连续分度冷滚打机床滚打头结构改进

发布时间：2018-11-25 09:42

【摘要】：采用连续分度方式冷滚打花键时滚打轮和工件间存在一个干涉运动,实际生产中将机床滚打头部分整体倾斜一个安装角以减小干涉量。在安装角作用下,滚打轮成形轮廓发生变化,带来新的成形误差。分析了干涉现象产生的原理,设计了改进的滚打头结构,利用斜铜套将滚打轮自转轴反向倾斜一个安装角,使滚打轮成形轮廓不变。建立了计算滚打轮在键槽截面上成形曲线的数学模型,利用键槽宽度误差对冷滚打成形误差进行了表征。当冷滚打机床采用现有滚打头结构时,设置安装角虽然提高了成形精度,仍存在较大的成形误差;采用改进的滚打头结构时,安装角在一定范围内取值,干涉量和滚打头倾斜带来的成形误差均减小为0 mm.改造机床滚打头部分进行冷滚打实验,精确测量了试样键槽轮廓,结果表明:不设置安装角时,键槽宽度误差的实测值与理论计算相符;设置安装角时,键槽宽度误差的实测值及其相对变化量都很小。实验验证了改进的滚打头结构的合理性。
[Abstract]:There is an interference motion between the roll wheel and the workpiece when cold roll splines are used in the continuous indexing mode. In actual production, the roll head part of the machine tool is tilted to an installation angle to reduce the interference. Under the action of mounting angle, the profile of roll wheel is changed, which brings new forming error. In this paper, the principle of interference phenomenon is analyzed, and the improved roll head structure is designed. The rotary shaft of the roller is tilted backward by an oblique copper sleeve to make the profile of the roller unchanged. A mathematical model for calculating the forming curve of roller on the keyway section is established, and the error of cold roll forming is characterized by the width error of the keyway. When the cold rolling machine adopts the existing roll head structure, the setting of the installation angle improves the forming accuracy, but there is still a large forming error. When the improved roll head structure is adopted, the installation angle is selected within a certain range, and the forming error caused by interference and roll head tilt is reduced to 0 mm.. The cold roll test was carried out on the roll head part of the modified machine tool and the profile of the sample keyway was accurately measured. The results show that the measured value of the width error of the keyway is in agreement with the theoretical calculation when the installation angle is not set. When the installation angle is set, the measured value and relative variation of the keyway width error are very small. The rationality of the improved roll head structure is verified by experiments.
【作者单位】：西安理工大学机械与精密仪器工程学院;西安工业大学光电工程学院;
【基金】：国家自然科学基金项目(51075124、51475366) 高等学校博士学科点专项科研基金项目(20116118110005)
【分类号】：TG502

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