JPH02305947A - Heat treatment of sectional mold for molding tire - Google Patents
Heat treatment of sectional mold for molding tireInfo
- Publication number
- JPH02305947A JPH02305947A JP12747689A JP12747689A JPH02305947A JP H02305947 A JPH02305947 A JP H02305947A JP 12747689 A JP12747689 A JP 12747689A JP 12747689 A JP12747689 A JP 12747689A JP H02305947 A JPH02305947 A JP H02305947A
- Authority
- JP
- Japan
- Prior art keywords
- tire
- heat treatment
- mold
- molding
- casting
- 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.)
- Pending
Links
- 238000000465 moulding Methods 0.000 title abstract description 22
- 238000010438 heat treatment Methods 0.000 title description 21
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 15
- 238000005266 casting Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000004881 precipitation hardening Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は鋳造により製作されたタイヤ成形用セクショナ
ルモールドの熱処理法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of heat treating a sectional mold for forming a tire manufactured by casting.
（従来の技術）
タイヤ成形用モールドはその踏面に複雑な模様が形成さ
れているため、一般的に鋳造性のよいアルミニウム合金
を鋳造することにより製作されており、特に鋳造性と機
械的特性とを考慮してＪＩＳＨ５２０２のＡＣＡ系の鋳
造用アルミニウム合金により製作されるのが普通である
。(Prior art) Tire molds have complex patterns formed on their treads, so they are generally manufactured by casting an aluminum alloy with good castability, and are particularly difficult to improve castability and mechanical properties. In consideration of this, it is usually manufactured using JISH5202 ACA-based aluminum alloy for casting.
ところがこの合金系は析出硬化型の合金であり、しかも
タイヤの成形加硫温度である１７０°Ｃ前後がアルミニ
ウム系合金の析出硬化処理温度と一致するため、タイヤ
の成形時にＭｇ、Ｓｉ を析出することにより寸法の膨
張を生じる。特にタイヤ成形用セクショナルモールドの
場合には、１〜３週間使用するうちに鋼製のシタルダ一
部（第２図の（２））に対してアルミニウム合金製のト
レッド部（第２図００））が膨張するために両者間に隙
間を生じて成形タイヤにスピユー（ゴムのはみ出し）が
発生し、これを削り取るために多くの工数を必要とする
という問題があった。However, this alloy is a precipitation hardening type alloy, and since the tire molding and vulcanization temperature of around 170°C matches the precipitation hardening temperature of aluminum alloys, Mg and Si precipitate during tire molding. This causes dimensional expansion. Particularly in the case of a sectional mold for tire molding, after 1 to 3 weeks of use, the tread part made of aluminum alloy (00 in Fig. 2) changes from the steel sitard part ((2) in Fig. 2). As the rubber expands, a gap is created between them, causing spills (rubber protruding) in the molded tire, which requires a lot of man-hours to scrape off.
またこのための対策として、トレッド部のセクターライ
ン部分を削り込んで成形を継続することもあるが、使用
中に逆にアルミニウム合金が若干収縮することがあるた
め、寸法不具合となるとともにセクターライン部分にや
はリスピユーが発生するという問題があった。In addition, as a countermeasure for this, the sector line part of the tread part may be ground down to continue forming, but the aluminum alloy may shrink slightly during use, resulting in dimensional defects and the sector line part Niya had a problem with respite.
（発明が解決しようとする課題）
本発明はこのような従来の問題点を解決して、タイヤの
成形中における寸法変化を極めて小さくしたタイヤ成形
用セクショナルモールドの熱処理法を提供するために完
成されたものである。(Problems to be Solved by the Invention) The present invention was completed in order to solve these conventional problems and provide a heat treatment method for a sectional mold for tire molding, which minimizes dimensional changes during tire molding. It is something that
（課題を解決するための手段）
上記の課題は、鋳造用アルミニウム合金により鋳造され
たタイヤ成形用セクショナルモールドを、２３０〜４２
０°Ｃの温度で４〜５０時間熱処理することを特徴とす
るタイヤ成形用セクショナルモールドの熱処理法により
解決することができる。(Means for Solving the Problem) The above problem is to solve the problem by using a sectional mold for tire forming made of aluminum alloy for casting.
This problem can be solved by a heat treatment method for a sectional tire mold, which is characterized by heat treatment at a temperature of 0°C for 4 to 50 hours.
このように２３０〜４２０°Ｃの温度で４〜５０時間熱
処理を行えば、鋳造用アルミニウム合金を過時効状態と
し、その後は析出物が生じるおそれをなくしてタイヤ成
形中の１７０°Ｃ程度の温度域では寸法変化を生じない
ようにすることができる。ここで熱処理温度を２３０〜
４２０°Ｃとしたのは、２３０°Ｃ未満では過時効状態
とするのに５０時間以上を要し、納期の点で実用限界を
越えることとなり、逆に４２０°Ｃを越えると析出物の
一部が再固溶し、タイヤ成形中の１７０°Ｃ程度の温度
域で再び寸法変化を生じるおそれがあるためである。ま
た熱処理時間を４〜５０時間と設定したのは、熱処理温
度が２３０℃の場合好ましい過時効状態を得るためには
５０時間、４２０℃の場合４時間を要するためである。If heat treatment is performed at a temperature of 230 to 420°C for 4 to 50 hours in this way, the aluminum alloy for casting will be in an overaged state, and after that, the risk of forming precipitates will be eliminated and the temperature of about 170°C during tire forming will be maintained. It is possible to prevent dimensional changes from occurring in the area. Here, the heat treatment temperature is 230~
The reason for setting the temperature at 420°C is that if it is lower than 230°C, it will take more than 50 hours to reach an overaged state, which will exceed the practical limit in terms of delivery time. This is because there is a risk that the dimensional change may occur again in the temperature range of about 170° C. during tire molding. The reason why the heat treatment time is set to 4 to 50 hours is because it takes 50 hours to obtain a preferable overaged state when the heat treatment temperature is 230°C, and 4 hours when the heat treatment temperature is 420°C.
なお鋳造用アルミニウム合金の種類は特に限定されるも
のではないが、タイヤ成形用セクショナルモールドは微
細模様の転写を要求されること、厚肉鋳造品であること
、押湯方案に制限があること等の理由により前記したＪ
ＩＳ Ｆ＋ ５２０２のへＣ４系の鋳造用アルミニウム
合金が適している。しかしＡＩ−ＳｉＡｌ−５ｉ−系の
鋳造用合金であればいずれの合金も適用可能である。The type of aluminum alloy for casting is not particularly limited, but sectional molds for tire molding require transfer of fine patterns, are thick-walled cast products, and there are restrictions on the feeder method. J mentioned above for the reason
Casting aluminum alloys of the C4 series of IS F+ 5202 are suitable. However, any AI-SiAl-5i-based casting alloy can be used.
次に本発明を実施例により具体的に説明する。Next, the present invention will be specifically explained using examples.
（実施例）
Ｃｕ １．０％、Ｓｉ ９．０％、Ｍｇ Ｏ，４％、残
部＾１及び不可避的不純物からなるＡＣｄ系の組成の鋳
造用アルミニウム合金を石膏鋳型により鋳造してタイヤ
成形用セクショナルモールドを製作した。次にこのタイ
ヤ成形用セクショナルモールドから直径２０ｍｍ、長さ
１００ ｃｍのテストピースを切り出し、本発明の範囲
内の次の３条件で熱処理を行った。(Example) An aluminum alloy for casting having an ACd-based composition consisting of 1.0% Cu, 9.0% Si, 4% MgO, the balance ^1 and unavoidable impurities was cast in a plaster mold for tire molding. I made a sectional mold. Next, a test piece with a diameter of 20 mm and a length of 100 cm was cut out from this sectional tire mold, and heat treated under the following three conditions within the scope of the present invention.
■２５０°Ｃ×４８時間熱処理後放冷
■３００’ＣＸ１２時間熱処理後炉冷
■３５０’ＣＸ６時間熱処理後炉冷
またこれと比較するため、本発明の範囲外の次の３条件
で熱処理を行った。■ Cooling after heat treatment at 250°C for 48 hours ■ Furnace cooling after heat treatment at 300'C for 12 hours ■ Furnace cooling after heat treatment at 350'C for 6 hours Also, for comparison, heat treatment was performed under the following three conditions outside the scope of the present invention. Ta.
■熱処理なしく従来品）
■１７０°Ｃ×４８時間熱処理後放冷
■４５０’ＣＸ６時間熱処理後炉冷
次に各テストピースをタイヤ成形の温度条件に合わせて
１７０°Ｃに保ち、時間の経過に伴う寸法変化を追跡調
査したところ、第１図に示されるとおりの結果が得られ
た。第１図から明らかなように、本発明の範囲内の■、
■、■の条件で熱処理したものはその後の寸法変化が極
めて少なかったが、■の無処理のものは大きい寸法変化
を示した。■ Conventional product without heat treatment) ■ Cooling after heat treatment at 170°C for 48 hours ■ Cooling in the furnace after heat treatment at 450'C for 6 hours Next, each test piece was kept at 170°C according to the temperature conditions of tire molding, and the time elapsed. A follow-up investigation of the dimensional changes caused by this process yielded the results shown in Figure 1. As is clear from FIG. 1, ■, which is within the scope of the present invention,
The samples heat-treated under the conditions (2) and (2) showed very little dimensional change after that, but the non-treated sample (2) showed a large dimensional change.
また本発明の範囲外の■は実用上問題となる寸法変化を
示し、■は寸法変化は■よりも少ないが、熱処理温度が
高いためにエネルギーコストを考慮すると実用的ではな
い。Further, ``■'' outside the scope of the present invention indicates a dimensional change that is a problem in practice, and ``■'' has a smaller dimensional change than ``■'', but is not practical in consideration of energy cost because the heat treatment temperature is high.
更に上記の鋳造用アルミニウム合金により第２図、第３
図に示されるようなタイヤ成形用セクショナルモールド
のトレッド部を鋳造したうえ、上記■と■の条件で熱処
理を施し、第２図に示す金型を作製し、実際のタイヤ成
形を行った。この結果、本発明の範囲内の■の熱処理を
施したものは不具合が発生しなかったが、本発明の範囲
外の■の熱処理を施したものは成形開始直後より膨張が
生じ、各セクションの相互間（Ａ部）及び鋼製のシッル
ダ一部（２）と鋳造アルミニウム合金製のトレッド部（
１）との間（Ｂ部）に隙間を生じてこの部分からスピユ
ーが発生した。そして成形されたタイヤからこれを削る
ために大きいコストアップとなった。Furthermore, by using the above aluminum alloy for casting,
A tread portion of a sectional mold for tire molding as shown in the figure was cast, and heat treatment was performed under the conditions of (1) and (2) above to produce the mold shown in Figure 2, and actual tire molding was carried out. As a result, no defects occurred in the products subjected to the heat treatment (■) within the scope of the present invention, but in the products subjected to the heat treatment (■) outside the scope of the present invention, expansion occurred immediately after the start of molding, and each section between each other (part A), the steel shield part (2) and the cast aluminum alloy tread part (
1) (part B), and a spill occurred from this part. And cutting this out of the molded tire resulted in a large cost increase.
（発明の効果）
本発明は以上に説明したように、鋳造後のタイヤ成形用
セクショナルモールドを、２３０〜４２０°Ｃの温度で
４〜５′θ時間熱処理することにより、タイヤの成形中
における寸法変化を極めて小さくすることに成功したも
のである。従って、本発明によれば成形時におけるスピ
ユーの発生を防止し、成形されたタイヤからスピユーを
削りとるための工数とコストとを大幅に減少させること
ができる。(Effects of the Invention) As explained above, the present invention heat-treats the sectional mold for tire molding after casting at a temperature of 230 to 420°C for 4 to 5'θ hours, thereby reducing the size during tire molding. This has succeeded in making the changes extremely small. Therefore, according to the present invention, it is possible to prevent the occurrence of spills during molding, and to significantly reduce the number of man-hours and cost for scraping spills from a molded tire.
よって本発明は従来の問題点を解決したタイヤ成形用セ
クショナルモールドの熱処理法として、産業の発展に寄
与するところは極めて大である。Therefore, the present invention greatly contributes to the development of industry as a heat treatment method for sectional molds for tire molding that solves the conventional problems.
第１図は実施例の各テストピースの寸法変化を示すグラ
フ、第２図はタイヤ成形用セクショナルモールドの側断
面図、第３図はそのトレッド部の平面図である。
（１） ： ）レッド部、（２）：ショルダ一部、Ａ部
ニドレッド部のセクターライン、FIG. 1 is a graph showing the dimensional changes of each test piece of the example, FIG. 2 is a sectional side view of a sectional mold for forming a tire, and FIG. 3 is a plan view of the tread portion thereof. (1) : ) Red part, (2) : Shoulder part, sector line of A part Nidred part,
Claims (1)
セクショナルモールドを、２３０〜４２０℃の温度で４
〜５０時間熱処理することを特徴とするタイヤ成形用セ
クショナルモールドの熱処理法。A sectional tire mold made of aluminum alloy for casting is heated at a temperature of 230 to 420°C for 4 hours.
A method for heat treating a sectional mold for forming a tire, the method comprising heat treating for ~50 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12747689A JPH02305947A (en) | 1989-05-19 | 1989-05-19 | Heat treatment of sectional mold for molding tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12747689A JPH02305947A (en) | 1989-05-19 | 1989-05-19 | Heat treatment of sectional mold for molding tire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02305947A true JPH02305947A (en) | 1990-12-19 |
Family
ID=14960881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12747689A Pending JPH02305947A (en) | 1989-05-19 | 1989-05-19 | Heat treatment of sectional mold for molding tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02305947A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62214161A (en) * | 1986-03-14 | 1987-09-19 | Nissan Motor Co Ltd | Cylinder block made of aluminum die casting |
-
1989
- 1989-05-19 JP JP12747689A patent/JPH02305947A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62214161A (en) * | 1986-03-14 | 1987-09-19 | Nissan Motor Co Ltd | Cylinder block made of aluminum die casting |
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