CN214814113U - Forming die of high tensile straight wall square can - Google Patents

Abstract

The utility model discloses a forming die of high tensile straight wall square can, including the cup mould that dashes that sets gradually, stretch-forming die, flaring moulded die and trimming die, wherein dash the cup mould and be used for the section blanking of jar body material and tensile formation cup for the first time, the cup be cylinder and its section of thick bamboo wall for straight wall structure, the cross-sectional area of cup opening part is the same with cross-sectional area in the middle of the cup, it is equipped with jar body centre gripping conveyer to dash between cup mould, stretch-forming die, flaring moulded die and the trimming die. The utility model discloses an adopt the circular no flanging towards the cup mode of major diameter, make the mobility greatly increased of material, the tradition square can that has significantly reduced has wrinkled and tensile rupture problem towards the jar body material unstability that the tensile in-process of cup leads to easily, has very high practical value.

Description

Forming die of high tensile straight wall square can

Technical Field

The utility model belongs to the technical field of a cold stamping processing technique and specifically relates to a forming die of high tensile straight wall square can is related to.

Background

The metal package is used as a fast food for food, and the market development space is huge. The two cans are integrally formed by punching and drawing, and are more and more popular in the market due to the unique advantages and characteristics of the cans. On the other hand, with the push of the concept of light weight of products, the thickness of the material for forming the food can is continuously reduced, and on the premise of ensuring that various basic performance parameters of the food can meet requirements, the hardness of the material is inevitably required to be enhanced. However, in the case of a deep-drawn two-piece food can, the ratio of the height to the diameter (or the median of the width of the cross section of the body) is greater than 1, and since the degree of deformation is large during the forming, it is not possible to form the can by drawing at one time as can be seen from the theory of drawing deformation. At present, the commonly adopted drawing technical process is to design the tank wall into a cone shape, and adopt a blank pressing forming drawing process with a flange edge to gradually reduce the tank diameter until the tank is finally drawn and formed. When the mode is used for high (deep) stretching, the material is easy to crack due to the fact that the material is large in stretching deformation degree and blocked in material flowing, and the stretching coefficient is gradually reduced by a plurality of stations. Taking three-time stretch forming of the most common conical tank (a non-high stretching tank, the ratio of the height to the diameter (or the intermediate value of the width of the cross section of the main body) is usually less than 0.6) as an example, when a large-to-small stretching method is adopted, because the local blank holding area is limited, and the forming of the third process has a suspended area due to the fact that the straight-surface conversion conical surface forming exists, the tank body is easy to crack in the third process, and the unstable wrinkling phenomenon is generated at the transition fillet of the tank body. Meanwhile, the production process is complex, the requirement on production equipment is high, the number of equipment procedures is large, and the production investment and the cost are high. Particularly, for a high-tensile straight-wall square tank, the tank body is easy to crack or unstably wrinkle in the stretching process due to the larger deformation degree. Particularly, when a high-strength and low-elongation thinned material is used for stretch forming, how to solve the problem by using a new stretch forming process is a technical problem to be solved urgently by technical personnel in the field of canned food, and a solution to the problem is not searched in the existing published documents.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve prior art's high tensile straight wall square can and easily appear jar body when the punching press and break, and jar body transition fillet department produces the unstability phenomenon of corrugating and current multistation reduces stamping process in large quantity step by step, the production facility requires highly, production investment and problem with high costs, a forming die of high tensile straight wall square can is provided, under the prerequisite of guaranteeing conical tank each item performance requirement, can effectively solve jar body and break and the unstability problem of corrugating of transition fillet department, the production technology can be simplified simultaneously, reduce equipment quantity, reduce production investment and cost.

A forming die of a high-tensile straight-wall square can is suitable for the stretch forming of the straight-wall square can with the ratio of the height of the can body to the width of the cross section being more than 1, and comprises a cup punching die, a stretch forming die, a flaring forming die and a trimming die which are sequentially arranged, wherein the cup punching die is used for slicing, blanking and primary stretching of the can body material to form a cup body, the cup body is cylindrical, the wall of the cup body is of a straight-wall structure, the height of the cup body is 35-65% of the height of a finished can body, the diameter of the cup body is 1.7-2.3 times of the width of the middle cross section of the finished can body, the middle cross section area of the cup body is 85-90% of the middle cross section of the finished can body, and the cross section of the opening of the cup body is the same as the middle cross section of the cup body; the cup body forming device comprises a cup body punching die, a stretching forming die, a flaring forming die, a trimming die and a can body clamping and conveying device, wherein the cup body punching die, the stretching forming die, the flaring forming die and the trimming die are arranged on the cup body, the cup body is stretched for the second time to form a stretched can body, the flaring forming die is used for stretching and forming the stretched can body for the third time, the trimming die is used for trimming and trimming an outer flanging part at an opening of the formed can body to form a finished can body, and the can body clamping and conveying device is arranged among the cup punching die, the stretching forming die, the flaring forming die and the trimming die. During the stretching forming process of the tank body material, the sheet material is changed into a three-dimensional box-shaped member, and the edge parts of the male die and the female die have horizontal tensile force and vertical extrusion force, so that the tank body material has a wrinkling tendency. When the edge-holding force of the mold is insufficient, the edges of the can body material are liable to be unstably wrinkled, and this phenomenon is often improved by increasing the edge-holding force. However, in order to reduce the production cost and improve the product competitiveness, manufacturers use high-hardness and low-ductility can body materials, and if the traditional flat edge pressing mode is adopted, the workpiece is easy to stretch and break by continuously improving the edge pressing force. The cup punching process of the utility model changes the mode of the wide flanging square cup body which is usually adopted in the past square can forming, the large-diameter straight-wall round can-shaped cup body without the flanging is adopted, the structure without the flanging relieves the limitation of blank holder stretching on the material flowability, greatly increases the material flowability, the large-diameter circular structure ensures that the tank body material in the cup punching stage is uniformly stressed on the tank wall, the problem of instability wrinkling or tensile fracture is not easy to occur, the molded cup body is fully expanded, the deformation of the subsequent stretching process is relatively less, therefore, the problems that the tank body material has the tendency of wrinkling and is easy to cause unstable wrinkling and tensile rupture of the tank body material due to the fact that the horizontal tensile force and the vertical extrusion force exist at the edge parts of the male die and the female die in the punching and cup stretching process of the traditional square tank are greatly reduced.

Preferably, the punching die is a blanking forming compound die and comprises a punching cup lower die plate used for supporting, a punching cup lower cylinder arranged in the punching cup lower die plate, a piston of the punching cup lower cylinder is connected with a punching cup ejection ring through a punching cup ejection rod, a punching cup lower die seat used for fixing a punching cup lower die core, a punching cup fixing seat used for fixing a punching cup female die, a punching cup upper die core connected with a punching cup upper cylinder is arranged in the center of the punching cup convex-concave die, a punching cup unloading ring is arranged on the periphery of the punching cup convex-concave die, the punching cup unloading ring is fixed with a punching cup upper die seat used for fixing a punching cup upper die through a spring, and the punching cup upper die seat is arranged on the punching cup upper die plate. The lower punching cup template is used for supporting the whole punching cup die and is a bottom plate of the punching cup die, the lower punching cup die holder is used for fixing the lower punching cup die, the upper punching cup template is a bottom plate for fixing the upper punching cup die, and the upper punching cup die holder is used for fixing the upper punching cup die; the lower punching cup cylinder provides blank pressing force, a blank pressing device is formed by the lower punching cup cylinder, the punching cup ejector rod, the punching cup ejector ring and the like, the blank pressing function is realized, and the blank pressing force is adjusted by adjusting the entering air pressure of the lower punching cup cylinder; the punching cup fixing seat mainly has the main functions of fixing a punching cup female die, adjusting the height of a blanking plane of the punching cup female die and providing a forming space, the punching cup female die is matched with the punching cup male and female die, under the action of a power source, a sheet material is punched, the blanking function is realized, and a punching cup discharging ring pushes out waste materials so that the waste material ring is not sleeved on the punching cup male and female die; after the blanking action is finished, the punching cup punch-die continues to move downwards under the action of a power source and interacts with the punching cup lower die core to stretch the sheet material for forming, the punching cup upper die continues to move upwards to the upper dead point under the action of power, the punching cup lower die recovers, and the one-time punching process is finished.

Preferably, the stretching forming die comprises a stretching lower die base and a stretching male and female die arranged on the stretching lower die base, a stretching positioning ring is formed on the periphery of the upper end of the stretching male and female die, the stretching lower die core and a stretching piston rod connected with the stretching lower die core are arranged in the center of the stretching male and female die, the stretching ejection ring and the stretching ejector rod are arranged in a stretching fixing ring, the stretching fixing ring is arranged on the stretching upper die base, and the stretching die core is arranged in the center of the stretching ejection ring. The stretching forming die comprises primary forming of sinking planes on the tank wall reinforcing ribs and the tank bottom, and forming flanging at the tank opening, wherein the stretching tank body is in a cuboid shape, the tank wall of the stretching tank body is in a straight wall structure, the height of the stretching tank body is 75-85% of the height of the finished tank body, the middle cross-sectional area of the stretching tank body is 90-95% of the middle cross-sectional area of the finished tank body, and the flanging width of the stretching tank body is 10-15 times of the flanging width of the finished tank body.

The cross-sectional area is reduced on the basis of the cup body in the first cup punching process, the second stretching of the stretching height is increased, and the forming of the tank wall reinforcing rib part and the tank bottom sinking plane is required to be completed after the stretching is completed, so that the forming key process of the high-stretch tank is realized. The utility model discloses a transition fillet shaping unstability phenomenon of wrinkling is eliminated to the blank pressing, compromises the conversion station location problem between the mould process simultaneously, adopts the stretch forming mode of the gradual increase jar body height of class. According to the stretching principle, the technical scheme can effectively solve the problem of instability and wrinkling of the tank body under the conditions of increasing the transition fillet of the female die, reducing the surface roughness of the die, increasing the lubrication of materials and slowing down the stretching speed, and simultaneously ensures various performance requirements of the tank body.

Preferably, the flaring forming die comprises a flaring lower die base and a flaring punch-die arranged on the flaring lower die base, a flaring lower die core connected with a flaring piston rod is arranged in the center of the flaring punch-die, a flaring material pushing ring and a flaring ejector rod are both arranged in a flaring fixing ring, a flaring upper die core is arranged in the center of the flaring material pushing ring, and the flaring fixing ring is arranged on the flaring upper die base. The flaring forming die comprises the final forming of the tank wall reinforcing rib and the tank bottom reinforcing rib, the flaring and the flanging fillet forming at the opening end of the tank body, the height of the formed tank body after the flaring forming is the same as that of the finished tank body, the middle cross-sectional area of the formed tank body is the same as that of the finished tank body, and the flanging width of the formed tank body is 4-7 times of that of the finished tank body; the structure of the flaring forming die and the principle of preventing the tank body from unstability and wrinkling are similar to those of the stretching forming die.

Preferably, the trimming die comprises a trimming lower die holder and a trimming female die arranged on the trimming lower die holder, the trimming positioning upper die core is fixed on the trimming upper die holder, a trimming fixing ring is fixed on the trimming upper die holder, the trimming pressing ring is arranged in the trimming fixing ring, and the trimming male die is arranged in the trimming pressing ring and positioned on the outer side of the trimming positioning upper die core. And the trimming die is used for trimming and trimming the flanging part at the opening of the formed tank body, and the width and the fillet structure of the flanging of the finished tank body after trimming and trimming meet the tank cover matching requirements of double seaming.

Preferably, the cup punching die is of an independent structure, the stretch forming die, the flaring forming die and the trimming die are arranged on the same die frame to form a progressive forming die, the die frame comprises a die frame lower template used for fixing the lower die and a die frame upper template used for fixing the upper die, the die frame lower template is provided with a transition plate, and the die frame upper template is provided with a die frame cylinder. The operation principle of the progressive forming die is as follows: under the action of a power source, an upper template of a die frame drives upper dies of the three dies to move downwards, a stretching female die of a stretching forming die and a stretching lower die core act to complete a stretching forming process, and tank wall reinforcing ribs and tank bottom sinking plane forming are completed at a lower dead point; the flaring female die of the flaring forming die and the flaring lower die core act to complete the flaring forming process; the trimming positioning upper die core of the trimming die is used for positioning the trimming tank body, then the trimming male die continues to move downwards to be matched with the trimming female die to finish trimming, the finished tank body after trimming falls into the trimming lower die seat and is sent out of the working range of the die, and the forming upper die plate drives the upper dies of the three dies to move upwards to the upper dead point, so that the one-step forming process is finished.

As another alternative, the cup punching die, the stretch forming die, the flaring forming die and the trimming die are all independent structures. The processes are independent, power sources are used respectively, the purpose of product forming can be achieved, and only the power sources are added and independent die structures are adopted.

The utility model discloses to the shaping of two square jars of high tensile straight wall, through adopting the straight wall that does not take flanging to dash the cup, then the shaping is reduced to spacing formula to accomplish jar body essential part basically, flaring forming die adopts the envelope shaping, and the downward envelope shaping oral area shaping of material reduces the influence of tensile process to jar oral area, guarantees the stability of size and avoids the unstability of tensile process to corrugate. The limited stretch forming is carried out after the cup punching, the enveloping forming of the opening part is favorable for controlling the material flow trend, and finally a straight-wall tank body is formed, wherein the straight wall refers to that the main part (excluding the flaring part of the tank opening) of the tank body is vertical to the plane of the tank bottom, so that the instability wrinkling and the common cracking problems in the forming process of the high-stretch two-piece tank are solved, on the premise of ensuring various performance requirements of the conical tank, the problems of tank body cracking and transition fillet instability wrinkling are effectively solved, the production process can be simplified, the equipment quantity is reduced, and the production investment and the cost are reduced.

The utility model discloses a jar body stretch forming process includes the shaping of can body transition structure, in addition the utility model discloses do not describe the jar body centre gripping conveyer that the mould used in the course of the work in detail, this part content belongs to prior art. Meanwhile, the present invention expresses the corresponding mold structure through the definition of the tank structure (such as height, cross-sectional area, etc.), which is fully understood by those skilled in the art.

The utility model has the advantages that: it has solved prior art's high tensile straight wall square can easily appear jar body when the punching press effectively and has broken, and jar body transition fillet department produces the unstability phenomenon of corrugating and current multistation reduces stamping process quantity step by step many, and the production facility requires highly, and the problem of production investment and high cost, the utility model discloses a forming die of high tensile straight wall square can, under the prerequisite of guaranteeing conical tank each item performance requirement, can effectively solve the jar body and break and the unstability problem of corrugating of transition fillet department, can simplify production technology simultaneously, reduce equipment quantity, reduction production investment and cost have very high practical value.

Drawings

Fig. 1 is a schematic diagram showing structural changes of a tank body corresponding to a forming die of the present invention;

FIG. 2 is a schematic structural view of the cup punching die of the present invention;

fig. 3 is a schematic structural view of the stretch forming die of the present invention;

fig. 4 is a schematic structural diagram of a flaring forming die of the present invention;

FIG. 5 is a schematic structural view of the trimming die of the present invention;

FIG. 6 is a schematic structural view of the progressive die of the present invention;

FIG. 7 is a schematic structural view of a progressive die set of the present invention;

fig. 8 is a schematic structural view of the finished can body of the present invention.

In the figure: I. a cup punching die, a II progressive forming die, a III stretching forming die, an IV flaring forming die, a V trimming die, a VI die carrier, a cup body, a 2 stretching can body, a 3 flaring can body, a 4 finished can body, an outward flanging, a 6 flaring, a 7 die carrier lower template, an 8 transition plate, a 9 die carrier cylinder, a 10 die carrier upper template, a 11 cup punching lower template, a 12 cup punching lower cylinder, a 13 cup punching lower template, a 14 cup punching ejector rod, a 15 cup punching fixing seat, a 16 cup punching female die, a 17 cup punching ejector ring, a 18 cup punching lower die core, a 19 cup punching discharging ring, a 20 cup punching convex-concave die, a 21 cup punching upper die core, a 22 cup punching upper die base, a 23 cup punching upper template, a 24 cup punching upper cylinder, a 25 spring, a 26 can wall reinforcing rib, a 27 can bottom sinking plane, a 28 convex edge, a 29 cup stretching lower template, a 32 a stretching positioning ring, 33. the die comprises a drawing punch-die, a drawing lower die core, a drawing piston rod, a drawing ejection ring, a drawing ejector rod, a drawing fixed ring, a drawing die core, a drawing upper die holder, a flaring lower die holder, a flaring punch-die, a flaring lower die core, a flaring piston rod, a flaring ejection ring, a flaring ejector rod, a flaring upper die core, a flaring fixed ring, a flaring upper die holder, a flaring die holder, a trimming die holder, a flaring positioning upper die core, a trimming punch, a trimming press ring, a trimming fixed ring, a trimming die holder and a die holder.

Detailed Description

The following provides a further description of the embodiments of the present invention with reference to the accompanying drawings.

Example 1

In embodiment 1 shown in fig. 1, a mold for molding a high-tensile straight-walled square can, comprising:

the cup punching die I (shown in figure 2) is applied to a blanking and cup punching process and is used for slicing and blanking tank body materials and performing first-time stretching to form a cup body 1, the cup body after the first-time stretching is cylindrical, the wall of the cup body is of a straight wall structure, the height of the cup body is 50% of the height of a finished tank body, the diameter of the cup body after the first-time stretching is 2 times of the width of the middle cross section of the finished tank body, the middle cross section area of the cup body after the first-time stretching is 87% of the middle cross section area of the finished tank body, and the cross section area of an opening of the cup body after the first-time stretching is the same as the middle cross section area of the cup body.

Stretch forming die III (see fig. 3), be applied to the stretch forming process for the cup after the first time is stretched and is formed tensile jar body 2 for the second time, include and sink into the primary forming (see fig. 8) of plane 27 at jar wall strengthening rib 26 and tank bottoms, and form flanging 5 at the jar mouth, tensile jar body is cuboid shape and its jar wall is straight wall structure, wherein the tank bottoms sinks into planar periphery and forms chimb 28, and the chimb is equipped with the breach 29 that is used for dodging the easy-open end pull ring near jar body length direction's both ends. The height of the stretched tank body after the second stretching is 80 percent of the height of the finished tank body 4, the middle cross-sectional area of the stretched tank body after the second stretching is 92 percent of the middle cross-sectional area of the finished tank body, and the flanging width of the stretched tank body after the second stretching is 12 times of the flanging width of the finished tank body.

And the flaring forming die IV (see figure 4) is applied to a flaring forming process and is used for carrying out third-time stretching forming on the stretched tank body after the second stretching to form a formed tank body 3, and comprises the final forming of tank wall reinforcing ribs and tank bottom reinforcing ribs, the forming of a flaring 6 and a flanging fillet at the opening end of the tank body, the height of the formed tank body after the third stretching is the height of the finished tank body, the middle cross-sectional area of the formed tank body is the middle cross-sectional area of the finished tank body, and the flanging width of the formed tank body after the third stretching is 4.5 times of the flanging width of the finished tank body.

And the trimming die V (shown in figure 5) is used for trimming and trimming the flanging part at the opening of the formed tank body, and the width and the fillet structure of the flanging of the finished tank body after trimming and trimming meet the matching requirement of the tank cover of double seaming.

The punching cup die I is a blanking forming compound die and comprises a punching cup lower die plate 11 used for supporting, a punching cup lower cylinder 12 arranged in the punching cup lower die plate, a piston of the punching cup lower cylinder is connected with a punching cup ejection ring 17 through a punching cup ejection rod 14, a punching cup lower die base 13 used for fixing a punching cup lower die core 18, a punching cup fixing base 15 used for fixing a punching cup female die 16, a punching cup upper die core 21 connected with a punching cup upper cylinder 24 is arranged in the center of a punching cup convex-female die 20, a punching cup unloading ring 19 is arranged on the periphery of the punching cup convex-female die, the punching cup unloading ring is fixed with a punching cup upper die base 22 used for fixing a punching cup upper die through a spring 25, and the punching cup upper die base is arranged on the punching cup upper die plate 23.

The stretching forming die III comprises a stretching lower die base 31 and a stretching male and female die 33 arranged on the stretching lower die base, a stretching positioning ring 32 is formed on the periphery of the upper end of the stretching male and female die, a stretching lower die core 34 and a stretching piston rod 35 connected with the stretching lower die core are arranged in the center of the stretching male and female die, a stretching ejection ring 36 and a stretching ejection rod 37 are arranged in a stretching fixing ring 38, the stretching fixing ring is arranged on a stretching upper die base 40, and a stretching die core 39 is arranged in the center of the stretching ejection ring.

The flaring forming die IV is used for the flaring forming process of the tank body and comprises a flaring lower die holder 41 and a flaring punch-die 42 arranged on the flaring lower die holder, the center of the flaring punch-die is provided with a flaring lower die core 43 connected with a flaring piston rod 44, a flaring ejector ring 45 and a flaring ejector rod 46 are both arranged in a flaring retainer ring 48, the center of the flaring ejector ring is provided with a flaring upper die core 47, and the flaring retainer ring is arranged on a flaring upper die holder 49.

The trimming die V comprises a trimming lower die holder 51 and a trimming female die 52 arranged on the trimming lower die holder, the trimming positioning upper die core 53 is fixed on a trimming upper die holder 57, a trimming fixing ring 56 is fixed on the trimming upper die holder, a trimming pressure ring 55 is arranged in the trimming fixing ring, and a trimming male die 54 is arranged in the trimming pressure ring and positioned outside the trimming positioning upper die core.

The cup punching die of the embodiment is of an independent structure, the stretch forming die, the flaring forming die and the trimming die are arranged on the same die carrier VI to form a progressive forming die II (see fig. 6), the die carrier comprises a die carrier lower template 7 for fixing a lower die and a die carrier upper template 10 for fixing an upper die, the die carrier lower template is provided with a transition plate 8, the die carrier upper template is provided with a die carrier cylinder 9 (see fig. 7), and a tank body clamping and conveying device (not shown in the figure) is arranged among the cup punching die, the stretch forming die, the flaring forming die and the trimming die.

Example 2

The cup punching die, the stretch forming die, the flaring forming die and the trimming die in the embodiment 2 are all independent structures, and the can body clamping and conveying device is arranged among the cup punching die, the stretch forming die, the flaring forming die and the trimming die, and the rest is the same as the embodiment 1.

During the stretching forming process of the tank body material, the sheet material is changed into a three-dimensional box-shaped member, and the edge parts of the male die and the female die have horizontal tensile force and vertical extrusion force, so that the tank body material has a wrinkling tendency. When the edge-holding force of the mold is insufficient, the edges of the can body material are liable to be unstably wrinkled, and this phenomenon is often improved by increasing the edge-holding force. However, in order to reduce the production cost and improve the product competitiveness, manufacturers use high-hardness and low-ductility can body materials, and if the traditional flat edge pressing mode is adopted, the workpiece is easy to stretch and break by continuously improving the edge pressing force. The cup punching process of the utility model changes the mode of the wide flanging square cup body which is usually adopted in the past square can forming, the large-diameter straight-wall round can-shaped cup body without the flanging is adopted, the structure without the flanging relieves the limitation of blank holder stretching on the material flowability, greatly increases the material flowability, the large-diameter circular structure ensures that the tank body material in the cup punching stage is uniformly stressed on the tank wall, the problem of instability wrinkling or tensile fracture is not easy to occur, the molded cup body is fully expanded, the deformation of the subsequent stretching process is relatively less, therefore, the problems that the tank body material has the tendency of wrinkling and is easy to cause unstable wrinkling and tensile rupture of the tank body material due to the fact that the horizontal tensile force and the vertical extrusion force exist at the edge parts of the male die and the female die in the punching and cup stretching process of the traditional square tank are greatly reduced.

In addition to the above embodiments, the technical features or technical data of the present invention can be selected and combined again within the scope disclosed in the claims and the specification of the present invention to constitute a new embodiment, and those embodiments not described in detail in the present invention can be easily implemented by those skilled in the art without creative efforts, so that those embodiments not described in detail should be regarded as specific embodiments of the present invention and are within the protection scope of the present invention.

Claims (7)

1. A forming die of a high-tensile straight-wall square can is suitable for the stretch forming of the straight-wall square can with the ratio of the height of the can body to the width of the cross section of more than 1, and is characterized by comprising a cup punching die (I), a stretch forming die (III), a flaring forming die (IV) and a trimming die (V) which are sequentially arranged, wherein the cup punching die is used for slicing, blanking and primary stretching of the can body material to form a cup body (1), the cup body is cylindrical, the wall of the cup body is of a straight-wall structure, the height of the cup body is 35-65% of the height of a finished can body (4), the diameter of the cup body is 1.7-2.3 times of the width of the middle cross section of the finished can body, the middle cross section area of the cup body is 85-90% of the middle cross section area of the finished can body, and the cross section area of an opening of the cup body is the same as the middle cross section area of the cup body; the stretching forming die is used for carrying out secondary stretching on the cup body after the primary stretching to form a stretching tank body (2), the flaring forming die is used for carrying out tertiary stretching forming on the stretching tank body after the secondary stretching to form a forming tank body (3), the trimming die is used for trimming and trimming the flanging part at the opening of the forming tank body to form a finished tank body, and a tank body clamping and conveying device is arranged among the cup punching die, the stretching forming die, the flaring forming die and the trimming die.

2. The forming mold of the high-tensile straight-wall square can according to claim 1, the punching cup die (I) is a blanking forming compound die and comprises a punching cup lower die plate (11) used for supporting and a punching cup lower cylinder (12) arranged in the punching cup lower die plate, a piston of the punching cup lower cylinder is connected with a punching cup material ejection ring (17) through a punching cup ejector rod (14), a lower punching cup die holder (13) for fixing a lower punching cup die core (18), a punching cup fixing holder (15) for fixing a punching cup concave die (16), an upper cup punching mold core (21) connected with an upper cup punching cylinder (24) is arranged in the center of a cup punching convex-concave mold (20), a cup punching discharging ring (19) is arranged on the periphery of the cup punching convex-concave mold, the cup punching discharging ring is fixed with an upper cup punching mold base (22) used for fixing an upper cup punching mold through a spring (25), and the upper cup punching mold base is arranged on an upper cup punching mold plate (23).

3. The forming die of the high-tensile straight-wall square can according to claim 1, wherein the stretch forming die (III) comprises a lower stretch die holder (31) and a stretch punch-die (33) arranged on the lower stretch die holder, a stretch positioning ring (32) is formed on the upper end periphery of the stretch punch-die, a lower stretch die core (34) and a stretch piston rod (35) connected with the lower stretch die core are arranged in the center of the stretch punch-die, a stretch ejection ring (36) and a stretch ejector rod (37) are arranged in the stretch fixing ring (38), the stretch fixing ring is arranged on an upper stretch die holder (40), and a stretch die core (39) is arranged in the center of the stretch ejection ring.

4. The forming die of the high-tensile straight-wall square can according to claim 1, characterized in that the flaring forming die comprises a flaring lower die holder (41) and a flaring punch-die (42) arranged on the flaring lower die holder, a flaring lower die core (43) connected with a flaring piston rod (44) is arranged in the center of the flaring punch-die, a flaring ejector ring (45) and a flaring ejector rod (46) are both arranged in a flaring retainer ring (48), a flaring upper die core (47) is arranged in the center of the flaring ejector ring, and the flaring retainer ring is arranged on a flaring upper die holder (49).

5. The forming die of the high-tensile straight-wall square can according to claim 1, wherein the trimming die (V) comprises a trimming lower die holder (51) and a trimming female die (52) arranged on the trimming lower die holder, the trimming positioning upper die core (53) is fixed on the trimming upper die holder (57), a trimming fixing ring (56) is fixed on the trimming upper die holder, the trimming pressing ring (55) is arranged in the trimming fixing ring, and the trimming male die (54) is arranged in the trimming pressing ring and positioned outside the trimming positioning upper die core.

6. The forming die of the high-tensile straight-wall square can according to any one of claims 1 to 5, characterized in that the punching cup die is of an independent structure, the stretch forming die, the flaring forming die and the trimming die are arranged on the same die carrier (VI) to form a progressive forming die (II), the die carrier comprises a die carrier lower template (7) for fixing the lower die and a die carrier upper template (10) for fixing the upper die, the die carrier lower template is provided with a transition plate (8), and the die carrier upper template is provided with a die carrier cylinder (9).

7. The forming die for the high-tensile straight-wall square can according to any one of claims 1 to 5, wherein the punching die, the stretch forming die, the flaring forming die and the trimming die are all independent structures.

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