An automatic punch

Abstract

The application belongs to the technical field of automatic punching machines, and particularly relates to an automatic punching machine which comprises a rack, a first hydraulic oil cylinder fixedly installed at the upper end of the rack, a pressing cover fixedly installed at the end of the first hydraulic oil cylinder, a punch movably inserted into the pressing cover, a lower die assembly arranged below the punch, a second hydraulic oil cylinder for driving the punch, the second hydraulic oil cylinder being fixedly installed in the pressing cover, and a waste box placed below the lower die assembly. Since the pressing cover tightly presses the plate blanking position, the tearing force of the punch cannot tear and deform the plate blanking position, so that the flatness of the plate is not deteriorated, and therefore the plate after blanking does not need to be leveled by a leveling machine, which not only reduces the plate processing procedure, but also improves the plate product efficiency.

Description

Technical Field

[0001] This invention belongs to the field of automatic punching machine technology, specifically an automatic punching machine. Background Technology

[0002] A punch press is a stamping press. In national production, automatic stamping technology has become increasingly widely used due to its advantages over traditional machining, such as saving materials and energy, high efficiency, low operator skill requirements, and the ability to produce products that cannot be achieved by machining through the application of various molds.

[0003] Patent CN210676528U discloses a moving platform for punch press unloading, including a punch press, a base, and a moving platform mounted on the top surface of the base. The moving platform includes a rectangular frame and multiple material support rods fixed to the top surface of the rectangular frame. In this solution, the worker places one side of the sheet metal between the clamping column and the cantilever, and the piston rod of the cylinder pushes out, causing the clamping column to press the sheet metal, achieving the purpose of automatic clamping. PLC programming controls the X-axis moving component and the Y-axis moving component to drive the sheet metal to move automatically horizontally for unloading. The operator only needs to lift the sheet metal onto the moving material support rods, and the moving platform will automatically clamp the moving sheet metal. When the X-axis and Y-axis travel is completed, the clamping mechanism will return to the initial position under the control of the program. No worker supervision is required, which greatly reduces the number of workers required to operate the equipment and reduces the company's labor costs. At the same time, the automated moving of the sheet metal improves the efficiency of unloading.

[0004] In the above-mentioned solution, when punching the sheet metal, the sheet metal is fixed on a moving platform, and the punch on the press is used to cut the sheet metal. Since the punch generates tearing force on the cut part of the sheet metal during the punching process, the cut part of the sheet metal is deformed, which makes the flatness of the sheet metal worse. Therefore, after punching the sheet metal, a leveling machine is needed to restore the flatness of the sheet metal, which increases the number of punching processes, not only increasing the processing cost of the sheet metal, but also reducing the efficiency of the finished sheet metal. To this end, the present invention provides an automatic punching machine. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides an automatic punching machine, including a frame, a first hydraulic cylinder fixedly installed at the upper end of the frame, a pressure cover fixedly installed at the end of the first hydraulic cylinder, a punch movably inserted into the pressure cover, a lower die assembly provided below the punch, a second hydraulic cylinder for driving the punch, the second hydraulic cylinder being fixedly installed inside the pressure cover, a waste box placed below the lower die assembly, the lower die assembly including: a lower die body, a countersunk hole opened on the frame, the lower die body being movably installed in the countersunk hole, three sets of guide pillars fixedly connected to the lower die body, a fixing ring fixedly connected to the guide pillars, a third hydraulic cylinder for driving the fixing ring, the third hydraulic cylinder being fixedly installed on the frame, and a die hole for discharging waste material opened on the lower die body;

[0007] Because the pressure cover tightly presses down on the punching position of the sheet metal, the tearing force of the punch cannot tear or deform the punching position of the sheet metal, thus ensuring that the flatness of the sheet metal will not deteriorate. Therefore, the sheet metal after punching does not need to be leveled by a leveling machine, which not only reduces the sheet metal processing steps, but also improves the efficiency of the finished sheet metal product.

[0008] Preferably, three sets of through holes are opened at equal angles inside the countersunk hole, and the guide post is movably inserted into the through hole;

[0009] The combination of the guide post and the through hole guides the movement of the lower mold body.

[0010] Preferably, the pressing cover includes: a protective cover, a first hydraulic cylinder fixedly connected to the upper end of the protective cover, a pressing plate fixedly connected to the lower end of the protective cover, the pressing plate being used to press the plate, a guide sleeve fixedly installed on the pressing plate, a punch being movably inserted into the guide sleeve at the lower end, and a liquid guide pipe connected to the inside of the protective cover, the liquid guide pipe being used to transport lubricating fluid, the punch being movably installed inside the protective cover, a second hydraulic cylinder being fixedly installed inside the protective cover, and several sets of liquid guide grooves being opened on the punch, the liquid guide grooves being used to transport lubricating fluid;

[0011] The lubricant will penetrate into the gap between the punch and the die hole along the inner wall of the die hole. The lubricant can absorb the heat generated by friction between the lower end of the punch and the upper end of the die hole, which not only cools down the punch and the upper end of the die hole, but also lubricates the punch and the die hole, reducing the friction between the punch and the die hole, thereby reducing the wear of the lower end of the punch and the upper end of the die hole and improving the service life of the lower end of the punch and the upper end of the die hole.

[0012] Preferably, the pressure plate includes: a fixed sleeve, which is fixedly installed on the pressure plate; a first gear rotatably installed on the fixed sleeve; several sets of movable plates equally distributed at angles in the inner ring of the first gear; the movable plates are slidably connected to the fixed sleeve; an arc-shaped rubber block is fixedly connected to the movable plates; the arc-shaped rubber block blocks the liquid guide groove; a second gear meshing with the first gear; a screw-in connector, which is fixedly installed on the screw-in connector; the lower end of the screw-in connector is rotatably installed on the fixed sleeve; a movable column is movably inserted into the screw-in connector; the upper end of the movable column is fixedly connected to a punch; and a guide is provided in the middle of the fixed sleeve. The punch has a guide hole at its lower end, which is directly opposite the die hole. An annular groove is provided on the inner ring of the first gear, and the movable plate is movably inserted into the annular groove. Several sets of oblique grooves are provided at equal angles on the first gear. A pin is fixedly installed at the end of the movable plate. The pin is driven along the oblique groove to pull the movable plate to pull the arc-shaped rubber block away from the liquid guide groove. Two sets of guide grooves are provided on the inner ring of the screw tube. Two sets of convex shafts are fixedly installed at the lower end of the movable column. The convex shafts are slidably connected to the guide grooves. The guide grooves are composed of spiral grooves and straight grooves. The convex shafts are driven along the spiral grooves to rotate the screw tube.

[0013] When the punch is withdrawn, the cam will slide back along the guide groove, causing the rotary tube to rotate in the opposite direction, thereby returning several sets of arc-shaped rubber blocks to their initial state. During the punching process, the lubricant cannot drip onto the sheet through the guide groove, which not only prevents the sheet surface from being soiled by the lubricant and keeps the sheet surface clean, but also avoids the lubricant being wasted.

[0014] The beneficial effects of this invention are as follows:

[0015] 1. Before the sheet metal is punched, the punching position is held between the lower die body and the pressure plate. The contact area between the pressure plate and the sheet metal is much larger than the punching area. Because the pressure plate tightly presses the punching position of the sheet metal, the tearing force of the punch cannot tear or deform the punching position of the sheet metal, thus ensuring that the flatness of the sheet metal will not deteriorate. Therefore, the sheet metal after punching does not need to be leveled by a leveling machine, which not only reduces the sheet metal processing steps, but also improves the efficiency of sheet metal finished products.

[0016] 2. When the punch is applied to the sheet metal, the end of the punch cuts the sheet metal downwards along the guide sleeve. The punched waste is pushed into the die hole by the end of the punch. At the same time, the lubricant enters the guide groove on the punch and flows downwards along the guide groove, allowing the lubricant to enter the die hole along with the end of the punch. The lubricant will penetrate into the gap between the punch and the die hole along the inner wall of the die hole. The lubricant can absorb the heat generated by the friction between the lower end of the punch and the upper end of the die hole, which not only cools the punch and the upper end of the die hole, but also lubricates the punch and the die hole, reducing the friction between the punch and the die hole, thereby reducing the wear of the lower end of the punch and the upper end of the die hole and improving the service life of the lower end of the punch and the upper end of the die hole.

[0017] 3. When the punch is cutting downwards, the arc-shaped rubber block will slide along the liquid guide groove. At the same time, the punch pushes the movable column downwards, and the cam on the movable column will first slide along the spiral groove. Under the guidance of the spiral groove, the spiral tube and the second gear will rotate. The rotating second gear drives the first gear to rotate. As the first gear continues to rotate, the pin at the end of the movable plate will slide along the inclined groove. Under the guidance of the inclined groove, the pin, movable plate, and arc-shaped rubber block will move away from the punch until the lower end of the punch touches the plate. Several sets of arc-shaped rubber blocks separate, and the punch continues to cut the plate downwards. The cam slides downwards along the straight groove, and the lubricant flows out through the liquid guide groove to cool the punch and the upper end of the die hole. Conversely, when the punch is retracted, the cam will slide back along the guide groove, so that several sets of arc-shaped rubber blocks return to their initial state. During the process when the punch is not cutting the plate, the lubricant cannot drip onto the plate through the liquid guide groove, which not only avoids the plate surface from being contaminated by the lubricant and keeps the plate surface clean, but also avoids the waste of lubricant. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the structure of the present invention.

[0020] Figure 2 This is a cross-sectional view of the structure of the present invention.

[0021] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0022] Figure 4 This is a cross-sectional view of the lower die body and punch assembly of the present invention.

[0023] Figure 5 This is a cross-sectional view of the assembly of the pressure cover and the punch according to the present invention.

[0024] Figure 6 This is a schematic diagram of the punch, pressure plate, and guide sleeve assembly of the present invention.

[0025] Figure 7 This is a schematic diagram of the punch and guide sleeve assembly in cross-section according to the present invention.

[0026] Figure 8 This is a cross-sectional schematic diagram of the combination of the second gear, the rotating pipe, and the movable column of the present invention.

[0027] In the diagram: 1. Frame; 101. Countersunk hole; 102. Through hole; 2. First hydraulic cylinder; 3. Pressure guard; 4. Punch; 401. Liquid guide groove; 5. Lower die assembly; 6. Scrap box; 7. Second hydraulic cylinder; 8. Plate; 501. Lower die body; 5011. Die hole; 502. Guide post; 503. Retaining ring; 504. Third hydraulic cylinder; 301. Protective cover; 302. Pressure plate; 303 304. Guide sleeve; 3035. Liquid guide tube; 3036. Fixed sleeve; 311. Guide hole; 3037. First gear; 321. Annular groove; 322. Inclined groove; 3038. Movable plate; 331. Pin; 3039. Arc-shaped rubber block; 3030. Second gear; 3030. Rotary tube; 361. Guide groove; 62. Spiral groove; 633. Straight groove; 3030. Movable column; 371. Protruding shaft. Detailed Implementation

[0028] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0029] Example 1

[0030] like Figures 1 to 4 As shown in the embodiment of the present invention, an automatic punching machine includes a frame 1. A first hydraulic cylinder 2 is fixedly installed on the upper end of the frame 1. A pressure cover 3 is fixedly installed at the end of the first hydraulic cylinder 2. A punch 4 is movably inserted into the pressure cover 3. A lower die assembly 5 is arranged below the punch 4. A second hydraulic cylinder 7 is used to drive the punch 4. The second hydraulic cylinder 7 is fixedly installed in the pressure cover 3. A waste box 6 is placed below the lower die assembly 5. The lower die assembly 5 includes: a lower die body 501. A countersunk hole 101 is opened on the frame 1. The lower die body 501 is movably installed in the countersunk hole 101. Three sets of guide pillars 502 are fixedly connected to the lower die body 501. A fixing ring 503 is fixedly connected to the guide pillars 502. A third hydraulic cylinder 504 is used to drive the fixing ring 503. The third hydraulic cylinder 504 is fixedly installed on the frame 1. A die hole 5011 for discharging waste is opened on the lower die body 501.

[0031] Specifically, a moving platform is provided in the direction directly opposite the frame 1. The moving platform is used to fix and transport the sheet metal 8. The moving platform adopts the corresponding mechanism in the moving platform for blanking of a punch press disclosed in CN210676528U. When the sheet metal 8 needs to be punched, the sheet metal 8 is first fixed on the moving platform. The moving platform pushes the sheet metal 8 between the pressure cover 3 and the lower die body 501. Then, the first hydraulic cylinder 2 is activated, which drives the pressure cover 3 to move downward until the lower end face of the pressure cover 3 is in contact with the sheet metal 8. The third hydraulic cylinder 504 is activated, which pulls the fixing ring 503 upward. The fixing ring 503 drives the guide post 502 and the lower die body 501 to move upward until the upper end face of the lower die body 501 presses the sheet metal 8, so that the sheet metal 8 is clamped between the lower die body 501 and the pressure cover 3. The second hydraulic cylinder 504 is activated. Hydraulic cylinder 7 drives punch 4 downward to punch sheet 8. The waste generated during punching falls into waste box 6 through the flow channel in die hole 5011. Then, lower die body 501 is withdrawn to squeeze sheet 8. Sheet 8 is moved again by moving platform, and the punching position of sheet 8 is changed. The above operation is repeated. Compared with the prior art, before sheet 8 is punched by punch 4, the punching position of sheet 8 is clamped between lower die body 501 and pressure cover 3. The contact area between pressure cover 3 and sheet 8 is much larger than the punching area of ​​punch 4. Since pressure cover 3 tightly presses the punching position of sheet 8, the tearing force of punch 4 cannot tear and deform the punching position of sheet 8, thus ensuring that the flatness of sheet 8 will not deteriorate. Therefore, sheet 8 after punching does not need to be leveled by leveling machine, which not only reduces the sheet processing steps, but also improves the finished product efficiency of sheet 8.

[0032] like Figure 3 As shown, three sets of through holes 102 are opened at equal angles inside the countersunk hole 101, and the guide post 502 is movably inserted into the through holes 102.

[0033] Specifically, when the aforementioned fixing ring 503 drives the guide post 502 and the lower mold body 501 to move upward, the guide post 502 slides along the through hole 102. The cooperation between the guide post 502 and the through hole 102 guides the movement of the lower mold body 501.

[0034] Example 2

[0035] like Figure 2 and Figure 5As shown in the comparative embodiment one, another embodiment of the present invention is as follows: the pressing cover 3 includes: a protective cover 301, a first hydraulic cylinder 2 fixedly connected to the upper end of the protective cover 301, a pressing plate 302 fixedly connected to the lower end of the protective cover 301, the pressing plate 302 being used to press the plate 8, a guide sleeve 303 fixedly installed on the pressing plate 302, a punch 4 movably inserted into the guide sleeve 303, and a liquid guide pipe 304 connected to the inside of the protective cover 301, the liquid guide pipe 304 being used to transport lubricating fluid, the punch 4 being movably installed inside the protective cover 301, a second hydraulic cylinder 7 being fixedly installed inside the protective cover 301, and several sets of liquid guide grooves 401 being opened on the punch 4, the liquid guide grooves 401 being used to transport lubricating fluid.

[0036] Specifically, one end of the liquid guide pipe 304 is connected to the pump outlet, and the pump inlet is connected to the lubricant storage tank. During the punching of the sheet metal 8 by the punch 4, the lower end of the punch 4 and the upper end of the die hole 5011 will generate high temperatures due to friction. If cooling is not performed in time, it will cause wear on the lower end of the punch 4 and the upper end of the die hole 5011, reducing their service life. Therefore, during the punching process of the sheet metal 8 being clamped between the lower die body 501 and the pressure cover 3, under the drive of the first hydraulic cylinder 2, the protective cover 301, along with the pressure plate 302 and the guide sleeve 303, moves downwards. Finally, the pressure plate 302 fits against the pressure cover 3. During punching, the lubricant in the lubricant storage tank is slowly drawn into the liquid guide pipe 304 by the pump. The lubricant flows along the liquid guide pipe 304 into the protective cover 301, and the liquid guide pipe 304 will collect above the guide sleeve 303. When the punch 4 is aligned with the sheet metal 8, the end of the punch 4 punches the sheet metal 8 downwards along the guide sleeve 303. The end of the punch 4 pushes the punched waste into the die hole 5011. At the same time, the lubricant enters the guide groove 401 on the punch 4 and flows downwards along the guide groove 401, allowing the lubricant to enter the die hole 5011 along with the end of the punch 4. The lubricant will penetrate into the gap between the punch 4 and the die hole 5011 along the inner wall of the die hole 5011. The lubricant can absorb the heat generated by the friction between the lower end of the punch 4 and the upper port of the die hole 5011, which not only cools the punch 4 and the upper port of the die hole 5011, but also lubricates the punch 4 and the die hole 5011, reducing the friction between the punch 4 and the die hole 5011, thereby reducing the wear of the lower end of the punch 4 and the upper port of the die hole 5011, and improving the service life of the lower end of the punch 4 and the upper port of the die hole 5011.

[0037] like Figures 5 to 8As shown, the pressing plate 302 includes: a fixed sleeve 3031, which is fixedly installed on the pressing plate 302; a first gear 3032 rotatably installed on the fixed sleeve 3031; several sets of movable plates 3033 evenly distributed in the inner ring of the first gear 3032; the movable plates 3033 slidably connected to the fixed sleeve 3031; an arc-shaped rubber block 3034 fixedly connected to the movable plates 3033; the arc-shaped rubber block 3034 blocking the liquid guide groove 401; a second gear 3035 meshing with the first gear 3032; a screw-in pipe 3036, on which the fixed sleeve 3031 is mounted; the lower end of the screw-in pipe 3036 rotatably installed on the fixed sleeve 3031; a movable column 3037 movably inserted into the screw-in pipe 3036; a punch 4 fixedly connected to the upper end of the movable column 3037; and an opening in the middle of the fixed sleeve 3031. A guide hole 311 is provided, and the lower end of the punch 4 is movably inserted into the guide hole 311. The guide hole 311 is directly opposite the die hole 5011. An annular groove 321 is provided on the inner ring of the first gear 3032. The movable plate 3033 is movably inserted into the annular groove 321. Several sets of inclined grooves 322 are provided at equal angles on the first gear 3032. A pin 331 is fixedly installed at the end of the movable plate 3033. The pin 331 is driven along the inclined groove 322 to pull the movable plate 3033 to disengage the arc-shaped rubber block 3034 from contact with the liquid guide groove 401. Two sets of guide grooves 361 are provided on the inner ring of the screw pipe 3036. Two sets of convex shafts 371 are fixedly installed at the lower end of the movable column 3037. The convex shafts 371 are slidably connected to the guide grooves 361. The guide grooves 361 are composed of a spiral groove 61 and a straight groove 62. The convex shafts 371 are driven along the spiral groove 61 to rotate the screw pipe 3036.

[0038] Specifically, after the lubricant flows into the protective cover 301 along the guide pipe 304, during the punching process of the punch 4 on the sheet metal 8, the lubricant will flow out through the guide groove 401 on the punch 4. When the moving platform moves the sheet metal 8 to change the punching position, the lubricant will drip onto the sheet metal 8, making the surface of the sheet metal 8 dirty. This not only requires subsequent cleaning of the sheet metal 8 after punching, but also wastes the lubricant. Therefore, before the punch 4 punches the sheet metal 8, in the initial state, several sets of arc-shaped rubber blocks 3034 surround the punch 4. 3034 is in a combined state, and the arc-shaped rubber block 3034 is tightly attached to the liquid guide groove 401 on the punch 4, so that the punch 4 and the arc-shaped rubber block 3034 are sealed, and the lubricant cannot flow out through the liquid guide groove 401. When the punch 4 punches downward, the arc-shaped rubber block 3034 will slide along the liquid guide groove 401. At the same time, the punch 4 pushes the movable column 3037 to move downward, and the convex shaft 371 on the movable column 3037 will first slide along the spiral groove 61. Under the guidance of the spiral groove 61, the spiral tube 3036 and the second gear 3035 will rotate. The rotating second gear Wheel 3035 drives the first gear 3032 to rotate. As the first gear 3032 rotates continuously, the pin 331 at the end of the movable plate 3033 slides along the inclined groove 322. Guided by the inclined groove 322, the pin 331, the movable plate 3033, and the arc-shaped rubber block 3034 move away from the punch 4 until the convex shaft 371 slides to the intersection of the spiral groove 61 and the straight groove 62. At this time, the lower end of the punch 4 contacts the plate 8, several sets of arc-shaped rubber blocks 3034 separate, and the arc-shaped rubber blocks 3034 detach from contact with the liquid guide groove 401. The punch 4 continues to punch the plate downwards. 8. The cam shaft 371 slides downward along the straight groove 62, and the lubricant flows out through the guide groove 401 to cool the punch 4 and the upper port of the die hole 5011. Conversely, when the punch 4 is retracted, the cam shaft 371 will slide back along the guide groove 361, causing the spindle tube 3036 to rotate in the opposite direction, thereby returning several sets of arc-shaped rubber blocks 3034 to their initial state. During the punching process of the punch 4 not punching the sheet 8, the lubricant cannot drip onto the sheet 8 through the guide groove 401, which not only avoids the surface of the sheet 8 from being dirty by the lubricant and ensures that the surface of the sheet 8 is clean, but also avoids the lubricant being wasted.

[0039] Working principle: First, the sheet metal 8 is fixed on the moving platform. The moving platform pushes the sheet metal 8 between the pressure cover 3 and the lower die body 501. Then, the first hydraulic cylinder 2 is activated, which drives the pressure cover 3 to move downward until the lower end face of the pressure cover 3 is in contact with the sheet metal 8. The third hydraulic cylinder 504 is activated, which pulls the fixing ring 503 upward. The fixing ring 503 drives the guide post 502 and the lower die body 501 to move upward until the upper end face of the lower die body 501 presses the sheet metal 8, so that the sheet metal 8 is clamped between the lower die body 501 and the pressure cover 3. The second hydraulic cylinder 7 is activated, which drives the punch 4 to move downward, so that the punch 4 punches the sheet metal 8. The waste generated by punching falls into the waste box 6 through the flow channel in the die hole 5011. Then, the lower die body 501 is withdrawn to press the sheet metal 8. The moving platform is used to move the sheet metal 8 again, and the punching position of the sheet metal 8 is changed. The above operation is repeated.

[0040] During punching, the lubricant in the lubricant storage tank is slowly pumped into the guide pipe 304 by a pump. The lubricant flows into the protective cover 301 along the guide pipe 304 and gathers above the guide sleeve 303. When the punch 4 is against the plate 8, the end of the punch 4 punches the plate 8 downward along the guide sleeve 303. The end of the punch 4 pushes the punched waste into the die hole 5011. At the same time, the lubricant enters the guide groove 401 on the punch 4 and flows downward along the guide groove 401, so that the lubricant enters the die hole 5011 along the end of the punch 4. The lubricant will penetrate into the gap between the punch 4 and the die hole 5011 along the inner wall of the die hole 5011, thereby cooling the punch 4 and the upper port of the die hole 5011.

[0041] When the punch 4 punches downwards, the arc-shaped rubber block 3034 slides along the liquid guide groove 401. At the same time, the punch 4 pushes the movable column 3037 downwards, and the convex shaft 371 on the movable column 3037 first slides along the spiral groove 61. Under the guidance of the spiral groove 61, the spiral tube 3036 and the second gear 3035 rotate. The rotating second gear 3035 drives the first gear 3032 to rotate. As the first gear 3032 continues to rotate, the pin 331 at the end of the movable plate 3033 slides along the inclined groove 322. Under the guidance of the inclined groove 322, the pin 331, the movable plate 3033, and the arc-shaped rubber block 3034 move away from the punch 4. The punch 4 moves until the cam shaft 371 slides to the intersection of the spiral groove 61 and the straight groove 62. At this time, the lower end of the punch 4 touches the plate 8, and several sets of arc-shaped rubber blocks 3034 separate and detach from the liquid guide groove 401. The punch 4 continues to punch the plate 8 downwards, and the cam shaft 371 slides downwards along the straight groove 62. The lubricant flows out through the liquid guide groove 401 to cool the punch 4 and the upper port of the die hole 5011. Conversely, when the punch 4 is withdrawn, the cam shaft 371 will slide back along the guide groove 361, causing the spiral tube 3036 to rotate in the opposite direction, so that several sets of arc-shaped rubber blocks 3034 return to the initial state, preventing the lubricant from dripping onto the plate 8.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic punching machine, comprising a frame (1), characterized in that: A first hydraulic cylinder (2) is fixedly installed on the upper end of the frame (1). A pressure cover (3) is fixedly installed at the end of the first hydraulic cylinder (2). A punch (4) is movably inserted into the pressure cover (3). A lower die assembly (5) is provided below the punch (4). A second hydraulic cylinder (7) is used to drive the punch (4). The second hydraulic cylinder (7) is fixedly installed inside the pressure cover (3). A waste box (6) is placed below the lower die assembly (5). The lower mold assembly (5) includes: The lower mold body (501) has a countersunk hole (101) on the frame (1), and the lower mold body (501) is movably installed in the countersunk hole (101); Three sets of guide pillars (502) are fixedly connected to the lower mold body (501); A fixing ring (503) is fixedly connected to the guide post (502); A third hydraulic cylinder (504) is used to drive the fixed ring (503). The third hydraulic cylinder (504) is fixedly installed on the frame (1). The lower mold body (501) is provided with a mold hole (5011) for discharging waste material. The pressure cover (3) includes: A protective cover (301) is fixedly connected to the first hydraulic cylinder (2) at its upper end. The pressure plate (302) is fixedly connected to the lower end of the protective cover (301), and the pressure plate (302) is used to press the plate (8). A guide sleeve (303) is fixedly installed on the pressure plate (302), and the lower end of the punch (4) is movably inserted into the guide sleeve (303). A liquid guide tube (304) is connected inside the protective cover (301), and the liquid guide tube (304) is used to transport lubricating fluid; The punch (4) has several sets of liquid guiding grooves (401) for conveying lubricating fluid; The pressure plate (302) includes: A fixing sleeve (3031) is fixedly installed on the pressure plate (302); Rotate the first gear (3032) mounted on the fixed sleeve (3031); A number of movable plates (3033) are equally distributed in the inner ring of the first gear (3032), and the movable plates (3033) are slidably connected to the fixed sleeve (3031). An arc-shaped rubber block (3034) is fixedly connected to the movable plate (3033), and the arc-shaped rubber block (3034) blocks the liquid guiding groove (401). The second gear (3035) meshes with the first gear (3032); A screw-in connector (3036) is provided, and a second gear (3035) fixing sleeve (3031) is mounted on the screw-in connector (3036). The lower end of the screw-in connector (3036) is rotatably mounted on the fixing sleeve (3031). The movable post (3037) is movably connected to the screw tube (3036), and the upper end of the movable post (3037) is fixedly connected to the punch (4). The fixed sleeve (3031) has a guide hole (311) in the middle, and the lower end of the punch (4) is movably inserted into the guide hole (311), with the guide hole (311) facing the die hole (5011). The inner ring of the first gear (3032) is provided with an annular groove (321), and the movable plate (3033) is movably inserted into the annular groove (321). Several sets of oblique grooves (322) are provided at equal angles on the first gear (3032). A pin (331) is fixedly installed at the end of the movable plate (3033). The pin (331) is driven along the oblique groove (322) to make the movable plate (3033) pull the arc-shaped rubber block (3034) to disengage from contact with the liquid guide groove (401). Two sets of guide grooves (361) are provided on the inner ring of the rotating pipe (3036), and two sets of convex shafts (371) are fixedly installed at the lower end of the movable column (3037). The convex shafts (371) are slidably connected to the guide grooves (361). The guide groove (361) is composed of a spiral groove (61) and a straight groove (62), and the convex shaft (371) is driven along the spiral groove (61) to rotate the spindle tube (3036).

2. An automatic punching machine according to claim 1, characterized in that: Three sets of through holes (102) are opened at equal angles inside the countersunk hole (101), and the guide post (502) is movably inserted into the through holes (102).

3. An automatic punching machine according to claim 2, characterized in that: The punch (4) is movably installed inside the protective cover (301), and the second hydraulic cylinder (7) is fixedly installed inside the protective cover (301).

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