The Study of Shrinkage of Drilled Holes in Polymer Composite Materials

The article presents a non-trivial phenomenon that occurs when machining polymer composite materials and that affects its accuracy, namely a decrease in the diameter of drilled holes subsequent to drilling. The experimental results on the shrinkage of the holes after drilling in a variety of grades of polymer composite materials are given. The tests were carried out using two types of cutting tools (diamond and high-performance carbide drills manufactured by HAM) with different combinations of drilling parameters. The shrinkage was measured using the ATOS III Triple Scan XL scanning system immediately after the drilling and after 48 hours.  It is known that there is no hole shrinkage in structural materials, while in polymer composites it can reach 0.02…0.03 mm dependent on the brand.

References

[1] Dudarev A.S. Povyshenie effektivnosti i kachestva obrabotki otverstii na osnove stabilizatsii protsessa sverleniia izdelii iz polimernykh kompozitsionnykh materialov. Diss. kand. tekh. nauk [Improving the efficiency and quality of handling of holes by drilling process stabilization products from polymeric composite materials. Cand. tech. sci. diss.]. Permian, PSTU publ., 2009. 22 p.

[2] Stepanov A.A. Obrabotka rezaniem vysokoprochnykh kompozitsionnykh polimernykh materialov [Machining of high-strength composite polymer materials]. Leningrad, Mashinostroenie publ., Leningrad branch, 1987. 176 p.

[3] Drozhzhin V.I. Fizicheskie osobennosti i zakonomernosti protsessa rezaniia sloistykh plastmass. Diss. dokt. tekh. nauk [Physical characteristics and laws of process of cutting of laminated plastics. Dr. tech. sci. diss.]. Kiev, Institut sverkhtverdykh materialov AN USSR publ., 1983. 41 p.

[4] Krishtopa N.A., Radzevich S.P., Bobko A.I. Obrabotka otverstii v kompozitsionnykh nemetallicheskikh materialakh [Processing of holes in nonmetallic composite materials]. Kiev, Tekhnika publ., 1980. 125 p.

[5] Shtuchnyi B.P. Obrabotka plastmass rezaniem [Machining of plastics cutting]. Moscow, Mashinostroenie publ., 1974. 144 p.

[6] Dudarev A.S., Svirshchev V.I. Iavlenie usadki otverstii poluchennykh sposobom sverleniia v izdeliiakh ikh polimernykh kompozitsionnykh materialov [The phenomenon of shrinkage of the holes obtained by the method of drilling into products of composite materials]. Tekhnologicheskoe obespechenie nadezhnosti i dolgovechnosti mashin: sb. nauch. tr. [Technological provision of reliability and durability of machines: collection of scientific papers]. Izhevsk, IPM UrO RAN publ., 2006, pp. 168–170.

[7] Bulovskii P.I., Petrova N.A. Mekhanicheskaia obrabotka stekloplastikov [Machining of plastics]. Moscow, Mashinostroenie publ., 1968. 152 p.

[8] Dudarev A.S. Konstruktsii sverl i frez dlia almazno-abrazivnoi obrabotki stekloplastikov i ugleplastikov [Designs of drills and mills for diamond processings of polymeric composite materials]. Izvestiia Tul’skogo gosudarstvennogo universiteta. Tekhnicheskie nauki [Izvestiya of the Tula state University. Technical science]. 2012, no. 5, pp. 66–75.

[9] Dudarev A.S. Konstruktsii almaznogo instrumenta dlia sverleniia i frezerovaniia polimernykh kompozitsionnykh materialov [Construction diamond tools for drilling and milling of polymer composites]. STIN [Russian Engineering Research]. 2013, no. 6, pp. 9–15.

[10] Dudarev A.S., Safonov I.I., Steshin A.A. Osobennosti mekhanicheskoi obrabotki polimernykh kompozitsionnykh materialov [Polymer composite machining features]. Tekhnologiia mashinostroeniia [Tekhnologiya Mashinostroeniya]. 2014, no. 1, pp. 23–26.

[11] Frumkin V.D., Rubichev N.A. Teoriia veroiatnostei i statistika v metrologii i izmeritel’noi tekhnike [Theory of probability and statistics in Metrology and measurement technology]. Moscow, Mashinostroenie publ., 1987. 168 p.

[12] Lial’kina G.B. Matematicheskaia obrabotka rezul’tatov eksperimenta [Mathematical processing of experimental results]. Perm’, PNIPU publ., 2013. 77 p.

[13] Ostrosablin N.I. Ploskoe uprugoplasticheskoe raspredelenie napriazhenii okolo krugovykh otverstii [Flat elastoplastic stress distribution around circular hole]. Novosibirsk, Nauka publ., 1984. 113 p.

[14] Savin G.N. Raspredelenie napriazhenii okolo otverstii [The distribution of stresses around holes]. Kiev, Naukova dumka publ., 1968. 887 p.