Improved multi-frequency numerical control ultrasonic machining method and numerical control machining machine tool

Abstract

The invention provides an improved multi-frequency numerical control ultrasonic machining method and a numerical control machining machine tool. No rotational motion exists, meanwhile, a free mass block is of an openable structure, when a drill bit performs ultrasonic machining and it is necessary to clamp the mass block without movement, the influence of the clamped mass block without movement onthe drill bit can also be avoided, the influence of the fixed free mass block on ultrasonic machining is completely eradicated, and meanwhile, a spring buffer mechanism is arranged between a clampingchuck and a clamping arm so that the impact of the free mass block on a clamping device can be absorbed; and meanwhile, a sliding groove structure capable of preventing the mass block from rotating is arranged on an amplitude transformer so that the clamping device can quickly clamp the free mass block.

Description

technical field [0001] The invention relates to the technical field of numerical control machining, in particular to an improved multi-frequency numerical control ultrasonic machining method and a numerical control machining machine tool. Background technique [0002] Numerical control machining is a mechanical processing method that uses digital information to control the displacement of parts and tools. It has the advantages of high processing efficiency and stable product quality. Therefore, it has always been a hot research topic. At present, in order to adapt to hard and brittle materials such as infrared optical crystals, The precision machining of engineering ceramics, optical glass, quartz, and silicon crystals is now commonly used to apply ultrasonic machining technology to CNC machine tools to improve the machining accuracy of workpieces. For example, Patent Document 1 discloses a multi-frequency numerical control ultrasonic machining method, auxiliary device and m...

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Problems solved by technology

For example, Patent Document 1 discloses a multi-frequency numerical control ultrasonic machining method, auxiliary device and machining drilling machine. side problem, it proposes a processing method that clamps the mass block to vibrate freely to remove the coupled low-frequency and large-amplitude vibration, and releases the clamping device after entering the surface of the processed material to allow the free mass block to vibrate freely, but this processing method exists The following defects: a. When the clamping device clamps the mass block, the vibration on the horn 9 will still be transmitted to the clamping device through the mass block, so that the clamping device will also vibrate, and the vibration will react to the horn 9, on the other hand, the vibration will be transmitted to the workbench 8, which may resonate with the ultrasonic generator or frame or support frame, and finally affect the processing of the drill bit, introducing too many uncertain factors, making the ultrasonic generator The vibration becomes uncontrollable, reducing the machining accuracy; b. The mass block slides back and forth on the horn 9, and when the clamping device clamps the mass block, the impact force it receives is relatively large, which affects the service life of the clamping device

[0006] To sum up, in the prior art, there is no multi-frequency CNC ultrasonic machining machine tool that does not require rotational movement and can separate the mass from or combine with the horn, and for the processing of hard and brittle materials, although the comprehensive use of ultrasonic, The multi-frequency CNC ultrasonic machining of the free mass block also realizes that the cracking of the workpiece surface needs to remove the coupled low-frequency and large-amplitude vibration, but it does not take into account that the clamping device that clamps the free mass block will also transmit the vibration to the frame, And it will also react on the horn, which may even cause the frame to resonate, affecting the machining accuracy and equipment life. I did not realize that the clamping device will receive a large impact when clamping the free mass block that vibrates back and forth, which will affect the clamping effect. Based on this, the multi-frequency numerical control ultrasonic machining method provided by this application is an improved multi-frequency numerical control ultrasonic machining method. In this machining method, the free mass block is set as an open-close structure. When the vibration of the coupling free mass block is achieved, the end of the free mass block is clamped by the clamping device to remove it from the horn, and when the vibration of the free mass block needs to be coupled, the free mass block is clamped into the horn On, can further improve the workpiece processing quality

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