TW200417427A - Deformed element pipe for hydraulic bulging, hydraulic bulging device using the element pipe, hydraulic bulging method using the element pipe, and hydraulic-bulged product - Google Patents

Abstract

A deformed element pipe for hydraulic bulging in accordance with the present invention has a peripheral length with an outer diameter gradually increasing or decreasing from one to the other axial side thereof and has a parallel part formed at least one end thereof. If the hydraulic bulging device and the hydraulic bulging method are used, then, for example, even when a deformed steel pipe having a cross sectional shape varying in the axial direction as in a tapered pipe is hydraulically bulged, a bulging in which an internal pressure loading and an axial pressing are combined with each other can be performed to provide a larger expansion ratio than before and, further, the joining and plug-in connection thereof to the other part can also be easily performed.

Description

200417427 (1) 发明 Description of the invention [Technical field to which the invention belongs] The present invention relates to a special-shaped tube that provides hydraulic projection processing, and a hydraulic projection processing device and hydraulic projection for hydraulic projection processing using the special-shaped tube. A machining method and a hydraulically-embossed workpiece to be subjected to hydraulically-embossing processing. [Prior art]

Compared with other forming processing methods, hydraulic protrusion processing has many advantages. For example, since a complicated shape such as a cross-sectional shape can be processed in the direction of the long axis, a mechanical method that requires welding and joining can be processed by integral molding. In addition, since this processing generally spreads the entire part to be processed and produces work hardening, a high-strength product can be obtained even if a soft tube is used.

In addition, there is less rebound after processing, and the dimensional accuracy of the product is good (the shape is fixed well). For this reason, the manufacturing process of the product size correction is not needed, and the manufacturing process is omitted. The hydraulic protrusion processing is evaluated to have the above-mentioned excellent characteristics, and more recently, it has been formed as a method particularly used as a method for manufacturing automotive parts. Generally, when a tube is formed by hydraulic projection processing, a straight tube (hereinafter, referred to as a “straight rod”) having a uniform circular cross-section in the long axis direction is used as a material. After the material is subjected to bending processing and extrusion processing as "pre-forming", hydraulic protrusion processing is performed as the last process of the processing process. As a result of such a continuous processing process, it is possible to manufacture hydraulic protrusions processed from straight steel tubes into a predetermined shape. -5- (2) 200417427

Fig. 1 is a diagram illustrating the final process of the hydraulic protrusion process of a product obtained by using a conventional linear pipe. As shown in the figure, in the final hydraulic protrusion process, the processing fluid is injected into the linear pipe pi installed in the upper and lower molds 1 and 2 through the injection hole 3, and the internal pressure is applied. In addition to the internal pressure load, the material pipe P1 (hereinafter, referred to as the "squeeze") is pressed into the axial direction from both pipe ends by the squeegee tools 4, 5 which also serve as a sealing tool. In the hydraulic protrusion processing, a product P 2 having various cross-sectional shapes is manufactured by combining a load internal pressure and a pressing shaft. In addition, the pinch tools 4, 5 which also serve as a sealing tool are connected to a hydraulic cylinder (not shown), and control the axial position and the pinch force during the hydraulic protrusion process. In the hydraulic protrusion process, the pressing shaft from the pipe end to the axial direction promotes the metal flow when the material pipe is expanded, and has the effect of increasing the expansion limit of the material pipe. For this reason, in hydraulic protrusion processing, the pressing shaft from the pipe end to the axial direction is a very important processing process. Specifically, in the hydraulic projection processing, when the pressing shaft is not used but the internal pressure load is used for processing, the linear pipe P 1 is significantly reduced in thickness with the expansion. For this reason, the straight pipe P1 is broken during the hydraulic protrusion process. That is, a range (pipe expansion limit) in which the forming of the linear pipe P 1 is restricted is formed. In addition, the hydraulic protrusion process has a problem caused by the shape of the tube. As described above, as one of the advantages of this processing, even if a complicated processing shape with a different cross-sectional shape in the axial direction can be obtained, there is still a limit to the processing shape that can be obtained -6- (3) 200417427. For example, in the case where the perimeter increase rate (pipe expansion rate) is defined = {(the outer perimeter of the processed product at this location / the circumferential length of the pipe)-1} x 1 0 0% ' The shape characteristics and the material pipe conditions (material, plate thickness) used, but the final axis is in addition to the effective tube end area 'perimeter increase rate (pipe expansion rate) is only about 25%.

The perimeter increase rate (expansion rate) 'exceeding this limit cannot be used for hydraulic protrusion. In order to improve the degree of freedom in the shape design of the processed product and to obtain a processed product with a more complex cross-sectional shape under the original prescribed conditions for increasing the perimeter (expansion rate), it is necessary to think of a shape of the tube. To cope with this problem, it has been proposed to use a substantially conical tube instead of a straight tube (hereinafter referred to as a "tapered tube"). That is, it is difficult to form a straight pipe by using a tapered pipe. For example, even a part whose perimeter is increased along the axial direction can be reduced, and the accompanying process can be reduced. The perimeter increase rate can be formed into a predetermined processed shape (for example, refer to Japanese Patent Application Laid-Open No. 200 2 3 2 1 842, page 1, page 2). However, in the case of using a tapered material tube whose cross-sectional shape is changed in the axial direction to perform hydraulic protrusion processing, and when a pressing tool for a straight material tube shown in the above-mentioned figure is used, the pressing operation is performed on the tapered material tube. difficult. Fig. 2 is a diagram for explaining a problem that occurs when a conventional taper tool for a linear tube is used to perform a taper to a tapered tube. As shown in the figure, on the large-diameter side, there is a self-aligning axis that cannot be tapered to the tapered tube TP1, and on the small-diameter side, the pressure-axis can be reached to the tapered tube TP1, but with the final axis As the pressing tool 4 enters the upper and lower dies 1 and 2, and the inside and outside limits of the tapered pipe TP1 on the pressing tool 4 side are not sufficient, a leak such as a leak may occur. Fig. 3 is a diagram illustrating a conventional hydraulic protrusion processing process using a conical tube. (A) shows the state before processing, (b) shows the state before the internal pressure load is applied, and (c) It displays the status when processing is completed.

In the conventional hydraulic protrusion processing using the conventional tapered tube TP1, as shown in FIG. 3, although the tapered pressing shaft tools 6 and 7 are used at the front end portion, the pressing shaft cannot be used, so the hydraulic pressure is applied only by internal pressure The protrusion processing is general, and TP2 in FIG. 3 shows a tapered material tube after forming the pipe end, and TP3 shows a product (hydraulic protrusion processed product) after hydraulic protrusion processing. In the processing process shown in Fig. 3, the conical tube TP2 cannot be used for the pressing shaft. Therefore, as described above, in the stage of hydraulic protruding processing, only the forming range other than the degree of breakage is used for processing. Therefore, it is a fact that the effect of using a conical tube in the hydraulic protrusion process cannot be fully exerted. For this reason, in the case of using a tapered tube for hydraulic protrusion processing ', in addition to the internal pressure load on the tube, development of a technology for pressing the shaft from the end of the tube in the axial direction is expected. In the case where a conventional conical tube is subjected to hydraulic projection processing ', in addition to the difficulty of pressing the shaft, there is also a problem that the hydraulic projection is joined to other components. -8- (5) 200417427 Fig. 4 is a diagram for explaining the problem of joining a hydraulic protrusion with a rectangular cross section, and (a) shows the shape of a conventional hydraulic protrusion. The shape 'showing the shape of the hydraulically-protruded processed product of this invention' with respect to the axial direction of each processed product shows the inclination of a pipe end part. (C) A cross-sectional shape showing the hydraulic protrusion processing of (a) and (b) above.

As shown in Fig. 4 (a), the product PT3 which is hydraulically protruded by using a conventional conical tube as a material is inclined at the end of the tube only by 0. For this reason, when welding and joining with other members, accuracy cannot be ensured, so joining with other members is not easy. Moreover, 'the tube end is inserted into other parts and combined. In the case of inserting a joint, positioning is difficult because accuracy cannot be ensured in the same manner. For this reason, it is necessary to finish the processing such as cutting off the end portion of the hydraulic protruding workpiece after the hydraulic protruding processing. [Summary of the Invention] The present invention has been developed in view of the above-mentioned conventional problems, and an object thereof is to provide a hydraulic protruding process using a profiled pipe with a cross-sectional shape that changes in the axial direction, and is applied to the pipe. The internal pressure load can perform the pressure shaft from the end of the pipe to the axial direction, and can obtain a large tube expansion rate of the special-shaped pipe for hydraulic protrusion processing, and a hydraulic protrusion processing device and a hydraulic protrusion using the special-shaped pipe. Machining method, and hydraulically protruding workpiece. In order to achieve the above object, the special-shaped pipe for hydraulic protrusion processing according to the present invention belongs to the special-shaped pipe for hydraulic protrusion processing, and is manufactured from -9-200417427

One of the axial directions goes to the other and the outer diameter gradually increases or decreases, and a parallel portion is formed on at least one of the end sides. In the special-shaped material pipe for hydraulic protrusion processing of the present invention, the length of the parallel portion is greater than the total length required to produce a necessary length by the amount of the pressing shaft and the seal during processing by the hydraulic protrusion processing.

In addition, the special-shaped material pipe manufactured by supplying a hydraulically-protruded processed product having a rectangular cross section or a polygonal cross section is designed so that the radius of curvature R of the corner portion of the parallel portion corresponds to the axial distance of the pipe end portion. Corresponding to the difference in the perimeter difference of the profiled tube. Then, at least one of the upper and lower mold bodies is provided with parallel portions on the inner surface of the end side and the outer surface of the pressing tool corresponding to the inner surface of the end side, respectively. When the hydraulic protrusion processing apparatus of the present invention is in a mold, a combination of an internal pressure load and a pressure shaft can be formed.

Thereby, in the hydraulic protrusion processing, it is possible to form a system which can obtain a larger pipe expansion ratio than in the past, and also can easily form a joint with other parts. [Embodiment] Fig. 5 is a sectional view showing an example of the shape of a tapered material tube constituting a profiled material tube of the present invention. The special-shaped material pipe 11 for hydraulic protrusion processing according to the present invention is a special-shaped material pipe for providing hydraulic protrusion processing. As shown in (a) (b), the outer diameter has gradually increased from one to the other in the axial direction or Reduced perimeter, and forming parallel portions 1 1 a, 1 1 b on at least one of the ends (in the example shown in FIG. 5 is the small diameter side -10- (7) 200417427 and both ends of the large diameter side) . In the special-shaped material pipe for hydraulic projection processing of the present invention, the length of the parallel portions 11a and 11b is expected to be equal to or greater than the total length required to produce a necessary length by the amount of the pressing shaft and the seal by the hydraulic projection processing. Fig. 6 is a diagram illustrating the overall configuration of a profiled pipe according to the present invention. (A) shows an example in which parallel portions having a circular cross section are formed at both ends of a tapered portion having a circular cross section, and (b) shows a An example in which a parallel portion having a rectangular cross section is provided at both ends of a tapered portion having a rectangular cross section.

The embodiment shown in Fig. 5 (a) will be described in more detail with reference to Figs. 6 (a) (b). Fig. 6 (a) shows the most basic form, so that parallel portions 1 1 a and 1 1 b having a circular cross section are formed at both ends of a tapered portion having a circular cross section.

Fig. 6 (b) shows parallel portions Ua, lib having rectangular cross sections provided at both ends of a tapered portion having a rectangular cross section. In the example shown in FIG. 6 (b), the “parallel portions 11a, lib” are spread over the entire length, and the parallel portion 1 1 a on the small-diameter side is a cross section shown in FIG. 10 (a) described later, and The parallel portion 1 1 b on the large-diameter side is a cross section shown in FIG. 11 (c) described later. Fig. 7 is a diagram illustrating the overall configuration of another profiled pipe according to the present invention. Compared with the configuration of the above-mentioned figure 6, a profile with a transfer portion is shown between the parallel portion on the large diameter side and the tapered portion in the center Example of the material tube. Next, the embodiment shown in Fig. 5 (b) will be described in detail using Fig. 7 (a) (b). Fig. 7 (a) shows parallel sections 1 1 a, 1 1 b with a circular cross section formed at both ends of a tapered section having a circular cross section, and a row of flat -11-(8) (8) 200417427 on the large diameter side A transition portion Π C is provided between the portion 1 1 b and the central tapered portion. Fig. 7 (b) shows parallel sections 1a and Πb having rectangular cross sections at both ends of a tapered section having a rectangular cross section, and parallel sections 1 1b on the large-diameter side and a central tapered section. In the same manner as above, the transfer portion 11c is provided. In the above-mentioned FIG. 6 (b) or FIG. 7 (b), the shapes of the parallel portions 1 1 a and 1 1 b formed at both ends are shown as having a rectangular cross section, but the parallel portions 1 1 a, 1 1 The shape of b is a trapezoidal cross-sectional shape as shown in FIG. 12 to be described later, or an L-shaped cross-sectional shape as shown in FIG. 13 to be described later, or a polygonal cross-sectional shape (not shown). also may. In this case, if the final end surface shape after the hydraulic protrusion processing is designed so as to be consistent with the end surface shape of the product, the material yield is improved, which is suitable. In addition, although the tapered portion in the center of FIG. 6 (b) or FIG. 7 (b) is shown as a rectangular cross section, there is no reason that the central portion has a rectangular cross section, even as shown in FIG. 6 (a) or The circular cross-section of FIG. 7 (a) is also acceptable, and it is also possible to perform bending processing or press processing from the up, down, left, and right, even if it can be inserted into a die for hydraulic projection processing. Fig. 8 is a diagram illustrating a method of manufacturing a profiled pipe of the present invention having parallel portions at the end portion on the large diameter side. The same (a) is an overall perspective view, (b) is an expanded view, and (c) is an illustration. A trapezoidal figure close to the expanded view shown in (b). Manufacturing method of the profiled tube 11 of the present invention having a parallel portion 1 1 b at the large-diameter side end portion of the tapered portion having a circular cross section as shown in FIG. 8 (a) -12- (9) ( 9) 200417427 If explained, the formation is as follows. The profiled tube 11 shown in FIG. 8 (a) is simply bent in a plate having the shape shown in FIG. 8 (b), and a-b and a '-b', c-d, and c '- If the ends of d,, b—e and c—e, b, one of e and c, —e are joined, as shown in FIG. 8 (a), a parallel portion 1 1 b can be obtained at the end of the large diameter side.的 形 材 管 1 1 of the profiled tube. On the other hand, in Fig. 8 (c), the same as (b) is marked with a dotted line, and a trapezoidal shape close to this is shown with a solid line. As can be seen from the comparison between the solid line and the dashed line, in the case where the trapezoid shown in Fig. 8 (c) is simply curved, it is in the region of b-c-e and b, a c '-e' Areas have developed granulation. That is, it is difficult to manufacture a profiled material pipe having a parallel portion lib at the end in a rolled plate process using a trapezoidal shape as a material, such as the profiled material pipe 11 of the present invention. The simplest method is the method described with reference to FIG. 8. Although the method of simply bending and joining the sheets having the expanded shape of the profiled tube 11 of the present invention is simply used, the other method is used to explain the above. The method of the profiled tube U of the present invention in the shape shown in Figs. 6 and 7. In the case of the shape shown in FIG. 6 (a), for example, by using a "simple conical tube" as the material, the inner diameter is enlarged and the outer diameter is reduced. And available. In the case of the shape shown in Fig. 6 (b), it can be obtained by extruding the long portion of the central body in addition to the above. In the description of the present invention, the "simple conical tube" is the material of the special-shaped tube of the present invention, which means that -13- (10) (10) 200417427 parallel portion is not formed on one side or both ends. Conical tube. In the case of the shape shown in Fig. 7 (a), for example, the "simple conical tube" may be used as the material, and the inner diameter expansion processing may be performed simultaneously on the small-diameter side and the large-diameter side. In addition, in the case shown in Fig. 7 (b), it can be obtained by pressing the central body long portion in addition to the above. Fig. 9 is a view showing another embodiment of the profiled tube using the present invention and a finale tool of the same, and (a) is an enlarged view of the finale tool having an overall perspective view; (b) is a small diameter (C) is an enlarged view of a pressing tool that uses such a small-diameter side sealing tool. In the embodiment shown in Fig. 9, as shown in (a), parallel sections 1 1 a and 1 1 b having rectangular cross sections are formed at both ends of a tapered surface having a rectangular cross section. Moreover, in the embodiment shown in FIG. 9, the parallel portion 1 1 a on the small-diameter side on a simple tapered tube is a portion corresponding to δ L + L 0 and the parallel portion 1 on the large-diameter side. lb is a rectangular cross section having a width and a height approximately the same as that of the product at a portion corresponding to 5L '+ L0'. In addition, the curvature radius R of the corner portion is determined as described later, and in the hydraulic projection processing, the hydraulic projection processing is performed by using the head tools 14 and 15 having both the mold bodies 12 and 13 and the sealing tool. The pressing shaft at the time prevents longitudinal bending and the like from occurring, and can form a very smooth pressing of the material. Fig. 10 is a diagram showing the end face shape of the profiled tube of the present invention used when the small diameter side of the hydraulically-protruded workpiece has a rectangular cross section, and (a) is a view showing that the end portion of the small diameter side faces the shaft. The direction (11) 200417427 is only a cross section of the position (11) 200417427 from the direction of δί + L0, (c) is a cross section showing the end of the tube, and (b) is a cross section shown at these intermediate positions. That is, 'No. 10' is a figure explaining the shape of each cross section of the parallel part 1 1 a on the small-diameter side of the profiled pipe of the present invention, and the width W0 and height of the cross section from (a) to (c) H0 is almost certain. In addition, the radius of curvature R of the corner portion is changed in a stepwise manner.

As shown in Figs. 10 (a) to (c), 'the radius of curvature of the corner portion at the end of the small-diameter side is R0, and the position of the small-diameter side is only 5L + L 0 away from the position in the axial direction. If the radius of curvature of the corner is R 1 and the radius of curvature of the corner is R (x) from the position of the small-diameter side end in the axial direction away from X, these are the relations of the following formula (1) . R〇 ^ R (X) ^ R1 ... (1) In the embodiment shown in FIG. 10, although the curvature radii of the four corners in each section are the same, it is not necessary to make them the same. It is also possible to make a different radius of curvature for each corner. In more detail, the rain end portion of a simple conical tube is used as the reference perimeter, and the perimeter difference δ (1 (χ) from the position X of the tube end portion can be obtained by the following formula (2) Obtained. However, D 0 is the small diameter side outer diameter, D 0 ′ is the large diameter side outer diameter, and L T is the length of the tapered tube. 5d (X)-^ (D0, — DO) -X / LT ... (2) • 15- (12) (12) 200417427 When the end section is formed into a rectangle with a wide width W 0 and a height H0 by pre-forming, it corresponds to the above-mentioned perimeter difference 5d ( x), and as shown in Fig. 10, by changing the size of the radius of curvature R (x) of the corner portion in the axial direction position, an appropriate pre-formed shape can be determined. Fig. Π shows the hydraulic projection The figure of the end face shape of the profiled pipe of the present invention used when the large-diameter side of the processed product has a rectangular cross section. (A) is the position where the end of the large-diameter side leaves only δΐ / + L0 'in the axial direction. (C) is a cross-sectional view of the pipe end portion, and (b) is a cross-sectional view at such an intermediate position. That is, FIG. 11 illustrates the large-diameter side of the profiled pipe of the present invention. parallel The shape of each cross section of 1 1 b is almost constant in width W0 ′ and height H0 ′ in the cross section from (a) to (c). In addition, the curvature radius R ′ of the corner portion is formed in advance. As shown in Fig. 11 (a) to (c), the radius of curvature of the corner portion at the large-diameter side end is R0 ', and the large-diameter side end is only separated from the axial direction. The radius of curvature of the corner of the position at δΐ / + L0 'is R1 ′, and the radius of curvature of the corner of the position that is only X away from the end of the large-diameter side in the axial direction is R ′ (X). A relationship of the following formula (Γ) is formed: R ′ S R ′ (x) ^ RT ... (Γ) In addition, using both end portions of a simple tapered tube as a reference perimeter, The perimeter difference δ (1 (χ) of the position X can be obtained by the following formula (2 '). However, D 0 indicates the small-diameter side outer diameter and D 0' indicates -16-(13) 200417427 The outside diameter of the large diameter side and LT are the lengths of the tapered tubes. 5d (x) = 7t * (D0, —DO) eX // LT ... (2)

When the cross section of the end portion is formed into a rectangle with a wide width WO 'and a height HO', it corresponds to the perimeter difference Sd (X), and as shown in Fig. 11 ', the radius of curvature of the corner portion is made The size of R '(X) changes in the axial position, and an appropriate shape can be determined. As described above, although the case where the hydraulic protrusion processed product has a rectangular cross-section is described, it is not limited to the profiled tube of the present invention, and even a rectangular combination shape or a polygonal shape can be used, and a hydraulic protrusion can be formed. A very stable finale during processing. Fig. 12 is a view exemplifying a cross-sectional shape of a case where a hydraulically-protruded processed product has a trapezoidal section. Fig. 13 is a diagram illustrating a cross-sectional shape when the hydraulically-protruded processed product has an L-shaped cross-section. Regardless of which, an example of a cross-sectional shape formed in advance on the large-diameter side is (a) a cross-sectional view at a position away from the end of the large-diameter side by only δ L '+ L 0' in the axial direction, and (c) is a tube (B) is a cross-sectional view at such an intermediate position. Next, a hydraulic projection processing apparatus and a hydraulic projection processing method using the hydraulic projection processing apparatus of the present invention will be described with reference to the drawings. Fig. 14 is a diagram for explaining the first embodiment of the method of the present invention, and shows a case where the parallel portion of the tube end portion of the profiled material tube is formed before the hydraulic projection processing. The same (a) is a cross-sectional view showing the installation state of the mold body of the tapered pipe, and (b) is a cross-sectional view showing the state of forming a parallel part before the hydraulic protrusion processing, 17- (14) (14) 200417427, (C) is sectional drawing which shows the state after completion of a hydraulic protrusion process. Fig. 15 is a diagram showing the relationship between the upper die body on the small-diameter side and the end-bearing tool that also serves as a sealing tool, and the end of the profiled pipe, and (a) to (c) are equivalent to the above 14 (a) to (C) Figure of the figure. Fig. 16 is a diagram showing the relationship between the upper die body on the large-diameter side, the pressure roller tool that has both the sealing tool, and the end of the profiled pipe. (C) Figure of the figure. Fig. 17 is a diagram illustrating a second embodiment of the method of the present invention, and shows the pre-formed state before mounting the parallel portion of the tube end of the profiled tube to the mold body. The same (a) is a cross-sectional view showing the mounting state of the mold body of the profiled pipe, (b) is a cross-sectional view showing the state before the hydraulic protrusion processing, and (c) is a state showing the state after the hydraulic protrusion processing is completed Sectional view. Fig. 18 is a diagram illustrating a third embodiment of the method of the present invention, and shows another example of the case where it is formed in advance before attaching the parallel portion of the tube end portion of the profiled tube to the mold body. The same (a) is a cross-sectional view showing the mounting state of the mold body of the profiled pipe, (b) is a cross-sectional view showing the state before the hydraulic protrusion processing, and (c) is a state showing the state after the hydraulic protrusion processing is completed Sectional view. The hydraulic protrusion processing device of the present invention includes, for example, mold bodies 12, 13 forming upper and lower mold cavities as shown in Figs. I4, 17 and 18; and both mold bodies 12 and 13, the respective end portions of the sealing tool can be inserted into the front end of the sealing tool 14, 15. Then, the two molds -18- (15) 200417427 the main bodies 12, 13 and the pressing tools 14, 15 are configured to hold and hold both ends of the profiled tube 11 of the present invention by both of them. Further, a machining fluid injection hole may be provided in any of the above-mentioned pressing tools, and at least one of the end sides of the mold body (as shown in Figs. I 4, 17 and 18 Examples are the inner surface of both the small-diameter side and the large-diameter side) the inner surface and the outer surface of the pressing tool corresponding to the inner surface of the end surface, and the parallel portions 12a, 12b, 13a, 13b, 14a, 15a are respectively provided.

The outer parallel portions 14a and 15a of the pressing tools 14 and 15 restrict the material tube from the inner surface when pressing the shaft, and play a role of smooth deformation. In this hydraulic projection processing device, the amount of the final pinion on the small diameter portion side is δί, the amount of the final pinion on the large diameter portion side is 5L ', and the seal on the small diameter portion side must have a length of L 0 and a large diameter In the case where the length of the seal on the part side must be L 0 ′, it is provided on the end side of at least one of the two mold bodies 1 2, 1 3 (shown in FIG. 14, FIG. 17, and FIG. 18). The example is the both ends of the small-diameter side and the large-diameter side.) The length of the parallel portion 1 2 a, 1 2 b, 1 3 a, 1 3 b on the inner surface is intended to be installed on the side of the small-diameter portion. When it is set to 5L + L0 or more ', when it is installed on the large diameter part side, it is made to δ! / + L0' or more. Similarly, the lengths of the parallel sections 14a, 15a of the pressing tools 14, 15 corresponding to the parallel sections 12a, 12b, 13a, 13b provided in the mold body 1 2, 13 are intended to be provided on the side of the small-diameter section. In the case of SL + L0 or more, in the case of installation on the large-diameter portion side, it is made of δΐ / or more. However, in the hydraulic protrusion processing apparatus of the present invention, the front end portion of the final pressure tool 1 4 (1 5), which also has a small-diameter side (large-diameter side) sealing tool, must be insertable into the material forming the profiled tube 11. The simple tapered pipe PT or different-19- (16) 200417427 Shaped pipe 1 1 The small diameter side end (large diameter side end). At the same time, the parallel portion 14a (15a) must not have a gap between the foremost portion of the parallel portion 14a (I5a) and the inner surface of the profiled tube 11 at the end of the final pin.

To this end, for example, as shown in FIG. 14, a simple conical tube PT that forms the material forming the profiled tube 11 is mounted on the upper and lower mold bodies 12 and 13 before forming the hydraulic protrusion process. In the case where the parallel ends 1 1 a and 1 1 b are formed at the end of the tube and formed in the upper and lower mold bodies 2 and 1 3, a heading tool that also has a sealing tool must satisfy the following conditions a and B . The squeegee tool 14 (refer to FIG. 15) which also has a small-diameter-side sealing tool ignores the perimeter SD0 of the envelope of the local recess at the front end, and satisfies the following formula (3). SD 0 ^ (DO— 2t / cos0) χ π ... (3) However, DO: outer diameter of the small diameter part t: flesh thickness of the profiled tube 1 1 Θ = tan'1 {(DO, —DO) / (2 * LT)} LT: Length DO 'of the tapered tube PT: Roller tool 15 (refer to Figure 16) with the outside diameter of the large-diameter part and the sealing tool on the large-diameter side ignoring the local recess at the front end The perimeter SD 0 ′ of the envelope line satisfies the following formula (4). -20- (17) 200417427 SDO 'S (DO' -2t / cos0) x π ... (4) On the other hand, as shown in Figure 17 above, on the mold body installed on the upper and lower sides 1 2, 1 3 Previously, when the parallel sections 1 1 a and Π b formed at the tube end of the profiled pipe 11 were formed in advance, the heading tool that also serves as a sealing tool satisfies the following conditions C and D.

The pinch tool 1 4 (refer to FIG. 17), which also has a small-diameter-side sealing tool, has a circumference SD0 at the tip portion that satisfies the following formula (5).

The perimeter SD of the SD0S parallel portion 14a also has a large-diameter side seal tool 15 (see Fig. 17). The perimeter SD0 of the tip portion satisfies the following formula (6). SD0 '$ Circumference SD' of the parallel portion 15a ... (6) When the hydraulic protrusion processing device of the present invention is used, in the case where the hydraulic protrusion 1 is formed, for example, as in the above-mentioned first 4 (a) As shown in the figure, the simple tapered tube PT of the material of the profiled tube 11 of the present invention is mounted in a pair of mold bodies 12 and 13 of a hydraulic projection processing apparatus. Next, before the hydraulic protrusion processing, the pinch tools 14 and 15 both serving as a sealing tool are moved in the axial direction, and as shown in FIG. 14 (b), they are held in the mold bodies 12, 13 and the pinch tools 14, 15 The parallel ends 11a and lib are formed at the pipe end or both ends of the tapered pipe PT, and are shaped into the -21 · (18) (18) 200417427 profiled pipe 11 of the present invention. At this time, it is not necessary to make the timing of the pressing of the special-shaped material tube 11 by the pressing tools 14 and 15 the same. For example, the pressing of the pressing tool 14 may be started at the stage of pressing the pressing tool 15 to some extent. Therefore, it is only necessary that the special-shaped material tube 11 is selected with a stable pressing shaft timing in the mold bodies 1 2 and 1 3. In this case, if the above-mentioned dimensions are made into a standard and the dimensional design of the mold main bodies 12, 13 and the sealing tools 14 and 15 is designed, the pressing tools 1 4 and 15 can be smoothly inserted into the tapered tube. PT. In the state of Fig. 14 (b), as shown in Figs. 15 (b) and 16 (b), the two ends of the tapered pipe ρ τ are formed on the small diameter side. More than L0, it is expected to be 5L + L0 or more, and the parallel portions 1 1 a, 1 1 b with a length greater than or equal to L0 ′ on the large-diameter side, and the shaped pipe 11 of the present invention is obtained. Thereafter, an internal pressure is applied to the profiled tube 11 in a state where the sealing of the processing fluid is completely performed. Secondly, while increasing the internal pressure of the processing fluid, the pressing tools 14 and 15 are moved in the axial direction, and hydraulic protrusion processing is performed. As shown in the above-mentioned FIG. 14 (c), the hydraulic protrusion is formed by the method of the present invention. The processed product 17 is produced by mounting the profiled tube 11 of the present invention on the hydraulic protruding processing apparatus of the present invention as a result of forming a compactable shaft. The hydraulic protruding work 17 can obtain a larger pipe expansion rate than before. In addition, the end face of the hydraulic protruding work 17 is as shown in the above 4 (b), because it is perpendicular to the axis, it can also be formed easily -22- (19) 200417427 ... The method of joining and welding of components, and it can be positioned. Fig. 19 is a configuration example showing the inner cavity of the parallel portion on the radial side of the fourth embodiment of the method of the present invention, showing a monotonically increasing large-diameter end as the axial direction. (A) is a cross-sectional view showing a state of mounting on the mold body, (b) is a cross-sectional view showing a state where a parallel portion is formed before processing, and (c) is a cross-sectional view showing a state after completion of processing. The embodiment shown in Fig. 19 is different from the embodiment shown in Figs. 14 and 18 described above. That is, the two molds 13 have the parallel portions 12a, 12b, 13a, and 13b at both end portions, but the inner cavity of the parallel portion on the large-diameter side of the two mold bodies 1 2, 1 3 is the first one described above. In the example shown in FIG. 4 and the like, the diameter is narrowed, and the inner diameter ends of the parallel portions 12 b and 1 3 b are used as a reference and monotonously decrease in the axial direction. In the configuration example shown in FIG. 19, the resistance of the pressing shaft is smaller than that of the meta-alloy (meta 1 Π 〇w). Therefore, the forming envelope (the tube expansion limit) can be enlarged. Therefore, in the hydraulic projection of the present invention, It is hoped that the cavity shapes of the mold bodies 12 and 13 are designed to be first shapes. On the other hand, among automobile parts, the end surface of a product has a cross section that is close to a rectangle or a combination of rectangles, or a shape such as a polygon. As described above, the above-mentioned Fig. 18 is a diagram showing the insertion of the insert in the ninth (a), and the hydraulic pressure of the tapered pipe protruding from the large reference is shown in the hydraulic pressure of Fig. 17 and the body 12 although it is not partly 12b, 13b. The sex hole is large, because the possible shapes are shown in the figure. The surface shape shown in Figure 9 is a complex shape. -23- (20) (20) 200417427r + Invented profiled tube] 1 In the figure of the embodiment, when this plus Γ is used, the special-shaped material pipe 11 shown in FIG. 9 (a) is installed in the mold body 1 2, 1 3. FIG. 9 (b) shows an enlarged view of the small-diameter side of the profiled pipe 1 1 of the present invention. On the other hand, the cross-sectional shape of the small-diameter side parallel portion 1 1 a is as shown in the above-mentioned FIG. 10. The shaped tube 11 having such a cross-sectional shape is formed by using the pressing tools 14 and 15 which also have a sealing tool showing an example of the present invention. That is, Fig. 9 (c) shows a parallel portion 1 having a wide-diameter WO-2t, a height H0-2t, and a radius of curvature R1 of the corner portion, although the final head tool 14 which also has a small-diameter side sealing tool is shown. 4 a. From the state shown in Fig. 18 (a) above, the end rolling tools 14, 15 are pushed into the ends, and at the stage of Fig. 18 (b), the forming of the end of the profiled pipe is completed, and At the same time as the profiled tube 11 shown in FIG. 9 (b) is obtained, the sealing of the working fluid supported by the internal pressure is completely performed. Thereafter, while the internal pressure of the working fluid is increased, the pressing tool 1 4 '1 5 is moved in the axial direction, and a hydraulic protruding processed product 17 of the method of the present invention that performs hydraulic protruding processing can be obtained. Further, the parallel end 1 1 a '1 1 b of the pipe end, which is formed before the hydraulic protrusion processing, may be formed in advance or may be performed at a previous stage. It can be performed by an existing processing method such as diameter reduction processing, hole expansion processing, swaging processing, and spinning processing, or a combination thereof. Fig. 20 is a diagram showing an example of the structure of a final head tool of a sealing tool of a component, which also has a structure of a hydraulic projection processing device of the present invention. (24) (21) 200417427 (A) shows the configuration example of the case where the end faces 14b and 15b are in contact with the end faces of the profiled tube 11 and (b) the protrusions 14c and 15c are given to the same end faces 14b and 1b. (C) is a configuration example in which a step difference 14d, 15d is given to the boundary portion between the end faces 14b, 15b of the parallel portions 14a, 15a, and (d) is a configuration in which a 0-ring 18 is given to the parallel portions 14a, 15a example.

The configuration example of any one of the 20th (a) to (d) also satisfies the relationship between the parallel portions 14a, 15a and the perimeter of the front end shown in the above expressions (3) to (6). The above embodiment is a specific example of the present invention. Although the shape of the cavity of the mold body 1 2, 1 3 also shows an example of a relatively simple shape, of course, even if it represents the complexity of the three-dimensional of ordinary automobile parts The shape is also available.

In addition, in the above-mentioned embodiment, although the final axis is shown from both the large-diameter side and the small-diameter side, the present invention is applicable to one side and the other side is performed by the prior art. For example, it is also possible to use an unpressurized system as shown in the above-mentioned first figure. The effect of the final axis is changed according to the shape of the product. Therefore, it is possible to determine the applicable scope of the present invention according to the situation. In the above-mentioned embodiment, although the material of the special-shaped tube 11 is mainly used to describe the simple tapered tube Shape, but when a simple conical tube shape is combined and welded, or when a tapered tube is combined with a normal straight tube, both ends are compatible with a part of a simple conical tube. Since it is similar, it can be suitably used as the material of the profiled tube 11 of this invention. -25- (22) (22) 200417427 [Industrial availability] The special-shaped material pipe for hydraulic protrusion processing of the present invention has a circumference that gradually increases or decreases from one side to the other in the axial direction. And, a parallel portion is formed on at least one of the end sides. In the processing device and processing method using the profiled tube, parallel portions are respectively provided on the inner surface of the end side of at least one of the upper and lower mold bodies and the outer surface of the pressing tool corresponding to the inner surface of the end side, and are mounted on In the mold, it is possible to process the combination of the internal pressure load and the pressing shaft in the axial direction. As a result, the hydraulically-protruded product to which the hydraulically-protruding process is performed can be formed to obtain a pipe expansion ratio larger than that in the past. In addition, it is easy to perform joining with other parts, and it is suitable for use in automobiles, and is also applicable to a wide range of industrial machinery. [Brief description of the drawings] Fig. 1 is a diagram illustrating the final process among the processes of hydraulic protrusion processing using a conventional linear pipe to obtain a product. Fig. 2 is a diagram for explaining a problem that occurs when a conventional condensing tool for straight rods is used and a conventional conical tube is compressed. Fig. 3 is a diagram illustrating a conventional hydraulic projection processing process using a conical tube. (A) shows a state before processing; (b) shows a state before an internal pressure load is applied; and (c) shows a state Status when processing is complete. Fig. 4 is a diagram explaining a problem in a case where a hydraulically-protruded processed product having a rectangular cross section is joined. (A) shows the shape of a hydraulic-protruded processed product using a conventional tapered tube. (B) shows the present invention. The shape of the hydraulically-protruded workpiece is shown in (c). -26- (23) 200417427 Fig. 5 is a sectional view showing an example of the shape of a tapered material tube constituting the special-shaped material tube for hydraulic protrusion processing of the present invention. Fig. 6 is a diagram illustrating the overall configuration of a profiled pipe according to the present invention. (A) shows an example in which parallel portions having a circular cross section are formed at both ends of a tapered portion having a circular cross section, and (b) shows an example having An example of a parallel section having a rectangular cross section is provided at both ends of the tapered section of the rectangular cross section.

Fig. 7 is a diagram illustrating the overall configuration of another profiled pipe according to the present invention, and shows an example having a transition portion between a parallel portion on the large diameter side and a central tapered portion. FIG. 8 is a diagram illustrating a method of manufacturing a profiled tube of the present invention having parallel portions at a large-diameter end portion. (A) is an overall perspective view, (b) is an expanded view, and (c) is an approximate view. Figure (b) shows a trapezoidal shape of the developed view. FIG. 9 is a view showing another embodiment of the profiled tube using the present invention and a finale tool thereof. (A) is an enlarged view of the finale tool having an overall perspective view, and (b) is a side having a small diameter. (C) An enlarged view of a finalizer tool that employs such a small-diameter-side sealing tool. Fig. 10 is a diagram showing the end face shape of the profiled tube of the present invention used when the small diameter side of the hydraulically protruded workpiece has a rectangular cross section. (A) is a view from the end portion of the small diameter side toward the axial direction. The cross section _ from the position of δί + L0, (c) is a cross-sectional view of the tube end, and (b) is a cross-sectional view at such an intermediate position. FIG. 11 is a diagram showing the shape of the end face of the profiled tube of the present invention used in a case where a rectangular cross-section -27- (24) 200417427 is provided on the large diameter side of the hydraulically protruded workpiece. (A) A cross-sectional view at a position where the radial-side end portion is separated from δ L ′ + L 0 ′ in the axial direction, (c) is a cross-sectional view of the pipe end portion, and (b) is a cross-sectional view at such an intermediate position. Fig. 12 is a view exemplifying a cross-sectional shape of a case where a hydraulically-protruded processed product has a trapezoidal section.

Fig. 13 is a diagram exemplifying the cross-sectional shape of the case where the hydraulically-protruded processed product has an L-shaped cross section. Fig. 14 is a diagram for explaining the first embodiment of the method of the present invention, and shows the case where the parallel portion of the tube end portion of the profiled material tube is formed before the hydraulic projection processing. (A) is a cross-sectional view showing the mounting state of the mold body to the tapered pipe, (b) is a cross-sectional view showing a state where a parallel portion is formed before the hydraulic protrusion process, and (c) is a view showing the completion of the hydraulic protrusion process A sectional view of the state. Fig. 15 is a diagram showing the relationship between the upper die body on the small-diameter side and the "end-of-line tool that also serves as a sealing tool and the end of the profiled pipe" (a) to (c) are equivalent to the above-mentioned 14 (a) to ( c) Figure of the graph. Fig. 16 is a diagram showing the relationship between the upper die body on the large-diameter side and the end-of-line tool that also serves as a sealing tool, and the profiled pipe end. (A) to (c) are equivalent to the above-mentioned 14 (a) to (c ) Figure of the picture. Fig. 17 is a view illustrating a second embodiment of the method of the present invention, and shows a state in which the parallel portion of the tube end portion of the profiled tube is formed before mounting on the mold body. (A) is a cross-sectional view of the mounting state of the mold body showing the special-shaped tube, (b) is a cross-section showing the state before the hydraulic protrusion processing-28- (25) (25) 200417427 surface view, (c) This is a cross section showing the state after the completion of the hydraulic protrusion process. 〇 Figure 18 is a diagram illustrating the third embodiment of the method of the present invention. Before mounting the parallel portion of the tube end of the profiled tube to the mold body, Other examples of pre-formed cases are shown. (A) to (c) are the same as those in Fig. 17 described above. Fig. 19 is an explanatory view showing a fourth embodiment of the method of the present invention. The cavity on the inside of the parallel portion on the large-diameter side shows a configuration example that monotonously increases in the axial direction using the large-diameter end as a reference. (A) to (c) are the same as in the case of FIG. 17 described above. Fig. 20 is a diagram showing an example of the configuration of a head tool of a sealing tool that also has a constituent member of the hydraulic projection processing apparatus of the present invention. [Explanation of symbols] 1, 2 ... Moulds 3, 1 6 ... Injection holes 4, 5, 6, 7, 14, 15 ... Finale tool 1 1 ... Special-shaped material tubes 11a, lib, 12a, 12b, 13a, 13b, 14a, 15a ... Parallel sections 1 1 c ... Transfer sections 12, 13 ... Mold body 14 b, 15b ... End faces 14c, 15c ... Protrusions 1 4d, 1 5d ... Stage difference 29 -(26) 200417427 1 7 ... Hydraulic protrusion 1 8 ... ο -30

Claims (1)

(1) 200417427 Scope of patent application 1 · A special-shaped pipe for hydraulic protrusion processing belongs to the special-shaped pipe supplied for hydraulic protrusion processing, which is characterized by: from one of the axes to the other The diameter has a perimeter that gradually increases or decreases, and a parallel portion is formed on at least one of the end sides. 2 · The special-shaped material pipe for hydraulic protrusion processing according to item 1 of the scope of the patent application, wherein the length of the parallel portion is made by the amount of the pressing shaft performed by the hydraulic protrusion processing and the seal during the hydraulic protrusion processing. The total required length or more. 3. The special-shaped material pipe for hydraulic protrusion processing according to item 1 or 2 of the scope of patent application, wherein the special-shaped material pipe manufactured by supplying the hydraulic protrusion processed product having a rectangular cross section or a polygonal cross section is provided in the The curvature radius R of the corner portion of the parallel portion changes in accordance with a change in the difference in the perimeter of the profiled tube corresponding to the axial distance of the tube end portion. 4. A hydraulic protruding processing device, characterized by: It has: a pair of mold bodies, and the special-shaped material tube described in the scope of patent application items 1 to 3 is sandwiched with the mold body and should be held '; and the front end is inserted at both ends of the mold body In any of the pressing tools of the sealing tool of the part, a machining fluid injection hole can be provided in any of the pressing tools, an inner surface of an end side of at least one of the mold bodies, and the pressing tool corresponding to the inner surface of the end surface. The outer portions of the outer portions are respectively provided with parallel portions. 5. The hydraulic protrusion processing device -31-(2) (2) 200417427 as described in item 4 of the scope of the patent application, wherein the amount of the pinch on the side of the small diameter portion is SL and the amount of the pinch on the side of the large diameter portion is δ! / When the seal on the small-diameter portion side must have a length of L0 and the seal on the large-diameter portion side must have a length of L0 ', the length of the parallel portion provided on the small-diameter portion side of the mold body is 5L + L0 or more, the length of the parallel portion provided on the large-diameter portion side of the mold body is 5L '+ L0' or more, and the length of the parallel portion provided on the small-diameter portion side of the finalizing tool is + L0 or more, provided at The length of the parallel portion on the large-diameter portion side of the final tool is L0 ′ or more. 6. A hydraulic protrusion processing method, characterized by adopting a hydraulic protrusion processing device as described in item 4 or 5 of the scope of patent application, and manufacturing as described in any one of the scope of patent applications 1 to 3 After the special-shaped material tube is formed, the above-mentioned special-shaped material tube is subjected to a combined hydraulic pressure load and squeezed hydraulic protrusion process. 7 · A hydraulically-protruding processed product, characterized in that: the special-shaped tube women's clothing as described in any one of the scope of the patent application Nos. ～ 3 is applied to the hydraulic pressure as described in the patent application's scope 4 or 5 In the mold of the protrusion processing device, the above-mentioned profiled tube is subjected to a hydraulic protrusion processing combining combined internal pressure load and extrusion.