A transformer iron bridge screw hole automatic tapping progressive die

Abstract

The present invention relates to the technical field of transformers, and in particular to an automatic tapping progressive die for screw holes of transformer iron bridges; the die comprises an upper die frame, a lower die frame, a stripping mechanism and a main column for positioning; the main column is arranged between the upper die frame and the lower die frame; a flanging hole punching mechanism for punching flanging holes on a material strip, a tapping mechanism for tapping the flanging holes and a forming mechanism for bending the material strip are arranged in sequence between the upper die frame and the lower die frame; the stripping mechanism is used to separate the material strip from the flanging hole punching mechanism, the tapping mechanism and the forming mechanism; the present invention can simultaneously complete the stamping and tapping processes, omits the intermediate loading and unloading processes, does not require manual operation, has low labor costs, good product quality and high work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of hardware moulds, in particular to an automatic tapping progressive mould for screw holes of a transformer iron bridge. Background Art

[0002] At present, domestic transformer iron bridges are made by stamping. If screw holes need to be set on the ear seat of the iron bridge, it is necessary to process it in two steps: the first step is to stamp the iron bridge body, and the second step is to manually tap and punch the screw holes. In the manual tapping process, if the iron bridge is set with multiple screw holes, multiple manual tapping operations are required.

[0003] The above-mentioned traditional iron bridge production method has the following problems: first, it is manually operated, and the labor cost is high; second, the transfer of the iron bridge from the stamping station to the tapping station cannot be completed on the same equipment, and additional loading and unloading processes are required, resulting in low production efficiency; third, manual stamping cannot guarantee the accurate placement of the iron bridge, and the quality of the screw holes is difficult to guarantee, and the quality of the screw holes does not meet the standards. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a transformer iron bridge screw hole automatic tapping progressive die, which can simultaneously complete the stamping and tapping processes, omit the intermediate loading and unloading processes, do not require manual operation, have low labor costs, good product quality and high work efficiency.

[0005] To achieve the above-mentioned purpose, the specific scheme of the present invention is as follows: a transformer iron bridge screw hole automatic tapping progressive die, comprising an upper die frame, a lower die frame, a stripping mechanism and a main column for positioning; the main column is arranged between the upper die frame and the lower die frame; a flanging hole punching mechanism for punching flanging holes in the material strip, a tapping mechanism for tapping the flanging holes and a forming mechanism for bending the material strip into shape are arranged in sequence between the upper die frame and the lower die frame; the stripping mechanism is used to separate the material strip from the flanging hole stamping mechanism, the tapping mechanism and the forming mechanism; the tapping mechanism comprises a tapping rod for tapping the flanging holes, a transmission device for driving the tapping rod to work and a tapping seat plate arranged on the lower die frame.

[0006] The present invention is further configured as follows: the transmission device includes a transmission gear assembly, a screw rod for driving the transmission gear assembly to work, an upper fixed seat arranged on the upper mold frame, and a lower fixed seat arranged on the tapping seat plate; the screw rod is transmission-connected to the input end of the transmission gear assembly; the tapping rod is installed at the output end of the transmission gear assembly; the transmission gear assembly is fixedly arranged on the top of the lower fixed seat; one end of the screw rod is rotationally connected to the upper fixed seat; the other end of the screw rod is sequentially inserted into the transmission gear assembly and the lower fixed seat.

[0007] The present invention is further configured such that the transmission gear assembly comprises a nut threadedly connected to the screw rod and a gear set meshing with the nut; the gear set drives the tapping rod to rotate.

[0008] The present invention is further configured that a feeding detection device is also provided between the flanging hole stamping mechanism and the tapping mechanism; the feeding detection device comprises a fixed block, a movable block, a cylinder, a push rod, a contact piece and a detection needle for detecting the position of the flanging hole; the fixed block is fixedly arranged on the tapping seat plate; the movable block is slidably connected with the fixed block in the vertical direction; a push rod vertical groove is provided on one side of the movable block; a detection needle vertical groove is provided on the other side of the movable block; one end of the push rod is threadedly connected with the push rod vertical groove, and the other end of the push rod is connected with the output end of the cylinder; the detection needle is slidably connected with the detection needle vertical groove; and the bottom end of the detection needle passes through the bottom end of the movable block; the contact piece is provided above the detection needle vertical groove.

[0009] The present invention is further configured such that a plurality of equal height sleeves and springs are provided at the bottom of the tapping seat plate.

[0010] The present invention is further configured as follows: the flanging hole stamping mechanism includes a left punch assembly, a left male clamping plate arranged on the upper die frame, and a left lower template arranged on the lower die frame; the left punch assembly is fixedly arranged on the left male clamping plate; the forming mechanism includes a right punch assembly, a right male clamping plate arranged on the upper die frame, and a right lower template arranged on the lower die frame; the right punch assembly is fixedly arranged on the right male clamping plate; the stripping mechanism includes a left double-layer stripping plate arranged under the left male clamping plate and a right double-layer stripping plate arranged under the right male clamping plate; the left double-layer stripping plate is provided with a first opening for the left punch assembly to pass through; the right double-layer stripping plate is provided with a second opening for the right punch assembly to pass through.

[0011] The present invention is further configured such that the left punch assembly is provided with a flanging hole punch; a hemispherical portion is provided at the top of the flanging hole punch; and a conical portion is provided at the top of the hemispherical portion.

[0012] The present invention is further configured such that the radius of the hemispherical portion is 1.70 mm-1.90 mm; and the cone angle of the conical portion is 30 degrees.

[0013] The present invention is further configured such that the forming mechanism also includes a dead point detection device; the dead point detection device includes an inductor, a sensor and a fixed frame seat; the inductor is arranged on one side of the right double-layer stripping plate; the fixed frame seat is arranged on one side of the right lower template; and the fixed frame seat is located directly below the inductor; the sensor is installed on the top of the fixed frame seat; the lower edge of the inductor is at the same horizontal position as the lower edge of the right double-layer stripping plate.

[0014] The present invention is further configured such that the tapping seat plate is also provided with a tapping detection device for detecting the condition of the tapping rod; the tapping detection device is arranged below the tapping rod.

[0015] The beneficial effects of the present invention are: it can complete the stamping and tapping processes at the same time, omitting the intermediate loading and unloading processes, and does not require manual operation, with low labor costs, good product quality, and high work efficiency; it not only manufactures the iron bridge body, but also manufactures the screw holes, which improves production efficiency and saves manufacturing costs. The order of the workstations is reasonably arranged, and they are divided into the front workstation, the middle workstation, and the rear workstation; the tapping mechanism structure is carefully set to ensure that the tapping machine is accurately positioned, moves smoothly, and has high repetition accuracy when moving up and down. The shape and size of the flanging hole punch that carries the thread are cleverly designed, with the right size, easy to tap, and convenient for customers to tighten the screws, which greatly improves the quality of the iron bridge; a tapping detection device, a feeding detection device, and a dead point detection device are used to ensure that each screw hole is inspected, the product qualification rate is high, and the safety of the mold and the punch is protected. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 A front view of the present invention;

[0019] Figure 3 for Figure 2 A-A' cross-sectional view;

[0020] Figure 4 It is a structural schematic diagram of the tapping mechanism of the present invention;

[0021] Figure 5 It is a structural schematic diagram of the forming mechanism of the present invention;

[0022] Figure 6 It is a schematic diagram of the internal structure of the feeding detection device of the present invention;

[0023] Figure 7 It is a schematic structural diagram of the flanging hole punch of the present invention.

[0024] Among them: 11-upper die frame; 12-lower die frame; 13-dominant column; 3-tapping mechanism; 22-left male clamping plate; 23-left lower template; 21-left double-layer stripping plate; 25-flanging hole punch; 251-hemispherical part; 252-conical part; 31-tapping rod; 32-transmission device; 33-tapping seat plate; 321-transmission gear assembly; 322-screw; 34-upper fixed seat; 35-lower fixed Seat; 36-equal height sleeve; 37-spring; 41-right punch assembly; 42-right male clamping plate; 43-right lower template; 44-right double-layer stripping plate; 51-fixed block; 52-movable block; 53-cylinder; 54-push rod; 55-contact sheet; 56-push rod vertical slot; 57-detection needle vertical slot; 58-detection needle; 61-induction body; 62-sensor; 63-fixed bracket; 7-tapping detection device. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the implementation scope of the present invention is not limited thereto.

[0026] like Figure 1-7 As shown, the automatic tapping progressive die for the screw holes of the transformer iron bridge described in this embodiment includes an upper die frame 11, a lower die frame 12, a stripping mechanism and a main column 13 for positioning; the main column 13 is arranged between the upper die frame 11 and the lower die frame 12; a flanging hole punching mechanism for punching flanging holes in the material strip, a tapping mechanism 3 for tapping the flanging holes and a forming mechanism for bending the material strip are arranged in sequence between the upper die frame 11 and the lower die frame 12; the stripping mechanism is used to separate the material strip from the flanging hole stamping mechanism, the tapping mechanism 3 and the forming mechanism; the tapping mechanism 3 includes a tapping rod 31 for tapping the flanging holes, a transmission device 32 for driving the tapping rod 31 to work and a tapping seat plate 33 arranged on the lower die frame 12.

[0027] Specifically, the punching mechanism is set to have a sufficient width so that its width value satisfies the positive integer multiple of the step distance, ensuring seamless connection between the front and rear stations; when working, the material strip is sent to the mold entrance by the feeder in a stepping manner, and then the flanging hole punching mechanism performs a preliminary punching process on the material strip, including punching out the ear seat contour, foot shape and flanging hole of the iron bridge; then the tapping mechanism 3 performs the tapping process on the flanging hole; then the forming mechanism performs the final punching and bending forming process on the material strip. No manual operation is required, the labor cost is low, the product quality is good, and the work efficiency is high; while completing the punching and tapping processes, both the iron bridge body and the screw hole are made, which improves production efficiency and saves manufacturing costs.

[0028] like Figure 1-4As shown, the present embodiment describes an automatic tapping progressive die for screw holes of a transformer iron bridge, wherein the transmission device 32 comprises a transmission gear assembly 321, a screw rod 322 for driving the transmission gear assembly 321 to work, an upper fixed seat 34 arranged on the upper mold frame 11, and a lower fixed seat 35 arranged on the tapping seat plate 33; the screw rod 322 is transmission-connected with the input end of the transmission gear assembly 321; the tapping rod 31 is installed at the output end of the transmission gear assembly 321; the transmission gear assembly 321 is fixedly arranged on the top of the lower fixed seat 35; one end of the screw rod 322 is rotationally connected with the upper fixed seat 34; the other end of the screw rod 322 is sequentially passed through the transmission gear assembly 321 and the lower fixed seat 35.

[0029] Specifically, a plurality of gear groups connected to the screw rod 322 are provided inside the transmission gear assembly 321; when the upper mold frame 11 is pressed downward, the screw rod 322 provided on the upper fixed seat 34 is driven to rotate, and then the screw rod 322 drives the internal gear group of the transmission gear assembly 321 to rotate. Since the tapping rod 31 is installed at the output end of the transmission gear assembly 321, the tapping rod 31 is driven to perform the tapping process on the flanging hole.

[0030] like Figure 3-4 As shown, the embodiment of the invention is a progressive die for automatic tapping of screw holes of a transformer bridge, wherein the transmission gear assembly 321 comprises a nut threadedly connected to a screw rod 322 and a gear set meshing with the nut; the gear set drives the tapping rod 31 to rotate.

[0031] The gear set includes a first gear, a second gear and a third gear, which are meshed with each other. A bearing is provided on the first gear, and the nut is provided on the bearing. The tapping rod 31 is installed on the third gear and is transmission-connected with the third gear. The screw rod 322 drives the first gear to rotate through the nut, thereby driving the tapping rod 31 to perform the tapping process.

[0032] like Figure 4 and Figure 6As shown, in the automatic tapping progressive die for the screw holes of the transformer iron bridge described in this embodiment, a feeding detection device is also provided between the flanging hole stamping mechanism and the tapping mechanism 3; the feeding detection device comprises a fixed block 51, a movable block 52, a cylinder 53, a push rod 54, a contact piece 55 and a detection needle 58 for detecting the position of the flanging hole; the fixed block 51 is fixedly arranged on the tapping seat plate 33; the movable block 52 is slidably connected with the fixed block 51 in the vertical direction; a push rod vertical groove 56 is provided on one side of the movable block 52; a detection needle vertical groove 57 is provided on the other side of the movable block 52; one end of the push rod 54 is threadedly connected to the push rod vertical groove 56, and the other end of the push rod 54 is connected to the output end of the cylinder 53; the detection needle 58 is slidably connected to the detection needle vertical groove 57; and the bottom end of the detection needle 58 passes through the bottom end of the movable block 52; the contact piece 55 is arranged above the detection needle vertical groove 57.

[0033] Specifically, the contact piece 55 is electrically connected to a controller that controls the operation of the upper mold frame 11 through a wire;

[0034] The detection needle 58 is used to extend into the flanging hole on the material strip to detect whether the position of the flanging hole is normal; in the initial position, the detection needle 58 is located at the bottom of the detection needle vertical groove 57 under the action of gravity. At this time, the top of the detection needle 58 does not contact the contact piece 55; when the position of the flanging hole is normal, under the operation of the cylinder 53, the push rod 54 drives the movable block 52 to slide vertically downward on the fixed block 51, driving the detection needle 58 to slide downward. If the position of the flanging hole is correct, the detection needle 58 will pass through the position of the flanging hole without obstruction; if the position of the flanging hole is incorrect, or the punching is not in place, the detection needle 58 cannot pass smoothly. As the movable block 52 continues to move downward, the detection needle 58 will move upward relative to the detection needle vertical groove 57 due to the action of resistance until it touches the contact piece 55 located on the detection needle vertical groove 57. When the contact piece 55 contacts the top of the detection needle 58, the contact piece 55 can send an electrical signal to the controller to suspend the tapping process, thereby ensuring the product qualification rate and protecting the safety of the mold.

[0035] like Figure 4As shown, in the embodiment of the present invention, a transformer iron bridge screw hole automatic tapping progressive die is provided with a plurality of equal height sleeves 36 and springs 37 at the bottom of the tapping seat plate 33. The tapping seat plate 33 is used to float up and down; since the time required for the tapping process is longer than that required for the stamping process, the horizontal position of the tapping seat plate 33 can be raised by setting the equal height sleeves 36 and springs 37; then when the upper die frame 11 is pressed down and the mold is closed, the material strip is preferentially contacted with the tapping rod 31 of the tapping mechanism 3, and the tapping process begins; at this time, the flanging hole stamping mechanism and the forming mechanism have not started to work, and the upper die frame 11 still has a certain falling stroke, and the flanging hole stamping mechanism and the forming mechanism will contact the material strip; and after the upper die frame 11 is completely lowered and the mold is closed, all the processes are basically completed at the same time, and then the upper die frame 11 is lifted upward, the mold is opened, and each mechanism returns to the initial position.

[0036] like Figure 1-5 As shown, the present embodiment describes an automatic tapping progressive die for screw holes of a transformer iron bridge, wherein the flanging hole stamping mechanism comprises a left punch assembly (not shown), a left male clamping plate 22 arranged on an upper die frame 11, and a left lower template 23 arranged on the lower die frame 12; the left punch assembly is fixedly arranged on the left male clamping plate 22; the forming mechanism comprises a right punch assembly 41, a right male clamping plate 42 arranged on the upper die frame 11, and a right lower template 43 arranged on the lower die frame 12; the right punch assembly 41 is fixedly arranged on the right male clamping plate 42; the stripping mechanism comprises a left double-layer stripping plate 21 arranged below the left male clamping plate 22 and a right double-layer stripping plate 44 arranged below the right male clamping plate 42; the left double-layer stripping plate 21 is provided with a first opening (not shown) for the left punch assembly to pass through; the right double-layer stripping plate 44 is provided with a second opening (not shown) for the right punch assembly 41 to pass through.

[0037] Specifically, in the flanging hole punching mechanism, in the horizontal direction, the left male clamping plate 22, the left double-layer stripping plate 21, the material belt and the left lower template 23 are arranged in sequence, and the right male clamping plate 42, the right double-layer stripping plate 44, the material belt and the right lower template 43 in the forming mechanism are also arranged in sequence;

[0038] During operation, the downward pressure of the upper mold frame 11 causes the left punch assembly installed on the left male clamping plate 22 to fall down to close the mold with the lower mold plate 23. At this time, the required shape, such as the ear seat contour, the foot shape and the flanging hole, can be punched out on the material strip; and because the left punch assembly is inserted into the left double-layer stripping plate 21, after the flanging hole punching mechanism completes the initial stamping process, when the upper mold frame 11 rises to open the mold, the left double-layer stripping plate 21 separates the material strip from the left punch assembly, and the feeder drives the material strip to the next process; similarly, after the forming mechanism completes the final stamping and bending forming process, the right double-layer stripping plate 44 separates the material strip from the right punch assembly 41.

[0039] like Figure 7 As shown, in the embodiment of the present invention, the transformer iron bridge screw hole automatic tapping progressive die is provided with a flanging hole punch 25 on the left punch assembly; a hemispherical portion 251 is provided on the top of the flanging hole punch 25; and a conical portion 252 is provided on the top of the hemispherical portion 251. By re-arranging the hemispherical portion 251 and the conical portion 252, the end of the punched flanging hole has a transition arc, that is, a chamfer-like effect is obtained. It can be found through experiments that with the transition arc, the subsequent tapping process and the customer's screw installation process are smoother.

[0040] like Figure 7 As shown, in the transformer bridge screw hole automatic tapping progressive die described in this embodiment, the radius of the hemispherical part 251 is 1.70mm-1.90mm; the cone angle of the conical part 252 is 30 degrees. It is found through experiments that with the transition arc, the subsequent tapping process and the customer's screw installation process are smoother.

[0041] like Figure 5 As shown, the automatic tapping progressive die for the screw holes of the transformer iron bridge described in this embodiment, the molding mechanism also includes a dead point detection device; the dead point detection device includes an inductor 61, a sensor 62 and a fixing bracket 63; the inductor 61 is arranged on one side of the right double-layer stripping plate 44; the fixing bracket 63 is arranged on one side of the right lower template 43; and the fixing bracket 63 is located directly below the inductor 61; the sensor 62 is installed on the top of the fixing bracket 63; the lower edge of the inductor 61 is at the same horizontal position as the lower edge of the right double-layer stripping plate 44. It is used for dead point detection to protect the safety of the mold.

[0042] like Figure 3 As shown, in the transformer bridge screw hole automatic tapping progressive die described in this embodiment, the tapping seat plate 33 is also provided with a tapping detection device 7 for detecting the status of the tapping rod 31; the tapping detection device 7 is arranged below the tapping rod 31. It is used to detect the position where the tapping rod falls and judge whether the tapping is in place.

[0043] The above is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the protection scope of the patent application of the present invention.

Claims

1. A transformer iron bridge screw hole automatic tapping progressive die, characterized in that: It comprises an upper die frame (11), a lower die frame (12), a stripping mechanism and a main column (13) for positioning; the main column (13) is arranged between the upper die frame (11) and the lower die frame (12); A flanging hole punching mechanism for punching flanging holes on the material strip, a tapping mechanism (3) for tapping the flanging holes, and a forming mechanism for bending the material strip are sequentially arranged between the upper die frame (11) and the lower die frame (12); the stripping mechanism is used to separate the material strip from the flanging hole punching mechanism, the tapping mechanism (3) and the forming mechanism; The tapping mechanism (3) comprises a tapping rod (31) for tapping the flanging hole, a transmission device (32) for driving the tapping rod (31) to work, and a tapping seat plate (33) arranged on the lower die frame (12); The punching mechanism is set to have a sufficient width so that its width value satisfies a positive integer multiple of the step distance; when working, the material strip is sent to the mold entrance by the feeder in a stepping manner, and then the flanging hole punching mechanism performs a preliminary punching process on the material strip, including punching out the ear seat contour, the foot shape and the flanging hole of the iron bridge; then the tapping mechanism performs a tapping process on the flanging hole; then, the forming mechanism performs the final punching and bending forming process on the material strip; The transmission device (32) comprises a transmission gear assembly (321), a screw (322) for driving the transmission gear assembly (321) to work, an upper fixed seat (34) arranged on the upper mold frame (11), and a lower fixed seat (35) arranged on the tapping seat plate (33); The screw rod (322) is drivingly connected to the input end of the transmission gear assembly (321); the tapping rod (31) is installed at the output end of the transmission gear assembly (321); The transmission gear assembly (321) is fixedly arranged on the top of the lower fixing seat (35); One end of the screw rod (322) is rotatably connected to the upper fixed seat (34); the other end of the screw rod (322) is sequentially inserted into the transmission gear assembly (321) and the lower fixed seat (35); A plurality of gear groups connected to the screw rod (322) are arranged inside the transmission gear assembly (321); when the upper mold frame (11) is pressed downward, the screw rod (322) arranged on the upper fixed seat (34) is driven to rotate, and then the screw rod (322) drives the internal gear group of the transmission gear assembly (321) to rotate, and because the tapping rod (31) is installed at the output end of the transmission gear assembly (321), the tapping rod (31) is driven to perform a tapping process on the flanging hole; The transmission gear assembly (321) comprises a nut threadedly connected to the screw rod (322) and a gear set meshing with the nut; the gear set drives the tapping rod (31) to rotate; The gear set comprises a first gear, a second gear and a third gear, and the first gear, the second gear and the third gear are meshed with each other; a bearing is provided on the first gear, the nut is provided on the bearing, the tapping rod (31) is mounted on the third gear and is transmission-connected with the third gear, the screw rod (322) drives the first gear to rotate through the nut, and then drives the tapping rod (31) to perform the tapping process; A feeding detection device is also provided between the flanging hole punching mechanism and the tapping mechanism (3); The feeding detection device comprises a fixed block (51), a movable block (52), a cylinder (53), a push rod (54), a contact sheet (55) and a detection needle (58) for detecting the position of the flanging hole; The fixed block (51) is fixedly arranged on the tapping seat plate (33); the movable block (52) is slidably connected to the fixed block (51) in a vertical direction; A push rod vertical groove (56) is provided on one side of the movable block (52); a detection needle vertical groove (57) is provided on the other side of the movable block (52); One end of the push rod (54) is threadedly connected to the push rod vertical groove (56), and the other end of the push rod (54) is connected to the output end of the cylinder (53); The detection needle (58) is slidably connected to the detection needle vertical groove (57); and the bottom end of the detection needle (58) passes through the bottom end of the movable block (52); the contact piece (55) is arranged above the detection needle vertical groove (57); The contact piece (55) is electrically connected to a controller for controlling the operation of the upper mold frame (11) through a wire; The detection needle (58) is used to extend into the flange hole on the material strip to detect whether the position of the flange hole is normal; when in the initial position, the detection needle (58) is located at the bottom of the detection needle vertical groove (57) under the action of gravity. At this time, the top of the detection needle (58) does not contact the contact piece (55); when the position of the flange hole is normal, under the operation of the cylinder (53), the push rod (54) drives the movable block (52) to slide vertically downward on the fixed block (51), driving the detection needle (58) to slide downward. If the position of the flange hole is correct, Then the detection needle (58) will pass through the position of the flange hole without any obstacles; if the position of the flange hole is incorrect, or the punching is not in place, the detection needle (58) cannot pass smoothly. As the movable block (52) continues to move downward, the detection needle (58) will move upward relative to the detection needle vertical groove (57) due to the effect of resistance until it touches the contact piece (55) located on the detection needle vertical groove (57). When the contact piece (55) touches the top of the detection needle (58), the contact piece (55) can send an electrical signal to the controller to suspend the tapping process. The bottom of the tapping seat plate (33) is provided with a plurality of equal height sleeves (36) and springs (37) for allowing the tapping seat plate (33) to float up and down; the equal height sleeves (36) and springs (37) are provided to raise the horizontal position of the tapping seat plate (33); when the upper mold frame (11) is pressed down to close the mold, the material strip is preferentially contacted with the tapping rod (31) of the tapping mechanism (3) to start the tapping process; at this time, the flanging hole punching mechanism and the forming mechanism have not yet started to work, and the upper mold frame (11) still has a certain falling stroke, and the flanging hole punching mechanism and the forming mechanism will contact the material strip; and after the upper mold frame (11) is completely lowered to close the mold, all the processes are basically completed at the same time, and then the upper mold frame (11) is lifted upward to open the mold, and each mechanism returns to its initial position; The flanging hole punching mechanism comprises a left punch assembly, a left male clamping plate (22) arranged on an upper die frame (11), and a left lower template (23) arranged on the lower die frame (12); the left punch assembly is fixedly arranged on the left male clamping plate (22); The forming mechanism comprises a right punch assembly (41), a right male clamping plate (42) arranged on the upper die frame (11), and a right lower die plate (43) arranged on the lower die frame (12); the right punch assembly (41) is fixedly arranged on the right male clamping plate (42); The stripping mechanism comprises a left double-layer stripping plate (21) arranged below the left male clamping plate (22) and a right double-layer stripping plate (44) arranged below the right male clamping plate (42); The left double-layer stripping plate (21) is provided with a first opening for the left punch assembly to pass through; the right double-layer stripping plate (44) is provided with a second opening for the right punch assembly (41) to pass through; In the horizontal direction, the left male clamping plate (22), the left double-layer stripping plate (21), the material belt and the left lower template (23) are arranged in sequence, and the right male clamping plate (42), the right double-layer stripping plate (44), the material belt and the right lower template (43) in the forming mechanism are also arranged in sequence; During operation, the upper die frame (11) is pressed downward to cause the left punch assembly mounted on the left male clamping plate (22) to fall down to close the mold with the left lower template (23), at which time the required shape can be punched out on the material strip; and because the left punch assembly is inserted into the left double-layer stripping plate (21), after the flanging hole punching mechanism completes the initial punching process, when the upper die frame (11) rises to open the mold, the left double-layer stripping plate (21) separates the material strip from the left punch assembly, and the feeder drives the material strip to the next process; similarly, after the molding mechanism completes the final punching and bending molding process, the right double-layer stripping plate (44) separates the material strip from the right punch assembly (41); The left punch assembly is provided with a flanging hole punch (25); a hemispherical portion (251) is provided at the top of the flanging hole punch (25); a conical portion (252) is provided at the top of the hemispherical portion (251); the radius of the hemispherical portion (251) is 1.70 mm-1.90 mm; the cone angle of the conical portion (252) is 30 degrees; The forming mechanism also includes a dead point detection device; The dead point detection device comprises an induction body (61), a sensor (62) and a fixing bracket (63); The induction body (61) is arranged on one side of the right double-layer stripping plate (44); the fixing frame (63) is arranged on one side of the right lower template (43); and the fixing frame (63) is located directly below the induction body (61); the sensor (62) is installed on the top of the fixing frame (63); The lower edge of the induction body (61) and the lower edge of the right double-layer stripping plate (44) are at the same horizontal position.

2. The transformer bridge screw hole automatic tapping progressive die according to claim 1, characterized in that: The tapping seat plate (33) is also provided with a tapping detection device (7) for detecting the condition of the tapping rod (31); the tapping detection device (7) is arranged below the tapping rod (31).

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