Quenching clamp for reducing heat treatment deformation of output gear of aero-engine

Abstract

The utility model discloses a quenching fixture for reducing heat treatment deformation of an output gear of an aero-engine, which comprises a positioning mandrel, an outer compression ring mounted on a quenching disc, and an inner compression ring and an outer ring support ring which are mounted on an oil cylinder on a press, the outer pressing ring and the outer ring supporting ring are located at the upper end and the lower end of the outer edge of the output gear respectively to clamp the outer edge of the output gear, and the lower end of the inner pressing ring is located at the upper end of a center hole of the output gear to press the output gear on a quenching disc. According to the technical scheme, the problems that in the prior art, the output gear is positioned through a positioning mandrel, an outer pressing ring and an outer ring supporting ring are matched to extrude the area, prone to deformation, of the outer edge of the output gear, meanwhile, an inner pressing ring is used for positioning and pressurizing the center of the top of the output gear, and heat treatment deformation of the output gear is reduced are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat treatment fixtures, in particular to a quenching fixture used for reducing heat treatment deformation of an output gear of an aerospace engine. Background Art

[0002] As the instruction manual Figure 6 As shown in the figure, the part is the output gear of a certain model of engine. The part has a large diameter, thin wall and asymmetric structure. The final heat treatment requirement of the part is carbonitriding quenching and tempering. In the previous heat treatment process, the part was quenched in a free state on the pallet. Due to thermal stress, tissue stress and part structure, the part was severely deformed after quenching. The warping of the external tooth end face can reach 0.8mm, which seriously affects the subsequent machining process and the part scrap rate is high. Therefore, the quenching fixture is designed to fix the easily deformed parts of the part, reduce its deformation during heat treatment, and improve the product qualification rate. Utility Model Content

[0003] The purpose of the utility model is to provide a quenching fixture for reducing the heat treatment deformation of the output gear of an aircraft engine. The output gear is positioned by a positioning core shaft, and the easily deformed area of ​​the outer edge of the output gear is squeezed by the cooperation of the outer pressure ring and the outer ring support ring. At the same time, the center of the top of the output gear is positioned and pressurized by the inner pressure ring, thereby reducing its heat treatment deformation, stabilizing the runout of the outer tooth end face of the output gear within 0.2mm, and greatly improving the qualified rate.

[0004] The utility model provides the following technical solution: a quenching fixture for reducing heat treatment deformation of an output gear of an aircraft engine, comprising a positioning core shaft and an outer pressure ring installed on a quenching plate, and an inner pressure ring and an outer ring support ring installed on an oil cylinder on a press machine, wherein the positioning core shaft is inserted into the center hole of the output gear, the outer pressure ring and the outer ring support ring are respectively located at the upper end and the lower end of the outer edge of the output gear to clamp the outer edge of the output gear, and the lower end of the inner pressure ring is located at the upper end of the center hole of the output gear to press the output gear onto the quenching plate.

[0005] In order to fix the positioning mandrel, the positioning mandrel includes a mandrel portion, a clamping step is formed on the lower end of the mandrel portion, and the clamping step is clamped on the fixture of the quenching press.

[0006] In order to position the output gear, positioning teeth are formed on the surface of the core shaft portion, and the positioning teeth are matched with the inner wall of the center hole of the output gear.

[0007] In order to improve the heat dissipation efficiency, the outer ring support ring includes a support ring body, and evenly distributed heat dissipation holes are opened on the surface of the support ring body.

[0008] In order to fix the outer pressure ring, the outer pressure ring includes an outer pressure ring body, one end of which is formed with an outer pressure ring flange, and the outer pressure ring flange is connected to the upper oil cylinder of the press through fasteners.

[0009] In order to improve the heat dissipation efficiency, heat dissipation holes are also opened on the surface of the outer pressure ring body.

[0010] In order to position and shape the center of the output gear, the inner pressure ring includes a frustum, and the upper and lower ends of the frustum are respectively formed with a connecting ring and a lower end pressure ring. The connecting ring is connected to the upper oil cylinder of the press, and the lower end pressure ring is pressed on the upper end of the output gear.

[0011] In order to improve the heat dissipation efficiency and make the heat dissipation uniform, a through hole is opened in the center of the lower end pressure ring, and heat dissipation holes are also opened on the surface of the frustum.

[0012] Compared with the existing technology, the beneficial effects achieved by the utility model are: the output gear is positioned by the positioning core shaft, the easily deformed area on the outer edge of the output gear is squeezed by the cooperation of the outer pressure ring and the outer ring support ring, and the inner pressure ring is used to position and pressurize the center of the top of the output gear, thereby reducing its deformation during heat treatment, and stabilizing the runout of the outer tooth end face of the output gear within 0.2mm, thereby greatly improving the qualified rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0014] Figure 1 This is a schematic diagram of the parts clamping structure of the utility model;

[0015] Figure 2 It is a cross-sectional view of the positioning mandrel of the utility model;

[0016] Figure 3 This is a cross-sectional view of the outer ring support ring of the utility model;

[0017] Figure 4 It is a cross-sectional view of the inner pressure ring of the utility model;

[0018] Figure 5 It is a cross-sectional view of the external pressure ring of the utility model;

[0019] Figure 6 It is the structural diagram of the existing gear parts;

[0020] In the figure: 1. Positioning core shaft; 11. Clamping step; 12. Positioning tooth; 13. Core shaft part; 2. Outer ring support ring; 21. Support ring body; 22. Heat dissipation hole; 3. Inner pressure ring; 31. Connecting ring; 32. Heat dissipation hole; 33. Lower end pressure ring; 34. Through hole; 35. Cone; 4. Outer pressure ring; 41. Outer pressure ring body; 42. Heat dissipation hole; 43. Outer pressure ring flange; 5. Output gear. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0022] See also Figure 1 The utility model provides a technical solution: a quenching fixture for reducing the heat treatment deformation of the output gear of an aircraft engine, comprising a positioning core shaft 1 and an outer pressure ring 4 installed on the quenching plate, and an inner pressure ring 3 and an outer ring support ring 2 installed on the oil cylinder of the press. The positioning core shaft 1 is inserted into the center hole of the output gear 5 to position the output gear 5. The outer pressure ring 4 and the outer ring support ring 2 are respectively located at the upper and lower ends of the outer edge of the output gear 5. The outer pressure ring 4 and the outer ring support ring 2 have the same diameter, which clamps the outer edge of the output gear 5 and increases the Regarding the pressure on the output gear 5, the lower end of the inner pressure ring 3 is located at the upper end of the center hole of the output gear 5, pressing the output gear 5 against the quenching plate, and applying pressure to the outer edge of the output gear 5 through the cooperation of the outer pressure ring 4 and the outer ring support ring 2. At the same time, the inner pressure ring 3 is used to apply pressure to the center of the output gear 5, so that the thermal stress and pressure generated by the output gear 5 during heat treatment offset each other, reducing the deformation of the output gear 5, and stabilizing the outer tooth end face runout of the output gear 5 within 0.2 mm, which greatly improves the qualified rate and reduces the scrap loss.

[0023] like Figure 2 As shown, the positioning core shaft 1 includes a core shaft portion 13, and a clamping step 11 is formed at the lower end of the core shaft portion 13. The diameter of the clamping step 11 is smaller than the diameter of the core shaft portion 13. The clamping step 11 is clamped on the fixture of the quenching press to position and install the positioning core shaft 1.

[0024] Positioning teeth 12 are formed on the surface of the core shaft portion 13 , and the positioning teeth 12 cooperate with the inner wall of the center hole of the output gear 5 . The positioning teeth 12 fix the position of the output gear 5 so that the output gear 5 and the inner pressure ring 3 are on the same center line.

[0025] like Figure 3As shown, the outer ring support ring 2 includes a support ring body 21, and evenly distributed heat dissipation holes 22 are opened on the surface of the support ring body 21. The heat dissipation holes 22 increase the heat dissipation efficiency, make the heat dissipation uniform, and reduce the thermal stress caused by uneven heating.

[0026] like Figure 4 As shown, the outer pressure ring 4 includes an outer pressure ring body 41, and an outer pressure ring flange 43 is formed on one end of the outer pressure ring body 41. The outer pressure ring flange 43 is connected to the upper oil cylinder of the press through fasteners, completely fixing the outer pressure ring body 41 on the upper oil cylinder.

[0027] Heat dissipation holes 42 are also provided on the surface of the outer pressure ring body 41 , which increase the heat dissipation efficiency of the outer pressure ring 4 and make the heat dissipation uniform, thereby avoiding uneven heating and generating additional thermal stress.

[0028] like Figure 5 As shown, the inner pressure ring 3 includes a cone 35, and the upper and lower ends of the cone 35 are respectively formed with a connecting ring 31 and a lower pressure ring 33. The connecting ring 31 is connected to the upper oil cylinder of the press, and the lower pressure ring 33 is pressed on the upper end of the output gear 5. The output gear 5 is pressurized by the lower pressure ring 33 to position and shape the output gear 5. The cone 35 increases the contact area between the inner pressure ring 3 and the outside world, thereby improving the heat dissipation efficiency.

[0029] A through hole 34 is provided at the center of the lower end pressure ring 33, and heat dissipation holes 32 are also provided on the surface of the frustum 35. The through hole 34 and the heat dissipation holes 32 increase the air circulation efficiency, improve the heat dissipation efficiency, and make the heat dissipation uniform.

[0030] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A quenching fixture for reducing heat treatment deformation of aircraft engine output gears, characterized in that: It includes a positioning mandrel and an outer pressure ring installed on the quenching plate, and an inner pressure ring and an outer ring support ring installed on the oil cylinder of the press machine. The positioning mandrel is inserted into the center hole of the output gear, and the outer pressure ring and the outer ring support ring are respectively located at the upper end and the lower end of the outer edge of the output gear to clamp the outer edge of the output gear. The lower end of the inner pressure ring is located at the upper end of the center hole of the output gear to press the output gear onto the quenching plate.

2. A quenching fixture for reducing heat treatment deformation of aircraft engine output gears according to claim 1, characterized in that: The positioning mandrel comprises a mandrel portion, a clamping step is formed on the lower end of the mandrel portion, and the clamping step is clamped on a fixture of a quenching press.

3. A quenching fixture for reducing heat treatment deformation of aircraft engine output gears according to claim 2, characterized in that: Positioning teeth are formed on the surface of the core shaft portion, and the positioning teeth are matched with the inner wall of the center hole of the output gear.

4. A quenching fixture for reducing heat treatment deformation of aircraft engine output gears according to claim 1, characterized in that: The outer ring support ring comprises a support ring body, and evenly distributed heat dissipation holes are opened on the surface of the support ring body.

5. The quenching fixture for reducing heat treatment deformation of aircraft engine output gear according to claim 1, characterized in that: The outer pressure ring comprises an outer pressure ring body, one end of which is formed with an outer pressure ring flange, and the outer pressure ring flange is connected to the upper oil cylinder of the press machine through a fastener.

6. A quenching fixture for reducing heat treatment deformation of aircraft engine output gears according to claim 5, characterized in that: Heat dissipation holes are also provided on the surface of the outer pressure ring body.

7. A quenching fixture for reducing heat treatment deformation of aircraft engine output gears according to claim 1, characterized in that: The inner pressure ring comprises a frustum, the upper and lower ends of which are respectively formed with a connecting ring and a lower pressure ring, the connecting ring is connected to the upper oil cylinder of the press, and the lower pressure ring is pressed on the upper end of the output gear.

8. A quenching fixture for reducing heat treatment deformation of aircraft engine output gears according to claim 7, characterized in that: A through hole is provided at the center of the lower end pressure ring, and heat dissipation holes are also provided on the surface of the frustum.

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