SU823086A1 - Band polishing machine arrangement for imparting vertical and horisontal vibrations to blade - Google Patents

Description

I

The invention relates to the technology of abrasive machining, mainly to grinding and polishing, and can be used in machines for polishing complex-shaped surfaces, for example, feather blades of gas turbine engines, airborne propellers of aircraft, propellers of ships and other parts.

A polishing machine for simultaneous double-sided processing of a blade of a gas turbine engine is known, comprising a bed, longitudinal calipers, grinding tapes with volumetric copiers, horizontal and vertical vibration mechanisms and a longitudinal caliper feeding mechanism. The vertical vibration mechanism contains a clamping device, a pull, a spherical hinge and a drive, and a horizontal vibration mechanism includes a pull, a drive shaft, a support hinge, a spherical hinge and a drive. The device for communicating vibrations is made so that the blade is fixed at one end, m. e. console 1.

However, the cantilever pattern of fixing the blade along the toolpath with respect to the part does not allow achieving constant, since the paths of the grains of the abrasive tools at different distances from the point of fixing the blade are different.

Consider the kinematic diagram of the mechanisms of horizontal and vertical vibration of a known machine, constituting the vibration drive of the blade, with the blade fixed in them.

The mechanism of the vertical vibration of the blade creates oscillations with an amplitude of A7. This amplitude value is maintained by the DL of all points of the blade.

The values of the amplitudes AX of the horizontal oscillations of each point of the blade blade vary along the length of the pen. It happens

for the following reason. The design of the horizontal vibration mechanism provides for adjustable clearances 5, which are determined by the presence of a cantilever fastening of the blade and are used for self-adjusting the part-tool system. During operation, volumetric copiers running around the blade clamp it along the “contact point. Let the resultant clamping force be applied at the point N. When the system is fed along the X axis, the system rotates in the hinge B relative to the point N until the gap b is selected. At the same time, the pen points are mixed by an amount. Z, determined from the ratio Z b-Dz. This value will decrease the amplitude of the transverse oscillations of each point of the blade, i.e., the actual value of the uncoupled points in the section -j is, AHZ A, where 5 is 1.5 mm; R5 100 mm. / For example, for a given amplitude .M with R, - 200 mm, A 2 mm, RJ 300 mm, AH 0.5 mm, RJ 330mm, AX O Thus, when processing the blade in section, remote from the axis rotation of the sietem on the SZO mm, at a given amplitude of Ax 5 mm, the relative displacement of the abrasive grain and blade in the X direction becomes zero. The specified trajectory of grain movement in the form of Lissajous figures degenerates into longitudinal risks. Such conditions reduce the quality of processing. When the console fastening blades. At certain pressures of copiers against bending moments arising in the system, an additional error in the trajectory of the movement of the grains may occur. In addition, when the blade is fixed in the cantilever during vibration treatment, significant alternating stresses occur in the prikomlevom area of the blade feather, which can reduce the fatigue strength of the blade or lead to destruction of the blade during processing. The purpose of the invention is to provide the same kinematic processing conditions in each zone of the blade feather surface, improving the accuracy and quality of processing. This goal is achieved by the fact that the device of the belt polishing machine for communicating vertical and horizontal vibrations to the blade is provided with an additional clamping device for the second end of the part connected to the bracket which is inserted into the structure and installed with the possibility of movement relative to the axis passing through the vertical traction path. vibration, and a fork placed into the grooves of the fork inserted into the design, and the horizontal surface of the mechanism of the mechanism are kinematically connected to the drive shaft; th oscillating movement, with respect to the longitudinal axis of horizontal vibration drive mechanism. The drawing shows a diagram of the mechanisms of horizontal and vertical vibration with a lap-head polishing machine fixed on them for simultaneous double-sided processing of a blade blade. On the machine tool, vertical vibration 1 and horizontal vibration 2 drives are installed. The blade 3 is fixed with two ends in clamping devices 4 and 5, installed independently of each other in the angular direction at the inner ends of coaxial trunks b and 7 of the bracket 8. Upper trunnion 6 is connected a spherical hinge 9 with a vertical vibration drive 1. The trunnions b and 7 are mounted in coaxial sleeves 10 mounted on the ends of the cantilever parts of the cramp 8, and are able to self-align in the angular direction. To eliminate the angular oscillations of the bracket 8 together with the blade 3, its bow is mounted in the groove of the fork 11 attached to the machine body. The outer ends of the trunnions 6 and 7 are mounted movably in the sleeves 12 horizontal t g 13, connected by means of two earrings 14 and levers 15 with the ends of the drive shaft 16, on the middle part of which is fixed the lever 17 connected by means of the earring 18 with the eccentric 19 of the horizontal vibration drive 2 The device works as follows. At the same time, the actuators of the veruikal vibration 1 and the horizontal vibration 2, connecting the blade-3 oscillating movements to the blade 3, turn on. A movement drive, copiers, and rotation about their axes are reported. and the blade is run-in with 3 grinding belts, shaped with volumetric copiers, and the polishing of the oscillating blade. The blade 3 during processing is self-adjusting with respect to the volume copiers together with the clamping devices 4 and 5 and the trunnions 6 and 7, which rotate in the sleeves 10 of the bracket 8 and the sleeves 12 tons of g 13. The bracket 8 remains fixed in the angular direction due to its fixation with respect to beds with a fork 1. A horizontal vibration is communicated to the blade through bushings 12 tons and 13, reciprocating through the link 14 of the arms 15 and the drive shaft 16, receiving movement through the lever 17 and drawing 18 from the eccentric 19 of the horizontal vibration drive 2. Due to such a mechanism of horizontal vibration and fixing the blades in it by the two ends, the same trajectories of motion of all points of the blades moving in parallel plane are achieved. The bracket unloads the blade from the loads arising from horizontal and vertical vibrations. The one-sided design of the bracket allows free access to the treatment area from the workplace.

Claims (1)

Claim The device of the tape polishing machine for the message of the blade of vertical and horizontal vibrations, consisting of a vertical vibration mechanism containing a clamping device, a rod, a spherical hinge and a drive, and a horizontal vibration mechanism containing a rod, a drive shaft, a reference hinge, a spherical hinge and a drive, characterized the fact that, in order to improve the quality of the surface by ensuring the same kinematic processing conditions in each area of the surface of the blade, the device is equipped with an additional clamp a mnogo device for the second end of the part, connected with the bracket inserted into the structure, mounted to move relative to the axis passing through the vertical vibration rod, and placed in the grooves of the fork inserted into the structure, and the horizontal vibration mechanism rods are kinematically connected to the drive shaft, installed with the possibility of oscillatory motion relative to the longitudinal axis from the drive of the horizontal vibration mechanism.