JPH11286061A - Mold for molding shoe sole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mold a beautiful sole by a method in which in a mold for molding a sole comprising a shoe mold for molding a sole integrally with a carapace, a side mold, and a bottom mold, the manufacturing cost and time are curtailed, the durability of the side mold to be used for a long period, is enhanced and the generation of split lines in the toe part of the sole is prevented. SOLUTION: The side mold 2 of a mold comprising a shoe mold, the side mold 2, and a bottom mold 3 is made the layer structure of a polyurethane resin and a resin for a laminated packing, holes 9 and notches 10 are formed in the toe part of the first layer, and when the mold is opened/closed to right and left, the application of excessive stress to an opening/closing part is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shoe sole molding die, and more particularly, to a shoe sole molding die made of a foamed polyurethane resin. The present invention relates to a mold that allows only the heel to be opened and closed right and left.

[0002]

2. Description of the Related Art Conventionally, a mold for molding a shoe sole integrally with an upper by injecting or casting a resin is an aluminum mold composed of three molds: a shoe mold, a horizontal mold, and a sole mold. Molds are often used. The horizontal type is divided into two parts, right and left, from the middle to remove the molded shoes after molding the soles,
There are many dies that can be opened and closed by sliding left and right. Other casting molds include a shoe mold, an upper mold (horizontal mold), and a lower mold (bottom mold), and only the toe side or the heel side of the upper mold can be opened and closed right and left.

[0003]

The mold manufactured by the above-described structure, especially the mold for injection molding, requires a large amount of labor and a long date and time to manufacture, and furthermore, requires complicated designs and shapes. What they have is difficult to machine, requires hand carving and hand finishing, and requires years of experience and skill. Therefore, there is a problem in terms of the number of days for manufacturing the mold and the cost when manufacturing shoes having a trendy design with a short cycle life. In addition, since the horizontal mold is divided into left and right two-side molds, streaks corresponding to the joints are formed on the toe and the heel of the shoe sole after molding, which impairs the appearance of the finished product.

In order to solve these problems, there are a mold made of urethane resin and a mold made of a mold made of urethane resin with a metal frame except for a shoe mold. This mold is mainly used for molding shoe soles by casting foamed polyurethane resin. The upper die (horizontal type) of this type is devised so that the streaks protrude only at either the toe portion or the heel portion, and is manufactured so as to be able to open and close left and right around either portion. However, while opening and closing are repeated during production, excessive stress is applied to the shaft portion, and the shaft portion is broken and the life is short.

[0005] Further, as a mold having no streaks, Japanese Patent Laid-Open No.
No. 6-121501 and Japanese Patent No. 2588614 (Japanese Patent Application Laid-Open No. 6-335403). However, these dies are injection molding dies, and have many manufacturing problems as described above. The present invention has been made in order to solve these problems in production, in terms of strength, and in addition, problems such as streaking of the product due to streaks.

[0006]

[Means for Solving the Problems] In a mold for casting a foamed polyurethane resin into a sole mold, assembling a shoe mold with an upper and a horizontal mold, and forming a shoe sole integrally with the upper, In a mold that can be opened and closed only on the heel side of the horizontal type, the first layer on the lower side of the horizontal type has a two-layer structure in which the second layer on the upper surface is a resin for laminate packing, and the lower polyurethane resin, that is, A mold provided with a hole and a cut in the toe of the first layer.

[0007]

[Effect] Only the horizontal heel side can be opened and closed left and right, the first layer of the lower surface of the mold is made of polyurethane resin, the second layer of the upper surface is made of a laminate packing resin, and the lower surface of the lower surface is formed. By making a cut in the toe portion of the polyurethane resin, that is, the first layer, excessive stress does not act on the open / close portion even during repeated opening / closing during production.

[0008]

Embodiments will be described below with reference to embodiments. The shoe sole forming mold (1) produced this time is composed of a horizontal mold (2) formed into a split mold as shown in Fig. 1 and a sole mold (3) formed integrally with the upper and lower via a hinge (11). It is a butterfly that can be opened and closed freely.
As shown in FIG. 2, the horizontal type (2) has a steel outer frame (12) surrounding four circumferences, and a first layer (7) on the lower surface has a lip (13) formed using polyurethane resin. The layer (8) is a resin molded article (14) having a two-layer structure which is made strong by using a resin for laminate packing. The lip portion (13) of the first layer (7) is formed so as to follow the shape of the outer peripheral surface of the upper attached to the last (4), and the outer frame (12).
As shown in FIG. 1, guide recesses (15) are provided inside the resin mold (14) at four corners, and an opening / closing bracket (16) and a mold clamp (17) are fixed to the outer frame (12). It is.

The bottom mold (3) is a resin molded product (1) in which a shoe product is used as a master model (18) and a resin for laminating packing is injected and solidified in an outer frame (12) made of iron or the like surrounding four circumferences.
4) is fixed, and the inner surface of the resin molded body (14) is formed with a shoe sole cavity (19) conforming to the shape of the shoe sole outer peripheral surface. An outer frame (12) made of iron or the like surrounding the four circumferences of the bottom mold (3)
In the four corners, there are recesses (15) made on the horizontal type (2), respectively.
A projecting piece (20) that can be fitted into the outer frame (12) is provided on both sides of the bottom mold (2) and the outer frame (12), as shown in FIG. Metal fittings (21)
Release the metal fittings (22) for pressing the upper surface of the mouth part of the plastic or wooden shoe last (4) to which the upper is attached, and release the horizontal mold (2) to the bottom mold (2) and the outer frame (12). When you do
The receiving member (23) for supporting the horizontal die (2) is fixedly attached.

The method of forming the horizontal mold (2) and the bottom mold (3) will now be described in more detail. First, using a plastics or wooden last (4), a master model (18) of the same shoe as when the upper was attached was produced, and the horizontal type (2) and the bottom type (3) were divided. Decide the surface (24) and draw a score line. According to the split surface (24), an iron outer frame (12) of a horizontal type (2) and a bottom type (3) is manufactured. At that time, the hinge (11) is attached to the outer frame (12).
Processing such as screw holes for attaching the other fittings described above is performed.

Next, the inner surface of the outer frame (12) for the bottom mold (3) is subjected to a release treatment, and the oil clay (25) is packed therein, and the shoe master model (18) is placed in the oil clay (25). ) Is also subjected to release processing, and the score line (26) applied to the master model (18)
Then, the unnecessary oil clay (25) above the dividing line (26) is removed. At that time, oil clay (25)
A round bar having a diameter of 6 mm is erected at a position about 15 mm away from the center of the toe, and a thin plate of stainless steel of 0.06 mm is erected from the part along the shoe model. The height of the round bar and the stainless steel plate is the thickness of the polyurethane resin to be poured later.

Thereafter, the outer frame (12) for the horizontal mold (2) is placed on the outer frame (12) for the bottom mold (3) and temporarily fixed, and the low-temperature-curable polyurethane resin (27) is appropriately removed. Pour into the thickness (the height of the stainless steel plate), the first layer of the horizontal type (2) (7)
Molded lower surface. A resin (28) for laminating packing is poured as a backing material thereon to give strength, and the upper surface of the second layer (8) is formed, thereby forming a resin molded body (2) as a horizontal mold (2) having a two-layer structure. 14) (see FIG. 3). Next, the oil clay (25) is removed neatly (see FIG. 4).
8) Pour resin molding (14) as bottom mold (3)
Is molded.

As described above, in both the horizontal mold (2) and the bottom mold (3), the resin molding (14) is formed integrally with the outer frame (12).

[0008]

[0009] The metal fittings described in the above section are mounted to complete the shoe sole forming die (1). The shoe sole forming mold (1)
As shown in FIG. 1, the horizontal type (2) can be opened and closed up and down, and the heel (6) can be opened and closed left and right by the opening and closing shaft (29) of the toe (see FIG. 1). At this time, the holes (9) and the cuts (10) (see FIG. 1) provided in the room-temperature-curable polyurethane resin (27) of the first layer (7) when molding the horizontal (2) resin molded body (14) are formed. It is easy to open and close by acting, and no excessive stress acts on this part.

[0014] The resin used in this embodiment is as follows.
The polyurethane resin used for the horizontal type (2) has a tensile strength of 70 to 85 kg / cm ² and a tear strength of 45 to 5 after curing.
Room temperature-curable polyurethane resin (27), trade name: Flexan 80, for 5 kg / cm and elongation of 345-355%
L was used. The curing agent is also Flexan H80L
And the mixing ratio is 100: 25 to 35 by weight.
And The resin temperature is approximately 20 to 30 ° C. at room temperature, and the resin is cured in 2 to 3 hours.

As the resin (28) for laminating packing, use is made of a mixture of an epoxy resin and high-purity aluminum powder, which is a heat-resistant resin which is hardened at room temperature or relatively low temperature, and is a trade name of Devcon JF23. HB is used, and the mixing ratio is 100: 7 to 15 by weight.
The resin temperature at the time of molding is set to 20 to 30 ° C., and the resin is cured for 2 to 3 hours.
-100, and a tensile strength of 400-450 kg / cm ² .

[0016]

The effects of the present invention as described above can be obtained by using a master model system, even if the product has a complicated design or shape that is difficult to machine, so that it requires a large amount of labor and a long date and time. Does not require Therefore, the production cost is low. In addition, hand carving, hand finishing, etc. are unnecessary (not at all) and can be easily manufactured even if the experience is inexperienced. The greatest effect is that since the horizontal die is provided with holes and cuts, when opening and closing the mold left and right, no excessive stress acts on the opening and closing part, and the life of the mold is long.

[Brief description of the drawings]

FIG. 1 is a view of a horizontal type and a bottom type opened and closed.

FIG. 2 is a diagram in which a master model of oily shoes is fixed to soil.

FIG. 3 is a horizontal molding view.

FIG. 4 is a molding view of a bottom mold (a view before removing an oil clay and injecting a metallic putty).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mold for shoe sole molding 2 Horizontal mold 3 Bottom mold 4 Shoe mold 6 Heel part 7 First layer 8 Second layer 9 Hole 10 Notch 11 Hinge 12 Outer frame 13 Lip part 14 Resin molding 15 Concave part 16 Opening / closing fitting 17 Mold fastening Metal fittings 18 Master model 19 Sole cavity 20 Protrusions 21 Metal fittings 22 Pressing metal fittings 23 Receiving tools (not shown) 24 Split face 25 Oil clay 26 Splitting line 27 Room temperature curing type polyurethane resin 28 Laminate packing resin 29 Open / close axis

Claims (2)

[Claims] 1. A foamed polyurethane resin is cast into a sole mold (3), a shoe mold (4) with an upper is mounted and a horizontal mold (2), and a shoe sole is formed integrally with the upper. In the shoe sole forming die (1), in the horizontal type (2) in which only the heel (6) side of the horizontal type (2) can be opened and closed right and left, the first layer (7) on the lower surface of the horizontal type (2) is removed. A hole (9) and a cut (10) were formed in the polyurethane resin on the lower surface, that is, the toe portion of the first layer (7), using a polyurethane resin and the second layer (8) on the upper surface as a resin for laminate packing. A shoe sole molding die (1), characterized in that: 2. The horizontal mold according to claim 1, wherein the properties of the polyurethane resin used for the first layer of the lower surface after curing are as follows: a tensile strength of 70 to 85 kg / cm ² and a tear strength of 45 to 55.
kg / cm and an elongation percentage of 345-355%.