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1
Content available The influence of workpiece speed on microhardness and residual stresses in vacuum-carburised 20MnCr5 steel using the single-piece flow method
Sawicki J., Januszewicz B., Sikora M., Witkowski B.
Archives of Materials Science and Engineering
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2022
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Vol. 115, nr 2
66--75
EN
Purpose: To determine the impact of selected conditions of abrasive treatment on the value and distribution of microhardness and residual stresses in layers carburised by a continuous single-piece flow method. Design/methodology/approach: Reference pieces were low pressure carburised at 920°C and then heat-treated in a 4D Quench heat treatment chamber at a pressure of 7 bar and tempered at 190ºC for 3 hours. In the next stage, samples were ground at various vw piece speeds, introducing grinding fluid into the cutting zone using the WET spraying method or using the MQL method at a minimum flow rate. The distribution of microhardness and residual stresses generated in the technological outer layer of the pieces following heat and chemical treatment and the grinding process was measured. Findings: Results of the tests indicated that the vw piece speed and method used to supply cooling and lubricating fluid to the grinding zone had an impact on selected parameters of the technological outer layer of flat samples made of 20MnCr5 steel. The process of grinding using an electrocorundum grinding wheel results in a deterioration of residual stresses in the material. For each of the three analysed vw piece speeds, reduced changes in material microhardness prior to cutting occur in the outer layer of samples ground using GF supplied at a minimum flow rate using the MQL method. Research limitations/implications: Environmental considerations and having to conform to increasingly stringent regulations related to environmental protection and employee safety motivate researchers and businesses to entirely eliminate or reduce the use of grinding fluids in the grinding process and, therefore, to optimise grinding technology. Practical implications: Modern manufacturing industry requires the grinding process, which follows heat and chemical treatment, to be performed with the highest possible efficiency. However, retaining high parameters of the technological outer layer in comparison to the sample material following vacuum carburisation (before grinding) is extremely difficult. An optimised configuration of parameters of the grinding process and method of supplying grinding fluids enables meeting the current and future high expectations of the industry in this regard. Originality/value: The tests have enabled us to determine the impact of the applied vw workpiece speed and method of supplying grinding fluid on microhardness and residual stresses. Generally speaking, grinding with an electrocorundum grinding wheel results in a deterioration of residual stresses. For both methods of supplying GF (WET and MQL), the distribution of microhardness in the material of the samples ground with the highest workpiece speed (18.0 m/min) indicated no significant differences with regard to the distribution of microhardness in the material of the samples following heat and chemical treatment.
2
Content available Transport i obróbka przedmiotów na docierarkach tarczowych
Barylski A.
Autobusy : technika, eksploatacja, systemy transportowe
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2018
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R. 19, nr 6
354--358, CD
PL
Docierania i szlifowanie należy do podstawowych metod obróbki wykończeniowej. Technologie te stosowane są obecnie zarówno w obróbce elementów metalowych, jak i niemetalowych. Przeanalizowano czas, jaki jest potrzebny do wykonania tych operacji.
EN
Lapping and grinding are classified as a basic finishing operation. This technology can be used on metallic parts, as well as on non-metallic machine elements. Times required to finalize operation are calculated and analyzed in this paper.
3
Content available Efficiency analysis of the disc working element in reference of treatment technology of concrete surface
Kalinowski J., Rajczyk Z., Al-Mashadani M.
Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo
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2009
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Z. 15 (165)
107-118
EN
The article contains the theoretical bases of the analyses process floating causes and grinding concrete surface. The particular attention has been paid to quality factors of processing determined by roughness uniformity of processed surface.
PL
Artykuł zawiera teoretyczne podstawy analizy procesu zacierania i szlifowania powierzchni betonowych. Szczególną uwagę zwrócono na parametry jakości obróbki określonej równomiernością szorstkości obrabianej powierzchni.
4
Content available remote Przemysłowe posadzki betonowe - teoria i rzeczywistość
Kulas T.
Materiały Budowlane
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2008
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nr 9
5-8
5
Content available remote Dobór parametrów w technologii szlifowania powierzchni płyty betonowej
Rajczyk J., Rajczyk Z., Kosiń M.
Budownictwo o Zoptymalizowanym Potencjale Energetycznym
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2007
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nr (4)
300--309
EN
In the article selected parameters in technology of grinding concrete slab surface are presented.
6
Content available remote Identification of vibration sources influencing the geometric structure of grinding surface
Krakowiak M., Barczewski R.
Vibrations in Physical Systems
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2002
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Vol. 20
198--199
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