SU837795A1 - Belt-grinding machine for working blades - Google Patents

Description

I

The invention relates to the grinding of feathers or gibgles of gas turbine engine blades and can be used in belt grinders such as ZLSh-41, ZLSh-21, 3813D and others.

A blade grinding machine is known that includes blades for accelerated and working feed, a feed restriction stop and a quill with which the feed restriction finger is rigidly connected, and a contact copier with a grinding tape D around it.

The disadvantage of this machine is that the transition from the fast supply of the tape with a copier to the part to the working feed is carried out not at the time of their contact, but somewhat earlier, taking into account the dispersion of the tolerance during start-up, which reduces its productivity, since the speed the working feed is significantly less than the fast approaching speed and, with a premature reduction in the feed rate, part of the supply path is performed at a slow (working) feed rate.

The purpose of the invention is to increase the machining productivity by switching the quick feed to the working one when the tool touches the workpiece.

To achieve this goal, the feed restriction stop is installed with the possibility of constant contact with the stake of restricting the feed and movement from the accelerated or working feed mechanisms into the guides, rigidly connected to the housing, introduced into the machine.

FIG. Figure 1 shows schematically the kinematic diagram of the machine in the plane of rotation of the belt; in fig. 2 connection unit for overtaking clutch with fast feed and working feed drives.

Claims (1)

The blade to be machined 1 is fixed to the spindle 3 mounted on the bearings in the rolling mechanism 4 of the rolling mechanism with the help of the tool 2. At the end of the spindle, the lever 5 is rigidly fixed, the live freely rotating roller 6, which interacts with the cam 7, turns the spindle. The cradle 4 rotates about the axis O by a crankshaft 8 connected to a corresponding drive (not shown. Lever 5 pressed with roller 6 to the copier 7 of the spindle reversal is spring 9, one end of which is fixed in the cradle body and the other end on the spindle. The profiled contact copier 10, pressing the grinding belt 11 to the blade to be machined, is mounted on the cutting machine feed quill 12 for cutting. Pressing the quill pin in the cutting direction, i.e. moving in the guides of the housing 13, is carried out by force pneumatic Mocylinder 14. A supply restriction pin 15 is attached to the quill pin 12. It is in contact with the supply restriction stop 16. An emphasis 16 is kinematically connected to a feed mechanism drive, including electric motor 17, gearbox 1 sprocket 19, chain drive 20 and sprocket 21, which is an outer ring clutches 22 of overtaking mounted on a shaft 23 located in the software; EQUIPMENT supports 24. A shaft 23 of a bevel gear 25 is kinematically connected to a shaft 26 connected by a black gear 27 with a lead screw 28 interacting through a screw with an emphasis 16, having the ability to move in guides 29 parallel to the movement of the pin 12. The guide 29 is rigidly connected to the body of the quill. The distinctive feature of the machine is that the stop 16 of the feed restriction is installed with the possibility of constant contact with the finger of the feed restriction and movement from the accelerated or working mechanisms of the guides entered into the machine 29. The accelerated feed mechanism, i.e. fast supply of a tape with a contact copier to the blade to be machined, made in the form of a shaft 30 located coaxially with the shaft 23 in the bearing support 31. At one end of the shaft 30 there is a sleeve 32 attached to the body 34 rolling (rollers or balls) of the overtaking clutch 22, and the second end of the shaft 30 is connected to the drive of its rotation - the handwheel 35 (or the engine). The grinding rollers 11 support rollers 36, copier 7 reversing spindles, axis O swing the cradle of the rolling mechanism, housing 13 quills, drive 17-18, bearing supports 24, 31, etc. are mounted on the frame 36. Pulley 37 serves as an endless drive grinding belt in rotation, and to tension it. When the machine is operating, crank 8, rotating from its drive, tells cradle 4 to rotate around axis 0. At this, roller 6, pressing spring 9 to copier 7, informs Spindle 3 through lever 5 and, together with it, blade 1, the necessary formative movement running over the rotating tape 11 of the contact copier 10. A fast feed of the tape with a contact copier to the blade being processed is made by rotating the handwheel 35, the torque from which is transmitted through the lugs 33 of the sleeve 32, the rolling body 34, the overtaking coupling 22, the shaft 23, the conical 25 and the red heart 27 before Beginnings to the drive screw 28, which stops the stop 16 through the screw transmission in the guides 29 in the feed direction. By the stop 16 together with the quill 12 by the power cylinder 14, the feed restriction finger 15 is pressed. At the time of touching the ribbon blade rotation of the handwheel 35 is stopped. Further rotation of the shaft 23, i.e. The working feed of the quill is produced from the electric motor 17 through a gearbox 18, a chain drive and an overrunning clutch, which at this time is automatically wedged. I The moment of touching the blade with a quick manual feed, Gili is automatically determined by characteristic noise, the appearance of grinding sparks or the change in the electric current consumed by the electric motor rotating the Drive pulley 37. At the end of the treatment, pressure is applied to the lower cavity of the power cylinder 14, which removes the contact copier 10, and rotation of the handwheel 35 returns the stop 16 to its original position. At the same time, other mechanisms are stopped (belt rotation drive, rolling mechanism, working feed drive). The positive effect of using the proposed flock depends on the size of the allowance for the allowance of the blade to be machined and the allowance itself: the greater this tolerance and the smaller the allowance, the higher the effect achieved. Claims for blade processing, containing mechanisms for accelerated and working feed, feed stop and quill, to which the feed restriction finger and the contact copier 8 5 are beaten with a grinding tape, with which In order to improve processing performance by moving the fast feed to the worker when the part touches the tool, the stop of the feed restriction is installed with the possibility of constant contact with the finger of the Feed restriction and. audio or accelerated by mechanisms working in the feed introduced into the machine guide is rigidly connected to the quill housing. Sources of information taken into account during the examination 1. USSR author's certificate № 140703, cl. B 24 B 21/16, 17.11.60. ts SO Jv