JP4907785B2 - Double V-ribbed belt manufacturing method and molding press apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a manufacturing process of a double V-ribbed belt having a plurality of rib portions extending in the belt longitudinal direction on both upper and lower surfaces of an adhesive rubber layer in which a core wire is embedded. The present invention relates to a transmission belt manufacturing technique in which a rib rubber is formed of a rubber composition made of an EPDM material having poor adhesion.
[0002]
[Prior art]
With the progress of space-saving design, such as improving the fuel efficiency of vehicles by reducing weight, etc., a double V-ribbed belt that is excellent in back drive by installing ribs on the back of the belt that can drive multiple pulleys with a single belt is suitably used Conventionally, natural rubber, styrene-butadiene rubber and chloroprene rubber materials have been mainly used as the constituent materials.
[0003]
However, in recent years, a double V-ribbed belt using an ethylene-α-olefin elastomer such as ethylene-propylene-diene rubber (EPDM), which is further excellent in heat resistance, has been provided along with the high temperature of the atmosphere resulting from space saving. The applicant of the present application also has a proposal in Japanese Patent Laid-Open No. 2000-283246.
[0004]
[Problems to be solved by the invention]
However, in the manufacturing process of the transmission belt using this EPDM material, the adhesiveness is inferior compared with the conventional material, and in particular, sheet-like upper and lower rib parts are wound around the outer periphery of the cylindrical mold, and both ends are jointed. In addition to conventional molding methods and equipment, the laminating molding process has problems such as preheating and crimping processes that assist adhesion, and labor such as tape fastening and extra materials, and transmission with a canvas setting process. Regarding the belt, a belt described in Japanese Patent Application Laid-Open No. 2000-334856 has been proposed.
[0005]
The present invention has the above-described problem. Adhesive It has poor performance and requires time and effort to hold the molding, and improves the process with variations in work. It consists of EPDM material, Adhesive The manufacturing process of double V-ribbed belts using an inferior adhesive rubber layer and upper and lower rib rubber layers Adhesive An object of the present invention is to provide a technology capable of efficiently co-production with the belt made of a chloroprene rubber material having excellent properties.
[0006]
[Means for Solving the Problems]
That is, in the manufacturing method according to claim 1 of the present invention, at least the reinforcing cloth is not disposed on the belt, and a plurality of rib portions extending in the belt longitudinal direction are provided on the upper and lower surfaces of the adhesive rubber layer in which the core wire is embedded, and the bonding Method for producing double V-ribbed belt using vulcanized rubber composition using ethylene-α-olefin elastomer as rubber layer and using ethylene-α-olefin elastomer for upper and lower rib portions provided on both sides of adhesive rubber layer , A first molding step in which the lower rib rubber is formed in a cylindrical shape in advance and fitted into a cylindrical mold, and a second molding step in which a core wire, which is a tensile body, is spirally wound on the outer peripheral surface. And a third molding step for endlessly winding the upper rib portion rubber on the outer peripheral surface of the wound body, Obtained by sequentially laminating the lower rib rubber, the core wire, and the upper rib rubber on the cylindrical mold It consists of a vulcanization process in which a molded body is vulcanized to create a vulcanized sleeve, and a grinding process in which both sides of the vulcanized sleeve are ground to create upper and lower ribs. This makes it easy to co-produce with the conventional method, making it easy to handle expansion.
[0007]
In the first molding step of covering the outer surface of the cylindrical mold that is easy to release from the surface of the cover canvas with the lower rib rubber having poor adhesion, the lower rib rubber is endlessly formed into a cylindrical body in advance. Can be covered by inserting into the mold.
[0008]
Furthermore, after the core wire which is a tensile body is spirally wound on the outer peripheral surface of the lower rib rubber, the inner surface side of the third molding step is formed on the outer peripheral surface which is inferior to each other but has no releasability. When the upper rib portion rubber having the adhesive rubber layer is covered, the upper rib portion rubber can be laminated except for the fitting and inserting step by winding the sheet body and making it endless.
[0009]
Each of the molding steps described above is performed, and the belt component material is laminated and molded on the cylindrical mold, and heated and pressurized in the vulcanization process to vulcanize. Sulfur sleeves are manufactured. A double ribbed belt can be manufactured by polishing the inner and outer surfaces of the sleeve with a grinding wheel having a rib crest shape and cutting it into a predetermined belt width. As described above, a double-ribbed belt can be manufactured using an EPDM material having poor adhesion.
[0010]
In the manufacturing method according to claim 2, at least a reinforcing cloth is not disposed on the belt, and the adhesive rubber layer includes a plurality of rib portions extending in the belt longitudinal direction on both upper and lower surfaces of the adhesive rubber layer in which the core wire is embedded. In a method for producing a double V-ribbed belt using a vulcanized rubber composition using an ethylene-α-olefin elastomer as the upper and lower rib portions provided on both sides of the adhesive rubber layer, using an ethylene-α-olefin elastomer. A first molding step in which the lower rib rubber is formed in a cylindrical shape in advance and fitted into a cylindrical mold, and a second molding step in which a core wire, which is a tensile body, is spirally wound on the outer peripheral surface; Furthermore, a third molding step of fitting and inserting an upper rib rubber formed in advance into a cylindrical shape on the outer peripheral surface of the wound body, Obtained by sequentially laminating the lower rib rubber, the core wire, and the upper rib rubber on the cylindrical mold It is characterized by comprising a vulcanization step of vulcanizing the molded body to produce a vulcanization sleeve and a grinding step of grinding both surfaces of the vulcanization sleeve to produce upper and lower rib portions. In particular, it can cope with the molding in which the molding variation of the double V-ribbed belt is prevented.
[0011]
In the present invention, when the upper rib rubber is covered in the third molding step, the upper rib rubber can be endlessly formed into a cylindrical body in advance. Can be inserted into the mold and covered. Therefore, the step of winding and joining the sheet body on the mold can be made unnecessary.
[0012]
In the manufacturing method according to claim 3 of the present application, the step of previously forming the lower rib rubber in the first molding step in a cylindrical shape in claim 1 The first molding step, the second molding step, the third molding step, and the vulcanization step are lined. This is an off-line setup for the molding line. According to this configuration, the upper rib rubber of the third molding process can be wound in-line by adding a preheating board to the conventional crimping part. Therefore, since the cylinder forming process can be performed in parallel in an off-line manner, an increase in manufacturing cycle can be minimized. Moreover, co-production using CR material and EPDM material is possible with simple and inexpensive investment.
[0013]
In the manufacturing method according to claim 4 of the present application, the step of forming the lower rib rubber of the first molding step and the upper rib rubber of the third molding step in a cylindrical shape in claim 2 in advance The first molding step, the second molding step, the third molding step, and the vulcanization step are lined. This is an off-line setup for the molding line. According to this configuration, the joint work requirements are further stabilized, and work variations can be minimized.
[0014]
In the manufacturing method according to claim 5 of the present invention, the lower rib rubber and the upper rib rubber each use a laminate in which the adhesive rubber layer is laminated in advance on a rib rubber layer containing short fibers. According to this configuration, the stacking process can be simplified by half, productivity can be secured, and the existing line can be utilized, so that co-production with the conventional product can be easily performed.
[0015]
In the manufacturing method according to claim 6 of the present invention, in the first molding step to be fitted and inserted into the cylindrical mold, the cylindrical mold with the cylindrical lower rib portion standing vertically and having the axial center vertical is viewed from above. It is to be inserted downward with the axes aligned. According to this configuration, the insertion process can be arranged during a series of operations in which the cylindrical mold is suspended by the lifting device and placed on the molding machine, so that the relatively heavy and soft can be handled in a stable posture. In addition, it is easy to assist human hands and can respond easily.
[0016]
In the molding press apparatus according to claim 7 of the present application, a rubber sheet having a predetermined length using an ethylene-α-olefin elastomer is rolled and both ends are joined together. Cylindrical body In the forming press device to be formed, it was joined with an openable upper heating plate and one end opened. Above A lower heating plate from which the tubular body can be removed; The rubber sheet A cradle that is wound around the lower heating plate, A front end of the rubber sheet on the side wound by the cradle on the upper surface of the lower heating plate and a rear end on the opposite side A clamp means for fixing the abutting portion is provided, and the cylindrical body can be easily produced offline by one person, and the investment for simplification can be made at low cost.
[0017]
In the molding press apparatus according to claim 8, Rubber sheet The cradle for winding the Rubber sheet If it is pushed forward, it is provided with guiding means whose front end is bent in a loop shape. According to this structure, if the front end is cut onto a predetermined length and placed on the receiving table The rubber sheet While being slid on the cradle, it can be wound so as to surround the lower heating plate by the guide means whose front end portion is constituted by a rotating roller body in a loop shape.
[0018]
In the molding press apparatus according to claim 9 of the present application, The butting part Clamping means for fixing the upper heating plate that can be pressed in the center, Rubber sheet The front end and the rear end can be individually held and operated. According to this, the joints can be positioned sequentially in order, and the clamped state can be maintained even during crimping, and they can be accurately stacked and abutted. I can do it.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a method for manufacturing a double V-ribbed belt and a forming press apparatus according to the present invention will be described with reference to FIGS. Prior to the description of each part of the present invention, the usage, member configuration and EPDM material regarding the double V-ribbed belt will be described.
[0020]
First, in use, a V-belt used in an automobile or the like mainly has a function of transmitting rotational power of an engine to a V-pulley of a driven shaft through a pulley at the end of its crankshaft. Examples of the driven machine include an alternator, a cooling fan, and a cooler. In order to save the space and reduce the cost of these rotary drives with a single V-belt, the drive using the windings and the back of the transfer belt is shortened due to the location of each device. This is desirable. Therefore, the double V-ribbed belt 1 is suitably used with the rib crest 7 and the rib trough 8 on the front and back of the belt, and contributes to the space saving of the engine room of the car, the reduction of the original height and the weight reduction. It is.
[0021]
Next, with respect to the belt member configuration of such a double V-ribbed belt 1, as shown in the partial cross-sectional perspective view of the product in FIG. 1, the cross section extending in the belt longitudinal direction on the upper and lower surfaces (front and back) of the belt A rib crest portion 7 and a rib trough portion 8 are provided, and can be suitably transmitted on both sides of the belt to the above-described requirements. 5 layers of vulcanized adhesive rubber form 5 layers of adhesive rubber to embed and protect the core wire 4 and polish the ribs and valleys on the upper and lower rib rubber 3 and 6 layers vulcanized. It is a belt manufactured in this way.
[0022]
Such a vulcanized belt is formed by vulcanizing the following unvulcanized laminated member. In the present invention, the vulcanized belt is particularly concerned with the laminated molding step before vulcanization, and details will be described later. As shown in FIG. 2, it is produced by laminating an unvulcanized member on the outer peripheral surface of the molding die M.
[0023]
That is, on the outer surface of the molding die M, first, the lower rib portion rubber 3 layer is formed in the first layer, the winding layer of the core wire 4 is formed in the second layer, the upper rib portion rubber 6 layer is formed in the third layer, It is formed by sequentially laminating. For the core wire 4 of the second layer, a high strength and low elongation cord made of polyester fiber, aramid fiber, or glass fiber is used. Further, the five layers of adhesive rubber will be described later in connection with the present invention, but are handled as an integral sheet that is previously doubling with a calendar 91 on one side of each of the rib rubbers 3 and 6.
[0024]
By the way, in recent years, due to cost reduction and environmental measures by dechlorination, with the review of the above-mentioned constituent materials, the material of the upper and lower rib rubbers 3 and 6 is an inexpensive ethylene-α-olefin elastomer having excellent heat resistance. EPDM is used as a typical example.
[0025]
The upper and lower rib rubbers 3 and 6 are made of a cross-linked ethylene-α-olefin elastomer, and the following short fibers are added thereto (from nylon 6, nylon 66, polyester, cotton, aramid). In addition to improving the lateral pressure resistance of the belt, the short fiber protrudes from the surface in contact with the pulley to reduce the coefficient of friction, thereby improving the noise characteristics during belt running.
[0026]
Next, the rubber of the above-mentioned ethylene-α-olefin elastomer is used for the purpose of improving the adhesiveness with the polyester fiber, the aramid fiber, the glass fiber and the like which are the core wire 4 and have heat resistance in the adhesive rubber 5 layer. The composition is used. The core 4 is also subjected to an adhesion treatment for the purpose of improving the adhesion to rubber.
[0027]
With the above review of EPDM materials, the following review is required in the manufacturing process. In other words, chloroprene rubber that has been used in the past is highly adhesive even at room temperature in an unvulcanized state. Therefore, the lower rib rubber 3 is wound around the outer periphery of the mold and cut, and the front and rear ends are joined by pressure bonding. Then, the core wire 4 is wound and placed on the upper surface while being spirally spun at a uniform pitch, the upper rib rubber 6 is wound on the upper surface, the rear end is cut and covered, and the front and rear ends are jointed and laminated. Using the method, the pressing process was sufficient for the joint process.
[0028]
However, since the EPDM material is used as the belt constituent material, it is poor in tackiness at room temperature and requires preheating for bonding. Therefore, in each joint process, the method of preheating is reviewed in addition to the pressing pressure.
[0029]
Further, in the double V-ribbed belt 1 according to the present invention, since there is no cover canvas in particular, it is laminated directly on the outer peripheral surface of the molding die M which is more slippery than the canvas surface. The endless work on the conventional molding die M can be simplified by forming the part rubbers 3 and 6 into a cylindrical body.
[0030]
Hereinafter, the manufacturing method of the double V ribbed belt 1 concerning this invention is explained in full detail. Further, the applicant of the present application has proposed Japanese Patent Application Laid-Open No. 2000-283246 specifying an EPDM member related to the double V-ribbed belt 1 prior to the present application, and Japanese Patent No. 2762238 related to double-side grinding of rib grooves with the double V-ribbed belt 1.
[0031]
The basic configuration of this manufacturing method will be described with reference to FIG. The manufacturing process is roughly divided into three, and one is a molding process P1 performed with a molding die as a central process, a preparation process P2 corresponding to the preceding process, and a finishing process P3 corresponding to the subsequent process.
[0032]
Next, the above-described forming step P1 mainly includes a forming step 100 in which a lower rib is formed, a core wire is wound in a spiral shape, and is spun to form an upper rib, and a vulcanizing step 103 including a cooling step 104 and a demolding step 105. Subsequently, in the finishing step P3, the vulcanized sleeve removed from the molding die is preliminarily cut into the processing width of the grinding machine, the rib crests are polished on the front and back, and the belt is cut into a single belt and inspected.
[0033]
Further, in the preparation process P2, the belt member used in the above-described molding process P1 is preliminarily processed, and here, the rib rubbers 3 and 6 are mainly endless in a cylindrical shape. Hereinafter, each will be described in detail with reference to FIGS.
[0034]
First, in the molding step 100, the upper and lower rib part rubber 3, 6 layers of a rubber composition crosslinkable with an organic peroxide using an ethylene-α-olefin elastomer and sulfur crosslinkable using an ethylene-α-olefin elastomer are possible. As shown in FIG. 2, the unvulcanized laminate is formed on the cylindrical surface of the cylindrical molding die M through the following three procedures using the adhesive rubber 5 layers of the rubber composition and the core wire 4. To form. The first procedure is a lower rib forming process, the second procedure is a spinning process, and the third procedure is an upper rib forming process.
[0035]
First, in the first rib lower rib forming step, as shown in FIG. 4, the lower rib rubber 3 made endless in a cylindrical shape is supplied from the outside of the line in a timely manner, and the swing frame of the belt forming machine 20 26 is installed on the centering metal fitting 27 on the same axis (a method for making the lower rib portion rubber 3 endless in a cylindrical shape will be described later).
[0036]
Next, the molding die M suspended by the lifting chain 34 is transported upward, stops positioning on the centering metal fitting 27, and is inserted while being lowered and supported by human hands. The molding die M is seated on the centering metal fitting 27 to prevent it from overturning, the swing frame 26 is rotated upright to change the die M to horizontal support, and the centering cylinder 28 is shown in the figure. The mold is connected and supported by the drive shaft 22 of the molding machine main body 21 by pressing to the right. In FIG. 2, the lower rib portion rubber 3 is put on the molding die M surface from the left side in the drawing.
[0037]
Next, in the spinning step of the second procedure, the front end of the predetermined core wire 4 set at a predetermined tension is locked to the end of the mold on the cylindrical outer surface of the lower rib rubber 3, and the mold M A predetermined axial feed amount per one rotation is given, and it is spirally wound at a constant pitch. In FIG. 2, a state in which the core wires 4 are arranged on the outer peripheral portion of the molding die M surface covered with the lower rib rubber 3 from the left side in the drawing is formed.
[0038]
Subsequently, in the upper rib forming step of the third procedure, the upper rib rubber 6 is put on the outer peripheral surface of the core wire 4 wound in the above-described spiral shape. Here, an upper rib rubber 6 cut to a predetermined length from a sheet mount (not shown) provided at the rear of the molding machine main body 21 is carried below the mold M, and the front end thereof is used as the mold M. To the joint part positioned above the mold M and pressed against the joint M 5 layers by pressing a pressure heating plate from the upper part of the belt molding machine 20 to make endless. As a result, the lower rib rubber 3 and the core wire are arranged on the surface of the molding die M in FIG. The upper rib rubber 6 is put on this upper surface and the molding is completed. Therefore, in this method, the conventional product can be produced at the same time as long as a joint press hot plate is added to the conventional device.
[0039]
After this lamination molding, the molding die M is erected by inverting the swing frame 26 under the lifting chain 34 in the reverse procedure at the time of start-up, integrally with the molding die M from the belt molding machine 20. Then, the mold chuck fitting 32 is connected from above, lifted to the ceiling, and carried to the next vulcanization step 103.
[0040]
Subsequently, in the vulcanization step 103, a vulcanized can having an unvulcanized cylindrical laminate having the cross section shown in FIG. A cylindrical rubber jacket is put inside, and the upper and lower surfaces are sealed with a bottom plate and an upper plate and placed. A sleeve 2 crosslinked on the mold M is obtained through a predetermined steam pressure and vulcanization time.
[0041]
After the cross-linking, the mold chuck metal fitting 32 is connected to the vulcanizing can, the lifting chain 34 is connected in the reverse procedure at the time of carrying in, the carry-out jacket is removed, and it is carried on the cooling step 104 (not shown). Then, the mold M suspended on the cooling nozzle base is inserted and seated from the center of the bottom, and the sleeve 2 cross-linked with the mold M is cooled to near room temperature by shower fountain from the inner surface of the mold M.
[0042]
Subsequently, the cooled sleeve 2 is lifted and carried together with the mold M and transferred to the demolding step 105. At the same time as being carried into a demolding step 105 (not shown) and seated on the table by pushing it up from the center hole at the bottom of the mold and holding the sleeve 2 by gripping it from the outer side with a plurality of pressing plates together with the bridged sleeve 2. , Extend the push-up cylinder and pull the mold upward . At this time, the lifting chain lifts the die that has been lifted while being lifted up at the same time, transports the emptied die to the next release processing step 106, and applies a release agent to the outer peripheral surface of the die. Finish one cycle and enter again.
[0043]
On the other hand, the cylindrical cross-linked sleeve 2 gripped in the demolding step 105 and removed from the molding die M is taken out by the transportable arm, transferred to the finishing step P3, and reserved in a sleeve width that can be turned over. Cut 107. The sleeve after the cut is transferred to the grinding step 108.
[0044]
In the grinding step 108, as shown in FIG. 12, a rib is applied to one surface of the sleeve by a grinding wheel 81 that is rotated while being hanged on a driving roll 82 and a driven roll 83 under a predetermined tension. The peaks 7 and the rib valleys 8 are polished.
[0045]
The sleeve is inverted and turned over, and a cartridge 84 having a plurality of grooves 85 and protrusions 86 arranged in the width direction as shown in FIG. 11 is mounted on the drive roll 82 and then hung on the drive roll 82 and the driven roll 83. Then, at least one rib valley portion 8 and rib crest portion 7 of the sleeve are engaged with and fitted into at least one protrusion 86 and groove 85 provided on the cartridge 84, respectively.
[0046]
The sleeve 2 is run under a predetermined tension, and the rotated grinding wheel 81 is brought into contact with the sleeve to grind the rib valley portion 8 on the other surface. A plurality of grooves are polished at a time.
[0047]
After polishing, the polishing powder adhering to the surface of the sleeve 2 is intensively removed by the suction device 88 so that the rotating brush 87 is brought into contact with the sleeve 2 while making one turn, so that there is no adhesion residue.
[0048]
In this way, the bridge sleeve having a plurality of groove portions on the front and back is removed from the drive roll 82 and the driven roll 83 of the sleeve polishing machine 80, and the bridge sleeve is moved to the belt width cutting step 109 to be driven with other drive rolls. The belt is run on a roll, cut into a predetermined belt width by a cutter, and finished into individual double V-ribbed belts.
[0049]
Subsequently, another manufacturing method is proposed in the present invention for the aforementioned double V-ribbed belt manufacturing process. In the above-described forming step 100, an unvulcanized laminate was formed based on three procedures. In this new manufacturing method, the upper rib forming step of the third procedure is performed under the first procedure. In the same manner as in the rib forming step, the cylindrical body is inserted, that is, the upper rib rubber 6 is made endless in advance and is inserted into the outer peripheral surface after the spiral winding of the core wire 4 is covered. . It is intended to prevent joint defects.
[0050]
Next, this will be described in detail with reference to FIG. The first and second steps of the molding step 100 are similarly completed, and the lower rib portion rubber 3 is covered on the mold M, and the core wire 4 is spirally wound on the upper surface thereof. The die supported on the shaft is raised, lifted by the lifting chain 34, and the upper rib rubber 6 made endless in a cylindrical shape is inserted below it, and the shaft core is set around the centering fitting 27, The lifted mold M is lowered again and supported and inserted manually.
[0051]
Therefore, the first step and the second step of the previous stage, the vulcanization step of cross-linking the unvulcanized laminate following the above to produce a vulcanized sleeve, and the rib crests and valleys on the front and back of the vulcanized sleeve The grinding step for polishing the surface is performed similarly in accordance with the above-described manufacturing method.
[0052]
Next, regarding the method of molding the rib rubbers 3 and 6 into a cylindrical shape, in the present invention, this cylindrical molding process is set as the preparation process P2, and is separated from the molding line formed in the molding process P1 and has an offline configuration. This offline will be described below with reference to FIG.
[0053]
In the conventional process, the rib rubber member is unwound from the wound sheet in the molding step 100 in the molding line, wound around the mold M and cut into a predetermined length, and uses an in-line method. In the present invention, an EPDM material that is inferior in adhesiveness is used, and as shown in FIG. 3, a production method in which it is taken off-line in parallel with the molding line and is supplied from outside the molding line in the preparation step P2. Used.
[0054]
In the above-described outer setup production system, the ribbed rubber members 3 and 6 are unwound from the wound sheet, cut into a predetermined length, rounded into a cylindrical shape, and the front and rear end portions thereof are butted and overlapped, and a preheated hot platen Press in between, preheat and press to joint and endless. This cylindrical body is thrown into the molding step 100 in a timely manner.
[0055]
In the above-described cutting method, as shown in FIG. 13B, a joint crimping method is used in which the sheet is cut obliquely in the longitudinal section of the sheet, that is, the front and rear end slopes where the cut surface becomes a slope are abutted and stacked. Yes.
[0056]
In this way, the sheet body cut to a predetermined length according to the product circumferential length is placed on a press device as shown in FIG. Are fixed on the lower heating plate by clamping, and the upper heating plate installed at the upper side is lowered and pressed to perform pressure bonding while preheating. One end of the lower heating plate is opened by taking out the endless cylindrical body by pressure bonding.
[0057]
Subsequently, the main body of the upper and lower rib rubbers 3, 6 used as described above is formed by laminating a plurality of single-ply sheets R as shown in FIG. The rolling of the EPDM material with poor adhesion will be described with reference to FIGS. In the completed belt, the added short fibers are lined up in the direction protruding from the side surface, and are formed into a thin sheet. In addition, five layers of adhesive rubber are laminated and integrated on the outer surface of one side in order to simplify the lamination molding. These EPDM handling methods will be described.
[0058]
First, as shown in FIGS. 2B, 8, 9, and 10, the following ply-up method is used for forming the upper and lower rib rubbers 3 and 6. The single-ply sheet R is thinned and the short fibers dispersed in the sheet are rubbed with each other at the peripheral speed difference on the roll surface and rolled to align the fibers in the sheet flow direction and to orient in a certain direction (FIG. 13). reference).
[0059]
FIG. 8 shows a process of sheeting the single ply sheet R with the calendar 91 and winding it around the holding sheet H. A top roll 92, a center roll 93, and a bottom roll 94 are provided, and the top roll 92 and the center roll 93 are set to a low temperature of 25 to 35 ° C. to prevent perforation and squeezing. A single-ply sheet R with oriented fibers is rolled and a holding sheet H is stacked and wound.
[0060]
Next, according to the present invention, as shown in FIG. 9, five layers of adhesive rubber are doubled by a calendar 91 on the above-described single-ply sheet R surface. The top roll 92 and the center roll 93 are heated to a high temperature of 60 to 80 ° C. to prevent perforation and rolling, and the sheet of the adhesive rubber 5 is kneaded and sheeted between the rolls of the single ply sheet R described above. It is rewound, inserted into a compression roll 95, and doubled to produce a laminate composed of one single-ply sheet R having five layers of adhesive rubber on one side.
[0061]
Subsequently, as shown in FIG. 10, the second and third single-ply sheets R are successively stacked on the laminated body to produce the rib rubbers 3 and 6. In this lamination process, a ply-up device 89 shown in FIG. 10 is used. The laminated surface of the single ply sheet R is preheated to 60 to 80 ° C. with a heater, and is pressure-bonded with a pair of pressing rolls 96.
[0062]
Next, a method for aligning these sheets with the finished belt so that the short fibers protrude on the side surface of the belt will be supplemented with reference to FIG. The short fibers dispersed in the rubber are oriented in the alignment direction of the short fibers indicated by the broken line in FIG. The orientation and the sheet thickness are related and are preset. The single ply sheet R coming out of the calendar 91 is oriented in the sheet flow direction.
[0063]
As shown in FIG. 13B, the upper and lower rib rubbers 3 and 6 in which a plurality of single-ply sheets R in which short fibers are oriented are overlapped by the above-described ply-up method and five adhesive rubber layers are laminated on one side surface. The bevel cut is performed in the same manner as described above, and the taper surface of the bevel cut end of the cut sheet cut into the mold forming width W2 is overlapped and pressure-bonded. Thereby, it is oriented perpendicularly to the longitudinal direction of the sheet, and this sheet is cut into a cylindrical body with a predetermined length according to the peripheral length of the mold or the inner circumferential length of the laminate, thereby forming the tubular body rubber 3 in the previous stage. , 6 sheets are prepared.
[0064]
Next, as described above, the end portion of which the cut surface cut obliquely with this cut sheet is a taper surface is transferred to a molding press described later, and both ends are overlapped and the butt joint portion is preheat-pressed to be endless. A cylindrical body is used.
[0065]
In this way, according to the product circumferential length, the sheet body cut to a predetermined length is placed on a press device described later, the sheet is wound around the lower heating plate, and the front and rear ends thereof are placed on the lower heating plate. The butt is clamped and fixed, and the upper heating plate installed at the top is lowered and pressed to perform pressure bonding while preheating. One end of the lower heating plate is released from the endless cylindrical body that has been crimped, and is taken out into the molding process.
[0066]
A molding apparatus that is disposed in the double V-ribbed belt manufacturing process shown in FIG. 3 and laminates an unvulcanized belt constituent member on its outer peripheral surface using a belt molding die, and rubber on the cylindrical laminated molded body A vulcanizing can unit that extrapolates a jacket made of the product and seals in a vulcanizing can integrally with the mold and maintains the crosslinking temperature while compressing and compressing, and a cooling unit that cools the crosslinked sleeve from the inner surface of the mold. A mold removal device that removes the sleeve integrally molded on the outer periphery of the mold and a mold release agent application device that performs the next molding on the cylindrical outer surface of the empty mold are arranged in a series of flow steps. Is an apparatus for manufacturing a belt vulcanization sleeve connected by a conveying device that sequentially carries in and out.
[0067]
Next, a molding press apparatus according to the present invention, which relates to the above-described belt molding apparatus 20 and molds the above-mentioned upper and lower rib rubbers in a cylindrical shape in advance, will be described in detail with reference to FIGS. First, FIG. 5 shows a schematic front view of the present apparatus. A lower heating plate 42 arranged at the center of the apparatus, an upper heating plate 43 that can be pressed from above, and rib rubbers 3, 6 are shown. A cradle 44 is wound around the lower heat platen 42, and the front end portions of the rib rubbers 3 and 6 are temporarily pressed on the upper surface of the lower heat platen 42, and the rear end portion wound up from the hand is further moved to the front end portion. It is comprised from the clamp part 45 which abuts and temporarily presses.
[0068]
First, the lower heating plate 42 has a configuration of a swing horizontal beam 62 and has a function of swinging upward in the drawing with the left end portion in FIG. 5 as a fulcrum (see FIG. 7), and can discharge the cylindrical body. On the upper surface, there is provided a hot platen 61 in which a heater is charged in a smooth flat plate and can be preheated.
[0069]
Subsequently, the upper heating plate 43 is a heating plate 61 in which a heater is provided in a smooth flat plate, and includes a guide rod 52 and a guide bush 53 that can move horizontally in the vertical direction, and is a press cylinder that serves as both driving and pressing force. 51 are arranged in the longitudinal direction so that they can be pressed evenly.
[0070]
The cradle 44 is shown in cross section in FIG. The sheet-cut soft rubber ribs 3 and 6 on the waist are wound around the lower heating plate 42 easily. In other words, in the present invention, as the guide means 46, the overhanging frame 63 projecting forward under the lower heating plate 42 is attached to the press main body 41, and the rolling elements 64 are arranged on the upper surface thereof and placed on the upper surface. The rib rubbers 3 and 6 are configured to slide easily. Further, when pushed further back, the front end portion is supported and installed on the semicircular notch plate 67 so that the rotating roller 65 bends upwards sequentially.
[0071]
Subsequently, the upper surface of the clamping means 45 according to the present invention is shown in detail in FIG. 7, and a side view thereof is shown in FIG. First, the front end pushing plate 71 is attached to the front end of the front end supporting arm 73, and the front end pushing plate 71 is pressed onto the lower heating plate 42 by extending and retracting the front end clamping cylinder 75 with the swaying fulcrum on the semicircular notch plate 67. It can be removed and clamped.
[0072]
Further, the rear end portion is butted against the clamped front end portion, and the other rear end clamp cylinder 76 is expanded and contracted to place the rear end push plate 72 at the front end of the rear end support arm 74 on the lower heating plate 42. The rear end can be clamped freely by pressing or removing. Thus, the rib rubbers 3 and 6 are attached to the lower heating plate 42. In An endless body having a joint portion is prepared by winding and providing a butted portion at the front and rear ends on the lower heating platen 42 and sandwiching it between the upper and lower heating plates 42 and 43.
[0073]
Below, operation | movement of the shaping press apparatus of this invention is demonstrated using FIGS. 1) The rib rubber is cut at a predetermined length (the sheet longitudinal direction cross section is oblique). 2) Transfer onto the cradle 44. 3) Send the front end onto the press board 61. 4) Fix the front end with the rear clamp 71 with the foot switch. 5) The rear end of the hand side is rounded back, and the insertion joint is brought into contact with the front end of the press panel along the guide roll. 6) Check for overlap of diagonal surfaces. 7) Fix the rear end with the hand side clamp 72 with the foot switch. 8) Lower the upper heating plate with the push button. 9) After pressing for a predetermined time, the upper heating plate rises and both clamps 71 and 72 are released. 10) Release the lower heating platen lock handle, swing and take out the rib rubber jointed in a cylindrical shape.
[0074]
The embodiment is not limited to the above, and may be modified as follows, for example. (1) The example of orienting the short fibers in the upper and lower rib rubbers is not limited to the above-mentioned heater preheating pressure bonding, and there is also the following method of heating and plying up using a calendar. That is, a single ply sheet is rolled between the top roll and the center roll, doubling is performed between the center roll and the bottom roll, and a compression roll is attached to the bottom roll to compress and ply up. (2) Further, a method of providing an expandable die in an extruder and orienting with an expanded flow is also limited.
[0075]
【Effect of the invention】
In the invention relating to the manufacturing method of the double V-ribbed belt according to claim 1, the lower rib rubber made of EPDM material having poor adhesion is forcibly fixed on the outer surface of the iron mold using an auxiliary tape, Therefore, it is possible to mold the rubber of the lower rib part of the joint without performing unstable joint work. Further, a core wire is spirally wound on the outer peripheral surface of the lower rib rubber, and the adhesive rubber layer is looked into. In the third molding step, which is easier to bond than the outer surface of the iron mold, the adhesive rubber layer is laminated on the inner surface side. The upper rib part rubber can be laminated by suitably winding a preheating pressure bonding machine in the conventional method.
[0076]
In the invention relating to the manufacturing method of the double V-ribbed belt according to claim 2, the upper rib rubber can be formed in advance in a cylindrical shape, so that the joint can be reliably formed with less work variation. There is an advantage that the auxiliary tape for temporary fixing can be minimized.
[0077]
In the invention relating to the method for producing a double V-ribbed belt according to claims 3 and 4, in the existing molding step, molding is performed using a rubber body that is easy to adhere on the mold surface, and the step of forming a cylinder is performed. By expanding outside the existing line and introducing it in a timely manner, the current organic can be utilized, cycle up can be minimized, and conventional products can be co-produced.
[0078]
In the invention relating to the manufacturing method of the double V-ribbed belt according to claim 5, the number of times of lamination on the mold can be reduced by half, and the work of preheating and pressing each sheet layer having poor adhesion can be minimized and uniform. Lamination can be done by thickness.
[0079]
In the invention relating to the method of manufacturing the double V-ribbed belt according to claim 6, the cylindrical body which is relatively heavy and tends to be deformed can be supported in a stable posture, close to the molding operator, and easy to perform an auxiliary work touch. . In addition, it is possible to cope with minor modifications of existing molding equipment without making new investment, and conventional products can be produced at the same time.
[0080]
In the invention relating to the molding press apparatus according to the seventh aspect, the sheet-like upper and lower rib rubber cut into a predetermined length can be placed on the receiving table and processed into a cylinder by one person. In addition, it can be easily prepared as needed, and it is convenient for temporary storage.
[0081]
In the invention related to the molding press apparatus according to claim 8, the front end of the upper and lower rib rubber is rotated to wind the lower heating plate, and the front end looks into the hand side to easily fine-adjust the butt overlap state. A rubber sheet that tends to deform Setting I can do it.
[0082]
In the invention relating to the molding press apparatus according to the ninth aspect, the front end portion is first fixed in the order of operation to form a cylinder, and then the rear end portion can be fixed after folding back and abutting the rear end portion. Therefore, one person can work and fine adjustments can be made. At the same time, with the butt maintained, the upper heating plate lowers and presses, so there is no position error and joints can be made.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional perspective view of a double V-ribbed belt.
2A is a partial cross-sectional view of an unvulcanized state molded on a mold, and FIG. 2B is a partial cross-sectional view showing a laminated state of upper and lower rib rubbers.
FIG. 3 is a manufacturing process diagram of a double V-ribbed belt showing off-line and in-line according to the present invention.
FIG. 4 is a schematic front view of a belt forming machine showing loading of a mold and injection of a rib-shaped rubber cylindrical body according to the present invention.
FIG. 5 is an overall front view of the molding press apparatus of the present invention.
6 is a side view of an essential part showing guide means for rounding into a cylindrical shape in FIG. 5 according to the present invention.
7 is a top view of the forming press apparatus of FIG. 5 showing a swing mechanism and a clamp mechanism of the lower heating plate of the present invention. FIG.
FIG. 8 is a calendar diagram for sheeting a single ply sheet that is a base material for upper and lower rib portions.
FIG. 9 is a calendar diagram for doubling adhesive rubber on the single-ply sheet of FIG. 8;
10 is a schematic front view of a ply-up device that plies a single-ply sheet onto the doubling sheet of FIG. 8. FIG.
FIG. 11 is a cross-sectional view of an essential part for positioning a vulcanization sleeve and grinding V-rib grooves on upper and lower surfaces.
FIG. 12 is a schematic front view of a grinding machine.
FIGS. 13A and 13B show the process of creating the orientation of short fibers in the upper and lower rib rubbers. FIG. 13A is an orientation state diagram during calendering. FIG.
It is a state figure which changes direction to direction.
[Explanation of symbols]
M Mold
R single ply sheet
1 Double V-ribbed belt
3 Lower rib rubber
4 core wires
5 Adhesive rubber
6 Upper rib rubber
7 rib mountain
8 Rib Valley
20 Belt forming machine
26 Swing frame
27 Centering bracket
34 Lifting chain
40 Forming press equipment
45 Clamping means
46 Guide means
80 Sleeve polishing machine
89 Ply-up device
91 Calendar
96 A pair of pressure rolls

Claims (9)

At least a reinforcing cloth is not arranged on the belt, and there are a plurality of rib portions extending in the longitudinal direction of the belt on both upper and lower surfaces of the adhesive rubber layer in which the core wire is embedded, and an ethylene-α-olefin elastomer is used as the adhesive rubber layer. In the manufacturing method of a double V ribbed belt using ethylene-α-olefin elastomer on the upper and lower ribs provided on both sides of the adhesive rubber layer, the lower rib rubber is formed in a cylindrical shape in advance. Then, a first molding step to be inserted into the cylindrical mold, a second molding step in which a core wire which is a tensile body is spirally wound on the outer peripheral surface, and further on the outer peripheral surface of the wound body A third molding step in which the upper rib rubber is wound to make it endless, and a molded body obtained by sequentially laminating the lower rib rubber, the core wire, and the upper rib rubber on the cylindrical mold is added. Vulcanizers that vulcanize to produce vulcanized sleeves And a grinding process of grinding the both surfaces of the vulcanization sleeve to create upper and lower rib portions. At least a reinforcing cloth is not arranged on the belt, and there are a plurality of rib portions extending in the longitudinal direction of the belt on both upper and lower surfaces of the adhesive rubber layer in which the core wire is embedded, and an ethylene-α-olefin elastomer is used as the adhesive rubber layer. In the manufacturing method of a double V ribbed belt using ethylene-α-olefin elastomer on the upper and lower ribs provided on both sides of the adhesive rubber layer, the lower rib rubber is formed in a cylindrical shape in advance. Then, a first molding step to be inserted into the cylindrical mold, a second molding step in which a core wire which is a tensile body is spirally wound on the outer peripheral surface, and further on the outer peripheral surface of the wound body A third molding step in which an upper rib rubber formed in a cylindrical shape is inserted, and molding obtained by sequentially laminating the lower rib rubber, the core wire, and the upper rib rubber on the cylindrical mold. Vulcanize body to create vulcanization sleeve A method for manufacturing a double V-ribbed belt, comprising: a vulcanizing step for grinding; and a grinding step for grinding upper and lower rib portions by grinding both surfaces of a vulcanizing sleeve. The step of forming the lower rib rubber in the first molding step into a cylindrical shape is a molding in which the first molding step, the second molding step, the third molding step, and the vulcanization step are lined up. The method for manufacturing a double V-ribbed belt according to claim 1, wherein the external setup is performed as an offline line. The steps of forming the lower rib rubber of the first molding step and the upper rib rubber of the third molding step into a cylindrical shape in advance are the first molding step, the second molding step, and the third molding step. The method for producing a double V-ribbed belt according to claim 2, wherein an external setup is performed as an off-line of a molding line in which the vulcanization step is lined. 5. The double V-ribbed belt according to claim 1, wherein the lower rib rubber and the upper rib rubber use a laminate in which an adhesive rubber layer is previously laminated on a rib rubber layer containing short fibers. Manufacturing method. The first molding step of inserting and inserting into the cylindrical mold is to insert a cylindrical mold having a cylindrical lower rib portion standing vertically and having a vertical axis along the axis line from above. Or the manufacturing method of the double V ribbed belt of 2. In a molding press apparatus in which a rubber sheet of a predetermined length using an ethylene-α-olefin elastomer is rolled and both ends are joined to form a cylindrical body , a pressable upper heating plate and one end are opened and joined together A lower heating plate from which the cylindrical body can be taken out; a cradle for winding the rubber sheet around the lower heating plate; and a front end portion of the rubber sheet on the side wound by the cradle on the upper surface of the lower heating plate; And a clamping means for fixing the abutting portion with the rear end portion on the opposite side . 8. The molding press apparatus according to claim 7, wherein the cradle for winding the rubber sheet around the lower heating plate includes guide means whose front end is bent in a loop shape when the rubber sheet is pushed forward . Clamping means for fixing the butt portion, the pressing freely over the heating platen was positioned centrally between front and rear ends of the rubber sheet in the vicinity before and after the individual holding operation can claim 7 or 8 The molding press apparatus described in 1 .

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