Reasonable application of the boundary range of the common knives, pre-calculation of the relative depth of cut c/m of the effective section of the tooth profile, the ratio and the original gear (z1 = 1523) and the driven gear (z2 = 6575) at z1 z2 = 83 The profile offset coefficient x is related.
As shown in Fig. 2, the normal reference tooth profile of the arc-shaped protruding blade is high, and the original profile top is high and the full tooth height is rounded; the height of the non-deformed tooth (hao-hn) only guarantees the effective profile of the tooth. The tooth shape is divided into three parts, one is a linear toothed portion having a tooth angle of 0, that is, the ab segment tooth shape in the figure, and the non-deformed profile angle of the blade is 0=20, which is the tooth of the general gear blade. The shape is the same; the second is the arc of the tooth top with radius rc, which is used to cut the curve of the groove bottom of the gear; the third is the tooth shape between the two, that is, the connecting line of the above two parts, this part of the line should be inclined n=710 or so, so that this blade has the necessary caster angle. Applying the principle of the normal component conjugate profile small deviation equation, it can be considered that the root cutting depth is equal to the original shape profile protrusion value n, and the conditional application range is as shown in the shaded portion.
The c/m curve of z2=6575 is in the range of x<0, so when cutting the root, the number of passive teeth z270, x>0, n0.07m, can be processed by ordinary protruding knives; at n0.07m, active The wheel x0.8 can also be processed with a knife. When x<0.5, n0.055m, the driving wheel should be machined with a circular head tool. This tool is designed according to a simple analytical relationship.
For uniformly loaded blade teeth, it is recommended to use the number of protruding teeth zn and the ratio of the number of cutting grooves zn0 (znz0) is less than or equal to 0.07, ie znz00.07, and the relationship between zn and z0 can also be used to simplify the cutting of the tool. Onboard installation. The main parameters for the original shape of the passive gear are determined by the full rounding of the tooth tip and the condition of 0=20. In fact, in this case, hao = (1.31.4) m, the original profile of the driving gear is determined by the conditions n = 78 and hao (1.41.48) m. The tool material designed according to the proposed method is used to process the gear parameters studied: n=0.027m, the driving gear: m=11mm, z1=15 and x=0.8; passive gear: m=11mm, z2=68 and x =0.42. Case studies have shown that the shape of the transition curve is reasonable. At z1=1523, and n=0.035m, the bending strength of the tooth is increased several times compared with the conventional tool.
The practice of applying a protruding tool shows that its value n should be determined by the condition nw, which is the maximum cutting value given on the figure after grinding, see the value of w.
The parameter calculation with the round head gear is calculated. The crankshaft radius 1 of the driving gear can be smaller than the radius given on the driving gear working diagram. The difference between the two is 1 and can be determined for z1=1523. In this way, the diesel engine transmission series calculation results AB blade tip radius / mm () 1 [0.5sno1-(ha0-hn)1tan02 2 (1-sinn2); hao21.4m12.9607413.22494 Note: t0 is the original shape on the broken section Profile angle of the profile; is the skew angle of the tooth line; tw is the transmission mesh angle; db is the diameter of the base of the gear; ta is the profile angle of the diameter of the top of the broken section; p is the radius of curvature of the bottom of the effective profile; Aw is the transmission shaft spacing; tp is the effective profile angle of the bottom section of the end section; dp is the circumferential diameter of the bottom point of the effective profile of the tooth; Awme is the effective deviation of the average length of the common normal.
For a batch of gears that are machined with the same modulus as a tool, check the following formula. (hao-hn)hao-hnh>nsh-sno0.02mh For the processing of a batch of gears, the final dimensions of the tool are accurately calculated. The manufacturing of the protruding blade material uses the forming wheel to process the edge of the blade tooth to ensure the height and roughness behind the blade. For gears with a precision of not less than 8 grades, the protrusion surface is not scratched and wave-shaped, and the shape error is less than 0.05 mm; The existing section profile angle n is reduced, which increases the incompleteness of the machining behind the blade teeth, and a saddle-shaped recess is formed behind the blade, and a corresponding inspection must be performed.
Conclusion In the case of small cutting, protrusions are formed on the transitional tooth surface because the protrusion value is reduced and the grinding allowance is too large. In order to eliminate this disadvantage, the cutting of the first driven gear with a new knives should be checked, as shown. When machining the driving gear, the blade is determined by the protrusion. When the other conditions are the same, the life of the protruding blade is reduced by 20 compared with the standard tool. For m=10mm, the tooth thickness and the finishing allowance are not more than 2mm, the feed amount is s1.25mm/r, and the speed v= 20m/min, according to the method proposed in this paper, the design of the tool is calculated to ensure the surface roughness of the gear transition Ra1.25m. The blade with arc-shaped protrusion structure is applied. Under the same conditions, the transition surface roughness is reduced to Ra0. .63m.
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