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Plastic injection moulding is a complex process that can be prone to several defects. Some of the most common defects include short shots, air traps, and brittleness. Short shots occur when the mould cavity cannot be completely filled, which can be caused by low die temperature, uneven plasticization of raw materials, or insufficient liquidity of raw materials. To remedy this, more fluid materials can be used, the number of gates and runner size can be increased, and injection pressure and speed can be increased. Air traps occur when air is trapped in the cavity to create bubbles in the part, which can be caused by the air being unable to escape from the parting surface, the ram, or the vent when the two melt fronts meet. To remedy this, a vent can be added at the last filled place, the injection speed of the last stage can be reduced, and the mold temperature can be increased. Brittleness occurs when the plastic part is easily cracked or broken in some place, which can be caused by dry conditions, improper injection temperature setting, inappropriate gate and runner system settings, or low melting mark strength. To remedy this, the use of excessive recycled materials can be decreased, runner and gate sizes can be increased, and the temperature of the material closer to the melt point can be reduced 1. By following these solutions, the quality of the final product can be improved, and the machine tool can operate efficiently and effectively for a long time.

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Write a paragraph (120-140 words) to describe the following plastic moulding process using the diagram below

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Write a paragraph (120-140 words) to describe the following plastic moulding process using the diagram below

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The diagram you sent appears to depict the injection moulding process. This process is used to manufacture plastic parts by injecting molten plastic into a mould cavity, allowing it to cool and solidify, and then ejecting the finished part from the mould. There are several steps involved in the injection moulding process:

1. Clamping: The two halves of the mould are securely closed together, and the plastic material is injected into the mould cavity.

2. Injection: The plastic material is melted and injected into the mould cavity under high pressure.

3. Dwelling: The plastic material is allowed to cool and solidify in the mould cavity.

4. Mould opening: The two halves of the mould are opened, and the finished part is ejected from the mould.

The injection moulding process is a complex process that requires precision and control to ensure a high-quality final product. By following the recommended maintenance schedule, the machine tool used for injection moulding can operate efficiently and effectively for a long tim

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Write a paragraph (120-140 words) to present maintenance schedule of a machine tool using the following suggested questions and information in the table.

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Write a paragraph (120-140 words) to present maintenance schedule of a machine tool using the following suggested questions and information in the table.

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To keep a machine tool in good working condition, it is important to follow a maintenance schedule. The recommended schedule for daily maintenance is to check the air pressure, warm up the spindle for five minutes, and clean the chip filter. Weekly maintenance should include checking coolant levels and topping up oil levels. Semi-annually, the spindle bearing and drive belt should be inspected. By following this maintenance schedule, the machine tool will be able to operate efficiently and effectively for a long time.

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Write a paragraph (120-140 words) about your understanding of plastic.

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Write a paragraph (120-140 words) about your understanding of plastic.

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Plastic is a synthetic material that can be molded into various shapes and forms. Plastic is made from polymers, which are long chains of repeating units called monomers. There are many types of plastic, each with different properties and uses.

One way to classify plastic is by using the resin identification code, which is a number from 1 to 7 inside a triangle of arrows. This code indicates the type of plastic and how it can be recycled. The seven types of plastic and their codes are 12:

1: Polyethylene Terephthalate (PET or PETE), used for beverage bottles, food containers, clothing, etc.

2: High-Density Polyethylene (HDPE), used for milk jugs, detergent bottles, pipes, toys, etc.

3: Polyvinyl Chloride (PVC or Vinyl), used for pipes, window frames, flooring, etc.

4: Low-Density Polyethylene (LDPE), used for plastic bags, cling wrap, squeeze bottles, etc.

5: Polypropylene (PP), used for yogurt cups, margarine tubs, straws, etc.

6: Polystyrene (PS or Styrofoam), used for disposable cups, plates, egg cartons, etc.

7: Other, used for various plastics that do not fit into the above categories, such as polycarbonate, acrylic, nylon, etc.

A common type of plastic is polyethylene, which is classified into three subtypes: high-density, low-density, and linear low-density. Polyethylene is strong, resistant to moisture and chemicals, and easy to process. Polyethylene is widely used in product packaging, construction, and agriculture

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Write a paragraph (120-140 words) about basic information of plastic (qualities and uses of plastic) using the following suggested questions.

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Write a paragraph (120-140 words) about basic information of plastic (qualities and uses of plastic) using the following suggested questions.

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lastic is made from various organic or inorganic substances, such as oil, natural gas, coal, or minerals, that are combined with chemicals to form polymers.

Some of the properties of plastic are low density, low electrical conductivity, transparency, toughness, and water resistance. These properties make plastic suitable for a wide range of applications, such as packaging, clothing, toys, furniture, electronics, medical devices, and more

In the past, people could not use plastic for many purposes because it was not invented until the late 19th and early 20th centuries. The first completely synthetic plastic was Bakelite, made in 1907 by Leo Baekeland . Before plastic, people used materials such as wood, metal, glass, or paper for various products. Nowadays, people can use plastic for almost anything, thanks to the development of new types and technologies. Plastic can be recycled, biodegradable, or compostable, depending on the composition and processing .

The future of plastic is uncertain, as it has both advantages and disadvantages. On one hand, plastic is cheap, versatile, and durable, which makes it convenient and useful for many industries and consumers. On the other hand, plastic is also a major source of environmental pollution, as it takes a long time to degrade and can harm wildlife and ecosystems. Plastic also poses health risks, as it can release toxic chemicals or microplastics into the air, water, or food . Therefore, the future of plastic depends on how people use it responsibly and sustainably, and how they find alternatives or solutions to reduce its negative impacts.

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Look at the pictures of the manufacturing process of a car wheel and the suggested questions. Make a video (1-3 minutes) to describe the manufacturing process of the wheel.

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Look at the pictures of the manufacturing process of a car wheel and the suggested questions. Make a video (1-3 minutes) to describe the manufacturing process of the wheel.

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The name of the production process is the production of a car wheel. It is made of sheet steel. There are five steeps: punch, press, weld, polish and inspection. The first step means that holes are punched in a material. Next, a sheet steel is pressed into the correct shape. Using a stamping machine to mold the product makes it easier to shape. In this step, pieces of sheet steel are joined together using very high temperature. After welding, a surface is covered with paint. The surface of the product will be painted anti-rust and more beautiful.  Finally, a product is checked carefully. After testing, we will know the good and bad rate of the product before it is put on the market. This is when we make sure that the part is made properly.

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Look at the diagram, write the manufaturing process of a check valve (120 - 140 words).

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Look at the diagram, write the manufaturing process of a check valve (120 - 140 words).

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The check valve is made of cast iron. The first step is casting. The stage means that hot liquid material is poured into a container and cooled to make the correct shape. Next, the materials are turned on a machine called a lathe. Holes are made using a drill. They will use a lathe or milling machine and have coolant. After drilling, a surface is polished. Surface paint helps the details not to rust and be more beautiful. The next step means that holes are punched in a material. Finally, a product is checked carefully. After testing, we will know the good and bad rate of the product before it is put on the market. This is when we make sure that the part is made properly.

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Write a paragraph (120 - 140 words) to describe a specific CAD program using the following suggested questions.

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Write a paragraph (120 - 140 words) to describe a specific CAD program using the following suggested questions.

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AutoCAD is a CAD (Computer-Aided Design) application software for drawing technical drawings using 2D vectors or 3D surfaces 1. This software was developed by Autodesk Corporation and had its first version at the end of 1982 1 AutoCAD was one of the first technical drawing programs to run on personal computers, especially IBM 1 computers.

AutoCAD has many features to assist users in designing, drawing and editing technical drawings, such as:

Supports many file formats, such as DWG, DXF, DWF, PDF, JPG, PNG, SVG, etc.

Allows creating and managing blocks, dynamic attributes, layers, color tables, linetypes, and text styles ), etc.

There are many commands and tools to draw, edit, transform, copy, rotate, move, expand, reduce, merge, cut, divide, join, separate, measure, annotate, dimension, draw projections, drawing sections, drawing images, drawing graphs, etc.

Supports drawing with different methods, such as drawing with mouse, keyboard, commands, stylus, etc.

Supports 3D drawing using different technologies, such as solid modeling, surface modeling, mesh modeling, etc.

Supports displaying and printing technical drawings in many different ways, such as displaying by color, by brightness, by viewing angle, by scale, by paper size, by viewport, etc.

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Write a paragraph (120 - 140 words) to compare two types of drives using the suggested questions below.

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Write a paragraph (120 - 140 words) to compare two types of drives using the suggested questions below.

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What are the shapes of spur gears and spiral bevel gears? Straight gears have conical tooth pitch surfaces, straight and tapering towards the peak. Bevel gears have teeth curved at an angle.

Straight gears and spiral bevel gears are used to transmit power between which problems? Straight gears are mainly used to transmit power between two intersecting shafts. Helical gears are used to transmit power between two intersecting shafts or tracks.

What are the advantages and disadvantages of birch gears and helical gears? Straight gears have the advantage of being simple, easy to manufacture, cheap and have high accuracy. The disadvantages are loud noise, durability and difficulty adjusting traffic angles. Birch wheels have the advantage of being comfortable, durable, have a large load capacity and can flexibly adjust the transmission angle. Disadvantages are complexity, difficulty in manufacturing, high price and jagged artifacts.

In what areas are straight bevel gears and helical bevel gears used? Straight gears are used in simple machines that have slow rotation speeds and do not require high precision. Helical gears are used in complex machines with high rotation speeds and high precision requirements. For example, cars, airplanes, ships, machine tools, air compressors, generators, etc.

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Write a paragraph (120 - 140 words) about different types of gears using the following suggested questions.

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Write a paragraph (120 - 140 words) about different types of gears using the following suggested questions.

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A fan gear is a type of gear used to transmit power between two non-parallel shafts, usually intersecting at a certain angle. Gears have the effect of changing the direction of motion and changing the speed of the rotating shaft.

There are different types of gears, depending on the shape, size and angle of the teeth. Here are some common types of gears:

Straight bevel gear: is the simplest type of bevel gear, with triangular teeth and parallel axis of the gear. Straight gears are commonly used for 90-degree angles.

Helical gear: is a type of gear with a spiral shape, creating a helical angle such that the helical axis of the gear. Pinion gears have the advantage of running faster, vibrating less and having a greater load capacity than pinion gears.

Spiral bevel gear: is a type of gear with a spiral shape, creating a larger helix angle than spiral bevel gears. Helical gears can transmit power between shafts that are not on the same plane, such as diagonal shafts or perpendicular shafts.

Zerol bevel gear: is a type of gear that has a spiral shape but has a zero helix angle. Zerol bevel gears can transmit power between straight axes intersecting at any angle, but usually 90 degrees.

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Write a short paragraph (120-140 words) about different kinds of couplings using the following suggested questions.

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Write a short paragraph (120-140 words) about different kinds of couplings using the following suggested questions.

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To connect parts and shafts together, or to transmit power from one shaft to another, people often use couplings. There are four most common types of coupling: flexible coupling, beam coupling, sleeve-style coupling and rigid coupling. With beam coupling is more flexible than the multi-beam but less torsional rigid. Applications include: Stepper drives, encoders, general purpose light, with sleeve-style coupling is a basic type of couplings including a pipe whose bore is finished to the required tolerance based on the shaft size.

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Nặng quá em ko up video trực tiếp được cô ạ (huhu)

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Nặng quá em ko up video trực tiếp được cô ạ (huhu)

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https://drive.google.com/file/d/115scTMoIj7tz1R6eroN26hdKMzJ8wRR0/view?usp=sharing

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Task 6: Write a paragraph about what a person should do in a presentation

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Task 6: Write a paragraph about what a person should do in a presentation

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To write a good and attractive presentation. We need to divide it into the following steps. Step one, determine the structure of a presentation. A presentation consists of 3 parts, beginning, body, and conclusion. Step 2, prepare carefully before the presentation, gain confidence, research thoroughly about the topic you are presenting, read the presentation a few times in advance. You should not make a presentation that is too long, you should focus on the presentation topic and combine it with a slide show to make it easier for the audience to understand and create interest. At the end of the presentation, there should be a question and answer session for the audience to ask questions during the presentation.

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Write a paragraph (120-140 words) to present maintenance schedule of machine tools using the following suggested questions.

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Write a paragraph (120-140 words) to present maintenance schedule of machine tools using the following suggested questions.

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Machine tools are used in a variety of industries to shape and cut materials into specific shapes and sizes. To keep these machines operating at peak performance, it is important to follow a regular maintenance schedule. The recommended schedule for daily maintenance includes checking the air pressure, warming up the spindle for five minutes, and cleaning the chip filter. Weekly maintenance should include checking coolant levels and topping up oil levels. Semi-annually, the spindle bearing and drive belt should be inspected. By following this maintenance schedule, the machine tool will be able to operate efficiently and effectively for a long time. Neglecting maintenance can lead to decreased performance, increased downtime, and costly repairs. Therefore, it is important to prioritize maintenance to ensure the longevity of the machine tool.

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https://drive.google.com/file/d/1BE4TZ-KLRL3nazAOMAHhRSQ4mCRA_aUs/view?usp=sharing