共查询到20条相似文献,搜索用时 187 毫秒
1.
2.
本文针对护罩冲压件的结构特点和生产要求,介绍了护罩冲压件冲压成形工艺和成形要点。分析了护罩冲压件在成形过程中容易出现的一些问题,提出了增加近似成形料包的工艺设计方法和底部小圆凸台采用反拉深的工艺方法,解决了护罩冲压件成形的难点问题。应用结果表明,该冲压成形过程和成形工艺设计方法是非常有效而可靠,对其他类似产品的成形工艺具有一定的启发与参考作用。 相似文献
3.
为提高活塞式无扰动涂层工艺的涂层质量,针对高分辨率激光快速成形系统涂层工艺中存在的涂层厚度随制件高度增加而变厚的问题,提出在制作过程中动态优化刮刀速度的涂层方法。研究刮刀速度、制件高度对涂层厚度的影响。采用面响应法,建立涂层厚度误差关于制件高度及刮刀速度的数学模型。根据该模型,在制作过程中随制件高度的变化,动态优化刮刀速度,实现涂层厚度均匀化。验证试验结果表明:与普通涂层工艺相比,新型涂层工艺将涂层厚度偏差由27 μm降为6.9 μm,解决了涂层厚度随制件高度增加而变厚的问题,实现涂层厚度的均匀化,提高堆积方向的制作精度。该涂层工艺也可应用于普通光固化激光快速成形系统中,解决制作陷阱结构时涂层厚度随制件高度变厚问题,因此该工艺对于光固化快速成形技术中提高堆积方向制作精度具有重要意义。 相似文献
4.
5.
6.
7.
8.
气压式熔融沉积造型系统工艺参数研究 总被引:1,自引:0,他引:1
气压式熔融沉积快速成形系统是采用基于BPM技术的FDM工艺原理开发的。文章详细介绍了系统的基本结构、各项加工工艺及其参数对成形精度的影响,并通过工艺实验验证了从理论角度分析得出的各项参数之间的关系。在模具制造过程中,精度控制较好,工艺稳定,成形材料选择范围广泛,不仅可以完成传统FDM的快速设计任务,还可以完成金属成形、工程零件的快速设计等用途。适应了当前模具行业敏捷、高效率、高精度的趋势。 相似文献
9.
应用田口方法的信噪比(SN)对液面曝光辐照度、曝光时间、液面等待时间及面收缩补偿系数4个主要影响面曝光快速成形的因素进行了优化试验研究。采用自由度为26的L27(313)形式的正交表,通过实验得到各个因素不同水平对应的制作零件尺寸误差的信噪比。实验结果的直观分析和方差分析表明:面收缩补偿系数、液面曝光辐照度、面收缩补偿系数与液面曝光辐照度的交互作用及液面等待时间对制作精度有显著影响;面收缩补偿系数与液面等待时间之间的交互作用对制作精度有一定的影响。针对面曝光快速成形系统,得出了以曝光平面内的制作精度为优化目标的制作参数的最佳组合。试验结果表明:在最佳的制作工艺参数条件下,曝光平面内的制作误差在±10μm范围内,显著提高了面曝光快速成形制作精度。 相似文献
10.
分析了开发经济型桌面化快速成形系统的可行性与现实意义,提出了系统应采用基于喷射技术的快速成形工艺,研究了系统的技术特性和结构,完成了系统设计,并描述了典型的设计实例。研究表明该类系统很好地满足了高度个性化成形、高度工艺柔性的使用要求。 相似文献
11.
Peng Zhao Huamin Zhou Yong He Kan Cai Jianzhong Fu 《The International Journal of Advanced Manufacturing Technology》2014,72(5-8):765-777
Nondestructive online monitoring of injection molding processes is of great importance. However, almost all prior research has focused on monitoring polymers in molds and damaging the molds. Injection molding machines are the most important type of equipment for producing polymeric products, and abundant information about actual polymer processing conditions can be obtained from data collected from operating machines. In this paper, we propose a nondestructive online method for monitoring injection molding processes by collecting and analyzing signals from injection molding machines. Electrical sensors installed in the injection molding machine, not in the mold, are used to collect physical signals. A multimedia timer technique and a multithread method are adopted for real-time large-capacity data collection. An algorithm automatically identifies the different stages of the molding process for signal analysis. Moreover, ultrasonic monitoring technology is integrated to measure the cavity pressures. Experimental results show that our nondestructive method can continuously monitor the injection molding process in real time and automatically identify the different stages of the molding process. The packing parameters, including the filling-to-packing switchover point and the packing time, can be optimized based on these data. Furthermore, the ultrasonic reflection coefficient and the actual cavity pressure have similar trends, and our technique for measuring the cavity pressure is accurate and effective. 相似文献
12.
Davide Masato Maksims Babenko Banah Shriky Tim Gough Giovanni Lucchetta Ben Whiteside 《The International Journal of Advanced Manufacturing Technology》2018,99(1-4):113-125
Ultrasound injection molding has emerged as an alternative production route for the manufacturing of micro-scale polymeric components, where it offers significant benefits over the conventional micro-injection molding process. In this work, the effects of ultrasound melting on the mechanical and morphological properties of micro-polypropylene parts were characterized. The ultrasound injection molding process was experimentally compared to the conventional micro-injection molding process using a novel mold, which allows mounting on both machines and visualization of the melt flow for both molding processes. Direct measurements of the flow front speed and temperature distributions were performed using both conventional and thermal high-speed imaging techniques. The manufacturing of micro-tensile specimens allowed the comparison of the mechanical properties of the parts obtained with the different processes. The results indicated that the ultrasound injection molding process could be an efficient alternative to the conventional process. 相似文献
13.
Chin-Huang Sun Juhn-Horng Chen Long-Jye Sheu 《The International Journal of Advanced Manufacturing Technology》2010,48(1-4):63-70
This study presents an exponentially weighted moving average predictor and minimum–variance controller for the quality control of plastic injection molding processes. This is a slow drifting problem of quality control during plastic injection molding processes. In order to have good product quality for plastic injection molding process, a proposed approach was applied to achieve the desired process control quality during the control process. To simplify the process model and reduce system loads, design of experiments technique was adopted to analyze the important factors that had significant effects on the product quality and their relative correlations. The results of this research showed that the proposed approach was effective for a quality control of plastic injection molding process. This cannot only steadily control the manufacturing process to reduce product loss and maintenance time due to unforeseen malfunctions, but they can also increase the efficiency of the equipment and the process. 相似文献
14.
15.
16.
17.
18.
针对基于浅层学习模型的过程监控方法难以对大数据制造过程运行状态进行实时智能监控的问题,提出了基于深度置信网络的大数据制造过程实时智能监控方法。利用灰度图建立大数据制造过程质量图谱,以精准表达其过程的运行状态;构建用于识别大数据制造过程质量图谱的深度置信网络;应用离线训练好的深度置信网络模型对当前监控窗口内的过程质量图谱进行识别,实现大数据制造过程实时智能监控。最后,应用该方法对某注塑件大数据制造过程进行实时质量智能监控,结果表明:所提方法的识别性能明显优于基于主成分分析与BP神经网络、支持向量机的识别模型,能有效应用于大数据制造过程实时质量智能监控。 相似文献
19.