JPH0679803A - Manufacture of formed hose - Google Patents

Abstract

PURPOSE:To provide the efficient manufacturing method of a formed hose having connecting fittings at both its ends, by which the changing work of the fittings or the like can be omitted, since the connecting fittings mounted at forming can be used they as they are in product after forming, the predetermined bent shape can be formed without employing a mandrel and the inner surface layer has no wrinkle, since no mandrel is employed. CONSTITUTION:Vulcanized hose 1 is cut to necessary length for obtaining hose main body 1a. When the hose main body 1a is intended to be formed into the predetermined bend shape, connecting fittings 6a and 6b, both of which are to be clampingly installed to a product, are installed at both the ends of the cut hose main body 1a and, at the same time, a blank plug 7 is installed in advance in the fitting at one end. Under the state just mentioned above, pressurizing fluid with the predetermined pressure is encapsulated in the hose main body 1 so as to heat, shape and, after that, cool the main body, resulting in allowing to manufacture a formed hose without especially employing a mandrel or the like. In addition, the formed hose having the connecting fittings 6a and 6b at both its ends can be efficiently manufactured without development of wrinkle on its resin inner surface layer 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a molded hose, and more particularly to a molded hose which can efficiently manufacture a resin composite rubber hose for a refrigerant used in an automobile air conditioner or the like into a predetermined curved shape. The present invention relates to a manufacturing method.

[0002]

2. Description of the Related Art Conventionally, as a method of manufacturing a molded hose having a resin layer as the innermost layer, for example, a hose body having a mandrel inserted therein is sandwiched by an outer mold having a predetermined bending shape, shaped, and vulcanized. To form a predetermined shape, and as disclosed in JP-A-3-199033, a vulcanized or semi-vulcanized long hose body is cut into a predetermined length. When sandwiching this cut hose body in an outer mold with a predetermined bending shape for molding, put caps on both ends of the hose body to seal it, sandwich it in the outer mold, mold it, and then apply continuous pressure. The method of putting in a vulcanizer and vulcanizing was performed.

[0003]

However, when the hose body is modeled without using a mandrel like the latter, it is necessary to attach caps to both ends of the cut hose body. Further, it is necessary to attach a metal fitting for connection with another metal pipe to the product hose after being molded by caulking or the like. Further, when the molding shape is three-dimensional or has a complicated shape, it is difficult to assemble the metal fitting, which requires a lot of labor and time, and there is a problem in workability.

The present invention has been devised in view of such conventional problems, and the connecting metal fittings attached at the time of molding can be used as they are after the molding, and the work of exchanging the metal fittings can be omitted, and the mandrel can be omitted. To provide a method for manufacturing a molded hose that can be molded into a predetermined bent shape without using a mold, and that does not have a wrinkle on the inner resin layer because a mandrel is not used, and that can efficiently manufacture a molded hose with connecting fittings at both ends. The purpose is.

[0005]

In order to achieve the above-mentioned object, the present invention provides an elongated rubber member in which an intermediate rubber layer is provided on the outside of the innermost resin layer and an external rubber layer is laminated on the outside of the intermediate rubber layer via a reinforcing layer. After cutting the vulcanized hose to the required length, attach the connecting fittings to both ends of the hose body and attach a blind plug to one end of the hose to seal the hose body. After feeding pressurized air and sealing it, and heating this hose body to a predetermined temperature in the heating device,
It is sandwiched in an outer mold with a predetermined bending shape, molded, cooled in the molded state, and then the hose body is demolded to remove pressurized air from the hose body. The gist of the present invention is to manufacture a bent hose.

[0006]

According to the present invention, when the long vulcanized hose constructed as described above is cut to a required length and the hose body is formed into a predetermined curved shape, the metal fitting is caulked and mounted after the product. Pre-installed on both ends of the cut hose body, and in this state by enclosing a pressurized fluid of a predetermined pressure in the hose body to heat, mold and cool, without using a mandrel etc. A molded hose can be manufactured, and moreover, a molded hose having connecting fittings at both ends can be manufactured efficiently without causing wrinkles in the inner resin layer.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a vulcanization-molded hose 1, in which an intermediate rubber layer 3 of butyl rubber is provided on the outer side of an innermost resin layer 2 and chlorinated via a reinforcing layer 4 on the outer side thereof. An outer surface rubber layer 5 made of butyl rubber is laminated.

According to the present invention, when the hose 1 as described above is molded into a molded hose having a predetermined length, the hose 1 as described above is formed into an elongated shape, and the elongated vulcanized hose 1 is formed.
Is cut into a required length of hose body 1a as shown in FIG. After that, as shown in FIG. 3, the fittings 6a and 6b are caulked and attached to both ends of the hose body 1, and a blind plug 7 such as a blind nut is attached to the other end of the hose body 1a for sealing.

The connecting fittings 6a and 6b are those required for the final hose assembly, or those capable of connecting the finally used metal pipe and the hose body 1a. From the connecting fitting 6a on one end side of the hose body 1a configured as described above, a predetermined pressure (3 Kgf / cm ² ~
5 Kgf / cm ² ) of pressurized air is fed to seal and seal, or the fitting fitting having a self-sealing function, which is previously attached to the hose body 1a, is cut off. At this time, the inside of the hose body 1a is in a sealed state by applying a predetermined pressure.

Then, the hose body 1a is heated in a heating device (not shown) at a predetermined temperature for a predetermined time. In this embodiment, the temperature is above the softening point of the resin and below the melting point, and the time is 5 to 20 minutes. When the resin layer 2 is a polyamide resin, it is heated at 180 ° C to 200 ° C for 5 to 20 minutes. Next, the heated hose main body 1a is fitted into an outer mold 8 as shown in FIG. 4, for example, and molded at a constant temperature (for example, 10 ° C. to 15 ° C.) for a fixed time (for example, 5 to 20 ° C.).
Min) Cool. After that, the hose body 1a is released from the mold and the pressurized air is removed from the hose body 1a, whereby a molded hose having a predetermined bend shape can be manufactured.

As described above, in the present invention, when the vulcanized hose 1 is cut to a required length and the hose body 1a is formed into a predetermined bent shape, the connecting fittings 6a and 6b are caulked and mounted after the product. Is attached to both ends of the cut hose body 1a, and a blind plug 7 is attached to one end of the hose body 1a in advance. In this state, a pressurized fluid having a predetermined pressure is sealed in the hose body 1 to heat and mold, By cooling, it is possible to manufacture a molded hose without using a mandrel or the like, and furthermore, without causing wrinkles in the inner surface resin layer, connecting metal fittings 6 are provided at both ends.
The molded hose provided with a and 6b can be efficiently manufactured.

[0012]

As described above, the present invention provides a long vulcanized hose in which an intermediate rubber layer is provided on the outer side of the innermost resin layer and an outer rubber layer is laminated on the outer side of the intermediate rubber layer via a reinforcing layer. After cutting into pieces, attach fittings to both ends of the hose body, attach a blind plug to one end of the hose body to seal the hose body, and send pressurized air of a predetermined pressure into the hose body from the fitting piece on the other end side. After sealing and heating this hose body to a predetermined temperature in the heating device, it is sandwiched by an outer mold having a predetermined bending shape and molded, and after cooling in the molded state,
By removing the pressurized air from the hose body and removing the pressurized air from the hose body, a molded hose with a predetermined bent shape with connecting fittings at both ends is manufactured. It can be used as it is for other products, and the work of exchanging metal fittings during molding can be omitted,
In addition, it is possible to form into a predetermined bent shape without using a mandrel, and since the mandrel is not used, there is an effect that the inner surface resin layer has no wrinkles and a molded hose having connecting fittings at both ends can be efficiently manufactured.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a long vulcanized hose embodying the present invention.

FIG. 2 is a front view of a long vulcanized hose cut into a hose body having a required length.

FIG. 3 is a process diagram showing a state in which connecting fittings are attached to both ends of a hose body cut to a required length and blind plugs are attached to one end thereof.

FIG. 4 is an explanatory view showing a state in which connecting metal fittings are attached to both ends of the hose body, and a hose body having blind plugs attached to one end of the hose body is fitted into an outer mold and shaped.

[Explanation of symbols]

1 Vulcanized long hose 1a Hose body 2 Resin layer 3 Intermediate rubber layer 3 4 Reinforcing layer 5 Outer rubber layer 6a, 6b Connecting metal fitting 7 Blind plug 8 External type

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location B32B 25/10 F16L 11/08 A 7123-3J // B29K 21:00 105: 24 B29L 23:00 4F

Claims (1)

[Claims] 1. A long vulcanized hose in which an intermediate rubber layer is provided on the outer side of an innermost resin layer and an outer rubber layer is laminated on the outer side thereof through a reinforcing layer, and the long vulcanized hose is cut to a required length, and then the hose body is cut. Attach the connecting metal fittings to both ends of the hose, and attach a blind plug to one end of the hose to seal the hose body. After heating to a predetermined temperature in the device,
It is sandwiched in an outer mold with a predetermined bending shape, molded, cooled in the molded state, and then the hose body is demolded to remove pressurized air from the hose body. 1. A method for producing a molded hose, characterized in that the curved hose is manufactured.