A thermal insulation correction device and method for low-carbon alloy steel aviation thin web gear

Abstract

The invention discloses a thermal insulation correction device and method for a low-carbon alloy steel aviation thin-web gear, the method comprising: determining a reverse torque support surface and a runout support surface according to the thin-web gear structure, designing and manufacturing a correction device; the over-correction torque support surface is the end face of the shaft tube or the end face of the boss; and the runout support surface is the surface at the edge of the gear plate; establishing a thermal insulation correction model, calculating the reverse torque correction amount; implementing the thermal insulation correction process preparation for the web gear: determining and recording the expected actual correction amount, using the maximum value of the reverse torque correction amount that does not produce cracks in the experiment for the cold over-corrected thin-web gear; determining the thermal insulation temperature T, bringing it into the thermal insulation correction model, inversely solving to obtain the thermal insulation time, and formulating a thermal insulation correction plan; setting the thermal insulation temperature and thermal insulation time during furnace loading, placing the assembled correction device into the thermal insulation furnace, and after the thermal insulation is completed, spraying water or naturally cooling it to room temperature, and after disassembly, retesting and verifying, and completing the thermal insulation correction of the deformed part.

Description

Technical Field

[0001] The invention belongs to the field of process technology, relates to a correction device structure and a heat preservation straightening process, and in particular to a heat preservation correction device and method for a low-carbon alloy steel aviation thin web gear. Background Art

[0002] In order to meet the high life requirements, aviation low-carbon alloy steel thin-web gears have many carburized surfaces. The carburizing process cannot restrain the free deformation of the gears in the red-hot state, and the subsequent pressure quenching correction capacity is limited. After heat treatment, the gear webs often show umbrella-shaped deflection, and the free tooth end faces still have large runout. At the same time, in order to meet the lightweight requirements, the webs are thin, and the machining process is sensitive to the heat treatment delivery status, and the accuracy and pass rate are difficult to guarantee. Cold and hot process deformation of low-carbon alloy steel thin-web gears or thin-walled parts is common and difficult to accurately control, and no effective correction or remedial measures have been formed for a long time.

[0003] The deformation control accuracy and capability of the existing heat treatment process cannot fully meet the machining requirements of aviation thin web gears. Relying on multiple reworks to improve the web deformation, the rework control accuracy is still low, the pass rate and efficiency are low, the number of reworks is limited, and it has an adverse effect on the carburizing hardness of the tooth surface, often leading to serious production delivery delays, causing a huge waste of production resources and costs. Summary of the invention

[0004] The present invention provides a thermal insulation correction device and method for a low-carbon alloy steel aviation thin-web gear, so as to better meet the machining requirements of the aviation thin-web gear.

[0005] In order to achieve the above tasks, the present invention adopts the following technical solutions:

[0006] A heat preservation correction device for a low-carbon alloy steel aviation thin web gear, the web gear comprising a gear plate and a shaft tube vertically arranged at the center of one side of the gear plate, and a boss is arranged at the center of the other side of the gear plate; the device comprises: a gear web correction frame, an end face locking ring, a spacer, a torque application bolt and a fastening bolt, wherein:

[0007] The gear web correction frame includes a correction disk and a correction ring coaxially arranged on one side of the correction disk, the outer diameter of the correction ring is larger than the correction disk, and the correction ring and the correction disk are connected by multiple fixing plates; a threaded hole is opened at the axis of the correction disk, and fixing holes are distributed on the correction ring;

[0008] The outer diameter of the end face locking ring matches the correction ring, and a circle of supporting grooves is provided on the inner circumference of the end face locking ring for supporting the jumping supporting surface; fastening holes matching the fixing holes are distributed on the end face locking ring;

[0009] The cushion block is a cylindrical structure, and one end surface of the cushion block is provided with two layers of step grooves for supporting the overcorrection torque support surface, wherein the lower layer of step grooves is used to cooperate with the boss end surface of the gear plate, and the upper layer of step grooves is used to cooperate with the end surface of the shaft tube; the other end surface of the cushion block is provided with a slot for cooperating with the end surface of the torque application bolt;

[0010] The screw rod part of the torque applying bolt is assembled in the threaded hole of the correction plate, and the lower end part is pressed in the clamping groove of the cushion block.

[0011] Furthermore, the process of assembling the web gear using the above-mentioned correction device includes:

[0012] First, determine the installation direction of the web gear according to the runout surface of the web gear that needs to be corrected;

[0013] Secondly, place the end face locking ring under the web gear so that the jumping support surface on the web gear is stuck in the support groove on the end face locking ring, and then rotate and adjust the end face locking ring to align the fastening hole and the fixing hole on the correction ring, and then pass the fastening bolt through the fastening hole and the fixing hole to restrict the web gear inside the gear web correction frame.

[0014] Finally, insert the gasket through the side of the gear web correction frame so that the over-correction torque support surface of the web gear is stuck in the step groove on the gasket, and then rotate the torque application bolt so that the end of the torque application bolt is screwed into the groove of the gasket, and the assembly is completed.

[0015] Furthermore, the torque applying bolt is made of high temperature resistant stainless steel and is threadedly matched with the web correction frame. Torque is applied to the web gear assembled in the end face locking ring through the torque applying bolt and the gasket, and the reverse torque correction amount V required to generate the torque is calculated according to the thermal insulation correction model; wherein, the torque application is ensured by the reverse torque correction amount of the torque bolt, and the reverse torque correction amount is measured by the change in the height difference between the top of the torque bolt and the plane of the correction disk on the web correction frame.

[0016] Furthermore, the thermal insulation correction model is:

[0017] VB=K·t a ·V b ·T c

[0018] Among them, VB is the expected actual correction amount, T is the insulation temperature, t is the insulation time, and V is the reverse torque correction amount; K, a, b, and c are parameters used to characterize material properties, insulation working conditions, and cooling characteristics and environmental factors, which are obtained by jointly solving orthogonal test data.

[0019] Furthermore, K = (4.1619073571 ± 0.5) × 10 -9, a=0.6958439442±0.1, b=0.8866945592±0.1, c=3.067073477±0.5.

[0020] Furthermore, the correction device also includes a locking nut, which is assembled on the torque application bolt and is used to lock the position of the torque application bolt after the torque application bolt applies torque to the web gear.

[0021] A thermal insulation correction method for a low-carbon alloy steel aviation thin web gear, comprising:

[0022] According to the thin web gear structure, the reverse torque support surface and the runout support surface are determined, and a correction device is designed and manufactured; the over-correction torque support surface is the end surface of the shaft tube or the end surface of the boss; and the runout support surface is the surface at the edge of the gear plate;

[0023] Establish a thermal insulation correction model and calculate the reverse torque correction amount;

[0024] Implement the preparation for the thermal insulation correction process for web gears: determine and record the expected actual correction amount, and use the maximum value of the reverse torque correction amount that does not produce cracks in the experiment to cold-correct the thin web gear; determine the thermal insulation temperature T, bring it into the thermal insulation correction model, inversely solve to obtain the thermal insulation time, and formulate a thermal insulation correction plan;

[0025] Set the insulation temperature and time for the furnace, put the assembled correction device into the insulation furnace, and after the insulation is over, sprinkle water or let it stand naturally to cool to room temperature. After disassembly, retest and verify to complete the insulation correction of the deformed parts.

[0026] Furthermore, when calculating the reverse torque correction amount, under a given expected actual correction amount VB, the material stress relief temperature of the web gear is used as the insulation temperature T, and the insulation time t is taken as 3-5h; first, a insulation time is selected within the range, and after V is calculated, if the value of V is greater than the maximum value of the reverse torque correction amount V that does not produce cracks in the experiment, the insulation time t is reselected until the calculated V is less than the maximum value, and the V is the available value.

[0027] Furthermore, the reverse torque correction amount V for the experiment without generating cracks refers to the actual expected correction amount VB obtained by continuously applying torque in a cold state after the web gear is assembled in the correction device, observing and recording. When cracks begin to appear on the surface of the web gear, the application of torque is stopped, and the reverse torque correction amount applied at this time is recorded. By testing multiple web gears of the same batch, a series of reverse torque correction amount values ​​are obtained, and the maximum value is selected as the reverse torque correction amount for the experiment without generating cracks.

[0028] Furthermore, if the actual correction amount VB is expected to be within 0.3mm, the correction should be completed in one time; if it is greater than 0.3mm, due to the risk of cracks, the correction should be completed twice or more, and magnetic particle inspection should be added.

[0029] Furthermore, when multiple corrections are performed, in order to reduce the risk of cracks, the subsequent correction amount should not be greater than the previous one.

[0030] Compared with the prior art, the present invention has the following technical features:

[0031] The method of the present invention can efficiently and accurately correct the web runout and tooth end face runout, reduce the scrapping of batch products, relieve the production delivery pressure, and improve and stabilize the product qualification rate. For aviation low-carbon alloy steel thin web gears that produce runout, a single heat preservation correction can achieve 100% web runout correction within 0.3mm. The correction rate of the original deformed scrapped parts before grinding is as high as 80%, and the time consumed is 30% of the heat treatment rework time. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Implementing process for thermal insulation correction process;

[0033] Figure 2 (a), (b), (c) are the models of the thin web gear tooth blank corrected at different angles;

[0034] Figure 3 It is a side view of the corrected thin web gear;

[0035] Figure 4 (a) and (b) are the overall view and side sectional view of the web correction frame;

[0036] Figure 5 (a) and (b) are the overall view and side sectional view of the end face locking ring;

[0037] Figure 6 (a) and (b) are the overall view and side sectional view of the cushion block;

[0038] Figure 7 (a) and (b) are the overall view and side sectional view of the thermal insulation correction fixture assembly.

[0039] Explanation of the numbers in the figure: 1 web gear, 2 shaft tube, 3 boss, 4 over-correction torque support surface, 5 gear plate, 6 runout support surface, 7 gear web correction frame, 8 correction ring, 9 threaded hole, 10 fixing plate, 11 fixing hole, 12 correction plate, 13 end face locking ring, 14 support groove, 15 fastening hole, 16 spacer, 17 step groove, 18 torque application bolt, 19 locking nut, 20 fastening bolt. DETAILED DESCRIPTION

[0040] The present invention provides an effective correction method for machining deformation of aviation low-carbon alloy steel thin web gear 1. Based on the principle of stress superposition and elimination, reverse torque is applied to the thin web deflection deformation gear, and constraints are imposed on the free tooth end face with large runout, so that stress is redistributed, and stress is rebalanced through stress elimination and heat preservation. A correction model is established through experimental exploration. 100% correction of web deformation within 0.3mm can be achieved without affecting the hardness and other properties of the workpiece.

[0041] Referring to the accompanying drawings, the method of the present invention comprises the following steps:

[0042] Step 1, according to the structure of the thin web gear 1, determine the reverse torque support surface and the runout support surface 6, design and manufacture a correction device; use the designed correction device to assemble the web gear 1. The web gear 1 includes a gear plate 5 and a shaft tube 2 vertically arranged at the center of one side of the gear plate 5, and a boss 3 is arranged at the center of the other side of the gear plate 5.

[0043] According to the runout surface that needs to be corrected for the web gear 1 , the overcorrection torque support surface 4 is the end surface of the shaft tube 2 or the end surface of the boss 3 ; and the runout support surface 6 is the surface at the edge of the gear plate 5 .

[0044] The correction device comprises a gear web correction frame 7, an end face locking ring 13, a cushion block 16, a torque application bolt 18 and a fastening bolt 20, wherein:

[0045] The gear web correction frame 7 includes a correction disk 12 and a correction ring 8 coaxially arranged on one side of the correction disk 12. The outer diameter of the correction ring 8 is larger than the correction disk 12. The correction ring 8 and the correction disk 12 are connected by multiple fixing plates 10. A threaded hole 9 is opened at the axis of the correction disk 12, and fixing holes 11 are distributed on the correction ring 8.

[0046] The outer diameter of the end face locking ring 13 matches the correction ring 8 , and a circle of support grooves 14 is provided on the inner circumference of the end face locking ring 13 for supporting the jumping support surface 6 ; fastening holes 15 matching the fixing holes 11 are distributed on the end face locking ring 13 .

[0047] The pad 16 is a cylindrical structure, and one end face thereof is provided with two layers of step grooves 17 for supporting the over-correction torque support surface 4, wherein the lower layer of the step groove 17 is used to cooperate with the end face of the boss 3 of the gear plate 5, and the upper layer of the step groove 17 is used to cooperate with the end face of the shaft tube 2; the other end face of the pad 16 has a slot for cooperating with the end face of the torque application bolt 18.

[0048] The screw rod portion of the torque applying bolt 18 is assembled in the threaded hole 9 of the correction plate 12 , and the lower end portion is pressed against the groove of the cushion block 16 .

[0049] Optionally, the correction device further comprises a locking nut 19 , which is assembled on the torque applying bolt 18 and is used to lock the position of the torque applying bolt 18 after the torque applying bolt 18 applies torque to the web gear 1 .

[0050] The process of assembling the web gear 1 using the above-mentioned correction device is as follows:

[0051] First, determine the installation direction of the web gear 1 according to the runout surface of the web gear 1 that needs to be corrected; Figure 7 In the example, the gear plate 5 on the web gear 1 jumps toward the side where the boss 3 is located, so the side where the boss 3 is located is the jumping surface, and the web gear 1 is installed into the gear web correction frame 7 with the boss 3 facing upward.

[0052] Secondly, place the end face locking ring 13 under the web gear 1 so that the jumping support surface 6 on the web gear 1 is stuck in the support groove 14 on the end face locking ring 13, and then rotate and adjust the end face locking ring 13 to align the fastening hole 15 and the fixing hole 11 on the correction ring 8, and then pass the fastening bolt 20 through the fastening hole 15 and the fixing hole 11, so as to restrict the web gear 1 inside the gear web correction frame 7.

[0053] Finally, insert the gasket 16 through the side of the gear web correction frame 7 facing inward, so that the over-correction torque support surface 4 of the web gear 1 is stuck in the step groove 17 on the gasket 16, and then rotate the torque application bolt 18 so that the end of the torque application bolt 18 is screwed into the groove of the gasket 16, and the assembly is completed.

[0054] In the above scheme, the torque application bolt 18 is made of high temperature resistant stainless steel, and is threadedly matched with the web correction frame 7. The torque is applied to the web gear 1 assembled in the end face locking ring 13 through the torque application bolt 18 and the pad 16. The reverse torque correction amount V required to generate the torque is calculated according to the thermal insulation correction model to obtain an accurate correction amount. Among them, the torque application is guaranteed by the reverse torque correction amount of the torque bolt, and the reverse torque correction amount is measured by the height difference change between the top of the torque bolt and the plane of the correction disk 12 on the web correction frame 7. In this embodiment, the material of the correction device is 1Cr18Ni9Ti stainless steel.

[0055] Step 2: Establish a heat preservation correction model and calculate the reverse torque correction amount. The key variables involved in determining the expected actual correction amount VB (mm) are the heat preservation temperature T (℃), the heat preservation time t (h), and the reverse torque correction amount V (mm).

[0056] The thermal insulation correction model proposed by the present invention is as follows:

[0057] VB=K·t a ·V b ·T c

[0058] Among them, K, a, b, and c are parameters used to characterize environmental factors such as material properties, thermal insulation working conditions, and cooling characteristics, which are obtained by jointly solving orthogonal test data.

[0059] In this scheme, for the heat preservation straightening process of low-carbon alloy steel aviation thin web gear 1, the model parameter value range is K = (4.1619073571 ± 0.5) × 10 -9 , a=0.6958439442±0.1, b=0.8866945592±0.1, c=3.067073477±0.5.

[0060] Through the above insulation correction model, the reverse torque correction amount V can be calculated under the given expected actual correction amount VB. During the calculation, the material stress relief temperature of the web gear 1 is used as the insulation temperature T, and the insulation time t is 3-5h; first select a insulation time within this range, and after V is calculated, if the value of V is greater than the maximum value of the reverse torque correction amount V without cracks in the experiment, reselect the insulation time t until the calculated V is less than the maximum value, and the V is the usable value.

[0061] Step 3, implement the preparation of the web gear insulation correction process and formulate an insulation correction plan. Measure the mass-produced parts with severe runout and runout deformation, determine and record the expected actual correction amount VB, use the maximum value of the reverse torque correction amount V that does not produce cracks in the experiment to cold over-correct the thin web gear 1, and complete the assembly. Determine the material stress relief temperature of the web gear 1, which is usually used as the insulation temperature T, and substitute it into the above formula. The insulation time t is obtained by inverse solution as shown below, and an insulation correction plan is formulated.

[0062]

[0063] Among them, the reverse torque correction amount V for the experiment without generating cracks refers to the actual correction amount VB expected to be obtained after the web gear 1 is assembled in the correction device in a cold state (i.e., room temperature). By continuously applying torque, observing and recording, when cracks begin to appear on the surface of the web gear 1, the application of torque is stopped, and the reverse torque correction amount applied at this time is recorded; by testing multiple web gears 1 of the same batch, a series of reverse torque correction amount values ​​are obtained, and the maximum value is selected as the reverse torque correction amount V for the experiment without generating cracks and substituted into the above formula to calculate t.

[0064] Due to the over-correction deformation of the end face linkage web, the end face runout and web runout cannot be corrected at the same time. The fixture uses two web correction rings 8. The model is universal and the parameters are calculated from the runout correction experimental data.

[0065] Step 4, implement the insulation correction process. Set the insulation temperature T and insulation time t in the furnace, put the correction device assembled in step 1 (the bolt position can be locked with the locking nut 19) into the insulation furnace, and after the insulation is completed, sprinkle water or let it stand naturally to cool to room temperature. After disassembly, retest and verify, and the insulation correction of the deformed part is completed.

[0066] In principle, if the actual correction amount VB is expected to be within 0.3mm, it is recommended to complete the correction in one time. If it is greater than 0.3mm, due to the risk of cracks, it is recommended to complete the correction twice or more and add magnetic particle inspection. When multiple corrections are made, in order to reduce the risk of cracks, the subsequent correction amount should not be greater than the previous one.

[0067] In the specific test of the method of the present invention, the key constraint dimension of the thin web gear related to the gear plate runout is required to be 9.71±0.05mm before grinding. The key dimensions of gears 1, 2, 3, and 4 are out of tolerance before correction. After correction, gear 1, 2, and 4 are qualified, and gear 3 is over-corrected and scrapped.

[0068] Table 1 Some successful or significant correction cases in the experiment

[0069]

[0070]

[0071] Affected by the carburization of the tooth end face, the circular runout correction effect is significant only when the circular runout of the end face is large and not a single deviation. However, this type of out-of-tolerance situation is extremely rare. The tooth end circular runout correction function provided by this method is only an auxiliary function.

[0072] Example:

[0073] Step 1: According to the mass-produced thin-web gear structure, determine that the reverse torque support surface is the tooth end surface, the runout support surface is the opposite shoulder, and design and manufacture the correction device.

[0074] Step 2: Conduct an orthogonal experiment of thermal insulation correction and establish a thermal insulation correction model. Calculate the formula parameters based on the experimental data and the empirical model.

[0075] Table 2 Part of experimental data

[0076]

[0077] After calculation based on experimental data, the formula parameter values ​​are determined as follows:

[0078] K=4.1619073571×10-9, a=0.6958439442, b=0.8866945592, c=3.067073477.

[0079] Step 3, implement the preparation for the web gear insulation correction process.

[0080] The batch-produced parts with serious runout and runout deformation were measured. The experimental gear end face circular runout was 0.08mm, which met the requirement of end face runout less than 0.1mm. The key dimension was 9.34mm, which did not meet the required value of 9.71±0.05mm and exceeded the lower tolerance by 0.32mm. Correction was required. The best expected actual correction amount VBpr=0.37 reached 9.71mm. Considering the high crack risk caused by large correction amount, the expected actual correction amount VB=0.34mm was selected. The correction amount exceeded 0.3mm, and two thermal insulation straightening were planned, with VB1=0.2mm for the first time and VB2=0.14mm for the second time. The correction object is 9310 steel. According to the heat treatment process regulations, the stress relief temperature that does not affect the carburizing hardness should be 135±10℃. The insulation temperature is selected as 135℃. The actual insulation furnace temperature is 135±5℃. According to the experiment, in order to reduce the risk of cracks, the second correction amount should not be greater than the first. The overcorrection amount V is selected as V1=2.4mm, V2=2mm. The insulation time t1, t2 is calculated by the following formula. The correction plan is formulated as follows:

[0081]

[0082] Table 3 Insulation correction scheme

[0083]

[0084] Assemble the fixture and workpiece and prepare the holding furnace.

[0085] Step 4, implement the insulation correction process according to the correction plan formulated in step 3. Set the insulation temperature of the furnace to 150℃, the insulation time t1 = 14.5h, after the insulation is over, cool it to room temperature with water spray, and measure it with a three-coordinate measuring instrument. The actual correction amount VB1 = 0.217mm is obtained. Clamp it for the second insulation correction. Set the insulation temperature of the furnace to 150℃, the insulation time t2 = 11h, after the insulation is over, cool it to room temperature with water spray, and measure it with a three-coordinate measuring instrument. The actual correction amount VB2 = 0.143mm is obtained, and the cumulative correction amount VB = 0.36mm is obtained. There is no crack in the magnetic particle inspection.

[0086] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A thermal insulation correction device for low-carbon alloy steel aviation thin web gear, characterized in that: The web gear (1) comprises a gear plate (5) and a shaft tube (2) vertically arranged at the center of one side of the gear plate (5), and a boss (3) is arranged at the center of the other side of the gear plate (5); the device comprises: a gear web correction frame (7), an end face locking ring (13), a cushion block (16), a torque application bolt (18) and a fastening bolt (20), wherein: The gear web correction frame (7) comprises a correction disk (12) and a correction ring (8) coaxially arranged on one side of the correction disk (12); the outer diameter of the correction ring (8) is larger than that of the correction disk (12); the correction ring (8) and the correction disk (12) are connected via a plurality of fixing plates (10); a threaded hole (9) is provided at the axis of the correction disk (12); and fixing holes (11) are distributed on the correction ring (8); The outer diameter of the end face locking ring (13) matches the correction ring (8), and a circle of supporting grooves (14) is provided on the inner circumference of the end face locking ring (13) for supporting the jumping supporting surface (6) on the web gear (1); the end face locking ring (13) is provided with fastening holes (15) matching with the fixing holes (11); The cushion block (16) is a cylindrical structure, and one end surface of the cushion block is provided with two layers of step grooves (17) for supporting the overcorrection torque support surface (4), wherein the lower layer of the step groove (17) is used to cooperate with the end surface of the boss (3) of the gear plate (5), and the upper layer of the step groove (17) is used to cooperate with the end surface of the shaft tube (2); the other end surface of the cushion block (16) is provided with a slot for cooperating with the end surface of the torque application bolt (18); The screw portion of the torque applying bolt (18) is assembled in the threaded hole (9) of the correction plate (12), and the lower end portion is pressed against the groove of the cushion block (16); The torque applying bolt (18) is made of high temperature resistant stainless steel and is threadedly matched with the web correction frame (7). The torque applying bolt (18) and the spacer (16) are used to apply torque to the web gear (1) assembled in the end face locking ring (13) to generate the reverse torque correction amount required for the torque. V It is calculated according to the thermal insulation correction model; wherein the torque application is ensured by the reverse torque correction amount of the torque bolt, and the reverse torque correction amount is measured by the height difference change between the top of the torque bolt and the plane of the correction plate (12) on the web correction frame (7); The insulation correction model is: VB=K·t a ·V b ·T c ； in, VB To obtain the actual correction, T For the insulation temperature, t For the insulation time, V is the reverse torque correction amount; K are parameters that characterize material properties, a It is a parameter to characterize the characteristics of thermal insulation conditions. c Parameters of standard cooling characteristic environmental factors, K , a , b , c Obtained by jointly solving the orthogonal test data.

2. The heat preservation correction device for low carbon alloy steel aviation thin web gear according to claim 1 is characterized in that: The process of assembling the web gear (1) using the correction device comprises: Firstly, the installation direction of the web gear (1) is determined according to the runout surface of the web gear (1) that needs to be corrected; Secondly, place the end face locking ring (13) under the web gear (1) so that the jumping support surface (6) on the web gear (1) is stuck in the support groove (14) on the end face locking ring (13), and then rotate and adjust the end face locking ring (13) so that the fastening hole (15) and the fixing hole (11) on the correction ring (8) are aligned, and then pass the fastening bolt (20) through the fastening hole (15) and the fixing hole (11), so as to restrict the web gear (1) inside the gear web correction frame (7); Finally, a spacer (16) is inserted into the gear web correction frame (7) from the side so that the over-correction torque support surface (4) of the web gear (1) is stuck in the step groove (17) on the spacer (16), and then the torque application bolt (18) is rotated so that the end of the torque application bolt (18) is screwed into the groove of the spacer (16), and the assembly is completed.

3. The heat preservation correction device for low carbon alloy steel aviation thin web gear according to claim 1 is characterized in that: K =(4.1619073571±0.5)×10 -9 ， a =0.6958439442±0.1， b =0.8866945592±0.1， c =3.067073477±0.5。 4. The heat preservation correction device for low carbon alloy steel aviation thin web gear according to claim 1 is characterized in that: The correction device also includes a locking nut (19), which is assembled on the torque application bolt (18) and is used to lock the position of the torque application bolt (18) after the torque application bolt (18) applies torque to the web gear (1).

5. A method for heat preservation correction of low carbon alloy steel aviation thin web gear, characterized in that: A method for heat preservation correction of a low-carbon alloy steel aviation thin web gear is performed using the heat preservation correction device for the low-carbon alloy steel aviation thin web gear according to any one of claims 1 to 4, the method comprising: According to the structure of the thin web gear (1), the reverse torque support surface and the runout support surface (6) are determined, and a correction device is designed and manufactured; the overcorrection torque support surface (4) is the end surface of the shaft tube (2) or the end surface of the boss (3); and the runout support surface (6) is the surface at the edge of the gear plate (5); Establish a thermal insulation correction model and calculate the reverse torque correction amount; Preparation for thermal correction of web gears: Determine and record the expected actual correction amount, and use the maximum value of the reverse torque correction amount that does not produce cracks in the experiment to correct the thin web gear (1) in a cold state; determine the thermal correction temperature T , bring it into the insulation correction model, inversely solve it to get the insulation time, and formulate the insulation correction plan; Set the insulation temperature and time for the furnace, put the assembled correction device into the insulation furnace, and after the insulation is over, sprinkle water or let it stand naturally to cool to room temperature. After disassembly, retest and verify to complete the insulation correction of the deformed parts.

6. The heat preservation correction method for low carbon alloy steel aviation thin web gear according to claim 5 is characterized in that: The reverse torque correction amount is calculated based on the actual correction amount obtained given the expected VB The material stress relief temperature of the web gear (1) is used as the insulation temperature. T , insulation time t The value is 3-5h ; First select a holding time within the range and calculate V After V The value is greater than the reverse torque correction amount that does not produce cracks in the experiment V If the maximum value is reached, reselect the holding time t， Until the calculated V is less than the maximum value, the V is the available value.

7. The heat preservation correction method for low carbon alloy steel aviation thin web gear according to claim 5 is characterized in that: The reverse torque correction amount that does not produce cracks in the test V , refers to the actual correction amount expected to be obtained in the cold state after the web gear (1) is assembled in the correction device VB By continuously applying torque, observing and recording, when cracks begin to appear on the surface of the web gear (1), stop applying torque and record the reverse torque correction amount applied at this time; by testing multiple web gears (1) of the same batch, a series of reverse torque correction amount values ​​are obtained, and the maximum value is selected as the reverse torque correction amount that does not produce cracks in the experiment.

8. The heat preservation correction method for low carbon alloy steel aviation thin web gear according to claim 5 is characterized in that: If the actual correction amount VB is expected to be within 0.3mm, the correction should be completed in one time; if it is greater than 0.3mm, due to the risk of cracks, the correction should be completed twice or more, and magnetic particle inspection should be added.

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