Machining device for reset shell of steam turbine

Abstract

The utility model discloses a machining device for a reset shell of a steam turbine, and belongs to the field of machining and assembling. A machining device for a reset shell of a steam turbine comprises a plane disc, a supporting base and at least two L-shaped pressing blocks. The plane disc is vertically placed, a step-shaped clamping part matched with a clamping jaw of a four-jaw chuck of the horizontal lathe is arranged on the left side of the plane disc, the supporting base is perpendicular to the plane disc and arranged on the lower portion of the plane disc, the L-shaped pressing block is arranged on the supporting base in an inverted mode, and the top of the L-shaped pressing block is clamped by a reset shell to be machined. A pressing screw rod is arranged on a transverse block at the top of the L-shaped pressing block, and the pressing screw rod is matched with a pressing nut located at the top of the pressing screw rod to lock the reset shell to be machined; a stop block is arranged at the position, close to the end, of the supporting base, and a hole distance positioning block is arranged on one side of the stop block. According to the machining device, an ordinary horizontal lathe can machine inner holes of reset shell products through the machining device, and the coaxiality, the parallelism and the center distance between two holes or between multiple holes are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of mechanical processing and assembly, and more specifically, to a turbine reset shell processing device. Background Technology

[0002] The turbine regulation and safety system involves many reset devices. The internal bore design of the reset device housing (hereinafter referred to as the "reset housing") requires extremely high precision. The parallelism, positional accuracy, and coaxiality between holes must be within 0.02mm. This is compounded by the complex structure of small and deep bores, multiple grooves, steps, and deep blind holes. Currently, the reset housing is generally machined using a boring machine. However, when machining small and deep holes and blind holes, the boring machine suffers from insufficient rigidity of the tool holder, resulting in vibration marks and the hole wall roughness failing to meet the drawing requirements. Furthermore, the boring machine operates on a rotating tool holder (unlike a stationary tool holder on a conventional lathe). When the tool holder rotates, the floating tool tip falls into the groove within the hole, damaging the surface quality and rendering the workpiece unusable. Moreover, due to the various internal grooves within the housing, chip removal is easily impeded during machining of the grooves, causing blockages and damaging the inner hole surface. Therefore, machining the reset housing using a CNC boring machine is inefficient, has a high scrap rate, and is costly.

[0003] In contrast, the boring bar on a conventional horizontal lathe does not require rotation. Increasing the bar diameter strengthens its rigidity, resulting in more powerful chip cutting and reducing the likelihood of clogging and elastic deformation. Retraction is also more convenient and flexible. Furthermore, the floating bar is mounted on the tailstock and does not rotate, preventing the floating tip from falling into the inner groove and thus avoiding damage to the inner hole surface and the problem of the tip being unable to retract. If the housing of the reset device could be machined on a conventional horizontal lathe, the technical challenges of boring machines would be solved. However, due to the irregular structure of the housing in the reset device, it is difficult to directly fix it on a conventional horizontal lathe, making machining quite difficult.

[0004] Therefore, there is an urgent need for a turbine reset housing processing device that can fix the reset housing on a conventional horizontal lathe, so as to realize the processing of the reset housing on a conventional horizontal lathe. Utility Model Content

[0005] The purpose of this invention is to provide a turbine reset shell machining device for machining various porous shells on a horizontal lathe. This device can be clamped by the four-jaw chuck of a horizontal lathe and then machined by the boring tool of a horizontal lathe, solving the technical problems caused by boring machine machining, greatly improving machining efficiency and accuracy, and saving machining costs.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A turbine reset casing processing device includes a flat disc, a support base, and at least two L-shaped pressure blocks. The flat disc is placed vertically, and its left side has a stepped clamping part that cooperates with the jaws of a horizontal lathe four-jaw chuck. The support base is perpendicular to the flat disc and located at the lower part of the flat disc. The L-shaped pressure blocks are placed upside down on the support base, and the reset casing to be processed is clamped at the top of the L-shaped pressure blocks. A clamping screw is provided on the horizontal block at the top of the L-shaped pressure block, and the clamping screw cooperates with a clamping nut located at its top to lock the reset casing to be processed. The support base has a stop block near the end, and a hole spacing positioning block is provided on one side of the stop block.

[0008] In a further technical solution, the support base is in the shape of a right triangle, comprising a vertical support plate, a horizontal support plate perpendicular to the vertical support plate, and an inclined support plate between the vertical support plate and the horizontal support plate. The vertical support plate is fixed to the flat disc by fastening screws, and the L-shaped pressure block is placed upside down on the horizontal support plate.

[0009] In a further technical solution, the vertical support plate is provided with two positioning pins, which connect the vertical support plate and the flat disc.

[0010] In a further technical solution, the stop block is fixed to the support base by fixing screws.

[0011] A further technical solution is to provide a tapered pin on the stop block, which reinforces the stop block and the support base.

[0012] In a further technical solution, the number of L-shaped pressure blocks is three or four. Beneficial effects

[0013] Compared with the prior art, the present invention has the following significant advantages:

[0014] 1. This utility model solves the problem of difficult machining of turbine unit reset shell products on ordinary horizontal lathes. By fixing the reset shell product with this device, and then holding the device with the four-jaw chuck of an ordinary horizontal lathe, the multi-hole shell product can be machined by the horizontal lathe and floating boring tool. It can ensure that the coaxiality, parallelism, hole spacing and other geometric tolerances between the holes meet the drawing requirements, so that the dimensional accuracy of the multi-holes is consistent and the surface roughness is improved. It solves the problem of poor chip removal of small holes and multi-groove holes on CNC boring machines, improves machining efficiency and quality, and saves machining costs.

[0015] 2. This utility model is easy to clamp, simple to operate, and easy to reuse multiple times to process various shells. Attached Figure Description

[0016] Figure 1 This is the front view of this utility model;

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

[0018] Figure 3 This is a front view of the fixed housing of this utility model;

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

[0020] Figure 5 A schematic diagram of the four-jaw chuck jaws of a horizontal lathe clamping this utility model;

[0021] The markings in the diagram are: 1. Flat disc; 2. Support base; 3. Clamping screw; 4. Clamping nut; 5. L-shaped pressure block; 6. Fastening screw; 7. Locating pin; 8. Hole spacing positioning block; 9. Stop block; 10. Fixing screw; 11. Tapered pin; 12. Reset housing; 13. Four-jaw chuck jaws; 1-1. Clamping part; 2-1. Vertical support plate; 2-2. Horizontal support plate; 2-3. Inclined support plate; 5-1. Horizontal block. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Example

[0023] like Figure 1 As shown in Figure 5, the turbine reset shell processing device includes a flat disc 1, a support base 2, and at least two L-shaped pressure blocks 5. The flat disc 1 is placed vertically, and its left side is provided with a stepped clamping part 1-1 that cooperates with the jaws of a horizontal lathe four-jaw chuck. The support base 2 is perpendicular to the flat disc 1 and is located at the lower part of the flat disc 1. The L-shaped pressure blocks 5 are placed upside down on the support base 2, and the reset shell 12 to be processed is clamped at the top of the L-shaped pressure blocks 5. A clamping screw 3 is provided on the horizontal block 5-1 at the top of the L-shaped pressure blocks 5. The clamping screw 3 cooperates with the clamping nut 4 located at its top to lock the reset shell 12 to be processed. The support base 2 is provided with a stop block 9 near the end, and a hole spacing positioning block 8 is provided on one side of the stop block 9.

[0024] The support base 2 is in the shape of a right-angled triangle, comprising a vertical support plate 2-1, a horizontal support plate 2-2 perpendicular to the vertical support plate 2-1, and an inclined support plate 2-3 located between the vertical support plate 2-1 and the horizontal support plate 2-2. The vertical support plate 2-1 is fixed to the flat disc 1 by fastening screws 6, and the L-shaped pressure block 5 is placed upside down on the horizontal support plate 2-2. The triangular shape of the support base provides high stability.

[0025] The vertical support plate 2-1 is provided with two positioning pins 7, which connect the vertical support plate 2-1 and the flat disk 1, and play a positioning role to ensure that there is no displacement between the support plate and the flat disk during the processing, so as to ensure the processing accuracy.

[0026] The stop block 9 is fixed to the support base 2 by fixing screws 10. The stop block 9 is provided with a tapered pin 11, which reinforces the stop block 9 and the support base 2.

[0027] The number of L-shaped pressure blocks 5 is three or four. The number of L-shaped pressure blocks can vary depending on the size of the shell, but at least two are required, mainly to secure the shell to be processed and reset.

[0028] The installation and operation methods of this utility model are as follows:

[0029] 1. Fix the support base to the lower part of the flat disc with fastening screws, ensuring that the perpendicularity between the plane of the support base and the disc is less than 0.02mm. Then, use two locating pins to position the support base and the disc, and tighten the four fastening screws.

[0030] 2. Use the four-jaw chuck jaws of a standard horizontal lathe to clamp the left side of the flat disc. Use a dial indicator to calibrate the outer diameter and end face of the disc to ensure they are within 0.01mm.

[0031] 3. Install the stop block on the horizontal support plate of the support base, use a dial indicator to check that the straightness of the stop block is 0 (consistent with the axis of the lathe track), tighten the fixing screws, and install two tapered pins to further reinforce and position it.

[0032] 4. Clamp the housing to be processed onto the support base, ensuring it is flush against the stop block. This will determine the housing's position and guarantee machining accuracy. Then, secure the housing with the clamping screw, nut, and L-shaped pressure block. If the housing is irregularly shaped and its center of gravity is unbalanced, the inner hole may become elliptical during machining, failing to meet the cylindricity requirements. In this case, a counterweight can be appropriately installed on the four-jaw chuck of the horizontal lathe, based on the housing's shape, specifications, and weight, to eliminate the imbalance and ensure the four-jaw chuck is balanced during free rotation.

[0033] 5. After the housing is fixed, first machine one of the holes in the housing. After the hole is machined, loosen the clamping screw and nut to loosen the housing. Install the hole spacing positioning block on one side of the stop block (the hole spacing positioning block must be ground on both positioning surfaces with a grinder to ensure that the tolerance of the two parallel surfaces and the positioning width dimension is 0). Then, fix the housing again with the clamping screw, nut and L-shaped pressure block, and machine another hole on the housing. In this way, the parallelism and center distance between the two or more holes can be guaranteed to be consistent.

[0034] 6. To ensure the machining accuracy of the inner hole of the housing, a floating boring bar can be used for the final finishing. Because the floating boring bar can adjust the dimensional tolerance of the floating head according to the size requirements of the drawing, it can not only ensure that the dimensions of all machined inner holes are uniform, but also improve the surface roughness of the inner hole to within Ra0.8um, which greatly improves the subsequent assembly quality and the sealing, pressure and other test results.

Claims

1. A turbine reset casing processing device, characterized in that: The device includes a flat disc, a support base, and at least two L-shaped clamping blocks. The flat disc is placed vertically, and its left side has a stepped clamping part that cooperates with the jaws of a four-jaw chuck on a horizontal lathe. The support base is perpendicular to the flat disc and is located at the lower part of the flat disc. The L-shaped clamping blocks are placed upside down on the support base, and the top of the L-shaped clamping blocks is used to hold the housing to be processed and reset. A clamping screw is provided on the horizontal block at the top of the L-shaped clamping blocks, and the clamping screw cooperates with the clamping nut located at its top to lock the housing to be processed and reset. The support base has a stop block near the end, and a hole spacing positioning block is provided on one side of the stop block.

2. The turbine reset casing processing device according to claim 1, characterized in that: The support base is in the shape of a right triangle and includes a vertical support plate, a horizontal support plate perpendicular to the vertical support plate, and an inclined support plate between the vertical support plate and the horizontal support plate. The vertical support plate is fixed to the flat disc by fastening screws, and the L-shaped pressure block is placed upside down on the horizontal support plate.

3. The turbine reset casing processing device according to claim 2, characterized in that: The vertical support plate is provided with two positioning pins, which connect the vertical support plate and the flat disc.

4. The turbine reset casing processing device according to claim 1, characterized in that: The stop block is fixed to the support base by fixing screws.

5. The turbine reset casing processing device according to claim 1, characterized in that: The stop block is equipped with a tapered pin, which reinforces the stop block and the support base.

6. The turbine reset casing processing device according to claim 1, characterized in that: The number of L-shaped pressure blocks is three or four.

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