The bearing housing has short delivery time and difficult processing. The thinnest part of the bearing hole wall is only 37mm, which is extremely easy to deform, which directly affects the shape and position accuracy of the bearing hole and the symmetry of the skateboard surface on both sides. According to the characteristics of this bearing seat, combined with the existing equipment and production conditions of the branch, we have taken effective measures in the process and management to ensure the processing progress and processing quality of the workpiece.
The main hole and the end surface of the vertical machine are processed, and the single-sided amount is 4 to 5 mm, and the surface roughness is Ra3.2Lm for flaw detection, and serves as a follow-up reference. Arrange the low-precision milling machine to machine the plane, and then machine the bevel and R part from the boring machine to achieve a surface roughness of Ra=3.2Lm. In this way, you can make full use of equipment capabilities, increase productivity, and reduce costs.
(1) Go to the flash burr, the sharp corners are dull.
(2) Polish all sides of the knife and R60 to ensure the flaw detection requirements.
(3) Print the record to avoid confusion around the branch process.
The magnetic inspection process after processing can only inspect shallow surface defects. When finishing, the magnetic detection part will be completely processed. The magnetic exploration has no practical significance. To reduce the cost, the magnetic detection is cancelled. The semi-finished bearing hole and end face of the vertical car are made of ZG34CrNiMo, the material is determined according to the material, and the surface roughness of the inner hole is required to reach Ra=3.2Lm, and the end face is perpendicular to the hole.
After the semi-finished bearing hole, the magnetic inner hole is arranged to focus on the inner hole blank defect. After the blank defect treatment, it is necessary to re-finish the car to find the positive belt and the end face, and the surface roughness is Ra=3.2Lm. Finishing appearance I only have one digital boring machine in the factory. It is neither realistic nor economical to rely on it to complete the finishing appearance. Therefore, the process must be refined. The principles to be followed are:
(1) The finishing of the external shape always adopts the principle of unified reference, and the processing of each process is based on the bearing hole;
(2) High-precision machine tool processing key processes to ensure quality and improve production efficiency.
Magnetically inspecting all the finished bearing housings, it is easy to scratch the bearing holes, and it is not conducive to the processing of blank defects. After finishing the outer shape, the magnetic probing shape is arranged in front of the inner hole of the fine car to further check the blank of the casting, which avoids the difficulty in processing the blank defect after finishing the inner hole, and also avoids the magnetic hole in the inner hole after finishing the car. Pulling, affecting the phenomenon of surface roughness. The bearing hole of the finishing car is based on the principle of mutual reference. When finishing the inner hole of the car, it must be corrected according to the finishing surface and the inner hole. At the same time, the symmetry of the inner hole and the sliding surface should be checked. If there is any error, adjustment must be made. Tight, centered, after grinding the car, use the abrasive belt to grind the inner hole pattern. This not only ensures the symmetry of the bearing hole and the sliding surface, but also avoids the deformation caused by the thin wall. Drilling uses self-made tooling to ensure the interchangeability of the end cover and the bearing seat, as well as the positioning accuracy and assembly quality of the end cap and the bearing seat. If macroscopic visible blank defects still occur after finishing, magnetic exploration is required.
Management method Because the contract delivery time is too short, it is impossible to complete the task according to the regular organization of production, so a new management method is adopted. According to the unified benchmark principle and agile engineering principle, our branch adopts one part, one drawing, one process, one material card, one inspection record and unified bagging management mode and multi-process parallel process flow. Using the labor, material and equipment processing capabilities of the branch, reducing the turnaround time of the workpiece and improving production efficiency. Therefore, after taking the above measures, the circumscribed machining of the main hole of the work roll chock is easy to avoid, and the rough defect processing after the inner hole of the fine car is difficult, and the processing task of the work roll chock is completed on schedule. And the inspection is qualified. The process plan and production management mode can be widely used in the processing of various work roll chocks.
(Finish)
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Taizhou Runde Company , https://www.nerausmotor.com