微型液压钻的应用

介绍国外在特殊场所采用的先进钻孔技术的微型液压钻。它具有可手控的永久磁性基座、独特的刀具结构、有效的火花控制和极大的便携性,适用于特殊环境下的钻孔作业。     

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四川目前生产的天然气中含硫天然气占７１％，而含硫天然气对高强度钻杆会产生硫化物应力腐蚀玻裂，因此，在含硫气井进行钻杆测试时，应重视钻杆的安全问题。文章探讨了高强度钻杆硫化物应力腐蚀玻裂的机理和影响钻杆脆断时间的各种因素，并提出在一定的条件下，高强度钻杆在含硫气并中进行测试是安全的。采用向钻杆内加缓蚀剂或内涂层钻杆，防硫油管测试，钻杆测试更加安全。建议继续开展高强度钻杆硫化物应力腐蚀玻裂时间的试验研究，以确定合理的钻杆测试安全时间。     

钻杆内螺纹接头失效分析

介绍了葡北4-11井场新钻杆发生内螺纹接头失效事故的有关情况,对失效钻杆进行了宏观分析与断口微观分析以及材质理化检验,从钻杆结构和载荷两个方面探讨了发生失效事故的主要原因,并提出了改进建议。     

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.     

基于ARM的机械臂控制系统分析

以钻孔机械臂为研究对象,进行了以LPC2138为主控制器的嵌入式系统硬件平台设计,以及LPC2138与伺服驱动电路、液晶显示电路、键盘扫描电路等的接口设计,且着重对机械臂执行机构交流伺服电机的驱动进行了设计研究。     

Experimental and numerical studies on the determination of twist drill temperature in dry drilling: A new approach

In this paper, the influences of the spindle speed and feed rate on the drill temperature responses have been investigated. A new experimental approach was developed to measure drill temperature in drilling process. Drill temperatures were measured by inserting standard thermocouples through the coolant (oil) hole of TiAlN-coated carbide drills. Experimental parameters used in the study has based on Taguchi’s method. Experimental study was conducted by using two different workpiece materials, AISI 1040 steel and Al 7075-T651. The drill bit temperature was predicted using a numerical calculation with Third Wave AdvantEdge^TM Lagrangian based on explicit finite element analysis software. The results obtained from experimental study and finite element analyses (FEA) were compared. Good agreement between the measured and analyzed temperature results was found in dry drilling process.     

亚临界热处理对40SiMnCrNiMo高强度钎钢组织和性能的影响

为简化40SiMnCrNiMo钢钎具的热处理工艺，试验了880℃30min油冷＋600℃60min空冷的调质处理，860℃30min空冷的正火和780℃30min空冷的两相区亚临界热处理后钢的组织和性能。结果表明，亚临界热处理后钢中贝氏体区HV显微硬度值低于正火钢，钢的V-型冲击功为30J，高于正火后钢V-型冲击功（12J），接近调质后的V-型冲击功（40J）。钎杆寿命试验得出，正火钢钎具平均钻孔进尺10．78m，亚临界热处理钢钎具平均钻孔进尺108．30m，可满足使用要求和替代调质处理钎杆。     

G105钻杆腐蚀失效分析

采用金相分析并结合X射线衍射、扫描电镜和电子探针能谱分析等方法，分析了某油田G105钻杆的腐蚀失效原因。结果表明，因腐蚀产物脱落造成井下堵水眼事故，而钻杆停钻后因未及时清理泥浆而造成钻杆内表面附着泥浆，含有氯离子的泥浆加速了其对钻杆的氧腐蚀。就停钻腐蚀问题提出了预防措施。     

4145H质量保证能力分析与研究

结合我厂4145H钴铤钢生产、检验实际情况以及近两年外事质量异议的特点，针对4145H钻铤钢的质量保证能力进行了细致的分析和研究，并从提高市场竞争力的角度出发提出了相应的改进措施，为生产和经营管理者提供某些参考。     

转炉试制超低硫低磷钻杆用钢的研究

为了满足塔里木油田对高韧性钻杆的需求,宝钢试制超低硫低磷钻杆用钢.试验表明,采用合适的冶炼工艺,大型转炉加炉外精炼能够批量生产超低硫低磷钻杆用钢,使钻杆获得高横向冲击韧性.