A spline tool for suppressing burr generation

Abstract

The utility model discloses a kind of plug key knives of inhibiting burr generation, including tool bar, the head of tool bar is provided with tool bit, protruding cutting edge is provided on the outside wall of tool bit, and cutting edge extends to the end face of tool bit along axial direction, the outside wall of cutting edge is main cutting edge, the width of main cutting edge is matched with the width of keyway, and the thickness of main cutting edge gradually reduces along the extension direction of tool bar, the side of cutting edge is avoidance side edge, the section of avoidance side edge is inverted conical structure, chamfer cutting edge is arranged in the junction of cutting edge and tool bit, the section of chamfer cutting edge is conical structure, and there is transition R section between chamfer cutting edge and avoidance side edge.The beneficial effects of the utility model are: setting avoidance side edge, reduce the contact area of cutting process, reduce tool load, and also set transition R section and chamfer cutting edge, can support main cutting edge, contain key depth tolerance change in actual processing, and after processing, burr can be inhibited.

Description

Technical Field

[0001] This utility model relates to machining tools for keyways, and in particular to a keyway insert tool that suppresses burr formation. Background Technology

[0002] Keyways, as a conventional structure for transmitting torque, are typically machined using plunge milling: the cross-section of the key serves as the cutting surface for the tool, which reciprocates vertically along the key, forming the key in radial layers. For example... Figure 6 As shown, at the junction of the two sides of the key and the outer plane, some of the residue after the cutting edge is squeezed remains on the substrate, which is the burr. Existing methods for removal usually involve using sharper tools and harder materials to reduce burr residue.

[0003] Cutting burrs are a normal and common phenomenon in metal cutting processes. The mechanism is that when the cutting tool cuts the substrate, the cutting edge applies pressure to the substrate. When this pressure exceeds the material's shear limit, plastic deformation occurs, leading to separation. When the tool reaches the substrate edge, there is insufficient substrate support / counterforce, resulting in plastic displacement at the edge to absorb some of the pressure. This deformation zone is not within the cutting surface but remains at the substrate edge, forming a cutting burr. Therefore, redesigning the support structure to provide better support can suppress burr formation. This is verified through simulation analysis and actual machining. a) Triangular support: When the apex angle is between 30° and 60°, the burr size increases with the increase of the apex angle; b) The arc support has higher rigidity than the triangular support and is the most effective at suppressing burrs. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a key insert tool that suppresses burr generation.

[0005] The objective of this utility model is achieved through the following technical solution: a key insert tool for suppressing burr generation, comprising a tool shank, a tool head at the head of the tool shank, a protruding cutting edge on the outer wall of the tool head, the cutting edge extending axially to the end face of the tool head, the outer wall of the cutting edge being the main cutting edge, the width of the main cutting edge matching the width of the keyway, and the thickness of the main cutting edge gradually decreasing along the extension direction of the tool shank, the side of the cutting edge being an avoidance side edge, the cross-section of the avoidance side edge being an inverted conical structure, a chamfered cutting edge being provided at the junction of the cutting edge and the tool head, the cross-section of the chamfered cutting edge being a conical structure, and a transition R segment between the chamfered cutting edge and the avoidance side edge.

[0006] Optionally, there are two blades, and the two blades are arranged symmetrically.

[0007] Optionally, the end face of the cutter head is provided with a V-groove, and the groove wall of the V-groove extends to the main cutting edge.

[0008] Optionally, the included angle between the main cutting edge and the avoidance side edge is 85°~87°.

[0009] Optionally, the cross-section of the tool holder is a waist-shaped column structure.

[0010] The present invention has the following advantages: The key insert tool of the present invention is provided with a clearance side edge, which reduces the contact area during the cutting process and reduces the tool load. It is also provided with a transition R section and a chamfered cutting edge, which can support the main cutting edge, accommodate the changes in key depth tolerance during actual machining, and suppress the generation of burrs after machining. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of a key cutting tool used in machining keyways. Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the V-groove structure; Figure 5 Schematic diagram of the structure of the transition R segment and the starting segment of the chamfered cutting edge cutting the side of the keyway. Figure 6 A schematic diagram illustrating the mechanism of burr generation when machining keyways with existing cutting tools; In the diagram, 1-tool holder, 2-tool head, 3-cutting edge, 31-main cutting edge, 32-avoiding side edge, 33-transition R section, 34-chamfering cutting edge. Detailed Implementation

[0012] 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 generally be arranged and designed in various different configurations.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] like Figure 1 As shown, a key insert tool for suppressing burr generation includes a tool shank 1. In this embodiment, the tool shank 1 has a cross-section of a waist-shaped column structure, meaning it has two planes to facilitate clamping. A cutting head 2 is provided at the head of the tool shank 1. In this embodiment, the cutting head 2 is also rod-shaped, and its size is smaller than that of the tool shank 1. A protruding cutting edge 3 is provided on the outer wall of the cutting head 2, extending axially to the end face of the cutting head 2. The outer wall of the cutting edge 3 is the main cutting edge 31. Figure 2 and Figure 3As shown, the width of the main cutting edge 31 matches the width of the keyway, and the thickness of the main cutting edge 31 gradually decreases along the extension direction of the tool holder 1. The side of the cutting edge 3 is a clearance side edge 32, and the cross-section of the clearance side edge 32 is an inverted conical structure. A chamfered cutting edge 34 is provided at the junction of the cutting edge 3 and the tool head 2. The cross-section of the chamfered cutting edge is a conical structure. There is a transition R section 33 between the chamfered cutting edge 34 and the clearance side edge 32. In this embodiment, the included angle α between the main cutting edge 31 and the clearance side edge 32 is 85°~87°. Therefore, during the cutting process, the contact area of ​​the cutting edge 3 can be reduced, thereby reducing the tool load. Figure 5 As shown, the transition R segment 33 is used to connect the avoidance side edge 32 and the chamfered cutting edge 34, to round the starting section of the side of the keyway, and to support the avoidance side edge 32, while the chamfered cutting edge 34 is used to support the main cutting edge 31 of the cutting edge 3, and to accommodate the changes in key depth tolerance during actual machining.

[0019] In this embodiment, as Figure 1 As shown, there are two cutting edges 3, and the two cutting edges 3 are symmetrically arranged. Since the product to be processed has multiple keyways, after the cutting edges 3 are two, the cutting edges 3 can be used alternately, thereby improving the service life of the key-fitting tool.

[0020] In this embodiment, as Figure 4 As shown, the end face of the cutter head 2 is provided with a V-groove, and the groove wall of the V-groove extends to the main cutting edge 31. That is to say, during use, the main cutting edge 31 first contacts the rough-machined keyway. Moreover, during the machining process, the cutting chips can also move towards the middle of the cutter head 2 under the guidance of the V-groove, thereby reducing the impact of chips on the cutting edge 3. Furthermore, when machining to the bottom of the keyway, a space for accommodating chips is formed between the V-groove and the bottom of the hole in the workpiece, thereby preventing chips from pressing against the end face of the cutter head 2. Therefore, this keyway cutter can machine to the bottom of the keyway, ensuring the reliability of keyway machining.

[0021] In this embodiment, the transition R segment 33 and the chamfered cutting edge 34 will chamfer the edge of the substrate. When the bond depth changes, the actual cutting edge will also change between the transition R segment 33 and the chamfered cutting edge 34. Compared with the existing right-angled cutting edge 3, its support is significantly enhanced.

[0022] 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 key inserter that suppresses burr generation, characterized in that: The tool includes a tool holder, a tool head at the head of the tool holder, a protruding cutting edge on the outer wall of the tool head, and the cutting edge extending axially to the end face of the tool head. The outer wall of the cutting edge is the main cutting edge, the width of which matches the width of the keyway, and the thickness of which gradually decreases along the extension direction of the tool holder. The side of the cutting edge is an avoidance side edge with an inverted conical cross-section. A chamfered cutting edge is provided at the junction of the cutting edge and the tool head, and the chamfered cutting edge has a conical cross-section. There is a transition R segment between the chamfered cutting edge and the avoidance side edge.

2. The key inserter for suppressing burr generation according to claim 1, characterized in that: The blade has two blades, which are arranged symmetrically.

3. A key inserter for suppressing burr generation according to claim 2, characterized in that: The end face of the cutter head is provided with a V-shaped groove, and the groove wall of the V-shaped groove extends to the main cutting edge.

4. A key inserter for suppressing burr generation according to claim 1, characterized in that: The angle between the main cutting edge and the avoidance side edge is 85°~87°.

5. A key inserter for suppressing burr generation according to claim 1, characterized in that: The cross-section of the tool holder is a waist-shaped column structure.

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