JP3281308B2 - Method of manufacturing belt mounting bracket for seat belt device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a belt mounting bracket for a seat belt device for mounting a belt end of an automobile seat belt to a fixed portion such as a vehicle body.

[0002]

2. Description of the Related Art Conventionally, a belt mounting bracket of this type is known as shown in FIG. That is, the belt mounting bracket is formed by forming the bolt hole 3 and the long hole 69 in the substrate (plate-like body) 2, and is fixed to a fixed portion such as a vehicle body via the bolt hole 3, and the long hole 69 is formed. The connection with the belt 13 is achieved.

The belt 13 is made of, for example, a strip-shaped narrow woven fabric woven of polyester fibers.
Is folded back at one of the long edges 691 to apply tension to the one long edge 691. The one long edge 691 has the same dimension in the thickness direction as the thickness of the substrate 2.

[0004]

However, in the above-mentioned conventional belt mounting bracket, the dimension in the thickness direction of one long edge portion 691 is the same as the thickness of the substrate 2, so that the belt 13
There is a disadvantage that the surface pressure acting on the surface is high.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to reduce the surface pressure acting on a belt.
It is to provide a manufacturing method of.

[0006]

To achieve the above object, the invention according to claim 1 is a method for manufacturing a belt mounting bracket for a seat belt device formed of a plate-like body,
A long hole for inserting a belt is formed in the plate-like body, and a ridge projecting from one of the one surface and the other surface of the plate-like body is formed at an edge of the long hole. A piercing step of punching the pilot hole of the long hole from the plate-like body, and a shear edge portion (burr) generated by the piercing step is pressed by face pressing. A face pressing step to remove, and a punch larger than the prepared hole is pushed into the prepared hole to form a long hole, and a part of the plate-like body is protruded along the long hole to form a convex line. Burring step, and pressing the ridges formed in this burring step, from the surface of the plate-shaped body
Forming a ridge with a constant height; and forming the ridge with the constant height.
And a curved surface forming step of forming a front end of the curved surface into a smooth curved surface .

According to a second aspect of the present invention , there is provided a method of manufacturing a belt mounting bracket for a seat belt device formed of a plate-like body, wherein the plate-like body has an elongated hole into which a belt is inserted. In the method for manufacturing a belt mounting bracket for a seat belt device, the edge of the long hole has a ridge protruding from one of the one surface and the other surface of the plate-like body. A piercing step of punching out the prepared hole of the elongated hole from the shape, a face-pressing step of removing a shear edge portion (burr) generated by the piercing step by face-pressing, and pushing a punch larger than the prepared hole into the prepared hole. A burring step in which a long hole is formed, a part of the plate-like body is protruded along the long hole to form a ridge, and the ridge formed in the burring step is subjected to surface pressure to form a plate. Body table
Forming a ridge with a constant height from the surface;
And the curved surface forming step for the tip of the convex shaped into a smooth curved surface, and as engineering you molded smoothly rounded rising edge portion opposite to the projections in the long hole, disconnecting the predetermined shape of the belt mounting bracket And a separation step.

According to the first aspect of the present invention, by projecting a part of the plate-like body from one surface side of the plate-like body to the other surface side, the ridge projecting from the other surface is formed. Since it is formed, the ridge can be made to protrude greatly from the other surface, and a part of the plate-like body is removed from the other surface side by removing a shear edge portion (burr) generated by punching by surface pressing. Since it is bent, the ridge can be projected out neatly. Therefore, it is possible to increase the area where one of the long edges hits the belt.
That is, the surface pressure acting on the belt from one long edge can be sufficiently reduced. Therefore, it is possible to improve the durability of the belt and the strength of the belt mounting bracket, and to improve the safety with the improvement of the durability and the strength.

Further, a shear edge portion generated in the piercing step
(Burr) is removed in the face-pressing process.
In the grinding process, the ridge can be projected out neatly
In the curved surface forming process, the convex corners are curved
It can be molded neatly into a shape .

[0010] In the invention according to claim 2, the elongated hole is provided.
The rising edge on the opposite side of the raised ridge is smoothly rounded
Process, the rise on the opposite side of the elongated hole from the ridge is
The edge is smoothly rounded with a larger radius of curvature
be able to. For this reason, it is necessary to form the belt mounting bracket.
Can the corners be rounded in a series of pressing processes?
Need to perform finishing and coating in separate processes
Disappears. Therefore, the cost can be reduced.
You .

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. First, a first embodiment of the present invention will be described with reference to FIGS.

In FIG. 5, S is a car body, D is a driver's seat, and 1 is a seat belt device. A shoulder belt retractor 11 is fixed to the vehicle body S, and a shoulder belt 12 is connected to the retractor 11. A belt mounting bracket A1 is fixed to the vehicle body S on one side of the seat D, and a waist belt 13 is connected to the belt mounting bracket A1. These shoulder belts 12
The waist belt 13 is formed by a single belt. A shoulder belt 12 is provided on the retractor 11 side and a waist belt 13 is provided on the belt mounting bracket A1 side with a tongue 14 provided in the middle as a boundary.

The tongue 14 is detachably connected to a buckle 15.
Is connected to another belt mounting bracket A2 via the connection belt 151.
Is to be connected to. This belt mounting bracket A
Reference numeral 2 is fixed to the vehicle body S on the opposite side of the belt mounting bracket A1 across the sheet D. Since these belt mounting brackets A1 and A2 have almost the same configuration,
The configuration will be described in detail while using the reference numerals of the belt mounting bracket A1.

As shown in FIGS. 1 and 2, the belt mounting bracket A1 is formed by a plate-like substrate (plate-like body) 2, and is slightly bent at a bent portion 2a to form a "-" shape. One side is a fixed plate portion 21 and the other side is a winding plate portion 22 with the bent portion 2a as a boundary.
Bolt holes 3 are formed in the fixing plate portion 21, and a plurality of curved ridges 31 are formed radially and equidistantly at the periphery of the bolt holes 3 (in the case of this embodiment). Are formed three). Each curved ridge 31 is formed so as to project from one surface side of the substrate 2 to the other surface side by press working. Note that the number of the curved protrusions 31 is not limited, and the curved protrusions 31 may be configured to be provided radially finely like a chrysanthemum.

[0015] As shown in FIG.
The fixing bolt 5 is inserted, and the fixing bolt 5 and the nut 5
1, the board 2 is fixed to the vehicle body S. At this time, the curved ridge 31 acts in the same manner as a spring washer (spring washer), and also acts as a detent due to an increase in friction, thereby helping to securely fix the substrate 2 to the vehicle body S. On the other hand, there is no need to use a spring washer that has always been used in the past, and the required number of parts can be reduced.

On the other hand, the winding plate portion 22 of the substrate 2
Slot 6 for inserting and connecting one end of waist belt 13
Has been opened. The waist belt 13 is folded back at one long edge 691 in the long hole 6, and the one long edge 69
1 is applied with tension. One long edge portion 691 receiving the tension is curved such that the central portion in the longitudinal direction projects in the direction opposite to the direction in which the tension is applied. The waist belt 13 is formed by forming a belt-shaped narrow woven fabric in which polyester fibers are woven into a flat shape in the same manner as that shown in the conventional example. It is folded back at the long edge 691, and the folded back portion is sewn to the waist belt 13 to be fixed to the substrate 2.

The other long edge 692 facing one long edge 691 is also curved in the same direction as the one long edge 691. A portion where one of the long edge portions 691 and the other long edge portion 692 are connected to each other forms arc-shaped short edge portions 7 and 7 that are smoothly continuous.

The one and the other long edge 6
The long hole 6 consisting of 91, 692 and short edges 7, 7 is shown in FIG.
It is formed as shown in FIG. That is, the elongated hole 6 has an arc-shaped inner surface 61 extending from one surface 22a side of the substrate 2 to the elongated hole 6 and a convex projecting from the elongated hole 6 toward the other surface 22b in an arc shape. Article 611. The inner surface 61 and the ridge 611 are formed by press working.

In the belt mounting bracket for a seat belt device configured as described above, the central portion of one long edge 691 is curved so as to protrude in the direction opposite to the tension of the waist belt 13. Even if one long edge 691 is elastically deformed in the direction of the tension, the one long edge 691 is not deformed concavely in the direction of the tension. Therefore, the belt does not collect on the concave portion, and the width of the waist belt 13 is always maintained at a normal width. As a result, the tension of the waist belt 13 is always evenly distributed on the one long edge portion 691, so that the strength performance of the waist belt 13 and the belt mounting bracket A1 is improved, and the safety is improved in accordance with the improved strength. Performance can be improved.

Since the other long edge 692 is curved similarly to the one long edge 691, in order to maintain the flat state of the waist belt 13, the waist belt 13 is moved along its longitudinal center line. When the waist belt 13 is inserted into the long hole 6 while being bent so as to bend along the waist belt 13, the shape of the one and the other long edge portions 691 and 692 substantially matches the curved shape of the waist belt 13, 6 becomes extremely easy to insert.

Moreover, one and the other long edge portions 691, 6
Since the connecting portions of 92, that is, the short edges 7, 7 are formed in a smooth arc shape, even if both ends along the longitudinal direction of the waist belt 13 are in an arc shape, the waist belt 13 is inflated. There is an advantage that the waist belt 13 can be easily inserted into the long hole 6 without the portion hitting the short edge portions 7. In addition, both ends of the waist belt 13 just fit into the short edges 7, 7, and the waist belt 1
When tension is applied to the belt 3, the waist belt 13 can be stably held at a predetermined position of the slot 6.

Further, the long hole 6 is formed on one surface 22a of the substrate 2
An arc-shaped inner surface 61 is formed from the side to the inside of the elongated hole 6,
Since the protruding ridge 611 protruding in an arc shape is formed on the other surface 22 b side from the inside of the long hole 6, the waist belt 13 folded back at one long hole edge 691 may hit the corner and be cut off. Can be removed. Moreover, the ridge 6
11, the area of contact with the waist belt 13 is increased, so that the surface pressure acting on the waist belt 13 can be reduced, and the durability and reliability of the waist belt 13 can be improved.

Further, since the ridges 611 are formed over the entire elongated hole 6, the strength around the elongated hole 6 is improved, and the strength of the entire belt mounting bracket A1 can be improved. . In particular, since the short edge portion 7 can be strengthened, even if the terminal portions of the waist belt 13 gather at the short edge portion 7 and force concentrates on the short edge portion 7, the short edge 7 The safety of the unit 7 can be improved more than ever.

When tension acts on the waist belt 13,
The waist belt 13 folded back at one long edge 691 comes into close contact with one long edge 691. That is, the folded portion of the waist belt 13 is curved into a shape similar to that of the one long edge portion 691, and the central portion in the width direction has a raised shape. For this reason, the waist belt 13 has one long edge portion 69.
1 is hard to shift in the horizontal direction. Therefore, even if the direction of the tension of the waist belt 13 does not coincide with the direction orthogonal to the one long edge 691, the waist belt 13 is shifted laterally along the one long edge 691, and the end of the long hole 6 It will not be gathered in the club.

Further, since the central portion in the width direction of the waist belt 13 has a raised shape like the one long edge portion 691, the waist belt 13 is in a state of being always widened in the width direction. Therefore, even if the tension is applied to the waist belt 13 so that the waist belt 13 converges to become thin, the width of the waist belt 13 is maintained at the original wide state at the one long edge portion 691. Will be. That is, the waist belt 13 does not gather at a part on one long edge 691. As described above, the width of the belt folded portion is appropriately maintained at one of the long edges, so that the tension of the belt is uniformly transmitted to the one long edge, and the durability and durability of the belt are improved. Safety can be improved with the improvement of the strength performance of the belt mounting bracket.

Next, a second embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. This embodiment is different from the first embodiment in that the shape of the long hole 6 is different, and the other points are the same as those in the first embodiment, and therefore the description thereof is omitted.

That is, one and the other long edge portions 691,
The long hole 6 composed of the short edge portions 692 and the short edge portions 7
As shown in (a), (b), and (c), a portion corresponding to the long hole 6 is formed into a concave shape by a plurality of press workings, and then the bottom of the concave portion is pulled out to form one of the substrates 2. Surface 22a
Is formed on the other surface 22b side. At this time, a curved surface R1 curved in an arc shape is formed from the one surface 22a to the inner surface of the protruding piece 23. And
As shown in FIG. 6D, the tip of the protruding piece 23 is further pressed by the press forming (curling) to the other surface 22b.
Wrap to get closer to. Thereby, the other surface 22b
A ridge 611 that protrudes greatly on the side is formed,
A smoothly curved surface R2 is formed from the inner surface of the long hole 6 to the ridge 611.

Accordingly, in the belt mounting bracket for a seat belt device configured as described above, since the elongated holes 6 are formed by drawing the substrate 2, the height of the ridges 611 becomes particularly high. On the other hand, the area of one long edge portion 691 to which the waist belt 13 contacts is larger than in the case of the first embodiment. Therefore, the surface pressure acting on the waist belt 13 is reduced, and the durability of the waist belt 13 and the safety can be further improved. Also, one long edge 6
Curved surfaces R1 and R2 are formed at the corners where the waist belt 13 is folded in 91, respectively.
There is no danger that the sheet is rubbed and cut at one long edge 691. The other operations and effects are the same as those of the first embodiment.

Next, a third embodiment of the present invention will be described with reference to FIGS. However, components common to those of the first embodiment shown in FIGS. 1 to 5 are denoted by the same reference numerals, and description thereof will be simplified.

As shown in FIG. 7, the belt mounting bracket A1 is bent at a substantially right angle at the bent portion 2a, and the elongated hole 6 is formed in the winding plate portion 22. The elongated hole 6 is formed with one protruding ridge 611a and the other protruding 611b protruding toward one surface 22a and the other surface 22b, respectively. That is, the elongated hole 6 is formed such that the width of the inner surface is formed thick by the one ridge 611a and the other ridge 611b, and the area of one long edge portion 691 with which the waist belt 13 contacts is formed to be large. .

The one ridge 611a and the other ridge 611b are used to connect a part of the substrate 2 to one surface 22a of the substrate 2.
By bending (burring) from one side to the other surface 22b side, a protruding ridge protruding from the other surface 22b is formed, and the protruding ridge is moved to the one surface 22a side by a press, thereby forming one surface. 22a and the other surface 2
It is formed so as to project to the side 2b. Therefore, the amount of projection of the one ridge 611a and the other ridge 611b is determined by the amount by which the substrate 2 is first bent (extended amount). In addition, each ridge 611
a and 611b have rounded tips. That is, regarding one long edge portion 691, the corner portion is formed to be round along the direction in which the waist belt 13 is folded. Further, C.sub.
A chamfer 2b is formed. Further, on the substrate 2, a mark S 10 is formed around the bolt hole 3.

Belt mounting bracket A constructed as described above
In FIG. 1, since the amount of protrusion of each of the one ridge 611 a and the other ridge 611 b can be increased in accordance with the amount of bending (overhang) of the substrate 2, the waist at one long edge 691 can be reduced. The area of the portion where the belt 13 contacts can be made sufficiently large as needed. Therefore, the surface pressure acting on the waist belt 13 from the one long edge portion 691 can be sufficiently reduced, and the safety is improved with the improvement of the durability of the waist belt 13 and the strength performance of the belt mounting bracket A1. be able to.

Further, each of the ridges 611a and 611b is formed in a round shape, and the corners of the ridge are formed in a round shape along the direction in which the waist belt 13 is folded at one long edge portion 691. The waist belt 1
3 can be prevented from being damaged. Moreover,
Since the corners of the ridge are rounded, it is not necessary to coat this ridge with a coating such as PVC or polyethylene.
The cost required for such a coating process can be reduced. That is, cost can be reduced.

Next, a method of manufacturing the belt mounting bracket A1 configured as described above will be described.

First, as a first step, as shown in FIG.
A die K1 and a punch K are formed on a steel sheet S as a material of the substrate 2.
The first pilot hole S1 for forming the long hole 6 is formed by using the second hole 2. Next, as shown in FIG. 9, as a second step, an arc-shaped roundness S1a is formed from the upper portion of the first pilot hole S1 to the upper surface of the steel plate S using the molds K3 and K4.
Further, as a third step, as shown in FIG.
Then, using the mold K6, an arc-shaped roundness S1b is formed from the lower portion of the first pilot hole S1 to the lower surface of the steel plate S.

Next, as a fourth step, as shown in FIG. 11, the first pilot hole S1 is bent upwardly of the steel sheet S using a mold K7 and a mold K8 (burring processing).
A second pilot hole S2 is formed. Then, as a fifth step, as shown in FIG. 12, the mold K9, the mold K10, and the mold 11
Then, the portion of the second pilot hole S2 protruding upward is pressed downward to form convex portions S3 and S4 protruding from the upper and lower surfaces of the steel sheet S at substantially the same height.

Further, as shown in FIG. 13, as a sixth step, using a mold K12 and a mold K13, the upwardly projecting convex portion S3 is finished so as to draw a smooth curved surface as a whole (restriction processing). . At this time, the surface of the second pilot hole S2 is also finely finished. Next, as a seventh step, as shown in FIG. 14, using a mold K14 and a mold K15, the protruding portion S4 protruding downward is finished so as to draw a smooth curved surface as a whole (rest-like processing). Also at this time, the surface of the second prepared hole S2 is finely finished. Then, the elongated hole 6 is formed by the second prepared hole S2 thus finished, and the one ridge 611a and the other ridge 611a are formed by the protrusions S3 and S4.

Next, as an eighth step, as shown in FIG. 15, a mold K21, a punch K22 and stamping dies K23 and K2 are formed.
4, a bolt hole 3 is made in the steel plate S, and a mark is formed around the bolt hole 3. Then, FIG.
As shown in the figure, the bolt hole 3 is drilled, and the state where the mark S10 is carved is obtained. Further, as shown in FIG. 17, as a ninth step, the outer periphery of the belt mounting bracket is cut using dies K25, K26 and K27 (trim processing).
At this time, since the cut steel sheet S enters the mold K27,
It is ejected by the ejector device K28. Then, a shape close to the belt mounting bracket as shown in FIG. 18 is obtained. Next, as a tenth step, as shown in FIG.
9 and a mold K30 are used to form a C chamfer 2b. Then, as shown in FIG. 20, the C-chamfer 2b is formed on the belt mounting bracket. Then, as shown in FIG. 21, as an eleventh step, the steel sheet S serving as the belt mounting bracket is bent at a substantially right angle along the bent portion 2a using the mold K31 and the mold 32. Thereby, as shown in FIG. 22, the belt mounting bracket A1 is completed.

As described above, the belt mounting member A1 is formed from the steel sheet S by press working. Further, the method of manufacturing the belt mounting bracket A1 has been described as being divided into 11 steps as described above. However, in practice, the method is further divided into more steps, and a method of forming while gradually deforming is employed.

In the third embodiment, the ridges are formed so as to protrude on one surface 22a and the other surface 22b of the substrate 2. However, the ridges are formed on the one surface 22a. And may be formed so as to protrude only on one side of the other surface 22b. The method of forming the ridge protruding only on one side follows the fourth step shown in FIG.
The fifth to seventh steps shown in FIGS. 23 to 25 may be performed.

That is, by the fourth step shown in FIG.
After bending the first pilot hole S1 above the steel plate S to form the second pilot hole S2, as shown in FIG. 23, as a fifth step, using the die K15 and the die K16. Then, the portion of the second pilot hole S2 protruding upward is pressed downward to form a convex portion S3 protruding from the upper surface of the steel sheet S to a substantially constant height.

Further, as a sixth step, as shown in FIG. 24, using a mold K17 and a mold K18, an edge S5 on the opposite side of the convex portion S3 protruding upward is finished so as to draw a smooth curved surface. At this time, the surface of the second pilot hole S2 is also finely finished. Next, as a seventh step, as shown in FIG.
Using the mold K19 and the mold K20, the convex portion S3 protruding upward is finished so as to draw a smooth curved surface as a whole. Also at this time, the surface of the second prepared hole S2 is finely finished. The elongated hole 6 is formed by the second prepared hole S2 thus finished. In addition, the protrusion S3 forms a protrusion 611 protruding, for example, on the other surface 22b side of the belt mounting bracket A1.

In the first to third embodiments, the configurations of the belt mounting bracket A1 and the waist belt 13 have been described in detail. However, the belt mounting bracket A2 and the connection belt 151 are also provided with the belt mounting bracket A1. And the waist belt 13. Further, the belt is not limited to the waist belt 13 and the connection belt 151, but may be the shoulder belt 12 or another belt.
Further, in each of the above-described embodiments, the belt is formed by forming a tubular member into a flat shape, but the belt may be formed simply into a flat plate shape.

The other long edge 692 is also curved in the same manner as the one long edge 691, but the other long edge 692 is formed in a straight line or other shape. It may be. However, the other long edge portion 692
Also, it is preferable that the belt be formed so as to be curved substantially in the same manner as the one long edge portion 691 in order to make it easy to insert the belt into the long hole.

Further, the protruding ridges 611 are formed on the entire long hole 6, but may be formed only on one long edge portion 691, that is, only on the portion where the waist belt 13 or the like abuts. . In addition, the short edge portion 7 does not necessarily need to be formed in an arc shape, but in order to facilitate insertion of the waist belt 13 and the like and to reduce stress concentration applied to this portion, an arc-shaped curved shape is used. It is preferable to form it.

Further, one or the other long edge portions 691 and 692 in the second embodiment are formed so as to form the curved surfaces R1 and R2 only at both end portions, but the entire inner surface including both end portions has a circular shape. It may be formed to have a curved surface such as an arc shape or an elliptical shape.

Further, the one long edge 691 is curved such that the central portion in the longitudinal direction projects in the direction opposite to the direction in which tension is applied.
May be formed so as to swell in the direction opposite to the tension of the belt from both ends in the longitudinal direction toward the center. That is, as long as the central portion in the longitudinal direction of one long edge portion 691 is raised with respect to both ends, the central portion may be flat as shown in FIG.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
8 will be described. However, the first shown in FIGS.
Elements common to the constituent elements of the embodiment are denoted by the same reference numerals, and description thereof will be simplified. This fourth embodiment is the first
The difference from the embodiment is that one long edge 691 and the other long edge 692 of the long hole 6 are formed in a straight line.

That is, as shown in FIG. 28A, the long holes 6 are formed to be long in parallel. In addition, the ridge 611
Are formed only on one long edge portion 691. Then, as shown in FIG. 28B, the protruding ridges 611 are formed so as to protrude only on the other surface 22 b side of the substrate 2. In addition, as shown in FIG. 28C, the protruding strips 611 are formed as one protruding strip 611a and the other protruding strip 611b so as to protrude from the one surface 22a and the other surface 22b of the substrate 2, respectively. May be.

Belt mounting bracket A constructed as described above
In 1, the same effects as in the first embodiment can be obtained with respect to the configuration of the ridge 611, the one ridge 611a, and the other ridge 611b.

Next, a fifth embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. However, components common to those of the fourth embodiment shown in FIG. 28 are denoted by the same reference numerals, and description thereof will be simplified. The difference between the fifth embodiment and the fourth embodiment is that the ridge 611 has one long edge portion 691.
And two short edge portions 7 and 7.

That is, as shown in FIG. 29 (a), the protruding ridges 611 form one of the long edge portions 691 and 2 in the long hole 6.
It is formed so as to wind the two short edges 7,7. Then, as shown in FIG. 29B, the protruding ridges 611 are formed so as to protrude only on the other surface 22b side of the substrate 2. In addition, as shown in FIG. 29C, the protruding strips 611 are formed as one protruding strip 611a and the other protruding strip 611b so as to protrude from the one surface 22a and the other surface 22b of the substrate 2, respectively. May be.

The belt mounting bracket A configured as described above
In 1, the short edges 7, 7 can be reinforced by the ridge 611, one ridge 611 a and the other ridge 611 b. In addition, the same functions and effects as those of the fourth embodiment are provided.

Next, a sixth embodiment of the present invention will be described with reference to FIG.
0 will be described. However, components common to those of the fourth embodiment shown in FIG. 28 are denoted by the same reference numerals, and description thereof will be simplified. The difference between the sixth embodiment and the fourth embodiment is that the ridge 611 has one long edge portion 69.
1 is that it is formed at the other long edge 692 and two short edges 7, 7.

That is, the protruding ridges 611 are formed over the entire circumference of the long hole 6 as shown in FIG. Then, as shown in FIG. 30B, the protruding ridges 611 are formed so as to protrude only on the other surface 22 b side of the substrate 2. Note that this ridge 611 is the same as FIG.
As shown in (c), the one ridge 611a and the other ridge 611b may be formed to protrude from the one surface 22a and the other surface 22b of the substrate 2, respectively.

Belt mounting bracket A constructed as described above
In 1, the entire elongated hole 6 can be reinforced by the ridge 611, one ridge 611 a, and the other ridge 611 b. In addition, the same operation and effect as those of the fourth and fifth embodiments are provided.

Next, a method of manufacturing a belt attachment according to a seventh embodiment of the present invention will be described with reference to FIGS. The belt mounting bracket A1 to be manufactured is shown in FIG.
32 are configured as shown in FIGS.
The configuration is almost the same as that of the first embodiment shown in FIG. 7 and that of the third embodiment shown in FIG. Therefore, the same reference numerals are given to the same components as those in the first and third embodiments, and the description will be simplified.

The belt mounting bracket A1 is manufactured by a set of press machines which automatically and continuously performs the operations of the respective steps shown in FIGS.

First, a steel sheet S wound into a coil shape as a material of the substrate 2 is sequentially fed into a press machine while being corrected into a planar shape.

Then, first, the piercing step P1 (FIG. 33)
), The pilot hole S1 of the long hole 6 is punched out of the steel plate S, and the positioning hole H1 is punched out. At this time, FIG.
As shown in (a), burrs (shear edge portions) S1a are generated on one surface Sa side of the steel sheet S by punching the prepared hole S1.

Next, the surface pressing step P2 (see FIG. 33)
Then, the burrs S1a generated in the piercing step P1 are pressed and removed by surface pressing. As a result, FIG.
As shown in (2), a beautiful state without burrs S1a is obtained.

Then, the next burring step P3 (FIG. 3)
3), a punch larger than the prepared hole S1 is pushed into the prepared hole S1 to form the elongated hole 6, and a part of the steel sheet S is protruded along the elongated hole 6 to form the ridge 611.
Is molded. As a result, as shown in FIG.
A ridge 611 protruding from the other surface Sb of the steel plate S is formed. However, the ridge 611 in this state is in a state where a corner is left.

Next, a curved surface forming step P4 (see FIG. 34)
Then, the ridges 611 formed in the burring step P3 are pressed against the surface to form rounded corners. As a result, FIG.
As shown in (d), the corners of the ridge 611 are rounded.

Next, in the restoring process P5 (see FIG. 34), the edge 6 of the long hole 6 on the side opposite to the ridge 611.
a (see FIG. 37 (e)) is pressed to form the same edge 6a into a curved surface having a larger radius of curvature. That is, FIG.
It is formed as shown in FIG.

Next, in a cut marking step P6 (see FIG. 34), the periphery of the portion that needs to be bent is cut, and a mark S10 is formed at a predetermined position.

Next, a C-surface pushing step P7 (see FIG. 35)
Then, the corners of the portions cut in the above-described cut marking step P6 are obliquely surface pressed to form the C chamfer 2b.

Next, a venting step P8 (see FIG. 35)
Then, the part that needs to be bent and formed in the above-described cut marking step P6 is bent with respect to the other steel sheet S parts.
Thereby, the bent part 2a is formed in the steel plate S.

Next, a piercing step P9 (see FIG. 35)
Then, a bolt hole 3 is punched in the steel plate S.

Next, in a separating step P10 (see FIG. 36), the sheet is cut so as to be continuous with the portion cut in the above-described cutting and engraving step P6, and cut off as a belt mounting bracket A1 having a predetermined shape. That is, the belt mounting bracket A1 shown in FIGS. 31 and 32 is completed.

The belt mounting bracket A1 constructed as described above
In the manufacturing method of (1), since the burrs generated in the piercing step P1 are removed in the face pressing step P2, the ridges 611 can be neatly protruded in the burring step P3, and in the curved surface forming step P4, Article 61
1 can be formed into a beautifully curved surface. Further, by the restriking process P5, the edge 6a of the long hole 6 on the side opposite to the ridge 611 can be smoothly and roundly formed with a larger radius of curvature. Accordingly, the corners of the long hole 6 can be rounded only by the press machine, so that the finishing (barrel polishing) is performed in a separate step.
Or the need for coating. Therefore, cost can be reduced. In addition, after each of the steps of the press machine including the cutting and stamping step P6, the C-face pressing step P7, the venting step P8, the piercing step P9, and the separating step P10 after the restriking step P5, the belt mounting bracket A1 as a single unit Are completed automatically and continuously. Therefore, the belt mounting bracket A1 can be manufactured continuously and efficiently.

The ridge 611 is formed by burring.
Since a part of the steel sheet S is protruded, it can be greatly projected from the substrate 2. Then, as shown in FIG. 32, the protrusion amount H of the ridge 611 is equal to the plate thickness T of the substrate 2.
It can be formed at 5% to 60%. Therefore, the contact area between the belt and the mounting bracket can be increased, and the surface pressure applied to the belt can be reduced.

In addition to the burring step P3, by performing the method of FIGS. 12 to 14 shown in the third embodiment, one surface 22a and the other surface
One ridge 611a and the other ridge 611b protruding from 2b can be formed. In this case, the protrusion amount H of each of the protrusions 611a and 611b can be formed to be 15% to 60% of the thickness T of the substrate 2 as shown in FIG. Also, in the manufacturing method according to the third embodiment, the protrusion amount H of each of the ridges 611, 611a,
Is 15% to 6% of the plate thickness T of the substrate 2 as shown in FIG.
It can be formed to 0%.

Further, the belt mounting brackets A1, A2 shown in the fourth, fifth, and sixth embodiments.
Can also be manufactured by employing the manufacturing method of the seventh embodiment or a method obtained by adding the method of FIGS. 12 to 14 to this manufacturing method. Also in this case, each ridge 61
1, 611a and 611b, the protrusion amount H is the thickness T of the substrate 2.
15% to 60%.

As described above, the projecting amount H of the ridge is set to 15% to 60% of the board thickness T of the substrate, because the expected effect is obtained when the projecting amount H is less than 15% of the board thickness T. When the protrusion amount H exceeds 60% of the plate thickness T, not only the cost of forming the ridges is greatly increased, but also cracks may be generated in the ridges during the molding. Because there is no.
The protrusion amount H is preferably 20% to 50% of the plate thickness T.

[0075]

According to the first aspect of the present invention, a portion of the plate is bent from one surface of the plate to the other to form a ridge protruding from the other surface. As a result, the ridge can be made to protrude greatly from the other surface, and a part of the plate-like body is moved to the other surface side after the shear edge (burr) generated by punching is removed by surface pressing. Because it is bent, the ridge can be projected out neatly. Therefore, it is possible to increase the area where one of the long edges hits the belt. That is,
The surface pressure acting on the belt from one long edge can be sufficiently reduced. Therefore, it is possible to improve the durability of the belt and the strength of the belt mounting bracket, and to improve the safety with the improvement of the durability and the strength.

Further, a shear edge portion generated in the piercing step
(Burr) is removed in the face-pressing process.
In the grinding process, the ridge can be projected out neatly
In the curved surface forming process, the convex corners are curved
It can be molded neatly into a shape .

In the invention according to claim 2, the elongated hole
The rising edge on the opposite side of the raised ridge is smoothly rounded
Step to the opposite side of the elongated hole from the ridge.
The edges should be smoothly rounded with a larger radius of curvature.
Can be. For this reason, a series of molding belt mounting brackets
In the pressing process, the corners can be rounded,
No need for finishing or coating in a separate process
Become. Therefore, cost can be reduced .

[Brief description of the drawings]

FIG. 1 is a front view of a belt mounting bracket shown as a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the belt mounting bracket taken along the line II-II in FIG. 1;

FIG. 3 is a diagram showing the belt mounting bracket, and is an enlarged view of a part III in FIG. 2;

FIG. 4 is a diagram showing the belt mounting bracket, and is a cross-sectional view taken along line IV-IV in FIG. 1;

FIG. 5 is an explanatory view showing a use state of the belt mounting bracket in an automobile.

FIG. 6 is a sectional view of a belt mounting bracket shown as a second embodiment of the present invention.

FIG. 7 is a perspective view of a belt mounting bracket shown as a third embodiment of the present invention.

FIG. 8 is an explanatory view showing a first manufacturing process when manufacturing the belt mounting bracket.

FIG. 9 is an explanatory view showing a second manufacturing process when manufacturing the belt mounting member.

FIG. 10 is an explanatory view showing a third manufacturing process when manufacturing the belt mounting bracket.

FIG. 11 is an explanatory diagram showing a fourth manufacturing process when manufacturing the belt mounting member.

FIG. 12 is an explanatory view showing a fifth manufacturing process when manufacturing the belt mounting bracket.

FIG. 13 is an explanatory view showing a sixth manufacturing process when manufacturing the belt mounting member.

FIG. 14 is an explanatory diagram showing a seventh manufacturing process when manufacturing the belt mounting member.

FIG. 15 is an explanatory diagram showing an eighth manufacturing process when manufacturing the belt mounting member.

FIG. 16 is a diagram showing the belt mounting bracket, and is an explanatory diagram showing a shape after an eighth manufacturing process.

FIG. 17 is an explanatory view showing a ninth manufacturing step when manufacturing the belt mounting bracket.

FIG. 18 is a view showing the belt mounting member, and is an explanatory view showing a shape after a ninth manufacturing step.

FIG. 19 is an explanatory diagram showing a tenth manufacturing step when manufacturing the belt mounting member.

FIG. 20 is a view showing the same belt mounting member,
It is explanatory drawing which shows the shape after the manufacturing process.

FIG. 21 is an explanatory diagram showing an eleventh manufacturing process when manufacturing the belt mounting member.

FIG. 22 is a view showing the belt mounting bracket, and is an eleventh embodiment.
It is explanatory drawing which shows the shape after the manufacturing process.

FIG. 23 is an explanatory view showing a fifth manufacturing process when manufacturing the belt mounting bracket shown as another example of the third embodiment.

FIG. 24 is an explanatory view showing a sixth manufacturing step when manufacturing the belt mounting member.

FIG. 25 is an explanatory view showing a seventh manufacturing step when manufacturing the belt mounting member.

FIG. 26 is a front view of a belt mounting bracket shown as another example of the first, second, and third embodiments.

FIG. 27 is a front view of a belt mounting bracket shown as another example of the first, second, and third embodiments.

FIGS. 28A and 28B are views of a belt mounting bracket shown as a fourth embodiment of the present invention, wherein FIG. 28A is a front view, FIG. 28B is a cross-sectional view, and FIG. 28C is another example of FIG. FIG.

FIGS. 29A and 29B are views of a belt mounting bracket shown as a fifth embodiment of the present invention, where FIG. 29A is a front view, FIG. 29B is a cross-sectional view, and FIG. 29C is another example of FIG. FIG.

FIGS. 30A and 30B are views of a belt mounting bracket shown as a sixth embodiment of the present invention, wherein FIG. 30A is a front view, FIG. 30B is a sectional view, and FIG. 30C is another example of FIG. FIG.

FIG. 31 is a perspective view of a belt mounting bracket manufactured by the manufacturing method shown as the seventh embodiment of the present invention.

FIG. 32 is a sectional view of a belt mounting bracket manufactured by the same manufacturing method.

FIG. 33 is a plan view of a steel plate showing respective steps from a piercing step P1 to a burring step P3 in the same manufacturing method.

FIG. 34 is a plan view of the steel sheet, showing respective steps from a curved surface forming step P4 to a cut marking step P6 in the same manufacturing method.

FIG. 35 is a plan view of a steel plate showing respective steps from a C-plane pushing step P7 to a piercing step P9 in the same manufacturing method.

FIG. 36 is a plan view of a steel plate showing a separating step P10 in the same manufacturing method.

FIG. 37 is a view showing a cross section of the steel sheet in the same manufacturing method, where (a) is a cross-sectional view of the steel sheet in a piercing step P1;
(B) is a cross-sectional view of the steel sheet in the face pressing process P2, (c).
FIG. 7 is a cross-sectional view of the steel sheet in the burring step P3, (d) is a cross-sectional view of the steel sheet in the curved surface forming step P4, and (e) is a cross-sectional view of the steel sheet in the restriking step P5.

FIG. 38 is a front view of a belt mounting bracket shown as a conventional example.

FIG. 39 is a cross-sectional view of the belt mounting member.

[Explanation of symbols]

 2 plate-like body (substrate) 22a one surface 22b the other surface 6 long hole 7 short edge 61 inner surface 611 ridge 611a one ridge 611b the other ridge 691 one long edge 692 the other long edge 13 Belt (waist belt) 151 Belt (connection belt) A1 Belt mounting bracket A2 Belt mounting bracket

Claims (2)

(57) [Claims] 1. A method of manufacturing a belt mounting bracket for a seat belt device formed by a plate-like body, wherein the plate-like body has an elongated hole into which a belt is inserted, and an edge of the elongated hole. A method of manufacturing a belt mounting bracket for a seat belt device having a ridge protruding from one of the one surface and the other surface of the plate-like body; A piercing step of punching a pilot hole, and a face pushing step of removing a shearing edge portion generated by the piercing step by face pushing; and pushing a punch larger than the pilot hole into the pilot hole,
A burring step of forming a long hole and projecting a part of the plate-like body along the long hole to form a ridge, and a surface pressure of the ridge formed in the burring step to form a plate-like body
Forming a ridge having a constant height from the surface of the belt, and a curved surface forming step of forming a tip of the ridge having the constant height into a smooth curved surface. Metal fitting manufacturing method. 2. A method of manufacturing a belt mounting bracket for a seat belt device formed of a plate-like body, wherein the plate-like body has an elongated hole into which a belt is inserted, and an edge of the elongated hole. A method of manufacturing a belt mounting bracket for a seat belt device having a ridge protruding from one of the one surface and the other surface of the plate-like body; A piercing step of punching a pilot hole, and a face pushing step of removing a shearing edge portion generated by the piercing step by face pushing; and pushing a punch larger than the pilot hole into the pilot hole,
A burring step of forming a long hole and projecting a part of the plate-like body along the long hole to form a ridge, and a surface pressure of the ridge formed in the burring step to form a plate-like body
Forming a ridge of constant height from the surface of the surface, a curved surface forming step of forming the tip of the ridge of the constant height into a smooth curved surface, the rising edge of the long hole on the side opposite to the ridge. and as factories you smoothly rounded molding method for manufacturing a seat belt apparatus belt mounting bracket, characterized in that it comprises a separate step for disconnecting the predetermined shape of the belt mounting bracket.