CBN stepped boring inner hole cutter

Abstract

The utility model belongs to the technical field of inner hole machining cutters, and particularly relates to a CBN stepped boring inner hole cutter which comprises a cutter head and a cutter clamp body, and at least three sliding blocks are arranged on the cutter head in a circumferential array mode. The tool holder body is arranged on the sliding block in a sliding mode, at least two screw holes are formed in the sliding block, installation holes are formed in the tool holder body, and the tool holder body fixes the sliding block through matching of bolts, the installation holes and the screw holes.

Description

Technical Field

[0001] The utility model belongs to the technical field of inner hole processing tools, and more specifically, relates to a CBN step boring inner hole tool. Background Art

[0002] In the field of mechanical processing, especially in the precision boring of high-hardness materials, cubic boron nitride (CBN) tools are widely used in the processing of key parts in industries such as automobiles, aerospace, and molds due to their excellent hardness, thermal stability, and wear resistance. However, existing CBN boring tool structures generally have problems with a small adjustment range and poor adaptability, making it difficult to meet the needs of different hole diameters and machining allowances. Traditional tools usually use a single blade fixed structure, which can only be adjusted slightly within a limited range. As a result, when facing multi-step holes or variable diameter machining, the tool needs to be frequently replaced or re-clamped, which seriously affects processing efficiency and precision.

[0003] Therefore, in view of this, the existing structure and defects are studied and improved, and a CBN step boring internal hole tool is provided in order to achieve a more practical purpose. Utility Model Content

[0004] Based on the problems mentioned in the above background technology, the utility model provides a CBN step boring tool.

[0005] The technical solution adopted by the utility model is as follows: a CBN step boring internal hole tool, including a cutter disc and a tool holder body, the cutter disc has at least three sliding blocks in a circumferential array; the tool holder body is slidably arranged on the sliding block, the sliding block is provided with at least two screw holes, the tool holder body is provided with a mounting hole, and the tool holder body fixes the sliding block by means of bolts, the mounting holes and the screw holes.

[0006] Furthermore, the sliding block is provided with a plurality of mounting teeth, and the bottom of the tool holder body is provided with sliding teeth that mesh with the mounting teeth.

[0007] Furthermore, the mounting hole is a waist groove type.

[0008] Furthermore, the thickness of the highest point of each sliding block decreases by 0.5-1 mm.

[0009] Furthermore, the tool holder body is provided with scale lines.

[0010] Furthermore, the tool holder body is provided with an adjustment hole connected with the mounting hole, a fine-tuning screw is provided in the adjustment hole, and the fine-tuning screw is in contact with the bolt.

[0011] Beneficial effects of the utility model:

[0012] 1. The sliding locking mechanism between the slide block and the toolholder allows the operator to flexibly adjust the toolholder's position based on actual machining requirements, thereby varying the tool extension length and enabling efficient machining of various apertures or stepped holes. Multiple screw holes also provide multi-level fine-tuning options, enhancing adjustment precision. This structure significantly expands the tool's applicability and machining flexibility, reduces the need for frequent tool changes, and improves machining efficiency and process stability.

[0013] 2. Through the guidance and limiting effect of the tooth structure, the tool holder is not prone to lateral displacement or rotation during the sliding process, ensuring the repeatability and stability of the tool position after each adjustment.

[0014] 3. The slotted mounting holes offer greater axial freedom than circular holes, allowing the toolholder to slide continuously within a certain range without repeated bolt removal. This design, combined with the multiple screw holes on the slide block, allows the operator to quickly slide and reposition the toolholder without completely removing the fasteners, simultaneously increasing adjustment efficiency and extending the tool adjustment range. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention can be further described by way of non-limiting examples given in the accompanying drawings;

[0016] Figure 1 It is a schematic diagram of the utility model;

[0017] Figure 2 This is an explosion diagram of the utility model;

[0018] Figure 3 This is a side view of the utility model;

[0019] The attached drawings are marked as follows:

[0020] The cutter disc 100 , the sliding block 110 , the screw hole 120 , the mounting teeth 130 , the tool holder body 200 , the mounting hole 210 , the sliding teeth 220 , the scale line 230 , the adjustment hole 240 , the fine-tuning screw 250 , and the bolt 300 . DETAILED DESCRIPTION

[0021] like Figures 1 to 3 As shown, a CBN step boring internal hole tool includes a cutter disc 100 and a tool holder body 200. The cutter disc 100 has at least three sliding blocks 110 in a circumferential array; the tool holder body 200 is slidably set on the sliding block 110, and the sliding block 110 is provided with at least two screw holes 120. The tool holder body 200 is provided with a mounting hole 210, and the tool holder body 200 fixes the sliding block 110 by means of a bolt 300 that cooperates with the mounting hole 210 and the screw hole 120.

[0022] Using this technical solution, the sliding locking mechanism between the slide block 110 and the toolholder 200 allows the operator to flexibly adjust the position of the toolholder 200 according to actual processing requirements, thereby varying the tool extension length and effectively processing holes of varying diameters or stepped holes. Furthermore, the multiple screw holes 120 provide multi-level fine-tuning options, enhancing adjustment precision. Consequently, this structure significantly expands the tool's applicability and processing flexibility, reduces the need for frequent tool changes, and improves processing efficiency and process stability.

[0023] As a preferred embodiment, the sliding block 110 is provided with a plurality of mounting teeth 130, and the bottom of the tool holder body 200 is provided with sliding teeth 220 that mesh with the mounting teeth 130. The guiding and limiting effects of the toothed structure prevent the tool holder body 200 from lateral displacement or rotation during sliding, ensuring the repeatable accuracy and stability of the tool position after each adjustment.

[0024] As a preferred embodiment, the mounting hole 210 is a waist-shaped slot. Compared to a circular hole, the waist-shaped slotted mounting hole 210 has greater axial freedom, allowing the toolholder 200 to slide continuously within a certain range without repeatedly removing the bolts 300. This design, combined with the multiple screw holes 120 on the sliding block 110, allows the operator to quickly slide and reposition the toolholder 200 without completely removing the fasteners, thereby achieving the dual effects of increasing adjustment efficiency and extending the tool adjustment range.

[0025] As a preferred embodiment, the thickness of each sliding block 110 decreases by 0.5-1mm at its highest point. The specific thickness values ​​were chosen based on engineering experience with typical machining allowances; the 0.5mm difference corresponds precisely to the transition between finishing and roughing. During boring, the highest tooth contacts the workpiece first, followed by the second-highest tooth. This allows the workpiece's inner hole to be machined 1.5-3mm deeper on one side in a single boring operation.

[0026] As a preferred solution, the three sliding blocks 110 have thicknesses of 43mm, 42.5mm, and 42mm, respectively. By precisely controlling the thickness differential of the sliding blocks 110, precise control of machining allowances can be achieved, making it particularly suitable for hard cutting applications using CBN tools. This design not only meets the requirements for varying cutting depths in step hole machining but also improves the consistency and repeatability of machining parameters. Furthermore, in specific applications, the thickness is not a fixed value; it is merely a representative value for one embodiment.

[0027] As a preferred embodiment, the toolholder body 200 is provided with scale lines 230. The toolholder body 200 also defines an adjustment hole 240 that communicates with the mounting hole 210. A fine-tuning screw 250 is positioned within the adjustment hole 240, abutting the bolt 300. With the fine-tuning screw 250 abutting the bolt 300, the position of the toolholder body 200 can be adjusted by rotating the fine-tuning screw 250. The presence of the scale lines 230 enhances the visualization and controllability of adjustments, reducing errors caused by human estimation. Furthermore, a reference point 260 is provided on the edge of the sliding tooth 220, enabling precise adjustment of the degree of precision through the coordination of the scale lines 230 and the reference point 260.

[0028] The above describes the present invention in detail. The description of the specific embodiments is intended only to facilitate understanding of the method and core concept of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A CBN step boring tool, characterized by: include A cutter disc (100), wherein the cutter disc (100) has at least three sliding blocks (110) arranged in a circumferential array; A tool holder body (200) is slidably arranged on the sliding block (110), at least two screw holes (120) are provided on the sliding block (110), a mounting hole (210) is opened on the tool holder body (200), and the tool holder body (200) fixes the sliding block (110) by means of a bolt (300) in cooperation with the mounting hole (210) and the screw hole (120).

2. The CBN step boring tool according to claim 1, characterized in that: The sliding block (110) is provided with a plurality of mounting teeth (130), and the bottom of the tool holder body (200) is provided with sliding teeth (220) engaged with the mounting teeth (130).

3. The CBN step boring tool according to claim 1, characterized in that: The mounting hole (210) is a waist groove type.

4. The CBN step boring tool according to claim 2, characterized in that: The thickness of the highest point of each sliding block (110) decreases by 0.5-1 mm.

5. The CBN step boring tool according to claim 1, characterized in that: The tool holder body (200) is provided with scale lines (230).

6. The CBN step boring tool according to claim 5, characterized in that: The tool holder body (200) is provided with an adjustment hole (240) which is in communication with the mounting hole (210); a fine-tuning screw (250) is provided in the adjustment hole (240); and the fine-tuning screw (250) is in contact with the bolt (300).

Images