Aluminum alloy inner hole hard anodic oxide layer surface polishing device

Abstract

The utility model belongs to the technical field of machining, and discloses a surface polishing device for a hard anodized layer of an aluminum alloy inner hole. 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] This utility model relates to the field of machining technology, and in particular to a device for polishing the surface of hard anodized layer in the inner hole of aluminum alloy. Background Technology

[0002] Aircraft actuator cylinders and other parts require hard anodizing of their inner bore surfaces to improve surface hardness and wear resistance, with high surface quality requirements, typically around Ra0.1. The surface roughness of aluminum alloy surfaces generally decreases by 1-2 grades after hard anodizing, so the required surface roughness cannot be achieved simply by improving the initial surface roughness. Therefore, grinding and polishing are necessary to improve the surface roughness after hard anodizing of the inner bore surfaces. Aircraft actuator cylinders are generally made of aluminum alloy, with inner bore sizes ranging from hundreds of millimeters to tens of millimeters. Actuators with small bore diameters or large axial lengths are particularly difficult to grind and polish. Manual polishing involves hand-held sandpaper, which requires high equipment speed and polishing force. Prolonged operation makes it difficult to control the polishing force, resulting in uneven surface roughness of the hard anodized layer due to uneven stress. Furthermore, it easily leads to products exceeding dimensional tolerances and being scrapped. Grinding methods are limited by the poor machinability of aluminum alloys and the small diameter of the actuator cylinder's inner bore. A small number of parts can be ground using honing machines, but these machines are expensive and not widely used. Machining the inner bore of actuator cylinder parts with hard anodized inner bores has always been a challenge in the industry. Utility Model Content

[0003] Based on the problems existing in the prior art, this utility model proposes a surface polishing device for the hard anodized layer of aluminum alloy inner holes. This device is simple in cost and can be used with commonly used lathes. The 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 high roughness requirements (around Ra0.1) of the hard anodized aluminum alloy inner holes.

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

[0005] The mandrel 3 is a long cylindrical shape, with a mounting hole at the center of one end and an opening at the other end. A connecting hole is provided on the outer circumference of the other end for connecting to the pressure source 7; multiple through holes are opened on the outer circumference of the mandrel 3.

[0006] The silicone expansion sleeve 4 is shaped like a thermos and has through holes at both ends;

[0007] The mandrel 3 is located inside the silicone expansion sleeve 4, with one end of the two sealed together; the other end of the silicone expansion sleeve 4 is fastened to the mandrel 3; the other end of the mandrel 3 extends out of the silicone expansion sleeve 4, and a plug 5 is installed inside it;

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

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

[0010] The actuator 6 is fitted onto the outside of the silicone expansion sleeve 4.

[0011] The pressure source 7 is either a pressurized air source or a pressurized water source. When the pressure source 7 is a pressurized water source, water is first added from the opening at the other end of the spindle 3, and then pressurized water is gradually injected through the connecting hole.

[0012] The axial length of the silicone expansion sleeve 4 is twice the length of the actuating cylinder 6 of the processed part.

[0013] The silicone expansion sleeve 4 is made of silicone. Silicone has a certain elasticity. When both ends of the silicone expansion sleeve 4 are blocked, the pressure applied during insertion causes it to expand to a certain extent.

[0014] The specific steps for using the surface polishing device for the hard anodized layer of aluminum alloy internal holes are as follows.

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

[0016] Step 2. Inflate the silicone expansion sleeve 4 by filling it with air / water through the pressure source 7. The outer diameter of the silicone expansion sleeve 4 is smaller than the inner diameter of the actuator cylinder 6.

[0017] Step 3. Attach polishing sandpaper 8 to the outer surface of the silicone expansion sleeve 4, and evenly attach several strips of polishing sandpaper 8 in the circumferential and radial directions;

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

[0019] Step 5. The moving tool holder drives the aluminum alloy inner hole hard anodized layer surface polishing device to extend into the actuating cylinder 6;

[0020] Step 6. Further fill the polishing device with air / water into the hard anodized layer surface of the aluminum alloy inner hole, so that the silicone expansion sleeve 4 expands further until the silicone expansion sleeve 4 expands and drives the polishing sandpaper 8 to contact the inner hole of the actuator cylinder 6. All the polishing sandpaper will not fall off and will be in close contact with the polishing position in the inner hole of the actuator cylinder 6.

[0021] Step 7. Start the lathe, the spindle rotates, and with the automatic tool feed function of the tool post, the inner hole is polished evenly.

[0022] The beneficial effects of this utility model are: This aluminum alloy inner hole hard anodized layer surface polishing device can replace manual polishing. By setting a silicone expansion sleeve for flexible expansion and contraction, the polishing effect is good and uniform. It has a simple structure and is economical. Attached Figure Description

[0023] Figure 1 Cross-sectional view of a device for polishing the surface of a hard anodized layer on the inner hole of an aluminum alloy.

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

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

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

[0027] In the diagram: 1-bolt; 2-washer; 3-spindle; 4-silicone expansion sleeve; 5-plug; 6-actuator; 7-pressure source. Detailed Implementation

[0028] pass Figures 1-2 The image shows a specific embodiment 1 of a device for polishing the surface of a hard anodized layer in the inner hole of an aluminum alloy, including a bolt 1, a washer 2, a mandrel 3, a silicone expansion sleeve 4, a plug 5, an actuating cylinder 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 its outer circle rounded off;

[0031] Furthermore, the mandrel 3 is described in detail below. Figure 3 The mandrel 3 is a long cylindrical shape with a mounting hole at the center of one end. The mounting hole is a threaded hole. There are multiple through holes on the outer circle of the mandrel 3, and a hole at the other end. There is also a larger threaded hole on the outer circle of the other end for connecting to the connecting pipe.

[0032] Furthermore, the external shape of the silicone expansion sleeve 4 is shown below. Figure 4 The material is silicone, the shape is thermos-shaped, and there are holes at both ends; the axial length of the silicone expansion sleeve 4 is about twice the length of the actuator cylinder 6 of the processed part; 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 is interference-fitted with the hole at the other end of the mandrel 3, and is fixed and sealed by welding.

[0034] The actuator 6 is a simplified example of a machined part, with its inner hole hard anodized.

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

[0036] The polishing sandpaper 8 is an adhesive-backed polishing sandpaper, which is long and strip-shaped and is evenly pasted along the axial direction of the silicone expansion sleeve 4.

[0037] The connecting pipe is a conduit that serves to transmit pressurized air.

[0038] The structural relationships are as follows: Bolt 1, Washer 2, Mandrel 3, Silicone Expansion Sleeve 4, Plug 5, and Actuating Cylinder 6 are coaxial.

[0039] Under the action of bolt 1 and mandrel 3, the two gaskets 2 press the silicone expansion sleeve 4, making one end of the silicone expansion sleeve 4 sealed and airtight.

[0040] The right end of the silicone expansion sleeve 4 is fastened to the mandrel 3 with a fixing clamp to ensure that the silicone expansion sleeve 4 and the mandrel 3 fit tightly and do not leak air.

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

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

[0043] 2. Inflate the silicone sleeve 4 by pressurizing the system with air through the pressurized air source and connecting pipe, but the outer diameter needs to be slightly smaller than the inner hole of the actuator cylinder;

[0044] 3. Adhere polishing sandpaper 8 to the outer surface of the silicone expansion sleeve 4, and evenly adhere several long strips of polishing sandpaper 8 in the circumferential and radial directions;

[0045] 4. The actuator 6 is clamped on the chuck of a conventional lathe, and the assembled polishing device is clamped on the tool post of the conventional lathe. It is fixed by the screws and other fasteners on the tool post to ensure that the polishing device and the actuator 6 are coaxial.

[0046] 5. The moving tool holder drives the polishing device to extend into the actuating cylinder.

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

[0048] 7. Start the conventional lathe, the spindle rotates, and with the automatic tool feed function of the tool post, uniform polishing of the inner hole is achieved.

[0049] pass Figures 1-2As shown, another specific embodiment is given, in which the pressure air source is replaced with a pressure water source; water is first slowly added through the water inlet at the right end of the mandrel, and then pressure water is flushed into the system through the connecting pipe to fill the system with water. The water inside can also play the role of expanding the silicone sleeve 4, resulting in better heat dissipation.

Claims

1. A device for polishing the surface of a hard anodized layer in the inner hole of an aluminum alloy, characterized in that, The aluminum alloy inner hole hard anodized layer surface polishing device includes a mandrel (3), a silicone expansion sleeve (4), a plug (5), a pressure source (7), and polishing sandpaper; The mandrel (3) is a long cylindrical shape, with a mounting hole at the center of one end and an opening at the other end. A connecting hole is provided on the outer circle of the other end to connect to the pressure source (7); multiple through holes are opened on the outer circle of the mandrel (3). The silicone expansion sleeve (4) is shaped like a thermos and has through holes at both ends; The mandrel (3) is located inside the silicone expansion sleeve (4), with one end of the two sealed together; the other end of the silicone expansion sleeve (4) is fastened to the mandrel (3); the other end of the mandrel (3) extends out of the silicone expansion sleeve (4), and a plug (5) is installed inside it. The through hole is located on the outer circle of the mandrel (3) inside the silicone expansion sleeve (4); The silicone expansion sleeve (4) is uniformly pasted with polishing sandpaper in the axial direction; The silicone expansion sleeve (4) is covered with an actuating cylinder (6).

2. The surface polishing device for the hard anodized layer of aluminum alloy inner hole according to claim 1, characterized in that, The pressure source (7) is a pressure air source or a pressure water source; when the pressure source (7) is a pressure water source, water is first added from the opening at the other end of the spindle (3), and then pressure water is gradually injected through the connecting hole.

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

4. The surface polishing device for the hard anodized layer of aluminum alloy inner hole according to claim 1 or 2, characterized in that, The silicone expansion sleeve (4) is made of silicone. Silicone has a certain elasticity. When the two ends of the silicone expansion sleeve (4) are blocked, the pressure of the filling will cause a certain expansion.

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