（一）尺寸精度控制，加工前的测量与校准。

（1） Dimensional accuracy control, measurement and calibration before processing.

在开始钣金机壳加工之前，要对原材料的尺寸进行测量，确保其符合要求。同时，对加工设备如激光切割机、数控冲床、折弯机等进行校准，保证设备的加工精度。例如，数控折弯机的折弯角度校准可以通过试折标准样板来实现，若偏差超出允许范围，则需进行调整。

Before starting the sheet metal casing processing, it is necessary to measure the dimensions of the raw materials to ensure that they meet the requirements. At the same time, calibration is carried out on processing equipment such as laser cutting machines, CNC punching machines, bending machines, etc. to ensure the machining accuracy of the equipment. For example, the bending angle calibration of a CNC bending machine can be achieved by bending a standard template. If the deviation exceeds the allowable range, adjustments need to be made.

加工过程中的尺寸监测。在加工过程中，采用量具如卡尺、千分尺、游标角度尺等对关键尺寸进行实时监测。对于批量加工的产品，还可以设置抽检制度，每隔一定数量的产品抽取一件进行全尺寸检验，及时发现尺寸偏差并采取纠正措施。

Dimensional monitoring during the processing. During the processing, measuring tools such as calipers, micrometers, and vernier universal angle gauges are used to monitor key dimensions in real-time. For mass-produced products, a sampling system can also be established, where one piece is selected from a certain number of products for full-size inspection to promptly detect dimensional deviations and take corrective measures.

（二）表面质量控制，加工参数优化。

（2） Surface quality control and optimization of processing parameters.

在切割、折弯、焊接等加工过程中，合理调整加工参数以避免表面缺陷。例如，激光切割时，根据材料的种类和厚度调整激光功率、切割速度和辅助气体压力，防止出现切口粗糙、挂渣等现象；折弯时，选择合适的模具和折弯力，避免造成表面划伤或压痕。

Reasonably adjust processing parameters during cutting, bending, welding, and other machining processes to avoid surface defects. For example, during laser cutting, adjust the laser power, cutting speed, and auxiliary gas pressure according to the type and thickness of the material to prevent rough cuts, slag hanging, and other phenomena; When bending, choose the appropriate mold and bending force to avoid surface scratches or indentations.

表面处理质量控制，在电镀和喷涂等表面处理工序中，严格控制处理工艺参数。电镀时要控制好电镀时间、电流密度等，确保镀层厚度均匀、结合牢固；喷涂时要保证涂层的厚度适中、均匀，无流挂、气泡等缺陷。同时，要对表面处理后的成品进行外观检查，不合格品要及时返工。

Quality control of surface treatment, strict control of treatment process parameters in surface treatment processes such as electroplating and spraying. During electroplating, it is necessary to control the electroplating time, current density, etc. to ensure uniform coating thickness and firm bonding; When spraying, it is necessary to ensure that the thickness of the coating is moderate, uniform, and free of defects such as sagging and bubbles. At the same time, a visual inspection should be conducted on the finished products after surface treatment, and any non-conforming products should be promptly reworked.

（三）装配质量检查，零部件的装配精度。

（3） Assembly quality inspection, assembly accuracy of components.

在将各个钣金零部件组装成机壳时，要保证装配精度。例如，机箱的面板与箱体之间的间隙要均匀，门的开合要顺畅，不能有松动或卡滞现象。这需要在装配过程中使用合适的工装夹具，按照规定的顺序和方法进行装配，并对装配后的整体结构进行检查。

When assembling various sheet metal components into the casing, it is necessary to ensure assembly accuracy. For example, the gap between the panel of the chassis and the box body should be uniform, and the opening and closing of the door should be smooth without any looseness or jamming. This requires the use of appropriate fixtures during the assembly process, assembly in the prescribed order and method, and inspection of the overall structure after assembly.

功能性测试，对于一些带有电气元件或机械传动部件的机壳，要进行功能性测试。如检查机箱内部的布线是否整齐合理，有无短路、断路等问题；对于带有散热风扇的机壳，要测试风扇的运转是否正常，通风散热是否良好。只有通过各项功能性测试的机壳才能判定为合格产品。

Functional testing is required for some enclosures with electrical components or mechanical transmission parts. Check whether the wiring inside the chassis is neat and reasonable, and whether there are any short circuits, open circuits, or other issues; For enclosures with cooling fans, it is necessary to test whether the fan operates normally and whether the ventilation and heat dissipation are good. Only casings that have passed various functional tests can be judged as qualified products.