Device and method for machining rectangular splines in hard tooth surfaces

Abstract

The invention discloses a device for processing rectangular splines in a hard tooth surface. The device is an adaptive centering device. The self-adaptive centering grinding device includes a grinding head, an adaptive steel ball, a grinding Rod, bushing and base, the bushing is installed and fixed in the inner hole of the base, the parts are placed in the positioning hole in the bushing, the top end of the grinding rod is provided with a center hole, and the self-adaptive steel ball is placed in the center hole of the grinding rod for grinding The rod matches the inner rectangular spline of the part, and the grinding head presses on the adaptive steel ball to push the grinding rod down to grind the inner rectangular spline of the part. The invention can ensure the dimensional accuracy, parallelism and positional degree of the inner rectangular spline.

Description

technical field [0001] The invention relates to the field of aero-engine transmission bevel gear processing, in particular to a device and a processing method for processing rectangular splines in hard tooth surfaces. Background technique [0002] An aviation zero-degree spiral bevel gear is equipped with an inner rectangular spline, requiring positional degree ≤ 0.015mm, parallelism ≤ 0.01mm and slot width Inner rectangular splines are always deformed during cyanidation quenching, such as bell mouth and groove width narrowing. It is difficult to effectively control the deformation law, which affects the accuracy of the spline position and the uniformity of the groove width allowance. [0003] Due to the limitation of structure or size, the bevel gear cannot be ground with the inner rectangular spline by the forming gear grinding machine. Because the inner rectangular spline on the hard tooth surface is manually ground and corrected, there is uneven grinding amount, which a...

AI Technical Summary

Problems solved by technology

[0002] An aviation zero-degree spiral bevel gear is equipped with an inner rectangular spline, requiring positional degree ≤ 0.015mm, parallelism ≤ 0.01mm and slot width Inner rectangular splines are always deformed during cyanidation quenching, such as bell mouth and groove width narrowing, and the deformation law is difficult to effectively control, which affects the accuracy of the spline position and the uniformity of the groove width allowance

[0003] Due to the limitation of structure or size, the bevel gear cannot be ground with the inner rectangular spline by the forming gear grinding machine. Because the inner rectangular spline on the hard tooth surface is manually ground and corrected, there is uneven grinding amount, which affects the groove width and keyway position The uniformity of the spline is easy to cause the horn hole. Therefore, after standard repair and manual grinding by conventional methods, the high-precision requirements of spline uniformity and groove width cannot be met.

[0004] There is no standard for the shape error of the existing internal rectangular spline tooth shape correction and testing tooling, and its shape tolerance does not match the groove width tolerance, so that the effective training allowance for the inner rectangular spline groove width of bevel gears is extremely limited, seriously affecting the groove width size Therefore, existing tooling (including grinding mandrels, gauges, etc.) cannot meet the detection and processing requirements of high-precision spline uniformity and keyway size

[0005] Therefore, if ordinary broaches are used to position and broach inner rectangular spline tooth grooves with inner holes, and the parts are subjected to cyanide quenching and manual grinding, the inner rectangular splines cannot achieve the required dimensional accuracy and shape accuracy.

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