RU2445195C1 - Thread cutter head - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: proposed cutter head consists of two half-heads in radial grooves of which cutters are mounted in two planes at the distance equal to length of common normal line to form sector free of cutters for teethe segmentation. To up the quality of cut gear wheels by decreasing error in their profile, cutters forming tooth profile from tip to root are fitted in half-head with monotonically increasing pitch while cutters forming tooth profile from root to tip are arranged therein with monotonically decreasing pitch.

EFFECT: higher quality of tooth cutting.

2 dwg

Description

The present invention relates to the field of machining and can be used for gear cutting of cylindrical gears by the method of rolling.

Known incisor head (see Pat. 2306210 C1, Russian Federation, MCP B23F 21/14 dated 09/20/2007. Bull. No. 26. Cutter head / Fedorov Yu.N., Artamonov VD, Zolotukhina OL) for preliminary gear cutting with a monotonically increasing circumferential pitch of the location of interchangeable cutters in one plane in the head housing within an incomplete turn with the formation of a sector free of cutters for dividing the workpiece into a tooth.

The main disadvantage of this incisor head is the formation of concavity of the lateral surfaces of the teeth, which excludes the possibility of its use for the final machining of spur gears.

The closest in technical essence (prototype) is the incisor head (see article in the collection of scientific papers "Technology of machining and assembly", Tula, 1993, p.40-46. Fedorova Yu.N. "Disk incisor heads for z-fold rolling gear-pulling of cylindrical wheels ”) for z-fold rolling gear-pulling of cylindrical wheels, consisting of two half heads, with cutters located in two planes at a distance of the length of the common normal.

The main disadvantage of this tool head is the uneven distribution of the cut face (Δ) of the machined teeth of the wheel and in the absence of the ability to control the size of the error profile (f _f ).

The objective of the invention is to improve the quality of gears by reducing the error profile of the cut teeth by controlling the process of shaping the lateral involute surfaces of the teeth.

The problem is solved in that in the proposed incisor head, consisting of two half heads, in radially spaced grooves of which in two planes at a distance of the length of the common normal, incisors are installed with the formation of a sector free of incisors for dividing by a tooth, incisors forming a tooth profile from apex to the bases are installed in a half-head with a monotonically increasing pitch, and the incisors forming a tooth profile from the base to the apex are installed in a half-head with a monotonously decreasing pitch.

The essence of the invention is illustrated by drawings, where figure 1 shows the relative position of the cutter head and the workpiece, figure 2 is a diagram of a gear cycle with one-sided rolling.

The incisor head contains a right half head 1 with a number of incisors 2 installed with a monotonously increasing pitch, forming a tooth profile from the top to the base, and a left half head 3 with a number of incisors 4 installed with a monotonously decreasing step, forming a tooth profile from the base to the top, which are installed on a common mandrel 5. On the machine table is located obkatno-dividing device, providing the workpiece 6 coordinated movement of the run-in.

Before processing, the workpiece 6 is installed in the sector free of incisors of the incisor head, to the full height of the tooth relative to the incisors 2 and 4 of the half head 1 and 3.

Dental treatment begins from the moment of profiling by the cutting edges of the first cutter 2 of the right half head 1 of the top of one tooth of the workpiece 6 and the first cutter 4 of the left half head 3 of the base of the other tooth of the workpiece 6. The workpiece 6 makes coordinated rolling movements until the lateral opposite surfaces of the two teeth are formed at a distance lengths of the general normal. Then, during the passage of the cutter-free sector of the cutting head, the workpiece 6 should be returned to its original position and divided by a tooth, after which the tooth treatment cycle is repeated until the gear is finished.

The location of the incisors in half heads with a monotonously varying step ensures that the height of the profile-cut combs is aligned with the average value Δ _cp = const, i.e., its decrease compared to the maximum by about 2 times, thereby reducing the profile error f _f and a corresponding increase in the accuracy of the machined gear wheels according to the norms of smoothness of work for 2 degrees of accuracy according to GOST 1643-81.

The proposed cutter head allows you to improve the quality of the gears by reducing the error profile of the teeth with a constant number of cutters.

Claims (1)

The incisor head, consisting of two half heads, in the radially located grooves of which in two planes at a distance of the length of the common normal, incisors are installed with the formation of a sector free of incisors for dividing by a tooth, characterized in that the incisors forming the tooth profile from the top to the base are installed in a half-head with a monotonically increasing pitch, and the incisors forming a tooth profile from the base to the apex are installed in a half-head with a monotonously decreasing pitch.

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