Hob complete utilization integrated gear hobbing method

Abstract

A hobbing method for comprehensive utilization of hob; the relative position of the hob and workpiece can be calculated according to the parameters of processing gear and hob before hobbing; a certain distance h can be kept between the intersection point of the hob shaft central line and hob end face and the workpiece end plane; the intersection point of the hob end face and the hob external diameter generatrix aim at the workpiece axis center as the penetration point to implement radial intermittent hobbing, angle complete gear hobbing, angle hobbing full gear width processing and axial hobbing full gear width processing; The present invention integrates the advantages of original axial, radial and angle hobbing methods and overcomes the defects; in this way, the present invention solves the problem that the idle hobbing distance of the axial gear hobbing is prolonged and the production efficiency is reduced because of the increased external diameter of the hob. In this way, the incomplete gears on the two end faces of the hob can be fully utilized and the production efficiency and the hob service life are increased; with the present invention, the hob fretting is even; the production cost is reduced; in addition, the present invention provides a feasible processing technology for choosing large-external diameter, high-precision, high-efficiency hob processing gear which is not seriously fretted; the method can be conveniently implemented on numerically-controlled hobbing machine.

Description

technical field [0001] The invention relates to a method of using all the teeth on the hob to process gears, in particular to a comprehensive gear hobbing method which fully utilizes the incomplete teeth at both ends of the hob. Background technique [0002] Gear hobbing is the most widely used gear processing technology at present. The hob is the most important process equipment to realize gear hobbing. Because the teeth at both ends of the hob are incomplete, it cannot envelop a complete and effective tooth shape, so It has not been used in the past processing technology, which has been included in the textbook. The textbook emphasizes that only the complete and effective L of the hob's total length L can be used. 1 part, to completely avoid the use of incomplete L 0 Part, so as not to cause the tooth profile error of the processed gear and scrap the product, as shown in Figure 1 and Figure 2. 3 in Fig. 2 is the incomplete tooth on both ends of the hob 1. [0003] The a...

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Problems solved by technology

[0005] The processing method in which the hob 1 feeds in the direction shown by the radial direction fr of the workpiece 4 to be processed is called radial hobbing, as shown in Figure 4, although there is no problem of empty cutting distance, it can be said to be the most efficient method. However, this method cannot cut out the full tooth width, and from the beginning of cutting to the full tooth depth, the cutting resistance will increase exponentially, which is unfavorable for the control of the feeding process and the control of the product precision, and has great limitations. , when used alone, it can only be used to process worm gear products with low requirements

[0006] The hob 1 not only feeds in the direction indicated by the axial direction f of the workpiece 4, but also feeds in accordance with the axial direction f of the hob. 1 The processing method of feeding in the direction shown is called angular hobbing. As shown in Figure 5II, this method has uniform hob wear, good surface quality of cutting teeth, and improved working stability and precision of gear transmission. However, this method increases hobbing The axial movement of the knife increases the complexity of the equipment and the difficulty of process adjustment, and increases the tooth error during gear hobbing. Affected by the above factors, this more advanced gear hobbing method has not been popularized.

[0007] The above-mentioned processing methods have their own advantages and disadvantages, but because the incomplete teeth at both ends of the hob have not been used, the utilization rate of the hob is low and the service life is short, resulting in waste of resources and increase in production costs

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