Search

In the present work, the mixing process of different components of abrasive stones of cubic boron nitride used for rough honing was studied. Stones are made by the sintering process of abrasive grains, a metallic bond, and a humectant that favors covering of each abrasive grain by the bond. Incorrect mixing of abrasive grains with the bond and humectant can result in stones with nonuniform abrasive grain distribution. As the abrasive stone wears out, grain distribution will vary and modify efficiency of the honing operation. Tin is the metal having the lowest melting point among metals in the bond. By means of a scanning electron microscope and energy-dispersive X-ray microanalysis, tin segregation was discarded, which could have led to abrasive grain segregation. Later, mixing tests of the different components of the stones were performed at different mixing times, Postprint (published version)

In the manufacturing process of abrasive stones with cubic boron nitride (CBN) as abrasive and metallic binder, some differences were observed regarding abrasive density at different heights of the stones. If abrasive density is too low, honing stones do not cut the material properly. Honing stones are obtained by means of sintering processes. Previously, a humectant material is added to abrasive grains, and then they are mixed with metallic binder. Humectant is used to assure covering of each abrasive grain with binder. In the present work, along the manufacturing process of honing stones, quality of the mixing process of components was assessed by means of two different parameters: covering degree of grains by binder (CD) and homogeneity degree (HD) of the mix before sintering process. Both parameters are calculated by means of weight measurement in the mixing step. Different quantities of humectant and different mixing times were taken into account. A higher quantity of humectant implies a higher covering degree, leading to more homogeneous honing stones. For this reason, highest quantity of humectant is recommended within the range studied. However, a certain mixing time is required to assure homogeneity of the mix prior to sintering., Postprint (published version)

In the present work, the mixing process of different components of abrasive stones of cubic boron nitride used for rough honing was studied. Stones are made by the sintering process of abrasive grains, a metallic bond, and a humectant that favors covering of each abrasive grain by the bond. Incorrect mixing of abrasive grains with the bond and humectant can result in stones with nonuniform abrasive grain distribution. As the abrasive stone wears out, grain distribution will vary and modify efficiency of the honing operation. Tin is the metal having the lowest melting point among metals in the bond. By means of a scanning electron microscope and energy-dispersive X-ray microanalysis, tin segregation was discarded, which could have led to abrasive grain segregation. Later, mixing tests of the different components of the stones were performed at different mixing times, Postprint (published version)