CN115533173A - Special tool for milling edges of cabin glass covers and using method - Google Patents

Abstract

The invention belongs to the technical field of aviation assembly, and provides a special tool for milling an edge of a cabin glass cover and a using method thereof. The special tool for milling the edges of the cabin glass covers comprises a locking handle, a pneumatic motor, a size adjusting mechanism, a forming milling cutter, a pressing wheel, an end face guide wheel, a fixed guide wheel and a dial indicator. The invention introduces the concepts of handheld pneumatic type adjustable precision profiling machining and assembling in the field assembling process of the airplane for the first time. The problems that the requirement on the machining precision of a single part is too high, the elastic deformation of a large-size part has great influence on the assembly precision, the strength of a manual repair worker is high, the efficiency is low, the quality is poor and the like are solved. The research proves the feasibility and the obvious advantages of the on-site adoption of the adjustable precision copying machining and assembling concept, has great popularization significance in other assembling links, and has a promoting effect on the progress of the airplane assembling process.

Description

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

technical field

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

Background technique

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 safety of pilots. However, due to factors such as the processing accuracy of the canopy glass parts, the processing and assembly accuracy of the canopy frame, and the accumulation of errors in the assembly process, it is necessary to repeatedly adjust and polish the edge of the canopy glass when installing the canopy glass, and the processing efficiency is extremely low. The labor intensity is high, so it is necessary to study an economical and quick processing method to process the edge of the canopy glass.

The glass cover of the aircraft cockpit is a plexiglass material 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 canopy to facilitate the next installation process. Considering the unfavorable factors such as complex shape, large size, and large elastic deformation of the glass canopy, multiple sets of fixed guide wheels are used for support in the design, and multiple sets of compression wheels are used for compression. A motor-driven form milling cutter mills the outside edge of the canopy. At the same time, due to the characteristics of the material itself, a large amount of debris and dust will be generated during processing, and the dust removal function is added in the structural design.

Contents of the invention

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

The technical solution of the present invention: a special tool for edge milling of the cockpit glass cover, including a bottom 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 baffle 9, a forming Milling cutter 10, pressing wheel 11, end face guide wheel 12, fixed guide wheel 13 and dial indicator 14; base plate 1 is a T-shaped plate, including horizontal side and vertical side; handle 2 is installed on the upper surface of base plate 1 horizontal side; There is a through slot on the vertical side; the air motor 4 is installed on the vertical side of the bottom plate 1, the dust removal interface 6 and the forming milling cutter 10 are installed on the other vertical side of the bottom plate 1; the dust removal interface 6 is funnel-shaped, and the forming milling cutter 10 packs Covering the inside of the dust removal interface 6, 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 the other end of the air motor 4 is provided with a quick connector 5 for connecting to the air duct; the installation of the air motor 4 The bottom of the seat is connected with a size adjustment mechanism 7, and the size adjustment mechanism 7 is a lead screw for adjusting the position of the air motor 4; the mounting seat of the air motor 4 and the dust removal interface 6 form a semi-closed structure; the pressing wheel 11 and the fixed guide wheel 13 are respectively Installed on the ends of both sides of the horizontal side of the bottom plate 1; every two pressing wheels 11 form a group and are installed on the lever mechanism. The center of the lever mechanism is a mandrel, and the pressing wheel 11 takes the mandrel as the rotation center; locking The handle is a threaded structure, and a compression spring is connected between it and the lever mechanism; adjust the locking handle to squeeze the compression spring, which indirectly acts on the lever mechanism, and the pressing wheel 11 is further squeezed on the glass cover; the end guide wheel 12 is installed on the bottom plate 1 Both ends of the horizontal side are located between the pinch wheel 11 and the fixed guide wheel 13; the chip baffle 9 is vertically installed on the outside of the pinch wheel 11 on the horizontal side of the bottom plate 1, on the one hand, it prevents glass debris from splashing, on the other hand, it is compatible with the molding The milling cutter 10 protective cover forms a semi-closed structure, so that debris is more easily sucked out by the vacuum cleaner.

A dial indicator 14 is installed on the horizontal side of the base plate 1 , and its end is in contact with the mounting seat of the air motor 4 .

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

The end face guide wheels 12 are of ball bearing structure, which roll and rub against the upper surface of the cockpit glass cover during processing to prevent parts from being scratched by tools during processing; 4 fixed guide wheels 13 play the role of limiting the position of the cockpit glass cover. A rubber sheath is installed on the handle 2 to avoid hand abrasion of the operator due to long-term hand-held processing.

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, so as to avoid being inhaled by the operator and causing lung diseases.

A method for using a special tool for edge milling a cockpit glass cover, comprising the following steps:

Step 1. Loosen the locking handle, the end guide wheel 12 is tightly attached to the front edge of the cabin cover, and lock the compression handle on the front edge of the cockpit cover;

Step 2. Slowly push the canopy and cut at 10 places with the forming milling cutter;

Step 3. After the cut edge enters the pressing wheel area, lock the pressing handle there;

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

Before the step 1, the cutting accuracy is adjusted, specifically: install the dial indicator 14 to the tool measurement position, adjust the size adjustment mechanism 7, observe the number displayed by the dial indicator, and adjust the forming milling cutter 10 to the target position.

Driven by high-pressure gas, it is designed to mill the edge of the glass cover of the aircraft cockpit, improve the installation accuracy of the cockpit, improve the overall aerodynamic performance of the airframe, reduce the labor intensity of assemblers, reduce the error rate caused by human factors in the construction process, and reduce processing defect.

Beneficial effects of the present invention: the tool of the present invention introduces the concept of hand-held pneumatic adjustable precision profiling processing and assembly in the on-site assembly process of aircraft for the first time. It solves the problems of excessively high processing precision requirements for a single part, large-scale parts elastic deformation has a great influence on assembly precision, and manual repairers with high strength, low efficiency, and poor quality. This development has confirmed the feasibility and obvious advantages of adopting adjustable precision profiling processing and assembly concepts on site, and has great promotion significance in other assembly links. It has a driving effect on the progress of aircraft assembly technology.

Description of drawings

Figure 1 is a schematic diagram of the processing position of the canopy glass; (a) is an overall schematic diagram; (b) is a detailed diagram;

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

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

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

Figure 5 is a schematic diagram of the processing state of the special tool for edge milling of the cockpit glass cover;

Fig. 6 is a top view of the cutting precision adjustment method of the special tool for edge milling of the cockpit glass cover;

Fig. 7 is a schematic diagram of the cutting accuracy adjustment method of the special tool for edge milling of the cockpit glass cover;

Fig. 8 is a schematic diagram of the tool replacement method of the special tool for edge milling of the cockpit glass cover;

Fig. 9 is a schematic diagram of a special tool for edge milling of the cockpit glass cover.

In the figure: 1-bottom plate; 2-handle; 3-front locking handle; 4-air motor; 5-quick connector; 6-dust removal interface; 7-size adjustment mechanism; 8-rear locking handle; Plate; 10-forming milling cutter; 11-pressing wheel; 12-end guide wheel; 13-fixed guide wheel; 14-percent indicator; 15-fixing screw; 16-special limit wrench; .

detailed description

Figure 5 is a schematic diagram of the processing state of the special tool for milling the glass cover of the cockpit; the steps are as follows,

1. Clean up the working area to ensure that there are no interfering objects.

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

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; the guide wheel 12 on the end surface of the tool is closely attached to the front edge of the cockpit glass cover, and then lock the front locking handle 3;

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.

5. Lock the rear locking handle 8 after the cut edge enters the area of the rear pressing wheel.

6. After the cutting is completed, remove the tool and remove chips from the working area and the tool.

7. Measure the cut part, calculate the remaining allowance, adjust the cutting amount of the tool, and cut again. According to the size of the allowance and the precision requirements, the cutting can be divided into several times.

8. Check that the size and precision of the cut surface meet the requirements.

Figure 6 and Figure 7 are schematic diagrams of the method for adjusting the cutting precision of the tool, and the method for adjusting the cutting precision of the tool includes the following steps;

1. Install the adjustment display dial indicator 14 to the tool measurement position. During daily use of the tool, the dial indicator is taken off to prevent the dial indicator 14 from being damaged.

2. Gently loosen the set screw of the air motor 4 mount.

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

4. Tighten the fixing screws of the air motor 4 mounting base, and pay attention to the uniform and reliable force.

5. Check the tool, turn the tool slightly to see if there is any interference.

6. After the adjustment is completed, remove the dial gauge 14.

Fig. 8 and Fig. 9 are schematic diagrams of the tool replacement method, and the tool replacement method with the special limit wrench 16 and the special fastening wrench 17 includes the following steps;

1. Loosen the four fixing screws 15, and take out the air motor 4 and the forming milling cutter 10 as a whole.

2. Use the special limit wrench 16 and the special tightening wrench 17 to loosen the collet, take out the forming milling cutter 10, replace it with a new forming milling cutter 10 and re-lock it. The positioning surface on the forming milling cutter 10 should be close to the washer and the chuck.

3. Reinstall the air motor and the forming milling cutter 10 after the cutter has been replaced, and tighten the locking screw 15 firmly.

4. Manually check whether there is interference in the rotation of the forming milling cutter 10 and whether the rotation is inflexible.

5. Complete the replacement of the forming milling cutter 10 .

Claims (6)

1. A special tool for milling edge of cockpit glass cover, characterized in that, the special tool for milling edge of cockpit glass cover includes base plate (1), handle (2), locking handle, air motor (4), quick connector (5) , dust removal interface (6), size adjustment mechanism (7), chip guard (9), forming milling cutter (10), pressure wheel (11), end face guide wheel (12), fixed guide wheel (13) and sub table (14); the base plate (1) is a T-shaped plate, including horizontal and vertical sides; the handle (2) is installed on the upper surface of the horizontal side of the base plate (1); the vertical side has a through slot; the air motor (4 ) is installed on the vertical side of the bottom plate (1), and the dust removal interface (6) and the forming milling cutter (10) are installed on the other vertical side of the bottom plate (1); the dust removal interface (6) is funnel-shaped, and the forming milling cutter (10 ) is wrapped 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 the other end of the air motor (4) is provided with a quick connector ( 5), used to connect the air duct; the bottom of the mounting seat of the air motor (4) is connected to the size adjustment mechanism (7), and the size adjustment mechanism (7) is a lead screw for adjusting the position of the air motor (4); the air motor (4) ) and the dust removal interface (6) to form a semi-closed structure; the pinch wheel (11) and the fixed guide wheel (13) are respectively installed at the ends of the bottom plate (1) on both sides of the horizontal side; every two pinch wheels (11) is a group, is installed on the lever mechanism, and the center of the lever mechanism is a mandrel, and the pinch wheel (11) is the center of rotation with the mandrel; The locking handle is a threaded structure, which connects a compression spring with the lever mechanism; Adjust the locking handle to squeeze the compression spring, which acts indirectly on the lever mechanism, and the pressure wheel (11) is further squeezed on the glass cover; the end face guide wheel (12) is installed at both ends of the horizontal side of the bottom plate (1), Between the pinch wheel (11) and the fixed guide wheel (13); the chip baffle (9) is vertically installed on the outside of the pinch wheel (11) on the horizontal side of the base plate (1). 2. The special tool for edge milling of the cockpit glass cover according to claim 1, characterized in that a dial indicator (14) is installed on the horizontal side of the bottom plate (1), and its end is connected with the mounting seat of the air motor (4) touch. 3. The special tool for edge milling of the cockpit glass cover according to claim 1, characterized in that, the air motor (4) and the forming milling cutter (10) are connected by a fixing screw (15), and the fixing screw (15) is removed , realize changing forming milling cutter (10). 4. The special tool for edge milling of the cockpit glass cover according to claim 1, characterized in that, the end surface guide wheel (12) is a ball bearing structure; a rubber sheath is installed on the handle (2). 5. A method for using a special tool for edge milling of a cockpit glass cover, characterized in that the steps are as follows: Step 1. Loosen the locking handle, the end guide wheel (12) is tightly attached to the front edge of the cabin cover, and lock the compression handle on the front edge of the cockpit cover; Step 2. Slowly push the canopy and cut it at the forming milling cutter (10); Step 3. After the cut edge enters the pressing wheel area, lock the pressing handle there; Step 4. Measure the cut part, calculate the remaining allowance, adjust the cutting amount of the tool, and cut again. 6. The method of using the special tool for edge milling of the cockpit glass cover according to claim 5, characterized in that the cutting accuracy is adjusted before the step 1, specifically: install the dial indicator (14) to the tool measurement position, adjust The size adjustment mechanism (7) observes the number displayed on the dial indicator, and adjusts the forming milling cutter (10) to the target position.

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