JPH0880585A - Method and mold for producing rubber crawler - Google Patents
Method and mold for producing rubber crawlerInfo
- Publication number
- JPH0880585A JPH0880585A JP24229994A JP24229994A JPH0880585A JP H0880585 A JPH0880585 A JP H0880585A JP 24229994 A JP24229994 A JP 24229994A JP 24229994 A JP24229994 A JP 24229994A JP H0880585 A JPH0880585 A JP H0880585A
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- rubber crawler
- mold
- cavity
- crawler
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はゴムクロ−ラの製造法及
びそのモ−ルドに関し、ゴムクロ−ラの製造時にゴムに
加わる熱膨張歪の影響を少なくしてゴムクロ−ラの耐久
性を向上するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a rubber crawler and a mold thereof, and reduces the influence of thermal expansion strain applied to the rubber during the manufacture of the rubber crawler to improve the durability of the rubber crawler. It is a thing.
【０００２】[0002]
【従来の技術】ゴムクロ−ラは通常有端のベルト状とし
て形成され、この両端を再加硫することによって無端状
とする方法が採られている。そして、ゴムクロ−ラの内
外の形状を形成する２分割されたモ−ルドが利用されて
いる。そして、通常はゴムクロ−ラの内面を形成する側
のモ−ルドを下側とし、この下モ−ルドのキャビティ内
に内周側面を構成する未加硫ゴム、スチ−ルコ−ドバン
ド、外周面を形成する未加硫ゴムを、場合によってはゴ
ム中に埋設される芯金や織布等を順次重ね合わせ、上モ
−ルドを閉じて加圧加熱するものである。2. Description of the Related Art A rubber crawler is usually formed as an endless belt, and a method is adopted in which both ends are revulcanized to form an endless belt. Then, a mold divided into two parts that forms the inner and outer shapes of the rubber crawler is used. Usually, the mold on the side that forms the inner surface of the rubber crawler is the lower side, and the unvulcanized rubber, the steel cord band, and the outer peripheral surface that form the inner peripheral side surface in the cavity of this lower mold. The unvulcanized rubber forming the above is sequentially laminated with a cored bar, a woven fabric, etc., which are embedded in the rubber, and the upper mold is closed and heated under pressure.
【０００３】図４はこの従来技術の一例を示す断面図で
あって、上下モ−ルド１１、１２とゴムクロ−ラを構成
する各材料を示したものである。即ち、下モ−ルド１１
のキャビティａ内にゴムクロ−ラの内周側面を構成する
未加硫ゴムＡ、芯金Ｂ、スチ−ルコ−ドバンドＣ、ゴム
クロ−ラの外周側面を構成する未加硫ゴムＤを順次重ね
合わせ、これらを上モ−ルド１２にて閉じ、加圧加熱す
ることによって未加硫ゴムを加硫し、ゴムクロ−ラを形
成するものである。FIG. 4 is a cross-sectional view showing an example of this prior art, showing the materials constituting the upper and lower molds 11 and 12 and the rubber crawler. That is, lower mold 11
The unvulcanized rubber A, the core metal B, the steel cord band C, and the unvulcanized rubber D, which form the outer peripheral side surface of the rubber crawler, are successively superposed in the cavity a of the rubber crawler. The unvulcanized rubber is vulcanized by closing these in the upper mold 12 and heating under pressure to form a rubber crawler.
【０００４】[0004]
【発明が解決しようとする課題】しかるに、このように
して得られたゴムクロ−ラは、上下モ−ルドの合わせ面
に添ってゴム劣化、例えばひび割れ等が発生し、これに
起因してゴムクロ−ラの耐久性を低下させることともな
っていた。However, in the rubber crawler thus obtained, rubber deterioration such as cracks occurs along the mating surfaces of the upper and lower molds, which causes the rubber crawler. It was also supposed to reduce the durability of LA.
【０００５】本発明は、この上下モ−ルドの合わせ面に
生じるゴムのひび割れ等のゴム劣化を防止する製造法及
びこれに用いるモ−ルドを提供するものである。The present invention provides a manufacturing method for preventing deterioration of rubber such as cracking of rubber which occurs on the mating surfaces of the upper and lower molds and a mold used for the manufacturing method.
【０００６】[0006]
【課題を解決するための手段】本発明は以上の目的を達
成するためになされたものであって、その第１は、ゴム
クロ−ラの内外形状を形成するキャビティをもつ上下モ
−ルドの当該キャビティ内にゴムクロ−ラを構成する未
加硫ゴム、スチ−ルコ−ドバンド、場合によっては芯金
等を配置して加圧加熱するゴムクロ−ラの製造法におい
て、上下モ−ルドの合わせ面のキャビティ側において、
その少なくとも一方側に面取り加工を施し、キャビティ
内のゴムの熱膨張による伸長歪を平均化させたことを特
徴とするゴムクロ−ラの製造法に係るものである。SUMMARY OF THE INVENTION The present invention has been made to achieve the above objects, and the first of the invention is to provide an upper and lower mold having a cavity for forming the inner and outer shapes of a rubber crawler. In the method of manufacturing a rubber crawler in which an unvulcanized rubber, a steel cord band, and in some cases a cored bar, which constitute a rubber crawler, are placed in a cavity and heated under pressure, the mating surfaces of the upper and lower molds are On the cavity side,
At least one side thereof is chamfered to average elongation strain due to thermal expansion of rubber in the cavity.
【０００７】そして、第２は、ゴムクロ−ラの内外形状
を形成するキャビティを、ゴムクロ−ラの縁端部で分割
した構造の上下モ−ルドであって、当該上下モ−ルドの
キャビティ側の合わせ面の少なくとも一方に面取りした
ことを特徴とするゴムクロ−ラ製造用モ−ルドに係り、
この面取り角度を３０〜６０度とし、更に、面取り長さ
を１〜１０ｍｍとしたゴムクロ−ラ製造用モ−ルドに係
るものである。The second is an upper and lower mold having a structure in which a cavity forming the inner and outer shapes of the rubber crawler is divided at an edge portion of the rubber crawler, and the cavity side of the upper and lower molds is located on the cavity side. According to a rubber crawler manufacturing mold characterized by chamfering on at least one of the mating surfaces,
The chamfered angle is 30 to 60 degrees, and the chamfered length is 1 to 10 mm.
【０００８】[0008]
【作用】本発明の第１をもって説明すれば、未加硫ゴム
のキャビティ内での加硫時にあって、上下モ−ルドの合
わせ面のキャビティ側に好ましくはその両側に面取り加
工を施したモ−ルドを使用するものである。According to the first aspect of the present invention, at the time of vulcanization of unvulcanized rubber in the cavity, the cavity side of the mating surfaces of the upper and lower molds is chamfered, preferably on both sides thereof. -It uses a field.
【０００９】前記した図４は従来のゴムクロ−ラの上下
モ−ルドであるが、上下モ−ルド１１、１２の合わせ面
のキャビティ側１１0 、１２0 の部位が略直角に形成さ
れている。しかるに、キャビティ内に充填された未加硫
ゴムが加圧加熱されると、ゴムの熱膨張によりこの合わ
せ面に向かって大きな力で流動をもたらし、その際、ゴ
ムに対してモ−ルドの合わせ部端、即ち１１0 、１２0
の部位から与えられる熱によってゴムに伸長歪が集中す
ることとなる。[0009] aforementioned 4 prior Gomukuro - is a field, the vertical mode - - vertical mode La cavity side 11 mating surface of the shield 11, 12 0, 12 0 sites are substantially right angle formed . However, when the unvulcanized rubber filled in the cavity is heated under pressure, the thermal expansion of the rubber causes a flow with a large force toward this mating surface. part end, i.e. 11 0, 12 0
The elongation strain is concentrated on the rubber due to the heat applied from the part.
【００１０】このようにして得られたゴムクロ−ラは、
モ−ルドの合わせ面に対向してゴム劣化が進んでおり、
このためゴムに亀裂が入ったりぼろぼろになったりする
ことがしばしば見られるところであり、これは、加圧加
熱成形時に、モ−ルドの合わせ部、即ち鋭角な部位によ
るゴムの熱膨張による伸長歪が集中することが原因と考
えられている。The rubber crawler thus obtained is
Rubber deterioration is progressing facing the mating surface of the mold,
For this reason, it is often seen that the rubber is cracked or broken, and this is because the extension strain due to the thermal expansion of the rubber due to the joint portion of the mold, that is, the acute angle portion, is caused during the pressure heat molding. Concentration is believed to be the cause.
【００１１】本発明はこの加圧加熱時のゴムの伸長歪の
集中を避けるために工夫されたものであって、上下モ−
ルドの合わせ面のキャビティ側に面取りを行ったもので
あり、伸長歪の集中を防止し、ゴムの亀裂等の劣化をな
くしたものである。この面取りにあっては、好ましく
は、上下モ−ルドの両方に面取りを行うことが望まし
い。又、キャビティに対する面取り部の傾斜角度は、用
いられる未加硫ゴムの種類にもよるが、３０〜６０度程
度の傾斜角をもって面取りされるのがよく、更に、面取
り長さもゴム質によるが通常は１〜１０ｍｍ程度であ
る。いずれも熱集中によるゴムへの影響を緩和するため
になされるものである。The present invention has been devised in order to avoid the concentration of elongation strain of rubber during heating under pressure.
Chamfering is performed on the cavity side of the mating surface of the joints to prevent the concentration of extension strain and prevent deterioration such as rubber cracks. In this chamfering, it is preferable to chamfer both the upper and lower molds. Further, the inclination angle of the chamfered portion with respect to the cavity depends on the type of unvulcanized rubber used, but it is preferable that chamfering is performed with an inclination angle of about 30 to 60 degrees. Is about 1 to 10 mm. Both are done to reduce the effect of heat concentration on rubber.
【００１２】[0012]
【実施例】以下、本発明を更に図面等をもって詳細に説
明する。図１は本発明の第２であるゴムクロ−ラ製造用
モ−ルドの断面図である。即ち、ゴムクロ−ラの内面を
形成するキャビティａを有する下モ−ルド１と、外面を
形成するキャビティｂを有する上モ−ルド２とよりなる
ものであり、この例では、下モ−ルド１のキャビティａ
は、ゴムクロ−ラの厚さＴの約半分の深さと、後述する
芯金の突起が収納される凹み３が一定ピッチをもって長
手方向に形成され、一方、上モ−ルド２にはゴムクロ−
ラの厚さＴの約半分の深さと、ゴムラグが形成されるた
めの凹み４が形成されている。そして、上下モ−ルドを
合わせることとなるが、この合わせ面のキャビティａ、
ｂ側のコ−ナ−を約４５度の傾斜Θをもって５ｍｍの長
さＬに面取り（Ｐ）したものである。The present invention will be described in detail below with reference to the drawings. FIG. 1 is a cross-sectional view of a rubber cradle manufacturing mold according to a second embodiment of the present invention. That is, it is composed of a lower mold 1 having a cavity a forming the inner surface of the rubber crawler and an upper mold 2 having a cavity b forming the outer surface thereof. In this example, the lower mold 1 is formed. The cavity a
Is approximately half the thickness T of the rubber crawler, and the recesses 3 for accommodating the protrusions of the cored bar, which will be described later, are formed in the longitudinal direction at a constant pitch, while the upper mold 2 is provided with the rubber crawler.
A depth of about half the thickness T of the la and a recess 4 for forming a rubber lug are formed. Then, the upper and lower molds are aligned, and the cavity a on this mating surface is
The corner on the b side is chamfered (P) to a length L of 5 mm with an inclination Θ of about 45 degrees.
【００１３】このことにより、キャビティａ、ｂ内に充
填されるゴムに対して、合わせ面のコ−ナ−部より特に
熱膨張による伸長歪の集中供給を避けることができるこ
ととなったものである。As a result, it is possible to avoid the concentrated supply of the elongation strain due to the thermal expansion, particularly to the corner portions of the mating surfaces, with respect to the rubber filled in the cavities a and b. .
【００１４】さて、第１発明に言及するが、図２に示す
ように、図１に示した下モ−ルド１のキャビティａ内
に、ゴムクロ−ラの内周側を構成する長尺の未加硫ゴム
Ａを２条載置し、次いで芯金Ｂの突起をキャビティａの
凹み３に合致させるように置き並べ、この芯金Ｂの翼部
の左右に分断してスチ−ルコ−ドバンドＣを置き、更に
ゴムクロ−ラの外周側を形成する未加硫ゴムＤをこの上
に置いた後に、図３にて示すように上モ−ルド２を閉め
る。尚、スチ−ルコ−ドバンドＣは複数本のスチ−ルコ
−ドを並べ、これに両側より未加硫ゴムシ−トを重ね合
わせてバンド状としたものである。Now, referring to the first invention, as shown in FIG. 2, in the cavity a of the lower mold 1 shown in FIG. Two vulcanized rubbers A are placed, and then the protrusions of the cored bar B are aligned and aligned so as to match the recesses 3 of the cavity a, and the steel cord band C is divided into right and left wings of the cored bar B. , And the unvulcanized rubber D forming the outer peripheral side of the rubber crawler is placed thereon, and then the upper mold 2 is closed as shown in FIG. The steel cord band C is formed by arranging a plurality of steel cords and superposing unvulcanized rubber sheets on both sides thereof to form a band.
【００１５】そして、例えば１５０ｋｇ／ｃｍ2 の圧
力、１７０℃、７０分の条件にて加圧加熱しゴムクロ−
ラを得た。得られたゴムクロ−ラにあっては、上下モ−
ルドの突き合わせ面にゴムの劣化を生じることがなくな
ったものである。Then, for example, under a condition of a pressure of 150 kg / cm 2 , 170 ° C. and 70 minutes, pressure is applied to heat the rubber rubber.
Got la In the obtained rubber crawler, the upper and lower moulds
The rubber does not deteriorate on the contact surface of the rudder.
【００１６】[0016]
【発明の効果】本発明は以上の構成を有しており、この
発明によって得られたゴムクロ−ラは上下モ−ルドの合
わせ面でのゴム劣化はなく、耐久性に優れたものとなっ
た。The present invention has the above-mentioned constitution, and the rubber crawler obtained by the present invention is excellent in durability without rubber deterioration at the mating surfaces of the upper and lower molds. .
【図１】図１は第２発明のゴムクロ−ラ製造用モ−ルド
の断面図である。FIG. 1 is a cross-sectional view of a rubber crawler manufacturing mold of a second invention.
【図２】図２は第１発明のゴムクロ−ラの製造法の第１
ステップ時の状態図である。FIG. 2 is a first diagram showing a first method for producing a rubber crawler of the first invention.
It is a state diagram at the time of step.
【図３】図３は第１発明のゴムクロ−ラの製造法の第２
ステップ時の状態図である。FIG. 3 is a second drawing of the method for producing the rubber crawler of the first invention.
It is a state diagram at the time of step.
【図４】図４はこの従来技術の一例を示す断面図であ
る。FIG. 4 is a sectional view showing an example of this conventional technique.
１‥‥下モ−ルド、 ２‥‥上モ−ルド、 ３‥‥芯金の突起が収納される凹み、 ４‥‥ゴムラグ形成のための凹み、 ａ‥‥ゴムクロ−ラの内面を形成するキャビティ、 ｂ‥‥ゴムクロ−ラの外面を形成するキャビティ、 Ａ‥‥ゴムクロ−ラの内周側を構成する未加硫ゴム、 Ｂ‥‥芯金、 Ｃ‥‥スチ−ルコ−ドバンド、 Ｄ‥‥ゴムクロ−ラの外周側を形成する未加硫ゴム、 Ｐ‥‥面取り部、 Θ‥‥面取り部の傾斜角、 Ｌ‥‥面取り部の長さ。 1 ... Lower mold, 2 ... Upper mold, 3 ... Recess for accommodating protrusion of core metal, 4 ... Recess for forming rubber lug, a ... Forming inner surface of rubber crawler Cavity, b ... Cavity forming outer surface of rubber crawler, A ... Unvulcanized rubber constituting inner circumference side of rubber crawler, B ... Core bar, C ... Steel cord band, D ... Unvulcanized rubber that forms the outer circumference of the rubber crawler, P ... Chamfer, Θ ... Chamfer inclination angle, L ... Chamfer length.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ２９Ｋ 105:24 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location B29K 105: 24
Claims (4)
ビティをもつ上下モ−ルドの当該キャビティ内にゴムク
ロ−ラを構成する未加硫ゴム、スチ−ルコ−ドバンド、
場合によっては芯金等を配置して加圧加熱するゴムクロ
−ラの製造法において、上下モ−ルドの合わせ面のキャ
ビティ側において、その少なくとも一方側に面取り加工
を施し、キャビティ内のゴムの熱膨張による伸長歪を平
均化させたことを特徴とするゴムクロ−ラの製造法。1. An unvulcanized rubber, a steel cord band, which constitutes a rubber crawler in the upper and lower mold cavities having cavities for forming inner and outer shapes of the rubber crawler,
Depending on the case, in a method of manufacturing a rubber crawler in which a core metal or the like is placed and heated under pressure, at least one side of the cavity side of the upper and lower mold mating surfaces is chamfered to heat the rubber in the cavity. A method for producing a rubber crawler characterized by averaging elongation strain due to expansion.
ビティを、ゴムクロ−ラの縁端部で分割した構造の上下
モ−ルドであって、当該上下モ−ルドのキャビティ側の
合わせ面の少なくとも一方に面取りしたことを特徴とす
るゴムクロ−ラ製造用モ−ルド。2. An upper and lower mold having a structure in which a cavity forming the inner and outer shapes of the rubber crawler is divided at an edge portion of the rubber crawler, and at least a mating surface on the cavity side of the upper and lower mold. A mold for manufacturing a rubber crawler, which is chamfered on one side.
第２項記載のゴムクロ−ラ製造用モ−ルド。3. The mold for producing a rubber crawler according to claim 2, wherein the chamfering angle is 30 to 60 degrees.
第２項記載のゴムクロ−ラ製造用モ−ルド。4. The mold for producing a rubber crawler according to claim 2, wherein the chamfered length is 1 to 10 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24229994A JP3295554B2 (en) | 1994-09-10 | 1994-09-10 | Method for producing rubber crawler and its mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24229994A JP3295554B2 (en) | 1994-09-10 | 1994-09-10 | Method for producing rubber crawler and its mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0880585A true JPH0880585A (en) | 1996-03-26 |
| JP3295554B2 JP3295554B2 (en) | 2002-06-24 |
Family
ID=17087171
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24229994A Expired - Lifetime JP3295554B2 (en) | 1994-09-10 | 1994-09-10 | Method for producing rubber crawler and its mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3295554B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010046813A (en) * | 2008-08-19 | 2010-03-04 | Sumitomo Rubber Ind Ltd | Device of manufacturing rubber crawler |
| JP2013209094A (en) * | 2013-06-14 | 2013-10-10 | Bridgestone Corp | Method for manufacturing rubber crawler |
-
1994
- 1994-09-10 JP JP24229994A patent/JP3295554B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010046813A (en) * | 2008-08-19 | 2010-03-04 | Sumitomo Rubber Ind Ltd | Device of manufacturing rubber crawler |
| JP2013209094A (en) * | 2013-06-14 | 2013-10-10 | Bridgestone Corp | Method for manufacturing rubber crawler |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3295554B2 (en) | 2002-06-24 |
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