Design of tool rest without carriage for the hotte

2022-08-21
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Micro motor rotor lathe tool carriage design without small carriage

rotor finishing turning equipment is used for finishing turning of micro motor rotor and commutator. The large and small carriage and tool carriage on it are generally not classified as non-destructive testing class 1. The structure and action principle are similar to that of profiling lathe. The difference is that the feed position of the former is adjusted according to the diameter of turning rotor, and the feed position cannot be changed during turning. Its maximum longitudinal feed stroke is generally 50mm, which can only be used for smooth turning, and cannot be used for turning steps. The maximum cutting depth is 0.30mm. The action sequence of its cutting is:

and Ryazan region in the Far East of Russia. When the author designed this kind of lathe in the Shenzhen factory of Duracraft company in the United States, according to the specific situation of this factory, the tool holder and small carriage were transformed on the basis of analyzing the turning characteristics of this kind of lathe. When analyzing the characteristics of this kind of lathe, it is found that for the processing of a batch of rotors with the same size, each rotor has longitudinal feed and withdrawal actions. When turning small diameter rotors, the longitudinal feed time is longer, and the cumulative time for mass production cannot be ignored. Taking advantage of the characteristics of this kind of lathe, which only turns smooth surfaces and has a small cutting amount, the small carriage is canceled in the design, and there is no longitudinal feed during turning. In order to solve the problem of tool yield during tool withdrawal, a low head tool yield carriage is designed to replace the original small carriage and carriage, and its structure is shown in Figure 1

1. Rotor 2 Turning tool 3 Tool rest 4 Spring 5 Coil 6 Electromagnetic tool holder 7 Tool rest positioning knob 8 Carriage 9 Base 10 Pin shaft 11 Rotor support

Figure 1 Schematic diagram of the structure of the tool rest

by lowering the head of the tool rest, the longitudinal feed and withdrawal time of each turning can be saved. For each batch of rotors with different diameters, the tool rest positioning knob 7 can be adjusted to determine the turning size. When turning a batch of rotors, test several rotors at the beginning and lock the tool rest base 6 after reaching the accuracy requirements. When turning, the coil 5 is powered on, the tool rest 3 is attracted by electromagnetic force, swings horizontally with the pin shaft 10 as the center, and the carriage 8 moves horizontally; When the equipped computer turning tool 2 moves out of the width of the rotor 1, the coil 5 is powered off, and the tool holder 3 lowers its head under the action of the spring 4 to restore the tool to its original position, the large tractor will reach more than 5% of the total demand of the automobile market, and the plate 8 will horizontally retract the tool and return to the starting position. The action sequence is:

when the tool holder lowers its head to let the tool, the arc surface of the rotor and the rear angle of the turning tool are used, and the tool can be let by swinging about 10 °; The main cutting force and electromagnetic force form a couple, which makes the tool holder more reliable during turning. After removing the small carriage and changing to let the tool rest, the processing time is reduced because there is no longitudinal feed and withdrawal action. For medium diameter φ The machining time of 65mm rotor is reduced by 15%. The machining accuracy is also slightly improved. Tested: rotor diameter φ 65mm, 64 test pieces in each group, a total of 3 groups, processed with the tool rest, and the mean square deviation of dimensional error σ 1=0.00329; Machining with original lathe tool rest, mean square deviation of dimensional error σ 2=0.00347。 Both of them can meet the accuracy requirements of it7. The reason for the slightly higher accuracy of the former is that the equivalent stiffness produced by the rigidity of the knife rest pin and the electromagnetic suction force is higher than that produced by the hydraulic pressure positioning of the original lathe using 10 times the cutting resistance, and the latter is prone to deformation of the small carriage under heavy force. (end)

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