A bending machine

Abstract

The present invention relates to a bending machine, comprising a main frame structure, a slide mechanism, a hydraulic cylinder and a forming die; wherein the main frame structure comprises a bottom plate and a top plate arranged in parallel, the slide mechanism and the hydraulic cylinder are respectively arranged on the bottom plate and the top plate of the main frame structure; the forming die comprises a punch arranged on a telescopic rod of the hydraulic cylinder, and a first forming lower die and a second forming lower die arranged on the slide mechanism, the first forming lower die and the second forming lower die are used to place a specimen to be bent, the span between the first forming lower die and the second forming lower die can be adjusted by the slide mechanism, and the hydraulic cylinder is used to drive the punch to bend the specimen to be bent. The bending machine can automatically adjust the span between the two forming lower dies through the slide mechanism, is easy to operate, saves time and effort, and can complete the bending process of S-shaped structure specimens, has a simple and compact structure, is easy to transport and freely place, and has wide applicability.

Description

Technical Field

[0001] The present invention relates to the technical field of bending equipment, and more specifically, to a bending machine. Background Art

[0002] According to different production needs, some samples or workpieces need to be made into different bending shapes. There are two ways to bend samples: manual bending and bending machine bending. Manual bending generally uses simple tools to bend the sample manually. It is easy to operate and the processing tools are simple, but the sample bending is not standardized and the accuracy is difficult to guarantee. The existing bending machine bends the sample by placing the sample on the two clamps of the bending machine and bending the sample by driving the pressure head. However, when bending samples of different thicknesses, it is necessary to manually adjust the span of the two clamps. The degree of automation is low and the bending accuracy is low. In addition, the existing bending machine can only bend the sample into a U-shaped structure, while in the bending test of the intergranular corrosion sample, the sample needs to be bent into an S-shaped structure. The existing bending machine cannot complete the bending process of the intergranular corrosion sample. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a bending machine, aiming to solve the problems existing in the prior art.

[0004] According to the present invention, a bending machine is provided, comprising a main frame structure, a slide mechanism, a hydraulic cylinder and a forming die; wherein:

[0005] The main frame structure comprises a bottom plate and a top plate arranged in parallel, and the slide mechanism and the hydraulic cylinder are respectively arranged on the bottom plate and the top plate of the main frame structure;

[0006] The forming mold includes a punch arranged on the telescopic rod of the hydraulic cylinder, and a first forming lower mold and a second forming lower mold arranged on the slide mechanism, the first forming lower mold and the second forming lower mold are used to place the sample to be bent, the span between the first forming lower mold and the second forming lower mold can be adjusted by the slide mechanism, and the hydraulic cylinder is used to drive the punch to bend the sample to be bent.

[0007] Preferably, a groove is formed on the top of the first lower molding die.

[0008] Preferably, a horizontally arranged support plate is provided in the groove, and the support plate is arranged in the groove in an adjustable manner in height.

[0009] Preferably, a positioning mechanism is provided on the top of the second molding lower mold, and the positioning mechanism includes a positioning plate and a locking screw. The positioning plate is provided with a sliding groove, and the locking screw is used to pass through the sliding groove to fix the positioning plate to the second molding lower mold.

[0010] Preferably, the slide mechanism comprises a base, a ball screw transmission mechanism, a drive mechanism and two nut seats; wherein,

[0011] The base is fixed on the bottom plate;

[0012] The ball screw transmission mechanism is arranged on the base, and includes a bidirectional ball screw, a left-handed screw nut, a right-handed screw nut and two screw support seats, the two screw support seats are fixedly arranged on the base, the two ends of the bidirectional ball screw are rotatably connected to the two screw support seats respectively, the left-handed screw nut is arranged on the left-handed thread of the bidirectional ball screw, and the right-handed screw nut is arranged on the right-handed thread of the bidirectional ball screw;

[0013] The driving mechanism is transmission-connected to the bidirectional ball screw and is used to drive the bidirectional ball screw to rotate;

[0014] The two nut seats are respectively fixedly connected to the left-handed lead screw nut and the right-handed lead screw nut, and the first molding lower die and the second molding lower die are respectively fixedly connected to the two nut seats.

[0015] Preferably, the slide mechanism further comprises a guide rail, a slider and a slider fixing plate; wherein,

[0016] There are two guide rails, which are fixed on the base respectively, and are spaced apart and arranged in parallel, and two sliders are slidably arranged on each guide rail;

[0017] The ball screw transmission mechanism is arranged between the two guide rails, and the two sliders on each guide rail are respectively arranged corresponding to the two nut seats;

[0018] The slider fixing plates are provided with two, the two slider fixing plates are respectively fixedly connected to the two nut seats, and the two ends of each slider fixing plate are respectively connected to the two sliders corresponding to the nut seats;

[0019] The first lower molding die and the second lower molding die are respectively fixedly connected to the two slider fixing plates.

[0020] Preferably, the driving mechanism comprises a stepper motor and a reducer, the output shaft of the stepper motor is connected to the input shaft of the reducer, and the output shaft of the reducer is connected to the input shaft of the bidirectional ball screw.

[0021] Preferably, a male mold connecting plate is fixedly provided at the end of the telescopic rod of the hydraulic oil cylinder, and the male mold is detachably connected to the male mold connecting plate;

[0022] A guide shaft is also provided on one side of the hydraulic cylinder. The guide shaft is slidably connected to the top plate up and down, and the lower end of the guide shaft is fixedly connected to the male mold connecting plate.

[0023] Preferably, the bending machine further comprises a safety shield assembly, a power distribution box assembly and a hydraulic power device; wherein,

[0024] The safety shield assembly is detachably connected to the main frame structure, the distribution box assembly is detachably connected to the rear side of the main frame structure, and the hydraulic power device is adjustably arranged on one side of the main frame structure.

[0025] Preferably, a light curtain assembly is provided on the front side of the main frame structure.

[0026] The bending machine provided by the present invention sets two lower forming dies on the sliding table by setting a sliding table mechanism, and the span between the two lower forming dies can be quickly adjusted by driving the sliding table mechanism, without manual adjustment, and is easy to operate, time-saving and labor-saving, and can bend samples of different thicknesses; at the same time, the forming die of the bending machine completes the bending processing of the sample with an S-shaped structure. The bending machine has a simple and compact structure, is easy to transport and freely placed, and has wide applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings.

[0028] Figure 1 A three-dimensional structural schematic diagram of a bending machine according to an embodiment of the present invention is shown.

[0029] Figure 2 A schematic diagram of the three-dimensional structure of the main part of the bending machine according to an embodiment of the present invention is shown.

[0030] Figure 3 A front view of a main body part of a bending machine according to an embodiment of the present invention is shown.

[0031] Figure 4 A state diagram of a sample during bending processing in a bending machine according to an embodiment of the present invention is shown.

[0032] Figure 5 A schematic structural diagram of a sample having an S-shaped structure after being bent twice by a bending machine according to an embodiment of the present invention is shown.

[0033] Figure 6 A schematic diagram of the three-dimensional structure of a slide mechanism in a bending machine according to an embodiment of the present invention is shown.

[0034] Figure 7 A top view of a slide mechanism in a bending machine according to an embodiment of the present invention is shown.

[0035] In the figure: main frame structure 1, bottom plate 11, top plate 12, pillar 13, slide mechanism 2, base 21, guide rail 22, slider 23, bidirectional ball screw 241, left-handed screw nut 242, right-handed screw nut 243, screw support seat 244, nut seat 25, reducer 26, stepper motor 27, slider fixing plate 28, hydraulic cylinder 3, cylinder barrel 31, telescopic rod 32, punch connecting plate 33, guide shaft 34, first molding lower die 41, groove 411, through groove 412, second molding lower die 42, positioning plate 43, locking screw 44, support plate 45, punch 5, safety shield assembly 6, hydraulic power unit 7, distribution box assembly 8, sample 9, light curtain device 10. DETAILED DESCRIPTION

[0036] Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. In each of the accompanying drawings, the same elements are represented by the same or similar reference numerals. For the sake of clarity, the various parts in the accompanying drawings are not drawn to scale.

[0037] The present invention provides a bending machine, comprising a main frame structure 1, a slide mechanism 2, a hydraulic cylinder 3 and a forming die. The main frame structure 1 comprises a bottom plate 11 and a top plate 12 arranged in parallel, the slide mechanism 2 and the hydraulic cylinder 3 are respectively arranged on the bottom plate 11 and the top plate 12 of the main frame structure 1; the forming die comprises a punch 5 arranged on a telescopic rod 32 of the hydraulic cylinder 3, and a first forming lower die 41 and a second forming lower die 42 arranged on the slide mechanism 2, the first forming lower die 41 and the second forming lower die 42 are used to place a specimen to be bent, the span between the first forming lower die 41 and the second forming lower die 42 can be adjusted by the slide mechanism 2, and the hydraulic cylinder 3 is used to drive the punch 5 to bend the specimen to be bent.

[0038] Specifically, Figure 2 and Figure 3 As shown, in this embodiment, the bottom plate 11 and the top plate 12 of the main frame structure 1 are rectangular plate structures of equal size, and the bottom plate 11 and the top plate 12 are fixedly connected together by four pillars 13, and the four pillars 13 are arranged at the four vertex positions of the rectangular bottom plate 11 and the top plate 12. The hydraulic cylinder 3 includes a cylinder barrel 31 and a telescopic rod 32, and the cylinder barrel 31 is fixedly connected to the top plate 12, and a through hole is opened on the top plate 12, and the telescopic rod 32 passes through the through hole and is arranged toward the bottom plate 11.

[0039] Furthermore, a punch connection plate 33 is fixedly provided at the end of the telescopic rod 32 of the hydraulic oil cylinder 3, and the punch 5 is detachably connected to the punch connection plate 33. A guide shaft 34 is also provided on one side of the hydraulic oil cylinder 3, and the guide shaft 34 is slidably connected to the top plate 12 up and down, and the lower end of the guide shaft 34 is fixedly connected to the punch connection plate 33. By providing the punch connection plate 33, the installation and removal of the punch 5 can be facilitated, and the connection of the guide shaft 34 is also convenient. The guide shaft 34 can guide the up and down movement of the punch 5, play a limiting effect, so that the punch 5 can be pressed down more smoothly and accurately to prevent dislocation, and also avoid the situation where the punch 5 is pressed down by only the telescopic rod 32 of the hydraulic oil cylinder 3. The rigidity is insufficient.

[0040] See also Figure 1 The bending machine further comprises a safety shield assembly 6, a power distribution box assembly 8 and a hydraulic power device 7. The safety shield assembly 6 is detachably connected to the main frame structure 1, the power distribution box assembly 8 is detachably connected to the rear side of the main frame structure 1; and the hydraulic power device 7 is adjustably arranged on one side of the main frame structure 1.

[0041] Specifically, the safety shield assembly 6 is detachably connected to the main frame structure 1, which can facilitate the maintenance of the internal structure of the bending machine. The safety shield assembly 6 is a shield body surrounded by thin steel plates, such as Figure 1 As shown, in this embodiment, the safety shield assembly 6 includes a top shield arranged on the top plate 12 for protecting the hydraulic cylinder 3 and its accessories, a bottom shield arranged on the bottom plate 11 for protecting the slide mechanism 2, and a side shield arranged between the top plate 12 and the bottom plate 11 for protecting the components between the top plate 12 and the top plate 12. In this embodiment, shields are arranged on the rear side and the left and right sides of the main frame structure 1, and the front side of the main frame structure 1 is an open structure for inserting and removing the sample through the front opening. The hydraulic power unit 7 includes a hydraulic oil tank, a hydraulic pump, etc., which is used to provide hydraulic power energy for the hydraulic cylinder 3 of the bending machine. In this embodiment, the hydraulic power unit 7 is independently arranged and placed on one side of the support structure to reduce the weight of the main frame structure 1. Rollers are arranged at the bottom of the hydraulic power unit 7, which can facilitate the movement of the hydraulic power unit 7 and the placement position is free. The hydraulic power unit 7 is connected to the hydraulic control valve and the hydraulic cylinder 3 through a hydraulic pipeline.

[0042] See also Figure 4 and Figure 5When the intergranular corrosion sample is bent into an S-shaped structure using the bending machine, it is completed by bending twice. First, the long strip sample is placed on the first molding lower die 41 and the second molding lower die 42, and the sample 9 is pressed down by the punch 5, and one end of the sample 9 is first bent into a U-shaped structure, and then the other end of the sample 9 is reversely bent into the U-shaped structure to form an S-shaped structure. However, when the sample 9 is bent once and then bent twice, the bent part protrudes from the main part of the sample 9 and cannot be placed horizontally on the molding lower die. For this reason, a groove 411 is provided on the top of the first molding lower die 41. When the sample is bent once and then bent twice, the bent part at one end of the sample 9 is placed in the groove 411 of the first molding lower die 41, thereby ensuring that the main part of the sample 9 is placed horizontally on the first molding lower die 41 and the second molding lower die 42. It should be noted that the distance from the outer wall of the first molding lower mold 41 adjacent to the second molding lower mold 42 to the inner wall of the groove 411 should be smaller than the internal width of the U-shaped structure after the sample is bent once, so that when the sample is bent for the second time, the already bent portion of the first bending does not affect the secondary bending of the sample.

[0043] Furthermore, a horizontally arranged support plate 45 is provided in the groove 411 of the first lower molding die 41, and the support plate 45 is arranged in the groove 411 in an adjustable manner. When one end of the specimen is placed in the lower molding die after being bent once, it is not easy for the specimen to remain horizontally placed due to the heavy weight of the bent end. By arranging the support plate 45 in the groove 411 of the first lower molding die 41, the bent end of the specimen can be supported by the support plate 45 to prevent the bent end from being unable to be placed horizontally due to the heavy weight of the bent end. The support plate 45 is arranged in the groove 411 in an adjustable manner, and the support plate 45 can be adjusted to a suitable height according to the size of the bent portion of the specimen, so as to be suitable for specimens of various forms after being bent once. Specifically, in this embodiment, the first molding lower mold 41 is provided with a through groove 412 which is transversely connected to the groove 411, and the support plate 45 is provided with a transversely opened threaded hole. By horizontally passing a screw through the through groove 412 and threadedly connecting it with the threaded hole on the support plate 45, the support plate 45 is fixed to one side wall of the groove 411. The size of the screw head part of the screw is larger than the width of the through groove 412 so that it can be clamped on the outer side wall of the first molding lower mold 41.

[0044] Furthermore, a positioning mechanism is provided on the top of the second molding lower die 42, and the positioning mechanism includes a positioning plate 43 and a locking screw 44. The positioning plate 43 is provided with a slide groove, and the locking screw 44 is used to pass through the slide groove to fix the positioning plate 43 to the second molding lower die 42. The purpose of setting the positioning mechanism is to quickly and accurately position the sample when it is bent. After calculating the centerline position of the bending part of the sample, the position of the positioning plate 43 on the second molding lower die 42 is adjusted so that the distance from the positioning end face of the positioning plate 43 to the center position between the two molding lower dies is equal to the distance from the centerline of the bending part of the sample to the corresponding end face of one end of the sample. In this embodiment, the positioning plate 43 is a rectangular plate-shaped structural steel plate, and two slide grooves are provided on the positioning plate 43. The two slide grooves are arranged in parallel at intervals. The second molding lower die 42 is correspondingly provided with two threaded holes. The two locking screws 44 respectively pass through the two slide grooves on the positioning plate 43 and cooperate with the two threaded holes on the second molding lower die 42 to lock and fix the positioning plate 43 on the top surface of the second molding lower die 42. When adjusting the position of the positioning plate 43 , the locking screw 44 is loosened and the positioning plate 43 is moved horizontally.

[0045] See also Figure 6 and Figure 7 In the bending machine, the slide mechanism 2 includes a base 21, a ball screw transmission mechanism, a driving mechanism and two nut seats 25. The base 21 is fixed on the bottom plate 11 of the main frame structure 1, the ball screw transmission mechanism is arranged on the base 21, and the ball screw transmission mechanism includes a bidirectional ball screw 241, a left-handed screw nut 242, a right-handed screw nut 243 and two screw support seats 244. The two screw support seats 244 are fixed on the base 21, and the two ends of the bidirectional ball screw 241 are respectively rotatably connected to the two screw support seats 244. The left-handed screw nut 242 is arranged on the left-handed thread of the bidirectional ball screw 241, and the right-handed screw nut 243 is arranged on the right-handed thread of the bidirectional ball screw 241. The driving mechanism is in transmission connection with the bidirectional ball screw 241, and is used to drive the bidirectional ball screw 241 to rotate. The two nut seats 25 are fixedly connected to the left-handed screw nut 242 and the right-handed screw nut 243 respectively, and the first molding lower mold 41 and the second molding lower mold 42 are fixedly connected to the two nut seats 25 respectively. When the bidirectional ball screw 241 rotates, it drives the left-handed screw nut 242 and the right-handed screw nut 243 to move in opposite directions, and then drives the two nut seats 25 to move in opposite directions, thereby causing the first molding lower mold 41 and the second molding lower mold 42 to move in opposite directions.

[0046] Furthermore, the slide mechanism 2 also includes a guide rail 22, a slider 23 and a slider fixing plate 28. There are two guide rails 22, which are respectively fixed on the base 21, and the two guide rails 22 are spaced and arranged in parallel, and two sliders 23 are respectively slidably arranged on each guide rail 22. The ball screw transmission mechanism is arranged between the two guide rails 22, and the two sliders 23 on each guide rail 22 are respectively arranged corresponding to the two nut seats 25, and the axial direction of the bidirectional ball screw 241 is consistent with the extension direction of the guide rail 22. There are two slider fixing plates 28, which are respectively fixedly connected to the two nut seats 25, and the two ends of each slider fixing plate 28 are respectively connected to the two sliders 23 arranged corresponding to the nut seats 25, and the first molding lower mold 41 and the second molding lower mold 42 are respectively fixedly connected to the two slider fixing plates 28. After the slider fixing plate 28 is fixed to the nut seat 25 and the slider 23, the sliders 23 at both ends of the slider fixing plate 28 can support and guide the slider fixing plate 28, so that the slider fixing plate 28 can move along the extension direction of the guide rail 22; when the two nut seats 25 move in opposite directions to each other, the two slider fixing plates 28 are driven to move in opposite directions, and then the first molding lower mold 41 and the second molding lower mold 42 are driven to move in opposite directions, so that the span between the first molding lower mold 41 and the second molding lower mold 42 can be changed through the slide mechanism 2 to adapt to the bending of samples of different thicknesses.

[0047] In this embodiment, the driving mechanism includes a stepper motor 27 and a reducer 26, the output shaft of the stepper motor 27 is connected to the input shaft of the reducer 26, and the output shaft of the reducer 26 is connected to the input shaft of the bidirectional ball screw 241. The stepper motor 27 has the effect of precise angle rotation, and the stepper motor 27 is used to drive the bidirectional ball screw to rotate and then drive the two nut seats 25 to move linearly, which has high positioning accuracy and can be accurately positioned, and finally ensures that the span between the first molding lower die 41 and the second molding lower die 42 can be accurately controlled.

[0048] In order to ensure the safety of the bending machine during operation, a light curtain assembly 10 is provided on the front side of the main frame structure 1. Specifically, in this embodiment, a light curtain transmitter and a light curtain receiver are respectively fixedly connected to the two pillars 13 on the front side of the main frame structure 1. When the bending machine is working, once foreign objects enter the internal space of the main frame structure 1 through the front side of the main frame structure 1, the light between the light curtain transmitter and the light curtain receiver will be blocked, and the light curtain assembly 10 sends a shading signal to the controller of the bending machine, and the controller controls the bending machine to stop working to avoid safety accidents.

[0049] In this embodiment, the electrical control system of the bending machine is controlled by PLC; a touch screen panel is provided on the safety cover assembly 6, and the touch screen panel has a visual interface for easy control and operation; a bending operation start and stop button is provided at the front bottom of the main frame structure 1.

[0050] The operation process of using the bending machine provided in this embodiment to bend the intergranular corrosion sample into an S-shaped structure is as follows: first, measure the thickness of the sample before bending, input the measured thickness into the touch screen, and control the stepper motor 27 to drive the reducer 26 to adjust the span between the first molding lower die 41 and the second molding lower die 42; then place the long strip of the sample to be bent on the first molding lower die 41 and the second molding lower die 42, and position the sample through the positioning mechanism on the second molding lower die 42; finally, click the start button on the bending machine, and the punch 5 of the bending machine can automatically press down to a certain position and then rise according to the program set by the PLC, and the sample completes a bending, that is, one end of the sample is bent into a U-shaped structure. Then increase the span between the first molding lower die 41 and the second molding lower die 42, take out the once-bent sample stuck between the two molding lower dies, and restore the span between the first molding lower die 41 and the second molding lower die 42 to the span that meets the bending requirements. A single bending specimen is placed on the first molding lower die 41 and the second molding lower die 42, wherein the bent portion is placed in the groove 411 of the first molding lower die 41, and the bent portion is supported by adjusting the height of the support plate 45 in the groove 411, and the single bending specimen is positioned by the positioning mechanism on the second molding lower die 42, and then the punch 5 is controlled to be pressed down to a certain position and then raised to complete the secondary bending of the specimen, that is, the other end of the specimen is also bent into a U-shaped structure, and finally the specimen is bent as a whole into an S-shaped structure.

[0051] The bending machine provided by the present invention sets two lower forming dies on the sliding table by setting a sliding table mechanism, and the span between the two lower forming dies can be quickly adjusted by driving the sliding table mechanism, without manual adjustment, and is easy to operate, time-saving and labor-saving, and can bend samples of different thicknesses; at the same time, the forming die of the bending machine completes the bending processing of the sample with an S-shaped structure. The bending machine has a simple and compact structure, is easy to transport and freely placed, and has wide applicability.

[0052] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0053] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A bending machine, characterized in that: It includes a main frame structure, a slide mechanism, a hydraulic cylinder and a forming mold; among which, The main frame structure comprises a bottom plate and a top plate arranged in parallel, and the slide mechanism and the hydraulic cylinder are respectively arranged on the bottom plate and the top plate of the main frame structure; The forming die comprises a male die arranged on the telescopic rod of the hydraulic oil cylinder, and a first forming lower die and a second forming lower die arranged on the slide mechanism, the first forming lower die and the second forming lower die are used to place the specimen to be bent, the span between the first forming lower die and the second forming lower die can be adjusted by the slide mechanism, and the hydraulic oil cylinder is used to drive the male die to bend the specimen to be bent; A groove is formed on the top of the first lower molding die; A horizontally arranged support plate is provided in the groove, and the height of the support plate is adjustable in the groove; The first molding lower mold is provided with a through groove that transversely penetrates the groove, and the support plate is provided with a transversely opened threaded hole. A screw is horizontally passed through the through groove, and the screw is threadedly connected to the threaded hole on the support plate to fix the support plate on a side wall of the groove.

2. The bending machine according to claim 1, characterized in that: A positioning mechanism is provided on the top of the second molding lower mold, and the positioning mechanism includes a positioning plate and a locking screw. A sliding groove is provided on the positioning plate, and the locking screw is used to pass through the sliding groove to fix the positioning plate to the second molding lower mold.

3. The bending machine according to claim 1, characterized in that: The slide mechanism includes a base, a ball screw transmission mechanism, a drive mechanism and two nut seats; wherein, The base is fixed on the bottom plate; The ball screw transmission mechanism is arranged on the base, and includes a bidirectional ball screw, a left-handed screw nut, a right-handed screw nut and two screw support seats, the two screw support seats are fixedly arranged on the base, the two ends of the bidirectional ball screw are rotatably connected to the two screw support seats respectively, the left-handed screw nut is arranged on the left-handed thread of the bidirectional ball screw, and the right-handed screw nut is arranged on the right-handed thread of the bidirectional ball screw; The driving mechanism is drivingly connected to the bidirectional ball screw and is used to drive the bidirectional ball screw to rotate; The two nut seats are respectively fixedly connected to the left-handed lead screw nut and the right-handed lead screw nut, and the first molding lower die and the second molding lower die are respectively fixedly connected to the two nut seats.

4. The bending machine according to claim 3, characterized in that: The slide mechanism also includes a guide rail, a slider and a slider fixing plate; wherein, There are two guide rails, which are fixed on the base respectively, and are spaced apart and arranged in parallel, and two sliders are slidably arranged on each guide rail; The ball screw transmission mechanism is arranged between the two guide rails, and the two sliders on each guide rail are respectively arranged corresponding to the two nut seats; The slider fixing plates are provided with two, the two slider fixing plates are respectively fixedly connected to the two nut seats, and the two ends of each slider fixing plate are respectively connected to the two sliders corresponding to the nut seats; The first lower molding die and the second lower molding die are respectively fixedly connected to the two slider fixing plates.

5. The bending machine according to claim 3, characterized in that: The driving mechanism comprises a stepper motor and a reducer, wherein the output shaft of the stepper motor is connected to the input shaft of the reducer, and the output shaft of the reducer is connected to the input shaft of the bidirectional ball screw.

6. The bending machine according to claim 1, characterized in that: A male mold connecting plate is fixedly provided at the end of the telescopic rod of the hydraulic oil cylinder, and the male mold is detachably connected to the male mold connecting plate; A guide shaft is also provided on one side of the hydraulic cylinder. The guide shaft is slidably connected to the top plate up and down, and the lower end of the guide shaft is fixedly connected to the male mold connecting plate.

7. The bending machine according to any one of claims 1 to 6, characterized in that: It also includes a safety shield assembly, a distribution box assembly and a hydraulic power unit; wherein, The safety shield assembly is detachably connected to the main frame structure, the distribution box assembly is detachably connected to the rear side of the main frame structure, and the hydraulic power device is adjustably arranged on one side of the main frame structure.

8. The bending machine according to claim 1, characterized in that: A light curtain assembly is arranged on the front side of the main frame structure.

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