A kind of method improving wheel disc part outer tongue-and-groove broaching precision
Technical field
The invention belongs to aircraft engine parts manufacturing technology field, be specifically related to a kind of method improving wheel disc part outer tongue-and-groove broaching precision.
Background technology
In traditional wheel disc part outer tongue-and-groove broaching process, be positioned by unique axial benchmark, radial reference and angle benchmark, cylindrical tongue-and-groove of broaching successively.This processing technology is simple to design of part, and the wheel disc part not affecting positioning fixture rigid design can ensure tongue-and-groove broaching precision.And for the more complicated part of structure, the wheel disc part of restriction positioning fixture rigid design, according to a conventional method after broaching tongue-and-groove, between part upper tenon groove, area is very little, only have locating surface and the holder contacts of small size, site error accumulation simultaneously between tongue-and-groove, after causing difficult positioning turntable part broaching tongue-and-groove, part deformation is comparatively large, and size is difficult to ensure.
Summary of the invention
In order to overcome the defect that above-mentioned prior art exists, the object of the present invention is to provide a kind of method improving wheel disc part outer tongue-and-groove broaching precision, after the method effectively can solve and cause broaching tongue-and-groove because of wheel disc part positioning fixture poor rigidity, part deformation tongue-and-groove precision is difficult to the problem ensured.
The present invention is achieved through the following technical solutions:
Improving a method for wheel disc part outer tongue-and-groove broaching precision, is the cylindrical process area being provided with several angle locating slots on wheel disc part outer to be processed;
If the tongue-and-groove number of wheel disc part outer to be processed is even number, then justifies outside on process area and two angle locating slots are set, the tongue-and-groove of wheel disc part of having broached at twice; If the tongue-and-groove number of wheel disc part outer to be processed is odd number, then justifies outside on process area and three angle locating slots are set, divide the tongue-and-groove of wheel disc part of having broached for three times.
If the tongue-and-groove number of wheel disc part outer to be processed is even number, then with first angle locating slot location, the tongue-and-groove of odd bits of first broaching, and then locate with second angle groove, the tongue-and-groove of broaching even bit.
If the tongue-and-groove number of wheel disc part outer to be processed is odd number, then with first angle locating slot location, first groove of first broaching, then with second angle locating slot location, the tongue-and-groove of broaching even bit, finally with the 3rd angle locating slot location, the odd bits tongue-and-groove of broaching except first groove.
Calibration is carried out by the tongue-and-groove sum that wheel disc part is to be processed during broaching tongue-and-groove.
Described calibration refers to: during broaching tongue-and-groove, the angle between several angle locating slots of setting is 360 °/tongue-and-groove number; Wherein, tongue-and-groove number is the tongue-and-groove sum of wheel disc part outer to be processed.
Compared with prior art, the present invention has following useful technique effect:
The present invention adopts Excircle machining platform to realize the axial location of part on wheel disc part outer to be processed, can prevent the part when broaching tongue-and-groove from rotating on fixture, once broach in an angle location of Broaching Technology in prior art always being continued to use, be adjusted to two (or three) angles location twice (or three times) tongue-and-groove of broach to process, namely tongue-and-groove in two batches (or three batches) broached.This method is after the 1st angle location broaching, part increases 2 times with broaching fixture location area than the location area of all tongue-and-grooves of once having broached in prior art, improve the stability of fixture location, decompose the part angular displacement that the angle component that produces due to broaching causes simultaneously.The inventive method is simple to operate, designs ingenious, can greatly strengthen fixture rigidity by this method, reduces the rear part deformation amount of broaching, improves parts size precision.
Further, the present invention carries out calibration when broaching tongue-and-groove by the tongue-and-groove sum that wheel disc part is to be processed, namely during broaching tongue-and-groove, angle between adjacent angle locating slot is 360 °/tongue-and-groove number, tongue-and-groove number regardless of wheel disc part outer to be processed is odd number or even number, and the setting of angle locating slot angle can ensure that the tongue-and-groove of broaching out is uniform at wheel disc part outer.
Accompanying drawing explanation
Fig. 1 is fan wheel disc part of the present invention location schematic diagram;
Fig. 2 is the tenon groove structure schematic diagram that fan wheel disc part of the present invention is broached out;
Fig. 3 is fan wheel disc part of the present invention two angle locating slot structural representations.
Fig. 4 is the schematic diagram that fan wheel disc part tongue-and-groove of the present invention distributes on part outer.
Wherein, 1 is angle locating slot; 2 is tongue-and-groove locating surface; 3 is endoporus; 4 is tongue-and-groove.
Detailed description of the invention
Below in conjunction with concrete drawings and Examples, the present invention is described in further detail, and the explanation of the invention is not limited.
A kind of method improving wheel disc part outer tongue-and-groove broaching precision of the present invention, adopt the design of cylindrical process area, fixture radial thickness can be increased, strengthen rigidity, adopt two (or three) angle locating slots, by twice (or three times) clamping, broaching, increase fixture circumference position length, further enhancing fixture rigidity, by tongue-and-groove in two batches (or three batches) broached:
If the tongue-and-groove number of wheel disc part outer to be processed is even number, i.e. available first angle locating slot location, odd bits tongue-and-groove of first broaching, then with second angle groove location, broaching even bit tongue-and-groove;
If the tongue-and-groove number of wheel disc part outer to be processed is odd number, then with first angle locating slot location, first groove of first broaching, then with second angle locating slot location, the tongue-and-groove of broaching even bit, finally with the 3rd angle locating slot location, the odd bits tongue-and-groove of broaching except first groove.
No matter the tongue-and-groove number of wheel disc part outer to be processed is odd number or even number, during broaching tongue-and-groove, total index dial calibration must by groove number calibration, namely during broaching tongue-and-groove, the angle between several angle locating slots of setting is 360 °/tongue-and-groove number; Wherein, tongue-and-groove number is the tongue-and-groove sum of wheel disc part outer to be processed.
To broach 24 tongue-and-grooves for the first order fan wheel disc of certain engine below, set forth the method for raising wheel disc part outer tongue-and-groove of the present invention broaching precision:
1) test block is placed on fixture, locates and compress rear broaching 1 tongue-and-groove, the grooved of this tongue-and-groove of projection check;
2) after checking that grooved is qualified, test ring is placed on fixture, and pushes down test ring with gland, after centering, gland is compressed, broach to point two groove, projection check tongue-and-groove radius and side-play amount;
3) after passed examination, cylindrical process area is placed on fixture, with the angle locating slot location of on cylindrical process area, and pushes down cylindrical process area with gland, gland is compressed, 12 tongue-and-grooves of broaching odd bits; See Fig. 1, comprising level Four location, 1 is two adjacent angle locating slots, and 2 be the locating surface between the tongue-and-groove of broaching and tongue-and-groove, and 3 is radial location endoporus, mainly plays a supportive role; 4 tongue-and-grooves for broaching out; Fig. 2 is the tenon groove structure schematic diagram of broaching out; Fig. 4 is the schematic diagram that fan wheel disc part tongue-and-groove of the present invention distributes on part outer.
4) gland is unclamped, (angle between two angle locating slots is 360 °/24=15 ° cylindrical process area to be rotated 15 °, see Fig. 3) after, with the another one angle locating slot location on cylindrical process area, and push down cylindrical process area with gland, after centering, gland is compressed, 12 tongue-and-grooves of broaching even bit.
After having broached, check the size of first order fan wheel disc, form and position tolerance and technical conditions, met the wheel disc part of designing requirement completely.