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.

今天我們給大家闡述的是機箱機柜鈑金工件折彎精度是如何掌握技巧的，這對工件的精度起著重要的因素。

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.

間隙折彎法是工件折彎加工的常用方法，是將待加工工件置于折彎機上模和下模之間，借助上、下模板的共同作用完成加工的。在加工的過程中，上下模板并不直接接觸，在工件上下兩側(cè)進行力學施加，完成折彎加工工作。

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.

以下是實施方案：

The following is the implementation plan:

1.選擇材質(zhì)均勻的板材

1. Select the plate with uniform material

材質(zhì)不均勻是影響工件折彎精度的重要因素，導致折彎加工的回彈量存在不確定性。針對此問題，應該從板材的選擇入手，盡量選擇材質(zhì)均勻的高質(zhì)量板材作為工件折彎加工的材料。與此同時，應該從板材的制造入手，借助的冶金、鍛造工藝實現(xiàn)板材質(zhì)量的提升，提高板材整體的均質(zhì)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.合理設計下模開口的角度和寬度

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

在實際的折彎加工過程中，因為不同工件的加工形狀時不一樣的，因此，需要采用不同的彎曲程度。在選擇下模開口的角度時，要選擇一個能夠滿足折彎件加工要求的下模寬度。假若下模的開口過寬，將導致被加工工件的內(nèi)彎曲圓角過大，壓力減小，導致回彈量增加，影響折彎加工的競速。當開口寬度過小時，將導致壓力過大而引起負載過大，導致工件實際尺寸“超彎”。針對此問題，應該合理設計下模開口的交付寬度。具體來說，應該選用內(nèi)彎圓角半徑與材料厚度相當?shù)牟牧献鳛檎蹚澒ぜ脑牧?，以此控制下模的開口寬度，并合理設計下模開工的角度，確保工件折彎加工的精度。

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.減小機床自身的撓曲變形

3. Reduce the bending deformation of the machine tool itself

機床自身撓曲變形的主要問題是上下滑塊的變形不一致，而且隨著加工工件的尺寸增加，撓曲變形對加工精度的影響更為突出。所以，應該對折彎機的結(jié)構(gòu)進行優(yōu)化，盡量減小機床自身的撓曲變形。具體來說，應該在上模上方設置一個斜鍥結(jié)構(gòu)，通過斜鍥結(jié)構(gòu)來對因撓曲變形造成的精度損失進行補償。在實際的加工過程中，考慮工件的材料、性質(zhì)的差異，其變形的程度是所差異的，要想實現(xiàn)較高精度的變形補償就必須進行多次測試，獲得的補償形式，之后進行批量化生產(chǎn)，確保工件的加工精度。

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、提高工件展開料的尺寸精度

4. Improve the dimensional accuracy of workpiece unfolding

機箱機柜加工過程中，工件展開料尺寸精度的提升應該熊如下兩個方面進行，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

確計算開料的長度，考慮工件尺寸的偏差值，將其納入展開料計算的當中，選擇中間值作為計算數(shù)值，同時，應該合理分配公差值。二是提高工件展開料的加工精度，降低裁剪誤差。

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.

對于每個客戶及公司而言，完善的產(chǎn)品設計流程非常重要，它是做好產(chǎn)品設計的有效保障。因此，大多工業(yè)設計公司都會根據(jù)自己的服務和特色，建立一套完整合理的產(chǎn)品設計流程，保證產(chǎn)品設計的效率和質(zhì)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.