Knife handle fully wrapped by collet chuck

Abstract

The utility model relates to a cutter handle with a fully-wrapped collet chuck. The cutter handle comprises a cutter handle body, the collet chuck and a nut. One end of the cutter handle body is suitable for being connected with a machine tool, an inner hole is formed in the other end of the cutter handle body and arranged in the axial direction of the cutter handle body, and the collet is installed in the inner hole. A clamping hole is formed in the center of the collet chuck, the clamping hole and the inner hole are coaxially arranged, and the collet chuck is connected with a tool in an inserted mode through the clamping hole. The collet chuck comprises a lower conical part and an upper conical part which are connected, and the lower conical part is located in the inner hole of the cutter handle body; wherein the outer contour of the lower conical part is matched with the inner hole, and when the collet chuck is installed in the inner hole, the cutter handle body wraps the lower conical part in the whole circumferential direction; the inner hole is deepened, and the depth of the inner hole is larger than or equal to the length of the lower conical part, so that the lower conical part of the clamping cylinder is completely wrapped, deflection of a cutter is reduced, and the precision of repeated cutter locking is ensured.

Description

Technical Field

[0001] This application relates to the field of machining tool technology, and in particular to a tool holder with a fully enclosed collet. Background Technology

[0002] In the field of machining, the tool holder, as the core component connecting the machine tool spindle and the cutting tool, directly affects the machining quality and efficiency due to its clamping accuracy and rigidity. Traditional ER collet tool holders typically consist of a tool holder body, a collet, and a nut. By tightening the nut, the lower cone of the collet and the inner cone surface of the tool holder body are made to form an interference fit, thereby clamping the tool. However, the inner hole depth of the existing tool holder body is less than the length of the lower cone of the collet. Due to the limitation of the inner hole depth, the lower cone of the collet cannot fully contact the inner hole of the tool holder body. As a result, when the collet is subjected to the locking force of the nut, the clamping hole of the collet will deform irregularly, which will cause the tool to wobble easily during operation. Summary of the Invention

[0003] In view of this, this application proposes a tool holder with a fully enclosed collet, comprising: a tool holder body, a collet, and a nut;

[0004] One end of the tool holder body is suitable for connection with a machine tool, and the other end of the tool holder body has an inner hole, which is set along the axial direction of the tool holder body. The collet is installed in the inner hole. The center of the collet has a clamping hole, which is coaxial with the inner hole. The collet inserts the tool through the clamping hole.

[0005] The collet includes a lower cone and an upper cone connected together, with the lower cone located inside the inner hole of the tool holder body;

[0006] The outer contour of the lower cone matches the inner hole, which is suitable for the tool holder body to fully cover the lower cone when the collet is installed in the inner hole.

[0007] The nut is fitted onto the upper cone and connected to the tool holder body.

[0008] In one possible implementation, the ratio of the inner hole depth to the length of the lower cone is 1.2–1.5.

[0009] In one possible implementation, both the lower cone and the inner hole have trapezoidal cross-sections, and the inner hole has the same cone angle as the lower cone.

[0010] In one possible implementation, the inner hole cone angle ranges from 7.9° to 8.1°.

[0011] In one possible implementation, a slot is provided at one end of the upper cone near the lower cone; a buckle is provided on the inner wall of the nut, and the buckle matches the slot; the buckle is embedded in the slot.

[0012] Beneficial effects of this application

[0013] When the nut is tightened, it generates an axial force that is transmitted to the contact surface between the lower cone and the inner hole. The inner hole decomposes the axial force generated by the nut into a component perpendicular to the cone surface of the lower cone, thereby causing the lower cone to undergo radial contraction deformation. Figure 2 , Figure 3 As shown, compared with traditional tool holders, the lower cone of the collet cannot fully contact the inner hole due to insufficient inner hole depth. This results in the lower cone's deformation direction not being fully constrained when the collet deforms, leading to irregular deformation of the collet's clamping hole. In this application, by deepening the inner hole to a depth greater than or equal to the length of the lower cone, the lower cone of the collet is fully covered. When the collet deforms radially, the full-coverage design ensures that the lower cone is evenly stressed, causing the collet to deform only in the direction perpendicular to the center line of the inner hole. This makes the collet's clamping hole nearly circular. The near-circular deformation of the clamping hole makes the force on the tool more uniform, increases the friction between the collet and the tool, and prevents the tool from wobbling due to insufficient or excessive local clamping force. This improves the collet's clamping force, reduces tool wobbling, and ensures the accuracy of repeated tool locking.

[0014] Other features and aspects of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0015] The accompanying drawings, which are included in and form part of this specification, illustrate exemplary embodiments, features, and aspects of this application together with the specification and serve to explain the principles of this application.

[0016] Figure 1 This diagram shows the main structure of the tool holder with full collet coverage according to this application;

[0017] Figure 2 Show Figure 1 A sectional view;

[0018] Figure 3 Show Figure 2 A magnified view of a portion of the image;

[0019] Figure 4 A cross-sectional view of the tool holder fully covered by the collet of this application is shown;

[0020] Figure 5 Showing the front view of the collet;

[0021] Figure 6 A cross-sectional view of the prior art tool holder body and collet is shown.

[0022] Tool holder body—100; Inner hole—101; Collet—200; Lower taper—210; Upper taper—220; Slot—230; Nut—300. Detailed Implementation

[0023] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0024] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model or 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.

[0025] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0027] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented without certain specific details. In some instances, methods, means, components, and circuits well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0028] This application proposes a tool holder with a fully enclosed collet, such as... Figures 1 to 5As shown, the tool holder includes: a tool holder body 100, a collet 200, and a nut 300; one end of the tool holder body 100 is adapted to be connected to a machine tool, and the other end of the tool holder body 100 has an inner hole 101, which is arranged along the axial direction of the tool holder body 100. The collet 200 is installed in the inner hole 101; the collet 200 has a clamping hole at its center, which is coaxial with the inner hole 101, and the collet 200 inserts a tool through the clamping hole; the collet 200 includes a lower tapered portion 210 and an upper tapered portion 220 connected to each other; the lower tapered portion 210 is located inside the inner hole 101 of the tool holder body 100, wherein the outer contour of the lower tapered portion 210 matches the inner hole 101, which is suitable for the tool holder body 100 to fully cover the lower tapered portion 210 circumferentially when the collet 200 is installed in the inner hole 101; the nut 300 is sleeved on the upper tapered portion 220 and connected to the tool holder body 100.

[0029] It should be noted that the tool holder body 100 is used to mount the tool on the machine tool, and the inner hole 101 is used to provide a mounting positioning reference for the collet 200, ensuring the relative position of the collet 200 and the tool holder body 100 is stable, avoiding tool wobble caused by installation deviation of the collet 200, and improving machining accuracy. The axial design of the inner hole 101 ensures that the collet 200 and the tool holder body 100 are installed coaxially. The collet 200 clamps the tool through the clamping hole, thereby mounting the tool on the tool holder body 100. The coaxial design of the clamping hole and the inner hole 101 ensures that the tool, collet 200, and tool holder body 100 are in a coaxial state after installation, thus avoiding deviation or wobbling of the tool during machining. The outer wall of the tool holder body 100 has an external thread that matches the nut 300. The tool holder body 100 is threadedly connected to the nut 300, which is fitted onto the upper tapered portion 220. The threaded connection between the nut 300 and the tool holder body 100 generates a locking force, thereby locking the collet 200. In the inner hole 101, the lower cone portion 210 is installed, and the outer wall of the lower cone portion 210 is tightly fitted to the inner hole 101. The tool holder body 100 fully covers the lower cone portion 210 circumferentially by increasing the depth of the inner hole 101. By designing the depth of the inner hole 101 to be greater than or equal to the length of the lower cone portion 210, the tool holder body 100 can fully cover the lower cone portion 210 circumferentially when it is installed in the inner hole 101, thereby increasing the tool's strength. The contact area between the shank body 100 and the collet 200, through the rotation of the nut 300, the upper conical part 220 uniformly converts the locking force generated by the nut 300 into the radial clamping force of the lower conical part 210, thereby ensuring the stable clamping of the tool by the collet 200. At the same time, the full-coverage setting effectively restricts the deformation direction of the collet 200 under force, so that the inner hole 101 of the collet 200 is close to a full circle when clamping the tool, thereby ensuring that the tool is not easy to loosen or wobble when rotating at high speed or subjected to large cutting forces.

[0030] When the nut 300 is tightened, it generates an axial force that is transmitted to the contact surface between the lower conical portion 210 and the inner hole 101. The inner hole 101 decomposes the axial force generated by the nut 300 into a component perpendicular to the conical surface of the lower conical portion 210, thereby causing the lower conical portion 210 to undergo radial contraction deformation. Figure 3 , Figure 6 As shown, compared with conventional tool holders, due to the insufficient depth of the inner hole 101 of conventional tool holders, the lower cone of the collet 200 cannot fully contact the inner hole 101. This results in the lower cone 210 of the collet 200 not being constrained in all directions when deformed, leading to irregular deformation of the collet's clamping hole. In this application, by deepening the inner hole 101 to a depth greater than or equal to the length of the lower cone 210, full coverage of the lower cone 210 of the collet is achieved. When the collet 200 undergoes radial contraction deformation... The fully enclosed design ensures that the lower cone 210 is subjected to uniform force, which in turn causes the collet 200 to deform only in the direction perpendicular to the center line of the inner hole 101. This results in the collet 200's clamping hole deforming into a near-circular shape. This near-circular deformation makes the force on the tool in the clamping hole more uniform, increases the friction between the collet 200 and the tool, and prevents the tool from deflecting due to insufficient or excessive clamping force in certain areas. This improves the clamping force of the collet 200, reduces tool deflection, and ensures the accuracy of repeated tool locking.

[0031] Furthermore, the collet 200 has deformation capability, and preferably, the collet 200 adopts the ER collet of the existing model.

[0032] In one possible implementation, such as Figure 4 , Figure 5 As shown, the ratio of the depth L1 of the inner hole 101 to the length L2 of the clamping part is 1.2–1.5. It should be noted that this appropriate ratio range ensures that the lower tapered portion 210 is completely covered by the inner hole 101 of the tool holder body 100, ensuring that the collet 200 is subjected to uniform force. This allows the collet 200 to effectively deform in the direction perpendicular to the center line of the inner hole 101, ensuring that the clamping hole deforms close to a full circle, thus improving the stability and accuracy of tool clamping.

[0033] In one possible implementation, such as Figure 2 , Figure 3As shown, the lower tapered portion 210 and the inner hole 101 have trapezoidal cross-sections, and the inner hole 101 and the lower tapered portion 210 have the same taper angle. It should be noted that the width of the inner hole 101 gradually decreases from the end of the tool holder body 100 towards the machine tool. The lower tapered portion 210 is located within the inner hole 101 of the tool holder body 100. The identical taper angle ensures a tight fit between the lower tapered portion 210 of the collet 200 and the inner hole 101, and allows for uniform force transmission. When the collet 200 is subjected to external force, the pressure on all parts of the lower tapered portion 210 is consistent, avoiding uneven force distribution and localized stress concentration. The situation ensures that the collet 200 can effectively deform in the direction perpendicular to the center line of the inner hole 101, thereby ensuring that the clamping hole is deformed to be close to a full circle, and improving the stability of the collet 200 in clamping the tool; wherein, the cone angle of the lower cone 210 specifically refers to the angle between the inclined side of the lower cone 210 in the cross section and the central axis of the lower cone 210; the included angle of the inner hole 101 specifically refers to the angle between the inclined side of the inner hole 101 in the cross section and the central axis of the inner hole 101.

[0034] In one possible implementation, the cone angle of the inner hole 101 ranges from 7.9° to 8.1°; preferably, the cone angle of the inner hole 101 is 8°.

[0035] In one possible implementation, such as Figure 2 , Figure 3 , Figure 5 As shown, a groove 230 is provided at one end of the upper conical portion 220 near the lower conical portion 210. A buckle is provided on the inner wall of the nut 300, and the buckle matches the groove 230; the buckle is embedded in the groove 230. It should be noted that the matching design of the groove 230 and the buckle provides a clear positioning reference for the installation of the nut 300 and the collet 200. When the nut 300 is placed on the upper conical portion 220 of the collet 200, the buckle on the inner wall of the nut 300 is embedded in the groove 230 on the upper conical portion 220, which can effectively prevent relative rotation or axial displacement between the nut 300 and the collet 200. The cooperation between the groove 230 and the buckle can increase the connection strength between the nut 300 and the collet 200, so that the nut 300 and the collet 200 can work together when subjected to external forces, ensuring the stability of the tool during operation. Moreover, the design structure of the buckle and the groove 230 is simple and easy to operate.

[0036] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A collet fully covered shank characterized by, The utility model relates to a tool holder, which comprises: a tool holder body, a chuck and a nut; one end of the tool holder body is adapted to be connected with a machine tool, the other end of the tool holder body is provided with an inner hole, the inner hole is arranged along the axial direction of the tool holder body, and the chuck is installed in the inner hole; a clamping hole is arranged in the center of the chuck, and the clamping hole is coaxially arranged with the inner hole, and the chuck is inserted with a tool through the clamping hole; the chuck comprises a lower taper part and an upper taper part connected with each other, and the lower taper part is located inside the inner hole of the tool holder body; wherein the outer contour of the lower taper part matches the inner hole, and the tool holder body is adapted to wrap the lower taper part around when the chuck is installed in the inner hole; the nut is sleeved on the upper taper part and connected with the tool holder body.

2. The collet overmolded tool holder of claim 1, wherein, The ratio of the depth of the inner hole to the length of the lower taper part is 1.2-1.

5.

3. The collet overmolded shank of claim 1 wherein, The cross section of the lower taper part and the inner hole is trapezoidal structure, and the taper angle of the inner hole and the lower taper part is the same.

4. The collet overmolded tool holder of claim 3, wherein, The value range of the inner hole taper angle is 7.9-8.1 degrees.

5. The collet overmolded shank of claim 1 wherein, An end of the upper taper part near the lower taper part is provided with a clamping groove; a clamping buckle is annularly arranged on the inner wall of the nut, and the clamping buckle matches the clamping groove; the clamping buckle is embedded in the clamping groove.

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