SU1268322A1

SU1268322A1 - Broaching tool for working cylindrical concave surfaces

Info

Publication number: SU1268322A1
Application number: SU843824951A
Authority: SU
Inventors: Александр Григорьевич Шеменев; Михаил Андреевич Миронов; Евгений Данилович Антипов; Валерий Александрович Кожухарь
Original assignee: Ростовский научно-исследовательский институт технологии машиностроения
Priority date: 1984-10-29
Filing date: 1984-10-29
Publication date: 1986-11-07

Description

Изобретение относится к металлообработке и может быть использовано при обработке цилиндрических вогнутых поверхностей протягиванием.The invention relates to metal working and can be used in the processing of cylindrical concave surfaces by pulling.

Цель изобретения - повышение про- 5 изводительности обработки путем увеличения припуска, снимаемого каждым зубом.The purpose of the invention is to increase the productivity of processing by increasing the allowance removed by each tooth.

На фиг.1 показана протяжка для обработки цилиндрических вогнутых 10 поверхностей; на фиг.2 - сечение А-А на фиг.1.Figure 1 shows a broach for processing cylindrical concave 10 surfaces; figure 2 is a section aa in figure 1.

Протяжка содержит переднюю направляющую 1, заднюю направляющую 2 и режущую часть 3, выполненную из последовательно расположенных зубьев 4. включающих режущие лезвия 5 и стружечные канавки 6.The broach contains a front guide 1, a rear guide 2 and a cutting part 3 made of sequentially arranged teeth 4. including cutting blades 5 and chip grooves 6.

Режущие лезвия 5 образованы поверхностью вращения радиусом К с цент- 20 ром в точке О . Стружечные канавки 6 образованы поверхностью вращения с радиусом по впадинам г с центром в точке О, , смещенным относительно точки 0 на величину эксцентриситета е . 25The cutting blades 5 are formed by a surface of revolution of radius K with a center of 20 at a point O. Chip grooves 6 are formed by a surface of revolution with a radius along the depressions g centered at point O, offset from point 0 by the amount of eccentricity e. 25

Величина эксцентриситета е рассчитывается из следующего математического соотношения: ____ ^R ’ 30 где к -радиус окружности режущего зуба;The magnitude of the eccentricity e is calculated from the following mathematical relationship: ____ ^R '30 where k is the radius of the circumference of the cutting tooth;

h - минимально допустимая -по помещаемости глубина стружечной канавки;h is the minimum allowable chip depth of the chip groove;

Н - длина проекции рабочей части ³⁵режущего лезвия в плоскости, проходящей через центр режущего лезвия и поверхность стружечной канавки;H is the projection length of the working part ^{35 of the} cutting blade in a plane passing through the center of the cutting blade and the surface of the chip groove;

г - радиус окружности впадин стружечной канавки.g is the radius of the circumference of the depressions of the chip groove.

Такое конструктивное решение протяжки с эксцентричным расположением режущих зубьев и стружечных канавок обеспечивает увеличение площади опасного сечения протяжки по впадинам зубьев, а следовательно, увеличение припуска, снимаемого каждам зубом, и соответственно повышение производительности операции протягивания цилиндрических вогнутых поверхностей.Such a design solution of the broach with an eccentric arrangement of cutting teeth and chip grooves provides an increase in the area of the dangerous section of the broach along the tooth cavities, and consequently, an increase in the allowance removed by each tooth, and, accordingly, an increase in the productivity of the operation of pulling cylindrical concave surfaces.

Claims

11 The invention relates to metalworking and can be used in the treatment of cylindrical concave surfaces by pulling. The purpose of the invention is to increase the processing performance by increasing the allowance taken by each tooth. Figure 1 shows a broach for machining cylindrical concave surfaces; figure 2 - section A-L in figure 1. The stretch includes a front guide 1, a rear guide 2 and a cutting part 3 made of sequentially arranged first teeth 4. including cutting blades 5 and chip grooves 6. Cutting blades 5 are formed by a rotating surface of radius K. with a center at a point ABOUT . Stretch grooves 6 are formed by a rotational surface with a radius along depressions r with center at point O, displaced from point O by the value of eccentricity e. The magnitude of the eccentricity e is calculated from the following math correlation 10 times 1 h from which ratio fiHlh lH) j. , :(: (Rlhl (RlH where R is the radius of the cutting tooth circumference; h is the minimum acceptable — by depth of the width of the groove; page H; length of the working part of the cutting blade in the plane passing through the center of the cutting blade and the surface flute; r - radius of the circle of the groove depressions page zhechnoy Such KOHCTpyKiHBFuie solution ggrot buckle with zkspentrichnym raspolozhenierrezhuschih zuGi.ev and flutes provides increased cross-sectional area of the dangerous transport of the depressions of the teeth, and therefore, increase the allowance, remove each tooth, and. correspondingly, noBi.iiiieime of productivity of the operation of pulling cylindrical concave surfaces. Formula of invention A broaching tool for processing cylindrical concave surfaces, including cutting teeth with chip flutes between them, the outer surface of which is described by a body of rotation, characterized in the forming flute grooves are located eccentrically with respect to the forming cutting teeth, the eccentricity value being calculated from the following ematicheskogo ratios: / c of u, e (RzH) j .r - (R-h) ii lhlUlHl "where R - radius of the circumference of the cutting blade; h - the minimum depth of the chip groove is acceptable by location; H is the length of the projection of the working part of the cutting blade in a plane passing through the center of the cutting blade and the surface of the chip groove; g - the radius of the circle of the cavities of the chip groove.