High-temperature alloy piston ring opening shaping method

Abstract

The invention belongs to the technical field of metal material heat treatment, and particularly relates to a high-temperature alloy piston ring opening shaping method which comprises the following steps that S101, a circular piston ring is machined and formed; s102, an opening is cut in the piston ring; s103, the piston ring with the cut opening is clamped, heat treatment is carried out in the clamping state, and the piston ring is finally shaped; heat treatment forming is carried out on the piston ring in the clamping state, the opening size of a warm alloy piston ring part can be guaranteed, meanwhile, the manufacturing efficiency and the qualification rate of the high-temperature piston ring can be improved, and the machining cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of heat treatment of metal materials, and in particular relates to a method for shaping the opening of a high-temperature alloy expansion ring. Background Art

[0002] For open expansion ring parts made of high-temperature alloy materials, the following processes are mostly used in the existing technology:

[0003] 1. Heat setting method for opening size processing: soak the parts in high-temperature hot oil, heat them to a certain temperature, then take them out for opening setting to meet the final opening size of the parts in free state. This processing method has low setting efficiency, poor effect, and is prone to overheating and deformation or damage of parts;

[0004] 2. Cold setting method for opening size processing: put the part into a special mold, press it to make it reach the set shape, and then cool and solidify. This processing method is relatively complex, costly, and not very versatile;

[0005] 3. Cold processing method for opening size processing: using lathe cutting, wire cutting, bench grinding, and shape correction to ensure the opening size of the parts in a free state, and then eliminating stress to stabilize the opening. This processing method requires high bench skill level, low efficiency, and low part qualification rate. Summary of the invention

[0006] In view of this, the present invention provides a method for shaping the opening of a high-temperature alloy expansion ring, which adopts a molding method of performing heat treatment on the expansion ring in a clamped state, thereby ensuring the opening size of the high-temperature alloy expansion ring part, and at the same time improving the manufacturing efficiency and qualified rate of the high-temperature expansion ring and reducing the processing cost.

[0007] The specific technical solution adopted by the present invention is:

[0008] A method for shaping the opening of a high-temperature alloy expansion ring comprises the following steps:

[0009] S101: Mechanically processed circular expansion ring;

[0010] S102: cutting an opening on the expansion ring;

[0011] S103: clamping the expansion ring with the cut opening and performing heat treatment in the clamped state to finalize the expansion ring;

[0012] The heat treatment method includes: heating the expansion ring to 845°C ± 10°C and keeping the temperature for 4

[0013] ±0.5h, after keeping warm, fill with 1Bar of argon and start cooling with a fan.

[0014] Furthermore, the heat treatment method also includes: after the first cooling with the fan, heating the temperature to 760°C±10°C again, keeping the temperature for 16±1h again, and filling with 1 Bar of argon gas and cooling with the fan again.

[0015] Furthermore, the vacuum degree during the second heat preservation process is (2-8)×10 -3 Pa.

[0016] Further, in S103, the fixture for clamping the expansion ring includes:

[0017] The bottom plate has a disc-shaped main body and an upper end surface provided with a receiving groove for engaging the bottom end of the expansion ring;

[0018] A pressing plate, mounted on the bottom plate, clamps the expansion ring in the receiving groove;

[0019] A positioning key is arranged at the opening to support the opening when the clamp is clamping the expansion ring.

[0020] Furthermore, a plurality of threaded holes uniformly distributed in the circumferential direction are concentrically arranged outside the ring of the receiving groove, and the number of the pressure plates is multiple groups, and the plurality of pressure plates cooperate with the plurality of threaded holes to clamp the expansion ring in the receiving groove.

[0021] Furthermore, the positioning key opens the expansion ring opening to a width that is 1.2-1.6 times the final required opening width.

[0022] Furthermore, the positioning key is installed on the base plate based on the threaded hole.

[0023] Furthermore, the clamp also includes a support rod and a lifting eye screw;

[0024] The support rod is installed at the center of the upper end surface of the base plate; the eye screw is installed at one end of the support rod away from the base plate.

[0025] The beneficial effects of the present invention are:

[0026] The present invention modifies the traditional expansion ring opening processing method, adopts a heat treatment shaping method, and ensures the opening size of the expansion ring part through a heat treatment shaping fixture. The present invention effectively improves the opening size qualification rate and opening stability of high-temperature alloy expansion ring parts, reduces the machining cost by combining heat treatment and opening shaping, and has promotion and application value in the field of heat treatment technology of high-temperature alloy expansion ring parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a structural schematic diagram of a clamp in a specific embodiment of the present invention;

[0029] Figure 2 It is an upper end view of the bottom plate in a specific embodiment of the present invention;

[0030] Figure 3 A top view of a pressing plate in a specific embodiment of the present invention;

[0031] Figure 4 It is a front cross-sectional view of a pressing plate in a specific embodiment of the present invention;

[0032] Figure 5 It is a structural schematic diagram of a positioning key in a specific implementation mode of the present invention;

[0033] Among them: 1. bottom plate; 11. receiving groove; 12. threaded hole; 2. pressure plate; 3. support rod; 4. lifting eye screw; 5. positioning key. DETAILED DESCRIPTION

[0034] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0035] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0036] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present disclosure, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0037] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present disclosure. The illustrations only show components related to the present disclosure rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0038] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0039] In one embodiment of the present invention, a method for shaping the opening of a high-temperature alloy expansion ring is provided, comprising the following steps:

[0040] S101: Mechanically processed circular expansion ring;

[0041] S102: cutting an opening on the expansion ring;

[0042] S103: clamping the expansion ring with the cut opening and performing heat treatment in the clamped state to finalize the expansion ring;

[0043] The heat treatment method comprises: heating the expansion ring to 845°C±10°C, keeping the temperature for 4±0.5h, filling with 1Bar of argon gas and cooling with a fan after keeping the temperature.

[0044] In this embodiment, the heat treatment method further includes: after the first cooling with the fan, heating the temperature to 760°C±10°C again, keeping the temperature for 16±1h again, and filling with 1Bar argon gas and cooling with the fan again.

[0045] In this embodiment, the vacuum degree during the second heat preservation process is (2-8)×10-3Pa.

[0046] In this embodiment, in S103, if Figure 1-5 As shown, the fixture for clamping the expansion ring includes:

[0047] The bottom plate 1 is in the shape of a disk, and the upper end surface is provided with a receiving groove 11 for engaging the bottom end of the expansion ring;

[0048] A pressing plate 2 is mounted on the bottom plate 1 to clamp the expansion ring in the receiving groove 11;

[0049] The positioning key 5 is arranged at the opening to support the opening when the clamp is clamping the expansion ring.

[0050] In this embodiment, a plurality of threaded holes 12 are concentrically arranged outside the ring of the receiving groove 11 and are evenly distributed in the circumferential direction. The number of the pressure plates 2 is multiple groups, and the plurality of pressure plates 2 cooperates with the plurality of threaded holes 12 to clamp the expansion ring in the receiving groove 11.

[0051] In this embodiment, the width of the expansion ring opening opened by the positioning key 5 is 1.2-1.6 times the final required opening width.

[0052] In this embodiment, the positioning key 5 is installed on the base plate 1 based on the threaded hole 12 .

[0053] In this embodiment, the clamp further includes a support rod 3 and a lifting eye screw 4;

[0054] The support rod 3 is installed at the center of the upper end surface of the base plate 1 ; the eye screw 4 is installed at one end of the support rod 3 away from the base plate 1 .

[0055] The following is a further description using a GH738 material expansion ring part as an example. The overall process route of this embodiment is:

[0056] Machining - cutting - heat treatment - opening size detection

[0057] The heat treatment is specifically as follows:

[0058] (1) Acceptance: Check if there are any defects such as bumps, rust, etc. on the surface of the parts.

[0059] (2) Cleaning: Use anhydrous ethanol and white gauze to clean the dirt on the surface of parts and fixtures and air dry them

[0060] (3) Clamping: The parts are loaded into a special fixture

[0061] (4) Heat treatment: heat to 845℃±10℃, keep warm for 4±0.5h, fill with 1Bar argon and cool with fan. Heat to 760℃±10℃, keep warm for 16±1h, fill with 1Bar argon and cool with fan. Vacuum degree during heat preservation: (2~8)×10-3Pa.

[0062] (5) Inspection: Check hardness, tensile properties, endurance, and specimens; check free opening size 90-110, 100% inspection.

[0063] The fixture of this embodiment is generally composed of a base plate 1, a pressure plate 2, a positioning key 5, a support rod 3, a lifting eye screw 4, and a bolt 6. Considering the influence of the heat treatment setting temperature, the fixture material is made of high temperature resistant GH625 material, wherein:

[0064] The bottom plate 1 adopts a 20mm thick disc-shaped structure to prevent the bottom plate 1 from deformation and fit the end surface of the part to ensure the flatness of the end surface of the part. The threaded hole 12 is processed on the bottom plate 1 to facilitate connection with the support rod 3, the positioning key 5, and the pressure plate 2.

[0065] The pressing plate 2 is designed for different end surface conditions of parts. The end surface of the part is composed of multiple uneven protrusions, so multiple single pressing plates 2 are used. Threaded holes 12 are processed on the pressing plate 2 to adjust the height of the pressing plate 2 and the parallelism with the base plate 1.

[0066] The positioning key 5 opens the opening of the expansion ring part. The rebound of the opening after the part is heat treated and finalized needs to be considered. The key width can be adjusted according to the final opening requirements of the part. The part requires an opening of 90-110mm, and the key width is 140mm.

[0067] The support rod 3 and the eye screw 4 are used for lifting parts and fixtures into the furnace, and are threadedly connected to the bottom plate 1 for easy disassembly and assembly.

[0068] Bolts are used to assemble and connect the various parts of the clamp. The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or replacements that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be based on the protection scope of the claims.

Claims

1. A method for shaping the opening of a high-temperature alloy expansion ring, characterized in that: The following steps are involved: S101: Mechanically processed circular expansion ring; S102: cutting an opening on the expansion ring; S103: clamping the expansion ring with the cut opening and performing heat treatment in the clamped state to finalize the expansion ring; The heat treatment method comprises: heating the expansion ring to 845°C±10°C, keeping the temperature for 4±0.5h, filling with 1Bar of argon gas and cooling with a fan after keeping the temperature.

2. The high-temperature alloy expansion ring opening shaping method according to claim 1, characterized in that: The heat treatment method further includes: after the first cooling with the fan, heating the temperature to 760°C±10°C again, keeping the temperature for 16±1h again, and filling with 1 Bar of argon gas and cooling with the fan again.

3. The high temperature alloy expansion ring opening shaping method according to claim 2, characterized in that: The vacuum degree in the second heat preservation process is (2-8)×10 -3 Pa.

4. The high temperature alloy expansion ring opening shaping method according to claim 3, characterized in that: In S103, the fixture for clamping the expansion ring includes: The bottom plate has a disc-shaped main body and an upper end surface provided with a receiving groove for engaging the bottom end of the expansion ring; A pressing plate, mounted on the bottom plate, clamps the expansion ring in the receiving groove; A positioning key is arranged at the opening to support the opening when the clamp is clamping the expansion ring.

5. The high temperature alloy expansion ring opening shaping method according to claim 4, characterized in that: A plurality of threaded holes uniformly distributed in the circumferential direction are concentrically arranged outside the ring of the receiving groove, and the number of the pressure plates is multiple groups, and the multiple pressure plates cooperate with the multiple threaded holes to clamp the expansion ring in the receiving groove.

6. The high temperature alloy expansion ring opening shaping method according to claim 5, characterized in that: The width of the expansion ring opening opened by the positioning key is 1.2-1.6 times the final required opening width.

7. The high temperature alloy expansion ring opening shaping method according to claim 6, characterized in that: The positioning key is installed on the base plate based on the threaded hole.

8. The high temperature alloy expansion ring opening shaping method according to claim 7, characterized in that: The clamp also includes a support rod and an eye screw; The support rod is installed at the center of the upper end surface of the base plate; the eye screw is installed at one end of the support rod away from the base plate.

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