JP2008142930A - Extrusion apparatus and method for producing rubber-coated wire - Google Patents

Abstract

An object of the present invention is to provide an extrusion apparatus equipped with a rubber-coated head that can be used for a long period of time with minimal component replacement, and further, a rubber-coated wire using the extrusion apparatus. A method for producing a shaped material is provided.
A plurality of introduction holes 7 for introducing a linear material 6 into a rubber-coated head 1 are formed. Each of the introduction holes 7 is made of ceramics, and a cylindrical guide member 9 having a guide hole 18 at the center is provided. A fixing means 17 is provided to fix each guide member 9 by sandwiching it between the head main body 1, and each guide member 9 is mounted on the head main body 5 by adjusting the pressing force of the fixing means 17 against the guide member 9. It is slidable at
[Selection] Figure 1

Description

  The present invention relates to an extrusion apparatus for applying a rubber coating to a linear material such as a steel cord, and a method for producing a rubber-coated linear material using the same.

  Conventionally, in order to increase the strength of a rubber product such as a rubber hose, a reinforcing layer may be formed by spirally winding a linear material such as a steel cord coated with rubber around the surface of the rubber product.

  In this case, in order to obtain a rubber-coated linear material, as described in Patent Document 1, a plurality of linear materials are introduced into a rubber-coated head in which a rubber flow path is formed, and the rubber-coated head is introduced. There is known a method using an extrusion apparatus in which a plurality of rubber-coated wire rods are drawn out from an extrusion hole of an attached extrusion die.

In the rubber-coated head, a plate-shaped metal cord guide in which a plurality of guide holes are formed is attached to the introduction portion for introducing the linear material, and a plurality of extrusion portions for extruding the rubber-coated linear material are provided to the extrusion portion. An extrusion die in which extrusion holes are formed is attached.
Japanese Utility Model Publication No. 2004-106223

  By the way, since the extrusion hole of the extrusion die covers the linear material with rubber, the hole diameter is formed larger than the diameter of the linear material, whereas the guide hole formed in the code guide is introduced. If the diameter is too larger than the diameter of the linear material, the covering rubber may leak out from the guide hole, so that the diameter is close to the diameter of the linear material. As a result, there is a problem that the guide hole wall and the linear material are likely to come into contact with each other and the wear of the guide hole wall becomes severe, and the entire cord guide must be replaced at an early stage.

  In particular, when a linear material represented by a steel cord or the like is introduced into a rubber flow path in a rubber-coated head, the coated rubber penetrates and expands inside the linear material due to rubber pressure applied to the rubber flow path. Due to this property, the gap between the linear material and the guide hole is further narrowed, the guide hole wall is easily worn, and there has been a problem that the use period of the code guide is shortened.

  Therefore, the present invention aims to provide an extrusion apparatus equipped with a rubber-coated head that can be used for a long period of time with minimal parts replacement, with less wear due to linear materials, and further using such an extrusion apparatus. An object is to provide a method for producing a rubber-coated wire.

  In order to solve the above-described problems, in the present invention, an introduction hole for introducing a linear material into a rubber flow channel and a linear material from the rubber flow channel are formed on the opposing surface of the head body in which the rubber flow channel is formed. The guide hole of the guide die arranged to cover the lead-in hole is formed with a lead-out hole to be led out, and a linear member is introduced into the rubber flow path from the guide hole of the guide member arranged to cover the lead-in hole. An extrusion apparatus having a rubber-coated head for delivering a rubber-coated linear material from a plurality of the introduction holes, each of which has a cylindrical guide member having a guide hole, and each guide A fixing means is provided for fixing the member by sandwiching it between the head body and each guide member is movable in the radial direction of the introduction hole by adjusting the pressing force of the fixing means against the guide member. To do.

  According to the above configuration, each guide member can be moved in the radial direction of the introduction hole by the fixing means. Therefore, the guide member can be moved so that the central axis of the guide member coincides with the central axis of the linear member. Accordingly, uneven wear of the guide member due to the linear material can be prevented, and an extrusion apparatus including a rubber-coated head that can be used for a long period of time can be provided.

  Further, in the past, a plate-shaped code guide was used and attached to the rubber-coated head, whereas in the present invention, the number of linear holes to be introduced is formed in the rubber-coated head, Since the guide member is separately arranged in each introduction hole, even when uneven wear occurs in any of the guide members, only the guide member needs to be replaced, and the running cost of the extrusion device can be reduced. .

  It is preferable that the guide member be movable within a limited range so that the outer surface portion and the inner surface portion thereof do not reach the peripheral edge portion of the introduction hole. By making the guide member movable within such a limited range, it is possible to reliably prevent the linear material from coming into contact with the introduction hole and wearing it, and a gap is formed between the guide member and the introduction hole. It is possible to prevent the rubber from leaking.

  In order to move the guide member within a limited range, as fixing means, a guide member holder that sandwiches each guide member between the head body and a pressing means that presses the guide member against the head body via the guide member holder; The guide member holder includes a receiving portion for receiving the guide member, and the receiving portion is formed to have a diameter larger than the diameter of the guide member, and the guide member can slide on the head body in the receiving portion. And it is sufficient. The accommodating portion for accommodating the guide member may be provided not on the guide member holder side but on the head main body side.

  In order to make the guide member slidable on the surface of the head main body, the outer diameter of the guide member may be made larger than the diameter of the introduction hole formed on the surface of the head main body. Moreover, what is necessary is just to form so that an introduction hole diameter may become larger than a guide hole diameter, so that a linear material may not contact an introduction hole.

  As the guide member, a metal member can be used, but a ceramic member is preferably used from the viewpoint of high strength and excellent wear resistance. Examples of ceramics include alumina.

  As in the past, the extrusion die may be a plate having a plurality of extrusion holes, which may be attached to a lead-out hole formed in the same shape as the extrusion die, but facing the introduction hole. As with the guide member, the extrusion die is made of ceramics and is formed in a cylindrical shape with an extrusion hole at the center, and installed so as to cover each extraction hole. For example, it is excellent in durability, and even when uneven wear occurs in any of the extrusion dies, only the extrusion dies need to be replaced, and the running cost of the extrusion apparatus can be reduced.

  When using a cylindrical guide member and extrusion die made of ceramics, it is preferable to perform R processing on the upstream peripheral portion in the linear material moving direction in the guide hole and extrusion hole, Even if the central axis of the linear material guided to the guide hole and the central axis of the guide hole are not concentric, contact wear between the linear material guided to the guide hole and the R processed portion of the guide hole can be reduced. Further, the R processing of the extrusion hole makes it easier for the coated rubber to flow into the extrusion hole, so that it is possible to smoothly fill the inside of the linear material with the coated rubber and coat the rubber outside the linear material. It is preferable that the radius of curvature of the upstream peripheral portion of the guide hole and the extrusion hole subjected to the R processing is larger than the radius of the linear material.

  If the extrusion apparatus which concerns on this invention is used, the thing of the form of the rubber tape containing a linear material which the rubber-coated linear material adhere | attached the thing of the form where the rubber-coated linear material was arranged in multiple numbers can be obtained. When changing the width of the final product, a stopper without a hole may be used instead of the cylindrical guide member and the extrusion die. Thereby, it becomes possible to arbitrarily change the width of the final product.

  The linear material used in the present invention is not particularly limited as long as it is used while being covered with rubber, but it is preferable to use a cord in which a plurality of sheath strands are twisted together such as a steel cord. In particular, a cord having a hollow structure is preferably used.

  That is, when a cord having a hollow structure is used as a linear member, when the cord is introduced into the rubber flow path in the head body, the high-pressure coated rubber supplied from the extruder into the rubber flow path is placed inside the cord. Intrusions, which causes the cord to expand. Accordingly, the gap between the cord and the guide hole becomes narrower, the two are easily brought into contact with each other, and the guide hole wall is likely to be worn. Therefore, the cord and the guide hole are particularly preferably used in the extrusion apparatus according to the present invention.

  Here, the cord having a hollow structure refers to a structure in which a space (hollow portion) surrounded by a sheath strand is formed at the cord center by twisting a plurality of sheath strands arranged around the cord center. . Specific examples of the hollow structure include a structure having only a sheath strand and no core strand, and even if it has a core strand, its diameter is sufficiently smaller than that of the hollow portion. That's fine.

  Next, a method for producing a rubber-coated wire material using the extrusion device will be described. The method for producing a rubber-coated linear material according to the present invention uses the above-described extrusion device, introduces a linear material from the guide hole while supplying the coated rubber to the rubber flow path under pressure, and introduces the rubber-coated wire from the extrusion hole. In the method for producing a rubber-coated linear material for feeding the linear material, prior to the production of the rubber-coated linear material, the supply pressure of the coated rubber to the rubber flow path is set to a lower pressure than during the production of the rubber-coated linear material, and The guide member is automatically slid by the pressure of the covering rubber to flow backward from the guide hole by making the moving speed of the linear member slower than that at the time of manufacturing the rubber-coated linear member, and the center of the guide member After aligning the shaft and the central axis of the linear material, an alignment process is performed in which the guide member is fixed by a fixing means, and then the rubber-coated linear material is manufactured.

  According to the above configuration, in the aligning process, the pressing force applied to the guide member by the fixing means is loosened, so that the guide member is automatically used by utilizing the force that the covering rubber tries to flow backward from the guide hole. The plurality of guide members arranged in the introduction hole can be easily aligned, and can be used for a long time while suppressing wear of the guide members.

  In the present invention, a plurality of introduction holes for introducing a linear material into the rubber-coated head are formed, and cylindrical guide members made of ceramics and having a guide hole at the center are arranged in each introduction hole. Is provided between the head body and the guide member so as to be slidable on the head body by adjusting the pressing force of the fixing means against the guide member. The guide member can be slid so that the central axis of the linear material coincides with the linear material, thereby preventing uneven wear of the guide member due to the linear material, and an extrusion equipped with a rubber-coated head that can be used for a long period of time. An apparatus can be provided.

  The present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a rubber-coated head of an extrusion apparatus according to the present invention, and FIG. 2 is a front view of a halved head body constituting the rubber-coated head as viewed from the rubber flow path side. FIG. 3 is a partially enlarged view of FIG.

  As shown in FIGS. 1 and 2, the extrusion apparatus according to the present invention includes a rubber-coated head 1 and a rubber extruder 2 connected to the base side of the rubber-coated head 1. The coated rubber 3 is supplied to the rubber-coated head 1.

  The rubber-coated head 1 includes a cylindrical head main body 5 having a rubber flow path 4 therein and a plurality of linear members 6 formed in pairs so as to be opposed to each other on the opposing surface of the head main body 5. The hole 7 and the lead-out hole 8, the guide member 9 arranged so as to cover the introduction hole on the surface of the head main body 5, the guide member holder 10 for sandwiching the guide member 9 between the head main body 5 and the lead-out hole 8 An extrusion die 11 disposed so as to be covered and a die holder 12 for sandwiching the extrusion die 11 between the head main body 5 are provided.

  The wire 6 passes through the guide member 9 and is introduced into the head main body 1 from the introduction hole 7, passes through the rubber flow path 4, and then is formed by the extrusion die 11 through the lead-out hole 8 to be rubber-coated wire. The material 19 is sent out.

  As pressing means 16 for pressing the guide member 9 and the extrusion die 11 against the head body 5, a bolt 13 and a female screw portion 14 formed on the die holder 12 are provided. The pressing means 16 and the guide member holder 10 constitute a fixing means 17 for fixing the guide member 9.

  Bolt holes 15 are formed in the guide member holder 10 and the head body 5. The pressing force on the guide member 9 can be adjusted as the pressing means 16 by inserting the bolt 13 into the bolt hole 15 and screwing it into the female screw portion 14 to adjust the screwing force.

  The head main body 5 is composed of an introduction side main body 5 a and a lead-out side main body 5 b which are divided into two in the axial direction A, and the extruder 2 is connected to a base portion on one end side in the axial direction of the head main body 5. A plurality of introduction holes 7 and lead-out holes 8 are formed along the axial direction A in the lead-side main body 5a and the lead-out side main body 5b, respectively. In the present embodiment, the introduction holes 7 and the lead-out holes 8 are formed in two staggered rows along the axial direction A. However, the present invention is not limited to this, and may be formed in one row on a straight line. Is possible.

  A guide member 9 is disposed on the surface of the head body 5 where the introduction hole 7 is formed so as to cover the introduction hole 7 for each introduction hole 7. An extrusion die 11 is arranged on the surface of the head body 5 where the lead-out hole 8 is formed so as to cover the lead-out hole 8 for each lead-out hole 8.

  As shown in FIG. 3, the guide member 9 is made of a ceramic made of alumina and is formed in a cylindrical shape having a guide hole 18 of the linear material 6 in the center, and the extrusion die 11 is also made of the same material ceramic. It is formed in a cylindrical shape having an extrusion hole 20 for extruding the rubber-coated linear material 19 at the center. In both the guide member 9 and the extrusion die 11, R processing is applied to the upstream peripheral portion in the movement direction B of the linear material 6 in the guide hole 18 and the extrusion hole 20.

  In the lead-out hole 8, a diameter-expanded portion 24 is formed at the downstream end portion in the movement direction B of the linear material 6, and the extrusion die 11 is fitted into the diameter-expanded portion 24, and further on the downstream side. A die holder 12 is disposed to hold the extrusion die 11 in the enlarged diameter portion 24 while pressing it against the head body 5. The die holder 12 is formed with a through-hole 25 for allowing the linear material to pass through with a smaller diameter than the extrusion die 11.

  The linear member 6 in the present embodiment is a cord that is suitably used for reinforcement of a pumping tube or the like used in a squeeze pump, and does not have a core strand and is a hollow in which sheath strands 23 are twisted together A structural twisted cord is used. The change in the cord diameter of the hollow cord 6 will be described with reference to the cord cross-sectional views shown in FIGS. 4 to 6. FIG. 4 is a cross-sectional view of the cord at point X in FIG. 3 is a code cross-sectional view at a point Y in FIG. 3, and FIG. 6 is a code cross-sectional view at a point Z in FIG.

  That is, the cord diameter at the point X before introduction of the rubber-coated head 1 is the smallest (FIG. 4), and the coated rubber enters the cord 6 at the point Y in the guide hole affected by the rubber pressure of the rubber flow path 4. The cord expands (FIG. 5), and the cord is covered with rubber at the point Z after passing through the extrusion hole 20 (FIG. 6).

  Accordingly, the diameter of the guide hole 18 of the guide member 9 is such that the expanded cord 6 can pass without contacting the guide hole 18 and the coated rubber 3 flows backward from the guide hole 18 when the rubber-coated linear material is manufactured. The size is set so as not to leak. The diameter of the extrusion hole 20 of the extrusion die 11 is set to be larger than the diameter of the guide hole 18 in order to cover the surface of the cord 6 with the coating rubber 3.

  FIG. 7 is a front view of the guide member holder as viewed from the accommodating portion side. The guide member holder 10 is formed in a plate shape, and on the surface thereof, concave housing portions 21 for housing the guide members 9 are formed side by side along the axial direction A in two rows. A through hole 22 is formed in the center of the accommodating portion 21 and has a diameter smaller than that of the guide member 9 and allows the linear material (cord) 6 to pass therethrough.

  The accommodating portion 21 is formed to have a larger diameter than the guide member 9, and the guide member 9 slides in the radial direction of the introduction hole 7 (on the surface of the head main body 5 in this embodiment) within the range of the accommodating portion 21. It is possible to move. The accommodating portion 21 is formed to a depth at which the guide member 9 is slightly exposed from the surface of the guide member holder 10 when the guide member 9 is accommodated in the accommodating portion 21.

  In order to manufacture the rubber-coated linear material 19 using the extrusion device having the above-described configuration, first, the bolt 13 of the rubber-coated head 1 is loosened as an alignment process prior to the actual manufacturing of the rubber-coated linear material 19. Then, the guide member 9 in the accommodating portion 21 is made slidable, and the cord 6 is inserted into the introduction hole 7 and the lead-out hole 8 so that the cord 6 is moved at a lower speed than when the rubber-coated wire 19 is manufactured. Move in the code moving direction B. Further, the rubber pressure of the coated rubber 3 supplied from the extruder 2 to the rubber-coated head 1 is set to be lower than that during the production of the rubber-coated linear material 19 (for example, when the rubber pressure is set to 10 MPa during the production, Then, 5 MPa).

  The rubber pressure will be described. When a cord is covered with a rubber using an extrusion device, it is necessary to fill the inside of the cord with a covering rubber in order to improve the durability and the bending resistance of the cord after the rubber coating. . Therefore, when manufacturing the rubber-coated linear material, the rubber pressure in the rubber flow path 4 is set high so that the coated rubber 3 enters the inside of the cord 6.

  However, when the rubber pressure is increased, the cord 6 expands and the gap between the cord 6 and the guide hole 18 becomes narrow. Therefore, in order to ensure the gap between the cord 6 and the guide hole 18, The coated rubber 3 may be supplied to the rubber flow path 4 with a rubber pressure that does not cause the cord 6 to expand.

  By the above operation, the covering rubber 3 pressurized and supplied to the rubber flow path 4 in the alignment process flows backward from the gap between the cord 6 and the guide hole 18 (approaches to flow in the direction opposite to the cord moving direction B). ). At this time, since the covering rubber 3 tends to flow evenly around the cord 6, the guide member 9 has a center axis 9 a of the guide member 9 and a center axis 6 a of the cord 6 by the action of the flowing covering rubber 3. The head body 5 is automatically slid so as to match.

  After the guide member 9 and the cord 6 are centered, the guide member 9 is fixed by strongly tightening the bolt 13 of the pressing means 16. After the alignment process is completed in this way, the moving speed of the cord 6 is increased and the supply pressure of the covering rubber is increased to return to the actual manufacturing conditions of the rubber-coated wire material 19. As a result, it is possible to obtain an extrusion apparatus including the rubber-coated head 1 that is less worn by the linear material (cord) 6 and that can be used for a long period of time by exchanging the minimum components (guide member 9 and extrusion die 11). In addition, the rubber-coated linear material 19 manufactured by using the extrusion apparatus according to the present invention can form a rubber layer having a uniform thickness around the cord.

Sectional drawing which shows the rubber coating head of the extrusion apparatus which concerns on this invention The front view which looked at the introduction side main part which constitutes the above-mentioned rubber covering head from the rubber channel side Partial enlarged view of FIG. Cross section of the cord before being introduced into the rubber-coated head Cross-sectional view of the cord after being introduced into the rubber-coated head Cross section of rubber coated wire Front view of the guide member holder as seen from the housing side

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rubber coating head 2 Extruder 3 Coated rubber 4 Rubber flow path 5 Head main body 5a Introduction side main body 5b Derivation side main body 6 Linear material 7 Introduction hole 8 Outlet hole 9 Guide member 10 Guide member holder 11 Extrusion die 12 Die holder 13 Bolt DESCRIPTION OF SYMBOLS 14 Female thread part 15 Bolt hole 16 Pressing means 17 Fixing means 18 Guide hole 19 Rubber covering linear material 20 Extrusion hole 21 Accommodating part 22 Through-hole 23 Sheath strand 24 Expanded part 25 Through-hole A Axial direction B Movement of linear material direction

Claims (8)

An introduction hole for introducing the linear material into the rubber flow channel and a lead-out hole for extracting the linear material from the rubber flow channel are formed on the opposing surface of the head body in which the rubber flow channel is formed. A rubber-coated head that introduces a linear material into a rubber flow path from a guide hole of a guide member arranged so as to cover and feeds the rubber-coated linear material from an extrusion hole of an extrusion die arranged so as to cover the outlet hole A plurality of introduction holes are formed, and cylindrical guide members each having a guide hole are arranged in each introduction hole, and each guide member is sandwiched between the head body and fixed. An extrusion apparatus characterized in that a fixing means is provided and each guide member is movable in the radial direction of the introduction hole by adjusting a pressing force of the fixing means against the guide member. The fixing means includes a guide member holder that sandwiches each guide member with the head main body, and a pressing means that presses the guide member against the head main body via the guide member holder. An accommodating portion is provided, wherein the accommodating portion is formed with a diameter larger than a diameter of the guide member, and the guide member is slidable on the head body within the range of the accommodating portion. The extrusion apparatus according to 1. The extrusion apparatus according to claim 1 or 2, wherein the guide member is made of ceramics. The extrusion apparatus according to claim 1, 2, or 3, wherein a plurality of lead-out holes are formed, and cylindrical lead-out dies made of ceramics and having a push-out hole at the center are arranged in each lead-out hole. . The extrusion apparatus according to claim 4, wherein R processing is performed on an upstream peripheral portion of the guide hole and the extrusion hole. 6. An extrusion apparatus according to claim 5, wherein the radius of curvature of the upstream peripheral portion of the guide hole and the extrusion hole is set to be larger than the radius of the linear material. The extrusion apparatus according to any one of claims 1 to 6, wherein the linear material is a cord having a hollow structure in which a plurality of sheath strands are twisted together. Using the extrusion apparatus according to any one of claims 1 to 7, while supplying a coating rubber to the rubber flow path under pressure, a linear material is introduced from the guide hole, and a rubber-coated linear material is introduced from the extrusion hole. In the manufacturing method of the rubber-coated linear material to be sent out, prior to the production of the rubber-coated linear material, the supply pressure of the coated rubber to the rubber flow path is lower than that at the time of manufacturing the rubber-coated linear material, and the linear By making the moving speed of the material slower than that at the time of manufacturing the rubber-coated linear material, the guide member is automatically slid by the pressure of the coated rubber to flow backward from the guide hole, and the guide member's central axis and line A method for producing a rubber-coated linear material, comprising: aligning a central axis of a linear material, fixing a guide member by a fixing means, and thereafter producing a rubber-coated linear material.

Images