Cutting tool for high-quality high-efficiency machining and cutting method using the same

A cutting tool for high-quality high-efficiency machining of which portions involved in cutting comprise hard members,

• said cutting tool including a finishing cutting edge which is first cut into a workpiece, and superfinishing cutting edges for finishing the workpiece following the finishing cutting edge,
• wherein said superfinishing cutting edges project from said finishing cutting edge in such a direction that the depth of cut increases, and each include a burnishing portion having a predetermined width in the feed direction of the tool, and a wiper portion extending from said finishing cutting edge to said burnishing portion, whereby said superfinishing cutting edges burnish a finished surface of the workpiece, while removing a affected layer formed on the finished surface by said finishing cutting edge, and
• wherein said finishing cutting edge is formed at a corner, and said superfinishing cutting edges are formed on right and left sides of said finishing cutting edge.

A cutting tool for high-quality high-efficiency machining of which portions involved in cutting comprise hard members,

• said cutting tool including a finishing cutting edge which is first cut into a workpiece, and superfinishing cutting edges for finishing the workpiece following the finishing cutting edge,
• wherein said superfinishing cutting edges project from said finishing cutting edge in such a direction that the depth of cut increases, and each include a burnishing portion having a predetermined width in the feed direction of the tool, and a wiper portion extending from said finishing cutting edge to said burnishing portion, whereby said superfinishing cutting edges burnish a finished surface of the workpiece, while removing a affected layer formed on the finished surface by said finishing cutting edge, and
• wherein said finishing cutting edge has steps in the direction in which the tool is cut into a workpiece, whereby said steps individually cut different portions of the workpiece.

A cutting tool for high-quality high-efficiency machining of which portions involved in cutting comprise hard members,

• said cutting tool including a finishing cutting edge which is first cut into a workpiece, and superfinishing cutting edges for finishing the workpiece following the finishing cutting edge,
• wherein said superfinishing cutting edges project from said finishing cutting edge in such a direction that the depth of cut increases, and each include a burnishing portion having a predetermined width in the feed direction of the tool, and a wiper portion extending from said finishing cutting edge to said burnishing portion, whereby said superfinishing cutting edges burnish a finished surface of the workpiece, while removing a affected layer formed on the finished surface by said finishing cutting edge, and
• wherein said burnishing portion of each of said superfinishing cutting edges has steps in the direction in which the tool is cut into a workpiece, whereby a finished surface of the workpiece is cut first by one of said steps of which the amount of projection B from said finishing cutting edge in the direction in which the tool is cut into the workpiece is the smallest, and then by another of said steps of which the amount of projection B is the second smallest.

A cutting tool for high-quality high-efficiency machining of which portions involved in cutting comprise hard members,

• said cutting tool including a finishing cutting edge which is first cut into a workpiece, and superfinishing cutting edges for finishing the workpiece following the finishing cutting edge,
• wherein said superfinishing cutting edges project from said finishing cutting edge in such a direction that the depth of cut increases, and each include a burnishing portion having a predetermined width in the feed direction of the tool, and a wiper portion extending from said finishing cutting edge to said burnishing portion, whereby said superfinishing cutting edges burnish a finished surface of the workpiece, while removing a affected layer formed on the finished surface by said finishing cutting edge, and
• wherein said hard members each comprise a cBN-based sintered body containing not less than 65% and not more than 85% by volume of cBN particles and having a thermal conductivity of not more than 70 W/m·K, and a hard film made of a carbide, nitride, oxide, carbonitride or carboxynitride of at least one element selected from the group consisting of the elements of the 4a, 5a and 6a groups in the periodic table and Al and covering the surface of said cBN-based sintered body.