阅读说明：本技术 航空发动机九级篦齿盘均压孔锪孔刀具及锪孔方法 (Reaming cutter and reaming method for nine-stage slotted disk pressure-equalizing hole of aircraft engine ) 是由 高明 谢东 王建飞 张容珲 曾书林 张彦博 黄向荣 方洲 杨海东 于 2020-07-08 设计创作，主要内容包括：本发明涉及航空发动机锪孔装备领域,尤其是一种提高均压孔锪孔倒圆后表面质量、杜绝锪孔倒圆后涡流探伤报警的航空发动机九级篦齿盘均压孔锪孔刀具及锪孔方法。本发明解决其技术问题所采用的技术方案是：航空发动机九级篦齿盘均压孔锪孔刀具,包括刀具本体,所述刀具本体的一端设置有切削刃,所述切削刃的前刃口处设置有前刃口斜角,所述切削刃的后刃口处设置有后刃口斜角。本发明通过对锪孔刀具的巧妙改进,有效的提高了均压孔锪孔倒圆后表面质量,也减轻了刀具挤压均压孔内壁、避免刃口划伤均压孔表面、杜绝锪孔倒圆后涡流探伤报警故障的目的。本发明尤其适用于航空发动机九级篦齿盘均压孔锪孔工艺之中。(The invention relates to the field of aircraft engine spot facing equipment, in particular to an aircraft engine nine-stage slotted comb tooth disc pressure-equalizing hole spot facing cutter and a spot facing method, which can improve the surface quality of a pressure-equalizing hole spot facing after rounding and prevent eddy current flaw detection alarm after rounding of the spot facing. The technical scheme adopted by the invention for solving the technical problems is as follows: nine grades of labyrinth dish voltage-sharing hole spot facing cutters of aeroengine, including the cutter body, the one end of cutter body is provided with the cutting edge, the preceding blade department of cutting edge is provided with preceding blade oblique angle, the back blade department of cutting edge is provided with the back blade oblique angle. According to the invention, through skillful improvement on the spot-facing cutter, the surface quality of the chamfered surface of the pressure-equalizing hole is effectively improved, and the purposes that the cutter extrudes the inner wall of the pressure-equalizing hole, the surface of the pressure-equalizing hole is prevented from being scratched by a cutting edge, and the eddy current flaw detection alarm fault after the chamfer is chamfered are avoided. The method is particularly suitable for the reaming process of the pressure-equalizing hole of the nine-stage slotted disk of the aircraft engine.)

1. Nine grades of comb fluted disc voltage-sharing hole spot facing cutters of aeroengine, its characterized in that: the cutting tool comprises a tool body (1), wherein a cutting edge (2) is arranged at one end of the tool body (1), a front cutting edge bevel (23) is arranged at a front cutting edge (22) of the cutting edge (2), and a rear cutting edge bevel (24) is arranged at a rear cutting edge (21) of the cutting edge (2).

2. The aircraft engine nine-stage grated disc pressure equalizing hole spot facing cutter as claimed in claim 1, characterized in that: the cutting edges (2) are uniformly arranged around the central axis of the cutter body (1).

3. The aircraft engine nine-stage grated disc pressure equalizing hole spot facing cutter as claimed in claim 2, characterized in that: the number of the cutting edges (2) is 4.

4. The aircraft engine nine-stage grated disc pressure equalizing hole spot-facing cutter as claimed in claim 1, 2 or 3, wherein: the end surface of one end of the cutter body (1) close to the cutting edge (2) is of a conical surface structure (11).

5. The aircraft engine nine-stage grated disc pressure equalizing hole spot-facing cutter as claimed in claim 1, 2 or 3, wherein: and the included angle between the front cutting edge oblique angle (23) and the rear cutting edge oblique angle (24) and the central axis of the cutter body 1 is 5 degrees.

6. The spot facing method by using the nine-stage grated disc pressure equalizing hole spot facing cutter of the aero-engine according to claim 1, characterized in that: when a hole of phi 5.0mm is reamed, the hole is reamed from phi 5.0mm to phi 5.1mm firstly, and then is reamed from phi 5.1mm to phi 5.2 mm.

Technical Field

The invention relates to the field of aircraft engine spot facing equipment, in particular to a nine-stage slotted disk pressure-equalizing hole spot facing cutter and a spot facing method for an aircraft engine.

Background

The nine-stage grate disc is a key part of an aircraft engine core machine, the working environment is severe, the stress condition is complex, the fault damage is serious, and particularly, the crack fault at the edge of a pressure equalizing hole is the most prominent. According to the requirement of repair technical documents, when the service life of the engine is longer than 1000 hours after the engine is repaired, in order to remove a stress concentration layer at the edge of the pressure equalizing hole and a material tissue defect layer formed after the engine works, the nine-stage labyrinth plate 32 pressure equalizing holes are subjected to hole expanding and hole edge chamfering (spot facing). However, the problems of high eddy current flaw detection signal value and even alarm after reaming and spot facing of the pressure equalizing hole exist for a long time, the product quality safety is greatly threatened, and the nine-stage slotted toothed disc can be scrapped occasionally.

Disclosure of Invention

The invention aims to solve the technical problem of providing an aircraft engine nine-stage slotted disk pressure-equalizing hole spot-facing cutter and a spot-facing method, wherein the cutter improves the surface quality of the spot-facing of the pressure-equalizing hole after rounding and avoids eddy current flaw detection alarm after rounding of the spot-facing.

The technical scheme adopted by the invention for solving the technical problems is as follows: nine grades of labyrinth dish voltage-sharing hole spot facing cutters of aeroengine, including the cutter body, the one end of cutter body is provided with the cutting edge, the preceding blade department of cutting edge is provided with preceding blade oblique angle, the back blade department of cutting edge is provided with the back blade oblique angle.

Further, the cutting edges are uniformly disposed about a central axis of the cutter body.

Further, the number of the cutting edges is 4.

Furthermore, the end surface of the cutter body close to one end of the cutting edge is of a conical surface structure.

Further, the included angle between the front cutting edge oblique angle and the rear cutting edge oblique angle and the central axis of the cutter body 1 is 5 degrees.

Further, according to the method for reaming the uniform-pressure hole of the nine-stage grated disk of the aircraft engine, when a hole with the diameter of 5.0mm is reamed, firstly reaming from the diameter of 5.0mm to the diameter of 5.1mm, and then reaming from the diameter of 5.1mm to the diameter of 5.2 mm.

The invention has the beneficial effects that: according to the invention, through skillful improvement on the spot-facing cutter, the surface quality of the chamfered surface of the pressure-equalizing hole is effectively improved, and the purposes that the cutter extrudes the inner wall of the pressure-equalizing hole, the surface of the pressure-equalizing hole is prevented from being scratched by a cutting edge, and the eddy current flaw detection alarm fault after the chamfer is chamfered are avoided. The method is particularly suitable for the reaming process of the pressure-equalizing hole of the nine-stage slotted disk of the aircraft engine.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a side view of fig. 1.

Labeled as: the cutting tool comprises a tool body 1, a conical surface structure 11, a cutting edge 2, a rear cutting edge 21, a front cutting edge 22, a front cutting edge bevel 23 and a rear cutting edge bevel 24.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

The nine-stage grated disc pressure-equalizing hole spot-facing cutter for the aircraft engine comprises a cutter body 1, wherein a cutting edge 2 is arranged at one end of the cutter body 1, a front cutting edge 22 of the cutting edge 2 is provided with a front cutting edge bevel 23, and a rear cutting edge 21 of the cutting edge 2 is provided with a rear cutting edge bevel 24. The front cutting edge bevel 23 and the rear cutting edge bevel 24 can effectively avoid accidental injury of the cylindrical surface and the end surface plane of the hole caused by excessive bottom cutting and individual difference of nine-stage grated toothed discs. It is generally preferred that the angles between the front edge bevel 23 and the rear edge bevel 24 and the central axis of the tool body 1 be 5 degrees.

In the past, the problems that fluorescence and eddy current flaw detection are not abnormal before repairing nine-stage grated toothed discs, the eddy current flaw detection signal value is high after reaming, countersinking and polishing of a pressure equalizing hole and repairing, but the fluorescence flaw detection is not abnormal exist, the product quality safety is greatly threatened, and the nine-stage grated toothed discs are occasionally scrapped. After the nine-stage grated disc type pressure-equalizing hole spot-facing cutter of the aero-engine is adopted for processing, the problem that the eddy current flaw detection signal value is high and the condition of being stopped or scrapped after repairing is well solved. Therefore, the cutter reduces the rejection rate of the nine-stage grate disc in the repair process, improves the quality of countersinking (rounding) of the high-voltage generating part of the nine-stage grate disc, and ensures that the repair quality is more stable and controllable.

In order to achieve better uniformity of cutting force, as shown in fig. 2, the cutting edges 2 are preferably uniformly arranged around the central axis of the tool body 1. It is generally preferable that the number of the cutting edges 2 is 4, thereby improving cutting stability and surface quality. In addition, the end surface of the tool body 1 near the end of the cutting edge 2 is a conical surface structure 11, so that the tool body 1 and the cutting edge 2 can be guided by a guiding function in actual use.

As a group of optimization of the spot facing rounding, that is, reduction of the cutting amount once to improve the cutting quality, when spot facing is performed on a hole of Φ 5.0mm, it is preferable to spot facing from Φ 5.0mm to Φ 5.1mm first and then from Φ 5.1mm to Φ 5.2mm, thereby further improving the cutting quality.

The invention effectively improves the surface quality after spot facing (rounding) of the pressure-equalizing hole, lightens the extrusion of the inner wall of the pressure-equalizing hole by the cutter, simultaneously avoids the aim of scratching the surface of the pressure-equalizing hole by the cutting edge and avoids the fault of eddy current flaw detection and alarm after spot facing (rounding), and has very obvious technical advantages and wide market popularization prospect.