Automatic polishing head structure for complex curved surface coating

Abstract

The invention relates to an automatic polishing head structure for a complex curved surface coating, and belongs to the field of surface treatment / polishing coatings. An automatic polishing head structure for a complex curved surface coating comprises a polishing wheel, a polishing piece and a fixed brush, a plurality of clamping grooves are formed in the outer circumference of the polishing wheel, the length direction of the clamping grooves is consistent with the radial direction of the polishing wheel, and the two ends of the clamping grooves are flush with the two side faces of the polishing wheel; one end of the grinding piece and one end of the fixed brush are clamped into the clamping groove, and the grinding piece and the fixed brush are arranged in a spaced mode. The method has the following advantages: 1, the activation effect of the complex curved surface coating and the binding force of the special coating are improved; 2, the removal amount of the special coating on the complex curved surface is controlled, and uniform and quantitative coating thickness is guaranteed; and 3, the diversity of the grinding wheel cloth is increased, and the effective contact property and toughness of the abrasive cloth strip during grinding are improved.

Description

Technical Field

[0001] The invention relates to an automatic grinding head structure for complex curved surface coatings, and belongs to the field of surface treatment / grinding coatings. Background Art

[0002] In order to meet the powerful shielding function, fighter jets need to be equipped with special coatings for air intakes. The adhesion of the special coatings for the air intakes is extremely high. If the coating falls off, it will cause abnormal operation of the engine, and in severe cases, it will directly cause the engine to explode and cause the aircraft to disintegrate in the air. Therefore, the pre-treatment of the special coatings for the air intakes is extremely important.

[0003] The commonly used method to improve the adhesion of coatings is to grind the substrate and coating. The air intake cavity has a complex structure and a small space, and manual grinding has poor accessibility. Automatic grinding can solve the current situation, but there is currently no suitable grinding head. A new type of automatic grinding head needs to be designed. The flexibility of the sandpaper must be guaranteed to facilitate the grinding and fitting of different curvatures. The sandpaper also needs to have a certain rigidity to improve the grinding and cutting force. Summary of the invention

[0004] The purpose of the present invention is to provide an automatic grinding head structure for complex curved surface coatings, which is suitable for performing surface grinding and activation treatment on special coatings of an air intake duct in an automatic grinding manner by a robot.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an automatic grinding head structure for complex curved surface coatings, including a grinding wheel, a grinding plate and a fixed brush, a plurality of slots are arranged along the outer circumference of the grinding wheel, the length direction of the slots is consistent with the radial direction of the grinding wheel, and the two ends of the slots are flush with the two side surfaces of the grinding wheel; one end of the grinding plate and the fixed brush are inserted into the slots, and the grinding plate and the fixed brush are arranged at intervals.

[0006] Furthermore, it also includes a rubber ring and a clamping ring; the rubber ring and the clamping ring are respectively arranged on both sides of the grinding wheel, and are used to fix the outer ring of the grinding wheel, thereby limiting the grinding sheet and the fixed brush on the grinding wheel.

[0007] Preferably, the grinding wheel is provided with 36 slots, each 4 slots form a group, and each group consists of a fixed brush and three grinding plates.

[0008] Preferably, the grinding sheet is 180-400 mesh sandpaper, and the grinding surfaces thereof are oriented in the same direction and in the direction of rotation of the grinding head structure.

[0009] Preferably, the sandpaper is divided into a plurality of sections along a direction perpendicular to the clamping end of the sandpaper.

[0010] Preferably, the end of the sandpaper away from the insertion end is sharpened and has a trapezoidal shape.

[0011] Preferably, the fixed brush is made of PET polyester material.

[0012] Preferably, the rotating axis of the grinding head structure is mounted on an end effector of a robot with seven degrees of freedom and orthogonal axes, and the rotating axis is CNC-finished using 7050-T7451-δ35.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] 1. Improved the activation effect of complex curved surface coatings and the bonding strength of special coatings;

[0015] 2. Control the removal amount of special coatings on complex curved surfaces to ensure uniform and quantitative coating thickness;

[0016] 3. Increase the diversity of grinding wheel cloths and improve the effective contact and toughness of the sandpaper strips during grinding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of an embodiment of the present invention (without the rubber ring installed);

[0018] Figure 2 It is a schematic diagram of the structure of an embodiment of the present invention (with a rubber ring installed);

[0019] Figure 3 Schematic diagram of the structure of grinding sandpaper in an embodiment of the present invention;

[0020] Figure 4 is a schematic diagram of the structure of an embodiment of the present invention installed on the end effector of a robot with seven degrees of freedom and orthogonal axes;

[0021] Figure 5 yes Figure 4 Usage status diagram;

[0022] Figure 1-5 1. Automatic grinding head structure; 1-1. Grinding sandpaper; 1-2. Fixed brush; 1-3. Grinding wheel; 1-3-1. Slot; 1-3-2. Rubber ring; 1-3-3. Rotating axis. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1-5 The present invention is further described in detail: an automatic grinding head structure for complex curved surface coatings includes a grinding wheel 1-3, a grinding sheet and a fixed brush 1-2; in this embodiment, the material of the grinding sheet is grinding sandpaper 1-1.

[0024] like Figure 3As shown, different types of sandpaper 1-1 (180-400 mesh) are cut into sections, and the ends are sharpened. In this embodiment, the ends are trapezoidal. By adopting this method, a flat sandpaper 1-1 can be divided into multiple sections, which can achieve a good sanding contact effect when facing complex curved surface parts such as air intakes, and is suitable for sanding areas with large curvatures.

[0025] like Figure 1 As shown, a plurality of slots 1-3-1 are arranged along the outer circumference of the grinding wheel 1-3. In this embodiment, the grinding wheel 1-3 is provided with 36 slots 1-3-1. The length direction of the slots 1-3-1 is consistent with the radial direction of the grinding wheel 1-3, and the two ends of the slots 1-3-1 are flush with the two side surfaces of the grinding wheel 1-3. At the same time, every four slots form a group, and each group is composed of a fixed brush 1-2 and three improved grinding sandpapers 1-1; Figure 2 As shown, the fixed brush 1-2 and the grinding sandpaper 1-1 are respectively inserted into the card slot 1-3-1 according to the above requirements, and then the outer ring is fixed with a rubber ring 1-3-2 and a clamping ring (not shown in the figure), and the rubber ring 1-3-2 and the clamping ring are respectively arranged on the left and right sides of the grinding wheel 1-3, so as to limit the grinding sandpaper 1-1 and the fixed brush 1-2 on the grinding wheel 1-3; to replace the fixed brush and the grinding sandpaper later, it is only necessary to remove the rubber ring; the rotating shaft 1-3-3 (the entire shaft body in the middle) arranged at the center of the grinding wheel 1-3 is CNC-finished by 7050-T7451-δ35;

[0026] The fixed brushes 1-2 are made of PET polyester material, which can enhance the rigidity of the entire grinding device and provide a stronger grinding force.

[0027] Take the polishing of a certain type of air intake duct special coating as an example:

[0028] (1) Grinding head production: Perform CNC finishing on aluminum alloy castings according to the designed digital model. Cut the grinding sandpaper 1-1 according to the requirements of the designed digital model, make a special fixed brush 1-2 (PET polyester material), assemble the grinding sandpaper and the fixed brush in a ratio of 3:1, and the effect is as follows: Figure 1-2 As shown, each set of three sandpapers 1-1 and one fixed brush 1-2 requires a total of 27 sandpapers and 9 fixed brushes;

[0029] (2) Use a small grinder to install the grinding head structure and verify the effects of grinding activation and cutting amount of the grinding head substrate and coating;

[0030] (3) After verifying the effect, install the new grinding head structure on the seven-degree-of-freedom orthogonal axis robot end effector, such as Figure 4 As shown;

[0031] (4) After cleaning the inner surface of the air intake duct, the inner surface of the air intake duct (composite material substrate) is polished and activated pre-treated using the polishing head structure;

[0032] (5) After the activation treatment is completed, the water film is continuously inspected or the coating thickness is inspected; after the inspection is qualified, the special coating is sprayed, and after the special coating is sprayed and solidified, the grinding head structure is used for grinding and cutting, such as Figure 5 As shown;

[0033] (6) The fixed brush and sandpaper in the grinding head device are both consumables; if the fixed brush is significantly deformed, it needs to be replaced in time; if the sandpaper is severely worn, it needs to be replaced in time.

Claims

1. An automatic grinding head structure for complex curved surface coating, comprising a grinding wheel, a grinding sheet and a fixed brush, characterized in that: A plurality of slots are arranged along the outer circumference of the grinding wheel, the length direction of the slots is consistent with the radial direction of the grinding wheel, and the two ends of the slots are flush with the two side surfaces of the grinding wheel; one end of the grinding sheet and the fixed brush is inserted into the slot, and the grinding sheet and the fixed brush are arranged at intervals.

2. The complex curved surface coating automatic grinding head structure according to claim 1 is characterized by: It also includes a rubber ring and a clamping ring; the rubber ring and the clamping ring are respectively arranged on both sides of the grinding wheel, and are used to fix the outer ring of the grinding wheel, thereby limiting the grinding sheet and the fixed brush on the grinding wheel.

3. The complex curved surface coating automatic grinding head structure according to claim 1 or 2, characterized in that: The grinding wheel is provided with 36 slots, and each 4 slots form a group, and each group consists of a fixed brush and three grinding sheets.

4. The complex curved surface coating automatic grinding head structure according to claim 1 or 2, characterized in that: The grinding sheet is a 180-400 mesh sandpaper, and the grinding surfaces thereof are oriented in the same direction and in the rotation direction of the grinding head structure.

5. The complex curved surface coating automatic grinding head structure according to claim 4 is characterized by: Cut the sandpaper into sections perpendicular to the snap-in end of the sandpaper.

6. The complex curved surface coating automatic grinding head structure according to claim 5 is characterized by: The end of the sandpaper away from the insertion end is sharpened and trapezoidal.

7. The complex curved surface coating automatic grinding head structure according to claim 1 is characterized by: The fixed brush is made of PET polyester material.

8. The complex curved surface coating automatic grinding head structure according to claim 1 is characterized by: The rotating axis of the grinding head structure is installed on the end effector of the seven-degree-of-freedom orthogonal axis robot, and the rotating axis is CNC-finished by 7050-T7451-δ35.

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