Blind hole punching method and device

Abstract

The invention relates to a blind hole stamping method and device, and the method comprises the steps: reverse forming of a recess: a to-be-processed plate is pre-pressed through a recess die, a recess part is formed at the bottom of the to-be-processed plate, the recess part is a reserved material containing space, and meanwhile, a convex part is formed at the top, corresponding to the recess part, of the to-be-processed plate; and the to-be-machined plate where the concave part and the convex part are formed is punched through a punching die, the material directionally flows towards the concave part in the punching process, and the blind hole is formed. According to the technical scheme, the to-be-machined plate is pre-pressed through the concave die, the concave part is formed in the bottom of the to-be-machined plate, the convex part is formed on the top of the to-be-machined plate, then the to-be-machined plate with the concave part and the convex part is punched, and the concave part can just contain materials extruded out of the blind hole in the punching process; and the procedure of milling the blind hole boss is directly omitted, so that the cost is reduced. And due to work hardening in the machining process, cracks existing in the material between the hole bottom and the hole wall can be reduced, and the plate performance is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of blind hole stamping, and particularly to a blind hole stamping method and device. Background Art

[0002] Stamping blind holes is a common metal processing technology, which is widely used in industries such as automobiles, household appliances, and machinery manufacturing. It can effectively form various blind hole structures on metal materials for fixing fasteners, installing components, etc.

[0003] As Figure 1 shown, in the prior art, a blind hole is formed by punching with a punch, and then the excess part at the bottom of the plate is milled. Directly extruding the blind hole forward easily causes cracks in the material between the hole bottom and the hole wall, reducing the performance of the plate. Summary of the Invention

[0004] Therefore, it is necessary to provide a blind hole stamping method and device to solve the technical problem that directly extruding the blind hole forward easily causes cracks in the material between the hole bottom and the hole wall, reducing the performance of the plate.

[0005] To achieve the above object, in the first aspect, the present invention provides a blind hole stamping method, including:

[0006] Inverse forming depression:

[0007] Pre-press the plate to be processed through a depression die, and a depression part is formed at the bottom of the plate to be processed. The depression part is a reserved material-containing space. At the same time, a protruding part is formed at the top of the plate to be processed corresponding to the depression part;

[0008] Stamping blind hole:

[0009] Stamp the plate to be processed with the depression part and the protruding part through a stamping die. During the stamping process, the material flows directionally towards the depression part to form a blind hole.

[0010] Different from the prior art, the above technical solution first pre-presses the plate to be processed through a depression die, so that a depression part is formed at the bottom of the plate to be processed and a protruding part is formed at the top. Then, the plate to be processed with the depression part and the protruding part is stamped. During the stamping process, the depression part can just accommodate the material extruded from the blind hole, directly omitting the process of milling the blind hole boss, reducing the cost. And due to the work hardening during the processing process, the cracks in the material between the hole bottom and the hole wall can be reduced, improving the performance of the plate.

[0011] To achieve the above object, in the second aspect, the present invention also provides a blind hole stamping device, including:

[0012] A recessed mold, the recessed mold includes an upper slider, a forming female die, an oil cylinder, a ejector rod, and a forming male die. A forming female die is installed below the upper slider. The oil cylinder is installed inside the upper slider. The output end of the oil cylinder is connected to the top of the forming female die through the ejector rod. The forming male die is located below the forming female die. A groove is provided on the forming female die, and a protrusion is provided at a corresponding position of the groove on the forming male die. The forming male die is used for placing the plate to be processed.

[0013] A stamping die, the stamping die includes a blank holder, a stamping punch, and a stamping female die. The stamping punch slides vertically inside the blank holder, and the stamping female die is located below the blank holder.

[0014] Through the groove and the protrusion in the above technical solution, the plate to be processed can be pre-pressed so that a recessed portion is formed at the bottom of the plate to be processed and a protruding portion is formed at the top. And through the stamping punch, a blind hole can be stamped on the plate to be processed with the recessed portion and the protruding portion. The work hardening during the stamping process can reduce the cracks in the material between the hole bottom and the hole wall and improve the performance of the plate.

[0015] As an embodiment of the present invention, the recessed mold further includes an upper backing plate and a positioning punch. The upper backing plate is installed below the upper slider. The top of the positioning punch is installed at the bottom of the upper backing plate. The positioning punch slides vertically inside the forming female die. A first hole is provided at a corresponding position of the forming male die for the positioning punch.

[0016] The stamping die further includes a positioning pin. The positioning pin slides vertically inside the blank holder. A second hole is provided at a corresponding position of the stamping female die for the positioning pin.

[0017] In this way, by setting the positioning punch, a positioning hole can be processed on the plate to be processed. After that, when the stamping die stamps the blind hole, the positioning pin can be matched with the positioning hole, so as to accurately position the recessed portion and the protruding portion of the plate to be processed with the stamping punch, and reduce the surface defects such as part indentation caused by clamping during the machining process.

[0018] As an embodiment of the present invention, the bottom of the positioning pin is arc-shaped.

[0019] In this way, the arc-shaped setting can provide an automatic guiding function at the initial contact, allow self-correction of minor deviations, and avoid jamming or scratching caused by slight misalignment between the positioning pin and the positioning hole. In addition, when in arc surface contact, the load is distributed in a larger area, avoiding excessive wear at the local edge and maintaining long-term positioning stability.

[0020] As an embodiment of the present invention, a placement groove is provided at a corresponding position of the top of the stamping female die for the stamping punch. The stamping die further includes a sensor. The sensor is installed in the placement groove. The sensor is communicatively connected to the stamping machine control system. The sensor detects the flatness of the plate to be processed placed on the stamping female die.

[0021] In this way, by setting up the sensor, the flatness of the to-be-processed sheet placed on the stamping female die can be detected. When the flatness of the to-be-processed sheet detected by the sensor reaches the preset flatness, the stamping machine control system controls the stamping punch to stop stamping the blind hole, ensuring the flatness of the bottom of the to-be-processed sheet.

[0022] As an implementation manner of the present invention, the stamping die further includes an alarm, and the alarm is communicatively connected to the stamping machine control system.

[0023] In this way, by setting up the alarm, the staff can be further reminded to stop stamping the blind hole.

[0024] As an implementation manner of the present invention, the stamping die further includes a blank-holding mechanism, and the blank-holding mechanism is connected to the blank-holding plate.

[0025] In this way, by setting up the blank-holding mechanism to provide a blank-holding force to the blank-holding plate, the blank-holding mechanism can accurately control the flow of the material during the forming process, so as to better form the blind hole. Among them, the specific pressure value can be set according to the actual situation.

[0026] As an implementation manner of the present invention, the protrusion is a spherical protrusion.

[0027] In this way, the spherical protrusion has an arc transition, which can better form the concave part and the convex part on the to-be-processed sheet. And the spherical protrusion can also reduce the stress concentration.

[0028] As an implementation manner of the present invention, the depth of the protrusion is less than or equal to 1.5P.

[0029] In this way, it is preferably set that the depth of the protrusion is less than or equal to 1.5P, so that the depth of the concave part formed on the to-be-processed sheet is also less than or equal to 1.5P, thereby ensuring that there is enough material storage space reserved for the subsequent process. Among them, P is the part flatness, and P is 0.1 mm to 0.4 mm.

[0030] As an implementation manner of the present invention, the radius of the protrusion is 2t to 3t.

[0031] In this way, according to the actual situation, it is preferably set that the radius of the protrusion is 2t to 3t, so as to ensure that there is enough material storage space reserved for the subsequent process. Among them, t is the material thickness.

[0032] The above relevant descriptions of the invention content are 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 accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, effects, etc. of the specific embodiments of the present application and other related contents, and should not be considered as a limitation to the present application.

[0034] In the accompanying drawings of the specification:

[0035] Figure 1 It is a stamping step diagram of blind hole stamping for the background technology;

[0036] Figure 2 It is a schematic diagram of a to-be-processed plate placed on a recessed mold in an embodiment of the present application;

[0037] Figure 3 It is a schematic diagram of a recessed mold pressing a to-be-processed plate in an embodiment of the present application;

[0038] Figure 4 It is a schematic diagram of a recessed mold stamping a to-be-processed plate in an embodiment of the present application;

[0039] Figure 5 It is a schematic diagram of a to-be-processed plate with a recessed part and a protruding part placed on a stamping mold in an embodiment of the present application;

[0040] Figure 6 It is a schematic diagram of a stamping mold pressing a to-be-processed plate in an embodiment of the present application;

[0041] Figure 7 It is a schematic diagram of a stamping mold stamping a to-be-processed plate in an embodiment of the present application;

[0042] Figure 8 It is a schematic diagram of the completion of blind hole stamping of a to-be-processed plate in an embodiment of the present application;

[0043] Figure 9 It is a schematic diagram of a mounting plate in an embodiment of the present application.

[0044] The explanations of the reference numerals involved in the above accompanying drawings are as follows:

[0045] 1 - recessed mold; 11 - upper slider; 12 - forming female die; 121 - groove; 13 - oil cylinder; 14 - ejector rod; 15 - forming male die; 151 - protrusion; 152 - first hole; 16 - upper backing plate; 17 - positioning punch; 2 - stamping mold; 21 - blank holder; 22 - stamping punch; 23 - stamping female die; 231 - second hole; 24 - positioning pin; 25 - sensor; 3 - to-be-processed plate; 31 - positioning hole; Y - vertical direction. Specific Embodiments

[0046] To elaborate in detail on the possible application scenarios, technical principles, specific implementable solutions, achievable objectives and effects of this application, etc., the following will be described in detail with reference to the specific examples listed and in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of this application, so they are only examples and cannot be used to limit the protection scope of this application.

[0047] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. The term "embodiment" that appears 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 this application, as long as there is no technical contradiction or conflict, the various technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0048] 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 this application belongs; the use of the relevant terms herein is only for describing specific embodiments and is not intended to limit this application.

[0049] In the description of this application, the phrase "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: A exists, B exists, and both A and B exist simultaneously. In addition, the character " / " herein generally represents an "or" logical relationship between the associated objects before and after.

[0050] 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, etc. between these entities or operations.

[0051] Without more limitations, in this application, the open-ended expressions such as "including", "comprising", "having" 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, so that the process, method or product including a series of elements may include not only those defined elements, but also other elements not explicitly listed, or elements inherent to such process, method or product.

[0052] Similar to the understanding in the "Examination Guidelines", in this application, expressions such as "greater than", "less than", "exceeding" are understood to exclude the base number; expressions such as "above", "below", "within" are understood to include the base number. In addition, in the description of the embodiments of this application, the meaning of "multiple" is two or more (including two), and similar expressions related to "many" are understood in the same way, such as "multiple groups", "multiple times", etc., unless otherwise specifically limited.

[0053] 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., the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the specific embodiment or the drawing, and is only for the convenience of describing the specific embodiment of this application or facilitating 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, so it cannot be understood as a limitation on the embodiments of this application.

[0054] Unless otherwise clearly specified or limited, in the description of the embodiments of this application, the terms "installed", "connected", "joined", "fixed", "set", etc. should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be directly connected, or indirectly connected through an intermediate medium; it can be the relationship between two components combined together, or the interaction relationship between two components, or the communication inside two structures. For those skilled in the art to which this application pertains, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0055] As Figure 1 shown, in the prior art, a blind hole is formed by punching with a punch, and then the excess part at the bottom of the plate is milled. Directly extruding the blind hole forward easily causes cracks in the material between the hole bottom and the hole wall, reducing the performance of the plate.

[0056] In view of this, the embodiments of this application provide a blind hole stamping method, including reverse forming a depression: pre-pressing the to-be-processed plate 3 through a depression mold 1, a depression part is formed at the bottom of the to-be-processed plate 3, and the depression part is a reserved material-containing space. At the same time, a protruding part is formed at the top of the to-be-processed plate 3 corresponding to the depression part; stamping a blind hole: stamping the to-be-processed plate 3 with the depression part and the protruding part formed through a stamping mold 2, and during the stamping process, the material flows directionally into the depression part to form a blind hole.

[0057] According to some embodiments of this application, please refer to Figures 2 to 8, this embodiment relates to a blind hole stamping method, including reverse forming a depression: pre-pressing a to-be-processed plate 3 through a depression die 1, a depression part is formed at the bottom of the to-be-processed plate 3, and the depression part is a reserved material accommodating space. At the same time, a protruding part is formed at the top of the to-be-processed plate 3 corresponding to the depression part; stamping a blind hole: stamping the to-be-processed plate 3 with the depression part and the protruding part through a stamping die 2, and during the stamping process, the material flows directionally towards the depression part to form a blind hole.

[0058] In the above technical solution, the to-be-processed plate 3 is pre-pressed through the depression die 1 first, so that a depression part is formed at the bottom of the to-be-processed plate 3 and a protruding part is formed at the top. Then, the to-be-processed plate 3 with the depression part and the protruding part is stamped. During the stamping process, the depression part can just accommodate the material extruded from the blind hole, directly omitting the process of milling the blind hole boss, reducing the cost. And due to the work hardening during the processing, the crack between the bottom and the wall of the hole can be reduced, improving the performance of the plate.

[0059] According to some embodiments of the present application, please refer to Figures 2 to 8 , this embodiment also relates to a blind hole stamping device, including a depression die 1 and a stamping die 2. The depression die 1 includes an upper slider 11, a forming female die 12, an oil cylinder 13, a ejector rod 14 and a forming male die 15. A forming female die 12 is installed below the upper slider 11. The oil cylinder 13 is installed in the upper slider 11, and the output end of the oil cylinder 13 is connected to the top of the forming female die 12 through the ejector rod 14. The forming male die 15 is located below the forming female die 12. A groove 121 is formed on the forming female die 12, and a protrusion 151 is arranged at a position corresponding to the groove 121 on the forming male die 15. The forming male die 15 is used for placing the to-be-processed plate 3; the stamping die 2 includes a blank holder 21, a stamping punch 22 and a stamping female die 23. The stamping punch 22 slides vertically along the Y direction in the blank holder 21, and the stamping female die 23 is located below the blank holder 21.

[0060] In the above technical solution, the to-be-processed plate 3 can be pre-pressed through the groove 121 and the protrusion 151, so that a depression part is formed at the bottom of the to-be-processed plate 3 and a protruding part is formed at the top. And the to-be-processed plate 3 with the depression part and the protruding part can be stamped with a blind hole through the stamping punch 22. The work hardening during the stamping process can reduce the crack between the bottom and the wall of the hole, improving the performance of the plate.

[0061] Such as Figures 2 to 8As shown in the figure, the recessed mold 1 further includes an upper backing plate 16 and a positioning punch 17. The upper backing plate 16 is installed below the upper slide block 11. The top of the positioning punch 17 is installed at the bottom of the upper backing plate 16. The positioning punch 17 slides vertically along the Y direction within the forming female die 12. A first hole 152 is provided at the corresponding position of the forming male die 15 with respect to the positioning punch 17. The stamping die 2 further includes a positioning pin 24. The positioning pin 24 slides vertically along the Y direction within the blank holder 21. A second hole 231 is provided at the corresponding position of the stamping female die 23 with respect to the positioning pin 24.

[0062] In this way, by providing the positioning punch 17, a positioning hole 31 can be formed on the workpiece plate 3 to be processed. After that, when the stamping die 2 punches the blind hole, the positioning pin 24 can cooperate with the positioning hole 31, so as to accurately position the recessed part and the protruding part of the workpiece plate 3 to be processed, and reduce surface defects such as part indentation caused by clamping during the machining process.

[0063] As Figures 5 to 8 shown in the figure, the bottom of the positioning pin 24 is arc-shaped.

[0064] In this way, the arc-shaped setting can provide an automatic guiding effect at the initial contact, allowing self-correction of minor deviations, and avoiding jamming or scratching caused by slight misalignment between the positioning pin 24 and the positioning hole 31. In addition, when in arc surface contact, the load is distributed over a larger area, avoiding excessive wear at the local edge and maintaining long-term positioning stability.

[0065] As Figures 5 to 8 shown in the figure, a placement groove is provided at the top of the stamping female die 23 at the corresponding position of the stamping punch 22. The stamping die 2 further includes a sensor 25. The sensor 25 is installed in the placement groove. The sensor 25 is communicatively connected to the stamping machine control system. The sensor 25 detects the flatness of the workpiece plate 3 placed on the stamping female die 23.

[0066] The sensor 25 can be a laser displacement sensor 25 (by emitting a laser beam to the measured surface, calculating the distance based on the position or phase change of the reflected light, and generating surface profile data) or an ultrasonic sensor 25 (emitting ultrasonic waves and receiving the echo, calculating the distance through the time difference, and performing multi-point measurement to form a plane profile) or a structured light / 3D vision sensor 25 (projecting a specific grating or dot matrix onto the object surface, capturing the deformed pattern through a camera, and reconstructing the surface in combination with the triangulation method).

[0067] In this way, by providing the sensor 25, the flatness of the workpiece plate 3 placed on the stamping female die 23 can be detected. When the sensor 25 detects that the flatness of the workpiece plate 3 reaches the preset flatness, the stamping machine control system controls the stamping punch 22 to stop punching the blind hole, ensuring the flatness of the bottom of the workpiece plate 3 to be processed.

[0068] According to some embodiments of the present application, optionally, the stamping die 2 further includes an alarm, and the alarm is communicatively connected to the stamping machine control system.

[0069] The alarm can emit sound and / or color, etc. Thus, by setting the alarm, the staff can be further reminded to stop stamping the blind hole.

[0070] According to some embodiments of the present application, optionally, the stamping die 2 further includes a blank-holding mechanism, and the blank-holding mechanism is connected to the blank-holder plate 21.

[0071] Thus, by setting the blank-holding mechanism to provide a blank-holding force to the blank-holder plate 21, the blank-holder mechanism can accurately control the flow of the material during the forming process, so as to better form the blind hole. Among them, the specific pressure value can be set according to the actual situation. Optionally, the blank-holding mechanism can be a nitrogen spring group or a hydraulic system. In this embodiment, the blank-holding mechanism is a hydraulic system, and the pressure value can be digitally set. By controlling the overflow valve of the hydraulic system (during the material forming process, the flow of the material will be affected by the pressure, so controlling the pressure setting of the overflow valve may directly affect the flow rate and stability of the material), the flow of the material during the forming process can be accurately controlled.

[0072] According to some embodiments of the present application, optionally, the protrusion 151 is a spherical protrusion 151.

[0073] Thus, the spherical protrusion 151 has an arc transition, which can better form the concave part and the convex part on the to-be-processed sheet 3. And the spherical protrusion 151 can also reduce stress concentration.

[0074] According to some embodiments of the present application, optionally, the depth of the protrusion 151 is less than or equal to 1.5P.

[0075] Thus, it is preferably set that the depth of the protrusion 151 is less than or equal to 1.5P, so that the depth of the concave part formed on the to-be-processed sheet 3 is also less than or equal to 1.5P, thereby ensuring that there is enough material storage space reserved for the subsequent process. Among them, P is the part flatness, and P is 0.1 mm to 0.4 mm.

[0076] According to some embodiments of the present application, optionally, the radius of the protrusion 151 is 2t to 3t.

[0077] Thus, according to the actual situation, it is preferably set that the radius of the protrusion 151 is 2t to 3t, so as to ensure that there is enough material storage space reserved for the subsequent process. Among them, t is the material thickness.

[0078] The blind hole stamping method and device can be used for the mounting plate in the new energy vehicle thermal management system. As Figure 9 shown, in this embodiment, the blind hole depth of the 4 mm thick aluminum plate is 2.1 mm, the diameters are 3.8 mm and 4.5 mm respectively, and the flatness P requirement is within 0.3 mm.

[0079] Taking a blind hole with a diameter of 4.5 mm as an example:

[0080] The recessed mold 1 adopts a spherical head groove 121 with a radius of 8 mm, and the pressing depth is 0.4 mm. Reverse forming recess: As Figure 2 shown, place the sheet metal 3 to be processed on the forming punch 15. As Figure 3 shown, the upper slider 11 moves downward along the vertical direction Y to make the forming die 12 press the sheet metal 3 to be processed. As Figure 4 shown, continue to move the upper slider 11 downward along the vertical direction Y. The ejector rod 14 is kept against the forming die 12 under the action of the oil cylinder 13, so that a recessed part and a protruding part are formed on the sheet metal 3 to be processed. At the same time, the positioning punch 17 moves downward along the vertical direction Y with the upper slider 11 to punch a positioning hole 31 on the sheet metal 3 to be processed. Among them, the groove 121 corresponds to the protruding part, and the protrusion 151 corresponds to the protruding part. After that, take out the sheet metal 3 with the recessed part, the protruding part and the positioning hole 31 formed.

[0081] The stamping die 2 adopts a stamping punch 22 with a diameter of 4.5 mm, and the blank holding force of the blank holding mechanism is set to 5 tons. Stamping blind hole: As Figure 5 shown, place the sheet metal 3 with the recessed part, the protruding part and the positioning hole 31 formed on the stamping die 23. As Figure 6 shown, the blank holding mechanism controls the blank holder 21 to move downward along the vertical direction Y until the blank holder 21 presses the above-mentioned sheet metal 3 to be processed. At the same time, the positioning pin 24 is inserted into the positioning hole 31 to play a positioning role. As Figure 7 shown, the stamping punch 22 punches a blind hole in the above-mentioned sheet metal 3 to be processed at a speed of 15 m / min along the vertical direction Y. During this process, the flow of the material during the forming process can be accurately controlled through the blank holding mechanism, so that the material flows toward the recessed part under the action of the stamping punch 22. As Figure 8 shown, the stamping die 2 returns to its original state, and take out the sheet metal with the blind hole punched. Finally, forming inspection: The depth of the blind hole is 2.07 mm, the bottom thickness of the blind hole is 3.03 mm, and the flatness is 0.18 mm.

[0082] It should be noted that although the above-mentioned 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 structural or equivalent process transformations 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 blind hole stamping method, characterized in that, Comprising: Reverse forming depression: Pre-press the to-be-processed sheet by a depression die, a depression part is formed at the bottom of the to-be-processed sheet, the depression part is a reserved material accommodating space, and at the same time, a protruding part is formed at the top of the to-be-processed sheet corresponding to the depression part; Stamping blind hole: Stamp the to-be-processed sheet forming the depression part and the protruding part by a stamping die, during the stamping process, the material flows directionally towards the depression part to form a blind hole.

2. A blind hole stamping device, characterized in that, Comprising: A depression die, the depression die includes an upper slider, a forming female die, an oil cylinder, a ejector rod and a forming male die, the forming female die is installed below the upper slider, the oil cylinder is installed inside the upper slider, the output end of the oil cylinder is connected to the top of the forming female die through the ejector rod, the forming male die is located below the forming female die, a groove is formed on the forming female die, a protrusion is arranged at a position corresponding to the groove on the forming male die, and the forming male die is used for placing the to-be-processed sheet; A stamping die, the stamping die includes a blank holder, a stamping punch and a stamping female die, the stamping punch slides vertically inside the blank holder, and the stamping female die is located below the blank holder.

3. The blind hole stamping device according to claim 2, characterized in that, The depression die further includes an upper cushion plate and a positioning punch, the upper cushion plate is installed below the upper slider, the top of the positioning punch is installed at the bottom of the upper cushion plate, the positioning punch slides vertically inside the forming female die, and a first hole is formed at a position corresponding to the positioning punch on the forming male die; The stamping die further includes a positioning pin, the positioning pin slides vertically inside the blank holder, and a second hole is formed at a position corresponding to the positioning pin on the stamping female die.

4. The blind hole stamping device according to claim 3, characterized in that, The bottom of the positioning pin is arc-shaped.

5. The blind hole stamping device according to claim 2, characterized in that, A placement groove is formed at a position corresponding to the stamping punch on the top of the stamping female die, the stamping die further includes a sensor, the sensor is installed in the placement groove, the sensor is communicatively connected with the stamping machine control system, and the sensor detects the flatness of the to-be-processed sheet placed on the stamping female die.

6. The blind hole stamping device according to claim 5, characterized in that, The stamping die further includes an alarm, and the alarm is communicatively connected with the stamping machine control system.

7. The blind hole stamping device according to claim 2, characterized in that, The stamping die further includes a blank holding mechanism, and the blank holding mechanism is connected with the blank holder.

8. The blind hole stamping device according to claim 2, characterized in that, The protrusion is a spherical protrusion.

9. The blind hole stamping device according to claim 8, characterized in that, The depth of the protrusion is less than or equal to 1.5P.

10. The blind hole stamping device according to claim 8, characterized in that, The radius of the protrusion is 2t to 3t.

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