tiếng anh cơ khí 1 by Lâm Lương https://padlet.com/lamluong076/62vhjcwa2hm9l0xn en-us 2022-09-17 14:35:34 UTC 2024-04-01 07:04:25 UTC hello@padlet.com lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2301027822 2022-09-17 15:03:07 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2301027822 lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2306881453 2022-09-21 13:45:59 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2306881453 lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2312281218 2022-09-25 14:30:36 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2312281218 Gear is a rotating circular compone machine with teeth , which mesh with another toothed part to some of The main functions of gears are to the power and motion between machine components transmit torque and change the speed, torque and direction of a power source. There are five types of gears: Spur gears, helical gears, I worm and worm gear rack and pinion, and I bevel gears. Spur gears have teeth projecting towards or ang away from the center using in low -speed applications but they can not control noise at high speed. Helical gears have their teeth cut in a spiral shape, they are used in high speed applications, large power transmission Next is worm and worm gear, A worm has just one continuous tooth and it pairs with a worm gear, they are used for reducing speed. About rack and pinion, they consist of a circular gear on the pinion engaging a linear gear or the rack Lusina to convert rotational motion into linear motion. Finally is bevel gear, they have a conical form and can be used to transmit rotational power through shafts at an angle, normally 90 degrees. lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2322481545 2022-10-02 09:22:13 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2322481545 As I know there are two types of pro Belt drive and chain drive. Belt drive tool is used to transmit motion and power from One shaft to another by means of friction between belts and pulleys while chain drive is for transmitting motion and power between successive chains with sprocket special toothed Wheels. They have some differences. Belt drive is made by rubber, plastic Chain drive and different from Belt drive because it is made of metal. Belt drive reduces noise and vibration during operation, Unlike belt drive, chain drive causes these problems. Slippage occurs in belt drive but it doesn't occur in chain drive. While belt drive has low efficiency due to frictional loss, chain drive has high efficiency (above 95%). The belt tension of the chain drive is affected by atmospheric condition and temperature. Unlike chain drive, belt chain drive is not. Belt drive requires minimum maintenance except for belt re-tension while chain drive requires regular lubrication. About some application of each type, chain drive is applied in Bicycle, motorcycle, agricultural and textile machinery and material handling equipment while belt drive is used in flour mills, coolant pump, lubricant pump, AC, cam shaft alternator, lath machines and a lot of other machines. lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2322481684 2022-10-02 09:22:42 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2322481684 Computer - aided design (CAD) is the creation and handling of pictures on a computer to assist engineers in design and drafting. Manual Drafting is the practice of creating drawings by hand with pencil or ink on a media such as paper or polyester film using drafting equipment. While CAD has a quick layout of a preliminary design and necessary change, manual drafting has the capability to create single detailed drafting (by hand with pencil or ink). CAD needs operation skills (in minimum) and Analytical skills. Unlike CAD, manual drafting requires designing skills and explanation skills. CAD has high accuracy (in representation) and has error (in explanation). Manual drafting is different from CAD, it is easy misreading because of ambiguity and drawing errors . CAD is easy to use and flexible so designers make changes or modifications easily. Unlike CAD manual drafting takes time consuming because drafter has to start from the beginning to make changes. lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2337313535 2022-10-12 16:17:53 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2337313535 Describe a specific a CAD program I want to introduce a CAD program I know. It is Solid Works. Solidworks was first released in 1997 and now it has become one of the most used programs in professional settings across the globe. It has lots of functions but designers often use it to sketch out ideas, experiment with features and dimensions. SolidWorks also has the capability to produce models and detailed drawings. Some pros of this CAD program are that it is easy and intuitive to use from the beginning, easy to use for 3D modeling. It's also quick and easy to create parts, add them to assemblies and create drawings. Besides pros, SolidWords has some cons. This program is expensive. It also contains some unnecessary features for the common user. lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2337314026 2022-10-12 16:18:12 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2337314026 lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2337323292 2022-10-12 16:24:14 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2337323292 lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2337327725 2022-10-12 16:26:57 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2337327725 As far as I know, plastic is a synthetic material. It is versatile, safe, lightweight, durable, chemically unreactive and cost-efficient. So, what can people do with plastic? In the past, about 100 years ago, manufacturers could produce modern synthetic plastics. We couldn't mold plastic into complex shapes. Nowadays, manufacturers can mold plastic into a variety of complex shapes. At present, it is possible to replace components in engines with plastics and plastics can be used in manufacturing to help designers reduce weight in aircraft. In the future it will save money and increase efficiency by using smart plastic coatings on manufacturing components. Soon, it will be possible to use eco-friendly bioplastics in a wide range of applications in electronics telecommunications, aerospace, and automotive. In the near future, we will be able to make plastics from any kind of plant materials. Using plastic brings us a great number of benefits. It is convenient (shopping plastic bags), lightweight (plastic bottles) and cheap posting - (packaging and wrappings). It is also durable and resistant to all kinds of adverse outside factors (heavy rain, storms). However, using too much plastic every day people may face with different problems. First, plastic can hurt the environment. Second, it can not be biodegradable. Finally, plastic cannot be recycled. lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2362062367 2022-10-30 13:54:16 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2362062367 As far as I know, there are 7 types of plastic. Number 1 is PET - polyethylene terephthalate. Number 2 is HDPE high - Density Polyethylene . Number 3 is Polyvinyl chloride - PVC. Number 4 is Low Density Polyethylene - LDPE. Number 5 is PP - Polypropylene. Number 6 is Polystyrene (PS) and Number 7 is others plastics. In the 77 types of plastics, Number 1 - PET is the most common type of plastic. It hold the number 1 spot because of its widespread utility. It is mostly used for food and drink packaging purposes due to its properties: Oxygen prevention and widely recycled. lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2362062972 2022-10-30 13:54:36 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2362062972 lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2362092626 2022-10-30 14:40:08 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2362092626 lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2362092945 2022-10-30 14:40:39 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2362092945 lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2362093258 2022-10-30 14:41:11 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2362093258 lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2362093631 2022-10-30 14:41:48 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2362093631 lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2362093872 2022-10-30 14:42:11 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2362093872 lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2362094119 2022-10-30 14:42:36 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2362094119 lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2362094389 2022-10-30 14:43:02 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2362094389 lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2362100236 2022-10-30 14:51:32 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2362100236 lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2362100649 2022-10-30 14:52:08 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2362100649 The check valve is made of cast iron. There are 6 steps you need to follow when manufacturing a checked value. The first step is casting . In this step hot liquid of cast iron is poured into a container and then cooled to make the correct shape. The cast iron is then turned on a lathe to remove excessive parts. Next step is drilling, holes are made using a drill. After the drilling process, the next step is painting, the surface is covered with paint. Next step is punching, in this step holes are punched in a material. The final step is inspection, in this step, the product is checked carefully. lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2362104640 2022-10-30 14:58:00 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2362104640 As I can be seen in figure 1, this is the process of extrusion molding. There are 6 steps in this process. In Step 1 , we move the polymer pellets from the hopper to the cylinder. Next, An electric motor turns to the screw in the extrusion molder. After that, the cord polymer pellets move along the cylinder. In the next step, Heaters warm the polymer pellets to turn them into a liquid. Next, the warm, soft molten polymer moves along the cylinder. Finally, the machine pushes the molten polymer out into the mould. lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2381599909 2022-11-13 15:04:09 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2381599909 lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2381600265 In plastic injection moulding there are 2 typical problems : void and sink mark. Void is a phenomenon when a pocket of air is trapped within or close to the surface or an infection moulded prototype. Void is caused by plastic shrinkage (a hole suddenly develops in a thick section during cooling). In addition, plastic volume changes when plastic is heated or cooled. To solve this problem, you need to increase the injection pressure to force more material into the mould and reduce shrinkage, reduce wall thickness, slow down cooling rate and increase gate size and locate it at the thick part of the moulding. Next problem is the sink mark. It is a phenomenon in which the surface of the finished part has holes in the thicker area of the injection molded. The main causes of sink mark are the internal stress is too high and the part has too low a surface rigidity. To solve this problem, we need to have enough shot size, increase holding pressure and holding time, Moreover, we also need to reduce mould temperature and all reduce wall thickness for faster cooling.]]> 2022-11-13 15:04:40 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2381600265 My job is a lathe maintenance worker. my job is to check the line pressure gauge, check the air pressure and increase the spindle speed. In addition I clean the chip filter I do the above work every day. As for things like checking all the filters, checking the coolant level, checking the oil and changing the oil, I do it weekly. As for the main bearing inspection, belt drive inspection, oil change and oil check, I do it every half a year. That's my whole job. lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2381600406 2022-11-13 15:04:56 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2381600406 This is a high performance cutter. it can cut with very high productivity and the product output is 3 times that of ordinary cutter. This machine is specialized for cutting solid cylindrical iron ingots. because of operating in conditions with a lot of chips, iron dust, high engine and blade temperature. In order for the machine to function properly and avoid breakdowns, regular maintenance is required. First of all, it is necessary to sweep the chips daily after work to prevent dirty chips from sticking to the engine causing the engine to overheat leading to a short circuit. Check weekly and add enough coolant to prevent damage to the workpiece and cutting edge. working . monthly, check the machine shaft for cracks or open circuit to avoid accidents while working. lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2381600558 2022-11-13 15:05:13 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2381600558 lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2386799777 2022-11-16 15:32:05 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2386799777 lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2386823552 2022-11-16 15:45:13 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2386823552 lamluong076 https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2386831689 2022-11-16 15:49:37 UTC https://padlet.com/lamluong076/62vhjcwa2hm9l0xn/wish/2386831689