Aluminum alloy inner hole hard anodic oxide layer surface polishing device and using method thereof

Abstract

The invention belongs to the technical field of machining, and discloses an aluminum alloy inner hole hard anodic oxide layer surface polishing device and a using method thereof. One end of the mandrel and one end of the silica gel expansion sleeve are installed in a sealed mode; the other end of the silica gel expansion sleeve is fastened with the mandrel; the other end of the mandrel extends out of the silica gel expansion sleeve and is internally provided with a plug; the through hole is located in the outer circle of the mandrel in the silica gel expansion sleeve. Polishing abrasive paper is uniformly adhered to the silica gel expansion sleeve in the axial direction; and the actuating cylinder is sleeved outside the silica gel expansion sleeve. The pressure source is a pressure air source or a pressure water source. The aluminum alloy inner hole hard anodized layer surface polishing device can replace manual polishing, flexible expansion and contraction are achieved through the arrangement of the silica gel expansion sleeve, the polishing effect is good and even, the structure is simple, and economical efficiency is good.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, and in particular to a surface polishing device for a hard anodized layer of an inner hole of an aluminum alloy and a use method thereof. Background Art

[0002] Aircraft actuators and other parts need to be hard anodized on the inner hole surface to improve the surface hardness and wear resistance, and the surface quality requirements are also relatively high, generally around Ra0.1. The surface roughness of the aluminum alloy surface after hard anodizing generally decreases by 1-2 levels, so it is impossible to meet the above requirements by increasing the surface roughness level before surface treatment. It is necessary to improve the surface roughness by grinding, polishing and other means after hard anodizing the inner hole surface. Aircraft actuators are generally aluminum alloy parts. The inner hole size of such products ranges from hundreds of millimeters to more than ten millimeters. Some actuators with relatively small apertures or relatively large axial lengths are very inconvenient to grind and polish. The manual polishing method is to polish the inner hole with handheld polishing sandpaper. The equipment speed and polishing force are both high. The polishing force is difficult to control after long-term operation. The hard anodized layer after polishing is mostly uneven due to uneven force and uneven surface roughness, and it is very easy for the product size to exceed the tolerance requirements and lead to scrapping. The grinding method is limited by the poor grinding processability of aluminum alloy and the small diameter of the inner hole of the actuator. A small number of parts can be ground by honing machines, but honing machines are expensive and not widely used. The inner hole processing of the actuator parts with hard anodized inner hole has always been a difficult problem in the industry. Summary of the invention

[0003] Based on the problems existing in the prior art, the present invention proposes a surface polishing device for the hard anodized layer of the inner hole of aluminum alloy and a method for using the same. The device is cost-effective and can be used with a commonly used lathe. The corresponding polishing device can be designed according to the inner hole diameter and axial length of different actuators, and a certain processing strategy can be adopted to meet the higher roughness requirements (about Ra0.1) of the inner hole of the aluminum alloy after hard anodizing.

[0004] The technical solution of the present invention is: a surface polishing device for a hard anodized layer of an inner hole of an aluminum alloy, comprising a mandrel 3, a silicone expansion sleeve 4, a plug 5, a pressure source 7, and polishing sandpaper;

[0005] The core shaft 3 is in the shape of a long cylinder, with a mounting hole at the center of one end, an opening at the other end, and a connecting hole on the outer circle of the other end for connecting to the pressure source 7; multiple through holes are opened on the outer circle of the core shaft 3;

[0006] The silicone expansion sleeve 4 is shaped like a thermos kettle, with through holes at both ends;

[0007] The core shaft 3 is located in the silicone expansion sleeve 4, and one end of the two is sealed and installed; the other end of the silicone expansion sleeve 4 is fastened to the core shaft 3; the other end of the core shaft 3 extends out of the silicone expansion sleeve 4, and a plug 5 is installed therein;

[0008] The through hole is located on the outer circle of the core shaft 3 inside the silicone expansion sleeve 4;

[0009] The silicone expansion sleeve 4 is evenly pasted with polishing sandpaper in the axial direction;

[0010] The actuating cylinder 6 is sleeved on the outside of the silicone expansion sleeve 4 .

[0011] The pressure source 7 is a pressure gas source or a pressure water source. When the pressure source 7 is a pressure water source, the opening at the other end of the core shaft 3 is first filled with water, and then the pressure water is gradually injected through the connecting hole.

[0012] The axial length of the silicone expansion sleeve 4 is twice the length of the processing part actuator 6.

[0013] The silicone expansion sleeve 4 is made of silicone; silicone has a certain elasticity, and when the silicone expansion sleeve 4 is blocked at both ends, it expands to a certain extent under the pressure of injection.

[0014] The method for using the surface polishing device for the hard anodized layer of the inner hole of aluminum alloy is as follows:

[0015] Step 1. Connect and assemble the mandrel 3, the silicone expansion sleeve 4, the plug 5 and the pressure source 7 as required;

[0016] Step 2. Inflate the silicone expansion sleeve 4 by inflating air / water into the interior through the pressure source 7, and the outer diameter of the silicone expansion sleeve 4 is smaller than the inner hole diameter of the actuator 6;

[0017] Step 3. Paste polishing sandpaper 8 on the outer surface of the silicone expansion sleeve 4, and evenly paste several long strips of polishing sandpaper 8 in the circumferential direction and radial direction;

[0018] Step 4. The actuator 6 is clamped on the chuck, and the surface polishing device of the hard anodized layer of the inner hole of the aluminum alloy is clamped on the tool holder; the surface polishing device of the hard anodized layer of the inner hole of the aluminum alloy is coaxial with the actuator 6;

[0019] Step 5. Move the tool holder to drive the aluminum alloy inner hole hard anodized layer surface polishing device to extend into the actuator cylinder 6;

[0020] Step 6. Further inflate air / water into the aluminum alloy inner hole hard anodized layer surface polishing device to further expand the silicone expansion sleeve 4 until the expansion of the silicone expansion sleeve 4 drives the polishing sandpaper 8 to contact the inner hole of the actuator 6, and all the polishing sandpaper will not fall off and is in close contact with the position of the inner hole of the actuator 6 to be polished;

[0021] Step 7. Start the lathe, rotate the spindle, and use the automatic tool feeding function of the tool holder to achieve uniform polishing of the inner hole.

[0022] Beneficial effects of the present invention: The surface polishing device for the hard anodized layer of the inner hole of an aluminum alloy can replace manual polishing, and the flexible expansion and contraction of the silicone expansion sleeve can achieve good and uniform polishing effect, simple structure and good economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional view of a surface polishing device for a hard anodized layer on an inner hole of an aluminum alloy;

[0024] Figure 2 It is an overall schematic diagram of the surface polishing device of the hard anodized layer of the inner hole of aluminum alloy;

[0025] Figure 3 is a schematic diagram of the mandrel;

[0026] Figure 4 This is a schematic diagram of the silicone expansion sleeve.

[0027] In the figure: 1-bolt; 2-gasket; 3-core shaft; 4-silicone expansion sleeve; 5-plug; 6-actuator; 7-pressure source. DETAILED DESCRIPTION

[0028] pass Figure 1-Figure 2 As shown, a specific embodiment 1 of a surface polishing device for a hard anodized layer of an inner hole of an aluminum alloy is shown, comprising a bolt 1, a gasket 2, a core shaft 3, a silicone expansion sleeve 4, a plug 5, an actuator 6, a pressure air source, polishing sandpaper, a connecting pipe and a fixing clamp.

[0029] Furthermore, the bolt 1 is a standard part;

[0030] Furthermore, the gasket 2 is annular, with one side of the outer circle being rounded;

[0031] Further, the mandrel 3 is Figure 3 The core shaft 3 is in the shape of a long cylinder, with a mounting hole at the center of one end, which is a threaded hole; there are multiple through holes on the outer circle of the core shaft 3, and a hole is opened at the other end. A larger threaded hole is also opened on the outer circle of the other end for connecting with the connecting pipe.

[0032] Furthermore, the appearance of the silicone expansion sleeve 4 is shown in Figure 4 The material is silicone, the shape is a thermos, and there are holes at both ends; the axial length of the silicone expansion sleeve 4 is about twice the length of the processing part actuator 6; silicone has a certain elasticity, and when both ends are blocked, the air pressure can cause a certain expansion.

[0033] Furthermore, the plug 5 is cylindrical and has an interference fit with the hole at the other end of the core shaft 3 and is fixed and sealed by welding.

[0034] The actuator 6 is a simple demonstration of a processed part, and its inner hole is hard anodized.

[0035] The pressure gas source can provide a certain gas pressure.

[0036] The polishing sandpaper 8 is a polishing sandpaper with adhesive backing, and is in the shape of a long strip, and is evenly pasted along the axial direction of the silicone expansion sleeve 4.

[0037] The connecting pipe is a pipeline, which plays the role of transmitting pressurized air.

[0038] The position relationship of each structure: the bolt 1, the gasket 2, the core shaft 3, the silicone expansion sleeve 4, the plug 5, and the actuator 6 are in a coaxial relationship.

[0039] Under the action of the bolt 1 and the core shaft 3, the two gaskets 2 press the silicone expansion sleeve 4, so that one end of the silicone expansion sleeve 4 is sealed and airtight.

[0040] The right end of the silicone expansion sleeve 4 is fastened to the core shaft 3 by a fixed clamp to ensure that the silicone expansion sleeve 4 and the core shaft 3 are tightly fitted and airtight.

[0041] The method of using this embodiment is as follows:

[0042] 1. Assemble the bolt 1, gasket 2, mandrel 3, silicone expansion sleeve 4, plug 5, connecting pipe 9 and pressure gas source according to the above position requirements and connection relationship;

[0043] 2. Inflate the system through the pressure gas source and the connecting pipe to expand the silicone sleeve 4, but the outer diameter needs to be slightly smaller than the inner hole of the actuator;

[0044] 3. Paste polishing sandpaper 8 on the outer surface of the silicone expansion sleeve 4, and evenly paste several long strips of polishing sandpaper 8 in the circumferential direction and radial direction;

[0045] 4. The actuator 6 is clamped on the chuck of the ordinary lathe, and the assembled polishing device is clamped on the tool holder of the ordinary lathe and fixed by screws provided with the tool holder to ensure that the polishing device is coaxial with the actuator 6.

[0046] 5. The moving tool holder drives the polishing device into the actuator cylinder.

[0047] 6. Further inflate the interior of the device to further expand the silicone expansion sleeve 4. At this time, because the expansion space is small, and the expansion of the silicone expansion sleeve 4 drives the polishing sandpaper 8 to contact the inner hole of the actuator cylinder, all the polishing sandpaper will not fall off and can be in close contact with the position of the inner hole of the actuator cylinder that needs to be polished.

[0048] 7. Start the general lathe, rotate the spindle, and cooperate with the automatic tool feeding function of the tool holder to achieve uniform polishing of the inner hole.

[0049] pass Figure 1-Figure 2As shown, another specific embodiment is given, in which the pressure air source is changed to a pressure water source; water is first slowly filled through the water injection port at the right end of the core shaft, and then the pressure water is flushed into the interior through the connecting pipe to fill the system with water. The water inside can also play the role of expanding the silicone expansion sleeve 4, and the heat dissipation effect is better.

Claims

1. A surface polishing device for hard anodized layer of aluminum alloy inner hole, characterized in that: The device for polishing the surface of a hard anodized layer of an aluminum alloy inner hole comprises a mandrel (3), a silicone expansion sleeve (4), a plug (5), a pressure source (7), and polishing sandpaper; The core shaft (3) is in the shape of a long cylinder, with a mounting hole at the center of one end, an opening at the other end, and a connection hole on the outer circle of the other end for connecting to a pressure source (7); a plurality of through holes are opened on the outer circle of the core shaft (3); The silicone expansion sleeve (4) is shaped like a thermos kettle, with through holes at both ends; The core shaft (3) is located in the silicone expansion sleeve (4), and one end of the two are sealed and installed; the other end of the silicone expansion sleeve (4) is fastened to the core shaft (3); the other end of the core shaft (3) extends out of the silicone expansion sleeve (4), and a plug (5) is installed inside the silicone expansion sleeve; The through hole is located on the outer circle of the core shaft (3) inside the silicone expansion sleeve (4); Polishing sandpaper is evenly pasted on the silicone expansion sleeve (4) in the axial direction; The actuating cylinder (6) is sleeved on the outside of the silicone expansion sleeve (4).

2. The surface polishing device for the hard anodized layer of the inner hole of aluminum alloy according to claim 1 is characterized in that: The pressure source (7) is a pressure gas source or a pressure water source. When the pressure source (7) is a pressure water source, the opening at the other end of the core shaft (3) is first filled with water, and then the pressure water is gradually injected through the connecting hole.

3. The surface polishing device for the hard anodized layer of the inner hole of aluminum alloy according to claim 1 or 2, characterized in that: The axial length of the silicone expansion sleeve (4) is twice the length of the processing part actuator (6).

4. The surface polishing device for the hard anodized layer of the inner hole of aluminum alloy according to claim 1 or 2, characterized in that: The silicone expansion sleeve (4) is made of silicone; silicone has a certain elasticity, and when the silicone expansion sleeve (4) is blocked at both ends, it expands to a certain extent due to the injection pressure.

5. A method for using the surface polishing device for the hard anodized layer of the inner hole of an aluminum alloy according to any one of claims 1 to 4, characterized in that: The specific steps are as follows: Step 1. Connect and assemble the mandrel (3), silicone expansion sleeve (4), plug (5) and pressure source (7) as required; Step 2. Inflate the silicone expansion sleeve (4) with air / water through the pressure source (7), so that the outer diameter of the silicone expansion sleeve (4) is smaller than the inner diameter of the actuator (6); Step 3. Paste polishing sandpaper (8) on the outer surface of the silicone expansion sleeve (4), and evenly paste several long strips of polishing sandpaper (8) in the circumferential direction and radial direction; Step 4. The actuator (6) is clamped on the chuck, and the surface polishing device of the hard anodized layer of the inner hole of the aluminum alloy is clamped on the tool holder; the surface polishing device of the hard anodized layer of the inner hole of the aluminum alloy is coaxial with the actuator (6); Step 5. Move the tool holder to drive the aluminum alloy inner hole hard anodized layer surface polishing device into the interior of the actuator cylinder (6); Step 6. Further inflate air / water into the aluminum alloy inner hole hard anodized layer surface polishing device to further expand the silicone expansion sleeve (4) until the expansion of the silicone expansion sleeve (4) drives the polishing sandpaper (8) to contact the inner hole of the actuator cylinder (6), and all the polishing sandpaper will not fall off and will be in close contact with the inner hole of the actuator cylinder (6) to be polished; Step 7. Start the lathe, rotate the spindle, and use the automatic tool feeding function of the tool holder to achieve uniform polishing of the inner hole.

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