Small tubular part side wall drilling tool

Abstract

A small tubular part side wall drilling tool, comprising a fixed block, the fixed block is provided with: a fixed hole, the inner wall surface of the fixed hole is matched with the outer wall surface of the part for detachable fixed connection of the part and the fixed block; a plurality of groups of reference surface groups, each group of reference surface groups comprises mutually parallel support surfaces and positioning surfaces, the positioning surfaces are parallel to the axis of the part; positioning holes corresponding in number to the number of the reference surface groups, one end of the positioning hole is located on the positioning surface, the other end of the positioning hole is located on the side wall of the fixed hole, the axis of the positioning hole is perpendicular to the positioning surface, and the positioning hole is used for guiding a drill bit used for drilling; when drilling, the support surfaces in one group of reference surface groups are attached to the reference platform of the drilling machine, the drill bit is positioned and drilled on the side wall of the part under the guidance of the positioning hole, after the support surfaces in another group of reference surface groups are attached to the reference platform, the machining of another hole in a different angular direction is carried out, the clamping of the part and the positioning of the drilling position and the angular direction are solved by using one tool, and the cost and the operation difficulty of the machining equipment are reduced.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, and in particular to a tooling for drilling holes in the sidewalls of small tubular parts. Background Technology

[0002] For small tubular parts, such as fuel nozzles used to uniformly inject fuel, the center of the tubular structure has an axial central hole. Small holes need to be machined on the side wall of the cylindrical tubular structure of the fuel nozzle to connect with the central hole. Usually, a clamping mechanism is used to clamp the tubular structure, and an indexing mechanism is used to adjust the drilling position. Then, small holes at different angular positions are drilled.

[0003] The processing equipment used in the above-mentioned processing process not only needs to be equipped with a clamping mechanism, but also an indexing mechanism, which is costly and complicated to operate. Utility Model Content

[0004] In response to the shortcomings of the existing production technology, the applicant provides a tooling for drilling holes in the side walls of small tubular parts. This tooling solves the problems of clamping the parts, positioning the drilling location and angular orientation, and reduces the cost and difficulty of operation of the processing equipment.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A tooling for drilling holes in the sidewall of a small tubular part includes a fixing block, wherein the fixing block is provided with:

[0007] A fixing hole is provided, located in the middle of the fixing block. The inner wall of the fixing hole mates with the outer wall of the part to detachably and securely connect the part and the fixing block.

[0008] Multiple sets of reference surfaces, each set of reference surfaces includes a support surface and a positioning surface that are parallel to each other. The support surface and the positioning surface are respectively located on the radial sides of the fixing hole, and the positioning surface is parallel to the axis of the part.

[0009] The number of positioning holes corresponds to the number of reference surface groups. One end of the positioning hole is located on the positioning surface, and the other end of the positioning hole is located on the side wall of the fixing hole. The axis of the positioning hole is perpendicular to the positioning surface. The positioning hole is used to guide the drill bit used for drilling.

[0010] During drilling, the supporting surface of one set of reference surfaces is aligned with the reference platform of the drilling machine, so that the drill bit is aligned with the positioning hole. Under the guidance of the positioning hole, the drill bit is positioned and drilled on the side wall of the part. After the supporting surface of another set of reference surfaces is aligned with the reference platform, another hole with a different angle is processed.

[0011] As a further improvement to the above technical solution:

[0012] The fixing hole includes an insertion hole located on the fixing block and a limiting hole that passes through the fixing block at one end. The other end of the limiting hole is connected to one end of the insertion hole, and the diameter of the limiting hole is larger than the diameter of the insertion hole.

[0013] The part includes a machining part and a connecting part arranged along the axial direction of the part. Both the machining part and the connecting part are tubular structures, and the axial directions of the machining part and the connecting part are consistent and their inner holes are connected.

[0014] When the fixing block is detachably fixed to the part, the outer wall surface of the processing part is in contact with the inner wall surface of the insertion hole, the connecting part is located in the limiting hole, the connecting part contacts the bottom of the limiting hole and is detachably fixed to the limiting hole, and the positioning hole is used to guide the drill bit to drill a hole in the side wall of the processing part.

[0015] The inner wall of the limiting hole is provided with a first threaded surface, the outer peripheral surface of the connecting part is provided with a second threaded surface, and the end face of the connecting part is provided with a tool interface. The tool interface is used to connect a tightening tool, and the tightening tool is used to rotate the connecting part to connect the first threaded surface and the second threaded surface, thereby detachably and fixedly connecting the fixing block and the part.

[0016] The tool interface is a straight groove.

[0017] The circumferential sidewall of the limiting hole is provided with a first plane, and the connecting part is provided with a second plane corresponding to the first plane;

[0018] When the fixing block is detachably fixed to the part, the first plane and the second plane are in contact, which is used to restrict the relative rotation of the connecting part and the limiting hole.

[0019] The insertion hole is a through hole, and the end of the processing part is located inside the insertion hole.

[0020] A wear-resistant sleeve of the same length as the positioning hole is installed inside the positioning hole, and the wear-resistant sleeve is used to guide the drill bit.

[0021] The wear-resistant sleeve is a tungsten steel sleeve.

[0022] The supporting surfaces and positioning surfaces in multiple sets of reference surfaces are alternately connected to form a ring structure. The cross section of the ring structure perpendicular to the center line of the ring structure is an N-sided polygon, where N is an even number.

[0023] When N is greater than or equal to six, the N-gon is a regular N-gon.

[0024] The beneficial effects of this utility model are as follows:

[0025] This utility model has a compact and reasonable structure and is easy to operate. By setting fixing holes for fixing parts in the fixing block, and setting multiple sets of mutually parallel support surfaces and positioning surfaces on the outer periphery of the fixing block, the fixing block is provided with positioning holes that are perpendicular to the positioning surfaces and pass through the positioning surfaces and fixing holes. The center line direction of the positioning holes is restricted by the support surfaces supported by the reference platform of the drilling machine, and the positioning drill bit is guided by the positioning holes. The drilling position on the part is positioned and the angular direction of the drilling relative to the axis of the part is determined at the same time. Thus, a single tooling is used to solve the clamping of the part and the positioning of the drilling position and angular direction, reducing the cost of processing equipment and the difficulty of operation.

[0026] This utility model also has the following advantages:

[0027] (1) The fixing hole on the fixing block is divided into two parts along the axial direction. One part is a detachable fixing connection between the limiting hole and the part, which is used to ensure the axial position of the part relative to the fixing block and prevent relative rotation, so as to achieve fixed clamping. The other part is an insertion hole, the inner wall surface of which is in contact with the outer wall surface of the part's machining part, so that the fixing block provides uniform support and fixation for the machining part that needs to be drilled, thereby achieving fixed clamping of the part while avoiding deformation of the hole wall of the tubular structure during the machining process.

[0028] (2) By setting a second plane on the connecting part and a first plane in the limiting hole, the relative position of the part and the machining hole is determined by the surface contact between the second plane and the first plane in the limiting hole.

[0029] (3) The insertion hole is set as a through hole to facilitate the separation of the part from the fixing block. A rod-shaped structure is used to apply a pushing force to the end of the machining part at the end of the through hole, so that the part slides out of the limiting hole, which is convenient for operation.

[0030] (4) Wear-resistant sleeves made of wear-resistant material are used in local positions of the positioning holes to reduce the manufacturing cost of the tooling. Attached Figure Description

[0031] Figure 1 This is a schematic diagram (axiomatic sectional view) of the tooling according to an embodiment of the present invention.

[0032] Figure 2 This is a cross-sectional view of a tooling according to an embodiment of the present invention.

[0033] Figure 3 for Figure 2 A sectional view of section AA in the middle.

[0034] Figure 4 This is a schematic diagram of the tooling structure (with parts) according to an embodiment of the present invention.

[0035] Figure 5 for Figure 4 Axonometric sectional view of the tooling.

[0036] Figure 6 This is a schematic diagram of the structure of a part in one embodiment of the present invention.

[0037] Figure 7 This is a schematic diagram of the tooling structure (with parts) according to another embodiment of the present invention.

[0038] Figure 8 This is a structural schematic diagram of a tooling according to another embodiment of the present invention (exploded view of the tooling and parts).

[0039] Figure 9 This is a cross-sectional view of a tooling (with parts) according to another embodiment of the present invention.

[0040] in:

[0041] 1. Fixed block;

[0042] 2. Reference surface group; 21. Support surface; 22. Positioning surface;

[0043] 3. Positioning holes; 31. Wear-resistant sleeve;

[0044] 4. Fixing hole; 41. Limiting hole; 411. First plane; 42. Insertion hole;

[0045] 5. Part; 51. Connecting part; 511. Tool interface; 512. Second plane; 52. Machining part. Detailed Implementation

[0046] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0047] Example 1:

[0048] like Figures 1-7 As shown, the small tubular part sidewall drilling fixture of this embodiment includes a fixing block 1, which is provided with fixing holes 4, multiple sets of reference surfaces 2 and positioning holes 3.

[0049] The fixing hole 4 is located in the middle of the fixing block 1. The inner wall surface of the fixing hole 4 mates with the outer wall surface of the part 5 to detachably fix the part 5 and the fixing block 1.

[0050] Each set of reference surfaces 2 includes a support surface 21 and a positioning surface 22 that are parallel to each other. The support surface 21 and the positioning surface 22 are located on the radial sides of the fixing hole 4, and the positioning surface 22 is parallel to the axis of the part 5.

[0051] The number of positioning holes 3 corresponds to the number of reference surface group 2. One end of the positioning hole 3 is located on the positioning surface 22, and the other end of the positioning hole 3 is located on the side wall of the fixing hole 4. The axis of the positioning hole 3 is perpendicular to the positioning surface 22. The positioning hole 3 is used to guide the drill bit used for drilling.

[0052] During drilling, the support surface 21 in one set of reference surface group 2 is attached to the reference platform of the drilling machine, so that the drill bit is aligned with the positioning hole 3. Under the guidance of the positioning hole 3, the drill bit is positioned and drilled on the side wall of the part 5. After the support surface 21 in another set of reference surface group 2 is attached to the reference platform, another hole with a different angle is processed.

[0053] Specifically, the angular arrangement of holes on part 5, and the number of holes at the same angular position, vary depending on the specific function of part 5. Figure 6 As shown, the number of holes at the same angular position is one, such as... Figure 9 As shown, there are four holes at the same angular position, such as... Figure 3 and Figure 7 As shown, the circumferential positions of two adjacent sets of reference surfaces 2 relative to the center line of the fixed hole 4 are different due to the different angular positions of the holes to be machined.

[0054] like Figure 7 As shown, the included angle between two adjacent positioning surfaces 22 is α, and the included angle between the center lines of the corresponding positioning holes 3 is β, where α + β = 180 degrees.

[0055] The tooling used in this embodiment is as follows:

[0056] Part 5 is detachably and securely installed in the fixing hole 4;

[0057] Place one support surface 21 of the fixing block 1 against the reference surface of the drilling machine, so that the fixing block 1 is placed on the worktable of the drilling machine;

[0058] Hold the fixing block 1 and rotate the drill bit toward the end of the positioning hole 3 on the positioning surface 22;

[0059] Start the drilling machine and insert the drill bit into the positioning hole 3 to drill the part 5;

[0060] After the hole in one corner is machined, the drill bit is moved out of the positioning hole 3, and the fixing block 1 is rotated so that the other support surface 21 is in contact with the reference surface of the drilling machine. The above actions are repeated to machine the hole in the other corner position.

[0061] After all the holes have been machined, external force is used to remove part 5 from the fixing hole 4.

[0062] The tooling in this embodiment is easy to operate, flexible, and portable. By setting a fixing hole 4 for fixing part 5 in the fixing block 1, and setting multiple sets of mutually parallel support surfaces 21 and positioning surfaces 22 on the outer peripheral surface of the fixing block 1, a positioning hole 3 is set on the fixing block 1 that is perpendicular to the positioning surface 22 and passes through the positioning surface 22 and the fixing hole 4. The center line direction of the positioning hole 3 is restricted by the support surface 21 supported by the reference platform of the drilling machine. The positioning drill bit is guided by the positioning hole 3, and the drilling position on part 5 is positioned at the same time as the angular direction of the drilling relative to the axis of part 5 is determined. Thus, a single tooling solves the clamping of part 5 and the positioning of the drilling position and angular direction, reducing the cost and operation difficulty of the processing equipment.

[0063] In multiple sets of reference surfaces 2, the supporting surface 21 and the positioning surface 22 are alternately connected to form a ring structure. The cross-section of the ring structure perpendicular to its center line is an N-sided polygon, where N is an even number. When it is necessary to ensure that the drill holes are not uniformly distributed around the axis of part 5, the N-sided polygon can be a parallelogram, such as... Figure 7 As shown.

[0064] When N is greater than or equal to six, the N-gon is a regular N-gon. The holes to be drilled can be evenly distributed around the axis of part 5, such as... Figure 3 As shown.

[0065] Example 2:

[0066] Based on Example 1, such as Figure 2 , Figure 5 , Figure 8 As shown, the fixing hole 4 of the small tubular part sidewall drilling tool in this embodiment includes an insertion hole 42 located on the fixing block 1 and a limiting hole 41 with one end penetrating through the fixing block 1. The other end of the limiting hole 41 is connected to one end of the insertion hole 42. The diameter of the limiting hole 41 is larger than the diameter of the insertion hole 42.

[0067] Part 5 includes a machining part 52 and a connecting part 51 arranged along the axial direction of part 5. Both machining part 52 and connecting part 51 are tubular structures, and the axial directions of machining part 52 and connecting part 51 are consistent and their inner holes are connected.

[0068] When the fixing block 1 and the part 5 are detachably fixedly connected, the outer wall surface of the machining part 52 is in contact with the inner wall surface of the insertion hole 42, the connecting part 51 is located in the limiting hole 41, the connecting part 51 contacts the bottom of the limiting hole 41 and is detachably fixedly connected to the limiting hole 41, and the positioning hole 3 is used to guide the drill bit to drill a hole in the side wall of the machining part 52.

[0069] The fixing hole 4 on the fixing block 1 is divided into two parts along the axial direction. One part is the limiting hole 41, which is detachably fixed to the connection part 51 of the part 5. This is used to ensure the axial position of the part 5 relative to the fixing block 1 and prevent relative rotation, thereby achieving fixed clamping. The other part is the insertion hole 42. The inner wall surface of the insertion hole 42 fits against the outer wall surface of the processing part 52 of the part 5, so that the fixing block 1 provides uniform support and fixation for the processing part 52 that needs to be drilled. This achieves fixed clamping of the part 5 while avoiding deformation of the hole wall of the tubular structure during processing.

[0070] like Figure 6 Part 5 shown is a fuel nozzle. The diameter of the connecting part 51 is 8mm, the diameter of the machining part 52 is less than 8mm, and the diameter of the hole to be drilled is 1.5mm. The tooling applicable to this embodiment is approximately the following specifications for part 5: diameter range of Φ6mm-Φ60mm, hole diameter of Φ1mm-Φ10mm, and overall axial length of part 5 of 5mm-100mm. When the specifications of part 5 change, the structural dimensions of the tooling are adjusted accordingly.

[0071] Specifically, the axial direction of the limiting hole 41 is consistent with that of the insertion hole 42; the insertion hole 42 can be a blind hole, and the diameter of the limiting hole 41 is larger than that of the insertion hole 42 so that the connection between the limiting hole 41 and the insertion hole 42 forms a countersunk hole structure. After the connecting part 51 contacts the bottom of the insertion hole 42, the position of the part 5 on the fixing block 1 along the axial direction of the part 5 is positioned to ensure that the hole positions on the machining part 52 of each part 5 are consistent; the axial direction of the machining part 52 and the connecting part 51 are consistent and the inner holes are connected to form a central hole located at the center of the tubular part 5. The central hole can be a through hole or a blind hole; there are multiple ways to detachably connect the connecting part 51 and the limiting hole 41. This embodiment will be described through two specific implementation methods.

[0072] In one specific implementation, such as Figure 5 As shown, the inner wall of the limiting hole 41 is provided with a first threaded surface, the outer peripheral surface of the connecting part 51 is provided with a second threaded surface, and the end face of the connecting part 51 is provided with a tool interface 511. The tool interface 511 is used to connect a tightening tool. The tightening tool is used to rotate the connecting part 51 to connect the first threaded surface and the second threaded surface, thereby detachably fixing the fixing block 1 and the part 5.

[0073] Specifically, both the connecting part 51 and the processing part 52 are circular tubular structures. When the connecting part 51 is rotated, the outer wall surface of the processing part 52 rotates in contact with the inner wall surface of the insertion hole 42 until the connecting part 51 contacts the bottom of the insertion hole 42.

[0074] When the part 5 is detachably and fixedly installed in the fixing hole 4, a tightening tool is used to screw the connecting part 51 into the limiting hole 41 until it can no longer be screwed in, so that the part 5 is installed in the correct position of the fixing block 1, ensuring the axial position accuracy and circumferential distribution requirements of the final drilled hole; the same method is used to remove the part 5.

[0075] Specifically, the tool interface 511 is a slotted groove, which is easy to process, and a slotted screwdriver can be used to rotate the connecting part 51.

[0076] In another specific implementation, such as Figure 8 As shown, a first plane 411 is provided on the circumferential sidewall of the limiting hole 41, and a second plane 512 corresponding to the first plane 411 is provided on the connecting part 51.

[0077] When the fixing block 1 and the part 5 are detachably fixedly connected, the first plane 411 and the second plane 512 are in contact to limit the relative rotation of the connecting part 51 and the limiting hole 41.

[0078] The contact fit between the first plane 411 and the second plane 512 restricts and determines the angular position of the borehole.

[0079] In addition, when the part 5 is detachably and fixedly installed in the fixing hole 4, the first plane 411 and the second plane 512 are in surface contact and the outer wall of the processing part 52 is in contact with the inner wall of the insertion hole 42, which has a certain frictional force. This can fix the axial position of the part 5 and the fixing block 1. In order to ensure the stability of the fixed connection between the part 5 and the fixing block 1, the connecting part 51 can be pressed tightly with fingers when drilling, so that the connecting part 51 and the bottom of the limiting hole 41 are always in contact. Of course, other clamping structures connected to the fixing block 1 can also be used to replace the fingers to press the connecting part 51 into the limiting hole 41.

[0080] If drilling requires a specific angular angle relative to the axis of part 5, a second plane 512 can be provided on the connecting part 51, and a first plane 411 can be provided inside the limiting hole 41. The relative position of part 5 and the machining hole can be determined by the surface contact between the second plane 512 and the first plane 411 inside the limiting hole 41. Figure 7 The angle between the second plane 512 shown and the axis of one of the drill holes is γ, which determines the angular position of all drill holes relative to part 5.

[0081] Specifically, the insertion hole 42 is a through hole, and the end of the machining part 52 is located inside the insertion hole 42.

[0082] The insertion hole 42 is designed as a through hole to facilitate the separation of part 5 from the fixing block 1. When removing part 5, a rod-shaped structure is used to apply a pushing force to the end of the machining part 52 at the end of the through hole, so that part 5 slides out of the limiting hole 41, which facilitates operation.

[0083] Example 3:

[0084] Based on the above embodiments, such as Figure 2 , Figure 9 As shown, in this embodiment, a wear-resistant sleeve 31 of the same length as the positioning hole 3 is installed in the positioning hole 3 of the small tubular part sidewall drilling tool. The wear-resistant sleeve 31 is used to guide the drill bit.

[0085] Specifically, the fixing block 1 can be made of carbon steel, and wear-resistant sleeves 31 made of wear-resistant material can be used in local positions of the positioning hole 3 to reduce the manufacturing cost of the tooling. The wear-resistant sleeves 31 are commercially available products, and the material of the wear-resistant sleeves 31 can typically be high-carbon chromium bearing steel, carburized steel, or tungsten steel.

[0086] Specifically, the wear-resistant sleeve 31 is made of tungsten steel, ensuring optimal performance. For Φ1.5mm drill bits, the tungsten steel sleeve has a lifespan of up to 3000 holes.

[0087] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A tooling for drilling holes in the sidewalls of small tubular parts, characterized in that: Includes a fixing block (1), wherein the fixing block (1) is provided with: Fixing hole (4), the fixing hole (4) is located in the middle of the fixing block (1), the inner wall surface of the fixing hole (4) cooperates with the outer wall surface of the part (5) to detachably fix the part (5) and the fixing block (1); Multiple sets of reference surfaces (2), each set of reference surfaces (2) includes a support surface (21) and a positioning surface (22) that are parallel to each other. The support surface (21) and the positioning surface (22) are located on the radial sides of the fixing hole (4) respectively. The positioning surface (22) is parallel to the axis of the part (5). The number of positioning holes (3) corresponds to the number of reference surface groups (2). One end of the positioning hole (3) is located on the positioning surface (22), and the other end of the positioning hole (3) is located on the side wall of the fixing hole (4). The axis of the positioning hole (3) is perpendicular to the positioning surface (22). The positioning hole (3) is used to guide the drill bit used for drilling. During drilling, the support surface (21) in a set of reference surfaces (2) is attached to the reference platform of the drilling machine so that the drill bit is aligned with the positioning hole (3). Under the guidance of the positioning hole (3), the drill bit is positioned and drilled on the side wall of the part (5). After the support surface (21) in another set of reference surfaces (2) is attached to the reference platform, another hole with a different angle is processed.

2. The drilling fixture for the sidewalls of small tubular parts as described in claim 1, characterized in that: The fixing hole (4) includes an insertion hole (42) located on the fixing block (1) and a limiting hole (41) with one end penetrating the fixing block (1). The other end of the limiting hole (41) is connected to one end of the insertion hole (42). The diameter of the limiting hole (41) is larger than the diameter of the insertion hole (42). The part (5) includes a machining part (52) and a connecting part (51) arranged along the axial direction of the part (5). Both the machining part (52) and the connecting part (51) are tubular structures. The machining part (52) and the connecting part (51) are aligned in the axial direction and their inner holes are connected. When the fixing block (1) is detachably fixed to the part (5), the outer wall surface of the processing part (52) is in contact with the inner wall surface of the insertion hole (42), the connecting part (51) is located in the limiting hole (41), the connecting part (51) contacts the bottom of the limiting hole (41) and is detachably fixed to the limiting hole (41), and the positioning hole (3) is used to guide the drill bit to drill a hole in the side wall of the processing part (52).

3. The drilling fixture for the sidewalls of small tubular parts as described in claim 2, characterized in that: The inner wall of the limiting hole (41) is provided with a first threaded surface, the outer peripheral surface of the connecting part (51) is provided with a second threaded surface, and the end face of the connecting part (51) is provided with a tool interface (511). The tool interface (511) is used to connect a tightening tool. The tightening tool is used to rotate the connecting part (51) to connect the first threaded surface and the second threaded surface, thereby detachably and fixedly connecting the fixing block (1) and the part (5).

4. The drilling fixture for the sidewalls of small tubular parts as described in claim 3, characterized in that: The tool interface (511) is a straight groove.

5. The drilling fixture for the sidewalls of small tubular parts as described in claim 2, characterized in that: The limiting hole (41) has a first plane (411) on its circumferential sidewall, and the connecting part (51) has a second plane (512) corresponding to the first plane (411). When the fixing block (1) is detachably fixed to the part (5), the first plane (411) and the second plane (512) are in contact to restrict the relative rotation of the connecting part (51) and the limiting hole (41).

6. The drilling fixture for the sidewalls of small tubular parts as described in claim 5, characterized in that: The insertion hole (42) is a through hole, and the end of the processing part (52) is located inside the insertion hole (42).

7. The drilling fixture for the sidewalls of small tubular parts as described in claim 1, characterized in that: A wear-resistant sleeve (31) of the same length as the positioning hole (3) is installed inside the positioning hole (3), and the wear-resistant sleeve (31) is used to guide the drill bit.

8. The drilling fixture for the sidewalls of small tubular parts as described in claim 7, characterized in that: The wear-resistant sleeve (31) is a tungsten steel sleeve.

9. The drilling fixture for the sidewalls of small tubular parts as described in claim 1, characterized in that: The support surface (21) and positioning surface (22) in the multiple sets of reference surfaces (2) are alternately connected to form a ring structure. The cross section of the ring structure perpendicular to the center line of the ring structure is an N-sided polygon, where N is an even number.

10. The tooling for drilling the sidewalls of small tubular parts as described in claim 9, characterized in that: When N is greater than or equal to six, the N-gon is a regular N-gon.

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