SU986643A2

SU986643A2 - Trepanning drill

Info

Publication number: SU986643A2
Application number: SU813293333A
Authority: SU
Inventors: Дмитрий Дмитриевич Медведев; Леонид Михайлович Натапов; Михаил Дмитриевич Медведев
Original assignee: Брянский Ордена "Знак Почета" Институт Транспортного Машиностроения
Priority date: 1981-05-18
Filing date: 1981-05-18
Publication date: 1983-01-07

Description

Изобретение относитс к области обработки металлов резанием, и может быть использовано при обработке глухих отверстий кольцевыми сверламиThe invention relates to the field of metal cutting, and can be used in the processing of blind holes with circular drills.

Из основиого изобретени по авт. св. 848180 известно кольцевое сверло, в корпусе которого упруго установлен свободно вращающийс ролик , который выполнен с шириной, превышающей ширину вырезаемого кольца так, что одна его коническа поверхность взаимодействует с поверхностью удал емого стержн , а друга - с кромкой просверленного отверсти .Out of the main invention auth. St. 848180 a circular drill is known, in the case of which a freely rotating roller is elastically mounted, which is made with a width exceeding the width of the cut-out ring so that its one conical surface interacts with the surface of the rod being removed, and the other with the edge of the drilled hole.

Известный инструмент обеспечивает совмещение операции сверлени и удалени стержн даже при обработке глухих отверстий достаточно большого диаметра Cl J.The known tool provides a combination of the operation of drilling and removing the rod even when processing blind holes of a sufficiently large diameter Cl J.

Недостатком этого сверла вл етс то, что конические рабочие поверхности ролика контактируют с кромками отверсти и стержн , лежащими на разных диаметрах, что приводит к нарушению правильного обкатывани в точках контакта (по влению проскальзывани ) и как следствие, к порче рабочих поверхностей ролика и потере сверлом работоспособности.The disadvantage of this drill is that the tapered roller roller surfaces come in contact with the edges of the hole and the rod, which lie on different diameters, which leads to disruption of the proper rolling at the points of contact (slippage) and, as a result, deterioration of the roller roller surfaces and loss by the drill performance.

Целью изобретени вл етс повышение работоспособности инструмента .The aim of the invention is to improve the performance of the tool.

Поставленна цель достигаетс тем, что диаметр поверхности ролика, контактирующей с кроМкой просверленного отверсти выполнен больше диаметра его поверхности, взаимодействующей с поверхностью удал емого стержн , а ось вращени ролика расположена под углом к оси сверла так, что точка их пересечени находитс на поперечной плоскости, проход щей через точки контакта ролика с заготовкой .The goal is achieved by the fact that the diameter of the surface of the roller in contact with the drill hole is larger than the diameter of its surface that interacts with the surface of the rod being removed, and the axis of rotation of the roller is angled to the axis of the drill so that their intersection point is on the transverse plane through the points of contact of the roller with the workpiece.

На чертеже изображено предлагаемое кольцевое сверло в разрезе.The drawing shows the proposed circular drill bit in the section.

Корпус 1 кольцевого сверла с закреплёнными в нем ножами 2 установлен в оправке 3 шпиндел станка. В корпусе 1 сверла на подвижной державке 4 установлен свободно вращающийс ролик 5, имеющий конические рабочую 6 и опорную 7 поверхности.The case 1 of the ring drill with knives 2 fixed in it is mounted in the mandrel 3 of the machine spindle. In the drill body 1, a freely rotating roller 5 is mounted on the movable holder 4, having a tapered working 6 and supporting 7 surfaces.

Подвижна державка 4 подпружинена относительно корпуса 1 в осевом на правлении с помощью тарельчатых пружин 8.The movable holder 4 is spring-loaded relative to the housing 1 in the axial direction with the help of cup springs 8.

Claims

The diameter of the supporting surface 7 of the 30 face 5 exceeds the diameter of its working 6 surface. The axis of rotation of the roller 5 is located at an angle to the axis of the drill so that the point of their intersection O is On the transverse alo layer, passing through the points c and t of contact of the roller with the workpiece 9. The tool works as follows. The rotary drill is informed about the rotation and feed movement in the directions indicated by the arrows. In the process of drilling the hole, the knives 2 drills are cut out in the workpiece 9, an annular pa left the core 10 inside the drill. After drilling to a depth somewhat smaller than required, roller 5 enters the contact with the workpiece 9. Its support surface 7 is with the edge of the drilled hole, and the rolling of roller 5 along both contact edges {at points a and b) is carried out clean (without sliding). Upon further movement of the drill down with the feed 5, the movable holder 4, moving relative to the housing 1, compresses the springs 8, creating the necessary lateral force of the roller 5 up to the depth of 10 .. After reaching the required drilling depth, the feed movement s of the tool is turned off, leaving only its rotation. The roller 5 bends the rod 10 under the action of the springs 8. In this case, the direction of the imbib of the rod 10 due to the rotation of the tool is constantly changing. The bending stresses arising in the body of the rod 10 have alternating symmetrical character. After a certain number of tool rotation cycles corresponding to a critical number of load cycles, the rod 10 at the base fails. The invention improves the tool performance by increasing the strength of the breaking rollers by three times. Claims No. 848180, characterized in that, in order to improve performance, the diameter of the surface of the roller in contact with the edge of the drilled hole is made larger than its diameter, interacting with the surface of the rod being removed, and the axis of rotation of the roller is angled to the axis of the drill so that their intersection point is on a transverse plane passing through the points of contact of the roller with the workpiece. Sources of information taken into account in the examination 1, USSR Copyright Certificate 848180, cl. B 23 B 51/04, 1979.