TRW Automotive recently announced that the 24GHz AC100 radar system developed by the company has received widespread attention from users around the world. TRW is currently working with several OEMs to develop this product.
It is reported that the 24GHz AC100 radar system provides a variety of safety features, including distance and collision warning, urban security, automatic tracking and parking adaptive cruise control (ACC) and reversible restraint and braking systems (such as pre-braking and adaptive brake assist systems, etc. ). Peter Lake, executive vice president of sales and business development at TRW, commented: “The AC100 system can provide most of the features of the company’s earlier-developed product, the 77-GHz radar system, but at a significant cost reduction. Initially, radar technology was applied only to high-end vehicles. It is indeed costly for the end user. The development of the AC100 system allows the vehicle market to benefit from advanced safety technologies in a wider range."
The reporter learned that the European Commission had received relevant proposals and suggested that since 2013, all medium-sized and heavy-duty commercial vehicles have been forced to install automatic emergency braking systems. Peter Lake pointed out: "TRW's AC100 system, coupled with a front-view camera lens, will be an ideal configuration for truck manufacturers."
When it comes to Adaptive Cruise Control (ACC), the 24GHz system works like a standard cruise control system. The vehicle travels at a given speed until there is a low-speed vehicle in front, and then the vehicle automatically brakes, then accelerates as needed to ensure that the driver's selectable distance is maintained after the vehicle is driven at low speed (equal time distance). The information collected by the radar is parsed by the electronics in the adaptive cruise control (ACC) unit.
Peter Austen, head of TRW’s DAS business, said: “The AC100 radar product can acquire data up to a distance of about 150 meters and is suitable for a wide range of driving conditions including on the freeway. In addition, radar technology can All-weather operation is different from laser systems that rely on optical image clarity."
At the same time, TRW is developing its third-generation 77GHz radar and setting up a radar production base in Brest, France, to manufacture the radar unit. At present, the base supplies second-generation 77GHz radar system products to many passenger car and truck manufacturers.
"Gravity Die Casting. A permanent mould casting process, where the molten metal is poured from a vessle of ladle into the mould, and cavity fills with no force other than gravity, in a similar manner to the production of sand castings, although filling cn be controlled by tilting the die."
Gravity Die Casting
Sometimes referred to as Permanent Mould, GDC is a repeatable casting process used for non-ferrous alloy parts, typically aluminium, Zinc and Copper Base alloys.
The process differs from HPDC in that Gravity- rather than high pressure- is used to fill the mould with the liquid alloy.
GDC is suited to medium to high volumes products and typically parts are of a heavier sections than HPDC, but thinner sections than sand casting.
There are three key stages in the process.
- The heated mould [Die or Tool] is coated with a die release agent. The release agent spray also has a secondary function in that it aids cooling of the mould face after the previous part has been removed from the die.
- Molten metal is poured into channels in the tool to allow the material to fill all the extremities of the mould cavity. The metal is either hand poured using steel ladles or dosed using mechanical methods. Typically, there is a mould [down sprue" that allows the alloy to enter the mould cavity from the lower part of the die, reducing the formation of turbulence and subsequent porosity and inclusions in the finished part.
- Once the part has cooled sufficiently, the die is opened, either manually or utilising mechanical methods.
Advantages
- Good dimensional accuracy
- Smoother cast surface finish than sand casting
- Improved mechanical properties compared to sand casting
- Thinner walls can be cast compared to sand casting
- Reverse draft internal pockets and forms can be cast in using preformed sand core inserts
- Steel pins and inserts can be cast in to the part
- Faster production times compared to other processes.
- Once the tolling is proven, the product quality is very repeatable.
- Outsourced Tooling setup costs can be lower than sand casting.
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