A special purpose curved arm milling arbor device

Abstract

The utility model discloses a special curved arm milling cutter bar device, it includes numerical control connecting seat, curved arm tool holder, flexible axle, right angle milling head, transition cover, worm wheel and worm, one side of numerical control connecting seat is fixed with curved arm tool holder one end, and the other end of curved arm tool holder is fixed with a transition cover, and the inside of transition cover has a worm wheel, and the outside is equipped with a worm that is engaged with worm wheel, and one side of worm wheel is fixed with a right angle milling head, right angle milling head also includes bevel gear A, bevel gear B, milling cutter shaft, milling cutter head and bearing, and the inside of right angle milling head is equipped with a plurality of bearings, and milling cutter shaft is installed in the bearing, and bevel gear B is fixed on one end of milling cutter shaft, and milling cutter head is fixed on the other end of milling cutter shaft, and bevel gear A is installed in right angle milling head and is engaged with bevel gear B, bevel gear A is fixed with the other end of flexible axle, and the other end of flexible axle is fixed with numerical control machine tool main shaft. The device can be inserted into the inside of cavity, and the circular radial milling machining is carried out through fitting cavity curve path as the working path.

Description

Technical Field

[0001] This utility model relates to a special articulated arm milling cutter holder device, belonging to the field of mechanical technology. Background Technology

[0002] Since both outer ends of the impeller have sealing plates, the cavity channel is approximately a curved path in space. Therefore, it is difficult to machine the inner cavity using general machining methods. Even CNC machining centers with multi-axis linkage cannot insert the tool into the narrow curved cavity for machining, making the machining difficult. Moreover, the existing impeller structures are all cast, and the roughness and protrusions on the impeller surface cannot be repaired. Utility Model Content

[0003] To overcome the shortcomings of the existing technology, this utility model provides a special curved arm milling cutter bar device. The curved arm milling cutter bar can extend into the cavity and perform circumferential radial milling by fitting the cavity curve path as the working path. It can complete the rough and fine milling processes of the inner and outer cavity arc surfaces and spatial three-dimensional curved surfaces.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a special crank arm milling cutter holder device, including a CNC connecting seat, a crank arm cutter holder, a flexible shaft, a right-angle milling head, a transition sleeve, a worm gear, and a worm. One side of the CNC connecting seat is fixedly connected to one end of the crank arm cutter holder, and the other end of the crank arm cutter holder is fixedly installed with a transition sleeve. A worm gear is installed inside the transition sleeve, and a worm is provided on one side of the outer side of the transition sleeve. The worm and the worm gear are meshed and connected. A right-angle milling head is fixedly installed on one side of the worm gear. The right-angle milling head includes a bevel gear A, a bevel gear B, a milling cutter shaft, and a milling cutter. The right-angle milling head contains several bearings, with the milling cutter shaft mounted within them. Bevel gear B is fixedly mounted at one end of the milling cutter shaft, and the milling cutter head is fixedly mounted at the other end, protruding from the right-angle milling head. Bevel gear A is mounted within the right-angle milling head and meshes with bevel gear B. A flexible shaft is located within the crank arm tool holder, with one end fixedly mounted to bevel gear A and the other end fixedly mounted to the spindle of the CNC machine tool. The flexible shaft is composed of several universal joints. The CNC connecting seat has several mounting holes for connecting to the front end of the square slide block of a dedicated boring machine.

[0005] On the side adjacent to the worm, a pull-out locking block is provided at the tail of the transition sleeve. The locking block can be inserted into the worm, and the worm and the locking block are arranged at a right angle. Angular dimension lines are engraved at the connection between the right-angle milling head and the transition sleeve and the crank arm tool holder.

[0006] The beneficial effects of this utility model are as follows: This utility model adopts a curved elbow arm structure design, which is composed of a curved arm tool holder and an indexable milling head. It is suitable for configuring carbide inserts on indexable milling tools for machining stainless steel workpieces. It can complete rough and finish milling operations on internal and external cavities, arc surfaces, and three-dimensional curved surfaces. This utility model is a special milling tool holder developed for machining workpieces with special structures. It can be connected to CNC equipment to expand its machining functions in special spatial positions. It can withstand high-load milling work. The tool holder has high dynamic and static stiffness, and all main and auxiliary movements are safe and reliable with a long service life. This utility model uses 3D CAD modeling to complete the optimized design of the structure, and achieves powerful, high-speed, and multi-angle milling functions in terms of structural performance. Attached Figure Description

[0007] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0008] Figure 1 This is a schematic diagram of the structure of this utility model.

[0009] Figure 2 yes Figure 1 Top view.

[0010] Figure 3 This is a structural schematic diagram of the right-angle milling head of this utility model.

[0011] Figure 4 This is a schematic diagram of the flexible shaft of this utility model.

[0012] Figure 5 This is the front view of the impeller.

[0013] Figure 6 yes Figure 5 A schematic diagram of the Z-Z direction.

[0014] Figure 7 This is a schematic diagram of the present invention in operation.

[0015] Numbering on the map: 1. CNC connecting seat, 2. Crank arm tool holder, 3. Flexible shaft, 4. Right angle milling head, 5. Bevel gear A, 6. Bevel gear B, 7. Milling cutter shaft, 8. Milling cutter head, 9. Bearing, 10. Transition sleeve, 11. Worm gear, 12. Worm, 13. Clamping block, 14. Impeller. Detailed Implementation

[0016] like Figure 1As shown in Figure 7, a dedicated articulated arm milling cutter holder device includes a CNC connecting seat 1, an articulated arm tool holder 2, a flexible shaft 3, a right-angle milling head 4, a transition sleeve 10, a worm gear 11, and a worm 12. One side of the CNC connecting seat 1 is fixedly connected to one end of the articulated arm tool holder 2, and the other end of the articulated arm tool holder 2 is fixedly installed with a transition sleeve 10. A worm gear 11 is installed inside the transition sleeve 10, and a worm 12 is provided on one side of the outer side of the transition sleeve 10. The worm 12 is meshed with the worm gear 11, and a right-angle milling head 4 is fixedly installed on one side of the worm gear 11. The right-angle milling head 4 includes a bevel gear A5, a bevel gear B6, a milling cutter shaft 7, and a milling cutter head 8. The right-angle milling head 4 contains several bearings 9, the milling cutter shaft 7 is installed in the bearings 9, the bevel gear B6 is fixedly installed at one end of the milling cutter shaft 7, the milling cutter head 8 is fixedly installed at the other end of the milling cutter shaft 7, the milling cutter head 8 protrudes from the right-angle milling head 4, and the bevel gear A5 is installed in the right-angle milling head 4 and meshes with the bevel gear B6; the crank arm tool holder 2 contains a flexible shaft 3, one end of which is fixedly installed with the bevel gear A5, and the other end of which is fixedly installed with the spindle of the CNC machine tool. The flexible shaft 3 is composed of several universal joints; the CNC connecting seat 1 has several mounting holes for connecting to the front end of the square slide block of the special boring machine.

[0017] On the side adjacent to the worm 12, the tail of the transition sleeve 10 is provided with a pull-out clamping block 13. The clamping block 13 can be inserted into the worm 12. The worm 12 and the clamping block 13 are arranged at right angles. Angle dimension lines are engraved at the connection between the right-angle milling head 4, the transition sleeve 10 and the crank arm tool holder 2.

[0018] This dedicated articulated arm milling cutter holder is used as an auxiliary head. It is installed on the front end of the square slide of a dedicated boring machine. The CNC connecting seat 1 of the dedicated articulated arm milling cutter holder is fixed to the front end of the square slide of the dedicated boring machine by bolts. The dedicated boring machine model is TK6916 or TK6913. This dedicated articulated arm milling cutter holder can also be connected to an end milling machine.

[0019] This articulated arm milling cutter holder adopts a thermally symmetrical structure and a curved elbow arm layout. It consists of a CNC connecting seat 1 (as a CNC connection part), an articulated arm cutter holder 2, and an indexable right-angle milling head 4, forming a curved arm structure. All components have been calculated using the finite element method, giving the overall cutter holder composed of the articulated arm cutter holder 2 and the right-angle milling head 4 high strength, connection rigidity, and vibration resistance. In use, this dedicated articulated arm milling cutter holder device can be installed at the front end of a CNC floor-mounted boring and milling head via the CNC connecting seat 1. It uses an end face key and a 7:24 taper fit, and is firmly locked to the boring and milling head by pull studs. The machine tool's CNC function is used to realize the X, Y, and Z axis feed motion of the cutter holder. The tool can be controlled to move along the inner side curve of the cavity through CNC programming and interpolation of each axis to meet the contour milling of the inner curved surface of the impeller 14 cavity.

[0020] The main drive for milling in the dedicated articulated arm milling cutter holder is transmitted by the spindle of the CNC machine tool. The spindle drives the bevel gear A5 to rotate via the flexible shaft 3 of the universal joint structure. The bevel gear A5 drives the meshing bevel gear B6 and the milling cutter shaft 7 to rotate under the support of the upper and lower bearings 9. The milling cutter shaft 7 simultaneously drives the milling cutter head 8 to rotate. In this way, the spindle of the machine tool drives the internal gear set of the articulated arm to transmit power sequentially to the milling cutter head 8. Through gear reversal, the tool axis is made perpendicular to the inner curved surface of the impeller 14. The right-angle milling head 4 can rotate along the axis of the tool holder. The operation is manual. When rotating, the clamping block 13 needs to be loosened. The working angle is adjusted by the worm gear 11 and the worm 12. The worm 12 drives the worm gear 11 to rotate the right-angle milling head 4. After the angle is adjusted, the clamping block 13 is re-inserted into the worm 12 to lock the right-angle milling head 4. The right-angle milling head 4 and the transition sleeve 10 are engraved with angle dimension lines at the connection between them and the crank arm tool holder 2. After each axial machining of the curve is completed, the tool angle is adjusted manually to enter the machining of the next curve. After multiple machining operations, the milling of the entire cavity can be completed.

[0021] Because the internal cavity space of the impeller 14 is small, with a width of only 66mm at its narrowest point, the diameter of the milling head 8 in the right-angle milling head at the front end of the crank arm tool holder 2 must be ≤60mm, and the length of the straight section must be ≤80mm. Therefore, only a small-sized connected indexable tool head structure can be selected. The diameter of the selected insert is φ12mm, and the diameter of the tool holder is φ12mm. Then, the process parameters are determined according to the machining process. It is known that the workpiece material of the impeller 14 is stainless steel with a material hardness of HB≤270. Then the tool can be set as follows: feed rate f=0.1-0.2mm / r, depth of cut ap≤0.6mm, cutting speed V=70-150m / min, and the insert grade YBG252 indexable finish milling insert is pre-selected.

[0022] This dedicated articulated arm milling cutter holder uses 3D CAD modeling to optimize its structure. In terms of structural performance, it achieves powerful, high-speed, and multi-angle milling functions. It is equipped with advanced domestic and foreign functional parts and accessories, making it a high-performance dedicated auxiliary tool with high processing efficiency.

Claims

1. A special purpose curved-arc milling tool arbor apparatus, characterized by: The system includes a CNC connector (1), a crank arm tool holder (2), a flexible shaft (3), a right-angle milling head (4), a transition sleeve (10), a worm gear (11), and a worm (12). One side of the CNC connector (1) is fixedly connected to one end of the crank arm tool holder (2), and the other end of the crank arm tool holder (2) is fixedly installed with a transition sleeve (10). A worm gear (11) is installed inside the transition sleeve (10), and a worm (12) is provided on the outer side of the transition sleeve (10). The worm (12) meshes with the worm gear (11), and a right-angle milling head (4) is fixedly installed on one side of the worm gear (11). The right-angle milling head (4) includes a bevel gear A (5), a bevel gear B (6), a milling cutter shaft (7), and a milling cutter head (8). The right-angle milling head (4) is equipped with several bearings (9), the milling cutter shaft (7) is installed in the bearings (9), the bevel gear B (6) is fixedly installed at one end of the milling cutter shaft (7), the milling cutter head (8) is fixedly installed at the other end of the milling cutter shaft (7), the milling cutter head (8) protrudes from the right-angle milling head (4), the bevel gear A (5) is installed in the right-angle milling head (4) and meshes with the bevel gear B (6); a flexible shaft (3) is provided in the crank arm tool holder (2), one end of the flexible shaft (3) is fixedly installed with the bevel gear A (5), and the other end of the flexible shaft (3) is fixedly installed with the spindle of the CNC machine tool; the CNC connecting seat (1) is provided with several mounting holes that connect to the front end of the square slide of the special boring machine.

2. A special purpose curved arm tool bar apparatus as claimed in claim 1, wherein: The flexible shaft (3) is composed of several universal joints.

3. A special purpose curved arm tool bar apparatus as defined in claim 1 wherein: On the side adjacent to the worm (12), the tail of the transition sleeve (10) is provided with a pull-out clamping block (13), which can be inserted into the worm (12). The worm (12) and the clamping block (13) are arranged at right angles.

4. The dedicated crank arm milling cutter holder device according to claim 1, characterized in that: Angle dimension lines are engraved at the connection points of the right-angle milling head (4) and the transition sleeve (10) with the crank arm tool holder (2).

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