JPH085149B2 - Shoe sole mold - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to improvements in the shape of runners and gates of shoe sole molds, and improves gate clogging and poor filling that occur during the molding of multicolor shoe soles. However, when the shoe sole is released from the shoe sole mold, the gate traces on the shoe sole can be made minute without leaving the gate molding (the molding material is cooled and solidified in the gate, the same applies below) on the sole side. Regarding shoe sole mold.

[Conventional technology]

2. Description of the Related Art In recent years, a large number of shoes having a multicolor sole have been produced from the viewpoint of design and functional viewpoints such as an improvement in grip on the ground contact surface.

Conventionally, as a shoe sole mold used when molding such a multi-colored shoe sole by an injection method, an Otogary type as shown in FIGS. 3 (A) and 3 (B) is known.

FIG. 3 (A) is a vertical partial sectional view in the longitudinal direction of the Ottogary type shoe sole mold, and FIG. 3 (B) is a vertical partial sectional view in the width direction.

In the figures (A) and (B), a shoe sole mold 40 of the Otgarry type has a shoe sole design on a molding surface 41 at the upper portion thereof,
Two runners 42a, 42b having a circular cross section are bored in parallel from the heel side (nozzle side) toward the toe side.

Further, on the molding surface 41, at a desired plurality of locations directly above the runners 42a, 42b, gate portions 43 are vertically formed toward the runners 42a, 42b.

These gate portions 43 are formed by the runners 42a, 42 from the molding surface 41 side.
It is processed so as to have a shape in which a cylindrical groove is bored in two steps toward the b side, that is, a taper so as to have a stepped shape, or although not shown, it is processed into a conical shape with a taper.

When molding the shoe sole with the shoe sole mold 40, although not shown, first the molding material of the first color is injected into the cavity formed by the shoe sole mold 40 and the dummy mold to form the first shoe color of the shoe sole. Mold the part.

After that, the dummy mold is removed, each mold of the shoe sole mold, the last mold in which the cover is suspended, and the side mold are closed, and the second color molding material is placed in the cavity formed by these molds. Inject and
The second color portion of the shoe sole is stacked and molded on the first color portion.

In the case of the above-mentioned two-color sole, the thickness per one color of the sole, that is, the cavity thickness, is approximately 1/2 of the total thickness of the sole (generally 1 / (number of colors) in the case of multicolor soles). Therefore, it is necessary to increase the injection pressure to some extent in order to complete the filling. However, if the injection pressure is too high, it may cause damage to the shoe sole mold 40.Therefore, as described above, the gate portion is provided at a plurality of locations to disperse the injection locations, and the thinness of the cavity affects the effect. Has been relaxed.

[Problems to be Solved by the Invention]

By the way, since the gate portion 43 of the shoe sole mold 40 is bored from the molding surface 41 side toward the runners 42a, 42b, when the shoe sole is released from the shoe sole mold 40, the gate portion 43 is formed.
The gate molded body that has been cooled and solidified in 43 is cut, but the cut portion is not necessarily the boundary with the molding material that has been cooled and solidified in the runners 42a and 42b (hereinafter referred to as "runner molded body"). Not exclusively.

Therefore, as shown in FIG.
When 44 is cut in the middle of the gate portion 43, when the runner molded body 45 is pulled out, a part of the gate portion molded body 44 remains in the gate portion 43, which causes a gate jam, which may cause a defective filling. There is a problem of becoming.

Even when the gate molded body 44 is normally cut at the boundary with the runner molded body 45, the gate molded body 4 is attached to the shoe sole side. A step of cutting with pliers or the like is required. Since this cutting work must be done manually, it leads to a decrease in production efficiency and a rise in production cost. In addition, the above cutting marks remain on the sole of the shoe, which impairs the appearance and lowers the commercial value of the shoe itself. There is inconvenience.

Further, in the conventional shoe sole mold 40, as shown by the dotted line in FIG. 4 (B), the molding material is formed from a minute gate portion inlet 46 that opens in a dot shape on the inner surface on the runner 42a, 42b side.
Since it is poured into the cavity through the inside of 43, there is a disadvantage that the injection efficiency of the molding material is poor. In order to prevent this, it is sufficient to increase the injection pressure, but as mentioned above, since the injection pressure is originally high to some extent in the multicolor shoe sole mold, there is a limit to increasing the injection pressure, and the injection efficiency Badness cannot be improved.

Particularly, in the vicinity of the gate portion entrance 46, stress indicated by the solid arrow F in FIG. 3B is concentrated during injection molding, and the gate portion 43 is likely to be damaged. The pressure will be limited.

Therefore, it is necessary to provide a large number of gates 43 on the runners 42a and 42b, and as a result, more gate portion molded bodies 44 must be cut after the shoe sole is molded, and the cutting traces also increase with this cutting. Will be done.

In addition, in the conventional shoe sole mold 40 for molding a multicolor shoe sole, the runners 42a and 42b have to be bored in a straight line. Therefore, in many cases, the gate for injecting the molding material of a certain color cannot be arranged at a desired position of the shoe sole, and there is a problem that the design of the shoe sole design is limited.

The present invention has been made in order to solve the above problems, and prevents gate clogging and filling failure during molding of a multicolor shoe sole, and when releasing the shoe sole from the shoe sole mold. A shoe sole mold in which the gate traces on the shoe sole can be made minute without leaving the gate molding on the shoe sole side, and when the runner molding is pulled out, the gate molding is pulled out along with the runner molding. The purpose is to provide.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a shoe sole mold for forming a multi-colored shoe sole with a single shoe sole mold, wherein a pair of plates are integrated in upper and lower two stages, and an upper plate. The shoe sole design is formed on the molding surface side of the plate, and the number of the number of colors corresponding to the number of injection colors with an elliptical cross-section is tapered on the boundary surface side of both plate members in the direction from the injection port to the runner tip. A runner is provided, from the runner surface of the upper plate toward the molding surface, inclined forward with respect to the runner axial direction, and having a plurality of tapered cross sections in a direction away from the injection point, or an oval or A circular gate portion is provided, and the injection port side of the boundary portion of the gate with the runner is rounded.

[Operation] In the present invention, the runner provided on the boundary surface of the two plates is machined from the boundary surface side before the two plates are integrated. Such a runner has a taper in its width direction, and in consideration of the flow efficiency of the molding material and the ease of pulling out the runner compact, etc., a groove with a semi-elliptical cross section is drilled on both plates. When the two plates are integrated with each other, the runner has an elliptical cross section.

Further, a conical tapered gate portion from the runner surface side of the upper stage plate toward the molding surface, or a tapered gate portion having an elliptical cone shape or a stepped shape in which a cylindrical groove is drilled in several stages is used. A plurality of holes are formed inclining forward with respect to the axial direction. This gate portion is usually formed in an elliptical cone shape in consideration of the ease of pulling out the runner.

Then, the two plates provided with the runner and the gate portion are integrated to form the shoe sole mold of the present invention.

The two plates are usually integrated by using bolts or the like. When the two plates are integrated by bolts, the plates can be disassembled so that the runner and gate can be easily cleaned.

When the shoe sole is molded by the shoe sole mold of the present invention, the molding material from the injection machine flows toward the tip of the runner, reaches the gate portion, and is injected into the cavity from the tip of the gate portion.

At this time, the molding material is easily guided from the runner to the tapered gate portion and smoothly injected into the cavity from the tip of the gate.

At this time, the pressure from the injector is not concentrated at one point on the gate tip and is applied to the entire tapered side surface of the gate, so that excessive stress is not applied near the gate and the gate tip is not applied. No need to worry about damage in the vicinity.

Further, since the gate portion is provided to be inclined forward with respect to the runner axial direction, when the toe direction of the molding surface and the axial direction of the runner are aligned (generally, both directions are aligned), The molding material is completely filled even in the toe portion having a small cavity thickness.

Then, after the molding material is cooled and solidified, the shoe sole is released from the shoe sole mold. At this time, especially when the gate portion has a conical or elliptical cone shape, the sole and the molded gate portion are connected only at the tip of the gate portion, so the sole is a part of the molded gate portion. It is separated from the molded body of the gate portion without accompanying.

Moreover, since the diameter of the tip of the gate portion is extremely small, the cut marks of the gate portion molded body on the shoe sole are minute.

On the other hand, the runner molded body is pulled out in preparation for the next injection molding of the shoe sole. The runner has a taper with a small tip cross section, and the gate has a taper that is inclined in the direction opposite to the drawing direction, so that the molded body of the gate can be smoothly drawn into the runner, and the above extraction can be performed easily. Done. In particular, when the gate portion has an elliptical cone shape, the above-mentioned extraction is extremely easy.

Further, when the gate shape is an elliptical cone shape or a tapered shape such as a step shape in which a cylindrical groove is bored in several steps,
Even if the shoe sole is cut off with the part of the molded gate portion attached, the molded gate portion is not left behind in the gate portion.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 (A) is a plan view showing a case where the present invention is applied to an Otogaree type sole mold, and FIG. 1 (B) is a vertical sectional view in the α-α ′ direction shown in FIG. 1 (A). FIG. 7C is a vertical sectional view taken along the line β-β ′ shown in FIG.

In FIGS. 1B and 1C, the first shoe sole described below is used.
It shows the state of the colored part 11a after molding, and at the same time
Last mold 20 and side mold 30
Is also shown.

1A to 1C, the shoe sole mold 1 is composed of an upper plate 2 and a lower plate 3.
Although not shown, the upper plate 2 and the lower plate 3 are integrated by bolts or the like.

A molding surface 4 with a shoe sole design is provided on the upper surface of the upper plate 2, and at the boundary surface between the upper plate 2 and the lower plate 3, two runners 5a, 5b are directed from the heel side to the toe part. Is provided. Each of these runners 5a and 5b is tapered toward the tip.

As shown in FIGS. 1 (A) to (C), the cross section of the runners 5a, 5b is formed into a horizontally long elliptical shape by cutting a semi-elliptical groove in each of the plates 2 and 3, and The material injection efficiency and the pulling-out of the runner compact described later become extremely easy.

The upper plate 2 is provided with a plurality of gate portions 6a, 6b which are tapered from the runners 5a, 5b toward the molding surface 4 and are inclined forward with respect to the axes of the runners 5a, 5b.

In FIGS. 1B and 1C, the shape of the gate portions 6a and 6b is a horizontally long elliptical cone shape, but other various shapes such as a conical shape may be adopted. For example, a shape in which a cylindrical groove is drilled in several stages (that is, a stepped taper) may be used.
However, when the gate portion has a conical shape or a horizontally long elliptical cone shape, the shoe sole can be released without attaching a part of the molded gate portion to the shoe sole as described later. Also,
When the gate portion has a horizontally long elliptical cone shape, the gate portion can be easily pulled into the runner when pulling out the runner.

Further, in FIGS. 1A to 1C, the tip end portions P of the gate portions 6a and 6b are opened by the concave portions of the molding surface 4, but the shoe sole mold of the present invention has a high injection material injection efficiency. Therefore, the tip portion P may be opened at the convex portion of the molding surface 4.

Further, as shown in FIG. 1B, R is attached to the portions of the gate portions 6a, 6b close to the runners 5a, 5b near the heel portion, so that the runner can be pulled out more easily.

Since the runners 5a and 5b and the gate portions 6a and 6b can be processed before the upper plate 2 and the lower plate 3 are integrated with each other by bolts or the like, the inner surface treatment of the runners 5a and 5b and the above-mentioned R are performed. Processing such as attachment becomes easy.

Further, when the gate portions 6a, 6b are provided to be inclined forward and leftward with respect to the axes of the runners 5a, 5b, the drilling work is facilitated and the runners 5a, 5b can be provided by being bent. Becomes

When the gate portions 6a, 6b or the runners 5a, 5b are provided in this manner, the tip portions P of the gate portions 6a, 6b can be arranged at desired positions on the molding surface 4, so that a complicated design is often required. Colored soles can be molded.

Next, a manufacturing process of shoes using the shoe sole mold 1 will be described.

First, the shoe sole mold 1 and the dummy mold (not shown)
The first color portion 11a of the shoe sole is molded by and. This first color portion 11a is shown by the hatched portion in FIGS. 1 (B) and (C). Further, in order to make it easier to understand the state in which the first color portion 11a of the shoe sole is molded on the molding surface 4 of the shoe sole mold 1, the first color portion 11a is shown by hatching in FIG. 2 (A).

After molding the first color portion 11a, as shown in FIG.
As shown in (C), the last mold 20 in which the shoe sole mold 1, the cover 21 are suspended, and the side mold 30 are closed, and the second color part is formed by overlapping the first color part 11a. Two
Form a colored sole.

FIG. 2B is a partial cross-sectional view in the vicinity of the gate portion 6b, in which the second color portion 11b is formed so as to overlap the first color portion 11a,
The state where the shoe sole 11 is formed by the first color and second color portions 11a and 11b is shown.

After the second color portion 11b is cooled and solidified, the shoe sole mold 1,
The last mold 20 and side mold 30 are opened, and the shoe sole 11
From the shoe sole mold. At the time of this release, the second
As shown in FIG. (B), since the gate portion molded bodies 6a ′, 6b ′ cooled and solidified in the gate portions 6a, 6b and the shoe sole 11 are only connected at the tip end portions P of the gate portions 6a, 6b. (6a ′, 6a
(Not shown in FIG. 2B), when the shoe sole 11 is released from the shoe sole mold 1, the gate portion molded bodies 6a ', 6b' are cut at the tip portion P.

Therefore, at the same time as the mold release, the gate molded body 6 such as pliers
A shoe having a sole without a gate mark is manufactured without cutting a'and 6b '.

At this time, as shown in FIG. 2 (B), the runners 5a, 5b
Inside the runner compacts 5a ', 5
b'is formed (note that 6a'6a is shown in FIG. 2B).
Not represented).

The runner molded bodies 5a ', 5b' are pulled out from the injection port side, but since the runners 5a, 5b are tapered during the withdrawal, if a slight force is applied in the initial stage of the withdrawal, then the runners can be easily removed. Is pulled out.

Further, since the gate portions 6a and 6b are inclined in the direction opposite to the pulling-out direction, the gate portion molded bodies 6a ′ and 6b ′ are easily attached to the runner molded bodies 5a ′ and 5b ′, and the runner 5a, 5b
Since the runner compacts 5a 'and 5b' are pulled out, the runner compacts 5a 'and 5b' can be smoothly pulled out.

Particularly, as shown in FIGS. 1 (B) and (C), the gate portion
If 6a and 6b have an elliptical cone shape, the gate body 6
The drawing of the a ′ and 6b ′ into the runners 5a and 5b becomes easier and the drawing of the runner compacts 5a ′ and 5b ′ becomes smoother.

It should be noted that in the above embodiment, the Otogaree type shoe sole mold for molding a two-color shoe sole has been described, but the shoe sole mold of the present invention is, of course, not limited to the Otogarie type shoe sole mold for molding a shoe sole of three or more colors. It can also be applied to other types of shoe molds such as monochromatic shoe molds.

〔The invention's effect〕

In the shoe sole mold of the present invention, the shoe sole mold is constituted by the upper plate and the lower plate, and a runner is provided on the boundary surface between both plates, and a tapered gate portion is bored from the runner side toward the molding surface. .

Therefore, since the gate part has a conical or elliptical cone shape,
When the shoe sole and the shoe sole mold are released from each other, the gate molded body is always cut at the connecting portion with the shoe sole. The step of cutting by means of is unnecessary, and the cutting trace is also extremely small.

As a result, it is possible to improve the production efficiency of the shoe itself, reduce the production cost, and improve the commercial value by improving the appearance of the shoe sole.

Further, since the gate portion is provided so as to be inclined forward with respect to the runner axis, not only when the gate portion has a conical or elliptic cone taper shape, but also with a stepped shape in which a cylindrical groove is drilled in several stages. Even when the gate portion molded body is tapered, when the runner is pulled out, the gate portion molded body is pulled out together with the runner.

Therefore, neither gate clogging nor defective filling occurs.

Further, since the gate portion of the shoe sole mold of the present invention is bored from the runner side, the molding material can be easily introduced into the gate, and the molding material can be injected into the cavity with extremely high efficiency.

In addition, since the injection efficiency of the molding material is high, when molding a multi-colored shoe sole, it is not necessary to make the injection pressure as high as in the conventional shoe sole mold even if the cavity thickness is extremely thin.

Therefore, no stress is intensively applied to the tip of the gate portion, so that the gate portion is not damaged, and it is not necessary to increase the number of gates in order to disperse the injection pressure.

In addition, in the shoe sole mold of the present invention, since the runner can be provided by being bent, it is easy to arrange the gate at a desired position of the shoe sole in the case of multiple colors, so that the design of the shoe sole is designed. Can be expanded, and the appearance value and functional value can be increased.

Furthermore, when the upper plate and the lower plate are integrated with bolts, the runner and the gate can be easily cleaned because they are easily disassembled.

[Brief description of drawings]

1 (A) to 1 (C) are explanatory views showing one embodiment of the shoe sole mold of the present invention, FIG. 1 (A) is a plan view of the shoe sole mold, and FIG. 1 (B) is the same as the longitudinal direction. FIG. 2C is a vertical sectional view of the same in the width direction, FIG. 2A is a plan view of a shoe sole mold in which the first color portion of the shoe sole is molded, and FIG. Sectional drawing which shows the gate part vicinity after the 1st color part and 2nd color part of the shoe sole were shape | molded, FIG. 3 (A) is a longitudinal vertical partial sectional view of the conventional shoe sole mold. )
Is also a vertical partial cross-sectional view in the width direction, and FIG. 4 (A) is a vertical partial cross-sectional view showing a state in which the molded gate portion is cut in the middle of the gate in the conventional shoe sole mold, FIG.
FIG. 8 is a vertical partial sectional view showing a flow state of a molding material in a conventional shoe sole mold at a gate portion. 1 …… Shoe sole mold, 2 …… Upper plate 3 …… Lower plate, 4 …… Molding surface 5a, 5b …… Runner, 6a, 6b …… Gate part

Claims (1)

[Claims] 1. A shoe sole mold for forming a multi-colored shoe sole with a single shoe sole mold, wherein a pair of plates are integrated in upper and lower two stages, and the shoe sole is formed on the molding surface side of the upper plate. The design is formed, and on the boundary surface side of both plate members, the number of runners tapered in the direction from the ejection port to the tip of the runner and having a cross-sectional shape of an ellipse according to the number of emission colors is provided. A plurality of gate portions having an elliptical or circular cross section, which are inclined from the runner surface of the plate toward the molding surface and which are inclined forward with respect to the axial direction of the runner, and which are tapered in a direction away from the injection point, are provided. A shoe bottom mold for a multicolor shoe sole, wherein the injection port side of a boundary portion of the gate with the runner is rounded.