Drilling template assembly

Abstract

This invention belongs to the field of machining assembly technology and discloses a drilling template assembly, including a drilling template, a bushing, a drill sleeve, and a locking component. The drilling template is used to press the workpiece and has a through hole thereon; the bushing has a C-shaped ring structure and is located in the through hole, and the central hole of the bushing includes a tapered section; the first end of the drill sleeve is connected to an upstream device, and the second end passes through the tapered section and abuts against the workpiece. The drill sleeve has an mounting cone surface corresponding to the tapered section, and the mounting cone surface abuts against the inner wall of the tapered section; the locking component can lock or unlock the drill sleeve and the bushing. Compared with a drilling template, the drill sleeve reduces the contact area with the workpiece, allowing the drill sleeve to fit more tightly against the workpiece surface. Furthermore, by precision machining the drill sleeve, its height can be controlled, ensuring that the axial distance from the cutting tool on the drilling device to the workpiece surface is determined after the drilling device abuts against the workpiece surface, thus allowing for precise control of the drilling depth. It also has the advantages of simple structure and convenient operation.

Description

Technical Field

[0001] This invention relates to the field of machining assembly technology, and in particular to a drilling template assembly. Background Technology

[0002] Spiral milling is a newly emerging method for machining connecting holes in the aerospace field. Compared with traditional drilling processes, it has advantages such as better machining quality, higher hole-making efficiency, and lower cost, and its application prospects are promising. Portable spiral milling equipment used in conjunction with drilling templates has already begun practical application in domestic aerospace companies.

[0003] By using a specially designed milling and countersinking tool, drilling can be completed simultaneously with hole making using a helical milling method. To ensure that the countersunk rivet or bolt head is flush with the workpiece surface after installation, the drilling depth usually needs to be controlled within a certain range. During the drilling process, the drilling depth is controlled by the axial feed distance of the tool.

[0004] In the existing technology, when the drill template clamps the workpiece, the contact area between the drill template and the workpiece is large. In addition, due to the workpiece's own error and the drilling template's processing error, after docking and locking with the portable spiral milling equipment, there is a large error in the vertical distance from the zero point of the spiral milling equipment's tool to the workpiece surface. Therefore, after the tool feeds to the preset depth, the actual drilling depth will deviate, which seriously affects the hole making accuracy. Summary of the Invention

[0005] The purpose of this invention is to provide a drilling template assembly that can precisely control the drilling depth, eliminate axial errors, and has a simple structure, low cost, and convenient operation.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The drilling template assembly of the present invention includes:

[0008] A drilling template, used to clamp the workpiece, has through holes.

[0009] A bushing, wherein the bushing has a C-shaped annular structure, the bushing is disposed within the through hole, and the central hole of the bushing includes a tapered hole segment;

[0010] A drill bushing, the first end of which is used to connect to upstream equipment, the second end of which passes through the tapered hole section and abuts against the workpiece, the drill bushing having an mounting cone surface corresponding to the tapered hole section, the mounting cone surface abutting against the inner wall of the tapered hole section;

[0011] A locking element that can lock or unlock the drill bushing to the bushing.

[0012] Optionally, the drill bushing includes:

[0013] A positioning sleeve, which abuts against the workpiece;

[0014] A connecting sleeve, one end of which is used to connect to the upstream equipment, and the other end is fixedly connected to the positioning sleeve. The mounting cone surface is located at the end of the connecting sleeve near the positioning sleeve, and the outer diameter of the positioning sleeve is smaller than the outer diameter of the connecting sleeve.

[0015] Optionally, the through hole is a stepped hole, which includes a mounting hole section and a positioning hole section. The bushing is placed in the mounting hole section, and the positioning sleeve is inserted into the positioning hole section.

[0016] Optionally, the connecting sleeve is provided with a clamping flange, the clamping flange is provided with a connecting through hole corresponding to the locking member, the shaft is provided with a connecting threaded hole corresponding to the connecting through hole, and the locking member passes through the corresponding connecting through hole and is threadedly connected to the connecting threaded hole.

[0017] Optionally, the clamping flange is also provided with multiple disassembly threaded holes.

[0018] Optionally, the distance between the clamping flange and the end face of the positioning sleeve is greater than the thickness of the drill template, and the height of the positioning sleeve is greater than the depth of the positioning hole section.

[0019] Optionally, a guide slope is provided at the junction of the mounting hole section and the positioning hole section, and a guide mating slope corresponding to the guide slope is provided on the end face of the positioning sleeve.

[0020] Optionally, one end of the connecting sleeve is provided with a connecting flange for fixed connection with the upstream equipment.

[0021] Optionally, the central hole of the bushing further includes a limiting hole section connected to the small diameter end of the tapered hole section, the inner diameter of the limiting hole section being equal to the inner diameter of the small diameter end of the tapered hole section.

[0022] Optionally, the bottom of the drill template is provided with a clamping protrusion.

[0023] The beneficial effects of this invention are as follows:

[0024] The drilling template assembly provided by this invention reduces the contact area with the workpiece by adding a precision-machined drill sleeve to the drilling template, compared to the original drilling template. This allows the drill sleeve to fit more tightly against the workpiece surface, reducing installation errors. Furthermore, by precision-machined the drill sleeve, its height can be controlled, ensuring that the axial distance between the cutting tool on the drilling equipment and the workpiece surface is determined after the drilling equipment comes into contact with the workpiece surface. This guarantees precise control of the drilling depth, eliminates axial errors, and also has the advantages of simple structure, low cost, and convenient operation. Attached Figure Description

[0025] Figure 1 This is an assembly diagram of the drilling template assembly of the present invention;

[0026] Figure 2 This is a cross-sectional view of the drilling template assembly of the present invention along the AA direction;

[0027] Figure 3 This is a schematic diagram of the bushing structure of the present invention;

[0028] Figure 4 This is a cross-sectional view of the bushing of the present invention along the BB direction;

[0029] Figure 5 This is a schematic diagram of the drilling template structure of the present invention;

[0030] Figure 6 This is a schematic diagram of the drill sleeve structure of the present invention;

[0031] Figure 7 This is an assembly diagram of another drilling template assembly of the present invention;

[0032] Figure 8 This is a cross-sectional view of another drilling template assembly of the present invention along the CC direction;

[0033] Figure 9 This is a schematic diagram of another drill sleeve structure according to the present invention.

[0034] In the picture:

[0035] 100. Workpiece;

[0036] 1. Drill template; 11. Through hole; 111. Mounting hole section; 112. Positioning hole section; 12. Clamping protrusion

[0037] 2. Bushing; 21. Tapered bore section; 22. Limiting bore section; 23. Connecting threaded hole;

[0038] 3. Drill bushing; 31. Mounting conical surface; 32. Positioning sleeve; 33. Connecting sleeve; 331. Connecting flange; 332. Clamping flange; 3321. Connecting through hole; 3322. Disassembly threaded hole; 34. Spiral protrusion; 35. Mounting clearance surface;

[0039] 4. Locking components;

[0040] 5. Tighten the bolts;

[0041] 6. Pressure plate. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0043] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0046] To improve drilling accuracy and eliminate axial errors, this embodiment provides a drilling template assembly.

[0047] like Figure 1-6As shown, the drilling template assembly includes a drilling template 1, a bushing 2, a drill sleeve 3, and a locking element 4. When drilling a workpiece 100 using the drilling template assembly, the drilling template 1 is first pressed against the workpiece 100. A through hole 11 is pre-drilled on the drilling template 1, and the position corresponding to the through hole 11 is the location where a hole needs to be drilled on the workpiece 100. Then, the bushing 2 is placed in the through hole 11. The bushing 2 is a C-shaped ring structure, and a tapered hole section 21 is provided on the center hole of the bushing 2. After placing the bushing 2, the drill sleeve 3 is inserted into the bushing 2. The first end of the drill sleeve 3 is connected to an upstream device; in this embodiment, the upstream device is a spiral milling device. The second end of the drill sleeve 3 passes through the bushing 2 and abuts against the surface of the workpiece 100. The drill sleeve 3 has an mounting cone surface 31 corresponding to the tapered hole section 21 on the bushing 2. When the drill sleeve 3 passes through the bushing 2, the mounting cone surface 31 on the drill sleeve 3 slides along the tapered hole section 21 on the bushing 2 towards the workpiece 100. During the sliding process, the drill... The mounting conical surface 31 on the sleeve 3 and the inner wall of the tapered hole section 21 on the bushing 2 always remain in contact. The cooperation of the two conical surfaces provides a good centering effect for the drill sleeve 3. In order to accurately control the drilling depth and eliminate axial error, the drill sleeve 3 is controlled by precision machining to control the external dimensions of the drill sleeve 3. Then, the drill sleeve 3 and the bushing 2 are locked or unlocked by the locking member 4. Under the action of the locking member 4, the mounting conical surface 31 on the drill sleeve 3 slides along the tapered hole section 21 on the bushing 2 towards the workpiece 100. During the sliding process, the outer wall of the mounting conical surface 31 on the drill sleeve 3 continuously squeezes the inner wall of the tapered hole section 21 on the bushing 2. At this time, the opening on the bushing 2 gradually becomes larger, and the bushing 2 also expands outward. The outer wall of the bushing 2 continuously squeezes the inner wall of the through hole 11 on the drill template 1. Finally, the bushing 2 and the drill template 1 are tightened. At this time, the drill sleeve 3 is connected to the drill template 1 through the bushing 2 to become a whole.

[0048] By adding a precision-machined drill bushing 3 between the workpiece 100 and the spiral milling machine, compared to the spiral milling machine connecting to the workpiece 100 via the drill template 1, the drill bushing 3 has a smaller contact area with the workpiece 100. This allows the drill bushing 3 to fit tightly against the surface of the workpiece 100 even if there are machining errors in the workpiece 100 itself, thereby reducing errors caused during installation. Furthermore, by precision machining the drill bushing 3, the height of the drill bushing 3 can be controlled. Through these two aspects, the axial error between the tool on the spiral milling machine and the surface of the workpiece 100 is eliminated as much as possible, thus ensuring precise control of the drilling depth.

[0049] Furthermore, such as Figure 2-4As shown, the central hole of the bushing 2 also includes a limiting hole section 22 connected to the small diameter end of the tapered hole section 21. The inner diameter of the limiting hole section 22 is equal to the inner diameter of the small diameter end of the tapered hole section 21. By setting the limiting hole section 22 in the central hole of the bushing 2, the distance that the drill sleeve 3 descends when passing through the bushing 2 is limited, so as to avoid unnecessary indentations on the surface of the workpiece 100 caused by the excessive descent of the drill sleeve 3.

[0050] Furthermore, such as Figure 2 , Figure 5 As shown, the bottom of the drill template 1 is provided with a clamping protrusion 12. By providing the clamping protrusion 12 at the bottom of the drill template 1, the contact area between the drill template 1 and the workpiece 100 can be reduced, thereby further reducing the axial error generated during installation.

[0051] Optionally, such as Figure 2 , Figure 5 , Figure 6 As shown, the drill sleeve 3 includes a positioning sleeve 32 and a connecting sleeve 33. The outer diameter of the connecting sleeve 33 is larger than that of the positioning sleeve 32. One end of the connecting sleeve 33 is connected to the upstream equipment, and the other end of the connecting sleeve 33 is fixedly connected to the positioning sleeve 32. A mounting cone surface 31 is provided on the connecting sleeve 33. When the drill sleeve 3 is inserted into the bushing 2, the positioning sleeve 32 passes through the through hole 11 on the drill template 1 and abuts against the surface of the workpiece 100. By using a positioning sleeve 32 with a smaller outer diameter to abut against the surface of the workpiece 100, the contact area between the drill sleeve 3 and the surface of the workpiece 100 can be further reduced, thereby further reducing the installation error between the drill sleeve 3 and the surface of the workpiece 100.

[0052] Optionally, such as Figure 6 As shown, one end of the connecting sleeve 33 is provided with a connecting flange 331, which facilitates the connection of the drill sleeve 3 to the upstream equipment.

[0053] Optionally, such as Figure 2 , Figure 5 , Figure 6 As shown, the through hole 11 on the drill template 1 is a stepped hole, including a mounting section 111 and a positioning section 112. The mounting section 111 is used to place the bushing 2, and the inner diameter of the mounting section 111 is slightly larger than the outer diameter of the bushing 2 when it is not assembled with the drill sleeve 3. The positioning sleeve 32 on the drill sleeve 3 is inserted into the positioning section 112, and the inner diameter of the positioning section 112 is slightly larger than the outer diameter of the positioning sleeve 32. By setting the through hole 11 as a stepped hole, the stepped hole ensures that only the positioning sleeve 32 abuts against the surface of the workpiece 100 while bearing the bushing 2, thus minimizing the contact area with the surface of the workpiece 100 and reducing axial error.

[0054] Optionally, such as Figure 2 , Figure 4 , Figure 6As shown, the connecting sleeve 33 is provided with a clamping flange 332, and the clamping flange 332 has a connecting through hole 3321 corresponding to the locking member 4. The bushing 2 has a connecting threaded hole 23 corresponding to the connecting through hole 3321. The locking member 4 passes through the corresponding connecting through hole 3321 and is threadedly connected to the connecting threaded hole 23, thereby locking or unlocking the drill sleeve 3 and the bushing 2. In this embodiment, the locking member 4 is a countersunk bolt. When it is necessary to lock the drill sleeve 3 and the bushing 2, first rotate the drill sleeve 3 so that the through hole 11 on the clamping flange 332 is aligned with the connecting threaded hole 23 on the bushing 2, and then pass the countersunk bolt through the through hole 11 on the clamping flange 332 and thread it to the connecting threaded hole 23 on the bushing 2. The threaded holes 23 are screwed together. As the countersunk bolt is continuously screwed into the threaded holes 23, the mounting cone surface 31 on the drill sleeve 3 gradually slides towards the workpiece 100 along the tapered hole section 21 on the bushing 2. During the sliding process, the mounting cone surface 31 on the drill sleeve 3 continuously presses against the inner wall of the tapered hole section 21 on the bushing 2. At this time, the opening on the bushing 2 gradually becomes larger, and the bushing 2 also expands outward. The outer wall of the bushing 2 continuously presses against the inner wall of the through hole 11 on the drill template 1. Finally, the bushing 2 and the drill template 1 are tightened. At this time, the drill sleeve 3 is connected to the drill template 1 as a whole through the bushing 2. When it is necessary to unlock, the countersunk bolt is screwed in the opposite direction to unlock the drill sleeve 3 from the bushing 2.

[0055] By using a threaded engagement method, a force can be provided to the drill bushing 3 to move along the workpiece 100 direction, so that the drill bushing 3 can continuously slide along the tapered hole section 21 on the bushing 2 towards the workpiece 100. When the mounting cone surface 31 on the drill bushing 3 continuously presses the tapered hole section 21 on the bushing 2 downward, the tapered hole section 21 will also provide a reverse force to the mounting cone surface 31. The threaded structure can effectively counteract this reverse force.

[0056] Furthermore, the clamping flange 332 is also provided with multiple disassembly threaded holes 3322. When it is necessary to unlock the drill bushing 3 and the bushing 2, the countersunk bolt is turned in the opposite direction. Even after the countersunk bolt is removed, because the bushing 2 expanded during locking, it contracts and tightly clamps the drill bushing 3 after unlocking, which may prevent the bushing 2 and the drill bushing 3 from being separated smoothly. At this time, the countersunk bolt is passed through the disassembly threaded holes 3322 on the connecting flange 331 and abuts against the surface of the bushing 2. As the countersunk bolt is continuously screwed downward, it will push the bushing 2 to move downward until it separates from the drill bushing 3. By providing disassembly threaded holes 3322 on the connecting flange 331, the drill bushing 3 and the bushing 2 can be separated more effectively.

[0057] Optionally, such as Figure 2 , Figure 5 , Figure 6As shown, the distance between the end face of the clamping flange 332 and the positioning sleeve 32 is greater than the thickness of the drill template 1. If the distance between the clamping flange 332 and the positioning sleeve 32 is less than the thickness of the drill template 1, the end face of the positioning sleeve 32 will not be able to abut against the surface of the workpiece 100 when the clamping flange 332 contacts the upper surface of the drill template 1. Furthermore, the height of the positioning sleeve 32 also needs to be greater than the depth of the positioning hole section 112. By limiting the above dimensions, it is ensured that the drill sleeve 3 can smoothly abut against the surface of the workpiece 100 after passing through the drill template 1.

[0058] Optionally, by providing a guide slope at the junction of the mounting hole section 111 and the positioning hole section 112, and providing a guide mating slope corresponding to the guide slope on the end face of the positioning sleeve 32, when the positioning sleeve 32 passes through the junction of the mounting hole section 111 and the positioning hole section 112, the positioning sleeve 32 can enter the positioning hole section 112 more smoothly under the action of the guide slope and the guide mating slope, and at the same time, it can also prevent the positioning sleeve 32 and the positioning hole section 112 from colliding and causing damage.

[0059] This embodiment also provides a drilling template assembly, such as Figure 7-9As shown, the drilling template assembly includes a drill sleeve 3 and a drilling template 1. The drilling template 1 is used to clamp the workpiece 100. The drilling template 1 also has through holes 11, which are used to determine the drilling positions on the workpiece 100. Several clamping bolts 5 are pre-tightened on the drilling template 1. In other embodiments, clamping plates 6 can be used instead of clamping bolts 5, or a combination of clamping bolts 5 and clamping plates 6 can be used. Both clamping bolts 5 and clamping plates 6 are provided with clamping protrusions 12. When clamping bolts 5 and / or clamping plates 6 are pre-connected to the drilling template 1, there is an installation gap between the clamping protrusions 12 on the clamping bolts 5 and clamping plates 6 and the upper surface of the drilling template 1. The drill sleeve 3 includes a connecting sleeve 33 and a positioning sleeve 32. One end of the connecting sleeve 33 is provided with a connecting flange 331 for connecting to upstream equipment. In this embodiment, the upstream equipment is a spiral milling machine. The other end of the connecting sleeve 33 is fixedly connected to the positioning sleeve 32. The positioning sleeve 32 is provided with a spiral protrusion 34 and at least one mounting clearance surface 35. The positioning sleeve 32 avoids the clamping bolt 5 and / or clamping plate 6 when inserted through the mounting clearance surface 35. The drill sleeve 3 is inserted into the through hole 11 of the drill template 1 and comes into contact with the surface of the workpiece 100. At this time, by rotating the drill sleeve 3, the spiral protrusion 34 on the positioning sleeve 32 is screwed into the installation gap between the pressing protrusion 12 and the upper surface of the drill template 1, so that the lower surface of the pressing protrusion 12 comes into contact with the upper surface of the spiral protrusion 34. As the drill sleeve 3 is continuously screwed, under the action of the spiral protrusion 34, the positioning sleeve 32 moves towards the workpiece 100, so that the positioning sleeve 32 and the surface of the workpiece 100 fit more tightly. Compared to the existing technology where the drill template 1 has a large contact area with the surface of the workpiece 100, the drilling template 1 cannot fit tightly with the surface of the workpiece 100 due to the machining errors of the drill template 1 and the workpiece 100 itself, resulting in axial errors during drilling. However, when the positioning sleeve 32 is used to abut against the surface of the workpiece 100, there is a smaller contact area, which eliminates the installation errors caused by the machining problems of the workpiece 100 itself. This allows the distance between the tool on the spiral milling equipment and the surface of the workpiece 100 to be determined, thus minimizing axial errors.

[0060] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A drilling template assembly, characterized in that, The drilling template assembly includes: A drilling template (1) is used to press the workpiece (100), and a through hole (11) is provided on the drilling template (1); The bushing (2) has a C-shaped ring structure and is disposed in the through hole (11). The central hole of the bushing (2) includes a tapered hole section (21). A drill sleeve (3) is provided. The first end of the drill sleeve (3) is used to connect with the upstream equipment. The second end of the drill sleeve (3) passes through the tapered hole section (21) and abuts against the workpiece (100). The drill sleeve (3) is provided with an mounting cone surface (31) corresponding to the tapered hole section (21). The mounting cone surface (31) abuts against the inner wall of the tapered hole section (21). Locking element (4), which can lock or unlock the drill bushing (3) and the bushing (2); The drill sleeve (3) includes: Positioning sleeve (32) abuts against the workpiece (100); A connecting sleeve (33) is provided, one end of which is used to connect to the upstream equipment, and the other end is fixedly connected to the positioning sleeve (32). The mounting cone surface (31) is provided on the connecting sleeve (33), and the outer diameter of the positioning sleeve (32) is smaller than the outer diameter of the connecting sleeve (33).

2. The drilling template assembly according to claim 1, characterized in that, The through hole (11) is a stepped hole, which includes a mounting hole section (111) and a positioning hole section (112). The bushing (2) is placed in the mounting hole section (111), and the positioning sleeve (32) is inserted into the positioning hole section (112).

3. The drilling template assembly according to claim 2, characterized in that, The connecting sleeve (33) is provided with a clamping flange (332), the clamping flange (332) is provided with a connecting through hole (3321) corresponding to the locking member (4), the bushing (2) is provided with a connecting threaded hole (23) corresponding to the connecting through hole (3321), and the locking member (4) passes through the corresponding connecting through hole (3321) and is threadedly connected to the connecting threaded hole (23).

4. The drilling template assembly according to claim 3, characterized in that, The clamping flange (332) is also provided with multiple disassembly threaded holes (3322).

5. The drilling template assembly according to claim 3, characterized in that, The distance between the end face of the clamping flange (332) and the positioning sleeve (32) is greater than the thickness of the drilling template (1), and the height of the positioning sleeve (32) is greater than the depth of the positioning hole section (112).

6. The drilling template assembly according to claim 2, characterized in that, A guide slope is provided at the junction of the mounting hole section (111) and the positioning hole section (112), and a guide mating slope corresponding to the guide slope is provided on the end face of the positioning sleeve (32).

7. The drilling template assembly according to claim 1, characterized in that, One end of the connecting sleeve (33) is provided with a connecting flange (331) for fixed connection with the upstream equipment.

8. The drilling template assembly according to claim 1, characterized in that, The central hole of the bushing (2) also includes a limiting hole section (22) connected to the small diameter end of the tapered hole section (21), the inner diameter of the limiting hole section (22) being equal to the inner diameter of the small diameter end of the tapered hole section (21).

9. The drilling template assembly according to claim 1, characterized in that, The bottom of the drill template (1) is provided with a pressing protrusion (12).

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