SU1581837A1

SU1581837A1 - Bit for percussive-rotary drilling

Info

Publication number: SU1581837A1
Application number: SU874360994A
Authority: SU
Inventors: Юрий Федорович Авдонин; Александр Сафронович Курдюков; Сергей Викторович Дайбов; Илья Данилович Плеханов
Original assignee: Кыштымский машиностроительный завод им.М.И.Калинина
Priority date: 1987-11-17
Filing date: 1987-11-17
Publication date: 1990-07-30

Abstract

Изобретение относитс к горной промышленности и позвол ет увеличить срок службы долота дл ударно-вращательного бурени за счет повышени надежности креплени твердосплавных вставок на периферийном наклонном участке породоразрушающей головки долота. Долото содержит корпус с породоразрушающей головкой 2. На рабочем торце головки 2 имеютс гнезда 3, часть из которых размещена на периферийном кольцевом участке (ПУ), расположенном под углом к оси долота. ПУ выполнен в поперечном сечении вогнутым с центрами кривизны, лежащими на ос х гнезда 3. Внешн кромка 5 вогнутой поверхности ПУ находитс между ее внутренней кромкой 6 и окружностью 7, вл ющейс геометрическим местом точек пересечени осей гнезда 3 с вогнутой поверхностью ПУ. В гнезде 3 посредством пайки закреплены твердосплавные вставки 8. Желобообразна форма ПУ задерживает в процессе пайки припой, что обеспечивает полное заполнение всех па ных швов вставок 8 на ПУ. В результате качество пайки этих вставок улучшаетс . 1 з.п. ф-лы, 2 ил.The invention relates to the mining industry and allows to increase the service life of the bit for percussion rotary drilling by increasing the reliability of fastening carbide inserts on the peripheral inclined section of the rock cutting head of the bit. The bit includes a body with a rock-breaking head 2. At the working end of the head 2 there are slots 3, some of which are located on the peripheral annular section (PU) located at an angle to the axis of the bit. The PU is made in cross section with a concave center of curvature lying on the axes of the socket 3. The outer edge 5 of the concave surface of the PU lies between its inner edge 6 and the circumference 7, which is the geometric location of the points of intersection of the axes of the socket 3 with the concave surface of the PU. Carbide inserts 8 are fixed in solder 3 by soldering. The groove-like shape of the PU delays the soldering process in the process of soldering, which ensures that all solder joints of the inserts 8 on the PU are completely filled. As a result, the soldering quality of these inserts is improved. 1 hp f-ly, 2 ill.

Description

Фиг. 2FIG. 2

Claims

Claim

1, A rotary hammer bit, comprising a body with a shank and a rock cutting head having nests on the working end, some of which are located on a peripheral annular section located at an angle to the axis of the bit, and carbide inserts fixed in the nests by soldering, characterized the fact that, in order to increase the life of the bit by increasing the reliability of fixing the inserts on the peripheral inclined section, the latter is made concave in cross section, while the centers of curvature of the concave surface STI sockets lie on axes, and the outer edge of the surface situated between its inner edge and the circumference, which is the locus of points of intersection of the axes of the concave socket surface of the peripheral portion.

2. Chisel pop. 1, which is a fact that the radius of curvature of the concave surface of the peripheral section is from 1.1 to 1.3 of the radius of the nests located on it.

FIG. 2