冲裁加工最大噪声声压级预测模型

根据冲头的结构特点，将其模化为等直杆，推导出了突然分离阶段时，冲头端面的自由振动方程；同时，结合相关的声学知识，得出预测突然分离阶段最大噪声声压级的数学模型；最后，通过实验验证了该模型的有效性。     

叠层金属薄板材料的冲裁特性研究

在冲裁分离过程中,单层与叠层金属板材存在很大的差异。通过对比2者的不同特点,选取并分析微元体的应力应变状态,发现在叠层冲裁过程中,变形区内中间层的材料处在3向压应力状态,表现出很强的可塑性。分析冲裁中各因素对应力状态的影响发现,合理地减小凸模与凹模的间隙可以提高变形区的静水压,抑制裂纹的产生,使冲裁过程控制在塑剪变形阶段。以叠层母线冲孔为例来验证理论分析,试验结果与分析一致,叠层冲裁比同厚度单层冲裁所要求的模具间隙更小,其值取在普通冲裁间隙经验公式的基础上乘以0．4左右的修正系数为宜。     

电动汽车点火外壳的成形模具设计

介绍了一种利用落料拉深复合模对08Al进行拉深,使其经过落料拉深以及4次单工序拉深等5个工步,最后将余料在车床上切除的成形模具设计。     

An integrated continuous-discontinuous approach towards damage engineering in sheet metal forming processes

This paper addresses the simulation of ductile damage and fracture in metal forming processes. A combined continuous-discontinuous approach has been used, which accounts for the interaction between macroscopic cracks and the surrounding softening material. Softening originates from the degradation processes taking place at a microscopic level, and is modelled using continuum damage mechanics concepts. To avoid pathological localisation and mesh dependence and to incorporate length scale effects due to microstructure evolution, the damage growth is driven by a non-local variable via a second order partial differential equation. The two governing equations, i.e. equilibrium and non-local averaging, are solved in an operator-split manner. This allows one to use a commercial finite element software to solve the equilibrium problem, including contact between the tools and work piece. The non-local averaging equation is solved on a fixed configuration, through a special purpose code which interacts with the commercial code. A remeshing strategy has been devised that allows: (i) to capture the localisation zone, (ii) prevent large element distortions and (iii) accommodate the crack propagation. To illustrate the capabilities of the modelling tool obtained by combining these continuum mechanics concepts and computational techniques, process simulations of blanking, fine-blanking and score forming are presented.     

Reduction of Blanking Noise by Controlling Press Motion

To reduce blanking noise with servo controlled presses, continuous two steps blanking, In which the punch is stopped at an Intermediate position before breakthrough and soon moved again to finish the process, is proposed. Plates of carbon steels, 18-8 stainless steel, titanium and copper are tested. When the punch is stopped just before breakthrough, the noise can be reduced to a very low level especially for high strength carbon steel plates. The mechanism of noise reduction in the process is clarified through the measurement of sound wave and machine vibration together with short-time FFT analysis.     

磨损系数的含义及合理确定

讨论了冲裁模刃口尺寸计算公式中磨损系数的含义，给出了其合理确定方法。     

一种高速精密数控冲床滑块动态精度测量方法

提出一种高速精密数控冲床滑块动态精度测量分析思路,对实际中滑块动态精度测量具有较强的指导意义。     

支撑板精冲成形工艺分析及模具设计

分析了保护盖成形的工艺特点，并设计了一副氮气弹簧式精冲模，对模具材料的选择和热处理进行了分析。并指出了该副模具的设计要点。     

Modelling and experimental analysis of the effects of tool wear on form errors in stainless steel blanking

The main defects that characterize the quality and accuracy of blanked parts are the form errors which can be found on the blanked surface. These defects are basically related to tool wear and process parameters. This work presents theoretical modelling of the effects of tool wear on the shearing mechanism and resulting form errors. To this end, a new parameter denominated effective clearance, which characterizes the distance between a punch and the die cutting edge when a tool is worn, is defined. An experimental analysis of form errors as a function of this new parameter is made, using 6 and 8 mm AISI A2 steel punches and 1 mm thick AISI 304 stainless steel sheet. Finally, design criteria are proposed for the process parameters to fulfil the quality requirements of blanked parts.     

冲截模CAD系统中的工艺性分析

详细论述了作者所研究开发的冲截模ＣＡＤ系统工艺性分析的基本内容，介绍了各类工艺性判别，检查了类型模型的建立，程序流程及技术要点。