A method for processing weak-rigid closed space products and a milling tool

Abstract

The present application belongs to the technical field of wing assembly, and relates to a processing method and a milling tool for a weak-rigidity closed-space product. The tool has been applied to actual production, and the use effect is good after verification. The tool solves the auxiliary support positioning of the closed area inside the product completed by external operation, can realize fast and accurate auxiliary support, effectively reduces the on-site adjustment difficulty, reduces the work intensity of worker operation adjustment, is reliable and stable in positioning during use, and finally ensures the final precision of the processed product. The technical method can effectively solve the auxiliary support problem of the closed space, provides a new use method for the check pin, and effectively improves the product processing quality, clamping and processing efficiency.

Description

Technical Field

[0001] This invention belongs to the field of wing assembly technology and relates to a processing method and milling fixture for products with weak rigidity and enclosed space. Background Technology

[0002] In the field of aerospace product machining, the geometry of aircraft wing connecting components is a closed frame structure. To reduce weight, many windows of varying shapes are opened. The internal structure of the component is I-shaped, with thin walls in the vertical ribs and upper and lower edge strips. This makes them highly susceptible to vibration during machining, resulting in low milling efficiency. Apart from the process lugs supporting and positioning the product blank around its perimeter, the middle section is suspended. When cutting the thin vertical ribs and upper and lower edge strips in the middle frame, the product's insufficient rigidity causes machining vibration, even affecting the product's machining quality. Auxiliary support and clamping structures are required in the thin-walled middle section to enhance the overall rigidity of the product. Because there are many lugs around the product for support, positioning, and clamping, corresponding support and positioning structures are required. Adjustable auxiliary support and clamping structures must be arranged in the middle, considering that the positioning and clamping structures around the perimeter will surround the auxiliary support and clamping structures in the middle. In traditional designs, the intermediate auxiliary support and clamping mechanism adjustment points are all located in the middle. Reaching in to make adjustments during operation leads to inconvenience or even prevents proper adjustment. Therefore, the intermediate auxiliary support and clamping mechanism must be redesigned to meet the requirements of ease of use and operation; the installation and use of the calibration block should not affect milling efficiency. Summary of the Invention

[0003] The purpose of this invention is to ensure that the auxiliary support structure and clamping structure in a closed and confined space are convenient, easy to use, safe and reliable in terms of support and clamping operation and adjustment.

[0004] The technical solution of this invention:

[0005] A milling fixture for products with weak rigidity and enclosed space includes a multi-support assembly, a single-support assembly, a clamping seat assembly, a double-support assembly with unequal height, an auxiliary support-clamping functional assembly, a base assembly, and a double-support assembly with unequal height.

[0006] The basic components include a tooling body, eye bolts, straightening pins, and verification pins. The straightening pins slide with the precision holes on the fixture body, and the exposed section protruding from the tooling body abuts against the trapezoidal groove of the machine tool platform to form the straightening reference direction of the machine tool. The verification pins have stepped shafts with precision and coaxiality requirements in both their large and small diameters, which are used to verify the accuracy of the cutting tool before machining.

[0007] Because the clamping part of the auxiliary support-clamping functional component is located outside the support point, after the product is clamped, hands cannot reach into the adjustment support part from any of the four directions. The connecting base is fixed to the clamping body. The upper end of the connecting base has notched holes on both sides for inserting sleeve pressure plates. A fully threaded stud is inserted into the center of the hole in the sleeve pressure plate. The stud has a through hole in the center. The fixing pin is pressed into the connecting base from the center of the top of the connecting base, passing through the through hole in the center of the stud. At this time, the sleeve nuts can be adjusted to press the sleeve pressure plates tightly onto the two end faces of the product. The hinge seat is connected to the tooling body. One side of the main support rod has a fork lug that is hinged to the single lug of the hinge seat through a live hinge. The other end has a left-hand thread. The two ends of the adjusting sleeve have left-hand and right-hand threads respectively. The inner hole in the middle of the sleeve is a through hole larger than the major diameter of the thread. There are three radial holes in the middle of the adjusting sleeve for pressing in pins. One side of the support rod 1 has a right-hand thread, and the other end of the support rod 1 has a fork. Both ends of the auxiliary support rod are made into single lugs. Both ends of the support rod 2 are fork lug structures. One end of the support rod 3 has a single lug, and the other end has a threaded ball head structure with an annular groove. The middle part is a precision shaft structure.

[0008] The connection sequence of the auxiliary support connection structure is as follows: the hinge seat is fixed to the clamp body, the single lug on the hinge seat is connected to the fork on the main support rod through a movable hinge, the left-hand thread on the main support rod is screwed into the left-hand thread on the adjusting sleeve, the right-hand thread on the adjusting sleeve is screwed into the right-hand thread on the support rod 1, the adjusting sleeve serves as the drive input end, the center lines of the main support rod, the adjusting sleeve, and the support rod 1 are coaxial, the fork end of the support rod 1 is inserted into the fork lug of the support rod 2 and the single lug on the auxiliary support rod, and they are connected together through a movable hinge. The auxiliary support rod, support rod 1, and support rod 2 are distributed in a herringbone shape. The single lug of the assist support rod is inserted into the slot at the lower end of the connecting base. A hinge is used to connect the hole on the single lug of the assist support rod to the hole on the connecting base perpendicular to the slot surface to form a fixed hinge. The assist support rod serves as an auxiliary support rod of the mechanism, playing an auxiliary support role. By rotating the adjusting sleeve, the main support rod and support rod 1 move closer or further apart. When the assist support rod rotates, the hinge point between support rod 2 and support rod 3 moves linearly forward and backward in the inner hole of the connecting base, pushing the linear movement of the movable support head, supporting it on the positioning end face of the product or removing it from the positioning end face of the product.

[0009] A machining method for milling fixtures used in products with weak rigidity and enclosed spaces, comprising the following steps:

[0010] Step 1: Adjust the support pin and adjusting sleeve to lower the height of the movable support head below the auxiliary support positioning surface of the product.

[0011] Step 2: Position and clamp the product onto the fixture, straighten the pin and align it with the T-slot of the CNC machine tool bed, establish the relationship between the fixture reference and the machine tool coordinate system along a certain coordinate axis, find the positioning axis used by the fixture to position the product and establish the coordinate origin, fix the fixture on the machine tool work platform, at this time the positioning step surface of each process lug of the product is in contact with the positioning surface of each positioning support of the fixture, use the tightening screw with the head down to tighten the process lug to the positioning surface of the positioning support, insert the verification pin, after verifying that there are no problems with the tool, move the tool out of the verification area.

[0012] Step 3: Adjust the sleeve nut individually to move the sleeve pressure plate until it is pressed against both ends of the lower thin rib of the product. Adjust the adjusting support pin until the movable support head is supported on the positioning surface of the product. Rotate the adjusting sleeve until the end faces of the main support rod and support rod 1 are far apart. At this time, the position of the movable hinge point connecting the main support rod and support rod 1 moves upward and outward, pushing the movable hinge point connecting support rod 2, the auxiliary support rod, and support rod 1 to rotate around the movable hinge link point connecting support rod 2 and support rod 3. At the same time, the movable hinge point connecting support rod 2 and support rod 3 moves upward, pushing support rod 3 upward as a whole until the movable support head is pressed against the positioning surface of the product. The clamping is now complete.

[0013] The beneficial effects of this invention are:

[0014] This tooling has been applied in actual production and has proven to be effective. It solves the problem of auxiliary support and positioning of the internal closed area of ​​the product during external operation, enabling rapid and accurate auxiliary support, effectively reducing the difficulty of on-site adjustment, reducing the workload of workers, and ensuring reliable and stable positioning during use, ultimately ensuring the final accuracy of the processed product.

[0015] This technical method can effectively solve the problem of auxiliary support in enclosed spaces, and at the same time provide a new way to use calibration pins, effectively improving product processing quality, clamping and processing efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the wing connection components;

[0017] Figure 2(a) is a front view of the device of the present invention;

[0018] Figure 2(b) is a top view of the device of the present invention;

[0019] Figure 3(a) is a top view of the multi-support assembly;

[0020] Figure 3(b) is a side view of the multi-support assembly;

[0021] Figure 4(a) is a top view of the positioning support;

[0022] Figure 4(b) is a side view of the positioning support.

[0023] Figure 5(a) is a front view of the auxiliary support-clamping functional component;

[0024] Figure 5(b) is a top view of the auxiliary support-clamping functional component;

[0025] Figure 5(c) is a side view of the auxiliary support-clamping functional component;

[0026] Figure 5(d) is a cross-sectional view of the auxiliary support-clamping functional component;

[0027] Figure 6(a) is a top view of the box-shaped welded component;

[0028] Figure 6(b) is a side view of the welded parts of the box body;

[0029] Figure 7(a) is a top view of the support rod and the movable support head;

[0030] Figure 7(b) is a side view of the support rod and the movable support head;

[0031] Figure 7(c) shows the BB cross-section of the support rod and the movable support head;

[0032] Figure 8(a) is a side view of the basic component;

[0033] Figure 8(b) is a top view of the basic component;

[0034] Figure 9(a) is a front view of the box-shaped welded component;

[0035] Figure 9(b) is a side view of the welded parts of the box.

[0036] In the diagram: 100 - Multi-support assembly; 200 - Single-support assembly; 300 - Clamping seat assembly; 400 - Unequal height double support assembly; 500 - Auxiliary support-clamping function assembly; 600 - Basic assembly; 700 - Unequal height double support assembly; 101 - Housing weldment; 102 - Tensioning screw; 103 - Connecting screw; 104 - Positioning support seat; 301 - Adjusting support pin; 401 - Housing weldment; 402 - Support seat; 501 - Connecting base; 502 - Assistive support rod; 503 - Support rod 1; 504-Support rod 2; 505-Adjusting sleeve; 506-Pin handle; 507-Main support rod; 508-Hinge seat; 509-Connecting screw; 510-Live hinge; 511-Pin; 512-Washer; 513-Slotted screw; 514-Support rod 3; 515-Modible support head; 516-Sleeve pressure plate; 517-Sleeve nut; 518-Fixing pin; 519-Stud; 601-Check pin; 602-Tooling body; 603-Eye bolt; 604-Straightening pin; 701-Box welding part. Detailed Implementation

[0037] Example 1:

[0038] like Figure 1 The product's geometry is defined by the arrangement of process lugs around its perimeter as needed. The lower end face of the lugs is used for positioning, and threaded holes are formed on the lugs. Two special lugs have both threaded holes and locating pin holes to position and clamp the product parts. As shown in Figure 2, the tooling structure used to clamp the product consists of a multi-support assembly 100, a single-support assembly 200, a clamping seat assembly 300, a double-support assembly with unequal heights 400, an auxiliary support-clamping function assembly 500, a base assembly 600, and a double-support assembly with unequal heights 700.

[0039] Figure 2 shows the overall tooling structure. Among them, the multi-support assembly 100 in Figure 3, the single-support assembly 200 in Figure 4, the unequal-height double-support assembly 400 in Figure 6, and the unequal-height double-support assembly 700 in Figure 9 are mainly composed of box-shaped welded parts with unequal height steps and support seats. The clamping seat assembly 300 in Figure 5 is mainly similar in structure to the auxiliary support-clamping function assembly 500 in Figure 7. Its main difference from the auxiliary support-clamping function assembly 500 in Figure 7 is that it is... The basic assembly 600 in Figure 8 mainly consists of tooling body 602, eye bolt 603, straightening pin 604, and verification pin 601. The straightening pin 604 slides with the precision hole on the clamping body 602. The exposed section protruding from the tooling body 602 abuts against the trapezoidal groove of the machine tool platform to form the straightening reference direction of the machine tool. The verification pin 601 has stepped shafts with precision and coaxiality requirements in both its large and small diameters, which are used to verify the accuracy of the tool before processing. Normally, the calibration pin is placed on the calibration block support of the tooling, and the calibration block support is fixed to the edge of the tooling. When processing the exterior of the product, there is a problem of collision with the calibration pin mounting base. By changing the calibration pin hole to the process lug of the product, the above problem can be avoided. At the same time, there is no need to manufacture and adjust the assembly of the calibration pin mounting base, thus reducing production costs.

[0040] As shown in Figure 2, because the clamping part of the auxiliary support-clamping functional component 500 is located outside the support point, after the product is clamped, hands cannot reach into the adjustment support part in any of the four directions. As shown in Figure 7, the connecting base 501 is fixed on the clamping body 602. The upper end of the connecting base 501 has notched holes on both sides for inserting the sleeve pressure plate 516. A fully threaded stud 519 is inserted into the middle of the hole in the sleeve pressure plate 516. The stud 519 has a through hole in the middle. The fixing pin 518 is pressed into the connecting base 501 from the middle of the top of the connecting base 501, passing through the middle through hole of the stud 519. At this time, the sleeve nut 517 can be adjusted to press the sleeve pressure plate 516 onto the two end faces of the product. The hinge seat 508 is connected to the tooling body 602. The main support rod 507 has a fork lug on one side, which is hinged to the single lug of the hinge seat 508 through the live hinge 510. The other end has a left-hand thread. The adjusting sleeve 505 has left-hand and right-hand threads at both ends respectively. The middle inner hole of the sleeve is a through hole larger than the major diameter of the thread. The adjusting sleeve 505 has three radial holes in the middle for pressing in the pin handle 506. The support rod 1503 has a right-hand thread on one side and a fork at the other end. The auxiliary support rod 502 has single lugs at both ends. The support rod 2504 has a fork lug structure at both ends. The support rod 3514 has a single lug at one end and a threaded ball head structure with an annular groove at the other end. The middle part is a precision shaft structure.

[0041] The connection sequence of the auxiliary support connection structure is as follows: the hinge seat 508 is fixed on the clamp body 602; the single lug on the hinge seat is connected to the fork on the main support rod 507 through the movable hinge 510; the left-hand thread on the main support rod 507 is screwed into the left-hand thread on the adjusting sleeve 505; the right-hand thread on the adjusting sleeve 505 is screwed into the right-hand thread on the support rod 1503; the adjusting sleeve 505 serves as the drive input end; the center lines of the main support rod 507, the adjusting sleeve 505, and the support rod 1503 are coaxial; the fork end of the support rod 1503 is inserted into the fork lug of the support rod 2504 and the single lug on the auxiliary support rod 502, and connected together through the movable hinge 510; the auxiliary support rod 502, the support rod 1503, and the support rod 2504 are arranged in a herringbone pattern. The single lug of the assist support rod 502 is inserted into the slot at the lower end of the connecting base 501. A movable hinge 510 is used to connect the hole on the single lug of the assist support rod 502 with the hole on the connecting base 501 perpendicular to the slot surface to form a fixed hinge. The assist support rod 502 serves as an auxiliary support rod of the mechanism, playing an auxiliary support role. By rotating the adjusting sleeve 505, the main support rod 507 and the support rod 1503 move closer or further apart. When the assist support rod 502 rotates, the hinge point between the support rod 2504 and the support rod 3514 is moved linearly forward and backward by the support rod 3514 in the inner hole of the connecting base 501, which drives the linear movement of the movable support head 515, supporting it on the positioning end face of the product or removing it from the positioning end face of the product.

[0042] Example 2:

[0043] Adjust the support pin 301 and the adjusting sleeve 505 to lower the high point of the movable support head 515 below the auxiliary support positioning surface of the product.

[0044] Position and clamp the product onto the fixture, straighten the pin 604 and engage it with the T-slot of the CNC machine tool bed, establish the relationship between the fixture reference and the machine tool coordinate system along a certain coordinate axis, find the positioning axis used by the fixture to position the product and establish the coordinate origin, fix the fixture on the machine tool work platform, at this time the positioning step surface of each process lug of the product is in contact with the positioning surface of each positioning support of the fixture, use the tightening screw 102 with the head down to tighten the process lug to the positioning surface of the positioning support, insert the verification pin, after verifying that there is no problem with the tool, move the tool out of the verification area.

[0045] Adjust the sleeve nut 517 individually to drive the sleeve pressure plate 516 to press against the two end faces of the lower thin rib of the product. Adjust the adjusting support pin 301 until the movable support head 515 supports the positioning surface of the product. Rotate the adjusting sleeve 505 until the end faces of the main support rod 507 and the support rod 1503 are far apart. At this time, the position of the movable hinge point connecting the main support rod 507 and the support rod 1503 moves upward and outward, pushing the movable hinge point shared by the support rod 2504, the auxiliary support rod 502, and the support rod 1503 to rotate around the hinge point of the movable hinge 510 connecting the support rod 2504 and the support rod 3514. At the same time, the movable hinge point connecting the support rod 2504 and the support rod 3514 moves upward, pushing the support rod 3514 upward as a whole until the movable support head 515 is pressed against the positioning surface of the product. The clamping is now complete.

Claims

1. A milling fixture for supporting weakly rigid products in an enclosed space, characterized in that, Including a multi-support assembly (100), a single-support assembly (200), a clamping seat assembly (300), a double-support assembly with unequal height (400), an auxiliary support-clamping function assembly (500), a base assembly (600), and a double-support assembly with unequal height (700). The structure of the clamping part of the auxiliary support-clamping function component (500) is as follows: the connecting base (501) is fixed on the tooling body (602), and the upper end of the connecting base (501) has notched holes on both sides for inserting the sleeve pressure plate (516). A fully threaded stud (519) is inserted in the middle of the hole of the sleeve pressure plate (516). A through hole is made in the middle of the stud (519). The fixing pin (518) is pressed into the connecting base (501) from the middle of the top of the connecting base (501), and passes through the middle through hole of the stud (519). At this time, the sleeve nut (517) can be adjusted to press the sleeve pressure plate (516) on both sides of the product. The auxiliary support-clamping function component (500) has the following structure: the hinge seat (508) is connected to the tooling body (602), the main support rod (507) has a fork ear on one side and is hinged to the single ear piece of the hinge seat (508) through a live hinge (510), and the other end has a left-hand thread. The adjusting sleeve (505) has 3 radial holes in the middle to press in the pin handle (506). The support rod 1 (503) has a right-hand thread on one side and a fork at the other end. The auxiliary support rod (502) has single ear pieces at both ends. The connection sequence of the auxiliary support connection structure is as follows: the hinge seat (508) is fixed on the tooling body (602), the single lug on the hinge seat is connected to the fork on the main support rod (507) through the live hinge (510), the left-hand thread on the main support rod (507) is screwed together with the left-hand thread on the adjusting sleeve (505), the right-hand thread on the adjusting sleeve (505) is screwed together with the right-hand thread on the support rod 1 (503), the adjusting sleeve (505) serves as the drive input end, the center lines of the main support rod (507), the adjusting sleeve (505), and the support rod 1 (503) are coaxial, the fork end of the support rod 1 (503) is inserted into the fork lug of the support rod 2 (504), and the single lug on the auxiliary support rod (502) are connected together through the live hinge (510), the auxiliary support rod (502), the support rod 1 (503), and the support rod 2 (504) is distributed in a herringbone shape; the single ear piece of the auxiliary support rod (502) is inserted into the slot at the lower end of the connecting base (501), and the hole on the single ear piece of the auxiliary support rod (502) is inserted into the hole perpendicular to the slot surface on the connecting base (501) using a movable hinge (510) to form a fixed hinge. The auxiliary support rod (502) serves as an auxiliary support rod of the mechanism and plays an auxiliary support role. When the adjusting sleeve (505) is rotated, the main support rod (507) and support rod 1 (503) are relatively close or relatively far apart. When the auxiliary support rod (502) rotates, the hinge point of support rod 2 (504) and support rod 3 (514) is subjected to force. The support rod 3 (514) moves linearly forward and backward in the inner hole of the connecting base (501), which pushes the linear movement of the movable support head (515) to support on the positioning end face of the product or exit the positioning end face of the product. Weak rigidity products refer to products with insufficient rigidity. Due to the product's weak rigidity, processing vibration occurs, and corresponding support is required in the middle of the product. The clamping part of the auxiliary support-clamping functional component (500) is located outside the support point. After the product is clamped, the hand cannot reach into the adjustment support part from any direction. The auxiliary support-clamping functional component (500) solves the problem of auxiliary support positioning of the closed area inside the product during external operation.

2. A milling fixture for supporting a weakly rigid product in an enclosed space as described in claim 1, characterized in that, The basic component (600) includes a tooling body (602), an eye bolt (603), a straightening pin (604), and a verification pin (601). The straightening pin (604) slides with the precision hole on the tooling body (602), and the exposed section of the tooling body (602) abuts against the trapezoidal groove of the machine tool platform to form the straightening reference direction of the machine tool. The verification pin (601) has stepped shafts with precision and coaxiality requirements in both its large and small diameters, which are used to verify the accuracy of the cutting tool before machining.

3. A milling fixture for supporting a weakly rigid product in an enclosed space as described in claim 1 or 2, characterized in that, The adjusting sleeve (505) has left-hand and right-hand threads at both ends, and the inner hole in the middle of the sleeve is a through hole larger than the major diameter of the thread.

4. A milling fixture for supporting a weakly rigid product in an enclosed space as described in claim 1 or 2, characterized in that, Both ends of the support rod 2 (504) are fork lug structures.

5. A milling fixture for supporting a weakly rigid product in an enclosed space as described in claim 3, characterized in that, Both ends of the support rod 2 (504) are fork lug structures.

6. A milling fixture for supporting a weakly rigid product in an enclosed space as described in claim 1, 2, or 5, characterized in that, The support rod 3 (514) has a single lug at one end and a threaded ball head structure with an annular groove at the other end, with the middle part being a precision shaft structure.

7. A milling fixture for supporting a weakly rigid product in an enclosed space as described in claim 3, wherein the support rod 3 (514) has a single lug at one end and a threaded ball head structure with an annular groove at the other end, and the middle part is a precision shaft structure.

8. A milling fixture for supporting a weakly rigid product in an enclosed space as described in claim 4, characterized in that, The support rod 3 (514) has a single lug at one end and a threaded ball head structure with an annular groove at the other end, with the middle part being a precision shaft structure.

9. A machining method for a milling fixture used to support a weakly rigid product in an enclosed space, as described in any one of claims 1 to 8, characterized in that, The steps are as follows: Step 1: Adjust the movable support head (515) so that its high point is lower than the auxiliary support positioning surface of the product by adjusting the support pin (301) and the adjusting sleeve (505); Step 2: Position the product on the fixture, straighten the pin (604) and make it close to the T-slot of the CNC machine tool bed, establish the relationship between the fixture reference and the coordinate system of the machine tool along a certain coordinate axis, find the positioning axis used by the fixture to position the product and establish the coordinate origin, fix the fixture on the machine tool working platform, at this time the positioning step surface of each process lug of the product is in contact with the positioning surface of each positioning support of the fixture, use the tightening screw (102) with the head down to tighten the process lug to the positioning surface of the positioning support, insert the verification pin, and after verifying that there is no problem with the tool, move the tool out of the verification area; Step 3: Adjust the sleeve nut (517) individually to drive the sleeve pressure plate (516) until it is pressed against the two ends of the lower thin rib of the product. Adjust the adjusting support pin (301) until the movable support head (515) supports the positioning surface of the product. Rotate the adjusting sleeve (505) until the end faces of the main support rod (507) and support rod 1 (503) are far apart. At this time, the position of the movable hinge point connecting the main support rod (507) and support rod 1 (503) moves upward and outward, pushing the support... The movable hinge point connecting the support rod 2 (504) and the auxiliary support rod (502) and support rod 1 (503) rotates around the movable hinge (510) connecting the support rod 2 (504) and support rod 3 (514). At the same time, the movable hinge point connecting the support rod 2 (504) and support rod 3 (514) moves upward, pushing the support rod 3 (514) to move upward as a whole until the movable support head (515) is pressed against the positioning surface of the product, and the clamping is completed.

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