CNC cutter handle

Abstract

The utility model provides a CNC cutter handle, and belongs to the technical field of numerical control machine tools. The CNC cutter handle comprises a cutter handle main body, a collet chuck, a locking cap and an annular locking piece, a circle of first annular bulge is formed on the circumferential side wall of one end of the knife handle main body; a circle of third annular bulge is formed on the circumferential side wall of the outer side of the open end of the locking cap; the cross section of the annular lock is in a U shape, the annular lock clamps the third annular protrusion and the first annular protrusion in a matched mode, the locking cap and the cutter handle body abut against the collet, and therefore a cutter is clamped. The third annular protrusion on the locking cap, the first annular protrusion on the cutter handle body and the annular locking piece are matched to enable the locking cap and the cutter handle body to abut against the collet, the cutter is fixed, the operation process is simpler, and the problem of reverse loosening caused by threaded connection does not exist.

Description

Technical Field

[0001] This utility model relates to the field of CNC machine tool technology, and in particular to a CNC tool holder. Background Technology

[0002] CNC tool holders are connecting components between the mechanical spindle of a CNC machine tool and the cutting tool and other accessory tools.

[0003] Chinese utility model (title: "An Adjustable Knife Handle", announcement number: CN206536042U, announcement date: 2017-10-03) discloses an adjustable knife handle, comprising a knife handle body, a collet disposed at the front end of the knife handle body for loading a knife, and a nut for fastening the collet to the front end of the knife handle body. The front end of the collet is exposed beyond the front end of the nut, and the collet has a clamping space; a mounting cavity is formed at the front end of the knife handle body, and the collet is mounted at the front end of the mounting cavity; the knife handle... The main body has an annular adjustment groove with an isosceles cross-section. The bottom of the annular adjustment groove forms an adjustment thin wall with the inner wall of the mounting cavity, and the side wall of the annular adjustment groove is inclined. The main body of the tool holder also has an adjustment mechanism for adjusting the precision runout of the tool holder. This mechanism includes an adjustment sleeve fixedly fitted around the adjustment mechanism and several adjusting screws screwed onto the adjustment sleeve to press against the side wall of the annular adjustment groove, forcing the adjustment thin wall to deform. The ends of the adjusting screws extend into the annular adjustment groove. In this adjustable tool holder, the connection between the front end of the tool holder body and the nut is threaded, which is also the most common connection method. However, the nut needs to be turned in the same direction during the tightening process, which is slightly cumbersome; and after prolonged use, the threaded connection may loosen in the opposite direction. Utility Model Content

[0004] The present invention aims to provide a CNC tool holder in which the locking cap and the tool holder body are pressed against the collet by the third annular protrusion on the locking cap, the first annular protrusion on the tool holder body, and the annular locking element, thereby fixing the tool. The operation process is simpler and there is no problem of reverse loosening of the threaded connection.

[0005] The technical solution adopted in this utility model is:

[0006] A CNC tool holder, comprising:

[0007] The knife handle body has a front section consisting of a first cylindrical section and a second cylindrical section that are coaxial, and a rear section consisting of a first tapered section with a gradually decreasing diameter. Along the axial center direction of the knife handle body, starting from the free end face of the first cylindrical section, there are a first tapered hole and a cylindrical hole with gradually decreasing diameters. The diameter of the first cylindrical section is smaller than the diameter of the second cylindrical section. A first annular protrusion is formed on the circumferential sidewall of the second cylindrical section adjacent to the first cylindrical section.

[0008] The collet has a front section that is a second tapered section with a gradually increasing diameter and a rear section that is a third tapered section with a gradually decreasing diameter; at least a portion of the third tapered section is fitted into the first tapered hole, and the second tapered section and the remaining portion of the third tapered section are located outside the first tapered hole;

[0009] A locking cap, the inner diameter of which is the same as the outer diameter of the first cylindrical segment, and a second conical hole with a gradually increasing diameter is opened at the center of its closed end; the second conical segment is fitted into the second conical hole; a third annular protrusion is formed on the outer circumferential sidewall of the open end of the locking cap;

[0010] The annular locking component has a U-shaped cross-section. It clamps the third annular protrusion and the first annular protrusion together, and the locking cap and the tool holder body abut against the collet, thereby clamping the tool.

[0011] Furthermore, the outer diameter of the third annular protrusion is the same as the outer diameter of the first annular protrusion.

[0012] Furthermore, an annular groove is provided at the transition connection between the second conical segment and the third conical segment; a second annular protrusion is formed on the inner circumferential sidewall of the locking cap near the position of the second conical hole, and the second annular protrusion can be fitted into the annular groove.

[0013] Furthermore, the wall thickness of the locking cap gradually increases from the open end face of the locking cap to the third annular protrusion on the outer circumferential wall of the locking cap.

[0014] Furthermore, the annular locking component includes two arc-shaped grooves; two adjacent arc-shaped grooves are assembled by ear plates and bolts provided on the outer sides of both ends of the arc-shaped groove in the groove length direction, or, any two adjacent arc-shaped grooves are assembled by ear plates and bolts provided on the outer sides of both ends of the arc-shaped groove in the groove length direction, and the corresponding ends of the remaining arc-shaped grooves are axially connected.

[0015] Furthermore, the outer edge of the third annular protrusion and the first annular protrusion transitions at a rounded angle.

[0016] The beneficial effects of this utility model are:

[0017] The CNC tool holder in this utility model uses the third annular protrusion on the locking cap, the first annular protrusion on the tool holder body, and the annular locking element to make the locking cap and the tool holder body press against the collet, thereby fixing the tool. The operation process is simpler and there is no problem of reverse loosening of the threaded connection. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a front view of the CNC tool holder in the embodiment.

[0020] Figure 2 for Figure 1 Sectional view along the AA direction.

[0021] Figure 3 A three-dimensional structural diagram of the CNC tool holder in the embodiment.

[0022] Figure 4 This is an exploded view of the CNC tool holder in the embodiment.

[0023] Figure label:

[0024] 100-Tool holder body, 200-Collapse collet, 300-Locking cap, 400-Ring locking element.

[0025] 110 - First cylindrical segment, 120 - Second cylindrical segment, 121 - First annular protrusion, 130 - First conical segment, 140 - First conical hole, 150 - Cylindrical hole.

[0026] 210 - Second conical section, 220 - Third conical section, 230 - Annular groove.

[0027] 310 - Second conical hole, 320 - Second annular protrusion, 330 - Third annular protrusion.

[0028] 410 - Arc-shaped groove, 411 - Ear plate. Detailed Implementation

[0029] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this invention.

[0031] The embodiments of the utility model will now be described in detail with reference to the accompanying drawings.

[0032] Figure 1 This is a front view of the CNC tool holder in the embodiment. Figure 1 for Figure 1 Sectional view along the AA direction. Figure 3 A three-dimensional structural diagram of the CNC tool holder in the embodiment. Figure 4 This is an exploded view of the CNC tool holder in the embodiment. Figures 1-4 As shown, the CNC tool holder includes a tool holder body 100. The front section of the tool holder body 100 consists of a coaxial first cylindrical section 110 and a second cylindrical section 120, with the diameter of the first cylindrical section 110 being smaller than the diameter of the second cylindrical section 120. A first annular protrusion 121 is formed on the circumferential sidewall of the second cylindrical section 120 adjacent to the first cylindrical section 110. The rear section of the tool holder body 100 consists of a first tapered section 130 with a gradually decreasing diameter. Along the axial center direction of the tool holder body 100, starting from the free end face of the first cylindrical section 110, a first tapered hole 140 and a cylindrical hole 150 with gradually decreasing diameters are provided.

[0033] like Figures 1-4As shown, the CNC tool holder also includes a collet 200. The front section of the collet 200 is a second tapered section 210 with a gradually increasing diameter; the rear section of the collet 200 is a third tapered section 220 with a gradually decreasing diameter, and the third tapered section 220 mates with the first tapered hole 140; an annular groove 230 is provided at the transition connection between the second tapered section 210 and the third tapered section 220. When the tool is inserted into the collet 200, a portion of the third tapered section 220 is inserted into the first tapered hole 140, while the second tapered section 210, the annular groove 230, and the remaining portion of the third tapered section 220 are located outside the first tapered hole 140. As the third tapered section 220 moves toward the cylindrical hole 150, it is continuously restricted by the first tapered hole 140, causing the clamping space of the collet 200 to continuously narrow, thereby controlling the collet 200 to clamp the tool.

[0034] like Figures 1-4 As shown, the CNC tool holder also includes a locking cap 300. The inner diameter of the locking cap 300 is the same as the outer diameter of the first cylindrical segment 110; a second tapered hole 310 with a gradually increasing diameter is provided at the center of the closed end of the locking cap 300, and the second tapered hole 310 mates with the second tapered segment 210; a second annular protrusion 320 is formed on the inner circumferential sidewall of the locking cap 300 near the second tapered hole 310, and the distance between the second annular protrusion 320 and the open end of the locking cap 300 is greater than the axial length of the first cylindrical segment 110; a third annular protrusion 330 is formed on the outer circumferential sidewall of the open end of the locking cap 300, and the outer diameter of the third annular protrusion 330 is the same as the outer diameter of the first annular protrusion 121. When the locking cap 300 is installed, the second tapered section 210 extends into the second tapered hole 310, the second annular protrusion 320 engages in the annular groove 230, and drives the third tapered section 220 to move towards the cylindrical hole 150 until the third tapered section 220 can no longer move, clamping the tool. At this moment, the open end of the locking cap 300 just touches the end face of the second cylindrical section 120 or there is still a certain gap between them. At the same time, annular locking members 400 with a "U" shaped cross-section can be detachably provided on the third annular protrusion 330 and the first annular protrusion 121. The edges of the third annular protrusion 330 and the first annular protrusion 121 simultaneously engage in the U-shaped groove area of ​​the annular locking member 400, clamping the third annular protrusion 330 and the first annular protrusion 121. Compared to the traditional method of locking tools using threaded connections, this embodiment uses the third annular protrusion on the locking cap, the first annular protrusion on the tool holder body, and the annular locking element to work together to press the locking cap and the tool holder body against the collet, thus fixing the tool. The operation process is simpler and there is no problem of the threaded connection coming loose in the opposite direction.

[0035] In this embodiment, in order to improve the structural stability of the locking cap 300, the wall thickness of the locking cap 300 gradually increases from the open end face of the locking cap 300 to the third annular protrusion 330 on the outer circumferential wall of the locking cap 300.

[0036] In this embodiment, the annular locking member 400 includes two arc-shaped groove members 410, which sequentially enclose to form an annular structure, facilitating installation and disassembly. Adjacent arc-shaped groove members 410 are assembled using ear plates 411 located on the outer sides of both ends of the groove length direction and bolts. Alternatively, any two adjacent arc-shaped groove members 410 can be assembled using ear plates 411 located on the outer sides of both ends of the groove length direction and bolts, while the remaining arc-shaped groove members 410 are axially connected at their corresponding ends. Simultaneously, in the region where the third annular protrusion 330 and the first annular protrusion 121 can easily engage with the groove of the arc-shaped groove member 410, the outer edges of the third annular protrusion 330 and the first annular protrusion 121 have rounded corner transitions.

Claims

1. A CNC tool holder, characterized in that, include: The knife handle body has a front section consisting of a first cylindrical section and a second cylindrical section that are coaxial, and a rear section consisting of a first tapered section with a gradually decreasing diameter. Along the axial center direction of the knife handle body, starting from the free end face of the first cylindrical section, there are a first tapered hole and a cylindrical hole with gradually decreasing diameters. The diameter of the first cylindrical section is smaller than the diameter of the second cylindrical section. A first annular protrusion is formed on the circumferential sidewall of the second cylindrical section adjacent to the first cylindrical section. The collet has a front section that is a second tapered section with a gradually increasing diameter and a rear section that is a third tapered section with a gradually decreasing diameter; at least a portion of the third tapered section is fitted into the first tapered hole, and the second tapered section and the remaining portion of the third tapered section are located outside the first tapered hole; A locking cap, the inner diameter of which is the same as the outer diameter of the first cylindrical segment, and a second conical hole with a gradually increasing diameter is opened at the center of its closed end; the second conical segment is fitted into the second conical hole; a third annular protrusion is formed on the outer circumferential sidewall of the open end of the locking cap; The annular locking component has a U-shaped cross-section. It clamps the third annular protrusion and the first annular protrusion together, and the locking cap and the tool holder body abut against the collet, thereby clamping the tool.

2. The CNC tool holder according to claim 1, characterized in that, The outer diameter of the third annular protrusion is the same as the outer diameter of the first annular protrusion.

3. The CNC tool holder according to claim 1, characterized in that, An annular groove is provided at the transition connection between the second conical segment and the third conical segment; a second annular protrusion is formed on the inner circumferential sidewall of the locking cap near the position of the second conical hole, and the second annular protrusion can be fitted into the annular groove.

4. The CNC tool holder according to claim 1, characterized in that, The wall thickness of the locking cap gradually increases from the open end face of the locking cap to the third annular protrusion on the outer circumferential wall.

5. The CNC tool holder according to claim 1, characterized in that, The annular locking component includes two arc-shaped grooves; two adjacent arc-shaped grooves are assembled by lugs and bolts provided on the outer sides of both ends of the arc-shaped grooves along the groove length direction, or, any two adjacent arc-shaped grooves are assembled by lugs and bolts provided on the outer sides of both ends of the arc-shaped grooves along the groove length direction, and the corresponding ends of the remaining arc-shaped grooves are axially connected.

6. The CNC tool holder according to claim 1, characterized in that, The outer edge of the third annular protrusion and the first annular protrusion transitions at a rounded angle.

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