Page 34 - Станочный парк английская версия

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the transition curve ρf * = c * / (1-sinα), cutter: for processing an external tooth
except when ρf * = 0 (there is no rounding 4 <= z01 (02) <= 9999; for treating the
of the tooth head of a rack-type tool); internal tooth 4 <= z02 <z2;
modification parameters when machining ● for helical gearing: nominal tilt
with a rack type tool (only for the module angle of tooth gearwheel cutter β0 is equal
m> = 1 mm): to the angle of inclination of the teeth in the
● modification height coefficient 0.001 transmission β;
<= hg * <= 0.45; ● coefficient of the height of the head
● coefficient of depth of modification of the cutter ha0 * = hf * SC;
0.001 <= Δ * <= 0.02; ● when the gearwheel cutter sets one
● the coefficient of blunting the of the angles of the tooth involute νk0, νr0,
longitudinal edge of the tooth of a rack- νq0 νa0,> νk0> νr0> νq0> νl0;
and-pinion tool is 0.001 <= hk * <= 0.15 ● data whose values can be
(for the module m <1 mm), 0.001 <= hk * represented by positive numbers with a
<= ha * (for the module m> = 1 mm); fractional part: 0 <... <= 999999.999;
● bias factors x1 and x2. If they are ● with negative numbers with
specified, then the coefficient of the sum a fractional part, only displacement
(difference) of the displacements calculated coefficients x1 and (or) x2 can be
from the given values of x1 and x2 must be represented. Their values are controlled as
greater than the minimum value at which described above. The program checks the
the gearing angle αtw = 0º (for external validity of the input data by their form, the
gearing, the value αtw = 0º is formal, since range of acceptable values, and the validity
the main circles of the gears and wheels of the combination. If errors are detected
touch each other and the involutes of these during the verification, the program displays
circles are not mutually conjugate); the appropriate messages on the monitor
● center distance aw. If it is specified, screen. After checking the initial data, the
then aw> = awmin1, where awmin is the program proceeds to the calculation of
minimum possible axle distance calculated the geometrical parameters of the gear
by the program, determined by the zero determined by the obtained initial data.
gear angle αtw = 0º (for gears of external The calculation is in dialogue mode. The
gearing, the value αtw = 0º is formal, since program displays on the monitor screen:
the main circles of the gear and wheels ● requests for input of additional
touch each other and the involutes of these initial data (for example, a request for input
circles are not mutually conjugate); of the gear displacement coefficient with
● width of the gear rim (wheel) the values of the minimum displacement
0.001> = b1 (2) <= 999999.999 mm; coefficients xmin for the gear and wheel in
● working crown width (if specified) the gear for a given axle distance aw);
bw <= min (b1, b2); ● informational messages (for example,
● gear rotation speed (if some about the calculated values of the diameters
geometric parameters are used to calculate of the dividing d, main db, boundary points
the strength gears) 0.001 <= n1 <= dl of the vertices da of the gear and wheel)
999999.999 rpm; The functionality of the program is
● coefficient of minimum radial expanded by calculating the diameter of
clearance 0.05 <= cmin * <= c *; the boundary points dl of the tooth profile
● when specifying the processing for gears and wheels with an external
of the gearwheel cutter, the module of tooth when cutting (when the specified
the gearwheel cutter m0 is equal to the displacement coefficient x <xmin). In the
transmission module m; standards, GOST 16532-70 and GOST
● number of teeth of a gearwheel 19274-73 there are no formulas for

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