Info: Zenodo’s user support line is staffed on regular business days between Dec 23 and Jan 5. Response times may be slightly longer than normal.

Published February 29, 2020 | Version v1
Journal article Open

IMPROVING THE ABRASIVE RESISTANCE OF A SLIDE FRAME IN A MORTAR MIXER

Creators

  • 1. National University «Yuri Kondratyuk Poltava Polytechnic»

Description

A method has been proposed for machining the outer and inner conical surfaces of the wrist pin and insert, which represent a sliding friction pair on the mortar mixer frame. The machining implies the application on the conical surface of parts, preliminary prepared through turning, of a wear-resistant material in the form of a hard alloyed nickel-based powder. It is applied with a special burner with a hopper-dispenser filled with powder. The result of mixing a combustible gas (acetylene and oxygen) in the burner with the powder from the hopper is melting.

In the course of implementing a given technological process, by using mathematical modeling methods, we have determined the optimal mode parameters (PG10N-01 powder consumption is 33.5 g/min.; oxygen flow rate is 7.0 l/min; acetylene pressure is 0.043 MPa) for the gas-flame surfacing, which ensured maximum effect, that is, the greatest strength of adhesion (45 MPa) for the surfaced coating. The surfaced coating quality was checked by using a pin method for determining the adhesion strength between the new coating and the base on a tensile testing machine.

A series of experimental studies into the enhancement of abrasive resistance of a sliding frame, namely a comparison of the surfaced coating with other well-known wear-resistant materials such as steel ShKh15, KhVG, were carried out at a specially designed experimental bench. Its structure is based on a vertically drilling desktop machine adjusted to the conditions of a working process that occurs inside the body of a mortar mixer. These include an abrasive medium, and the radial and axial efforts. To determine the axial load on a frame, we have proposed a structure of the hydraulic device, which includes a pressure gauge, a piston, a sleeve, and a ball. The axial load has been found for the most unfavorable conditions of mixer operation. Its value was implemented at an experimental wear bench. In addition, we have performed a series of experimental studies to determine an optimum angle of the cone at the apex of the wrist pin and insert in a conical slide frame for the minimal wear.

Using the proposed technique of a gas-flame surfacing could significantly improve the abrasive and corrosion resistance of a slide frame, thereby prolonging the lifespan of a mortar mixer in general, as well as the overhaul cycle for equipment designed to prepare soluble mixtures used for construction

Files

Improving the abrasive resistance of a slide frame in a mortar mixer.pdf

Files (2.3 MB)

Additional details

References

  • Biletskyi, V. S. (Ed.) (2004). Mala hirnycha entsyklopediya. Donetsk: Skhidnyi vydavnychyi dim, 640.
  • Onyshchenko, O. H., Popov, S. V. (2005). Rehulovani konichni pidshypnyky kovzannia mobilnoi rozchynozmishuvalnoi ustanovky URZ-3,8. Eastern-European Journal of Enterprise Technologies, 6 (1 (18)), 45–47.
  • Onyshchenko, O. H., Vashchenko, K. M., Popov, S. V. (2007). Perspektyvy vykorystannia rozchynozmishuvalnoi ustanovky URZ-3,8 na budivelnykh maidanchykakh Ukrainy. Sovremennye problemy stroitel'stva. Donetsk: Donetskiy PromstroyNIIproekt, 138–144.
  • Kravchenko, S., Popov, S., Gnitko, S. (2016). The working pressure research of piston pump RN-3.8. Eastern-European Journal of Enterprise Technologies, 5 (1 (83)), 15–20. doi: https://doi.org/10.15587/1729-4061.2016.80626
  • Popov, S., Vasilyev, A., Lednik, R. (2015). Theoretical wear research of conical friction bearing. Technology Audit and Production Reserves, 2 (1 (22)), 60–64. doi: https://doi.org/10.15587/2312-8372.2015.41395
  • Kaplun, P., Gonchar, V., Bodnar, R. (2013). Enhancement of steel wear resistance in corrosive and abrasive medium. Interdisciplinary integration of science in technology, education and economy. Bydgoszcz-Poland, 320–329.
  • Sobolev, V. V., Guilemany, J. M., Miguel, J. R., Calero, J. A. (1996). Influence of in-flight dissolution process on composite powder particle (WCNi) behaviour during high velocity oxy-fuel spraying. Surface and Coatings Technology, 81 (2-3), 136–145. doi: https://doi.org/10.1016/0257-8972(95)02481-6
  • Sobolev, V. V., Guilemany, J. M., Miguel, J. R., Calero, J. A. (1996). Influence of thermal processes on coating formation during high velocity oxy-fuel (HVOF) spraying of WC-Ni powder particles. Surface and Coatings Technology, 82 (1-2), 121–129. doi: https://doi.org/10.1016/0257-8972(95)02657-6
  • Shrestha, S., Hodgkiess, T., Neville, A. (2005). Erosion–corrosion behaviour of high-velocity oxy-fuel Ni–Cr–Mo–Si–B coatings under high-velocity seawater jet impingement. Wear, 259 (1-6), 208–218. doi: https://doi.org/10.1016/j.wear.2005.01.038
  • Dent, A. H., Horlock, A. J., McCartney, D. G., Harris, S. J. (2001). Microstructural characterisation of a Ni-Cr-B-C based alloy coating produced by high velocity oxy-fuel thermal spraying. Surface and Coatings Technology, 139 (2-3), 244–250. doi: https://doi.org/10.1016/s0257-8972(01)00996-3
  • Sang, K., Li, Y. (1995). Cavitation erosion of flame spray weld coating of nickel-base alloy powder. Wear, 189 (1-2), 20–24. doi: https://doi.org/10.1016/0043-1648(95)06608-x
  • Huang, F., Xu, H., Liu, W., Zheng, S. (2018). Microscopic characteristics and properties of titaniferous compound reinforced nickel-based wear-resisting layer via in situ precipitation of plasma spray welding. Ceramics International, 44 (6), 7088–7097. doi: https://doi.org/10.1016/j.ceramint.2018.01.148
  • Janka, L., Berger, L.-M., Norpoth, J., Trache, R., Thiele, S., Tomastik, C. et. al. (2018). Improving the high temperature abrasion resistance of thermally sprayed Cr3C2-NiCr coatings by WC addition. Surface and Coatings Technology, 337, 296–305. doi: https://doi.org/10.1016/j.surfcoat.2018.01.035
  • Kazasidis, M., Yin, S., Cassidy, J., Volkov-Husović, T., Vlahović, M., Martinović, S. et. al. (2020). Microstructure and cavitation erosion performance of nickel-Inconel 718 composite coatings produced with cold spray. Surface and Coatings Technology, 382, 125195. doi: https://doi.org/10.1016/j.surfcoat.2019.125195