SU129106A1 - Turbojet blade polishing machine - Google Patents

Description

Vibrocontact polishing machines for blade processing, in which the workpiece oscillates with respect to the processing tool, are known.

A distinctive feature of the polishing machine for treating shooters who also perform an oscillating movement is the use of a pneumatic working chamber with a powder-like abrasive under pressure to ensure its contact with the workpiece simultaneously over its entire curvilinear surface. At the same time, coaxial pores are used to create pressure on the powdered abrasive: the rods are made each two-piston to act on the powdered abrasive, which is in the complement; each, topatki.

Such an embodiment of the proposed machine makes it possible to reject the polishing tool used in the known vibrocontact machines in the form of difficult to manufacture rubber lodgments covered with abrasive tape or polishing substance.

FIG. 1 shows a diagram of the operation of the machine in the process of polishing; in fig. 2 - recharge scheme of the pneumatic chamber of the machine.

A drive with a crank mechanism / communicates the oscillating movement of the polished blade 2 entering the pneumatic chamber with a powdered abrasive. This chamber consists of two identical halves, symmetrically located relative to the axis of the blade 2. Each of them has three closed additional chambers 3. 4 and .5. Pneumatic chamber 6 and kamera 7 v. Are common, and the first of them in the process of work is blocked by a polished trowel.

LI 129106

Neighboring chambers communicate 5 with each other apertures covered with flaps 8, 9, 10, 11 and 12. Chambers 4 and 5 are formed by three actuators, in which two double-stem rods 13 move.

In the initial polishing position, the stems of the rods 13 are removed from the blade 2, and the chamber 6 for: is filled with a powdered abrasive. With the supply of air to the channels 14, the pores begin to move to the blade 2, pressing (with a predetermined pressure) abrasive it to the surface (see the arrows in Fig. 1). At the same time, the abrasive, seeping through the slots 15 (at the inlet of the blade into the cylinder), is then sucked through the open valves 12 and (S chambers 3 into chambers 4 due to the vacuum in the latter.

Clamp 16 in the lower part of the cylinder serves to reduce the pressure in the zone immediately adjacent to the end surface of the tail section of the blade 2. This reduces the resistance of the abrasive in the zone to the movement of the blade in the outward movement. The abrasive seeping through this slit flows through the openings with the valves 10 open into the chamber 5. The slit 16 is made adjustable and can be used to "throttle the abrasive flow."

Thus, when the pistons of the rods 13 move in the direction K of the blade 2 in the polishing process, the last abrasive seeps from the pneumatic chamber 6 into the pre-polypropylene chamber 4.

Replacing the polishing chamber 6 for the next blade is produced as a result of the air entering the channels 17, the pistons tell the accelerated movement from the blade 2 to the ends of the chi. (See arrows in Fig. 2). In this case, a vacuum is created in chamber 6, and the abrasive from chambers 5 through the open cappings 11 seeps into the chamber 6, and the chambers 5 in turn replenish the abrasive meters that seep through the opened valves 9 from the chambers 4.

An electromagnetic grid / L can be installed to clean the abrasive grain from metal chips.

Prevention and Consideration

1. A polishing machine for processing blades of turbojet engines, in which the workpiece performs an oscillating movement, about the fact that a pneumatic working chamber with a powder abrasive under pressure is used to work the workpiece, in order to ensure its contact with the workpiece simultaneously across its entire curved surface.

2. The machine tool according to claim 1, characterized in that the coaxial piston rods each working with a reciprocating abrasive in the working chamber and receiving reciprocating motion are made double-crimped to act on the powdered abrasive in the additional chambers communicating with the working chamber With the purpose of automatic recharging with the last spent abrasive after polishing each blade.