关于丝锥槽铣刀的若干问题

<正> 一、丝锥的沟形攻丝过程对丝锥容屑槽的要求比一般刀具高,主要有以下几点: 1.要有足够的容屑空间。对盲孔攻丝尤为重要,因为此时直沟丝锥要能容纳下全部切屑。2.要使切屑在切削过程中能较好地形成,防止丝锥和工件间发生切屑粘附、阻塞。     

螺旋槽丝锥槽型参数优化及其攻丝过程分析

介绍了螺旋槽丝锥的结构特点以及槽型的设计要求。基于CNC螺旋槽磨沟机与SP2000轮廓仪设计了3组丝锥槽型结构参数,对304L不锈钢材料进行了切削性能试验研究。结果表明:优化后的三圆弧槽型中M-1槽型丝锥的扭矩值较小,磨损量较低且切屑形态良好,保证了丝锥的芯部强度,提高了其使用寿命。     

丝锥槽形的改进设计

青海工具厂在丝锥生产过程中,发现旧的丝锥槽形存在问题。本文介绍了该厂丝锥槽形改进的经验及其计算公式。并对部分新槽形丝锥与旧槽形丝锥作了切削性能对比试验。试验表明,新槽形丝锥控屑性能好,无切屑堵塞和崩刃现象,并且耐用度有所提高,螺纹表面无刮伤。     

螺旋槽丝锥的有限元分析及其结构设计

针对螺旋槽丝锥在制造时存在的某些技术问题,建立丝锥攻丝时的力学模型,以攻丝扭矩最小为目标对螺旋槽丝锥几何参数进行优化设计,并对已优化设计的螺旋槽丝锥进行有限元分析,得到了最佳结构。     

螺尖丝锥槽型几何参数对攻丝的影响

螺尖丝锥具有切削锋利、加工效率高和被加工螺纹精度高等优点,广泛应用于各种条件下通孔内螺纹的加工,但在加工中易出现切屑松散和攻丝扭矩大等问题。研究螺尖丝锥槽型参数改变对攻丝扭矩和切屑形态的影响,在丝锥螺尖槽选择两段圆弧的前提下,通过改变圆弧半径来获得理想的丝锥槽型参数和切屑形态。结果表明:螺尖槽后R圆弧对攻丝有重要影响,R圆弧半径由小到大增加,攻丝扭矩呈由大变小再变大的趋势,切屑形态呈现由碎屑到卷曲紧密的完整切屑变化趋势。     

改变丝锥容屑槽槽数合理选用螺纹底孔直径提高丝锥强度

本文从丝锥在攻丝过程中。经常出现的丝锥折断、崩牙、切削厚度过大等问题．提出了如何合理选用螺纹底孔直径。改变丝锥容屑槽槽数两个主要关键方面来提高丝锥的攻丝承载能力．增大丝锥的抗扭矩力，应用效果十分明显。     

右螺旋槽丝锥

这种右螺旋槽丝锥,经过一年多的生产实践证明,适于对韧性大、塑性大、强度高材料的盲孔和深孔进行攻丝。用普通直槽丝锥加工韧性大的不锈钢、合金结构钢、低碳钢和紫铜等材料,往往出现以下问题: 1.由于普通直槽丝锥排屑效果差,切屑堵在丝锥排屑槽里,尤其是小直径丝锥很容易出现崩刃和折断现象。 2.由于切屑阻塞,攻丝过程中,冷却润滑效果较差,丝锥切削部分的     

右螺旋槽丝锥

这种右螺旋槽丝锥,经过一年多的生产实践证明,适于对韧性大、塑性大、强度高材料的盲孔和深孔进行攻丝。用普通直槽丝锥加工韧性大的不锈钢、合金结构钢、低碳钢和紫铜等材料,往往出现以下问题:1.由于普通直槽丝锥排屑效果差,切屑堵在丝锥排屑槽里,尤其是小     

导柱螺旋槽丝锥的设计及工艺方法

导柱螺旋槽丝锥与普通丝锥不同之处在于其带有导柱及螺旋式容屑槽,使其在使用中具有独特的优势,排屑顺畅,加工出的螺纹孔位置度和垂直度较高。本文着重论述了导柱螺旋槽丝锥的设计方法及加工工艺过程。     

磨削加工螺旋槽丝锥的金刚石滚轮

磨削加工螺旋槽丝锥的金刚石滚轮天津异型刃具厂（３００２１０）尹文义众所周知，现代机床和机构中有６％以上的零件带有螺孔。用丝锥加工深盲孔及难加工材料金属件上的螺孔是一个相当复杂的工艺课题，在加工高精度螺孔时尤为突出。而螺旋槽丝锥使切屑呈螺旋状连续排出，...     

螺尖丝锥的切削性能分析

介绍了螺尖丝锥的结构特点,并在螺尖丝锥产品设计制造过程中,对丝锥关键几何结构参数进行优化设计,基于德国勇克机床Juwop/W槽形模拟软件,对螺尖槽形进行模拟。通过切削试验进行对比分析。试验结果表明:螺尖丝锥比机用丝锥更加适合于高速切削,在切削过程中更加稳定,切削性能更加优越。在高速切削时,高性能螺尖丝锥比普通螺尖丝锥更加耐磨损,使用寿命更长。     

基于AutoCAD的丝锥容屑槽槽形画法

论述了用AutoCAD绘图命令画丝锥沟槽形状的方法,比以往利用计算、推导坐标方法及利用AutoLISP程序绘图更简单方便。     

Novel micro-deep-hole drill with variable web thickness and flute width

This study proposes a novel micro-deep-hole drill with variable web thickness and flute width to effectively improve the problem of tool breakage and chip clogging during micro-deep-hole drilling. Firstly, the failure form and failure mechanism of micro-drill are explored by performing drilling experiments, and it is found that the torsion fracture and bending fracture are the main premature failure modes of micro-deep-hole drilling tools. The static simulation analysis of micro-drill is further conducted to investigate the influence of geometric parameters on the stiffness and strength of high-aspect-ratio micro-drill, and the results indicate that the web thickness ratio and flute width have significant effects on drill tip stiffness and spiral groove root strength. To balance the rigidity, strength and chip evacuation capability of micro-deep-hole drilling tools, the new micro-drill with variable web thickness and flute width is developed, supplemented by comparative experiments. The results confirm that the new micro-drill has better chip removal ability, greatly reduces the drilling force, torque, drill tip wear and material peeling phenomenon, and significantly enhances the machining quality of hole wall.     

液压元件螺纹垂直度数控加工工艺方法研究

为提高液压系统阀块、油路块等液压元件的螺纹垂直度,提高螺纹加工效率,提出了采用直槽丝锥的柔性攻丝加工方案和采用螺旋槽丝锥的刚性攻丝加工方案,并对2种螺纹数控加工工艺进行加工分析。通过在立式加工中心上对不同规格螺纹进行柔性/刚性攻丝试验来验证加工分析的准确性。试验结果表明,柔性攻丝加工的螺纹表面粗糙度差且加工效率低,而刚性攻丝加工的螺纹表面粗糙度良好,且螺纹轴线与其端面垂直度均小于0.02 mm,满足产品要求。     

A GEOMETRIC ANALYSIS OF SEMI-SPIRAL CHIP MORPHOLOGY IN ORTHOGONAL MACHINING

Continuous, unbroken chips used to be a significant manufacturing problem, creating a hazardous situation for the operator and endangering the machine tool. This problem, however, is now largely solved. At this point, further work is needed to optimize well-broken chips. Once chip initial curl and spiral characteristics can be predicted, they can be optimized as part of the overall cutting process design. This may decrease the need for cutting fluids to flush the chips from the cutting region, thereby facilitating a more environmentally conscious process design. Analytic and experimental work is performed to investigate chip spiral morphology and develop a predictive orthogonal chip model. The analytic semi-spiral chip prediction model of Cook et al., [1] is extended to the constricted envelope case. Numerically developed chips are created to investigate the effects of generalized obstruction geometry. The process inputs that have statistically significant effects on chip morphology are determined to confirm the model.     

螺旋槽丝锥沟槽铣刀廓形的设计计算

介绍了螺旋槽丝锥沟槽铣刀廓形的设计计算方法,分析了螺旋槽加工中的铣削干涉及判别方法。     

OPTIMIZATION STUDIES ON HOLE-MAKING TOOLS FOR HIGH-PERFORMANCE CUTTING AUSTENITIC STAINLESS STEEL

Austenitic stainless steel is a kind of difficult-to-cut material utilized widely in various industry fields. Hole-making tools are the uppermost obstacle of high performance cutting, so the optimizations of tools are imperative. This paper presents respectively the optimal geometrical characteristics and corresponding coating for high performance cutting austenitic stainless steel. The appreciated cutting performance of optimized tools with optimized cutting parameters has also been evaluated completely through experiments. Optimized special drills with point angle 138° and helix angle 38° was decided and TiCN coating was selected as the best coating. However optimized taps had different geometry structures for tapping through holes and blind holes. The former adopted the spiral pointed tap with inclination angle 15 °. The latter was spiral fluted tap with helix angle 34°. In high-performance cutting austenitic stainless steel, the optimized cutting parameters of special drills are 16 m/min and 0.13 mm/rev. The research results will be of great benefit for the development and application of high efficient and precise drills and taps of high performance cutting austenitic stainless steel.     

螺旋槽丝锥切削模型建立及切削过程模拟

建立了螺旋槽丝锥模型并利用DEFORM-3D有限元软件模拟丝锥的攻丝过程,将模拟得到的切削力与试验测量的切削力进行对比,证明该丝锥模型可以用来模拟丝锥攻丝过程的受力状况。用该丝锥模型研究了切削速度对切削力的影响,结果表明:随着丝锥转速的提高,切削扭矩先减小后增大,在转速为200r/min时扭矩最小。