Study of the Board Output from the Saws when Cant Sawing Parallel to Generatrix

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UDС

674.09

DOI:

10.17238/issn0536-1036.2018.3.117

Abstract

The paper proposes the method of cutting the sawlogs when cant sawing parallel to generatrix. Dull-edged timber is ripsawed into two parts after cutting, and each of the obtained three-side edged cants is sawn parallel to generatrix. Two methods of sawing are possible: with the production of cut sawn timber from the heart parts of a squared beam or wedge-shaped sawn timber. At the same time not only the volume, but also the quality output of sawn timber increases. With the help of the simulation model for comparison, the authors carry out experimental studies of the lumber yield when sawing parallel to generatrix and parallel to the longitudinal axis of the log. Dependences of the board output from the saws on the diameter, length and average taper are obtained. The ranges of variation of the diameter is from 28 to 36 cm, the length is from 4 to 6 m, the average taper is from 1.0 to 2.8 cm/m. The dependency graphs of the board output from the saws from the investigated factors are constructed. The greatest effect on the lumber yield is provided by taper. The diameter does not exert a strong influence on the board output from the saws when cant sawing parallel to generatrix in comparison with the sawing parallel to the longitudinal axis of the log; with a diameter greater than 32 cm, the lumber yield increases insignificantly. Compared with sawing parallel to the axis, the board output from the saws when sawing parallel to generatrix is 2...6 % higher. Increasing the length of the log reduces the lumber yield when cant sawing parallel to generatrix and the longitudinal axis. Low values of the average taper (1.0...1.3 cm/m) do not give advantages to both sawing methods. With an increase in the average taper to 2.8 cm/m, the lumber yield when sawing parallel to generatrix increases by 4...6 %. Cant sawing parallel to generatrix to produce wedge-shaped sawn timber in comparison with the production of cut sawn timber from the heart parts of a squared beam increases the board output from the saws by 1.0...1.5 %.

Authors

E.V. Mikryukova, Candidate of Engineering Sciences, Associate Professor
A.S. Toropov, Doctor of Engineering Sciences, Professor
V.M. Pekmenov, Graduate Student

Affiliation

Volga State University of Technology, pl. Lenina, 3, Yoshkar-Ola, Mari El Republic, 424000, Russian Federation; e-mail: mikryukovaev@volgatech.net

Keywords

sawlog, squared beam, sawn timber, method of cutting parallel to generatrix, method of cutting parallel to the longitudinal axis, output of lumber

For citation

Mikryukova E.V., Toropov A.S., Pekmenov V.M. Study of the Board Output from the Saws when Cant Sawing Parallel to Generatrix. Lesnoy zhurnal [Forestry journal], 2018, no. 3, pp. 117–126. DOI: 10.17238/issn0536-1036.2018.3.117

References

1. Aksenov P.P. Tekhnologiya pilomaterialov [Lumber Technology]. Moscow, Goslesbumizdat Publ., 1963. 578 p. (In Russ.)
2. Mikryukova E.V., Pekmenov V.M. Osobennosti opredeleniya vykhoda piloproduktsii pri raskroe brusa parallel'no obrazuyushchey [Features of Determining the Output of Lumber Cutting of Squared Timber in Parallel Generatrix]. Aktual'nye napravleniya nauchnykh issledovaniy XXI veka: teoriya i praktika [Actual Directions of Scientific Researches of the 21st Century: Theory and Practice], 2014, no. 2-2(7-2), pp. 336‒340.
3. Mikryukova E.V., Toropov A.S., Razumov E.Yu., Yanalova N.A., Pekmenov V.M. Sposob raskroya breven [Method of Round Timber Cutting]. Patent RF, no. 2529169, 2014.
4. Pizhurin A.A., Pizhurin A.A. Osnovy nauchnykh issledovaniy v derevoobrabotke [Fundamentals of Scientific Research in Woodworking]. Moscow, MSFU Publ., 2005. 305 p. (In Russ.)
5. Poluboyarinov O.I. Plotnost' drevesiny [Wood Density]. Moscow, Lesnaya promyshlennost’ Publ., 1976. 160 p. (In Russ.)
6. Sidorov I.I. Raspilovka dvukhkantnykh brus'ev parallel'no obrazuyushchey [Cutting of Dull-Edged Timber Parallel to Generatrix]. Lesnoy zhurnal [Forestry journal], 1975, no. 3, pp. 76‒81.
7. Ulasovets V.G. Sravnenie ob"emov neobreznykh dosok pri razlichnykh sposobakh raspilovki breven [Comparison of Unedged Boards Volumes under Different Methods of Log Sawing]. Lesnoy zhurnal [Forestry journal], 2005, no. 5, pp. 69‒74.
8. Ulasovets V.G. Sravnitel'nyy analiz dvukh sposobov raspilovki breven na neobreznye pilomaterialy [Comparative Analysis of Two Methods of Breaking-Down of Logs into Unedged Lumber]. Derevoobrabatyvayushchaya promyshlennost' [Woodworking Industry], 2005, no. 1, pp. 5‒7.
9. Khrabrova O.Yu. Issledovanie poperechnogo korobleniya pilomaterialov, poluchaemykh pri raspilovke parallel'no obrazuyushchey i traditsionnym sposobom [The Study of Transverse Warpage of Lumber Produced when Cutting Parallel to Taper and Traditional Way]. Izvestia Sankt-Peterburgskoj lesotehniceskoj akademii (Izvestia SPbLTA) [News of the Saint Petersburg State Forest Technical Academy], 2016, no. 214, pp. 233‒246.
10. Chubinskiy A.N., Tambi A.A., Shvets V.L. Analiz vliyaniya kachestvennykh kharakteristik kruglykh lesomaterialov na vybor brevnopil'nogo oborudovaniya [Analysis of Sawlogs Shape Influence on Sawmill Equipment Choice]. Izvestia Sankt-Peterburgskoj lesotehniceskoj akademii (Izvestia SPbLTA) [News of the Saint Petersburg State Forest Technical Academy], 2014, no. 208, pp. 63‒72.
11. Heräjärvi H. Variation of Basic Density and Brinell Hardness within Mature Finnish Betula pendula and B. pubescens Stems. Wood and Fiber Science, 2004, no. 2, pp. 216‒227.
12. Grekin M., Verkasalo E. Variations in and Models for Brinell Handness of Scots Pine Wood from Finland and Sweden. Baltic Forestry, 2013, vol. 19, no. 1, pp. 128‒136.
13. Nikulshin S., Semishkur S., Tambi A., Chubinsky A. Strength of Spruce Wood. Internationale Studierenkonferenz “SPRUNGBRETT”, Center for Development and Cooperation CDC, Berner Fachhochschule. Schweiz, Biel, 2015, vol. 0, pp. 133‒138.

Received on December 15, 2017