Angle milling head rigid connection device for machining center machine tool and installation method

Abstract

The invention relates to the technical field of machine tool accessories and function extension, in particular to an angle milling head rigid connecting device for a machining center machine tool and an installation method, and the angle milling head rigid connecting device comprises a connecting flange which is connected with the end face of a machine tool cutter through a connecting piece to form a rigid installation foundation integrated with a machine tool body; one end of the connecting bracket is detachably connected with the connecting flange, and the other end of the connecting bracket is provided with a connecting port for clamping a fixed-angle milling head body; the angle milling head is rigidly connected with the connecting flange through the connecting bracket, so that the angle milling head becomes a fixed function extension part of a machine tool; a direct and stable force flow transmission path from the angle milling head body to the end face of the machine tool body is constructed through the connecting flange and the connecting support matched with the end face of the machine tool cutter.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of machine tool accessories and function expansion, and particularly relates to a rigid connection device for an angle milling head of a machining center machine tool and a mounting method. BACKGROUND

[0002] In the field of machine tool accessories and function expansion, a machining center can realize multi-angle machining of the side surface, inclined surface and inner cavity of a workpiece by installing an angle milling head (also known as a universal milling head or an angle head), which greatly expands its process range. At present, the commonly used installation method in the industry is to regard the angle milling head as a special "tool", and to use the tool holder clamping mechanism (such as HSK, BT or CAT system) provided on the main shaft of the machine tool to tighten and fix it, that is, the so-called "tool holder suspension type" installation.

[0003] However, this traditional mode of relying on the taper hole of the main shaft for clamping has a series of inherent and difficult-to-overcome technical defects: The main shaft load is too large, and the effective output is limited: in this installation method, the weight of the angle milling head (usually 5 to 15 kg) is completely borne by the main shaft bearing, forming a continuous additional radial load. At the same time, the reaction force generated during cutting also needs to be transmitted through the main shaft. This causes the main shaft to not only output the cutting torque, but also to share a large amount of non-torque load, which not only reduces the effective output capacity of the main shaft, but also accelerates the wear of the main shaft bearing, affecting the long-term precision and service life of the machine tool.

[0004] The connection rigidity is insufficient, and the machining stability is poor: the connection between the tool holder and the taper hole of the main shaft can meet the rigidity requirements of ordinary tools, but for an angle milling head, which has a large mass and overhang length, its ability to resist cutting vibration and cantilever torque is obviously insufficient. When heavy cutting or intermittent cutting is performed, vibration and tool release are likely to occur, directly restricting the improvement of the machining parameters and affecting the surface quality and dimensional accuracy of the workpiece.

[0005] The directional accuracy is dependent on fragile adjustment and is not flexible: the directional positioning of the angle milling head usually relies on the positioning keys or positioning pins on the body, which make line contact or small area contact with the positioning block installed on the end face of the main shaft. This positioning method has a small contact area and is easily worn under repeated assembly and disassembly and stress impact, resulting in a gradual loss of angle positioning accuracy and the inability to compensate. In addition, angle adjustment is usually limited to a few pre-set fixed positions (such as 0°, 90°, 180°, etc.), and cannot achieve continuous and accurate adjustment of any angle, limiting the process flexibility.

[0006] The application scenarios are limited: due to the limitations of rigidity, load and accuracy, the traditional suspension type installation is difficult to meet the requirements of heavy load machining scenarios that require large cutting amount and high stability, and its application is mostly limited to light cutting finishing processes.

[0007] The current method of mounting angle milling heads as "tools" suffers from a fundamental contradiction between load-bearing capacity and connection rigidity, which has become a bottleneck restricting machining centers from realizing their potential and expanding high-performance machining applications. Therefore, the industry urgently needs a new type of connection device that can fundamentally change the mounting concept, transforming the angle milling head from a "spindle-suspended tool" into a "functional component fixed to the machine tool bed," in order to completely solve the above problems. Summary of the Invention

[0008] This invention overcomes the shortcomings of the prior art and provides a rigid connection device for the angle milling head of a machining center, which features high wire feeding efficiency, low labor cost, easy wire protection, and good device adaptability.

[0009] The technical problem solved by this invention can be achieved by the following technical solutions: A rigid connection device for an angle milling head on a machining center machine tool, comprising: The connecting flange is connected to the end face of the machine tool through a connector, forming a rigid mounting base that is integrated with the machine tool bed; A connecting bracket has one end detachably connected to the connecting flange and the other end provided with a connecting port for clamping and fixing the angle milling head body; the angle milling head is rigidly connected to the connecting flange through the connecting bracket, thereby making the angle milling head a fixed functional extension component of the machine tool. Furthermore, the outer contour shape and circumferential dimensions of the connecting flange match the outer contour shape and dimensions of the connecting part of the machine tool cutter end face.

[0010] Furthermore, the connecting bracket is a hollow structure, the outer contour shape and circumferential dimension of the top end of the connecting bracket connected to the connecting flange match the connecting flange, the outer contour shape and circumferential dimension of the bottom end of the connecting bracket connected to the angle milling head match the angle milling head, and the connecting bracket has multiple windows in the middle that communicate with the internal hollow cavity.

[0011] Furthermore, the exterior facade of the window opened in the middle of the connecting bracket is inclined inward along the circumference of the middle of the connecting bracket.

[0012] Furthermore, the axial length of the connecting bracket in its free state is 0.3 mm to 1 mm smaller than the assembly space required between the connecting flange connecting the end face of the machine tool and the angle milling head.

[0013] Furthermore, the connecting component is a connecting screw, and the connecting bracket and the connecting flange connecting to the end face of the machine tool are connected and locked by multiple connecting screws evenly distributed around the circumference, and the connecting bracket and the angle milling head are locked by locking screws.

[0014] Furthermore, the connection interface between the connecting bracket and the angle milling head allows the tool axis direction of the angle milling head to be continuously adjusted within the interface range and locked in place by locking screws.

[0015] Furthermore, the connecting flange and the end face of the machine tool are coaxial during installation.

[0016] Furthermore, a method for installing a rigid connection device for an angle milling head as described in any of the above includes the following steps: S1: Install the machine tool end face connecting flange onto the machine tool cutting end face and correct its coaxiality with the machine tool cutting end face; S2: Pre-assemble the angle milling head and the connecting bracket into a sub-module; S3: Insert the angle milling head holder of the submodule into the end face of the machine tool tool, and initially connect the connecting bracket to the connecting flange; S4: The end face of the machine tool is matched with the control angle milling head holder, and then the connection between the connecting bracket and the connecting flange is locked.

[0017] S5: Use measuring instruments to accurately orient and align the milling cutter axis of the angle milling head, and perform final locking after alignment.

[0018] Furthermore, in step S2, the angle milling head is temporarily fastened to the connecting bracket using a locking screw; in step S4, after the end face of the machine tool and the angle milling head shank cooperate with each other, the locking screw is first loosened, and then the connection between the connecting bracket and the connecting flange is tightened.

[0019] The beneficial effects of this invention are: Compared with existing technologies, the device of this invention uses a "connecting flange on the end face of the machine tool" and a "connecting bracket". For different models of machining centers, only the corresponding interface of the "connecting flange" needs to be replaced; for different brands of angle milling heads, only the corresponding "connecting bracket" needs to be designed or replaced. This "platform-based" design concept makes one method adaptable to almost all machining centers and angle milling heads with standard end faces, with low modification costs and high promotional value.

[0020] This invention establishes a direct and stable force transmission path from the angle milling head body to the machine tool bed end face through a connecting flange and connecting bracket adapted to the machine tool cutter end face. It transforms the traditional "point-to-cone" cantilever connection relying on the spindle taper hole into a "surface-to-surface" rigid connection achieved through a large-area flange surface and multiple bolt groups. This allows the cutting forces and torques to be directly transmitted to the highly rigid machine tool structure, resulting in an order-of-magnitude increase in the overall bending and torsional stiffness of the system. This enables the system to stably withstand heavy-load cutting with high torque and high feed rates, thus expanding the technological capabilities of machining centers.

[0021] The entire weight of the angle milling head of this invention, as well as the main radial cutting force generated during machining, is entirely borne by the rigid connecting flange and connecting bracket and ultimately transmitted to the machine tool bed. The machine tool cutter face only needs to connect to the angle milling head shank through its own connection port to transmit pure torque to drive the cutter rotation, no longer bearing additional bending moment and cantilever load. This effectively avoids abnormal wear, heat generation, and accuracy degradation of the machine tool cutter face caused by additional load, significantly extends the service life of the machine tool cutter face, and allows the machine tool cutter face to exert its maximum torque output capacity under safe operating conditions. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a schematic diagram of the overall assembly structure of the present invention.

[0024] Figure 2 This is a schematic diagram of the overall exploded structure of the present invention.

[0025] In the diagram: 1-Machine tool end face; 2-Connecting flange; 3-Connecting bracket; 4-Angle milling head; 5-Locking screw; 6-Milling cutter; 7-Angle milling head holder. Detailed Implementation

[0026] The technical solution of a rigid connection device for an angle milling head of a machining center provided by the present invention will be described in detail below through several specific embodiments.

[0027] Reference Figure 1 As shown, a rigid connection device for an angle milling head of a machining center includes: Connecting flange 2 is connected to the end face 1 of the machine tool through a connector, forming a rigid mounting base that is integrated with the machine tool bed; The connecting bracket 3 has one end detachably connected to the connecting flange 2, and the other end is provided with a connecting port for clamping and fixing the body of the angle milling head 4; the angle milling head 4 is rigidly connected to the connecting flange 2 through the connecting bracket 3, thereby making the angle milling head 4 a fixed functional extension component of the machine tool.

[0028] Among them, reference Figure 2 As shown, the outer contour shape and circumferential dimensions of the connecting flange 2 match the outer contour shape and dimensions of the connection part of the machine tool cutter end face 1. The purpose is to ensure that the machine tool can operate normally after the device is installed and will not collide with the connecting flange 2.

[0029] The connecting bracket 3 is a hollow structure, formed longitudinally to allow the angle milling head 4 to pass through a channel that matches the end face 1 of the machine tool. The outer contour shape and circumferential dimensions of the top end of the connecting bracket 3, which connects to the connecting flange 2, match the connecting flange 2. The outer contour shape and circumferential dimensions of the bottom end of the connecting bracket 3, which connects to the angle milling head 4, match the angle milling head 4. The connecting bracket 3 has multiple windows in the middle that communicate with the internal hollow cavity. At the same time, the outer facade of the windows in the middle of the connecting bracket 3 is inclined inward along the circumference of the middle of the connecting bracket 3. The purpose of this inward inclination of the windows is to reduce the weight of the connecting bracket 3 and to facilitate the connection of the connecting bracket 3 and the connecting flange 2 with screws. The shape matches the upper and lower connecting flanges 2 and the angle milling head 4 to ensure overall compatibility. In practical applications, the connecting bracket 3 can be used as an adjustable-length intermediate component to connect the flange 2 and different models of angle milling heads 4.

[0030] The contours (such as specific thickness, width, and side cutting edges) of the connecting flange 2 of the present invention that are adapted to the end face 1 of the machine tool have undergone precise anti-interference optimization design to ensure that after the device is installed, the automatic tool magazine and its jaws of the machine tool can operate normally on their original trajectory. The automatic tool magazine and its jaws are existing components of the machine tool, which will not be described in detail in this invention. It completes the exchange of other standard tools, realizes the coexistence of functional expansion and machine tool automation functions, and greatly improves the practical value and production efficiency of the device.

[0031] In this invention, the axial length of the connecting bracket 3 in its free state is 0.3 mm to 1 mm smaller than the assembly space required between the connecting flange 2 and the angle milling head 4 connected to the end face 1 of the machine tool.

[0032] In practical applications, the design length of the connecting bracket 3 is 0.5mm shorter than the theoretical installation distance. As a pre-tightening design, it ensures that a certain assembly stress is generated after locking, eliminating gaps and achieving a true interference fit rather than a simple surface contact.

[0033] In this invention, the connecting component is a connecting screw. The connecting bracket 3 and the connecting flange 2 that connects to the end face 1 of the machine tool are connected and locked by multiple connecting screws evenly distributed around the circumference. The connecting bracket 3 and the angle milling head 4 are locked by locking screws 5.

[0034] The connection interface between the connecting bracket 3 and the angle milling head 4 allows the tool axis direction of the angle milling head 4 to be continuously adjusted within the interface range and locked in place by the locking screw 5.

[0035] Specifically, locking screw 5 is used for initial positioning, and connecting screws are used for final tightening. During installation, a "pre-installation-gripping-final tightening" process is used, utilizing the connection point of the machine tool cutter end face 1 as a temporary positioning aid. Finally, the locking screw 5 and connecting screws firmly press the angle milling head 4, connecting bracket 3, connecting flange 2, and machine tool cutter end face 1 into a single unit. It is required that the connecting flange 2 and the machine tool cutter end face 1 be coaxial during installation to ensure overall rigidity after connection.

[0036] In this invention, the top of the angle milling head 4 is an angle milling head shank 7. The angle milling head 4 passes through the angle milling head shank 7 through the connecting bracket 3 and the connecting flange 2 and cooperates with the end face 1 of the machine tool. A milling cutter 6 is provided on the bottom outer wall of the angle milling head 4.

[0037] A method for installing a rigid connection device for an angle milling head according to the present invention includes the following steps: S1: Install the machine tool end face connecting flange 2 onto the machine tool tool end face 1, and correct its coaxiality with the machine tool tool end face 1; S2: Pre-assemble the angle milling head 4 and the connecting bracket 3 into a sub-module; S3: Insert the angle milling head holder 7 of the submodule into the end face 1 of the machine tool, and initially connect the connecting bracket 3 and the connecting flange 2; S4: Control the angle of the milling head holder 7 to match the machine tool end face 1, and then lock the connection between the connecting bracket 3 and the connecting flange 2.

[0038] S5: Use a measuring instrument to precisely orient and align the axis of the milling cutter 6 of the angle milling head 4, and then perform final locking after alignment. The measuring instrument used in this invention for precisely orienting and aligning the axis of the milling cutter 6 of the angle milling head 4 is a dial indicator. The machine tool axes are moved to precisely align the axis of the milling cutter 6 of the angle milling head. If any prior art instrument can be used to precisely orient and align the axis of the milling cutter 6 of the angle milling head 4 according to this invention, it falls within the protection scope of this invention.

[0039] In step S2 of this invention, the angle milling head 4 and the connecting bracket 3 are temporarily fastened using locking screws 5; in step S4, after the machine tool cutter end face 1 and the angle milling head shank 7 are engaged, the locking screws 5 are loosened first, and then the connection between the connecting bracket 3 and the connecting flange 2 is tightened. The overall rigidity is improved after the connection is achieved by this method.

[0040] The following describes the rigid connection device and installation method of the angle milling head for machining center machine tools of the present invention, using the example of installing an Italian OMG angle milling head (weighing 12kg) on ​​a HERMLEC 1200U five-axis machining center to machine the inner wall of a deep cavity of a certain part.

[0041] Its working principle is: Preliminary preparations: Remove the positioning block system that comes with the OMG Angle Milling Head 4 and the flange cover used for conventional installation.

[0042] Install the connecting flange 2 of this invention: Measure the end face 1 of the HERMLEC 1200U machine tool and, using its 10 M5 standard screw holes (remove the 4 symmetrical original screws), install the custom-machined 19mm thick connecting flange 2. Adjust using a precision mandrel and dial indicator (both are existing technologies and will not be described in detail here). Ensure the coaxiality between the center hole of the connecting flange 2 and the rotation center of the machine tool end face 1 is ≤0.05mm, then tighten all connecting screws.

[0043] The OMG angle milling head 4 is fastened to the specially designed connecting bracket 3 with locking screws 5 to form an integral sub-module.

[0044] Then, preliminary connection and fine-tuning are performed: Insert the angle milling head holder 7 from this submodule into the end face 1 of the machine tool to match it.

[0045] Pre-connect the connecting bracket 3 and the connecting flange 2 with connecting screws, but leave a gap of about 0.5mm.

[0046] The machine tool tool end face 1 is activated to grip the angle milling head shank 7. At this time, the accurate spatial position of the angle milling head 4 sub-module is initially determined by the connection point of the machine tool tool end face 1.

[0047] Loosen the pre-connected locking screws, at which point the sub-module, namely the angle milling head 4 and the connecting bracket 3, can float within a small range.

[0048] Tighten the connecting screws between the connecting bracket 3 and the connecting flange 2 thoroughly to achieve rigid locking.

[0049] Final Orientation and Locking: Install a dial indicator at the milling cutter 6, move each axis of the machine tool, and precisely align the parallelism between the axis of the milling cutter 6 of the angle milling head 4 and the X-axis of the machine tool. After achieving the target alignment, finally tighten all the connecting screws on the connecting bracket 2 to complete the entire installation.

[0050] Actual cutting verification showed that the modified machine has extremely high overall rigidity and can withstand cutting parameters far exceeding those of the past. The surface quality and dimensional accuracy of the machined inner wall fully meet the requirements, and the automatic tool change function of the machine tool operates smoothly without any interference.

[0051] In summary, the rigid connection device and installation method for angle milling heads on machining centers according to the present invention are based on the core components of the "connecting flange on the machine tool end face" and the "connecting bracket". For different models of machining centers, only the corresponding interface of the "connecting flange" needs to be replaced; for different brands of angle milling heads, only the corresponding "connecting bracket" needs to be designed or replaced. This "platform-based" design concept allows one method to be adapted to almost all machining centers and angle milling heads with standard end faces, resulting in low modification costs and high promotional value.

[0052] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention, and all such changes are within the protection scope of the technology.

[0053] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0054] The technical solutions of the various embodiments can be combined with each other, but must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

Claims

1. A rigid connection device for an angle milling head on a machining center, characterized in that, include: The connecting flange (2) is connected to the end face (1) of the machine tool through the connecting parts, forming a rigid mounting base that is integrated with the machine tool bed; The connecting bracket (3) has one end detachably connected to the connecting flange (2) and the other end is provided with a connection port for clamping the body of the angle milling head (4); the angle milling head (4) is rigidly connected to the connecting flange (2) through the connecting bracket (3), so that the angle milling head (4) becomes a fixed functional extension component of the machine tool.

2. The rigid connection device for an angle milling head of a machining center according to claim 1, characterized in that: The outer contour shape and circumferential dimensions of the connecting flange (2) match the outer contour shape and dimensions of the connecting part of the machine tool end face (1).

3. A rigid connection device for an angle milling head on a machining center according to claim 1 or 2, characterized in that: The connecting bracket (3) is a hollow structure. The outer contour shape and circumferential dimension of the top end of the connecting bracket (3) connected to the connecting flange (2) match the connecting flange (2). The outer contour shape and circumferential dimension of the bottom end of the connecting bracket (3) connected to the angle milling head (4) match the angle milling head (4). The connecting bracket (3) has multiple windows in the middle that communicate with the internal hollow cavity.

4. A rigid connection device for an angle milling head on a machining center according to claim 3, characterized in that: The outer facade of the window opened in the middle of the connecting bracket (3) is inclined inward along the circumferential direction of the middle of the connecting bracket (3).

5. A rigid connection device for an angle milling head on a machining center according to claim 1, characterized in that: The axial length of the connecting bracket (3) in its free state is 0.3 mm to 1 mm smaller than the assembly space required between the connecting flange (2) that connects to the end face of the machine tool (1) and the angle milling head (4).

6. A rigid connection device for an angle milling head on a machining center according to claim 1, characterized in that: The connecting component is a connecting screw. The connecting bracket (3) and the connecting flange (2) connecting the machine tool cutter end face (1) are connected and locked by multiple connecting screws evenly distributed around the circumference. The connecting bracket (3) and the angle milling head (4) are locked by locking screws (5).

7. A rigid connection device for an angle milling head on a machining center according to claim 6, characterized in that: The connection interface between the connecting bracket (3) and the angle milling head (4) allows the tool axis direction of the angle milling head (4) to be continuously adjusted within the interface range and locked in place by the locking screw (5).

8. A rigid connection device for an angle milling head on a machining center according to claim 1, characterized in that: The connecting flange (2) and the end face (1) of the machine tool are coaxial during installation.

9. A method for installing the rigid connection device for an angle milling head as described in any one of claims 1-8, characterized in that, Includes the following steps: S1: Install the machine tool end face connecting flange (2) onto the machine tool tool end face (1) and correct its coaxiality with the machine tool tool end face (1); S2: The angle milling head (4) and the connecting bracket (3) are pre-assembled into a sub-module; S3: Insert the angle milling head holder (7) of the submodule into the end face (1) of the machine tool tool, and make a preliminary connection between the connecting bracket (3) and the connecting flange (2); S4: Control the angle milling head holder (7) to cooperate with the end face (1) of the machine tool, and then lock the connection between the connecting bracket (3) and the connecting flange (2). 10.S5: Use a measuring instrument to accurately orient and align the milling cutter (6) axis of the angle milling head (4), and perform final locking after alignment.

11. The installation method according to claim 9, characterized in that, In step S2, the angle milling head (4) and the connecting bracket (3) are temporarily fastened using locking screws (5); in step S4, after the machine tool end face (1) and the angle milling head handle (7) cooperate with each other, the locking screws (5) are loosened first, and then the connection between the connecting bracket (3) and the connecting flange (2) is tightened.

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