Prediction method of cutting force along feed direction in ultrasonic vibration assisted grinding of brittle materials
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A technology of cutting force prediction and ultrasonic vibration, which is applied in the direction of grinding machine parts, grinding/polishing equipment, workpiece feed movement control, etc. Quantitative impact etc.
Inactive Publication Date: 2017-06-06
NANJING UNIV OF SCI & TECH
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In the existing actual machining process, the impact of vibration parameters on the movement trajectory and removal amount of abrasive grains is not considered, so the cutting process of side abrasive grains is the same as that of ordinary grinding, resulting in poor prediction accuracy
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Embodiment 1
[0070] The present invention takes the ultrasonic vibration-assisted grinding of pre-sintered zirconia ceramics as an example, and its processing form is as follows figure 2 As shown, the tool used is a diamond abrasive hollow tool, the tool rotates with the spindle and performs axial ultrasonic vibration, and the tool performs feed motion. The specific parameters of diamond abrasive tools, the main performance parameters and vibration parameters of pre-sintered zirconia ceramics are shown in the table below.
[0071] Wear particle concentration C a
100 Tool outer diameter R 8mm Grit size b 126μm Vickers hardness H V
700MPa Abrasive protrusion height h e
89μm Vibration amplitude A 5μm Abrasive half top angle α π / 4 Vibration frequency f 12.9KHz Grit density 3.25×10 -3 g / mm 3
[0072] C 2 =0.226
[0073]
[0074] In the cutting force prediction formula in the feed direction obtained in step 8, ...
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Abstract
The invention provides a method for predicting cutting force of an ultrasonic vibration assisting grinding fragile material in the feed direction. The method includes the steps of determining the valid cutting time during which each single grinding particle actually takes part in cutting, establishing the relation between the radial force borne by each single grinding particle at different positions and the maximum radial force, establishing the relation of the vibration cycle number of each single grinding particle within the valid cutting time, the rotating speed of a main shaft and the ultrasonic vibration frequency, obtaining the material removal size of each single grinding particle, obtaining the number of valid grinding particles taking part in cutting, establishing the relation between the total theoretic removal size of the material within the valid cutting time and the actual removal size of the material within the valid cutting time, obtaining the maximum radial force borne by the grinding particles in the cutting process, and obtaining the cutting force in the feed direction. By distinguishing the cutting process and the ordinary cutting of the grinding particles on the side face, the calculation process better conforms to the actual machining conditions, and the precision of predicting the cutting force of the ultrasonic vibration assisting grinding fragile material in the feed direction is improved.
Description
technical field [0001] The invention relates to ultrasonic vibration assisted grinding processing technology, in particular to a method for predicting cutting force in the feed direction during ultrasonic vibration assisted grinding of brittle materials. Background technique [0002] Brittle materials, such as zirconia ceramics, glass, etc., have excellent physical properties such as high temperature resistance, wear resistance, high hardness, high strength ratio, and corrosion resistance, so they are widely used in many fields, such as tooth restoration, aerospace, military industry , energy, machinery, electronics, petrochemical and automotive fields. However, due to its high brittleness, low fracture toughness, low thermal conductivity, and very close elastic limit and strength limit, traditional processing methods are difficult to process brittle materials. Therefore, the rotary ultrasonic machining technology can be introduced into the processing of brittle materials, ...
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