JP3371448B2 - Solid forming quenching method by pressure control - Google Patents
Solid forming quenching method by pressure controlInfo
- Publication number
- JP3371448B2 JP3371448B2 JP26029792A JP26029792A JP3371448B2 JP 3371448 B2 JP3371448 B2 JP 3371448B2 JP 26029792 A JP26029792 A JP 26029792A JP 26029792 A JP26029792 A JP 26029792A JP 3371448 B2 JP3371448 B2 JP 3371448B2
- Authority
- JP
- Japan
- Prior art keywords
- work
- solid forming
- quenching method
- pressure control
- mold
- 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.)
- Expired - Fee Related
Links
Landscapes
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Articles (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は自動車クラッチに使用さ
れるダイヤフラムスプリングの熱処理方法に関するもの
である。
【０００２】
【従来の技術】本発明に係る従来技術としては特公昭４
８−２９４４３号の公報がある。
【０００３】このものは円板状の鋼板を打抜き、８００
〜９００°Ｃに加熱後、０〜６０°Ｃに冷却された上型
下型よりなる金型にて６〜２０００ｋｇ／ｃｍ2 で加圧
して、前記打抜鋼板を円錐形状に加工すると同時に打抜
き鋼板の熱を金型に伝達して急冷して焼入れし、その後
成形及び焼入れの施された鋼板を取り出して焼戻しする
ことによりダイヤフラムスプリングを製造する方法であ
る。
【０００４】
【発明が解決しようとする課題】然し前記成形方法は、
高温に加熱されたダイヤフラムスプリング素材（以下ワ
ークという）を成形する場合に、冷却された金型にて、
円錐形状にプレス成形すると同時に焼入し、然もプレス
成形に要する大きな加圧力で焼入れ完了後も更に加圧し
続けるためにワークの一部に割れの発生があった。
【０００５】本発明はダイヤフラムスプリングの製造に
於いて、ワークを固体成形焼入方法にて製造しても、ワ
ークに割れの発生のない固体成形焼入方法を技術的課題
とするものである。
【０００６】
【課題を解決するための手段】そこで本発明では、成形
材料を加熱後、複数の型間において成形と同時に冷却す
る固体成形焼入方法において、前記型間においてマルテ
ンサイト変態開始温度にまで加圧冷却した後、加圧力を
漸次減少させて冷却を継続することを特徴とする固体成
形焼入方法とした。
【０００７】
【作用】ワークが５０〜１００ＴＯＮの加圧による円錐
形状に形成されると共に冷却水にて冷却された金型によ
り冷却されてワークの温度が２００〜３００°Ｃに降下
するとマルテンサイト変態がスタートし、ワークの温度
が約８０°Ｃになるとマルテンサイト変態は終了し焼入
が完了するが、この時間は約２〜１５秒間で、この間に
ワークの割れが発生するために、ワークの温度が約３０
０°Ｃまでは強大な圧力にてプレス加工により円錐形状
を形成し、それ以後はプレス加工の圧力を１／２以下に
することによりワークの割れを防止するものである。
【０００８】
【実施例】以下実施例について説明する。
【０００９】図１は自動車のクラッチに使用されるダイ
ヤフラムスプリングＡであり、１はスプリング部で２は
レバー部であり、図２はダイヤフラムスプリングＡの一
部破断した平面図である。
【００１０】次に本実施の固体成形焼入方法について説
明する。
【００１１】図示しない特公昭４８−２９４４３号に示
す従来の上型と、下型よりなる固体成形焼入装置を使用
し、上型と下型を冷却水にて０〜６０°Ｃに冷却する。
【００１２】（ａ）ワークである板厚約３ｍｍの鋼板よ
りなるダイヤフラムスプリング素材を図示しない加熱炉
にて８００°Ｃ〜９００°Ｃに加熱する。
【００１３】（ｂ）加熱炉より取り出したワークを固体
成形焼入装置の金型上に載置する。
【００１４】（ｃ）ワークを５０〜１００ＴＯＮの加圧
力にて加圧し、ワークの温度が冷却された金型に伝達さ
れて２００〜３００°Ｃに降下したら（この間約２〜５
秒）、前記加圧力を１／２以下に圧力調節を行って加圧
し約８０°Ｃになるまで加圧して焼入を完了する。
【００１５】（ｄ）次にワークを取り出して、ワークの
スプリング部の焼戻しを別工程で行う。
【００１６】以上の方法でダイヤフラムスプリングの熱
処理を完了するものである。
【００１７】
【発明の効果】成形材料を加熱後、型間においてマルテ
ンサイト変態開始温度にまで加圧冷却した後、加圧力を
漸次減少させて冷却を継続するため、材料の割れの発生
が少ない。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for heat-treating a diaphragm spring used in an automobile clutch. 2. Description of the Related Art Japanese Patent Publication No. Sho 4
There is a gazette of 8-29443. [0003] This is made by stamping a disk-shaped steel plate,
After heating to ９００900 ° C., pressurizing at 6 to 2,000 kg / cm 2 in a mold consisting of an upper die and a lower die cooled to 0 to 60 ° C. to process the punched steel sheet into a conical shape and simultaneously punching This is a method of manufacturing a diaphragm spring by transferring heat of a steel sheet to a mold, rapidly cooling and quenching, and then taking out and tempering the formed and quenched steel sheet. [0004] However, the molding method is
When molding a diaphragm spring material (hereinafter referred to as a work) heated to a high temperature, use a cooled mold
The work was quenched at the same time as the press forming into a conical shape, and the work continued to be further pressed after the quenching was completed with the large pressing force required for the press forming. An object of the present invention is to provide a method of manufacturing a diaphragm spring, in which a solid forming and quenching method in which a work is not cracked even when the work is manufactured by a solid forming and quenching method is a technical problem. [0006] In [SUMMARY OF] The present invention, after heating the molding material, at the same time the solid molding quenching method of cooling a molded between a plurality of types, Marte between said mold
After pressurizing and cooling to the temperature at which
A solid forming and quenching method is characterized in that the cooling is continued while gradually decreasing. The work is formed into a conical shape by applying a pressure of 50 to 100 TON, and is cooled by a mold cooled by cooling water. When the temperature of the work drops to 200 to 300 ° C., the martensitic transformation occurs. Starts, and when the temperature of the work reaches about 80 ° C., the martensitic transformation ends and quenching is completed, but this time is about 2 to 15 seconds. During this time, the work is cracked. Temperature is about 30
Up to 0 ° C., a conical shape is formed by press working with a strong pressure, and thereafter, the pressure of the press working is reduced to 以下 or less to prevent the work from cracking. An embodiment will be described below. FIG. 1 shows a diaphragm spring A used for a clutch of an automobile, 1 is a spring portion, 2 is a lever portion, and FIG. 2 is a partially broken plan view of the diaphragm spring A. Next, the solid forming and quenching method of the present embodiment will be described. Using a conventional solid forming and quenching apparatus comprising an upper mold and a lower mold as shown in JP-B-48-29443 (not shown), the upper mold and the lower mold are cooled to 0-60 ° C. with cooling water. . (A) A diaphragm spring material made of a steel plate having a thickness of about 3 mm, which is a work, is heated to 800 ° C. to 900 ° C. in a heating furnace (not shown). (B) The work taken out of the heating furnace is placed on a mold of a solid forming and quenching apparatus. (C) The work is pressurized with a pressing force of 50 to 100 TON, and the temperature of the work is transmitted to the cooled mold and dropped to 200 to 300 ° C. (During this period, about 2 to 5
Seconds), the pressure is adjusted to １ ／ or less, and the pressure is increased to about 80 ° C. to complete the quenching. (D) Next, the work is taken out and tempering of the spring portion of the work is performed in another step. The heat treatment of the diaphragm spring is completed by the above method. [0017] [Effect of the Invention] After heating the molding material, Marte between the mold
After pressurizing and cooling to the temperature at which
Since the cooling is continued while gradually decreasing, the occurrence of cracks in the material is small.
【図面の簡単な説明】
【図１】ダイヤフラムスプリングの外観斜視図である。
【図２】図１の一部破断した平面図である。
【図３】固体成形焼入装置によりワークを加工する場合
のワークの温度と加圧時間との関係を示す図である。
【符号の説明】
１ ダイヤフラムスプリングBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external perspective view of a diaphragm spring. FIG. 2 is a partially broken plan view of FIG. FIG. 3 is a diagram showing the relationship between the temperature of the work and the pressurization time when the work is processed by the solid forming and quenching apparatus. [Description of Signs] 1 Diaphragm spring
フロントページの続き (56)参考文献 特開 昭47−20006（ＪＰ，Ａ) 特公 昭48−29443（ＪＰ，Ｂ１) 特表 昭62−502795（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C21D 1/18 C21D 1/00 124 C21D 8/00 C21D 9/02 Continuation of the front page (56) References JP-A-47-20006 (JP, A) JP-B-48-29443 (JP, B1) JP-T-62-502795 (JP, A) (58) Fields investigated (Int .Cl. 7 , DB name) C21D 1/18 C21D 1/00 124 C21D 8/00 C21D 9/02
Claims (1)
形と同時に冷却する固体成形焼入方法において、前記型
間においてマルテンサイト変態開始温度にまで加圧冷却
した後、加圧力を漸次減少させて冷却を継続することを
特徴とする固体成形焼入方法。(57) [Claim 1] In a solid forming and quenching method in which a molding material is heated and then cooled at the same time as molding between a plurality of dies, pressurization to a martensitic transformation start temperature between the dies. A solid forming quenching method, characterized in that after cooling, the pressure is gradually reduced to continue cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26029792A JP3371448B2 (en) | 1992-09-29 | 1992-09-29 | Solid forming quenching method by pressure control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26029792A JP3371448B2 (en) | 1992-09-29 | 1992-09-29 | Solid forming quenching method by pressure control |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06108142A JPH06108142A (en) | 1994-04-19 |
| JP3371448B2 true JP3371448B2 (en) | 2003-01-27 |
Family
ID=17346089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26029792A Expired - Fee Related JP3371448B2 (en) | 1992-09-29 | 1992-09-29 | Solid forming quenching method by pressure control |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3371448B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE9602257L (en) * | 1996-06-07 | 1997-12-08 | Plannja Hardtech Ab | Ways to produce steel detail |
-
1992
- 1992-09-29 JP JP26029792A patent/JP3371448B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06108142A (en) | 1994-04-19 |
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