Cold sizing process equipment for guide pipe

Abstract

The cold sizing process equipment comprises a base, a bottom plate, a screw, a supporting rod, a bolt, a heavy oil hydraulic cylinder, an ejector rod head, a positioning plug pin, a manual hydraulic pump and a Y-shaped chuck. The bottom plate is arranged above the base playing a supporting role, and the base and the bottom plate are fixedly connected through screws; a plurality of round holes for mounting and positioning the supporting rods are formed in the bottom plate; meanwhile, a heavy hydraulic cylinder is also mounted on the bottom plate; one end of the heavy hydraulic cylinder is connected with the manual hydraulic pump and is used for providing a power source; a hydraulic rod extends out of the other end head of the Y-shaped clamping head and is fixedly connected with the Y-shaped clamping head; the Y-shaped chuck is connected with the ejector rod head through a positioning bolt; a conduit to be shaped is placed on the supporting rod; the hydraulic rod is stretched out and drawn back by operating the manual hydraulic pump, and then the Y-shaped chuck and the ejector rod head are pushed to move, so that guide pipe shape correction is achieved. The guide pipe shape correction efficiency is improved, the labor intensity of manual shape correction is reduced, and then the engine assembling efficiency is improved.

Description

Technical Field

[0001] This invention relates to a cold forming process equipment for conduits, belonging to the field of mold forming technology. Background Technology

[0002] A liquid rocket engine mainly consists of components such as a frame, turbopump, and thrust chamber. Between the turbopump and the thrust chamber are numerous pipes for fuel circulation, enabling the fuel cycle of the liquid rocket engine and thus fulfilling its function. These pipes primarily connect the inlets and outlets of various components. Due to manufacturing errors in these components, and the cumulative tolerances during engine assembly, the actual fuel inlet and outlet positions may differ from the theoretical ones.

[0003] The bending of conduits is generally carried out according to the drawings. However, due to differences in location during assembly, many conduits cannot directly meet the installation requirements. On-site adjustments must be made based on the actual fuel inlet and outlet locations to achieve proper assembly on the engine. Therefore, a cold-forming tooling for conduits is needed that can meet the requirements for opening and closing bends of different sizes and bending radii, while also minimizing manual forming work. Summary of the Invention

[0004] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose a cold-forming process equipment for ducts, which solves the problem of on-site repair of ducts used in engine assembly and realizes the cold forming of pre-formed ducts.

[0005] The technical solution of this invention is: a cold-forming process equipment for conduits, comprising a base, a base plate, screws, support rods, bolts, a heavy-duty hydraulic cylinder, a push rod head, a positioning pin, a manual hydraulic pump, and a Y-type chuck; wherein, A base plate is installed on top of the supporting base, and the two are fixedly connected by screws. The base plate has multiple round holes for positioning the support rod. A heavy-duty hydraulic cylinder is also installed on the base plate. One end of the heavy-duty hydraulic cylinder is connected to a manual hydraulic pump to provide power. A hydraulic rod extends from the other end and is fixedly connected to a Y-shaped clamp. The Y-shaped clamp and the push rod head are connected by a positioning pin. The guide tube to be shaped is placed on the support rod. By operating the manual hydraulic pump, the hydraulic rod is extended or retracted, thereby pushing the Y-shaped clamp and the push rod head to move, achieving the guide tube shaping.

[0006] The base plate serves as the positioning panel for the support rod. By organizing the data on different bending radii and bending angles of the guide tube to be calibrated, the required support rod position is determined, i.e., the distribution of the circular holes on the base plate. The circular holes on the surface of the base plate are symmetrically arranged in pairs around the vertical center line of the base plate. The distance between the centers of two symmetrical circular holes is greater than the sum of the bending mid-diameter of the guide tube to be calibrated and the diameter of the guide tube to be calibrated.

[0007] The circular holes are arranged in a staggered manner in an up-down pattern to accommodate the shape of conduits with different specifications, sizes, bending radii, and bending angles.

[0008] The Y-shaped chuck has a Y-shaped opening and a side through hole at one end, which is connected to the push rod head through a positioning pin to install and fix the push rod head, and pushes the push rod head to reciprocate along with the extension and retraction of the hydraulic cylinder; the other end has an internal thread structure and is fixedly connected to the hydraulic rod extended from the heavy hydraulic cylinder. The Y-shaped chuck comes in two lengths, long and short, to compensate for the insufficient stroke of the hydraulic cylinder and flexibly achieve guide tube alignment at the closest and furthest positions from the hydraulic pump.

[0009] The push rod head is made of polypropylene, and its thickness is the same as the Y-shaped opening size of the Y-type clamp. One end of the push rod head has a through hole and is connected to the Y-type clamp through a positioning pin. The profile of the other end is determined by the diameter of the guide tube to be calibrated, and the radius of the push rod head profile is the same as the radius of the guide tube to be calibrated. There are two structural forms of the push rod head, which are used for the opening and closing bending correction processes respectively. The center of the opening bending push rod head profile is on the upper side of the through hole, and the center of the closing bending push rod head profile is on the lower side of the through hole.

[0010] The support rod includes a rotating shaft, a rotating ring, and a nut; the rotating shaft passes through the central hole of the rotating ring, and the top end is tightened with a nut; the material of the rotating shaft is selected as 30CrMnSi.

[0011] The rotating ring is made of polypropylene and adopts a cylindrical rotating ring + straight groove structure. Specifically, the overall structure of the rotating ring adopts a pipe bending clamp roller structure, and the center of the cylindrical structure is machined with an annular surface, the size of which matches the specifications of the guide tube to be calibrated; one side of the rotating ring is designed as a straight groove structure, the diameter of which matches the diameter of the guide tube to be calibrated, and the surface passes through the center of the guide tube to be calibrated.

[0012] Let the number of support rods be N and the number of top rod heads be M, then 2N=M=P, where P is the type of pipe diameter specification to be calibrated.

[0013] Multiple circular holes of different positions and sizes are machined on the base plate, symmetrical about the vertical center line, for the installation and positioning of the support rod.

[0014] A method for cold-forming a catheter using the aforementioned equipment includes: When performing cold straightening of the conduit, according to the specifications of the conduit to be straightened, select two support rods and one top rod head from N support rods and M top rod heads that match the diameter of the conduit to be straightened; insert the two support rods symmetrically into the positioning holes on the base plate; install the top rod head onto the Y-shaped clamp, and fix the other end of the Y-shaped clamp to the hydraulic rod extending from the heavy-duty hydraulic cylinder through the internal thread, and then provide the power source by connecting a manual hydraulic pump; The guide tube to be shaped is placed against the profile of the support rod. By operating the manual hydraulic pump, the hydraulic rod of the heavy-duty hydraulic cylinder is extended, and the arc of the guide tube to be shaped is pushed out through the end of the push rod. Then, the guide tube to be shaped is bent and shaped. By adjusting the orientation of the arc of the guide tube to be shaped, the opening and closing bending of the arc of the guide tube to be shaped can be achieved.

[0015] The advantages of this invention compared to existing technologies are as follows: By replacing support rods and push rod heads of different specifications, this invention achieves cold forming of conduits of various specifications, bending radii, and bending angles using a single tooling. This cold forming tooling can be used for forming both semi-finished conduits (without nozzles) and conduits with welded nozzles, improving conduit forming efficiency, reducing the labor intensity of manual forming, and thus improving engine assembly efficiency. Attached Figure Description

[0016] Figure 1 Front view of the equipment structure for the cold forming process of conduits; Figure 2 Top view of the equipment used in the cold forming process of conduits; Figure 3 This is a schematic diagram of the base plate structure; Figure 4 This is a schematic diagram of a Y-type chuck structure, where (a) represents the short chuck and (b) represents the long chuck. Figure 5 The diagram shows the structure of the top rod head, where (a) represents the top rod head with a closed bend and (b) represents the top rod head with an open bend. Figure 6 This is a schematic diagram of the support structure; Figure 7 This is a schematic diagram of a rotating ring structure; Figure 8 This is a schematic diagram simulating the duct bending action; Figure 9 This is a schematic diagram simulating the opening and bending action of a conduit. Detailed Implementation

[0017] like Figure 1 , 2 As shown, the present invention provides a cold-forming process equipment for a conduit, comprising a base 1, a base plate 2, screws 3, support rods 4, bolts 5, a heavy-duty hydraulic cylinder 6, a push rod head 7, a positioning pin 8, a manual hydraulic pump 9, and a Y-type chuck 10; wherein, the conduit diameter specification is P, the number of support rods is N, the number of push rod heads is M, and P=2N=M.

[0018] The base 1 primarily serves a supporting function, and its height can be designed for ease of manual operation. A base plate 2 is fixedly installed on top, and the two are connected by screws 3. Multiple circular holes of different positions and sizes, symmetrical about the vertical centerline, are machined on the base plate 2 for the installation and positioning of the support rod 4. A heavy-duty hydraulic cylinder 6 is also installed on the base plate 2. One end of the heavy-duty hydraulic cylinder 6 is connected to a manual hydraulic pump 9 to provide a power source; the other end has a hydraulic rod extending from its tip, which is fixedly connected to a Y-shaped chuck 10. The Y-shaped chuck 10 is connected to the top rod head 7 via a positioning pin 8. By manually operating the manual hydraulic pump 9, the hydraulic rod extends and retracts, thereby pushing the Y-shaped chuck 10 and the top rod head 7 to move, achieving guide tube shaping. The support rod 4 has a profile matching the guide tube diameter specifications; the top of the top rod head 7 has a profile designed according to the guide tube diameter and bending radius.

[0019] like Figure 3 The diagram shows the structure of the base plate 2, which has multiple circular holes of different positions and sizes, symmetrically arranged about the vertical centerline. The base plate 2 serves two purposes: firstly, it mounts the heavy-duty hydraulic cylinder 6 and the manual hydraulic pump 9, requiring the heavy-duty hydraulic cylinder 6 to be centrally located; secondly, it serves as the positioning panel for the support rod 4. By analyzing data on different bending radii and angles of the guide tube to be calibrated, the required support positions of the support rod 4, i.e., the distribution of the circular holes on the base plate 2, are determined. The circular holes on the surface of the base plate 2 are symmetrically arranged in pairs about the vertical centerline of the base plate 2, with the center distance between two symmetrical holes being greater than twice the sum of the bending mid-diameter and the diameter of the guide tube to be calibrated. Depending on the actual application scenario and conditions, the circular holes can be staggered in an up-and-down arrangement to accommodate guide tubes of different sizes and bending radii and angles.

[0020] like Figure 4 The diagram shows the structure of the Y-type chuck 10. One end has a Y-shaped opening with a side-through hole, which connects to the push rod head 7 via a positioning pin 8, thus fixing the push rod head 7 in place and allowing it to reciprocate along with the extension and retraction of the hydraulic cylinder 6. The other end has an internal thread structure and is fixedly connected to the hydraulic rod extending from the heavy-duty hydraulic cylinder 6. The Y-type chuck is available in long and short versions to compensate for insufficient hydraulic cylinder stroke, flexibly achieving guide tube alignment at the closest and furthest positions from the hydraulic pump.

[0021] like Figure 5The diagram shows the structure of the push rod head 7, whose thickness is consistent with the Y-shaped opening size of the Y-type chuck 10. As a key component of this tooling, the profile of the push rod head significantly impacts the surface quality of the shaped guide tube. One end of the push rod head 7 has a through hole, connected to the Y-type chuck 10 via a positioning pin 8. There are two structural forms of the push rod head, used for both open and closed bending processes. In open bending, the center of the push rod head profile is above the through hole, while in closed bending, the center of the push rod head profile is below the through hole. The profile of the push rod head is determined by the diameter of the guide tube being shaped, and the radius of the push rod head 7 profile is consistent with the radius of the guide tube being shaped. The material of the push rod head also affects the surface quality of the shaped guide tube. Since the guide tube is made of stainless steel, polypropylene is the preferred material for the push rod head. This material is relatively soft yet provides good support, capable of withstanding the shaping force of the guide tube, and free from defects such as indentations and scratches on the guide tube.

[0022] like Figure 6 , 7 The diagram shows the structure of support rod 4 and the swivel. The support rod consists of three parts: a swivel shaft, a swivel, and a nut. This structure decomposes the function of the support rod into support and rotation. Its biggest advantage is that it shifts the stress point of the support rod's rotation during the conduit bending process from the bottom to the swivel. This means that during operation, the swivel is no longer subject to torque, allowing for freer rotation and more effectively preventing damage to the conduit. The swivel shaft mainly serves a supporting function, and the preferred material is high-strength 30CrMnSi.

[0023] The swivel ring mimics conventional pipe bending clamp rollers. To avoid frontal compression and indentation of the conduit, it employs a cylindrical swivel ring with a straight groove structure. One side of the swivel ring is designed as a straight groove, the diameter of which matches the diameter of the conduit being shaped, and the groove surface passes through the center of the conduit. This structure increases the contact area between the swivel ring and the conduit, changing from line contact to surface contact. Furthermore, the swivel ring's profile passing through the center of the conduit's diameter provides support and constraint for the conduit's shape during the shaping process, preventing excessive flattening. The material used is polypropylene, the same material as the push rod head, to minimize damage to the conduit.

[0024] like Figure 8 , 9 The diagram shown is a simulation of the conduit's closing and opening bends. During closing bend correction, the closing bend jack head 7 is selected, and the conduit is placed on the same side of the center as the hydraulic rod, meaning the conduit's arc faces the jack head. During opening bend correction, the opening bend jack head 7 is selected, and the conduit is placed on the opposite side of the center from the hydraulic rod, meaning the conduit's arc faces away from the jack head. By adjusting the orientation of the conduit's arc, the opening and closing bend corrections of the conduit's arc can be achieved.

[0025] This invention relates to a cold-forming equipment for conduits, which eliminates the need for other equipment by having its own manual hydraulic pump to provide power output for conduit forming. The specific operation process is as follows: When performing cold-forming of the conduit, based on the conduit specifications, select two support rods 4 and one top rod head 7 from N support rods 4 and M top rod heads 7 that match the conduit diameter. Insert the two support rods 4 symmetrically into the positioning holes on the base plate 2. The specific hole positions must be determined based on the bending radius and bending angle of the conduit's required forming arc. The distance between the positioning holes must be greater than twice the bending radius (middle diameter) + the pipe diameter. Install the top rod head 7 onto the Y-shaped clamp 10. The other end of the Y-shaped clamp 10 is fixedly connected to the hydraulic rod extending from the heavy-duty hydraulic cylinder 6 via an internal thread, and then powered by a manual hydraulic pump 9. After the above parts are installed, place the conduit being formed against the profile on the support rods 4. Then, operate the manual hydraulic pump 9 to drive the hydraulic rod of the heavy-duty hydraulic cylinder 6 to extend, thereby pushing the conduit arc out through the end of the top rod head 7, and then perform pressure bending and forming of the conduit. By adjusting the orientation of the conduit arc, the opening and closing bending of the conduit arc can be achieved. See the forming simulation. Figure 8 , 9 As shown.

[0026] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention based on the above-disclosed technical content without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A cold-forming process equipment for conduits, characterized in that, include: Base, base plate, screws, support rods, bolts, heavy-duty hydraulic cylinder, push rod head, positioning pin, manual hydraulic pump, Y-type chuck; among which, A base plate is installed on top of the supporting base, and the two are fixedly connected by screws. The base plate has multiple round holes for positioning the support rod. A heavy-duty hydraulic cylinder is also installed on the base plate. One end of the heavy-duty hydraulic cylinder is connected to a manual hydraulic pump to provide power. A hydraulic rod extends from the other end and is fixedly connected to a Y-shaped clamp. The Y-shaped clamp and the push rod head are connected by a positioning pin. The guide tube to be shaped is placed on the support rod. By operating the manual hydraulic pump, the hydraulic rod is extended or retracted, thereby pushing the Y-shaped clamp and the push rod head to move, achieving the guide tube shaping.

2. The conduit cold forming process equipment according to claim 1, characterized in that, The base plate serves as the positioning panel for the support rod. By organizing the data on different bending radii and bending angles of the guide tube to be calibrated, the required support rod position is determined, i.e., the distribution of the circular holes on the base plate. The circular holes on the surface of the base plate are symmetrically arranged in pairs around the vertical center line of the base plate. The distance between the centers of two symmetrical circular holes is greater than the sum of the bending mid-diameter of the guide tube to be calibrated and the diameter of the guide tube to be calibrated.

3. The conduit cold forming process equipment according to claim 2, characterized in that, The circular holes are arranged in a staggered manner in an up-down pattern to accommodate the shape of conduits with different specifications, sizes, bending radii, and bending angles.

4. The conduit cold forming process equipment according to claim 1, characterized in that, The Y-shaped chuck has a Y-shaped opening and a side through hole at one end, which is connected to the push rod head through a positioning pin to install and fix the push rod head, and pushes the push rod head to reciprocate along with the extension and retraction of the hydraulic cylinder; the other end has an internal thread structure and is fixedly connected to the hydraulic rod extending from the heavy-duty hydraulic cylinder.

5. The conduit cold forming process equipment according to claim 2, characterized in that, The Y-shaped chuck comes in two lengths, long and short, to compensate for the insufficient stroke of the hydraulic cylinder and flexibly achieve guide tube alignment at the closest and furthest positions from the hydraulic pump.

6. The conduit cold forming process equipment according to claim 2, characterized in that, The push rod head is made of polypropylene, and its thickness is consistent with the Y-shaped opening size of the Y-type clamp. One end of the push rod head has a through hole and is connected to the Y-type clamp through a positioning pin. The profile of the other end is determined by the diameter of the guide tube to be calibrated, and the radius of the push rod head profile is consistent with the radius of the guide tube to be calibrated. The push rod head has two structural forms, which are used for the opening and closing bending calibration processes, respectively. The center of the opening bending push rod head profile is on the upper side of the through hole, and the center of the closing bending push rod head profile is on the lower side of the through hole.

7. The conduit cold forming process equipment according to claim 1, characterized in that, The support rod includes a rotating shaft, a rotating ring, and a nut; the rotating shaft passes through the central hole of the rotating ring, and the top end is tightened with a nut; the material of the rotating shaft is selected as 30CrMnSi.

8. The conduit cold forming process equipment according to claim 1, characterized in that, The rotating ring is made of polypropylene and adopts a cylindrical rotating ring + straight groove structure. Specifically, the overall structure of the rotating ring adopts a pipe bending clamp roller structure, and the center of the cylindrical structure is machined with an annular surface, the size of which matches the specifications of the guide tube to be calibrated; one side of the rotating ring is designed as a straight groove structure, the diameter of which matches the diameter of the guide tube to be calibrated, and the surface passes through the center of the guide tube to be calibrated.

9. The conduit cold forming process equipment according to claim 1, characterized in that, Let the number of support rods be N and the number of top rod heads be M, then 2N=M=P, where P is the type of pipe diameter specification to be calibrated.

10. A method for cold-forming a conduit using the equipment described in claim 1, comprising: When performing cold straightening of the conduit, according to the specifications of the conduit to be straightened, select two support rods and one top rod head from N support rods and M top rod heads that match the diameter of the conduit to be straightened; insert the two support rods symmetrically into the positioning holes on the base plate; install the top rod head onto the Y-shaped clamp, and fix the other end of the Y-shaped clamp to the hydraulic rod extending from the heavy-duty hydraulic cylinder through the internal thread, and then provide the power source by connecting a manual hydraulic pump; The guide tube to be shaped is placed against the profile of the support rod. By operating the manual hydraulic pump, the hydraulic rod of the heavy-duty hydraulic cylinder is extended, and the arc of the guide tube to be shaped is pushed out through the end of the push rod. Then, the guide tube to be shaped is bent and shaped. By adjusting the orientation of the arc of the guide tube to be shaped, the opening and closing bending of the arc of the guide tube to be shaped can be achieved.

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