Characteristics Of Work Material Research Articles

Neuro-fuzzy GMDH and its application to modelling grinding characteristics

Mathematical models, in which many input variables are involved, require a range of input and output data, since the number of parameters increases with the input variables. GMDH (Group Method of Data Handling) has been used for the identification of a mathematical model that has many input variables but limited data needs by using a hierarchical structure. This paper proposes a neuro-fuzzy GMDH model, adopting Gaussian radial basis functions (GRBF) as partial descriptions of GMDH. GRBF is reinterpreted as both a simplified fuzzy reasoning model and as a three-layered neural network. As an example of applying the algorithm, the wheel wear equation is identified, using data from experiments of abrasive cut-off. In the model, characteristics of work materials, grinding fluids, factors of wheels, wheel velocity and table feed are used as input variables, and the grinding ratio is the resulting output. The validity of the model is confirmed within the predicted accuracy by using additional data.

New generation superabrasive tool with monolayer configuration

In recent years, chemically bonded single-layer diamond abrasive tools are getting preference over their galvanically bonded counterparts for many applications because of their outstanding performance. The chemical bonding is achieved by direct brazing of the diamond grit to a steel substrate with an active braze alloy. The present study has shown that the principle of chemical bonding can be extended to fabricate monolayer CBN-coated tools. It is further indicated that understanding of the influence of various construction parameters on the formation of the topography of the tool is required to prepare a good brazed tool. Various case studies are presented to show the influence of the topography of the working surface of such a tool, work material characteristics and grinding parameters on the behaviour of the tool in terms of cutting capability, force and power requirement, loading, grit wear and grit pull out.

Research on the Relation between Cutting Temperature and Durability of Cutting Tools

This paper presents some of results of experiments carried out to determine the relationship between cutting temperature and durability of cutting tools. Three kinds of carbon steel were turned by high-speed steel tools of same kind and shape under various cutting conditions, and the cutting temperature was measured by the tool-work thermo-couple method. Durability tests of tools were performed under the same depth of cut and feed per revolution and various cutting speeds. Some important conclusions obtained dare as follows : (1) The cutting temperature θ is exprssed as θ=k Tβ vα, T mean thickness of chip, v cutting speed, k, α & β constants of work material. This relation is a characteristics of work material. (2) The tool life M is expressed as M=km Tγ θ-m, where km, γ & m are constants of tool. This relation is a characteristics of cutting tool.