Shockproof special milling cutter for curved surface machining

Abstract

The utility model discloses a kind of milling cutter of shockproof type curved surface processing special purpose, it is related to milling cutter technical field, including tool bar, floating bushing and shock absorber stick;The tool bar is equipped with spherical cutter head by connecting piece;The floating bushing is fixedly arranged in the inside of tool bar;Energy consumption generated by vibration is consumed by floating bushing, shock absorber stick and damping medium cooperation, avoid to cause damage to machine tool, tool bar, spherical cutter head, handle and connecting piece are used in cooperation, can change inherent frequency, avoid and add cutting frequency, reduce vibration generated when milling cutter works, prolong the service life of milling cutter, by the core rod, spherical projection and micro bump of setting, shock absorber stick movement trajectory can be limited, avoid disorder and reduce movement friction Shake, improve vibration response speed, by the rubber elastic layer, metal sleeve connecting piece, helical micro groove cooperation of setting can carry out multilayer buffering and shock absorption, inhibit multi-band vibration and respond to temperature wear deformation.

Description

Technical Field

[0001] This utility model belongs to the field of milling cutter technology, specifically a shockproof milling cutter for machining curved surfaces. Background Technology

[0002] Milling cutters are core rotary cutting tools in the machining field, widely used in milling processes. They remove and shape workpiece material through intermittent cutting with multiple teeth. Surface milling cutters are special milling cutters designed for the machining of complex curved surfaces. Their core features are that the cutting edge shape adapts to the surface contour, the cutting path conforms to the curvature change, and the vibration resistance adapts to multi-directional cutting forces. They can solve problems such as low surface accuracy, easy chipping of the cutting edge, and poor machining efficiency when machining curved surfaces with ordinary milling cutters. Depending on the curvature characteristics of the surface, machining accuracy, and material, milling cutter types are usually set as ball end mills and nose end mills. Therefore, a vibration-resistant surface milling cutter is needed.

[0003] Existing milling cutters for surface machining typically consist of a cutter shank and a cutter head. When machining curved surfaces, the milling cutter must withstand a combined load of radial, axial, and normal forces. This load changes in real time with the curvature of the surface, making the milling cutter prone to vibration. This vibration directly damages the surface accuracy, leading to product scrap, shortening the milling cutter's lifespan, and increasing machining costs. The vibration is also transmitted through the cutter to the machine tool spindle, damaging the machining equipment, affecting production stability, reducing machining efficiency, and extending the production cycle, thus failing to meet people's needs. Utility Model Content

[0004] The present invention aims to solve the technical problems existing in the prior art; to this end, the present invention proposes a shockproof milling cutter for machining curved surfaces.

[0005] A shock-resistant milling cutter for machining curved surfaces includes a cutter shank, a floating bushing, and a shock-absorbing rod. The tool holder is equipped with a spherical cutter head for curved surface machining via a connector. The tool holder, connector, and spherical cutter head are integrally formed. The connector has a frustum structure. The diameter of the tool holder, connector, and spherical cutter head decreases sequentially, which changes the natural frequency of the milling cutter and avoids superposition with the cutting frequency. The floating bushing is fixedly installed inside the tool holder; The damping rod is movably disposed inside the floating bushing and suppresses vibration transmission through the damping medium. The inside of the tool bar is provided with a damping cavity for the floating bushing, damping rod and damping medium to work.

[0006] As a further embodiment of this utility model: the shock-absorbing rod includes a core rod and a spherical protrusion; The spherical protrusion is located inside the floating bushing and extends out of the floating bushing at both ends. The spherical protrusion is made of high-density alloy. Through the enhancement of mass inertia and relative motion with the tool holder, the greater the motion amplitude, the more energy is dissipated by damping. The mandrel is located at one end of the spherical protrusion and moves in the damping medium. The mandrel has a spherical structure and fits against the floating bushing. The mandrel is made of an elastic material and can rotate in the damping medium.

[0007] As a further embodiment of this utility model: the floating bushing is provided with a through groove for the mandrel to rotate; The core rod has micro-bumps arranged in a circular array, and there are gaps between several micro-bumps and through slots. Several micro-bumps are engraved in rows on the core rod by laser. The microbumps form a micro-cushion effect on the mandrel, which reduces the coefficient of friction compared to a smooth surface. In addition, the microbumps can store a small amount of damping medium to avoid jamming caused by dry friction.

[0008] As a further embodiment of this utility model: the floating bushing includes a metal sleeve and a rubber elastic layer; The metal sleeve is fixedly installed inside the tool holder and the spherical protrusion is movably supported by a damping medium; The rubber elastic layer is disposed inside the metal sleeve and dissipates vibration energy; When the temperature rises and the mandrel expands thermally, the rubber elastic layer can absorb the radial expansion through elastic deformation, stabilizing the mating gap within the range of 0.1 to 0.3 mm; at the same time, the damping characteristics of the rubber elastic layer can additionally consume vibration energy.

[0009] As a further embodiment of this utility model: the inner wall of the metal sleeve is provided with a spiral microgroove for storing a portion of the damping medium; The spiral microgroove is connected to the through groove; The spiral microgroove and the damping medium form a synergistic lubrication system; when the mandrel undergoes radial displacement, the spiral microgroove can store part of the damping medium, forming a continuous oil film lubrication layer to avoid dry friction.

[0010] As a further embodiment of this utility model: the interior of the metal sleeve is provided with a connecting groove that matches the rubber elastic layer; Both the rubber elastic layer and the connecting groove have a circular structure.

[0011] As a further embodiment of this utility model: one end of the tool bar is provided with a tool handle via a mounting block; The tool holder is equipped with a sealing element for sealing the damping medium.

[0012] As a further embodiment of this utility model: the knife handle is provided with a limiting groove for sealing and limiting the sealing element; The mounting block is provided with mounting rods arranged in a circular array to be fixed to the tool holder; The tool holder has several mounting holes for fixing to the mounting rod.

[0013] Compared with the prior art, the beneficial effects of this utility model are: (1) This utility model uses a tool holder, a floating bushing, and a damping rod to enable the tool holder, spherical cutter head, and tool shank to work together to process curved surfaces. The floating bushing, damping rod, and damping medium work together to dissipate the energy generated by vibration, thus avoiding damage to the machine tool. The tool holder, spherical cutter head, tool shank, and connecting parts work together to change the natural frequency, avoid superposition with the cutting frequency, reduce the vibration generated when the milling cutter is working, and thus effectively protect the tool holder, spherical cutter head, and tool shank, extending the service life of the milling cutter. The mandrel, spherical protrusion, and micro-protrusions set up can limit the movement trajectory of the damping rod, avoid disorderly shaking and reduce motion friction, and improve the vibration response speed. The rubber elastic layer, metal sleeve connecting parts, and spiral micro-grooves set up can perform multi-layer buffering and vibration reduction, suppress multi-frequency vibration and cope with temperature wear deformation, maintain structural stability, improve the anti-vibration effect of the milling cutter, thereby improving the yield and processing efficiency of the product and reducing the production cycle. Attached Figure Description

[0014] Figure 1 This is an overall structural diagram of the present invention.

[0015] Figure 2 This is a partial structural diagram of the tool holder and tool shank in this utility model.

[0016] Figure 3 This is a cross-sectional view of the tool holder and tool shank in this utility model.

[0017] Figure 4 This is a partial structural diagram of the shock absorber rod in this utility model.

[0018] Figure 5 This is a partial structural diagram of the floating bushing in this utility model.

[0019] In the diagram: 1. Tool holder; 2. Spherical tool head; 3. Tool shank; 4. Mounting block; 5. Mounting rod; 6. Seal; 7. Limiting groove; 8. Floating bushing; 9. Shock absorber; 10. Damping medium; 11. Core rod; 12. Spherical protrusion; 13. Micro-protrusion; 14. Rubber elastic layer; 15. Metal sleeve; 16. Connector; 17. Connecting groove; 18. Spiral micro-groove. Detailed Implementation

[0020] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0021] Example 1 Please see Figure 1 - Figure 3 This application provides a vibration-resistant milling cutter for machining curved surfaces, including a cutter shank 1, a floating bushing 8, and a damping rod 9. The cutter shank 1 is equipped with a spherical cutter head 2 for machining curved surfaces via a connector 16. The cutter shank 1, connector 16, and spherical cutter head 2 are integrally formed. The connector 16 has a frustum structure. The diameters of the cutter shank 1, connector 16, and spherical cutter head 2 decrease sequentially, thereby changing the natural frequency of the milling cutter and avoiding superposition with the cutting frequency. The floating bushing 8 is fixedly disposed inside the cutter shank 1. The damping rod 9 is movably disposed inside the floating bushing 8 and is damped by a damping medium 10 to suppress vibration transmission. A damping cavity is provided inside the cutter shank 1 for the operation of the floating bushing 8, the damping rod 9, and the damping medium 10.

[0022] In this embodiment, when the spherical cutter head 2 is moved to the surface to be processed and the cutter bar 1 is controlled to rotate, the spherical cutter head 2 processes the surface. When the cutter bar 1 rotates, the damping rod 9 rotates inside the floating bushing 8, so that the damping rod 9 works in conjunction with the damping medium 10 to dissipate the energy generated when the spherical cutter head 2 is working.

[0023] In this utility model, one end of the tool holder 1 is provided with a tool handle 3 via a mounting block 4; the tool holder 1 is provided with a sealing element 6 for sealing the damping medium 10, and a sealing hole matching the sealing element 6 is provided on the tool holder 1.

[0024] In this embodiment, the seal 6 is removed from the tool holder 1, the damping medium 10 inside the tool holder 1 is replaced, and then the seal 6 is installed on the tool holder 1. The tool holder 1 is aligned with the tool handle 3, so that the mounting block 4 is aligned and fits with the tool handle 3, and the mounting block 4 is fixedly connected to the tool handle 3.

[0025] In this utility model, the knife handle 3 is provided with a limiting groove 7 for sealing and limiting the sealing element 6; the mounting block 4 is provided with mounting rods 5 fixed to the knife handle 3 in a circular array; the knife handle 3 is provided with a plurality of mounting holes for fixing the mounting rods 5.

[0026] In this embodiment, the tool bar 1 is aligned with the tool handle 3, one end of the sealing member 6 is inserted into the limiting groove 7, so that the mounting block 4 is aligned and attached to the tool handle 3, the mounting rod 5 is fixed into the mounting hole, the mounting block 4 is fixedly connected to the tool handle 3, and the tool bar 1 is fixed to the tool handle 3.

[0027] Example 2 Based on Example 1, referring to Figure 3 - Figure 4 This is the second embodiment of the present invention. In this invention, the damping rod 9 includes a core rod 11 and a spherical protrusion 12. The spherical protrusion 12 is disposed inside the floating bushing 8 and its two ends extend out of the floating bushing 8. The spherical protrusion 12 is made of high-density alloy. Through mass inertia, it enhances the relative movement with the tool holder 1. The greater the amplitude of movement, the more energy is dissipated by damping. The core rod 11 is disposed at one end of the spherical protrusion 12 and moves in the damping medium 10. The core rod 11 has a spherical structure and fits against the floating bushing 8. The core rod 11 is made of elastic material and can rotate in the damping medium 10.

[0028] In this embodiment, when the tool bar 1 rotates, it causes the floating bushing 8 to rotate, which in turn causes the mandrel 11 to rotate inside the floating bushing 8. This causes the mandrel 11 and the spherical protrusion 12 to rotate inside the tool bar 1. The mandrel 11 and the spherical protrusion 12 move within the damping medium 10 to dissipate the energy generated by the vibration.

[0029] In this invention, the floating bushing 8 has a through groove for the mandrel 11 to rotate; the mandrel 11 has micro-protrusions 13 arranged in a circular array, with gaps between the micro-protrusions 13 and the through groove, and the micro-protrusions 13 are laser-engraved in rows on the mandrel 11; the micro-protrusions 13 form a micro-air cushion effect on the mandrel 11, which reduces the coefficient of friction compared to a smooth surface, and the micro-protrusions 13 can store a small amount of damping medium 10 to avoid jamming caused by dry friction.

[0030] In this embodiment, when the tool holder 1 rotates, the floating bushing 8 rotates, causing the mandrel 11 to drive the micro-bump 13 to rotate inside the floating bushing 8.

[0031] Example 3 Based on Example 2, referring to Figure 3 - Figure 5 This is the third embodiment of the present invention. In this embodiment, the floating bushing 8 includes a metal sleeve 15 and a rubber elastic layer 14. The metal sleeve 15 is fixedly disposed inside the tool bar 1 and provides movable support for the spherical protrusion 12 through the damping medium 10. The rubber elastic layer 14 is disposed inside the metal sleeve 15 and consumes vibration energy. When the temperature rises and the mandrel 11 expands thermally, the rubber elastic layer 14 can absorb the radial expansion through elastic deformation, stabilizing the mating gap within the range of 0.1 to 0.3 mm. At the same time, the damping characteristics of the rubber elastic layer 14 can additionally consume vibration energy.

[0032] In this embodiment, when the cutter bar 1 rotates, it drives the floating bushing 8 to rotate, which in turn causes the metal sleeve 15 to drive the rubber elastic layer 14 to rotate.

[0033] In this invention, the inner wall of the metal sleeve 15 is provided with a spiral microgroove 18 for storing part of the damping medium 10; the spiral microgroove 18 is connected to the through groove; the spiral microgroove 18 and the damping medium 10 form a synergistic lubrication system; when the core rod 11 undergoes radial displacement, the spiral microgroove 18 can store part of the damping medium 10, forming a continuous oil film lubrication layer to avoid dry friction.

[0034] In this embodiment, when the floating bushing 8 rotates, the metal sleeve 15 drives the spiral microgroove 18 to rotate, which in turn drives the damping medium 10 to rotate, thus transporting the damping medium 10.

[0035] In this utility model, the metal sleeve 15 has a connecting groove 17 that matches the rubber elastic layer 14 inside, and the metal sleeve 15 has a cover that communicates with the connecting groove 17; both the rubber elastic layer 14 and the connecting groove 17 are circular ring structures.

[0036] In this embodiment, the cover is removed, the rubber elastic layer 14 is removed from the connecting groove 17, and the rubber elastic layer 14 is disassembled and replaced.

[0037] The above embodiments are only used to illustrate the technical methods of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of this utility model without departing from the spirit and scope of the technical methods of this utility model.

Claims

1. A shock-resistant milling cutter for machining curved surfaces, characterized in that, include: The tool holder (1) is provided with a spherical tool head (2) for surface machining via a connector (16); A floating bushing (8) is fixedly installed inside the spherical cutter head (2); The damping rod (9) is movably set inside the floating bushing (8) and suppresses vibration transmission through the damping medium (10).

2. The anti-vibration type milling cutter for machining curved surfaces according to claim 1, characterized in that, The shock absorber (9) includes: A spherical protrusion (12) is provided inside the floating bushing (8) and the two ends of the spherical protrusion (12) extend out of the floating bushing (8). The mandrel (11) is located at one end of the spherical protrusion (12) and moves in the damping medium (10).

3. The anti-vibration type milling cutter for machining curved surfaces according to claim 2, characterized in that, The floating bushing (8) has a through groove for the mandrel (11) to rotate; The core rod (11) is provided with micro-bumps (13) arranged in a circular array, and there are gaps between several micro-bumps (13) and the through groove.

4. The anti-vibration type milling cutter for machining curved surfaces according to claim 2, characterized in that, The floating bushing (8) includes: The metal sleeve (15) is fixedly installed inside the tool holder (1) and provides movable support for the spherical protrusion (12) through the damping medium (10); A rubber elastic layer (14) is placed inside the metal sleeve (15) and consumes vibration energy.

5. A shock-resistant milling cutter for machining curved surfaces according to claim 4, characterized in that, The inner wall of the metal sleeve (15) is provided with a spiral microgroove (18) for storing part of the damping medium (10). The spiral microgroove (18) is connected to the through groove.

6. The anti-vibration type milling cutter for machining curved surfaces according to claim 5, characterized in that, The metal sleeve (15) has a connecting groove (17) inside that matches the rubber elastic layer (14). Both the rubber elastic layer (14) and the connecting groove (17) are circular ring structures.

7. The anti-vibration type milling cutter for machining curved surfaces according to claim 1, characterized in that, One end of the tool bar (1) is provided with a tool handle (3) via a mounting block (4); The cutter bar (1) is provided with a sealing element (6) for sealing the damping medium (10).

8. A shock-resistant milling cutter for machining curved surfaces according to claim 7, characterized in that, The tool holder (3) is provided with a limiting groove (7) for sealing and limiting the sealing element (6); The mounting block (4) is provided with mounting rods (5) arranged in a circular array to be fixed to the handle (3).

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