Steel fireproof door processing device and processing method

Abstract

This invention relates to the field of metal product processing equipment, specifically to a steel fire door processing device and method. It includes a lower mold and an upper mold located above the lower mold, with an upper mold mounting plate on the top of the upper mold. The top surface of the lower mold has a cavity and a feeding groove, with the cavity located in the center of the feeding groove. Trimming and blanking grooves are formed on both sides of the feeding groove, creating a flanging support platform between the trimming and blanking grooves and the cavity. Multiple punches communicating with the cavity are provided on the outer side of the lower mold. A punching mechanism is installed on the lower mold; after bending, the punching mechanism punches the vertical bend of the door panel. A stamping head is installed at the bottom of the upper mold, with multiple clearance holes corresponding to the punches. Trimming mechanisms are installed on both sides of the upper mold; in the mold-closed state, the trimming mechanisms cut off excess sheet metal along the flanging support platform. This invention, through structural innovation and process integration, provides a new solution for processing steel fire doors that is efficient, precise, space-saving, automated, and economical.

Description

Technical Field

[0001] This invention relates to the field of metal product processing equipment technology, and in particular to a steel fire door processing device and processing method. Background Technology

[0002] As an important fire-resistant partition component in buildings, the production quality of steel fire doors directly affects the reliability of their fire resistance performance. The processing of steel fire door panels mainly relies on decentralized and independent processes and general-purpose equipment. The typical process flow is as follows: First, the operator places the raw material at the laser cutting station, where it is cut to specific dimensions using laser cutting, and holes or grooves are made using laser cutting. Then, the door panel blank is transferred to the bending station, where the edges on both sides are bent using a bending machine to form the initial three-dimensional structure of the door leaf.

[0003] Traditional processing methods involve core processes such as bending, drilling, and cutting being completed on different equipment. Workpieces require multiple clamping, positioning, and handling, which not only increases the production cycle of a single product but also occupies a large amount of workshop space and manpower. Furthermore, the positioning reference is changed multiple times, making it difficult to guarantee accuracy. In addition, equipment with multiple processes occupies a large area and has a long investment return cycle. Summary of the Invention

[0004] The purpose of this invention is to address the problems in the prior art, such as multiple clamping of workpieces, low production efficiency, difficulty in ensuring accuracy, and large equipment footprint, by proposing a steel fire door processing device and processing method.

[0005] On one hand, the present invention proposes a steel fire door processing device, including a lower mold and an upper mold located above the lower mold. An upper mold mounting plate is provided on the top of the upper mold. A cavity and a feeding groove are provided on the top surface of the lower mold. The cavity is located in the middle of the feeding groove. Trimming and blanking grooves are opened on both sides of the feeding groove. A flanging support platform is formed between the trimming and blanking grooves and the cavity. Multiple punches communicating with the cavity are provided on the outer side of the lower mold. A punching mechanism is provided on the lower mold. After bending, the punching mechanism moves to punch the vertical bend of the door panel. A punching head is provided at the bottom of the upper mold. Multiple clearance holes opposite to the punches are provided on the punching head. Trimming mechanisms are provided on both sides of the upper mold. In the mold closing state, the trimming mechanism moves to cut off the excess sheet material along the flanging support platform.

[0006] Preferably, the bottom of the cavity is provided with multiple vertical holes, the bottom of the lower mold is provided with an embedded plate, the embedded plate is provided with multiple springs, and each spring is provided with a push rod at the top, the push rods cooperate to pass through the vertical holes.

[0007] Preferably, the punching mechanism includes a connecting plate a slidably disposed on the outer wall of the lower die along the punching direction, a punching component disposed on the connecting plate a and inserted into the punching hole, a mounting seat disposed on the outer wall of the lower die, and a telescopic device a disposed on the mounting seat and pushing the connecting plate a to move.

[0008] Preferably, the trimming mechanism includes a telescopic device b disposed vertically at the bottom of the upper mold mounting plate, and a trimming plate disposed at the telescopic end of the telescopic device b.

[0009] Preferably, during the bending process, the punches on the vertical surface of the cavity are completely filled by the punching mechanism, ensuring the integrity of the vertical bending surface of the cavity. During the bending process, the clearance holes on the upper die are also filled.

[0010] Preferably, an installation groove is provided on the top surface of the upper die, and a filling component is slidably placed in the installation groove. The filling component is inserted into the clearance hole provided on the upper die, forming a complete bending working surface in the bending state.

[0011] Preferably, a sliding plate is slidably installed vertically within the mounting groove, and a lifting device is vertically installed at the bottom of the upper mold mounting plate, with the bottom telescopic end of the lifting device connected to the sliding plate; a fixed seat is installed on the inner wall of the bottom of the mounting groove, and a bent pipe is installed on the fixed seat. A piston rod a and a piston rod b are respectively installed in the horizontal and vertical sections of the bent pipe. A connecting plate b is slidably installed within the mounting groove, and all filling parts are connected to the connecting plate b. The connecting plate b is connected to the piston rod a, and the top of the piston rod b is connected to the bottom of the sliding plate. Hydraulic oil is contained in the bent pipe and between the piston rod a and the piston rod b.

[0012] On the other hand, the present invention proposes a method for processing steel fire doors, comprising the following steps: S1. Place the cut door panel blank into the material feeding groove of the lower mold; S2. Start the hydraulic system to drive the upper die to move downward, and at the same time control the lifting device to extend, push the slide plate down, and push all the filling parts to move outward, so that the filling parts are inserted into the clearance holes on the upper die to form a complete bending working surface; the upper die continues to press down to the mold closing state, at which time the punch head and the cavity cooperate to complete the bending of both sides of the door panel; S3. In the mold closed state, the edge is trimmed, and the trimmed waste falls into the trimming waste groove; S4. Keep the upper mold in the closed state, control the lifting device to retract and pull the filling part inward, so that the clearance hole on the punch head opens; then the punching mechanism moves to complete the punching operation of the hinge hole and lock hole on the vertical bend of the door panel, and the waste generated by punching is pushed into the clearance hole of the punch head. S5. After punching is completed, the punching mechanism is reset, and then the hydraulic system is controlled to drive the upper die to move upward and reset. At the same time, the lifting device is controlled to extend again, pushing the filling part to move outward, pushing out the punching waste that is stuck in the clearance hole and falling onto the workpiece. S6. After the upper mold is fully reset, the operator removes the workpiece with punching waste as a whole, and then removes the waste from the trimming and blanking groove to complete the single-piece processing.

[0013] Compared with the prior art, the present invention has the following beneficial technical effects: 1. High integration, significantly improving processing efficiency: Through the coordinated design of the cavity and punching mechanism on the lower die, and the punching head, trimming mechanism, and filling parts on the upper die, multiple core processes such as cutting, bending, and punching, which are scattered in the traditional process flow, are integrated into a single mold closing action. The workpiece only needs to be positioned and clamped once to complete edge bending, hinge hole / lock hole punching, and trimming of excess sheet metal, which greatly shortens the production cycle of a single product and significantly improves production efficiency; 2. Improved Product Quality: The workpiece is positioned using the same locating datum throughout the entire processing. This effectively eliminates the cumulative errors caused by datum conversion in traditional multi-process and multi-clamping methods, ensuring the dimensional accuracy, bending angle, and hole position accuracy of the door leaf. In particular, the filling of the clearance holes during bending by the filling component ensures the integrity of the bending surface during the forming process, contributing to a higher quality bending structure. 3. Optimized production layout: This integrated device concentrates the functions of multiple independent machines into one, significantly reducing the equipment footprint and the turnover space for workpieces between different machines. At the same time, by reducing intermediate steps such as workpiece handling and clamping, it lowers the number of operators required and reduces labor intensity, facilitating a more compact and efficient production line layout. 4. Reduced Costs: Compared to traditional solutions that require the purchase of multiple machines such as laser cutting machines, bending machines, and punching machines, the integrated device of this invention reduces the initial investment in equipment. Simultaneously, due to increased production efficiency, reduced floor space, lower labor costs, and decreased scrap rates resulting from improved quality consistency, overall production costs are effectively controlled, and the investment payback period for the equipment is significantly shortened. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of one embodiment of the present invention; Figure 2 This is a schematic diagram of the lower mold structure; Figure 3 This is a schematic diagram of the upper mold structure; Figure 4 for Figure 2 A structural diagram from another perspective; Figure 5 This is a schematic diagram of the internal structure of the upper mold; Reference numerals: 1. Lower mold; 2. Cavity; 3. Flanging support platform; 4. Trimming and blanking groove; 5. Discharge groove; 6. Ejector rod; 7. Upper mold mounting plate; 8. Connecting frame; 9. Upper mold; 10. Limiting post; 11. Guide post; 12. Punching part; 13. Connecting plate a; 14. Guide rod a; 15. Mounting seat; 16. Telescopic device a; 17. Embedded plate; 18. Punching head; 19. Filling part; 20. Piston rod a; 21. Bend; 22. Piston rod b; 23. Guide rod c; 24. Connecting plate b; 25. Slide plate; 26. Lifting device; 27. Guide rod b; 28. Telescopic device b; 29. ​​Trimming plate. Detailed Implementation

[0015] Example 1; as Figure 1 and Figure 4 As shown, the present invention proposes a steel fire door processing device, including a lower mold 1 and an upper mold 9 located above the lower mold 1. An upper mold mounting plate 7 is provided on the top of the upper mold 9, and a connecting frame 8 is provided on the top of the upper mold mounting plate 7. The connecting frame 8 is connected to a hydraulic system, thereby driving the upper mold 9 to move up and down. Vertically opposing limiting posts 10 are provided on the top of the lower mold 1 and the bottom of the upper mold mounting plate 7. In the mold-closed state, the two limiting posts 10 are in contact. A guide post 11 is vertically provided on the lower mold 1, and a guide hole is provided on the upper mold mounting plate 7 for the guide post 11 to pass through. A cavity 2 and a feeding groove 5 are provided on the top surface of the lower mold 1. The cavity 2 is located in the middle of the feeding groove 5, and the feeding groove... Both sides of the groove 5 are provided with trimming and blanking grooves 4. The trimming and blanking grooves 4 and the cavity 2 form a flange support platform 3. The outer side of the lower mold 1 is provided with multiple punches that communicate with the cavity 2. These are used to make hinge holes, lock holes, etc. on the door panel bending. The lower mold 1 is provided with a punching mechanism. After the bending is completed, the punching mechanism moves to punch the vertical bend of the door panel. The bottom of the upper mold 9 is provided with a punching head 18. The punching head 18 is provided with multiple clearance holes that are opposite to the punches. The clearance holes are opposite to the punches, provided that the mold is closed. The upper mold 9 is provided with trimming mechanisms on both sides. In the mold closed state, the trimming mechanisms move to cut off the excess sheet material along the flange support platform 3.

[0016] Furthermore, the bottom of cavity 2 is provided with multiple vertical holes, and the bottom of the lower mold 1 is provided with an embedded plate 17. Multiple springs are provided on the embedded plate 17, and each spring is provided with a push rod 6 at the top. The push rod 6 passes through the vertical hole. When the upper mold 9 is pressed down, the push rod 6 is pressed into the vertical hole. When the upper mold 9 moves up to reset, the push rod 6 moves upward under the action of the spring to push out the workpiece, realizing automatic ejection and making it convenient for the operator to remove the workpiece.

[0017] Example 2; as Figure 2As shown, the present invention proposes a steel fire door processing device. Compared with Embodiment 1, this embodiment details the structure of the punching mechanism. Specifically, the punching mechanism includes a connecting plate a13 slidably disposed on the outer wall of the lower die 1 along the punching direction, a punching member 12 disposed on the connecting plate a13 and inserted into the punching hole, a mounting seat 15 disposed on the outer wall of the lower die 1, and a telescopic device a16 disposed on the mounting seat 15 and pushing the connecting plate a13 to move. In an optional embodiment, the lower die 1 is provided with a plurality of guide rods a14, and the connecting plate a13 is provided with guide holes for the guide rods a14 to pass through. The telescopic device a16 is a cylinder or a hydraulic cylinder. When the telescopic device a16 is retracted, the punching member 12 is retracted into the punching hole. When the telescopic device a16 is extended, the punching member 12 extends into the clearance hole on the punching head 18 after completing the punching.

[0018] Example 3; as Figure 3 As shown, this invention proposes a steel fire door processing device. Compared with Embodiment 1, this embodiment details the structure of the edge-cutting mechanism. The edge-cutting mechanism includes a telescopic device b28 vertically disposed at the bottom of the upper mold mounting plate 7, and an edge-cutting plate 29 disposed at the telescopic end of the telescopic device b28. The edge-cutting plate 29 cuts the workpiece along the outer edge of the flange support platform 3. The telescopic device b28 is a cylinder or a hydraulic cylinder. In this application, the telescopic device b28 is a hydraulic cylinder. In addition, in order to improve the edge-cutting operation stability of the edge-cutting plate 29, multiple vertical guide rods b27 are provided on the edge-cutting plate 29, and multiple guide holes for the guide rods b27 to pass through are provided on the upper mold mounting plate 7. There are two sets of edge-cutting mechanisms, which cut the flanges at the top of the two bends of the workpiece respectively.

[0019] Example 4; as Figure 1 and Figure 5 As shown, the steel fire door processing device proposed in this invention, compared with Embodiment 1, details the relevant bending structure. Specifically, during the bending process, the punching holes on the vertical surface of the cavity 2 are completely filled by the punching mechanism to ensure the integrity of the vertical bending surface of the cavity 2. During the bending process, the clearance holes on the upper die 9 are also filled. After the bending is completed and the die is closed, the clearance holes are opened, the punching mechanism punches, and the punching waste is pushed into the clearance holes. Subsequently, during the demolding process, the clearance holes are filled again to push out the punching waste and drop it onto the workpiece. The operator needs to remove the punching waste and the workpiece together.

[0020] An installation groove is provided on the top surface of the upper die 9, and a filling part 19 is slidably installed in the installation groove. The filling part 19 is inserted into the clearance hole provided on the upper die 9, forming a complete bending working surface in the bending state.

[0021] A sliding plate 25 is vertically slidable within the mounting groove. A lifting device 26 is vertically installed at the bottom of the upper mold mounting plate 7, with its bottom telescopic end connected to the sliding plate 25. A fixed seat is installed on the inner wall of the bottom of the mounting groove, and a bent pipe 21 is installed on the fixed seat. The bent pipe 21 is a 90-degree bend with an arc transition at the turning point. A piston rod a20 and a piston rod b22 are respectively installed in the horizontal and vertical sections of the bent pipe 21. A connecting plate b24 is slidably installed within the mounting groove. Specifically, multiple guide rods c23 are installed within the mounting groove, and multiple through holes are provided on the connecting plate b24 for the guide rods c23 to pass through. All the filling parts 19 are connected to the connecting plate b24. The connecting plate b24 is connected to the piston rod a20, and the top of the piston rod b22 is connected to the bottom of the sliding plate 25. The bent pipe 21 contains, between the piston rod a20 and the piston rod b22, a... Hydraulic oil is present; the lifting device 26 is a cylinder or hydraulic cylinder. In the bending state, the lifting device 26 extends and pushes the slide plate 25 down. It pushes the filling part 19 outward through the piston rod b22, hydraulic oil, piston rod a20 and connecting plate b24 in sequence. When the connecting plate b24 abuts against the inner wall of the mounting groove, the filling part 19 fills the clearance hole on the punch head 18. After the bending is completed and the mold is closed, the lifting device 26 retracts and drives the slide plate 25 to move upward. It pulls the filling part 19 inward through the piston rod b22, hydraulic oil, piston rod a20 and connecting plate b24 in sequence. Then the punching part 12 extends to punch. The punching waste enters the clearance hole of the punch head 18. The punching part 12 retracts and resets. During the upward movement of the upper mold 9, the lifting device 26 extends again, and the filling part 19 punching waste is pushed out and falls onto the workpiece.

[0022] Example 5; The present invention proposes a method for processing steel fire doors, using the steel fire door processing device of Example 4, specifically including the following steps: S1. Place the cut door panel blank into the material feeding groove 5 of the lower mold 1, and align the center area of ​​the blank with the cavity 2. S2. Start the hydraulic system to drive the connecting frame 8 to move the upper mold 9 downward. At the same time, control the lifting device 26 to extend and push the slide plate 25 down. Through the piston rod b22, the hydraulic oil in the bend 21, the piston rod a20 and the connecting plate b24, push all the filling parts 19 to move outward, so that the filling parts 19 are inserted into the clearance holes on the upper mold 9 to form a complete bending working surface. The upper mold 9 continues to press down to the mold closing state, and the upper and lower limit posts 10 contact each other. At this time, the punch head 18 cooperates with the cavity 2 to complete the bending of both sides of the door panel. The punch holes on the vertical surface of the cavity 2 are completely filled by the punching parts 12 in the punching mechanism to ensure the integrity of the bending surface. S3. In the mold closing state, control the telescopic device b28 to drive the trimming plate 29 to move downward along the outer edge of the flange support table 3 to trim the excess plate material at the top of the bending on both sides of the workpiece, and the trimming waste falls into the trimming waste groove 4. S4. Keep the upper mold 9 in the closed state, control the lifting device 26 to retract, drive the slide plate 25 to move upward, and pull the filling part 19 inward through the piston rod b22, hydraulic oil, piston rod a20 and connecting plate b24, so that the clearance hole on the punch head 18 opens; then the punching mechanism operates, control the telescopic device a16 to extend, push the connecting plate a13 and the punching part 12 to move in the punching direction, and complete the punching operation of the hinge hole and lock hole on the vertical bend of the door panel. The waste material generated by punching is pushed into the clearance hole of the punch head 18. S5. After punching is completed, the punching mechanism is reset, that is, the telescopic device a16 is controlled to retract, so that the punched part 12 is returned to the punching hole, and the filling of the vertical surface of the cavity 2 is restored; then the hydraulic system is controlled to drive the upper die 9 to move upward and reset, while the lifting device 26 is controlled to extend again, pushing the filling part 19 to move outward, pushing out the punching waste that is stuck in the clearance hole and falling onto the workpiece. S6. After the upper mold 9 is fully reset, the ejector rod 6 moves upward under the action of the spring to eject the workpiece out of the discharge groove 5. The operator removes the workpiece with punching waste as a whole, and then removes the waste in the trimming discharge groove 4 to complete the single-piece processing.

[0023] In summary, this invention integrates multiple core processes such as cutting, bending, and punching, which are scattered in traditional processes, into a single mold closing action through the coordinated design of the cavity 2 and punching mechanism on the lower mold 1, and the punching head 18, trimming mechanism, and filling component 19 on the upper mold 9. The workpiece only needs one positioning and clamping to complete edge bending, hinge hole / lock hole punching, and excess sheet trimming, significantly shortening the production cycle of a single product and greatly improving production efficiency. The workpiece is positioned using the same positioning datum throughout the entire processing. This effectively eliminates the cumulative error caused by traditional multi-process, multi-clamping positioning, ensuring the dimensional accuracy, bending angle, and hole position accuracy of the door leaf. In particular, the filling component 19 fills the clearance holes during bending, ensuring the integrity of the bent surface during the forming process and contributing to a higher quality bent structure. This integrated device concentrates the functions of multiple independent devices into one, significantly reducing the equipment footprint and the workpiece's turnover space between different devices. Meanwhile, by reducing intermediate steps such as workpiece handling and clamping, the required number of operators and labor intensity are lowered, facilitating a more compact and efficient production line layout. Compared to traditional solutions that require multiple machines such as laser cutting machines, bending machines, and punching machines, the integrated device of this invention reduces the initial equipment investment. Furthermore, due to increased production efficiency, reduced floor space, lower labor costs, and decreased scrap rates resulting from improved quality consistency, overall production costs are effectively controlled, and the investment payback period is significantly shortened. In summary, this invention, through structural innovation and process integration, solves a series of problems in traditional steel fire door processing methods, such as dispersed processes, low efficiency, poor precision, large floor space, and high costs, providing a new, efficient, precise, land-saving, automated, and economically sound solution for steel fire door processing.

[0024] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A steel fire door processing device, comprising a lower mold (1) and an upper mold (9) located above the lower mold (1), wherein an upper mold mounting plate (7) is provided on the top of the upper mold (9); characterized in that, The lower mold (1) has a cavity (2) and a feeding groove (5) on its top surface. The cavity (2) is located in the middle of the feeding groove (5). The feeding groove (5) has a cutting groove (4) on both sides. The cutting groove (4) and the cavity (2) form a flange support platform (3). The lower mold (1) has multiple punches connected to the cavity (2) on its outer side. The lower mold (1) has a punching mechanism. After bending, the punching mechanism punches the vertical bending of the door panel. The upper mold (9) has a punching head (18) at its bottom. The punching head (18) has multiple clearance holes opposite to the punching holes. The upper mold (9) has a cutting mechanism on both sides. In the mold closing state, the cutting mechanism cuts off the excess sheet material along the flange support platform (3).

2. The steel fire door processing device according to claim 1, characterized in that, The cavity (2) has multiple vertical holes at the bottom. The bottom of the lower mold (1) has an embedded plate (17) with multiple springs on it. Each spring has a top ejector rod (6) at the top, and the ejector rod (6) passes through the vertical holes.

3. The steel fire door processing device according to claim 1, characterized in that, The punching mechanism includes a connecting plate a (13) that is slidably disposed on the outer wall of the lower die (1) along the punching direction, a punching part (12) disposed on the connecting plate a (13) and inserted into the punching hole, a mounting seat (15) disposed on the outer wall of the lower die (1), and a telescopic device a (16) disposed on the mounting seat (15) and pushing the connecting plate a (13) to move.

4. The steel fire door processing device according to claim 1, characterized in that, The trimming mechanism includes a telescopic device b (28) disposed vertically at the bottom of the upper mold mounting plate (7), and a trimming plate (29) disposed at the telescopic end of the telescopic device b (28).

5. The steel fire door processing device according to claim 1, characterized in that, During the bending process, the punches on the vertical surface of the cavity (2) are completely filled by the punching mechanism, ensuring the complete vertical bending surface of the cavity (2). During the bending process, the clearance holes on the upper die (9) are also filled.

6. The steel fire door processing device according to claim 5, characterized in that, An installation groove is opened on the top surface of the upper die (9), and a filling part (19) is slidably set in the installation groove. The filling part (19) is inserted into the clearance hole opened on the upper die (9) to form a complete bending working surface in the bending state.

7. The steel fire door processing device according to claim 6, characterized in that, Slide plate (25) is vertically slidable in the mounting groove. Lifting device (26) is vertically installed at the bottom of the upper mold mounting plate (7). The bottom extension end of the lifting device (26) is connected to slide plate (25). Fixed seat is installed on the inner wall of the bottom of the mounting groove. Bend (21) is installed on the fixed seat. Piston rod a (20) and piston rod b (22) are respectively installed in the horizontal and vertical sections of the bend (21). Connecting plate b (24) is slidably installed in the mounting groove. All filling parts (19) are connected to connecting plate b (24). Connecting plate b (24) is connected to piston rod a (20). The top of piston rod b (22) is connected to the bottom of slide plate (25). Hydraulic oil is contained in bend (21) and between piston rod a (20) and piston rod b (22).

8. A method for processing steel fire doors, using the steel fire door processing apparatus as described in claim 7, characterized in that, Includes the following steps: S1. Place the cut door panel blank into the feeding groove (5) of the lower mold (1); S2. Start the hydraulic system to drive the upper mold (9) to move downward, and at the same time control the lifting device (26) to extend, push the slide plate (25) to descend, and push all the filling parts (19) to move outward, so that the filling parts (19) are inserted into the clearance holes on the upper mold (9) to form a complete bending working surface; the upper mold (9) continues to press down to the mold closing state, at which time the punch head (18) cooperates with the cavity (2) to complete the bending of both sides of the door panel; S3. In the mold closed state, the edge is trimmed and the trimmed waste falls into the trimming waste groove (4); S4. Keep the upper mold (9) in the closed state, control the lifting device (26) to retract and pull the filling part (19) inward, so that the clearance hole on the punch head (18) opens; then the punching mechanism moves to complete the punching operation of the hinge hole and lock hole on the vertical bend of the door panel, and the waste generated by punching is pushed into the clearance hole of the punch head (18); S5. After punching is completed, the punching mechanism is reset, and then the hydraulic system is controlled to drive the upper die (9) to move upward and reset. At the same time, the lifting device (26) is controlled to extend again, pushing the filling part (19) to move outward, pushing out the punching waste that is stuck in the clearance hole and falling onto the workpiece. S6. After the upper mold (9) is fully reset, the operator removes the workpiece with punching waste as a whole, and then removes the waste in the trimming and blanking groove (4) to complete the single-piece processing.

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