A special tool for milling edge of cockpit glass cover and use method thereof

Abstract

The present invention belongs to the field of aviation assembly technology, and proposes a special tool for milling the edges of a cockpit glass cover and a method of use. The special tool for milling the edges of a cockpit glass cover includes a locking handle, a pneumatic motor, a size adjustment mechanism, a forming milling cutter, a clamping wheel, an end face guide wheel, a fixed guide wheel and a dial indicator. The present invention introduces the concept of handheld pneumatic adjustable precision profiling and assembly for the first time in the on-site assembly process of an aircraft. It solves the problems of excessively high machining accuracy requirements for single parts, a large impact of elastic deformation of large-size parts on assembly accuracy, high intensity, low efficiency and poor quality of manual repair work. This development has confirmed the feasibility and obvious advantages of using the concept of adjustable precision profiling and assembly on-site, which has great promotion significance in other assembly links and has a driving effect on the advancement of aircraft assembly technology.

Description

Technical Field

[0001] The invention relates to the technical field of aviation assembly, and in particular to a special tool for milling the edge of a cockpit glass cover and a use method thereof. Background Art

[0002] The installation accuracy of aircraft cockpit glass is of great significance to the realization of aircraft stealth indicators. At the same time, the installation quality of aircraft cockpit glass is also related to the life safety of pilots. However, due to factors such as the processing accuracy of cockpit cover glass parts, the processing and assembly accuracy of cockpit cover frame, and the accumulation of errors during the assembly process, the installation of cockpit cover glass requires repeated adjustment and polishing of the cockpit cover glass edge, which has extremely low processing efficiency and high labor intensity for operators. Therefore, it is necessary to study an economical and fast processing method to process the edge of the cockpit cover glass.

[0003] The glass cover of the aircraft cockpit is made of organic glass, with a thickness of 16mm and a shape similar to the partial shape of an ellipsoid. It is necessary to process the specified shape and size along the edge of the cover to facilitate the next installation process. Considering the unfavorable factors such as the complex shape, large size, and large elastic deformation of the glass cover, the design adopts multiple sets of fixed guide wheels for support and multiple sets of clamping wheels for clamping. The inner circle of the cockpit cover is used for guiding, and the forming milling cutter driven by a pneumatic motor is used to mill the outer edge of the cockpit cover. At the same time, due to the characteristics of the material itself, a large amount of debris and dust will be generated during processing, so a dust removal function is added during the structural design. Summary of the invention

[0004] In order to improve the assembly quality and processing efficiency of aircraft cockpit glass and reduce the labor intensity of operators, a specific process analysis of the cockpit glass assembly process was carried out, and the feasibility of reserving finishing allowance and using tools for manual grinding was discussed. A special tool for cockpit glass cover milling was designed, and the use method and processing flow were proposed to process the edge thickness of the aircraft cockpit glass cover and ensure the assembly quality of the aircraft cockpit glass cover.

[0005] The technical solution of the present invention is as follows: a special tool for milling the edge of a cockpit glass cover, comprising a base plate 1, a handle 2, a locking handle, an air motor 4, a quick connector 5, a dust removal interface 6, a size adjustment mechanism 7, a chip guard plate 9, a forming milling cutter 10, a clamping wheel 11, an end guide wheel 12, a fixed guide wheel 13 and a dial indicator 14; the base plate 1 is a T-shaped plate, comprising a horizontal side and a vertical side; the handle 2 is mounted on the upper surface of the horizontal side of the base plate 1; a through groove is provided on the vertical side; the air motor 4 is mounted on one side of the vertical side of the base plate 1, and the dust removal interface 6 and the forming milling cutter 10 are mounted on the other side of the vertical side of the base plate 1; the dust removal interface 6 is funnel-shaped, and the forming milling cutter 10 is covered inside the dust removal interface 6, and the dust removal interface 6 is connected to a vacuum cleaner for dust removal; one end of the air motor 4 is connected to the forming milling cutter 10 to drive it to rotate, and a quick connector 5 is provided at the other end of the air motor 4 for connecting to the air duct; the bottom of the mounting seat of the air motor 4 is connected to the size adjustment mechanism 7, The size adjustment mechanism 7 is a screw for adjusting the position of the pneumatic motor 4; the mounting seat of the pneumatic motor 4 and the dust removal interface 6 form a semi-closed structure; the clamping wheel 11 and the fixed guide wheel 13 are respectively installed at the ends on both sides of the horizontal side of the base plate 1; every two clamping wheels 11 are a group and installed on a lever mechanism, the center of the lever mechanism is a core shaft, and the clamping wheel 11 rotates around the core shaft; the locking handle is a threaded structure, and a compression spring is connected between it and the lever mechanism; adjusting the locking handle squeezes the compression spring, which indirectly acts on the lever mechanism, and the clamping wheel 11 is then squeezed on the glass cover; the end guide wheel 12 is installed at both ends of the horizontal side of the base plate 1, and is located between the clamping wheel 11 and the fixed guide wheel 13; the chip guard plate 9 is vertically installed on the outside of the clamping wheel 11 on the horizontal side of the base plate 1. On the one hand, it prevents glass debris from splashing, and on the other hand, it forms a semi-closed structure with the protective cover of the forming milling cutter 10, so that the debris is more easily sucked out by the vacuum cleaner.

[0006] A micrometer 14 is installed on the horizontal side of the base plate 1 , and the end of the micrometer 14 contacts the mounting seat of the pneumatic motor 4 .

[0007] The pneumatic motor 4 and the forming milling cutter 10 are connected by fixing screws 15. The fixing screws 15 are removed to replace the forming milling cutter 10. The purpose of adjusting the pneumatic motor is achieved by adjusting the size adjustment mechanism 7, and finally the processing thickness accuracy of the cockpit glass cover is adjusted.

[0008] The end face guide wheel 12 is a ball bearing structure, which rolls and rubs against the upper surface of the cockpit glass cover during processing to prevent the parts from being scratched by tools during processing; the four fixed guide wheels 13 limit the position of the cockpit glass cover. A rubber sheath is installed on the handle 2 to prevent the operator's hands from being scratched due to long-term hand-held processing.

[0009] The locking handle includes a front locking handle 3 and a rear locking handle 8. The dust removal interface 6 is installed with an industrial vacuum cleaner to absorb glass debris during processing to prevent the operator from inhaling and causing lung diseases.

[0010] A method for using a special tool for milling an edge of a cockpit glass cover comprises the following steps:

[0011] Step 1. Loosen the locking handle, the end face guide wheel 12 is pressed against the front edge of the canopy, and the clamping handle at the front edge of the canopy is locked;

[0012] Step 2. The cabin cover is slowly pushed and cut at the forming milling cutter 10;

[0013] Step 3. After the cut edge enters the clamping wheel area, lock the clamping handle there;

[0014] Step 4. Measure the cut part, calculate the remaining allowance, adjust the tool cutting amount, and cut again.

[0015] Before step 1, the cutting accuracy is adjusted, specifically, the dial indicator 14 is installed to the tool measurement position, the size adjustment mechanism 7 is adjusted, the number displayed on the dial indicator is observed, and the forming milling cutter 10 is adjusted to the target position.

[0016] Driven by high-pressure gas, it is designed for milling the edge of the aircraft cockpit glass cover, improving the cockpit installation accuracy, improving the overall aerodynamic performance of the aircraft body, reducing the labor intensity of assemblers, reducing the error probability caused by human factors during the construction process, and reducing processing defects.

[0017] Beneficial effects of the invention: The tool of the invention introduces the concept of handheld pneumatic adjustable precision profiling and assembly for the first time in the on-site assembly process of aircraft. It solves the problems of too high precision requirements for single parts, large elastic deformation of large-sized parts affecting assembly precision, and high intensity, low efficiency and poor quality of manual repair. This research and development confirms the feasibility and obvious advantages of using the concept of adjustable precision profiling and assembly on-site, and has great promotion significance in other assembly links. It has a driving effect on the advancement of aircraft assembly technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the processing position of the cockpit cover glass; (a) is the overall schematic diagram; (b) is the detailed diagram;

[0019] Figure 2 This is a schematic diagram of the processing principle of the special tool for milling the edge of the cockpit glass cover;

[0020] Figure 3 This is a schematic diagram of the rear side of the special tool for milling the edge of the cockpit glass cover;

[0021] Figure 4 This is a schematic diagram of the front side of the special tool for milling the edge of the cockpit glass cover;

[0022] Figure 5This is a schematic diagram of the processing status of the special tool for milling the edge of the cockpit glass cover;

[0023] Figure 6 A top view of the cutting accuracy adjustment method of the special tool for milling the edge of the cockpit glass cover;

[0024] Figure 7 This is a schematic diagram of the method for adjusting the cutting accuracy of the special tool for milling the edge of the cockpit glass cover;

[0025] Figure 8 A schematic diagram of the tool replacement method for the special tool for milling the edge of the cockpit glass cover;

[0026] Fig. 9 Schematic diagram of the special tool for milling the edge of the cockpit glass cover.

[0027] In the figure: 1-base plate; 2-handle; 3-front locking handle; 4-pneumatic motor; 5-quick connector; 6-dust removal interface; 7-size adjustment mechanism; 8-rear locking handle; 9-chip guard plate; 10-forming milling cutter; 11-pressure wheel; 12-end guide wheel; 13-fixed guide wheel; 14-dial indicator; 15-fixing screw; 16-special limit wrench; 17-special tightening wrench. DETAILED DESCRIPTION

[0028] Figure 5 This is a schematic diagram of the processing status of the special tool for milling the edge of the cockpit glass cover; the steps are as follows:

[0029] 1. Clean the work area and make sure there are no interfering objects during cleaning.

[0030] 2. Place the cockpit glass cover to be processed on the tooling rack.

[0031] 3. Loosen the front locking handle 3 and the rear locking handle 8 of the tool, and place the tool on the front edge of the cockpit glass cover; lock the front locking handle 3 after the tool end face guide wheel 12 is tightly attached to the front edge of the cockpit glass cover;

[0032] 4. Hold the tool handle firmly, start the tool, and slowly push the tool at a steady and uniform speed to cut forward along the inner arc of the cockpit cover.

[0033] 5. After the cut edge enters the rear clamping wheel area, lock the rear locking handle 8.

[0034] 6. After cutting is completed, remove the tool and clean the chips from the working area and the tool.

[0035] 7. Measure the cut part, calculate the remaining allowance, adjust the tool cutting amount, and cut again. Cutting can be done multiple times according to the allowance size and accuracy requirements.

[0036] 8. Check that the section size and accuracy meet the requirements.

[0037] Figure 6 , Figure 7 Schematic diagram of a tool cutting accuracy adjustment method, the tool cutting accuracy adjustment method comprises the following steps;

[0038] 1. Install the adjustment display dial indicator 14 to the tool measurement position. When using the tool daily, remove the dial indicator to prevent damage to the dial indicator 14.

[0039] 2. Gently loosen the fixing screws of the air motor 4 mounting base.

[0040] 3. Turn the size adjustment mechanism 7, observe the number displayed on the dial indicator 14, and adjust the forming milling cutter 10 to the appropriate position.

[0041] 4. Tighten the fixing screws of the air motor 4 mounting base, and make sure to apply force evenly and reliably.

[0042] 5. Check the tool and gently turn the tool to observe whether there is any interference.

[0043] 6. After adjustment is completed, remove the dial indicator 14.

[0044] Figure 8 , Fig. 9 It is a schematic diagram of a tool tool replacement method, and the tool replacement method using a special limit spanner 16 and a special tightening spanner 17 includes the following steps;

[0045] 1. Loosen the four fixing screws 15 and remove the pneumatic motor 4 and the forming milling cutter 10 as a whole.

[0046] 2. Use the special limit spanner 16 and the special tightening spanner 17 to loosen the chuck, take out the forming milling cutter 10, replace the new forming milling cutter 10 and re-tighten it. The positioning surface on the forming milling cutter 10 should be in close contact with the washer and the chuck.

[0047] 3. Reinstall the pneumatic motor and the forming milling cutter 10 after the tool is replaced, and tighten the screws 15 firmly.

[0048] 4. Manually check whether the forming milling cutter 10 has any interference or inflexible rotation.

[0049] 5. Complete the replacement of the forming milling cutter 10.

Claims

1. A special tool for milling the edge of a cockpit glass cover, characterized in that: The special tool for milling the edge of a cockpit glass cover comprises a base plate (1), a handle (2), a locking handle, an air motor (4), a quick connector (5), a dust removal interface (6), a size adjustment mechanism (7), a chip guard plate (9), a forming milling cutter (10), a clamping wheel (11), an end face guide wheel (12), a fixed guide wheel (13) and a dial indicator (14); the base plate (1) is a T-shaped plate, comprising a horizontal side and a vertical side; the handle (2) is mounted on the upper surface of the horizontal side of the base plate (1); the vertical side is opened A through groove is provided; the pneumatic motor (4) is mounted on one vertical side of the base plate (1); the dust removal interface (6) and the forming milling cutter (10) are mounted on the other vertical side of the base plate (1); the dust removal interface (6) is funnel-shaped, the forming milling cutter (10) is covered inside the dust removal interface (6), and the dust removal interface (6) is connected to a dust collector for dust removal; one end of the pneumatic motor (4) is connected to the forming milling cutter (10) to drive it to rotate, and the other end of the pneumatic motor (4) is provided with a quick connector (5) for connecting to an air duct; the pneumatic motor The bottom of the mounting seat of the pneumatic motor (4) is connected to a size adjustment mechanism (7), which is a lead screw for adjusting the position of the pneumatic motor (4); the mounting seat of the pneumatic motor (4) and the dust removal interface (6) form a semi-enclosed structure; the clamping wheel (11) and the fixed guide wheel (13) are respectively installed at the ends of both sides of the horizontal side of the bottom plate (1); every two clamping wheels (11) form a group and are installed on a lever mechanism, the center of the lever mechanism is a core shaft, and the clamping wheel (11) rotates around the core shaft. The locking handle comprises a front locking handle (3) and a rear locking handle (8), both of which are threaded structures, and a compression spring is connected between the front locking handle and the lever mechanism; the locking handle is adjusted to squeeze the compression spring, which indirectly acts on the lever mechanism, and the clamping wheel (11) is then squeezed on the glass cover; the end face guide wheel (12) is installed at both ends of the horizontal side of the base plate (1) and is located between the clamping wheel (11) and the fixed guide wheel (13); the chip guard plate (9) is vertically installed on the outer side of the clamping wheel (11) on the horizontal side of the base plate (1).

2. The special tool for milling the edge of a cockpit glass cover according to claim 1, characterized in that: A micrometer (14) is installed on the horizontal side of the base plate (1), and the end of the micrometer (14) contacts the mounting seat of the pneumatic motor (4).

3. The special tool for milling the edge of cockpit glass cover according to claim 1, characterized in that: The pneumatic motor (4) and the forming milling cutter (10) are connected via a fixing screw (15), and the forming milling cutter (10) can be replaced by removing the fixing screw (15).

4. The special tool for milling the edge of cockpit glass cover according to claim 1, characterized in that: The end face guide wheel (12) is a ball bearing structure; and a rubber sleeve is installed on the handle (2).

5. A method for using the special tool for milling the edge of a cockpit glass cover as claimed in claim 1, characterized in that: The steps include: Step 1. Loosen the front locking handle (3) and the rear locking handle (8), the end guide wheel (12) is pressed against the front edge of the canopy, and the front locking handle (3) at the front edge of the canopy is locked; Step 2: The cabin cover is slowly pushed and cut at the forming milling cutter (10); Step 3. After the cut edge enters the pinch wheel area, tighten the rear locking handle (8); Step 4. Measure the cut part, calculate the remaining allowance, adjust the tool cutting amount, and cut again.

6. The method for using the special tool for milling the edge of a cockpit glass cover according to claim 5, characterized in that: Before step 1, the cutting accuracy is adjusted, specifically, the dial indicator (14) is installed to the tool measurement position, the size adjustment mechanism (7) is adjusted, the number displayed on the dial indicator is observed, and the forming milling cutter (10) is adjusted to the target position.

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