English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

By drilling a large number of experiments, the drilling force, bit positioning error and other data, Using high resolution camera and microscope observation techniques to obtain microdrill digital photos, based on the structural analysis of micro drill, the stress model is established, Based on the combination of experimental research and theoretical calculation, the combination of quantitative and qualitative analysis. The fracture mechanism of micro drill is defined from three aspects, such as the fracture observation of micro drill, the calculation of ultimate stress and the calculation of stress cycle .The results show that the fracture of micro drill is that the drilling force reaches the strength limit of the material, which leads to the failure of the static strength. Introduction Although experts and scholars have done a lot of theoretical research and experimental analysis on the fracture of microdrill in micro hole drilling, Online monitoring drilling force, spindle motor current and cutting heat and temperature, AE signal and power signal and displacement signal and other signals[1-4], is to control the micro drill drilling process and real-time monitoring of the state, However, the research on the fracture mechanism of micro drill is less, this paper will study the fracture mechanism of micro drill in detail. Experimental System and Processing Conditions This experiment is in the ZG high speed precision brush drill, the measurement system is shown in Fig.1. The strain gauge is mounted on the drill table and the workpiece is clamped on the strain gauge. In the process of drilling, axial force and torque of the dynamometer is measured by the strain gauge, the strain sensor will transformate force signal into voltage signal by the bridge circuit and transmitted to NI6013 data acquisition card, complete the signal A/D conversion, the analog signal into digital micro signal; data acquisition card digital output the signal is input to the industrial control computer, analysis, processing, display and storage of the signal by the signal processing module of the collected; in the control part, the instruction issued by the computer, transfer to the microcontroller through the serial communication, the pulse signal emitted by the microcontroller through the power amplifier to the stepper motor, so as to realize the control the axial feed motion of microdrill[5]. This experiment is carried out in the high speed brushless precision drill, to measure the drilling axial force and drilling torque signal using strain gauge sensor. The main drilling conditions for the diameter of 0.5 high-speed steel twist drill, H62 brass workpiece material, drilling depth of 2, spindle speed of 22000, feed rate, 40, oil lubrication. 1160 7th International Conference on Education, Management, Computer and Society (EMCS 2017) Advances in Computer Science Research (ACSR), volume 61

Experimental Research on Fracture Mechanism of Microdrill