■ Before improvement
■ After improvement
When assembling a car frame, components such as cross beam and connecting plate are usually assembled online in the form of parts. Due to many factors, such as the complex structure of heavy-duty truck frame, narrow assembly space, etc., the assembly of parts such as transmission shaft beam, corner brace tail beam and traction seat is difficult, the work efficiency is low, and the working attitude evaluation level is high. In order to solve these problems, they conducted in-depth on-the-spot investigation and counted the beam types of related vehicles. On the premise of ensuring the accuracy of the system data, they designed and manufactured special tooling, and made the parts such as cross beam, connecting plate, corner brace and traction seat into a process assembly, forming a "modular" form, and then sent them to the assembly workshop for on-line assembly after off-line sub-packaging. This not only improves the assembly efficiency, but also reduces the evaluation level of working posture and eliminates the difficulty of field operation. Through modularity, the frame factory has optimized more than 300 kinds of beam structures, and the beam assembly is on-line once, which greatly improves the assembly efficiency. The total assembly JPH of the frame line of the engineering vehicle with complex structure is increased from 7.3 to 10.7. The implementation of the process optimization scheme ensures the high production of the frame factory and Dongfeng commercial vehicle company better and more favorably.