Influence of spatial welding on the accuracy of working dimensions of drilling chisels of cutting-erasing type
Keywords:PDC bits, finite element studies, welding, weld, stress-strain state, accuracy.
The article considers the problem of PDC drill bit quality provided during manufacturing. Schemes of welded joint making are theoretically substantiated based on theoretical research, computer modelling and experimental tests for L-shaped details like PDC drill bit blades. The recommendations to provide welded joints for L-shaped details are developed. Based on the elastic-plastic analysis, means to reduce thermal longitudinal and transverse internal deformations caused by a heat source moving along the weld are theoretically substantiated. Simulation models have been developed to assess the influence of welding thermal action and residual deformations on accuracy of drill bit external diameter for different schemes of welding. Based on the developed models, it is shown that the thermal welding deformations of spatial curved welds are significant, and relate mainly to the blades rather than the body (i.e. less massive parts); there are bends, turns and skews of the blades. Finite-element simulation of the bit body – welded blades stress-strain state was performed sequentially in the environment ANSYS (academic license) – Transient Thermal (determination of heat load) and Static Structural (determination of deformations and stresses). It is established that the smallest deformations of the blade are observed for the welding scheme, which envisages making the weld from the point of cylindrical and ellipse surface pairing. The results obtained by simulations were confirmed by experimental data and this made possible substitution for a rational scheme of drill bit body – blade based on the method of reverse deformation, to ensure the accuracy of the product as a whole. Recommendations for weld joint making for spatial curved welds of complex products with requirements to their accuracy allow increasing the accuracy of the technology by minimizing the thermal load and residual thermal deformation of the joints.
Zhu J., Khurshid M., Barsoum Z. Accuracy of computational welding mechanics methods for estimation of angular distortion and residual stresses. Weld World. 2019. No. 63, P. 1391–1405 https://doi.org/10.1007/s40194-019-00746-9.
Chunbiao Wu, Kim Jae-Woong. Review on Mitigation of Welding-Induced Distortion Based on FEM Analysis. Journal of Welding and Joining. 2020. 38. 10.5781/JWJ.2020.38.1.6.
Seong W. J. Prediction and Characteristics of Angular Distortion in Multi-Layer Butt Welding. Materials (Basel, Switzerland). 2019. No. 12(9). P. 1435. https://doi.org/10.3390/ma12091435.
Tikhomirov D., Rietman B., Kose K., Makkink M. Computing Welding Distortion: Comparison of Different Industrially Applicable Methods. Advanced Materials Research. 2005. No 6–8. P. 195–202. https://doi.org/10.4028/
Islam M., Buijk A., Rais-Rohani M., Motoyama K. Simulation-based numerical optimization of arc welding process for reduced distortion in welded structures. Finite Elements in Analysis and Design. 2014. Vol 84. P. 54-64. https://doi.org/10.1016/j.finel.2014.02.003.
Yang X, Yan G, Xiu Y. et al. Welding Temperature Distribution and Residual Stresses in Thick Welded Plates of SA738Gr.B Through Experimental Measurements and Finite Element Analysis. Materials (Basel, Switzerland). 2019. Jul;12(15). DOI: 10.3390/ma12152436.
Barsoum Z., Ghanadi M., Balaw S. Managing Welding Induced Distortion – Compa-rison of different computational approaches. 1st International Conference on Structural Integrity Procedia Engineering. 2015. Vol. 114. P. 70–77.
Farajpour Mehdi, Ranjbarnodeh Eslam. Finite Element Simulation of Welding Distortion in Dissimilar Joint by Inherent Deformation Method. Soldagem & Inspeção. 2018. No 23. P. 60-72. DOI: 10.1590/0104-9224/si2301.07.
SPE/IADC 16145 Application of the new IADC dull grading system for fixed cutter bits. 1987.
Myasnikov Ya. V., Ionenko A. V., Gadzhiev S. G., Lipatnikov A. A., Leonov E. G. Rukovodstvo po otsenke iznosa dolot tipa PDC v promyislovyih usloviyah. Burenie i neft. 2004. No 3. P. 14-18. URL: http://iscpetro.ru/upload/
iblock/73d/73d73e289674c34015eafda2195968ca.pdf (data zvernennya: 20.06.2020). [in Russian]
RD 39-2-51-78. Kodyi iznosa dolot po metodike VNIIBT. [in Russian]
Polskiy E. A., Filkin D. M. Model kompleksnogo analiza razmernyih svyazey dlya odnostupenchatogo tehnologicheskogo obespecheniya tochnosti sborochnyih soedineniy. Izvestiya OrelGTU. Seriya «Fundamentalnyie i prikladnyie problemyi tehniki i tehnologii». 2008. No 3-6/271 (546). P. 92–99. [in Russian]
Syichev Yu. I. Povyishenie tochnosti i kachestva mnogopozitsionnoy obrabotki vyiborom strukturyi i parametrov agregatirovannyih tehnologicheskih sistem: avtoref. diss. na soiskanie uch. stepeni kand. tehn. nauk: spets. 05.02.08 – «Tehnologiya mashinostroeniya». Harkov, Natsionalnyiy tehnicheskiy universitet «Harkov-skiy politehnicheskiy institut», 2006. 24 p. [in Russian]
Ilitskiy V. B., Polskiy E. A., Filkin D. M. Model obespecheniya kachestva sborochnyih edinits na osnove analiza razmernyih svyazey: Spravochnik. Inzhenernyiy zhurnal. 2010. No 4 (157). P. 51–56. [in Russian]
How to Cite