Effect of the surface structure on the resistance to plastic deformation of a hot forging tool

Saiki, Hiroshi; Marumo, Yasuo; Minami, Akihiro; Sonoi, Takehiko

doi:10.1016/s0924-0136(01)00632-x

Cited by 49 publications

(28 citation statements)

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“…After 1,000 forging cycles no differences among the tested variants are discernible. Occuring wear mechanisms are adhesion (4), plastic deformation (5), abrasion (6) as well as chipping (7).…”

Section: Visual Inspection and Tactile Contour Measurementmentioning

confidence: 99%

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Deposition welding of hot forging dies using nanoparticle reinforced weld metal

Behrens

Yilkiran

Ocylok

et al. 2014

Prod. Eng. Res. Devel.

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In the application field of forging, the form-giving tool components are subject to process-related severe environmental conditions, such as high mechanical loads acting simultaneously with high tribological and thermal charges. Due to high machine hour rates as well as increasing environmental requirements in terms of energy consumption, wear protection methods and suitable repair measures for forging tools become more and more important. Laser deposition welding represents an established process for the repair of complex shaped surfaces. A new approach is the addition of nano-sized ceramic particles to improve the mechanical properties. The main idea is to reduce the grain size of the cladded layers by adding nano-sized nuclei. A fine grained microstructure will improve strength as well as ductility and fatigue resistance. Furthermore small hard particles can improve the wear resistance without affecting the friction of the surface. After the cladding process the surface has to be finished usually by turning, milling and grinding operations. Within the presented paper the potential of nanoparticle-reinforced deposition welding with regard to increasing the wear resistance of forging dies will be examined. First, the process of nanoparticle-reinforced deposition welding will be presented. Afterwards it will be shown that yttrium oxide, titanium carbide and tungsten carbide nanoparticles in an AISI H10 matrix material will influence the friction coefficient between forging tool and material as well as the wear properties

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Section: Visual Inspection and Tactile Contour Measurementmentioning

confidence: 99%

“…The resistance of forging dies against plastic deformation is decreased by thermal softening processes due to high process temperatures. This mechanism generally occurs at corner regions due to high thermal loads combined with strong slipping of material [7].…”

Section: Introductionmentioning

confidence: 99%

Deposition welding of hot forging dies using nanoparticle reinforced weld metal

Behrens

Yilkiran

Ocylok

et al. 2014

Prod. Eng. Res. Devel.

View full text Add to dashboard Cite

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“…The rate of temperature rise can be attributed to several factors, such as the initial temperatures of the dies and billet, contact time and pressure, and the lubricant and surface treatment. Thermal softening effects induced by this temperature rise gradually and reduce die hardness, eventually causing plastic deformation [9][10][11].…”

Section: Die Service Life Based On Plastic Deformationmentioning

confidence: 99%

Estimation of die service life for a die cooling method in a hot forging process

Kim

Kang

2005

Int J Adv Manuf Technol

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Dies may have to be replaced for a number of reasons, such as changes in dimensions due to wear or plastic deformation, deterioration of the surface finish, breakdown of lubrication, and cracking or breakage. In this paper, die cooling methods are suggested to improve die service life with regards to wear and plastic deformation in a hot forging process. The yield strength of die decreases at higher temperatures and is dependent on hardness. Also, to evaluate die life due to wear, a modified Archard's wear model has been proposed by considering the thermal softening of die expressed in terms of the main tempering curve. This paper describes the effects of die cooling methods such as cooling hole and direct spray cooling on the life of finisher die during the hot forging of an automobile part. It is shown that the cooling hole method during hot forging is necessary for an effective die service life to be obtained.

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“…The surface hardness of a die decreases during the repeated operations, which induces thermal softening of hot forging tools. This thermal softening decreases resistance to wear or plastic deformation [1][2][3].…”

Section: Introductionmentioning

confidence: 99%