JP2000317808A - Apparatus for polishing turbine blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for polishing turbine blades, which is capable of polishing a number of blades at the same time and polishing every portion of the blade regardless of their contour and size, and of carrying out polishing by the minimum number of abrasive stones with keeping the blades from contact with each other. SOLUTION: This apparatus has a vibrating tank 3, revolving frames 20 rotatably suspended from a beam which can ascend and descend above the vibrating tank 3, rotating frames 33 each supported by the revolving frame 20 and rotated by the rotation of the revolving frame 20, and having a blade fixing mechanism. The blades are fixed to the rotating frames 33, and then polished while being subjected to movement due to revolution and rotation of the rotating frames 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for polishing a turbine blade.

[0002]

2. Description of the Related Art Turbine blades (hereinafter referred to as blades) need to polish a fluid passage surface to a predetermined surface roughness in order to obtain a good fluid flow. However, since the blade has a complicated two- or three-dimensional curved surface shape, polishing is difficult.

Conventionally, the blade is polished manually by a power tool using a grinder, sandpaper, buff, or the like, or mechanically polished by a copying machine or NC machine using a grinder, sandpaper, a buff, or the like. Alternatively, it is mechanically polished with a vibration polisher or a barrel polisher using a polishing stone.

[0004] In such polishing, a method of manually polishing can cope with various shapes and sizes, but it is difficult to maintain the accuracy of the shape, and it requires a skilled operation.
Also, sharpening large blades was hard work, and was extremely inefficient economically.

[0005] In addition, mechanical polishing such as an NC machine can maintain polishing accuracy and does not cause heavy labor. However, it is difficult to cope with various shapes and sizes, and it is difficult to cope with fine parts such as corners. For this reason, a step was found at the joint between the surfaces, and the equipment was extremely expensive mechanically.

Further, in the polishing using a polishing stone, the polishing accuracy can be maintained and a small and lightweight blade can be efficiently polished. For example, as shown in FIG. Since the polishing is performed with the blade B, the blades come into contact with each other and a dent is formed on the blade surface. To prevent this dent, the number of blades in the barrel must be reduced, reducing efficiency. In addition, it is very difficult to protect a portion that is not required to be polished such as a blade root portion.

[0007]

As described above, any disadvantages have been pointed out in any of the conventional blade polishing methods. The present invention solves the disadvantages of the conventional type, in which a large number of blades of any shape and size can be simultaneously polished to the smallest detail, and the efficiency can be polished with the minimum necessary polishing stones. The purpose is to obtain a good polishing apparatus.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a vibration tank containing an elastically supported, vibration generator connected thereto, and a polishing stone which is liquefied by vibration, and a beam which can be raised and lowered above the vibration tank. A revolving frame suspended rotatably, and a revolving frame supported by the revolving frame, rotated by rotation of the revolving frame, and having a blade fixing mechanism, and fixing the blade to the revolving frame, Polishing is performed while giving the rotation of the rotation frame and the movement by the rotation.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a skeleton of a polishing apparatus according to the present invention, and FIG. 2 is a plan view taken along line XX of FIG. 1, showing an example having two vibration tanks. First, the vibration tank will be described. Reference numeral 1 denotes a base on which the polishing apparatus is installed, and reference numeral 2 denotes a main body frame erected on the base 1.

Reference numeral 3 denotes a vibration tank elastically supported on the base 1, and reference numeral 4 denotes a granular grinding stone which is put into the vibration tank 3 during polishing. Reference numeral 5 denotes a spring which is an elastic body.
Reference numeral 6 denotes an attached tank, which is housed in contact with the inner surface of the vibration tank 3. The attached tank 6 is pulled out, the spacer is bitten, and bolted to the vibration tank 3 to make the vibration tank deeper. The amount of the polishing stone 4 can be increased.

Reference numeral 7 denotes a vibration generator, which is mounted in contact with the two vibration tanks 3, 3 in this embodiment while being sandwiched between the two vibration tanks 3, 3. The vibration generator 7 includes a square box-shaped case 8, a bearing 9 fixed to the case 8, and an eccentric rotor 10 supported by the bearing 9. Reference numeral 11 denotes a weight for amplitude adjustment which is attached to the eccentric rotor 10 so as to be overlapped with the eccentric rotor 10.

The rotation shaft of the eccentric rotor 10 is connected to a separately provided motor 12. Therefore, when the motor 12 is driven, the eccentric rotor 10 is eccentrically rotated, and the generated vibration is transmitted to the vibration tank 3, and the vibration tank 3 vibrates. Note that the motor 12 is a variable speed motor and can adjust the rotation speed of the eccentric rotor 10.

Next, the lifting beam will be described. 13
Is a lifting beam, above the vibration tank 3,
It is hung by a jack 14 installed on the main body frame 2 and can be moved up and down by the operation of the jack 14. Reference numeral 15 denotes a screw of the jack 14, reference numeral 16 denotes a motor, and reference numeral 17 denotes a connection shaft for adjusting the phases of the left and right jacks 14 connected to the motor shaft. Both ends of the lifting beam 13 are guided by the columns of the main body frame 2.

Reference numeral 18 denotes a limit switch for setting the lower limit of the elevating beam 13 attached to the column of the main body frame 2. Reference numeral 19 denotes a limit switch for setting the upper limit of the elevating beam 13 similarly attached to the column of the main body frame 2. It is. The contact positions between the limit switches 18 and 19 and the lifting beam 13 can be adjusted, and the lifting range of the lifting beam 13 can be changed according to the height of the polishing stone 4 in the vibration tank 3 and the size of the blade. can do.

Next, the revolving device will be described. 20
Is a disk-shaped revolving frame having a shaft portion in the center,
A fixed shaft 21 attached to the lifting beam 13 is rotatably supported around the fixed shaft via a bearing 22.
Reference numeral 23 denotes a pulley fitted and fixed to the shaft portion of the revolving frame 20, reference numeral 24 denotes a driving pulley supported by the lifting beam 13, and reference numeral 25 denotes a timing belt wound around the driving pulley 24 and the pulley 23. .

Reference numeral 26 denotes a motor installed on the lifting beam 13, and its rotation shaft is connected to a support shaft of the driving pulley 24. Therefore, by driving the motor 26, the driving pulley 24 is rotated, and the pulley 23 is rotated via the timing belt 25.
The revolving frame 20 integrated therewith is rotated around the axis of the fixed shaft 21. The motor 26 has a variable speed reducer.
The rotation of the drive pulley 24 can be shifted.

Next, the rotation device will be described. 27
Are bearing bosses radially fixed to the revolving frame 20, and six bearing bosses are arranged in this embodiment (FIG. 2). Reference numeral 28 denotes a rotation shaft that is supported by a bearing of a bearing boss 27 and is rotatably supported by the revolving frame 20 via a thrust collar 29.

Numeral 30 denotes a stationary gear fixed to a fixed shaft 21, 31 is rotatably supported by the revolving frame 20,
A planetary gear meshes with the stationary gear 30, and a rotation gear 32 fixed to the rotation shaft 28 and meshes with the planetary gear 31. A rotation frame 33 is suspended from the rotation shaft 28 via a coupling 34 and has a blade B fixing mechanism.

Therefore, when the revolution frame 20 rotates, the rotation shaft 28 revolves on an arc centered on the fixed shaft 21. Further, the rotation of the planetary gear 31 rotating on the stationary gear 30 by this rotation causes the rotation gear 32 to rotate, and the rotation shaft 28 rotates. That is, the rotation frame 33 suspended on the rotation shaft 28 revolves while rotating.

FIG. 3 shows a hanging portion of the rotation frame 33. The rotation frame 33 is formed with an engagement recess with the rotation shaft 28, and the frame of the rotation shaft 28 engages with the recess to suspend the rotation frame 33. The coupling 34 penetrating the rotation shaft 28 is screwed and integrated with the rotation frame 33 and rotates in the same manner.

Reference numeral 35 denotes a detent pin implanted on the rotation shaft 28. Reference numeral 36 denotes an engagement pin implanted on the upper surface of the coupling 34, which is engaged with the detent pin 35. ing. Accordingly, the rotation of the rotation shaft 28 is transmitted to the coupling 34 and the rotation frame 33 by the engagement of the engagement pin 36 with the rotation preventing pin 35, but when the rotation shaft 28 is stopped, the rotation frame 33 is manually moved to substantially one position. Can be turned around.

FIGS. 4 and 5 show the fixing mechanism of the blade B. FIG. Reference numeral 37 denotes a space formed in the longitudinal direction of the rotation frame 33 and having an open lower surface. Reference numeral 38 denotes a fixing bracket provided in the center of the back surface of the rotation frame 33 in the longitudinal direction. It extends to the lower surfaces of the cavities 37 and 37 and is fixed by screws. 39 is a fixing bracket 38
In response to the above, adjustment metal fittings provided on both sides of the back surface of the rotation frame 33 and in the longitudinal direction have a long hole, and are screwed to the back surface of the rotation frame 33 so that the movement can be adjusted.

Reference numeral 40 denotes a vertically movable metal fitting which can be moved up and down in the cavity 37. A large number of such metal fittings are arranged in the longitudinal direction of the rotation frame 33 over the entire width for fixing the blade B. The vertically moving bracket 40 is provided with a screw shaft 4 passed through the rotation frame 33.
1 and can be moved up and down along a detent guide formed on the rotation frame 33 by the rotation of the screw shaft 41.

Therefore, the blade B presses the blade root against the fixing bracket 38, fixes the blade against the corresponding side by pressing the adjusting bracket 39, and holds the head with the vertical moving bracket 40.
It is supported and fixed at three points. Since the blade root portion of the blade B is tree-shaped or T-shaped or has a different shape, it is effective to match the cross-sectional shapes of the fixing bracket 38 and the adjustment metal 39 to the shape of the blade root portion.

Reference numeral 42 denotes a pressing plate for preventing the blade B from jumping out of the longitudinal direction of the cavity 37. The pressing plate 42 is attached to the longitudinal side surface of the rotating frame 33 with a screw bolt, and presses the flange of the blade B. . Reference numeral 43 denotes a distance piece for the blade B to suppress the movement of the space 37 in the longitudinal direction. After the blade B is fixed, the distance piece 43 is inserted between the flange portions and screwed to the fixing bracket 38.

FIG. 6 is a schematic plan view showing an example in which four vibration tanks 3 are provided. In this state, a set of two vibration tanks 3 shown in FIG. 2 is arranged to face each other. In this case, the gantry 44 is rotatably attached to the elevating beam 13, and the revolving frame 20 is hung at four corners of the gantry 44. The gantry 44 has a turning race 45, and the pinion 4 is rotated by a motor provided on the lifting beam 13.
6, it is rotated 90 or 180 degrees.

The drive pulley 24 ′, which is pivotally supported at the center on the back side of the gantry 44, is a double pulley, and the timing belt 25 is wound around each set of the pulleys 23 mounted on the shaft of the revolving frame 20. Have been. In this case, the four revolving frames 20 can be made to correspond to different vibration tanks 3 by rotating the gantry 44.

FIG. 7 shows a modification of the attached tank. Reference numeral 6 'denotes an auxiliary tank having a shallow bottom. The auxiliary tank 6' can be fixed to the vibration tank 3 in place of the above-described auxiliary tank 6, and the capacity of the vibration tank can be reduced. Thus, the blade B having a small size can be polished with a small amount of abrasive stone, and wear due to contact between abrasive stones can be reduced. Although not shown, a stopper for discharging the polishing stone is provided at the bottom of the vibration tank 3 and the attached tank 6 '.

The configuration of the present invention is as described above, and the polishing procedure will be described next. First, the lifting beam 13 is placed at the upper limit position, and the blade B is fixed to each rotation frame 33 by a fixing mechanism. For example, in the case of the embodiment, six blades B can be fixed to each rotation frame 33, and since there are six sets of the rotation frames 33, 36 blades B can be fixed per vibration tank.

Next, the vibration generator 7 is operated to vibrate the vibration tank 3 filled with the polishing stone. By the vibration of the vibration tank 3, the polishing stone 4 is liquefied and fluidized as shown by the arrow in FIG. Then, the motor 26 is driven to rotate the revolving frame 20 via the driving pulley 24, the timing belt 25, and the pulley 23. This revolving frame 2
By the rotation of 0, the rotation frame 33 rotates through the planetary gear 31. That is, the rotation frame 33 performs two movements of revolving while rotating.

Then, the lifting beam 13 is lowered, and the fixed blade B is put into the fluidized bed of the grinding stone 4 and polished.
Since the blade B is polished in the vibration tank 3 while being subjected to two movements by the rotation and revolution of the rotation frame 33, the blade B is polished evenly to details. Then, the polishing speed increases due to the two movements. Further, the blades do not come into contact with each other while simultaneously polishing a large number of blades B.

The amplitude of the vibration tank 3 is adjusted in accordance with the amount of the grinding stones to be put in and out by putting the amplitude adjusting weight 11 in and out, and the rotation speed of the rotation frame 33 is changed by the control of the variable speed motor 26. By controlling the motor 12, the frequency and amplitude of the vibration generator are adjusted according to the type of the grinding stone.

When the polishing is completed, the lifting beam 13
Then, the motor 26 is stopped, the rotation of the rotation frame 33 is stopped, the variable speed motor 12 is stopped, and the vibration generator is stopped. Then, each blade B is removed from the rotation frame 33. At this time, since the rotation frame 33 has its engagement pin 36 engaged only with the rotation preventing pin 35 of the rotation shaft 28, the rotation frame 33 can be manually rotated by about one rotation, and the blade B can be removed by one rotation. Can be done from the side. This is the same when the blade B is mounted.

In the embodiment shown in FIG. 6, since the gantry 44 can be rotated to correspond to different vibration tanks 3,
By putting the coarse grinding stone and the finishing grinding stone into each of the two vibration tanks 3, when performing the rough grinding to the finish grinding, the blade B can be performed without removing the blade B from the rotation frame 33.

[0035]

According to the present invention, in a polishing apparatus using a polishing stone, the blade is polished in a vibration tank by giving two movements by the rotation of the rotation frame and the revolution in the vibration tank, so that the polishing accuracy can be maintained. Thus, the polishing can be efficiently performed in a short period of time, even to fine parts.

Further, since the blades are individually fixed and polished, the blades do not contact each other in the vibration tank while polishing a large number of blades at the same time, so that no dents occur on the blade surfaces. . Further, by providing the attached tank to the vibration tank, the amount of the grinding stone can be increased or decreased according to the size of the blade to be polished, and the wear of the grinding stone can be suppressed.

[Brief description of the drawings]

FIG. 1 is a front view showing a skeleton of a polishing apparatus of the present invention.

FIG. 2 is a plan view as seen from line XX of FIG. 1;

FIG. 3 is a diagram showing a hanging portion of the rotation frame.

FIG. 4 is a side view showing a fixing mechanism of the blade.

FIG. 5 is a bottom view as seen from line YY of FIG. 4;

FIG. 6 is a diagram showing an example in which four vibration tanks are provided.

FIG. 7 is a diagram showing a modification of the attached tank.

FIG. 8 is a schematic view showing an example of a polishing apparatus using a conventional polishing stone.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Baseboard 2 Main body frame 3 Vibration tank 4 Grinding stone 5 Spring 6, 6 'attached tank 7 Vibration generator 8 Case 9 Bearing 10 Eccentric rotor 11 Amplitude adjusting weight 12 Motor 13 Elevating beam 14 Jack 15 Screw 16 Motor 17 Connecting shaft 18, 19 Limit switch 20 Revolving frame 21 Fixed shaft 22 Bearing 23 Pulley 24, 24 'Drive pulley 25 Timing belt 26 Motor 27 Bearing boss 28 Self-rotating shaft 29 Thrust collar 30 Static gear 31 Planetary gear 32 Self-rotating gear 33 Self-rotating frame 34 Coupling 35 Detent pin 36 Engagement pin 37 Vacancy 38 Fixing bracket 39 Adjustment bracket 40 Vertical movement bracket 41 Screw shaft 42 Holding plate 43 Distance piece 44 Mount 45 Rotating race 46 Pinion

Claims (6)

[Claims] 1. A vibration tank which is elastically supported, has a vibration generator, contains a polishing stone, a lifting beam which can be raised and lowered above the vibration tank, and is rotatably suspended by the lifting beam. A revolving frame and a revolving frame rotatably hung on the revolving frame and having a blade fixing mechanism, each blade is fixed to the blade fixing mechanism, and polishing is performed while giving the blade a revolving motion of the revolving frame and a motion by the rotation. An apparatus for polishing a turbine blade. 2. A blade fixing mechanism comprising a fixed hardware, an adjustment hardware capable of adjusting a horizontal movement with respect to the fixed hardware, and a vertically movable metal fitting capable of moving up and down above the fixed hardware and the adjustment hardware. The polishing apparatus for a turbine blade according to claim 1, wherein: 3. The turbine blade according to claim 1, wherein the revolving frame is rotated by a motor provided on the lifting beam, and the revolving frame is rotated by rotation of the revolving frame using a planetary gear. Polishing equipment. 4. The apparatus for polishing a turbine blade according to claim 1, wherein the rotation frame is rotated by engagement of a rotation prevention pin implanted in the rotation shaft and an engagement pin implanted in the coupling. . 5. The turbine blade polishing apparatus according to claim 1, wherein an attached tank having no bottom or a shallow bottom is fixed to the vibration tank so that the capacity of the vibration tank can be changed. 6. A revolving frame is suspended from a lifting beam via a rotatable base, and the revolving frame is rotated to be able to cope with different vibration tanks. A polishing apparatus for a turbine blade according to claim 1.