The high-pressure screen frame processed by our company for ANDRITZ (China) Co., Ltd. is made according to the process provided by the customer. After assembly, the customer repeatedly reported that the inner holes of the flanges at both ends of the screen frame were large and elliptical, which affected the assembly. After analysis by our technical staff, it was found that the process provided by the customer was unreasonable. According to the customer's process, the inner holes of the flanges at both ends of the screen frame were finished in the second processing step. However, the customer failed in the second processing step. After completion, the inner screen plate must be welded. The welding process will cause the inner hole of the flange to deform. Therefore, our customer suggested that when processing the inner hole of the screen frame flange in the second process, do not process it in place and leave a 1mm margin; after the inner screen plate is welded and the third processing process is carried out, the screen frame flange should be processed again. Finishing of the inner hole. After the customer accepted our suggestion, our company processed and produced it according to the improved process, which completely solved the problem of the oval inner hole of the flange, and the customer's assembly progress was significantly improved.