Accuracy Control in the Machining of Low Rigidity Shafts

Świć, Antoni; Wołos, Dariusz; Zubrzycki, Jarosław; Opielak, Marek; Gola, Arkadiusz; Taranenko, V.

doi:10.4028/www.scientific.net/amm.613.357

Cited by 38 publications

(31 citation statements)

References 12 publications

(14 reference statements)

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“…The deflection of a semi-finished product that can be eliminated with the help of heat treatingstraightening, taking into account that the output deflection cannot be greater than the maximum quality value, is determined as follows: during the cooling the shortening of the semi-finished product should be less than the sum of elongations: (11) where: δ sp -shrinkage of fixture as a result of load caused by the reduction in the length of the semi-finished product, equal: (12) where: R e -limit of plasticity of material of semifinished product at 20°С, E u -modulus of longitudinal elasticity of material of fixture at 20°С, K s -ratio of fixture stiffness to stiffness of semi-finished product, δ wp -elongation of semi-finished product, at which the stress in outermost compressed fibre was not lower than the limit of plasticity of shaft material in tension, i.e.…”

Section: Analytical Determination Of Rectilinearity Of Shaft Axis In mentioning

confidence: 99%

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Technology of Heat Treating-Straightening of Long Shafts With Low Rigidity

Świć¹,

Draczew²,

Gola³

2016

Adv. Sci. Technol. Res. J.

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The paper presents a new method of heat treating-straightening of long shafts with low rigidity. Analytical relationships for the determination of rectilinearity of shaft axis in heat treating-straightening are presented. A fixture for heat treating-straightening of shafts was developed. The experiment conducted as well as the calculations confirm high effectiveness of the developed method of heat treating-straightening of long shafts with low rigidity. Application of the developed technology of heat treatingstraightening permits minimisation of the value of deflection of semi-finished product and stabilisation of the level of residual longitudinal stress, which results in enhanced operational accuracy of long shafts with low rigidity, improved quality and operation parameters of finished products.

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Section: Analytical Determination Of Rectilinearity Of Shaft Axis In mentioning

confidence: 99%

“…Shaft-type parts with low rigidity are used in many contemporary machines, fixtures and other devices [1,6,7,8,10,11,12,13,14]. The continuous growth of production of low-rigidity shafts is determined by the growing production of precision machines.…”

Section: Introductionmentioning

confidence: 99%

Technology of Heat Treating-Straightening of Long Shafts With Low Rigidity

Świć¹,

Draczew²,

Gola³

2016

Adv. Sci. Technol. Res. J.

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“…Nowadays much of mechanical engineering industries apply critical non-rigid pieces (NRP) production increase of which is caused by blank and construction shape optimization, constant reduction of the produce steel intensity and constant increase of precise machines production. The problems of the NRP operating reliability increase is supposed to have significance verily at the moment [1][2][3][4][5][6][7][8][9]. The NRP processing has a few sides of fixes, such as significant resilient and residual deformation during all the stages, the technology system units low vibration resistance and admittance, irregular residual stress having place at all the stages.…”

Section: Introductionmentioning

confidence: 99%

Improving the accuracy of machining of non-rigid shaft

2018

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So far, due to much more strict events of operating parameters requirements, the reduction of pieces steel intensity allows to produce multiplying quantity of the highly precise Non-Rigid Pieces (NRP); most of them are supposed to be the shafts in amount. The creation of Automatic Control Systems (ACS) by mechanical operating also involves highly precise NRP production. In present paper there is Self-Centering Rest (SCR) operating hydrocylinder piston rod control system presented; it causes influence directly to the rest centering accuracy. The plant processing does not require hydrostation and pipeline; it possesses highly precise centering and it is able to function either in shaft support mode, or in active dampening one. There is the original scheme of double acting sealed hydrocylinder presented. There is the functional control scheme of hydraulic power cylinder presented. There are results of the non-rigid shaft axle research while turning presented. Thus, the beat reduction of the rigid shaft while turning in SCR system reaches 3...16 times in comparison.

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“…They are characterized by a greater passivation potential in physiological solutions. Mechanical properties and corrosion resistance is determined by the chemical composition and structure depending on the type of technology and manufacturing conditions [1,2]. In this respect, cobalt alloys can be divided into casting and wrought alloys.…”

Section: Introductionmentioning

confidence: 99%

Changes in the Structure and Physical Properties of Heat-Treated Cobalt-Based Biomaterial

Błaszczak¹

2017

Intelligent Computing and Information Engineering (ICIE)

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The paper describes cast cobalt alloy after thermal processing -recrystallizing annealing in 1173 ÷ 1473 K temperature range. The aim of processing was to decrease the percentage of the dendritic structure and obtain crystalline structure. The foundations of thermal processing considered the diffusion phenomenon, its parameters were determined analytically. Further, the detailed parameters of processing, results of microstructural analysis, as well as phase diffractometry, full microanalysis of chemical composition and hardness measurements are presented. INTRODUCTIONCobalt-based alloys are a group of metallic materials suitable for products for reconstructive surgery. They are characterized by a greater passivation potential in physiological solutions. Mechanical properties and corrosion resistance is determined by the chemical composition and structure depending on the type of technology and manufacturing conditions [1,2]. In this respect, cobalt alloys can be divided into casting and wrought alloys.The main alloying elements include chromium, the concentration of which varies within 18 ÷ 30%, molybdenum in the range from 2.5 to 9%, and nickel with concentration in the range of 15 to 35%. Wrought alloys also have tungsten in an amount of 3 ÷ 8.8%. Cobalt also include coal whose maximum concentration is in the range of 0.05 ÷ 0.35%.The basic element which undergoes segregation is chromium, the concentration of which varies in the range 19 ÷ 35%. Molybdenum is segregated to a lesser extent with concentration changing within the range of 4 to 6%.The most commonly used cobalt alloy is Vitalism type Co-Cr-Mo casting alloy. The matrix of the Co-Cr-Mo cast alloy is made of crystallites of the solid solution of chromium, molybdenum and carbon in β-Co with A1 network. Within crystallites, there are strong dendritic micro segregation and in the interdendritic areas and along the crystallite borders there are primary separations of a continuous nature. The heat treatment of cast alloys is used to improve the mechanical and fatigue properties; the results strongly depend on the modification of the chemical composition and metallurgical quality of the casting [3].The alloys of this type do not include iron or tungsten, the stabilizing additive is niobium. Excluding the iron from the alloy composition increases resistance to corrosion. Another factor that increases resistance, especially to pitting and intergranular corrosion, is lower carbon content, which in the presence of carbide forming alloying elements causes the formation of unfavourable M23C6 carbides in the alloys [3,4]. The allotropic transformation α -Co <=> β -Co is the most important from the point of view of biomaterials.Changing the structure from A1 (β -Co) to A3 (α -Co) can be made by forming a stacking fault on every other plane {111} in A1 network [4,5]. As a result, the sequence of the planes changes from ABCABC the ABAB planes (0001). Such a sequence alteration may be formed by the movement of Shockley partial dislocation with Burgers vector 21...

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Accuracy Control in the Machining of Low Rigidity Shafts

Cited by 38 publications

References 12 publications

Technology of Heat Treating-Straightening of Long Shafts With Low Rigidity

Technology of Heat Treating-Straightening of Long Shafts With Low Rigidity

Improving the accuracy of machining of non-rigid shaft

Changes in the Structure and Physical Properties of Heat-Treated Cobalt-Based Biomaterial

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