Miniature numerical control hydraulic drive double-end milling cutter clamping cutter handle

Abstract

The utility model relates to the technical field of micro numerical control machining, and discloses a micro numerical control hydraulic drive double-end milling cutter clamping cutter handle which comprises a double-end cutter handle, a drive impeller, a rod milling cutter and a thread milling cutter. The precision error and time consumption caused by secondary clamping and alignment among different devices are avoided, the technological process is reduced, and therefore the machining efficiency is remarkably improved. Meanwhile, due to the fact that the problem of electrode loss in the electric spark machining process is avoided, the machining stability is remarkably improved.

Description

Technical Field

[0001] This utility model belongs to the field of micro CNC machining technology, specifically relating to a micro CNC hydraulically driven double-ended milling cutter holder. Background Technology

[0002] In the field of micro CNC machining technology, there is often a need for precision machining of multi-directional pipe interfaces inside workpieces. Due to limited machining space, such as a cavity structure with a diameter of 118mm and a height of 52mm, existing milling cutter holders are unable to handle the machining of threaded holes at specific angles. Specifically, for the machining of the end face, bottom hole, and thread of M12x1 threaded holes, conventional CNC equipment is prone to secondary clamping errors, complex process flow, and low efficiency. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned problems and provide a micro CNC hydraulically driven double-ended milling cutter holder that can realize milling in a limited space while improving machining accuracy and efficiency.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This utility model provides a micro CNC hydraulically driven double-head milling cutter clamping shank, including a double-head shank, one end of which is fixedly connected to an end cap, and a driving mechanism is provided inside the double-head shank;

[0006] The drive mechanism includes a drive impeller, and a bearing is provided inside the double-ended tool holder. The drive impeller and the bearing are installed inside the double-ended tool holder by interference fit of a bar end mill and a thread end mill. A hydraulic oil inlet and a hydraulic oil outlet are provided on the outer wall of the double-ended tool holder.

[0007] A further improvement of this invention is that the bearing is a self-sealing bearing.

[0008] A further improvement of this utility model is that the double-headed handle, end cap and drive impeller are all made of 40Cr steel and have undergone quenching and tempering treatment, with a hardness of HRC32-36.

[0009] A further improvement of this invention is that the hydraulic oil inlet and hydraulic oil outlet are respectively connected to the hydraulic workstation via flexible pipelines.

[0010] A further improvement of this invention is that an O-ring is provided on the outer wall of the double-ended tool holder.

[0011] A further improvement of this invention is that the O-ring is made of nitrile rubber.

[0012] A further improvement of this utility model is that the double-headed handle and the end cap are connected by screws, and the inner surface of the end cap is provided with a mounting groove that matches the drive impeller.

[0013] A further improvement of this invention is that the screws are made of alloy steel, and the number of screws is four.

[0014] A further improvement of this invention is that both the bar end mill and the thread end mill are made of high-speed tool steel.

[0015] A further improvement of this invention is that the number of driving impellers is two, which are respectively installed at both ends of the double-headed tool holder.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This invention provides a miniature CNC hydraulically driven double-ended milling cutter holder. By integrating the drive mechanism and the double-ended milling cutter, it can adapt to the machining needs of limited spaces. This not only avoids the accuracy errors and time consumption caused by secondary clamping and alignment between different devices, but also reduces the process flow, thus significantly improving machining efficiency. Simultaneously, by avoiding the electrode wear problem in electrical discharge machining, machining stability is also significantly improved. Attached Figure Description

[0018] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the present invention and do not specifically limit the shapes and proportions of the components of the present invention.

[0019] Figure 1 Main view of the clamping shank structure for a micro CNC hydraulically driven double-ended end mill;

[0020] Figure 2 for Figure 3 Schematic diagram of section AA;

[0021] Figure 3 This is a schematic diagram of a micro CNC hydraulically driven double-ended milling cutter holder.

[0022] The components include: 1. Double-ended tool holder; 2. End cap; 3. Drive impeller; 4. Bearing; 5. Sealing ring; 6. Screw; 7. Bar milling cutter; 8. Thread milling cutter; 9. Hydraulic oil inlet; 10. Hydraulic oil outlet. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] The present invention will now be described in further detail with reference to the accompanying drawings:

[0030] like Figure 1 and Figure 2 As shown, this utility model provides a miniature CNC hydraulically driven double-ended milling cutter holder, including a double-ended holder 1, an end cap 2, a drive impeller 3, a bearing 4, a sealing ring 5, a screw 6, a bar milling cutter 7, a thread milling cutter 8, a hydraulic oil inlet 9, and a hydraulic oil outlet 10; wherein one end of the double-ended holder 1 is fixedly connected to the end cap 2, and the end cap 2 and the double-ended holder 1 are fixedly connected by the screw 6, and both ends of the double-ended holder 1 are respectively provided with interfaces for installing milling cutters, and the end cap 2 is used to close the interfaces at this end and protect the internal parts.

[0031] The double-ended tool holder 1 is equipped with a drive mechanism, which includes a drive impeller 3. The drive impeller 3 and the bearing 4 are installed inside the double-ended tool holder 1 through an interference fit between the bar end mill 7 and the thread end mill 8. The impeller 3 can rotate under hydraulic drive. The bar end mill 7 and the thread end mill 8 are used to process the end face, bottom hole and thread of the sealing thread, respectively. The drive impeller 3 is connected to the end mill through a transmission mechanism, which can ensure that the drive impeller 3 drives the end mill to rotate synchronously when it rotates.

[0032] The outer wall of the double-ended tool holder 1 is provided with a hydraulic oil inlet 9 and a hydraulic oil outlet 10. The hydraulic oil inlet 9 and the hydraulic oil outlet 10 are respectively connected to the hydraulic workstation of the machining center through flexible pipelines to provide hydraulic power to the drive mechanism.

[0033] As a preferred option, the specifications of the bar end mill 7 are φ5×φ47×4, and the specifications of the thread end mill 8 are M12×1.

[0034] As a preferred option, the double-ended tool holder 1, end cap 2, and drive impeller 3 are all made of 40Cr steel and have undergone quenching and tempering treatment, with a hardness of HRC32-36 or HB300-340. This ensures the stability and accuracy of the double-ended tool holder 1 under high-speed and heavy-load cutting, extends the service life of the double-ended tool holder 1, reduces the replacement frequency, and improves production efficiency. The high strength of 40Cr steel ensures the stability of the end cap 2 under high pressure, making it less prone to deformation or breakage. The quenched and tempered 40Cr steel has high wear resistance, which can reduce the wear of the drive impeller 3 under long-term operation and extend its service life.

[0035] As a preferred option, bearing 4 is a self-sealing bearing with specifications of φ5×φ14×5, used to prevent hydraulic oil leakage.

[0036] The outer wall of the double-ended tool holder 1 is also provided with an O-ring seal 5 to enhance the sealing performance at the connection between the double-ended tool holder 1 and the machining center.

[0037] As a preferred option, the O-ring 5 is made of nitrile rubber, with a specification of 95B, and is used to prevent hydraulic oil leakage.

[0038] As a preferred option, the bar end mill 7 and the thread end mill 8 are made of high-speed tool steel, which has high hardness and wear resistance.

[0039] Hydraulic oil inlet 9 and hydraulic oil outlet 10 are respectively located on both sides of the double-ended tool holder 1 to facilitate connection to the flexible pipeline of the hydraulic workstation.

[0040] The end cap 2 is fixedly connected to the double-ended handle 1 by screws 6, and the inner surface of the end cap 2 is provided with a mounting groove that matches the drive impeller 3 to ensure the stable installation of the drive impeller 3.

[0041] As a preferred option, screw 6 has a specification of M6×12~16.

[0042] There are two drive impellers 3, which are installed at both ends of the double-ended tool holder 1, and the two drive impellers 3 rotate synchronously through the bearing 4; the two drive impellers 3 rotate in opposite directions to drive the bar end mill 7 and the thread end mill 8 to perform machining respectively.

[0043] It should be noted that the design dimensions of the double-ended tool holder 1 take into account the need to machine M12×1 threaded holes in a limited space, so as to ensure that it has sufficient operating space during the machining process and avoids interference with the workpiece.

[0044] The specific steps for implementing the micro CNC hydraulically driven double-ended end mill holder of this utility model are as follows:

[0045] Step 1: Based on the actual spatial dimensions of the #4 sealing threaded hole (M12×1) in the workpiece, design the maximum outer contour dimensions of the micro CNC hydraulic drive double-ended milling cutter clamping shank (with a safety margin of approximately >1mm on each side), and simulate machining on a computer to prevent interference between the double-ended shank 1 and the workpiece;

[0046] Step 2: Calculate the overall rigidity of the clamping shank of the micro CNC hydraulically driven double-ended milling cutter based on the physical and chemical properties of the workpiece material after heat treatment;

[0047] Step 3: Based on the calculated overall rigidity of the micro CNC hydraulic drive double-ended milling cutter holder, select the material and heat treatment status of the double-ended holder 1, drive impeller 3, and end cap 2, as shown in Table 1; select the type and specifications of the self-sealing bearing 4 and O-ring 5, as shown in Table 1; the auxiliary hydraulic drive unit utilizes the hydraulic workstation built into the machining center to drive the impeller to drive the milling cutter to process the workpiece.

[0048] Step 4: Based on the part acceptance accuracy of the workpiece, determine the machining accuracy of each component of the micro CNC hydraulic drive double-ended milling cutter holder and the overall accuracy after assembly, as well as the acceptance equipment and methods;

[0049] Step 5: Draw part drawings based on the machining accuracy of double-headed tool holder 1, drive impeller 3, and end cover 2. All materials are 40Cr, and the heat treatment state of the materials is quenching and tempering, HRC32-36.

[0050] Step 6: After assembling the precision-machined and inspected components, bearings 4, O-rings 5, etc., according to the assembly drawing, they are measured on a Zeiss three-coordinate measuring machine. After passing the measurement, they are used for workpiece processing. Compressed air is used to test the sealing performance of the assembled micro CNC hydraulic drive double-end mill cutter holder and to verify the rotation function of the drive impeller 3.

[0051] Table 1. Component List of Micro CNC Hydraulic Driven Double-End Mill Holder

[0052]

[0053] Example 1

[0054] like Figure 3 As shown, this embodiment takes the machining of the No. 4 sealing threaded hole (M12×1) in the inner cavity of the workpiece as an example. The inner cavity space of this part is only (Φ118×52, unit: mm). The original process route is: precision turning datum + machining center + electrical discharge machining. Now, the micro CNC hydraulically driven double-ended milling cutter of this utility model is used to hold the tool holder. The specific steps are as follows:

[0055] Step 1: After precision machining and clamping the workpiece to the reference, fix it precisely on the precision CNC rotary table, and use conventional milling cutters to machine other parts except for the No. 4 sealing thread hole.

[0056] Step 2: Secure the clamping bar of the micro CNC hydraulically driven double-ended milling cutter using the elastic collet built into the standard tool holder of the machining center;

[0057] Step 3: Use a dial indicator to align the alignment edge of the micro CNC hydraulic drive double-ended milling cutter holder with the Y-axis of the machining center, and lock the rotation function of the Z-axis to ensure that the alignment edge of the micro CNC hydraulic drive double-ended milling cutter holder is parallel to the Y-axis of the machining center throughout the entire machining process;

[0058] Step 4: Connect the flexible pipelines of the hydraulic workstation built into the machining center to the oil inlet and return port of the micro CNC hydraulic drive double-ended milling cutter holder;

[0059] Step 5: Start the hydraulic workstation. The output pressure of the hydraulic workstation is 1.7MPa. Use a digital laser tachometer to test the actual speed of the tool. The test result is 1312 r / min. Adjust the output pressure of the hydraulic workstation to 1.5MPa. The test result of the tool speed is 1208 r / min, which is close to the process setting value of 1200±50 r / min. Record the output pressure value of 1.5MPa of the hydraulic workstation.

[0060] Step 6: Adjust the machining center spindle to a suitable position, and mark it as the coordinate origin of the M12×1 threaded hole on the workpiece. Figure 2 As shown in the workpiece clamping diagram, taking into account the center distance of machining the end face of the #4 sealing thread (M12×1), the bottom hole bar, and the thread milling cutter, adjust the position of the CNC rotary table relative to the machining center spindle to (34.5, 0, 23~24) for clamping the micro CNC hydraulically driven double-head milling cutter. Record the result, program the code, and start the hydraulic workstation and machining center to process the workpiece.

[0061] Step 7: Following the program, use a bar end mill to machine the end face and bottom hole of the #4 sealing thread (M12×1). After this machining step is completed, return the spindle to the starting coordinate value and rotate the spindle 180° (to align the micro CNC-assisted double-ended end mill holder with the Y-axis of the machining center). Restart the machining center and use the thread end mill to complete the machining of M12×1 according to the predetermined program.

[0062] Step 8: Inspect all machining dimensions of the workpiece; and inspect the M12×1 internal thread with a custom thread plug gauge to complete all machining steps and inspection items for this part.

[0063] The parts machined using this micro CNC hydraulically driven double-ended milling cutter with tool holder were inspected on a Zeiss coordinate measuring machine. All machined dimensions met the dimensional accuracy requirements of the drawings, and the dimensional consistency after machining was good. The M12×1 internal thread was also inspected using a thread plug gauge from the Chengliang brand. The go gauge passed through the M12×1 internal thread smoothly, and the no-go gauge engaged with the M12×1 internal thread by one pitch, which met the requirements of the drawings and relevant standards.

[0064] Many embodiments and applications beyond the examples provided will be apparent to those skilled in the art upon reading the foregoing description. Therefore, the scope of this teaching should not be determined by reference to the foregoing description, but rather by reference to the foregoing claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the applicant has not considered that subject matter as part of the disclosed utility model subject matter.

[0065] The above content provides a further detailed description of this utility model. It should not be considered that the specific embodiments of this utility model are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of this utility model, and all such deductions or substitutions should be considered to fall within the scope of protection of this utility model as defined by the submitted claims.

Claims

1. A miniature CNC hydraulically driven double-ended end mill holder, characterized in that, It includes a double-headed knife handle (1), one end of which is fixedly connected to an end cap (2), and a drive mechanism is provided inside the double-headed knife handle (1); The drive mechanism includes a drive impeller (3), and a bearing (4) is provided inside the double-headed tool holder (1). The drive impeller (3) and the bearing (4) are installed inside the double-headed tool holder (1) by interference fit of a bar end mill (7) and a thread end mill (8). A hydraulic oil inlet (9) and a hydraulic oil outlet (10) are provided on the outer wall of the double-headed tool holder (1).

2. The micro CNC hydraulically driven double-ended milling cutter holder according to claim 1, characterized in that, The bearing (4) is a self-sealing bearing.

3. The micro CNC hydraulically driven double-ended milling cutter holder according to claim 1, characterized in that, The double-headed tool holder (1), end cap (2) and drive impeller (3) are all made of 40Cr steel and have undergone quenching and tempering treatment, with a hardness of HRC32-36.

4. A micro CNC hydraulically driven double-ended milling cutter holder according to claim 1, characterized in that, The hydraulic oil inlet (9) and hydraulic oil outlet (10) are respectively connected to the hydraulic workstation via flexible pipelines.

5. A micro CNC hydraulically driven double-ended milling cutter holder according to claim 1, characterized in that, The outer wall of the double-headed tool holder (1) is also provided with an O-ring (5).

6. A micro CNC hydraulically driven double-ended milling cutter holder according to claim 5, characterized in that, The O-ring (5) is made of nitrile rubber.

7. A micro CNC hydraulically driven double-ended milling cutter holder according to claim 1, characterized in that, The double-headed handle (1) and the end cap (2) are connected by screws (6), and the inner surface of the end cap (2) is provided with a mounting groove that matches the drive impeller (3).

8. A micro CNC hydraulically driven double-ended milling cutter holder according to claim 7, characterized in that, The screws (6) are made of alloy steel, and there are four screws (6).

9. A micro CNC hydraulically driven double-ended milling cutter holder according to claim 7, characterized in that, Both the bar end mill (7) and the thread end mill (8) are made of high-speed tool steel.

10. A micro CNC hydraulically driven double-ended milling cutter holder according to claim 1, characterized in that, The number of drive impellers (3) is two, which are respectively installed at both ends of the double-headed tool holder (1).

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