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Acoustic emission (AE) which describes the transient stresswaves generated by the rapid release of energy from solidsources has been widely used in nondestructive testing(NDT) of materials and structures especially in healthmonitoring. As a class of deep neural networks,convolutional neural network (CNN) has applications inmany fields. Several investigations have been conducted onthe application of CNN in feature learning and faultdiagnosis and prognosis. Metalworking fluids (MWF) play asignificant role in manufacturing processes. By reducingfriction between tool and workpiece, the heat generation inmetalworking process is affected. Thread forming is atransformative manufacturing process for generating threadsin ductile materials. As the thread geometry is manufacturedby cold forming of the material, lubricating properties of theMWF strongly effect tool wear and workpiece quality. Upto now, there are only a few papers on MWF classificationusing the process variables like torque or released AE. Inthis contribution, a novel approach combining AE signalsand CNN is raised for MWF classification. A tribometer isused to carry out thread forming trials under well-controlledexperimental conditions. AE measurements are conducted incontext of thread forming. The AE signals are divided intosuitable samples and CNN is applied as classifier. Theresults of MWF classification show that the new approachcould distinguish different types of MWF.