Pipe orifice machining die and machining method

Abstract

The invention relates to a pipe orifice machining mold and method, the pipe orifice machining mold comprises a forming module and a clamping and positioning module, the clamping and positioning module is used for clamping a pipe fitting, the forming module comprises a cavity assembly, a core assembly and an elastic piece, and the cavity assembly is provided with a forming groove; the outer wall of the mold core assembly and the inner wall of the forming groove form a forming cavity used for pipe fitting port forming. When the forming module moves in the direction close to the clamping and positioning module and the heat dissipation part in the pipe body is stopped at the end of the mold core assembly, the mold core assembly is arranged at the end opening of the pipe body in a supporting mode, and the mold core assembly can overcome the elastic force of the elastic piece till the forming cavity is arranged on the peripheral side of the pipe body in a sleeving mode. And the outer wall of the pipe body can be extruded in the forming cavity to form a chamfer. According to the pipe orifice machining die and method, the problem that when a die extrusion forming method is used for machining chamfers, irregular collapse of pipe orifices of a flat pipe set is likely to occur is solved.

Description

Technical Field

[0001] The present application relates to the technical field of flat tube processing molds, and in particular to a tube orifice processing mold and a processing method. Background Art

[0002] In one type of plate radiator design, a flat tube assembly needs to be inserted into a flat hole in the main plate to form a heat exchange core assembly. However, if the ends of the flat tube assembly are not provided with chamfers extending along the circumference of the tube opening, the flat tube assembly cannot be smoothly inserted into the flat hole in the main plate.

[0003] However, it is still difficult to manufacture annular chamfers for flat tube groups. Specifically, if the chamfers are machined by turning, the machining cost is too high and the machining efficiency is low, which is not conducive to the large-scale production of flat tube groups.

[0004] Therefore, the current mainstream practice is to use mold extrusion molding to process chamfers. However, the current mold extrusion molding method is prone to problems such as irregular collapse of the tube mouth of the flat tube group when processing chamfers, which is not conducive to improving the processing yield and may even affect the production efficiency and quality of the plate radiator. Summary of the Invention

[0005] Based on this, it is necessary to provide a pipe mouth processing mold and processing method to solve the problem that the pipe mouth of the flat tube group is prone to irregular collapse when processing chamfers in the existing mold extrusion molding method.

[0006] The pipe mouth processing mold provided in the present application includes a forming module and a clamping and positioning module. The clamping and positioning module is used to clamp the pipe fitting. The pipe fitting includes a pipe body and a heat dissipation part, and the heat dissipation part is installed inside the pipe body; the forming module includes a cavity assembly, a core assembly and an elastic member. The cavity assembly is provided with a forming groove. One end of the core assembly is movably matched with the cavity assembly, and the other end extends toward a side close to the clamping and positioning module. The outer wall of the core assembly and the inner wall of the forming groove constitute a forming cavity for forming the pipe fitting port; the elastic member can exert an elastic force on the core assembly so that the core assembly has a tendency to move toward the direction close to the clamping and positioning module; when the forming module moves toward the direction close to the clamping and positioning module, and the heat dissipation part in the pipe body stops at the end of the core assembly, the core assembly support is arranged at the port of the pipe body, and the core assembly can compress the elastic member until the forming cavity is sleeved on the outer peripheral side of the pipe body, and the outer wall of the pipe body can be squeezed in the forming cavity and form a chamfer.

[0007] In one embodiment, an annular protrusion is provided on the outer peripheral side of the core assembly near one end of the clamping and positioning module; when the core assembly is inserted into the tube body and abuts against the heat dissipation part, the annular protrusion away from the outer ring of the core assembly can be movably supported and cooperated with the inner wall of the tube body, and the surface of the core assembly and the inner wall of the tube body are spaced apart; when the molding cavity is sleeved on the outer peripheral side of the tube body, the inner wall of the molding cavity can compress the side wall of the tube body to shrink toward the center of the tube body and abut against the surface of the core assembly, so that a neck is formed at the end of the tube body.

[0008] In one embodiment, the maximum length of the core component extending from the outer wall of the cavity component is greater than or equal to a preset distance.

[0009] In one embodiment, the cavity assembly includes a die base, an intermediate connecting piece and a fixed die base. The die base is fixedly connected to the fixed die base through the intermediate connecting piece. The die base and the fixed die base are spaced apart to form a movable cavity. The molding groove is arranged at one end of the die base away from the fixed die base. One end of the core assembly is movably arranged in the movable cavity, and the other end is movably arranged in the die base and passes through the outer wall of the die base through the molding groove.

[0010] In one embodiment, the core assembly includes a core body, a first fixed plate and a second fixed plate, the second fixed plate is connected to one side of the first fixed plate by a fastener, the first fixed plate is provided with a card slot set through, the core body is inserted into the card slot and abuts against the second fixed plate, and the core body is connected to the second fixed plate by a fastener.

[0011] In one embodiment, the clamping and positioning module includes a clamping die base and a positioning assembly, the clamping die base is used to clamp the pipe fitting, the heat dissipation part is a heat dissipation belt, the heat dissipation belt and the pipe body are fixedly assembled by friction, and when the positioning assembly pushes the heat dissipation belt to move inward relative to the pipe body a preset distance, and the molding module moves toward the direction close to the clamping and positioning module, the heat dissipation belt in the pipe body can stop at the end of the core assembly.

[0012] In one embodiment, the length of the tube body protruding from the outer end surface of the clamping die seat along its own length direction is equal to the length of the molding cavity along the moving direction of the core assembly, and the length direction of the tube body is the same as the moving direction of the core assembly.

[0013] In one embodiment, the clamping mold base includes a mold base and a mold cover base that are movably arranged. The mold cover seat and the mold base can cooperate to form a clamping groove for clamping the pipe fitting. The mold cover seat can open the clamping groove relative to the mold base to install or remove the pipe fitting.

[0014] In one embodiment, the positioning assembly includes a positioning baffle and a positioning block. The positioning baffle is arranged on the side of the clamping mold base close to the forming module. The positioning baffle is provided with a positioning hole extending along the length direction of the tube body. The positioning block is movably arranged in the positioning hole. The positioning block can move toward the direction close to the clamping mold base and push the heat dissipation part to move.

[0015] The present application also provides a pipe mouth processing method, which uses the pipe mouth processing mold described in any one of the above embodiments to process the chamfering and shrinking of the pipe fitting.

[0016] The nozzle processing method includes the following steps:

[0017] The clamping and positioning module clamps the pipe fitting; the elastic member applies an elastic force to the core assembly so that the core assembly has a tendency to move toward the direction close to the clamping and positioning module;

[0018] The forming module moves toward the clamping and positioning module until the core assembly stops at the heat dissipation portion in the tube body;

[0019] The molding module continues to move so that the core assembly is subjected to the reaction force from the heat dissipation part and the elastic part is continuously compressed until the molding cavity is sleeved on the outer peripheral side of the tube body, and the inner wall of the molding cavity and the outer wall of the tube body squeeze each other so that the end of the tube body forms a chamfer, and the inner wall of the molding cavity presses the side wall of the tube body toward the outer surface of the core assembly to form a necking at the end of the tube body.

[0020] Compared with the prior art, the pipe orifice processing mold and processing method provided by the present application are such that during processing, the pipe fitting is fixed by the clamping and positioning module, the molding module moves toward the clamping and positioning module, and the core assembly abuts against the end face of the heat dissipation part under the action of elastic force to form an initial support. When pressure continues to be applied, the molding groove gradually wraps around the outer wall of the pipe body, and the external extrusion force is transmitted to the pipe body through the cavity assembly. At this time, the core assembly is compressed by the reaction force of the heat dissipation part, and at the same time, the annular gap formed between its outer wall and the inner wall of the molding groove forces the pipe body material to form a chamfer at the pipe orifice. Since the core assembly always supports the inner wall of the pipe body, the radial component of the external extrusion force is offset by the internal support, thereby preventing the pipe orifice from collapsing.

[0021] Compared to existing technologies, traditional molds rely solely on the external cavity to unidirectionally extrude the tube, lacking internal support and leading to tube wall instability. This solution leverages the synergy between the core assembly and elastic elements to dynamically balance internal and external forces during the extrusion process. The elastic elements allow the core assembly to adjust its position in response to pressure changes while providing continuous support and reaction force, ensuring that the tube remains internally rigidly constrained during the plastic deformation phase, eliminating the risk of collapse.

[0022] Through the above technical solution, this application solves the problem of tube orifice collapse during extrusion molding, achieving a single-step chamfering process with a regular shape, significantly improving the processing yield. Furthermore, the tube orifice processing mold has a compact structure and is suitable for the automated processing of various pipe fittings, such as flat and round tubes, which can improve the production efficiency of plate radiators. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic diagram of the assembly structure of multiple pipe fittings according to an embodiment of the present application;

[0025] Figure 2 A cross-sectional view of a single pipe according to an embodiment of the present application;

[0026] Figure 3 A cross-sectional view of the assembly structure of a clamping and positioning module and a pipe fitting according to an embodiment of the present application;

[0027] Figure 4 A cross-sectional view of a molding module according to an embodiment of the present application;

[0028] Figure 5 This is a cross-sectional view of the partial assembly structure of the clamping and positioning module, the forming module, and the pipe fitting according to an embodiment of the present application.

[0029] Figure numerals: 100, pipe fitting; 110, pipe body; 120, heat dissipation part; 200, clamping and positioning module; 210, clamping mold base; 211, mold base; 212, mold cover base; 220, positioning assembly; 221, positioning baffle; 222, positioning notch; 223, positioning block; 300, molding module; 310, cavity assembly; 311, die base; 312, molding groove; 313, intermediate connecting piece; 314, fixed mold base; 315, movable cavity; 316, molding cavity; 320, core assembly; 321, core body; 322, first fixed plate; 323, second fixed plate; 324, annular protrusion; 330, elastic member. DETAILED DESCRIPTION

[0030] See also Figure 1-Figure 5In one embodiment, the pipe mouth processing mold includes a forming module 300 and a clamping and positioning module 200 that are relatively arranged. During the processing of the pipe fitting 100, the clamping and positioning module 200 is arranged on one side of the forming module 300, and the two are independent modules. Therefore, during the non-processing process, the clamping and positioning module 200 and the forming module 300 can flexibly change their own setting positions.

[0031] Among them, such as Figure 1-Figure 3 As shown, the clamping and positioning module 200 includes a clamping die base 210 and a positioning assembly 220. The clamping die base 210 is used to clamp the pipe fitting 100. The pipe fitting 100 includes a pipe body 110 and a heat dissipation portion 120. The heat dissipation portion 120 is installed inside the pipe body 110. The positioning assembly 220 can push the heat dissipation portion 120 to move inward (away from the pipe mouth) relative to the pipe body 110 by a preset distance. Specifically, the preset distance can be designed to be between 1mm and 5mm. Preferably, the preset distance is in the range of 2mm to 3mm and includes a critical value.

[0032] It should be noted that when the heat dissipation portion 120 is a fixed heat dissipation structure (including but not limited to a bump structure or a horizontal strip structure) provided on the inner wall of the tube body 110, the heat dissipation portion 120 is immovable. Therefore, when the tube 100 is manufactured, the fixed heat dissipation structure needs to be positioned 2 mm to 3 mm away from the end of the tube body 110. In this case, there is no need to provide an additional positioning assembly 220 to push the fixed heat dissipation structure into the tube body 110.

[0033] Furthermore, in one embodiment, if Figure 3 and Figure 5 As shown, the clamping mold base 210 includes a mold base 211 and a mold cover base 212 that are movably arranged. The mold cover base 212 and the mold base 211 can cooperate to form a clamping groove for clamping the pipe fitting 100, and the mold cover base 212 can be opened relative to the mold base 211 to install or remove the pipe fitting 100.

[0034] The mold base 211 is the foundation component used to support the pipe 100. Specifically, it can be implemented as a metal block with grooves. Its surface shape matches the outer contour of the pipe 100 to provide support. The mold cover plate is a covering component that cooperates with the mold base 211 and forms a closed space with the mold base 211 through a closing action. The clamping groove is the space for accommodating the pipe 100 formed by the mold base 211 and the mold cover plate. Specifically, it can be achieved by adjusting the contact surface shape of the mold base 211 and the mold cover plate. Its size is slightly smaller than the outer diameter of the pipe 100 to achieve a clamping function.

[0035] Specifically, the mold base 211 is fixed to the work platform, and the mold cover is connected to the mold base 211 via a hinge, or the two are completely separate. When the pipe 100 needs to be placed, the mold cover rotates around the hinge to open, allowing the operator to place the pipe 100 into the groove of the mold base 211. The mold cover then closes downward, and the raised structure on its inner side forms a closed clamping groove with the groove of the mold base 211, securing the pipe 100 through mechanical pressure. When processing is complete, the mold cover opens again, and the operator can remove the processed pipe 100.

[0036] This solution realizes the rapid opening and closing of the clamping groove through the movable cooperation design of the mold base 211 and the mold cover plate, avoiding the tedious steps of repeatedly disassembling and assembling the clamp.

[0037] However, the present invention is not limited thereto. In other embodiments, the clamping die base 210 may be integrally formed, and the pipe 100 may be inserted into a hole formed at the beginning of the clamping die base 210 .

[0038] In one embodiment, if Figure 3 As shown, the positioning assembly 220 includes a positioning baffle 221 and a positioning block 223. The positioning baffle 221 is arranged on the side of the clamping die base 210 close to the forming module 300. The positioning baffle 221 is provided with a positioning hole extending along the length direction of the tube body 110. The positioning hole and the heat dissipation portion 120 of the pipe fitting 100 are arranged opposite each other. The positioning block 223 is movably arranged in the positioning hole. The positioning block 223 can move toward the direction close to the clamping die base 210 and push the heat dissipation portion 120 to move. Specifically, the positioning block 223 can move toward the direction close to the heat dissipation portion 120 to push the heat dissipation portion 120 to move inward relative to the tube body 110 by a preset distance, or the positioning block 223 can move toward the direction away from the heat dissipation portion 120 to exit the tube body 110.

[0039] It should be noted that the positioning assembly 220 can be positioned using a fixture, and the location of the positioning assembly 220 is moved according to the location of the pipe 100 .

[0040] The positioning baffle 221 is a guide structure used to limit the axial movement path of the positioning block 223. It can be implemented by a metal plate with a through hole, which is fixedly connected to the clamping die base 210 to form a support base. The positioning block 223 is a pushing component that contacts the end face of the heat dissipation portion 120. It can be implemented by a columnar structure, and displacement adjustment is achieved by sliding along the positioning hole. The positioning hole is a straight channel that passes through the positioning baffle 221. It can be implemented by a cylindrical or rectangular channel. Its axis is parallel to the length direction of the tube body 110 to constrain the movement trajectory of the positioning block 223.

[0041] Specifically, after clamping die holder 210 secures tube body 110, the operator drives positioning block 223 along the positioning hole toward clamping die holder 210. The curved contact surface of positioning block 223 abuts the end of heat sink 120, applying a continuous thrust, forcing heat sink 120 to retract axially relative to tube body 110. Because the positioning hole linearly constrains the motion path of positioning block 223, the thrust stroke can be precisely controlled within a preset distance range.

[0042] Compared to existing technologies, traditional molds lack an inward-pushing positioning mechanism for the heat sink 120. Relying solely on the tube body 110 for clamping, it's difficult to control the axial position of the heat sink 120, resulting in uneven force on the tube mouth during extrusion. This solution, through the coordinated action of the positioning baffle 221 and the positioning block 223, proactively adjusts the relative position of the heat sink 120 and the tube body 110 before processing, eliminating molding interference caused by the protrusion of the heat sink 120.

[0043] Furthermore, in one embodiment, Figure 3 As shown, a positioning notch 222 is provided at one end of the positioning baffle 221 facing the clamping die base 210 , and the end surface of the pipe 100 extending out of the clamping die base 210 is stopped by the side wall of the positioning notch 222 .

[0044] This is beneficial to improving the positioning accuracy of the pipe 100.

[0045] like Figure 4 and Figure 5 As shown, the molding module 300 includes a cavity assembly 310, a core assembly 320 and an elastic member 330. The cavity assembly 310 is provided with a movable cavity 315 and a molding groove 312. The molding groove 312 refers to a recessed structure on the cavity assembly 310 for accommodating the end of the tube body 110. Specifically, it can be realized by an arc groove matching the outer diameter of the tube body 110. The inner wall thereof and the outer wall of the core assembly 320 jointly define the chamfered molding space.

[0046] Specifically, the mold cavity assembly 310 includes a die base 311, an intermediate connector 313, and a fixed die base 314. The die base 311 is fixedly connected to the fixed die base 314 via the intermediate connector 313. The connection between the die base 311, the intermediate connector 313, and the fixed die base 314 can be fixed by fasteners, a snap-fit ​​structure, or welding. The specific fixing methods are not listed here. The die base 311 and the fixed die base 314 are spaced apart to form a movable cavity 315. The molding groove 312 is provided at the end of the die base 311 away from the fixed die base 314.

[0047] The die base 311 is a mold component used to accommodate the molding groove 312. The molding groove 312 is formed on the end away from the fixed die base 314 to match the outer wall shape of the tube body 110. The intermediate connector 313 is a transition component used to connect the die base 311 and the fixed die base 314. Specifically, it can be implemented using bolts or locating pins. The distance between the die base 311 and the fixed die base 314 can be controlled by adjusting the length of the intermediate connector 313. The fixed die base 314 is a base component fixedly connected to the other structures of the molding module 300. Specifically, it can be cast from cast iron. The gap between the die base 314 and the die base 311 forms a movable cavity 315 to accommodate the movable space of the elastic member 330 and the core assembly 320.

[0048] Specifically, the die base 311 maintains a fixed distance from the fixed die base 314 through the intermediate connector 313, forming a movable cavity 315. One end of the core assembly 320 can slide axially in the movable cavity 315, and the other end extends outward through the molding groove 312 of the die base 311. That is, one end of the core assembly 320 is movably matched with the cavity assembly 310, and the other end extends toward the side close to the clamping and positioning module 200, wherein the movability of the core assembly 320 and the cavity assembly 310 means that the core assembly 320 can move axially relative to the cavity assembly 310, ensuring the accuracy of the moving trajectory and reducing friction resistance. When the molding module 300 moves toward the clamping and positioning module 200, the core assembly 320 is blocked by the heat dissipation portion 120 inside the tube body 110, generating a reverse force, forcing the core assembly 320 to retract toward the fixed die base 314. At this time, the elastic member 330 is compressed to store energy.

[0049] Specifically, in one embodiment, Figure 4 As shown, the core assembly 320 includes a core body 321, a first fixing plate 322, and a second fixing plate 323. The second fixing plate 323 is connected to one side of the first fixing plate 322 via fasteners. The first fixing plate 322 is provided with a slot extending therethrough. The core body 321 is inserted into the slot and abuts against the second fixing plate 323. In addition, the core body 321 is connected to the second fixing plate 323 via fasteners. When the core assembly 320 and the cavity assembly 310 are movably engaged, the core body 321 is movably inserted into the die seat 311, and one or both of the first fixing plate 322 and the second fixing plate 323 are slidably engaged with the inner wall of the movable cavity 315.

[0050] Among them, the core body 321 refers to the metal component that directly contacts the inner wall of the tube body 110 during the forming process. Specifically, it can be made of high-strength alloy material, and its outer diameter matches the inner diameter of the tube body 110 to form a supporting effect. The first fixed plate 322 refers to a positioning component with a slot, which can be formed into a rectangular through hole by machining to limit the radial displacement of the core body 321. The second fixed plate 323 refers to a supporting component that bears the axial load of the core body 321. Specifically, it can be connected to the first fixed plate 322 by bolts to achieve a detachable connection, which is convenient for later maintenance and replacement. The slot refers to a rectangular opening structure that passes through the first fixed plate 322. Specifically, it can be formed by wire cutting technology. Its size is slightly larger than the cross section of the core body 321 to achieve clearance fit.

[0051] Specifically, after core 321 is inserted into first fixing plate 322 through a slot, its end surface contacts second fixing plate 323 to form axial support. Bolts are then used to secure second fixing plate 323 to first fixing plate 322. This split structure allows for the replacement of worn core 321 without having to replace the entire core assembly 320. During the nozzle extrusion molding process, the surface of core 321 maintains uniform contact with the inner wall of tube body 110, effectively preventing irregular deformation of the end of tube body 110 under the extrusion of molding cavity 316. When performing mold maintenance, core 321 can be removed for surface repair or replacement by simply removing the fasteners of second fixing plate 323.

[0052] Compared to existing technologies, this solution achieves rapid replacement of key components through modular design, significantly reducing mold maintenance costs. While existing fixed structures can easily cause stress concentration and lead to fracture of the core 321, the split connection method improves structural reliability by distributing the load.

[0053] Furthermore, the outer wall of the core assembly 320 close to one end of the clamping and positioning module 200 and the inner wall of the molding groove 312 form a molding cavity 316 for molding the end of the pipe 100 .

[0054] Specifically, it should be noted that the inner wall of the molding groove 312 is inclined, and the outer wall of the core 321 is horizontal. Therefore, the tube body 110 can be processed into a chamfered shape at the outer end in the molding cavity 316 .

[0055] like Figure 4 As shown, one end of the elastic member 330 is connected to the cavity assembly 310 and the other end is connected to the core assembly 320 , and the elastic member 330 can apply elastic force to the core assembly 320 so that the core assembly 320 has a tendency to move toward the direction close to the clamping and positioning module 200 .

[0056] Specifically, in one embodiment, the elastic member 330 includes a plurality of compression springs, one end of which is clamped on the fixed mold base 314 and the other end is clamped on the second fixed plate 323 . The plurality of compression springs are distributed at intervals along the circumference of the movable cavity 315 .

[0057] Among them, circumferentially spaced distribution refers to that multiple compression springs are arranged in a ring shape around the central axis of the movable cavity 315, which can be achieved by a symmetrical layout. For example, a compression spring is arranged at a fixed angle along the circumferential direction to form a uniform elastic support around the core assembly 320.

[0058] Specifically, during the movement of the forming module 300 toward the clamping and positioning module 200, the core assembly 320 is blocked by the heat dissipation portion 120 and generates a reverse force, at which time multiple compression springs are compressed synchronously. Since the springs are evenly arranged along the circumference of the movable cavity 315, the core assembly 320 is subjected to balanced forces in all directions when under pressure, thus avoiding local deformation of the end of the tube body 110 due to single-point force. When the forming cavity 316 completely fits the outer circumference of the tube body 110, the elastic force of the compression spring is evenly transmitted to the inner wall of the tube body 110 through the core assembly 320, offsetting the extrusion stress of the forming cavity 316 on the outer wall of the tube body 110, and preventing the tube mouth from collapsing during the chamfering process.

[0059] In some specific embodiments, the number of compression springs can be four, for example, symmetrically installed at 90-degree intervals within the annular groove of the active cavity 315. The compression springs can be installed between the connecting plate of the core assembly 320 and the die holder 311, for example, by being fixed to the end surface of the fixed die holder 314 of the cavity assembly 310 via a spring seat. The free length of the springs can be adjusted according to the axial travel of the active cavity 315, for example, by using a combination of springs of different wire diameters to accommodate different tube body 110 processing requirements.

[0060] However, the present invention is not limited thereto. In other embodiments, the elastic member 330 may also be a spring or a hydraulic mechanism or other component with a pushing effect, which are not listed here one by one.

[0061] In one embodiment, the maximum length of the core component 320 extending from the outer wall of the cavity component 310 is equal to a predetermined distance.

[0062] Specifically, the core assembly 320 has a tendency to move toward the clamping and positioning module 200 under the action of the elastic member 330. When the molding module 300 moves toward the clamping and positioning module 200, the end of the core assembly 320 contacts the heat dissipation portion 120 in the tube body 110 and forms a support. Because the maximum extension length of the core assembly 320 is equal to the preset distance, it can continuously cover the entire constricted area of ​​the tube body 110 port during the compression of the elastic member 330. Therefore, when the molding cavity 316 presses the outer wall of the tube body 110, a uniform force-bearing contact surface is formed between the outer surface of the core assembly 320 and the inner wall of the tube body 110. During this process, the material at the tube body 110 port is constrained to flow directionally within the gap between the molding cavity 316 and the core assembly 320, ultimately forming a regular and stable chamfered structure.

[0063] However, the present invention is not limited thereto. In other embodiments, the maximum length of the core component 320 extending from the outer wall of the cavity component 310 may also be greater than the preset distance.

[0064] Compared with the prior art, this solution limits the minimum extension length of the core assembly 320 to ensure that the end of the tube body 110 is always effectively supported throughout the entire molding process, thereby significantly improving the stability of molding quality.

[0065] When the molding module 300 moves toward the direction close to the clamping and positioning module 200, and the heat dissipation part 120 in the tube body 110 stops at the end of the core assembly 320, at this time, the core assembly 320 is supported at the port of the tube body 110, and the maximum static friction between the heat dissipation part 120 and the tube body 110 is greater than the elastic force of the elastic member 330. Therefore, even if the molding module 300 continues to move toward the direction close to the clamping and positioning module 200, the core assembly 320 will be in a fixed state because it cannot push the heat dissipation part 120 to move, and the core assembly 320 can continuously compress the elastic member 330 under the reaction force from the heat dissipation part 120 until the molding cavity 316 is sleeved on the outer peripheral side of the tube body 110, and the inner wall of the molding cavity 316 can be squeezed against the outer wall of the tube body 110 to form a chamfer at the end of the tube body 110.

[0066] Specifically, during processing, the pipe fitting 100 is fixed by the clamping die base 210, and the positioning assembly 220 pushes the heat dissipation portion 120 inward to release the end space of the tube body 110. The molding module 300 moves toward the clamping and positioning module 200, and the core assembly 320 abuts the end face of the heat dissipation portion 120 under the action of elastic force to form an initial support. When pressure continues to be applied, the molding groove 312 gradually wraps around the outer wall of the tube body 110, and the external extrusion force is transmitted to the tube body 110 through the cavity assembly 310. At this time, the core assembly 320 is compressed by the reaction force of the heat dissipation portion 120, and the annular gap formed between its outer wall and the inner wall of the molding groove 312 forces the tube body 110 material to form a chamfer at the pipe mouth. Since the core assembly 320 always supports the inner wall of the tube body 110, the radial component of the external extrusion force is offset by the internal support, thereby preventing the pipe mouth from collapsing.

[0067] Compared to existing technologies, traditional molds rely solely on the external cavity to unidirectionally extrude the tube body 110, lacking internal support and leading to tube wall instability. This solution dynamically balances internal and external forces during the extrusion process through the synergistic effect of the core assembly 320 and the elastic member 330. The elastic member 330 allows the core assembly 320 to adjust its position in response to pressure changes while continuously providing a supporting reaction force, ensuring that the tube body 110 remains internally rigidly constrained during the plastic deformation phase, thereby eliminating the risk of collapse.

[0068] Through the above-mentioned technical solution, this application solves the problem of nozzle collapse during extrusion molding, achieving a single-step chamfer with a regular shape, significantly improving the processing yield. Furthermore, the positioning assembly 220 pre-adjusts the position of the heat dissipation portion 120 to prevent interference with the molding process and ensure consistent chamfer depth. This nozzle processing mold has a compact structure and is suitable for the automated processing of various pipe fittings 100, including flat and round tubes, thereby improving the production efficiency of plate-type radiators.

[0069] Furthermore, in one embodiment, if Figure 5 As shown, an annular protrusion 324 is provided on the outer circumference of one end of the core assembly 320 near the clamping and positioning module 200. The inner ring of the annular protrusion 324 is fixedly connected to the outer circumference of the core assembly 320, and the outer ring of the annular protrusion 324 protrudes radially from the surface of the core assembly 320 along the radial direction of the core assembly 320. In other words, the annular protrusion 324 refers to an annular protruding structure provided on the outer circumference of the core assembly 320. The inner ring of the annular protrusion 324 is fixed to the surface of the core assembly 320 by welding or integral molding, and the outer ring diameter is larger than the diameter of the core assembly 320 itself. The annular protrusion 324 provides radial support when the tube body 110 is deformed under pressure, preventing the tube mouth from collapsing. The movable support fit means that the outer ring of the annular protrusion 324 contacts the inner wall of the tube body 110 but is not completely fixed, allowing the tube body 110 to produce slight axial displacement when under pressure. The spacing setting means that a gap is reserved between the outer wall of the core assembly 320 and the inner wall of the tube body 110, so as to provide space for the tube body 110 to shrink and deform when being squeezed.

[0070] Furthermore, when the core assembly 320 is inserted into the tube body 110 and abuts the heat dissipation portion 120, the outer ring of the annular protrusion 324, which is away from the core assembly 320, can be movably supported and cooperated with the inner wall of the tube body 110, and the surface of the core assembly 320 is spaced apart from the inner wall of the tube body 110. When the molding cavity 316 is sleeved on the outer circumference of the tube body 110, the inner wall of the molding cavity 316 can compress the side wall of the tube body 110 toward the center of the tube body 110 and abut against the surface of the core assembly 320, thereby forming a constricted end of the tube body 110.

[0071] Specifically, an annular protrusion 324 is provided on the outer circumference of the core 321, away from the first fixing plate 322. The inner ring of the annular protrusion 324 is fixedly connected to the outer circumference of the core 321, and the outer ring of the annular protrusion 324 protrudes from the surface of the core 321 in the radial direction of the core 321. When the core 321 is inserted into the tube 110 and abuts the heat dissipation portion 120, the outer ring of the annular protrusion 324, away from the core 321, can flexibly support and cooperate with the inner wall of the tube 110, and the surface of the core 321 is spaced apart from the inner wall of the tube 110. When the molding cavity 316 is sleeved on the outer circumference of the tube 110, the inner wall of the molding cavity 316 can compress the side wall of the tube 110 toward the outer surface of the core 321, thereby forming a constricted end of the tube 110.

[0072] After the tube body 110 is fixed by the clamping mold base 210, the core assembly 320 moves forward under the action of the elastic member 330 and is inserted into the interior of the tube body 110. The outer ring of the annular protrusion 324 contacts the inner wall of the tube body 110 to form a support. At this time, an annular gap is formed between the core assembly 320 body and the inner wall of the tube body 110. When the molding module 300 continues to move so that the molding cavity 316 wraps the outer wall of the tube body 110, the tube body 110 is squeezed by the inner wall of the molding cavity 316, and its side wall shrinks toward the center. Because the annular protrusion 324 prevents the inner wall of the tube body 110 from being excessively concave, the material of the tube body 110 is uniformly deformed during the extrusion process, and finally fits the outer wall of the core assembly 320 to form a regular necking.

[0073] In one embodiment, if Figure 3 and Figure 4As shown, the length of the tube body 110 protruding from the outer end surface of the clamping die holder 210 along its own length (indicated by B in the drawings) is equal to the length of the molding cavity 316 along the direction of movement of the core assembly 320 (indicated by A in the drawings). The length of the tube body 110 protruding from the outer end surface of the clamping die holder 210 along its own length refers to the dimension of the exposed portion of the tube body 110 not covered by the clamping die holder 210 extending along its axis. This can be achieved by adjusting the clamping position of the tube body 110 during machining, which helps to accurately control the effective processing area of ​​the tube body 110 within the molding cavity 316. The length of the molding cavity 316 along the direction of movement of the core assembly 320 refers to the spatial extension of the molding cavity 316 along the axial movement path of the core assembly 320. This can be achieved by matching the relative positions of the cavity assembly 310 and the clamping and positioning module 200. This ensures that the exposed portion of the tube body 110 completely enters the molding cavity 316 for deformation processing.

[0074] Furthermore, the longitudinal direction of the tube body 110 is the same as the moving direction of the core assembly 320. The fact that the moving direction of the core assembly 320 is the same as the longitudinal direction of the tube body 110 means that the core assembly 320 moves parallel to the axis of the tube body 110 during the molding process. Specifically, the consistency of the movement trajectories of the two can be maintained by providing a guide mechanism, which helps prevent the tube body 110 from deflecting during the extrusion process. Therefore, when the outer end face of the cavity assembly 310 abuts against the outer end face of the clamping die base 210, the end of the tube body 110 close to the molding module 300 just abuts against the end of the molding cavity 316 away from the clamping and positioning module 200. At this time, the inner wall of the molding cavity 316 can form a chamfer on the end of the tube body 110.

[0075] Specifically, after the clamping and positioning module 200 clamps the pipe 100, the length of the exposed section of the pipe body 110 extending beyond the clamping die base 210 is precisely configured to be equal to the length of the molding cavity 316 along the direction of movement of the core assembly 320. When the molding module 300 moves toward the clamping and positioning module 200, the core assembly 320 is always in close contact with the end of the pipe body 110 due to the action of the elastic member 330. At this time, the exposed section of the pipe body 110 just completely enters the molding cavity 316, and the inner wall of the molding cavity 316 uniformly squeezes the outer circumference of the pipe body 110. Because the core assembly 320 and the pipe body 110 maintain coaxial movement, under the state of axial force balance, the material at the end of the pipe body 110 is restricted by the molding cavity 316 and flows evenly in the radial direction, thereby forming a regular chamfered structure.

[0076] This solution limits the exposed section of the tube body 110 to be equal in length to the molding cavity 316 and their movement directions to be consistent, so that the end of the tube body 110 is subjected to symmetrically distributed extrusion pressure during the entire molding process, effectively suppressing irregular flow of the material.

[0077] Furthermore, the present invention ensures that the stress-bearing area of ​​the tube body 110 end within the forming cavity 316 is fully covered and evenly distributed, avoiding collapse defects caused by localized stress concentration. The coaxial motion design further eliminates lateral deviation of the material during the extrusion process, significantly improving the chamfer forming accuracy and surface quality.

[0078] However, the present invention is not limited thereto. In other embodiments, the length of the tube body 110 protruding from the outer end surface of the clamping die holder 210 along its own length direction may also be smaller than the length of the molding cavity 316 along the moving direction of the core assembly 320 .

[0079] The present application also provides a pipe mouth processing method, which uses the pipe mouth processing mold described in any one of the above embodiments to process the chamfering and shrinking of the pipe fitting 100.

[0080] The nozzle processing method includes the following steps:

[0081] The clamping die base 210 clamps the pipe fitting 100;

[0082] The positioning assembly 220 pushes the heat dissipation portion 120 to move inward relative to the tube body 110 by a preset distance;

[0083] The elastic member 330 applies elastic force to the core assembly 320 so that the core assembly 320 tends to move toward the direction close to the clamping and positioning module 200;

[0084] The molding module 300 moves toward the clamping and positioning module 200 until the core assembly 320 stops at the heat dissipation portion 120 in the tube body 110 ;

[0085] The molding module 300 continues to move, so that the core assembly 320 is subjected to the reaction force from the heat dissipation portion 120 and the elastic member 330 is continuously compressed until the molding cavity 316 is sleeved on the outer circumference of the tube body 110. The inner wall of the molding cavity 316 and the outer wall of the tube body 110 are squeezed against each other, so that the end of the tube body 110 is chamfered. In addition, the inner wall of the molding cavity 316 compresses the side wall of the tube body 110 toward the outer surface of the core assembly 320, so that the end of the tube body 110 is constricted.

[0086] Afterwards, the molding module 300 retracts, and the core assembly 320 moves forward under the action of the elastic member 330 until the core assembly 320 abuts against the bottom wall of the movable cavity 315 ;

[0087] The molding module 300 continues to retreat, the core body 321 of the core assembly 320 exits the tube body 110, and the molding module 300 is reset;

[0088] The mold cover seat 212 is moved upward and opened, and the pipe 100 is taken out. At this point, the chamfering process of one end of the pipe 100 is completed.

[0089] Repeat the above steps to perform the chamfering process on the other end of the pipe 100 or the chamfering process on another pipe 100 .

[0090] Compared to existing technologies, traditional die extrusion processes rely solely on a single stamping process, resulting in a lack of internal support at the tube mouth, which can easily lead to collapse. This method utilizes the core assembly 320 and the heat sink 120 to form an internal support structure. During the closing process of the molding cavity 316, the elastic member 330 is gradually compressed. This ensures that the extrusion deformation of the outer wall of the tube body 110 is always limited by the internal rigid structure, preventing irregular material flow. Furthermore, the cushioning effect of the elastic member 330 reduces the risk of damage to the tube body 110 structure caused by instantaneous impact forces.

[0091] Through the above-mentioned technical solution, this application solves the problem of collapse and deformation during the tube nozzle extrusion molding process, ensuring that the chamfer and necking dimensions meet design requirements. The combination of the position adjustment of the heat dissipation portion 120 and the elastic support of the core assembly 320 ensures that the end of the tube body 110 deforms uniformly under bidirectional forces, improving processing yield and product consistency, making it suitable for the mass production of flat tube parts.

[0092] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of patent protection for the present application shall be determined by the appended claims.

[0094] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0095] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0096] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0097] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0098] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0099] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are intended only to describe specific embodiments and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

Claims

1. A pipe nozzle processing mold, characterized in that: The invention comprises a forming module (300) and a clamping and positioning module (200), wherein the clamping and positioning module (200) is used for clamping a pipe fitting (100), wherein the pipe fitting (100) comprises a pipe body (110) and a heat dissipation portion (120), and the heat dissipation portion (120) is installed inside the pipe body (110); The molding module (300) comprises a cavity assembly (310), a core assembly (320) and an elastic member (330); the cavity assembly (310) is provided with a molding groove (312); one end of the core assembly (320) is movably matched with the cavity assembly (310), and the other end extends toward a side close to the clamping and positioning module (200); the outer wall of the core assembly (320) and the inner wall of the molding groove (312) form a molding cavity (316) for molding the port of the pipe fitting (100); The elastic member (330) is capable of applying elastic force to the core assembly (320), so that the core assembly (320) has a tendency to move toward a direction close to the clamping and positioning module (200); When the molding module (300) moves toward the direction approaching the clamping and positioning module (200), and the heat dissipation portion (120) in the tube body (110) stops at the end of the core assembly (320), the core assembly (320) is supported and arranged at the end of the tube body (110), and the core assembly (320) can compress the elastic member (330) until the molding cavity (316) is sleeved on the outer peripheral side of the tube body (110), and the outer wall of the tube body (110) can be squeezed in the molding cavity (316) and form a chamfer.

2. The nozzle processing mold according to claim 1, characterized in that: An annular protrusion (324) is provided on the outer peripheral side of the core component (320) close to one end of the clamping and positioning module (200); When the core assembly (320) is inserted into the tube body (110) and abuts against the heat dissipation portion (120), the annular protrusion (324) is away from the outer ring of the core assembly (320) and can be movably supported and matched with the inner wall of the tube body (110), and the surface of the core assembly (320) and the inner wall of the tube body (110) are spaced apart. When the molding cavity (316) is sleeved on the outer peripheral side of the tube body (110), the inner wall of the molding cavity (316) can compress the side wall of the tube body (110) to shrink toward the center of the tube body (110) and abut against the surface of the core assembly (320), so that the end of the tube body (110) forms a constriction.

3. The nozzle processing mold according to claim 1, characterized in that: The maximum length of the core component (320) extending from the outer wall of the cavity component (310) is greater than or equal to a preset distance.

4. The nozzle processing mold according to claim 1, characterized in that: The cavity assembly (310) comprises a die base (311), an intermediate connecting piece (313) and a fixed die base (314); the die base (311) is fixedly connected to the fixed die base (314) via the intermediate connecting piece (313); the die base (311) and the fixed die base (314) are spaced apart to form a movable cavity (315); the molding groove (312) is provided at one end of the die base (311) away from the fixed die base (314); one end of the core assembly (320) is movably provided in the movable cavity (315), and the other end is movably provided in the die base (311) and passes through the outer wall of the die base (311) through the molding groove (312).

5. The nozzle processing mold according to claim 1, characterized in that: The core assembly (320) includes a core body (321), a first fixing plate (322) and a second fixing plate (323), wherein the second fixing plate (323) is connected to one side of the first fixing plate (322) via a fastener, and the first fixing plate (322) is provided with a through-set slot, and the core body (321) is inserted into the slot and abuts against the second fixing plate (323), and the core body (321) is connected to the second fixing plate (323) via a fastener.

6. The nozzle processing mold according to claim 1, characterized in that: The clamping and positioning module (200) comprises a clamping die base (210) and a positioning assembly (220), wherein the clamping die base (210) is used to clamp the pipe fitting (100), the heat dissipation portion (120) is a heat dissipation belt, and the heat dissipation belt and the pipe body (110) are fixedly assembled by friction, and when the positioning assembly (220) pushes the heat dissipation belt to move inwardly relative to the pipe body (110) by a preset distance, and the molding module (300) moves in a direction close to the clamping and positioning module (200), the heat dissipation belt in the pipe body (110) can be stopped at the end of the core assembly (320).

7. The nozzle processing mold according to claim 6, characterized in that: The length of the tube body (110) protruding from the outer end surface of the clamping die seat (210) along its own length direction is equal to the length of the molding cavity (316) along the moving direction of the core assembly (320), and the length direction of the tube body (110) is the same as the moving direction of the core assembly (320).

8. The nozzle processing mold according to claim 6, characterized in that: The clamping die base (210) comprises a die base (211) and a die cover base (212) that are movably matched. The die cover base (212) and the die base (211) can cooperate to form a clamping groove for clamping the pipe fitting (100). The die cover base (212) can open the clamping groove relative to the die base (211) to install or remove the pipe fitting (100).

9. The nozzle processing mold according to claim 6, characterized in that: The positioning assembly (220) comprises a positioning baffle (221) and a positioning block (223); the positioning baffle (221) is arranged on a side of the clamping die base (210) close to the forming module (300); the positioning baffle (221) is provided with a positioning hole extending along the length direction of the tube body (110); the positioning block (223) is movably arranged in the positioning hole; the positioning block (223) can move toward a direction close to the clamping die base (210) and push the heat dissipation part (120) to move.

10. A pipe mouth processing method, characterized in that: The pipe opening processing mold according to any one of claims 1 to 9 is used to process the chamfering and shrinking of a pipe fitting (100), and the pipe opening processing method includes the following steps: The clamping and positioning module (200) clamps the pipe (100); the elastic member (330) applies elastic force to the core assembly (320), so that the core assembly (320) has a tendency to move toward a direction close to the clamping and positioning module (200); The molding module (300) moves toward the direction close to the clamping and positioning module (200) until the core assembly (320) stops at the heat dissipation portion (120) in the tube body (110); The molding module (300) continues to move so that the core assembly (320) is subjected to the reaction force from the heat dissipation portion (120) and the elastic member (330) is continuously compressed until the molding cavity (316) is sleeved on the outer peripheral side of the tube body (110), and the inner wall of the molding cavity (316) and the outer wall of the tube body (110) are squeezed against each other so that the end of the tube body (110) forms a chamfer, and the inner wall of the molding cavity (316) presses the side wall of the tube body (110) toward the outer surface of the core assembly (320) so that the end of the tube body (110) forms a constriction.

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