SU603567A1 - Method of belt-grinding of blade root portions - Google Patents

Description

I

The invention relates to the belt unit for the junction points of intersecting profile surfaces, mainly near the joints of gas turbine engine blades (GDT) .5

Methods are known for grinding complex-shaped surfaces of double curvature, for example, prikomlevyh sections of GDT blades, moving abrasive belts, in which the ribbon is pressed to a part with a counter- 0 stroke, the working surfaces of which are treated surfaces that are equidistant to the thickness of the ribbon surface width fl.15

This method provides high performance, but has low accuracy, since abrasive belts poorly fit difficult-shaped contact copiers with working surfaces of double curvature. 20

This disadvantage does not have a well-known method of grinding with a narrow belt, according to which the width of the tape is taken less than the width of the workpiece. The tape is said to be transverse to the plane of its rotation l 25

movement relative to the workpiece with a contact copier by tilting the axis (one-piece) or several cylindrical rollers, bending around the tape, to the plane of its rotation. In this case, a branch of the tape, coming down from the contact copier, is positioned parallel to or close to this position 2j.

Providing the tape with transverse movements by the inclination of the axes of rotation of the cylindrical rollers does not guarantee stable transverse movements of the tape, therefore, due to the uncertainty of the tape position on the cylindrical roller during the tilting of its axis of rotation, it is not possible to perform a kinematic connection with the belt moving or pressing force. to the tape, which reduces the resistance of tapes.

Claims (2)

The purpose of the proposal is to increase the resistance of abrasive belts. For this, according to the proposed method, one of the tapes is positioned predominantly in a plane parallel to the shelf of the blade of the blade to be processed, while the planes of motion of the tape indicate reciprocating movements around the axis perpendicular to the first mentioned plane. The axis of rotation of the plane of motion of the ribbon is located in the center of the circle described around the processed profile of a feather in the joke section of the blade. When grinding using the described method, without any significant deformations, the ribbons are conveyed by cross-linking along the Konapaivi crcfire & contact ,. which increases the durability of the abrasive belts and permits an increase in the pressing force of the dopate to the copier, which will increase the processing performance. FIG. 1 and a device for rotating the belt for p6 using the described method, FIG. 2 section A-A in FIG. one. . Narrow abrasive tape 1, bending the contact copier 2, raising it to the blade to be processed 3, rollers 4, 5 and. drive pulley b is reported to rotate (in the direction of arrow V) with the grinding speed in the direction from the feather to the blade shelf, as well as transverse movements (along CTpeJtkam Sj,). The branch of the tape 1, descending from the contact copier 2, is placed in a plane, paral. processing the poke of the blade blade 3, and its end leaving the copier, po. face 4 is swept over the corner ci.cL of a circle of radius 1, the Ontra O of which coincides (lies on the same t1Nyi) with the center O 01 of the FULLNESS of the rada p, sisannoy around the processed profile of the pro- “A line is located on it, on which are the centers of the circles with a frame of f and, K. At the same time, the section of the tape, which goes around the contact copier, makes a movement (along the arrows S). The branch of the tape 1, descending from the contact copier 2, does not necessarily have to be precisely located in the plane, coinciding with the blade blade: deviation is allowed at a small angle, preferably not more than 10. The branch of the ribbon that runs over the copgf does not necessarily have to be placed in the no-ki plane; For it, the angle B of the deviation from the flat shelf of the blade blade can be made. According to the proposed method, the axis O of the shaft 7, with which the roller 4 moving the tape is connected, passes through the center O of the circle of radius p described by the pro4) or blade of the blade in its cross section perpendicular to the axis O of the shaft 7. Moving the tape rollers 4 and 5 are connected to the shaft 7 by means of brackets 8 and 9, mounted on a plate 10 mounted on the shaft / 7. The drive pinch 6 is mounted on the core 11, the axis of which is fixed on the shaft 7 and simultaneously with the tension device. Ш1ШВ 6 can be installed on the frame. Then the roller 5 is made tensioned, for which the bracket 9 on the plate 10 is mounted pivotally (not shown). When the device is in operation, a special mechanism is pumping the shaft 7 around the axis. Together with the shaft, the plate 1O and the rollers 4 and 5, which move the tape sections, the envelope roller 4, rotate along the arc of a circle of radius, the center O of which coincides with the center O of the approximating, processing the profile of a feather in the round cross-section of the shaft. The proposed method increases the stability of the abrasive belts several times (depending on their umpHWji, the shape of the blades or their sizes, etc.). Claim 1. A belt polishing method for prikomlevyh areas of the blades, in which the moving belt reported return transverse movement along the contact contour pressing to the blade, the working surface of which is equidio- tantny. on the thickness of the processing line {th surface of the blade, which is so that, in order to increase the resistance of the tape, one of the branches of the tape is placed mainly in a plane parallel to the butt of the blade of the blade to be processed, and the plane of the tape’s back is rotated back around the axis : the first mentioned plane. 2. The method according to claim 1 and 2 of t and ft with the fact that the axis of rotation of the plane of motion of the belt is located in the center of the circle described around the processed profile of the pen in the round cross-section, when processing the surface of the blade from the side of the pen. Sources of information taken into account in the examination: 1. Author's certificate number 287540, p. B 24 V 1/00, 1968. 2. Migunov V.M. et al. Belt-grinding machine for processing near-blade chastkov blades, Machine tools and tools 4, 1974, p. 12. CX Fi & .2