A kind of anti-deformation tooling for big gear ring heat treatment

Abstract

The utility model relates to mechanical equipment manufacturing field, concretely relates to a kind of anti-deformation tool for big gear ring heat treatment.The technical scheme is as follows:an anti-deformation tool for big gear ring heat treatment, including support base, support rod, bracing bar head, fixed nut and locating nut, the outer edge of the support base is uniformly distributed with multiple platforms along circumference, the center of each platform is equipped with the screw hole leading to the center, one support rod is screwed in each screw hole, the other end of the support rod is screwed together with bracing bar head;Fixed nut is screwed on one end of the support rod for the position fixation between the support rod and the support base, locating nut is screwed on the other end of the support rod for the position fixation between the support rod and the bracing bar head.The utility model can ensure that big gear ring maintains original size accuracy and shape accuracy during heat treatment process, significantly reduces the scrap rate caused by deformation, meets high-precision production demand, improves production efficiency and product quality.

Description

Technical Field

[0001] This utility model relates to the field of mechanical equipment manufacturing, specifically to a deformation-resistant tooling for heat treatment of large gear rings. Background Technology

[0002] In the field of mechanical transmission, the gear ring is a core component of rotary table equipment, and its performance directly affects the operating accuracy and reliability of the equipment. Heat treatment is a crucial process for improving the hardness, wear resistance, and fatigue strength of the gear ring. However, during heating and cooling, the gear ring is highly susceptible to deformation due to thermal stress, structural transformation stress, and its own structural characteristics, such as end face warping, inner hole ellipticization, and tooth profile distortion. This deformation leads to decreased assembly accuracy, deterioration of meshing performance, and in severe cases, even scrapping the gear ring, significantly increasing production costs and extending the production cycle. Utility Model Content

[0003] This invention provides a deformation-resistant fixture for heat treatment of large gear rings, which can ensure that the large gear rings maintain their original dimensional and shape accuracy during heat treatment, significantly reduce the scrap rate caused by deformation, meet the requirements of high-precision production, and improve production efficiency and product quality.

[0004] The technical solution of this utility model is as follows:

[0005] A deformation-resistant fixture for heat treatment of large gear rings includes a support base, a support rod, a strut head, a fixing nut, and a positioning nut. Multiple platforms are evenly distributed circumferentially along the outer edge of the support base. Each platform has a threaded hole leading to its center, and a support rod is screwed into each threaded hole. The other end of the support rod is screwed to the strut head. The fixing nut is screwed onto one end of the support rod to fix its position between the support rod and the support base, and the positioning nut is screwed onto the other end of the support rod to fix its position between the support rod and the strut head.

[0006] Furthermore, the anti-deformation tooling for heat treatment of large gear rings has 3-8 support rods.

[0007] Furthermore, for the anti-deformation tooling used in the heat treatment of the large gear ring, the number of support rods is 3-5 when the diameter D of the large gear ring is less than 500mm; and the number of support rods is 6-8 when the diameter D of the large gear ring is greater than or equal to 500mm.

[0008] Furthermore, in the aforementioned anti-deformation fixture for heat treatment of the large gear ring, the end face of the strut head is an arc surface that matches the inner edge dimension of the large gear ring; the strut head is made of ceramic or graphite material, and its surface roughness Ra is not higher than 0.8μm.

[0009] The beneficial effects of this utility model are as follows:

[0010] 1. The support rod of this utility model can be radially precisely adjusted through the thread to control the length of its extension out of the support base, so that the support rod head is tightly fitted with the inner hole of the large gear ring to implement tension force.

[0011] 2. The strut head of this utility model is made of ceramic or graphite material, and its end face is an arc surface with a surface roughness Ra of no more than 0.8μm. This can reduce damage to the inner surface of the large gear ring and has good thermal conductivity, ensuring that the inner hole of the large gear ring is heated evenly.

[0012] 3. This utility model can effectively offset the thermal stress and microstructure transformation stress during the heat treatment of the large gear ring, and control the roundness error of the large gear ring within 0.02mm. Compared with traditional tooling, the deformation is reduced by more than 70%. It can meet the stringent requirements of aerospace, high-end equipment manufacturing and other fields for high-precision gear rings, and significantly reduce the scrap rate. Attached Figure Description

[0013] Figure 1 A schematic diagram of a deformation-resistant tooling used for heat treatment of large gear rings;

[0014] Figure 2 This is a diagram showing the usage status of the anti-deformation tooling used for heat treatment of large gear rings. Detailed Implementation

[0015] like Figure 1 As shown, a deformation-resistant fixture for heat treatment of a large gear ring includes a support base 1, support rods 2, strut heads 3, fixing nuts 5, and positioning nuts 4. Multiple platforms are evenly distributed circumferentially along the outer edge of the support base 1. Each platform has a threaded hole leading to its center, and a support rod 2 is screwed into each threaded hole. The other end of the support rod 2 is screwed to the strut head 3. The fixing nut 5 is screwed onto one end of the support rod 2 to fix the position between the support rod 2 and the support base 1. The positioning nut 4 is screwed onto the other end of the support rod 2 to fix the position between the support rod 2 and the strut head 3. There are six support rods 2. The end face of the strut head 3 is an arc surface, matching the inner edge dimension of the large gear ring 6. The strut head 3 is made of ceramic material with a surface roughness Ra not exceeding 0.8 μm.

[0016] The work process is as follows:

[0017] like Figure 2 As shown, the support base 1 is placed stably on the bearing platform inside the heat treatment furnace, ensuring that its levelness error is within ±0.05mm.

[0018] Six support rods 2 are evenly distributed around the circumference of the support base 1 to prevent uneven heat dissipation caused by large-area contact between the support rod head 3 and the large gear ring. The surface of the support rod 2 is carburized and quenched to a hardness of HRC58-62 to improve the strength and wear resistance of the support rod 2 and ensure that it will not deform or be damaged during the clamping process. The circumferential positions of the six support rods 2 on the support base 1 are evenly distributed, and the angular deviation between adjacent support rods 2 does not exceed ±1°.

[0019] The strut head 3 and the support rod 2 are connected by threads and secured with a positioning nut 4 to prevent loosening during heat treatment. The support rod 2 is slowly extended radially by adjusting the threads until the strut head 3 gently contacts the inner hole of the large gear ring 6. At this point, the extension length of each support rod 2 is measured, and the mutual deviation should be controlled within ±0.1mm to ensure uniform support in all parts of the inner hole of the large gear ring 6.

[0020] The difference in thermal expansion coefficients between the tooling material and the large gear ring 6 is ≤10%. The tooling and the large gear ring 6 are preheated simultaneously to avoid support stress caused by temperature differences. As the temperature rises, the large gear ring 6 and the tooling undergo thermal expansion. The tightness of the fixing nut 5 and the positioning nut 4 is checked every 30 minutes. The fixing nut 5 and the positioning nut 4 are tightened again using a torque wrench to maintain a constant clamping force on the large gear ring 6. At the same time, the support status of the support rod 2 is observed. If the pressure on the inner hole of the large gear ring 6 changes due to thermal expansion of the support rod 2, the extension length of the support rod 2 is adjusted to ensure stable support force in the inner hole and prevent deformation of the large gear ring 6 due to thermal expansion and contraction.

[0021] After the large gear ring 6 has cooled to room temperature, use a torque wrench to gradually loosen the fixing nut 5 and the positioning nut 4 on the support rod 2 in a diagonal and crisscrossing order, slowly reducing the pressure of the support rod head 3 on the large gear ring 6 until the fixing nut 5 and the positioning nut 4 are completely loosened, and then remove the tooling.

Claims

1. A deformation-resistant tooling for heat treatment of large gear rings, characterized in that, The system includes a support base, a support rod, a strut head, a fixing nut, and a positioning nut. Multiple platforms are evenly distributed circumferentially along the outer edge of the support base. Each platform has a screw hole at its center leading to the center, and a support rod is screwed into each screw hole. The other end of the support rod is screwed to the strut head. The fixing nut is screwed onto one end of the support rod to fix its position between the support rod and the support base, and the positioning nut is screwed onto the other end of the support rod to fix its position between the support rod and the strut head.

2. The anti-deformation tooling for heat treatment of large gear rings according to claim 1, characterized in that, The number of support rods is 3-8.

3. The anti-deformation tooling for heat treatment of large gear rings according to claim 2, characterized in that, When the diameter D of the large gear ring is less than 500 mm, the number of support rods is 3-5; when the diameter D of the large gear ring is greater than or equal to 500 mm, the number of support rods is 6-8.

4. The anti-deformation tooling for heat treatment of large gear rings according to claim 1, characterized in that, The end face of the strut head is an arc surface that matches the inner edge dimension of the large gear ring; the strut head is made of ceramic or graphite material, and its surface roughness Ra is not higher than 0.8μm.

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