Radiator with shielding function for PCB (Printed Circuit Board) and preparation process thereof

Abstract

The invention relates to the technical field of PCB heat dissipation, in particular to a heat radiator with a shielding function for a PCB and a preparation process thereof, and the preparation process comprises the following steps: S101, raw material cutting: cutting a 1070 / 1060 aluminum plate into a preset size and shape; s102, punch forming is conducted, specifically, the 1070 / 1060 aluminum plate is punched multiple times through a punching die, and a plate type radiator with a plurality of shielding cavities is formed; saturated pressing is carried out after each time of punching; s103, trimming is carried out; s104, nano carbon heat dissipation spraying is carried out; and S105, conductive adhesive is uniformly arranged on the arched ribs. The stamping die and / or the arched ribs formed by stamping are monitored in real time in the stamping process and / or before stamping, and therefore it is guaranteed that stamping forming can be conducted even if a very soft aluminum plate is adopted.

Description

Technical Field

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

[0002] When a chip operates, it generates electromagnetic waves and heat. The electromagnetic waves can damage other electronic components. To avoid and reduce this situation, a shielding cover is added to the chip to shield the electromagnetic waves and reduce the damage. The heat generated by the chip during operation can affect the function and lifespan of the chip. In this case, a radiator is needed to dissipate heat. The shielding covers and radiators on existing electronic devices are separately separated. Not only do they need to be produced separately, but also installed separately. When installing the shielding cover and the radiator separately, the combination of the shielding cover and the radiator is inconvenient, which easily leads to interference between structures, resulting in poor contact between the shielding cover and the radiator, affecting the use effects of the radiator and the shielding cover. At the same time, there is a certain contact area between the shielding cover and the radiator, increasing the material usage. Based on this, a structure combining the shielding cover and the radiator has been proposed in the prior art. However, it still requires separately producing the shielding cover and the radiator and then assembling the two together.

[0003] For example, the Chinese utility model patent with the publication number CN209489103U discloses a radiator combining a multi-functional shielding cover and heat dissipation, including a first shielding plate, a second shielding plate, a heat dissipation plate, mounting holes, heat dissipation holes, a first chip, heat dissipation empty slots, a second chip, a first chip cover, and a second chip cover. By fixedly installing a first chip cover above the first chip and a second chip cover above the second chip, the electromagnetic waves received by the first chip and the second chip are reduced, completing 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, reducing the assembly time of the first shielding plate and the second shielding plate. By providing heat dissipation holes on the heat dissipation plate, heat dissipation of the heat dissipation plate is completed. When too much heat accumulates, the heat is discharged through the heat dissipation empty slots on one side of the heat dissipation holes. This radiator combines the shielding cover and the radiator by welding, reducing the thermal resistance generated by assembly and saving the time cost of assembly.

[0004] The above discrete design not only has a cumbersome production process, but also requires mold forming for both the chip cover, the shielding plate, and the heat dissipation plate, resulting in high mold costs and high material costs. Secondly, the backend assembly production is also relatively complex, 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 complex and cumbersome. Based on this, the prior art has also proposed using a die-casting process to process an integrated structure of a radiator and a 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; a plurality of 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 molds to form after the aluminum alloy is melted, but the cost of production molds 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 shielding function for 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 also 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: In the first aspect of the present invention, it is to provide a preparation process for a radiator with shielding function for PCB board, which includes 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 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 / minute; the stamping force is 200 tons - 220 tons; and each stamping is saturated with pressure when the upper die holder and the lower die holder of the stamping die are completely closed, and then the next stamping is carried out until the preset saturated pressure time threshold is reached; the preset saturated pressure time threshold is 2-3s; S103, trimming: Remove the excess burrs to ensure that the edges of the product are smooth; S104, Nano-carbon heat dissipation spraying: Spray a nano-carbon heat dissipation coating on the outer side of the radiator; S105, Uniformly apply a 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 area during the curing process of the conductive adhesive by heating is 150 °C, and it is heated for 30 min in the highest temperature area; wherein, a plurality of shielding cover forming areas are provided on the lower die base, and a plurality of rib protrusions are enclosed around 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; Among them, after the first stamping and before the second stamping in step S102, the following steps are further included: S301, Obtain the scanned image of the aluminum plate after the first stamping by scanning the aluminum plate using a scanning device; 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. If not deformed, execute step S303; if only grade I deformation occurs, execute step S307; if any arched rib undergoes 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 among them 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; 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 arched ribs with grade I deformation correspond one by one to the positions of the rib protrusions with grade I deformation on the lower die base pre-recorded in step S206. If so, execute step S304; otherwise, execute step S308; S308. Determine whether there is a shared arched rib in the deformed arched ribs, or whether two adjacent arched ribs are deformed simultaneously. If so, execute step S306; otherwise, execute step S304.

[0010] In some embodiments, if the preset number of stamping operations is 3, before executing step S301, the following steps are further included: Obtain a scanned image of the aluminum plate after the first stamping by scanning the aluminum plate using a scanning device. 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 pressure and / or stamping speed.

[0011] In some embodiments, in step S102, stamping is performed 3 times, and the stamping is carried out in a gradient deceleration manner during the 3 stamping processes. Specifically, it includes the following steps: S1021. During the first stamping, stamp at a first stamping speed V1, and keep the pressure for 2 - 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 - 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 - 3 s, control the upper die holder to leave the lower die holder at a preset return speed; where V3 = 100 mm / s.

[0012] In some embodiments, when the number of stamping operations in step S102 is greater than 3, the stamping is carried out in a gradient deceleration manner, and before the last two stampings, the following steps are further included: S401. Scan the aluminum plate using a scanning device 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 of the arched rib strips reaches the preset height threshold corresponding to the current stamping. If the proportion P1 of the arched rib strips 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 rib strips whose actual height reaches the corresponding preset height threshold is less than the first preset compliance threshold, and it is pre-judged that a level-I deformation occurs in the rib protrusions in the lower die base 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 rib strips on the aluminum plate are deformed. If none of them are deformed, execute step S404. If only a level-I deformation occurs and the arched rib strips with level-I deformation do not include the shared arched rib strips, execute step S406. If any of the arched rib strips has a level-III deformation, execute step S407. If only a level-II deformation occurs and the proportion K1' of the rib protrusions with level-II deformation is greater than the first preset proportion threshold K01', execute step S408. If both a level-I deformation and a level-II deformation occur, where the proportion K3' of the sum of the arched rib strips with level-I deformation and the arched rib strips with level-II deformation is less than the third preset proportion threshold K03', and the proportion K4' of the arched rib strips with level-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 rib strips among the deformed arched rib strips, 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.

[0013] In some embodiments, the deceleration gradient α can be determined by the following formula: ; where N is the number of stampings, t is the actual material thickness of the 1070 / 1060 aluminum plate; t 0 is the reference material thickness of the 1070 / 1060 aluminum plate, and its value is 2 mm; α 0 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.

[0014] In some embodiments, before step S102, the following step is further included: 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 level of each rib protrusion on the lower die base and the proportion of deformed rib protrusions. If any rib protrusion undergoes a level III deformation, execute step S203. If no rib protrusion undergoes a level 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 around any shielding cover forming area are deformed, and one of the rib protrusions is at level II deformation, or both are at level I deformation, notify to perform maintenance or replace the die. S205. If only one rib protrusion around any shielding cover forming area is at level I deformation, determine whether the deformed rib protrusion is a shared rib protrusion. If so, notify to replace the die. Otherwise, execute step S206. S206. Record the position information of the rib protrusion with level I deformation, and execute step S102.

[0015] In some embodiments, the rib protrusion undergoing a level III deformation includes that 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°.

[0016] In some embodiments, the rib protrusion undergoing a level II deformation includes that the angle between the axis of the rib protrusion and the direction perpendicular to the upper surface of the lower die base is < 10°, but greater than 2°.

[0017] In some embodiments, the rib protrusion undergoing a level I deformation includes that the angle between the axis of the rib protrusion and the direction perpendicular to the upper surface of the lower die base is < 2°, but greater than 0°.

[0018] In some embodiments, before executing step S307, it further includes the step: If it is determined in step S302 that a level I deformation occurs, determine whether the position of the arched rib with level I deformation corresponds one-to-one to the position of the rib protrusion with level I deformation recorded in step S206. If so, execute step S304; otherwise, execute step S307.

[0019] The second aspect of the present invention lies in providing 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 the PCB board as described above. It includes a heat dissipation body, at least one shielding cover disposed on the heat dissipation body and a shielding frame around it. A nano-carbon heat dissipation coating is provided 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. Each arched rib 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.

[0020] 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. And 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 not easily formed by die-casting processes. Even stamping processes are not easy to form because of their low strength (tensile strength is about 60 - 95MPa) and low hardness, which causes them to be prone to local deformation or tearing during stamping and difficult to maintain shape stability. However, they have good ductility (elongation rate 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 usually not 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 process, 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 a low heat dissipation performance, and the die-cast heat sink has a high cost.

[0021] In view of this, the present application proposes a process for preparing a heat sink with a shielding function using 1070 or 1060 aluminum. Specifically, by using a multi-stamping method and combining it with a decreasing stamping speed method, arched ribs are gradually formed on the 1070 or 1060 aluminum plate, and a shielding frame is formed by enclosing multiple arched ribs. A conductive adhesive, such as a nickel-carbon rubber strip, is coated on the arched ribs, so as to prepare a heat sink that can be used for shielding signals. By gradually forming through multi-stamping, the amount of deformation per single time is reduced, thus ensuring the forming.

[0022] Further, 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, the mold is notified to be replaced, thus avoiding the inability to form a shielding cover with shielding effect due to serious deformation of the rib protrusions. Further still, before and / or after each stamping, the formed arched ribs are scanned to determine whether the arched ribs formed on the aluminum plate are deformed. If deformation occurs, timely adjustment is made or a prompt is given to replace the aluminum plate (i.e., forming failure). That is to say, the core lies in ensuring no deformation or slight deformation during the stamping process through a detection mechanism, so as to ensure product forming, that is, to solve the problem in the prior art that it is impossible to use the stamping process to stamp 1060 / 1070 aluminum plates to obtain a radiator with shielding function.

[0023] The radiator of the present application can achieve 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

[0024] 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 proportion. 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 based on these drawings without creative efforts.

[0025] Figure 1 It is a flowchart of an embodiment of the preparation process of a radiator with shielding function for a PBC board of the present invention; 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; Figure 3 It is a flowchart of an embodiment of identifying whether the arched ribs formed by stamping on the aluminum plate are deformed in the present invention; Figure 4 It is a flowchart of another embodiment of identifying whether the arched ribs formed by stamping on the aluminum plate are deformed in the present invention; Figure 5 It is a schematic diagram of the distribution of the rib protrusions on the lower die base used in the preparation process of the present invention; Figure 6 It is a top view of the radiator prepared by the preparation process of the present invention; Figure 7 To reflectFigure 6 Connection diagram of the six sides of the hexagonal shielding frame in the shown radiator; Figure 8 To reflect Figure 6 Schematic diagram of the side of the radiator in; Figure 9 Is a physical photo of a radiator prepared by using the preparation process of the present invention. The arrow in the figure indicates the arched rib formed by the stamping process (its surface is coated with conductive glue); Figure 10 Is a model diagram of another radiator prepared by using the preparation process of the present invention.

[0026] Summary of reference numeral identification: 100, lower die holder; 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

[0027] 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.

[0028] In this article, suffixes such as "module", "component" or "unit" used to represent elements are only for the convenience of description of the present invention and have no specific meaning in themselves. Therefore, "module", "component" or "unit" can be used interchangeably.

[0029] In this article, terms such as "upper", "lower", "inner", "outer", "front", "rear", "one end", "the other end", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is 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 therefore cannot be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0030] In this text, unless otherwise clearly stipulated and defined, terms such as "installation", "equipped with", "connection", etc. shall be understood in a broad sense. For example, "connection" 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 components. 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.

[0031] In this text, "and / or" includes any and all combinations of one or more of the listed related items.

[0032] In this text, "a plurality of" means two or more, that is, it includes two, three, four, five, etc.

[0033] As used in this specification, the term "about" typically represents + / - 5% of the stated value, more typically + / - 4% of the stated value, more typically + / - 3% of the stated value, more typically + / - 2% of the stated value, even more typically + / - 1% of the stated value, and even more typically + / - 0.5% of the stated value.

[0034] In this specification, certain embodiments may be disclosed in a format within a certain range. It should be understood that this kind of "within a certain range" description 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 as having 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., and 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.

[0035] 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: S101, raw material cutting: Cut the 1070 / 1060 aluminum plate with a thickness of h into a preset size and shape.

[0036] In some embodiments, the thickness h of the 1070 / 1060 aluminum plate is 2.0 MM - 2.5 MM.

[0037] In some embodiments, the above aluminum plate can also be replaced by an aluminum strip.

[0038] S102, Stamping: Use a stamping die to stamp the cut 1070 / 1060 aluminum plate multiple times to form a plate-type radiator with multiple shielding cavities.

[0039] In some embodiments, during each stamping, when the upper die holder and the lower die holder of the stamping die are completely closed, full pressure is applied until the preset full-pressure time threshold is reached, and then the next stamping is carried out; the preset full-pressure time threshold is 2 - 3 s. By applying full pressure, the aluminum plate after high-speed stamping is prevented from rebounding and deforming.

[0040] 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.

[0041] In some embodiments, multiple shielding cover forming areas 101 are provided on the lower die holder 100, and multiple rib protrusions 102 are enclosed at the edge of each shielding cover forming area 101. Corresponding to each rib protrusion 102 at the bottom of the upper die holder, there is a punching groove that can cooperate with the rib protrusion 102; After the first stamping of the upper die holder towards the lower die holder, under the action of the rib protrusions 102, multiple arched ribs of the first height are formed on the aluminum plate; After the second stamping of the upper die holder towards the lower die holder, under the action of the rib protrusions 102, the height of the arched ribs changes from the first height to the second height; the second height is greater than the first height. Repeatedly stamp multiple times until the height of the arched ribs reaches the target height, so that 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.

[0042] Since 1070 aluminum has low strength (tensile strength is about 60 - 95 MPa) and low hardness, it is prone to local deformation or tearing during stamping and difficult to maintain shape stability; and its high plasticity will cause the material to be over-stretched during stamping, and it is easy to become thinner and cause tearing or disconnection. Therefore, in this embodiment, a multi-stamping method is adopted for gradual forming, that is, by controlling the stamping speed to control the amount of arching formed each time to avoid or reduce the risk of fracture, thereby ensuring the forming of the arched ribs.

[0043] Preferably, in step S102, stamping is carried out 3 times, and during the 3 stamping processes, stamping is carried out in a gradient deceleration manner. Specifically, it includes the steps: S1021, During the first stamping, stamping is carried out at the first stamping speed V1, and after stamping, full pressure is applied for 2 - 3 s; where V1 = 200 mm / s.

[0044] S1022. During the second stamping, perform stamping at the second stamping speed V2, and keep the pressure for 2 - 3 s after stamping; where V2 = 150 mm / s.

[0045] S1023. During the third stamping, perform stamping 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.

[0046] In some other embodiments, when the number of stampings is greater than 3, perform stamping in a gradient deceleration manner, and the deceleration gradient α for each stamping can be determined by the following formula: ; where N is the number of stampings, t is the actual material thickness of the 1070 / 1060 aluminum plate; t 0 is the reference material thickness of the 1070 / 1060 aluminum plate, and its value is 2 mm; α 0 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.

[0047] S103. Trimming: Remove the excess burrs to ensure the smoothness of the product edge.

[0048] S104. Nano-carbon heat dissipation spraying: Spray a nano-carbon heat dissipation coating on the outer side of the radiator.

[0049] S105. Uniformly arrange nickel-carbon rubber strips on the arched ribs 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 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.

[0050] In some embodiments, in addition to nickel-carbon rubber strips, other conductive rubber strips can also be used on the arched ribs.

[0051] Preferably, the highest temperature zone during the gradual heating of the nickel-carbon rubber strip is 150 °C, and heat it at the highest temperature zone for 30 min.

[0052] In this embodiment, the aluminum plate is stamped in a multi-stamping manner, and pressure is kept after each stamping, and a gradient decreasing manner is adopted, so as to avoid the problems that the area around the arched ribs formed during stamping is prone to breakage due to the softness of the aluminum plate, or the springback after stamping is likely to cause difficult forming or deformation.

[0053] Embodiment 2: Since 1070 aluminum and 1060 aluminum are very soft, during the stamping process, the rib protrusions are mainly used to repeatedly stamp on the aluminum plate to form arched ribs that are slender and have an n-shaped cross-section. Therefore, whether the rib protrusions are deformed will be the key to the successful formation of the arched ribs. Thus, in order to ensure that the arched ribs do not break or deform during the formation process (for example, the lengths or thicknesses of the two arched sides deviate greatly), before stamping, the rib protrusions on the lower die base will also be identified to determine whether they are deformed.

[0054] Generally, if significant deformation occurs, such as fracture or large defects, or the axis of the rib protrusion is inclined at a large angle (i.e., the axis of its protrusion is not perpendicular to the upper surface of the lower die base), it can be identified by the naked eye of a human. In this case, the mold will be replaced or maintained before stamping. However, the maintenance is not real-time but periodic, and manual operations are always prone to omissions. Also, since the height of the arched ribs formed on the aluminum plate is not high, correspondingly, the rib protrusions on the mold are not high either. Therefore, if its axis is not inclined significantly, for example, the included angle between the axis 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 quickly and clearly identify with the naked eye. Additionally, since the shielding frame is formed by enclosing multiple arched ribs, if a single arched rib is deformed, it may affect the two adjacent arched ribs. Therefore, to ensure the formation of a single arched rib and at the same time to ensure the formation of the shielding frame formed by enclosing multiple arched ribs, the present invention also provides another preparation process. Before stamping, it scans the lower die base with a scanning device 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 identified based on this scanning image.

[0055] Specifically, this embodiment includes each step in the above Embodiment 1. The difference is that before step S102 in the preparation process of this embodiment, it further includes the steps: S201, scanning the lower die base with a scanning device to obtain a scanning image of the lower die base; S202, performing image analysis on the scanning image to obtain the deformation grade of each rib protrusion on the lower die base and the proportion of deformed rib protrusions; If any rib protrusion undergoes a grade III deformation, notify to replace the lower die base; 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, 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; If only a type-I deformation occurs and the proportion K2 of the rib protrusions with type-I deformation is less than the third preset proportion threshold K03, step S102 is executed; if it is greater than the third preset proportion threshold K03, maintenance is notified. If a type-I deformation and a type-II deformation occur simultaneously and the proportion K1 of the rib protrusions with type-II deformation is less than or equal to the fourth preset proportion threshold K04, where K04 < K01; among them, If the ratio K3 between the rib protrusions with type-I deformation and the rib protrusions with type-II deformation is greater than the first preset ratio threshold, step S102 is executed; If the ratio K3 between the rib protrusions with type-I deformation and the rib protrusions with type-II deformation is equal to the first preset ratio threshold, maintenance is notified; If the ratio K3 between the rib protrusions with type-I deformation and the rib protrusions with type-II deformation is less than the first preset ratio threshold, replacement of the lower die base is notified.

[0056] In some embodiments, the control module in the stamping process control system can scan the device for data communication, and the control module performs image analysis on the scanned image to obtain an 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 pre-associated users, such as mobile terminals.

[0057] In this embodiment, the deformation of the rib protrusion refers to the axial deviation of the rib protrusion, or the occurrence of fracture, defect, etc. Among them, the occurrence of fracture or defect, or the axial deviation angle of the rib protrusion being greater than 10° (that is, 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°) is a Class III deformation, that is, the most serious deformation. Once a Class III deformation occurs, during the stamping process, the formed arched rib is likely to break or be defective, etc., resulting in the inability to finally 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 deformation occurs, it can be corrected by maintenance and immediately aligning the rib protrusion. If a large number of Class II deformations occur, then the maintenance cost is high, and even after 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 part of the shielding cover forming area 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 deformation 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 part of the shielding cover forming area; 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 deformation occurs (for example, only 1 or only one Class I deformation occurs around part of the shielding cover forming area), it can be corrected under the combined action of the gradient decreasing stamping method and the punching slot, as well as subsequent processes (such as aligning during trimming). 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 part of the shielding cover forming area; 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.

[0058] 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.

[0059] Embodiment 3: The present invention also provides another preparation process. Before stamping, a scanning device is used to scan the lower mold to obtain a scanned image including each rib protrusion on the lower mold, and then whether the rib protrusions on the lower mold 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 of the preparation process of this embodiment, the following step is further included: S201, using a scanning device to scan the lower die base to obtain a scanned image of the lower die base.

[0060] 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.

[0061] S202, perform 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.

[0062] In this embodiment, the deformation of the rib protrusion refers to the axial offset of the rib protrusion, or the occurrence of fracture, defect, etc. Among them, the occurrence of fracture 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.

[0063] S203, notify to replace the lower die base.

[0064] If the rib protrusion is cracked or defective, 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.

[0065] If the axial offset angle of the rib protrusion is greater than 10°, then there will be cracks or disconnections between it and the adjacent two rib protrusions, thus preventing the formation of a closed shielding frame formed by multiple arched ribs connected 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, and even part of one side or between the two sides may break due to being too thin or insufficient aluminum replenishment during the stamping process.

[0066] 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.

[0067] 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 the replacement of 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.

[0068] Of course, if there is no rib protrusion with a level-III deformation, 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 the multiple arched ribs are connected, even if the two deformed rib protrusions have not undergone a certain type of deformation, during the stamping process, in addition to the arched ribs corresponding to these two rib protrusions being deformed, the ones connected to these two arched ribs will also be deformed. Therefore, when at least two non-adjacent rib protrusions with deformations are detected, the replacement of the mold will be directly notified.

[0069] S205, if only one rib protrusion is deformed at level-I, determine whether the deformed rib protrusion is a shared rib protrusion. If so, execute step S203; otherwise, execute step S206.

[0070] S206, record the position information of the rib protrusion, and perform step S102.

[0071] If among multiple rib protrusions in the same shielding cover forming area, only the axial offset angle of one rib protrusion is less than 2°, the lengths and thicknesses of the two sides of the n-shaped arched rib formed after multiple stampings may also be uneven. However, since the height of the arched rib is not 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 adhesive, more conductive adhesive 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 , therefore, 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.

[0072] 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 be compensated to a certain extent by applying conductive adhesive, 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).

[0073] 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 further included: 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; 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); 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, control the mold to perform the second stamping; 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; Perform image analysis based on the scanned image to identify whether the rib protrusions on the lower die base are deformed. 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 the second stamping and reduce the deceleration gradient; If any rib protrusion has grade III deformation, notify to replace the lower die base; 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; If 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.

[0074] Since three stamping operations are adopted, and the speed of the first stamping is the greatest, 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 indicates 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.

[0075] Of course, in some other embodiments, 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, trigger the scanning device to scan the scanned image of the arched rib strips formed on the aluminum plate after the first stamping, and perform image analysis to determine whether the stamped arched rib strips are deformed. Specifically, refer to steps S301 - S307 in Embodiment 5. If there is no deformation or 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 is not enough.

[0076] Embodiment 5: The present invention also provides another preparation process, which includes each step in Embodiment 2 or 4. The difference is that in this embodiment, when stamping 3 times, after the first stamping in step S102, the following steps are further included: S301, scanning the aluminum plate with a scanning device to obtain a scanned image of the aluminum plate after stamping.

[0077] As mentioned above, since the cost of replacing the mold is very high, therefore, for some cases where the rib protrusions are deformed, 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 forming of the shielding frame (for example, the heads and tails of multiple arched ribs are connected and will not be disconnected from each other, and it can play a shielding role when installed on the PCB board), it is necessary to judge whether the arched ribs after stamping are deformed in this embodiment.

[0078] Since 1070 aluminum or 1060 aluminum is relatively soft, and there may be some rib protrusions with grade I or grade II deformations, which may cause the currently formed arched ribs to be deformed after each stamping. Therefore, scanning can be performed after each stamping to judge whether the arched ribs are deformed. Once it is judged that there is deformation, corresponding prompts or notifications will be given immediately. 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, while the change of the arched ribs after the latter 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 the last stamping, so that the product grade or defective product screening of the finally formed product can also be carried out.

[0079] S302, performing image analysis on the scanned image to judge whether the multiple arched ribs corresponding to the same shielding cover forming area on the aluminum plate are deformed, If there is no deformation, step S303 is executed; If only grade I deformation occurs, step S308 is executed; If any arched rib has grade III deformation, step S305 is executed; If only grade II deformation occurs, and the proportion K1 of all the 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 judge whether to continue stamping; If a type-I deformation and a type-II deformation occur simultaneously, and the proportion K3 of the sum of all the arched ribs with type-I deformation and the arched ribs with type-II deformation on the aluminum plate is less than the third preset proportion threshold K03, and the proportion K4 of the arched ribs with type-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.

[0080] S303. Proceed with the next stamping until the stamping is completed, and then execute step S103. Of course, if no deformation occurs, the next stamping can be directly carried out.

[0081] S304. Reduce the deceleration gradient and execute step S303.

[0082] S305. Stop stamping and notify to replace the aluminum plate.

[0083] If any arched rib has a type-III deformation, the deformation will inevitably be further increased during the subsequent stamping process. Therefore, the aluminum plate is directly replaced, that is, the defective product screening is carried out in advance.

[0084] S306. Stop stamping and conduct manual verification to determine whether to continue stamping.

[0085] 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.

[0086] In this embodiment, if it is obtained through scanned 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 scanned image analysis that the arched ribs obtained from the first stamping are 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 occurs. If slight deformation occurs, it can be adjusted by adjusting the stamping speed. If the deformation is relatively severe, the aluminum plate needs to be removed, that is, the defective product screening is carried out in advance. Especially when there are type-I or type-II deformations of the arched ribs, it is necessary to determine whether there are shared arched ribs in the deformed parts. 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 type-I deformation, such as replacing the aluminum plate or conducting manual verification.

[0087] In other embodiments, refer to Figure 3 , before executing step S308 when it is determined in step S302 that only type-I deformation occurs, the following steps are further included: S307. Determine whether the positions of the bulged ribs that occur correspond one by one to the positions of the raised ribs with grade-I deformation recorded in step S206. If so, execute step S304; otherwise, execute step S308. If they correspond one by one, it indicates that each raised rib with grade-I deformation causes the bulged rib at the corresponding position to have grade-I deformation. If they do not correspond one by one, it means that even the bulged ribs corresponding to the non-deformed rib protrusions have deformed. Therefore, it is necessary to determine whether there are common ribs or connected / adjacent bulged ribs corresponding to the same shielding forming area that have deformed for decision-making. 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 common ribs or no connected / adjacent bulged ribs that have deformed, then execute S304.

[0088] Of course, in some other embodiments, if it is determined in step S302 that both grade-I deformation and grade-II deformation occur, before executing step S308, it is also possible to first determine whether the bulged 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 recorded in advance. If so, it indicates that each raised rib with grade-I deformation causes the bulged rib at the corresponding position to have grade-I deformation, and the grade-II deformation that occurs may be caused by the process and the proportion of grade-II deformation is small. Therefore, it is possible to first observe and execute capture S308. Of course, if the proportion of grade-II deformation is greater than the proportion of grade-I deformation, manual verification is required to determine whether process parameters such as stamping speed and / or stamping force need to be adjusted; if they do not correspond one by one, it means that the raised ribs with grade-I deformation not only cause grade-I deformation, but also cause grade-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.

[0089] 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 stamping times is greater than 3, before the last two stampings in step S102, the following steps are further included: S401. Use a scanning device to scan the aluminum plate to obtain a scanned image of the aluminum plate after the previous stamping.

[0090] S402. Perform image analysis on the scanned image to obtain the actual height of each bulged rib.

[0091] S403. Determine whether the actual height of each bulged rib reaches the preset height threshold corresponding to the current stamping; If the proportion P1 of the bulged 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 when step S205 determines that the rib protrusions in the lower die base have undergone a level I deformation or a level II deformation, step S405 is executed; 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 when step S205 determines that the rib protrusions in the lower die base have not undergone deformation, step S408 is executed.

[0092] 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 formed arched ribs have undergone deformation.

[0093] S405, perform image analysis based on the scanned image in step S401 to identify whether the arched ribs on the aluminum plate have undergone deformation. If none of them have undergone deformation, step S404 is executed; if only a level I deformation occurs and the arched ribs with level I deformation do not include the shared arched ribs, step S406 is executed; if any arched rib undergoes a level III deformation, step S407 is executed; if only a level II deformation occurs and the proportion K1' of the rib protrusions with level II deformation is greater than the first preset proportion threshold K01', step S408 is executed; if both a level I deformation and a level II deformation occur, and the proportion K3' of the sum of the arched ribs with level I deformation and the arched ribs with level II deformation is less than the third preset proportion threshold K03', and the proportion K4' of the arched ribs with level I deformation is less than the fifth preset proportion threshold K05', step S408 is executed; if K3' ≥ K03', step S407 is executed; if K3' < K03', but K4' > K05', and there are no shared arched ribs among the deformed arched ribs, step S406 is executed.

[0094] S406, reduce the deceleration gradient, and execute step S404.

[0095] S407, stop stamping and notify to replace the aluminum plate.

[0096] S408, stop stamping and notify for manual verification.

[0097] Since 1070 aluminum or 1060 aluminum is relatively soft and some of the rib protrusions in the lower die base have slight deformations, if scanning and identification are performed every time, it will increase the data processing volume of the system, thereby increasing the system power consumption. And because it is more than 3 times of stamping, actually the change amount after each stamping is very small, which may cause the formed arched ribs to deform after each stamping. Therefore, scanning is performed before each stamping, and corresponding identification and judgment are carried out to ensure the forming of the arched ribs.

[0098] Of course, in some other embodiments, before performing variant identification, it is determined whether the actual height reaches the expectation. 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, then the identification of whether the arched rib strips have undergone deformation is performed.

[0099] Embodiment Six: Since it is to perform image analysis on the scanned image to determine whether the arched rib strips on the aluminum plate or the rib protrusions on the mold have undergone deformation, there will inevitably be other interferences that may lead to misidentification. Especially for Class I variants, the probability of misidentification is much greater than that of Class II variants being misidentified, and the probability of misidentification of Class II variants is much greater than that of Class III variants. Therefore, in order to reduce the misidentification rate, the preparation process of this embodiment, in addition to including the steps of any of the above embodiments, further includes the steps: When it is identified that at least one rib protrusion on the lower die base has undergone Class I and / or Class II deformation, trigger the scanning device to perform scanning again to obtain a secondary scanned image, and perform image analysis on it to obtain at least one of the deformation grade, the proportion of the deformed rib protrusions, and the position information of the deformed rib protrusions; and compare the results of the two analyses: If the proportions are different, it indicates that there is a misjudgment (for example, the proportion analyzed from the secondary scanning result is less than the proportion analyzed from the first scanning result) or a missed inspection (for example, the proportion analyzed from the secondary scanning result is greater than the proportion analyzed from the first scanning result), and manual verification is reminded; 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 its deformation grade and position information are recorded; 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 that there is a misjudgment, and manual verification is reminded.

[0100] Of course, in order to reduce the system calculation amount, scanning can also be performed only on a 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 the analysis results of the specified area are compared. 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 a misjudgment.

[0101] Embodiment 7: 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.

[0102] Referring to Figure 6 , the heat sink in 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. A nano-carbon heat dissipation coating is provided on the outer side surface (the side away from the PCB and the chips on the PCB board) of the heat dissipation body 200.

[0103] In some embodiments, the shielding frame 201 is formed by enclosing at least one arched rib 201-1 formed by stamping. Each arched rib 201-1 is uniformly provided with a nickel-carbon rubber strip that can contact and conduct with the exposed copper surface reserved on the bottom surface of the PCB board, and the nickel-carbon rubber strip has been cured.

[0104] Preferably, referring 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.

[0105] 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, referring 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 rib II and the arched rib 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, referring to Figure 7 and Figure 9 .

[0106] In some other embodiments, referring to Figure 10, on the heat dissipation body 200, corresponding to the circuit board, such as three shielded areas of the PCB board, three shielding frames 201 are respectively arranged, and the three shielding frames 201 are all formed by four arched ribs 201-1 enclosing a quadrilateral frame body. Two of them are rectangular shielding frames; the other is a special-shaped quadrilateral frame body. And, the three shielding frames 201 share one arched rib.

[0107] It should be noted that in this article, 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 also 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 another identical element in the process, method, article or device including that element.

[0108] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-described example methods can be implemented by means of software plus a necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is a better implementation. Based on such an 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 disc), and includes several instructions for causing a computer terminal (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in various embodiments of the present invention.

[0109] 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 and scope protected by the claims of the present invention. These all fall within the protection scope of the present invention.

Claims

1. A process for preparing a heat sink with shielding function for a PCB board, characterized in that: Includes steps: S101, raw material cutting: cut 1070 / 1060 aluminum plates with a thickness of 2.0MM-2.5MM into preset sizes and shapes; S102, stamping forming: using a stamping die to stamp the 1070 / 1060 aluminum plate multiple times to form a plate-type heat sink with multiple shielding cavities; wherein the stamping speed v is 20-30 times / min; the stamping force is 200 tons-220 tons; and each stamping is performed so that the upper die seat and the lower die seat of the stamping die are completely closed, and then the next stamping is performed after reaching a preset saturation time threshold; the preset saturation time threshold is 2-3s; S103, trimming: remove excess burrs to ensure smooth edges of products; S104, nano-carbon heat dissipation spraying: spraying a nano-carbon heat dissipation coating on the outer side of the radiator; S105, evenly disposing conductive glue for contacting and conducting with the exposed copper surface reserved on the bottom surface of the PCB board on the arched ribs obtained by stamping, and then heating to solidify it, so that when the plate heat sink is mounted on the PCB board, a closed shielding cavity is formed between the shielding cavity and the bottom surface of the PCB board; wherein, the heating makes the highest temperature zone in the curing process of the conductive glue be 150°C, and the heating in the highest temperature zone is 30 minutes; wherein, a plurality of shielding cover molding areas are arranged on the lower mold base, and the edge of each of the shielding cover molding areas is surrounded by a plurality of rib protrusions, and the bottom of the upper mold base is provided with a punching groove corresponding to each of the rib protrusions that can cooperate with the rib protrusions; Wherein, after the first stamping in step S102 and before the second stamping, the following steps are also included: S301, scanning the aluminum plate using a scanning device to obtain a scanned image of the aluminum plate after the first stamping; S302, performing 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, executing step S303; if only level I deformation occurs, executing step S307; if any arched rib is deformed to level III, executing step S305; if only level II deformation occurs, and the proportion K1 of all arched ribs on the aluminum plate that are deformed to level II is less than or equal to the first preset proportion threshold K01, executing Step S306; if both level I deformation and level II deformation occur at the same time, and the proportion K3 of the sum of all the arched ribs with level I deformation and the arched ribs with level II deformation on the aluminum plate is less than the third preset proportion threshold K03, and the proportion K4 of the arched ribs with level 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, perform the next stamping until the stamping is completed, and execute step S103; S304, reducing the deceleration gradient, and executing step S303; S305, stop stamping and notify to replace the aluminum plate; S306, stop stamping and conduct manual inspection; S307, determining whether the position of the deformed arched rib corresponds to the position of the deformed rib protrusion recorded in advance on the die base, if so, executing step S304; otherwise, executing step S308; S308, determining whether there is a common arched rib among the deformed arched ribs, or whether two connected arched ribs are deformed at the same time, if so, executing step S306, otherwise, executing step S304.

2. The process for preparing a heat sink with shielding function for a PCB board according to claim 1, characterized in that: If the stamping is preset to be 3 times, before executing step S301, the following steps are also included: Scanning the aluminum plate using a scanning device to obtain a scanned image of the aluminum plate after the first stamping; Performing image analysis on the scanned image to obtain the actual height of each of the arched ribs; Determining whether the actual height of each of the arched ribs 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 threshold value, executing steps S301 to S307; If the proportion P1 of the arched ribs whose actual height does not reach the first height is greater than or equal to a first preset threshold value, a prompt is given to adjust the punching intensity and / or the punching speed.

3. The process for preparing a heat sink with shielding function for a PCB board according to claim 2, characterized in that: In step S102, stamping is performed three times, and stamping is performed in a gradient deceleration manner during the three stamping processes. Specifically, the steps include: S1021, during the first punching, punching is performed at a first punching speed V1, and saturation is performed for 2s-3s after punching; wherein V1=200mm / s; S1022, during the second stamping, stamping is performed at a second stamping speed V2, and saturation is performed for 2s-3s after stamping; wherein V2=150mm / s; S1023, during the third stamping, stamping is performed at a third stamping speed V3, and after saturation for 2s-3s after stamping, the upper die seat is controlled to leave the lower die seat at a preset return speed; wherein V3=100mm / s.

4. The process for preparing a heat sink with shielding function for a PCB board according to claim 1, characterized in that: When the number of stamping times in step S102 is greater than 3, stamping is performed in a gradient deceleration manner, and before the last two stampings, the following steps are further included: S401, scanning the aluminum plate using a scanning device to obtain a scanned image of the aluminum plate after the last stamping; S402, performing image analysis on the scanned image to obtain an actual height of each of the arched ribs; S403, judging 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 standard threshold, executing 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 standard threshold, and before stamping, it is pre-determined that the rib protrusion in the lower die seat has a grade I deformation, executing step S405; S404, controlling the mold to perform the next stamping, and executing steps S301-S308; S405, performing image analysis based on the scanned image in step S401 to identify whether the arched ribs on the aluminum plate are deformed. If no deformation occurs, executing step S404; if only level I deformation occurs, and the arched ribs with level I deformation do not include the common arched ribs, executing step S406; if any arched rib undergoes level III deformation, executing step S407; if only level II deformation occurs, and the proportion K1' of the rib protrusions with level II deformation is greater than the first preset proportion threshold K01', executing step S408; If both level I and level II deformation occur at the same time, wherein the proportion K3' of the sum of the arched ribs with level I deformation and the arched ribs with level II deformation is less than the third preset proportion threshold K03', and wherein the proportion K4' of the arched ribs with level 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 is no common arched rib 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 manual inspection.

5. The process for preparing a heat sink 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: ； Where 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, which 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 mold; k t The sensitivity of 1070 / 1060 aluminum plate thickness to the deceleration gradient.

6. The process for preparing a heat sink with shielding function for a PCB board according to claim 4, characterized in that: Before step S102, the method further includes the following steps: S201, scanning the lower die base by using a scanning device to obtain a scanned image of the lower die base; S202, performing image analysis on the scanned image to obtain a deformation grade of each rib protrusion on the lower die base and a proportion of the deformed rib protrusions; If any rib protrusion undergoes grade III deformation, execute step S203; If no rib protrusion has grade III deformation, but at least one rib protrusion around any shielding cover molding area has deformation, execute step S204 or S205; S203, notifying to replace the lower die base; S204, if two connected 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 undergoes grade I deformation, determine whether the deformed rib protrusion is a common rib protrusion, if so, notify to replace the mold, otherwise, execute step S206; S206, recording the position information of the protrusion of the grade I deformed rib, and executing step S102.

7. A process for preparing a heat sink with shielding function for a PCB board according to any one of claims 1 to 6, characterized in that: The level III deformation of the rib protrusion includes an angle between the axial direction of the rib protrusion and the direction perpendicular to the upper surface of the lower mold base being greater than 10°.

8. A process for preparing a heat sink with shielding function for a PCB board according to any one of claims 1 to 6, characterized in that: The II-level deformation of the rib protrusion includes that the angle between the axial direction of the rib protrusion and the direction perpendicular to the upper surface of the lower mold base is less than 10°, but greater than 2°.

9. A process for preparing a heat sink with shielding function for a PCB board according to any one of claims 1 to 6, characterized in that: The rib protrusion undergoes a grade I deformation, including an angle between the axial direction of the rib protrusion and a direction perpendicular to the upper surface of the lower die base being less than 2°, but greater than 0°.

10. A heat sink with shielding function for a PCB board, characterized in that: The heat sink is prepared by the preparation process described in any one of claims 1 to 9, and comprises a heat sink body, at least one shielding cover arranged on the heat sink body and a shielding frame around the heat sink body, and a nano-carbon heat sink coating is arranged on the outer surface of the heat sink body; The shielding frame is formed by enclosing at least one arched rib formed by stamping, each of the arched ribs is provided with a conductive glue that can contact and conduct with the exposed copper surface reserved on the bottom surface of the PCB board, and the conductive glue is cured; and at least two shielding frames share one arched rib.

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