Improving the tribological characteristics of tool and mould surfaces by machine hammer peening

Bleicher, Friedrich; Lechner, Christoph; Habersohn, Christoph; Obermair, Martin; Heindl, Franz; Ripoll, Manel Rodríguez

doi:10.1016/j.cirp.2013.03.043

Cited by 31 publications

(9 citation statements)

References 6 publications

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“…Taking into account the result of the hardness measurements of the treated surface, the improvement is as high as 47 percent. The achieved surface hardness as well as the surface roughness is strongly affected by the stroke h and the impact angle βi of the tool tip [12]. Table 4.…”

Section: Resultsmentioning

confidence: 99%

Robot based machine hammer peening using an electromagnetic driven hammering device

Krall¹,

Lechner²,

Nirtl³

et al. 2016

DAAAM Proceedings

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The usability of a component and in particular its functional performance is highly dependent on the properties of its surface and subsurface region. Machine hammer peening is a manufacturing process for the mechanical surface treatment of workpieces, with the aim to induce compressive residual stresses in near surface layers. This comes along with strain hardening effects and increased surface hardness of the edge layer. By the use of adequate process parameters, it is even possible to modify the surface topography. In order to implement machine hammer peening processes, NC-guided machine tools have to be used to generate single deterministic tool contact marks. In the course of this work an electromagnetic actuator system will be implemented on a 6-axes industrial robot KUKA KR30-3 and the static and dynamic behaviour of the robot during the hammer peening process will be investigated in order to evaluate the applicability to generate deterministic patterns.

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Section: Resultsmentioning

confidence: 99%

Robot based machine hammer peening using an electromagnetic driven hammering device

Krall¹,

Lechner²,

Nirtl³

et al. 2016

DAAAM Proceedings

Self Cite

View full text Add to dashboard Cite

show abstract

“…Therefore, it is used in this research work. Bleicher et al [9] investigated the basic mechanism of surface modifications with regard to strain hardening and residual stresses as well as analyzed tribological characteristics of tool and mold surfaces after MHP [10]. Ripoll et al [11] continued this research and investigated the possibility to improve the wear resistance of functional surfaces by embedding hard particles into the surface.…”

Section: Initial Situationmentioning

confidence: 99%

Analysis of the Velocity Distribution of an Elliptic Surface Structure Manufactured by Machine Hammer Peening

et al. 2015

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Machine hammer peening (MHP) is an incremental forming process for surface structuring of technical workpieces or tools. Currently, MHP strongly attracts the attention of automotive and toolmaking industry. Recently performed research showed improved tribological characteristics in lubricated deep drawing in terms of a reduced friction coefficient due to a lubricant pocket effect and a reduced contact area. In order to design the MHP process to obtain an optimized load capacity of the fluid film, the velocity distribution has to be analyzed. Thus, an analytic approach for solving the Reynolds equation as a valid simplification of the Navier-Stokes equations for an elliptic geometry of a MHP structure is proposed in this work. The research assumes stationary hydrodynamic lubrication and is restricted to the longitudinal properties. Thereby, the influence of the structure geometry, the fluid film thickness, the sliding velocity and the dynamic viscosity on the fluid velocity distribution is researched by means of an analytic solution of the Reynolds equation. The derived formula is applied to contribute to the understanding in lubricated deep drawing with MHP structures, but is also transferable on further sliding contacts, e.g. bearing lubrication.

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“…For example, one study [16] describes piezoelectric machine hammer tools with impact frequencies up to 700 Hz. The workpiece is routed with the tool in multiple lines, generating a geometrically defined area with multiple impacts [17]. It also enables an increase in hardness and the introduction of residual compressive stresses.…”

Section: Introductionmentioning

confidence: 99%

“…Common finishing processes and their influence on surface and subsurface properties (cf. e.g., [1,4,17].). Nevertheless, none of the processes presented here is suitable to generate a designated specific functional surface structure and induce compressive residual stresses in the subsurface layer while maintaining a constant tool-workpiece contact.…”

Section: Introductionmentioning

confidence: 99%

Pulsed Mechanical Surface Treatment—An Approach to Combine the Advantages of Shot Peening, Deep Rolling, and Machine Hammer Peening

Meyer

Hettig

Mensching

2021

JMMP

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Several manufacturing processes are used to beneficially influence the surface and subsurface properties of manufactured parts. Different aspects such as the surface topography or resulting residual stresses are addressed using different manufacturing processes. This paper presents the first approach for pulsed mechanical surface treatment (PMST), a new manufacturing process aiming to combine the mechanics used in deep rolling and shot or hammer peening. The process can generate a defined surface topography while constantly impinging a mechanical impact on the workpiece. Two different tools (type 1 and type 2) have been designed to approach this new concept. Hardened carbide pins are used for type 1 to prove the concept using a simpler kinematic and resulting in a burnishing-like process. For type 2, hardened roller is used and results in an actual rolling process. Specimens made of S235 are processed in experiments with tool type 1 with varying pulse frequency and feeds. The resulting surface topography is described using optical measurement systems while micro-hardness measurements are used to describe the subsurface properties. The results in general show an increase of hardness in the surface and subsurface layer while the resulting surface topography can be directly controlled by the process parameters and therefore be designed for specific functional properties.

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Improving the tribological characteristics of tool and mould surfaces by machine hammer peening

Cited by 31 publications

References 6 publications

Robot based machine hammer peening using an electromagnetic driven hammering device

Robot based machine hammer peening using an electromagnetic driven hammering device

Analysis of the Velocity Distribution of an Elliptic Surface Structure Manufactured by Machine Hammer Peening

Pulsed Mechanical Surface Treatment—An Approach to Combine the Advantages of Shot Peening, Deep Rolling, and Machine Hammer Peening

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