Friction-reduced hydrodynamic sliding linear bearing with diminished inclination of tilting to increase the sliding velocity by means of optimal design of the sliding surfaces

高负载能力与出色的阻尼性能相结合是液压导轨（HDG）仍然用于机床的原因。通过对加工力进行阻尼，可实现工件的极高表面质量。HDG系统最好在流体摩擦区域内运行。该延续方案的目的是提高操作期间流体动力导轨的精度，即通过有目的地控制启动机构实现与时间和位置无关的恒定浮动行为。为此，要缩短的第一个方面是导向器Stribeck图中的混合摩擦区域，即以尽可能低的速度达到液体摩擦区域。精度特性的第二个方面是润滑间隙与流体摩擦的期望恒定性，即避免或最小化滑架的倾斜。第三个标准是浮动高度随速度增加的最小增加，这必须通过有目的地控制各种机构来确定。该目标遵循当前DFG项目，在该项目中，仅用定义的或实验确定的托架初始位置来描述恒速下的浮动行为。相反，机床典型的反向运动的速度曲线总是由3个阶段组成：加速，恒速和减速，这是永久重复的。从静止位置开始-即没有明显的润滑间隙-是一个例外，因为在单个冲程之间没有足够的时间将油从润滑间隙压出。以下挑战来自于该目标，其整体解决方案能够实现流体动力导向系统的有效设计和最佳操作：-改进润滑间隙中的流体动力压力和入口边缘处的位移压力的测量-启动过程的建模和控制-润滑参数的调制-接触表面的曲率的调节该方法是以特定的方式控制和塑造启动过程。为此，必须在从初始位置开始或在方向反转后掌握润滑楔的特性。这三个可调节的影响因素之间的相互依赖关系非常复杂：运动周期内的加速度曲线、润滑和接触表面的几何形状。工作方案为这些方面的每一个方面专门安排了一个行动方案。它是通过工作来完成的，以提高对启动的专业技术理解，特别是改善压力测量系统。

The high load capacities combined with excellent damping properties are the reasons why hydrodynamic guides (HDG) are still used in machine tools. A very high surface quality of the workpieces is achieved by damping the process forces. The HDG systems should preferably be operated in the area of fluid friction. The aim of the continuation proposal is to improve the accuracy of hydrodynamic guides during operation, i.e. constant floating behaviour independent of time and position through purposeful control of the start-up mechanisms. For this purpose, the first aspect to be shortened is the mixed friction area in the Stribeck diagram of the guide, i.e. the liquid friction area is reached at the lowest possible speed. The second aspect of the accuracy behaviour is the desired constance of the lubricating gap with fluid friction, i.e. the avoidance or minimisation of tilting of the carriage.The third criterion is the minimal increase in floating height with increasing speed, which must be determinable by the purposeful control of various mechanisms. The objective follows on from the current DFG project, in which the floating behaviour at constant speed was described only with a defined or experimentally determined initial position of the carriage. In contrast, the velocity profile of machine tools typical reversing movements always consists of 3 phases: Acceleration, constant speed and deceleration, which are in permanent repetition. Starting from the stillstand position - i.e. without a significant lubricating gap - is rather an exception, since there is not enough time between the single strokes for the oil to be pressed out of the lubricating gap. The following challenges arise from the objective, the solution of which in its entirety enables an effective design and optimal operation of the hydrodynamic guidance system:- Improvement of the measurement of hydrodynamic pressure in the lubrication gap and displacement pressure at the inlet edge- Modelling and control of the start-up process- Modulation of lubrication parameters- Adjustment of the concavity of the contact surfaceThe approach is to control and shape the start-up process in a specific way. For this purpose, the characteristics of the lubricating wedge must be mastered when starting from the initial position or after a reversal of direction. The interdependence of the three adjustable influences is particularly complex: the defined acceleration profile within the movement cycle, the lubrication and the geometry of the contact surface. The work programme dedicates one AP to each of these aspects. It is completed by work to improve the mathematical-technical understanding of the start-up and, in particular, to improve the pressure measurement system.