钢质散热器两次成形时的厚向变形

通过模拟实验，研究了钢质板式采暖散热器两次成形的新工艺，讨论了在该工艺中每次成形时金属的变形规律，以及钢板在冲压成形过程中各工艺参数对厚向变形的影响，实验分析可知，两次成形新工艺可以使散热器最终的变形分布更为均匀，并可降低应变峰值，同时也提出了减小钢质散热器成形时厚向变形应采取的措施。     

铝合金板式散热器真空钎焊的影响因素分析

介绍了铝合金板式散热器的真空钎焊工艺;系统地分析了材料成分、包覆层厚度、表面预处理、封条形状、表面粗糙度、散热器装配、真空钎焊温度、保温时间、真空度、氩弧焊接、环境等因素对散热器焊接质量的影响;提出了相应的工艺措施,并在工程实践中取得了良好效果.     

柔性冲压成形复合模

文章分析了压力开关膜片这类冲压件的冲压成形工艺,对柔性冲压成形复合模的结构设计和工作原理进行了介绍。     

板式散热器的性能检测及恢复装置

文章主要介绍了SHP-3200型强磁选机的主要附属设备-BR20型板式散热器之性能检测,恢复装置的设计及使用原理.     

润滑条件对汽车零件冲压成形的影响

用３种润滑条件进行了一种汽车零件的冲压，对零件盛开有后的应变进行分析，比较了３种润滑条件下的成形效果。并对无润滑条件下的优化选材进行预测，认为该零件可以实行无润滑冲压。     

水冷散热器取代风冷散热器的探讨

在装载机运行过程中 ,工作油温过高是造成故障高的主要原因。为了有效地控制工作油温 ,可采用水冷散热器替代原风冷散热器 ,并调整其安装位置的方法。实践证明 ,该方法行之有效     

冲压成形网格分析系统数据拼接方法

车身冲压覆盖件面积大、形状复杂,一般采用Argus网格照相测量系统对其成形性和成形安全裕度进行评价.针对现有测量系统无法识别拉延和后序整形后网格,以及测量结果失真等情况,提出了按弧长方式测量和计算网格应变及变薄率的方法,创新性地将网格应变测量系统外的补测数据拼接到测量系统主体,通过Excel表与测量系统的主应变、FLC...     

铍板材深冲压成形异形件探讨

冲压成形是金属板材加工异形件的最基本方式。金属材质不同,冲压成形异形件的难易程度不同,主要影响因素是冲压成形性能和冲压成形极限。文章结合铍板材的冲压成形性能和冲压成形极限,对铍板材冲压成形异形件的难易性作了探讨。     

HP295热轧板冲压开裂原因分析

通过对梅山HP295热轧板生产焊瓶过程中冲压开裂件进行试验分析，找出梅山HP295冲压开裂的原因，并提出提高HP295产品质量建议。     

热成型钢及热成型技术

对热成型钢的成分设计、热成型工艺过程以及表面氧化的处理进行了论述。热成型工艺可以通过直接热成型或者间接热成型实现;热成型钢都是含硼钢,硼能抑制成型过程中铁素体形核;通过锰、铬和钼等提高淬透性防止珠光体形成;一般热成型钢中含有0.2%左右的碳。热成型钢可通过喷丸的方法消除表面氧化层或者镀层技术保护其表面不受氧化。     

热挤压生产紫铜电脑散热片实验分析

以紫铜电脑散热片产品为研究对象，通过对平模、锥模、前置保护分流模和替代式保护分流模等4种不同类型的模具进行结构和参数优化设计，利用热挤压一次成型的方法来进行紫锕电脑散热片实验，并用XL-30扫描电镜观察前置式保护分流模焊合室和铜型材焊合部位微观组织形貌。挤压结果表明：平模、锥模和前置保护分流模成型质量较好，而替代式保护分流模挤压失败；紫铜焊合处没看到明显的焊缝，在焊合区得到较为致密的组织，与基体组织无明显差别；焊合状况较好；热挤压一次成型法生产紫铜型材是可行的。     

双线性应变路径下St14-T冷轧薄板成形极限研究

在多轴加载试验机上开展了St14-T冷轧薄板单拉和双拉预变形试验，在此基础上采用CAMSYS自动网络分析仪测量了板料的极限应变，分析了预变形对板料成形极限的影响，试验结果表明：加载应变路径的变化会蚊蝇乱形极限曲线的高低。单拉预应变路径将显著提高正应变比区的成形极限，而对负应变比区的成形极限影响不大。等双拉预应变将明显降低正应变比区的成形极限，对负应变比区的成形极限有所提高，随着等双拉预应变量的增加，整条成形极限曲线将降低。     

Faster to Sound Parts by Advanced Forming Process Simulation ‐ Advanced Forming Process Model Including the Elastic Effects of the Forming Press and Tool

This article addresses process, stamping, and manufacturing engineers, as well as tool designers (prototype and series production tools), and press shop planners in the range of metal forming. The paper deals with methods of modelling and simulating the metal forming process and their application in product design, production, and forming process planning. In models usually applied major effects on the forming process are neglected. For instance, the elastic behaviour of presses and die tools is not considered in process and tool planning. Thus, reworking of tools is a consequence of this model oversimplification. The paper illustrates how interactions between forming press, die tool and metal forming processes can be modelled by enhancing conventional FE models. Several examples demonstrate the information value of the Advanced Forming Process Model (AFPM).     

Simulation of the Process Influencing Behaviour of Forming Machines

In the design of sheet metal components and associated tools the use of forming process simulation based on finite element method is state of the art. The modelling of the forming process, however, neglects fundamental influences of the forming machine. But today, the machine behaviour influencing the process can be described with simulation tools sufficiently. The article presented here describes the current state of simulation for forming machines in regard to static and dynamic influences on the forming process. Furthermore, two examples and a proposal for enhancing the model are given.     

Investigation of Elongation at Fracture in a High Speed Sheet Metal Forming Process

This paper investigates the dynamic elongation at fracture of conventional steels, advanced high strength steels and nonferrous metals, such as aluminium and magnesium alloys. Dynamic tensile tests were carried out using a high speed material testing machine at various strain rates ranging from 0.001/s to 200/s. The results show that the elongation at fracture of sheet metals does not simply decrease with the increase of the strain rate. The elongation of SPCC, SPRC450R, TRIP600 and AZ31 decreases when the tests are carried out under the quasi‐static state at the strain rate of 0.1/s, but increases again when the tests are carried out at the strain rate of 0.1/s up to the strain rate of 200/s. Furthermore, DP600 and AA7003‐T7 show the tendency that the tensile elongation increases as the strain rate increases. This tendency is related to the microstructure and forming history of the sheet metal. It is concluded that localized strain rate hardening in the necking region induces the enlargement of the necking region and thus the increased elongation. This phenomenon is worth being considered to predict the fracture of sheet metal products in high speed sheet metal forming.     

喷射沉积过程的计算模型

模拟了喷射沉积过程中的雾化过程;描述了熔滴在飞行中的动力学过程及凝固的热力学过程;建立了熔滴速度、温度、固相分数等参数与熔体过热度、气流速度之间的计算模型;通过对810℃的液态合金的数值计算,讨论了部分独立参数对该过程的影响.     

喷射成形CuCr25合金触头材料的制备及致密化处理

利用喷射成形技术制备了CuCr2 5合金触头材料 ,研究了雾化压力对显微组织、致密度和收得率的影响 ,对制得的沉积坯件进行了热锻压和热等静压致密化处理 ,并测试了触头材料的密度、硬度和电导率。研究结果表明 :最合适的雾化压力为 0 .6MPa ,沉积坯件经过 95 0℃锻压后再在 10 70℃ ,2 0 0MPa下热等静压 8h ,可以得到全致密的触头材料 ,铬颗粒平均直径小于 10 μm ,硬度达 10 0HB ,电导率 2 5～2 9Ms·m- 1 ,说明致密化处理后的喷射成形CuCr2 5合金是一种优良的触头材料。