利用宏程序去除缸筒矩形螺纹毛刺的实践与应用

加工液压支架中缸筒和导向套之间的矩形螺纹时,会在螺纹前端及后端出现尖角毛刺。编写去螺纹前端及后端毛刺的数控宏程序,在数控机床上直接去除了螺纹尖角毛刺,减轻了劳动强度,提高了螺纹加工质量和加工效率。     

数控车加工中螺纹倒角处毛刺的去除方法分析

数控车加工螺纹过程中,在螺纹倒角处易产生毛刺,这与被加工工件的材质、刀具的材料、进刀策略等都有一定关系.文中通过案例分析,改变传统加工螺纹的工艺路线,达到了去除螺纹倒角处毛刺的目的,进而起到倒角的作用,也使得加工零件更美观.     

如何运用数控车床去除螺纹扣头扣尾毛刺

运用数控车床加工螺纹质量稳定，生产效率高。但是在螺纹车削完成后，螺纹扣头扣尾产生的毛刺难以通过数控车床去除，仍然要使用卧式车床去除毛刺，这不仅延长了产品的生产周期，占用了加工设备，还使数控机床的优势无法得到充分发挥。为了解决这一难题，笔者进行了反复研究、试验，最终通过调整走刀路线，自磨加工刀具，实现了在数控螺纹加工的同时有效去除毛刺，避免了后续的补充加工。     

油井管用特殊螺纹接头关键技术分析

介绍了国内外油井管特殊螺纹接头发展现状,对特殊螺纹接头的联接螺纹、密封面和抗过扭台肩3部分的结构和功能进行了分析,指出了研发时遵循的设计准则,提出了设计特殊螺纹接头时的具体过程和注意事项,为今后的研发奠定了基础。     

热能去毛刺

零件在机械加工过程中产生的毛刺,往往需要大量的手工劳动才能去除。效率低,而且不经济。此外,某些结构复杂和具有深的小孔、交叉孔及螺纹孔等的零件,往往有些毛刺看不见,或无法去除,影响了产品质量。氢、氧气体爆燃去毛刺,即热能去毛刺,便能有效地解决这个向题。热能去毛刺的原理     

间断螺纹上毛刺的去除

如图1所示工件,在M25×1.5螺纹上铣六条花键,这样键侧的螺纹上就产生毛刺,周小锉刀修锉工效太低,用M25×1.5板牙复套,不但损份螺纹表面,而且板牙的短切削刃很容易从螺纹的断开处脱滑。     

M4以下小内螺纹的加工方法分析

在M4以下的高精密小螺纹加工过程中,易于出现断丝锥、螺纹孔底部堆积切屑、螺纹牙尖毛刺。文中分别对比分析挤压攻丝、切削攻丝和铣削螺纹等3种加工方式的优点和缺点,在加工细节上提高螺纹质量。     

AP1000核电站蒸汽发生器上部支承耳板螺栓卡涩问题分析

本文从超长旋合螺纹的检测、内螺纹的加工工艺、内螺纹毛刺清理等方面详细阐述了AP1000蒸汽发生器上部支承耳板螺栓卡涩问题产生的原因,并提出了切实可行的改进方案,避免了后续类似超长旋合长度的螺纹制造加工、检测。     

钻孔去毛刺夹具

过去在钻削齿轮轴端细牙螺纹上的横孔时,采用如下工艺:①钻模钻孔②用标准细牙圆板牙虫除因钻孔而产生在螺纹牙间的毛刺。加工一个零件,需两次装夹,故效率较低。为解决此问题,我设计了如图1、图2所示的钻     

车削丝杠控制齿顶毛刺的方法

用硬质合金刀具高速车削丝杠,不仅生产效率高,而且在刀具几何参数、切削用量和辅助措施(如使用跟刀架等)的合理选择下,能保证工件具有一定的精度和光洁度。但是,在高速挑扣过程中,由于受到工件截形的限制,刀具前角较小,吃刀深度较大,则在刀具挤压下,螺纹齿顶转角处会产生较大的毛刺(以下称为齿顶毛刺)。对刚性较强的短丝杠,一般不加跟刀架,可在精车前增加一次走刀,将毛刺去除。对刚性较差的长丝杠,齿顶毛刺的存在,     

Non-contact inspection of internal threads of machined parts

During the manufacturing process of mass-produced automotive parts, millions of internal threads are produced annually by each automaker. The manufacturers invest a lot of effort and resources to improve the quality of the threads by inspecting their features, mainly by using manual contact gages. The majority of manufactured threads are used in threaded joints that assemble two mechanical parts. However, there are threads that have additional functionality, for example, an automotive spark plug. Recently, automotive designers have found that the angular direction of the spark plug inside the combustion chamber affects the efficiency of the engine. Hence, the manufacturers are interested in measuring the exact position of the thread starting point, allowing them to position the plug in the right direction during the plug assembly process. Our technique allows precise measurement of the thread starting point and meets this requirement. In order to improve the quality of internal threads, it is essential to measure the threads dimensional features. It is also important to inspect its internal surface for defects such as the existence of burrs, thread discontinuities, or internal porosity defects. The paper introduces two novel non-contact electro-optical techniques for inspecting small-size internal threads. The first one enables in-process internal thread geometrical measurements using a high-precision laser sensor which utilizes a motorized periscope. The second technique is based on image processing and uses innovative machine vision; a line-scan technique which uses a CCD camera with a “sight pipe” panoramic optical device. The two methods are complementary; together they allow the practical inspection of all needed features of the internal thread. The methods were tested successfully.     

金属切削毛刺数据库系统的设计

毛刺的产生和存在是金属切削加工中普遍存在的问题 ,它直接影响了工件的加工精度及质量。基于数据库和Java ,研究了金属切削毛刺数据库系统的设计 ,实现了切削毛刺数据的管理、切削毛刺类型与尺寸大小及加工参数的查询 ,进一步丰富和完善了金属切削毛刺的预报与控制理论。     

旋转锉四坐标数控刃磨技术的研究

在天津大学研制的五坐标旋转锉刃磨机床的基础上 ,研究了旋转锉的四坐标数控刃磨技术。首先分析了四坐标数控刃磨旋转锉的可行性 ,然后通过运动分析建立了旋转锉的刃磨运动模型 ,最后通过多坐标联动控制实现旋转锉的实际刃磨     

二维切削中切削方向毛刺与亏缺的界限转换条件

建立了二维切削中切削方向毛刺与亏的生成模型,给出了切削方向毛刺与亏缺的判别准则,并对影响切削方向毛刺与亏缺转换的主要因素进行了实验研究和相应的理论分析,提示出切削方向毛刺与亏缺的界限转换条件为：剪切应变ε≤3,为亏缺;3＜ε＜4,为过渡区;ε＞4,为毛刺。并且,切削方向毛刺与亏缺的界限转换条件因切削条件变化而变化。为进一步深入研究切削毛刺的生成与抑制理论提供了科学的基础。     

金属切削毛刺分类体系的研究及其应用

将金属切削毛刺生成同切削运动联系起来，提出并建立起切削运动－刀具切削刃毛刺分类体系，清晰地给出影响毛刺生成及变化的主要因素。将该分类体系应用于车削、钻削和磨削加工，表明切削运动－刀具切削刃毛刺分类体系定义明确、完整。简便易行。     

少无毛刺切削技术的研究进展

在系统概述国内外少无毛刺切削加工技术研究进展的基础上,根据机械加工实际需要,给出了主动控制或减小金属切削毛刺的基本原则,探索出少无毛刺的主要途径。此外,分析了几种切削加工技术的具体应用。指出了目前尚需解决的一些主要问题,确立了今后深入开展金属切削毛刺研究的方向。     

Defining the effects of cutting parameters on burr formation and minimization in ultra-precision grooving of amorphous alloy

Amorphous nickel phosphorus (Ni-P) alloy is a suitable mold material for fabricating micropatterns on optical elements for enhancing their performances. Ultra-precision cutting is preferred to be used to machine the mold material for high precision in a large workpiece. However, burrs and chippings always form and are detrimental especially when fabricating micropatterns. The formation mechanisms of burrs and chippings have not yet been revealed precisely in the cutting processes of amorphous alloys, because their cutting behavior is more complex and less discussed in existing researches than that of crystalline metals. In the present study, the burr formation process of amorphous Ni-P is defined and a three-dimensional cutting model using energy method is proposed to predict and minimize burrs and chippings. Microgrooving experiments were conducted with different undeformed chip geometries using three types of cutting tools to observe burr formation processes. Large burrs and chippings were formed when cutting with a tapered square tool and a tilted triangle tool. These large burrs and chippings were found to be induced by large slippages that are unique to amorphous alloys. It was revealed that burrs and chippings appear when the angle between the chip flow direction and the groove edge is less than a critical value. Energy method was used to predict the chip flow directions and the calculated results agree with the experimental ones, which proved that the energy method is valid for designing an appropriate undeformed chip geometry to reduce burrs and chippings in ultra-precision grooving.     

基于IPC的旋转锉数控刃磨系统的开发

根据旋转锉刃磨运动模型和刃磨机床结构 ,开发了基于IPC的旋转锉数控刃磨系统。该系统使用IPC机—运动控制器—驱动器—步进电机 ,控制机床各轴运动 ,并主要通过软件进行多坐标插补 ,实现旋转锉数控刃磨加工     

柴油机零部件加工毛刺产生的因素及其对策分析

对柴油机零部件加工毛刺进行了分类,分析了影响柴油机零部件加工毛刺产生的因素,并对柴油机零部件加工毛刺的控制进行了策略分析.     

Burr formation in milling cross-connected microchannels with a thin slotting cutter

This paper studies the burr formation mechanism in milling cross-connected microchannels, and investigates the influences of radial depth of cut a_e, cutting speed v, feed speed vf and mesh size on the burr formation. A thin slotting cutter is carried out to fabricate cross-connected microchannels in a metal plate of thickness H. Two kinds of large burrs are produced in the meshes formed by two sets of perpendicular and cross-connected microchannels: flake-like burr and curl-like burr. Results indicate that when a_e is equal to or slightly larger than H/2, flake-like burrs are formed. When a_e is much larger than H/2, curl-like burrs are produced. Furthermore, curl-like burrs formed at low v are relatively longer than those formed at high v. High vf is unfavorable for the occurrence of long curl-like burrs. In addition, larger mesh is in favor of longer burrs due to its larger capacity.