RU1541945C

RU1541945C - Method and machine for band grinding propeller blade

Info

Publication number: RU1541945C
Authority: RU
Inventors: ев В.Е. Сал; А.А. Воронин
Original assignee: НИИ технологии и организации производства двигателей
Priority date: 1987-12-03
Filing date: 1987-12-03
Publication date: 1993-12-30

Abstract

Изобретение относитс к области абразивной обработки маложестких длинномерных деталей типа лопастей воздушных винтов. Цель изобретени - повышение точности обработки. Способ ленточного шлифовани заключаетс в том. что лопасть закрепл ют жестко со стороны прикомлевой части, а свободному ее концу дэют свободу перемещени во всех направлени х, кроме нормального хорде пера, ограничива тем самым деформацию под воздействием остаточных напр жений в направлении наименьшей жесткости. При этом на границе , по которой величина дефформации превышает допуск, режим обработки измен ют с обработки по копиру на беско ирный. Станок дл осуществлени данного способа включает приспособлени дл зажима обрабатываемой лопасти - со стороны прикомлевой части жестко, а со стороны второго ее конца с ограничением перемещени только в направлении нормальном хорде пера, дл чего данное приспособление выполнено в форме Г-образных губок, с помощь которых зажимаетс лопасть и на поверхности которых установлены вращающиес ролики Само приспособление при этом устанавливаетс в каретку с возможностью вращени и перемещени в направлении оси лопатки . 2 ел ф-пы.4илFIELD OF THE INVENTION This invention relates to the field of abrasive machining of non-rigid long parts such as propeller blades. The purpose of the invention is to increase the accuracy of processing. The belt grinding method is as follows. that the blade is fixed rigidly from the side of the adjacent part, and its free end is given freedom of movement in all directions except the normal chord of the pen, thereby limiting deformation under the influence of residual stresses in the direction of least rigidity. At the same time, at the boundary at which the defor mation value exceeds the tolerance, the processing mode is changed from copy processing to infinite. The machine for implementing this method includes devices for clamping the blade to be machined — on the side of the adjacent part, rigidly, and on the side of its second end with restriction of movement only in the direction of the normal chord of the pen, for which this device is made in the form of L-shaped jaws, with the help of which it is clamped the blade and on the surface of which rotating rollers are mounted The device itself is mounted in the carriage with the possibility of rotation and movement in the direction of the axis of the blade. 2 eat f-py. 4il

Description

Изобретение относитс к области абразивной обработки маложестких длинномерных деталей и может быть использовано при финишной обработке лопастей воздушных винтов, имеющих переменную жесткость по длине пера и подвергающихс короблению в процессе шлифовани .The invention relates to the field of abrasive processing of small, hard, long parts and can be used in the finishing of propeller blades having variable stiffness along the length of the pen and warping during grinding.

Цель изобретени - повышение точности обработки.The purpose of the invention is to increase the accuracy of processing.

Способ шлифовани лопасти воздушного винта и станок дл его осуществлени по сн етс чертежами. На фиг. 1 изображен вид станка спереди; на фиг. 2 - сечение А-А на.фиг, 1; на фиг. 3 - узел креплени заготовки со стороны свободного ее конца (вид Б на фиг. 1); на фиг. 4 - изображен вид В на фиг. 3.The method of grinding the propeller blade and the machine for its implementation are illustrated in the drawings. In FIG. 1 shows a front view of the machine; in FIG. 2 - section AA on.Fig, 1; in FIG. 3 - the attachment unit of the workpiece from the side of its free end (view B in Fig. 1); in FIG. 4 is a view B of FIG. 3.

Станок выполнен в виде основани 1, по которому возвратно-поступательно перемещаетс каретка 2 с передним 3 и задним 4 узлами креплени заготовки. На основанииThe machine is made in the form of a base 1, along which the carriage 2 is reciprocally moved with the front 3 and rear 4 fasteners of the workpiece. Based

1установлены шлифовальные головки 5 с абразивными инструментами 6, 7 (контактные ролики, поджимающие абразивную ленту) и контактными 8. 9 роликами. Ролики1 mounted grinding heads 5 with abrasive tools 6, 7 (contact rollers pressing abrasive tape) and contact 8. 9 rollers. Rollers

8 и 9 и инструменты б и 7 св заны балками 10, установленными на шарнирных параллелограммах 1, наход щихс под воздействием пневмоцилиндров 12 и 13. Колирные ролики 8 и 9 установлены на штоках пневмоцилиндров 14 и 15. Обрабатываема лопасть 16 и копир 17 закреплены на каретке8 and 9 and tools b and 7 are connected by beams 10 mounted on hinged parallelograms 1, which are under the influence of pneumatic cylinders 12 and 13. The collier rollers 8 and 9 are mounted on the rods of pneumatic cylinders 14 and 15. The machined blade 16 and the copier 17 are mounted on the carriage

2с двух сторон. Узел креплени заготовки 4 содержит Г-образную губку 18, шарнирно св занную с губкой 19 и установленную через хвостовик 20 на каретке 2 с возможностью вращени вокруг оси хвостовика и осевого перемещени . На стенках пр мо- угольного паза, образованного губками 18 и 19, установлены цилиндрические ролики 21 с ос ми, параллельными оси хвостовика. Дл сближени губок 18 и 19 при закреплении свободного конца лопасги 16 используетс винт 22. Узел креплени заготовки 4 захватывает губки 18 и 19, деформированный 23 конец лопасти 16.2s on both sides. The workpiece attachment assembly 4 comprises an L-shaped jaw 18 pivotally connected to the jaw 19 and mounted through the shank 20 on the carriage 2 with the possibility of rotation around the axis of the shank and axial movement. On the walls of the rectangular groove formed by the jaws 18 and 19, cylindrical rollers 21 are installed with axes parallel to the axis of the shank. To bring the jaws 18 and 19 closer together, a screw 22 is used to secure the free end of the tongue-and-groove 16. The workpiece attachment unit 4 grips the jaws 18 and 19, the deformed 23 end of the blade 16.

Способ шлифовани лопасти воздушного винта заключаетс в том, что заготовкуThe method of grinding the propeller blade is that the workpiece

Claims

SUMMARY OF THE INVENTION 1. Method of belt grinding a blade of a propeller. in which the abrasive tools are brought into contact with the blade from two sides and grinding is carried out using a copier, while the end of the blade opposite the adjacent part is given freedom of movement, characterized in that, in order to increase the accuracy of processing, freedom

they are fixed from the side not deformable: the ganglion part is rigidly and the processing is carried out from both sides simultaneously on a copy. In this case, surface residual stresses occur in the blade being treated, leading to deformation of the blade. This deformation from the side of the free end of the blade may exceed the size tolerance, and the processing of this part of the blade

copy is not possible. Therefore, the free end of the blade gives freedom of movement caused by deformation due to residual stresses in all directions except the normal chord of the pen.

the direction of the greatest deformation is limited, and the blades are machined line by line along the axis of the blade, switching the copy processing mode to non-copier when the boundary between the undeformable nibble part and the deformed blade part passes,

The operation of the machine for grinding the blade consists in the fact that the carriage 2 together with the part 16 and the copier 17 performs a reciprocating movement relative to the grinding heads 5, on which the tools 6 and 7 and the copy rollers 8 and 9 are mounted with the possibility of movement in the vertical direction

discretely by the value of the line step. In this case, the machined blade 16 is fixed in the carriage 2 from the side of the adjacent part, rigidly, and the second end - in the tool 4, allowing the movement of this end of the blade under the influence of residual stresses in all / directions, except for the normal chord of the pen, for which this device rotates freely and moves along the axis

blades and includes a groove formed by rotating rollers 21, allowing the blades to roll along them in the direction of the chord of the pen and preventing movement in the direction normal to the chord

pen

(56) USSR Copyright Certificate Ms 854689, cl. B 24 V 21/00, 1981.

movements of the indicated end of the blade

limit in the direction perpendicular to the chord of the blade, while the part of the blade adjacent to this end is ground with a constant clamping force.

2. The machine for belt grinding of a propeller blade, made in the form of a base and placed on it by two instrumental knobs, a carriage and an attachment unit prikom h--: oh cha515419456

blades, characterized in that the supporting rollers with them are used for increasing the accuracy of machining, the jaws are mounted with a knife on one side, the machine is additionally equipped with a relative displacement unit with one of the fasteners mounted on the side, they are mounted on a fastener L - opposite to the attachment unit with the axial displacement and Г part of the blade’s upper part, and made in the carriage, de L-shaped jaws with installed

fe.3

G

FIG. 5