钛合金深孔刀具耐用度及参数优化

深孔钻削钛合金难度大,刀具极易损坏。本文在原来自行设计和制造的内排屑钻孔（BTA）深孔钻头基础上．通过对钛合金材料的深孔加工试验,对改进后的深孔钻头的失效机理进行了分析研究,并探讨了钛合金深孔加工时进给量、刀具转速与耐用度的关系,优化了工艺参数和刀具结构、最终达到提高刀具耐用度的目的。     

基于Open GRIP对注射模推杆进行二次开发

运用Open GRIP语言对注射模推杆进行二次开发,阐述了推杆的设计要点、参数化设计的过程及应用实例分析,针对推杆标准件的系列化特点,输入相关设计参数,即可快速完成推杆的实体建模。参数化设计程序协助设计人员进行设计计算及实体建模,减少设计工作中一些重复性劳动,对轴套类零件的参数化设计具有一定的参考价值。     

Effect of MQL on the tool life of small twist drills in deep-hole drilling

Drilling of deep and small boreholes using twist drills has to be considered as one of the most difficult metal cutting operations. There are many reasons for this, one of them being that the cutting fluid has to be supplied externally. This research work investigates in how far the manner of supplying and the type of minimum quantity lubricant have an effect on the tool life of coated and uncoated high-speed steel twist drills of 1.5 mm diameter. Deep-hole drilling is performed as the holes, drilled into plain carbon steel, had a depth of 10 times the diameter. The feasibility of dry machining as an appropriate alternative to MQL in deep-hole drilling has also been investigated. This work shows that, compared to a continuous supply of the minimum quantity lubricant, a discontinuous supply brings about a significant reduction in tool life, especially in the case of heat-sensitive drills. With respect to the type of minimum quantity lubricant, a low-viscous type with a high cooling-capability gave rise to a notably prolonged tool life. It is also shown that dry drilling is associated with strongly accelerated tool wear for most of the twist drills tested, resulting in a significant reduction in tool life.     

流量自调式真空发生器的分隔式气-磁驱动技术研究

针对目前使用的射流式真空发生器存在的持续定量供气空气消耗量大的问题,提出了一种新的流量自调式射流真空发生器的总体技术方案.研究了该技术方案中的分隔式气-磁驱动关键技术,提出了真空检测-压差致动和共轴环芯结构非接触式气-磁驱动技术方案.研究了气-磁驱动系统的动态特性并进行了试验.结果表明:共轴环芯气-磁驱动系统的磁驱动起动时间约为0.06s.同时,对共轴环芯结构主要设计参数间的匹配关系进行了试验研究.通过对流量自调式真空发生器的整机测试表明,采用共轴环芯气-磁驱动结构的流量自调式真空发生器在真空产生阶段具有与固定式真空发生器相同的真空响应特性,在真空维持阶段比固定式真空发生器节省供气流量约14.8%.     

Cap rock blast caving of cavity under open pit bench

A laser technique based scanning system was employed to make a comprehensive scanning through borehole for unmapped cavity under open pit bench, then the three-dimensional data will be obtained, and these data were used for theoretical analysis and numerical simulation to analyze the stability of cap rock. Acoustic emission techniques were also adopted to carry out long term real time rupture monitoring in cap rock. Therefore, a complete safety evaluation system for the cap rock was established to ensure safe operation of subsequent blasting processes. The ideal way of eliminating collapse hazard of such cavity is cap rock caving through deep-hole blasting, thus, two deep-hole blasting schemes named as vertical deep-hole blasting scheme and one-time raise driving integrated with deep-hole bench blasting scheme were proposed. The vertical deep-hole blasting scheme has more explosive consumption, but the relatively simple blasting net work structure can greatly reduce workloads. However, the one-time raise driving integrated with deep-hole bench blasting scheme can obviously reduce explosive consumption, but the higher technical requirements on drilling, explosive charging and blasting network will increase workloads.     

型腔模设计中推杆直径的确定

在型腔模设计中 ,推杆直径大小的确定一般是根据经验或依据类比法确定 ,这样确定的推杆往往与生产实际有一定的差距 ,通过对推杆的受力状况进行分析 ,从理论计算角度对推杆直径进行确定。     

手机后盖注射模设计

以手机的后盖为例进行优化,详细阐述了带斜顶杆模具的设计全过程,通过对斜顶杆的改进,解决不同场合中所遇到的各种问题,使塑件脱模顺利,对从事模具设计的人员有较好的借鉴参考作用。     

奥迪A6轿车支架—点火线圈压铸模的设计

采用三维软件Pro/E设计模具，将复杂的空间尺寸转换成一个角度。为保证铸件顺利出型，采用斜顶出机构，靠弹簧预复位。     

奥迪A6轿车支架-点火线圈压铸模的设计

采用三维软件Pro/E设计模具 ,将复杂的空间尺寸转换成一个角度。为保证铸件顺利出型 ,采用斜顶出机构 ,靠弹簧预复位     

大型热芯盒模具排气系统设计

分析了热芯盒模具充型特点,指出在型砂的充型过程中如何快速排出型腔内的气体,以及充型过程中带入的空气是影响壳型质量的一个重要因素.介绍了热芯盒模具分型面排气槽、排气塞以及推杆间隙排气等排气系统设计方法.排气槽排气主要用于充型开始时的排气;排气塞用于型腔内部容易产生困气的部位和需要大量排气的部位;推杆间隙排气用于排气量不大或者开设排气塞会与推出机构产生干涉的部位.这些排气方法互相配合,取长补短,根据壳型要求灵活布置,能起到良好的排气效果,并通过实例应用介绍了这些排气方法的设计原则和工艺参数.     

信号转换装置卡滞故障分析与改进

针对某信号转换装置在试验过程中出现卡滞故障的情况，建立故障树。对于每个故障分支进行机制分析和故障排查，确定故障原因是锁制机构中摇臂与信号转换装置顶杆之间存在夹角，对顶杆产生侧向力，信号转换装置设计时未考虑侧向力的影响；经历多次解锁动作后，信号转换装置顶杆磨伤壳体内孔表面，摩擦因数异常，造成推动信号转换装置顶杆的运动阻力增加，最终导致出现信号转换装置顶杆卡滞故障。通过对信号转换装置结构采取增加支撑长度、减小壳体和顶杆的配合间隙、增大壳体和顶杆轴端搭接量等措施可解决该问题。经试验验证，措施有效。     

线圈架注射模隐形顶出技术

以继电器线圈架为例，介绍了一种隐形顶出方式，对于零件表面不允许有顶出印痕和飞边要求的零件的模具设计提供一种设计思路，希望对类似零件的模具设计有借鉴作用。     

手机模具小斜推杆脱模新设计

分析了手机盖零件的成型工艺性能,改进了模具的结构设计,解决了传统设计方法中存在的细小斜推杆强度太差问题。实践证明,模具结构设计巧妙、尺寸合理、使用可靠,完全解决了细小斜推杆脱模问题,得到了用户认可。     

群钻电火花成形加工及其切削性能的研究

针对群钻结构复杂、采用自动化刃磨困难的问题,提出了应用电火花成形技术加工的方法。该方法能精确成形群钻复杂切削刃的后刀面,加工过程简单且易于操作。同时介绍了工具电极的设计与制造过程以及加工成形后群钻的切削性能。     

工具箱塑料盖大型注射模设计

介绍了某工具箱塑料盖注射模设计,模具采用定模斜推杆进行内侧抽芯,型腔内空气从排气杆周边的间隙排出,斜推杆和推杆均采用橡胶复位机构复位,模具冷却系统设计合理,导向定位系统工作可靠,成型的塑件由推块和推杆联合推出,模具工作稳定,生产的塑件质量良好。     

润肤露瓶盖注射模设计

介绍了定模设置推杆推出机构，动模采用双推管推出机构的带有铰链塑料瓶盖注射模的设计。     

Development of Drill Geometry for Burr Minimization In Drilling

The researchers carried out drilling tests using drills of various shapes to determine burr minimization. The ultimate objective of this study was to develop a compatible drill shape to minimize burr formation. For the experiment general carbide drills, round drills, chamfer drills and step drills are designed and manufactured. Burrs are generated under various cutting conditions using four different materials. A laser sensor was used to measure the burr dimensions. As a result of the experiments, step drill with specific step angle and step size Is suggested for burr minimization.     

New method for determination of the pose of the grinding wheel for thinning drill points

Traditionally, twist drills are reconditioned by thinning the web so the correct chisel edge length is restored. Recently, thinning has been included in the original design of drills so as to reduce torque and tool force. Because the International Standards Organization (ISO) has a system which can comprehensively model conventional twist drills but cannot model thinning specifications, this paper presents a system for precise mathematical modeling and CNC control of a 6-axis grinding workstation for drill thinning. The presented method determines the position and orientation of the grinding wheel based on the evaluated rake and clearance angles of ISO standards for 2-flute twist drills. The mathematical model and background are discussed. For verification and demonstration, two experimental drills are produced to the identical ISO standard except that one is thinned. The modeling herein is of value to industry and research if incorporated into computer software for drill design and manufacture. It is suitable for linear notch-type cutting with controlled variable rake angle along the secondary cutting edge for purposes of thinning, notching, dubbing and advanced drill research.     

可靠性计算在压铸模顶杆设计上的应用

应用刚度可靠性设计的理论 ,对顶杆的工作情况进行分析 ,提出了一种更加合理的顶杆直径计算公式 ,并将其用于实际生产     

可靠性计算在压铸模顶杆设计上的应用

应用刚度可靠性设计的理论 ,对顶杆的工作情况进行分析 ,提出了一种更加合理的顶杆直径计算公式 ,并将其用于实际生产