An experimental and theoretical investigation of the reaming operation

Despite the wide range of applications of reamers in manufacturing industries, the theoretical work in this area is very limited. An initial survey of the reaming process indicated that there was very limited work carried out in reaming. Therefore 2 avenues were investigated to improve the understanding of the reaming process--an experimental program to understand the reaming process and a theoretical analysis of the reaming process. Experimental work carried out has revealed that there are three components of force and torque which are developed in a reaming operation. Thrust force and cutting torque which both are constant during a reaming operation are generated as the result of material removal by the chamfer of the reamer. The chamfer section of the reamer removes material from an initially drilled hole to bring the hole to more accurate size. A rubbing component of torque is also developed as the result of contact between the helical part of the reamer and the hole. This rubbing torque has been found to be a function of the distance that the reamer has travelled into the workpiece. Rubbing action by the helical part of the reamer is performed to create a better surface finish. Two theoretical models are developed in order to predict the thrust force, cutting torque and the rubbing torque in reaming. The model developed for the cutting torque and thrust uses the variable flow stress theory of machining. In this work the reamer cutting edges are subdivided into individual cutting edge and analysed as a single point tool with a cutting geometry. The model predicts the values of thrust and cutting torque for each cutting edge and the total value is obtained by multiplying the values by the number of cutting edges. This model takes into consideration parameters such as the tool geometry, cutting conditions and the work material variable flow stress properties. The rubbing model is based on the latest theories of wave formation in friction and is able to predict the values of rubbing torque in reaming. Existence of the wave has been verified using SEM analysis. The rubbing model takes into account parameters such as, tool geometry, wave size, lubrication condition and the coefficient of friction between the helical part of the reamer and the hole. Experimental work is carried out for a wide range of cutting conditions and two different work materials in order to test the validity of these models. It has been shown that the experimental and predicted values of thrust force, cutting torque and the rubbing torque are in good agreement and therefore the developed models are able to predict the cutting parameters.

Grantor dc:publisher

UNSW, Sydney

Year dc:date

1997

Author dc:creator

• Narimani, Ramin

• Reamers
• Reaming

Statement dc:rights

• open access
• CC BY-NC-ND 3.0
• free_to_read

Licence

• https://purl.org/coar/access_right/c_abf2
• https://creativecommons.org/licenses/by-nc-nd/3.0/au/

Language dc:language

EN

Identifier

https://doi.org/10.26190/unsworks/4474

OAI identifier oai:identifier

oai:unsworks.library.unsw.edu.au:1959.4/55303