An Ultrasonic Fluid-Solid Interface Coupling Support Device Assisting Slender Helical Surface Grinding

Abstract

The invention relates to an ultrasonic fluid-solid interface coupling support device for assisting in elongated spiral surface parts machining and used on a grinder. The device is applicable to auxiliary machining of weak rigid shaft parts such as elongated shafts and elongated spiral surfaces. According to the device, an ultrasonic device structure is preliminary designed based on the resonance frequency equation of an ultrasonic device, and further optimized by combining the finite element simulation and the experiment. The device is arranged on a machine bed and ensures that an ultrasonic tool head is always opposite to a grinding wheel; and the device is in indirect contact with a workpiece, and a layer of oil film with a certain pressure is between the device and the workpiece. By means of the device, the key problems that the workpiece flutters, is uneven in heating and force, and is thermally deformed caused by continuous grinding during the machining of the elongated spiral surface parts are solved, and the machining precision and surface integrity of the elongated spiral surface parts can be greatly improved.

Description

Technical field [0001] The present invention relates to the field of precision manufacturing processing of elongated spiral surface parts, and is specifically designed to assist in an auxiliary slender spiral surface-grinding, the present invention can be applied to elongated shafts, slender ball screws and so on. Auxiliary machining device for rigid axis components. Background technique [0002] In metal grinding, the elongated spiral surface part is one of the typical difficult processing parts. It is the difficulty of processing: the elongated spiral surface is large, the rigidity is low, which is extremely easily bent under the grinding force. Elastic deformation, causing the workpiece vibration to exacerbate or even cause a quantity of the workpiece, causing the surface quality of the workpiece; the workpiece is less heat dissipation due to elongation, resulting in a large amount of heat deformation of the workpiece, exacerbated the bending deformation of the workpiece vibra...

AI Technical Summary

Problems solved by technology

Although the support device of the steady frame has been widely used in the production grinding process of the ball screw, there are still some problems and limitations

First of all, the problem of workpiece flutter, the support method of the steady frame is static rigid support, which can suppress the low-frequency and high-amplitude vibration of the ball screw to a certain extent, but it cannot suppress the high-frequency and low-amplitude vibration, and the unsuppressed vibration is easy to be on the tooth surface. Vibration marks on the upper surface increase the surface roughness of the tooth surface

Secondly, the workpiece is stressed and heated unevenly. Although the brackets (2.1, 2.2, 2.3) can provide a reverse support force for the grinding force during the grinding process of the ball screw, it reduces the effect of the grinding force to a certain extent. The lower bending elastic deformation, but because the steady frame 2 is fixed on the moving feed shaft of the workpiece 1, and there is relative movement with the position of the grinding wheel, the grinding force of the grinding wheel on different grinding parts of the workpiece is different, which will cause the dimensional error of the workpiece after grinding , uneven surface quality

Again, the problem of continuous grinding, the grinding wheel and the workpiece are continuously ground in the traditional ball screw grinding process, and continuous grinding is likely to cause the temperature of the workpiece to rise and the thermal deformation to increase

Finally, the problem of tensile stress. When the grinding wheel is ground away from the support position of the center frame, the ball screw will be bent and deformed due to the grinding force. At this time, the bending deformation will easily lead to tensile stress, which will reduce the ball screw. The service life of the bar is prolonged, so that the cracking of the tooth surface occurs during use

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