With the discovery of the times, mechanical processing has gradually emerged many advanced mechanical teaching and technical methods, but in the actual machining process, common problems such as low machining accuracy, mechanical vibration, and deformation of stressed parts are inevitable. These issues can lead to quality performance and productivity of machined products. So how to reduce the occurrence of these problems? PSSE has compiled the following tips and principles for you, hoping to help you.
1. Coarse and fine should be separated to ensure machining accuracy
Due to the large amount of cutting during roughing, the cutting force and clamping force on the workpiece are also large, and the heat generation is also large. The machined surface will have a relatively obvious work hardening phenomenon, and there will also be large internal stress inside the workpiece. If rough machining Finish machining immediately after finishing, then the accuracy of the finished part will be affected by the redistribution of stress. For some workpieces with high finishing, low-temperature annealing or aging treatment should be performed after rough machining to eliminate internal stress, and then finishing.
2. Select machining equipment with corresponding precision
We all know that the precision requirements of roughing and finishing are different, so the selected equipment should also be different. Choose machining equipment with high power and relatively low precision. For finishing, high-precision machining equipment should be used. Distinguishing options can not only give full play to the capabilities of the equipment, but also prolong the service life of the machine tool and improve the efficiency of machining.
3. Reasonable selection of machining process
When planning the machining process, heat treatment is very important, and different heat treatment arrangements should be carried out for different machining processes. In order to improve the machinability of the metal before machining, heat treatment such as annealing, normalizing, quenching and tempering is required; in order to eliminate internal stress after rough machining, heat treatment such as aging treatment, quenching and tempering treatment is required; after machining, in order to improve the The mechanical properties of the workpiece require heat treatment such as carburizing, quenching, and tempering.
4. Prevent slippage during machining
When the pulley is driven in the machining process, the pulley often slips between the axle and the axle. Use a 15~18mm dimple drill to make a series of pockets on the axle, which can form an adsorption force to prevent slippage, and the boss will reward you for turning waste into treasure.
Four principles
1. Benchmark first
Before machining, first determine a datum plane, the purpose is to have a positioning reference during subsequent processing, after the datum plane is determined, and then the datum plane must be processed first.
2. Divide the processing stage
When the product is mechanically processed, it needs to be processed to different degrees according to different product requirements, and the processing degree needs to be divided. If the precision requirements are not high, then a simple roughing stage will do. The schedule requirements of the products are becoming more and more strict, and the semi-finishing and finishing stages will be carried out later.
3. Face first and then hole
When machining, for a workpiece such as a bracket, the brake needs both plane machining and mechanical hole machining. In order to reduce the accuracy error of the machined hole, machining the plane first and then machining the hole is beneficial to reduce error.
4. Finishing
This processing principle is roughly some grinding and polishing processing, which is usually a step after the product is completely completed.