全钢载重子午线轮胎活络模具花纹块缺陷原因分析及解决措施

全钢载重子午线轮胎活络模具花纹块缺陷会导致轮胎不易正常脱模,影响成品轮胎外观质量,同时缩短活络模具的使用寿命。从花纹块模具设计、加工工艺和维护保养方面分析活络模具花纹块缺陷产生的原因,并提出相应的解决措施,以降低车辆行驶过程中的安全风险。     

精铸球墨铸铁花纹块机械加工工艺分析

子午线轮胎活络模具（简称活络模具）分为壳体和型腔两部分，型腔由花纹块和上、下侧模组成。花纹块是活络模具的核心部件，主要采用精密铸造铝合金技术加工而成。随着子午线轮胎工业的不断发展，轮胎厂对活络模具的要求不仅在数量上逐步增加，质量上逐步提高，而且活络模具的使用寿命也越来越被人们所关注。精铸球墨铸铁花纹块的开发研制成功，填补了国内空白，成为活络模具行业新的经济增长点。１．铸件特点精铸球墨铸铁花纹块与精铸铝合金花纹块在铸造工艺和机械加工上截然不同。精铸球墨铸铁花纹块是采用单块铸造工艺，通过机械加工后组…     

全钢子午线轮胎活络模具的传热模拟分析

以12.00R20全钢载重子午线轮胎活络模具为例,利用有限元模拟软件分析模具的传热过程,并根据模拟结果优化模具结构设计。弓形座结构改进后,花纹块的上下温差由1.2℃降为0.9℃,使花纹块的温度分布更趋于均匀,有利于轮胎硫化质量的提高。     

AUTOCAD三维建模在活络模铝花纹圈钢片设计中的应用

<正>子午线轮胎活络模具是子午线轮胎生产中最后一道工序——硫化用的模具。在汽车工业飞速发展的今天,子午线轮胎的需求量越来越大,质量要求也越来越高,相应的对子午线轮胎模具的质量要求和复杂程度也越来越高。而作为轮胎模具花纹上     

3D扫描技术在轮胎模具检测中的应用

针对轮胎活络模花纹块表面复杂的几何设计,传统手段已经无法满足轮胎模具的检测要求。采用手持式激光扫描仪获取活络块成型表面的点云数据,在Geomagic Qualify软件中对点云数据进行有效处理,通过测量和比对分析判断活络块模具的变形和磨损程度,从而达到模具检测的目的。本工作可为解决轮胎模具检测难题提供有效的参考。     

子午线轮胎外观质量问题及解决办法

阐述了子午线轮胎外观容易出现的各种质量问题,从模具及硫化机方面分析了产生这些质量问题的各种原因及解决办法。指出圆锥面导向活络模具的型腔部分的花纹块、上侧模、下侧模及钢圈直接影响到轮胎的各项性能及外观质量。     

一种轮胎活络模具花纹块通用组装装置

正由山东豪迈机械科技股份有限公司申请的专利(公开号CN 105171986B,公开日期2018-01-09)"一种轮胎活络模具花纹块通用组装装置",涉及的轮胎活络模具花纹块通用组装装置,属于模具技术领域。该装置包括用于固定花纹块的模壳,模壳与花纹块之间设有若干块衬板,衬板可拆卸安装于模壳的内表面,衬板的内表面与花纹块的外表面相适配。本发明通用性强,能够满足多种规格结构花纹块的连接、紧固、定位及多种项目检测等功能,节省了投入成本,广泛应用于轮     

圆锥式活络模硫化时出现问题的处理

圆锥面导向活络模具是硫化子午线轮胎的主要设备之一,其型腔的质量直接影响着子午线轮胎的外观质量。 硫化时出现问题主要是轮胎胶边及胎侧出现台阶现象。胶边分5种类型:1.花纹块接触面(立面)之间及上、下侧模花纹块配合处(周边)均出现胶边;2.只花纹块接触面(立面)之间出现胶边;3.上、下侧模与花纹块配合处(下、下周边)均有胶边;4.上侧模与花纹块配合处(上周边)出现胶边;5.下侧模与花纹块配合处(下周边)出现胶边。上述各种问题主要是由模具制造误差、装配不当等几方面原因造成的。     

全钢子午线轮胎活络模具传热性能分析

根据实际温模载荷,利用有限元分析软件对9. 00R20和12. 00R20全钢子午线轮胎活络模具进行传热模拟分析。结果表明:原模具花纹块表面上侧温度比下侧温度高,最高温度出现在花纹块中间偏上位置;弓形座角度减小,花纹块表面温差增大;改变上盖闭滑板结构、中套气室位置、花纹块与弓形座配合方式及弓形座材料,花纹块表面温差变化不大,但是花纹块厚度对花纹块表面温差影响较大。     

AUTOCAD三维建模在活络模铝花纹圈钢片设计中的应用

子午线轮胎活络模具是子午线轮胎生产中最后一道工序——硫化用的模具。在汽车工业飞速发展的今天．子午线轮胎的质量要求越来越高,相应的对子午线轮胎模具的质量要求和复杂程度也越来越高。而作为轮胎模具花纹上重要组成部分——钢片的设计质量也变得十分重要,因此设计人员需要开发新的设计方法,以适应市场的需求。     

汽车保险杠注塑模的开发

以注塑模开发流程为主线,简要介绍了汽车保险杠注塑模的设计(包括浇口、分型面、导向定位、冷却水道、材料、热处理及标准件)、模具加工、注射成型及制品检验的要点。对注塑模的开发,特别是汽车保险杠注塑模的开发具有重要的参考价值。     

Preparation and properties of transparent thermoplastic segmented polyurethanes derived from different polyols

Various segmented polyurethanes of different soft segment structure with hard segment content of about 50 wt% were prepared from 4,4′‐diphenylmethane diisocyanate (MDI), 1,4‐butanediol and different polyols with a M_n of 2000 by a one‐shot, hand‐cast bulk polymerization method. The polyols used were a poly(tetramethylene ether)glycol, a poly(tetramethylene adipate)glycol, a polycaprolactonediol and two polycarbonatediols. The segmented polyurethanes were characterized by gel permeation chromatography (GPC), UV‐visible spectrometry, differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), X‐ray diffraction, and their tensile properties and Shore A hardness were determined. The DSC and DMA data indicate that the miscibility between the soft segments and the hard segments of the segmented polyurethanes is dependent on the type of the soft segment, and follows the order: polycarbonate segments > polyester segments > polyether segments. The miscibility between the soft segments and the hard segments plays an important role in determining the transparency of the segmented polyurethanes. As the miscibility increases, the transparency of the segmented polyurethanes increases accordingly. The segmented polyurethanes exhibit high elongation and show ductile behavior. The tensile properties are also affected by the type of the soft segment to some extent. POLYM. ENG. SCI., 47:695–701, 2007. © 2007 Society of Plastics Engineers.     

Structure-property behavior of elastomeric segmented PTMO–ionene polymers. II

A series of segmented ionene polymers based on the reaction of α,ω-bis(dimethyl amino)polytetramethylene oxide with various dihalide compounds were investigated with respect to their structure–property behavior. The placement of quaternary ammonium ions and halide counterions along the polymer chains was varied by changing the molecular weight of the PTMO soft segment and the structure of the dihalide linking agent. The techniques of dynamic mechanical spectroscopy, thermal analysis, small angle X-ray scattering, and stress–strain behavior analysis were applied. For the case when the PTMO soft segment was amorphous, the ambient temperature properties of these materials displayed low modulus, high strength, and high elongation elastomeric behavior with tensile strength enhanced by the strain-induced crystallization of the PTMO. A high level of phase separation existed between the dihalide component relative to the PTMO soft segment. Due to the Coulombic association of the ionene species, these materials displayed many similarities to the segmented urethane ionomers. In particular, distinct domain structure was noted by SAXS, whose dimensional scale was similar to the segmented urethanes. It was also shown, however, that the driving forces for the microphase separation was caused by favorable electrostatic or Coulombic interactions in contrast to segment–segment incompatibility features as in the segmented urethanes.     

轮胎模具钢花纹块CAD/CAM技术应用

阐述了运用高端CAD/CAM软件UG进行轮胎模具钢花纹块的加工过程,实现了轮胎模具钢花纹块的三维造型及数控加工,使模具生产实现高精度,高效率和高度自动化.提高了模具的加工质量,取得了良好的经济效益.     

Enhancement of resin transfer molding using articulated tooling

Mold articulation is introduced in this concept for resin transfer molding (RTM) to increase mold fill times and potentially allow for the use of high viscosity, hot melt resin systems, or thermoplastics. Following a brief review of conventional RTM and a discussion of the limitations on the factors that control fluid flow through porous media, the articulated concept is described. This is followed by an explanation of the sequence of motion of an articulated segmented mold necessary for consolidation, void removal and accelerated fluid flow through a fibrous preform. An analysis of the process using a fiber preform with orthotropic permeability is outlined from which mold fill time is obtained. This is compared with conventional RTM mold fill times using typical resin properties and fiber volume fractions. For the conservative assumptions used, an improvement by a factor of ten in mold fill time is achieved using the articulated process relative to conventional RTM.     

Effect of the degree of soft and hard segment ordering on the morphology and mechanical behavior of semicrystalline segmented polyurethanes

The hierarchical microstructure responsible for the unique energy-absorbing properties of natural materials, like native spider silk and wood, motivated the development of segmented polyurethanes with soft segments containing multiple levels of order. As a first step in correlating the effects of crystallinity in the soft segment phase to the hard segment phase, we chose to examine the morphology and mechanical behavior of polyurethanes containing polyether soft blocks with varying tendencies to crystallize and phase segregate and the evolution of the microstructure with deformation. A series of high molecular weight polyurethanes containing poly(ethylene oxide) (PEO) (1000 and 4600 g/mol) and poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) (1900 g/mol) soft segments with varying hard segment content were synthesized using a two-step solution polymerization method. The presence of soft segment crystallinity (PEO 1000 g/mol) was shown to improve the storage modulus of the segmented polyurethanes below the T_m of the soft block and to enhance toughness compared to the PEO-PPO-PEO soft segment polyurethanes. We postulate that this enhancement in mechanical behavior is the result of crystalline soft regions that serve as an additional load-bearing component during deformation. Morphological characterization also revealed that the microstructure of the segmented polyurethanes shifts from soft segment continuous to interconnected and/or hard domain continuous with increasing hard segment size, resulting in diminished ultimate elongation, but enhanced initial moduli and tensile strengths. Tuning the soft segment phase crystallinity may ultimately lead to tougher polyurethane fibers.     

纳米TiO_2对嵌段聚醚酯结晶及相态结构的影响

利用原位聚合制备了纳米TiO_2质量分数为0.5%～1.5%的聚醚酯/纳米TiO_2复合材料;分析研究了纳米TiO_2对嵌段聚醚酯结晶及相态结构的影响。结果表明:TiO_2的加入使硬段结晶的熔点下降,软段结晶的熔点升高;硬段的结晶起始温度随TiO_2含量增加稍移向高温,软段的结晶温度也随TiO_2含量增多向高温移动。玻璃化转变温度随TiO_2含量的增加而稍有升高。添加质量分数0.5%TiO_2的聚醚酯储能模量(E′)与频率(ω)的关系与聚醚酯相似,在低频区域出现末端区效应,显示嵌段聚醚酯具有微相分离的相态结构;当TiO_2质量分数1.0%～1.5%,E′与ω基本成线性关系,说明聚醚酯相分离程度减小,呈现均相结构特征。     

Thermoplastic polyurethanes from renewable resources: effect of soft segment chemical structure and molecular weight on morphology and final properties

The effect of soft segment molecular weight and chemical structure on the morphology and final properties of segmented thermoplastic polyurethanes containing various hard segment contents has been investigated from the viewpoint of the degree of microphase separation. Vegetable oil‐based polyesters and corn sugar‐based chain extender have been used as renewable resources. The synthesis has been carried out in bulk without catalyst using a two‐step polymerization process. Physicochemical, thermal and mechanical properties, and also morphology, have been studied using Fourier transform infrared spectroscopy, differential scanning calorimetry, dynamic mechanical analysis, atomic force microscopy, X‐ray diffraction and mechanical testing. Chemical structure and molecular weight of polyols strongly affect the properties of the synthesized segmented thermoplastic polyurethanes. An increase in soft segment molecular weight leads to an increase of the degree of soft segment crystallinity and microphase separation, thus giving enhanced mechanical properties and higher thermal stability. Copyright © 2012 Society of Chemical Industry     

Polyether‐segmented nylon hemodialysis membrane. VII. Studies on surface structures of various poly(ethylene oxide)‐segmented nylon membranes

The relationships of the surface morphologies to the surface chemical compositions in poly(ethylene oxide)‐segmented nylon (PEO–Ny) membranes prepared by the phase‐inversion method were studied using scanning electron microscopy (SEM), electron spectroscopy for chemical analysis (ESCA), and static secondary ion mass spectrometry (SSIMS). The PEO–Ny's used were high semicrystalline PEO‐segmented polyiminosebacoyliminohexamethylene (PEO–Ny610), low semicrystalline PEO‐segmented poly(iminosebacoylimino‐m‐xylylene) (PEO–NyM10), and amorphous PEO‐ segmented poly(iminoisophthaloyliminomethylene‐1,3‐cyclohexylenemethylene) (PEO–NyBI). SEM observation showed that the surfaces of the PEO–Ny610 and PEO–NyM10 membranes were composed of crystalline spherulite and that the PEO–NyBI membrane surface had a nodular structure. ESCA analysis exhibited the enrichment of the PEO segment at the surfaces of the PEO–Ny610 and PEO–NyM10 membranes. On the other hand, the enrichment of the Ny segment was observed in the case of the PEO–NyBI membrane. SSIMS analysis revealed that the outermost surfaces of the PEO–Ny membranes except the PEO–NyBI membrane were almost covered with the PEO segment. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 517–528, 2000     

B型硫化机平移式隐形导轨设计

B型硫化机主运动由传统的垂直升降－翻转改进为垂直升降－平移,其可行性是设计了隐形导轨,这有利于洛络模使用的安全,寿命的提高,确保硫化轮胎的精度。