JPS649922B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a method for manufacturing a bent rubber hose of different diameters, such as a water hose for an automobile, in which a single rubber hose has partially different pipe diameters, and is also a bent pipe. It is related to.

Bent rubber hoses with different diameters are useful as connecting pipes. The conventional method for producing bent rubber hoses of different diameters is to extrapolate unvulcanized rubber onto a core rod with a predetermined curved shape, wrap cloth around only the narrow part of the pipe, and then vulcanize it. , by the time-consuming method of pulling out the core rod after unraveling the cloth, or, if a more complicated shape with a different diameter is required, by molding using a split mold 10 as shown in FIG. I didn't get it. However, when molding a three-dimensionally bent shape such as a curved rubber hose with a different diameter as shown in Figure 4, the mold method requires a complicated mold shape, increases the size of the mold, and is difficult to implement. It's not easy. In addition, the problem of burrs occurring on the surface of the molded product, which is a common drawback of molded products using metal molds, requires labor for processing after deburring and must be solved in order to increase the commercial value.

The present invention solves the problems in manufacturing bent hoses of different diameters. In particular, according to the present invention, it is easy to manufacture curved rubber hoses of various shapes with different diameters, and the obtained products do not require deburring, etc., and can be easily manufactured without requiring installation space or parts, as seen in automobile water hoses. The manufacturing method of the present invention is effective when a large number of bent rubber hoses of different diameters need to be standardized and produced for the purpose of standardization or the like.

The features of the present invention are as follows. In other words, when manufacturing a curved rubber hose with different diameters in which a single rubber hose has partially different pipe diameters and is a curved pipe, an unvulcanized rubber hose is inserted into a metal core rod having a predetermined different diameter and curved shape. In this method, a tubular rubber cap made of a flexible material such as vulcanized rubber is pressed into the outer circumferential surface of an unvulcanized rubber hose, and is vulcanized and molded to fit the shape of the curved portion with a different diameter.

This will be explained in detail below with reference to the drawings.

FIG. 1 is a partially cutaway front view of necessary members for explaining an embodiment of the present invention. FIG. 2A is a central vertical cross-sectional view of the state in which the unvulcanized rubber hose is inserted into the core rod, and FIG. 2B is the state in which the tubular rubber cap is further inserted. FIG. 3 is a partially cutaway front view of the product, a curved rubber hose with different diameters. FIG. 4A is a partially cutaway front view showing another embodiment, and FIG. 4B is a side view of the obtained curved rubber hose of different diameters. FIG. 5 is a plan view of a conventional split mold.

The method of manufacturing a curved rubber hose of different diameters of the present invention is clear from these figures, but first, a metal core rod 1 of a required shape, that is, a different diameter and curved shape of the product, is prepared. This metal core rod 1 may have a complicated shape bent in three or more ways, or the outer diameter of the core rod 1 may start from a thick part and become thinner in stages, or the outer diameter of the core rod 1 may be irregularly formed with thick and thin parts. I don't mind.

Next, an unvulcanized rubber hose 2 is extrapolated onto the metal core rod 1 having a bent shape with a different diameter, as shown in FIG. 2A. When extrapolating, using a mold release agent such as lubricating oil makes it easier to insert the core rod 1 and to release the mold after molding. The inner diameter of the unvulcanized rubber hose 2 may be approximately the same as the outer diameter of the metal core rod 1.

After the unvulcanized rubber hose 2 is inserted onto the core rod 1 in this way, the tubular rubber cap 3, which is the most distinctive feature of the present invention, is then inserted onto the unvulcanized rubber hose 2 as shown in FIG. extrapolate. When extrapolating, it is preferable to use a mold release agent as described above. This tubular rubber cap 3, which is adapted to the shape of the curved portion having a different diameter, can properly straighten the unvulcanized rubber hose 2 inside. The material of the tubular rubber cap 3 is preferably vulcanized rubber elastic material 4 for curved portions, and vulcanized rubber elastic material 4 for straight portions as shown in Fig. 4A.
It is preferable that a metal pipe rigid body 5 made of aluminum or the like is fitted around the outer periphery of the pipe.

After the metal core rod 1, unvulcanized rubber hose 2, and tubular rubber cap 3 are integrated as described above, vulcanization is performed using a conventional method. After vulcanization and molding, the tubular rubber cap core rod is removed to obtain the product. The bent rubber hose 6 of different diameter thus obtained is the third
As shown in the figure, it has a predetermined bent shape with different diameters, and furthermore, the bent rubber hose 6 with different diameters bent three-dimensionally as shown in FIG. 4B can be easily obtained.

The present invention is a manufacturing method as described above, which does not take much time and effort as in the case of using a split mold, significantly improves manufacturing efficiency, and does not require as much cost as in the case of mold manufacturing. In addition, there is no need to deburr the obtained product,
The finish is good.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view of necessary members for explaining the embodiment. Figures 2A and 2B are central vertical sectional views. FIG. 3 is a partially cutaway front view of the curved rubber hose with different diameters. FIG. 4A is a partially cutaway front view showing another embodiment, and FIG. 4B is a side view of the obtained curved rubber hose of different diameters. FIG. 5 is a plan view of a conventional split mold. 1...Metal core rod, 2...Unvulcanized rubber hose,
3... Tubular rubber cap, 4... Vulcanized rubber elastic body, 5... Metal pipe rigid body, 6... Different diameter bent rubber hose.

Claims (1)

[Claims] 1 A single rubber hose has partially different pipe diameters,
In addition, when manufacturing a curved rubber hose with different diameters, an unvulcanized rubber hose is inserted into a metal core rod with a predetermined different diameter and curved shape, and a vulcanized rubber etc. A method for manufacturing a curved rubber hose of different diameters, which comprises pressing a tubular rubber cap made of a flexible material into the outer peripheral surface of an unvulcanized rubber hose and vulcanizing it.