JPH08300066A - Production of die - Google Patents
Production of dieInfo
- Publication number
- JPH08300066A JPH08300066A JP14506495A JP14506495A JPH08300066A JP H08300066 A JPH08300066 A JP H08300066A JP 14506495 A JP14506495 A JP 14506495A JP 14506495 A JP14506495 A JP 14506495A JP H08300066 A JPH08300066 A JP H08300066A
- Authority
- JP
- Japan
- Prior art keywords
- die
- shot peening
- discharge machining
- layer
- steel
- 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
Landscapes
- Extrusion Of Metal (AREA)
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】この発明は冷間ダイス鋼、熱間ダ
イス鋼、高速度鋼など工具鋼を用いた高寿命金型の製造
方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a long-life die using tool steel such as cold die steel, hot die steel, and high speed steel.
【0002】[0002]
【従来の技術】ホビングにより製造される金型を熱処理
するとき、ワーク面の仕上げ加工が難しいため脱炭層が
残ったり、あるいは残留ひずみにより表層の組織が粗大
化するため表面硬さが低くなることが多い。特にギヤ型
等の複雑型上品では、機械的な仕上げ加工ができないた
め、通常そのまま使用するか、あるいは軟窒化処理、C
VD、あるいはPVD等により表面効果処理を行う。し
かしこの状態での使用では金型表面がすぐだれてしまっ
たり、あるいは表面処理の有効硬化層が浅いため期待す
るほどの効果が得られなかったりする場合が多い。2. Description of the Related Art When heat-treating a die manufactured by hobbing, it is difficult to finish the work surface, leaving a decarburized layer, or the residual strain causes the surface structure to become coarse, resulting in a low surface hardness. There are many. Especially for complex type elegance such as gear type, since mechanical finishing is not possible, it is usually used as it is, or soft nitriding treatment, C
Surface effect treatment is performed by VD, PVD, or the like. However, when used in this state, the surface of the mold is often sagged, or the desired effect cannot be obtained because the effective cured layer of the surface treatment is shallow.
【0003】[0003]
【発明が解決しようとする課題】本発明は、熱間ダイス
鋼、ハイス鋼を始めとする工具鋼を用いてホビングによ
り製造された金型に放電加工、機械加工により仕上げ加
工を行うことにより、金型ワーク面の軟化層や凹凸を除
去し、だれなどを防ぐ高寿命金型の製造方法を提案する
ものである。またホビング成形−熱処理後にショットピ
ーニング、あるいはショットピーニング後に放電加工、
機械加工による仕上げ加工を施し、深い加工硬化層を作
ることによってさらに高寿命な金型の製造方法を提案す
るものである。DISCLOSURE OF THE INVENTION The present invention provides a die manufactured by hobbing using hot die steel, tool steel such as high-speed steel, and finishing by machining by electric discharge machining, The present invention proposes a method of manufacturing a long-life mold that removes softening layers and irregularities on the mold work surface to prevent sagging. Hobbing molding-shot peening after heat treatment, or electrical discharge machining after shot peening,
The present invention proposes a method of manufacturing a die having a further long life by performing a finishing process by machining to form a deep work-hardened layer.
【0004】[0004]
【課題を解決するための手段】ホビングにより成形され
た金型表面(ワーク面)は、脱炭層や表層へのひずみ集
中のため粗大化した組織が表層に現れる等の問題があ
る。一般にホビング面を機械加工仕上げすることは、ホ
ビングの対象となる金型形状の点からみて難しい。また
化学的な表面処理だけでは十分に軟化層をなくすことが
できない場合がある。The mold surface (work surface) molded by hobbing has a problem that a coarse structure appears on the surface layer due to strain concentration on the decarburized layer or the surface layer. Generally, it is difficult to machine and finish the hobbing surface in terms of the shape of the mold to be hobbed. Further, there are cases where the softened layer cannot be removed sufficiently by only chemical surface treatment.
【0005】本発明は、ホビング−熱処理後のワーク面
に存在する軟化層を放電加工等による除去、あるいはシ
ョットピーニング、またはショットピーニング+放電加
工等による仕上げ加工により、深い有効加工硬化層を作
り出すことによって金型の高寿命化を可能にするもので
ある。According to the present invention, a deep effective work hardened layer is produced by removing a softening layer existing on a work surface after hobbing-heat treatment by electric discharge machining or by finish processing by shot peening or shot peening + electric discharge machining. This makes it possible to extend the life of the mold.
【0006】図1にJIS−SKD62を温間ホビング
(850℃)により製造したときの表層付近の硬さ分布
を示す。FIG. 1 shows the hardness distribution near the surface layer when JIS-SKD62 is manufactured by warm hobbing (850 ° C.).
【0007】表面から200μmぐらいの深さまで脱炭
による軟化層が確認できる。また冷間ホビングにより成
形した場合、後の焼き入れを行うことにより表層付近の
組織は粗大化することが確認されることが多い。A softened layer due to decarburization can be confirmed up to a depth of about 200 μm from the surface. Further, in the case of forming by cold hobbing, it is often confirmed that the structure near the surface layer is coarsened by subsequent quenching.
【0008】このような軟化層は、複雑形状品を対象と
するホビングしたものでは、機械加工等による除去は難
しい。Such a softening layer is difficult to remove by machining or the like when hobbing a complex shaped product.
【0009】図2にJIS−SKD62を600℃でホ
ビング(後方押しだし)した後、575℃で60分焼き
戻しを2回行った金型にHRC62−0.2mm硬球で
ショットピーニングを60秒施したものの硬さ分布を示
す。尚測定は加工面の側面で行った。In FIG. 2, JIS-SKD62 was hobbed (extruded backward) at 600 ° C., and then tempered twice at 575 ° C. for 60 minutes. The mold was shot peened with HRC62-0.2 mm hard balls for 60 seconds. The hardness distribution of the thing is shown. The measurement was performed on the side of the machined surface.
【0010】通常軟窒化処理では有効硬化層は数十ミク
ロン程度であるのに対し、ショットピーニングは非常に
深い硬化層が得られることが可能となることが、図2か
ら確認できる。It can be confirmed from FIG. 2 that the effective hardened layer is usually about several tens of microns in the soft nitriding treatment, whereas it is possible to obtain a very deep hardened layer in the shot peening.
【0011】しかしショットピーニング処理は金型表面
肌が若干粗くなってしまうため、何らかの表面加工を施
こさなければ、金型寿命が期待通りに延びないことがあ
る。However, the shot peening process causes the surface of the mold to become slightly rough, so the mold life may not be extended as expected unless some surface treatment is applied.
【0012】熱間鍛造における、1つの金型寿命評価項
目の1つとなるヒートクラック発生数と表面仕上げ処理
との関係を図3に示す。因みにダイスはJIS−SKD
62を600℃で温間ホビングにより製造し、焼き入れ
(1030℃×30min)−焼き戻し(575℃×1
80min)した後に(1)ショットブラストのみ、
(2)ショットブラスト+放電加工、(3)ショットピ
ーニング、(4)ショットピーニング+旋盤加工によっ
て仕上げた。なお鍛造温度は1000℃で、ヒートクラ
ック測定場所は、最も負荷のかかる絞りの部分とした。FIG. 3 shows the relationship between the number of heat cracks and surface finishing treatment, which is one of the items for evaluating die life in hot forging. By the way, the die is JIS-SKD.
62 was manufactured by warm hobbing at 600 ° C., quenched (1030 ° C. × 30 min) -tempered (575 ° C. × 1)
After 80 min), only (1) shot blasting,
(2) Shot blast + electric discharge machining, (3) shot peening, (4) shot peening + lathe machining. The forging temperature was 1000 ° C., and the heat crack measurement location was at the portion of the drawing where the load was applied most.
【0013】図3の結果から表面軟化層の除去、ショッ
トピーニング、あるいはショットピーニング+表面仕上
げ加工の効果が確認できる。From the results shown in FIG. 3, the effects of removing the surface softening layer, shot peening, or shot peening + surface finishing can be confirmed.
【0014】以下に本発明をさらに明確にするため、実
施例の詳述を述べる。表1にJIS−SKD62−ベベ
ルギヤ型を温間ホビング(鍛造温度600℃)−焼き入
れ(1030℃×30分/油冷)−焼き戻し(600℃
×90分/AC2回)により作成した後、各表面処理を
施した時の実機テスト結果を示す。尚表面処理は(A)
ショットブラスト、(B)ショットブラスト+放電加
工、(C)ショットピーニング、(D)ショットピーニ
ング+放電加工である。In order to further clarify the present invention, the detailed description of the embodiments will be given below. Table 1 shows JIS-SKD62-bevel gear type warm hobbing (forging temperature 600 ° C.)-Quenching (1030 ° C. × 30 minutes / oil cooling) -tempering (600 ° C.
After 90 minutes / AC 2 times), the actual machine test results when each surface treatment was performed are shown. The surface treatment is (A)
These are shot blasting, (B) shot blasting + electric discharge machining, (C) shot peening, and (D) shot peening + electric discharge machining.
【0015】[0015]
【表1】 [Table 1]
【0016】表1の結果より表面硬さが高く、しかも表
面を仕上げ加工したものの方が金型寿命は延びることが
確認できる。From the results shown in Table 1, it can be confirmed that the surface hardness is higher and the mold life is extended when the surface is finished.
【0017】以上の実施例のようにホビングにより作成
された金型のワーク面に、放電仕上げ加工、ショットピ
ーニング、あるいはショットピーニング+放電仕上げ加
工を行うことにより金型寿命は延びることが確認でき
る。It can be confirmed that the die life is extended by performing electrical discharge finishing, shot peening, or shot peening + electrical discharge finishing on the work surface of the die made by hobbing as in the above embodiments.
【0018】以上本発明の実施例を詳述したがこれはあ
くまで一例であり、本発明はその主旨を逸脱しない範囲
において、当業者の知識に基づき様々な変更を加えた態
様で実施可能である。The embodiment of the present invention has been described in detail above, but this is merely an example, and the present invention can be implemented in a mode in which various modifications are made based on the knowledge of those skilled in the art without departing from the spirit of the invention. .
【発明の効果】本発明を用いた金型の製造方法により、
ホビング−熱処理後に生成する金型表面の軟化層を完全
に取り除くことができるため、金型寿命を延ばすことが
可能となる。EFFECT OF THE INVENTION By the method of manufacturing a mold according to the present invention,
Hobbing-Since the softened layer on the mold surface generated after heat treatment can be completely removed, the mold life can be extended.
【図1】温間ホビング後の表面付近の硬さ分布を示した
図である。FIG. 1 is a diagram showing a hardness distribution near a surface after warm hobbing.
【図2】ホビング後にショットピーニングを施した時の
硬さ分布を示した図である。FIG. 2 is a diagram showing a hardness distribution when shot peening is performed after hobbing.
【図3】金型の表面仕上げ処理とヒートクラック数の関
係を示した図である。FIG. 3 is a diagram showing the relationship between the surface finishing treatment of the mold and the number of heat cracks.
Claims (3)
工具鋼を用いて、ホビングにより製造された金型のワー
ク面に、放電加工、あるいは機械加工仕上げすることに
よって金型の寿命を向上させる製造方法。1. A tool life, such as hot die steel and high-speed steel, is improved by subjecting a work surface of a die manufactured by hobbing to electrical discharge machining or machining. Manufacturing method.
工具鋼を用いて、ホビングにより製造された金型のワー
ク面に、ショットピーニングを施すことによって金型の
寿命を向上させる製造方法。2. A manufacturing method for improving the life of a mold by subjecting a work surface of a mold manufactured by hobbing to shot peening using tool steel such as hot die steel and high speed steel.
工具鋼を用いて、ホビングにより製造された金型のワー
ク面に、ショットピーニングを施した後に放電加工、あ
るいは機械加工仕上げすることによって金型の寿命を向
上させる製造方法。3. A workpiece surface of a die manufactured by hobbing using tool steel such as hot die steel and high speed steel is subjected to shot peening and then electrical discharge machining or machining finishing. A manufacturing method for improving the life of a mold.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14506495A JPH08300066A (en) | 1995-05-09 | 1995-05-09 | Production of die |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14506495A JPH08300066A (en) | 1995-05-09 | 1995-05-09 | Production of die |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH08300066A true JPH08300066A (en) | 1996-11-19 |
Family
ID=15376551
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14506495A Pending JPH08300066A (en) | 1995-05-09 | 1995-05-09 | Production of die |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH08300066A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008081858A1 (en) * | 2006-12-28 | 2008-07-10 | Aichi Steel Corporation | Method of improving life of die for hot or warm forging |
JP4601017B1 (en) * | 2010-03-03 | 2010-12-22 | 株式会社ユニオン精密 | Heading tool |
WO2013123396A1 (en) * | 2012-02-17 | 2013-08-22 | Alcoa Inc. | Dies for shaping containers and methods for making same |
CN114918617A (en) * | 2022-05-20 | 2022-08-19 | 无锡市通亦和精密机械有限公司 | Steel seal processing technology for lettering of mold |
-
1995
- 1995-05-09 JP JP14506495A patent/JPH08300066A/en active Pending
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008081858A1 (en) * | 2006-12-28 | 2008-07-10 | Aichi Steel Corporation | Method of improving life of die for hot or warm forging |
JP4601017B1 (en) * | 2010-03-03 | 2010-12-22 | 株式会社ユニオン精密 | Heading tool |
JP2011177767A (en) * | 2010-03-03 | 2011-09-15 | Union Seimitsu:Kk | Pressing tool |
WO2013123396A1 (en) * | 2012-02-17 | 2013-08-22 | Alcoa Inc. | Dies for shaping containers and methods for making same |
CN103317014A (en) * | 2012-02-17 | 2013-09-25 | 美铝公司 | Dies for shaping containers and methods for making same |
CN114918617A (en) * | 2022-05-20 | 2022-08-19 | 无锡市通亦和精密机械有限公司 | Steel seal processing technology for lettering of mold |
CN114918617B (en) * | 2022-05-20 | 2023-09-26 | 通亦和精工科技(无锡)股份有限公司 | Embossed seal processing technology for mould lettering |
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