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CNCAP is not difficult for car enterprises According to reports, the collision speed of real cars specified by CNCAP car crash test is often higher than the speed limit specified by the national safety regulations, so as to evaluate the degree of injury of the occupants in the car in a more serious collision environment. The safety performance of the test vehicle is graded based on the degree of injury in the main parts of the head, chest, legs, etc. to detect the safety performance of the car in a real collision environment.
Then, will the introduction of CNCAP lead to a large number of domestic models in the safety collision to get bad reviews? Experts from China Automotive Technology and Research Center stated that this standard is not difficult for domestic joint venture products. Because most joint venture prototypes in Europe and the United States must also consider the NCAP test.
However, the professional also reminded domestic private enterprises that they should pay more attention to improving their technical and safety standards when developing products. China's autonomous auto brands must break through the international market barrier if they want to break into the international market. This is one of CNCAP's goals.
Promoting Vehicle Safety Upgrades CNCAP is not a national mandatory standard, but rather a voluntary enterprise behavior. A domestic automotive crash safety expert said that independent third-party vehicle safety crash tests will effectively improve the safety standards of the automotive industry.
The person in charge of the China Automotive Technology and Research Center confirmed to reporters that China’s CNCAP is under construction and that it will be able to present a clear result to the public in the first half of this year. In addition, the Tsinghua University Automobile Collision Laboratory is collaborating with an overseas insurance company in this regard, and the standard setting is basically the same as that of European NCAP.
Automobile manufacturers are more cautious about CNCAP. A person from a joint-venture car manufacturer who declined to be named stated that it is roughly estimated that the cost of the new test car will cost several tens of thousands of yuan for each new CNCAP to participate in a trial of three new vehicles. This is not a small sum for small and medium-sized automobile companies. Burden; The most critical issue is to ensure CNCAP's fairness and objectivity, establish an independent oversight agency and improve the supervision process to avoid CNCAP becoming a disguised commercial behavior.
Related Links NCAP is the acronym for NewCarAssessmentProgramme, which is the new car evaluation specification. NCAP first appeared in the United States and was led by the National Road Traffic Safety Administration (NHTSA). Subsequently, countries such as Europe and Japan established relevant NCAPs. At present, the most authoritative and strictest European NCAP in the world is led by the International Automobile Federation (FIA). Its nature does not depend on any independent third-party organization of any automobile production enterprise. The funds required are provided by the European Union and are listed on an irregular basis. New cars and imported cars are subjected to crash tests.
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
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