Boring cutter for machining inner hole of small hole
By designing a dual-head internal boring tool with a four-sided fixed structure and replaceable tool heads, the problems of short tool life and poor stability of internal boring tools are solved, thereby improving machining quality and yield.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN LITAI PRECISION TECH CO LTD
- Filing Date
- 2025-05-20
- Publication Date
- 2026-05-01
AI Technical Summary
Existing internal boring tools have complex structures and unreasonable designs. Single-head use leads to short lifespan and poor stability. Single-sided positioning during heavy cutting causes vibration and high defect rate.
A dual-head internal boring tool was designed with a four-sided fixed structure, including a tool body, a cutting blade, and a screwdriver. The cutting blade is fixed through threaded holes and through holes, and the limiting surface and limiting groove cooperate to ensure stability. The tool head is replaceable to extend its service life.
It achieves a simple structure, long service life, good stability, high yield of cut products, and improved processing quality.
Smart Images
Figure CN224182108U_ABST
Abstract
Description
A boring tool for machining small holes Technical Field
[0001] This utility model relates to the field of alloy material processing technology, specifically to a boring tool for machining small holes. Background Technology
[0002] Turning tools are commonly used on CNC lathes. They are pre-manufactured polygonal inserts with multiple cutting edges, which are mechanically clamped onto the tool body. CNC inserts are a general term for indexable turning inserts and are the mainstream products in modern metal cutting applications. They are mainly used in turning, milling, parting, grooving, and thread turning of metals. Internal boring tools are one type of turning tool.
[0003] Currently, existing internal boring tools have complex structures and unreasonable designs, allowing only single-end operation, resulting in short tool life. Furthermore, internal boring tools typically use a single-sided tool holder for positioning during machining; under heavy cutting conditions, this single-sided tool holder positioning causes vibration, leading to poor stability and a high defect rate in the machined products. To address this problem, the inventors designed a new internal boring tool for machining small holes. Summary of the Invention
[0004] The purpose of this utility model is to provide a boring tool for machining small holes, which has the advantages of simple structure, reasonable design, double-ended operation, long service life, four-sided fixing, good stability, and high yield of machined products, thus solving the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a boring tool for machining small holes, comprising:
[0006] The blade includes a shank, one end of which has a mounting surface, a mounting groove, and a threaded hole that passes through the shank.
[0007] The blade is installed in the mounting groove and includes a blade piece. The blade piece has two limiting surfaces on its side, which are symmetrically arranged about the central axis of the blade piece. The blade piece has a through hole that matches the threaded hole. Both ends of the blade piece are provided with cutting heads. Each cutting head includes a guide surface. The end of the guide surface is provided with a first bevel and a second bevel. A cutting head is formed between the first bevel and the second bevel.
[0008] A screwdriver, wherein the screwdriver passes through a through hole and a threaded hole from the outside in, and the blade is fixed to the blade body.
[0009] Preferably, a limiting surface is provided on one side of the outer side of the mounting groove, and a limiting groove is provided on the other side of the inner side. The end of the limiting groove away from the threaded hole has an engagement groove.
[0010] Preferably, both the first limiting surface and the limiting groove are fitted to the second limiting surface, wherein the limiting groove and the threaded hole form an angle between the limiting surface and the threaded hole, and the angle value is between 102° and 170°.
[0011] Preferably, the limiting groove gradually narrows from one end of the threaded hole to the other end.
[0012] Preferably, the cutting head and the guide surface form an angle between 130° and 175°.
[0013] Preferably, the guide surface has a clearance surface on the side facing the blade.
[0014] Preferably, the guide surface has a material guiding surface on the side near the cutting head.
[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0016] 1. This utility model provides a boring tool for machining small holes. The boring tool includes a tool body, a cutting blade, and a screwdriver. The overall structure is simple and reasonably designed. The cutting blade includes a cutting insert, and the two ends of the cutting insert are staggered with cutting heads. When one cutting head is worn, the other cutting head can be replaced, thereby extending the service life of the boring tool and making it highly practical.
[0017] 2. The tool body of this utility model includes a tool shank, and a mounting surface is provided at one end of the tool shank. A mounting groove is provided in the mounting surface. A limiting surface is provided on one side of the outer side of the mounting groove, and a limiting groove is provided on the other side of the inner side. Compared with the traditional single-sided fixing, the four-sided limiting stability is good under heavy cutting conditions, which improves the yield of the cut products. Attached Figure Description
[0018] Figure 1 is a schematic diagram of the main structure of this utility model;
[0019] Figure 2 is a front exploded view of this utility model;
[0020] Figure 3 is a front view of the blade in Figure 1 of this utility model.
[0021] Figure 4 is a rear view of the blade structure in Figure 1 of this utility model;
[0022] Figure 5 is a schematic diagram of the use of this utility model.
[0023] The reference numerals and names in the figure are as follows:
[0024] 1. Blade body; 11. Blade shank; 12. Mounting surface; 13. Mounting groove; 14. Threaded hole; 15. Limiting surface one; 16. Limiting groove; 17. Fitting groove; 2. Blade; 21. Cutting insert; 22. Limiting surface two; 23. Through hole; 24. Blade head; 241. Guide surface; 242. Beveled surface one; 243. Beveled surface two; 244. Cutting head; 245. Avoidance surface; 246. Material guide surface; 3. Screwdriver. Detailed Implementation
[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0026] In the description of the embodiments of this utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the embodiments of this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this utility model, "multiple" means two or more, unless otherwise explicitly specified.
[0027] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.
[0028] Please refer to Figures 1 to 4. One embodiment of this utility model is provided: a boring tool for machining small holes, comprising: a tool body 1, the tool body 1 including a tool shank 11, a mounting surface 12 at one end of the tool shank 11, a mounting groove 13 in the mounting surface 12, a threaded hole 14 penetrating the tool shank 11 in the mounting groove 13, a limiting surface 15 on one side of the outer side of the mounting groove 13, and a limiting groove 16 on the other side of the inner side, a fitting groove 17 at the end of the limiting groove 16 away from the threaded hole 14, the limiting surface 15 and the limiting groove 16 both fitting with the limiting surface 22, wherein the limiting groove 16 and the threaded hole 14 form an included angle, the angle value of which is between 120° and 170°, and the limiting groove 16 gradually shrinks from one end of the threaded hole 14 to the other end;
[0029] Blade 2 is installed in mounting groove 13 and includes blade 21. Two limiting surfaces 22 are provided on the side of blade 21. The two limiting surfaces 22 are symmetrically arranged about the central axis of blade 21. A through hole 23 adapted to the threaded hole 14 is provided in blade 21. Blade head 24 is provided at both ends of blade 21. Each blade head 24 includes a guide surface 241. The end of the guide surface 241 is provided with a first bevel 242 and a second bevel 243. A cutting head 244 is formed between the first bevel 242 and the second bevel 243. An angle is formed between the cutting head 244 and the guide surface 241. The angle value of the angle is between 130° and 175°. A clearance surface 245 is provided on the side of the guide surface 241 facing the blade body 1. A material guiding surface 246 is provided on the side of the guide surface 241 near the cutting head 244.
[0030] Screwdriver 3 passes through through hole 23 and threaded hole 14 from the outside to the inside, fixing blade 2 to the blade body 1.
[0031] Please refer to Figures 1 to 4 again. When the blade 2 is in use, if one of the cutting heads 24 at both ends of the cutting edge 21 is worn, the other can be replaced, thereby extending the service life of the back-sweeping blade. When installing the blade 2, the cutting edge 21 of the blade 2 is installed in the limiting groove 16, and one of the cutting heads 22 of the blade 2 is limited by the limiting groove 16. The second limiting surface 22 on the cutting edge 21 is in contact with the first limiting surface 15 and the limiting groove 16 respectively. The four-sided limiting and fixing has good stability and improves the yield of the cut products.
[0032] Please refer to Figure 5. When the internal boring tool of this utility model is working, the cutting head 244 on the tool head 24 contacts the workpiece 4 to cut. The processed chips are guided and discharged by the guide surface 246 to avoid accumulating at the cutting point and affecting the cutting quality.
[0033] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. A boring tool for machining small holes, characterized in that, include: The blade (1) includes a shank (11), one end of which has a mounting surface (12) and a mounting groove (13) therein. A threaded hole (14) is formed in the mounting groove (13) through the shank (11). The blade (2) is installed in the mounting groove (13) and includes a cutting edge (21). Two limiting surfaces (22) are formed on the side of the cutting edge (21). The two limiting surfaces (22) are symmetrically arranged about the central axis of the cutting edge (21). The blade (21) has a through hole (23) adapted to the threaded hole (14). Both ends of the blade (21) are provided with blade heads (24). Each blade head (24) includes a guide surface (241). The end of the guide surface (241) is provided with a first bevel (242) and a second bevel (243). A cutting head (244) is formed between the first bevel (242) and the second bevel (243). A screwdriver (3) passes through the through hole (23) and the threaded hole (14) from the outside to the inside, and fixes the blade (2) on the blade body (1).
2. The boring tool for machining small holes according to claim 1, characterized in that: The mounting groove (13) has a limiting surface (15) on one side of its exterior and a limiting groove (16) on the other side of its interior. The limiting groove (16) has a fitting groove (17) at one end away from the threaded hole (14).
3. The boring tool for machining small holes according to claim 2, characterized in that: The limiting surface one (15) and the limiting groove (16) are both in contact with the limiting surface two (22), wherein the limiting groove (16) and the threaded hole (14) form an angle between the limiting groove (16) and the threaded hole (14), and the angle value of the angle is between 120° and 170°.
4. The boring tool for machining small holes according to claim 1, characterized in that: The limiting groove (16) gradually shrinks from one end of the threaded hole (14) to the other end.
5. A boring tool for machining small holes according to claim 1, characterized in that: The cutting head (244) and the guide surface (241) form an angle between the cutting head (244) and the guide surface (241), and the angle value is between 130° and 175°.
6. The boring tool for machining small holes according to claim 1, characterized in that: The guide surface (241) has a clearance surface (245) on the side facing the blade (1).
7. A boring tool for machining small holes according to claim 1, characterized in that: The guide surface (241) has a guide surface (246) on the side near the cutting head (244).