CN220636036U - Elastic sheet forming progressive die - Google Patents

Abstract

The utility model discloses a spring piece forming progressive die which is used for bending a spring piece and comprises a conveying strip, a die clamping driving piece, an upper die assembly and a lower die assembly; the conveying strip linearly conveys the elastic sheet from left to right so that the elastic sheet sequentially passes through a right-angle bending station, a negative-angle bending station and a forming angle station between the upper die assembly and the lower die assembly; when the upper die assembly and the lower die assembly are driven by the die assembly driving piece to fold, the right-angle bending station forms a right-angle forming cavity, so that the elastic sheet forms a right angle in the right-angle forming cavity, and the angle of the right-angle forming cavity is consistent with that of the right-angle forming cavity; the bent negative angle station forms an acute angle forming cavity so that the elastic sheet forms an acute angle in the acute angle forming cavity, wherein the angle of the acute angle is consistent with that of the acute angle forming cavity; the forming angle station is provided with a groove for placing one side of the bullet feeding sheet; when the upper die assembly and the lower die assembly are folded, the upper die assembly presses down the other side of the elastic sheet to reduce the opening angle of the two sides of the elastic sheet. According to the utility model, the elastic sheet is bent for multiple times, so that the excessive deformation of one-time molding is avoided, and the molded size of the product is ensured.

Description

Elastic sheet forming progressive die

Technical Field

The utility model relates to the technical field of elastic sheet forming, in particular to an elastic sheet forming progressive die.

Background

Small angle types of spring are often found in hardware stampings. Such as the contact pieces of the positive and negative plates of the battery, and the like, and the elastic spring piece is adopted under the condition that the spring is not easy to install in a narrow space. In the production process of the elastic sheet with a similar structure, if a common bending mode is adopted for a bending piece with a small angle, namely a male die protruding out of the lower bottom surface of the upper die assembly is arranged on the upper die assembly, a female die is arranged on the lower die assembly and is opposite to the male die, the elastic sheet is placed on the female die, the elastic sheet is in a straight shape before bending, when the upper die assembly and the lower die assembly are assembled, the male die downwards presses the elastic sheet to form the small-angle elastic sheet by one-time punching, but in the process that the male die downwards moves to downwards punch the elastic sheet to bend the straight elastic sheet into a small angle, the deformation of the elastic sheet is overlarge, and the unstable forming size of a product is easily caused.

Disclosure of Invention

The utility model aims to provide a spring sheet forming progressive die which overcomes the defect of unstable product size caused by overlarge deformation of a spring sheet in one-time stamping.

To achieve the above object, the solution of the present utility model is: the utility model provides a shell fragment shaping progressive die for buckle shell fragment, its characterized in that: comprises a conveying belt, a mold clamping driving piece, an upper mold assembly and a lower mold assembly;

the conveying strip linearly conveys the elastic sheet from left to right so that the elastic sheet sequentially passes through a right-angle bending station, a negative-angle bending station and a forming angle station between the upper die assembly and the lower die assembly;

the mold closing driving piece drives the upper mold assembly and the lower mold assembly to open and close up and down;

when the upper die assembly and the lower die assembly are driven by the die assembly driving piece to fold, the right-angle bending station forms a right-angle forming cavity, so that the elastic sheet forms a right angle in the right-angle forming cavity, and the angle of the right-angle forming cavity is consistent with that of the right-angle forming cavity; the bent negative angle station forms an acute angle forming cavity so that the elastic sheet forms an acute angle in the acute angle forming cavity, wherein the angle of the acute angle is consistent with that of the acute angle forming cavity;

the forming angle station is provided with a groove for placing one side of the sharp-angle elastic sheet; when the upper die assembly and the lower die assembly are folded, the upper die assembly presses down the elastic sheet so that the other side of the elastic sheet reduces the opening angle of the two sides of the elastic sheet.

Further, the shell fragment includes fixed part and shaping portion, in the right angle station department of bending, the top surface of lower mould subassembly is provided with the right angle die that bends, the bottom surface of going up the mould subassembly is provided with the right angle terrace die that bends, the fixed part of shell fragment falls on the right angle die that bends, shaping portion stretches out the right angle die that bends, the right angle terrace die that bends is located shaping portion directly over, in order to make the right angle between right angle terrace die that bends and the right angle die that bends form the die cavity when last mould subassembly and lower mould subassembly are closed, drive the shaping portion of bending right angle terrace die pushing down the shell fragment, make the shell fragment form the right angle unanimous with right angle formation die cavity angle.

Further, an acute angle male die is arranged on the top surface of the lower die assembly, a fixing part of the elastic piece falls on the acute angle male die, a guide groove obliquely extending to the lower side is formed in the lower die assembly, a sliding block is arranged on the guide groove, the sliding block slides along the extending direction of the guide groove, a first elastic ejector rod is arranged at the bottom of the sliding block, the first elastic ejector rod elastically stretches up and down and drives the sliding block to slide left along the guide groove so as to protrude out of the top side of the lower die assembly, and when the upper die assembly and the lower die assembly are folded, the upper die assembly pushes down the sliding block to bend the forming part of the elastic piece along the guide groove to form an acute angle forming cavity between the sliding block and the acute angle male die, so that the elastic piece forms an acute angle consistent with the acute angle forming cavity angle.

Further, at the forming angle station, a forming female die is arranged on the top surface of the lower die assembly, a forming male die is arranged on the bottom surface of the upper die assembly, a groove is formed in the top side of the forming female die and is opened upwards, the forming part of the elastic sheet is located in the groove, the forming male die is opposite to the forming part of the elastic sheet, and when the upper die assembly and the lower die assembly are folded, the forming male die presses down the forming part of the elastic sheet to reduce an included angle between the fixing part and the forming part of the elastic sheet.

Further, the bottom of the acute angle male die is provided with a second elastic ejector rod, the second elastic ejector rod stretches elastically up and down, and when the upper die assembly and the lower die assembly are in an open state, the acute angle male die is driven to move upwards, and the top surface of the acute angle male die and the top surface of the sliding block are on the same horizontal plane.

Further, a first inclined surface which extends obliquely to the lower right side is arranged on the sliding block, a second inclined surface which is consistent with the inclination angle of the first inclined surface is arranged on the acute angle male die, the first inclined surface and the second inclined surface are oppositely arranged, and when the upper die assembly and the lower die assembly are folded, the sliding block slides right and forms the acute angle forming cavity with the acute angle male die.

After the scheme is adopted, the beneficial effects of the utility model are as follows:

through setting up three stations of curved right angle station, curved negative angle station and shaping angle station, the conveyer belt passes through these three stations in proper order with the shell fragment, forms the right angle at right angle shaping chamber, forms the acute angle at first acute angle shaping chamber, forms final shaping angle at second acute angle shaping chamber, can guarantee the fashioned size of product, makes the shaping angle of shaping shell fragment more stable, is difficult for the resilience.

Drawings

Fig. 1 is a schematic view of the structure of the bending station of the present utility model in the opened state of the upper and lower die assemblies.

FIG. 2 is a schematic view of the construction of the bending station of the present utility model in the closed position of the upper and lower die assemblies.

FIG. 3 is a schematic view of a negative angle station in an open configuration of the upper and lower die assemblies of the present utility model.

FIG. 4 is a schematic diagram of a second bend negative angle station in the open position of the upper and lower die assemblies of the present utility model.

FIG. 5 is a schematic view of the structure of the bending station in the closed position of the upper and lower die assemblies of the present utility model.

FIG. 6 is a schematic view of the forming angle station structure of the upper and lower die assemblies of the present utility model in their closed configuration.

Fig. 7 is a schematic diagram of a forming structure of the spring plate of the present utility model.

Fig. 8 is an assembly schematic diagram of the elastic sheet forming progressive die of the utility model.

Description of the reference numerals:

the device comprises a 1-elastic sheet, a 2-conveying belt, a 3-mold closing driving piece, a 4-upper mold assembly, a 5-lower mold assembly, a 6-right angle forming station, a 7-negative angle forming station, an 8-forming angle station, a 9-sliding block, a 41-right angle forming male mold, a 42-forming male mold, a 43-upper mold plate, a 44-limiting plate, a 45-unloading plate, a 46-first pressing block, a 47-second pressing block, a 51-right angle forming female mold, a 52-acute angle male mold, a 53-guiding groove, a 54-first elastic ejector rod, a 55-forming female mold, a 56-second elastic ejector rod, a 57-lower mold plate, a 58-lower cushion plate, a 59-female mold plate, a 61-right angle forming cavity, a 71-acute angle forming cavity, a 81-groove, a 91-first inclined surface, a 511-first yielding area, a 521-second inclined surface, a 522-second yielding area and a 551-third yielding area.

Detailed Description

The utility model will be described in detail with reference to the accompanying drawings and specific embodiments.

In the claims, specification and drawings hereof, unless explicitly defined otherwise, references to orientation terms such as "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise", etc., are used merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, nor should they be construed as limiting the scope of the utility model in particular.

As shown in fig. 1 to 8, the present utility model provides a continuous die for forming elastic sheets, which comprises a conveying belt 2, a die clamping driving member 3, an upper die assembly 4 and a lower die assembly 5; the number of the mold closing driving parts 3 is two, and the mold closing driving parts are respectively arranged at the left side and the right side of the upper mold assembly 4 and the lower mold assembly 5 so as to ensure that the upper mold assembly 4 runs downwards towards the lower mold assembly 5 more balanced and stable. The bending device is used for bending the elastic sheet 1, specifically, an angle theta 2 (shown in fig. 7) formed after the elastic sheet 1 is bent, and in order to ensure stable forming of the forming angle theta 2 of the elastic sheet 1, the elastic sheet 1 is sequentially bent by arranging three elastic sheet bending stations, wherein the three elastic sheet bending stations respectively comprise a bending right angle station 6, a bending negative angle station 7 and a forming angle station 8.

As shown in fig. 8, the conveying belt 2 conveys the elastic sheet 1 straight from left to right so that the elastic sheet 1 passes through the corner angle station 6, the corner angle station 7 and the corner angle forming station 8 between the upper die assembly 4 and the lower die assembly 5 in this order; the mold closing driving piece 3 drives the upper mold assembly 4 and the lower mold assembly 5 to open and close up and down; when the upper die assembly 4 and the lower die assembly 5 are closed by the die closing driving piece 3, the right-angle bending station 6 forms a right-angle forming cavity 61, so that the elastic sheet 1 forms a right-angle shape (shown in fig. 2) in the right-angle forming cavity 61, wherein the angle of the right-angle shape is consistent with that of the right-angle forming cavity 61; the bending negative angle station 7 forms an acute angle forming cavity 71 so that the elastic sheet 1 forms an acute angle shape (shown in fig. 5) in the acute angle forming cavity 71, wherein the angle of the acute angle shape is consistent with that of the acute angle forming cavity 71; the forming angle station 8 is provided with a groove 81 for placing one side of the sharp-angle elastic sheet 1; when the upper die assembly 4 and the lower die assembly 5 are closed, the upper die assembly 4 presses down the elastic sheet 1 so that the other side of the elastic sheet 1 reduces the opening angle of the two sides of the elastic sheet 1 (as shown in fig. 6). The elastic sheet 1 sequentially passes through the bending right angle station 6, the bending negative angle station 7 and the forming angle station 8 to be subjected to bending forming, so that the product forming size can be ensured, the forming angle of the formed elastic sheet is more stable, and the elastic sheet is not easy to rebound.

In this embodiment, as shown in fig. 3, the upper die assembly 4 includes an upper die plate 43, a limiting plate 44 and a stripper plate 45 sequentially disposed from top to bottom, and the lower die assembly 5 includes a lower die plate 57, a lower backing plate 58 and a die plate 59 sequentially disposed from bottom to top.

In this embodiment, as shown in fig. 7, the elastic sheet 1 includes a fixing portion 11 and a forming portion 12, and specifically, the elastic sheet 1 is bent and formed at three stations of the bending right angle station 6, the bending negative angle station 7 and the forming angle station 8, the fixing portion 11 is used for pressing and fixing, the bending right angle station 6, the bending negative angle station 7 and the forming angle station 8 respectively perform bending and forming on the forming portion 12, so that the elastic sheet 1 is prevented from sliding in the bending and forming process, so as to ensure the size after the elastic sheet 1 is formed, the precision is good, and the yield is high.

In this embodiment, as shown in fig. 1, at the right-angle bending station 6, the top surface of the lower die assembly 5 is provided with a right-angle bending die 51, the bottom surface of the upper die assembly 4 is provided with a right-angle bending punch 41, the fixing portion 11 of the elastic sheet 1 falls on the right-angle bending die 51, the forming portion 12 extends out of the right-angle bending die 51, and the right-angle bending punch 41 is located right above the forming portion 12, so that when the upper die assembly 4 and the lower die assembly 5 are folded, a right-angle forming cavity 61 is formed between the right-angle bending punch 41 and the right-angle bending die 51, and the right-angle bending punch 41 is driven to press the forming portion 12 of the elastic sheet 1, so that the elastic sheet 1 forms a right-angle shape consistent with the right-angle forming cavity 61 (as shown in fig. 2). Specifically, the right-angle bending male die 41 is in a square structure and is vertically placed, the right-angle bending female die 51 is in a square structure and is vertically placed, the distance between the right-angle bending male die 41 and the right-angle bending female die 51 along the width direction is the thickness of the elastic sheet 1, in addition, the stripper plate 45 is also provided with a first pressing block 46, the first pressing block 46 is inlaid on the stripper plate 45 and exposes the lower bottom surface of the stripper plate 45, the first pressing block 46 is located right above the elastic sheet 1 fixing part 11, and when the upper die assembly 4 and the lower die assembly 5 are folded, a right-angle molding cavity 61 is formed among the first pressing block 46, the right-angle bending male die 41 and the right-angle bending female die 51.

Specifically, the right-angle bending male die 41 protrudes from the bottom surface of the upper die assembly 4, specifically is arranged on the limiting plate 44, penetrates downwards and protrudes from the lower end of the stripper plate 45, when the die assembly driving piece 3 drives the upper die assembly 4 and the lower die assembly 5 to fold, the right-angle bending male die 41 moves downwards and bends the forming part 12 of the elastic sheet 1, so that the elastic sheet 1 is prevented from being bent when the upper die assembly 4 and the lower die assembly 5 are folded, and the impact force is too large, so that the elastic sheet 1 is easy to bend, and defective products are caused.

In this embodiment, as shown in fig. 4, at the bending negative angle station 7, the top surface of the lower die assembly 5 is provided with an acute angle male die 52, the fixed portion 11 of the elastic sheet 1 falls on the acute angle male die 52, the lower die assembly 5 is provided with a guide groove 53 extending obliquely downward to the right side, the guide groove 53 is provided with a sliding block 9, the sliding block 9 slides along the extending direction of the guide groove 53, the bottom of the sliding block 9 is provided with a first elastic ejector rod 54, the first elastic ejector rod 54 stretches elastically up and down, and drives the sliding block 9 to slide left along the guide groove 53 and protrude out of the top side of the lower die assembly 5, when the upper die assembly 4 and the lower die assembly 5 are folded, the upper die assembly 4 pushes the sliding block 9 to slide right along the guide groove 53, an acute angle forming cavity 71 is formed between the sliding block 9 and the acute angle male die 52, the sliding block 9 slides the forming portion 12 of the elastic sheet 1 to bend the elastic sheet 1 to form an acute angle consistent with the acute angle forming cavity 71, and the included angle between the fixed portion 11 and the forming portion 12 of the elastic sheet 1 is θ1 (as shown in fig. 5).

In this embodiment, as shown in fig. 4, a first inclined plane 91 extending obliquely to the lower right is provided on the slide block 9, a second inclined plane 521 having an inclination angle identical to that of the first inclined plane 91 is provided on the acute angle male die 52, the first inclined plane 91 and the second inclined plane 521 are disposed opposite to each other, when the upper die assembly 4 and the lower die assembly 5 are closed, the slide block 9 slides right and forms the acute angle forming cavity 71 with the acute angle male die 52, concretely, the top surface of the acute angle male die 52 is disposed horizontally, the included angle between the second inclined plane 521 and the top surface is the acute angle θ1, the slide block 9 slides right, the first inclined plane 91 abuts against the forming part 12, the forming part 12 is bent to have an inclination identical to that of the first inclined plane 91, and the fixing part 11 is horizontal, so that the included angle between the forming part 12 and the fixing part 11 is the acute angle θ1, thereby ensuring that the angle formed by the spring plate 1 at the bending angle station 7 is θ1.

Specifically, as shown in fig. 4, a second elastic ejector rod 56 is arranged at the bottom of the acute angle male die 52, the second elastic ejector rod 56 elastically stretches up and down and drives the acute angle male die 52 to move up, and when the upper die assembly 4 and the lower die assembly 5 are in an open state, the top surface of the acute angle male die 52 and the top surface of the sliding block 9 are on the same horizontal plane. When the mold closing driving member 3 drives the upper mold assembly 4 and the lower mold assembly 5 to close, the upper mold assembly 4 moves downward, and the lower bottom surface of the lower mold assembly 4 simultaneously abuts against and presses down the top surface of the slide block 9 and the fixing portion of the elastic sheet 1 placed on the top surface of the acute angle male mold 52, so that the forming portion 12 of the elastic sheet 1 can be bent simultaneously until the forming portion 12 is bent to be consistent with the inclination of the first inclined surface 91 in the process that the slide block 9 moves downward to the right side along the guide groove 53. The upper die assembly 4 is prevented from being pushed down and driving the sliding block 9 to slide rightwards in the downward moving process, the forming part 12 is bent until the upper die assembly 4 and the lower die assembly 5 are completely folded, the bending distance is short, the time is short, the elastic sheet 1 is easy to bend due to overlarge impact force, and defective products are easy to occur. Of course, in other embodiments, the acute angle male die 52 is fixedly designed on the female die plate 57 of the lower die assembly 5, and the upper die assembly 4 presses the slide block 9 to slide right, so that the forming portion 12 can be bent and formed, and those skilled in the art can design according to specific situations, but the utility model is not limited thereto.

Specifically, as shown in fig. 5, a second pressing block 47 is further disposed on the stripper plate 45, the second pressing block 47 is inlaid on the stripper plate 45 and exposes the lower bottom surface of the stripper plate 45, the second pressing block 47 is located right above the fixing portion 11 of the elastic sheet 1, when the upper die assembly 4 and the lower die assembly 5 are closed, the second pressing block 47 and the acute angle male die 52 clamp the fixing portion 11 of the elastic sheet 1, the sliding block 9 and the acute angle male die 52 clamp the forming portion 12 of the elastic sheet 1, and an acute angle forming cavity 71 is formed among the second pressing block 47, the sliding block 9 and the acute angle male die 52.

In this embodiment, as shown in fig. 6, at the forming angle station 8, the top surface of the lower die assembly 5 is provided with a forming die 55, the bottom surface of the upper die assembly 4 is provided with a forming punch 42, a groove 81 is formed on the top side of the forming die 55 and is opened upwards, the forming portion 12 of the sharp-angled elastic sheet 1 falls into the groove 81, the forming punch 42 faces the forming portion 12 of the elastic sheet 1, and when the upper die assembly 4 and the lower die assembly 5 are folded, the forming punch 42 presses down the forming portion 12 of the elastic sheet 1 to reduce the included angle between the fixing portion 11 and the forming portion 12 of the elastic sheet 1, so as to form θ2. Specifically, the cross-sectional shape of the groove 81 has an angle formed by the elastic sheet 1, the bottom surface of the cross-section is inclined, the included angle between the bottom surface and the horizontal surface is smaller than the acute angle θ2, the forming part 12 of the sharp elastic sheet 1 falls on the inclined surface, and when the upper die assembly 4 is pressed down, the forming part 12 is bent into a forming surface consistent with the inclined surface, so that the included angle between the forming part 12 and the fixing part 11 is θ2.

In this embodiment, before the elastic sheet 1 passes through the right-angle bending station 6, the two ends of the elastic sheet 1 are respectively processed at a small right angle and a small bevel angle, so that the end of the elastic sheet 1 located at the fixing portion 11 forms a small right angle for bending upwards, and the end of the elastic sheet 1 located at the forming portion forms a small bevel angle for bending downwards. Correspondingly, the molds on the right-angle bending station 6, the negative-angle bending station 7 and the forming angle forming station 8 are adaptively designed, namely, a first yielding area 511 for avoiding the small bevel angle of the elastic sheet 1 is arranged on the left side of the right-angle bending female die 51 of the right-angle bending station 6, a second yielding area 522 for avoiding the small bevel angle of the elastic sheet 1 is arranged on the left side of the acute-angle male die 52 of the negative-angle bending station 7, and a third yielding area 551 for avoiding the small bevel angle of the elastic sheet 1 is arranged on the top side of the forming female die 55 of the forming angle forming station 8.

The working process comprises the following steps:

when the upper die assembly 4 and the lower die assembly 5 are in an open state, the conveying strip 2 conveys the elastic pieces 1 in a straight line from left to right, the number of the elastic pieces 1 is N, when the first elastic piece 1 passes through the right-angle station 6, the conveying strip 2 stops conveying, the upper die assembly 4 moves downwards, the first material pressing block 46 fixes the fixing part 11 of the elastic piece 1, the right-angle bending male die 41 bends the forming part 12 of the elastic piece 1 until the upper die assembly 4 and the lower die assembly 5 are completely folded, and the elastic piece 1 forms the right-angle elastic piece 1; the upper die assembly 4 moves upwards until the upper die assembly 4 and the lower die assembly 5 are in an open state, the conveying strip 2 conveys the elastic pieces 1 from left to right again, the first elastic piece 1 is positioned at a bending negative angle station 7, the fixed part 11 of the first elastic piece 1 falls on an acute angle male die 52, the second elastic piece 1 is positioned at a bending right angle station, the upper die assembly 4 moves downwards until the second pressing block 47 fixes the fixed part 11 of the right angle elastic piece 1, the upper die assembly 4 drives the sliding block 9 to slide rightwards, the sliding block 9 bends the forming part 12 of the elastic piece 1, and when the upper die assembly 4 and the lower die assembly 5 are completely folded, the angle formed by the elastic pieces 1 is theta 1, and at the moment, the second elastic piece 1 positioned at the bending right angle station 6 is bent into the right angle elastic piece 1; when the upper die assembly 4 moves upwards again until the upper die assembly 4 and the lower die assembly 5 are in an open state, the conveying strip 2 conveys the elastic pieces 1 from left to right linearly again, so that the first elastic piece 1 is positioned in the forming angle station 8, the forming part 12 of the first elastic piece 1 falls in the groove 81, the second elastic piece 1 is positioned in the bending negative angle station 7, the third elastic piece is positioned in the bending angle station 6, the upper die assembly 4 moves downwards, the forming male die 42 moves downwards to press the forming part 12 of the first elastic piece 1 downwards, the angle formed by the first elastic piece 1 is theta 2, at the moment, the second elastic piece 1 positioned in the bending negative angle station 7 is bent into the elastic piece 1 with the angle theta 1, and the third elastic piece 1 positioned in the bending right angle station 6 is bent into the elastic piece 1 with the angle theta 1; the first elastic sheet 1 completes the theta 2 angle forming, the second elastic sheet 2, the third elastic sheet 1 … … and the Nth elastic sheet 1 pass through each station sequentially through the conveying strip 2 to finally complete the theta 2 angle forming.

The above embodiments are only preferred embodiments of the present utility model, and are not limited to the present utility model, and all equivalent changes made according to the design key of the present utility model fall within the protection scope of the present utility model.

Claims (6)

1. The utility model provides a shell fragment shaping progressive die for buckle shell fragment (1), its characterized in that: comprises a conveying belt (2), a die clamping driving piece (3), an upper die assembly (4) and a lower die assembly (5);

the conveying strip (2) is used for linearly conveying the elastic sheet (1) from left to right so that the elastic sheet (1) sequentially passes through a right-angle bending station (6), a negative-angle bending station (7) and a forming angle station (8) between the upper die assembly (4) and the lower die assembly (5);

the mold closing driving piece (3) drives the upper mold assembly (4) and the lower mold assembly (5) to open and close up and down;

when the die assembly driving piece (3) drives the upper die assembly (4) and the lower die assembly (5) to be folded, the right-angle bending station (6) forms a right-angle forming cavity (61) so that the elastic sheet (1) forms a right angle in the right-angle forming cavity (61) and is consistent with the right-angle forming cavity (61); the bending negative angle station (7) forms an acute angle forming cavity (71) so that the elastic sheet (1) forms an acute angle in the acute angle forming cavity (71) which is consistent with the angle of the acute angle forming cavity (71);

the forming angle station (8) is provided with a groove (81) for placing one side of the sharp-angle elastic sheet (1); when the upper die assembly (4) and the lower die assembly (5) are folded, the upper die assembly (4) presses down the other side of the elastic sheet (1) to reduce the opening angle of the two sides of the elastic sheet (1).

2. The progressive die for forming elastic sheets according to claim 1, characterized in that: the elastic piece (1) comprises a fixing part (11) and a forming part (12), a right-angle bending die (51) is arranged on the top surface of the lower die assembly (5) at a right-angle bending station (6), a right-angle bending die (41) is arranged on the bottom surface of the upper die assembly (4), the fixing part (11) of the elastic piece (1) falls on the right-angle bending die (51), the forming part (12) extends out of the right-angle bending die (51), the right-angle bending die (41) is located right above the forming part (12) so that a right-angle forming cavity (61) is formed between the right-angle bending die (41) and the right-angle bending die (51) when the upper die assembly (4) and the lower die assembly (5) are folded, and the forming part (12) of the elastic piece (1) is driven to be pressed down, so that the elastic piece (1) forms a right angle consistent with the right-angle forming cavity (61).

3. A progressive die for forming shrapnel according to claim 2, wherein: the upper die assembly is characterized in that an acute angle male die (52) is arranged on the top surface of the lower die assembly (5), a fixing portion (11) of the elastic sheet (1) falls on the acute angle male die (52), a guide groove (53) which extends obliquely towards the lower side is formed in the lower die assembly (5), a sliding block (9) is arranged on the guide groove (53), the sliding block (9) slides along the extending direction of the guide groove (53), a first elastic ejector rod (54) is arranged at the bottom of the sliding block (9), the first elastic ejector rod (54) stretches elastically up and down, the sliding block (9) is driven to slide left along the guide groove (53) and protrude out of the top side of the lower die assembly (5), and when the upper die assembly (4) and the lower die assembly (5) are folded, the upper die assembly (4) downwards presses the sliding block (9) to bend a forming portion (12) of the elastic sheet (1) along the guide groove (53), so that an acute angle forming cavity (71) is formed between the sliding block (9) and the acute angle male die (52), and the elastic sheet (1) forms an acute angle forming cavity (71) in a consistent angle.

4. A progressive die for forming shrapnel according to claim 2, wherein: the forming angle station (8) department, the top surface of lower mould subassembly (5) is provided with shaping die (55), the bottom surface of last mould subassembly (4) is provided with shaping terrace die (42), recess (81) set up in the top side of shaping die (55) and upwards open setting, shaping portion (12) of shell fragment (1) fall in recess (81), shaping terrace die (42) just right shaping portion (12) of shell fragment (1), when last mould subassembly (4) are closed with lower mould subassembly, shaping terrace die (42) pushes down shaping portion (12) of shell fragment (1) in order to reduce the contained angle between fixed part (11) and shaping portion (12) of shell fragment (1).

5. A progressive die for forming shrapnel according to claim 3, wherein: the bottom of the acute angle male die (52) is provided with a second elastic ejector rod (56), the second elastic ejector rod (56) stretches elastically up and down, and when the upper die assembly (4) and the lower die assembly (5) are in an open state, the acute angle male die (52) is driven to move upwards, and the top surface of the acute angle male die (52) and the top surface of the sliding block (9) are on the same horizontal plane.

6. A progressive die for forming shrapnel according to claim 3, wherein: the sliding block (9) is provided with a first inclined surface (91) which extends obliquely to the lower right side, the acute angle male die (52) is provided with a second inclined surface (521) which is consistent with the inclination angle of the first inclined surface (91), the first inclined surface (91) and the second inclined surface (521) are oppositely arranged, and when the upper die assembly (4) and the lower die assembly (5) are folded, the sliding block (9) slides right and forms the acute angle forming cavity (71) with the acute angle male die (52).