In recent years, due to the country’s increased investment in infrastructure, the demand for construction machinery has shown a strong growth momentum, and some manufacturers have shown a development situation that has doubled in a year, although the country has adopted steel and building materials due to local
overheating.Electrochemical aluminum and other industries are being regulated.
Compared with imported products, domestic construction machinery is characterized by low price, poor product stability, poor reliability, and backward processing of parts.With the gradual realization of the country's commitment to the WTO, the competitive advantage of prices has gradually decreasedTake the loader as an example: most of the current mainframe manufacturers and parts manufacturers are responsible for the transmission case, front frame of the torque converter housing, Most of the key components such as rear frame, boom and drive axle are processed by general equipment. The disadvantages of this processing method include: difficulty in expanding production capacity, instability in product quality, serious product backlog, and insufficient economic benefits.
Fortunately, the relatively large domestic loader manufacturers have gradually realized this problem. In terms of machine components, XGMA, Lingong, Yigong, and Lonking adopt a combination machine tool to process the boom, front frame, and rear frame, and the hole systems of the front and rear hinge frames, and the parts are clamped one at a time, and the multiple heads are processed at the same time. With the machine bed sheet hole processing one by one, the efficiency increased by 3-6 times, and the secondary positioning error caused by turning the workpiece is avoided.The precision of each hole system coordinate can be improved from ±1mm to ±0.2mm, and the coaxiality is increased from Φ0.5mm to ±0.08mm, and the parallelism of hole system is increased from Φ0.7mm to ± 0.1mm, and all precisions are ensured by the assembly accuracy of the machine itself, which lays the foundation for improving the quality of the vehicle.
The gearbox body is
Structural Parts of the loader motion system.The structural rigidity of the part itself is poor, and the machining accuracy is relatively high. No special measures are used, making the 0.08mm flatness of the interface with the transmission and the holes on it. The verticality of the surface, the center moment of each hole is difficult to guarantee.This line adopts a combination of machine tools and a small amount of general-purpose equipment combined with the flow of production operations, the production program for an annual output of 10,000 units, The most important feature of this line is that: before the blanks enter the line, vibration aging technology is used to eliminate part of the internal stress, and at the same time, the internal stress generates deformation regularity.This guarantees the flatness of 0.08mm in the large plane, and the remaining boring holes are all Φ90mm. Φ10mm hole and large plane positioning, step holes in large holes are processed twice with rough finish, when the same arbor is machined at the same time, Φ420, Φ358, Φ355, Φ342, Φ170mm and the bottom of the reverse oil cylinder are ensured to ensure the same hole. Shaft degree.The other five holes are also rough finished, and the hole coordinate size of the precision machining is guaranteed by the guide sleeve of the fixture.The advantage of this production line is streamlined operation, which greatly reduces the number of work in process and promotes the efficiency of capital operation;the main accuracy is ensured by machine tools, and the quality requirements for operators are reduced, while the product quality is stable and reliable;appropriate investment can rapidly expand the production scale and solve the problem.General machine tool processing efficiency is low, the same process requires multiple machine tool processing problems。The original box factory of XGMG Group adopts a large number of general-purpose equipment and is fully loaded.
