JP2000238042A - Mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to easily adjust neither scraping nor padding a mold for adjusting the volume (thickness) of a cavity by a method wherein strike adjusting members are provided on the mating mold surfaces of a projection mold and of a recession mold. SOLUTION: A stock liquid poured through a pouring port 7 fills a cavity 5 through a pouring gate 3 and overflows and enters in a vent. Between the mating mold surface of a projection mold 1 and of a recession mold 2, the pouring gate 3 and an adjusting member 4a equipped with a packing 11a from preventing a resin from leaking are provided. A space 12 is arranged between a strike adjusting member 4a and the mating surface of the projection mold 1. The strike adjusting member 4a is fixed to the mating surface of the projection mold 1 by means of fixing pins 13. By changing the thickness of the spacer 12, the volume (the thickness) of the cavity 5 is changed as a result. Thus, the volume of the cavity 5 can be changed by changing the thickness of the spacer 12 without requiring working such as the scraping the contact surface between the projection mold and the recession mold, the padding by welding or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a reaction injection molding (R)
The present invention relates to a molding die which is suitably used for IM) or the like and can easily adjust the volume of a cavity (gap).

[0002]

2. Description of the Related Art Conventionally, RIM molding dies using dicyclopentadiene or the like as a raw material liquid are conventionally composed of a pair of convex and concave molding dies. In order to prevent this, a packing is formed, and a cavity (cavity) forming the molded body is formed by abutting the mating surfaces of both the convex type and the concave type. Therefore, the capacity of the cavity is determined by the pair of molding dies (convex and concave) and cannot be easily adjusted.

[0003]

However, when a molded article is manufactured by using such a molding die, the obtained molded article does not maintain a desired strength, or conversely, a strength that is not necessary. In this case, it is necessary to adjust the capacity (thickness) of the cavity before mass production. That is, when the desired strength is not maintained, usually, a treatment for cutting the convex or concave mold is performed, and when the strength is more than necessary,
The convex surface or the concave surface for forming the cavity is adjusted to the material of the mold, and treatments such as increasing the thickness (building up) by processing such as welding, plating (electroforming), and nesting have been performed. Such a procedure is a cumbersome task, and the time spent there is not negligible.

An object of the present invention is to solve such a problem, that is, to cut a molding die (convex or concave) or adjust a convex or concave surface to adjust the capacity (thickness) of a cavity. It is an object of the present invention to provide a molding die capable of easily adjusting the capacity (thickness) of the cavity without performing a troublesome operation such as increasing (building up) the thickness of the cavity by welding or the like.

[0005]

Means for Solving the Problems In order to achieve the above object, a molding die of the present invention (also referred to as a molding die).
Has the following configuration. That is, the molding die of the present invention is a molding die in which the cavity 5 is formed between a pair of the convex mold 1 and the concave mold 2, and the adjusting member 4 contacts the mold mating surface between the convex mold 1 and the concave mold 2. (4a, 4b, 4c) is provided, It is a molding die characterized by the above-mentioned.

[0006]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is an external perspective view of a pair of molding dies according to the present invention. Figure 2 for details
As shown in FIG. 8, as is clear from FIG. 1, the molding die of the present invention comprises a convex mold 1 and a concave mold 2.

FIG. 2 is a longitudinal sectional view of a pair of molding dies (convex mold and concave mold) according to the present invention, FIG. 3 is a front view of the convex mold 1 viewed from the concave mold 2 side, and FIG. FIG. 2 is a front view when viewed from the side of the convex mold 1. FIG. 5 is an enlarged view of the portion α in FIG.
FIG. 6 is an enlarged view of the portion β in FIG.

The mold mating surface 9 of the convex mold 1 (see FIG. 3) and the concave mold 2
By matching with the mold matching surface 10 (see FIG. 4),
The molding die has a cavity (gap) 5 as shown in FIG.
Is formed.

As shown in FIG. 3, a plurality of contact adjusting members 4 (4a, 4b, 4c) are arranged on the convex mold 1. In addition, the pressing part 14 of the convex 1 and the pressing part 15 of the concave 2
Are provided on the surface of the injection gate 3, the end side surface, and the surface of the vent (overflow) 6 (FIGS. 2, 5, and 6).

As the contact adjusting member 4, a plate-like member is preferably used, and the material thereof is preferably metal or reinforced plastic, and among them, S55C and S45C are preferably used. The installation area of the contact adjustment member 4 varies depending on the size of the mold (length × width), but is preferably about 20 to 80% of the convex mold surface 9. Contact adjustment member 4
As shown in FIG. 3, it is preferable that one or more mounting positions be mounted on the matching surface 9 and on any one of the four sides of the square-shaped matching surface 9. Further, it is preferable that the mounting members 9 be attached at positions 50 mm to 150 mm apart from the four ends of the mating surface 9.
The installation interval varies depending on the size of the mold.
It is preferably about mm to 500 mm. Further, the distance from the end face of the push-off portion 14 to the hit adjustment member 4 is preferably 1
It is about 0 mm to 20 mm.

Although the method of installing the contact adjusting member 4 is not particularly limited, it can be performed as follows.
That is, about 1 mm to 1 mm larger than the size of the hit adjustment member 4.
A mounting groove 17 having a size as large as 0 mm is provided in the convex mold 1,
The adjusting member 4 is inserted into the mounting groove 17 and fixed with the fixing pin 13. In order to adjust the height of the hit adjustment member 4, preferably, a spacer (adjustment plate) 12 is inserted between the hit adjustment member 4 and the mounting groove 17.

As shown in FIG. 3, the convex mold 1 is provided with a contact adjusting member 4a having an injection gate 3 on one side of the long side of the cavity 5, and the other of the cavity 5 opposed to the contact adjusting member 4a. A hit adjusting member 4b having a vent 6 is also provided on the long side, and a hit adjusting member 4c is also provided on two short sides of the cavity 5. In the above example, the example in which the hit adjustment member 4 is installed on the convex molding surface 9 has been described. However, the hit adjustment member 4 may be installed on the concave molding surface 10 without any problem. .

Regarding the structure of the push-off portions (14, 15),
Either the convex mold 1 or the concave mold 2 may be on the pushing side (inside) or may be on the receiving side (outside). However, in order to prevent intrusion (leakage) of the raw material liquid, it is preferable to use the packing 11b in the inner cut-off portion or the outer push-off portion.

FIG. 7 is a horizontal sectional view of a pair of molding dies (convex and concave dies) according to the present invention, and FIG. 8 is an enlarged view of a portion γ in FIG.

The mounting position of the packing 11b is on the pressing side (the convex type 1 in FIGS. 7 and 8), and the effective adjustment range 1
Although it is not particularly limited as long as it is within 6, the position is preferably set at a distance of 5 mm to 10 mm from the end face 18 of the convex press-cutting portion.

The clearance 21 between the convex press-cut portion 14 and the concave press-cut portion 15 does not come into contact with the convex press-cut portion 14 and the concave press-cut portion 15 in consideration of the molding temperature and the thermal expansion of the molding die. The distance is not particularly limited as long as it is within the effective height 22 of the packing 11b, but is preferably 0.5 mm to
1.0 mm. Also, the effective adjustment range 16 of the push-off section 15
Is preferably from 0 to 15 mm, though it depends on the shape of the molded body.

Preferred materials for the packing 11b are fluorine rubber and silicone rubber which are excellent in heat resistance and abrasion resistance and are not frequently replaced. Also,
Preferred materials for the convex and concave types are S45C,
S55C, NI electroformed, aluminum, zinc alloy and the like.

The flow of the raw material liquid during molding will be described below with reference to FIGS. The raw material liquid injected from the injection port 7 (see FIG. 4) fills the cavity 5 through the injection gate 3, overflows the cavity 5, and is injected into the vent 6. At this time, the air in the cavity 5 is discharged through the air vent groove 8 to the outside of the mold.

Next, the adjustment of the capacity (thickness) of the cavity 5 will be described with reference to FIG. 5, FIG. 6, FIG. 7 and FIG. FIG. 5: Between the mating surface of the convex mold 1 and the mating surface of the concave mold 2, a contact adjusting member 4a provided with an injection gate 3 and a resin leakage preventing packing 11a is provided.
The spacer 12 is arranged between the mating surface a and the projection 1. Here, the contact adjustment member 4 a is fixed to the mold matching surface of the convex 1 by the fixing pin 13. By changing the thickness of the spacer 12, the insertion depth of the fixing pin 13 into the mold mating surface changes, and as a result, the capacity (thickness) of the cavity 5
Can be changed.

FIG. 6: A hit adjusting member 4b having a vent 6 and an air vent groove 8 is provided between the mating surface of the convex 1 and the mating surface of the concave 2, and the hit adjusting member 4b and the convex 1 are provided. The spacers 12 are arranged between the mold matching surfaces. Here, the contact adjusting member 4 b is fixed to the convex 1 by the fixing pin 13.
Fixed on the mating surface. By changing the thickness of the spacer 12, the insertion depth of the fixing pin 13 into the mold mating surface changes in the same manner as described above, and as a result, the capacity (thickness) of the cavity 5 can be changed.

FIGS. 7 and 8: A contact adjusting member 4c is provided between the mating surface of the convex mold 1 and the mating surface of the concave mold 2, and the contact adjusting member 4c is provided between the mating surface of the convex mold 1 and the contact adjusting member 4c. Is spacer 1
2 is arranged. In addition, the packing 1 is
1b is provided, so that the raw material liquid can be prevented from leaking out of the cavity 5 within the effective adjustment range 16 of the concave press-off portion 15. The method of changing the capacity (thickness) of the cavity 5 is the same as the method described above.

[0022]

The molding die according to the present invention has a contact adjusting member (or a contact adjusting member) on the surface (mold matching surface) where the convex and concave dies contact.
Since the spacers are installed together with the contact adjustment members, there is no need for complicated work such as shaving the surface (mold matching surface) where the convex and concave molds come in contact with each other, or building up by welding.
By changing the thickness of the spacer, the capacity (thickness) of the cavity can be easily changed. The molding die according to the present invention is a reaction injection molding (RI) using a norbornene-based cycloolefin such as dicyclopentadiene as a raw material liquid.
It is useful as a molding die of M), and can be used to manufacture a septic tank (or an outer tank of the septic tank).

[Brief description of the drawings]

FIG. 1 shows a pair of molding dies (convex and concave) according to the present invention.
It is an external appearance perspective view of.

FIG. 2 shows a pair of molding dies (convex and concave) according to the present invention.
FIG.

FIG. 3 is a front view of the convex mold according to the present invention as viewed from the concave mold side.

FIG. 4 is a front view of the concave mold according to the present invention as viewed from the convex mold side.

FIG. 5 is an enlarged view of a portion α in FIG. 4;

FIG. 6 is an enlarged view of a portion β in FIG. 4;

FIG. 7 shows a pair of molding dies (convex and concave) according to the present invention.
FIG.

FIG. 8 is an enlarged view of a γ portion in FIG. 7;

[Explanation of symbols]

1: convex type 2: concave type 3: injection gate 4: contact adjustment member 4a: contact adjustment member (injection side) 4b: contact adjustment member (vent side) 4c: contact adjustment member (side surface) 5: cavity 6: vent 7 : Injection port 8: Air release groove 9: Convex type mold mating surface 10: Concave type mold mating surface 11 a: Packing (mold mating surface part) 11 b: Packing (push off part) 12: Spacer 13: Fixing pin 14: Convex type press cut off Part 15: Recessed cut-off part 16: Effective adjustment range 17: Mounting groove 18: End face of convex-shaped cut-off part 19: Packing seal width 20: Push-off part width 21: Clearance 22: Effective packing height

Claims (1)

[Claims] 1. A molding die for forming a cavity between a pair of convex and concave dies, wherein an adjusting member is provided to contact a mating surface between the convex and concave dies.