Industry Information

After reading the processing technology of automotive parts, I am no longer afraid of being fooled by my peers

A sedan consists of over 10000 components, each of which needs to be processed and formed through different processes in order to be assembled on the car. Today, let’s take a look and understand the seven major automotive parts processing processes.

1. About Casting
Casting is the production method of obtaining products by pouring molten metal into the cavity of the mold, cooling and solidification.
In the process of automobile manufacturing, there are many parts made of cast iron, which account for about 10% of the total weight of the vehicle, such as the cylinder body, transmission case, steering case, rear axle case, brake drum, various brackets, etc.
Sand molds are usually used to manufacture cast iron parts. The raw material for sand molds is mainly sand, which is mixed with binders, water, etc. The sand mold material must have a certain adhesive strength in order to be molded into the desired shape and be able to resist the erosion of high-temperature molten iron without collapse. In order to create a cavity in the sand mold that matches the shape of the casting, it is necessary to first make a model out of wood, called a wooden mold. After the hot molten iron cools down, its volume will decrease. Therefore, the size of the wooden mold needs to be increased according to the shrinkage rate based on the original size of the casting, and the surface that needs to be machined should be correspondingly thickened.
Hollow castings need to be made into sand cores and corresponding core wooden molds (core boxes). With a wooden mold, you can create a hollow sand mold (casting is also known as “flipping”). When manufacturing sand molds, it is necessary to consider how the upper and lower sand boxes can be separated to remove the wooden mold, as well as where molten iron flows in and how to fill the cavity to obtain high-quality castings. After the sand mold is made, it can be poured, which means pouring molten iron into the cavity of the sand mold. During pouring, the temperature of molten iron is between 1250-1350 degrees, and during melting, the temperature is even higher.
2 About Forging
In the automotive manufacturing process, forging is widely used as a processing method. Forging is divided into free forging and model forging. Free forging is a processing method of forming metal blanks by placing them on an anvil to withstand impact or pressure (commonly known as “forging”). The rough parts of automotive gears and shafts are processed using the method of free forging.
Model forging is a processing method in which metal billets are placed in the cavity of a forging die and subjected to impact or pressure to form. Model forging is a bit like the process of pressing dough into the shape of a biscuit in a mold. Compared to free forging, the shape of the workpiece produced by die forging is more complex and the size is more accurate. Typical examples of automotive die forgings are: engine connecting rods and crankshafts, front axles, steering knuckles, etc.