Multi-step expanding and reaming integrated composite cutter

Abstract

The utility model discloses a multi-step expanding and reaming integrated composite cutter which comprises a handle portion, a reamer section and an expanding cutter section are sequentially arranged at the working end of the handle portion, the longitudinal section of a cutting edge of the expanding cutter section is in a step shape, the diameter of each layer of cutting edge is gradually increased from top to bottom, and the handle portion, the reamer section and the expanding cutter section jointly form an expanding cutter body. An end part cutting edge is arranged at the end part of the working end of the expanding reamer body, and a chip groove is formed in the working end of the outer wall of the expanding reamer body. The problem that long-strip-shaped and large-sheet-shaped metal chippings are generated during metal machining of an inner cavity of an existing part is solved.

Description

Technical Field

[0001] This utility model relates to the field of reamers, and in particular to a multi-step reamer integrated composite tool. Background Technology

[0002] When machining parts with particularly complex internal cavities, long, large pieces of metal often fall into these cavities. During cleaning, these metal fragments frequently become stuck between the upper and lower layers of the cavity or in dead corners, unable to be removed. Later in the product's lifespan, these stuck metal fragments loosen, causing blockages in the cooling system, leading to cooling system failure and ultimately, the entire product becoming unusable. For example, engine cylinder heads often suffer from blockages in the thermostat and even cooler pipes due to residual metal fragments, resulting in engine failure and significant losses for the company. Meanwhile, with the rapid development of advanced manufacturing technology in China in recent years, many parts are now machined using CNC horizontal machining centers to ensure product precision. If a reaming and boring tool could be combined into a single composite tool, not only could one tool be reduced, but also the tool change time on the machine tool could be decreased, significantly improving production efficiency. How to solve the problem of residual metal fragments in the internal cavities of parts and improve machining efficiency has been a long-standing challenge for engineering technicians. Utility Model Content

[0003] The purpose of this utility model is to provide a multi-step expanding and reaming integrated composite tool to solve the problem of long, large, and sheet-like metal chips generated during the machining of internal cavities of parts. To solve the above-mentioned technical problems, this utility model adopts the following technical solution:

[0004] A multi-step expanding and reaming integrated composite tool includes a shank, the working end of which is provided with a reamer section and an expanding section in sequence. The longitudinal section of the cutting edge of the expanding section is stepped, and the diameter of each layer of cutting edge gradually increases from top to bottom. The shank, the reamer section and the expanding section together constitute the expanding and reaming tool body. The working end of the expanding and reaming tool body is provided with an end cutting edge, and the working end of the outer wall of the expanding and reaming tool body is provided with a chip removal groove.

[0005] The reaming section adopts a stepped diameter design, which effectively avoids the generation of long strips and large pieces of metal chips. At the same time, it combines reaming and boring with a single tool, combining the work that previously required two tools into one tool, greatly improving production efficiency.

[0006] As a further preferred embodiment of this utility model, the cutting edge of the expanding section is divided into five layers, with each layer of cutting edges being D1, D2, D3, D4 and D5 from top to bottom. The diameters of D1, D2 and D3 differ by 0.6 mm, and the diameters of D4 and D5 differ by 0.2 mm. The diameter of the widest layer of the expanding section cutting edge is 0.2 mm smaller than the diameter of the reamer section cutting edge.

[0007] As a further preferred embodiment of this utility model, the center of the reamer body is provided with an internal cooling hole, which communicates with the branch holes connected to the cutting edges of the reamer section and the chip removal groove.

[0008] Internal cooling holes are provided in the spiral grooves of both the reamer and the blade expansion section, which is beneficial for chip removal, cooling and lubrication of the cutting edge.

[0009] As a further preferred embodiment of this utility model, the end cutting edge has three parts, and the end cutting edge extends 0.3-0.4 mm beyond the center.

[0010] As a further preferred embodiment of this utility model, the chip removal groove adopts a groove design with a large spiral and unequal division.

[0011] The design of the large spiral unequal chip removal groove allows the metal chips to rotate, which facilitates the collision of the metal chips and achieves the purpose of chip breaking and removal.

[0012] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0013] 1. By employing multi-stage layered cutting technology, the generation of long, large, and sheet-like metal chips is eliminated, resulting in finer, discontinuous metal chips that are much easier to clean. This improves the cleanliness and particle size of the inner cavity, reducing the likelihood of product scrap caused by metal chips falling into the inner cavity and clogging the water channels. Furthermore, by combining the expander and reamer into a single tool, one tool is eliminated, saving 9 seconds of tool change time and increasing overall processing efficiency by 1.2 times – a very effective result.

[0014] 2. Internal cooling holes are provided in the spiral grooves of both the reamer and the blade expansion section, which is beneficial for chip removal, cooling and lubrication of the cutting edge.

[0015] 3. The design of the large spiral unequal chip removal groove allows the metal chips to rotate, which is conducive to the collision of metal chips, thereby achieving the purpose of chip breaking and chip removal.

[0016] 4. The blade surface has been polished, making it sharper and reducing metal shavings adhesion, allowing them to be discharged smoothly. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the utility model.

[0018] Figure 2 This is an enlarged view of the layout of the multi-step outer diameter of the blade reamer section of the utility model.

[0019] Figure 3 This is a schematic diagram of the side cutting edge structure of the blade reamer section of a utility model.

[0020] Figure 4This is a schematic diagram of the side cutting edge structure of the reamer section of the utility model.

[0021] Figure 5 for Figure 1 End face view. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Specific Implementation Example 1:

[0029] Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 A multi-step reaming and expanding composite tool is shown, including a shank 1. The working end of the shank 1 is provided with a reamer section 5 and an expanding section 4 in sequence. The longitudinal section of the cutting edge of the expanding section is stepped, and the diameter of each layer of cutting edge gradually increases from top to bottom. The shank 1, the reamer section 5 and the expanding section 4 together constitute the reaming and expanding tool body. The working end of the reaming and expanding tool body is provided with an end cutting edge, and the working end of the outer wall of the reaming and expanding tool body is provided with a chip removal groove 3.

[0030] The reaming section adopts a stepped diameter design, which effectively avoids the generation of long strips and large pieces of metal chips. At the same time, it combines reaming and boring with a single tool, combining the work that previously required two tools into one tool, greatly improving production efficiency. Specific Implementation Example 2:

[0032] This embodiment is based on specific embodiment 1, with the blade widening section 4 having five layers of cutting edges. From top to bottom, each layer of cutting edges is labeled D1, D2, D3, D4, and D5. The diameters of D1, D2, and D3 differ by 0.6 mm, and the diameters of D4 and D5 differ by 0.2 mm. The diameter of the widest layer of cutting edges in the blade widening section 4 is 0.2 mm smaller than the diameter of the cutting edge in the reamer section 5. Specific Implementation Example 3:

[0034] This embodiment further describes the reamer body based on specific embodiment 1. The reamer body has an internal cooling hole 2 at its center, and the internal cooling hole 2 is connected to the branch hole at the cutting edge of the reamer section 4 and the chip removal groove 3.

[0035] Internal cooling holes are provided in the spiral grooves of both the reamer and the blade expansion section, which is beneficial for chip removal, cooling and lubrication of the cutting edge. Specific Implementation Example 4:

[0037] This embodiment further describes the end cutting edge based on specific embodiment 1. There are three end cutting edges, and the end cutting edges pass through the center by 0.3-0.4 mm. Specific Implementation Example 5:

[0039] This embodiment further describes the chip removal groove 3 based on specific embodiment 1. The chip removal groove 3 adopts a groove design with large spiral unequal division.

[0040] The design of the large spiral unequal chip removal groove allows the metal chips to rotate, which facilitates the collision of the metal chips and achieves the purpose of chip breaking and removal.

[0041] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-step expanding and reaming integrated composite cutter, characterized in that: The tool includes a shank (1), and the working end of the shank (1) is provided with a reamer section (5) and a reamer section (4) in sequence. The longitudinal section of the cutting edge of the reamer section is stepped, and the diameter of each layer of cutting edge gradually increases from top to bottom. The shank (1), the reamer section (5) and the reamer section (4) together constitute the reamer body. The working end of the reamer body is provided with an end cutting edge. The working end of the outer wall of the reamer body is provided with a chip removal groove (3). The cutting edge of the reamer section (4) is divided into five layers. From top to bottom, each layer of cutting edge is D1, D2, D3, D4 and D5 in sequence. The diameters of D1, D2 and D3 differ by 0.6 mm, and the diameters of D4 and D5 differ by 0.2 mm. The diameter of the widest layer of the reamer section (4) is 0.2 mm smaller than the diameter of the cutting edge of the reamer section (5). The chip removal groove (3) adopts a large spiral unequal division groove design.

2. The multi-step expanding and reaming integrated composite blade according to claim 1, characterized in that: The center of the reamer body is provided with an internal cooling hole (2), which is connected to the branch hole at the cutting edge of the reamer section (4) and the chip removal groove (3).

3. The multi-step expanding and reaming integrated composite cutter according to claim 1, characterized in that: The end cutting edge has three edges, and the end cutting edge passes through the center by 0.3-0.4 mm.

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