双刀快速轮切蜗杆螺纹

的新工艺,效果很好。一、加工方法蜗杆螺纹和梯形螺纹目前常用的粗车切削方法有:左右切削法、片切式切削法、阶梯式切削法和分层切削法等,这些切削方法都不够理想。为此,我们革新成功硬质合金螺纹车刀双刀轮切蜗杆螺纹     

尝试内锥螺纹的数控加工

介绍正规式钻杆接头75／8″左旋内锥螺纹的两种程序编制方法,即切削螺纹(G32)和螺纹切削固定循环(G82)的程序编制,完成了对75／8″左旋内螺纹的一次性完整挑扣加工,探索出左旋内锥螺纹加工的一条新途径和新方法。     

数控车床螺纹加工编程指令的应用

在目前的FANUC和广州数控系统的车床上,加工螺纹一般可采用3种方法：G32直进式切削方法、G92直进式固定循环切削方法和G76斜进式复合固定循环切削方法。由于它们的切削方式和编程方法不同,造成的加工误差也不同,在操作使用时需仔细分析,以便加工出高精度的零件。     

数控车床螺纹切削方法的灵活应用

在目前的数控车床中(FANUC数控系统)，等距螺纹的车削一般有3种方法：G32直进式切削方法、G92直进式固定循环切削方法、G76斜进式复合循环切削方法。因为它们的切削方式及编程方法不同，所以，在选用它们的时候也存在着差异。     

数控机床螺纹切削方法分析与应用

在目前的数控机床中,螺纹切削一般有两种加工方法:G32直进式切削办法和G76斜进式切削方法,由于切削方法的不同,编程方法不同,造成加工误差也不同。我们在操作使用上要仔细分析,争取加工出精度高的零件。 1.两种加工方法的编程指令 1:G32 X(U)____Z(W)____F____;     

宏程序在梯形螺纹参数化编程中的应用

1.梯形螺纹切削方法的分析梯形螺纹的车削方法分低速和高速切削两种,对精度要求较高的梯形螺纹以及单件生产时,低速切削应用较多。传统的低速切削螺纹的方法有直进法（见如图1a）、斜进法（见图1b）、左右车削法（见图1c）     

行星旋风铣削内螺纹

旋风切削螺纹是加工螺纹的有效方法之一,它具有一定的特点和应用范围,本文所介绍的是在普通机床上,加装旋削装置,切削内螺纹。一、行星式旋风头行星式旋风头如图1,安装于车床主轴端,除刀杆自转外,它还围绕着车床主轴公转。它主要由皮带轮、主轴、轴承、隔圈、偏心法兰盘等零件组装而成。     

双联式丝锥

介绍了一种切削通孔螺纹的单支双联式丝锥。经实际使用表明,该种丝锥的使用效果较好,螺纹的精度可达5H～6H,螺纹表面粗糙度值为Rz25～12.5。     

三角形螺纹在数控车床上的加工及分析

介绍了FANUC系统中数控车床切削螺纹时的进刀方法、切削指令的格式及其参数的含义,结合具体实例介绍了各种三角形螺纹的切削程序,并对各个指令的优缺点进行分析,对螺纹切削时指令的选择和参数的设定提供了参考方案。     

数控车床螺纹加工编程技巧二则

对于螺纹加工,数控系统一般都提供了等导程螺纹切削指令G32、螺纹切削固定循环G92和螺纹切削宏指令G76。这些指令的编程格式及使用方法在有关书籍当中都有详细讲解,本文不再赘述。以下是笔者在实践中总结出来的螺纹加工的编程技巧,现予介绍。     

基于GSK980TD系统车削梯形螺纹的应用研究

梯形螺纹在数控车床上,尤其是在经济型数控车床上的加工存在扎刀现象,是比较难解决的问题。利用GSK980TD系统提供的宏功能解决了梯形螺纹编程困难的问题,为各种直径和螺距的梯形螺纹加工编制了通用的数控车削程序。在程序中巧妙地结合了普通车床车削梯形螺纹时应用的各种工艺技巧,采用分层切削、螺纹切削粗、精加工分段降低牙侧的表面粗糙度,为数控车削梯形螺纹提供了一个实用合理的加工程序。     

切削用量对铣削非标内螺纹刀具磨损的影响

与传统螺纹加工方法相比,铣削螺纹不仅具有较高的加工精度和加工效率,而且不受螺纹结构的制约,可较为自由地选取合理的加工参数。应用DEFORM-3D软件对铣削非标内螺纹刀具磨损进行仿真,运用正交仿真试验研究切削速度、最大切削厚度和径向切削深度等切削用量对刀具磨损的影响,并对加工参数进行了优化。结果表明:切削刃圆角处刀具磨损最严重,在研究范围内,径向切削深度对刀具磨损的影响最大。     

大螺距螺纹刀具刃磨技巧

在钢铁企业的备件加工中需要的大螺距螺纹的加工件特别多且应用广,但大螺距螺纹螺距大、牙型槽宽且深,对刀具强度、粗糙度、形状精度、锋利程度要求较高。刀具刃磨的好与差直接影响加工后螺纹表面光洁度、尺寸精度及加工效率。本文介绍总结了一套科学、简单、实用的大螺距螺纹刀具刃磨技巧,正确运用能提高螺纹的光洁度,保证尺寸精度,提高生产效率。     

PREDICTION AND EXPERIMENTAL ANALYSIS OF CUTTING FORCES DURING MACHINING OF PRECISION EXTERNAL THREADS

External thread cutting is a complex 3-D process in which the cutting conditions vary over the thread cutter profile. It is accepted as a mature; however, heavily experience based technology and there are few academic work published. Determining the cutting forces during machining is crucial to explain formation of the surface layer, residual stresses, selection of the most appropriate machine tool and optimizing the process. This investigation is an attempt to predict thread cutting forces by dividing the thread chip into three parts, one thread root and two side faces. Variation of the cutting parameters including the shear angle, mean cutting temperature and friction force on the flank face of the tool along the thread tool root and sides are determined. In the thread root and sides, chip compression ratios for the V-shaped single piece and separately cut chip zones are measured and cutting forces are calculated and compared for precision metric thread cutting on a SAE 4340 steel bar.     

经济型数控车床车削螺纹理论和试验研究

本文介绍了用经济型数控车床车削汽车制动阀螺纹零件切削用量、刀具参数对加工精度的影响，试验研究了合适的切削用量和刀具参数。     

大螺距梯形螺纹的加工

本文主要以XX产品上大螺距梯形螺纹(图1)的加工为例,叙述了大螺距梯形螺纹加工中切削进给方式和切削用量选择原则,分析了影响大螺距梯形螺纹加工质量的因素,提出了提高大螺距梯形螺纹加工质量的措施。     

471型管端车丝机外圆加工刀具的改进

为解决 471型管端车丝机加工石油套管时管端螺纹锥度不规则变化的问题 ,对外圆加工刀具几何参数作了合理改进 ,从而减小了外圆加工时钢管所受径向切削力 ,保证了管端螺纹锥度的精度稳定性     

CA6140车床加工三线螺纹的研究

介绍了CA6140车床在加工三线螺纹时选配挂轮的方法,分别针对加工公制螺纹、模数制螺纹、英制螺纹和径节制螺纹的情况进行介绍。采用非常简单的选配方法来解决加工非标导程的三线螺纹困难的问题,以满足实际生产中对于常用三线螺纹的加工。     

Identifying bifurcation behavior during machining process for an irregular milling tool geometry

High-productivity machining processes cause tool and material defects and even damages in machine spindles. The onset of self-excited vibration, known as chatter, limits this high material removal rate. This chatter vibration refers to machining instability during cutting processes, which results in bifurcation behavior or nonlinear effect wherein the tool and the workpiece are not engaged with each other. In particular, bifurcation for low-radial immersion conditions can be easily promoted and identified. In this study, an experiment on an irregular milling tool as a variable helix and variable pitch geometry was conducted under a flexible workpiece condition. The bifurcation behavior from regenerative chatter was identified and quantified from displacement sensor and inductive sensor measurements. A series of cutting tests was used to measure the vibration signals, which were then analyzed based on the frequency spectrum, the one-per-revolution effect, and the Poincaré section. According to results, Hopf bifurcation and period-one bifurcation instabilities apparently occurred to validate chatter stability prediction through a semi-discretization method. However, period-doubling bifurcation was only determined during the unstable cutting of a uniform tool that was not in variable helix/pitch or an irregular milling tool. An irregular tool geometry caused the modulation of the regenerative effect to suppress chatter, and period-doubling instability could not be exhibited during cutting as a regular tool behavior. This period-one chatter instability of an irregular milling tool should be identified and avoided by practitioners to achieve high productivity in machining using the aforementioned irregular milling tools.     

基于55°密封管螺纹的锥螺纹数控加工研究

通过对我国管螺纹现行标准、作用、工艺及功能特点的详细介绍,探讨了以数控加工的方式进行55°密封管螺纹的圆锥外螺纹的加工思路、工艺参数选择及程序编制。通过对55°密封管螺纹的数控加工工艺的研究发现,数控加工管螺纹不但可以提高加工精度及加工效率,而且在切削过程中选择适当的切削用量,可以较好地保证加工质量。