The development of numerical control technology ensures the quality and performance of numerical control machine tools in China. Due to the strong adaptability of CNC machine tool to workpiece modification, high machining accuracy of sheet metal cabinet and chassis, high productivity and other characteristics, CNC technology has been widely used in sheet metal machine tool, which solves the problems of high precision and complex shape in sheet metal processing. The application in production greatly improves the sheet metal processing capacity, ensures the sheet metal parts in quality and output, and greatly reduces the labor intensity of workers.

今天我们给大家阐述的是机箱机柜钣金工件折弯精度是如何掌握技巧的，这对工件的精度起着重要的因素。

Today we are going to explain how to master the bending accuracy of the sheet metal parts of the chassis cabinet, which plays an important role in the accuracy of the parts.

间隙折弯法是工件折弯加工的常用方法，是将待加工工件置于折弯机上模和下模之间，借助上、下模板的共同作用完成加工的。在加工的过程中，上下模板并不直接接触，在工件上下两侧进行力学施加，完成折弯加工工作。

Gap bending method is a common method of workpiece bending, which is to place the workpiece to be processed between the upper die and the lower die of the bending machine, and complete the processing with the help of the joint action of the upper and lower templates. In the process of processing, the upper and lower templates are not in direct contact with each other, and the mechanical force is applied on both sides of the workpiece to complete the bending process.

以下是实施方案：

The following is the implementation plan:

1.选择材质均匀的板材

1. Select the plate with uniform material

材质不均匀是影响工件折弯精度的重要因素，导致折弯加工的回弹量存在不确定性。针对此问题，应该从板材的选择入手，尽量选择材质均匀的高质量板材作为工件折弯加工的材料。与此同时，应该从板材的制造入手，借助先进的冶金、锻造工艺实现板材质量的提升，提高板材整体的均质性。

Uneven material is an important factor affecting the bending accuracy of workpiece, which leads to the uncertainty of springback in bending. In view of this problem, we should start from the selection of plate, try to choose high-quality plate with uniform material as the material of workpiece bending. At the same time, we should start from the plate manufacturing, with the help of advanced metallurgy, forging process to improve the quality of the plate, improve the overall homogeneity of the plate.

2.合理设计下模开口的角度和宽度

2. Reasonably design the angle and width of the lower die opening

在实际的折弯加工过程中，因为不同工件的加工形状时不一样的，因此，需要采用不同的弯曲程度。在选择下模开口的角度时，要选择一个能够满足折弯件加工要求的下模宽度。假若下模的开口过宽，将导致被加工工件的内弯曲圆角过大，压力减小，导致回弹量增加，影响折弯加工的竞速。当开口宽度过小时，将导致压力过大而引起负载过大，导致工件实际尺寸“超弯”。针对此问题，应该合理设计下模开口的交付宽度。具体来说，应该选用内弯圆角半径与材料厚度相当的材料作为折弯工件的原材料，以此控制下模的开口宽度，并合理设计下模开工的角度，确保工件折弯加工的精度。

In the actual bending process, because the processing shapes of different workpieces are different, different bending degrees are needed. When selecting the opening angle of the lower die, it is necessary to select a width of the lower die that can meet the processing requirements of the bending parts. If the opening of the lower die is too wide, the inner bending fillet of the workpiece will be too large, the pressure will be reduced, the springback will increase, and the speed of bending will be affected. When the opening width is too small, the pressure will be too large and the load will be too large, resulting in the actual size of the workpiece "over bending". To solve this problem, the delivery width of the lower die opening should be designed reasonably. Specifically, we should choose the material with the same fillet radius and material thickness as the raw material of the bending workpiece, so as to control the opening width of the lower die, and reasonably design the starting angle of the lower die, so as to ensure the accuracy of the workpiece bending.

3.减小机床自身的挠曲变形

3. Reduce the bending deformation of the machine tool itself

机床自身挠曲变形的主要问题是上下滑块的变形不一致，而且随着加工工件的尺寸增加，挠曲变形对加工精度的影响更为突出。所以，应该对折弯机的结构进行优化，尽量减小机床自身的挠曲变形。具体来说，应该在上模上方设置一个斜锲结构，通过斜锲结构来对因挠曲变形造成的精度损失进行补偿。在实际的加工过程中，考虑工件的材料、性质的差异，其变形的程度是所差异的，要想实现较高精度的变形补偿就必须进行多次测试，获得的补偿形式，之后进行批量化生产，确保工件的加工精度。

The main problem of bending deformation of machine tool itself is that the deformation of upper and lower sliders is inconsistent, and with the increase of workpiece size, the influence of bending deformation on machining accuracy is more prominent. Therefore, the structure of the bending machine should be optimized to minimize the bending deformation of the machine itself. Specifically, a wedge structure should be set up above the upper die to compensate the accuracy loss caused by the bending deformation. In the actual processing process, considering the differences of materials and properties of the workpiece, the degree of deformation is different. In order to achieve higher accuracy of deformation compensation, it is necessary to carry out multiple tests, obtain the compensation form, and then carry out mass production to ensure the machining accuracy of the workpiece.

4、提高工件展开料的尺寸精度

4. Improve the dimensional accuracy of workpiece unfolding

机箱机柜加工过程中，工件展开料尺寸精度的提升应该熊如下两个方面进行，一是精

In the process of cabinet processing, the improvement of the dimensional accuracy of workpiece unfolding should be carried out in the following two aspects: one is precision

确计算开料的长度，考虑工件尺寸的偏差值，将其纳入展开料计算的当中，选择中间值作为计算数值，同时，应该合理分配公差值。二是提高工件展开料的加工精度，降低裁剪误差。

In order to calculate the cutting length, the deviation of workpiece size should be taken into account, and the intermediate value should be selected as the calculation value. At the same time, the tolerance value should be reasonably allocated. The second is to improve the processing accuracy of the workpiece unfolding and reduce the cutting error.

对于每个客户及公司而言，完善的产品设计流程非常重要，它是做好产品设计的有效保障。因此，大多工业设计公司都会根据自己的服务和特色，建立一套完整合理的产品设计流程，保证产品设计的效率和质量。

For each customer and company, perfect product design process is very important, it is an effective guarantee for good product design. Therefore, most industrial design companies will establish a complete and reasonable product design process according to their own services and characteristics to ensure the efficiency and quality of product design.