An intelligent pipe bending and stamping forming device and method

Abstract

The present invention discloses an intelligent pipe bending and stamping forming device and method, which relates to the technical field of pipe fitting stamping forming. The device includes a machine body and a pipe blank. A die mechanism, a propulsion mechanism and an elbow mandrel provided with a first quick-release component are arranged on the machine body. The die mechanism includes an upper die and a lower die fixed on the machine body. The upper die and the lower die are respectively provided with mutually matching forming runners, and the pipe blank is placed in the forming runner of the lower die. By setting a pressure feedback mechanism and a lubricating oil spraying mechanism, the friction force between the pipe 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, and the control unit can control the rotation speed of the oil pump according to the magnitude of the pressure value. The greater the friction force between the pipe blank and the elbow mandrel, the higher the rotation speed of the oil pump, and the more lubricating oil sprayed out of the oil injection holes, improving the intelligent degree of lubrication and ensuring the stamping effect.

Description

Technical Field

[0001] The present invention relates to the technical field of tube fitting stamping and forming, and particularly to an intelligent pipe bending stamping and forming device and method. Background Art

[0002] The cold push elbow machine mainly utilizes the plasticity of metal at normal temperature, and through mechanical force, it pushes the tube blank to bend and deform within the mold, thereby forming an elbow. Taking the die-type cold push pipe bending as an example, on an ordinary hydraulic press or a crank press, the tube blank is pressed into a die with a bent cavity, and the tube blank is bent into an elbow according to the shape of the mold.

[0003] During the cold push pipe bending forming process, the push rod pushes the tube blank to move towards one side of the elbow mold. There is a large frictional force between the inner wall of the tube blank and the elbow mold. During the forming process, it is necessary to manually spray lubricating oil to reduce friction and prevent the inner surface of the elbow from having forming defects or even being unable to form due to excessive frictional force. 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. The method of judging by the human eye lacks effectiveness. There is a situation where too little lubricating oil leads to poor forming of the tube blank and difficult demolding, or too much lubricating oil causes waste of lubricating oil.

[0004] Chinese Patent with application number 201710603323.3 discloses an elbow cold push processing method and the die core mechanism used in this method. The elbow mold is set as a multi-section type, enabling it to produce variable diameters. When discharging, the diameter decreases, facilitating its demolding. However, although this invention improves the problem of difficult demolding between the elbow and the mold, it does not solve the problem of excessive frictional force between the inner wall of the elbow and the mold during the elbow forming process. Moreover, with the frequent variable diameters of the elbow, wear is bound to occur 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 does not meet the standard.

[0005] Meanwhile, in order to reduce the resistance during the advancement of the tube blank, the two sides of the tube blank are usually set as inclined surfaces, which can not only enter the mold more smoothly but also promote uniform deformation, enabling the metal to be more evenly distributed and flow at the initial stage of bending. However, during the cooperation with the push rod, the contact surface between the push rod and the tube blank is too small. When the frictional force between the tube blank and the mold is large, there will be a problem that the end of the tube blank is not formed.

[0006] Therefore, the present invention proposes an intelligent pipe bending stamping and forming device and method to solve the above problems. Summary of the Invention

[0007] The object of the present invention is to provide an intelligent pipe bending and stamping forming device and method to solve the technical problems of lack of stability in manual lubricating oil spraying and excessive friction caused by assembly errors when the clamping block and the clamping groove form positioning in the above-mentioned background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions: An intelligent pipe bending and stamping forming device includes a machine body and a pipe blank. A die mechanism, a propulsion mechanism, and an elbow mandrel provided with a first quick-release component are arranged on the machine body. The die mechanism includes an upper die and a lower die fixed on the machine body. Mutually matching forming channels are respectively opened on the upper die and the lower die, and the pipe blank is placed in the forming channel of the lower die.

[0009] The propulsion mechanism includes a driving cylinder fixedly installed on the machine body. The output shaft of the driving cylinder is fixedly connected with a push rod, and a second quick-release component is arranged on the side of the push rod away from the driving cylinder.

[0010] The first quick-release component and the second quick-release component 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. Positioning holes matching the positioning pins are respectively opened at the ends of the elbow mandrel and the push rod close to the pipe blank. Notches that engage with each other are respectively arranged on the first quick-release head and the second quick-release head.

[0011] Both ends of the pipe blank are provided with inclined surfaces, and a protrusion cooperating with the second quick-release head is arranged on one side of the pipe blank.

[0012] Preferably, a pressure feedback mechanism is arranged inside the second quick-release head, a lubricating oil spraying mechanism is arranged inside the first quick-release head, an oil passage is opened in the elbow mandrel, a connection head communicating with the flow channel is fixedly connected to the outer wall of the elbow mandrel, and the connection head is externally connected to an oil supply device.

[0013] The pressure feedback mechanism can detect the friction force between the inner wall of the pipe blank and the elbow mandrel and send a piezoelectric signal to the oil supply device. The greater the friction force, the greater the oil supply of the oil supply device.

[0014] Preferably, the pressure feedback mechanism includes a pressure plate. A slot is opened 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 electrically connected to the oil supply device.

[0015] Preferably, the lubricating oil spraying mechanism includes an oil cavity located inside the first quick-release head. An oil inlet pipe communicating with the oil cavity is arranged on one side of the first quick-release head. The oil inlet pipe matches the oil passage, and a plurality of spray holes evenly distributed in a circle are opened on the outer wall of the second quick-release head.

[0016] Preferably, an inner box is rotatably connected in the oil cavity. A plurality of through holes matching the oil injection holes are formed in the side wall of the inner box. In the initial state, the through holes and the oil injection holes are arranged staggeredly. A connecting column is coaxially fixed on the inner box. A moving plate in sealing cooperation with the oil inlet pipe is arranged in the oil cavity. A plurality of limiting rods cooperating with the moving plate are fixed on the inner wall of the oil cavity. A sleeve is coaxially fixed on the side of the moving plate away from the oil inlet pipe. The sleeve is coaxially arranged with the connecting column. A spiral track is formed on the circumferential side of the connecting column. A connecting block meshing with the spiral track is arranged on the inner wall of the sleeve;

[0017] When the moving plate is pushed by the lubricating oil to move towards the inner box, the inner box rotates under the action of the connecting block and the spiral track.

[0018] Preferably, a plurality of limiting holes matching the limiting rods are formed in the moving plate. A limiting nut is screwed on one end of each of the plurality of limiting rods away from the moving plate. A first elastic member is arranged between the limiting nut and the moving plate.

[0019] Preferably, a clamping groove is formed at the notch of the first quick-release head. The pressure plate is of an annular structure and a clamping block matching the clamping groove is arranged on one side. An adaptive adjustment mechanism is arranged between the clamping block and the pressure plate. When the clamping block engages with the clamping groove, if the friction force caused by the assembly error of the clamping block and the clamping groove is too large, the adaptive adjustment mechanism can adjust the position of the clamping block according to the size of the friction force.

[0020] Preferably, the adaptive adjustment mechanism includes an installation groove formed in the pressure plate. One end of the clamping block close to the installation groove is fixedly connected with an installation plate. One end of the installation plate located in the installation groove is fixedly connected with an adjustment plate. The adjustment plate is in sealed sliding connection with the installation groove. The adjustment plate divides the installation groove into an upper cavity and a lower cavity. The upper cavity and the lower cavity are both filled with hydraulic oil;

[0021] A flow channel is formed on one side of the adjustment groove. A one-way valve member is arranged in the flow channel. The hydraulic oil in the upper cavity can enter the lower cavity through the one-way valve member.

[0022] Preferably, the one-way valve member includes a one-way cavity. A sealing ball is arranged on one side of the one-way cavity close to the upper cavity. A second elastic member is arranged between the sealing ball and the one-way cavity.

[0023] A method for intelligent bending pipe stamping and forming includes the following steps:

[0024] Step 1: Install the first quick-release head and the second quick-release head at the ends of the elbow mandrel and the push rod respectively, and ensure that the notches of the two can engage with each other;

[0025] Step 2: Install the clamping block in the installation groove. In the initial state, make the volume of the upper cavity larger than that of the lower cavity;

[0026] Step 3: Start the driving cylinder. The push rod drives the first quick-release head to approach and engage with the second quick-release head. During the engagement, the clamping block is adaptively adjusted according to the magnitude of the frictional force, and then the driving cylinder resets.

[0027] Step 4: Place the tube blank in the forming runner, with the end having the protrusion facing the first quick-release head.

[0028] Step 5: After the upper die and the lower die are engaged, start the driving cylinder. The tube blank is pressed by the push rod and the first quick-release head and sleeved on the elbow mandrel and gradually formed into an elbow.

[0029] Step 6: Separate the upper die and the lower die. The elbow mandrel flips to one side, and the blank is discharged by mechanical assistance or manually.

[0030] The beneficial effects of the present invention are as follows:

[0031] 1. Through the settings such as the protrusion provided on one side of the tube blank, the first quick-release assembly and the second quick-release assembly, the present invention not only increases the contact area between the tube blank and the push rod, prevents the tube blank from deforming due to excessive friction when the contact surface between the tube blank and the push rod is too small, and reduces the defective rate of the tube blank; at the same time, the first quick-release assembly and the second quick-release assembly enable the mating surfaces of the elbow mandrel and the push rod to achieve quick disassembly and easy replacement. When there is significant wear or the service life is reached, the first quick-release head and the second quick-release head can be replaced by pulling and inserting the pin shaft, which is more time-saving and labor-saving.

[0032] 2. By providing a pressure feedback mechanism and a lubricating oil spraying mechanism, the present invention converts the frictional force between the tube blank and the elbow mandrel into a change in the pressure value in the pressure detection chamber and transmits it to the piezoelectric sensor. The piezoelectric sensor feeds back the pressure value to the control unit, and the control unit can control the rotation speed of the oil pump according to the magnitude of the pressure value. The greater the frictional force between the tube blank and the elbow mandrel, the higher the rotation speed of the oil pump, and the more lubricating oil is sprayed out of the oil injection holes, improving the intelligent level of lubrication.

[0033] 3. Through the settings such as the inner box, the moving plate, the connecting column, the spiral track and the connecting block, when the stamping equipment is in a shutdown state, the hydraulic pressure in the oil passage does not cause the moving plate to move, and the through hole and the oil injection hole do not coincide, preventing the lubricating oil from leaking out and avoiding unnecessary waste of the lubricating oil.

[0034] 4. Through the settings of the clamping block, the clamping groove and the adaptive adjustment mechanism, it only needs to ensure that the volume of the upper cavity is greater 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 engaged, the clamping block can be automatically adjusted according to the frictional force between the clamping block and the clamping groove, avoiding the problem of excessive frictional force caused by assembly errors during use. Description of the Drawings

[0035] Figure 1 This is the overall structural schematic diagram of an intelligent pipe bending and stamping forming device of the present invention.

[0036] Figure 2 This is the schematic diagram of the cooperation between the pipe blank and the die mechanism of the present invention.

[0037] Figure 3 This is the three-dimensional structural schematic diagram of the pipe blank of the present invention.

[0038] Figure 4 This is the plane side view of the pipe blank of the present invention.

[0039] Figure 5 This is the three-dimensional schematic diagram of the first quick-release component and the second quick-release component of the present invention.

[0040] Figure 6 This is the schematic diagram of the cooperation between the second quick-release head and the push rod of the present invention.

[0041] Figure 7 This is the plane cross-sectional view of the pressure feedback mechanism of the present invention.

[0042] Figure 8 This is the schematic diagram of the cooperation between the first quick-release component and the elbow mandrel of the present invention.

[0043] Figure 9 This is the plane cross-sectional schematic diagram of the elbow mandrel of the present invention.

[0044] Figure 10 It is Figure 9 The enlarged structural schematic diagram at position B in

[0045] Figure 11 This is the structural schematic diagram of the inner box and the spiral track of the present invention.

[0046] Figure 12 It is Figure 7 The enlarged structural schematic diagram at position A in

[0047] The reference numerals are:

[0048] 1. Machine body; 11. Die mechanism; 111. Forming runner; 12. Propelling mechanism; 121. Driving cylinder; 122. Push rod;

[0049] 2. Pipe blank; 21. Protrusion;

[0050] 3. First quick-release component; 31. First quick-release head; 32. Card slot;

[0051] 4. Elbow mandrel; 41. Oil channel; 42. Connector;

[0052] 5. Second quick-release component; 51. Second quick-release head; 52. Locking block;

[0053] 6. Notch;

[0054] 7. Pressure feedback mechanism; 71. Pressure plate; 72. Pressure detection chamber;

[0055] 8. Lubricating oil spraying mechanism; 81. Oil chamber; 82. Oil inlet pipe; 83. Oil injection 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;

[0056] 9. Adaptive adjustment mechanism; 91. Installation groove; 911. Upper chamber; 912. Lower chamber; 92. Installation plate; 93. Adjusting plate; 94. Flow channel; 95. Check valve member; 951. Check chamber; 952. Sealing ball; 953. Second elastic member. Detailed implementation manners

[0057] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present invention.

[0058] Embodiment 1. In the actual production process, in order to reduce the resistance of the tube blank during the advancement process, the two sides of the tube blank are usually set as inclined surfaces, which can not only enter the mold more smoothly, but also promote uniform deformation, so that the metal is more evenly distributed and flows at the initial stage of bending. However, during the cooperation with the push rod, the contact surface between the push rod and the tube blank is too small. When the friction between the tube blank and the mold is large, the problem of non-forming at the end of the tube blank will occur. To solve the above problems, this embodiment is specifically invented.

[0059] Please refer to Figures 1 to 12 As shown in the figure, an intelligent pipe bending and stamping forming device according to an embodiment of the present invention includes a machine body 1 and a tube blank 2. A mold mechanism 11, a propulsion mechanism 12, and an elbow mandrel 4 provided with a first quick-release assembly 3 are arranged on the machine body 1. The mold mechanism 11 includes an upper mold and a lower mold fixed on the machine body 1. Mutually cooperating forming channels 111 are respectively opened on the upper mold and the lower mold. 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, and the elbow mandrel 4 is located in the forming section.

[0060] The propulsion mechanism 12 includes a driving cylinder 121 fixedly installed on the machine body 1. The output shaft of the driving cylinder 121 is fixedly connected with a push rod 122, and a second quick-release assembly 5 is arranged on the side of the push rod 122 away from the driving cylinder 121.

[0061] Please refer to Figure 5and Figure 10 As shown, the first quick-release component 3 and the second quick-release component 5 include a first quick-release head 31 and a second quick-release head 51. On one side of the first quick-release head 31 and the second quick-release head 51, two symmetrically arranged positioning pins are fixedly connected respectively. Positioning holes matching the positioning pins are respectively formed at one ends of the elbow mandrel 4 and the push rod 122 close to the tube blank 2. Notches 6 that engage with each other are respectively arranged on the first quick-release head 31 and the second quick-release head 51.

[0062] Please refer to Figure 3 and Figure 4 As shown, both ends of the tube blank 2 are beveled, and a protrusion 21 that cooperates with the second quick-release head 51 is arranged on one side of the tube blank 2.

[0063] During use, place the tube blank 2 on the horizontal section of the forming runner 111, ensuring that the bevel of the tube blank 2 faces the elbow mandrel 4. After the upper die and the lower die are closed, the driving cylinder 121 is activated to drive the push rod 122 to move towards 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 towards the forming section. As the push rod 122 moves until the first quick-release head 31 and the second quick-release head 51 are in full contact, the tube blank 2 is completely stamped into an elbow. At this time, the driving cylinder 121 drives the push rod 122 to reset, and the upper die and the lower die are separated. After the elbow mandrel 4 is flipped nearly 90 degrees, the blanking device arranged on one side of the machine body 1 assists in blanking the elbow. The blanking device is a prior art and will not be elaborated here.

[0064] It should be noted that the first quick-release head 31 and the second quick-release head 51 are respectively fixed to the elbow mandrel 4 and the push rod 122 through pin shafts. When the first quick-release head 31 and the second quick-release head 51 are excessively worn or reach the service life, workers can quickly replace the first quick-release head 31 and the second quick-release head 51 by pulling out the pin shafts.

[0065] In summary, through the settings such as the protrusion 21 arranged on one side of the tube blank 2, the first quick-release component 3 and the second quick-release component 5, etc., not only the contact area between the tube blank 2 and the push rod 122 is increased, preventing the tube blank 2 from deforming due to too small a contact surface and large frictional force between the tube blank 2 and the push rod 122, reducing the defective rate of the tube blank 2; at the same time, the first quick-release component 3 and the second quick-release component 5 enable the mating surfaces of the elbow mandrel 4 and the push rod 122 to achieve quick release and easy replacement. When the two have significant wear or reach the service life, the first quick-release head 31 and the second quick-release head 51 can be replaced by pulling out and inserting the pin shafts, which is more time-saving and labor-saving.

[0066] Embodiment 2. During the forming process of the elbow, it is necessary to manually spray lubricating oil to reduce friction and prevent forming defects or even failure to form on the inner surface of the elbow due to excessive frictional force. 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 may be insufficient lubricating oil, resulting in poor forming of the tube blank 2 and difficult demolding, or excessive lubricating oil, leading to waste of lubricating oil. Further improvements are made based on the above embodiments.

[0067] Please refer to Figure 7 and Figure 10 As shown, a pressure feedback mechanism 7 is arranged inside the second quick-release head 51, a lubricating oil spraying mechanism 8 is arranged inside the first quick-release head 31, an oil passage 41 is opened inside the elbow mandrel 4, a connector 42 communicating with the flow passage 94 is fixedly connected to the outer wall of the elbow mandrel 4, the connector 42 is externally connected to an oil supply device, the oil supply device includes an oil cylinder, an oil pump and an oil pipeline, a control box is arranged inside the machine body 1, and a control unit is arranged inside the control box. The oil pump is electrically connected to the control unit.

[0068] The pressure feedback mechanism 7 can detect the frictional force 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 frictional force, the greater the oil supply of the oil supply device.

[0069] Please refer to Figure 7 As shown, the pressure feedback mechanism 7 includes a pressure plate 71. A slot is opened 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 inside the pressure detection chamber 72, and the piezoelectric sensor is electrically connected to the control box.

[0070] Please refer to Figure 10 As shown, the lubricating oil spraying mechanism 8 includes an oil chamber 81 located inside the first quick-release head 31. An oil inlet pipe 82 communicating with the oil chamber 81 is arranged on one side of the first quick-release head 31. The oil inlet pipe 82 is matched with the oil passage 41. A plurality of spray holes 83 are circumferentially and evenly arranged on the outer wall of the second quick-release head 51.

[0071] Based on the above embodiments, during use, when the push rod 122 drives the second quick-release head 51 to move, the pressure plate 71 contacts the protrusion 21 of the tube blank 2, and the piezoelectric sensor will feedback the pressure signal in the pressure detection chamber 72 to the control box. The control box controls the rotation speed of the oil pump according to the magnitude of the pressure value. The oil pump starts to pump the lubricating oil in the oil cylinder into the oil chamber 81, and sprays it between the tube blank 2 and the elbow mandrel 4 through the spray holes 83, thereby reducing the frictional force between the tube blank 2 and the elbow mandrel 4.

[0072] In summary, by setting up the pressure feedback mechanism 7 and the lubricating oil spraying mechanism 8, the spraying of lubricating oil is no longer a habitual action of workers. The frictional force between the tube blank 2 and the elbow mandrel 4 is converted into a change in the pressure value in the pressure detection chamber 72 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 rotation speed of the oil pump according to the magnitude of the pressure value. The greater the frictional force between the tube blank 2 and the elbow mandrel 4, the higher the rotation speed of the oil pump, and the more lubricating oil is sprayed out from the oil injection holes 83.

[0073] Embodiment 3: In order to prevent the lubricating oil in the oil cavity 81 from seeping out of the oil injection holes 83 under the action of gravity, resulting in waste of lubricating oil when the stamping machine is in a stopped state. Further improvements are made on the basis of the above embodiments.

[0074] Please refer to Figure 10 and Figure 11 As shown, an inner box 84 is rotatably connected in the oil cavity 81. A plurality of through holes 841 matching the oil injection holes 83 are formed in the side wall of the inner box 84. In the initial state, the through holes 841 and the oil injection holes 83 are staggered. A connecting column 85 is coaxially fixed on the inner box 84. A moving plate 86 in sealing cooperation with the oil inlet pipe 82 is arranged in the oil cavity 81. A plurality of limiting rods 87 cooperating with the moving plate 86 are fixed on the inner wall of the oil cavity 81. A sleeve 88 is coaxially fixed on the side of the moving plate 86 away from the oil inlet pipe 82. The sleeve 88 and the connecting column 85 are coaxially arranged. A spiral track 851 is formed on the circumferential side of the connecting column 85, and a connecting block meshing with the spiral track 851 is arranged on the inner wall of the sleeve 88.

[0075] When the moving plate 86 moves towards the inner box 84 under the push of the lubricating oil, the inner box 84 rotates under the action of the connecting block and the spiral track 851.

[0076] A plurality of limiting holes matching the limiting rods 87 are formed in the moving plate 86. A limiting nut 871 is threadedly connected to one end of each of the plurality of limiting rods 87 away from the moving plate 86. A first elastic member 89 is arranged between the limiting nut 871 and the moving plate 86.

[0077] During use, when the lubricating oil is pumped into the oil passage 41, the pressure of the lubricating oil in the oil passage 41 gradually increases, and finally causes the moving plate 86 to move after overcoming the elastic force of the first elastic member 89. The lubricating oil smoothly enters the oil cavity 81. Under the action of the spiral track 851 and the connecting block, the inner box 84 rotates as the moving plate 86 moves until the through holes 841 and the oil injection holes 83 are matched. At this time, the lubricating oil sequentially passes through the through holes 841 and the oil injection holes 83 and enters between the tube blank 2 and the elbow mandrel 4.

[0078] It should be noted that although the through hole 841 and the oil injection hole 83 are staggeredly arranged in the initial state, as long as the inner box 84 rotates at any angle, a channel will be formed between the through hole 841 and the oil injection hole 83. As the inner box 84 continues to rotate, the coincidence degree between the through hole 841 and the oil injection hole 83 becomes greater.

[0079] In summary, through the settings of the inner box 84, the moving plate 86, the connecting column 85, the spiral track 851, the connecting block, etc., when the stamping equipment is in a shutdown state, the hydraulic pressure in the oil passage 41 will not cause the moving plate 86 to move, and the through hole 841 and the oil injection hole 83 will not coincide, preventing the lubricating oil from leaking out and avoiding unnecessary waste of the lubricating oil.

[0080] In Embodiment 4, in order to facilitate the accurate alignment of the push rod 122 and the elbow die and prevent relative sliding between the push rod 122 and the elbow die under high pressure, a pair of mutually cooperating notches 6 are respectively formed in the push rod 122 and the elbow die, and the two notches 6 can be engaged with each other. However, it is found in actual production that due to the assembly error between the elbow die and the push rod 122, there is often a certain deviation between their axes. When they are engaged, a very large friction will be generated on the contact surface of the notch 6, resulting in a very large wear amount on the contact surface of the notch 6. When the wear amount 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 die. In view of the above problems, further improvements are made on the basis of the above embodiments.

[0081] Please refer to Figure 6 、 Figure 8 and Figure 12 As shown, a clamping groove 32 is formed at the notch 6 of the first quick-release head 31. The pressure plate 71 is of an annular structure and a clamping block 52 matching the clamping groove 32 is arranged on one side. An adaptive adjustment mechanism 9 is arranged between the clamping block 52 and the pressure plate 71. When the clamping block 52 is engaged with the clamping groove 32, if the friction force between the clamping block 52 and the clamping groove 32 is too large due to the assembly error, the adaptive adjustment mechanism 9 can adjust the position of the clamping block 52 according to the magnitude of the friction force.

[0082] Please refer to Figure 12 As shown, the adaptive adjustment mechanism 9 includes a mounting groove 91 formed in the pressure plate 71. One end of the clamping block 52 close to the mounting groove 91 is fixedly connected with a mounting plate 92. One end of the mounting plate 92 located in the mounting groove 91 is fixedly connected with an adjusting plate 93. The adjusting plate 93 divides the mounting groove 91 into an upper cavity 911 and a lower cavity 912, and hydraulic oil is filled in both the upper cavity 911 and the lower cavity 912.

[0083] A flow channel 94 is formed on one side of the adjusting groove, and a one-way valve member 95 is arranged in the flow channel 94. The hydraulic oil in the upper cavity 911 can enter the lower cavity 912 through the one-way valve member 95.

[0084] Reference Figure 12 As shown, the one-way valve member 95 includes a one-way cavity 951. A sealing ball 952 is provided on one side of the one-way cavity 951 close to the upper cavity 911. A second elastic member 953 is provided between the sealing ball 952 and the one-way cavity 951.

[0085] During use, the worker installs the clamping block 52 in the installation groove 91, and after installation, it is necessary to ensure that the friction force between the clamping block 52 and the clamping groove 32 is greater than the normal value. That is to say, in the initial state, the volume of the upper cavity 911 is larger than that of the lower cavity 912. After installation, 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 mandrel 4. During the initial engagement process, the clamping block 52 and the clamping groove 32 will generate a friction force beyond the normal range. At this time, the clamping block 52 will be subjected to an upward acting force, and the clamping block 52 drives the adjusting plate 93 to move upward. When the hydraulic pressure in the upper cavity 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 cavity 912, and the adjusting plate 93 drives the clamping block 52 to move upward.

[0086] In summary, through the settings of the clamping block 52, the clamping groove 32 and the adaptive adjustment mechanism 9, it is only necessary to ensure that the volume of the upper cavity 911 is larger than that of the lower cavity 912 during installation. When the notches 6 of the first quick-release head 31 and the second quick-release head 51 are initially engaged, the clamping block 52 can be automatically adjusted according to the friction force between the clamping block 52 and the clamping groove 32, avoiding the problem of excessive friction force caused by assembly errors during use.

[0087] Embodiment Five, a method for intelligent elbow pipe stamping and forming, includes the following steps:

[0088] Step 1: Install the first quick-release head 31 and the second quick-release head 51 at the ends of the elbow mandrel 4 and the push rod 122 respectively, and ensure that the notches 6 of the two can engage with each other.

[0089] Step 2: Install the clamping block 52 in the installation groove 91. In the initial state, make the volume of the upper cavity 911 larger than the volume of the lower cavity 912.

[0090] Step 3: Start the driving cylinder 121. The push rod 122 drives the first quick-release head 31 to approach and engage with the second quick-release head 51. After the clamping block 52 is adaptively adjusted according to the magnitude of the frictional force during the engagement process, the driving cylinder 121 resets.

[0091] Step 4: Place the pipe blank 2 in the forming runner 111, and make the end with the protrusion 21 face the first quick-release head 31.

[0092] Step Five: After the upper die and the lower die are engaged, start the driving cylinder 121. Under the stamping of the push rod 122 and the first quick-release head 31, the tube blank 2 is sleeved on the elbow mandrel 4 and gradually formed into an elbow.

[0093] Step Six: The upper die and the lower die are separated, and the elbow mandrel 4 is flipped to one side. The blank is discharged by mechanical assistance or manually.

[0094] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within 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); 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 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. 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 via an electrical signal; 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.

2. The intelligent tube bending stamping and forming equipment according to claim 1, 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 spray holes (83) evenly distributed around the circumference are provided on the outer wall of the first quick-release head (31).

3. The intelligent tube bending stamping and forming equipment according to claim 2 is 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).

4. The intelligent tube bending stamping and forming equipment according to claim 3 is 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).

5. The intelligent tube bending stamping and forming equipment according to claim 4, 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 installation groove (91), 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).

6. The intelligent tube bending stamping and forming equipment according to claim 5, 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).

7. A method for intelligent tube bending stamping, using an intelligent tube bending stamping equipment according to any one of claims 1 to 6, 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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