Self-positioning boring cutter structure

Abstract

The utility model relates to the technical field of machining cutters, in particular to a self-positioning boring cutter structure. Comprising a cutter rod and a cutter body, the cutter rod is provided with an insertion rod and a locking bolt, the insertion rod is detachably connected with the cutter rod and penetrates through the cutter rod, the locking bolt is in threaded connection with the cutter rod and located on the outer side of the cutter body, the cutter body is detachably connected with the cutter rod and located on the outer side of the cutter rod, and the cutter body is provided with a first inclined face and an attaching groove matched with the locking bolt. Therefore, the stability of connection between the cutter body and the cutter bar is improved, damage caused by knocking on equipment is effectively avoided, distribution of cutting force on the cutter body is optimized by reasonably designing structural parameters such as the included angles and the chamfers, the problem of cutter abrasion or damage caused by too large local stress is avoided, and the service life of the cutter is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of machining tool technology, and in particular to a self-positioning boring tool structure. Background Technology

[0002] Currently, most boring operations use single-edged boring tools, which are slow and inaccurate due to the single cutting edge. Furthermore, many machined holes require chamfering, necessitating an additional chamfering tool and wasting time. Later, a type of boring tool emerged with two symmetrical cutting edges and a chamfering edge on the tip, allowing for one-step enlargement and chamfering. However, this introduced new problems: the boring length could not be precisely positioned, and the feed rate relied entirely on the operator's experience, increasing labor intensity and wasting time and effort. Additionally, any breakage or damage to the cutting edge necessitates tool replacement, resulting in material waste.

[0003] To address the aforementioned issues, existing patent (CN203030931U) discloses a positioning boring tool, comprising a tool head and a tool holder, wherein the tool holder and tool head are manufactured separately, and the tool head is connected to the tool holder through a positioning hole. The tool head includes a cutting edge and a chamfering edge. This structure overcomes the shortcomings of manual machining based on experience, which results in low accuracy and requires tool replacement for cutting and chamfering. It provides an improved boring tool in which the tool head and tool holder are connected by a positioning block, which has the function of positioning the feed rate, thereby improving machining accuracy. At the same time, cutting and chamfering are completed in one operation, saving machining time.

[0004] However, in the current technology, using a hammering method to position and connect the cutting head and the tool holder will accelerate the wear at the connection point, thereby reducing the service life of the cutting head and the tool holder. Furthermore, hammering errors can easily cause injury to the operator's hands and the machine tool. Utility Model Content

[0005] The purpose of this utility model is to provide a self-positioning boring bar structure, which aims to solve the technical problems in the prior art where the tool head and tool holder are positioned and connected by striking, which accelerates the wear at the connection between the tool head and tool holder, thereby reducing the service life of the tool head and tool holder, and the striking error can easily cause injury to the operator's hands and the processing machine tool.

[0006] To achieve the above objectives, this utility model employs a self-positioning boring bar structure, comprising a tool shank and a tool body. The tool shank has an insertion rod and a locking bolt. The insertion rod is detachably connected to the tool shank and passes through the tool shank. The locking bolt is threadedly connected to the tool shank and is located on the outside of the tool body. The tool body is detachably connected to the tool shank and is located on the outside of the tool shank. The tool body has a first inclined surface and a fitting groove adapted to the locking bolt.

[0007] The blade body has a through hole with a radius of 0.8 mm.

[0008] The blade body has a first center line, and the first inclined surface forms a first angle α with the first center line, and the first angle α is 29°.

[0009] The fitting groove and the blade body form a second included angle β, and the second included angle β is 60°.

[0010] The blade body has a first chamfer γ, a second chamfer δ, a third chamfer ε and a fourth chamfer ζ. The radius of the first chamfer γ is 4 mm, the radius of the second chamfer δ is 0.2 mm, the radius of the third chamfer ε is 0.2 mm, and the radius of the fourth chamfer ζ is 8°.

[0011] The third chamfer ε forms a second inclined surface η with the first center line, and the second inclined surface η is 6°.

[0012] The blade body has a third included angle θ, which is 30°.

[0013] The blade has a second center line, and the blade forms a third angle ι with the second center line, wherein the second angle ι is 6°.

[0014] This utility model discloses a self-positioning boring bar structure. In practical use, the cutting tool body is inserted into the cutting tool shank, and the insertion rod is inserted into the cutting tool body and fits against the first inclined surface, thereby preventing the cutting tool body from loosening left and right. By rotating the locking bolt, the locking bolt abuts against the cutting tool body through the fitting groove, thereby achieving complete fixation of the cutting tool body. Therefore, it can effectively solve the problem that the hammering method will reduce the service life of the cutting head and the cutting tool shank. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a self-positioning boring bar structure according to this utility model.

[0017] Figure 2 This is an exploded view of the structure of a self-positioning boring bar of this utility model.

[0018] Figure 3 This is a front view of the blade body of this utility model.

[0019] Figure 4 This is the utility model Figure 3 Enlarged view of the local structure at point A.

[0020] Figure 5 This is a top view of the blade of this utility model.

[0021] 1-Tool holder, 2-Tool body, 3-Insert rod, 4-Locking bolt, 5-Matching groove, 6-Through hole. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0023] Please see Figures 1 to 5 This utility model provides a self-positioning boring bar structure, including a tool holder 1 and a tool body 2. The tool holder 1 has an insertion rod 3, a locking bolt 4, and a through hole 6. The insertion rod 3 is detachably connected to the tool holder 1 and passes through the tool holder 1. The locking bolt 4 is threadedly connected to the tool holder 1 and is located on the outside of the tool body 2. The tool body 2 is detachably connected to the tool holder 1 and is located on the outside of the tool holder 1. The tool body 2 has a first inclined surface and a fitting groove 5 adapted to the locking bolt 4.

[0024] In this embodiment, the tool holder 1 is hollow, which reduces the radial cutting force, thereby reducing the bending deformation of the tool holder 1 and improving the machining stability. The tool body 2 is inserted into the tool holder 1, and the insertion rod 3 is inserted into the tool body 2 and fits against the first inclined surface, thereby preventing the tool body 2 from loosening left and right. Rotating the locking bolt 4, the locking bolt 4 abuts against the tool body 2 through the fitting groove 5, thereby achieving complete fixation of the tool body 2. Therefore, it can effectively solve the problem that the hammering method will reduce the service life of the tool head and tool holder.

[0025] Furthermore, the blade body 2 has a through hole 6, and the radius of the through hole 6 is 0.8 mm.

[0026] In this embodiment, a large amount of chips and heat are generated during the cutting process. The through hole 6 helps to remove chips and dissipate heat, thereby keeping the cutting area clean and cool, improving cutting efficiency and tool durability.

[0027] Furthermore, the blade body 2 has a first center line, the first inclined surface forms a first angle α with the first center line, and the first angle α is 29°.

[0028] In this embodiment, the insertion rod 3 is engaged by the first included angle α, which allows the insertion rod 3 to effectively restrict the blade body 2, preventing the blade body 2 from wobbling left and right after installation, thereby improving the stability of the blade body 2 during operation.

[0029] Furthermore, the fitting groove 5 and the blade body 2 form a second included angle β, and the second included angle β is 60°.

[0030] In this embodiment, the second included angle β allows the fitting groove 5 to be interchangeably adapted to the locking bolt 4, thereby effectively resisting the blade body 2 when the locking bolt 4 rotates, achieving complete fixation of the blade body 2. This not only improves the stability of the connection between the blade body 2 and the blade rod 1, but also avoids the problem of accelerated wear at the connection point caused by the existing hammering method, thus extending the service life of the equipment.

[0031] Furthermore, the blade body 2 has a first chamfer γ, a second chamfer δ, a third chamfer ε, and a fourth chamfer ζ. The radius of the first chamfer γ is 4 mm, the radius of the second chamfer δ is 0.2 mm, the radius of the third chamfer ε is 0.2 mm, and the radius of the fourth chamfer ζ is 8°.

[0032] In this embodiment, the radius of the first chamfer γ is 4mm, which is mainly used to provide a larger transition area, reduce stress concentration between the tool and the workpiece during cutting, thereby extending the tool's service life and assisting in guiding chip removal; the radius of the second chamfer δ is 0.2mm, providing a smaller transition area, which is mainly used to reduce the risk of chipping of the cutting edge and improve the durability of the cutting edge; the radius of the third chamfer ε is 0.2mm, which can reduce friction between the cutting edge and the workpiece, and reduce the cutting force and cutting temperature during the cutting process; the fourth chamfer ζ is 8°, which is mainly used to provide sharpness adjustment of the tool body 2. By changing the angle of the chamfer, the cutting performance and durability of the tool body 2 can be adjusted, and the anti-chipping ability of the cutting edge can be improved, thus extending the tool's service life.

[0033] Furthermore, the third chamfer ε forms a second inclined surface η with the first center line, and the second inclined surface η is 6°.

[0034] In this embodiment, the second inclined surface η is used to provide better guidance and support during the cutting process. The cutting force and heat generated during cutting can be more effectively dispersed by the second inclined surface η, thereby protecting the tool from damage and improving cutting efficiency and machining accuracy.

[0035] Furthermore, the blade body 2 has a third included angle θ, which is 30°.

[0036] In this embodiment, the third included angle θ makes the overall structure of the cutter body 2 more stable, ensuring that the cutter body 2 will not shift or shake due to uneven force during processing, thereby improving the processing accuracy and stability.

[0037] Furthermore, the blade body 2 has a second center line, and the blade body 2 forms a third included angle ι with the second center line, and the second included angle ι is 6°.

[0038] In this embodiment, the second included angle ι helps to reduce cutting resistance and improve cutting efficiency during the cutting process. Furthermore, the reasonable design of the second included angle ι also helps to improve the rigidity of the tool body 2, ensuring that a stable cutting state can be maintained during the cutting process, thereby improving machining accuracy and surface quality.

[0039] The beneficial effects of this utility model are as follows: The blade body 2 is inserted into the blade rod 1, and the insertion rod 3 is inserted into the blade body 2. The insertion rod 3 is in contact with the first inclined surface, which avoids the blade body 2 from wobbling left and right after installation. By rotating the locking bolt 4, the locking bolt 4 abuts against the blade body 2 through the fitting groove 5, thereby completely fixing the blade body 2. This improves the stability of the connection between the blade body 2 and the blade rod 1, effectively avoids damage caused by impacts to the equipment, and optimizes the distribution of cutting force on the blade body 2 by reasonably designing structural parameters such as the included angles and chamfers, avoiding the problem of tool wear or breakage caused by excessive local force, and extending the service life of the tool.

[0040] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.

Claims

1. A self-positioning boring bar structure, characterized in that, The device includes a tool holder and a tool body. The tool holder has an insertion rod and a locking bolt. The insertion rod is detachably connected to the tool holder and passes through the tool holder. The locking bolt is threaded to the tool holder and is located on the outside of the tool body. The tool body is detachably connected to the tool holder and is located on the outside of the tool holder. The tool body has a first inclined surface and a fitting groove adapted to the locking bolt.

2. The self-positioning boring bar structure as described in claim 1, characterized in that, The blade body has a through hole with a radius of 0.8 mm.

3. The self-positioning boring bar structure as described in claim 2, characterized in that, The blade has a first centerline, and the first inclined surface forms a first angle α with the first centerline, and the first angle α is 29°.

4. The self-positioning boring bar structure as described in claim 3, characterized in that, The fitting groove forms a second included angle β with the blade body, and the second included angle β is 60°.

5. The self-positioning boring bar structure as described in claim 4, characterized in that, The blade has a first chamfer γ, a second chamfer δ, a third chamfer ε and a fourth chamfer ζ. The radius of the first chamfer γ is 4 mm, the radius of the second chamfer δ is 0.2 mm, the radius of the third chamfer ε is 0.2 mm, and the radius of the fourth chamfer ζ is 8°.

6. The self-positioning boring bar structure as described in claim 5, characterized in that, The third chamfer ε forms a second inclined surface η with the first center line, and the second inclined surface η is 6°.

7. The self-positioning boring bar structure as described in claim 6, characterized in that, The blade has a third included angle θ, which is 30°.

8. The self-positioning boring bar structure as described in claim 7, characterized in that, The blade has a second center line, and the blade forms a third angle ι with the second center line, and the second angle ι is 6°.

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