Heat treatment anti-deformation method for thin-wall conical cylinder part

Abstract

The invention discloses a heat treatment anti-deformation method for thin-wall conical cylinder type parts, which is characterized in that the thin-wall conical cylinder type parts are divided into two types according to different diameter sizes of axial small ends of the thin-wall conical cylinder type parts, one type of the thin-wall conical cylinder type parts is coaxially stacked layer by layer from bottom to top with large ends upward, and the other type of the thin-wall conical cylinder type parts is coaxially stacked layer by layer from bottom to top with small ends upward. In the two stacking modes, two adjacent layers of thin-wall conical cylinder parts are connected in a hanging mode through double-end hooks. The device is convenient to operate and good in supporting performance, the number of heat treatment parts in the same furnace can be increased, the parts can be prevented from deforming, and the quality is guaranteed while the efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of aeroengine manufacturing, and relates to a heat treatment anti-deformation auxiliary device and method for thin-walled cone-type parts of an aeroengine. Background Art

[0002] In the production process of the internal structure of aircraft engines, cone-shaped thin-walled parts are one of the important parts to ensure their operating quality. Their diameters vary, such as Figure 1 As shown, when processing parts, they need to be stress-relieved by heat treatment. Due to the thin wall and poor rigidity of the parts themselves, deformation problems are prone to occur during the processing, and the processing quality cannot be guaranteed. On the other hand, due to the limitations of their shape structure and wall thickness, the effective space utilization rate of the processing furnace during heat treatment is low. For this reason, it is necessary to design reasonable heat treatment anti-deformation auxiliary devices and methods according to the production needs and design characteristics of the parts. Through the scientific and reasonable use of auxiliary devices, the rigidity of the parts during the processing process can be further strengthened, the deformation of the parts can be prevented, and the quality of the parts can be improved. At the same time, the effective space utilization rate of the furnace during the heat treatment of the parts can be improved through the designed heat treatment anti-deformation auxiliary devices and furnace loading methods, thereby improving the efficiency of part processing. Summary of the invention

[0003] The present invention aims to provide a method for preventing deformation of thin-walled conical cylinder parts during heat treatment, so as to solve the problems of deformation of thin-walled conical cylinder parts during heat treatment processing in aircraft engines and low effective utilization rate of their furnaces, and meet the requirements of simple operation and convenient clamping. It can effectively prevent deformation of thin-walled conical cylinder parts during heat treatment and significantly improve the processing efficiency of thin-walled conical cylinder parts.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A method for heat treatment and anti-deformation of thin-walled conical cylinder parts, comprising:

[0006] According to the diameter size of the axial small end of thin-walled conical parts, they are divided into the following two heat treatment furnace loading methods:

[0007] When the diameter size of the axial small end of the thin-walled cone-like parts is within the first size range, multiple thin-walled cone-like parts of the same specification are coaxially stacked from bottom to top, layer by layer, and the axial large ends of the thin-walled cone-like parts are uniformly facing upward to form a whole, and between two adjacent thin-walled cone-like parts, the axial small end of the thin-walled cone-like part located on the upper side is hung on the axial large end of the thin-walled cone-like part located on the lower side through a double-headed hook, and then put into the furnace;

[0008] When the diameter of the axial small end of the thin-walled cone-like parts is between the second size range, multiple thin-walled cone-like parts of the same specification are coaxially stacked from bottom to top, layer by layer, with the axial small ends of the thin-walled cone-like parts all facing upward to form a whole, and between two adjacent thin-walled cone-like parts, the axial large end of the thin-walled cone-like part located above is hung on the axial small end of the thin-walled cone-like part located below by a double-headed hook, and then put into the furnace.

[0009] As an option, a plurality of thin-walled conical tube parts of the same specification are coaxially stacked layer by layer to form a whole whose height is less than or equal to the effective furnace height of the heat treatment furnace.

[0010] As an option, the double-headed hook includes a straight hook body, and both ends of the hook body are bent once to form a first hook head and a second hook head with opposite opening directions but completely identical sizes.

[0011] As an option, when the diameter size of the axial small end of the thin-walled conical cylinder part is within the first size range, the double-headed hook is hung at equal intervals along the circumferential direction of the axial large end of the thin-walled conical cylinder part located below among two adjacent thin-walled conical cylinder parts, and one hook head is located on the inner side of the thin-walled conical cylinder part;

[0012] When the diameter size of the axial small end of the thin-walled conical tube part is between the second size range, the double-headed hook is hung at equal intervals along the circumferential direction of the axial small end of the thin-walled conical tube part located below between two adjacent thin-walled conical tube parts, and one hook head is located on the outside of the thin-walled conical tube part.

[0013] As an option, the number of double-headed hooks used when the diameter size of the axial small end of the thin-walled conical tube part is between the first size range is greater than the number of double-headed hooks used when the diameter size of the axial small end of the thin-walled conical tube part is between the second size range.

[0014] As an option, the material of the double-head hook satisfies that its melting point is much higher than the highest temperature of heat treatment of thin-walled conical cylinder parts.

[0015] As an option, the method for preventing deformation of thin-walled cone-like parts during heat treatment also includes the step of removing the thin-walled cone-like parts from the furnace after the heat treatment is completed. The thin-walled cone-like parts that have completed the heat treatment are disassembled from top to bottom and layer by layer, wherein each time a layer of thin-walled cone-like parts is disassembled, all the double-headed hooks corresponding to the layer are disassembled accordingly.

[0016] As an option, the numerical value of the first size range is Ф400mm~Ф1000mm, and the numerical value of the second size range is Ф100mm~Ф400mm.

[0017] Compared with the prior art, the heat treatment furnace loading method of the present invention is easy to operate and can be quickly clamped, saving both time and effort, while ensuring the processing quality of the heat treatment of the parts. The present invention has the following advantages:

[0018] (1) A double-headed hook is used as an auxiliary device for heat treatment to prevent deformation. The number of auxiliary devices used is flexible and adjustable, and clamping is convenient;

[0019] (2) The double-headed hook can effectively support the parts and prevent them from deformation. The straight hook body of the double-headed hook is relatively long, extending from the axial small end of one of the two adjacent thin-walled conical cylinder parts to the axial large end of the other. The direction of the force exerted by the double-headed hook on the thin-walled conical cylinder parts is mainly along the generatrix direction of the conical cylinder surface, which is the direction in which the compressive strength of the conical cylinder is the largest. In addition, since multiple double-headed hooks are evenly distributed at equal central angles on the same circumference, the force is evenly dispersed, avoiding the influence on the roundness of the thin-walled conical cylinder parts.

[0020] (3) Through double-headed hooks and two different stacking methods (the stacking methods are divided into two methods according to the different diameters of the small axial ends of thin-walled conical cylinder parts. The reason is that when the diameter of the small axial end of the thin-walled conical cylinder parts is small, its self-weight is light, and a small number of double-headed hooks can meet the anti-deformation requirements. When the diameter of the small axial end of the thin-walled conical cylinder parts is large, the self-weight increases accordingly. At this time, more double-headed hooks are required. Therefore, the method of facing the large end upward is adopted to obtain more double-headed hook hanging point positions, thereby evenly distributing more double-headed hooks), thin-walled conical cylinder parts can be stacked, which can improve the effective space utilization rate of the furnace during part processing and improve the part processing efficiency;

[0021] (4) The material of the double-head hook is 1Cr18Ni9Ti, which has a melting point of 1398°C, which meets the stress relief heat treatment temperature parameters of 500°C to 800°C for thin-walled conical parts, and has a high safety factor during the heat treatment process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 These are two different diameter thin-walled cone-type parts drawings involved in the present invention;

[0023] Figure 2 It is a part diagram of a double-head hook for heat treatment involved in the present invention;

[0024] Figure 3 The present invention is directed to Figure 1 The left side of the middle shows the clamping diagram of thin-walled conical parts entering the furnace;

[0025] Figure 4 The present invention is directed to Figure 1 The right side of the middle is the clamping diagram of thin-walled conical parts entering the furnace;

[0026] In the figure, 1-thin-walled cone-like parts; 2-double-headed hook. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to the common technical knowledge and customary means in the field are included in the scope of the present invention.

[0028] In this embodiment, an auxiliary device is designed according to the appearance characteristics of the thin-walled cone-shaped parts 1, such as Figure 2 The auxiliary device is a double-head hook 2. When the auxiliary device is used for heat treatment, it can ensure that the thin-walled cone-shaped parts 1 are heated evenly and that there is no bump during the processing of the thin-walled cone-shaped parts 1.

[0029] In this embodiment, different furnace loading methods are adopted according to the axial end diameter size classification of the thin-walled conical cylinder parts 1:

[0030] To prevent deformation of thin-walled cone-like parts 1 during processing, when the diameter of the small end of the thin-walled cone-like parts 1 is Ф400mm~Ф1000mm, use one double-headed hook 2 every 60°, and use a total of 6 double-headed hooks 2 for support processing. During assembly, the axial large end of the thin-walled cone-like parts 1 faces upward. After each thin-walled cone-like part 1 is assembled with 6 double-headed hooks 2, the second thin-walled cone-like part 1 is stacked on the double-headed hook 2 with the axial large end facing upward. After ensuring that the thin-walled cone-like parts 1 are securely placed, continue to assemble the double-headed hooks 2 corresponding to the second layer of thin-walled cone-like parts 1, and so on. The specific method is as follows Figure 3 shown.

[0031] In order to prevent the deformation of the thin-walled cone-like parts 1 during processing, when the diameter of the small end of the thin-walled cone-like parts 1 is Ф100mm~Ф400mm, one double-headed hook 2 is used every 120°, and a total of three double-headed hooks 2 are used to assemble on the outer wall of the thin-walled cone-like parts 1 to support the parts for processing. During assembly, the axial small end of the thin-walled cone-like parts 1 faces upward. After each thin-walled cone-like part 1 is assembled with three double-headed hooks 2, the second thin-walled cone-like part 1 is stacked on the double-headed hook 2 with the small end facing upward. After ensuring that the thin-walled cone-like parts 1 are securely placed, continue to assemble the double-headed hooks 2 corresponding to the second layer of thin-walled cone-like parts 1, and so on. The specific method is as follows Figure 4 shown.

[0032] In order to prevent the surface of the thin-walled cone-like parts 1 from being scratched during the disassembly process after processing, the present embodiment stipulates a disassembly method for the thin-walled cone-like parts 1 and the double-headed hooks 2 after processing. First, the first layer of thin-walled cone-like parts 1 is disassembled, and then the double-headed hooks 2 corresponding to this layer are disassembled, and then the second layer of thin-walled cone-like parts 1 is disassembled, and then the second layer of double-headed hooks 2 are disassembled until the disassembly is completed.

[0033] This embodiment provides a heat treatment anti-deformation auxiliary device for thin-walled cone-type parts of aircraft engines and a method for loading and unloading. The auxiliary device of the present invention is simple to operate and easy to use, and can effectively prevent the heat treatment anti-deformation of thin-walled cone-type parts 1, significantly improving the processing efficiency of thin-walled cone-type parts.

[0034] The following is the specific process of stress relief heat treatment of thin-walled cone parts 1:

[0035] (1) Inspection:

[0036] Check that the thin-walled cone parts 1 and the double-headed hooks 2 have no defects such as mechanical damage, rust, and dirt.

[0037] (2) Cleaning and degreasing:

[0038] Use a clean cloth dipped in acetone or FDS166 cleaning agent to carefully scrub the thin-walled cone-shaped parts 1 and the double-headed hooks 2. Wear clean gloves during the operation. Do not touch the thin-walled cone-shaped parts 1 and the double-headed hooks 2 with bare hands. Make sure that the thin-walled cone-shaped parts 1 and the double-headed hooks 2 are dry before loading into the furnace.

[0039] (3) Loading the furnace;

[0040] For the case where the axial small end diameter of the thin-walled cone-like parts 1 is Ф400mm, use one double-headed hook 2 every 60°, and use 6 double-headed hooks 2 for support processing. During assembly, the axial large end of the thin-walled cone-like parts 1 faces upward. After each thin-walled cone-like part 1 is assembled with 6 double-headed hooks 2, the second thin-walled cone-like part 1 is stacked on the double-headed hook 2 with the axial large end facing upward. After ensuring that the thin-walled cone-like parts 1 are placed securely, continue to assemble the double-headed hooks 2 corresponding to the second layer of thin-walled cone-like parts 1 to ensure that the thin-walled cone-like parts 1 are placed stably. The furnace door can be closed only after confirming that the thin-walled cone-like parts 1 are placed properly and there is no dirt on the thin-walled cone-like parts 1, double-headed hooks 2, and the furnace surface. If there is dirt, it needs to be carefully wiped with a clean cloth dipped in acetone.

[0041] (4) Heat treatment:

[0042] The prepared thin-walled cone-like parts 1 and the double-headed hook 2 are put into the furnace as a whole, and after closing the furnace door, the parts are subjected to stress relief treatment according to the requirements of the heat treatment process.

[0043] (5) Disassembly;

[0044] Disassemble the first layer (i.e. the top layer, disassemble from top to bottom) of the thin-walled cone-shaped parts 1, then disassemble the corresponding double-headed hooks 2, disassemble the second layer of thin-walled cone-shaped parts 1, and then disassemble the corresponding double-headed hooks 2 of the second layer until the disassembly is completed. Clean the double-headed hooks 2 for the next use. Wear clean gloves during the operation, and do not touch the surface of the thin-walled cone-shaped parts 1 with bare hands to prevent the thin-walled cone-shaped parts 1 from being contaminated.

[0045] The contents not described in detail in the specification of the present invention belong to the prior art known to the professional and technical personnel in the field. Although the illustrative specific embodiments of the present invention are described above to facilitate the understanding of the present invention by the technical personnel in the field, it should be clear that the present invention is not limited to the scope of the specific embodiments. For ordinary technicians in the field of this technology, as long as various changes are within the spirit and scope of the present invention defined and determined by the attached claims, these changes are obvious, and all inventions and creations using the concept of the present invention are protected.

Claims

1. A method for heat treatment and anti-deformation of thin-walled conical cylinder parts, characterized in that: include: According to the diameter size of the axial small end of thin-walled conical parts, they are divided into the following two heat treatment furnace loading methods: When the diameter size of the axial small end of the thin-walled cone-like parts is within the first size range, multiple thin-walled cone-like parts of the same specification are coaxially stacked from bottom to top, layer by layer, and the axial large ends of the thin-walled cone-like parts are uniformly facing upward to form a whole, and between two adjacent thin-walled cone-like parts, the axial small end of the thin-walled cone-like part located on the upper side is hung on the axial large end of the thin-walled cone-like part located on the lower side through a double-headed hook, and then put into the furnace; When the diameter of the axial small end of the thin-walled cone-like parts is between the second size range, multiple thin-walled cone-like parts of the same specification are coaxially stacked from bottom to top, layer by layer, with the axial small ends of the thin-walled cone-like parts all facing upward to form a whole, and between two adjacent thin-walled cone-like parts, the axial large end of the thin-walled cone-like part located above is hung on the axial small end of the thin-walled cone-like part located below by a double-headed hook, and then put into the furnace.

2. A method for preventing deformation by heat treatment of thin-walled conical cylinder parts according to claim 1, characterized in that: The overall height formed by coaxially stacking a plurality of thin-walled conical tube parts of the same specification layer by layer is less than or equal to the effective furnace height of the heat treatment furnace.

3. A method for preventing deformation by heat treatment of thin-walled conical cylinder parts according to claim 1, characterized in that: The double-headed hook comprises a straight hook body, and both ends of the hook body are bent once respectively to form a first hook head and a second hook head with opposite opening directions but completely the same size.

4. A method for preventing deformation by heat treatment of thin-walled conical tube parts according to claim 1, characterized in that: When the diameter size of the axial small end of the thin-walled cone-like part is within the first size range, the double-headed hook is hung at equal intervals along the circumferential direction of the axial large end of the thin-walled cone-like part located below among two adjacent thin-walled cone-like parts, and one hook head is located on the inner side of the thin-walled cone-like part; When the diameter size of the axial small end of the thin-walled conical tube part is between the second size range, the double-headed hook is hung at equal intervals along the circumferential direction of the axial small end of the thin-walled conical tube part located below between two adjacent thin-walled conical tube parts, and one hook head is located on the outside of the thin-walled conical tube part.

5. A method for preventing deformation by heat treatment of thin-walled conical tube parts according to claim 4, characterized in that: The number of double-headed hooks used when the diameter size of the axial small end of the thin-walled conical tube part is within the first size range is greater than the number of double-headed hooks used when the diameter size of the axial small end of the thin-walled conical tube part is within the second size range.

6. A method for preventing deformation by heat treatment of thin-walled conical tube parts according to claim 1, characterized in that: The material of the double-head hook is such that its melting point is much higher than the highest temperature of heat treatment of thin-walled conical tube parts.

7. The method for preventing deformation of thin-walled conical tube parts by heat treatment according to claim 1, characterized in that: It also includes the step of removing the thin-walled cone-like parts from the furnace after the heat treatment is completed. The thin-walled cone-like parts that have completed the heat treatment are disassembled from top to bottom and layer by layer. Among them, each time a layer of thin-walled cone-like parts is disassembled, all the double-headed hooks corresponding to the layer are disassembled accordingly.

8. The method for preventing deformation of thin-walled conical tube parts by heat treatment according to claim 1, characterized in that: The numerical value of the first size range is Ф400mm~Ф1000mm, and the numerical value of the second size range is Ф100mm~Ф400mm.

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