JPH10217122A - Treatment method for metal mold surface - Google Patents
Treatment method for metal mold surfaceInfo
- Publication number
- JPH10217122A JPH10217122A JP3331397A JP3331397A JPH10217122A JP H10217122 A JPH10217122 A JP H10217122A JP 3331397 A JP3331397 A JP 3331397A JP 3331397 A JP3331397 A JP 3331397A JP H10217122 A JPH10217122 A JP H10217122A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- heat
- metal mold
- peening
- treated
- 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
- Heat Treatment Of Articles (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、熱処理された鍛造ある
いはプレス用金型をピーニング処理したとき、その金型
表面について表面粗さの極小化や圧縮残留応力の最大値
化をもたらすのに好適な処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for minimizing the surface roughness and maximizing the compressive residual stress on the surface of a heat-treated forging or pressing die when the die is subjected to peening. Processing method.
【0002】[0002]
【従来の技術】一般に、金型表面の機械的性質を向上さ
せることを目的として、焼き入れ・焼き戻しの熱処理
や、投射材を投射するピーニング処理が行なわれてい
る。2. Description of the Related Art Generally, quenching and tempering heat treatments and a peening process for projecting a shot material are performed for the purpose of improving the mechanical properties of a mold surface.
【0003】[0003]
【発明が解決しようとする課題】しかし、これらの処理
を行なっても、従来の一般的な処理では種々問題があ
り、特に鍛造に用いられる金型にあっては、上記の処理
を行なっても、いわゆるかじりが早期に発生して金型の
寿命が比較的短かくなったり、かじりによるクラックの
発生で寿命が短かくなる問題があった。そのため、本願
発明の発明者がかじりの発生原因について調査を行なっ
た結果、金型の表面粗さがかじりの発生に大きく起因す
ることが分かった。加えて、従来のピーニング処理方法
では金型表面に生成される圧縮残留応力の最大値が、図
1に示すように、金型表面から金型内に若干入った位置
に生じ、そのため、従来はその最大値が金型表面に位置
すべく、ピーニング処理後金型表面を研削する必要があ
るなどの問題があった。本発明は上記の事情に鑑みてな
されたもので、その目的は、金型表面の機械的性質を向
上させることが可能な方法、すなわち金型の表面粗さを
極小化することが可能な方法と、金型表面に圧縮残留応
力の最大値を生成させることが可能な方法を提供するこ
とにある。However, even if these treatments are performed, there are various problems in the conventional general treatments, and particularly in the case of a die used for forging, even if the above treatments are performed. In other words, there is a problem that the so-called galling occurs early and the life of the mold is relatively shortened, or the life of the mold is shortened due to generation of cracks due to the galling. Therefore, as a result of an investigation of the cause of galling by the inventor of the present invention, it was found that the surface roughness of the mold was largely caused by galling. In addition, in the conventional peening method, the maximum value of the compressive residual stress generated on the mold surface is generated at a position slightly inside the mold from the mold surface as shown in FIG. There was a problem that the die surface had to be ground after the peening treatment so that the maximum value was located on the die surface. The present invention has been made in view of the above circumstances, and has as its object a method capable of improving the mechanical properties of the mold surface, that is, a method capable of minimizing the surface roughness of the mold. Another object of the present invention is to provide a method capable of generating a maximum value of compressive residual stress on a mold surface.
【0004】[0004]
【課題を解決するための手段】上記の目的を達成するた
めに請求項1記載の発明における金型表面の処理方法
は、熱処理された金型の表面をピーニング処理したとき
にこの処理面の表面粗さを極小にすることが可能な方法
であって、熱処理した金型の表面に対して、硬度が熱処
理後の金型表面のビッカース硬度HVの80〜160%
でありかつ粒子径が30〜150μmであるほぼ球径の
投射材を、速度20〜150m/sで投射することを特
徴とする。また、請求項2記載の発明における金型表面
の処理方法は、熱処理された金型の表面をピーニング処
理したときにこの処理面の表面近傍に圧縮残留応力の最
大値を生成することが可能な方法であって、熱処理した
金型の表面に対して、比重が11〜20でかつ粒子径が
30〜150μmであるほぼ球径の投射材を、速度20
〜150m/sで投射することを特徴とする。また、請
求項3記載の発明における金型表面の処理方法は、熱処
理された金型の表面をピーニング処理したときにこの処
理面の表面近傍に圧縮残留応力の最大値を生成すること
が可能な方法であって、熱処理した金型の表面に対して
複数回のピーニング処理を行ない、この複数回のピーニ
ング処理のうち少なくとも1回のピーニング処理の投射
材については、比重をより重く、粒子径をより小さく、
かつ、硬さをより硬くしたことを特徴とする。According to a first aspect of the present invention, there is provided a method for treating a surface of a mold, wherein the surface of the heat-treated mold is subjected to a peening treatment. A method capable of minimizing roughness, wherein the hardness of the heat-treated mold surface is 80 to 160% of the Vickers hardness HV of the heat-treated mold surface.
And a projection material having a particle diameter of 30 to 150 μm and a substantially spherical diameter is projected at a speed of 20 to 150 m / s. The method of treating a mold surface according to the second aspect of the present invention can generate a maximum value of compressive residual stress in the vicinity of the surface of the treated surface when the surface of the heat-treated mold is peened. In this method, a substantially spherical blast material having a specific gravity of 11 to 20 and a particle size of 30 to 150 μm is applied to a surface of a heat-treated mold at a speed of 20.
It is characterized by projecting at ~ 150 m / s. In the method for treating a mold surface according to the third aspect of the present invention, it is possible to generate a maximum value of compressive residual stress near the surface of the treated surface when the surface of the heat-treated mold is peened. The method comprises performing a plurality of peening processes on the surface of the heat-treated mold, and among the plurality of peening processes, the shot material of at least one peening process has a higher specific gravity and a reduced particle diameter. Smaller,
In addition, it is characterized by having a higher hardness.
【0005】[0005]
【作用】請求項1〜3記載の発明においては、ピーニン
グ処理後金型の表面粗さがRa1.0μm以下になるた
め、かじりの発生が遅くなる。また、請求項2および3
記載の発明においては、圧縮残留応力の最大値が金型表
面に生成されることとなる。According to the present invention, since the surface roughness of the die after the peening treatment becomes 1.0 μm or less, the occurrence of galling is delayed. Claims 2 and 3
In the described invention, the maximum value of the compressive residual stress is generated on the mold surface.
【0006】ここで、金型とは、いわゆる金型用鋼を材
料にして製作した型であって、鍛造やプレスに用いるも
のをいう。また、熱処理とは慣用の条件で焼き入れ・焼
き戻しを行なうことをいう。また、比重11〜20の投
射材としては超硬合金を原料としたものを用いる。そし
て、投射材は、硬度が熱処理後の金型表面のそれの80
%より小さいとピーニング効果がなく、160%を越え
ると金型の表面粗さが粗くなり、さらに、粒子径が30
μmより小さいと処理効果が小さくなり、150μmを
越えると金型の表面粗さが粗くなる。また、投射材の投
射速度は、ピーニング処理するための一般的な速度であ
って、この速度が20m/sより小さいとピーニング効
果がなく、150m/sを越えると金型の表面粗さが粗
くなる。Here, the mold is a mold made of so-called mold steel, which is used for forging and pressing. Heat treatment refers to performing quenching and tempering under conventional conditions. Further, as a shot material having a specific gravity of 11 to 20, a shot material made of a cemented carbide is used. The shot material has a hardness of 80% of that of the mold surface after the heat treatment.
%, There is no peening effect, and if it exceeds 160%, the surface roughness of the mold becomes coarse, and further, the particle size becomes 30%.
If it is less than μm, the processing effect is small, and if it exceeds 150 μm, the surface roughness of the mold becomes rough. The projection speed of the blast material is a general speed for peening, and if this speed is less than 20 m / s, there is no peening effect, and if it exceeds 150 m / s, the surface roughness of the mold becomes rough. Become.
【0007】[0007]
【実施例】各種の金型用鋼を用いて製作した金型をそれ
ぞれ焼き入れ・焼き戻しの熱処理を行ない、その後、エ
ヤノズル(口径8mm)を用いかつ圧縮エヤの圧力を種
々変えて、それぞれの金型に粒子径と比重の相違する各
種投射材をそれぞれ投射した。引き続いて、こうしてピ
ーニング処理を行なった金型を用いて自動車部品の鍛造
を行なった場合、金型表面にいわゆるかじりが発生した
り、クラックが生じた時の自動車部品の製造個数を寿命
として表示したときの結果を、表1に示す。なお、表1
に示す評価値は同じ条件で試験を3回行なった結果の平
均値を示す。また、圧縮残留応力の最大値の位置に係る
数値は、X線回折応力測定装置のCrKα特性X線を用
いて圧縮残留応力を測定したとき金型表面からの深さ位
置を示す。EXAMPLE A mold manufactured by using various mold steels was subjected to a heat treatment of quenching and tempering, and thereafter, using an air nozzle (diameter: 8 mm) and changing the pressure of the compression air in various manners, each was used. Various blasting materials having different particle diameters and specific gravities were respectively projected onto a mold. Subsequently, when forging of an automobile part was performed using the mold subjected to the peening treatment in this manner, so-called galling occurred on the mold surface, and the number of manufactured automobile parts at the time of cracking was indicated as the life. Table 1 shows the results. Table 1
The evaluation values shown in Table 1 indicate the average values of the results of three tests performed under the same conditions. Further, the numerical value related to the position of the maximum value of the compressive residual stress indicates the depth position from the die surface when the compressive residual stress is measured using the CrKα characteristic X-ray of the X-ray diffraction stress measuring device.
【0008】表1Table 1
【0009】この表1において、摘要における比較例
は、この欄が一般的なピーニング処理の一つを行なった
ときのデータを示すことを意味する。また、摘要におけ
る未処理は、この欄がピーニング処理を行なわないこと
を意味する。さらに、摘要における1回目、2回目とは
同一の金型に対して投射材の比重、粒子径および硬度を
ぞれぞれ変えて二段階に亘りピーニング処理を行なった
ことを意味する(金型Bの場合)。In Table 1, the comparative example in the summary means that this column shows data when one of the general peening processes is performed. Unprocessed in the summary means that this field is not subjected to peening. Furthermore, the first and second times in the abstract means that peening treatment was performed in two stages on the same mold while changing the specific gravity, particle diameter, and hardness of the shot material (mold). B).
【0010】そして、表1から次のことが分かる。すな
わち、まず、金型をピーニング処理すると、金型の寿命
が延びるが、本願発明に示すような条件でピーニング処
理を行なうと、被処理面の表面粗さが極小になって金型
の寿命がさらに延びる。また、投射材については、第2
回目の処理の比重をより重く、粒子径をより小さく、か
つ、硬さをより硬くすることにより、または第1回目の
処理の比重をより重く、粒子径をより小さく、かつ、硬
さをより硬くすることにより、金型の寿命がさらに延び
る(金型Bの場合参照)。また、一般に使用されている
投射材の比重は、鉄の比重である7.8であるが、これ
よりも重くすることによっても金型の寿命がさらに延び
る(金型B〜Eの場合参照)。The following can be seen from Table 1. That is, first, when the mold is peened, the life of the mold is extended. However, when the peening treatment is performed under the conditions shown in the present invention, the surface roughness of the surface to be treated becomes extremely small, and the life of the mold is reduced. Extend further. In addition, about the projection material,
By making the specific gravity of the first treatment heavier, making the particle diameter smaller, and making the hardness harder, or making the specific gravity of the first treatment heavier, making the particle diameter smaller, and increasing the hardness, Hardening further extends the life of the mold (see mold B). The specific gravity of a commonly used projection material is 7.8, which is the specific gravity of iron. However, making it heavier than this also extends the life of the mold (see the cases of molds B to E). .
【0011】[0011]
【発明の効果】以上の説明から明らかなように請求項1
記載の発明は、熱処理した金型の表面に対して、硬度が
熱処理後の金型表面のビッカース硬度HVの80〜16
0%でありかつ粒子径が30〜150μmであるほぼ球
径の投射材を、速度20〜150m/sで投射するよう
にし、また、請求項2記載の発明は、熱処理した金型の
表面に対して、比重が11〜20でかつ粒子径が30〜
150μmであるほぼ球径の投射材を、速度20〜15
0m/sで投射するようにし、さらに、請求項3記載の
発明は、処理した金型の表面に対して複数回のピーニン
グ処理を行ない、この複数回のピーニング処理のうち少
なくとも1回のピーニング処理の投射材については、比
重をより重く、粒子径をより小さく、かつ、硬さをより
硬くしたから、それぞれ金型の表面粗さがRa1.0μ
m以下と非常に極小になり、また、圧縮残留応力の最大
値が金型表面に生成されることとなってピーニング処理
後の機械加工が不要になる。すなわち、本発明によれ
ば、金型表面の機械的性質を向上させることが可能にな
るなどの優れた効果を奏する。As is apparent from the above description, claim 1
The described invention has a hardness of 80 to 16 of the Vickers hardness HV of the heat-treated mold surface with respect to the heat-treated mold surface.
A projecting material having an approximate spherical diameter of 0% and a particle diameter of 30 to 150 μm is projected at a speed of 20 to 150 m / s, and the invention according to claim 2 is applied to the surface of a heat-treated mold. On the other hand, the specific gravity is 11 to 20 and the particle size is 30 to
A projectile having a substantially spherical diameter of 150 μm is applied at a speed of 20 to 15
The projection is performed at 0 m / s, and the invention according to claim 3 performs a plurality of peening processes on the surface of the processed mold, and at least one peening process among the plurality of peening processes. For the shot material, the specific gravity was larger, the particle size was smaller, and the hardness was harder, so that the surface roughness of each mold was Ra 1.0 μm.
m or less, and the maximum value of the compressive residual stress is generated on the mold surface, so that machining after the peening process is not required. That is, according to the present invention, an excellent effect is obtained such that the mechanical properties of the mold surface can be improved.
【図1】本発明方法と従来方法によりピーニング処理さ
れた金型表面の圧縮残留応力の分布状態を示すグラフで
ある。FIG. 1 is a graph showing a distribution state of compressive residual stress on a die surface peened by a method of the present invention and a conventional method.
【表1】 [Table 1]
───────────────────────────────────────────────────── フロントページの続き (72)発明者 高橋 徹 愛知県豊川市八幡町鐘鋳場126 (72)発明者 黒崎 順功 愛知県豊川市蔵子6丁目16番地の7 (72)発明者 伊藤 俊朗 愛知県豊川市諏訪3丁目123番地 (72)発明者 富樫 崇通 愛知県豊川市豊川町和通50の1 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tohru Takahashi 126, Yawatacho Bell Foundry, Toyokawa City, Aichi Prefecture (72) Inventor Junko Kurosaki 6-16-16 Kurako, Toyokawa City, Aichi Prefecture 7 (72) Inventor Toshiro Ito Aichi 3-123 Suwa, Toyokawa-shi, Aichi Prefecture (72) Inventor Takamichi Togashi 50-1, Wadotsu, Toyokawa-cho, Toyokawa-shi, Aichi
Claims (3)
理したときにこの処理面の表面粗さを極小にすることが
可能な方法であって、 熱処理した金型の表面に対して、硬度が熱処理後の金型
表面のビッカース硬度HVの80〜160%でありかつ
粒子径が30〜150μmであるほぼ球径の投射材を、
速度20〜150m/sで投射することを特徴とする金
型表面の処理方法。1. A method capable of minimizing the surface roughness of a heat-treated mold when the surface of the heat-treated mold is subjected to peening treatment, wherein the hardness of the surface of the heat-treated mold is reduced. A shot material having a substantially spherical diameter, which is 80 to 160% of the Vickers hardness HV of the mold surface after the heat treatment and has a particle diameter of 30 to 150 μm,
A method for treating a die surface, wherein the projection is performed at a speed of 20 to 150 m / s.
理したときにこの処理面の表面近傍に圧縮残留応力の最
大値を生成することが可能な方法であって、熱処理した
金型の表面に対して、比重11〜20、粒子径30〜1
50μmのほぼ球径の投射材を、速度20〜150m/
sで投射することを特徴とする金型表面の処理方法。2. A method capable of generating a maximum value of compressive residual stress in the vicinity of a surface of a heat-treated mold when the surface of the heat-treated mold is peened. On the other hand, specific gravity 11-20, particle diameter 30-1
A projecting material having a substantially spherical diameter of 50 μm is applied at a speed of 20 to 150 m /
A method for treating the surface of a mold, characterized by projecting in s.
理したときにこの処理面の表面近傍に圧縮残留応力の最
大値を生成することが可能な方法であって、熱処理した
金型の表面に対して複数回のピーニング処理を行ない、
この複数回のピーニング処理のうち少なくとも1回のピ
ーニング処理の投射材については、比重をより重く、粒
子径をより小さく、かつ、硬さをより硬くしたことを特
徴とする金型表面の処理方法。3. A method capable of generating a maximum value of compressive residual stress in the vicinity of a surface of a heat-treated mold when the surface of the heat-treated mold is peened. Perform peening multiple times for
A method for treating the surface of a mold, characterized in that the shot material of at least one of the plurality of peening treatments has a higher specific gravity, a smaller particle diameter, and a higher hardness. .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3331397A JPH10217122A (en) | 1997-01-31 | 1997-01-31 | Treatment method for metal mold surface |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3331397A JPH10217122A (en) | 1997-01-31 | 1997-01-31 | Treatment method for metal mold surface |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH10217122A true JPH10217122A (en) | 1998-08-18 |
Family
ID=12383076
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3331397A Pending JPH10217122A (en) | 1997-01-31 | 1997-01-31 | Treatment method for metal mold surface |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH10217122A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008223122A (en) * | 2007-03-15 | 2008-09-25 | Fuji Wpc:Kk | Method for strengthening alloy steel for hot-working die, and alloy steel of hot-working die for restraining generation of heat-fatigue crack with this method |
WO2011040243A1 (en) | 2009-09-30 | 2011-04-07 | 新東工業株式会社 | Shot peening treatment method for steel product |
JP2013220509A (en) * | 2012-04-17 | 2013-10-28 | Daido Steel Co Ltd | Shot peening method and gear material using the same |
JPWO2013099411A1 (en) * | 2011-12-26 | 2015-04-30 | 新東工業株式会社 | Shot processing method and shot processing apparatus |
WO2015145833A1 (en) * | 2014-03-24 | 2015-10-01 | 新東工業株式会社 | Surface characteristic inspection method and surface characteristic inspection device |
WO2017022328A1 (en) * | 2015-08-06 | 2017-02-09 | 新東工業株式会社 | Surface property inspection method and surface property inspection device for steel product |
CN116463483A (en) * | 2023-03-29 | 2023-07-21 | 宁波北仑博优模具技术有限公司 | Shot peening strengthening method for die casting die surface |
-
1997
- 1997-01-31 JP JP3331397A patent/JPH10217122A/en active Pending
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008223122A (en) * | 2007-03-15 | 2008-09-25 | Fuji Wpc:Kk | Method for strengthening alloy steel for hot-working die, and alloy steel of hot-working die for restraining generation of heat-fatigue crack with this method |
WO2011040243A1 (en) | 2009-09-30 | 2011-04-07 | 新東工業株式会社 | Shot peening treatment method for steel product |
US9056386B2 (en) | 2009-09-30 | 2015-06-16 | Sintokogio, Ltd. | Method of shot-peening treatment of steel product |
JPWO2013099411A1 (en) * | 2011-12-26 | 2015-04-30 | 新東工業株式会社 | Shot processing method and shot processing apparatus |
JP2013220509A (en) * | 2012-04-17 | 2013-10-28 | Daido Steel Co Ltd | Shot peening method and gear material using the same |
US10048227B2 (en) | 2014-03-24 | 2018-08-14 | Sintokogio, Ltd. | Surface property inspection method and apparatus |
WO2015145833A1 (en) * | 2014-03-24 | 2015-10-01 | 新東工業株式会社 | Surface characteristic inspection method and surface characteristic inspection device |
JPWO2015145833A1 (en) * | 2014-03-24 | 2017-04-13 | 新東工業株式会社 | Surface characteristic inspection method and surface characteristic inspection apparatus |
TWI645188B (en) * | 2014-03-24 | 2018-12-21 | 日商新東工業股份有限公司 | Surface characteristics inspection method and surface characteristics inspection apparatus |
WO2017022328A1 (en) * | 2015-08-06 | 2017-02-09 | 新東工業株式会社 | Surface property inspection method and surface property inspection device for steel product |
JPWO2017022328A1 (en) * | 2015-08-06 | 2018-06-07 | 新東工業株式会社 | Surface property inspection method and surface property inspection apparatus for steel products |
CN107923878A (en) * | 2015-08-06 | 2018-04-17 | 新东工业株式会社 | The surface characteristic inspection method and surface characteristic check device of steel product |
US10718739B2 (en) | 2015-08-06 | 2020-07-21 | Sintokogio, Ltd. | Surface characteristics inspection method and surface characteristics inspection apparatus for steel product |
CN116463483A (en) * | 2023-03-29 | 2023-07-21 | 宁波北仑博优模具技术有限公司 | Shot peening strengthening method for die casting die surface |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US9464335B2 (en) | Method for improving fatigue strength of cast iron material | |
JP4775525B2 (en) | Shot peening treatment method for steel products | |
JPH1029160A (en) | Highly hard metal product shot peening method and highly hard metal product | |
KR101482619B1 (en) | Method for manufacturing blasting material for shot-peening | |
JP6391780B2 (en) | Surface treatment method for cavitation erosion resistance | |
JP2002036115A (en) | Shot peening processing method and processed article thereof | |
JPH10217122A (en) | Treatment method for metal mold surface | |
EP1944124A1 (en) | Shot- peening process | |
JP3227492B2 (en) | Spring shot peening method and spring product | |
JPH07276242A (en) | Manufacture of iron-series shot grain | |
JP3830119B2 (en) | Cut-wire iron shot for blasting | |
JPH10100069A (en) | Shot peening method and treated article | |
JP2001079766A (en) | Projection material for shot peening | |
JP2003253422A (en) | Method for prolonging service life of tool such as mandrel and forming die, and tool of prolonged service life such as mandrel and forming die | |
JP3028624B2 (en) | How to strengthen carburized parts | |
JP4131384B2 (en) | Shot peening method | |
JP2003191166A (en) | Method for improving metal mold serviceable life and metal mold | |
JP4131389B2 (en) | Shot peening method | |
US6474135B1 (en) | Laser peening to provide design credit for improved fatigue properties | |
JPS63256362A (en) | Shot peening | |
JP2014213441A (en) | Shot-peening method obtaining high compressive residual stress | |
JPS6284974A (en) | Method of highly strengthening outer surface of metal | |
JPH0413573A (en) | Finishing method for surface of metal product | |
JP2009091631A (en) | Precipitation hardening type aluminum alloy casting | |
JPH04176563A (en) | Shot peening method for titanium alloy |