A hydraulic bending machine

Abstract

The present invention belongs to the technical field of bending machines, and specifically is a hydraulic bending machine, comprising a base; two hydraulic cylinders 1 are fixedly installed in the base, a hydraulic rod 1 on the hydraulic cylinder 1 is hinged at the upper end with a lower template, a spring 1 is fixedly installed on the lower surface of the lower template, a support column is fixedly connected to the base, and a top plate is fixedly connected to the upper end of the support column; a hydraulic cylinder 2 is installed on the lower surface of the top plate, a mounting positioning block is fixedly connected to the lower end of the hydraulic rod 2 on the hydraulic cylinder 2, and a pressure block is fixedly installed on the lower surface of the mounting positioning block; the present invention has a simple structure and can realize the adjustment of the bending angle of the bending machine, thereby improving the working efficiency of the bending machine.

Description

Technical Field

[0001] The invention belongs to the technical field of bending machines, in particular to a hydraulic bending machine. Background Art

[0002] The bending machine is an important equipment for bending and forming workpieces in the sheet metal industry. Its function is to press steel plates into parts of various shapes according to process requirements. In the prior art, the bending machine used to bend round tubes, profiles or plate roads generally includes a base and a bending operation table arranged on the base. During the bending operation, the operator will place the workpiece to be bent on the operation table for bending operations. Most of the existing bending machines currently require the operator to manually adjust the bending angle, which will result in the operator constantly adjusting the angle of the workpiece during the bending process to achieve the purpose of adjusting the bending angle.

[0003] There are also some technical solutions for bending machines in the prior art, such as the Chinese patent with application number CN201621445575.5, which includes a vertical support column installed at the rear end of the machine base, a bending machine cross arm installed on the upper end side of the bending machine base, the rear end of the bending machine cross arm is mounted on the vertical support column and fastened by a locking screw, and a movable pressure rod is embedded in the cross arm mounting hole at the front end of the bending machine cross arm; a gear shaft is installed at the front end of the bending machine cross arm, the inner end of the gear shaft extends into the cross arm mounting hole, a gear part is arranged at the inner end of the gear shaft, and a vertically extending rack part is arranged on the movable pressure rod, the gear part of the gear shaft is meshed with the rack part of the movable pressure rod, the right end of the gear shaft extends to the right end side of the bending machine cross arm and the right end of the gear shaft is clamped on the driving handle; a triangular iron block is welded on the lower end of the movable pressure rod, and a milling groove iron block is arranged on the upper surface of the bending machine base directly below the triangular iron block. This technical solution mainly controls the driving handle to drive the triangular iron block under the movable pressure rod to pressurize and bend the workpiece on the milling groove iron block. This technical solution bends the workpiece by directly controlling the movable pressure rod. The bending process is simple, the bending work efficiency is high, and it is easy to use. At the same time, this technical solution also has the problem that the bending angle is fixed and difficult to adjust. Summary of the invention

[0004] In order to make up for the shortcomings of the prior art and solve the problem that the bending angle is fixed and difficult to adjust, the present invention proposes a hydraulic bending machine.

[0005] The technical solution adopted by the present invention to solve its technical problem is as follows: a hydraulic bending machine described in the present invention comprises a base; two hydraulic cylinders 1 are fixedly installed in the base and are symmetrical about the center line in the length direction of the base; the upper end of a hydraulic rod 1 on the hydraulic cylinder 1 is hinged to a lower template, and the lower template does not intersect with the center line in the length direction of the base; the hydraulic rod 1 is hinged to the middle position of the lower template, and a spring 1 is fixedly installed on the lower surface of the lower template, the other end of the spring 1 is fixedly connected to the side of the hydraulic rod 1 located above the upper surface of the base, and the spring 1 is fixedly connected to one end of the lower surface of the lower template close to the center line of the base;

[0006] The base is fixedly connected with a support column, and the upper end of the support column is fixedly connected with a top plate; a hydraulic cylinder 2 is installed on the lower surface of the top plate, and a mounting positioning block is fixedly connected to the lower end of a hydraulic rod 2 on the hydraulic cylinder 2, and a pressure block is fixedly installed on the lower surface of the mounting positioning block, and the lower end of the pressure block is aligned with the center line of the base in the length direction;

[0007] During operation, the workpiece to be bent is placed horizontally on the upper surface of the lower template, and the hydraulic cylinder 2 is started. The hydraulic rod 2 drives the pressure block to squeeze the workpiece downward to bend. At this time, under the action of the downward squeezing force of the pressure block, the two lower templates are tilted in relative directions, and the spring 1 is squeezed and is in a clamping state. At the same time, the opposite ends of the two lower templates are in contact with the upper surface of the base, so that a pressure groove is formed between the two lower templates and the upper surface of the base, so that the pressure block squeezes the workpiece downward to complete the bending. At the same time, since the two lower templates are tilted downward, the waste chips on the workpiece after bending slide down the surface of the workpiece along the tilt angle. After the bending is completed, the hydraulic rod 2 drives the pressure block to return to its original position upward, and the spring 1 returns to its natural state to push the two lower templates in contact with the upper surface of the base to reset, so that the bent workpiece returns to the horizontal position as the lower template is reset to avoid the phenomenon that the bent workpiece is stuck in the pressure groove formed by the lower template and the upper surface of the base due to the extrusion force, so as to ensure the bending efficiency of the bending machine. When the bending angle of the workpiece needs to be adjusted, the hydraulic The oil pressure difference between the upper and lower parts of the piston in the pressure cylinder is adjusted, and then the height of the hydraulic rod one extending out of the upper surface of the base is adjusted. Since the lower template and the hydraulic rod one are hinged together, the height of the lower template will also change with the change of the height of the hydraulic rod one extending out of the upper surface. When the height of the lower template changes, the hydraulic cylinder two is started, and the hydraulic rod two drives the pressure block downward to squeeze the workpiece to bend. At this time, since the height of the lower template has changed and the relative position between the hydraulic cylinder one and the base remains unchanged, after the opposite ends of the two lower templates contact the upper surface of the base, the angle of the pressure groove formed between the two lower templates and the upper surface of the base also changes, thereby changing the bending angle of the workpiece placed on the lower template. After the bending is completed, the hydraulic rod two drives the pressure block to reset upward, and the spring one in the clamping state returns to the natural state to push the lower template with a certain inclination angle due to the extrusion force to reset to a horizontal position, thereby helping the bent workpiece to better detach from the pressure groove, avoiding the occurrence of material jamming, and affecting the working efficiency of the bending machine.

[0008] Preferably, the lower template is evenly provided with mounting holes along the length direction, a heating tube is fixedly installed in the mounting holes, and two nozzles are fixedly installed on the lower surface of the top plate and are symmetrical in the length direction, and the nozzles are located just above the center of the lower template;

[0009] During operation, the workpiece to be bent is placed horizontally on the lower template, and the heating tube is turned on to preheat the workpiece. After the preheating is completed, the hydraulic cylinder 2 is started, and the hydraulic rod 2 drives the pressure block to squeeze the workpiece downward to bend the workpiece. Since the heating tube preheats the workpiece, the workpiece is more likely to undergo plastic deformation than when it was not preheated before, making it easier to bend the workpiece, thereby reducing cracking and rebound after bending, and increasing the bending yield rate. After the bending is completed, the nozzle evenly sprays coolant on the surface of the workpiece to achieve the effect of cooling the workpiece, and at the same time, it will flush the debris generated on the surface of the workpiece during the bending process. Because the nozzle evenly sprays coolant on the workpiece, the cooling effect of the workpiece surface is better and more uniform, reducing the impact of preheating on the strength of the workpiece, improving the bending efficiency, and at the same time reducing the temperature of the workpiece after bending, avoiding injuries to the staff when the staff accidentally touches the workpiece due to excessively high temperature of the workpiece, thereby ensuring the safety of the staff.

[0010] Preferably, the upper surface of the lower template is uniformly provided with grooves along the length direction, a rolling roller is rotatably installed in the groove, the rolling roller is higher than the upper surface of the lower template, and the groove does not intersect with the mounting hole;

[0011] During operation, when the workpiece is bent, the lower template tilts downward from a horizontal state, and a triangular structure is formed between the two lower templates, causing the workpiece to bend and deform, and then the workpiece slides on the lower template after being deformed. Due to the rolling rollers evenly distributed on the upper surface of the lower template, the workpiece undergoes rolling friction with the lower template through the rolling rollers. The workpiece rotates under the drive of the rolling rollers, reducing the friction between the lower surface of the workpiece and the workbench, avoiding direct contact between the workpiece and the lower template to generate sliding friction, thereby damaging the lower surface of the workpiece, causing the surface quality of the workpiece to deteriorate after the bending process, affecting the normal use of the workpiece, and at the same time, due to the action of the rolling rollers, the workpiece is subjected to the same force when sliding on the two lower templates, thereby making the sliding distance of the workpiece relative to the two lower templates the same, avoiding changes in the position of the workpiece relative to the pressure block when the workpiece slips, thereby ensuring that the processing accuracy of the workpiece is not affected.

[0012] Preferably, a memory metal bracket is fixedly installed in the groove, and the memory metal bracket is rotationally connected to the rolling roller;

[0013] During operation, the workpiece to be bent is placed horizontally on the lower template, and the heating tube is started to preheat the workpiece. When the heating tube preheats the workpiece, the memory metal bracket installed in the groove is heated at the same time. In the early stage of preheating, since the memory metal bracket has not reached its memory temperature, the memory metal bracket has not deformed, so that the memory metal bracket is still inside the groove, so the rolling roller connected to the memory metal bracket is also inside the groove. At this time, the workpiece is fully in contact with the upper surface of the lower template, which increases the contact area between the workpiece and the lower template, improves the preheating speed of the workpiece, and reduces the preheating time of the workpiece. Energy loss, when the workpiece reaches the preheating temperature, the memory metal bracket reaches its memory temperature and deforms at the same time, causing the memory metal bracket to protrude out of the groove, thereby driving the rolling roller connected to the memory metal bracket to protrude out of the groove. Finally, the workpiece contacts the rolling roller and rolling friction occurs, avoiding direct contact between the workpiece and the lower template, thereby reducing the friction between the lower surface of the workpiece and the lower template, avoiding the wear of the lower surface of the workpiece caused by sliding friction due to direct contact between the workpiece and the surface of the lower template when bending, and ensuring that the machining accuracy of the workpiece is not affected, and the workpiece can be fully preheated.

[0014] Preferably, a pressure block mounting hole is provided in the second hydraulic rod on the second hydraulic cylinder, the pressure block is slidably mounted in the pressure block mounting hole, and a second spring is fixedly mounted between the upper surface of the pressure block and the lower surface of the mounting positioning block;

[0015] During operation, hydraulic cylinder 2 is started, and hydraulic rod 2 drives the pressure block to squeeze and bend the workpiece downward. When the bottom end of the pressure block contacts the upper surface of the workpiece, as hydraulic rod 2 is pressed downward, spring 2 is in a clamping state, which slows down the bending speed of the pressure block on the workpiece, and avoids the pressure block from exerting a large impact force on the workpiece when it contacts the surface of the workpiece, causing the workpiece to move and affecting the bending accuracy. At the same time, the buffering effect of spring 2 can reduce the impact of the pressure block on the surface of the workpiece, and reduce the damage to the upper surface of the workpiece caused by the bottom end of the pressure block. After that, after the pressure block contacts the bottom surface of the pressure block mounting hole, the pressure block officially starts to bend the workpiece. At the same time, since spring 2 is in a clamping state during the bending process, when the bending is completed, hydraulic rod 2 drives the pressure block to reset. At this time, spring 2 returns to its natural state and exerts a downward force on the workpiece, avoiding damage to the workpiece and the lower template caused by the workpiece falling after the pressure block moves up a distance after bending.

[0016] Preferably, push rods are fixedly installed on both sides of the installation and positioning block, and the push rods are symmetrical about the installation and positioning block along the length direction of the base, and a telescopic rod is installed on the lower surface of one end of the push rod away from the installation and positioning block, and a high-temperature resistant rubber block is hinged at the lower end of the telescopic rod, and the connection between the telescopic rod and the high-temperature resistant rubber block is located at the center position of the upper surface of the high-temperature resistant rubber block, and an expanded graphite block is fixedly connected to the lower surface of the high-temperature resistant rubber block, and the expanded graphite block is located just above one end of the lower template close to the center line of the base, and the lower surface of the expanded graphite block is parallel to and lower than the bottom end of the pressing block;

[0017] During operation, since the push rod is fixedly connected to the installation positioning block, the push rod descends synchronously with the descent of the pressure block. When the pressure block is squeezed downward, the high-temperature resistant rubber block and the expanded graphite block hinged at the lower end of the telescopic rod on the push rod will first contact the upper surface of the workpiece. After that, the workpiece is positioned and fixed by the friction between the expanded graphite block and the workpiece, ensuring that the workpiece does not slip relative to the pressure block during the bending process, thereby ensuring the bending accuracy. At the same time, during the bending process, since the high-temperature resistant rubber block is hinged to the lower end of the telescopic rod, it can be ensured that the high-temperature resistant rubber block and the expanded graphite block are always in close contact with the surface of the workpiece, avoiding the contact surface between the expanded graphite block and the workpiece from shrinking during the bending process, affecting the fixing effect of the expanded graphite block on the workpiece through friction. At the same time, during the bending process, since the expanded graphite block is connected via the high-temperature resistant rubber block, it can be ensured It is proved that the expanded graphite block has a certain elastic space when contacting and fixing the workpiece, so as to avoid the expanded graphite block forcibly squeezing the workpiece and causing damage to the workpiece surface. At the same time, during the bending process, the telescopic rod shrinks synchronously with the downward pressure of the punching die head and the bending deformation of the workpiece, so as to avoid the telescopic rod affecting the bending process of the workpiece. At the same time, after the bending is completed, the hydraulic rod 2 drives the pressing block to return to its original position. Since the lower surface of the expanded graphite block 83 under the push rod is lower than the bottom end of the pressing block, when the pressing block starts to reset, the expanded graphite block is still in contact with the surface of the workpiece, so as to avoid the workpiece falling after the pressing block moves up one end distance after bending, causing damage to the workpiece and the lower template. At the same time, after the bending is completed, the telescopic rod restores its original length, and there is a certain squeezing and pushing effect on the workpiece deformed after bending, which can promote the separation between the workpiece and the pressing block, so as to avoid the workpiece being stuck on the pressing block after the bending is completed, affecting the normal operation of the bending machine.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. The hydraulic bending machine described in the present invention is provided with a hydraulic cylinder 1, a lower template, and a spring 1. By controlling the oil pressure difference between the upper and lower parts of the hydraulic cylinder 1, the height of the hydraulic rod 1 extending out of the upper surface of the base is adjusted, and then the height of the lower template hinged to the hydraulic rod 1 is adjusted. At this time, the relative position between the hydraulic cylinder 1 and the base does not change, but the angle of the groove formed between the lower template and the upper surface of the base changes, and then the bending angle of the workpiece also changes, thereby achieving the effect of adjusting the bending angle of the bending machine. At the same time, the spring 1 promotes the resetting of the lower die formed by the lower template and the lower surface of the base after the workpiece is bent, so as to avoid the workpiece being stuck on the lower die and affecting the efficiency of the bending machine.

[0020] 2. The hydraulic bending machine described in the present invention preheats the workpiece by arranging rolling rollers, memory metal brackets, heating tubes, and nozzles, making the workpiece easier to bend and avoiding wear caused by direct friction between the workpiece and the lower template during bending. At the same time, the memory metal bracket rises after being heated to ensure that the workpiece can be fully preheated. The nozzle evenly sprays coolant on the bent workpiece to cool the workpiece, thereby accelerating the working speed of the bending machine, ensuring the strength of the workpiece, and removing waste chips on the surface of the workpiece.

[0021] 3. The hydraulic bending machine described in the present invention ensures that the pressing block is at the bottom surface of the pressing block mounting hole when bending by arranging hydraulic cylinder 2, pressing block, mounting positioning block, spring 2 and push rod. At this time, spring 2 is in a clamped state. After the workpiece is bent, spring 2 generates a downward force to enable the deformed workpiece after bending to quickly separate from the pressing block. At the same time, the push rod will contact the workpiece surface through the high-temperature resistant rubber block and the expanded graphite block hinged at the lower end of the telescopic rod on the push rod during the bending process. The workpiece is fixed by the friction between the expanded graphite block and the workpiece, ensuring that the position between the deformed workpiece and the pressing block remains relatively unchanged during the bending process, thereby ensuring the bending accuracy and the workpiece yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Figure 2 yes Figure 1 A partial enlarged view of the middle part;

[0025] In the figure: base 11, support column 12, top plate 13, hydraulic cylinder 1 2, lower template 3, heating tube 31, mounting hole 32, rolling roller 33, groove 34, memory metal bracket 35, hydraulic cylinder 2 4, installation positioning block 5, pressure block 6, spring 2 61, nozzle 7, push rod 8, telescopic rod 81, high temperature resistant rubber block 82, expanded graphite block 83, spring 1 9. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0027] like Figure 1 to Figure 2 As shown, a hydraulic bending machine described in the present invention comprises a base 11; two hydraulic cylinders 2 are fixedly installed in the base 11 and are symmetrical about the center line of the length direction of the base 11; the upper end of the hydraulic rod 1 on the hydraulic cylinder 2 is hinged with a lower template 3, and the lower template 3 does not intersect with the center line of the length direction of the base 11; the hydraulic rod 1 is hinged at the middle position of the lower template 3, and a spring 9 is fixedly installed on the lower surface of the lower template 3, and the other end of the spring 9 is fixedly connected to the side of the hydraulic rod 1 located above the upper surface of the base 11, and the spring 9 is fixedly connected to one end of the lower surface of the lower template 3 close to the center line of the base 11;

[0028] The base 11 is fixedly connected with a support column 12, and the upper end of the support column 12 is fixedly connected with a top plate 13; a hydraulic cylinder 2 4 is fixedly installed on the lower surface of the top plate 13, and a mounting positioning block 5 is fixedly connected to the lower end of the hydraulic rod 2 on the hydraulic cylinder 2 4, and a pressing block 6 is fixedly installed on the lower surface of the mounting positioning block 5, and the lower end of the pressing block 6 is aligned with the center line of the base 11 in the length direction;

[0029] When working, the workpiece to be bent is placed horizontally on the upper surface of the lower template 3, and the hydraulic cylinder 2 4 is started. The hydraulic rod 2 drives the pressure block 6 to squeeze the workpiece downward to bend. At this time, under the action of the downward squeezing force of the pressure block 6, the two lower templates are tilted in relative directions, and the spring 1 is squeezed and is in a compressed state. At the same time, the opposite ends of the two lower templates 3 are in contact with the upper surface of the base 11, so that a pressure groove is formed between the two lower templates 3 and the upper surface of the base 11, so that the pressure block 6 squeezes the workpiece downward to complete the bending. At the same time, since the two lower templates 3 are tilted downward, the waste chips on the workpiece after bending slide down the workpiece surface along the inclined angle. After the bending is completed, the hydraulic rod 2 drives the pressure block 6 to return to its original position upward, and the spring 1 9 returns to its natural state to push the two lower templates 3 in contact with the upper surface of the base to reset, so that the bent workpiece returns to the horizontal position as the lower template 3 is reset to avoid the phenomenon that the bent workpiece is stuck in the pressure groove formed by the lower template and the upper surface of the base due to the squeezing force, so as to ensure the bending efficiency of the bending machine. When the bending angle of the workpiece needs to be adjusted, the hydraulic cylinder is The oil pressure difference between the upper and lower parts of the piston in one 2 is adjusted, and then the height of the hydraulic rod one extending out of the upper surface of the base 11 is adjusted. Since the lower template 3 and the hydraulic rod one are hinged together, the height of the lower template 3 will also change with the change of the height of the hydraulic rod one extending out of the upper surface. When the height of the lower template 3 changes, the hydraulic cylinder two 4 is started, and the hydraulic rod two drives the pressure block 6 downward to squeeze and bend the workpiece. At this time, since the height of the lower template 3 has changed and the relative position between the hydraulic cylinder one 2 and the base 11 remains unchanged, after the opposite ends of the two lower templates 3 contact the upper surface of the base, the angle of the pressure groove formed between the two lower templates 3 and the upper surface of the base 11 also changes, thereby changing the bending angle of the workpiece placed on the lower template 3. After the bending is completed, the hydraulic rod two drives the pressure block 6 to reset upward, and the spring one 9 in the clamping state returns to the natural state to push the lower template 3 with a certain inclination angle due to the extrusion force to reset to a horizontal position, thereby helping the workpiece after bending to better escape from the pressure groove, avoiding the occurrence of material jamming, and affecting the working efficiency of the bending machine.

[0030] As an embodiment of the present invention, the lower template 3 is evenly provided with mounting holes 32 along the length direction, and a heating tube 31 is fixedly installed in the mounting hole 32. Two nozzles 7 that are symmetrical in the length direction are fixedly installed on the lower surface of the top plate 13, and the nozzles 7 are located just above the center of the lower template 3.

[0031] During operation, the workpiece to be bent is placed horizontally on the lower template 3, and the heating tube 31 is turned on to preheat the workpiece. After the preheating is completed, the hydraulic cylinder 2 4 is started, and the hydraulic rod 2 drives the pressure block 6 to squeeze the workpiece downward to bend it. Since the heating tube 31 preheats the workpiece, the workpiece is more likely to undergo plastic deformation than when it was not preheated before, making it easier to bend the workpiece, thereby reducing cracking and rebound after bending, and increasing the bending yield rate. After the bending is completed, the nozzle 7 evenly sprays coolant on the surface of the workpiece to achieve the effect of cooling the workpiece, and at the same time, it will flush the debris generated on the surface of the workpiece during the bending process. Because the nozzle 7 evenly sprays coolant on the workpiece, the cooling effect of the workpiece surface is better and more uniform, reducing the influence of preheating on the strength of the workpiece, improving the bending efficiency, and at the same time reducing the temperature of the workpiece after bending, avoiding injuries to the staff when the staff accidentally touches the workpiece due to excessively high temperature of the workpiece, thereby ensuring the safety of the staff.

[0032] As an embodiment of the present invention, the upper surface of the lower template 3 is uniformly provided with grooves 34 along the length direction, and a rolling roller 33 is rotatably installed in the groove 34. The rolling roller 33 is higher than the upper surface of the lower template 3, and the groove 34 does not intersect with the mounting hole 32.

[0033] During operation, when the workpiece is bent, the lower template tilts downward from a horizontal state, and a triangular structure is formed between the two lower templates 3, causing the workpiece to bend and deform, and then the workpiece slides on the lower template 3 after being deformed. Due to the rolling rollers 33 evenly distributed on the upper surface of the lower template 3, the workpiece undergoes rolling friction with the lower template 3 through the rolling rollers 33, and the workpiece rotates under the drive of the rolling rollers 33, thereby reducing the friction between the lower surface of the workpiece and the workbench 3, avoiding direct contact between the workpiece and the lower template 3 to generate sliding friction, thereby damaging the lower surface of the workpiece, causing the surface quality of the workpiece to deteriorate after the bending process, and affecting the normal use of the workpiece. At the same time, due to the action of the rolling rollers 33, the workpiece is subjected to the same force when sliding on the two lower templates 3, thereby making the sliding distance of the workpiece relative to the two lower templates 3 the same, thereby avoiding changes in the position of the workpiece relative to the pressing block 6 when the workpiece slips, thereby ensuring that the processing accuracy of the workpiece is not affected.

[0034] As an embodiment of the present invention, a memory metal bracket 35 is fixedly installed in the groove 34, and the memory metal bracket 35 is rotationally connected to the rolling roller 33;

[0035] During operation, the workpiece to be bent is horizontally placed on the lower template 3, and the heating tube 31 is started to preheat the workpiece. When the heating tube 31 preheats the workpiece, the memory metal bracket 35 installed in the groove 34 is heated at the same time. In the early stage of preheating, since the memory metal bracket 35 has not reached its memory temperature, the memory metal bracket 34 has not deformed, so that the memory metal bracket 34 is still inside the groove 34, so the rolling roller 33 rotatably connected to the memory metal bracket 35 is also inside the groove 34. At this time, the workpiece is fully in contact with the upper surface of the lower template 3, increasing the contact area between the workpiece and the lower template 3, improving the preheating speed of the workpiece, and reducing Energy loss of preheating the workpiece. When the workpiece reaches the preheating temperature, the memory metal bracket 35 reaches its memory temperature and deforms at the same time, causing the memory metal bracket 35 to protrude out of the groove 34, thereby driving the rolling roller 33 connected to the memory metal bracket 35 to protrude out of the groove 34. Finally, the workpiece contacts the rolling roller 33 and rolling friction occurs, avoiding direct contact between the workpiece and the lower template 3, thereby reducing the friction between the lower surface of the workpiece and the lower template 3, avoiding wear on the lower surface of the workpiece caused by sliding friction when the workpiece directly contacts the surface of the lower template 3 when bending, and ensuring that the processing accuracy of the workpiece is not affected, and the workpiece can be fully preheated.

[0036] As an embodiment of the present invention, a pressure block mounting hole is provided in the hydraulic rod 2 on the hydraulic cylinder 2 4, the pressure block 6 is slidably installed in the pressure block mounting hole, and a spring 2 61 is fixedly installed between the upper surface of the pressure block 6 and the lower surface of the installation positioning block 5;

[0037] When working, start the hydraulic cylinder 2 4, and the hydraulic rod 2 drives the pressure block 6 to squeeze and bend the workpiece. When the bottom end of the pressure block 6 contacts the upper surface of the workpiece, as the hydraulic rod 2 is pressed down, the spring 2 61 is in a clamping state, which slows down the bending speed of the pressure block 6 on the workpiece, and avoids the pressure block 6 from having a large impact force on the workpiece when it contacts the surface of the workpiece, causing the workpiece to move and affect the bending accuracy. At the same time, through the buffering effect of the spring 2 61, the impact of the pressure block on the surface of the workpiece can be reduced, and the damage to the upper surface of the workpiece caused by the bottom end of the pressure block 6 can be reduced. After that, after the pressure block 6 contacts the bottom surface of the pressure block 6 mounting hole, the pressure block officially starts to bend the workpiece. At the same time, since the spring 2 61 is in a clamping state during the bending process, when the bending is completed, the hydraulic rod 2 drives the pressure block 6 to reset. At this time, the spring 2 61 returns to its natural state and exerts a downward force on the workpiece, avoiding the damage to the workpiece and the lower template 3 caused by the workpiece falling after the pressure block 6 moves up a distance after bending.

[0038] As an embodiment of the present invention, push rods 8 are fixedly installed on both sides of the installation positioning block 5, and the push rods 8 are symmetrical about the installation positioning block 5 along the length direction of the base 11. A telescopic rod 81 is installed on the lower surface of one end of the push rod 8 away from the installation positioning block 5, and a high-temperature resistant rubber block 82 is hinged at the lower end of the telescopic rod 81. The connection between the telescopic rod 81 and the high-temperature resistant rubber block 82 is located at the center position of the upper surface of the high-temperature resistant rubber block 82, and an expanded graphite block 83 is fixedly connected to the lower surface of the high-temperature resistant rubber block 82. The expanded graphite block 83 is located just above one end of the lower template 3 close to the midline of the base 11, and the lower surface of the expanded graphite block 83 is parallel to the bottom end of the pressing block 6, and the lower surface of the expanded graphite block 83 is parallel to the bottom end of the pressing block 6 and is lower than the bottom end of the pressing block 6;

[0039] During operation, since the push rod 8 is fixedly connected to the mounting positioning block 5, the push rod 8 descends synchronously with the descent of the pressure block 6. When the pressure block 6 is squeezed downward, the high-temperature resistant rubber block 82 and the expanded graphite block 83 hinged at the lower end of the telescopic rod 81 on the push rod 8 will first contact the upper surface of the workpiece. After that, the workpiece is positioned and fixed by the friction between the expanded graphite block 83 and the workpiece, ensuring that the workpiece does not slip relative to the pressure block 6 during the bending process to ensure the bending accuracy. At the same time, during the bending process, since the high-temperature resistant rubber block 82 is hinged to the lower end of the telescopic rod 81, it can be ensured that the high-temperature resistant rubber block 82 and the expanded graphite block 83 are always in close contact with the surface of the workpiece, avoiding the contact surface between the expanded graphite block 83 and the workpiece being reduced during the bending process, affecting the fixing effect of the expanded graphite block 83 on the workpiece through the friction. At the same time, during the bending process, since the expanded graphite block 83 is fixed by the high-temperature resistant rubber block 82 The connection can ensure that the expanded graphite block 83 has a certain elastic space when contacting and fixing the workpiece, so as to avoid the expanded graphite block 83 forcibly squeezing the workpiece and causing damage to the workpiece surface. At the same time, during the bending process, the telescopic rod 81 shrinks synchronously with the downward pressure of the pressure block 6 and the bending deformation of the workpiece, so as to avoid the telescopic rod 81 affecting the bending process of the workpiece. At the same time, after the bending is completed, the hydraulic rod 2 drives the pressure block 6 to return to its original position. Since the lower surface of the expanded graphite block 83 under the push rod 8 is lower than the bottom end of the pressure block 6, when the pressure block 6 starts to reset, the expanded graphite block 83 is still in contact with the workpiece surface, so as to avoid the workpiece falling after the pressure block 6 moves up one end distance after bending, causing damage to the workpiece and the lower template 3. At the same time, after the bending is completed, the telescopic rod 81 restores its original length, and there is a certain squeezing and pushing effect on the workpiece deformed after bending, which can promote the separation between the workpiece and the pressure block 6, so as to avoid the workpiece being stuck on the pressure block 6 after the bending is completed, thereby affecting the normal operation of the bending machine.

[0040] The specific workflow is as follows:

[0041] During operation, the workpiece to be bent is placed horizontally on the upper surface of the lower template 3, and the heating tube 31 is turned on to preheat the workpiece. At this time, the memory metal bracket 35 is also heated. After the workpiece is preheated, the memory metal bracket 35 reaches its memory temperature and begins to expand and float, driving the rolling roller 33 to float together. The rolling roller 33 rises above the upper surface of the lower template 3, and the hydraulic cylinder 2 4 is started. The hydraulic rod 2 drives the pressure block 6 to squeeze downward, and the push rod 8 moves downward synchronously with the pressure block 6. The expanded graphite block 83 moves downward synchronously with the push rod 8 and first contacts the upper surface of the workpiece, pressing Block 6 continues to press down to bend the workpiece. When the pressure block contacts the workpiece, hydraulic rod 2 continues to press down to squeeze spring 2 61. At the same time, pressure block 6 presses down to bend the workpiece. Lower template 3 begins to tilt downward to squeeze spring 1 9. After the bending is completed, hydraulic rod 2 moves upward, driving pressure block 6 and push rod 8 upward together. Spring 61 returns to its natural state, telescopic rod 81 is in an extended state, expanded graphite block 83 still keeps contact with the upper surface of the workpiece, spring 1 9 returns to its natural state, pushes lower template 3 to reset, and nozzle 7 evenly sprays coolant to cool the workpiece. At the same time, when the bending angle of the workpiece needs to be changed, the oil pressure difference between the upper and lower parts of hydraulic cylinder 1 2 is adjusted, and the height position of hydraulic rod 1 is adjusted. Since hydraulic rod 1 is hinged to lower template 3, the height position of lower template 3 also changes with the change of the height position of hydraulic rod 1. The angle of relative downward tilt of lower template 3 during the bending process also changes, thereby adjusting the bending angle of the workpiece.

[0042] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A hydraulic bending machine, characterized in that: The invention comprises a base (11); two hydraulic cylinders (2) are fixedly installed in the base (11) and are symmetrical with respect to the center line of the length direction of the base (11); the upper end of a hydraulic rod (1) on the hydraulic cylinder (2) is hinged to a lower template (3), and the lower template (3) does not intersect with the center line of the length direction of the base (11); the hydraulic rod (1) is hinged to the middle position of the lower template (3), and a spring (9) is fixedly installed on the lower surface of the lower template (3); the other end of the spring (9) is fixedly connected to the side surface of the hydraulic rod (1) located above the upper surface of the base (11), and the spring (9) is fixedly connected to one end of the lower surface of the lower template (3) close to the center line of the base (11); The base (11) is fixedly connected with a support column (12), and the upper end of the support column (12) is fixedly connected with a top plate (13); a second hydraulic cylinder (4) is installed on the lower surface of the top plate (13), and a second hydraulic rod on the second hydraulic cylinder (4) is fixedly connected with a mounting block (5) at the lower end, and a pressure block (6) is fixedly installed on the lower surface of the mounting block (5), and the lower end of the pressure block (6) is aligned with the center line of the base (11) in the length direction; The lower template (3) is evenly provided with mounting holes (32) along the length direction, a heating tube (31) is fixedly installed in the mounting holes (32), and two nozzles (7) are fixedly installed on the lower surface of the top plate (13) and are symmetrical in the length direction, and the nozzles (7) are located directly above the center position of the lower template (3); The upper surface of the lower template (3) is uniformly provided with grooves (34) along the length direction, a rolling roller (33) is rotatably installed in the groove (34), the rolling roller (33) is higher than the upper surface of the lower template (3), the groove (34) and the mounting hole (32) do not intersect, a memory metal bracket (35) is fixedly installed in the groove (34), and the memory metal bracket (35) is rotatably connected to the rolling roller (33); A pressure block mounting hole is provided in the hydraulic rod 2 on the hydraulic cylinder 2 (4), the pressure block (6) is slidably mounted in the pressure block mounting hole, and a spring 2 (61) is fixedly mounted between the upper surface of the pressure block (6) and the lower surface of the mounting positioning block (5); Push rods (8) are fixedly mounted on both sides of the installation positioning block (5). The push rods (8) are symmetrical about the installation positioning block (5) along the length direction of the base. A telescopic rod (81) is mounted on the lower surface of one end of the push rod (8) away from the installation positioning block (5). A high temperature resistant rubber block (82) is hingedly connected to the lower end of the telescopic rod (81). The connection between the telescopic rod (81) and the high temperature resistant rubber block (82) is located at the center position of the upper surface of the high temperature resistant rubber block (82). An expanded graphite block (83) is fixedly connected to the lower surface of the high temperature resistant rubber block (82). The expanded graphite block (83) is located just above one end of the lower template (3) close to the center line of the base (11). The lower surface of the expanded graphite block (83) is parallel to the bottom end of the pressing block (6). The lower surface of the expanded graphite block (83) is parallel to the bottom end of the pressing block (6) and is lower than the bottom end of the pressing block (6).

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