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Nguyễn Văn Đại

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https://youtu.be/fymccGMO1Qo?si=GYF1miR_e9010Eeb

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I have recently purchased several types of bearings to replenish our stock

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https://youtu.be/jV0CNI3pKTw

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https://youtu.be/Qi1eKj5zfxs

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https://youtu.be/uZVZW7Dpw9k

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https://youtu.be/oIEX-kuK06A?si=2OuFizELPJ4UGKu8

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Plastic is a synthetic material made from polymers, known for its versatility and durability. It has properties like low density, resistance to corrosion, ease of molding, and insulation capabilities, making it ideal for numerous applications in packaging, automotive, medical, and construction industries. Plastics are lightweight, cost-effective, and can be engineered to exhibit specific characteristics, such as flexibility or rigidity, to suit particular functions. However, plastic's environmental impact is significant, as it degrades slowly and often accumulates as waste, leading to pollution and harm to ecosystems. Looking ahead, innovations in biodegradable and recyclable plastics may help mitigate environmental damage, while research on reducing plastic production and improving recycling methods could lessen dependency on this material, pushing the industry toward more sustainable solutions for everyday applications.

4o

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here are seven main types of plastic, each with unique properties and uses. PET (Code 1) is lightweight, ideal for bottles; HDPE (Code 2) is durable, used in pipes; PVC (Code 3) is chemically resistant, suitable for medical equipment; LDPE (Code 4) is flexible, used in plastic bags; PP (Code 5) is heat-resistant, common in food containers; PS (Code 6) is lightweight, often in foam packaging; and Other Plastics (Code 7), like polycarbonate, are clear and durable, found in electronics and eyewear. Each type’s characteristics support specific industrial applications.

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https://youtu.be/l81b7A5FQ_Q

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The process shown in the figure is injection molding, a common manufacturing method for shaping plastic. It involves three main steps. First, plastic pellets are loaded into a hopper, where they feed into a heated cylinder containing a rotating screw. In the second step, as the screw rotates, it moves the plastic forward, melting it with the help of heat applied externally. The melted plastic is then pushed towards the nozzle. Finally, in the third step, the ram pushes the melted plastic through the nozzle into a mold cavity, where it cools and solidifies, taking the shape of the mold. This process allows for efficient mass production of complex plastic parts with consistent shapes and sizes, commonly used in automotive, consumer goods, and medical industries.

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Common problems in plastic injection molding include warping, sink marks, burn marks, and short shots. Warping is caused by uneven cooling or mold design issues; using consistent cooling and optimizing the mold design can prevent it. Sink marks occur due to insufficient cooling time or low injection pressure; increasing both can help reduce these marks. Burn marks result from trapped air or excessive injection speed, which can be fixed by slowing the injection and improving mold venting. Short shots, where the mold is not fully filled, are caused by low injection pressure or nozzle blockages; increasing pressure and clearing obstructions are effective solutions. Careful monitoring and control of these parameters can help maintain quality and reduce defects.

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https://youtu.be/E3TqAG81H88

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https://youtu.be/ZzT8du4K5Ao

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https://youtu.be/b7arvt9obuc

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To maintain a milling machine, five types of maintenance tasks are essential: cleaning guideways, inspecting oil level, renewing oil, thorough machine cleaning, and inspecting bearing slackness. Daily tasks include cleaning the guideways to avoid interruptions and control fluid motion, and inspecting the oil level to ensure engine efficiency and prevent overheating. Semi-annually, renew the oil to ensure smooth operation. Weekly, clean the machine thoroughly to remove dust and dirt. Annually, inspect bearing slackness to prevent slippage. Each task is crucial for optimal machine performance, reducing breakdowns, and extending equipment lifespan. Following this maintenance schedule will help customers keep their milling machines running efficiently and effectively.

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https://www.youtube.com/watch?v=ZzT8du4K5Ao