摆板式脱模机构设计

摆板式脱模机构设计沈阳化工学院（辽宁沈阳１１００２１）曾海泉辽宁工学院金雅娜图２模具结构１摆轴２滚针轴承３动模座板４导柱５动模板６弧形型芯７导套８定模板９凹模镶块１０定模座板１１推杆１２拉钩１３摆板１４．弧形拉料杆１引言脱模...     

绝缘盒压模优化设计

介绍了绝缘盒压模的设计及工作过程,通过结构上的优化及后期的试模改进,解决了模具研伤、无法脱模、脱模将"眼镜"结构的绝缘盒拉坏、绝缘盒壁厚不均超差等问题,并大大降低了废品率,显著提高了生产效率。     

盒体成型钻模设计与制造

盒体是用玻璃钢织物以树脂粘接剂在成型模中进行裱糊固化而成,当要求盒体为等壁厚,并且盒体中不得存在着脱胶和聚胶现象时.成型(裱糊)模的结构必须采用盒体的内、外形刚性成型工艺方法,同时要将盒体中多余的胶液从钻套孔中排出.由于盒体的顶部存在着封闭边形式障碍体,阻挡了凹、凸模的拆卸,于是凹、凸模都需要制造成组合的形式.只有如此,组合凹、凸模才能顺利地进行拆卸后实现盒体的脱模,盒体方能确保等壁厚扣不存在着脱胶和聚胶现象,实践也已经证明了这种模具结构能确保盒体的成型质量.     

空调器电路盒弯曲模设计

介绍了盒件弯曲模具的设计思路，模具结构，着重介绍了弯周边模具主要工作零件设计，其中活动凸模模向移动装置是一种较好的弯曲件脱模机构。     

塑料片材凹模成型工艺的分类及成型机理

塑料片材凹模成型工艺的分类及成型机理扬子设备模具制造有限公司（安徽滁州２３９０６４）胡德云１引言凹模成型是指将加热软化的ＡＢＳ、ＨＩＰＳ片材经抽真空吸附在凹模内表面的一种成型方法。由于凹模成型具有成型圆角小，脱模容易，且由于制件外形同模具接触，因此制...     

供氧面罩主体橡胶模设计

面罩主体是供氧面罩中一个十分重要的橡胶件,其形状曲折复杂,厚度变化大,最薄处仅为0.7mm,面罩主体裙围需与人的脸部造型完全吻合。通过对面罩主体的形体分析,在裙边与裙围转接处存在着弓形高"障碍体",橡胶模便采用了二次分型的方法,使得凸模与凹模及凸模与中模都能够分型,成型面罩主体型腔的中模,是一个大的凸台"障碍体"。面罩主体的脱模,是利用了硅橡胶面罩主体的弹性,采用了手工剥离或吹入压缩空气使其膨胀脱模的形式。在距凹模模腔0.2mm的沿周,制有1.5mm×90°的余胶槽,余胶进入余胶槽中形成飞边,凹槽边缘与型腔边缘所形成的0.20mm刃口,当面罩主体压制后脱模时,飞边能自动被刃口切落。模具结构的形式,实现了面罩主体顺利成型和脱模及飞边的处理。     

空调器电器盒弯曲模设计

介绍了盒形件弯曲模具的设计思路、模具结构 ,着重介绍了弯周边模具主要工作零件设计 ,其中活动凸模横向移动装置是一种较好的弯曲件脱模机构。     

多层薄壁零件冷挤压模设计

介绍的多层薄壁零件冷挤压模 ,采用镶套式组合凸、凹模和浮动凹模结构 ,不仅解决了型腔制造和工件脱模的困难 ,而且改善了模具的填充、排气性能     

便携式CD机前盖注射模设计

根据便携式CD机前盖塑件的结构特点及工艺要求,分析其成型工艺性,对其注射成型模具进行设计。分型面选在不影响塑件外观的最大截面处,动模侧脱模。成型零件选用整体嵌入式结构,塑件上的侧凹选用单斜销滑块式外抽芯结构进行抽芯,进行一模两腔平衡布局。模具整体结构紧凑,模架受力平衡,效果良好。     

基于浮动凹模的航空斜齿轮锻造模具设计

针对航空斜齿轮螺旋角造成锻造成形充填不满及脱模困难的问题,设计了闭式浮动凹模的斜齿轮锻造模具;合理地设计了轴承式凹模结构,使锻件能够顺利脱模;增加了套筒飞边槽结构,以避免横向飞边的产生和减少纵向毛刺.     

碱性低氢电焊条交流稳弧性试验研究

本文采用正交回归设计方法,对碱性低氢电焊条交流稳弧性进行了试验研究,分别建立了断弧长度,平均灭弧次数对焊条药皮各成分的回归方程,分析讨论了碱性低氢焊条交流稳弧性的影响因素,研制成功了交流稳弧性特别优良,其它综合性能均好的“结506稳”电焊条。     

中原油田文23气田气井腐蚀原因分析

采用ＸＲＤ,ＸＰＳ和ＥＰＭＡ对中原油田文２３－１,２３－８气井油管腐蚀产物和管材进行分析,并试验了碳钢在ＣＯ２介质中的腐蚀,研究结果表明,天然气中的ＣＯ２及凝析水是气井腐蚀的主要原因,管材的非金属夹杂物（ＭｎＳ,Ａｌ２Ｏ３）含量超标,是加速油管在ＣＯ２环境中局部腐蚀穿孔破坏的一原因,还探索了应用缓蚀剂防止气井ＣＯ２腐蚀的可能性。     

Evaluation of the invariant reactions in the Ta-rich region of the Ta-B system

Invariant reactions in the Ta-rich side of the Ta-B system were evaluated. The alloys were arc melted from pure materials. Pellets prepared from powder mixtures of Ta and TaB were heat treated under vacuum at 1900 and 1950 °C. The microstructures of the alloys were characterized through scanning electron microscopy images and x-ray diffraction (XRD). The microstructural analyses confirmed the type of reactions occurring in Ta-rich region; however, the composition of the liquid phase should be altered: (a) L ↔ Ta_SS+Ta₂B from 23 to 18 at.% B and (b) L+TaB↔Ta₂B from 27 to 22.5 at.% B. The formation of Ta₃B₂ was confirmed as the understoichiometry of Ta₂B. The decomposition of Ta₂B occurs between 1900 and 1950 °C. The XRD data for alloys with composition between 34 and 50 at.% B indicate the existence of a new high-temperature phase.     

The influence of the potential sweep rate on the computation of the polarization resistance

The influence of the potential sweep rate on the response of an electrochemical system, represented in the vicinity of its mixed potential by a simple electric network, has been studied using the Laplace transform and the Heaviside function and considering only the first period of a triangular wave. Such an approach permitted to obtain the analytical expressions of the current over the intervals [0, ]and [, T]as a function both of t and η. Some equations for computing R_pa are given and a method for determining the degree of hysteresis relating to the forward and reverse sweeps is suggested. The case discussed by Macdonald has been examined by considering the response of the network over the [− 10, 10]mV ΔE interval and assuming that at t = Q the system is in a steady state. The results concerning R_pa computed using the derivative scheme show that the sweep rate does not affect its value when a₀ < 10 mVs⁻¹, whereas the method proposed by Macdonald is practically insensitive to the increase of the sweep rate until to a₀ = 200 mVs⁻¹. Using the derivative scheme R_pa, takes values rather close to 0Ω cm² for a₀ ≥ 200mVs⁻¹. The decrease in the value of C attenuates the influence of the sweep rate as it is shown by the behaviour of R_pa and hysteresis degree. The use of the integral formulation for computing R_pa gives values which are quite different from those obtained using the derivative scheme when a₀ ≥ 1 mVs⁻¹, but exhibit the same trend as a function of a₀. Finally the derivative of the hysteresis degree at can be used to compute C when the values of R_s and R_p are known.     

The kinetics of growth and the critical conditions for the formation of the most-stable oxide in the oxidation of binary alloys

During the growth of the most-stable oxide BO _v in the oxidation of binary alloys containing nonnoble components A and B, the oxygen pressure prevailing at the alloy-scale interface is higher than the corresponding value for equilibrium between BO _v and pure B. The effects of this change on the rate constant for the growth of BO _v and on the critical concentration of B in the bulk alloy required for the stability of BO _v on its surface are examined and discussed. The general treatment is then applied to the growth of NiO on Cu–Ni alloys and of Cr₂O₃ on Fe–Cr, Co–Cr, and Ni–Cr alloys by using appropriate defect models for these oxides, considering also the possibility of oxide doping.     

On the Nature of the Effect of Copper on the Corrosion Resistance of Iron

Sections of the Fe–Cu–O system diagram and based on them potential–pH diagrams of the Fe–Cu–H₂O general system and the system ferrite of 12 steel + copper inclusions (-phase)–H₂O are constructed for 25°C. Thermodynamic peculiarities of the effect of copper on the chemical and electrochemical stability of iron alloys are discussed. At an ordinary content in steel (tenths of percent), copper not only performs the function of an alloying addition, but also enters into a mixed spinel based on magnetite in the form of CuFe₂O₄, thus enhancing the density and protective properties of the passive film.     

制钛过程中阴极钙钛矿的形成与阳极溢出气体间的关系

采用FFC剑桥工艺在熔融CaCl₂中电解二氧化钛时,钙钛矿是阴极上不可避免形成的相。本文研究了在制备钛的过程中,阴极钙钛矿的形成与阳极释放气体的关系。结果表明,阴极上相的形成主要有三个阶段,包括钙钛矿的形成、钙钛矿的脱氧及钛的低价氧化物脱氧为TiO、和TiO到Ti的脱氧。尽管分解电压低于CaCl₂,但阴极形成的钙钛矿与从阳极释放的气体密切相关。由于短时间内钙钛矿的形成造成过电压,因而阳极释放出氯气,氯气的量取决于TiO₂和电解过程中产生的不同低价钛的量。当钛的低价氧化物介于Ti₃O₅和TiO₂之间时,在第一脱氧阶段TiO₂和氯的质量比为9：2到46：2。在氯气释放的过程中阳极没有明显的消耗。钙钛矿的形成和Ti₂O的脱氧是在熔融CaCl₂中电解制备钛的主要限制性环节。从TiO₂到Ti的总电流效率是24.07％。目前第一阶段的电流效率在22.37％~44.74％之间,第二阶段在30.18％~37.72％之间。     

Determination of the liquidus of the ternary system Cu-Sn-Ti

The liquidus surface of the ternary system Cu-Sn-Ti was established by determining the primary crystallizing phases as well as the phase reactions involving the liquid phase. The τ ₁CuSn₃Ti₅ and Ti₆Sn₅ have a wide field in terms of the primary composition. The primary crystallization of the τ ₂CuSnTi phase was observed in alloys containing 26 or more at.% Sn and up to 10 at.% Ti. In the tin-rich corner, the liquid phase solidifies in a ternary eutectic reaction.     

Determination of the liquidus of the ternary system Cu-Sn-Ti

The liquidus surface of the ternary system Cu-Sn-Ti was established by determining the primary crystallizing phases as well as the phase reactions involving the liquid phase. The τ ₁CuSn₃Ti₅ and Ti₆Sn₅ have a wide field in terms of the primary composition. The primary crystallization of the τ ₂CuSnTi phase was observed in alloys containing 26 or more at.% Sn and up to 10 at.% Ti. In the tin-rich corner, the liquid phase solidifies in a ternary eutectic reaction.