A method for multistep machining a cutting tool includes defining a data set of the cutting tool, positioning the workpiece in a machining device, determining a data set of the workpiece to be machined, defining at least one machining program based on the defined data set in relation to the determined data set of the workpiece, subjecting the workpiece to the at least one machining program, to obtain intermediate geometries of the workpiece, determining a second data set by measuring means including the intermediate geometries of the workpiece and transferring the machined workpiece to a second machining device. Furthermore, the steps of positioning, determining data set of the workpiece, defining machining program, subjecting the workpiece to the machining program, determining a second data set and transferring to the second machining device are repeated until the workpiece takes on the shape of the target geometries.

A surface-coated cutting tool includes a base material and a coating covering the base material. The base material includes a rake face and a flank face. The coating includes a TiCN layer. The TiCN layer has a (311) orientation in a region d1 in the rake face. The TiCN layer has a (422) orientation in a region d2 in the flank face.

A cutting insert includes a substrate and a cutting-edge insert. The substrate has, in a thickness direction of the substrate, a bottom surface, and a top surface opposite to the bottom surface. The top surface has a polygonal shape composed of a plurality of sides in a plan view as seen along the thickness direction. The top surface is provided with a projection projecting to a side opposite to the bottom surface along the thickness direction. The projection has a through-hole passing through the substrate along the thickness direction. The projection has a side surface contiguous to the top surface. The side surface is composed of a curved line protruding to a side opposite to the through-hole in the plan view as seen along the thickness direction.

A cutting insert includes a substrate and a cutting-edge insert. The substrate has, in a thickness direction of the substrate, a bottom surface, and a top surface opposite to the bottom surface. The top surface has a polygonal shape composed of a plurality of sides in a plan view as seen along the thickness direction. The top surface is provided with a projection projecting to a side opposite to the bottom surface along the thickness direction. The projection has a through-hole passing through the substrate along the thickness direction. The projection has a side surface contiguous to the top surface. The side surface is composed of a curved line protruding to a side opposite to the through-hole in the plan view as seen along the thickness direction.

A process for processing a rotary tillage blade for a dry farmland based a wasted steel rail is provided. The process specifically includes the following steps: selecting a waste annotated steel rail U71Mn or U75V; breaking the steel rail into a rail head, a rail web and a rail bottom in a cutting area by means of a flame cutting device and then cutting the steel rail; and applying a hydrostatic pressure to the steel rail by using a hydraulic machine to separate the rail head, the rail web and the rail bottom. The wasted steel rail can be processed into the rotary tillage blade for the dry farmland by means of methods such as segmenting, rolling, blanking, punching, electric furnace heating, bending, hot forging and thermal treatment. The surface hardness and a wear resistance value thereof are superior to those of an existing rotary tillage blade.

A process for processing a rotary tillage blade for a dry farmland based a wasted steel rail is provided. The process specifically includes the following steps: selecting a waste annotated steel rail U71Mn or U75V; breaking the steel rail into a rail head, a rail web and a rail bottom in a cutting area by means of a flame cutting device and then cutting the steel rail; and applying a hydrostatic pressure to the steel rail by using a hydraulic machine to separate the rail head, the rail web and the rail bottom. The wasted steel rail can be processed into the rotary tillage blade for the dry farmland by means of methods such as segmenting, rolling, blanking, punching, electric furnace heating, bending, hot forging and thermal treatment. The surface hardness and a wear resistance value thereof are superior to those of an existing rotary tillage blade.

This application discloses a parametric design method of a roller tooth profile of a work roll for roll forming of a flow channel of a metal bipolar plate. The method includes: (1) an engagement transmission drawing is plotted according to depth h of the flow channel and a rolling period angle, where h=r.sub.1-r.sub.6. A first-half surface of a tooth consists of six segments, where the top surface segment, the upper half segment of the tooth side, the root segment, and the transition segments for the top corner and the root corner are arc curves, and the lower half segment of the tooth side is a straight line. (2) With the center O.sub.1 of the upper roller as the origin, a transverse end coordinate system is established, and the six segments of the left-half tooth are designed regarding parameters.

This application discloses a parametric design method of a roller tooth profile of a work roll for roll forming of a flow channel of a metal bipolar plate. The method includes: (1) an engagement transmission drawing is plotted according to depth h of the flow channel and a rolling period angle, where h=r.sub.1-r.sub.6. A first-half surface of a tooth consists of six segments, where the top surface segment, the upper half segment of the tooth side, the root segment, and the transition segments for the top corner and the root corner are arc curves, and the lower half segment of the tooth side is a straight line. (2) With the center O.sub.1 of the upper roller as the origin, a transverse end coordinate system is established, and the six segments of the left-half tooth are designed regarding parameters.

The production method of the novel austenitic stainless steel kitchen knives and the low-carbon high-chromium martensitic alloy powder of the present invention include providing an austenitic stainless steel knife body. It cladding low-carbon high-chromium martensitic alloy powder on the austenitic stainless steel cutter body through high-frequency density laser pulse cladding process, tempering treatment, cutter face grinding, end face grinding, and edge processing; The invention adopts an austenitic stainless steel cutter body, and then adopts a high-frequency density laser pulsation cladding process to make a low-carbon high-chromium martensitic stainless steel at the cutting edge by plasma electrofusion.

The production method of the novel austenitic stainless steel kitchen knives and the low-carbon high-chromium martensitic alloy powder of the present invention include providing an austenitic stainless steel knife body. It cladding low-carbon high-chromium martensitic alloy powder on the austenitic stainless steel cutter body through high-frequency density laser pulse cladding process, tempering treatment, cutter face grinding, end face grinding, and edge processing; The invention adopts an austenitic stainless steel cutter body, and then adopts a high-frequency density laser pulsation cladding process to make a low-carbon high-chromium martensitic stainless steel at the cutting edge by plasma electrofusion.