PLC和触摸屏在服装熨烫中的应用

由于PC的出现改变了工业控制设计者的设计思想，随着科学技术的发展，服装工业正在变革，而这所有的变革主要集于服装机械的不断革新，它是现代服装工业发展的基础所在。可编程控制器（PLC）和触摸屏（PT）在自动化控制中应用越来越广泛。可编程控制器（PLC）的使用可对提高控制系统的可靠性控制精度。增强系统的抗干扰能力等起到重要作用。而触摸屏的使用则为整个控制系统提供了良好的人机操作界面．因此二者的有机结合越来越广泛的应用于工业生产的各个领域。     

正向充液变薄拉深工艺的研究

提出了一种称为正向充液变薄拉深的工艺方法。从理论上推导出变薄成形传力区拉应力计算式，并采用软铝车削毛坯进行了正向充液变薄拉深试验。当液压达到了１２０ＭＰａ时，车削铝毛坯的极限变薄拉深系数由０．５减小到０．３，说明正向充液变薄拉深工艺能有效地提高一次变薄拉深成形极限。     

激光头金属座多工位级进模设计

激光头金属座具有外形尺寸小、具有多处弯脚、精度要求非常高等特点,本文根据这些特点,介绍了激光头金属座多工位级进冲模的设计过程,着重讲述了其排样设计过程和其中的多次弯曲、整形工位,及其相应的凸凹模结构和模具的整体结构。为保证模具的互换性和精度,采用快换凸模,在弯曲成形时采用对称弯曲法平衡弯曲力。     

变薄拉深过程的数值模拟

利用上限元法对变薄拉深过程进行了数值模拟。在考虑加工硬化的基础上分析了凹模、芯轴与制件之间的摩擦因子以及变形比对变薄拉深工艺过程的影响。     

A Novel Ironing Process with Extra High Thickness Reduction: Constrained Ironing

A new ironing method entitled constrained ironing is proposed for producing thin-walled cans and components with uniform thickness. This method based on compressive stresses could reach a higher ironing limit ratio or thickness reduction ratio (TRR) without interruption for additional processing such as multi-stage ironing and annealing between different stages. When the constrained ironing starts, the punch pushes the constrained material to reduce the thickness from the outer surface of the cup. The state of the stresses is fully compressive in this new process while it is tensile in the conventional ironing method. The results showed that after constrained ironing process, the tensile strength and hardness increased to 204 MPa and 85 HV, respectively, from the initial values of 71 MPa and 25 HV. Thus, very high TRR is achievable in the constrained ironing process. Obtaining a higher TRR about 80% after only single stage ironing, removing the annealing stages, and obtaining higher strength and hardness of the ironed cup are several advantages of the proposed method. This novel and simple process could be very promising for the industrial applications to replace the conventional process and to reduce the final product cost.     

Evaluation of stamping lubricants at various temperature levels using the ironing test

Lubricants are employed in stamping operations in order to (a) improve the material flow into the die cavity, (b) reduce wear and galling in the die and (c) obtain good surface finish of the part. Process conditions such as high temperatures and pressures could cause the lubricant to fail, thus resulting in galling or tearing of the part, damage to the tooling, and lost production. Therefore, selection of an appropriate lubricant based on the process conditions is important in the stamping industry. Several benchmark tests emulating stamping operations have been developed and are used to evaluate the performance of candidate lubricants. The major drawback of most of these tests is their inability to emulate high contact pressures and sliding velocities, which are crucial parameters for lubricity, especially in the case of high-speed progressive or transfer die operations involving ironing. Moreover, most of these tests are conducted at room temperature, while in reality; the process temperature can reach as high as 200 °C. The ironing tribotest developed at the Engineering Research Center for Net Shape Manufacturing (ERC/NSM) induces high contact pressures and temperatures, thus emulating the conditions in a production environment. Application of the test to screen candidate lubricants for stamping operations involving the ironing process is discussed in this paper.     

Hydroironing: A Novel Ironing Method with a Higher Thickness Reduction

A new ironing method entitled hydroironing is proposed for producing cup shaped components especially those with lower formability to overcome the problem of low ironing limit ratio in the conventional ironing process. Lower ironing limit ratio in conventional ironing process increases the number of ironing stages and also manufacturing time and expenses. In this new method, unlike the conventional ironing process, forming punch is pushed to reduce the thickness from the inner surface of the cup starting from the cup edge while at the same time applying hydrostatic pressure onto the inner surface of the cup. The tools required for the proposed method were designed and manufactured and hydroironing tests were carried out. The results showed that a higher thickness reduction of about 70% was achieved only after a single hydroironing stage. The proposed hydroironing operation compared with the previous methods was observed to have three important advantages including higher thickness reduction, lower fluid pressure, and higher strength of ironed cup. This new process could be very promising for future industrial applications to reduce the product cost.     

毛皮熨烫机熨烫辊温度场的研究

以熨烫机实际结构及工作状况为基础,应用传热学理论,建立了毛皮熨烫机熨烫辊部件的热传导模型,用有限元法对其三维热传导温度场分布进行了分析。并对熨烫辊部件各点实测温度值与理论值作了对照比较。     

熨平辊装置的气动控制回路设计

本文介绍了铝带冷轧机、箔轧机、合卷机等设备的熨平辊装置的气动控制回路设计的优点。