SU1562074A1 - Method of adjusting head for cutting outside thread - Google Patents

Abstract

The invention relates to metal working, in particular threading. The purpose of the invention is the expansion of technological capabilities by creating the conditions for processing various sizes of threads. The threaded head, which is adjusted, comprises a housing with thread-forming elements of a segment shape, including cutting and deforming teeth. Coaxially to the body, a cylindrical template is established, against which the thread-forming elements are oriented, ensuring that the tips of the cutting teeth touch the outer surface and the front surfaces of the deforming teeth are displaced from the center of the cutting thread. 5 il.

Description

The invention relates to the field of metalworking, in particular, to thread cutting.

The purpose of the invention is the expansion of technological capabilities by creating the conditions for processing various sizes of threads.

FIG. 1 shows a diagram of the interaction of the thread-forming element with the part; in fig. 2 shows section A-A in FIG. one; in fig. 3 - template design; in fig. 4 - threading head; in fig. 5 is a view B in FIG. four.

The adjustment of the head for the formation of external threads is carried out as follows.

The threaded head comprises a housing 1 with grooves that coincide with their reference planes with the center of the thread being cut, working thread-forming elements 2, cover 3. Adjusting and fixing thread-forming elements 2 are adjustment screws 4 with lock nuts 5. Thread-forming elements 2 are tightened and fixed with 6 screws the reference planes of the housing grooves 1. The cover 3 is fastened with fastening screws 7 to the housing 1. The thread-forming elements 2 are made in the form of segments with cutting and deforming teeth. To set them up, a cylindrical pattern 8 is used, the outer diameter DI of which is equal to the inner diameter d0 of the thread being cut, which is set coaxially to the body. Then, the thread-forming elements are set relative to the template from the condition of touching the tops of the cutting teeth with its outer surface and displacing the front surfaces of the deforming teeth from the center of the cutting thread by an amount determined from the ratio

,

where a is the magnitude of the displacement;

С is the distance from the front plane of the cutting section to the line of contact of the inner diameter of the thread of the working element and outer diameter of the thread on the part;

(L

sd

0

go

about j

four

Z is the distance from the line of contact of the diameters Do and d to the front plane of the deforming tooth,

then, the thread-forming elements are fixed in the axial and radial directions with screws 4 and 6, and the template is removed.

After adjustment of the head, the process of threading is performed, and for cutting threads of various diameters with the same pitch, element 2 is moved in advance to a new diameter.

On the thread-forming element 2, the cutting teeth are made in section 1 and the deforming teeth in section 1h, and they are made in one segment.

Claims (1)

Invention Formula The method of adjusting the head for cutting external threads with several thread-forming elements placed in the grooves of the housing evenly around the circumference, made in the form of segments with cutting and deforming teeth, the front surfaces of which are displaced relative to the center of the thread being cut, which differs. that, in order to expand technological capabilities, use a cylindrical pattern with an outer diameter equal to the inner diameter of the thread being cut, which are aligned with the body, then the thread-forming elements are set relative to the pattern, ensuring that the tops of the cutting teeth touch the outer surface and offset the front surfaces teeth from the center of the thread being cut by an amount determined from the ratio , where a is the magnitude of the displacement; C is the distance from the front plane of the cutting section along the line of contact between the internal thread diameter of the workpiece and the external thread diameter on the part; 2 shows the distance from the line of contact of the diameters DO and d to the front plane of the deforming tooth, after which the thread-forming elements are fixed and the template is removed. LD 1 d FIG. g h Have at Fig.z W