A hot-spinning formation method for large-diameter titanium alloy cylindrical parts. A workblank is placed in a resistance furnace to heated to 600-650° C., is maintained at this temperature for 0.5-1 h and is then taken out of the resistance furnace; after the workblank is heated, the inner diameter of the workblank becomes larger; the heated workblank is installed on a mandrel, and spinning is started when a maximum clearance between the workblank and the mandrel is less than 0.5 mm; the mandrel and the spinning rollers do not need to be preheated, and a multi-pass spinning process is adopted, such that the workblank can deform more uniformly. A vertical spinning lathe is used for spinning, the mandrel is easy to change, and the workblank is easy to assemble and disassemble.

Provided is a machining jig on which a carbon film (3) is formed on a machining surface of a rigid substrate (1), in which the carbon film (3) indicates a Raman spectroscopy spectrum with an intensity ratio, represented by the formula: I.sub.D/I.sub.G (where I.sub.D is the maximum peak intensity at 1333±10 cm.sup.−1 in the Raman spectroscopy spectrum of the carbon film surface, and I.sub.G is the maximum peak intensity at 1500±100 cm.sup.−1 in the Raman spectroscopy spectrum of the carbon film surface), exceeding 0.6. Also provided is a method of manufacturing seamless can bodies, the method including a step of using a mold machining member, on which a diamond film is formed on a machining surface, to press work a metal material onto the machining surface of the mold machining member in a state where a coolant is interposed.

Provided is a machining jig on which a carbon film (3) is formed on a machining surface of a rigid substrate (1), in which the carbon film (3) indicates a Raman spectroscopy spectrum with an intensity ratio, represented by the formula: I.sub.D/I.sub.G (where I.sub.D is the maximum peak intensity at 1333±10 cm.sup.−1 in the Raman spectroscopy spectrum of the carbon film surface, and I.sub.G is the maximum peak intensity at 1500±100 cm.sup.−1 in the Raman spectroscopy spectrum of the carbon film surface), exceeding 0.6. Also provided is a method of manufacturing seamless can bodies, the method including a step of using a mold machining member, on which a diamond film is formed on a machining surface, to press work a metal material onto the machining surface of the mold machining member in a state where a coolant is interposed.

A metallic worked article suppressing the worked surfaces from being scratched during the plastic work that is conducted aiming at reducing the thickness or decreasing the diameter. The metallic worked article has a reduced thickness or a decreased diameter as obtained through the plastic work, wherein on the worked surface thereof, the ratio Ra1/Ra2 of an arithmetic mean roughness Ra1 measured in a direction at right angles with the direction of working and an arithmetic mean roughness Ra2 measured in the direction of working, is from 0.5 to 1.5.

The present invention is directed to a dual sided incremental sheet forming apparatus and method for incrementally forming sheet materials such as sheet metal by utilizing opposed primary and secondary forming tool assemblies and a sheet feeding assembly. The primary forming tool assembly includes a rigid tool and the secondary forming tool assembly includes a compressible and resilient backing layer having either a cylindrical or flat configuration. The sheet feeding assembly positions the sheet material between the two forming tools. The rigid tool applies force to one surface of the sheet material while the resilient backing tool applies counter force to the opposite surface of the work piece as it supports the work piece. This dual sided process localizes the forces on the sheet material so that stresses are advantageously controlled to produce accurately formed asymmetric shapes, without the need for expensive dies. The use of a rigid tool with an opposed resilient backing tool both having linear independent motion also avoids potential wrinkling and tearing of the resulting work piece and enables the formation of numerous, highly detained asymmetric products.

An incremental forming tool of the present invention includes a holding portion attached to an incremental forming apparatus and a free curved surface part for pressing a metal plate. The free curved surface part is made of at least a hard metal base material and a surface of the free curved surface part is covered with a hard film. The surface of the hard film has an Rpk of 0.15 μm or less, the Rpk is defined by JIS B 0671 and is calculated from a material ratio curve of a roughness curve, and has an Ra of 0.2 μm or less, the Ra is defined by JIS B 0601 and is calculated from a roughness curve. Therefore, a molded product having a smooth worked surface with no roughness can be produced without adding any extra equipment for preventing adhesion.

Disclosed is a method for manufacturing a corrosion-resistant hot-stamping part and a device thereof. The method includes the following steps: blanking a bare steel plate into a required blank shape; heating the blank to above AC3 in an oxygen-free heating furnace to austenite the blank; putting the austenitized blank into a mold to mold a part; and conducting a surface treatment of the part to form a corrosion-resistant coating layer on a surface of the part. The hot-stamping part manufactured using the described method has good surface quality and great corrosion-resistant performance

Disclosed is a method for manufacturing a corrosion-resistant hot-stamping part and a device thereof. The method includes the following steps: blanking a bare steel plate into a required blank shape; heating the blank to above AC3 in an oxygen-free heating furnace to austenite the blank; putting the austenitized blank into a mold to mold a part; and conducting a surface treatment of the part to form a corrosion-resistant coating layer on a surface of the part. The hot-stamping part manufactured using the described method has good surface quality and great corrosion-resistant performance

The invention relates to a die for cutting a shape or pattern from a material, the die being composed of a base plate (1) comprising an upper surface (2) and a lower surface (3). The die comprises one or more raised edges (4) in the form of a pattern or shape to be die-cut or embossed, on each of the upper and lower surfaces, such that the die can be used to die-cut or emboss two sheets of material simultaneously.

A method for a hot press forming apparatus and a hot press forming apparatus (102; 202) for forming a blank (104), the hot press forming apparatus (102; 202) comprising a first die (106; 206) and a second die (108), wherein the first die (106; 206) has at least one die cavity (110; 210), and the second die (108) has at least one die protrusion (112), wherein the hot press forming apparatus (102; 202) is configured to, by means of the first and second dies (106, 108; 206, 108), press form the blank (104) placed between the first and second dies (106, 108; 206, 108). At least one of the first and second dies (106, 108; 206, 108) has a draw radius (116; 216), wherein a member (118; 218) is attached to a die (106; 206) which has a draw radius (116; 216). At least a portion (119; 219) of the member (118; 218) is positioned adjacent to or on the draw radius (116; 216). The member (118; 218) defines a first press forming surface (120; 220), and the die (106; 206) holding the member (118; 218) defines a second press forming surface (122; 222) outside the first press forming surface (120; 220). The member (118; 218) and the die (106; 206), which holds the member (118; 218), are configured such that during the same hot press forming, a first friction arises between the blank (104) and the first press forming surface (120; 220) when the blank (104) is in contact with the member (118; 218) and a second friction arises between the blank (104) and the second press forming surface (122; 222) when the blank (104) is in contact with the die (106; 206) which holds the member (118; 218), the first friction being lower than the second friction.