Suzhou Gold ant Precision Sheet Metal Co.,Ltd , https://www.jmysheetmetal.com
(Continued) name generation and if-n formula large tooth root angle pain dc-5in; l; ll~ K and other tooth tip clearance shrinking tooth apex angle n unequal m gap contraction tooth Hictari~~~ If Shrinking tooth tip cone angle heart = 丨 1 + heart = + (not equal to the top of the tooth between the tooth top round box angle RcsSi - big end indexing arc tooth thickness tmirm S: = T big end indexing chord thickness S has a pair Straight bevel gear, the angle between the two shafts is 90, the modulus is m=4mm, the number of teeth of the small gear is S1=32, the number of teeth of the large gear is 22,40, and the width of the tooth surface is i=the size of each part of the small wheel.
Straight bevel gear (commonly known as straight bevel gear), which is used to transmit the rotary motion between two intersecting axes. The angle between the two axes is usually 90 (but also less than or greater than 90). For bevel gears with high precision requirements, they are usually machined on a special gear shaping machine. Straight bevel gears with general requirements for precision are usually formed on a conventional milling machine with a parting cutter and part of the name and basic dimensions. The tooth profile is gradually contracted from the big end to the small end, that is, the big end of the wheel. The modulus of the big end is standard modulo. Calculation of the name and basic dimensions of the straight bevel gears (see and Table 1 Straight bevel gear size calculation name calculation formula small wheel big wheel section cone angle art = 袱 n n 2 speaking time division circle 1 diameter row: distance tooth width tooth Top high tooth 椴 high tooth full height big end tooth tip straight and the number of equivalent gears of the machined gear z straight bevel gear actual tooth number 5tt bevel gear section taper angle processing always bevel gear m= 3, z=39, 3= 45. The number of milling cutters u should be selected with a pair of straight bevel gears, the angle between the two shafts is 2 = 75, the pinion gear A=15, the large gears are skillfully = 60, and the number is 3, and there is a pair of straight bevel gears, two Axis angle 2 = 100% pinion gear number = 15, large gear tooth number z2 = This shows that the 39 tooth straight bevel gear tooth shape is equivalent to the tooth profile of the 55 tooth spur gear, the table shows that the modulus should be 3 No. 7 bevel gear milling cutter (standard disc wheel milling cutter y-number table can be found in one side manual) 3. Straight bevel gear milling process (1) Indexing head and workpiece installation first indexing head Installed on the milling machine table, the indexing head spindle should be parallel to the longitudinal table top and the turning plane of the milling cutter. Then insert the mandrel taper into the indexing head spindle hole屮After the correction, tighten with the tie rod bolts, and then install the tooth blank. Pull the indexing head to an angle, that is, the cutting angle (root taper angle W root angle, (°) (2) select the milling edge and install according to the number of teeth of the machined gear And the taper angle meter 2. Straight bevel gear milling cutter and its selection The general straight bevel gear is designed according to the large end tooth shape, but in order to ensure that the blade can pass the small end during the machining process, the knife The width of the tooth must be designed according to the width of the small end slot, so the bevel gear milling cutter is much thinner than the spur gear milling cutter of the same modulus. The width of the standard bevel gear milling cutter is the radius of the pitch cone and the tooth. The width ratio of the small end is zyi>=3, so it can be applied to the bevel gear processing of 1/4>3 (generally the straight bevel gear i/fc is equal to 3).
Standard straight bevel gear milling cutters are also made in 8 or 5 sets (the same as spur gears) according to the modulus. Straight bevel gear milling cutters are printed with i" marks, but care must be taken to select the bevel gear milling cutter number. The number of teeth on which the number is based is not the number of teeth of the machined gear. The number of teeth is calculated to select the number of cutters. The cutter is mounted on the toolholder, and the tool is centered by scribing and trial milling.
(3) Adjusting the milling depth In the middle of the milling groove, after the end of the tool setting, all the straight tooth tips are milled according to the large end modulus of the gear and milled to the full tooth depth U=2.2m.
<4) Both sides of the milling groove are shown on the left side of the milling end as shown in Fig. 3. First press the a arrow to move the table to a distance of 5 (called lateral shift amount) =, the lateral shift amount s of the sitting metaphor and then press the b arrow to ask the rotary indexing head (for the table to move the cone radius - tooth width The radius of the taper is opposite to the direction of rotation of the indexing head, so that the left edge of the milling cutter just mills a knife (c) to the left of the small end slot. Immediately measure the tooth thickness of the big end with the gear aglycone. The size at this time (the thickness of the big end tooth after the straight groove is opened - the tooth thickness required for the pattern) + the pattern requires the tooth thickness. If there is still a margin, you should turn the indexing head one or two holes and then iron it once. When milling the big end of the big end, the S value of the upper elbow movement and the indexing head rotation value are doubled in the opposite direction.
(5) Straight bevel gear measurement Generally, the operator usually only performs the tooth thickness measurement. The measurement of the tooth thickness refers to the measurement of the indexing circle chord tooth thickness. Conventional is the measuring cone it is a wheel cone. h The tooth thickness of the big end of the gear. If the gear usage requirements are high, the tooth thickness of the small end of the gear should be measured.
Straight bevel gear indexing circle chord tooth thickness calculation formula, in addition to the formula introduced in Table 1 of this paper can also be calculated by the formula of the indexing circular chord tooth thickness, it should be noted that the number of common gear teeth is replaced by the equivalent number of teeth.
The straight bevel gear is indexed by the circular chord tooth thickness, and can also be directly calculated in the commonly used cutting manual according to the modulus of the gear and the calculated equivalent tooth number.
4. Straight bevel gear with a knife forming method of iron cutting The method described above, generally using three-knife milling forming method = here again introduces a use of reduced cutting angle A (ie root cone angle), slightly deeper Large and small end teeth are deep, and a straight bevel gear is formed by a single knife. Its profile and strength are unaffected.
The calculation formula of the cutting angle and the (root cone angle) by a knife forming method: 5f-one "cutting angle" of the two-blade forming method, (°) 9-tooth root angle, (°) b K~ by straight teeth Bevel gear large end standard indexing knurl thickness to measure the tooth tip of the tool, mmK according to the small end of the straight bevel gear small end standard rounding tooth thickness to measure the tip height of the tool, mm (this is to calculate the small end mode Number) R-cone radius, mm Example 5 It is known that a standard straight-toothed bevel gear m seeks a cutting angle when using a knife plus forming method.
Big end: According to the calculated number of equivalent teeth, the gear caliper level is adjusted to 3.57. The stomach is measured: hi=2.94mm. The cutting angle when machining with the three-knife forming method should be the formula for the above data, that is, one force. The cutting angle at the time of forming and adding I is: the cutting depth of the cutting angle is about 0.3 mm than that of the normal normal tooth, and the formed straight bevel gear is machined by a single knife or M. (M9991217) Hanging Workers (Cold Plus