A ring die punching press and punching method thereof

Abstract

The present invention discloses a press for ring die punching and a punching method thereof, and belongs to the technical field of presses. The press includes a press body, on which a press workbench and a pressing block are provided, and also includes a base, which is provided on the upper surface of the press workbench, and the base is located directly below the pressing block; a lower punch, which is a component with a large diameter in the middle and a small diameter at the end, which is formed by symmetrically connecting an upper truncated cone and a lower truncated cone of the same shape; an upper punch, which is truncated cone-shaped and matches the shape of the upper truncated cone or the lower truncated cone; a lower punch placement hole, which is provided on the upper surface of the base, for accommodating and fixing the lower punch; a leakage hole, which is a through hole, which is provided on the upper surface of the base, and a chamber is connected below the leakage hole. The present invention arranges a base below the press block, cooperates with the lower punch and the upper punch, and can complete the punching operation by two punchings, which is convenient to operate, has high efficiency in ring die punching processing, and has a low scrap rate.

Description

Technical Field

[0001] The invention belongs to the technical field of presses, and more specifically, relates to a press for ring die punching and a punching method thereof. Background Art

[0002] Punching is a processing method that uses a punch or a die to forge a hole in the blank. Punching is required when forging various hollow forgings. When forging forgings with holes, it is necessary to perform punching deformation in the forging die cavity. When die forging rings on a flat forging machine, final forging punching must be performed after the gathering step. In free forging or die forging, punching is a commonly used processing procedure.

[0003] The punching operation of the ring die is usually carried out on a press. When the press performs the punching process of the ring die, there are usually two methods: reverse extrusion punching and open punching (also called free punching). These two punching methods have their own advantages and disadvantages in terms of process characteristics. The advantage of reverse extrusion punching is that due to the role of the mold, the blank is punched correctly after the mold is adjusted in place, and no eccentric waste will occur. At the same time, the blank of the bottom cutting flat station will not be connected, resulting in folded waste. The disadvantage is that the mold investment is high and the replacement and adjustment are cumbersome; open punching is just the opposite. Its advantage is that the mold investment is small and does not require too much replacement and adjustment. The main disadvantage is that due to free punching, the operator mainly relies on feeling and experience during operation, resulting in the blank being unable to be effectively punched, which is easy to cause eccentric waste, and then the bottom cutting flat station often has connected skin, resulting in folded waste; the existing punching processing methods are either complicated and inefficient, or have a high scrap rate, causing many inconveniences in actual production.

[0004] After searching, the Chinese patent publication number is CN 103394624A; the publication date is November 20, 2013; it discloses an adjustable positioning device for open punching of a press, including a gland, a through hole is opened in the middle of the gland, at least three mounting holes are evenly distributed along the circumferential direction on the outer wall of the gland, and a telescopic positioning rod is installed on each mounting hole, and the two ends of the telescopic positioning rod extend out of the inner and outer sides of the gland outer wall respectively so as to clamp the forging to be processed in the middle. Although the device of the application can perform punching processing on the forging with stable centering and positioning, thus reducing the scrap rate, the device of the application is limited in scope due to the size of the gland, and can only be applied to the punching processing of forgings within a specific range of sizes, and it is relatively complicated to fix the forging to be processed each time, and the processing efficiency is low. Summary of the invention

[0005] 1. Problems to be solved

[0006] In view of the problems of low efficiency and high scrap rate when punching ring dies with a press in the prior art, the present invention provides a press for ring die punching and a punching method thereof. A base is arranged under a pressing block of the press, and a lower punch and an upper punch are cooperated, and the punching operation of the ring die can be completed by two punches. The operation is convenient, the punching processing efficiency is high, and the scrap rate is low.

[0007] 2. Technical solution

[0008] To solve the above problems, the present invention adopts the following technical solutions.

[0009] A ring die punching press comprises a press body, a press workbench and a press block are arranged on the press body, and further comprises:

[0010] A base, which is arranged on the upper surface of the press workbench, and the base is located directly below the pressing block;

[0011] The lower punch is a component composed of an upper truncated cone and a lower truncated cone of the same shape connected symmetrically, with a large diameter in the middle and a small diameter at the end;

[0012] The upper punch is in the shape of a truncated cone, matching the shape of the upper truncated cone or the lower truncated cone;

[0013] A lower punch placement hole is provided on the upper surface of the base and is used to accommodate and fix the lower punch;

[0014] The leakage hole is a through hole, which is opened on the upper surface of the base, and a chamber is connected below the leakage hole.

[0015] The bottom of the press body is the press workbench, which is a workbench with T-slots, and can be used in conjunction with T-bolts to fix the tooling components required during the use of the press on the press workbench. The pressing block is driven by the hydraulic pressure or other driving units in the press body, and the punching action is achieved by up and down movement. The effective area of ​​the pressing block is smaller than the area of ​​the upper surface of the press workbench; the base is arranged on the upper surface of the press workbench and is located directly below the pressing block. The base can be fixedly connected to the press workbench, such as welding, or it can be detachably connected to the press workbench, such as by fasteners such as T-bolts. In order to ensure that the press is also applicable in processing other than punching, the present scheme arranges that the base can be detachably connected to the press workbench, which is convenient for disassembly and replacement when the press is used for other purposes; the lower punch is composed of an upper and lower cones of the same shape, more specifically, the end face of the upper cone with a larger area is connected to the end face of the lower cone with a larger area to form the shape of the lower punch, and the upper cone or The diameter of the end face with a larger area of ​​the lower truncated cone is called the diameter D1 of the lower punch; the upper punch is truncated cone-shaped, and its size matches the upper truncated cone or lower truncated cone of the lower punch. The diameter of the end face with a larger area of ​​the upper punch is called the diameter D2 of the upper punch; further, the diameter D2 of the upper punch is ≤ the diameter D1 of the lower punch, and the diameter D2 of the upper punch is the diameter of the required punching hole; the lower punch placement hole set on the upper surface of the base is used to accommodate and fix the lower punch. More specifically, the lower punch placement hole is a blind hole with a small bottom aperture and a large top aperture, and its shape is the same as the upper truncated cone. Or the shape of the lower cone is the same, that is, when the lower punch is placed in the lower punch placement hole, the upper cone or lower cone part of the lower punch is completely embedded in the lower punch placement hole; a leakage hole is also provided on the upper surface of the base, which is used to allow the lower punch, the upper punch and part of the blank to fall after the punching is completed. Therefore, the minimum aperture D3 of the leakage hole must be greater than or equal to the diameter D2 of the lower punch. The leakage hole is connected to the chamber arranged thereunder, and the side of the chamber is connected to the outside world, mainly to facilitate the removal of the upper punch, the lower punch and part of the blank that fall through the leakage hole after the punching is completed.

[0016] Furthermore, it also includes a positioning unit, which is arranged on the upper surface of the press workbench, and the positioning unit is located below the pressing block side, and the positioning unit includes:

[0017] A shaft rod, which is vertically arranged on one side of the base;

[0018] A swing rod is arranged horizontally, and one end of the swing rod is hinged to the shaft rod;

[0019] A positioning block, which is vertically connected below the other end of the swing rod;

[0020] A positioning arm is arranged horizontally, and the tail end of the positioning arm is connected to the front of the other end of the swing rod;

[0021] After the swing rod rotates to a certain angle, the positioning block will contact the side surface of the base;

[0022] After the positioning block contacts the side surface of the base, the front end of the positioning arm is used to limit the upper punch position.

[0023] The rotating shaft is placed on one side of the base, more specifically, on the side of the base close to the leak hole. One end of the horizontally arranged swing rod is hinged to the rotating shaft and can rotate around the hinge. A positioning block is vertically connected to the bottom of the other end of the swing rod. The positioning block of this scheme is plate-shaped. A positioning arm is horizontally connected to the front of the other end of the swing rod. When the swing rod rotates around the rotating shaft, the positioning block will contact the side of the base. Each time the positioning block contacts the side of the base, the front end of the positioning arm will inevitably be in a fixed position. Using this feature, a suitable positioning arm position length is set so that when the positioning block contacts the side of the base, the front end surface of the positioning arm is just at the upper The position where the side of the punch contacts when it is placed in the center. Therefore, each time the upper punch needs to be placed in the center, the positioning block is made to contact the side of the base by rotating the rocker arm. At this time, the side of the upper punch is placed against the front end face of the positioning arm to achieve the purpose of centering the upper punch. Then the rocker arm is removed and the press body is started to perform the punching operation. Since the positioning unit is located below the side of the pressing block, when the pressing block is driven to complete the stamping action, the positioning unit that removes the rocker arm will not interfere with the normal action of the pressing block. Therefore, the positioning unit will not affect the normal operation of the press body after completing the auxiliary positioning, and the accuracy of the next auxiliary centering will not be affected by whether the rocker arm is removed or not.

[0024] Furthermore, the aperture of the leakage hole increases gradually from top to bottom.

[0025] By setting the aperture of the leak hole to gradually increase from top to bottom, the chance of the upper punch, lower punch or part of the blank contacting the hole wall and getting stuck when passing through the leak hole is further reduced, avoiding the trouble of subsequent unblocking and cleaning, and improving the work efficiency of the punching process.

[0026] Furthermore, the diameter of the top of the leakage hole is 1 to 2 mm larger than the diameter of the middle of the lower punch.

[0027] The top aperture D3 of the leak hole is controlled to be larger than the middle diameter D11~2mm of the lower punch to prevent the lower punch from getting stuck on the hole wall of the leak hole when it falls. At the same time, D3 cannot be too large. An excessively large top aperture of the leak hole will cause the lower punch to have too large a movable range when placed in the leak hole before the secondary stamping, which is not conducive to the auxiliary positioning of the upper punch by the positioning unit. In summary, the diameter of D3 is controlled to be 1~2mm larger than the diameter of D1, so that the lower punch can fall smoothly without affecting the auxiliary positioning of the upper punch by the positioning unit.

[0028] Furthermore, the positioning unit also includes a fine-tuning bolt, which passes through the positioning plate and is arranged horizontally.

[0029] The fine-tuning bolt is set horizontally and passes through the positioning plate and is threadedly connected to the positioning plate. After the rocker arm rotates a certain angle, the end of the fine-tuning bolt first contacts the side of the base to stop the positioning arm. Therefore, the relative position of the end face of the positioning arm when it stops can be adjusted by screwing in or out the fine-tuning bolt. When the positioning unit of this scheme is found to have deviations in the centering of the upper punch during use, the fine-tuning bolt can be adjusted to repair the centering effect and ensure the yield of the punching.

[0030] Furthermore, a positioning recess is provided on the front end surface of the front end of the positioning arm of the positioning unit, and the shape of the positioning recess matches the shape of the side surface of the upper punch.

[0031] By providing a positioning recess whose shape matches the shape of the side surface of the upper punch, after the positioning arm stops moving to the position, when the upper punch is placed, the side surface of the upper punch fits into the positioning recess. This surface contact method is used to position the upper punch, which makes the position of the upper punch more clearly defined and the positioning more accurate, ensuring the centering effect, thereby improving the yield rate of the punching operation.

[0032] Furthermore, a thickened protrusion is provided at the lower part of the front end of the positioning arm of the positioning unit and protrudes downward.

[0033] A thickened protrusion is provided to increase the thickness of the front end of the positioning arm, thereby increasing the area of ​​the positioning recess. When the positioning unit is used to assist in positioning, the position of the upper punch can be more accurately defined, further ensuring the centering positioning effect.

[0034] Furthermore, the shaft of the positioning unit is a screw rod;

[0035] The adjusting nut is connected with the shaft rod to adjust the height of the swing rod.

[0036] In the present embodiment, a through hole is opened vertically downward at one end of the rocker arm, and the rocker arm is sleeved on the shaft rod through the through hole and can rotate around the shaft rod. The shaft rod is a screw rod, and two adjusting nuts are provided, one is provided below the rotating end of the rocker arm, and the other is provided above the rotating end of the rocker arm. By rotating the adjusting nut, the height of the adjusting nut on the shaft rod can be controlled, thereby playing the role of adjusting the horizontal height of the rocker arm.

[0037] Furthermore, a safety rod is connected above the swing rod of the positioning unit, and the safety rod is hinged to the swing rod.

[0038] By setting up a safety rod, which is a long rod movably connected to the rocker arm, the action of pushing the rocker arm can be performed outside the press, and then cooperated with the placement of the upper punch, the ease of placing the upper punch is improved, the completion efficiency of the process is accelerated, and safety hazards are reduced.

[0039] A ring die punching method, the steps are as follows:

[0040] 1. Installation: Install the base and positioning unit on the press workbench, where the base is located directly below the press block and the positioning unit is located below the side of the press block;

[0041] Second, one-time punching: place the lower punch on the lower punch placement hole, place the blank to be processed on the lower punch, start the press to punch once, and obtain the upsetting blank;

[0042] 3. Shift: Remove the upsetting blank together with the lower punch, and align the part of the lower punch exposed outside the upsetting blank with the leak hole;

[0043] 4. Upper punch centering: Rotate the swing rod of the positioning unit, and after the positioning block contacts the side wall of the base, place the side wall of the upper punch in contact with the positioning depression of the positioning arm, and remove the swing rod;

[0044] 5. Secondary punching: Start the press and perform secondary punching to complete the hole forming operation of the blank.

[0045] 3. Beneficial effects

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] (1) The ring die punching press of the present invention has a simple structure and composition, and the cost of adapting and modifying the structure of the present application on the existing press is low. The ring die punching press of the present invention uses the lower punch for one punching, which reduces the difficulty of subsequent punching and improves the final hole forming rate. Then, the lower punch embedded in the blank can be used for positioning, which is convenient for centering during punching, improves the efficiency of the punching process, and is not limited by the overall shape and size of the blank during punching, and has a wide range of applications.

[0048] (2) The ring die punching press of the present invention has an upper punch and a lower punch in a truncated cone shape, which makes it easy to fall from the hole after punching and is not easy to get stuck on the hole wall, thereby greatly improving the punching efficiency;

[0049] (3) The ring die punching press of the present invention assists the upper punch in centering by the positioning unit, thereby ensuring the accuracy of the upper punch placement position and further improving the punching yield rate. The positioning unit can be withdrawn after assisting the upper punch in centering, which will not affect the punching operation of the press, making the operation of the press more convenient, without the need for excessive modification of the press, and the accuracy of the next auxiliary centering is not affected by whether the positioning unit is withdrawn or not;

[0050] (4) The ring die punching press of the present invention further reduces the chance of the upper punch, the lower punch or part of the blank being stuck by the hole wall when passing through the leak hole by setting the hole diameter to gradually increase from top to bottom, thereby avoiding the trouble of subsequent unblocking and cleaning, and improving the work efficiency of the punching process;

[0051] (5) In the ring die punching press of the present invention, the diameter of the top of the leak hole is 1 to 2 mm larger than the diameter of the middle of the lower punch, so that the lower punch can fall smoothly without affecting the auxiliary positioning of the upper punch by the positioning unit;

[0052] (6) The ring die punching press of the present invention is provided with a fine-tuning bolt, so that when the positioning unit finds that the centering of the upper punch is deviated during use, the fine-tuning bolt can be adjusted to repair the centering effect, thereby ensuring the punching yield rate;

[0053] (7) The ring die punching press of the present invention is provided with a positioning recess whose shape matches the shape of the side surface of the upper punch, so that after the swing arm moves to the position and stops, when the upper punch is placed, the side surface of the upper punch fits with the positioning recess. This surface contact method positions the upper punch, defines the position of the upper punch more clearly, and positions it more accurately, thereby ensuring the centering effect, thereby improving the yield rate of the punching operation;

[0054] (8) The ring die punching press of the present invention is provided with a thickened protrusion, so that the thickness of the front end of the positioning arm is increased, thereby increasing the area of ​​the positioning recess. When the positioning unit is used to assist in positioning, the position of the upper punch can be more accurately defined, further ensuring the centering positioning effect;

[0055] (9) The horizontal height position of the positioning arm of the ring die punching press of the present invention is adjustable, which further increases the applicable scope of the ring die punching press of the present invention;

[0056] (10) The ring die punching press of the present invention improves the ease of placing the upper punch operation by providing a safety rod, speeds up the completion efficiency of the process, and thus reduces safety hazards during the use of the press;

[0057] (11) The ring die punching press of the present invention has a simple structure, reasonable design and is easy to manufacture;

[0058] (12) The ring die punching method of the present invention has a simple process. Through one punching, the difficulty of subsequent punching is reduced and the final hole formation rate is improved. Then, the lower punch embedded in the blank can be used for positioning, which is convenient for centering during punching. After the second punching, the punching operation is completed, and the scrap rate is low. In addition, the punching method of this embodiment is not limited by the overall shape and size of the blank and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 It is a schematic diagram of the base, lower punch and upper punch structure of the present invention;

[0060] Figure 2 It is a schematic diagram of the base structure of the present invention;

[0061] Figure 3 It is a schematic diagram of the underpunch structure of the present invention;

[0062] Figure 4 It is the front view of the lower punch of the present invention;

[0063] Figure 5 It is a schematic diagram of the punch structure of the present invention;

[0064] Figure 6 It is the front view of the upper punch of the present invention;

[0065] Figure 7 It is a front view of the base of the present invention;

[0066] Figure 8 A half-section view of the base of the present invention;

[0067] Fig. 9 It is a schematic diagram of the change of the blank during punching;

[0068] Fig.10 It is a schematic diagram of the change of the blank during punching;

[0069] Fig.11 It is a schematic diagram of the structure of the positioning unit of the present invention;

[0070] Fig.12 It is a schematic diagram of the structure of the positioning unit of the present invention;

[0071] Fig.13 It is a structural schematic diagram of the press workbench part of the present invention when it is in working state;

[0072] Fig.14 It is a structural schematic diagram of the press workbench part of the present invention when it is in working state;

[0073] Fig.15 It is a schematic diagram of the structure of the ring die punching press of the present invention;

[0074] Fig.16 It is a schematic diagram of the structure of the press for ring die punching of the present invention.

[0075] In the figure:

[0076] 1. Base; 10. Punch placement hole; 11. Leak hole; 12. Chamber;

[0077] 2. Lower punch; 20. Upper round table; 21. Lower round table;

[0078] 3. Upward rush;

[0079] 4. Positioning unit; 40. Shaft; 41. Rocker; 42. Positioning block; 420. Fine-tuning bolt; 43. Positioning arm; 430. Positioning depression; 431. Thickening protrusion; 44. Adjusting nut; 45. Safety rod;

[0080] 5. Blank;

[0081] 1000, press body; 1001, press workbench; 1002, press block. DETAILED DESCRIPTION

[0082] The present invention is further described below in conjunction with specific embodiments and drawings.

[0083] Example 1

[0084] like Fig.15 and Fig.16 As shown, the ring die punching press of this embodiment includes a press body 1000, on which a press workbench 1001 and a press block 1002 are provided, and also includes:

[0085] A base 1, which is arranged on the upper surface of the press workbench 1001, and the base 1 is located directly below the pressing block 1002;

[0086] The lower punch 2 is a component formed by symmetrically connecting an upper truncated cone 20 and a lower truncated cone 21 of the same shape, with a large diameter in the middle and a small diameter at the end;

[0087] The upper punch 3 is in the shape of a truncated cone, matching the shape of the upper truncated cone 20 or the lower truncated cone 21;

[0088] A lower punch placement hole 10 is provided on the upper surface of the base 1 and is used to accommodate and fix the lower punch 2;

[0089] The leakage hole 11 is a through hole, which is opened on the upper surface of the base 1 , and a chamber 12 is connected below the leakage hole 11 .

[0090] The ring die punching process is usually performed on a press. The structure of the press body 1000 in this embodiment is the same as that of the existing press. The bottom of the press body 1000 is a press workbench 1001, which is a workbench with a T-slot, and can be used with T-bolts to fix the tooling components required during the use of the press on the press workbench 1001. The pressing block 1002 is driven by the hydraulic pressure or other driving units in the press body 1000, and the punching action is achieved by moving up and down. The effective area of ​​the pressing block 1002 is smaller than the area of ​​the upper surface of the press workbench 1001.

[0091] like Fig.13 and Fig.14 As shown, the base 1 is arranged on the upper surface of the press workbench 1001 and is located directly below the pressing block 1002. The base 1 can be fixedly connected to the press workbench 1001, such as by welding, etc., or can be detachably connected to the press workbench 1001, such as by fasteners such as T-bolts. In order to ensure that the press is also applicable when processing other than punching, the base 1 is detachably connected to the press workbench 1001 in this embodiment, which is convenient for disassembly and replacement when the press is used for other purposes;

[0092] The lower punch 2 is formed by connecting an upper truncated cone 20 and a lower truncated cone 21 of the same shape. More specifically, the end surface of the upper truncated cone 20 with a larger area is connected to the end surface of the lower truncated cone 21 with a larger area to form the shape of the lower punch 2. Figure 3 As shown, the diameter of the end surface with a larger area of ​​the upper truncated cone 20 or the lower truncated cone 21 is called the diameter D1 of the lower punch 2. Figure 4 As shown;

[0093] The upper punch 3 is in the shape of a truncated cone, and its size matches the upper truncated cone 20 or the lower truncated cone 21 of the lower punch 2. Figure 5 As shown, the diameter of the end surface of the upper punch 3 with a larger area is called the diameter D2 of the upper punch 3. Figure 6 As shown;

[0094] Further, the diameter D2 of the upper punch 3 is less than or equal to the diameter D1 of the lower punch 2, and the diameter D2 of the upper punch 3 is the diameter of the required punching hole;

[0095] The lower punch placement hole 10 provided on the upper surface of the base 1 is used to accommodate and fix the lower punch 2. More specifically, the lower punch placement hole 10 is a blind hole with a small bottom aperture and a large top aperture. Figure 8 As shown, the shape is the same as the upper truncated cone 20 or the lower truncated cone 21, that is, when the lower punch 2 is placed in the lower punch placement hole 10, the upper truncated cone 20 or the lower truncated cone 21 of the lower punch 2 is completely embedded in the lower punch placement hole 10;

[0096] The upper surface of the base 1 is also provided with a leak hole 11, which is used to allow the lower punch 2, the upper punch 3 and part of the blank 5 to fall after the punching is completed. Therefore, the minimum aperture D3 of the leak hole 11 is greater than or equal to the diameter D2 of the lower punch 2. The leak hole 11 is connected to the chamber 12 arranged below it, and the side of the chamber 12 is connected to the outside world. Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown, it is mainly to facilitate the removal of the upper punch 3, the lower punch 2, and part of the blank 5 that fall through the leak hole 11 after the punching is completed;

[0097] The present application improves the existing press structure, and a base 1 is installed on the press workbench 1001, and then the punching operation is performed through the cooperation of the base 1, the upper punch 3 and the lower punch 2. The upper punch 3 and the lower punch 2 formed by the truncated cone shape ensure that the shape of the punched hole is circular. First, the lower punch 2 is placed in the lower punch placement hole 10 on the base 1. At this time, only the upper truncated cone 20 of the lower punch 2 is exposed on the upper surface of the base 1. The blank 5 of the ring die to be processed is placed on the lower punch 2, as shown in FIG. Fig. 9As shown, the press body 1000 is started to perform a punching operation, and the pressing block 1002 is pressed downward to deform the blank 5, which is called upsetting. Under the support of the lower punch 2, the thickness of the portion of the blank 5 located directly above the lower punch 2 is greatly thinned, and under the action of the stress after the deformation of the blank 5, the upper truncated cone 20 of the lower punch 2 is squeezed and embedded in the upset blank 5, and then the blank 5 is removed together with the lower punch 2 and placed above the leak hole 11. Since the lower truncated cone 21 of the lower punch 2 is partially exposed at the bottom of the blank 5, as shown in FIG. Fig.10 As shown, the lower truncated cone 21 is directly placed in the leak hole 11. With the auxiliary positioning of the lower truncated cone 21, the area with the smallest thickness of the blank 5 is located directly above the leak hole 11. At this time, the upper punch 3 is aligned with the leak hole 11 and placed. The diameter D2 of the upper punch 3 is less than or equal to the diameter D1 of the lower punch 3. Therefore, during the secondary stamping, it can be ensured that the pressure of the bottom end surface of the upper punch 3 acts on the area of ​​the blank 5 with the thinnest thickness after upsetting, thereby ensuring the minimum stamping difficulty and greatly improving the yield rate of the stamping operation. After the stamping is completed, the upper punch 3, part of the blank 5 and the lower punch 2 fall into the chamber 12 through the leak hole 11 and are taken out and continued to be used Because the upper punch 3 and the lower punch 2 are both in the shape of a truncated cone with different side diameters, they are not easy to get stuck in the hole wall of the blank 5 or the hole wall of the leakage hole 11 during the falling process, which improves the working efficiency of the punching operation of the press, and the structure of the ring die punching press of this embodiment is simple, and the cost of adapting and modifying the structure of this application on the existing press is low. The lower punch 2 is used for one-time punching to reduce the difficulty of subsequent punching and improve the final hole formation rate. Then, the lower punch 2 embedded in the blank can be used for positioning, which is convenient for centering during punching. The press of this embodiment is not limited by the overall shape and size of the blank 5 during punching, and has a wide range of applications.

[0098] Example 2

[0099] like Fig.11 and Fig.12 As shown, the ring die punching press of this embodiment is further improved on the basis of embodiment 1, and further includes a positioning unit 4, which is arranged on the upper surface of the press workbench 1001, and the positioning unit 4 is located below the side of the pressing block 1002, and the positioning unit 4 includes:

[0100] A shaft 40, which is vertically arranged on one side of the base 1;

[0101] A swing rod 41 is horizontally arranged, and one end thereof is hinged to the shaft rod 40;

[0102] A positioning block 42, which is vertically connected below the other end of the swing rod 41;

[0103] The positioning arm 43 is horizontally arranged, and the tail end of the positioning arm 43 is connected to the front of the other end of the swing rod 41;

[0104] After the swing rod 41 rotates to a certain angle, the positioning block 42 will contact the side surface of the base 1;

[0105] After the positioning block 42 contacts the side surface of the base 1 , the front end of the positioning arm 43 is used to limit the position of the upper punch 3 .

[0106] Although the cooperation between the leak hole 11 and the lower punch 2 can assist in centering the lower punch 2 and the blank 5, it is difficult to grasp the exact position when placing the upper punch 3. Although the upper punch 3 can be accurately centered by fixing it at a specific position of the pressing block 1002 just above the leak hole 11, this method limits the use scope of the press, so that it can only be used for punching. This embodiment uses a component that does not affect other use functions of the press to achieve accurate centering of the upper punch 3:

[0107] like Fig.13 and Fig.14 As shown, the rotating shaft 40 is placed on one side of the base 1, more specifically, on the side of the base 1 close to the leak hole 11. One end of the horizontally arranged swing rod 41 is hinged to the rotating shaft 40 and can rotate around the hinge. A positioning block 42 is vertically connected to the lower side of the other end of the swing rod 41. The positioning block 42 of this embodiment is plate-shaped. A positioning arm 43 is horizontally connected to the front of the other end of the swing rod 41. When the swing rod 41 rotates around the rotating shaft 40, the positioning block 42 will contact the side of the base 1. Each time the positioning block 42 contacts the side of the base 1, the front end of the positioning arm 43 will inevitably be in a fixed position. Utilizing this feature, a suitable position length of the positioning arm 43 is set so that when the positioning block 42 contacts the side of the base 1, the front end surface of the positioning arm 43 is just The position where the side of the upper punch 3 contacts when it is centered. Therefore, each time the upper punch 3 needs to be centered, the positioning block 42 is made to contact the side of the base 1 by rotating the rocker arm 41. At this time, the side of the upper punch 3 is placed against the front end face of the positioning arm 43 to achieve the purpose of centering the upper punch 3. Then the rocker arm 41 is removed, and the press body 1000 is started to perform the punching operation. Since the positioning unit 4 is located below the side of the pressing block 1002, when the pressing block 1002 is driven to complete the punching action, the positioning unit 4 with the rocker arm 41 removed will not interfere with the normal action of the pressing block 1002. Therefore, the positioning unit 4 will not affect the normal operation of the press body 1000 after completing the auxiliary positioning, and the accuracy of the next auxiliary centering will not be affected by whether the rocker arm 41 is removed or not.

[0108] Example 3

[0109] like Figure 8 As shown, the ring die punching press of this embodiment is further improved on the basis of embodiments 1 and 2, and the aperture of the leakage hole 11 gradually increases from top to bottom.

[0110] By setting the aperture of the leakage hole 11 to gradually increase from top to bottom, the chance of the upper punch 3, the lower punch 2 or part of the blank 5 contacting and getting stuck with the hole wall when passing through the leakage hole 11 is further reduced, avoiding the trouble of subsequent unblocking and cleaning, and improving the work efficiency of the punching process.

[0111] Example 4

[0112] The ring die punching press of this embodiment is further improved on the basis of the embodiment 3, and the top diameter of the leakage hole 11 is larger than the middle diameter of the lower punch 2 by 1 to 2 mm.

[0113] That is, the diameter of D3 is 1 to 2 mm larger than the diameter of D1. In this embodiment, the top aperture D3 of the leakage hole 11 is controlled to be larger than the middle diameter D11 to 2 mm of the lower punch 2 to prevent the lower punch 2 from getting stuck on the hole wall of the leakage hole 11 when falling. At the same time, D3 cannot be too large. An excessively large top aperture of the leakage hole 11 will cause the lower punch 2 to have a too large movable range when placed in the leakage hole 11 before the secondary stamping, which is not conducive to the auxiliary positioning of the upper punch 3 by the positioning unit 4. In summary, the diameter of D3 is controlled to be 1 to 2 mm larger than the diameter of D1, so that the lower punch 2 can fall smoothly without affecting the auxiliary positioning of the upper punch 3 by the positioning unit 4.

[0114] Example 5

[0115] like Fig.11 and Fig.12 As shown, the ring die punching press of this embodiment is further improved on the basis of embodiments 1 to 4, and the positioning unit 4 also includes a fine-tuning bolt 420, and the fine-tuning bolt 420 passes through the positioning plate 42 and is horizontally arranged.

[0116] The fine-tuning bolt 420 is set horizontally and passes through the positioning plate 42 and is threadedly connected to the positioning plate 42. After the rocker arm 41 rotates a certain angle, the end of the fine-tuning bolt 420 first contacts the side of the base 1 to stop the positioning arm 43. Therefore, the relative position of the end face of the positioning arm 43 when it stops can be adjusted by screwing in or out the fine-tuning bolt 420. When the positioning unit 4 of this embodiment is found to have deviations in the centering of the upper punch 3 during use, the fine-tuning bolt 420 can be adjusted to repair the centering effect to ensure the yield of punching.

[0117] Example 6

[0118] like Fig.11 and Fig.12 As shown, the ring die punching press of this embodiment is further improved on the basis of embodiments 1 to 5, and a positioning recess 430 is provided on the front end surface of the positioning arm 43 of the positioning unit 4, and the shape of the positioning recess 430 matches the side shape of the upper punch 3.

[0119] By setting a positioning recess 430 whose shape matches the shape of the side surface of the upper punch 3, after the rocker arm 41 moves to the position and stops, when the upper punch 3 is placed, the side surface of the upper punch 3 fits into the positioning recess 430. This surface contact method is used to position the upper punch 3, which defines the position of the upper punch 3 more clearly and positions it more accurately, ensuring the centering effect, thereby improving the yield rate of the punching operation of the press.

[0120] Example 7

[0121] like Fig.11 and Fig.12 As shown, the ring die punching press of this embodiment is further improved on the basis of Embodiment 6, and a thickened protrusion 431 is provided at the lower front end of the positioning arm 43 of the positioning unit 4 and protrudes downward.

[0122] The thickened protrusion 431 is provided to increase the front end thickness of the positioning arm 43, thereby increasing the area of ​​the positioning recess 430. When the positioning unit 4 is used to assist in positioning, the position of the upper punch 3 can be more accurately defined, further ensuring the centering positioning effect.

[0123] Example 8

[0124] like Fig.11 and Fig.12 As shown, the ring die punching press of this embodiment is further improved on the basis of embodiments 1 to 7, and the shaft 40 of the positioning unit 4 is a screw rod;

[0125] The adjusting nut 44 is connected with the shaft rod 40 to adjust the height of the swing rod 41 .

[0126] In this embodiment, a through hole is opened vertically downward at one end of the rocker arm 41. The rocker arm 41 is sleeved on the shaft rod 40 through the through hole and can rotate around the shaft rod 40. The shaft rod 40 is a screw rod. Two adjusting nuts 44 are provided, one is provided below the rotating end of the rocker arm 41, and the other is provided above the rotating end of the rocker arm 41. By rotating the adjusting nut 44, the height of the adjusting nut 44 on the shaft rod 40 can be controlled, thereby playing a role in adjusting the horizontal height of the rocker arm 41.

[0127] When the thickness of the blank 5 being punched by the press changes, the height position of the upper punch 3 may change sometimes, so it is necessary to reset the height of the positioning arm 43 to continue to cooperate with the upper punch 3 for positioning. The height of the positioning arm 43 can be adjusted through the structure of this embodiment, so that the press of the present application is suitable for use in punching of blanks 5 of various sizes, and has a wider range of applications.

[0128] Example 9

[0129] like Fig.11 and Fig.12As shown, the ring die punching press of this embodiment is further improved on the basis of embodiments 1 to 8, and a safety rod 45 is connected above the swing rod 41 of the positioning unit 4, and the safety rod 45 is hinged to the swing rod 41.

[0130] When centering the upper punch 3, it is necessary to manually push the rocker arm 41 until the positioning block 43 contacts the base 1. In the narrow space between the press workbench 1001 and the pressing block 1002, it is inconvenient to directly push the rocker arm 41 and align and place the upper punch 3 at the same time. Firstly, the efficiency of the press punching process is reduced. Secondly, the operator spends more time on the pressing block 1002, which may pose certain safety hazards. By providing a safety rod 45, which is a long rod movably connected to the rocker arm 41, the action of pushing the rocker arm 41 can be performed outside the press, and then cooperated with the placement of the upper punch 3, thereby improving the ease of operation of placing the upper punch 3, accelerating the completion efficiency of the process, and thereby reducing safety hazards.

[0131] Example 10

[0132] The press punching method of this embodiment comprises the following steps:

[0133] 1. Installation: Install the base 1 and the positioning unit 4 on the press workbench 1001, wherein the base 1 is located directly below the pressing block 1002, and the positioning unit 4 is located below the side of the pressing block 1002;

[0134] Second, punching once: placing the lower punch 2 on the lower punch placement hole 10, placing the blank 5 to be processed on the lower punch 2, starting the press to punch once, and obtaining the upset blank 5;

[0135] 3. Shifting: Remove the upsetting blank 5 together with the lower punch 2, and align the portion of the lower punch 2 exposed outside the upsetting blank 5 with the leak hole 11;

[0136] 4. Alignment of the upper punch: Rotate the swing rod 41 of the positioning unit 4, and after the positioning block 42 contacts the side wall of the base 1, place the side wall of the upper punch 3 in contact with the positioning recess 430 of the positioning arm 43, and remove the swing rod 41;

[0137] 5. Secondary punching: Start the press and perform secondary punching to complete the hole forming operation of the blank 5.

[0138] The base 1 is installed on the press workbench 1001, and the base 1 is installed directly below the pressing block 1002. The positioning unit 4 is installed at a suitable position on the press workbench 1001, and the positioning unit 4 is located below the side of the pressing block 1002. The lower punch 2 is placed in the lower punch placement hole 10 on the base 1. At this time, the lower punch 2 only exposes the upper truncated cone 20 on the upper surface of the base 1. The blank 5 to be processed is placed on the lower punch 2. Fig. 9As shown, the press body 1000 is started to perform a punching operation, and the pressing block 1002 is pressed downward to deform the blank 5 to obtain an upset blank 5. Under the support of the lower punch 2, the thickness of the portion of the blank 5 located directly above the lower punch 2 is greatly thinned, and under the action of the stress after the blank 5 is deformed, the upper truncated cone 20 of the lower punch 2 is squeezed and embedded in the upset blank 5, and then the blank 5 is removed together with the lower punch 2 and placed above the leak hole 11. Since the lower truncated cone 21 of the lower punch 2 is partially exposed at the bottom of the blank 5, as shown in FIG. Fig.10 As shown, the lower truncated cone 21 is directly placed in the leak hole 11. With the auxiliary positioning of the lower truncated cone 21, the area with the smallest thickness of the blank 5 is located directly above the leak hole 11. At this time, the rocker arm 41 of the positioning unit 4 is pushed by the safety rod 45 until the positioning block 42 contacts the side of the base 1, and then the side of the upper punch 3 is placed close to the positioning recess 430 on the end face of the positioning arm 43. At this time, the upper punch 3 is aligned with the leak hole 11 and is located directly above the leak hole 11. Then the rocker arm 41 is withdrawn, and the diameter D2 of the upper punch 3 is less than or equal to the diameter D1 of the lower punch 3. Therefore, during the secondary stamping, it can be ensured that the pressure on the bottom end face of the upper punch 3 acts on the area of ​​the blank 5 with the thinnest thickness after upsetting, thereby ensuring the minimum stamping difficulty, which is extremely convenient. The yield rate of the stamping operation is greatly improved. After the stamping is completed, the upper punch 3, part of the blank 5 and the lower punch 2 fall into the chamber 12 through the leak hole 11, and are taken out and continued to be used. Since the upper punch 3 and the lower punch 2 are both in the shape of a truncated cone and have different side diameters, they are not easy to get stuck in the hole wall of the blank 5 or the hole wall of the leak hole 11 during the falling process, which improves the work efficiency of the punching operation of the press. The stamping method of this embodiment is simple. The lower punch 2 is used for one punching to reduce the difficulty of subsequent punching and improve the final hole formation rate. Then, the lower punch 2 embedded in the blank can be used for positioning, which is convenient for centering during punching. The stamping method of this embodiment is not limited by the overall shape and size of the blank 5 and has a wide range of applications.

[0139] The examples described in the present invention are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made to the technical solutions of the present invention by engineers and technicians in this field should all fall within the protection scope of the present invention.

Claims

1. A ring die punching press, comprising a press body (1000), on which a press workbench (1001) and a press block (1002) are arranged, characterized in that: Also includes: A base (1) is arranged on the upper surface of the press workbench (1001), wherein the base (1) is located directly below the pressing block (1002); The lower punch (2) is a component formed by symmetrically connecting an upper truncated cone (20) and a lower truncated cone (21) of the same shape, with a large diameter in the middle and a small diameter at the end; An upper punch (3) which is in the shape of a truncated cone and matches the shape of the upper truncated cone (20) or the lower truncated cone (21); A lower punch placement hole (10) is provided on the upper surface of the base (1) and is used to accommodate and fix the lower punch (2); A leakage hole (11) which is a through hole and is provided on the upper surface of the base (1); a chamber (12) is connected below the leakage hole (11); It also includes a positioning unit (4), which is arranged on the upper surface of the press workbench (1001), and the positioning unit (4) is located below the side of the pressing block (1002). The positioning unit (4) includes: A shaft (40) vertically disposed on one side of the base (1); A swing rod (41) is arranged horizontally, and one end of the swing rod is hinged to the shaft rod (40); A positioning block (42) vertically connected below the other end of the swing rod (41); A positioning arm (43) is arranged horizontally, and the tail end of the positioning arm (43) is connected to the front of the other end of the swing rod (41); After the swing rod (41) rotates to a certain angle, the positioning block (42) will contact the side surface of the base (1); After the positioning block (42) contacts the side surface of the base (1), the front end of the positioning arm (43) is used to limit the position of the upper punch (3); the positioning block (42) is plate-shaped.

2. A ring die punching press according to claim 1, characterized in that: The hole diameter of the leakage hole (11) gradually increases from top to bottom.

3. A ring die punching press according to claim 2, characterized in that: The diameter of the top of the leakage hole (11) is 1-2 mm larger than the diameter of the middle of the lower punch (2).

4. A ring die punching press according to claim 3, characterized in that: The positioning unit (4) further comprises a fine-tuning bolt (420), wherein the fine-tuning bolt (420) passes through the positioning block (42) and is arranged horizontally.

5. A ring die punching press according to claim 2 or 4, characterized in that: A positioning recess (430) is provided on the front end surface of the positioning arm (43) of the positioning unit (4), and the shape of the positioning recess (430) matches the shape of the side surface of the upper punch (3).

6. A ring die punching press according to claim 5, characterized in that: A thickened protrusion (431) is provided at the bottom of the front end of the positioning arm (43) of the positioning unit (4) and protrudes downward.

7. A ring die punching press according to claim 1, characterized in that: The shaft rod (40) of the positioning unit (4) is a screw rod; and The adjusting nut (44) is connected to the shaft rod (40) to adjust the height of the swing rod (41).

8. A ring die punching press according to claim 1, characterized in that: A safety rod (45) is connected above the swing rod (41) of the positioning unit (4), and the safety rod (45) is hinged to the swing rod (41).

9. A method for punching holes with a press ring die according to claim 5, characterized in that: Here are the steps:

1. Installation: Install the base (1) and the positioning unit (4) on the press workbench (1001), wherein the base (1) is located directly below the pressing block (1002), and the positioning unit (4) is located below the side of the pressing block (1002); 2. Punching once: placing the lower punch (2) on the lower punch placement hole (10), placing the blank to be processed (5) on the lower punch (2), and starting the press to punch once to obtain an upset blank (5); 3. Shifting: Remove the upset blank (5) together with the lower punch (2), and align the portion of the lower punch (2) exposed outside the upset blank (5) with the leak hole (11); 4. Aligning the upper punch: rotating the swing rod (41) of the positioning unit (4), and after the positioning block (42) contacts the side wall of the base (1), placing the side wall of the upper punch (3) in contact with the positioning recess (430) of the positioning arm (43), and removing the swing rod (41); 5. Secondary punching: Start the press to perform secondary punching to complete the hole forming operation of the blank (5).

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