Method for improving residual glue of steel plate pressed by multiple layers of rivet plates and riveting system

Abstract

The invention discloses a multi-layer rivet plate press-fit steel plate residual glue improving method and a riveting system, and the multi-layer rivet plate press-fit steel plate residual glue improving method comprises the following steps: S100, selecting the diameter of a punching drilling tool according to the number of pre-stacked PP sheets of a laminated structure: when the number of the pre-stacked PP sheets is one, punching the PP by adopting the drilling tool with the diameter of 4.0 + / -0.05 mm; when the number of the pre-stacked PP is larger than or equal to 2 or the number of the outer-layer copper foil is smaller than or equal to 1oz, a drilling tool with the diameter being 5.5 + / -0.05 mm is adopted for punching the PP; s200, a riveting height compensation value delta H is set to be equal to-0.4 + / -0.1 mm, so that the height of the top end of the rivet meets the condition that Hrivet = Hlaminated plate + delta H, and then riveting operation is conducted; s300, carrying out fool-proof detection on the laminated plate after riveting; and S400, the qualified laminated plate is fed into a pressing machine to be pressed for 90-120 minutes, and polishing is conducted after pressing. By applying the method for improving the residual glue on the steel plate surface after lamination of the multiple layers of rivet plates, the residual glue on the steel plate surface after lamination of the multiple layers of rivet plates can be effectively reduced, and the product quality and the production efficiency are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit board production, in particular to a multi-layer rivet plate pressing steel plate residual glue improvement method and a riveting system. BACKGROUND

[0002] In the pressing production process of the multi-layer rivet plate, the residual glue of the pressed steel plate is a common and influential problem. The multi-layer rivet plate is usually made by riveting multiple layers of materials through rivets and then feeding into a press for pressing. Among them, PP (prepreg) is an important interlayer bonding material, and its performance and processing method have a key influence on the pressing quality.

[0003] In related technologies, when pre-laminating PP sheets according to the laminated structure, the diameter of the punching drill is not reasonably selected according to the number of PP sheets and the thickness of the outer copper foil. When the number of pre-laminated PP sheets is different or the thickness of the outer copper foil is different, using a uniform specification of drill for punching will cause uneven flow of PP sheets in the subsequent pressing process, and excessive overflow of PP glue in some areas. Moreover, the riveting height setting is not reasonable, and the actual thickness of the laminated plate and the deformation during the pressing process are not fully considered. If the riveting height is too high, the rivets cannot effectively fix the laminated plate during the pressing process, causing interlayer sliding and PP glue overflow; if the riveting height is too low, it may cause excessive extrusion of the laminated plate, causing PP glue to be extruded from the edge, which will also produce residual glue on the surface of the steel plate. SUMMARY

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a multi-layer rivet plate pressing steel plate residual glue improvement method, which can effectively reduce the residual glue on the surface of the steel plate after pressing the multi-layer rivet plate, and improve the product quality and production efficiency.

[0005] The present application also proposes a riveting system for applying the above-mentioned multi-layer rivet plate pressing steel plate residual glue improvement method.

[0006] The multi-layer rivet plate pressing steel plate residual glue improvement method according to the first aspect embodiment of the present application comprises the following steps: S100: Select the diameter of the punching drill according to the number of pre-laminated PP sheets: when there is 1 PP sheet, use a drill with a diameter of 4.0±0.05mm to punch the PP; when there are ≥2 PP sheets or the outer copper foil is ≤1oz, use a drill with a diameter of 5.5±0.05mm to punch the PP; S200: Set the riveting height compensation value ΔH=-0.4±0.1mm, so that the height of the rivet tip satisfies: H 铆钉 =H 叠层板 +ΔH, and then perform riveting operation; S300: After riveting, carry out foolproof detection on the laminated plate; S400: Send the qualified laminated plate into the press for 90-120 minutes, and polish after pressing.

[0007] The multi-layer rivet plate pressing steel plate residual glue improvement method according to the embodiment of the application has at least the following beneficial effects: by reasonably selecting the punching drill bit diameter according to the number of pre-laminated PP sheets and the thickness of the outer copper foil, and setting a suitable riveting height compensation value, the PP sheets can flow uniformly during pressing, and the overflow of PP glue caused by excessive local pressure or excessive extrusion is avoided, thereby significantly reducing the residual glue on the surface of the steel plate after pressing of the multi-layer rivet plate, and improving the quality of the surface of the steel plate. In addition, the anti-fool detection link is added after riveting, which can timely find and remove the riveting defective products, prevent these defective products from entering the subsequent pressing process, reduce the problems of interlayer sliding and glue overflow caused by riveting defects, further improve the pressing quality of the multi-layer rivet plate, and ensure the reliability and stability of the product. In addition, the optimized pressing process parameters and polishing treatment make the pressing process more stable, reduce the rework and scrap caused by residual glue problems, improve the production efficiency, and reduce the production cost. At the same time, the application of the automatic anti-fool detection equipment also improves the detection efficiency and accuracy, and further improves the overall production efficiency.

[0008] According to some embodiments of the application, in the step S100, when the thickness of the outer copper foil is less than or equal to 1 oz, a 5.5 mm drill bit is forced to punch.

[0009] According to some embodiments of the application, in the step S100, the 4.0 mm drill bit is dedicated to the Core+ single PP laminated structure of six layers and above.

[0010] According to some embodiments of the application, in the step S100, a light core plate is covered on the surface of the PP before punching to enhance the rigidity, eliminate the hole burr and dead glue.

[0011] According to some embodiments of the application, in the step S200, it further includes real-time monitoring of the uniformity of rivet blooming, automatic stop and alarm when the blooming is uneven, and the laminated plate intercepted by the alarm needs to be manually rechecked for the uniformity of rivet blooming and the residual glue of the PP hole.

[0012] According to some embodiments of the application, in the step S200, ΔH is preferably -0.4 mm.

[0013] According to some embodiments of the application, in the step S200, the service life control of the punching drill bit is less than or equal to 1500 holes per bit, and the service life of the punch pin is less than or equal to 40,000 times of riveting.

[0014] According to some embodiments of the application, the step S300 includes the following steps: S310: Weigh the single PP to obtain W p; S320: Obtain the first qualified riveted plate and weigh to obtain W s ; S330: After riveting, weigh the laminated plate, if the difference between the measured weight W m and W s exceeds the weight of a single PP sheet W p , an alarm is intercepted.

[0015] According to some embodiments of the present application, in the step S400, the conditions for pressing are met: First stage: 80-120℃ temperature rise, pressure 50-100psi; Second stage: 150-180℃ constant temperature, pressure 200-300psi; Third stage: 180-200℃ curing, pressure 300-400psi.

[0016] According to the riveting system of the second aspect of the present application, the method for improving the residual glue of the riveted steel plate is applied, and the method is characterized in that it comprises a double-head drilling machine module, an intelligent riveting device, a foolproof weighing unit and a hot press unit; wherein the double-head drilling machine module is provided with a 4.0mm / 5.5mm drill bit automatic switching mechanism, and the intelligent riveting device is provided with a height compensation servo module.

[0017] According to the riveting system of the present application, at least the following beneficial effects are achieved: the double-head drilling machine module, the intelligent riveting device, the foolproof weighing unit and the hot press unit are integrated together, realizing the automation and intelligentization of the riveted steel plate pressing production process. The automatic switching mechanism of the double-head drilling machine module can quickly and accurately select the appropriate drill bit according to different requirements, improving the punching efficiency and precision; the height compensation servo module of the intelligent riveting device can accurately control the riveting height, ensuring the riveting quality; the foolproof weighing unit can timely find abnormal conditions in the riveting process, avoiding unqualified products entering the subsequent process; the hot press unit operates according to accurate pressing conditions, ensuring the pressing quality of the riveted steel plate. Through the effective combination of these functions, the riveting system can significantly reduce the residual glue on the surface of the riveted steel plate, improve the production efficiency and quality stability of the product, and reduce the production cost.

[0018] Additional aspects and advantages of the present application will be partially given in the following description, partially will become apparent from the following description, or will be understood by those skilled in the art through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present application will be further described below in combination with the drawings and examples, wherein: Figure 1 It is a flowchart of the method for improving the residual glue of the riveted steel plate of the present application. Figure 2 For Figure 1 A specific flowchart of step S300 shown in the figure; Figure 3 A schematic diagram of the riveting system of the embodiment of the present application. DETAILED DESCRIPTION

[0020] Embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below are examples for explaining the present application and should not be construed as limiting the present application.

[0021] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation on the present application.

[0022] In the description of the present application, the meaning of several is one or more, and the meaning of multiple is two or more. Greater than, less than, more than, etc. are understood as not including the number, and above, below, etc. are understood as including the number. If it is described as first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of indicated technical features.

[0023] In the description of the present application, unless otherwise explicitly defined, the words setting, installing, connecting, etc. should be understood broadly, and the skilled in the art can determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution. In the description of the present application, the description referring to the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner. In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0024] With reference to Figure 1 The present application proposes a multi-layer rivet plate pressing steel plate residual glue improvement method, comprising the following steps: S100: Select the diameter of the punching drill according to the number of pre-stacked PP sheets of the laminated structure: when the pre-stacked PP is 1 sheet, a 4.0±0.05mm diameter drill is used to punch the PP; when the pre-stacked PP is ≥2 sheets or the outer copper foil is ≤1oz, a 5.5±0.05mm diameter drill is used to punch the PP; S200: Set the riveting height compensation value ΔH=-0.4±0.1mm, so that the top end height of the rivet satisfies: H 铆钉 =H 叠层板 +ΔH, and then perform riveting operation; S300: After riveting, the laminated plate is subjected to foolproof detection; S400: The qualified laminated plate is sent into the press for pressing for 90-120 minutes, and after pressing, polishing is performed.

[0025] Specifically, when the pre-stacked PP is 1 sheet, a drill bit with a diameter of 4.0 ± 0.05 mm is used to punch the PP. This is because the single PP sheet is relatively thin, and using a drill bit with a smaller diameter for punching can ensure the accuracy of the punching, while allowing the PP sheet to flow uniformly during the pressing process, reducing the overflow of glue. When the pre-stacked PP is ≥ 2 sheets or the outer layer copper foil is ≤ 1 oz, a drill bit with a diameter of 5.5 ± 0.05 mm is used to punch the PP. When the number of pre-stacked PP sheets is large, the total amount of PP glue increases, and a larger diameter drill bit is needed to punch to ensure that the PP glue has enough space to flow during the pressing process, avoiding excessive glue overflow due to excessive local pressure. When the outer layer copper foil is ≤ 1 oz, the copper foil is relatively thin, and the supporting effect on the PP sheet is relatively weak, so a larger diameter drill bit is also needed to punch to meet the pressing requirements in this case.

[0026] In particular, the rivet height compensation value is set to consider the deformation of the laminated plate during the pressing process. By setting the rivet tip height to Hlaminated plate + ΔH, where ΔH = -0.4 ± 0.1 mm, the rivet can effectively fix the laminated plate during riveting without causing excessive compression of the laminated plate. During the pressing process, the laminated plate will undergo some compression deformation, and the appropriate riveting height can ensure that the rivet always has appropriate pressure on the laminated plate, preventing interlayer sliding, while preventing PP glue from being squeezed out of the edges, thereby reducing the residual glue on the surface of the pressed steel plate.

[0027] It can be understood that the foolproof detection can timely find poorly riveted products, such as loose rivets and riveting position deviation. By setting a foolproof detection device or using manual detection, the laminated plate after riveting is comprehensively inspected, and unqualified products are removed to avoid entering the subsequent pressing process, thereby reducing the problem of residual glue on the pressed steel plate caused by poor riveting.

[0028] The laminated plate that passes the foolproof detection is sent to the press for pressing, and the pressing time is controlled at 90 - 120 minutes. The appropriate pressing time can ensure that the PP sheet is fully cured, and the layers are firmly bonded. After pressing, the surface of the pressed steel plate is polished to remove any residual glue and burrs that may be present, further improving the flatness and smoothness of the steel plate surface.

[0029] In a specific embodiment, in a certain multi-layer riveted plate production, the number of pre-stacked PP sheets is 1. According to the method of the present application, a drill bit with a diameter of 4.0 mm is selected to punch the PP. During the punching process, the rotational speed and feed speed of the drill bit are strictly controlled to ensure the quality and accuracy of the punching. The actual thickness H 叠层板 of the laminated plate is measured to be 3.5 mm, and the rivet height compensation value ΔH is set to -0.4 mm, so the rivet tip height H 铆钉= 3.5 + (-0.4) = 3.1 mm. Then riveting operation is performed according to the height, and special riveting equipment is used to ensure that the rivet is firmly riveted on the laminated plate. After riveting is completed, the laminated plate is detected by combining manual visual detection and simple mechanical detection. Whether the rivet is loose or the riveting position is accurate is checked, and the unqualified products detected are reworked or scrapped. The qualified laminated plate is sent to the press for pressing, and the pressing time is 100 minutes. After pressing is completed, the surface of the steel plate is polished using sandpaper to remove the residual glue and burrs on the surface, so that the surface of the steel plate is smooth and flat.

[0030] In another production of the multilayer riveted plate, the number of pre-laminated PP sheets is 3, and the thickness of the outer copper foil is 0.5 oz (≤1 oz). According to the method of the present application, a drill bit with a diameter of 5.5 mm is selected to punch the PP. Similarly, the stability of the operation parameters is ensured during the punching process to ensure the punching quality. The actual thickness H of the laminated plate is 4.2 mm, and the riveting height compensation value ΔH = -0.3 mm (in the range of ΔH = -0.4 ± 0.1 mm) is set, so the rivet tip height H = 4.2 + (-0.3) = 3.9 mm. Riveting operation is performed according to the height to ensure riveting quality. Then an automatic foolproof detection device is used to detect the riveted laminated plate. The device can quickly and accurately detect riveting defective products and automatically sort out unqualified products through sensors and image recognition technology. The qualified laminated plate is sent to the press for pressing, and the pressing time is 110 minutes. After pressing is completed, the surface of the steel plate is polished using an electric polisher to improve polishing efficiency and surface quality.

[0031] It is easy to understand that by reasonably selecting the diameter of the punching drill bit according to the number of pre-laminated PP sheets and the thickness of the outer copper foil, and setting a suitable riveting height compensation value, the PP sheets can flow uniformly during the pressing process, avoiding excessive local pressure or excessive extrusion that causes PP glue to overflow, thereby significantly reducing the residual glue on the surface of the steel plate after the multilayer riveted plate is pressed, and improving the quality of the steel plate surface. After riveting, the foolproof detection link is added, which can timely detect and remove riveting defective products, prevent these defective products from entering the subsequent pressing process, reduce the problems of interlayer sliding and glue overflow caused by riveting defects, and further improve the pressing quality of the multilayer riveted plate, ensuring the reliability and stability of the product. In addition, the optimized pressing process parameters and polishing treatment make the pressing process more stable, reduce the rework and scrap due to residual glue problems, improve the production efficiency, and reduce the production cost. At the same time, the application of the automatic foolproof detection device also improves the detection efficiency and accuracy, further improving the overall production efficiency.

[0032] Further, when the production process of the multi-layer rivet plate enters step S100, the operator first uses a professional copper foil thickness measuring instrument, such as a micrometer, to accurately measure the thickness of the outer copper foil of the laminated plate. If the measurement result shows that the thickness of the outer copper foil is less than or equal to 1 oz, then in the subsequent PP sheet punching operation, a drill bit with a diameter of 5.5 mm must be unconditionally selected. During the punching process, the rotational speed of the drill bit must be stabilized within a suitable range, for example, 800-1000 revolutions per minute, and the feed speed must be controlled within 0.5-1 mm / s, in order to ensure the quality and precision of the punching. At the same time, the wear of the drill bit must be checked regularly, and if the drill bit is found to be worn or damaged, a new 5.5 mm drill bit must be replaced for punching operation.

[0033] It can be understood that when the thickness of the outer copper foil is ≤1 oz, the copper foil is relatively thin and has a weak supporting effect on the PP sheet. If a drill bit with a smaller diameter is used for punching, the PP glue may be squeezed out in large quantities from the edge during the pressing process due to uneven pressure, resulting in an increase in residual glue on the surface of the pressed steel plate. However, the use of a 5.5 mm drill bit for punching can increase the punching area of the PP sheet, allowing the PP glue to have more space to flow during pressing, thereby avoiding excessive glue overflow caused by excessive local pressure, effectively reducing the residual glue on the surface of the pressed steel plate, and improving the quality of the product.

[0034] Further, when the production process of the multi-layer rivet plate enters step S100, the operator first identifies the structure of the laminated plate. By checking the production order and the design drawings of the laminated plate, it is determined whether the laminated plate is a Core+ single PP laminated structure of six or more layers. If it is this specific structure, then only a drill bit with a diameter of 4.0 mm can be used for punching. Before punching, the 4.0 mm drill bit is checked and adjusted to ensure that its dimensional accuracy meets the requirements and that the cutting edge is sharp and free of wear. During the punching process, the punching parameters must be strictly controlled, such as setting the rotational speed of the drill bit to 1200-1500 revolutions per minute and the feed speed to 0.3-0.6 mm / s, in order to ensure the quality of the punching. At the same time, the used 4.0 mm drill bit must be recorded and managed, and regular maintenance and replacement must be performed.

[0035] It can be understood that the Core+ single PP laminated structure of six or more layers has its particularity, and its interlayer bonding and pressure distribution are different from those of other structures. The use of a 4.0 mm drill bit for this structure can accurately control the punching size of the PP sheet according to the characteristics of the structure. A smaller punching diameter can allow the PP sheet to better fill the interlayer gap during pressing, ensuring the uniformity and firmness of the interlayer bonding and avoiding the problem of residual glue caused by uneven flow of PP glue due to excessive punching, thereby improving the pressing quality of the multi-layer rivet plate and the performance of the product.

[0036] In some embodiments, before the punching step of the multi-layer rivet plate production enters step S100, the operator first prepares a light core plate of appropriate size to ensure that the light core plate can completely cover the PP surface. Place the light core plate flat on the PP sheet, and use a special clamp to fix the light core plate and PP sheet together to prevent movement during the punching process. Then use a drill to punch, and the punching parameters are set reasonably according to the material and thickness of the PP sheet. After punching, carefully check the hole condition, and use fine sandpaper or a special deburring tool to polish and clean the burrs and dead glue, ensuring that the hole is smooth and flat.

[0037] It can be understood that the PP sheet itself is relatively weak in rigidity and is prone to deformation during punching, resulting in burrs and dead glue at the hole. These burrs and dead glue will become a source of residual glue during the subsequent pressing process, affecting the quality of the pressed steel plate surface. Covering the PP surface with a light core plate can enhance the rigidity of the PP sheet, reduce deformation during punching, and effectively eliminate hole burrs and dead glue. This can ensure that the PP sheet can better combine with other layers during pressing, reduce glue overflow, improve the pressing quality of the multi-layer rivet plate, and reduce the probability of residual glue.

[0038] Further, in some embodiments, a high-precision visual detection system is installed on the intelligent riveting device. The visual detection system can capture real-time images of the rivet blooming state, and analyze and judge the uniformity of the rivet blooming through image processing algorithms. When uneven rivet blooming is detected, the system immediately sends a signal to control the intelligent riveting device to automatically stop and trigger an alarm device, such as a sound and light alarm, to issue an alarm. At the same time, the system records the alarm information and intercepts the corresponding laminated plate. After receiving the alarm, the operator manually rechecks the intercepted laminated plate, carefully checks the uniformity of the rivet blooming, and checks whether there is residual glue around the PP hole. If a problem is found, the laminated plate is adjusted or processed in a timely manner. It can be understood that the uniformity of the rivet blooming has an important influence on the pressing quality of the multi-layer rivet plate. If the rivet blooming is uneven, it will cause uneven pressure distribution between the layers during pressing, causing excessive overflow of PP glue in some areas, thereby producing residual glue. By monitoring the uniformity of the rivet blooming in real time and automatically stopping and alarming when the blooming is uneven, problems that occur during riveting can be detected in a timely manner, and unqualified products can be prevented from entering the subsequent pressing process. Manual rechecking can further ensure accurate judgment and processing of problems, thereby effectively reducing the problem of residual glue on the pressed steel plate caused by poor riveting, improving the qualification rate of the product, and improving the quality stability.

[0039] When the multi-layer rivet plate production enters step S200, the operator sets the riveting height compensation value ΔH according to the actual thickness H of the laminated plate. On the operation interface of the device, set the value of ΔH to -0.4 mm, and then the device calculates the riveting height H according to the formula H铆钉 =H 叠层板 The automatic calculation of the rivet tip height and riveting operation. During the riveting process, the equipment will monitor the riveting height in real time to ensure that it meets the set value. At the same time, the intelligent riveting equipment is calibrated and maintained regularly to ensure the accuracy of the riveting height compensation value.

[0040] It should be noted that through a large number of experiments and production practice verification, when ΔH is set to -0.4mm, it can best adapt to the deformation of the laminated plate during the pressing process. This specific compensation value can effectively fix the laminated plate during riveting, without causing excessive extrusion to the laminated plate. During the pressing process, the laminated plate will undergo certain compression deformation, and the appropriate riveting height can ensure that the rivet always has appropriate pressure on the laminated plate, preventing interlayer sliding, while avoiding the extrusion of PP glue from the edge, thereby significantly reducing the residual glue on the surface of the pressed steel plate and improving the pressing quality and stability of the product.

[0041] In some embodiments, during the production process of multi-layer riveted plate, a detailed usage record file is established for each punching drill and each punch pin. When using the punching drill for punching operation, the operator accurately records the number of punches in the record file. When the number of punches of a certain punching drill reaches 1500, the drill is immediately stopped and replaced with a new one. Similarly, for the punch pin, the number of riveting is recorded each time the riveting operation is performed. When the number of riveting of the punch pin reaches 40,000 times, a new punch pin is replaced in time. At the same time, the used drills and punch pins are regularly inspected and evaluated, and their service life standards are adjusted appropriately according to the actual situation. As the number of uses of the punching drill and the punch pin increases, the degree of wear will gradually increase, resulting in a decrease in the quality of punching and riveting. For example, a worn drill may cause the size of the punch hole to increase or the shape to be irregular, and a worn punch pin may cause the riveting to be insecure or the rivet to bloom unevenly. These problems will affect the processing quality of the PP sheet and the riveting effect of the laminated plate, thereby increasing the probability of residual glue on the surface of the pressed steel plate. By strictly controlling the service life of the punching drill ≤ 1500 holes per drill and the service life of the punch pin ≤ 40,000 riveting, the quality of punching and riveting can be ensured to be in good condition at all times, reducing quality problems caused by tool wear, thereby effectively reducing the residual glue on the surface of the pressed steel plate and improving the production quality and stability of the product.

[0042] Reference Figure 2 The foolproof test on the laminated plate after riveting includes the following steps: S310: Weighing a single PP to obtain W p ; S320: Obtaining a qualified riveted plate and weighing to obtain W s ; S330: Weighing the laminated plate after riveting, if the measured weight Wm The difference between W s and W p exceeds the weight of a single PP sheet W

[0043] Specifically, when the multi-layer rivet plate production enters step S300, first use a high-precision electronic balance to weigh the single PP sheet, and accurately record its mass W p . Then, select the first riveted plate that has passed strict detection, and also use an electronic balance to weigh it, obtaining the mass of the first qualified riveted plate W s . In the subsequent riveting production process, weigh each riveted laminated plate to obtain the measured weight W m . Compare the measured weight W m with the mass of the first qualified riveted plate W s , and calculate their difference. If the difference exceeds the weight of a single PP sheet W p , it indicates that there may be excessive PP glue overflow or other abnormal conditions during riveting. At this time, the device automatically triggers the alarm device, such as flashing the alarm light and sounding the alarm, and intercepts the laminated plate. After receiving the alarm, the operator checks and handles the intercepted laminated plate, finds out the problem cause and makes adjustments.

[0044] By weighing the riveted laminated plate, the use and overflow of PP glue during riveting can be directly reflected. If the difference between the measured weight and the weight of the first qualified riveted plate exceeds the weight of a single PP sheet, it indicates that there may be a problem of abnormal overflow of PP glue, which is often one of the important reasons for the residual glue on the surface of the pressed steel plate. Through the alarm interception function, these unqualified products can be found in time to avoid entering the subsequent pressing process, thereby effectively reducing the residual glue problem of the pressed steel plate caused by abnormal riveting, improving the quality stability and production efficiency of the product.

[0045] In some embodiments, the qualified laminated plate is put into the hot press group when the multi-layer rivet plate production enters the pressing operation of step S400. The hot press group performs the pressing operation according to the preset program, which is divided into three stages. In the first stage, the hot press group increases the temperature from room temperature to 80-120°C at a certain rate, while applying a pressure of 50-100 psi, so that the laminated plate is gradually heated and pressed, and the PP sheet begins to soften. In the second stage, the temperature is kept constant at 150-180°C, while the pressure is increased to 200-300 psi, so that the PP sheet further flows and fills the interlayer gap, achieving better bonding. In the third stage, the temperature is increased to 180-200°C for curing treatment, while the pressure is increased to 300-400 psi, so that the PP sheet is fully cured and the layers are firmly bonded. In each stage, temperature and pressure sensors are used to monitor the temperature and pressure in the hot press group in real time to ensure that they meet the set values.

[0046] It should be noted that different pressing stages have different requirements for temperature and pressure. By precisely controlling the temperature and pressure conditions of pressing in stages, the PP sheet can achieve the best flow and curing effect during the pressing process. The low temperature and low pressure in the first stage can gradually soften the PP sheet, avoiding premature overflow of the PP glue due to excessive temperature or pressure. The medium temperature and medium pressure in the second stage can make the PP sheet flow fully and fill the interlayer gap, ensuring the uniformity and firmness of the interlayer bonding. The high temperature and high pressure in the third stage can make the PP sheet fully cured, further improving the interlayer bonding strength. This precise control of pressing conditions can effectively reduce the abnormal overflow of PP glue during the pressing process, thereby reducing the residual glue on the surface of the pressed steel plate and improving the pressing quality and product performance of the multi-layer rivet plate.

[0047] Referring to Figure 3The second aspect of the present application also proposes a riveting system for applying the multi-layer rivet plate and steel plate residual glue improvement method as claimed in any one of the above, comprising a double-head drilling machine module, an intelligent riveting device, a foolproof weighing unit and a hot press unit. The riveting system is composed of four main parts: the double-head drilling machine module, the intelligent riveting device, the foolproof weighing unit and the hot press unit. The double-head drilling machine module is equipped with two specifications of drill bits, 4.0mm and 5.5mm, and realizes quick replacement of drill bits through an automatic switching mechanism. During production, according to the requirements of step S100 in claims 1-9, the system automatically controls the automatic switching mechanism to select the appropriate drill bit for punching operation according to the structure of the laminated plate and the thickness of the outer copper foil and other information. The intelligent riveting device is provided with a height compensation servo module, which can accurately control the riveting height of the rivet according to the riveting height compensation value ΔH set in step S200, to ensure the riveting quality. The foolproof weighing unit is responsible for weighing the single PP sheet, the first piece of qualified riveting plate and the laminated plate after riveting, and performing quality detection and alarm interception according to the requirements of step S300. The hot press unit performs press bonding treatment on the laminated plate in stages according to the press bonding conditions set in step S400, to ensure the press bonding quality of the multi-layer rivet plate. The entire riveting system is uniformly coordinated and controlled by the central control system to realize automatic production.

[0048] It is easy to understand that the riveting system integrates the double-head drilling machine module, the intelligent riveting device, the foolproof weighing unit and the hot press unit together, realizing the automation and intelligentization of the multi-layer rivet plate press bonding production process. The automatic switching mechanism of the double-head drilling machine module can quickly and accurately select the appropriate drill bit according to different requirements, improving the punching efficiency and accuracy; the height compensation servo module of the intelligent riveting device can accurately control the riveting height, ensuring the riveting quality; the foolproof weighing unit can timely detect abnormal conditions in the riveting process, avoiding unqualified products entering the subsequent process; the hot press unit operates according to accurate press bonding conditions, ensuring the press bonding quality of the multi-layer rivet plate. Through the effective combination of these functions, the riveting system can significantly reduce the residual glue on the surface of the press bonded steel plate, improve the production efficiency and quality stability of the product, and reduce the production cost.

[0049] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the purpose of the present application.

Claims

1. A method for improving the residual adhesive of a multi-layer rivet bonded steel sheet, characterized by, Comprising: S100: Select the punch drill bit diameter according to the number of pre-stacked PP sheets in the laminated structure: when the pre-stacked PP is 1 sheet, use a 4.0±0.05mm diameter drill bit to punch the PP; when the pre-stacked PP is ≥2 sheets or the outer copper foil is ≤1oz, use a 5.5±0.05mm diameter drill bit to punch the PP; S200: Set the riveting height compensation value ΔH=-0.4±0.1mm, so that the rivet tip height satisfies: H 铆钉 =H 叠层板 +ΔH, and then riveting operation is performed; S300: After riveting, the laminated plate is subjected to foolproof detection; S400: The qualified laminated plate is sent into the press for 90-120 minutes, and then polished after pressing.

2. The method for improving the residual adhesive of a multi-layer rivet bonded steel sheet according to claim 1, characterized in that, In the step S100, when the thickness of the outer copper foil is ≤1oz, a 5.5mm drill bit is forced to be used for punching.

3. The method for improving the residual adhesive of a multi-layer rivet bonded steel sheet according to claim 1, characterized in that, In the step S100, the 4.0mm drill bit is used for Core+ single PP laminated structure of six layers and above.

4. The method for improving the residual adhesive of a multi-layer rivet bonded steel sheet according to claim 1, characterized in that, In the step S100, the PP surface is covered with a light core plate before punching to enhance rigidity, eliminate hole burrs and dead glue.

5. The method for improving the residual adhesive of a multi-layer rivet bonded steel sheet according to claim 1, characterized in that, In the step S200, real-time monitoring of rivet blooming uniformity is also included, and when the blooming is uneven, the machine automatically stops and alarms, and the laminated plate intercepted by the alarm needs to be manually rechecked for rivet blooming uniformity and PP hole residual glue.

6. The method for improving the residual adhesive of a multi-layer rivet bonded steel sheet according to claim 1, characterized in that, In the step S200, ΔH is preferably -0.4mm.

7. The method for improving the residual adhesive of a multi-layer rivet bonded steel sheet according to claim 1, wherein In the step S200, the punch drill bit life control is ≤1500 holes per piece, and the punch pin life is ≤40,000 times of riveting.

8. The method for improving the residual adhesive of a multi-layer rivet bonded steel sheet according to claim 1, characterized in that, The step S300 includes the following steps: S310: Weigh the single PP by the quality scale to obtain W p ; S320: Obtain the first qualified riveted plate and weigh to obtain W s ; S330: After riveting, the laminated plate is weighed, and if the measured weight W m differs from the weight W s of a single PP sheet by more than a predetermined value, an alarm is triggered. p ​ 9. The method for improving the residual adhesive of a multi-layer rivet bonded steel sheet according to claim 1, characterized in that, In the step S400, the conditions for pressing are satisfied: First stage: 80-120℃ temperature rise, pressure 50-100psi; Second stage: 150-180℃ constant temperature, pressure 200-300psi; Third stage: 180-200℃ curing, pressure 300-400psi.

10. A riveting system for applying the method for improving the bonding of a steel sheet to a multi-layered rivet sheet residual adhesive layer according to any one of claims 1 to 9, characterized by Comprising: Double-head drill machine module, intelligent riveting equipment, foolproof weighing unit and hot press unit; Among them, the double-head drill machine module has a 4.0mm / 5.5mm drill bit automatic switching mechanism, and the intelligent riveting equipment is provided with a height compensation servo module.

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