Ball screws are the driving components used to convert rotational motion into linear in precision equipment. However, machining accuracy of equipment is directly determined by positioning ball screw. The authors analyze sustainability preload double-nut with raceway wear. A new wear model combining modified Archard theory and iterative interpolation method established variations depth. considering coupling relationship between loss proposed study life In addition, a novel running test bench...

The accurate model of the load state for all balls under multidirectional is very helpful design process ball screws. contact deformation screw without consideration stress difference inaccurate. In this paper, a novel established by considering coupled axial, radial to study elastic displacement and position accuracy. deviation variation axial with dimension errors are investigated obtain influence on precision sustainability screw. including travel distribution studied different...

Ball screw is the driving functional component most frequently used for precision equipment. To a certain extent, transmission accuracy of equipment affected by position error ball caused elastic–plastic deformation between and raceway under overload impact. This article aims to investigate loss considering short-time A novel model combining Hertzian Thornton contact theories established describe variations in axial depths. Thus, can be defined as differential value initial no-loading travel...

In high-speed/high-precision ball screw transmitting systems, the re-circulating mechanism of screws is used for providing path steel balls rolling in grooves generally. Forces caused by impact activity between and has resulted a series troublesome problems, such as violent vibration, strong noise, etc.. order to investigate impact-contact mechanism, multibody dynamics model proposed using ADAMS C++ language. And simulation result validated comparing obtained from test calculated result. The...

Roller linear guides are key components in machine tool. The accuracy and efficiency of a toll determined by the stiffness friction torque roller guide. This study proposes an improved design method for influences rollers profile on stiffness, stress distribution guide analyzed using finite element simulation. In this work, roller, slider, overall structure is modified. Moreover, experimental investigations noise sliding compared to validate proposed method. It seems that can improve...

Purpose This paper aims to provide thermal elastohydrodynamic lubrication (TEHL) contact model study all balls’ performance of the ball screw when multidirectional load is applied. Design/methodology/approach A new TEHL combining and roughness surface texture established describe fatigue life screw. Meanwhile, authors use Reynolds equation Findings When applied, load, slide-roll ratio entrainment velocity balls have a periodic shape. The values at ball-screw points including stress, shear...

The axial vibration of precision ball screw mechanism is the major factor on its positioning accuracy and noise. Many factors were contributory to vibration, which includes waviness balls groove, friction between moving foreign substance in rollaway nest impulse during entering exiting return etc. In this paper, experiments pairs type CD4020x1200 performed with different speeds. test result revealed that caused by a periodically invigorative varying rotating speed. Moreover, few are...

Ball screws are the driving functional components most frequently used for machining equipments. However, precision positioning error of ball decide directly accuracy machine tools. This paper aims to investigate loss screw considering full load distribution. The raceway wear model is built predict in different structural parameters and operating parameters. Meanwhile, rate obtained analyzed during whole running life.

Contact stress analysis on the high-speed double-nut ball screw has been done, contact deformation derived, and we got formulas of axial stiffness screws, then some main factors which could influence such as preload, helix angle, angle ,etc.Then screws caused by these corresponding related curves, can provide theoretical support for reasonable design new screws.

The raceway profile greatly influences the performance of a ball screw. Although traditional circular is simple in structure, it can be limitation to load carrying capacity screws. In this paper, novel type screw proposed based on geometrical close contact theory. Firstly, second-order approximation curve derived using McLaughlin formula normal plane helix, which serves as basis for constructing profile. mathematical expression stress distribution then obtained Chebyshev polynomials. A...

Taking into account the influence of error in contact points balls and groove on force, manufacturing errors grooves friction torque was analyzed. The view that ball screw mechanism affect value averagely brought forward. characteristic fiction three type screws included inner-return type, return pipe end cap investigated through test. lubrication stabilization also tests. It found fluctuation at normal frequency 1 Hz could be eliminated completely when is lubricated by grease. Analysis...

摘要: 针对以往研究中滚珠丝杠副摩擦力矩计算方法中未考虑润滑作用对其影响,或未考虑接触弹性滞后效应以及滑移摩擦效应对其影响的情况。首先基于单个滚珠接触效应建立其热弹流润滑方程;然后在考虑润滑效应的基础上建立其黏性摩擦力、弹性滞后摩擦力及滑移摩擦力方程;最后提出一种基于全滚珠载荷分布与热弹流润滑耦合的滚珠丝杠副摩擦力矩计算模型,建立了预紧力、转速与摩擦力矩之间的耦合关系。试验结果表明,当预紧力从1 kN变化到6 kN,在滚珠丝杠低转速(100 r/min)时,摩擦因数变化范围为0.005 6~0.006 5。随转速的提髙摩擦因数升高且变化量逐渐增大,说明国际标准DIN ISO3408-3:2006中将滚珠丝杠副空载摩擦力矩测量速度定为100 r/min具有合理性,验证了所提出的摩擦力矩计算方法的准确性。

In high-speed/high-precision ball screw transmitting systems, the re-circulating mechanism of screws is used for providing path steel balls rolling in grooves generally. Because rotating speed driven shaft has become higher and higher, forces caused by impact activity between resulted a series troublesome problems, such as violent vibration, strong noise, damage to recirculating after some significant service times, etc. order reduce impact, novel method using elastic joint nut proposed...

Ball screw has the advantages of high precision, efficiency, stiffness and smooth operation, so it been widely used in automotive industry, semiconductor, aerospace, medical other fields. It is significant to research lubrication theory ball its influence on friction torque improve life. In complex working conditions screw, elastohydrodynamic performance greatly influenced by thermal effect, lubricating oil will no longer be Newtonian fluid under coupling action temperature pressure....

The re-circulating mechanism of ball screws plays a vital role for its providing the path steel balls rolling in screw grooves generally high-speed/high-precision transmitting systems. However it is very hard to directly measure ball's motion re-circulation closed recirculation groove. In order investigate impact-contact between and mechanism, multibody dynamics model by using ADAMS used simulate balls/re-circulating contact-impact behavior mechanism. simulation, general elastic contact was...

Combined with a measurement example, the framework of Object-oriented Flexible Measurement System (OFMS) is described in detail this paper. The OFMS adequately takes advantage object-oriented technique computer software, and realized hardware software. As result, it leads trend to integration. emphases are on encapsulation, inheritance, flexible-construction multi-task options. concept, software system, anti-disturbing measurement, error source measuring process studied Its construction...

复合载荷下滚珠丝杠副全滚珠载荷

Abstract The ball screw (BS) has become an indispensable key functional component in many fields, such as CNC machine tools, precision transmission system and special service requirements. Its accuracy reliability is a performance application fields. There phenomenon of mixed slip-roll motion during the BS operation, however, both non-constant working conditions sliding-rolling mode affect its decay. In this paper, modeling method decay for behavior established under operating conditions....