A small thread hole processing tool

Abstract

This utility model discloses a small thread hole machining fixture, belonging to the field of machining technology. Specifically, this utility model relates to a small thread hole machining fixture, which includes a guide sleeve, a correction block, a base, and a mating platform. This utility model uses a correction block to assist in the correction of the fixture. By changing the guide sleeve to different sizes and increasing the number of guide sleeves, it is suitable for machining threads of different sizes and quantities. This solves the problems of long manual tapping cycles and inconvenience in machining small thread holes, helping to improve machining efficiency, reduce production costs, and further improve the level of lean production. At the same time, it proposes an example and design concept of a rapid tapping fixture, which has significant application and promotion value.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical processing technology, specifically relating to a tooling for machining small threaded holes. Background Technology

[0002] As the performance requirements of aerospace parts continue to increase, the geometric features of parts are becoming more complex, and the assembly requirements between parts are also gradually increasing. Therefore, the use of threaded structures is more common when designing parts.

[0003] Threaded structures are typically machined using CNC milling or manual tapping. CNC milling offers higher precision but is generally suitable for larger threaded holes with diameters of 10mm or more, resulting in higher processing costs. Manual tapping can machine smaller threaded holes with diameters up to 10mm. However, currently used guide bushings only offer coarse positioning, making accurate calibration difficult. This leads to issues such as low machining accuracy and long auxiliary processing time, which become more pronounced in mass production, posing a significant challenge to lean manufacturing. Utility Model Content

[0004] The purpose of this utility model is:

[0005] To address the issues of long tapping cycles and inconvenience in tapping small threaded holes, this invention provides a small threaded hole machining fixture. It employs a correction block to assist in the correction process. By replacing guide sleeves of different sizes and increasing the number of guide sleeves, it is suitable for machining threads of different sizes and quantities, thus meeting the requirements for multi-hole tapping. This helps improve machining efficiency, reduce production costs, and further enhance lean manufacturing capabilities.

[0006] Technical solution:

[0007] A small threaded hole machining fixture includes: a guide sleeve 1, a straightening block 2, and a base 3; several guide sleeves 1 and straightening blocks 2 are evenly distributed on the reference surface 8 of the base 3, and the guide sleeves 1 and straightening blocks 2 are arranged alternately; the lower part of the base 3 is provided with a part clearance outer circle 15, which mates with the center hole of the part, and the part is in contact with the part contact surface 14 provided at the bottom of the mounting outer circle 13.

[0008] The main body of the guide sleeve 1 is a T-shaped structure, including a guide sleeve mounting outer circle 4, a guide sleeve mating outer circle 5, and a guide sleeve working hole 6 for installation. The guide sleeve mating outer circle 5 is concentric with the guide sleeve mating hole 9 on the base 3 and is an interference fit. The length of the guide sleeve mating outer circle 5 is less than the length of the guide sleeve mating hole 9. The guide sleeve mounting outer circle 4 is set at the upper end of the guide sleeve mating hole 9 for installing the guide sleeve 1. The diameter of the guide sleeve mounting outer circle 4 is greater than the diameter of the guide sleeve mating outer circle 5. The upper end face of the guide sleeve mounting outer circle 4 is provided with a chamfer for easy installation. The lower end face of the guide sleeve mounting outer circle 4 mates with the reference surface 8. The guide sleeve 1 is provided with a working hole 6 for the tap to pass through. The diameter of the guide sleeve working hole 6 is larger than the threaded hole of the part to be processed to prevent the tap from scratching the guide sleeve working hole 6.

[0009] The main body of the correction block 2 is a cuboid structure, including a correction surface 7. The correction surface 7 consists of two opposing planes of the correction block 2 near the adjacent guide sleeve 1. The flatness of the correction surface 7 is at least 0.005, and its perpendicularity to the reference surface 8 is at least 0.005.

[0010] The main body of the base 3 is a T-shaped structure, including an outer mounting circle 13, a reference surface 8 on the upper end face of the outer mounting circle 13, an outer chamfer 12 between the reference surface 8 and the outer mounting circle 13, a plurality of guide sleeve mating holes 9 that mate with the guide sleeve 1 are evenly distributed along the circumference of the outer mounting circle 13, a weight reduction hole 11 is opened at the center of the outer mounting circle 13, and an inner chamfer 10 is provided between the reference surface 8 and the weight reduction hole 11.

[0011] The length of the correction block 2 is L, the diameter of the mounting outer circle 13 is D, the diameter of the weight reduction hole 11 is d, the length of the inner chamfer 10 is l1, the length of the outer chamfer 12 is l2, the length of the correction block L = (Dd) / 2 - l1 - l2, and the length-width-height ratio of the correction block 2 is 6:1:8 to ensure sufficient correction surface.

[0012] The positional tolerance of the guide sleeve mating hole 9 relative to the weight reduction hole 11 and the part contact surface 14 is at least 0.01, ensuring the tapping requirements of the part to be processed.

[0013] The flatness of the mating surface 14 of the part is at least 0.01, which mates with the end face of the part to be processed. The diameter of the outer circle 15 of the part is smaller than the corresponding center hole diameter of the part to be processed, so as to prevent interference between the tooling and the part to be processed.

[0014] The number of correction blocks 2 is 4. The 4 correction blocks 2 are evenly distributed along the circumference of the base 3 and are at 45° with the horizontal center line and vertical center line of the outer circle 15 of the part. The positional relationship between the 4 correction blocks and the circumferential features of the part ensures the positional accuracy of the part during tapping, while ensuring the overall balance of the tooling of this utility model.

[0015] The size and quantity of the guide sleeve are determined according to the actual situation of the parts to be processed.

[0016] Beneficial effects

[0017] (1) This utility model adopts a correction block to assist in the correction tooling. By changing the guide sleeve of different sizes and increasing the number of guide sleeves, it is suitable for thread processing of different sizes and quantities, which solves the problem of long cycle and inconvenience of manual correction and tapping of small thread holes.

[0018] (2) It can meet the needs of rapid processing of multi-hole tapping of parts, and can be used in combination with tapping machine to reduce production costs and further improve the level of lean production;

[0019] (3) It has the advantages of convenient operation, low cost and high efficiency. Attached Figure Description

[0020] Figure 1 This is the main view of this fixture.

[0021] Figure 2 This is a top view of the tooling.

[0022] Figure 3 This is the AA sectional view of this fixture.

[0023] Figure 4 This is a structural diagram of the guide sleeve 1 of this tooling.

[0024] Figure 5 This is a structural diagram of the calibration block 2 of this tooling.

[0025] Figure 6 This is the structural diagram of the base 3 of this tooling.

[0026] Figure 7 This is a schematic diagram of the tooling in use.

[0027] Among them, 1-guide sleeve, 2-correction block, 3-base, 4-guide sleeve mounting outer circle, 5-guide sleeve mating outer circle, 6-guide sleeve working hole, 7-correction surface, 8-datum surface, 9-guide sleeve mating hole, 10-inner chamfer, 11-weight reduction hole, 12-outer chamfer, 13-mounting outer circle, 14-part contact surface, 15-part avoidance outer circle. Detailed implementation method:

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. The described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and specific examples:

[0030] This utility model proposes a small threaded hole machining fixture, including: a guide sleeve 1, a straightening block 2, and a base 3; several guide sleeves 1 and straightening blocks 2 are evenly distributed on the reference surface 8 of the base 3, and the guide sleeves 1 and straightening blocks 2 are arranged alternately; the lower part of the base 3 is provided with a part clearance outer circle 15, which mates with the center hole of the part, and the part is in contact with the part contact surface 14 provided at the bottom of the mounting outer circle 13.

[0031] The main body of the guide sleeve 1 is a T-shaped structure, including a guide sleeve mounting outer circle 4, a guide sleeve mating outer circle 5, and a guide sleeve working hole 6 for installation. The guide sleeve mating outer circle 5 is concentric with the guide sleeve mating hole 9 on the base 3 and is an interference fit. The length of the guide sleeve mating outer circle 5 is less than the length of the guide sleeve mating hole 9. The guide sleeve mounting outer circle 4 is set at the upper end of the guide sleeve mating hole 9 for installing the guide sleeve 1. The diameter of the guide sleeve mounting outer circle 4 is greater than the diameter of the guide sleeve mating outer circle 5. The upper end face of the guide sleeve mounting outer circle 4 is provided with a chamfer for easy installation. The lower end face of the guide sleeve mounting outer circle 4 mates with the reference surface 8. The guide sleeve 1 is provided with a working hole 6 for the tap to pass through. The diameter of the guide sleeve working hole 6 is larger than the threaded hole of the part to be processed to prevent the tap from scratching the guide sleeve working hole 6.

[0032] The main body of the correction block 2 is a cuboid structure, including a correction surface 7. The correction surface 7 consists of two opposing planes of the correction block 2 near the adjacent guide sleeve 1. The flatness of the correction surface 7 is at least 0.005, and its perpendicularity to the reference surface 8 is at least 0.005.

[0033] The main body of the base 3 is a T-shaped structure, including an outer mounting circle 13, a reference surface 8 on the upper end face of the outer mounting circle 13, an outer chamfer 12 between the reference surface 8 and the outer mounting circle 13, a plurality of guide sleeve mating holes 9 that mate with the guide sleeve 1 are evenly distributed along the circumference of the outer mounting circle 13, a weight reduction hole 11 is opened at the center of the outer mounting circle 13, and an inner chamfer 10 is provided between the reference surface 8 and the weight reduction hole 11.

[0034] The length of the correction block 2 is L, the diameter of the mounting outer circle 13 is D, the diameter of the weight reduction hole 11 is d, the length of the inner chamfer 10 is l1, the length of the outer chamfer 12 is l2, the length of the correction block L = (Dd) / 2 - l1 - l2, and the length-width-height ratio of the correction block 2 is 6:1:8 to ensure sufficient correction surface.

[0035] The positional tolerance of the guide sleeve mating hole 9 relative to the weight reduction hole 11 and the part contact surface 14 is at least 0.01, ensuring the tapping requirements of the part to be processed.

[0036] The flatness of the mating surface 14 of the part is at least 0.01, which mates with the end face of the part to be processed. The diameter of the outer circle 15 of the part is smaller than the corresponding center hole diameter of the part to be processed, so as to prevent interference between the tooling and the part to be processed.

[0037] The number of correction blocks 2 is 4. The 4 correction blocks 2 are evenly distributed along the circumference of the base 3 and are at 45° with the horizontal center line and vertical center line of the outer circle 15 of the part. The positional relationship between the 4 correction blocks and the circumferential features of the part ensures the positional accuracy of the part during tapping, while ensuring the overall balance of the tooling of this utility model.

[0038] The size and quantity of the guide sleeve are determined according to the actual situation of the parts to be processed.

[0039] See Figure 7 The method of use is as follows: Fix the part to be processed on the vise of the tapping machine. Select this tooling with the same number of guide bushings according to the number of threaded holes to be processed on the part. Place the part contact surface 14 on the base 3 against the upper surface of the part to be processed, and mate the outer circle 15 of the part with the center hole of the part. Place a standard gauge block on the working platform of the tapping machine and measure the parallelism between the correction surface 7 and the standard gauge block. By adjusting the vise, ensure that the parallelism between the correction surface 7 and the standard gauge block is within 0.01, which can ensure that the perpendicularity between the threaded hole after tapping and the upper surface of the part is within 0.01.

[0040] This utility model has many specific applications. The above description is only a preferred embodiment of this patent and does not limit the implementation method and protection scope of this patent. For those skilled in the art, the solutions obtained by making equivalent substitutions and obvious changes under the premise of the principle of this patent should be included in the protection scope of the patent.

Claims

1. A tooling for machining small threaded holes, characterized in that, include: Guide sleeve (1), correction block (2), base (3); several evenly distributed guide sleeves (1) and correction blocks (2) are provided on the reference surface (8) of the base (3), and the guide sleeves (1) and correction blocks (2) are arranged alternately. The lower part of the base (3) is provided with a part avoidance outer circle (15), which cooperates with the center hole of the part, and the part is in contact with the part contact surface (14) at the bottom of the mounting outer circle (13) of the base (3).

2. The tooling for machining small threaded holes according to claim 1, characterized in that, The guide sleeve (1) is a T-shaped structure, including a guide sleeve mounting outer circle (4), a guide sleeve mating outer circle (5), and a guide sleeve working hole (6) for installation. The guide sleeve mating outer circle (5) is concentric with the guide sleeve mating hole (9) on the base (3) and is an interference fit. The length of the guide sleeve mating outer circle (5) is less than the length of the guide sleeve mating hole (9). The guide sleeve mounting outer circle (4) is set at the upper end of the guide sleeve mating hole (9) for installing the guide sleeve (1). The diameter of the guide sleeve mounting outer circle (4) is greater than the diameter of the guide sleeve mating outer circle (5). The upper end face of the guide sleeve mounting outer circle (4) is chamfered. The lower end face of the guide sleeve mounting outer circle (4) is mated with the reference surface (8). The guide sleeve (1) is provided with a working hole (6) for the tap to pass through. The diameter of the guide sleeve working hole (6) is larger than the thread hole of the part to be processed.

3. The tooling for machining small threaded holes according to claim 1, characterized in that, The main body of the correction block (2) is a cuboid structure, including a correction surface (7); the correction surface (7) is two opposing planes of the correction block (2) near the adjacent guide sleeve (1), the flatness of the correction surface (7) is at least 0.005, and the perpendicularity to the reference surface (8) is at least 0.

005.

4. The tooling for machining small threaded holes according to claim 1, characterized in that, The base (3) is a T-shaped structure. The reference surface (8) is set on the upper end face of the mounting outer circle (13). An outer chamfer (12) is set between the reference surface (8) and the mounting outer circle (13). Several guide sleeve mating holes (9) that mate with the guide sleeve (1) are evenly distributed along the circumference of the mounting outer circle (13). A weight reduction hole (11) is opened at the center of the mounting outer circle (13). An inner chamfer (10) is set between the reference surface (8) and the weight reduction hole (11).

5. The tooling for machining small threaded holes according to claim 4, characterized in that, The length of the correction block (2) is L, the diameter of the outer circle (13) is D, the diameter of the weight reduction hole (11) is d, the length of the inner chamfer (10) is l1, the length of the outer chamfer (12) is l2, the length of the correction block L = (Dd) / 2 - l1 - l2, and the length-width-height ratio of the correction block (2) is 6:1:8 to ensure sufficient correction surface.

6. The small threaded hole machining fixture according to claim 4, characterized in that, The positional tolerance of the guide sleeve mating hole (9) relative to the weight reduction hole (11) and the part mating surface (14) is at least 0.

01.

7. A small threaded hole machining fixture according to claim 6, characterized in that, The flatness of the mating surface (14) of the part is at least 0.01, and it mates with the end face of the part to be processed. The diameter of the outer circle (15) of the part is smaller than the diameter of the corresponding center hole of the part to be processed.

8. The tooling for machining small threaded holes according to claim 1, characterized in that, The number of the correction blocks (2) is 4. The 4 correction blocks (2) are evenly distributed along the circumference of the base (3) and are at 45° with the horizontal center line and vertical center line of the outer circle (15) of the part. The positional accuracy of the part tapping process is ensured by the positional relationship between the 4 correction blocks and the circumferential features of the part.

9. A small threaded hole machining fixture according to claim 1, characterized in that, The size and quantity of the guide sleeve (1) are determined according to the actual situation of the parts to be processed.

Images