SU1228985A1 - Thread-cutting head - Google Patents

Description

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The invention relates to metalworking cutting and can be used for cutting outer cylindrical and KOHiinecKHX threads.

A thread-cutting head is known, comprising a housing with a pressure ring with bevels and cams with round dies installed therein and an emphasis, with curved surfaces interacting with the beams on the pressure rings on the cams. The head is completed with a large number of cam sets, each of which is intended for cutting a specific thread size ij.

A disadvantage of the known design B is the presence of a large number of sets of cams, which are complex, exact and labor-consuming parts to be made. Each set is designed for a specific thread diameter.

The purpose of the invention is the expansion of technological capabilities.

The goal is achieved by the fact that in a thread-cutting head comprising a body in which cams connected to thread-cutting dies are installed, a pressure ring with a bevel and an emphasis, the working surfaces of the cams interact with the bevels of the pressure ring, the cams are installed with the possibility of fixed rotation around the axis and on they are made additional working surfaces, and the bevels on the pressure ring are made in a spiral of Archimedes.

A cam has a groove with grooves for interacting with the stop.

FIG. 1 shows a head, a general view; in fig. 2 -T-shaped groove in the head housing; in fig. 3 - continuous groove with grooves in the cam; in fig. 4 - the interaction of the curvilinear surfaces of the cams with the bevels of the pressure ring.

The die head consists of rfie6eHOK 1 planted through a gear sprocket on the cams 2, having the ability to move in the radial T-shaped grooves 3 of the housing 4. The T-shaped grooves 3 are rotated relative to the axis of the head at an angle (approximately equal to the angle of the thread lift). In the case 4, a row with T-shaped grooves has holes in which springs 5 are inserted.

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By the action of the springs 5, the cams 2 abut against the curved surface 6 (FIG. 3) into the bevels 7 of the pressure ring 8. The rear side 9 of the cam 2 has a groove 10 with a 5 grooved surface into which the stop 11 is inserted. A handle assembly 12 is connected to the pressure ring 8 The head mechanism is based on the shank 13 connected by p - tO and prodigious parts with a pressure ring 8 and a housing 4. At the rear end of the pressure ring 8 there are two adjusting screws that can be moved by pressing the 5 Rings relative to the body 4.

The head works as follows.

The head is mounted on the wall, for example, in the tailstock quill of the lathe, and is fed in the axial direction onto a rotating workpiece mounted in the chuck of the machine spindle. Threading is carried out by combs using the self-engaging head jets method. Upon reaching the required length, the shank 13 of the head stops, while the body 4 together with the combs 1 and the cams 2 continues the axial movement. This causes the cams 2 to go beyond the end face of the pressure ring B and, due to the nyyiKtm 5 and the stops 1 1, are diluted in the radial direction, freeing the comb from engaging the thread of the part, which allows the head to be moved to its original position. The closing of the head, i.e., the return of the cams and dies to the initial position, is carried out with a handle.

Adjusting the head to a different size is accomplished by swapping all the cams from the first groove into the next one, for example clockwise, with the last cam at the same time being rotated 180. In this case, the curved surfaces of the cams interact with the bevels of the pressure ring, arranged in an Archimedes spiral, the step of which I is equal to the difference of the distances between the center of rotation and the curvilinear surfaces 1;

The use of the proposed design of the thread-cutting head will significantly reduce the metal intensity of the head assembly with cams.

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Editor A. Sabo

Compiled by A. Klimov Tehred V. Kadar

Order 2403/10 Circulation 1001Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Proofreader A. Ferenc

Claims (2)

1. A THREADING HEAD, comprising a housing in which cams are mounted associated with thread-cutting combs, a pressure ring with bevels and an abutment, the working surfaces of the cams interacting with the bevels of the pressure ring, characterized in that, in order to expand technological capabilities, the cams are installed with the possibility of a fixed rotation around the axis and the working surfaces are made on them, and the bevels on the pressure ring are made in a spiral of Archimedes. 2. Head pop. 1, characterized in that the cam groove is made with a groove for interaction with the focus. <5