Floating cutter handle

Abstract

The utility model belongs to the technical field of numerical control machine tool accessories, and provides a floating cutter handle which comprises a seat sleeve, a cutter head and a cutter head. One end of the clamping piece extends into the seat sleeve, and the other end of the clamping piece is used for clamping a cutter; the first floating piece is connected with the end, extending into the seat sleeve, of the clamping piece and used for achieving axial floating of the tool; and the second floating piece and the middle of the clamping piece are connected in the seat sleeve, and the second floating piece is used for achieving radial floating of the cutter. Through the arrangement of the first floating piece and the second floating piece, axial floating and radial floating of the cutter can be achieved respectively; therefore, the problems that the quality and the precision of a machined part cannot be guaranteed during reaming due to the fact that a reamer and a screw tap are clamped through rigid connection of an existing cutter handle, and the screw tap is prone to deflection and breakage during tapping are effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of CNC machine tool accessories technology, specifically to a floating tool holder. Background Technology

[0002] As is well known, reaming and tapping are essential steps in metal cutting, involving reamers and taps, respectively. Reamers and taps are typically rigidly connected, clamped by a tool holder and mounted on a CNC machine tool. The reamers are then driven by the CNC machine tool to perform the reaming and tapping operations. However, existing fixing methods have the following problems:

[0003] 1. During the reaming process, due to factors such as machine tool accuracy and product vertical positioning and clamping, there is a coaxiality error between the reamer center and the product hole diameter center. At the same time, since the reamer and the tool holder are rigidly connected, under the action of the centrifugal force of the machine tool spindle rotation, a larger range of errors will inevitably accumulate. As a result, the hole diameter accuracy, form and position tolerance and roughness of the machined part cannot reach the ideal effect, that is, the quality and accuracy of the machined part cannot be guaranteed.

[0004] 2. During tapping operations, when the tap drills to a certain depth, due to control tolerances or equipment inertia, the tap may experience slight axial or radial offset. At the same time, the tap tip may deflect within the threaded hole, causing the internal thread and the tapping teeth to no longer mesh. This results in a sudden and significant torque change when the tap is inserted and withdrawn, leading to tap breakage, shortening the tap's lifespan, and severely reducing the machining efficiency of CNC machine tools. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a floating tool holder to solve the problems of existing tool holders using rigid connections to clamp the reamer and tap, which makes it impossible to guarantee the quality and accuracy of the workpiece during reaming, and the tap being prone to deflection and breakage during tapping.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A floating tool holder, comprising:

[0008] Seat cover, for connection to CNC machine tools;

[0009] A clamping element, one end of which extends into the seat sleeve, and the other end of which is used to clamp the cutting tool;

[0010] The first floating element is connected to one end of the clamping element that extends into the seat sleeve, and is used to realize the axial floating of the tool; and

[0011] The second floating component is connected to the middle of the clamping component inside the seat sleeve, and is used to realize the radial floating of the tool.

[0012] Optionally, the seat cover has an inner cavity running through its axis, which is mainly composed of a first post hole, a second post hole, a third post hole, a fourth post hole and a fifth post hole;

[0013] The inner diameters of the first, second, and third post holes decrease sequentially to form a first annular step and a second annular step between the first and second post holes, and between the second and third post holes;

[0014] The inner diameters of the third, fourth, and fifth post holes increase sequentially to form a third and fourth annular steps between the third and fourth post holes and between the fourth and fifth post holes.

[0015] The clamping member includes an elastic collet, which has an integrally formed small-diameter section and a large-diameter section. The small-diameter section passes through the fifth post hole, the fourth post hole and the third post hole in sequence and is connected to the first floating member at the second post hole. The large-diameter section is connected to the second floating member at the fifth post hole.

[0016] Optionally, the outer diameter of the seat corresponding to the first and second column holes is small and its cross-section is a flat square structure, which is used to fix it to the spindle of the CNC machine tool.

[0017] The outer diameter of the seat corresponding to the fourth and fifth column holes is larger, which is used to limit the depth to which the seat with the smaller outer diameter is inserted into the spindle.

[0018] Optionally, the clamping member further includes an elastic limiting ring;

[0019] The limiting ring is built into the fourth column hole and is slidably sleeved on the small diameter section with a flat square cross-section through the flat square hole opened in its middle.

[0020] The limiting ring is provided with a pair of symmetrically arranged lugs spaced 180° apart, and the lugs are engaged with a pair of limiting grooves opened radially along the fourth column hole.

[0021] Optionally, the first floating member includes a first screw and a first elastic member. The first screw is threaded to the end of the small-diameter section and its head outer diameter is smaller than the diameter of the second column hole. The first elastic member is sleeved on the small-diameter section and its two ends are respectively in contact with the second annular step and the head of the first screw.

[0022] When the tool is retracted after tapping, the first elastic element is compressed, and the elastic collet can extend outward from the inner cavity to achieve axial floating of the tool so as to ensure the quality of tapping through flexible rebound.

[0023] Optionally, the first floating element further includes a second screw;

[0024] The outer diameter of the second screw head is larger than the diameter of the second post hole and smaller than the diameter of the first post hole;

[0025] The second screw is screwed into the head of the first screw by means of a threaded connection and passes through it so that the head of the second screw abuts against the head of the first screw and the first annular step, in order to limit the axial floating of the tool and ensure the quality of the reaming when the tool is withdrawn after reaming is completed.

[0026] Optionally, the second floating component includes a floating ring and a locking nut. The floating ring is slidably sleeved on the large diameter section. The floating ring has multiple circumferentially distributed through holes along its axial direction. A ball and a second elastic element are installed in each of the through holes. The ball extends out of the through hole and rolls into a V-shaped groove on the fourth annular step. One end of the second elastic element abuts against the ball, and the other end extends out of the through hole and abuts against the locking nut. The locking nut is movably sleeved on the large diameter section and threadedly connected to the seat corresponding to the fifth column hole.

[0027] The outer diameter of the small diameter section is smaller than the diameter of the third column hole, the outer diameter of the limiting ring is smaller than the diameter of the fourth column hole, the length of the support lug is smaller than the length of the limiting groove, the outer diameter of the floating ring is smaller than the diameter of the fifth column hole, and the inner diameter of the locking nut is larger than the outer diameter of the large diameter section, so as to leave a ring-shaped floating gap between the corresponding two.

[0028] Optionally, the floating ring has an annular retaining strip radially inward at one end facing the fourth annular step;

[0029] The annular locking strip engages with the annular notch on the end face of the large-diameter section facing the small-diameter section, and is used to block the limiting ring when the elastic collet extends outward from the inner cavity to prevent it from moving with the elastic collet.

[0030] Optionally, an annular sealing groove is provided on the inner circumferential sidewall of the locking nut;

[0031] An O-ring is installed inside the annular sealing groove;

[0032] The O-ring seal is fitted onto the large-diameter section to prevent debris generated during processing from entering the fifth column hole, thus ensuring the normal use of the second floating component.

[0033] Optionally, the large-diameter section has a receiving cavity for placing the cutting tool;

[0034] The large-diameter section at the outlet end of the receiving cavity is threaded with a collet nut for locking the tool.

[0035] Compared with the prior art, the beneficial effects of this utility model are:

[0036] 1. By setting the first and second floating components, the axial and radial floating of the tool can be realized respectively, thereby effectively solving the problems of existing tool holders using rigid connection to clamp the reamer and tap, which makes it impossible to guarantee the quality and accuracy of the workpiece during reaming and the tap is prone to deflection and breakage during tapping.

[0037] 2. By fitting the small diameter section with the flat square hole and engaging the lug with the limiting groove, the axial rotation of the elastic collet can be effectively restricted, thereby ensuring that the torque generated by the CNC machine tool spindle is effectively transmitted to the cutting tool to achieve workpiece machining.

[0038] 3. By limiting the second screw, the elastic collet can be locked during reaming, preventing the tool from floating axially. This prevents the tool from flexibly springing back during retraction, thus ensuring the quality of the reaming.

[0039] 4. Through the reserved floating gap, the ball can roll radially along the V-shaped ring groove, thereby realizing the radial floating of the tool (because the limiting ring is elastic, its lug can generate elastic deformation in the limiting groove without hindering the radial floating of the tool). After floating, the ball will automatically roll back into the V-shaped ring groove by the restoring force of the second elastic element, thus realizing the autonomous centering of the tool after machining. Attached Figure Description

[0040] 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.

[0041] Figure 1 This is a schematic diagram of the exploded structure of this utility model;

[0042] Figure 2 This is a three-dimensional structural diagram of the present invention;

[0043] Figure 3 This is a schematic diagram of the main cross-section of the present invention when the first floating component is released;

[0044] Figure 4 This is a schematic diagram of the main cross-sectional structure of the present invention when the first floating component is locked;

[0045] Figure 5 for Figure 3Schematic diagram of the cross-sectional structure along the middle AA direction;

[0046] Figure 6 This is a schematic diagram of the left-side structure of the seat cover;

[0047] Figure 7 This is a schematic diagram of the main cross-section of the seat cover. Detailed Implementation

[0048] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0049] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "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.

[0050] 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.

[0051] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0052] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0053] 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.

[0054] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0055] See Figures 1 to 7 As shown, this utility model provides a floating tool holder, comprising:

[0056] The seat cover 100 is connected to the CNC machine tool (not shown in the figure);

[0057] Clamping member 200, one end of which extends into the seat 100, and the other end is used to clamp the tool (not shown in the figure).

[0058] The first floating element 300 is connected to one end of the clamping element 200 that extends into the seat sleeve 100, and is used to realize the axial floating of the tool; and

[0059] The second floating member 400 is connected to the middle of the clamping member 200 inside the seat 100 and is used to realize the radial floating of the tool.

[0060] Specifically, the seat sleeve 100 has an inner cavity running through its axis, which is mainly composed of a first post hole 110, a second post hole 120, a third post hole 130, a fourth post hole 140, and a fifth post hole 150; the inner diameters of the first post hole 110, the second post hole 120, and the third post hole 130 decrease sequentially, so as to form a first annular step 160 and a second annular step 170 between the first post hole 110 and the second post hole 120, and between the second post hole 120 and the third post hole 130; the inner diameters of the third post hole 130, the fourth post hole 140, and the fifth post hole 150 decrease sequentially. The size is increased to form a third annular step 180 and a fourth annular step 190 between the third post hole 130 and the fourth post hole 140, and between the fourth post hole 140 and the fifth post hole 150; the clamping member 200 includes an elastic collet 210, which has an integrally formed small diameter section 211 and a large diameter section 212. The small diameter section 211 passes through the fifth post hole 150, the fourth post hole 140 and the third post hole 130 in sequence and is connected to the first floating member 300 and the second post hole 120. The large diameter section 212 is connected to the second floating member 400 and the fifth post hole 150.

[0061] The outer diameter of the sleeve 100 corresponding to the first column hole 110 and the second column hole 120 is smaller and its cross-section is flat and rectangular, which is used to fix it to the spindle of the CNC machine tool; the outer diameter of the sleeve 100 corresponding to the fourth column hole 140 and the fifth column hole 150 is larger, which is used to limit the depth of the smaller outer diameter sleeve 100 inserted into the spindle.

[0062] To ensure that the torque generated by the CNC machine tool spindle is effectively transmitted to the cutting tool and to prevent the elastic collet 210 from rotating relative to the workpiece due to machining resistance during contact, the clamping member 200 also includes an elastic limiting ring 220. The limiting ring 220 is built into the fourth column hole 140 and slides on the small-diameter section 211 with a flat square cross-section through a flat square hole 221 in its middle. The limiting ring 220 has a pair of symmetrically arranged lugs 222 spaced 180° apart. The lugs 222 are engaged with a pair of limiting grooves 141 opened radially in the fourth column hole 140. Through the cooperation between the small-diameter section 211 and the flat square hole 221, and the engagement between the lugs 222 and the limiting grooves 141, the axial rotation of the elastic collet 210 can be effectively limited, thereby ensuring that the torque generated by the CNC machine tool spindle is effectively transmitted to the cutting tool to achieve workpiece machining.

[0063] The first floating member 300 includes a first screw 310 and a first elastic member 320. The first screw 310 is threaded to the end of the small-diameter section 211, and its head outer diameter is smaller than the diameter of the second post hole 120. The first elastic member 320 is sleeved on the small-diameter section 211, and its two ends are respectively in contact with the second annular step 170 and the head of the first screw 310. When the tapping is completed and the tool is retracted, the first elastic member 320 is compressed, and the elastic collet 210 can extend outward from the inner cavity (e.g., Figure 3As shown, the maximum outward extension distance of the elastic collet 210 is 9mm, which is the axial floating distance range of the tool. This is used to achieve axial floating of the tool to ensure the quality of tapping through flexible rebound. Adjusting the depth of the first screw 310 into the end of the small diameter section 211 can adjust the preload of the first elastic element 320, thereby adjusting the force required for the elastic collet 210 to extend outward from the inner cavity.

[0064] See Figure 3 and Figure 4 As shown, the first floating member 300 also includes a second screw 330. The outer diameter of the head of the second screw 330 is larger than the diameter of the second post hole 120 and smaller than the diameter of the first post hole 110. The second screw 330 is screwed into the head of the first screw 310 by means of a threaded connection and passes through it so that the head of the second screw 330 abuts against the head of the first screw 310 and the first annular step 160, which is used to limit the axial floating of the tool to ensure the quality of the reaming when the tool is retracted after reaming. By limiting the second screw 330, the elastic collet 210 can be locked during reaming to prevent the tool from floating axially, so that the tool cannot flexibly spring back during retraction to ensure the quality of the reaming.

[0065] The second floating component 400 includes a floating ring 410 and a locking nut 420. The floating ring 410 is slidably sleeved on the large diameter section 212. The floating ring 410 has multiple circumferentially distributed through holes along its axial direction. Each through hole is equipped with a ball 430 and a second elastic component 440. The ball 430 extends out of the through hole and rolls in connection with the V-shaped groove 191 on the fourth annular step 190. One end of the second elastic component 440 abuts against the ball 430, and the other end extends out of the through hole and abuts against the locking nut 420. The locking nut 420 is movably sleeved. The seat 100 is threaded onto the large diameter section 212 and corresponds to the fifth post hole 150; the outer diameter of the small diameter section 211 is smaller than the diameter of the third post hole 130, the outer diameter of the limiting ring 220 is smaller than the diameter of the fourth post hole 140, the length of the support lug 222 is smaller than the length of the limiting groove 141, the outer diameter of the floating ring 410 is smaller than the diameter of the fifth post hole 150, and the inner diameter of the locking nut 420 is larger than the outer diameter of the large diameter section 212, so as to leave a ring-shaped floating gap between the corresponding two (the minimum value of the floating gap is 0.5mm). Through the reserved floating gap, the ball 430 can roll radially along the V-shaped ring groove 191, thereby realizing the radial floating of the tool (since the limiting ring 220 is elastic, its lug 222 can generate elastic deformation in the limiting groove 141 without hindering the radial floating of the tool). After floating, the ball 430 will automatically roll back into the V-shaped ring groove 191 by the restoring force of the second elastic element 440, thereby realizing the autonomous centering of the tool after machining.

[0066] In this embodiment, four balls 430 and four second elastic elements 440 are evenly distributed around the circumference; both the first elastic element 320 and the second elastic element 440 are springs.

[0067] The floating ring 410 has an annular retaining strip at one end facing the fourth annular step 190, which engages with an annular notch on the end face of the large diameter section 212 facing the small diameter section 211. This is used to block the limiting ring 220 to prevent it from moving with the elastic collet 210 when the elastic collet 210 extends outward from the inner cavity (i.e., the tool floats axially).

[0068] An annular sealing groove 421 is provided on the inner circumference of the locking nut 420. An O-ring 450 is installed in the annular sealing groove 421. The O-ring 450 is fitted on the large diameter section 212 to prevent debris generated during processing from entering the fifth column hole 150 to ensure the normal use of the second floating part 400.

[0069] The large-diameter section 212 has a receiving cavity for placing the cutting tool; the large-diameter section 212 at the outlet end of the receiving cavity is threadedly connected to a collet nut 230 for locking the cutting tool.

[0070] In summary, by setting the first floating component 300 and the second floating component 400, the axial floating and radial floating of the tool can be realized respectively, thereby effectively solving the problems of existing tool holders using rigid connection to clamp the reamer and tap, which makes it impossible to guarantee the quality and accuracy of the workpiece during reaming and the tap is prone to deflection and breakage during tapping.

[0071] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.

Claims

1. A floating tool holder, characterized in that, include: Seat cover, for connection to CNC machine tools; A clamping element, one end of which extends into the seat sleeve, and the other end of which is used to clamp the cutting tool; The first floating element is connected to one end of the clamping element that extends into the seat sleeve, and is used to realize the axial floating of the tool; and The second floating component is connected to the middle of the clamping component inside the seat sleeve, and is used to realize the radial floating of the tool.

2. The floating tool holder according to claim 1, characterized in that: The seat sleeve has an inner cavity that runs through its axis, which is mainly composed of a first post hole, a second post hole, a third post hole, a fourth post hole and a fifth post hole; The inner diameters of the first, second, and third post holes decrease sequentially to form a first annular step and a second annular step between the first and second post holes, and between the second and third post holes; The inner diameters of the third, fourth, and fifth post holes increase sequentially to form a third and fourth annular steps between the third and fourth post holes and between the fourth and fifth post holes. The clamping member includes an elastic collet, which has an integrally formed small-diameter section and a large-diameter section. The small-diameter section passes through the fifth post hole, the fourth post hole and the third post hole in sequence and is connected to the first floating member at the second post hole. The large-diameter section is connected to the second floating member at the fifth post hole.

3. The floating tool holder according to claim 2, characterized in that: The outer diameter of the seat corresponding to the first and second column holes is small and its cross-section is a flat square structure, which is used to fix and connect with the spindle of the CNC machine tool. The outer diameter of the seat corresponding to the fourth and fifth column holes is larger, which is used to limit the depth to which the seat with the smaller outer diameter is inserted into the spindle.

4. The floating tool holder according to claim 2 or 3, characterized in that: The clamping element also includes an elastic limiting ring; The limiting ring is built into the fourth column hole and is slidably sleeved on the small diameter section with a flat square cross-section through the flat square hole opened in its middle. The limiting ring is provided with a pair of symmetrically arranged lugs spaced 180° apart, and the lugs are engaged with a pair of limiting grooves opened radially along the fourth column hole.

5. The floating tool holder according to claim 4, characterized in that: The first floating member includes a first screw and a first elastic member. The first screw is threaded to the end of the small-diameter section and its head outer diameter is smaller than the diameter of the second column hole. The first elastic member is sleeved on the small-diameter section and its two ends are respectively in contact with the second annular step and the head of the first screw. When the tool is retracted after tapping, the first elastic element is compressed, and the elastic collet can extend outward from the inner cavity to achieve axial floating of the tool so as to ensure the quality of tapping through flexible rebound.

6. The floating tool holder according to claim 5, characterized in that: The first floating component also includes a second screw; The outer diameter of the second screw head is larger than the diameter of the second post hole and smaller than the diameter of the first post hole; The second screw is screwed into the head of the first screw by means of a threaded connection and passes through it so that the head of the second screw abuts against the head of the first screw and the first annular step, in order to limit the axial floating of the tool and ensure the quality of the reaming when the tool is withdrawn after reaming is completed.

7. The floating tool holder according to claim 5 or 6, characterized in that: The second floating component includes a floating ring and a locking nut. The floating ring is slidably sleeved on the large diameter section. The floating ring has multiple circumferentially distributed through holes along its axial direction. A ball and a second elastic element are installed in each of the through holes. The ball extends out of the through hole and rolls into a V-shaped groove on the fourth annular step. One end of the second elastic element abuts against the ball, and the other end extends out of the through hole and abuts against the locking nut. The locking nut is movably sleeved on the large diameter section and threadedly connected to the seat corresponding to the fifth column hole. The outer diameter of the small diameter section is smaller than the diameter of the third column hole, the outer diameter of the limiting ring is smaller than the diameter of the fourth column hole, the length of the support lug is smaller than the length of the limiting groove, the outer diameter of the floating ring is smaller than the diameter of the fifth column hole, and the inner diameter of the locking nut is larger than the outer diameter of the large diameter section, so as to leave a ring-shaped floating gap between the corresponding two.

8. The floating tool holder according to claim 7, characterized in that: The floating ring has an annular retaining strip radially inward at one end facing the fourth annular step. The annular locking strip engages with the annular notch on the end face of the large-diameter section facing the small-diameter section, and is used to block the limiting ring when the elastic collet extends outward from the inner cavity to prevent it from moving with the elastic collet.

9. The floating tool holder according to claim 7, characterized in that: The locking nut has an annular sealing groove on its inner circumferential wall; An O-ring is installed inside the annular sealing groove; The O-ring seal is fitted onto the large-diameter section to prevent debris generated during processing from entering the fifth column hole, thus ensuring the normal use of the second floating component.

10. The floating tool holder according to claim 2 or 9, characterized in that: The large-diameter section has a receiving cavity for placing the cutting tool; The large-diameter section at the outlet end of the receiving cavity is threaded with a collet nut for locking the tool.

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