Milling chuck body of numerical control machine tool

Abstract

The utility model relates to the technical field of machine tool accessories, in particular to a numerical control machine tool milling chuck body which comprises an elastic clamping sleeve, the elastic clamping sleeve is nested at the bottom of a cutter handle, the bottom of the elastic clamping sleeve is of a circular truncated cone structure, and one end, close to the axis, of each petal protrudes downwards; the locking screw sleeve is arranged below the elastic clamping sleeve, and the locking screw sleeve is in threaded fit with the cutter handle; and the centering gasket is arranged between the elastic clamping sleeve and the locking threaded sleeve, and a concave table matched with the circular table is arranged at the top of the centering gasket. According to the centering gasket, the concentricity of the centering gasket and the cutter handle is guaranteed through the locking threaded sleeve, the concave table on the top is used for enabling all the petals of the elastic clamping sleeve to move towards the axis direction together, and therefore the accuracy of the final clamped position of the cutter is guaranteed, and a machined workpiece has the accurate machining size.

Description

Technical Field

[0001] The utility model relates to the technical field of machine tool accessories, in particular to a milling chuck body for a numerically controlled machine tool. Background Art

[0002] At present, milling chucks are often needed in CNC machine tools. The milling chuck is installed at the end of the milling machine spindle and is used to clamp the chuck of the milling cutter. The milling chuck serves as a transition piece between the milling cutter and the spindle. The spindle mounting seat is clamped with the upper and lower clamping blocks of the milling chuck cone to complete the fixation of the milling chuck. The spindle power is transmitted to the milling cutter through the milling chuck, thereby completing the workpiece processing.

[0003] Existing milling chucks utilize an elastic sleeve structure, which retracts into the toolholder by tightening the nut, thereby clamping the milling cutter. However, during the tightening process, the base of each petal of the milling chuck rubs against the nut, causing uneven elastic deformation. This results in slight deviations in the retraction of each petal. These deviations can cause slight misalignment between the milling cutter and the machine tool spindle, causing deviations in the machining data of some precision parts and affecting machining accuracy. Utility Model Content

[0004] The utility model provides a milling chuck body for CNC machine tools, wherein a centering gasket ensures concentricity with a tool handle through a locking screw sleeve, and utilizes a concave platform on the top to enable the petals of the elastic collet to move together toward the axial center, thereby ensuring the accuracy of the final clamping position of the tool and ensuring that the workpiece being processed has precise processing dimensions.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical solution: a milling chuck body for CNC machine tools, comprising: an elastic sleeve, which is nested in the bottom of a tool handle, and the bottom of the elastic sleeve is a frustum structure, and one end of each petal close to the axis protrudes downward; a locking screw sleeve, which is arranged below the elastic sleeve, and the locking screw sleeve is threadedly matched with the tool handle; a centering gasket, which is arranged between the elastic sleeve and the locking screw sleeve, and the top of the centering gasket is provided with a concave table adapted to the frustum.

[0006] Preferably, a positioning strip is provided at the center of each petal along the radial direction of the elastic jacket; and a positioning groove is provided in the concave platform corresponding to each positioning strip.

[0007] Preferably, a circular groove is provided in the locking screw sleeve, and the centering gasket is adapted to fit in the circular groove.

[0008] Preferably, an isolation gasket and a rotating gasket are sequentially provided at the bottom of the centering gasket, and the isolation gasket is made of nylon; the rotating gasket, the isolation gasket and the lower half of the centering gasket are all embedded in the circular groove.

[0009] Preferably, the bottom of the centering gasket and the top of the rotating gasket are respectively provided with shallow annular grooves in the circumferential direction.

[0010] The beneficial effects of the present invention are as follows: during the tightening of the locking nut, the elastic jacket is pushed toward the interior of the tool shank by the centering washer. During this process, the concave portion of the centering washer and the concave portion of the bottom of the elastic jacket form a mating conical surface. This, combined with the working contraction between the elastic jacket and the tool shank, causes the elastic jacket to contract, thereby achieving tool clamping. During this process, the centering washer ensures concentricity with the tool shank through the locking nut, and utilizes the concave portion at the top to move the individual petals of the elastic jacket toward the axis, thereby ensuring the accuracy of the final clamping position of the tool. When the tool and tool shank are completely coaxial, the workpiece being machined can be precisely dimensioned. During the tightening of the elastic jacket, the individual petals slide toward the axis along the positioning grooves via the bottom positioning strips, thereby ensuring the movement path of each petal. The isolation washer is used to isolate the rotating washer from the centering washer, preventing the locking nut from transmitting torque to the elastic jacket during rotation, thereby preventing the individual petals of the elastic jacket from deflecting due to external forces. The shallow ring groove is used to store grease, thereby reducing the friction resistance of the isolation gasket. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0012] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0013] Figure 2 This is a schematic diagram of the bottom structure of the elastic jacket of the utility model.

[0014] In the figure: 1. elastic jacket; 2. petals; 3. locking screw sleeve; 4. centering gasket; 5. positioning strip; 6. positioning groove; 7. circular groove; 8. isolation gasket; 9. rotating gasket; 10. shallow annular groove. DETAILED DESCRIPTION

[0015] The following will be combined with the accompanying drawings of the present invention to clearly and completely describe the technical solution of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0016] according to Figure 1 、 Figure 2 As shown, a milling chuck body for a CNC machine tool comprises: an elastic sleeve 1, which is nested at the bottom of a tool handle, and the bottom of the elastic sleeve 1 is a truncated cone structure, and each petal 2 protrudes downward at one end close to the axis; a locking screw 3, which is arranged below the elastic sleeve 1 and is threadedly engaged with the tool handle; a centering washer 4, which is arranged between the elastic sleeve 1 and the locking screw 3, and the top of the centering washer 4 is provided with a concave platform adapted to the truncated cone. A circular groove 7 is provided in the locking screw 3, and the centering washer 4 is adapted to fit within the circular groove 7.

[0017] Through the above arrangement, during the tightening process of the locking nut 3, the elastic jacket 1 is pushed into the tool handle by the centering washer 4. During this process, the concave platform of the centering washer and the truncated cone at the bottom of the elastic jacket 1 form a matching conical surface, and the working contraction between the elastic jacket 1 and the tool handle causes the elastic jacket 1 to contract, thereby achieving tool clamping. During this process, the centering washer 4 ensures concentricity with the tool handle through the locking nut 3, and uses the concave platform at the top to move the petals 2 of the elastic jacket 1 together toward the axis, thereby ensuring the accuracy of the final clamping position of the tool. When the tool and the tool handle are completely coaxial, the workpiece being processed can have a precise processing size.

[0018] A positioning strip 5 is provided at the center of each petal 2 along the radial direction of the elastic jacket 1 ; and a positioning groove 6 is provided in the concave platform corresponding to each positioning strip 5 .

[0019] With this arrangement, during the tightening process of the elastic jacket 1 , each petal 2 slides along the positioning groove 6 toward the axis through the positioning strip 5 at the bottom, thereby ensuring the movement path of each petal 2 .

[0020] An isolation gasket 8 and a rotating gasket 9 are sequentially provided at the bottom of the centering gasket 4 , and the isolation gasket 8 is made of nylon. The rotating gasket 9 , the isolation gasket 8 and the lower half of the centering gasket 4 are all embedded in the circular groove 7 .

[0021] In this setting, the isolation washer is used to isolate the rotating gasket 9 and the centering gasket 4 to prevent the locking nut 3 from transmitting torque to the elastic sleeve 1 during rotation, so as to avoid affecting the offset problem of the petals 2 of the elastic sleeve 1 caused by external force.

[0022] The bottom of the centering gasket 4 and the top of the rotating gasket 9 are respectively circumferentially provided with a shallow annular groove 10. The function of the shallow annular groove 10 is to store grease, thereby reducing the friction resistance of the isolation gasket 8.

[0023] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A milling chuck body for CNC machine tools, characterized in that ,include: An elastic jacket (1), wherein the elastic jacket (1) is nested at the bottom of the knife handle, and the bottom of the elastic jacket (1) is a truncated cone structure, and one end of each petal (2) close to the axis protrudes downward; A locking screw sleeve (3), wherein the locking screw sleeve (3) is arranged below the elastic sleeve (1), and the locking screw sleeve (3) is threadably matched with the tool handle; A centering gasket (4) is provided between the elastic sleeve (1) and the locking nut (3), and a concave platform adapted to the truncated table is provided on the top of the centering gasket (4).

2. A milling chuck body for CNC machine tools according to claim 1, characterized in that: A positioning strip (5) is provided at the center of each petal (2) along the radial direction of the elastic jacket (1); and a positioning groove (6) is provided in the concave platform corresponding to each positioning strip (5).

3. The milling chuck body for CNC machine tools according to claim 1, characterized in that: A circular groove (7) is provided in the locking screw sleeve (3), and the centering washer (4) is adapted to fit in the circular groove (7).

4. A milling chuck body for CNC machine tools according to claim 3, characterized in that: An isolation gasket (8) and a rotating gasket (9) are sequentially provided at the bottom of the centering gasket (4), and the isolation gasket (8) is made of nylon; the rotating gasket (9), the isolation gasket (8) and the lower half of the centering gasket (4) are all embedded in the circular groove (7).

5. A milling chuck body for CNC machine tools according to claim 4, characterized in that: The bottom of the centering gasket (4) and the top of the rotating gasket (9) are respectively provided with shallow annular grooves (10) in the circumferential direction.

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