A positive negative chamfer PCD reamer

Abstract

This utility model discloses a PCD reamer with positive and negative chamfering technology. A connecting rod is installed at the lower end of the tool holder. An upper tool post, a middle tool post, and a lower tool post are sequentially installed on the connecting rod. Multiple threaded holes are provided in the middle of the connecting rod for positioning the middle tool post. Bolts threaded into the threaded holes are installed in the middle of the middle tool post. Connecting plates are installed at the upper and lower ends of the middle tool post to protect the threaded holes. This utility model, through the multiple threaded holes, facilitates fixing the middle tool post in different positions on the connecting rod, allowing adjustment of the distance between the upper and middle tool posts, facilitating the machining of cavities of different depths. Furthermore, the connecting plates reduce wear on the limiting ribs, increasing the tool holder's service life. The connecting plates also protect the threaded holes, preventing debris from entering the threaded holes.

Description

Technical Field

[0001] This utility model relates to the field of PCD reamer technology, specifically to a PCD reamer with positive and negative chamfering. Background Technology

[0002] A chamfering PCD reamer is a rotating tool with one or more cutting teeth used to remove a thin layer of metal from the surface of a machined hole. For example, the positive and negative chamfering PCD reamer disclosed in Chinese Patent Application No. CN202222540620.7 specifically involves inserting an upper tool post, a middle tool post, and a lower tool post into a fixed post and a limiting post via upper, middle, and lower limit slots, and fixing them with a fixing nut. It allows switching between upper, middle, and lower polycrystalline diamond inserts to use different sizes of workpieces with different tool posts, achieving the goal of easily switching the chamfering PCD reamer according to the workpiece's usage requirements. However, it has the following technical problems:

[0003] The lengths of the upper tool post, middle tool post, and lower tool post are fixed. When the lower tool post is machining a machined hole with a depth greater than the length of the lower tool post, the cutting tool in the middle tool post is prone to cutting the upper end of the machined hole. It can be seen that the above structure is prone to over-cutting when machining deep holes. Utility Model Content

[0004] Therefore, this utility model provides a PCD reamer with positive and negative chamfering to solve the problem of over-cutting in the prior art when machining deep holes.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A PCD reamer with both positive and negative chamfering, including a tool holder.

[0007] A connecting rod is installed at the lower end of the tool holder, and an upper tool post, a middle tool post, and a lower tool post are sequentially installed on the connecting rod.

[0008] The connecting rod has multiple threaded holes in its middle section for positioning the centering tool holder.

[0009] The middle of the tool holder is equipped with a bolt 2 that is threaded to the threaded hole 2, and the upper and lower ends of the tool holder are equipped with connecting plates for protecting the threaded hole 2.

[0010] Furthermore, a bolt two that is threadedly connected to the threaded hole two is installed in the middle of the middle tool holder, and connecting plates for protecting the threaded hole two are installed at the upper and lower ends of the middle tool holder.

[0011] Furthermore, a bolt is installed in the middle of the upper tool post for positioning the upper tool post with a threaded hole. The upper and lower tool posts have the same structure, and a bolt is installed on the lower tool post simultaneously. The upper and lower tool posts have different diameters: the diameter of the upper tool post is larger than that of the middle tool post, and the diameter of the middle tool post is larger than that of the lower tool post.

[0012] Furthermore, the inner wall of the upper tool holder is provided with a limiting groove three for the extension and retraction of the connecting plate, and the inner wall of the upper tool holder is provided with limiting groove two at equal intervals for the extension and retraction of the limiting ribs.

[0013] Furthermore, a limiting groove four is provided in the middle of the central tool holder, and bolt two passes through the limiting groove four and is screwed into threaded hole two. A limiting groove five is provided on the inner wall of the central tool holder for the limiting rib to extend and retract.

[0014] This utility model has the following advantages:

[0015] This utility model, through the setting of multiple threaded holes, facilitates the fixing of the middle tool holder at different positions on the connecting rod, so as to adjust the distance between the upper tool holder and the middle tool holder, and facilitates the processing of cavities of different depths. Furthermore, the setting of the connecting plate reduces the wear of the limiting ribs, increases the service life of the tool holder, and the connecting plate also protects the threaded holes to prevent waste from entering the interior of the threaded holes. Attached Figure Description

[0016] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0017] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the knife handle of this utility model;

[0020] Figure 3 This is a schematic diagram of the upper tool holder of this utility model;

[0021] Figure 4 This is a schematic diagram of the tool holder in this utility model.

[0022] In the diagram: 10-tool holder, 11-limiting groove one, 12-connecting rod, 13-limiting rib, 14-threaded hole one, 15-threaded hole two, 20-upper tool holder, 21-bolt one, 22-limiting groove two, 23-limiting groove three, 30-middle tool holder, 31-limiting groove four, 32-bolt two, 33-limiting groove five, 34-connecting plate, 40-lower tool holder. Detailed Implementation

[0023] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] The terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Any changes or adjustments to their relative relationships, without substantially altering the technical content, shall also be considered within the scope of implementation of this utility model.

[0025] Please see Figures 1-4 This utility model provides a PCD reamer for both positive and negative chamfering, including a tool holder 10. A connecting rod 12 is fixedly installed at the lower middle part of the tool holder 10, and the axes of the tool holder 10 and the connecting rod 12 coincide. An upper tool holder 20, a middle tool holder 30, and a lower tool holder 40 are sequentially installed on the rod body of the connecting rod 12. The arrangement of the upper tool holder 20, the middle tool holder 30, and the lower tool holder 40 facilitates the positive and negative chamfering of cavities with different diameters. Furthermore, the middle tool holder 30 provided by this utility model can be adjusted up and down, so as to avoid over-cutting of the cavity to be cut when processing cavities of different depths.

[0026] The connecting rod 12 has multiple threaded holes 15 in the middle for positioning the middle tool holder 30. The multiple threaded holes 15 are equidistant. The threaded holes 15 facilitate the limiting of the middle tool holder 30 to adjust the distance between the middle tool holder 30 and the upper tool holder 20. When the lower tool holder 40 is machining a deep hole, the middle tool holder 30 moves closer to the upper tool holder 20. When the middle tool holder 30 is machining a deep hole, the middle tool holder 30 moves closer to the lower tool holder 40.

[0027] A bolt 32, threaded to the threaded hole 15, is installed in the middle of the middle tool post 30. Connecting plates 34 are fixedly installed at the upper and lower ends of the middle tool post 30 to protect the threaded hole 15. The connecting plates 34 prevent cutting debris from entering the threaded hole 15, thus protecting it. Furthermore, the connecting plates 34 ensure that when the upper tool post 20, middle tool post 30, and lower tool post 40 rotate, the connecting plates 34 simultaneously protect the upper tool post. 20. The middle tool holder 30 and the lower tool holder 40 are limited so that when the connecting rod 12 drives the upper tool holder 20, the middle tool holder 30 and the lower tool holder 40 to rotate, multiple limiting ribs 13 simultaneously drive the upper tool holder 20, the middle tool holder 30 and the lower tool holder 40 to rotate, and the connecting plate 34 simultaneously drives the upper tool holder 20, the middle tool holder 30 and the lower tool holder 40 to rotate, so as to reduce the wear of the upper tool holder 20, the middle tool holder 30 and the lower tool holder 40 on the limiting ribs 13, thereby increasing the service life of the tool holder 10.

[0028] The tool holder 10 has a limiting groove 11 in the middle for the connecting plate 34 to extend and retract. The connecting plate 34 can slide up and down in the limiting groove 11 by limiting the connecting plate 34. When the tool holder 10 drives the connecting rod 12 to rotate, the tool holder 10 drives the connecting plate 34 to rotate synchronously, so that the connecting plate 34 can drive the upper tool holder 20, the middle tool holder 30 and the lower tool holder 40 to rotate synchronously.

[0029] Multiple limiting ribs 13 are fixedly installed at equal intervals on the outer wall of the connecting rod 12. These ribs not only position the upper tool holder 20, middle tool holder 30, and lower tool holder 40, but also ensure that the upper tool holder 20, middle tool holder 30, and lower tool holder 40 rotate synchronously with the connecting rod 12. Threaded holes 14 for positioning the upper tool holder 20 and lower tool holder 40 are machined at both the upper and lower ends of the connecting rod 12.

[0030] The upper tool post 20 is equipped with a bolt 21 in the middle for positioning the upper tool post 20 by engaging with the threaded hole 14. The upper tool post 20 and the lower tool post 40 have the same structure. The lower tool post 40 is also equipped with bolt 21. The upper tool post 20 and the lower tool post 40 have different diameters. The diameter of the upper tool post 20 is larger than that of the middle tool post 30, and the diameter of the middle tool post 30 is larger than that of the lower tool post 40.

[0031] The inner wall of the upper tool holder 20 is provided with a limiting groove 3 23 for the extension and retraction of the connecting plate 34. The connecting plate 34 can slide up and down in the limiting groove 3 23. The inner wall of the upper tool holder 20 is provided with limiting grooves 22 at equal intervals for the extension and retraction of the limiting ribs 13. When installing the upper tool holder 20, the limiting grooves 22 and the limiting ribs 13 are aligned, and the limiting grooves 3 23 and the limiting grooves 11 are aligned, so that the connecting rod 12 passes through the middle cavity of the upper tool holder 20, and the multiple limiting ribs 13 slide synchronously in the multiple limiting grooves 22. When the top of the upper tool holder 20 and the bottom of the tool handle 10 abut, the bolt 21 is rotated so that the bolt 21 is screwed into the threaded hole 14 at the upper end of the connecting rod 12, so as to lock the upper tool holder 20.

[0032] The middle tool holder 30 has a limiting groove 4 31 in its middle part, and bolt 2 32 passes through the limiting groove 4 31 and is screwed into the threaded hole 2 15. The inner wall of the middle tool holder 30 has a limiting groove 5 33 for the extension and retraction of the limiting rib 13. After the upper tool holder 20 is fixed to the upper end of the connecting rod 12, the middle tool holder 30 is sleeved on the outside of the connecting rod 12, so that the connecting rod 12 passes through the middle cavity of the middle tool holder 30, and the connecting plate 34 passes through the limiting groove 3 23 and is inserted into the limiting groove 11. The limiting rib 13 slides synchronously in the limiting groove 5 33. By rotating bolt 2 32, the middle tool holder 30 can be fixed in the middle of the connecting rod 12. After the middle tool holder 30 is installed in the middle of the connecting rod 12, the lower tool holder 40 is sleeved on the lower end of the connecting rod 12, and the lower tool holder 40 is fixed to the lower end of the connecting rod 12 by bolt 1 21.

[0033] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A PCD reamer with both positive and negative chamfering, comprising a shank (10), characterized in that: The lower end of the tool holder (10) is equipped with a connecting rod (12), and the upper tool holder (20), the middle tool holder (30) and the lower tool holder (40) are sequentially installed on the rod body of the connecting rod (12); The connecting rod (12) has multiple threaded holes (15) in the middle for positioning the centering tool holder (30); The middle of the tool holder (30) is equipped with a bolt (32) that is threaded to the threaded hole (15), and the upper and lower ends of the tool holder (30) are equipped with connecting plates (34) for protecting the threaded hole (15).

2. The PCD reamer with positive and negative chamfering according to claim 1, characterized in that: The tool holder (10) has a limiting groove (11) in the middle for the extension and retraction of the connecting plate (34). The outer wall of the connecting rod (12) is provided with multiple limiting ribs (13) at equal intervals. The upper and lower ends of the connecting rod (12) are machined with threaded holes (14) for positioning the upper tool holder (20) and the lower tool holder (40).

3. A PCD reamer with positive and negative chamfering according to claim 2, characterized in that: The upper tool holder (20) is equipped with a bolt (21) for positioning the upper tool holder (20) by engaging a threaded hole (14). The upper tool holder (20) and the lower tool holder (40) have the same structure. The bolt (21) is installed on the lower tool holder (40) at the same time. The upper tool holder (20) and the lower tool holder (40) have different diameters. The diameter of the upper tool holder (20) is larger than that of the middle tool holder (30), and the diameter of the middle tool holder (30) is larger than that of the lower tool holder (40).

4. A PCD reamer with positive and negative chamfering according to claim 2, characterized in that: The inner wall of the upper tool holder (20) is provided with a limiting groove three (23) for the extension and retraction of the connecting plate (34), and the inner wall of the upper tool holder (20) is provided with a limiting groove two (22) for the extension and retraction of the limiting rib (13) at equal intervals.

5. A PCD reamer with positive and negative chamfering according to claim 2, characterized in that: The middle of the tool holder (30) has a limiting groove four (31) and a bolt two (32) passes through the limiting groove four (31) and is screwed into the threaded hole two (15). The inner wall of the middle tool holder (30) has a limiting groove five (33) for the extension and retraction of the limiting rib (13).

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