JP7200464B1 - Punching die for resin molding - Google Patents

Abstract

An object of the present invention is to provide a die for punching a resin molding that can suppress deformation such as gouging in a molded body after punching. A resin molded body punching die 10 is a resin molded body punching die for pressing a synthetic resin foam material to produce a molded body, and has a cutting blade 11 for cutting the synthetic resin foam material. A base portion 17, a second base portion 27 that suppresses deformation of the synthetic resin foam material in a direction other than the pressing direction when pressed, and a third base portion 28 that moves in the pressing direction with respect to the cutting blade 11 when the synthetic resin foam material is pressed. In preparation, a molded body is created from a synthetic resin foam material. [Selection drawing] Fig. 2

Description

TECHNICAL FIELD The present invention relates to a resin molding punching die for manufacturing a molding from a synthetic resin foam material by punching.

When a molding is produced from a synthetic resin foam material by punching, a punching die is often used for punching molding (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2001-179698

However, even if an attempt is made to mold a columnar member or a cylindrical member from a thick synthetic resin foam material using the conventional punching die described above, there is a case where the side surface of the molded body is gouged and deformed due to the compressive force at the time of punching. There is

SUMMARY OF THE INVENTION It is an object of the present invention to provide a punching die for a resin molding that can suppress deformation such as gouging in a molded body after punching.

In order to solve the above problems, the present invention employs the following means.
A resin molded body punching die according to the present invention is a resin molded body punching die for pressing a synthetic resin foam material to produce a molded body, and is provided with a cutting blade for cutting the synthetic resin foam material. a first base portion, a second base portion that does not deform when pressed and into which the cutting blade and at least a portion of the first base portion are inserted and that suppresses deformation of the synthetic resin foam material in a direction other than the pressing direction; and a third base that is connected in the pressing direction and moves while contracting in the pressing direction with respect to the cutting blade when the synthetic resin foam material is pressed.

In addition, the resin molded product punching die according to the present invention includes a deformable portion that is arranged around the cutting blade and that can be contracted and deformed by pressing, and a tip that has a height difference with respect to the tip position of the cutting blade. and a stepped portion.

Further, in the resin molded product punching die according to the present invention, the stepped portion includes a first stepped portion lower than the tip of the cutting blade and a second stepped portion higher than the tip of the cutting blade.

Further, in the resin molded body punching die according to the present invention, the deformable portion is made of a material harder than the synthetic resin foam material, and the third base portion can contract before the deformable portion when pressed.

According to the present invention, it is possible to suppress the occurrence of gouging or the like in the molded body after punching.

BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows the resin molded object punching die which concerns on the 1st Embodiment of this invention. FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1; 1 is a perspective view showing a cylindrical body molded from a synthetic resin foam material by a resin molded body punching die according to the first embodiment of the present invention; FIG. FIG. 5 is a plan view showing a punching die for a resin molded body according to a second embodiment of the present invention; FIG. 5 is a cross-sectional view taken along line VV of FIG. 4;

(First embodiment)
A first embodiment according to the present invention will be described with reference to FIGS. 1 to 3. FIG.
The resin molded body punching die 10 according to this embodiment uses a pressing machine (not shown) to press a plurality of cylindrical bodies (molded bodies) CY having a central axis line C from a rectangular parallelepiped synthetic resin foam material P such as a polyurethane foam material. A punching die for a resin molded body for manufacturing, which has a cutting blade 11 on which one synthetic resin foam material P is placed and which cuts four cylindrical bodies CY from one synthetic resin foam material P at once. A first mold 12, a second mold 13 having a through hole (hole) 13a into which the synthetic resin foam material P is inserted, a first mold 12 in a direction other than the pressing direction when the synthetic resin foam material P is pressed, and and an engaging portion 15 that suppresses relative movement with the second die 13 .

In the first mold 12, a cylindrical cutting blade 11 having a central axis C1 coinciding with the central axis C of the cylindrical body CY and a peripheral cutting edge 16 surrounding the cutting blade 11 are erected at substantially the same height. A base portion 17, a deformable portion 18 that is harder than a synthetic resin foam material and can be contracted by pressing, and a stepped portion 20 provided with a height difference with respect to the tip position of the cutting blade 11 as it separates from the central axis C1. Prepare. The first base portion 17 is made of wood such as veneer, metal, or the like, and is formed to have a predetermined thickness.

The cutting edge 11 includes an inner edge 21 for shaping the inner side of the cylindrical body CY and an outer edge 22 for shaping the outer side of the cylindrical body CY. A plurality of pairs of one inner cutting edge 21 and one outer cutting edge 22 sharing the central axis C<b>1 are arranged on the first base portion 17 . The deformable portion 18 is made of, for example, a rubber material harder than the synthetic resin foam material P, and is laminated on the upper portion of the first base portion 17 except between the inner blade 21 and the outer blade 22 .

The step portion 20 includes a first step portion 23 arranged between the inner cutting edge 21 and the outer cutting edge 22, and a second step portion 23 disposed between the inner cutting edge 21 and the outer cutting edge 22 and the outer cutting edge 16. A stepped portion 25 and a third stepped portion 26 arranged outside the peripheral cutting edge 16 are provided. The second stepped portion 25 and the third stepped portion 26 are layered on top of the deformation portion 18 . The stepped portion 20 is made of wood such as veneer, metal, or the like.

The first stepped portion 23 is formed with a predetermined thickness so as to be lower than the tip of the cutting blade 11 and laminated on the first base portion 17 . The second stepped portion 25 is formed to have a predetermined thickness so as to protrude higher than the tip of the cutting blade 11 when stacked on the deformed portion 18 . The third stepped portion 26 is formed with a predetermined thickness so as to protrude higher than the second stepped portion 25 .

The second mold 13 includes a second base portion 27 having a wall 13A forming a through hole 13a into which the synthetic resin foam material P is inserted, and a third base portion 28 that can be contracted prior to the deformation portion 18 when pressed. And prepare. The through-hole 13a is formed in a size that allows at least a part of the height direction of the synthetic resin foam material P placed on the first mold 12 and the first mold 12 to be inserted when pressed, and is formed in the center of the second base portion 27. It is distributed through the part.

The second base portion 27 is made of wood such as veneer, metal, or the like. The third base portion 28 is formed of a material having elasticity softer than that of the deformation portion 18 and has a predetermined thickness, and is connected to the lower end of the second base portion 27 in the pressing direction. In the second base portion 27 and the third base portion 28, the combined height of the thicknesses of the third base portion 28 and the second base portion 27 in a non-compressed state when not pressed exceeds the height of the first mold 12, and The sum of the thicknesses of the third base portion 28 and the second base portion 27 in the compressed state is formed so as not to exceed the height of the first mold 12 when pressed.

The engaging portion 15 includes a protrusion 30 that protrudes from the outer surface of the first die 12 in the vertical direction of the center axis C1, and a hole 31 that is provided inside the wall 13A and engages with the protrusion 30. And prepare. The projecting portion 30 is formed in a rectangular parallelepiped shape. The projecting portion 30 and the hole portion 31 are relatively movable only in the pressing direction in an engaged state.

Next, the operation of the resin molded body punching die 10 according to the present embodiment will be described together with the method of molding the cylindrical body CY.

First, the first mold 12 is assembled by sequentially stacking the deformation portion 18 and the stepped portion 20 on the first base portion 17 on which the cutting blade 11 is erected in advance. Then, the second die 13 is connected to the first die 12 by engaging the protrusion 30 and the hole 31 . Subsequently, the synthetic resin foam material P is stored in the through hole 13a.

In this state, the resin molding punching die 10 is pressed with a predetermined pressure by a pressing machine (not shown) from above or below, which is the pressing direction. During pressing, the synthetic resin foam material P and the third base portion 28 are compressed, then the deformation portion 18 is compressed, and the cutting is completed when the pressing plate of the pressing machine reaches the cutting blade 11 .

Here, when the synthetic resin foam material P is pressed, the synthetic resin foam material P tends to expand in directions other than the pressing direction while being compressed in the pressing direction. However, since the synthetic resin foam material P is housed in the through hole 13a, even if the side surface of the synthetic resin foam material P tries to expand in a direction other than the pressing direction, the wall 13A of the through hole 13a will cause the foam material P to expand in a direction other than the pressing direction. deformation is suppressed.

On the other hand, inside the synthetic resin foam material P, the synthetic resin foam material P inside the inner blade 21 moves to the inner blade 21 side by the second step 25, and the synthetic resin foam material P outside the outer blade 22 moves to the second step. It is returned to the outer cutting edge 22 side by the two-stepped portion 25 . After the synthetic resin foam material P is compressed, the deformation portion 18 is compressed so that the tip of the cutting blade 11 protrudes beyond the second stepped portion 25 . Thus, the cutting of the synthetic resin foam material P is completed when the pressing plate of the press (not shown) and the cutting blade 11 come into contact with each other.

The synthetic resin foam material P is also cut into a predetermined shape by the peripheral cutting edge 16 . At this time, the synthetic resin foam material P outside the peripheral cutting edge 16 is returned to the peripheral cutting edge 16 side by the third stepped portion 26 arranged outside the peripheral cutting edge 16, and is generated outside the peripheral cutting edge 16. The force that tends to pull the cylindrical body CY side surface outward is suppressed.

According to this resin molding punching die 10, the first base 17 of the first die 12 and the second base 27 and the third base 28 of the second die 13 are provided, and when the synthetic resin foam material P is pressed, the first base 17 and the third base 28 are provided. The three-base portion 28 moves in the pressing direction with respect to the cutting blade 11 while contracting. Therefore, when the synthetic resin foam material P shrinks in the pressing direction during pressing, the walls 13A of the through holes 13a can continue to prevent the side surfaces of the synthetic resin foam material P from expanding in directions other than the pressing direction. . Therefore, deformation such as gouging in the cylindrical body after punching can be suppressed, and the cylindrical body CY in which gouging occurring in the synthetic resin foam material P is suppressed is formed.

In addition, since the resin molded body punching die 10 includes the deformable portion 18 and the stepped portion 20, the direction of deformation of the synthetic resin foam material P around the cutting blade 11 during pressing is controlled, and the side surface of the cylindrical body CY is more suitable. Can be shaped into shape. At this time, since the stepped portion 20 includes a first stepped portion 23 lower than the tip of the inner blade 21 and a second stepped portion 25 higher than the tip of the inner blade 21, deformation of the synthetic resin foam material P Direction can be better controlled. Further, by controlling the order of deformation of the synthetic resin foam material P, the deformable portion 18 and the third base portion 28 when pressed, gouging can be more preferably suppressed.

(Second embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. 4 and 5. FIG.
In addition, the same code|symbol is attached|subjected to the component similar to 1st Embodiment mentioned above, and description is abbreviate|omitted.
The difference between the second embodiment and the first embodiment is that the resin molded body punching die 40 according to the present embodiment is formed by forming a plurality of cylindrical bodies (molded bodies) (not shown) from a rectangular parallelepiped synthetic resin foam material P. It is a point that it is molded.

The cutting blades 42 arranged on the first mold 41 are provided only with a plurality of cylindrical outer blades 22 for forming a cylindrical body. As for the stepped portion 43 , the first stepped portion 23 is arranged inside the outer cutting edge 22 , and the second stepped portion 25 is arranged between the outer side of the outer cutting edge 22 and the peripheral cutting edge 16 .

Next, the operation of the resin molding punching die 40 according to the present embodiment will be described together with the method for molding a cylindrical body.

First, the first mold 41 is assembled in the same manner as the first mold 12 according to the first embodiment. Then, the protrusion 30 and the hole 31 are engaged to connect the second die 13 to the first die 41 . Subsequently, the synthetic resin foam material P is stored in the through hole 13a.

In this state, the entire mold is pressed from above or below with a predetermined pressure by a pressing machine (not shown) as in the first embodiment. During pressing, the synthetic resin foam material P and the third base portion 28 are compressed, and the deformation portion 18 is compressed.

When the outer blade 22 cuts the synthetic resin foam material P, the synthetic resin foam material P is compressed and expands in a direction other than the direction in which it is compressed when cut by the cutting blade 42, as in the first embodiment. and However, since the synthetic resin foam material P is housed in the through hole 13a, deformation of the side surface of the synthetic resin foam material P in directions other than the pressing direction is suppressed. Further, since the stepped portion 43 is arranged inside the synthetic resin foam material P, the synthetic resin foam material P outside the outer blades 22 is returned to the outer blade 22 side. In this way, a cylindrical body is formed in which gouging of the synthetic resin foam material P is suppressed.

According to this resin molded body punching die 40, it is possible to suppress deformation such as gouging in the molded body after being punched out, similarly to the cylindrical body CY.

The technical scope of the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the present invention.
For example, the first molds 12 and 41 are configured by laminating the first base portion 17, the deformation portion 18, and the stepped portions 20 and 43 in this order, but the order is not limited to this, and the stepped portions 20 and 43 are stacked in this order. Any configuration may be employed as long as it is arranged at the top. Also, although the first mold 12, 41 has the first base 17 and the second mold 13 has the second base 27 and the third base 28, the combination of the first base, the second base and the third base is It is not limited to this.

Furthermore, although the third base portion 28 is connected below the second base portion 27, it is not limited to the below connection. In addition, although it is assumed that the third base shrinks due to pressing, for example, the third base is arranged between a pressing machine (not shown) and the synthetic resin foam material P and has a size that can be fitted into the through hole. , and when the synthetic resin foam material P is pressed together with a pressing machine, it does not need to be contracted.

Further, the deformation portion 18 is not limited to one layer, and a plurality of layers may be laminated depending on the arrangement location. Moreover, the thickness (height) of each portion may be set according to the thickness of the synthetic resin foam material corresponding to the thickness of the cylindrical body or columnar body to be molded.

10, 40 Resin molded body punching die 11, 42 Cutting blade 17 First base 18 Deformed part 20, 43 Stepped part 23 First stepped part 25 Second stepped part 27 Second base 28 Third base CY Cylindrical body (molded body)
P synthetic resin foam

Claims (4)

A resin mold punching die for pressing a synthetic resin foam material to create a molded product,
a first base having a cutting blade for cutting the synthetic resin foam;
a second base portion that does not deform when pressed and into which at least a part of the cutting blade and the first base portion are inserted and that suppresses deformation of the synthetic resin foam material in a direction other than the pressing direction;
a third base portion connected in the pressing direction of the second base portion and moving while contracting in the pressing direction with respect to the cutting blade when the synthetic resin foam material is pressed;
A die for punching a resin molded body. a deformable portion disposed around the cutting blade and capable of being contracted by pressing;
a stepped portion whose tip is arranged with a height difference with respect to the tip position of the cutting blade;
The resin molding die according to claim 1, comprising: 3. The resin molding die according to claim 2, wherein the stepped portion includes a first stepped portion lower than the tip of the cutting blade and a second stepped portion higher than the tip of the cutting blade. The deformation portion is made of a material harder than the synthetic resin foam material,
3. The punching die for a resin molding according to claim 2, wherein the third base portion is contractible prior to the deformation portion when pressed.

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