JPS5916184Y2 - centrifugal molding equipment - Google Patents

Description

[Detailed description of the invention] Industrial field of application The present invention relates to a centrifugal molding device, and in particular, it centrifugally molds resin pipes, mortar pipes, and composite pipes onto a rubber mold attached to the inner surface of a rotating mold, and forms a molded pipe ( This invention relates to a centrifugal molding device that can take out a product (product) in an uncured state together with a rubber mold from a rotary mold and pass it to a plastic processing section (bent tube molding section).

Conventional structure and its problems In the past, the uncured molded tube was taken out and assembled into a plastic processing mold together with a rubber mold, and the desired plastic processing was performed. I was unable to work efficiently due to the necessity.

Also, during plastic working (bending), the inner diameter side contracted, causing wrinkles in the product.

OBJECT OF THE INVENTION An object of the present invention is to provide an apparatus capable of centrifugally forming uncured tubes on a mold for plastic working, and then taking them out as a unit from the rotary mold.

Structure of the Invention In order to achieve the above object, the centrifugal molding device of the invention includes a rotary mold that can be freely divided in the radial direction, an intermediate mold that can be freely attached to the inner peripheral surface of the rotary mold, and an inner mold of the intermediate mold. It has a rubber mold that can be freely attached on a peripheral surface, and a pair of end face jigs that can be attached and detached to both ends of the rubber mold and both ends of the rotary mold, and the intermediate mold is fitted onto the rubber mold. A plurality of cylinders arranged side by side, outward flanges integrally formed on opposing side edges of these cylinders, externally fitted between the opposing flanges, and with one location in the circumferential direction having the maximum inner surface area. A ring body with a U-shaped cross section whose internal dimension is gradually displaced so that the position displaced by 180° becomes the minimum internal dimension, and a pair of rings each attached to flanges facing each other at the maximum internal internal dimension so as to be swingable in the axial direction. A link, a movable body to which the free ends of these links are connected so as to be relatively swingable and have a radial rack body, and a rotating shaft having a pinion that engages with the rack body and supported by the ring body. It consists of

Examples and effects Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIGS. 1 and 2, the part above the rotation axis 1 shows the state before molding, and the part below shows the state after molding.

2 is a rotating type that can be freely divided into two in the radial direction.
It is rotatable around the rotation axis 1 via a plurality of rolls 3, and the rotational power is applied from the rolls 3 side.

4 is an intermediate mold that can be freely installed on the inner peripheral surface of the rotary mold 2;
As shown in FIGS. 4 to 4, a plurality of cylinders 5 are arranged in parallel in the direction of the rotation axis 1, and outward flanges 6A and 6B integrally formed on the opposing side edges of these cylinders 5. , a ring body 7 having a U-shaped cross section that fits between the opposing flanges 6A and 6B, a pair of links 8A and 8B disposed within the ring body 7 at one location in the circumferential direction, a rack body 9, It is composed of a pinion 10.

The links 8A and 8B are attached to the flanges 6A and 6B such that they can swing relative to each other in the axial direction, and one link 8
A rack body 9 is attached to the rack body 9 so as to be swingable toward the target, and a guide plate 11 facing the rack body 9 is attached to the other link 8B.
are installed so that they can swing freely relative to each other.

A connecting plate 12 is connected between the ends of the rack body 9 and the guide plate 11.
These 9, 10, and 11 constitute a movable body, and the pinion 10 is positioned between the rack body 9 and the guide plate 11 so as to be in constant engagement with the rack body 9.

The ring body 7 is formed so that the position where the pinion 10 and the like are disposed has the maximum internal power, and the position displaced by 180 degrees from the position has the maximum internal power, so that the flange 6
When A and 6B are brought into mutual contact with each other, a movement permissible space 13 is formed between the flanges 6A and 6B and the inner surface of the ring body 7, in which the vinyl pion 10 and the like can be disposed at a maximum position.

The pinion 10 is supported on the ring body 7 side via a rotating shaft 28.

When each cylindrical body 5 is in the shape of a straight tube, the inner end of the rack body 9 is positioned opposite to the pinion 10.

The opposing shaft ends of the rotating shaft 28 are connected to each other by an elongated hole ring 14 and an eye bolt body 15 that engages with the elongated hole ring 14 so as to be expandable and contractable in the axial direction.

The intermediate mold 4 configured in this manner is attached onto the inner circumferential surface of the rotary mold 2 via the outer surface of the ring body 7.

Reference numeral 16 denotes a rubber mold that can be freely attached to the inner circumferential surface of the intermediate mold 4, that is, the inner circumferential surface of the group of cylinders 5, and is made of fluorocarbon rubber, silicone, urethane, etc., and has a hollow portion 17 formed in its body. Fluid such as fluorine oil or specific gravity additive oil is injected here, and there are outer ring parts 18A at both ends.
, 18B are formed.

The hollow part 17 is formed to prevent liquid leakage, and since the hollow part 17 is annular, the rubber mold 16
In order to prevent the inner cylindrical portion from deforming downward due to its own weight, the inner and outer cylindrical portions are connected by a connecting member 19, or the hollow portion 17 is formed of open foam.

20A and 20B are ring-shaped rubber presser jigs that are fitted into both ends of the rotary mold 2, and the outer and inner surfaces of the ring portions 18A and 18B, as well as the outer peripheral surface of the rubber mold that follows these inner surfaces, can freely come into contact with each other. .

Reference numerals 21A and 21B are end face jigs that can be attached and detached to both ends of the rotary mold 2 and the rubber mold 16, and have cylindrical parts 22A and 22B whose inner ends can be fitted into the rubber mold 16, and ring parts 18A and 18.
The rubber pressing jig 20A consists of flanges 23A, 23B that can come into contact with the outer surface of the rubber presser jig 20A.

20B with fixtures 24A and 24B, the ring portions 18A and 18B at both ends of the rubber mold 16 are fixed to the rotary mold 2 side.

The inner surfaces of the end face jigs 21A and 21B are formed into tapered surfaces 25A and 25B having an outer diameter larger than an inner diameter.

Furthermore, inward annular protrusions 26A, 26B are formed at the inner ends of both tapered surfaces 25A, 25B.

The portion above the rotation axis 1 in FIGS. 1 and 2 shows the state before molding.

That is, the intermediate mold 4 inserted into the rotating mold 2 has a straight tube shape, and a pinion 10 is located at the inner end of the rack body 9.

Further, the rubber mold 16 inserted into the intermediate mold 4 has its both end ring parts 18A and 18B fixed to the rotary mold 2 side by the rubber holding jigs 20A and 20B and the end face jigs 21A and 21B. There is.

In this state, while rotating the rotary mold 2 around the rotation axis 1, resin liquid, reinforcing fibers, sand, etc. are applied onto the molding inner surface of the rubber mold 16 through the central through hole of either of the end jigs 21A, 21B. Materials are supplied, and a product (tube) 27 is centrifugally formed as shown below the rotation axis 1 in FIGS. 1 and 2.

When performing such centrifugal molding, the rotary mold 2 and intermediate mold 4 are
Even if the molding inner surface of the rubber mold 16 is deformed (displaced) due to manufacturing errors or eccentricity, it will be made into a perfect circle by the action of the liquid.

Also, when the material is supplied, a part of it is attached to the end face jigs 21A and 21.
Although it may spill into the inside of B, this will be automatically discharged by the outward-opening tapered surfaces 25A and 25B.

Further, since the annular protrusions 26A and 26B are located at both ends of the product 27, the occurrence of flashing in the iron part is eliminated.

The rotary mold 2 is stopped when the product 27 is uncured (semi-cured).

Next, the rotary mold 2 is divided into an intermediate mold 4 and a rubber mold 1.
6 and the product 27 are taken out.

At this time, the end face jigs 21A and 21B are also taken out together.

Thereafter, when the rotating shaft 28 is rotated, the rack body 9 and the guide plate 10 are sent inward by the rotation of the pinion 10, and the links 8A and 8B are opened as shown in FIG.

As a result, the movement permissible space 13 is reduced and both flanges 6A, 6B are separated.

Therefore, the intermediate die 4 is elongated on the side where the pinion 10 etc. are present, and neither elongation nor contraction occurs on the opposite side, so that the product 27 is bent as shown in FIGS. 5 and 6.

After bending and hardening, both end faces jigs 21 A, 21
Remove B.

Then, with the liquid in the hollow part 17 drained, the bent pipe is taken out from the rubber mold 16.

Note that the mold diameter is adjusted by the amount of liquid injected.

Effects of the invention According to the invention having the above configuration, the following effects can be expected.

In other words, the product (
(unhardened tubes) can be centrifugally formed, and they can be taken out of the rotary mold as one piece and subjected to plastic working (bending).

That is, centrifugal molding can be performed in an intermediate mold that serves as a mold for plastic working, and operations from centrifugal molding to plastic working can be performed quickly as a series.

Furthermore, by rotating the pinion after taking it out as a whole, it is possible to stretch the pinion side between the cylindrical bodies that constitute a part of the intermediate mold and perform curved pipe forming. It is possible to obtain a curved pipe without wrinkles.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional front view;
Figure 2 is a vertical side view, Figure 3 is an enlarged view of the main parts in Figure 2, Figure 4 is an enlarged view of the main parts in Figure 1, Figure 5 is a front view during bending, and Figure 6 is an enlarged view of the main parts in Figure 1. FIG. 6 is a longitudinal sectional front view of the main part in FIG. 5; 2... Rotating type, 4... Intermediate type, 5...
...Cylinder, 6A, 6B...Flange, 7.
...Ring body, 8A, 8B...Link,
9...Rack body, 10...Pinion,
11...Guide plate, 12...Connection plate,
16...Rubber mold, 17...Hollow part, 2
1A, 21 B... End jig, 27...
・Product (pipe), 28... Rotating shaft.

Claims (1)

[Scope of utility model registration request] A rotary mold that can be freely divided in the radial direction, an intermediate mold that can be freely installed on the inner peripheral surface of this rotary mold, a rubber mold that can be freely installed on the inner peripheral surface of this intermediate mold, and both ends of this rubber mold and a pair of removable end face jigs at both ends of the rotary mold;
The intermediate mold is fitted over the rubber mold with a plurality of cylinders disposed in parallel, outward flanges integrally formed on opposing side edges of these cylinders, and externally fitted between the facing flanges. and a ring body with a U-shaped cross section whose internal dimensions are gradually changed so that one point in the circumferential direction has the maximum internal extent and a position displaced by 180° has the minimum internal internal dimension, and a ring body that is in mutual contact at the maximum internal internal dimension. A pair of links each attached to a flange so as to be swingable in the axial direction, a movable body having a rack body in the radial direction and with the free ends of these links connected so as to be freely swingable relative to each other, and a pinion that engages with the rack body. and a rotating shaft supported by the ring body.