What Are Mold Core Pins Used For

  In the intricate world of injection molding, precision components play a critical role in determining the quality and functionality of the final products. One such essential component is the mold core pin. Understanding the purpose and application of mold core pins is vital for anyone involved in manufacturing, from engineers to suppliers. In this article, we will explore the uses of mold core pins, with a focus on core pin injection molding, and discuss the importance of sourcing from reliable mold core pins suppliers and factories.According to related reports, plastic mould part manufacturer To a large extent, it leads the changes of market conditions. https://www.dghrjmmj.com

  

  What Are Mold Core Pins?

  

  Mold core pins are specialized components used in the injection molding process. These pins are inserted into the mold to create precise internal features in the molded parts. They come in various sizes and shapes, depending on the design requirements of the product. Typically made from hardened steel or other durable materials, mold core pins are designed to withstand the high pressures and temperatures involved in the injection molding process.

  

  Applications of Mold Core Pins in Injection Molding

  

  1. Creating Internal Cavities and Holes

  

  One of the primary uses of mold core pins is to create internal cavities and holes within the molded parts. These pins ensure that the internal features are accurately formed, meeting the specific design and functional requirements of the product. For instance, in the manufacturing of medical devices, mold core pins are used to create precise channels and openings necessary for the device’s functionality.

  

  2. Supporting Complex Geometries

  

  Mold core pins are essential for supporting complex geometries in injection-molded parts. When a product design includes intricate details, such as undercuts or threaded sections, mold core pins help in accurately forming these features. By doing so, they enhance the structural integrity and performance of the final product.

  

  3. Enhancing Product Quality

  

  The use of high-quality mold core pins directly impacts the quality of the molded parts. Precision in creating internal features ensures that the parts fit together correctly and function as intended. This is particularly important in industries such as automotive and aerospace, where even the slightest deviation can lead to significant issues.

  

  Importance of Reliable Mold Core Pins Suppliers and Factories

  

  1. Consistency and Precision

  

  Working with a reputable mold core pins supplier ensures that the pins you receive are consistent in quality and precision. Reliable suppliers adhere to stringent manufacturing standards, ensuring that each pin meets the required specifications. This consistency is crucial for maintaining the integrity of your injection molding processes and the quality of your final products.

  

  2. Customization and Expertise

  

  A trusted mold core pins factory can provide customized solutions tailored to your specific needs. They have the expertise to design and manufacture core pins that fit your unique requirements, whether it’s for a specialized application or a high-volume production run. Their knowledge and experience can help you optimize your injection molding process, leading to better product outcomes.

  

  3. Material and Durability

  

  High-quality mold core pins are made from durable materials that can withstand the demands of the injection molding process. Suppliers who prioritize material quality ensure that their pins are resistant to wear, corrosion, and deformation. This durability translates to longer tool life and reduced downtime, ultimately saving costs and improving efficiency.

  

  Mold core pins are indispensable components in the injection molding process, playing a crucial role in creating precise internal features and supporting complex geometries. Their importance extends beyond their functional role, impacting the overall quality and performance of molded products. By partnering with reliable mold core pins suppliers and factories, manufacturers can ensure consistency, precision, and durability in their injection molding operations. Whether you are a seasoned engineer or new to the field, understanding the uses and benefits of mold core pins is essential for achieving excellence in manufacturing.

What You Didn’t Know About Truck Lights

  When it comes to enhancing vehicle safety and visibility, truck lights play a crucial role. While most truck owners are familiar with basic lighting features, there¨s much more to truck lights than meets the eye. As a professional in the field of vehicle lighting, particularly focusing on truck LED warning lights, we delve into some lesser-known facts and insights about these essential components.Truck LED warning lights are indispensable for ensuring safety on the road. These lights are designed to alert other drivers to the presence of a large vehicle, especially in challenging conditions such as fog, rain, or low light. Their high visibility helps prevent accidents and enhances the safety of both truck drivers and other road users.understand led warning lights In order to better serve customers and reflect the core competitiveness of products. https://www.lkx-mascarello.com

  

  1. Advanced Technology in LED Warning Lights

  

  Truck LED warning lights are at the forefront of lighting technology. Unlike traditional halogen lights, LED lights offer superior brightness, longer lifespan, and lower energy consumption. This makes them an ideal choice for trucks that require reliable and powerful lighting solutions. Modern LED warning lights are equipped with advanced features like strobe effects and customizable patterns, providing flexibility to meet various safety and visibility needs.

  

  2. Manufacturing Excellence: The Role of Truck LED Warning Light Factories

  

  The production of truck LED warning lights involves intricate processes to ensure high quality and durability. Truck LED warning light factories utilize cutting-edge technology and stringent quality control measures to produce lights that meet industry standards. These facilities are equipped with state-of-the-art machinery to handle the precision requirements of LED technology, ensuring that every light produced offers optimal performance and reliability.

  

  What You Didnt Know About Truck Lights

  

  What You Didnt Know About Truck Lights

  

  3. The Expertise of Truck LED Warning Light Manufacturers

  

  Truck LED warning light manufacturers play a pivotal role in the development and distribution of these crucial components. Longkexin focus on designing lights that not only enhance visibility but also withstand the harsh conditions encountered in trucking environments. Longkexin manufacturers invest in research and development to continually improve their products, integrating features such as water resistance, shock resistance, and enhanced brightness. Longkexin ensures that truck lights are both functional and durable, providing long-term value to truck operators.

  

  4. Versatility of Truck LED Strobe Lights

  

  Truck LED strobe lights are a popular choice for emergency and safety applications. These lights use rapid flashes to draw attention, making them ideal for use in situations where high visibility is critical. They are commonly used by emergency vehicles and for roadside safety to alert other drivers of potential hazards. The versatility of LED strobe lights allows for various mounting options and configurations, making them suitable for a wide range of applications beyond standard truck lighting.

  

  5. Customization and Innovation in Truck Lighting

  

  As the demand for personalized and innovative truck lighting solutions grows, Longkexin is offering more customization options. From different light patterns and colors to adjustable mounting systems, truck LED warning lights can now be tailored to meet specific needs and preferences. This customization ensures that truck operators can achieve the optimal balance of visibility and aesthetics, enhancing both safety and vehicle appearance.

High-Quality Longxiang Silicone Molding Parts Precision and Durability

  When it comes to manufacturing, precision and durability are paramount. Longxiang silicone molding parts stand out as the go-to choice for industries demanding high-quality components. Known for their exceptional performance and longevity, Longxiang¨s silicone molding parts are setting new standards in the market.In the industry, silicone overmolding parts Has been a leader in the industry, but later came from behind but never arrogant, low-key to adhere to quality. https://lxsiliconeparts.com/

  

  longxiang silicone molding parts

  

  Why Choose Longxiang Silicone Molding Parts?

  

  1.Superior Material Quality

  

  Longxiang uses top-grade silicone materials that offer excellent resilience and flexibility. These materials are resistant to extreme temperatures, chemicals, and UV radiation, making them ideal for various applications.

  

  2.Advanced Manufacturing Techniques

  

  Longxiang employs cutting-edge manufacturing processes to ensure each part meets stringent quality standards. Advanced molding techniques result in parts with precise dimensions and smooth finishes, reducing the need for additional processing.

  

  3.Custom Solutions

  

  Every industry has unique needs, and Longxiang recognizes this by offering customized silicone molding solutions. Whether you require specific shapes, sizes, or material properties, Longxiang¨s team works closely with clients to deliver tailored parts that meet exact specifications.

  

  4.Versatility in Applications

  

  Longxiang silicone molding parts are used in a wide range of industries, including automotive, electronics, medical, and consumer goods. Their versatility makes them suitable for applications such as gaskets, seals, connectors, and protective covers.

  

  5.Durability and Longevity

  

  One of the key advantages of Longxiang silicone molding parts is their durability. They maintain their integrity and performance even under harsh conditions, ensuring long-term reliability and reducing the frequency of replacements.

What Are the Characteristics of Fastener Cold Heading Process

  Cold heading is a common process for manufacturing the heads of fasteners such as bolts, screws, pins, rivets, etc. In many cases, heading is actually a type of cold heading. Cold heading is a forging method that uses a die to compress and shape metal bars at room temperature.However, with the development of the industry, non standard fasteners It will also bring us more and more consumer experiences, so that users can really feel the upgrade and change. https://jieruifasteners.com/

 

  

  The specific operation process is to put the metal bar into the cold heading machine and extrude it into shape through pressure. During the extrusion process, the metal bar will undergo plastic deformation, thereby changing its shape and size, and the head of the fastener will be formed.

  

  

  In the field of fastener manufacturing, cold heading process is widely used because of its following characteristics:

  

  1. Cold heading process can be carried out at room temperature without heating metal materials.

  

  2. Cold heading process can reduce or replace cutting processing and improve material utilization.

  

  3. Cold heading machine models and series are complete, suitable for various bolts and nuts forming, equipment performance is reliable, high efficiency, stable quality.

  

  4. Cold heading machine can realize continuous, multi-station, automatic production, simple operation, suitable for mass production.

  

  

  The cold heading process can improve the surface finish of the workpiece and ensure the accuracy of the workpiece, and can manufacture high-precision, high-strength bolts, nuts, etc.; the cold heading process can improve the mechanical properties of the workpiece, such as increasing the density and hardness of the material, thereby improving wear resistance and corrosion resistance. In general, the cold heading process can improve productivity, ensure the quality of fasteners, reduce material loss, and reduce production costs. It is increasingly widely used in the production of standard fasteners.

What are FPC Connectors and How Do They Work

  In the ever-evolving landscape of electronics, connectors play a vital role in ensuring seamless communication between various components. Among these, Flexible Printed Circuit (FPC) connectors have become increasingly popular due to their compact size, flexibility, and versatility. This article explores what FPC connectors are, their key features, how they work, and their applications across different industries.Sufficient data show that xpb terminal wire It can drive many people to find jobs, thus driving economic development. https://www.xpbdz.com/

  

  fpc connectors

  

  Understanding FPC Connectors

  

  FPC connectors are designed to connect flexible printed circuits to other electronic components, such as printed circuit boards (PCBs), displays, or other FPCs. Flexible printed circuits, or FPCs, are made of a thin, flexible substrate (usually polyimide) that supports conductive traces. This flexibility allows FPCs to be bent, folded, or twisted without damaging the conductive pathways, making them ideal for compact and dynamic applications.

  

  Key Features of FPC Connectors

  

  Compact Size: FPC connectors are designed to be small and lightweight, making them suitable for applications where space is limited.

  

  Flexibility: The connectors can accommodate the flexible nature of FPCs, allowing for movement and bending without compromising the electrical connection.

  

  High-Density Connection: FPC connectors can support a large number of connections within a small footprint, which is essential for high-density electronic applications.

  

  Reliable Contact: They provide secure and stable electrical contacts, ensuring reliable signal transmission.

  

  How FPC Connectors Work

  

  FPC connectors typically consist of a plastic housing with metal contacts arranged to interface with the conductive traces on the FPC. The working mechanism of FPC connectors can be understood through the following components and steps:

  

  1. Contact Points:

  

  The metal contacts within the FPC connector are designed to align with the conductive traces on the FPC. These contacts are usually made of copper alloy and are plated with gold or tin to enhance conductivity and prevent corrosion.

  

  2. Connection Types:

  

  FPC connectors come in various types, including Zero Insertion Force (ZIF), Low Insertion Force (LIF), and non-ZIF connectors. Each type has a different method for securing the FPC:

  

  ZIF Connectors: These connectors have a locking mechanism that allows the FPC to be inserted without applying significant force. Once the FPC is in place, the locking mechanism is engaged to secure the connection. This design minimizes the risk of damaging the FPC during insertion.

  

  LIF Connectors: Similar to ZIF connectors, LIF connectors require low insertion force but do not have a locking mechanism. They rely on the friction between the contacts and the FPC to maintain the connection.

  

  Non-ZIF Connectors: These connectors require the FPC to be inserted with a certain amount of force to establish the connection. They are simpler in design but may not be as user-friendly as ZIF or LIF connectors.

  

  3. Insertion and Locking:

  

  To connect an FPC to an FPC connector, the following steps are typically followed:

  

  Preparation: Ensure the FPC is properly aligned with the connector, matching the conductive traces with the metal contacts.

  

  Insertion: Insert the FPC into the connector¨s slot. For ZIF connectors, this step requires minimal force.

  

  Locking: Engage the locking mechanism (if present) to secure the FPC in place. This ensures a stable and reliable electrical connection.

  

  4. Signal Transmission:

  

  Once the FPC is securely connected, electrical signals can be transmitted between the FPC and the connected component (e.g., a PCB or display). The metal contacts in the connector facilitate this transmission, ensuring minimal signal loss and high reliability.

Top Benefits of Using a Silicone Bottle Cleaning Brush for Your Kitchen

  Maintaining a clean and hygienic kitchen is essential for both health and convenience, and having the right tools can make a significant difference. One such tool that has gained popularity is the silicone bottle cleaning brush. Here¨s why this versatile tool is a must-have for any kitchen.We have every reason to believe. silicone baby teether It will become the mainstream of the industry and will gradually affect more and more people. https://lxsiliconeparts.com/

  

  1. Durable and Long-Lasting

  

  Silicone bottle cleaning brushes are known for their durability. Unlike traditional brushes with bristles that can wear out or fall off, silicone brushes are designed to withstand frequent use and high temperatures. Their resistance to wear and tear ensures that they remain effective for a long time, making them a worthwhile investment for your kitchen.

  

  silicone bottle cleaning brush

  

  2. Hygienic and Easy to Clean

  

  One of the standout features of silicone bottle cleaning brushes is their hygienic properties. Silicone is non-porous, which means it does not harbor bacteria, mold, or odors. This makes the brush easier to clean compared to traditional brushes. Simply rinse it under running water or place it in the dishwasher for a thorough clean, and it¨s ready for the next use.

  

  3. Flexible and Effective Cleaning

  

  The flexibility of silicone allows the brush to reach into tight spots and clean irregularly shaped bottles and containers. The soft yet firm silicone bristles effectively scrub away residue without scratching or damaging surfaces. This makes silicone brushes particularly useful for cleaning bottles, jars, and even delicate glassware.

  

  4. Safe for All Types of Bottles

  

  Silicone bottle cleaning brushes are safe to use on a variety of bottle materials, including glass, plastic, and stainless steel. The gentle bristles ensure that bottles are cleaned thoroughly without any risk of scratching or chipping. This versatility means you can use the same brush for all your cleaning needs.

  

  silicone bottle cleaning brush

  

  5. Eco-Friendly Option

  

  Choosing a silicone bottle cleaning brush is an eco-friendly decision. Silicone is a sustainable material that doesn¨t contribute to the waste and environmental problems associated with plastic bristle brushes. Additionally, the durability of silicone brushes means they have a longer lifespan, reducing the need for frequent replacements.

  

  6. Comfortable and Ergonomic Design

  

  Many silicone bottle cleaning brushes are designed with ergonomics in mind. They often come with comfortable handles that provide a secure grip, making cleaning tasks less strenuous. The design ensures that you can clean efficiently without straining your hands or wrists.

  

  Conclusion

  

  Silicone bottle cleaning brushes offer a range of benefits that make them an excellent addition to any kitchen. Their durability, hygiene, flexibility, and eco-friendly nature make them superior to traditional cleaning brushes. If you¨re looking for a tool that will simplify your cleaning routine while being kind to the environment, a silicone bottle cleaning brush is the ideal choice. Embrace the convenience and effectiveness of silicone brushes and enjoy a cleaner, healthier kitchen.

With the rapid development of science and technology,

  With the rapid development of science and technology, our lives have entered a new era of intelligence. In this era, cars are not only a means of transportation, but also an indispensable part of our lives. With the continuous advancement of automotive technology, our driving style is also undergoing profound changes.If we can practice these points, car camera manufacturer Will be unique, become a leader in the industry, and keep moving forward. https://szdfpls.com

  

  Among them, ADAS (Advanced Driver Assistance Systems), as an important part of automotive intelligence, is gradually changing our driving style. It not only improves driving safety, but also provides drivers with a more convenient, safe and comfortable driving experience.

  

  01. What is ADAS?

  

  Advanced driver assistance systems (ADAS) are systems that integrate multiple sensors, cameras, radars and other equipment to achieve real-time perception and decision-making of the vehicle¨s surroundings. It can provide a variety of auxiliary functions during vehicle driving, such as adaptive cruise control and automatic parking, so that drivers can control the vehicle more easily and reduce driving fatigue and stress. At the same time, it can also sense changes in the surrounding environment in real time and remind drivers of potential dangers, thereby avoiding traffic accidents and improving driving safety.

  

  02. How are ADAS classified?

  

  The related functions covered by the ADAS system include lane departure warning, adaptive cruise control, etc., which are complicated and dazzling. Proper classification can help us better understand and apply them.

  

  The ^Terms and Definitions of Road Vehicle Advanced Driver Assistance Systems (ADAS) ̄ released in 2020 divides the functions covered by ADAS into information assistance and control assistance.

Single-core Cable and Multi-core Cable

  Is it better to have a multi-core cable or a single-core cable? The difference between single-core cables and multi-core cables. Power cables are generally divided into single-core, double-core and three-core cables. Among them, single-core cables refer to cables with only one conductor in one insulation layer, while double-core cables refer to cables with two conductors in one insulation layer. In fact, both have their advantages and disadvantages. For example, when the line of a single-core cable is long, when the control circuit with a large current is used or when it is laid in water, in order to prevent or reduce the middle connector, or when single-core cables have better comprehensive safety engineering than multi-core cables, single-core cables can be used.With the upsurge of industry development, shielded twisted pair cable The expressive force in the market has also been very good, bringing many brand-new high-quality experiences to users. https://www.linkcablecn.com

  

  Is it better to have a multi-core cable or a single-core cable?

  

  1. From the current point of view, the current passing through a multi-core cable with the same cross-sectional area is relatively larger than that of a single-core cable, and the load is large.

  

  2. From the perspective of power loss, the two ends of the single-core cableare directly grounded, and the metal shielding layer of the cable may also generate circulating current that can reach the current carrying capacity of the cable, which wastes power and forms loss. Multi-core cables are generally three-core cables, because during the operation of the cable, the sum of the currents flowing through the three cores is zero, and there is basically no induced voltage at both ends of the cable metal shielding layer.

  

  3. From the perspective of cost, among the wires of the same cross-sectional area, the cost of single-core cables is cheaper than that of multi-core cables, and multi-core cables are slightly more expensive.

  

  4. From the perspective of installation, single-core cables appear harder when passing through pipes, while multi-core cables are softer and easier to wire.

  

  Multicore Flexible Cables.jpg

  

  Multicore Flexible Cable.jpg

  

  The difference between single-core cables and multi-core cables

  

  2-core cables: When the neutral line of 1kv and below power supplies is directly grounded, the number of cable cores of the single-phase control circuit should be 2-core cables when the maintenance line and the neutral point share the same conductor. For control circuits that can be powered by DC, 2-core cables should be used.

  

  3-core cable: When the neutral line of 1kv and below power supply is directly grounded, the number of cable cores of the single-phase power control circuit is: When the protection line and neutral point are separate, it is advisable to use a 3-core cable.

  

  4-core cable: 1kv and below 4-core cable (3+1 cable), in which the fourth core is used as a grounding protection, and also carries the unbalanced current and short-circuit capacity of the power supply system. (To learn more about cable technology, please click here, a lot of dry goods are waiting for you) Its size is determined by the unbalanced current and short-circuit capacity, but generally cannot be less than 1/2 of the phase line.

  

  5-core cable: 1kv and below three-phase four-wire distribution room system, some electrical equipment distribution lines with higher safety requirements, and some communication centers and automation equipment that must ensure power safety and anti-interference grounding, it is advisable to use 5 copper core cable TN-C distribution room system, so that the protection line (PE line) and neutral point (PN line) are independent, and the cable core section is generally 3 large and 2 small or 4 large and 1 small or 5 large.

  

  Multicore Flexible Cable supplier.jpg

  

  The difference between 4-core cable and 3+1 core cable: 1kv and below three-phase four-wire distribution room system, when the protection line and neutral point share the same conductor, 4-core cable should be used, and the method of 3-core cable plus single-core cable to form a circuit cannot be used, or even the method of directly using the metal sheath or armored cable layer of 3-core cable as the neutral point. Otherwise, when the 3-phase current is unbalanced, it is equivalent to the operation of a single-core cable, which is easy to cause DC interference.

How big is the difference between a gaming mouse and a regular mouse

  There are significant differences in design and performance between gaming mice and regular mice. Gaming mice are designed specifically for gamers with greater accuracy, sensitivity, and responsiveness. Typically has a higher sampling rate, which is the number of data packets the mouse sends to the computer per second. This ensures smoother mouse movement, reduces latency, and provides faster response times. Also often equipped with additional customizable buttons and programmable functions. Players can map commonly used operations to the mouse according to game needs, thereby improving operation efficiency.Sufficient data show that aula mechanical keyboard It can drive many people to find jobs, thus driving economic development. https://www.aulastar.com/

  

  The design difference between gaming mouse and ordinary mouse:

  

  The design of gaming mouse is also different from that of ordinary mouse. Gaming mouse is usually more ergonomic to make players more comfortable when using it for a long time. After professional design, gaming mouse can provide better hand feel and reduce hand fatigue.

  

  In addition, gaming mice often adopt more anti-slip and anti-sweat designs to ensure that players will not be affected by sweaty hands during intense games. They are usually equipped with lighting effects to enhance the player’s gaming experience. These lights can be customized according to the player’s preferences to make the gaming process more interesting.

  

  Appearance: Gaming mice have various appearances, with different sizes, lines, buttons, etc.; ordinary mice have a simpler appearance, mostly in a business style, with a small appearance and no extra decorations or function buttons;

  

  For consumers, which one is better, a gaming mouse or an office mouse, depends on the usage scenario. If you just browse the web and do simple office operations, then a general office mouse is enough, and office mice are becoming more and more diverse. But if you use it for gaming, want a better gaming experience, require precise operations, and like more customized options, then a gaming mouse is undoubtedly more suitable.

What Are the Differences between Cold Heading and Cold Extrusion

  Cold heading and cold extrusion are basically deformation processes under the same conditions, but they are different in operation. Cold heading is a forging deformation of smaller workpieces and is often used in the fastener industry. Cold extrusion is an extrusion deformation of larger workpieces and has a wide range of uses.Now, everyone is right non standard fasteners Are more concerned, hoping to get more benefits from it. https://jieruifasteners.com/

  

  1. What is cold extrusion

  

  Cold extrusion is a processing method in which a metal blank is placed in a cold extrusion die cavity and, at room temperature, a punch fixed on the press is used to apply pressure to the blank to cause the metal blank to undergo plastic deformation to produce parts. Obviously, cold extrusion processing relies on the die to control the flow of metal and relies on the large-scale transfer of metal volume to form parts. In terms of extrusion equipment, my country has the ability to design and manufacture extrusion presses of various tonnages. In addition to using general mechanical presses, hydraulic presses, and cold extrusion presses, friction presses and high-speed and high-energy equipment have also been successfully used for cold extrusion production.

  

  At present, cold extrusion technology has been widely used in industrial sectors such as fasteners, machinery, instruments, electrical appliances, light industry, aerospace, shipbuilding, and military industry, and has become one of the indispensable and important processing methods in metal plastic volume forming technology. With the advancement of science and technology and the continuous improvement of product technical requirements in the automobile, motorcycle, household appliances and other industries, cold extrusion production technology has gradually become the development direction of refined production of small and medium-sized forgings.

  

  

  2. What is cold heading

  

  Cold heading is one of the new processes of metal pressure processing with little or no cutting. It is a processing method that uses the plastic deformation of metal under the action of external force, and with the help of a mold, the metal volume is redistributed and transferred to form the required parts or blanks. The cold heading process is most suitable for the production of non standard fasteners such as bolts, screws, nuts, rivets, and pins. The commonly used equipment for cold heading is a dedicated cold heading machine. If the production volume is not too large, it can also be replaced by a crank press or a friction press.

  

  Cold heading technology has high productivity, good product quality, and greatly reduces material consumption, reduces production costs, and improves working conditions. Therefore, it is more and more widely used in mechanical manufacturing, especially in the production of standard fasteners. Among them, the most representative products produced by multi-station cold heading machines are bolts, screws and nuts.

  

  3. Are cold heading and cold extrusion the same thing?

  

  Cold heading and cold extrusion are basically deformation processes under the same conditions, but they are different in operation. Cold heading is a forging deformation of smaller workpieces and is often used in the fastener industry. Cold extrusion, on the other hand, is an extrusion deformation of larger workpieces and is widely used; cold heading is equivalent to a branch of cold extrusion. Simply put, in the process of making bolts, hexagonal head forming is cold heading, and rod diameter reduction is cold extrusion (positive extrusion). Non-cut hexagonal flange bolts (multi-station forming) have both cold heading and cold extrusion. The front shaping of hexagonal nuts is only cold heading, and the hole extrusion in the back process is cold extrusion (positive and negative extrusion).