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Development of Half-floating Leadscrew and its application

半浮动丝杠的研制及其应用

基本信息

批准号：
12650140
负责人：
FUKADA Shigeo
金额：
$ 2.37万
依托单位：
Shinshu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

Sliding leadscrews have superior advantages of higher stiffness and vibration dumping effects than ball screws or hydrostatic leadscrews though they have disadvantage of large friction loss. This study proposes a method of improving the frictional property without deteriorating the advantage of stiffness and vibration dumping effects. Pneumaticpressure is supplied to contact interfacebetween threads to support the axial load partially, while the solid contact areas aremaintained tokeep stiffness and dumping effect. This study aims at developing the "half-floating leadscrew", to verify its availability and clarify the problems.First, to obtain data for designing the half-floating leadscrew, some experiments are performed using cylindrical model. The contact condition of screw threads is modeled to contacts between end surfaces of cylinders, and their frictional property is clarified to understand the friction decrease by the pneumatic pressure. The.frictional torque between the cylinders is measured under various conditions of axial load, pneumatic pressure and rotational speed. From the experimental results, it is confirmed that the cylindrical model shows 38 % decrease of friction loss when increasing pneumatic pressure by 0.1 MPa under the axial load of F=147 N.Next, a half-floating leadscrew is manufactured by approving simple pneumatic slots to a sliding leadscrew. The nominal screw threads profile is metric trapezoidal thread of Tr30 X 8. The recess of 2.4 mm width and 0.6mm depth is formed on the female threads. Thematerial of the nut is bronze casting ( BC6 ), while the material of the screw shaft is SCM415H. It is confirmed that the friction loss is decreased by 40 % when the pneumatic pressure is P=0.3 MPa under the axial load of F=147 N. And so, the availability of the half-floating leadscrewproposed is verified. Moreover, a positioning mechanism is constructed in order to apply the manufactured half-floating leadscrew.

滑动丝杠比滚珠丝杠和静压丝杠具有刚度高、排振效果好等优点，但也有摩擦损失大的缺点。本研究提出了一种既能改善摩擦性能，又不影响刚度优势和振动倾倒效应的方法。螺纹间接触界面提供气动压力，部分支撑轴向载荷，同时保持固体接触区域，保持刚度和倾倒效果。本研究旨在开发“半浮动丝杠”，验证其可行性并澄清存在的问题。为了获得设计半浮丝杠所需的数据，采用圆柱模型进行了实验。将螺纹的接触条件建模为气缸端面之间的接触，阐明了螺杆的摩擦特性，以了解气动压力对摩擦减小的影响。在轴向载荷、气压、转速等不同工况下，测量了气缸间的摩擦力矩。实验结果证实，在F=147 n的轴向载荷下，当气动压力增加0.1 MPa时，圆柱模型的摩擦损失降低38%。然后，将简单的气动槽改为滑动丝杠制成半浮动丝杠。公称螺纹轮廓为Tr30 X 8的米制梯形螺纹。内螺纹上形成宽2.4 mm、深0.6mm的凹槽。螺母材质为青铜铸造（BC6），螺杆轴材质为SCM415H。在F=147 n的轴向载荷下，当气动压力为P=0.3 MPa时，摩擦损失降低了40%，从而验证了所提出的半浮丝杠的有效性。此外，为了应用所制备的半浮丝杠，构造了定位机构。