水平钢化炉的温度控制

通过分析水平钢化炉中玻璃在加热过程中从热量产生到热量传递的基本原理,提出通过合理布局加热元件及加强热风循环的作用,并辅以相应的控温方法来提高水平钢化炉玻璃加热的工艺水平.     

快速加热水平钢化玻璃的方法

主要论述了使用水平钢化工艺方法对玻璃加热的加热原理,提出了快速加热玻璃温度的方法应用,为生产平、弯水平钢化炉的设备制造提供了理论依据.     

一种用于高温内循环的卧式离心风机

在玻璃深加工行业,钢化炉作为钢化玻璃的核心设备,经常使用高温内循环风机来增加玻璃在炉内的加热速率.为使玻璃加热均匀且效率高,在一些特定工况下,需要高风压对玻璃进行加热,因此要求高温风机做成蜗壳离心式保证风压,而插入式蜗壳离心风机拆装相对困难,给专业人员带来很多不便.本文详细介绍了一种用于高温内循环的卧式离心风机,详细阐述了高温内循环的卧式离心风机的技术方案、结构原理,并详细论述了高温内循环的卧式离心风机在玻璃钢化炉上拆装的简便性优点.     

专利文摘

一种水平玻璃曲面钢化的方法;螺旋形节能灯管成型装置;一种玻璃钢化炉的控温炉丝结构;应用于模造玻璃的模芯;玻璃容器压嘴机……     

轨道式多工位化学钢化炉的探索与开发

通过对国内外化学钢化炉的认识和作者对玻璃运输、加热、钢化、冷却等方面的关键技术研究，设计了一款突破传统的化学钢化炉，以其成为相关玻璃企业的得力助手。     

浅谈2 mm超白压延玻璃钢化工艺

改进现有钢化炉装置,通过输送超白压延玻璃原片,依次匀速进入钢化炉加热区、加速进入空位区和定速进入冷风区的分段控制模式,进行多个加温区间升温和降温的工艺操作,克服2 mm超白压延玻璃钢化极易变形的缺陷,达到了优异钢化效果。     

水平钢化玻璃快速加热工艺的探讨

本文主要论述了使用水平钢化工艺方法对玻璃加热的加热原理，提出了快速加热玻璃的方法应用，为平、弯水平钢化炉的设备制造提供了理论依据。     

钢化炉使用攻略

1钢化炉在生产过程中的操作1.1入片操作玻璃必须经过磨边和清洗干净,且无损伤,方可放至入片台,玻璃之间的摆放距离≥50mm,生产薄而小的玻璃可适当加大摆放间距。摆放玻璃的总宽度和总长度不得超过钢化炉型号规定的规格,否则可能造成卡门等故障,玻璃摆放好并点动入片台到入片位后,在生产形式时按“进炉按钮”后,如炉内无玻璃,则入片台上的玻璃将立即进入钢化炉,如炉内有玻璃,在此期间,如操作台上的旋钮打到自动时,炉内玻璃出炉后,玻璃将自动入炉,如果旋钮打到半自动,那么还需要再次按“进炉按钮”,玻璃将会自动入炉。另外,在入片时计算机会自动检测玻璃长度,自动控制在炉内的摆动幅度,用来提高玻璃在炉内加热的均匀性。     

世界最大钢化机组落户上海--平弯钢化炉建成投产

日前,世界最大的水平式平弯玻璃钢化炉在上海皓晶玻璃制品有限公司正式投产,这标志着我国钢化炉的制造水平又上一个台阶.该钢化机组由秦皇岛运通玻璃机电技术有限公司承接设计并制造.机组可生产最大规格为:13000 mm×3300 mm厚度为6～19 mm的平钢化玻璃和5500 mm×3300mm厚度为8～19 mm半径大于1500 mm的弯钢化玻璃.适合浮法、印花及Low-E玻璃的钢化.该钢化机组采用独创的射吸技术,有效提高加热效率,平衡炉内温度,使炉内有一个均匀的温度场.加热采用分散式矩阵加热方式,最大程度地节约了能源,使客户装机功率最小.先进的控制技术可根据整板与散板的不同特点,采用不同钢化参数,最大程度提高生产效率,降低单位产品能耗,提高成品率.本机组若对淬冷部分进行改进,还可生产4mm、5mm的平钢化玻璃和5mm、6mm厚的弯钢化玻璃.该机组在同类产品中属尖端产品,多项技术已申报国家专利.     

浅谈几种常见对流炉的结构

对流加热是目前钢化炉常见的一种加热方式,文章介绍了玻璃对流加热的几种常见结构,并对优缺点进行比较。     

滚塑模具内表面传热系数与模具转速间关系的研究

研究了单轴转动的圆筒形滚塑模具在加热阶段其内表面传热系数与模具转速之间的关系,首先为滚塑工艺的加热阶段建立一个简化的传热模型,然后通过MATLAB软件求解了该模型的微分方程,从而将实验测得的加热时间转换成模具的内表面传热系数.在模具静止和转速较高的工况时,模内粉料的状态是确定且不随时间改变的,因此可通过FLUENT软件...     

High‐frequency proximity heating for injection molding applications

High‐frequency proximity heating was used to rapidly heat injection molds. The principle is based on the proximity effect between a pair of mold inserts facing each other with a small gap and forming a high‐frequency electric loop. Because of the proximity effect, the high‐frequency current will flow at the inner surfaces of the facing pair, thus selectively heating the mold surface. With this method, the electrical insulation layer beneath the mold surface can be eliminated, resulting in a mold insert made of a single metal. A mold with a cavity of 25 × 50 mm² was constructed with careful design on its electrical, structural, and thermal performance. Air pockets with reinforcing ribs were embedded right beneath the mold surface for enhancing the heating performance. The resulting mold cavity can be rapidly heated from room temperature to about 240°C in 5 s with an apparent heating power of 93 W/cm². The new mold heating method was applied to thin‐wall molding and micromolding, and in all testing cases, short cycle times less than a minute were achieved. POLYM. ENG. SCI. 46:938–945, 2006. © 2006 Society of Plastics Engineers     

微注射成型中变模温控制技术

阐述了变模温控制在微注射成型中的重要性，介绍、比较了当前出现的电热水冷、感应加热、薄膜电阻式加热、复合模壁绝热-加热、复合模壁绝热-压缩热空气加热几种变模温控制实现方法，展望了未来微注射成型中变模温控制的发展趋势。     

Fully-Coupled Numerical Analysis of High-Frequency Induction Heating for Thin-Wall Injection Molding

In recent years, rapid mold heating has served to enable the injection molding of thin-walled parts or micro/nano structures. Induction heating is an efficient way to heat metal parts by means of an electric current that flows through a conductive material by electromagnetic induction. The present study covers a numerical investigation of high-frequency induction heating of an injection mold in order to rapidly raise the mold temperature. To take into account the effects of thermal boundary conditions of induction heating, a fully coupled numerical analysis effectively connecting electromagnetic field calculation, heat transfer analysis, and injection molding simulation was carried out. The proposed integrated simulation was applied to the injection molding of a thin-wall part, and its results were compared with experimental findings in order to verify the validity of the proposed simulation.     

Experimental investigation of infrared rapid surface heating for injection molding

A low cost and practical infrared rapid surface heating system for injection molding is designed and investigated. The system was designed to assemble on the mold and a control system was used to operate the motion of the lamp holder. Four infrared halogen lamps (1 kW each) were used as the radiative source to heat the surface of mold insert. The temperature increase is verified on the mold plate with a thermal video system. Two types of specular reflectors combined with different bulb configurations were applied to study the heating ability of radiation heating. A modified spiral flow mold was used to test the enhancing filling ability of the rapid surface heating system. Three resins, PP, PMMA and PC were molded in the spiral flow injection molding experiments. If spherical reflector and centralized lamp configuration are used, the temperature at the center of the mold surface is the highest. The temperature of mold center surface is raised from 83°C to 188°C with 15 s of infrared heating. Because the surface temperature of the mold insert is higher than the glass transition temperature of resins before filling, the flow distance of resins in the modified spiral flow mold will be increased. The location effect of the infrared surface heating system on a thin‐long cavity was studied to demonstrate the possibility of using smaller infrared heating area on a large mold surface. A microprobe cavity also demonstrated that with the assistance of infrared heating technology the formability of a microprobe can be greatly improved. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 3704–3713, 2006     

高光注射成型及其关键技术

简述了高光塑料产品注射成型技术的原理和流程,介绍了高光塑料材料、高光模具材料与结构、模面加热方法与模具温度控制系统等关键技术及其应用,并分析了高光注射成型发展趋势.     

滚塑工艺加热阶段的传热模型的解析解

对从滚塑模具开始受热到其内部粉料开始熔融之间的加热阶段建立一个传热理论模型。在该模型中，忽略模具、内部空气和粉料的温度梯度，即各自只有一个随时间变化的平均温度。将模具的内部分成内部空气区域和粉料区域。内部空气和粉料在与模具发生对流换热的同时，这两者之间通过掺混也在发生对流换热。根据能量守恒原理，对模具、内部空气和粉料分别列出热能平衡方程式，然后通过简化和求解常微分方程组得到了它们平均温度的解析表达式。由此计算所得的内部空气温度与其实验结果吻合的较好，从而证明了此传热模型及其解析解的准确性。     

直接电加热滚塑工艺的传热分析

通过实验测量了直接电加热的滚塑模具在加热阶段的表面温度和模内温度以及所消耗的电能。然后根据实验数据对该滚塑工艺的加热阶段进行了传热分析,计算了有效热能和无效热能,并提出了评估该滚塑工艺的3个指标参数——热能利用率、加热每单位质量粉料所消耗的电能、加热每单位质量粉料所需的时间。结果表明,该滚塑模具的表面温度具有一定的不均匀性,不同位置处的最大温差为8 ℃。3种实验情形下的最高热能利用率为37.5 %,另外在相同的模内加热温度下,热能利用率随模内粉料质量的增大而减小。     

加温底板压模的设计

通过加温底板压模的设计及使用过程,较详尽地介绍了该类模具的结构原理、选材原则、热处理要求及配合间隙等情况,其中模具的顶出机构很有特点。     

Multiobjective optimization design of heating system in electric heating rapid thermal cycling mold for yielding high gloss parts

An optimization design method is developed for the electric heating system in rapid thermal cycling molding (RTCM) mold. First, a multiobjective optimization model is established, in which the distance between the mold cavity surface and the center of heating elements and the number and power density of heating elements are the design variables, the required heating time t_h and the highest cavity surface temperature T_max at time t_h are the objective functions. Then, an optimization strategy consisting of design of experiment, finite element analysis, artificial neural network (ANN) and response surface methodology (RSM) models, and Pareto‐based genetic algorithm is proposed to solve the multiobjective optimization model. Finally, the optimization strategy is applied for the design of the heating system for an automotive spoiler blow mold. The results show that the temperature distribution uniformity on the blow mold cavity surface is obviously improved and high heating efficiency is also ensured with the optimized design parameters. Moreover, the ANN model exhibits its superiority over the RSM model in terms of modeling and predictive abilities. A RTCM blow mold with the optimized electric heating system is constructed and successfully utilized to mold high gloss automotive spoiler. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2014 , 131, 39976.