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The main points of the blank machining are: (1) The blank is drawn across the line. Taking the center of the gear as the reference, the three-hearted line and the eccentric outer circle are drawn. 10:8: The egg processing line and the tooth top round processing line ensure that the machining allowance of each part of the eccentric gear is evenly distributed. (2) When roughing the front rough car, it is allowed to leave black skin locally, and the outer circle of the car is required to see the light and the end face is flat. (3) Before the quenching and tempering, the semi-finished car should ensure sufficient margin for each part of the eccentric gear to compensate for the deformation of the heat treatment and leave the finishing allowance. After the semi-finished car, the remaining diameter is 30, and the end face has a remaining amount of 20. (4) When the tooth blank is finished, the tooth top circle, the inner hole and the base surface should be driven out in one clamping to ensure the radial runout and end face runout requirements of the tooth top circle.
The tooth cutting process plan has high requirements for the accuracy of the eccentric gear, and the empty sipe is particularly small. The machining is usually done by combing the teeth on a Mage insert using a helical toothed comb.
However, a heavy company does not have a Magog plug-in, and there is currently no tool factory in China that produces a helical toothed cutter. The price of a comb cutter purchased from abroad is very expensive.
It has the greatest influence on the width of the empty sipe. Therefore, when designing the gear hob, the outer diameter D of the hob must be applied. And the effective length 2 is limited. (l) According to the strength of the hob and the accuracy of the gear, the outer diameter of the hob is designed to be the minimum value. The diameter of the outer diameter of the coarse and fine cutting hobs is 120. (2) The effective length of the hob is short. The rough-cut gear hob has only one full tooth, and the fine-cut gear hob has four full teeth. (3) The hob should be designed to be left-handed and right-handed. Use a left-handed hob to roll the left-handed tooth and a right-handed roll to cut the right-handed tooth to reduce the hob mounting angle. (4) One end of the rough cutting hob is designed as a cutting cone.
Fine cutting tooth processing technology (l) select high precision machine tools, such as ND-5, RF40/50, 5342 hobbing machine. (2) Use small diameter AA grade fine-cut hob to cut the teeth to ensure the accuracy of the tooth shape. (3) Hob cutter bar alignment accuracy.
The main measures for processing the eccentricity reference are as follows: (1) The MZP2800/80 CNC overpass milling machine is used for the machining machine, which has high processing precision. (2) Correction accuracy of workpiece clamping: Find the positive end face jump amount according to the base surface is not more than 0.02, and make the eccentric center line parallel to the Y axis of the machine tool.
The phase measuring instrument has a lower spherical plug in the reference tooth groove, and the positioning surface of the phase measuring tool is strict with the gear base surface. The detection method of the offset error is: using a special inspection tool, the steel ball at the lower end of the inspection tool is placed in the tooth groove of a certain number of teeth and the distance between the left and right sides of the reference tooth groove, and the dial indicator on the inspection tool is respectively eccentric. On the arbor of the center of the reference hole, the difference between the left and right ends of a dial gauge is 2.46.