A multi-tube bending process and tooling used

Abstract

The application provides a multi-pipe bending press forming process and a tool used thereby, and belongs to the technical field of automobile parts. The application comprises the following steps: S1, machining of a main pipe and a manifold; S2, spot welding; S3, brazing; and S4, press bending; and a tool comprising a base plate, a moving frame, a mold closing driver, a mold clamp and a plurality of bending pipe drivers is arranged. The plurality of straight manifolds are first spot welded and brazed on the main pipe, then the main pipe with the plurality of straight manifolds is clamped by the mold clamp driven by the mold closing driver, the manifolds are limited by the mold groove of the mold clamp, and one manifold corresponds to one bending pipe driver, and finally the end portions of the plurality of straight manifolds are synchronously press bent by the plurality of bending pipe drivers, so that one-time press bending machining of the plurality of manifolds is realized, the standardization of the press bending machining is ensured, the manifolds do not need to be reshaped after being press bent, the press bending is the final process, the machining steps are reduced, the product consistency is higher, the product machining efficiency is improved, and the product machining benefit is improved.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, specifically to a multi-tube bending forming process and the tooling used therein. Background Technology

[0002] Automotive piping systems, including fuel lines and air conditioning lines, are crucial structures for ensuring normal vehicle operation. Currently, existing automotive piping systems on the market include a multi-pipe structure, where a main pipe has several manifolds, each connected to the main pipe. Different manifolds are bent according to different installation requirements; that is, some or all manifolds may bend in the same or different directions at their ends. This process is difficult to manufacture and quality is hard to guarantee. Therefore, improving the manufacturing quality of multi-pipe structures has become a key focus in the industry.

[0003] Currently, the existing process for processing multi-pipe structures involves first bending multiple manifolds according to requirements, drilling holes in the main pipe, then inserting one end of the manifold into the corresponding hole on the main pipe and spot welding it for pre-fixation, and finally brazing the pre-fixed pipes together to ensure complete welding between the manifold and the main pipe. However, in actual processing, this method of bending before welding can easily lead to misalignment of the bending direction. Furthermore, due to the small diameter of the manifold, it is prone to deformation during welding. Therefore, a shaping process is required after brazing to reshape the welded product, increasing the number of processing steps, reducing processing efficiency, and impacting processing profitability. Summary of the Invention

[0004] To address the aforementioned problems in existing technologies, this paper aims to provide a multi-pipe bending forming process and the tooling used therein. First, straight manifolds are welded to the main pipe. Then, the main pipe and manifolds, both entirely straight, are placed in the bending tooling. After the tooling is closed, the ends of the manifolds are bent using a bending drive. This tooling enables the bending of multiple manifolds in a single process. Furthermore, the bending tooling results in better product consistency, eliminates the need for additional shaping processes, reduces processing steps, improves processing efficiency, and effectively increases product processing benefits.

[0005] The specific technical solution is as follows: A multi-tube bending forming process includes the following steps: Step S1: Processing of main pipes and manifolds; Cut the main pipe and manifold to the required length, and make several connection holes on the main pipe wall that correspond to the manifold. Step S2, spot welding; Insert one end of the manifold into the corresponding connection hole on the main pipe and spot weld it. Then, put an installation block on one end of the main pipe and spot weld it together. Step S3, brazing; The spot-welded main pipe and manifold, as well as the main pipe and mounting block, are brazed to obtain a straight pipe semi-finished product. Step S4, bending; The straight pipe semi-finished product is placed into the bending fixture. The main pipe and each manifold are clamped by the clamping mold of the bending fixture. Then, the end of the corresponding manifold is bent by the bending drive with the bend in the bending fixture to obtain the multi-pipe bent product.

[0006] In the above-mentioned multi-pipe bending forming process, the mounting block is a sheet-like structure with several mounting holes. The mounting block is also provided with a set of holes. One end of the main pipe is inserted into the set of holes and then welded to the mounting block. The mounting block is processed simultaneously in step S1.

[0007] A tooling for a multi-tube bending forming process, used in step S4 of claim 1 or 2, is characterized by comprising: The base plate has mounting vertical plates at both ends, and a guide rail is installed on the base plate between the two mounting vertical plates. Each mounting vertical plate has a corresponding movable frame, and both movable frames are slidably mounted on the guide rail. A mold closing driver is installed on each of the two mounting vertical plates, and the mold closing driver is poweredly connected to the corresponding moving frame. The clamping mold includes a first half mold and a second half mold. The first half mold and the second half mold are respectively installed on opposite sides of two movable frames. Furthermore, the clamping mold has several mold slots corresponding to the main pipe and the manifold, and each mold slot is divided into two half slots and respectively set on the first half mold and the second half mold. Several pipe bending drive components, each including a telescopic actuator and an elbow, several telescopic actuators are respectively set on two movable frames, and one telescopic actuator corresponds to one mold groove corresponding to the manifold, and the elbow is slidably set on the first half mold or the second half mold and connected to the corresponding telescopic actuator.

[0008] The tooling used in the above-mentioned multi-pipe bending forming process has a bending groove on the end and / or side of the elbow, and when the elbow contacts the end of the manifold to be bent, the end of the manifold is inserted into the bending groove of the corresponding elbow.

[0009] The tooling used in the above-mentioned multi-pipe bending forming process includes a straight groove and a curved groove for each manifold. One end of the straight groove is connected to the manifold corresponding to the corresponding groove, and the other end is connected to the corresponding curved groove. The corresponding elbow is slidably disposed at the connection between the straight groove and the curved groove.

[0010] The tooling used in the above-mentioned multi-pipe bending forming process includes a concave rotating groove coaxially formed on the bottom of one half of the mold groove corresponding to the main pipe. Two arc-shaped rotating sleeves are coaxially arranged in the rotating groove. The two arc-shaped rotating sleeves are arranged side by side along the axial direction of the half groove, and both arc-shaped rotating sleeves rotate circumferentially within the rotating groove. A telescopic spring is provided between the two arc-shaped rotating sleeves and the bottom of the corresponding rotating groove. One side of one arc-shaped rotating sleeve selectively extends out of the half groove from one side of the rotating groove, and the other side of the other arc-shaped rotating sleeve selectively extends out of the half groove from the other side of the rotating groove. At the same time, a first trigger switch is provided between each arc-shaped rotating sleeve and the rotating groove, and the first trigger switch is electrically connected to an external display circuit.

[0011] The tooling used in the above-mentioned multi-pipe bending forming process includes a limiting half-ring on the outer wall of each arc-shaped rotating sleeve. Two recessed limiting grooves are spaced apart along the axial direction on the bottom of the rotating groove, and both limiting grooves are arranged circumferentially along the rotating groove. Furthermore, the cross-sections of the limiting grooves and the limiting half-rings are arranged in a "T" shape, and the two limiting half-rings are slidably placed in the two limiting grooves respectively.

[0012] The tooling used in the above-mentioned multi-tube bending forming process includes a first insertion hole on the end face of the limiting semi-ring and located on the side of the arc-shaped rotating sleeve that selectively extends into the semi-groove. At the same time, a second insertion hole is provided at one end of the corresponding limiting groove. The two ends of the telescopic spring extend into the first insertion hole and the second insertion hole respectively. Furthermore, a first trigger switch is provided in the second insertion hole and abuts against the telescopic spring.

[0013] The tooling used in the above-mentioned multi-tube bending forming process further includes a second trigger switch, which is electrically connected to an external display circuit. Each limiting half-ring has a push rod on the end face where the first insertion hole is provided. At the same time, a recessed hole is opened at the end of the corresponding limiting groove where the second insertion hole is provided. The second trigger switch is installed in the recessed hole. When one side of the arc-shaped rotating sleeve does not extend out of the half-groove, the end of the push rod abuts against the second trigger switch.

[0014] The tooling used in the above-mentioned multi-pipe bending forming process includes an extension arm provided on one side of each arc-shaped rotating sleeve that selectively extends out of the half-groove and is close to the end of another arc-shaped rotating sleeve. One side of the extension arm is flush with the side of the corresponding arc-shaped rotating sleeve that selectively extends out of the half-groove, and the other side of the extension arm is located in the rotating groove. At the same time, when one side of the arc-shaped rotating sleeve extends out of the half-groove, there is a gap between the side of the extension arm located in the rotating groove and the other arc-shaped rotating sleeve. Furthermore, when one side of the arc-shaped rotating sleeve does not extend out of the half-groove, the side of the extension arm located in the rotating groove abuts against the other arc-shaped rotating sleeve.

[0015] The positive effects of the above technical solution are: The aforementioned multi-pipe bending forming process and the tooling used first braze several straight manifolds onto the main pipe. Then, the clamping driver in the bending tooling drives the clamping die to clamp the main pipe with several straight manifolds. Finally, several bending drive components in the bending tooling, each corresponding to a manifold, simultaneously bend the ends of the straight manifolds. This process can bend multiple manifolds at once, improving processing efficiency while ensuring the standard of the final processed state. It avoids the need for additional shaping processes later, resulting in fewer processing steps, higher product consistency, and effectively improved product processing efficiency, leading to higher product processing benefits. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a conventional multi-pipeline structure according to the present invention; Figure 2 This is a flowchart of a multi-tube bending forming process according to the present invention; Figure 3 This is a structural diagram of an embodiment of the tooling used in a multi-tube bending forming process according to the present invention; Figure 4 This is a structural diagram of the first half-mold of a preferred embodiment of the present invention; Figure 5 This is a structural diagram of a pipe bending drive component according to a preferred embodiment of the present invention; Figure 6 for Figure 4 Enlarged view of section A; Figure 7 This is a structural diagram of the arc-shaped rotating sleeve according to a preferred embodiment of the present invention; Figure 8 This is a schematic diagram of the installation of the first trigger switch, the second trigger switch, the telescopic spring, and the push rod according to a preferred embodiment of the present invention.

[0017] In the attached diagram: 1. Main pipe; 2. Manifold; 3. Mounting block; 4. Base plate; 41. Mounting vertical plate; 42. Guide rail; 5. Moving frame; 6. Mold closing driver; 7. Mold clamping; 71. First half mold; 72. Second half mold; 73. Mold groove; 74. Rotating groove; 731. Straight groove section; 732. Bending groove section; 741. Limiting groove; 7411. Second insertion hole; 7412. Embedded hole; 8. Bending pipe driver; 81. Telescopic driver; 82. Elbow; 821. Pressing bending groove; 9. Arc-shaped rotating sleeve; 91. Telescopic spring; 92. First trigger switch; 93. Limiting half ring; 94. Second trigger switch; 95. Extension arm; 931. First insertion hole; 932. Push rod. Detailed Implementation

[0018] To make the technical means, creative features, objectives, and effects of this invention easier to understand, the following embodiments are provided in conjunction with the appendix. Figure 1 To be continued Figure 8 The technical solutions provided by this invention are described in detail, but the following content is not intended to limit this invention.

[0019] Figure 1 This is a schematic diagram of a conventional multi-pipeline structure according to the present invention. The product to be processed in this embodiment is a main pipe 1 with several manifolds 2 arranged at intervals on its side wall. The manifolds 2 are bent in the same or different directions away from the end connected to the main pipe 1. At the same time, a mounting block 3 is fixedly sleeved on one end of the main pipe 1.

[0020] Figure 2 This is a flow chart of a multi-tube bending forming process according to the present invention. Figure 2 As shown, the multi-tube bending forming process provided in this embodiment includes the following steps: Step S1: Processing of main pipe 1 and manifold 2; The main pipe 1 and manifold 2 are cut to the required length for later use. Furthermore, several connection holes corresponding to manifold 2 are made on the wall of the main pipe 1 using a drilling device, which provides the conditions for the subsequent connection of each manifold 2 to the main pipe 1 and the conduction between the manifold 2 and the main pipe 1.

[0021] Step S2, spot welding; To temporarily fix the manifold 2 to the main pipe 1, first insert one end of the manifold 2 into the corresponding connection hole on the main pipe 1, and then spot weld the manifold 2 inserted into the connection hole to the connection point of the main pipe 1 using a spot welding machine. After the manifold 2 is spot welded, then put an installation block 3 on one end of the main pipe 1, and spot weld the installation block 3 to the main pipe 1 using the same spot welding machine to achieve temporary fixation of the installation block 3 on the main pipe 1.

[0022] Step S3, brazing; After spot welding, the main pipe 1 and manifold 2, as well as the main pipe 1 and the mounting block 3, are brazed to completely weld the gap between the main pipe 1 and manifold 2 and the gap between the mounting block 3 and the main pipe 1, ensuring the complete connection of the manifold 2 and the mounting block 3 on the main pipe 1, thus obtaining a straight pipe semi-finished product, that is, both the main pipe 1 and the manifold 2 are straight pipes.

[0023] Step S4, bending; The semi-finished straight pipe is placed into the bending fixture. The clamping mold 7 of the bending fixture clamps both the main pipe 1 and each manifold 2, thus stably clamping both the main pipe 1 and each manifold 2. Then, the bending drive 8 with an elbow 82 in the bending fixture bends the end of the corresponding manifold 2. At this time, the bending drive pushes the elbow 82 to move relative to the end of the manifold 2, and the elbow 82 pushes the end of the manifold 2 to bend, thus meeting the bending requirements of the manifold 2 and obtaining a multi-pipe bent finished product. Since multiple bending drive 8s can operate simultaneously, synchronous bending of multiple manifolds 2 is achieved, improving processing efficiency. At the same time, bending by clamping mold 7 eliminates the need for subsequent shaping, reducing processing steps and ensuring product consistency, thereby increasing product value.

[0024] More specifically, the mounting block 3 located at one end of the main pipe 1 is a plate-like structure with several mounting holes. The mounting position and number of mounting holes on the mounting block 3 can be selected according to usage requirements. Furthermore, a set of holes is also provided on the mounting block 3, allowing one end of the main pipe 1 to be inserted into the set of holes before welding it to the mounting block 3 when installing the mounting block 3 onto the main pipe 1. Additionally, the machining of the mounting block 3 can be performed simultaneously with the machining of the main pipe 1 and the manifold 2 in step S1 described above.

[0025] In addition, this embodiment also provides a bending fixture for the bending operation in step S4 above. Figure 3 This is a structural diagram of an embodiment of the tooling used in a multi-tube bending forming process according to the present invention. Figure 3 As shown, the tooling used in a multi-pipe bending forming process includes a base plate 4, a movable frame 5, a mold closing driver 6, a clamping mold 7, and several bending drive components 8. By installing the movable frame 5 on the base plate 4 and installing the clamping mold 7 on the movable frame 5, and by pushing the movable frame 5 through the mold closing driver 6, the clamping mold 7 can be closed and opened. In addition, the bending drive components 8 are used to perform bending operations on the manifold 2 that needs to be bent, so as to realize the synchronous bending processing of multiple pipes.

[0026] Specifically, the base plate 4 is a strip plate, with upward-facing mounting vertical plates 41 at both ends, creating a gap between the two mounting vertical plates 41 to provide space for the subsequent installation and movement of the moving frame 5 and the clamping mold 7. Simultaneously, a guide rail 42 is also installed on the base plate 4 between the two mounting vertical plates 41. The guide rail 42 is arranged in the same direction as the base plate 4, guiding the movement of the moving frame 5 and the clamping mold 7, improving the stability of the clamping mold 7 during movement, and resulting in a more rational structural design.

[0027] Specifically, the movable frame 5 is positioned between the two mounting vertical plates 41, and each mounting vertical plate 41 corresponds to one movable frame 5, resulting in two movable frames 5. Both movable frames 5 are slidably mounted on the guide rail 42, providing conditions for the two movable frames 5 to move closer or further apart, and also providing conditions for the mold clamp 7 to be closed or opened by the movable frame 5.

[0028] Specifically, a mold clamping driver 6 is installed on each of the two mounting vertical plates 41. The mounting vertical plates 41 provide a stable mounting carrier for the mold clamping driver 6. Furthermore, the mold clamping driver 6 is powered to the corresponding moving frame 5. Preferably, the mold clamping driver 6 is a telescopic cylinder. The drive shaft of the mold clamping driver 6 moves telescopically along the guide rail 42. The drive shaft of the mold clamping driver 6 is connected to the corresponding moving frame 5. The mold clamping driver 6 drives the moving frame 5 to slide on the guide rail 42, providing power for the subsequent mold clamping and opening of the mold 7.

[0029] Figure 4 This is a structural diagram of the first half-mold of a preferred embodiment of the present invention. Figure 3 and Figure 4 As shown, the clamping mold 7 is divided into a first half mold 71 and a second half mold 72. The first half mold 71 and the second half mold 72 are respectively installed on opposite sides of two movable frames 5. When the two movable frames 5 approach each other, the first half mold 71 and the second half mold 72 move closer together and fit together, thus completing the mold-closing operation of the first half mold 71 and the second half mold 72. When the two movable frames 5 move away from each other, the first half mold 71 and the second half mold 72 move away from each other, thus completing the opening of the first half mold 71 and the second half mold 72. Furthermore, the clamping mold 7 has several mold grooves 73 corresponding to the main pipe 1 and the manifold 2, so that when the clamping mold 7 is closed, the main pipe 1 and the manifold 2 can be located in their respective mold grooves 73, restricting the displacement of the main pipe 1 and the manifold 2. This provides conditions for subsequent bending of the end of the manifold 2, preventing deformation of other parts of the main pipe 1 and the manifold 2. Since the clamping mold 7 is divided into a first half mold 71 and a second half mold 72, each mold groove 73 is divided into two half grooves and respectively set on the first half mold 71 and the second half mold 72. That is, when the first half mold 71 and the second half mold 72 are separated, the mold groove 73 will be opened, which facilitates the loading and unloading of the main pipe 1 and the manifold 2, and makes loading and unloading more convenient.

[0030] Figure 5 This is a structural diagram of a pipe bending drive component according to a preferred embodiment of the present invention. Figure 3 , Figure 4 as well as Figure 5As shown, each movable frame 5 is also provided with several pipe bending drive components 8. At this time, each pipe bending drive component 8 includes a telescopic driver 81 and a bend 82. The bend 82 is moved by the telescopic driver 81. Preferably, the telescopic driver 81 is also a telescopic cylinder. Furthermore, several telescopic actuators 81 are respectively set on two movable frames 5, and one telescopic actuator 81 corresponds to one mold groove 73 corresponding to the manifold 2. That is, according to the arrangement position of the manifold 2, the corresponding telescopic actuator 81 is installed on the corresponding movable frame 5. The elbow 82 is slidably placed on the first half mold 71 or the second half mold 72 and connected to the corresponding telescopic actuator 81, so that the end of the elbow 82 can extend into the mold groove 73 of the corresponding manifold 2, thereby pushing or pulling the end of the manifold 2 in the mold groove 73 to bend, realizing the bending process of the end of the manifold 2. Since other parts of the manifold 2 are still in the corresponding mold groove 73 and are still restricted by the mold groove 73, deformation of other parts of the manifold 2 is prevented, ensuring product quality. Moreover, the bent product does not need to be reshaped, with fewer processing steps and higher processing efficiency. At the same time, it also ensures product consistency and enhances product value.

[0031] More specifically, a bending groove 821 is provided at the end and / or side of the elbow 82, so that a bending groove 821 is provided at the part where the elbow 82 contacts the manifold 2. Furthermore, when the manifold 2 is bent by the elbow 82, when the elbow 82 contacts the end of the manifold 2 to be bent, the end of the manifold 2 is inserted into the bending groove 821 of the corresponding elbow 82, so that the end of the manifold 2 can be restricted by the bending groove 821, ensuring that the elbow 82 can stably act on the corresponding manifold 2, ensuring that the manifold 2 can be bent in the predetermined direction, and improving the bending quality.

[0032] More specifically, each mold groove 73 corresponding to the manifold 2 is divided into a straight groove section 731 and a curved groove section 732. At this time, one end of the straight groove section 731 is connected to the mold groove 73 corresponding to the main pipe 1 to provide a constraint for the parts of the manifold 2 that do not need to be deformed. The other end of the straight groove section 731 is connected to the corresponding curved groove section 732. Furthermore, the elbow 82 corresponding to the mold groove 73 is slidably placed at the connection between the straight groove section 731 and the curved groove section 732 of the mold groove 73. This allows the elbow 82 to act on the part of the manifold 2 that needs to be bent when the manifold 2 needs to be bent. This enables the manifold 2 to be bent more accurately and meets the bending processing requirements.

[0033] Figure 6 for Figure 4 Enlarged view of section A; Figure 7 This is a structural diagram of the arc-shaped rotating sleeve according to a preferred embodiment of the present invention. Figures 4 to 7As shown, a concave rotating groove 74 is coaxially formed on the bottom of one half of the groove 73 corresponding to the main pipe 1. Two arc-shaped rotating sleeves 9 are coaxially arranged within the rotating groove 74. When the arc-shaped rotating sleeves 9 are installed in the rotating groove 74, their inner walls are flush with the inner wall of the half-groove, ensuring that the installation of the arc-shaped rotating sleeves 9 does not affect the structure of the half-groove itself and maintains its original functionality. Furthermore, the two arc-shaped rotating sleeves 9 are arranged side-by-side along the axial direction of the half-groove, allowing them to be staggered and ensuring that their subsequent movements do not interfere with each other, maintaining their independence. Both arc-shaped rotating sleeves 9 rotate circumferentially within the rotating groove 74, making them movable structures, providing conditions for subsequent sensing of the tilting of the main pipe 1 and its subsequent movement. In addition, a telescopic spring 91 is provided between the two arc-shaped rotating sleeves 9 and the bottom of the corresponding rotating groove 74. One side of one arc-shaped rotating sleeve 9 selectively extends out of the half-groove from one side of the rotating groove 74, and the other side of the other arc-shaped rotating sleeve 9 selectively extends out of the half-groove from the other side of the rotating groove 74. The direction of the force of the telescopic spring 91 acting on the corresponding arc-shaped state is set to push one side of the corresponding arc-shaped rotating sleeve 9 out of the corresponding half-groove. That is, when the first half-mold 71 and the second half-mold 72 are opened, the corresponding side of the two arc-shaped rotating sleeves 9 can automatically extend out of the half-groove under the action of the telescopic spring 91, which provides the conditions for subsequent tilt detection of the main pipe 1. Meanwhile, a first trigger switch 92 is provided between each arc-shaped rotating sleeve 9 and the rotating groove 74, and the first trigger switch 92 is electrically connected to the external display circuit. It is set that when the first trigger switch 92 is triggered, the external display circuit displays the current status. That is, when the arc-shaped rotating sleeve 9 rotates in the rotating groove 74, the first trigger switch 92 can be triggered to realize the action detection of the arc-shaped rotating sleeve 9. When the main tube 1 is clamped and tilted, the outer wall of the main tube 1 will extend out of the half groove and abut against an arc-shaped rotating sleeve 9. So when the mold is closed, the first half mold 71 or the second half mold 72 will directly press on the tilted main tube 1. The main tube 1 pushes the arc-shaped rotating sleeve 9 to move, and the external display circuit displays the action. This allows the operator to obtain the clamping status in time and adjust the tilted main tube 1 in time, preventing the problem of crushing the outer wall of the main tube 1 when the mold is closed, and ensuring product quality. It is worth noting that the two arc-shaped rotating sleeves 9 extend from both sides of their respective half-grooves, enabling detection structures on both sides of the half-grooves. This allows detection to be achieved regardless of which side the main pipe 1 tilts towards. Since the tilt of the main pipe 1 in the mold-closing direction is adjusted by the movement of the first half-mold 71 or the second half-mold 72 and automatically aligned during mold closing, this embodiment only considers the tilt of the main pipe 1 perpendicular to the mold-closing direction.

[0034] More specifically, a limiting half-ring 93 is provided on the outer wall of each arc-shaped rotating sleeve 9. At this time, two recessed limiting grooves 741 are provided on the bottom of the rotating groove 74 along its axial direction, and the two limiting grooves 741 are arranged along the circumference of the rotating groove 74, so that the limiting grooves 741 can adapt to the rotation of the arc-shaped rotating sleeve 9. Furthermore, the cross-sections of the limiting grooves 741 and the limiting half-rings 93 are arranged in a "T" shape. The two limiting half-rings 93 are slidably placed in the two limiting grooves 741 respectively. That is, through the mutual restriction of the two limiting half-rings 93 and the two limiting grooves 741, the stable installation of the arc-shaped rotating sleeve 9 in the rotating groove 74 is achieved. This not only meets the rotation requirements of the arc-shaped rotating sleeve 9 in the rotating groove 74, but also prevents the arc-shaped rotating sleeve 9 from falling out of the rotating groove 74, making the structural design more reasonable.

[0035] Figure 8 This is a schematic diagram illustrating the installation of the first trigger switch, the second trigger switch, the telescopic spring, and the push rod according to a preferred embodiment of the present invention. Figure 7 and Figure 8 As shown, a first insertion hole 931 is provided on the end face of the limiting half ring 93 and on the side of the arc-shaped rotating sleeve 9 that selectively extends into the half groove. At the same time, a second insertion hole 7411 is provided at one end of the corresponding limiting groove 741. The first insertion hole 931 and the second insertion hole 7411 are arranged opposite to each other. The two ends of the telescopic spring 91 are respectively inserted into the first insertion hole 931 and the second insertion hole 7411. The first insertion hole 931 and the second insertion hole 7411 restrict the two ends of the telescopic spring 91, preventing the telescopic spring 91 from coming out between the limiting half ring 93 and the limiting groove 741, thus improving the installation stability. Furthermore, the first trigger switch 92 is placed inside the second socket 7411 and abuts against the telescopic spring 91, so that the arc-shaped rotating sleeve 9 can trigger the first trigger switch 92 through the telescopic spring 91, thereby realizing the detection of the movement of the arc-shaped rotating sleeve 9. When the clamping mold 7 is not closed and one side of the arc-shaped rotating sleeve 9 is kept extending out of the half groove, the telescopic spring 91 is in a state of no force, and the first trigger switch 92 is not triggered at this time. However, when the clamping mold 7 is closed and the arc-shaped rotating sleeve 9 is pushed towards the half groove by the inclined main pipe 1, the telescopic spring 91 is compressed, and the telescopic spring 91 will squeeze the first trigger switch 92 to trigger the first trigger switch 92, thereby obtaining the tilting state information of the main pipe 1.

[0036] More specifically, it also includes a second trigger switch 94, which is electrically connected to the external display circuit so that when the second trigger switch 94 is triggered, the external display circuit can also display the corresponding status signal. At this time, a protruding push rod 932 is also provided on the end face of each limiting half-ring 93 located where the first insertion hole 931 is provided. Simultaneously, a recessed hole 7412 is also provided in the limiting groove 741 corresponding to the limiting half-ring 93, at the end where the second insertion hole 7411 is provided. The second trigger switch 94 is installed in the recessed hole 7412. When the limiting half-ring 93 moves towards the recessed hole 7412, the push rod 932 will extend into the recessed hole 7412 and trigger the second trigger switch. The ejector rod 932 abuts against the second trigger switch 94 when one side of the arc-shaped rotating sleeve 9 is not extended outside the half-groove. That is, the ejector rod 932 will trigger the second trigger switch 94 only when the side of the arc-shaped rotating sleeve 9 extending outside the half-groove is completely pressed into the rotating groove 74. In other words, the second trigger switch 94 will only be triggered when the mold is closed in place, otherwise it will not be triggered. This realizes the detection of mold closing in place, thereby providing safety monitoring for the subsequent control of the bending tube drive component 8.

[0037] It is worth noting that since the first trigger switch 92 is triggered at the initial movement of the arc-shaped rotating sleeve 9, there are two scenarios for the triggering of the first trigger switch 92. The first scenario is that the main pipe 1 tilts, and during mold closing, either the first half mold 71 or the second half mold 72 will push the arc-shaped rotating sleeve 9 through the tilted main pipe 1, causing the arc-shaped rotating sleeve 9 to rotate. The second scenario is that the main pipe 1 does not tilt, and during mold closing, either the first half mold 71 or the second half mold 72 directly pushes the arc-shaped rotating sleeve 9, causing it to rotate. Although both... In all these cases, the first trigger switch 92 can be triggered. However, when the main pipe 1 is tilted and the arc-shaped rotating sleeve 9 rotates, the distance between the first half mold 71 and the second half mold 72 is the sum of the diameter of the main pipe 1 and the distance of the arc-shaped rotating sleeve 9 extending out of the half groove. When the main pipe 1 is not tilted and the arc-shaped rotating sleeve 9 rotates, the distance between the first half mold 71 and the second half mold 72 is only the distance of the arc-shaped rotating sleeve 9 extending out of the half groove. Therefore, the operator can determine whether the main pipe 1 is tilted based on the moving distance of the mold closing driver 6.

[0038] More specifically, each arc-shaped rotating sleeve 9 is provided with an extension arm 95 at one end that selectively extends out of the half-groove and is close to the other arc-shaped rotating sleeve 9. Preferably, the extension arm 95 and the corresponding arc-shaped rotating sleeve 9 are integrally formed, resulting in higher structural strength. In this case, one side of the extension arm 95 is flush with the side of the corresponding arc-shaped rotating sleeve 9 that selectively extends out of the half-groove. That is, the extension arm 95 extends the length of the arc-shaped rotating sleeve 9 along the mold groove 73, allowing the arc-shaped rotating sleeve 9 to provide a larger detection contact surface. Thus, even if the two arc-shaped rotating sleeves 9 are arranged side by side in the axial direction of the half-groove, the detection contact surface of each arc-shaped rotating sleeve 9 can completely cover one side of the rotating groove 74, resulting in more comprehensive and reliable detection. In addition, the other side of the extension arm 95 is located inside the rotating groove 74, allowing the extension arm 95 to also cooperate with the rotating groove 74, thereby increasing the contact area between the arc-shaped rotating sleeve 9 and the rotating groove 74 and improving the installation stability of the arc-shaped rotating sleeve 9. Meanwhile, when one side of the arc-shaped rotating sleeve 9 extends outside the semi-groove, a gap is provided between the side of the extension arm 95 located inside the rotating groove 74 and the other arc-shaped rotating sleeve 9. This gap provides clearance for the subsequent movement of the arc-shaped rotating sleeve 9 within the rotating groove 74, preventing the two arc-shaped rotating sleeves 9 from blocking each other. Furthermore, when one side of the arc-shaped rotating sleeve 9 does not extend outside the semi-groove, the side of the extension arm 95 located inside the rotating groove 74 abuts against the other arc-shaped rotating sleeve 9. That is, after the arc-shaped rotating sleeve 9 is completely pressed into the semi-groove, the two arc-shaped rotating sleeves 9 can abut against each other and form a complete semi-circular ring structure, achieving complete filling of the rotating groove 74. This allows the inner wall of the semi-groove to be connected by the two arc-shaped rotating sleeves 9, thereby preventing the outer wall of the manifold 2 from being damaged due to gaps during the bending process. The structural design is more reasonable.

[0039] It is worth noting that in the straight groove section 731 of the mold groove 73 corresponding to manifold 2, the half groove constituting the straight groove section 731 can also be equipped with a rotating groove 74, an arc-shaped rotating sleeve 9, a telescopic spring 91, a first trigger switch 92, etc., which are the same structures installed in the half groove of the mold groove 73 corresponding to the main pipe 1. That is, it can also realize the detection of the tilt angle of manifold 2 and meet different processing requirements. In other words, the structure used for tilt monitoring of main pipe 1 is also applicable to tilt monitoring of manifold 2. Since the two structures are the same, they will not be described in detail here.

[0040] The multi-pipe bending forming process and tooling provided in this embodiment include step S1, processing of the main pipe 1 and manifold 2; step S2, spot welding; step S3, brazing; and step S4, bending. The tooling includes a base plate 4, a moving frame 5, a mold clamping driver 6, a clamping mold 7, and several bending drive components 8. First, several straight manifolds 2 are spot-welded and brazed onto the main pipe 1. Then, the mold clamping driver 6 drives the clamping mold 7 to clamp the main pipe 1 with the several straight manifolds 2. The manifolds 2 are restricted by the mold groove 73 of the clamping mold 7. Furthermore, each manifold 2 corresponds to a bending drive 8. Finally, several straight manifolds 2 are simultaneously bent by several bending drive 8, realizing one-time bending processing of multiple manifolds 2, which improves processing efficiency. In addition, the clamping mold 7 is used as the bending mold of the bending drive 8 to ensure the standardization of the bending processing of manifolds 2. Thus, after bending, manifolds 2 do not need to be reshaped. Bending is the final process, thereby reducing processing steps, improving product consistency, further improving product processing efficiency, and enhancing product processing benefits.

[0041] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A tooling used in a multi-tube bending forming process, characterized in that, include: A base plate, with mounting vertical plates at both ends, and a guide rail is provided on the base plate and between the two mounting vertical plates; Each of the aforementioned mounting vertical plates corresponds to one of the aforementioned movable frames, and both of the aforementioned movable frames are slidably mounted on the guide rail; A mold closing driver is installed on each of the two mounting vertical plates, and the mold closing driver is poweredly connected to the corresponding moving frame. The clamping mold includes a first half mold and a second half mold. The first half mold and the second half mold are respectively installed on opposite sides of the two movable frames. The clamping mold has a plurality of mold slots corresponding to the main pipe and the manifold. Each mold slot is divided into two half slots and respectively disposed on the first half mold and the second half mold. A plurality of pipe bending drive components, each of the pipe bending drive components including a telescopic driver and an elbow, the plurality of telescopic drivers being respectively disposed on two movable frames, and each mold groove corresponding to the manifold corresponding to one telescopic driver, the elbow being slidably disposed on the first half mold or the second half mold and connected to the corresponding telescopic driver; A concave rotating groove is coaxially formed on the bottom of one half of the mold groove corresponding to the main tube. Two arc-shaped rotating sleeves are coaxially arranged in the rotating groove. The two arc-shaped rotating sleeves are arranged side by side along the axial direction of the half groove and both arc-shaped rotating sleeves rotate circumferentially within the rotating groove. A telescopic spring is provided between the two arc-shaped rotating sleeves and the bottom of the corresponding rotating groove. One side of one arc-shaped rotating sleeve selectively extends out of the half groove from one side of the rotating groove, and the other side of the other arc-shaped rotating sleeve selectively extends out of the half groove from the other side of the rotating groove. At the same time, a first trigger switch is provided between each arc-shaped rotating sleeve and the rotating groove. The first trigger switch is electrically connected to an external display circuit. When the arc-shaped rotating sleeve rotates in the rotating groove, the first trigger switch is triggered to realize the action detection of the arc-shaped rotating sleeve. When the main tube is clamped and tilted, the outer wall of the main tube will extend out of the half groove and abut against one of the arc-shaped rotating sleeves.

2. The tooling used in the multi-tube bending forming process according to claim 1, characterized in that, The elbow has a bending groove at its end and / or side, and when the elbow contacts the end of the manifold to be bent, the end of the manifold is engaged in the bending groove corresponding to the elbow.

3. The tooling used in the multi-tube bending forming process according to claim 1, characterized in that, Each of the mold grooves corresponding to the manifold includes a straight groove section and a curved groove section. One end of the straight groove section is connected to the mold groove corresponding to the main pipe, and the other end is connected to the corresponding curved groove section. The corresponding elbow is slidably disposed at the connection between the straight groove section and the curved groove section.

4. The tooling used in the multi-tube bending forming process according to claim 1, characterized in that, Each of the arc-shaped rotating sleeves is provided with a limiting half-ring on its outer side wall. Two recessed limiting grooves are provided on the bottom of the rotating groove along its axial direction. Both limiting grooves are arranged around the circumference of the rotating groove. The cross-sections of the limiting grooves and the limiting half-rings are arranged in a "T" shape. The two limiting half-rings are respectively slidably disposed in the two limiting grooves.

5. The tooling used in the multi-tube bending forming process according to claim 4, characterized in that, A first insertion hole is provided on the end face of the limiting semi-ring and on the side where the arc-shaped rotating sleeve selectively extends into the semi-groove. At the same time, a second insertion hole is provided at one end of the corresponding limiting groove. Both ends of the telescopic spring extend into the first insertion hole and the second insertion hole, respectively. The first trigger switch is provided in the second insertion hole and abuts against the telescopic spring.

6. The tooling used in the multi-tube bending forming process according to claim 5, characterized in that, It also includes a second trigger switch, which is electrically connected to the external display circuit. Each of the limiting semi-rings is provided with a top rod on the end face where the first insertion hole is provided. At the same time, a recessed hole is opened at the end of the corresponding limiting groove where the second insertion hole is provided. The second trigger switch is installed in the recessed hole. When one side of the arc-shaped rotating sleeve does not extend out of the semi-groove, the end of the top rod abuts against the second trigger switch.

7. The tooling used in the multi-tube bending forming process according to claim 4, characterized in that, Each of the arc-shaped rotating sleeves has an extension arm at one end that selectively extends out of the half-groove and is close to the other arc-shaped rotating sleeve. One side of the extension arm is flush with the side of the corresponding arc-shaped rotating sleeve that selectively extends out of the half-groove, and the other side of the extension arm is located inside the rotating groove. When one side of the arc-shaped rotating sleeve extends out of the half-groove, there is a gap between the side of the extension arm located inside the rotating groove and the other arc-shaped rotating sleeve. When one side of the arc-shaped rotating sleeve does not extend out of the half-groove, the side of the extension arm located inside the rotating groove abuts against the other arc-shaped rotating sleeve.

8. A multi-tube bending forming process, implemented using the tooling described in any one of claims 1-7, comprising the following steps: Step S1: Processing of main pipes and manifolds; Cut the main pipe and the manifold to the required length, and make several connection holes on the wall of the main pipe corresponding to the manifold; Step S2, spot welding; Insert one end of the manifold into the corresponding connection hole on the main pipe and perform spot welding. Then, fit a mounting block onto one end of the main pipe and spot weld it together. Step S3, brazing; The spot-welded main pipe and manifold, as well as the main pipe and mounting block, are brazed to obtain a straight pipe semi-finished product. Step S4, bending; The straight pipe semi-finished product is placed into the bending fixture, and the main pipe and each manifold are clamped by the clamping mold of the bending fixture. Then, the end of the corresponding manifold is bent by the bending drive component with the bend in the bending fixture to obtain the multi-pipe bent finished product.

9. The multi-tube bending forming process according to claim 8, characterized in that, The mounting block is a sheet-like structure with several mounting holes. The mounting block also has a set of holes. One end of the main tube is inserted into the set of holes and then welded to the mounting block. The mounting block is processed synchronously in step S1.

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