Design of a Tribo-Simulator for Investigation of the Tribological Behavior of Stainless-Steel Sheets Under Different Contact Conditions

Luiz, Valmir Dias; Rodrigues, Paulo César de Matos

doi:10.1590/1980-5373-mr-2021-0220

Cited by 8 publications

(6 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The friction tests simulating the contact conditions in the region of the die radius and punch in the deep drawing processes (Figure 3a) are illustrated in Figure 3b and Figure 3c, respectively. The contact condition illustrated in Figure 3b (BUT test) consists of bending and sliding a strip (t) around the radius (R) of the bending pin, thus simulating the contact condition between die/sheet in SMF processes [15]. In this test, a force is applied at one end of the strip (frontal force 𝐹 1 ) to cause a movement relative to the bending pin, whereas at the other end of the strip, a force opposite to the movement (back force 𝐹 1 ) is applied to submit it to the effect of stretching [22].…”

Section: Formability Testsmentioning

confidence: 99%

“…Recently, Trzepiecinski and Lemu [4] presented a review of the methods used to describe friction conditions in conventional SMF developments over the years. According to the authors, several friction tests have been used to simulate the friction phenomena in specific regions of SMF processes, for example, the strip-tension test (STT; sliding of the strip in the region of the punch radius) [8], bending under tension test (BUT) (sliding of the strip in the region of the die radius) [15], draw-bead test (DBT) [16,17], and strip drawing test (SDT) [14]. Bay et al [18] divided friction tests used in SMF processes with respect to the sliding length, surface expansion, and normal pressure value into three groups.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Different Contact Conditions on Friction Properties of AISI 430 Steel Sheet with Deep Drawing Quality

et al. 2023

Self Cite

View full text Add to dashboard Cite

This article aims to investigate the influence of different contact conditions on the friction properties of an Nb-stabilized AISI 430 ferritic stainless-steel sheet with deep drawing quality. Three tribological tests were performed: pin-on-disk, bending under tension, and strip-tension test. Moreover, counter samples of a hard metal (WC-12%Co) with surface finishes of 0.27 and 0.54 µm were used in the friction tests under dry and lubricated conditions. The influence of the texture and relative elongation of the strip on formability also were investigated. A comparative analysis of the results revealed that the coefficients of friction, wear, lubricant efficiency, and hardness measured below the wear surface indicated a strong dependence on surface roughness and the friction test type. The coefficients of friction obtained from the pin-on-disk test were higher than those obtained from the formability tests. In addition, the coefficient of friction increased with increasing relative elongation during the formability tests; it was higher in the bending-under-tension test than in the strip-tension test, mainly owing to the increasing strip surface roughness. The contact pressure during the formability tests was non-uniform during strip sliding under the tool. According to our results, for each friction condition in a specific area of the forming die, there is a value of the coefficient of friction, depending on the kinematic conditions. Therefore, the results can be used as input data to define design guidelines, improve productivity, and improve product quality from this steel sheet.

show abstract

Section: Formability Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Different Contact Conditions on Friction Properties of AISI 430 Steel Sheet with Deep Drawing Quality

et al. 2023

Self Cite

View full text Add to dashboard Cite

show abstract

“…The purpose of using a lubricant is to reduce the intensity of wear between the pair of rubbing bodies, leading to an increase in the durability of the tools [68,69]. In cold forming processes, in which the material is subject to large deformations, high sliding speeds and intense heat generation, the grease is also responsible for cooling the tools.…”

Section: Lubricationmentioning

confidence: 99%

Approaches for Preventing Tool Wear in Sheet Metal Forming Processes

Trzepieciński

2023

Machines

View full text Add to dashboard Cite

Sheet metal forming processes, the purpose of which is to give the shaped material appropriate mechanical, dimensional and shape properties, are characterised by different values of unit pressures and lubrication conditions. Increasing the efficiency of tool work by increasing their durability, efficiency and reliability is still one of the main indicators of increasing production efficiency. Tool wear in metal forming technologies significantly differs from the character of wear in other methods of metalworking, such as machining. This article presents the characteristics of tool wear mechanisms used in sheet metal forming. Possibilities of increasing the durability of tools by applying coatings produced by laser techniques, chemical vapour deposition and chemical vapour deposition are also discussed. Great emphasis is placed on self-lubricating and functional materials and coatings. Current trends in lubricants and lubrication methods in sheet forming, including tool texturing, are also presented.

show abstract

“…Figure 3c shows that the DBF test is based on the operating principle of the BUT test, wherein four components of forces are assumed during the sliding of the sheet under the bending pin's radius of curvature. Several authors [24,30,31] have explained that the force required to pull the strip (𝐹 1 ) around the radius must overcome the three basic forces shown in the balance of the total forces shown in Eq. 1.…”

Section: Constitutive Equations and Fractured Samples Analysismentioning

confidence: 99%

Failure analysis of AISI 430 stainless-steel sheet under stretching and bending conditions

Luiz

Rodrigues²

2022

Preprint

Self Cite

View full text Add to dashboard Cite

Ferritic stainless steels have been widely used to substitute austenitic steels because of their lower cost and higher deep drawing capacity. However, failures, such as shear fracture, have been observed in parts with small radii during the drawing process in applications where both bending and stretching occurs. Conventional techniques, such as failure criterion consideration, finite element method, and forming limit diagram, are unable to predict this type of fracture, which has hampered the development of new processes and products. To overcome this limitation, herein, we investigated the effects of tool radius, direction, and test speed on the formability to fracture of an AISI 430 stainless-steel sheet under bending and stretching conditions. An equipment was used to perform the draw-bend fracture (DBF) test based on the bending under tension test. The DBF test efficiently reproduced the tensile, mixed, and shear fractures. Furthermore, we determined the fracture limit strain on the outer surface, thickness, and sidewall of the sample, as well as the coefficient of friction. The data showed that the radius to thickness ratio related to the process parameters had a direct impact on the experimental results. In addition, the results can be utilized for setting design guidelines and failure prevention.

show abstract

Design of a Tribo-Simulator for Investigation of the Tribological Behavior of Stainless-Steel Sheets Under Different Contact Conditions

Cited by 8 publications

References 40 publications

Influence of Different Contact Conditions on Friction Properties of AISI 430 Steel Sheet with Deep Drawing Quality

Influence of Different Contact Conditions on Friction Properties of AISI 430 Steel Sheet with Deep Drawing Quality

Approaches for Preventing Tool Wear in Sheet Metal Forming Processes

Failure analysis of AISI 430 stainless-steel sheet under stretching and bending conditions

Contact Info

Product

Resources

About