SU841823A1

SU841823A1 - Head for swirl cutting of thread

Info

Publication number: SU841823A1
Application number: SU792804381A
Authority: SU
Inventors: Степан Григорьевич Нагорняк; Петр Дмитриевич Кривый
Original assignee: Nagornyak Stepan G; Krivyj Petr D
Priority date: 1979-08-03
Filing date: 1979-08-03
Publication date: 1981-06-30

Description

(54) ГОЛОВКА ДЛЯ ВИХРЕВОГО НАРЕЗАНИЯ РЕЗЬБЫ(54) HEAD FOR VORTEX THREAD CUTTING

Изобретение относитс к станкостроению .FIELD: machine tool industry.

Известна головка дл вихревого нарезани резьбы, содержаща корпус, установленную в корпусе с возможностью вращени от привода полую оправку и режущие элементы fl The known head for vortex threading, comprising a housing, a hollow mandrel rotatably mounted in the housing, and a cutting member fl

Недостатком известной конструкции вл етс сравнительно низка долговечность режущих элементов.A disadvantage of the known construction is the relatively low durability of the cutting elements.

Цель изобретени - повышение долговечности и демпфирующих свойств ; головки.The purpose of the invention is to increase the durability and damping properties; heads.

Дл достижени поставленнойцели на торце полой оправки по окружности закреплены пальцы, а головка снабжена серьгами, на которых, установлены режущие элементы и по окружности которых выполнены прерывистые сквозные пазы, сопр женные с пальцами , и установленным на пальцах кольцом , предназначенным дл фиксации серег в осевом направлении, причем серьги установлены с возможностью смещени относительно пальцев в направлении , противоположном направлению рабочего вращени .оправки, а в одном из пазов каждой серьги закреплен упругий элемент с промежуточнымTo achieve the goal, the fingers are fixed on the end of the hollow mandrel circumferentially, and the head is equipped with earrings, on which cutting elements are installed and around which intermittent through-grooves are used, which are attached to the fingers, and a ring mounted on the fingers, to fix the earrings in the axial direction The earrings are mounted with the possibility of displacement relative to the fingers in the direction opposite to the direction of the working rotation of the correction, and in one of the grooves of each earring there is an elastic element ie with intermediate

сухариком, контактирующим с пальцем .rusk in contact with the finger.

С целью повышени демпфирующих свойств на поверхности паза, в котором закреплен упругий элемент, выполнена выемка.In order to increase the damping properties on the surface of the groove in which the elastic element is fixed, a notch has been made.

На фиг.1 показана предлагаема головка дл вихревого нарезани резьбы , частичный продольный разрез; Fig. 1 shows the inventive head for vortex tapping, a partial longitudinal section;

0 на фиг.2 - сечение А-А на фиг.1.0 in FIG. 2 is a section A-A in FIG.

Головка состоит из привода (не показан), шкив которого соединен ремн ми 1 с шкивом 2 вращательно-подвижной полой оправки 3, установлен5 ной в подшипниках 4 корпуса 5, соединенного с суппортом токарного станка (не показан). В торце полой оправки 3 запрессованы жестк 1е пальцы б, с которыми сопр гаютс серьги 7. 0 Свободные торцы серег зафиксированы в осевом направлении охватывающим кольцом 8, закрепленным на свобод . ных концах пальцев б посредством корончатых гаек (цифрой: не обозначены) . The head consists of an actuator (not shown), the pulley of which is connected by belts 1 to the pulley 2 of rotationally movable hollow mandrel 3, mounted5 in bearings 4 of housing 5 connected to a lathe support (not shown). At the end of the hollow mandrel 3, rigid fingers 1b are pressed in, with which the earrings 7 mate. 0 The free ends of the earrings are fixed axially with a female ring 8 fixed to the freedoms. the ends of the fingers b by means of crown nuts (numeral: not indicated).

5 Кроме того, по одной и той же окружности в торец оправки 3 запрессованы поводковые пальвда 9. с пальцами 6 и 9 сопр жены ;прерывистые сквозные пазы 10, расположенные по окружности 5 In addition, along the same circumference at the end of the mandrel 3, the lead palvda 9 are pressed in with the fingers 6 and 9, the intermittent through grooves 10 located along the circumference

Claims

0 of the same radius as the fingers in the mandrel. The earrings 7 are mounted on the fingers with the possibility of circular displacement relative to the fingers of the mandrel in the direction opposite to the working rotation, and in one of the grooves (or in all the grooves) elastic elements 11 (for example, rubber) are mounted, contacting fingers 9 through intermediate crunches 12 In order to increase the damping properties in the groove adjacent to the elastic element, a recess 13 is formed, forming in the initial position a free space between the surfaces of the groove and the elastic element. The operation of the vortex head for thread cutting is as follows .-- ---- - Before its beginning, the head is adjusted, for which the axis of the mandrel 3 is arranged eccentrically relative to the axis of the workpiece 14 and the thread profile is turned to the angle of elevation. The magnitude of the exDentrist theta depends on the depth of the profile section and, as a rule, is equal to its half. Usually, for the threads of large steps (modules), several incisors are used which mix the corresponding depth in the profile depth and in the step. . When the engine is turned on, the rotate is transmitted by belts 1 to the pulley 2 and to the bar 3. At the same time, the body 4 together with the turning lathe. The machine moves longitudinally with a predetermined feed. Such an arrangement of the head in one turn leads to the contact of the tool with the workpiece in a certain area and a crescent-shaped groove is cut through one cutter on the part 14. Since the speed of rotation of a head is hundreds of times faster than the speed of rotation of the part, then, if there are specified movements (rotational and translational) per revolution of the part, one cutter cuts through one turn of the cut thread, which is a combination of a multitude of sickle-shaped cannons. As a result, the cutters periodically contact many times with part 14, and such a transience of the process leads to significant shock loads, vibrations and a decrease in the wear of the tool and as a surface to be treated. Gyrskol in the proposed, constructive transfer of the circumferential cutting force at the time of insertion of the tool 3 is carried out by relative circular displacement of the earrings 7 relative to the hollow mandrel 3, which leads to compression of the elastic element 11, therefore, the cutting process occurs smoothly and the kinematic impact energy passes into the potential energy of compression of the elastic element. In connection with the fact that the cross-sectional area of the metal being cut, the metal layer is variable, the damping takes place not only during the cutting-in period, but also in the established cutting process. After the cutter has come out of contact with the workpiece, the element has been deformed before. 11 goes into its original state, returning the earring to its original position. When the same cutter approaches the contact with the part (the process described above is repeated. Claims of invention. 1. A swivel bastard with a housing installed in the housing with a possible hollow mandrel and cutting elements, about 20 In order to increase durability, at the end of the hollow mandrel there are fingers around the circumference of the hollow mandrel, and the head is equipped with earrings, on which cutting elements are installed and around which circumferential through grooves are made. and a ring mounted on the fingers for fixing the earrings in the axial direction, the earrings being set with the possibility of displacement relative to the fingers in the direction opposite to the direction of the working rotation of the mandrel, and in one of the slots of each earring there is an elastic element fixed to the gap. finger cracker in contact with the finger. 2. The head according to claim 1, so that, in order to improve the durability (properties), a recess is made on the surface of the groove in which the elastic element is fixed. . Sources of information taken into account during the examination 1. Melnikov N. f. and others. Mechanical Engineering. M., Mechanical Engineering, 1965, p.115, Fig.81.