JP2001080432A - Molding method of vehicular mounting member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce cost in molding a vehicular mounting member while utilizing a blow molding method, by increasing the number of molding per a unit time, reducing the material cost by the avoidance of a material loss and making easy an after machining. SOLUTION: A pair of right/left vehicular installation members 10, 10 which are a final product are at first faced the inside wall part 21 to be contacted to the right/left side surface of a car body each other and also oneside vehicular installation member 10 is faced vertically and reversely against the other vehicular installation member 10 and blow-molded to an intermediate molded body W joined under the state shifted by a prescribed amount to an oblique side. Then, by cutting and separating an obtained intermediate molded part W by the joined part 13 of a pair of vehicular installation members 10, 10, the independent respective vehicular installation members 10, 10 are obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding a vehicle mounting member, and more particularly, to blow molding of a vehicle mounting member such as a rocker panel or a side mud guard mounted on an outer surface of a vehicle body of a passenger car. The present invention relates to a molding technique which can be manufactured efficiently.

[0002]

2. Description of the Related Art In some passenger cars, as shown in FIG. 11, rocker panels 40, 41 are provided at lower portions of outer side surfaces of left and right front doors 36 and rear doors 37 and lower edges of left and right side surfaces of a vehicle body 35. There are vehicle types to which a vehicle mounting member such as the side mudguard 42 is attached. The rocker panels 40 and 41 and the side mudguards 42
Has a protection function of protecting the lower part of the side surface of the vehicle body 35 and each of the doors 36 and 37 from pebbles and the like jumped up by the tire 39 of the vehicle during traveling, and a decoration function of dressing up the vehicle body 35. I have. The rocker panels 40 and 41 and the side mud guards 42 are made of a material such as a synthetic resin, and are mainly formed by an injection molding method, a vacuum molding method, a compression molding method, or the like. In any of the molding methods, cost increase is a major problem because the cost of manufacturing a mold is high.

In recent years, attempts have been made to form the rocker panels 40 and 41 and the side mud guards 42 by a blow molding method capable of keeping the cost of forming a mold low. In this blow molding method, as is well known, a parison softened by heating is hung down and sandwiched between two split molds, and air is forcibly blown into the parison to expand the parison, so that the inside of the split mold is formed. It is intended to produce a blow molded product having an outer contour matching the cavity to be defined, and is particularly suitable for molding a hollow lightweight molded product. However, when molding the vehicle-mounted members such as the rocker panels 40 and 41 and the side mud guards 42 by blow molding, the molding cycle time is long, the material becomes hollow, so the material cost increases, and after sanding, etc. When processing is required, problems such as an increase in the number of molding steps are pointed out, which hinders practical use.

For example, FIG. 12A is a cross-sectional view showing a state in which a rocker panel 40 for a rear door 37 is blow-molded by a conventional molding method, and FIG. 12B is a perspective view of the rocker panel 40 molded by this molding method. It is. The rocker panel 40 is blow-molded in a cavity 47 of a blow mold 45 composed of split molds 46, 46, and is exposed to the outside to serve as a design surface.
And a hollow body having a wide and thin space 26 between the walls 20, 21. However, the inner wall portion 21
Since this is a part that is completely covered and is not exposed to the outside when mounted on the rear door 37, the central part 21a excluding the attachment part 23 becomes a substantially useless part, and the above-described problem is inherent. It has become. Further, since only one cavity 47 is defined in the blow mold 45, only one rocker panel 40 can be molded in one blow molding process, and the number of molded parts per unit time is limited. The problem is also inherent.

[0005]

Therefore, in order to solve the above problem, as shown in FIG. 13 (a), a blow mold 50 composed of divided molds 51, 51 is connected to two cavities 52, 53. A method of simultaneously forming a pair of left and right rocker panels 40, 40 in the respective cavities 52, 53 has been proposed. According to this molding method, the number that can be molded per unit time is simply doubled, so that there is an advantage that the above problem can be solved and the cost can be reduced. However, both molded rocker panels 40,
Since 40 is formed into a hollow body, any of the panels 40, 4
0, the inner wall portion 21 is formed, and the above-mentioned problem has not been solved yet. FIG.
As shown in (b), burrs 54 are easily formed on the parting line PL of each of the split dies 51, 51.
A post-process for removing the γ is further added. Moreover, the burr 5
Since the formation position of 4 is a portion which is exposed to the outside when the rocker panel 40 is mounted on the rear door 37, it is necessary to carefully and carefully perform the removal operation, which is more costly than the injection molding method or the vacuum molding method. It will be up.

As shown in FIGS. 14 (a) and 14 (b), the parting line P.L of each of the split dies 56, 56 in the blow mold 55 is simultaneously solved to solve the above problems. After integrally forming the pair of right and left rocker panels 40 in a state where they are joined with each other, FIG.
As shown in (1), there has been proposed a method in which the respective rocker panels 40, 40 are simultaneously formed by cutting along the joint portion 43. According to this molding method, since the inner wall portion 21 is not formed on each of the rocker panels 40, 40, there is an advantage that cost reduction can be achieved by increasing the number of moldings per unit time and reducing material costs. However, since the mounting portion 23 is not formed, the mounting to the rear door 37 is hindered.
Since the cut end face 44 is separated from the edges of the panels 40 and 40 when the cut end face is separated, if the cut end face 44 is not carefully and carefully finished, a gap is formed when the cut end face 44 is mounted on the rear door 37. Etc. were inherent problems.

[0007]

SUMMARY OF THE INVENTION The present invention has been proposed to suitably solve the above-mentioned problems. In molding a vehicle mounting member by using a blow molding method, the number of moldings per unit time is increased, and material loss is increased. It is an object of the present invention to provide a method of forming a vehicle mounting member, which can reduce costs by reducing material costs and facilitating post-processing by avoiding problems.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to achieve the intended object, a method of forming a vehicle mounting member according to the present invention comprises a pair of right and left sides attached to left and right side surfaces of a vehicle body such as a passenger car. A blow molding method for obtaining a vehicle mounting member of the pair, a pair of left and right vehicle mounting members that will be a final product,
The inner wall portions to be brought into contact with the left and right side surfaces of the vehicle body face each other, and one of the vehicle mounting members is turned upside down with respect to the other vehicle mounting member, and is displaced obliquely laterally by a required amount. The intermediate molded bodies joined in the separated state are blow-molded, and the obtained intermediate molded bodies are cut and separated at the joining portions of the pair of vehicle mounting members, thereby obtaining independent vehicle mounting members. It is characterized by the following.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a method for forming a vehicle mounting member according to the present invention will be described below with reference to the accompanying drawings by way of preferred embodiments. Therefore, in this embodiment, a rear rocker panel mounted on the lower portion of the outer side surface of the rear door 37 will be exemplified as a vehicle mounting member, and a case where this rocker panel is formed by a blow molding method will be described. In the description of the related art, the same members and portions as those already described will be denoted by the same reference numerals.

FIG. 1 is a perspective view and a sectional view taken along line II of an intermediate molded product blow-molded by the molding method according to the present embodiment. FIG. 2 is a plan view of the intermediate molded product shown in FIG. FIG.
FIG. 3 is a side view of the intermediate molded product shown in FIG. The intermediate molded product W blow-molded by the molding method of the present embodiment is formed by integrally joining a pair of right and left rocker panels 10, 10 for the rear door 37 having a symmetrical shape to each other. It has a hollow body shape. That is, as shown in FIG. 4, for example, as shown in FIG. 4, the parison (not shown) softened by heating is hung down and pressed between the two split molds 31, 31 in the blow mold 30. By forcing air into the air to inflate it,
Cavities 32 defined inside the split dies 31, 31
It is formed into a shape that conforms to.

The intermediate molded product W will be described in more detail. When the rocker panels 10 are mounted on the rear door 37, the inner wall portions 21 to be brought into contact with the outer side surface of the door 37 face each other. At the same time, one of the rocker panels 10 is turned upside down by 180 degrees with respect to the other rocker panel 10 and is displaced obliquely laterally by a required amount.
0 is integrally formed. That is, each locker panel 1
Reference numerals 0 and 10 deviate upward and rearward with respect to the other opposing panel, and are connected to each other by a rectangular frame-shaped joining portion 13. In addition, a tool guide groove 14 along the joint portion 13 is recessed outside the joint portion 13 during molding. Therefore, the cavity 32 of the blow mold 30 is provided with each rocker panel 1.
0 and 10 are defined in the same shape as the outer shape in the state described above.

Further, since both rocker panels 10, 10 are integrally formed in the above-described state, each panel 10, 10,
On the inner wall portion 21 in FIG. 10, a mounting portion 23 in which a fixing bolt 24 for mounting and fixing to the rear door 37 is set in a protruding state is formed so as to extend substantially in an L shape from an upper edge to a rear edge. . As shown in FIG. 4, these fixing bolts 24 are set in advance on the split molds 31 in the blow mold 30 before the intermediate mold W is blow-molded. At the time of molding, it is fixedly attached to the attaching portion 23 by a so-called insert blow molding method.

Each of the rocker panels 10 and 10 integrally formed by blow molding is separated from each other by cutting in a later step using a required cutting tool (for example, a cutter or the like) not shown. That is, by making a cut along the tool guide groove 14 with a cutting tool,
As shown in FIGS. 5 and 6, the left and right rocker panels 1
0,10 are separated from each other. As described above, both rocker panels 1 formed by cutting and separating the intermediate molded product W are formed.
0, 10 is an outer wall portion 20 which is exposed to the outside and becomes a design surface.
And an inner wall portion 21 that is in close contact with the outer side surface of the rear door 37, and an opening 22 having the joint portion 13 as an outline is formed in the inner wall portion 21. The opening 22 is formed integrally with the rocker panels 10, 10 in a deviated state, so that the inner wall 21.
Is formed adjacent to the lower edge and the front edge, so that the attachment portion 23 extends in a substantially L shape from the upper edge portion 19a along the rear edge portion 19b.

Each rocker panel 1 thus formed
0, 10 are left and right rear doors 37, as shown in FIG.
At the time of attachment to the lower portion of the outer surface of the rear door 37, the fixing bolt 24 is inserted through a bolt insertion hole 38 formed in each of the rear doors 37, 37, and the nut 25 is fastened from the rear side to be fixed to the rear door 37. The lower edge 19c side of the rocker panels 10, 10 is connected to the rear door 37,
37 is attached to the lower corner.

As shown in FIG. 10, each of the rocker panels 10, 10 formed by the molding method of this embodiment can be visually recognized from the outside of the vehicle body 35 when mounted on the rear door 37. Since the cut end 15 formed by cutting the joint portion 13 does not reach the edge 19a and the rear edge 19b which can be visually recognized when the door 37 is opened and closed, the appearance is impaired. And there is no loss of texture. Moreover, the cut end 15
Is coated, there is no problem even if a small amount of burrs or irregularities are formed on the cut end portion 15.
Ten cutting and separating operations can be easily performed. Further, in each of the rocker panels 10 and 10, an attachment portion 23 for fixing and fixing a fixing bolt 24 for mounting to the door 37 is formed on the inner side wall portion 21 which is covered when the rocker panel 10 is mounted to the rear door 37. Since the opening 22 is formed in a region other than the attachment portion 23, a large opening is defined, so that the cost can be reduced by drastically reducing the material cost. In addition, since two rocker panels 10, 10 consisting of a pair of left and right sides can be molded simultaneously in one blow molding process, the number of molded pieces per unit time increases, and a cost reduction effect can be expected.

FIG. 8 shows a pair of left and right rocker panels 11, 1 mounted on the outer side surfaces of the left and right front doors 36.
1 shows a case where blow molding is performed by the molding method according to the present embodiment. That is, the inner wall portions 21 to be brought into contact with the outer side surface of the door 36 when they are mounted on the front door 36 face each other, and one of the rocker panels 11 rotates 180 degrees with respect to the other rocker panel 11. It is displaced upside down, and is deviated to the oblique side by a required amount.
An intermediate molded article W in which 1, 1 are integrally connected is molded. Then, as shown in FIG. 8B, by making a cut along the tool guide groove 14 with a cutting tool, the right and left rocker panels 11, 11 are formed separately from each other.

As described above, each of the rocker panels 11, 11 blow-molded by the molding method of this embodiment has an upper edge which can be visually recognized directly from above when attached to the outer side surface of the front door 36. Part 19a and the front door 36
Since the cut end 15 formed by cutting the joint portion 13 does not reach the trailing edge portion 19b that can be visually recognized when the camera is opened, the appearance is not impaired and the texture can be reduced. Absent. Each locker panel 11,
11 has an opening 22 defined in the inner wall 21,
Cost reduction can be achieved by reducing material costs.
Also, two rocker panels 1 in one blow molding process.
Since 1 and 11 can be molded at the same time, the number of moldings per unit time increases, and a cost reduction effect can be expected.

FIG. 9 shows a pair of left and right side mudguards 1 mounted on the lower side of the left and right sides of the vehicle body 35.
2 and 12 illustrate the case where blow molding is performed by the molding method according to the present embodiment. That is, the inner wall portions 21 to be brought into contact with the outer side surface of the vehicle body 35 when mounted on the vehicle body 35 face each other,
One side mud guard 12 is turned upside down by 180 degrees with respect to the other side mud guard 12,
And, it is deviated by a required amount diagonally to the side, and in this state, an intermediate molded product W in which the two 12, 12 are integrally connected is molded. Then, as shown in FIG. 9B, by making a cut along the tool guide groove 14 with a cutting tool, the left and right side mudguards 12, 12 are formed separately from each other.

When the side mudguards 12, 12 blow-molded by the molding method of this embodiment are attached to the lower side of the vehicle body 35, as shown in FIG. The upper edge portion 19a which can be directly viewed from above when the rear door 36 or the rear door 37 is opened.
In addition, since the cut end 15 formed by cutting the joint portion 13 does not reach, the appearance is not deteriorated and the texture is not deteriorated. Further, in each of the side mud guards 12, 12, the opening 22 is defined in the inner wall portion 21, so that the cost can be reduced by reducing the material cost. Further, since the two side mud guards 12, 12 can be molded simultaneously in one blow molding step, the number of molded parts per unit time increases, and a cost reduction effect can be expected.

In the above embodiment, the rocker panels 10, 1
The fixing bolt 24 has been exemplified as a means for fixing the first and side mud guards 12 to the doors 37, 36 or the vehicle body 35, but other than this, for example, a locking hole formed at a predetermined position of each door 37, 36 or the vehicle body 35 may be used. On the other hand, an engaging member or the like which is irremovably engaged may be employed.

The vehicle mounting members covered by the present application are not limited to the rocker panels and the side mudguards. For example, side protection moldings and the like mounted on the doors 36 and 37 and the outer surface of the vehicle body 35 are also covered. Then, these vehicle mounting members can also be suitably molded by the molding method of the present embodiment.

[0022]

As described above, according to the method of molding a vehicle mounting member according to the present invention, a pair of left and right vehicle mounting members can be blow-molded simultaneously in one blow molding step, so There is an advantage that the cost can be reduced by increasing the number of moldings. Further, in the molding method of the present invention, an attachment portion is formed on the inner wall portion to be brought into contact with the vehicle body, and a large opening is defined in a region other than the attachment portion. This has the effect that cost can be reduced by a significant reduction in the cost. Furthermore, since the cut end formed when cutting both the vehicle mounting members integrally blow-molded is formed at a position where it does not reach the outside when it is attached to the outer side surface of the vehicle body, the texture is reduced. Since there is no problem, and there is no problem even if some burrs or irregularities are formed on the cut end, there is an advantage that the cutting and separating work can be easily and easily performed.

[Brief description of the drawings]

FIG. 1 shows a pair of left and right rocker panels for a rear door as an intermediate molded product obtained by a molding method according to the present invention, wherein (a) is a perspective view showing the intermediate molded product,
(b) is a sectional view taken along line II of (a).

FIG. 2 is a plan view of an intermediate molded product forming a pair of right and left rocker panels shown in FIG.

FIG. 3 is a side view of an intermediate molded product forming a pair of right and left rocker panels shown in FIG.

FIG. 4 is an explanatory sectional view when blow molding the intermediate molded product of FIG. 1A using a split mold.

FIG. 5 is a perspective view showing a state in which a pair of right and left rocker panels in FIG.

6 is a side sectional view of left and right rocker panels separated in the step of FIG. 5;

FIG. 7 is a side sectional view in a state where each of the right and left rocker panels is mounted on the corresponding door outer surface.

FIG. 8 shows a pair of left and right rocker panels for a front door as an intermediate molded product obtained by the molding method according to the present invention, wherein (a) is a perspective view of the intermediate molded product,
(b) is a sectional view taken along line VIII-VIII of (a).

FIG. 9 shows a pair of left and right side mudguards as an intermediate molded product obtained by the molding method according to the present invention, wherein (a) is a perspective view of the intermediate molded product, and (b) is (a). IX
FIG. 9 is a sectional view taken along line IX.

FIG. 10 is a perspective view of a main part of a vehicle to which a rocker panel and a side mud guard formed by the molding method according to the present invention are mounted, respectively, with a rear door opened.

FIG. 11 is an explanatory view showing a rocker panel or a side mud guard as a vehicle mounting member mounted on an outer surface of a vehicle body.

12A is a cross-sectional view showing a state in which a rocker panel is formed by a blow molding method according to a conventional technique, and FIG. 12B is a perspective view of the rocker panel formed by the molding method.

13A is a cross-sectional view showing a state where left and right rocker panels are simultaneously formed by another blow molding method according to the related art, and FIG. 13B is a perspective view of each rocker panel formed by this molding method. is there.

FIG. 14A is a cross-sectional view showing a state in which left and right rocker panels are simultaneously formed by another blow molding method according to the related art, and FIG. 14B is a perspective view of each rocker panel formed by this molding method. It is.

FIG. 15 is a perspective view showing a state in which the left and right rocker panels shown in FIG. 14B are separated at the joining portions to be separated into the left and right rocker panels.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Rocker panel (vehicle mounting member) 13 Joining part 14 Tool guide groove 15 Cutting end 21 Inner wall part 23 Attachment part 24 Fixing bolt (fixing means) 37 Rear door (vehicle body) W Intermediate molded product

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Fumito Tominaga 8-1, Tocho, Fujii-cho, Anjo-shi, Aichi Prefecture Inoac Corporation Sakurai Office (72) Inventor Yasushi Nomura 8-1, Higashi-cho, Fujii-cho, Anjo, Aichi Prefecture Inoac Corporation Sakurai Office (72) Inventor Noriaki Hidaka 4630 Shimotakanezawa Oga, Haga-cho, Haga-gun, Tochigi F-term in Honda Access Tochigi R & D Laboratories (reference) 3D023 AA01 AA03 AB01 AC22 AD04 AD22 4F208 AG07 AH18 LB01 LG01 LW02 LW23

Claims (5)

[Claims] 1. A blow molding method for obtaining a pair of left and right vehicle mounting members (10, 10) attached to the right and left side surfaces of a vehicle body (37) such as a passenger car, the method comprising: Vehicle mounting members (10,10)
Are inner wall portions to be brought into contact with the left and right side surfaces of the vehicle body (37).
(21) are facing each other, and one vehicle mounting member (10) is joined to the other vehicle mounting member (10) in a state where the vehicle mounting member (10) is turned upside down and biased by a required amount diagonally to the side. The intermediate molded body (W) is blow molded, and the obtained intermediate molded body (W) is molded into the pair of vehicle mounting members (10, 1).
A method for forming a vehicle mounting member, characterized in that each of the vehicle mounting members (10, 10) is obtained by cutting and separating at a joining portion (13) of (0). 2. An attachment portion (23) to be brought into contact with an outer side surface of the vehicle body (37) is formed along an outer edge portion of the inner wall portion (21), and cutting of the joining portion (13). The method for molding a vehicle mounting member according to claim 1, wherein the cut end portion (15) serving as a scheduled portion is formed along an inner edge portion of the attachment portion (23). 3. A tool guide groove (1) along said joining portion (13).
4) forming each vehicle mounting member (10) with the required cutting tool
3. The method for forming a vehicle mounting member according to claim 1, wherein the cutting and separating operation of the vehicle is facilitated. 4. A fixing means (24) for mounting and fixing said vehicle mounting member (10) to said vehicle body (37) when blow molding said vehicle mounting member (10), said mounting portion (23). The method for molding a vehicle-mounted member according to any one of claims 1 to 3, wherein the vehicle-mounted member is mounted on the vehicle at the same time. 5. The vehicle mounting according to claim 1, wherein the vehicle mounting member is a rocker panel mounted on an outer surface of a door forming a part of the vehicle body. The method of forming the member.