Positioning fixture for machining of drill bit tooth hole

Abstract

The utility model provides a kind of processing positioning fixture for drill bit tooth hole, comprising: mounting seat, the mounting seat is provided with accommodating cavity in;Elastic sleeve, it is sleeved in the accommodating cavity, the elastic sleeve is sleeved on the outside of tail handle of drill bit to be processed, the lower end of the elastic sleeve is provided with first outer taper surface, the outer diameter of the first outer taper surface is reduced from top to bottom, the accommodating cavity is equipped with the first inner taper surface for cooperation with elastic sleeve;Press sleeve, it is set in the upper of the elastic sleeve, the inner diameter of the elastic sleeve is adjusted, for the elastic sleeve is compressed, so that the elastic sleeve is clamped to the tail handle;Jacking rod assembly, it is set in the side of the mounting seat, for jacking the powder discharge groove of the drill bit to be processed.Compared with prior art, the processing positioning fixture for drill bit tooth hole provided by the utility model can accurately position the drill bit, and avoid repeated tool setting.

Description

Technical Field

[0001] This utility model relates to the field of positioning fixtures, and in particular to a positioning fixture for machining drill bit teeth. Background Technology

[0002] In the machining process of drill bit teeth, due to the influence of its product structure design characteristics, the spatial position parameters (such as radial distribution radius and axial depth) and angle parameters (such as circumferential deflection angle and hole axis tilt angle) of different drill teeth on the same drill bit are all individualized. That is, each drill tooth has a unique machining coordinate and there are no uniform standard parameters.

[0003] Currently, the industry primarily uses machining centers to perform drill bit machining operations. However, the operation of machining centers relies on pre-written and fixed machining programs, which only match and set the coordinates of drill bits for a single drill bit specification. When the machining requirement changes to a second or more drill bit specifications, due to the lack of a dedicated positioning structure, the drill bit cannot be accurately fixed at a unified reference position that matches the machining center program. As a result, the machining center cannot directly identify and align the drill bit to be machined.

[0004] To ensure machining accuracy, operators must perform a tool resetting process after each change in product specifications: manually adjusting the relative position of the machining center spindle and the workpiece, and using specialized measuring tools to calibrate the actual machining coordinates of each tooth hole of the new specification drill bit until the coordinates match the program parameters. This tool setting process is not only time-consuming, but its accuracy is also highly dependent on the operator's experience, and human error can easily lead to out-of-tolerance machining dimensions for the tooth holes. At the same time, frequent tool resetting directly interrupts the continuous operation of the machining center, significantly reducing equipment utilization and overall production efficiency, making it difficult to meet the needs of alternating multi-specification drill bit production and large-scale production. This has become a core technical problem restricting capacity improvement and machining stability.

[0005] Therefore, there is an urgent need for a positioning fixture for drilling bit hole machining that can accurately position drill bits of various specifications and avoid repeated tool setting. Utility Model Content

[0006] This invention addresses the technical problem of frequent tool setting during the machining of various drill bit holes of different specifications. It provides a positioning fixture for drilling drill bit holes, capable of accurately positioning various drill bits and avoiding repeated tool setting.

[0007] A positioning fixture for machining drill bit teeth includes: Mounting base, wherein a receiving cavity is provided inside the mounting base; An elastic sleeve is fitted inside the accommodating cavity. The elastic sleeve is fitted on the outside of the tail shank of the drill bit to be processed. The lower end of the elastic sleeve is provided with a first outer conical surface. The outer diameter of the first outer conical surface decreases from top to bottom. The accommodating cavity is provided with a first inner conical surface that cooperates with the elastic sleeve. A pressure sleeve is disposed above the elastic sleeve and is used to press the elastic sleeve and adjust the inner diameter of the elastic sleeve so that the elastic sleeve clamps the tail shank. A push rod assembly is disposed on one side of the mounting base and is used to press against the powder discharge groove of the drill bit to be processed.

[0008] Preferably, the upper end of the elastic sleeve is provided with a second outer conical surface, the outer diameter of the second outer conical surface gradually increases from top to bottom, and the pressure sleeve is provided with a second inner conical surface that cooperates with the second outer conical surface.

[0009] Preferably, the outer surface of the upper end of the mounting base is provided with an external thread, and the pressure sleeve is provided with an internal thread that cooperates with the external thread. The internal thread is located below the second inner conical surface, and the pressure sleeve and the mounting base are connected by a threaded drive.

[0010] Preferably, it further includes: A torque drive component used to rotate the pressure sleeve.

[0011] Preferably, the top of the pressure sleeve has a hexagonal structure, and the torque drive component is a wrench.

[0012] Preferably, the elastic sleeve comprises: ontology; A plurality of first opening slots are arranged at circumferential intervals around the body, and the openings of the first opening slots are located on the top of the body; A plurality of second opening slots are arranged at intervals around the circumference of the main body, and the openings of the second opening slots are located at the bottom of the main body. The first opening slots and the second opening slots are arranged alternately at intervals.

[0013] Preferably, the push rod assembly includes: The bracket is fixedly connected to the side of the mounting base; A mounting sleeve is provided on the bracket, and an elastic element is provided inside the mounting sleeve; A push rod is slidably disposed at one end of the mounting sleeve, and one end of the push rod abuts against the elastic element; A top cover is disposed at the end of the mounting sleeve away from the top rod. Rotating the top cover is used to adjust the preload of the elastic element.

[0014] Preferably, the push rod assembly further includes: The mounting hole provided on the bracket is used for sliding connection with the mounting sleeve; A tightening screw is provided on the bracket, and the tightening screw is used to fix the mounting sleeve and the bracket.

[0015] Preferably, the end of the push rod away from the elastic element is specifically spherical.

[0016] Preferably, the mounting base is a cylindrical structure, and a lightweight hole is provided at the bottom of the mounting base. The lightweight hole is coaxially arranged with the receiving cavity, and the inner diameter of the lightweight hole is smaller than the outer diameter of the tailstock.

[0017] Compared with the prior art, the positioning fixture for machining drill bit teeth provided by this utility model includes a mounting base, an elastic sleeve, and a pressure sleeve. The mounting base has a receiving cavity for accommodating the tail shank of the drill bit to be machined. The elastic sleeve is fitted inside the receiving cavity and on the outside of the tail shank of the drill bit to be machined, for clamping and fixing the tail shank. The lower end of the elastic sleeve has a first outer conical surface, which tapers from top to bottom. The receiving cavity has a first inner conical surface, which cooperates with the first outer conical surface to adjust the inner diameter of the elastic sleeve to fit tail shanks of different sizes of drill bits to be machined. The pressure sleeve is positioned above the sleeve and is used to press the elastic sleeve, so that the elastic sleeve clamps the tail shank in the center. Furthermore, a push rod assembly is provided, positioned on one side of the mounting base. The push rod assembly is used to press against the powder discharge groove of the drill bit to be machined, utilizing the machining accuracy of the powder discharge groove to ensure the correct initial positioning direction of the drill bit.

[0018] In use, first place the tail shank of the drill bit to be processed coaxially in the receiving cavity, adjust the posture of the drill bit to be processed, align the powder discharge groove with the push rod, and use the processing accuracy of the powder discharge groove to ensure the initial positioning direction of the drill bit to be processed is accurate. Then, the elastic sleeve is pressed by the pressure sleeve. The first outer conical surface of the elastic sleeve and the first inner conical surface of the receiving cavity cooperate to make the elastic sleeve shrink and deform under radial pressure. The tail shank of the drill bit to be processed is clamped by the inner wall of the elastic sleeve, and the drill bit is firmly clamped in the positioning position. Finally, the "positioning-clamping" is integrated to ensure that there is no displacement deviation of the drill bit during the processing. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1A schematic diagram of a positioning fixture for machining drill teeth provided in an embodiment of this utility model; Figure 2 A top view of a positioning fixture for machining drill teeth provided in an embodiment of this utility model; Figure 3 for Figure 2 A sectional view of AA; Figure 4 This is a schematic diagram of a structure of an elastic sleeve provided in an embodiment of the present utility model.

[0021] Reference numerals: 1. Mounting base; 2. Elastic sleeve; 3. Drill bit to be processed; 4. Pressure sleeve; 5. Push rod assembly; 6. Torque drive component; 11. Receiving cavity; 12. Lightweight hole; 21. Body; 22. First opening slot; 23. Second opening slot; 24. First outer conical surface; 25. Second outer conical surface; 51. Bracket; 52. Mounting sleeve; 53. Elastic component; 54. Push rod; 55. Top cover; 56. Tightening screw. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0024] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0025] like Figures 1 to 4As shown, this utility model provides a positioning fixture for machining drill bit teeth, including: a mounting base 1, with a receiving cavity 11 inside the mounting base 1; an elastic sleeve 2, fitted inside the receiving cavity 11, the elastic sleeve 2 being fitted onto the outer side of the tailstock of the drill bit 3 to be machined, the lower end of the elastic sleeve 2 being provided with a first outer conical surface 24, the outer diameter of the first outer conical surface 24 decreasing from top to bottom, and a first inner conical surface in the receiving cavity 11 that cooperates with the elastic sleeve 2; a pressure sleeve 4, positioned above the elastic sleeve 2, used to press the elastic sleeve 2, and adjust the inner diameter of the elastic sleeve 2 so that the elastic sleeve 2 clamps the tailstock; and a push rod assembly 5, positioned on one side of the mounting base 1, used to press against the powder discharge groove of the drill bit 3 to be machined.

[0026] It should be noted that the powder discharge groove on the side of the drill bit has already been machined before the drill bit teeth are machined.

[0027] Currently, to ensure machining accuracy, operators must perform a tool resetting process after each product specification change: manually adjusting the relative position of the machining center spindle and the workpiece, and using specialized measuring tools to calibrate the actual machining coordinates of each tooth hole of the new specification drill bit until the coordinates match the program parameters. This tool setting process is not only time-consuming, but its accuracy is also highly dependent on the operator's experience, and human error can easily lead to out-of-tolerance machining dimensions for the tooth holes. At the same time, frequent tool resetting directly interrupts the continuous operation of the machining center, significantly reducing equipment utilization and overall production efficiency, making it difficult to meet the needs of alternating multi-specification drill bit production and large-scale production. This has become a core technical problem restricting capacity improvement and machining stability.

[0028] Compared with the prior art, the positioning fixture for machining drill teeth provided by this utility model includes a mounting base 1, an elastic sleeve 2, and a pressure sleeve 4. The mounting base 1 is provided with a receiving cavity 11 for receiving the tail shank of the drill bit 3 to be machined. The elastic sleeve 2 is fitted inside the receiving cavity 11 and is fitted outside the tail shank of the drill bit 3 to be machined for clamping and fixing the tail shank. The lower end of the elastic sleeve 2 is provided with a first outer conical surface 24, and the first outer conical surface tapers from top to bottom. The receiving cavity 11 is provided with a first inner conical surface. The first inner conical surface and the first outer conical surface 24 are used to adjust the inner diameter of the elastic sleeve 2 to adapt to the use of tail shanks of drill bits 3 of different sizes. The pressure sleeve 4 is located above the sleeve and is used to press the elastic sleeve 2 so that the elastic sleeve 2 clamps the tail shank in the center. Secondly, a push rod assembly 5 is also provided. The push rod assembly 5 is located on one side of the mounting base 1. The push rod assembly 5 is used to press the powder discharge groove of the drill bit 3 to be processed, and the processing accuracy of the powder discharge groove is used to ensure that the initial positioning direction of the drill bit is correct.

[0029] In use, the tail shank of the drill bit 3 to be processed is first placed coaxially in the accommodating cavity 11, and the posture of the drill bit 3 to be processed is adjusted. The push rod assembly 5 is used to press the powder discharge groove of the drill bit 3 to be processed. The processing accuracy of the powder discharge groove ensures that the initial positioning direction of the drill bit 3 to be processed is accurate. Then, the elastic sleeve 2 is pressed by the pressure sleeve 4. The first outer conical surface 24 of the elastic sleeve 2 and the first inner conical surface of the accommodating cavity 11 cooperate to make the elastic sleeve 2 shrink and deform under radial pressure. The tail shank of the drill bit 3 to be processed is clamped by the inner wall of the elastic sleeve 2, and the drill bit is firmly clamped in the positioning position. Finally, the "positioning-clamping" integration is achieved to ensure that the drill bit has no displacement deviation during the processing.

[0030] On the one hand, the powder discharge groove of the drill bit 3 to be processed is clamped by the push rod assembly 5, and the machining accuracy of the powder discharge groove ensures the accuracy of the initial positioning direction of the drill bit. The machining accuracy of the previous process can be directly reused (the machining tolerance of the powder discharge groove is usually ≤ ±0.01mm), avoiding the error caused by the secondary datum conversion. On the other hand, the tail shank of the drill bit 3 to be processed is clamped by the elastic sleeve 2, which can be adapted to drill bits of different sizes and has good stability, avoiding the vibration or displacement of the drill bit when the machining center is running at high speed. The overall structure has no complex electrical control components, is resistant to cutting fluid corrosion and mechanical impact, and can adapt to the harsh working conditions of drilling teeth for a long time, thus improving the service life of the tooling.

[0031] In the above structure, during use, external force can be used to press the pressure sleeve 4 downwards, thereby squeezing the elastic sleeve 2 and causing it to contract. Furthermore, as one specific embodiment, the upper end of the elastic sleeve in this utility model embodiment is provided with a second outer conical surface 25, the outer diameter of which gradually increases from top to bottom. The pressure sleeve 4 is provided with a second inner conical surface that cooperates with the second outer conical surface 25. The pressure sleeve 4 and the elastic sleeve 2 also cooperate through a conical surface. While the pressure sleeve 4 is pressing down, it squeezes the elastic sleeve 2 downwards. Since the elastic sleeve 2 and the receiving cavity 11 also cooperate through a conical surface, the elastic sleeve 2 is squeezed, causing it to clamp the drill bit's shank.

[0032] Furthermore, as one embodiment, the upper outer surface of the mounting base 1 in this utility model embodiment is provided with an external thread, and the pressure sleeve 4 is provided with an internal thread that cooperates with the external thread. The internal thread is located below the second inner conical surface, and the pressure sleeve 4 and the mounting base 1 are connected by threads. During use, by rotating the pressure sleeve 4, the pressure sleeve 4 moves axially downward through threaded transmission, continuously squeezing the elastic sleeve 2, causing the elastic sleeve 2 to contract and deform under radial pressure, thereby allowing the inner wall of the elastic sleeve 2 to wrap around the shank of the drill bit, firmly clamping the drill bit in the positioning position.

[0033] Furthermore, for ease of operation, the positioning fixture for machining drill teeth in this embodiment of the present invention also includes a torque drive component 6, which drives the pressure sleeve 4 to rotate. The torque drive component 6 can be fixedly connected to the pressure sleeve 4, or it can be detachably connected to the pressure sleeve 4. The torque drive component 6 can be an existing structure capable of driving the pressure sleeve 4 to rotate.

[0034] Preferably, the torque drive component 6 and the pressure sleeve 4 are detachably connected. As one specific embodiment, the top of the pressure sleeve 4 in this utility model embodiment is a hexagonal connector, and the torque drive component 6 is a wrench.

[0035] like Figure 4 As shown, in one embodiment of the present invention, the elastic sleeve 2 includes: a body 21; a plurality of first opening grooves 22, which are spaced apart around the circumference of the body 21, with the openings of the first opening grooves 22 located at the top of the body 21; and a plurality of second opening grooves 23, which are spaced apart around the circumference of the body 21, with the openings of the second opening grooves 23 located at the bottom of the body 21, and the first opening grooves 22 and the second opening grooves 23 are arranged alternately.

[0036] Specifically, in this embodiment of the present invention, the first opening groove 22 and the second opening groove 23 both extend along the axial direction of the body 21.

[0037] Furthermore, in this embodiment of the present invention, the number of first opening slots 22 is 2 to 6, and the number of second opening slots 23 is specifically 2 to 6.

[0038] More specifically, in this embodiment of the present invention, the first opening groove 22 is provided with 4 grooves, and the second opening groove 23 is provided with 2 grooves.

[0039] Furthermore, as one specific embodiment, the push rod assembly 5 in this utility model includes: a bracket 51, which is fixedly connected to the side of the mounting base 1; a mounting sleeve 52 disposed on the bracket 51, and an elastic element 53 disposed inside the mounting sleeve 52; a push rod 54, which is slidably disposed at one end of the mounting sleeve 52, and one end of the push rod 54 abuts against the elastic element 53; and a top cover 55 disposed at the end of the mounting sleeve 52 away from the push rod 54, and the top cover 55 is used to adjust the preload of the elastic element 53.

[0040] Specifically, during use, the push rod 54 is aligned with the powder discharge groove. The elastic telescopic design of the push rod 54 can adapt to the slight size differences of the powder discharge groove of different specifications of drill bits, eliminating the need to customize special positioning parts for a single specification and expanding the applicability of the tooling.

[0041] In the above structure, as one embodiment, the top rod assembly 5 in this utility model embodiment further includes a mounting hole and a tightening screw 56. The mounting hole is provided on the bracket 51 and is used to slide with the mounting sleeve 52. The tightening screw 56 is provided on the bracket 51 and is used to fix the mounting sleeve 52 and the bracket 51.

[0042] Loosen the tightening screw 56, and the mounting sleeve 52 can slide in the mounting hole, which makes it easier to adjust the position of the push rod. After the push rod is aligned with the powder discharge trough, tighten the tightening screw 56 to fix the mounting sleeve 52 to the bracket 51.

[0043] Furthermore, as one embodiment, the end of the push rod away from the elastic element 53 in this utility model embodiment is specifically a spherical surface. The spherical push pin makes flexible contact with the powder discharge groove, effectively avoiding the impact and scratches caused by rigid positioning to the cutting edge or surface of the powder discharge groove, and reducing the scrap rate of the workpiece.

[0044] Furthermore, as one embodiment, the mounting base 1 in this utility model embodiment is specifically a cylindrical structure. A lightweight hole 12 is provided at the bottom of the mounting base 1. The lightweight hole 12 is coaxially arranged with the mounting base 1, and the inner diameter of the lightweight hole 12 is smaller than the outer diameter of the tail shank. By providing the lightweight hole 12, the weight of the mounting base 1 is reduced, which can further reduce costs.

[0045] The above description is merely an embodiment of this utility model. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of this utility model, but these improvements all fall within the protection scope of this utility model.

Claims

1. A positioning fixture for machining drill bit teeth, characterized in that, include: Mounting base (1), wherein a receiving cavity is provided inside the mounting base (1); An elastic sleeve (2) is fitted inside the accommodating cavity. The elastic sleeve (2) is fitted on the outside of the tail shank of the drill bit (3) to be processed. The lower end of the elastic sleeve (2) is provided with a first outer conical surface. The outer diameter of the first outer conical surface decreases from top to bottom. The accommodating cavity is provided with a first inner conical surface that cooperates with the elastic sleeve. A pressure sleeve (4) is positioned above the elastic sleeve (2) to press the elastic sleeve (2) and adjust the inner diameter of the elastic sleeve (2) so that the elastic sleeve (2) clamps the tail shank. The push rod assembly (5) is disposed on one side of the mounting base (1) and is used to press against the powder discharge groove (31) of the drill bit to be processed.

2. The positioning fixture for machining drill teeth according to claim 1, characterized in that, The upper end of the elastic sleeve (2) is provided with a second outer conical surface, the outer diameter of which gradually increases from top to bottom, and the pressure sleeve (4) is provided with a second inner conical surface that cooperates with the second outer conical surface.

3. The positioning fixture for machining drill teeth according to claim 2, characterized in that, The upper outer surface of the mounting base (1) is provided with an external thread, and the pressure sleeve (4) is provided with an internal thread that works in conjunction with the external thread. The internal thread is located below the second inner conical surface, and the pressure sleeve (4) and the mounting base (1) are connected by a threaded drive.

4. The positioning fixture for machining drill teeth according to claim 3, characterized in that, Also includes: Torque drive (6) for rotating the pressure sleeve (4).

5. The positioning fixture for machining drill teeth according to claim 4, characterized in that, The top of the pressure sleeve (4) is specifically a hexagonal structure, and the torque drive component (6) is specifically a wrench.

6. The positioning fixture for machining drill teeth according to claim 1, characterized in that, The elastic sleeve (2) includes: Ontology(21); A plurality of first opening slots (22) are arranged circumferentially around the body (21), and the openings of the first opening slots (22) are located on the top of the body (21); A plurality of second opening slots (23) are arranged circumferentially around the body (21), the openings of the second opening slots (23) are located at the bottom of the body (21), and the first opening slots (22) and the second opening slots (23) are arranged alternately.

7. The positioning fixture for machining drill teeth according to any one of claims 1 to 6, characterized in that, The push rod assembly (5) includes: The bracket (51) is fixedly connected to the side of the mounting base (1); A mounting sleeve (52) is provided on the bracket (51), and an elastic element (53) is provided inside the mounting sleeve (52); A push rod (54) is slidably disposed at one end of the mounting sleeve (52), and one end of the push rod (54) abuts against the elastic member (53); A top cover (55) is disposed at the end of the mounting sleeve (52) away from the top rod (54). Rotating the top cover (55) is used to adjust the preload of the elastic element (53).

8. The positioning fixture for machining drill teeth according to claim 7, characterized in that, The push rod assembly (5) also includes: The mounting hole provided on the bracket (51) is used for sliding connection with the mounting sleeve (52); A tightening screw (56) is provided on the bracket (51) for fixing the mounting sleeve (52) and the bracket (51).

9. The positioning fixture for machining drill teeth according to claim 7, characterized in that, The end of the top rod (54) away from the elastic element (53) is specifically a spherical surface.

10. The positioning fixture for machining drill teeth according to any one of claims 1 to 6, characterized in that, The mounting base (1) is specifically a cylindrical structure. A lightweight hole (12) is provided at the bottom of the mounting base (1). The lightweight hole (12) is coaxially arranged with the accommodating cavity. The inner diameter of the lightweight hole (12) is smaller than the outer diameter of the tail shank.

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