CN212976428U - Stainless steel precise small hole burr-free blanking die - Google Patents

Abstract

The utility model provides a stainless steel precision aperture burr-free blanking die relates to stamping equipment technical field. The blanking die comprises an upper padding plate, a lower padding plate, a blanking mechanism, an upper die plate and a lower die plate, wherein the upper padding plate and the lower padding plate are arranged at intervals, the upper die plate comprises a fixed plate and a movable plate which are arranged at intervals, the blanking mechanism comprises a first-stage stamping needle, a second-stage pre-stamping needle, a second-stage fine stamping needle, a third-stage stamping needle, a second-stage pre-stamping die and a second-stage fine stamping die, the second-stage pre-stamping needle comprises a pre-stamping rod part and a pre-stamping needle head part, the diameter of the pre-stamping rod part is larger than that of the fine stamping rod part, and the hardness of the fine stamping rod part is larger than that of the pre-stamping rod part; the second-stage pre-punching female die comprises a pre-punching conical support rod part and a pre-punching support rod part, and the second-stage fine-punching female die comprises a fine-punching conical rod part. The utility model has the advantages of high production efficiency, high product precision and high economic benefit.

Description

Stainless steel precise small hole burr-free blanking die

Technical Field

The utility model relates to a stamping equipment technical field particularly, relates to a stainless steel precision aperture burr-free blanking mould.

Background

Fig. 7 shows a structure diagram of a coffee machine disk, which includes eight circumferentially arranged primary holes X, a secondary hole Y located at the center of the primary hole, and four tertiary holes Z located outside the secondary hole and distributed circumferentially. The small round piece of the coffee machine is used in the coffee machine and used for controlling the heating temperature of the coffee machine and the steam flow discharge, when the temperature reaches a certain value, the coffee machine starts to exhaust air through the small hole on the steel piece, and simultaneously, boiled water flows out to start to cook coffee. When the air is not exhausted timely, the temperature is too high, the boiler in the coffee machine can explode, and when the temperature is too low, the quality of coffee is affected, so the quality of small discs of the coffee machine is very important for the coffee machine.

Because the thickness of the steel sheet is very thin, the diameters of the secondary holes and the tertiary holes are only 1-3 mm, the requirement on punching equipment is higher, and the diameters of the secondary holes are only 0.250-0.300 mu m, so that the holes with the small diameters are difficult to punch by the existing punching equipment. Therefore, the steel sheet on the market at present adopts an etching process, and the etching process is difficult to control, so that the etched small holes have the problems of rough inner wall, non-circular inner hole, inner hole taper and the like, and meanwhile, the etched finished product rate is poor, the average hole forming rate is 30 percent, the production efficiency is low, the quality is difficult to improve, and the cost is difficult to reduce.

In view of this, this application utility model people's utility model discloses a stainless steel precision aperture does not have burr blanking mould.

SUMMERY OF THE UTILITY MODEL

The utility model provides a stainless steel precise small hole burr-free blanking die, aiming at solving the problems of poor precision, difficult quality guarantee and high production cost of the traditional production mode; the utility model discloses a second purpose provides a stainless steel precision aperture does not have burr blanking die, aims at improving the poor, low, the quality of traditional production mode finished product rate and is difficult to obtain the problem that guarantee and manufacturing cost are high.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a stainless steel precision aperture does not have burr blanking die, includes upper padding plate and lower bolster, blanking mechanism that the interval set up and be located upper padding plate and lower bolster between, the upper padding plate includes fixed plate and the fly leaf that the interval set up, blanking mechanism includes that one-level dashes needle, second grade are towards needle, second grade fine blanking needle, tertiary towards needle, second grade are towards die, second grade fine blanking needle and side cut drift in advance, the fly leaf is close to the lower bolster and with fixed plate sliding connection, the fixed plate is fixed with one-level towards needle, second grade is towards needle, second grade fine blanking needle, tertiary towards needle and side cut drift towards one side of fly leaf along the direction of feed of steel sheet in proper order, one-level towards needle, second grade is towards needle, second grade fine blanking needle, tertiary towards needle and side cut drift run through the fly leaf and with fly leaf sliding connection in advance, the lower bolster be provided with one-level towards needle, second grade, The secondary pre-punching needle, the secondary fine punching needle, the tertiary punching needle and a primary groove, a secondary pre-groove, a secondary groove, a tertiary groove and a trimming groove corresponding to the trimming punch; the secondary pre-punching needle comprises a pre-punching rod part and a pre-punching needle head part, the secondary fine punching needle comprises a fine punching rod part and a fine punching needle head part, the diameter of the pre-punching rod part is larger than that of the fine punching rod part, and the hardness of the fine punching rod part is larger than that of the pre-punching rod part; the second-stage pre-punching female die comprises a pre-punching conical support rod part and a pre-punching support rod part, and the second-stage fine-punching female die comprises a fine-punching conical rod part.

Furthermore, the first-stage punching needles comprise four groups of unit needles, the single group of unit needles comprises two punching needles which are centrosymmetric, the four groups of unit needles are arranged at intervals along the feeding direction of the steel sheet, and eight punched first-stage holes are circumferentially and uniformly distributed.

Furthermore, a plurality of groups of guide needles are arranged on one side of the movable plate facing the lower template at intervals along the steel sheet feeding direction, each group of guide needles comprises two needle heads which are distributed in a central symmetry manner, and a plurality of groups of guide grooves corresponding to the guide needles are arranged on the lower template.

Furthermore, the lower die plate is internally and slidably connected with guide inserts corresponding to the guide pins one to one, and the guide grooves are positioned in the guide inserts.

Furthermore, a plurality of groups of positioning inserts for positioning are connected in the lower die plate in a sliding mode, each group of positioning inserts comprises two symmetrical embedded columns, and annular grooves for steel sheets to penetrate through are formed in the peripheral sides of the embedded columns.

Further, still including the subassembly that cuts off that is used for cutting off the good steel sheet of shaping, the subassembly that cuts off is including cutting off the drift, cutting off adjusting block, cylinder, cut off the drift and cut off the equal sliding connection of adjusting block and just both perpendicular settings in the cope match-plate pattern, the one end of cutting off the adjusting block orientation and cutting off the drift is provided with the wedge, the top and the wedge butt of cutting off the drift, it is fixed with the piston of cylinder to cut off the one end that the drift was kept away from to the adjusting block.

Furthermore, one side of the movable plate, which faces the fixed plate, is provided with a connecting groove, one side of the fixed plate, which faces the movable plate, is provided with a sliding rod in sliding connection with the connecting groove, and a buffer spring is arranged in the connecting groove.

Compared with the prior art, the beneficial effects of the utility model are that:

(1) by arranging the production die, the traditional etching production process is directly converted into a mechanical punching process, so that the production difficulty is reduced, the hole forming rate of the product is improved, the production efficiency of the product is improved, and the economic benefit is also improved;

(2) for the second-stage hole, a method of pre-punching and then fine punching is adopted, wherein during fine punching, a second-stage fine punching needle which is harder than the pre-punching and has a smaller diameter is adopted to meet the requirements of strength and precision during fine punching, and on the other hand, a through hole with a very small aperture is effectively and easily fine punched by effectively matching with the second-stage fine punching needle through the taper angle setting of the second-stage fine punching female die, so that the punching difficulty of the second-stage hole is reduced, and the precision of the second-stage hole is ensured.

(3) The steel sheet is positioned during production by arranging the guide pin, the positioning insert and the guide insert, so that the steel sheet is prevented from deviating during punching, the punching precision is improved, and the product quality is ensured;

(4) through setting up buffer spring, cushion the syringe needle when punching a hole, burr when reducing to punch a hole ensures the quality of product.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

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

FIG. 2 is a schematic structural view of an upper die plate;

FIG. 3 is a schematic view showing a structure of a fixing plate;

FIG. 4 is a schematic structural view of the lower template;

FIG. 5 is a schematic view highlighting the construction of the severing assembly;

FIG. 6 is a view showing a state of change of a steel sheet in a punching process;

FIG. 7 is a block diagram of a tablet of the coffee maker;

fig. 8 is a schematic structural view of the present invention;

FIG. 9 is an enlarged schematic view of the secondary preflush pin of FIG. 8;

FIG. 10 is an enlarged schematic view of the secondary fine blanking pin of FIG. 8;

fig. 11 is a schematic structural view of the present invention;

fig. 12 is an enlarged schematic view of the secondary fine blanking needle of fig. 11.

Description of the main elements

1. An upper base plate; 2. a lower base plate; 3. mounting a template; 31. a fixing plate; 32. a movable plate; 33. a stopper plate; 4. a lower template; 5. cutting off the assembly; 51. cutting off the punch; 52. cutting off the adjusting block; 53. a cylinder; 54. a return spring; 6. a primary guide post; 7. a secondary guide post; 8. a chute; 9. a collar; 10. a compression spring; 40. a blanking mechanism; 11. a slide bar; 12. a first-stage punching needle; 13. a secondary pre-punching needle; 131. pre-punching a rod part; 132. pre-punching a needle head part; 14. secondary fine punching needle; 141. finely punching the rod part; 142. finely punching the needle head; 15. three-stage punching; 16. trimming punches; 41. secondary pre-punching a female die; 411. pre-punching a conical support rod part; 412. pre-punching a supporting block part; 42. secondary fine blanking of a female die; 421. finely punching the conical rod part; 43. stripping the plate insert; 44. finely punching the insert; 17. a primary tank; 18. secondary pre-grooving; 19. a secondary tank; 20. a third-stage groove; 21. cutting an edge groove; 22. positioning the insert; 23. a ring groove; 24. a card slot; 25. a guide needle; 26. a guiding insert; 27. a guide groove; 28. cutting off the groove; x, primary holes; y, secondary pores; z, tertiary hole.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. 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 under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

As shown in fig. 1, 2 and 8, the stainless steel fine-hole burr-free blanking die is characterized by comprising an upper backing plate 1 and a lower backing plate 2 which are arranged at intervals, a blanking mechanism 40, an upper die plate 3 and a lower die plate 4 which are arranged between the upper backing plate 1 and the lower backing plate 2, and a cutting assembly 5 for cutting a formed steel sheet. The cope match-plate pattern 3 is including fixed plate 31 and the fly plate 32 that the interval set up, further be provided with a backstop board 33 between fixed plate 31 and the fly plate 32, blanking mechanism 40 includes that one-level dashes needle 12, second grade is towards needle 13, second grade fine-blanking needle 14, tertiary towards needle 15, second grade is towards die 41, second grade fine-blanking die 42 and side cut drift 16 in advance, fly plate 32 is close to lower bolster 4 and with fixed plate 31 sliding connection, fixed plate 31 is fixed with one-level towards needle 12, second grade is towards needle 13, second grade fine-blanking needle 14, tertiary towards needle 15 and side cut drift 16 in proper order along the direction of feed of steel sheet towards one side of fly plate 32, one-level towards needle 12, second grade is towards needle 13, second grade fine-blanking needle 14, tertiary towards needle 15 and side cut drift 16 and run through fly plate 32 sliding connection, lower bolster 4 is provided with one-level towards needle 12, The first-stage groove 17, the second-stage pre-groove 18, the second-stage groove 19, the third-stage groove 20 and the trimming groove 21 correspond to the second-stage pre-punching needle 13, the second-stage fine punching needle 14, the third-stage punching needle 15 and the trimming punch 16; the secondary pre-punching needle 13 comprises a pre-punching rod part 131 and a pre-punching needle head part 132, the secondary fine punching needle 14 comprises a fine punching rod part 141 and a fine punching needle head part 142, the diameter of the pre-punching rod part 131 is larger than that of the fine punching rod part 141, and the hardness of the fine punching rod part 141 is larger than that of the pre-punching rod part 131.

Specifically, referring to fig. 8 to 10, in this embodiment, the material of the fine blanking rod portion 141 is ASp60, and the material of the pre-blanking rod portion 131 is ASp23, because the requirement for the strength of the fine blanking rod portion 141 is greater to ensure accuracy in the fine blanking process, the fine blanking rod portion 141 employs ASp60 having higher strength, and meanwhile, because the hardness and strength of the fine blanking rod portion 141 themselves are ensured, the diameter of the fine blanking rod portion 141 can be appropriately reduced to ensure compactness, miniaturization and cost reduction of the entire structure, the diameter of the pre-blanking rod portion 131 is 1.2cm to 1.4cm, and the diameter of the fine blanking rod portion 141 is 0.8cm to 1.1 cm. Certainly, the secondary pre-punching needle can also be made of ASP23 material as a whole, and the secondary fine punching needle can also be made of ASP60 material as a whole.

Further, the second-stage pre-punching female die 41 comprises a pre-punching conical support rod part 411 and a pre-punching support block part 412, and since the pre-punching process is only to pre-punch a second-stage hole, the requirements on the position precision and the stability of the whole machining process are high, the second-stage pre-punching female die adopts a structure that the pre-punching support block part is arranged above the pre-punching conical support rod part, wherein the pre-punching support block part adopts a cylindrical structure to ensure the stable stress during the punching after the pre-punching female die is contacted with the lower surface of the pre-punching rod part, and the pre-punching precision of the second-stage hole is ensured, and if only the pre-punching conical support rod part is adopted, the precision is insufficient due to the uneven stress during the punching; in the fine blanking process, since the preliminary blanking of the secondary hole is completed, the rough secondary hole is determined, and the requirements on the position precision and the stability during the fine blanking are not high, the secondary fine blanking female die 42 only comprises a fine blanking conical rod part 421, and is directly contacted with the fine blanking needle head part 142 through the upper end of the sharp corner, so that the secondary hole is rapidly and effectively punched through the sharp corner.

For the second-level hole, a method of pre-punching and then fine punching is adopted, wherein during fine punching, on one hand, a second-level fine punching needle which is harder than the pre-punching and has a smaller diameter is adopted to meet the requirements of strength and precision during fine punching, on the other hand, on the basis that the precision and stability of the second-level pre-punching female die are guaranteed, the cone angle setting of the second-level fine punching female die is adopted to match the second-level fine punching needle to more effectively and easily perform fine punching on the through hole with a tiny hole diameter, the blanking mechanism is ingenious in structural design, the punching difficulty of the second-level hole is greatly reduced, and therefore the precision of the second.

In addition, referring to fig. 11 to 12, the blanking mechanism 40 further includes a stripper insert 43 and a fine blanking insert 44, the stripper insert 43 is sleeved in the movable plate 32, a guide channel adapted to the fine blanking rod 141 is formed in the stripper insert 43, a guide channel adapted to the secondary fine blanking die 42 is formed in the fine blanking insert 44, and meanwhile, pre-blanking related structures such as the secondary pre-blanking needle 13 and the secondary pre-blanking die 41 are omitted, and only the secondary fine blanking needle 14 and the secondary fine blanking die 42 are reserved.

On one hand, the position accuracy of the secondary fine blanking needle 14 during stamping is ensured through the accurate guide channel of the stripping insert 43, and the overall strength is ensured through the secondary fine blanking needle 14 by adopting ASp60 with higher strength; on the other hand, the position of the secondary fine blanking female die during stamping is ensured to be stable through the accurate guide channel of the fine blanking insert 44, and meanwhile, the quick blanking of the secondary fine blanking needle 14 is effectively matched by matching with the sharp-horn-shaped fine blanking tapered rod part 421. The overall structure is more stable and precise, and meanwhile, the structures such as the secondary pre-punching needle 13, the secondary pre-punching concave die 41 and the like can be omitted, so that the cost of the overall structure is greatly reduced.

As shown in fig. 1 and 2, four corners of the lower base plate 2 are provided with first-stage guide posts 6, four corners of the upper base plate 1 are provided with four second-stage guide posts 7, sliding grooves 8 are formed in the second-stage guide posts 7, and the top ends of the first-stage guide posts 6 are slidably connected in the sliding grooves 8. The lantern ring 9 and the compression spring 10 are sleeved on the periphery of the first-level guide post 6, the lantern ring 9 is close to the upper backing plate 1, and the compression spring 10 is located between the lantern ring 9 and the bottom end of the first-level guide post 6. When cope match-plate pattern 3 and lower bolster 4 pressfitting, cope match-plate pattern 3 along the direction of one-level guide post 6 with the pressfitting of lower bolster 4, the precision that the position off tracking never influenced the punching a hole when preventing cope match-plate pattern 3 from pushing down. The compression spring 10 is compressed by the lantern ring 9 in the pressing process, and after the upper template 3 and the lower template 4 are pressed, the upper template 3 can be quickly reset by means of the elastic force of the compression spring 10, so that the power required by resetting the upper template 3 is reduced.

As shown in fig. 2, 3 and 4, a connecting groove (not shown) is provided on the side of the fixed plate 31 facing the movable plate 32, a sliding rod 11 slidably connected to the connecting groove is provided on the side of the fixed plate 31 facing the movable plate 32, and a buffer spring (not shown) is provided in the connecting groove and located between the sliding rod 11 and the groove bottom of the connecting groove. When the movable plate 32 is limited by the lower template 4 to stop moving and the fixed plate 31 continues to be pressed downwards, the buffer spring provides a certain resistance to play a role in buffering, and the punching precision is improved.

In the state of opening the die, the needle heads of the primary punching needle 12, the secondary pre-punching needle 13, the secondary fine punching needle 14, the tertiary punching needle 15 and the trimming punch 16 are flush with the lower surface of the sliding plate. The lower template 4 is provided with a first-stage groove 17, a second-stage pre-groove 18, a second-stage groove 19, a third-stage groove 20 and a trimming groove 21 which correspond to the first-stage punching needle 12, the second-stage pre-punching needle 13, the second-stage fine punching needle 14, the third-stage punching needle 15 and the trimming punch 16.

When punching, the punch press drives the upper template 3 to press downwards, when the movable plate 32 touches the lower template 4, the movement is limited and stopped by the lower template 4, the fixed plate 31 continues to press downwards, and the first-stage punching needle 12, the second-stage pre-punching needle 13, the second-stage fine punching needle 14, the third-stage punching needle 15 and the trimming punch 16 which are positioned on the fixed plate 31 continue to press downwards, so that the steel sheet is penetrated, and the purpose of punching is achieved. In the process, the heads of the first-stage punching needle 12, the second-stage pre-punching needle 13, the second-stage fine punching needle 14, the third-stage punching needle 15 and the trimming punch 16 are in contact with the steel sheet in advance, and after the steel sheet is fixed through the movable plate 32 and the lower template 4, the first-stage punching needle 12, the second-stage pre-punching needle 13, the second-stage fine punching needle 14, the third-stage punching needle 15 and the trimming punch 16 penetrate out of the movable plate 32 to punch the steel sheet, so that the position of the steel sheet cannot deviate during punching, and the punching precision is improved.

The first-stage punching needles 12 comprise four groups of unit needles arranged at intervals along the feeding direction of the steel sheet, the single group of unit needles comprises two punching needles which are centrosymmetric, and eight first-stage holes punched by the four groups of unit needles are circumferentially and uniformly distributed. Because the distance between the eight first-level holes is very small, the requirement on equipment for punching the eight first-level holes is extremely high, the first-level punching needles 12 are divided into four groups and the positions of the four groups are staggered, and the two first-level holes which are centrosymmetric are punched at each time, so that the punching difficulty is reduced, and the punching efficiency is ensured to the maximum extent.

As shown in fig. 3 and 4, a plurality of positioning inserts 22 for fixing the steel sheets are slidably connected in the lower mold plate 4, each positioning insert 22 includes two centrally symmetric embedded columns, and a circular groove 23 for the steel sheet to pass through is formed on the peripheral side of each embedded column. In the mold clamping state, the portion of the positioning insert 22 located below the ring groove 23 is pressed into the lower platen 4, and a spring (not shown) for returning the positioning insert 22 is provided in the lower platen 4. The side of the fixing plate 31 facing the lower template 4 is provided with a clamping groove 24 for clamping the part of the positioning insert 22 above the ring groove 23. When the steel sheet enters between the upper template 3 and the lower template 4, the steel sheet passes through the ring groove 23, so that the steel sheet is positioned, the steel sheet is prevented from shifting in the moving process, and the punching precision is improved. During the process of die assembly, under the pressure of the upper die plate 3, the positioning insert 22 is pressed into the lower die plate 4, and the steel sheet is pressed between the upper die plate 3 and the lower die plate 4 in the process, so that the positioning insert 22 always positions the steel sheet, the steel sheet is prevented from being deviated, and the punching precision is ensured.

As shown in fig. 4, a plurality of groups of pilot needles 25 are fixed on one side of the movable plate 32 facing the lower die plate 4, the plurality of groups of pilot needles 25 are arranged at intervals along the steel sheet feeding direction, and each group of pilot needles 25 comprises two needle heads which are distributed centrosymmetrically. The lower template 4 is internally and slidably connected with guide inserts 26 which correspond to the guide needles 25 one to one, and the tops of the guide inserts 26 are flush with the lower edge line of the ring groove 23 in the state of opening the mold; in the mold-closing state, the guide insert 26 is pressed into the lower platen 4, and a spring (not shown) for returning the guide insert 26 is provided in the lower platen 4. A guide groove 27 corresponding to the guide pin 25 is formed at one end of the guide insert 26 facing the movable plate 32.

In the die closing process, the guide needle 25 contacts the steel sheet in advance along with the movable plate 32 and penetrates through the steel sheet to position the steel sheet, then the first-stage punching needle 12, the second-stage pre-punching needle 13, the second-stage fine punching needle 14, the third-stage punching needle 15 and the trimming punch 16 punch the steel sheet, the position of the steel sheet cannot deviate in the punching process, the punching precision is further improved, and the product quality is improved. Meanwhile, when the guide nail contacts the steel sheet, the guide insert 26 provides a certain supporting force for the steel sheet, so that the buffering effect is achieved, and the positioning precision of the guide nail is improved.

As shown in fig. 4 and 5, the cutting assembly 5 includes a cutting punch 51, a cutting adjusting block 52, an air cylinder 53 and a return spring 54, the air cylinder 53 is fixed at the steel sheet discharging end of the upper backing plate 1, the cutting adjusting block 52 horizontally slides in the fixed plate 31, one end of the cutting adjusting block facing the air cylinder 53 is fixed with a piston rod of the air cylinder 53, the cutting punch 51 is vertically connected in the fixed plate 31 and the movable plate 32 in a sliding manner, a tool bit of the cutting punch is located in the movable plate 32 in the mold opening state, one end of the cutting adjusting block 52 facing the cutting punch 51 is provided with a wedge surface, and the top of the cutting punch 51 is abutted against the. A cutting groove 28 corresponding to the cutting punch 51 is formed in the upper surface of the lower die plate 4. When the steel sheet needs to be cut, the air cylinder 53 is started, the air cylinder 53 pushes the cutting adjusting block 52 to push forwards, and the cutting punch 51 moves towards the direction close to the lower die under the extrusion of the wedge-shaped surface, so that the steel sheet penetrates through the steel sheet and is cut.

The cross section of one end of the cutting punch 51 facing the fixed plate 31 is larger than that of the cutter head, two return springs 54 are respectively arranged on two sides of the lower half part of the cutting punch 51 in the movable plate 32, when the cutting punch 51 cuts downwards, the return springs 54 are compressed between the corners of the cutting punch 51 and the movable plate 32, and when the cutting adjusting block 52 retracts downwards under the driving of the air cylinder 53, the cutting punch 51 is restored to the original position under the elastic force of the return springs 54.

Referring to fig. 1 to 8, a molding method includes the following steps:

and S1, mounting the blanking die on a punching machine, and mounting the steel sheet at the feeding end of the punching machine.

And S2, starting a punch press, feeding the steel sheet between the upper template 3 and the lower template 4 through a feeding machine on the punch press, and controlling the upper template 3 to be pressed downwards with the lower template 4 by the punch press so as to punch the steel sheet and cut edges to obtain the coffee machine small wafer.

The specific process is shown in fig. 6, 7 and 8, the steel sheet moves along the direction of an arrow in the drawing, wherein a is a pilot hole punching process, b is a primary hole punching process, c is a secondary hole punching pre-punching process, d is a secondary hole punching process, e is a tertiary hole punching process, f is an edge cutting process, and the specific operation is as follows:

(a) after the steel sheet enters between the upper template 3 and the lower template 4, the guide pins 25 punch holes on two sides of the steel sheet to obtain guide holes;

(b) the steel sheet with the punched pilot hole continues to move forwards, when the steel sheet reaches the position of the first-stage needle head, the pilot needle 25 penetrates through the pilot groove 27 to position the steel sheet, and the four groups of first-stage needle heads respectively punch the steel sheet to obtain eight first-stage holes X;

(c) the steel sheet punched with the primary hole continues to move forward, when the position of the head of the secondary pre-punching needle 13 is reached, the guide needle 25 penetrates through the guide groove 27 to position the steel sheet, and the head of the secondary pre-punching needle 13 damages the steel sheet to obtain the profile of the secondary hole Y;

(d) the steel sheet continues to move forwards, when the position of the secondary needle head is reached, the pilot needle 25 penetrates through the pilot groove 27 to position the steel sheet, and the secondary pre-punching needle 13 punches the profile obtained in the step (3) to obtain a secondary hole (the diameter of the secondary hole is 0.267 +/-0.006 mu m);

(e) the steel sheet punched with the secondary hole moves forwards continuously, when the steel sheet reaches the position of the tertiary needle head, the guiding needle 25 penetrates through the guiding groove 27 to position the steel sheet, and the tertiary needle head penetrates through the steel sheet to obtain a tertiary hole Z;

(f) and the steel sheet punched with the three-level holes continues to move forwards, when the steel sheet reaches the position below the trimming punch 16, the guiding needle 25 penetrates through the guiding groove 27 to position the steel sheet, the trimming punch 16 trims the steel sheet, and the outline of the small wafer is cut out to obtain the small wafer.

S3, when the steel sheet moves to the discharging end of the die, the cylinder 53 drives the cutting punch 51 to cut the punched steel sheet (as shown by d in figure 6) at regular time, and the steel sheet with a plurality of coffee machine small discs is obtained;

s4, carrying out acid pickling deburring on the steel sheet with a plurality of coffee machine small discs, and then drying and boxing to finish the whole production process of the small discs.

The utility model has the advantages as follows:

1. through setting up the production mould, directly trun into traditional etching production technology into mechanical punching process, reduced the production degree of difficulty, improved the pore-forming rate of product, improved the production efficiency of product, also improved economic benefits simultaneously.

2. Through the arrangement of the guide needle 25, the positioning insert 22 and the guide insert 26, the steel sheet is positioned during production, deviation of the steel sheet during punching is prevented, punching accuracy is improved, and product quality is ensured. Meanwhile, the first-stage guide post 6 and the second-stage guide post 7 are matched to play a role in guiding in the die assembling process, so that the position deviation of the upper die plate 3 is avoided, and the punching precision is further improved.

3. For the first-level hole, a mode of symmetrically punching a plurality of groups of first-level needles is adopted, so that the punching difficulty is reduced, and for the second-level hole, a method of pre-punching and then fine punching is adopted, so that the punching difficulty of the second-level hole is further reduced, and the precision of the first-level hole and the precision of the second-level hole are ensured.

4. The movable plate 32 and the fixed plate 31 are arranged at intervals, so that in the punching process, the heads of the first-stage punching needle 12, the second-stage pre-punching needle 13, the second-stage fine punching needle 14, the third-stage punching needle 15 and the trimming punch 16 are in contact with the steel sheet in advance, after the steel sheet is fixed through the movable plate 32 and the lower template 4, the first-stage punching needle 12, the second-stage pre-punching needle 13, the second-stage fine punching needle 14, the third-stage punching needle 15 and the trimming punch 16 penetrate out of the movable plate 32 again to punch the steel sheet, the position of the steel sheet is ensured not to deviate in punching, and the punching precision is improved.

5. Through setting up buffer spring, cushion the syringe needle when punching a hole, burr when reducing to punch a hole ensures the quality of product.

6. For the second-level hole, a method of pre-punching and then fine punching is adopted, wherein during fine punching, on one hand, a second-level fine punching needle with larger hardness and smaller diameter than that during pre-punching is adopted to meet the requirements of strength and precision during fine punching, on the other hand, on the basis that the precision and stability of the second-level pre-punching female die are guaranteed, the cone angle of the second-level fine punching female die is adopted to match the second-level fine punching needle to more effectively and easily perform fine punching on the through hole with extremely small aperture, the punching mechanism is ingenious in structural design, the punching difficulty of the second-level hole is greatly reduced, and therefore the diameter of the second-level hole which can be punched by the die is guaranteed to be between 0.267 +/-0.06 mu m.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. The utility model provides a stainless steel precision aperture does not have burr blanking die, a serial communication port, including upper padding plate (1) and lower bolster (2), blanking mechanism (40) that the interval set up and be located cope match-plate pattern (3) and lower bolster (4) between upper padding plate (1) and lower bolster (2), cope match-plate pattern (3) are including fixed plate (31) and fly leaf (32) that the interval set up, blanking mechanism (40) are including one-level towards needle (12), second grade towards needle (13), second grade towards needle (14), tertiary towards needle (15), second grade towards die (41), second grade towards die (42) and side cut drift (16), fly leaf (32) are close to lower bolster (4) and with fixed plate (31) sliding connection, fixed plate (31) are fixed with one-level towards one side of fly leaf (32) along the direction of feed of fly leaf in proper order and are towards one side of fly leaf (32) and are towards one-level towards needle (12) towards, The lower die plate comprises a first-stage pre-punching needle (13), a second-stage fine punching needle (14), a third-stage punching needle (15) and a trimming punch (16), wherein the first-stage punching needle (12), the second-stage pre-punching needle (13), the second-stage fine punching needle (14), the third-stage punching needle (15) and the trimming punch (16) penetrate through a movable plate (32) and are in sliding connection with the movable plate (32), and a first-stage groove (17), a second-stage groove (18), a second-stage groove (19), a third-stage groove (20) and a trimming groove (21) which correspond to the first-stage punching needle (12), the second-stage pre-punching needle (13), the second-stage fine punching needle (14), the third-stage punching needle (15) and the trimming; the secondary pre-punching needle (13) comprises a pre-punching rod part (131) and a pre-punching needle head part (132), the secondary fine punching needle (14) comprises a fine punching rod part (141) and a fine punching needle head part (142), the diameter of the pre-punching rod part (131) is larger than that of the fine punching rod part (141), and the hardness of the fine punching rod part (141) is larger than that of the pre-punching rod part (131); the secondary pre-punching female die (41) comprises a pre-punching conical support rod part (411) and a pre-punching support rod part (412), and the secondary fine-punching female die (42) comprises a fine-punching conical rod part (421).

2. The stainless steel precise small hole burr-free blanking die as claimed in claim 1, wherein said primary punching pins (12) comprise four groups of unit pins, and a single group of said unit pins comprises two punching pins with central symmetry, said four groups of said unit pins are arranged at intervals along the feeding direction of the steel sheet, and eight primary holes are punched and uniformly distributed circumferentially.

3. The stainless steel precise small hole burr-free blanking die as claimed in claim 1, wherein a plurality of groups of pilot needles (25) are arranged at intervals on one side of the movable plate (32) facing the lower die plate (4) along the steel sheet feeding direction, each group of pilot needles (25) comprises two needle heads which are distributed in a central symmetry manner, and a plurality of groups of pilot grooves (27) corresponding to the pilot needles (25) are arranged on the lower die plate (4).

4. The stainless steel precise small hole burr-free blanking die as claimed in claim 3, wherein a pilot insert (26) corresponding to the pilot pins (25) in a one-to-one manner is slidably connected in the lower die plate (4), and the pilot groove (27) is located in the pilot insert (26).

5. The stainless steel precise small hole burr-free blanking die as claimed in claim 1, wherein a plurality of sets of positioning inserts (22) for positioning are slidably connected in the lower die plate (4), each set of positioning inserts (22) comprises two symmetrical embedded columns, and a circular groove (23) for a steel sheet to pass through is formed in the peripheral side of each embedded column.

6. The stainless steel fine small hole burr-free blanking die is characterized by further comprising a cutting assembly (5) for cutting off a formed steel sheet, wherein the cutting assembly (5) comprises a cutting punch (51), a cutting adjusting block (52) and a cylinder (53), the cutting punch (51) and the cutting adjusting block (52) are connected in the upper die plate (3) in a sliding mode and are arranged vertically, a wedge-shaped surface is arranged at one end, facing the cutting punch (51), of the cutting adjusting block (52), the top of the cutting punch (51) abuts against the wedge-shaped surface, and one end, far away from the cutting punch (51), of the cutting adjusting block (52) is fixed with a piston of the cylinder (53).

7. A stainless steel fine small hole burr-free blanking die according to claim 1, further characterized in that a side of the movable plate (32) facing the fixed plate (31) is provided with a connecting groove, a side of the fixed plate (31) facing the movable plate (32) is provided with a sliding rod (11) slidably connected with the connecting groove, and a buffer spring is arranged in the connecting groove.

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