JP2000052892A - Peripheral edge member such as weatherstrip, core metal therefor, and manufacture of core metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent breaking unevenness generated at the time of cutting off a core piece by a parting machine by rolling a connection part of a metal sheet after slit formation, longitudinally from both upper and lower faces by rollers so as to enlarge slits. SOLUTION: Cross direction slits are formed near both cross direction side parts of a metal sheet, at specified spaces in the longitudinal direction, leaving a connection part. The metal sheet after slit formation is rolled by first stage upper and lower rollers 7a, 7b formed in protruding shape only on one side, in correspondence with the connection part to form a rolled groove part of strip shape on the upper face, and further rolled by second stage upper and lower rollers 8a, 8b formed in protruding shape only on the opposite side to the first stage rollers 7a, 7b to form a rolled groove part of strip shape on the lower face. Through these processes, the rolled groove parts continuous in the longitudinal direction are formed on both upper and lower faces of the connection part so as to prevent breaking unevenness generated to a core piece when cut off by a parting machine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a peripheral member such as a weather strip for an automobile, a core metal thereof, and a method of manufacturing the core metal.

[0002]

2. Description of the Related Art A peripheral member of a weatherstrip or an opening trim (hereinafter referred to as a "weatherstrip") attached to a door of an automobile or a peripheral flange of an opening thereof maintains a shape retaining property of the flange mounting portion. In addition, a thin strip-shaped steel plate is buried and integrated with rubber or resin of a mounting portion having a U-shaped cross section as a core metal.

[0003] Conventionally, as a method of manufacturing this kind of cored bar,
A strip-shaped metal thin plate is sequentially fed to the press cutter portion, and slits in the width direction are formed at predetermined intervals in the longitudinal direction, leaving connection portions near both side portions in the width direction of the thin plate, and thereafter, one side of this connection portion Was rolled to expand the slits, and formed a continuous groove in the connecting portion in the longitudinal direction, and the connecting portion was thinned to obtain a metal core.

[0004] Thereafter, the core metal and rubber or resin are integrally extruded and formed by an extruder, and the extruded product is passed through the upper and lower rolls of a core piece cutting machine to divide the connecting portion into pieces. A peripheral member, such as a weather strip, in which a number of core pieces arranged at intervals by slits are embedded in the longitudinal direction, is bent into a U-shaped cross section by a plurality of rolls having a concave surface and a convex surface in a bending machine. It was formed so that a product having a U-shaped cross section could be obtained.

[0005]

By the way, in the above-mentioned method of manufacturing a cored bar, the connecting portion of the cored bar is formed by rolling only one surface to form a rolling groove. Warpage occurred in the width direction (see FIG. 6B). These warpages become obstacles when the core pieces are separated by the cutter, and irregularities in the braking (the core pieces do not fall apart) have occurred.

[0006]

The inventor of the present invention has conducted intensive studies on a peripheral member such as a weather strip, a cored bar, and a method of manufacturing the cored bar, which can eliminate the cause of the above-mentioned braking irregularity. By rolling the connecting portion of the metal sheet later from the upper and lower surfaces by rolling rolls and stretching in the longitudinal direction so as to expand the slit, it is possible to prevent warpage caused by one-sided rolling as in the past, and as a result, It has been found that even when an integrally extruded product of a core metal and rubber or resin is passed through a core piece cutting machine to separate the core pieces, breaking irregularity can be prevented, and the present invention has been completed.

[0007] The slit is formed in order to eliminate waste of material in place of the long hole formed by the punching method of a thin metal plate, but the slit width is expanded to the same width as the long hole. In order to do so, a method of rolling the connecting portions adjacent in the width direction of the slit in the longitudinal direction is adopted.
Therefore, only the connecting portion that determines the set width of the slit may be targeted as the rolling portion. In addition, even if the connecting portion differs depending on each core piece, it can be dealt with by setting the forming position of the pressing convex portion of the rolling roll.

However, in order to prevent the longitudinal displacement between the slit forming position and the rolling portion in the longitudinal direction, the connecting portion of each core piece is the same, and the core piece portion on the longitudinal extension of the connecting portion is also required. It is more preferable to perform rolling at the same time to form a rolling groove continuous in the longitudinal direction.

The position of the connecting portion in the width direction may be appropriately set in accordance with the bent shape of the weather strip. May be included).

As a method of rolling the upper and lower surfaces of the connecting portion, any of a method of simultaneously rolling the upper and lower surfaces and a method of separately rolling can be adopted. This is preferable in that it can prevent

In this case, the metal sheet after forming the slit is
Of the upper and lower rolling rolls, a rolling groove is formed on the upper surface of the connecting portion through upper and lower first rolling rolls having only one side (for example, the upper side) in a convex shape corresponding to the connecting portion. If a rolling groove is formed on the lower surface of the connecting portion through upper and lower second-stage rolling rolls in which only the rolling roll surface opposite to the rolling roll (for example, the lower side) has a convex shape, the warpage once generated by the first rolling roll is reduced. Then, it is returned to the original state by the bending stress from the opposite direction, and the warpage can be eliminated. In addition, since the rolling groove is formed on the upper and lower surfaces of the connecting part and it is thin,
Advantageously, the weakened connecting part can be completely separated by a core piece cutter.

[0012]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view of an apparatus for manufacturing a core metal such as a weather strip according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of a main part of a first-stage rolling roll, and FIG. FIG. 4 is an enlarged cross-sectional view of a main part, and FIG. 4 shows a form when a slit is formed in a metal thin plate.
(B) is its side view, (c) is its bottom view. FIG.
FIG. 6A is a front view of the connecting portion of the metal sheet when rolling, FIG. 6A is a side view showing an ideal form after the rolling of the metal sheet, and FIG.
Is a side view of the sheet metal after passing through the first-stage rolling roll, (c)
FIG. 4 is a side view of a thin metal plate after passing through a second-stage rolling roll.

As shown in the figure, the core metal 1 in the present embodiment has a cross section U in order to maintain the shape retention of the flange attachment portion in a weather strip or the like attached to an automobile door or an opening peripheral flange thereof. In this configuration, a large number of strip-shaped core pieces 2 are arranged in the longitudinal direction at predetermined intervals, as shown in FIG. Are connected to each other by the connecting portions 3 near both sides of the main body.

The method of manufacturing the core bar 1 is as shown in FIG.
The strip-shaped metal sheet 1a is sequentially fed into a press cutter (not shown), and slits 6 in the width direction are formed at predetermined intervals in the longitudinal direction while leaving the connecting portions 3 near both sides in the width direction of the metal sheet 1a. Process and metal sheet 1 after slit formation
a is rolled through upper and lower first-stage rolling rolls 7 a and 7 b having only one side (upper roll) in a convex shape corresponding to the connecting portion 3 to form a strip-shaped rolling groove 9 on the upper surface, and thereafter, A step of rolling through upper and lower second rolls 8a and 8b having only the opposite side (lower roll) to the first rolls 7a and 7b and having a convex shape to form a strip-shaped rolling groove 10 on the lower surface. The first and second rolling rolls 7a, 7b, 8a, 8b form continuous rolling grooves 9, 10 in the longitudinal direction on both upper and lower surfaces of the connecting portion 3.

The thin metal plate 1a of the present embodiment is made of a cold-rolled thin steel plate (SPCC) having a thickness of about 0.5 mm, and has a matte finish (dull finish). The slit 6 is formed in the entire width of the band-shaped thin metal plate 1a except for the connecting portion 3 near both sides.

As shown in FIG. 2, the first-stage rolling rolls 7a and 7b are composed of an upper roll 7a having a pressing projection 12 projecting to a portion corresponding to the connecting portion 3 of the roll peripheral surface, and a thin metal plate 1a. A concave portion 13 is formed on the peripheral surface as a passage for conveying, and a lower roll 7b on the lower side having a flat bottom portion 13a.
And the pressing projection 12 and the bottom 13a,
A position corresponding to the connecting portion 3 on the upper surface of the thin metal plate 1a is rolled to form a rolling groove 9 continuous in the longitudinal direction. By forming the rolling groove 9, as shown in FIG.
Since the metal sheet 1a is elongated in the longitudinal direction, the slit 6
Is a widened form.

The metal sheet 1a that has passed through the first-stage rolling rolls 7a and 7b is subjected to a bending stress from a direction perpendicular to the sheet surface by the pressing force of the pressing convex portion 12, so that FIG.
As shown in (b), a warp 14 in which the center and both ends in the width direction of the thin plate 1a protrude upward occurs. Rolled sheet 1
The ideal form of a is a flat (flat) form as shown in FIG. 6A, and if the warpage 14 is left, the connecting portion at the desired position cannot be completely cut by the core piece cutting machine. It may be exposed from the rubber or resin coating the cored bar.

Then, the metal sheet 1a after passing through the first-stage rolling rolls 7a and 7b is passed through the second-stage rolling rolls 8a and 8b. As shown in FIG. 3, the second-stage rolling rolls 8a and 8b have an upper upper roll 8a in which a concave portion 16 as a passage for transporting the metal sheet 1a is formed on the peripheral surface and a bottom 16a of which is a flat surface. The lower surface of the lower roll 8b has a pressing projection 17 projecting to a portion corresponding to the connecting portion 3 of the peripheral surface. The lower surface of the connecting portion 3 is rolled by the pressing projection 17 and the bottom 16a. Rolling groove 10 continuous in the longitudinal direction
Is formed.

When the rolling groove 10 is formed, the bending force in the reverse direction for returning the warp 14 of the metal sheet 1a in the direction perpendicular to the sheet surface of the metal sheet 1a due to the pressing force of the lower pressing projection 17 is generated. The metal sheet 1a (the metal core 1) that has passed through the second-stage rolling rolls 8a and 8b acts and eventually returns to a flat plate surface. At the same time, since the metal thin plate 1a is elongated in the longitudinal direction by the formation of the rolling groove 10, the slit 6 is further expanded, and the core pieces 2 are arranged in the longitudinal direction at a predetermined interval.

The groove depths of the rolling groove portions 9 and 10 are determined by the initial thickness of the metal sheet 1a, the slit width to be set (the interval between the core pieces 2), and when the core metal 1 is bent by the core piece cutting machine. The thickness is determined by the thickness at which the connecting portion 3 at the desired position can be divided. In the present embodiment, when the initial thickness of the thin metal plate 1a is 0.5 mm, the groove depth is set to 0.1 mm each. ing.

The metal core 1 after passing through the second-stage rolling roll is:
Rubber or resin is integrally extruded and formed by an extruder (not shown), and the extruded weather strip is passed between upper and lower rolls of a core piece cutter (not shown) to separate desired connecting portions. By dividing, a weather strip or the like in which a large number of core pieces 2 arranged at intervals by the slits 6 are buried in the longitudinal direction is obtained, and this has a concave surface and a convex surface in a bending machine (not shown). A product is obtained by bending and forming a U-shaped cross section with a plurality of rolls.

The weather strip 20 obtained by such a manufacturing method is connected at both ends 21 to each other as shown in FIGS.
A mounting portion 24 having a U-shaped cross section in which the metal core 1 is buried, and a hollow seal portion 26 integrally formed by extrusion on a head 25 of the mounting portion 24. A locking lip 27 for holding the body flange inside the U-shaped mounting portion 24, and a decorative lip 28 outside the outside are integrally formed.

[0023]

As is apparent from the above description, according to the present invention, since the portion corresponding to the connecting portion of the metal sheet is rolled from the upper and lower surfaces, the core metal can be prevented from warping. There is an excellent effect that the breaking irregularity can be prevented even when cutting off.

[Brief description of the drawings]

FIG. 1 is a schematic view of an apparatus for manufacturing a core metal such as a weather strip according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a first-stage rolling roll.

FIG. 3 is an enlarged sectional view of a second-stage rolling roll.

FIG. 4A is a front view when a slit is formed in a thin metal plate,
(B) is a side view thereof, and (c) is a bottom view thereof.

FIG. 5 is a front view of the connecting portion of the sheet metal when rolling.

6 (a) is a side view showing an ideal form of a sheet metal after rolling, FIG. 6 (b) is a side view of the sheet metal after passing through a first-stage rolling roll, and FIG. 6 (c) is a second step rolling of the sheet metal. Side view after passing through the roll

FIG. 7 is a side view of an automobile showing a mounting portion of a weather strip in which a metal core is buried in the present embodiment.

FIG. 8 is a perspective view of the weather strip.

9 is a sectional view taken along line AA of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core metal 1a Metal thin plate 2 Core piece 3 Connecting part 6 Slit 7a, 7b First-stage rolling roll 8a, 8b Second-stage rolling roll 9, 10 Rolling groove part 12, 17 Pressing convex part 20 Weather strip

Claims (5)

[Claims] 1. A widthwise slit is formed at a predetermined interval in a longitudinal direction while leaving a connecting portion in a strip-shaped metal sheet, and then the connecting portion is rolled to form a rolling groove, thereby expanding the slit. A method of manufacturing a core metal such as a weather strip which is formed by forming rolling grooves of the connecting portion on both upper and lower surfaces at the time of opening, and connecting a large number of core pieces by the connecting portion and continuing in the longitudinal direction. 2. The method of manufacturing a metal core according to claim 1, wherein the connecting portion is formed at the same position in the width direction of the metal sheet, and the rolling groove portion is continuous in the longitudinal direction. 3. The sheet metal after the slit formation is rolled through upper and lower first-stage rolling rolls having a convex shape on only one side corresponding to the connecting portion, and then further opposite to the first-stage rolling roll. The core according to claim 1 or 2, wherein rolling is performed through upper and lower second-stage rolling rolls having only a convex side, and rolling grooves are formed on both upper and lower surfaces of a connecting portion by the first and second-stage rolling rolls. Gold manufacturing method. 4. A plurality of core pieces are arranged in a longitudinal direction by forming slits in a band width direction at predetermined intervals in a longitudinal direction while leaving a connecting portion in a strip-shaped metal thin plate. And a core metal of a peripheral member such as a weather strip having a rolling groove portion formed on the lower surface thereof, which is continuous in the longitudinal direction. 5. A peripheral member such as a weather strip using the cored bar according to claim 4.