JP3901591B2 - Urethane skin mold - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a urethane skin molding die, and more specifically, has a skin molding surface having a required outer edge contour shape and a receiving surface surrounding the outer edge of the skin molding surface, and uses the spraying device to form the skin. When the urethane material is sprayed and applied to the entire surface of the molding surface, the urethane material deviating from the skin molding surface relates to a urethane skin molding die which is sprayed onto the receiving surface.
[0002]
[Prior art]
For example, a passenger compartment in a vehicle such as a passenger car is equipped with various vehicle interior members such as an instrument panel, a floor console, a door panel, an armrest, and a pillar garnish. Since these vehicle interior members have their own color, design, texture, etc. greatly affect the atmosphere, texture, etc. in the passenger compartment, the vehicle interior members are required to improve texture and produce a high-class feeling. . Therefore, in the vehicle interior member, the outer surface of a synthetic resin base material molded into a required shape by injection molding technology or the like is covered with a skin formed by vacuum molding technology, powder slush molding technology, urethane spray molding technology, or the like. A technique to improve the texture by wearing it is adopted.
[0003]
FIG. 9 is an explanatory cross-sectional view schematically showing a state in which a urethane skin is molded by a urethane skin molding die based on the urethane spray molding technique. On the upper surface of the urethane skin molding die 10, the outer surface shape and outer edge contour shape of the urethane skin 40 that is the final molded product, and the outer edge of the skin molding surface 12 are surrounded by the outer skin shape 12. A skin molding surface 12 and a continuously formed receiving surface 14 are formed, and a spray gun 18 sprays and applies the urethane material U uniformly over the entire surface of the skin molding surface 12 so that it is necessary. A thick urethane skin 40 can be formed. Here, in the spray application process of the urethane material U by the spray gun 18, the urethane material U is diffused as shown in FIG. 10, and the urethane material U is disposed near the outer edge of the skin molding surface 12. When the material U is sprayed and applied, a part of the material U deviates from the area of the skin molding surface 12. For this reason, the urethane material U1 deviating from the skin molding surface 12 is sprayed onto the receiving surface 14.
[0004]
Since the outer edge of the skin molding surface 12 and the receiving surface 14 are continuously formed at the same height, the urethane material U sprayed onto the skin molding surface 12 and the receiving surface 14 are sprayed. The formed urethane material U1 is cured in a state of being connected to each other. For this reason, the unnecessary terminal part 42 shape | molded by hardening of the urethane material U1 is integrally formed in the outer edge of the urethane skin 40 shape | molded by hardening of the urethane material U. As shown in FIG. Therefore, according to the conventional urethane skin molding die 10 shown in FIG. 9, in the next step after the molding of the urethane skin 40 is completed, the integrally formed unnecessary terminal portion 42 is separated from the outer edge of the urethane skin 40. Thus, the urethane skin 40 having an outer edge terminal shape along the shape of the outer edge contour portion of the skin molding surface 12 is molded. A convex protrusion 16 having a substantially triangular cross-sectional shape is extended at the boundary between the skin molding surface 12 and the receiving surface 14, thereby the boundary between the urethane skin 40 and the unnecessary terminal portion 42. It is considered that the unnecessary terminal portion 42 can be easily separated from the urethane skin 40 by forming a thin trim line 44 in the portion.
[0005]
[Problems to be solved by the invention]
By the way, the conventional urethane skin molding die 10 shown in FIG. 9 is configured as a single molding surface in which the skin molding surface 12 and the receiving surface 14 are continuous at the same height, as described above. The urethane material U sprayed and applied to the skin molding surface 12 and the urethane material U1 sprayed to the receiving surface 14 are cured in a connected state, and therefore are not necessarily required on the outer edge of the urethane skin 40. A terminal portion 42 is formed. For this reason, after the curing of each of the urethane materials U and U1 is completed, an operation step of separating the unnecessary terminal portion 42 from the outer edge of the molded urethane skin 40 is necessary. Specifically, (1) a method of separating the urethane skin 40 from the urethane skin molding die 10 before removing the mold (FIG. 11) and (2) a method of separating the urethane skin 40 from the urethane skin molding die 10 after removing the mold. (FIG. 12) One of the methods is selectively performed.
[0006]
Among these methods, the method (1) is such that after the curing of the urethane materials U and U1, the unnecessary terminal portion 42 is first separated from the urethane skin 40 while being peeled off from the receiving surface 14 (FIG. 11 (a)). The urethane skin 40 is removed from the skin molding surface 12 (FIG. 11B). However, this method has a problem that the molding efficiency of the urethane skin 40 is lowered because the mold removal operation takes time and the molding cycle time becomes long. Further, a special tool having a spatula shape for peeling the unnecessary terminal portion 42 from the receiving surface 14 is required, and when the unnecessary terminal portion 42 is cut off, the cutting along the trim line 44 cannot be performed appropriately. In addition, there is a problem in that the end portion of the urethane skin 40 is torn.
[0007]
In the method (2), after the urethane materials U and U1 are completely cured, the urethane skin 40 and the unnecessary terminal portion 42 are first removed integrally (FIG. 12A), and then the unnecessary terminal portion 42 is formed. Is separated from the urethane skin 40 (FIG. 12B). Although this method can avoid the inconvenience that the cycle time of the molding line becomes long, it requires an operation of separating the unnecessary terminal portion 42 from the urethane skin 40 in the next step, so that the urethane skin 40 is the same as the method (1). There is a problem that the molding efficiency cannot be improved. Moreover, since the urethane skin 40 is flexible, when the unnecessary terminal portion 42 is cut off, the urethane skin 40 may be broken or wrinkled, or the urethane skin cannot be properly cut off. There was also a problem that inconveniences such as tearing of the 40 terminal portions occurred.
[0008]
OBJECT OF THE INVENTION
The present invention has been proposed to suitably solve the above-described problems. By eliminating the need to separate the molded urethane skin and unnecessary terminal portions, the urethane skin can be made more efficient and streamlined. An object of the present invention is to provide a urethane skin mold that can be designed.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems and achieve the intended object, the present invention has a skin forming surface having a required outer edge contour shape and a receiving surface surrounding the outer edge of the skin forming surface, and uses a spraying device. When the urethane material is sprayed and applied to the entire surface of the skin molding surface, the urethane material that deviates from the skin molding surface is sprayed onto the receiving surface,
By separating the skin molding surface at a required distance from the receiving surface, the urethane material sprayed onto the skin molding surface and the urethane material sprayed onto the receiving surface are separated from each other,
Accordingly, the urethane skin after curing is configured to have an outer edge terminal shape along the shape of the outer edge contour portion of the skin molding surface.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, the urethane skin and the molding method thereof according to the present invention will be described below with reference to the accompanying drawings by giving preferred examples. In the description of the prior art, the same members and parts as those already described in FIGS. 9 to 12 will be described with the same reference numerals.
[0011]
1 is a schematic cross-sectional view of a urethane skin mold according to a preferred embodiment of the present invention, FIG. 2 is a schematic perspective view showing the skin mold in a broken state, and FIG. 3 is an enlarged view of a portion A in FIG. The urethane skin molding die 20 of the present embodiment has, on its upper surface side, a skin molding surface 12 having an outer surface shape and an outer edge contour shape of the urethane skin 40 to be a final molded product, and an outer edge of the skin molding surface 12. And a receiving surface 14 formed so as to surround the surface. Although not shown, on the back side from the skin molding surface 12 to the receiving surface 14, a heating pipe through which a heat medium such as water or oil circulates is laid in a meandering manner, and the surface of the skin molding surface 12 and the receiving surface 14. The temperature can be kept warm by heating to an optimum temperature (for example, about 65 ° C.) for curing the urethane material U (U1).
[0012]
The skin molding surface 12 is spaced apart from the receiving surface 14 with a required distance, whereby the urethane material U sprayed onto the skin molding surface 12 and the sprayed onto the receiving surface 14. The urethane material U1 can be separated from each other. Specifically, when the spraying direction of the urethane material U by the spray gun (spraying device) 18 is used as a reference, the skin molding surface 12 is separated from the receiving surface 14 to the front side by a predetermined distance. That is, in the urethane skin mold 20 of the embodiment, the skin molding surface 12 and the receiving surface 14 formed on the upper surface of the molding die 20 are directed upward, and the spray gun 18 applies the surface to the skin molding surface 12. Since the spraying direction of the urethane material U is downward (FIG. 4), the skin molding surface 12 is formed to be spaced above the receiving surface 14. Here, the separation distance (step) H between the skin molding surface 12 and the receiving surface 14 is set to 15 mm or more, for example.
[0013]
And, between the outer edge contour portion of the skin molding surface 12 and the inner edge contour portion of the receiving surface 14, the urethane material U <b> 1 evacuated from the spraying direction of the spray gun 18 and deviated from the skin molding surface 12. A contour end face 24 is formed to prevent the spraying of. As shown in FIG. 3, the contour end surface 24 preferably has an inclination angle α with respect to the receiving surface 14 set within a range of 60 degrees (overhang state) to 90 degrees (vertical state). The case is set to a slight overhang state at about 80 degrees. As a result, as shown in FIG. 4, when the urethane material U is sprayed and applied to the skin molding surface 12 with the spray gun 18, all the urethane material U1 deviating from the skin molding surface 12 is blown onto the contour end surface 24. It is sprayed to the receiving surface 14 without being attached. Therefore, since the urethane material U1 is not sprayed at all on the contour end surface 24, the urethane material U sprayed onto the skin molding surface 12 and the urethane material U1 sprayed onto the receiving surface 14 are surely provided. Separated.
[0014]
Further, the outer edge contour portion of the skin molding surface 12 is a hook-shaped protruding edge 26 extending in an acute angle toward the upper side of the receiving surface 14 (upward with respect to the blowing direction of the urethane material U). . The hook-shaped protruding edge 26 includes a surface obtained by extending the contour end surface 24 and an inclined molding surface 28 having an inclination angle β of 120 to 135 degrees with respect to the horizontal plane of the skin molding surface 12. The upward projecting height S from 12 is about 3 to 4 mm, and the base width W is about 2 to 3 mm. As a result, the tip of the hook-shaped protruding edge 26 has an acute angle of about 30 degrees, and the spray gun 18 applies urethane material U to the outer edge contour portion of the skin forming surface 12 (the inclined forming surface 28 of the hook-shaped protruding edge 26). If it is surely sprayed and applied to the end edge of the urethane skin 40, the end portion of the molded urethane skin 40 can be accurately and reliably cut off.
[0015]
Further, in the vicinity of the inner side along the outer edge contour portion of the skin molding surface 12, a linear staying concave portion (recess portion) 30 is extended along the outer edge contour portion. This staying recess 30 is a portion defined by the skin molding surface 12 and the inclined molding surface 28 as a recess as a result of the outer edge contour portion of the skin molding surface 12 being the ridge-shaped protruding edge 26. Thereby, when the urethane material U is sprayed and applied to the outer edge contour portion of the skin molding surface 12 by the spray gun 18, the vicinity of the staying recess 30 becomes a so-called puddle and the urethane material U is placed in the staying recess 30. It will stay. Furthermore, a part of the urethane material U sprayed and applied to the inclined molding surface 28 of the bowl-shaped protruding edge 26 moves along the inclined molding surface 28 toward the stay recess 30. As a result, the urethane material U stays thicker in the staying recess 30 than the other part and hardens as it is. Therefore, the urethane skin 40 formed on the skin molding surface 12 has a portion along its end portion. The thick part 46 is extended integrally (FIG. 5).
[0016]
In the urethane skin molding die 20 of this embodiment configured as described above, when the urethane material U is sprayed and applied to the entire surface of the skin molding surface 12 by the spray gun 18, the urethane material deviated from the skin molding surface 12 is applied. U1 is sprayed onto the receiving surface 14 spaced apart from the skin forming surface 12 by a predetermined distance. Accordingly, the urethane material U applied to the skin molding surface 12 and the urethane material U1 sprayed to the receiving surface 14 are cured separately in a state of being separated from each other. The post-process for separating the unnecessary terminal portion 42 from the outer edge of the 40 can be omitted, and the molding operation of the urethane skin 40 can be rationalized.
[0017]
Further, by providing the ridge-shaped protruding edge 26 on the outer edge contour portion of the skin molding surface 12, if the urethane material U is sprayed and applied over the entire surface of the skin molding surface 12, the skin The end of the urethane skin 40 formed on the molding surface 12 can be accurately and reliably cut off, and the urethane skin 40 having an outer edge terminal shape along the outer edge contour shape of the skin molding surface 12 can be accurately molded. . Accordingly, the urethane skin 40 molded in close contact with the skin molding surface 12 has its terminal portion facing the outer edge contour portion of the skin molding surface 12 (FIG. 5), so that the terminal portion can be easily touched with a fingertip or the like. In addition to being able to grip, the mold can be easily removed (FIG. 6).
[0018]
Furthermore, by extending the linear staying recess 30 along the outer edge contour portion of the skin molding surface 12, the urethane skin 40 molded on the skin molding surface 12 has a thick portion 46 along its terminal portion. Are integrally extended. Therefore, since the end portion of the molded urethane skin 40 is difficult to tear by the thick portion 46, it is possible to suitably avoid the inconvenience that the terminal portion is torn during the demolding operation of the urethane skin 40.
[0019]
In the urethane skin molding die 20 of the embodiment, the separation distance (step) H between the skin molding surface 12 and the receiving surface 14 is such that the urethane material U1 sprayed onto the receiving surface 14 in one molding of the urethane skin 40 is performed. Since the thickness is set to be considerably larger than the thickness, after the molding operation of the urethane skin 40 is performed a plurality of times (for example, about 10 times), the unnecessary terminal portions 42 stacked on the receiving surface 14 are collectively removed. That's fine. That is, since it is not necessary to peel off the unnecessary terminal portion 42 from the receiving surface 14 every time the urethane skin 40 is molded, the efficiency of the molding operation and the time reduction can be suitably achieved. Note that if the separation distance (step) H is set to be larger, it is possible to further lengthen the removal work cycle of the unnecessary terminal portion 42.
[0020]
[Modification]
FIG. 7 is an explanatory cross-sectional view showing a state in which the urethane material U is sprayed by the spray gun 18 onto the outer edge contour portion of the skin molding surface 12 in the urethane skin molding die 20 according to the modification. In the above-described embodiment, as described above, the acute-angled hook-shaped protruding edge 26 is projected along the outer edge contour portion of the skin molding surface 12, and as a result, a line is formed along the outer edge contour portion of the skin molding surface 12. The above-described staying recess 30 is defined. On the other hand, in the modification, the inclination angle α of the contour end surface 24 is set to about 60 degrees, and the degree of overhang is set large, while the cross section along the outer edge contour portion of the skin forming surface 12 has a substantially arc shape. As a result of extending the staying recess 30 to be linearly formed, the outer edge contour portion of the skin forming surface 12 is formed as a hook-shaped protruding edge 26 extending upwardly above the receiving surface 14.
[0021]
Also in the urethane skin molding die 20 according to such a modification, the urethane material U sprayed onto the skin molding surface 12 and the urethane material U1 sprayed onto the receiving surface 14 are separated from each other, thereby The urethane skin 40 having an outer edge terminal shape along the shape of the outer edge contour portion of the skin molding surface 12 can be molded. Therefore, it is possible to obtain the same effect as the urethane skin mold 20 illustrated in the above embodiment.
[0022]
The urethane skin mold of the present application is for molding a urethane skin to be implemented on vehicle interior members such as instrument panels, floor consoles, door panels, armrests, and pillar garnishes installed in passenger compartments of vehicles such as passenger cars. Needless to say, the urethane skin mold can be suitably applied to a urethane skin mold for molding a urethane skin to be applied to various other articles (such as furniture).
[0023]
【The invention's effect】
As described above, according to the urethane skin molding die according to the present invention, after the molding of the urethane skin molded on the skin molding surface is completed, the post-process for separating the unnecessary terminal portion from the outer edge of the urethane skin is omitted. There is an advantage that the molding operation can be rationalized. Moreover, since the urethane skin having the outer edge terminal shape along the shape of the outer edge contour portion of the skin molding surface can be accurately molded, the end portion of the urethane skin molded in close contact with the skin molding surface can be formed with a fingertip or the like. The urethane skin can be easily gripped and the urethane skin can be easily removed. Furthermore, since the thick wall portion is integrally extended along the terminal portion of the molded urethane skin, there is an advantage that it is possible to preferably avoid the inconvenience of tearing the terminal portion during the demolding operation of the urethane skin. is there.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of a urethane skin mold according to a preferred embodiment of the present invention.
FIG. 2 is a schematic perspective view showing the urethane skin mold shown in FIG. 1 in a broken state.
FIG. 3 is an enlarged view of a portion A in FIG.
FIG. 4 is an explanatory cross-sectional view showing a state in which urethane material is sprayed and applied to an outer edge contour portion on the skin molding surface by a spray gun, and the urethane material deviating from the skin molding surface is separated from the skin molding surface. It is shown that the urethane material sprayed onto the skin molding surface and the urethane material sprayed onto the receiving surface are separated from each other by being sprayed onto the receiving surface.
FIG. 5 is an explanatory cross-sectional view showing a state where the urethane material sprayed onto the skin molding surface and the urethane material sprayed onto the receiving surface are gradually cured.
FIG. 6 is an explanatory cross-sectional view showing a state in which the urethane skin formed on the skin molding surface is removed after the urethane material is cured.
FIG. 7 is an explanatory cross-sectional view showing a state in which a urethane material is sprayed by a spray gun to an outer edge contour portion of a skin molding surface in a urethane skin molding die according to a modified example.
8 is an explanatory cross-sectional view showing a state in which the urethane skin formed on the skin molding surface is removed after the urethane material is cured in the urethane skin molding die according to the modified example shown in FIG.
FIG. 9 is a schematic cross-sectional view of a conventional urethane skin mold.
10 is an explanatory cross-sectional view showing a state in which a urethane material is sprayed and applied to the outer edge contour portion on the skin molding surface in the conventional urethane skin molding die shown in FIG. The urethane material deviated from the surface is sprayed onto the receiving surface continuous with the skin molding surface, so that the urethane material sprayed onto the skin molding surface and the urethane material sprayed onto the receiving surface are connected. It is shown that.
FIG. 11 is an explanatory cross-sectional view illustrating a method for removing a urethane skin molded by the urethane skin molding die shown in FIG. 9, wherein (a) is a plan view of the urethane skin while peeling off unnecessary terminal portions from the receiving surface. The state which cut | disconnects is shown, (b) has shown the state which demolds a urethane skin from a skin molding surface.
12 is an explanatory cross-sectional view illustrating another method for demolding a urethane skin molded by the urethane skin molding die shown in FIG. 9, wherein (a) shows a receiving surface and a skin of an unnecessary terminal portion and a urethane skin. The state which removes | molds integrally from a shaping | molding surface is shown, (b) has shown the state which cut | disconnects an unnecessary terminal part from the removed urethane skin.
[Explanation of symbols]
12 skin forming surface, 14 receiving surface 18 spray gun (spraying device), 24 contour end surface 26 bowl-shaped protruding edge, 30 retention recess (recess)
40 Urethane skin, 46 Thick part U, U1 Urethane material

Claims (5)

A skin molding surface (12) having a required outer edge contour shape and a receiving surface (14) surrounding the outer edge of the skin molding surface (12), and using the spraying device (18), the skin molding surface ( When the urethane material (U) is sprayed and applied to the entire surface of 12), the urethane material (U1) deviating from the skin molding surface (12) is sprayed onto the receiving surface (14). )
The urethane molding (U) sprayed onto the skin molding surface (12) and the receiving surface (14) are sprayed by separating the skin molding surface (12) from the receiving surface (14) with a predetermined distance. Separating the attached urethane material (U1) from each other;
Thereby, the urethane skin (40) after curing is configured to have an outer edge terminal shape along the shape of the outer edge contour portion of the skin molding surface (12). The skin forming surface (12) is spaced forward from the receiving surface (14) at a predetermined distance from the receiving surface (14) with respect to the direction in which the urethane material (U) is sprayed by the spraying device (18). Urethane skin mold. Between the outer edge contour portion of the skin molding surface (12) and the inner edge contour portion of the receiving surface (14), the urethane material (U) is prevented from being sprayed by retreating from the spraying direction of the urethane material (U). The urethane skin mold according to claim 1 or 2, wherein a contoured end face (24) is formed. The outer edge contour portion of the skin molding surface (12) is a bowl-shaped protruding edge (26) extending in an acute angle toward the upper side of the receiving surface (14). The described urethane skin mold. A portion of the urethane material (U) sprayed and applied to the skin molding surface (12) by extending a linear recess (30) in the vicinity of the inside along the outer edge contour portion of the skin molding surface (12). The thick portion (46) can be integrally extended along the end portion of the urethane skin (40) after being cured by being retained in the recess (30) and cured. Item 5. A urethane skin mold according to any one of Items 1 to 4.

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