JP6824753B2 - Hollow molded product - Google Patents

Description

The present invention relates to a hollow molded product. More specifically, the present invention relates to a hollow molded product formed by blow molding of a resin.

Conventionally, a hollow molded product formed by blow molding of a resin is known (see, for example, Patent Document 1).

The hollow molded product in Patent Document 1 is a defroster duct. The defroster duct is integrally formed of a main body portion and a plurality of mounting portions (convex portions) provided at the front end of the main body portion. The mounting portion projects forward along the surface direction of the upper surface of the main body portion, and is formed in a rectangular shape in a plan view.

Japanese Unexamined Patent Publication No. 2014-108580

Here, when the defroster duct is molded by blow molding, a portion containing burrs is molded in the mounting portion in order to integrally mold, for example, the mounting portion protruding from the peripheral edge portion of the main body portion, and then the mounting portion is molded. A worker or the like cuts the burr part with a cutter.

However, when cutting burrs on the peripheral edge of the mounting part with a cutter, after advancing the cutter in the left-right direction along the front end of the main body, change the direction of the cutter by 90 ° (right angle) at the base of the mounting part and move forward. Then, change the direction of the cutter by 90 ° at the front end corner of the mounting part and advance it in the left-right direction along the front end of the mounting part, and change the direction of the cutter by 90 ° at the front end corner of the mounting part and move backward. Finally, the direction of the cutter is changed by 90 ° at the base of the mounting portion, and the cutter is advanced along the front end of the main body portion.

In this way, when cutting off burrs from the peripheral edge of the mounting part with a cutter, it is necessary to move the cutter two-dimensionally so that it goes straight and turns left and right, so deburring of the peripheral edge of the mounting part can be done quickly with high accuracy. There was the problem that it was difficult to do.

In order to solve the above-mentioned problems, the present invention provides a hollow molded product having improved manufacturing efficiency of the hollow molded product having a convex portion.

In order to solve the above-mentioned problems, the hollow molded product according to the present invention includes a bottom surface arranged on the lower side and an upper surface arranged on the upper side, and the end portions of the surfaces are joined to form a hollow portion inward. Yes and a body portion formed in closed cross sectional structure, provided in the end portion of the upper surface of the body portion, and a protrusion protruding upward is a direction intersecting a surface direction of the upper surface of the main body portion, The end surface of the end portion of the main body portion and the end surface of the convex portion are formed linearly in a plan view.

The end face of the main body portion and the end face of the convex portion in the hollow molded product are formed linearly in a plan view. Therefore, the cutting work is performed by moving the cutter linearly from the end portion of the main body portion to the end portion of the convex portion in a plan view, and the work of cutting the burr of the convex portion to form the end face becomes efficient. Therefore, the production efficiency of the hollow molded product made of resin having a convex portion is improved.

It is a top view of the defroster duct, the ventilation duct and the stelling hanger beam which concerns on 1st Embodiment of this invention. It is a perspective view which looked at the ventilation duct and the stelling hanger beam in FIG. 1 from an oblique rear view. It is a perspective view which looked at the ventilation duct of FIG. 2 from an oblique rear view. It is a perspective view which looked at the convex part of FIG. 3 from an oblique rear view. It is a perspective view which shows the state after taking out the ventilation duct which concerns on 1st Embodiment from a mold. It is a perspective view which shows the state which the burr is excised along the cut line from the state of FIG. It is a side view which shows the state which the burr is excised along the cut line from the state of FIG. It is a perspective view which shows the convex part which concerns on another embodiment of this invention. It is a perspective view which shows the convex part which concerns on still another Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, an instrument panel (not shown) is arranged in the front part of the vehicle interior of the automobile. Inside this instrument panel, a defroster duct 1, a ventilation duct 3 (hollow molded product), and a stelling hanger beam 5 showing only a part thereof for explanation extend along the left-right direction (vehicle width direction). Exists.

The defroster duct 1 supplies air-conditioning air that removes fogging inside the windshield and the side window glass in the immediate vicinity of the side mirror (not shown) from the defroster opening at the front end of the upper surface of the instrument panel. The ventilation duct 3 (hollow molded product) is integrally blow-molded with the defroster duct 1 and a resin such as polypropylene, and air-conditioned air blown from the vertical surface of the instrument panel into the vehicle interior is supplied. The stelling hanger beam 5 is manufactured by a method of forming by press molding, welding, casting or the like using a metal such as iron or magnesium, or by an injection molding of a polyamide resin to which glass fiber is added. Further, the stelling hanger beam 5 has a first locking projection 7 as described later, and the stelling hanger beam 5 is locked by the first locking projection 7 on the convex portion 33 of the ventilation duct 3. And the ventilation duct 3 are combined.

Specifically, as shown in FIG. 2, the front portion of the stelling hanger beam 5 is provided with a first locking projection 7 and a second locking projection 9 projecting forward. The first locking projection 7 extends upward from the front portion of the stelling hanger beam 5, and is provided with a bifurcated claw portion at the upper end portion. That is, the bifurcated claw portion 13 is formed by forming the notch portion 15 at the central portion in the left-right direction at the upper end portion. The convex portion 33 of the ventilation duct 3 is fitted into the notch portion 15 of the bifurcated claw portion 13. Further, the second locking projection 9 holds the front surface of the ventilation duct 3. These first locking projections 7 and second locking projections 9 hold the front side and the rear side of the ventilation duct 3 so as to sandwich them from the front and back. A pair of left and right ribs 11 and 11 are formed on the rear surface of the first locking projection 7 along the vertical direction.

As shown in FIGS. 3 and 4, the ventilation duct 3 is configured to have a convex portion 33 on the main body portion 20.

A hollow portion 30 is formed inside the main body portion 20 by a first resin member 21 arranged on the rear side and a second resin member 23 arranged on the front side. Specifically, by sandwiching the parison, which is a cylinder of molten resin, with a mold during blow molding, a part of the facing surfaces of the parison is linearly abutted and bonded, and air is blown into the inside. The main body portion 20 having the hollow portion 30 formed therein is formed. Specifically, the back surface 25 arranged on the rear side, the bottom surface 27 arranged on the lower side, the front surface 31 arranged on the front side, and the upper surface 29 arranged on the upper side are formed in a closed cross-sectional structure. ing. Then, the upper end portion of the back surface 25 of the first resin member 21 and the front end portion of the upper surface 29 of the second resin member 23 are joined in a state of being abutted during the blow molding, so that the flange extends diagonally upward. 22 is formed.

The convex portion 33 projects upward in a direction intersecting the surface direction of the upper surface 29 of the main body portion 20. The convex portion 33 is a pair of vertical wall surfaces 43 extending upward in a direction intersecting the surface direction of the upper surface 29 of the main body portion 20 and arranged apart from each other in the left-right direction, and a pair of vertical wall surfaces 43. It is composed of an upper bottom surface 41 that connects the upper ends to each other in the left-right direction. The end faces 53 and 55 of the vertical wall surface 43 and the upper bottom surface 41 are formed in a U shape when viewed from the front. The thickness T2 of the vertical wall surface 43 is thinner than the thickness T1 of the main body 20. As shown in FIGS. 1, 3 and 4, the end faces 51 of the main body 20 and the end faces 53 and 55 of the convex 33 are formed linearly in a plan view.

Next, a procedure for cutting the burr 61 of the flange 22 in the intermediate product 103 taken out from the mold after the blow molding is completed will be described.

As shown in FIG. 5, the cut line CL of the alternate long and short dash line, which is a virtual line, is set along the longitudinal direction of the flange 22 (the left-right direction in the vehicle-mounted state). As shown in FIGS. 6 and 7, the burr 61 can be cut by linearly moving the cutter 63 along the cut line CL along the direction of the arrow C.

First, when the cutter 63 is linearly moved along the cut line CL of the flange 22 of the main body portion 20, a portion other than the convex portion 33 other than the flange 22 can be cut off. Since the convex portion 33 projects upward so as to intersect the surface direction of the upper surface 29 of the main body portion 20, the cut line CL of the convex portion 33 and the cut line CL of the flange 22 of the main body portion 20 are viewed in a plan view. It is set in a straight line. Therefore, when cutting the burr 61 of the convex portion 33, the burr 61 is continued to move without changing the direction of the cutter 63, as in the case of cutting the burr 61 of the flange 22 of the main body portion 20. Can be excised.

The effects of this embodiment will be described below.

[Aspect 1] The ventilation duct 3 (hollow molded product) according to the present embodiment is provided at a main body portion 20 having a hollow portion 30 inward and an end portion of the main body portion 20, and is provided in a plane direction of the main body portion 20. It is provided with a convex portion 33 protruding in a direction intersecting with the above. The end face 51 of the main body 20 and the end faces 53 and 55 of the convex portion 33 are formed linearly in a plan view.

As described above, the end surface 51 of the main body portion 20 and the end surfaces 53 and 55 of the convex portion 33 in the ventilation duct 3 are formed linearly in a plan view. That is, when looking down from the UPR direction in FIG. 3, the end faces 51, 53, and 55 are in a straight line. Therefore, the burr 61 of the convex portion 33 is cut off and the end surface is cut by the cutting operation of moving the cutter 63 linearly in a plan view along the flange 22 formed from the end portion of the main body portion 20 to the end portion of the convex portion 33. 51, 53, 55 can be formed. Therefore, the production efficiency of the resin hollow molded product having the convex portion 33 is improved.

That is, in the conventional hollow molded product, the convex portion 33 protrudes from the end portion of the main body portion 20 in a plan view. Therefore, when cutting the burr 61 at the end portion of the convex portion 33, the cutter 63 is two-dimensionally cut. I had to move it straight and turn left and right.

However, in the present embodiment, it is not necessary to make the cutter 63 go straight and turn left / right two-dimensionally, and the cutter 63 may be moved linearly in a plan view, so that the deburring work becomes very easy.

[Aspect 2] Since the end faces 53 and 55 of the convex portion 33 are formed in a U shape in a front view, the cross-sectional area cut by the cutter 63 is larger than that of the solid convex portion 233 (see FIG. 9). It becomes smaller. Therefore, the difference in the resistance force that the cutter 63 receives when cutting the burr 61 between the main body portion 20 and the convex portion 33 is smaller in the U-shaped convex portion 33 than in the solid convex portion 233. Therefore, the cutter 63 can be smoothly moved from the end of the main body 20 to the end of the convex portion 33.

[Aspect 3] The convex portion 33 has a pair of vertical wall surfaces 43 extending in a direction intersecting the surface direction of the main body portion 20 and arranged apart from each other, and the tips of the vertical wall surfaces 43. It is composed of an upper bottom surface 41 to be connected, and the thickness T2 of the vertical wall surface 43 is thinner than the thickness T1 of the main body portion 20.

Therefore, the difference in the resistance force received by the cutter 63 when the burr 61 is cut between the main body portion 20 and the convex portion 33 becomes smaller. Therefore, the cutter 63 can be moved more smoothly from the end of the main body 20 to the end of the convex portion 33.

[Aspect 4] Further, the method of cutting the burr 61 of the ventilation duct 3 (hollow molded product) according to the present embodiment is a method of cutting the burr 61 integrally formed at the end of the resin ventilation duct 3. is there. The ventilation duct 3 includes a main body portion 20 having a hollow portion 30 inward, and a convex portion 33 provided at an end portion of the main body portion 20 and projecting in a direction intersecting the plane direction of the main body portion 20. The cut line CL set at the end of the portion 20 and the cut line CL set at the end of the convex portion 33 are formed linearly in a plan view. Along the cut line CL, the cutter 63 is linearly moved from the flange 22 of the main body 20 to the end of the convex portion 33 in a plan view, and burrs on the ends of the flange 22 of the main body 20 and the convex portion 33. By excising 61, the end faces 53 and 55 of the convex portion 33 are formed flush with the end face 51 of the main body portion 20.

Therefore, the burr 61 of the convex portion 33 can be cut by the cutting operation of moving the cutter 63 linearly from the flange 22 of the main body portion 20 to the flange 22 of the convex portion 33 in a plan view. The production efficiency of the hollow molded product to have is improved.

That is, in the present embodiment, the cut line CL set at the end of the main body 20 and the cut line CL set at the end of the convex portion 33 are formed linearly in a plan view. Therefore, it is not necessary to make the cutter 63 go straight and turn left / right two-dimensionally, and the cutter 63 may be moved linearly in a plan view, so that the deburring work becomes very easy.

[Aspect 5] The method for cutting a burr 61 of a ventilation duct 3 (hollow molded product) according to [Aspect 4], wherein the end portion of the convex portion 33 is formed in a U shape in a front view. ..

As described above, since the end portion of the convex portion 33 is formed in a U shape when viewed from the front, the convex portions 33 and 233 to be cut by the cutter 63 are compared with the solid convex portion 233 (see FIG. 9). The cross-sectional areas are significantly different. Therefore, the difference in the resistance force that the cutter 63 receives when cutting the burr 61 between the main body portion 20 and the convex portion 33 is smaller in the U-shaped convex portion 33 than in the solid convex portion 233. Therefore, the cutter 63 can be smoothly moved from the end of the main body 20 to the end of the convex portion 33.

[Aspect 6] The method of cutting a burr 61 of a ventilation duct 3 (hollow molded product) according to [Aspect 5], wherein the end portion of the convex portion 33 intersects the surface direction of the main body portion 20. The thickness T2 of the vertical wall surface 43 is composed of a pair of vertical wall surfaces 43 extending in the direction of the vertical wall surface and arranged apart from each other, and an upper bottom surface 41 connecting the tips of the vertical wall surface 43 to each other. , It is thinner than the thickness T1 of the main body 20.

As described above, since the thickness T2 of the vertical wall surface 43 is thinner than the thickness T1 of the main body portion 20, the difference in the resistance force received by the cutter 63 when the burr 61 is cut between the main body portion 20 and the convex portion 33 is further increased. It becomes smaller. Therefore, the cutter 63 can be moved more smoothly from the end of the main body 20 to the end of the convex portion 33.

The present invention is not limited to the above-described embodiment, and various modifications and modifications can be made based on the technical idea of the present invention.

For example, as shown in FIG. 8, the thickness T3 of the vertical wall surface 153, 157 of the convex portion 133 may be set to be equal to the thickness T1 of the upper surface 29 of the main body portion 20. Since the thickness T3 of the vertical wall surface 153 and 157 of the convex portion 133 is thicker than the thickness T2 of the vertical wall surface 43 of the convex portion 33, the strength of the convex portion 133 is higher than that of the convex portion 33.

Further, as shown in FIG. 9, the shape of the convex portion 233 may be formed in a rectangular plane shape instead of a U shape. In this case, the height (thickness) of the convex portion 233 is set to T4, and this thickness T4 is larger than the thickness T1. The height (thickness) T4 of the convex portion 233 is the same as the height of the convex portion 33 and the convex portion 133.

3 Ventilation duct (hollow molded product)
20 Main body 30 Hollow part 33, 133, 233 Convex part 41 Upper bottom surface 43 Vertical wall surface 51, 53, 55 End face

Claims (2)

And a top surface disposed arranged bottom and upper on the lower side, a main body portion formed in closed cross an end of a surface is to have a hollow portion inwardly are joined, the body portion A convex portion provided at the end portion on the upper surface side and projecting upward in a direction intersecting the surface direction of the upper surface portion of the main body portion is provided.
A hollow molded product characterized in that the end surface of the end portion of the main body portion and the end surface of the convex portion are formed linearly in a plan view. The hollow molded product according to claim 1.
The convex portion connects a pair of vertical wall surfaces extending upward in a direction intersecting the surface direction of the upper surface of the main body portion and arranged apart from each other, and the tips of these vertical wall surfaces. Consists of top and bottom,
A hollow molded product characterized in that the end surface of the convex portion is formed in a U shape when viewed from the front.

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