CN212469471U

CN212469471U - Negative clearance stamping die

Info

Publication number: CN212469471U
Application number: CN202021112180.XU
Authority: CN
Inventors: 钱忠
Original assignee: Dongguan Mingrui Precision Hardware Technology Co ltd
Current assignee: Dongguan Mingrui Precision Hardware Technology Co ltd
Priority date: 2020-06-16
Filing date: 2020-06-16
Publication date: 2021-02-05
Anticipated expiration: 2030-06-16

Abstract

The utility model discloses a negative clearance stamping die, which comprises an upper die and a lower die, wherein the upper die comprises an upper die base, an upper backing plate, an upper clamping plate, a stop plate and a stripper plate which are arranged from top to bottom in sequence; the lower die comprises a lower die plate, a lower backing plate and a lower die base which are arranged in sequence from top to bottom; the upper die also comprises a negative clearance insert and a mis-delivery detection device; the negative clearance insert is arranged in the middle of the stripper plate and is provided with a female die cavity similar to the shape of the workpiece; the mis-feeding detection device is arranged on the stripper plate and is used for detecting whether the strip feeding is mis-performed or not; the lower die also comprises a male die, a floating material guide pin and a return spring; the floating material guide pins sequentially penetrate through the lower template and the lower backing plate from top to bottom; the return spring is abutted between the lower die seat and the bottom of the buoyancy lifting material guide pin; the male die is arranged on the lower die plate, and the cross section area of the male die is larger than that of the cavity of the female die. The utility model has the advantages of punching press work piece does not have the burr.

Description

Negative clearance stamping die

Technical Field

The utility model belongs to the technical field of the mould technique and specifically relates to a negative clearance stamping die.

Background

In modern manufacturing industry, dies such as stamping dies, forging dies, die casting dies, etc. are one of the important tools for industrial production of various parts. In the stamping die, the burr is common technological defect on the work piece, and current stamping die generally all adopts modes such as press burr or later stage grinding to handle, and such processing mode directly leads to manufacturing cost's increase, and the sweeps that later stage operation produced is unfavorable to environmental protection simultaneously. Therefore, a negative clearance stamping die is urgently needed in the market.

SUMMERY OF THE UTILITY MODEL

The utility model provides a technical problem provides a negative clearance stamping die to the problem among the above-mentioned prior art, this mould adopts the mode of negative clearance punching press to reach the purpose that the punching press work piece does not have the burr.

In order to solve the technical problem, the utility model adopts the following technical scheme that the negative clearance stamping die comprises an upper die and a lower die, wherein the upper die comprises an upper die base, an upper backing plate, an upper clamping plate, a stop plate and a stripper plate which are arranged from top to bottom in sequence; the lower die comprises a lower die plate, a lower backing plate and a lower die base which are sequentially arranged from top to bottom; the upper die also comprises a first copper alloy guide sleeve, a guide pillar, a negative clearance insert and a mis-feeding detection device; the first copper alloy guide sleeve is arranged on the stripper plate in a penetrating manner; the guide post is arranged on the upper clamping plate; the lower part of the guide post sequentially penetrates through the stop plate and the first copper alloy guide sleeve from top to bottom; a plurality of annular grooves are formed in the side wall of the guide pillar; graphite solid lubricant is filled in each annular groove; the lower part of the stripper plate is provided with a pin hole with a downward opening; the negative clearance insert is arranged in the middle of the stripper plate and is provided with a female die cavity similar to the shape of a workpiece; the mis-feeding detection device is arranged on the stripper plate and used for detecting whether the strip feeding is mis-performed or not; the lower die also comprises a second copper alloy guide sleeve, a male die, a floating guide pin and a return spring; the second copper alloy guide sleeve is arranged on the lower template and is in clearance fit with the guide pillar; the floating guide pins sequentially penetrate through the lower template and the lower backing plate from top to bottom, the top ends of the floating guide pins are matched with the pin holes, and the upper parts of the floating guide pins are provided with slideways for supporting and guiding strips; the return spring is abutted between the lower die holder and the bottom of the buoyancy lifting material guide pin; the male die is arranged on the lower die plate and is positioned below the cavity of the female die; the cross section of the male die is the same as that of the female die cavity, and the cross section area of the male die is larger than that of the female die cavity.

As a further elaboration of the above technical solution:

in the technical scheme, the lower template is provided with a stepped hole, the upper part of the stepped hole is a small-diameter section with a smaller aperture, and the lower part of the stepped hole is a large-diameter section with a larger aperture; the second copper alloy guide sleeve is in interference fit with the small-diameter section of the stepped hole, and a second shoulder arranged in the large-diameter section of the stepped hole is formed on the side wall of the bottom end of the second copper alloy guide sleeve; the upper end face and the lower end face of the second shoulder are respectively abutted against the stepped face of the stepped hole and the upper end face of the lower backing plate.

In the technical scheme, threaded holes are formed in the lower base plate and the lower die base in a penetrating mode, and the bottom of each threaded hole is screwed with a screw; the bottom of the buoyancy lifting material guide pin is slidably arranged in the threaded hole; the reset spring is arranged in the threaded hole, and two ends of the reset spring are respectively abutted against the machine meter screw and the buoyancy lifting material guide pin.

In the technical scheme, the upper die holder, the upper base plate and the upper clamping plate are fixedly connected in a threaded manner, and the stop plate is movably mounted on the lower side of the upper clamping plate in a vertically sliding manner through an equal-height sleeve; the stop plate is fixedly connected with the stripper plate in a threaded manner; spring accommodating holes penetrate through the upper base plate, the upper clamping plate and the stop plate; and a nitrogen spring is arranged in the spring accommodating hole, and the upper end and the lower end of the nitrogen spring are respectively abutted against the upper die base and the stripper plate.

In the above technical scheme, the misdelivery detection device is a pressure sensor, and the lower template is provided with a vacancy avoiding position for the pressure sensor to penetrate.

In the above technical solution, the first copper alloy guide sleeve and/or the second copper alloy guide sleeve are made of bronze.

The beneficial effects of the utility model reside in that:

1. the cross section of the male die is the same as that of the cavity of the female die, and the cross section area of the male die is larger than that of the cavity of the female die, so that negative clearance stamping is formed, and a workpiece obtained by stamping is free of burrs.

2. The strip material is guided by the buoyancy lifting material guide pin, so that the strip material can have a good guiding effect in the processes of die opening and die closing.

3. The error feeding detection device detects the feeding step of the strip material, and effectively prevents the error feeding of the strip material.

4. The direction by guide pillar, first copper alloy guide pin bushing, second copper alloy guide pin bushing leads to opening, the compound die of last mould and lower mould, has improved the utility model discloses the precision of opening, compound die in-process.

5. Set up graphite solid lubricant on the lateral wall of guide pillar, work as the utility model discloses when carrying out frequent quick opening, compound die action, by producing the high temperature between guide pillar and first copper alloy guide pin bushing, the second copper alloy guide pin bushing, graphite solid lubricant is heated and is formed emollient, plays fine lubricated effect.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

The reference numbers in the figures are respectively: 1. an upper die holder; 2. an upper base plate; 3. an upper splint; 4. a stopper plate; 5. a material removing plate; 6. a nitrogen spring; 7. a first copper alloy guide sleeve; 8. a guide post; 9. a negative clearance insert; 10. a female die cavity; 11. a misdelivery detection device; 12. a graphite solid lubricant; 13. a pin hole; 14. a lower template; 15. a lower base plate; 16. a lower die holder; 17. a second copper alloy guide sleeve; 18. a male die; 19. a material guide pin is lifted; 20. a return spring; 21. a slideway; 22. a stepped hole; 23. a second shoulder; 24. a threaded hole; 25. a machine-meter screw; 26. avoiding the vacancy.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The embodiments described by referring to the drawings are exemplary and intended to be used for explaining the present application and are not to be construed as limiting the present application. In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and thus should not be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise. In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate. In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

Fig. 1 illustrates an embodiment of a negative clearance stamping die, referring to fig. 1, a negative clearance stamping die, comprising an upper die and a lower die.

The upper die comprises an upper die base 1, an upper base plate 2, an upper clamping plate 3, a stop plate 4, a stripper plate 5, a first copper alloy guide sleeve 7, a guide post 8, a negative clearance insert 9 and a mis-feeding detection device 15. The upper die base 1, the upper padding plate 2, the upper clamping plate 3, the stop plate 4 and the stripper plate 5 are sequentially arranged from top to bottom, and specifically speaking: the upper die holder 1, the upper backing plate 2 and the upper clamp plate 3 are fixed in a screwed connection mode, and the stop plate 4 is movably mounted on the lower side of the upper clamp plate 3 in a vertically sliding mode through an equal-height sleeve (not shown in the figure); the stop plate 4 is fixed with the stripper plate 5 in a threaded manner. Spring accommodating holes penetrate through the upper base plate 2, the upper clamping plate 3 and the stop plate 4; and a nitrogen spring 6 is arranged in the spring containing hole, and the upper end and the lower end of the nitrogen spring 6 are respectively abutted against the upper die base 1 and the stripper plate 5. The first copper alloy guide sleeve 7 is arranged on the stripper plate 5 in a penetrating mode. The guide post 8 is arranged on the upper clamping plate 3; the lower part of the guide post 8 sequentially penetrates through the stop plate 4 and the first copper alloy guide sleeve 7 from top to bottom; a plurality of annular grooves are formed in the side wall of the guide post 8; each annular groove is filled with a graphite solid lubricant 12; the lower part of the stripper plate 5 is provided with a pin hole 13 with a downward opening. The negative clearance insert 9 is arranged in the middle of the stripper plate 5; the negative clearance insert 9 is formed with a female die cavity 10 which is similar to the shape of a workpiece; the mis-feeding detection device 15 is arranged on the stripper plate 5 and used for detecting whether the strip feeding is mis-performed or not.

The lower die comprises a lower die plate 14, a lower backing plate 15, a lower die base 16, a second copper alloy guide sleeve 17, a male die 18, a floating guide pin 19 and a return spring 20 which are arranged in sequence from top to bottom. The lower template 14, the lower backing plate 15 and the lower die base 16 are fixed in a threaded manner. The second copper alloy guide sleeve 17 is arranged on the lower template 16 and is in clearance fit with the guide post 8. The buoyancy lifting material guiding pin 19 sequentially penetrates through the lower template 14 and the lower backing plate 15 from top to bottom, the top end of the buoyancy lifting material guiding pin 19 is matched with the pin hole 13, and a slide 21 for supporting and guiding strip materials is arranged at the upper part of the buoyancy lifting material guiding pin 19; the return spring 20 is abutted between the lower die holder 16 and the bottom of the buoyancy lifting guide pin 19. The male die 18 is arranged on the lower die plate 14 and is positioned below the female die cavity 10; the cross section of the male die 18 is the same as that of the female die cavity 10, and the cross section area of the male die 18 is larger than that of the female die cavity 10.

Further, a stepped hole 22 is formed in the lower template 14, the upper portion of the stepped hole 22 is a small-diameter section with a smaller aperture, and the lower portion of the stepped hole 23 is a large-diameter section with a larger aperture; the second copper alloy guide sleeve 17 is in interference fit with the small-diameter section of the stepped hole 22, and a second shoulder 23 arranged in the large-diameter section of the stepped hole 22 is formed on the side wall of the bottom end of the second copper alloy guide sleeve 17; the upper and lower both ends face of second circular bead 23 support respectively lean on in the ladder face of shoulder hole 22 with the up end of lower bolster 15, by lower bolster 14 with lower bolster 15 presss from both sides tightly fixedly second copper alloy guide pin bushing 17 need not extra screw locking fixed, and the dismouting is more simple and convenient.

Further, threaded holes 24 are formed in the lower cushion plate 15 and the lower die base 16 in a penetrating mode, and the bottom of each threaded hole 24 is screwed with a screw 25; the bottom of the buoyancy lifting material guide pin 19 is slidably mounted in the threaded hole 24; the return spring 20 is disposed in the threaded hole 24, and two ends of the return spring respectively abut against the machine meter screw 25 and the buoyancy lifting material guiding pin 19. It is right reset spring 20 with when buoyancy lift guide pin 19 safeguarded, only need unscrew machine rice screw 25 can, need not to dismantle whole the lower mould makes the utility model has the advantages of simple structure is reasonable, it is convenient to maintain.

Further, the misfeed detection device 11 is a pressure sensor, and the lower template 14 is provided with a clearance 26 for the pressure sensor to penetrate through; in actual operation, a plurality of through holes are formed in the waste material area of the strip material at intervals according to the feeding step pitch of the strip material, and the pressure sensor penetrates through the through holes; if the strip materials are fed without errors, the pressure sensor directly penetrates through the through hole and extends into the vacancy avoiding position 26 during die assembly, and the pressure sensor is not influenced by external force; if the strip feeding is wrong, the pressure sensor collides with the strip during die assembly, so that the pressure sensor is triggered to alarm and stops die assembly.

Further, the first copper alloy guide sleeve 7 and/or the second copper alloy guide sleeve 17 are made of bronze.

The utility model discloses at the during operation, for one of them station in the modulus of continuity, die holder 16 is fixed on the workstation, by outside punch press drive upper die base 1 for die holder 16 reciprocates, and its punching press operation is as follows:

firstly, the upper die integrally descends until the stripper plate 5 pushes the bar material down to the male die 18, and at the moment: the guide post 8 is inserted into the second copper alloy guide sleeve 17, the buoyancy lifting guide pin 19 is pressed down, the top end of the buoyancy lifting guide pin is clamped into the pin hole 13, the return spring 20 is compressed, and the pressure sensor extends into the vacancy avoiding position 26.

Secondly, the upper die holder 1, the upper backing plate 2 and the upper clamping plate 3 continue to descend, while the stripper plate 5 and the stop plate 4 are blocked by the bar material and the male die 18 and cannot continue to descend, at this time: the nitrogen spring 6 is compressed and the guide post 8 continues to descend relative to the first copper alloy guide sleeve 7 and the second copper alloy guide sleeve 17.

Thirdly, the upper die holder 1, the upper backing plate 2 and the upper clamping plate 3 continue to move downwards, and the stripper plate 5 is pushed to move downwards for a certain distance, and at the moment: the male die 18 punches the corresponding part of the strip material into the female die cavity 10 to form a workpiece, so as to complete the negative clearance punching operation, the guide post 8 is opposite to the second copper alloy guide sleeve 17, and the buoyancy lifting guide pin 19 and the pressure sensor continue to move downwards for a certain distance.

Correspondingly, the utility model discloses during the die sinking, by reset spring 20 drives lift guide round pin 19 resets, and by lift guide round pin 19 drives the strip and goes upward to reset, by nitrogen spring 6 drives backstop 4 in the last mould and take off flitch 5 for punch holder 3 moves down and resets.

The above is not intended to limit the technical scope of the present invention, and any modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention are all within the scope of the technical solution of the present invention.

Claims

1. A negative clearance stamping die comprises an upper die and a lower die, wherein the upper die comprises an upper die base, an upper base plate, an upper clamping plate, a stop plate and a stripper plate which are sequentially arranged from top to bottom; the lower die comprises a lower die plate, a lower backing plate and a lower die base which are sequentially arranged from top to bottom; it is characterized in that the preparation method is characterized in that,

the upper die also comprises a first copper alloy guide sleeve, a guide pillar, a negative clearance insert and a mis-feeding detection device; the first copper alloy guide sleeve is arranged on the stripper plate in a penetrating manner; the guide post is arranged on the upper clamping plate; the lower part of the guide post sequentially penetrates through the stop plate and the first copper alloy guide sleeve from top to bottom; a plurality of annular grooves are formed in the side wall of the guide pillar; graphite solid lubricant is filled in each annular groove; the lower part of the stripper plate is provided with a pin hole with a downward opening; the negative clearance insert is arranged in the middle of the stripper plate and is provided with a female die cavity similar to the shape of a workpiece; the mis-feeding detection device is arranged on the stripper plate and used for detecting whether the strip feeding is mis-performed or not;

the lower die also comprises a second copper alloy guide sleeve, a male die, a floating guide pin and a return spring; the second copper alloy guide sleeve is arranged on the lower template and is in clearance fit with the guide pillar; the floating guide pins sequentially penetrate through the lower template and the lower backing plate from top to bottom, the top ends of the floating guide pins are matched with the pin holes, and the upper parts of the floating guide pins are provided with slideways for supporting and guiding strips; the return spring is abutted between the lower die holder and the bottom of the buoyancy lifting material guide pin; the male die is arranged on the lower die plate and is positioned below the cavity of the female die; the cross section of the male die is the same as that of the female die cavity, and the cross section area of the male die is larger than that of the female die cavity.

2. The negative clearance stamping die of claim 1, wherein the lower die plate is provided with a stepped hole, the upper portion of the stepped hole is a small-diameter section with a smaller diameter, and the lower portion of the stepped hole is a large-diameter section with a larger diameter; the second copper alloy guide sleeve is in interference fit with the small-diameter section of the stepped hole, and a second shoulder arranged in the large-diameter section of the stepped hole is formed on the side wall of the bottom end of the second copper alloy guide sleeve; the upper end face and the lower end face of the second shoulder are respectively abutted against the stepped face of the stepped hole and the upper end face of the lower backing plate.

3. The negative clearance stamping die according to claim 2, wherein threaded holes are formed in the lower base plate and the lower die holder in a penetrating manner, and a screw is screwed at the bottoms of the threaded holes; the bottom of the buoyancy lifting material guide pin is slidably arranged in the threaded hole; the reset spring is arranged in the threaded hole, and two ends of the reset spring are respectively abutted against the machine meter screw and the buoyancy lifting material guide pin.

4. The negative clearance stamping die according to any one of claims 1 to 3, wherein the upper die holder, the upper backing plate and the upper clamping plate are fixed in a threaded manner, and the stop plate is movably mounted on the lower side of the upper clamping plate in a vertically sliding manner through a contour sleeve; the stop plate is fixedly connected with the stripper plate in a threaded manner; spring accommodating holes penetrate through the upper base plate, the upper clamping plate and the stop plate; and a nitrogen spring is arranged in the spring accommodating hole, and the upper end and the lower end of the nitrogen spring are respectively abutted against the upper die base and the stripper plate.

5. The negative clearance stamping die of claim 4, wherein the misdelivery detection device is a pressure sensor, and the lower die plate is provided with a vacancy avoidance portion for the pressure sensor to penetrate.

6. The negative gap stamping die of claim 5, wherein the first copper alloy guide sleeve and/or the second copper alloy guide sleeve is bronze.