EP1726380A1 - Procédé de prediction de la durée de vie d'une matrice - Google Patents

Procédé de prediction de la durée de vie d'une matrice Download PDF

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Publication number
EP1726380A1
EP1726380A1 EP06010678A EP06010678A EP1726380A1 EP 1726380 A1 EP1726380 A1 EP 1726380A1 EP 06010678 A EP06010678 A EP 06010678A EP 06010678 A EP06010678 A EP 06010678A EP 1726380 A1 EP1726380 A1 EP 1726380A1
Authority
EP
European Patent Office
Prior art keywords
die
stress
low cycle
damage
predicting
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.)
Withdrawn
Application number
EP06010678A
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German (de)
English (en)
Inventor
Hiroaki Yoshida
Shigekazu Itoh
Takuma Okajima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daido Steel Co Ltd
Original Assignee
Daido Steel Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Daido Steel Co Ltd filed Critical Daido Steel Co Ltd
Publication of EP1726380A1 publication Critical patent/EP1726380A1/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B21J13/02—Dies or mountings therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor

Definitions

  • the present invention concerns a method of predicting die lives. More specifically, the invention concerns predicting lives of dies for plastic processing of metals, typically, forging dies, by presuming low cycle fatigue lives, and utilizing the results for die design including choice of materials, hardness thereof and determining the die configuration so as to establish countermeasures for prolongation of the die lives.
  • low cycle life One of the main factors causing damage and shortening of life of a forging die during using is low cycle fatigue fracture life (hereinafter referred to as "low cycle life").
  • the inventors intended to expedite the matter and noted the fact that the cause of the low cycle fatigue fracture is accumulation of strain. They succeeded in establishing a method of predicting die lives by presuming accumulated strain with a yield condition formula, in which direction of the stress posed on the die is considered, and by working out a regression formula from a low cycle fatigue curve.
  • the object of the present invention is to provide a method of predicting die lives enabling design of improved dies by predicting low cycle fatigue life of dies, which give important influence to die lives.
  • the method according to the invention achieving the above-mentioned object is a method of presuming the low cycle fatigue life properties influencing the lives of dies for plastic processing of metals to contribute to die design including choice of materials, hardness and configuration of the die.
  • D c ⁇ eq / Y S ⁇ softening rate instead of the strain, which was considered important in the known Manson-Coffin's formula.
  • ⁇ eq is the above-mentioned Von Misese's equivalent stress
  • YS is yield stress (including both tensile and compressive)
  • Dc is a criteria (critical value) of plastic flow. When the value of Dc goes up to 1.0, the plastic flow of the die will begin.
  • the above-mentioned damage stress, ⁇ damage is the idea introduced on the basis of the understanding that the strain occurs not only at the moment of tensile stress but also at the moment of compressive stress in view of the low cycle fatigue test and the results of stress component calculation at one shot, in other words, the above idea of damage stress resulted from the discussion in which the stress posed on the die during forging is analyzed to the tensile stress and the compressive stress.
  • the above formula of Dc fatigue was introduced.
  • the above formula of FL is of this kind.
  • the final goal is to predict damage of dies by computer simulation using indices such as the FL value and the Dc value and to find the optimum values concerning shapes and using conditions (such as forging temperature and the extent of cooling.)
  • Typical steel-marks suitable for die material are the following two. It is recommended to use them with heat treatment to the hardness shown in the parentheses.
  • the die enjoys a longer life, the contribution will be not only to decrease in die-manufacturing costs but also to decrease manufacturing costs of processed parts such as forged parts through reduction in time and labor for exchanging the dies
  • the punch as shown in Fig. 6 (in this case, without consideration of stress direction, tensile only) was used and the cooling conditions were controlled to strong and weak by adjusting flow rates of the forging oil.
  • the results of simulation are as shown in Fig. 6A (weak cooling) and 6B (strong cooling), from which it is concluded that cooling should be strong.
  • the punch was cut along the axis thereof to observe the texture.
  • weak cooling there was observed plastic flow at the part "R" of the tip of the punch. (This was so judged from the fact that the stripes made by corrosion curved at the surface.)
  • no sign of the plastic flow was observed in case of strong cooling.
  • Comparison of the Dc values in the cases of weak and strong cooling the Dc value of the weak cooling was higher at the tip of the punch.
  • the results of analysis indicates that, even if the forging temperature is the same, it is preferable to enhance cooling (oil cooling ⁇ water cooling) for the die lives, and that, even if the forging temperature is high, the die lives may be prolonged by enhancing the cooling.
  • the results of computer simulation according to the invention and the results of observation of the used punches are in good concordance, and thus, it is concluded that the present invention provides a method of prediction with high liability.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
EP06010678A 2005-05-23 2006-05-23 Procédé de prediction de la durée de vie d'une matrice Withdrawn EP1726380A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005150266A JP2006326606A (ja) 2005-05-23 2005-05-23 金型寿命の予測方法

Publications (1)

Publication Number Publication Date
EP1726380A1 true EP1726380A1 (fr) 2006-11-29

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EP06010678A Withdrawn EP1726380A1 (fr) 2005-05-23 2006-05-23 Procédé de prediction de la durée de vie d'une matrice

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US (1) US20060260722A1 (fr)
EP (1) EP1726380A1 (fr)
JP (1) JP2006326606A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108920871A (zh) * 2018-07-26 2018-11-30 西北有色金属研究院 物理实验与数值模拟相结合预测金属挤压成形开裂的方法
CN109885920A (zh) * 2019-02-13 2019-06-14 西安电子科技大学 一种航空发动机涡轮叶片的高低周复合疲劳寿命预测方法
CN111721647A (zh) * 2020-06-24 2020-09-29 四川大学 一种低周疲劳测试数据处理与内应力评估方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4556753B2 (ja) * 2005-04-19 2010-10-06 大同特殊鋼株式会社 金型の損傷予測方法
KR101308048B1 (ko) * 2007-10-10 2013-09-12 삼성전자주식회사 반도체 메모리 장치
JP4893585B2 (ja) * 2007-10-31 2012-03-07 日本精工株式会社 車輪支持用転がり軸受ユニットの製造方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10175037A (ja) * 1996-12-13 1998-06-30 Hitachi Metals Ltd 金型寿命の予測方法及びそれを用いた金型材の最適物性値の予測方法
JP2002035885A (ja) * 2000-07-20 2002-02-05 Toyota Motor Corp 鍛造型の損傷形態予測方法
US20030222871A1 (en) * 2002-05-31 2003-12-04 Electronic Data Systems Corporation; Computerized deformation analyzer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10175037A (ja) * 1996-12-13 1998-06-30 Hitachi Metals Ltd 金型寿命の予測方法及びそれを用いた金型材の最適物性値の予測方法
JP2002035885A (ja) * 2000-07-20 2002-02-05 Toyota Motor Corp 鍛造型の損傷形態予測方法
US20030222871A1 (en) * 2002-05-31 2003-12-04 Electronic Data Systems Corporation; Computerized deformation analyzer

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
MEIDERT ET AL.: "Proceedings of the 6th International tooling Conference", 13 September 2002, KARLSTADS UNIVERSITEIT, KARLSTAD, SE, XP002392382 *
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 11 30 September 1998 (1998-09-30) *
PATENT ABSTRACTS OF JAPAN vol. 2002, no. 06 4 June 2002 (2002-06-04) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108920871A (zh) * 2018-07-26 2018-11-30 西北有色金属研究院 物理实验与数值模拟相结合预测金属挤压成形开裂的方法
CN109885920A (zh) * 2019-02-13 2019-06-14 西安电子科技大学 一种航空发动机涡轮叶片的高低周复合疲劳寿命预测方法
CN109885920B (zh) * 2019-02-13 2020-09-08 西安电子科技大学 一种航空发动机涡轮叶片的高低周复合疲劳寿命预测方法
CN111721647A (zh) * 2020-06-24 2020-09-29 四川大学 一种低周疲劳测试数据处理与内应力评估方法
CN111721647B (zh) * 2020-06-24 2021-12-28 四川大学 一种低周疲劳测试数据处理与内应力评估方法

Also Published As

Publication number Publication date
US20060260722A1 (en) 2006-11-23
JP2006326606A (ja) 2006-12-07

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