Optimal Design of a Main Driving Mechanism for Servo Punch Press Based on Performance Atlases

The servomotor drive turret punch press is attracting more attentions and being developed more intensively due to the advantages of high speed,high accuracy,high flexibility,high productivity,low noise,cleaning and energy saving.To effectively improve the performance and lower the cost,it is necessary to develop new mechanisms and establish corresponding optimal design method with uniform performance indices.A new patented main driving mechanism and a new optimal design method are proposed.In the optimal design,the performance indices,i.e.,the local motion/force transmission indices ITI,OTI,good transmission workspace good transmission workspace(GTW) and the global transmission indices GTIs are defined.The non-dimensional normalization method is used to get all feasible solutions in dimensional synthesis.Thereafter,the performance atlases,which can present all possible design solutions,are depicted.As a result,the feasible solution of the mechanism with good motion/force transmission performance is obtained.And the solution can be flexibly adjusted by designer according to the practical design requirements.The proposed mechanism is original,and the presented design method provides a feasible solution to the optimal design of the main driving mechanism for servo punch press.

Reduce the noise of punch press with the equivalent damping

To reduce the noise of the punch press during the punching process, the polyurethane elastomer is used as the damping material. The experiments of reducing noise were made by means of adding the polyurethane elastomer at different positions on the 100 kN and 1 000 kN punch presses. The better effect of reducing noise was obtained. After researching and analyzing a large number of test data, the ″equivalent damping hypothesis″ is put forward. The hypothesis makes the experiment of reducing noise simpler and also more economical. It is estimated that there is a vast application in the research area of vibration control and noise reduction.

Noise reduction of punch press mechanical clutch engagement

Among the noises of the punch press, blanking noise and engaging noise of the clutch should be paid most attention to. The latter is generated by the engagement impacts of the rotating key on the spline bush. In order to absorb the pressing energy and reduce the noise radiated, polyurethane cushions were added to the spline bush keyways and the clutch running noise reduction has reached 10.7 (dB(A)). Considering such factors as the running characteristics of the punch press clutch, the demand for cushioning performance and the demand of the clutch temperature field for damping materials, the temperature field of the rigid clutch spline bush was simulated to find out whether the temperature of polyurethane go beyond its critical application temperature, using the finite element method. According to the characteristic that the deforming memory alloy can restore the remembered shape with the temperature rising, the actual temperature of the spline bush was measured. Consequently, the theoretical temperature turned out to be close to the measured temperature.

Experimental Study on Noise Reduction of Punch Press

To reduce the noise of punch press during the punching process, the polyurethane elastomer is used as the damping material. The experiments of reducing noise were made by means of adding the polyurethane elastomer at different positions of 100 kN and 1 000 kN punch press. The better effect of reducing the noise was obtained. With the research and analysis of a large number of test data, the 'equivalent damping hypothesis' is put forward. The hypothesis makes the experiment of reducing noise be more simple and cost effective. This method would be exploited in area of vibration control and reducing noise.

Prediction of effects of punch shapes on tableting failure by using a multi-functional single-punch tablet press

We previously determined 'Tableting properties' by using a multi-functional single-punch tablet press(GTP-1). We proposed plotting 'Compactability' on the x-axis against'Manufacturability' on the y-axis to allow visual evaluation of 'Tableting properties'. Various types of tableting failure occur in commercial drug production and are influenced by the amount of lubricant used and the shape of the punch. We used the GTP-1 to measure'Tableting properties' with different amounts of lubricant and compared the results with those of tableting on a commercial rotary tableting machine. Tablets compressed with a small amount of lubricant showed bad 'Manufacturability', leading to sticking of powder on punches.We also tested various punch shapes. The GTP-1 correctly predicted the actual tableting results for all punch shapes. With punches that were more likely to cause tableting failure, our system predicted the effects of lubricant quantity in the tablet formulation and the occurrence of sticking in the rotary tableting machine.

Formulation design of granules prepared by wet granulation method using a multi-functional single-punch tablet press to avoid tableting failures

We previously determined "Tableting properties" by using a multi-functional single-punch tablet press(GTP-1). We plotted "Compactability" on the x-axis against "Manufacturability"on the y-axis to allow visual evaluation of "Tableting properties". Here, we examined whether this evaluation method can be used in the formulation design of tablets prepared by wet granulation. We used the GTP-1 to measure "Tableting properties" with different amounts of binder, disintegrant, and lubricant, and compared the results with those of tableting on a commercial rotary tableting machine. Tableting failures(capping and binding in particular) occurred when samples that had been evaluated as having poor "Compactability" or"Manufacturability" on the GTP-1 were compressed on the rotary tableting machine. Thus,our evaluation method predicted tableting failure at the commercial scale. The method will prove useful for scaling up production.

数控冲床取料装置的设计与应用

由于数控冲床的固定落料口位于冲锤和工作台下方,取出工件需停机并钻入工作台下或将工作台移开才能收集工件,不方便且有一定安全隐患,加之工作台经常移动,容易造成地面磨损,导致工作台面不平整,从而影响加工效果。为了解决这个问题,设计了具有废料和工件分离筛选功能的传送带装置,通过导板把材料从落料口移入输送带,再通过输送带把工件和废料传送到工作台外的分离装置上,从而能够实时收集工件,解决人工取件的不便,提高了教学的安全性。

厚料小孔冲孔模设计

通过分析某型号产品电镀挂架的材料及形状,介绍了其加工工艺性,从模具模架的选择、固定板的选用、冲孔凸模的结构设计与材料确定、卸料弹簧的布局等方面介绍了其冲孔模具设计,详细介绍了冲孔凸模的材料选择和结构设计。最终,解决了钻床手动钻孔效率低下、劳动强度高、钻头寿命低、孔口毛刺外翻等问题。

结构装配连接方式及其模具制作的研究

对常规和工字式或槽式的两种结构装配方式进行了对比研究。研究结果表明:工字式或槽式结构装配方式辅助连接件少,且制作其端口连接结构的冲压模具可在一个行程内完成压型、冲孔两道工序,能够在保证质量的基础上降低成本、提高效率、使设备模块化、模块标准化。无论从制作、安装、成本、管理、安全等角度考虑均为制作安装提供了一种可靠、简单的连接方式。

伺服冲床主传动机构构型及运动学优化设计

伺服冲床是一种高速高频高精的新型板材冲压机床,其主传动机构构型、尺寸、性能直接影响冲床的精度、效率、冲压力等主要工作性能参数。通过分析现有机构构型,对伺服冲床主传动机构进行构型设计,并分析两种不同类型的机构特点。总结目标函数法和性能图谱法两种优化方法的特点及适用情况,提出基于目标函数法的冲床主传动机构优化目标函数,并采用两种优化设计方法分别对两类主传动机构进行尺度综合,验证了不同类型机构的特点。该研究对伺服冲床主传动机构构型及优化设计提供了思路及方法。

Windows环境下转塔数控冲床监控与编程系统的设计

本文详细介绍了Ｗｉｎｄｏｗｓ环境下转塔式数控冲床监控与编程系统的总体结构设计。系统测试和运行结果表明，该系统达到了预期的设计目标。

冲床隔振基础双自由度力学模型的建立与解析

使用最优化理论进行了计算机辅助冲床基础隔振设计。建立了开式冲床有阻尼双自由度振动力学模型和隔振解析方案 ,以振动加速度为目标函数编制了隔振参数优化设计计算机程序 ,针对J2 3- 10冲床进行了实算。

PLC在冲床控制中几个关键技术的研究

指出PLC应用于冲床动作控制的必要性 ,明确了应用PLC对冲床实施控制时的几个关键技术问题并指出了相应的解决途径 ,从而成功地对JH23

高速转塔冲床专用数控系统的研究及开发

以实现高速转塔冲床加工功能为目标,研究了高速转塔冲床的高速性能及特殊加工功能,提出了在开放式华中高档数控系统平台进行高速转塔冲床数控系统的实现方法。对所开发的高速转塔冲床数控系统的试验测试结果表明,所开发的高速转塔冲床数控系统性能稳定可靠、各项技术指标达到进口数控系统的水平。

平面双曲柄冲压机刚柔耦合模型的动态仿真

采用机械动力学分析软件ADAMS和有限元分析软件ANSYS联合仿真的关键技术,建立平面双曲柄冲压机的多刚体及刚柔耦合的虚拟样机模型,对其进行仿真分析,比较了两者的仿真结果,可以得出刚柔耦合模型更能真实地反映机构的动态性能,提高计算精度,仿真结果表明柔性体对机构运动精度的影响不容忽视。刚柔耦合虚拟样机的建立为精确进行动力学仿真和实际物理样机的制造提供了基础。

基于Hypermesh和Workbench的伺服冲床主传动连杆结构优化设计

基于轻量化的产品设计准则及满足冲床高速高频的工作要求,采用Hypermesh软件对伺服冲床主传动机构的关键零件—连杆进行了拓扑结构优化及模态分析,并采用Workbench软件进行了尺寸优化设计,设计结果表明,结构优化后的连杆去除了不必要的材料,固有频率较优化前提高较大,模态满足设计要求,并且具有更高的强度和刚度,在快速冲压的工作环境下具有更佳的机械性能。结构优化对于缩短伺服冲床主传动的设计周期,降低产品成本,具有较好的工程应用价值。

数控压力机新型液压驱动系统

介绍了一种新型的数控压力机液压驱动系统,该系统采用快速开关阀作先导阀控制逻辑阀进行大流量快速切换控制,使液压缸高速往复运动,从而实现数控压力机滑块与模具的快速驱动。改进后的系统结构简单,成本低,其技术水平达到了国外同类产品的水平。

JH23-63型冲床的PLC控制

在简述冲床电气传统继电器——接触器控制方法存在问题的基础上，指出了对其进行 PLC控制的必要性。对 JH23－ 63型冲床新旧两种控制方案进行了全面深入的分析，并建立了 PLC硬件接线方案和梯形图。在实际中成功地完成了该冲床的 PLC控制。

氯化钾渗透泵型控释片剂释药规律及机制的研究

目的 研究渗透泵型控释片剂的释药规律及释药重现性 ,探索考察释药机制的新方法。方法 锅包衣方法制备渗透泵片。考察片心处方中的助悬剂、释药孔朝向、溶出仪转速、包衣膜厚度、包衣膜中PEG4 0 0用量、释药孔大小及片心硬度对释药的影响。测定一个释药孔制剂与两个释药孔制剂的药物释放度以考察释药机制。结果 释药孔朝向对不含助悬剂的制剂释药有明显影响 ,而对含助悬剂的制剂释药无影响。衣膜厚度增加 ,释药减慢 ,膜中PEG4 0 0含量增加 ,释药加快 ;而溶出仪转速、片剂释药孔大小及其片心硬度在一定范围内对释药没有显著影响。一个释药孔制剂与两个释药孔制剂的药物释放度基本一致。结论 在片心中加入助悬剂能显著提高制剂释药重现性。衣膜厚度、膜中PEG4 0 0含量是控制制剂释药速率的两大因素。

圆钢管约束灌浆料抗局部冲切承载力影响因素分析

基于圆钢管约束灌浆料抗局部冲切试验研究,分析了约束作用下灌浆料抗冲切承载力及破坏形态的影响因素及程度。主要考察因素有灌浆料强度、冲切角、弹簧环、圆钢管高度及壁厚等因素。结果表明,冲切角和钢管高径比对抗冲切承载力及破坏形态影响显著,弹簧环数量对提高承载力影响较小,通过分析为高强灌浆料的推广应用及承载力验算提供理论参考。