A fine blanking apparatus and a fine blanking method

Abstract

This application provides a fine blanking equipment and a fine blanking method. Firstly, the fine blanking equipment and method provided by this application, through the coordinated operation of a hydraulic system, die components, and a conventional punch press, can achieve precise control of the upper and lower dies and the stamping process. This ensures that the workpiece receives uniform and stable pressure during stamping, resulting in a flat stamped surface and accurate dimensions, achieving the effect of fine blanking. Thus, fine blanking can be performed using a conventional punch press in conjunction with a hydraulic system, eliminating the need for dedicated fine blanking equipment and reducing costs. Secondly, the multi-station stamping design, where the first stamping station performs preliminary forming of the workpiece, followed by more refined secondary processing at the second station, not only effectively reduces deformation, tearing, or other problems during the stamping process, resulting in a final workpiece with higher precision and flatness, but also achieves continuous fine blanking, thereby improving production efficiency.

Description

Technical Field

[0001] This application relates to the field of stamping technology, and more particularly to a fine blanking equipment and a fine blanking method. Background Technology

[0002] The stamping process applies pressure to a workpiece using a punch press and a die, causing the workpiece to deform and thus obtain a workpiece of the desired shape and size.

[0003] Traditional punch presses can only provide force in a single direction, limiting their application in complex operations. They cannot provide forces in multiple directions to ensure precise workpiece forming. Furthermore, because the force of a traditional punch press is unidirectional, it may cause workpiece displacement or deformation during the stamping process, ultimately affecting the accuracy of the finished product. In contrast, fine blanking presses offer advantages in terms of high precision and high quality compared to ordinary punch presses. However, the manufacturing cost of fine blanking presses is significantly higher than that of ordinary punch presses due to the special mold design and manufacturing processes required for fine blanking. Therefore, how to achieve fine blanking using ordinary punch presses has become a current research hotspot. Summary of the Invention

[0004] In view of this, this application provides a fine blanking equipment and a fine blanking method for using a conventional punch press to achieve a fine blanking process, thereby improving the surface flatness of the workpiece.

[0005] Specifically, this application is implemented through the following technical solution:

[0006] The first aspect of this application provides a fine stamping device.

[0007] The fine blanking equipment includes a hydraulic system, a die assembly, a conventional punch press, and a control system; wherein,

[0008] The hydraulic system is equipped with a first cylinder group, a second cylinder group, a third cylinder group, and a fourth cylinder group;

[0009] The mold assembly includes an upper mold and a lower mold arranged opposite to each other; a space is formed between the upper mold and the lower mold for accommodating the workpiece to be stamped;

[0010] The upper mold includes an upper fixed plate, a pressure plate, a first punch, and a second punch; the upper table of the ordinary punch press is fixedly connected to the upper fixed plate; the piston of the cylinder of the first cylinder group passes through the upper fixed plate and is fixed on the pressure plate; the feeding side of the pressure plate has a first groove; the first punch is fixed on the upper fixed plate and extends into the first groove to form a first stamping station;

[0011] The discharge side of the pressure plate has a second groove; an inner pressure plate is provided in the second groove, and the piston of the cylinder of the second cylinder group passes through the fixed plate and is fixedly connected to the inner pressure plate; the inner pressure plate has a third groove, and the second punch is fixed on the upper fixed plate and extends into the third groove to form a second stamping station;

[0012] The lower die includes a lower fixed plate and a concave die; wherein, the lower table of the ordinary punch press is fixedly connected to the lower fixed plate; a first lower groove is provided on the concave die at a position directly opposite to the first punch, and a first top block is provided in the first lower groove; the piston of the cylinder of the third cylinder group passes through the lower fixed plate and is fixed on the first top block; a second lower groove is provided on the concave die at a position directly opposite to the second punch, and a second top block is provided in the second lower groove; the piston of the cylinder of the fourth cylinder group passes through the lower fixed plate and is fixed on the second top block.

[0013] The control system is used to control the ordinary punch press, the first cylinder group, the second cylinder group, the third cylinder group and the fourth cylinder group, so that the workpiece to be punched can be continuously finely punched by sequentially passing through the first punching station and the second punching station through the coordinated cooperation of the ordinary punch press, the first cylinder group, the second cylinder group, the third cylinder group and the fourth cylinder group.

[0014] A second aspect of this application provides a fine blanking method, the method being implemented based on the fine blanking equipment provided in the first aspect of this application; the fine blanking method includes:

[0015] The workpiece to be stamped is placed in the first stamping station, and the workpiece to be stamped is stamped to obtain an initial stamped part; wherein, the initial stamped part has a first stamping groove;

[0016] The initial stamped part is placed in the second stamping station and stamped again to obtain the final stamped part; wherein, when the initial stamped part is stamped, the second punch is located in the first stamping groove to stamp and protect the first stamping groove; the inner pressure plate stamps the initial stamped part to form a second stamping groove in the circumferential direction of the first stamping groove.

[0017] The fine blanking equipment provided in this application, firstly, through the coordinated operation of a hydraulic system, die components, and a conventional punch press, achieves precise control over the upper and lower dies and the stamping process. This ensures that the workpiece receives uniform and stable pressure during stamping, resulting in a flat stamped surface and accurate dimensions, thus achieving the effect of fine blanking. In this way, fine blanking can be performed using a conventional punch press in conjunction with a hydraulic system, eliminating the need to purchase dedicated fine blanking equipment and reducing costs. Secondly, the multi-station stamping design, with the first stamping station performing preliminary shaping of the workpiece and subsequent more refined secondary processing at the second station, not only effectively reduces deformation, tearing, or warping during the stamping process, resulting in a final workpiece with higher precision and flatness, and improved surface smoothness, but also enables continuous fine blanking, thereby increasing production efficiency.

[0018] The fine blanking method provided in this application, through step-by-step stamping, firstly stamps to form the first stamping groove, and then further stamps at the second station using an inner pressure plate, making the final workpiece more precise in shape and size, suitable for manufacturing high-precision parts. By stamping in steps, pressure is distributed across different stations and steps, making the stress on the workpiece more uniform in each step, avoiding excessive material deformation during a single stamping process, and improving the flatness and structural stability of the finished product. Furthermore, during the second stamping process, the second punch is located within the first stamping groove, providing support and protection, preventing deformation or damage to the first stamping groove, further improving the quality and consistency of the stamped workpiece and enhancing surface flatness. Attached Figure Description

[0019] Figure 1 A schematic diagram of Embodiment 1 of the fine blanking equipment provided in this application;

[0020] Figure 2 A schematic diagram of a hydraulic system shown in an exemplary embodiment of this application;

[0021] Figure 3 A schematic diagram illustrating the implementation principle of the initial stage of an exemplary embodiment of this application;

[0022] Figure 4 This is a schematic diagram illustrating the implementation principle of the pressing stage in an exemplary embodiment of this application;

[0023] Figure 5 This is a schematic diagram illustrating the implementation principle of the stamping stage in an exemplary embodiment of this application;

[0024] Figure 6 This is a schematic diagram illustrating the implementation principle of the demolding stage, as shown in an exemplary embodiment of this application.

[0025] Figure 7This is a schematic diagram illustrating the implementation principle of the mold-opening stage, as shown in an exemplary embodiment of this application.

[0026] Figure 8 This is a schematic diagram illustrating the implementation principle of the ejection stage in an exemplary embodiment of this application;

[0027] Figure 9 This is a flowchart of an embodiment of the fine blanking method provided in this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1: Hydraulic system;

[0030] 2: Mold components;

[0031] 111: First hydraulic cylinder group;

[0032] 112: Second hydraulic cylinder group;

[0033] 113: Third hydraulic cylinder group;

[0034] 114: Fourth hydraulic cylinder group;

[0035] 12: Fuel tank;

[0036] 13: Oil pump;

[0037] 14: Main oil circuit;

[0038] 15: Sub-oil circuits corresponding to each cylinder group;

[0039] H1: First directional control valve;

[0040] H2: Second directional valve;

[0041] H3: Third directional valve;

[0042] Y1: First relief valve;

[0043] Y2: Second relief valve;

[0044] S: Mechanical pressure gauge;

[0045] K: Digital pressure switch;

[0046] M: Air cooler;

[0047] 121: Oil filter;

[0048] 122: Air filter;

[0049] 1231: Electrical signal level gauge;

[0050] 1232: Mechanical level gauge;

[0051] 21: Place the mold;

[0052] 22: Lower mold;

[0053] 211: Upper fixing plate;

[0054] 212: Pressure plate;

[0055] 213: First punch;

[0056] 214: Second punch

[0057] 215: Internal pressure plate;

[0058] 221: Lower fixing plate;

[0059] 222: Concave template;

[0060] 223: First top block;

[0061] 224: Second top block. Detailed Implementation

[0062] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application.

[0063] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used herein are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0064] It should be understood that although the terms first, second, third, etc., may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0065] The following specific embodiments are given to illustrate the technical solution of this application in detail.

[0066] Figure 1 This is a schematic diagram of Embodiment 1 of the fine blanking equipment provided in this application. Please refer to... Figure 1The fine stamping equipment provided in this embodiment includes a hydraulic system 1, a die assembly 2, a conventional punch press (not shown in the figure), and a control system (not shown in the figure); wherein,

[0067] The hydraulic system 1 is provided with a first cylinder group 111, a second cylinder group 112, a third cylinder group 113 and a fourth cylinder group 114;

[0068] The mold assembly 2 includes an upper mold 21 and a lower mold 22 arranged opposite to each other; a space for accommodating the workpiece to be stamped is formed between the upper mold 21 and the lower mold 22;

[0069] The upper mold 21 includes an upper fixed plate 211, a pressure plate 212, a first punch 213, and a second punch 214; the upper table of the ordinary punch press (not shown in the figure) is fixedly connected to the upper fixed plate 211; the piston of the cylinder of the first cylinder group 111 passes through the upper fixed plate 211 and is fixed on the pressure plate 212; the feeding side of the pressure plate 212 has a first groove; the first punch 213 is fixed on the upper fixed plate 211 and extends into the first groove to form a first stamping station;

[0070] The discharge side of the pressure plate 212 has a second groove; an inner pressure plate 215 is provided in the second groove, and the piston of the cylinder of the second cylinder assembly 112 passes through the upper fixed plate 211 and is fixedly connected to the inner pressure plate 215; the inner pressure plate 215 has a third groove, and the second punch 214 is fixed on the upper fixed plate 211 and extends into the third groove to form a second stamping station;

[0071] The lower mold 22 includes a lower fixed plate 221 and a concave mold 222; wherein, the lower table of the ordinary punch press (not shown in the figure) is fixedly connected to the lower fixed plate 221; a first lower groove is provided on the concave mold 222 at a position directly opposite to the first punch 213, and a first top block 223 is provided in the first lower groove; the piston of the cylinder of the third cylinder group 113 passes through the lower fixed plate 221 and is fixed on the first top block 223; a second lower groove is provided on the concave mold 222 at a position directly opposite to the second punch 214, and a second top block 224 is provided in the second lower groove; the piston of the cylinder of the fourth cylinder group 114 passes through the lower fixed plate 221 and is fixed on the second top block 224;

[0072] The control system is used to control the ordinary punch press, the first hydraulic cylinder group 111, the second hydraulic cylinder group 112, the third hydraulic cylinder group 113, and the fourth hydraulic cylinder group 114, so that the workpiece to be punched can be continuously finely punched by sequentially passing through the first punching station and the second punching station through the coordinated operation of the ordinary punch press, the first hydraulic cylinder group 111, the second hydraulic cylinder group 112, the third hydraulic cylinder group 113, and the fourth hydraulic cylinder group 114.

[0073] Specifically, the hydraulic system 1 is equipped with four sets of cylinder groups. For ease of distinction, these four sets of cylinder groups are respectively designated as the first cylinder group 111, the second cylinder group 112, the third cylinder group 113, and the fourth cylinder group 114. Furthermore, the number of cylinders in each cylinder group is set according to actual needs; in this embodiment, it is not limited. In addition, the number of cylinders in each cylinder group can be the same or different; in this embodiment, it is not limited. For example, please refer to... Figure 1 ,exist Figure 1 In the example shown, the second cylinder group 112, the third cylinder group 113, and the fourth cylinder group 114 each contain one cylinder, and the first cylinder group 111 contains three cylinders.

[0074] Optional, Figure 2 This is a schematic diagram of a hydraulic system shown in an exemplary embodiment of this application. Please refer to... Figure 2 The hydraulic system also includes an oil tank 12, an oil pump 13, a main oil circuit 14, and sub-oil circuits 15 corresponding to each cylinder group;

[0075] The oil outlet of the oil tank 12 is connected to the oil inlet of the main oil circuit 14 and the oil inlet of the sub-oil circuit 15 of each cylinder group through the oil pump 13; wherein, the oil supply end of the sub-oil circuit 15 of each cylinder group is connected to the cylinder group and is used to supply oil to the cylinder group.

[0076] The return end of the main oil circuit 14 and the return end of the sub-oil circuit 15 corresponding to each cylinder group are connected to the return end of the oil tank 12.

[0077] For details, please continue to refer to... Figure 2 Each cylinder group has a corresponding sub-oil circuit 15, which is a sub-oil circuit controlled by a solenoid valve group. The solenoid valve group controls the inlet and outlet of hydraulic oil.

[0078] For example, in Figure 2 In the example shown, each sub-oil circuit 15 includes a first directional valve H1, a second directional valve H2, and a first relief valve Y1; wherein,

[0079] The oil inlet end of the first reversing valve H1 constitutes the oil inlet end of the sub-oil circuit, and the oil outlet end of the first reversing valve H1 constitutes the oil supply end of the sub-oil circuit 15.

[0080] The oil inlet of the second directional valve H2 is connected to the oil outlet of the first directional valve H1 via an oil pipe; the oil outlet of the second directional valve H2 constitutes the return oil end of the sub-oil circuit 15.

[0081] The first overflow valve Y1 is connected between the oil outlet of the first reversing valve H1 and the oil outlet of the second reversing valve H2.

[0082] For further details, please refer to [link / reference]. Figure 2 The main oil circuit 14 includes a third directional valve H3 and a second relief valve Y2; wherein,

[0083] The oil inlet end of the third directional valve H3 constitutes the oil inlet end of the main oil circuit 14, and the oil outlet end of the third directional valve H3 constitutes the oil outlet end of the main oil circuit 14.

[0084] The second overflow valve Y2 is connected between the inlet and outlet ends of the third directional valve H3 via an oil pipe.

[0085] Furthermore, mechanical pressure gauges S and digital pressure switches K are installed on the main oil circuit 14 and the sub-oil circuit 15. Additionally, an air cooler M is installed on the return oil flow path corresponding to the return oil end of the oil tank 12.

[0086] Optionally, the oil tank 12 is equipped with an oil filter 121, an air filter 122, and a level gauge. Figure 2 The electrical signal level gauge 1231 and the mechanical level gauge 1232 are shown.

[0087] Specifically, the air filter 122 serves as the filler port for the fuel tank 12. When refueling, the air filter 122 prevents dust, sand, and other fine particles from entering the fuel tank 12, thus ensuring the purity of the fuel. Furthermore, the fuel in the fuel tank 12 is pumped by the fuel pump 13 to the inlet of the main fuel line 14 and the inlet of the sub-fuel lines 15 corresponding to each cylinder group, supplying fuel to each cylinder group.

[0088] The following description uses the sub-oil circuit 15 corresponding to the first cylinder group 111 as an example to illustrate the process of the oil tank 12 supplying oil to the cylinder group through the oil pump 13.

[0089] Specifically, after the oil pump 13 delivers oil to the inlet of the sub-oil circuit 15, the oil first enters the inlet of the first directional valve H1, flows out of the first directional valve H1, and then enters the oil cylinder to supply oil to the cylinder. In addition, the inlet of the second directional valve H2 is connected to the outlet of the first directional valve H1, and the outlet of the second directional valve H2 constitutes the return end of the sub-oil circuit. The first relief valve Y1 is connected between the outlet of the first directional valve H1 and the outlet of the second directional valve H2. When the oil pressure in the sub-oil circuit is too high, the excess oil will flow back through the first relief valve Y1.

[0090] Furthermore, in the main oil circuit 14, the oil first enters the inlet end of the third directional valve H3 and then flows out from the outlet end of the third directional valve H3. When the oil pressure in the main oil circuit is too high, the excess oil will flow back from the second overflow valve Y2 connected between the inlet and outlet ends of the third directional valve H3.

[0091] Furthermore, a mechanical pressure gauge S and a digital pressure switch K are respectively installed on the main oil circuit 14 and the sub-oil circuit 15 to monitor the oil pressure of the main oil circuit 14 and the sub-oil circuit 15. When the main oil circuit 14 and the oil cylinder need to return oil (equivalent to draining oil from the oil cylinder, so that the oil in the oil cylinder and all oil circuits flows back to the oil tank), the oil flows back from the return end of the main oil circuit 14 and the return end of the sub-oil circuit 15 to the return end of the oil tank 12. On the return flow path corresponding to the return end of the oil tank 12, an air cooler M is installed to cool the returning oil.

[0092] Furthermore, the oil filter 121 in the oil tank 12 is located at the oil outlet end of the oil tank 12 to filter impurities in the oil and ensure that the oil flowing into the oil circuit is clean. The oil tank 12 is also equipped with an electrical signal level gauge 1231 and a mechanical level gauge 1232. The electrical signal level gauge 1231 is used to monitor the oil level in the oil tank and provide feedback to the control system, while the mechanical level gauge 1232 is used by the operator to directly monitor the oil level in the oil tank.

[0093] It should be noted that in this application, each directional valve is a two-position, two-way directional valve, which controls the flow of hydraulic oil through electrical signals from the control system to control the extension or retraction of the hydraulic cylinder. In addition, each relief valve is used to maintain the pressure of each oil circuit and protect the system under high-pressure conditions.

[0094] Specifically, the mold system 2 includes an upper mold 21 and a lower mold 22 arranged opposite to each other. Further, in order from top to bottom, the upper mold 21 includes an upper fixing plate 211, a pressure plate 212, a first punch 213 and a second punch 214; in order from bottom to top, the lower mold 22 includes a lower fixing plate 221 and a concave template 222; wherein, a space for accommodating the workpiece to be stamped is formed between the pressure plate 212 and the concave template 222, and the workpiece will be placed in this space for processing.

[0095] Furthermore, the pressure plate 212 is connected to the piston of the first hydraulic cylinder assembly 111, which drives the pressure plate. The pressure plate 212 has a first groove and a second groove. The first groove is located on the feed side of the pressure plate 212 and is used to accommodate the first punch 213, forming a first stamping station. The second groove is located on the discharge side of the pressure plate 212 and houses an inner pressure plate 215, which is connected to the piston of the second hydraulic cylinder assembly 112.

[0096] In addition, a third groove is provided in the inner pressure plate 215 to accommodate the second punch 214, forming a second stamping station.

[0097] Furthermore, the concave template 222 is mounted on the lower fixed plate 221 and cooperates with the punch on the upper mold 21. Specifically, the concave template 222 is provided with a first lower groove and a second lower groove; wherein, the first lower groove is located directly opposite to the first punch 213 on the upper mold 21, and there is a first ejector block 223 in the first lower groove. The first ejector block 223 is fixed by the piston of the cylinder of the third cylinder group 113 and is responsible for ejecting the stamped workpiece; the second lower groove is located directly opposite to the second punch 214 on the upper mold 21, and there is a second ejector block 224 in the second groove. The second ejector block 224 is fixed by the piston of the cylinder of the fourth cylinder group 114 and is responsible for ejecting the stamped workpiece.

[0098] Optional, please continue to refer to Figure 1 In one possible implementation, the height of the inner pressure plate 215 along the stamping direction is greater than the height of the pressure plate 212 along the stamping direction.

[0099] It should be noted that the widths of the first punch 213 and the second punch 214 along the feeding direction are the same. The height of the first punch 213 along the stamping direction is greater than the height of the pressure plate 212 along the stamping direction. The difference between the two is the stamping depth that the first stamping station can stamp (the depth of the first stamping groove formed by stamping). In addition, the height of the first punch 213 along the stamping direction is less than the height of the second punch along the stamping direction. The difference between the two is equal to the difference between the height of the pressure plate 212 along the stamping direction and the height of the first punch 213 along the stamping direction. In this way, after the second punch 214 penetrates into the first stamping groove, it does not apply force to it, but rather protects it, which can improve the surface flatness of the stamping.

[0100] For further details, please refer to [link / reference]. Figure 1The width of the inner pressure plate 215 along the feeding direction is greater than the width of the second punch 214 along the feeding direction, and the second punch 214 is located in the middle of the inner pressure plate 215 (the width of the inner pressure plate 215 is the width that the second stamping station can stamp). In addition, the height of the inner pressure plate 215 along the stamping direction is greater than the height of the lower pressure plate 32 along the stamping direction, and the difference between the two is the depth that the second stamping station can stamp (the depth of the second stamping groove formed by stamping).

[0101] For details, please continue to refer to... Figure 1 It can be understood that the upper mold 21 and the lower mold 22 are similar to rectangular plates with a gap between them for placing the workpiece to be stamped. During the stamping process, the upper mold 21 and the lower mold 22 are in close contact with the workpiece to be stamped, and pressure is applied to the workpiece by the punch to perform the stamping.

[0102] Specifically, the control system can be a controller used to control the hydraulic system 1 and the ordinary punch press to work together to perform stamping.

[0103] Specifically, the control system is used to control the first cylinder group 111, the second cylinder group 112, the third cylinder group 113 and the fourth cylinder group 114 to enter a stable pressure state in the initial stage.

[0104] The control system is also specifically used to control the upper table of the ordinary punch press to move downward during the pressing stage and the stamping stage, so that the upper die 21 moves downward as a whole, so that the upper die 21 contacts the workpiece to be stamped, thereby causing the first punch 213 and the inner pressure plate 215 to perform a stamping operation on the workpiece to be stamped.

[0105] The control system is also specifically used to control the first hydraulic cylinder group 111 and the second hydraulic cylinder group 112 to enter the pressurization state and the third hydraulic cylinder group 113 and the fourth hydraulic cylinder group 114 to enter the depressurization state during the demolding stage, so that the cylinders of the first hydraulic cylinder group 111 and the second hydraulic cylinder group 112 return to their initial positions, and the third hydraulic cylinder group 113 and the fourth hydraulic cylinder group 114 maintain their positions.

[0106] The control system is also specifically used to control the upper table of the ordinary punch press to move upward as a whole during the mold opening stage, so that the upper mold 21 moves upward as a whole and returns to the position corresponding to the initial stage.

[0107] The control system is also specifically used to control the third hydraulic cylinder group 113 and the fourth hydraulic cylinder group 114 to enter the pressurization stage during the ejection stage, so as to eject the workpiece to be stamped.

[0108] It should be noted that the cylinders in each cylinder group have the same structure. The following example, taking the first cylinder group 111 as an example, illustrates the working state of the cylinder group.

[0109] Specifically, the working states of a hydraulic cylinder can be divided into the following states: stationary state, pressurized state, stable pressure state, and depressurized state. The stationary state refers to the cylinder being in an unpressurized state, typically during the initial or final working phases. The pressurized state occurs when oil enters the cylinder, and the pressure inside gradually increases. The stable pressure state occurs when the pressure inside the cylinder has reached the required level and stabilized; in this state, the cylinder no longer moves but maintains pressure, and the piston position is fixed to maintain pressure on the workpiece. In the depressurized state, the pressure inside the cylinder is released, the piston returns to its initial position, and the cylinder stops working and returns to a stationary state.

[0110] Specifically, each stamping process for a workpiece mainly includes five stages: blanking, stamping, demolding, mold opening, and ejection. The fine blanking equipment provided in this embodiment involves two stamping processes. The purpose of the first stamping process is to use the first punch 213 to stamp the initial stamped part, forming a first stamping groove. The purpose of the second stamping process is to use the inner blanking plate 215 to stamp the initial stamped part again to obtain the final stamped part. During the second stamping process, the second punch 214 is positioned within the first stamping groove to protect it; the inner blanking plate 215 stamps the initial stamped part to form a second stamping groove circumferentially within the first stamping groove. Of course, during the second stamping process, the first punch 213 can simultaneously stamp the initial stamped part.

[0111] It should be noted that the steps of the first stamping process and the second stamping process are the same. The following description will take the second stamping process as an example to illustrate the five stages of the stamping process.

[0112] Specifically, Figure 3 This is a schematic diagram illustrating the implementation principle of the initial stage of an exemplary embodiment of this application. It should be noted that before stamping begins, the workpiece to be stamped is placed in the space used to accommodate it. At this time, the cylinders in each cylinder group are without pressure and do not perform any work. Further details can be found by referring to... Figure 3In the initial stage, the first directional valve H1 on the sub-oil circuit is opened, allowing oil to enter the cylinder. As oil gradually enters the cylinder, the pressure inside the cylinder gradually increases. When the pressure inside the cylinder reaches the specified stable working pressure, the first directional valve H1 on the corresponding sub-oil circuit is closed. At this point, the pressure inside the cylinder remains unchanged, indicating that the cylinder is in a stable pressure state. Thus, the control system controls the first cylinder group 111, the second cylinder group 112, the third cylinder group 113, and the fourth cylinder group 114 to enter the stable pressure state by controlling the opening and closing of the first directional valve H1 and the second directional valve H2 in the oil circuit.

[0113] Furthermore, Figure 4 This is a schematic diagram illustrating the implementation principle of the material pressing stage in an exemplary embodiment of this application. Figure 5 This is a schematic diagram illustrating the implementation principle of the stamping stage in an exemplary embodiment of this application. Please refer to... Figure 4 During the pressing stage, the initial stamping workpiece with the first stamping groove is placed on the second stamping station. The control system 4 controls the upper table of the ordinary punch press 3 to move downward, thereby driving the upper fixed plate 211, which is fixedly connected to the upper table, to move downward, and finally driving the second punch 214 to move downward. During the downward movement of the second punch 214, the upper mold 21 moves downward as a whole until the pressing plate 212 contacts the initial stamping workpiece, and the second punch 214 contacts the first stamping groove on the initial stamping workpiece.

[0114] For further details, please refer to Figure 5 Entering the stamping stage, the upper platform continues to move downwards. During the downward movement of the upper platform, the upper mold 21 will move further downwards. The upper mold 21 will continue to drive the first hydraulic cylinder group 111 and the second hydraulic cylinder group 112 to move downwards as a whole, controlling the first punch 213 and the inner pressure plate 215 to apply pressure to the initial stamping part for stamping. At this time, the first punch 213 is exposed in the first groove, the inner pressure plate 215 is exposed from the second groove, and the second punch 214 is inserted into the first stamping groove. The first punch 213 and the inner pressure plate 215 are on the workpiece to be stamped, that is, the first punch 213 stamps the workpiece to be stamped to form the first stamping groove, and the inner pressure plate 215 stamps the first stamping groove axially again to form the second stamping groove structure axially. It should be noted that when the inner pressure plate 215 performs a second stamping on the circumference of the first stamping groove, the second punch 214 applies force to the first stamping groove, thus protecting the first stamping groove.

[0115] It should be noted that the stamping force and speed are determined by the material and requirements of the initial stamped part, as well as the performance of the equipment, and are controlled by the control system.

[0116] Specifically, Figure 6This is a schematic diagram illustrating the implementation principle of the demolding stage in an exemplary embodiment of this application. Please refer to... Figure 6 During the demolding stage, the control system controls the first cylinder group 111 and the second cylinder group 112 to enter the pressurization state, and the third cylinder group 113 and the fourth cylinder group 114 to enter the depressurization state, so that the cylinders of the first cylinder group 111 and the second cylinder group 112 return to their initial positions, and the third cylinder group 113 and the fourth cylinder group 114 maintain their positions.

[0117] Specifically, as described above, the hydraulic cylinder entering the pressurized state refers to adding oil to the cylinder to increase the pressure inside, thus allowing the cylinder to return to its initial position. The rising of the hydraulic cylinders in the first hydraulic cylinder group 111 and the second hydraulic cylinder group 112 drives the pressure plate 212 and the inner pressure plate 215 to rise, causing the initial stamped part to separate from the upper die 21.

[0118] Specifically, Figure 7 This is a schematic diagram illustrating the implementation principle of the mold-opening stage, as shown in an exemplary embodiment of this application. Please refer to... Figure 7 During the mold opening stage, the control system controls the upper table of the ordinary punch press to move upward as a whole, which in turn drives the first punch 213 and the second punch 214 to move upward. During the upward movement of the punches, the upper mold 21 will move upward, which in turn drives the first hydraulic cylinder group 111 and the second hydraulic cylinder group 112 to move upward as a whole, so that the entire fine stamping equipment returns to the position corresponding to the initial stage.

[0119] Specifically, Figure 8 This is a schematic diagram illustrating the implementation principle of the ejection stage in an exemplary embodiment of this application. The control system controls the opening of the oil circuit valves of the sub-oil circuits corresponding to the third oil cylinder group 113 and the fourth oil cylinder group 114, allowing oil to enter the third oil cylinder group 113 and the fourth oil cylinder group 114 to pressurize them. During the pressurization stage, the third oil cylinder group 113 drives the first ejector block 223 to move upward, while the fourth oil cylinder group 114 drives the second ejector block 224 to move upward, thereby ejecting the final stamped part so that the operator can remove the final stamped part from the mold assembly 2.

[0120] The fine blanking equipment provided in this embodiment, firstly, through the coordinated operation of the hydraulic system, die assembly, and ordinary punch press, can achieve precise control of the upper and lower dies and the stamping process. This ensures that the workpiece is subjected to uniform and stable pressure during the stamping process, resulting in a flat stamped surface and accurate dimensions, thus achieving the effect of fine blanking. In this way, fine blanking can be performed using an ordinary punch press in conjunction with the hydraulic system, eliminating the need to purchase dedicated fine blanking equipment and reducing costs. Secondly, the multi-station stamping design, with the first stamping station performing preliminary forming of the workpiece and the subsequent second station performing more refined secondary processing, not only effectively reduces problems such as deformation, tearing, or warping during the stamping process, resulting in a final workpiece with higher precision and flatness, but also enables continuous fine blanking, thereby improving production efficiency.

[0121] Corresponding to the aforementioned embodiment of a fine blanking device, this application also provides an embodiment of a fine blanking method.

[0122] Figure 9 This is a schematic diagram of the structure of an embodiment of the fine blanking method provided in this application. Please refer to... Figure 9 The method provided in this embodiment is implemented based on the fine blanking equipment provided in this application, and the fine blanking method includes:

[0123] S101. Place the workpiece to be stamped in the first stamping station and stamp the workpiece to be stamped to obtain an initial stamped part; wherein the initial stamped part has a first stamping groove.

[0124] S102. The initial stamped part is placed in the second stamping station, and the initial stamped part is stamped again to obtain the final stamped part; wherein, when the initial stamped part is stamped, the second punch is located in the first stamping groove to stamp and protect the first stamping groove; the inner pressure plate stamps the initial stamped part to form a second stamping groove in the circumferential direction of the first stamping groove.

[0125] The method in this embodiment can be used to execute Figure 1 The steps of the device embodiment shown are similar in principle and process, and will not be repeated here.

[0126] The fine blanking method provided in this embodiment, through step-by-step stamping, after the initial stamping forms the first stamping groove, further stamping is performed at the second station using an inner pressure plate, resulting in a more precise shape and size of the final workpiece, suitable for manufacturing high-precision parts. By stamping in steps, pressure is distributed across different stations and steps, making the stress on the workpiece more uniform in each step, avoiding excessive material deformation during a single stamping process, and improving the flatness and structural stability of the finished product. Furthermore, during the second stamping process, the second punch is located within the first stamping groove, providing support and protection, preventing deformation or damage to the first stamping groove, and further improving the quality and consistency of the stamped workpiece.

[0127] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A fine stamping device, characterized in that, The fine blanking equipment includes a hydraulic system, a die assembly, a conventional punch press, and a control system; wherein, The hydraulic system is equipped with a first cylinder group, a second cylinder group, a third cylinder group, and a fourth cylinder group; The mold assembly includes an upper mold and a lower mold arranged opposite to each other; a space is formed between the upper mold and the lower mold for accommodating the workpiece to be stamped; The upper mold includes an upper fixed plate, a pressure plate, a first punch, and a second punch; the upper table of the ordinary punch press is fixedly connected to the upper fixed plate; the piston of the cylinder of the first cylinder group passes through the upper fixed plate and is fixed on the pressure plate; the feeding side of the pressure plate has a first groove; the first punch is fixed on the upper fixed plate and extends into the first groove to form a first stamping station; The discharge side of the pressure plate has a second groove; an inner pressure plate is provided in the second groove, and the piston of the cylinder of the second cylinder group passes through the fixed plate and is fixedly connected to the inner pressure plate; the inner pressure plate has a third groove, and the second punch is fixed on the upper fixed plate and extends into the third groove to form a second stamping station; The lower die includes a lower fixed plate and a concave die; wherein, the lower table of the ordinary punch press is fixedly connected to the lower fixed plate; a first lower groove is provided on the concave die at a position directly opposite to the first punch, and a first top block is provided in the first lower groove; the piston of the cylinder of the third cylinder group passes through the lower fixed plate and is fixed on the first top block; a second lower groove is provided on the concave die at a position directly opposite to the second punch, and a second top block is provided in the second lower groove; the piston of the cylinder of the fourth cylinder group passes through the lower fixed plate and is fixed on the second top block. The control system is used to control the ordinary punch press, the first cylinder group, the second cylinder group, the third cylinder group and the fourth cylinder group, so that the workpiece to be punched can be continuously finely punched by sequentially passing through the first punching station and the second punching station through the coordinated cooperation of the ordinary punch press, the first cylinder group, the second cylinder group, the third cylinder group and the fourth cylinder group.

2. The fine stamping equipment according to claim 1, characterized in that, The control system is specifically used to control the first cylinder group, the second cylinder group, the third cylinder group and the fourth cylinder group to enter a stable pressure state in the initial stage; The control system is also specifically used to control the upper table of the ordinary punch press to move downward during the pressing stage and the stamping stage, so that the upper die moves downward as a whole, so that the upper die contacts the workpiece to be stamped, thereby causing the first punch and the inner pressure plate to perform a stamping operation on the workpiece to be stamped. The control system is also specifically used to control the first and second cylinder groups to enter a pressurized state and the third and fourth cylinder groups to enter a depressurized state during the demolding stage, so that the cylinders of the first and second cylinder groups return to their initial positions and the third and fourth cylinder groups maintain their positions. The control system is also specifically used to control the upper table of the ordinary punch press to move upward during the mold opening stage, so that the upper mold as a whole moves upward and returns to the position corresponding to the initial stage; The control system is also specifically used to control the third and fourth hydraulic cylinder groups to enter the pressurization stage during the ejection stage, so as to eject the workpiece to be stamped.

3. The fine stamping equipment according to claim 1, characterized in that, The height of the inner pressure plate along the stamping direction is greater than the height of the pressure plate along the stamping direction.

4. The fine blanking equipment according to claim 1, characterized in that, The hydraulic system also includes an oil tank, an oil pump, a main oil circuit, and sub-oil circuits corresponding to each cylinder group; The oil outlet of the oil tank is connected to the oil inlet of the main oil circuit and the oil inlet of the sub-oil circuit of each cylinder group through the oil pump; wherein, the oil supply end of the sub-oil circuit of each cylinder group is connected to the cylinder group and is used to supply oil to the cylinder group. The return end of the main oil circuit and the return end of the sub-oil circuit corresponding to each cylinder group are connected to the return end of the oil tank.

5. The fine stamping equipment according to claim 4, characterized in that, Each sub-oil circuit includes a first directional valve, a second directional valve, and a first relief valve; among which... The oil inlet end of the first reversing valve constitutes the oil inlet end of the sub-oil circuit, and the oil outlet end of the first reversing valve constitutes the oil supply end of the sub-oil circuit. The oil inlet of the second directional valve is connected to the oil outlet of the first directional valve via an oil pipe; the oil outlet of the second directional valve constitutes the return oil end of this sub-oil circuit. The first overflow valve is connected between the oil outlet of the first directional valve and the oil outlet of the second directional valve.

6. The fine blanking equipment according to claim 4 or 5, characterized in that, The main oil circuit includes a third directional valve and a second relief valve; wherein... The oil inlet end of the third directional valve constitutes the oil inlet end of the main oil circuit, and the oil outlet end of the third directional valve constitutes the oil outlet end of the main oil circuit. The second relief valve is connected between the inlet and outlet ends of the third directional valve via an oil pipe.

7. The fine stamping equipment according to claim 4, characterized in that, Mechanical pressure gauges and digital pressure switches are installed on the main oil circuit and the sub-oil circuit.

8. The fine blanking equipment according to claim 4, characterized in that, An air cooler is installed on the return oil flow path corresponding to the return oil end of the oil tank.

9. The fine stamping equipment according to claim 4, characterized in that, The oil tank is equipped with an oil filter, an air filter, and a level gauge.

10. A fine blanking method, characterized in that, The method is implemented using the fine blanking equipment according to any one of claims 1-9; the fine blanking method includes: The workpiece to be stamped is placed in the first stamping station, and the workpiece to be stamped is stamped to obtain an initial stamped part; wherein, the initial stamped part has a first stamping groove; The initial stamped part is placed in the second stamping station and stamped again to obtain the final stamped part; wherein, when the initial stamped part is stamped, the second punch is located in the first stamping groove to stamp and protect the first stamping groove; the inner pressure plate stamps the initial stamped part to form a second stamping groove in the circumferential direction of the first stamping groove.

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