JP5556269B2 - Rubber hose manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing a rubber hose, and more particularly to a method for manufacturing a rubber hose capable of suppressing a decrease in moldability of a steel wire forming a reinforcing layer.

  In a high-pressure rubber hose, a reinforcing layer formed by braiding and winding a steel wire or a reinforcing layer formed by winding in a spiral shape is provided inside the hose. In order to improve the strength of the steel wire forming this reinforcing layer, for example, as shown in FIG. 2, a wire drawing process is performed in which the steel wire base material 6 is inserted into a die 8 (see, for example, Patent Document 1). ).

  In this wire drawing process, the steel wire base material 6 is rapidly contracted in diameter, so that the age-hardened steel wire 7 undergoes age hardening. Therefore, if this steel wire 7 is stored at about room temperature, age hardening proceeds and the strength (rigidity) increases with time. When the step of forming the reinforcement layer after the strength (rigidity) of the steel wire 7 is increased, the steel wire 7 has a large restoring force when the steel wire 7 is wound around the outer peripheral surface of a hose component such as an inner rubber layer. As a result, there is a problem that winding becomes difficult, and even when wound, there is a problem of poor adhesion with the hose structure member (decrease in moldability). When the moldability of the steel wire is lowered, the productivity of the hose is lowered and the quality of the manufactured hose is adversely affected.

Japanese Patent Laid-Open No. 10-166027

  The objective of this invention is providing the manufacturing method of the rubber hose which can suppress the fall of the moldability of the steel wire which forms a reinforcement layer.

In order to achieve the above object, the method of manufacturing a rubber hose according to the present invention comprises forming a reinforcing layer by laminating a drawn steel wire on the outer peripheral surface of a hose constituting member laminated on the outer peripheral surface of a mandrel. A hose forming body was formed by further stacking hose components on the outer peripheral surface, and then the steel wire was drawn by drawing a steel wire base material in a rubber hose manufacturing method for vulcanizing the hose forming body. during the period from immediately after up to formation of the reinforcing layer, the steel wire have a store cooling storage step at a temperature ranging from -15 ° C. to 15 ° C., immediately after producing the steel wire until formation of the reinforcing layer The time obtained by subtracting the time for carrying out the cooling storage step from the standby time after elapse of 2 is 72 hours or less .

Another method of manufacturing a rubber hose according to the present invention is to form a reinforcing layer by laminating a drawn steel wire on an outer peripheral surface of a hose constituting member laminated on an outer peripheral surface of a mandrel, and further forming a reinforcing layer on the outer peripheral surface of the reinforcing layer. In the rubber hose manufacturing method for forming a hose molded body by laminating hose components and then vulcanizing the hose molded body, the reinforcement is made immediately after the steel wire is manufactured by drawing the steel wire base material. A cooling storage step of storing the steel wire in a temperature range of −15 ° C. to 15 ° C. until the layer is formed, and the cooling storage step is performed in a temperature-controlled closed space. .
Still another method for manufacturing a rubber hose according to the present invention is to form a reinforcing layer by laminating a drawn steel wire on the outer peripheral surface of a hose constituting member laminated on the outer peripheral surface of a mandrel, and forming the reinforcing layer on the outer peripheral surface of the reinforcing layer. Furthermore, in a method for manufacturing a rubber hose for forming a hose molded body by laminating hose components and then vulcanizing the hose molded body, the steel wire base material is drawn and the steel wire is manufactured immediately after the steel wire is manufactured. A cooling storage step of storing the steel wire in a temperature range of −15 ° C. to 15 ° C. until the reinforcing layer is formed, and the cooling storage step is performed in a transport vehicle that transports the steel wire. And

  According to the method for producing a rubber hose of the present invention, the steel wire is kept at −15 ° C. to 15 ° C. immediately after the steel wire is produced by drawing and until the reinforcing layer is formed using the steel wire. Since it has the cold storage process of storing in the temperature range, the progress of age hardening of the drawn steel wire can be delayed. Therefore, the strength (rigidity) of the steel wire when forming the reinforcing layer can be reduced, and the steel wire can be easily wound around the outer peripheral surface of the hose component such as the inner rubber layer. Moreover, since the adhesiveness between the wound steel wire and the hose structural member is also improved, the quality of the manufactured hose is also improved.

It is a whole schematic diagram which illustrates the process of the manufacturing method of the rubber hose of this invention. It is explanatory drawing which illustrates the process of manufacturing a steel wire by wire drawing. It is explanatory drawing which illustrates the process of forming a reinforcement layer using the drawn steel wire. It is explanatory drawing which cuts and shows a part of rubber hose manufactured by this invention.

  Hereinafter, the manufacturing method of the rubber hose of this invention is demonstrated based on embodiment shown in the figure.

  As illustrated in FIG. 4, the rubber hose 1 manufactured according to the present invention has a reinforcing layer 3 a, an intermediate rubber layer 4, a reinforcing layer 3 b, and an outer rubber layer 5 laminated in order on the outer peripheral side of the inner rubber layer 2. . The reinforcing layers 3a and 3b are formed by braiding a single steel wire 7 at a predetermined braiding angle. The outer diameter of the steel wire 7 is, for example, about 0.2 mm to 0.8 mm.

  The number of reinforcing layers is not limited to two but may be a single layer or three or more layers. Further, the reinforcing layers 3a and 3b may be formed by winding the steel wire 7 in a spiral shape.

  As illustrated in FIG. 1, the present invention uses a step of manufacturing a steel wire 7 for forming the reinforcing layers 3 a and 3 b by drawing, and the drawn steel wire 7 and other hose components such as rubber. And forming a hose molded body and vulcanizing the molded hose molded body.

  In the process of manufacturing the steel wire 7, as illustrated in FIG. 2, the steel wire 7 is manufactured by drawing the steel wire base material 6 through a die 8 and drawing it. In this wire drawing, the wire diameter is reduced to, for example, about 90% to 98%. The drawing speed is, for example, about 3 m / s to 20 m / s.

  In the wire drawing, the steel wire base material 6 is rapidly reduced in diameter, and thus the steel wire 7 that has been drawn is subject to age hardening due to fixing to dislocations such as carbon atoms, and the steel wire is gradually deteriorated. 7 strength (rigidity) increases. Therefore, in the present invention, the steel wire 7 is kept at −15 ° C. to 15 ° C. immediately after the steel wire 7 is manufactured by drawing the steel wire base material 6 and before the reinforcing layers 3a and 3b are formed. It has a cold storage process that actively cools and stores in the temperature range. Since the progress of age hardening of the steel wire 7 is slowed by this cold storage process, the increase in the strength (rigidity) of the steel wire 7 can be delayed.

  In this embodiment, it has the process of primary storage and the process of secondary storage between the process of manufacturing the steel wire 7, and the process of shape | molding a hose molded object. The primary storage process is, for example, a factory (manufacturing place) where the steel wire 7 is manufactured by wire drawing, a process of storing the manufactured steel wire 7, and a hose molded body from the factory (manufacturing place). This includes the process of transporting to the molding factory (production site).

  The secondary storage process corresponds to a process of storing the steel wire 7 in a factory (manufacturing place) for forming a hose molded body.

  There may be a case where there is no secondary storage step and only a primary storage step, or there may be a tertiary or quaternary storage step. In any case, in the present invention, immediately after the steel wire base material 6 is drawn to manufacture the steel wire 7, the steel wire 7 is used to form the reinforcing layers 3a and 3b. It has a cold storage process for storing the wire 7 in a temperature range of −15 ° C. to 15 ° C.

  Even if the storage temperature is less than −15 ° C., the effect of delaying the progress of age hardening does not change so much. Moreover, at 20 degreeC or more, the effect which delays progress of age hardening becomes small. Therefore, the temperature range of the cold storage process is -15 ° C to 15 ° C, and more preferably, the temperature range is about -15 ° C to 5 ° C.

  In order to reliably form the reinforcing layers 3a and 3b at a stage where the strength (rigidity) of the steel wire 7 is not so much increased by age hardening, the reinforcing layer 3a and 3b is formed using the steel wire 7 immediately after the steel wire 7 is manufactured. The time obtained by subtracting the time during which the cooling storage process is performed from the waiting time elapsed until the formation of 3a and 3b is, for example, 72 hours or less, and more preferably 48 hours or less.

  The cooling storage process is performed in a closed space such as a temperature-controlled storage warehouse (constant temperature chamber), for example. The cold storage process can be performed, for example, in a transport vehicle that transports the steel wire 7 from a factory (manufacturing place) that manufactures the steel wire 7 to a factory (manufacturing place) that forms the hose molded body. That is, the cooling storage process can be performed using a cargo room such as a truck as a temperature-controlled closed space.

  In the step of forming the hose molded body, as illustrated in FIG. 3, an inner rubber layer 2 made of unvulcanized rubber, a reinforcing layer 3a, and an intermediate made of unvulcanized rubber are sequentially formed on the outer periphery of the mandrel 11 serving as a core. The hose constituent members of the rubber layer 4, the reinforcing layer 3b, and the outer rubber layer 5 made of unvulcanized rubber are laminated coaxially.

  When forming the reinforcement layer 3a, the braiding machine 9 is installed so that the outer peripheral surface of the mandrel 11 may be covered as illustrated in FIG. The braiding machine 9 is provided with a number of reels 10 around which steel wires 7 are wound. The carrier of the braiding machine 9 rotates around the mandrel 11 around the axis of the mandrel 11. Then, the carrier of the braiding machine 9 is rotated about the axis of the mandrel 11 and the mandrel 11 is moved in the axial direction (longitudinal direction) so that the steel wire 7 is oriented in a predetermined orientation on the outer peripheral surface of the inner rubber layer 2. Wrap by braiding at an angle. The same applies to the case where the reinforcing layer 3b is formed. In this case, the steel wire 7 is braided and wound around the outer peripheral surface of the intermediate rubber layer 4 at a predetermined orientation angle.

  When the reinforcing layers 3 a and 3 b have a spiral structure, the steel wire 7 is spirally wound around the outer peripheral surface of the inner rubber layer 2 to form the reinforcing layer 3 a, and the steel wire 7 is spiraled around the outer peripheral surface of the intermediate rubber layer 4. The reinforcing layer 3b is formed by winding in the shape.

  In the present invention, an increase in strength (rigidity) due to age hardening of the drawn steel wire 7 is delayed by providing a cold storage process. Therefore, the restoring force of the steel wire 7 when the steel wire 7 is wound around the outer peripheral surface of the inner rubber layer 2 and the outer peripheral surface of the intermediate rubber layer 4 is still small, and it becomes easy to wind. Therefore, it is advantageous for improving the productivity of the hose. Further, adhesion between the wound steel wire 7 and the inner rubber layer 2 and the intermediate rubber layer 4 is also improved. By providing the cooling storage step in this way, it is possible to suppress a decrease in the moldability of the steel wire 7 manufactured by drawing.

  In the step of vulcanizing the hose molded body, the hose molded body is vulcanized by a vulcanizing device (vulcanizing box), whereby the rubber hose 1 is completed. In the present invention, since the adhesion between the wound steel wire 7 and the inner rubber layer 2 and the intermediate rubber layer 4 is improved, the quality of the manufactured rubber hose 1 is also improved.

  16 types of test samples (Examples 1 to 12, comparative examples) with different steel wire diameters (0.40 mm) and different steel wire specifications and drawing temperature conditions as shown in Table 1 1-4) were prepared, and the following moldability and cutting load were evaluated for each test sample. The evaluation results are shown in Table 1.

  The wire types 72A and 82A in Table 1 are materials having carbon contents of 0.72% and 0.82%, respectively. The degree of processing is a numerical value calculated by the following equation, where D0 is the diameter of the steel wire after patenting and D1 is the diameter of the steel wire after wire drawing.

Degree of processing = ((D0 ² −D1 ² ) / D0 ² ) × 100 (%)
It shows that the steel wire was manufactured by extending the steel wire base material more in the wire drawing process as the numerical value of the processing degree is larger.

[Typeability]
Immediately after producing the test sample by drawing (0 hour) and 144 hours after production, a 1 kgf weight is attached to one end of the test sample, and the test sample is densely attached to a pipe having an outer diameter of 14 mm. The test sample was rolled up, further reversed, and after the test sample was unwound from the pile, the diameter of the test sample that was in an annular shape when the weight was removed was measured. The smaller the value, the better the moldability.

[Cut load]
The cutting load was measured immediately after manufacturing the test sample by wire drawing (0 hour) and at four time points of 24 hours, 72 hours, and 144 hours after manufacturing. The rate of change in Table 1 is the rate of change of the cutting load between two time points immediately after manufacturing the test sample (0 hour) and 144 hours after manufacturing.

  From the results in Table 1, when the storage temperature of the test sample (steel wire manufactured by drawing) is 25 ° C., age hardening progresses without delay and the moldability decreases, and the storage temperatures are 15 ° C. and 0 ° C. It can be seen that by setting the temperature to minus 15 ° C., the progress of age hardening can be delayed, and the deterioration of moldability is suppressed.

DESCRIPTION OF SYMBOLS 1 Rubber hose 2 Inner surface rubber layer 3a, 3b Reinforcement layer 4 Intermediate rubber layer 5 Outer surface rubber layer 6 Steel wire base material 7 Steel wire 8 Die 9 Braiding machine 10 Reel 11 Mandrel

Claims (5)

A steel wire that has been drawn is laminated on the outer peripheral surface of a hose component laminated on the outer peripheral surface of the mandrel to form a reinforcing layer, and a hose component is further laminated on the outer peripheral surface of the reinforcing layer to form a hose molded body. In the method of manufacturing a rubber hose for forming and then vulcanizing the hose molded body, the steel wire is drawn immediately after the steel wire base material is drawn to the formation of the reinforcing layer. the have a store cooling storage step at a temperature range of -15 ° C. to 15 ° C., the waiting time elapsed before forming the reinforcing layer immediately after production of the steel wire, the time for the cooling storage step A method for producing a rubber hose in which the subtracted time is 72 hours or less . A steel wire that has been drawn is laminated on the outer peripheral surface of a hose component laminated on the outer peripheral surface of the mandrel to form a reinforcing layer, and a hose component is further laminated on the outer peripheral surface of the reinforcing layer to form a hose molded body. In the method of manufacturing a rubber hose for forming and then vulcanizing the hose molded body, the steel wire is drawn immediately after the steel wire base material is drawn to the formation of the reinforcing layer. the have a store cooling storage step at a temperature range of -15 ° C. to 15 ° C., the cooling storage step, the manufacturing method of the rubber hose to perform in the closed space, which is temperature-controlled. A steel wire that has been drawn is laminated on the outer peripheral surface of a hose component laminated on the outer peripheral surface of the mandrel to form a reinforcing layer, and a hose component is further laminated on the outer peripheral surface of the reinforcing layer to form a hose molded body. In the method of manufacturing a rubber hose for forming and then vulcanizing the hose molded body, the steel wire is drawn immediately after the steel wire base material is drawn to the formation of the reinforcing layer. the have a store cooling storage step at a temperature range of -15 ° C. to 15 ° C., the cooling storage step, the manufacturing method of the rubber hose to perform in the transport vehicle for transporting steel wire. The rubber hose production according to claim 2 or 3 , wherein a time obtained by subtracting a time during which the cooling storage step is performed from a waiting time elapsed immediately after the steel wire is produced until the reinforcing layer is formed is 72 hours or less. Method.   The method for manufacturing a rubber hose according to claim 1, wherein the reinforcing layer is a braided layer formed by braiding a steel wire.

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