What are the shortcomings of LED lighting technology?
A single LED has low power. In order to achieve high power, multiple parallel uses, such as automotive taillights, are required, and a single high power LED is expensive. Another fatal flaw in LED, low color rendering index! The color displayed under the LED illumination is not as true as the incandescent lamp, which is analyzed from the spectral distribution and is a technical problem.
Another disadvantage of LED lighting is the spot. Due to the defects in the manufacturing process of the white LED itself and the matching error with the reflecting cup or the lens, the yellow circle problem is easily caused.
The current disadvantages of semiconductor lighting are mainly in the following two aspects:
1. The price of high-power LED is relatively high. At present, the market price of high-power white LED of 1 watt is about ten to several times that of the traditional light source.
2, high-power LED application low light efficiency, commercialized 3 watts or more high-power light-emitting diodes, low luminous efficiency, lower than the luminous efficiency of more than 100 lumens per watt of high-intensity gas discharge lamps, also less than 60 lumens per watt Rare earth trichromatic fluorescent lamps. It is said that semiconductor lighting saves power and saves energy. It is actually set up in a small power range. When using current semiconductor light sources to make high-power lighting fixtures, it does not save much energy compared with existing high-efficiency light sources. On the contrary, the initial input cost is very high. high.
Another problem with low light efficiency is that a large amount of input electrical energy is converted into thermal energy. It is said that the luminous tube is a cold light source only that the illuminant itself is not a burning body, but the resistance heat generated by the large current on the semiconductor material still causes the luminous tube. Producing a higher temperature, and the light-emitting diode made of semiconductor material is not resistant to high temperature, and the overheating will greatly reduce the service life thereof. The heat dissipation by the heat sink increases the volume of the lamp, and the semiconductor light source has the advantages of small volume and light weight. disappear.
According to the above analysis, it is not easy to replace the traditional light source in the general illumination field in the short term in terms of luminous efficiency and price level. To solve these problems, the luminous efficiency of the luminous tube is greatly improved and the production cost is greatly reduced. However, under the current state of the art, the development of the semiconductor lighting industry to foster strengths and circumvent weaknesses, and actively develop in the direction of advantages, promoted its technological advancement and maturity of production processes, enabling the era of semiconductor lighting to come early.
Sheet Metal Fabrication
Definition of sheet metal fabrication
Sheet Metal fabrication is the creation of useful metallic parts and structures by the application of multiple fabrication processes. Sheet metal fabrication is basically a broad term that involves various complex processes like cutting, forming, bending, welding, machining, and assembling. The instructions include below: materials, processes, and tools required for sheet metal fabrication.
Types of Sheet Metal Fabrication Materials
The choice of metal depends on the final use of the fabricated parts.
Common fabrication processes:
· Carbon Steel
· Stainless Steel
· Aluminum
· Bronze
· Copper
· Brass
· Aluminized steel
· Galvanized steel
Types of Metal Fabrication Processes
The journey to the final product from raw sheet metals proceeds through various sheet metal fabrication processes. All the sheet metal fabrication processes can be grouped into the following three categories:
· Cutting
· Deformation
· Assembly
Sheet metal fabrication: Cutting
ii. Water jet cutting
iii. Plasma cutting
Sheet metal fabrication: Forming or Deformation
Bending: Sheet metal bending is one of the most popular deformation processes. A machine known as a Press brake is used to bend sheet metals into V, U, or other complex shapes. With an increase in gauge thicknesses of sheet metals the force required to bend increases.
Stamping: In the stamping process, a hydraulic or mechanical stamping press equipped with a tool and die is used to perform specific tasks like curling, drawing, embossing, flanging, etc
Hemming: Hemming is a process by which the edges of sheet metal are folded over itself or another piece of sheet metal to create a rounded edge. In the sheet metal fabrication process, two types of hemming processes are widely involved. They are roll hemming and conventional die hemming. Conventional hemming is used for mass production. A hemming roller is used for roll hemming.
Spinning: Spinning is a metal fabrication process where a lathe machine is used to rotate the sheet metal against a tool to produce conical or cylindrical shapes.
Sheet metal fabrication: Assembly
Assembly is basically joining Sheet Metal Components produced using above mentioned cutting or bending processes. The common sheet metal assembly process consists of joining by Welding and joining using fasteners.
Welding: In the welding process, sheet metal components are joined together by melting sections with the application of heat to form a solid connection. There are various processes available that are used to weld sheet metals.
Joining using Fasteners: Similar or dissimilar sheet metal parts can easily be joined using fasteners like bolts, screws, rivets, etc.
Brazing: Brazing is a process similar to welding that operates by melting a filler without melting the sheet metals.
Adhesives: Adhesives can be used to hold metal sheets together in conjunction with other joining methods
Advantages and Disadvantages of Sheet Metal Fabrication
As sheet metal fabrication covers a wide area of techniques and methods, the advantages and limitations will vary depending on the process used during fabrication.
Benefits:
i. Sheet metal fabrication is fast and can produce high-quality components.
i. A large number of processes are available with wide range of materials
ii. High strength to weight ratio for sheet metal fabricated parts.
Disadvantage:
i. Each fabrication process has their own limitations.
ii. High initial cost for set up of equipment and tools.
iii. Requirement of skilled labors for each process.
Sheet Metal Fabrication,Custom Sheet Metal Fabrication,Precision Sheet Metal Fabrication,Stainless Steel Sheet Metal Fabrication
Suzhou FCE precision electronics Co., LTD , https://www.fukeyifcesz.com