JPH05301282A - Mandrel and continuous manufacturing method for molded hose for which the mandrel is used - Google Patents

Abstract

PURPOSE:To constitute a method so that an improvement in productivity can be contrived by a mandrel which can be used repeatedly as it is even if molded hoses are manufactured continuously and the molded hoses are manufactured continuously by making use of the mandrel. CONSTITUTION:The mandrel is obtained by providing a detachable joining member 4 for mutual joining of both ends of columner mandrel main body 2 having flexibility on both the ends of the mandrel main body 2. Then mandrels 1 are connected with each other through the joining member 4 by inserting the mandrels 1 into a plurality of vulcanized hoses 10 which are cut into fixed pieces, the vulcanized hose 10 is heated, embossed and cooled by pulling the mandrel at every fixed length and processes are applied repeatedly in order to the vulcanized hose 10 of the connected mandrel 1, through which a molded hose is manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mandrel and a method for continuously manufacturing a molded hose using the mandrel, and more particularly, a molded hose having a predetermined bending shape using mutually detachable mandrels. The present invention relates to a mandrel capable of continuously manufacturing and a continuous manufacturing method of a molded hose using the mandrel.

[0002]

2. Description of the Related Art Conventionally, various methods have been proposed as a method for producing a molded hose having a predetermined bending shape.
For example, the following method is known for fitting a hose into an outer mold for molding and molding the hose. a). Forming a long unvulcanized hose on a long flexible mandrel, cutting it into a required length, and inserting each into an outer mold having a required bending shape, A method for producing a molded hose having a predetermined bending shape by performing vulcanization molding.

B). By inserting a flexible mandrel into an unvulcanized hose cut into a predetermined length and fitting each mandrel into a predetermined molding outer mold to vulcanize and mold the hose. , A method for producing a molded hose having a predetermined bending shape. As the mandrel used in the above method, there is known a mandrel made of a flexible material such as rubber or resin and having a cylindrical shape corresponding to the inner diameter of the molded hose.

[0004]

[Problems to be Solved by the Invention]
In the case of method a), the long mandrel is cut to the length of the molding hose, so it cannot be used repeatedly, and it costs too much to regenerate the long mandrel. However, there is a problem that the manufacturing cost of the product increases.

Further, in both the methods a) and b), since the hose itself is in an unvulcanized state, rubber blowout, scratches, etc. may occur on the surface of the molded hose vulcanized and molded into a predetermined bent shape. The rubber hose is apt to occur, the bent portion is likely to be flat, and in the case of a rubber hose having a resin layer on the inner surface, there is a problem that wrinkles occur in the resin layer at the bent portion. In addition, both methods are batch methods, and since vulcanization molding is performed after inserting each one into the outer mold, there is a problem that productivity is extremely low.

The present invention has been devised in view of the above-mentioned conventional problems, and by using a vulcanized hose for molding, secondary vulcanization is unnecessary and a molded hose can be continuously formed. Manufacture to improve productivity, prevent scratches on the surface of the molded hose, and prevent flattened bends.
In the case of a molded hose with a resin layer on the inner surface, it is possible to effectively prevent wrinkles from forming in the resin layer at the bent portion, and the mandrel can be used repeatedly as it is even when continuously manufacturing molded hoses. Another object of the present invention is to provide a continuous method for producing a molded hose using the mandrel.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is detachable for connecting terminal portions of a mandrel body to both ends of a flexible cylindrical mandrel body. The gist is that a connection member is provided. Also, insert a mandrel into each of a plurality of vulcanized hoses cut to a predetermined length, and with the connecting members provided at both ends of the mandrel engaged in a disengageable manner, remove the leading end of the mandrel. After inserting the vulcanized hose into the heating means and heating it at the specified temperature for the specified time, pull the mandrel at the beginning for a specified length and heat the vulcanized hose into a molding outer mold corresponding to the specified bending shape. Insert and cool at a predetermined temperature for a predetermined time, after cooling, pull out the molding hose from the molding outer mold by pulling the front mandrel for a predetermined length, while pulling the mandrel at a predetermined pitch, heat, mold,
The gist is to manufacture a molded hose by sequentially repeating cooling.

[0008]

Since the present invention is constructed as described above and the end portions of the mandrels can be engaged and disengaged with each other, the mandrels can be easily contacted and separated from each other even when continuously manufacturing the molded hose. It can be used repeatedly without cutting the mandrel.

In addition, mandrels are inserted into a plurality of vulcanized hoses cut into a predetermined length, and connecting members provided at both ends of the mandrels are detachably engaged, After inserting the vulcanized hose at the beginning into the heating means and heating it at a specified temperature for a specified time, pull the mandrel located at the beginning for a specified length to mold the heated vulcanized hose to the specified bending shape. Inserted in an outer mold and cooled at a predetermined temperature for a predetermined time, after cooling, pull out the molding hose from the molding outer mold by pulling the leading mandrel for a predetermined length, pulling the mandrel at a predetermined pitch, and vulcanized hose Since the molding hose is manufactured by sequentially repeating heating, molding, and cooling, the surface of the molding hose is not scratched, and wrinkles are effectively prevented from occurring in the molding hose having a resin layer on the inner surface. , Molding It can be produced continuously over the nest.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a cross-sectional view of a mandrel according to the present invention. The mandrel 1 has a flexible mandrel main body 2 made of rubber, resin, or the like. A flexible core wire 3 passing through the central axis X-X is provided.

The core wire 3 is made of steel wire or the like and projects from both end surfaces 2a and 2b of the end portion of the mandrel body 2.
When the connecting member 4 supplements the protruding portion 3a of the core wire 3, the core wire 3 can be fixed to the connecting member 4 through the central axis XX, that is, the mandrel. It is necessary to expose at least from both end surfaces 2a and 2b of the terminal portion of the main body 2.

At both ends 3b, 3c of the core wire 3, a detachable connecting member 4 for connecting the terminal portions of the mandrel body 2 to each other is fixed. That is, by engaging the connecting members 4 of the adjacent mandrels 1 with each other, the mandrels 1 (mandrel body 2) are connected to each other. The connecting member 4 is made of a metal fitting or the like and has a mouth portion 4a for engaging and disengaging each other. At the time of use, the connecting members 4 are engaged with each other through the mouth portions 4a, and the engaging portions 4b are engaged with each other. Therefore, the shape of the connecting member 4 is not particularly limited as long as it can be engaged.

The connecting member 4 can pass through the inside of the hose to be used, that is, the maximum width L thereof is smaller than the inner diameter of the molded hose. Thereby, when inserting the mandrel 1 into the hose, the inner surface of the hose is not damaged by the connecting member 4. By thus providing the mandrel 1 with the connecting member 4 so that the mandrel 1 can be engaged and disengaged with each other, the mandrel 1 can be easily contacted and separated even when continuously manufacturing the molded hose. It is possible to repeatedly use 1 without cutting it.

Next, a method for continuously manufacturing a molded hose using the mandrel 1 having the above structure will be described with reference to FIG. First, a long vulcanized hose is manufactured by a method similar to the conventional method, and the long vulcanized hose is manufactured as shown in FIG. 2 (a). The vulcanized hose 10 is cut, and the mandrel 1 having a length corresponding to the length of the vulcanized hose 10 is inserted into each of the cut vulcanized hoses 10 as shown in FIG. 2B. .. Then, as shown in FIG. 2 (c), the vulcanized hose 10
The mandrels 1 inserted in the above are connected by a connecting member 4.

Then, as shown in FIG. 2 (d), the leading mandrel 1A of the connected mandrel 1 is pulled for a predetermined length to insert the leading vulcanized hose 10A into the heating means 20, and from the direction of the arrow. The heating medium is circulated and heated at a predetermined temperature for a predetermined time. After heating, as shown in FIG. 2 (e), the vulcanized hose 10A heated by pulling the mandrel 1A for a predetermined length is placed on a molding outer die 40 provided in the cooling means 30 and having a predetermined bending shape. After being inserted, a cooling medium such as water is circulated in the direction of the arrow to cool at a predetermined temperature for a predetermined time. At this time,
The next mandrel 1B is pulled together with the leading mandrel 1A, the next vulcanized hose 10B is drawn into the heating means 20, and is heated at a predetermined temperature for a predetermined time. Therefore, the heating time and the cooling time are the same in this case. After cooling the vulcanized hose 10A, as shown in FIG. 2 (f), the mandrel 1A is pulled by a predetermined length and cooled from the outer mold 40 to take out the molded hose 11 molded. At this time, the heated vulcanized hose 10B is inserted into the molding outer mold 40 of the cooling means 30, and the next mandrel 1C is pulled together with the mandrel 1B connected to the leading mandrel 1A, and the next vulcanization is performed. The finished hose 10C is drawn into the heating means 20. Then, the vulcanized hose 10B is cooled at a predetermined temperature for a predetermined time, and the vulcanized hose 10C is heated at a predetermined temperature for a predetermined time.

Since the mandrel 1 is connected,
The vulcanized hose 10 into which the mandrel 1 is inserted is successively drawn into the cooling means 30 provided with the heating means 20 and the molding die 40 for molding as described above, and heating, molding and cooling are sequentially repeated. That is, the molded hose 11 is continuously manufactured. Then, the mandrel 1 of the molding hose 11 that has been drawn out from the cooling means 30 and completed the molding is separated, and the mandrel 1 can be pulled out from the molding hose 11 to obtain the molding hose 11. It is possible to manufacture the molded hose 11 by successively pulling out the molded hose 11 molded from the cooling means 30 and removing the mandrel 1 one by one at predetermined time intervals.

This prevents scratches and the like from occurring on the surface of the molded hose 11 and, in a molded hose having a resin layer on the inner surface, effectively prevents wrinkles in the resin layer at the bent portion. In addition, the molded hose 11 can be continuously manufactured to improve the productivity. Further, since the molded hose 11 is manufactured by using the vulcanized hose 10, the end of the molded hose 11 is not deteriorated, cutting finish is unnecessary, and terminal cutting waste is also eliminated.

The heating time and the cooling time do not have to be the same as described above, but can be changed by the structure of the heating means 20 and the outer mold 40 provided in the cooling means 30. Further, the cooling means 30 is used to separate the mandrel 1 and remove the mandrel 1 from the molding hose 11.
It may be carried out for each molding hose 11 taken out from the molding hose, or may be carried out after the molding is completed.

In FIG. 2, the bending angle of the molded hose 11 is 90.
Although the outer mold 40 having a bending angle of 180 ° is shown, the outer mold 40 having a bending angle of 180 ° may be used as shown in FIG. May be. Next, the method for continuously producing a molded hose having a resin layer as the innermost layer and a molded hose made of a normal rubber hose will be described in more detail. 1. Example A A long unvulcanized hose was vulcanized and formed at 154 ° C. for 60 minutes and then cut into 350 mm to obtain a plurality of vulcanized hoses 10 having a predetermined length. As shown in FIG. 4, the vulcanized hose 10 has a resin layer made of nylon resin on the innermost layer 12 and a wall thickness of 0.18 mm, and an intermediate rubber layer 13 and a reinforcing layer on the outer side thereof. The outermost layer 15 is disposed via 14. The intermediate rubber layer 13 is made of butyl rubber, the outermost layer 15 is made of butyl chloride rubber, and the reinforcing layer 14 is made of a reinforcing cord made of polyester fiber. The vulcanized hose 10 had an inner diameter of 15.0 mm and an outer diameter of 23.0 mm.

Next, the mandrel 1 provided with the connecting member 4 was inserted into each of the plurality of vulcanized hoses 10, and the mandrels 1 were continuously connected to each other. At this time, the difference between the inner diameter of the vulcanized hose 10 and the outer diameter of the mandrel 1 is preferably 1.0 mm or less in order to prevent wrinkles in the resin layer of the innermost layer 12 during bending. That is, the vulcanized hose 10
Since the inner diameter of the mandrel 1 is 15.0 mm, the outer diameter of the mandrel 1 is 14.0 mm or more and less than 15.0 mm. In the bending process, when manufacturing the molded hose 11 having a bending radius of 50 mm or less, the difference between the inner diameter of the vulcanized hose 10 and the outer diameter of the mandrel 1 is preferably 0.2 to 0.5 mm.

Next, the leading mandrel 1A was pulled for a predetermined length to draw the leading vulcanized hose 10A into the heating means 20 and heated at 190 ° C. for 20 minutes. After heating, the leading mandrel 1A is pulled again by a predetermined length, and the leading vulcanized hose 10A is drawn into the outer mold 40 of the cooling means 30 having a bending angle of 180 ° as shown in FIG. 20
It was cooled for a minute.

After cooling, the mandrel 1A is pulled again by a predetermined length to form a molded hose 11 molded into a predetermined bent shape.
Is taken out from the molding outer mold 40 of the cooling means 30, the mandrel 1A is cut off, and then the mandrel 1A is molded into the molding hose 11
To obtain a molded hose 11. When the leading mandrel 1A is pulled and the vulcanized hose 10a is drawn into the cooling means 30, the next mandrel 1B is pulled by a predetermined length and the next vulcanized hose 10B enters the heating means 20, Similarly, when the molded mandrel 1A is heated for 20 minutes at 190 ° C. and the molded hose 11 is taken out from the cooling means 30, the next vulcanized hose 10
B is inserted into the outer mold 40 of the cooling means 30 and cooled, and the next vulcanized hose 10C is drawn into the heating means 20 and heated as described above, and the mandrel 1 is removed every 20 minutes. The molded hose 11 could be obtained one after another by pulling it for a predetermined length. The molded hose 11 had a good appearance without scratches on the surface, and was good without flattening of the bent portion and wrinkling of the resin layer. 2. Example B A long unvulcanized hose was vulcanized and formed at 154 ° C. for 60 minutes and then cut into 350 mm to obtain a plurality of vulcanized hoses 10 having a predetermined length. As shown in FIG. 5, the structure of the vulcanized hose 10 includes the outermost layer 1 with the innermost layer 16 and the reinforcing layer 17 interposed therebetween.
8 are arranged. The innermost layer 16 and the outermost layer 18 are made of butyl rubber having a compression set of 150% at 70 ° C. for 70 hours, and the reinforcing layer 14 is made of a reinforcing cord made of polyester fiber. The vulcanized hose 10 had an inner diameter of 15.0 mm and an outer diameter of 23.0 mm.

Next, the mandrel 1 provided with the connecting member 4 was inserted into each of the vulcanized hoses 10, and the mandrels 1 were continuously connected to each other. At this time, in order to prevent flattening of the innermost layer 16 during bending, the difference between the inner diameter of the vulcanized hose 10 and the outer diameter of the mandrel 1 is preferably 2.0 mm or less. That is, since the inner diameter of the vulcanized hose 10 is 15.0 mm, the outer diameter of the mandrel 1 is 13.0 mm or more and 15.0 mm or more.
It is less than mm.

Next, the leading mandrel 1A was pulled for a predetermined length, the leading vulcanized hose 10A was drawn into the heating means 20, and heated at 190 ° C. for 20 minutes. After heating, the leading mandrel 1A is pulled again by a predetermined length to draw the leading vulcanized hose 10A into the outer mold 40 of the cooling means 30 having a bending angle of 180 ° as shown in FIG. Cooled at 10 ° C for 20 minutes.

After cooling, the mandrel 1A is pulled again by a predetermined length, and the molded hose 11 is molded into a predetermined bent shape.
Is taken out from the molding outer mold 40 of the cooling means 30, the mandrel 1A is cut off, and then the mandrel 1A is molded into the molding hose 11
To obtain a molded hose 11. Similarly to the above, when the leading mandrel 1A is pulled and the vulcanized hose 10a is drawn into the cooling means 30, the next mandrel 1B is pulled by a predetermined length and the next vulcanized hose 10B is heated by the heating means 20. Similarly, when the mandrel 1A at the head is pulled and the molded hose 11 is taken out from the cooling means 30, the next vulcanized hose 10B is cooled by the cooling means 30. Is cooled by being inserted into the molding outer mold 40 of FIG. 1, and the next vulcanized hose 10C is drawn into the heating means 20 for heating, and the mandrel 1 is pulled for a predetermined length every 20 minutes to successively mold the hose. 11
I was able to get The molded hose 11 had a good appearance with no scratches on the surface and a good flatness of the bent portion.

As described above, the present invention is based on the mandrel 1
By providing the connecting member 4 to the mandrel 1 so that the mandrels 1 can be engaged with and disengaged from each other, the mandrel 1 can be easily connected and disconnected even when the molded hose 11 is continuously manufactured. It can be used repeatedly without cutting. Further, the vulcanized hose 10 cut to a predetermined length is connected via the mandrel 1, and sequentially heated, molded, and cooled to form the outer mold 40.
The molded hose 11 can be continuously manufactured since it is taken out from the mold.

[0027]

The present invention is constructed as described above, and by providing the connecting member on the mandrel so that the mandrels can be engaged with and disengaged from each other, the mandrel can be easily manufactured even in the case of continuously producing the molded hose. To and from
The mandrel can be repeatedly used as it is without cutting, and there is an effect that the manufacturing cost of the molded hose can be kept low without incurring the cost of remanufacturing the mandrel.

Further, mandrels are respectively inserted into a plurality of vulcanized hoses cut into a predetermined length, and connecting members provided at both ends of the mandrels are engaged and disengageable, After inserting the vulcanized hose at the beginning into the heating means and heating it at a specified temperature for a specified time, pull the mandrel located at the beginning for a specified length to mold the heated vulcanized hose to the specified bending shape. Inserted in an outer mold and cooled at a predetermined temperature for a predetermined time, after cooling, pull out the molding hose from the molding outer mold by pulling the leading mandrel for a predetermined length, pulling the mandrel at a predetermined pitch, and vulcanized hose Molded hose is manufactured by sequentially repeating heating, molding and cooling, so by using a vulcanized hose to mold it, secondary vulcanization is not required and a molded hose is continuously manufactured and produced. sex In addition to being able to improve, it prevents scratches and the like on the surface of the molded hose and flattening of the bent portion, and in the case of a molded hose having a resin layer on the inner surface, wrinkles in the resin layer at the bent portion occur. Can be effectively prevented, and there is an effect that a good molded hose with high product accuracy can always be obtained. Furthermore, since a molded hose is manufactured using a vulcanized hose, deterioration of the end of the molded hose can be prevented, and there is an effect that the molded hose can be manufactured inexpensively without cutting the end. is there.

[Brief description of drawings]

FIG. 1 is a sectional view of a mandrel according to the present invention.

FIG. 2 is a process diagram illustrating a continuous method for manufacturing a molded hose.

FIG. 3 is an explanatory view of another outer molding die.

FIG. 4 is an explanatory diagram showing the configuration of a molded hose having a resin layer as the innermost layer.

FIG. 5 is an explanatory view showing the structure of a usual molded hose whose innermost layer is a rubber layer.

[Explanation of symbols]

1 Mandrel 1A Leading mandrel 2 Mandrel body 2a, 2b Both end faces of mandrel 3 Core wires 3a, 3b Both ends of core wire 4 Connection member 10 Vulcanized hose 10A Lead vulcanized hose 11 Molded hose 12, 16 Innermost layer 13 Intermediate Layers 14 and 17 Reinforcing layers 15 and 18 Outermost layer 20 Heating means 30 Cooling means 40 External mold

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Claims (4)

[Claims] 1. A mandrel having a flexible columnar mandrel body, at each end of which a detachable connecting member is provided for connecting terminal portions of the mandrel body to each other. 2. A mandrel is inserted into each of a plurality of vulcanized hoses cut into a predetermined length, and connecting members provided at both ends of the mandrel are detachably engaged, After inserting the vulcanized hose at the beginning into the heating means and heating it at a specified temperature for a specified time, pull the mandrel located at the beginning for a specified length to mold the heated vulcanized hose to the specified bending shape. Insert into the outer mold and cool at a predetermined temperature for a predetermined time, after cooling, pull out the molding hose from the molding outer mold by pulling the leading mandrel for a predetermined length, while pulling the mandrel at a predetermined pitch, heat, mold, A method for continuously manufacturing a molded hose, characterized in that a molded hose is manufactured by sequentially repeating cooling. 3. The continuous production method for a molded hose according to claim 2, wherein the vulcanized hose uses a thermoplastic resin for the innermost layer and butyl rubber for the middle layer and the outermost layer. 4. The continuous production method for a molded hose according to claim 2, wherein the vulcanized hose uses butyl rubber for the innermost layer and the outermost layer.