Vertical turning clamping method and device

Abstract

The invention discloses a vertical turning and clamping method and device.The vertical turning and clamping method comprises the steps that according to machining of a heat shield in the first direction, an original clamping jaw is detached, a high-point heightening workbench with a lengthened clamping jaw and a jack is installed, and stable supporting and clamping of the irregular profile of a special-shaped workpiece are achieved; and the processing stability of the straight cylinder end in a vertical state is ensured. And for machining in the second direction, the equal-height cushion blocks are arranged, the standard clamping jaws are reused, and the jack is used for supporting, so that precise positioning and reliable fixing after the workpiece is turned over are achieved. According to the method, through the structured tool combination and the adjustable supporting points, the workpiece is evenly stressed and effectively protected in the two times of clamping, and clamping deformation is avoided. The safety and the size precision in the machining process are guaranteed, the main pump heat shield is renovated, and a reproducible and standardized technological method is provided for turning of similar large special-shaped components.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant component maintenance technology, and in particular to a vertical turning clamping method and device. Background Technology

[0002] The main pump, as a key core piece of equipment in nuclear power plant facilities, is known as the heart of the plant, and its operational reliability is directly related to the safe and stable operation of the nuclear power plant. The main pump consists of the main pump hydraulic components, the main pump motor, and the shaft seal assembly. Among them, the thermal shield is an important irregular component in the main pump hydraulic components. It is characterized by its large size and irregular shape, with a height of about 1200mm. The straight end is filled with material and cannot be used as a clamping support reference.

[0003] In the early days, the main pumps of domestic nuclear power plants were supplied by France. The processing and maintenance technology of their hydraulic components was considered a core secret by foreign manufacturers. China lacked the relevant technical accumulation and practical experience in independent refurbishment and repair. As a result, when the hydraulic components of the main pumps were damaged, they could only be shipped abroad for repair and refurbishment. This not only resulted in high repair costs and long cycles, but also posed safety risks and technical dependence risks during equipment transportation, which seriously restricted the improvement of the independent maintenance capabilities of domestic nuclear power plants.

[0004] With the development of China's nuclear power industry and the urgent need for independent maintenance, the independent refurbishment and repair of main pump hydraulic components has become a key aspect of core capability building. The machining of the heat shield is a crucial step in the refurbishment and repair of main pump hydraulic components. This process requires precise machining of multiple mating surfaces and inner diameters in both the sealing chamber mating end direction and the large flat end direction. This necessitates that the heat shield be able to achieve stable clamping in both directions during machining.

[0005] However, because the thermal shield is a large, irregularly shaped component, the straight end cannot provide effective clamping support. Existing standard chucks and clamping methods on vertical CNC lathes cannot directly achieve secure clamping of the thermal shield: direct clamping easily leads to the risk of loosening and falling during processing, and may also cause surface deformation; furthermore, existing clamping structures cannot accurately align the thermal shield, making it difficult to meet the dimensional accuracy requirements of thermal shield processing. In addition, for the processing needs of the thermal shield in two directions, existing technologies lack clamping solutions that can quickly switch and adapt to different processing directions, failing to achieve efficient and accurate clamping for processing the thermal shield in different directions, seriously affecting the processing quality of the thermal shield and the overall efficiency of the refurbishment and repair of the main pump hydraulic components. Summary of the Invention

[0006] The purpose of this invention is to provide a vertical turning clamping method and device, which aims to solve the problems of the lack of clamping schemes in the prior art that can quickly switch and adapt to different machining directions.

[0007] This invention provides a vertical turning clamping method, comprising: Remove the jaws from the chuck of the vertical CNC lathe, insert the first nut into the groove of the worktable surface of the chuck, and tighten the three high-point raising worktables. Install extended claws and jacks on the platform of each of the aforementioned height-increasing workbenches; The heat shield is hoisted onto the height-increasing worktable with its flat end facing upwards, so that the straight end face of the heat shield is perpendicular to the worktable of the vertical CNC lathe, and a specific plane of the heat shield is supported by the jack; wherein, the specific plane is the end face of the heat shield that mates with the diffuser. The extended jaws are used to clamp the outer circle of the heat shield to complete the first-direction clamping of the heat shield; After machining multiple mating surfaces and inner diameter of the large flat end of the heat shield, the machined heat shield is lifted off the chuck worktable, and the high-point lifting worktable and the first nut are removed from the chuck worktable. Install a second nut in the groove of the chuck worktable, fix the equal height pad, and install the standard jaws into the groove of the chuck worktable; The heat shield is hoisted into the standard jaw with its cylindrical end facing upwards, so that the large flat end of the heat shield is supported on the level pad, and a jack is placed between the chuck worktable and the large flat end. The outer circle of the large flat end of the heat shield is clamped using the standard jaws to complete the second-direction clamping of the heat shield.

[0008] Furthermore, securing the three high-point heightening workbench includes: Based on the external dimensions of the heat shield, three height-increasing workbenches are hoisted and placed on the worktable of the chuck. A first screw is screwed into the foot hole of each height-increasing workbench, and the first nut is screwed into the first screw.

[0009] Furthermore, the installation of extended claws on the table surface of each of the height-increasing workbenches includes: placing a third nut in the T-shaped groove of the table surface of the height-increasing workbench, placing the extended claws on the table surface of the height-increasing workbench, and locking them to the third nut with a screw that passes through the third nut.

[0010] Furthermore, the method also includes: The heat shield is fixed using multiple height-adjusting workbenches. After the specific plane of the heat shield is supported by the jack, the following is included: The height-increasing worktable is placed on the chuck worktable in sequence, and the height-increasing worktable is fixed by the corresponding foot nuts and screws.

[0011] Furthermore, the step of using the extended claws to clamp the outer circumference of the heat shield includes: Adjust the position of the extended claw on the table surface of the height-increasing workbench, and place a buffer between the extended claw and the heat screen until the extended claw clamps the outer circle of the heat screen.

[0012] Furthermore, the step of installing a second nut in the groove of the chuck worktable to fix the leveling block includes: The second nut is placed at a symmetrical point in the groove of the chuck worktable, and a screw is inserted into the second nut. The equal height pad is then screwed on and tightened.

[0013] Furthermore, before suspending the heat shield into the standard jaw with the cylindrical end facing upward, the method further includes: detecting the height of the equal-height pads to ensure that the height of each equal-height pad is the same.

[0014] Furthermore, the step of using the standard jaws to clamp the outer circle of the large flat end of the heat screen includes: adjusting the position of the standard jaws and placing a buffer between the standard jaws and the diffuser until the standard jaws clamp the outer circle of the large flat end of the heat screen.

[0015] This invention also provides a vertical turning clamping device, applied to the above-mentioned vertical turning clamping method, comprising: a chuck worktable, a high-point lifting worktable, an extended jaw, a standard jaw, a leveling block, and a jack. The high-point lifting worktable, the standard jaw, and the leveling block are disposed on the chuck worktable, and the extended jaw and the jack are disposed on the high-point lifting worktable.

[0016] Furthermore, it also includes: multiple buffers, which are respectively disposed on the extended jaw and the standard jaw.

[0017] This invention discloses a vertical turning clamping method and apparatus. The vertical turning clamping method includes: removing the jaws from the chuck of a vertical CNC lathe; inserting a first nut into the groove of the chuck's worktable and tightening three high-point lifting worktables; installing extended jaws and jacks on the table surfaces of each of the high-point lifting worktables; hoisting a heat shield with its large flat end facing upwards onto the high-point lifting worktables, so that the straight cylindrical end face of the heat shield is perpendicular to the worktable surface of the vertical CNC lathe, and supporting a specific plane of the heat shield with the jacks; wherein, the specific plane is the end face of the heat shield that mates with the diffuser; using the extended jaws to clamp the outer circle of the heat shield to complete the first-direction clamping of the heat shield; when After machining multiple mating surfaces and the inner diameter of the large flat end of the heat shield, the machined heat shield is lifted off the chuck table, and the high-point lifting platform and the first nut are removed from the chuck table. A second nut is installed in the groove of the chuck table, a leveling block is fixed, and a standard jaw is installed in the groove of the chuck table. The heat shield is lifted into the standard jaw with its cylindrical end facing upward, so that the large flat end of the heat shield is supported on the leveling block, and a jack is placed between the chuck table and the large flat end. The standard jaw clamps the outer circle of the large flat end of the heat shield to complete the second-direction clamping of the heat shield. This method, through structured tooling combinations and adjustable support points, ensures that the workpiece receives uniform force and effective protection in both clamping operations, avoiding clamping deformation. This not only ensured the safety and dimensional accuracy of the machining process and enabled the refurbishment of the main pump heat shield, but also provided a replicable and standardized process method for the turning of similar large and irregular parts. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a flowchart illustrating the vertical turning clamping method. Figure 2 This is a schematic diagram of the thermal shield structure; Figure 3 This is a schematic diagram of the vertical turning clamping device clamping the heat shield. Figure 4 This is a schematic diagram of the vertical turning clamping device with the heat shield reversed clamp; Figure 5 for Figure 4 A partial view of part a; Explanation of the labels in the diagram: 1. Chuck worktable; 2. High-point lifting worktable; 3. Extended chuck jaws; 4. Standard chuck jaws; 5. Jack; 6. Buffer components. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be understood that, when used in this specification and the appended claims, the terms “comprising” and “including” indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0022] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0023] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0024] Please see Figures 1-4 This embodiment provides a vertical turning clamping method, including: S101: Remove the jaws from the chuck of the vertical CNC lathe, insert the first nut into the groove of the worktable surface of the chuck, and tighten the three high-point raising worktables. Specifically, remove the four jaws from the chuck of the vertical CNC lathe, and insert T-nuts (as the first nuts) in sequence into the symmetrical points of the T-slots on the end face of the chuck worktable to secure the feet of the high-point lifting worktable.

[0025] The three height-increasing workbenches that are secured include: Based on the dimensions of the heat shield, three high-point lifting workbenches are hoisted and placed on the worktable of the chuck. The first screw is screwed into the foot hole of each high-point lifting workbench, and the first nut is screwed into the first screw.

[0026] Specifically, based on the dimensions of the heat shield, the hoisting method is determined. First, three high-point lifting platforms are installed, leaving openings for easy installation of the heat shield. After the heat shield is installed on the three high-point lifting platforms, a fourth high-point lifting platform is then installed to achieve the final installation and fixation of the heat shield.

[0027] Next, using hoisting equipment, the three elevated workbenches are smoothly lifted to their pre-determined corresponding positions on the chuck worktable. After each elevated workbench is in place, the operator screws the first threaded rod into the pre-positioned T-nut through the anchor holes at the bottom.

[0028] After the first screw is screwed into the T-nut to a certain depth, the operator manually screws the first nut into the threaded portion of the first screw that is exposed in the foot hole. This step aims to use manual pre-tightening force to initially fix the feet of the high-point riser table against the chuck table surface, laying the foundation for subsequent final secure tightening with tools. It also facilitates fine-tuning of the position of the high-point riser table before final locking.

[0029] S102: Install extended claws and jacks on the table surface of each of the aforementioned height-increasing workbenches; In this embodiment, installing extended claws on the table surface of each height-increasing workbench includes: placing a third nut in the T-shaped groove of the table surface of the height-increasing workbench, placing the extended claws on the table surface of the height-increasing workbench, and locking them to the third nut with a screw that passes through the third nut.

[0030] Specifically, after the initial fixing of the height-increasing worktable is completed, the extended clamps are installed. This process first requires placing T-nuts as third nuts in the T-slots on the surface of each height-increasing worktable. These T-nuts provide anchor points for subsequent tightening.

[0031] Next, place the extended claws one by one on the platform of each height-adjusting workbench and adjust them to the preset initial position. Then, use a screw to pass through the mounting hole on the extended claw and screw it down into the third nut that is already placed in the T-slot.

[0032] By rotating the screw, it fully engages with the third nut, thereby pulling the extended jaws downward and firmly fixing them to the surface of the elevated worktable. This connection method ensures the rigidity of the extended jaws when bearing machining loads, laying the foundation for stable clamping of the heat shield.

[0033] Continue by placing T-nuts in the T-slots on the three raised worktables, inserting screws into the T-nuts, and screwing three cylindrical head jacks onto one end of the screws, then tightening the cylindrical head jacks. The cylindrical head jacks can be adjusted when aligning the large flat end of the heat shield. By rotating the screws, the stroke of the screws into the T-nuts is adjusted, thereby allowing the cylindrical head jacks to move up and down.

[0034] S103: The heat shield is hoisted onto the high-point lifting worktable with its large flat end facing upwards, so that the straight cylindrical end face of the heat shield is perpendicular to the worktable of the vertical CNC lathe, and a specific plane of the heat shield is supported by the jack; wherein, the specific plane is the end face of the heat shield that mates with the diffuser. The heat shield is hoisted onto the elevated worktable with its large flat end facing upwards. Then, the outer end of the specific flat surface is placed against a jack, and the straight cylindrical end face of the heat shield is placed vertically on the worktable of the vertical CNC lathe. The specific flat surface is the end face E on the heat shield that mates with the diffuser (e.g.,...). Figure 2 (As shown).

[0035] This embodiment also includes: Multiple height-adjustable workbenches are used to fix the heat shield; After supporting a specific plane of the heat shield with a jack, the following is included: Place the height-increasing worktables on the chuck worktable in sequence, and fix the height-increasing worktables by connecting and fixing them with the corresponding anchor nuts and screws.

[0036] The operating steps for securing a hot surface using multiple elevated worktables are as follows: First, prepare and apply multiple elevated worktables according to the processing requirements. After initial support and alignment of the hot surface using adjustable jacks on a specific plane, the final securing of the elevated worktables begins.

[0037] The operator sequentially hoists and precisely places all the elevation risers (e.g., four in total) into their pre-planned positions on the chuck's worktable. Each elevation riser aligns its own anchor hole with the pre-installed anchor nuts in the T-slots of the chuck's worktable. Next, the anchor bolts are screwed down into the corresponding anchor nuts from the anchor holes of each elevation riser. Then, the anchor nuts are screwed into the threaded sections of the bolts protruding from the anchor holes. Using tools (such as socket wrenches), the operator tightens each anchor nut sequentially, securing the elevation risers firmly to the chuck's worktable through the tension of the bolts.

[0038] Furthermore, the high-point elevation workbench includes four components, which, after being supported by jacks on a specific plane of the heat shield, include: Place the fourth high-point elevation workbench on the chuck workbench and fix it in place by connecting and fixing the fourth high-point elevation workbench with the corresponding anchor nuts and screws. Connect and fix the remaining three height-increasing workbenches in sequence.

[0039] Specifically, after the heat shield is hoisted between the three pre-placed height-adjusting workbenches and supported on a specific plane by jacks, the following operations are performed: First, hoist the fourth height-adjusting workbench and place it in the pre-reserved installation position on the chuck worktable. Next, pass the corresponding anchor bolts through the anchor holes of the fourth height-adjusting workbench and screw them into the T-nuts in the T-slots of the chuck worktable below. Then, manually screw the anchor nuts into the bolts and initially tighten them. Finally, use a socket wrench to securely tighten the anchor bolts of the remaining three previously placed height-adjusting workbenches to ensure that all four height-adjusting workbenches are firmly connected and fixed to the chuck worktable.

[0040] This step-by-step fastening process ensures the rigidity and stability of the entire clamping base platform, providing a reliable guarantee for subsequent precise adjustment of the extended jaws and safe turning operations.

[0041] S104: The extended jaws are used to clamp the outer circle of the hot screen to complete the first direction clamping of the hot screen; In this embodiment, the extended jaws used to hold the outer circle of the heat shield include: Adjust the position of the extended jaws on the table of the height-increasing worktable, and place a buffer between the extended jaws and the hot screen until the extended jaws clamp the outer circle of the hot screen through the buffer.

[0042] Specifically, adjust the extended jaws on the platform of each height-increasing workbench to align them with the outer circle B of the heat shield (e.g., Figure 2 The predetermined clamping position is shown. To ensure uniform distribution of clamping force and prevent damage or scratches to the finished surface of the heat shield, a buffer (such as copper foil) is inserted between the clamping surface of each extended jaw and the outer circular surface of the heat shield. The buffer acts as a soft cushioning medium, effectively avoiding direct contact between the metal jaws and the workpiece surface.

[0043] Only after completing the position adjustment and protective measures can the initial clamping force be applied. This preparatory process lays the foundation for subsequent safe and reliable clamping.

[0044] At this point, the machining and clamping process in the mating end direction (i.e., the first direction) of the hot screen sealing chamber is completed.

[0045] S105: After machining multiple mating surfaces and inner diameter of the large flat end of the heat shield, the machined heat shield is lifted off the chuck worktable, and the high-point lifting worktable and the first nut are removed from the chuck worktable. Specifically, after machining the multiple mating surfaces and inner diameter of the large flat end of the heat shield, the hoisting equipment is used to smoothly hook the heat shield onto the appropriate lifting points. The heat shield is then slowly lifted off the chuck table and transported to a pre-set safe area. Using a lifting device and manual assistance, the heat shield is then turned over to ensure the straight cylindrical end face is facing upwards and the posture is stable. Next, tools are used to loosen the anchor bolts of the four high-point lifting platforms in sequence. Each high-point lifting platform is then lifted off the chuck table and properly placed. Finally, along the T-slot direction of the chuck table, the first and third nuts used to secure the high-point lifting platforms are removed one by one, i.e., the T-nuts are removed. The inside of the T-slot is then preliminarily cleaned to remove any residual impurities.

[0046] S106: Install a second nut in the groove of the chuck worktable, fix the equal height pad, and install the standard jaw into the groove of the chuck worktable; In this embodiment, the second nut is installed in the groove of the chuck worktable, and the fixing of the leveling pad includes: Place the second nut at the symmetrical point in the groove of the chuck worktable, insert the screw into the second nut, screw on the equal height pad and tighten.

[0047] Specifically, after completing the first direction of machining and cleaning, a new clamping base is prepared for the second direction of machining of the heat shield. The operator places four T-nuts as the second nuts at the symmetrical points of the T-slots on the chuck worktable.

[0048] Next, insert a screw into each of the pre-positioned second nuts. Then, screw the height-checked leveling blocks into the tops of their respective screws, and tighten the four 80mm high leveling blocks with a tool to ensure they stand firmly on the chuck worktable.

[0049] This series of operations creates a highly consistent reference plane, providing a stable and reliable support surface for the large flat end of the hot screen after subsequent flipping, which is a key prerequisite for ensuring the machining accuracy in the second direction.

[0050] In some embodiments, before suspending the heat shield into the standard jaws with the cylindrical end facing upward, the method further includes: detecting the height of the equalization blocks to ensure that the height of each equalization block is the same.

[0051] Before hoisting the flipped heat shield into the standard jaws, the operator needs to check the height of each leveling block already installed on the chuck table. Using precision measuring tools, such as a height gauge or dial indicator, measure the vertical distance from the top surface of each leveling block to the chuck table surface. By comparing the measurement data, confirm that the actual height of all leveling blocks is consistent. If any height deviation is found, fine-tune by tightening or loosening the screws under the blocks until all leveling blocks reach the same height value, thus ensuring that the large flat end of the heat shield receives uniform and level support.

[0052] S107: Hoist the heat shield into the standard jaw with the straight end facing upward, so that the large flat end of the heat shield is supported on the equal height pad, and place a jack between the chuck worktable and the large flat end. Specifically, operate the hoisting equipment, hook the pre-set matching lifting points of the heat shield, slowly lift and adjust the heat shield's posture to ensure that the straight cylindrical end of the heat shield is facing upwards and remains vertically stable. Slowly lift the heat shield to the top of the CNC vertical lathe chuck worktable, align it with the enclosed area of ​​the four standard jaws, and gradually lower the heat shield so that the large flat end of the heat shield lands smoothly on the qualified leveling block, ensuring that the end face is fully in contact with the upper surface of the leveling block, without any suspension or tilting.

[0053] Next, place the jack between the chuck worktable and the large flat end face, specifically including: Place the jack into the gap between the chuck worktable and the large flat surface of the heat shield.

[0054] Specifically, observe the gap distribution between the chuck worktable and the large flat end of the heat shield, select a cylindrical head jack of appropriate size, and place it evenly and symmetrically in the gap, ensuring that the base of the cylindrical head jack is in close contact with the chuck worktable and the top of the cylindrical head jack is in light contact with the large flat end of the heat shield. Then, initially tighten it to ensure that the cylindrical head jack is in a finely adjustable support state.

[0055] S108: The outer circle of the large flat end of the hot screen is clamped using the standard jaws to complete the second-direction clamping of the hot screen.

[0056] In this embodiment, using standard jaws to clamp the outer circle of the large flat end of the hot screen includes: adjusting the position of the standard jaws and placing a buffer between the standard jaws and the diffuser until the standard jaws clamp the outer circle of the large flat end of the hot screen.

[0057] Specifically, adjust the standard jaws on the raised worktables at each high point to align them with the predetermined clamping position on the outer circle B of the heat shield. To ensure uniform clamping force distribution and prevent damage or scratches to the finished surface of the heat shield, a buffer (such as copper foil) is inserted between the clamping surface of each standard jaw and the outer circle surface of the heat shield. The buffer, acting as a soft cushioning medium, effectively avoids direct contact between the metal jaws and the workpiece surface.

[0058] After completing the position adjustment and protective measures, clamping force is applied. This process lays the foundation for safe and reliable clamping in the future.

[0059] At this point, the machining and clamping process of the diffuser end direction (i.e., the second direction) of the heat shield is completed.

[0060] Please see Figures 2-4 This embodiment also provides a vertical turning clamping device, applied to the vertical turning clamping method of the above embodiment, including: a chuck worktable 1, a high-point lifting worktable 2, an extended jaw 3, a standard jaw 4, a height equalization block (not shown in the figure) and a jack 5. The high-point lifting worktable 2, the standard jaw 4 and the height equalization block are arranged on the chuck worktable 1, and the extended jaw 3 and the jack 5 are arranged on the high-point lifting worktable 2.

[0061] Specifically, the chuck's worktable 1 has a T-shaped groove for installing various fasteners and auxiliary tooling.

[0062] The high-point lifting worktable 2 is set on the chuck worktable surface 1 and is used to raise the clamping reference surface to accommodate the workpiece height. It is fixed in the T-slot of the chuck worktable surface 1 by anchor bolts and T-nuts.

[0063] The standard jaw 4 is also set on the chuck worktable 1 and is installed in the T-slot of the chuck worktable 1 by the T-nut and bolt at its bottom, for directly clamping the workpiece during machining in the second direction.

[0064] The equal-height pads are set on the chuck worktable 1 and fixed by the screws of the second nut screwed into the T-slot. They are all at the same height and are used to provide precise equal-height support for the large flat end of the workpiece after it is flipped over.

[0065] The extended chuck 3 is set on the high-point lifting worktable 2 and is locked and fixed by the third nut installed in the T-slot on the surface of the high-point lifting worktable 2 and the through screw, and is used to clamp the outer circle of the workpiece during the first direction of machining.

[0066] Jack 5 is set on the high-point lifting workbench 2, and its bottom screw is screwed into the nut installed in the T-slot of the high-point lifting workbench 2 to provide an adjustable side or bottom support point when aligning the workpiece.

[0067] It should be noted that the extended jaw 3 and the standard jaw 4 can adopt the same structural dimensions, that is, the extended jaw 3 and the standard jaw 4 can use the same component.

[0068] In this embodiment, please refer to Figure 5 It also includes: multiple buffers 6, which are respectively set on the extended jaws 3 and the standard jaws 4.

[0069] Specifically, the buffer 6 is made of copper, and its dimensions are adapted to the clamping surfaces of the extended jaw 3 and the standard jaw 4. The buffer 6 is fixed to the curved clamping surface of the extended jaw 3 by a fitting method, ensuring that the buffer 6 is fully fitted to the jaw clamping surface without wrinkles or displacement. The buffer 6 covers the entire contact area of ​​the extended jaw 3 clamping the outer circle of the heat shield. The buffer 6 is also fixed to the clamping surface of the standard jaw 4 by the same fitting method, ensuring that the buffer 6 is tightly attached to the jaw clamping surface and completely covers the contact area between the standard jaw 4 and the outer circle of the large flat end of the heat shield, achieving buffer protection during clamping.

[0070] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

[0071] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusivity.

[0072] The term "comprises" implies that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A vertical turning clamping method, applied to machining the thermal shield of a nuclear power plant main pump, characterized in that, include: Remove the jaws from the chuck of the vertical CNC lathe, insert the first nut into the groove of the worktable surface of the chuck, and tighten the three high-point raising worktables. Install extended claws and jacks on the platform of each of the aforementioned height-increasing workbenches; The heat shield is hoisted onto the height-increasing worktable with its flat end facing upwards, so that the straight end face of the heat shield is perpendicular to the worktable of the vertical CNC lathe, and a specific plane of the heat shield is supported by the jack; wherein, the specific plane is the end face of the heat shield that mates with the diffuser. The extended jaws are used to clamp the outer circle of the heat shield to complete the first-direction clamping of the heat shield; After machining multiple mating surfaces and inner diameter of the large flat end of the heat shield, the machined heat shield is lifted off the chuck worktable, and the high-point lifting worktable and the first nut are removed from the chuck worktable. Install a second nut in the groove of the chuck worktable, fix the equal height pad, and install the standard jaws into the groove of the chuck worktable; The heat shield is hoisted into the standard jaw with its cylindrical end facing upwards, so that the large flat end of the heat shield is supported on the level pad, and a jack is placed between the chuck worktable and the large flat end. The outer circle of the large flat end of the heat shield is clamped using the standard jaws to complete the second-direction clamping of the heat shield.

2. The vertical turning clamping method according to claim 1, characterized in that, The three height-adjusting workbench includes: Based on the external dimensions of the heat shield, three height-increasing workbenches are hoisted and placed on the worktable of the chuck. A first screw is screwed into the foot hole of each height-increasing workbench, and the first nut is screwed into the first screw.

3. The vertical turning clamping method according to claim 1, characterized in that, The installation of extended grippers on the platform of each of the height-increasing workbenches includes: A third nut is placed in the T-shaped groove on the table surface of the height-increasing workbench. The extended claw is placed on the table surface of the height-increasing workbench and locked and fixed to the third nut by a screw that passes through the third nut.

4. The vertical turning clamping method according to claim 1, characterized in that, The method further includes: The heat shield is fixed using multiple height-adjusting workbenches. After the specific plane of the heat shield is supported by the jack, the following is included: The height-increasing worktable is placed on the chuck worktable in sequence, and the height-increasing worktable is fixed by the corresponding foot nuts and screws.

5. The vertical turning clamping method according to claim 1, characterized in that, The method of using the extended claws to clamp the outer circle of the heat shield includes: Adjust the position of the extended claw on the table surface of the height-increasing workbench, and place a buffer between the extended claw and the heat screen until the extended claw clamps the outer circle of the heat screen.

6. The vertical turning clamping method according to claim 1, characterized in that, The step of installing the second nut in the groove of the chuck worktable and fixing the leveling block includes: The second nut is placed at a symmetrical point in the groove of the chuck worktable, and a screw is inserted into the second nut. The equal height pad is then screwed on and tightened.

7. The vertical turning clamping method according to claim 1, characterized in that, Before suspending the heat shield into the standard jaws with the cylindrical end facing upwards, the method further includes: detecting the height of the equal-height pads to ensure that the height of each equal-height pad is the same.

8. The vertical turning clamping method according to claim 1, characterized in that, The step of using the standard jaws to clamp the outer circle of the large flat end of the heat screen includes: adjusting the position of the standard jaws and placing a buffer between the standard jaws and the diffuser until the standard jaws clamp the outer circle of the large flat end of the heat screen.

9. A vertical turning clamping device, applied to the vertical turning clamping method as described in any one of claims 1-8, characterized in that, include: The chuck worktable, the high-point lifting worktable, the extended jaws, the standard jaws, the leveling blocks, and the jack are provided on the chuck worktable. The extended jaws and the jack are provided on the high-point lifting worktable.

10. The vertical turning clamping device according to claim 9, characterized in that, Also includes: Multiple buffers are respectively disposed on the extended jaw and the standard jaw.

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