The plaintiff and the defendant signed a "Customized Processing Contract" on a certain day in a certain year. The plaintiff ordered a gantry milling machine from the defendant. The quality standards were processed and manufactured according to the technical plan provided by the plaintiff. The two parties signed the "Gantry Milling Machine Supply Plan", which stipulated the use of the machine tool, structural performance, machine tool control, technical parameters, installation, commissioning and acceptance. In the installation, commissioning and acceptance terms, the two parties agreed that in accordance with the "Gantry Boring and Milling Machine Accuracy Inspection" (Machinery Industry Standard of the People's Republic of China), the engineering and technical personnel of both parties will conduct inspections. The defendant provided the "Accuracy Inspection of Gantry Boring and Milling Machines" (Machinery Industry Standard of the People's Republic of China). After the
equipment was shipped to the plaintiff for installation, the plaintiff discovered that there were quality problems with the equipment. As a result, the two parties had a dispute over whether there were quality problems with the "gantry milling machine" involved in the case and could not mediate. Therefore, the plaintiff proposed to conduct quality appraisal of the "gantry milling machine" involved in the case.
was entrusted by the court to conduct an appraisal and analysis on "whether there are quality problems" with the gantry milling machine involved in the case.
appraisal analysis results: The
appraisal expert group conducted a discussion and comprehensive technical analysis on the relevant information, on-site investigation and test data of the "Gantry Milling Machine" involved in the case, and concluded that:
1, the large bed straightness, worktable flatness, and vertical movement of the milling head of the "Gantry Milling Machine" involved in the case are detrimental to the work. The verticality of the movement of the worktable, the verticality of the spindle rotation axis to the movement of the worktable along the X-axis, the parallelism of the worktable to the movement of the worktable, the radial runout of the spindle, the radial runout of the centering shaft, the end face runout, and the periodic axial movement all do not meet the geometric accuracy requirements in GB/T19362.1-2003 "Accuracy Inspection of Inspection Conditions for Gantry Milling Machines Part 1: Fixed Gantry Milling Machines";
2. The small bed guide rails of the "machine tool" involved in the case have defects such as scratches, pores and shrinkage, and the large bed guide rails have repair marks in many places.
