JP3810650B2 - Mold for forming headrest bracket and method for manufacturing headrest bracket - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mold for producing a headrest metal fitting and a method for producing a headrest metal fitting.
[0002]
[Prior art]
It is obliged to attach a headrest to the seat of an automobile to ensure safety. As shown in FIG. 7, the headrest 2 includes a headrest metal fitting 4 and a headrest main body 6, and a horizontal portion 8 of the metal fitting 4 is housed in the headrest main body 6 and the tip portions of the vertical portions 10a and 10b. Enters the back sheet 12 and is fixed. In this case, a plurality of recesses 14 are formed inside the vertical portions 10a and 10b so that the height of the headrest 2 can be adjusted to match the head of the occupant.
[0003]
In the prior art, the concave portion 14 of the metal fitting 4 is made of a solid metal rod, and the concave portion 14 is formed by cutting the rod. However, in today's automobile parts, weight reduction is an important issue for improving fuel efficiency and performance, and the headrest is no exception.
[0004]
[Problems to be solved by the invention]
Therefore, in order to reduce the weight of the headrest, weight reduction has been achieved by using a hollow metal fitting instead of the metal fitting 4 made of a solid rod. However, in the case of a hollow metal fitting, if the above-described cutting process is used to form the height adjustment concave portion of the headrest body, a hole reaching the internal space from the outer periphery of the hollow metal fitting is formed and the strength deteriorates. There is a problem that.
[0005]
On the other hand, it is conceivable to use press working instead of cutting. In general, when pressing is performed, as shown in FIG. 8, a receiving die 15 that cooperates with a pressing die that achieves a pressing function is required. For example, assuming that the cross-sectional shape of the receiving die 15 is such that the perfect circle 16 and the ellipse 17 are alternately formed (see FIG. 9), the cross-sectional shape of the receiving die 15 bulges inward particularly following the portion of the ellipse 17 When the concave portion is formed, if the receiving die 15 is to be removed from the work, there is an inconvenience that the portion of the perfect circle 16 gets in the way and cannot be removed.
[0006]
The present invention has been made in consideration of the various problems described above, and when forming a plurality of recesses for adjusting the height of the headrest body by pressing a hollow metal fitting, the mold is attached to the metal mold after the pressing. It is an object of the present invention to provide a headrest fitting forming mold and a method of manufacturing the headrest fitting that can be pulled out more and can sufficiently secure strength.
[0007]
[Means for Solving the Problems]
The present invention is a mold for forming a headrest fitting for pressing a cylindrical fitting and producing a headrest fitting having a recess,
The molding die is composed of a rod-shaped body, and has a flat portion formed along the longitudinal direction of the rod-shaped body and a curved surface connected to the flat portion.
A first step surface connected at one end to the curved surface between the flat portion and the curved surface, and a second step connected to the other end portion of the first step surface and the flat portion. A surface is formed, an angle between the first step surface and the second step surface is 135 degrees, an angle between the second step surface and the plane portion is 120 degrees,
The first step surface is a molding surface, and the flat surface portion is opposed to a recess formed in the metal fitting by press working so that the molding die can be removed from the metal fitting.
[0008]
In addition, the present invention provides a method for manufacturing a headrest fitting that forms a recess for adjusting the height of the headrest by using a cylindrical fitting .
Forming shape type comprises a rod-shaped body, and a curved surface which is connected to the flat portion and the formed flat portion along a longitudinal direction of said rod-like body,
A first step surface connected at one end to the curved surface between the flat portion and the curved surface, and a second step connected to the other end portion of the first step surface and the flat portion. surface and is formed, an angle of 135 degrees between the first step surface and the second stepped surface, the angle between the second step surface and the flat part is 120 degrees,
Inserting the mold into the bracket;
A pressing step in which pressing is performed with the first stepped surface facing the press die in the metal fitting into which the forming die is inserted;
A rotating step of rotating the molding die to oppose the flat portion to the press die;
It is characterized by comprising a drawing step of drawing the flat part from the metal fitting while facing the press die.
[0009]
According to the present invention, when forming a recess in a hollow metal fitting with a molding die, it is avoided that a hole reaching the internal space is made, and sufficient strength is ensured. In addition, since the mold itself has a simple structure, it is easy to handle and the manufacturing cost can be reduced.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of the method for manufacturing a headrest fitting according to the present invention will be described in detail below with reference to the accompanying drawings, with reference to a preferred embodiment in relation to a mold for producing a headrest fitting.
[0011]
FIG. 1 shows a headrest fitting 20 manufactured by the manufacturing method according to the present embodiment. The metal fitting 20 is composed of a hollow metal rod 22 and has a plurality of recesses 23a to 23e formed by pressing.
[0012]
The headrest metal fitting 20 uses a molding die 24 shown in FIG. 2 when processing the recesses 23a to 23e. The said shaping | molding die 24 is a metal solid rod which has the circular arc surface in which the plane part 26 was formed along the longitudinal direction, and has several notch parts 25a-25e in the middle.
[0013]
A cross section of the notch 25a is shown in FIG. Detailed descriptions of the cutout portions 25b to 25e configured similarly to the cutout portion 25a are omitted. The notch 25a has a first step surface 32 parallel to a virtual plane 30 passing through the axis 28 of the mold 24, and a second step reaching the flat surface portion 26 with an obtuse angle from the first step surface 32. Surface 34.
[0014]
In this case, the angle θ1 between the first step surface 32 and the second step surface 34 is preferably 135 degrees in the present embodiment, and the angle θ2 between the second step surface 34 and the flat portion 26 is preferably 120 degrees. The first step surface 32 and the second step surface 34 are formed by cutting a solid rod body.
[0015]
Next, a method for manufacturing the headrest fitting 20 manufactured by pressing the metal rod 22 using the above-described mold 24 will be described.
[0016]
First, as shown in FIG. 4A, the mold 24 is inserted into the hollow metal rod 22. As easily understood from FIG. 4A, in this case, the first step surface 32 is opposed to the pressing surfaces 42 a to 42 e on the lower end plane of the punch 40. Here, the pressing surfaces 42a to 42e correspond to the recesses 23a to 23e. 4B and 4C, reference numeral 44 indicates a jig for holding the rod 22.
[0017]
The punch 40 is pressed down against the metal rod 22 through the above preparation steps. As a result, as shown in FIGS. 5A and 5B, the metal bar 22 is formed with recesses 23 a to 23 e by pressing the pressing surfaces 42 a to 42 e of the punch 40. In this case, the first stepped surface 32 does not extend over the entire width of the pressing portions 42a to 42e of the punch 40, but substantially becomes planar concave portions 23a to 23e when pressed (see FIG. 5B).
[0018]
When the recesses 23a to 23e are formed, the mold 24 is then rotated as shown in FIG. 6B. That is, it is made to oppose so that the lower end surface of the recessed parts 23a-23e and the plane part 26 may become parallel.
[0019]
In this rotation, in order for the second step surface 34 to rotate without being obstructed by the recesses 23a to 23e, as shown in the sectional view of FIG. 3, the rotation locus of the vertex 50 forming the angle θ1 is the recess 23a. What is necessary is just not to contact | abut to the lower end surface of -23e.
[0020]
FIG. 6C shows a state where the mold 24 is rotated. Thus, if the lower end surfaces of the recesses 23a to 23e and the flat portion 26 are parallel, the molding die 24 can be easily pulled out from the headrest fitting 20 without being obstructed by the recesses 23a to 23e.
[0021]
As described above, in the headrest bracket manufacturing mold and the headrest bracket manufacturing method according to the present embodiment, the mold 24 is inserted into the hollow metal rod 22 and press working is performed. By forming the recesses 23 a to 23 e in the metal rod body 22 and rotating the mold 24 by a predetermined angle, the mold 24 can be easily pulled out from the metal rod body 22.
[0022]
【The invention's effect】
As described above, according to the headrest metal fitting manufacturing mold and the headrest metal fitting manufacturing method according to the present invention, a plurality of recesses for adjusting the height of the headrest body can be obtained by pressing the cylindrical metal fitting. Can be easily formed without particularly degrading the strength, and since the mold has a simple structure, it is easy to handle, and the manufacturing cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a front view of a headrest fitting according to the present embodiment.
FIG. 2 is a perspective view of a mold for producing a headrest fitting.
FIG. 3 is a cross-sectional view showing first and second step surfaces of a mold for producing a headrest fitting.
4A is a side cross-sectional view of a state where a metal mold for forming a headrest fitting is inserted into a metal rod, FIG. 4B is a view taken along line IVB-IVB in FIG. 4A, and FIG. 4C is an IVC in FIG. It is the figure along the -IVC line.
5A is a side cross-sectional view of a state where a metal mold for forming a headrest fitting is inserted into a metal rod body and pressed, FIG. 5B is a view taken along line VB-VB in FIG. 5C is a view taken along the line VC-VC in FIG. 5A.
6A is a side cross-sectional view of a state in which a mold for producing a headrest fitting is rotated after press working, FIG. 6B is a view taken along line VIB-VIB in FIG. 6A, and FIG. 5C is IVC- in FIG. It is the figure along the IVC line.
FIG. 7 is a perspective view of a headrest fitting, a headrest, and a back seat according to the related art.
FIG. 8 is a perspective view of a receiving mold for a headrest fitting as a comparative example.
9 is a view taken along line IX-IX in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 2 ... Headrest 4 ... Headrest metal fitting 6 ... Headrest main body 14 ... Recess 15 ... Receptacle 20 ... Headrest metal fitting 22 ... Metal rod body 23a-23e ... Recess 24 ... Mold 25a-25e ... Notch 32 ... 1st Step surface 34 ... Second step surface

Claims (2)

A pressing tool for a cylindrical metal fitting, a headrest metal fitting forming mold for producing a headrest metal fitting having a recess,
The molding die is composed of a rod-shaped body, and has a flat portion formed along the longitudinal direction of the rod-shaped body and a curved surface connected to the flat portion.
A first step surface connected at one end to the curved surface between the flat portion and the curved surface, and a second step connected to the other end portion of the first step surface and the flat portion. A surface is formed, an angle between the first step surface and the second step surface is 135 degrees, an angle between the second step surface and the plane portion is 120 degrees,
The headrest fitting is characterized in that the first step surface is a molding surface, and the flat portion is opposed to a recess formed in the fitting by press working so that the molding die can be removed from the fitting. Mold for making. In the method of manufacturing a headrest bracket for forming a recess for adjusting the height of the headrest by using a cylindrical bracket ,
Forming shape type comprises a rod-shaped member, which is connected to the flat portion and the flat portion formed along a longitudinal direction of said rod-like body and a curved surface, the curvature between the curved surface and the planar portion face to being second and the step surface which one end is connected to the other end portion and the flat portion of the first step surface and the first step surface that is connected is formed, the first The angle between the step surface and the second step surface is 135 degrees, and the angle between the second step surface and the plane portion is 120 degrees,
Inserting the mold into the bracket;
A pressing step in which pressing is performed with the first stepped surface facing the press die in the metal fitting into which the forming die is inserted;
A rotating step of rotating the molding die to oppose the flat portion to the press die;
A method for producing a headrest metal fitting, comprising: a drawing step of drawing the flat portion from the metal fitting while facing the press die.

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