A gas turbine compressor wheel disk mortise broaching device

Abstract

The present application aims at providing a gas turbine compressor wheel disk mortise broaching device, belonging to the field of gas turbine processing, comprising 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 face 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; the boss is pressed on the upper end face of the base and located in the main positioning shaft; the part of the pressing rod above the boss is sleeved with the dismounting frame; the wheel disk is placed on the base and sleeved outside the main positioning shaft and the dismounting frame; the position where the bottom of the wheel disk cooperates with the base is provided with an anti-rotation key; the bottom of the wheel disk is provided with a positioning groove; the positioning groove cooperates with the anti-rotation key in clearance; the lower end of the gland is installed at the end face of the wheel disk; and the top of the pressing rod extends out of the gland. After the compressor wheel disk mortise is broached by the present application, the wheel disk deformation is reduced, the processing precision and efficiency are improved.

Description

Technical Field

[0001] The present invention relates to a gas turbine processing apparatus, specifically a compressor disc processing apparatus. Background Technology

[0002] The compressor disc, a critical rotating load-bearing component in a gas turbine, is one of the parts with the highest precision requirements. It connects the main shaft and the rotating blades, delivering work to the air flowing through it and increasing its pressure. Gas turbines operate in extremely harsh environments, and the compressor disc must function stably under high temperature and pressure. Therefore, the disc material needs to possess high strength and high temperature resistance. The tenon grooves on the compressor disc are used to mount the blades, and tenon groove machining is the most crucial process involved in the disc's manufacturing. Technical requirements include a tenon groove P-value deviation of no more than 0.01 mm within a single groove area and a difference in dimensional P between all tenons on a single disc of the disc no more than 0.02 mm, demanding extremely high precision.

[0003] Currently, the tenon and groove machining method adopts broaching. The rationality of the broaching device design directly affects the deformation of the compressor wheel after broaching, the machining accuracy, and the machining efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a gas turbine compressor disc tenon and groove broaching device that can solve the problems of large deformation of the compressor disc after broaching, low machining accuracy and low machining efficiency.

[0005] The objective of this invention is achieved as follows:

[0006] This invention discloses a gas turbine compressor disc tenoning device, characterized by comprising a base, a main positioning shaft, a clamping rod, a pressure cap, and a disassembly frame. The base has an inner hole, the main positioning shaft is fixed on the upper end face of the base, the lower part of the clamping rod has a boss, the bottom of the clamping rod extends into the inner hole of the base, the boss presses against the upper end face of the base and is located inside the main positioning shaft, the part of the clamping rod above the boss is fitted with the disassembly frame, the disc is placed on the base and fitted outside the main positioning shaft and the disassembly frame, an anti-rotation key is provided at the position where the bottom of the disc mates with the base, the bottom of the disc has a positioning groove, the positioning groove and the anti-rotation key are clearance-fitted, the lower end of the pressure cap is installed at the end face of the disc, and the top of the clamping rod extends upward through the pressure cap.

[0007] The present invention may also include:

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

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

[0010] 3. A clamping and positioning block is installed in the base. An elastic washer is installed on the outside of the clamping and positioning block. The tension bolt passes through the elastic washer and is connected to the clamping and positioning block. A telescopic spring is fitted on the tension bolt. The telescopic spring fits the elastic washer to the outer circle of the wheel.

[0011] 4. When tightening the tension bolts, use the locating pins to secure them.

[0012] 5. An indexing plate is installed under the base. A protrusion is set in the middle of the indexing plate. The protrusion is installed in the inner hole of the base through a bushing. The bushing is installed into the inner hole of the base using liquid nitrogen for freezing.

[0013] 6. The bushing and the indexing plate are fitted with a small clearance.

[0014] 7. The disassembly frame is equipped with a nylon pad, and the wheel is fitted onto the nylon pad of the disassembly frame.

[0015] The advantages of this invention are as follows: The connecting base and the indexing plate do not directly contact each other, avoiding the scrapping of critical mating dimensions and saving costs. A spring moves the elastic washer to the position where it mates with the outer circle of the wheel, preventing deformation of the part during broaching. Positioning grooves are provided on the pressure cap and disassembly frame, which, with a small clearance fit with the guide key A, better achieve their positioning function, ensuring part machining accuracy. A nylon pad is installed on the disassembly frame to prevent scratches on the part surface. The spherical washer and the stop block automatically level themselves upon contact, ensuring uniform force on the pressure cap and preventing part deformation. The anti-rotation key, with a small clearance fit with the wheel's positioning groove, allows for better wheel positioning and improves its positioning accuracy. Using this device for broaching the tenon groove of the compressor wheel reduces wheel deformation and improves machining accuracy and efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention;

[0017] Figure 2 This is a top view of the present invention;

[0018] Figure 3 AA view;

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

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

[0021] Figure 6 This is a schematic diagram of the clamping rod structure. Detailed Implementation

[0022] The invention will now be described in more detail 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 ball washer 3, a stop block 4, a guide key type A 5, an M5X12 slotted cylindrical head screw 6, a pressure cap 7, a disassembly bracket 8, an M12X40 socket head cap screw 10, a connecting base 11, an anti-rotation key 12, an M3X12 socket head cap screw 13, a bushing 14, an M6X80 socket head cap 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, and a main positioning shaft 23, etc.

[0024] The bushing 14 is installed into the connecting base 11 at its mating position using liquid nitrogen freezing. The anti-rotation key 12 is installed into the groove of the connecting base 11 using M3X12 internal hexagonal head screws 13. When installing the bushing 14, avoid installing it off-center to prevent affecting 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, install them onto the end face of the connecting base 11 using M12X40 socket head cap screws 10.

[0026] Install the main positioning shaft 23 and the clamping rod 1 onto the end face and inner hole of the connecting base 11 using M12X40 internal hexagonal head screws 10.

[0027] Install the guide key A type 5 to the keyway of the clamping rod 1 using M5X12 slotted cylindrical head screws 6, and prevent the key from being bumped during installation.

[0028] Use lifting rings to hoist the main body of the device to the corresponding mating position on the indexing plate 16, and use M6X80 socket head cap screws 15 to fix it. Use a dial indicator to measure the runout of the outer circle of the main positioning shaft 23. After the runout meets the process requirements, proceed to the next step.

[0029] Install the wheel 9 onto the nylon pad of the disassembly frame 8. Use the lifting ring to hoist the disassembly frame 8 and the wheel 9 together to the mating position of the main positioning shaft 23. The positioning groove of the wheel 9 is installed in conjunction with the anti-rotation key 12. Hoist the pressure cover 7 onto the end face of the wheel 9. During installation, take care to prevent parts from being bumped or damaged.

[0030] The stop block 4 and the spherical washer 3 are installed sequentially on the end face of the pressure cover 7. The high pressure nut 2 is pre-tightened, and the tension bolt 20 is tightened so that the telescopic spring 19 fits the elastic washer 18 to the outer circle position of the wheel 9. The outer circle position of the wheel 9 is measured with a dial indicator. When the runout value of the wheel 9 meets the requirements of the process drawing, the high pressure nut 2 is tightened, and the tenon groove of the compressor wheel is broached.

[0031] The bushing 14 is installed with the connecting base 11 by liquid nitrogen freezing and an interference fit. The bushing 14 and the indexing plate 16 are fitted with a small clearance to prevent the connecting base 11 and the indexing plate 16 from having too much direct contact, which would cause the connecting base 11 to become too large and thus scrap the connecting base 11. When the bushing 14 becomes too large, a new bushing 14 can be directly replaced, saving costs.

[0032] When the tension bolt 20 is tightened, the locating pin 21 fixes it in place. The telescopic spring 19 drives the elastic washer 18 to move to the position that matches the outer diameter of the compressor wheel 9, preventing the outer diameter of the compressor wheel from deforming beyond tolerance during the broaching process. The movable elastic washer 18 can be used for broaching on compressor wheels with different outer diameters. Considering the universality of the tooling, it saves costs and controls the deformation of parts.

[0033] The pressure cap 7 consists of a pressure cap bushing 7-1, a pressure cap rib 7-2, a pressure cap body 7-3, and a lifting eye bolt 7-4. The pressure cap bushing 7-1 has a groove. The pressure cap 7 is installed on the groove of the wheel disc 9 and has a small clearance fit with the guide key A-type 5 to prevent the pressure cap 7 from moving and to better achieve the positioning function. The pressure cap body 7-3 is machined with oblique grooves of the same angle and number as the wheel disc tenon groove, so that the pressure cap 7 has a greater contact with the parts, preventing the parts from deforming during processing and improving processing efficiency.

[0034] The disassembly frame 8 consists of a nylon pad 8-5, a cross-head countersunk screw 8-6, a socket head cap screw 8-3, a bent plate 8-4, a tie rod 8-1, and a bushing 8-2. The nylon pad 8-5 is installed on the disassembly frame 8 to prevent scratches on the surface of the parts. A groove is cut at the bushing 8-2 to prevent the parts from moving during installation and to provide a positioning function. The socket head cap screw 8-3 is used to lift the parts if they are slightly deformed after broaching and cannot be disassembled.

[0035] The upper end of the pressure cap 7 is equipped with a ball washer 3 and a stop block 4. When the high pressure nut 2 is tightened, the ball washer 3 and the stop block 4 will automatically level themselves, so that the surface of the pressure cap 7 is in full contact with the surface of the wheel 9, so that the force is evenly distributed and the parts are prevented from deforming.

[0036] The anti-rotation key 12 and the positioning groove of the wheel 9 are fitted with a small clearance, which enables the wheel 9 to be positioned better and improves its positioning accuracy, so as to ensure the position accuracy of the wheel mortise and tenon when it is broached.

Claims

1. A gas turbine compressor wheel disk tenon slot broaching apparatus characterized by: The base is provided with an inner hole, the main positioning shaft is fixed on the upper end face 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, the boss is pressed on the upper end face of the base and located in the main positioning shaft, the part of the pressing rod above the boss is sleeved with the dismounting frame, the wheel disc is arranged on the base and sleeved outside the main positioning shaft and the dismounting frame, the position where the bottom of the wheel disc cooperates with the base is provided with an anti-rotation key, the bottom of the wheel disc is provided with a positioning groove, the positioning groove cooperates with the anti-rotation key in clearance, the lower end of the pressing cover is installed at the end face of the wheel disc, and the top of the pressing rod is upwardly out of the pressing cover. The pressing cover comprises a pressing cover body and a pressing cover sleeve, the pressing cover sleeve is located above the pressing cover body, and the pressing cover sleeve is connected with the pressing cover body through a pressing cover rib plate; the outer part of the pressing rod above the pressing cover sleeve is sleeved with a stop block and a spherical washer, the outer part of the pressing rod above the spherical washer is installed with a high-pressure nut, and the rotation of the high-pressure nut presses the spherical washer, the stop block and the pressing cover sleeve downward until the pressing cover body is pressed; A key groove is arranged on the inner side of the pressing cover sleeve, and a guide key is installed at the key groove; The dismounting frame is composed of a nylon pad, a cross slot countersunk screw, an inner hexagonal cylindrical head screw, a bent plate, a reinforcing rib and a shaft sleeve, the nylon pad is installed on the dismounting frame to prevent scratching of the surface of the part, a groove is arranged at the position of the shaft sleeve to prevent the part from moving when the part is installed on the dismounting frame, the inner hexagonal cylindrical head screw is used to smoothly dismount the part when the part is slightly deformed after being broached, and the inner hexagonal cylindrical head screw is used to expand the part.

2. A gas turbine compressor wheel mortise broaching apparatus as defined in claim 1 wherein: A clamping positioning block is arranged in the base, an elastic washer is installed on the outer side of the clamping positioning block, a tensioning bolt passes through the elastic washer and connects the clamping positioning block, an extension spring is sleeved on the tensioning bolt, and the extension spring cooperates with the elastic washer to the position of the outer circle of the wheel disc.

3. A gas turbine compressor wheel mortise broaching apparatus as defined in claim 2 wherein: When the tensioning bolt is tightened, the positioning pin is installed to fix the tensioning bolt.

4. A gas turbine compressor wheel mortise broaching apparatus as defined in Claim 1 wherein: A dividing disc is installed below the base, a protrusion is arranged in the middle of the dividing disc, the protrusion is installed in the inner hole of the base through a bushing, and the bushing is installed in the inner hole of the base by being frozen with liquid nitrogen.

5. A gas turbine compressor wheel hub mortise broaching apparatus as defined in Claim 4 wherein: The bushing cooperates with the dividing disc in a small gap.

6. A gas turbine compressor wheel mortise broaching apparatus as defined in Claim 1 wherein: The dismounting frame is provided with a nylon pad, and the wheel disc is sleeved at the nylon pad of the dismounting frame.

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