Turning tool and turning method for outer circle of automobile water tank branch pipe

Abstract

The invention discloses an automobile water tank branch pipe outer circle turning tool and a turning method, and relates to the technical field of turning tool equipment. Comprising a connecting piece connected with a lathe, a fixing piece used for fixing the inner wall of the automobile water tank branch pipe is arranged on the connecting piece, and a releasing piece used for releasing limitation of the fixing piece is arranged on the fixing piece, so that the fixing piece does not rotate along with the connecting piece; according to the device, through two sets of symmetrical propelling threads with opposite thread directions, it is ensured that two sets of propelling rings synchronously move towards the inner side when a lathe rotates, symmetrical clamping of the two sides of a branch pipe is achieved, the eccentric problem caused by single-side clamping is avoided, and through four sets of evenly-distributed first connecting lugs, four sets of evenly-distributed fourth connecting lugs and corresponding first adjusting rods and second adjusting rods, the clamping precision is improved. And meanwhile, the rubber abutting blocks of the clamping blocks and the anti-skid rubber layers of the first clamping block and the second clamping block form flexible clamping from the inner side and the outer side, the branch pipe is prevented from slipping, and metal scratching is avoided.

Description

Technical Field

[0001] This invention relates to the field of turning tooling and equipment technology, specifically to a turning tooling and method for turning the outer diameter of an automotive water tank branch pipe. Background Technology

[0002] The radiator branch pipe is a key component in the automotive cooling system responsible for distributing coolant and enhancing heat dissipation efficiency. It typically refers to a branch pipe connecting the radiator main pipe to other cooling components. Branch pipes are usually made of metal or high-temperature resistant plastic, with one end connected to the radiator main pipe and the other end branching to other cooling components. The radiator branch pipe outer diameter turning fixture is a special fixture designed specifically for machining the outer diameter of the radiator branch pipe. Its core function is to achieve precise positioning and stable clamping of the branch pipe, ensuring that the dimensional accuracy and geometric tolerances during outer diameter turning meet the process requirements, while improving machining efficiency and operational safety. In the manufacturing process of the radiator branch pipe, the inner hole is usually bored first, and then the outer diameter is turned. The radiator branch pipe is mostly a thin-walled pipe and needs to be tightly fitted with components such as the radiator and engine through the inner hole. If the outer diameter is machined first, the outer diameter must be used as a reference for clamping during subsequent boring. However, the thin-walled outer diameter is prone to elliptical deformation under clamping force, resulting in the inner hole and outer diameter coaxiality exceeding the tolerance.

[0003] Chinese Patent Publication No. CN217370519U discloses a turning fixture for the outer diameter of a thin-walled cylindrical workpiece. This turning fixture is coaxially connected to a sliding top seat opposite to the three-axis chuck of a lathe. The fixture includes a rotary seat and a mandrel. The fixed end of the rotary seat is fixedly connected to the sliding top seat, and a rotating and positioning support is provided on the movable end of the rotary seat at the fixed end. The mandrel is axially fixed to the movable end of the rotary seat. A demolding unit, which extends radially out of the mandrel and supports the axial end face of the thin-walled cylindrical workpiece, is axially slidably connected inside the mandrel. This turning fixture provides radial support inside the thin-walled cylindrical workpiece, preventing the thin-walled cylinder from collapsing during cutting. It also features a simple structure and high positioning accuracy.

[0004] However, the above-mentioned existing technology has the following shortcomings: During use, the turning fixture only relies on the lathe's three-axis chuck to clamp one end of the workpiece on one side, and the mandrel only provides radial internal support. As a thin-walled pipe, the unilateral clamping force of the automotive radiator branch pipe is prone to cause eccentric deformation. After the outer diameter is turned, the form and position tolerances are out of tolerance, making it difficult to meet the precision matching requirements of the radiator and the engine. Furthermore, it only achieves workpiece positioning through the overall internal support of the mandrel. If there is a slight machining error in the inner hole of the automotive radiator branch pipe or a gap in the fit between the mandrel and the inner hole, the workpiece is prone to radial displacement on the mandrel, resulting in inaccurate centering and affecting the coaxiality of the outer diameter and the inner hole. Summary of the Invention

[0005] The purpose of this invention is to address the problem that, during use, the current turning fixture relies solely on the lathe's three-axis chuck to clamp the workpiece on one side, with the mandrel only providing radial internal support. As a thin-walled pipe, the automotive radiator branch pipe is prone to eccentric deformation due to the single-sided clamping force, resulting in excessive dimensional and positional tolerances after outer diameter turning, making it difficult to meet the precision fit requirements of the radiator and engine. Furthermore, since the workpiece positioning is achieved solely through the overall internal support of the mandrel, if there are slight machining errors in the inner hole of the automotive radiator branch pipe or a gap exists between the mandrel and the inner hole, the workpiece is prone to radial displacement on the mandrel, leading to inaccurate centering and affecting the coaxiality of the outer diameter and the inner hole. Therefore, this invention provides a turning fixture and method for the outer diameter of an automotive radiator branch pipe.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a turning fixture for the outer diameter of an automotive radiator branch pipe, comprising: a connector connected to a lathe, wherein the connector is provided with a fixing member for fixing the inner wall of the automotive radiator branch pipe, and the fixing member is provided with a release member for releasing the fixing member, so that the fixing member does not rotate with the connector; The fixing component includes a clamping block and a rotating ring rotatably connected to the connecting component. The outer circular surface of the fixing component is provided with a pushing thread, and the pushing thread is threaded to the outer side of the pushing thread to connect to the pushing ring. An adjusting rod one is provided between the pushing ring and the clamping block, and an adjusting rod two is provided between the rotating ring and the clamping block. The adjusting rod one and the adjusting rod two are arranged in a cross configuration. One end of the adjusting rod one is rotatably connected to a hinge post, and one end of the hinge post passes through the adjusting rod two. The adjusting rod one and the adjusting rod two are hinged together by the hinge post. When the lathe drives the connecting part to rotate around its axis, and the release part prevents the fixed part from rotating with it, the push thread drives the push ring to move towards the rotating ring, and the connecting ear one moves closer at the same time, driving the adjusting rod one to rotate with the hinge column. Because the adjusting rod one is hinged to the adjusting rod two, and the adjusting rod two is fixed below the clamping block through the connecting ear four, the angle between the adjusting rod one and the adjusting rod two is reduced, pushing the clamping block to move radially. The end of the adjusting rod two slides in the sliding groove, and finally abuts against the inner wall of the branch pipe to achieve centering and clamping.

[0007] As a further embodiment of the present invention: the connector includes a rotating shaft, one end face of which is fixedly connected with a threaded hole, and the other end face of the rotating shaft is provided with a stud adapted to the threaded hole.

[0008] As a further embodiment of the present invention: a connecting ear 1 is fixedly connected to the outer side of the propulsion ring, a connecting ear 2 is fixedly provided at the bottom end of the clamping block, an adjusting rod 1 is rotatably disposed between the connecting ear 1 and the connecting ear 2, a sliding groove is provided at the bottom end of the clamping block, a connecting ear 3 is slidably connected in the sliding groove, a connecting ear 4 is fixedly provided on the outer circular surface of the rotating ring, and an adjusting rod 2 is rotatably disposed between the connecting ear 3 and the connecting ear 4. Each set of rotating shafts is provided with two sets of rotating rings, propulsion threads and propulsion rings, and the two sets of rotating rings, propulsion threads and propulsion rings are symmetrically distributed, and the two sets of propulsion threads have opposite thread directions.

[0009] As a further embodiment of the present invention: the release component includes a first insertion hole formed on the outer circular surface of the rotating shaft, and a second insertion hole is formed through the outer circular surface of the rotating ring, and the first insertion hole and the second insertion hole are initially connected.

[0010] As a further embodiment of the present invention: a mounting frame is fixedly connected to the outer circular surface of the rotating ring, a push plate is slidably connected inside the mounting frame, an insertion rod is fixedly connected to the bottom end of the push plate, one end of the insertion rod passes through the mounting frame and is slidably inserted into insertion hole one and insertion hole two, a push spring is fixedly connected to the top end of the push plate, and one end of the push spring is fixedly connected to the top end inside the mounting frame.

[0011] As a further embodiment of the present invention: a guide groove 1 is provided at the bottom end of the push plate, and a guide groove 2 is provided at the bottom end of the inner side of the mounting frame, wherein the guide groove 1 and the guide groove 2 are symmetrically distributed.

[0012] As a further embodiment of the present invention: the release component further includes a top plate that is slidably inserted into the guide groove one and the guide groove two, a connecting hole one is provided at one end of the top plate, a connecting rod one is inserted into the connecting hole one, a support plate is fixedly connected to one end of the connecting rod one, and a connecting hole two is fixedly provided at one end of the support plate.

[0013] As a further embodiment of the present invention: an extension plate is provided at one end of the support plate, and a connecting rod and a connecting hole are also provided at both ends of the extension plate, and the connecting hole on the support plate and the connecting rod on the extension plate are inserted into each other.

[0014] As a further embodiment of the present invention: a connecting rod 2 is inserted into the connecting hole 2 on the extension plate, a fixing block 1 is fixedly connected to one end of the connecting rod 2, a telescopic rod 1 is fixedly connected to one end of the fixing block 1, a clamping block 1 is fixedly connected to the top end of the telescopic rod 1, a connecting hole 3 is opened at one end of the top plate, a connecting rod 3 is inserted into the connecting hole 3, a fixing block 2 is fixedly connected to one end of the connecting rod 3, a telescopic rod 2 is fixedly connected to one end of the fixing block 2, and a clamping block 2 is fixedly connected to one end of the telescopic rod 2.

[0015] A method for machining the outer diameter of an automotive radiator branch pipe includes the following steps: S1. First, select the connecting parts according to the length of the branch pipe to be processed. Assemble the matching support structure by using the studs of the rotating shaft and the threaded holes. Connect the connecting parts to the lathe spindle with a set of studs. Then, put the branch pipe coaxially on the clamping block of the fixing part and adjust it so that the inner wall of the branch pipe is in contact with the rubber abutment block of the clamping block to complete the loading. S2. After that, push the extension plate to drive the support plate and the top plate to slide. The top plate pushes the plate to make the insertion rod disengage from the insertion hole one, release the connection between the rotating ring and the rotating shaft, and install the fixing block one and the fixing block two. Pull the clamping blocks one and two to form a temporary clamp. Start the main shaft to make the fixing parts stop. Push the thread to drive the clamping block to center and clamp. Then remove the temporary components and reset the insertion rod. S3. Finally, restart the lathe spindle to drive the rotating shaft, fixed parts and branch pipe to rotate synchronously. After the speed stabilizes, start the turning tool and turn along the outer circle of the branch pipe according to the preset parameters until the outer circle of the branch pipe is completed.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, the I-shaped cross-section design of the rotating ring in the fixing component not only achieves stable rotational engagement with the rotating shaft, but also restricts axial movement through the annular protrusion, avoiding machining deviations caused by the displacement of the fixing component during high-speed rotation. With the cooperation of two sets of symmetrical and oppositely oriented push threads, it is ensured that the two sets of push rings move inward synchronously when the lathe rotates, achieving symmetrical clamping on both sides of the branch pipe and avoiding the eccentricity problem caused by single-sided clamping. In addition, four sets of evenly distributed connecting lugs one and four, and corresponding adjusting rods one and two, ensure that the radial movement of the four sets of clamping blocks is synchronous and the force is uniform, ensuring centering accuracy. At the same time, the rubber abutment block of the clamping block and the anti-slip rubber layer of clamping block one and clamping block two form a flexible clamping from the inside and outside, which not only prevents the branch pipe from slipping, but also avoids metal scratches, ensuring that the surface roughness of the branch pipe meets the process requirements. 2. In this invention, the threaded hole and stud design of the rotating shaft in the connector allows for flexible splicing of multiple sets of connectors according to the length of the branch pipe, eliminating the need for separate tooling design for branch pipes of different lengths, thus improving length adaptability. The eight sets of insertion holes 1 and 2 on the same cross section of the rotating shaft in the connector enable multi-angle positioning of the fixing component, allowing for position adjustment as needed, enhancing usability. The plug-in connection between the support plate and the extension plate allows for adjustment of the component length according to the length of the rotating shaft, adapting to different lathe specifications. In addition, the telescopic stroke of telescopic rod 1 and telescopic rod 2 can cover branch pipes of different diameters, allowing compatibility with multiple specifications of branch pipes without replacing core components, significantly reducing adaptation costs and changeover time. 3. In this invention, the pre-compression design of the push spring in the release component automatically provides downward elastic force to the push plate, ensuring that the insertion rod is stably inserted into the insertion hole in the initial state, eliminating the need for manual pressing and positioning, thus simplifying the operation process. The triangular arc surface design of the top plate converts the axial force of pushing the extension plate into the upward pushing force of the push plate, which saves effort and avoids wear on the bottom end of the push plate, extending the service life of the components. The arc-shaped gripping edges of clamping blocks one and two and the knurled treatment of the inner rod of the telescopic rod reduce the difficulty of applying force in manual operation and prevent hand slippage. At the same time, the tight fit between the T-shaped sliding groove and the connecting ear three provides precise guidance for the clamping blocks, avoids clamping position deviation, ensures processing stability, and reduces the scrap rate. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the fixed state of the fastener in this invention; Figure 3 This is a schematic diagram of the fastener structure in this invention; Figure 4 This is a cross-sectional view of the connector in this invention; Figure 5 This is a schematic diagram of the mounting frame in this invention; Figure 6 In this invention Figure 5 A schematic diagram of the structure at point A; Figure 7 This is a cross-sectional view of the rotating ring in this invention; Figure 8 This is a schematic diagram of the support plate in this invention; Figure 9 This is a schematic diagram of the release component in this invention; Figure 10 In this invention Figure 9 A schematic diagram of the structure at point B; Figure 11 In this invention Figure 9 A schematic diagram of the structure at point C.

[0018] In the diagram: 1. Connector; 11. Rotating shaft; 12. Threaded hole; 13. Stud; 2. Fixing component; 21. Rotating ring; 22. Push thread; 23. Push ring; 24. Connecting lug 1; 25. Adjusting rod 1; 26. Connecting lug 2; 27. Clamping block; 28. Sliding groove; 29. ​​Connecting lug 3; 210. Adjusting rod 2; 211. Connecting lug 4; 212. Hinge post; 3. Release component; 31. Insertion hole 1; 32. Insertion hole 2; 33. Mounting frame; 34. Push 35. Plate; 36. Insert rod; 37. Push spring; 38. Guide groove one; 39. Guide groove two; 30. Top plate; 310. Connecting hole one; 311. Connecting rod one; 312. Support plate; 313. Connecting hole two; 314. Extension plate; 315. Connecting rod two; 316. Fixing block one; 317. Telescopic rod one; 318. Clamping block one; 319. Connecting hole three; 320. Connecting rod three; 321. Fixing block two; 322. Telescopic rod two; 323. Clamping block two. Detailed Implementation

[0019] 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 embodiments of the present invention, and not all embodiments. 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.

[0020] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0021] Reference Figures 1 to 3 In this embodiment of the invention, a machining fixture and machining method for the outer diameter of an automotive radiator branch pipe are provided, including: a connecting member 1 connected to a lathe, a fixing member 2 for fixing the inner wall of the automotive radiator branch pipe on the connecting member 1, and a releasing member 3 for releasing the fixing member 2 so that the fixing member 2 does not rotate with the connecting member 1. The connecting member 1 includes a rotating shaft 11, a threaded hole 12 is fixedly connected to one end face of the rotating shaft 11, and a stud 13 adapted to the threaded hole 12 is opened on the other end face of the rotating shaft 11. Multiple sets of connecting members 1 are provided, adapted to the length of the automotive radiator branch pipe, and adjacent sets of connecting members 1 are threadedly connected by the threaded hole 12 and the stud 13.

[0022] Reference Figures 3 to 4The fixing component 2 includes a rotating ring 21 rotatably connected to the connecting component 1. The rotating ring 21 has an I-shaped cross-section. This structure not only restricts axial movement during rotation through the annular protrusion, but also increases the contact area with the connecting component 1 to improve rotational stability and prevent wobbling during high-speed rotation. The outer surface of the fixing component 2 is machined with a push thread 22. The push thread 22 adopts a trapezoidal tooth structure, and the thread surface is hardened to enhance wear resistance. The outer side of the push thread 22 is threaded to the push ring 23. Each set of rotating shafts 11 is equipped with two sets of rotating rings 21, push threads 22, and push rings 23, and the two sets of components are symmetrically distributed. One set of push threads 22 is right-handed, and the other set is left-handed, ensuring that the two sets of push rings 23 can synchronously move towards the rotating ring 21 during subsequent actions. The moving, propelling ring 23 is a ring structure with four sets of connecting ears 24 fixedly connected to its outer side. These four sets of connecting ears 24 are evenly distributed along the circumference of the propelling ring 23. Each set of connecting ears 24 is rotatably connected to an adjusting rod 25. Each connecting ear 24 is made of alloy steel plate with through holes, forming a rotatable fit with the pin at the end of the adjusting rod 25. The adjusting rod 25 has a U-shaped structure; its hollow design reduces weight while ensuring structural rigidity and preventing deformation under stress. The end of each adjusting rod 25 furthest from the connecting ear 24 is rotatably connected to a second connecting ear 26 via a pin. The top of the second connecting ear 26 is fixedly connected to a clamping block 27. The clamping block 27 is a rectangular aluminum alloy piece with a semi-circular rubber abutment block adhered to its top, which... To increase friction with the inner wall of the branch pipe and prevent slippage, while also avoiding metal scratches on the branch pipe, a T-shaped sliding groove 28 is provided at the bottom of the clamping block 27. A T-shaped connecting ear 29 is slidably connected within the sliding groove 28. The clearance between the two ensures smooth sliding without jamming or radial movement. The connecting ear 29 is rotatably connected to the adjusting rod 210 via a pin. The adjusting rod 210 has the same structure as the adjusting rod 25. The end of the adjusting rod 210 furthest from the connecting ear 29 is rotatably connected to the connecting ear 211 via a pin. The connecting ear 211 is fixed to the outer surface of the rotating ring 21, and four sets of connecting ears 211 are evenly distributed on the outer surface of each set of rotating rings 21, corresponding one-to-one with the connecting ear 24. A hinge post 212 is rotatably connected near the center of the adjusting rod 25. Column 212 is a stainless steel pin with retaining ring grooves at both ends. One end passes through adjusting rod 210 and is fixed by retaining ring, ensuring that the hinge between adjusting rod 25 and adjusting rod 210 rotates flexibly and will not disengage. When the operator coaxially places the automotive water tank branch pipe to be processed on the outside of the two sets of symmetrical clamping blocks 27, ensuring that the top end of the branch pipe initially fits against the rubber abutment block of a set of clamping blocks 27, the lathe spindle is started. When the lathe spindle drives the connecting piece 1 to rotate clockwise around its axis, the operating release piece 3 keeps the fixing piece 2 stationary and does not rotate with the connecting piece 1. At this time, the two sets of push threads 22 on the connecting piece 1 rotate with the connecting piece 1. Due to the thread meshing action, the two sets of push rings 23 move synchronously towards the corresponding set of rotating rings 21. When the push rings 23 move...The four sets of connecting ears 24 on the outer side move synchronously closer to the rotating ring 21, thereby driving the adjusting rod 25 on each set of connecting ears 24 to rotate around the hinge post 212. When the adjusting rod 25 rotates, since the adjusting rod 25 and the adjusting rod 210 are hinged through the hinge post 212, and the other end of the adjusting rod 210 is fixed to the rotating ring 21 through the connecting ear 211, the rotation of the adjusting rod 25 forces the adjusting rod 210 to rotate synchronously, and the angle between the two gradually decreases. When the angle between the adjusting rod 25 and the adjusting rod 210 decreases, the adjustment rod 25 rotates synchronously. During shrinkage, adjusting rod 25 pushes clamping block 27 radially away from the axis of connector 1 via connecting lug 26. Simultaneously, connecting lug 29 slides smoothly in the T-shaped sliding groove 28 at the bottom of clamping block 27 in a direction away from hinge post 212, providing precise guidance for clamping block 27. When the rubber abutment block at the top of clamping block 27 is in tight contact with the inner wall of the branch pipe, and the lathe spindle load reaches the preset value, the movement of the feed ring 23 stops, completing the centering and clamping of the branch pipe. At this point, the turning tool can be started to machine the outer diameter of the branch pipe.

[0023] The above scheme is adopted: the I-shaped cross-section design of the rotating ring 21 achieves stable rotational engagement with the connecting part 1 and restricts axial movement, improving the overall rotational stability of the device and avoiding excessive error in the outer diameter of the branch pipe due to movement during machining. Two sets of symmetrically distributed, oppositely oriented push threads 22 ensure that the two sets of push rings 23 move synchronously inward when the lathe rotates, achieving symmetrical clamping on both sides of the branch pipe and avoiding eccentricity caused by clamping on one side. Four sets of evenly distributed connecting lugs 24, 211, and corresponding adjusting rods 25 are used. Adjusting rod 210 synchronizes the radial movement of the four sets of clamping blocks 27 and ensures uniform force distribution, guaranteeing the centering accuracy of the branch pipe and meeting the form and position tolerance requirements for subsequent external turning. The semi-circular rubber abutment block at the top of the clamping block 27 increases the friction with the inner wall of the branch pipe to prevent slippage during processing and avoids direct metal contact that could scratch the inner wall of the branch pipe, thus protecting the surface quality of the branch pipe. The tight fit between the T-shaped sliding groove 28 and the T-shaped connecting ear 29 provides precise guidance for the radial movement of the clamping block 27, preventing the clamping block 27 from shifting and ensuring the accuracy of the clamping position.

[0024] Reference Figures 5 to 9The release component 3 includes a first insertion hole 31 formed on the outer circular surface of the rotating shaft 11. The first insertion hole 31 is a cylindrical hole, perpendicular to the axis of the rotating shaft 11 and penetrating through the outer circular surface of the rotating shaft 11. A second insertion hole 32 is formed through the outer circular surface of the rotating ring 21. The diameter of the second insertion hole 32 is the same as that of the first insertion hole 31, and the depth is the same as the wall thickness of the rotating ring 21. Eight sets of first insertion holes 31 and eight sets of second insertion holes 32 are evenly arranged at the same horizontal section of the rotating shaft 11. A mounting frame 33 is welded and fixed to the outer circular surface of the rotating ring 21. The mounting frame 33 has a U-shaped structure, and there are four sets of mounting frames 33, which are evenly distributed along the outer circular surface of the rotating ring 21. A set of push plates 34 is slidably connected inside each set of mounting frames 33. The push plates 34 have a cuboid structure and are coated with polytetrafluoroethylene to reduce sliding friction. A push plate 34 has a push rod 35 welded and fixed at the center of its bottom end. One end of the push rod 35 passes through the bottom end of the mounting frame 33 and can form a clearance fit with the first insertion hole 31 and the second insertion hole 32 to ensure a stable insertion and easy insertion and removal. In the initial state, the first insertion hole 31 and the second insertion hole 32 are fully aligned and connected to ensure that the push rod 35 can be inserted smoothly. Two sets of push springs 36 are symmetrically fixed to the top of each push plate 34. The push springs 36 are cylindrical helical compression springs. In the initial state, they are pre-compressed to provide a continuous downward elastic force to ensure that the push rod 35 is stably inserted into the insertion hole. The end of the push spring 36 away from the push plate 34 is welded and fixed to the top of the inside of the mounting frame 33. Two sets of guide grooves 37 are symmetrically opened at the bottom end of the push plate 34, and two sets of guide grooves 37 are correspondingly opened at the bottom of the inside of the mounting frame 33. The guide groove 38, guide groove 37, and guide groove 38 are all rectangular grooves. When aligned, they form a complete guide channel. The release component 3 also includes a top plate 39 that slides into guide groove 37 and guide groove 38. The top plate 39 has a triangular structure with an arc-shaped top and a width consistent with the width of the guide groove, allowing it to slide smoothly along the guide groove. A connecting hole 310 is provided at the end of the top plate 39 away from the arc-shaped surface. A connecting rod 311 is interference-fitted into the connecting hole 310. A support plate 312 is welded and fixed at the end of the connecting rod 311 away from the top plate 39. The support plate 312 is a rectangular steel plate. A connecting hole 313 is provided at one end of the support plate 312. An extension plate 314 is provided at one end of the support plate 312. The extension plate 314 and the support plate 312 are connected together. The structure is consistent, with connecting rod 311 welded to both ends and connecting hole 313. The connecting hole 313 of the support plate 312 and the connecting rod 311 of the extension plate 314 can be interlocked, enabling quick splicing of the support plate 312 and the extension plate 314. It is compatible with rotating shafts 11 of different lengths. The length of the support plate 312 after connecting with the top plate 39 is the same as the length of the rotating shaft 11. The length of the extension plate 314 is the same as the length of the support plate 312 after connecting with the top plate 39. When the device is in the initial fixed state, the preload of the push spring 36 pushes the push plate 34 downward, so that the insertion rod 35 passes through the mounting frame 33 and is inserted into the insertion hole 31 and the insertion hole 32. At this time, the fixing part 2 and the rotating shaft 11 are fixed by the insertion rod 35 and cannot rotate relative to each other.When it is necessary to disconnect the fastener 2 from the rotating shaft 11 to initiate the clamping action, the operator pushes the extension plate 314 along the axis of the rotating shaft 11, causing the support plate 312, which is inserted into the extension plate 314, to move synchronously. The support plate 312 pushes the top plate 39 to slide along the guide groove 37 and the guide groove 38 through the connecting rod 311. When the arc end of the top plate 39 contacts the bottom end of the push plate 34, as the top plate 39 continues to slide, the arc surface generates an upward pushing force, which overcomes the elastic force of the push spring 36 and pushes the push plate 34 upward. The push plate 34 drives the insertion rod 35. The rod rises synchronously until it is completely disengaged from the first insertion hole 31, remaining only in the second insertion hole 32. At this point, the connection between the fixing component 2 and the rotating shaft 11 is released. When the branch pipe processing is completed and it needs to be restored to its original position, the operator pulls the extension plate 314 until the extension plate 314, support plate 312, and top plate 39 are pulled out of the guide groove, allowing the push spring 36 to return to its original length. Under the action of the spring force of the push spring 36, the rod 35 is pushed back into the first insertion hole 31 and the second insertion hole 32, restoring the fixing component 2 and the rotating shaft 11 to their fixed state, facilitating the overall disassembly or adjustment of the device.

[0025] The above scheme achieves multi-angle positioning of the fixing component 2 in the circumferential direction of the rotating shaft 11 by uniformly distributing eight sets of insertion holes 31 and eight sets of insertion holes 32 at the same horizontal cross section. This allows for adjustment of the fixing position according to the branch pipe processing requirements, improving the versatility of the device. The pre-compression design of the push spring 36 automatically provides downward elastic force to the push plate 34, ensuring stable insertion of the insertion rod 35 into the insertion hole without manual pressing, thus improving operational convenience. The guide groove 37 at the bottom of the push plate 34 and the guide groove 38 of the mounting frame 33 further enhance the stability of the device. The top plate 39 is precisely guided to slide, preventing it from shifting and causing uneven force on the push plate 34, thus ensuring smooth insertion and removal of the insertion rod 35. The triangular arc surface design of the top plate 39 converts the axial force of the operator pushing the extension plate 314 into the upward pushing force of the push plate 34, saving effort and preventing damage to the bottom of the push plate 34, thus extending the service life of the components. The plug-in connection between the support plate 312 and the extension plate 314 allows for flexible splicing according to the length of the rotating shaft 11, adapting to different specifications of lathe connecting parts 1, and reducing the adaptation cost of the device.

[0026] Reference Figures 9 to 11In the connecting hole 313 at the end of the extension plate 314 away from the support plate 312, a connecting rod 315 is inserted with a clearance fit. At the end away from the connecting hole 313, a fixing block 316 is fixedly connected by arc welding. A telescopic rod 317 is welded and fixed to the center of one end of the fixing block 316. The telescopic rod 317 is a spring-loaded telescopic rod, consisting of an outer cylinder and multiple sets of nested inner cylinders. The inner cylinders can slide axially along the outer cylinder and contain a built-in compression spring. Initially, the compression spring is in a pre-compressed state, and the inner rod is fully retracted into the outer cylinder. A clamping block 318 is welded and fixed to the top of the telescopic rod 317. The clamping block 318 has an arc-shaped structure, using a metal core wrapped with a thick nitrile rubber layer. The surface of the rubber layer has diamond-shaped anti-slip textures, and the outer side also has an arc-shaped grip. For easy manual application of force, the top plate 39 has a connecting hole 319 at the end away from the connecting rod 311. A connecting rod 320 is inserted into the connecting hole 319 with the same clearance. The structure and material are completely the same as the connecting rod 315. A fixing block 321 is welded to one end of the connecting rod 320. One end of the fixing block 321 is welded to the telescopic rod 322. The telescopic rod 322 has the same specifications as the telescopic rod 317. A clamping block 323 is welded to one end of the telescopic rod 322. The clamping block 323 has the same structure as the clamping block 318 and is symmetrically arranged. Four sets of fixing blocks 316, telescopic rod 317, clamping blocks 318, fixing blocks 321, telescopic rod 322, and clamping blocks 323 are arranged along the end face of the rotating shaft 11. The components are evenly distributed circumferentially. When preparing to fix the branch pipe of the car water tank before external turning, the operator first coaxially sleeves the branch pipe to be processed on the outside of the fixing part 2. Then, the end bosses of the extension plate 314, support plate 312 and top plate 39 are aligned with the guide groove 1 37 and guide groove 2 38 and slowly inserted until the top plate 39 pushes the push plate 34 upward, the insertion rod 35 completely disengages from the insertion hole 1 31, and the connection between the rotating ring 21 and the rotating shaft 11 is officially released. At this time, the fixing block 1 316 is inserted into the connection hole 2 313 of the extension plate 314 through the connecting rod 2 315, and at the same time, the fixing block 2 321 is inserted into the connection hole 3 319 of the top plate 39 through the connecting rod 3 320, ensuring that the two sets of connections are not loose. Then, the operator holds the clamping block 1 318 with his fingers. When the gripping edge of clamping block 323 is manually pulled away from the center of rotating shaft 11, the contraction springs inside telescopic rod 317 and telescopic rod 322 gradually release their elastic potential energy, and the inner cylinder extends along the outer cylinder until the rubber layer on the inner side of clamping block 318 and clamping block 323 is completely in contact with the outer surface of the branch pipe, forming a stable temporary clamp. When the lathe drives rotating shaft 11 to rotate around its axis, due to the static friction between clamping block 318, clamping block 323 and the outer circle of the branch pipe, and because the extension plate 314 and top plate 39 are limited by the guide groove and cannot rotate, the fixing part 2 remains stationary with the branch pipe. The push thread 22 on the connecting part 1 rotates with rotating shaft 11, driving the push ring 23 to move towards rotating ring 21. Finally, the clamping block 27 is pushed by the adjusting plate assembly to clamp the inner wall of the branch pipe.After the outer diameter of the branch pipe is machined, the operator pushes clamping blocks 318 and 323 in the reverse direction, causing telescopic rods 317 and 322 to retract and reset. Then, the extension plate 314, support plate 312, and top plate 39 are pulled out, allowing the machined branch pipe to be removed.

[0027] The above scheme employs four sets of evenly distributed and symmetrical clamping blocks 318 and 323 to ensure uniform force distribution on the outer surface of the branch pipe, preventing deformation caused by unilateral clamping and guaranteeing the coaxiality accuracy of subsequent inner hole clamping. The nitrile rubber layer with anti-slip texture on the inner side of the clamping blocks increases the friction with the outer circle of the branch pipe, preventing slippage during temporary clamping and avoiding direct metal contact that could scratch the outer circle of the branch pipe. The knurled treatment of the arc-shaped gripping edge on the outer side of the clamping blocks and the inner rod of the telescopic rod reduces the difficulty of manually pulling the clamping blocks, preventing operator hand slippage and improving the comfort and efficiency of manual operation. The pre-compression design of the internal spring of the telescopic rod generates a stable clamping force upon release, ensuring a firm temporary clamping and providing a reliable guarantee for keeping the fixing part 2 stationary.

[0028] The working principle of this invention is as follows: When the operator uses this automotive radiator branch pipe outer diameter turning fixture, firstly, according to the length of the branch pipe to be processed, select the corresponding number of connectors 1, and connect adjacent sets of connectors 1 one by one through the studs 13 on one side of the rotating shaft 11 and the threaded holes 12 on the other side, assembling them into a support structure adapted to the length of the branch pipe. Then, using the studs 13 on one side of one set of rotating shaft 11, fix the assembled connectors 1 together to the lathe spindle, completing the docking of the fixture with the lathe. Subsequently, the automotive radiator branch pipe to be processed is coaxially sleeved on the outside of the clamping block 27 of the fixing part 2, and the position of the branch pipe is adjusted to ensure that its inner wall initially fits against the semi-circular rubber abutment block at the top of one set of clamping blocks 27, so that the branch pipe is kept coaxially positioned, completing the loading. Next, push the extension plate 314 along the axis of the rotating shaft 11, causing the support plate 312, which is inserted into the extension plate 314, to move synchronously. The support plate 312 pushes the top plate 39 through the connecting rod 311, so that the top plate 39 slides smoothly along the guide groove 37 and the guide groove 38. When the arc end of the top plate 39 contacts the bottom end of the push plate 34, continue to push the extension plate 314. The arc will generate an upward pushing force, which overcomes the preload of the push spring 36 and drives the push plate 34 to move upward. The push plate 34 simultaneously pulls the insertion rod 35 upward until the insertion rod 35 is completely disengaged from the insertion hole 31 and remains only in the insertion hole 32. At this time, the fixed connection between the rotating ring 21 and the rotating shaft 11 is officially released. After that, the fixing block 316 is inserted into the extension plate 314 through the connecting rod 315. In the connecting hole 313 of 14, the fixing block 321 is inserted into the connecting hole 319 of the top plate 39 through the connecting rod 320, ensuring that the two sets of connections are not loose. The operator holds the gripping edges of the clamping block 1 318 and the outer side of the clamping block 2 323 and slowly pulls it away from the center of the rotating shaft 11. The contraction springs inside the telescopic rod 1 317 and the telescopic rod 2 322 gradually release their elastic potential energy, and the inner cylinder extends outward along the outer cylinder until the rubber layer on the inner side of the clamping block 1 318 and the clamping block 2 323 is completely in contact with the outer circle of the branch pipe, forming a stable annular temporary clamp. Then, the lathe spindle is turned on, driving the rotating shaft 11 to rotate clockwise. Due to the static friction between the rubber layer of the temporary clamp and the outer circle of the branch pipe, and the guide groove limiting the extension plate 314 and the top plate 39, the clamping block 321 is inserted into the connecting hole 319 of the top plate 39. When the rotating shaft 11 rotates, the fixed part 2 remains stationary. At this time, the two sets of push threads 22 on the connecting part 1 rotate synchronously with the rotating shaft 11. Through the thread engagement, the two sets of push rings 23 move synchronously towards the rotating ring 21. The connecting lug 24 on the outer side of the push ring 23 moves closer to the rotating ring 21, thereby driving the adjusting rod 25 to rotate around the hinge post 212. Since the adjusting rod 25 and the adjusting rod 210 are hinged through the hinge post 212, and the other end of the adjusting rod 210 is fixed to the rotating ring 21 through the connecting lug 211, the rotation of the adjusting rod 25 will force the adjusting rod 210 to rotate synchronously. The included angle between the two gradually decreases. The adjusting rod 25 pushes the clamping block 27 to move radially away from the axis of the rotating shaft 11 through the connecting lug 26.Simultaneously, the connecting ear 29 slides in the T-shaped sliding groove 28 at the bottom of the clamping block 27 in a direction away from the hinge post 212, providing precise guidance for the clamping block 27. When the rubber abutment block at the top of the clamping block 27 tightly abuts against the inner wall of the branch pipe, and the lathe spindle load reaches the preset value, the centering and clamping process of the branch pipe is completed. When preparing to process the outer diameter of the branch pipe, first pull out the insertion fit between the connecting rod 2 315 and the connecting hole 2 313, and the insertion fit between the connecting rod 320 and the connecting hole 319 in sequence. Remove the fixing block 1 316, the telescopic rod 1 317, the clamping block 1 318, the fixing block 2 321, the telescopic rod 2 322, and the clamping block 2 323. Then pull the extension plate 314 in the opposite direction to move the top plate 39 and the support plate 312 from the guide groove 1 37 and the guide groove 2 38. After being pulled out, the push spring 36 returns to its original length after losing its pushing force. Under the action of the elastic force, it pushes the push plate 34 downward to reset, driving the insertion rod 35 to re-insert into the insertion hole 31 and insertion hole 32, so that the fixing part 2 and the rotating shaft 11 are fixedly connected again. At this time, the fixing part 2 can rotate synchronously with the rotating shaft 11. Finally, the lathe spindle is started again, driving the rotating shaft 11, the fixing part 2 and the clamped branch pipe to rotate synchronously and coaxially. After the speed stabilizes, the turning tool is started, and the outer diameter of the branch pipe is turned along the outer diameter surface according to the preset machining parameters until the machining of the outer diameter of the branch pipe is completed. Through the I-shaped cross-section design of the rotating ring 21 in the fixing part 2, a stable rotational fit with the rotating shaft 11 is achieved, and the axial movement is restricted by the annular protrusion, avoiding the displacement of the fixing part 2 during high-speed rotation. To mitigate machining deviations, two sets of symmetrical and oppositely oriented push threads 22 are used to ensure that the two sets of push rings 23 move inward synchronously when the lathe rotates, achieving symmetrical clamping of the branch pipe on both sides and avoiding the eccentricity problem caused by single-sided clamping. In addition, four sets of evenly distributed connecting lugs 1 24, 4 211, and corresponding adjusting rods 1 25 and 2 210 ensure that the four sets of clamping blocks 27 move radially synchronously and are subjected to uniform force, guaranteeing centering accuracy. Simultaneously, the rubber abutment blocks of the clamping blocks 27 and the anti-slip rubber layers of clamping blocks 1 318 and 2 323 form a flexible clamping mechanism from both inside and outside, preventing slippage of the branch pipe and avoiding metal scratches, ensuring that the surface roughness of the branch pipe meets process requirements. This is achieved through the threaded hole 12 of the rotating shaft 11 in the connector 1 and the stud 13. Multiple sets of connectors 1 can be flexibly spliced ​​according to the length of the branch pipe, eliminating the need for separate tooling design for branch pipes of different lengths and improving length adaptability. The eight sets of insertion holes 31 and 32 on the same cross section of the rotating shaft 11 in the release component 3 realize multi-angle positioning of the fixing component 2, and the position can be adjusted as needed, enhancing the flexibility of use. The plug-in connection between the support plate 312 and the extension plate 314 can adjust the component length according to the length of the rotating shaft 11 to adapt to different lathe specifications. In addition, the telescopic stroke of the telescopic rod 317 and the telescopic rod 322 can cover branch pipes of different diameters. It can be compatible with multiple specifications of branch pipes without replacing the core components, greatly reducing adaptation costs and changeover time. Through the pre-compression design of the push spring 36 in the release component 3, it automatically provides downward elastic force to the push plate 34.The initial insertion rod 35 is stably inserted into the insertion hole without manual pressing for positioning, simplifying the operation process. The triangular arc surface design of the top plate 39 converts the axial force of pushing the extension plate 314 into the upward pushing force of the push plate 34, saving effort and preventing wear on the bottom end of the push plate 34, thus extending the component's lifespan. The arc-shaped gripping edges of clamping blocks 1 (318) and 2 (323) and the knurled treatment of the inner rod of the telescopic rod reduce the difficulty of applying force manually and prevent hand slippage. At the same time, the tight fit between the T-shaped sliding groove 28 and the connecting ear 3 (29) provides precise guidance for the clamping block 27, avoiding clamping position deviation, ensuring processing stability, and reducing the scrap rate.

[0029] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A machining fixture for machining the outer diameter of an automotive radiator branch pipe, comprising: The connector (1) connected to the lathe is characterized in that the connector (1) is provided with a fixing member (2) for fixing the inner wall of the car water tank branch pipe, and the fixing member (2) is provided with a release member (3) for releasing the fixing member (2) so that the fixing member (2) does not rotate with the connector (1); The fixing member (2) includes a clamping block (27) and a rotating ring (21) rotatably connected to the connecting member (1). The outer surface of the fixing member (2) is provided with a push thread (22). The outer side of the push thread (22) is threaded with a push ring (23). An adjusting rod (25) is provided between the push ring (23) and the clamping block (27). An adjusting rod (210) is provided between the rotating ring (21) and the clamping block (27). The adjusting rod (25) and the adjusting rod (210) are arranged in a cross configuration. One end of the adjusting rod (25) is rotatably connected to a hinge column (212). One end of the hinge column (212) passes through the adjusting rod (210). The adjusting rod (25) and the adjusting rod (210) are hinged through the hinge column (212). When the lathe drives the connecting part (1) to rotate around its axis, and the release part (3) prevents the fixing part (2) from rotating with it, the push thread (22) drives the push ring (23) to move towards the rotating ring (21), and the connecting ear (24) moves closer to it, driving the adjusting rod (25) to rotate with the hinge column (212). Because the adjusting rod (25) is hinged with the adjusting rod (210), and the adjusting rod (210) is fixed below the clamping block (27) through the connecting ear (211), the angle between the adjusting rod (25) and the adjusting rod (210) is reduced, pushing the clamping block (27) to move radially. The end of the adjusting rod (210) slides in the sliding groove (28) and finally abuts against the inner wall of the branch pipe to achieve centering and clamping.

2. The machining fixture for the outer diameter of an automotive water tank branch pipe according to claim 1, characterized in that, The connector (1) includes a rotating shaft (11), a threaded hole (12) is fixedly connected to one end face of the rotating shaft (11), and a stud (13) adapted to the threaded hole (12) is opened on the other end face of the rotating shaft (11).

3. The machining fixture for the outer diameter of an automotive water tank branch pipe according to claim 2, characterized in that, The outer side of the propulsion ring (23) is fixedly connected to a connecting ear 1 (24), the bottom end of the clamping block (27) is fixedly provided with a connecting ear 2 (26), the adjusting rod 1 (25) is rotatably disposed between the connecting ear 1 (24) and the connecting ear 2 (26), the bottom end of the clamping block (27) is provided with a sliding groove (28), the sliding groove (28) is slidably connected with a connecting ear 3 (29), the outer circular surface of the rotating ring (21) is fixedly provided with a connecting ear 4 (211), and the adjusting rod 2 (210) is rotatably disposed between the connecting ear 3 (29) and the connecting ear 4 (211); Each set of rotating shafts (11) is provided with two sets of rotating rings (21), propulsion threads (22) and propulsion rings (23), and the two sets of rotating rings (21), propulsion threads (22) and propulsion rings (23) are symmetrically distributed, and the two sets of propulsion threads (22) have opposite thread directions.

4. The machining fixture for the outer diameter of an automotive water tank branch pipe according to claim 3, characterized in that, The release component (3) includes a first insertion hole (31) opened on the outer circular surface of the rotating shaft (11), and a second insertion hole (32) is opened through the outer circular surface of the rotating ring (21), and the first insertion hole (31) and the second insertion hole (32) are initially connected.

5. The machining fixture for the outer diameter of an automotive radiator branch pipe according to claim 4, characterized in that, The outer surface of the rotating ring (21) is fixedly connected to the mounting frame (33), and the mounting frame (33) is slidably connected to the push plate (34). The bottom end of the push plate (34) is fixedly connected to the insertion rod (35). One end of the insertion rod (35) passes through the mounting frame (33) and is slidably inserted into the insertion hole one (31) and insertion hole two (32). The top end of the push plate (34) is fixedly connected to the push spring (36), and one end of the push spring (36) is fixedly connected to the top end of the inside of the mounting frame (33).

6. The machining fixture for the outer diameter of an automotive water tank branch pipe according to claim 5, characterized in that, The bottom end of the push plate (34) is provided with a guide groove 1 (37), and the bottom end of the mounting frame (33) is provided with a guide groove 2 (38). The guide groove 1 (37) and the guide groove 2 (38) are symmetrically distributed.

7. A machining fixture for the outer diameter of an automotive water tank branch pipe according to claim 6, characterized in that, The release component (3) also includes a top plate (39) that is slidably inserted into the guide groove one (37) and the guide groove two (38). One end of the top plate (39) is provided with a connection hole one (310). A connecting rod one (311) is inserted into the connection hole one (310). One end of the connecting rod one (311) is fixedly connected to a support plate (312). One end of the support plate (312) is fixedly provided with a connection hole two (313).

8. The machining fixture for the outer diameter of an automotive radiator branch pipe according to claim 7, characterized in that, The support plate (312) is provided with an extension plate (314) at one end. The extension plate (314) is also provided with a connecting rod (311) and a connecting hole (313) at both ends. The connecting hole (313) on the support plate (312) and the connecting rod (311) on the extension plate (314) are inserted into each other.

9. A machining fixture for the outer diameter of an automotive radiator branch pipe according to claim 8, characterized in that, A connecting rod 2 (315) is inserted into the connecting hole 2 (313) on the extension plate (314). A fixing block 1 (316) is fixedly connected to one end of the connecting rod 2 (315). A telescopic rod 1 (317) is fixedly connected to one end of the fixing block 1 (316). A clamping block 1 (318) is fixedly connected to the top end of the telescopic rod 1 (317). A connecting hole 3 (319) is opened at one end of the top plate (39). A connecting rod 3 (320) is inserted into the connecting hole 3 (319). A fixing block 2 (321) is fixedly connected to one end of the connecting rod 3 (320). A telescopic rod 2 (322) is fixedly connected to one end of the fixing block 2 (321). A clamping block 2 (323) is fixedly connected to one end of the telescopic rod 2 (322).

10. A method for machining the outer diameter of an automotive radiator branch pipe, using the machining fixture for the outer diameter of an automotive radiator branch pipe as described in claim 9, characterized in that, Includes the following steps: S1. First, select the connector (1) according to the length of the branch pipe to be processed. Assemble the matching support structure by connecting the stud (13) of the rotating shaft (11) with the threaded hole (12). Connect the connector (1) with the lathe spindle by a set of studs (13). Then, put the branch pipe coaxially on the clamping block (27) of the fixing part (2) and adjust it so that the inner wall of the branch pipe fits the rubber abutment block of the clamping block (27) to complete the loading. S2. After that, push the extension plate (314) to drive the support plate (312) and the top plate (39) to slide. The top plate (39) pushes the plate (34) to make the insertion rod (35) disengage from the insertion hole one (31). Release the connection between the rotating ring (21) and the rotating shaft (11), and install the fixing block one (316) and the fixing block two (321). Pull the clamping blocks one (318) and two (323) to form a temporary clamp. Start the main shaft to make the fixing part (2) stop. Push the thread (22) to drive the clamping block (27) to center and clamp. Then remove the temporary assembly and reset the insertion rod (35). S3. Finally, start the lathe spindle again to drive the rotating shaft (11), the fixed part (2) and the branch pipe to rotate synchronously. After the speed stabilizes, start the turning tool and turn along the outer circle of the branch pipe according to the preset parameters until the outer circle of the branch pipe is completed.

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