JPS6195904A - Formwork for manufacturing molded shape - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a mold for producing a molded body, which is used when manufacturing a molded body made of cement, ceramics, plastic, etc. It relates to an inner mold for molding.

[Conventional technology]

This type of mold for producing a molded object is configured such that the inner surface of the molded object is directly molded using the outer surface of the inner mold.

However, when using this conventional formwork, there were the following disadvantages.

In other words, when the molded body is cured and hardened, the molded body contracts and the inner mold is tightened, so that the molded body is brought into close contact with the inner mold. Therefore, it is difficult to remove the inner mold from the mold, which not only reduces the workability of demolding, but also makes it easy to damage the corners, especially when there are corners on the inner surface of the molded product. There were drawbacks.

In addition, if the inner mold is of a split type, molding materials such as mortar will enter the joints of each split mold, and this will become seams and remain on the inner surface of the molded product, resulting in a poor finish and leaking from the joints. Since leaked mortar and the like adhere to the joint surfaces of each split mold, it is necessary to spend a lot of time and effort on troublesome maintenance work such as peeling off and cleaning the adhered substances. As a means to save such labor, it may be possible to improve the manufacturing precision of each split mold to prevent mortar from entering the joint, but this would reduce the productivity of the inner mold and This creates new problems such as increased costs.

[Problem that the invention seeks to solve]

The present invention was made in consideration of the above-mentioned circumstances, and its purpose is to improve the accuracy of finishing the inner surface of a molded body while manufacturing the inner mold relatively roughly, and to The aim is to improve demolding work efficiency.

[Means for solving problems]

The mold for producing a molded article according to the present invention, which has been adopted to achieve the above object, is characterized by being able to be attached to and removed from the inner mold, and in the installed state, the inner surface of the molded article to be manufactured is used instead of the outer surface of the inner mold. The point is that a thin plate-shaped mold made of an elastic material is provided for molding, and its functions and effects are as follows.

[For production]

In other words, even if the molded body shrinks during curing and hardening,
Since the amount of contraction is absorbed by the elastic deformation of the thin plate-shaped die made of the elastic material, the tightening force acting on the inner die can be significantly reduced.

Furthermore, since the inner mold and the thin plate-like mold made of an elastic material are detachable, the inner mold can be easily removed without any difficulty. and,
After demolding the inner mold, the thin plate-like mold made of an elastic material that is in close contact with the inner surface of the molded body can be easily removed by turning it over. Therefore, even if there are corners on the inner surface of the molded product,
, this corner will not be damaged.

In addition, even in the case of a split inner mold, by covering the joints of each split mold with the thin plate-shaped mold made of the elastic material, even if the manufacturing precision of each split mold is poor, mortar etc. can be applied to the joints. Since it can be easily prevented from entering, the finish of the inner surface of the molded body is improved and there is no need for maintenance work on the inner mold afterwards.

〔Effect of the invention〕

Therefore, according to the present invention, it is possible to improve the accuracy of the inner surface finishing of the molded body while manufacturing the inner mold relatively roughly by simply attaching a thin plate-shaped mold made of an elastic material to the inner mold. Moreover, it was possible to improve the efficiency of demolding the inner mold.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

(1) is the split type (IA), (IB) is the horizontal axis center (X)
It is a metal inner mold that is connected so that it can be bent freely, (
2) Bottom plate (2A), side plate (2B)..., top plate (2C)
) is a metal outer mold formed by bolting together each of the
The inner mold (1) is fixed to the bottom plate (2A) of the outer mold (2) with bolts. Further, the inner mold (1) is provided with the split mold (IA), which is detachable from the inner mold, is in close contact with the entire outer surface of the inner mold (1) in the attached state, and is attached to the inner mold (1).
, (IB) are fitted with a series of laminar molds (3) made of elastic material which also cover the joints.

Next, using the formwork constructed in this way, the leg members (4A), (4A) and the main body (4A) as shown in FIG.
The procedure for manufacturing a planter (4) made of glass fiber reinforced concrete (an example of a molded body) which is integrally molded with B) will be explained.

First, as shown in Fig. 1, a formwork is fixed on a diaphragm (5) equipped with a vibrator (5A), and while applying vibration to the formwork, the mold is passed through the opening of the top plate (2C). Pour glass fiber mixed cement mortar into the frame while defoaming.

Next, as shown in FIG. 2, the formwork is removed from the diaphragm (5), and in this state, the mortar in the formwork is cured and hardened.

Then, the outer mold (2) is removed, the molded body (4) is inverted, and as shown in Fig. 3, the split mold (14), (IB)
is bent around the horizontal axis (X), and the inner mold (1) is removed from the molded body (4).

Thereafter, as shown in FIG. 4, the thin plate-shaped mold (3) made of an elastic material that is in close contact with the inner surface of the molded body is removed by turning it over.

Note that the protrusion (3A) provided on the mold (3) is a molded object (4).
) is for forming a drainage hole (4C) provided at the bottom of the mold, which has a hole (3B) for discharging air that has entered between the mold and the inner mold (1) to the outside of the mold. has been done.

The elastic material for the mold (3) includes silicone rubber and urethane rubber, among which silicone rubber is suitable because it deteriorates more slowly than urethane rubber, is more stretchable, and does not require a release agent.

[Another example]

In the above embodiment, the air exhaust hole (3B) was provided in the thin plate-like mold (3) made of an elastic material, but instead of this, the hole (3B) for air discharge was provided in the inner mold (1).
may be provided.

In the above embodiment, a molded body is manufactured by a so-called precast method in which mortar is poured into a mold formed by an inner mold (1) and an outer mold (2).
Spraying, which does not require the use of an outer mold (2), may be applied to manufacturing by molding.

In addition, in the example, the formwork was made of mortar molded product 1,
Although we have shown the product used for manufacturing, it may also be used for other purposes such as the production of ceramics or plastic products.

[Brief explanation of the drawing]

1 to 4 are sectional views showing a molded body manufacturing process using a mold for manufacturing a molded body according to the present invention, and FIG. 5 is a perspective view of the molded body. (1)...Inner mold, (3)...Mold made of elastic material, (4)...Molded body.

Claims (1)

[Scope of Claims] [1] A mold for manufacturing a molded body, which includes an inner mold (1) for molding the inner surface of a molded product (4), which is removable from the inner mold (1) and is in an attached state. A mold for producing a molded body, which is provided with a thin plate-shaped die (3) made of an elastic material for molding the inner surface of the molded body to be manufactured instead of the outer surface of the inner mold (1). [2] The mold for producing a molded body according to claim 1, wherein the elastic material is rubber.