Rotary cutting tool for finned tube aluminum base anticorrosion coating

Abstract

The utility model belongs to finned tube aluminium base anticorrosive layer processing technical field, the utility model discloses a kind of rotary cutting tools of finned tube aluminium base anticorrosive layer, tool body includes cutter barrel and threaded hole, cutter barrel is the hollow cylinder shape of left end opening right end closure, threaded hole is set in the right side center of cutter barrel;Core shaft is cooperatively installed in the center of cutter barrel;Sector opening one is set in the left end position of cutter barrel, sector opening two is set in the rear side corresponding position of sector opening one;The through hole of pre-cutting tool is fixedly installed through screw with mounting hole alignment;Arc opening is set in the front side camber of cutter barrel, and it is located in the right side of sector opening one;Adjustable tool pad is fixedly installed on the upper end surface of arc opening.The utility model has beneficial effects: 1, prevent the fall of aluminium base fin and base pipe, make aluminium base anticorrosive layer peel through.2, mutual transfer problem of finned tube between finned tube assembly welding site and lathe cutting station is saved, improve the cutting processing efficiency of fin and aluminium base anticorrosive layer of finned tube.

Description

Technical Field

[0001] This utility model belongs to the field of processing technology of aluminum-based anti-corrosion coating for finned tubes, and specifically relates to a rotary cutting tool for aluminum-based anti-corrosion coating of finned tubes. Background Technology

[0002] Finned tubes are the core component of air coolers. Their manufacturing process can be categorized into high-frequency welding, mechanical winding, hot extrusion, and cold rolling. For finned tubes with aluminum fins and carbon steel or stainless steel base tubes, cold rolling is suitable due to the excellent ductility of the aluminum substrate. The cold rolling process for manufacturing finned tubes involves: covering the base tube (carbon steel or stainless steel) with an aluminum tube; using a cold rolling mill, the aluminum tube is rolled into equidistant fins; and an aluminum-based anti-corrosion layer is formed at the root of the aluminum tube (the contact surface between the aluminum tube and the base tube), thus creating a finned tube where the fins and base tube are integrated.

[0003] The aluminum-based anti-corrosion coating for finned tubes is a novel anti-corrosion process applied to the contact surface between the finned tubes and the tube housing in an air cooler. This creates an aluminum-based anti-corrosion structure between the tube housing's tube holes and the finned tubes. The air cooler assembles and welds multiple sets of finned tubes into a tube housing. Before assembling and welding the finned tubes, the aluminum-based anti-corrosion coating at the root of the finned tube undergoes plastic deformation through expansion joints, filling the space between the base tube and the tube housing's tube holes and isolating the base tube from external corrosive media. Due to the assembly and welding process requirements between the finned tubes and the tube housing, the aluminum-based anti-corrosion coating at both ends of the finned tubes needs further processing. Excess (height) fins are cut off to create an aluminum-coated layer with a thickness of only 0.4mm to 0.8mm, matching the diameter of the tube housing's tube holes.

[0004] In existing technologies, the cutting and machining of finned tube fins is performed using a lathe. The main technical problems with this lathe-based cutting process are: 1. The lathe cuts off excess fins in a single operation, leaving an aluminum-based anti-corrosion layer that matches the diameter of the tube box opening. During this cutting process, the spacing between the fins generates continuous radial cutting vibrations, which can cause the aluminum-based fins to detach from the tube, resulting in the aluminum-based anti-corrosion layer peeling through, leading to a low yield rate in secondary cutting. 2. Further processing of the finned tube requires it to be cut on a lathe. This involves the transfer of the finned tube between the air cooler assembly and welding area and the lathe cutting station, further reducing the efficiency of further processing.

[0005] Based on the aforementioned deficiencies in the existing technology, the inventors developed a rotary cutting tool for aluminum-based anti-corrosion coatings of finned tubes, which can effectively solve the problems existing in the prior art. Utility Model Content

[0006] To address the aforementioned technical problems, this invention provides a rotary cutting tool for machining the aluminum-based anti-corrosion layer of finned tubes. Its simple structure and scientifically designed features significantly improve the yield rate of finned tube machining. This invention utilizes a dedicated cutting tool to achieve both pre-cutting and secondary cutting of finned tubes in a single operation, solving the problem of continuous cutting vibration caused by the one-time machining of the aluminum-based anti-corrosion layer on a lathe in existing technologies.

[0007] The technical solution adopted in this utility model is as follows: a special cutting tool for rotary cutting of aluminum-based anti-corrosion coating of finned tubes, including a tool body and a mandrel. The tool body includes a tool cylinder and a threaded hole. The tool cylinder is a hollow cylindrical shape with an open left end and a closed right end. The threaded hole is located at the center of the right side of the tool cylinder. The mandrel is fitted and installed at the center of the tool cylinder, and the left and right ends of the mandrel extend to the outside of the left and right ends of the tool cylinder. A first fan-shaped opening is located at the left end of the tool cylinder, and a second fan-shaped opening is located at the corresponding position behind the first fan-shaped opening. The upper and lower ends of the first and second fan-shaped openings are square planes. A mounting hole is located at the center of the square plane at one end of the first or second fan-shaped opening. The cutter is square in shape, with a through hole in the center of the pre-cutting blade. The through hole of the pre-cutting blade is aligned with the mounting hole and fixed in place by screws. An arc-shaped opening is located on the front arc surface of the blade barrel, to the right of the first fan-shaped opening. The upper part of the arc-shaped opening is a square end face, and the lower part is a strip shape of an arc surface. A screw hole is located in the middle of the right side of the upper end face of the arc-shaped opening, and a mounting threaded hole is located to the left of the screw hole. The screw hole and the mounting threaded hole are arranged horizontally in a left-right linear manner. An adjustable blade pad is fixedly installed on the upper end face of the arc-shaped opening, and a secondary cutter is fixedly installed to the left of the adjustable blade pad. The distance between the secondary cutter and the axis of the blade barrel can be adjusted by the adjustable blade pad.

[0008] The mandrel includes a guide shaft with a diameter equal to the inner diameter of the finned tube base tube, and a chamfer at the left end of the guide shaft. A connecting shaft is fixed to the right side of the guide shaft, with a diameter smaller than that of the guide shaft, and a step is formed at the connection between the right end of the guide shaft and the connecting shaft to position the guide shaft. An external thread is formed on the circumferential surface of the right side of the connecting shaft, and a drive shaft is fixed to the right end of the connecting shaft, with a triangular head at the right end of the drive shaft. The guide shaft, connecting shaft, and drive shaft are concentric.

[0009] The diameter of the cutter barrel is larger than the diameter of the guide shaft. The threads of the threaded hole and the external thread are clockwise threads, and the threaded hole and the external thread mesh with each other.

[0010] The triangular head is mounted on the power output shaft of the electric drill, and the electric drill transmits rotary cutting power to the drive shaft through the triangular head.

[0011] The through hole of the pre-cutting blade is aligned with the mounting hole and tightened with screws; there are two pre-cutting blades, one fixedly installed on the upper end face of the first fan-shaped opening and the other fixedly installed on the lower end face of the second fan-shaped opening.

[0012] The upper square end face of the arc-shaped opening is larger than the size of the adjustable blade pad, and the upper square end face of the arc-shaped opening has gaps on the left and right, and up and down, for the adjustable blade pad to adjust.

[0013] The adjustable blade pad includes a blade pad body, which is square in shape. A recessed step is formed on the left side of the blade pad body, and an adjustment groove is formed on the left and right sides of the blade pad body. The adjustment groove is elliptical in shape. A through hole is formed at the center of the recessed step.

[0014] The secondary cutter is square in shape. It is installed in the mounting threaded hole by aligning the hole in its center with the through hole in the recessed step and tightening it with screws.

[0015] The adjustment groove of the blade pad body is installed in the screw hole by screws. By adjusting the corresponding position of the adjustment groove and the screw hole, the distance between the blade pad body and the shaft center of the blade barrel can be adjusted.

[0016] The present invention relates to a rotary cutting method for an aluminum-based anti-corrosion coating on finned tubes:

[0017] Step 1: Fixing the finned tube: Fix the finned tube to the bracket, ensuring that the finned tube is in a horizontal position;

[0018] Step 2, Installation of the special cutting tool: Install the triangular head of the mandrel on the power output shaft of the electric drill, and use the electric drill to provide rotational cutting power to the drive shaft of the mandrel;

[0019] Step 3: Adjusting the position of the secondary cutter: Based on the cutting thickness of the aluminum-based anti-corrosion layer of the finned tube required by the process, adjust the corresponding position of the adjustment groove and screw hole of the adjustable cutter pad, tighten the screw to fix the position of the cutter pad body, and determine the axial distance between the secondary cutter and the cutter barrel; at the same time, keep a gap of 1~2 mm between the cutter pad body and the left and right sides of the upper square end face of the arc-shaped opening.

[0020] Step 4: Rotary cutting of the aluminum-based anti-corrosion layer of the finned tube: Insert the mandrel into the inner hole of the base tube of the finned tube, press the start switch of the electric drill, and make the power output shaft of the electric drill rotate counterclockwise. Through the triceps head, the drive shaft rotates counterclockwise. With the clockwise thread of the threaded hole of the cutter body meshing with the clockwise thread of the external thread, the cutter body and the mandrel rotate counterclockwise. At this time, the pre-cutting blades on the first and second fan-shaped openings rotate counterclockwise at high speed, pre-cutting away two-thirds of the fins of the finned tube. As the cutter body and the mandrel continue to rotate counterclockwise, the remaining one-third of the fin height and the aluminum-based anti-corrosion layer are cut to the thickness required by the process.

[0021] In step one, the finned tube is fixed to the bracket, ensuring it is horizontal. The main purpose of this arrangement is to keep the finned tube horizontal so that when the mandrel's guide shaft is inserted into the inner hole of the finned tube's base tube, the mandrel's guide shaft and the base tube remain concentric, thereby improving the cutting accuracy of the aluminum-based anti-corrosion layer on the finned tube.

[0022] In step three, based on the required cutting thickness of the aluminum-based anti-corrosion layer for the finned tube, the corresponding positions of the adjusting groove and screw hole of the adjustable blade pad are adjusted. The position of the blade pad body is then fixed by tightening screws to determine the axial distance between the secondary cutter and the blade cylinder. Simultaneously, a gap of 1-2 mm is maintained between the blade pad body and the upper square end face of the arc-shaped opening on both sides. The main purpose of this setting is to prevent interference between the secondary cutter and the upper sides of the arc-shaped opening when cutting the finned tube fins and the aluminum-based anti-corrosion layer.

[0023] In step four, the mandrel is inserted into the inner hole of the finned tube base tube. The start switch of the electric drill is pressed, causing the drill's power output shaft to rotate counter-clockwise. This rotation, via the triceps head, drives the drive shaft to rotate counter-clockwise. With the clockwise thread of the tool body's threaded hole engaging with the clockwise thread of the external thread, the tool body and mandrel rotate counter-clockwise. The main purpose of this setup is to utilize the counter-clockwise rotation of the drive shaft, and the engagement of the clockwise thread of the threaded hole with the clockwise thread of the external thread, to both securely connect the connecting shaft and the tool barrel, and simultaneously drive the guide shaft and tool barrel to rotate counter-clockwise, causing the pre-cutting blade and secondary cutting blade to rotate at high speed.

[0024] In step four, the pre-cutting blades on fan-shaped openings one and two rotate counterclockwise at high speed, pre-cutting away two-thirds of the fins of the finned tube. As the blade body and mandrel continue to rotate counterclockwise, the remaining one-third of the fin height and the aluminum-based anti-corrosion layer are cut to the required thickness. The main purpose of this setup is twofold: firstly, the high-speed rotation of the pre-cutting blades and secondary cutters allows for simultaneous pre-cutting and secondary cutting of the fins and aluminum-based anti-corrosion layer of the finned tube, effectively preventing vibration caused by continuous radial cutting, preventing the aluminum-based fins from detaching from the base tube, and ensuring thorough peeling of the aluminum-based anti-corrosion layer, thereby increasing the yield of the fins and aluminum-based anti-corrosion layer in further cutting processing; secondly, it eliminates the need for transfer between the finned tube assembly and welding site and the lathe cutting station, improving the efficiency of cutting the fins and aluminum-based anti-corrosion layer of the finned tube.

[0025] The beneficial effects of this utility model are as follows: By setting up the cutter body, mandrel, fan-shaped opening one, fan-shaped opening two, pre-cutting cutter and secondary cutting cutter, the mandrel is provided with rotational cutting power by a hand drill, causing the pre-cutting cutter and secondary cutting cutter to rotate at high speed; 1. It can realize the pre-cutting and secondary cutting of the fins and aluminum-based anti-corrosion layer of the finned tube at one time, effectively eliminating the vibration caused by continuous radial cutting, preventing the aluminum-based fins from falling off the base tube, and peeling through the aluminum-based anti-corrosion layer, thereby improving the yield of the fins and aluminum-based anti-corrosion layer of the finned tube for further cutting and processing. 2. It eliminates the problem of mutual transfer of finned tubes between the finned tube assembly and welding site and the lathe cutting station, improving the cutting and processing efficiency of the fins and aluminum-based anti-corrosion layer of the finned tube. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model;

[0027] Figure 2 This utility model Figure 1 Cross-sectional structural diagram;

[0028] Figure 3 This is a schematic diagram of the adjustable blade pad of this utility model;

[0029] Figure 4 This is a cross-sectional view of the present invention in use;

[0030] The markings in the diagram are as follows: 1. Blade body, 101. Blade barrel, 102. Threaded hole, 2. Mandrel, 21. Guide shaft, 22. Chamfer, 23. Connecting shaft, 24. External thread, 25. Drive shaft, 26. Triangular head, 3. Fan-shaped opening one, 4. Fan-shaped opening two, 5. Mounting hole, 6. Pre-cutting blade, 7. Arc-shaped opening, 8. Threaded hole, 9. Mounting threaded hole, 10. Adjustable blade pad, 1001. Blade pad body, 1002. Recessed step, 1003. Adjustment groove, 1004. Through hole, 11. Secondary cutting blade, 12. Finned tube, 121. Fin, 122. Aluminum-based anti-corrosion layer, 123. Base tube. Detailed Implementation

[0031] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0032] This utility model provides a rotary cutting tool for the anti-corrosion coating of aluminum-based finned tubes:

[0033] like Figure 1 As shown in Figure 2, this utility model provides a special cutting tool for rotary cutting of aluminum-based anti-corrosion coating of finned tubes. The tool body 1 includes a tool barrel 101 and a threaded hole 102. The tool barrel 101 is a hollow cylindrical shape with an open left end and a closed right end. The threaded hole 102 is located at the center of the right side of the tool barrel 101.

[0034] The aforementioned arrangement of the blade barrel 101 of the blade body 1 provides, on the one hand, a fixed mounting position for the pre-cutting blade 6 and the secondary cutting blade 11, defining their positions; on the other hand, it enables the pre-cutting action of the pre-cutting blade 6 and the secondary cutting action of the secondary cutting blade 11 to be performed simultaneously.

[0035] The hollow inner cylinder of the blade body 1 provides space for adjustment of the distance between the secondary cutter 11 and the axis of the blade cylinder 101, since the inner diameter of the blade cylinder 101 is larger than the diameter of the guide shaft 21 of the spindle 2. On the other hand, it provides installation space for guiding the cooperation between the guide shaft 21 of the spindle 2 and the inner hole of the base tube 123 of the finned tube 12.

[0036] The aforementioned threaded hole 102, through the meshing and tightening action of the external thread 24 on the surface of the connecting shaft 23 and the threaded hole 102, fixes the mandrel 2 and the tool barrel 101 into one unit. Under the rotation of the drive shaft 25, the tool barrel 101 is driven to rotate at high speed.

[0037] like Figure 1 As shown in Figure 2, the mandrel 2 is fitted and installed at the center of the cutter barrel 101, with both ends of the mandrel 2 extending to the outside of the left and right ends of the cutter barrel 101; the mandrel 2 includes a guide shaft 21, the diameter of which is equal to the inner diameter of the base tube 123 of the finned tube 12, and a chamfer 22 is provided at the left end of the guide shaft 21; a connecting shaft 23 is fixed to the right side of the guide shaft 21, the diameter of the connecting shaft 23 is smaller than the diameter of the guide shaft 21, and a step for positioning the guide shaft 21 is formed at the connection between the right end of the guide shaft 21 and the connecting shaft 23; an external thread 24 is provided on the circumferential surface of the right side of the connecting shaft 23, and a drive shaft 25 is fixedly provided at the right end of the connecting shaft 23, with a triangular head 26 provided at the right end of the drive shaft 25; the guide shaft 21, the connecting shaft 23, and the drive shaft 25 are concentric.

[0038] The aforementioned guide shaft 21, with a chamfer 22 at its left end, serves two main purposes: firstly, the chamfer 22 allows the guide shaft 21 to be smoothly inserted into the base tube 123 of the finned tube 12; secondly, the guide shaft 21 provides guidance for the cutter barrel 101 (pre-cutting blade 6 and secondary cutting blade 11). Furthermore, the guide shaft 21 provides a pivot point for the cutter barrel 101 during high-speed rotation, ensuring that the cutter barrel 101, pre-cutting blade 6, and secondary cutting blade 11 remain axially horizontal, thereby improving the cutting accuracy of the pre-cutting blade 6 and secondary cutting blade 11 on the fins 121 and the aluminum-based anti-corrosion layer 122.

[0039] The external thread 24 on the circumferential surface of the connecting shaft 23 is engaged with the threaded hole 102 for tightening. The external thread 24 and the internal thread of the threaded hole 102 are clockwise threads. When the drive shaft 25 drives the cutter body 1 to rotate counterclockwise, the external thread 24, the internal thread of the threaded hole 102 and the counterclockwise rotation of the cutter body 1 are engaged to fix the cutter barrel 101 and the connecting shaft 23 into one unit.

[0040] The aforementioned configuration of the drive shaft 25 and the triangular head 26 allows the triangular head 26 to be installed in conjunction with the mounting hole at the power output end of the electric drill. The rotational torque of the electric drill drives the drive shaft 25 to rotate at high speed, which in turn drives the cutter barrel 101, guide shaft 21, pre-cutting blade 6, and secondary cutting blade 11 to rotate at high speed.

[0041] like Figure 1 As shown, fan-shaped opening 3 is located at the left end of the blade cylinder 101, and fan-shaped opening 4 is located at the corresponding position behind fan-shaped opening 3. The upper and lower ends of fan-shaped opening 3 and fan-shaped opening 4 are square planes. Mounting hole 5 is located at the center of the square plane at one end of fan-shaped opening 3 or fan-shaped opening 4. Pre-cutting blade 6 is square in shape, and a through hole is provided in the center of pre-cutting blade 6. The through hole of pre-cutting blade 6 is aligned with mounting hole 5 for fixed installation. There are two pre-cutting blades 6, one fixedly installed on the upper end face of fan-shaped opening 3 and the other fixedly installed on the lower end face of fan-shaped opening 4.

[0042] The aforementioned fan-shaped opening 3 and fan-shaped opening 4 provide a fixed mounting position for the two pre-cutting blades 6. Under the high-speed rotation of the two pre-cutting blades 6 driven by the blade cylinder 101, on the one hand, the cutting efficiency of the finned tube 12 is improved, and on the other hand, the radial vibration caused by the continuous cutting of the fins 121 can be reduced in the radial direction, preventing the aluminum base fins 121 from falling off from the base tube 123 and allowing the aluminum base anti-corrosion layer 122 to be peeled through.

[0043] like Figure 1 , 2 As shown in Figure 3, the upper part of the arc-shaped opening 7 is a square end face, and the lower part is a strip shape with an arc surface; the screw hole 8 is opened at the middle position on the right side of the upper end face of the arc-shaped opening 7, and the mounting threaded hole 9 is opened at the left side of the screw hole 8. The screw hole 8 and the mounting threaded hole 9 are arranged horizontally in a left-right linear manner; the adjustable blade pad 10 is fixedly installed on the upper end face of the arc-shaped opening 7, and the secondary cutter 11 is fixedly installed at the left side of the adjustable blade pad 10. The distance between the secondary cutter 11 and the axis of the blade cylinder 101 can be adjusted through the adjustable blade pad 10.

[0044] The above-mentioned screw hole 8 and mounting threaded hole 9 are opened on the square end face of the upper part of the arc-shaped opening 7. The square end face of the upper part of the arc-shaped opening 7 provides a position for the fixed installation of the adjustable blade pad 10. At the same time, the screw hole 8 can be used to fix the secondary cutter 11 in the recessed step 1002 of the blade pad body 1001. The mounting threaded hole 9 is used to make a fine adjustment of the corresponding position of the adjustment groove 1003 on the blade pad body 1001 and the mounting threaded hole 9. This achieves the fine adjustment of the axial distance between the blade pad body 1001 and the blade cylinder 101, and finally achieves the fine adjustment of the axial distance between the secondary cutter 11 and the blade cylinder 101, that is, the fine adjustment of the cutting thickness of the aluminum-based anti-corrosion layer 122 of the finned tube 12.

[0045] like Figure 2 As shown, the size of the upper square end face of the arc-shaped opening 7 is larger than the size of the adjustable blade pad 10, and the upper square end face of the arc-shaped opening 7 has gaps reserved on the left and right and up and down for the adjustable blade pad 10 to adjust.

[0046] By finely adjusting the left and right gap of the adjustable blade pad 10 on the upper square end face of the arc-shaped opening 7, on the one hand, the relative distance between the pre-cutting blade 6 on the blade body 1 and the adjustable blade pad 10 can be controlled, thereby achieving fine adjustment of the cutting length of the aluminum-based anti-corrosion layer 122 on the finned tube 12; on the other hand, the relative distance between the adjustable blade pad 10 and the step at the connection between the guide shaft 21 and the connecting shaft 23 can be controlled, thereby achieving fine adjustment of the distance from the cutting end face of the aluminum-based anti-corrosion layer 122 to the end face of the base tube 123.

[0047] By finely adjusting the upper and lower gap of the adjustable blade pad 10 on the upper square end face of the arc-shaped opening 7, the cutting thickness of the aluminum-based anti-corrosion layer 122 can be controlled, thereby improving the cutting accuracy of the aluminum-based anti-corrosion layer 122 of the finned tube 12.

[0048] like Figure 3 As shown, the adjustable blade pad 10 includes a blade pad body 1001, which is square in shape. A recessed step 1002 is formed on the left side of the blade pad body 1001. An adjustment groove 1003 is formed on the left and right sides of the blade pad body 1001 and is elliptical in shape. A through hole 1004 is formed at the center of the recessed step 1002.

[0049] The recessed step 1002 provides a fixed mounting position for the secondary cutter 11 and also limits its movement.

[0050] The aforementioned adjustment groove 1003, with its elliptical structure, provides ample space for fine-tuning the position of the adjustable blade pad 10.

[0051] The through hole 1004 allows the secondary cutter 11 to be fixed in the recessed step 1002 on the cutter pad body 1001.

[0052] like Figure 1-4 As shown, the method of rotary cutting of the aluminum-based anti-corrosion layer of finned tubes using a special cutting tool according to this utility model is as follows:

[0053] Step 1: Fixing the finned tube: Fix the finned tube 12 to the bracket so that the finned tube 12 is in a horizontal position;

[0054] Step 2, Installation of the special cutting tool: Install the triangular head 26 of the mandrel 2 on the power output shaft end of the electric drill, and use the electric drill to provide rotational cutting power to the drive shaft 25 of the mandrel 2;

[0055] Step 3: Adjusting the position of the secondary cutter: Based on the cutting thickness of the aluminum-based anti-corrosion layer of the finned tube required by the process, adjust the corresponding position of the adjustment groove 1003 of the adjustable cutter pad 10 and the screw hole 8, and tighten the screw to fix the position of the cutter pad body 1001, and determine the axial distance between the secondary cutter 11 and the cutter cylinder 101; at the same time, keep a gap of 1~2 mm between the cutter pad body 1001 and the left and right sides of the upper square end face of the arc-shaped opening 7.

[0056] Step 4: Rotary cutting of the aluminum-based anti-corrosion layer of the finned tube: Insert the mandrel 2 into the inner hole of the base tube 123 of the finned tube 12, press the start switch of the electric drill, and make the power output shaft of the electric drill rotate counterclockwise. Through the triangular head 26, the drive shaft 25 rotates counterclockwise. With the clockwise thread of the threaded hole 102 of the cutter body 1 meshing with the clockwise thread of the external thread 24, the cutter body 1 and the mandrel 2 rotate counterclockwise. At this time, the pre-cutting blades 6 on the first fan-shaped opening 3 and the second fan-shaped opening 4 rotate counterclockwise at high speed, pre-cutting away two-thirds of the fins 121 of the finned tube 12. As the cutter body 1 and the mandrel 2 continue to rotate counterclockwise, the remaining one-third height of the fins 121 and the aluminum-based anti-corrosion layer 122 are cut to the thickness required by the process.

[0057] Based on the method of rotary cutting the aluminum-based anti-corrosion layer of finned tube using a special cutting tool, the triangular head 26 on the drive shaft 25 of the mandrel 2 can also be used for fixed connection with other special or self-made drive mechanisms, and the drive shaft 25 can be provided with rotational torque by using special or self-made drive mechanisms.

[0058] Various modifications to the above embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rotary cutting tool for an aluminum-based anti-corrosion coating of finned tubes, comprising a tool body and a mandrel, the tool body comprising a tool barrel and a threaded hole, the tool barrel being a hollow cylindrical shape with an open left end and a closed right end, the threaded hole being located at the center of the right side of the tool barrel; the mandrel being fitted and mounted at the center of the tool barrel, characterized in that: The mandrel extends to the outside of the left and right ends of the cutter barrel; a first fan-shaped opening is located at the left end of the cutter barrel, and a second fan-shaped opening is located at the corresponding position behind the first fan-shaped opening. The upper and lower ends of the first and second fan-shaped openings are square planes; a mounting hole is located at the center of the square plane at one end of the first or second fan-shaped opening; the pre-cutting blade is square in shape, with a through hole in its center. The through hole of the pre-cutting blade is aligned with the mounting hole and fixed in place by screws; an arc-shaped opening is located on the front arc surface of the cutter barrel, to the right of the first fan-shaped opening. The upper part of the arc-shaped opening is a square end face, and the lower part is a strip shape of an arc surface; a screw hole is located at the middle right side of the upper end face of the arc-shaped opening, and a mounting threaded hole is located to the left of the screw hole. The screw hole and the mounting threaded hole are arranged horizontally in a left-right linear manner; an adjustable blade pad is fixedly installed on the upper end face of the arc-shaped opening, and a secondary cutter is fixedly installed to the left of the adjustable blade pad. The distance between the secondary cutter and the axis of the cutter barrel can be adjusted through the adjustable blade pad.

2. The rotary cutting tool for the aluminum-based anti-corrosion coating of finned tubes according to claim 1, characterized in that: The mandrel includes a guide shaft with a diameter equal to the inner diameter of the finned tube base tube, and a chamfer at the left end of the guide shaft. A connecting shaft is fixed to the right side of the guide shaft, with a diameter smaller than that of the guide shaft, and a step is formed at the connection between the right end of the guide shaft and the connecting shaft to position the guide shaft. An external thread is formed on the circumferential surface of the right side of the connecting shaft, and a drive shaft is fixed to the right end of the connecting shaft, with a triangular head at the right end of the drive shaft. The guide shaft, connecting shaft, and drive shaft are concentric.

3. The rotary cutting tool for the aluminum-based anti-corrosion coating of finned tubes according to claim 1, characterized in that: The diameter of the cutter barrel is larger than the diameter of the guide shaft. The threads of the threaded hole and the external thread are clockwise threads, and the threaded hole and the external thread mesh with each other.

4. The rotary cutting tool for an aluminum-based anti-corrosion coating of finned tubes according to claim 1, characterized in that: The through hole of the pre-cutting blade is aligned with the mounting hole and tightened with screws; there are two pre-cutting blades, one fixedly installed on the upper end face of the first fan-shaped opening, and the other fixedly installed on the lower end face of the fan-shaped opening.

5. The rotary cutting tool for the aluminum-based anti-corrosion coating of finned tubes according to claim 1, characterized in that: The upper square end face of the arc-shaped opening is larger than the size of the adjustable blade pad. The upper square end face of the arc-shaped opening has gaps on the left and right, and up and down, for the adjustable blade pad to adjust.

6. The rotary cutting tool for an aluminum-based anti-corrosion coating of finned tubes according to claim 1, characterized in that: The adjustable blade pad includes a blade pad body, which is square in shape. A recessed step is formed on the left side of the blade pad body, and an adjustment groove is formed on the left and right sides of the blade pad body. The adjustment groove is elliptical in shape. A through hole is formed at the center of the recessed step.

7. The rotary cutting tool for the aluminum-based anti-corrosion coating of finned tubes according to claim 1, characterized in that: The secondary cutter is square in shape. It is installed in the mounting threaded hole by aligning the hole in its center with the through hole in the recessed step and tightening it with a screw.

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