Small-collapse-angle fine blanking method and die

Abstract

The invention relates to a small-collapse-angle fine blanking method and die. When a lower movable male die upwards punches a to-be-machined blank to half of the thickness of the to-be-machined blank, the top of an upper movable male die abuts against an upper base plate; and the fine blanking machine controls the lower sliding block to continuously move upwards in the vertical direction, the lower movable male die exerts back pressure, the upper movable female die exerts blank holder force, and after abutting, the upper movable male die conducts reverse stamping on the blank to be machined till the lower sliding block reaches an upper dead point and stays for a preset time, and fine blanking is completed. According to the technical scheme, the to-be-machined blank is punched upwards through the lower movable male die to be punched for the first time, then the to-be-machined blank is punched reversely through the upper movable male die which abuts against the lower movable male die to be punched for the second time, corner collapse of the fine-punched part can be effectively reduced, the precision and quality of the fine-punched part are improved, and the production efficiency is improved. And the production requirements of more small-corner-collapse fine blanking parts are met.

Description

Technical Field

[0001] The present invention relates to the technical field of corner-collapse stamping, and particularly relates to a fine blanking method and a die for small corner-collapse. Background Art

[0002] During the fine blanking process, the corner-collapse will affect the quality and accuracy of the fine blanked parts. The corner-collapse refers to the phenomenon that the edge of the material bulges inward during the stamping process. The generation of the corner-collapse is due to the uneven deformation and stress distribution of the material during the stamping process, resulting in the collapse or deformation of the material at the edge.

[0003] The existing materials have a large corner-collapse after stamping, and it is difficult to meet the production requirements for some parts with strict requirements for the corner-collapse. Summary of the Invention

[0004] Therefore, it is necessary to provide a fine blanking method and a die for small corner-collapse to solve the technical problem that the existing materials have a large corner-collapse after stamping, and it is difficult to meet the production requirements for some parts with strict requirements for the corner-collapse.

[0005] To achieve the above object, in the first aspect, the present invention provides a fine blanking method for small corner-collapse, including:

[0006] S01: Placing the blank to be processed on the lower fixed female die and the lower movable male die;

[0007] S02: The fine blanking press controls the slide block to move upward in the vertical direction, and the lower fixed female die and the lower movable male die move upward in the vertical direction along with the slide block until the blank to be processed is pressed tightly against the upper movable female die and the upper movable male die;

[0008] S03: The lower oil cylinder drives the lower movable male die to move upward in the vertical direction with the punching force through the lower ejector rod, and the upper oil cylinder drives the upper movable female die through the upper ejector rod. The upper movable female die provides the blank-holding force. Under the combined action of the punching force and the blank-holding force, the blank to be processed is stamped;

[0009] S04: When the lower movable male die punches the blank to be processed upward to half of the thickness of the blank to be processed, the top of the upper movable male die abuts against the upper backing plate;

[0010] S05: The fine blanking press controls the slide block to continue to move upward in the vertical direction. The lower movable male die applies a counter pressure, and the upper movable female die applies a blank-holding force. After abutting, the upper movable male die punches the blank to be processed in the reverse direction until the slide block reaches the top dead center and stays for a preset time to complete the fine blanking;

[0011] S06: The fine blanking press controls the slide block to reset. The upper movable female die ejects the waste frame, and the lower movable male die ejects the fine blanked part.

[0012] Different from the prior art, the technical solution of this application first performs the first blanking on the blank to be processed by the lower movable punch by upward stamping, and then performs reverse stamping on the blank to be processed by the upper movable punch after abutment to complete the second blanking. The secondary blanking is equivalent to a trimming, which can effectively reduce the corner collapse of the fine blanking parts, improve the accuracy and quality of the fine blanking parts, and meet the production requirements of more fine blanking parts with small corner collapse.

[0013] As an embodiment of the present invention, the diameter of the lower movable punch is smaller than the diameter of the upper movable punch.

[0014] In this way, by setting the diameter of the lower movable punch to be smaller than the diameter of the upper movable punch, when the upper movable punch with a larger diameter performs reverse stamping, the corner collapse of the fine blanking parts can be reduced.

[0015] As an embodiment of the present invention, the diameter of the lower movable punch is 0.2 mm to 0.4 mm smaller than the diameter of the upper movable punch.

[0016] In this way, preferably setting the diameter of the lower movable punch to be 0.2 mm to 0.4 mm smaller than the diameter of the upper movable punch is equivalent to that the upper movable punch will blank 0.2 mm - 0.4 mm of material during reverse stamping, which can optimize the force distribution and material flow of the fine blanking parts during blanking, effectively reduce the corner collapse, and ensure that the shear surface is smooth after reverse punching.

[0017] To achieve the above object, in a second aspect, the present invention also provides a fine blanking die with small corner collapse, which includes a fine blanking method for performing any one of the above-mentioned provided by the present invention, and further includes:

[0018] An upper punching assembly, which includes an upper workbench, an upper backing plate, an upper fixing plate, an upper oil cylinder, an upper ejector rod, an upper movable female die and an upper movable punch. The upper backing plate is installed below the upper workbench, the upper fixing plate is installed below the upper backing plate, the upper oil cylinder is installed in the upper workbench, the output end of the upper oil cylinder is connected to the top of the upper movable female die through the upper ejector rod, the upper movable female die is located below the upper fixing plate, the upper movable punch is installed in the upper movable female die, and its top slides vertically in the upper fixing plate;

[0019] A lower punching assembly, which includes a lower slider, a lower fixing plate, a lower fixed female die, a lower movable punch, a lower oil cylinder and a lower ejector rod. The lower fixing plate is installed above the lower slider, the lower fixed female die is installed above the lower fixing plate, the lower movable punch is installed in the lower fixed female die, and its bottom slides vertically in the lower fixing plate. The lower oil cylinder is installed in the lower slider, and the output end of the lower oil cylinder is connected to the bottom of the lower movable punch through the lower ejector rod.

[0020] As an implementation manner of the present invention, a groove is provided at the bottom of the upper backing plate. The upper punching assembly further includes an elastic member, which is installed in the groove. The top of the elastic member is connected to the upper backing plate, and the bottom of the elastic member is connected to the top of the upper movable punch.

[0021] In this way, by providing the elastic member, on the one hand, a reaction force can be provided to act together with the blanking force and the blank-holding force, and part of the impact energy can be absorbed through flexible buffering, reducing the rigid collision of the die and prolonging the die life. On the other hand, after blanking is completed, the resilience of the elastic member can help eject the waste frame, prevent the waste frame from getting stuck in the die, and at the same time quickly reset the upper movable punch to prepare for the next stamping. Among them, the elastic member can be a mechanical spring or a nitrogen spring.

[0022] As an implementation manner of the present invention, two grooves are provided at the bottom of the upper backing plate at intervals in the horizontal direction, and two elastic members are provided, and each elastic member corresponds to one groove.

[0023] In this way, by providing two elastic members, a reaction force can be provided, and part of the impact energy can be better buffered and absorbed, and a better restoring force can be provided.

[0024] As an implementation manner of the present invention, a first placement groove is further provided at the bottom of the upper backing plate. The upper punching assembly further includes a position sensor, which is installed in the first placement groove. The position sensor detects the position data of the upper movable punch, and the position sensor is communicatively connected to the fine blanking press.

[0025] In this way, the position distance between the top of the upper movable punch and the bottom of the upper backing plate is detected by the position sensor. When the position data detected by the position sensor between the top of the upper movable punch and the bottom of the upper backing plate reaches the specified position data, that is, when the top of the upper movable punch abuts against the upper backing plate, the fine blanking press controls the lower movable punch to stop stamping through the lower oil cylinder.

[0026] As an implementation manner of the present invention, a second placement groove corresponding to the first placement groove is provided at the top of the upper movable punch. The upper punching assembly further includes a trigger block, which is installed in the second placement groove, and the trigger block cooperates with the position sensor.

[0027] In this way, by setting the trigger block to cooperate with the position sensor, the detection accuracy of the position sensor is improved. That is, only when the trigger block contacts the position sensor, the fine blanking press controls the lower movable punch to stop stamping.

[0028] As an implementation manner of the present invention, an upper limiting groove is provided in the upper fixing plate. The upper movable punch is T-shaped, and the top of the upper movable punch slides in the upper limiting groove.

[0029] In this way, by setting the upper limit slot, the upper movable punch is restricted to slide only in the vertical direction, and the sliding distance in the vertical direction is limited, thereby improving the overall accuracy and stability.

[0030] As an implementation manner of the present invention, a lower limit slot is provided in the lower fixing plate, the lower movable punch is in an inverted T shape, and the bottom of the lower movable punch slides in the lower limit slot.

[0031] In this way, similarly, by setting the lower limit slot, the lower movable punch is restricted to slide only in the vertical direction, and the sliding distance in the vertical direction is limited, thereby improving the overall accuracy and stability.

[0032] The above description of the invention content is only an overview of the technical solution of this application. In order to enable those of ordinary skill in the art to more clearly understand the technical solution of this application, and then can be implemented according to the content recorded in the description and the drawings, and in order to make the above objects, other objects, features and advantages of this application more easily understood, the following is described in conjunction with the specific implementation manners and drawings of this application. Brief Description of the Drawings

[0033] The drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of the specific implementation manners and other related contents of this application, and should not be considered as a limitation to this application.

[0034] In the drawings of the specification:

[0035] Figure 1 is a schematic diagram of a blank to be processed placed on the lower fixed female die and the lower movable punch in an embodiment of this application;

[0036] Figure 2 is Figure 1 an enlarged view of C in

[0037] Figure 3 is a schematic diagram of the lower slider moving upward and the upper movable female die and the upper movable punch pressing the blank to be processed in an embodiment of this application;

[0038] Figure 4 is a schematic diagram of the lower oil cylinder driving the lower movable punch to punch the blank to be processed through the lower ejector rod in an embodiment of this application;

[0039] Figure 5 is Figure 4 an enlarged view of D in

[0040] Figure 6 is a schematic diagram of the lower slider continuing to move upward to punch the blank to be processed in an embodiment of this application;

[0041] Figure 7 is a schematic diagram of the lower slider resetting in an embodiment of this application;

[0042] Figure 8 Schematic diagram of a waste bin and fine blanking part ejection for an embodiment of the present application;

[0043] Figure 9 Schematic diagram of a thick steel plate part for an embodiment of the present application;

[0044] Figure 10 Schematic diagram of a corner collapse test piece for an embodiment of the present application.

[0045] The reference numerals involved in the above-mentioned drawings are explained as follows:

[0046] 1 - Upper punching assembly; 11 - Workbench; 12 - Upper backing plate; 13 - Upper fixing plate; 131 - Upper limit groove; 14 - Upper oil cylinder; 15 - Upper ejector rod; 16 - Upper movable female die; 17 - Upper movable male die; 18 - Elastic member; 191 - Position sensor; 192 - Trigger block; 2 - Lower punching assembly; 21 - Lower slide block; 22 - Lower fixing plate; 221 - Lower limit groove; 23 - Lower fixed female die; 24 - Lower movable male die; 25 - Lower oil cylinder; 26 - Lower ejector rod; 27 - Lower backing plate; 3 - Blank to be processed; 31 - Waste bin; 32 - Fine blanking part; Y - Vertical direction; a - Diameter of the lower movable male die; b - Diameter of the upper movable male die. Detailed implementation manners

[0047] To illustrate in detail the possible application scenarios, technical principles, implementable specific solutions, achievable purposes and effects, etc. of the present application, the following is described in detail with reference to the specific embodiments listed and in conjunction with the drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, so they are only examples and cannot be used to limit the protection scope of the present application.

[0048] Referring to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various positions in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0049] Unless otherwise defined, the meanings of the technical terms used herein are the same as those commonly understood by those skilled in the technical field to which the present application belongs; the use of the relevant terms herein is only for describing specific embodiments and is not intended to limit the present application.

[0050] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that there can be three relationships. For example, A and / or B means: there is A, there is B, and there is both A and B at the same time. In addition, the character " / " in this text generally represents an "or" logical relationship between the associated objects before and after.

[0051] In this application, terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantitative, primary-secondary or sequential relationships between these entities or operations.

[0052] Without further limitation, in this application, the open expressions such as "include", "comprise", "have" or other similar expressions used in the statements are intended to cover non-exclusive inclusion. These expressions do not exclude the possibility that there may be additional elements in the process, method or product including the said elements. Thus, a process, method or product including a series of elements may not only include those defined elements, but also include other elements not explicitly listed, or elements inherent to such process, method or product.

[0053] Similar to the understanding in the "Examination Guidelines", in this application, expressions such as "greater than", "less than", "exceeding" are understood not to include the number itself; expressions such as "above", "below", "within" are understood to include the number itself. In addition, in the description of the embodiments of this application, the meaning of "a plurality of" is two or more (including two). Similar expressions related to "many", such as "multiple groups", "multiple times", etc., are understood in this way unless otherwise specifically defined.

[0054] In the description of the embodiments of this application, the spatially related expressions used, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "perpendicular", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiment or the drawings. It is only for the convenience of describing the specific embodiments of this application or for the reader's understanding, rather than indicating or implying that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of this application.

[0055] Unless otherwise clearly specified or defined, in the description of the embodiments of the present application, terms such as "installation", "connection", "linkage", "fixation", "setting", etc. shall be understood in a broad sense. For example, the "connection" may be a fixed connection, a detachable connection, or an integral setting; it may be directly connected, or indirectly connected through an intermediate medium; it may be a relationship in which two components are combined together, or a relationship of interaction between two components, or a connection inside two structures. Those skilled in the art to which the present application pertains can understand the specific meanings of the above terms in the embodiments of the present application according to specific circumstances.

[0056] The existing materials have a large corner collapse after stamping. For some parts with strict requirements for corner collapse, it is difficult to meet the production requirements. In view of this, the embodiments of the present application provide a fine blanking method with a small corner collapse, including:

[0057] S01: Place the blank 3 to be processed on the lower fixed female die 23 and the lower movable male die 24;

[0058] S02: The fine blanking press controls the lower slider 21 to move upward along the vertical direction Y. The lower fixed female die 23 and the lower movable male die 24 move upward along the vertical direction Y with the lower slider 21 until the blank 3 to be processed is pressed tightly against the upper movable female die 16 and the upper movable male die 17;

[0059] S03: The lower oil cylinder 25 drives the lower movable male die 24 to move upward along the vertical direction Y with a blanking force through the lower ejector rod 26. The upper oil cylinder 14 drives the upper movable female die 16 through the upper ejector rod 15. The upper movable female die 16 provides a blank holding force. Under the combined action of the blanking force and the blank holding force, the blank 3 to be processed is stamped;

[0060] S04: When the lower movable male die 24 stamps the blank 3 to be processed upward to half of the thickness of the blank 3 to be processed, the top of the upper movable male die 17 abuts against the upper backing plate 12;

[0061] S05: The fine blanking press controls the lower slider 21 to continue moving upward along the vertical direction Y. The lower movable male die 24 applies a counter pressure, and the upper movable female die 16 applies a blank holding force. The upper movable male die 17 after abutment performs reverse stamping on the blank 3 to be processed until the lower slider 21 reaches the top dead center and stays for a preset time to complete fine blanking;

[0062] S06: The fine blanking press controls the lower slider 21 to reset. The upper movable female die 16 ejects the waste frame 31, and the lower movable male die 24 ejects the fine blanked part 32.

[0063] According to some embodiments of the present application, please refer to Figures 1 to 8 , this embodiment relates to a fine blanking method with a small corner collapse, including:

[0064] S01: AsFigure 1 As shown, place the blank 3 to be processed on the lower fixed concave die 23 and the lower movable convex die 24;

[0065] S02: As Figure 3 shown, the fine blanking press controls the lower slide block 21 to move upward along the vertical direction Y, and the lower fixed concave die 23 and the lower movable convex die 24 move upward along the vertical direction Y with the lower slide block 21 until the blank 3 to be processed is pressed tightly against the upper movable concave die 16 and the upper movable convex die 17;

[0066] S03: As Figure 4 shown, the lower oil cylinder 25 drives the lower movable convex die 24 to move upward along the vertical direction Y with a blanking force through the lower ejector rod 26, and the upper oil cylinder 14 drives the upper movable concave die 16 through the upper ejector rod 15. The upper movable concave die 16 provides a blank-holding force. Under the combined action of the blanking force and the blank-holding force, the blank 3 to be processed is stamped;

[0067] S04: As Figure 4 and Figure 5 shown, when the lower movable convex die 24 stamps the blank 3 to be processed upward to half of the thickness of the blank 3 to be processed, the top of the upper movable convex die 17 abuts against the upper backing plate 12;

[0068] S05: As Figure 6 shown, the fine blanking press controls the lower slide block 21 to continue moving upward along the vertical direction Y. The lower movable convex die 24 applies a counter pressure, and the upper movable concave die 16 applies a blank-holding force. The upper movable convex die 17 after abutment stamps the blank 3 to be processed in the reverse direction until the lower slide block 21 reaches the top dead center and stays for a preset time (such as 10 s or 60 s, etc., specifically set according to the size of the blank 3 to be processed) and then the fine blanking is completed;

[0069] S06: As Figure 7 and Figure 8 shown, the fine blanking press controls the lower slide block 21 to reset. The upper movable concave die 16 ejects the waste frame 31, and the lower movable convex die 24 ejects the fine blanking part 32.

[0070] Before step S01, there is also step S00: According to the size and accuracy requirements of the blank to be processed, select a suitable special fine blanking press, and install the small corner radius fine blanking die on the fine blanking press according to the die installation requirements. It should be emphasized in step S00 that: according to the size and thickness of the blank to be processed, determine the diameters b of the lower movable convex die 24 and the upper movable convex die, and ensure that the diameter of the lower movable convex die 24 is 0.2 mm to 0.4 mm smaller than the diameter of the upper movable convex die 17.

[0071] The technical solution of this application first performs the first blanking on the blank 3 to be processed by the lower movable punch 24 by upward stamping, and then performs reverse stamping on the blank 3 to be processed by the upper movable punch 17 after abutment to complete the second blanking. The secondary blanking is equivalent to a trimming, which can effectively reduce the corner drop of the fine blanking part 32, improve the accuracy and quality of the fine blanking part 32, and meet the production requirements of more fine blanking parts 32 with small corner drops.

[0072] As Figure 1 and Figure 6 shown, the diameter a of the lower movable punch is smaller than the diameter b of the upper movable punch.

[0073] In this way, by setting the diameter a of the lower movable punch to be smaller than the diameter b of the upper movable punch, when the upper movable punch 17 with a larger diameter performs reverse stamping, the corner drop of the fine blanking part 32 can be reduced.

[0074] According to some embodiments of this application, optionally, the diameter a of the lower movable punch is 0.2 mm to 0.4 mm smaller than the diameter b of the upper movable punch.

[0075] In this way, preferably setting the diameter a of the lower movable punch to be 0.2 mm to 0.4 mm smaller than the diameter b of the upper movable punch is equivalent to the upper movable punch 17 punching 0.2 mm - 0.4 mm of material during reverse stamping, which can optimize the force distribution and material flow of the fine blanking part 32 during blanking, effectively reduce the corner drop, and ensure that the shear surface is smooth after reverse punching.

[0076] According to some embodiments of this application, please refer to Figures 1 to 8 , this embodiment also relates to a fine blanking die with small corner drops, which includes a fine blanking method for performing small corner drops, and further includes an upper punching assembly 1 and a lower punching assembly 2. The upper punching assembly 1 includes an upper workbench 11, an upper backing plate 12, an upper fixing plate 13, an upper oil cylinder 14, an upper ejector rod 15, an upper movable female die 16, and an upper movable punch 17. The upper backing plate 12 is installed below the upper workbench 11, the upper fixing plate 13 is installed below the upper backing plate 12, the upper oil cylinder 14 is installed in the upper workbench 11, the output end of the upper oil cylinder 14 is connected to the top of the upper movable female die 16 through the upper ejector rod 15, the upper movable female die 16 is located below the upper fixing plate 13, the upper movable punch 17 is installed in the upper movable female die 16, and its top slides vertically in the upper fixing plate 13 along the vertical direction Y; the lower punching assembly 2 includes a lower slider 21, a lower fixing plate 22, a lower fixed female die 23, a lower movable punch 24, a lower oil cylinder 25, and a lower ejector rod 26. The lower fixing plate 22 is installed above the lower slider 21, the lower fixed female die 23 is installed above the lower fixing plate 22, the lower movable punch 24 is installed in the lower fixed female die 23, and its bottom slides vertically in the lower fixing plate 22 along the vertical direction Y. The lower oil cylinder 25 is installed in the lower slider 21, and the output end of the lower oil cylinder 25 is connected to the bottom of the lower movable punch 24 through the lower ejector rod 26.

[0077] There are two upper ejector rods 15. The top of the upper ejector rod 15 is connected to the output end of the upper oil cylinder 14. The bottom of the upper ejector rod 15 sequentially passes through the upper backing plate 12 and the upper fixing plate 13 and is then connected to the top of the upper movable female die 16. Among them, the upper movable male die 17 is located between the two upper ejector rods 15.

[0078] Optionally, the lower punching assembly 2 further includes a lower backing plate 27, and the lower backing plate 27 is installed between the lower sliding block 21 and the lower fixing plate 22. There are two lower ejector rods 26. The bottom of the lower ejector rod 26 is connected to the output end of the lower oil cylinder 25. The top of the lower ejector rod 26 passes through the lower backing plate 27 and then enters the lower fixing plate 22 to be connected to the bottom of the lower movable male die 24.

[0079] As Figure 2 and Figure 5 shown, a groove is provided at the bottom of the upper backing plate 12. The upper punching assembly 1 further includes an elastic member 18. The elastic member 18 is installed in the groove. The top of the elastic member 18 is connected to the upper backing plate 12, and the bottom of the elastic member 18 is connected to the top of the upper movable male die 17.

[0080] The elastic member 18 has elasticity. It can elastically contract when subjected to pressure and can restore its initial shape when the pressure disappears. The elastic member 18 can be made of metal elastic materials such as metal springs, or can also be made of non-metal elastic materials such as rubber and silica gel. Among them, the elastic member 18 can be a mechanical spring or a nitrogen spring.

[0081] When the elastic member 18 is provided:

[0082] In step S03, it should be emphasized that: the lower oil cylinder 25 drives the lower movable male die 24 to move upward along the vertical direction Y with a punching force through the lower ejector rod 26. The upper oil cylinder 14 drives the upper movable female die 16 through the upper ejector rod 15. The upper movable female die 16 provides a blank-holding force. The elastic member 18 gives pressure to the upper movable male die 17. Under the combined action of the punching force, the blank-holding force and the pressure of the elastic member 18, the blank 3 to be processed is stamped.

[0083] In step S04, it should be emphasized that: when the lower movable male die 24 punches the blank 3 to be processed upward to half the thickness of the blank 3 to be processed, the top of the upper movable male die 17 abuts against the upper backing plate 12. The lower movable male die 24 gives a reaction force. At the same time, the elastic member 18 is completely compressed into the groove.

[0084] In step S06, it should be emphasized that: the fine blanking press controls the lower sliding block 21 to reset. The upper movable female die 16 ejects the waste frame 31. At the same time, the elastic member 18 returns to its original state, and the lower movable male die 24 ejects the fine blanking part 32.

[0085] In this way, by setting the elastic member 18, on the one hand, a counter-pressure can be provided to act together with the blanking force and the blank-holding force, and part of the impact energy can be absorbed through flexible buffering, reducing the rigid collision of the die and prolonging the service life of the die. On the other hand, after the blanking is completed, the resilience of the elastic member 18 can help eject the waste frame 31, prevent the waste frame 31 from getting stuck in the die, and at the same time quickly reset the upper movable punch 17 to prepare for the next stamping.

[0086] As Figure 2 and Figure 5 shown, two grooves are horizontally spaced apart at the bottom of the upper backing plate 12, two elastic members 18 are provided, and each elastic member 18 corresponds to one groove.

[0087] In this way, by setting two elastic members 18, a counter-pressure can be provided and part of the impact energy can be better buffered and absorbed, and a better restoring force can be provided.

[0088] As Figure 2 and Figure 5 shown, a first placement groove is also provided at the bottom of the upper backing plate 12. The upper punching assembly 1 further includes a position sensor 191. The position sensor 191 is installed in the first placement groove. The position sensor 191 detects the position data of the upper movable punch 17, and the position sensor 191 is communicatively connected to the fine blanking press.

[0089] In this way, by setting the position sensor 191 to detect the position distance between the top of the upper movable punch 17 and the bottom of the upper backing plate 12. When the position data detected by the position sensor 191 between the top of the upper movable punch 17 and the bottom of the upper backing plate 12 reaches the specified position data, that is, when the top of the upper movable punch 17 abuts against the upper backing plate 12, the fine blanking press controls the lower movable punch 24 to stop stamping through the lower oil cylinder 25.

[0090] As Figure 2 and Figure 5 shown, a second placement groove corresponding to the first placement groove is provided at the top of the upper movable punch 17. The upper punching assembly 1 further includes a trigger block 192. The trigger block 192 is installed in the second placement groove, and the trigger block 192 cooperates with the position sensor 191.

[0091] In this way, by setting the trigger block 192 to cooperate with the position sensor 191, the detection accuracy of the position sensor 191 is improved. That is, only when the trigger block 192 contacts the position sensor 191 does the fine blanking press control the lower movable punch 24 to stop stamping.

[0092] As Figure 1 shown, an upper limit groove 131 is provided in the upper fixing plate 13. The upper movable punch 17 is T-shaped, and the top of the upper movable punch 17 slides in the upper limit groove 131.

[0093] Thus, by setting the upper limit slot 131, the upper movable punch 17 is restricted to slide only in the vertical direction Y, and the sliding distance in the vertical direction Y is restricted, thereby improving the overall accuracy and stability.

[0094] As Figure 1 shown, a lower limit slot 221 is formed in the lower fixing plate 22. The lower movable punch 24 is in an inverted T shape, and the bottom of the lower movable punch 24 slides in the lower limit slot 221.

[0095] Thus, similarly, by setting the lower limit slot 221, the lower movable punch 24 is restricted to slide only in the vertical direction Y, and the sliding distance in the vertical direction Y is restricted, thereby improving the overall accuracy and stability.

[0096] As Figure 9 shown, taking a 4.6 mm thick C45E steel plate part as an example, different parameters are used. As Figure 10 shown, by adopting a small corner-collapse fine blanking method and die, the corner-collapse at the 39-degree sharp corner of the corner-collapse test piece can be reduced from 1.5 mm of the traditional method to 0.5 mm at most, and the shearing surface is smooth.

[0097] It should be noted that although the above embodiments have been described in this article, the patent protection scope of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, the changes and modifications made to the embodiments described in this article, or the equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, directly or indirectly applying the above technical solutions to other related technical fields, are all included in the patent protection scope of the present invention.

Claims

1. A fine blanking method for small corner collapse, characterized in that Including: S01: Place the blank to be processed on the lower fixed female die and the lower movable male die; S02: The fine blanking press controls the slide block to move upward in the vertical direction, and the lower fixed female die and the lower movable male die move upward in the vertical direction along with the slide block until the blank to be processed is pressed against the upper movable female die and the upper movable male die; S03: The lower oil cylinder drives the lower movable male die to move upward in the vertical direction with a blanking force through the lower ejector rod, and the upper oil cylinder drives the upper movable female die through the upper ejector rod. The upper movable female die provides a blank-holding force. Under the combined action of the blanking force and the blank-holding force, the blank to be processed is stamped; S04: When the lower movable male die stamps the blank to be processed upward to half of the thickness of the blank to be processed, the top of the upper movable male die abuts against the upper backing plate; S05: The fine blanking press controls the slide block to continue to move upward in the vertical direction. The lower movable male die applies a counter pressure, and the upper movable female die applies a blank-holding force. After abutting, the upper movable male die performs reverse stamping on the blank to be processed until the slide block reaches the top dead center and stays for a preset time to complete fine blanking; S06: The fine blanking press controls the slide block to reset. The upper movable female die ejects the waste frame, and the lower movable male die ejects the fine blanking part.

2. The fine blanking method for small corner collapse according to claim 1, wherein The diameter of the lower movable male die is smaller than the diameter of the upper movable male die.

3. The fine blanking method for small corner collapse according to claim 2, wherein The diameter of the lower movable male die is 0.2 mm to 0.4 mm smaller than the diameter of the upper movable male die.

4. A fine blanking die for small corner collapse, characterized in that, Including a small corner collapse fine blanking method for performing as described in any one of claims 1 to 3, further including: An upper stamping assembly, the upper stamping assembly includes an upper workbench, an upper backing plate, an upper fixing plate, an upper oil cylinder, an upper ejector rod, an upper movable female die, and an upper movable male die. The upper backing plate is installed below the upper workbench, the upper fixing plate is installed below the upper backing plate, the upper oil cylinder is installed in the upper workbench, the output end of the upper oil cylinder is connected to the top of the upper movable female die through the upper ejector rod, the upper movable female die is located below the upper fixing plate, the upper movable male die is installed in the upper movable female die, and its top slides in the upper fixing plate in the vertical direction; A lower stamping assembly, the lower stamping assembly includes a slide block, a lower fixing plate, a lower fixed female die, a lower movable male die, a lower oil cylinder, and a lower ejector rod. The lower fixing plate is installed above the slide block, the lower fixed female die is installed above the lower fixing plate, the lower movable male die is installed in the lower fixed female die, and its bottom slides in the lower fixing plate in the vertical direction. The lower oil cylinder is installed in the slide block, and the output end of the lower oil cylinder is connected to the bottom of the lower movable male die through the lower ejector rod.

5. The fine blanking die with a small corner collapse according to claim 4, characterized in that, A groove is provided at the bottom of the upper backing plate. The upper stamping assembly further includes an elastic member. The elastic member is installed in the groove. The top of the elastic member is connected to the upper backing plate, and the bottom of the elastic member is connected to the top of the upper movable male die.

6. The fine blanking die with small collapse angle according to claim 5, characterized in that, Two grooves are provided at the bottom of the upper backing plate at intervals in the horizontal direction. Two elastic members are provided, and each elastic member corresponds to one groove.

7. The fine blanking die with a small corner collapse according to claim 4, characterized in that, A first placement groove is further formed in the bottom of the upper backing plate. The upper punching assembly further includes a position sensor which is installed in the first placement groove. The position sensor detects the position data of the upper movable punch, and the position sensor is communicatively connected to the fine blanking press.

8. The fine blanking die with small corner collapse according to claim 7, characterized in that, A second placement groove corresponding to the first placement groove is formed in the top of the upper movable punch. The upper punching assembly further includes a trigger block which is installed in the second placement groove. The trigger block cooperates with the position sensor.

9. The fine blanking die with small corner collapse according to claim 4, characterized in that, An upper limiting groove is formed in the upper fixing plate. The upper movable punch is T-shaped, and the top of the upper movable punch slides in the upper limiting groove.

10. The fine blanking die with small corner collapse according to claim 4, characterized in that, A lower limiting groove is formed in the lower fixing plate. The lower movable punch is inverted T-shaped, and the bottom of the lower movable punch slides in the lower limiting groove.

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