RU207834U9 - A DEVICE FOR SHORTENING THE BLADE OF THE STATOR CASE OF THE GT-750-6 HPT-750-6 IN A LATHE - Google Patents

Abstract

The utility model relates to technical devices for machining the blades of the turbine stator cage in a lathe and can be used to shorten them during routine maintenance to replace worn blades with new ones from the repair fund, in order to bring the geometric dimensions of the inner diameters of the cage in line with specified in the manufacturer's documentation for the production of a new unit. The technical result is an increase in the speed and quality of restoration work with the GT-750-6 turbine stator cage. turbine stator of GT-750-6 TVD.

Description

The utility model relates to technical devices for machining the blades of the turbine stator cage in a lathe and can be used to shorten them during routine maintenance to replace worn blades with new ones from the repair fund, in order to bring the geometric dimensions of the inner diameters of the cage in line with specified in the manufacturer's documentation for the release of a new unit.

The prior art method of shortening the working blades of a turbomachine by removing material from the top of the blade, using a belt grinding device, which includes an electric motor and a grinding belt driven by the engine (patent RU 2678162 "Method for shortening the working blades of a turbomachine and a belt grinding device "dated 29.09.2014). The technical problem solved by this utility model is the shortening of the rotor blades of a turbomachine. The specified method can be considered analogous to the technical solution claimed by the team of authors and indicated as a prototype. In the analogue design, the rotating abrasive belt of the device is brought to the machined rotor blades.

The disadvantages of the analogous device, the authors of the claimed design include the fact that the belt grinding device used here, due to the drive to the electric motor, has a rotational speed limitation on the abrasive working surface, which is comparable with a pneumatic face grinder, which directly affects the speed, quality and accuracy of machining. In addition, it is technically very problematic to use this device for carrying out restoration work with the stator cage due to the design arrangement of the blades and the bulkiness of the belt grinding device.

The technical result of the proposed device is to increase the speed and quality of restoration work with the holder of the stator turbine GT-750-6.

The technical result is solved due to the fact that in order to shorten the blades of the GT-750-6 TVD stator cage to the desired size, a pneumatic face grinder is used on the lathe, which makes it possible to give a higher angular velocity, compared with a belt grinding device, to an abrasive working surface - the head , which directly affects its ability to perform high-speed high-precision processing to bring the geometric dimensions of the inner diameters of the cage in accordance with those specified in the manufacturer's documentation for the release of a new unit.

The authors propose a useful model, which is a device for shortening the blades of the GT-750-6 turbine stator cage in a lathe, characterized in that it consists of a pneumatic face grinder with a rotating abrasive head, which is mounted in the tool holder of the lathe using a bracket and fed to tool holder slide inside the stator cage, with the possibility of increasing the feed depth due to the rod with a lock, and allows you to shorten the blades of both stages of the stator cage.

The essence of this utility model is illustrated by graphic materials (Fig. 1, Fig. 2 and Fig. 3). In FIG. 1 shows a diagram of a device for shortening the blades of the GT-750-6 turbine stator cage in a lathe:

1 - lathe tool holder

2 - tool holder sled

3 - pneumatic end grinder

4 - bracket

5 - abrasive head

6 - 1st stage of the cage with blades to be shortened

7 - 2nd stage of the cage with blades to be shortened

8 - rod

9 - latch

The working part of the fixture - a pneumatic face grinder 3 with an abrasive head 5 - is mounted in the tool holder of the lathe 1 using a bracket 4 and is brought to the 1st stage of the holder with blades to be shortened 6 on the slide of the tool holder 2. Rotating the holder in the spindle of the lathe, sequentially process each blade. When machining the 2nd row of blades - the 2nd stage of the cage with the blades to be shortened 7 - a rod 8 is used, it allows you to extend the abrasive head 5 to the desired length (depth).

In FIG. 2 shows a rod for extending the abrasive head of a pneumatic face grinder. The latch 9 is used for secure fastening of the bracket to the rod.

In FIG. 3 shows a bracket for attaching a pneumatic end grinder assembly with a bar. The bracket 4 is attached to the rod 8 with a latch 9.

The proposed device contributes to solving the problem of optimizing routine maintenance to restore the GT-750-6 stator clip, increasing labor productivity.

Claims (1)

A device for shortening the blades of the GT-750-6 turbine stator cage in a lathe, characterized in that it consists of a pneumatic face grinder with a rotating abrasive head, mounted in the tool holder of the lathe using a bracket and fed on the tool holder slide into the stator holder, with the possibility of increasing the feed depth due to the rod with a lock, and allows you to shorten the blades of both stages of the stator cage.

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