Shell continuous stamping die

Abstract

The utility model relates to the technical field of continuous stamping of metal pieces, in particular to a shell continuous stamping die which comprises a lower die assembly and an upper die assembly, an initial material belt continuously enters from the feeding end of the lower die assembly, the upper die assembly conducts continuous stamping operation on the material belt, and the material belt is gradually stamped and formed into a preset shell shape. The punching station is sequentially provided with a cutting station, a stretching station, a step station, a convex covering station, a punching station, a tapping station and a discharging station, and an initial material belt sequentially penetrates through the stations, so that the initial material belt is gradually punched and formed into a process blank and finally is continuously punched and formed into a finished product shell, and the finished product shell is discharged at the discharging end. In conclusion, more optimized continuous punch forming operation can be carried out on an initial material belt, the surface of a final finished product shell is flat, smooth and burr-free, grinding and polishing are not needed, the opening part of the product is flat, the shape and size are more accurate, and the product has better quality and longer service life.

Description

Technical Field

[0001] The utility model relates to the technical field of continuous stamping of metal parts, in particular to a continuous stamping die for a shell. Background Technique

[0002] Stamping is a forming processing method that relies on a press and a die to apply external force to plates, strips, tubes, profiles, etc., causing plastic deformation or separation to obtain workpieces (stamped parts) with the required shape and size. Stamping processing has high production efficiency, convenient operation, and is easy to realize mechanization and automation. During stamping, the dimensional and shape accuracy of the stamped parts can be guaranteed through the die; stamping can process parts with a relatively large size range and complex shape; in addition, the forming efficiency of stamping is high. Due to the superiority of stamping, it is widely used in the production of workpieces in various fields.

[0003] A stamping die is a die used in the stamping process. The raw material undergoes plastic deformation in the die under the action of a stamping device to obtain parts with the required shape and size.

[0004] When the existing stamping and stretching forming process on the market is in production, it is easy to cause the surface of the product to be uneven and not smooth, and it requires grinding and polishing, increasing production costs and reducing production efficiency. Therefore, there is a special need to develop a new type of continuous stamping process to improve the production efficiency of such products and reduce production costs. Content of the Utility Model

[0005] The utility model aims to provide a technical solution that can solve the above problems to overcome the above deficiencies.

[0006] The utility model provides a continuous stamping die for a shell, which includes a lower die assembly set as a fixed die and an upper die assembly set as a moving die. A stamping station is formed between the lower die assembly and the upper die assembly. The initial strip continuously moves from the feeding end of the lower die assembly into the stamping station, enabling the upper die assembly to perform continuous stamping operations on the strip, gradually stamping and forming it into a preset shell shape, and discharging it from the discharging end of the lower die assembly; along the advancing direction of the initial strip, the stamping station is successively provided with a cutting station, a stretching station, a step station, a convex boss station, a punching station, a tooth drawing station, and a discharging station. The initial strip passes through the above stations in sequence, and thus is gradually stamped and formed into a process blank, and finally is continuously stamped and formed into a finished shell, and is discharged at the discharging end.

[0007] As a further solution of the present utility model: The lower die assembly of the stretching station is provided with a first inner punch and a first cavity die sleeved on the first inner punch. The upper die assembly of the stretching station is provided with a first punch. The first punch, the first inner punch and the first cavity die cooperate with each other to perform the first stretching and stamping on the strip material, so that the strip material is formed into a process blank in the shape of a cylindrical bowl; The lower die assembly of the stretching station is further provided with a second inner punch and a second cavity die sleeved on the second inner punch. The upper die assembly of the stretching station is further provided with a second punch. The second punch, the second inner punch and the second cavity die cooperate with each other to perform the second stretching and stamping on the process blank, so as to further reduce the wall thickness of the process blank.

[0008] As a further solution of the present utility model: The upper die assembly of the step station is provided with a step upper punch. The lower die assembly of the step station is provided with a step lower punch, a step inner punch and a step cavity die. The step cavity die is sleeved on the step inner punch. The step lower punch is embedded in the step inner punch and moves along the step inner punch, so as to cooperate with the step upper punch to punch the bottom of the process blank, and then form the bottom step of the process blank.

[0009] As a further solution of the present utility model: A sizing station is further arranged between the step station and the boss station. The upper die assembly of the sizing station is provided with a sizing punch. The lower die assembly of the sizing station is provided with a sizing inner punch and a sizing cavity die. The sizing cavity die is sleeved on the sizing inner punch. The sizing punch, the sizing inner punch and the sizing cavity die cooperate with each other to perform a sizing and stamping operation on the process blank.

[0010] As a further solution of the present utility model: The lower die assembly of the boss station is provided with a boss lower punch and a boss inner punch. The boss lower punch is movably connected in the inner through hole of the boss inner punch and punches the bottom of the process blank upward to form an upward convex boss; The upper die assembly of the boss station is provided with a boss upper punch and a first chamfering punch. The first chamfering punch is movably connected in the inner through hole of the boss upper punch and punches and forms a corresponding chamfer on the top of the boss.

[0011] As a further solution of the present utility model: The upper die assembly of the punching station is provided with a punching punch and a stripper insert. The punching punch is movably connected in the inner through hole of the stripper insert. The lower die assembly of the punching station is provided with a cutting insert and a punching cavity die. The cutting insert is movably connected in the inner through hole of the punching cavity die. The punching punch and the cutting insert cooperate with each other to punch and form a through hole of the boss.

[0012] As a further solution of the utility model: The upper die assembly of the tooth drawing station is provided with a spring member, a tooth drawing ejector rod, a stripping ejector rod and a stripping insert. The lower die assembly of the tooth drawing station is provided with a tooth drawing punch, an inner tooth drawing ejector and a tooth drawing cavity die. The stripping insert, the inner tooth drawing ejector and the tooth drawing cavity die cooperate with each other to clamp the process blank. The tooth drawing ejector rod and the tooth drawing punch cooperate with each other to perform tooth drawing stamping on the through hole part of the convex hull, so as to stamp the convex hull part into the bottom hole column of the process blank.

[0013] As a further solution of the utility model: The upper die assembly of the discharging station is provided with a discharging punch and a discharging insert. The discharging insert is sleeved on the discharging punch. The lower die assembly of the discharging station is provided with a discharging cutting edge. The discharging punch and the discharging cutting edge cooperate with each other to perform punching and discharging on the process blank.

[0014] As a further solution of the utility model: The upper die assembly between the punching station and the tooth drawing station is provided with a second chamfering upper punch, and the corresponding lower die assembly is provided with a second chamfering lower punch. The second chamfering upper punch and the second chamfering lower punch cooperate with each other to stamp a certain chamfer on the through hole part of the convex hull.

[0015] As a further solution of the utility model: The upper die assembly between the tooth drawing station and the discharging station is provided with a third chamfering upper punch, and the corresponding lower die assembly is provided with a third chamfering lower punch. The third chamfering upper punch and the third chamfering lower punch cooperate with each other to stamp a certain chamfer on both ends of the bottom hole column after tooth drawing stamping.

[0016] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0017] 1. By arranging two sets of stretching dies at the stretching station, independent two-time stretching forming operations are performed on the process blank, so that it can first perform a preliminary stretching with a relatively shallow depth and be stamped into a preliminary cylindrical bowl-shaped process blank. Then, a second post-stretching with precise dimensions is performed to reduce the side wall thickness of the product and reduce the burrs on the surface of the blank, making it smoother.

[0018] 2. After performing corresponding step stamping at the step station, a sizing station can be set up to correct the problems of side wall deformation and surface unevenness that may occur during step stamping at the sizing station, so that the process blank can be formed more smoothly and does not need to be polished after discharging.

[0019] 3. It also undergoes the sequential cooperation of the convex hull station, punching station, and tooth drawing station, enabling the formation of the bottom hole column of the process blank to be smoother. Through step-by-step corresponding stamping deformation and stretching and shaping of the process blank, the stamping of the bottom hole column becomes flatter and smoother, avoiding burrs and unevenness in one-step stamping. As a result, the finished shell after discharging does not require grinding to form the final product. Moreover, the parameters of the hole diameter and wall thickness are more accurate, endowing it with better quality and longer service life during use.

[0020] Therefore, through the above improvements, the present utility model can provide a continuous stamping die for a shell, enabling more optimized continuous stamping and forming operations on the initial strip material. The surface of the final finished shell is flat, smooth, and free of burrs, without the need for grinding and polishing, and the opening part of the product is flat. The shape and size are more accurate, with better quality and longer service life.

[0021] Additional aspects and advantages of the present utility model will be partially given in the following description, partially becoming apparent from the following description, or understood through the practice of the present utility model. Brief Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic structural diagram of the overall die of the present utility model;

[0024] Figure 2 It is a schematic stamping structure diagram of the upper die assembly of the present utility model;

[0025] Figure 3 It is a schematic stamping structure diagram of the lower die assembly of the present utility model;

[0026] Figure 4 It is a schematic structural diagram of the stepped upper punch and the sizing punch of the present utility model;

[0027] Figure 5 It is a schematic structural diagram of the punching punch and the tooth drawing ejector rod of the present utility model;

[0028] Figure 6 It is a schematic structural diagram of the stepped lower punch and the convex hull lower punch of the present utility model;

[0029] Figure 7 It is a schematic structural diagram of the cutting insert and the tooth drawing punch of the present utility model;

[0030] Figure 8 is a schematic structural view of the process blank and the blank connecting strip of the present utility model;

[0031] Figure 9 is a schematic structural view of the bottom step and the convex bulge of the present utility model;

[0032] Figure 10 is a schematic structural view of the bottom hole column and the finished product housing of the present utility model.

[0033] The reference numerals and names in the figure are as follows:

[0034] 10 upper die assembly; 11 lower die assembly; 12 edge positioning post; 13 positioning punching knife; 14 positioning knife seat; 15 second chamfer upper punch; 16 second chamfer lower punch; 17 third chamfer upper punch; 18 third chamfer lower punch; 19 guiding rod; 20 cutting station; 21 first cutting knife; 22 second cutting knife; 23 third cutting knife; 24 fourth cutting knife; 25 first blanking knife seat; 26 second blanking knife seat; 27 third blanking knife seat; 28 fourth blanking knife seat; 30 stretching station; 31 first inner top; 32 first cavity die; 33 first punch; 34 second inner top; 35 second cavity die; 36 second punch; 40 step station; 41 step upper punch; 42 step lower punch; 43 step inner top; 44 step cavity die; 45 shaping station; 46 shaping punch; 47 shaping inner top; 48 shaping cavity die; 50 convex bulge station; 51 convex bulge upper punch; 52 first chamfer punch; 53 convex bulge lower punch; 54 convex bulge inner top; 60 punching station; 61 punching punch; 62 stripping insert; 63 cutting edge insert; 64 punching cavity die; 70 thread tapping station; 71 spring member; 72 thread tapping ejector rod; 73 stripping ejector rod; 74 stripping insert; 75 thread tapping punch; 76 thread tapping inner top; 77 thread tapping cavity die; 80 discharging station; 81 discharging punch; 82 discharging insert; 83 discharging cutting edge; 90 initial strip; 91 blank connecting strip; 92 process blank; 93 bottom step; 94 flange edge; 95 convex bulge; 96 bottom hole column; 97 finished product housing. Specific embodiments

[0035] The technical solutions in the embodiments of the present utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0036] Please refer to Figures 1 to 10, in the embodiment of the present utility model, a continuous stamping die for a housing includes a lower die assembly 11 set as a fixed die and an upper die assembly 10 set as a moving die. A stamping station is formed between the lower die assembly 11 and the upper die assembly 10. The initial strip 90 continuously moves from the feeding end of the lower die assembly 11 into the stamping station, enabling the upper die assembly 10 to perform continuous stamping operations on the strip, gradually stamping it into a preset housing shape, and discharging it from the discharging end of the lower die assembly 11; along the advancing direction of the initial strip 90, the stamping station is successively provided with a cutting station 20, a stretching station 30, a stepped station 40, a bulging station 50, a punching station 60, a tooth drawing station 70, and a discharging station 80. The initial strip 90 passes through the above stations in sequence, thus being gradually stamped into a process blank 92 and finally continuously stamped into a finished housing 97, and being discharged at the discharging end.

[0037] Specifically, the housing is mainly used on an air-conditioning compressor and is used on a corresponding joint valve to prevent gas leakage. Therefore, the dimensions of its corresponding flange edge 94 and bottom hole column 96 need to be more precise and there should be no burrs to prevent air leakage. The initial strip 90 of this embodiment mainly involves metal materials such as copper, aluminum, and iron, and is a new type of composite technology die structure integrating multiple stretching, extrusion forming, and side cutting. The stretching process is to improve the plasticity of the material under the existing environmental conditions, and improve the forming state of the product by improving the stretching stress condition of the material, so as to meet the design requirements and purposes. It can make the surface of the finished housing 97 flat, smooth and without burrs, without the need for grinding and polishing, and the opening part of the product is flat; the side punching surface of this die technology structure does not bulge or deform; further improving the quality and service life of the finished housing 97.

[0038] Secondly, the specific stamping process of the continuous stamping die for the housing of the present utility model is designed through research and analysis. The upper die assembly 10 and the lower die assembly 11 cooperate with each other to gradually extrude the initial strip 90, causing plastic changes in the material to reach the drawing dimensions of the product and meet the corresponding product quality requirements. And the surface of the corresponding die is professionally treated to make it smooth and wear-resistant. The successive cooperation of the upper die assembly 10 and the lower die assembly 11 can make the inner and outer surfaces of the process blank 92 closely adhere to the die surface and the product, and can extrude the excess material around the entire circumference of the process blank 92 to the opening waste material for unified cutting and discharging. Thus, the thickness of the material at the top and around the entire circumference of the product can be made consistent, and the surface of the finished housing 97 is not bulged, not deformed, flat, smooth, and does not require grinding, reducing production costs and increasing production efficiency.

[0039] Such as Figure 2 and Figure 3As shown, preferably, the cutting station 20 is provided with a cutting knife and a blanking knife holder, which cooperate with each other to stamping and form the process blank 92 and the blank connecting strip 91 that are respectively connected to each other. The upper die assembly 10 of the cutting station 20 is provided with a first cutting knife 21, a second cutting knife 22, a third cutting knife 23 and a fourth cutting knife 24, and the lower die assembly 11 of the cutting station 20 is provided with corresponding first blanking knife holders 25, second blanking knife holders 26, third blanking knife holders 27 and fourth blanking knife holders 28, which cooperate with each other to stamping and form the blank connecting strip 91 of the process blank 92.

[0040] Specifically, in order to cut out the circular process blank 92 required for the housing and at the same time cut out the blank connecting strip 91 between the circular process blanks 92, therefore, cutting treatment can be carried out by setting cutting knives and blanking knife holders with special shapes. For example, the first cutting knife 21 and the second cutting knife 22 with special shapes are set, which respectively cooperate with the first blanking knife holder 25 and the second blanking knife holder 26 to cut the edge part of the initial strip 90, so as to form the blank connecting strip 91 of the edge part of the process blank 92. Similarly, the third cutting knife 23 and the fourth cutting knife 24 with special shapes are also set, which respectively cooperate with the third blanking knife holder 27 and the fourth blanking knife holder 28 to cut the middle part of the initial strip 90, so as to form the blank connecting strip 91 of the middle part of the process blank 92.

[0041] In addition, in order to position the initial strip 90, preferably, a positioning punching knife 13 and a positioning knife holder 14 can be set to punch the initial strip 90 to form a center positioning hole. For the center positioning hole, a through hole with a relatively small diameter can be punched first, so that corresponding center positioning components can be set in the subsequent stamping die to position the center positioning hole, so that the subsequent stamping die can perform stamping operations more accurately. After the initial strip 90 continues to travel a certain distance and the positioning of the entire strip is accurate, the position of the center positioning hole can be cut and removed by using the fourth cutting knife 24 and the fourth blanking knife holder 28 in cooperation.

[0042] In addition, as Figure 1 shown, the lower die assembly 11 is also provided with a plurality of edge positioning posts 12, and the edge positioning posts 12 are fixedly connected to the corresponding positions of the lower die assembly 11 corresponding to the edge part of the process blank 92, so that the edge positioning posts 12 can position the edge part of the process blank 92 during the stamping process.

[0043] Specifically, multiple edge positioning posts 12 can be respectively arranged in multiple different areas of the stamping area. By using the edge parts of the process blank 92, corresponding positioning operations are carried out, so that in subsequent stamping and forming operations, the process blank 92 can be accurately positioned at the corresponding operation stations for corresponding stamping and forming operations. In addition, notches can be provided at the positions of the edge positioning posts 12 corresponding to the edge parts of the process blank 92, so that the edge parts can slide within the notches, thereby also limiting the up and down directions of the process blank 92.

[0044] As Figure 2 , Figure 3 , Figure 4 and Figure 6 shown, preferably, the lower die assembly 11 of the stretching station 30 is provided with a first inner punch 31 and a first cavity die 32 sleeved on the first inner punch 31. The upper die assembly 10 of the stretching station 30 is provided with a first punch 33. The first punch 33, the first inner punch 31 and the first cavity die 32 cooperate with each other to perform the first stretching and stamping on the strip, so that the strip is formed into a process blank 92 in the shape of a cylindrical bowl. The lower die assembly 11 of the stretching station 30 is further provided with a second inner punch 34 and a second cavity die 35 sleeved on the second inner punch 34. The upper die assembly 10 of the stretching station 30 is further provided with a second punch 36. The second punch 36, the second inner punch 34 and the second cavity die 35 cooperate with each other to perform the second stretching and stamping on the process blank 92, so that the wall thickness of the process blank 92 is further reduced.

[0045] Specifically, by setting two sets of stretching dies at different positions of the stretching station 30, independent two-time stretching and forming operations are carried out on the process blank 92, so that it can first perform a preliminary stretching with a shallower depth and be stamped into a preliminary cylindrical bowl-shaped process blank 92. Then, a second precise-size post-stretching is carried out to reduce the side wall thickness of the product, and at the same time, the depth of the bottom can be deepened, so that the size of the process blank 92 is more in line with the size of the final product.

[0046] As Figure 4 and Figure 6 shown, preferably, the upper die assembly 10 of the step station 40 is provided with a step upper punch 41. The lower die assembly 11 of the step station 40 is provided with a step lower punch 42, a step inner punch 43 and a step cavity die 44. The step cavity die 44 is sleeved on the step inner punch 43. The step lower punch 42 is embedded in the recess of the step inner punch 43 and can move along the step inner punch 43, so as to cooperate with the step upper punch 41 to punch the bottom of the process blank 92, and then form the bottom step 93 of the process blank 92.

[0047] Specifically, the bottom steps 93 of the process blank 92 are provided around the bottom and can be provided in multiple numbers, such as three. Therefore, the step lower punch 42 is also provided in the recesses around the inner top 43 of the step. It can be understood that in order to enable the step lower punch 42 to punch upward to form a step, corresponding grooves need to be provided at the positions of the step upper punch 41 corresponding to the step, so that the step can be normally punched and formed upward.

[0048] In addition, in order to form graphics such as product logos, brand names or product models on the finished product housing 97, corresponding graphic protrusions can also be provided on the top of the bench lower punch, so as to form corresponding intaglio graphics on the bottom surface of the finished product housing 97. It can be understood that if other graphics also need to be punched and formed at other positions on the bottom surface, other lower punches can also be provided at the corresponding positions of the inner top 43 of the step, and corresponding graphic protrusions can be provided.

[0049] As Figure 4 and Figure 6 shown, preferably, a sizing station 45 can also be provided between the step station 40 and the boss station 50. The upper die assembly 10 of the sizing station 45 is provided with a sizing punch 46, and the lower die assembly 11 of the sizing station 45 is provided with a sizing inner top 47 and a sizing cavity die 48. The sizing cavity die 48 is sleeved on the sizing inner top 47. The sizing punch 46, the sizing inner top 47 and the sizing cavity die 48 cooperate with each other to perform a stamping and sizing operation on the flange 94 at the open top of the process blank 92.

[0050] Specifically, in order to correct and shape the thickness of the side wall at the open top of the process blank 92, a corresponding sizing station 45 can be provided. By using the cooperation of the sizing punch 46, the sizing inner top 47 and the sizing cavity die 48, the flange 94 at the open top is intensively stamped so that its thickness is stamped to a preset 1.8 millimeters.

[0051] As Figure 2 、 Figure 3 、 Figure 4 and Figure 6 shown, preferably, the lower die assembly 11 of the boss station 50 is provided with a boss lower punch 53 and a boss inner top 54. The boss lower punch 53 is movably connected in the inner through hole of the boss inner top 54 and punches upward on the bottom part of the process blank 92 to form it into an upward convex boss 95; the upper die assembly 10 of the boss station 50 is provided with a boss upper punch 51 and a first chamfer punch 52. The first chamfer punch 52 is movably connected in the inner through hole of the boss upper punch 51 and punches and forms a corresponding chamfer on the top of the boss 95.

[0052] Specifically, multiple convex hulls 95 can be provided at the vacant part corresponding to the non-step position at the bottom of the process blank 92. For example, three convex hulls 95 are provided, so the convex hull lower punch 53 can be provided with three pieces, and then three corresponding convex hulls 95 can be punched upward. In order to form a chamfer at the top of the convex hull 95, a first chamfer punch 52 can also be provided on the upper die assembly 10 to punch downward a certain distance on the top of the convex hull 95 to form the required chamfer.

[0053] As Figure 2 , Figure 3 , Figure 5 and Figure 7 shown, preferably, the upper die assembly 10 of the punching station 60 is provided with a punching punch 61 and a stripping insert. The punching punch 61 is movably connected to the inner through hole of the stripping insert. The lower die assembly 11 of the punching station 60 is provided with a cutting insert 63 and a punching cavity die 64. The cutting insert 63 is movably connected to the inner through hole of the punching cavity die 64. The punching punch 61 and the cutting insert 63 cooperate with each other to punch and form the through hole of the convex hull 95.

[0054] Specifically, the upper die assembly 10 can also be provided with a stripping pin. The stripping pin is movably connected to the inner through hole of the punching punch 61 and performs a stripping process on the punched waste material, such as discharging the waste material from the inner through hole of the cutting insert 63.

[0055] As Figure 2 , Figure 3 , Figure 5 and Figure 7 shown, preferably, the upper die assembly 10 of the tooth drawing station 70 is provided with a spring member 71, a tooth drawing ejector rod 72, a stripping ejector rod 73 and a stripping insert. The lower die assembly 11 of the tooth drawing station 70 is provided with a tooth drawing punch 75, a tooth drawing inner ejector 76 and a tooth drawing cavity die 77. The stripping insert, the tooth drawing inner ejector 76 and the tooth drawing cavity die 77 cooperate with each other to press the process blank 92. The tooth drawing ejector rod 72 and the tooth drawing punch 75 cooperate with each other to perform a tooth drawing punch on the through hole part of the convex hull 95, so as to punch and form the convex hull 95 part into the bottom hole column 96 of the process blank 92.

[0056] Specifically, when the die is closed, the tooth drawing punch 75 runs upward to perform a tooth drawing punch on the through hole part of the convex hull 95. At the same time, the tooth drawing ejector rod 72 and the stripping ejector rod 73 can retreat a certain distance to compress the spring member 71. When the die is opened, driven by the elastic force of the spring member 71, the tooth drawing ejector rod 72 and the stripping ejector rod 73 can be reset to eject the turning mouth of the bottom hole column 96. In addition, at the bottom edge position of the bottom hole column 96 corresponding to the tooth drawing punch 75, a corresponding chamfer punching shape can also be provided, so as to punch and form a certain chamfer at the bottom edge position of the bottom hole column 96.

[0057] As Figure 2 , Figure 3 , Figure 5 and Figure 7 shown, preferably, the upper die assembly 10 at the discharging station 80 is provided with a discharging punch 81 and a discharging insert 82. The discharging insert 82 is sleeved on the discharging punch 81. The lower die assembly 11 at the discharging station 80 is provided with a discharging cutting edge 83. The discharging punch 81 and the discharging cutting edge 83 cooperate with each other to punch and discharge the process blank 92.

[0058] Specifically, the discharging punch 81 and the discharging cutting edge 83 cooperate with each other. When the die is closed, the process blank 92 is punched to cut out the corresponding finished shell 97, and the finished shell 97 falls from the opening of the discharging cutting edge 83 to perform the corresponding discharging operation.

[0059] In addition, since the finished shell 97 directly falls from the opening of the discharging cutting edge 83 for discharging, and the blank connecting strip 91 continues to move forward. Since the remaining part of the waste material and the blank connecting strip 91 are relatively thin, they are prone to deformation, such as bending upward, which brings inconvenience to the stamping. Therefore, as Figure 7 shown, a guiding rod 19 can be provided to guide and limit the blank connecting part and part of the waste material after the discharging cutting edge 83 to prevent deformation.

[0060] As Figure 2 and Figure 3 shown, preferably, the upper die assembly 10 between the punching station 60 and the tooth drawing station 70 is provided with a second chamfering upper punch 15, and the corresponding lower die assembly 11 is provided with a second chamfering lower punch 16. The second chamfering upper punch 15 and the second chamfering lower punch 16 cooperate with each other to punch a certain chamfer on the through-hole part of the convex boss 95. The upper die assembly 10 between the tooth drawing station 70 and the discharging station 80 is provided with a third chamfering upper punch 17, and the corresponding lower die assembly 11 is provided with a third chamfering lower punch 18. The third chamfering upper punch 17 and the third chamfering lower punch 18 cooperate with each other to punch a certain chamfer on the two end edges of the bottom hole column 96 after tooth drawing stamping.

[0061] Specifically, the chamfer punched by the second chamfering upper punch 15 and the second chamfering lower punch 16 can facilitate the subsequent tooth drawing operation of the through-hole of the convex boss 95 at the tooth drawing station 70. The chamfer punched by the cooperation of the third chamfering upper punch 17 and the third chamfering lower punch 18, that is, the chamfer punching on the two end edges of the bottom hole column 96, can make the size of the bottom hole column 96 more accurate, and at the same time make its surface smooth and flat, so that it can meet the shape requirements of the final finished shell 97.

[0062] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model.

Claims

1. A continuous stamping die for a housing, characterized in that: The invention comprises a lower die assembly (11) configured as a fixed die and an upper die assembly (10) configured as a movable die, wherein a stamping station is formed between the lower die assembly (11) and the upper die assembly (10), wherein an initial material strip (90) continuously moves from a feeding end of the lower die assembly (11) into the inside of the stamping station, so that the upper die assembly (10) performs continuous stamping operations on the material strip, gradually stamping and forming it into a preset shell shape, and performing a discharge operation from a discharge end of the lower die assembly (11); the stamping station is provided with a cutting station (20), a stretching station (30), a step station (40), a convex hull station (50), a punching station (60), a thread extraction station (70) and a discharge station (80) in sequence along the moving direction of the initial material strip (90), wherein the initial material strip (90) passes through the above-mentioned stations in sequence, thereby being gradually stamped and formed into a process blank (92), and finally being continuously stamped and formed into a finished shell (97), and then being discharged at the discharge end.

2. A shell continuous stamping die according to claim 1, characterized in that: The lower die assembly (11) of the stretching station (30) is provided with a first inner top (31) and a first cavity die (32) sleeved on the first inner top (31); the upper die assembly (10) of the stretching station (30) is provided with a first punch (33); the first punch (33), the first inner top (31) and the first cavity die (32) cooperate with each other to perform a first stretching and stamping on the material strip, so that the material strip is formed into a cylindrical bowl-shaped process blank (92); the lower die assembly (11) of the stretching station (30) is further provided with a second inner top (34) and a second cavity die (35) sleeved on the second inner top (34); the upper die assembly (10) of the stretching station (30) is further provided with a second punch (36); the second punch (36), the second inner top (34) and the second cavity die (35) cooperate with each other to perform a second stretching and stamping on the process blank (92), so that the wall thickness of the process blank (92) is further reduced.

3. A shell continuous stamping die according to claim 1, characterized in that: The upper die assembly (10) of the step station (40) is provided with a step upper punch (41), and the lower die assembly (11) of the step station (40) is provided with a step lower punch (42), a step inner top (43) and a step cavity mold (44), wherein the step cavity mold (44) is sleeved on the step inner top (43), and the step lower punch (42) is embedded in the step inner top (43) and moves along the step inner top (43), thereby cooperating with the step upper punch (41) to punch the bottom of the process blank (92), thereby forming a bottom step (93) of the process blank (92).

4. A shell continuous stamping die according to claim 1, characterized in that: A shaping station (45) is also provided between the step station (40) and the convex bulge station (50); an upper die assembly (10) of the shaping station (45) is provided with a shaping punch (46); a lower die assembly (11) of the shaping station (45) is provided with a shaping inner top (47) and a shaping cavity mold (48); the shaping cavity mold (48) is sleeved on the shaping inner top (47); the shaping punch (46), the shaping inner top (47) and the shaping cavity mold (48) cooperate with each other to perform a stamping and shaping operation on the process blank (92).

5. The housing continuous stamping die according to claim 1, characterized in that: The lower die assembly (11) of the bulge station (50) is provided with a bulge lower punch (53) and a bulge inner top (54), wherein the bulge lower punch (53) is movably connected to the internal through hole of the bulge inner top (54) and punches the bottom of the process blank (92) upward to form a bulge (95) protruding upward; the upper die assembly (10) of the bulge station (50) is provided with a bulge upper punch (51) and a first chamfering punch (52), wherein the first chamfering punch (52) is movably connected to the internal through hole of the bulge upper punch (51) and punches the top of the bulge (95) to form a corresponding chamfer.

6. A shell continuous stamping die according to claim 5, characterized in that: The upper die assembly (10) of the punching station (60) is provided with a punching punch (61) and a stripping insert, wherein the punching punch (61) is movably connected to the internal through hole of the stripping insert, and the lower die assembly (11) of the punching station (60) is provided with a knife edge insert (63) and a punching cavity mold (64), wherein the knife edge insert (63) is movably connected to the internal through hole of the punching cavity mold (64), and the punching punch (61) and the knife edge insert (63) cooperate with each other to stamp out a through hole of the convex hump (95).

7. A shell continuous stamping die according to claim 6, characterized in that: The upper die assembly (10) of the tooth extraction station (70) is provided with a spring member (71), a tooth extraction push rod (72), a stripping push rod (73) and a stripping insert; the lower die assembly (11) of the tooth extraction station (70) is provided with a tooth extraction punch (75), a tooth extraction inner top (76) and a tooth extraction cavity mold (77); the stripping insert, the tooth extraction inner top (76) and the tooth extraction cavity mold (77) cooperate with each other to press the process blank (92); the tooth extraction push rod (72) and the tooth extraction punch (75) cooperate with each other to perform tooth extraction stamping on the through hole portion of the convex bulge (95), thereby stamping the convex bulge (95) portion into a bottom hole column (96) of the process blank (92).

8. The shell continuous stamping die according to claim 1, characterized in that: The upper die assembly (10) of the discharge station (80) is provided with a discharge punch (81) and a discharge insert (82), the discharge insert (82) being sleeved on the discharge punch (81), and the lower die assembly (11) of the discharge station (80) is provided with a discharge blade (83), the discharge punch (81) and the discharge blade (83) cooperate with each other to punch and discharge the process blank (92).

9. A shell continuous stamping die according to claim 6, characterized in that: The upper die assembly (10) between the punching station (60) and the thread extraction station (70) is provided with a second chamfering upper punch (15), and the corresponding lower die assembly (11) is provided with a second chamfering lower punch (16), and the second chamfering upper punch (15) and the second chamfering lower punch (16) cooperate with each other, so as to stamp and form a certain chamfer on the through hole portion of the convex bump (95).

10. The shell continuous stamping die according to claim 7, characterized in that: The upper die assembly (10) between the tooth extraction station (70) and the discharge station (80) is provided with a third chamfering upper punch (17), and the corresponding lower die assembly (11) is provided with a third chamfering lower punch (18). The third chamfering upper punch (17) and the third chamfering lower punch (18) cooperate with each other, so that both end edges of the bottom hole column (96) after the tooth extraction are stamped to have a certain chamfer.

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