Technical analysis of dry ice cleaning of electrical components to remove burrs
Abstract: Dry ice cleaning is a cleaning method that uses dry ice particles to accelerate and impact the surface of the object to be cleaned in high-pressure airflow, and uses the low temperature and sublimation effect of dry ice to make the dirt or burrs on the surface of the object fall off or break. This article introduces the principles, characteristics, advantages and applications of dry ice cleaning, focusing on analyzing the technical points and effects of dry ice cleaning in removing burrs from electrical devices, providing a new solution for improving the quality and performance of electrical devices.
Keywords: dry ice cleaning; electrical components; deburring
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  1. Principles and characteristics of dry ice cleaning
    Dry ice is solid carbon dioxide with a temperature of -78.5°C. It does not liquefy under normal pressure, but directly changes from solid to gaseous state. This phenomenon is called sublimation. Dry ice cleaning is a cleaning method that uses dry ice particles to accelerate and impact the surface of the object to be cleaned in high-pressure airflow, and uses the low temperature and sublimation effect of dry ice to make the dirt or burrs on the surface of the object fall off or break.
    Dry ice cleaning has the following characteristics:
    (1) No secondary pollution. Since the dry ice particles will sublimate into gas immediately after hitting the surface of the object, leaving no residue, they will not cause secondary pollution to the environment, nor will they cause damage or corrosion to the object being cleaned.
    (2) No wear and tear. Because dry ice particles have a certain degree of flexibility and elasticity and can adapt to the surfaces of objects of different shapes and sizes, they will not cause wear or scratches to the objects being cleaned.
    (3) Low temperature effect. Due to the extremely low temperature of dry ice particles, the dirt or burrs on the surface of the object to be cleaned can quickly reduce the temperature and shrink, thereby reducing its adhesion to the surface of the object. It can also make the dirt or burrs brittle and easy to break or break. fall off.
    (4) Sublimation effect. Because dry ice particles will sublimate into gas immediately after hitting the surface of the object, and their volume will expand nearly 800 times, a strong explosive force will be generated on the surface of the object, further peeling off or breaking dirt or burrs.
  2. Technical key points and effects of dry ice cleaning in removing burrs from electrical devices
    Electrical devices refer to components used in circuits for connection, control, conversion, storage, detection, etc., such as resistors. Electrical devices refer to components used in circuits for connection, control, conversion, storage, detection, etc. , such as resistors, capacitors, inductors, switches, relays, diodes, transistors, integrated circuits, etc. There are many types and functions of electrical devices, which can be classified according to different standards, such as structural characteristics, working principles, uses, etc.1. This article mainly introduces some commonly used electrical devices, such as relay 2, and analyzes their application in dry ice cleaning to remove burrs.
    A relay is an electrical control device. It is an electrical appliance that causes a predetermined step change in the controlled quantity in the electrical output circuit when the change in the input quantity (excitation quantity) reaches the specified requirements. It has the interactive relationship between the control system (also called the input loop) and the controlled system (also called the output loop). The main parts of the relay are the electromagnetic system, contact system, and arc extinguishing device. The working principle of the relay is: when AC current passes through the electromagnetic coil of the AC contactor, the electromagnetic coil generates a magnetic field, which magnetizes the moving and stationary iron cores, causing sufficient attraction between the two. The moving iron core overcomes the reaction spring force and moves towards the stationary iron core. Movement to close the normally open main contact and the normally open auxiliary contact, and to open the normally closed auxiliary contact. The main contact then connects the main circuit. Relays can realize remote control, frequently connect and disconnect load circuits, control high-power equipment and other functions.
    Dry ice cleaning to remove burrs is a cleaning method that uses dry ice particles to accelerate and impact the surface of the object to be cleaned in high-pressure airflow, and uses the low temperature and sublimation effect of dry ice to make the dirt or burrs on the surface of the object fall off or break. Dry ice cleaning has the characteristics of no secondary pollution, no wear, low temperature effect and sublimation effect. Dry ice cleaning has the following technical points and effects in removing burrs from electrical devices:
    (1) Dry ice cleaning can effectively remove burrs3 from plastic parts and improve the appearance quality and performance of the product. Dry ice particles accelerate and impact the burrs of plastic parts in high-pressure airflow, causing them to become brittle and fall off. Dry ice vaporizes instantly during this process without producing any secondary waste, leaving only the dirt that needs to be cleaned.
    (2) Dry ice cleaning can effectively remove fine metal burrs1 on metal parts and improve the accuracy and durability of the parts. Dry ice particles accelerate and impact the burrs on metal parts in high-pressure airflow, causing them to break or peel off due to the influence of low temperature and sublimation effect. Dry ice in (3) Dry ice cleaning can effectively remove dust, oil, solder, etc. from circuit boards, improving the reliability and performance of circuit boards. Dry ice particles accelerate and impact the dirt on the circuit board in the high-pressure airflow, causing it to decompose or peel off due to the influence of low temperature and sublimation effect. Dry ice vaporizes instantly during this process and will not cause moisture or residue on the circuit board, nor will it cause any damage to the components on the circuit board.
    Technical analysis of dry ice cleaning burr removal can be carried out from the following aspects:
    1The mechanism and principle of dry ice cleaning.
    I will analyze the following aspects for you:
    (1) The impact of dry ice particles and high-pressure airflow on the surface of objects. Dry ice particles are accelerated in the high-pressure air flow, ejected through the nozzle, and impact the surface to be cleaned. In this way, the momentum change of the dry ice particles will generate a peeling force, causing the dirt or burrs on the surface of the object to fall off or break due to mechanical impact. The faster the dry ice particles, the greater the impact and the better the cleaning effect. However, if the speed is too fast, it may also cause damage or wear to the surface of the object. Therefore, it is necessary to select appropriate pressure and flow rate according to different object materials and dirt levels.
    (2) Low temperature effect of dry ice particles. The temperature of dry ice pellets is extremely low, as low as minus 78 degrees Celsius. When dry ice particles come into contact with the surface of an object, they will quickly absorb heat, causing the temperature of the surface of the object to decrease. In this way, dirt or burrs on the surface of the object will undergo thermal shrinkage and embrittlement, thereby reducing its adhesion to the surface of the object and making it easy to be peeled off or broken. At the same time, dry ice particles will also have a certain disinfection and sterilization effect on the surface of objects.
    (3) Sublimation effect of dry ice particles. Dry ice particles will immediately change from solid to gaseous state upon contact with the surface, that is, sublime. In this way, the dry ice particles will expand nearly 800 times in an instant, generating an explosive force, which further increases the peeling force, making it easier to remove dirt or burrs on the surface of the object. At the same time, since the dry ice particles are completely sublimated into carbon dioxide gas, no residue or secondary pollution will be left behind.
    (4) Size, shape, density, temperature and other parameters of dry ice particles. These parameters will affect the effectiveness and efficiency of dry ice cleaning. Generally speaking, the smaller the size of the dry ice particles, the more regular the shape, the higher the density, and the lower the temperature, the better the cleaning effect. However, these parameters must also be adjusted and optimized according to different cleaning objects and requirements. For example, for surfaces with complex structures or fine pores, smaller-sized dry ice particles need to be used; for surfaces with thicker or harder dirt, larger-sized dry ice particles need to be used; for surfaces that are sensitive or easily damaged , you need to use dry ice particles with lower pressure and lower temperature.
    2 Advantages and applications of dry ice cleaning.
    The advantages and disadvantages of dry ice cleaning and traditional cleaning methods, as well as their applicability, efficiency, safety and environmental protection in removing burrs from electrical devices, can be compared from the following aspects:
    (1) Dry ice cleaning is a dry cleaning method that will not produce any water or solvent residues, and will not cause problems such as short circuit, leakage, corrosion, etc. Traditional cleaning methods, such as water washing, solvent washing, etc., require drying or neutralization after cleaning, otherwise they may cause damage or contamination to electrical components. Therefore, dry ice cleaning has higher applicability and safety in removing burrs from electrical devices1.
    (2) Dry ice cleaning is a non-abrasive cleaning method that will not cause mechanical damage or scratches to the surface of electrical devices, nor will it change the size and shape of electrical devices. Traditional cleaning methods, such as mechanical scraping, sand blasting, shot blasting, etc., may cause wear or scratches on the surface of electrical devices, affecting the performance and life of electrical devices. Therefore, dry ice cleaning is more efficient and protective in removing burrs from electrical devices1.
    (3) Dry ice cleaning is an environmentally friendly cleaning method that does not use any toxic or harmful chemicals and does not produce any secondary waste or pollutants. Traditional cleaning methods, such as water washing, solvent washing, etc., may use some toxic or harmful chemicals, or produce some waste water or exhaust gas that is difficult to treat or discharge. These chemicals or wastes may cause harm to human health and the environment. Therefore, dry ice cleaning is more environmentally friendly when it comes to removing burrs from electrical devices1.
    (4) Dry ice cleaning is an online cleaning method that can be cleaned directly on the production line without disassembling or moving electrical components, saving time and manpower. Traditional cleaning methods, such as water washing, solvent washing, etc., may require disassembling or moving electrical components to a special cleaning area for cleaning, and drying or neutralizing them after cleaning. These processes can add downtime and costs. Therefore, dry ice cleaning is more convenient and economical in removing burrs from electrical devices1.
    In summary, dry ice cleaning has obvious advantages over traditional cleaning methods in removing burrs from electrical devices. It can improve cleaning quality and efficiency, protect the performance and life of electrical devices, reduce personnel and environmental risks, and save time and costs. Of course, dry ice cleaning also has some limitations, such as the need for good ventilation space, a certain degree of noise, and it cannot be used to reshape metal, etc.2. Therefore, when choosing dry ice cleaning, comprehensive considerations need to be made based on specific application scenarios and requirements.
    4 Cases and evaluations of dry ice cleaning.
    (1) Burr removal from plastic parts. During the injection molding process of plastic parts, some burrs or flashes often occur, which affects the appearance and quality of the product. Dry ice cleaning can use the low-temperature peeling, impact blowing and sublimation effects of dry ice particles to quickly cool and break the dirt layer, effectively removing burrs or flash edges on plastic parts without damaging the surface of the plastic parts.
    (2) Remove fine metal burrs on metal parts. During the machining process of metal parts, some small metal burrs will also be produced, which will affect the performance and life of the parts. Dry ice cleaning can take advantage of the non-abrasive, drying and environmentally friendly properties of dry ice particles to impact the surface of parts at high speed to remove small metal burrs on metal parts without causing wear or scratches on the surface of the parts.

(3) Remove dust, oil, solder, etc. from the circuit board. During the manufacturing and use of circuit boards, some dust, oil, solder and other contaminants will accumulate, which will affect the function and stability of the circuit board. Dry ice cleaning can take advantage of the dry, residue-free and non-conductive properties of dry ice particles to easily remove various contaminants on circuit boards without causing short circuits, leakage, corrosion and other problems.
In these scenarios, the cleaning effect and economic benefits of dry ice cleaning are relatively high. Dry ice cleaning can improve cleaning quality and efficiency, protect the performance and life of electrical components, reduce personnel and environmental risks, and save time and costs. Of course, dry ice cleaning also has some limitations, such as the need for good ventilation space, a certain level of noise, and the fact that it cannot be used to reshape metal. Therefore, when choosing dry ice cleaning, comprehensive considerations need to be made based on specific application scenarios and requirements.

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