Cooling Systems Based on Cold Compressed Air: A Review of the Applications in Machining Processes

Rubio, E.; Agustina, Beatriz de; Marín, Marta María; Bericua, Alfonso

doi:10.1016/j.proeng.2015.12.513

Cited by 37 publications

(15 citation statements)

References 21 publications

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“…Therefore, when magnesium-containing hybrid components are going to be mechanized, it is necessary to take certain security measures regarding the lubricants or coolant systems employed. Depending on the material or materials with which magnesium is combined, different lubrication/cooling techniques can be used [17,18] both individually (dry machining [19][20][21][22][23][24][25][26][27][28][29][30][31], minimum quantity lubrication (MQL) [30][31][32][33][34][35][36][37][38][39][40][41][42], solid lubrication [43][44][45][46][47], cryogenic cooling [48][49][50][51][52][53][54][55], gaseous cooling [56][57][58][59][60][61], nanofluids …”

Section: Introductionmentioning

confidence: 99%

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Repairing Hybrid Mg–Al–Mg Components Using Sustainable Cooling Systems

et al. 2020

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This paper focused on the maintenance or repair of holes made using hybrid Mg–Al–Mg components by drilling, using two sustainable cooling techniques (dry machining and cold compressed air) and taking surface roughness on the inside of the holes as the response variable. The novelty of the work is in proving that the repair operations of the multi-material components (magnesium–aluminum–magnesium) and the parts made of aluminum and magnesium (separately) but assembled to form a higher component can be done simultaneously, thus reducing the time and cost of the assembly and disassembly of this type of component. The study is based on a design of experiments (DOE) defined as a product of a full factorial 23 and a block of two factors (3 × 2). Based on our findings, we propose that the analyzed operations are feasible under sustainable conditions and, in particular, under dry machining. Also, the results depend on the machining order.

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Section: Introductionmentioning

confidence: 99%

“…Chemical composition of the materials used for the manufacturing specimens.These materials were selected because the authors had previous experience in their machining, both independently[12][13][14][16][17][18][19][20][21][22][23]25,[28][29][30][31][32][77][78][79][82][83][84][85][86][87][88][89][90][91][92][93][94] and together…”

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confidence: 99%

Repairing Hybrid Mg–Al–Mg Components Using Sustainable Cooling Systems

et al. 2020

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“…In recent years, other important aspects were also considered, such as health care of operators, environment, and the cost of liquids, which is between 7.5% and 17% of the cost of a machining part [3]. The present trend is to use alternative techniques, such as dry machining [4], electrocutting [5], cryogenic [6], cold compressed air [7], or minimum quantity of lubricant (MQL) [8], with the aim to reduce environmental impacts.…”

Section: Introductionmentioning

confidence: 99%

Wear and MnS Layer Adhesion in Uncoated Cutting Tools When Dry and Wet Turning Free-Cutting Steels

Krähmer

Hameed

Egea

et al. 2019

Metals

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Free-cutting steels are developed to produce large quantities of parts with low mechanical behavior, mainly for automotive sector. These alloys contain phosphorous, lead, sulfur, and manganese that help to improve the machinability and surface roughness. However, due to the toxicity of lead, steel mills in recent years have been focusing on non-toxic steels to produce minimum environmental pollution and better machinability. The present work investigates the tool wear during dry and wet turning of free-cutting steels (SAE 1212, SAE 12L14, and SAE 1215) by using uncoated hard metal inserts at three cutting speeds. Additionally, a EDS analysis was performed to determine the presence of Mn and S elements at the rake face of the cutting tool that can induce a higher adhesion of manganese sulfide (MnS). The results show that the SAE 12L14 steel has the best performance in terms of tool life at different cutting speeds. This difference is maximum at the lowest cutting speed, which gradually decreases with the increase of the cutting speed. The wear behavior is evaluated in the three steel alloys at each cutting speed and, consequently, the tool wear exhibits a slightly better performance in the dry machining condition for higher cutting speeds (180 and 240 m/min), independent of the steel alloy. Finally, EDS analysis confirms the presence of Mn and S elements at the rake face of the inserts machined in dry condition. Hence, MnS is expected to interpose between the machined surface and cutting tool surface to behave similar to tribofilm by reducing the wear on the cutting edge.

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“…In recent years, attempts have been made to develop cheaper manufacturing technologies compatible with the environment, such as machining with a minimum quantity of lubricant (MQL), dry machining, or machining with cold compressed air [32,33]. Machining hybrid components causes an increase in the instability of the process, mainly due to the different cutting characteristics of the different materials [20].…”

Section: Introductionmentioning

confidence: 99%

“…The search for optimal combinations of cutting conditions, tools, and lubrication/cooling systems for the simultaneous machining of materials with different natures has been the subject of many investigations. They have analysed aspects such as cutting tools (base materials, geometry, coatings, and wear), the surface quality required for the optimal performance of the piece, and the lubrication system [20,26,27,[30][31][32][33][34][35][36][37][38][39] or machining conditions used [40][41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study for Improving the Repair of Magnesium–Aluminium Hybrid Parts by Turning Processes

Rubio

Villeta

Valencia

et al. 2018

Metals

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Abstract:One of the lightest metallic materials used in the aeronautics, aerospace, and automotive industries, among others, is magnesium, due to its excellent weight/strength ratio. Most parts used in these industries need to be made of materials that are rigid, strong, and lightweight, but sometimes the materials do not simultaneously satisfy all of the properties required. An alternative is to combine two or more materials, giving rise to a hybrid component that can satisfy a wider range of properties. The pieces machined in these industrial fields must satisfy stringent surface roughness requirements that conform to the design specifications. This work shows an experimental study to analyse the surface roughness reached in hybrid components made up of a base of magnesium alloy (UNS M11917) and two inserts of aluminium alloy (UNS A92024) obtained by turning. Its purpose is to determine the influence of the factors and their possible interactions on the response variable, the surface roughness Ra. The study is carried out using a design of experiments (DOE). A product of a full factorial 2 3 and a block of two factors 3 × 2 was selected. The factors identified as possible sources of variation of the surface roughness are: depth of cut, feed rate, spindle speed, type of tool, location with respect to the specimen (LRS), and location with respect to the insert (LRI). Data were analysed by means of the analysis of variance (ANOVA) method. The main conclusion is the possibility to carry out the repair and maintenance of parts of magnesium-aluminum hybrid components by dry turning; that is, without cutting fluids and, therefore, in the most sustainable way that the process can be carried out. In addition, different combinations of cutting parameters have been identified that allow these operations to be carried out in an efficient manner, reducing mechanization times and, therefore, also the direct and indirect costs associated with them.

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Cooling Systems Based on Cold Compressed Air: A Review of the Applications in Machining Processes

Cited by 37 publications

References 21 publications

Repairing Hybrid Mg–Al–Mg Components Using Sustainable Cooling Systems

Repairing Hybrid Mg–Al–Mg Components Using Sustainable Cooling Systems

Wear and MnS Layer Adhesion in Uncoated Cutting Tools When Dry and Wet Turning Free-Cutting Steels

Experimental Study for Improving the Repair of Magnesium–Aluminium Hybrid Parts by Turning Processes

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