JP2005212297A - Belt molding mold and its production method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a belt molding mold which prevents the permanent deformation of a projected part and a channel-like part to improve the usage count of the mold, maintains the dimensional precision of the height of the cog part of a molded belt sleeve over a long time, and is improved in mold release properties and thermal conductivity and a method for producing the mold. <P>SOLUTION: In the belt molding mold 1 used in the molding of a transmission belt having a cog part in which cog crest parts and cog trough parts are arranged alternately in at least a compressed rubber layer, an elastomer layer 9 is laminated on the inside of a corrugating metal plate 7 to fill at least the inside of a projected part 5. A cylindrical mold 3 with the elastomer layer 9 coated with a reinforcing material 8 is fitted/fixed to a molding drum 2 to make the corrugating plate 7 a molding surface. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a belt molding die and a method for manufacturing the same, and more specifically, a cylindrical base mold in which a rubber sheet is filled in a groove portion of a metal corrugated plate and a reinforcing material is laminated on the surface is mounted on a molding drum. The present invention relates to a fixed belt molding die and a method for manufacturing the same.

  2. Description of the Related Art Conventionally, in a drive system in the mechanical field for scooters or general industries, a belt-type transmission that suspends a transmission belt between a driving pulley and a driven pulley and changes the effective diameter of the pulley to change the speed is used. The power transmission belt used here has a cog portion in which a cog crest portion and a cog trough portion are alternately arranged on at least one of the compression rubber layer and the stretch rubber layer, and the core wire is placed in the adhesive rubber layer. Low-edge cogged belts such as a low-edge single cogged belt or a low-edge double cogged belt are known.

  As a manufacturing method of the low edge cogged belt, a molding die is used in which a cylindrical mother die made of vulcanized rubber in which protrusions and grooves are alternately arranged is inserted into a cylindrical molding drum. Reinforcement cloth, rubber sheet of stretch rubber layer, core wire, rubber sheet of compression rubber layer, and inner reinforcement cloth are wound in order and vulcanized after inserting the cylindrical jacket. Reinforcement cloth by pressure during vulcanization There is a method in which the rubber sheet of the compressed rubber layer is molded by shrinking. (For example, disclosed in Patent Document 1)

  As another method, a non-vulcanized rubber sheet is placed on a flat grooved mold longer than the belt circumference prepared in advance, and a cog pad molded into a cog shape by heating and pressing with a press is produced. To do. This cog pad is fitted into the projecting part and groove part of the cylindrical master mold mounted on the molding drum, and the cut surface of the cog pad is abutted and joined, and then the core wire is wound, and another rubber layer and reinforcing cloth are attached. After wrapping from above, the molding was completed and the process was shifted to the vulcanization process. (For example, it is disclosed in Patent Document 2.)

  However, in the conventional mold, since the cylindrical base is vulcanized rubber, the rigidity of the protrusion and the groove is small, the deformation is easy and the number of uses is limited, and the protrusion is limited by the compression force. However, there is a problem that the groove-shaped part is easily deformed and the height of the cog part changes and becomes small. Furthermore, many mold release agents such as silicone oil are required to obtain the mold release property between the cylindrical mother die and the belt sleeve, and the mold release agent adheres to the protruding and groove-like portions that are easily deformed. Therefore, it is difficult to remove, and the thermal conductivity of the internal pressure heat for heating the inside of the mold is low, so that the thermal efficiency may be deteriorated.

US Pat. No. 3,464,875 JP 2002-1691 A

  The problem to be solved is to solve the above problems, prevent permanent deformation of the projecting part and the groove part, improve the number of times the mold is used, and measure the height of the cog part of the molded belt sleeve. Provided are a belt molding die that maintains accuracy over a long period of time and has improved releasability and thermal conductivity, and a method for manufacturing the same.

  The invention according to claims 1 to 3 of the present application is a belt molding die used for molding a transmission belt having a cog portion in which a cog crest portion and a cog valley portion are alternately arranged on at least a compression rubber layer, An elastic layer is laminated inside the corrugated plate so as to fill the inside of the ridge, and a cylindrical master mold in which the elastic layer is coated with a reinforcing material is formed so that the corrugated plate becomes the molding surface. When the belt molding die is attached and fixed to the drum, and the reinforcing material is canvas, or when the corrugated metal plate at the end of the cylindrical base is fixed directly to the molding drum by welding Is included.

The invention according to claims 4 to 7 of the present application is a method for producing a belt molding die used for molding a transmission belt having cogs formed by alternately arranging cogs and cogs on at least a compression rubber layer.
A corrugated plate is formed by passing a metal plate through a pair of forming rollers, and the corrugated plate, an unvulcanized rubber sheet, and a reinforcing material are sequentially laminated and heated on a master mold having grooves at predetermined intervals. An open-end mold is formed by pressurization, and the end of the open-end mold is jointed to produce a cylindrical mold, and the cylindrical mold is attached to a molding drum and fixed. If the reinforcing material is canvas, the corrugated plate exposed at the end of the cylindrical master is fixed to the forming drum by welding, and after the end of the open end master is butted This includes the case of jointing using a press.

  In the present invention, the ridges and grooves of the mother mold with increased rigidity are hard to be permanently deformed, and the number of times the mold is used is further improved, thereby reducing the variation in the height of the cog part of the belt sleeve. The dimensional accuracy can be maintained over a long period of time, and the metal corrugated plate on the surface of the master mold improves the releasability from the belt sleeve, improving the formability of the belt and improving the thermal conductivity. Moreover, the usage-amount of a mold release agent can be reduced.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partial perspective view of a belt molding die in which a cylindrical mother die is attached to a molding drum by welding, and FIG. 2 is a cross-sectional view in the AA direction in FIG.

  The belt molding die 1 according to the present invention is used for molding a transmission belt having cogs formed by alternately arranging cogs and cogs on at least a compression rubber layer. A cylindrical mother die 3 is mounted and fixed. The cylindrical mother die 3 has grooves 4 and ridges 5 alternately forming a cog valley portion and a cog mountain portion of the transmission belt as an appearance, and a plurality of welding locations 6 are provided at the end portions of the cylindrical mother die 3. And fixed to the forming drum 2.

  The cylindrical mother die 3 is made of vulcanized rubber or the like so as to fill at least the inside of the protruding portion 5 inside the corrugated plate 7 having a thickness of 0.1 to 0.5 mm made of stainless steel or an alloy metal thereof. The number of uses of the mold 1 can be increased by laminating the elastic body layer 9 to elastically support the corrugated plate 7 and elastically deforming the groove 4 and the protrusion 5 when the mold is used. A reinforcing material 8 such as canvas, knitted fabric, or non-woven fabric covers the surface of the elastic body layer 9 to improve the durability of the elastic body layer 9.

  The manufacturing process of the cylindrical mother die 3 is shown in FIGS. FIG. 3 shows a perspective view of a process of forming a corrugated plate by passing a metal plate through a pair of forming rollers. The groove-like processed portion 12 having a shape that matches the shape of the cogged portion of the belt and a projecting process are shown on the surface. The forming rollers 11 and 11 provided with the portion 13 are rotated in a state where the groove-shaped processed portions 12 and the protruding processed portions 13 are arranged so as to mesh with each other, and the thickness between the forming rollers 11 and 11 is 0.1. The corrugated plate 7 is formed through a metal plate 10 of 0.5 mm. In this case, a sheet guide 15 having a side wall 17 attached to the bottom plate 16 is provided in a region where the metal plate 10 is fed into the forming rolls 11, 11 so that the metal plate 10 moves straight. The metal plate 10 has a width of 200 to 400 mm and a length that matches the molding surface length.

  FIG. 4 is a perspective view of the corrugated plate 7 obtained in the process shown in FIG. 3. The corrugated plate 7 alternates the grooves 4 and the protrusions 5 in a direction intersecting the flow direction of the metal plate 10. Have.

  Subsequently, as shown in FIG. 5, an open-end matrix 20 is manufactured using the corrugated plate 7. As shown in the figure, a flat plate-shaped mold 21 having groove portions 22 with a predetermined interval is installed on a lower plate 23 of a press, and one or a plurality of corrugated plates 7 are formed on the mold mold 21 by the ridges 5. The unvulcanized rubber sheet 24 and the reinforcing material 8 are sequentially laminated thereon, and then heated at 120 to 160 ° C., and the upper board 27 is lowered and applied at a predetermined pressure. The open end matrix 20 is molded by pressing and vulcanization.

  The unvulcanized rubber sheet 24 used here is one material for forming the elastic layer 9, and is made of natural rubber, butyl rubber, styrene-butadiene rubber, chloroprene rubber, ethylene / α-olefin rubber, alkylated chlorosulfanated. A rubber material such as polyethylene (ACSM), hydrogenated nitrile rubber (H-NBR), a mixed polymer of hydrogenated nitrile rubber and an unsaturated carboxylic acid metal salt, or a mixture thereof is used as a raw rubber and added to this. Known compounding agents such as a vulcanizing agent, a vulcanization aid, a filler, and a reinforcing agent are included.

  The reinforcing material 8 is made of cotton, polyester fiber, nylon, or the like, and is a canvas woven in a plain weave, a twill weave, a satin weave, or the like, and may be a wide angle canvas in which a crossing angle between warp and weft is about 90 to 120 °. The reinforcing cloth 7 is subjected to RFL treatment, and then the rubber composition is subjected to fiction and coaching to obtain a canvas with rubber. The RFL liquid is obtained by mixing an initial condensate of resorcin and formaldehyde into a latex. Examples of the latex used here include chloroprene, styrene / butadiene / vinylpyridine terpolymer, hydrogenated nitrile, NBR, and the like. Moreover, not only a canvas but a knitted fabric and a nonwoven fabric may be sufficient.

  As shown in FIG. 6, the obtained open-end matrix 20 has a corrugated plate 7 having grooves 4 and ridges 5 alternately, and fills the inside of the ridges 5 inside thereof. The elastic body layer 9 is composed of laminated vulcanized rubber, and the reinforcing material 8 is laminated on the surface of the elastic body layer 9.

  Subsequently, the end portion 28 of the open-end matrix 20 is joined endlessly as shown in FIG. Here, one end 29 and the other end 30 of the open-end mother die 20 are abutted against the mother die 21 installed on the lower plate 23 of the press shown in FIG. 8 is cut to expose the corrugated plate 7 and the elastic layer 9, and the corrugated plate 7 and the elastic layer 9 are similarly exposed at the other end 30 to leave the peeled reinforcing material 8. After mounting a new unvulcanized rubber sheet 24 on the exposed corrugated plate 7 and laminating the peeled reinforcing material 8, the lower plate 23 and the upper plate 27 are sandwiched in the same manner and heated and pressed to make it endless. It joins and the cylindrical mother die 3 is produced.

  Then, the cylindrical mother die 3 is mounted on the forming drum 2 as shown in FIG. In this case, the compressed air 32 is fed into the closed space 33 formed when the cylindrical mother die 3 is pushed into the molding drum 2 by the pressing plate 34 and is inserted into the molding drum 2 while the cylindrical mother die 3 is expanded. To do. For this reason, the cylindrical mother die 3 adheres to the molding drum 2 while being hugged.

  The elastic body layer 9 and the reinforcing material 8 in the groove portion 4 at the end of the cylindrical mother die 3 are removed, and the corrugated plate 7 is welded at several places and fixed to the forming drum 2. Of course, before attaching the cylindrical mother die 3 to the molding drum 2, the elastic body layer 9 and the reinforcing material 8 in the groove 4 at the end of the cylindrical mother die 3 are removed, and the corrugated plate 7 is removed. It may be exposed.

  The belt molding die and the manufacturing method thereof according to the present invention can be used for manufacturing a cogged belt used as a transmission belt for snowmobiles, scooters and general industries.

1 is a partial perspective view of a belt molding die according to the present invention. It is sectional drawing of the AA direction in FIG. The schematic diagram of the process of forming a corrugated board by letting a metal plate pass through a pair of forming rollers in the manufacturing method of the present invention is shown. FIG. 4 is a perspective view of a corrugated plate obtained in the step shown in FIG. 3. It is the schematic of the process of producing an open end mother block in the manufacturing method of the present invention. FIG. 6 is a cross-sectional view of an open-end matrix obtained by the method of FIG. It is the schematic of the process of joining the edge part of an open end mother block | endlessly in the manufacturing method of this invention. It is the schematic of the process of mounting | wearing a cylindrical mother die to a forming drum in the manufacturing method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Belt mold | die 2 Molding drum 3 Cylindrical mother mold 4 Groove part 5 Projection part 6 Welded part 7 Corrugated processing board 8 Reinforcement material 9 Elastic body layer 10 Metal plate 11 Forming roller 12 Groove process part 13 Projection shape Machining part 20 Open-end matrix

Claims (7)

A belt molding die used for molding a transmission belt having a cog portion in which a cog crest portion and a cog valley portion are alternately arranged on a compressed rubber layer,
An elastic layer is laminated inside the corrugated plate made of metal so that at least the inside of the ridge is filled, and the corrugated plate is formed on the molding surface by covering the elastic layer with a reinforcing material. A mold for forming a belt, which is mounted on a forming drum and fixed.   The belt molding die according to claim 1, wherein the reinforcing material is canvas.   The belt molding die according to claim 1 or 2, wherein a metal corrugated plate existing at an end of the cylindrical master die is fixed directly to the molding drum by welding. It is a manufacturing method of a belt molding die used for molding a power transmission belt having a cog portion in which a cog crest portion and a cog valley portion are alternately arranged in a compressed rubber layer,
A corrugated plate is formed by passing a metal plate through a pair of forming rollers,
The corrugated plate, unvulcanized rubber sheet, and reinforcing material are sequentially laminated on a master mold having grooves at predetermined intervals, and heated and pressed to form an open-end master mold,
Join the end of the above open-end matrix to make a cylindrical matrix,
The cylindrical mother die was attached to a molding drum and fixed,
A method for producing a belt molding die.   The method for producing a mold for belt molding according to claim 4, wherein the reinforcing material is canvas.   6. The method for manufacturing a belt molding die according to claim 4 or 5, wherein the corrugated plate exposed at the end of the cylindrical mother die is fixed to the molding drum by welding. The method for manufacturing a belt molding die according to claim 4, wherein the end portions of the open-end matrix are abutted and then jointed using a press.

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