Institute of Electronics Institute of China website June 12 disclosure, the Institute successfully developed China's first microwave photon radar prototype, and through the field of non-cooperative imaging test target, access to the first domestic microwave photon radar imaging pattern, the image resolution On an order of magnitude higher than international standards.
China's first microwave photon radar was born
Radar has the ability to detect and image the target all-weather all-weather and has a wide range of applications in military and civilian applications. The traditional radar realizes the signal generation and processing with the electron as the carrier, and the resolution and processing speed have bottlenecks due to the limitation of the bandwidth of the electronic device, so that it is difficult to meet the demand for high performance radar in future applications. The microwave photon radar, with photon as the information carrier, uses abundant spectral resources and flexible photon technology to generate and process radar wideband signals better and faster, and has the ability of fast imaging, high resolution and clear identification of targets.
Microwave photon radar prototype person in charge Li Wangzhe researcher told Science and Technology Daily reporter, the research team on the radar overall photon structure design, photon signal processing and photon photon compression processing, and imaging algorithms and other key technologies were tackled; after the experimental platform to verify the principle, Microwave anechoic chamber turntable experiments, system integration and field trials and a series of tests, the successful realization of the random targets in the air - Boeing 737 aircraft rapid imaging. Fast imaging and high resolution make it possible to identify aircraft details such as the engine, the tail, the flap guide and the number of aircraft, fully demonstrating the advantages of microwave photon radars. According to reports, in the known microwave photon radar, the Ministry of the field of imaging resolution of the highest radar, compared with similar international radar increased by about 30 times, and will continue to increase the resolution of an order of magnitude potential.
Microwave photon rapid recognition of target fine structures and features not only can be applied to the combat platform for real-time identification of miniaturized targets, but also can provide accurate environment information for unmanned intelligent devices, which is of great significance in the field of military and civilian amphibious.
Die Casting
The Die Castings that are created in this process can vary greatly in size and weight, ranging from a couple ounces to 100 pounds. One common application of die cast parts are housings - thin-walled enclosures, often requiring many ribs and bosses on the interior. Metal housings for a variety of appliances and equipment are often die cast. Several automobile components are also manufactured using die casting, including pistons, cylinder heads, and engine blocks. Other common die cast parts include propellers, gears, bushings, pumps, and Valves.
Die casting is a manufacturing process that can produce geometrically complex metal parts through the use of reusable molds, called dies. The die casting process involves the use of a furnace, metal, die casting machine, and die. The metal, typically a non-ferrous alloy such as aluminum or zinc, is melted in the furnace and then injected into the dies in the die casting machine. There are two main types of die casting machines - hot chamber machines (used for alloys with low melting temperatures, such as zinc) and cold chamber machines (used for alloys with high melting temperatures, such as aluminum). The differences between these machines will be detailed in the sections on equipment and tooling. However, in both machines, after the molten metal is injected into the dies, it rapidly cools and solidifies into the final part, called the casting. The steps in this process are described in greater detail in the next section.
Die cast parts can vary greatly in size and therefore require these measures to cover a very large range. As a result, die casting machines are designed to each accommodate a small range of this larger spectrum of values. Sample specifications for several different hot chamber and cold chamber die casting machines are given below.
Type
|
Clamp force (ton)
|
Max. shot volume (oz.)
|
Clamp stroke (in.)
|
Min. mold thickness (in.)
|
Platen size (in.)
|
Hot chamber
|
100
|
74
|
11.8
|
5.9
|
25 x 24
|
Hot chamber
|
200
|
116
|
15.8
|
9.8
|
29 x 29
|
Hot chamber
|
400
|
254
|
21.7
|
11.8
|
38 x 38
|
Cold chamber
|
100
|
35
|
11.8
|
5.9
|
23 x 23
|
Cold chamber
|
400
|
166
|
21.7
|
11.8
|
38 x 38
|
Cold chamber
|
800
|
395
|
30
|
15.8
|
55 x 55
|
Cold chamber
|
1600
|
1058
|
39.4
|
19.7
|
74 x 79
|
Cold chamber
|
2000
|
1517
|
51.2
|
25.6
|
83 x 83
|
The selection of a material for die casting is based upon several factors including the density, melting point, strength, corrosion resistance, and cost. The material may also affect the part design. For example, the use of zinc, which is a highly ductile metal, can allow for thinner walls and a better surface finish than many other alloys. The material not only determines the properties of the final casting, but also impacts the machine and tooling. Materials with low melting temperatures, such as zinc alloys, can be die cast in a hot chamber machine. However, materials with a higher melting temperature, such as aluminum and copper alloys, require the use of cold chamber machine. The melting temperature also affects the tooling, as a higher temperature will have a greater adverse effect on the life of the dies.
Materials
|
Properties
|
Aluminum alloys
|
·Low density
|
·Good corrosion resistance
|
·High thermal and electrical conductivity
|
·High dimensional stability
|
·Relatively easy to cast
|
·Requires use of a cold chamber machine
|
Copper alloys
|
·High strength and toughness
|
·High corrosion and wear resistance
|
·High dimensional stability
|
·Highest cost
|
·Low die life due to high melting temperature
|
·Requires use of a cold chamber machine
|
Zinc alloys
|
·High density
|
·High ductility
|
·Good impact strength
|
·Excellent surface smoothness allowing for painting or plating
|
·Requires such coating due to susceptibility to corrosion
|
·Easiest to cast
|
·Can form very thin walls
|
·Long die life due to low melting point
|
·Use of a hot chamber machine
|
Advantages:
|
·Can produce large parts
|
·Can form complex shapes
|
·High strength parts
|
·Very good surface finish and accuracy
|
·High production rate
|
·Low labor cost
|
·Scrap can be recycled
|
Die Casting,Aluminum Die Casting,Die Casting Parts,Zinc Die Casting
Ningbo City Yinzhou Ruican Machinery Co.,Ltd , https://www.cnruican.com