| Summary: | To realize the reduction in cutting force and guarantee pruning section quality in the pruning and stubble work of <i>Caragana korshinskii</i> (C.K.), a concentric curvilineal edge sliding cutter was proposed and the related cutting characteristics were studied. The impacts of branch diameter (D), cutting speed (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi mathvariant="normal">V</mi></mrow><mrow><mi mathvariant="normal">c</mi></mrow></msub></mrow></semantics></math></inline-formula>), blade wedge angle (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="sans-serif">β</mi></mrow></semantics></math></inline-formula>), cutting clearance (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="normal">c</mi></mrow></semantics></math></inline-formula>) and moisture content (W) on peak torque (T) and cutting energy (E) with this cutter were explored in single-factor tests. On the basis of the Box—Behnken principle, a multi-factor test was further conducted based on the single-factor tests with <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi mathvariant="normal">V</mi></mrow><mrow><mi mathvariant="normal">c</mi></mrow></msub></mrow></semantics></math></inline-formula>, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="sans-serif">β</mi></mrow></semantics></math></inline-formula> and c as influencing factors and with T and E as targets, and a regression model was established. Test results indicate that the peak torque (T) increases with the increase in D and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="sans-serif">β</mi></mrow></semantics></math></inline-formula> and reduces with the growth of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi mathvariant="normal">V</mi></mrow><mrow><mi mathvariant="normal">c</mi></mrow></msub></mrow></semantics></math></inline-formula> and W; with the increase in <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="normal">c</mi></mrow></semantics></math></inline-formula>, it reduces first and then rises; the cutting energy (E) increases with the growth of D and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="sans-serif">β</mi></mrow></semantics></math></inline-formula>, declines with the increase in W and diminishes first and then rises with the increase in <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi mathvariant="normal">V</mi></mrow><mrow><mi mathvariant="normal">c</mi></mrow></msub></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="normal">c</mi></mrow></semantics></math></inline-formula>. The optimal parameter combination of the regression model was obtained with <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi mathvariant="normal">V</mi></mrow><mrow><mi mathvariant="normal">c</mi></mrow></msub></mrow></semantics></math></inline-formula> of 2.16 rad/s, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="sans-serif">β</mi></mrow></semantics></math></inline-formula> of 20<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>°</mo></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="normal">c</mi></mrow></semantics></math></inline-formula> of 1.0 mm, which resulted in a T of 17.25 N·m and P of 7.03 J. The discrepancies between the observed and forecasted values for T and E are 0.87% and 5.004%. New cutting tool and data support for the development of subsequent C.K. branch stubble equipment can be obtained with this new sliding cutter.
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