Extruding forming method and mould for tube with special-shaped section
A technology of extrusion forming and extrusion direction, which is applied in the direction of metal extrusion dies, metal extrusion mandrels, motorcycles, etc., can solve the problems of difficult extrusion forming pipes, etc., to reduce weight, increase productivity, and reduce costs Effect
Inactive Publication Date: 2006-06-28
HONDA MOTOR CO LTD
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Problems solved by technology
However, it is difficult to extrude a pipe that meets the above requirements using the aforementioned existing extrusion die.
Method used
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[0034] Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 15. FIG.
[0035] 1 to 10 show a first embodiment of the present invention. Fig. 1 is a schematic left side view of a two-wheeled motor vehicle V in which a pipe formed by an extrusion method using a pipe extrusion die of the present invention is used as a main pipe. In the motorcycle V, a handle bar 3 is provided at the upper end of a front fork 2 rotatably supported on a head pipe 1, and a front wheel 4 is pivotally supported at the lower end thereof. A pair of left and right main pipes 5 connected to the head pipe 1 at the front end extend symmetrically to the left and right while extending obliquely downward behind the vehicle body, and are connected by a horizontal pipe (not shown) at the rear end. At the rear ends of the two main pipes 5, a pair of left and right pivot plates 6 are respectively connected. On the pivot shafts 7 supported on the two pivot plates 6, the rear ...
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The invention provides a die for tube extrusion molding is provided with a fixed die (37) and a movable variable die (39) and a tube is formed by material extruded from an opening (50) formed by the superposition in the direction of extrusion of a fixed die hole and a variable die hole. The opening (50) has an opening for a tube wall (51) forming the wall of the tube and openings for two intermediate walls (52) forming connecting walls in the inside space of the tube, the tube is composed of a part having the connecting wall and a part having no connecting wall by opening or blocking the opening for the intermediate wall (52) by the cores (44b and 47b) according to the amount of the movement of the variable die (39) and the tube different in the rigidity in the longitudinal direction is formed. The invention provides an extrusion molding process and a die for tube extrusion molding wherein a tube having an intermediate wall extended in a direction which crosses a direction in which the width of a tube varies can be formed easily and at a low cost.
Description
technical field [0001] The present invention relates to a method for extrusion forming of a pipe having an irregular section in the longitudinal direction and a pipe extrusion die used for extruding a pipe, such as for a vehicle, especially for a vehicle body frame of a two-wheeled vehicle. Background technique [0002] In the prior art, for a pipe material used as a vehicle body constituent member such as a motorcycle, as a pipe extrusion molding method having a variable section along the longitudinal direction and an extrusion molding die used for the extrusion molding, Japanese Patent Laid-Open Publication No. 10-286619 (refer to Figure 11 ) is already known. The extrusion die has a fixed die and a sliding die, the fixed die is provided with a fixed die hole, and the sliding die is provided with a sliding die hole of the same shape as the fixed die hole, and is designed to be free under the fixed die. slide. Two or three fixed cores are arranged side by side through ga...
Claims
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IPC IPC(8): B21C23/08B21C25/08B62K11/02B21C25/02B62K19/06
CPCB62K11/04B21C23/085B21C25/08B62K19/06
Inventor 柳桥善隆星好
Owner HONDA MOTOR CO LTD