JP3788579B2 - Cowl cover mold and cowl cover - Google Patents

Description

[0001]
[Industrial technical field]
The present invention relates to a molding die for a cowl cover for an automobile and a cowl cover, and in particular, molding of a cowl cover for an automobile that does not cause burrs during molding in a plurality of glass sandwiching portions that sandwich the front edge of a windshield. The present invention relates to a metal mold and a cowl cover having a plurality of glass sandwiching portions without burrs.
[0002]
[Prior art]
Conventionally, a structure is known in which a cowl cover body disposed between a bonnet that covers an engine room and a windshield covers a cowl box that is a vehicle body panel provided between the engine room and the windshield. . This type of cowl structure takes outside air while preventing falling leaves, rainwater, snow and the like from entering the cowl box, and separates rainwater and the like into the cabin to introduce outside air.
[0003]
The cowl cover main body has a length substantially the same as the bonnet width, and is a thin plate-shaped exterior trim part having an arch shape. The cowl cover main body is provided with an opening having a mesh for preventing rainwater, snow and the like from entering, a hole for projecting the wiper drive shaft to the outside, and a recess for avoiding interference with the wiper arm. On the back side of the rear edge of the cowl cover body that faces the windshield, a plurality of hook pieces having a substantially L shape projecting intermittently across the width direction of the vehicle body are integrally formed. The hook piece and the rear end edge of the cowl cover main body improve the aesthetics by slightly sandwiching the front end edge of the windshield and closing the gap formed between the windshield and the cowl cover main body. Yes.
[0004]
The cowl cover body is usually formed by injection molding a polypropylene resin material colored black or the like. At the time of injection molding, a large mold is required, and the resin material required for one shot of molding is a small amount for the mold size. The hook piece of the cowl cover main body after molding cannot be pulled out straight in the pressing direction of the mold or the protruding direction of the molded product. Such a hook piece that becomes an undercut portion is molded by attaching a slide mold to a mold, for example, and then released when the molded product protrudes.
[0005]
An example of a method for manufacturing this type of conventional cowl cover body (a cowl louver body) is disclosed in, for example, Japanese Patent Application Laid-Open No. 6-305447. The cowl cover body manufacturing method disclosed in the publication includes an upper mold for molding the surface of the cowl cover body, a lower mold for molding from the back surface of the cowl cover body to the outer surface of the hook piece, and a rear end of the cowl cover body. Underfill formed at the rear edge when the molded cowl cover body protrudes, after the resin material is injected and filled into the cavity formed by the slide mold that molds the back of the edge and the inner surface of the hook piece. A hook piece (holding claw) which is a cut part is released by a slide type. The slide mold has a length exceeding the inner surface of the hook piece, and extends between the rear surface of the rear edge of the cowl cover main body and the inner surface of the hook piece. The joint surface is configured by a horizontal plane extending in the width direction from one side edge of the hook piece forming portion, and an inclined surface descending obliquely from the extended end of the horizontal plane.
[0006]
By providing this slide mold, even if a burr-like material is formed at the edge portion of one side edge in the width direction of the hook piece due to the resin material entering the joint surface between the slide mold and the upper mold, The burrs do not extend in the thickness direction of the cowl cover body or in the direction toward the front edge of the windshield. As a result, when the cowl cover body is attached to the windshield, there is no fear that the tip of the burr-like material at the edge portion of the hook piece contacts the windshield surface and damages the windshield surface. Therefore, there is an advantage that the windshield is not damaged even if the edge portion of the hook piece is not deburred.
[0007]
[Problems to be solved by the invention]
However, increasing the length of the slide mold causes an increase in the size of the slide mechanism. That is, the increase in the movement stroke of the slide mold has a problem that the mold itself is further enlarged. When the slide type drive mechanism is driven by hydraulic pressure to move the slide mold as the mold opens and closes, the hydraulic mechanism becomes larger and the amount of oil increases. There is a problem of doing. Further, the angular pin (inclined pin) that is fitted at a predetermined angle with respect to the moving direction of the mold to move the slide mold in accordance with the opening / closing of the mold leads to an increase in the opening / closing stroke of the mold.
[0008]
As described above, even if the drive mechanism is driven by hydraulic pressure or moved by an inclined pin, an increase in the operation leads to an increase in the molding cycle time, and therefore the work efficiency is greatly reduced and the productivity is extremely reduced. It becomes. In addition, as the mold becomes larger, the molding machine for adapting to the mold becomes larger. Therefore, as described above, the resin material required for one shot of molding is not necessary so much, but a large mold molding machine is required, which leads to an increase in equipment costs and manufacturing costs as a whole. There is also.
[0009]
Further, the cowl cover body has an arch shape along the curved windshield surface as described above, and a plurality of hook pieces projecting intermittently toward the back surface along the rear edge of the cowl cover body. Therefore, in a plurality of slide types having a large moving stroke, the movement of the slide type is greatly limited, and it is difficult to process the cowl cover main body side together with the slide type.
[0010]
Further, although the above-mentioned publication shows a mold cross section in the longitudinal direction, when viewed from the mold cross section in the width direction, a bonding surface of the mold is generated in the direction of the windshield. When a parting line (PL) is set at the rear end edge of the cowl cover main body corresponding to the joining surface of the mold, burr-like objects are formed along the windshield surface at the rear end edge of the cowl cover main body. Arise. When this burr-like material occurs, the rear edge of the cowl cover body and the windshield surface are rubbed due to vibrations when the vehicle is running, etc., and abnormal noise is likely to occur or the appearance design is deteriorated. Since a protector such as a rubber material is required, it is not preferable. When the protector is assembled, the burr-like object becomes an obstacle and deteriorates the mounting quality.
[0011]
The present invention has been made to solve the above-mentioned conventional problems, and its specific purpose is excellent in workability and prevents the occurrence of burrs in a plurality of glass sandwiching portions that sandwich the front edge of the windshield. Thus, a molding die for an automobile cowl cover that eliminates the need for deburring is provided, and further, a cowl cover having a plurality of glass sandwiching portions free from harmful burrs on the windshield surface is provided.
[0012]
[Means for solving the problems and effects]
The invention according to claim 1 has a hook piece that protrudes intermittently toward the back side along the rear edge of the cowl cover body, and the rear edge of the cowl cover body and the hook piece are used to A molding die for an automotive cowl cover having a plurality of glass sandwiching portions for sandwiching a front edge, wherein the mold portion for molding the glass sandwiching portion molds the surface of the cowl cover main body. 1 mold part, a second mold part molded from the back surface of the cowl cover body to the outer surface of the hook piece, and can be inserted and removed between these first and second mold parts, The back surface of the rear end edge of the cowl cover main body and a third mold part that molds the inner surface of the hook piece are provided, and the first and second mold parts are peripheral surfaces of the third mold part. first and some peripheral surface facing the insertion direction of removal there, this insertion A second partial peripheral surface that intersects the removal direction and faces the opening and closing direction of the first and second mold parts; and both the insertion and removal direction and the opening and closing direction of the first and second mold parts A cowl cover molding die having a third partial peripheral surface facing a third direction intersecting and a guide surface for direct guidance.
[0013]
According to the present invention, the first and second mold parts have guide surfaces that directly guide at least three partial peripheral surfaces that intersect each other on the peripheral surface of the third mold part. When the first to third mold parts are opened and closed, the third mold part is directly guided to the guide surfaces of the first and second mold parts. It is possible to insert and remove between the two mold parts.
[0014]
When these first mold part to third mold part are clamped, at least three partial circumferential surfaces of the third mold part intersecting with each other become guide surfaces of the first and second mold parts. Abutted. At least three partial peripheral surfaces of the third mold part are positioned by being sandwiched between the guide surfaces of the first and second mold parts, and are not deformed by the pressure of the injection resin.
[0015]
According to the present invention, a minute gap is not formed in the joint surface between the third mold part and the first and second mold parts, and the molten resin does not flow into the gap. Does not occur. Productivity can be improved without deteriorating the appearance by burr or requiring a finishing process to remove it. In addition, no abnormal noise is generated when the vehicle is running, and the appearance can be improved with good mounting accuracy and appearance.
[0016]
Furthermore, in the present invention, as described above, the first and second mold portions are guide surfaces that directly guide at least three partial circumferential surfaces that intersect with each other on the circumferential surface of the third mold portion. Therefore, it is possible to minimize the movement stroke of the plurality of third mold parts without increasing the length of the plurality of third mold parts or increasing the movement stroke as in the prior art. Therefore, the movement of the plurality of third mold parts is not restricted.
[0017]
In the invention according to claim 2, the three partial peripheral surfaces sandwich an opening molding surface between a rear end edge of the cowl cover main body and a holding end edge of the hook piece, and a bent portion of the hook piece. It is characterized by being part of two peripheral surfaces.
[0018]
The contact portions on the three partial circumferential surfaces of the third mold part are arranged in the same direction with respect to the mold opening / closing direction of the first and second mold parts. Since the clamping pressure acts directly on the third mold part, the position of the third mold part is accurately determined, and the bonding surface between the third mold part and the first and second mold parts is determined. No burr occurs. Since a contact surface for the third mold part can be formed inside the cavity for molding the hook piece, the bending deformation is suppressed compared to the case where the hook part is supported by the edge of the third mold part. Can be prevented.
[0019]
The invention according to claim 3 has a hook piece that protrudes intermittently toward the back side along the rear edge of the cowl cover body, and the front edge of the windshield has the rear edge of the cowl cover body and the hook piece. A cowl cover for an automobile having a plurality of glass sandwiching portions for sandwiching edges, wherein the hook piece is bent from a base piece straddling a front end edge of the windshield and a rear end edge of the base portion, Has a pressing piece that presses the back surface of the glass, and has a through hole in at least the base piece and the pressing piece.
[0020]
The automobile cowl cover of the present invention is effectively molded using the mold. A cowl cover having a hook shape without harmful burrs on the windshield surface is obtained. The through hole of the hook piece can suppress the displacement of the third mold part, and does not cause burrs in the hook piece. In addition, since the hook piece does not have a burr, a seal body can be easily attached to the opening holding portion between the hook piece and the windshield. The sealing body can be stably held without causing the rear edge and the windshield surface to rub and generate abnormal noise.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings.
FIG. 1 is a partial perspective view schematically showing a part of a vehicle body to which a cowl cover according to a typical embodiment of the present invention is attached, and FIG. 2 is a perspective view schematically showing the whole cowl cover. It is.
[0022]
In these drawings, a cowl cover 10, which is a typical embodiment of the present invention, is disposed between a hood 2 and a windshield 3 that cover an engine room 1 of an automobile, and between the engine room 1 and the windshield 3. The cowl box 4 provided in the cover is covered. Generally, the cowl cover 10 is formed by injection molding a polypropylene resin material containing talc.
[0023]
The cowl cover 10 includes an arch-shaped thin cowl cover main body 11 having substantially the same length as the bonnet 2, and a plurality of glass sandwiching portions 13,. It has. On the flat plate portion of the cowl cover body 11, there are an opening 11a covered with a resin mesh that prevents intrusion of rainwater, dead leaves, etc., a drive shaft hole 11b of the wiper, and a recess 11c that avoids interference with the wiper arm. Is provided.
[0024]
The features of the present invention lie in the structure of the mold 20 for forming the cowl cover body 11 and the structure of the glass sandwiching portion 13 of the cowl cover body 11. FIG. 3 shows a typical structure example of the glass sandwiching portion 13, and as is apparent in FIG. 3, the glass sandwiching portion 13 is protruded intermittently toward the back side along the rear end edge 12 of the cowl cover body 11. A hook piece 14 having a V shape is integrally formed. The hook piece 14 cooperates with the rear end edge 12 of the cowl cover main body 11 to hold the front end edge of the windshield 3 in the vehicle width direction. Between the rear end edge 12 of the cowl cover main body 11 and the hook piece 14, an opening holding portion 15 is formed with the front end edge of the windshield 3 facing obliquely upward so that it can be received.
[0025]
The hook piece 14 is bent upward at a substantially right angle from a rear end edge of the cowl cover main body 11 from the rear surface of the rear end edge 12 of the cowl cover body 11 toward the obliquely lower side of the vehicle rear side, and from the rear end edge of the base piece 14a. And a pressing protrusion 14c that gradually protrudes narrower upward from the tip of the pressing piece 14b. A pair of reinforcing ribs 14d and 14d having a plate shape are integrally formed at the edge portions on both sides in the vehicle width direction of the base piece 14a, the pressing piece 14b, and the pressing protrusion 14c, and a cross section viewed from the front is substantially It has a letter shape. The front end portion of the reinforcing rib 14d extends on the back surface of the cowl cover body 11.
[0026]
The bent portion 16 formed between the base piece 14a and the pressing piece 14b is formed with a through hole 14e that opens in a direction intersecting with each other. This through-hole 14e has a function of positioning and fixing a slide core 23, which will be described later, between a fixed mold (cavity mold) 21 and a movable mold (core mold) 22 during injection molding. In the present embodiment, the through hole 14e is provided in the bent portion 16. However, the present invention is not limited to this, and for example, the base piece 14a and the pressing portion are spaced at a predetermined interval. At least one piece may be provided on the peripheral surface with the piece 14b.
[0027]
On the rear end edge 12 of the cowl cover main body 11 facing the hook piece 14, a stepped step portion 12a is extended. The step portion 12a has a substantially V shape bent in substantially the same direction as the hook piece 14. At the tip of the lower end portion of the stepped portion 12a, a rib portion 12b protruding downward is extended. An elongated seal body 17 made of a foamed rubber material is fixed along the inner portion of the rib portion 12b.
[0028]
FIG. 4 shows a state in which the cowl cover main body 11 of the present invention configured as described above is attached to the vehicle body. In the figure, the center portion of the cowl cover main body 11 is located above the center portion of the conventional cowl cover main body indicated by the alternate long and short dash line and extends substantially horizontally. Compared with the conventional cowl cover main body, The volume of the box 4 is arranged to increase. The glass sandwiching portion 13 has a structure like an outer surface jaw shape that forms a glass sandwiching space having a substantially V shape when viewed from the side, and is obliquely upward facing the front edge of the windshield 3 as described above. Open toward.
[0029]
Since the glass sandwiching portion 13 has an undercut portion shape that opens obliquely upward with respect to the flat portion of the center portion of the cowl cover main body 11, along the glass surface in the direction of arrow A shown in FIG. Undercut treatment that removes the molding die is not possible. A mold 20 constituting the characteristic part of the present invention suitable for releasing the glass sandwiching portion 13 is shown in FIGS. 5 and 6, respectively. 5 is a cross-sectional view of the main part of the mold viewed from the same direction as FIG. 4, and FIG. 6 is viewed from the crossing direction of FIG. 5 and corresponds to the section taken along line III-III in FIG. It is principal part sectional drawing of the metal mold | die of a location.
[0030]
In these drawings, a mold 20 for molding the glass sandwiching portion 13 applied to this embodiment includes a mold 21 that is a first mold, a core 22 that is a second mold, 3 and a slide core 23 which is a mold part. The mold 21 molds the surface of the cowl cover main body 11. The core mold 22 is formed from the back surface of the cowl cover body 11 to the outer surface of the hook piece 14. The slide core 23 forms the rear surface of the rear end edge of the cowl cover body 11 and the inner surface of the hook piece 14.
[0031]
The slide core 23 can be inserted and removed between the cavity mold 21 and the core mold 22 and operates in the direction of arrow B shown in FIG. In the illustrated example, the forward direction is indicated by an arrow B1, and the backward direction is indicated by an arrow B2. The slide core 23 operates in a direction intersecting the operation direction when the mold 21 and the core mold 22 are opened and closed by using well-known driving means, for example, an angular pin, which has been widely known.
[0032]
The cavity mold 21 and the core mold 22 have three guide surfaces 21a, 22a, and 22b that cross each other and that directly guide the slide core 23, respectively. A guide surface 21 a of the mold 21 is a part of an opening molding surface between the rear end edge 12 of the cowl cover main body 11 and the pressing protrusion 14 c of the hook piece 14, and guides one of the core dies 22. The surfaces 22a and 22b are a part of two peripheral surfaces that sandwich the bent portion 16 between the base piece 14a and the pressing piece 14b.
[0033]
As shown in FIGS. 5 and 6, the slide core 23 has a first contact portion 23 a corresponding to the guide surface 21 a of the mold 21 at the tip surface, and the core die 22 at the center of the lower surface. There are two second and third contact portions 23b and 23c corresponding to the guide surfaces 22a and 22b, respectively.
[0034]
When the mold 20 is clamped, the abutting portions 23a to 23c of the slide core 23 abut on the guide surface 21a of the cavity mold 21 and the guide surfaces 22a and 22b of the core mold 22 directly. Guided and inserted between the mold 21 and the core 22. The contact portions 23 a to 23 c of the slide core 23 are positioned by being sandwiched from three directions by guide surfaces 21 a, 22 a, and 22 b of the mold mold 21 and the core mold 22.
[0035]
When the molten resin M is injected after the mold 20 is clamped, the mold mold 21 and the core mold 22 are connected to the parting line P.P. L attempts to open in the left-right direction in FIG. 5, but the parting line P.P. Hold L closed. At this time, the mold clamping pressure acts so as to be sandwiched between the guide surfaces 21 a of the cavity mold 21 and the guide surfaces 22 a and 22 b of the core mold 22 in the contact portions 23 a to 23 c of the slide core 23.
[0036]
Since the slide core 23 supports the contact portions 23a to 23c corresponding to the guide surface 21a of the cavity mold 21 and the guide surfaces 22a and 22b of the core mold 22 respectively so as to cross each other, the slide core 23 is supported. In this case, the molten resin M is not deformed due to the pressure of the molten resin M, and a minute gap is not formed in the joint surface between the slide core 23, the cavity mold 21 and the core mold 22, and the molten resin M is formed in the gap. Does not leak. As a result, the generation of burrs can be prevented. At the same time, the productivity of the cowl cover main body 11 can be improved without requiring a finishing process to remove burrs, the mounting accuracy of the cowl cover main body 11 can be improved, and the appearance quality as an appearance can be improved.
[0037]
In addition, since the appearance molding surface of the cowl cover main body 11 is all set on the side of the mold 21 and the seal body 17 is fixed inside the pressing projection 14c of the hook piece 14, the parting line P.P. The influence of L can be eliminated.
[0038]
It is most effective to match the contact portions 23 a to 23 c of the slide core 23 with the mold clamping direction of the mold 20. At that time, the through-holes 14e formed in the hook piece 14 can be appropriately set to a position and size where the arrangement of the contact portions 23a to 23c matches the mold clamping direction of the mold 20. As can be seen in FIG. 6, the positions of the contact portions 23 a to 23 c can be determined at the center of the cavity of the mold 20, and the slide core 23 can be moved with the minimum necessary and sufficient movement stroke. It can be advanced and retracted and a good undercut process can be performed. Furthermore, the cowl cover 10 with excellent aesthetics can be effectively obtained without seriously affecting the smooth shape of the curved edge.
[0039]
And, in the present embodiment, without increasing the length of the slide core by extending the joint surface of the slide core and the mold from the one side edge of the hook piece forming portion as in the prior art, The moving stroke of the slide core 23 can be minimized, and the size of the mold 20 can be suppressed. That is, the points ZA, ZC, ZD shown in FIG. 5 are arranged on a substantially straight line, and the position of the slide core 23 is best determined.
[0040]
Moreover, since the mold is closed by the mold 21 and the core 22 between the point ZC and the point ZB, no burrs are generated. Since the lower surface of the slide core 23 is substantially V-shaped as clearly shown in FIG. 5, it is possible to suppress the shift between the molds in the vertical direction of FIG. The plate pressure of the base piece 14a can be formed with a predetermined accuracy.
[Brief description of the drawings]
FIG. 1 is a partial perspective view schematically showing a part of a vehicle body to which a cowl top cover according to a representative embodiment of the present invention is attached.
FIG. 2 is a perspective view schematically showing the entirety of the cowl top cover.
FIG. 3 is a perspective view of a main part of the cowl top cover.
4 is a cross-sectional view taken along the line II-II in FIG.
5 is a cross-sectional view of a main part of a mold at a site when viewed from the same direction as FIG. 4. FIG.
6 is a cross-sectional view of a main part of a mold at a portion corresponding to the section taken along line III-III in FIG. 3;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Engine room 2 Bonnet 3 Windshield 4 Cowl box 10 Cowl cover 11 Cowl cover main body 11a Opening 11b Wiper drive shaft hole 11c Recess 12 Rear edge 12a Step part 12b Rib part 13 Glass clamping part 14 Hook piece 14a Base piece 14b Press Piece 14c Press projection 14d Reinforcement rib 14e Through-hole 15 Opening clamping part 16 Bending part 17 Sealing body 20 Mold 21 Fixed mold 21a, 22a, 22b Guide surface 22 Movable mold 23 Slide core 23a-23c First to third contact part M Molten resin

Claims (3)

A plurality of glass clamps having a hook piece projecting intermittently toward the back side along the rear edge of the cowl cover body and sandwiching the front edge of the windshield with the rear edge of the cowl cover body and the hook piece. In a mold for molding a cowl cover for an automobile with a wearing part,
A mold part for molding the glass sandwiching part,
A first mold part for molding the surface of the cowl cover body, a second mold part for molding from the back surface of the cowl cover body to the outer surface of the hook piece, and the first and second mold parts. Between the rear end edge of the cowl cover main body and a third mold part for molding the inner surface of the hook piece,
The first and second mold parts intersect with the first partial peripheral surface on the peripheral surface of the third mold part and facing the insertion / removal direction, and cross the first and second mold parts . A second partial peripheral surface facing the opening / closing direction of the first and second mold parts, and a third direction intersecting with both the insertion / extraction direction and the opening / closing direction of the first and second mold parts. Having a third partial peripheral surface facing and a guide surface for direct guidance;
A cowl cover mold. The three partial peripheral surfaces are an opening molding surface between a rear end edge of the cowl cover main body and a holding end edge of the hook piece, and a part of two peripheral surfaces sandwiching a bent portion of the hook piece. 2. The cowl cover molding die according to claim 1, wherein the die is a cowl cover molding die. A plurality of glass clamps having a hook piece projecting intermittently toward the back side along the rear edge of the cowl cover body and sandwiching the front edge of the windshield with the rear edge of the cowl cover body and the hook piece. A cowl cover for a car with a wearing part,
The hook piece has a base piece that straddles the front edge of the windshield, a pressing piece that is bent from the rear edge of the base, and the tip presses the back surface of the glass,
At least the base piece and the pressing piece have through holes,
A cowl cover characterized by that.

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