Body frame is a common manufacturing method of motor vehicles, in which a separate body or bus is mounted on a solid and relatively rigid frame or chassis, which carries the power system (engine and transmission system), wheels and their suspension, and is equipped with brakes and steering. Although this was the original method of making cars, the body frame structure is now mainly used for heavy trucks, pickup trucks and large SUVs.

In the late 19th century, frames, like the cars they replaced, might have been made of wood (usually ash) and reinforced with steel baffles - but in the early 20th century, steel ladder frames or chassis quickly became standard. The mass production of all metal body started from Bud and Dodge Brothers. Mass production of all metal car bodies became common in the 1920s, but Europe (except for exceptions) followed suit nearly a decade later. Customized or "passenger car manufacturing" cars in Europe usually contain some wooden frames or used aluminum alloy castings. At the beginning of international automobile assembly and construction, most manufacturers created a rolling chassis consisting of powertrain, suspension, steering column and fuel tank, and then sent it to the body manufacturer, who added the body, interior and trim according to the specific requirements of customers.

In contrast, the Unibody or single shell design, in which the panel inside the body supports the suspension of the car, was developed by European manufacturers in the late 1920s with BuddUSA (with many large factories in Europe) and its technical knowledge. But it did not appear in the United States until the 1950s and generally later. Because the cost of designing and developing these structures is very high, and the cost of special machinery for large presses required for manufacturing this structure is very high, small batch manufacturers do not use it, and they may build equivalent structures by welding steel pipes. Suitable space frame.

Easier to design, build, and modify. The frame can be simplified to adapt to different body designs, reduce costs and manufacturing requirements.

The noise is less when driving, because the groans, squeaks and rattles usually related to the body movement caused by stress and strain are not heard, and the road noise from the tires is more "remote". All these are due to the isolation of the body from the chassis by the rubber pads around the connecting bolts, or the suspension of the body on the chassis.

It is easier to repair after an accident. Body damage is not very important structurally; This means that the panel can usually be replaced more easily, and the vehicle can return to the "roadworthy" state more quickly - while the integrated vehicle may require professional repair, resulting in a long delay before the vehicle runs again.

More torsional bending can be allowed before yielding (truck, truck SUV, off-road)

Trucks, real off-road SUVs and other vehicles mounted on independent chassis heights are unlikely to rust due to moisture, soil, stones, road grit, water, snow and other more serious damage (such as gearbox or engine oil). The damage to the oil pan is usually caused by rocks.

Our Strength

The first phase of July 2018 preparatory construction is basically completed, mainly with Austrian technology - EBNER production of all-hydrogen bright hood annealing furnace. Comprehensive industry advanced technology can eliminate rolling stress and annealing stress AGC mill, rolling thickness 0.8 ~ 13mm width 29 ~ 500mm, strip sickle bay ≤ 2mm / m. Strip thickness gauge adopts German joint venture X-ray thickness gauge, strip thickness tolerance can meet the high requirements of customers (tolerance accuracy of each level of increase, the rate of finished product will be reduced by 1.5 ~ 2% so a price increase of 200 yuan / ton). Precision slitting machine with double knife base and double reel, slitting width 29～500mm.

The second phase of the main plant to build an additional 10,000m². Equipment mainly has Austrian technology can produce width <800mm thickness <4mm strip quenching line a (can fill the domestic blank, expected capital 15 million, monthly output of 1,000 tons). Put in an annual output of 60,000 tons of thickness <13mm, width <800mm high-pressure water surface oxide treatment production line (estimated capital 10 million), an additional annual output of 60,000 tons of φ380x1000 ~ 1500mm wide plate slitting production line (estimated capital 4 million), two high-precision AGC rolling mill (estimated capital 7 million), two narrow strip slitting machine (estimated capital 5 million). million).