JPH04339638A - Continuous manufacture of bent molded hose - Google Patents

Abstract

PURPOSE:To perform continuous molding operation without generating a distortion on a resin layer of the innermost layer at the time of molding, by a method wherein a material hose which has been vulcanized partly is inserted into an outer mold modeled beforehand by a fixed length and heating and main vulcanization are performed while pulling the tip by the outer mold. CONSTITUTION:After a material hose 1a is coated with an outer mold material comprised of a leaded material, partial vulcanization (semi-vulcanization) is performed. Then after peeling of the leaded material, after application of a mold release agent to an outer circumferential surface by a mold release agent applicator 12, the material hose 1a is inserted into a mold 9, which is provided with a heating device 8 and has been modeled beforehand, by a fixed length while pulling the tip of the material hose 1a by a string and heating and main vulcanization are performed. Then only a part where the main vulcanization has been completed is pulled out from the outer mold 9 and processes like these are performed repeatedly. Then the hose main body 1 is cut off corresponding to a desired length of the hose, a resin mandrel is pulled off from the hose main body 1 and the fixed bent molded hose main body 1 is manufactured.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a method for continuously manufacturing a bend-formed hose having a resin layer as the innermost layer, and more specifically, the invention relates to a method for continuously manufacturing a bend-formed hose having a resin layer as the innermost layer. This invention relates to a continuous manufacturing method for bend-formed hoses.

0002

[Prior Art] Conventionally, the structure of a molded hose with a resin layer as the innermost layer used for air conditioning piping of automobiles, etc. is such that on the outer peripheral surface of the resin layer, an intermediate rubber layer, a reinforcing thread layer, an outer rubber layer, etc. It is made of a composite material of resin and rubber, which is made by sequentially applying. By the way, conventional methods for manufacturing a bend-molded hose having a resin layer as the innermost layer include, for example, a manufacturing method in which a pre-curved inner mandrel is inserted into an unvulcanized hose, and a manufacturing method in which a split mold is used. A method of manufacturing a bent hose is known.

0003

[Problems to be Solved by the Invention] However, the method using the inner mandrel requires that the hose made of a composite material of resin and rubber, which has a resin layer as the innermost layer, be in an unvulcanized state at the time of molding. Alternatively, if the partially vulcanized (semi-vulcanized) state is inserted into a curved mandrel that has been curved in advance and vulcanization is performed, the curved inner side will be compressed and wrinkles will occur in the resin layer. especially,
If there is a gap between the inner diameter of the unvulcanized raw pipe and the outer diameter of the bent mandrel, there is a problem that wrinkles will occur on the bent inner surface of the resin layer due to shrinkage of the reinforcing thread layer during vulcanization. The wall thickness was not adequate, which caused problems with product accuracy.

[0004] Furthermore, the method of manufacturing a curved hose using a split mold has the problem that wrinkles occur on the bent inner surface of the resin layer as described above, making the wall thickness uneven, and the mold There were problems in that it was difficult to match, the mold seams appeared on the outside of the hose, worsening its appearance, and workability was poor. If there are wrinkles in a part (inside) of the resin layer as described above, internal stress concentrates in the wrinkled area, which not only reduces the durability of the molded hose but also leads to a decrease in quality. was there.

[0005] Furthermore, in the case of the above manufacturing method,
Molding can only be done one by one (i.e., batch processing), making it impossible to improve productivity. In addition, cutting waste is generated because the end of the hose body is processed, i.e., the terminal part is cut. However, the process was complicated.

[0006]

[Purpose of the Invention] This invention was devised by focusing on the above-mentioned conventional problems, and it is possible to efficiently mold the innermost resin layer without wrinkles or uneven thickness during molding. It is an object of the present invention to provide a continuous manufacturing method for bend-formed hoses that can perform continuous molding work, improve productivity, improve quality accuracy, and further improve durability. This is the purpose.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the present invention extrudes an inner resin layer onto a resin mandrel, and on the outer peripheral surface of this resin layer, an intermediate rubber layer, a reinforcing thread layer or a reinforcing wire layer, and an outer surface. Rubber layers are sequentially applied to form an unvulcanized raw hose, and after coating this raw hose with an outer mold material made of leaded material, partial vulcanization or main vulcanization is performed to remove the outer mold material. After peeling off, a mold release agent is applied to the outer circumferential surface, and this partially vulcanized raw hose is inserted for a predetermined length into an outer mold equipped with a heating means and pre-shaped while pulling the tip and heated. After the main vulcanization is performed, only the part that has been completely vulcanized is pulled out from the outer mold using a pulling device, and this process is repeated, and the main vulcanization is removed using a cutting device according to the required length of the hose. The gist of this method is to cut the hose body in which the sulfur has been removed, pull out the resin mandrel from the hose body, and continuously manufacture a bent hose body in a predetermined shape.

[0008]

Effect of the Invention The present invention is constructed as described above, and an inner resin layer consisting of a hollow or solid reusable resin mandrel and an inner tube is extruded simultaneously or continuously, and the outer periphery of this resin layer is extruded. An intermediate rubber layer of a predetermined thickness is extruded onto the surface. After forming a reinforcing yarn layer or a reinforcing wire layer made of braid, spiral, or knit on the outer peripheral surface of this intermediate rubber layer, outer rubber layers are sequentially applied to form an unvulcanized raw tube hose.

[0009] After coating this raw hose with an outer mold material made of a leaded material, partial vulcanization is performed, and after the outer mold material is peeled off, a pipe-shaped or segmented material, which is equipped with a heating means and has been molded in advance, is heated. Insert the tip of the partially vulcanized raw pipe hose into the molded outer mold for a predetermined length while pulling it, perform main vulcanization in this state, and after the main vulcanization is completed, only the part that has been main vulcanized is inserted. By pulling out the resin hose with a pulling device, repeating this operation, and performing continuous vulcanization molding, it is possible to improve productivity compared to the conventional manufacturing of one piece at a time. It is possible to manufacture a bent hose main body having a predetermined shape without wrinkles in the innermost resin layer, which is the most important layer, and without uneven thickness.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partially cutaway perspective view of a molded hose body 1 embodying the present invention, and FIG. 2 is a sectional view taken along line A-A of the molded hose body 1.
A flexible resin mandrel 2 with a predetermined diameter made of polymethyl pentene resin, etc. is coated with an inner resin layer 3, an intermediate rubber layer 4, and a reinforcing thread layer or reinforcement made of spiral, braided, knitted, etc. wire layer 5
are sequentially applied, and the outer surface thereof is covered with an outer surface rubber layer 6.

[0011] The method for manufacturing such a molded hose body 1 includes forming a hollow or solid reusable resin mandrel 2 made of polymethyl pentene resin, etc., and an inner resin layer 3 that will become an inner tube on the outer peripheral surface of the mandrel. extrude simultaneously or sequentially. Then, an intermediate rubber layer 4 of a predetermined thickness is extruded onto the outer peripheral surface of this inner resin layer 3, and a reinforcing thread layer or reinforcing wire layer made of braid, spiral, or knit is further applied to the outer peripheral surface of the intermediate rubber layer 4. After forming, an outer rubber layer 6 is sequentially applied to form an unvulcanized raw hose 1a.

After this raw hose 1a is coated with an outer mold material 7 made of a leaded material, partial vulcanization (semi-vulcanization) is performed. After peeling off the outer mold material 7, as shown in FIG.
As shown in FIG. 2, after a mold release agent is applied to the outer circumferential surface by a mold release agent coating device 12, it is placed in a pipe-shaped or divided outer mold 9 which is equipped with a heating means 8 on the outer peripheral surface or inside and is molded in advance. As shown in FIG. 4, the tip of the raw hose 1a is pulled by a string or the like and inserted for a predetermined length to perform heating and main vulcanization.

After the main vulcanization is completed, only the part L that has been completely vulcanized is removed from the outer mold 9 using a drawing device 10 as shown in FIG.
Pull it out and repeat this process. Then, as shown in FIG. 6, the main vulcanized hose body 1 is cut by a cutting device 11 provided at the tip of the outer mold 9 according to the required length of the hose (see FIG. ), the resin mandrel 2 is pulled out from the hose body 1 to produce a bent hose body 1 of a predetermined shape (FIG. 8).

[0014] When inserting the raw hose 1a into the outer mold 9 equipped with the heating means 8, the hose 1a may be heated as necessary.
That is, the resin mandrel 2 is heated at about 100° C. for about 5 minutes to the extent that it becomes soft, so that it can be easily inserted, and the resin mandrel 2 is inserted while being pulled into the outer mold 9 that has been molded in advance for main vulcanization. I do. In addition, when the raw hose 1a is in an unvulcanized state, main vulcanization is performed, but if the main vulcanization has already been carried out, it is sufficient to perform only cursing heating.

By continuously manufacturing bent hose bodies of a predetermined shape by such a method, it is possible to continuously mold a molded hose of a predetermined length, and therefore productivity can be significantly improved, and the resin mandrel 2 Since the molding is performed without creating a gap between the inner resin layer 3 and the inner resin layer 3, there are no wrinkles in the inner resin layer 3, and there is no uneven thickness, making it possible to efficiently manufacture products with high precision. .

[0016]

[Effects of the Invention] The present invention extrudes an inner resin layer onto a resin mandrel as described above, and on the outer peripheral surface of this resin layer,
After sequentially applying an intermediate rubber layer, a reinforcing thread layer or a reinforcing wire layer, and an outer rubber layer to form an unvulcanized raw hose, and covering this raw hose with an outer mold material made of leaded material,
After performing partial vulcanization or main vulcanization and peeling off the outer mold material, a mold release agent is applied to the outer circumferential surface, and this partially vulcanized raw pipe hose is heated and molded in a pre-shaped outer mold. After inserting it into the mold for a predetermined length while pulling the tip, heating and main vulcanization are performed, only the part that has been completely vulcanized is pulled out from the outer mold using a pulling device, and this process is repeated to create the required material. The main vulcanized hose body is cut by a cutting device according to the length of the hose to be used, and the resin mandrel is pulled out from this hose body to continuously manufacture bent hose bodies of a predetermined shape. It has such excellent effects. (a). Since the resin mandrel and the inner resin layer are bent and vulcanized with no gap between them, the inner resin layer does not have wrinkles and can be formed without eccentricity, thereby reducing stress concentration, etc. Since this problem can also be prevented, the durability and quality accuracy of the hose can be significantly improved. (b). Since the molded hose can be continuously molded, productivity can be significantly improved, the inner surface will not get dirty, and moreover, it can be manufactured efficiently without generating waste due to end treatment. (c). Also, since we do not use split molds like in the past,
Productivity and workability are good, and the appearance of the hose body can also be improved. (d). Since unvulcanized hoses are automatically inserted and vulcanized hoses are cut off, work efficiency can be increased without requiring much effort and time.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of a molded hose body embodying the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG. 1;

FIGS. 3 to 8 are explanatory diagrams showing the forming process of the continuous manufacturing method of a bend-formed hose of the present invention.

[Explanation of symbols]

1 Molded hose body,
1a Raw pipe hose 2 Resin mandrel
3 Inner surface resin layer 4 Intermediate rubber layer 5 Reinforcing yarn layer or reinforcing wire layer 6 Outer surface rubber layer 7 Outer mold material made of leaded material
8 Heating means 9 Outer mold
10 Pulling device 11 Cutting device.

Claims (1)

[Claims] Claim 1: An unvulcanized raw tube hose is obtained by extruding an inner resin layer onto a resin mandrel, and sequentially applying an intermediate rubber layer, a reinforcing thread layer or reinforcing wire layer, and an outer rubber layer to the outer peripheral surface of this resin layer. After coating this raw hose with an outer mold material made of leaded material, partial vulcanization or main vulcanization is performed, and after peeling off the outer mold material, a mold release agent is applied to the outer peripheral surface. This partially vulcanized raw hose is inserted for a predetermined length into an outer mold that is equipped with a heating means and has been molded in advance while pulling the tip, heated and fully cured, and then is fully vulcanized using a drawing device. Only the part where the vulcanization has been completed is pulled out from the outer mold, this process is repeated, and the hose body which has been fully vulcanized is cut using a cutting device according to the required length of the hose, and the hose body is cut from the hose body. A continuous manufacturing method for a curved hose, characterized by continuously manufacturing curved hose bodies of a predetermined shape by pulling out a resin mandrel.