WO2016136259A1 - Produit formé de métal comprenant une partie tubulaire présentant une fente et procédé de fabrication associé, et dispositif de fabrication et matrice utilisés pour celui-ci - Google Patents

Produit formé de métal comprenant une partie tubulaire présentant une fente et procédé de fabrication associé, et dispositif de fabrication et matrice utilisés pour celui-ci Download PDF

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Publication number
WO2016136259A1
WO2016136259A1 PCT/JP2016/001012 JP2016001012W WO2016136259A1 WO 2016136259 A1 WO2016136259 A1 WO 2016136259A1 JP 2016001012 W JP2016001012 W JP 2016001012W WO 2016136259 A1 WO2016136259 A1 WO 2016136259A1
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WO
WIPO (PCT)
Prior art keywords
mold
cross
sectional
manufacturing
slit
Prior art date
Application number
PCT/JP2016/001012
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English (en)
Japanese (ja)
Inventor
佐藤　雅彦
吉田　亨
Original Assignee
新日鐵住金株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 新日鐵住金株式会社 filed Critical 新日鐵住金株式会社
Priority to EP16755009.4A priority Critical patent/EP3263240B1/fr
Priority to JP2017501946A priority patent/JP6531818B2/ja
Priority to US15/550,813 priority patent/US20180021829A1/en
Priority to RU2017133119A priority patent/RU2683673C2/ru
Priority to KR1020177026533A priority patent/KR101983929B1/ko
Priority to BR112017016143-5A priority patent/BR112017016143A2/pt
Priority to CA2975861A priority patent/CA2975861C/fr
Priority to MX2017010764A priority patent/MX2017010764A/es
Priority to CN201680011678.7A priority patent/CN107427879A/zh
Publication of WO2016136259A1 publication Critical patent/WO2016136259A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/01—Bending sheet metal along straight lines, e.g. to form simple curves between rams and anvils or abutments
    • B21D5/015—Bending sheet metal along straight lines, e.g. to form simple curves between rams and anvils or abutments for making tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/0815—Making tubes with welded or soldered seams without continuous longitudinal movement of the sheet during the bending operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/10—Die sets; Pillar guides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/01—Bending sheet metal along straight lines, e.g. to form simple curves between rams and anvils or abutments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
    • B21D5/10—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles for making tubes

Definitions

  • the present invention relates to a metal molded product including a tubular portion having a slit, a method for manufacturing the metal molded product, a manufacturing apparatus and a mold used therefor.
  • UO forming is known as a typical method for manufacturing a tubular part using a metal plate as a material (for example, Patent Documents 1 and 2).
  • Patent Document 3 discloses a method of forming a hollow shape having slots in the vertical direction.
  • 3 and 4 of Patent Document 3 disclose a method using a core (core 11) having a blade for forming a slot.
  • the manufacturing method of Patent Document 3 is based on the premise that the slot is closed and welded after molding. For this reason, the accuracy of the interval between the slots and the accuracy of the shape before welding are not taken into consideration.
  • the amount of spring back also changes, so that the slot spacing varies. Therefore, when changing the material and thickness of the metal plate, it is necessary to modify the mold in order to adjust the slot interval.
  • Patent Document 1 discloses a method of forming a tubular member having a square cross section by bending a plate material.
  • the mold used in this method has an upper mold, a lower mold, and a side die.
  • the side die is a die for pressing the side portion of the plate material so that two end edges facing each other are brought close to each other.
  • the tubular member formed by this method is welded at the butt after forming. Therefore, the control of the distance between the two edges is not sufficiently considered.
  • roll forming is also known as a method for producing tubular parts (for example, Patent Document 4).
  • a tubular part having a complicated shape such as a modified cross-sectional tube whose cross-sectional shape changes in the longitudinal direction.
  • a press brake process As a bending process for a metal plate, a press brake process is known (for example, Patent Document 5). It is also conceivable to form a tubular part having a gap at the butt portion by bending with a press brake. However, in press brake machining, it is difficult to reduce the gap between the butted portions.
  • a core may be used during O molding.
  • this method has a problem that spring back is large because it is formed by simple bending. Therefore, also in this case, it is difficult to control the gap between the butted portions.
  • Patent Document 6 discloses a method of manufacturing a hollow profile material from a cut blank using UO molding technology.
  • a hollow profile material that is closed by bringing two opposed edges of a cut blank into contact with each other is formed. At this time, the circumferential length of the cut blank is made longer by a predetermined surplus length than the required forming length. The surplus length is at least 1% to 10%.
  • Patent Document 6 discloses that the region of the hollow profile material in contact with the edge joint portion is at least partially compressed in the circumferential direction.
  • Patent Document 6 describes that the above manufacturing method is carried out using UO molding technology.
  • Patent Document 6 does not specifically describe how to implement the manufacturing method. That is, Patent Document 6 does not disclose how the hollow profile material is compressed in the circumferential direction using the UO molding technique. Furthermore, the method of Patent Document 6 does not assume that the width of the slit is arbitrarily controlled.
  • one of the objects of the present invention is to provide a manufacturing method capable of accurately forming a metal molded product including a tubular portion having slits and controlling the interval between the slits.
  • the method according to an embodiment of the present invention is a manufacturing method for manufacturing a metal molded article including a tubular portion having a slit.
  • this manufacturing method (i) a step of forming a U-shaped portion having a U-shaped cross section by deforming a metal plate, and (ii) two end portions of the U-shaped portion have protrusions.
  • the cross-sectional circumferential length LH of the tubular portion is made shorter than the cross-sectional length LU of the U-shaped portion.
  • the metal molded product of one embodiment of the present invention is a metal molded product including a tubular portion having a slit.
  • the variation S of the Vickers hardness in the thickness direction in the cross section of the tubular portion is expressed by the following formula, the average value in the circumferential direction of the variation S is less than 0.4.
  • S (Bmax ⁇ Bmin) / Bmax
  • Bmin is the minimum value of the Vickers hardness in the thickness direction in the cross section.
  • Bmax is the maximum value of Vickers hardness in the thickness direction in the cross section.
  • the manufacturing apparatus is a manufacturing apparatus for manufacturing a metal molded product including a tubular portion having a slit.
  • This manufacturing apparatus includes a mold and a moving mechanism for moving the mold.
  • the mold includes a first mold including a protrusion for forming the slit, and a second mold.
  • the first and second molds are respectively first and second pressing surfaces for deforming a U-shaped portion having a U-shaped cross section to form a cylindrical portion having a gap serving as the slit.
  • the mold has a configuration for pressing the outer peripheral surface of the cylindrical portion so that the cross-sectional peripheral length of the cylindrical portion is shortened.
  • a mold according to an embodiment of the present invention is a mold for manufacturing a metal molded product including a tubular portion having a slit.
  • the mold includes a first mold including a protrusion for forming the slit, and a second mold.
  • the first and second molds are respectively first and second pressing surfaces for deforming a U-shaped portion having a U-shaped cross section to form a cylindrical portion having a gap serving as the slit. including.
  • the mold has a configuration for pressing the outer peripheral surface of the cylindrical portion so that the cross-sectional peripheral length of the cylindrical portion is shortened.
  • the present invention it is possible to accurately form a metal molded product including a tubular portion having slits, and to control the interval between the slits.
  • ADVANTAGE OF THE INVENTION According to this invention, the metal molded product containing the tubular part in which the slit was formed accurately is obtained. Furthermore, according to this invention, the manufacturing apparatus and metal mold
  • FIG. 1 schematically shows a cross section of an example of a metal molded product of the present invention.
  • FIG. 2A is a cross-sectional view schematically showing an example of one step of the manufacturing method of the present invention.
  • FIG. 2B is a cross-sectional view schematically showing an example of one process following FIG. 2A.
  • FIG. 2C is a cross-sectional view schematically showing a U-shaped portion formed in the process of FIGS. 2A and 2B.
  • FIG. 3A is a cross-sectional view schematically showing an example of a mold used in the manufacturing method of the present invention.
  • FIG. 3B is a cross-sectional view schematically showing an example of a manufacturing process using the mold of FIG. 3A.
  • FIG. 3C is a cross-sectional view showing an example of a step following the step of FIG. 3B.
  • FIG. 3D is a cross-sectional view showing an example of a step following the step of FIG. 3C.
  • FIG. 3E is a cross-sectional view showing an example of a step following the step of FIG. 3D.
  • FIG. 3F is a cross-sectional view schematically showing an example of a metal molded product manufactured in the steps of FIGS. 3B to 3E.
  • FIG. 4A is a cross-sectional view schematically showing an example of a mold used in the manufacturing method of the present invention.
  • FIG. 4B is a cross-sectional view schematically showing an example of a manufacturing process using the mold of FIG. 4A.
  • FIG. 4C is a cross-sectional view showing an example of a step following the step of FIG. 4B.
  • FIG. 4D is a cross-sectional view showing an example of a step following the step of FIG. 4C.
  • FIG. 4E is a cross-sectional view showing an example of a step following the step of FIG. 4D.
  • FIG. 4F is a cross-sectional view schematically showing an example of a metal molded product manufactured in the steps of FIGS. 4B to 4E.
  • FIG. 5A is a cross-sectional view schematically showing an example of a mold used in the manufacturing method of the present invention.
  • FIG. 5B is a cross-sectional view schematically showing an example of a manufacturing process using the mold of FIG. 5A.
  • FIG. 5C is a cross-sectional view showing an example of a step following the step of FIG. 5B.
  • FIG. 5D is a cross-sectional view showing an example of a step following the step of FIG. 5C.
  • FIG. 5E is a cross-sectional view showing an example of one process following the process of FIG. 5D.
  • FIG. 5F is a cross-sectional view schematically showing an example of a metal molded product manufactured in the steps of FIGS. 5B to 5E.
  • FIG. 6A is a cross-sectional view schematically showing an example of a mold used in the manufacturing method of the present invention.
  • 6B is a cross-sectional view schematically showing an example of a manufacturing process using the mold of FIG. 6A.
  • FIG. 6C is a cross-sectional view showing an example of a step following the step of FIG. 6B.
  • FIG. 6D is a cross-sectional view showing an example of a step following the step of FIG. 6C.
  • FIG. 6E is a cross-sectional view showing an example of one process following the process of FIG. 6D.
  • FIG. 6F is a cross-sectional view schematically showing an example of a metal molded product manufactured in the steps of FIGS. 6B to 6E.
  • FIG. 7 is a cross-sectional view schematically showing another example of the mold of the present invention.
  • FIG. 8 is a cross-sectional view showing another example of the mold of the present invention and an example of a tubular portion formed thereby.
  • FIG. 9A is a diagram schematically showing an example of a metal molded product of the present invention.
  • FIG. 9B is a diagram schematically illustrating another example of the metal molded product of the present invention.
  • FIG. 9C is a diagram schematically illustrating another example of the metal molded product of the present invention.
  • FIG. 9D is a diagram schematically illustrating another example of the metal molded product of the present invention.
  • FIG. 9E is a diagram schematically illustrating another example of the metal molded product of the present invention.
  • FIG. 10A schematically shows one step in the method for producing the tubular member of Comparative Example 1.
  • FIG. 10B schematically shows one process following FIG. 10A.
  • FIG. 11A schematically shows one step in the method for producing the tubular member of Comparative Example 2.
  • FIG. 10A schematically shows one step in the method for producing the tubular member of Comparative Example 1.
  • FIG. 10B schematically shows one process following FIG. 10A.
  • FIG. 11A schematically shows one step in
  • FIG. 11B schematically shows one process following FIG. 11A.
  • 12A is a graph showing strain distribution in the plate thickness direction for the tubular members of Example 1, Comparative Example 1, and Comparative Example 2.
  • FIG. 12B is a graph showing the strain distribution in the circumferential direction for the tubular members of Examples 2 to 4 and Comparative Example 2.
  • FIG. 13 is a graph showing the relationship between the average value of the variation S in the circumferential direction and the reduction rate of the uniaxial compression strength.
  • FIG. 14A is a diagram illustrating an example of the operation of an example of the manufacturing apparatus of the present invention.
  • FIG. 14B is a diagram illustrating an example of an operation following FIG. 14A.
  • FIG. 14C is a diagram illustrating an example of an operation following FIG. 14B.
  • FIG. 14D is a diagram illustrating an example of an operation following FIG. 14C.
  • FIG. 15A is a diagram illustrating an example of the operation of another example of the manufacturing apparatus of the present invention.
  • FIG. 15B is a diagram illustrating an example of an operation following FIG. 15A.
  • FIG. 15C is a diagram illustrating an example of an operation following FIG. 15B.
  • FIG. 15D is a diagram illustrating an example of an operation following FIG. 15C.
  • the production method of the present invention is a method for producing a metal molded article including a tubular portion having a slit.
  • the matters described in the manufacturing method of the present invention can be applied to the metal molded product, the manufacturing apparatus, and the mold of the present invention.
  • the metal molded product may include a portion other than the tubular portion having a slit. Or the metal molded product may be comprised only by the tubular part which has a slit.
  • the metal molded product in that case is a tubular molded product having a slit.
  • An example of the metal molded product to be manufactured will be described later.
  • the production method of the present invention includes steps (i) and (ii) described below.
  • a U-shaped section having a U-shaped cross section is formed by deforming the metal plate.
  • molding There is no limitation in particular in process (i), You may apply U shaping
  • the U-forming method is not particularly limited as long as the metal plate can be formed so that the cross section is U-shaped. Examples of the U molding method include press molding and roll molding. U molding may be performed in a plurality of steps. Further, before the U forming, a process of bending the end of the metal plate (a process such as so-called C forming) may be performed. Further, trimming (cutting) of the U-shaped portion may be performed after the U molding.
  • the cross section of the tubular portion means a cross section in the circumferential direction of the tubular portion.
  • the cross section of the tubular portion means a cross section in a direction perpendicular to the axial direction (usually the longitudinal direction) of the tubular portion.
  • the pressing surface of the mold means a surface of the mold that comes into contact with the outer peripheral surface of the cylindrical portion (or the tubular portion).
  • the metal plate formed by the manufacturing method of the present invention may be hereinafter referred to as “blank”.
  • the metal plate (blank) is not particularly limited as long as it can be molded.
  • the metal plate include a steel plate, such as a hot rolled steel plate, a cold rolled steel plate, and a plated steel plate.
  • examples of the metal plate include a metal plate (so-called tailored blank) obtained by connecting a plurality of metal plates.
  • the tailored blank may be one obtained by joining a plurality of metal plates in the axial direction of the obtained tubular portion, or may be one obtained by joining a plurality of metal plates in the circumferential direction of the obtained tubular portion. .
  • the difference thickness steel plate from which a board thickness differs according to a place may be used.
  • the laminated plate include those obtained by superimposing a plurality of metal plates and those obtained by superimposing a non-metallic material on a metal plate. That is, the metal molded product may include a material other than the metal plate.
  • the metal plate may be a thin metal plate or a high-tensile steel plate (so-called high-tensile material). Since these tend to have large springbacks, the present invention is particularly useful.
  • the thin metal plate include those having a ratio of the plate thickness to the equivalent diameter of the metal plate of 10% or less.
  • the equivalent diameter is a value obtained by dividing the circumferential length of the tubular portion by 3.14.
  • the tensile strength of the high-tensile material is preferably 300 MPa or more, and may be 440 MPa or more (for example, 490 MPa or more or 780 MPa or more). There is no particular limitation on the upper limit of the tensile strength, and it may be 2000 MPa or less.
  • the material of the metal plate is not particularly limited as long as it can be molded.
  • Examples of the material of the metal plate include Fe-based, Al-based, Cu-based, and Ti-based metals.
  • the thickness of the metal plate is not particularly limited as long as it can be formed.
  • the thickness of the metal plate is selected in consideration of the material of the metal plate, the shape of the metal molded product, the use of the metal molded product, and the like.
  • the thickness of the metal plate may be in the range of 0.4 to 5 mm (for example, the range of 0.5 to 3 mm, the range of 1 to 3 mm, etc.).
  • the shape of the metal plate is selected according to the shape of the target metal molded product. As will be described later, in the manufacturing method of the present invention, the cross-sectional circumferential length LH of the tubular portion is made shorter than the cross-sectional length LU of the U-shaped portion.
  • the width W of the portion that becomes the tubular portion of the metal plate is determined in consideration of the compression rate C described later.
  • step (ii) the U-shaped portion is deformed using a mold having a protruding portion so that the two end portions of the U-shaped portion sandwich the protruding portion, thereby forming a tubular portion having a slit.
  • step (ii) the cross-sectional circumferential length LH of the tubular portion is made shorter than the cross-sectional length LU of the U-shaped portion. Thereby, the metal plate constituting the tubular portion is compressed in the circumferential direction. As a result, the spring back of the tubular portion is suppressed, and the slit interval can be controlled with high accuracy.
  • a gap between two end portions (two end portions of the U-shaped portion) that are abutted with each other sandwiching the protrusion portion becomes a slit. That is, a metal molded product including a tubular part having a slit is manufactured by the step (ii). Of course, you may further process the metal molded product obtained by process (ii).
  • the difference between the cross-sectional circumferential length LH of the tubular part and the cross-sectional length LU of the U-shaped part is preferably 0.2% or more of the cross-sectional length LU of the U-shaped part. That is, the cross-sectional length LU of the U-shaped part and the cross-sectional peripheral length LH of the tubular part preferably satisfy the expression 0.2 ⁇ 100 ⁇ (LU ⁇ LH) / LU. If this difference is too small, the effect of suppressing the spring back and the effect of accurately forming the tubular portion may not be obtained sufficiently.
  • the value “100 ⁇ (LU ⁇ LH) / LU” may be referred to as the compression ratio C (%) of the tubular portion.
  • the compressibility C of the tubular portion may be 0.5% or more.
  • the compression ratio C may be 2% or less, or less than 1%.
  • the compression rate C is preferably less than 1%.
  • the equation 0.2 ⁇ 100 ⁇ (LU ⁇ LH) / LU ⁇ 1 is satisfied.
  • the difference between the sectional peripheral length LH of the tubular portion and the sectional length LU of the U-shaped portion may be 8 t or less.
  • the difference between the cross-sectional circumferential length LH of the tubular portion and the cross-sectional length LU of the U-shaped portion may be 0.1 t or more.
  • the compression ratio C is 0.2% or more, and the difference between the cross-sectional circumferential length LH and the cross-sectional length LU is 8 t or less. In another preferred example, the compression ratio C is 0.2% or more and 2% or less.
  • the compression ratio C is preferably 0.2% or more and less than 1% (for example, 0.2% or more and less than 0.5%).
  • the compressibility C may be determined in consideration of the yield stress ⁇ (MPa) and the plate thickness t (mm) of the metal plate (blank) constituting the tubular portion.
  • the compression rate C (%) described above may satisfy the following expression.
  • the lower limit of the compression rate C any of the above-described lower limits may be adopted.
  • the thickness of the metal plate in the case where the following formula is satisfied is not limited, but may be in the above-described range (for example, a range of 0.4 to 5 mm).
  • Step (ii) may include the following steps (ii-1) and (ii-2).
  • step (ii-1) the U-shaped portion is deformed using a mold so that the two end portions of the U-shaped portion sandwich the protrusion, thereby forming a tubular portion that becomes a tubular portion.
  • the tubular portion is a tubular portion precursor finally obtained in the step (ii), and can be rephrased as a “first tubular portion” or a “tubular portion precursor”.
  • step (ii-2) the outer circumferential surface LT of the cylindrical portion is shortened by pressing the outer peripheral surface of the cylindrical portion with the two end portions sandwiching the protruding portion of the mold.
  • the cross-sectional circumferential length LH of the tubular portion is made shorter than the cross-sectional length LU of the U-shaped portion.
  • the metal plate constituting the tubular portion is compressed in the circumferential direction by the step (ii-2).
  • Example (A), Example (B), and Example (C) of step (ii) will be described below.
  • Examples (A) and (B) are examples including steps (ii-1) and (ii-2).
  • the mold (a) used in Example (A) has the following configurations (a-1), (a-2), and (a-3).
  • the mold (a) includes a first mold having a protrusion and a second mold.
  • the first and second molds each include first and second pressing surfaces for deforming the U-shaped portion to form a cylindrical portion.
  • At least one mold selected from the first mold and the second mold can be separated into a plurality of mold members.
  • both the first and second molds may be separable.
  • only the first mold may be separable, or only the second mold may be separable.
  • both the first and second molds are separable, it is easy to finely adjust the circumferential length LH of the tubular portion, and as a result, the variation in compressive stress acting on the tubular portion can be further reduced. As a result, the slit can be formed with higher accuracy.
  • the first mold is separable, the first mold is separable into a first mold member and a second mold member.
  • the protrusion may be constituted by a first protrusion included in the first mold member and a second protrusion included in the second mold member.
  • step (ii-1) of Example (A) the cylindrical portion is formed by deforming the U-shaped portion using the mold (a) in a state where a plurality of mold members are separated.
  • step (ii-2) the outer peripheral surface of the cylindrical portion is pressed by bringing a plurality of mold members closer to each other, thereby shortening the cross-sectional peripheral length LT of the cylindrical portion.
  • the metal plate which comprises a tubular part is compressed to the circumferential direction.
  • the mold (a) moves only in the vertical direction in the step (ii-1), and the mold (a) moves only in the horizontal direction in the step (ii-2).
  • the upper mold is moved to the bottom dead center in the step (ii-1).
  • step (ii-2) the plurality of separated mold members are moved in the horizontal direction.
  • the mold (b) used in Example (B) has the following configurations (b-1), (b-2), and (b-3).
  • the mold (b) includes a first mold having a protrusion and a second mold.
  • Each of the first and second molds includes first and second pressing surfaces for deforming the U-shaped portion to form a cylindrical portion.
  • At least one mold selected from the first mold and the second mold includes a main body part and a movable part movable relative to the main body part.
  • each of the first and second molds may include a movable portion.
  • the first mold may include the movable part, or only the second mold may include the movable part.
  • the first and second molds include first and second movable parts that are movable in the pressing direction (vertical direction), respectively.
  • the 1st movable part contained in the 1st metallic mold may also contain the projection part for forming a slit.
  • at least one of the first and second molds includes first and second movable parts movable in a direction orthogonal to the pressing direction. The first and second movable parts are arranged so as to face each other with the cylindrical part interposed therebetween. By pressing the outer peripheral surface of the cylindrical portion with the two movable portions (first and second movable portions), the cylindrical portion can be compressed in the circumferential direction.
  • the press direction means the direction in which the main body of the mold moves during molding.
  • step (ii-1) of Example (B) the U-shaped part is deformed using a mold in which the pressing surface of the movable part does not protrude from the pressing surface of the main body part.
  • step (ii-2) the outer peripheral surface of the cylindrical portion is pressed by causing the pressing surface of the movable portion to protrude from the pressing surface of the main body, thereby shortening the cross-sectional peripheral length LT of the cylindrical portion.
  • the metal plate which comprises a tubular part is compressed to the circumferential direction.
  • a typical step (ii-2) only the movable part is moved without moving the main body part.
  • the mold (c) used in Example (C) has the following configuration.
  • the mold (c) includes a first mold having a protrusion and a second mold.
  • the first and second molds each include first and second pressing surfaces for deforming the U-shaped portion to form a cylindrical portion.
  • C-3) The cross-sectional peripheral length of the pressing surface of the mold (the pressing surfaces of the first and second molds) is shorter than the cross-sectional length LU of the U-shaped part.
  • Example (C) Unlike the mold (a) and the mold (b), the first mold and the second mold constituting the mold (c) are each in principle integrated. However, the protrusion of the first mold may be replaceable.
  • the U-shaped part is deformed only by bringing the first mold and the second mold close to each other in the step (ii), thereby forming a tubular part having a slit.
  • Example (C) has the advantage that the mold configuration is simple and the metal molded article can be easily manufactured.
  • the mold may include a pressing surface corresponding to the outer peripheral surface of the tubular portion, and the cross-sectional peripheral length of the pressing surface may be shorter than the cross-sectional length LU of the U-shaped portion.
  • the outer peripheral surface of the U-shaped portion is pressed by the pressing surface of the mold to form the tubular portion, so that the cross-sectional peripheral length LH of the tubular portion is larger than the cross-sectional length LU of the U-shaped portion.
  • the mold (c) has this configuration, and the mold (a) also has this configuration in principle.
  • die (b) may have this structure and does not need to have it.
  • die means the sum total of the cross-sectional length of the press surface of several members which comprise a metal mold
  • the sectional circumferential length of the pressing surface of the mold and the sectional circumferential part of the tubular part are usually It is considered that it is not significantly different from the length LH.
  • the cross-sectional circumference LH of the tubular portion can be replaced with the cross-sectional circumference of the pressing surface of the mold.
  • the cross-sectional peripheral length LH of the tubular portion can be replaced with the cross-sectional peripheral length of the pressing surface of the mold.
  • Step (ii) of the production method of the present invention is typically carried out without using a core, and for example, most of the inner peripheral surface (for example, the area of the inner peripheral surface) of the tubular portion (or tubular portion). May be carried out without using a core that contacts with 50% or more.
  • the tubular portion is easily compressed uniformly in the circumferential direction.
  • the core is used, the metal plate sandwiched between the mold and the core is hardly compressed in the circumferential direction.
  • a metal molded product having a complicated cross-sectional shape in the circumferential direction can be stably formed. For example, when the angle ⁇ shown in FIG.
  • a core may be used for stable molding.
  • a core may be arrange
  • the metal molded product may be further processed after step (ii). For example, a protrusion or a flat portion may be added to the metal molded product, or a hole may be made in the metal molded product.
  • the production method of the present invention is intended to produce a metal molded product including a tubular portion having a gap at the butt portion. Therefore, in principle, welding of the slit (a butting portion having a gap) is not performed after step (ii). However, a part of the butting portion may be welded. For example, when some of the butted portions have gaps (slits) and the other part does not have any gaps, some or all of the butted portions without gaps may be welded. Even in this case, it is preferable not to weld the butted portion having a gap. When assembling a product using a metal molded product, a part of the butt portion may be temporarily welded.
  • the metal molded product of the present invention includes a tubular portion having a slit.
  • the tubular portion is a tubular portion having a gap at the abutting portion.
  • the metal molded product of the present invention is manufactured by the manufacturing method of the present invention. There may be a case where a duplicate description of matters described in other places regarding the metal molded product is omitted. About the matter demonstrated about the metal molded product of this invention, it can apply to the manufacturing method of this invention, a manufacturing apparatus, and a metal mold
  • the metal molded product of the present invention may include a portion other than a tubular portion having a slit. Or the metal molded product may be comprised only by the tubular part which has a slit.
  • the metal molded product in that case is a tubular molded product having a slit.
  • the slit is usually formed along the axial direction (usually the longitudinal direction) of the tubular portion.
  • the slit may be formed in the whole tubular part, or may be formed only in a part of the tubular part.
  • the metal molded product may have a slit over the entire length of the butted portion, or may have a slit only in a part of the butted portion.
  • the shape of the tubular part having the slit is not particularly limited as long as it can be molded by the method of the present invention.
  • the shape of the cross section of the tubular portion is not particularly limited, and may be various shapes such as a circle, an ellipse, a quadrangle, a vertically asymmetrical shape, and a laterally asymmetrical shape.
  • the tubular portion may be a round tube or a square tube.
  • Examples of the shape of the tubular portion include a straight straight pipe, a bent curved pipe, a different diameter pipe having a different outer diameter in the longitudinal direction, a modified sectional pipe having a different sectional shape in the longitudinal direction, and the like.
  • examples of the tubular portion include the tube (tubular portion 1e) shown in FIGS. 9A, 9B, 9C, 9D, and 9E. In these tubes, a slit 3 is formed in the butt portion 2.
  • the tube shown in FIG. 9A is a straight tube having a circular cross-sectional shape in the circumferential direction.
  • the tube shown in FIG. 9B is a curved tube having a circular cross-sectional shape in the circumferential direction.
  • the tube shown in FIG. 9C is a trumpet-shaped different diameter tube having a circular cross-sectional shape in the circumferential direction.
  • the pipe shown in FIG. 9D is a modified cross-section pipe whose circumferential cross-sectional shape changes from a circular shape to a quadrangular shape.
  • the tube shown in FIG. 9E is a tube whose circumferential cross-sectional shape is asymmetrical in the vertical and lateral directions.
  • tube shown to FIG. 9E is a pipe
  • a tube having a circumferential cross-sectional shape that is asymmetrical and a tube using a tailored blank as illustrated in FIG. 9E are difficult to form by conventional UO forming.
  • the metal molded product of the present invention can be obtained by molding a metal plate (blank). Therefore, the material of the metal molded product is the same as that of the blank. Further, the plate thickness of the metal molded product is almost equal to the plate thickness of the blank. Therefore, the plate thickness of the metal molded product (plate thickness of the tubular portion) may be within the range exemplified as the plate thickness of the blank. Some of the physical properties of the metal molded product change from the physical properties of the blank in the processing step. In particular, since the tubular part is compressed in the circumferential direction, the physical properties of the metal molded product of the present invention are changed.
  • the metal molded product of the present invention can be manufactured.
  • the variation S of the Vickers hardness in the thickness direction in the cross section of the tubular portion is expressed by the following formula, the average value of the variation S in the circumferential direction is less than 0.4 (0 or more and 0). Less than 4).
  • S (Bmax ⁇ Bmin) / Bmax
  • Bmin is the minimum value of the Vickers hardness in the thickness direction in the cross section of the tubular portion.
  • Bmax is the maximum value of Vickers hardness in the thickness direction in the cross section.
  • the average value in the circumferential direction of the variation S is an average value of the variations S measured at three positions of one cross section (circumferential cross section) of the tubular portion.
  • the three positions to be measured are a first position in the vicinity of the slit of the tubular portion, a second position furthest in the circumferential direction from the first position, and a third position intermediate between the first position and the second position. It is.
  • the first, second, and third positions are about 180 °, 0 °, and 90 °, respectively.
  • the first position is set such that the distance from the end facing the slit is, for example, 5 mm or less.
  • the circumferential length LH of the tubular portion is made shorter than the sectional length LU of the U-shaped portion. Therefore, a compressive stress acts on the whole plate
  • all of the variations S measured at the above three positions are less than 0.4 (for example, less than 0.2). According to this configuration, improvement in durability and reliability can be particularly expected.
  • Vickers hardness is measured according to the test method of JIS Z 2244 Vickers hardness test of Japanese Industrial Standard (JIS). In the Vickers hardness test, an indenter is pushed into a test piece to form a recess, and the diagonal length of the recess is measured. When evaluating the variation S of the cut surface of the tubular portion, a plurality of depressions are formed on the cut surface and measured.
  • the tubular part is made of steel, copper or copper alloy, the distance between the centers of two adjacent indentations is 3d or more (d is the larger value of the diagonal length of the indentations), and the test piece from the center of the indentation The distance to the edge of (the cut surface of the tubular portion) is 2.5 d or more.
  • the tubular part is made of light metal (including aluminum, aluminum alloy, titanium, titanium alloy, magnesium and magnesium alloy)
  • the distance between the centers of two adjacent recesses is 6d or more, and The distance to the edge is 3d or more. These distances can be adjusted by the measurement interval of the Vickers hardness and the force for pushing the indenter.
  • the metal molded product of the present invention can be used for various purposes.
  • applications of metal molded products include parts (suspension parts, bodies, structural materials, etc.) of various vehicles (automobiles, railway vehicles, other vehicles), various machines, electronic devices, parts of electrical appliances, various types Parts of transport aircraft (ships, aircraft).
  • the production apparatus of the present invention is a production apparatus for producing a metal molded product including a tubular portion having a slit.
  • This manufacturing apparatus can be used in the manufacturing method of the present invention.
  • the metal molded product of the present invention can be manufactured by this manufacturing apparatus.
  • This manufacturing apparatus is a press apparatus from another viewpoint, and a configuration of a known press apparatus may be applied to a configuration not described below. In some cases, the description of the manufacturing apparatus described elsewhere is omitted.
  • the matters described for the production apparatus of the present invention can be applied to the production method, metal molded product, and mold of the present invention.
  • the manufacturing apparatus of the present invention includes a mold and a moving mechanism for moving the mold.
  • the mold includes a first mold and a second mold.
  • the first mold includes a protrusion for forming a slit.
  • Each of the first and second molds includes first and second pressing surfaces for deforming the U-shaped portion having a U-shaped cross section to form a cylindrical portion having a gap that becomes a slit.
  • the mold has a configuration for pressing the outer peripheral surface of the cylindrical portion so that the cross-sectional peripheral length LT of the cylindrical portion is shortened.
  • the manufacturing apparatus (a) uses the mold (a) described above.
  • the mold (a) has the following configurations (a-1), (a-2), and (a-3).
  • the mold (a) includes a first mold having a protrusion and a second mold.
  • the first and second molds each include first and second pressing surfaces for deforming the U-shaped portion to form a cylindrical portion.
  • A-3) At least one mold selected from the first mold and the second mold can be separated into a plurality of mold members.
  • the moving mechanism of the manufacturing apparatus (a) includes a first moving mechanism and a second moving mechanism.
  • the first moving mechanism is a moving mechanism that causes the first mold and the second mold to approach each other with a plurality of mold members separated.
  • the first moving mechanism approaches the first mold and the second mold until the first mold and the second mold come into contact with a plurality of mold members separated from each other.
  • the second moving mechanism is a moving mechanism that causes a plurality of separated mold members to approach each other.
  • the first moving mechanism corresponds to step (ii-1) of Example (A) described above.
  • the second moving mechanism corresponds to step (ii-2) in Example (A). According to manufacturing apparatus (a), process (ii) of example (A) mentioned above can be implemented.
  • the first mold of the mold (a) may be separable into a first mold member and a second mold member.
  • the protrusion for forming the slit may be constituted by a first protrusion included in the first mold member and a second protrusion included in the second mold member.
  • the manufacturing apparatus (b) uses the mold (b) described above.
  • the mold (b) has the following configurations (b-1), (b-2), and (b-3).
  • the mold (b) includes a first mold having a protrusion and a second mold.
  • Each of the first and second molds includes first and second pressing surfaces for deforming the U-shaped portion to form a cylindrical portion.
  • At least one mold selected from the first mold and the second mold includes a main body part and a movable part movable relative to the main body part.
  • the moving mechanism of the manufacturing apparatus (b) includes a first moving mechanism and a second moving mechanism.
  • the first moving mechanism is a moving mechanism that causes the first mold and the second mold to approach each other.
  • the first moving mechanism has the first mold and the first mold until the first mold and the second mold come into contact with each other in a state where the pressing surface of the movable part does not protrude from the pressing surface of the main body. Bring 2 molds close together.
  • the second moving mechanism is a moving mechanism that moves the movable portion so that the pressing surface of the movable portion protrudes from the pressing surface of the main body portion.
  • the first moving mechanism corresponds to step (ii-1) of Example (B) described above.
  • the second moving mechanism corresponds to step (ii-2) in Example (B). According to the manufacturing apparatus (b), the step (ii) of the above-described example (B) can be performed.
  • the moving mechanisms of the manufacturing apparatuses (a) and (b) may be configured by combining a telescopic mechanism and a cam, respectively.
  • the expansion / contraction mechanism include a gas cylinder, a hydraulic cylinder, a spring, and the like.
  • the manufacturing apparatus for carrying out the step (ii) of the example (C) described above is not particularly limited except that the mold (c) is used.
  • Step (ii) of Example (C) can be performed with a general press apparatus.
  • die of this invention is a metal mold
  • This mold can be used in the manufacturing apparatus of the present invention.
  • die can be utilized for the manufacturing method of this invention, and can be utilized specifically at process (ii) of the manufacturing method of this invention.
  • the metal molded product of the present invention can be manufactured. There may be a case where duplicate explanations are omitted with respect to matters described in other places regarding the mold.
  • the mold of the present invention includes a first mold including a protrusion for forming a slit and a second mold.
  • Each of the first and second molds includes first and second pressing surfaces for deforming the U-shaped portion having a U-shaped cross section to form a cylindrical portion having a gap that becomes a slit. .
  • the second pressing surface has a semi-cylindrical shape
  • the first pressing surface is a semicircle excluding the protrusions. It has a columnar shape.
  • the mold of the present invention has a configuration for pressing the outer peripheral surface of the cylindrical portion so that the cross-sectional peripheral length of the cylindrical portion is shortened.
  • die of this invention has the structure for compressing a cylindrical part in the circumferential direction. Examples of the mold of the present invention include the mold (a) and the mold (b) described above.
  • die which has a projection part may be used as an upper mold
  • the protrusion has a shape capable of forming a slit.
  • the slit can be formed along the axial direction of the tubular part.
  • the protrusion is a plate-like convex portion, and is provided at the uppermost position of the upper semicircular pressing surface.
  • the protrusion is provided at the center of the cross section (circumferential cross section) of the upper die pressing surface.
  • the protruding portion is not limited to the center portion, and may be located at a position shifted from the center.
  • the projection part when forming a left-right asymmetric tubular part, the projection part may be in a position shifted from the center part.
  • the position of the protrusion in the circumferential direction may change along the axial direction.
  • the width of the protrusion may change along the axial direction.
  • the slit width may be not less than t and not more than (Din-2t).
  • the width of the slit is less than t, the strength of the protrusion of the mold may be insufficient.
  • the slit width is larger than (Din ⁇ 2t), the effect of the invention may be reduced.
  • the width of the projection is selected according to the width of the slit (gap between the butted portions).
  • the width of the protrusion is preferably within ⁇ 10% of the width of the slit.
  • the mold (a) at least one mold selected from the first mold and the second mold can be separated into a plurality of mold members. If the number of mold members is large, the U-shaped part may be easily sandwiched between adjacent mold members during molding. Further, when the number of mold members is large, the structure of the mold and the apparatus using the mold becomes complicated. Therefore, in a preferable example in which the first mold is divided into a plurality of mold members, the first mold is divided into two mold members. Similarly, in a preferable example in which the second mold is divided into a plurality of mold members, the second mold is divided into two mold members.
  • the separation position is not particularly limited.
  • the protrusions are the first protrusion and the second mold included in the first mold member.
  • the mold (a) by moving a plurality of mold members separately, the cross-sectional circumferential length LH of the tubular portion can be easily finely adjusted, and the variation in compressive stress acting on the tubular portion can be reduced. Therefore, according to the mold (a), the spring back can be effectively suppressed, and as a result, the slit can be formed with high accuracy.
  • At least one mold selected from the first mold and the second mold includes the main body part and the movable part that is movable relative to the main body part. Including.
  • only the first mold may have the main body part and the movable part, or only the second mold may have the main body part and the movable part.
  • dies may have a main-body part and a movable part, respectively.
  • both molds each have a main body and a movable part, the area of the pressing surface of the movable part can be increased. Can be pressed.
  • the position where the movable part is disposed is not particularly limited as long as the movable part can be moved to adjust the cross-sectional circumference of the tubular part.
  • the movable part may be arranged at a position corresponding to the top part and the bottom part of the tubular part, or may be arranged at a position corresponding to two side parts of the tubular part.
  • the movable part is preferably arranged so as to correspond to two positions facing each other across the center of the tubular part.
  • the movable part is disposed at least in a region where step (ii) of Example (B) is performed.
  • the movable part may be disposed over the entire length of the mold, or may be disposed only in a part of the mold.
  • the number of movable parts may be one or plural. When there are a plurality of movable parts, it is easier to finely adjust the cross-sectional peripheral length of the tubular part than when there is only one movable part.
  • the second mold has a main body part and a movable part
  • the number of movable parts may be one or plural.
  • the movable part may be arranged at both a position corresponding to the top (or bottom) of the cylindrical part and a position corresponding to the side part of the cylindrical part.
  • the movable part can be moved by a cylinder, a cam mechanism or the like so as to move relative to the main body part.
  • the protrusion for forming the slit may be exchangeable.
  • the protrusions may be replaceable. Since the protrusion is easily consumed, the life of the mold can be extended by making the protrusion replaceable. Moreover, it becomes easy to adjust the width of the slit by exchanging the protrusions. When the physical properties (such as tensile strength) and thickness of the metal plate (blank) change, the amount of springback changes. Therefore, in the conventional method, it is necessary to change the entire mold every time the physical properties and thickness of the metal plate change. However, by making the protrusions replaceable, it becomes easy to adjust the width of the slit without changing the entire mold.
  • the shape of the mold is appropriately designed according to the shape of the target tubular portion.
  • the circumferential cross-sectional shape of the pressing surface of the mold may be a vertically asymmetric shape or a left-right asymmetric shape.
  • the cross-sectional shape in the circumferential direction of the pressing surface of the mold may be constant over the axial direction or may change in the axial direction.
  • the pressing surface of the mold may be straight in the axial direction or may be bent in the axial direction.
  • the first mold and the second mold may each be a single-acting type. Each of the first mold and the second mold may be double-acting as necessary.
  • at least one selected from the first and second molds is a double-acting type.
  • the cross-sectional peripheral length of the cylindrical portion can be finely adjusted, and the variation in compressive stress acting on the cylindrical portion can be reduced. Therefore, the spring back can be particularly effectively suppressed, and the accuracy of the shape of the continuous molding can be particularly increased.
  • the mold is a double-acting type, a mechanism that uses a double-acting press or a mechanism that uses a cylinder or a cam is used as a manufacturing apparatus that uses the mold.
  • die of this invention it is possible to change the compression rate of a tubular part, without changing a metal mold
  • the compressibility of the tubular portion can be changed depending on the distance between the plurality of mold members.
  • the compressibility of the tubular portion can be changed by changing the moving amount of the movable portion.
  • the mold of the present invention is suitable for mass production of the metal molded product of the present invention.
  • the mold of the present invention it is possible to reduce the variation in hardness distribution in the plate thickness direction and the variation in hardness distribution in the circumferential direction of the tubular portion. Therefore, a metal molded article having high fatigue strength can be produced by using the mold of the present invention.
  • the metal molded product of the present invention includes a tubular portion having a slit.
  • a cross section (circumferential cross section) in a direction orthogonal to the axial direction of the tubular portion is schematically shown in FIG.
  • the metal molded product 1 includes a tubular portion 1e in which a slit 3 is formed, and typically includes only the tubular portion 1e. In the slit 3, two end portions E1 and E2 are abutted.
  • the metal molded product 1 is a substantially closed cross-section part (a tubular part having a substantially closed cross section).
  • substantially closed cross section refers to a cross section in which a gap exists between two end portions of a metal plate formed into a tubular shape.
  • the substantially closed cross-section component may have a gap over the entire length of the butted portion, or may have a gap in a part of the butted portion.
  • the angle ⁇ formed by the line OP1 and the line OP2 is preferably 30 ° or more. If the angle ⁇ is too small, there is almost no difference from the cross section of the U-shaped part, and the strength (bending strength) of the tubular part after molding may be reduced.
  • a typical example of the angle ⁇ is 150 ° or more (for example, 170 ° or more).
  • the angle ⁇ is preferably 180 ° or less. If the angle ⁇ is too large, molding may become unstable.
  • Process (i) is schematically shown in FIGS. 2A and 2B.
  • a metal plate (blank) 1 a is disposed between the die 11 and the punch 12.
  • the die 11 and the punch 12 are U molds.
  • the metal plate 1a is press-molded to form a U-shaped portion 1b having a U-shaped cross section.
  • the U-shaped portion 1b has two ends E1 and E2.
  • step (i) the size relationship between the width W of the portion of the metal plate that becomes the tubular portion (tubular portion 1e) and the cross-sectional length LU of the U-shaped portion 1b varies depending on various conditions (the shape of the tubular portion, It depends on the conditions of step (i). Depending on these conditions, the cross-sectional length LU may be longer than the width W, the cross-sectional length LU may be shorter than the width W, or both may be equal. In the production method of the present invention, in the step (ii), it is important to form the tubular portion so that the cross-sectional circumferential length LH of the tubular portion is shorter than the cross-sectional length LU of the U-shaped portion. Therefore, there is no particular limitation on the relationship between the width W and the cross-sectional length LU in the step (i).
  • FIG. 3A schematically shows a mold used in step (ii) of the second embodiment.
  • the mold 20 of the second embodiment is an example of the mold (a) described above.
  • the mold 20 includes an upper mold (first mold) 21 and a lower mold (second mold) 22.
  • the upper mold 21 has a plate-like protrusion 23 for forming a slit.
  • the upper mold 21 includes a first upper mold (first mold member) 21a and a second upper mold (second mold member) 21b that are separable in the horizontal direction.
  • the projecting portion 23 includes a first projecting portion 23a included in the first upper mold 21a and a second projecting portion 23b included in the second upper mold 21b.
  • the lower mold 22 includes a first lower mold (first mold member) 22a and a second lower mold (second mold member) 22b that are separable in the horizontal direction.
  • the upper mold 21 has a first pressing surface 21p for pressing the outer peripheral surface of the U-shaped portion 1b to form the cylindrical portion 1d.
  • type 22 has the 1st press surface 22p for pressing the outer peripheral surface of the U-shaped part 1b and forming the cylindrical part 1d (FIG. 3D).
  • the protrusion 23 is a plate-like protrusion, and the length thereof is the same as or longer than the slit 3 to be formed.
  • the cross-sectional circumferential length of the entire pressing surface (the first pressing surface 21p and the second pressing surface 22p) of the mold 20 is shorter than the cross-sectional length LU of the U-shaped portion 1b.
  • Step (ii) of the second embodiment is the step of Example (A) described above, and includes step (ii-1) and step (ii-2). According to process (ii), the tubular part 1e which has a slit can be formed from the U-shaped part 1b.
  • step (ii) of the second embodiment first, as shown in FIG. 3B, the U-shaped portion 1 b is arranged in the mold 20.
  • the U-shaped portion 1b and the end E2 are U-shaped using the mold 20 with the protrusion 23 sandwiched therebetween.
  • the part 1b is deformed (step (ii-1)). Specifically, the upper mold 21 and the lower mold 22 are brought close to each other, and the outer peripheral surface of the U-shaped portion 1 b is pressed by the pressing surface of the mold 20.
  • step (ii-1) the first upper mold 21a and the second upper mold 21b are separated in the horizontal direction, and the first lower mold 22a and the second lower mold 22b are separated in the horizontal direction. It is done in the state. In this state, the upper mold 21 and / or the lower mold 22 are moved in the vertical direction to bring them closer together.
  • the cylindrical portion 1d is formed.
  • the U-shaped portion 1b is deformed into a U-shaped portion 1c.
  • the two end portions of the U-shaped portion 1c stop at the protruding portion 23, and a gap is generated between the two end portions.
  • the gap becomes the slit 3 of the tubular portion 1e.
  • the end E1 and the end E2 are opposed to each other with the projection 23 (projections 23a and 23b) interposed therebetween.
  • the cross-sectional length of the U-shaped portion 1b and the cross-sectional peripheral length LT of the cylindrical portion 1d may be substantially equal in the state of FIG. 3D.
  • This configuration can be realized by adjusting the distance between the first upper mold 21a and the second upper mold 21b and the distance between the first lower mold 22a and the second lower mold 22b.
  • the U-shaped portion 1b is greatly deformed to form the cylindrical portion 1d, it is possible to suppress the compression force from being applied in the circumferential direction. Therefore, it is possible to suppress the occurrence of buckling or the like when forming the cylindrical portion 1d.
  • substantially equal means that the difference in length between the two is, for example, less than 0.1% (for example, less than 0.05%) of the longer length.
  • the end portions E1 and E2 of the U-shaped portion 1b press the outer peripheral surface of the tubular portion 1d with the projection 23 sandwiched therebetween, thereby
  • the circumferential length LT is shortened (step (ii-2)).
  • the sectional circumference LT is shortened by closing the divided mold 20. More specifically, the first upper mold 21a and the second upper mold 21b are moved in the horizontal direction to bring them closer together, and the first lower mold 22a and the second lower mold 22b are moved in the horizontal direction. And bring them closer together.
  • the first upper mold 21a and the second upper mold 21b are moved in the horizontal direction to bring them closer together
  • the first lower mold 22a and the second lower mold 22b are moved in the horizontal direction. And bring them closer together.
  • the first upper mold 21a and the second upper mold 21b are in contact with each other, and are brought close to each other until the first lower mold 22a and the second lower mold 22b are in contact with each other. That is, in the example shown in FIG. 3E, the pressing surface of the mold 20 in the completely closed state corresponds to the outer peripheral surface of the tubular portion 1e.
  • step (ii-2) by reducing the cross-sectional peripheral length LT of the tubular portion 1d, the cross-sectional peripheral length LH of the tubular portion 1e can be made shorter than the cross-sectional length LU of the U-shaped portion 1b. In this way, the tubular portion 1e (metal molded product) shown in FIG. 3F is obtained.
  • a slit 3 is formed in the butting portion 2 of the tubular portion 1e.
  • FIG. 3E shows the case where the mold is completely closed in the final stage of molding.
  • the mold does not have to be completely closed at the final stage of molding.
  • the above-described compression rate C can be changed.
  • the desired tubular portion 1e may be manufactured without changing the mold.
  • the circumferential length LH of the tubular portion 1e is made shorter than the sectional length LU of the U-shaped portion 1b. That is, in the manufacturing method of the present invention, the tubular portion 1d is compressed in the circumferential direction to obtain the tubular portion 1e. As a result, in the tubular portion 1e, compressive stress acts on both the inner peripheral side and the outer peripheral side. Therefore, the spring back is suppressed and the slit 3 can be formed with high accuracy.
  • the tubular portion 1e is formed by compressing the tubular portion 1d in the circumferential direction. Therefore, in the tubular portion 1e, compressive stress acts on both the inner peripheral side and the outer peripheral side. Furthermore, in the tubular part 1e, the variation in the circumferential direction of the compressive stress can be reduced. As a result, variation in hardness distribution in the plate thickness direction and hardness distribution in the circumferential direction of the tubular portion 1e can be reduced. Therefore, according to the present invention, it is possible to obtain a tubular portion with high fatigue strength.
  • FIG. 4A schematically shows a mold used in step (ii) of the third embodiment.
  • the mold 30 of the third embodiment is an example of the mold (b) described above.
  • the mold 30 includes an upper mold (first mold) 31 and a lower mold (second mold) 32.
  • the upper mold 31 has a plate-like protrusion 33 for forming the slit 3.
  • the upper mold 31 includes a main body portion 31a and a movable portion 31b that can move relative to the main body portion 31a.
  • the movable portion 31 b is disposed on the top of the pressing surface 31 ap of the main body portion 31 a and includes a protrusion 33.
  • the lower mold 32 includes a main body portion 32a and a movable portion 32b that can move relative to the main body portion 32a.
  • the movable part 32b is disposed at the bottom of the pressing surface 32ap of the main body part 32a.
  • both the movable parts 31b and 32b are movable in the pressing direction (vertical direction).
  • the movable part 31b can be moved in the pressing direction as one body with the main body part 31a.
  • the movable part 32b can be moved in the pressing direction as one body with the main body part 32a.
  • the main body part and the movable part can be moved together in the pressing direction.
  • molding space) of a movable part comprises a part of press surface in principle, and a roll etc. are not arrange
  • the movable part can move in a state where the first and second main body parts are at the final molding position (dead point).
  • the main body portion 31a and the main body portion 32a include pressing surfaces 31ap and 32ap for pressing the outer peripheral surface of the U-shaped portion 1b to form the cylindrical portion 1d, respectively.
  • the movable portions 31b and 32b include pressing surfaces 31bp and 32bp that press the outer peripheral surface of the U-shaped portion 1b.
  • the pressing surface 31ap and the pressing surface 31bp constitute the pressing surface 31p of the upper mold 31.
  • the pressing surface 32ap and the pressing surface 32bp constitute the pressing surface 32p of the lower mold 32.
  • the cross-sectional circumferential length of the entire pressing surface is longer than the cross-sectional circumferential length LH of the tubular portion 1e.
  • the cross-sectional circumferential length of the entire pressing surface may be substantially equal to the cross-sectional length LU of the U-shaped portion 1b.
  • Step (ii) of the third embodiment is the step of Example (B) described above, and includes step (ii-1) and step (ii-2). According to process (ii), the tubular part 1e which has a slit can be formed from the U-shaped part 1b.
  • step (ii) of the third embodiment first, as shown in FIG. 4B, the U-shaped portion 1 b is arranged in the mold 20.
  • the U-shaped portion 1b and the end E2 are U-shaped using the mold 30 with the protrusion 33 interposed therebetween.
  • the part 1b is deformed (step (ii-1)). Specifically, the upper mold 31 and the lower mold 32 are brought close to each other, and the outer peripheral surface of the U-shaped portion 1 b is pressed by the pressing surface of the mold 30.
  • Step (ii-1) is performed in a state where the pressing surfaces 31bp and 32bp of the movable portions 31b and 32b do not protrude from the pressing surfaces 31p and 32p of the main body portion.
  • the cylindrical portion 1d is formed. That is, in the example shown in FIG. 4D, the pressing surfaces 31p and 32p correspond to the outer peripheral surface of the cylindrical portion 1d.
  • the U-shaped portion 1b is deformed to become a U-shaped portion 1c.
  • the two end portions of the U-shaped portion 1c stop at the protruding portion 33, and a gap is generated between the two end portions.
  • the gap becomes the slit 3 of the tubular portion 1e.
  • the end E1 and the end E2 are opposed to each other with the protrusion 33 interposed therebetween.
  • the sectional circumferential length of the entire pressing surface of the mold 30 may be substantially equal to the sectional length LU of the U-shaped portion 1b.
  • the U-shaped portion 1b is largely deformed to form the cylindrical portion 1d, it is possible to suppress the compression force from being applied in the circumferential direction. Therefore, it is possible to suppress the occurrence of buckling or the like when forming the cylindrical portion 1d.
  • the cylindrical portion 1d is pressed by pressing the outer peripheral surface of the cylindrical portion 1d with the end portions E1 and E2 of the U-shaped portion 1b sandwiching the protrusion 33. Is shortened (step (ii-2)). Specifically, the outer peripheral surface of the cylindrical portion 1d is pressed by causing the pressing surfaces of the movable portions 31b and 32b to protrude from the pressing surfaces of the main body portions 31a and 32a. In 3rd Embodiment, the slit 3 and the position facing it are pressed from the up-and-down direction among the cylindrical parts 1d.
  • step (ii-2) the cross-sectional circumferential length LT of the tubular portion 1d is shortened to make the cross-sectional circumferential length LH of the tubular portion 1e shorter than the cross-sectional length LU of the U-shaped portion 1b.
  • the tubular portion 1e (metal molded product) shown in FIG. 4F is obtained.
  • a slit 3 is formed in the butting portion 2 of the tubular portion 1e.
  • the tubular portion 1e is formed by compressing the tubular portion 1d in the circumferential direction. Therefore, as described in the second embodiment, the slit 3 can be formed with high accuracy. Moreover, in the manufacturing method of 3rd Embodiment, the compression rate mentioned above can be changed easily by changing the moving amount
  • the cylindrical portion 1d is compressed with a small contact area between the cylindrical portion 1d and the mold 30 because the cylindrical portion 1d is pressed and compressed by the movable portion.
  • the compressive force applied in the circumferential direction by the movable part is likely to be applied to the entire cylindrical part 1d. Therefore, according to the manufacturing method and mold of the third embodiment, the cylindrical portion 1d can be compressed more uniformly in the circumferential direction.
  • the manufacturing apparatus includes a first support base 141, a second support base 142, an expansion / contraction mechanism 141a, and an expansion / contraction mechanism 142a.
  • the first support base 141 is provided with an expansion / contraction mechanism 141a and a movable portion 31b.
  • the expansion / contraction mechanism 141a can expand and contract in the press direction, and presses the main body 31a.
  • the second support base 142 is provided with an expansion / contraction mechanism 142a and a movable portion 32b.
  • the expansion / contraction mechanism 142a can expand and contract in the press direction and supports the main body 32a.
  • the extension mechanisms 141a and 142a are not limited, and may be gas cylinders, hydraulic cylinders, springs, or the like.
  • step (ii) of the third embodiment first, as shown in FIG. 14A, the U-shaped portion 1b is arranged in the mold 30. Next, as shown in FIGS. 14B and 14C, the first support base 141 and the second support base 142 are brought close to each other. Thereby, the above-described step (ii-1) is performed to obtain the cylindrical portion 1d. Next, as shown in FIG. 14D, the first support base 141 and the second support base 142 are further brought closer together while contracting the expansion / contraction mechanism. As a result, as shown in FIG. 14D, the pressing surfaces of the movable portions 31b and 32b protrude from the pressing surfaces of the main body portions 31a and 32a to press the outer peripheral surface of the cylindrical portion 1d. In this way, step (ii-2) is performed.
  • a mechanism (not shown) for bringing the first support base 141 and the second support base 142 closer to each other, and the expansion / contraction mechanism 141a and the expansion / contraction mechanism 142a in a non-expandable state are the above-described manufacturing apparatus.
  • the mechanism for bringing the first support base 141 and the second support base 142 close to each other, and the expansion / contraction mechanism 141a and the expansion / contraction mechanism 142a in a state of expansion / contraction correspond to a second movement mechanism.
  • the same constituent member may serve as both the first moving mechanism and the second moving mechanism. You may implement
  • FIG. 5A schematically shows a mold used in step (ii) of the fourth embodiment.
  • the mold 30 of the fourth embodiment is an example of the mold (b) described above.
  • the mold 30 includes an upper mold (first mold) 31 and a lower mold (second mold) 32.
  • the upper mold 31 has a plate-like protrusion 33 for forming the slit 3.
  • the upper mold 31 includes a main body part 31a and two movable parts 31b that can move relative to the main body part 31a.
  • the movable part 31b is disposed at the lowermost part of the pressing surface of the main body part 31a.
  • the lower mold 32 includes a main body portion 32a and two movable portions 32b that are movable relative to the main body portion 32a.
  • the movable part 32b is disposed on the uppermost part of the pressing surface of the main body part 32a.
  • both the movable parts 32a and 32b are movable in the horizontal direction.
  • the movable portion 31b can be moved in the vertical direction (press direction) integrally with the main body portion 31a.
  • the movable portion 32b can be moved in the vertical direction integrally with the main body portion 32a.
  • the main body portion 31a and the main body portion 32a include pressing surfaces 31ap and 32ap for pressing the outer peripheral surface of the U-shaped portion 1b to form the cylindrical portion 1d, respectively.
  • the movable portions 31b and 32b include pressing surfaces 31bp and 32bp that press the outer peripheral surface of the U-shaped portion 1b.
  • the cross-sectional circumferential length of the entire pressing surface is longer than the cross-sectional circumferential length LH of the tubular portion 1e.
  • the cross-sectional circumferential length of the entire pressing surface may be substantially equal to the cross-sectional length LU of the U-shaped portion 1b.
  • Step (ii) of the fourth embodiment is the step of Example (B) described above, and includes step (ii-1) and step (ii-2). According to process (ii), the tubular part 1e which has a slit can be formed from the U-shaped part 1b.
  • step (ii) of the fourth embodiment first, as shown in FIG. 5B, a U-shaped portion 1b is placed in the mold 30.
  • the U-shaped portion 1b and the end E2 are U-shaped using the mold 30 with the protrusion 33 interposed therebetween.
  • the part 1b is deformed (step (ii-1)). Specifically, the upper mold 31 and the lower mold 32 are brought close to each other, and the outer peripheral surface of the U-shaped portion 1 b is pressed by the pressing surface of the mold 30.
  • Step (ii-1) is performed in a state in which the pressing surfaces 31bp and 32bp of the movable portion do not protrude from the pressing surfaces 31ap and 32ap of the main body portion.
  • the cylindrical portion 1d is formed.
  • the U-shaped portion 1b is deformed to become a U-shaped portion 1c.
  • the two end portions of the U-shaped portion 1c stop at the protruding portion 33, and a gap is generated between the two end portions.
  • the gap becomes the slit 3 of the tubular portion 1e.
  • the end E1 and the end E2 are opposed to each other with the protrusion 33 interposed therebetween.
  • the cross-sectional circumferential length of the entire pressing surface of the mold 30 may be substantially equal to the cross-sectional length LU of the U-shaped portion 1b.
  • the U-shaped portion 1b is largely deformed to form the cylindrical portion 1d, it is possible to suppress the compression force from being applied in the circumferential direction. Therefore, it is possible to suppress the occurrence of buckling or the like when forming the cylindrical portion 1d.
  • the cylindrical portion 1d is pressed by pressing the outer peripheral surface of the cylindrical portion 1d with the end portions E1 and E2 of the U-shaped portion 1b sandwiching the protrusion 33. Is shortened (step (ii-2)). Specifically, the outer peripheral surface of the cylindrical portion 1d is pressed by causing the pressing surfaces 31bp and 32bp of the movable portions 31b and 32b to protrude from the pressing surfaces 31ap and 32ap of the main body portions 31a and 32b. In 4th Embodiment, the side surface of the cylindrical part 1d is pressed from right and left.
  • step (ii-2) the cross-sectional peripheral length LT of the tubular portion 1e is made shorter than the cross-sectional length LU of the U-shaped portion 1b by shortening the cross-sectional peripheral length LT of the tubular portion 1d.
  • the tubular portion 1e (metal molded product) shown in FIG. 5F is obtained.
  • a slit 3 is formed in the butting portion 2 of the tubular portion 1e.
  • the tubular portion 1e is formed by compressing the tubular portion 1d in the circumferential direction. Therefore, as described in the second and third embodiments, the slit 3 can be formed with high accuracy. Moreover, in the manufacturing method of 3rd and 4th embodiment, the compression rate mentioned above can be changed easily by changing the movement amount of a movable part. Therefore, even when the thickness and physical properties of the metal plate 1a are slightly changed, there may be a case where the desired tubular portion 1e can be manufactured without changing the mold.
  • the manufacturing apparatus includes a first support base 151, two telescopic mechanisms 141 a, two shafts 153, and two cam units 154.
  • the telescopic mechanism 141a and the shaft 153 are disposed on the first support base 151.
  • the expansion / contraction mechanism 141a can expand and contract in the press direction, and presses the main body 31a.
  • step (ii) of the fourth embodiment first, as shown in FIG. 15A, the U-shaped portion 1b is arranged in the mold 30. Next, as shown in FIGS. 15B and 15C, the first support base 151 is pushed down. Thereby, the above-described step (ii-1) is performed to obtain the cylindrical portion 1d. Next, as shown in FIG. 15D, the first support base 151 is further pushed down while contracting the telescopic mechanism. At this time, the two cam units 154 are moved by the two shafts 153, and the movable portions 31b and 32b are moved by the cam unit 154. As a result, as shown in FIG. 15D, the pressing surfaces of the movable portions 31b and 32b protrude from the pressing surfaces of the main body portions 31a and 32a to press the outer peripheral surface of the cylindrical portion 1d. In this way, step (ii-2) is performed.
  • a mechanism (not shown) for moving the first support base 151 downward and an expansion / contraction mechanism 141a that does not expand / contract are the first movement mechanism of the manufacturing apparatus (b) described above. It corresponds to. Further, the mechanism for moving the first support base 151 downward, the shaft 153, and the cam unit 154 constitute a second movement mechanism. You may implement
  • step (Fifth embodiment) 5th Embodiment demonstrates the other example of the manufacturing method of this invention, and the metal mold
  • the manufacturing method of 5th Embodiment contains process (i) and process (ii). Since step (i) is the same as step (i) described in the second embodiment, a duplicate description is omitted.
  • FIG. 6A schematically shows a mold used in step (ii) of the fifth embodiment.
  • the mold 20 of the fifth embodiment includes an upper mold (first mold) 21 and a lower mold (second mold) 22.
  • the upper mold 21 has a plate-like protrusion 23 for forming the slit 3.
  • Each of the first upper mold 21 and the second lower mold 22 includes pressing surfaces 21p and 22p for pressing the outer peripheral surface of the U-shaped portion 1b to form the tubular portion 1d.
  • the sectional circumferential length of the entire pressing surface is shorter than the sectional length LU of the U-shaped portion 1b.
  • Step (ii) of the fifth embodiment is the step of Example (C) described above.
  • step (ii) of the fifth embodiment first, as shown in FIG. 6B, the U-shaped portion 1 b is disposed in the mold 20.
  • step (ii) of the fifth embodiment first, as shown in FIG. 6B, the U-shaped portion 1 b is disposed in the mold 20.
  • the U-shaped portion 1b is deformed by using the mold 20 so that the end portion E1 and the end portion E2 of the U-shaped portion 1b sandwich the protruding portion 23.
  • the cylindrical portion 1d is formed.
  • the upper mold 21 and the lower mold 22 are brought close to each other, and the outer peripheral surface of the U-shaped portion 1 b is pressed with the pressing surface of the mold 20.
  • the U-shaped portion 1b is deformed to become a U-shaped portion 1c.
  • the two end portions of the U-shaped portion 1c stop at the protruding portion 23, and a gap is generated between the two end portions.
  • the gap becomes the slit 3 of the tubular portion 1e.
  • FIG. 6D shows an example of a state in which the cross-sectional circumferential length LT of the cylindrical portion 1d is substantially the same as the cross-sectional length LU of the U-shaped portion 1b. Since the cross-sectional circumferential length of the pressing surface of the mold 20 is shorter than the cross-sectional length LU of the U-shaped portion 1b, the upper mold 21 and the lower mold 22 are not in contact with each other at the stage of FIG. 6D. That is, at the stage of FIG. 6D, the mold 20 has not been closed yet.
  • the upper mold 21 and the lower mold 22 are brought closer to each other from the stage of FIG. 6D, and the mold 20 is closed as shown in FIG. 6E.
  • the upper mold 21 is moved to the bottom dead center, and the upper mold 21 and the lower mold 22 are brought into contact with each other.
  • the outer peripheral surface of the cylindrical portion 1d is pressed by the pressing surface of the mold 20 with the two end portions E1 and E2 sandwiching the protrusion 23.
  • a tubular portion 1e having a slit 3 in the butting portion 2 shown in FIG. 6F is formed.
  • the cross-sectional circumferential length of the pressing surface of the mold 20 is shorter than the cross-sectional length LU of the U-shaped portion 1b.
  • the cross-sectional circumferential length LH of the tubular portion 1e is shorter than the cross-sectional length LU of the U-shaped portion 1b. That is, in the step of FIG. 6E, the cylindrical portion 1d is compressed in the circumferential direction to become a tubular portion 1e.
  • the molding is finished before the mold 20 is completely closed. It is also possible to do. In that case, it is possible to adjust the compression ratio of the tubular portion 1e by adjusting how close the upper die 21 and the second lower die 22 are.
  • the tubular portion 1e is formed by compressing the tubular portion 1d in the circumferential direction. Therefore, as described in the second embodiment, the slit 3 can be formed with high accuracy.
  • the protrusion of the mold of the present invention may be replaceable.
  • An example of a mold in which the protrusions can be exchanged is shown in FIG.
  • the mold 20 in FIG. 7 includes an upper mold (first mold) 21 and a lower mold (second mold) 22.
  • the upper mold 21 has a portion 24 including a protrusion 23.
  • the portion 24 is inserted into the hole 25 of the upper mold 21 and can be exchanged.
  • the protruding portion 23 is a portion where two end portions (end portions E1 and E2) of the U-shaped portion are in contact with each other, and wear and deformation are likely to occur. Therefore, it is preferable that the protrusion 23 be replaceable. Furthermore, the effect mentioned above is acquired by making the projection part 23 replaceable.
  • the present invention provides a method for manufacturing a substantially closed cross-sectional component having a gap at the butted portion.
  • the manufacturing method of this viewpoint is called manufacturing method (S).
  • the manufacturing method (S) includes a first step and a second step.
  • the metal plate is formed into a U-shape to obtain a U-shaped product.
  • This U molded product corresponds to the molded product including the U-shaped part formed in the above-described step (i).
  • the U molded product is molded into a substantially closed cross section using a mold, and the cross sectional circumference of the substantially closed cross sectional component is made shorter than the cross sectional circumference of the U molded product.
  • the mold used has a protrusion corresponding to the abutting portion of the substantially closed cross-section component, and has a mechanism capable of adjusting the cross-sectional peripheral length of the substantially closed cross-section component.
  • the mold include the above-described molds (a), (b), and (c).
  • the first step and the second step correspond to the above-described steps (i) and (ii), respectively.
  • the substantially closed cross-section component having a gap corresponds to the above-described metal molded product including the tubular portion having the slit.
  • a “substantially closed cross-section component” refers to a component having a substantially closed cross section.
  • the “substantially closed cross section” refers to a cross section in which a gap exists between two end portions of a metal plate formed into a tubular shape.
  • the substantially closed cross-section component may have a gap over the entire length of the butted portion, or may have a gap in a part of the butted portion.
  • the sectional circumference of the mold may be shorter than the sectional circumference of the U-shaped product.
  • the cross-sectional circumference of the mold refers to the cross-sectional circumference of the mold when the mold is completely closed.
  • the mold may include an upper mold and a lower mold having the protrusions, and at least one of the upper mold and the lower mold may include a main body portion and a movable portion. Good.
  • the mold having this configuration corresponds to the above-described mold (b).
  • the present invention provides a mold for producing a substantially closed cross-section part having a U-shaped product formed into a substantially closed cross section and having a gap at a butt portion.
  • die is called metal mold
  • the mold (T1) includes an upper mold having a protrusion corresponding to the abutting portion of the substantially closed cross-section component, and a lower mold.
  • the mold (T1) has a mechanism capable of adjusting the cross-sectional peripheral length of the substantially closed cross-sectional component. At least one of the upper mold and the lower mold is divided into a plurality.
  • the mold (T1) corresponds to the above-described mold (a). In the mold (T1), the protrusion of the upper mold may be divided.
  • An example of a mold having this configuration is the mold 20 shown in FIG. 3A.
  • the present invention provides another mold for forming a U-shaped article into a substantially closed cross section and manufacturing a substantially closed cross-section component having a gap at the butt portion.
  • this mold is referred to as a mold (T2).
  • the mold (T2) includes an upper mold having a protrusion corresponding to the butted portion of the substantially closed cross-section component, and a lower mold.
  • the mold (T2) has a mechanism capable of adjusting the cross-sectional circumference of the substantially closed cross-section component.
  • At least one of the upper mold and the lower mold includes a main body portion and a movable portion.
  • the mold (T2) corresponds to the above-described mold (b).
  • the protrusions may be replaceable.
  • Example 1 a U-shaped product (U-shaped portion) is formed by the manufacturing method shown in FIGS. 2A to 2B, and further, a tubular member (a metal molded product) having a slit is formed by the manufacturing method shown in FIGS. 3B to 3E.
  • a metal plate blade
  • TS tensile strength
  • the outer diameter of the tubular member was 50 mm, and the length was 200 mm.
  • the width of the upper mold protrusion was 5 mm.
  • Example 2 In Example 2, a tubular member having a slit was produced using the same metal plate as in Example 1 by the production method shown in FIGS. 2A to 2B and FIGS. 4B to 4E. The dimensions of the tubular member and the width of the upper mold protrusion were the same as in Example 1.
  • Example 3 In Example 3, a U-shaped product (U-shaped part) is formed by the manufacturing method shown in FIGS. 2A to 2B using the same metal plate as in Example 1, and the manufacturing method shown in FIGS. 5B to 5E. Thus, a tubular member having a slit was produced. The dimensions of the tubular member and the width of the upper mold protrusion were the same as in Example 1.
  • Example 4 In Example 4, a U-shaped product (U-shaped part) is formed by the manufacturing method shown in FIGS. 2A to 2B using the same metal plate as in Example 1, and then the manufacturing method shown in FIGS. 6B to 6E. Thus, a tubular member having a slit was produced. The dimensions of the tubular member and the width of the upper mold protrusion were the same as in Example 1.
  • Comparative Example 1 In Comparative Example 1, U forming was performed by the method shown in FIGS. 2A to 2B using the same metal plate as in Example 1. Thereafter, as shown in FIGS. 10A to 10B, a tubular member 50a was manufactured by performing O-molding using a mold (upper mold 51 and lower mold 52) having no protrusions. The cross-sectional peripheral length of the pressing surface of the mold when the mold was completely closed was the same as the cross-sectional length of the U-shaped product (U-shaped part).
  • the compression rate C of Examples 1 to 4 was set to 0.99%.
  • the compression rate C of Comparative Examples 1 and 2 was about 0%.
  • FIG. 12B The vertical axis
  • shaft of FIG. 12B shows the absolute value of distortion.
  • the bottom of the cross section of the tubular member was 0 °, and the butted portion was 180 °.
  • the tubular members of Examples 2 to 4 had a larger absolute strain value than the tubular member of Comparative Example 2. This result suggests that in the tubular members of Examples 2 to 4, large compressive stress is generated over the entire circumferential direction.
  • the distribution of Vickers hardness was determined using the results of simulation by FEM (finite element method). From the distribution, the Vickers hardness variation S in the thickness direction of the first position described above was obtained. Similarly, the Vickers hardness variation S in the thickness direction was also obtained for the second and third positions. As a result, in the tubular member of Example 1, the variation S was about 0.1 at any of the first, second, and third positions. That is, in the tubular member of Example 1, the average value in the circumferential direction of the variation S was about 0.1. This result suggests that in the tubular member of Example 1, the variation in Vickers hardness is small in both the plate thickness direction and the circumferential direction.
  • the variation S was about 0.7 at any of the first, second, and third positions. That is, in the tubular members of Comparative Examples 1 and 2, the average value of the variation S in the circumferential direction was about 0.7.
  • FIG. 13 shows a graph showing the relationship between the average value in the circumferential direction of the variation S and the reduction rate of the uniaxial compressive strength.
  • the graph in FIG. 13 is a graph obtained by simulating a result when a uniaxial compression test is performed on the round tubes assuming a plurality of round tubes in which the average value in the circumferential direction of the variation S is a predetermined value. It is.
  • the vertical axis of the graph of FIG. 13 is the rate of decrease in uniaxial compressive strength when a round tube whose average value in the circumferential direction of variation S is 0 is used as a reference. Specifically, a simulation of a uniaxial compression test was performed on the round tube, and the reduction rate (%) of the uniaxial compression strength of another round tube was obtained with reference to the uniaxial compression strength at that time. Is shown on the vertical axis.
  • FIG. 13 shows two dotted lines representing the trend of change in the rate of decrease in uniaxial compressive strength.
  • the reduction rate of the uniaxial compressive strength was greatly increased.
  • the average value in the circumferential direction of the variation S was less than 0.4, the reduction rate of the uniaxial compressive strength was small. The result of FIG. 13 suggests that it is important that the average value in the circumferential direction of the variation S is less than 0.4.
  • the conventional method for manufacturing a tubular member having a slit it may be necessary to bend the metal plate little by little to make it tubular, or to apply a throttle to the metal plate and make it tubular.
  • the number of steps can be reduced, and as a result, the cost can be reduced.
  • the present invention can be used for a metal molded product including a tubular portion having a slit and a method for manufacturing the metal molded product. Furthermore, this invention can be utilized for the manufacturing apparatus for manufacturing the said molded article, and the metal mold

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)

Abstract

L'invention concerne un procédé de fabrication qui est un procédé de fabrication pour la fabrication d'un produit formé de métal comprenant une partie tubulaire (1e) présentant une fente (3). Le procédé de fabrication selon l'invention comprend: une étape (i) de formation d'une partie en forme de U qui présente une section transversale en forme de U, par la déformation d'une tôle; et une étape (ii) de formation de la partie tubulaire (1e) présentant la fente, par la déformation de la partie en forme de U au moyen d'une matrice (20) présentant une saillie (23), de sorte que la saillie soit maintenue entre les deux extrémités de la partie en forme de U. Dans l'étape (ii), une longueur circonférentielle de coupe transversale LH de la partie tubulaire (1e) est rendue plus courte qu'une longueur de coupe transversale LU de la partie en forme de U.
PCT/JP2016/001012 2015-02-25 2016-02-25 Produit formé de métal comprenant une partie tubulaire présentant une fente et procédé de fabrication associé, et dispositif de fabrication et matrice utilisés pour celui-ci WO2016136259A1 (fr)

Priority Applications (9)

Application Number Priority Date Filing Date Title
EP16755009.4A EP3263240B1 (fr) 2015-02-25 2016-02-25 Article metallique formé comprenant une partie tubulaire présentant une fente, son procédé de production et dispositif de production et ensemble- matrice utilises dans le procédé de production
JP2017501946A JP6531818B2 (ja) 2015-02-25 2016-02-25 スリットを有する管状部を含む金属成形品およびその製造方法、ならびにそれに用いられる製造装置および金型
US15/550,813 US20180021829A1 (en) 2015-02-25 2016-02-25 Formed metal item including tubular part with slit, method for producing the same, and producing device and die assembly used in method for producing the same
RU2017133119A RU2683673C2 (ru) 2015-02-25 2016-02-25 Формованное металлическое изделие, включающее в себя трубчатую часть с щелью, способ изготовления такого изделия и устройство и матричный узел, используемые в способе изготовления такого изделия
KR1020177026533A KR101983929B1 (ko) 2015-02-25 2016-02-25 슬릿을 가지는 관상부를 포함하는 금속 성형품 및 그 제조 방법, 및 그에 이용되는 제조 장치 및 금형
BR112017016143-5A BR112017016143A2 (pt) 2015-02-25 2016-02-25 artigo de metal formado incluindo parte tubular com fenda, método para produzir o mesmo, e dispositivo de fabricação e montagem de matriz usado no método para produzir o mesmo
CA2975861A CA2975861C (fr) 2015-02-25 2016-02-25 Produit forme de metal comprenant une partie tubulaire presentant une fente et procede de fabrication associe, et dispositif de fabrication et matrice utilises pour celui-ci
MX2017010764A MX2017010764A (es) 2015-02-25 2016-02-25 Articulo de metal formado que incluye una parte tubular con ranura, metodo de produccion del mismo, y dispositivo de produccion y ensamble de matriz usado en metodo de produccion del mismo.
CN201680011678.7A CN107427879A (zh) 2015-02-25 2016-02-25 包括具有狭缝的管状部的金属成形品及其制造方法、以及其所使用的制造装置和模具

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JP2015035754 2015-02-25
JP2015-035754 2015-02-25
JP2016-027388 2016-02-16
JP2016027388 2016-02-16

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US (1) US20180021829A1 (fr)
EP (1) EP3263240B1 (fr)
JP (1) JP6531818B2 (fr)
KR (1) KR101983929B1 (fr)
CN (1) CN107427879A (fr)
BR (1) BR112017016143A2 (fr)
CA (1) CA2975861C (fr)
MX (1) MX2017010764A (fr)
RU (1) RU2683673C2 (fr)
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JP2018161678A (ja) * 2017-03-27 2018-10-18 ダイハツ工業株式会社 管状部品のプレス成形方法及びこれに用いられるプレス成形金型
JP2018161684A (ja) * 2017-03-27 2018-10-18 株式会社ワイテック 金属管の製造方法

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DE102017106999A1 (de) * 2017-03-31 2018-10-04 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung eines durch U-O-Formen hergestellten Blechumformbauteils sowie Blechumformbauteil
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