Purpose

The nonlinear friction disturbance of the moving joint surface of the feed system can lead to the residual vibration of the system, prolong the stability time of the system and reduce the motion precision and machining precision of the machine tool. This paper aims to concern the vibration between joint surfaces caused by nonlinear friction.

Design/methodology/approach

The model is established from the micro and macro scale based on the LuGre model. The friction characteristics of the moving joint surface are explored. The friction experiment of GCr15 pin and 45 steel disk is designed and the influence of lubrication condition, speed, acceleration and normal load on friction characteristics are studied.

Findings

Among the drive speed, damping and stiffness, the negative gradient effect of friction, which is characterized by the difference of static and dynamic friction coefficient Δµ, is the main cause of friction vibration between moving joint surfaces. Sufficient lubrication, a proper increase of speed and acceleration, a reasonable reduction of normal load can reduce the negative gradient effect, which can weaken the vibration caused by the nonlinear friction and improve the friction characteristics of the moving joint surface.

Originality/value

In the past studies, more attention has been paid to revealing the relationship between the relative speed and friction, while the acceleration is often ignored. The negative gradient effect of friction is improved in this paper by changing the contact conditions. Research findings of this paper effectively improve the friction characteristics of the moving interface and provide the basis for restraining the nonlinear vibration between the moving interfaces.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-11-2019-0476/

中文翻译：

---

从微观和宏观尺度看运动关节表面的摩擦特性

目的

进给系统活动关节表面的非线性摩擦干扰会导致系统残留振动，延长系统稳定时间并降低机床的运动精度和加工精度。本文旨在研究由非线性摩擦引起的接合面之间的振动。

设计/方法/方法

该模型是基于LuGre模型从微观和宏观尺度建立的。探索了活动关节表面的摩擦特性。设计了GCr15销钉和45钢盘的摩擦试验，研究了润滑条件，转速，加速度和法向载荷对摩擦特性的影响。

发现

间的驱动速度，阻尼和刚度，摩擦的负梯度的影响，其特征是静态和动态摩擦系数Δ的差μ是摩擦振动的移动关节表面之间的主要原因。充分润滑，适当增加速度和加速度，合理降低法向载荷可以减小负梯度效应，从而可以减弱非线性摩擦引起的振动并改善运动关节表面的摩擦特性。

创意/价值

在过去的研究中，人们更加重视揭示相对速度与摩擦力之间的关系，而加速度却常常被忽略。通过改变接触条件可以改善摩擦的负梯度效应。本文的研究成果有效地改善了运动界面的摩擦特性，为抑制运动界面之间的非线性振动提供了依据。

同行评审

本文的同行评审历史记录可在以下网址获得：https://publons.com/publon/10.1108/ILT-11-2019-0476/