JP3246600U - Collet unit with reliable fixing effect - Google Patents

Abstract

[Problem] To provide a collet unit with a reliable fixing effect that can simultaneously restrict the axial and circumferential movements of a cutting tool relative to a collet chuck. [Solution] The collet unit with a reliable fixing effect includes a hollow cylindrical collet chuck, a cutting tool insertable into the collet chuck, a positioning key arranged on the outer periphery of the cutting tool and having a protrusion, and a pressing member that can be coupled to the collet chuck, the inner circumferential surface of the collet chuck is provided with a guide groove extending in the axial direction and a positioning hole communicating with the guide groove, the positioning hole has an extension segment extending in the circumferential direction from the guide groove and a positioning segment extending in the axial direction from the extension segment, the protrusion can move along the guide groove and the extension segment to enter the positioning segment, and the pressing member, after being coupled to the collet chuck, presses the cutting tool in the axial direction to hold the protrusion within the positioning segment. [Selected Figure] Figure 1

Description

This invention relates to tooling for machine tools, and in particular to a collet unit that has a reliable fixing effect.

In conventional cutting tool drop prevention tool holders, a positioning key and a positioning hole are formed on the collet chuck and the cutting tool, respectively, to prevent the cutting tool from dropping out of the collet chuck. Specifically, the positioning key is provided in a protruding manner on the outer periphery of the cutting tool, and the positioning hole is provided in a recessed manner on the collet chuck so as to extend along the circumferential direction. When the cutting tool is inserted into the collet chuck, the positioning key enters the positioning hole along a guide groove extending in the axial direction in the collet chuck, and then, when the cutting tool is rotated relative to the collet chuck, the positioning key enters the positioning hole. In this way, the provision of a positioning hole extending in the circumferential direction limits the axial movement of the cutting tool relative to the collet chuck, thereby preventing the cutting tool from dropping out of the collet chuck.

However, in conventional cutting tool drop prevention tool holders, even after the positioning key has entered the positioning hole, the circumferential rotational movement of the cutting tool relative to the collet chuck is not restricted. This means that the cutting tool may rotate within the collet chuck due to vibration or impact, causing the positioning key to return from the positioning hole to the guide groove, which may result in the axial movement of the positioning key from the collet chuck and causing it to fall off. As such, conventional cutting tool drop prevention tool holders have the above problems and shortcomings and needed to be improved.

This invention was made in consideration of the shortcomings of the conventional technology, and aims to provide a collet unit that has a reliable fixing effect and can simultaneously limit the axial and circumferential movement of the cutting tool relative to the collet chuck.

In order to achieve the above object, the present invention proposes a collet unit having a reliable fixing effect, the collet unit having a reliable fixing effect includes a collet chuck, a cutting tool, a positioning key, and a pressing member,
the collet chuck is hollow and cylindrical, and includes a guide groove and a positioning hole communicating with the guide groove, the guide groove being formed on an inner peripheral surface of the collet chuck and extending from one end of the collet chuck along an axial direction D, the positioning hole having an extension segment extending from the guide groove along the circumferential direction of the collet chuck and a positioning segment extending from the extension segment along the axial direction of the collet chuck,
The cutting tool is axially insertable into the collet chuck;
the positioning key is disposed on the outer periphery of the cutting tool and has a protrusion, the protrusion being movable along the guide groove and the extension segment of the positioning hole to enter the positioning segment of the positioning hole;
The pressing member is connectable to the collet chuck, and after being connected to the collet chuck, the pressing member presses the cutting tool along the axial direction of the collet chuck, thereby holding the protrusion of the positioning key within the positioning segment of the positioning hole.

The positioning key includes an attachment base, the protrusion is formed on the attachment base, and the attachment base is attached to the outer periphery of the cutting tool by magnetic attraction.

The mounting base is characterized in that it comprises a base body and two magnets, the two magnets being installed on the base body.

The cutting tool is characterized by having an attachment recess formed on its outer periphery to accommodate the positioning key.

The pressing member includes a back cover and a positioning screw, the back cover is screwed onto one end of the collet chuck, a screw hole is formed on the back cover, and the positioning screw is screwed into the screw hole of the back cover and moves axially relative to the back cover to press the cutting tool against it.

According to the above technical features, the collet unit of the present invention, which has a reliable fixing effect, is provided with a positioning hole having an extension segment extending along the circumferential direction of the collet chuck and a positioning segment extending along the axial direction of the collet chuck, so that the protrusion of the positioning key arranged on the cutting tool enters the extension segment of the positioning hole from the guide groove of the collet unit and enters the positioning segment. Furthermore, the protrusion in the positioning segment is held immovable by the installation of a pressing member for pressing the cutting tool. This design makes it possible to simultaneously restrict the axial and circumferential movement of the cutting tool relative to the collet chuck, thereby improving the stability of the connection between the collet chuck and the cutting tool, and thus preventing the cutting tool from falling off the collet chuck.

FIG. 2 is a perspective exploded view of a preferred embodiment of the present invention; 4 is a side view illustrating the manner in which a cutting tool is inserted into a collet chuck in the preferred embodiment of the present invention; FIG. 4 is a side view illustrating the manner in which a cutting tool is inserted into a collet chuck in the preferred embodiment of the present invention; FIG. 4 is a side view illustrating the manner in which a cutting tool is inserted into a collet chuck in the preferred embodiment of the present invention; FIG. 4 is a cross-sectional view taken along line AA in FIG. 3. 5 is a cross-sectional view taken along line BB in FIG. 4. 1 is a side view illustrating a state in which a pressing member presses a cutting tool in a preferred embodiment of the present invention; FIG. FIG. 2 is a side cross-sectional view showing the assembled state of the preferred embodiment of the present invention; FIG. 2 is a side cross-sectional view showing the preferred embodiment of the present invention assembled to a tool holder;

In order to provide a deeper understanding of the technical features and practical effects of this invention, and to enable implementation according to the contents of the invention, a detailed description will be given below using preferred embodiments shown in the drawings.

As shown in Figs. 1 and 2, in a preferred embodiment of the present invention, a collet unit with a positive fixing effect comprises a collet chuck 10, a cutting tool 20, a positioning key 30 and a pressing member 40, the collet chuck 10 is used to hold the cutting tool 20 and can be attached to a tool holder together with the held cutting tool 20. The positioning key 30 is disposed on the outer periphery of the cutting tool 20 and enters the collet chuck 10. The pressing member 40 is coupled to the collet chuck 10 and is used to stabilize the assembled collet chuck 10 and cutting tool 20.

Next, the specific structure of each part will be described in detail. As shown in FIG. 1, the collet chuck 10 is a hollow cylindrical structure having an axial direction D and a circumferential direction C, and has an installation space 11 for inserting a cutting tool. The collet chuck 10 further includes an inner peripheral surface 12 surrounding the installation space 11, a guide groove 13 formed on the inner peripheral surface 12 and extending from one end of the collet chuck 10 along the axial direction D, and a positioning hole 14 extending from the guide groove 13 and formed to penetrate the annular wall of the collet chuck 10. The positioning hole 14 also has an extension segment 15 and a positioning segment 16, and the extension segment 15 is formed to extend from the guide groove 13 along the circumferential direction C of the collet chuck 10, and the positioning segment 16 is formed at one end of the extension segment 15 away from the guide groove 13 so as to extend along the axial direction D of the collet chuck 10. In addition, the positioning segment 16 here extends only a certain distance along the axial direction D of the collet chuck 10, that is, it may be slightly inclined with respect to the axis line of the collet chuck 10.

As shown in FIG. 1, the cutting tool 20 is divided into two major parts in the longitudinal direction: a cutting segment 21 and a mounting segment 22. The cutting segment 21 has a specific shape and is used to cut a workpiece. The mounting segment 22 is inserted and held in the mounting space 11 of the collet chuck 10. The positioning key 30 is disposed on the outer periphery of the cutting tool 20. Specifically, a mounting recess 23 that accommodates the positioning key 30 is provided on the outer periphery of the mounting segment 22 of the cutting tool 20. Furthermore, a cylindrical protrusion 31 is formed on the positioning key 30, and the protrusion 31 can move along the guide groove 13 and the positioning hole 14.

As shown in FIG. 1, the positioning key 30 in the preferred embodiment of the present invention includes a mounting base 32, the protrusion 31 is installed on the mounting base 32, and the mounting base 32 is magnetically attached to the outer periphery of the cutting tool 20. The specific structure of the mounting base 32 will be described below. The mounting base 32 includes a base body 33 and two magnets 34. The base body 33 has three holes arranged in a straight line, the protrusion 31 is fixed in the central hole, and the two magnets 34 are respectively fixed in the other two holes, that is, the protrusion 31 is located between the two magnets 34.

As shown in FIG. 1, the guide groove 13 extends axially from one end of the collet chuck 10, and the pressing member 40 is attached to the other end of the collet chuck 10 and abuts against the cutting tool 20 inserted into the collet chuck 10, thereby holding the positioning key 30 on the cutting tool 20 so that it is pressed into the positioning hole 14. The assembly procedure for the collet unit of the present invention will be described in detail below.

2 and 3, in the preferred embodiment of the collet unit with a reliable fixing effect, the mounting segment 22 of the cutting tool 20 is first inserted from one end of the collet chuck 10 along the axial direction D during assembly. The protrusion 31 of the positioning key 30 arranged on the outer periphery of the cutting tool 20 enters the guide groove 13 from one end of the collet chuck 10 and moves along the guide groove 13 as the cutting tool 20 is inserted in the axial direction. Next, as shown in FIGS. 3 to 6, when the protrusion 31 reaches the back of the guide groove 13, the collet chuck 10 and the cutting tool 20 are rotated relative to each other, and the protrusion 31 is inserted from the guide groove 13 into the extension segment 15 of the positioning hole 14. The extension segment 15 extends along the circumferential direction C of the inner circumferential surface 12 of the collet chuck 10, limiting the relative movement of the collet chuck 10 and the cutting tool 20 in the axial direction.

As described above, by rotating the collet chuck 10 and the cutting tool 20 relative to each other, the protrusion 31 moves from the guide groove 13 to the extension segment 15. Figures 4 and 6 show the state in which the protrusion 31 reaches the back of the extension segment 15, that is, the position furthest from the guide groove 13. Next, as shown in Figures 7 and 8, the protrusion 31 moves further from the extension segment 15 and is inserted into the positioning segment 16. At this time, the cutting tool 20 is pressed against the axial direction D of the collet chuck 10 via the pressing member 40, and the protrusion 31 of the positioning key 30 on the cutting tool 20 is held so as to be pressed into the positioning segment 16. This limits the axial movement of the cutting tool 20 and prevents the protrusion 31 from falling off the positioning segment 16.

Furthermore, as shown in Figures 1 and 7, the contour of the positioning segment 16 is arc-shaped and corresponds to the outer shape of the protrusion 31, and the connection portion between the positioning segment 16 and the extension segment 15 is designed to be wide enough for the protrusion 31 to pass through. With this design, the protrusion 31 smoothly enters and is held within the positioning segment 16, so that the rotation of the cutting tool 20 relative to the collet chuck 10 can be restricted, making it possible to restrict both the axial and circumferential movement of the cutting tool 20 relative to the collet chuck 10.

As shown in Figures 1 and 7, in a preferred embodiment of the present invention, the pressing member 40 includes a back cover 41 and a positioning screw 42, and the back cover 41 has a thread so that the back cover 41 can be screwed onto the inner surface of the collet chuck 10. In addition, a screw hole 411 for screwing the positioning screw 42 is formed in the center of the back cover 41. When in use, the back cover 41 is screwed onto the collet chuck 10 in advance, the cutting tool 20 is then attached by inserting it into the collet chuck 10, the protrusion 31 is placed into the positioning segment 16, and the positioning screw 42 is screwed into the screw hole 411 and screwed in until it abuts against the mounting segment 22 of the cutting tool 20 so as to move axially relative to the back cover 41. This holds the protrusion 31 in place in the positioning segment 16, limiting the axial movement of the cutting tool 20 relative to the collet chuck 10, thereby preventing the protrusion 31 from falling off the positioning segment 16.

The pressing member 40 in a preferred embodiment of the present invention has a positioning screw 42 that is screwed into the screw hole 411 of the back cover 41 and can move axially relative to the back cover 41, so that the protrusion 31 of the positioning key 30 can be held within the positioning segment 16 even if the attached cutting tools are of different lengths, making it possible to apply it to a wide variety of tools. Note that the pressing member 40 is not limited to the above configuration, and for example, the pressing member 40 may have a configuration in which a protrusion is provided on the back cover 41 without providing the positioning screw 42, and the protrusion is used to press the cutting tool 20.

According to the above technical features, the collet unit of the present invention, which has a reliable fixing effect, is provided with a positioning hole having an extension segment extending along the circumferential direction of the collet chuck and a positioning segment extending along the axial direction of the collet chuck, so that the protrusion of the positioning key arranged on the cutting tool enters the extension segment of the positioning hole from the guide groove of the collet unit and enters the positioning segment. Furthermore, the protrusion in the positioning segment is held immovable by the installation of a pressing member for pressing the cutting tool. This design makes it possible to simultaneously restrict the axial and circumferential movement of the cutting tool relative to the collet chuck, thereby improving the stability of the connection between the collet chuck and the cutting tool, and thus preventing the cutting tool from falling off the collet chuck.

Once the collet chuck 10 and cutting tool 20 according to the present invention are assembled, they are usually attached to a tool holder using a lock nut 60, or as shown in FIG. 9, a collet positioning key 70 may be provided on the outer periphery of the collet chuck 10 and attached to a tool holder 50 having a corresponding positioning hole. The collet positioning key 70 of the collet chuck 10 has the same or similar structure as the positioning key 30 arranged on the outer periphery of the cutting tool 20, and is fixed to the outer periphery of the collet chuck 10 by magnetic attraction. When the collet chuck 10 is inserted into the tool holder 50, the collet positioning key 70 enters the groove passage 51 on the inner periphery of the tool holder 50, and when the collet chuck 10 and the tool holder 50 are rotated relative to each other, the collet positioning key 70 enters the groove passage 51. This limits the relative movement of the collet chuck 10 and the tool holder 50 in the axial direction D, preventing the collet chuck 10 from falling off the tool holder 50.

The above description is merely a preferred embodiment of the present invention and does not limit the present invention in any way. Although the present invention has been disclosed above with a relatively preferred embodiment, this does not limit the present invention, and any simple modifications, changes and modifications made to the above embodiment by anyone skilled in the art based on the technical essence of the present invention, within the scope of the technical concept of the present invention, are still within the scope of the technical concept of the present invention.

10 collet chuck 11 mounting space 12 inner peripheral surface 13 guide groove 14 positioning hole 15 extension segment 16 positioning segment 20 cutting tool 21 cutting segment 22 mounting segment 23 mounting recess 30 positioning key 31 protrusion 32 mounting base 33 base body 34 magnet 40 pressing member 41 back cover 411 screw hole 42 positioning screw 50 tool holder 51 groove passage 60 lock nut 70 collet positioning key C circumferential direction D axial direction

Claims (5)

A collet unit having a reliable fixing effect, comprising a collet chuck, a cutting tool, a positioning key, and a pressing member;
the collet chuck is hollow and cylindrical, and includes a guide groove and a positioning hole communicating with the guide groove, the guide groove being formed on an inner peripheral surface of the collet chuck and extending from one end of the collet chuck along an axial direction, the positioning hole having an extension segment extending from the guide groove along a circumferential direction of the collet chuck and a positioning segment extending from the extension segment along the axial direction of the collet chuck,
The cutting tool is axially insertable into the collet chuck;
the positioning key is disposed on the outer periphery of the cutting tool and has a protrusion, the protrusion being movable along the guide groove and the extension segment of the positioning hole to enter the positioning segment of the positioning hole;
A collet unit having a reliable fixing effect, characterized in that the pressing member can be connected to the collet chuck, and after being connected to the collet chuck, the pressing member presses the cutting tool along the axial direction of the collet chuck, thereby holding the protrusion of the positioning key within the positioning segment of the positioning hole. A collet unit with a secure fixing effect as described in claim 1, characterized in that the positioning key includes an attachment base, the protrusion is formed on the attachment base, and the attachment base is attached to the outer periphery of the cutting tool by magnetic attraction. A collet unit with a secure fixing effect as described in claim 2, characterized in that the mounting base comprises a base body and two magnets, the two magnets being installed on the base body. A collet unit having a reliable fixing effect as described in any one of claims 1 to 3, characterized in that a mounting recess for accommodating the positioning key is formed on the outer periphery of the cutting tool. A collet unit having a reliable fixing effect as described in any one of claims 1 to 3, characterized in that the pressing member includes a back cover and a positioning screw, the back cover is screwed onto one end of the collet chuck, a screw hole is formed on the back cover, the positioning screw is screwed into the screw hole of the back cover, and moves axially relative to the back cover to press the cutting tool.

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