CN112828132B

CN112828132B - High-precision pipe symmetrical Kong Bianjie punching die

Info

Publication number: CN112828132B
Application number: CN202011553422.3A
Authority: CN
Inventors: 黄军忠
Original assignee: Kaiping Chengruifeng Technology Co ltd
Current assignee: Kaiping Chengruifeng Technology Co ltd
Priority date: 2020-12-24
Filing date: 2020-12-24
Publication date: 2023-06-27
Anticipated expiration: 2040-12-24
Also published as: CN112828132A

Abstract

The invention discloses a high-precision pipe symmetrical Kong Bianjie punching die which comprises an upper die and a lower die, wherein the upper die comprises an upper die holder, an upper clamping plate, an upper stop plate and a first stripper plate which are sequentially arranged from top to bottom, a plurality of first springs which vertically extend are arranged between the upper die holder and the upper stop plate, and an upper punch is fixed on the upper clamping plate; the lower die comprises a base, a lower die seat, a lower clamping plate, a lower stop baffle and a second stripper plate are sequentially arranged on the base from bottom to top, a plurality of second springs which vertically extend are arranged between the lower die seat and the lower stop plate, and a lower punch is fixed on the lower clamping plate corresponding to the upper punch; a first open slot is formed in the first stripping plate along the length extension direction of the first stripping plate, and a second open slot is formed in the second stripping plate corresponding to the first open slot; and a die core is arranged in the second open slot, punch through holes are formed in the die core corresponding to the upper punch and the lower punch, and the die core is sleeved with a pipe to be punched. The invention adopts an upper and lower punching structure, reduces the stroke of the die and improves the production efficiency.

Description

High-precision pipe symmetrical Kong Bianjie punching die

Technical Field

The invention relates to the technical field of dies, in particular to a high-precision die-cutting die for symmetric Kong Bianjie pipes.

Background

In the processing and manufacturing of tubular parts, a long tube blank is firstly cut into a fixed long tube blank, and then the fixed long tube blank is processed such as bending, flaring, necking, tube expansion, punching and the like, so that the tubular parts are processed by a common stamping processing method. Symmetrical hole blanking in tube forming is a time and labor consuming process. In the prior art, the punching symmetrical holes are punched downwards from the upper die to the bottom, the die stroke is very high, the punch is easy to break, the die maintenance frequency is high, and the production efficiency is low; meanwhile, a large number of burrs are reserved at the bottom of the pipe, the pipe needs to be polished again, labor is consumed, the production progress is affected, and the production cost is increased. Secondly, some factories adopt manual cutting to punch symmetrical holes of the pipe, so that the operation efficiency is low, the technical requirements on workers are high, the flatness and smoothness of the cut of the pipe are greatly influenced by human factors, and the accuracy of product cutting is difficult to ensure. Therefore, the existing die for punching symmetrical holes of the pipe is necessary to be improved, the problem that the upper die is directly punched downwards to the bottom is solved, the die stroke is reduced, the punching time is saved, and the pipe punching quality and efficiency are improved.

Disclosure of Invention

The technical problem solved by the invention is to provide the high-precision pipe symmetrical Kong Bianjie punching die, and the upper and lower punching structure is adopted, so that the die stroke is reduced, the production efficiency and the product quality are improved, and the cost is saved.

The technical scheme of the invention is as follows:

a high-precision pipe symmetrical Kong Bianjie punching die, which comprises an upper die and a lower die, wherein the upper die is arranged above the lower die;

the upper die comprises an upper die seat, an upper clamping plate, an upper stop plate and a first stripping plate which are sequentially arranged from top to bottom, the bottom surface of the upper die seat is fixedly provided with the upper clamping plate, the lower surface of the upper clamping plate is provided with the upper stop plate at intervals of a first movable distance, the lower surface of the upper stop plate is fixedly provided with the first stripping plate, a plurality of first springs which vertically extend are arranged between the upper die seat and the upper stop plate, and the upper clamping plate is provided with first spring holes allowing the first springs to pass through; an upper punch is fixed on the upper clamping plate, and upper punch holes allowing the upper punch to pass through are formed in the upper stop plate and the first stripper plate;

the lower die comprises a base, and a lower die base, a lower clamping plate, a lower stop baffle and a second stripper plate are sequentially arranged on the base from bottom to top; the lower die holder is fixedly provided with a lower clamping plate, the upper surface of the lower clamping plate is provided with a lower stop plate at a second movable distance, the lower stop plate is fixedly provided with a second stripper plate, a plurality of second springs extending vertically are arranged between the lower die holder and the lower stop plate, and the lower clamping plate is provided with second spring holes allowing the second springs to pass through; a lower punch is fixed on the lower clamping plate corresponding to the upper punch, and lower punch holes allowing the lower punch to pass through are formed in the lower stop plate and the second stripper plate;

a first open slot is formed in the first stripping plate along the length extension direction of the first stripping plate, and a second open slot is formed in the second stripping plate corresponding to the first open slot; a die core is arranged in the second open slot, punch through holes are formed in the die core corresponding to the upper punch and the lower punch, and a pipe to be punched is sleeved outside the die core; the first stripper plate moves downwards to cover the second stripper plate, and the first open slot and the second open slot are combined to form a fixed slot for clamping the pipe to be punched;

the first movable distance is equal to the second movable distance.

From the above description, it is clear that the following effects can be achieved in comparison with the prior art:

according to the high-precision pipe symmetrical Kong Bianjie punching die, the upper punch and the lower punch are simultaneously punched to form symmetrical holes by adopting the upper punching structure and the lower punching structure, so that the original mode of directly punching the symmetrical holes downwards from the upper die to the bottom is solved, the problems of high die stroke and easy breakage of the punch are avoided, the die stroke is greatly reduced, the punching life of the punch is prolonged, and the production efficiency and the product quality are improved; meanwhile, the upper and lower punching holes are adopted for punching, burrs on the periphery of the punching holes are reduced, the burrs do not need to be polished, the production time is saved, and the production efficiency is improved.

Drawings

FIG. 1 is a schematic diagram of a front view of a preferred embodiment of a high precision tubing symmetric Kong Bianjie blanking die of the present invention;

FIG. 2 is a schematic top view of a lower die of a preferred embodiment of the high precision tubing symmetric Kong Bianjie blanking die of the present invention;

FIG. 3 is a right side view of a preferred embodiment of the high precision tubing symmetrical Kong Bianjie blanking die of the present invention;

FIG. 4 is a schematic diagram of a structure in which the upper die of the preferred embodiment of the high-precision tubing symmetrical Kong Bianjie blanking die of the present invention is provided with vent lines;

FIG. 5 is a schematic diagram of a cross-sectional structure of the punch end of the punch of the preferred embodiment of the high precision tubing symmetrical Kong Bianjie blanking die of the present invention;

fig. 6 is a schematic diagram of a cross-sectional structure of the punch end of the punch of the preferred embodiment of the high-precision tubing symmetrical Kong Bianjie blanking die of the present invention.

Reference numerals for main elements:

the invention comprises the following steps:

1: upper die 11: upper die holder 12: upper clamping plate

121: upper punch 13: upper stopper plate 14: first stripper plate

141: first open slot 15: the first spring 2: lower die

21: base 22: lower die holder 23: lower clamping plate

231: lower punch 24: lower stop plate 25: second stripper plate

251: second open slot 26: second spring 3: material removing mechanism

31: the lower backing plate 32: third stripper plate 33: third spring

34: positioning rod 35: pushing assembly 351: pushing rod

352: top plate 353: liftout cylinder 354: cylinder backing plate

4: mold core 41: nesting section 411: circular arc chamfering structure

412: punch through hole 42: fixing section 5: waste blowing air pipe

6: blowing through hole 7: tube 8: side air jet hole

91: air guide passage 92: an external air source pipeline 93: air supply channel

94: side air injection channel

Detailed Description

For a clearer understanding of technical features, objects, and effects of the present invention, a specific embodiment of the present invention will be described with reference to the accompanying drawings.

The invention provides a high-precision pipe symmetrical Kong Bianjie punching die, which adopts an upper punching structure and a lower punching structure, reduces the stroke of the die, improves the production efficiency and the product quality, and saves the cost. In a preferred embodiment of the high-precision pipe symmetrical Kong Bianjie punching die, please refer to fig. 1 to 3, which are schematic structural diagrams of a preferred embodiment of the high-precision pipe symmetrical Kong Bianjie punching die of the present invention, the high-precision pipe symmetrical Kong Bianjie punching die comprises an upper die 1 and a lower die 2, wherein the upper die 1 is arranged above the lower die 2; the upper die 1 comprises an upper die holder 11, an upper clamping plate 12, an upper stop plate 13 and a first stripper plate 14 which are sequentially arranged from top to bottom, wherein the upper clamping plate 12 is fixed on the bottom surface of the upper die holder 11, the upper stop plate 13 is arranged on the lower surface of the upper clamping plate 12 at intervals of a first movable distance, the first stripper plate 14 is fixed on the lower surface of the upper stop plate 13, a plurality of first springs 15 which vertically extend are arranged between the upper die holder 11 and the upper stop plate 13, and first spring holes allowing the first springs 15 to pass through are formed in the upper clamping plate 12; an upper punch 121 is fixed on the upper clamping plate 12, and upper punch holes allowing the upper punch 121 to pass through are formed in the upper stop plate 13 and the first stripper plate 14; the lower die 2 comprises a base 21, wherein a lower die holder 22, a lower clamping plate 23, a lower stop plate 24 and a second stripper plate 25 are sequentially arranged on the base 21 from bottom to top; the lower die holder 22 is fixed with the lower clamping plate 23, the lower stop plate 24 is arranged on the upper surface of the lower clamping plate 23 at a second movable distance, the second stripper plate 25 is fixed on the lower stop plate 24, a plurality of second springs 26 extending vertically are arranged between the lower die holder 22 and the lower stop plate 24, and a second spring hole allowing the second springs 26 to pass through is arranged on the lower clamping plate 23; a lower punch 231 is fixed on the lower clamping plate 23 corresponding to the upper punch 121, and lower punch holes allowing the lower punch 231 to pass through are formed in the lower stop plate 24 and the second stripper plate 25; a first open slot 141 is formed in the first stripper plate 14 along the extending direction of the length of the first stripper plate 14, and a second open slot 251 is formed in the second stripper plate 25 corresponding to the first open slot 141; a die core 4 is installed in the second open slot 251, a punch through hole 412 is formed in the die core 4 corresponding to the upper punch 121 and the lower punch 231, and a pipe 7 to be punched is sleeved outside the die core 4; the first stripper plate 14 moves downwards to cover the second stripper plate 25, and the first open slot 141 and the second open slot 251 are combined to form a fixed slot for clamping the pipe 7 to be punched; the first movable distance is equal to the second movable distance. As shown in fig. 1 to 3, the upper die of the high-precision pipe symmetrical Kong Bianjie punching die comprises an upper die holder 11, an upper clamping plate 12, an upper stop plate 13 and a first stripper plate 14 which are sequentially arranged from top to bottom, wherein a plurality of first springs 15 are arranged between the upper die holder 11 and the upper stop plate 13, a lower die 2 is arranged on a base 21, a lower die holder 22, a lower clamping plate 23, a lower stop plate 24 and a second stripper plate 25 are sequentially arranged on the base 21 from bottom to top, a plurality of second springs 26 are arranged between the lower die holder 22 and the lower stop plate 24, a die core 4 is arranged in a second open slot 251 arranged on the second stripper plate 25, and a pipe 7 to be punched is sleeved outside the die core 4; when stamping starts, the upper die 1 moves downwards until the first stripper plate 14 covers the second stripper plate 25, the first stripper plate 14 is provided with a second open slot 251 matched with the first open slot 141, the first open slot 141 and the second open slot 251 are combined to form a fixed slot for clamping the pipe 7 to be punched, in the process that the upper die 1 continues to be pressed downwards, an upper punch 121 fixedly arranged on the upper clamping plate 12 passes through an upper punch hole to abut against the upper side wall of the pipe 7 to be stamped, meanwhile, a lower punch 231 on the lower clamping plate 23 passes through a lower punch hole to abut against the lower side wall of the pipe 7 to be stamped, the first stripper plate 14 continues to press the second stripper plate 25, and the upper punch 121 and the lower punch 231 respectively pass through punch through holes 412 on the die core 4 to form symmetrical holes in the pipe 7; according to the high-precision pipe symmetrical Kong Bianjie punching die, the upper punch 121 and the lower punch 231 are punched simultaneously to form symmetrical holes by adopting the upper and lower punching structures on the upper die 1 and the lower die 2, so that the original mode of directly punching the symmetrical holes downwards by the upper die 1 is solved, the problems of high die stroke and easiness in breakage of the punches are avoided, the die stroke is greatly reduced, the punching life of the punches is prolonged, and the production efficiency and the product quality are improved; meanwhile, the upper and lower punching holes are adopted for punching, burrs on the periphery of the punching holes are reduced, the burrs do not need to be polished, the production time is saved, and the production efficiency is improved.

In the preferred embodiment of the high-precision pipe symmetrical Kong Bianjie punching die disclosed by the invention, the material removing mechanism 3 is arranged on the outer side of the second material removing plate 25; the mold core 4 comprises a nesting section 41 and a fixing section 42, wherein the nesting section 41 and the fixing section 42 are coaxially arranged; the fixed section 42 extends to the outer side of the second stripping plate 25 and is inserted into the stripping mechanism 3; the material removing mechanism 3 comprises a lower base plate 31 and a third material removing plate 32, wherein the lower surface of the lower base plate 31 is arranged on the lower clamping plate 23 at a third movable distance, the third material removing plate 32 is fixed on the lower base plate 31, a plurality of third springs 33 which vertically extend are arranged between the lower die holder 22 and the lower base plate 31, and third spring holes allowing the third springs 33 to pass through are arranged on the lower clamping plate 23; the third stripper plate 32 is provided with a mold core through groove, and the fixed section 42 is inserted into and penetrates through the mold core through groove; the distance between the central axis of the die core 4 and the lowest position of the second open groove 251 is greater than the distance between the central axis of the die core 4 and the lowest position of the outer side wall of the pipe 7 to be punched; the sum of the lengths of the third stripper plate 32 and the first stripper plate 14 is equal to or less than the length of the upper stop plate 13, and the vertical distance between the lower surface of the upper stop plate 13 and the highest position of the first open slot 141 is equal to the vertical distance between the upper surface of the third stripper plate 32 and the highest position of the outer side wall of the pipe 7 to be punched. As shown in fig. 1 and 2, a stripping mechanism 3 is arranged at the outer side of a second stripping plate 25 of the present invention, the stripping mechanism 3 comprises a lower base plate 31 and a third stripping plate 32, the lower base plate 31 is arranged on a lower clamping plate 23, a third spring 33 is arranged between the lower base plate 31 and a lower die holder 22, and the third stripping plate 32 is arranged on the lower base plate 31; the mold core 4 comprises a nesting section 41 and a fixing section 42, wherein the fixing section 42 extends to the outer side of the second stripping plate 25 and is inserted into a mold core through groove arranged on the third stripping plate 32; when the upper die 1 punches downwards, the upper stop plate 13 presses the third stripper plate 32 first, at this time, the first stripper plate 14 just covers the second stripper plate 25, then the first stripper plate 14 and the second stripper plate 25 move downwards simultaneously, and the upper punch 121 and the lower punch 231 punch holes simultaneously; after the stamping is finished, the upper die 1 is retracted and separated from the lower die 2, the compressed second spring 26 and third spring 33 extend to restore to the original compressed length, and the distance between the central axis of the die core 4 and the lowest position of the second open slot 251 is greater than the distance between the central axis of the die core 4 and the lowest position of the outer side wall of the pipe 7 to be stamped, so that the outer side wall of the pipe 7 is separated from the bottom of the second open slot 251 after the stamping is finished, and the stamped pipe 7 is conveniently taken out of the second open slot 251.

The high-precision pipe symmetrical Kong Bianjie punching die disclosed by the invention has the advantages that in the preferred embodiment, the stripping mechanism 3 comprises a pushing assembly 35, and the pushing assembly 35 comprises a pushing rod 351, a top plate 352 and a driving mechanism; the third stripper plate 32 is provided with a push rod through hole penetrating through the third stripper plate 32 along the length direction of the fixed section 42, the push rod through hole is internally provided with the push rod 351, the length of the push rod 351 is larger than that of the push rod through hole, the first end of the push rod 351 corresponds to the pipe wall of the pipe 7 to be punched, the second end of the push rod 351 extends out of the push rod through hole, and the distance between the inner side surface of the push rod 351 and the central shaft of the mold core 4 is larger than or equal to the distance between the outer side wall of the jacket section 41 and the central shaft of the mold core 4; the driving mechanism is arranged on the outer side of the second end of the pushing rod 351, the top plate 352 is connected to the tail end of the output rod of the driving mechanism, and the top plate 352 is arranged towards the pushing rod 351; the drive mechanism drives the top plate 352 to move against the second end of the ejector rod 351, the first end of the ejector rod 351 pushing the punched tubing 7 forward out of the second open slot 251. As shown in fig. 1 to 2, the stripping mechanism 3 of the present invention further includes a pushing assembly 35, where the pushing assembly 35 includes a pushing rod 351 disposed in a push rod through hole of the third stripping plate 32, a driving mechanism, and a top plate 352 fixed on an output rod of the driving mechanism, when the upper die 1 is lifted up after stamping is completed, the driving mechanism pushes the top plate 352 to push the pushing rod 351, and then the tube 7 is pushed by the pushing rod 351, so as to facilitate taking out the punched tube 7; and the distance between the inner side surface of the pushing rod 351, which is close to the die core 4, and the central axis of the die core 4 is larger than the distance between the outermost end of the outer side wall of the jacking section 41 and the central axis of the die core 4, so that the pushing rod 351 can not collide with the jacking section 41 in the process of pushing the pipe 7 to move, and the smooth pushing process is ensured.

In the preferred embodiment of the high-precision die-cutting die for pipe symmetry Kong Bianjie of the present invention, a positioning rod 34 in a vertical direction is disposed on the lower backing plate 31 corresponding to the first end of the pipe 7 to be punched, positioning through holes are disposed on the third stripper plate 32 and the fixing section 42, and the upper end of the positioning rod 34 passes through the positioning through holes. As shown in fig. 1 and 2, the mold core 4 of the present invention is mounted in the second open slot 251, and after the fixing section 42 is fixed in the mold core through slot, the positioning rod 34 is inserted into the positioning through holes provided on the third stripper plate 32 and the fixing section 42 from the bottom of the third stripper plate 32, and the lower end of the positioning rod 34 abuts against the upper surface of the lower pad 31; by arranging the positioning rod 34, the die core 4 is further fixed, and the die core 4 cannot move back and forth in the stamping process, so that the precision of punching holes is ensured; and in the process of sleeving the pipe 7 and taking off the pipe 7 for many times, the position of the mold core 4 cannot be randomly shifted, the position of the mold core 4 does not need to be corrected once in the process of assembling and disassembling the pipe 7, the time is saved, the punching efficiency is improved, and the punching precision can be ensured.

The high-precision pipe symmetrical Kong Bianjie punching die of the invention as described above, in the preferred embodiment, the cross-section of the jacket segment 41 has a larger size than the cross-section of the fixed segment 42; the tail end of the nesting section 41 is provided with an arc chamfer structure 411; at least two push rod through holes are formed in the third stripper plate 32, and the push rod 351 is inserted into each push rod through hole; the driving mechanism is a jacking air cylinder 353, an air cylinder base plate 354 is arranged on the base, and the jacking air cylinder 353 is arranged on the air cylinder base plate. As shown in fig. 1 and 2, the cross section of the nesting section 41 of the present invention is larger than the cross section of the fixing section 42, and the fixing section 42 has a small cross section in the process of filling the die core 4, so that the nesting section is convenient to be inserted into the second open slot 251; the cross section of the fixed section 42 is small, so that a gap distance is reserved between the inner side surface of the pushing rod 351 and the fixed section 42, friction with the fixed section 42 in the pushing process of the pushing rod 351 is avoided, power waste of the driving mechanism is caused, and the service life of the driving mechanism is prolonged; the tail end of the nesting section 41 is provided with the arc chamfer structure 411, so that the pipe 7 to be punched is conveniently sleeved on the die core 4; at least two push rods are arranged on the third stripping plate 32 and pass through, pushing rods 351 are arranged in the through holes of the push rods, and the pipe 7 is pushed by the plurality of pushing rods 351, so that the stress is more uniform, and the pipe 7 is easy to push out; the driving mechanism of the invention is the ejection cylinder 353, the piston rod of the ejection cylinder 353 is connected with the top plate 352, the ejection cylinder 353 has simple structure, easy installation and maintenance and low cost, and simultaneously, the output force is larger, thereby being capable of meeting the power requirement of the pushing component 35 and meeting the stroke required by the movement of the pushing rod 351.

In the preferred embodiment of the high-precision die-cutting die for pipe symmetry Kong Bianjie of the present invention, the high-precision die-cutting die for pipe symmetry Kong Bianjie of the present invention, in the preferred embodiment of the present invention, the die core 4 has a hollow structure, and a waste-blowing air pipe 5 is disposed at the end pipe orifice of the fixing section 42, and the waste-blowing air pipe 5 is connected with an air source. As shown in fig. 2, a waste material blowing pipe 5 arranged at the end pipe orifice of the fixing section 42 blows out waste material pieces in a hollow channel of the mold core 4, and the waste material pieces in the mold core are cleaned in time, so that excessive waste material pieces are prevented from being remained, and the subsequent punching process is prevented from being influenced; further, a waste collecting device is arranged at the tail end of the nesting section 41, blown waste sheets directly fall into the waste collecting device, the waste sheets are prevented from scattering around and falling into gaps on the bottom surface, the cleaning difficulty is increased, and the working environment is also influenced.

In the above-mentioned high-precision die-cutting die for tubing symmetric Kong Bianjie of the present invention, in a preferred embodiment, the upper punch 121 and the lower punch 231 are each provided with an air blowing through hole 6 penetrating through the upper end and the lower end thereof in the axis parallel direction, the upper die holder 11 and the lower die holder 22 are each provided with an air guide channel 91, one end of the air guide channel 91 is communicated with the air blowing through hole 6, and the other end is connected with an external air source pipeline 92. As shown in fig. 4 to 6, the air blowing through holes 6 on the upper punch 121 and the lower punch 231 of the present invention are channels located in the punches, the air guiding channels 91 are channels located on the upper die holder 11 and the lower die holder 22, and after the two channels are communicated, a complete air blowing channel is formed, high-pressure air is inflated through an external air source, and the air can be ejected from the ends of the punches along the air guiding channels 91 to the air blowing through holes 6. In the preferred working process, when stamping is completed, the upper punch 121 and the lower punch 231 respectively withdraw from the punch through hole 412, and when the upper punch 121 is just at the position separated from the pipe punching, an external air source is started, air flows into each blowing through hole 6 through the external air source pipeline 92 and the air guide channel 91, the air flows are ejected after flowing to the stamping ends of the upper punch 121 and the lower punch 231, the ejected air flows push the waste pieces generated after punching into the pipe 7 and the mold core 4, and due to the effect of the air flow ejected by the upper punch 231 and the lower punch 231, the waste pieces in the mold core 4 have the effect of being similar to suspension in the inner pipe cavity of the mold core 4, and meanwhile, the waste pieces ejected by the waste blowing pipe 5 are blown out from one end to the other end of the inner pipe cavity of the mold core 4, so that the waste pieces generated after pipe punching can be cleaned more thoroughly and completely, and especially, the waste pieces are prevented from being blocked in the mold core 4 or the through hole 412 of the pipe 7, the situation that the ejected waste pieces are difficult to be ejected from the inside the mold core 4 is even blocked, the waste pieces are prevented from being ejected from the inside the mold core 4 is solved, the problem that the waste pieces are difficult to be ejected from the inside the mold core 4 is reduced, the labor cost is reduced, the waste pieces are required to be cleaned in the hole 412 and/is required to be cleaned, and the work cost is reduced; furthermore, the air ducts are arranged in the air blowing through holes 6 and the air duct 91, and a completely sealed air blowing passage is formed through the mutually connected air ducts, so that the possibility of air leakage is reduced, the strength of air flow is improved, and the waste chips in the mold core 4 can be blown out more quickly and thoroughly; of course, it is also possible to achieve a corresponding sealing effect by providing rubber rings at the respective channels. The upper die holder 11 and the lower die holder 22 of the invention can be provided with an air guide channel 91 which is communicated with an external air source corresponding to each air blowing through hole 6, or the air guide channels 91 which are communicated with the external air source are arranged after the air blowing through holes 6 on the upper die holder 11 and the lower die holder 22 are respectively communicated, so that the air blowing device can be reasonably arranged according to actual needs.

In the high-precision pipe symmetrical Kong Bianjie punching die according to the present invention, in the preferred embodiment, the air guide passage 91 is connected to the air blowing through hole 6 of the first lower punch 231 near the end nozzle of the fixed section 42, and the air guide passage 91 is connected to the external air source pipe 92; an air supply channel 93 is formed in the lower clamping plate 23 between the lower ends of the adjacent lower punches 231, and the air supply channel 93 is communicated with the air supply through holes 6 of the lower punches 231; the air guide channel 91 is connected to the air blowing through hole 6 of the first upper punch 121 near the end pipe orifice of the fixed section 42, and the air guide channel 91 is communicated with the external air source pipeline 92; the air supply passages 93 are formed in the upper clamping plate 12 between the upper ends of the adjacent upper punches 121, and the air supply passages 93 communicate with the air supply through holes 6 of the upper punches 121. As shown in fig. 4, in the present invention, at the air blowing through hole 6 of the first lower punch 231 near the end nozzle of the fixing section 42 on the lower die holder 22, an air guiding channel 91 communicating with the air blowing through hole 6 is provided, and the lower clamping plate 23 between the lower ends of each adjacent lower punch 231 is provided with an air supplying channel 93 communicating with the air blowing through hole 6 of each lower punch 231, and a complete air blowing channel is formed among the air guiding channel 91, the air supplying channel 93 and the air blowing through hole 6; after the external air source is started, the air flow flows to the air guide channel 91 through the external air source pipeline 92, then at the tail end of the air guide channel 91, the air flow is divided into two paths, one path of air flow flows to the air blowing through hole 6 of the first lower punch 231, the other path of air flow flows to the next lower punch 231 through the air supply channel 93, and the air is sequentially conveyed to the subsequent lower punch 231 from the next lower punch 231, so that the effect that a plurality of punches jet the air simultaneously is achieved in a short time, and the air guide channel 91 for connecting the external air source is not required to be arranged at the fixed end of each punch. When the air source blows the scrap pieces, the air flows into the air blowing through holes 6 of the lower punch 231 close to one side of the fixed section 42, then flows to the air blowing through holes 6 of the lower punch 231 far away from the fixed section 42 sequentially through the air supply channel 93, and is consistent with the air flow direction in the air blowing exhaust pipe, the air flows and is reinforced from the side of the near fixed section 42 to the side far away from the fixed section 42, so that the scrap pieces closer to the side of the fixed section 42 are blown into the inner cavity of the mold core 4 from the punch through holes 412, and the air flow in the air blowing exhaust pipe can be better collected and blown out of the inner cavity of the mold core 4 according to the blowing sequence, and the scrap pieces are discharged outwards; the air guide channel 91, the air supply channel 93 and the air blowing through hole 6 arranged on the upper punch 121 can also form a complete air blowing passage together with the lower punch 231, so as to achieve the air injection effect matched with the lower punch 231, and have the effect of pushing the scrap pieces into the inner cavity of the mold core 4 and smoothly out of the mold core 4.

In the above-mentioned high-precision pipe symmetrical Kong Bianjie punching die, in a preferred embodiment, as shown in fig. 5, a plurality of side air injection holes 8 are formed at one side of the upper end portion of each lower punch 231, which is close to the fixed section 42; a plurality of side air injection holes 8 are formed in the lower end portion of each upper punch 121 near one side of the fixed section 42. According to the invention, the side air injection holes 8 are formed in one side, close to the fixed section 42, of the upper end part of the lower punch 231, and when the waste sheet is acted by the upward blowing force of the air in the air injection through holes 6 and the side air injection holes 8, the upward thrust force of one side, close to the fixed section 42, of the waste sheet is larger, in the process of entering the inner cavity of the die core 4, and the blowing force of the air in the side air injection holes 8, which are positioned at one side of the air injection through holes 6 at the tail end of the punch, deflects towards the opening direction of the other side of the die core 4, so that the trend of moving towards the other end of the inner cavity of the die core 4 is formed, and the waste sheet is blown out of the inner cavity of the die core 4 due to the outward blowing force of the air in the air exhaust pipe along the central axis direction of the die core 4, so that the efficiency of blowing the waste sheet is further improved. The side air jet holes 8 are formed in the side, close to the fixed section 42, of the lower end portion of the upper punch 121, so that the scrap pieces can be blown out, and the scrap piece cleaning efficiency is improved. Further, as shown in fig. 6, each of the side air injection through holes communicates to form an arc-shaped side air injection passage 94. Further, a nozzle may be installed in the air blowing through hole 6 at the upper end of the lower punch 231 and the air blowing through hole 6 at the lower end of the upper punch 121, the nozzle includes a middle air blowing hole and a side air blowing hole 8 at the side, and after the air flows into the air blowing through hole, a plurality of air flows are blown out through the nozzle, so that the above-mentioned waste sheet is simultaneously subjected to the upward blowing force of the air in the air blowing through hole 6 and the side air blowing hole 8.

In another preferred embodiment of the high-precision pipe symmetrical Kong Bianjie punching die disclosed by the invention, the positioning through hole on the fixing section 42 is a positioning through groove extending along the radial direction of the positioning through groove, the circular arc angle of the positioning through groove is 90 degrees, and the positioning through groove is used for accommodating the positioning rod 34 when the mold core 4 rotates; the tail end of the fixed section 42 is provided with a rotating motor, and the rotating shaft of the rotating motor is connected with the tail end of the mold core 4; at the beginning of punching, the punch through hole 412 is aligned with the upper punch 121 and the lower punch 231, and one end of the positioning rod 34 is positioned in the positioning through groove; after the punching is completed, the upper punch 121 and the lower punch 231 are withdrawn from the punch through hole 412, the rotating motor drives the die core 4 to rotate 90 °, the positioning rod 34 rotates to the other end of the positioning through groove, at this time, the punch through hole 412 of the die core 4 rotates to a horizontal position, and the pipe 7 rotates 90 ° together with the die core 4. The positioning through holes on the fixing section 42 are arranged into the positioning through grooves which are rotated around the circle center for 90 degrees on the cross section of the positioning through grooves, and the cross section of the positioning through grooves is in two fan-shaped shapes which are symmetrical around the circle center, so that the positioning rod 34 can be avoided in the positioning through grooves in the rotating process of the mold core 4, and the mold core 4 is not blocked from rotating. At the beginning of stamping, symmetrical punch through holes 412 on the die core 4 are aligned with the upper punch 121 and the lower punch 231 respectively, and one end of the positioning rod 34 positioned in the positioning through groove; after the punching is completed, the upper punch 121 and the lower punch 231 are withdrawn from the punch through hole 412, and then the rotating motor is started, so that the die core 4 rotates by 90 degrees, and in the rotating process, the scrap pieces clamped in the pipe punching and/or the punch through hole 412 can fall out when rotating; after the rotation is finished, the bottom of the inner cavity of the mold core 4 is a continuous groove body, so that the waste chips can not fall into the punch through holes 412 due to the action of gravity any more, the waste chips are conveniently blown out by the blowing exhaust pipe along the inner cavity of the mold core 4, the situation that the waste chips are clamped between the pipe punching and the punch through holes 412 and the pipe 7 is difficult to take out is reduced; the arc angle of the positioning through groove is set to 90 degrees, the operation is simpler and more convenient, and the positioning rod 34 is positioned at one end of the positioning through groove when the positioning through groove rotates once; when the pipe 7 rotates 90 degrees along with the die core 4, the symmetrical punch through holes 412 are rotated to the horizontal position, and in the blowing process of the blowing exhaust pipe, the scrap pieces can be blown out from the horizontal punch through holes 412. Further, the receiving baffles are respectively arranged at the two side edges of the mold core 4, so that the waste chips blown out from the punch through holes 412 at the two sides fall into the receiving baffles and cannot fall around; preferably, the bottom surface of the receiving baffle is set to be inclined towards the tail end of the nesting section 41, so that the waste sheet can automatically slide to one end of the receiving baffle, and centralized cleaning is facilitated.

As described above, referring to fig. 1 to 3, the process and principle of the operation of the high-precision die-cutting die for pipe symmetry Kong Bianjie of the present invention will now be described by way of example with reference to the preferred embodiment, and the following details are given:

the upper die of the high-precision pipe symmetrical Kong Bianjie punching die comprises an upper die holder 11, an upper clamping plate 12, an upper stop plate 13 and a first stripper plate 14 which are sequentially arranged from top to bottom, wherein a plurality of first springs 15 are arranged between the upper die holder 11 and the upper stop plate 13, a lower die 2 is arranged on a base 21, a lower die holder 22, a lower clamping plate 23, a lower stop plate 24 and a second stripper plate 25 are sequentially arranged on the base 21 from bottom to top, a plurality of second springs 26 are arranged between the lower die holder 22 and the lower stop plate 24, a die core 4 is arranged in a second open slot 251 arranged on the second stripper plate 25, and a pipe 7 to be punched is sleeved outside the die core 4; when stamping starts, the upper die 1 moves downwards until the first stripper plate 14 covers the second stripper plate 25, the first stripper plate 14 is provided with a second open slot 251 matched with the first open slot 141, the first open slot 141 and the second open slot 251 are combined to form a fixed slot for clamping the pipe 7 to be punched, in the process that the upper die 1 continues to be pressed downwards, an upper punch 121 fixedly arranged on the upper clamping plate 12 passes through an upper punch hole to abut against the upper side wall of the pipe 7 to be stamped, meanwhile, a lower punch 231 on the lower clamping plate 23 passes through a lower punch hole to abut against the lower side wall of the pipe 7 to be stamped, the first stripper plate 14 continues to press the second stripper plate 25, and the upper punch 121 and the lower punch 231 respectively pass through punch through holes 412 on the die core 4 to form symmetrical holes in the pipe 7; according to the high-precision pipe symmetrical Kong Bianjie punching die, the upper punch 121 and the lower punch 231 are punched simultaneously to form symmetrical holes by adopting the upper and lower punching structures on the upper die 1 and the lower die 2, so that the original mode of directly punching the symmetrical holes downwards by the upper die 1 is solved, the problems of high die stroke and easiness in breakage of the punches are avoided, the die stroke is greatly reduced, the punching life of the punches is prolonged, and the production efficiency and the product quality are improved; meanwhile, the upper and lower punching holes are adopted for punching, burrs on the periphery of the punching holes are reduced, the burrs do not need to be polished, the production time is saved, and the production efficiency is improved. In a further embodiment, a stripping mechanism 3 is arranged at the outer side of the second stripping plate 25, the stripping mechanism 3 comprises a lower base plate 31 and a third stripping plate 32, the lower base plate 31 is arranged on the lower clamping plate 23, a third spring 33 is arranged between the lower base plate 31 and the lower die holder 22, and the third stripping plate 32 is arranged on the lower base plate 31; the mold core 4 comprises a nesting section 41 and a fixing section 42, wherein the fixing section 42 extends to the outer side of the second stripping plate 25 and is inserted into a mold core through groove arranged on the third stripping plate 32; when the upper die 1 punches downwards, the upper stop plate 13 presses the third stripper plate 32 first, at this time, the first stripper plate 14 just covers the second stripper plate 25, then the first stripper plate 14 and the second stripper plate 25 move downwards simultaneously, and the upper punch 121 and the lower punch 231 punch holes simultaneously; after the stamping is finished, the upper die 1 is retracted and separated from the lower die 2, the compressed second spring 26 and third spring 33 extend to restore to the original compressed length, and the distance between the central axis of the die core 4 and the lowest position of the second open slot 251 is greater than the distance between the central axis of the die core 4 and the lowest position of the outer side wall of the pipe 7 to be stamped, so that the outer side wall of the pipe 7 is separated from the bottom of the second open slot 251 after the stamping is finished, and the stamped pipe 7 is conveniently taken out of the second open slot 251. In a further embodiment, the stripping mechanism 3 of the present invention further comprises a pushing assembly 35, wherein the pushing assembly 35 comprises a pushing rod 351 arranged in a push rod through hole of the third stripping plate 32, a driving mechanism and a top plate 352 fixed on an output rod of the driving mechanism, when the upper die 1 is lifted up after stamping is completed, the driving mechanism pushes the top plate 352 to push the pushing rod 351, and then the tube 7 is pushed by the pushing rod 351, so that the punched tube 7 can be conveniently taken out; and the distance between the inner side surface of the pushing rod 351, which is close to the die core 4, and the central axis of the die core 4 is larger than the distance between the outermost end of the outer side wall of the jacking section 41 and the central axis of the die core 4, so that the pushing rod 351 can not collide with the jacking section 41 in the process of pushing the pipe 7 to move, and the smooth pushing process is ensured.

According to the high-precision pipe symmetrical Kong Bianjie punching die, the upper punch 121 and the lower punch 231 are punched simultaneously to form symmetrical holes by adopting the upper and lower punching structures on the upper die 1 and the lower die 2, so that the original mode of directly punching the symmetrical holes downwards by the upper die 1 is solved, the problems of high die stroke and easiness in breakage of the punches are avoided, the die stroke is greatly reduced, the punching life of the punches is prolonged, and the production efficiency and the product quality are improved; meanwhile, the upper and lower punching holes are adopted for punching, burrs on the periphery of the punching holes are reduced, the burrs do not need to be polished, the production time is saved, and the production efficiency is improved.

The foregoing is illustrative of the present invention and is not to be construed as limiting the scope of the invention. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this invention, and are intended to be within the scope of this invention.

Claims

1. The high-precision pipe symmetrical Kong Bianjie punching die is characterized by comprising an upper die and a lower die, wherein the upper die is arranged above the lower die;

the first movable distance is equal to the second movable distance;

the outer side of the second stripping plate is provided with a stripping mechanism; the mold core comprises a nesting section and a fixing section, wherein the nesting section and the fixing section are coaxially arranged; the fixed section extends to the outer side of the second stripping plate and is inserted into the stripping mechanism; the material removing mechanism comprises a lower base plate and a third material removing plate, wherein the lower surface of the lower base plate is arranged on the lower clamping plate at intervals of a third movable distance, the third material removing plate is fixed on the lower base plate, a plurality of third springs which vertically extend are arranged between the lower die holder and the lower base plate, and third spring holes allowing the third springs to pass through are formed in the lower clamping plate; the third stripper plate is provided with a mold core through groove, and the fixed section is inserted into and penetrates through the mold core through groove; the distance between the central axis of the die core and the lowest position of the second open groove is larger than the distance between the central axis of the die core and the lowest position of the outer side wall of the pipe to be punched; the sum of the lengths of the third stripper plate and the first stripper plate is equal to or smaller than the length of the upper stop plate, and the vertical distance between the lower surface of the upper stop plate and the highest position of the first open slot is equal to the vertical distance between the upper surface of the third stripper plate and the highest position of the outer side wall of the pipe to be punched;

the material removing mechanism comprises a material pushing assembly, wherein the material pushing assembly comprises a material pushing rod, a top plate and a driving mechanism; the third stripper plate is provided with a push rod through hole penetrating through the third stripper plate along the length direction of the fixed section, the push rod through hole is internally provided with the push rod, the length of the push rod is larger than that of the push rod through hole, the first end of the push rod corresponds to the pipe wall of the pipe to be punched, the second end of the push rod extends out of the push rod through hole, and the distance between the inner side surface of the push rod and the central shaft of the die core is larger than or equal to the distance between the outer side wall of the sleeve section and the central shaft of the die core; the driving mechanism is arranged on the outer side of the second end of the pushing rod, the tail end of the output rod of the driving mechanism is connected with the top plate, and the top plate is arranged towards the pushing rod; the driving mechanism drives the top plate to move to abut against the second end of the pushing rod, and the first end of the pushing rod pushes the punched pipe to move forwards to exit the second open slot;

a positioning rod in the vertical direction is arranged on the lower base plate corresponding to the first end of the pipe to be punched, positioning through holes are correspondingly arranged on the third stripper plate and the fixed section, and the upper end of the positioning rod penetrates through the positioning through holes;

the cross section of the nesting section is larger than that of the fixing section; the tail end of the jacking section is provided with an arc chamfer structure; the third stripping plate is provided with at least two push rod through holes, and the push rod through holes are respectively internally inserted with the push rod; the driving mechanism is a jacking air cylinder, an air cylinder base plate is arranged on the base, and the jacking air cylinder is arranged on the air cylinder base plate;

the mold core is of a hollow structure, a waste blowing air pipe is arranged at the pipe orifice of the tail end of the fixed section, and the waste blowing air pipe is connected with an external air source;

the upper punch and the lower punch are internally provided with air blowing through holes penetrating through the upper end and the lower end of the upper punch along the axis parallel direction, the upper die base and the lower die base are respectively provided with an air guide channel, one end of each air guide channel is communicated with the air blowing through hole, and the other end of each air guide channel is connected with an external air source pipeline;

the air guide channel is connected with an air blowing through hole of the first lower punch close to the end pipe orifice of the fixed section and is communicated with the external air source pipeline; an air supply channel is formed in the lower clamping plate between the lower ends of the adjacent lower punches, and the air supply channel is communicated with the air blowing through holes of the lower punches;

the air guide channel is connected with the air blowing through hole of the first upper punch, which is close to the end pipe orifice of the fixed section, and is communicated with the external air source pipeline; the upper clamping plates between the upper ends of the adjacent upper punches are provided with air supply channels which are communicated with the air supply through holes of the upper punches;

a plurality of side air injection holes are formed in one side, close to the fixed section, of the upper end part of each lower punch; and a plurality of side air injection holes are formed in one side, close to the fixed section, of the lower end part of each upper punch.

2. The high-precision pipe symmetrical Kong Bianjie punching die according to claim 1, wherein the positioning through hole on the fixing section is a positioning through groove extending along the radial direction of the fixing section, the circular arc angle of the positioning through groove is 90 degrees, and the positioning through groove is used for accommodating the positioning rod when the die core rotates; the tail end of the fixed section is provided with a rotating motor, and a rotating shaft of the rotating motor is connected with the tail end of the mold core; when stamping starts, the punch through hole corresponds to the upper punch and the lower punch, the positioning rod is located at one end of the positioning through groove, stamping is completed, after the upper punch and the lower punch exit from the punch through hole, the rotating motor drives the mold core to rotate by 90 degrees, and the positioning rod is located at the other end of the positioning through groove.