In the wave of accelerated upgrading of the automobile manufacturing industry, turning - milling machining technology is becoming a key driving force. With the efficient mode of "multi - process integrated forming", it reshapes the production process of automobile parts, injects precise and efficient manufacturing genes into automobile manufacturing, and accelerates the process of industrial upgrading.

In traditional automobile parts manufacturing, processes such as turning and milling are scattered. Take the processing of an engine crankshaft as an example. It is necessary to complete the cylindrical turning on a lathe and then transfer to a milling machine to mill the keyway. Multiple clampings are not only time - consuming (the processing cycle of a single crankshaft exceeds 2 hours), but also easily lead to a coaxiality deviation of more than 0.05mm due to positioning errors, affecting the stability of the engine power transmission. Turning - milling machining breaks this barrier, integrating turning and milling functions into one equipment. With one clamping of the crankshaft, processes such as cylindrical precision turning, crank milling, and oil hole drilling and milling can be completed. The power turret flexibly switches between turning tools and milling tools, and with multi - axis linkage, compresses the crankshaft processing cycle to within 1 hour, and controls the coaxiality within 0.008mm, making the engine power output more stable and reducing fuel consumption by 3% - 5%.

This "process integration" mode also works in the processing of automobile gearbox and chassis parts. When processing the gearbox housing, the turning - milling composite equipment can simultaneously complete end face turning, mounting hole milling, and thread tapping, replacing the traditional combination of "lathe + machining center". The number of clampings is reduced from 5 times to 1 time, the production efficiency is increased by 40%, and the part flatness error is ≤0.01mm, ensuring the smooth shifting of the gearbox. For special - shaped parts such as the chassis suspension swing arm, turning - milling machining can mill complex curved contours and turn the connecting journal, with one - time forming accuracy reaching IT7 level, helping the automobile chassis to be lighter and have improved handling.

From fuel vehicles to new energy vehicles, turning - milling machining adapts to the manufacturing needs of diverse parts. In the processing of the cylinder block of a fuel vehicle engine, it can mill complex inner cavity structures such as cooling water jackets and oil passages, replacing EDM processing, and the processing accuracy is improved to 0.02mm, making the engine heat dissipation more efficient; for the motor housing of a new energy vehicle, using aluminum alloy materials, turning - milling machining can mill a high - precision mounting surface (flatness ≤0.005mm) and turn a thin - walled outer circle (wall thickness tolerance ±0.1mm), ensuring motor heat dissipation and structural strength, and helping new energy vehicles to have increased range.

Although the initial investment in turning - milling machining equipment is relatively high (the cost of a single unit exceeds 3 times that of an ordinary lathe), automobile manufacturing enterprises calculate the "long - term account": increased production efficiency, reduced rejection rate (from 5% to 1%), and reduced labor costs, and the equipment cost can be recovered in 3 - 5 years. With the popularization of technology and the advancement of localization, the equipment price is gradually decreasing. More and more automobile companies are embracing turning - milling machining, driving the automobile manufacturing industry to upgrade towards efficiency, intelligence, and high quality, and allowing "Made in China - Intelligent" automobiles to accelerate towards the global stage.

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