Intelligent bent pipe punch forming equipment and method

Abstract

The invention discloses intelligent bent pipe punch forming equipment and method, and relates to the technical field of pipe fitting punch forming, the intelligent bent pipe punch forming equipment comprises a machine body and a pipe blank, the machine body is provided with a die mechanism, a pushing mechanism and an elbow core rod provided with a first quick release assembly, and the die mechanism comprises an upper die and a lower die which are fixed to the machine body; the upper die and the lower die are respectively provided with forming runners which are matched with each other, and the tube blank is placed in the forming runner of the lower die. By arranging the pressure feedback mechanism and the lubricating oil spraying mechanism, the friction force between the pipe blank and the elbow core rod is converted into the pressure value change in the pressure detection cavity and transmitted to the piezoelectric sensor, the piezoelectric sensor feeds back the pressure value to the control unit, and the control unit can control the rotating speed of the oil pump according to the pressure value. The larger the friction force between the pipe blank and the elbow core rod is, the higher the rotating speed of the oil pump is, the more lubricating oil is sprayed out of the oil spraying holes, the intelligent degree of lubrication is improved, and the stamping effect is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe stamping and forming, and in particular to intelligent pipe bending stamping and forming equipment and method. Background Art

[0002] The cold bending machine mainly uses the plasticity of metal at room temperature to push the tube blank in the mold through mechanical force to bend and deform, thereby forming an elbow. Taking the mold cold bending as an example, it presses the tube blank into a mold with a bending cavity on an ordinary hydraulic press or crank press, so that the tube blank is bent into an elbow according to the shape of the mold.

[0003] During the cold push tube bending process, the push rod pushes the tube to move to one side of the elbow mold. There is a large friction between the inner wall of the tube and the elbow mold. During the forming process, it is necessary to manually spray lubricating oil to reduce friction and prevent excessive friction from causing forming defects on the inner surface of the elbow or even failure to form. However, the existing method of spraying lubricating oil is manual spraying, which is a habitual action of workers. There is no clear standard for the amount of lubricating oil and the spraying frequency, and the method of judging by the human eye lacks effectiveness. There is too little lubricating oil, resulting in poor forming of the tube and difficulty in demolding, or too much lubricating oil, resulting in waste of lubricating oil.

[0004] The Chinese patent application number 201710603323.3 discloses a cold-pushing elbow processing method and a core mechanism used in the method. The elbow mold is set to a multi-stage type so that it can produce a variable diameter. When the material is withdrawn, the diameter is reduced to facilitate demolding. However, although this invention improves the problem of difficulty in demolding between the elbow and the mold, it does not solve the problem of excessive friction between the inner wall of the elbow and the mold during the elbow forming process. Moreover, the frequent diameter changes of the elbow will inevitably cause wear after long-term use. When the elbow mold cannot be reset to its original position, it is inevitable that the inner diameter of the elbow will not meet the standard.

[0005] At the same time, in order to reduce the resistance of the tube billet during the advancement process, the two sides of the tube billet are usually set as inclined surfaces, which can not only enter the die more smoothly, but also promote uniform deformation, so that the metal is more evenly distributed and flows in the initial stage of bending. However, in the process of cooperating with the push rod, the contact surface between the push rod and the tube billet is too small. When the friction between the tube billet and the die is large, the problem of the tube billet end not being formed will occur.

[0006] To this end, the present invention proposes an intelligent tube bending stamping forming device and method to solve the above problems. Summary of the invention

[0007] The purpose of the present invention is to provide an intelligent pipe bending stamping forming device and method to solve the technical problems proposed in the above background technology that manual spraying of lubricating oil lacks stability and excessive friction caused by assembly errors when the block and the slot are positioned.

[0008] To achieve the above-mentioned object, the present invention provides the following technical solutions: an intelligent bending tube stamping forming device, comprising a machine body and a tube blank, the machine body is provided with a mold mechanism, a propulsion mechanism and an elbow mandrel provided with a first quick-release assembly, the mold mechanism comprises an upper mold and a lower mold fixed on the machine body, the upper mold and the lower mold are respectively provided with mutually matching forming flow channels, and the tube blank is placed in the forming flow channel of the lower mold; The propulsion mechanism comprises a driving cylinder fixedly mounted on the machine body, the output shaft of the driving cylinder is fixedly connected to a push rod, and a second quick-release assembly is arranged on a side of the push rod away from the driving cylinder; The first quick-release assembly and the second quick-release assembly include a first quick-release head and a second quick-release head, one side of the first quick-release head and the second quick-release head are respectively fixedly connected with two symmetrically arranged positioning pins, the elbow mandrel and the push rod are respectively provided with positioning holes matching the positioning pins at one end close to the tube blank, and the first quick-release head and the second quick-release head are respectively provided with notches that engage with each other; Both ends of the tube blank are arranged with inclined surfaces, and one side of the tube blank is arranged with a protrusion matched with the second quick-release head.

[0009] Preferably, a pressure feedback mechanism is provided inside the second quick-release head, a lubricating oil spraying mechanism is provided inside the first quick-release head, an oil passage is provided inside the elbow mandrel, a connector connected to the passage is fixedly connected to the outer wall of the elbow mandrel, and the connector is externally connected to an oil supply device; The pressure feedback mechanism can detect the friction between the inner wall of the tube blank and the elbow mandrel, and send a piezoelectric signal to the oil supply device. The greater the friction, the greater the oil supply of the oil supply device.

[0010] Preferably, the pressure feedback mechanism includes a pressure plate, a slot is provided on the second quick-release head, the pressure plate slides in the slot and cooperates with the slot to form a pressure detection chamber, a piezoelectric sensor is arranged in the pressure detection chamber, and the piezoelectric sensor is connected to the electrical signal of the oil supply equipment.

[0011] Preferably, the lubricating oil spraying mechanism includes an oil chamber located in the first quick-release head, an oil inlet pipe connected to the oil chamber is provided on one side of the first quick-release head, the oil inlet pipe matches the oil channel, and a plurality of circumferentially evenly distributed oil spray holes are opened on the outer wall of the second quick-release head.

[0012] Preferably, an inner box is rotatably connected in the oil chamber, a plurality of through holes matching the oil injection holes are provided on the side wall of the inner box, in the initial state, the through holes and the oil injection holes are staggered, a connecting column is coaxially fixed on the inner box, a movable plate matching with the oil inlet pipe seal is provided in the oil chamber, a plurality of limit rods matching with the movable plate are fixed on the inner wall of the oil chamber, a sleeve is coaxially fixed on the side of the movable plate away from the oil inlet pipe, the sleeve is coaxially arranged with the connecting column, a spiral track is provided on the circumferential side of the connecting column, and a connecting block meshing with the spiral track is provided on the inner wall of the sleeve; When the movable plate is pushed by the lubricating oil and moves toward the inner box, the inner box rotates under the action of the connecting block and the spiral track.

[0013] Preferably, the movable plate is provided with a plurality of limiting holes matching the limiting rods, and the ends of the plurality of limiting rods away from the movable plate are all threadedly connected with limiting nuts, and a first elastic member is provided between the limiting nut and the movable plate.

[0014] Preferably, a card slot is provided at the notch of the first quick-release head, the pressure plate is an annular structure and a card block matching the card slot is provided on one side, an adaptive adjustment mechanism is provided between the card block and the pressure plate, and when the card block is engaged with the card slot, if the friction force of the card block and the card slot is too large due to assembly error, the adaptive adjustment mechanism can adjust the position of the card block according to the magnitude of the friction force.

[0015] Preferably, the adaptive adjustment mechanism comprises a mounting groove provided on the pressure plate, one end of the clamping block close to the mounting groove is fixedly connected to the mounting plate, one end of the mounting plate located in the mounting groove is fixedly connected to the adjustment plate, the adjustment plate is sealingly and slidably connected to the mounting groove, the adjustment plate divides the mounting groove into an upper cavity and a lower cavity, and the upper cavity and the lower cavity are both filled with hydraulic oil; A flow channel is opened on one side of the regulating groove, and a one-way valve is arranged in the flow channel. The hydraulic oil in the upper chamber can enter the lower chamber through the one-way valve.

[0016] Preferably, the one-way valve member comprises a one-way cavity, a sealing ball is arranged on a side of the one-way cavity close to the upper cavity, and a second elastic member is arranged between the sealing ball and the one-way cavity.

[0017] A method for stamping and forming an intelligent pipe bend, comprising the following steps: Step 1: Install the first quick-release head and the second quick-release head on the ends of the elbow core rod and the push rod respectively, and ensure that the notches of the two can bite each other; Step 2: Install the card block in the installation slot, and in the initial state, make the volume of the upper chamber larger than the volume of the lower chamber; Step 3: Start the drive cylinder, and the push rod drives the first quick release head to approach and engage with the second quick release head, so that the block is adaptively adjusted according to the size of the friction force during the engagement process, and then the drive cylinder is reset; Step 4: Place the tube blank in the forming runner, with the end with the protrusion facing the first quick-release head; Step 5: After the upper die and the lower die are engaged, the driving cylinder is started, and the tube blank is sleeved on the elbow mandrel under the punching of the push rod and the first quick-release head and gradually formed into an elbow; Step 6: The upper die is separated from the lower die, the elbow mandrel is flipped to one side, and the material is unloaded mechanically or manually.

[0018] The beneficial effects of the present invention are: 1. The present invention increases the contact area between the tube blank and the push rod by means of the protrusion, the first quick-release assembly and the second quick-release assembly arranged on one side of the tube blank, thereby preventing the tube blank from being deformed when the friction force is large due to the small contact surface between the tube blank and the push rod, thereby reducing the defective rate of the tube blank; at the same time, the first quick-release assembly and the second quick-release assembly enable the matching surfaces of the elbow core rod and the push rod to be quickly released and easy to replace. When both are greatly worn or reach the end of their service life, the first quick-release head and the second quick-release head can be replaced by pulling out and plugging the pin shaft, which is more time-saving and labor-saving.

[0019] 2. The present invention provides a pressure feedback mechanism and a lubricating oil spraying mechanism, so that the friction between the tube blank and the elbow mandrel is converted into a pressure value change in the pressure detection chamber and transmitted to the piezoelectric sensor. The piezoelectric sensor feeds back the pressure value to the control unit. The control unit can control the speed of the oil pump according to the pressure value. The greater the friction between the tube blank and the elbow mandrel, the higher the speed of the oil pump, and the more lubricating oil is sprayed out of the oil spray hole, thereby improving the intelligence of lubrication.

[0020] 3. The present invention is configured with an inner box, a movable plate, a connecting column, a spiral track and a connecting block. When the stamping equipment is in a shutdown state, the hydraulic pressure in the oil channel will not cause the movable plate to move, and the through hole and the oil injection hole will not overlap, thereby preventing the lubricating oil from leaking out and avoiding unnecessary waste of the lubricating oil.

[0021] 4. The present invention provides a card block, a card slot and an adaptive adjustment mechanism. It only needs to ensure that the volume of the upper cavity is larger than that of the lower cavity during installation. When the notches of the first quick-release head and the second quick-release head are initially matched, the card block can automatically adjust according to the friction between the card block and the card slot, thereby avoiding the problem of excessive friction due to assembly errors during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure is a schematic diagram of the overall structure of an intelligent pipe bending stamping and forming device of the present invention.

[0023] Figure 2 It is a schematic diagram of the cooperation between the tube blank and the mold mechanism of the present invention.

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure of the tube blank of the present invention.

[0025] Figure 4 It is a planar side view of the tube blank of the present invention.

[0026] Figure 5 It is a three-dimensional schematic diagram of the first quick-release assembly and the second quick-release assembly of the present invention.

[0027] Figure 6 It is a schematic diagram of the cooperation between the second quick-release head and the push rod of the present invention.

[0028] Figure 7 It is a planar cross-sectional view of the pressure feedback mechanism of the present invention.

[0029] Figure 8 It is a schematic diagram of the cooperation between the first quick-release assembly and the elbow mandrel of the present invention.

[0030] Fig. 9 It is a schematic plan cross-sectional view of the elbow mandrel of the present invention.

[0031] Fig.10 for Fig. 9 A magnified schematic diagram of the structure at point B in the middle.

[0032] Fig.11 It is a schematic diagram of the structure of the inner box and the spiral track of the present invention.

[0033] Fig.12 for Figure 7 A schematic diagram of the enlarged structure at point A in the middle.

[0034] The accompanying drawings are marked as follows: 1. Machine body; 11. Mold mechanism; 111. Molding flow channel; 12. Propelling mechanism; 121. Driving cylinder; 122. Push rod; 2. tube blank; 21. bulge; 3. First quick release assembly; 31. First quick release head; 32. Card slot; 4. Elbow mandrel; 41. Oil channel; 42. Connector; 5. Second quick release assembly; 51. Second quick release head; 52. Card block; 6. Gap; 7. pressure feedback mechanism; 71. pressure plate; 72. pressure detection chamber; 8. Lubricating oil spraying mechanism; 81. Oil chamber; 82. Oil inlet pipe; 83. Oil spray hole; 84. Inner box; 841. Through hole; 85. Connecting column; 851. Spiral track; 86. Moving plate; 87. Limiting rod; 871. Limiting nut; 88. Sleeve; 89. First elastic member; 9. Adaptive adjustment mechanism; 91. Mounting groove; 911. Upper cavity; 912. Lower cavity; 92. Mounting plate; 93. Adjustment plate; 94. Flow channel; 95. One-way valve member; 951. One-way cavity; 952. Sealing ball; 953. Second elastic member. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0036] Embodiment 1: In the actual production process, in order to reduce the resistance of the tube billet during the advancement process, the two sides of the tube billet are usually set as inclined surfaces, which can not only enter the die more smoothly, but also promote uniform deformation, so that the metal is more evenly distributed and flows in the initial stage of bending. However, in the process of cooperating with the push rod, the contact surface between the push rod and the tube billet is too small. When the friction between the tube billet and the die is large, the problem of the tube billet end not being formed will occur. This embodiment is specially invented to solve the above problem.

[0037] See also Figures 1 to 12 As shown, an intelligent tube bending stamping and forming device according to an embodiment of the present invention comprises a machine body 1 and a tube blank 2. A mold mechanism 11, a propulsion mechanism 12 and an elbow core rod 4 provided with a first quick-release assembly 3 are arranged on the machine body 1. The mold mechanism 11 comprises an upper mold and a lower mold fixed on the machine body 1. The upper mold and the lower mold are respectively provided with forming channels 111 that cooperate with each other. The tube blank 2 is placed in the forming channel 111 of the lower mold. The forming channel 111 is divided into a horizontal section and a forming section. The elbow core rod 4 is located in the forming section.

[0038] The propulsion mechanism 12 includes a driving cylinder 121 fixedly mounted on the machine body 1 , an output shaft of the driving cylinder 121 is fixedly connected to a push rod 122 , and a second quick-release assembly 5 is provided on a side of the push rod 122 away from the driving cylinder 121 .

[0039] Please refer to Figure 5 and Fig.10As shown, the first quick-release assembly 3 and the second quick-release assembly 5 include a first quick-release head 31 and a second quick-release head 51, one side of the first quick-release head 31 and the second quick-release head 51 are respectively fixedly connected with two symmetrically arranged positioning pins, the elbow mandrel 4 and the push rod 122 are respectively provided with positioning holes matching the positioning pins at one end close to the tube blank 2, and the first quick-release head 31 and the second quick-release head 51 are respectively provided with notches 6 that engage with each other.

[0040] Please refer to Figure 3 and Figure 4 As shown, both ends of the tube blank 2 are arranged with inclined surfaces, and one side of the tube blank 2 is provided with a protrusion 21 that cooperates with the second quick-release head 51 .

[0041] When in use, the tube blank 2 is placed in the horizontal section of the forming flow channel 111, ensuring that the inclined surface of the tube blank 2 faces the elbow core rod 4. When the upper die and the lower die are closed, the drive cylinder 121 is started to drive the push rod 122 to move in the direction of the tube blank 2. The end of the push rod 122 contacts the protrusion 21 of the tube blank 2 and drives the tube blank 2 to move toward the forming section. As the push rod 122 moves until the first quick-release head 31 and the second quick-release head 51 are fully contacted, the tube blank 2 is completely stamped into an elbow. At this time, the drive cylinder 121 drives the push rod 122 to reset, the upper die is separated from the lower die, and after the elbow core rod 4 is flipped nearly 90 degrees, the elbow is assisted in unloading by a unloading device arranged on one side of the machine body 1. The unloading device is a prior art and will not be described in detail here.

[0042] It should be noted that the first quick-release head 31 and the second quick-release head 51 are respectively fixed to the elbow core rod 4 and the push rod 122 by pins. When the first quick-release head 31 and the second quick-release head 51 are excessively worn or reach the end of their service life, workers can quickly replace the first quick-release head 31 and the second quick-release head 51 by pulling out the pins.

[0043] To sum up, the protrusion 21, the first quick-release assembly 3 and the second quick-release assembly 5 arranged on one side of the tube blank 2 not only increase the contact area between the tube blank 2 and the push rod 122, but also prevent the tube blank 2 from being deformed when the friction force is large due to the small contact surface between the tube blank 2 and the push rod 122, thereby reducing the defective rate of the tube blank 2; at the same time, the first quick-release assembly 3 and the second quick-release assembly 5 enable the matching surfaces of the elbow core rod 4 and the push rod 122 to achieve quick release and easy replacement. When both of them are severely worn or reach the end of their service life, the first quick-release head 31 and the second quick-release head 51 can be replaced by pulling out and plugging the pin shaft, which is more time-saving and labor-saving.

[0044] In the second embodiment, during the elbow forming process, it is necessary to manually spray lubricating oil to reduce friction and prevent excessive friction from causing forming defects on the inner surface of the elbow or even failure to form. However, the existing method of spraying lubricating oil is manual spraying, which is a habitual action of workers. There is no clear standard for the amount of lubricating oil and the spraying frequency, and the method of judging by human eyes lacks effectiveness. There is too little lubricating oil, which leads to poor forming and demolding difficulties of the tube blank 2, or too much lubricating oil, which leads to waste of lubricating oil. Further improvements are made on the basis of the above embodiments.

[0045] See also Figure 7 and Fig.10 As shown, a pressure feedback mechanism 7 is provided inside the second quick-release head 51, a lubricating oil spraying mechanism 8 is provided inside the first quick-release head 31, an oil channel 41 is opened inside the elbow core rod 4, a connector 42 connected to the flow channel 94 is fixedly connected to the outer wall of the elbow core rod 4, the connector 42 is connected to an external oil supply device, the oil supply device includes an oil cylinder, an oil pump and an oil pipeline, a control box is provided in the body 1, a control unit is provided in the control box, and the oil pump is electrically connected to the control unit.

[0046] The pressure feedback mechanism 7 can detect the friction between the inner wall of the tube blank 2 and the elbow mandrel 4, and send a piezoelectric signal to the oil supply device. The greater the friction, the greater the oil supply of the oil supply device.

[0047] Please refer to Figure 7 As shown, the pressure feedback mechanism 7 includes a pressure plate 71. A slot is provided on the second quick-release head 51. The pressure plate 71 slides in the slot and cooperates with the slot to form a pressure detection chamber 72. A piezoelectric sensor is arranged in the pressure detection chamber 72, and the piezoelectric sensor is connected to the control box electrical signal.

[0048] Please refer to Fig.10 As shown, the lubricating oil spraying mechanism 8 includes an oil chamber 81 located in the first quick-release head 31, an oil inlet pipe 82 connected to the oil chamber 81 is provided on one side of the first quick-release head 31, the oil inlet pipe 82 matches the oil channel 41, and a plurality of circumferentially evenly distributed oil spray holes 83 are opened on the outer wall of the second quick-release head 51.

[0049] On the basis of the above embodiment, during use, when the push rod 122 drives the second quick-release head 51 to move, the pressure plate 71 comes into contact with the protrusion 21 of the tube blank 2, and the piezoelectric sensor will feed back the pressure signal in the pressure detection chamber 72 to the control box. The control box controls the speed of the oil pump according to the pressure value. The oil pump is started to pump the lubricating oil in the cylinder into the oil chamber 81, and is sprayed between the tube blank 2 and the elbow core rod 4 through the oil injection hole 83, thereby reducing the friction between the tube blank 2 and the elbow core rod 4.

[0050] In summary, by providing the pressure feedback mechanism 7 and the lubricating oil spraying mechanism 8, spraying lubricating oil is no longer a habitual action of the workers. The friction between the tube blank 2 and the elbow mandrel 4 is converted into a pressure value change in the pressure detection chamber 72 and transmitted to the piezoelectric sensor. The piezoelectric sensor feeds back the pressure value to the control unit. The control unit can control the speed of the oil pump according to the pressure value. The greater the friction between the tube blank 2 and the elbow mandrel 4, the higher the speed of the oil pump, and the more lubricating oil is sprayed out of the oil injection hole 83.

[0051] Embodiment 3: In order to prevent the lubricating oil in the oil chamber 81 from leaking out from the oil injection hole 83 under the action of gravity, so as to avoid the waste of lubricating oil when the punching machine is in a stopped state, further improvements are made on the basis of the above embodiment.

[0052] Please refer to Fig.10 and Fig.11 As shown, an inner box 84 is rotatably connected in the oil chamber 81, and a plurality of through holes 841 matching the oil injection holes 83 are provided on the side wall of the inner box 84. In the initial state, the through holes 841 and the oil injection holes 83 are staggered, and a connecting column 85 is coaxially fixed on the inner box 84. A movable plate 86 sealingly matched with the oil inlet pipe 82 is provided in the oil chamber 81, and a plurality of limit rods 87 matching with the movable plate 86 are fixed on the inner wall of the oil chamber 81. A sleeve 88 is coaxially fixed on the side of the movable plate 86 away from the oil inlet pipe 82, and the sleeve 88 is coaxially arranged with the connecting column 85. A spiral track 851 is provided on the circumferential side of the connecting column 85, and a connecting block meshing with the spiral track 851 is provided on the inner wall of the sleeve 88.

[0053] When the movable plate 86 is pushed by the lubricating oil and moves toward the inner box 84 , the inner box 84 rotates under the action of the connecting block and the spiral track 851 .

[0054] The movable plate 86 is provided with a plurality of limiting holes matching the limiting rods 87 . One end of the plurality of limiting rods 87 away from the movable plate 86 is threadedly connected to the limiting nut 871 . A first elastic member 89 is provided between the limiting nut 871 and the movable plate 86 .

[0055] During use, after the lubricating oil is pumped to the oil channel 41, the lubricating oil pressure in the oil channel 41 gradually increases, and eventually the movable plate 86 overcomes the elastic force of the first elastic member 89 and moves, and the lubricating oil smoothly enters the oil chamber 81. Under the action of the spiral track 851 and the connecting block, the inner box 84 rotates with the movement of the movable plate 86 until the through hole 841 matches the oil injection hole 83. At this time, the lubricating oil passes through the through hole 841 and the oil injection hole 83 in turn and enters between the tube blank 2 and the elbow core rod 4.

[0056] It should be noted that although the through holes 841 and the fuel injection holes 83 are staggered in the initial state, as long as the inner box 84 rotates at any angle, the through holes 841 will form a channel with the fuel injection holes 83. As the inner box 84 continues to rotate, the through holes 841 and the fuel injection holes 83 overlap to a greater extent.

[0057] In summary, through the settings of the inner box 84, the movable plate 86, the connecting column 85, the spiral track 851 and the connecting block, when the stamping equipment is in a shutdown state, the hydraulic pressure in the oil channel 41 will not cause the movable plate 86 to move, and the through hole 841 and the oil injection hole 83 will not overlap, preventing the lubricating oil from leaking out and avoiding unnecessary waste of the lubricating oil.

[0058] Embodiment 4: In order to facilitate accurate alignment of the push rod 122 and the elbow mold and prevent the push rod 122 and the elbow mold from sliding relative to each other under high pressure, a notch 6 that matches each other will be opened on the push rod 122 and the elbow mold respectively, and the two notches 6 can bite each other. However, it is found in actual production that due to the assembly error of the elbow mold and the push rod 122, there is often a certain deviation between the axes of the two. When the two are matched, the contact surface of the notch 6 will produce very large friction, causing the contact surface of the notch 6 to wear very much. When the wear reaches a certain level, the positioning effect of the notch 6 will be weakened, and it is very time-consuming and laborious to replace the push rod 122 or the elbow mold. In view of the above problems, further improvements are made on the basis of the above embodiments.

[0059] Please refer to Figure 6 , Figure 8 and Fig.12 As shown, a slot 32 is provided at the notch 6 of the first quick-release head 31, the pressure plate 71 is an annular structure and a block 52 matching the slot 32 is provided on one side, and an adaptive adjustment mechanism 9 is provided between the block 52 and the pressure plate 71. When the block 52 is engaged with the slot 32, if the friction between the block 52 and the slot 32 is too large due to assembly error, the adaptive adjustment mechanism 9 can adjust the position of the block 52 according to the size of the friction.

[0060] Please refer to Fig.12 As shown, the adaptive adjustment mechanism 9 includes a mounting groove 91 opened on the pressure plate 71, and the end of the block 52 close to the mounting groove 91 is fixedly connected to the mounting plate 92, and the end of the mounting plate 92 located in the mounting groove 91 is fixedly connected to the adjustment plate 93, and the adjustment plate 93 divides the mounting groove 91 into an upper cavity 911 and a lower cavity 912, and the upper cavity 911 and the lower cavity 912 are both filled with hydraulic oil.

[0061] A flow channel 94 is opened on one side of the regulating groove, and a one-way valve member 95 is arranged in the flow channel 94 . The hydraulic oil in the upper chamber 911 can enter the lower chamber 912 through the one-way valve member 95 .

[0062] refer to Fig.12 As shown, the one-way valve member 95 includes a one-way cavity 951 , a sealing ball 952 is disposed on one side of the one-way cavity 951 close to the upper cavity 911 , and a second elastic member 953 is disposed between the sealing ball 952 and the one-way cavity 951 .

[0063] During use, workers install the block 52 in the installation groove 91, and after installation, they need to ensure that the friction between the block 52 and the groove 32 is greater than the normal value, that is, in the initial state, the volume of the upper chamber 911 is larger than the lower chamber 912. After the installation is completed, the push rod 122 drives the second quick-release head 51 to engage with the notch 6 on the first quick-release head 31 on the elbow core rod 4. During the initial engagement process, the block 52 and the groove 32 will generate friction beyond the normal range. At this time, the block 52 will be subjected to an upward force, and the block 52 drives the adjustment plate 93 to move upward. After the hydraulic pressure in the upper chamber 911 exceeds a certain range, the sealing ball 952 will break through the restriction of the second elastic member 953 under the action of the hydraulic pressure, and part of the hydraulic oil will enter the lower chamber 912, and the adjustment plate 93 drives the block 52 to move upward.

[0064] In summary, through the arrangement of the block 52, the slot 32 and the adaptive adjustment mechanism 9, it is only necessary to ensure that the volume of the upper cavity 911 is larger than the lower cavity 912 during installation. When the notch 6 of the first quick-release head 31 and the second quick-release head 51 are initially matched, the block 52 can automatically adjust according to the friction between the block 52 and the slot 32, thereby avoiding the problem of excessive friction due to assembly errors during use.

[0065] Embodiment 5, a method for stamping and forming an intelligent pipe bend, comprising the following steps: Step 1: Install the first quick-release head 31 and the second quick-release head 51 on the ends of the elbow core rod 4 and the push rod 122 respectively, and ensure that the notches 6 of the two can engage with each other.

[0066] Step 2: Install the block 52 in the installation groove 91 , and in the initial state, make the volume of the upper cavity 911 larger than the volume of the lower cavity 912 .

[0067] Step 3: Start the drive cylinder 121, and the push rod 122 drives the first quick-release head 31 to approach and engage with the second quick-release head 51, so that the clamping block 52 is adaptively adjusted according to the magnitude of the friction force during the engagement process, and then the drive cylinder 121 is reset.

[0068] Step 4: Place the tube blank 2 in the molding flow channel 111 , with the end with the protrusion 21 facing the first quick-release head 31 .

[0069] Step 5: After the upper die and the lower die are engaged, the driving cylinder 121 is started, and the tube blank 2 is sleeved on the elbow mandrel 4 under the punching of the push rod 122 and the first quick-release head 31 and gradually formed into an elbow.

[0070] Step 6: The upper die is separated from the lower die, and the elbow core rod 4 is turned to one side, and the material is unloaded mechanically or manually.

[0071] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An intelligent tube bending stamping and forming device, comprising a machine body (1) and a tube blank (2), characterized in that: The machine body (1) is provided with a mold mechanism (11), a propulsion mechanism (12), and an elbow mandrel (4) provided with a first quick-release assembly (3); the mold mechanism (11) comprises an upper mold and a lower mold fixed to the machine body (1); the upper mold and the lower mold are respectively provided with mutually matching molding flow channels (111); the tube blank (2) is placed in the molding flow channel (111) of the lower mold; The propulsion mechanism (12) comprises a driving cylinder (121) fixedly mounted on the machine body (1), the output shaft of the driving cylinder (121) being fixedly connected to a push rod (122), and a second quick-release assembly (5) being provided on a side of the push rod (122) away from the driving cylinder (121); The first quick-release assembly (3) and the second quick-release assembly (5) comprise a first quick-release head (31) and a second quick-release head (51); the first quick-release head (31) and the second quick-release head (51) are respectively provided with notches (6) that engage with each other; Both ends of the tube blank (2) are arranged with inclined surfaces, and one side of the tube blank (2) is provided with a protrusion (21) that cooperates with the second quick-release head (51).

2. The intelligent tube bending stamping and forming equipment according to claim 1, characterized in that: A pressure feedback mechanism (7) is provided inside the second quick-release head (51), a lubricating oil spraying mechanism (8) is provided inside the first quick-release head (31), an oil passage (41) is provided inside the elbow mandrel (4), a connector (42) in communication with the flow passage (94) is fixedly connected to the outer wall of the elbow mandrel (4), and the connector (42) is externally connected to an oil supply device; The pressure feedback mechanism (7) can detect the magnitude of the friction between the inner wall of the tube blank (2) and the elbow core rod (4), and send a piezoelectric signal to the oil supply device. The greater the friction, the greater the oil supply of the oil supply device.

3. The intelligent tube bending stamping and forming equipment according to claim 2 is characterized in that: The pressure feedback mechanism (7) comprises a pressure plate (71), a slot is provided on the second quick-release head (51), the pressure plate (71) slides in the slot and cooperates with the slot to form a pressure detection chamber (72), a piezoelectric sensor is arranged in the pressure detection chamber (72), and the piezoelectric sensor is connected to the oil supply device by electrical signals.

4. The intelligent tube bending stamping and forming equipment according to claim 3 is characterized in that: The lubricating oil spraying mechanism (8) comprises an oil chamber (81) located in the first quick-release head (31); an oil inlet pipe (82) communicating with the oil chamber (81) is provided on one side of the first quick-release head (31); the oil inlet pipe (82) matches the oil passage (41); and a plurality of oil spraying holes (83) evenly distributed around the circumference are provided on the outer wall of the second quick-release head (51).

5. The intelligent tube bending stamping and forming equipment according to claim 4, characterized in that: An inner box (84) is rotatably connected in the oil chamber (81), a plurality of through holes (841) matching the oil injection holes (83) are provided on the side wall of the inner box (84), and in an initial state, the through holes (841) and the oil injection holes (83) are arranged alternately, a connecting column (85) is coaxially fixed on the inner box (84), a movable plate (86) sealingly matched with the oil inlet pipe (82) is provided in the oil chamber (81), a plurality of limit rods (87) matching with the movable plate (86) are fixed on the inner wall of the oil chamber (81), a sleeve (88) is coaxially fixed on the side of the movable plate (86) away from the oil inlet pipe (82), the sleeve (88) is coaxially arranged with the connecting column (85), a spiral track (851) is provided on the circumferential side of the connecting column (85), and a connecting block meshing with the spiral track (851) is provided on the inner wall of the sleeve (88); When the movable plate (86) is pushed by the lubricating oil and moves in a direction close to the inner box (84), the inner box (84) rotates under the action of the connecting block and the spiral track (851).

6. The intelligent tube bending stamping and forming equipment according to claim 5, characterized in that: The movable plate (86) is provided with a plurality of limiting holes matching the limiting rods (87); one end of the plurality of limiting rods (87) away from the movable plate (86) is threadedly connected to a limiting nut (871); and a first elastic member (89) is provided between the limiting nut (871) and the movable plate (86).

7. The intelligent tube bending stamping and forming equipment according to claim 6, characterized in that: A slot (32) is provided at the notch (6) of the first quick-release head (31); the pressure plate (71) is an annular structure and has a block (52) matching the slot (32) disposed on one side; an adaptive adjustment mechanism (9) is disposed between the block (52) and the pressure plate (71); when the block (52) is engaged with the slot (32), if the friction force of the block (52) and the slot (32) is too large due to an assembly error, the adaptive adjustment mechanism (9) can adjust the position of the block (52) according to the magnitude of the friction force.

8. The intelligent tube bending stamping and forming equipment according to claim 7, characterized in that: The adaptive adjustment mechanism (9) comprises a mounting groove (91) formed on the pressure plate (71); one end of the clamping block (52) close to the mounting groove (91) is fixedly connected to the mounting plate (92); one end of the mounting plate (92) located in the mounting groove (91) is fixedly connected to an adjustment plate (93); the adjustment plate (93) is sealingly and slidably connected to the mounting groove (91); the adjustment plate (93) divides the mounting groove (91) into an upper cavity (911) and a lower cavity (912); and the upper cavity (911) and the lower cavity (912) are both filled with hydraulic oil; A flow channel (94) is provided on one side of the regulating groove, and a one-way valve component (95) is provided in the flow channel (94), so that the hydraulic oil in the upper chamber (911) can enter the lower chamber (912) through the one-way valve component (95).

9. The intelligent tube bending stamping and forming equipment according to claim 8, characterized in that: The one-way valve member (95) comprises a one-way chamber (951), a sealing ball (952) is provided on a side of the one-way chamber (951) close to the upper chamber (911), and a second elastic member (953) is provided between the sealing ball (952) and the one-way chamber (951).

10. A method for stamping and forming an intelligent pipe bend, using the intelligent pipe bend stamping and forming equipment according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Install the first quick-release head (31) and the second quick-release head (51) on the ends of the elbow core rod (4) and the push rod (122) respectively, and ensure that the notches (6) of the two can engage with each other; Step 2: Install the card block (52) in the installation groove (91), so that in the initial state, the volume of the upper chamber (911) is greater than the volume of the lower chamber (912); Step 3: starting the drive cylinder (121), the push rod (122) drives the first quick-release head (31) to approach and engage with the second quick-release head (51), so that the clamping block (52) is adaptively adjusted according to the magnitude of the friction force during the engagement process, and then the drive cylinder (121) is reset; Step 4: placing the tube blank (2) in the molding flow channel (111) with the end with the protrusion (21) facing the first quick-release head (31); Step 5: After the upper die and the lower die are engaged, the driving cylinder (121) is started, and the tube blank (2) is sleeved on the elbow mandrel (4) under the punching of the push rod (122) and the first quick-release head (31) and gradually formed into an elbow; Step 6: The upper die is separated from the lower die, and the elbow mandrel (4) is turned to one side for mechanically assisted or manual unloading.

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