No matter what kind of refrigerated vehicle we want to buy, we certainly hope that the quality can be better, it is best to ensure a relatively high cost performance, but also to ensure that vehicles can be used for a longer time. The price of the 9.6- meter refrigerated truck itself is not too low, even for some small-brand vehicles, so we must pay special attention to the overall quality. Now that there are many brands of refrigerated trucks in the market, the quality of each brand's vehicles is different, and the price will be very different. So what kind of brand vehicle quality is better?
First, look at annual sales. In fact, when we buy a 9.6- meter refrigerated truck , it is best to be able to look at how the sales are. We must be able to understand what type of vehicle is the best, so comparing the annual sales is also very important. If consumers are very much convinced of a brand and the sales volume is relatively high, it also proves that its price/performance ratio is definitely quite good, otherwise it will not be recognized by consumers.
Second, look at the brand's services. Because the price of 9.6- meter refrigerated trucks is still relatively high, and we usually use such vehicles, we must pay special attention to what the other party provides. This type of vehicle brand is not only to provide us with quality vehicles, but also need to compare what specific services are. If we can provide a better after-sales service, such a branded business is certainly our first choice.
Third, see how physical vehicles are. We had better be able to go directly to some companies to see how the quality of the 9.6- meter refrigerated truck is. In this way we can see what kinds of vehicles meet our requirements. The best advice is to be able to consider the overall price/performance ratio and then choose based on our actual situation. As long as there is no problem with the quality of the vehicle, naturally there is no need to worry about other situations, and a higher price/performance ratio can also be guaranteed.
Now every country optimistic about the prospect of the magnesium alloy die castings,especially in auto,aviation,telecom,transportation and mechanical industry,
which adopt to use magnesium alloy die casting to replace steel casting for reducing weight effectively and then can save energy and reduce environment pollution. The car can decrease 0.4L oil consumption per kilometer if it can relieve every 100KGS. So America,Japan and European countries have enlarge use of magnesium alloy Die Casting Parts, for example, steering wheel, instrument panel, seat skeleton, crankcase, gearbox shell, wheel hub and so on. So magnesium alloy die castings grows at 20%~30% a year, 80% of them are die casting parts. Meanwhile magnesium alloy die castings expand use in appliance light industry and daily hardware, such as notebook shell, VCR box, mobile phone, power tool shell,camera shell, upholstery, mower shell etc. These magnesium alloy die casting parts with a series of advantages, not only greatly reduce weight, but also have the precise & steady dimension and smooth finish surface.
Die-cast magnesium alloy material:
Magnesium and aluminum have big differences in the chemical, physical properties, mainly in terms of chemical reactivity, surface oxidation of the liquid metal
material tightness, thermal effects during solidification, resistant to electricity chemical corrosion resistance capabilities.
Magnesium has a strong chemical reactivity than aluminum and the metal bath surface can not be formed as dense as molten aluminum alloy oxide protective film
to prevent oxidation reaction to proceed, so magnesium alloy flammable or explosive. Magnesium alloy is also easy to dissolve other metals, including magnesium
alloy severely reduce the ability of anti-electrochemical corrosion of nickel, copper and other elements. In addition, the same volume of liquid aluminum and magnesium alloy during solidification.
Magnesium alloy heat release was significantly lower than aluminum.
Magnesium alloy chemical elements:
Mechanical properties of pure magnesium is very poor, can not meet the requirements of industrial parts of the yield strength and tensile strength. By adding alloying elements can significantly improve the mechanical properties of magnesium, the magnesium alloy`s strength to weight than the titanium alloy in all kinds of alloying and ranked second, open up broad prospects for its application.
The effect of alloying element second is to improve the performance of magnesium alloy casting. Pure magnesium have high melting point, poor mobility, high shrinkage.
By alloying can reduce the temperature of the liquid, increase liquidity. According to the characteristics of magnesium alloy decreased significantly at temperature above 150degrees Celsius and the strength of the alloy,
the third role is to enhance the creep resistance of magnesium alloy.
Magnesium alloy commonly used alloying elements are aluminum and zinc. Alloying of aluminum alloy can improve the strength and casting properties. Zinc can also improve the performance of the alloy casting. In order to ensure the casting performance, the aluminum content should be more than 3% in the die casting magnesium alloy, zinc content is less than 2%. Otherwise it is easy to produce crack.
The commonly used magnesium alloy die-casting material
Common cold chamber die casting machine injection parts must be improved to meet the needs of the magnesium alloy die casting production as follows:
1) Fast injection speed increased from 4~5m/s to 6~10m/s.
2) Reduce the time of supercharging and build pressure.
3) Improve the injection speed and injection force control.
4) Equipped with a special furnace protection gas device
The aluminum die casting part production flow chart
Commonly used materials of magnesium alloy die casting: ADC12, ZL101, ZL102,A380, AlSi9Cu3, AlSi12(Fe);
The precision of the magnesium die casting: ±0.1mm;
Smoothness of surface of rough part: Ra1.6~Ra3.2;
Shrinkage rate of Mg alloy die casting products: 0.5%;
Material wastage rate: 5%;
General magnesium die-casting machining allowance: 0.5mm~0.7mm;
Surface preparation methods: Sand blasted, Shot blasting, Powder coating, Painting, Plating, Electrophoresis, Polishing
Our company's magnesium alloy die casting production equipment and management system
Aluminum Die casting production equipment: L.K brand die casting machine From 160T, 200T, 280T, 400T, 630T, 800T and 1250T;
CNC machining center: 8 sets;
CNC lathe machine: 6 Guangzhou Machines and 7 Shenyang Machines;
Work days of one week: From Monday to Saturday;
Shift work: 2 shift per day;
Working hours: From AM 8:00 to PM 5:00;
2D and 3D drawing Software: AutoCAD, UG, Pro/E, SolidWorks 2013;
QC control: New type NANO CMM, FPI M5000 desktop metal analyzer, Easson projector, Mechanical properties tester.
The production of Magnesium die casting and QC control
Magnesium Die Casting Part, Magnesium Alloy Die Casting Part, Magnesium Die-Casting Product, Magnesium Injection Part
NINGBO BEILUN LEMA MACHINERY TECHNOLOGY CO.,LTD , http://www.china-lema.com