Essay About 40Xdeaf4.1 Determination Of The Cutting Optimization Criterion And Roughness Length Drillingmaterial Blanksdescription Of The Hole

Drill Calucation
4 Calculation of cutting conditions for drillingTask. For given conditions of processing holes calculate optimum cutting conditions for drillingTable 4.1-Initial data for calculating the cuttingThe dimensions of the hole, precision cutting, setting and roughness length drillingMaterial blanksDescription of the hole∅D, mmRa, mlmm9H125.04Steel 40xDeaf4.1 Determination of the cutting optimization criterion for drillingTreatment mounting holes with precision size IT12 traditionally carried out drilling. With increased requirements for precision processing of drilling holes in solid material or reaming holes are pre-treated rough stage (the first technology transfer) processing of internal surfaces final treatment precision IT7-IT10 and roughness parameters Ra = (10 1.25).For optimization criterion rough stage machining cutting performance taking conventional process, which is given by:              P = 1 / It → max(4.1)The maximum value of the performance achieved provided              Then→ min(4.2)The main drilling given by:            [pic 2](4.3)lhi – stroke length of the tool; n-frequency spindle, rev / min; So- traverse mm / rev, and the number of working-moves (drilling, reaming). In turn, the spindle speed is given by n = 1000V / (π D), and the number of job moves by the formula; i = zomax / h. With this in mind we obtain the formula:                 [pic 3](4.4)              where [pic 4]      Obtain such final dependence for determining optimization:         It → min(4.5)h → max; S → max; V → maxAccordingly, it is necessary to determine the maximum value of elements of cutting mode for drilling in accordance with the conditions specified processing4.2 Formation and initial data analysis4.2.1 Analysis of the quality characteristics of the hole that must be processedIn accordance with the objectives necessary to consistently handle a through hole ∅9Н12; surface finish roughness parameters Ra5,0; drilling length l = 4mm in the workpiece, which is made of ductile steel 40Х.