![]() Address: Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russian Federation, Northern (Arctic) Federal University named after M.V.Lomonosov, office 1425
Phone: +7 (8182) 21-61-18 Lesnoy Zhurnal |
A.E. Alekseev, A.I. Dumanskiy, I.О. Dumanskiy Complete text of the article:Download article (pdf, 0.4MB )UDС674.093DOI:10.17238/issn0536-1036.2015.3.84AbstractDeadwood shows high durability and hardness. It leads to considerable abrasive wear of chipper knife's edge during deadwood chip processing. In this case material requirements are the following: higher hardness of cutting edge (HRC 62…65 compared with traditional HRC 56…58) on retention of adequate dynamic strength. These characteristics are unachievable by selection of exclusive steel alloying or adjustment of traditional thermal treatment modes. Demanded characteristics can be obtained during laser thermal treatment of chipper knife's edge, by building up a special structural condition of steel. Laser thermal treatment adoption for chipper knife's alloy steel introduces many problems. Deficiency of scientific grounded laser thermal treatment modes is the major problem. Our investigation was focused on working out such modes. Conventional chipper knifes made of 60Cr7WSiMoV steel were used for laser thermal treatment on laser beam machine “Kvant- 15” during scientific investigation. Influence of radiation power on surface coating hardness and quantity of retained austenite in laser impingement point with internal radiation diameter was studied during scientific experiments. Radiation power was regulated by pumping condensers' charge voltage variation. Laser impingement points were arranged without overlapping during condensers' charge voltage variation in the range from 400 to 850 W at a pitch of 50 W, along with overlap ratio 0,5 and 0,75. Three factors were used for optimization: maximum hardness of steel in laser impingement point, minimum percentage (no more 5 %) of retained austenite in laser impingement point and minimum degree of reflowing. Optimal laser processing mode is the following: laser treatment with 3,0 mm diameter shots, 2 Hz pulse repetition frequency and 3 mm/s beam stroking speed. These characteristics provided overlap ratio equal 0,5, with pumping condensers' charge voltage U = 750-800 W relevant to 5…6 J shot power. Optimal edge's structure with hardness HRC 63...64 and high dynamic strength is achieved thereby.AuthorsA.E. Alekseev, Doctor of Engineering, Professor A.I. Dumanskiy, Head of Laboratory I.О. Dumanskiy, Candidate of Engineering, Associate ProfessorAffiliationNorthern (Arctic) Federal University named after M.V. Lomonosov, Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russia; e-mail: i.dumanskij@agtu.ruKeywordsdeadwood, chipping machine, alloy steel, laser thermal treatment.References1. Voskresenskiy S.A. Rezanie drevesiny [Wood Cutting]. Moscow, Leningrad, 1955. 200 p. 2. Geller Yu.A. Instrumental'nye stali [Instrumental Steels]. Мoscow, 1983. 527 p. 3. GOST 2999-75. Metally i splavy. Metod izmereniya tverdosti po Vikkersu [State Standard 2999-75. Metals and Alloys. Vickers Hardness Test]. 4. GOST 9450-76. Izmerenie mikrotverdosti vdavlivaniem almaznykh nakonechnikov [State Standard 9450-76. Diamond-Pyramid Micro-Hardness Test]. 5. GOST 23677-79. Tverdomery dlya metallov. Obshchie tekhnicheskie trebovaniya [State Standard 23677-79. Durometers for Metals. General Specifications]. 6. GOST 17342-81. Nozhi rubitel'nykh mashin [State Standard 17342-81. Chipper Knifes]. 7. Kalinin D.М. Rezhushchiy instrument v derevoobrabotke [Cutting Tool in Wood- Processing]. Мoscow, 1935. 8. Pizhurin A.A., Rozenblit M.S. Issledovaniya protsessov derevoobrabotki [Wood- Procesing Investigation]. Мoscow, 1984. 232 p. 9. Arzamasov V.N. Spravochnik po konstruktsionnym materialam [Construction Ma-terials Guide Book]. Мoscow, 2006. 637 p.Mode Selection of Laser Thermal Treatment of Chipping Machine Knifes for Deadwood Processing |
Make a Submission
Lesnoy Zhurnal (Russian Forestry Journal) was awarded the "Seal of Recognition for Active Data Provider of the Year 2024" INDEXED IN:
|
![]() |
|
![]() |
![]() |
![]() |
|
![]() |
|
![]() |
|
![]() |
|
![]() |
![]() |
![]() |
|
![]() |
![]() |
![]() |
|
![]() |
![]() |
![]() |
|
![]() |
![]() |
![]() |
|
![]() |
|
![]() |
![]() |
![]() |
![](/img/transparent.gif)