Convex rotor copper bush extrusion device
By using an externally convex rotor copper bushing extrusion device, and utilizing the design of annular grooves and stepped conical bars, efficient and stable extrusion of rotor copper bushings is achieved, solving the problems of low efficiency and poor stability in existing technologies, and improving production efficiency and product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- AVIC NANJING ELECTROMECHANICAL TECH CO LTD
- Filing Date
- 2024-12-30
- Publication Date
- 2026-04-28
AI Technical Summary
In the existing technology, the extrusion process of rotor copper bushing is inefficient and unstable, which can easily lead to uneven stress on the conical mandrel and breakage, affecting product quality and the stability of the production process.
An externally convex rotor copper bushing extrusion device is adopted. By setting an annular groove and protrusion in the copper bushing mounting hole, combined with a stepped conical bar and an expansion sleeve, the continuous feeding of the conical section and the positioning of the stepped surface are used to achieve stable extrusion of the copper bushing and avoid the difficulty of pulling out the conical bar.
It improves extrusion efficiency by more than 60%, solves the problem of excessive tension in the cone-shaped extrusion device making it difficult to pull out, avoids loose bonding caused by multi-directional extrusion pressure, and improves production stability.
Smart Images
Figure CN224169162U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of rotor machining technology, and in particular relates to an extrusion device for an externally convex rotor copper bushing. Background Technology
[0002] The rotor is one of the key components in an aircraft's power transmission system, responsible for transmitting power to various parts of the aircraft through connections with various transmission devices. The rotor copper bushing plays a crucial auxiliary role in this process, significantly improving the overall performance, reliability, and lifespan of the system. The copper bushing needs to be fitted into the plunger bore and embedded into the plunger bore annular groove through a pressing method to ensure reliable installation. The reliability of the copper bushing installation is then verified through a hydraulic pressure test.
[0003] Existing technologies include a staged extrusion method using graded ball-head rods. A press drives multiple stages of ball-head rods to move longitudinally. The protruding part of the copper bushing is extruded into the rotor base annular groove by utilizing the interference fit between the diameter of the ball-head rod and the inner hole of the copper bushing. During this process, the rotor bears both longitudinal pressure and the pulling force when the ball-head rod is pulled out after extrusion. To reduce the force during pressing and pulling out and to make the copper bushing extrusion process more stable, it is necessary to manufacture multiple stages of ball-head rods to reduce the interference fit of each stage. This method involves a large number of ball-head rod stages, a long processing time, and multiple directions of force on the copper bushing, which can easily cause instability due to excessive longitudinal force.
[0004] Existing technology involves using a conical mandrel and an expansion sleeve to feed the mandrel downwards, causing the diameter of the expansion sleeve to expand. This forces the protruding part of the inner hole of the copper bushing into the annular groove of the rotor base. However, this method results in a gradual increase in interference caused by the feeding of the copper bushing. After the extrusion is completed, it becomes difficult to pull out the conical mandrel, which can easily lead to uneven stress and breakage of the mandrel, thus affecting product quality and the stability of the production process. Utility Model Content
[0005] The purpose of this invention is to improve the efficiency and quality of rotor copper bushing extrusion by providing an externally convex rotor copper bushing extrusion device.
[0006] The technical solution of this utility model is as follows: To achieve the above objective, a convex rotor copper bushing extrusion device is proposed. A copper bushing mounting hole is provided on the rotor base, and the mounting hole has an annular groove. The copper bushing to be extruded is installed in the mounting hole. The inner ring of the copper bushing to be extruded has a protrusion at a position corresponding to the depth of the annular groove. The extrusion device includes a base 1, a cover plate 2, an expansion sleeve 3, and a stepped conical rod 4. The rotor base is placed inside the base 1, and the cover plate 2 is sealed over the base 1. The cover plate 2 has concentric openings corresponding to the copper bushing mounting hole. The expansion sleeve 3 is inserted into the expansion sleeve positioning hole, with its bottom end face exceeding the protrusion depth of the inner ring of the copper bushing to be extruded; one end of the stepped conical rod 4 has a conical section, and the other end has a threaded section, with a positioning step surface provided between the conical section and the threaded section; one end of the stepped conical rod 4 with the conical section is inserted into the expansion sleeve 3; through the continuous feeding of the conical section, the protrusion of the inner ring of the copper bushing to be extruded is pressed outward to make it protrude outward and match the annular groove; when the positioning step surface contacts the bottom end face of the expansion sleeve 3, the expansion sleeve 3 can be pulled out at the same time as the stepped conical rod 4 is pulled out.
[0007] In one possible embodiment, the radial dimension of the bottom end of the conical section is determined by the inner diameter of the bottom end face of the expansion sleeve 3 in its free state, ensuring that when the bottom surface of the conical rod 4 is fed to be flush with the bottom surface of the expansion sleeve 3, the diameter of the bottom end of the conical section of the conical rod 4 is consistent with the inner diameter of the bottom end of the expansion sleeve 3. When the conical rod 4 continues to feed, the expansion sleeve 3 and the copper bushing are interference-fitted to generate extrusion force; the length dimension L of the conical section is determined by the required interference amount Δd and the taper S.
[0008] L=Δd / S
[0009] The calculation relationships between the length L of the conical section and the bottom diameter d1 of the conical rod, the taper S of the conical rod, the bottom diameter D of the copper bushing, and the interference Δd are as follows:
[0010] D +Δd1-d1 / S≤L≤D +Δd2-d1 / S
[0011] In one possible embodiment, the base 1 has a cylindrical cavity, the rotor base is placed in the cylindrical cavity, the upper end face of the base 1 is provided with a cross-shaped groove, and the outer edge of the cover plate 2 has a protrusion that matches the cross-shaped groove; the cover plate 2 is sealed to the cross-shaped groove of the base 1 through the protrusion; at the same time, it can realize the concentric positioning of the concentric expansion sleeve positioning hole and the copper bushing mounting hole.
[0012] In one possible embodiment, the base 1, cover plate 2, expansion sleeve 3, and stepped cone rod 4 are made of steel. Due to their different functions, the steel materials used are also different.
[0013] In one possible embodiment, the expansion sleeve 3 is cut into a petal shape by wire cutting. Since it needs to expand and contract repeatedly under the action of the cone rod 4, it is made of 65Mn spring steel, which gives it high strength, high hardness, high wear resistance and a certain degree of toughness.
[0014] In one possible embodiment, the cone bar 4 needs to withstand large axial forces and tension forces, so it is made of 440C material, which has high hardness after heat treatment.
[0015] In one possible embodiment, the expansion sleeve 3 needs to withstand a large axial force and tension force, and needs to have a certain elasticity, so it is made of spring steel.
[0016] In one possible embodiment, the base 1 and the cover plate 2 serve a supporting function, so ordinary 45 steel can be used.
[0017] The beneficial technical effects of this utility model are as follows:
[0018] 1. Compared with the prior art, this utility model provides an externally convex rotor copper bushing extrusion device with higher extrusion efficiency, improving the extrusion efficiency by more than 60%;
[0019] 2. This utility model solves the problem that the excessive tension force caused by the large mating surface of the conical bar extrusion device makes it difficult to pull out;
[0020] 3. This utility model solves the problem of multi-directional extrusion pressure generated during the extrusion process, and avoids the situation of loose bonding caused by longitudinal force on the copper bushing. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of a preferred embodiment of the present invention: an externally convex rotor copper bushing extrusion device.
[0022] Figure 2 This is a schematic diagram of the structure of the base 1 in a preferred embodiment of the present invention;
[0023] Figure 3 for Figure 2 A schematic diagram of the AA cross-section;
[0024] Figure 4 This is a schematic diagram of the structure of the cover plate 2 in a preferred embodiment of the present invention;
[0025] Figure 5 for Figure 4 A schematic diagram of the AA cross-section;
[0026] Figure 6 This is a schematic diagram of the expansion sleeve 3 according to a preferred embodiment of the present invention;
[0027] Figure 7for Figure 6 Sectional view along direction B;
[0028] Figure 8 for Figure 6 A schematic diagram of direction B;
[0029] Figure 9 This is a schematic diagram of the structure of the cone rod 4 in a preferred embodiment of the present invention;
[0030] Figure 10 This is a schematic diagram of the expansion sleeve before installation in a preferred embodiment of the present invention;
[0031] Figure 11 This is a schematic diagram of the expansion sleeve after installation in a preferred embodiment of the present invention. Detailed Implementation
[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0033] like Figure 1 As shown, an externally convex rotor copper bushing extrusion device is provided. The rotor base has a copper bushing mounting hole with an annular groove. The copper bushing to be extruded is installed in the mounting hole. The inner ring of the copper bushing to be extruded has a protrusion at a position corresponding to the depth of the annular groove. The extrusion device includes a base 1, a cover plate 2, an expansion sleeve 3, and a stepped conical rod 4. The rotor base is placed inside the base 1, and the cover plate 2 is sealed above the base 1. The cover plate 2 has concentric expansion sleeve positioning holes corresponding to the copper bushing mounting hole. The sleeve 3 is inserted into the positioning hole of the expansion sleeve, with its bottom end face exceeding the protrusion depth of the inner ring of the copper bushing to be compressed; one end of the stepped conical rod 4 has a conical section and the other end has a threaded section, with a positioning step surface provided between the conical section and the threaded section; one end of the stepped conical rod 4 with the conical section is inserted into the expansion sleeve 3; through the continuous feeding of the conical section, the protrusion of the inner ring of the copper bushing to be compressed is pressed outward to make it protrude outward and match the filling of the annular groove; when the positioning step surface contacts the bottom end face of the expansion sleeve 3, the expansion sleeve 3 can be pulled out at the same time as the stepped conical rod 4 is pulled out.
[0034] In one possible embodiment, the radial dimension of the bottom end of the conical section is determined by the inner diameter of the bottom end face of the expansion sleeve 3 in its free state, ensuring that when the bottom surface of the conical rod 4 is fed to be flush with the bottom surface of the expansion sleeve 3, the diameter of the bottom end of the conical section of the conical rod 4 is consistent with the inner diameter of the bottom end of the expansion sleeve 3. When the conical rod 4 continues to feed, the expansion sleeve 3 and the copper bushing are interference-fitted to generate extrusion force; the length dimension L of the conical section is determined by the required interference amount Δd and the taper S.
[0035] L=Δd / S
[0036] The calculation relationships between the length L of the conical section and the bottom diameter d1 of the conical rod, the taper S of the conical rod, the bottom diameter D of the copper bushing, and the interference Δd are as follows:
[0037] D +Δd1-d1 / S≤L≤D +Δd2-d1 / S
[0038] In one possible embodiment, such as Figures 2-3 As shown, the base 1 has a cylindrical cavity, and the rotor base is placed inside the cylindrical cavity. A cross-shaped groove is formed on the upper surface of the base 1. Figures 4-5 As shown, the outer edge of the cover plate 2 has a protrusion that matches the cross-shaped groove; the cover plate 2 is sealed to the cross-shaped groove of the base 1 through the protrusion; at the same time, it can realize the concentric positioning of the concentric expansion sleeve positioning hole and the copper bushing mounting hole.
[0039] In one possible embodiment, the base 1, cover plate 2, expansion sleeve 3, and stepped cone rod 4 are made of steel. Due to their different functions, the steel materials used are also different.
[0040] In one possible embodiment, such as Figures 6-8 As shown, the expansion sleeve 3 is cut into petal shape by wire cutting. Since it needs to expand and contract repeatedly under the action of the cone rod 4, it is made of 65Mn spring steel, which gives it high strength, high hardness, high wear resistance and a certain toughness.
[0041] In one possible embodiment, such as Figure 9 As shown, the cone rod 4 needs to withstand large axial force and tension force, so it is made of 440C material, which has high hardness after heat treatment.
[0042] In one possible embodiment, the expansion sleeve 3 needs to withstand a large axial force and tension force, and needs to have a certain elasticity, so it is made of spring steel.
[0043] In one possible embodiment, the base 1 and the cover plate 2 serve a supporting function, so ordinary 45 steel can be used.
[0044] This utility model relates to a process method for extruding rotor copper bushings, comprising the following steps:
[0045] S1. Place the rotor into the base of the extrusion fixture, cover it with the cover plate, aligning the 9 holes on the cover plate with the 9 holes on the part. Figure 10 As shown, place the expansion sleeve into the 9 holes of the part, place the tapered bar into the expansion sleeve, and use a press to press the upper end face of the tapered bar.
[0046] S2. For example Figure 11 As shown, during the pressing process of the press, the diameter of the expansion sleeve gradually increases until the stepped surface of the cone rod passes through the lower end face of the expansion sleeve. The tensioning force decreases, the expansion sleeve contracts, and the expansion sleeve and cone rod can be easily removed. The remaining holes are processed in the same way until the extrusion is completed.
[0047] This application relates to a copper bushing extrusion process, the principle of which is as follows:
[0048] The cover plate, cone bar, and expansion sleeve form the direction of force transmission. The cover plate's obstruction prevents longitudinal movement when the cone bar of the expansion sleeve is pressed down, while the radial diameter increases until the cone bar moves to a point where its step surface is lower than the lower end face of the expansion sleeve. At this point, the tension force disappears, and the extrusion ends. With the cooperation of the cone bar and the expansion sleeve, the protruding part of the copper bushing is squeezed into the rotor base annular groove. After the extrusion ends, the tension force disappears, and the expansion sleeve is in a free state and can be directly removed.
[0049] This application also relates to a copper bushing extrusion fixture, applied in the above-mentioned extrusion process, with reference to... Figures 2 to 8 It includes: a base, a cover plate, an expansion sleeve, and a conical rod, as shown in the assembly diagram below. Figure 1 The rotor base is placed inside the base. An uncompressed bushing is installed in the plunger hole of the rotor base. A cross groove is milled at the upper end of the base. The protruding part of the cover plate is aligned with the cross groove of the base and placed in. The 9-hole position is aligned and the expansion sleeve is placed in the hole. The expansion sleeve is cut into a petal shape. The outer circle of the expansion sleeve is expanded by the feed of the conical bar, and the copper bushing is squeezed into the annular groove of the rotor base.
[0050] The above method places the extrusion fixture on the press table of the press. The inner hole of the copper bushing, the outer circle of the expansion sleeve, the inner conical surface of the expansion sleeve, and the outer circle of the conical rod form angular positioning. The end face of the conical rod, the conical surface of the conical rod, the inner conical surface of the expansion sleeve, the outer circle of the expansion sleeve, and the flange form the power transmission for the extrusion process. The expansion sleeve is inserted into the copper bushing through the guide angle inside the hole of the copper bushing to align the angular position of the expansion sleeve. Since there is a perpendicularity requirement between the upper end face of the conical rod and the outer circle of the conical rod, the conical rod will not be tilted during the pressing process of the press. Figure 3
[0051] With the above scheme, during the feeding process of the cone bar, only the cone bar itself will generate axial movement. Under the action of the cone bar generating axial movement, the expansion sleeve will generate radial movement and the diameter will increase. Therefore, under this action, the copper bushing will only embed the protruding part into the rotor base ring groove under the action of radial force, without generating axial movement, and avoids the quality problems that may be caused by the axial movement of the copper bushing.
[0052] When the tapered bar moves through the lower end face of the expansion sleeve, the tension force disappears, the expansion sleeve returns to its free state, and the expansion sleeve and tapered bar can be directly removed.
[0053] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A convex rotor copper bushing extrusion device, characterized in that, The rotor base is provided with copper bushing mounting holes, and the copper bushing mounting holes have an annular groove. The copper bushing to be extruded is installed in the copper bushing mounting holes. The inner ring of the copper bushing to be extruded has a protrusion at the position corresponding to the annular groove, which matches the depth of the annular groove. The extrusion device includes a base (1), a cover plate (2), an expansion sleeve (3), and a stepped conical rod (4). The rotor base is placed in the base (1), and the cover plate (2) is sealed above the base (1). The cover plate (2) has concentric expansion sleeve positioning holes corresponding to the copper bushing mounting holes. The expansion sleeve (3) is inserted into the expansion sleeve. Inside the positioning hole, the bottom end face exceeds the protrusion depth of the inner ring of the copper bushing to be extruded; one end of the stepped cone bar (4) has a cone section and the other end has a threaded section, and a positioning step surface is provided between the cone section and the threaded section; one end of the stepped cone bar (4) with the cone section is inserted into the expansion sleeve (3); through the continuous feeding of the cone section, the protrusion of the inner ring of the copper bushing to be extruded is pressed outward so that it protrudes outward and matches the annular groove. When the positioning step surface contacts the bottom end face of the expansion sleeve (3), the expansion sleeve (3) can be pulled out at the same time as the stepped cone bar (4) is pulled out.
2. The convex rotor copper bushing extrusion device according to claim 1, characterized in that, The radial dimension of the bottom end of the conical section is determined by the inner diameter of the bottom end face of the expansion sleeve (3) in its free state, ensuring that when the bottom surface of the conical rod (4) is fed to be flush with the bottom surface of the expansion sleeve (3), the diameter of the bottom end of the conical section of the conical rod (4) is consistent with the inner diameter of the bottom end of the expansion sleeve (3). When the conical rod (4) continues to feed, the expansion sleeve (3) and the copper bushing are interference-fitted to generate extrusion force. The length dimension L of the conical section is determined by the required interference amount Δd and the taper S. L=Δd / S The calculation relationships between the length L of the conical section and the bottom diameter d1 of the conical rod, the taper S of the conical rod, the bottom diameter D of the copper bushing, and the interference Δd are as follows: (D +Δd1-d1) / S≤L≤(D +Δd2-d1) / S.
3. The convex rotor copper bushing extrusion device according to claim 1, characterized in that, The base (1) has a cylindrical cavity, and the rotor base is placed in the cylindrical cavity. The upper end face of the base (1) is provided with a cross-shaped groove, and the outer edge of the cover plate (2) has a protrusion that matches the cross-shaped groove. The cover plate (2) is sealed to the cross-shaped groove of the base (1) through the protrusion. At the same time, it can realize the concentric positioning of the concentric expansion sleeve positioning hole and the copper bushing mounting hole.
4. The externally convex rotor copper bushing extrusion device according to claim 1, characterized in that, The base (1), cover plate (2), expansion sleeve (3), and stepped cone rod (4) are made of steel.
5. The externally convex rotor copper bushing extrusion device according to claim 1, characterized in that, The expansion sleeve (3) is made of 65Mn spring steel and is cut into petal shape by wire cutting.
6. The convex rotor copper bushing extrusion device according to claim 4, characterized in that, The cone rod (4) is made of 440C material.
7. The convex rotor copper bushing extrusion device according to claim 4, characterized in that, The base (1) and cover plate (2) are made of ordinary 45 steel.