This banjo bolt comprises: a head part; and a cylindrical shaft part having a longitudinal hole extending in a first direction. The head part is connected to one end section of the shaft part in the first direction, and an opening connected to the longitudinal hole is provided to the other end section of the shaft part in the first direction. The shaft part has at least one groove section and a transverse hole. The at least one groove section is provided to the inner surface of the longitudinal hole, extends in the first direction, and is recessed in a second direction crossing the first direction and in a direction away from the center line extending in the first direction of the longitudinal hole. The transverse hole is provided to the bottom section of the groove section, extends in the second direction, and connects the longitudinal hole and the outer section of the shaft part.
In this method for manufacturing a banjo bolt comprising a shaft portion provided internally with a longitudinal hole extending in a first direction: the shaft portion is machined from one side in a second direction intersecting the first direction to form a first lateral hole which extends in the second direction and which connects the outside of the shaft portion and the longitudinal hole, and a second lateral hole which is positioned on the opposite side to the first lateral hole with respect to the longitudinal hole, extends in the second direction and connects the outside of the shaft portion and the longitudinal hole, and which, when seen in the second direction, is larger than the first lateral hole and overlaps the entire first lateral hole; and a part of the shaft portion in which the first lateral hole is formed is machined from the other side in the second direction, through the second lateral hole, to form a third lateral hole that is larger than the first lateral hole and similar to the second lateral hole when seen in the second direction.
A press working method capable of forming a perforated portion with higher accuracy with respect to a workpiece being a ductile material. The press working method may comprise applying a first load to a workpiece being a ductile material with a press member to apply a preload within an elastic region of the workpiece, and then applying a second load exceeding the first load to the workpiece with the press member to provide a perforated portion in the workpiece, wherein the elastic region is larger than 0 MPa and is equal to or less than a limit shear stress value at which the workpiece is elastically deformed, the workpiece is a pipe made of metal, and the first load and the second load are applied in a state where an inside of the pipe is hollow.
Provided is a press working method with which a bore can be more precisely formed in a workpiece that is a ductile material. In a press working method according to the present invention, a press member applies a first load to a workpiece, which is a ductile material, to apply a preload within the elastic region of the workpiece, and subsequently, the press member applies a second load greater than the first load to the workpiece to form a bore in the workpiece. The elastic region is the region in which the shearing stress is greater than 0 MPa and is less than or equal to the value at the limit of elastic deformation of the workpiece. The workpiece is a metal pipe, and the first load and the second load are applied to the pipe in a hollow state.
An aluminum alloy bolt having a central axis C and comprising: a head portion; an underneck portion extending downward from the head portion; an underneck radiused portion formed between the head portion and the underneck portion, the underneck portion having a threaded portion. In the aluminum alloy bolt, a curvature region is defined which is enclosed by: a lower surface expanding inward and curving in the direction of the head portion from a surface of the underneck portion a certain distance L underneath an R-end on the surface of the aluminum alloy bolt which is the boundary between the underneck portion and the underneck radiused portion; an upper surface provided on the head portion side of the lower surface at a certain distance T from the lower surface; and the surface of the aluminum alloy bolt. An average crystal grain size of first crystal grains of the aluminum alloy of which the curvature region is composed is greater than an average crystal grain size of second crystal grains of the aluminum alloy of which the interior of the underneck portion inward of a threaded portion adjacent region adjacent to the threaded portion is composed.
C22F 1/00 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
C22F 1/05 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions
C22F 1/053 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with zinc as the next major constituent
6.
Pretensioner and process for manufacturing the same
A pretensioner (1) for a seat belt system (7) of an automobile includes a gas generator (2), a gas pipe (3), a piston (5) and a coupling mechanism (6). The gas generator is adapted to generate a high-pressure gas when a shock occurs in the automobile due to a collision, a sudden stop, etc. The gas pipe is formed to receive therein the gas generator. The gas pipe is adapted to guide the high-pressure gas released from the gas generator to the piston. The piston is adapted to be moved or displaced by the pressure of the high-pressure gas guided by the gas pipe. The coupling mechanism is connected to each of the piston and a buckle (8) of the seat belt system (7). The coupling mechanism is adapted to wind up or pull a seat belt (9) in accordance with the movement of the piston to increase a restraining force of the seat belt.
B60R 22/36 - Belt retractors, e.g. reels self-locking in an emergency
A62B 35/00 - Safety belts or body harnessesSimilar equipment for limiting displacement of the human body, especially in case of sudden changes of motion
B21D 39/06 - Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by platingTube expanders of tubes in openings, e.g. rolling-in
7.
PRETENSIONER AND PROCESS FOR MANUFACTURING THE SAME
Pretensioner (1) for automobile seat belt device (7) comprises gas generator (2), gas conduit (3), piston (5) and coupling means (6). The gas generator (2) generates a high-pressure gas when the automobile is impacted by collision, sudden stop, etc. The gas conduit (3) houses the gas generator (2). The gas conduit (3) guides the high-pressure gas released from the gas generator (2) to the piston (5). The piston (5) is moved or displaced by the pressure of the high-pressure gas guided by the gas conduit (3). The coupling means (6) is linked to the piston (5) and buckle (8) of the seat belt device (7). The coupling means (6) winds up or pulls seat belt (9) in accordance with the move of the piston (5) to thereby enhance the constraint force of the seat belt (9).
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