CN103071862A - Method for processing straight bevel gear without grinding tooth root - Google Patents

Abstract

The invention discloses a method for processing a straight bevel gear without grinding a tooth root. The method comprises the following steps of: (1) roughly processing a gear blank, and establishing a gear-shaping processing foundation; (2) gear-shaping processing: performing uprooting processing on the gear by adopting a gear shaping tool which contains a boss cutting edge, wherein the starting point of uprooting is close to the starting point of meshing, and the uprooting amount on a gear root transition curve is 0-0.2 millimeters larger than the grinding allowance of the gear; (3) performing carburizing heat treatment; (4) finely processing the gear and the foundation; (5) grinding teeth; and (6) checking and warehousing. The method has the beneficial effects that the gear shaping tool which contains the boss cutting edge is used for performing gear-shaping processing for uprooting the straight bevel gear in gear-shaping processing, and the straight bevel gear is subjected to tooth grinding processing, so that smooth switching of a tooth surface and a gear root transition curve is realized, a boss of the gear root transition curve is eliminated, non-grinding processing of the tooth root is realized, a pressure stress surface layer of a gear root thermal treatment surface is kept, smooth switching is realized, and the bending strength of the gear is enhanced.

Description

Straight bevel gear is the processing method of roll flute root not

Technical field

The present invention relates to the not processing method of roll flute root of straight bevel gear, belong to the gear machining technology field.

Background technology

Straight bevel gear is very extensive in the application in aero-engine field, development along with technology, the renewal of Straight Bevel Gear Drive technology, the requirement on machining accuracy of straight bevel gear is more and more higher, in order to guarantee that Straight Bevel Gear Drive has good bending strength in the aero-engine under the condition of alternation power, need to adopt roll flute processing.Because the large end of straight bevel gear and modulus and the profile of small end are all different, add man-hour at roll flute, all be to keep fillet curve boss is arranged usually, the flank of tooth operating accuracy of straight bevel gear will carry out an acceptance inspection by engagement inspection.

Existing straight bevel gear substantially all adopts the processing method of not grinding tooth root, has the switching boss at the flank of tooth and fillet curve place, and the mechanical performance of boss periphery changes greatly, tired source occurs easily, and the bending strength of gear is lower.

Summary of the invention

The object of the present invention is to provide the not processing method of roll flute root of straight bevel gear, can realize the round and smooth switching of the flank of tooth and fillet curve, eliminate the boss of fillet curve, realize the not grinding of tooth root, improve the bending strength of gear.

The objective of the invention is to be achieved through the following technical solutions: straight bevel gear is the processing method of roll flute root not, and it may further comprise the steps:

(1), the gear foreplaning base, with the machining benchmark of the tooth base after the roughing as next procedure;

(2), adjustable cast iron planes tooth base, adopt the gear-shaping cutter contain the boss cutting edge to the gear processing of uprooting, the starting point of uprooting is chosen in apart from the starting point of meshing 0.1～0.2mm place, the amount of uprooting at fillet curve place is 0～0.2mm;

(3), carburizing heat treatment, heat treatment hardness HRC 56～72, carburized (case) depth 0.8～1.2mm;

(4), the clamping datum level of grinding gear;

(5), the flank of tooth of roll flute machining gears meets designing requirement, not grinding of tooth root;

(6), check warehouse-in.

Beneficial effect of the present invention is: utilize the gear shaper cutter that contains the boss cutting edge in gear-shaping processing, the gear-shaping that straight bevel gear is uprooted is processed, straight bevel gear is after roll flute processing, realized the round and smooth switching of the flank of tooth and fillet curve, eliminated the boss of fillet curve, realize the not grinding of tooth root, kept compression top layer and the round and smooth switching on tooth root heat treatment surface, improved the bending strength of gear.

Description of drawings

Fig. 1 is for having the not large end tooth shape schematic diagram of roll flute root of straight bevel gear now;

Fig. 2 is the large end tooth shape schematic diagram after the adjustable cast iron planes tooth operation of the present invention;

Fig. 3 is the large end tooth shape schematic diagram of completion of processing of the present invention.

Wherein, the 1-flank of tooth, the 2-tooth root, the 3-fillet curve, the 4-boss.

The specific embodiment

Further describe technical scheme of the present invention below in conjunction with accompanying drawing, but that claimed scope is not limited to is described.

Such as Fig. 1, there is switching boss 4 at fillet curve 3 places in the existing processing, the mechanical performance of boss 4 peripheries changes greatly, tired source occurs easily, and the bending strength of gear is lower.

Straight bevel gear is the processing method of roll flute root not, and it may further comprise the steps:

(1), the gear foreplaning base, with the machining benchmark of the tooth base after the roughing as next procedure;

(2), adjustable cast iron planes tooth base, the gear-shaping cutter that employing contains the boss cutting edge is to the gear processing of uprooting, the starting point of uprooting is chosen in apart from the starting point of meshing 0.1～0.2mm place, the amount of uprooting at fillet curve 3 places is 0～0.2mm, such as Fig. 2, behind the adjustable cast iron planes tooth base, fillet curve 3 places should leave grinding allowance 0～0.2mm;

(3), carburizing heat treatment, heat treatment hardness HRC56～72, carburized (case) depth 0.8～1.2mm;

(4), the flank of tooth of roll flute machining gears meets designing requirement, not grinding of tooth root;

(5), after the roll flute processing, not grinding of tooth root has avoided fillet curve 3 places boss to occur, the flank of tooth meets designing requirement;

(6), check warehouse-in.

Claims (1)

1. the straight bevel gear processing method of roll flute root not, it is characterized in that: it may further comprise the steps:

(1), the gear foreplaning base, with the machining benchmark of the tooth base after the roughing as next procedure;

(2), adjustable cast iron planes tooth base, adopt the gear-shaping cutter contain the boss cutting edge to the gear processing of uprooting, the starting point of uprooting is chosen in apart from the starting point of meshing 0.1～0.2mm place, the amount of uprooting at fillet curve place is 0～0.2mm;

(3), carburizing heat treatment, heat treatment hardness HRC 56～72, carburized (case) depth 0.8～1.2mm;

(4), the clamping datum level of grinding gear;

(5), the flank of tooth of roll flute machining gears meets designing requirement, not grinding of tooth root;

(6), check warehouse-in.

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