A water bulking forming machine for stainless steel pipe machining

Abstract

The application relates to the technical field of machining equipment, and discloses a water-bulging forming machine for stainless steel pipe machining, which comprises a water-bulging forming machine body, an upper die is slidably arranged at the top of the water-bulging forming machine body, a lower die is fixedly arranged at the bottom of the water-bulging forming machine body, and a clamping block is fixedly arranged at the top of the lower die. In the process that the rotating shaft, the arc-shaped rod and the adjusting rod reciprocate up and down along with the upper die, the main pressure sensor on the top wall in the adjusting sliding groove is pressed by the adjusting ring to monitor whether the locking force of the upper die and the lower die after film combination is uniform, so that the cavity is prevented from being abraded; and in the resetting process of the arc-shaped rod and the arc-shaped block after pipe forming, the cavity abrasion is monitored in real time by the auxiliary pressure sensor, so that the operator can timely overhaul and replace the cavity when the cavity is abraded, the probability that the pipe forming defective rate is increased due to the cavity abrasion not being found in time is reduced, and the pipe machining production quality is ensured.

Description

Technical Field

[0001] This application relates to the field of machining equipment technology, and in particular to a water-expanding forming machine for processing stainless steel pipes. Background Technology

[0002] Stainless steel pipe hydroforming (also called hydraulic forming or hydroforming method) is a method that uses hydraulic pressure as a forming medium to form stainless steel pipes. It is mainly suitable for pipe fittings that require complex shapes, precise dimensions and high surface quality, and is widely used in the pipeline industry, automotive parts manufacturing and other high-end manufacturing fields.

[0003] As attached Figure 1 As shown, after the pipe to be processed is placed inside the cavity 5 opened on the upper surface of the clamping block 4, the upper mold 2 is first driven down by the drive source to make the clamping groove 6 fit and conform to the clamping block 4, and the cavity 5 opened on the lower surface of the upper mold 2 also fits against the outer surface of the pipe. Then, the drive source drives the axial punches at both ends of the pipe to move towards the pipe in the horizontal direction to seal the pipe. After sealing, liquid is introduced into the inner wall of the pipe through the liquid injection hole opened on the axial punch and pressure is continuously applied. As the axial punch continues to move, the pipe gradually deforms outward to fit and form the cavity 5. The liquid is then used to heat the stainless steel pipe from the inside. During pressurization, cavity 5 is a crucial parameter determining the shape of the pipe fitting. Under hydraulic pressure, cavity 5 endures enormous clamping and expansion forces for an extended period during the forming process, making it prone to fatigue wear, especially in the rounded corner areas where the pipe fitting deforms, which are the areas where the inner diameter of cavity 5 changes. Since the wear of cavity 5 is slow and subtle, although the diameter of the formed pipe fitting may change, it is not visible to the operator. Therefore, if the upper mold 2 and lower mold 3 are not replaced in time, the production quality of the pipe fitting will continuously fail to meet standards, leading to an increased defect rate and affecting production efficiency. Summary of the Invention

[0004] This application proposes a water-expansion forming machine for stainless steel pipe processing. It features a design where, during the reciprocating up-and-down movement of the rotating shaft, arc-shaped rod, and adjusting rod with the upper mold, the arc-shaped rod and arc-shaped block deflection via the connecting rod does not interfere with the mold closing between the upper and lower molds. Simultaneously, the main pressure sensor on the top wall of the adjusting groove monitors the uniformity of the clamping force after the upper and lower molds close, preventing cavity wear. Furthermore, during the reset process of the arc-shaped rod and arc-shaped block after pipe forming, a secondary pressure sensor monitors the cavity for wear in real time. This allows operators to promptly inspect and replace worn cavities, reducing the probability of increased defective product rates due to undetected cavity wear and ensuring the quality of pipe processing. This addresses the problem of increased defective product rates and reduced production efficiency caused by untimely mold replacement when using hydraulic water-expansion forming for pipes.

[0005] To achieve the above objectives, this application adopts the following technical solution: a water-expanding forming machine for processing stainless steel pipes, comprising a water-expanding forming machine body, an upper mold slidably mounted on the top of the water-expanding forming machine body, a lower mold fixedly mounted on the bottom of the water-expanding forming machine body, and a locking block fixedly mounted on the top of the lower mold. The bottom of the upper mold has a locking groove adapted to the locking block. Cavities are formed on the top of the locking block and the bottom of the locking groove. Several rotating shafts are rotatably mounted inside the upper mold. An arc-shaped rod is fixedly mounted on one end of each rotating shaft. An arc-shaped block is fixedly mounted on the end of the arc-shaped rod away from the rotating shaft, and a secondary pressure sensor is fixedly mounted on the end of the arc-shaped block away from the arc-shaped rod. The end of the arc-shaped block away from the arc-shaped rod is arc-shaped, and the arc-shaped block is either in contact with or separate from the inner wall of the cavity. The rotating shaft away from the arc-shaped rod... An adjusting rod is fixedly installed at one end of the upper mold. A main pressure sensor adapted to the adjusting rod is fixedly installed inside the upper mold. Both the main pressure sensor and the auxiliary pressure sensor are electrically connected to the control system. Multiple support rods are fixedly installed on the top of the lower mold, and each support rod is drivenly connected to the corresponding adjusting rod. An adjusting ring is fixedly installed at the top of the support rod and is fitted on the outside of the adjusting rod. During the process of the upper mold moving down and closing with the lower mold to assist in the forming of the pipe, the adjusting rod is driven to deflect around the axis of the rotating shaft through the transmission connection between the support rod and the adjusting rod, so that the adjusting ring applies pressure to the main pressure sensor. At the same time, the arc rod and the arc block rotate to accommodate it. After the pipe is formed, the upper mold moves up and resets. The arc rod and the arc block are reset through the transmission action of the support rod and the adjusting rod, so that the auxiliary pressure sensor is reset and pressurized.

[0006] Furthermore, the arc-shaped rod is arc-shaped, and a connecting rod is fixedly installed at the end of the rotating shaft away from the adjusting rod. The end of the connecting rod away from the rotating shaft is fixedly connected to the arc-shaped rod.

[0007] Furthermore, the upper mold has an internal groove for providing space for the connecting rod to move, and the upper mold also has an internal groove for storing the arc-shaped block, and the internal groove is connected to the internal groove.

[0008] Furthermore, the upper mold has multiple adjusting grooves inside, and each adjusting groove is adapted to a corresponding adjusting ring to provide movement space for the adjusting rod and the adjusting ring.

[0009] The beneficial effects of this invention are as follows: This application provides a water-expansion forming machine for stainless steel pipe processing. During the process of the upper mold moving down to close the lower mold, the adjusting ring limits the adjusting rod, causing the adjusting rod to drive the rotating shaft to deflect around the axis of the rotating shaft. This ensures that the deflection of the arc rod and arc block driven by the connecting rod does not interfere with the closing process of the upper and lower molds. At the same time, the adjusting ring monitors the pressure of the main pressure sensor on the top wall of the adjusting groove to ensure that the clamping force is uniform after the upper and lower molds close, preventing cavity wear. During the reset process of the arc rod and arc block after the pipe is formed, the auxiliary pressure sensor monitors the wear of the cavity in real time, allowing operators to promptly inspect and replace the cavity when wear occurs. This reduces the probability of increased defect rate due to failure to detect cavity wear in time, ensuring the quality of pipe processing. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort: Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a side view of the upper mold, lower mold, and adjusting slide of the present invention. Figure 3 This is a side view of the upper mold, lower mold, and movable groove of the present invention. Figure 4 This is a schematic diagram of the structure of the rotating shaft, arc block and adjusting rod of the present invention.

[0011] In the diagram: 1. Body of the water expansion molding machine; 2. Upper mold; 3. Lower mold; 4. Clamping block; 5. Cavity; 6. Slot; 7. Rotating shaft; 8. Arc rod; 9. Arc block; 10. Adjusting rod; 11. Support rod; 12. Connecting rod; 13. Movable groove; 14. Placement groove; 15. Adjusting ring; 16. Adjusting slide. Detailed Implementation

[0012] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0013] See Figures 1 to 4A water-expanding forming machine for processing stainless steel pipes includes a machine body 1. A hydraulic system is installed at the top of the machine body 1, and an upper mold 2 is fixedly installed at the telescopic end of the hydraulic system. A lower mold 3 is fixedly installed at the bottom of the machine body 1, positioned directly below the upper mold 2. A locking block 4 is fixedly installed at the top of the lower mold 3. A locking groove 6, matching the locking block 4, is opened at the bottom of the upper mold 2. Semi-circular cavities 5 are opened on the upper surface of the locking block 4 and the lower surface of the locking groove 6. When processing the pipe, the pipe to be processed is placed inside the cavity 5 on the locking block 4, and the upper mold is driven by the hydraulic system. 2. Move down to engage the slot 6 with the block 4. At the same time, the cavity 5 opened on the slot 6 also moves down to fit the pipe fitting. Then, the drive source drives the axial punches at both ends of the pipe fitting to move towards the pipe fitting in the horizontal direction to seal the pipe fitting. After sealing, liquid is introduced into the inner wall of the pipe fitting through the injection hole opened on the axial punch and pressure is continuously applied. As the axial punch continues to move, the pipe fitting gradually deforms outward to fit the cavity 5 and form. After forming, the hydraulic pressure is maintained for a period of time to keep the pipe fitting in its new shape. Finally, the hydraulic system drives the upper mold 2 to move up and reset, and the drive source drives the axial punch to move in the opposite direction and reset, in preparation for the next pipe fitting forming.

[0014] Multiple rotating shafts 7 are rotatably mounted inside the upper mold 2. The multiple rotating shafts 7 are arranged in an array along the axis of the cavity 5. An adjusting rod 10 is fixedly mounted on one end of the rotating shaft 7. An adjusting ring 15 is movably fitted on the outer side of the adjusting rod 10 away from the rotating shaft 7. Multiple support rods 11 are fixedly mounted on the upper surface of the lower mold 3. The top of the support rod 11 is fixedly connected to the corresponding adjusting ring 15. An adjusting groove 16 is opened inside the upper mold 2 to provide movement space for the adjusting rod 10 and the adjusting ring 15. A main pressure sensor (not shown in the figure) is fixedly mounted on the inner top wall of the adjusting groove 16. Furthermore, the main pressure sensor is electrically connected to the control system. When the upper mold 2 is in the initial position, under the limiting action of the support rod 11 and the adjusting ring 15, the adjusting rod 10 deflects downward about the axis of the rotating shaft 7. Therefore, at this time, the adjusting rod 10 is in contact with the lower bottom wall of the adjusting groove 16. As the upper mold 2 moves downward under the action of the hydraulic system, under the action of the support rod 11 and the adjusting ring 15, the adjusting rod 10 deflects upward about the axis of the rotating shaft 7, and at this time, the adjusting ring 15 gradually approaches the rotating shaft 7. When the adjusting rod 10 rotates to the horizontal position, the adjusting ring 15 is at its closest point to the rotating shaft 7. At the position of the rotating shaft 7, the adjusting rod 10 continues to deflect, and the adjusting ring 15 gradually moves away from the rotating shaft 7 until the locking block 4 and the locking groove 6 engage and fit together. At this time, the top of the adjusting ring 15 is in contact with the inner top wall of the adjusting slide 16. The adjusting ring 15 is in contact with the main pressure sensor and applies pressure to it. The support rod 11 is also placed inside the adjusting slide 16. The main pressure sensor records the pressure values ​​at various points after the upper mold 2 and the lower mold 3 are closed. After the control system processes the data, the pressure difference between the values ​​is used to determine the pressure values ​​at various points after the upper mold 2 and the lower mold 3 are closed. Whether the locking force is uniform is important. If the pressure difference is large, it indicates that the force on the mating surface is uneven after the upper mold 2 and lower mold 3 are closed. In areas with lower pressure, when hydraulic pressure acts on the cavity 5 through the pipe, the support strength of the upper mold 2 and lower mold 3 for the cavity 5 is reduced, which indirectly leads to an increase in the expansion deformation of the pipe in that area, ultimately affecting the forming quality of the pipe. Therefore, the locking force between the upper mold 2 and lower mold 3 is monitored in real time by the main pressure sensor, which makes it easier for operators to perform timely maintenance on the body 1 of the water expansion forming machine and reduce the probability of the forming quality of the pipe being unqualified due to uneven locking force.

[0015] A connecting rod 12 is fixedly installed at the end of the rotating shaft 7 away from the adjusting rod 10. An arc-shaped rod 8 is fixedly installed at the end of the connecting rod 12 away from the rotating shaft 7. The arc-shaped rod 8 is arc-shaped. An arc-shaped block 9 is fixedly installed at the end of the arc-shaped rod 8 away from the connecting rod 12. A secondary pressure sensor (not shown in the figure) is fixedly installed at the end of the arc-shaped block 9 away from the arc-shaped rod 8. The secondary pressure sensor is electrically connected to the control system. The end of the arc-shaped block 9 away from the arc-shaped rod 8 is either in contact with or separate from the inner wall of the cavity 5. The upper mold 2 has an active groove 13 inside to provide movement space for the connecting rod 12. The upper mold 2 also has a placement groove 14 inside for storing the arc-shaped block 9. The active groove 13 and the placement groove 14 are connected. When the upper mold 2 is in the initial position, the connecting rod 12 is in a vertical state. At this time, the arc-shaped block 9 is in contact with the inner wall of the cavity 5. The control system records the values ​​of each secondary pressure sensor in the initial state. When the adjusting rod 10 deflects upward around the axis of the rotating shaft 7 under the action of the support rod 11 and the adjusting ring 15, the rotating shaft 7 drives the arc rod 8 and the arc block 9 to deflect synchronously through the connecting rod 12, so that the arc block 9 no longer adheres to the inner wall of the cavity 5 and gradually moves into the placement groove 14. When the slot 6 gradually begins to engage with the slot 4, the arc block 9 has already entered the placement groove 14. Therefore, the arc rod 8 and the arc block 9 will not affect the engagement of the slot 6 and the slot 4. At this time, the adjusting rod 10 does not adhere to the inner top wall of the adjusting slide 16. As the adjusting rod 10 continues to deflect, the adjusting rod 10 only adheres to the inner top wall of the adjusting slide 16 after the slot 4 and the slot 6 are fully engaged, so as to prevent the arc rod 8 and the arc block 9 from interfering with the normal closing of the upper mold 2 and the lower mold 3.

[0016] After the current pipe fitting completes the water expansion molding, when the upper mold 2 moves upward and resets under the action of the hydraulic system, under the limiting action of the support rod 11 and the adjusting ring 15, the adjusting rod 10 rotates in the opposite direction around the axis of the rotating shaft 7 to reset, and drives the connecting rod 12 and the arc rod 8 to reset through the rotating shaft 7. The arc block 9 re-fits with the inner wall of the cavity 5. The secondary pressure sensor detects new data, and the control system monitors the data. When the data of the main pressure sensor is normal, that is, the locking force between the upper mold 2 and the lower mold 3 is uniform, if the pressure data detected by the secondary pressure sensor is not within the threshold range, or the difference between the data detected by other secondary pressure sensors is large, it indicates that there may be wear in the cavity 5 area corresponding to the secondary pressure sensor. It needs to be repaired and replaced in time to reduce the probability of substandard pipe fitting quality due to failure to detect wear in the cavity 5 in time, and to ensure production quality.

[0017] Working principle: When processing pipe fittings, the pipe fitting to be processed is placed inside the cavity 5 on the clamping block 4. The upper mold 2 is placed in the initial position. Under the limiting action of the support rod 11 and the adjusting ring 15, the adjusting rod 10 deflects downward about the axis of the rotating shaft 7. Therefore, the adjusting rod 10 is in contact with the lower bottom wall of the adjusting groove 16 at this time. At this time, the arc block 9 is also in contact with the inner wall of the cavity 5 on the upper mold 2. The values ​​of each secondary pressure sensor in the initial state are recorded by the control system. During processing, the upper mold 2 is first moved down by the hydraulic system so that the clamping groove 6 is engaged with the clamping block 4. At the same time, the clamping groove 6... The cavity 5 opened on the top is also moved down to fit the pipe fitting. Then, the axial punches at both ends of the pipe fitting in the horizontal direction are driven by the drive source to move towards the pipe fitting to seal it. After sealing, liquid is introduced into the inner wall of the pipe fitting through the injection hole opened on the axial punch and pressure is continuously applied. As the axial punch continues to move, the pipe fitting gradually deforms outward to adapt to the cavity 5 and form. After forming, the hydraulic pressure is maintained for a period of time to keep the pipe fitting in a new shape. Finally, the upper mold 2 is moved up and reset by the hydraulic system, and the axial punch is moved in the opposite direction and reset by the drive source to prepare for the next pipe fitting forming. As the upper mold 2 moves downward under the action of the hydraulic system, the adjusting rod 10 deflects upward around the axis of the rotating shaft 7 under the action of the support rod 11 and the adjusting ring 15. The adjusting ring 15 slides along the outer surface of the adjusting rod 10 until the locking block 4 engages with the locking groove 6. At this time, the top of the adjusting ring 15 is in contact with the inner top wall of the adjusting slide groove 16. The adjusting ring 15 is in contact with the main pressure sensor and applies pressure to it. The support rod 11 is also placed inside the adjusting slide groove 16. The main pressure sensor records the pressure values ​​at various points after the upper mold 2 and the lower mold 3 are closed. After the control system processes the data, it analyzes the pressure values ​​between various values. The pressure difference is used to determine whether the locking force at each point is uniform after the upper mold 2 and the lower mold 3 are closed. If the pressure difference is large, it means that the force on the closing surface is uneven after the upper mold 2 and the lower mold 3 are closed. In areas with lower pressure, when hydraulic pressure is applied to the cavity 5 through the pipe, the support strength of the upper mold 2 and the lower mold 3 to the cavity 5 is reduced, which indirectly leads to an increase in the expansion deformation of the pipe in this area, ultimately affecting the forming quality of the pipe. Therefore, the locking force between the upper mold 2 and the lower mold 3 is monitored in real time by the main pressure sensor, which makes it easier for operators to perform timely maintenance on the body 1 of the water expansion forming machine and reduce the probability of the forming quality of the pipe being unqualified due to uneven locking force. When the adjusting rod 10 deflects upward around the axis of the rotating shaft 7 under the action of the support rod 11 and the adjusting ring 15, the rotating shaft 7 drives the arc rod 8 and the arc block 9 to deflect synchronously through the connecting rod 12, so that the arc block 9 no longer fits against the inner wall of the cavity 5 and gradually moves into the placement groove 14 to prevent the arc rod 8 and the arc block 9 from interfering with the normal mold closing of the upper mold 2 and the lower mold 3. After the current pipe fitting completes the water expansion molding, when the upper mold 2 moves upward and resets under the action of the hydraulic system, the adjusting rod 10 rotates in the opposite direction around the axis of the rotating shaft 7 and resets under the limiting action of the support rod 11 and the adjusting ring 15, and drives the rotating shaft 7 to drive the upper mold 2 to reset. Connecting rod 12 and arc rod 8 are reset, and arc block 9 re-fits the inner wall of cavity 5. The secondary pressure sensor detects new data, and the control system monitors the data. When the main pressure sensor data is normal, that is, when the locking force between the upper mold 2 and the lower mold 3 is uniform, if the pressure data detected by the secondary pressure sensor is not within the threshold range, or the difference between the data detected by other secondary pressure sensors is large, it indicates that there may be wear in the cavity 5 area corresponding to the secondary pressure sensor. It needs to be repaired and replaced in time to reduce the probability of substandard pipe quality due to failure to detect wear in cavity 5 in time, and to ensure production quality.

[0018] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A water-expanding forming machine for processing stainless steel pipes, comprising a water-expanding forming machine body (1), wherein an upper mold (2) is slidably mounted on the top of the water-expanding forming machine body (1), and a lower mold (3) is fixedly mounted on the bottom of the water-expanding forming machine body (1), characterized in that, It also includes a locking block (4) fixedly installed on the top of the lower mold (3). The bottom of the upper mold (2) is provided with a locking groove (6) that matches the locking block (4). Both the top of the locking block (4) and the bottom of the locking groove (6) are provided with cavities (5). Several rotating shafts (7) are rotatably installed inside the upper mold (2). One end of each rotating shaft (7) is fixedly installed with an arc-shaped rod (8). The arc-shaped rod (8) is arc-shaped and is located away from the rotating shaft (3). 7) One end of the shaft (7) is fixedly installed with an arc-shaped block (9), and the end of the arc-shaped block (9) away from the arc-shaped rod (8) is fixedly installed with a secondary pressure sensor. The end of the arc-shaped block (9) away from the arc-shaped rod (8) is arc-shaped, and the arc-shaped block (9) is either in contact with or separate from the inner wall of the cavity (5). The end of the shaft (7) away from the arc-shaped rod (8) is fixedly installed with an adjusting rod (10). The upper mold (2) is fixedly installed with a main pressure sensor that is compatible with the adjusting rod (10). The sensor, and both the main pressure sensor and the auxiliary pressure sensor are electrically connected to the control system. The top of the lower mold (3) is fixedly installed with multiple support rods (11), and each support rod (11) is connected to the corresponding adjusting rod (10) in a transmission manner. The top of the support rod (11) is fixedly installed with an adjusting ring (15), and the adjusting ring (15) is fitted on the outside of the adjusting rod (10). During the process of the upper mold (2) moving down and closing the mold with the lower mold (3) to assist in the forming of the pipe, the adjustment rod (10) is driven to deflect around the axis of the rotating shaft (7) through the transmission connection between the support rod (11) and the adjusting rod (10), so that the adjusting ring (15) applies pressure to the main pressure sensor. At the same time, the arc rod (8) and the arc block (9) are rotated to accommodate it. After the pipe is formed, the upper mold (2) moves up and resets, and the arc rod (8) and the arc block (9) are reset through the transmission action of the support rod (11) and the adjusting rod (10), so that the auxiliary pressure sensor is reset and pressurized.

2. The stainless steel pipe processing water expansion forming machine according to claim 1, characterized in that, A connecting rod (12) is fixedly installed at the end of the rotating shaft (7) away from the adjusting rod (10), and the end of the connecting rod (12) away from the rotating shaft (7) is fixedly connected to the arc rod (8).

3. The stainless steel pipe processing water expansion forming machine according to claim 2, characterized in that, The upper mold (2) has an active groove (13) inside that provides space for the connecting rod (12) to move. The upper mold (2) also has a placement groove (14) inside that is used to store the arc block (9). The active groove (13) and the placement groove (14) are connected.

4. A water-expansion forming machine for processing stainless steel pipes according to claim 3, characterized in that, The upper mold (2) has multiple adjustment grooves (16) inside, and each adjustment groove (16) is adapted to the corresponding adjustment ring (15) to provide movement space for the adjustment rod (10) and the adjustment ring (15).

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