特种工程胎硫化外胎质量缺陷原因分析以及解决措施

我公司使用的硫化机采用氮气定型,二次水硫化的工艺。由于特种工程胎胎体偏厚且大,成型机都比较大,生产过程中的帘布筒、钢丝、胎侧等部件都比较重且大。成型胎面使用胎面缠绕机缠绕,所以整个生产过程难度较大。特种工程胎硫化外胎的主要质量问题有:胎面皮泡、胎侧缺胶、胎侧泡、胎肩侧皮泡、子口内侧露线、子口缺胶、胎肚内缺(窝气)、胎肚露线、胎肚皮泡、胎肚串泡、子口支边、胎冠支边、子口鼓包、外胎花缺等。通过对特种工程胎硫化外胎质量缺陷原因分析,找到相应的解决措施,从而减少硫化外胎质量缺陷。     

改性防护蜡对轮胎胎侧胶性能的影响

研究改性防护蜡对轮胎胎侧胶性能的影响。结果表明,与传统防护蜡相比,改性防护蜡异构烷烃质量分数较小,结晶尺寸小且致密程度高。改性防护蜡可在不影响胎侧胶硫化特性和物理性能的前提下,大幅提高胎侧胶抗喷霜性能,保证轮胎表面不受臭氧侵蚀,在防止裂纹产生的同时明显改善成品轮胎外观。     

管电极电解铣削深窄槽流场研究

针对封闭深窄盲槽结构的加工难点,提出了一种管电极电解铣削加工工艺。通过仿真软件对电解铣削过程中的流场进行建模仿真,利用高速摄影仪观测流场分析该方法的可行性。采用外径0.8 mm的管电极在不锈钢上进行电解铣削加工深窄槽试验,研究电解液压强对深窄槽轮廓精度的影响规律,成功加工出槽宽(1±0.05)mm、槽深(2.5±0.05)mm的高精度、侧壁陡直的封闭深窄盲槽。     

Study on downward flame spread over extruded polystyrene foam in a vertical channel: Influence of opening area

Experimental methods and theoretical analysis are employed to investigate effects of channel opening area on downward flame spread characteristics of extruded polystyrene (XPS) thermal insulation materials on building facade. The average flame height first drops and then rises as dimensionless opening area (the ratio of sidewall opening area to sidewall area, ie, S^*) increases. As S^* rises, both the average and maximum temperature of the curtain wall decrease, and the decreasing of the average temperature is linear. XPS surface temperature history can be divided into four stages, ie, inapparent rising stage (preheating), significant rising stage (melting), dropping stage (pyrolysis), and rerising stage (ignition). The preheating length first rises and then drops as S^* increases. The XPS flame spreads steadily at the early period while acceleration occurs at the later period. For different opening areas, the difference in spread distance history is not apparent in the early stage while this difference is significant in the later stage. The flame spread rate (V_f) first increases and then decreases as S^* rises. A downward flame spread model for XPS in vertical channel with openings is built. The varied trend of V_f predicted using this model corresponds to the experimental result.     

粘合增进剂AIR-1在农业轮胎和工程机械轮胎中的应用简

介绍粘合增进剂AIR-1在农业轮胎和工程机械轮胎胎侧胶、缓冲层胶、帘布外层胶和帘布内层胶中的应用。结果表明:粘合增进剂AIR-1可以提高农业轮胎和工程机械轮胎胎侧胶、缓冲层胶、帘布外层胶和帘布内层胶的粘合强度、耐疲劳性能和耐屈挠性能,显著延长轮胎使用寿命,降低原材料成本。     

天津石化公司涤纶长丝装置纺丝楼暖通设计

介绍了工程概况及特点，并从空调送风系统、回风系统、水系统、蒸汽及凝水系统、供暖系统、排烟系统、自控系统、空调设备选型等方面介绍了涤纶长丝装置纺丝楼的暖通空调设计情况。工程已投入生产3年多，运行情况良好。     

胎圈增强胶片在轻型载重子午线轮胎中的应用

研究胎圈增强胶片在轻型载重子午线轮胎中的应用。结果表明:胎圈增强胶片可明显提升胎圈耐久性能;与胎体帘布贴合增强胶片相比,增强胶片与胎侧型胶复合挤出可以提高生产效率、降低生产成本,并进一步提高轮胎及其胎圈的耐久性能;与使用较低硬度和模量增强胶片的轮胎相比,使用较高硬度和模量增强胶片的轮胎及其胎圈耐久性能均更好。     

轮胎定型硫化机氮气硫化喷头角度设计与实验

轮胎氮气硫化工艺因节能效果显著而备受推崇,此项技术在国外已得到广泛应用。近年来,国内轮胎生产企业陆续投入资金进行轮胎氮气硫化工艺技术改造,逐渐淘汰传统、高能耗的过热水硫化工艺。本工作提出通过改变蒸汽进入轮胎型腔内部的喷射角度的设想,并进行试验验证,试图解决氮气硫化工艺轮胎上下胎侧温差大的问题。     

基于时空分布模型的混凝土面板堆石坝挤压边墙变形监测资料分析

基于挤压边墙多测点变形监测资料,通过引入监测点的空间坐标标量,结合场理论建立了挤压边墙变形时空分布模型。结合建设中的涔天河水库扩建工程挤压边墙的实测变形资料,验证了本文建立的挤压边墙变形时空分布模型。结果表明,该混凝土面板堆石坝挤压边墙的监测区域上部仍处于发展状态,尚不适合面板混凝土的施工。     

The effects of etching and deposition on the performance and stress evolution of open through silicon vias

The effects of silicon etching using the Bosch process and LPCVD oxide deposition on the performance of open TSVs are analyzed through simulation. Using an in-house process simulator, a structure is generated which contains scalloped sidewalls as a result of the Bosch etch process. During the LPCVD deposition step, oxide is expected to be thinner at the trench bottom when compared to the top; however, additional localized thinning is observed around each scallop. The scalloped structure is compared to a structure where the etching step is not performed, but rather a flat trench profile is assumed. Both structures are imported into a finite element tool in order to analyze the effects of processing on device performance. The scalloped structure is shown to have an increased resistance and capacitance when compared to the flat TSV. Additionally, the scalloped TSV does not perform as well at high frequencies, where the signal loss is shown to increase. However, the scallops allow the TSV to respond better to an applied stress. This is due to the scallops’ enhanced range of motion and displacement, meaning they can compensate for the stress along the entire sidewall and not only on the TSV top, as in the flat structure.