A tubular product includes a tubular body made of steel and having a tube wall which includes an opening. The opening is produced by a high-speed stamping process at a stamping speed of more than 4 m/s. The opening is situated in the tube wall in a region thereof which has a tensile strength Rm>800 MPa.

In the present invention, in a piercing punch and a burring punch which are shaft members having a first axis line as the center axis lines and are provided so as to be movable along the first axis line, first, after prepared holes having the first axis line as the center axis lines with respect to the first wall portion and the second wall portion are formed using the piercing punch, burring holes having the first axis line as the center axis lines with respect to the first wall portion and the second wall portion are formed using the burring punch.

In the present invention, in a piercing punch and a burring punch which are shaft members having a first axis line as the center axis lines and are provided so as to be movable along the first axis line, first, after prepared holes having the first axis line as the center axis lines with respect to the first wall portion and the second wall portion are formed using the piercing punch, burring holes having the first axis line as the center axis lines with respect to the first wall portion and the second wall portion are formed using the burring punch.

According to the embodiment of the present disclosure, it provides a method of manufacturing a piston of a pump for brake system, the piston fabricated using a piercing process by press forming to have an inlet path communicating with a suction port through which oil is introduced.

A hand-held apparatus is for hole-making in an elongated body. The apparatus has a housing including a rotatable cutting tool arranged to be axially movable from a non-cutting position into a cutting position. The first end portion of the housing comprises a clamping device arranged to be adjusted from a first, inactive position into a second, active position, wherein the clamping device, in the active position, is arranged to hold the apparatus fixed to the elongated body. The apparatus further has a device for connecting to a driving means, for example a hand-held drill.

A hand-held apparatus is for hole-making in an elongated body. The apparatus has a housing including a rotatable cutting tool arranged to be axially movable from a non-cutting position into a cutting position. The first end portion of the housing comprises a clamping device arranged to be adjusted from a first, inactive position into a second, active position, wherein the clamping device, in the active position, is arranged to hold the apparatus fixed to the elongated body. The apparatus further has a device for connecting to a driving means, for example a hand-held drill.

A rectangular tubing, rectangular hole punching device includes a two-sided die carried by a mandrel upon which a rectangular tubing workpiece is sleeved. The two-sided die makes possible a punched rectangular hole having a width extending substantially from one interior lateral side wall of the workpiece adjacent the side of the workpiece being punched to the opposing interior side wall of the workpiece adjacent the side of the workpiece being punched, and includes a pair of tool steel die pieces that are longitudinally spaced from each other. The portions of lateral side walls corresponding to the position of the two sided die within the workpiece are supported against deformation from punching by applying a high compressive force to the portions of the laterally spaced side walls of the workpiece that are in correspondence with the position of the two-sided die, during the punching operation.

A rectangular tubing, rectangular hole punching device includes a two-sided die carried by a mandrel upon which a rectangular tubing workpiece is sleeved. The two-sided die makes possible a punched rectangular hole having a width extending substantially from one interior lateral side wall of the workpiece adjacent the side of the workpiece being punched to the opposing interior side wall of the workpiece adjacent the side of the workpiece being punched, and includes a pair of tool steel die pieces that are longitudinally spaced from each other. The portions of lateral side walls corresponding to the position of the two sided die within the workpiece are supported against deformation from punching by applying a high compressive force to the portions of the laterally spaced side walls of the workpiece that are in correspondence with the position of the two-sided die, during the punching operation.

The present invention relates to a bullet, in particular precision bullet, comprising a bullet core with a bow-side section, a tail-side section with a bullet base and a guide band located therebetween, and a bullet jacket completely surrounding the bullet core, wherein in the region of the bullet core tail axially offset from the guide band and/or in the region of a tail-side end face of the bullet core base and/or in the region of the bullet core bow axially offset from the guide band a profiling is placed, in accordance with the bullet jacket, adapts complementary in shape in in such a way that an anti-rotation structure is formed between the bullet jacket and the bullet core.

The present invention relates to a bullet, in particular precision bullet, comprising a bullet core with a bow-side section, a tail-side section with a bullet base and a guide band located therebetween, and a bullet jacket completely surrounding the bullet core, wherein in the region of the bullet core tail axially offset from the guide band and/or in the region of a tail-side end face of the bullet core base and/or in the region of the bullet core bow axially offset from the guide band a profiling is placed, in accordance with the bullet jacket, adapts complementary in shape in in such a way that an anti-rotation structure is formed between the bullet jacket and the bullet core.