JP2005265056A - Rubber shaped body and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber shaped body of which pressure resistant strength is reinforced and of which end part or fastening with a fitting is automatically and uniformly formed firmly, and a method for manufacturing the same. <P>SOLUTION: This rubber shaped body consists of unvulcanized rubber composition layer 2 to be a inner rubber layer and a fitting 3 arranged on both sides or one side thereof. A covering layer formed by continuously winding single of multiple covering code 1 at fixed angles on the rubber shaped body while turning around at an end part of the rubber composition layer 2 or the fitting 3 with keeping incidence angle and reflection angle same. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rubber molded body, and specifically relates to a rubber molded body having a reinforcing structure such as a flexible tube, a flexible joint, and a rubber hose, and a manufacturing apparatus thereof.

  Conventionally, flexible pipes, flexible joints, rubber hoses, etc., which are rubber molded bodies, have various fittings that can withstand internal pressure by providing fittings at both ends or one end when used under pressurized conditions. The structure is taken.

  Specifically, as illustrated in FIG. 6, the end fitting of the inner tube 62 and the outer tube 63 is attached to the end of the cylindrical hose 61 with the hose 61 interposed therebetween, and the inner peripheral surface of the inner tube 62 There has been proposed a method in which the hose 61 is simultaneously plastically deformed and fastened by an expanding force applied to the hose 61 (see, for example, Patent Document 1).

  Further, the rubber molded body is covered with fibers, and the entire structure including the fitting is firmly tightened with the fibers so as to be reinforced so as not to come off during use. Such reinforcing fibers include a belt-like ply cord in which fibers (hereinafter referred to as “coating cords”) coated with a single strip or a plurality of rubbers are arranged in parallel and coated with an unvulcanized rubber composition. It was formed by laminating layers. In the case of such a single-strip or several-strip coating cord, the advantage is high in that a material having a large width is not required as in the interleaved fiber (see, for example, Patent Document 2).

  At this time, as for the structure at the end of the covering cord, for example, as illustrated in FIG. 7, when the covering cord 1 is folded back at the end, the covering cord 1 is wound by a single line at an angle close to a right axis. There is something to be done. An unvulcanized rubber composition layer used as an inner rubber layer formed on a mandrel 5 is used for applications in which deformation due to stress having a component in a direction orthogonal to the axis of the tube occurs. (Hereinafter referred to as “rubber composition layer”) 2 is spirally wound around.

Further, as illustrated in FIG. 8, it is known that when the covering cord 1 is folded back at the end portion, the end portion is formed to reflect in the direction opposite to the incident direction. The covering cord 1 is arranged and laminated on the rubber composition layer 2 formed on the mandrel 5 so as to be folded at the end of the covering layer to form a predetermined angle with respect to the axial center direction of the tube. A second layer of the covering cord 1 is usually laminated on this so as to cross symmetrically (in the P direction).
No. 5-9584 JP 2003-127202 A

  However, when the above-mentioned rubber molded body is used as a pressure hose having a particularly large diameter, some improvements are preferable.

  That is, with the conventional method, it is difficult to secure the fastening force between the rubber composition layer and the fitting, and even when the coating layer is formed, the fastening force between the fitting and the coating layer at the folded portion at the end portion. It was often difficult to ensure In particular, in a pressure hose having a large diameter, since the axial load W is added to the inner pressure Po × cross-sectional area S as the fastening force with the metal fitting, the rubber composition layer and the metal fitting of the pressure hose main body are It must be tightened more firmly than the pressure hose. Therefore, securing the fastening force between the fitting and the rubber composition layer at the folded portion at the end of the pressure hose having a large diameter has been a major issue.

  In addition, the dimensional change of the fixed portion is likely to occur as the internal pressure increases, and in order to prevent this, a complicated material configuration as in the prior art is required.

  Furthermore, the pressure hose is usually composed of an even number of plies in two or more directions opposite to each other, and requires a cumbersome work of carefully holding the coating layers formed separately or simultaneously at the fittings. It was something to do.

  Accordingly, the present invention reinforces the pressure strength of the rubber molded body in the rubber molded body comprising the rubber composition layer, or the rubber molded body comprising the rubber composition layer and the metal fittings disposed at both ends or one end thereof, And it aims at providing the rubber molding which formed the fastening with the edge part or a cap metal automatically and uniformly firmly, and its preparation apparatus. In other words, the formation of the coating layer is continuously performed without being interrupted in two opposite directions or more, and fastening with the end portion or the fitting is performed at the same time as the formation of the coating layer. An object of the present invention is to provide a rubber molded body having a high height and a production apparatus therefor. In particular, an object of the present invention is to provide a rubber molded body applicable to a pressure hose having a large diameter and a manufacturing apparatus thereof.

  As a result of intensive studies to solve the above problems, the present inventors have found that the above object can be achieved by a rubber molded body and a manufacturing apparatus thereof shown below, and have completed the present invention.

  The present invention provides a rubber molded body comprising an unvulcanized rubber composition layer serving as an inner rubber layer and a fitting provided at both ends or one end thereof, wherein the coated cord comprising a single or a plurality of strips is used as the rubber composition. It has a coating layer that is wound around a rubber molded body continuously at a constant angle through a protrusion while turning back with an incident angle and a reflection angle being equal at the end of the object layer or the fitting. And

  That is, the inventor turns back one or several coated cords through the end portion of the rubber molded body or a fitting provided at the end portion, and the winding tip portion of the coated cord reciprocates along the axis. Thus, it has been found that the end portion or the end portion and the fitting and the covering layer can be firmly fastened, and a rubber molded body having high pressure resistance can be provided.

  The present invention provides the rubber molded body, wherein the coating layer controls the rotation speed of the mandrel and the reciprocating speed in the axial direction of the rubber molded body while setting the rotation direction of the mandrel to one direction. It is characterized by being formed with a constant winding angle of the covering cord around the rubber molded body.

  In other words, one or several rubber-coated cords are wound at a certain angle with respect to the axis of the rubber molded body, and then folded back through the end portion or the projection of the metal fitting disposed at the end portion, and the mandrel is rotated. With the direction as one direction, the winding cord winding tip reciprocates along the axis, so that two directions of pressure-resistant coating layers reinforced at opposite angles can be formed at the same time. Since the metal fitting and the covering layer can be firmly fastened, a rubber molded body with higher pressure resistance can be provided.

  The rubber molded body is characterized in that the covering cord is a rubber-coated fiber.

  That is, when a synthetic fiber or an inorganic fiber is used as the reinforcing fiber and the surface thereof is covered with rubber and wound, slippage between the objects to be wound can be prevented. Further, by forming the coating layer with a fibrous body, it is possible to press the rubber molded body with elasticity, and it is possible to configure a rubber molded body that is flexible and has high pressure resistance.

  The present invention is an apparatus for producing a rubber molded body comprising an unvulcanized rubber composition layer serving as an inner rubber layer and a fitting provided at both ends or one end of the rubber composition layer. In forming a coating layer by wrapping a coating cord consisting of a single strip or several strips, the coating layer has a rotation direction of the mandrel in one direction, and the rotation speed of the mandrel and the axial direction of the rubber molded body The reciprocating speed of the rubber molded body is controlled so that the angle of wrapping the coating cord around the rubber molded body is constant, and the angle of incidence and the reflection angle are equalized at the end of the rubber composition layer or the fitting. It is characterized in that it is wound continuously at a constant angle.

  As described above, by forming a reinforcing structure with a constant winding angle of one or several coated cords, a rubber molded body with high pressure resistance that can maintain flexibility and strength can be obtained. In the production of such a rubber molded body, the present invention provides a method for winding a coated cord around a rubber composition layer. At the same time, the coated cord is wound around the entire rubber composition layer at a certain angle with respect to the axis. The present invention provides an excellent apparatus for producing a rubber molded body by utilizing the fact that folding with the incident angle and the reflection angle being equalized through the end portion or the fitting of the metal is an extremely excellent production method.

  Specifically, with the mandrel rotation direction always kept in one direction, the mandrel rotation speed and the mandrel axial movement speed are adjusted to form an angle with less bending reaction force with respect to the axis. One or several coated cords can be wound. Further, at the end of the rubber molded body, the mandrel is rotated in the same direction and the mandrel is moved in the reverse direction to reverse the mandrel movement direction, so that the covering cord is inserted through the end fitting of the rubber composition layer or the end fitting. Thus, folding can be performed by making the incident angle and the reflection angle equal. In this way, by controlling the rotation speed and reciprocating speed of the mandrel, it is possible to simultaneously form a pressure-resistant coating layer in two directions reinforced at opposing angles, and the end portion or the fitting and the coating. It is possible to provide an apparatus for producing a rubber molded body that can form an end portion for firmly fastening the layer.

  The present invention is the apparatus for producing the rubber molded body, wherein the coating cord is a rubber-coated fiber, and the rubber extrusion coating on the fiber and the winding around the rubber molded body are simultaneously performed. And

  In other words, when synthetic fiber or inorganic fiber is used as the reinforcing fiber and the surface is covered with rubber and wound, it can prevent slipping between the objects to be wound, while the strength is reduced due to the hygroscopicity of the rubber or the like. Due to the possibility of a decrease in the covering ability, there is a limit to the time for which the covering cord is left. In the present invention, such a possibility can be prevented beforehand by winding the rubber molded body at the same time as the extrusion coating. Further, the rubber can be formed quickly and reliably.

  As described above, in the present invention, an excellent rubber molded article having high pressure resistance and high functionality can be provided by forming a coating layer in which the method of winding the coating cord around the rubber composition layer is devised. Further, by devising and controlling the operation of the mandrel, it is possible to provide an apparatus for producing a rubber molded body that reveals such an excellent winding method. Furthermore, in the production of a rubber molded body having a fitting, it is possible to easily fasten it with a complicated fitting that requires skill.

  Specifically, in the present invention, even if it has a protrusion or a different diameter portion, it can be wound in accordance with its shape, so that it can have a constant cord angle and density in all the strips. Also, in terms of workability, since it is completed with one operation, the intermittentness of the operation can be eliminated, and no special skill level is required.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 illustrates a rubber molded body according to the present invention. FIG. 1 (A) shows a rubber molded body in which a fitting 3 having protrusions 4 at both ends or one end is arranged, and the covering cord 1 is continuously attached to the fitting 3 via the rubber composition layer 2 and the protrusions 4. The form which is wound is shown. Moreover, FIG. 1 (B) has shown the form seen from the fitting 3 direction.

  The covering cord 1 is wound around the rubber composition layer 2 in several layers at a certain angle with respect to its axis. By doing in this way, the rubber composition layer 2 can be reinforced and can endure the fluid pressure inside the rubber molded body during use. Further, uniform winding can be performed by equal winding.

  In addition, the metal fitting 3 has an opening 3a, and an inclined portion 3b in which the rubber composition layer 2 is inserted and the protruding portion 4 serves as a stop portion, thereby enhancing the adhesion between them. In particular, in the inclined portion 3b, a high-density covering cord 1 is wound in one layer around which the covering cord 1 is wound as shown in FIG. Strong reinforcement can be performed. Such a high-density portion is sequentially formed in another portion in the next layer, and the function of enhancing the reinforcing effect can be produced as the entire inclined portion 3b.

  At the same time, the covering cord 1 is folded back at a certain incident angle and reflection angle at the protrusion 4 and continuously wound around the protrusion 4. With such a configuration, the covering cord 1, the rubber composition layer 2 and the fitting 3 are firmly fastened, and excellent pressure resistance characteristics are secured even with a rubber molded body having a large diameter.

  Here, although the form (1st structural example) in the rubber molded object which has arrange | positioned the metal fitting 3 which has the projection part 4 in both ends or one end is shown, this invention has the flat metal fitting 3 which does not have a projection part. The present invention can also be applied to a rubber molded body (second configuration example) provided or a rubber molded body (third configuration example) provided with a fitting 3 having an inclined portion.

<Center of rubber molding>
One or several coated cords 1 are wound around the rubber composition layer 2 in one or several layers at a certain angle φ with respect to the axis. As a result, the rubber composition layer 2 can be reinforced and can withstand the fluid pressure inside the rubber molded body during use.

  Moreover, when winding so that the rubber composition layer 2 whole may be covered, there exists a possibility of (1) duplication of adjacent wire materials, (2) nonuniformity of the winding space | interval in the protrusion part 4 or the inclination part 3b, etc. . By using a single or several covered cords as the covering cord 1, such a possibility can be effectively prevented. Moreover, uniform reinforcement can be performed by winding at substantially equal intervals, and pressure resistance can be further improved.

  As the winding angle θ, an angle other than 0 ° or 90 ° can be arbitrarily selected, but 50-60 ° is preferable as the inventor's knowledge, and FIG. 1 illustrates the case of 55 °. Moreover, the winding density of the covering cord 1 is sufficient to hold the rubber composition layer 2 and can be arbitrarily set depending on the application.

<Rubber molded end>
In winding the covering cord 1 around the rubber composition layer 2, the covering cord 1 is folded back with the incident angle θi and the reflection angle θo being equalized through the end of the rubber molded body or the end fitting 3, and the end fittings at both ends or one end. 3 and the coating layer 4 are fastened.

  Normally, a pressure fitting hose requires a cap 3 and has an opening 3a, an inclined portion 3b, a flat portion 3c, and a protruding portion 4. Therefore, as illustrated in FIG. By folding the cord 1 at the flat portion 3c, the fastening at the end can be made stronger. The same effect can be obtained even if there is a groove in the metal fitting 3 in addition to the protrusion 4, but in the case of the groove, the covering cord 1 tends to converge and become a dango state when it is folded back. The wrapping through is stable.

  Moreover, when using the metal fitting 3, the adhesiveness of both is improved by inserting the rubber composition layer 2 in the inclined part 3b by using the projection part 4 as a stop part. In particular, the inclined portion 3b is wound at a certain angle, whereby a high-density coating layer can be formed in the entire layer around which the covering cord 1 is wound, and strong reinforcement can be performed. As a result, it can create a work that enhances the reinforcement effect.

  When the covered cord 1 itself is covered with rubber, the folded portion is bonded in a state of being in close contact with the flat portion 3c by the hardening of the rubber, and therefore there is no possibility of peeling. Even when the covering cord 1 itself is not covered with rubber, it is bonded in a state of being in close contact with the flat portion 3c when the rubber composition layer 2 is cured.

  In addition, in FIG. 1, although the form in the rubber molding which arranged the metal fitting 3 which has the projection part 4 in both ends or one end was illustrated, it is not limited to the shape of the metal fitting 3 edge part regarding application of this invention. In addition, even at various shapes such as a flat shape (FIG. 2) exemplified as the second configuration example, an inclined shape (FIG. 3) exemplified as the third configuration example, or a convex section (FIG. 4), fastening at the end portion It is possible to obtain a technical effect that makes the

  As a second structural example of the present invention shown in FIG. 2, in a rubber molded body in which a fitting 3 having no protrusions is arranged at both ends or one end, the covering cord 1 is connected to the end via the end A of the rubber composition layer 2. The form continuously wound around the metal fitting 3 is shown. Even in the case of a rubber molded body having no protrusion, at the end A, by using the step formed between the end fitting 3 and by folding the covering cord 1 at the flat portion B of the end fitting 3 below the step, The fastening at the end can be made stronger.

  That is, in the second configuration example, the coating cord 1 made of a single or several strips is made to have the same incident angle θi and reflection angle θo at the flat portion B of the fitting 3 through the end surface A of the rubber composition layer 2. Wrapping. This form is substantially the same as the form in the rubber molded body provided with the fitting 3 having the protrusions, and the same technical effect can be obtained.

  As a third configuration example, an embodiment of the present invention in a rubber molded body having an inclined end portion is illustrated in FIG. The coated cord 1 consisting of a single or several strips is folded back with the incident angle θi and the reflection angle θo being equal at the inclined portion C of the fitting 3 via the end face A of the rubber composition layer 2. The entire inclined portion can obtain the same technical effect as the configuration of the inclined portion 3b of the fitting 3 in the first configuration example, and the inclined portion C is similar to the configuration of the plane portion B in the second configuration example. The technical effect can be obtained.

  Furthermore, even when the end portion of the rubber molded body has a convex cross-sectional shape illustrated in FIG. 4, the same technical effect as that of the second configuration example can be obtained, and the present invention can be applied to various forms. is there.

  Next, the operation of the rubber molded body manufacturing apparatus, that is, the manufacturing method will be described in detail with reference to FIG.

  (1) The mandrel 5 is inserted into the rubber composition layer 2 and the fitting 3 and set in a cord winding device (not shown). At this time, the rubber composition layer 2 is inserted into the inclined portion 3b of the cap 3 and the rubber composition layer 2, the cap 3 and the mandrel 5 form one unit.

  (2) The covering cord guide 6 is fixed at a predetermined position of the cord winding device. Here, the guide 6 is fixed and the mandrel 5 will be described as an apparatus that can be moved. However, it is of course possible to manufacture the apparatus using the apparatus that can move the guide 6 or both of which can be moved. .

  (3) While the mandrel 5 is rotated as indicated by the arrow R in FIG. 2, the coated cord 1 coated with unvulcanized rubber is wound around the rubber composition layer 2 through the guide 6 by an extruder (not shown). Although the position at the start of winding is not specified, the coated cord 1 is more likely to be in close contact with the rubber composition layer 2 in the heated state immediately after extrusion.

  Further, the coated cord 1 is preferably a rubber-coated fiber, and it is preferable to perform extrusion coating of rubber around the fiber and winding around the rubber composition layer 2 at the same time. For one, when synthetic fibers or inorganic fibers are used as reinforcing fibers and the surface thereof is covered with rubber and wound, slippage between the objects to be wound can be prevented. In addition, there is a limitation in the time for leaving the rubber-coated cord due to the possibility of a decrease in strength due to the hygroscopic property of the rubber or a decrease in coating ability. In the present invention, the rubber composition layer 2 is wound around simultaneously with the extrusion coating. By doing this, it is possible to prevent this possibility.

  At this time, by moving the mandrel 5 to the left and right as indicated by an arrow Xa or Xb in the figure, the covering cord 1 can wind the rubber composition layer 2 at a predetermined angle. The density and angle of the covering cord 1 can be freely set by adjusting the rotation of the mandrel 5 and the lateral movement speed. If the relationship between the rotation speed of the mandrel 5 and the lateral movement speed is constant, the winding angle of the covering cord 1 θ is constant. FIG. 2 illustrates the case of 55 °.

  (4) The rubber composition layer 2 is wound around the covering cord 1 while moving the mandrel 5 in the Xa direction of FIG. At the end, the protrusion 4 is wound at an incident angle θi via the inclined portion 3 b of the cap 3. Although the mandrel 5 moves to the left and right, the entire length of the winding is the moving distance.

  (5) When the covering cord 1 hits the flat portion 3c, the movement of the mandrel 5 is stopped, and then the mandrel 5 is folded back and moved in the Xa direction. At this time, the covering cord 1 is folded at the flat portion 3c, and the rubber composition layer 2 is wound around the projection portion 5 and the inclined portion 3b at the reflection angle θo. That is, the covering cord 1 is wound with a certain angle, and when the movement of the mandrel 5 is reversed after passing through the protrusion 4 of the fitting 3, the covering cord 1 is wound with a reflection angle opposite to the incident angle.

  At this time, the covering cord 1 has sufficient protrusions 4 and catches, and cannot be detached by physical force. When the movement of the mandrel 5 is converted in the reverse direction by the protrusion 4, the catching length of the protrusion 4 can be adjusted by temporarily providing a time difference. This operation is possible even when the covering cord 1 is not a single strip but several strips, but when there are multiple strips, it is difficult for the protrusions 4 to be caught uniformly.

  (6) Next, the rubber composition layer 2 is wound around the covering cord 1 while moving the mandrel 5 in the Xa direction again so as to be adjacent to the wound covering cord 1. By repeating (4) and (5) in this way, it is possible to form a layer of the covering cord 1 that is spread almost at equal intervals. In particular, by setting the incident angle θi and the reflection angle θo to substantially the same angle as the winding angle θ, a uniform layer of the coated cord 1 can be formed. However, although the winding density in the protrusion 4 is slightly sparse compared to other portions, this portion is a portion where bending does not occur and does not cause any problem.

  (7) When the metal fittings 3 are provided at both ends, the same operations as in the above (4) to (6) are repeated with the metal fitting 3 on the opposite side. With such a configuration, the exposed end portions of the covering cord are only the first and last portions, and hundreds of cord ends are not exposed as in the prior art. As a result, it is possible to reduce the number of bonding defects and greatly reduce the risk of moisture intrusion.

  (8) Next, by repeating the above (4) to (7) so as to cross the layer of the wound covering cord 1, a plurality of covering layers by the covering cord 1 can be formed.

  (9) The rubber molded body thus formed is used as the next step to vulcanize the unvulcanized rubber composition layer 2, the first coating layer 4 or the coating cord 1 by heating or ultraviolet irradiation. Thus, a pressure-resistant rubber molded body in which the coating layer is fixed is completed.

  In the production of the rubber molded body described above, the covering cord 1 is preferably wound in a state in which unvulcanized rubber is covered. Bonding / fixing with the rubber composition layer 2 is easy, the degree of adhesion to the fitting 3 and the like is high, and a coating layer having excellent stability can be formed.

  In the present invention, the winding time is slightly longer because it is wound with a single or several strips, but it is sufficient to use one or several bobbins, and the folding time and preparation time are extremely shortened. Especially suitable for production of relatively small quantities. Moreover, since the winding is performed in units of one or several, there is little material loss.

  In the production of the rubber molded body of the present invention, as the rubber composition layer 2, a rubber composition known in the field of a flexible tube, a rubber hose and the like is appropriately selected and used according to the intended use. The inner rubber layer constituting rubber and the outer rubber layer constituting rubber may be the same rubber material or different rubber materials. In flexible tubes, flexible joints, and rubber hoses, usually, rubber having excellent durability is used for the outer layer, and a rubber material having characteristics corresponding to the fluid passing through the inner layer is used for the inner layer. A thermoplastic resin tube such as a polytetrafluoroethylene tube or a polyethylene terephthalate tube, a thermoplastic elastomer, a stainless corrugated tube, or the like may be used for the contact surface with the fluid.

  Moreover, it is also a suitable aspect about the metal fitting 3 to provide connection parts, such as a flange, as needed.

The covering cord 1 can use the well-known fiber used as a reinforcing fiber without limitation. Specific examples include polyester fibers such as polyethylene terephthalate and polyethylene naphthalate, polyamide fibers such as nylon 6 and nylon 66, organic fibers such as high-strength fibers such as aramid fibers, steel cords, glass fibers, and carbon fibers. .
Among these, high-rigidity fibers such as steel cords, glass fibers, and carbon fibers are difficult to reduce the radius of curvature when folded at the ends, and are used in consideration of such characteristics. For example, when forming a fold having a small radius of curvature, it is preferable to use an organic fiber, and when the radius of curvature is large, a steel cord can also be used.

  The fiber may be a monofilament or a multifilament, but a multifilament yarn is preferably used as the coated cord 1 from the viewpoint of excellent strength and flexibility.

  The fiber used as the covering cord 1 is preferably subjected to a treatment for improving the adhesiveness in advance, if necessary. For example, a resin treatment such as a phenol resin treatment is applied to a polyester fiber or a polyamide fiber. Examples of the glass fiber include coupling agent treatment such as a silane coupling agent and a titanium coupling agent, and brass plating for the steel cord.

  As the rubber for coating, natural rubber or synthetic rubber can be used regardless of whether this rubber is sufficiently cut by the extrusion pressure into the fiber layer and does not easily separate even in an unvulcanized state. .

  A known covering cord such as a steel ring or a coiled reinforcing metal fitting may be used for the outer layer of the produced rubber molded body, if necessary, and a reinforcing woven fabric layer for preventing wear is used for the outermost layer. May be provided.

  As shown in FIG. 5, the mandrel 5 is provided with a fitting 7 at both ends, and the fitting is joined by an internal rubber. In the present invention, the mandrel 5 rotates only in either the forward direction or the reverse direction, and can move the shaft (left and right) repeatedly left and right.

  Hereinafter, the present invention will be further described with reference to specific examples. Needless to say, the present invention is not limited to such examples and comparative examples.

<Example>
Using a mandrel with an outer diameter of φ70, an inner rubber body (NR 60 degrees) of 4 mm is laminated, and connected to a fitting with an outer diameter of φ76 having protrusions φ93 at both ends. In this state, using an extruder, the rubber-coated steel cord is set to be supplied from the fixed guide. The steel cord has a wire diameter of 1.3 mm, a breaking strength of 150 kg / piece, and a rubber-coated diameter of φ2 mm. The start of winding is not particularly restricted, but it is better to start from the end of the bracket. The winding angle is set according to the required characteristics of the hose. In general, about 55 ° is stable with respect to the shaft, and 55 ° in the embodiment.

  In the winding to the flat part beyond the protruding part of the fitting, and further to the fitting on the other end, the rotation and movement speed of the mandrel are adjusted so as to maintain this angle of 55 °. Since the angle is constant, the cord density is sparse at the protrusion. When the other end fitting and the protrusion (φ93) are reached, the left and right movement of the mandrel is stopped or the movement direction is switched. During this time, the mandrel is rotating, so the cord is wound along the protrusion. The length wound around the outside of the protruding portion needs an amount to withstand the action of the cord being stretched by the internal pressure, but it is not necessary to take a particularly long length as long as the cord does not protrude from the projection. A / 4 turn is sufficient. This amount can be easily adjusted freely by controlling the opening point and movement at the end. In this way, the cord wound around the end fitting at the end portion is arranged at an angle facing the previous cord by reversing the direction of movement of the mandrel while the mandrel continues to rotate. .

  When changing from the first winding to the second winding, the pitch (density) of the cord can be controlled by controlling the winding distance to the fitting.

  In addition, such winding is possible only when the cord has a solid rubber coating. If a bare cord is wound directly, misalignment, pitch disturbance, and poor adhesion to rubber will occur. As a condition of the invention, a cord covered with unvulcanized rubber is assumed.

<Comparative example>
A test rubber molded body was produced by a method of fixing a cylindrical hose using the fittings 62 and 63 as exemplified in FIG.

<Result>
The following results were obtained for the examples and comparative examples.

実施例においては、口金具とコードが自動的に強固に接合でき、その作製工数も殆ど発生することなく、コードロスもほぼゼロとの結果を得た。一方、従来のリング（口金具）を介する方法では、上記の長さ２ｍホースの形成には、表１に示す工数を必要とした。また、ゴムとの接着不良となる本体部分で大きく移動することで寸法変化が起きた。

In the examples, the metal fittings and the cord can be automatically and strongly joined, and the production man-hours hardly occur, and the cord loss is almost zero. On the other hand, in the method using a conventional ring (a fitting), the man-hours shown in Table 1 are required to form the above-mentioned 2 m long hose. Moreover, a dimensional change occurred due to a large movement in the main body part that caused poor adhesion to rubber.

  In the above, the application of the present invention to the rubber molded body in which the metal fittings having the protrusions are arranged at both ends or one end has been described, but the same technical idea is not only the metal fittings but also the connecting member when connecting the rubber molded bodies to each other. The present invention can also be applied to a case where another member is disposed at both ends or one end of the rubber molded body, and can be applied to a wide range of uses.

Explanatory drawing which shows the 1st structural example of the rubber molding which concerns on this invention. Explanatory drawing which shows the 2nd structural example of the rubber molding which concerns on this invention. Explanatory drawing which shows the 3rd structural example of the rubber molding which concerns on this invention. Explanatory drawing which shows the 4th structural example of the rubber molding which concerns on this invention. Half sectional view for explaining a method for producing a rubber molded body according to the present invention Explanatory drawing which illustrates the fixing method of the edge part of the rubber molding which concerns on a prior art Explanatory drawing which illustrates the winding method of 1 covering cord concerning a prior art Explanatory drawing which illustrates the winding method of the other coating cord concerning a prior art

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Covering cord 2 Rubber composition layer 3 Metal fitting 4 Protrusion part 5 Mandrel 6 Guide

Claims (5)

  A rubber molded body comprising an unvulcanized rubber composition layer serving as an inner rubber layer and a fitting provided at both ends or one end of the rubber composition, wherein a coating cord consisting of a single strip or several strips is attached to the end of the rubber composition layer. A rubber molded body comprising a coating layer formed by continuously wrapping around a rubber molded body at a constant angle while turning back with the same incident angle and reflection angle in the part or the fitting.   The rubber molded body, wherein the coating layer controls the mandrel rotational direction and the reciprocating speed in the axial direction of the rubber molded body while controlling the rotation direction of the mandrel in one direction. The rubber molded body according to claim 1, wherein the covering cord is wound at a constant winding angle.   The rubber molded body according to claim 1 or 2, wherein the rubber molded body is a rubber-coated fiber.   An apparatus for producing a rubber molded body comprising an unvulcanized rubber composition layer serving as an inner rubber layer and a fitting provided on both ends or one end thereof, wherein the rubber composition layer or the fitting is a single strip or a number When forming a coating layer by winding a coating cord comprising a strip, the coating layer has a mandrel rotation direction as one direction, and the mandrel rotation speed and the reciprocating speed in the axial direction of the rubber molded body are And forming a constant winding angle of the covering cord around the rubber molded body, and continuously turning back while making the incident angle and the reflection angle equal at the end of the rubber composition layer or the fitting. An apparatus for producing a rubber molded body, which is wound at a certain angle. The apparatus for producing the rubber molded body, wherein the covering cord is a rubber-coated fiber, and the rubber extrusion coating on the fiber and the winding around the rubber molded body are simultaneously performed. 4. An apparatus for producing a rubber molded article according to 4.

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