JPS5822332B2 - Kanagata Souchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold device for forming pipes with different diameters, and more particularly, the present invention relates to a mold device for forming pipes with different diameters, and more particularly, a mold device in which a ring groove is formed on the inner periphery of the tip of the opening, or a seal engaging ring or a stopper ring is implanted. In a mold device for forming diameter pipes, an elastic body is attached to the inner surface of the outer mold that presses and regulates the different diameter portion from its outer periphery, and it is used to accurately regulate the inner surface of the different diameter portion and to make its outer surface smooth. This invention relates to a mold for forming pipes of different diameters, which is configured to be able to form pipes of different diameters.

In the present invention, different diameter pipes include long pipes, pipe fittings, etc., which have a seal mounting groove formed on the inner periphery of the socket, or those with a seal retaining ring or stopper ring implanted on the inner periphery of the socket. This is a general term, and particularly refers to tubes of different diameters formed by sleeve molding.

The open ends of headless long tubes and short tubes are heated and softened, and a deformable core is pushed into them to enlarge the diameter. At the same time, a groove for attaching a seal is formed on the inner periphery of the enlarged diameter part, and a ring for attaching the seal is formed. It is well known that a stopper ring is implanted to form pipes of different diameters such as socket pipes and pipe joints.

For example, Figures 1 to 4 are schematic vertical cross-sectional views of main parts to explain the process of manufacturing different diameter pipes using a known mold device for forming different diameter pipes, and Figures 1-2 show the installation of a packing on the inner surface of the socket. FIGS. 3 and 4 show the step of forming the groove, and the step of implanting the packing engagement ring on the inner surface of the socket, respectively.

That is, according to FIG. 1-2, the mold device 1 includes a plurality of thrust members 3, 3.・・・・・・
is built-in, so when the diameter of the thrust member 3 is expanded before and after pushing this device 1 into the heat-softened thermoplastic resin tube 4, an annular groove is formed on the inner periphery of the expanded diameter part, as shown in Fig. 2. Different diameter tubes are obtained.

Further, according to FIG. 3-4, the mold device 1 is constructed almost the same as the mold device shown in FIGS. A groove 6 is provided.

Therefore, when the resin tube 4 is pushed in in the same manner as shown in FIGS. 1 and 2 after the ring 5 is engaged with the groove 6, the ring 5 is
A tube with different diameters is obtained, in which the tube is implanted on the inner periphery of the socket.

In such a process of forming pipes with different diameters, the ring groove formed on the inner periphery of the socket part is precisely regulated to a predetermined shape, or the ring 5 is
In order to securely plant the inside of the socket, a second
A method is adopted in which the outer diameters 7 as shown in FIGS.

However, when adopting such a method, it is necessary to select an outer mold 7 with a specific shape according to the shape of the annular groove and ring 5, and it is difficult to apply one outer mold to various mold devices. is impossible.

Therefore, in order to reduce the equipment cost of the entire mold equipment or simplify the work of replacing the outer mold, it is possible to create an outer mold that can be used in common for forming molds for manufacturing pipes with different diameters having many types of grooves and rings. Development of a mold is desired.

The present invention has been made by paying attention to the situation such as slanting, and its purpose is to form ring grooves of various shapes on the inner periphery of the open end of a pipe or to implant rings of various shapes. Therefore, it is an object of the present invention to provide a mold device that can reliably press and regulate the inner and outer surfaces of the mold, and particularly an outer mold that is effective for achieving this purpose.

Therefore, the structure of the present invention is composed of a core that regulates the inner surface shape of the tip of the opening of the tube, and an outer mold that regulates the outer shape of the tip of the opening, and the inner periphery of the outer mold is provided with tubes of different diameters. An elastic body is attached to the inner periphery of the outer mold that regulates the outer periphery of the different diameter part corresponding to the ring groove forming part or the implanted part of the annular body such as the seal retaining ring or stopper ring. This invention relates to a mold for forming pipes with different diameters, which is configured to freely deform according to the shape and press to regulate the inner and outer circumferences of the different diameter parts.

In the mold apparatus of the present invention, an elastic body is attached to the inner periphery of the outer mold disposed around the outer periphery of the different diameter portion so that it can be freely deformed according to the shape of the different diameter portion.

Therefore, when forming an annular groove of any shape on the inner periphery of a pipe, and when implanting a ring of any shape (including the ring shown in Fig. 3-4, for example), The molds are freely deformed according to their shapes and are pressed from the outer periphery.

Therefore, one outer mold can be used in common for manufacturing pipes of various shapes with different diameters, and the shape of the outer mold itself can be significantly simplified.

The configuration and effects of the present invention will be described below based on drawings serving as examples, but the following explanations are merely illustrative of typical embodiments of the present invention and do not limit the present invention.

5 to 8 are longitudinal cross-sectional views of essential parts illustrating the process of forming pipes of different diameters using the mold device of the present invention, and FIGS. Figures 7 and 8 show the process of forming the irregularly shaped ring, respectively.

In the present invention, the core 8 that is pushed into the inner periphery of the resin tube 4 to be processed into a different diameter is not essentially different from the mold device as explained in FIGS. Cores commonly used can be used.

However, on the inner periphery of the outer mold 7 used in the present invention, an elastic body 9 that can be freely deformed by compressive force is attached.

Therefore, when the outer mold 7 is pressed against the outer periphery of the different diameter part,
Since the elastic body 9 deforms according to the shape of the different diameter portion and compresses it evenly, the inner shape of the annular groove can be precisely regulated.
(Fig. 8) Alternatively, the ring 5 can be reliably implanted (Fig. 8).

By the way, when using a known outer diameter to regulate the inner and outer surfaces of a different diameter section, it is necessary to shape the inner surface of the outer mold according to the shape of the annular groove or ring, but in this example, Because the elastic body deforms appropriately according to the shape of the annular groove and ring,
There is no need to mold the inner surface of the outer mold according to the shape of the different diameter portion.

Further, as is clear from the above description, since the elastic body deforms depending on the shape of the different diameter portion, there is no problem even if one outer mold is applied to molding many types of different diameter portions.

Further, if the outer mold as shown in the figure is used, the outer periphery of the different diameter portion is evenly pressed and regulated, so that the phenomenon that a portion of the different diameter portion becomes locally thin can be prevented as much as possible.

As is clear from the above description, the main gist of the mold device of the present invention is that it is configured so that the outer periphery of the different diameter portion can be pressed and regulated by the outer mold equipped with the deformable elastic body 9 on the inner surface. Any other configuration may be used as long as the elastic body 9 can be freely deformed according to the shape of the different diameter portion.

That is, the structure of the core 8 that is pushed into the inner surface of the resin tube 4 is not limited to the structure shown in the figure, but can be expanded or contracted so that the diameter can be reduced after forming the different diameter portion and removed from the different diameter tube. Any structure may be used as long as it is configured as follows.

Therefore, by changing the shape of the outer circumferential portion of the thrust member 3, a ring groove of a desired shape can be formed, and rings 5 of various shapes other than those illustrated can be implanted.

Furthermore, the present invention can be advantageously applied to cases where a stopper ring for locking the end of an insertion tube is attached to the back of the tube socket.

When used to install the stopper ring, it is also possible to use a normal tampin that does not have a movable part as illustrated.

Although cores of various shapes and structures can be employed in the present invention as shown in the diagonal example, one type of outer mold can be used regardless of the shape and structure of the core, which is extremely convenient in practice.

The mold device of the present invention is configured in a diagonal manner, and the shapes of many types of pipes with different diameters can be reliably regulated with one outer mold. Complicated work such as replacement can be omitted, which is extremely advantageous from the viewpoint of simplifying molding work and reducing mold equipment costs.

Further, according to the present invention, the inner periphery of the different diameter portion can be accurately pressed and regulated according to the shape of the outer periphery of the core, and the outer periphery shape can be formed smoothly, among other advantages.

[Brief explanation of drawings]

The drawings are for explaining the present invention, and Figs. 1 to 4 are longitudinal sectional views of main parts explaining the process of manufacturing different diameter pipes using a known mold device, and Figs. 5 to 8 are molds according to the present invention. FIG. 2 is a vertical cross-sectional view of a main part explaining a process of manufacturing a pipe with different diameters using the apparatus. 1... Mold device, 2... Collapse member, 3... Thrust member, 4... Resin pipe, 5... Ring, 6... Concave groove, 7.
...outer mold, 8...core, 9...
Elastic body.

Claims (1)

[Claims] 1 It consists of a core that is inserted into the inner surface of the tip of the opening of the tube and regulates its inner shape, and an outer mold that is placed on the outer circumference of the tip of the opening and regulates its outer shape. In a mold device for forming a pipe of different diameters in which a groove is formed or an annular body such as a seal retaining ring or a stopper ring is implanted, an annular groove for the pipe of different diameters is formed on the inner periphery of the outer mold. A mold device for forming different diameter pipes, characterized in that an elastic body that can be freely deformed is attached to the outer layer of the different diameter part corresponding to the part, the packing engagement ring, or the stopper ring installation part. .