Thin-wall elbow machining equipment and machining method thereof

Abstract

The invention relates to thin-wall elbow machining equipment and a machining method thereof, and belongs to the field of elbow machining equipment.The thin-wall elbow machining equipment comprises a rack, an upper die and a lower die, the lower die is fixedly arranged on the rack, the upper die and the lower die are vertically and oppositely arranged, the upper die is driven by a first oil cylinder to ascend and descend, and the lower die is driven by a second oil cylinder to ascend and descend; the bottom of the upper die is an arc-shaped face, an arc-shaped groove is formed in the top of the lower die, and the arc-shaped face is matched with the arc-shaped groove. In the bending process, the steel pipe is filled with air, the air pressure in the steel pipe is increased, and through the air pressure effect, the steel pipe is prevented from being shrunken in the bending process; the bottom of the steel pipe is ensured to be attached to the inner side wall of the arc-shaped groove in the steel pipe bending process, the air pressure in the steel pipe during bending is detected through the air pressure sensor, whether the steel pipe cracks or not is detected, secondly, in the process that the extrusion rod is pulled out of the straight pipe part, the extrusion rod and the straight pipe part are always kept in a coaxial state, friction force during pulling out can be reduced, and production efficiency is improved. The inner wall of the steel pipe is prevented from being abraded.

Description

Technical Field

[0001] The invention relates to thin-wall elbow processing equipment and a processing method thereof, belonging to the field of elbow processing equipment. Background Art

[0002] Elbow is a commonly used connecting pipe fitting in pipeline installation, which connects two pipes with the same or different nominal diameters to make the pipeline turn at a certain angle; traditional elbow processing and forming processes include stamping, welding and cold pushing.

[0003] The Chinese utility model patent with announcement number CN219851551U discloses a thin-wall elbow pipe joint bending facility belonging to the field of processing facilities. The frame is connected to a pressing cylinder bracket, a die, and a core-pulling cylinder bracket. The pressing cylinder bracket is connected to the pressing cylinder and a moment switch. The pressing cylinder is connected to the punch. The core-pulling cylinder bracket is connected to the core-pulling cylinder. The core-pulling cylinder is connected to the core-pulling wire. The moment switch is connected to an electric-controlled reversing valve and a power distribution cabinet installed on a hydraulic pump station through power lines, respectively. The pressing cylinder and the core-pulling cylinder are connected to the front and rear channels of the electric-controlled reversing valve installed inside the frame through hydraulic oil pipes, respectively. The electric-controlled reversing valve is connected to the hydraulic pump station through hydraulic oil pipes. A cylindrical core-pulling wire is used to fill the inside of the steel pipe, the convex and concave dies are pressed, and the V-shaped die groove bends the steel pipe to prevent the steel pipe from being squeezed. The core-pulling cylinder pulls out a straight core-pulling wire to prevent the steel pipe from being scratched and producing waste. However, in the prior art, core-pulling wire is used to fill the interior of the steel pipe. When the bending is completed and the core-pulling wire is pulled out, the friction between the inner wall of the steel pipe and the suction wire increases because the steel pipe has been bent. The inner wall of the steel pipe is easily worn during the process of pulling out the core-pulling wire, thereby affecting the product quality.

[0004] Therefore, there is a need for a thin-wall elbow processing equipment and a processing method thereof to avoid wear on the inner wall of the steel pipe and improve product quality. Summary of the invention

[0005] The technical problem to be solved by the present invention is: in order to overcome the deficiencies of the prior art, to provide a thin-wall elbow processing device and a processing method thereof to avoid wear on the inner wall of a steel pipe and improve product quality.

[0006] The technical solution adopted by the present invention to solve the above problems is: a thin-wall elbow processing equipment, including a frame, an upper die and a lower die, the lower die is fixedly arranged on the frame, the upper die and the lower die are arranged vertically opposite to each other, the upper die is driven to rise and fall by a first oil cylinder, the bottom of the upper die is an arc surface, the top of the lower die is provided with an arc groove, the arc surface matches the arc groove, and two filling mechanisms are provided on the frame, and the two filling mechanisms are symmetrically arranged on both sides of the lower die; The filling mechanism includes an extrusion rod, a movable plate and a lifting block. The movable plate is connected to a translation system, and the translation system is used to drive the movable plate to move horizontally toward or away from the lower mold. The extrusion rod is horizontally arranged, and a pin is inserted into one end of the extrusion rod. The pin is fixedly set on the lifting block. The extrusion rod is connected to the lifting block through an elastic member, and a lifting system is arranged on the lifting block, and the lifting block is driven to rise and fall by the lifting system.

[0007] Preferably, the translation system is a second oil cylinder, a cylinder body of the second oil cylinder is fixedly connected to the frame, and a piston end of the second oil cylinder is fixedly connected to the movable plate.

[0008] Preferably, the elastic member is a torsion spring, and two ends of the torsion spring are respectively connected to the extrusion rod and the lifting block.

[0009] Preferably, the lifting system includes a lead screw, which is arranged vertically, one end of which is connected to a driving source, the lifting block is threadedly connected to the lead screw, a guide rod is vertically passed through the lifting block, and both ends of the guide rod are fixedly connected to the movable plate.

[0010] Preferably, the outer peripheral wall of the extrusion rod is covered with a flexible sealing layer.

[0011] Preferably, an air pressure sensor is provided at one end of the extrusion rod away from the pin shaft.

[0012] A method for processing a thin-wall elbow comprises the following steps: Step 1: Place the steel pipe horizontally in the arc groove, and the two ends of the steel pipe extend to the two sides of the lower die respectively. At this time, the two extrusion rods are coaxially distributed on both sides of the steel pipe; Step 2: The moving plate is moved horizontally toward the lower die through the translation system, that is, the end of the extrusion rod away from the pin is driven to be inserted into the steel pipe. Through calculation, the extrusion rod and the inner wall of the steel pipe are sealed; Step 3: The upper die is driven down by the first oil cylinder so that the arc surface squeezes the top of the steel pipe, thereby deforming the steel pipe and making the top of the steel pipe fit with the inner wall of the arc groove, thus achieving bending; During the bending process, the middle of the steel pipe is bent, and the two ends of the steel pipe are warped. When the ends of the steel pipe are warped, the lifting block is driven to rise by the lifting system. The rising speed of the lifting block is determined according to the warping speed of the ends of the steel pipe. In addition, with the warping of the ends of the steel pipe and the rise of the lifting block, the extrusion rod rotates around the pin shaft. At the same time, the second oil cylinder drives the moving plate to move horizontally toward the lower die again, so that the depth of the extrusion rod inserted into the steel pipe increases, and the air between the two extrusion rods in the steel pipe is squeezed, that is, the air is filled into the steel pipe, thereby increasing the air pressure in the steel pipe. Under the action of the air pressure, the steel pipe is prevented from being squeezed during the bending process, and it is ensured that the bottom of the steel pipe fits the inner wall of the arc groove during the bending process of the steel pipe; Step 4: The moving plate is moved horizontally away from the lower die through the translation system. While the moving plate is moving, the lifting block is driven to continue to rise through the lifting system, so that the depth of the extrusion rod inserted into the steel pipe is reduced. When the extrusion rod is separated from the steel pipe, the extrusion rod is rotated in the opposite direction around the pin shaft to a horizontal state through the elastic member; Step 5: After the upper die is driven to rise and separate from the steel pipe by the first oil cylinder, the bent steel pipe is taken out; Step 6: Drive the lifting block down through the lifting system until it is reset; Preferably, steps 1 to 6 are repeated to perform the bending operation of the next steel pipe.

[0013] Preferably, in step 3, the steel pipe after bending consists of a bending portion and two straight pipe portions, and the two straight pipe portions are respectively located at both ends of the bending portion. During the bending process, the extrusion rod is always inserted into the straight pipe portion, and during the process of withdrawing the extrusion rod from the straight pipe portion, the extrusion rod always remains coaxial with the straight pipe portion.

[0014] Preferably, in step 3, the sealing between the extrusion rod and the steel pipe is improved by a sealing layer, and the air pressure in the steel pipe is detected by an air pressure sensor.

[0015] Compared with the prior art, the advantages of the present invention are: The present invention provides a thin-wall elbow processing equipment and a processing method thereof. During the bending process, air is filled into a steel pipe to increase the air pressure in the steel pipe. The air pressure can prevent the steel pipe from being squeezed during the bending process, and ensure that the bottom of the steel pipe fits the inner wall of the arc groove during the bending process. Moreover, the air pressure in the steel pipe during bending is detected by an air pressure sensor to detect whether cracks occur in the steel pipe. Secondly, during the process of withdrawing the extrusion rod from the straight pipe portion, the extrusion rod always maintains a coaxial state with the straight pipe portion. In this way, the friction during withdrawal can be reduced, the wear of the inner wall of the steel pipe can be avoided, and the product quality can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional diagram of a thin-wall elbow processing device of the present invention; Figure 2 This is a schematic diagram of the structure of the filling mechanism; Figure 3 A three-dimensional diagram of the upper die; Figure 4 is a three-dimensional diagram of the lower mold; Figure 5 is a cross-sectional view of the lower die; Figure 6 This is a three-dimensional picture of the steel pipe after bending; Figure 7 It is a structural diagram of step 1; Figure 8It is a structural diagram of step 2; Fig. 9 It is a structural diagram of step 3; Fig.10 This is a schematic diagram of the structure of step 4.

[0017] in: Frame 1, upper die 2, lower die 3, first oil cylinder 4, arc surface 5, arc groove 6, filling mechanism 7, steel pipe 8; Extrusion rod 71, moving plate 72, lifting block 73, second oil cylinder 74, pin 75, lead screw 76, motor 77, guide rod 78; Bend portion 81 and straight pipe portion 82. DETAILED DESCRIPTION

[0018] like Figure 1-6 As shown, a thin-wall elbow processing equipment in this embodiment includes a frame 1, an upper die 2 and a lower die 3, the lower die 3 is fixedly arranged on the frame 1, the upper die 2 and the lower die 3 are arranged vertically opposite to each other, the upper die 2 is driven to rise and fall by a first oil cylinder 4, the bottom of the upper die 2 is an arc surface 5, the top of the lower die 3 is provided with an arc groove 6, the arc surface 5 matches the arc groove 6, and two filling mechanisms 7 are provided on the frame 1, and the two filling mechanisms 7 are symmetrically arranged on both sides of the lower die 3; The filling mechanism 7 includes an extrusion rod 71, a movable plate 72 and a lifting block 73, the movable plate 72 is connected with a translation system, the translation system is used to drive the movable plate 72 to move horizontally toward or away from the lower mold 3, wherein the translation system is a second oil cylinder 74, the cylinder body of the second oil cylinder 74 is fixedly connected to the frame 1, the piston end of the second oil cylinder 74 is fixedly connected to the movable plate 72, the extrusion rod 71 is horizontally arranged, one end of the extrusion rod 71 is inserted with a pin 75, the pin 75 is fixedly set on the lifting block 73, the extrusion rod 71 is connected to the lifting block 73 through an elastic member, wherein the elastic member is a torsion spring (not shown in the figure), the two ends of the torsion spring are respectively connected to the extrusion rod 71 and the lifting block 73, the lifting block 73 is provided with a lifting system, and the lifting block 73 is driven to rise and fall by the lifting system; The lifting system includes a lead screw 76, which is arranged vertically. One end of the lead screw 76 is connected to a driving source, which may be a motor 77. The housing of the motor 77 is fixedly connected to the movable plate 72. The lifting block 73 is threadedly connected to the lead screw 76. A guide rod 78 is vertically penetrated on the lifting block 73. Both ends of the guide rod 78 are fixedly connected to the movable plate 72. During the start-up process of the motor 77, the lead screw 76 is rotated to make the lifting block 73 rise and fall on the lead screw 76. The cooperation between the lifting block 73 and the guide rod 78 serves as a guide when the lifting block 73 is lifted and lowered. The outer peripheral wall of the extrusion rod 71 is paved with a flexible sealing layer (not shown in the figure), and an air pressure sensor (not shown in the figure) is arranged at one end of the extrusion rod 71 away from the pin shaft 75; like Figure 7-10 As shown, a method for processing a thin-wall elbow comprises the following steps: Step 1, place the steel pipe 8 horizontally in the arc groove 6, and the two ends of the steel pipe 8 extend to the two sides of the lower mold 3 respectively. At this time, the two extrusion rods 71 ​​are coaxially distributed on the two sides of the steel pipe 8; Step 2: The moving plate 72 is moved horizontally toward the lower die 3 by the translation system, that is, the end of the extrusion rod 71 away from the pin 75 is driven to be inserted into the steel pipe 8. According to calculation, the extrusion rod 71 and the inner wall of the steel pipe 8 are sealed; Step 3, the upper die 2 is driven down by the first oil cylinder 4, so that the arc surface 5 squeezes the top of the steel pipe 8, thereby deforming the steel pipe 8 and making the top of the steel pipe 8 fit with the inner wall of the arc groove 6, that is, achieving bending; During the bending process, the middle part of the steel pipe 8 is bent, and the two ends of the steel pipe 8 are warped. When the end of the steel pipe 8 is warped, the lifting block 73 is driven to rise by the lifting system. The rising speed of the lifting block 73 is determined according to the warping speed of the end of the steel pipe 8. In addition, with the warping of the end of the steel pipe 8 and the rise of the lifting block 73, the extrusion rod 71 rotates around the pin 75. At the same time, the second oil cylinder 74 drives the moving plate 72 to move horizontally toward the lower mold 3 again, so that the depth of the extrusion rod 71 inserted into the steel pipe 8 increases, so that the air between the two extrusion rods 71 ​​in the steel pipe 8 is squeezed, that is, the air is filled into the steel pipe 8, so that the air pressure in the steel pipe 8 is increased. Under the action of the air pressure, the steel pipe 8 is prevented from being squeezed during the bending process, and it is ensured that the bottom of the steel pipe 8 fits the inner wall of the arc groove 6 during the bending process of the steel pipe 8; Here, the steel pipe 8 after bending is composed of a bending portion 81 and two straight pipe portions 82. The two straight pipe portions 82 are respectively located at the two ends of the bending portion 81. During the bending process, the extrusion rod 71 is always inserted into the straight pipe portion 82. During the process of the extrusion rod 71 being withdrawn from the straight pipe portion 82, the extrusion rod 71 always maintains a coaxial state with the straight pipe portion 82. In this way, the friction during withdrawal can be reduced, the wear of the inner wall of the steel pipe 8 can be avoided, and the product quality can be improved. The sealing layer improves the sealing performance between the extrusion rod 71 and the steel pipe 8. During the bending process, the air pressure in the steel pipe 8 is detected by the air pressure sensor, and the air pressure value is used to detect whether there are cracks in the steel pipe 8. At the same time, it is also convenient to control the distance of the extrusion rod 71 inserted into the straight pipe part 82 according to the air pressure. Step 4: The moving plate 72 is horizontally moved away from the lower mold 3 by the translation system. While the moving plate 72 is moving, the lifting block 73 is driven to continue to rise by the lifting system, so that the depth of the extrusion rod 71 inserted into the steel pipe 8 is reduced. When the extrusion rod 71 is separated from the steel pipe 8, the extrusion rod 71 is reversely rotated around the pin 75 to a horizontal state by the elastic member. Step 5: After the upper die 2 is driven to rise and separate from the steel pipe 8 by the first oil cylinder 4, the bent steel pipe 8 is taken out; Step 6: Drive the lifting block 73 downward through the lifting system until it is reset; Repeat steps 1 to 6 to perform the bending operation of the next steel pipe 8; In summary, during the bending process, air is filled into the steel pipe 8 to increase the air pressure in the steel pipe 8. The air pressure can prevent the steel pipe 8 from being squeezed during the bending process, and ensure that the bottom of the steel pipe 8 fits the inner wall of the arc groove 6 during the bending process. Moreover, the air pressure sensor detects the air pressure in the steel pipe 8 during the bending process, which can be used to detect whether cracks occur in the steel pipe 8. Secondly, during the process of the extrusion rod 71 being pulled out from the straight pipe portion 82, the extrusion rod 71 always maintains a coaxial state with the straight pipe portion 82. In this way, the friction during the extraction can be reduced, the wear of the inner wall of the steel pipe 8 can be avoided, and the product quality can be improved. In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. A thin-wall elbow processing device, comprising a frame (1), an upper die (2) and a lower die (3), wherein the lower die (3) is fixedly arranged on the frame (1), the upper die (2) and the lower die (3) are arranged vertically opposite to each other, the upper die (2) is driven to rise and fall by a first oil cylinder (4), the bottom of the upper die (2) is an arc surface (5), the top of the lower die (3) is provided with an arc groove (6), the arc surface (5) matches the arc groove (6), and is characterized in that: The frame (1) is provided with two filling mechanisms (7), and the two filling mechanisms (7) are symmetrically arranged on both sides of the lower mold (3); The filling mechanism (7) comprises an extrusion rod (71), a movable plate (72) and a lifting block (73); the movable plate (72) is connected to a translation system, the translation system is used to drive the movable plate (72) to move horizontally in a direction close to or away from the lower mold (3); the extrusion rod (71) is arranged horizontally, a pin shaft (75) is inserted through one end of the extrusion rod (71), the pin shaft (75) is fixedly arranged on the lifting block (73); the extrusion rod (71) is connected to the lifting block (73) through an elastic member, and the lifting block (73) is provided with a lifting system, and the lifting block (73) is driven to move up and down by the lifting system.

2. The thin-wall elbow processing equipment according to claim 1 is characterized in that: The translation system is a second oil cylinder (74), the cylinder body of the second oil cylinder (74) is fixedly connected to the frame (1), and the piston end of the second oil cylinder (74) is fixedly connected to the moving plate (72).

3. The thin-wall elbow processing equipment according to claim 1 is characterized in that: The elastic member is a torsion spring, and two ends of the torsion spring are respectively connected to the extrusion rod (71) and the lifting block (73).

4. The thin-wall elbow processing equipment according to claim 1 is characterized in that: The lifting system comprises a lead screw (76), the lead screw (76) being arranged vertically, one end of the lead screw (76) being connected to a driving source, the lifting block (73) being threadedly connected to the lead screw (76), a guide rod (78) being vertically penetrated through the lifting block (73), and both ends of the guide rod (78) being fixedly connected to the moving plate (72).

5. The thin-wall elbow processing equipment according to claim 1 is characterized in that: The outer peripheral wall of the extrusion rod (71) is provided with a flexible sealing layer.

6. The thin-wall elbow processing equipment according to claim 1, characterized in that: An air pressure sensor is provided at one end of the extrusion rod (71) away from the pin shaft (75).

7. A method for processing a thin-wall elbow, characterized in that: The steps include: Step 1: Place the steel pipe (8) horizontally in the arc-shaped groove (6), and extend the two ends of the steel pipe (8) to the two sides of the lower die (3) respectively. At this time, the two extrusion rods (71) are coaxially distributed on the two sides of the steel pipe (8); Step 2: The movable plate (72) is moved horizontally toward the lower die (3) by means of a translation system, so that the end of the extrusion rod (71) away from the pin (75) is inserted into the steel pipe (8). According to calculation, the extrusion rod (71) and the inner wall of the steel pipe (8) are sealed. Step 3, driving the upper die (2) to descend by the first oil cylinder (4), so that the arc surface (5) squeezes the top of the steel pipe (8), thereby deforming the steel pipe (8) and making the top of the steel pipe (8) fit with the inner wall of the arc groove (6), thus achieving bending; During the bending process, the middle of the steel pipe (8) bends, and the two ends of the steel pipe (8) are tilted upward. When the end of the steel pipe (8) is tilted upward, the lifting block (73) is driven to rise by the lifting system. The rising speed of the lifting block (73) is determined according to the rising speed of the end of the steel pipe (8). In addition, as the end of the steel pipe (8) is tilted upward and the lifting block (73) rises, the extrusion rod (71) rotates around the pin shaft (75). At the same time, the second oil cylinder (74) drives the movable plate (72) to move horizontally again toward the lower mold (3), so that the depth of the extrusion rod (71) inserted into the steel pipe (8) increases, so that the air between the two extrusion rods (71) in the steel pipe (8) is squeezed, that is, the air is filled into the steel pipe (8), thereby increasing the air pressure in the steel pipe (8). Under the action of the air pressure, the steel pipe (8) is prevented from being squeezed during the bending process, and it is ensured that the bottom of the steel pipe (8) is in contact with the inner wall of the arc groove (6) during the bending process. Step 4: The movable plate (72) is moved horizontally in a direction away from the lower mold (3) by means of the translation system. While the movable plate (72) is moving, the lifting block (73) is driven to continue to rise by means of the lifting system, so that the depth of the extrusion rod (71) inserted into the steel pipe (8) is reduced. When the extrusion rod (71) is separated from the steel pipe (8), the extrusion rod (71) is rotated in the opposite direction around the pin shaft (75) to a horizontal state by means of the elastic member. Step 5: After the upper die (2) is driven to rise by the first oil cylinder (4) and separated from the steel pipe (8), the bent steel pipe (8) is taken out; Step 6: The lifting block (73) is driven down by the lifting system until it is reset.

8. A method for processing a thin-wall elbow according to claim 7, characterized in that: Repeat steps 1 to 6 to perform the bending operation of the next steel pipe (8).

9. A method for processing a thin-wall elbow according to claim 7, characterized in that: In step 3, the steel pipe (8) after bending is composed of a bent portion (81) and two straight pipe portions (82), the two straight pipe portions (82) being located at two ends of the bent portion (81), respectively. During the bending process, the extrusion rod (71) is always inserted into the straight pipe portion (82), and during the process of the extrusion rod (71) being withdrawn from the straight pipe portion (82), the extrusion rod (71) always maintains a coaxial state with the straight pipe portion (82).

10. A method for processing a thin-wall elbow according to claim 7, characterized in that: In the step 3, the sealing performance between the extrusion rod (71) and the steel pipe (8) is improved by the sealing layer, and the air pressure in the steel pipe (8) is detected by the air pressure sensor.

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