Fixed splint 90° bending die set

Abstract

The fixed splint 90° bending die set comprises a die handle, an upper die, a lower die and a table top; the die handle is welded and fixed to the center of the upper die, and the lower die is welded and fixed to the table top; the lower part of the upper die is a punch part, and the punch part is an arc-shaped structure along its length direction; the upper part of the lower die is an arc-shaped groove matching the punch part; the upper die and the lower die constitute an arc-shaped stamping die set corresponding to each other; the width of the arc-shaped punch part is smaller than the width of the arc-shaped groove; on both sides of the arc-shaped groove of the lower die, the upper surface of the concave arc side is lower than the upper surface of the convex arc side; the various components of this assembled tool hoe are separately processed and are universal parts, which are assembled into an integral hoe tool at a later stage, and the assembly process is simple, which enhances the stability of the hoe blade during use, saves resources, has high strength, reduces space occupation, and improves work efficiency and economic benefits.

Description

[0001] This application is a divisional application of the Chinese invention patent application "An assembled tool hoe, a method for making a hoe and a mold".

[0002] Original application number 201710561309.1

[0003] The original application date was 2017.07.11. Technical Field

[0004] The invention relates to a hand tool and a method for manufacturing the hand tool, in particular to a 90-degree bending die set of a fixed splint used in the manufacturing process of an assembled tool hoe. Background Art

[0005] At present, among the commonly used gardening hand tools, the utilization rate of hoes is the highest. Tool hoes have the function of removing weeds. Most of the production processes use a connection method in which the hoe beam and the hoe blade are directly welded together. After a long period of force application, if the welding is not firm, it will break at the welding position. If there is no welding equipment, it can no longer be used and can only be thrown away, resulting in an increase in the cost of use. Although many hoe bodies with reinforcement mechanisms have been introduced, they still continue the integrated structure of the hoe blade. Once a certain position of the hoe blade is damaged, it will affect the overall use effect of the hoe blade.

[0006] In addition, during the production process of hand tools, various product bending molds will be made according to the actual production design of hand tools. Existing bending molds can only meet the conventional single molding needs, or simple product bending with low precision requirements, but cannot meet the needs of products with various shapes and curvatures with high precision requirements. First, if there are several curvatures on a product and the shapes are various, conventional molds cannot realize its processing and production, and it is also difficult to accurately locate the bending angle, depth, etc. If it cannot be accurately positioned, a lot of waste will be generated during the bending and molding process of the product, which greatly reduces the material utilization rate. In addition, the workers' rework and repair of the products will cause a lot of waste of materials and labor, increase the production cost of the product, and reduce the manufacturing profit; secondly, conventional single molds are easy to deform, and many poor matching problems will occur during the assembly and use process, which requires a long time to repair or remake, which will reduce work efficiency, affect production progress, shorten the service life of the mold, and delay order delivery. Summary of the invention

[0007] The present invention is aimed at the defects existing in the existing overall manufacturing process and welding process of the hoe. Firstly, it provides an assembled tool hoe, which can assemble the various components after being processed separately. Secondly, it provides a manufacturing method of the tool hoe and a mold group used in the manufacturing process.

[0008] The technical scheme adopted by the present invention is: an assembled tool hoe, comprising a tool hoe head, a rod and a tail sleeve; the tool hoe head and the rod are connected by a shrink tube, and the tail end of the rod is sleeved with a tail sleeve; the tool hoe head comprises a hoe blade, a fixed clamp, a fastening pressure plate and a hoe beam; the hoe beam is an L-shaped structure, and the bending part of the hoe beam is a circular arc structure with a smooth transition; the fixed clamp is a U-shaped structure, and its sealing end is fixedly connected to the hoe beam, and a fastening pressure plate is arranged at the middle and rear part of the bottom clamp. The hoe blade is a trapezoidal sheet structure, with a notch provided at the central position of the inner side of the hoe blade. The hoe blade is inserted into the fixed splint, and the fastening pressing plate is placed on the top of the hoe blade, and the notch is clamped together with the fastening pressing plate; the other end of the hoe beam is fixedly connected to the small-diameter section of the shrinkage trousers; a wooden core matching its shape is inserted inside the shrinkage trousers; one end of the rod is sleeved on the wooden core and connected and fixed with a connecting piece.

[0009] The contact positions of the hoe blade and the fixed splint are both arc structures that match each other.

[0010] The angle between the hoe beam and the hoe blade is 75-78°.

[0011] The gap between the fixed splints is 2-3mm; the thickness of the hoe blade is 0.8-1mm; the warping height of the fastening pressing plate is 1-1.2mm; the fixed splints, the hoe blade and the fastening pressing plate are pressed and bonded into a whole by a punching machine.

[0012] The fixed clamping plate is an arc-shaped stepped groove structure, the upper clamping plate is a strip-shaped crescent-shaped arc plate structure, and the bottom clamping plate is a trapezoidal arc plate structure. The area of ​​the bottom clamping plate is larger than that of the upper clamping plate.

[0013] The production method of the assembled tool hoe is to follow the steps below:

[0014] A. Material preparation: According to the actual design, prepare the accessory sheet for fixing the splint and the main sheet for making the hoe blade; the main sheet is a trapezoidal structure with a concave notch in the middle of the upper edge; the accessory sheet is a double-section arc plate, that is, the upper splint and the bottom splint of the integrated structure; B. Part production:

[0015] (1) Bend the fixed splint 90°:

[0016] Place the accessory sheet on the fixed clamping plate 90° bending die set. After being stamped by the die, the accessory sheet becomes a 90° right-angle bent plate.

[0017] (2) Bend the fixed splint 45°:

[0018] Place a section of the upper clamping plate of the right-angle bending plate on the fixed clamping plate 45° bending die set. After the die is stamped, the accessory sheet becomes an acute-angle bending plate with an angle of 45;

[0019] (3) Punching holes for the fixed splint:

[0020] Place one end of the bottom clamp of the sharp-angle bent plate on the fixed clamp punching die set, and after the die is punched, punch out a fastening pressing sheet on the bottom clamp;

[0021] (4) Flatten the fixed splint 180°:

[0022] The punched fixed splint is placed on the flattening die set. After being punched by the die, the fixed splint becomes a 180° U-shaped structure.

[0023] (5) Placing the selected hoe beam rod material on the hoe beam bending forming die set, and pressing the die into a hoe beam with a designed curvature;

[0024] C Assembly:

[0025] (1) Weld one end of the hoe beam to the center of the fixed splint;

[0026] (2) After all parts are manufactured, the main body sheet, which serves as the hoe blade, is inserted into the fixed splint. The notch in the center of the main body sheet is stuck on the fastening pressing sheet, and the fastening pressing sheet is pressed on the main body sheet. This part of the structure is placed in the fixed splint flattening die set. After the die is stamped, the fixed splint, the main body sheet and the fastening pressing sheet are firmly flattened into a whole.

[0027] (3) Install the shrink tube and the rod on the hoe beam in sequence.

[0028] As a preferred embodiment: a fixed splint 90° bending die set comprises a die handle, an upper die, a lower die and a table; the die handle is welded and fixed to the center of the upper die, and the lower die is welded and fixed to the table;

[0029] The lower part of the upper mold is a male mold part, and the male mold part is an arc-shaped structure along its length direction;

[0030] The upper part of the lower mold is an arc-shaped groove matching the punch part; the upper mold and the lower mold constitute a corresponding arc-shaped stamping mold group that is embedded in each other; the width of the arc-shaped punch part is smaller than the width of the arc-shaped groove; on both sides of the arc-shaped groove of the lower mold, the upper surface of the concave arc side is lower than the upper surface of the convex arc side.

[0031] As a preferred embodiment: a fixed splint 45° bending die set includes a die handle, an upper die, a lower die and a table; the die handle is welded and fixed to the center of the upper die, and the lower die is welded and fixed to the table;

[0032] The lower part of the upper mold is a punch part with a 45° inclined surface on one side, and the punch part is an arc-shaped structure along its length direction; the upper part of the lower mold is provided with an arc-shaped groove matching the punch part along its length direction; the outer side surface of the groove is lower than the inner side surface, and the groove body is an inclined groove of 45° along its depth direction; the upper mold and the lower mold constitute a corresponding arc-shaped stamping mold group that is embedded in each other; the width of the arc-shaped punch part is smaller than the width of the arc-shaped groove.

[0033] As a preferred embodiment: a fixed splint punching die set includes a die handle, a punch needle, a material stripping sleeve, a lower die upper platen and a lower die lower platen; the punch needle is embedded and fixed in the central position below the die handle, and the material stripping sleeve is movably sleeved on the outside of the punch needle; an arc groove is provided on the side surface of the lower die upper platen along its length direction, and the bottom and side surfaces of the arc groove are respectively flat, and the upper surface is a 45° inclined surface; a groove is provided at the central position of the upper surface of the lower die upper platen, and the shape of the groove is the same as the cross-sectional shape of the punched part; the punch needle is aligned with the groove up and down.

[0034] As a preferred embodiment: the hoe beam bending forming die set includes a die handle, an upper die, a lower die and a table; the die handle is welded and fixed to the center of the upper die, and the lower die is welded and fixed to the table; the upper die is a convex die, the lower die is a concave die, the upper die and the lower die form an arc-shaped die set of a corresponding L-shaped structure that is mutually embedded, and the bending angle of the arc is 75-78°

[0035] The assembled tool hoe disclosed in the present invention has various components that are processed separately and are universal parts. After being assembled into an integral hoe tool, if a component is damaged, a new component can be used to replace it in time, thereby extending the service life of the tool. The assembly process is simple, and the stability of the hoe blade during use is enhanced, so that the tool hoe has the functions of shoveling, hoeing, scraping, and leveling.

[0036] It has multiple functions and is suitable for gardening operations, interior decoration and other purposes. It overcomes the defects of this type of traditional welding process, such as one-time use and easy detachment of the hoe blade. It saves resources, has high strength and reduces space occupation, while improving work efficiency and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the overall structure of the tool hoe in the present invention.

[0038] Figure 2 for Figure 1 Side view of.

[0039] Figure 3 A schematic diagram of the installation structure for fixing the splint and the hoe blade.

[0040] Figure 4 Schematic diagram of the installation position of the wooden core in the tool hoe.

[0041] Figure 5 It is a schematic diagram of the installation position of the fastening pressing plate and the hoeing plate.

[0042] Figure 6 This is a schematic diagram of the structure of the hoe beam.

[0043] Figure 7 This is a schematic diagram of the installation position of the hoe beam and the fixed splint.

[0044] Figure 8 Exploded view of the fixed splint punching die set.

[0045] Fig. 9 for Figure 8 Side view of.

[0046] Fig.10 It is a schematic diagram of the overall structure of the fixed splint punching die set.

[0047] Fig.11 Exploded view of the clamping die set for fixing the splint.

[0048] Fig.12 for Fig.11 Side view of.

[0049] Fig.13 It is a schematic diagram of the overall structure of the fixed splint flattening die set.

[0050] Fig.14 This is the exploded view of the hoe beam bending and forming die set.

[0051] Fig.15 for Fig.14 Side view of.

[0052] Fig.16 It is a schematic diagram of the overall structure of the hoe beam bending and forming die set.

[0053] Fig.17 Exploded view of the 90° bending die set for fixing the splint.

[0054] Fig.18 for Fig.17 Side view of.

[0055] Fig.19 It is a schematic diagram of the overall structure of the fixed splint 90° bending die set.

[0056] Fig. 20 This is an exploded view of the 45° bending die set for fixing the splint.

[0057] Fig.21 for Fig. 20 Side view of.

[0058] Fig. 22It is a schematic diagram of the overall structure of the fixed splint 45° bending die set.

[0059] Fig.23 It is a schematic structural diagram of the main body sheet in the present invention.

[0060] Fig.24 It is a schematic diagram of the structure of the accessory sheet in the present invention.

[0061] Fig.25 This is a front view of the accessory sheet of the present invention after being bent 90 degrees.

[0062] Fig.26 for Fig.25 Top view.

[0063] Fig. 27 for Fig.25 Side view.

[0064] Fig.28 This is a front view of the accessory sheet of the present invention after being bent 135 degrees.

[0065] Fig.29 for Fig.28 Top view of the .

[0066] Fig.30 for Fig.28 Side view of.

[0067] In the figure: tail sleeve 1, rod 2, shrinkage pants 3, hoe beam 4, screw nail 5, hoe piece 6, fixed splint 7, wooden core 8, fastening pressing plate 9, fixed splint punching die set 10, fixed splint flattening die set 11, hoe beam bending and forming die set 12, fixed splint 90° bending die set 13, fixed splint 45° bending die set 14. DETAILED DESCRIPTION

[0068] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0069] See attached Figure 1-7 The assembled tool hoe disclosed in the present invention comprises a tool hoe head, a rod and a tail sleeve. The tool hoe head and the rod are connected by a shrink tube, and the tail end of the rod is sleeved with a tail sleeve. Preferably, the tail sleeve is a plastic sleeve with holes.

[0070] The tool hoe head includes a hoe blade, a fixed clamp, a fastening plate and a hoe beam. The hoe beam is an L-shaped structure, and the bending part of the hoe beam is a circular arc structure with a smooth transition. The fixed clamp is a U-shaped structure, and its sealing end is fixedly connected to the hoe beam. A fastening plate is provided at the middle and rear part of the bottom clamp; one end of the fastening plate is connected to the clamp as a whole, and the other end is a split plate that is cut and tilted upward.

[0071] The hoe blade is a trapezoidal sheet structure with a notch at the central position of the inner side of the hoe blade. The hoe blade is inserted into the fixed splint, and the fastening pressing plate is placed on the top of the hoe blade. The notch is clamped together with the fastening pressing plate, and the fastening pressing plate is placed in the notch. Preferably, the fastening pressing plate and the notch are clamped together in the form of an interference fit.

[0072] The contact position of the hoe blade and the fixed splint are both matched arc structures. The angle between the hoe beam and the hoe blade is 75-78 degrees. The other end of the hoe beam is fixedly connected to the small diameter section of the shrinkage trousers. A wooden core matching its shape is inserted inside the shrinkage trousers. One end of the rod is sleeved on the wooden core and connected and fixed by a connector.

[0073] The hoe trousers with a tightening taper are called shrink trousers, which are 115-125mm long and have a painted fiber handle. The end of the shrink trousers that is assembled with the rod is not shrunken, and its length is 45-55mm. The inner diameter of the shrink trousers matches the outer diameter of the rod, and the other end is closed, with a taper of 6-8°, and is firmly welded to the hoe beam. The angle between the hoe beam and the hoe blade is designed to be 75-78°, which is just right for the operator to apply force; the wood core is assembled into the shrink trousers, one end of which is 15-20mm away from the edge of the hoe beam, and the other end is connected to the rod.

[0074] The gap between the fixed splints is 2-3mm; the thickness of the hoe blade is 0.8-1mm; the warping height of the fastening pressing plate is 1-1.2mm; the fixed splints, the hoe blade and the fastening pressing plate are pressed and bonded into a whole by a punching machine.

[0075] In this embodiment, the stainless steel hoe blade connected to the fixed clamping plate is trapezoidal and is arranged at a certain angle with the hoe beam. The fixed clamping plate is a circular arc ladder-shaped groove structure, the upper clamping plate is a crescent-shaped arc plate structure, and the bottom clamping plate is a trapezoidal arc plate structure, and the area of ​​the bottom clamping plate is larger than that of the upper clamping plate.

[0076] First, the length and angle of the hoe beam are designed, and then the angle between the fixed splint and the hoe beam is designed; the shrink tube pants are formed to have a conical shape. The cutting length of the hoe beam is 150-160mm, and it is pressed into a bow shape according to the angle designed by the mold. The fixed splint is designed to be able to embrace the hoe blade, and the width of the hoe blade is 170-180mm. The material used is stainless steel 301, with a thickness of 0.8-1.0mm, which is durable.

[0077] The material hardness is HRC34-45, which can meet the strength requirements of users. The middle gap of the fixed splint is 2.0-3.0mm. The trapezoidal hoe blade is installed in the fixed splint. The clamp is first punched out by the punching equipment between the fastening pressing plates, and then the fixed splint, hoe blade, and fastening pressing plate are firmly flattened by the punching equipment to prevent loosening; the rod, shrink tube pants, and wooden core are firmly fixed with galvanized screw nails to prevent the handle from falling off during use. A plastic tail sleeve with a hole 1 is installed at the end of the rod. Its function is to prevent the operator's hand from being injured when the tool controls the movement. After use, the hole of the plastic tail sleeve with a hole is inserted into the wall fixture to hang the tool, thereby saving the space occupied by the tool.

[0078] The fixed splint, the fastening pressing plate, the hoe beam and the like in the assembled tool hoe are all made of different mold sets, and then assembled into a whole.

[0079] The process of making a tool hoe is:

[0080] A. Material preparation: punching, according to the actual design, prepare the accessory sheet for fixing the splint and the main sheet for making the hoe blade, such as the attached Figure 23-24 shown.

[0081] The main body profile is a trapezoidal structure with a concave notch in the center of the upper edge. The accessory profile is a double-section arc plate, namely, an upper splint and a bottom splint of an integrated structure. In the finished product, the fixed splint made of the accessory profile environmentally holds the hoe blade made of the main body profile.

[0082] B part production:

[0083] (1) Bend the fixed splint 90°:

[0084] Place the accessory sheet on the fixed clamping plate 90° bending die set, and place the upper clamping plate part of the accessory sheet horizontally on the arc groove surface of the lower die. The arc structure of the accessory sheet matches the arc structure of the arc groove of the lower die. Since the inner side surface of the arc groove of the lower die is higher than the outer side surface, the arc part of the accessory sheet is blocked by the high inner side surface.

[0085] After being punched by the upper die, the convex die portion of the upper die punches the upper clamping plate portion of the accessory sheet into a 90° right-angle bent plate.

[0086] The fixed clamp plate 90° bending die set comprises a die handle 13-1, an upper die 13-2, a lower die 13-3 and a table 13-4; the die handle is welded and fixed to the center of the upper die, and the lower die is welded and fixed to the table.

[0087] The mold set structure is as attached Figure 17-19The lower part of the upper die is a convex die part, which is an arc-shaped structure along its length. The upper part of the lower die is an arc-shaped groove matching the convex die part. The upper die and the lower die constitute a corresponding arc-shaped stamping die set that is mutually embedded; the width of the arc-shaped convex die part is smaller than the width of the arc-shaped groove, and a gap equal to the thickness of the accessory sheet is set between the two; on both sides of the arc-shaped groove of the lower die, the upper surface of the concave arc side is lower than the upper surface of the convex arc side.

[0088] During the mold design process, the width of the arc groove of the lower mold determines the width of the upper clamping plate after the accessory sheet is bent 90 degrees. Figure 25-27 In the shape shown, the upper clamping plate is a strip-shaped arc structure bent along the fold, and the whole plate is perpendicular to the plate body where the bottom clamping plate is located.

[0089] (2) Bend the fixed splint 45°:

[0090] Place the right-angle bending plate on the fixed clamping plate 45° bending die set, with its bottom clamping plate fitting the outer side of the lower die, and its upper clamping plate placed on the arc groove surface of the lower die. After being stamped by the die, the accessory sheet becomes a sharp-angle bending plate with an angle of 45.

[0091] See attached Figure 20-22 , a fixed splint 45° bending die set includes a die handle 14-1, an upper die 14-2, a lower die 14-3 and a table 14-4; the die handle is welded and fixed to the center of the upper die, and the lower die is welded and fixed to the table. The lower part of the upper die is a convex die part with a 45° inclined surface on one side, and the convex die part is an arc-shaped structure along its length. The upper part of the lower die is provided with an arc-shaped groove matching the convex die part along its length; the outer side of the groove is lower than the inner side, and the groove body is a 45° inclined groove along its depth direction. The upper die and the lower die constitute a corresponding arc-shaped stamping die set that is mutually embedded.

[0092] Place one right-angle side of the right-angle bent plate close to the inner side of the arc groove, and place the other right-angle side horizontally on the groove surface of the arc groove. Preferably, the bottom clamping plate to be punched is close to the inner side of the arc groove, and the upper clamping plate is placed horizontally on the groove surface. During the pressing process of the upper mold, the 45° inclined surface of the upper mold presses the horizontal upper clamping plate down into a 45° inclined plate, pressing the entire angle plate down.

[0093] After the 45-degree bending process, the main structure of the accessory sheet is as follows: Figure 28-30 In the shape shown, a 45-degree angle plate is formed between the upper clamping plate and the bottom clamping plate, thus completing the 135-degree angle bend of the plate body.

[0094] (3) Punching holes for the fixed splint:

[0095] One end of the bottom clamp of the sharp-angle bending plate is placed on the fixed clamp punching die set, and after the die is punched, a fastening pressing sheet is punched out on the bottom clamp.

[0096] See attached Figure 8-10 The fixed splint punching die set includes a die handle 10-1, a punch needle 10-2, a material stripping sleeve 10-3, a lower die upper platen 10-4 and a lower die lower platen 10-5. The punch needle is inlaid and fixed in the central position below the die handle, and the material stripping sleeve is movably sleeved on the outside of the punch needle. The rubber round rod (material stripping) is cut into the same length as the exposed punch needle and installed on the punch needle to play the role of material stripping after punching, which is the material stripping sleeve.

[0097] The side of the upper platen of the lower die is provided with an arc groove along its length direction. The bottom and side surfaces of the arc groove are respectively flat, and the top surface is a 45° inclined surface. A groove is provided in the center of the upper surface of the upper platen of the lower die. The shape of the groove is the same as the cross-sectional shape of the punched part; the punching needle is aligned with the groove up and down.

[0098] After being bent at 135 degrees, the accessory profile is an angle plate with an included angle of 45 degrees. The upper clamping plate is placed in the arc groove and fits with the inclined surface of the arc groove. The bottom clamping plate is horizontally placed on the upper platen of the lower die. After being stamped by the upper die, a fastening clamping plate is stamped out on the bottom clamping plate. One end of the fastening clamping plate is connected to the bottom clamping plate as a whole, and the other end is a semi-hollow structure stamped by a punching needle.

[0099] After punching, the fixed splint flattening die set is used to press the corner plate with a 45-degree angle to complete the 180-degree bending of the plate body, thereby achieving a parallel position relationship between the upper and lower plates of the fixed splint.

[0100] (4) The selected hoe beam rod material is placed on the hoe beam bending forming die set, and is pressed into a hoe beam with a designed curvature through the stamping of the die.

[0101] The hoe beam bending forming die set includes a die handle, an upper die, a lower die and a table top; the die handle is welded and fixed to the center of the upper die, and the lower die is welded and fixed to the table top; the upper die is a convex die, and the lower die is a concave die. The upper die and the lower die form an arc-shaped die set of L-like structure that are embedded in each other and correspond to each other, and the bending angle of the arc is 75-78°.

[0102] C Assembly:

[0103] (1) Weld one end of the hoe beam to the center of the fixed splint; most of the assembly is now complete, spray paint each component, and then proceed to final assembly;

[0104] (2) After the parts are manufactured, they are spray-painted; the main body sheet, which serves as the hoe blade, is inserted into the fixed clamping plate that has been pressed 180 degrees, wherein the notch in the center of the main body sheet is stuck in the raised position of the fastening clamping plate, and the fastening clamping plate is pressed on the main body sheet. This part of the structure is placed in the fixed clamping plate flattening mold set. As a preferred method, it is best to set a limit stop in the flattening mold set.

[0105] The fixing splint and the fastening pressing sheet are placed on the lower die of the flattening die set. After being stamped by the upper die, the fixing splint, the main body sheet and the fastening pressing sheet are firmly flattened into a whole, and the pressing is completed;

[0106] (3) Install the shrink tube and the rod on the hoe beam in sequence.

Claims

1. A fixed splint 90° bending die set, characterized in that: It includes a mold handle, an upper mold, a lower mold and a table; the mold handle is welded and fixed to the center of the upper mold, and the lower mold is welded and fixed to the table; The lower part of the upper mold is a male mold part, and the male mold part is an arc-shaped structure along its length direction; The upper part of the lower die is an arc-shaped groove matching the punch part; the upper die and the lower die constitute a corresponding arc-shaped stamping die set which is mutually embedded; The width of the arc-shaped convex part is smaller than the width of the arc-shaped groove; On both sides of the arc-shaped groove of the lower mold, the upper surface of the concave arc side is lower than the upper surface of the convex arc side; The accessory profile is a double-section arc-shaped plate, i.e., an upper clamping plate and a bottom clamping plate of an integral structure; Place the accessory sheet on the fixed clamping plate 90 ° bending die set, and the upper clamping plate part of the accessory sheet is placed horizontally On the arc-shaped groove surface of the lower die, the arc-shaped structure of the accessory sheet matches the arc-shaped structure of the arc-shaped groove of the lower die; After the upper die is stamped, the punch of the upper die stamps the upper clamping plate of the accessory sheet into a 90° straight Corner bend plate.

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