Forming die for hollow stainless steel seamed pipe with two end faces in different shapes

Abstract

The utility model discloses a forming die for a hollow stainless steel seamed pipe with two end surfaces in different shapes, which is characterized in that a transverse groove and an inclined groove are sequentially processed on a material belt through a first punching groove hole, a second punching groove hole, a first punching piece and a second punching piece on a set of continuous die; according to the hollow stainless steel seamed pipe with the two end faces different in shape, the isosceles trapezoid plate is obtained, the two bevel edges of the isosceles trapezoid plate are bent through the first stamping part, finally, through cooperation of the second stamping part, the third stamping part, the second lower die block and the third lower die block, the isosceles trapezoid plate is stamped to be in an n shape, and finally the two ends of the n-shaped plate are encircled to obtain the hollow stainless steel seamed pipe with the two end faces different in shape. Therefore, the machining work of the hollow stainless steel seamed pipe with the two end faces different in shape can be completed through one progressive die, the defect that an existing die can only machine the seamed pipe with the two end faces basically similar in shape is overcome, and the trouble that multiple sets of dies are needed for independent machining and positioning in the machining process is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a forming mold for a hollow stainless steel slotted pipe with different shapes at both end faces. Background Technique

[0002] At present, the forming of a slotted pipe (round pipe) with basically similar shapes at both end faces is achieved by making a flat blank into a specific contour (also known as blanking) by punching or laser cutting methods, and then using a stamping or hydraulic device as the power to press it into a tubular shape with a mold.

[0003] After blanking with a single-process mold (or laser cutting), a blanking die, a forming die, and a coiling die are required. The three sets of dies need to be processed separately to form a hollow tubular structure. The shapes of both end faces are basically circular with the same size. Each set of dies needs to be positioned separately, and it is easy to deviate during each positioning. The shapes of both end faces formed are similar and simple. For Figure 10 For the hollow stainless steel slotted pipe with different shapes at both end faces as shown, the existing equipment cannot press it into a hollow stainless steel slotted pipe with different shapes at both end faces at one time like processing a slotted pipe with basically similar shapes at both end faces. Content of the Utility Model

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a forming mold for a hollow stainless steel slotted pipe with different shapes at both end faces, so as to solve the problems that the existing molds can only process slotted pipes with basically similar shapes at both end faces, cannot process a hollow stainless steel slotted pipe with different shapes at both end faces, and the trouble of separate processing and positioning of multiple sets of molds is required during processing.

[0005] To solve the above technical problems, the utility model provides the following technical solution: A forming mold for a hollow stainless steel slotted pipe with different shapes at both end faces, which is used to stamp a long strip of stainless steel strip into a number of hollow stainless steel slotted pipes. The cross-sectional size of the hollow stainless steel slotted pipe gradually increases from one end to the other end. When the hollow stainless steel slotted pipe is unfolded, it is an isosceles trapezoidal plate. The forming mold includes:

[0006] Lower die, on the top surface of the lower die, a first punching slot hole, a second punching slot hole, a first groove, a second groove, a third groove and a discharging slot hole are successively formed along its length direction. At least four of the first punching slot holes are symmetrically and parallelly arranged along the center line of the length direction of the top surface of the lower die. Two of the second punching slot holes are symmetrically arranged obliquely along the width direction of the lower die. A first lower module is arranged in the first groove. One side of the top surface of the first lower module is set as a first bending surface that bends downward. A second lower module in the shape of an 'n' is arranged in the second groove. The height of the top surface of the second lower module gradually decreases from one end to the other end. A third lower module is arranged in the third groove. A U-shaped groove is arranged on the top surface of the third lower module. The depth of the U-shaped groove gradually deepens from one end to the other end. The two ends of the U-shaped groove are set as arcs that expand outward.

[0007] Upper die, on the bottom surface of the upper die, a first punching part, a second punching part, a first stamping part, a second stamping part, a third stamping part and a punching block are successively arranged along its length direction. A second bending surface adapted to the first bending surface is arranged at the bottom of the first stamping part. A profiling groove adapted to the second lower module is formed at the bottom of the second stamping part. A stamping groove adapted to the radian of the top surface of the second lower module is arranged on the bottom surface of the third stamping part. When the third stamping part and the third lower module are closed, a cavity adapted to the outer wall size of the hollow stainless steel slotted pipe is formed.

[0008] Among them, the first punching part and the first punching slot hole are used to punch transverse slots on the long strip-shaped stainless steel strip. There is a connecting interval part between two adjacent transverse slots on the same side of the strip. The second punching part and the second punching slot hole are used to punch inclined slots on the long strip-shaped stainless steel strip to obtain an isosceles trapezoidal plate. Each end of each inclined slot is respectively communicated with a transverse slot. The first lower module and the first stamping part are used to stamp the two hypotenuses of the isosceles trapezoidal plate to form bending edges.

[0009] Preferably, a through hole is formed on the top surface of the lower die. Slide rods are symmetrically and movably arranged on the inner wall of the through hole opposite to both sides of the long side of the lower die. One end of the slide rod enters the through hole and fixedly installs a slider. A discharging slot hole is formed between the two sliders and the other two sides of the inner wall of the through hole. One end of the slide rod penetrates out of the lower die and fixedly installs a stop block. An elastic member is fixedly installed between the stop block and the outer surface of the lower die. The opposite sides of the top surfaces of the two sliders are both set as inclined surfaces or arc surfaces. Two extrusion blocks are symmetrically and fixedly installed on the bottom surface of the upper die. The mutually close sides of the bottom surfaces of the two extrusion blocks are both set as inclined surfaces or arc surfaces. When the elastic member is not deformed, the inclined surface or arc surface of the bottom surface of the extrusion block is located directly above the inclined surface or arc surface of the top surface of the slider. The distance between the bottom surface of the extrusion block and the bottom surface of the upper die is greater than the distance between the bottom surface of the punching block and the bottom surface of the upper die.

[0010] Preferably, a plurality of spring lifter pins are symmetrically arranged along the length direction of the top surface of the lower die, and spring lifter pins are also arranged on the top surface of the slider. Limiting grooves are formed on one side of the outer walls of two symmetrically arranged spring lifter pins facing each other. The distance between two symmetrically arranged limiting grooves is greater than the width of the strip, and the distance between the outer walls of two symmetrically arranged spring lifter pins is less than the width of the strip. When the position of the spring lifter pin is the lowest, the top surface of the inner wall of the limiting groove is flush with the top surface of the lower die.

[0011] Preferably, there are two second lower modules and two third lower modules, both of which are rotationally symmetrically arranged. Two first lower modules that are attached to each other left and right are arranged in each first groove, and the first bending surfaces of the two first lower modules face each other.

[0012] Preferably, at least two first avoidance grooves for accommodating the bending edges are arranged on the top surface of the lower die. The first avoidance grooves are located between the first bending surface and the second groove, and one first avoidance groove communicates with the second groove.

[0013] Preferably, two first shaping grooves are arranged on the top surface of the lower die. The first shaping grooves are located between the second groove and the third groove. First shaping lower modules that are adapted to the size of the second lower module are arranged in the first shaping grooves, and first shaping upper modules that are adapted to the size of the second stamping part are arranged on the bottom surface of the upper die.

[0014] Preferably, at least two second avoidance grooves are arranged on the top surface of the lower die. The first shaping lower module is located between the two second avoidance grooves.

[0015] Preferably, two second shaping grooves are arranged on the top surface of the lower die. The second shaping grooves are located between the third groove and the discharge slot hole. Second shaping lower modules that are adapted to the size of the third lower module are arranged in the second shaping grooves, and second shaping upper modules that are adapted to the size of the third stamping part are arranged on the bottom surface of the upper die.

[0016] Preferably, the included angle between the bending edge and the horizontal plane of the strip is not less than 30°.

[0017] Preferably, a positioning punching hole is formed on the top surface of the lower die at the feeding end of the lower die, and a positioning punching rod is arranged on the bottom surface of the upper die.

[0018] Compared with the prior art, the beneficial effects that the present utility model can achieve are:

[0019] The utility model processes a strip of material through a first punching slot, a second punching slot, a first punching part and a second punching part on a set of progressive dies in sequence to form a transverse slot and an inclined slot, thereby obtaining an isosceles trapezoidal plate. Then, the two hypotenuses of the isosceles trapezoidal plate are bent by a first stamping part. Finally, through the cooperation of a second stamping part, a third stamping part, a second lower die module and a third lower die module, the isosceles trapezoidal plate is first stamped into an N shape, and finally the two ends of the N-shaped plate are surrounded to obtain a hollow stainless steel slotted pipe with different shapes at both ends. Thus, the processing of the hollow stainless steel slotted pipe with different shapes at both ends can be completed by this one progressive die, avoiding the deficiency that the existing die can only process slotted pipes with basically similar shapes at both ends, and avoiding the trouble of separate processing and positioning with multiple sets of dies during processing. Brief Description of the Drawings

[0020] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 is a schematic diagram of the lower die structure of the utility model;

[0022] Figure 3 is a schematic diagram of the spring lifter pin, transverse slot, inclined slot and positioning punching structure of the utility model;

[0023] Figure 4 is a schematic diagram of the first relief groove, second lower die module, second groove, first shaping lower die module, first shaping groove, second relief groove, third lower die module, third groove, second shaping lower die module and second shaping groove of the utility model;

[0024] Figure 5 is a schematic diagram of the upper die structure of the utility model;

[0025] Figure 6 is a schematic diagram of the first stamping part, second bending surface, first lower die module and first bending surface of the utility model;

[0026] Figure 7 is a schematic diagram of the strip forming structure of the utility model;

[0027] Figure 8 is a schematic diagram of the second lower die module, third lower die module, second stamping part and third stamping part of the utility model;

[0028] Figure 9 is a schematic diagram of the extrusion block and slider of the utility model;

[0029] Figure 10 is a schematic diagram of the hollow stainless steel slotted pipe with different shapes at both ends of the structure of the utility model;

[0030] Wherein: 1. Lower die; 11. First punching slot hole; 12. Second punching slot hole; 13. First lower module; 131. First groove; 132. First bending surface; 14. First avoidance groove; 15. Second lower module; 151. Second groove; 16. First shaping lower module; 161. First shaping slot; 17. Second avoidance groove; 18. Third lower module; 181. Third groove; 19. Second shaping lower module; 191. Second shaping slot; 110. Discharge slot hole; 111. Third avoidance groove; 112. Positioning punching hole; 113. Through hole; 2. Upper die; 21. First punching part; 22. Second punching part; 23. First stamping part; 231. Second bending surface; 24. Punching block; 25. Second stamping part; 26. First shaping upper module; 27. Extrusion block; 28. Third stamping part; 29. Second shaping upper module; 210. Positioning punch rod; 3. Lower plate; 4. Upper plate; 5. Spring lifter pin; 61. Slide bar; 62. Slide block; 63. Elastic part; 7. Guide plate; 81. Horizontal groove; 82. Inclined groove; 83. Bending edge; 84. Spacing part; 85. Positioning hole. Detailed implementation manners

[0031] In order to make the technical means, creative features, achieved purposes and functions realized by the present utility model easy to understand, the following combines specific embodiments to further elaborate the present utility model. However, the following embodiments are only the preferred embodiments of the present utility model, not all of them. Based on the embodiments in the implementation manners, other embodiments obtained by those skilled in the art without creative efforts all belong to the protection scope of the present utility model.

[0032] As Figure 1 , Figure 2 , Figure 5 , Figure 7 and Figure 10 shown, the present utility model provides a forming die for a hollow stainless steel slotted pipe with different shapes at both ends, which is used to stamp a long strip-shaped stainless steel strip into a number of hollow stainless steel slotted pipes with different shapes at both ends (as Figure 10 shown, the shapes of the two ends of the hollow stainless steel slotted pipe here are different. Here, taking one end as an ellipse and the other end as an approximate circle as an example for illustration), the cross-sectional size of the hollow stainless steel slotted pipe gradually increases from one end to the other end. When the hollow stainless steel slotted pipe is unfolded, it is an isosceles trapezoidal plate. The forming die includes a lower die 1 and an upper die 2;

[0033] It should be noted that: an upper plate 4 is provided on the top surface of the upper die 2, a lower plate 3 is provided on the bottom surface of the lower die 1, and the upper plate 4 is driven by a driving cylinder to move up and down, so as to realize the clamping of the lower die 1 and the upper die 2 and complete the processing of the long strip-shaped stainless steel strip;

[0034] As Figure 2 , Figure 3 ,Figure 4 , Figure 6 , Figure 7 and Figure 8 as shown in; on the top surface of the lower die 1, a first punching slot hole 11, a second punching slot hole 12, a first groove 131, a second groove 151, a third groove 181 and a discharging slot hole 110 are sequentially formed along its length direction. At least four first punching slot holes 11 are symmetrically and parallelly arranged along the center line of the length direction of the top surface of the lower die 1 (taking four as an example here). Two second punching slot holes 12 are symmetrically arranged obliquely along the width direction of the lower die 1. A first lower module 13 is arranged in the first groove 131. One side of the top surface of the first lower module 13 is set as a first bending surface 132 that bends downward. A second lower module 15 in the shape of an n is arranged in the second groove 151. The height of the top surface of the second lower module 15 gradually decreases from one end to the other end. A third lower module 18 is arranged in the third groove 181. A U-shaped groove is arranged on the top surface of the third lower module 18. The depth of the U-shaped groove gradually deepens from one end to the other end. The two ends of the U-shaped groove are set as arcs that expand outward (as shown in Figure 8 shown here, taking the arc as a 45° inclined guide as an example), which facilitates the smooth entry of the two ends of the bottom of the subsequent n-shaped strip into the U-shaped groove;

[0035] As Figures 5 - 10 shown, on the bottom surface of the upper die 2, a first punching part 21, a second punching part 22, a first stamping part 23, a second stamping part 25, a third stamping part 28 and a punching block 24 are sequentially arranged along its length direction. The first punching part 21 and the second punching part 22 are respectively the profiling of the first punching slot hole 11 and the second punching slot hole 12. A second bending surface 231 adapted to the first bending surface 132 is arranged at the bottom of the first stamping part 23. A profiling groove adapted to the second lower module 15 is formed at the bottom of the second stamping part 25. A stamping groove adapted to the radian of the top surface of the second lower module 15 is arranged on the bottom surface of the third stamping part 28. When the third stamping part 28 and the third lower module 18 are closed, a cavity adapted to the outer wall size of the hollow stainless steel seamless pipe is formed;

[0036] Among them, the first punching part 21 and the first punching slot hole 11 are used to punch transverse slots 81 on the long strip-shaped stainless steel strip. There is a connecting interval part 84 between two adjacent transverse slots 81 on the same side of the strip. The second punching part 22 and the second punching slot hole 12 are used to punch inclined slots 82 on the long strip-shaped stainless steel strip to obtain an isosceles trapezoidal plate. Both ends of each inclined slot 82 are respectively communicated with a transverse slot 81. The first lower module 13 and the first stamping part 23 are used to stamp the two hypotenuses of the isosceles trapezoidal plate to form bending edges 83. The angle between the bending edges 83 and the horizontal plane of the strip is not less than 30°. When it is less than 30°, when the third lower module 18 and the third stamping part 28 are stamping later, the two hypotenuses of the isosceles trapezoidal plate cannot be well surrounded;

[0037] The strip can be traction-fed at equal intervals by an existing traction machine. The strip first passes through four first punching slots 11. The upper die 2 is driven to move downward by a driving air cylinder, thereby driving the first punching part 21 to move downward, and punching four transverse slots 81 on the strip (as shown at point A in Figure 7 ). After the upper die 2 moves upward, the strip continues to be traction-fed, so that both ends of the transverse slot 81 on the strip are respectively located above a second punching slot 12. The upper die 2 is driven to move downward by a driving air cylinder, thereby punching inclined slots 82 on the strip to obtain an isosceles trapezoidal plate (as shown at point B in Figure 7 );

[0038] Then, the strip is traction-fed forward again, so that the two waist hypotenuses of the isosceles trapezoidal plate are located on the first lower module 13. Then, through the stamping of the first stamping part 23, the two hypotenuses of the isosceles trapezoidal plate are inclined downward (as shown at point C in Figure 7 , taking an inclination of 30° as an example here), which is convenient for the subsequent two hypotenuses of the isosceles trapezoidal plate to be well enclosed, so as to finally form;

[0039] Then, the strip is traction-fed forward again, so that the middle of the isosceles trapezoidal plate is directly opposite to the second lower module 15. Through the stamping of the second stamping part 25, it is bent into an n shape (as shown at point D in Figure 7 ). Finally, the strip is traction-fed forward, so that the bottom of the n-shaped plate is directly opposite to the U-shaped groove on the top surface of the third lower module 18. The upper die 2 is driven to move downward by a driving air cylinder, thereby driving the third stamping part 28 to move downward. Due to the action of the bending edge 83, during the stamping process, the two bending edges 83 will approach and enclose each other under the cooperation of the U-shaped groove on the top surface of the third lower module 18 until a hollow stainless steel slotted pipe with different end face shapes is formed (as shown at point E in Figure 7 );

[0040] Finally, the strip is traction-fed forward again, so that the hollow stainless steel slotted pipe formed on the strip is located above the discharge slot hole 110. By driving the punching block 24 to move downward, the blanking work of the hollow stainless steel slotted pipe is completed. At this time, the spacer part 84 of the strip is cut off (as shown at point F in Figure 7 ), realizing the automatic separation of the hollow stainless steel slotted pipe from the strip. Thus, the processing of the hollow stainless steel slotted pipe with different end face shapes can be completed through this one continuous die, avoiding the deficiency that the existing die can only process slotted pipes with basically similar end face shapes, and avoiding the trouble of separate processing and positioning with multiple sets of dies during processing.

[0041] It should be noted that while each subsequent processing step is being carried out, the previous step is also being carried out synchronously;

[0042] The specific forming of the strip into a hollow stainless steel slotted pipe with different end face shapes is as shown in Figure 7 .

[0043] As shown in Figure 1As shown, there is a discharge port on the lower plate 3 opposite to the discharge chute hole 110, and an inclined guide plate 7 is provided at the discharge port. Additionally, a collection box can be placed at the bottom end of the guide plate 7 to complete the automatic collection of the finished hollow stainless steel seamless pipes after stamping and bending.

[0044] As Figure 2 and Figure 9 shown, through holes 113 are formed on the top surface of the lower die 1. Slide bars 61 are symmetrically and movably arranged on both sides of the long side of the lower die 1 opposite to the inner wall of the through holes 113. One end of each slide bar 61 enters the through hole 113 to fixedly install a slider 62. A discharge chute hole 110 is formed between the two sliders 62 and the other two sides of the inner wall of the through hole 113. One end of each slide bar 61 passes through the lower die 1 to fixedly install a stop block, and an elastic member 63 (a spring is set here) is fixedly installed between the stop block and the outer surface of the lower die 1. The opposite sides of the top surfaces of the two sliders 62 are both set as inclined surfaces or arc surfaces. Two extrusion blocks 27 are symmetrically and fixedly installed on the bottom surface of the upper die 2. The mutually approaching sides of the bottom surfaces of the two extrusion blocks 27 are both set as inclined surfaces or arc surfaces. When the elastic member 63 is not deformed, the inclined surface or arc surface on the bottom surface of the extrusion block 27 is located directly above the inclined surface or arc surface on the top surface of the slider 62. The distance between the bottom surface of the extrusion block 27 and the bottom surface of the upper die 2 is greater than the distance between the bottom surface of the punching block 24 and the bottom surface of the upper die 2, so as to ensure accurate positioning of the strip material first and then perform the punching and blanking work; <S

[0045] When the elastic member 63 is in its original length, the distance between the two sliders 62 (i.e., the length of the discharge chute hole 110) is slightly greater than the length of the hollow stainless steel seamless pipe. When driving the upper die 2 to move downward, thereby driving the extrusion block 27 to move downward, since the distance between the bottom surface of the extrusion block 27 and the bottom surface of the upper die 2 is greater than the distance between the bottom surface of the punching block 24 and the bottom surface of the upper die 2, the extrusion block 27 first contacts the slider 62. Since the inclined surface or arc surface on the bottom surface of the extrusion block 27 is located directly above the inclined surface or arc surface on the top surface of the slider 62 (as Figure 9 shown), when the extrusion block 27 moves downward, it will drive the two sliders 62 to move closer to each other (the elastic member 63 is compressed here), so that the length of the discharge chute hole 110 at this time is adapted to the length of the hollow stainless steel seamless pipe. At this time, the spacer portion 84 is located on the slider 62, so that the punched hollow stainless steel seamless pipe will not have the spacer portion 84.

[0046] As Figure 3 and Figure 4As shown, the top surface of the lower mold 1 is symmetrically provided with a plurality of spring floating pins 5 along its length direction, and the top surface of the slider 62 is also provided with a spring floating pin 5. The outer walls of the two symmetrically arranged spring floating pins 5 are provided with a limiting groove on one side, and the distance between the two symmetrical limiting grooves is greater than the width of the material strip, and the distance between the outer walls of the two symmetrical spring floating pins 5 is less than the width of the material strip (to ensure that the spring floating pins 5 will not separate from the limiting groove while limiting the material strip, and the material strip will not be clamped, thereby ensuring the normal stepping movement of the material strip. At this time, the material strip may have a small amount of deviation). When the spring floating pin 5 is at the lowest position, the top surface of the inner wall of the limiting groove is flush with the top surface of the lower mold 1, so that the material strip can be on the top surface of the lower mold 1 for punching the transverse groove 81, the inclined groove 82 and the subsequent bending and forming work;

[0047] When cutting the finished hollow stainless steel seam tube after bending, the upper mold 2 is driven downward by driving the cylinder, thereby driving the extrusion block 27 downward until the extrusion block 27 drives the two sliders 62 to move closer to each other. At this time, the two spring floating pins 5 on the two sliders 62 move closer to each other until the limiting grooves of the two spring floating pins 5 are facing one side and contacting both sides of the material strip, thereby limiting the material strip well and preventing the material strip from deviating left and right, so that the transverse groove 81, the inclined groove 82 and the subsequent stamping and bending edge 83 can be punched on the material strip more stably and accurately, as well as the punching and cutting of the hollow stainless steel seam tube after bending and forming.

[0048] like Figure 2 、 Figure 4 、 Figure 6 and Figure 8 As shown, there are two second lower modules 15 and two third lower modules 18, both of which are rotationally symmetrically arranged. Two first lower modules 13 are arranged in each first groove 131, and the first bending surfaces 132 of the two first lower modules 13 are arranged opposite each other, so that the four oblique sides of two isosceles trapezoidal plates can be bent at one time.

[0049] Since the cut material strip is an isosceles trapezoid, when two second punching holes 12 are provided, a continuous isosceles trapezoid plate (such as Figure 7 As shown), therefore, two second lower modules 15 and two third lower modules 18 are provided here, and both are rotationally symmetrically arranged, thereby enabling one-out-two efficient operation of the hollow stainless steel seamed pipe.

[0050] like Figure 2 、 Figure 4 、 Figure 6 and Figure 7 As shown, the top surface of the lower mold 1 is provided with at least two first avoidance grooves 14 for accommodating the bent edge 83 , the first avoidance groove 14 is located between the first bending surface 132 and the second groove 151 , and one first avoidance groove 14 is connected to the second groove 151 ;

[0051] By setting the first relief groove 14, it is ensured that when the strip moves and the isosceles trapezoidal plate is subsequently stamped and bent, the bent edge 83 will not be pressed and reset. By connecting one first relief groove 14 with the second groove 151, under reasonable circumstances, the length of the lower die 1 is effectively reduced, thereby making the overall equipment more compact.

[0052] As Figure 4 、 Figure 5 and Figure 8 As shown in [figures], two first shaping grooves 161 are provided on the top surface of the lower die 1. The first shaping grooves 161 are located between the second groove 151 and the third groove 181. A first shaping lower module 16 adapted to the size of the second lower module 15 is provided in the first shaping grooves 161. A first shaping upper module 26 adapted to the size of the second stamping part 25 is provided on the bottom surface of the upper die 2.

[0053] By setting the first shaping lower module 16 and the first shaping upper module 26, it is further ensured that the isosceles trapezoidal plate is stably stamped and shaped into an N shape.

[0054] As Figure 4 shown, at least two second relief grooves 17 are provided on the top surface of the lower die 1. The first shaping lower module 16 is located between the two second relief grooves 17.

[0055] By setting the second relief grooves 17 as reserved slots, when the second lower module 15 or the first shaping lower module 16 is damaged after long-term use, it is convenient to add a new second lower module 15 or first shaping lower module 16, avoiding the trouble of replacing the entire lower die 1.

[0056] As Figure 2 、 Figure 4 and Figure 8 As shown in [figures], two second shaping grooves 191 are provided on the top surface of the lower die 1. The second shaping grooves 191 are located between the third groove 181 and the discharge slot hole 110. A second shaping lower module 19 adapted to the size of the third lower module 18 is provided in the second shaping grooves 191. A second shaping upper module 29 adapted to the size of the third stamping part 28 is provided on the bottom surface of the upper die 2.

[0057] By setting the second shaping lower module 19 and the second shaping upper module 29, it is further ensured that the formed N-shaped plate is stably stamped and shaped to obtain a hollow stainless steel slotted pipe with different shapes at both ends as required.

[0058] At the same time, at least two third relief grooves 111 are also provided on the top surface of the lower die 1. The third relief grooves 111 are located between the second shaping grooves 191 and the discharge slot hole 110, which also serve as reserved slots. When the third lower module 18 or the second shaping lower module 19 is damaged after long-term use, it is convenient to add a new third lower module 18 or second shaping lower module 19, avoiding the trouble of replacing the entire lower die 1.

[0059] As Figure 2 , Figure 3 , Figure 5 and Figure 7 shown, a positioning punching hole 112 is formed on the top surface of the lower die 1, located at the feeding end of the lower die 1, and a positioning punch rod 210 is provided on the bottom surface of the upper die 2;

[0060] When the strip is fed, the upper die 2 is driven to move downward by a driving cylinder, so that the positioning punch rod 210 is driven to move downward, thereby punching a positioning hole 85 on the strip first, so as to further limit the strip and ensure more accurate positioning when stamping and bending the strip.

[0061] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hollow stainless steel slotted tube forming die with different shapes at both end faces, characterized in that, It is used to stamp a long strip of stainless steel strip into a number of hollow stainless steel slotted pipes, the cross-sectional size of the hollow stainless steel slotted pipes gradually increases from one end to the other end, and when the hollow stainless steel slotted pipes are unfolded, they are isosceles trapezoidal plates. The forming die includes: A lower die (1), on the top surface of the lower die (1), a first punching slot (11), a second punching slot (12), a first groove (131), a second groove (151), a third groove (181) and a discharging slot (110) are successively arranged along its length direction. At least four of the first punching slots (11) are symmetrically and parallelly arranged along the center line of the length direction of the top surface of the lower die (1). Two of the second punching slots (12) are symmetrically arranged obliquely along the width direction of the lower die (1). A first lower module (13) is arranged in the first groove (131). One side of the top surface of the first lower module (13) is set as a first bending surface (132) that bends downward. A second lower module (15) in the shape of an 'n' is arranged in the second groove (151). The height of the top surface of the second lower module (15) gradually decreases from one end to the other end. A third lower module (18) is arranged in the third groove (181). A U-shaped groove is arranged on the top surface of the third lower module (18). The depth of the U-shaped groove gradually deepens from one end to the other end. The two ends of the U-shaped groove are set as arcs that expand outwards; An upper die (2), on the bottom surface of the upper die (2), a first punching member (21), a second punching member (22), a first stamping member (23), a second stamping member (25), a third stamping member (28) and a punching block (24) are successively arranged along its length direction. A second bending surface (231) adapted to the first bending surface (132) is arranged at the bottom of the first stamping member (23). A profiling groove adapted to the second lower module (15) is arranged at the bottom of the second stamping member (25). A stamping groove adapted to the radian of the top surface of the second lower module (15) is arranged on the bottom surface of the third stamping member (28). When the third stamping member (28) and the third lower module (18) are closed, a cavity adapted to the outer wall size of the hollow stainless steel slotted pipe is formed; Among them, the first punching member (21) and the first punching slot (11) are used to punch a transverse slot (81) on the long strip of stainless steel strip. There is a connecting interval part (84) between two adjacent transverse slots (81) on the same side of the strip. The second punching member (22) and the second punching slot (12) are used to punch an inclined slot (82) on the long strip of stainless steel strip to obtain an isosceles trapezoidal plate. Each end of each inclined slot (82) is respectively communicated with a transverse slot (81). The first lower module (13) and the first stamping member (23) are used to stamp the two hypotenuses of the isosceles trapezoidal plate to form bending edges (83).

2. The hollow stainless steel slotted tube forming die with different shapes at both ends according to claim 1, characterized in that: A through hole (113) is formed in the top surface of the lower die (1). On both sides of the long side of the lower die (1) facing the inner wall of the through hole (113), slide bars (61) are symmetrically and movably arranged. One end of each slide bar (61) enters the through hole (113) and fixedly installs a slider (62). A discharge slot hole (110) is formed between the two sliders (62) and the other two sides of the inner wall of the through hole (113). One end of the slide bar (61) penetrates through the lower die (1) and fixedly installs a stop block. An elastic member (63) is fixedly installed between the stop block and the outer surface of the lower die (1). The top surfaces of the two sliders (62) on the opposite sides are both set as inclined surfaces or arc surfaces. On the bottom surface of the upper die (2), two extrusion blocks (27) are symmetrically and fixedly installed. The bottom surfaces of the two extrusion blocks (27) on the side close to each other are both set as inclined surfaces or arc surfaces. When the elastic member (63) is not deformed, the inclined surface or arc surface on the bottom surface of the extrusion block (27) is directly above the inclined surface or arc surface on the top surface of the slider (62). The distance between the bottom surface of the extrusion block (27) and the bottom surface of the upper die (2) is greater than the distance between the bottom surface of the punching block (24) and the bottom surface of the upper die (2).

3. The hollow stainless steel slotted tube forming die with different shapes at both ends according to claim 2, characterized in that: Along the length direction of the top surface of the lower die (1), a plurality of spring lifter pins (5) are symmetrically arranged. Spring lifter pins (5) are also arranged on the top surface of the slider (62). On the outer walls of two symmetrically arranged spring lifter pins (5) facing each other, limit slots are formed. The distance between the two symmetric limit slots is greater than the width of the strip. The distance between the outer walls of the two symmetric spring lifter pins (5) is less than the width of the strip. When the spring lifter pins (5) are at the lowest position, the top surface of the inner wall of the limit slot is flush with the top surface of the lower die (1).

4. The hollow stainless steel slotted tube forming die with different end face shapes according to claim 3, characterized in that: There are two of each of the second lower modules (15) and the third lower modules (18), and they are both rotationally symmetrically arranged. In each first groove (131), two first lower modules (13) that are attached to each other left and right are arranged. The first bending surfaces (132) of the two first lower modules (13) face each other.

5. The hollow stainless steel welded pipe forming die with different end face shapes according to claim 4, characterized in that: On the top surface of the lower die (1), at least two first avoidance grooves (14) for accommodating the bending edges (83) are provided. The first avoidance grooves (14) are located between the first bending surfaces (132) and the second grooves (151). One of the first avoidance grooves (14) communicates with the second groove (151).

6. The hollow stainless steel slotted tube forming die with different shapes at both end faces according to claim 5, characterized in that: On the top surface of the lower die (1), two first shaping grooves (161) are provided. The first shaping grooves (161) are located between the second grooves (151) and the third grooves (181). In the first shaping grooves (161), first shaping lower modules (16) that are adapted to the size of the second lower modules (15) are arranged. On the bottom surface of the upper die (2), first shaping upper modules (26) that are adapted to the size of the second stamping parts (25) are provided.

7. The hollow stainless steel welded pipe forming die with different shapes at both ends according to claim 6, characterized in that: On the top surface of the lower die (1), at least two second avoidance grooves (17) are provided. The first shaping lower modules (16) are located between the two second avoidance grooves (17).

8. The hollow stainless steel welded pipe forming die with different shapes at both end faces according to claim 7, characterized in that: The top surface of the lower die (1) is provided with two second shaping grooves (191), the second shaping grooves (191) are located between the third grooves (181) and the discharge chute holes (110), a second shaping lower module (19) adapted to the size of the third lower module (18) is arranged in the second shaping grooves (191), and the bottom surface of the upper die (2) is provided with a second shaping upper module (29) adapted to the size of the third stamping part (28).

9. The hollow stainless steel slotted tube forming die with different shapes at both end faces according to claim 1, characterized in that: The included angle between the bent edge (83) and the horizontal plane of the strip is not less than 30°.

10. The hollow stainless steel welded pipe forming die with different shapes at both end faces according to claim 8, characterized in that: The top surface of the lower die (1) is provided with positioning punching holes (112) at the feeding end of the lower die (1), and the bottom surface of the upper die (2) is provided with positioning punch rods (210).

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