JP2005246437A - Forming die for metallic component of headrest, method for manufacturing metallic component of headrest, and pressing device therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a forming die for a metallic component of a headrest, a method for manufacturing the metallic component of the headrest, which facilitates press working and enhances strength of the component, and a pressing device therefor. <P>SOLUTION: In the forming die 10 for forming the metallic component of the headrest by press working, a flat portion and a curved face are provided in the longitudinal direction of a metallic solid bar. Notches 18a-18e are formed on the curved face. The forming die 10 is placed and fixed on a first holding section 30 and second holding sections 32a and 32b, and punches 34a-34e are lowered under pressure so that recesses are formed in the cylindrical metallic component 20 by the notches 18a-18e. Then the cylindrical metallic component 20 is turned so that the cylindrical metallic component 20 is separated from the first holding section 30 and the second holding sections 32a and 32b. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a headrest fitting forming mold, a method for manufacturing a headrest fitting, and a manufacturing press working apparatus, and more specifically, forming a recess for adjusting the height of a headrest portion of a seat back stepwise by press working. The present invention relates to a headrest fitting forming mold, a headrest fitting manufacturing method, and a manufacturing press working apparatus.

  A headrest for protecting the head of an occupant seated on the seat is installed in the seat of a passenger car or the like, and the headrest is usually made of an impact absorbing material such as a urethane material as shown in FIG. It consists of a headrest main body 100 covered with a skin and a headrest metal fitting 102 obtained by deforming a metal cylindrical metal fitting into a substantially U shape.

  The headrest fitting 102 is fixed to the main body 100 with two stay leg portions 104 and 106 protruding from the main body 100. That is, the main body 100 is fixed to the seat back 108 by inserting the stay leg portions 104 and 106 into the support holes 110 and 112 formed in the seat back 108, respectively.

  A plurality of concave portions 114 are formed in the stay leg portion 104 at regular intervals, and a claw portion 116 that can be engaged with and disengaged from the concave portion 114 is formed around the upper end portion of the support hole 110 of the seat back 108. By engaging the claw 116 with the recess 114, the height of the main body 100 can be adjusted step by step according to the position of the head of the occupant.

  As a manufacturing method of the headrest fitting 102 configured as described above, conventionally, a metal solid bar is used, and the recess 114 is formed by cutting the bar. In order to reduce the weight of the vehicle body, a method has been proposed in which the concave portion 114 is formed by pressing a cylindrical metal fitting.

  As a headrest fitting manufacturing mold for forming the recess 114 by pressing the cylindrical fitting, there are conventional techniques such as Patent Document 1 and Patent Document 2, for example.

JP 2002-002430 A JP 2002-346643 A

  In the invention disclosed in Patent Document 1 and Patent Document 2, a molding die made of a metal solid rod-like body and having a plurality of recess-forming notches is inserted into a cylindrical metal fitting and pressed in accordance with the notches. 2. Description of the Related Art A mold for producing a headrest fitting that can form a recess by processing is used. The molding die has a configuration such that a notch portion has a step so that the molding die does not come into contact with a concave portion formed by rotating the molding die when the molding die is pulled out from the cylindrical metal fitting. .

  By the way, the mold is usually manufactured by a method of cutting a metal solid rod-like body to form a notch, so that the cutting process becomes complicated and the strength of the mold decreases. There is an inconvenience.

  It is also recalled that the cylindrical fitting is formed by seam welding. When the cylindrical metal fitting formed by seam welding is pressed to form a recess, it is necessary to press toward the seam welding portion. This is to ensure the strength so that there are no welds in the remaining part.

  As another problem, as described above, when forming a recess in the cylindrical metal fitting by pressing according to the notch of the mold, excess pressure is applied not only to the molded part but also to the vicinity of the molded part. As a result, there is an inconvenience that the edge of the recess is not formed into a precise acute angle and does not function sufficiently as a headrest fitting.

  Furthermore, the headrest bracket is generally U-shaped, and when a recess is formed on one leg of the headrest bracket, it is obstructed by the other leg and pressed from above in the vertical direction. It becomes difficult. In addition, the invention disclosed in Patent Document 1 has a disadvantage in that it is difficult to perform precise processing using the pressing force sufficiently in order to perform pressure processing from the lateral direction.

  The present invention has been made in consideration of the above-described problems, and in a molding die for manufacturing a headrest fitting by pressing a cylindrical fitting, the cutting work on the molding die is reduced as much as possible. It is an object of the present invention to provide a metal mold for headrest that has higher strength than conventional molds.

  In addition, when manufacturing a headrest metal fitting by pressing a metal fitting that is seam-welded and formed into a cylindrical shape, manufacturing a headrest metal fitting to avoid cracking of the cylindrical metal fitting at the seam portion as much as possible It aims to provide a method.

  Furthermore, in an apparatus for manufacturing a headrest fitting by pressing a cylindrical fitting, the cylindrical fitting is pressed from the upper part in the vertical direction, and the edge of the recess formed in the cylindrical fitting is an acute angle. An object of the present invention is to provide a press working device for manufacturing a headrest fitting for forming a headrest.

  In order to achieve the above-mentioned object, a headrest metal fitting forming die according to the present invention is a headrest metal fitting that is manufactured by pressing a cylindrical metal fitting and forming a recess for adjusting the height of the headrest. A metal mold, wherein the mold comprises a rod-like body, and has a flat portion formed along the longitudinal direction of the rod-like body, and a curved surface connected to the flat portion, the curved surface being a press It has a notch part for forming a concave part in a cylindrical metal fitting by processing, and the notch part has a smaller diameter than the curved surface and is formed in an arc shape.

  The method for manufacturing a headrest metal fitting according to the present invention includes a step of pressing the cylindrical metal fitting into a cylindrical metal fitting formed by seam welding, thereby pressing the cylindrical metal fitting. A method of manufacturing a headrest fitting having a recess for adjusting the height, wherein the molding die includes a flat portion formed along a longitudinal direction of the rod-shaped body, and a curved surface connected to the flat portion. The curved surface has a notch for forming a recess in the cylindrical fitting by press working, and the step of inserting the molding die into the cylindrical fitting held by a holding member; A step of forming a recess in the cylindrical fitting by pressing the inserted cylindrical fitting, and rotating the molding die or the cylindrical fitting to bring the flat portion of the molding die forward A step of parallel to the bottom surface of the recess, characterized in that comprising the step of withdrawing the mold from the cylindrical metal fitting. Preferably, a concave portion is formed in the cylindrical metal fitting by pressing the cylindrical metal fitting into which the forming die is inserted at a portion opposite to a seam welded portion of the cylindrical metal fitting.

  The headrest bracket manufacturing apparatus according to the present invention inserts a molding die made of a rod-like body into a cylindrical bracket formed by seam welding, thereby pressing the cylindrical bracket to increase the height of the headrest. A press working apparatus for manufacturing a headrest metal fitting having a recess for adjusting the height, wherein the molding die includes a flat portion formed along a longitudinal direction of the rod-shaped body, and a curved surface connected to the flat portion. The curved surface has a notch for forming a recess in the cylindrical fitting by pressing, a holding member that holds the mold, a holding member that holds the cylindrical fitting, and A pressing protrusion for forming a concave portion by pressing the cylindrical metal fitting into which the forming die is inserted, and the cylindrical metal fitting is pressed from above in the vertical direction. The width of surfaces is characterized by comprising greater than a width of the notch portion of the mold.

  According to the headrest fitting forming mold according to the present invention, when the headrest fitting is manufactured by pressing the cylindrical fitting, the cutting process to the forming die is reduced as much as possible, and the structure is simple. The strength can be improved over the conventional mold.

  Further, according to the method for manufacturing the headrest metal fitting according to the present invention, when the metal fitting for the headrest is manufactured by performing press processing on the cylindrical metal fitting, the metal fitting is formed into a cylindrical shape by seam welding. Processing itself is easy, and the crack of the cylindrical metal fitting in the seam portion can be avoided as much as possible.

  Furthermore, in an apparatus for manufacturing a headrest fitting by pressing a cylindrical fitting, the cylindrical fitting can be pressed from the upper part in the vertical direction, and the cylindrical fitting is molded into the cylindrical fitting. The edge of the recess can be formed at an acute angle.

  A method for manufacturing a headrest metal fitting according to the present invention will be described in detail below with reference to the accompanying drawings in relation to a headrest metal fitting mold and a headrest metal fitting manufacturing apparatus.

  FIG. 1 shows a metal mold 10 for a headrest according to the present invention. The forming die 10 is made of a metal solid rod-like body, and has a shape in which a flat portion 12 and a curved surface 14 are provided on a portion used for press working on one end side in the axial direction of the forming die 10. It is said. In this case, as understood from FIG. 1, the tip end portion is formed in a tapered shape. The other end is provided with a fixing portion 16 for positioning and fixing the mold 10 to the press machine during press working.

  Notch portions 18a to 18e are provided at equal intervals on the curved surface 14 on the shaft end side from a substantially half portion of the solid rod-shaped body along the axial direction. The notches 18a to 18e are arcuate surfaces having a diameter smaller than that of the curved surface 14, and are preferably formed by a method such as cutting. In addition, although five places are illustrated here as the notches 18a to 18e, it is a matter of course that the number may be increased or decreased instead of the notches 18a to 18e.

  FIG. 2 shows the cylindrical fitting (headrest fitting) 20 after press working. The cylindrical metal fitting 20 is substantially U-shaped, and a predetermined flat plate-shaped metal end face in the longitudinal direction is attached to each other, and seam welding is performed on that portion to form a cylindrical shape. As described above, the concave portions 24 a to 24 e are formed on one stay leg portion 22 a of the substantially U-shaped cylindrical metal fitting 20 by press working using the forming die 10. Preferably, the cylindrical metal fitting 20 has a seam portion on the opposite side of the portion where the recesses 24a to 24e are formed.

  3 and 4 show a headrest fitting manufacturing apparatus (press working apparatus) 26 according to the present invention. The manufacturing apparatus 26 mainly includes pressing portions 28 a to 28 c, a first holding portion 30 for holding the mold 10, second holding portions 32 a and 32 b for holding the cylindrical metal fitting 20, and a punch ( (Pressing protrusions) 34a to 34e and guide posts 36a and 36b.

  The first holding part 30 and the second holding part 32a are fastened and fixed to the base 38 by bolts 40a and 40b, respectively. Further, guide posts 36 a and 36 b are erected on the base 38.

  The first holding unit 30 fixes the mold 10 horizontally on the second holding unit 32b. The molding die 10 fixed as described above is inserted into the stay leg portion 22a on the side where the cylindrical metal fitting 20 is processed, and the cylindrical metal fitting 20 is sandwiched between the second holding portions 32a and 32b. At this time, the cylindrical metal fitting 20 is installed with the processing surface facing upward in the vertical direction.

  Above the first holding part 30 and the second holding parts 32a and 32b, pressing parts 28a to 28c and punches 34a to 34e for pressing the cylindrical metal fitting 20 are arranged. The pressing portions 28a and 28b are integrated by the bolt 40c, and the pressing portions 28b and 28c are fastened and fixed by the bolt 40d.

  The pressing portion 28a is formed in a substantially L shape in a planar shape, and, as shown in FIG. 4, when the cylindrical metal fitting 20 is held by the second holding portions 32a and 32b, the stay leg portion 22b on the side that is not processed. However, it is configured so as not to interfere with the processing by being positioned vertically above the stay leg 22a on the side to be processed.

  Further, the adjustment member 41 is fixed to the lower end surface of the pressing portion 28c with a bolt or the like (not shown). A plurality of types of adjusting members 41 having different thicknesses are prepared, and the adjusting member 41 having an appropriate thickness is fixed to the lower end surface of the pressing portion 28c, whereby the adjusting member 41 is formed on the cylindrical metal fitting 20 by pressure processing described later. It is possible to adjust the depth of the recesses 24a to 24e.

  Next, the bolt 42 penetrates the pressing portions 28b and 28c and the adjusting member 41 and is screwed into the second holding portion 32b, so that the pressing portions 28b and 28c, the adjusting member 41 and the second holding portion 32b are integrated. The In this case, a bearing 44 is provided in the pressing portion 28 c, and the shaft portion of the bolt 42 is allowed to be displaced with respect to the pressing portions 28 b and 28 c and the adjustment member 41.

  On the other hand, the pressing portion 28b is provided with holes 46a and 46b, into which guide posts 36a and 36b are respectively fitted.

  Further, punches 34a to 34e for pressing the cylindrical metal fitting 20 are fixed to the pressing portion 28b. The punches 34a to 34e pass through the pressing portion 28c and the second holding portion 32b, and are arranged so as to fit the upper portions of the notches 18a to 18e of the mold 10, respectively.

  In the manufacturing apparatus 26 configured as described above, the pressing portions 28a to 28c are movable up and down along the guide posts 36a and 36b and the bolt 42 by a driving source (not shown), and the pressing portions 28a to 28c are pressed down. As a result, the punches 34a to 34e are lowered to reach the notches 18a to 18e of the mold 10 so that a predetermined processing portion of the stay leg portion 22a of the cylindrical metal fitting 20 is pressed and the recesses 24a to 24e are pressed. Can be formed.

  Further, in this case, when the pressing portions 28a to 28c are pressed down, the adjustment member 41 fixed to the lower end surface of the pressing portion 28c is also lowered integrally and reaches the upper end surface of the second holding portion 32b. . As a result, the entire second holding portion 32b is pressurized, so that the depths of the recesses 24a to 24e with the cylindrical metal fitting 20 are adjusted by local pressurization processing using the punches 34a to 34e. .

  Next, the processing part in the process of performing the press process for obtaining the recessed parts 24a-24e in the cylindrical metal fitting 20 using the shaping | molding die 10 is demonstrated in detail. In the following description, the processing steps in the notch portion 18a are illustrated and described, and the processing steps in the notches 18b to 18e are substantially the same in configuration, and thus detailed description thereof is omitted.

  FIG. 5 shows a state where the molding die 10 is inserted into the cylindrical metal fitting 20 and shows a state before the cylindrical metal fitting 20 is pressed. 5A is a cross-sectional view taken along the longitudinal direction of the cylindrical metal fitting 20, FIG. 5B is a cross-sectional view taken along line VB-VB shown in FIG. 5A, and FIG. 5C is a cross-sectional view taken along line VC-VC. The punch 34a is positioned on the upper part in the vertical direction of the notch 18a of the forming die 10 with respect to the cylindrical fitting 20 in which the forming die 10 is inserted, and the recess 24a is press-formed in the cylindrical fitting 20.

  FIG. 6 shows a state in which the punch 34a is pressed down and pressed while the molding die 10 is inserted into the cylindrical metal fitting 20. As shown in FIG. 6A is a cross-sectional view taken along the longitudinal direction of the cylindrical metal fitting 20, FIG. 6B is a cross-sectional view taken along line VIB-VIB shown in FIG. 6A, and FIG. 6C is a cross-sectional view taken along line VIC-VIC.

  As shown in FIGS. 6A and 6B, the cylindrical metal fitting 20 is pressed by the pressing surface 48a of the punch 34a, whereby the cylindrical metal fitting 20 has a recess 24a corresponding to the notch 18a. Is formed. At this time, the width W1 of the pressing surface 48a is larger than the width W2 of the notch 18a, for example, W1 is 2.0 mm and W2 is 1.6 mm. Since W1 is larger than W2, a plastic flow is generated in the portion pressed by the press work, and the inside of the cylindrical metal fitting 20 flows along the punch 34a as indicated by an arrow A, and the concave portion has an acute edge. 24a is formed.

  After the recess 24a is formed, the cylindrical fitting 20 is rotated as shown in FIG. By rotating the cylindrical metal fitting 20, the flat surface portion 12 of the mold 10 inserted into the cylindrical metal fitting 20 becomes parallel to the lower end surface 50 a of the recess 24 a formed in the cylindrical metal fitting 20.

  As described above, the state after the cylindrical metal fitting 20 is rotated is shown in FIG. 7A shows a sectional view along the longitudinal direction of the cylindrical metal fitting 20, FIG. 7B shows a sectional view taken along the line VIIB-VIIB shown in FIG. 7A, and FIG. 7C shows a sectional view taken along the VIIC-VIIC line.

  As shown in FIG. 7, the lower end surface 50 a of the molded recess 24 a and the flat surface portion 12 become parallel, so that the cylindrical metal fitting 20 can be pulled out from the mold 10 without being obstructed by the recess 24 a. .

  As another embodiment, the concave portion in which the flat portion 12 of the molding die 10 is formed in the cylindrical metal fitting by rotating the molding die 10 before the step of pulling out the cylindrical metal fitting 20 after the press working. It may be parallel to the lower end surface 50a of 24a.

It is a whole perspective view of the metal mold | die for headrests concerning this invention. It is a front view of the metal fittings for headrest processed using the metal mold for headrests concerning this invention. It is sectional drawing of the manufacturing apparatus of the metal fitting for headrests concerning this invention. It is a side view of the manufacturing apparatus of the metal fitting for headrests concerning this invention. It is sectional drawing which shows the state before the press work which inserted the metal mold | die for headrest concerning this invention in the cylindrical metal fitting, FIG. 5A is sectional drawing along the longitudinal direction of a cylindrical metal fitting, FIG. 5B is shown in FIG. FIG. 5C is a cross-sectional view taken along line VC-VC. FIG. 6A is a cross-sectional view showing a state after the headrest metal fitting molding die according to the present invention is inserted into a cylindrical metal fitting and subjected to press working, FIG. 6A is a cross-sectional view along the longitudinal direction of the cylindrical metal fitting, and FIG. FIG. 6A is a cross-sectional view taken along line VIB-VIB shown in FIG. 6A, and FIG. 7C is a cross-sectional view taken along line VIC-VIC. FIG. 7A is a cross-sectional view of the cylindrical metal fitting into which the metal mold for headrest according to the present invention is inserted, just before being pulled out of the mold after press working, and FIG. 7A is a cross-sectional view along the longitudinal direction of the cylindrical metal fitting, FIG. 7B is a cross-sectional view taken along line VIIB-VIIB shown in FIG. 7A, and FIG. 7C is a cross-sectional view taken along line VIIC-VIIC. It is a reference perspective view which shows the use condition of the metal fitting for headrests.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Mold 12 ... Plane part 14 ... Curved surface 16 ... Fixed part 18a-18e ... Notch part 20 ... Cylindrical metal fittings 22a, 22b ... Stay leg part 24a-24e ... Recessed part 26 ... Manufacturing apparatus 28a-28c ... Press part 30 ... 1st holding | maintenance part 32a, 32b ... 2nd holding | maintenance part 34a-34e ... Punch 36a, 36b ... Guide post 38 ... Base 40a-40d, 42 ... Bolt 41 ... Adjustment member 44 ... Bearing 46a, 46b ... Hole 48a ... Press surface 50a ... lower end surface W1, W2 ... width

Claims (5)

A headrest fitting mold for producing a headrest fitting by pressing a cylindrical fitting and forming a recess for adjusting the height of the headrest,
The molding die is composed of a rod-shaped body, and has a plane portion formed along the longitudinal direction of the rod-shaped body, and a curved surface connected to the plane portion.
The curved surface has a notch for forming a recess in the cylindrical metal fitting by pressing,
The headrest fitting mold, wherein the notch has a smaller diameter than the curved surface and is formed in an arc shape. By inserting a molding die made of a rod-like body into a cylindrical fitting formed by seam welding, the cylindrical fitting is pressed to produce a headrest fitting having a recess for adjusting the height of the headrest. A method,
The mold has a flat portion formed along the longitudinal direction of the rod-shaped body and a curved surface connected to the flat portion, and the curved surface is formed by pressing to form a recess in the cylindrical metal fitting. Has a notch,
Inserting the mold into the cylindrical fitting held by a holding member;
Forming a recess in the cylindrical fitting by performing a press process on the cylindrical fitting with the molding die inserted therein;
Rotating the mold so that the flat portion of the mold is parallel to the lower end surface of the recess;
A method of manufacturing a headrest bracket comprising the step of pulling out the mold from the cylindrical bracket. By inserting a molding die made of a rod-like body into a cylindrical fitting formed by seam welding, the cylindrical fitting is pressed to produce a headrest fitting having a recess for adjusting the height of the headrest. A method,
The mold has a flat portion formed along the longitudinal direction of the rod-shaped body and a curved surface connected to the flat portion, and the curved surface is formed by pressing to form a recess in the cylindrical metal fitting. Has a notch,
Inserting the mold into the cylindrical fitting held by a holding member;
A step of forming a recess in the cylindrical metal fitting by pressing the cylindrical metal fitting into which the mold is inserted;
Rotating the cylindrical fitting to make the flat portion of the mold parallel to the lower end surface of the recess;
A method of manufacturing a headrest fitting, comprising: removing the cylindrical fitting from the mold. In the manufacturing method of the bracket for headrests of Claim 2 or 3,
The cylindrical metal fitting is a member seam welded along the longitudinal direction,
A method for manufacturing a headrest metal fitting, wherein a concave portion is formed in the cylindrical metal fitting by pressing a portion of the cylindrical metal fitting opposite to a seam welded portion of the cylindrical metal fitting. . By inserting a molding die made of a rod-like body into a cylindrical fitting formed by seam welding, the cylindrical fitting is pressed to produce a headrest fitting having a recess for adjusting the height of the headrest. A press working device,
The mold has a flat portion formed along the longitudinal direction of the rod-shaped body and a curved surface connected to the flat portion, and the curved surface is formed by pressing to form a recess in the cylindrical metal fitting. Has a notch,
A holding member for holding the mold;
A holding member for holding the cylindrical fitting;
A pressing protrusion for forming a concave portion by pressing the cylindrical metal fitting into which the molding die is inserted,
The cylindrical metal fitting is subjected to press work from the top in the vertical direction,
A press working apparatus for manufacturing a headrest metal fitting, wherein a width of a pressing surface of the pressing protrusion is larger than a width of the notch of the molding die.

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