Numerically controlled gantry right-angle side milling head

Abstract

The utility model provides a numerical control gantry right angle side milling head, including the shell, the inside of shell is provided transmission assembly and pivot assembly, and transmission assembly and pivot assembly are vertically arranged, and the output end of transmission assembly and the input end of pivot assembly are with spline mode transmission connection, drive pivot assembly to rotate around its own vertical axis by transmission assembly, the rotatory mode connection between base and shell, the middle part of base is provided with the space for the motion of pivot assembly lower extreme, the adapter kit is connected in pivot assembly lower extreme, and the through groove that is in and out is set up to adapter kit, and sets up the installation slot that corresponds with through groove on pivot assembly, and the one end of milling head passes through through groove and sets up the cooperation with installation slot. The utility model discloses through spline transmission, the rotatory connection of shell and base and tool mounting structure, has solved the milling head clamping difficult, easy overload, precision life damage and the defect such as inconvenient adjustment.

Description

Technical Field

[0001] This utility model relates to the field of CNC machine tool equipment technology, specifically, it demonstrates a CNC gantry right-angle side milling head. Background Technology

[0002] To improve automation, CNC milling and boring machines are typically equipped with various milling heads. For example, the right-angle milling head is usually manually mounted and dismounted, fixed to the end face of the ram, and driven by the machine spindle to rotate. The center line of rotation of the right-angle milling head is at an angle to the center line of rotation of the spindle.

[0003] However, since it is difficult to align the axis of the machine tool milling cutter head with the axis of the right-angle milling head, the right-angle milling head is placed on the worktable plane during clamping. The right-angle milling head is rigidly clamped by repeatedly tapping it, which causes the machine tool milling cutter head to frequently trigger overload alarms. Over time, this can easily reduce the accuracy and lifespan of the machine tool milling cutter head and the right-angle milling head. Utility Model Content

[0004] The purpose of this invention is to provide a CNC gantry right-angle side milling head that is simple to manufacture, distributes water evenly, is not easily clogged, and can generate swirling flow to enhance mixing.

[0005] The technical solution is as follows:

[0006] A CNC gantry right-angle side milling head, comprising:

[0007] The housing contains a transmission assembly and a rotating shaft assembly, which are arranged perpendicularly to each other. The output end of the transmission assembly and the input end of the rotating shaft assembly are connected by a spline, and the transmission assembly drives the rotating shaft assembly to rotate around its own vertical axis.

[0008] The base is located at the lower part of the housing and is rotatably connected to the housing. The middle part of the base has a space for the lower end of the rotating shaft assembly to move.

[0009] The adapter kit is connected to the lower end of the rotating shaft assembly. The adapter kit has a through-slot that runs vertically through the shaft, and the rotating shaft assembly has a mounting slot corresponding to the through-slot. One end of the milling head passes through the through-slot and is inserted into the mounting slot.

[0010] In addition, the above embodiments of this utility model may also have the following additional technical features:

[0011] According to one embodiment of the present invention, the rotating shaft assembly includes a shaft body and several bushings. The bushings are fixedly disposed inside the housing, and the shaft body is movably inserted into the bushings. The outer wall of the shaft body and the bushings are rotatably connected by several bearing components. The shaft body can also move vertically relative to the bushings. This limitation of the rotating shaft assembly achieves adaptive buffering.

[0012] Based on the above technical solution, the lower part of the housing is further provided with an extended tapered sleeve. The interior of the extended tapered sleeve has a first groove, a second groove, and a third groove, each with a gradually narrowing diameter from top to bottom. The lower end of the shaft has two vertically oriented first and second stepped sections. A buffer pad and a buffer spring are respectively fitted onto the lower part of the shaft. The buffer pad is located between the first stepped section and the first groove, and the buffer spring is located between the second stepped section and the second groove. This effectively reduces the impact on the shaft itself and the inner wall of the housing during vertical displacement, improving the service life of key components such as the main shaft bearing.

[0013] Furthermore, the mounting slot is vertically continuous at the center of the shaft, and the centers of the mounting slot, the first slot, the second slot, the third slot, and the through-channel are all on the same straight line. This ensures the coaxiality accuracy of the entire tool transmission path and guarantees machining accuracy.

[0014] According to one embodiment of the present invention, the transmission assembly includes a main shaft, which is rotatably mounted within the housing via several bearing seats. A driving spiral bevel gear is arranged circumferentially along the middle of the main shaft, and a driven spiral bevel gear is arranged at the top of the rotating shaft assembly. The driving and driven spiral bevel gears are meshed together. The spiral bevel gears enable efficient vertical power transmission.

[0015] According to one embodiment of this utility model, the base has two vertically connected annular grooves, a first annular groove and a second annular groove, the width of the first annular groove being smaller than the width of the second annular groove; several connecting rods are provided on the housing, with limiting bodies at the lower ends of the connecting rods, the connecting rods passing through the first annular groove, and the limiting bodies placed within the second annular groove. This allows for flexible rotational connection between the base and the housing, facilitating adjustment of the direction of the milling head during operation.

[0016] Based on the above technical solution, the connecting rod is movably inserted into the housing, and a fastening nut can be threaded onto the upper part of the connecting rod. Loosening the fastening nut allows the housing to be separated from the base, while tightening the fastening nut secures the housing to the base.

[0017] Based on the above technical solution, angle scale lines are evenly arranged around the lower part of the housing, and a pointer pointing to the angle scale lines is provided on the base. This enables fast and accurate angle positioning, and provides a more intuitive angle reference for the rotation of the housing.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. Spline connection is a multi-tooth transmission. Compared with traditional single gear meshing, it has the advantages of large torque capacity, smooth transmission and good centering. Spline connection allows the two parts that transmit power to have relative displacement in the axial direction, providing the milling head with self-adaptive capability. This allows the shaft assembly to produce a small vertical displacement for buffering when subjected to axial force (such as slight misalignment during clamping).

[0020] 2. Operators can easily and quickly rotate the housing (along with the internal transmission and shaft assembly) to adjust the machining angle without disassembling the entire milling head, greatly enhancing flexibility and applicability and improving machining efficiency.

[0021] 3. The cutting tool is inserted directly into the upper mounting slot from below through the groove. The operation is simple and intuitive, which facilitates quick tool change and convenient installation. Attached Figure Description

[0022] Figure 1 This is a cross-sectional schematic diagram of a CNC gantry right-angle side milling head according to an embodiment of the present utility model;

[0023] Figure 2 for Figure 1 A magnified view of part A in the diagram;

[0024] Figure 3 This is a schematic diagram of the meshing of the transmission component and the rotating shaft component according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the rotational connection between the housing and the base in an embodiment of this utility model;

[0026] The relevant markings in the attached diagram are as follows: 1-House, 2-Transmission assembly, 3-Shaft assembly, 4-Base, 5-Adapter kit, 6-Extension tapered sleeve; 11-Connecting rod, 12-Limiting body, 13-Fasting nut, 14-Angle scale line; 21-Main shaft, 22-Bearing seat, 23-Driving spiral bevel gear; 31-Shaft, 32-Shaft sleeve, 33-Driven spiral bevel gear, 311-Mounting slot, 312-First step, 313-Second step; 41-First annular groove, 42-Second annular groove, 43-Pointer; 51-Pass through groove, 61-First groove, 62-Second groove, 63-Third groove, 64-Buffer pad, 65-Buffer spring. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] This utility model embodiment proposes a CNC gantry right-angle side milling head, see reference. Figure 1 As shown, the CNC gantry right-angle side milling head is mainly composed of a housing 1, a transmission assembly 2, a rotating shaft assembly 3, and a base 4.

[0029] The housing 1, as the main structural component of the entire milling head, is typically made of high-strength cast iron or alloy steel through precision machining. Its interior forms a cavity to house and support all core transmission components. The housing design must ensure sufficient rigidity and shock resistance to withstand the complex loads generated during cutting. The lower part of the housing 1 has a downward-facing opening, which is connected by bolts or a flange to a component called an extension tapered sleeve 6. This extension tapered sleeve 6 serves as a guide and buffer support structure at the lower end of the spindle system. On the outer side of the housing 1, near the bottom, there is also a ring of precisely engraved angle markings 14 to indicate the rotation angle of the milling head.

[0030] The transmission assembly 2 is horizontally mounted inside the housing 1. Its core is a spindle 21, which is rotatably supported on the housing 1 by two (or more) bearing seats 22. High-precision angular contact ball bearings or tapered roller bearings are installed in the bearing seats 22 to ensure the radial and axial stiffness of the spindle 21 under high-speed rotation. One end of the spindle 21 (usually the rear end) is designed as a standard interface for connecting to the spindle output end of the CNC machine tool slide and receiving power.

[0031] In the middle of the spindle body 21, a driving spiral bevel gear 23 is fixedly installed. Compared with straight bevel gears, the spiral bevel gear has an involute spiral tooth shape. This design allows the gears to gradually contact and gradually disengage during meshing. At the same time, more teeth participate in meshing, which has the characteristics of smooth transmission, low noise, strong load-bearing capacity and long service life. It is particularly suitable for high-speed and heavy-load milling conditions.

[0032] The rotating shaft assembly 3 is vertically arranged within the housing 1, with its centerline perpendicular to and intersecting the centerline of the main shaft 21 of the transmission assembly 2. The core of the rotating shaft assembly 3 is the shaft 31, which is the vertical spindle that directly drives the tool rotation. This shaft 31 is supported and positioned inside the housing 1 by multiple bushings 32 arranged vertically. High-precision, high-rigidity bearing assemblies (such as angular contact ball bearings) are also installed inside the bushings 32 to ensure that the shaft can rotate smoothly and at high speed. It should be noted that the fit between the shaft 31 and these bushings 32 is not completely rigidly fixed, but allows the shaft to make slight vertical displacements within a certain range along its axial direction (i.e., the vertical direction).

[0033] At the uppermost end of the shaft 31, a driven spiral bevel gear 33 is fixedly installed. This driven spiral bevel gear 33 meshes perpendicularly with the driving spiral bevel gear 23 in the transmission assembly 2, thereby converting horizontal rotational motion into vertical rotational motion. In other words, the power transmission between the driving and driven spiral bevel gears is not achieved through a traditional rigid coaxial connection, but through a spline connection. This spline transmission method has the advantages of high torque transmission and good centering. Specifically, the inner bore of the driving spiral bevel gear may be equipped with a spline, which mates with the external spline at the end of the main shaft; alternatively, the driven spiral bevel gear may also be connected to the shaft below via a spline (such as an involute spline).

[0034] The lower end of the shaft 31 extends downward through the extended tapered sleeve 6 at the bottom of the housing 1. The lower end of the shaft 31 is designed with a precision mounting slot 311, which is usually a standard tool holder interface for mounting the tool holder. The center line of the mounting slot 311, the rotation center line of the shaft 31, and the center line of the extended tapered sleeve 6 must be coaxial.

[0035] Two stepped portions are machined at the lower end of the shaft 31: a first stepped portion 312 at the top and a second stepped portion 313 at the bottom. Correspondingly, a first groove 61, a second groove 62, and a third groove 63 with gradually narrowing diameters from top to bottom are respectively opened inside the extending tapered sleeve 6. A buffer pad 64 and a buffer spring 65 are respectively installed between the first stepped portion 312 and the first groove 61, and between the second stepped portion 313 and the second groove 62. The buffer spring provides a flexible preload, keeping the shaft in an initial position when not in operation. When the shaft is subjected to an upward axial force (such as during clamping), it can compress the spring and move upward. When the clamping force is removed, the spring pushes the shaft back to its original position. The buffer pad serves to buffer and resist wear. This buffer mechanism composed of spring and pad, combined with the spline drive that allows axial floating, constitutes a force adaptive system that can effectively absorb and resolve the impact force caused by alignment errors during installation.

[0036] The base 4 is a component that connects to the end face of the machine tool slide, and is usually fixed to the machine tool slide by bolts or a special tensioning mechanism. In this embodiment, the base 4 has a sufficiently large through hole in the middle to provide movement space for the rotating adapter kit 5 and the cutting tool below, avoiding interference. The upper surface of the base 4 has an annular groove structure, which is formed by two connected layers: the upper layer is the first annular groove 41, which is narrower; the lower layer is the second annular groove 42, which is wider.

[0037] On the lower part of the housing 1, several (usually three or four) connecting rods 11 are evenly distributed circumferentially. The lower end of these connecting rods 11 has a limiting body 12 with a larger diameter. During installation, the connecting rods 11 pass through the annular groove structure on the base 4 from top to bottom until the limiting body 12 at its lower end falls into the wider second annular groove 42. At this time, since the diameter of the limiting body is larger than the width of the narrow annular groove above, it "hangs" the housing on the base. However, the housing can rotate freely relative to the base along with the connecting rods, thereby realizing stepless adjustment of the milling head machining angle.

[0038] Once the angle is adjusted to the correct position (which can be determined by aligning the angle scale on the housing with the pointer fixed on the base; initially, the pointer is aligned with the zero mark on the angle scale), it can be locked using the fastening nut 13. The fastening nut 13 is threaded onto the upper part of the connecting rod 11. Tightening the fastening nut 13 forces the connecting rod 11 to move upward (because the limiting body is held in place by the narrow annular groove, the nut actually presses the housing downward), thereby tightly pressing the housing 1 and the base 4 together through the connecting rod 11, generating a huge frictional torque that firmly locks the housing in the desired angle position. This locking method is simple in structure, quick to operate (only requires tightening a few nuts), has a large locking force, and good rigidity.

[0039] At the lower end of the spindle 31, an adapter kit 5 is installed. This adapter kit 5 has a through-slot 51 running vertically through the spindle. The center line of this through-slot 51 is aligned with the center line of the mounting slot 311 at the center of the spindle 31. When installing a tool, simply pass the tool shank through the through-slot 51 from below and then insert it directly upwards into the mounting slot 311 of the spindle 31. Typically, the automatic tool drawbar mechanism of the machine tool will use a pull rod (not shown in the figure, but a well-known technology in the art) at the center of the spindle to pull the tool shank tightly into the mounting slot, thus completing the clamping. This "through-slot" insertion design makes tool installation and removal very direct and convenient, and is particularly suitable for the operation of automated tool changers.

[0040] The advantages of the right-angle side milling head provided in this embodiment are:

[0041] 1. Installation and Adaptation Process: When installing this right-angle side milling head onto the slide of a CNC machine tool, the operator fixes the base to the end face of the slide. Before final locking, since the shaft of the spindle assembly can float up and down, even if there is a slight non-parallelism between the end face of the slide and the base, the shaft will automatically compensate for this error by moving upward when the slide slowly approaches and applies pressure, instead of generating huge bending moments and resistance like traditional rigid structures. This protects the accuracy and lifespan of the machine tool spindle and the milling head itself.

[0042] 2. Angle Adjustment Process: When it is necessary to change the machining angle, the operator only needs to loosen the fastening nuts on the upper part of several connecting rods in sequence. After loosening, the limiting body at the lower end of the connecting rod falls into the wide annular groove of the base under the action of spring or gravity. At this time, the entire housing (including all internal transmission parts) can be easily rotated by hand or tool. By observing the relative position of the angle scale line on the housing and the pointer on the base, the required angle can be accurately set. After setting, tighten all the fastening nuts to complete the locking. The whole process does not require disassembling the milling head. The operation is simple, fast and accurate, which greatly improves the machining flexibility and efficiency.

[0043] 3. Power transmission and cutting process: After the machine tool spindle is started, the power is transmitted to the driving spiral bevel gear through the spindle body, which in turn drives the driven spiral bevel gear that meshes with it to rotate. The torque is efficiently and smoothly transmitted to the spindle body, which in turn drives the tool installed in the slot at the lower end of the spindle body to perform high-speed rotation cutting. The high rigidity of the spline drive and the smoothness of the spiral bevel gear ensure the stability of the cutting process and the high quality of the machined surface.

[0044] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A CNC gantry right-angle side milling head, characterized in that, include: The housing (1) is equipped with a transmission assembly (2) and a rotating shaft assembly (3) inside the housing (1). The transmission assembly (2) and the rotating shaft assembly (3) are arranged perpendicularly. The output end of the transmission assembly (2) and the input end of the rotating shaft assembly (3) are connected by a spline. The transmission assembly (2) drives the rotating shaft assembly (3) to rotate around its own vertical axis. The base (4) is located at the lower part of the housing (1) and is rotatably connected to the housing (1). The middle part of the base (4) has a space for the lower end of the rotating shaft assembly (3) to move. The adapter kit (5) is connected to the lower end of the shaft assembly (3), and the adapter kit (5) has a through channel (51) that runs vertically through it. The shaft assembly (3) has a mounting slot (311) corresponding to the through channel (51). One end of the milling head passes through the through channel (51) and is inserted into the mounting slot (311).

2. A CNC gantry right-angle side milling head according to claim 1, characterized in that, The rotating shaft assembly (3) includes a shaft body (31) and several bushings (32). The bushings (32) are fixed inside the housing (1). The shaft body (31) is movably inserted into the bushings (32), and the outer wall of the shaft body (31) and the bushings (32) are rotatably connected by several bearing components. The shaft body (31) can also move up and down relative to the bushings (32).

3. A CNC gantry right-angle side milling head according to claim 2, characterized in that, The lower part of the housing (1) is also provided with an extension cone sleeve (6). The interior of the extension cone sleeve (6) is provided with a first groove (61), a second groove (62), and a third groove (63) that gradually narrow from top to bottom. The lower end of the shaft (31) is provided with two first step portions (312) and second step portions (313) that are arranged vertically. The lower part of the shaft (31) is respectively fitted with a buffer pad (64) and a buffer spring (65). The buffer pad (64) is located between the first step portion (312) and the first groove (61), and the buffer spring (65) is located between the second step portion (313) and the second groove (62).

4. A CNC gantry right-angle side milling head according to claim 3, characterized in that, The mounting slot (311) is located vertically through the center of the shaft (31), and the centers of the mounting slot (311), the first slot (61), the second slot (62), the third slot (63), and the channel (51) are all on the same straight line.

5. A CNC gantry right-angle side milling head according to claim 1, characterized in that, The transmission assembly (2) includes a main shaft (21), which is rotatably disposed in the housing (1) via several bearing seats (22). A driving spiral bevel gear (23) is disposed in the middle of the main shaft (21) along its circumference, and a driven spiral bevel gear (33) is disposed on the top of the rotating shaft assembly (3). The driving spiral bevel gear (23) and the driven spiral bevel gear (33) are meshed together.

6. A CNC gantry right-angle side milling head according to claim 1, characterized in that, The base (4) has two vertically connected first annular grooves (41) and second annular grooves (42), the width of the first annular groove (41) is smaller than the width of the second annular groove (42); a number of connecting rods (11) are provided on the housing (1), and a limiting body (12) is provided at the lower end of the connecting rod (11). The connecting rod (11) passes through the first annular groove (41), and the limiting body (12) is placed in the second annular groove (42).

7. A CNC gantry right-angle side milling head according to claim 6, characterized in that, The connecting rod (11) is movably inserted into the housing (1), and the upper part of the connecting rod (11) can be fitted with a fastening nut (13) by means of threaded connection.

8. A CNC gantry right-angle side milling head according to claim 6, characterized in that, Angle scale lines (14) are evenly arranged around the lower part of the housing (1), and a pointer (43) pointing to the angle scale lines (14) is provided on the base (4).

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