Abstract
The bone drilling temperature fields under different cutting parameters and cooling modes were experimental researched by using common twist drill, diamond punching pin, diamond bullet-like grinding head and diamond spherical grinding head. Three cooling modes were applied, namely, natural air cooling, normal saline pouring cooling and normal saline spray cooling. K-thermocouple was used to measure temperature in bone hole. Results showed that the drill shape could influence drilling temperature greatly. The maximum drilling temperature of diamond spherical grinding head is 46.31°C. The maximum drilling temperature of common twist drill is 42.1°C and that of diamond bullet-like grinding head is 38.29°C. The drilling temperatures at drill speed is under 560 r/min, 900 r/min, 1,250 r/min and 2,100 r/min are 38.84°C, 41.1°C, 43.84°C and 46.31°C. This reflects that under same of other drilling parameters, drilling temperature increases with the increase of drill speed. The maximum bone drilling temperatures of diamond punch pin under 2,100 r/min speed of mainshaft and air cooling conditions vary as feed speed increase firstly and then decrease. The normal saline spray cooling has the lowest maximum drilling temperature of (29.34°C) at same depth, following by normal saline pouring cooling of (32.45°C) and air cooling of (40.28°C) successively. The normal saline spray cooling has the best cooling effect, followed by normal saline pouring cooling and air cooling successively.
Highlights
Bone fracture exists throughout the human history
Some focused on influence law of drilling parameters on bone drilling temperature
Effect of cooling modes on drilling temperature was studied by 3.0 mm diamond bullet-like grinding head under 2,100 r/min speed of mainshaft and 0.5 mm/s feed speed
Summary
Bone fracture exists throughout the human history. People’s understanding and therapy of bone fracture is developing continuously. Some focused on influence law of drilling parameters (e.g. speed of mainshaft, load and axial pressure) on bone drilling temperature. Rafel [9] carried out an experimental study on high rotate speed and bone drilling temperature, but got conflicting results He used a series of medical drills with different shapes to drill holes on upper jaw bone of human bodies without external pouring cooling. Larry and Matthews et al [12] made a series of experiments on human femoral shaft They paid attentions to effect of axial force on bone drilling temperature. The final test data showed that with the increase of axial force, bone drilling temperature rises. This disagrees with the results of Matthews and Hirsch. This lays foundations for reasonable optimization and selection of drilling parameters
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