北京通风管道优质加工厂

(1)、 为了保证加工精度，粗、精加工最好分开进行。因为粗加工时，切削量大，工件所受切削力、夹紧力大，发热量多，以及加工表面有较显著的加工硬化现象，工件内 部存在着较大的内应力，如果粗、粗加工连续进行，则精加工后的零件精度会因为应力的重新分布而很快丧失。对于某些加工精度要求高的零件。在粗加工之后和精 加工之前，还应安排低温退火或时效处理工序来消除内应力。 　　

(1) in order to ensure the accuracy of processing, it is best to separate the rough and finish. Because when rough machining, cutting quantity is big, the workpiece by cutting force, clamping force, heat, and the machining surface has the obvious work hardening phenomenon, there are large internal stress artifacts interior, if rough, rough machining, row after finishing the parts precision will soon lost because of the stress redistribution. For parts with high accuracy requirements. Low temperature annealing or aging process should be arranged to eliminate internal stress before and after processing and processing.

(2)、合理地选用设备。粗加工主要是切掉大部分加工余量，并不要求有较高的加工精度，所以粗加工应在功率较大、精度不太高的机床上进行，精加工工序则要求用较高精度的机床加工。粗、精加工分别在不同的机床上加工，既能充分发挥设备能力，又能延长精密机床的使用寿命。 　　

(2) the equipment should be chosen rationally. Roughing cut off most of the machining allowance, does not require high machining accuracy, so rough machining should be bigger in the power and the high accuracy of machine tools, finishing process demands with relatively high precision machine tool processing. The processing of coarse and finishing machines on different machine tools can make full use of the equipment and extend the service life of precision machine tool.

(3)、 在机械加工工艺路线中，常安排有热处理工序。热处理工序位置的安排如下：为改善金属的切削加工性能，如退火、正火、调质等，一般安排在机械加工前进行。为 消除内应力，如时效处理、调质处理等，一般安排在粗加工之后，精加工之前进行。为了提高零件的机械性能，如渗碳、淬火、回火等，一般安排在机械加工之后进 行。如热处理后有较大的变形，还须安排最终加工工序。

(3) the process of heat treatment is often arranged in the process of mechanical processing. The arrangement of the heat treatment process is as follows: to improve the machining properties of metal, such as annealing, positive fire, and adjustment, the general arrangement is carried out before machining. In order to eliminate internal stress, such as adverse treatment and adjustment, it is usually arranged in rough processing before processing. In order to improve the mechanical properties of the parts, such as carburizing, quenching, tempering, etc., it is usually arranged after machining. If there is a large deformation after heat treatment, the final processing procedure must be arranged.