Abstract: Provided is a canvas frame including a first frame which is made of a metal material and connected, formed in a rectangular frame shape, and provided so that a part of a front surface is in contact with a canvas, and has a body part in which the inside is hollowed and inner and outer fastening parts connected to inner and outer surfaces of the body part, respectively; and a second frame which is made of a foam synthetic resin and has an insertion groove formed on the upper portion so that the body part is inserted, a support part formed so that an edge of the canvas is fixed and supported to the lower portion thereof by a fixing member, and inner and outer insertion parts which are formed on inner and outer surfaces of the support part, respectively, to be inserted and fastened to the inner and outer fastening parts.

Abstract: Provided is a canvas frame including a first frame which is made of a metal material and connected, formed in a rectangular frame shape, and provided so that a part of a front surface is in contact with a canvas, and has a body part in which the inside is hollowed and inner and outer fastening parts connected to inner and outer surfaces of the body part, respectively; and a second frame which is made of a foam synthetic resin and has an insertion groove formed on the upper portion so that the body part is inserted, a support part formed so that an edge of the canvas is fixed and supported to the lower portion thereof by a fixing member, and inner and outer insertion parts which are formed on inner and outer surfaces of the support part, respectively, to be inserted and fastened to the inner and outer fastening parts.

Abstract: The present invention relates to a hard coating including an MT-TiCN layer and an ?-alumina layer which are formed by using a chemical vapor deposition method. A hard coating for cutting tools, which is a coating formed on a base material of a cutting tool formed of a hard material, the coating comprising: a TiCN layer; and an ?-alumina layer formed on the TiCN layer, wherein: the ?-alumina layer has a main peak (maximal strength peak) of (006) plane located between 20-40 degrees during a psi rocking analysis by an XRD; a residual stress in the ?-Al2O3 layer is ?0.9-0.4 GPa; the TiCN layer is composed of TiCxNyOz (x+y+z?1, x>0, y>0, z?0); a composition ratio of C/(C+N) is greater than or equal to 0.4 and smaller than 0.5; the ratio of TC(220)/TC(422) is smaller than 0.45; and the ratio of TC(220)/TC(311) is less than 0.45.

Abstract: The present invention relates to a hard coating including an MT-TiCN layer and an ?-alumina layer which are formed by using a chemical vapor deposition method. A hard coating for cutting tools, which is a coating formed on a base material of a cutting tool formed of a hard material, the coating comprising: a TiCN layer; and an ?-alumina layer formed on the TiCN layer, wherein: the ?-alumina layer has a main peak (maximal strength peak) of (006) plane located between 20-40 degrees during a psi rocking analysis by an XRD; a residual stress in the ?-Al2O3 layer is ?0.9-0.4 GPa; the TiCN layer is composed of TiCxNyOz (x+y+z?1, x>0, y>0, z?0); a composition ratio of C/(C+N) is greater than or equal to 0.4 and smaller than 0.5; the ratio of TC(220)/TC(422) is smaller than 0.45; and the ratio of TC(220)/TC(422) is less than 0.45.