Cladding tube large length-diameter ratio thin tube inner hole processing device

Abstract

This invention provides a device for machining the inner hole of a slender tube with a large length-to-diameter ratio, comprising a first lathe body connected in series with a second lathe body. A lathe spindle box is located at the end of the first lathe body, and clamping devices are located at both ends of the lathe spindle. Movable support frames and trays are provided on the guide rails of both the first and second lathe bodies. The movable support frames are positioned on both sides of the lathe spindle box, and the trays are located on one side of the movable support frames. An elastic bracket is located on the top of the tray of the first lathe body, and an ultrasonic spindle is located on the top of the elastic bracket. An elastic bracket is also located on the top of the tray of the second lathe body, and a rotating clamping sleeve is located on the elastic bracket. The workpiece passes through a slender tube fixing device, which passes through the spindle hole of the lathe spindle box and is fixed by the clamping devices. A tool holder device passes through the workpiece, with one end connected to the rotating clamping sleeve and the other end connected to the ultrasonic spindle. This invention improves the rigidity of the workpiece and the machining accuracy.

Description

Technical Field

[0001] This utility model relates to the field of cladding tube technology, and more specifically, to a device for machining the inner hole of a slender tube with a large length-to-diameter ratio. Background Technology

[0002] Composite cladding tubes possess excellent high-temperature resistance, corrosion resistance, radiation resistance, high toughness, high strength, chemical stability at high temperatures, and superior high-temperature mechanical properties, giving them significant advantages in ensuring reactor safety and efficiency. SIC / SIC composite cladding tubes are used to seal and protect against fuel leaks.

[0003] The internal bore machining equipment for cladding tubes with large length-to-diameter ratios is a core piece of equipment in cladding tube manufacturing. It is specifically designed to process the inside of the cladding tubes to meet the stringent requirements of nuclear reactors for fuel tube precision, surface quality, and reliability.

[0004] Existing processing technologies mainly employ ordinary CNC machine tools for grinding, which results in low processing efficiency when processing slender tubes with large length-to-diameter ratios. Furthermore, due to equipment precision issues, the workpieces suffer from poor dimensional consistency and surface quality, leading to cracks and easy breakage. The device proposed in this application can achieve a length-to-diameter ratio of 400:1. Moreover, the device can process various materials, such as zirconium tubes widely used in third-generation commercial pressurized water reactors and silicon carbide tubes used in fourth-generation advanced pressurized water reactors. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides an internal hole processing device for slender tubes with large length-to-diameter ratios that overcomes or at least partially solves the above technical problems.

[0006] This utility model is implemented as follows:

[0007] An internal bore machining device for slender tubes with a large length-to-diameter ratio, comprising a first lathe body and a second lathe body connected in series, wherein a lathe headstock is provided at the end of the first lathe body, and clamping devices are provided at both ends of the spindle of the lathe headstock.

[0008] The first lathe body and the second lathe body are both equipped with movable support frames and trays on their guide rails. The movable support frames are located on both sides of the lathe spindle box, and the trays are all located on one side of the movable support frames. The trays of the first lathe body are equipped with elastic brackets on top, and the elastic brackets are equipped with ultrasonic spindles on top.

[0009] The second lathe body has an elastic bracket on the top of the pallet, and a rotating clamping sleeve on the elastic bracket;

[0010] The workpiece passes through the slender tube fixing device, which passes through the spindle hole of the lathe spindle box and is fixed by a clamping device. The tool holder device passes through the workpiece and is connected at one end to the rotating clamping sleeve and at the other end to the ultrasonic spindle.

[0011] Preferably, the slender tube fixing device includes a fixed outer tube, which is provided with a plurality of adjusting bolts. The adjusting bolts are provided with adjustment observation holes on their sides, and the workpiece is provided inside the fixed outer tube.

[0012] Preferably, the tool holder device includes a tool holder, one end of which is fixedly connected to one end of the vibration isolation sleeve, the other end of which is connected to an extension rod, the extension rod being disposed inside a rotating clamping sleeve, and the other end of the tool holder being connected to an ultrasonic spindle.

[0013] Preferably, the fixed outer tube is provided with four adjusting bolts evenly distributed around its circumference.

[0014] Preferably, a compression pad is installed on the inner side of the adjusting bolt, and the compression pad is made of an elastic material.

[0015] The internal bore machining device for clad tubes with a large length-to-diameter ratio provided by this utility model has the following beneficial effects:

[0016] 1. The slender tube fixing device described in this application includes a fixed outer tube with multiple adjusting bolts on it. Each adjusting bolt has an adjustment observation hole on its side. A workpiece is placed inside the fixed outer tube. The workpiece is inserted into the fixed outer tube, and then the workpiece is adjusted by the adjusting bolts. The workpiece is then observed through the adjustment observation hole in conjunction with an optical measuring instrument or a mechanical measuring instrument to see if it is clamped, aligned, and straightened, and to ensure concentricity. All clamping processes can effectively enhance the rigidity of the workpiece, making it straight, concentric, and less prone to deformation.

[0017] 2. In this application, the adjusted slender tube fixing device is inserted into the lathe spindle box and fixed to the lathe spindle box by a clamping device. Since the lathe spindle box of this application is equipped with clamping devices at both ends, the stability of the slender tube fixing device is effectively increased.

[0018] 3. This application is equipped with a movable support frame, which effectively improves the rigidity of the tool holder device and the controllability during operation.

[0019] 4. The tool holder device described in this application includes a tool holder, one end of which is connected to an ultrasonic spindle. A vibration isolation sleeve is connected to the first node at the other end of the tool holder, and the other end of the vibration isolation sleeve is connected to an extension rod. The extension rod is located inside a rotating clamping sleeve. The cutting of the tool holder in this application is ultrasonic low-stress cutting, which can effectively reduce the cutting force and thus ensure cutting accuracy. The vibration isolation sleeve can effectively block the ultrasonic vibration of the tool holder, making the extension rod more stably placed inside the rotating clamping sleeve, so that the ultrasonic cutting is smooth. The tool holder, vibration isolation sleeve and extension rod are rigidly connected, and the force-bearing capacity is reliable.

[0020] 5. The pallet described in this application is equipped with an elastic bracket on the top. An ultrasonic spindle is provided on the top of one side of the elastic bracket, and a rotating clamping sleeve is provided on the other side of the elastic bracket. The workpiece passes through the slender tube fixing device, and the tool holder device passes through the workpiece and is connected to the ultrasonic spindle. By controlling the ultrasonic spindle, the ultrasonic spindle drives the tool holder device to move, thereby machining the inner hole of the workpiece. Due to the elastic bracket, the tool holder is always under tension, which improves the rigidity of the tool holder and enhances the cutting resistance and the deformation resistance of the tool holder.

[0021] 6. The structure of this application effectively improves the rigidity of the tool holder device and the controllability of its movement. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is an overall perspective view provided by an embodiment of the present utility model;

[0024] Figure 2 A schematic diagram of the cross-section structure provided for an embodiment of this utility model;

[0025] Figure 3 A three-dimensional structural diagram of the slender tube fixing device 2 provided for an embodiment of this utility model;

[0026] Figure 4 A schematic diagram of the cross-sectional structure of the slender tube fixing device 2 provided for an embodiment of this utility model;

[0027] Figure 5 Left view of the fixed outer tube 13 provided for an embodiment of this utility model.

[0028] In the figure: 1. First lathe body; 2. Slender tube fixing device; 3. Clamping device; 4. Lathe spindle box; 5. Movable support frame; 6. Support plate; 7. Elastic bracket; 8. Ultrasonic spindle; 11. Tool holder device; 13. Fixed outer tube; 14. Adjusting bolt; 15. Adjustment observation hole; 18. Tool holder; 19. Vibration isolation sleeve; 20. Extension rod; 21. Compression pad; 22. Rotary clamping sleeve; 23. Second lathe body. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0030] Reference Figures 1-5 The device for machining the inner hole of a slender tube with a large length-to-diameter ratio includes a first lathe body 1 and a second lathe body 23. The first lathe body 1 and the second lathe body 23 are connected in series. The first lathe body 1 is provided with a lathe spindle box 4 at its end. The lathe spindle box 4 is provided with clamping devices 3 at both ends of its spindle.

[0031] Specifically, the first lathe body 1 and the second lathe body 23 are both equipped with movable support frames 5 and pallets 6 on their guide rails. The movable support frames 5 are placed on both sides of the lathe spindle box 4 and are respectively set on the guide rails of the first lathe body 1 and the second lathe body 23. The first lathe body 1 is equipped with a pallet 6 on its guide rail and is placed on one side of the movable support frame 5. The top of the pallet 6 of the first lathe body 1 is equipped with an elastic bracket 7, and the top of the elastic bracket 7 is equipped with an ultrasonic spindle 8. Since the elastic bracket 7 is elastic, it can achieve a pre-tightening effect.

[0032] The second lathe body 23 has a tray 6 on its guide rail, which is located on one side of the movable support frame 5 and away from the first lathe body 1. The top of the tray 6 is provided with an elastic bracket 7, and the elastic bracket 7 is provided with a rotating clamping sleeve 22.

[0033] The workpiece passes through the slender tube fixing device 2, which passes through the spindle hole of the lathe spindle box 4 and is fixed by the clamping device 3. The tool holder device 11 passes through the workpiece and is connected at one end to the rotating clamping sleeve 22 and at the other end to the ultrasonic spindle 8.

[0034] The slender tube fixing device 2 includes a fixed outer tube 13, which is equipped with multiple adjusting bolts 14. The adjusting bolts 14 are provided with adjustment observation holes 15 on their sides. The workpiece is placed inside the fixed outer tube 13. Specifically, the workpiece is inserted into the fixed outer tube 13, and then the workpiece is clamped, straightened, and centered by adjusting the bolts 14. The workpiece is then observed through the adjustment observation holes 15 in conjunction with an optical measuring instrument or a mechanical measuring instrument to see if it is clamped, straightened, and centered. All clamping processes can effectively enhance the rigidity of the workpiece, making it straight, concentric, and less prone to deformation.

[0035] The lathe spindle box 4 of this application is equipped with clamping devices 3 at both ends, which effectively increases the stability of the slender tube fixing device 2.

[0036] This application features a movable support frame 5, which effectively improves the rigidity of the workpiece and the tool holder 18, as well as the controllability during operation.

[0037] This application is provided with an elastic support 7, which can keep the tool holder 18 under tension at all times, thereby improving the rigidity of the tool holder 18 and increasing the cutting tension and the deformation tension of the tool holder 18.

[0038] Specifically, the tool holder device 11 includes a tool holder 18, one end of which is fixedly connected to one end of a vibration isolation sleeve 19, the other end of which is connected to an extension rod 20, which is located inside a rotating clamping sleeve 22, and the other end of which is connected to an ultrasonic spindle 8. The tool holder 18 of this application performs ultrasonic low-stress cutting, which can effectively reduce cutting force and thus ensure cutting accuracy.

[0039] Specifically, the outer tube 13 is equipped with four adjusting bolts 14 evenly distributed around its circumference.

[0040] Specifically, a compression pad 21 is installed on the inner side of the adjusting bolt 14, and the compression pad 21 is made of elastic material; this allows the compression pad 21 to contact the surface of the workpiece, thereby preventing the adjusting bolt 14 from directly compressing the pipe and causing damage to the surface of the pipe.

[0041] Specifically, the working process or principle of the inner hole machining device for a slender tube with a large length-to-diameter ratio is as follows: During use, the workpiece is loaded into the fixed outer tube 13, fixed and aligned using adjusting bolts 14, and centered. The workpiece is then observed through the observation hole 15 to determine if it is clamped and centered. One end of the tool holder 18 passes through the inner hole of the workpiece and is connected to the ultrasonic spindle 8. The vibration isolation sleeve 19 is connected to the first node at the other end of the tool holder 18. The extension rod 20 is clamped by the rotating clamping sleeve 22. The movable support frame 5 is placed on both sides of the workpiece to support the lateral displacement of the tool holder 18. The CNC system of this application has 6 axes. The control system is connected to the X-axis and Z-axis motors of the pallet 6 of the first lathe body 1 and the X-axis motor of the movable support frame 5, and the X-axis and Z-axis motors of the pallet 6 of the second lathe body 23 and the X-axis motor of the movable support frame 5, and can be controlled synchronously. During operation, the rotating clamping sleeve 22 and the ultrasonic spindle 8 clamp the tool bar 18 respectively. When the CNC lathe is started, the rotating clamping sleeve 22 and the ultrasonic spindle 8 move synchronously left and right (i.e., along the Z-axis). When the tool is loaded, the CNC system controls the two pallets and the support frame to make synchronous equidistant movements on the X-axis, and combines the linear movement on the Z-axis with the rotation of the machine tool spindle to complete the cutting movement.

[0042] It should be noted that the first lathe body 1, the second lathe body 23, the lathe spindle box 4, and the ultrasonic spindle 8 are existing devices or equipment, or devices or equipment that can be implemented by existing technology. Their power supply, specific composition, and principle are clear to those skilled in the art, so they will not be described in detail.

Claims

1. An apparatus for machining the inner hole of a slender tube with a large length-to-diameter ratio, comprising a first lathe body (1) and a second lathe body (23), characterized in that, The first lathe body (1) is connected in series with the second lathe body (23). The first lathe body (1) is provided with a lathe spindle box (4) at the end. The spindle of the lathe spindle box (4) is provided with clamping devices (3) at both ends. The first lathe body (1) and the second lathe body (23) are provided with movable support frame (5) and pallet (6) on their guide rails. The movable support frame (5) is placed on both sides of the lathe spindle box (4), and the pallet (6) is set on one side of the movable support frame (5). The pallet (6) of the first lathe body (1) is provided with an elastic bracket (7) on top, and an ultrasonic spindle (8) is provided on top of the elastic bracket (7). The second lathe body (23) has an elastic bracket (7) on the top of the pallet (6), and a rotating clamping sleeve (22) is provided on the elastic bracket (7); The workpiece passes through the slender tube fixing device (2), which passes through the spindle hole of the lathe spindle box (4) and is fixed by the clamping device (3). The tool holder device (11) passes through the workpiece and is connected at one end to the rotating clamping sleeve (22) and at the other end to the ultrasonic spindle (8).

2. The apparatus for machining the inner hole of a slender tube with a large length-to-diameter ratio as described in claim 1, characterized in that, The slender tube fixing device (2) includes a fixed outer tube (13), which is provided with a plurality of adjusting bolts (14). The adjusting bolts (14) are provided with an adjustment observation hole (15) on their side. The fixed outer tube (13) contains a workpiece.

3. The internal bore machining apparatus for clad tubes with a large length-to-diameter ratio as described in claim 1, characterized in that, The tool holder device (11) includes a tool holder (18), one end of which is fixedly connected to one end of a vibration isolation sleeve (19), the other end of which is connected to an extension rod (20), the extension rod (20) is located inside a rotating clamping sleeve (22), and the other end of which is connected to an ultrasonic spindle (8).

4. The apparatus for machining the inner hole of a slender tube with a large length-to-diameter ratio as described in claim 2, characterized in that, The fixed outer tube (13) is provided with four adjusting bolts (14) evenly distributed around its circumference.

5. The apparatus for machining the inner hole of a slender tube with a large length-to-diameter ratio according to claim 2, characterized in that, An extrusion pad (21) is installed on the inner side of the adjusting bolt (14), and the extrusion pad (21) is made of elastic material.

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