可换镶件式隔圈模具设计与制造

针对超薄塑料材料的手机镜头隔圈类零件复合冲形模具的结构进行了设计。为了较大地缩短类似零件模具的制造周期，模具结构采用了可换镶件式结构形式。为了提高模具的产能，模具的模腔数量设计为一模三腔。介绍了该模具的结构特点、工作过程和制造工艺，模具试生产验证该结构合理，生产效率高，有很好的技术经济效益。     

可换型腔、可换型芯在塑料模中的应用

对塑料模能否标准化设计、生产进行了研究,对模具结构中的型腔、型芯进行了改进设计,使其结构的标准化程度进一步提高.论述了可换型腔和可换型芯固定板在塑料模具设计制造中的重要性,分析了该技术在模具制造中的应用.结果表明,该技术能快速、高效、低成本地制造模具.     

催化剂多功能成型机的设计

本文阐述了集捏和,挤条,整形造粒为一体的催化剂多功能成型机的原理和结构。     

电梯传动轮高频淬火

某公司的电梯传动轮形状如图1所示,材料为FC300（日本灰铸铁牌号,相当国内HT300）,主要化学成分（质量分数,％）为2．9～3．1C、1．9～3．2Si、0．8～1．1Mn、≤0．15P、≤0．12S、1．0～1．2Cu、≤0．5Mo。齿部经高频淬火处理,原始组织中珠光体占99％,细小的片状石墨应符合ISO945：1975《铸铁石墨显微组织的分类》标准中规定的A型5～7级,硬度为220-260HB、实体强度〉240MPa。     

高频感应加热设备温度控制系统的设计

温度控制系统硬件由工控机、采温模块、模拟量输出卡、热电偶组成.以PI算法作为控制方式,使用Visual Basic6.0作为开发工具.实验证明,温度控制系统可在3 min内逼近设定目标,达到平衡后,误差<0.8%,能满足热加工工艺的需要.     

Technology for depositing multifunctional coatings on machine components

A quality control system approach methodology of the engineering industry product operability assurance is developed applying surface engineering modern means, operating conditions diagnostics, component surface layer bearing capacity upgrading techniques, and function restoration at product life stages.     

汽轮机叶片司太立合金高频钎焊工艺

汽轮机动叶片 (以下称叶片 )的工作条件恶劣 ,对材料的要求苛刻 ,叶片的水蚀防护要求较高。为了降低制造成本 ,某电厂机组末级叶片采用在1Ｃｒ12Ｎｉ3Ｍｏ1ＶＮ (Ｓ/ＳＪ2 )材料上高频钎焊司太立合金片的方法 ,替代 17- 4ＰＨ材质的叶片 ,既达到了防水蚀的要求又降低了制造成本。1　试件制备在 1Ｃｒ12Ｎｉ3Ｍｏ1ＶＮ长 4 30ｍｍ、宽 12 0ｍｍ、厚15ｍｍ的两块试板的一侧 ,加工出 2 6 0ｍｍ× 12ｍｍ凹槽。凹槽底部厚 2ｍｍ ,完全模拟正式生产中的叶片钎焊合金片凹槽尺寸。2　焊前准备　(1)按技术条件检查叶片及凹槽加工尺寸和质量 ,并进行…     

转向节高频感应淬火工艺及裂纹分析

对高频感应淬火过程中转向节产生裂纹的原因进行初步分析,并制定预防措施.     

CT80钢级高频焊接连续油管焊接规范初探

通过宏观、微观金相分析和压扁试验结果对不同焊接规范条件下CT80钢级Φ38.1mm×3.18mm高频焊接连续油管焊接接头试样进行评价,总结了按不同焊接规范生产的产品质量水平和压扁试样断口特征,为评价焊接规范合理性以及确定合理焊接规范提供了依据。     

高频脉冲电子束偏压电源设计

为了实现具有陡峭上升沿和下降沿的高频脉冲偏压,改善高频脉冲电子束束流品质,提出了基值偏压直流电源、脉冲偏压直流电源和高压斩波主电路串联的主电路结构。高压斩波主电路通过MOSFET功率开关管导通和关断将脉冲偏压直流电源变换为高频脉冲偏压输出,使脉冲偏压具有快速变化的上升沿和下降沿;基于调制解调工作原理,设计了高压隔离通讯电源,实现了脉冲频率、占空比等高频脉冲偏压参数及命令从低压电路向高压斩波电路的可靠传输并生成PWM波形;设计了专门的高压隔离供电电源,实现了高压端高压斩波电路的可靠供电与驱动。基于上述技术,研制出高频脉冲电子束偏压电源,获得了具有陡峭上升沿和下降沿的高频脉冲偏压输出,20 kHz时脉冲偏压上升沿≤1μs。     

铜触头的高频钎焊

叙述了焊接一种大面积铜触头由气体火焰钎焊改为高频钎焊的研究过程.通过更换钎料,设计合适的感应线圈,选用合适的焊接工艺参数,焊接出合格的产品.经肉眼观察、滚压实验、金相分析和扫描电镜的全面检测,触头的高频钎焊质量优良,符合设计要求.该研究对提高铜触头的焊接合格率,降低生产成本,节省焊接时间并大幅提高生产率,减轻劳动强度和改善劳动环境都有极大的价值.     

Ta-doped multifunctional bioactive nanostructured films

Ta-doped multifunctional bioactive nanostructured films (MuBiNaFs) were deposited by DC magnetron sputtering or ion implantation assisted magnetron sputtering of composite (Ti,Ta)C + Ca₃(PO₄)₂ and (Ti,Ta)C + CaO targets produced by self-propagating high-temperature synthesis method. The films were characterized in terms of their structure, elemental and phase composition using X-ray diffraction, transmission electron microscopy, X-ray photoelectron, Raman, and IR spectroscopy. The films deposited in an Ar atmosphere consisted of (Ti,Ta)C, Ti_xO_y, and CaO phases in an amorphous matrix with P-O, C-O, and O-H bonding. In the films deposited in a gaseous mixture of Ar + 14%N₂, apart from the (Ti,Ta)(C,N), Ti_xO_y, and CaO phases, the indication of diamond-like carbon, bcc Ta and traces of P-O bonding were observed. The MuBiNaFs demonstrated high hardness in the range of 38-44  GPa, Young's modulus 310-350  GPa, high percentage of elastic recovery 70-75%, low friction coefficient down to 0.17-0.25 (both in air and under physiological solution) and two orders of magnitude lower wear rate compared with Ti substrate. Ti ion implantation of growing films was shown to be an effective instrument to decrease their high internal stress. Static water contact angle measurements indicated hydrophilic nature of film surfaces. The electrochemical tests demonstrated that the Ta-doped films had positive values of corrosion potential with low current density. In vitro studies showed that cultured IAR-2 epitheliocytes and MC3T3-E1 osteoblastic cells were well spread on the surface of films and their actin cytoskeleton was well organized. Osteoblastic cells had a high rate of proliferation on all examined films and expressed alkaline phosphatase activity, an early-stage differentiation marker. The MuBiNaF revealed a high level of biocompatibility and biostability at experiments in vivo.     

Synthetic multifunctional metallic-intermetallic laminate composites

The field of material microstructure design targeted for a specific set of structural and functional properties is now a recognized field of focus in materials science and engineering. This paper describes a new class of structural materials called metallic-intermetallic laminate (MIL) composites, which can have their micro-, meso- and macrostructure designed to achieve a wide array of material properties and tailored to achieve specific functionalities. The superior specific properties of this class of composites makes them extremely attractive for high-performance aerospace applications, and the fabrication method for creating MIL composites allows new embedded technologies to be incorporated into the materials, enhancing their functionality and utility. For more information, contact Kenneth S. Vecchio, University of California at San Diego, Department of Mechanical and Aerospace Engineering, La Jolla, CA 92093-0411; (858) 534-6076; fax (858) 534-5698; e-mail kvecchio@ucsd.edu.     

High-frequency properties of Si-doped Z-type hexaferrites

In order to improve the high-frequency electromagnetic properties of (Co_0.4Zn_0.6)₂Z hexaferrites sintered at low-temperature, such as low magnetic loss tangent, low dielectric constant and loss tangent, SiO₂ was introduced. The effects of SiO₂ additive on the phase composition, microstructures and high-frequency electromagnetic properties of the ceramics prepared by a solid-state reaction method were investigated. The results from XRD show that in the doped samples the major phase, Z-type phase, coexists with a small amount of silicate phase. The grain growth of ceramics is suppressed by SiO₂ concentrated on grain boundaries and formed block stacking structure. As SiO₂ content increases, the static permeability and the dielectric constant continuously decrease. The samples with SiO₂ have lower magnetic loss tangent than that of the undoped sample. Meanwhile, all the samples with SiO₂ additive exhibit a low dielectric loss in the range of 400 MHz to 1 GHz. These materials are the excellent candidates to produce chip inductors for high-frequency use.     

内孔高频淬火工艺研究

研究了高频淬火加热方式、加热参数、感应圈的设计以及淬火介质对零件硬度的影响。结果表明:采购一定规格的N型导磁体,制作适当的感应圈,加热到(880～900)℃,用今禹8-20淬火液冷却,就可以满足零件的技术要求。     

不规则表面的高频模糊淬火

零件高频表面淬火时 ,其感应圈与工件之间的间隙 a通常取 1.5 - 5 m m。进一步 ,在保证工件与感应圈不接触的前提下 ,要求间隙越小越好 ,这样可充分利用感应圈的圆环效应和临近效应 ,以获得最大的加热速度和最高的加热效率。上述规定对于规则表面 (如圆柱表面 )是适用的 ,但对于不规则表面则不一定适用。图 1中两端 15圆柱表面和中间不规则表面要求高频表面淬火 ,外圆和凹槽 (钢球接触部位 )表面硬度要求≥ 5 5 HRC,硬化层深度 1.5～ 2 .5 mm。按常规取 a=3mm(感应圈内径2 1mm ) ,用连续方法加热淬火时 ,两尖角处总是容易过热甚至淬裂 ,…     

高频焊管热张力减径后的在线快速冷却设备及其应用

分析了高频焊管热张力减径后在线快速冷却工艺的特点、设备结构组成、工作原理等,研究了TG26材质Φ139.7 mm×7.72 mm规格高频焊管在线快冷后的力学性能和金相组织。经检验,高频焊管热张力减径后在线冷却控冷工艺使钢管组织和性能得到提升,大幅降低后续离线热处理等工艺的生产成本,提高生产效率。该冷却设备的现场应用效果良好。