JP2013002256A - Method of manufacturing foamed rubber track pad - Google Patents
Method of manufacturing foamed rubber track pad Download PDFInfo
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- JP2013002256A JP2013002256A JP2011138029A JP2011138029A JP2013002256A JP 2013002256 A JP2013002256 A JP 2013002256A JP 2011138029 A JP2011138029 A JP 2011138029A JP 2011138029 A JP2011138029 A JP 2011138029A JP 2013002256 A JP2013002256 A JP 2013002256A
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 100
- 239000005060 rubber Substances 0.000 title claims abstract description 100
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 21
- 238000000465 moulding Methods 0.000 claims abstract description 17
- 150000001875 compounds Chemical class 0.000 claims abstract description 16
- 239000004088 foaming agent Substances 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 239000004744 fabric Substances 0.000 claims description 76
- 229920001875 Ebonite Polymers 0.000 claims description 34
- 238000010438 heat treatment Methods 0.000 claims description 22
- 238000004073 vulcanization Methods 0.000 claims description 17
- 238000005187 foaming Methods 0.000 claims description 13
- 238000000137 annealing Methods 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 244000043261 Hevea brasiliensis Species 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 239000006260 foam Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229920003052 natural elastomer Polymers 0.000 claims description 4
- 229920001194 natural rubber Polymers 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 229920003051 synthetic elastomer Polymers 0.000 claims description 4
- 239000005061 synthetic rubber Substances 0.000 claims description 4
- 238000000354 decomposition reaction Methods 0.000 claims description 2
- 238000010030 laminating Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 3
- 230000000704 physical effect Effects 0.000 abstract 1
- 239000011800 void material Substances 0.000 abstract 1
- 239000000047 product Substances 0.000 description 7
- 239000010410 layer Substances 0.000 description 6
- 241001669679 Eleotris Species 0.000 description 5
- 229920001821 foam rubber Polymers 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000012856 packing Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000010097 foam moulding Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
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Abstract
Description
本発明は、鉄道のまくらぎとレールの間、まくらぎ上に固定されるタイプレートとレールとの間、又は、タイプレートやまくらぎの下などに設定される発泡ゴム製軌道パッドの製造方法に関する。 The present invention relates to a method of manufacturing a foam rubber track pad set between a railway sleeper and a rail, between a tie plate fixed on the sleeper and a rail, or under a tie plate or a sleeper. .
軌道パッドは主に緩衝を目的として使用されるゴム製の矩形状又は平板状のパッドである。近年鉄道の高速化に伴い大きな振動及び騒音が発生しやすくなってきており、これを解消するために軌道パッドのばね定数をなるべく小さくすることが必要とされている。 The track pad is a rubber rectangular or flat pad mainly used for cushioning. In recent years, with the speeding up of railways, large vibrations and noises are likely to occur, and in order to eliminate this, it is necessary to make the spring constant of the track pad as small as possible.
従来は、天然ゴム又は合成ゴムのパッドに溝等の凹みをつけ、この凹みの大きさ及び数を調整することによりばね定数を調整してきたが、この凹みのために機械的強度、耐久性が低下するために、バネ定数を低くすることには限界があるとされてきた。 Conventionally, natural rubber or synthetic rubber pads have been provided with recesses such as grooves, and the spring constant has been adjusted by adjusting the size and number of these recesses, but this recess has mechanical strength and durability. In order to reduce, it has been considered that there is a limit to lowering the spring constant.
これに対して、発泡ゴムを使用することによりバネ定数を低くすることが提案なされている（例えば、特許文献１参照）。この発泡ゴムを用いた軌道パッドは、レール継目に用いられるもので、レール継目に敷かれるパッドを車両入り側と車両出側とに分け、車両出側の軌道パッドに発泡ゴムを用いてそのばね定数を車両入り側の軌道パッドより低く設定することにより一定の低振動／低騒音効果を奏し、かつバラストの沈下量を低減する効果があるとされる。 On the other hand, it has been proposed to lower the spring constant by using foamed rubber (see, for example, Patent Document 1). The track pad using the foam rubber is used for the rail joint, and the pad laid on the rail joint is divided into the vehicle entrance side and the vehicle exit side, and the foam pad is used for the track pad on the vehicle exit side and its spring. By setting the constant lower than the track pad on the vehicle entrance side, it is said that there is an effect of achieving a certain low vibration / low noise effect and reducing the amount of ballast settlement.
しかし、発泡ゴムによる軌道パッドの製造には、次のような問題があることが分かった。（１）金型の平板状の成形空所に発泡剤を混ぜたゴム材を入れて加熱加圧して軌道パッドを作ろうとすると、成形空所の縁の部分では、金型の上下面と縁側面の三方から加熱されるのに対して、成形空所の縁から離れた部分では金型の上下面からの加熱だけとなるので、この縁から離れた部分よりも縁に近い部分では、発泡よりも加硫が速く進みやすく、このために成形された製品の縁の部分の肉厚が薄くなるために、金型から取り出したゴム材は、その肉厚が薄くなった周縁部分を切り落とさねばならず材料のロスが非常に大きくなりコスト高となる。（２）また、上述のようにして軌道パッドを製造すると、表面の凸凹、キズ等の外観不良が生じやすく、また、材料への気泡の混入による製品の膨らみなどが生じやすい。（３）発泡成形終了後に、製品の縮み、変形を防止するために恒温槽に入れてアニーリングを行うがアニーリング後も数ヶ月の間縮み続けて製品の寸法が小さくなる場合がある。 However, it has been found that there are the following problems in the production of the raceway pad made of foamed rubber. (1) When a rubber pad mixed with a foaming agent is put into a flat plate-shaped molding cavity of a mold and heated and pressed to make a track pad, the upper and lower surfaces of the mold and the edge side are formed at the edge of the molding cavity. Heating from three sides of the surface, but only heating from the upper and lower surfaces of the mold in the part away from the edge of the molding cavity, foaming in the part closer to the edge than the part away from this edge Since the vulcanization is faster and easier, and the thickness of the edge of the molded product is reduced, the rubber material taken out of the mold must be cut off at the peripheral edge where the thickness is reduced. In other words, material loss becomes very large and the cost is high. (2) Further, when the track pad is manufactured as described above, appearance defects such as irregularities on the surface and scratches are likely to occur, and the product is likely to bulge due to mixing of bubbles in the material. (3) After foaming is completed, annealing is performed in a thermostatic bath in order to prevent shrinkage and deformation of the product. However, shrinkage may continue for several months after annealing, and the size of the product may be reduced.
本発明は、このような問題を解消する発泡ゴム製軌道パッドの製造方法を提供することを目的としている。 The object of the present invention is to provide a method of manufacturing a foamed rubber track pad that solves such problems.
すなわち、本発明は、
発泡剤及び加硫剤を含むゴムコンパウンドを用意するステップと；
該ゴムコンパウンドを圧延してシート状のゴム生地とするステップと、
シート状のゴム生地を複数枚の矩形状のゴム生地に切り出すステップと、
矩形状ゴム生地を複数枚重ねて圧着して平板状のゴム生地とするステップと、
平板状のゴム生地を、第１金型の平板状の第１成形空所に加圧充填した状態に設定するステップと；
第１金型を加熱してゴム生地での発泡及び加硫を行うステップと、
第１金型からゴム生地を取り出すステップと、
第１金型から取り出したゴム生地を第２金型の成形空所に設定して加熱して発泡及び加硫を進めるステップと、
第２金型からゴム生地を取り出すステップと
を有する発泡ゴム製軌道パッドの製造方法を提供する。
That is, the present invention
Providing a rubber compound comprising a foaming agent and a vulcanizing agent;
Rolling the rubber compound into a sheet-like rubber fabric;
Cutting the sheet-like rubber fabric into a plurality of rectangular rubber fabrics;
A step of laminating a plurality of rectangular rubber fabrics and pressing them into a flat rubber fabric,
Setting the flat rubber fabric in a state of being pressure-filled into the flat first molding cavity of the first mold;
Heating the first mold to foam and vulcanize the rubber fabric;
Removing the rubber fabric from the first mold;
Setting the rubber fabric taken out from the first mold in the molding cavity of the second mold and heating to advance foaming and vulcanization;
There is provided a method of manufacturing a foamed rubber track pad having a step of removing a rubber fabric from a second mold.
この方法では、金型に入れるゴム生地を上述のように圧延によりシート状にしたものを、矩形状ゴム生地とし、これを数枚重ねて平板状にするようにしているために、ゴム生地へのエアの混入や、ゴム生地表面の凹凸やキズを最小限にすることができる。このため、第２金型から取り出されるゴム板は、表面の凹凸やキズが少なく、また、内部に含まれるエアも最小限にすることができ、エアによる膨らみなども無いものとすることができ、従って、このゴム板を使った良質の発泡ゴム製軌道パッドの製造を可能とする。 In this method, the rubber dough to be put into the mold is made into a sheet shape by rolling as described above into a rectangular rubber fabric, and this is laminated into a flat plate shape. It is possible to minimize the mixing of air and unevenness and scratches on the rubber fabric surface. For this reason, the rubber plate taken out from the second mold has few surface irregularities and scratches, can also minimize the air contained therein, and can be free from bulging by air. Therefore, it is possible to manufacture a high-quality foam rubber track pad using the rubber plate.
更に、本発明に係る製造方法では、第２金型の成形空所に設定されるゴム生地の容量が、該第２金型の成形空所の容量の９０％以上となるようにすることを特徴とする。このようにすることにより、第２金型におけるゴム生地の膨張を少なくすることができる。本発明に係る製造方法で作られた軌道パッドは、製品化後の縮みが極めて少ないことが確認されているが、これは上記特徴によるものと考えられる。 Furthermore, in the manufacturing method according to the present invention, the volume of the rubber cloth set in the molding cavity of the second mold is set to be 90% or more of the capacity of the molding cavity of the second mold. Features. By doing in this way, expansion | swelling of the rubber cloth in a 2nd metal mold | die can be decreased. It has been confirmed that the track pad made by the manufacturing method according to the present invention has very little shrinkage after commercialization, which is considered to be due to the above-mentioned characteristics.
また、本発明では、第１金型を加熱する前記ステップにおける加熱温度を、ゴム生地の前記発泡剤の分解による発泡を進め且つ同ゴム生地の前記加硫剤による加硫を抑制する温度とすることができる。すなわち、第１金型においては、加硫よりも、発泡を促進することにより、ゴム生地全体が均一に発泡するようにするものであり、これにより、前述した、ゴム生地周縁部分での肉厚が他の部分に較べて薄くなることを防ぐことが可能となる。 Moreover, in this invention, the heating temperature in the said step which heats a 1st metal mold | die is made into the temperature which advances foaming by decomposition | disassembly of the said foaming agent of rubber cloth, and suppresses the vulcanization | cure by the said vulcanizing agent of the rubber cloth. be able to. That is, in the first mold, by promoting foaming rather than vulcanization, the entire rubber cloth is made to foam uniformly. Can be prevented from becoming thinner than other portions.
また、本発明では、上記の如き第１金型の加熱による処理に続き、第２金型の加熱により、ゴム生地の発泡及び加硫が略完了するようにすることができる。このようにすることにより、ゴム生地全体が均一に発泡した状態で加硫が行われ、全体が均質な発泡ゴムとすることが可能となる。 Further, in the present invention, foaming and vulcanization of the rubber cloth can be substantially completed by heating the second mold following the treatment by heating the first mold as described above. By doing so, vulcanization is performed in a state where the entire rubber fabric is uniformly foamed, and it becomes possible to obtain a foam rubber that is homogeneous throughout.
具体的には、第２金型の加熱温度を、第１金型の加熱温度よりも高くする。 Specifically, the heating temperature of the second mold is set higher than the heating temperature of the first mold.
本発明では更に、第２金型から取り出した平板状のゴム材を一定温度でアニーリングするステップを更に有するようにすることができる。このようにすることにより、ゴム板内で略完了していた発泡及び加硫を最終的に完了させ、当該ゴム材の状態を安定したものとすることができる。 The present invention can further include a step of annealing the flat rubber material taken out from the second mold at a constant temperature. By doing in this way, foaming and vulcanization which have been almost completed in the rubber plate can be finally completed, and the state of the rubber material can be stabilized.
本発明の別の態様では、上述の板状のゴム生地を作るのに、次のようなステップを更に有するようにすることができる。すなわち、
天然ゴム又は合成ゴムを主成分とし、ナイロンキャンバス、硫黄、カーボン、加硫剤等を含み、加硫完了時に超硬質ゴムとなる超硬質ゴムコンパウンドを用意するステップと、
該超硬質ゴムコンパウンドを圧延してシート状の超硬質ゴム生地とするステップと、
該シート状の超硬質ゴム生地を、前記矩形状のゴム生地と同じ縦及び横のサイズを有する矩形状の超硬質ゴム生地に切り出すステップと、
該矩形状の超硬質ゴム生地を、前記矩形状に切り出された複数のゴム生地と共に重ねて圧着して平板状のゴム生地とし、該超硬質ゴム生地が当該平板状のゴム生地の最上部層となるようにするステップと、
を有する。この該超硬質ゴム生地を有する該平板状のゴム生地を前記第１金型及び前記第２金型にて加熱処理するようにして所要の軌道パッドの製造を行う。
In another aspect of the present invention, the following steps may be further included in producing the plate-shaped rubber fabric. That is,
A step of preparing an ultra-hard rubber compound containing natural rubber or synthetic rubber as a main component, including nylon canvas, sulfur, carbon, a vulcanizing agent, and the like and becoming an ultra-hard rubber when vulcanization is completed;
Rolling the ultra-hard rubber compound into a sheet-like ultra-hard rubber fabric;
Cutting the sheet-like super-hard rubber fabric into a rectangular super-hard rubber fabric having the same vertical and horizontal sizes as the rectangular rubber fabric;
The rectangular super-hard rubber fabric is overlapped with the plurality of rubber fabrics cut into the rectangular shape and pressed to form a flat rubber fabric, and the super-hard rubber fabric is the uppermost layer of the flat rubber fabric. Steps to become
Have The flat rubber cloth having the ultra-hard rubber cloth is heat-treated with the first mold and the second mold to produce a required track pad.
以下、本発明に係る方法によって、高さ×縦×横が１２×３００×３８０ｍｍの平板状発泡ゴム材を製造する具体例について説明する。 Hereinafter, a specific example of producing a flat foamed rubber material having a height × length × width of 12 × 300 × 380 mm by the method according to the present invention will be described.
先ず、ＥＰＤＭ系ポリマーを主成分とし、カーボン、加硫剤、加硫促進剤、発泡剤、発泡促進剤、その他を適度に添加したしゴムコンパウンドを用意する。 First, a rubber compound is prepared by adding an EPDM polymer as a main component and appropriately adding carbon, a vulcanizing agent, a vulcanization accelerator, a foaming agent, a foaming accelerator, and the like.
このゴムコンパウンドは、先ず、回転する２本のロールの一方に巻きつかせ、１ｍｍ〜３ｍｍの厚さのシート状になるまで圧延して、表面のキズや混入されていたエアを最小限する。その後、ロールから外したシート状の生地を矩形状に切り出し、矩形状にされた生地を４−６枚重ね合わせて一対の圧着ローラ間を通すことにより圧着し、第１金型の成形空所より僅かに大きい容量の平板状の生地を作る。このような作業により、エア混入、表面のキズ、シワを最小限にした生地を用意することができる。 This rubber compound is first wound around one of the two rotating rolls and rolled until it becomes a sheet having a thickness of 1 mm to 3 mm to minimize surface scratches and mixed air. Thereafter, the sheet-like material removed from the roll is cut out into a rectangular shape, and 4-6 sheets of the rectangular material are overlapped and pressed between a pair of pressure-bonding rollers to form a molding cavity for the first mold. Make a flat dough with a slightly larger capacity. By such an operation, it is possible to prepare a cloth that minimizes air contamination, surface scratches, and wrinkles.
金型は、それぞれ、上型と下型からなる第１段金型及び第２段金型を用意する。第１段金型及び第２段金型は、それぞれ、１０×２６５×３３５ｍｍ及び１２．５×３００×３８０ｍｍの平板状の成形空所を有するものとする。 As the molds, a first stage mold and a second stage mold each comprising an upper mold and a lower mold are prepared. The first-stage mold and the second-stage mold have plate-shaped forming cavities of 10 × 265 × 335 mm and 12.5 × 300 × 380 mm, respectively.
上記のようにして用意した平板状のゴム生地を第１金型に、その成形空所を充填するように設定して加圧し、約１２０〜１８０℃（本具体例では１６０℃）において約５〜２０分（本具体例では約１０分）加熱する。この加熱温度及び時間は、発泡剤による発泡を促進するとともに、加硫は十分には進まないようにするものである。 The flat rubber dough prepared as described above is set in the first die so as to fill the molding space and pressurized, and about 5 at about 120 to 180 ° C. (160 ° C. in this specific example). Heat for ~ 20 minutes (about 10 minutes in this example). This heating temperature and time promote foaming by the foaming agent and prevent vulcanization from proceeding sufficiently.
第１金型から取り出したゴム生地は、これを第２金型の成形空所内に設定する。ここで重要なことは、第１金型から取り出したゴム生地が、第１金型による加圧状態から解放されることにより膨張し、第２金型内に設定するときの該ゴム生地の容量が、第２金型の成型空所の容量の少なくとも９０％以上となるようにすることである。上述した第１金型の成型空所の容積、加熱温度及び時間は、このような点を考慮して決定されるものである。 The rubber fabric taken out from the first mold is set in the molding cavity of the second mold. What is important here is that the capacity of the rubber fabric when the rubber fabric taken out from the first mold is expanded by being released from the pressurized state by the first mold and set in the second mold. Is at least 90% of the capacity of the molding cavity of the second mold. The volume, heating temperature, and time of the molding cavity of the first mold described above are determined in consideration of such points.
第２金型に入れられたゴム生地は、約１５０℃〜２３０℃（本具体例では１８０℃）で約５〜２０分（本具体例では約１０分）加熱する。この加熱温度及び時間は、発泡を実質的に完了させると共に、加硫をも実質的に完了させるためのものである。 The rubber dough placed in the second mold is heated at about 150 ° C. to 230 ° C. (180 ° C. in this example) for about 5 to 20 minutes (about 10 minutes in this example). This heating temperature and time are for substantially completing the foaming as well as the vulcanization.
第２金型から取り出した材料は、約７０℃に保たれた恒温室にて約２４時間放置し、アニーリングを行う。アニーリングは、発泡成形終了後に、製品の縮み、変形を防止するために行う。アニーリングが終了して室温まで冷却した時点で厚みがほぼ１２．０ｍｍ〜１２．６ｍｍの厚さとなり、その後は製品の縮みが殆ど無いことが確認された。 The material taken out from the second mold is left to stand for about 24 hours in a temperature-controlled room maintained at about 70 ° C. for annealing. Annealing is performed to prevent shrinkage and deformation of the product after completion of foam molding. When the annealing was completed and the system was cooled to room temperature, the thickness became approximately 12.0 mm to 12.6 mm, and thereafter it was confirmed that there was almost no shrinkage of the product.
以上のようにして製造した平板状のゴム板は、その全体にわたり発泡が十分に行われているために、前述した周縁部分での厚さの減少は殆ど無く、また、表面の凹凸やキズ、膨らみなどが殆ど無い。従って、これを最終製品としての軌道パッドとすることも、またこの矩形状のゴム板から所要寸法の軌道パッドを切り出すこともできる。たとえ該平板状のゴム板の周縁部分の厚さが減少したとしても僅かであり、そのような減少が生じた場合には、必要に応じてその厚さが減少した僅かな部分を切り落とし、その後、必要サイズの軌道パッドを切り出せばよい。 Since the flat rubber plate produced as described above is sufficiently foamed throughout, there is almost no decrease in the thickness at the peripheral portion described above, and surface irregularities and scratches, There is almost no swelling. Therefore, this can be used as a track pad as a final product, or a track pad having a required dimension can be cut out from the rectangular rubber plate. Even if the thickness of the peripheral portion of the flat rubber plate is reduced, it is slight. When such a reduction occurs, a small portion of the reduced thickness is cut off as necessary, and thereafter Cut out the orbit pad of the required size.
本発明に係る製造方法の第２の実施形態としては、本願出願人の特許出願（特願２００５‐８１３８９号：特開２００６−２６５８４１号）で開示した超硬質ゴムを表層材として有する軌道パッドに応用したものがある。すなわち、この出願に係る軌道パッドは、加硫完了時に硬度がA98Hｓ以上とされた超硬質ゴムの層を当該軌道パッドの表層材とし、従来、耐摩耗性等を向上させるために鋼板製プレートを表面に取り付けていた鋼板製プレート付き軌道パッドに代わるものとして開発されたものであり、鋼板製プレートが軌道パッドから剥がれて飛散するなどの事故を防止することができるとして評価されているものである。本発明に係る第２の実施形態では、この超硬質ゴムの層を上述した発泡ゴム製軌道パッドの表層材として一体成形するものである。上述の第１の実施形態においては、発泡剤を含むゴムコンパウンドをシート状とし、これから切り出した矩形状ゴム生地を重ねて圧着し板状のゴム生地とし、これを第１及び第２金型にて加熱処理するようにしたが、第２実施形態においては、この板状のゴム生地を加圧及び加熱処理をする。 As a second embodiment of the manufacturing method according to the present invention, a track pad having super hard rubber as a surface material disclosed in the patent application of the present applicant (Japanese Patent Application No. 2005-81389: Japanese Patent Application Laid-Open No. 2006-265841) is used. There is something applied. That is, the track pad according to this application uses a super hard rubber layer having a hardness of A98Hs or higher when vulcanization is completed as a surface layer material of the track pad. Conventionally, a steel plate is used to improve wear resistance and the like. It was developed as an alternative to the track pad with a steel plate attached to the surface, and is evaluated as being able to prevent accidents such as the steel plate being peeled off and scattered from the track pad. . In the second embodiment according to the present invention, this super hard rubber layer is integrally formed as a surface layer material of the above-mentioned foamed rubber track pad. In the first embodiment described above, the rubber compound containing the foaming agent is formed into a sheet shape, and a rectangular rubber fabric cut out from the rubber compound is stacked and pressure-bonded to form a plate-shaped rubber fabric, which is used as the first and second molds. However, in the second embodiment, the plate-like rubber fabric is subjected to pressure and heat treatment.
具体的には、天然ゴム又は合成ゴムを主成分とし、ナイロンキャンバス、硫黄、カーボン、加硫剤等を含み、加硫完了時に超硬質ゴムとなる超硬質ゴムコンパウンドを用意するステップと、該超硬質ゴムコンパウンドを圧延してシート状の超硬質ゴム生地とするステップと、該シート状の超硬質ゴム生地を、前記矩形状のゴム生地と同じ縦及び横のサイズを有する矩形状の超硬質ゴム生地に切り出すステップと、該矩形状の超硬質ゴム生地を、前記矩形状に切り出された複数のゴム生地と共に重ねて圧着して平板状のゴム生地とし、該超硬質ゴム生地が当該平板状のゴム生地の最上部層となるようにするステップと、を有し、該超硬質ゴム生地を有する該平板状のゴム生地を前記第１金型及び前記第２金型にて加圧及び加熱処理をするようにする。超硬質ゴムの矩形状生地は一枚若しくは数枚とすることができる。超硬質ゴムとしては、具体的には、（木製まくらぎへのレールの食込み防止パッド用に規定されていた）ＪＩＳ−Ｅ１１１２による第１種軌道パッド（硬質ゴム）よりも高度が高い（好ましくはＡ９８Ｈｓ以上）ものとされ、例えば新日本エスライト工業株式会社で開発され、同社製品の鉄道用調整パッキン（レール面のレベル調整のためにレールとまくらぎとの間、レールとタイプレートとの間に挿入設定されるパッキン）の材料などとして使用されている商品名ＥＢ材（超硬質）ゴム（Ａ１００Ｈｓ）を使用することが好ましい。 Specifically, a step of preparing a super hard rubber compound containing natural rubber or synthetic rubber as a main component, including nylon canvas, sulfur, carbon, a vulcanizing agent, and the like and becoming a super hard rubber when vulcanization is completed; Rolling a hard rubber compound into a sheet-like super-hard rubber fabric; and forming the sheet-like super-hard rubber fabric into a rectangular super-hard rubber having the same vertical and horizontal sizes as the rectangular rubber fabric. A step of cutting into a dough, and superposing the rectangular superhard rubber fabric together with the plurality of rubber fabrics cut into the rectangular shape to form a flat rubber fabric, the superhard rubber fabric being a flat rubber fabric And a step of pressing and heating the flat rubber fabric having the super-hard rubber fabric with the first mold and the second mold. Like That. The rectangular fabric of super hard rubber can be one sheet or several sheets. Specifically, the super hard rubber has a higher altitude (preferably than the first type orbit pad (hard rubber) according to JIS-E1112 (defined for the anti-corrosion pad of the rail to the wooden sleeper)) A98Hs or more), for example, developed by Shin Nippon Eslite Kogyo Co., Ltd., the company's product rail packing packing (between rail and sleeper, rail and tie plate for level adjustment of the rail surface) It is preferable to use a trade name EB material (ultra-hard) rubber (A100Hs) used as a material of the packing set to be inserted into.
このようにして用意された超硬質ゴム生地を最上層に備える板状のゴム生地を第１及び第２金型により、上述と同様にして加圧及び加熱処理することにより、超硬質ゴムの最上層を備えた発泡ゴム製軌道パッドを製造することができる。この超硬質ゴム付きの発泡ゴム製軌道パッドは、発泡ゴムにより、従来の軌道パッドでバネ定数を小さくするために必要とされていた凹部を設けずに、所要の小さなバネ定数で柔軟な軌道パッドとすることができるとともに、その表面に超硬質ゴムからなる低摩擦係数で高い機械的強度を備え、従来の鋼板に代わる層を有する軌道パッドとすることができる。 By applying pressure and heat treatment to the plate-like rubber fabric provided with the superhard rubber fabric prepared in this way as the uppermost layer by the first and second molds in the same manner as described above, A foam rubber track pad having an upper layer can be manufactured. This foamed rubber track pad with super hard rubber is a flexible track pad with the required small spring constant without using the concave part required for reducing the spring constant with conventional rubber pads. In addition, a track pad having a low friction coefficient and high mechanical strength made of super-hard rubber on its surface and having a layer in place of a conventional steel plate can be obtained.
Claims (7)
該ゴムコンパウンドを圧延してシート状のゴム生地とするステップと、
シート状のゴム生地を複数枚の矩形状のゴム生地に切り出すステップと、
矩形状ゴム生地を複数枚重ねて圧着して平板状のゴム生地とするステップと、
平板状のゴム生地を、第１金型の平板状の第１成形空所に加圧充填した状態に設定するステップと；
第１金型を加熱してゴム生地での発泡及び加硫を行うステップと、
第１金型からゴム生地を取り出すステップと、
第１金型から取り出したゴム生地を第２金型の成形空所に設定して加熱して発泡及び加硫を進めるステップと、
第２金型からゴム生地を取り出すステップと
を有する発泡ゴム製軌道パッドの製造方法。 Providing a rubber compound comprising a foaming agent and a vulcanizing agent;
Rolling the rubber compound into a sheet-like rubber fabric;
Cutting the sheet-like rubber fabric into a plurality of rectangular rubber fabrics;
A step of laminating a plurality of rectangular rubber fabrics and pressing them into a flat rubber fabric,
Setting the flat rubber fabric in a state of being pressure-filled into the flat first molding cavity of the first mold;
Heating the first mold to foam and vulcanize the rubber fabric;
Removing the rubber fabric from the first mold;
Setting the rubber fabric taken out from the first mold in the molding cavity of the second mold and heating to advance foaming and vulcanization;
A method for producing a foamed rubber track pad, comprising: taking out the rubber fabric from the second mold.
該超硬質ゴムコンパウンドを圧延してシート状の超硬質ゴム生地とするステップと、
該シート状の超硬質ゴム生地を、前記矩形状のゴム生地と同じ縦及び横のサイズを有する矩形状の超硬質ゴム生地に切り出すステップと、
該矩形状の超硬質ゴム生地を、前記矩形状に切り出された複数のゴム生地と共に重ねて圧着して平板状のゴム生地とし、該超硬質ゴム生地が当該平板状のゴム生地の最上部層となるようにするステップと、
を有し、該超硬質ゴム生地を有する該平板状のゴム生地を前記第１金型及び前記第２金型にて加熱処理するようにした請求項１乃至６のいずれかに記載の製造方法。
A step of preparing an ultra-hard rubber compound containing natural rubber or synthetic rubber as a main component, containing carbon, and becoming an ultra-hard rubber when vulcanization is completed;
Rolling the ultra-hard rubber compound into a sheet-like ultra-hard rubber fabric;
Cutting the sheet-like super-hard rubber fabric into a rectangular super-hard rubber fabric having the same vertical and horizontal sizes as the rectangular rubber fabric;
The rectangular super-hard rubber fabric is overlapped with the plurality of rubber fabrics cut into the rectangular shape and pressed to form a flat rubber fabric, and the super-hard rubber fabric is the uppermost layer of the flat rubber fabric. Steps to become
The manufacturing method according to any one of claims 1 to 6, wherein the flat rubber fabric having the super-hard rubber fabric is heat-treated in the first mold and the second mold. .
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