JP5515335B2 - Molding method and mold - Google Patents

Description

  The present invention relates to a molding method and a mold, and more particularly, to a molding method and a mold for molding a resinous molded article having an undercut portion.

  2. Description of the Related Art Conventionally, as a manufacturing method for vehicle interior members, furniture, etc., a skin and a base material (also referred to as a core material) constituting the appearance of a product are provided in a cavity of a foaming mold with a gap, and the gap is provided in this gap. A method of filling a foam and creating a foam molded body has been performed (see, for example, Patent Document 1). In the method described in Patent Document 1, a part of a molded product interferes with the inner surface of the mold at the time of demolding, and the molded product having an undercut portion that prevents demolding is slid into the mold. Possible nesting is provided. The insert is slid away from the undercut portion before removing the molded product from the mold.

JP 2008-119995 A

  In order to perform automatic mold release with the mold described in Patent Document 1 described above, a separate drive source is required to slide the insert separately from the drive source used for mold release.

  The present invention has been made in order to solve the problems associated with the above-described prior art, and a molding method and mold capable of easily demolding a molded product having an undercut portion without the need to provide a separate drive source. The purpose is to provide.

The molding method according to the present invention that achieves the above object is a molding method for molding a molded product having an undercut portion using a first mold and a second mold that are relatively close to each other. In the molding method, a slide member having an undercut molding surface connected to the first mold or the second mold and engaged with the undercut portion is moved from the undercut portion of the molded product to the first mold or the molded product. While receiving the force in the mold release direction from the second mold, the mold is moved in one direction which is the mold release direction and the release direction in which the undercut molding surface is separated from the undercut part, and further, the slide member the receiving surface of the concave portion or the convex shape is formed, by forming a pressing portion of the projections or recesses shaped from the undercut portion of the molded article at a position away along the demolding direction, the said shaped article when causing demolded from the first mold or the second mold, with pressing the undercut surface by the undercut portion, the slide to press the receiving surface by the pressing portion To move the wood.

The forming die according to the present invention that achieves the above object is a forming die for forming a formed product having a first die and a second die that are relatively close to each other and having an undercut portion. The molding die includes a slide member having an undercut molding surface connected to the first die or the second die and engaged with the undercut portion, and the slide member is the first die or the molded product. It is movable in one direction, which is a releasing direction from the second mold and is a detaching direction in which the undercut forming surface is separated from the undercut portion, and the slide member has a concave or convex shape. the receiving surface of the formation, the receiving surface, the molding the pressing portion of the projections or recesses shaped from the undercut portion of the molded article at a position away along the demolding direction, the said moldings first When removing from the first mold or the second mold, the undercut portion presses the undercut molding surface, and the pressing portion presses the receiving surface to move the slide member.

  In the molding method according to the present invention configured as described above, a force in the demolding direction is applied to the slide member that is movable in one direction which is the demolding direction and the detachment direction, and the slide member is moved in the detachment direction. The molded product having the undercut portion can be easily demolded without providing a separate drive source for moving the slide member.

  In the molding die according to the present invention configured as described above, since the slide member can move in one direction which is the demolding direction and the detachment direction, when a force in the demolding direction acts on the slide member, the slide member Also moves in the direction of withdrawal. Therefore, it is possible to easily remove the molded product having the undercut portion without providing a separate drive source for moving the slide member.

It is a perspective view which shows the instrument panel as an example of a molded article. It is a fragmentary sectional view which follows the AA line of FIG. It is a schematic sectional drawing which shows the time of removing a molded article from a cavity type | mold. It is a fragmentary sectional view which shows before demolding a molded article from a cavity type | mold in 1st Embodiment. It is a fragmentary sectional view which shows the process of demolding a molded article from a cavity type | mold in 1st Embodiment. It is a fragmentary sectional view which shows the process of demolding a molded article from a cavity type | mold in 1st Embodiment. It is a fragmentary sectional view which shows after removing a molded article from a cavity type | mold in 1st Embodiment. It is a fragmentary sectional view showing the modification of a slide member. It is a fragmentary sectional view showing other modifications of a slide member. It is a fragmentary sectional view showing before opening a mold in a 2nd embodiment. It is a fragmentary sectional view which shows the process of opening a shaping | molding die in 2nd Embodiment. It is a fragmentary sectional view which shows after opening a shaping | molding die in 2nd Embodiment.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In addition, the dimension ratio of drawing may be exaggerated on account of description.

<First Embodiment>
FIG. 1 is a perspective view showing an instrument panel as an example of a molded product, FIG. 2 is a partial cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a diagram when the molded product is removed from the cavity mold. It is a schematic sectional drawing shown.

  A molding die 10 according to the present invention is an apparatus that molds a skin 2 of a vehicle instrument panel 1 (see FIGS. 1 and 2) as a molded product, for example. The instrument panel 1 is a foam-molded member in which a foam 4 is filled between a skin 2 constituting an external appearance and a base material 3 serving as a back surface.

  A ventilator opening 5 is formed in the instrument panel 1 as shown in FIG. 2, and a hook fitting portion 8 for attaching a hook 7 of a ventilator 6, which is a separate component, to the edge of the ventilator opening 5. Is formed. The hook fitting portion 8 is an undercut portion 8 that is formed on the skin 2 and interferes with the inner surface of the mold when the skin 2 is molded after the molding 2 is molded, thereby preventing the mold from being removed.

  The skin 2 is made of a synthetic resin, and for example, a urethane-based synthetic resin raw material can be applied. For the substrate 3, plastic, metal, or the like can be applied.

  The foam 4 can be filled in the space between the skin 2 and the substrate 3 by injecting a foam material such as a polyurethane material between the skin 2 and the substrate 3 and foaming. At that time, the foam is integrated with the skin 2 and the base material 3 by its own adhesiveness to form a foam-formed member with a skin.

  As shown in FIG. 3, the mold 10 has a cavity mold 11 (first mold) having a recessed molding surface and a core mold (second mold, not shown) having a protruding molding surface. ing. The molded product 2 (skin) molded between the cavity mold 11 and the core mold remains in the cavity mold 11 after the core mold is detached from the cavity mold 11 and is taken out by the molded product taking-out means 12 automated by the robot. . In the molded product 2, ribs 9 are molded on the side opposite to the appearance of the product (core mold side). The molded product 2 can be removed from the cavity mold 11 by sandwiching and retracting the rib 9 by the chuck mechanism 14 provided in the molded product taking-out means 12.

  FIG. 4 is a partial cross-sectional view showing the molded product before demolding from the cavity mold in the first embodiment, FIG. 5 is a partial cross-sectional view showing the process of demolding the molded product from the cavity mold, and FIG. FIG. 7 is a partial cross-sectional view showing the process after the molded product is removed from the cavity mold. FIG.

  As shown in FIG. 4, the mold 10 according to the first embodiment includes a slide member 15 connected to the cavity mold 11. The slide member 15 is disposed at a position corresponding to the undercut portion 8 of the molded product 2 and has an undercut molding surface 16 protruding in a shape corresponding to the undercut portion 8.

  The slide member 15 is in the direction in which the molded product 2 is removed (see arrow B in FIG. 4; hereinafter referred to as the removal direction), and the direction in which the undercut molding surface 16 is separated from the undercut portion 8 (see FIG. 4 is referred to as an arrow C in FIG. 4 (hereinafter referred to as a detaching direction), and is slidably connected to the cavity mold 11. That is, the slide member 15 is fixed to the slide shaft 18 inserted in the slide hole 17 formed in the cavity mold 11 and can move in one direction along the slide hole 17.

  The slide member 15 is formed with a receiving surface 20 for forming a pressing portion 19 having a shape protruding from the molded product 2. The pressing part 19 has a shape in which the tip becomes thinner toward the demolding direction.

  Next, the operation of the mold 10 according to the first embodiment will be described.

First, after the skin is molded as the molded product 2 using the cavity mold 11 and the core mold, the core mold is separated from the cavity mold 11 and opened. Thereafter, as shown in FIG. 3 , the rib 9 of the molded product 2 remaining in the cavity mold 11 is gripped by the chuck mechanism 14 of the automated molded product takeout means 12, and the molded product takeout means 12 is moved backward. The molded product 2 is removed from the cavity mold 11.

  During this demolding, the pressing portion 19 of the molded product 2 presses the receiving surface 20 of the slide member 15 in the demolding direction. That is, in this embodiment, the demolding direction coincides with the pressing direction. As a result, as shown in FIGS. 5 and 6, the undercut molding surface 16 gradually separates from the undercut portion 8 while the slide member 15 slides and moves toward the demolding direction (pressing direction). Further, when the molded product 2 is retracted by the molded product take-out means 12, the undercut molding surface 16 is completely detached from the undercut portion 8 as shown in FIG. It is easily demolded without any problems.

  FIG. 8 is a partial cross-sectional view showing a modification of the slide member, and FIG. 9 is a partial cross-sectional view showing another modification of the slide member.

  The shape of the receiving surface of the slide member 15 is not particularly limited as long as it can receive a force from the pressing portion of the molded product 2. For example, as shown in FIG. 8, the receiving surface 21 and the pressing portion 22 are formed toward the opposite side of the demolding direction, or the receiving surface 23 and the pressing portion 24 are orthogonal to the demolding direction as shown in FIG. It may be formed toward. Moreover, the pressing parts 19, 22, and 24 do not necessarily have a shape in which the tip is thinned.

  According to the present embodiment, the slide member 15 connected to the cavity mold 11 can move in one direction which is the demolding direction (pressing direction) and the detaching direction, so the slide member 15 exerts a force in the demolding direction. If it receives, the slide member 15 will also move to a detachment | leave direction. In this embodiment, when the molded product 2 is removed from the mold, the slide member 15 receives a force from the molded product 2 to move in the removal direction and the removal direction. Therefore, there is no need to provide a dedicated drive source for moving the slide member 15 in addition to the drive source for the molded product take-out means 12 used for demolding, and the molded product 2 having the undercut portion 8 can be manufactured at low cost. It can be easily demolded.

Further, the formed molded article 2 in which released from the cavity mold 11, for moving the slide member to press the receiving surface 20 by the pressing portion 19, to move the molded article 2 having an undercut portion 8 efficiently Can do.

  In addition, since the receiving surface 20 is formed as a concave portion such that the tip of the pressing portion 19 to be molded becomes thinner in the direction of demolding, the pressing portion 19 is removed from the receiving surface 20 at the time of demolding. It becomes easy to come out and the molded product 2 can be easily removed.

Second Embodiment
FIG. 10 is a partial cross-sectional view showing the mold before the mold is opened in the second embodiment, FIG. 11 is a partial cross-sectional view showing the process of opening the mold, and FIG. 12 is the mold open. It is a fragmentary sectional view which shows after having performed. In addition, about the site | part which has the same function as 1st Embodiment, the same code | symbol is used and in order to avoid duplication, the description is abbreviate | omitted.

  As shown in FIG. 10, the molding die 30 according to the second embodiment is in the mold releasing direction of the molded product 2 and the undercut molding surface 16 is separated from the undercut portion 8, as in the first embodiment. A slide member 31 connected to the cavity mold 11 is slidable in the direction.

  The slide member 31 is further connected to the core mold 32 by a slide holding portion 33.

  The slide holding portion 33 is a hook-like member that is rotatably connected to the core die 32, and is an engagement that is a recess formed in the slide member 31 in a state where the cavity die 11 and the core die 32 are clamped. Engage with the part 34 so as to be caught. When the slide holding portion 33 rotates and engages with the engaging portion 34, the core mold 32 and the slide member 31 are connected to each other, and when the slide holding portion 33 rotates and disengages from the engaging portion 34, the core The mold 32 and the slide member 31 are separated from each other.

  Next, the operation of the mold 30 according to the second embodiment will be described.

  First, the skin is molded as the molded product 2 by the cavity mold 11 and the core mold 32, and the core mold 32 is separated from the cavity mold 11 and opened.

  When the mold is opened, the slide holding part 33 moves backward together with the core mold 32, and the slide holding part 33 pulls the slide member 31 in the mold opening direction, and a force in the mold opening direction acts on the slide holding part 33. To do. That is, in this embodiment, the mold opening direction coincides with the pressing direction for pressing the slide member 31. As a result, the slide member 31 connected to the cavity mold 11 so as to be slidable in one direction moves in the mold opening direction (see arrow D in FIG. 11) and moves in the release direction (see FIG. 11). Move to arrow C).

  When the slide member 31 moves, the slide member 31 is gradually separated from the core mold 32, and the slide holding portion 33 is gradually removed from the engaging portion. Therefore, the shapes of the slide holding portion 33 and the engaging portion 34 need to be set so that the slide holding portion 33 gradually comes out of the engaging portion 34 when the slide member 31 is separated from the core mold 32. Moreover, the slide holding part 33 may be urged by a spring or the like. Further, the slide holding unit 33 does not necessarily have a structure that rotates.

  When the core mold 32 is further retracted, the slide holding portion 33 is completely detached from the engaging portion 34 after the undercut molding surface 16 is completely separated from the undercut portion 8. Thereby, the connection between the core mold 32 and the slide member 31 is released.

Thereafter, when the molded product 2 is pulled out by the molded product take-out means 12, the undercut molding surface 16 has already detached from the undercut portion 8. Demolded. Depending on the shape of the formed molded article 2, by the movement of the slide member 31 by mold opening, there may be the case also complete the demolding of the formed molded article 2.

  According to the present embodiment, since the slide member 31 is connected so as to move in synchronization with the core mold that is separated from the molded product by the mold opening of the mold 30, the force of the mold opening is used. The slide member 31 can be moved. At this time, since the slide member 31 can move in one direction which is the mold opening direction (pressing direction) and the separation direction, when the slide member 31 receives a force in the mold opening direction, the slide member 31 also moves in the separation direction. Moving. Therefore, it is not necessary to provide a dedicated drive source for moving the slide member 15, and the molded product 2 having the undercut portion 8 can be easily removed at low cost.

  The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims. For example, in the first embodiment, the pressing portion 19 is formed in a convex shape and the receiving surface 20 is formed in a concave shape, but the pressing portion 19 is formed in a concave shape and the receiving surface 20 is in a convex shape. It may be formed. Moreover, although the press part 19 is formed in the edge part of the molded article 2, you may form in the middle of the molded article 2 instead of an edge part. The undercut portion 8 may function as a pressing portion that presses the slide member 15, and the undercut molding surface 16 may function as a receiving surface that receives force.

  In addition, in the mold in which the molded product remains in the core mold instead of the cavity mold by the mold opening, the slide member is slidably connected to the core mold so that the molded product can be removed from the core mold. Also good.

2 Molded products (skin),
8 Undercut part (hook fitting part),
10,30 mold,
11 Cavity mold (first mold),
15, 31 slide member,
16 Undercut molding surface,
19, 22, 24 pressing part,
20 Reception surface,
31 slide member,
32 core type (second type),
33 Slide holder,
34 engaging portion,
B Demolding direction (pressing direction),
C direction of withdrawal,
D type opening direction (pressing direction).

Claims (3)

A molding method for molding a molded article having an undercut portion using a first mold and a second mold that are relatively close to each other,
The sliding member having a undercut surface to be engaged with the undercut portion is connected to the first type or the second type, the first type of the molded article from the undercut portion of the molded product or the While receiving a force in the mold release direction from the mold 2, the mold is moved in one direction which is the mold release direction and the release direction in which the undercut molding surface is separated from the undercut portion, and further, the slide member the receiving surface of the concave portion or the convex shape is formed, by forming a pressing portion of the projections or recesses shaped from the undercut portion of the molded article at a position away along the demolding direction, the said shaped article when causing demolded from the first mold or the second mold, with pressing the undercut surface by the undercut portion, the slide to press the receiving surface by the pressing portion Molding method of moving a de member. A molding die for molding a molded product having a first mold and a second mold that are relatively close to each other and having an undercut portion,
A slide member having an undercut molding surface connected to the first mold or the second mold and engaged with the undercut portion, wherein the slide member is the first mold or the second mold of the molded product; The slide member is movable in one direction which is a release direction from which the undercut molding surface is separated from the undercut portion, and the slide member has a concave or convex receiving surface. There is formed, the receiving surface, said along the demolding direction from the undercut portion of the molded article by molding the pressing portion of the projections or recesses shaped away, the molded article of the first type or A molding die in which the undercut portion presses the undercut molding surface when the mold is released from the second mold , and the pressing portion presses the receiving surface to move the slide member. The said receiving surface is a shaping | molding die of Claim 2 formed with the recessed part engaged in the shape where the front-end | tip of the said press part of the said molded article shape | molded becomes thin toward the said mold release direction.

Images