of rotation of the milling cutter, due to the eccentric fixing of the milling cutter. Each cutter tooth has two cutting protrusions 1.

In the above mentioned worm milling cutter, about half of the teeth are involved in the work, and one in the formation of the profile. During operation (for the entire service life), four to five orientations of the cutter to the main tooth, i.e. turns cutters on the eccentric sleeve. Each cutting tooth cutter has only two cutting protrusions. All the above reduces the wear resistance of the cutter and productivity.

The purpose of the invention is to increase processing performance, increase the wear resistance of the cutter.

This goal is achieved by the fact that each subsequent tooth of the cutter is rotated relative to the previous tooth around the center of the wheel to be cut or the package of wheels to be cut at an angle

 60 °. where Z is the number of teeth nare fKZu,

Zu is the number of teeth of the cutter, with each tooth of the cutter being profiling.

The number of cutting protrusions of the tooth of the cutter is three to four.

FIG. 1 shows the cutter, a general view; in fig. 2 shows successive positions of the cutter teeth profiles (lu.

Yuts)

5i bts., 7a,

2ts, 3

at the moments of the passage of the plane P passing through the milling cutter and perpendicular to the plane of cutting; in fig. 3 - protrusions 1 - 3 and a hollow of 4 teeth of the cutter (marked sections of the profile 5 of the anchor wheel, cut by them); in fig. 4 - cutting process

Claims (2)

30 anchor wheel frezoy. Tooth cutting is performed according to the rolling method, i.e. In 1 revolution of the cutter, the wheel being cut turns one-step or through an angle °° -, and by an angle --- when turning the cutter by 1 tooth. The milling cutter shown in FIG. 1 has 10 teeth. The profile of the first tooth 1a (remote element 1 in FIG. Is calculated and constructed according to already known rules. The profiles of the subsequent teeth of the cutter are a copy of the profile of the First tooth, but differ from it and from each other in a different arrangement in space relative to the center Oi. For example, when the cutter rotates around its axis 0-0 (Fig. 2), the profile of the second tooth (2c,), when it passes the plane P, is rotated relative to the profile of the first tooth (lu,) around the center Of the cutter wheel HZvO at an angle; profile a third go tooth (For) rotated relative to the second t kzhe angle y, etc., with the result that the profile of the tenth tooth (10i) is rotated relative to the first angle (Zi - 1) around the center O. Rotate the tooth profiles follow the arrow A ,. Each tooth of the cutter has several protrusions and a hollow that carry out profiling cuts to certain sections of the surface profile of the wheel being cut. Protrusion i cuts and profiles sections 1 - 2 and 2 protrusion 2 - sections 4 - 5 and b - 7, projection 3 - sections 10 - 11 and 1112 . Itadin 4 - section 8 - 9 (Fig. 3 ,. While y-jpj 1c milling cutter performs its profiling cut on profile 5 of the cutting wheel. And gives up its place to the 706th {2h.} tooth (Fig. 4), profile 5 10%: The position indicated by the number 6, therefore, the second tooth (2i,) for the extension; you must catch the ILL PROFIL, cut by the tooth, in connection with the check is located in space so that when it passes the plane P, its profile is rotated relative to Mr. Rofil of the first tooth around the O. price of the cut The same wheel can also be said about the third and other teeth of the cutter, i.e. each subsequent tooth of the cutter is rotated relative to the previous one by an angle. Thus, if we consider only one projection, 3 cutter teeth work to simplify (Fig. 4 ), it can be seen that during the first revolution of the milling cutter, the projections 3 of all ten teeth produced profiling cuts between teeth C and C (see the positions of the tooth profiles lu ,, 2u. P 3u, 4a, 5a, bi., ILL, 8h -, 9 and-, lOu.), After one revolution of the cutter, tooth C takes the place of tooth B, and tooth D takes the place of tooth C. At the second turn, The protrusions of the 3 teeth of the cutter process the cavity between the teeth C and D, etc. If the anchor wheel has Z teeth, then for 2 and rotations of the cutter, the projections of 3 teeth will be in all 2p. cavities of the cut wheel. In the future, the cutting process is repeated and, when the cutter communicates the feed movement, the Cs (mm / 1 tooth) continues until the full cutting of the wheel (package of blanks). The use of the proposed cutter improves the processing performance of the operation. Cutting the tooth by 2 times, and the wear resistance of the cutter - by 3, times. Claim 1 ,. A mill for cutting cylindrical wheels with an asymmetrical, undercut tooth profile, working according to the rolling method, each tooth of which has several protrusions and cavities, cutting edges of which are designed to form certain sections of the profile of the wheel being cut, characterized in that With respect to the wear resistance of the cutter, each subsequent tooth of the cutter is rotated relative to the previous tooth around the center of the wheel being cut by an angle, where% "is the number of teeth of the wheel being cut and Zt.i.- The number of teeth of the cutter, so that each cutter tooth is a profiling. 2. The milling cutter according to claim 1, characterized by the fact that the number of cutting protrusions of the milling tooth is three to four i. Sources of information taken into account in the examination 1. Special worm mill for cutting teeth of anchor wheels according to the rolling method. RTM 14-68. NIISHasprom, 1968. 5u Lll 9u 1 (rig, 5 FIG. four