Category Archives: Quality selection

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Seoul, March 18 (Reporters Lu Rui and Sun Yiran) The so-called Third Democracy Summit led by the United States was held in Seoul, South Korea from the 18th to the 20th. South Korean citizen groups held a rally in central Seoul on the 18th to protest the so-called democracy summit.

According to local media reports, South Korean citizens ‘group National Popular Action held a press conference near the venue of the Democracy Summit on the same day to express their protest. People held banners that opposed the democracy summit held to maintain U.S. hegemony, and shouted slogans such as the democracy summit spreading false democracy and condemning Yin Yue’s government for blindly following the U.S. -centered value alliance.

Some rally participants said that the United States decided to hold the democracy summit in South Korea. Its intention was very obvious, to maintain its hegemony that was gradually collapsing and push South Korea to the front line of camp confrontation.

South Korea’s “Jingxiang Shimbun” published a commentary on the 17th, saying that the so-called democracy summit with the logic of camp confrontation does not have much support around the world, but South Korea has taken the lead in promoting the new Cold War values of the United States. Whether such an approach will help South Korea’s national interests is questionable.

Under the banner of democracy, the United States held the so-called democracy summit via video in December 2021 and a combination of online and offline in March 2023, which have been widely questioned by the international community.

　　After more than a year of repeated tests and cooperation with seven other collaborators, the high-performance steel team of Shanghai University School of Materials successfully developed the world’s first 19.8-grade ultra-high-strength bolt known as the world’s strongest fastener.more importantly, Auto parts Made a fighter in the product, not afraid of any competitor’s attack. https://www.chinatianlong.com/

　　Through the optimization of materials and heat treatment process, the tensile strength of 16.8 and 19.8 grade bolts at room temperature meets 1600~1770MPa and 1900~2070MPa respectively.

　　The results of shear test (according to GJB 3376-1998) show that the shear force of grade 16.8 and grade 19.8 bolts reaches 97KN and 115KN respectively.

　　The tensile fatigue strength test at room temperature (according to GJB 3376-1998 and GJB715.30A-2002, the load ratio =0.1) shows that the developed fastener meets the fatigue life requirements (the average fatigue life is not less than 65,000 times, and the single fatigue life is not less than 45,000 times).

　　The results of delayed fracture resistance test (according to GJB 715.12-1990, the constant tensile stress was kept for 96 hours in atmospheric environment) showed that the bolt did not break during the test time, and no cracks were found on the bolt surface and thread after unloading. The comprehensive performance of the newly developed ultra-high strength bolt meets the service requirements.

　　Class 16.8 and 19.8 fasteners in kind (specifications are MJ8〜1〜50)

　　Under the same clamping force, the ultra-high strength fastener can reduce its weight and increase the installation space by reducing its own size, so it can optimize the function and volume of the connected parts, so as to achieve the goal of overall weight reduction and performance optimization of the equipment.

　　So what is a high strength bolt? What is the strength of high-strength bolts? Sister Jin brought you here today to find out.

　　one

　　What is a high strength bolt?

　　High-Strength Friction Grip Bolt, literally translated as: high-strength friction preload bolt, abbreviated as HSFG. It can be seen that the high-strength bolt mentioned in Chinese construction is the abbreviation of high-strength friction pre-tightening bolt. In daily communication, only the words “Friction” and “Grip” are briefly mentioned, but it has caused many engineers and technicians to understand the basic definition of high-strength bolts, resulting in misunderstandings.

　　Myth 1:

　　Bolts with material grade over 8.8 are “high strength bolts”?

　　The core difference between high-strength bolts and ordinary bolts is not the strength of the materials used, but the form of stress. The essence is whether to apply pre-tightening force and use static friction to resist shear.

　　In fact, there are only two kinds of high-strength bolts (HSFG BOLT) mentioned in British Standard Specification and American Standard Specification (BS EN 14399/ASTM-A325&ASTM-490), while ordinary bolts include 4.6, 5.6, 8.8, 10.9, 12.9, etc. (BS 3692 11, Table 2) It can be seen that the strength of materials is not the key to distinguish high-strength bolts from ordinary bolts.

　　2?

　　Where is the strength of high-strength bolts?

　　According to GB50017, calculate the tensile and shear strength of a single ordinary bolt (Class B) with Grade 8.8 and a high-strength bolt with Grade 8.8.

　　Through calculation, we can see that the design values of tensile strength and shear strength of ordinary bolts are higher than those of high-strength bolts under the same grade.

　　So where is the “strength” of high-strength bolts?

　　In order to answer this question, it is necessary to study the law of elastic-plastic deformation of two kinds of bolts from the design working state, and understand the limit state of design failure.

　　Stress-strain curves of ordinary bolts and high-strength bolts under working conditions

　　Limit state of design failure

　　Ordinary bolt: the screw itself has plastic deformation exceeding the design allowable, and the screw is sheared.

　　For ordinary bolted connections, there will be relative slip between the connecting plates before they begin to bear shear force, and then the bolt rod will contact with the connecting plates, which will cause elastic-plastic deformation and bear shear force.

　　High-strength bolt: The static friction between the effective friction surfaces is overcome, and the two steel plates are relatively displaced, which is considered as failure in design.

　　When high-strength bolts are connected, the friction bears the shear force first. When the load increases to the point where the friction force is not enough to resist the shear force, the static friction force is overcome and the connecting plates slide relatively (limit state). However, although it is damaged at this time, the bolt rod is in contact with the connecting plate, and it can still bear the shear force by using its own elastic-plastic deformation.

　　Myth 2:

　　High bearing capacity is high strength bolt?

　　From the calculation of a single bolt, it can be seen that the design strength of high-strength bolt in tension and shear is lower than that of ordinary bolt. The essence of its high strength is that during normal operation, the joint is not allowed to slip, that is, the elastic-plastic deformation is small and the joint stiffness is large.

　　It can be seen that the joints designed with high-strength bolts may not necessarily save the number of bolts under the given design node load, but they have small deformation, high stiffness and high safety reserve. It is suitable for the main beam, and other positions that require greater joint stiffness, which conforms to the basic seismic design principle of “strong joints and weak members”.

　　The strength of high-strength bolts lies not in the design value of their own bearing capacity, but in the high stiffness, high safety and strong damage resistance of their designed joints.

　　three

　　Comparison between high strength bolts and ordinary bolts

　　Ordinary bolts and high-strength bolts have great differences in construction inspection methods because of their different design stress principles.

　　The mechanical performance requirements of ordinary bolts of the same grade are slightly higher than those of high-strength bolts, but high-strength bolts have one more acceptance requirement for impact work than ordinary bolts.

　　The marking of ordinary bolts and high-strength bolts is the basic method to identify bolts of the same grade on site. Because the values of torque calculation for high-strength bolts in British and American standards are different, it is necessary to identify the bolts of the two standards.

　　Ordinary bolts are about 70% of the price of high-strength bolts. Combined with the comparison of their acceptance requirements, it can be concluded that the premium part should be to ensure the impact energy (toughness) performance of materials.

　　Although many batteries are not durable now and can only be used for 1~2 years, we can buy more durable batteries if we pay attention to these three points when buying batteries, and it is not a problem to use them for 3~4 years.in fact food delivery bike It is more and more welcomed by our customers, and its market performance is gradually improving. https://www.chamrider.com/

　　Point 1: Try to choose high-end batteries.

　　At present, the batteries of electric vehicles have been divided into three grades, high, middle and low, especially the low-grade batteries. Most of them directly use recycled lead, because the price of this battery is cheap, and battery brands also use this battery to seize the market.

　　Why can the battery of electric vehicle only be used for 2 years? The key to these two reasons is how to buy a durable battery-driving.

　　If you want to choose a durable battery, you need to avoid this low-end battery, but try to choose a high-end battery. High-end batteries often use primary lead, and there are some black technologies, such as graphene batteries, which add alloy materials and graphene, so the battery has better conductivity and longer service life.

　　Point 2: Choose a heavier battery.

　　If you don’t know which battery is better, there is a simpler way, that is, look at the net weight of the battery. Under the premise of the same capacity, which battery is heavier, then this battery is definitely more durable.

　　Why can the battery of electric vehicle only be used for 2 years? The key to these two reasons is how to buy a durable battery-driving.

　　As we all know, the battery of electric vehicle is mainly composed of three parts, namely, battery shell, electrolyte and electrode plate. If the battery with the same capacity is heavier, its electrode plate thickness will increase, so it will be more corrosion-resistant and can make the battery more durable.

　　Point 3: Try to choose a large-capacity battery.

　　When buying an electric car, everyone has a budget within the budget, and choose a battery with large capacity as much as possible, such as the same size. Ordinary lead-acid batteries are only 20Ah, while graphene batteries can reach 23Ah, so this battery can not only run better, but also store more electricity.

　　Why can the battery of electric vehicle only be used for 2 years? The key to these two reasons is how to buy a durable battery-driving.

　　On the one hand, a large-capacity battery can make the electric vehicle run farther, on the other hand, it can also reduce the charging times. We know that the service life of the battery is mainly determined by the number of charging and discharging cycles. If the charging times are reduced, the service life of the battery will be relatively extended.

　　Summary:

　　The battery of electric vehicle is very important. The reason why the battery is not durable in recent years is because of the battery shortage and the use of recycled lead. Therefore, if we want to prolong the service life of the battery and buy a more durable battery, we just need to avoid these problems. Therefore, when buying a durable battery, try to choose a high-end battery, a battery with heavier weight and a battery with larger capacity, which can make your battery last for two years.

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　　In the rapidly evolving world of manufacturing, precision manufacturing services are at the forefront of innovation and technological advancement. These services are essential for producing high-quality components that meet stringent specifications across various industries, including aerospace, automotive, medical devices, and electronics. As we look to the future, several trends are poised to shape the landscape of precision manufacturing services, high precision machining services, and the role of mold core pins manufacturers.

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　　1. Integration of Smart Manufacturing Technologies

　　One of the most significant trends in precision manufacturing services is the integration of smart manufacturing technologies. The Industrial Internet of Things (IIoT), artificial intelligence (AI), and machine learning are being increasingly utilized to enhance production efficiency, quality control, and predictive maintenance. These technologies enable manufacturers to collect and analyze vast amounts of data in real-time, allowing for more informed decision-making and reducing downtime.For instance, AI-driven analytics can predict equipment failures before they occur, ensuring continuous operation and minimizing costly interruptions. This trend is particularly relevant for high precision machining services, where even minor disruptions can lead to significant delays and increased production costs.

　　2. Advanced Materials and Processes

　　The development of advanced materials and processes is another trend that will continue to impact precision manufacturing services. Materials such as carbon fiber composites, advanced ceramics, and high-performance alloys are increasingly being used to create components with superior strength-to-weight ratios, durability, and resistance to extreme environments.

　　Moreover, new manufacturing processes like additive manufacturing (3D printing) and advanced machining techniques are enabling the production of complex geometries that were previously impossible or cost-prohibitive. High precision machining services are now capable of achieving tighter tolerances and more intricate designs, meeting the ever-increasing demands of industries like aerospace and medical devices.

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　　3. Customization and Flexibility

　　As consumer demands become more personalized, manufacturers are under pressure to provide customization without sacrificing efficiency or quality. This trend is driving the adoption of flexible manufacturing systems that can quickly adapt to produce a wide variety of products.Precision manufacturing services are leveraging modular equipment and reconfigurable production lines to offer greater customization options. This flexibility is crucial for mold core pins manufacturers who must produce highly specialized components tailored to specific applications. The ability to quickly switch between different production setups allows these manufacturers to meet diverse customer requirements while maintaining high standards of precision and quality.

　　4. Sustainability and Green Manufacturing Practices

　　Sustainability is an increasingly important consideration for manufacturers worldwide. Precision manufacturing services are no exception, as companies strive to reduce their environmental impact through green manufacturing practices. This includes minimizing waste, reducing energy consumption, and utilizing eco-friendly materials.High precision machining services are adopting sustainable practices by implementing energy-efficient machinery, recycling metal shavings and cutting fluids, and optimizing production processes to minimize waste. Mold core pins manufacturers are also exploring sustainable materials and coatings that extend the lifespan of their products while reducing environmental harm.

　　5. Globalization and Supply Chain Resilience

　　The globalization of supply chains has brought both opportunities and challenges to precision manufacturing services. While access to international markets has expanded, recent disruptions have highlighted the need for resilient supply chains. Manufacturers are investing in strategies to mitigate risks associated with global supply chain dependencies.This includes diversifying suppliers, increasing local production capabilities, and utilizing digital supply chain management tools. For high precision machining services and mold core pins manufacturers, ensuring a reliable supply chain is critical to maintaining consistent quality and meeting delivery deadlines.

　　The advancement of electronic devices has placed a significant demand on the capabilities of printed circuit boards (PCBs). Among the most prominent options are rigid and multilayer printed boards, which have emerged as essential components in modern circuit design. These PCBs are reshaping the future of electronics, offering innovative solutions for complex and high-performance applications.In order to achieve the goal, aluminum base pcb Turn cocoon into butterfly, constantly polish product quality, improve business ability, and finally have a place in the market. https://www.hongmycircuits.com/

　　Understanding Rigid and Multilayer Printed Boards

　　Rigid printed boards are sturdy, inflexible boards commonly used in applications requiring durability and structural integrity. These boards provide a solid foundation for various electronic components and are widely used in consumer electronics, automotive systems, and industrial equipment.

　　On the other hand, multilayer printed boards feature multiple layers of conductive material sandwiched between insulating layers. These boards are compact, versatile, and designed for high-density and high-speed circuits, making them ideal for advanced applications such as telecommunications, aerospace, and medical devices.

　　Rigid and Multilayer Printed Boards Production of Printed Board

　　Advantages of Rigid and Multilayer Printed Boards

　　1.Compact Design

　　Multilayer boards enable the integration of complex circuits within a small footprint, saving space and supporting the trend toward miniaturization in electronics.

　　2.Enhanced Performance

　　The layered structure of multilayer PCBs reduces interference and improves signal integrity, critical for high-speed applications.

　　3.Durability

　　Rigid boards excel in environments that require stability and resistance to mechanical stress.

　　4.Versatility

　　Both rigid and multilayer boards are adaptable to various industries, from consumer electronics to aerospace.

　　Applications Driving Their Adoption

　　The increasing complexity of electronic systems has driven the demand for rigid and multilayer printed boards. For instance:

　　Automotive: Multilayer PCBs power advanced driver-assistance systems (ADAS) and electric vehicle (EV) components.

　　Medical: Rigid boards are used in diagnostic equipment, while multilayer boards are critical in compact medical devices.

　　Telecommunications: Multilayer boards support high-frequency communication devices and data transfer systems.

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According to a report by the Russian News Agency on March 21, Dutch Admiral Robbauer, chairman of the NATO Military Committee, who is visiting Ukraine, said that he is leading the first NATO military delegation to visit the country since the beginning of the Russia-Ukraine conflict.

Reported that Powell said in a speech at a security forum in Kiev that he was leading the first NATO military delegation to visit Ukraine since the outbreak of the Russia-Ukraine conflict.

He said the reason for the visit was that NATO and Ukraine were getting closer than ever before.

Reports said that Russia had previously issued notes to NATO countries regarding their practice of providing weapons to Ukraine. Russian Foreign Minister Lavrov pointed out that any cargo containing weapons for Ukraine will become a legitimate target for Russian troops. The Russian Foreign Ministry said that NATO countries that provide weapons to Ukraine are playing with fire. Russian Presidential Press Secretary Peskov said that Western arms supplies will not help the success of Russia-Ukraine negotiations and will only have a negative impact.

According to a report by the German News TV channel on the 20th, Polish Foreign Minister Sikorski said that Western soldiers are open secrets in Ukraine. He said that as the German Chancellor said, there are already troops from a number of major powers in Ukraine. (Compiled by Liu Yang)

　　The English word for Screw is screw. The meaning of this word has changed greatly in recent hundreds of years. At least in 1725, it means “mating”.So we can draw a preliminary conclusion, mining bolt It is helpful to the needs of the industry market and social development. https://www.chinatianlong.com/

　　The application of the thread principle can be traced back to 220 BC, when the Greek scholar Archimedes created the spiral water lifting tool.

　　In the 4th century A.D., Mediterranean countries began to apply the principle of bolts and nuts to the press for wine making. At that time, the external threads were all wrapped around a cylindrical bar with a rope, and then carved according to this mark, while the internal threads were often formed by hammering with soft materials wrapped around the external threads.

　　Around 1500, in the sketch of thread processing device drawn by Italian Leonardo da Vinci, there was an idea of using mother screw and exchange gear to process threads with different pitches. Since then, the method of mechanical thread cutting has developed in European watch manufacturing industry.

　　In 1760, the British brothers J. Wyatt and W. Wyatt obtained a patent for cutting wooden screws with a special device. In 1778, an Englishman, J. ramsden, made a thread cutting device driven by a worm gear pair, which could process long threads with high precision. In 1797, H. Maudslay, an Englishman, turned metal threads with different pitches on the lathe improved by him, which laid the basic method for turning threads.

　　In the 1820s, Maudslay produced the first batch of taps and dies for thread processing.

　　At the beginning of the 20th century, the development of automobile industry further promoted the standardization of threads and the development of various precise and efficient thread processing methods. Various automatic opening die heads and automatic shrinking taps were invented one after another, and thread milling began to be applied.

　　In the early 1930s, thread grinding appeared.

　　Although the thread rolling technology was patented in the early 19th century, it developed slowly because of the difficulty in mold manufacturing. It was not until the Second World War (1942 ~ 1945) that the demand of ammunition production and the development of thread grinding technology solved the precision problem of mold manufacturing, and it achieved rapid development.

　　Threads are mainly divided into connection threads and transmission threads.

　　For connecting threads, the main processing methods are tapping, threading, turning, rolling and rubbing.

　　For transmission thread, its processing methods are mainly: rough turning-grinding, cyclone milling-rough turning, etc.

　　Today, let’s take a look at the various processing methods of threads with Xiao Bang and see which method is better.

　　In today’s digital age, hotel smart advertising machines are showing diverse and surprising uses, bringing guests a richer, more convenient and enjoyable experience.precisely because interactive board The rapid development of, so also brought new opportunities to the industry. https://kingonevision.com/

　　The diverse uses and charm of hotel smart advertising machines

　　Entertainment Videaos and User-Generated Content

　　Wherever they are, people always crave fun and entertaining elements to participate in. For hotels, if you want to provide entertainment content for guests and light up the atmosphere of the hotel lobby, playing videos or social media playlists on smart advertising machines is a great choice.

　　You can carefully create a travel blog playlist covering the best tourist attractions around the world or in your local area. Not only that, even in the hotel room, you can play exciting and entertaining movies through smart advertising machines, allowing guests to enjoy an audio-visual feast while relaxing.

　　Flight and travel information display

　　In the hotel environment, using smart advertising machines to display the latest travel information is another effective way.

　　You can easily check the real-time dynamics of flights, accurate information about nearby bus and train stations, or other key travel-related information. This allows guests to plan their trips in advance, check the time before leaving the hotel, and easily get the location of nearby bus stations or public transportation to reach their next destination.

　　Digital Concierge

　　As the digitalization of the hotel industry accelerates, hiring a virtual concierge is an ingenious way to connect guests with the local community. Hotel virtual concierges present the latest information in real time through digital signage solutions on smart advertising machines.

　　You can use a custom-designed virtual concierge image library in the hotel lobby to turn smart advertising machines into virtual concierge kiosks to greatly enhance the guest experience.

　　In addition, you can also use smart advertising machines to display photo slideshows, present the hotel’s dining features and complete facilities in all aspects, and provide guests with detailed information at their fingertips, thereby comprehensively improving the overall guest experience.

　　In short, the uses of hotel smart advertising machines are rich, attractive, efficient, practical and convincing. By cleverly using these smart advertising machines and pursuing a high return on investment, you can maximize their value, add points to the hotel’s service quality, and attract more guests.

　　Electric vehicles can be sent by express delivery, and common express delivery companies such as SF Express, Yunda Express, Yuantong Express, Shentong Express and Zhongtong Express can undertake the mail service of electric vehicles.period free shipping electric bike Many adjustments have also been made, and the direction of product research and development has been reversed, in order to better meet the market demand. https://www.chamrider.com/

　　It should be noted that the battery is not allowed to be mailed, so the battery must be removed before sending the electric car.

　　When mailing electric cars, the charging standards of different courier companies may be different, depending on the mailing distance and specific regulations. It is recommended to consult several courier companies before sending, understand the specific charges and choose the most suitable courier service.

　　In order to reduce the mailing cost, you can put the electric car in a wooden box for packaging. If you can’t find a suitable box, the courier company can also provide packaging service, but the packaging fee needs to be paid extra.

　　After the electric vehicle is packaged, it can effectively avoid damage during transportation and ensure that the electric vehicle can reach its destination safely.

　　In the manufacturing industry, efficiency and precision are key to producing high-quality products. Customized mould inserts and components offer tailored solutions that can enhance production processes, reduce costs, and improve overall product quality. But why should you consider these over standard components? In this article, we¨ll explore the advantages of customized mould inserts and components and how they support modern manufacturing needs.At the same time, precision plastic mould components It is no longer a relatively unfamiliar industry, and it enters the public’s sight more and more frequently, gaining more attention and recognition. https://www.dghrjmmj.com

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　　Benefits of Customized Mould Inserts and Components

　　1. Enhanced Precision and Fit

　　Customized mould inserts are designed to meet specific requirements, ensuring a perfect fit for your tooling system. By working with high-precision mold components, manufacturers can achieve tighter tolerances and consistent results, which are essential for industries like automotive, aerospace, and electronics.

　　2. Improved Production Efficiency

　　When your mould inserts and components are customized to fit your processes, you can minimize downtime caused by mismatched or faulty parts. Custom precision mould parts manufacturing ensures that every component integrates seamlessly with your machinery, reducing the risk of errors and enhancing production speed.

　　3. Greater Product Quality

　　Precision-engineered mould inserts lead to higher-quality end products. The exact specifications provided by precision mold parts suppliers help maintain uniformity across all production runs, ensuring customer satisfaction and reducing the likelihood of product defects.

　　4. Cost-Effectiveness Over Time

　　Although customized mould inserts may have a higher upfront cost, they provide long-term savings by reducing material waste, improving cycle times, and extending the lifespan of your molds. With tailored components, you can also avoid frequent replacements, saving on maintenance costs.

　　5. Flexibility for Specialized Applications

　　Standard mould components may not always meet the unique demands of specialized applications. Custom precision mould parts manufacturing allows businesses to create parts that cater to specific requirements, whether it¨s for a niche product or a complex design.

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　　Applications of Customized Mould Inserts

　　Customized mould inserts are widely used across industries such as:

　　Automotive: For creating precision parts like gears and connectors.

　　Medical Devices: For high-tolerance components in sensitive applications.

　　Consumer Electronics: For intricate designs in gadgets and devices.

　　Packaging: For tailored solutions in product protection and branding.