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The elliptical cylinder gear is machined on the bed.
3. Calculate the actual indexing arc long center, there are two connecting holes to be drilled, the workpiece with =37 teeth through 2 pins, practical 20 teeth, 20 teeth on the indexing arc length = mZi丌X Through the above calculation, the sum of the round lengths of the four-segment arcs is smaller than the sum of the actual index circle lengths, and the error is 0.649 mm. In the error, the number of teeth is rounded to 20, 21, and the gear parameters are calculated as 195.5, 21.5. It should be noted that there may also be a half tooth division when actually milling the tooth, which is because of the segment milling tooth. The last formed tooth can belong to Zl or Z2, so the calculation error is the same whether it is the whole tooth number or the half tooth number. The result is the same and will not be calculated here. Through analysis, the correction of the modulus can eliminate the error, because the modulus 3.03 is corrected, not the standard modulus. Through repeated calculations, it is more reasonable to set the modulus to 3.025.
=3.025, the length of the arc of the four-section circular arc is: in order to make the elliptical shape coincide with the outer circle of the elliptical tooth tip, a set of milling and milling can be designed and fabricated on the end mill. The upper milling cutter is shown in the form of a horizontal milling and milling centering plate to form a whole. The centering plate also has four positioning holes to be drilled with the rotating shaft. When milling, each clamping is changed once. A positioning hole.
The taper sleeve 9 is used for milling the shape on a rotary table.
After clamping the elliptical gear blank, you can select two 3.025 modules of No. 3 and No. 4 milling cutters for milling. Due to the segment milling, the last tooth of the first segment of the arc tooth is also the first tooth of the second segment of the arc tooth. Therefore, when the second segment of the arc tooth is milled, it is necessary to re-clamp and set the tool. This is done by lifting the rotary table and the rotary motion of the indexing head. The tooth shape of the piece 7 can be used to align the tool to avoid damage to the workpiece. The milling accuracy of an elliptical gear is determined by the error of each segmented tool. Practice has proved that the above-mentioned clamping and tool setting can meet the quality requirements.
The gear caliper can be used to measure the chord height and the chord thickness separately. The common normal micrometer can also be used to measure the length of each arc tooth common normal, which is the same as the ordinary gear measurement method. The key is how to measure the length of the common arc of the different arcs, how to calculate the common arc of the different arcs, and no theoretical basis has been found yet. Its error actually reflects the error of the tool. During milling, it has been found through repeated experiments to find the rotation angle with the smallest tool error. It is realized by the indexing head. The two gears machined by this milling method finally meet the quality requirements and meet the needs of customers.
The requirements are higher. It has 4 centering holes on it. The circle with four arcs is more readable. Please tell us what you think about this article. University Pong Marking Machine book6 This article number 12-28