Cycle Time Reduction in Injection Molding by Using Milled Groove Conformal Cooling

This paper presents simulation study on Milled Grooved conformal cooling channels(MGCCC)in injection molding.MGCCC has a more effective cooling surface area which helps to provide efficient cooling as compared to conventional cooling.A case study of Encloser part is investigated for cycle time reduction and quality improvement.The performance designs of straight drilled are compared with MGCCC by using Autodesk Moldflow Insight(AMI)2016.The results show total 32.1% reduction of cooling time and 9.86% reduction of warpage in case of MGCCC as compared to conventional cooling.

Effect of Different Shapes of Conformal Cooling Channel on the Parameters of Injection Molding

Cooling system improvement is important in injection molding to get betterquality and productivity. The aim of this paper was to compare the different shapes of theconformal cooling channels (CCC) with constant surface area and CCC with constantvolume in injection molding using Mold-flow Insight 2016 software. Also the CCC resultswere compared with conventional cooling channels. Four different shapes of the CCC suchas circular, elliptical, rectangular and semi-circular were proposed. The locations of thecooling channels were also kept constant. The results in terms of cooling time, cycle timereduction and improvement in quality of the product shows that no significant effect ofCCC’s shapes when surface area of CCC kept constant. On the other hand, the rectangularCCC shows better result as compared to other shapes of CCC when volume of CCC werekept constant.

A Tool Path Re-generation Algorithm for Die & Mold Machining

Facing the challenges of a shorter product design a nd manufacturing lead-time, many mold companies are using 3-D CAD/CAM software s ystems in design and manufacturing. A new product file is often issued to the mo ld design department before it is completely finalized and the design may have t o be iterated many times during the mold design and making processes. In practic e, if a mold has been modified, all the tool paths that cover the modified regio n must be re-generated, no matter how small the modified region may be. With th e available tool path generation systems, if a tool path needs to be re-generat ed, all the cutter location (CL) points must be re-calculated, and none of the original CL points can be re-used. It would require as much time to re-gen erate the modified tool path as in the original case. On the other hand, the mod ified region is usually quite small compared with the entire mold. The complete re-generation process is therefore highly unproductive and time-consuming. This paper proposes an efficient tool path re-generation approach for 3-axis d ie and mold machining. It is assumed in this research that a gouge-free too l path has been generated for the original mold and the same ball end-mill is to be used to generate the tool path for the modified mold. It is shown in th is work that if the boundary of the modified region is interference-free, the a ffected CL points are enclosed by a set of CL points which correspond to the poi nts on the boundary of the modified region. An efficient tool path re-generatio n algorithm was developed in this research. With this algorithm, a closed CL cur ve is first generated from the boundary of the affected region. The CL points fo r the original mold are then analyzed by comparing the x and y values with the b oundary of the affected CL points. If the CL points are not affected by the modi fication, they are output to the new CL file directly. Otherwise, they are remov ed and replaced by the new CL points. The algorithm has been tested using severa l industrial parts, and results show that it is efficient, robust, and the re-g enerated tool path is gouge-free and smooth.

一种涡轮盘榫槽的组合加工刀具设计研究

汽轮机涡轮盘连接叶片的位置通常采用榫槽结构。针对小型燕尾型榫槽,目前常采用一种成型刀具一次加工成型,导致被加工零件精度低、表面粗糙度差且刀具成本高。为解决目前制造工艺的局限性,提出了一种组合刀具设计思路。首先,根据燕尾槽型榫槽的结构特点,设计出4把刀的刀具型线和尺寸参数,通过UG等建模软件建立模型,利用ANSYS软件进行有限元分析;然后,制定组合刀具的制造工艺方案,通过NUMROTO刀具编程软件进行路径规划和程序编制;最后在SAACKE五轴工具磨床上磨削加工出合格的组合刀具。通过仿真及实际切削试验验证了该方案切实可行,相较于传统加工方法,有着加工精度高、表面粗糙度低、切削热低且成本低等优点。

聚氨酯组合物提取工具痕迹效果研究

本文对聚氨酯组合从物理、化学性质等角度展开分析研究,根据反应特性提取以木质、金属、塑料、漆面四种常见的承痕客体上的工具痕迹,以硅橡胶制模法为对照实验,在操作时间、材料性质、提取效果三方面进行对比,来确定聚氨酯组合物是否能代替硅橡胶制模法的可行性。

常见工模具钢分类及热处理工艺

工模具钢是模具制造业的基础,它的选择对模具加工行业中的模具设计和制造有着至关重要的作用。工模具钢广泛应用于汽车、航空航天、无线电仪表等行业,且随着模具加工行业的进步和模具钢的大范围应用,研究工模具钢的性能就显得十分重要。热处理工艺是将模具钢应用于实际中的重要一环,合理的热处理工艺可以改善模具钢的强度性能和工艺性能。目前,在试验研究和实际生产领域已有多种热处理工艺,并且研究人员仍在致力于更加高效、更加绿色的新工艺开发。主要概述了一些常见的工模具钢热处理工艺,并对其发展趋势做出展望。

精密模具的发展与专业人才培养

当今社会中模具制造与生活息息相关,在新时代的今天,制造业的蓬勃发展以超出想象。机械工业的高端发展,数控机床的广泛利用以及高精尖的精密设备都促进了模具行业精度的提高。精密模具已经越来越被厂家认可,高端设备也越来越受到人们的青睐。那么如何才能随着科技水平的发展培养出适应现代化先进技术的高端人才呢?这就需要提高职业技能水平的稳健和扎实,也需要高等职业院校为培养人才做出贡献。

Rapid Tooling Technique Based on Stereolithograph Prototype

Rapid tooling technique based on the sterelithograph prototype is investigated. The epoxy tooling technological process was elucidated. It is analyzed in detail that the epoxy resin formula is easy to cast, curing process, and release agents. The transitional plaster model is also proposed. The mold to encrust mutual.inductors with epoxy and mold to inject plastic soapboxes was made with the technique The tooling needs very little time and cost, for the process is only to achieve the nice replica of the prototype. It is benefit for the trial and small batch of production.

HSM strategy study for hardened die and mold steels manufacturing based on the mechanical and thermal load reduction strategy

The paper discussed cutter-work engagement situation hidden behind the mechanical and thermal load effect on cutting edges during high speed hard machining process. The engagement situation was investigated in great detail using experimental and geometrical analytic measures. Experiments were conducted using A1TiN-coated micro-grain carbide end mill cutters to cut hardened die steel. On the basis, a general high speed hard machining strategy, which aimed at eliminating excessive engagement situation during high-speed machining （HSM） hard machining, was proposed. The strategy includes the procedures to identify prone-to-overload areas where excessive engagement situation occurs and then to create a reliable tool path, which has the effect of cutting load reduction to remove the prone-to-overload areas.

Comparative Moisture Performance of Wood/Wood-Based Claddings Predicted by Four Hygrothermal Simulation Tools

A number of hygrothermal(HAM)numerical simulation packages are available,either wholly or partially dedicated to heat,air and moisture transfer simulations of building materials and wall assemblies.The objective of this work was to compare the HAM responses and moisture performance of western red cedar and composite wood claddings of a wood frame wall as predicted by four HAM simulation tools:DELPHIN,WUFI,hygIRC,and COMSOL.Three Canadian cities having different climates were selected for simulation:Ottawa(ON),Vancouver(BC)and Calgary(AB).In each city,simulations were run for two years as selected from a historical climate data set based on the moisture index(MI).The wall orientation receiving the most wind-driven rain for the two years was selected for simulations.Material properties were taken from the National Research Council(NRC)material property database.Cladding temperature and relative humidity(RH)values as well as the moisture accumulated in the entire structure were compared amongst the results obtained from the four tools.The mold growth index on the cladding surface was used as a basis for comparing the moisture performance.

类椭圆定子模芯加工刀具设计及优化

针对类椭圆螺杆泵定子结构复杂、加工难度大、成本高等问题,通过研究定子模芯螺旋曲面的特性,确定加工定子模芯所需刀片形状为菱形。首先,根据不同导程的定子模芯最小曲率半径变化规律,确定菱形刀片刀尖圆弧半径的选择范围。分析了刀具加工定子模芯的误差,优选出刀盘直径;其次,通过建立刀具加工定子模芯切削过程的有限元模型,分析了加工过程中工件的应力变化情况和刀具的反作用力随时间变化规律;最后,优选出刀具的前角值为8°,后角值为15°,并验证优选出的刀具是合理的,为类椭圆螺杆泵定子模芯及其他复杂曲面的加工刀具设计和优化提供了参考。

现代机械制造工艺与精密加工技术探析

阐述现代机械制造工艺与精密加工技术的特点和应用,包括气体保护焊工艺、现代机械制造工艺、搅拌摩擦焊接工艺、埋弧焊接工艺分析,探讨数控机床、模具成型技术的应用。

氟橡胶粘结垫片成型工艺的优化与改进

优化和改进了一种金属骨架-氟橡胶粘结件成型工艺。结果表明,通过优化机械喷砂、粘合剂选用和模具工装装配等工序,解决了该型制品成型工艺存在的粘合效果不佳、质量一致性差、批次稳定性差和手工去边难度大等问题;改进后,成型工艺稳定可靠,制品合格率提高,成品均符合设计要求。

保护渣添加剂组成对M2高速钢模铸锭表面质量的影响

介绍了模铸对保护渣的要求及常用添加剂的作用,并根据M2高速钢的成分、熔点等特性,通过向通用型模铸保护渣中添加萤石粉、碱粉和可膨胀石墨,对保护渣的熔点、黏度、铺展性进行调整,在生产中进行了大量试验。当单独添加萤石粉7%以上或同时添加萤石粉、碱粉各4%以上时,M2高速钢模铸锭表面粘渣面积比例降低至2%,但锭身恶化严重,出现超5%的凹坑;当萤石粉、碱粉及可膨胀石墨均添加4%时,铸锭表面粘渣面积比例降低至0%,锭身表面良好,满足了M2模铸高速钢的使用要求。适合M2系列高速钢模铸保护渣的化学成分为(18~21)%TC,(29~34)%SiO_(2),(14~17)%Al2O3,(12~15)%CaO,(4~7)%Na_(2)O,(2~4)%Fe_(2)O_(3),(1~3)%MgO,(2~4)%F,(0.5~2)%K2O。

非金属八字缆施工问题剖析与正确施工方法

本文所述针对束管式非金属八字光缆敷设在符合要求杆件出现缩纤、断纤等问题,首先,从产品的结构及设计角度进行简要论述,接着就施工细节及注意点进行深入浅出分析,提出一种层绞式非金属八字光缆解决方案及正确施工方法,为农网最后一公里光纤入户施工提供借鉴性建设意见。

铜加工连续挤压工装模具的改进

连续挤压技术属于一种金属性的塑性加工技术,具有明显的优势,将其与传统的挤压技术对比就可以发现,连续挤压技术具有节约资源、提高利用率与降低成本的优势,将其用于铜加工中可以更好地发挥作用。在对铜加工连续挤压工装模具的工艺改进中,通过设计不同长度的挤压模具进行分析,其中包括偏心结构的挤压模具设计,从而增加延伸槽的面积,并在此期间安装夹紧环,在初始阶段进行预热。该文通过比较铜加工连续挤压工装模具工艺改进前后的材料性能对比设计一种新型的连续挤压工具模具,用于加工铜材,在铜材使用期间能节约铜材、降低成本、提升模具的实际使用寿命,取得良好的经济效益。

面向柔性大面积空间扭转曲面产品模具设计

为解决柔性大面积空间扭转曲面产品的成形、法向定位孔加工和振动工装设计问题,利用制造模具和振动工装共同点,通过结构创新设计,有效地解决了靠模、钻模和振动工装一体化设计的问题。同时通过分型设计,独立加工,克服了大面积曲面法向孔无法利用三轴机床精确加工的难点。经检测和试验验证,模具结构设计合理,定位孔位置度满足要求,产品成形完整,可在降本增效的同时为类似产品开模提供设计思路。

模具制造中的高速加工技术

分析了传统电加工工艺在模具制造中存在的主要问题 ,介绍了超高速加工技术的主要特点 ,论述了超高速加工用于模具制造的关键技术 ,列举了一些应用实例和使用效果 。

基于UG的斜齿轮三维参数化设计方法——扫描成型法

提出一种斜齿轮三维参数化通用设计方法———扫描成型法。该方法利用UG软件的相关功能 ,生成斜齿轮的端面和法面轮廓线 ,并沿螺旋线扫描获得斜齿轮廓面 ;通过对造型实体进行裁剪操作生成单个轮齿 ,然后通过布尔运算获得完整轮齿 。