Hook type balance weight the balance weight is formed by lead die casting
In recent years, in order to reduce lead pollution, some well-known automobile manufacturers have begun to use zinc to make hook balance weights. Although the manufacturing process of zinc hook balance weight is the same as that of lead balance weight, the price of its raw materials is very high. The unit price of raw materials is about 50% higher than that of lead. Moreover, it is obviously inappropriate to use expensive metal zinc only as the counterweight of hook balance weight.
For a long time, the automobile hook balance weight is mostly formed by lead die casting. As a heavy metal, the harm of lead to environmental pollution and human body has been paid more and more attention. The lead-free production of automobile has been regarded as one of the symbols of environmental protection automobile.
After the lead balance weight is installed on the vehicle wheel, once the wheel is scrapped, the metal lead of the balance weight placed on the open wheel will penetrate into the ground after being exposed to the sun and rain, causing serious harm to the environment. The lead dust produced in the production process of lead balance weight also does great harm to human body, which will cause high blood lead concentration and lead poisoning of production personnel, and seriously endanger the health of operators. Moreover, the disposal of scrapped lead hook balance weights also costs a lot. During the manufacture of lead and zinc hook balance weights, the raw materials are melted into liquid, and then injected into the die-casting die for die-casting forming; Then remove the process wastes such as gate and runner after die casting (accounting for 30 ~ 50% of the product weight), and then cut and trim; Paint after. Because the electric energy consumed in the metal melting process is particularly high, its production enterprise is recognized as a high energy consuming enterprise.
The steel hook balance weight is made of ordinary steel. After extruding the shape of the balance weight and the rivet of the body, it is riveted and connected with the snap spring; It can be assembled after environmental protection coating. The steel hook balance weight is directly formed by cold extrusion (or warm extrusion) of ordinary steel at room temperature in production, with low energy consumption and process waste accounting for only 0.5 ~ 1% of the weight of parts. And its production process, use process and waste disposal do not produce any environmental protection problems, so the steel automobile hook balance weight is considered to be a new type of product.