Heat sink with shielding function for PCB board and its preparation process

Abstract

The present invention relates to the technical field of PCB board heat dissipation, and particularly to a radiator with a shielding function for a PCB board and its preparation process. The preparation process includes the steps of: S101, raw material cutting: cutting 1070 / 1060 aluminum plates into preset sizes and shapes; S102, stamping forming: using a stamping die to perform multiple stampings on the 1070 / 1060 aluminum plates to form a plate-shaped radiator with multiple shielding cavities; performing full pressure after each stamping; S103, trimming; S104, nano-carbon heat dissipation spraying; S105, uniformly setting conductive glue on the arched ribs. The present invention ensures that even very soft aluminum plates can be stamped into shape by monitoring the stamping die and / or the arched ribs formed by stamping in real time during and / or before the stamping process.

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation devices for PCB boards, and in particular to a heat sink with a shielding function for PCB boards and a preparation process thereof. Background Art

[0002] The operation of the chip will generate electromagnetic waves and heat, and the electromagnetic waves will damage other electronic components. In order to avoid and reduce this situation, a shielding cover will be added to the chip to shield the electromagnetic waves and reduce the damage. The heat generated by the operation of the chip will affect the function and life of the chip. In this case, a radiator is needed to dissipate heat. The shielding cover and radiator on the existing electronic equipment are separated separately. Not only must they be produced separately, but they must also be installed separately. When the shielding cover and the radiator are installed separately, the combination of the shielding cover and the radiator is inconvenient, which can easily lead to interference between the structures, resulting in poor contact between the shielding cover and the radiator, affecting the use of the radiator and the shielding cover. At the same time, there is a certain contact area between the shielding cover and the radiator, and the amount of material used increases. Based on this, the prior art proposes a structure that combines the shielding cover and the radiator. However, it still needs to produce the shielding cover and the radiator separately, and then assemble the two together.

[0003] For example, the Chinese utility model patent with announcement number CN209489103U discloses a radiator combining a multifunctional shielding cover and heat dissipation, including a first shielding plate, a second shielding plate, a heat dissipation plate, a mounting hole, a heat dissipation hole, a first chip, a heat dissipation slot, a second chip, a first chip cover and a second chip cover. The first chip cover is fixedly installed on the top of the first chip, and the second chip cover is fixedly installed on the top of the second chip, so as to reduce the electromagnetic waves received by the first chip and the second chip, and complete the protection of the first chip and the second chip. The first shielding plate and the second shielding plate are both fixedly installed on the heat dissipation plate, which reduces the assembly time of the first shielding plate and the second shielding plate. Heat dissipation holes are opened on the heat dissipation plate to complete the heat dissipation of the heat dissipation plate. When too much heat accumulates, the heat is discharged through the heat dissipation slot on one side of the heat dissipation hole. The radiator combines the shielding cover and the radiator by welding, which reduces the thermal resistance generated by the assembly and saves the time cost of assembly.

[0004] The above-mentioned discrete design not only has a cumbersome production process, but also requires mold molding for the chip cover, shielding plate, and heat sink, which has high mold costs and material costs. Secondly, the back-end assembly production is also relatively complicated, from the welding of the flat frame to the heat conduction between the chip and the shielding cover, and then to the heat sink, the entire production process is complicated and cumbersome. Based on this, the prior art has proposed the use of die-casting technology to process the integrated structure of the heat sink and shielding cover.

[0005] For example, the Chinese utility model patent with the publication number CN218941644U discloses a radiator shielding cover integrated structure, a PCBA board, and a 5G terminal device, which includes a radiator and a shielding cover; one side of the radiator is formed into the shielding cover by die-casting; the radiator and the shielding cover are an integrated structure; the shielding cover cooperates with the heat source and is arranged on the periphery of the heat source; multiple heat dissipation fins are arranged on the radiator. By performing die-casting treatment on one side of the radiator to form the shielding cover, the radiator and the shielding cover are integrally formed, avoiding structural interference caused by the separation of the radiator and the shielding cover and affecting the heat dissipation effect. Through the characteristics of the tightly arranged integrated structure, the heat dissipation effect of the radiator is improved.

[0006] However, the cost of die-casting the radiator is very high, mainly reflected in the use of a mold to form after the aluminum alloy is melted, but the cost of the production mold and the subsequent processing costs (such as forming, demolding stamping, drilling and tapping, grinding and polishing, etc.). Secondly, the thermal conductivity of die-cast aluminum alloy or die-cast aluminum is not high (90 - 120w / m.k), and the heat dissipation performance is average.

[0007] In view of this, there is an urgent need for a process with a simpler processing process to prepare a radiator with high heat dissipation performance and integrated shielding and heat dissipation functions. Summary of the Invention

[0008] The purpose of the present invention is to provide a radiator with a shielding function for a PCB board and its preparation process, which partially solves or alleviates the above deficiencies in the prior art. By simplifying the traditional cumbersome preparation process, not only the production process is simple and the cost is lower, but the prepared radiator has a simple structure and better heat dissipation performance.

[0009] In order to solve the above-mentioned technical problems, the present invention specifically adopts the following technical solutions:

[0010] In the first aspect of the present invention, it is to provide a preparation process for a radiator with a shielding function for a PCB board, which includes the steps:

[0011] S101, raw material cutting: Cut the 1070 / 1060 aluminum plate with a thickness of 2.0MM - 2.5MM into a preset size and shape;

[0012] S102, stamping forming: Use a stamping die to perform multiple stampings on the 1070 / 1060 aluminum plate to form a plate-type radiator with multiple shielding cavities; wherein, the stamping speed v is 20 - 30 times per minute; the stamping force is 200 tons - 220 tons; and each stamping is subjected to full pressure when the upper die holder and the lower die holder of the stamping die are fully closed, and then the next stamping is carried out until the preset full pressure time threshold is reached; the preset full pressure time threshold is 2 - 3s;

[0013] S103, Trimming: Remove the excess burrs to ensure that the edges of the product are smooth;

[0014] S104, Nano-carbon heat dissipation spraying: Spray a nano-carbon heat dissipation coating on the outer side of the radiator;

[0015] S105, Uniformly apply conductive adhesive on the arched ribs obtained by stamping for contacting and conducting with the exposed copper surface reserved on the bottom surface of the PCB board, and then heat it to cure, so that when the plate-type radiator is installed on the PCB board, a closed shielding cavity is formed between the shielding cavity and the bottom plate of the PCB board; wherein, the highest temperature during the curing process of the conductive adhesive by heating is 150°C, and it is heated at the highest temperature for 30 minutes; wherein, a plurality of shielding cover forming areas are provided on the lower die base, and a plurality of rib protrusions are enclosed at the edge of each shielding cover forming area, and a punching groove that can cooperate with the rib protrusion is provided at the bottom of the upper die base corresponding to each rib protrusion;

[0016] Among them, after the first stamping and before the second stamping in step S102, the following steps are further included:

[0017] S301, Obtain the scanned image of the aluminum plate after the first stamping by using a scanning device to scan the aluminum plate;

[0018] S302, Perform image analysis on the scanned image to determine whether the arched ribs corresponding to the same shielding cover forming area on the aluminum plate are deformed. If not deformed, execute step S303; if only grade I deformation occurs, execute step S307; if any arched rib has grade III deformation, execute step S305; if only grade II deformation occurs and the proportion K1 of all the arched ribs with grade II deformation on the aluminum plate is less than or equal to the first preset proportion threshold K01, execute step S306; if both grade I deformation and grade II deformation occur and the proportion K3 of the sum of all the arched ribs with grade I deformation and the arched ribs with grade II deformation on the aluminum plate is less than the third preset proportion threshold K03, and the proportion K4 of the arched ribs with grade I deformation is less than the fifth preset proportion threshold K05, execute step S306; if K3≥K03, execute step S305; if K3<K03, but K4>K05, execute step S308; S303, Perform the next stamping until the stamping is completed, and execute step S103;

[0019] S304, Reduce the deceleration gradient and execute step S303;

[0020] S305, Stop stamping and notify to replace the aluminum plate;

[0021] S306, Stop stamping and conduct manual verification;

[0022] S307. Determine whether the positions of the arched ribs with grade I deformation correspond one by one to the positions of the raised ribs with grade I deformation on the lower die base pre-recorded in step S206. If so, execute step S304; otherwise, execute step S308.

[0023] S308. Determine whether there are shared arched ribs among the deformed arched ribs, or whether two adjacent arched ribs are deformed simultaneously. If so, execute step S306; otherwise, execute step S304.

[0024] In some embodiments, if it is preset to stamp 3 times, before executing step S301, the following steps are further included:

[0025] Obtain a scanned image of the aluminum plate after the first stamping by scanning the aluminum plate with a scanning device.

[0026] Perform image analysis on the scanned image to obtain the actual height of each arched rib.

[0027] Determine whether the actual height of each arched rib reaches a preset first height.

[0028] If the proportion P1 of the arched ribs whose actual height does not reach the first height is less than the first preset non-compliance threshold, execute steps S301 - S307.

[0029] If the proportion P1 of the arched ribs whose actual height does not reach the first height is greater than or equal to the first preset non-compliance threshold, prompt to adjust the stamping force and / or stamping speed.

[0030] In some embodiments, in step S102, it is stamped 3 times, and during the 3 - time stamping process, gradient deceleration is used for stamping. Specifically, it includes the following steps:

[0031] S1021. During the first stamping, stamp at the first stamping speed V1, and keep the pressure for 2 - 3 s after stamping; where V1 = 200 mm / s.

[0032] S1022. During the second stamping, stamp at the second stamping speed V2, and keep the pressure for 2 - 3 s after stamping; where V2 = 150 mm / s.

[0033] S1023. During the third stamping, stamp at the third stamping speed V3, and after keeping the pressure for 2 - 3 s, control the upper die base to leave the lower die base at a preset return speed; where V3 = 100 mm / s.

[0034] In some embodiments, when the number of stampings in step S102 is greater than 3, gradient deceleration is used for stamping, and before the last two stampings, the following steps are further included:

[0035] S401. Use a scanning device to scan the aluminum plate to obtain a scanned image of the aluminum plate after the previous stamping.

[0036] S402. Perform image analysis on the scanned image to obtain the actual height of each of the arched ribs.

[0037] S403. Determine whether the actual height of each of the arched ribs reaches the preset height threshold corresponding to the current stamping. If the proportion P1 of the arched ribs whose actual height reaches the corresponding preset height threshold is greater than or equal to the first preset compliance threshold, execute step S404. If the proportion P1 of the arched ribs whose actual height reaches the corresponding preset height threshold is less than the first preset compliance threshold, and it is pre-judged that a grade-I deformation occurs in the rib protrusions in the lower die base before stamping, execute step S405.

[0038] S404. Control the mold to perform the next stamping, and execute steps S301 - S308.

[0039] S405. Perform image analysis based on the scanned image in step S401 to identify whether the arched ribs on the aluminum plate are deformed. If none of them are deformed, execute step S404. If only a grade-I deformation occurs and the arched ribs with grade-I deformation do not include the shared arched ribs, execute step S406. If any of the arched ribs undergoes a grade-III deformation, execute step S407. If only a grade-II deformation occurs and the proportion K1' of the rib protrusions with grade-II deformation is greater than the first preset proportion threshold K01', execute step S408. If both a grade-I deformation and a grade-II deformation occur, where the proportion K3' of the sum of the arched ribs with grade-I deformation and the arched ribs with grade-II deformation is less than the third preset proportion threshold K03', and the proportion K4' of the arched ribs with grade-I deformation is less than the fifth preset proportion threshold K05', execute step S408. If K3' > K03', execute step S407. If K3' < K03', but K4' > K05', and there are no shared arched ribs among the deformed arched ribs, execute step S406.

[0040] S406. Reduce the deceleration gradient and execute step S404.

[0041] S407. Stop stamping and notify to replace the aluminum plate.

[0042] S408. Stop stamping and notify for manual verification.

[0043] In some embodiments, the deceleration gradient α can be determined by the following formula:

[0044] ;

[0045] Wherein, N is the number of stamping times, t is the actual material thickness of the 1070 / 1060 aluminum plate; t0 is the reference material thickness of the 1070 / 1060 aluminum plate, and its value is 2 mm; α0 is the initial deceleration gradient, which is an empirical value; k N is the attenuation coefficient of the 1070 / 1060 aluminum plate and the mold; k t is the sensitivity of the thickness of the 1070 / 1060 aluminum plate to the deceleration gradient.

[0046] In some embodiments, before step S102, the method further includes the steps of:

[0047] S201, scanning the lower die base by using a scanning device to obtain a scanned image of the lower die base;

[0048] S202, performing image analysis on the scanned image to obtain the deformation level of each rib protrusion on the lower die base and the proportion of the deformed rib protrusions;

[0049] If any rib protrusion undergoes a level III deformation, step S203 is executed;

[0050] If no rib protrusion undergoes a level III deformation, but at least one rib protrusion around any shielding cover forming area undergoes deformation, step S204 or S205 is executed;

[0051] S203, notifying to replace the lower die base;

[0052] S204, if two adjacent rib protrusions around any shielding cover forming area undergo deformation, and one of the rib protrusions is a level II deformation, or both are level I deformations, notifying to perform maintenance or replace the mold;

[0053] S205, if only one rib protrusion around any shielding cover forming area undergoes a level I deformation, determining whether the deformed rib protrusion is a common rib protrusion. If so, notifying to replace the mold; otherwise, step S206 is executed;

[0054] S206, recording the position information of the rib protrusion with a level I deformation, and executing step S102.

[0055] In some embodiments, the rib protrusion undergoing a level III deformation includes that the angle between the axial direction of the rib protrusion and the direction perpendicular to the upper surface of the lower die base is greater than 10°.

[0056] In some embodiments, the rib protrusion undergoing a level II deformation includes that the angle between the axial direction of the rib protrusion and the direction perpendicular to the upper surface of the lower die base is <10°, but greater than 2°.

[0057] In some embodiments, when the rib protrusion undergoes a Class-I deformation, the included angle between the axis of the rib protrusion and the direction perpendicular to the upper surface of the lower die base is less than 2° but greater than 0°.

[0058] In some embodiments, before performing step S307, the following steps are further included: when it is determined in step S302 that a Class-I deformation occurs, determine whether the positions of the arched rib bars that have undergone a Class-I deformation correspond one by one to the positions of the rib protrusions that have undergone a Class-I deformation recorded in step S206. If so, perform step S304; otherwise, perform step S307.

[0059] In a second aspect of the present invention, there is provided a heat sink with a shielding function for a PCB board, which is prepared by using the preparation process of the heat sink with a shielding function for a PCB board as described above. It includes a heat dissipation body, at least one shielding cover arranged on the heat dissipation body and a shielding frame around it. A nano-carbon heat dissipation coating is arranged on the outer side surface of the heat dissipation body; wherein, the shielding frame is formed by enclosing at least one arched rib bar formed by stamping. Each arched rib bar is provided with a conductive adhesive that can contact and conduct with the exposed copper surface reserved on the bottom surface of the PCB board, and the conductive adhesive has undergone a curing treatment; and at least two shielding frames share one arched rib bar.

[0060] Beneficial effects: Aluminum is a non-magnetic material with a magnetic permeability close to that of a vacuum (μr≈1). Although aluminum has a good shielding effect on high-frequency electromagnetic waves, its shielding effect on low-frequency magnetic fields (such as 50Hz power frequency interference) is limited. 1070 or 1060 aluminum plates have very good heat dissipation performance, but their elastic modulus is relatively low, that is, they are relatively soft and are not easily formed by die-casting processes. Even stamping processes are not easily formed because of their low strength (tensile strength is about 60-95MPa) and low hardness, resulting in easy local deformation or tearing during stamping and difficulty in maintaining shape stability. However, they have good ductility (elongation is about 30-40%), and are prone to wrinkling, depression or local thinning during over-stretching in stamping. That is, they are very easy to break and / or deform during the processing. Therefore, 1070 or 1060 aluminum is not usually used in the art to make heat sinks or shielding covers, but more often aluminum alloys are used. For example, in the prior art CN218941644U, during the process of preparing a shielding cover with an integrated heat dissipation structure by die-casting, the aluminum alloy is heated and melted, and then the melted aluminum alloy is injected into the mold cavity under high pressure. After cooling and solidifying in the mold, an extruded aluminum alloy strip is formed, and a heat sink with heat dissipation fins can be formed through post-processing. However, the heat sink prepared by the die-casting process has low heat dissipation performance, and the cost of die-cast heat sinks is high.

[0061] In view of this, the present application proposes a process for preparing a radiator with shielding function using 1070 or 1060 aluminum. Specifically, by means of multiple stamping and in combination with a decreasing stamping speed, arched ribs are gradually formed on the 1070 or 1060 aluminum plate, and a shielding frame is formed by enclosing multiple arched ribs. And a conductive adhesive, such as a nickel-carbon rubber strip, is coated on the arched ribs, so as to prepare a radiator that can be used for signal shielding. By gradually forming through multiple stamping, the amount of deformation per single stamping is reduced, thus ensuring the forming.

[0062] Further, in order to ensure the shielding performance, the mold is scanned before stamping, so as to identify whether the rib protrusions on the mold are deformed based on the scanned image. If serious deformation occurs, it is notified to replace the mold, thus avoiding the inability to form a shielding cover with shielding effect due to serious deformation of the rib protrusions. Even further, before and / or after each stamping, the formed arched ribs are scanned to judge whether the formed arched ribs on the aluminum plate are deformed. If deformation occurs, timely adjustment is made or it is prompted to replace the aluminum plate (i.e., the forming fails). That is to say, the core lies in ensuring no deformation or minor deformation during the stamping forming process through a detection mechanism, thus ensuring the product forming, that is, solving the problem in the prior art that it is impossible to stamp 1060 / 1070 aluminum plates by stamping process to obtain a radiator with shielding function.

[0063] The radiator of the present application can reach a heat dissipation performance of 220 W / m·K horizontally and 270 W / M·K vertically, which is much higher than the thermal conductivity of 90 - 120 W / m·K of the radiator with heat dissipation fins prepared by traditional die casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts do not necessarily draw according to the actual scale. Obviously, the following described drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0065] Figure 1 It is a flowchart of an embodiment of a preparation process of a radiator with shielding function for a PBC board of the present invention;

[0066] Figure 2 It is a flowchart of an embodiment of identifying whether the rib protrusions on the lower die base are deformed in the present invention;

[0067] Figure 3Flow chart of an embodiment for identifying whether the arched ribs formed by stamping on the aluminum plate are deformed in the present invention;

[0068] Figure 4 Flow chart of another embodiment for identifying whether the arched ribs formed by stamping on the aluminum plate are deformed in the present invention;

[0069] Figure 5 Schematic diagram of the distribution of the rib protrusions on the lower die base used in the preparation process of the present invention;

[0070] Figure 6 Top view of the radiator prepared by the preparation process of the present invention;

[0071] Figure 7 To reflect Figure 6 Connection relationship diagram of the six sides of the hexagonal shielding frame in the shown radiator;

[0072] Figure 8 To reflect Figure 6 Schematic diagram of the side of the radiator in;

[0073] Figure 9 Physical photo of a radiator prepared by using the preparation process of the present invention. The arrow in the figure indicates the arched ribs formed by the stamping process (with conductive glue coated on its surface);

[0074] Figure 10 Model diagram of another radiator prepared by using the preparation process of the present invention.

[0075] Summary of reference numeral identifications: 100, lower die base; 101, shielding cover forming area; 102, rib protrusion; 200, heat dissipation body; 201, shielding frame; 202, shielding cover; 201-1, arched rib. Detailed implementation manners

[0076] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0077] In this article, suffixes such as "module", "component" or "unit" used to represent elements are only for the convenience of the description of the present invention, and they have no specific meaning in themselves. Therefore, "module", "component" or "unit" can be used interchangeably.

[0078] In this text, the orientation or positional relationships indicated by terms such as "upper", "lower", "inner", "outer", "front", "rear", "one end", "the other end", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0079] In this text, unless otherwise clearly specified and defined, terms such as "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0080] In this text, "and / or" includes any and all combinations of one or more of the listed related items.

[0081] In this text, "a plurality of" means two or more, that is, it includes two, three, four, five, etc.

[0082] As used in this specification, the term "about" typically represents + / - 5% of the value, more typically + / - 4% of the value, more typically + / - 3% of the value, more typically + / - 2% of the value, even more typically + / - 1% of the value, and even more typically + / - 0.5% of the value.

[0083] In this specification, certain embodiments may be disclosed in a format within a certain range. It should be understood that this kind of description "within a certain range" is only for convenience and brevity, and should not be construed as a rigid limitation on the disclosed range. Therefore, the description of the range should be considered to have specifically disclosed all possible sub-ranges and the individual numerical values within this range. For example, the description of the range 1 - 6 should be regarded as having specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as the individual numbers within this range, such as 1, 2, 3, 4, 5, and 6. The above rules apply regardless of the breadth of the range.

[0084] Example 1: Refer to Figure 1 , which is a flowchart of the preparation process of a heat sink with shielding function for a PCB board according to an embodiment of the present invention. Specifically, the preparation process of this embodiment specifically includes the steps:

[0085] S101, Raw material cutting: Cut the 1070 / 1060 aluminum plate with a thickness of h into a preset size and shape.

[0086] In some embodiments, the thickness h of the 1070 / 1060 aluminum plate is 2.0MM - 2.5MM.

[0087] In some embodiments, the above aluminum plate can also be an aluminum strip.

[0088] S102, Stamping and forming: Use a stamping die to stamp the cut 1070 / 1060 aluminum plate multiple times to form a plate - type radiator with multiple shielding cavities.

[0089] In some embodiments, during each stamping, when the upper die base and the lower die base of the stamping die are fully closed, full pressure is applied until reaching a preset full - pressure time threshold, and then the next stamping is carried out; the preset full - pressure time threshold is 2 - 3s. By applying full pressure, the aluminum plate after high - speed stamping is prevented from rebounding and deforming.

[0090] In some embodiments, the die gap H = 8% - 12%h, preferably 8%; the stamping speed v is 20 - 30 times per minute; the stamping force is 200 tons - 220 tons. Preferably, 200 tons.

[0091] In some embodiments, multiple shielding cover forming areas 101 are provided on the lower die base 100, and multiple rib protrusions 102 are enclosed at the edge of each shielding cover forming area 101. An impact groove that can cooperate with the rib protrusion 102 is provided at the bottom of the upper die base corresponding to each rib protrusion 102.

[0092] When the upper die base makes the first stamping on the lower die base, under the action of the rib protrusion 102, multiple arched ribs with a first height are formed on the aluminum plate.

[0093] When the upper die base makes the second stamping on the lower die base, under the action of the rib protrusion 102, the height of the arched rib changes from the first height to a second height; the second height is greater than the first height. After multiple stampings like this until the height of the arched rib reaches the target height, multiple arched ribs enclose and form a shielding frame 201 integrally formed with the aluminum plate, and a shielding cover 202 corresponding to the shielding cover forming area is integrally formed within the shielding frame 201.

[0094] Due to the low strength (tensile strength is about 60 - 95 MPa) and low hardness of 1070 aluminum, it is prone to local deformation or tearing during stamping, making it difficult to maintain shape stability; and its high plasticity will cause the material to be over-stretched during stamping, and it is likely to become thinner and lead to tearing or disconnection. Therefore, in this embodiment, the method of multiple stamping is adopted to gradually form, that is, by controlling the stamping speed to control the amount formed by each arching to avoid or reduce the risk of fracture, so as to ensure the formation of the arched rib.

[0095] Preferably, in step S102, stamping is performed 3 times, and the stamping is carried out in a gradient deceleration manner during the 3 - time stamping process. Specifically, it includes the steps:

[0096] S1021, during the first stamping, stamping is carried out at the first stamping speed V1, and after stamping, it is kept pressurized for 2 - 3 s; where V1 = 200 mm / s.

[0097] S1022, during the second stamping, stamping is carried out at the second stamping speed V2, and after stamping, it is kept pressurized for 2 - 3 s; where V2 = 150 mm / s.

[0098] S1023, during the third stamping, stamping is carried out at the third stamping speed V3, and after stamping and keeping pressurized for 2 - 3 s, the upper die holder is controlled to leave the lower die holder at a preset return speed; where V3 = 100 mm / s.

[0099] In some other embodiments, when the number of stampings is greater than 3, the stamping is carried out in a gradient deceleration manner, and the deceleration gradient α for each stamping can be determined by the following formula:

[0100] ; where N is the number of stampings, t is the actual material thickness of the 1070 / 1060 aluminum plate; t0 is the reference material thickness of the 1070 / 1060 aluminum plate, and its value is 2 mm; α0 is the initial deceleration gradient, which is an empirical value; k N is the attenuation coefficient of the 1070 / 1060 aluminum plate and the mold; k t is the sensitivity of the 1070 / 1060 aluminum plate thickness to the deceleration gradient.

[0101] S103, trimming: Remove the excess burrs to ensure that the product edge is smooth.

[0102] S104, nano-carbon heat dissipation spraying: Spray a nano-carbon heat dissipation coating on the outer side of the radiator.

[0103] S105, uniformly arrange nickel-carbon rubber strips on the arched rib for contacting and conducting with the exposed copper surface reserved on the bottom surface of the PCB board, and then heat it to cure it, so that when the radiator is installed on the PCB board, a closed shielding cavity is formed between the shielding cover and the bottom plate of the PCB board.

[0104] In some embodiments, in addition to the nickel-carbon rubber strip, other conductive rubber strips may be provided on the arched rib strips.

[0105] Preferably, the highest temperature region during the gradual heating of the nickel-carbon rubber strip is 150 °C, and it is heated at the highest temperature region for 30 min.

[0106] In this embodiment, the aluminum plate is stamped by means of multiple stamping operations, and a full pressure is applied after each stamping operation. At the same time, a gradient decreasing method is adopted, so as to avoid the problem that the periphery of the arched rib strip formed during the stamping process is prone to fracture due to the softness of the aluminum plate, or the problem that it is not easy to be formed or deformed due to springback after stamping.

[0107] Embodiment 2: Since 1070 aluminum and 1060 aluminum are very soft, during the stamping process, the rib protrusions are mainly used to stamp the aluminum plate multiple times to form arched rib strips that are slender and have an n-shaped cross-section. Therefore, whether the rib protrusions are deformed will be the key to the successful forming of the arched rib strips. Therefore, in order to ensure that the arched rib strips do not break or deform during the forming process (for example, the lengths or thicknesses of the two arched sides deviate greatly), before stamping, the rib protrusions on the lower die base are also identified to determine whether they are deformed.

[0108] Generally, if a large deformation occurs, for example, fracture or large defects, or the axial direction of the rib protrusion is inclined at a large angle (that is, the axial direction of its protrusion is not perpendicular to the upper surface of the lower die base), it can be recognized by the naked eye of a person. In this case, the mold will be replaced or maintained before stamping. However, the maintenance is not real-time, but periodic, and there are always omissions in manual operations. Moreover, since the height of the arched rib strips formed on the aluminum plate is not high, correspondingly, the rib protrusions on the mold are not high either. Therefore, if its axial direction is not inclined at a large angle, for example, the included angle between the axial direction of the protrusion and the direction perpendicular to the upper surface of the lower die base is less than 10° (that is, compared with the direction perpendicular to the upper surface of the lower die base, the axis of the rib protrusion has a slight inclination), then this kind of deformation is usually difficult to be quickly and clearly recognized by the naked eye. In addition, since the shielding frame is formed by enclosing multiple arched rib strips, if a single arched rib strip is deformed, it may affect the two arched rib strips connected to it. Therefore, in order to ensure the forming of a single arched rib strip and at the same time to ensure the forming of the shielding frame formed by enclosing multiple arched rib strips connected to each other, the present invention also provides another preparation process, which scans the lower die base by means of a scanning device before stamping, so as to obtain a scanning image including each rib protrusion on the lower die base, and then the deformation of the rib protrusions on the lower die base can be quickly recognized according to this scanning image.

[0109] Specifically, this embodiment includes each step in Embodiment 1 above. The difference is that before step S102 in the preparation process of this embodiment, the following steps are further included:

[0110] S201, scanning the lower die base using a scanning device to obtain a scanned image of the lower die base;

[0111] S202, performing image analysis on the scanned image to obtain the deformation level of each rib protrusion on the lower die base and the proportion of deformed rib protrusions;

[0112] If any rib protrusion undergoes a grade III deformation, notify to replace the lower die base;

[0113] If only a grade II deformation occurs and the proportion K1 of the rib protrusions with grade II deformation is less than or equal to the first preset proportion threshold K01, notify for maintenance; if it is greater than the first preset proportion threshold K01 and less than the second preset proportion threshold K02, notify to replace the lower die base;

[0114] If only a grade I deformation occurs and the proportion K2 of the rib protrusions with grade I deformation is less than the third preset proportion threshold K03, execute step S102; if it is greater than the third preset proportion threshold K03, notify for maintenance;

[0115] If both grade I deformation and grade II deformation occur and the proportion K1 of the rib protrusions with grade II deformation is less than or equal to the fourth preset proportion threshold K04, K04 < K01; where

[0116] If the ratio K3 between the rib protrusions with grade I deformation and the rib protrusions with grade II deformation is greater than the first preset ratio threshold, execute step S102;

[0117] If the ratio K3 between the rib protrusions with grade I deformation and the rib protrusions with grade II deformation is equal to the first preset ratio threshold, notify for maintenance;

[0118] If the ratio K3 between the rib protrusions with grade I deformation and the rib protrusions with grade II deformation is less than the first preset ratio threshold, notify to replace the lower die base.

[0119] In some embodiments, the control module in the stamping process control system can communicate with the scanning device for data, and the control module performs image analysis on the scanned image to obtain the analysis result, and through the display of corresponding notifications such as a display screen, or send the above various notifications to the user terminals of the pre-associated users, such as mobile terminals.

[0120] In this embodiment, the deformation of the rib protrusion refers to the axial deviation of the rib protrusion, or the occurrence of breakage, defect, etc. Among them, the occurrence of breakage or defect, or the axial deviation angle of the rib protrusion being greater than 10° (that is, the angle between the axis of the rib protrusion and the direction perpendicular to the upper surface of the lower die base is greater than 10°) is a Class III deformation, which is also the most serious deformation. Once a Class III deformation occurs, during the stamping process, the formed arched rib is prone to breakage or defect, etc., resulting in the ultimate inability to form a shielding frame with a shielding effect. Therefore, once this situation is detected, it is necessary to remind to replace the mold. If the axial deviation angle of the rib protrusion is greater than 2° but less than 10°, it is a Class II deformation. During the stamping process, even if a small part undergoes a Class II deformation, since the arched ribs are not formed separately, but multiple arched ribs need to enclose to form a shielding frame, as long as one undergoes a Class II deformation, it may cause the shielding frame to not be formed, or not fit well with the PCB board, thus unable to shield well. However, if only a small amount of Class II deformations occur, it can be corrected by maintenance and immediately positioning the rib protrusion. If a large number of Class II deformations occur, then the maintenance cost is high, and even with maintenance, it cannot be guaranteed that all rib protrusions can be well reset. Therefore, if only a small amount (for example, only one Class II deformation occurs around each shielding cover forming area, or only one Class II deformation occurs around some shielding cover forming areas while others do not; or one rib protrusion shared by two shielding cover forming areas undergoes a Class II deformation), notify for maintenance, and once it is found that the proportion of rib protrusions with Class II deformations is relatively large (for example, at least two Class II deformations occur around each shielding cover forming area, or two adjacent Class II deformations occur around some shielding cover forming areas; or one rib protrusion shared by two shielding cover forming areas undergoes a Class II deformation), then notify for replacement. If the axial deviation angle of the rib protrusion is greater than 0° but less than 2°, it is a Class I deformation. During the stamping process, if a small amount of Class I deformations occur (for example, only 1 or only one Class I deformation occurs around some shielding cover forming areas), it can be corrected under the combined action of the gradient-decreasing stamping method and punching, as well as subsequent processes (such as positioning while trimming the edge). Therefore, stamping can be directly carried out. However, if a large number of Class I deformations occur (for example, at least two Class I deformations occur around each shielding cover forming area, or two adjacent Class I deformations occur around some shielding cover forming areas; or one rib protrusion shared by two shielding cover forming areas undergoes a Class I deformation), it is necessary to notify for maintenance or even directly replace the mold.

[0121] Of course, in this embodiment, monitoring is not only carried out a few minutes before stamping. Periodic detection can also be performed to predict the deformation trend based on the monitoring results, and then maintenance can be carried out in advance to extend the service life of the mold. For example, by performing monitoring periodically and analyzing the monitoring results (such as scanned images). For example, with the monitoring time as the abscissa and the offset angle as the ordinate, a circumferential offset angle change trend curve of the rib protrusion is plotted. If it is found that the offset angle has a tendency to increase (for example, when the offset is relatively large and is about to reach 2°), maintenance is notified.

[0122] Embodiment 3: The present invention also provides another preparation process. Before stamping, a scanning device is used to scan the lower die to obtain a scanned image including each rib protrusion on the lower die, and then whether the rib protrusions on the lower die are deformed can be quickly identified based on this scanned image. Specifically, it includes each step in Embodiment 1 above. The difference is that, see Figure 2 , before step S102 in the preparation process of this embodiment, the following step is further included:

[0123] S201, scanning the lower die base with a scanning device to obtain a scanned image of the lower die base.

[0124] In some embodiments, the scanning device can be a high-definition camera device. Of course, other scanning devices can also be used, such as infrared scanning devices and laser scanning devices. Of course, to reduce costs, a high-definition camera or an infrared scanning device is preferably used.

[0125] S202, performing image analysis on the scanned image to obtain the deformation level of each rib protrusion on the lower die base. If any rib protrusion undergoes a level III deformation, step S203 is executed; if no rib protrusion undergoes a level III deformation, but at least one rib protrusion around any shielding cover forming area is deformed, step S204 or S205 is executed. Of course, if no rib protrusion is deformed, step S102 is executed.

[0126] In this embodiment, the deformation of the rib protrusion refers to the axial offset of the rib protrusion, or the occurrence of breakage, defect, etc. Among them, the occurrence of breakage or defect, and the axial offset angle of the rib protrusion being greater than 10° (that is, the angle between the axis of the rib protrusion and the direction perpendicular to the upper surface of the lower die base is greater than 10°) is a level III deformation, that is, the most serious deformation. If the axial offset angle of the rib protrusion is greater than 2° but less than 10°, it is a level II deformation. If the axial offset angle of the rib protrusion is greater than 0° but less than 2°, it is a level I deformation.

[0127] S203, notify to replace the lower die base.

[0128] If the rib protrusion is broken or damaged, then the height of some of the finally formed arched ribs will not reach the required level. As a result, when the shielding frame is installed on the PCB board, there will be leakage windows, that is, the formed arched ribs are also defective and do not meet the requirements. Therefore, in this case, the mold must be replaced.

[0129] If the axial offset angle of the rib protrusion is greater than 10°, then there will be cracks or disconnections between it and the two adjacent rib protrusions, thus preventing the formation of a closed shielding frame formed by connecting multiple arched ribs end to end. And for the arched ribs formed by the deformed rib protrusion, after multiple stamping operations, the lengths and thicknesses of the two sides of the n-shaped arched ribs will be uneven. Even the part between one side or both sides may break due to being too thin or insufficient aluminum replenishment during the stamping process.

[0130] S204, if two adjacent rib protrusions are deformed, and one of the rib protrusions is a level-II deformation, or both are level-I deformations, execute step S203.

[0131] Since each shielding frame is formed by multiple arched ribs surrounding the shielding cover, if two adjacent rib protrusions around any shielding cover forming area are deformed, and one of them is a level-II deformation, then during the stamping process, not only will the corresponding arched rib be deformed accordingly, but it may even cause the arched ribs connected to these two adjacent arched ribs to also undergo slight deformations, such as level-I deformations. As a result, the finally formed shielding frame may not fit well with the PCB board, thereby reducing the shielding effect. Therefore, it is necessary to notify to replace the mold. Similarly, if two adjacent rib protrusions are deformed at level-I, then during the stamping process, not only will the corresponding arched rib be deformed at level-I, but it may even cause the arched ribs connected to these two adjacent arched ribs to also undergo slight deformations. Therefore, it is necessary to notify for maintenance.

[0132] Of course, if there is no level-III deformation of any rib protrusion, but at least two rib protrusions around any shielding cover forming area are deformed and these two are not adjacent. Although the two detected deformed rib protrusions are not adjacent, as mentioned above, since multiple arched ribs are connected, even if the two deformed rib protrusions have not undergone deformation, during the stamping process, in addition to the arched ribs corresponding to these two rib protrusions being deformed, those connected to these two arched ribs will also be deformed. Therefore, when at least two non-adjacent rib protrusions are detected to be deformed, it will directly notify to replace the mold.

[0133] S205, if only one rib protrusion is deformed at level-I, determine whether the deformed rib protrusion is a common rib protrusion. If so, execute step S203; otherwise, execute step S206.

[0134] S206, record the position information of the rib protrusion, and execute step S102.

[0135] If among multiple rib protrusions in the same shielding cover forming area, only one rib protrusion has an axial offset angle less than 2°, after multiple stampings, the lengths and thicknesses of the two sides of the formed n-shaped arched rib may also be uneven. However, since the height of the arched rib is not very high, the difference between the two sides is not significant. Therefore, it will not break, and the formed arched rib has sufficient strength. But it will affect other arched ribs, especially the two arched ribs connected to it. Therefore, it needs to be marked so that in the subsequent step of applying conductive glue, more conductive glue can be coated on the corresponding arched rib and the arched ribs connected to it to compensate for the error caused by the axial offset of the arched rib. However, if the rib protrusion is a shared rib protrusion shared by two or more shielding cover forming areas, although it will not break, due to too many other rib protrusions connected to it, see Figure 10 , so, even if only one rib protrusion undergoes a Class I deformation, as long as it is a shared rib protrusion, in order to ensure the quality of the final forming, the mold needs to be replaced.

[0136] However, if multiple rib protrusions in the same shielding cover forming area undergo deformation, and one of them is a Class II deformation, although it can also be compensated to a certain extent by applying conductive glue, this will increase the workload. And once multiple rib protrusions deform simultaneously (especially at least two adjacent rib protrusions deform), during multiple stampings, the probability of the arched rib breaking or deforming greatly increases, and the stability and shielding performance of the finally formed shielding frame cannot be guaranteed. Therefore, either the mold needs to be replaced or maintenance needs to be carried out (to reduce the axial offset angle).

[0137] Embodiment 4: The present invention also provides another preparation process, which includes each step in Embodiment 2. The difference is that in this embodiment, when stamping 3 times, before the second stamping in step S102, the following steps are also included:

[0138] Use a scanning device to scan the aluminum plate to obtain a scanned image of the aluminum plate after the first stamping;

[0139] Perform image analysis on the scanned image to obtain the actual height of each arched rib;

[0140] Judge whether the actual height of each arched rib reaches the preset first height (preferably, the actual height reaching the first height means that the difference between the two is less than the preset difference threshold);

[0141] If the proportion P1 of the arched rib strips whose actual height does not reach the first height is less than the first preset non-compliance threshold, control the mold to perform a second stamping;

[0142] If the proportion P1 of the arched rib strips whose actual height does not reach the first height is greater than or equal to the first preset non-compliance threshold, trigger the scanning device to scan the lower die base to obtain a scanned image of the lower die base;

[0143] Perform image analysis based on the scanned image to identify whether the rib protrusions on the lower die base are deformed,

[0144] If no deformation occurs, or only grade I deformation occurs, and the proportion K2 of the rib protrusions with grade I deformation is less than the third preset proportion threshold K03, control the mold to perform a second stamping and reduce the deceleration gradient;

[0145] If any rib protrusion has grade III deformation, notify to replace the lower die base;

[0146] If only grade II deformation occurs, and the proportion K1 of the rib protrusions with grade II deformation is less than or equal to the first preset proportion threshold K01, stop stamping and notify for maintenance;

[0147] If both grade I deformation and grade II deformation occur simultaneously, and the proportion K1 of the rib protrusions with grade II deformation is less than or equal to the fourth preset proportion threshold K04, where the proportion K3 of the sum of the rib protrusions with grade I deformation and the rib protrusions with grade II deformation is less than the third preset proportion threshold, stop stamping and notify for maintenance; if it is greater than the third preset proportion threshold, notify to replace the lower die base.

[0148] Since three stampings are adopted, and the speed of the first stamping is the maximum, the height of the arched rib strips formed by the first stamping is the most obvious. Therefore, once it is monitored that the arched rib strips obtained after the first stamping do not meet the expectations (for example, the proportion P1 of the arched rib strips whose actual height does not reach the first height is greater than or equal to the first preset non-compliance threshold), it means that the rib protrusions on the lower die base may be deformed, resulting in failure to meet the expectations. Therefore, if the lower die is not detected before stamping, the lower die base can be detected after the first stamping. This is applicable to the scenario where the daily maintenance of the lower die is in place. Of course, it is also possible to perform detections before and after the first stamping. After the first stamping, the aluminum plate can be moved away using a flat plate tool, and then the scanning detection can be carried out.

[0149] Of course, in some other embodiments, if the proportion P1 of the arched ribs whose actual height does not reach the first height is less than the first preset non-compliance threshold, the scanning device is triggered to scan the scanned image of the arched ribs formed on the aluminum plate after the first stamping, and image analysis is performed to determine whether the arched ribs obtained by stamping are deformed. Specifically, refer to steps S301 - S307 in Embodiment 5. If there is no deformation or only a small amount of slight deformation (such as Grade I deformation) occurs, stamping can continue. If the actual height does not reach, it indicates that the stamping force or stamping speed does not reach the required level.

[0150] Embodiment Five: The present invention also provides another preparation process, which includes each step in Embodiment Two or Four. The difference is that in this embodiment, when stamping three times, after the first stamping in step S102, the following steps are further included:

[0151] S301, Use a scanning device to scan the aluminum plate to obtain a scanned image of the aluminum plate after stamping.

[0152] As mentioned above, since the cost of replacing the mold is very high, therefore, for some cases where the rib protrusions are deformed even if they occur, maintenance or subsequent processes can be used to make up for or correct them, rather than directly replacing the mold. Therefore, in order to ensure the formation of the shielding frame (for example, the heads and tails of multiple arched ribs are connected, and they will not break apart from each other, and they can play a shielding role when installed on the PCB board), in this embodiment, it is necessary to determine whether the arched ribs after stamping are deformed.

[0153] Since 1070 aluminum or 1060 aluminum is relatively soft, and there may be some rib protrusions with Grade I or Grade II deformation, which may cause the currently formed arched ribs to be deformed after each stamping. Therefore, scanning can be performed after each stamping to determine whether the arched ribs are deformed. Once it is determined that there is deformation, corresponding prompts or notifications are immediately given. However, if judgments are made every time, it will inevitably increase the data processing volume of the system, thereby increasing the system power consumption and cost. Moreover, since the height of the arched ribs is not high, the speeds of the subsequent two stampings are gradually decreasing. Therefore, only the change of the arched ribs after the first stamping is obvious, and the change of the arched ribs after the subsequent two stampings is not obvious. Therefore, preferably, the detection is only performed when the initial shape is obtained after the first stamping. Of course, it can also be detected after the last stamping, but detecting after the first stamping can discover problems earlier. Of course, it can also be detected after the first stamping and after the last stamping, which can also screen the product grade or defective products of the finally formed product.

[0154] S302, Perform image analysis on the scanned image to determine whether the multiple arched ribs corresponding to the same shielding cover forming area on the aluminum plate are deformed.

[0155] If no deformation occurs, step S303 is executed;

[0156] If only grade-I deformation occurs, step S308 is executed;

[0157] If any arched rib undergoes grade-III deformation, step S305 is executed;

[0158] If only grade-II deformation occurs and the proportion K1 of all arched ribs with grade-II deformation on the aluminum plate is greater than the first preset proportion threshold K01, step S305 is executed; if K1 ≤ K01, step S306 is executed to determine whether to continue stamping;

[0159] If both grade-I deformation and grade-II deformation occur simultaneously, and the proportion K3 of the sum of all arched ribs with grade-I deformation and those with grade-II deformation on the aluminum plate is less than the third preset proportion threshold K03, and the proportion K4 of the arched ribs with grade-I deformation is less than or equal to the fifth preset proportion threshold K05, step S306 is executed; if K3 ≥ K03, step S305 is executed; if K3 < K03 but K4 > K05, step S308 is executed.

[0160] S303, perform the next stamping until stamping is completed, and then execute step S103. Of course, if no deformation occurs, the next stamping can be directly carried out.

[0161] S304, reduce the deceleration gradient, and then execute step S303.

[0162] S305, stop stamping and notify to replace the aluminum plate.

[0163] If any arched rib undergoes grade-III deformation, the deformation will inevitably be further increased during subsequent stamping. Therefore, directly replace the aluminum plate, that is, conduct defective product screening in advance.

[0164] S306, stop stamping and conduct manual verification to determine whether to continue stamping.

[0165] S308, determine whether there are shared arched ribs among the deformed arched ribs, or whether two adjacent arched ribs are deformed simultaneously. If so, execute step S306; otherwise, execute step S304.

[0166] In this embodiment, if it is obtained through scanning image analysis before stamping that the rib protrusions on the lower die base have not deformed, or after maintenance or after replacing the die, it is obtained through scanning image analysis that the arched ribs obtained from the first stamping have deformed. Then it is very likely that the stamping speed is inappropriate, resulting in the deformation of the arched ribs. Therefore, image scanning is used to identify whether deformation has occurred. If slight deformation has occurred, it can be adjusted by adjusting the stamping speed. If the deformation is relatively severe, the aluminum plate needs to be removed, that is, defective product screening is carried out in advance. Especially when there is a grade I or grade II deformation of the arched ribs, it is necessary to judge whether there are shared arched ribs in the deformation. If so, it is necessary to remind to replace the aluminum plate. If not, corresponding measures can be taken according to the actual situation, such as the proportion of grade I deformation, such as replacing the aluminum plate or manual verification.

[0167] In other embodiments, refer to Figure 3 , if it is determined in step S302 that only grade I deformation has occurred, before executing step S308, the following steps are further included:

[0168] S307. Judge whether the positions of the arched ribs where deformation occurs correspond one-to-one to the positions of the rib protrusions where grade I deformation occurs recorded in step S206. If so, execute step S304; otherwise, execute step S308. If they correspond one-to-one, it means that each rib protrusion where grade I deformation occurs causes the arched ribs at the corresponding position to have grade I deformation. If they do not correspond one-to-one, it means that even the arched ribs corresponding to the rib protrusions that have not deformed have deformed. Therefore, it is necessary to judge whether there are common ribs or connected / adjacent arched ribs corresponding to the same shielding forming area that have deformed to make a decision. For example, since only grade I deformation occurs and the amount is small (for example, the proportion of grade I deformation is less than the preset threshold), and there are no shared ribs or no connected / adjacent arched ribs that have deformed, then execute S304.

[0169] Of course, in some other embodiments, when it is determined in step S302 that both level-I deformation and level-II deformation occur, before performing step S308, it is also possible to first determine whether each arched rib where the level-I deformation occurs corresponds one-to-one to the position where the rib protrusion of the lower die base with level-I deformation is pre-recorded. If so, it indicates that each rib protrusion with level-I deformation causes the corresponding arched rib to have level-I deformation, and the level-II deformation that occurs may be caused by the process, and the proportion of the level-II deformation that occurs is relatively small. Therefore, it is possible to first observe and perform capture S308. Of course, if the proportion of the level-II deformation that occurs is greater than the proportion of the level-I deformation that occurs, manual verification is required to determine whether process parameters need to be adjusted, such as the stamping speed and / or the stamping force; if they do not correspond one-to-one, it indicates that the rib protrusion with level-I deformation not only causes level-I deformation, but also causes level-II deformation under the combined action of some of them and the process. Therefore, manual verification is required to determine whether process parameters need to be adjusted.

[0170] Embodiment 4: The present invention also provides another preparation process, which includes the steps in each embodiment. The difference is that, referring to Figure 4 , in this embodiment, if the number of stampings is greater than 3, before the last two stampings in step S102, the following steps are further included:

[0171] S401, scanning the aluminum plate with a scanning device to obtain a scanned image of the aluminum plate after the previous stamping.

[0172] S402, performing image analysis on the scanned image to obtain the actual height of each arched rib.

[0173] S403, determining whether the actual height of each arched rib reaches the preset height threshold corresponding to the current stamping;

[0174] If the proportion P1 of the arched ribs whose actual height reaches the corresponding preset height threshold is greater than or equal to the first preset compliance threshold, perform step S404;

[0175] If the proportion P1 of the arched ribs whose actual height reaches the corresponding preset height threshold is less than the first preset compliance threshold, and it is determined in step S205 that the rib protrusion in the lower die base has level-I deformation or level-II deformation, perform step S405;

[0176] If the proportion P1 of the arched ribs whose actual height reaches the corresponding preset height threshold is less than the first preset compliance threshold, and it is determined in step S205 that the rib protrusion in the lower die base has not deformed, perform step S408.

[0177] S404. Control the mold to perform the next stamping, and execute steps S301 - S308, that is, after each stamping in the last two stamping steps, it is necessary to detect whether the arched ribs obtained by stamping are deformed.

[0178] S405. Based on the scanned image in step S401, perform image analysis to identify whether the arched ribs on the aluminum plate are deformed. If none of them are deformed, execute step S404; if only grade I deformation occurs and the arched ribs with grade I deformation do not include the shared arched ribs, execute step S406; if any arched rib has grade III deformation, execute step S407; if only grade II deformation occurs and the proportion K1' of the rib protrusions with grade II deformation is greater than the first preset proportion threshold K01', execute step S408; if both grade I deformation and grade II deformation occur, where the proportion K3' of the sum of the arched ribs with grade I deformation and the arched ribs with grade II deformation is less than the third preset proportion threshold K03', and the proportion K4' of the arched ribs with grade I deformation is less than the fifth preset proportion threshold K05', execute step S408; if K3' ≥ K03', execute step S407; if K3' < K03', but K4' > K05', and there are no shared arched ribs among the deformed arched ribs, execute step S406.

[0179] S406. Reduce the deceleration gradient and execute step S404.

[0180] S407. Stop stamping and notify to replace the aluminum plate.

[0181] S408. Stop stamping and notify for manual verification.

[0182] Since 1070 aluminum or 1060 aluminum is relatively soft and some of the rib protrusions in the lower die base have slight deformation, if scanning and identification are performed every time, it will increase the data processing volume of the system, thereby increasing the system power consumption. Moreover, since it is more than 3 times of stamping, actually the change amount after each stamping is very small, which may cause the currently formed arched ribs to be deformed after each stamping. Therefore, scan before each stamping and perform corresponding identification and judgment to ensure the forming of the arched ribs.

[0183] Of course, in some other embodiments, before performing deformation identification, judge whether the actual height reaches the expectation. If the proportion P1 of the arched ribs whose actual height does not reach the first height is less than the first preset non - compliance threshold, then perform the identification of whether the arched ribs are deformed.

[0184] Example Six: Since the image analysis of the scanned image is used to determine the arched ribs on the aluminum plate or whether the rib protrusions on the mold are deformed, there will inevitably be other interferences that may lead to misidentification. Especially for Class I deformation, the probability of misidentification is much higher than that of Class II deformation, and the probability of misidentification of Class II deformation is much higher than that of Class III deformation. Therefore, in order to reduce the misidentification rate, in addition to including the steps of any of the above embodiments, the preparation process of this embodiment further includes the steps:

[0185] When at least one rib protrusion on the lower die base is identified as having Class I and / or Class II deformation, trigger the scanning device to scan again to obtain a secondary scanned image, and perform image analysis on it to obtain at least one of the deformation grade and the proportion of the deformed rib protrusion of the deformed rib protrusion, as well as the deformation grade and position information of the deformed rib protrusion; and compare the results of the two analyses:

[0186] If the proportions are different, it indicates misjudgment (for example, the proportion analyzed in the secondary scanning result is less than the proportion analyzed in the first scanning result) or missed detection (for example, the proportion analyzed in the secondary scanning result is greater than the proportion analyzed in the first scanning result), and remind manual verification;

[0187] If the proportions are the same, and the positions and deformation grades of all the deformed rib protrusions are the same, it indicates that there is no misjudgment, and record its deformation grade and position information;

[0188] If the proportions are the same, but the positions of at least one of the deformed rib protrusions are the same and the deformation grades are different, or the positions of at least one of the deformed rib protrusions are different, it indicates misjudgment, and remind manual verification.

[0189] Of course, in order to reduce the system calculation amount, it is also possible to only scan the specified area. Of course, the specified area includes the area where at least one rib protrusion with Class I deformation is identified, and then only compare the analysis results of the specified area. If the analysis results are consistent (that is, the deformation grades and positions of the deformed rib protrusions are the same), it indicates that there is no misjudgment. If the analysis results are inconsistent (for example, the deformation grades are inconsistent, or the positions of the deformed rib protrusions are different, or the rib protrusions that are deformed in the first scanning analysis result are not deformed in the second scanning analysis result, etc.), it indicates misjudgment.

[0190] Example Seven: Based on the preparation process in any of the above embodiments, the present invention further provides a heat sink with a shielding function for a PCB board, which will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0191] See Figure 6, the heat sink of this embodiment includes: a heat dissipation body 200, at least one shielding cover 202 provided on the heat dissipation body 200 and a shielding frame 201 around it, and a nano-carbon heat dissipation coating is provided on the outer side surface of the heat dissipation body 200 (the side away from the PCB and the chips on the PCB board).

[0192] In some embodiments, the shielding frame 201 is formed by enclosing at least one arched rib 201-1 formed by stamping, and nickel-carbon rubber strips that can contact and conduct with the exposed copper surface reserved on the bottom surface of the PCB board are uniformly arranged on each arched rib 201-1, and the nickel-carbon rubber strips are cured.

[0193] Preferably, refer to Figure 6 , three shielding frames 201 are respectively provided on the heat dissipation body 200 corresponding to three shielding areas of a circuit board, such as a PCB board. Among them, two shielding frames 201 are both formed by enclosing four arched ribs 201-1 to form a quadrilateral frame, for example, a rectangular shielding frame. Another shielding frame 201 is formed by enclosing six arched ribs 201-1 to form a hexagonal frame.

[0194] Such as Figures 6 - 9 shown, corresponding to chips of different sizes, the sizes of the two quadrilateral frames are also different. Similarly, corresponding to irregular chips or irregularly shaped heat dissipation areas, the lengths of the six sides of the hexagonal frame are also different. Specifically, refer to Figure 2 , the length of the arched rib I corresponding to the top side in the hexagonal frame is L31; the lengths of the arched ribs II and III respectively connected to both ends of the arched rib I in the hexagonal frame are L32 and L33; the length of the arched rib IV connected to the arched rib II in the hexagonal frame is L34; the length of the arched rib V connected to the arched rib III is L35; the length of the arched rib VI respectively connected to both ends of the arched rib II and the arched rib III in the hexagonal frame is L36; L32 ≤ L31 < L33 ≤ L35 < L34 < L36, refer to Figure 7 and Figure 9 .

[0195] In some other embodiments, refer to Figure 10 , three shielding frames 201 are respectively provided on the heat dissipation body 200 corresponding to three shielding areas of a circuit board, such as a PCB board, and the three shielding frames 201 are all formed by enclosing four arched ribs 201-1 to form a quadrilateral frame. Two of them are rectangular shielding frames; the other is a special-shaped quadrilateral frame. And, the three shielding frames 201 share one arched rib.

[0196] It should be noted that in this text, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including such element.

[0197] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-described embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions for causing a computer terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in various embodiments of the present invention.

[0198] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the spirit of the present invention and the scope protected by the claims. All of these fall within the protection scope of the present invention.

Claims

1. Preparation process of a radiator with shielding function for a PCB board, characterized in that, Including the steps: S101, raw material cutting: Cut the 1070 / 1060 aluminum plate with a thickness of 2.0MM - 2.5MM into a preset size and shape; S102, stamping forming: Use a stamping die to stamp the 1070 / 1060 aluminum plate multiple times to form a plate - type radiator with multiple shielding cavities; where the stamping speed v is 20 - 30 times per minute; the stamping pressure is 200 tons - 220 tons; and during each stamping, when the upper die base and the lower die base of the stamping die are completely closed, full pressure is applied until reaching the preset full - pressure time threshold and then the next stamping is carried out; the preset full - pressure time threshold is 2 - 3s; S103, trimming: Remove the excess burrs to ensure the product edges are smooth; S104, nano - carbon heat - dissipation spraying: Spray a nano - carbon heat - dissipation coating on the outer side of the radiator; S105, uniformly set conductive adhesive on the arched ribs obtained by stamping for contacting and conducting with the exposed copper surface reserved on the bottom surface of the PCB board, and then heat it to cure, so that when the plate - type radiator is installed on the PCB board, a closed shielding cavity is formed between the shielding cavity and the bottom surface of the PCB board; where the highest temperature zone during the curing process of the conductive adhesive by heating is 150°C, and it is heated at the highest temperature zone for 30 min; where multiple shielding - cover forming areas are provided on the lower die base, and multiple rib protrusions are enclosed at the edge of each shielding - cover forming area, and corresponding to each rib protrusion at the bottom of the upper die base, there is a punching groove that can cooperate with the rib protrusion; Among them, before the second stamping after the first stamping in step S102, there is also a step: S301, Use a scanning device to scan the aluminum plate to obtain a scanned image of the aluminum plate after the first stamping; S302, Perform image analysis on the scanned image to determine whether multiple arched ribs corresponding to the same shielding - cover forming area on the aluminum plate are deformed. If none of them are deformed, execute step S303; if only grade - I deformation occurs, execute step S307; if any arched rib has grade - III deformation, execute step S305; if only grade - II deformation occurs and the proportion K1 of all arched ribs with grade - II deformation on the aluminum plate is less than or equal to the first preset proportion threshold K01, execute step S306; if both grade - I deformation and grade - II deformation occur, and the proportion K3 of the sum of all arched ribs with grade - I deformation and arched ribs with grade - II deformation on the aluminum plate is less than the third preset proportion threshold K03, and the proportion K4 of the arched ribs with grade - I deformation is less than or equal to the fifth preset proportion threshold K05, execute step S306; if K3≥K03, execute step S305; if K3<K03, but K4>K05, execute step S308; S303, Carry out the next stamping until the stamping is completed, and execute step S103; S304, Reduce the deceleration gradient and execute step S303; S305, Stop stamping and notify to replace the aluminum plate; S306, Stop stamping and conduct manual verification; S307. Determine whether the positions of the deformed arched ribs correspond one by one to the positions of the deformed rib protrusions pre-recorded on the lower die base. If so, execute step S304; otherwise, execute step S308. S308. Determine whether there are shared arched ribs among the deformed arched ribs, or whether two adjacent arched ribs are deformed simultaneously. If so, execute step S306; otherwise, execute step S304.

2. The preparation process of a radiator with shielding function for a PCB board according to claim 1, characterized in that, If it is preset to perform stamping 3 times, before executing step S301, it further includes the steps: Use a scanning device to scan the aluminum plate to obtain a scanned image of the aluminum plate after the first stamping. Perform image analysis on the scanned image to obtain the actual height of each arched rib. Determine whether the actual height of each arched rib reaches a preset first height. If the proportion P1 of the arched ribs whose actual height does not reach the first height is less than a first preset non-compliance threshold, execute steps S301 - S307. If the proportion P1 of the arched ribs whose actual height does not reach the first height is greater than or equal to the first preset non-compliance threshold, prompt to adjust the stamping force and / or stamping speed.

3. The preparation process of a radiator with shielding function for a PCB board according to claim 2, characterized in that, In step S102, stamping is performed 3 times, and the stamping is carried out in a gradient deceleration manner during the 3 - time stamping process. Specifically, it includes the steps: S1021. During the first stamping, stamp at a first stamping speed V1, and keep the pressure for 2 s - 3 s after stamping; where V1 = 200 mm / s. S1022. During the second stamping, stamp at a second stamping speed V2, and keep the pressure for 2 s - 3 s after stamping; where V2 = 150 mm / s. S1023. During the third stamping, stamp at a third stamping speed V3, and after keeping the pressure for 2 s - 3 s, control the upper die base to leave the lower die base at a preset return speed; where V3 = 100 mm / s.

4. The preparation process of a radiator with shielding function for a PCB board according to claim 1, characterized in that, When the number of stampings in step S102 is greater than 3, the stamping is carried out in a gradient deceleration manner, and before the last two stampings, it further includes the steps: S401. Use a scanning device to scan the aluminum plate to obtain a scanned image of the aluminum plate after the previous stamping. S402. Perform image analysis on the scanned image to obtain the actual height of each arched rib. S403. Determine whether the actual height of each arched rib reaches the preset height threshold corresponding to the current stamping. If the proportion P1 of the arched ribs whose actual height reaches the corresponding preset height threshold is greater than or equal to a first preset compliance threshold, execute step S404; if the proportion P1 of the arched ribs whose actual height reaches the corresponding preset height threshold is less than the first preset compliance threshold, and it is pre-judged that the rib protrusions in the lower die base undergo grade I deformation before stamping, execute step S405. S404. Control the mold to perform the next stamping, and execute steps S301 - S308. S405. Based on the scanned image in step S401, perform image analysis to identify whether the arched ribs on the aluminum plate are deformed. If none of them are deformed, execute step S404; if only a grade-I deformation occurs and the arched ribs with grade-I deformation do not include the shared arched ribs, execute step S406; if any arched rib has a grade-III deformation, execute step S407; if only a grade-II deformation occurs and the proportion K1' of the rib protrusions with grade-II deformation is greater than the first preset proportion threshold K01', execute step S408; if both grade-I deformation and grade-II deformation occur, where the proportion K3' of the sum of the arched ribs with grade-I deformation and the arched ribs with grade-II deformation is less than the third preset proportion threshold K03', and the proportion K4' of the arched ribs with grade-I deformation is less than the fifth preset proportion threshold K05', execute step S408; if K3'≥K03', execute step S407; if K3'<K03', but K4'>K05', and there are no shared arched ribs among the deformed arched ribs, execute step S406; S406. Reduce the deceleration gradient and execute step S404; S407. Stop stamping and notify to replace the aluminum plate; S408. Stop stamping and notify for manual verification.

5. The preparation process of a radiator with shielding function for a PCB board according to claim 4, characterized in that, The deceleration gradient α can be determined by the following formula: ； Among them, N is the number of stamping times, t is the actual material thickness of 1070 / 1060 aluminum plate; t0 is the reference material thickness of 1070 / 1060 aluminum plate, and its value is 2 mm; α0 is the initial deceleration gradient, which is an empirical value; k N is the attenuation coefficient of 1070 / 1060 aluminum plate and the mold; k t is the sensitivity of the 1070 / 1060 aluminum plate thickness to the deceleration gradient.

6. The preparation process of a radiator with shielding function for a PCB board according to claim 4, characterized in that, Before step S102, it further includes the step: S201. Use a scanning device to scan the lower die base to obtain a scanned image of the lower die base; S202. Perform image analysis on the scanned image to obtain the deformation grade of each rib protrusion on the lower die base and the proportion of the deformed rib protrusions; If any rib protrusion has a grade-III deformation, execute step S203; If none of the rib protrusions have a grade-III deformation, but at least one rib protrusion around any shielding cover forming area is deformed, execute step S204 or S205; S203. Notify to replace the lower die base; S204. If two adjacent rib protrusions are deformed and one of the rib protrusions is a grade-II deformation, or both are grade-I deformations, notify to replace the mold; S205. If only one rib protrusion has a grade-I deformation, determine whether the deformed rib protrusion is a shared rib protrusion. If so, notify to replace the mold, otherwise, execute step S206; S206. Record the position information of the rib protrusions with grade-I deformation and execute step S102.

7. The preparation process of a radiator with shielding function for a PCB board according to any one of claims 1 to 6, characterized in that, The rib protrusion having a grade-III deformation includes that the included angle between the axial direction of the rib protrusion and the direction perpendicular to the upper surface of the lower die base is greater than 10°; 8. The preparation process of a radiator with shielding function for a PCB board according to any one of claims 1 to 6, characterized in that, The rib protrusion having a grade-II deformation includes that the included angle between the axial direction of the rib protrusion and the direction perpendicular to the upper surface of the lower die base is <10°, but greater than 2°; 9. The manufacturing process of a radiator with shielding function for a PCB board according to any one of claims 1 to 6, characterized in that, The rib protrusion having a grade-I deformation includes that the included angle between the axial direction of the rib protrusion and the direction perpendicular to the upper surface of the lower die base is <2°, but greater than 0°.

10. A radiator with shielding function for a PCB board, characterized in that, The radiator is prepared by using the preparation process described in any one of claims 1 to 9, and includes a heat dissipation body, at least one shielding cover disposed on the heat dissipation body and a shielding frame around it, and a nano-carbon heat dissipation coating is disposed on the outer side surface of the heat dissipation body; Wherein, the shielding frame is formed by enclosing at least one arched rib formed by stamping, and a conductive adhesive capable of contacting and conducting with the exposed copper surface reserved on the bottom surface of the PCB board is disposed on each arched rib, and the conductive adhesive is subjected to a curing treatment; and at least two shielding frames share one arched rib.

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