JP6519984B2 - Method of manufacturing simultaneously different types of processed pipe members - Google Patents

Description

  The present invention relates to a pipe member manufactured by direct cross-sectional processing and bending simultaneously on a straight pipe member having an annular cross-section.

  In recent years, in the field of manufacturing automobile parts, construction parts, furniture parts, etc., it is required to reduce the weight of products while securing rigidity. Although hollowing out the component parts of a product is an effective means for weight reduction, many parts are from the point of arrangement in a small space, integration of a plurality of parts, securing of designability, etc. It is manufactured by bending the material.

  For example, a bumper beam of a collision countermeasure component of an automobile is usually manufactured by bending a raw tube having a rectangular cross section so as to conform to the front shape of a vehicle body (see, for example, Patent Document 1).

  When a tube with a rectangular cross-section is bent to produce a curved tube or a tube in which a straight portion and a curved portion are mixed, the energy absorption amount of the tube is increased due to work hardening, but during bending, It may buckle or break. In addition, the accuracy of the cross-sectional shape may decrease at the curved portion of the pipe after bending, or the cross-sectional thickness may become uneven.

  Patent Document 2 discloses a method and apparatus for manufacturing a curved square tube by applying a roll press bending process to a straight tube having an annular cross section.

  According to this method and apparatus, a smoothly curved rectangular tube can be manufactured without buckling or breakage during bending, but a structure in which a lower roll is slid on a pedestal, or The structure of the device is complicated in that the structure which always applies a force toward the body is complicated, and the shape of the central portion of the pipe is not constrained by the mold during bending, so the shape of that portion There is a problem that the accuracy is reduced.

Japanese Patent Application Laid-Open No. 10-180360 JP 2007-307615 A

  In the present invention, based on the above-mentioned present state of the prior art, a straight pipe material having an annular cross-section (hereinafter sometimes referred to as "annular straight pipe material") is processed without causing buckling or breakage, and the cross-sectional shape has high accuracy It is an object of the present invention to provide tube members of various shapes.

  The inventors of the present invention have intensively studied a method for solving the above problems by using a simulation method. As a result, the following findings were obtained.

  (x) Tubes with high cross-sectional shape (following the contour of the mold) with high cross-sectional shape without buckling or breakage by simultaneously and simultaneously performing cross-sectional processing and bending with upper and lower press dies on annular straight pipe materials The members can be manufactured.

  (y) By changing the shape and structure of the upper and lower press molds, a tubular member having a cross-sectional shape with high accuracy and a shape according to the application can be manufactured from an annular straight pipe material without causing buckling or breakage. Can.

The present invention has been made based on the above findings, and the summary thereof is as follows.
(1) Cross section processing and bending processing are simultaneously and simultaneously performed on an annular straight pipe member having a smooth closed curve with no concave cross section , using upper and lower press dies including a curved portion in the longitudinal direction , simultaneously different types A manufacturing method for manufacturing a processed pipe member , which is in the longitudinal direction of the pipe member,
The cross-sectional shape of the straight pipe member including the curved portion is formed by forming the curved portion corresponding to the curved shape of the curved portion in the straight pipe material with the curved portions of the upper and lower press dies, A method of manufacturing a simultaneously-differently processed pipe member , wherein the cross-sectional shape is shaped as the contour of the mold of the mold.
(2) The method for manufacturing a simultaneously different processed pipe member according to (1), wherein the cross-sectional shape changes continuously or discontinuously in the longitudinal direction of the pipe member.
(3) Each of the upper and lower press dies has a bottom portion and a vertical wall standing from the bottom portion, and the upper and lower press dies are closed in the curved portion of the tube member. entire circumference, the manufacturing method of the simultaneous heterologous processing pipe member according to (1) or (2), characterized in that in contact with the bottom portion and the vertical wall portion.

  According to the present invention, it is possible to simultaneously and simultaneously apply cross-sectional processing and bending processing to an annular straight pipe material with upper and lower press dies to provide pipe members of various shapes with high precision in cross-sectional shape. .

It is a figure which shows the curved rectangular tube whose cross-sectional shape is height 42 mm x width 30 mm, a bending angle: 20 degrees, and bending R: 800 mm. (A) shows the side cross section of a curved rectangular tube, (b) shows the planar aspect of a curved rectangular tube, (c) shows the front aspect of a curved rectangular tube. An embodiment is shown in which an annular straight pipe member is once formed into a straight pipe member (width 28 mm) having a flat cross section, and then formed into a curved rectangular pipe. (A) shows a cross section of a flat straight pipe material formed by pressing an annular straight pipe material, and (b) shows a flat straight pipe material with upper and lower press dies simultaneously performing cross section processing and bending at the same time The mode to apply is shown typically. It is a figure which shows the example of the bending shape (shape of a simultaneous different-type processed pipe member) in the case of elongate annular straight pipe material. (A) shows a shape having straight portions on both sides of the central curved portion, (b) shows a shape having curved portions on both sides of the central straight portion, and (c) shows a shape of the central straight portion The shape which has a curved part which curves oppositely to the curvature of the curved part of (b) on both sides is shown, and (d) shows the shape where the whole of left-right asymmetry curves. The example of the cross-sectional shape of the simultaneous different-type processed pipe member cross-sectioned by the upper press die and lower press die is shown. (A) shows a hexagonal sectional shape, (b) shows an elliptical sectional shape, (c) shows an arbitrary sectional shape, and (d) shows a concave surface with four sides Indicates the shape.

The manufacturing method of the simultaneous different types of processed pipe member of the present invention (hereinafter sometimes referred to as “ the manufacturing method of the pipe member of the present invention”),
Cross section processing and bending processing are simultaneously and simultaneously performed on an annular straight pipe member having a smooth closed curve without a cross section using upper and lower press dies including a curved portion in the longitudinal direction, and a simultaneous different processed pipe member Manufacturing method, wherein in the longitudinal direction of the tubular member,
In the curved portions of the upper and lower press dies, while forming a curved portion corresponding to the curved shape of the curved portion in the straight pipe member, the longitudinal sectional shape of the straight tubular member including the curved portion is the upper and lower portions Forming a cross-sectional shape according to the contour of the mold of the press mold.

Hereafter, the manufacturing method of this invention pipe member is demonstrated.

  In the method and apparatus for manufacturing a square tube by subjecting an annular tube to roll press bending as disclosed in Patent Document 2, as described above, the structure of the device is complicated, and during bending, the tube is Since the outside of the central portion is not restrained by the mold, it has a problem that the shape accuracy of the portion is lowered.

  Based on this, the present inventors apply cross section processing and bending processing directly and simultaneously to an annular straight pipe material using upper and lower press dies, and a tube with a high cross sectional shape (as the contour of the mold) The idea was to make a model, and the simulation confirmed its feasibility.

  Figure 1 shows that simulation was performed by simultaneously applying bending and cross-sectional processing at a bending angle of 20 ° to the annular straight pipe material of φ 42.7 mm and thickness 1.6 mm with the upper and lower press dies. The curved rectangular tube 1 of 42 mm x width 30 mm and bending R: 800 mm "is shown.

  FIG. 1 (a) shows a side cross-section of the curved rectangular tube 1, FIG. 1 (b) shows a plan view of the curved rectangular tube 1, and FIG. 1 (c) shows a front view of the curved square 1. As shown in FIG.

  The present inventors apply cross section processing and bending processing directly and simultaneously to the annular straight pipe material with upper and lower press dies, and the cross sectional shape is high accuracy (following the contour of the mold) without causing buckling or breakage. Was confirmed to be able to manufacture a curved square tube).

  When cross-sectioning and bending are simultaneously and simultaneously applied to an annular straight pipe material with upper and lower press dies, non-uniform plastic deformation occurs during processing depending on the die shape of the die, and the cross-sectional shape according to the contour of the die Or the wall thickness in the circumferential direction of the tube may not be uniform. In this case, the annular straight pipe material may be formed into an annular straight pipe material (flat straight pipe material) having a flat cross section, and then molded using upper and lower press dies.

  FIG. 2 shows an aspect in which the annular straight pipe material is once formed into a straight pipe material (width 28 mm) having a flat cross section, and then formed into a curved rectangular pipe. Fig. 2 (a) shows a cross section of a flat straight pipe formed by pressing an annular straight pipe, and Fig. 2 (b) shows a cross section of the flat straight pipe with upper and lower press dies. An aspect which gives bending simultaneously is shown typically.

  As shown in FIG. 2 (b), the flat straight pipe 1 is mounted between the upper press die 2 and the lower press die 3 with the major axis direction perpendicular, and the flat straight pipe 1 is cross-sectioned and processed. A bending process can be applied simultaneously to produce a bent square tube (see FIG. 1).

  The annular shape of the annular straight pipe material is not limited to a circle, an ellipse, a flat circle, and includes a smooth closed curve without a dent. By selecting such an annular shape, it is possible to ensure the uniformity of plastic processing. Further, the annular straight pipe material may be made of a tailored blank material.

  Next, the present inventors change the mold shape and structure of the upper and lower press molds, and from an annular straight pipe material, a tube member having a cross-sectional shape with high precision (following the contour of the mold) according to the application. It has been confirmed that it can be manufactured without causing buckling or breakage.

  Although the simulation shown in FIGS. 1 and 2 was performed at a bending angle of 20 °, the inventors of the present invention performed cyclical cross-sectional processing and bending at the same time to buckle the annular straight pipe material even if the bending angle exceeds 20 °. It was confirmed that it could be done without breaking.

  The inventors also confirmed that the annular straight pipe can be bent into a desired shape by changing the bending angle at a predetermined position.

  FIG. 3 shows an example of the bending shape (the shape of the simultaneously different processed pipe member) in the case of a long annular straight pipe material. 3 (a) shows a shape having straight portions 4 on both sides of central curved portion 5, and FIG. 3 (b) shows a shape having curved portions 5 on both sides of central straight portion 4; (C) shows a shape having a curved portion 5 curving oppositely to the curvature of the curved portion in FIG. 3 (b) on both sides of the central linear portion 4; FIG. Shows a curved shape.

  Although FIG. 3 exemplifies the bending shape (the shape of the simultaneous different processed processed pipe member) in the case where the annular straight pipe material is long, the present inventors, even if the annular straight pipe material is not long, the annular straight pipe material Was confirmed to be able to be bent into a desired shape by changing the bending angle at a predetermined position.

  Furthermore, even if the mold cross section formed by the upper press mold and the lower press mold is changed, the present inventors simultaneously and simultaneously apply cross section processing and bending to the annular straight pipe material and perform buckling and breakage. It was confirmed that it was possible to manufacture a pipe member of high precision (following the contour of the mold) in cross-sectional shape without causing it.

  FIG. 4 shows an example of the cross-sectional shape of the simultaneously and differently processed pipe member 7 processed in cross section by the upper press die 3a and the lower press die 3b. 4 (a) shows a hexagonal sectional shape, FIG. 4 (b) shows an elliptical sectional shape, and FIG. 4 (c) shows an arbitrary sectional shape, FIG. 4 (d) 4 shows the cross-sectional shape of the concave surface.

  As described above, a tubular member having a variety of cross-sectional shapes with high precision (following the contours of the mold) (simultaneous disparities of different shapes) directly and simultaneously subjected to cross-sectional processing and bending to the annular straight pipe material without causing buckling or breakage. Processed tube members can be manufactured.

  However, since it is necessary to open the upper and lower press molds and take out the pipe member after molding (simultaneous different type processed pipe member), the cross-sectional shape of the pipe member can be taken out from the upper and lower press molds after molding. Limited to the shape.

  The cross-sectional shape of the simultaneous different processed pipe members can be changed continuously or discontinuously in the axial direction. Therefore, by changing the mold shape and structure of the upper and lower press dies, it is possible to buckle or break tube members having a cross-sectional shape with high precision (following the contour of the mold) according to the application from annular straight pipe material. Can be manufactured without causing

From the above simulation, it is understood that direct and cross-sectional processing and bending are directly and simultaneously applied to the annular straight pipe material to obtain pipe members of various shapes with high precision in cross-sectional shape, and the pipe member of the present invention It came to the production method of

  Next, although the Example of this invention is described, the conditions in an Example are one condition example employ | adopted in order to confirm the practicability and effect of this invention, and this invention is the one condition example. It is not limited. The present invention can adopt various conditions as long as the object of the present invention is achieved without departing from the scope of the present invention.

(Example)
Using a press die apparatus, cross-sectional processing and bending were simultaneously and simultaneously applied to an annular straight pipe having a diameter of 42.7 mm and a thickness of 1.6 mm at a bending angle of 22.5 °. During the processing, it was possible to obtain a curved rectangular tube with a bending R of 750 mm and a cross-sectional shape: height 42 mm × width 30 mm without buckling or breakage.

  The cross-sectional shape of the curved rectangular tube was as the contour of the mold over the entire length. The cross-sectional thickness was substantially uniform in the circumferential direction of the tube.

  As described above, according to the present invention, according to the present invention, cross section processing and bending processing are directly and simultaneously performed on an annular straight pipe material with upper and lower press dies, so that various cross-sectional shapes can be achieved with high accuracy. Can be provided. Thus, the present invention is highly applicable in the steel pipe processing industry.

DESCRIPTION OF SYMBOLS 1 Curved rectangular pipe 2 Flat straight pipe 3a Upper press die 3b Lower press die 4 Straight portion 5 Curved portion 6 Simultaneous different types of processed pipe members

Claims (3)

Cross section processing and bending processing are simultaneously and simultaneously performed on an annular straight pipe member having a smooth closed curve without a cross section using upper and lower press dies including a curved portion in the longitudinal direction, and a simultaneous different processed pipe member Manufacturing method, wherein in the longitudinal direction of the tubular member,
The cross-sectional shape of the straight pipe member including the curved portion is formed by forming the curved portion corresponding to the curved shape of the curved portion in the straight pipe material with the curved portions of the upper and lower press dies, A method of manufacturing simultaneously processed dissimilar pipe members characterized by forming a cross-sectional shape according to the contour of the mold of the mold (except for the method of performing bulge processing) .   The method according to claim 1, wherein the cross-sectional shape changes continuously or discontinuously in a longitudinal direction of the pipe member.   Each of the upper and lower press dies has a bottom surface portion and a vertical wall standing from the bottom surface portion, and in a state where the upper and lower press dies are closed, the entire circumference of the curved portion of the tube member is The method according to claim 1 or 2, wherein the bottom surface portion and the vertical wall portion are in contact with each other.

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