Multi-station small stainless steel thin-wall stretching forming die

Abstract

The utility model discloses a multi-station small stainless steel thin-wall drawing forming die, which relates to the technical field of dies, and is characterized in that four first notches and four second notches are respectively formed in the outer edges of a first punching column and a second punching column; eight connecting positions are formed on the material belt, it can be guaranteed that the material belt cannot be broken in the punching process, when the stretching work is conducted through the stretching blocks and the corresponding punching grooves subsequently, materials can be protected from being separated from the material belt while freely flowing when the middle part of the inner ring is stretched, and due to the fact that the eight connecting positions are evenly distributed, the material belt can be prevented from being broken. Compared with the prior art that a plurality of circular plates are punched out of the material belt firstly and then the circular plates are stretched, the continuous punching, stretching and blanking processing of the material belt is realized, the troubles of step-by-step work, need of a plurality of sets of dies and transfer are avoided, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a multi-station small stainless steel thin-wall stretching mold. Background Art

[0002] like Figure 8 As shown, at present, for some small-sized, high-precision small barrel-type hardware parts, such as small motor housings, the production needs to go through multiple processes such as cutting, feeding, and stamping, and these processes require multiple sets of blanking equipment to complete. For example, cutting requires a special cutting die, and stamping requires a special stamping die. In addition, the metal plate cut by the cutting die needs to be manually transferred to the stamping die for stamping.

[0003] The above production method has low production efficiency for small motor housings, which will increase the company's production costs and labor intensity. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a multi-station small stainless steel thin-wall stretching forming die to solve the problem that the existing production method has low production efficiency for small motor housings, which increases the production cost and labor intensity of the enterprise.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a multi-station small stainless steel thin-wall stretching forming mold, comprising an upper template and a lower template, the bottom surface of the upper template is provided with at least one group of punches, each group of punches includes a first punching column, a second punching column, a stretching block and a shearing block arranged in sequence along the length direction of the upper template, the top surface of the lower template is provided with at least one group of punch grooves adapted to the punches, the size of the second punching column is larger than that of the first punching column, the outer edge of the first punching column is provided with four first notches equidistantly around the circumference, the outer edge of the second punching column is provided with four second notches equidistantly around the circumference, and the angle between the extension line of the line connecting the two opposite first notches and the extension line of the line connecting the two opposite second notches is 45° or 135°.

[0006] Preferably, there are three groups of punches and grooves, and the three groups of punches are arranged in parallel. The lines between the center points of the three first shearing columns, the three second shearing columns, the three stretching blocks and the three shearing blocks are all arranged in an isosceles triangle. The two base angles of the isosceles triangle are 30°, and the base of the isosceles triangle is perpendicular to the length direction of the upper template. The distance between the center points of the first shearing column and the second shearing column of each group of punches is at least twice the waist length of the isosceles triangle.

[0007] Preferably, the diameter of the second punching column is 2 mm larger than that of the first punching column, and the line connecting the center points of the first punching column and the second punching column of each group of punches is parallel to the length direction of the upper template.

[0008] Preferably, the punching groove includes a first punching groove, a second punching groove, a stretching groove and a shearing groove which are opened in sequence along the length direction of the lower template. A first elastic member is provided on the bottom surface of the stretching groove. A first top block is fixedly installed on the top of the first elastic member. When the first elastic member is at its original length, the height position of the top surface of the first top block is not lower than the height position of the notch of the stretching groove.

[0009] Preferably, a second elastic member is provided on the bottom surface of the inner wall of the first punching groove, and a second top block is fixedly installed on the top of the second elastic member. When the second elastic member is at its original length, the height position of the top surface of the second top block is not lower than the height position of the notch of the first punching groove.

[0010] Preferably, a third elastic member is provided on the bottom surface of the inner wall of the second punching groove, and a third top block is fixedly installed on the top of the third elastic member. When the third elastic member is at its original length, the height position of the top surface of the third top block is not lower than the height position of the notch of the second punching groove.

[0011] Preferably, the top surfaces of the first top block, the second top block, the third top block, and the bottom surfaces of the first punching column, the second punching column, the stretching block and the blanking block are all provided with ventilation holes.

[0012] The top end face of the movable column is fixedly mounted on the top of the movable column, and a limit post is fixedly installed on the bottom surface of the movable column for rotation. Side grooves are provided on both sides of the movable column symmetrically facing one side and an through hole is provided on the bottom surface of the side groove. A plurality of limit posts adapted for the through holes are symmetrically provided on both sides of the bottom surface of the upper template along its length direction and the height position of the bottom end of the limit post is lower than the height position of the bottom surface of the upper template. When the fourth elastic member is in its original length, the height position of the bottom surface of the side groove is higher than the height position of the top surface of the lower template, the first top block, the second top block and the third top block. When the fourth elastic member is in a fully compressed state, the height position of the bottom surface of the side groove is not higher than the height position of the top surface of the lower template.

[0013] Preferably, the blanking block includes a shaping column and a blanking column, the cross-sectional size of the shaping column is smaller than the cross-sectional size of the blanking column, and the cross-sectional size of the blanking column is adapted to the size of the notch of the blanking groove.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) The forming die forms eight connections on the material strip by respectively opening four first notches and four second notches on the outer edges of the first punching column and the second punching column, which can ensure that the material strip will not be broken during the punching process. When the stretching work is subsequently performed through the stretching block and the corresponding punching groove, the material in the middle part of the inner ring can be protected from free flow while not being separated from the material strip during stretching. Since the eight connections are evenly distributed, the connections will not be broken. After stretching, the material strip presents a petal-like shape, thereby realizing continuous punching, stretching and blanking processing of the material strip. Compared with the existing method of first punching out a number of circular plates from the material strip and then stretching the circular plates, this method avoids the trouble of working in steps, requiring multiple sets of molds and transportation, thereby improving production efficiency and reducing the production cost and labor intensity of the enterprise.

[0016] (2) The distance of each step of the material strip and the distance between the center points of the first punching column and the second punching column of each group of punches are set to the waist length of an isosceles triangle, and the two base angles of the isosceles triangle are 30°. In this way, the connection line between the center points of the three first punching columns, the three second punching columns, the three stretching blocks and the three punching blocks is perpendicular to the long side of the lower template, which can not only effectively reduce the width of the material strip and prevent the material strip from being bent during transportation due to being too wide, but also effectively improve the utilization rate of the material strip, reduce the gap between the small barrels finally formed, avoid material waste, and further reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the upper template, top plate, first punching column, second punching column, stretching block, punching block and first shear plate of the utility model;

[0019] Figure 3 This is a schematic diagram of the first punching column, the second punching column, the first notch, the second notch and the vent hole structure of the utility model;

[0020] Figure 4 This is a schematic diagram of the lower template, the first punching groove, the second punching groove, the stretching groove, the blanking groove, and the second shear plate structure of the utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the lower template, the first top block, the stretching groove and the spring positioning pin of the utility model;

[0022] Figure 6 This is a schematic diagram of the structure of the blanking block of the utility model;

[0023] Figure 7This is a structural diagram of the small barrel forming process of the utility model;

[0024] Figure 8 It is a schematic diagram of the structure of a small barrel;

[0025] Among them: 1. Upper template; 11. First punching column; 111. First notch; 12. Second punching column; 121. Second notch; 13. Stretching block; 14. Punching block; 141. Punching column; 142. Shaping column; 15. First shearing plate; 16. Positioning punching column; 2. Lower template; 21. First punching groove; 211. Second top block; 22. Second punching groove; 221. Third top block; 23. Stretching groove; 24. Punching groove; 25. Second shearing plate; 26. Reserved hole; 3. Spring locating pin; 31. Movable column; 311. Side groove; 312. Through hole; 32. Limiting column; 4. First top block; 5. Top plate; 6. Bottom plate; 7. Finished product guide plate; 8. Waste guide plate; 9. Ventilation hole. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific embodiments. However, the following embodiments are only preferred embodiments of the present invention, not all of them. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without making any creative work shall fall within the scope of protection of the present invention.

[0027] like Figures 1-4 and Figure 7 As shown, the utility model provides a multi-station small stainless steel thin-wall stretching forming die, comprising an upper template 1 and a lower template 2, the top surface of the upper template 1 is provided with a top plate 5, the top surface of the top plate 5 is provided with a driving cylinder (not shown in the figure) for driving its lifting movement, the bottom surface of the upper template 1 is provided with at least one group of punches, each group of punches includes a first punching column 11, a second punching column 12, a stretching block 13 and a punching block 14 arranged in sequence along the length direction of the upper template 1, the top surface of the lower template 2 is provided with at least one group of punching grooves adapted to the punches, the size of the second punching column 12 is larger than that of the first punching column 11, the outer edge of the first punching column 11 is provided with four first notches 111 equidistantly around the circumference, the outer edge of the second punching column 12 is provided with four second notches 121 equidistantly around the circumference, and the angle between the extension line of the line connecting the two opposite first notches 111 and the extension line of the line connecting the two opposite second notches 121 is 45° or 135°;

[0028] This time, the automatic equal-pitch feeding of the material strip can be completed by setting up a three-in-one feeding device for the material strip (the three-in-one feeding device includes a stainless steel coil rack, a flattening machine and a feeder, which are all existing technologies and will not be described in detail here);

[0029] By setting four first notches 111 and four second notches 121, eight connection points are formed on the material strip during the process of the first punching column 11 and the second punching column 12 punching the material strip. The forming mold continuously punches, stretches and blanks the material strip. The first notches 111 and the second notches 121 are respectively opened on the outer edges of the first punching column 11 and the second punching column 12 to ensure that the material strip will not be broken during the punching process, and the following connection points are formed on the material strip: Figure 7 The two forms of a (here defined as the inner ring) and b (here defined as the outer ring) shown in the figure can protect the inner ring from being separated from the strip while the material flows freely during the stretching process through the stretching block 13 and the corresponding punching groove. Since the eight joints are evenly distributed, the joints will not break. After stretching, the strip presents a petal-like shape. After stretching, the strip is formed as shown in FIG. Figure 7 Compared with the existing method of punching out a number of circular plates from a strip and then stretching the circular plates, the c-shape shown avoids the trouble of working in steps, requiring multiple sets of molds and transporting, thereby improving production efficiency and reducing the company's production costs and labor intensity.

[0030] When the number of the first notches 111 and the second notches 121 is less than four, the material strip will be subjected to uneven force during punching and subsequent stretching, causing the material strip to deform or be broken, making it difficult to achieve automatic feeding. When the number of the first notches 111 and the second notches 121 is more than four, the material strip will not be able to enter the corresponding punching groove in time during the stretching work, which will cause the final stretched product to be damaged.

[0031] like Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 as well as Figure 7 As shown, here, an example is given in which there are three groups of punches and three groups of punches. The three groups of punches are arranged in parallel. The lines connecting the center points of the three first punching columns 11, the three second punching columns 12, the three stretching blocks 13 and the three punching blocks 14 are all arranged in an isosceles triangle. The two base angles of the isosceles triangle are 30°. The base of the isosceles triangle is perpendicular to the length direction of the upper template 1. The distance between the center points of the first punching column 11 and the second punching column 12 of each group of punches is at least twice the waist length of the isosceles triangle.

[0032] Here, the distance of each step of the material strip and the distance between the center points of the first punching column 11 and the second punching column 12 of each group of punches are set to be the waist length of an isosceles triangle, and the two base angles of the isosceles triangle are 30°. In this way, the line between the center points of the three first punching columns 11, the three second punching columns 12, the three stretching blocks 13 and the three punching blocks 14 is perpendicular to the long side of the lower template 2 (not shown in the figure), which can not only effectively reduce the width of the material strip and prevent the material strip from being bent during transportation due to being too wide, but also effectively improve the utilization rate of the material strip, reduce the gap between the small barrels finally formed, avoid material waste, and further reduce production costs;

[0033] Two sets of punches can also be provided here, and the extended lines of the connection lines between the two first punching columns 11 and the two second punching columns 12 of the two sets of punches are all at an angle of 60° with the long side of the upper template 1. Compared with the provision of three sets of punches, the production efficiency is reduced;

[0034] Similarly, four sets of punches can also be set, that is, the above-mentioned two sets of punches are set as two pairs. Although this method can further improve production efficiency, the required width of the material strip is relatively wide, so that during the equidistant conveying of the material strip, the material strip will bend (the material strip may detach from the subsequent movable column 31), thereby failing to ensure accurate conveying of the material strip, resulting in the inability to accurately perform punching, stretching and blanking work, resulting in the inability to produce complete products. Therefore, it is best to set three sets of punches, which can ensure both production efficiency and production quality.

[0035] like Figure 4 As shown, the lower template 2 is further provided with a plurality of reserved holes 26 , which are located between the stretching groove 23 and the punching groove 24 , so that when multiple stretching operations are required, multiple stretching blocks 13 can be provided at positions corresponding to the reserved holes 26 on the bottom surface of the upper template 1 .

[0036] like Figure 2 、 Figure 3 and Figure 7 As shown, the diameter of the second punching column 12 is 2 mm larger than that of the first punching column 11. The line between the center points of the first punching column 11 and the second punching column 12 of each punch set is parallel to the length direction of the upper template 1, ensuring that after the first punching column 11 and the second punching column 12 punch, concentric circle punch marks are formed on the material strip (such as Figure 7 a and b);

[0037] By setting the diameter of the second punching column 12 to be 2 mm larger than the diameter of the first punching column 11, it is ensured that the subsequent stretching work can be carried out normally without wasting materials. When the diameter of the second punching column 12 is larger than the diameter of the first punching column 11 by 2 mm, it will cause waste of raw materials. When the diameter of the second punching column 12 is smaller than the diameter of the first punching column 11 by 2 mm, the eight connections in the punching process will be broken during the subsequent stretching process, making it impossible to accurately achieve the subsequent stretching and blanking work.

[0038] like Figure 2 、 Figure 4 and Figure 5 As shown, the punching groove includes a first punching groove 21, a second punching groove 22, a stretching groove 23 and a shearing groove 24 which are sequentially opened along the length direction of the lower template 2. A first elastic member is provided on the inner bottom surface of the stretching groove 23. A first top block 4 is fixedly installed on the top of the first elastic member. When the first elastic member is at its original length, the top surface height of the first top block 4 is not lower than the height of the notch of the stretching groove 23.

[0039] This time, the top surface height position of the first top block 4 is set to be flush with the height position of the notch of the stretching groove 23. By setting the first elastic member and the first top block 4, when the driving cylinder drives the upper template 1 to move downward, the stretching block 13 contacts the material strip and squeezes the material strip on the top surface of the first top block 4. During the continuous downward movement of the upper template 1, the first elastic member is compressed and the first top block 4 moves downward. Through the action of the stretching block 13 and the stretching groove 23, the material strip is gradually stretched to form a small barrel, which corresponds to the following example: Figure 7 As shown in the shape of c, after stretching and forming, the driving cylinder drives the upper template 1 to move upward continuously until the first elastic member rebounds and drives the first top block 4 to move upward, so that the first top block 4 pushes the formed small barrel out of the stretching groove 23, ensuring that the material strip can subsequently be smoothly transported along the length direction of the upper template 1 through the feeder.

[0040] like Figure 3 、 Figure 4 and Figure 7 As shown, a second elastic member (not shown) is provided on the bottom surface of the inner wall of the first punching groove 21, and a second top block 211 is fixedly installed on the top of the second elastic member. When the second elastic member is at its original length, the height of the top surface of the second top block 211 is not lower than the height of the notch of the first punching groove 21;

[0041] Here, the top surface height position of the second top block 211 is set to be flush with the height position of the notch of the first punching groove 21. By setting the second elastic member, when the driving cylinder drives the upper template 1 to move downward, the first punching column 11 contacts the material strip and squeezes the material strip on the top surface of the second top block 211. During the continuous downward movement of the upper template 1, the second elastic member is compressed, and the second top block 211 moves downward. Through the action of the first punching column 11, the first punching groove 21 and the first notch 111, the material strip is cut into pieces as shown in the figure. Figure 7 After the upper template 1 is in the shape of a shown in FIG, the driving cylinder drives the upper template 1 to move upward continuously until the second elastic member rebounds and drives the second top block 211 to move upward, thereby ensuring that the material strip can subsequently be smoothly moved along the length direction of the upper template 1 through the feeder.

[0042] like Figure 3 、 Figure 4 and Figure 7 As shown, a third elastic member (not shown) is provided on the bottom surface of the inner wall of the second punching groove 22, and a third top block 221 is fixedly installed on the top of the third elastic member. When the third elastic member is at its original length, the height of the top surface of the third top block 221 is not lower than the height of the notch of the second punching groove 22;

[0043] Here, the top surface height position of the third top block 221 is set to be flush with the height position of the notch of the second punching groove 22. By setting the third elastic member, when the driving cylinder drives the upper template 1 to move downward, the second punching column 12 contacts the material strip and squeezes the material strip on the top surface of the third top block 221. During the continuous downward movement of the upper template 1, the third elastic member is compressed, and the third top block 221 moves downward. Through the action of the second punching column 12, the second punching groove 22 and the second notch 121, the material strip is cut into pieces. Figure 7 After the shape b is shown, the driving cylinder drives the upper template 1 to move upward continuously until the third elastic member rebounds and drives the third top block 221 to move upward, thereby ensuring that the material strip can subsequently be smoothly moved along the length direction of the upper template 1 through the feeder.

[0044] like Figure 3 、 Figure 4 and Figure 5 As shown, the top surfaces of the first top block 4, the second top block 211, and the third top block 221 and the bottom surfaces of the first punching column 11, the second punching column 12, the stretching block 13, and the punching block 14 are all provided with ventilation holes 9 for the purpose of heat dissipation and exhaust.

[0045] like Figure 4 and Figure 5As shown, a plurality of ejector pin grooves are symmetrically provided on both sides of the top surface of the lower template 2 along its length direction, and a spring positioning pin 3 is provided in the ejector pin groove. The spring positioning pin 3 includes a fourth elastic member, a movable column 31 and a limiting column 32. A fourth elastic member (not shown in the figure) is fixedly installed on the bottom surface of the inner wall of the ejector pin groove, and a movable column 31 is fixedly installed on the top of the fourth elastic member. The movable columns 31 symmetrical on both sides are provided with side grooves 311 on the upper side opposite to each other, and the material strip is initially limited in the side grooves 311. A through hole 312 is provided on the bottom surface of the side grooves 311. The bottom surface of the upper template 1 is provided with a through hole 312. A plurality of limiting posts 32 adapted to the through holes 312 are symmetrically provided. The height position of the bottom end of the limiting post 32 is lower than the height position of the bottom surface of the upper template 1. When the fourth elastic member is in its original length, the height position of the bottom surface of the side groove 311 is higher than the height position of the top surface of the lower template 2, the first top block 4, the second top block 211 and the third top block 221. When the fourth elastic member is in a fully compressed state, the height position of the bottom surface of the side groove 311 is not higher than the height position of the top surface of the lower template 2, ensuring that the material strip can fit with the lower template 2, thereby ensuring that the material strip can perform normal punching, stretching and blanking work;

[0046] It should be noted that if Figure 2 As shown, the bottom surface of the upper template 1 is located on the side of the feeding end of the material strip and has two symmetrical positioning punches 16 (the corresponding top surface of the lower template 2 is provided with a positioning punch groove adapted thereto), which is used to punch out positioning holes on the material strip (such as Figure 7 As shown), and facilitate the subsequent limiting column 32 to enter the positioning hole, so that the material strip can be stably transported and moved for punching, stretching and blanking work;

[0047] When the fourth elastic member is in its original length, the top surface of the movable column 31 is higher than the top surface of the lower template 2, the first top block 4, the second top block 211 and the third top block 221. When the driving cylinder drives the upper template 1 to move downward, the upper template 1 will drive the limiting column 32 to move downward until it passes through the positioning hole on the material strip and enters the through hole 312, and the upper template 1 fits and squeezes the movable column 31, thereby squeezing and compressing the fourth elastic member until the bottom surface of the side groove 311 is flush with the top surface of the lower template 2 or The height position is lower than the top surface of the lower template 2, so that the material strip can fit with the lower template 2, thereby ensuring that the material strip can perform normal punching, stretching and blanking work. When the punching, stretching and blanking work of the material strip is completed, the driving cylinder drives the upper template 1 to move upward. At this time, the fourth elastic part rebounds, so that the movable column 31 moves upward, thereby driving the material strip upward, so that the material strip is separated from the lower template 2, further ensuring that the small round barrel formed by stretching can be separated from the stretching groove 23, thereby ensuring that the material strip can subsequently be smoothly transported along the length direction of the upper template 1 through the feeder.

[0048] like Figure 6As shown, the blanking block 14 includes a shaping column 142 and a blanking column 141. The cross-sectional size of the shaping column 142 is smaller than the cross-sectional size of the blanking column 141. The cross-sectional size of the blanking column 141 is adapted to the notch size of the blanking slot 24.

[0049] By setting the shaping column 142, when the upper template 1 moves downward, the blanking column 141 further shapes the small barrel stretched in the previous step before performing the blanking work. Finally, the blanking column 141 cooperates with the outer edge of the blanking groove 24 to cut out the required small barrel.

[0050] like Figure 1 As shown, a bottom plate 6 is provided on the bottom surface of the lower template 2, and a discharge hole which is not smaller than the size of the blanking groove 24 and is directly connected to the blanking groove 24 is opened on the bottom plate 6. A finished product guide plate 7 is also provided at the bottom of the bottom plate 6. The finished product guide plate 7 is located below the discharge hole, so that the punched small barrels are discharged through the finished product guide plate 7 for convenient unified collection (a finished product collection box can be set at the tail end of the finished product guide plate 7).

[0051] like Figure 1 、 Figure 2 and Figure 4 As shown, the upper template 1 is also provided with a first shearing plate 15, which is located on the side of the punching block 14 away from the stretching block 13, and the top surface of the lower template 2 is provided with a second shearing plate 25, and one side of the second shearing plate 25 is provided with a waste guide plate 8. When the upper template 1 moves downward for stretching, the first shearing plate 15 and the second shearing plate 25 move tangentially, so that after punching out a small barrel, the cutting work of the waste strip is completed, and the cut strip is exported through the waste guide plate 8 for convenient unified collection (a waste collection box can be set at the tail end of the waste guide plate 8).

[0052] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-station small stainless steel thin-wall stretching die, comprising an upper die plate (1) and a lower die plate (2), characterized in that: The bottom surface of the upper template (1) is provided with at least one group of punches, each group of punches includes a first punching column (11), a second punching column (12), a stretching block (13) and a shearing block (14) arranged in sequence along the length direction of the upper template (1); the top surface of the lower template (2) is provided with at least one group of punching grooves adapted to the punches; the size of the second punching column (12) is larger than that of the first punching column (11); the outer edge of the first punching column (11) is provided with four first notches (111) equidistantly around the circumference; the outer edge of the second punching column (12) is provided with four second notches (121) equidistantly around the circumference; the angle between the extension line of the line connecting two directly opposite first notches (111) and the extension line of the line connecting two directly opposite second notches (121) is 45° or 135°.

2. The multi-station small stainless steel thin-wall stretching die according to claim 1, characterized in that: There are three groups of punches and grooves, and the three groups of punches are arranged in parallel. The lines between the center points of the three first punching columns (11), the three second punching columns (12), the three stretching blocks (13) and the three punching blocks (14) are all arranged in an isosceles triangle. The two base angles of the isosceles triangle are 30 degrees. The base of the isosceles triangle is perpendicular to the length direction of the upper template (1). The distance between the center points of the first punching column (11) and the second punching column (12) of each group of punches is at least twice the waist length of the isosceles triangle.

3. The multi-station small stainless steel thin-wall stretching die according to claim 2, characterized in that: The diameter of the second punching column (12) is 2 mm larger than the diameter of the first punching column (11), and the line connecting the center points of the first punching column (11) and the second punching column (12) of each group of punches is parallel to the length direction of the upper template (1).

4. The multi-station small stainless steel thin-wall stretching die according to claim 3, characterized in that: The punching groove comprises a first punching groove (21), a second punching groove (22), a stretching groove (23) and a shearing groove (24) which are sequentially opened along the length direction of the lower template (2); a first elastic member is provided on the inner bottom surface of the stretching groove (23); a first top block (4) is fixedly installed on the top end of the first elastic member; when the first elastic member is at its original length, the height position of the top surface of the first top block (4) is not lower than the height position of the notch of the stretching groove (23).

5. The multi-station small stainless steel thin-wall stretching die according to claim 4, characterized in that: A second elastic member is provided on the bottom surface of the inner wall of the first punching groove (21), and a second top block (211) is fixedly mounted on the top of the second elastic member. When the second elastic member is at its original length, the height of the top surface of the second top block (211) is not lower than the height of the notch of the first punching groove (21).

6. The multi-station small stainless steel thin-wall stretching die according to claim 5, characterized in that: A third elastic member is provided on the bottom surface of the inner wall of the second punching groove (22), and a third top block (221) is fixedly mounted on the top of the third elastic member. When the third elastic member is at its original length, the height of the top surface of the third top block (221) is not lower than the height of the notch of the second punching groove (22).

7. The multi-station small stainless steel thin-wall stretching die according to claim 6, characterized in that: The top surfaces of the first top block (4), the second top block (211), and the third top block (221), and the bottom surfaces of the first punching column (11), the second punching column (12), the stretching block (13), and the shearing block (14) are all provided with air holes (9).

8. The multi-station small stainless steel thin-wall stretching die according to claim 6, characterized in that: A plurality of ejector pin grooves are symmetrically provided on both sides of the top surface of the lower template (2) along its length direction. A spring positioning pin (3) is provided in the ejector pin groove. The spring positioning pin (3) comprises a fourth elastic member, a movable column (31) and a limit column (32). The fourth elastic member is fixedly installed on the bottom surface of the inner wall of the ejector pin groove. The movable column (31) is fixedly installed on the top of the fourth elastic member. Side grooves (311) are provided on the upper side of the movable columns (31) symmetrical on both sides. A through hole (312) is provided on the bottom surface of the side grooves (311). The bottom surface of the upper template (1) is provided with a plurality of ejector pin grooves symmetrically along its length direction. A spring positioning pin (3) is provided in the ejector pin groove. The spring positioning pin (3) comprises a fourth elastic member, a movable column (31) and a limit column (32). The fourth elastic member is fixedly installed on the bottom surface of the inner wall of the ejector pin groove. The movable column (31) is fixedly installed on the top of the fourth elastic member. Side grooves (311) are provided on both sides of the bottom surface of the upper template (1). A plurality of limiting columns (32) adapted to the through holes (312) are symmetrically provided along its length direction. The height position of the bottom end of the limiting column (32) is lower than the height position of the bottom surface of the upper template (1). When the fourth elastic member is at its original length, the height position of the bottom surface of the side groove (311) is higher than the height position of the top surfaces of the lower template (2), the first top block (4), the second top block (211) and the third top block (221). When the fourth elastic member is in a fully compressed state, the height position of the bottom surface of the side groove (311) is not higher than the height position of the top surface of the lower template (2).

9. The multi-station small stainless steel thin-wall stretching die according to claim 2, characterized in that: The blanking block (14) comprises a shaping column (142) and a blanking column (141). The cross-sectional size of the shaping column (142) is smaller than the cross-sectional size of the blanking column (141), and the cross-sectional size of the blanking column (141) is adapted to the notch size of the blanking groove (24).

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