汽车加油口双色注射模设计

分析了汽车加油口塑件结构,确定了注射成型方案、进胶方式,并介绍了通过滑块与开模动作配合实现塑件脱模的过程。     

Design of delayed reconfigurable manufacturing system based on part family grouping and machine selection

To improve the convertibility of reconfigurable manufacturing system (RMS), the concept of delayed reconfigurable manufacturing system (D-RMS) was proposed. RMS and D-RMS are both constructed around part family. However, D-RMS may suffer from ultra-long system problem with unacceptable idle machines using generic RMS part families. Besides, considering the complex basic system structure of D-RMS, machine selection of D-RMS should be addressed, including dedicated machine, flexible machine, and reconfigurable machine. Therefore, a system design method for D-RMS based on part family grouping and machine selection is proposed. Firstly, a part family grouping method is proposed for D-RMS that groups the parts with more former common operations into the same part family. The concept of longest relative position common operation subsequence (LPCS) is proposed. The similarity coefficient among the parts is calculated based on LPCS. The reciprocal value of the operation position of LPCS is adopted as the characteristic value. The average linkage clustering (ALC) algorithm is used to cluster the parts. Secondly, a machine selection method is proposed to complete the system design of D-RMS, including machine selection rules and the dividing point decision model. Finally, a case study is given to implement and verify the proposed system design method for D-RMS. The results show that the proposed system design method is effective, which can group parts with more former common operations into the same part family and select appropriate machine types.     

核电厂电气设备陶瓷部件受风生飞射物的冲击破坏

为研究沿海台风中的风生飞射物对核电厂电气设备的冲击破坏，以核电厂户外高压电气设备的陶瓷绝缘材料为研究对象，基于LS-DYNA和HyperMesh，分析陶瓷部件在小球和钢管打击下的破坏情况。结果表明：在受到钢管垂直打击时，陶瓷部件很容易发生破坏；在受到小球冲击时，陶瓷部件局部表面发生破坏。进一步计算得到小球对陶瓷部件的临界破坏冲击速度，可为后续设计和研究提供参考。     

基于网格曲面形状修改的柔性件装配偏差分析

柔性件装配偏差有限元分析方法中的敏感度矩阵来源于产品的理论数学模型，而理论数学模型与实际模型之间存在一定的外形差异，会产生很大的分析误差。针对该问题，提出了一种装配偏差分析的改进方法，即根据产品理论外形和误差源数据，运用网格曲面变形方法获取逼近零件实际形状的数学模型，代替理论数学模型进行装配偏差分析。开展了金属薄板的装配回弹试验以及飞机壁板件的装配偏差分析计算，使用仿真、试验及测量等手段获取了各类偏差分析结果，并进行比较。数据表明，装配偏差分析误差可减小到5%以内。     

A mechanism informed neural network for predicting machining deformation of annular parts

Controlling machining deformation of annular parts is crucial for ensuring the performance of high value products and equipment. For example, during manufacturing of critical parts in aircrafts and spacecrafts, accurate prediction of machining deformation is the basis for guiding the formulation of deformation control strategies. However, due to the complexity of the machining deformation of annular parts, existing methods still have limitations in accurate prediction. To this end, this paper proposes a mechanism informed neural network (MINN) to predict machining deformation of annular parts. MINN is realized by establishing the dual sub-networks structure and using enhanced loss functions with the consideration of the deformation mechanism model characteristics of annular parts. The deformation was decomposed into the axisymmetric portion and the non-axisymmetric portion according to the deformation superposition principle, and modeled separately based on the thin-shell theory and Fourier series. Experiment results showed that the proposed method could predict the machining deformation of annular parts more accurately and stably with a small amount of training data, compared with previous methods.     

汽车锁零部件碱性锌镍合金电镀工艺

介绍了汽车锁零部件碱性挂镀锌镍合金电镀生产线的开发过程,包括前期市场调研、中期小槽试验、后期成本核算、电镀工艺流程确定、废水处理工艺制定以及阳极膜应用可行性分析。     

镍基高温合金锥筒形件拉深旋压成形机理研究

针对镍基高温合金因加工硬化严重成形时极易产生破裂和起皱等典型缺陷的问题,以锥筒形壳体类零件为对象,提出了一种由锥形预制坯经过真空固溶处理后拉深旋压成形锥筒形件的方法,并对其成形机理进行了研究。基于Abaqus/Explicit平台,建立了锥筒形件拉深旋压有限元模型,分析了成形过程中的瞬态等效应力、等效塑性应变、切向应力、壁厚及三向应变分布规律。结果表明:在旋压成形过程中,最大瞬态等效应力位于旋轮接触区及附近区域、最大瞬态等效塑性应变位于坯料口部;瞬态切向压应力最大值位于旋轮接触区,而瞬态切向拉应力最大值位于旋轮接触区附近的两侧区域。筒形段中部壁厚减薄,而坯料口部壁厚增厚。旋压成形试验表明,锥形预制坯经拉深旋压后可获得壁厚均匀的锥筒形件。     

基于PLC的胶带输送机保护系统研究

为了解决煤矿胶带输送机胶带在运行过程中出现的纵向撕裂的问题,采用PLC控制系统,研究了胶带输送机保护系统,分析了PLC系统特点,对系统的硬件部分的技术参数和设计要求进行了设计,对监测系统PLC进行了选型,采用S7-200 CPU226CN控制器,分析了语言报警系统,然后对PLC控制系统软件进行了设计。研究对促进我国胶带输送机保护技术的发展具有重要的意义。     

汽车雨挡导流片浮顶式侧抽芯机构注射模设计

介绍了一款汽车雨挡导流片异型塑件两板注射模的结构设计,该模具基于采用常规的滑块抽芯机构及斜顶机构难以实现塑件完全脱模的机构设计困难问题,突破常规设计思路,设计了一种型芯浮顶式侧抽芯机构来实现塑件的自动化注射生产。机构中,在模具开模打开后,通过顶出板及顶杆将塑件和部分成型一同顶出,而后再通过侧边二次顶出机构将塑件从局部型芯上顶出而实现塑件的完全脱模,有效地简化了模具结构设计,降低了模具的加工制造难度,降低了模具的制造成本,模具结构复杂新颖,工作稳定可靠,为异型类塑件的模具结构及机构设计创新设计提供了一个较好的案例借鉴。     

Effect of Ti content on the microstructure and mechanical properties of laser clad Ti/B4C/dr40-based composite coatings on shaft parts surface

As a transmission part, the service life of the shaft parts directly affects the machining efficiency and economic benefit, and requires higher surface hardness and wear resistance. In this study, the Ti/B₄C/dr40 composite powder was cladded on the shaft part surface via laser cladding to improve the microhardness and wear resistance. The microstructure evolution and phase structure were analyzed to reveal the strengthening mechanism of Ti and B₄C on dr40 coating. The Ti/B₄C/dr40 composite coating with low defects and good interface metallurgical bonding quality between coating and substrate was prepared on the 45# steel shaft part. The results show that the main phase in the Ti/B₄C/dr40 composite coating is TiC, TiB₂, Cr₂C₃, (Ti, Cr) C, (Ti, Cr, Fe, Ni) (C, B). With the addition content of Ti increasing, the grain densifies, the sieve-reticular structure and small strip phase at grain boundary and intergranular area change as massive phase. Moreover, the microhardness improves up to 2.05 times than that of dr40 coating. The in-situ synthesis of carbides and borides are evenly distributed in the coating, which improves the deformation resistance of the coating. In addition, the precipitation and solid solution strengthening caused by reinforcement phase also enhanced matrix strength for supporting reinforcement phases, improving the coating wear resistance.