In February, Tesla shared its Model Y production line at the Shanghai Super Factory on Weibo. What's different is that a super large die-casting machine is installed in the production line, which can produce large-scale automobile die-casting parts. The original 70 parts have been successfully combined into two large parts, and they will even be combined into one in the future. Tesla CEO Musk claimed that this will be "a revolution in auto body engineering."

An engineering perspective drawing from Tesla shows that: Compared with the 70 parts required for Model 3, the entire rear bottom of Model Y consists of only 2 parts:

The body will be drastically reduced from 70 parts to 1-2 casting parts, the body floor will be reduced in weight, the welding process will be streamlined, and the complexity will be simplified, which can better improve product consistency. The capital expenditure for all robots to assemble these parts will be significantly reduced, and the production cycle will be shorter, making it more suitable for mass production.

The production efficiency of the die-casting process is high. The high-speed and high-pressure filling can hydraulically insert the metal into the model in a short time, and it can produce parts with complex shapes, clear outlines, and thin-walled deep cavities. Are there any disadvantages to one-piece die-casting? The die-casting process is not without its shortcomings, which is why it has not been widely used in the automotive field.

First of all, super-large die-casting machines and die-casting molds are very expensive. If there is no scale benefit brought by mass production, it is difficult for car companies to bear the overall cost; due to high-speed filling and rapid cooling, if the gas in the cavity is too late to be discharged, pores and The presence of oxidized inclusions will reduce the quality of die castings.