A uniform force tool device for copper tube flaring processing

Abstract

The utility model provides a kind of even force tooling device of copper pipe flaring processing belongs to tooling technical field, the even force tooling device of copper pipe flaring processing includes flaring main body, clamping seat, top pressure cone head and adjusting ring;The flaring main body is hollow cylindrical structure, the inner wall surface of flaring main body is conical and gradually changes shape, the large diameter end surface of flaring main body is fixedly connected with clamping seat, and the small diameter end surface of flaring main body forms feed inlet;The clamping seat is annular structure, the central axis of clamping seat coincides with the central axis of flaring main body, and the inner ring of clamping seat is provided with multiple uniformly distributed radial clamping grooves, and clamping block is slidably arranged in each radial clamping groove;The top pressure cone head is arranged in the inner cavity of flaring main body, and the conical outer surface of top pressure cone head and the conical inner wall surface of flaring main body form a fit gap, and the utility model can solve the problem that copper pipe flaring processing exists uneven stress at flaring position, leading to irregular deformation of pipe opening.

Description

Technical Field

[0001] This utility model belongs to the field of tooling technology, specifically, it relates to a uniform force-bearing tooling device for copper tube flaring. Background Technology

[0002] Copper pipe flaring is a crucial process in refrigeration and air conditioning, water supply and drainage pipelines, and heat exchangers. It involves radially expanding the end of a copper pipe to create a flared or bell-shaped joint, meeting the sealing and strength requirements of the pipe connection. In actual production, copper pipe flaring primarily employs mechanical or hydraulic jacking. A conical jacking head is pushed into the end of the copper pipe, and the wedging effect of the conical surface causes plastic deformation of the pipe end, achieving flaring. Traditional flaring fixtures typically use a single jacking head with a simple pipe end fixing device. When the jacking head advances axially, the copper pipe end mainly relies on its own rigidity to resist the radial expansion force. Due to the thin wall thickness and anisotropic nature of the copper pipe, the supporting and expansion forces on different points around the circumference of the pipe end are often uneven during the jacking process. This leads to defects such as elliptical deformation, uneven wall thickness, localized wrinkling, or cracking after flaring. This uneven stress problem is particularly pronounced when processing thin-walled copper pipes or pipes with large flaring ratios, severely affecting the flaring quality and the sealing performance of subsequent assembly. To address this issue, some existing technologies employ methods such as adding auxiliary support devices or incorporating multiple conical surfaces on the pressure head. However, these solutions often result in complex tooling structures, high manufacturing costs, cumbersome operation, and poor adaptability to different copper tube specifications, requiring specialized tooling for different tube diameters, thus limiting their widespread application in production. Therefore, developing a simple tooling device that can achieve uniform stress distribution during copper tube flaring and possesses strong adaptability has become an urgent technical need in the copper tube processing field. Utility Model Content

[0003] In view of this, the present invention provides a uniform force-bearing tooling device for copper tube flaring, which can solve the technical problem in the prior art that uneven force on the flaring part during copper tube flaring leads to irregular deformation of the tube opening.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a uniformly stressed tooling device for copper tube flaring, comprising a flaring body, a clamping seat, a top-pressing cone, and an adjusting ring. The flaring body is a hollow cylindrical structure with a tapered, gradually tapered inner wall. The large-diameter end face of the flaring body is fixedly connected to the clamping seat, and the small-diameter end face forms a feed inlet. The clamping seat is an annular structure with its central axis coinciding with the central axis of the flaring body. Multiple evenly distributed radial clamping grooves are provided on the inner ring of the clamping seat, and a clamping block is slidably disposed within each radial clamping groove. The top-pressing cone passes through the inner cavity of the flaring body, with its tapered outer surface forming a fitting gap with the tapered inner wall of the flaring body. The small-diameter end of the top-pressing cone extends beyond the feed inlet of the flaring body, and its large-diameter end is threadedly connected to the adjusting ring. The adjusting ring is sleeved on the outer circumference of the clamping seat, and when the adjusting ring rotates circumferentially along the clamping seat, it drives the top-pressing cone to move axially along the flaring body.

[0006] The technical advantages of the uniform force-bearing fixture for copper tube flaring provided by this utility model are as follows: Through the conical fit between the flaring body and the top-pressing cone, the radial expansion force on the copper tube during flaring is evenly distributed circumferentially, avoiding tube deformation or cracking caused by uneven force. Multiple radial clamping grooves on the clamping seat cooperate with the clamping blocks to achieve multi-point synchronous clamping of the copper tube's outer wall, ensuring axial positioning accuracy during processing. The adjusting ring drives the axial movement of the top-pressing cone through a threaded connection, achieving precise control of the flaring depth. This allows the flaring requirements of copper tubes of different specifications to be met. The overall structure is simple and reliable, and the operation is convenient and efficient.

[0007] Based on the above technical solution, the uniform force-bearing tooling device for copper tube flaring processing of this utility model can be further improved as follows:

[0008] The cone angle of the conical inner wall of the flared body is 15°~25°, and the wall thickness of the flared body is uniformly distributed along the axial direction.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the conical inner wall surface of the flared body is set with a specific cone angle range, so that the radial expansion force applied to the end of the copper tube by the top pressing cone head gradually increases during the pushing process, avoiding stress concentration caused by excessive cone angle or low processing efficiency caused by excessive cone angle; the design of uniform wall thickness along the axial direction ensures that the flared body has consistent rigidity when subjected to radial reaction force, preventing deformation caused by insufficient local strength, thereby improving the service life and processing accuracy of the device.

[0010] Furthermore, the clamping seat has eight radial clamping grooves, each radial clamping groove is distributed at equal angles along the circumference of the clamping seat, and the radial depth of each radial clamping groove is greater than the radial thickness of the clamping block.

[0011] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The radial clamping groove adopts an 8-angled design, which makes the copper tube outer wall uniformly distributed in the circumferential direction, effectively preventing the copper tube from shifting or rotating during the flaring process; The depth of the radial clamping groove is greater than the thickness of the clamping block, providing sufficient radial movement space for the clamping block, so that the clamping block can simultaneously tighten inward or loosen outward when the adjusting ring drives the top pressure cone to move, realizing adaptive clamping of copper tubes with different outer diameters, improving the versatility and clamping reliability of the device.

[0012] Furthermore, the inner surface of the clamping block has an arc-shaped concave structure, the radius of curvature of which is adapted to the outer diameter of the copper tube to be processed, and the outer surface of the clamping block has a planar structure.

[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the inner side of the clamping block adopts an arc-shaped concave structure, which makes the clamping block form a surface contact with the outer wall of the copper tube rather than a point contact or line contact, significantly increasing the contact area, reducing the contact stress per unit area, and avoiding indentation or damage to the outer wall of the copper tube during clamping; the radius of curvature of the arc-shaped concave structure is adapted to the outer diameter of the copper tube, ensuring that the clamping block can fit the outer surface of the copper tube, further improving the clamping stability; the planar structure of the outer side facilitates the sliding of the clamping block in the radial clamping groove, reducing frictional resistance.

[0014] Furthermore, the conical outer surface of the top pressure cone is provided with multiple evenly distributed longitudinal guide grooves along the axial direction. The depth of the longitudinal guide grooves gradually decreases along the axial direction of the top pressure cone, and the number of longitudinal guide grooves is the same as the number of clamping blocks.

[0015] The beneficial effects of the above-mentioned improvement scheme are as follows: The conical outer surface of the top-pressure cone is provided with longitudinal guide grooves. When the top-pressure cone pushes the end of the copper tube for flaring, these longitudinal guide grooves can provide a discharge channel for the metal chips and lubricant generated during the processing, preventing the metal chips from accumulating in the fitting gap between the top-pressure cone and the flaring body and causing jamming; The design of the groove depth gradually decreasing along the axial direction makes the guide groove have a large chip-carrying space at the small diameter end of the top-pressure cone, while maintaining the structural strength of the top-pressure cone at the large diameter end. The number of longitudinal guide grooves is the same as the number of clamping blocks, ensuring that the chip discharge channel corresponds to the clamping position and optimizing the smoothness of processing.

[0016] Furthermore, the small-diameter end face of the top-pressing cone forms a frustum-shaped guide portion, the outer diameter of the guide portion is smaller than the outer diameter of the small-diameter end of the top-pressing cone, and the axial height of the guide portion is 1 / 10 to 1 / 5 of the total length of the top-pressing cone.

[0017] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the frustum-shaped guide part at the small diameter end of the top-pressure cone can play a pre-guiding role when the copper tube is inserted into the flaring body, guiding the end of the copper tube to accurately enter the processing area between the top-pressure cone and the flaring body, avoiding the copper tube end from colliding with the top-pressure cone or the flaring body and producing burrs or scratches; the outer diameter of the guide part is smaller than the outer diameter of the small diameter end of the top-pressure cone, forming a stepped transition structure, so that the radial force on the copper tube is smaller at the initial contact, and the expansion force gradually increases as the top-pressure cone advances, realizing a smooth flaring process and reducing the risk of cracking at the end of the copper tube.

[0018] Furthermore, the large-diameter end face of the flared body is fixedly connected to the end face of the clamping seat by welding, and the welding part forms a continuous annular weld, the width of which is greater than the wall thickness of the flared body.

[0019] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the flaring body and the clamping seat are fixedly connected by welding to form a solid integrated structure, which can withstand the large radial reaction force and axial thrust generated during the flaring process, and avoid device failure or reduction in processing accuracy due to loose connection; the continuous distribution of the circumferential weld ensures that the connection part has uniform connection strength in the circumferential direction and eliminates stress concentration points; the design of the weld width being greater than the wall thickness of the flaring body increases the welding contact area, further improves the connection reliability, and extends the service life of the device.

[0020] Compared with existing technologies, the beneficial effects of the uniform force-bearing tooling device for copper tube flaring provided by this utility model are as follows: This utility model achieves high uniformity of circumferential force on the copper tube end during flaring through the conical fit structure between the inner wall of the flaring body and the outer surface of the top-pressure cone, combined with the synergistic effect of multiple evenly distributed radial clamping grooves and clamping blocks on the clamping seat. This effectively solves the problems of irregular tube end deformation and excessive ellipticity in traditional flaring processes. The device achieves precise control of the flaring depth through the threaded connection between the adjusting ring and the top-pressure cone. It is easy to operate and has high adjustment accuracy, suitable for flaring needs of copper tubes of different specifications, significantly improving the versatility and efficiency of the tooling. The longitudinal guide groove design on the top-pressure cone ensures smooth discharge of metal chips and lubricant during processing, avoiding jamming caused by impurity accumulation and improving processing continuity. The arc-shaped concave structure on the inner side of the clamping block forms surface contact with the outer wall of the copper tube, significantly reducing contact stress and preventing damage to the outer surface of the copper tube. The overall structure adopts a reasonable combination of materials such as alloy steel, carbon steel, tool steel and aluminum alloy. While ensuring the strength and durability of the device, it also takes into account the ease of operation and manufacturing cost. Compared with traditional tooling, this utility model significantly improves the quality stability of copper tube flaring processing, reduces the defect rate, reduces the frequency of tooling replacement, and improves production efficiency. It provides the copper tube processing industry with a simple structure, reliable performance and strong adaptability for flaring processing. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A front view of a uniformly stressed tooling device for flaring copper tubes;

[0023] Figure 2 A cross-sectional view of the flaring body of a uniformly stressed tooling device for flaring copper tubes;

[0024] Figure 3 A cross-sectional view of a uniformly stressed tooling device for flaring copper tubes.

[0025] The attached diagram lists the components represented by each number as follows:

[0026] 10. Flared body; 11. Feed inlet; 20. Clamping seat; 21. Radial clamping groove; 22. Clamping block; 30. Top pressure cone; 31. Longitudinal guide groove; 40. Adjusting ring. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0028] like Figure 1-3 The image shows an embodiment of a uniformly stressed tooling device for flaring copper tubes according to this utility model. In this embodiment, it includes a flaring body 10, a clamping seat 20, a pressing cone 30, and an adjusting ring 440. The flaring body is a hollow cylindrical structure with a tapered, gradually changing inner wall shape. The large-diameter end face of the flaring body is fixedly connected to the clamping seat, and the small-diameter end face forms a feed inlet 11. The clamping seat is an annular structure, and its central axis coincides with the central axis of the flaring body. The inner ring of the clamping seat is provided with multiple evenly distributed radial clamping grooves 21, and a clamping block 22 is slidably disposed in each radial clamping groove; the top pressure cone is inserted into the inner cavity of the flaring body, and the conical outer surface of the top pressure cone forms a fitting gap with the conical inner wall surface of the flaring body; the small diameter end of the top pressure cone extends out of the feed port of the flaring body, and the large diameter end of the top pressure cone is threadedly connected to the adjusting ring; the adjusting ring is sleeved on the outer circumference of the clamping seat, and when the adjusting ring rotates along the circumference of the clamping seat, it drives the top pressure cone to move along the axial direction of the flaring body.

[0029] This application is for flaring the ends of copper tubes.

[0030] In the above technical solution, the cone angle of the conical inner wall surface of the flared body is 15°~25°, and the wall thickness of the flared body is uniformly distributed along the axial direction.

[0031] Furthermore, in the above technical solution, the clamping seat has 8 radial clamping grooves, each radial clamping groove is distributed at equal angles along the circumference of the clamping seat, and the radial depth of each radial clamping groove is greater than the radial thickness of the clamping block.

[0032] Furthermore, in the above technical solution, the inner side of the clamping block has an arc-shaped concave structure, the radius of curvature of the arc-shaped concave structure is adapted to the outer diameter of the copper tube to be processed, and the outer side of the clamping block has a planar structure.

[0033] Furthermore, in the above technical solution, the conical outer surface of the top pressure cone is provided with multiple evenly distributed longitudinal guide grooves 31 along the axial direction. The depth of the longitudinal guide grooves gradually decreases along the axial direction of the top pressure cone, and the number of longitudinal guide grooves is the same as the number of clamping blocks.

[0034] Furthermore, in the above technical solution, the small-diameter end face of the top-pressing cone forms a frustum-shaped guide portion, the outer diameter of the guide portion is smaller than the outer diameter of the small-diameter end of the top-pressing cone, and the axial height of the guide portion is 1 / 10 to 1 / 5 of the total length of the top-pressing cone.

[0035] Furthermore, in the above technical solution, the large-diameter end face of the flared body and the end face of the clamping seat are fixedly connected by welding, and the welding part forms a continuous circumferential weld, the width of which is greater than the wall thickness of the flared body.

[0036] First, insert the copper tube to be processed into the feed port of the flaring body, so that the end of the copper tube passes through the small-diameter end of the top-pressing cone and extends into the fitting gap between the flaring body and the top-pressing cone. The insertion depth of the copper tube should ensure that the part to be flared is completely within the conical inner wall surface of the flaring body. Then, rotate the adjusting ring to push the top-pressing cone inward along the axial direction of the flaring body. At this time, the clamping block on the clamping seat slides inward in the radial clamping groove, clamping the outer wall of the copper tube and fixing the axial position of the copper tube. Continue to rotate the adjusting ring, and the conical outer surface of the top-pressing cone gradually wedges into the inner hole of the copper tube end, applying a radial expansion force to the copper tube end. The copper tube end undergoes radial expansion deformation under the push of the conical surface of the top-pressing cone. At the same time, the conical inner wall surface of the flaring body provides support to the outer side of the copper tube end, so that the copper tube is evenly stressed in the circumferential direction. The operator controls the number of rotations of the adjusting ring according to the required flaring size. When the top-pressing cone is pushed to the predetermined position, the rotation is stopped, and the end of the copper tube is flared. After processing, the adjusting ring is rotated in the opposite direction, and the top pressure cone head retracts axially under the action of the threaded connection. The clamping block then slides outward in the radial clamping groove, releasing the clamping of the copper tube. At this time, the processed copper tube can be taken out from the feed port of the flared body. The whole operation process is simple and quick, and can be mastered without professional skills training. It is suitable for use in various copper tube processing workshops and on-site construction environments.

[0037] The following is a specific embodiment 1 of this utility model: This embodiment provides a flaring fixture for processing copper tubes with an outer diameter of 12mm and a wall thickness of 1mm. The flaring body is made of 45 alloy steel, with a hollow cylindrical structure, an outer diameter of 60mm, a total length of 80mm, and an inner wall surface with a tapered gradient shape and a cone angle of 20°. The inner diameter of the large diameter end is 22mm, the inner diameter of the small diameter end is 14mm, and the wall thickness is 6mm, evenly distributed along the axial direction. The end face of the large diameter end is precision machined to form a flat connecting surface. The clamping seat is made of Q235 carbon steel, with a ring structure, an outer diameter of 90mm, an inner diameter of 50mm, and a thickness of 25mm. The central axis coincides with the central axis of the flaring body. The clamping seat and the large diameter end face of the flaring body are fixed by argon arc welding, with a weld width of 8mm, forming a continuous ring weld. After welding, annealing treatment is performed to eliminate welding stress. The inner ring of the clamping seat has eight radial clamping grooves evenly spaced circumferentially. Each radial clamping groove is 8mm wide and 15mm deep, with an angle of 45° between adjacent grooves. A clamping block is slidably disposed within each radial clamping groove. The clamping block is made of T10 tool steel and hardened to HRC50~HRC55 after quenching and tempering. The clamping block has a radial thickness of 12mm, a width of 7mm, and an axial length of 20mm. The inner surface of the clamping block is machined into an arc-shaped recess with a radius of curvature of 6mm to fit the outer surface of a 12mm outer diameter copper tube. The outer surface of the clamping block is a flat structure that slides into the bottom surface of the radial clamping groove with a clearance of 0.1mm. The top-pressing cone is made of Cr12MoV tool steel, and its surface hardness reaches HRC58~HRC62 after heat treatment. The cone angle of the outer conical surface of the top-pressing cone is 20°, which is consistent with the cone angle of the inner conical wall of the flared body. The outer diameter of the small-diameter end of the top-pressing cone is 13mm, the outer diameter of the large-diameter end is 21mm, and the total length is 70mm. Eight longitudinal guide grooves are evenly distributed along the axial direction on the outer conical surface. The width of each longitudinal guide groove is 3mm, and the groove depth is 2mm at the small-diameter end, decreasing linearly to 0.5mm towards the large-diameter end. The positions of the longitudinal guide grooves correspond to the positions of the clamping blocks in the circumferential direction. The end face of the small-diameter end of the top-pressing cone is machined to form a frustum-shaped guide part with an outer diameter of 10mm and an axial height of 10mm. The end face of the guide part has a rounded transition to avoid scratching the end of the copper tube. The large-diameter end of the pressure cone is machined with an external thread, the thread specification is M20×1.5, and the thread length is 30mm. The adjusting ring is made of 6061 aluminum alloy, with a ring structure, an outer diameter of 110mm, an inner diameter of 70mm, and a thickness of 20mm. The inner ring of the adjusting ring is machined with an M20×1.5 internal thread that matches the external thread of the pressure cone, and the thread hole depth is 25mm. The outer circumference of the adjusting ring is machined with knurling at 5mm intervals for easy manual rotation.An adjusting ring is fitted around the outer circumference of the clamping seat and is threaded to engage with the large-diameter end of the pressure cone. When the adjusting ring rotates one revolution, the pressure cone moves 1.5 mm axially. The pressure cone passes through the inner cavity of the flared body. The fit clearance between the conical outer surface of the pressure cone and the conical inner wall of the flared body is 0.5 mm at the small-diameter end and 1 mm at the large-diameter end, with the clearance exhibiting a linear distribution along the axial direction. In use, insert a 12mm outer diameter copper tube into the feed port at the small diameter end of the flaring body. The end of the copper tube passes through the guide part of the top pressure cone and enters the fitting gap. Rotate the adjusting ring to push the top pressure cone inward. The clamping block slides inward in the radial clamping groove to clamp the copper tube. Continue to rotate the adjusting ring for about 8 turns, and the top pressure cone will advance 12mm. The end of the copper tube will be uniformly flared under the dual constraints of the top pressure cone and the flaring body. The outer diameter of the flared tube will reach 18mm, the flaring depth will be 15mm, the ovality of the tube opening will be less than 0.2mm, and the surface will be smooth and free of cracks. The metal chips generated during the processing will be discharged through the longitudinal guide groove. The entire flaring operation takes about 30 seconds. The operation is simple and the flaring quality is stable.

[0038] The following is another specific embodiment 2 of this utility model: This embodiment 2 is an improvement on embodiment 1, specifically for a copper tube with an outer diameter of 16mm and a wall thickness of 1.2mm. The inner diameter of the large-diameter end of the flared body is adjusted to 26mm, and the inner diameter of the small-diameter end is adjusted to 18mm, while other dimensions remain unchanged. The radius of curvature of the arc-shaped concave structure on the inner side of the clamping block is adjusted to 8mm to match the 16mm outer diameter copper tube, and the radial thickness of the clamping block is increased to 14mm. The outer diameter of the small-diameter end of the pressing cone is adjusted to 17mm, the outer diameter of the large-diameter end is adjusted to 25mm, and the outer diameter of the guide is adjusted to 14mm, while other structural parameters remain unchanged. The fitting clearance between the pressing cone and the flared body is adjusted to 0.6mm at the small-diameter end and 1.2mm at the large-diameter end. The adjusted device was used to flare a 16mm outer diameter copper tube. The adjusting ring was rotated about 10 times, and the top pressure cone was advanced 15mm. The outer diameter of the flared tube reached 22mm, the flaring depth was 18mm, and the ovality of the tube opening was less than 0.25mm. The processing quality was good, which verified the adaptability of this utility model to copper tubes of different specifications. By changing the top pressure cone of different specifications and adjusting the clamping block parameters, flaring processing of various copper tube specifications can be achieved without changing the entire set of tooling, which significantly improves the efficiency and economy of use.

[0039] The following is another specific embodiment 3 of this utility model: This embodiment 3 is based on embodiment 1, and improves the longitudinal guide groove of the top-pressure cone head to improve the metal chip removal efficiency. The number of longitudinal guide grooves is increased from 8 to 12, the width of each longitudinal guide groove is adjusted to 2mm, the groove depth at the small diameter end is maintained at 2mm, and the groove depth decreases parabolically to 0.3mm along the axial direction towards the large diameter end, making the chip space distribution of the guide groove more reasonable. At the same time, a 0.5mm chamfer transition is added at the junction of the conical outer surface of the top-pressure cone head and the longitudinal guide groove to avoid sharp edges scratching the inner wall of the copper tube. The conical inner wall surface of the flared body is machined with an annular drag-reducing groove with a width of 0.5mm and a depth of 0.3mm every 10mm along the axial direction, for a total of 6 annular drag-reducing grooves. These annular drag-reducing grooves and the longitudinal guide grooves on the top-pressure cone head form a three-dimensional chip removal network, allowing metal chips and lubricant to be discharged more smoothly from the mating gap. The outer surface of the clamping block is designed with a longitudinal groove, 3mm wide and 1mm deep, which connects with the radial clamping groove to form an additional chip removal channel. A lubricating oil groove is added to the inner threaded hole of the adjusting ring. The groove is spirally distributed, 2mm wide and 1mm deep, which allows for even distribution of lubricating oil to the threaded mating surface when the adjusting ring is rotated, reducing rotational resistance and thread wear. Using the improved device for continuous flaring of 12mm outer diameter copper tubes, after processing 50 tubes, only a small amount of metal chips remained in the mating gap between the pressure cone and the flaring body. The operating force of the rotating adjusting ring remained stable, and no jamming due to metal chip accumulation occurred. The flaring quality stability was significantly improved. Compared to the structure of Example 1, the improvements in Example 3 increase the continuous processing capacity of the device by approximately 40% and extend the cleaning and maintenance cycle by approximately 50%. It is particularly suitable for production scenarios involving large-volume copper tube flaring, verifying that optimizing the chip removal structure and lubrication system can further improve the practicality and reliability of the device, providing a more efficient and stable tooling solution for copper tube flaring.

[0040] Specifically, the principle of this invention is as follows: This invention utilizes a structural design where the conical inner wall of the flaring body and the conical outer surface of the pressing cone form a fitting gap. The end of the copper tube is placed between these two conical surfaces for flaring. When the pressing cone advances axially under the drive of the adjusting ring, the end of the copper tube is subjected to the radial expansion force of the pressing cone's conical surface. Simultaneously, the conical inner wall of the flaring body provides continuous circumferential support to the outer side of the copper tube end. This dual constraint of the inner and outer conical surfaces ensures uniform control of the radial deformation of the copper tube during the flaring process, avoiding uneven force distribution caused by unilateral pressing. Multiple radial clamping slots on the clamping seat contain clamping blocks evenly distributed circumferentially, achieving multi-point synchronous clamping of the copper tube's outer wall. As the pressing cone advances, the clamping blocks adaptively slide within the radial clamping slots according to the change in the copper tube's outer diameter, maintaining stable clamping of the copper tube and ensuring its fixed axial position without rotational displacement, providing a reliable positioning reference for the flaring process. The longitudinal guide grooves on the pressure cone head form a chip removal channel during processing, allowing metal chips and lubricant to be discharged from the mating gap in a timely manner. This prevents impurities from accumulating and affecting the advancing movement of the pressure cone head, ensuring the continuity and stability of the processing. The adjusting ring converts the rotational motion into the axial linear motion of the pressure cone head through a threaded connection. The screw drive has self-locking and reversible motion, which can precisely control the advancing depth of the pressure cone head to meet the processing requirements of different flaring sizes. It can also easily return the pressure cone head to its initial position after processing. The entire working process does not require a complex power unit or control system. The ingenious combination of mechanical structures can achieve uniform force and precise forming of copper tube flaring, fundamentally solving the technical problem of uneven force distribution in traditional flaring tooling.

[0041] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A uniformly stressed tooling device for flaring copper tubes, characterized in that, The device includes a flaring body, a clamping seat, a top-pressing cone, and an adjusting ring. The flaring body is a hollow cylindrical structure with a tapered, gradually tapered inner wall. The large-diameter end face of the flaring body is fixedly connected to the clamping seat, and the small-diameter end face forms the feed inlet. The clamping seat is an annular structure with its central axis coinciding with the central axis of the flaring body. Multiple evenly distributed radial clamping grooves are provided on the inner ring of the clamping seat, and a clamping block is slidably disposed within each radial clamping groove. The top-pressing cone passes through the inner cavity of the flaring body, with its tapered outer surface forming a fitting gap with the tapered inner wall of the flaring body. The small-diameter end of the top-pressing cone extends beyond the feed inlet of the flaring body, and its large-diameter end is threadedly connected to the adjusting ring. The adjusting ring is sleeved on the outer circumference of the clamping seat, and when the adjusting ring rotates circumferentially along the clamping seat, it drives the top-pressing cone to move axially along the flaring body.

2. The uniform force-bearing tooling device for copper tube flaring according to claim 1, characterized in that, The cone angle of the conical inner wall of the flared body is 15°~25°, and the wall thickness of the flared body is uniformly distributed along the axial direction.

3. The uniform force-bearing tooling device for copper tube flaring according to claim 2, characterized in that, The clamping seat has eight radial clamping grooves, each radial clamping groove is distributed at equal angles along the circumference of the clamping seat, and the radial depth of each radial clamping groove is greater than the radial thickness of the clamping block.

4. The uniform force-bearing fixture for copper tube flaring according to claim 3, characterized in that, The inner surface of the clamping block has an arc-shaped concave structure, and the radius of curvature of the arc-shaped concave structure is adapted to the outer diameter of the copper tube to be processed. The outer surface of the clamping block has a planar structure.

5. The uniform force-bearing tooling device for copper tube flaring according to claim 4, characterized in that, The conical outer surface of the top pressure cone is provided with multiple evenly distributed longitudinal guide grooves along the axial direction. The depth of the longitudinal guide grooves gradually decreases along the axial direction of the top pressure cone, and the number of longitudinal guide grooves is the same as the number of clamping blocks.

6. The uniform force-bearing tooling device for copper tube flaring according to claim 5, characterized in that, The small-diameter end face of the top-pressure cone forms a frustum-shaped guide portion. The outer diameter of the guide portion is smaller than the outer diameter of the small-diameter end of the top-pressure cone, and the axial height of the guide portion is 1 / 10 to 1 / 5 of the total length of the top-pressure cone.

7. The uniform force-bearing fixture for copper tube flaring according to claim 6, characterized in that, The large-diameter end face of the flared body is fixedly connected to the end face of the clamping seat by welding, and the welding part forms a continuous annular weld, the width of which is greater than the wall thickness of the flared body.

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