JP2004017441A - Mold for molding urethane skin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently and rationally perform the molding work of a urethane skin. <P>SOLUTION: A skin molding surface 12 for molding a urethane skin is allowed to be spaced apart from a receiving surface 14 over a required distance to mutually separate the urethane material U applied to the skin molding surface 12 and the urethane material U1 sprayed on the receiving surface U1 excepting the sking molding surface 12. By this constitution, a urethane skin molded by curing the urethane U appliced to the skin molding surface by spray coating has an outer edge terminal shape along the shape of the outer edge contour part of the skin forming surface 12. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a urethane skin molding die, and more particularly, 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. When the urethane material is sprayed and applied to the entire surface of the molding surface, the urethane material deviating from the surface molding surface relates to a urethane skin molding die that is sprayed onto the receiving surface.
[0002]
[Prior art]
For example, in a passenger compartment of a vehicle such as a passenger car, various vehicle interior members such as an instrument panel, a floor console, a door panel, an armrest, and a pillar garnish are provided. In these vehicle interior members, the color, design, texture, and the like of the vehicle interior greatly affect the atmosphere, texture, and the like in the occupant compartment. . Therefore, in the vehicle interior member, a skin molded based on a vacuum molding technology, a powder slush molding technology, a urethane spray molding technology, or the like is coated on an outer surface of a synthetic resin base material molded into a required shape by an injection molding technology or the like. A method of improving the texture by wearing is adopted.
[0003]
FIG. 9 is an explanatory 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, a skin molding surface 12 having an outer shape and an outer edge contour shape of a urethane skin 40 which is a final molded product, and an outer edge of the skin molding surface 12. A skin forming surface 12 and a continuously formed receiving surface 14 are formed, and the urethane material U is uniformly sprayed and applied over the entire surface of the skin forming surface 12 with a spray gun 18, so that the required surface is formed. A thick urethane skin 40 can be formed. Here, in the spray coating process of the urethane material U by the spray gun 18, the urethane material U is blown out in a diffused manner as shown in FIG. When the material U is applied by spraying, a part of the material U is deviated outside the region of the skin molding surface 12. For this reason, the urethane material U1 deviating from the skin forming surface 12 is sprayed on the receiving surface 14.
[0004]
Since the outer edge of the skin forming surface 12 and the receiving surface 14 are continuously formed at the same height, the urethane material U sprayed and applied to the skin forming surface 12 and the receiving surface 14 are sprayed. The obtained urethane material U1 is cured while being connected to each other. Therefore, an unnecessary terminal portion 42 formed by curing the urethane material U1 is integrally formed on the outer edge of the urethane skin 40 formed by curing the urethane material U. Therefore, according to the conventional urethane skin mold 10 shown in FIG. 9, the unnecessary terminal portion 42 integrally formed is separated from the outer edge of the urethane skin 40 in the next step after the completion of the formation 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 formed. At the boundary between the skin forming surface 12 and the receiving surface 14, a protruding protruding piece 16 having a substantially triangular cross-sectional shape is extended, thereby forming a boundary between the urethane skin 40 and the unnecessary terminal portion 42. It is considered that the unnecessary end portion 42 can be easily separated from the urethane skin 40 by forming a thin trim line 44 at the portion.
[0005]
[Problems to be solved by the invention]
Meanwhile, the conventional urethane skin molding die 10 shown in FIG. 9 has a configuration in which the skin molding surface 12 and the receiving surface 14 are formed as a single molding surface that is continuous at the same height, as described above. The urethane material U sprayed and applied to the skin forming surface 12 and the urethane material U1 sprayed to the receiving surface 14 are cured in a connected state, so that the urethane material U1 is not necessarily required on the outer edge of the urethane skin 40. The terminal portion 42 is formed. For this reason, after the curing of each of the urethane materials U and U1 is completed, a work step of separating the unnecessary terminal portion 42 from the outer edge of the molded urethane skin 40 is required. Specifically, (1) a method of separating the urethane skin 40 from the urethane skin molding die 10 before removing it (FIG. 11), and a (2) a method of separating the urethane skin 40 from the urethane skin molding die 10 after removing the mold. (FIG. 12).
[0006]
In the method (1), 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. 11A). The urethane skin 40 is removed from the skin molding surface 12 (FIG. 11B). However, in this method, since the demolding operation takes time and the molding cycle time becomes longer, there is an inherent problem that the molding efficiency of the urethane skin 40 is reduced. In addition, a special tool in the form of a spatula for separating the unnecessary terminal portion 42 from the receiving surface 14 is required, and when the unnecessary terminal portion 42 is separated, the cutting along the trim line 44 cannot be performed properly. In addition, there is also a problem that the terminal portion of the urethane skin 40 may be broken.
[0007]
In the method (2), after the curing of the urethane materials U and U1, the urethane skin 40 and the unnecessary terminal portion 42 are first integrally removed (FIG. 12A), and then the unnecessary terminal portion 42 is removed. Is separated from the urethane skin 40 (FIG. 12B). In this method, the disadvantage that the cycle time of the molding line becomes long can be avoided, but since the work of separating the unnecessary terminal portion 42 from the urethane skin 40 is required in the next step, the urethane skin 40 is required in the same manner as in the method (1). There is a problem that the molding efficiency cannot be improved. Moreover, since the urethane skin 40 has flexibility, the urethane skin 40 may be creased or wrinkled when the unnecessary terminal portion 42 is cut off, or the urethane skin cannot be cut off properly. There was also a problem that inconveniences such as tearing of the terminal portion of 40 occurred.
[0008]
[Object of the invention]
The present invention has been proposed in order to suitably solve the above-mentioned problems, and eliminates the need for separating the molded urethane skin and unnecessary terminal portions, thereby improving the efficiency and rationalization of the urethane skin molding operation. An object of the present invention is to provide a urethane skin mold that can be achieved.
[0009]
[Means for Solving the Problems]
In order to solve the above 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 utilizes a spraying device. When spraying and applying a urethane material to the entire surface of the skin molding surface, the urethane material that has deviated from the skin molding surface is a urethane skin molding die that can be sprayed on the receiving surface.
By separating the skin molding surface from the receiving surface with a required distance, the urethane material spray-coated on the skin molding surface and the urethane material sprayed on the receiving surface are separated from each other,
Thereby, 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]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, a urethane skin and a method for forming the same according to the present invention will be described below with reference to the accompanying drawings by way of preferred embodiments. In the description of the related art, the same members and portions as those already described in FIGS. 9 to 12 are denoted by the same reference numerals and described.
[0011]
1 is a schematic 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 shape and an outer edge contour shape of a urethane skin 40 as a final molded product, and an outer edge of the skin molding surface 12. And a receiving surface 14 formed so as to surround. Although not shown, a heating pipe through which a heat medium such as water or oil flows is laid in a meandering shape on the back side from the skin forming surface 12 to the receiving surface 14, and the surfaces of the skin forming surface 12 and the receiving surface 14 are arranged. The temperature can be heated and kept at the optimal temperature (for example, about 65 ° C.) for curing the urethane material U (U1).
[0012]
The skin molding surface 12 is separated from the receiving surface 14 by a predetermined distance, whereby the urethane material U sprayed and applied to the skin molding surface 12 and the urethane material U sprayed on the receiving surface 14 are formed. The urethane material U1 can be separated from each other. Specifically, based on the direction in which the urethane material U is sprayed by the spray gun (spraying device) 18, the skin forming surface 12 is separated from the receiving surface 14 by a required distance toward the front. That is, in the urethane skin molding die 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 is applied to the skin molding surface 12. Since the spraying direction of the urethane material U is downward (FIG. 4), the skin forming surface 12 is formed above the receiving surface 14 so as to be separated from the receiving surface 14. Here, the separation distance (step) H between the skin forming surface 12 and the receiving surface 14 is set to, for example, 15 mm or more.
[0013]
Then, 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 retreating from the spraying direction of the spray gun 18 and deviating from the skin molding surface 12. Is formed at the end face 24 of the contour. As shown in FIG. 3, the contour end surface 24 preferably has an inclination angle α with respect to the receiving surface 14 within the range of 60 degrees (overhang state) to 90 degrees (vertical state). In this case, a slight overhang is set at about 80 degrees. Thus, as shown in FIG. 4, when the urethane material U is spray-applied to the skin molding surface 12 by the spray gun 18, all the urethane material U1 deviating from the skin molding surface 12 is sprayed on the contour end surface 24. It can be sprayed onto the receiving surface 14 without being attached. Therefore, since the urethane material U1 is not sprayed at all on the contour end face 24, the urethane material U sprayed and applied to the skin forming surface 12 and the urethane material U1 sprayed on the receiving surface 14 are reliably formed. Is separated into
[0014]
The outer edge contour portion of the skin forming surface 12 is a flange-shaped protruding edge 26 extending at an acute angle toward the upper side of the receiving surface 14 (upward with respect to the spraying direction of the urethane material U). . The flange-shaped protruding edge 26 is composed of a surface 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 a horizontal plane of the skin molding surface 12. The protruding height S from the top 12 is about 3 to 4 mm, and the width W of the base is about 2 to 3 mm. As a result, the tip of the flange 26 has an acute angle of about 30 degrees, and the urethane material U is sprayed by the spray gun 18 onto the outer contour of the skin molding surface 12 (the inclined molding surface 28 of the flange 26). (Edge) of the urethane skin 40 can be accurately and reliably cut off.
[0015]
Further, in the vicinity of the inside along the outer edge contour portion of the skin molding surface 12, a linear retention recess (recess) 30 extending along the outer edge contour portion is extended. The stagnant concave portion 30 is a portion defined in a concave shape by the skin forming surface 12 and the inclined forming surface 28 as a result of the outer contour portion of the skin forming surface 12 being the flange-shaped protrusion 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 stagnation recess 30 becomes a so-called stagnation, and the urethane material U is in the stagnation recess 30. Become stagnant. Further, a part of the urethane material U sprayed and applied to the inclined forming surface 28 of the flange 26 is moved toward the stagnant recess 30 along the inclined forming surface 28. As a result, the urethane material U stays thicker in the stagnation recess 30 than other portions and hardens as it is, so that the urethane skin 40 formed on the skin molding surface 12 extends along the terminal portion thereof. The thick portion 46 is integrally extended (FIG. 5).
[0016]
In the urethane skin molding die 20 of the present embodiment configured as described above, when the spray gun 18 sprays and applies the urethane material U to the entire surface of the skin molding surface 12, the urethane material deviating from the skin molding surface 12 is sprayed. U1 is sprayed on the receiving surface 14 which is separated from the skin forming surface 12 by a predetermined distance. Therefore, the urethane material U applied to the skin molding surface 12 and the urethane material U1 sprayed to the receiving surface 14 are separately cured while being separated from each other, and after the urethane skin 40 is completely formed, the urethane skin is completed. A post-process for separating the unnecessary terminal portion 42 from the outer edge of the outer skin 40 can be omitted, and the molding operation of the urethane skin 40 can be rationalized.
[0017]
In addition, by providing the flange-shaped protruding edge 26 at 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 the outer edge terminal shape along the outer edge contour shape of the skin molding surface 12 can be accurately formed. . Therefore, since the urethane skin 40 molded in a state of being 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), the terminal portion can be easily touched with a fingertip or the like. It can be turned up and grasped, and can be easily removed from the mold (FIG. 6).
[0018]
Further, by extending the linear recessed portion 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 the terminal portion. Are integrally extended. Therefore, since the end portion of the formed urethane skin 40 is not easily torn by the thick portion 46, the inconvenience of tearing the end portion of the urethane skin 40 during the demolding operation can be suitably avoided.
[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 determined by the urethane material U1 sprayed on the receiving surface 14 when the urethane skin 40 is molded once. Since the thickness is set to be much larger than the thickness, after performing the forming operation of the urethane skin 40 a plurality of times (for example, about 10 times), the unnecessary terminal portions 42 stacked on the receiving surface 14 are collectively removed. Just fine. That is, it is not necessary to peel off the unnecessary terminal portion 42 from the receiving surface 14 each time the urethane skin 40 is formed, so that the efficiency of the forming operation and the time can be suitably reduced. If the separation distance (step) H is set to be larger, the work cycle for removing the unnecessary terminal portion 42 can be further lengthened.
[0020]
[Modification]
FIG. 7 is an explanatory 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 flange-shaped protruding edge 26 protrudes along the outer edge contour portion of the skin molding surface 12, and as a result, the line extends along the outer edge contour portion of the skin molding surface 12. The stagnation recess 30 is defined. On the other hand, in a modified example, while the degree of overhang is set to be large by setting the inclination angle α of the contour end face 24 to about 60 degrees, the cross section along the outer edge contour portion of the skin molding surface 12 has a substantially arc shape. As a result of linearly extending the presenting recess 30, the outer edge contour portion of the skin forming surface 12 is formed as a flange-shaped protruding edge 26 extending at an acute angle above the receiving surface 14.
[0021]
Also in the urethane skin molding die 20 according to such a modification, 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 separated from each other. It is possible to mold 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. Therefore, it is possible to obtain the same effect as the urethane skin mold 20 illustrated in the above embodiment.
[0022]
The urethane skin molding die of the present application is used for molding urethane skin to be carried out on vehicle interior members such as an instrument panel, a floor console, a door panel, an armrest and a pillar garnish, which are installed in a passenger compartment of a vehicle such as a passenger car. The present invention can be suitably applied not only to a urethane skin mold but also to a urethane skin mold for molding a urethane skin to be applied to various other articles (for example, furniture and the like).
[0023]
【The invention's effect】
As described above, according to the urethane skin molding die according to the present invention, after completion of the molding of the urethane skin molded on the skin molding surface, a post-process for separating an unnecessary terminal portion from the outer edge of the urethane skin is omitted. Therefore, there is an advantage that the molding operation can be rationalized. Further, 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 terminal portion of the urethane skin molded in close contact with the skin molding surface is touched with a fingertip or the like. The urethane skin can be easily turned up and gripped, and the urethane skin can be easily removed with this. Further, since the thick portion is integrally extended along the end portion of the molded urethane skin, there is also an advantage that the inconvenience that the end portion is torn during the demolding work of the urethane skin can be preferably avoided. is there.
[Brief description of the drawings]
FIG. 1 is a schematic 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. 1;
FIG. 4 is an explanatory cross-sectional view showing a state in which a urethane material is sprayed and applied to an outer edge contour portion on a skin molding surface by a spray gun, and the urethane material deviating from the skin molding surface is separated from the skin molding surface. This shows that the urethane material sprayed on the skin forming surface and the urethane material sprayed on the receiving surface are separated from each other by being sprayed on the receiving surface.
FIG. 5 is an explanatory cross-sectional view showing a state in which the urethane material sprayed on the skin molding surface and the urethane material sprayed on the receiving surface are gradually hardened.
FIG. 6 is an explanatory cross-sectional view showing a state in which the urethane skin formed on the skin forming surface is released after the urethane material is cured.
FIG. 7 is an explanatory sectional view showing a state in which a urethane material is sprayed by a spray gun on 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, after the urethane material is cured, the urethane skin molded on the skin molding surface is removed from the urethane skin molding die according to the modification shown in FIG.
FIG. 9 is a schematic cross-sectional view of a urethane skin mold that has been conventionally implemented.
FIG. 10 is an explanatory cross-sectional view showing a state in which a urethane material is sprayed and applied by a spray gun to an outer edge contour portion of a skin molding surface in the conventional urethane skin molding die shown in FIG. 9; The urethane material deviated from the surface is sprayed on the receiving surface that is continuous with the skin molding surface, so that the urethane material spray-coated on the skin molding surface and the urethane material sprayed on the receiving surface are connected. It is shown that.
11 is an explanatory cross-sectional view illustrating a method for removing the urethane skin molded using the urethane skin mold shown in FIG. 9; FIG. 11 (a) illustrates a method for removing an unnecessary terminal portion from a receiving surface while removing an unnecessary terminal portion from the receiving surface; (B) shows a state in which the urethane skin is removed from the skin molding surface.
12 is an explanatory cross-sectional view illustrating another method for removing the urethane skin molded using the urethane skin molding die shown in FIG. 9; FIG. 12 (a) illustrates an unnecessary terminal portion and the urethane skin covered with the receiving surface and the skin; FIG. 4B shows a state in which the unnecessary terminal portion is separated from the molded urethane skin, and FIG.
[Explanation of symbols]
12 skin forming surface, 14 receiving surface 18 spray gun (spraying device), 24 contour end surface 26 flange-shaped protruding edge, 30 stagnant recess (recess)
40 urethane skin, 46 thick part U, U1 urethane material

Claims (5)

It has 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 the spray molding device (18) is used to form the skin molding surface (12). When the urethane material (U) is spray-coated on the entire surface of the urethane material (U1), the urethane material (U1) which has deviated from the surface molding surface (12) is sprayed on the receiving surface (14). )
By separating the skin forming surface (12) from the receiving surface (14) by a predetermined distance, the urethane material (U) sprayed and applied to the skin forming surface (12) and the receiving surface (14) are blown. The attached urethane material (U1) is separated 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). 2. The skin forming surface (12) is spaced forward from a receiving surface (14) by a required distance with respect to a spraying direction of the urethane material (U) by the spraying device (18). Urethane skin mold. The urethane material (U) is evacuated from the spraying direction of the urethane material (U) between the outer edge contour portion of the skin molding surface (12) and the inner edge contour portion of the receiving surface (14) to prevent spraying of the urethane material (U). The urethane skin mold according to claim 1 or 2, wherein a contour end face (24) to be formed is formed. The outer contour portion of the skin forming surface (12) is a flange-like protruding edge (26) extending at an acute angle upward from the receiving surface (14). The urethane skin mold of the description. A part of the urethane material (U) sprayed and applied to the skin forming surface (12) by extending a linear concave portion (30) near the inside along the outer edge contour portion of the skin forming surface (12). The thick portion (46) can be integrally extended along the terminal portion of the cured urethane skin (40) by allowing the urethane skin to stay and cure in the concave portion (30). Item 7. The urethane skin mold according to any one of Items 1 to 4.

Images