Tongue-and-groove broaching device for wheel disc of gas compressor of gas turbine

Abstract

The invention aims to provide a gas turbine compressor wheel disc mortise broaching device, which belongs to the field of gas turbine machining, and comprises a base, a main positioning shaft, a pressing rod, a gland and a dismounting frame, the base is provided with an inner hole, the main positioning shaft is fixed on the upper end surface of the base, the lower part of the pressing rod is provided with a boss, the bottom of the pressing rod extends into the inner hole of the base, and the boss is fixed on the bottom of the pressing rod. The boss is pressed on the upper end face of the base and located in the main positioning shaft, the portion, located above the boss, of the pressing rod is sleeved with the disassembling frame, the wheel disc is arranged on the base and arranged outside the main positioning shaft and the disassembling frame in a sleeved mode, an anti-rotation key is arranged at the position, matched with the base, of the bottom of the wheel disc, and a positioning groove is formed in the bottom of the wheel disc and is in clearance fit with the anti-rotation key. The lower end of the gland is installed on the end face of the wheel disc, and the top of the pressing rod upwards penetrates out of the gland. After broaching is conducted on the compressor wheel disc mortise, deformation of the wheel disc is reduced, and the machining precision and the machining efficiency are improved.

Description

Technical Field

[0001] The present invention relates to a gas turbine machining device, in particular to a compressor wheel machining device. Background Art

[0002] As a key rotating load-bearing component in the gas turbine, the gas turbine compressor wheel is one of the parts with the highest working precision requirements. It is also connected to the main shaft and blades to rotate at high temperature, doing work for the air flowing through it and increasing the air pressure. The working environment of the gas turbine is very harsh, and the compressor wheel needs to work stably in a high temperature and high pressure environment. Therefore, the material of the wheel needs to have high strength and high temperature resistance. The tenon of the compressor wheel is used to install the blades. The tenon processing is the most important process in the processing technology involved in the wheel. The tenon P value deviation within a tenon range of the drawing is not greater than 0.01mm, and the difference in the size P of each tenon of a wheel is not greater than 0.02mm. Technical requirements require high precision.

[0003] At present, the mortise and tenon processing method adopts broaching. The rationality of the broaching device design directly affects the deformation size of the compressor wheel after broaching, the processing accuracy and processing efficiency. Summary of the invention

[0004] The object of the present invention is to provide a gas turbine compressor wheel tenon broaching device which can solve the problems of large compressor wheel deformation after broaching, low machining accuracy and machining efficiency, etc.

[0005] The object of the present invention is achieved in that:

[0006] The present invention discloses a gas turbine compressor wheel tenon and groove broaching device, which is characterized in that it includes a base, a main positioning shaft, a clamping rod, a pressure cover, and a disassembly frame. The base is provided with an inner hole, the main positioning shaft is fixed on the upper end surface of the base, a boss is provided at the lower part of the clamping rod, the bottom of the clamping rod extends into the inner hole of the base, the boss is pressed on the upper end surface of the base and is located in the main positioning shaft, the clamping rod part located above the boss is sleeved with the disassembly frame, the wheel is placed on the base and sleeved on the main positioning shaft and the outside of the disassembly frame, an anti-rotation key is provided at the position where the bottom of the wheel cooperates with the base, a positioning groove is provided at the bottom of the wheel, the positioning groove is clearance-matched with the anti-rotation key, the lower end of the pressure cover is installed at the end surface of the wheel, and the top of the clamping rod passes through the pressure cover upward.

[0007] The present invention may also include:

[0008] 1. The gland includes a gland body and a gland bushing. The gland bushing is located above the gland body and is connected to the gland body through a gland rib. The clamping rod above the gland bushing is covered with a block and a spherical washer. A high-pressure nut is installed outside the clamping rod above the spherical washer. The rotation of the high-pressure nut presses down the spherical washer, the block and the gland bushing until they are pressed against the gland body.

[0009] 2. A keyway is provided on the clamping rod on the inner side of the gland bushing, and a guide flat key is installed at the keyway.

[0010] 3. A clamping positioning block is arranged in the base, an elastic washer is installed on the outside of the tightening positioning block, a tensioning bolt passes through the elastic washer and is connected to the tightening positioning block, a telescopic spring is sleeved on the tensioning bolt, and the telescopic spring fits the elastic washer to the outer circle position of the wheel disc.

[0011] 4. When tightening the tension bolt, secure it by installing the positioning pin.

[0012] 5. A dividing plate is installed under the base, a protrusion is set in the middle of the dividing plate, the protrusion is installed in the inner hole of the base through a bushing, and the bushing is frozen into the inner hole of the base with liquid nitrogen.

[0013] 6. The bushing and the dividing plate are matched with a small clearance.

[0014] 7. The disassembly frame is provided with a nylon pad, and the wheel is sleeved on the nylon pad of the disassembly frame.

[0015] The advantages of the present invention are as follows: the connecting base and the dividing plate are not in direct contact with each other, thus avoiding the scrapping of the important matching dimensions of the connecting base due to out-of-tolerance, thus saving costs. The spring drives the elastic gasket to move to a position matching the outer circle of the wheel disc, thus preventing the parts from being deformed during the broaching process; positioning grooves are provided on the pressure cover and the disassembly frame, which cooperate with the small clearance of the guide flat key A to better realize its positioning function and ensure the processing accuracy of the parts; a nylon pad is installed on the disassembly frame to prevent the surface of the parts from being scratched; the contact between the spherical gasket and the block will automatically level the pressure cover, so that the force is evenly applied to prevent deformation of the parts; the anti-rotation key cooperates with the small clearance of the wheel disc positioning groove to better position the wheel disc and improve its positioning accuracy. By adopting this device to perform tenon broaching on the compressor wheel disc, the deformation of the wheel disc is reduced, and the processing accuracy and efficiency are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] Figure 2 A top view of the present invention;

[0018] Figure 3 It is AA view;

[0019] Figure 4 It is a schematic diagram of the gland structure;

[0020] Figure 5 It is a schematic diagram of the disassembly frame structure;

[0021] Figure 6 Schematic diagram of the clamping rod structure. DETAILED DESCRIPTION

[0022] The present invention is described in more detail below with reference to the accompanying drawings:

[0023] Combination Figure 1-6 The present invention includes a clamping rod 1, a high-pressure nut 2, a spherical washer 3, a stopper 4, a guide flat key A type 5, an M5X12 slotted cylindrical head screw 6, a pressure cover 7, a disassembly frame 8, an M12X40 hexagon socket cylindrical head screw 10, a connecting base 11, an anti-rotation key 12, an M3X12 hexagon socket cylindrical head screw 13, a bushing 14, an M6X80 hexagon socket cylindrical head screw 15, a slider 17, an elastic washer 18, a telescopic spring 19, a tension bolt 20, a positioning pin 21, a clamping positioning block 22, a main positioning shaft 23, etc.

[0024] The bushing 14 is frozen with liquid nitrogen and installed into the matching position of the connecting base 11. The anti-rotation key 12 is installed in the groove of the connecting base 11 through the M3X12 hexagon socket head screw 13. When installing the bushing 14, avoid installing it off-center to affect its positioning accuracy.

[0025] After assembling the slider 17, elastic washer 18, telescopic spring 19, tension bolt 20, positioning pin 21, and clamping positioning block 22, use M12X40 hexagon socket head screw 10 to install them to the end surface of the connecting base 11.

[0026] The main positioning shaft 23 and the clamping rod 1 are installed to the matching position between the end surface and the inner hole of the connecting base 11 through the M12X40 hexagon socket head screw 10.

[0027] Install the guide flat key type A 5 to the keyway of the clamping rod 1 through the M5X12 slotted cylindrical head screw 6 to prevent the key from colliding during installation.

[0028] Use the lifting ring to hoist the main body of the device to the corresponding matching position of the dividing plate 16, fix it with the M6X80 hexagon socket head screw 15, and use the micrometer to measure the outer circle runout of the main positioning shaft 23. After the runout meets the process requirements, proceed to the next step.

[0029] Install the wheel disc 9 to the nylon pad of the disassembly frame 8, and use the lifting ring to lift the disassembly frame 8 and the wheel disc 9 to the matching position of the main positioning shaft 23. The positioning groove of the wheel disc 9 is installed in conjunction with the anti-rotation key 12, and the pressure cover 7 is lifted and installed to the end face of the wheel disc 9. Pay attention to control during installation to prevent parts from being bumped and damaged.

[0030] The block 4 and the spherical washer 3 are sequentially installed to the end face of the gland 7, pre-tightened with the high-pressure nut 2, and the tensioning bolt 20 is tightened to make the telescopic spring 19 fit the elastic washer 18 to the outer circumference position of the wheel disc 9. The outer circumference position of the wheel disc 9 is measured with a dial indicator. When the runout value of the wheel disc 9 meets the requirements of the process drawing, the high-pressure nut 2 is tightened and the compressor wheel mortise and tenon broaching process is started.

[0031] The bushing 14 is frozen with liquid nitrogen and installed with an interference fit with the connecting base 11. The bushing 14 and the dividing plate 16 are matched with a small gap to prevent excessive direct contact between the connecting base 11 and the dividing plate 16, which would cause the connecting base 11 to be too large in size and cause the connecting base 11 to be scrapped. When the bushing 14 size becomes larger, it can be directly replaced with a new bushing 14, saving costs.

[0032] When the tensioning bolt 20 is tightened, the positioning pin 21 fixes it, and the telescopic spring 19 drives the elastic washer 18 to move to a position that cooperates with the outer circle of the wheel 9 to prevent the outer circle size of the compressor wheel from being deformed beyond the tolerance during the broaching process. The mobility of the elastic washer 18 can be used for broaching on compressor wheels with different outer circle sizes. Considering the versatility of the tooling, costs are saved and deformation of parts is controlled.

[0033] The gland 7 is composed of a gland bushing 7-1, a gland rib 7-2, a gland body 7-3, and an eye bolt 7-4. The gland bushing 7-1 is grooved, and the gland 7 is installed on the groove of the wheel 9 with a small gap with the guide flat key A type 5 to prevent the gland 7 from moving and better realize the positioning function. The gland body 7-3 is processed with inclined grooves with the same angle and number as the wheel mortise and tenon, so that the gland 7 can contact the parts to a greater extent, prevent the parts from deformation during processing, and improve the processing efficiency.

[0034] The disassembly frame 8 is composed of a nylon pad 8-5, a cross recessed countersunk screw 8-6, a hexagon socket head screw 8-3, a bent plate 8-4, a tie rod 8-1, and a sleeve 8-2. A nylon pad 8-5 is installed on the disassembly frame 8 to prevent the surface of the parts from being scratched. A slot is opened at the position of the sleeve 8-2 to prevent the parts from moving when installed with the disassembly frame 8, thereby playing a positioning role. The hexagon socket head screw 8-3 plays a role in that if the parts are slightly deformed and cannot be disassembled after the parts are broached, the hexagon socket head screw 8-3 can be used to lift the parts and disassemble them smoothly.

[0035] The spherical washer 3 and the stopper 4 are installed on the upper end of the gland 7. When the high-pressure nut 2 is tightened, the spherical washer 3 and the stopper 4 will automatically level when in contact, so that the surface of the gland 7 is in full contact with the surface of the wheel 9, so that the force is evenly applied to prevent deformation of the parts.

[0036] The anti-rotation key 12 cooperates with the positioning groove of the wheel disc 9 with a small clearance, so that the wheel disc 9 is better positioned, its positioning accuracy is improved, and the position accuracy is guaranteed when the wheel disc tenon groove is broached.

Claims

1. A gas turbine compressor wheel disc tenon and groove broaching device, characterized in that: It includes a base, a main positioning shaft, a clamping rod, a pressure cover, and a disassembly frame. The base is provided with an inner hole, the main positioning shaft is fixed on the upper end surface of the base, a boss is provided at the lower part of the clamping rod, the bottom of the clamping rod extends into the inner hole of the base, the boss is pressed on the upper end surface of the base and is located in the main positioning shaft, the clamping rod part located above the boss is sleeved with the disassembly frame, the wheel disc is placed on the base and sleeved on the outside of the main positioning shaft and the disassembly frame, an anti-rotation key is provided at the position where the bottom of the wheel disc cooperates with the base, a positioning groove is provided at the bottom of the wheel disc, the positioning groove and the anti-rotation key are clearance-matched, the lower end of the pressure cover is installed at the end surface of the wheel disc, and the top of the clamping rod passes through the pressure cover upward.

2. A gas turbine compressor wheel disc tenon and groove broaching device according to claim 1, characterized in that: The gland includes a gland body and a gland bushing. The gland bushing is located above the gland body and is connected to the gland body through a gland rib. The outside of the clamping rod above the gland bushing is covered with a block and a spherical washer, and a high-pressure nut is installed outside the clamping rod above the spherical washer. The rotation of the high-pressure nut presses down the spherical washer, the block and the gland bushing until they are pressed against the gland body.

3. A gas turbine compressor wheel disc tenon and groove broaching device according to claim 2, characterized in that: A keyway is provided on the clamping rod on the inner side of the gland bushing, and a guide flat key is installed at the keyway.

4. A gas turbine compressor wheel disc tenon and groove broaching device according to claim 1, characterized in that: A clamping positioning block is arranged in the base, an elastic washer is installed outside the tightening positioning block, a tensioning bolt passes through the elastic washer and is connected to the tightening positioning block, a telescopic spring is sleeved on the tensioning bolt, and the telescopic spring matches the elastic washer to the outer circle position of the wheel disc.

5. A gas turbine compressor wheel disc tenon and groove broaching device according to claim 4, characterized in that: When the tension bolt is tightened, secure it by installing the dowel pin.

6. A gas turbine compressor wheel disc tenon and groove broaching device according to claim 1, characterized in that: A dividing plate is installed below the base, a protrusion is arranged in the middle of the dividing plate, the protrusion is installed in the inner hole of the base through a bushing, and the bushing is frozen into the inner hole of the base by liquid nitrogen.

7. A gas turbine compressor wheel disc tenon and groove broaching device according to claim 6, characterized in that: The bushing and the indexing plate are matched with a small clearance.

8. A gas turbine compressor wheel disc tenon and groove broaching device according to claim 1, characterized in that: The disassembly frame is provided with a nylon pad, and the wheel disc is sleeved on the nylon pad of the disassembly frame.

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