JPH0735143B2 - Guide member and manufacturing method thereof - Google Patents

Description

Description: [Object of the invention] (Industrial field of application) [0001] The present invention relates to a long guide member provided with an opening groove whose cross-sectional shape is substantially constant along the longitudinal direction, and a manufacturing method thereof. .

(Prior Art) As a long guide member in which opening grooves are formed in series in the longitudinal direction, there is, for example, a seat belt guide of a passive seat belt for an automobile. A passive seatbelt is a seatbelt that automatically operates to keep the occupant restrained as soon as the occupant sits on the seat and closes the door. In this case, one end of the seatbelt is inside the seat (on the console box side). Fixed to the other end, and the other end is shown in FIGS.
The seat belt guide 1 provided on the periphery of the window frame as shown in the figure is slid in the front-rear direction.

The seat belt guide 1 is an extruded material made of aluminum alloy, and has a concave cross-sectional shape having an opening groove 5 so that the cable 3 to which the other end of the seat belt is attached can slide along the longitudinal direction. There is. The opening groove 5 has a first protrusion 7 and a second protrusion 9 formed in series in the longitudinal direction, and the cable 3 is interposed between the first protrusion 7 and the bottom surface 11 via an anchor bracket 13. A cable holder 15 for holding the anchor bracket is provided between the first protrusion 7 and the second protrusion 9.
Guide shoes 17 through which 13 penetrates and are fixed to the anchor bracket 13 are slidably housed in the opening grooves 5. Then, the end portion of the seat belt is fixed to the anchor bracket 13, and the seat belt moves as the cable 3 slides. The cable 3 slides by a motor (not shown).

Such a seat belt guide 1 is bent so as to have curvatures of R ₁ , R ₂ , R ₃ , R ₄ , and R _{5 in} a two-dimensional direction as shown in FIG. Then, it is necessary to bend so as to have a curvature of R ₆ as shown in Fig. 5 according to the curved shape of the vehicle body.

For bending such a long work, for example, a bending apparatus as shown in FIG. 8 is used. The bending apparatus shown here includes a feeding device 19 having two pairs of feeding rollers 17,
A support device 25 provided with upper and lower support rollers 21 and left and right support rollers 23 that are located in front of the delivery device 19 in the delivery direction and serve as bending support points for the work W; The bending device 31 includes a vertical bending roller 27 and a horizontal bending roller 29, which are points of action.
In the bending device 31, the inner frame 31a to which the upper and lower and left and right bending rollers 27 and 29 are attached is a horizontal axis with respect to the outer frame 31b.
It swings up and down around 33, and the outer frame 31b swings left and right around the vertical axis 37 with respect to the machine body 35, whereby the work W is three-dimensionally bent along the axis.

At this time, the upper and lower and right and left bending rollers 27, 29 of the bending device 31
On the other hand, the upper and lower and left and right support rollers 21 and 23 are used as bending support points to perform bending work. However, since the work W has the opening groove 5 as described above, the flanges on both sides thereof are formed. There is a risk that 1a and 1b will fall toward the opening groove 5 side and be deformed. In order to prevent this, at the time of this bending process, a metal bending die 39 is attached near the bending supporting point of the supporting device 25, and the inside of the opening groove 5 of the work W is slidably contacted with the metal bending die 39. Is going.

The bending die 39 is made of tool steel or the like and is hardened by quenching to improve wear resistance. As shown in FIGS. 9 and 10, the bending die 39 conforms to the sectional shape of the opening groove 5 of the work W. It has a cross-sectional shape and has a slight gap t with the inner surface of the opening groove 5 when both the bottom surface and the side surface are inserted. Then, for example, when the work W is bent upward, the vertical bending roller 27 of the bending device 31 serves as a bending action point, while the vertical support roller 21 of the supporting device 25 serves as a bending support point. The upper and lower support rollers 21 are strongly pressed against the lower surface of the work W and the upper surface on the side of the opening groove 5.

(Problems to be Solved by the Invention) At this time, the inner bottom surface 11 of the opening W of the work W is strongly pressed against the bending fulcrum 41a near the tip of the lower surface 41 of the bending die 39 as shown in FIGS. 11 and 12. Therefore, the bottom surface 11 of the work W made of a relatively soft aluminum alloy is scraped off by the hard bending die 39 like so-called cutting work, and the scrap A is gradually accumulated.

The accumulated scrap A not only damages the inner bottom surface 11 of the opening groove 5 by the movement of the work W, but also when the bending curvature of the work W changes from a small one to a larger one as the work is delivered, that is, when the work W is bent. When the vertical bending roller 27, which is the point of action, moves downward and the work W approaches a state closer to a straight line, the pressure contact force of the bottom surface 11 with respect to the bending die 39 is weakened, so that as shown in FIG. The bending process will end with the particles adhered together.

In this way, the inner surface of the opening groove 5 of the work W is scratched,
If shavings are locally collected and adhered,
As a result of locally increasing the sliding resistance of the sliding member such as the cable, the cable or the like may be damaged or the seat belt may not be able to be smoothly extended.

Also, during bending, tensile stress is generated on the outside in the radial direction of the bending portion, especially in the bending portion having a small curvature such as the curvature R ₂ or R ₄ in FIG. 4, and bending as shown in FIG. The width of the machined portion in the bending radius direction narrows from the position of the two-dot chain line to the position of the solid line.
It becomes larger than the decrease amount Y on the inner side. As a result, the thickness of the bottom surface 11 side located at the outer side portion in the bending process becomes slightly thinner than the thickness t before the bending process. With this, the first
The dimension D between the protrusion 7 and the bottom surface 11 and the dimension E between the first protrusion 7 and the second protrusion 9 are reduced, respectively, and the overall width H in the bending radius direction is also reduced. As a result, the inside dimension of the opening groove 5 at the bent portion is determined by the curvatures R ₁ , R ₃ , R ₅ having large bending curvatures.
It is smaller than the bent part and straight part. As a result,
Not only is the inside dimension of the opening groove not uniform along the longitudinal direction, the sliding resistance of the sliding member such as the cable that slides in the opening groove increases at the above-mentioned bent portion, and the seat belt cannot be rolled out smoothly. However, generation of abnormal noise and increase in driving force are involved.

Then, this invention aims at providing the guide member which does not increase the sliding resistance of the member which slides in an opening groove, and its manufacturing method.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention relates to a long work having an opening groove having a substantially constant cross-section along the longitudinal direction. In a guide member that is bent in a state where a bending die made of a material harder than a work is inserted into the opening groove, a plurality of continuous ridges are formed along the longitudinal direction on the inner surface of the opening groove, The gist of the strip is that when the work is bent, it is crushed by the pressure contact of the bending die, which almost cancels out the decrease in the internal dimension of the opening groove due to the tensile stress generated outside the bending radius during bending. There is.

Another aspect of the present invention is a long work having an opening groove having a substantially constant cross-sectional shape along the longitudinal direction, and a plurality of continuous ridges continuously formed along the longitudinal direction on the inner surface of the opening groove. Extruded in a straight line, cut the extruded work into a predetermined length, insert a bending die made of a material harder than the work into the opening groove of the cut work, and the ridge becomes a bending die. Bending is performed in pressure contact, and the ridges are crushed into a bending die to substantially offset the decrease in the internal dimension of the opening groove due to the tensile stress generated outside the bending radius during bending. There is.

(Operation) The height of the ridge is reduced by the crushing of the ridge that is pressed against the bending die during bending, and the decrease in the internal dimension of the opening groove due to the tensile stress generated outside the bending radius during bending is almost eliminated. Offset. As a result, the internal dimension of the opening groove is
It is kept almost uniform along the longitudinal direction regardless of the bent portion.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view corresponding to FIG. 6 of the seat belt guide of the passive seat belt for an automobile shown in FIG. In the seat belt guide 43, a plurality of ridges 45a are formed in series along the longitudinal direction on almost the entire inner surface of the opening groove 45. The seatbelt guide 43, in particular, the ridge 45a of the portion bent by the small curvatures R ₂ and R ₄ shown in FIG. As shown in FIG. 9, by bending upward, it is pressed against the vertical bending roller 21 and near the bending fulcrum 41a of the bending die 39, the bottom 47 of the opening groove 45 and the second protrusion 51 side of the first protrusion 49. Bend die 39 on surface 49a of
Squeeze while sliding. As a result, the height of the protrusion 45a decreases from the height d of the straight portion of the seat belt guide 43 shown in FIG. 2 to the height d ₁ of the bent portion shown in FIG. The ridge 45a in the bent portion is plastically deformed by being crushed, so that the generation of shavings and the accumulation thereof as in the cutting process are prevented. For this reason, the sliding resistance of the cable holder and the guide shoe that slide in the opening groove 45 does not increase, the seat belt is smoothly fed out, and abnormal noise and driving force are prevented from increasing. It

On the other hand, during such bending, tensile stress is generated in the outer portion of the bending radius to reduce the wall thickness t, and the left and right flanges 43a and 43b are also stretched and the first projection 49 is formed. The dimension between the bottom 47 and the dimension between the first protrusion 49 and the second protrusion 51 is reduced. The decrease in this dimension is almost offset by the increase in the dimension due to the decrease in the height of the protrusion 45a generated by the crushing of the protrusion 45a described above, and the first protrusion 49 and the bottom portion 47 are separated from each other. As for the dimension between them, the dimension D of the straight portion of the entire length of the seat belt guide 43 shown in FIG. 2 and the dimension D _{1 of the} bent portion shown in FIG.
And are almost equal. The same applies to the dimension between the first protrusion 49 and the second protrusion 51. As a result, the dimensions in the opening groove 5 are kept substantially uniform over the entire length of the seat belt guide 43, the sliding resistance of the cable holder and the guide shoe sliding in the opening groove 5 is reduced, and the seat belt is extended. Is smooth, and generation of abnormal noise and increase in driving force are prevented.

Such a seat belt guide is manufactured as follows.

First, a long linear work made of an aluminum alloy is manufactured by extrusion molding so that the opening groove 5 and the protrusion 45a on the inner surface of the opening groove 5 are formed. Since aluminum alloys are softer and rich in ductility than steels, the linear shape is preferable because the cross-sectional shape can be formed within a relatively small tolerance.

The linear long work obtained by the extrusion molding is cut into a desired length, and the work is put into a bending apparatus.
In the bending apparatus, when the work W is sent to the support device 25 by the sending device 19, the bending die 39 is inserted into the opening groove 5 and is further sent to the bending device 31 in this state.

Here, when the upper and lower bending roller 27 to a smaller subjected to bending with a curvature as in the fourth curvature of view R _2, R ₄ is moved upward around the horizontal shaft 37, the action point bending vertical bending roller 27 On the other hand, the upper and lower support rollers 21 serve as bending support points and are subjected to desired bending. At this time, the work W is the upper and lower support rollers.
While being clamped and pressed against 21, the vicinity of the tip of the lower surface 41 of the bending die 39 serves as a bending fulcrum 41a, and the bending die 39 is the bottom 47 of the opening groove 45 of the workpiece W and the second protrusion 51 side of the first protrusion 49. Face 49
It is strongly pressed against a, and the ridge 45a at this portion is crushed so as to be plastically processed as the work W moves.

As a result, as described above, the decrease in the inner dimension of the opening groove 45 due to the tensile stress on the outside of the bending radius generated during bending is
The protrusion 45a is crushed to be offset by the increase in the same dimension, and the dimension in the opening groove 45 is kept substantially uniform along the longitudinal direction.

Although the seat belt guide of the passive seat belt according to the present invention has been described in the above embodiment, the present invention is not limited to this, for example, a guide rail of a window glass that moves up and down in a car, or a one-box type car. It may be applied to a guide rail of a door or the like that slides in the vehicle front-back direction. In short, the present invention can be applied to any long-length guide member in which an opening groove is formed along the longitudinal direction and another member slides in the opening groove.

Further, in the above-described embodiment, the one having the bent portion with a small curvature in the vertical direction has been described, but the same action and effect can be obtained also for the guide member having the same bent portion in the lateral direction.

[Effects of the Invention] As described above, according to the present invention, a plurality of ridges are formed in series on the inner surface of the opening groove along the longitudinal direction, and the ridges are pressed into a bending die and plastically worked. On the other hand, during the above bending process, the inside dimension of the opening groove is reduced by the tensile stress at the bending radius outside portion, but this reduction is due to the ridge being crushed and the height of the ridge being reduced. This is offset by the increase in the same dimension, so the dimension inside the opening groove is kept substantially uniform along the longitudinal direction, and the sliding resistance of the member that slides inside the opening groove does not increase and is kept stable. . In addition, since the ridge is crushed as if it is plastically processed, there is no possibility that the inside of the opening groove will be scraped off due to sliding while being pressed into contact with the bending die, and shavings will not be generated. Sliding resistance is suppressed.

[Brief description of drawings]

1 is a sectional view of a seat belt guide showing an embodiment of the present invention, FIG. 2 is a sectional view of an essential part of a portion having a large bending curvature, and FIG. 3 is a sectional view of an essential part of a portion having a small bending curvature. FIG. 4 is a side view of a conventional seat belt guide, FIG. 5 is a view taken in the direction of arrow V in FIG. 4, FIG. 6 is an enlarged sectional view taken along line VI-VI in FIG. 4, and FIG. FIG. 8 is a sectional view showing a state where the sliding member is housed in the seat belt guide shown in FIG. 8, FIG. 8 is a side sectional view of the bending apparatus, and FIG. 9 is an enlarged explanatory view at a bending support point of FIG. FIG. 10 is a right side view of FIG. 9, FIG. 11 and FIG. 13 are explanatory views showing a bending process in a conventional example, and FIG. 14 is an explanatory diagram showing a dimensional reduction in the bending process portion. 39 …… Bending die 43 …… Seat belt guide (guide member) 45 …… Opening groove, 45a …… Ridge

Claims (2)

[Claims] 1. A bending work is performed on a long work in which an opening groove having a substantially constant cross-sectional shape is formed along a longitudinal direction in a state where a bending die made of a material harder than the work is inserted into the opening groove. In the applied guide member, a plurality of continuous ridges are formed on the inner surface of the opening groove along the longitudinal direction, and the ridges are crushed by press-fitting of a bending die during bending of the work to bend the ridge. A guide member, which substantially cancels out a decrease in internal dimension of an opening groove due to a tensile stress generated outside a bending radius during processing. 2. A long work which has an opening groove whose cross-sectional shape is substantially constant along the longitudinal direction and in which a plurality of continuous ridges are continuously formed along the longitudinal direction on the inner surface of the opening groove. -Shaped extrusion molding, cutting the extruded work into a predetermined length, inserting a bending die made of a material harder than the work into the opening groove of the cut work, and pressing the ridge to the bending die Bending is performed as described above, and the ridge is crushed by the bending die, thereby substantially canceling out the decrease in the inside dimension of the opening groove due to the tensile stress generated outside the bending radius during bending. Method for manufacturing guide member.