KR101494770B1 - Bucket cover processing apparatus - Google Patents

Abstract

A bucket cover processing apparatus according to an embodiment of the present invention includes a fixed portion to which an object is fixed, a main shaft for rotating the fixed portion, and a tool bar for machining the object so as to have a first diameter and a second diameter , The tool holder comprises a first cutting tool fixed to a first position such that the object is machined to the first diameter and a second tool fixed to the second position so that the object is machined to the second diameter, And a second cutting tool.

Description

[0001] BUCKET COVER PROCESSING APPARATUS [0002]

One embodiment of the present invention relates to a machining apparatus capable of machining a cover covering an outer periphery of a bucket.

The turbine rotor is a core device that generates high-speed rotating electric power by using high-temperature high-pressure steam obtained from the combustion of raw materials, and is generally manufactured to have a large size and high precision as compared with a rotor device for an aircraft.

These turbine rotors are manufactured in large size, and must withstand high-speed rotation. They are resistant to high-pressure and high-temperature environments and are easy to disassemble and repair once installed. It is generally made of a titanium alloy.

Although the titanium alloy having excellent physical properties is used, the bucket which is radially coupled to the outer circumferential surface of the rotor shaft by a large size as the turbine rotor is manufactured is also made large, so that the centrifugal force due to the high- The bucket can be deformed during rotation of the rotor.

A bucket cover is provided to cover the bucket so as to reduce external influences. The bucket cover is required to have a precise contour because of its characteristics.

Therefore, a cutting tool of a bucket cover that can reduce the time required for machining while finishing more precisely can be considered.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bucket cover processing apparatus having a more improved structure than the conventional one and capable of increasing work efficiency.

In order to accomplish the above object, according to one aspect of the present invention, there is provided a bucket cover processing apparatus comprising a fixed portion to which an object is fixed, a main shaft for rotating the fixed portion, Wherein the tool bar is coupled to a first cutting tool and a second cutting tool, the first tool being fixed to a first position so that the object is machined to the first diameter, And a second cutting tool fixed in a second position to be machined to the second diameter.

According to an example of the present invention, the second cutting tool may be formed to be movable relative to the first cutting tool.

According to an example of the present invention, the first cutting tool and the second cutting tool have a first hole and a second hole communicating with each other, and are coupled through the first hole and the second hole, And a position adjuster coupled to a thread formed along an outer periphery of the screw groove formed in the inner periphery of the two holes to adjust the position of the second cutting tool with respect to the first cutting tool by rotation.

According to one example of the present invention, the apparatus may further include a guide rod extending through the second cutting tool from the first cutting tool and guiding the second cutting tool to move relative to the second position have.

The bucket cover machining apparatus according to at least one embodiment of the present invention configured as above can simultaneously cut the portions having different outer diameters to reduce the depth distribution of the cutting tool and the cutting resistance that the bucket can receive during machining, And it is possible to prevent rework loss due to dimensional changes after processing.

1 is a conceptual view of a machining apparatus according to an embodiment of the present invention;
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]
3 is a conceptual view of a tool stand according to an embodiment of the present invention;
Figure 4 is a side view of Figure 3;
Figure 5 is a plan view of Figure 3;
6 is a sectional view of Fig. 3;
7 and 8 are views showing a processing state of a workpiece using a tool bar according to an embodiment of the present invention.
9 is a schematic perspective view of a turbine rotor to which the present invention is applied;
Fig. 10 is an enlarged view of a portion A of Fig. 9; Fig.

Hereinafter, a bucket cover processing apparatus according to the present invention will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the present specification, the same or similar reference numerals are given to different embodiments in the same or similar configurations. As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

1 is a conceptual diagram of a machining apparatus according to an embodiment of the present invention.

A lathe which is one of the machine tools for machining the workpiece with the tool while the workpiece is rotated with the main shaft can be used. The present invention will be described as an example of a processing apparatus related to the present invention, but not limited thereto.

As shown in Fig. 1, the machining apparatus 1 is provided with a main shaft that rotates by receiving power from the electric motor, and a fixed portion (chuck) 2 for fixing the workpiece to the threaded portion of the main shaft. A main shaft 3 that rotates the main shaft 2, a bed 4, a carriage 5, a tailstock 6, and an accessory device.

The carriage 5 includes a feed handle 7, a saddle 8, a transverse feed table 9 fed to the feed handle 11, a double-sided tool table 10, And the tail stock 6 is constructed so as to support a work object having a long length by inserting a center or a drill or the like on the spindle or perform a drilling work or the like.

The machining apparatus 1 having the above-described configuration can perform various cutting operations by rotating the workpiece in a state where the workpiece is held in the fixed portion 2 and using the tool bar coupled to the tool coupling portion 10. [

In order to perform a centering operation or a hole drilling operation, the tailstock 6 is moved to the work position, the center drill is mounted on the tailstock 6, and then the lock lever of the tailstock 6 is fixed, After the central base drill work for finding the center, the hole can be machined by engaging the drill to the tail stock 6 as described above.

Further, in order to perform tapping, the tab can be coupled to the tailstock 6 as described above, and then threaded.

2 is a state view showing an example of processing of a workpiece using a conventional tool rest.

The machining apparatus according to an embodiment of the present invention relates to the assembly of a rotor of a turbine, and more particularly, to a device used when a bucket is assembled to a rotor and then a bucket cover is machined into a given shape.

That is, the cutting tool is fixed to a cutting device such as a lathe, and then the outer diameter of the bucket cover is machined.

The tool rest 300 of the present invention is used as one of the cutting tools for machining such a bucket cover. The shape of the bucket cover may form a curved surface or a stepped portion. As a result, the radius corresponding to the distance from one side of the curved surface to the center axis of the bucket cover can be formed differently at that position.

In this case, it is possible to improve the cutting conditions by reducing the depth distribution of the cutting tool and the cutting resistance that the bucket can receive during machining, and to prevent the rework loss due to dimensional changes after machining. 300) may be used.

As shown in FIG. 2, the cutting tool 510 has a cutting edge 515 formed thereon. In the case of using a tool bar having a single cutting tool 510, since the workpiece 400 has a plurality of diameters, a plurality of reprocessing is required to form a shape corresponding to each diameter. In the case of reprocessing, the working time is increased by the number of times of machining, and power loss due to machining occurs. The cutting resistance of the workpiece 400 changes the dimension of the workpiece surface, and it may be difficult to process the workpiece 400 into a desired shape.

Accordingly, a method for solving such a problem can be considered. Hereinafter, the tool rest 300 according to an embodiment of the present invention will be described with reference to the drawings.

3 is a conceptual view of a tool rest 300 according to an embodiment of the present invention, Fig. 4 is a side view of Fig. 3, Fig. 5 is a plan view of Fig. 3, and Fig. 6 is a sectional view of Fig.

The tool rest 300 according to an embodiment of the present invention is fixed to the tool engagement portion 10 (see Fig. 1).

The tool rest 300 includes a first cutting tool 320 and a second cutting tool 310 and a second cutting tool 310 is formed to be movable relative to the first cutting tool 320.

The first cutting tool 320 is fixed to the first position such that the outer circumference of the bucket cover 400, which is the workpiece 400, has a first diameter. The second cutting tool 310 is fixed at a second position relative to the first cutting tool 320 such that the outer periphery of the bucket cover 400 has a second diameter. That is, the second cutting tool 310 is formed to have a processing depth different from the processing depth of the first cutting tool 320.

The first cutting tool 320 and the second cutting tool 310 have cutting edges 315 and 325, respectively.

Thus, the outer circumference of the bucket cover 400 can be machined using the first cutting tool 320 and the second cutting tool 310. [

The first cutting tool 320 and the second cutting tool 310 may have a first hole and a second hole communicating with each other so that the second cutting tool 310 can move relative to the first cutting tool 320. [ Two holes may be respectively formed.

A screw groove is formed in the inner circumference of the second hole, and a position adjusting portion 330 in which a screw thread is formed on the outer circumference can be coupled to the screw groove.

Alternatively, as shown in FIG. 6, only the second cutting tool 310 may have a hole 311 formed therein. One end of the position adjusting part 330 is fixed to the first cutting tool 320. When the position adjusting part 330 is rotated, the second cutting tool 310 is moved up and down along a thread groove or a thread formed in the hole Can be moved.

As shown in the drawing, the position adjusting part 330 may be formed in the shape of a screw that forms a thread on the outer periphery. When the user rotates the head part of the position adjusting part 330, the second cutting tool 310 moves up and down.

The first cutting tool 320 includes a guide rod 322 extending through the second cutting tool 310. The second cutting tool 310 has a hole through which the guide rod 322 passes.

Therefore, the guide rod 322 can guide the second cutting tool 310 in the vertical direction.

The first cutting tool 320 and the second cutting tool 320 are connected to each other to fix the first cutting tool 320 and the second cutting tool 310 in a state in which the first cutting tool 320 and the second cutting tool 310 are relatively moved, And may be formed on the side surface of the tool 310, respectively. The position of the second cutting tool 310 relative to the first cutting tool 320 is fixed when the pin 323 is inserted while the holes 321 and 312 are in a constant position.

FIGS. 7 and 8 are views showing the machining state of the workpiece 400 using the tool rest 300 according to an embodiment of the present invention.

The positions of the first cutting tool 320 and the second cutting tool 310 are fixed and the tool rest 300 is moved so that the first and second cutting tools 320, The cover 400 can be cut.

By simultaneously cutting the portions having different outer diameters of the bucket cover by using the first and second cutting tools 320 and 310, cutting conditions can be improved by reducing the depth distribution of the cutting tool and the cutting resistance that the bucket can receive during processing And it is possible to prevent rework loss due to dimensional changes after processing.

Fig. 9 is a schematic perspective view of a turbine rotor to which the present invention is applied, and Fig. 10 is an enlarged view of a portion A of Fig.

As shown in FIG. 9, the rotor 100 includes a rotor shaft 110 and a plurality of buckets 101 radially assembled on the outer circumferential surface thereof. The bucket 101 forms a compressor at the front end of the rotor shaft and a turbine at the rear end thereof. The rotor shaft 110 is fixed to the dedicated jig 200 at both ends and can be rotated by the rotating means 210. [

The compressor and the turbine of the rotor 100 have a multi-stage structure composed of a plurality of stages 120, and the size of the bucket 101 provided in each stage 120 is different.

The bucket cover 102 is coupled to the outer side surface of the bucket 101 assembled to the rotor shaft 110 so as to be coupled with neighboring buckets. The bucket cover 102 has an arc-shaped band shape that is coupled to the outer surface of the bucket 101 for each stage 120.

At this time, the bucket cover 102 is coupled to a group of neighboring buckets 101, and a space is formed between the opposite ends of the adjacent bucket covers 102. This is to allow the thermal expansion of the bucket 101 and the bucket cover 102 to be accommodated while narrowing the gap between the bucket covers 102 when the bucket is thermally expanded by the action of the rotor due to the high temperature steam.

The number of buckets forming a group of buckets bound to one bucket cover may vary depending on the size of the bucket according to the diameter of the stage and the degree of thermal deformation caused by the temperature condition depending on the rotor operating conditions.

Fig. 10 shows an outer side portion of the bucket and a bucket cover coupled thereto.

A rivet protrusion 111 made of the same material as that of the bucket 101 protrudes from the center of the outer side surface 111 of the bucket 101. The rivet hole 111 121 are formed so that the bucket 101 and the bucket cover 102 are engaged with each other by riveting. At this time, the number and shape of the rivet projections provided in the bucket may vary depending on design conditions.

It should be noted that the bucket cover processing apparatus described above is not limited to the configuration and method of the embodiments described above, but the embodiments may be modified so that all or a part of each embodiment Or may be selectively combined.

Claims (4)

A fixture to which the object is fixed;
A main shaft for rotating the fixing unit; And
And a tool rest for machining the object so as to have a first diameter and a second diameter,
The tool holder,
A first cutting tool fixed in a first position such that the object is machined to the first diameter; And
A second cutting tool coupled to the first cutting tool and secured in a second position such that the object is machined to the second diameter,
Wherein the second cutting tool is formed to be movable relative to the first cutting tool,
Wherein the first cutting tool and the second cutting tool have a first hole and a second hole communicating with each other,
And a position adjusting unit coupled to the first hole and the second hole to adjust a position of the second cutting tool with respect to the first cutting tool by rotation,
Wherein a screw groove is formed in an inner periphery of the second hole and a thread is formed on an outer periphery of the position adjusting portion so as to engage with an inner circumferential screw groove of the second hole. delete delete The method according to claim 1,
Further comprising a guide rod extending through the second cutting tool from the first cutting tool and guiding the second cutting tool to move to the second position.

Images