Tool Life and Tool Quality in Bulk Metal Forming

Lange, Kurt; Cser, L.; Geiger, Manfred; Kals, J.A.G.

doi:10.1016/s0007-8506(07)63253-3

Cited by 121 publications

(59 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The centre of the system is the forging process that enables to shape the workpiece of simple initial shape into final product of complex shape and accurate dimensions next to good surface conditions. Response of the system is desired system function or the product of desired geometry and dimensional accuracy, respectively, the tool life, etc [1,2]. It must be emphasized that parameters of random and systematic deviations enter the forging process, and they consequently cause deviations of the product dimensional accuracy and of the tool life, and thus they cause the unreliability of process [3,4].…”

Section: Introductionmentioning

confidence: 99%

Reliability of system for precise cold forging

Krušič

Rodič

2017

Materials and Geoenvironment

View full text Add to dashboard Cite

The influence of scatter of principal input parameters of the forging system on the dimensional accuracy of product and on the tool life for closed-die forging process is presented in this paper. Scatter of the essential input parameters for the closed-die upsetting process was adjusted to the maximal values that enabled the reliable production of a dimensionally accurate product at optimal tool life. An operating window was created in which exists the maximal scatter of principal input parameters for the closed-die upsetting process that still ensures the desired dimensional accuracy of the product and the optimal tool life. Application of the adjustment of the process input parameters is shown on the example of making an inner race of homokinetic joint from mass production. High productivity in manufacture of elements by cold massive extrusion is often achieved by multiple forming operations that are performed simultaneously on the same press. By redesigning the time sequences of forming operations at multistage forming process of starter barrel during the working stroke the course of the resultant force is optimized.Key words: cold foring, process reliability, product accuracy, tool life, FE simulation PovzetekPrispevek podaja vpliv raztrosa glavnih vhodnih parametrov preoblikovanega sistema na natančnost izdelka in vzdržljivost orodja pri hladnem preoblikovanju v zaprti matrici. Za postopek nakrčevanja v zaprti matrici je bila izvedena prilagoditev glavnih parametrov procesa na maksimalne vrednosti, ki zagotavljajo zanesljivo proizvodnjo preciznega izdelka in optimalno vzdržljivost orodja. Kreirano je bilo operacijsko okno z maksimalnim raztrosom vhodnih parametrov za postopek nakrčevanja v zaprti matrici, ki zagotavlja žele-no natančnost izdelka in optimalno vzdržljivost orodja. Prilagoditev vhodnih parametrov je prikazana na izdelavi kroglaste glave homokinetičnega zgloba v masovni proizvodnji. Visoko produktivnost izdelkov lahko dosežemo z več stopenjskim preoblikovanjem na isti stiskalnici. Z rekonstrukcijo časovnega zaporedja poteka preoblikovalnih operacij pri večstopenjskem preoblikovanju pesta zaganjalnika lahko izvedemo optimizacijo poteka rezultante sil.Ključne besede: hladno preoblikovanje, zanesljivost procesov, natančnost izdelka, vzdržljivost orodij, simulacija z MKE

show abstract

Section: Introductionmentioning

confidence: 99%

Reliability of system for precise cold forging

Krušič

Rodič

2017

Materials and Geoenvironment

View full text Add to dashboard Cite

show abstract

“…The service life of hot-working tools is greatly shorter than that of the cold-working tools due to the severe wear of the hot-working tools [1]. The premature wear of hotworking tools is induced by the thermal softening of the tool surface and the local bonding of the workpiece to the tool surface [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…The premature wear of hotworking tools is induced by the thermal softening of the tool surface and the local bonding of the workpiece to the tool surface [1][2][3]. The main cause of the thermal softening and the local bonding is the heat transfer from the hot workpiece to the tool surface [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

A study on the Effects of Geometrical Parameters of Overlay Coated Layer on the Thermal Stress-strain Distributions of Co-based Super-alloy Deposited Layer on Hot-working Tool Steel

Guk

Lee

Ahn

2016

MATEC Web of Conferences

View full text Add to dashboard Cite

Abstract.Interests in an overlay coating technology, so called hardfacing technology, have steadily increased to improve the service life of hot-working tools through the reduction of the wear of tool surfaces. Characteristics of the overlay coated layer are dependent on geometrical parameters and material properties of sub-layers. The aims of the paper is to examine the effects of geometrical parameters of the overlay coated layer on thermal stress-strain distributions of Co-based super-alloy deposited layer on hot-working tool steel using finite element analysis (FEA). The overlay coated layer is designed as two sub-layers including the wear resistance layer with Co-based super-alloy and the thermal stress control layer (TSCL). The material of the TSCL is composed of 50 % of Co-based super-alloy and 50 % of hot-working tool steel. The protruded height and the inclined angle are chosen as geometrical parameters. The influence of the protruded height and the inclined angle on thermal stress-strain distributions in the vicinity of the overlay coated layer and the strain deviation in joined regions is quantitatively investigated. From the results of the investigation, an appropriate design methodology of the overlay coated layer is discussed.

show abstract

“…In a hot forging process, complex loading conditions often lead to several types of die failures such as wear, plastic deformation, fatigue, etc., among which wear accounts for 70% of all the hot-forging die failures [1]. The lifespan of hot forging dies is one of the most important concerns in hot forging.…”

Section: Introductionmentioning

confidence: 99%

Effect of post-welding heat treatment on wear resistance of cast-steel die with surfacing layer

Tang

et al. 2015

Manufacturing Rev.

View full text Add to dashboard Cite

-The wear resistance capability of die surfacing layer under different Post-Welding Heat Treatments (PWHT) was analysed by Finite Element (FE) simulation and experiments. Taking hot forging process of a crankshaft as an example, a wear model of the hot forging die coated with surfacing layer was established using FE software DEFORM-3D. The simulation results indicated that the wear resistance capability of the die surfacing layer is optimal when tempering temperature and holding time are 550°C and 4 h respectively. To verify the wear computational results, 16 groups of PWHT orthogonal wear tests were performed at a temperature of 400°C, which is a similar temperature to that occurs in an actual hot forging die. The wear-test result showed a good agreement with the FE simulation. SEM observation of the wear debris on 16 specimens showed that oxidative wear is dominant when the temperature was in 400°C. Furthermore, when tempering temperature and holding time were 550°C and 4 h respectively, the carbide alloy dispersively distributes in the metallographic structure, which helps to improve the wear resistance of the surfacing layer.

show abstract

Tool Life and Tool Quality in Bulk Metal Forming

Cited by 121 publications

References 18 publications

Reliability of system for precise cold forging

Reliability of system for precise cold forging

A study on the Effects of Geometrical Parameters of Overlay Coated Layer on the Thermal Stress-strain Distributions of Co-based Super-alloy Deposited Layer on Hot-working Tool Steel

Effect of post-welding heat treatment on wear resistance of cast-steel die with surfacing layer

Contact Info

Product

Resources

About