气弹簧

1.翻边成形工艺
翻边是将工件孔边缘或外缘在模具的作用下，翻边竖立边缘的冷冲工序。根据工件边缘的性质，翻边还可以分为孔翻边和外缘翻边，包括圆孔和非圆孔翻边；外凸曲线和内凹曲线翻边；平面和曲面翻边等。当工件的边缘为一条直线时，翻边变形成为弯曲变形，所以弯曲是翻边的种特殊形式。由此可见，在非封闭曲线翻边中，防止工件侧滑，是翻边质量的关键，在设计这类模具时，确保获得较大的初始预压力是非常必要的。目前常规的弹性元件，在预压力和工作行程上都难以满足要求，而氮气弹簧却能很容易满足工艺需要，它具有足够大的行程，具有足够大的弹压力可供选择，都不需要预紧，可以达到设计者的要求，从而非常可靠和稳定地翻边工件尺寸精度和成形质量。当今冷冲压工艺中，常见的翻边质量问题，大部分是由于工件预压不紧所造成的，尤其是在汽车覆盖件翻边中，更为常见。氮气弹簧的出现为有效解决这个问题。开拓了光明的前景。
起伏成形是一种使材料拉伸，形成局部的凹进或凸起，改变毛坯形状的冷冲压工艺方法，它主要用于压制加强筋，来提高工件的刚度，减轻重量。对于某些具有连续凸筋的零件，由于受到材料延伸率的限制，难以一次压筋成形，采用氮气弹簧可以在一套模具中，根据不同的行程长度，分段阶梯成形，非常有效地解决这种问题，提高冲压生产率。解决这一类零件的问题主要是能够很好地定位，同时还能使零件获得预成形，完全消除了材料在成形过程中，相互牵制作用，有效地材料成形的顺序，零件的质量。
2.冲裁卸料、顶件与整形
冲裁是利用冲模使材料分离成两部分的冷冲压工序，将工件或废料从凸模上卸下称为卸料，将工件或废料从凹模中顺着冲裁方向推出称为推件，逆着冲裁方向从凹模中顶出称为顶件。这是在冲裁工艺中极为常见的动作。但是这三种动作不一定同时存在。便提高冲裁刃口寿命，正确选用和设计卸料装置，对冲裁件的质量是非常重要的。采用顶件器顶件，或是对于密集冲头的冲裁件，往往由于模具空间比较小，顶件力比较大，给模具设计带来一定难度，影响冲制件的质量。在某些情况下，如果卸料力加剧模具刃口磨损。采用氮气弹簧卸料或顶件，由于它的弹压力大，占据的模具空间很小，卸料力和顶件力又很容易达到均衡状态，因为卸料板或顶件板均可以同时均衡地与氮气弹簧接触，布受力，从而非常平稳地将工件顶出或将废料卸出，确保工件的平直性，减少冲头拆断和磨损的可能性，提高了冲头的寿命，模具设计也是非常简单，尤其是对于密集型冲头的冲压件，更显出它的优点。例如发动机气缸垫一类的零件，采用氮气弹簧能有效地解决，模具空间小与要求卸料力大小的矛盾。甚至可以将模座作为氮气弹簧的气室加以利用，减小氮气弹簧占有的空间。

中译英：
1 Flanging forming process
Flanging is the workpiece hole edge or rim in the mold under the action of vertical edges, flanging cold stamping process. According to the properties of the workpiece edge, flanging can be also divided into the hole and the outer edge flanging, including a round hole and a round hole flanging; convex curve and a concave curve flanging; flat and curved flanging process. When the edge of the workpiece to a straight line, flanging deformation becomes bending deformation, so is the special form of bending flanging. Thus, in a closed curve flanging, prevents the workpiece slip, is to ensure that the flanging quality the key, in the design of this kind of mold, to ensure the availability of larger initial pre stress is very necessary. The current conventional elastic element, the preload and the working stroke are difficult to meet the requirements, and the gas spring can easily meet the technological requirements, it has a sufficiently large stroke, with a large bomb pressure are available, without pretension, can achieve the requirements of the designer, which is very reliable and stable to ensure the dimensional accuracy of the work piece and the forming quality of the flanging. The cold stamping process, common flanging quality problems, due in large part to the workpiece pre pressing not caused, especially in automobile covering parts of flanging, more common. Nitrogen spring appeared to solve this problem. Open up a bright future.
Rolling forming is a kind of material stretching, the formation of local concave or convex, change the shape of blank of cold stamping process, it is mainly used to suppress stiffener, to improve the workpiece stiffness, reducing weight. For some with continuous convex rib parts, due to material extension rate limit, to a rib forming, using nitrogen gas spring can be in a mold, depending on the length of stroke, stepped forming, is very effective to solve this kind of problem, improve pressing productivity. To solve this kind of parts is the main problem can be well positioned, but also makes the parts obtained preform, completely eliminates the material during the forming process, mutual and diversionary effect, effectively ensure the material forming the order, ensuring the quality of parts.
2 Blanking discharging, the top piece and plastic
Blanking is the use of the die to make material is separated into two parts of the cold stamping process, the workpiece or waste from the convex die unloading referred to as unloading, the workpiece or waste material from the die blanking direction along the launch called push piece, against a blanking direction from the concave die ejector called top piece. This is in the blanking process is very common in action. But these three movements do not necessarily exist at the same time. It enhances the punching blade life, proper selection and design of unloading device, to guarantee the quality of blanking parts is very important. The ejector is top, or for intensive punch blanking, often due to the mold space is relatively small, the top piece is relatively large, mold design brings certain difficulty, affect the quality of parts. In some cases, if the unloading stress aggravates the die cutting edge wear. The nitrogen discharge or top, due to its elasticity and pressure big, occupy the mold space is very small, unloading and the top piece and easily reach the equilibrium state, because the stripper plate or top plate can be balanced with nitrogen gas spring contact, cloth force, thus ensuring very smoothly will workpiece ejecting or waste discharge, securing a workpiece straightness, reduce the breaking and the possibility of wear, prolonging the service life of a punch, die design is also very simple, especially for labor-intensive punch stamping parts, more show its advantages. For example engine cylinder pad type parts, using nitrogen gas spring can effectively solve, small space and requirement of mold unloading size paradox. Can even die seat as nitrogen spring chamber to use, reducing the occupying space of nitrogen spring.
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