Anti-interference milling cutter structure

Abstract

The utility model discloses an anti-interference milling cutter structure which comprises a cone chuck and a jacket used for installing a short cutter handle on a working machine table, the cone chuck is in threaded connection with the jacket, one end of the cone chuck is provided with a ball-end cutter, the ball-end cutter comprises a cutter shaft, an anti-collision transition table and a hemispherical cutting part, the hemispherical cutting part is provided with a plurality of curved-surface cutting edges, and the curved-surface cutting edges are arranged on the cutter shaft. The anti-collision transition table is formed by integrally forming the top of the hemispherical cutting part and upwards extends, the section radius of the anti-collision transition table is smaller than that of the top of the hemispherical cutting part, and the cutter shaft is fixedly connected with the top of the anti-collision transition table; the deep hole machining device can machine a deep hole, and can effectively avoid collision, collision with the surface of a workpiece to be machined and damage to the shape in the hole in the face of vibration during machining.

Description

Technical Field

[0001] This utility model relates to the technical field of thermal expansion tool holders, and in particular to an anti-interference milling cutter structure. Background Technology

[0002] Lathe cutting tools require short tool holders for securing during operation. However, current short tool holders are inconvenient to use. They not only fail to secure the tool effectively, leading to decreased stability after prolonged use, but also, since the tool is usually welded directly to the workpiece, disassembly is difficult, causing numerous production inconveniences. When machining deep holes, using conventional thermal expansion tool holders to clamp the tool is prone to collisions and interference with the workpiece edge or the hole itself. Therefore, a structure is needed that can avoid interference and collisions when machining deep holes and experiencing small amplitude vibrations. Utility Model Content

[0003] The purpose of this invention is to provide an anti-interference milling cutter structure to overcome the shortcomings of the existing technology.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] An anti-interference milling cutter structure includes a tapered chuck and a collet for mounting a short tool holder to a machine tool. The tapered chuck is threadedly connected to the collet. One end of the tapered chuck is fitted with a ball end mill, which includes a cutter shaft, a shock-absorbing transition platform, and a hemispherical cutting section. The hemispherical cutting section has multiple curved cutting edges. The shock-absorbing transition platform is integrally formed from the top of the hemispherical cutting section and extends upwards. The cross-sectional radius of the shock-absorbing transition platform is smaller than the cross-sectional radius of the top of the hemispherical cutting section. The cutter shaft is fixedly connected to the top of the shock-absorbing transition platform. The left end face of the tapered chuck has a threaded countersunk hole for mounting the tool. The middle of the right end face of the tapered chuck has a bolt for connecting to the collet. It also includes a hollow inverted tapered positioning block sleeved outside the bolt. The left end of the collet has an inverted tapered groove for receiving the inverted tapered positioning block and a threaded hole for mating with the bolt.

[0006] To elaborate further, the inverted cone positioning block includes a block body, a circular through hole, and a washer groove opened at the left end of the block body.

[0007] To further elaborate, a first washer is clamped between the right end face of the conical chuck and the washer groove, and a second washer is clamped between the bottom surface of the inverted conical groove and the right end face of the inverted conical positioning block.

[0008] To elaborate further, the right end face of the jacket is provided with a connecting groove for connecting with the machine tool.

[0009] To elaborate further, the right end face of the jacket has two symmetrically arranged first positioning grooves.

[0010] To elaborate further, two symmetrically arranged positioning holes are provided on the side wall of the jacket.

[0011] To elaborate further, a clamping groove is provided in the middle of the sleeve.

[0012] To elaborate further, the middle part of the jacket has two opposing second positioning grooves, one of which has a circular groove.

[0013] To elaborate further, a third positioning groove is provided in the middle of the jacket.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention enables deep hole machining while effectively preventing collisions with the workpiece surface and damage to the hole's shape due to vibrations during machining. The tool is fixed in place via a countersunk thread, ensuring good stability and easy disassembly. The tapered chuck and collet are threadedly connected, facilitating the replacement of tapered chucks of different lengths and adjusting the overall length and height of the short tool holder. A tapered positioning block at the threaded connection between the tapered chuck and collet provides excellent positioning stability, superior shock resistance, and prevents loosening. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a schematic diagram of the ball end mill.

[0018] Attached image annotations:

[0019] 1. Conical chuck; 2. Collet; 3. Ball end mill; 4. Cutter shaft; 5. Anti-collision transition platform; 6. Hemispherical cutting part; 7. Connecting groove; 8. First positioning groove; 9. Positioning hole; 10. Second positioning groove. Detailed Implementation

[0020] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. When the number of elements is referred to as "multiple," it can be any number of two or more. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings:

[0024] like Figure 1-2 As shown, an anti-interference milling cutter structure includes a conical chuck 1 and a collet 2 for mounting a short tool holder to a worktable. The conical chuck 1 and the collet 2 are threaded together. A ball end mill 3 is mounted on one end of the conical chuck 1. The ball end mill 3 includes a cutter shaft 4, a collision avoidance transition platform 5, and a hemispherical cutting part 6. The hemispherical cutting part 6 has multiple curved cutting edges. The collision avoidance transition platform 5 is integrally formed from the top of the hemispherical cutting part 6 and extends upward. The cross-sectional radius of the collision avoidance transition platform 5 is smaller than the cross-sectional radius of the top of the hemispherical cutting part 6. The cutter shaft 4 is fixedly connected to the top of the collision avoidance transition platform 5. It is worth mentioning that in this embodiment, the cutter shaft 4 and the conical chuck 1 are interference-fitted using the principle of thermal expansion and contraction.

[0025] Specifically, the left end face of the conical chuck 1 has a threaded countersunk hole for mounting the cutting tool, and the middle of the right end face of the conical chuck 1 has a bolt for connecting with the collet 2. It also includes a hollow inverted conical positioning block sleeved outside the bolt. The left end of the collet 2 has an inverted conical groove for receiving the inverted conical positioning block and a threaded hole for cooperating with the bolt. This invention uses a threaded countersunk hole to fix and mount the cutting tool, providing good stability and easy disassembly. The threaded connection between the conical chuck 1 and the collet 2 facilitates the disassembly and replacement of conical chuck 1 of different lengths, adjusting the total length of the short tool holder, and thus adjusting the height of the short tool holder. The inverted conical positioning block at the threaded connection between the conical chuck 1 and the collet 2 provides good positioning stability, excellent shock resistance, and prevents loosening.

[0026] In this embodiment, the inverted cone positioning block includes a block body, a circular through hole, and a washer groove at the left end of the block body. The outer diameter of the left end face of the block body is 16.5 mm, the outer diameter of the right end face of the block body is 14.5 mm, the diameter of the circular through hole is 10.5 mm, the diameter of the washer groove is 14.5 mm, and the height of the washer groove is 1.5 mm. The inverted cone positioning block is installed at the threaded connection between the cone chuck 1 and the sleeve 2. The slope of the outer wall of the inverted cone positioning block is reasonably designed, resulting in good positioning stability and preventing loosening.

[0027] In this embodiment, a first washer is clamped between the right end face of the conical chuck 1 and the washer groove, and a second washer is clamped between the bottom surface of the inverted conical groove and the right end face of the inverted conical positioning block. The use of the first and second washers provides good shock resistance and excellent cushioning, effectively preventing damage to the connecting components from collisions and extending their service life.

[0028] In this embodiment, the right end face of the sleeve 2 is provided with a connecting groove 7 for connecting to the machine tool. The connection groove 7 facilitates installation.

[0029] In this embodiment, the right end face of the sleeve 2 has two symmetrically arranged first positioning grooves 8. The short tool holder is positioned and installed through the first positioning grooves 8, which is convenient and has high stability.

[0030] In this embodiment, two symmetrically arranged positioning holes 9 are provided on the side wall of the sleeve 2. In actual use, the short tool holder is further positioned and installed by installing positioning bolts at the positioning holes 9, ensuring stable positioning and good safety.

[0031] In this embodiment, a clamping groove is provided in the middle of the sleeve 2.

[0032] In this embodiment, the middle of the sleeve 2 has two opposing second positioning grooves 10, one of which has a circular groove. The use of two second positioning grooves 10 with different shapes effectively prevents the short tool holder from misaligning 180° when it is positioned and installed on the machine tool.

[0033] In this embodiment, a third positioning groove is provided in the middle of the sleeve 2. The third positioning groove facilitates installation.

[0034] I. Overall structural assembly

[0035] Connection between cone chuck 1 and sleeve 2

[0036] Select the appropriate specifications for the tapered chuck 1 and the sleeve 2. The external thread of the tapered chuck 1 should be compatible with the internal thread of the sleeve 2. During installation, screw the tapered chuck 1 into the sleeve 2 and gradually tighten it by rotating the threads to ensure a secure connection and good concentricity. A torque wrench can be used to tighten to the specified torque value to prevent loosening during subsequent machining.

[0037] Installation of ball end mill 3

[0038] Install the ball end mill 3 onto one end of the tapered chuck 1. First, align the cutter shaft 4 of the ball end mill 3 with the mounting hole at the end of the tapered chuck 1, and then gently insert the cutter shaft 4 into the mounting hole. The cutter shaft 4 can be pressed into the mounting hole using a cold pressing method. During the pressing process, ensure that the cutter shaft 4 is perpendicular to the axial direction of the tapered chuck 1 to ensure the stability of the ball end mill 3 after installation.

[0039] II. Structural Details of the Ball End Cutter

[0040] Ball end mill 3-part manufacturing

[0041] The cutter shaft 4 of the ball end mill 3 is made of high-strength alloy steel through precision forging and subsequent turning. The forging process ensures that the cutter shaft 4 has good mechanical properties, while the turning process can precisely control the dimensional accuracy of the cutter shaft 4, such as parameters like diameter and length.

[0042] The hemispherical cutting part 6 is made of cemented carbide. Cemented carbide has high hardness and high wear resistance, making it suitable for machining. In manufacturing the hemispherical cutting part 6, it is first formed using powder metallurgy, and then ground. During the grinding process, a precise CNC grinding machine is used to machine the hemispherical cutting part 6 according to a predetermined cutting edge shape and curved surface profile, thereby forming multiple curved cutting edges.

[0043] The anti-collision transition platform 5 is manufactured and integrated with the hemispherical cutting part 6. Since the anti-collision transition platform 5 is an integrally formed upward extension of the top of the hemispherical cutting part 6, its manufacturing can be completed simultaneously with the forming process of the hemispherical cutting part 6. For example, in powder metallurgy mold design, considering the structure of the anti-collision transition platform 5, it is naturally connected to the hemispherical cutting part 6 during the forming process. Afterwards, overall finishing is performed to ensure that the cross-sectional radius of the anti-collision transition platform 5 is smaller than the cross-sectional radius of the top of the hemispherical cutting part 6, meeting the dimensional requirement.

[0044] Anti-interference operation during processing

[0045] When machining deep holes, reasonable cutting parameters are set through the machine tool's control system. Based on factors such as the hardness of the material to be machined, the diameter and depth of the deep hole, appropriate cutting speed, feed rate, and depth of cut are determined.

[0046] When the end mill is cutting in a deep hole, the ball end mill 3's hemispherical cutting section 6 has multiple curved cutting edges, which can adapt to different cutting surfaces within the hole. If vibration occurs during machining, the anti-collision transition platform 5, whose cross-sectional radius is smaller than that of the top of the hemispherical cutting section 6, can first contact the surface of the workpiece or other structures within the hole, effectively preventing direct collision between the hemispherical cutting section 6 and the workpiece and preventing damage to the shape of the hole. Simultaneously, when machining deep hole walls at different angles, the rotation angle of the end mill can be adjusted as needed, and the curved cutting edges of the ball end mill 3's hemispherical cutting section 6 can flexibly adapt to these changes, reducing the possibility of interference.

[0047] III. Maintenance and Replacement

[0048] Regular inspection

[0049] During the use of milling cutters, they should be inspected regularly. Use tools such as an optical microscope to observe the wear of the cutting edges and check the anti-collision transition plate 5 for any collision marks or damage. For the wear of the cutting edges, the amount of wear can be measured to determine whether the milling cutter needs to be replaced.

[0050] Change operation

[0051] If the ball end mill 3 is severely worn or damaged, loosen the connection between the tapered chuck 1 and the collet 2 (rotate the tapered chuck 1 in the opposite direction to the installation direction), and then remove the ball end mill 3. Reinstall the new ball end mill 3 onto the tapered chuck 1 using the installation method described above, and then tighten the tapered chuck 1 into the collet 2. Deep hole machining operations can then continue.

[0052] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. For those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An anti-interference milling cutter structure, characterized in that: It includes a tapered chuck and a collet for mounting a short tool holder to a workbench. The tapered chuck is threaded to the collet. One end of the tapered chuck is equipped with a ball end mill. The ball end mill includes a tool shaft, a shock-absorbing transition platform, and a hemispherical cutting part. The hemispherical cutting part is provided with multiple curved cutting edges. The shock-absorbing transition platform is integrally formed from the top of the hemispherical cutting part and extends upward. The cross-sectional radius of the shock-absorbing transition platform is smaller than the cross-sectional radius of the top of the hemispherical cutting part. The tool shaft is fixedly connected to the top of the shock-absorbing transition platform.

2. The anti-interference milling cutter structure as described in claim 1, characterized in that: The left end face of the tapered chuck has a threaded countersunk hole for mounting the tool. The middle part of the right end face of the tapered chuck has a bolt for connecting with the sleeve. It also includes a hollow inverted tapered positioning block sleeved outside the bolt. The left end of the sleeve has an inverted tapered groove for receiving the inverted tapered positioning block and a threaded hole for cooperating with the bolt.

3. The anti-interference milling cutter structure as described in claim 2, characterized in that: The inverted cone positioning block includes a block body, a circular through hole, and a washer groove opened at the left end of the block body.

4. The anti-interference milling cutter structure as described in claim 3, characterized in that: A first washer is clamped between the right end face of the conical chuck and the washer groove, and a second washer is clamped between the bottom surface of the inverted conical groove and the right end face of the inverted conical positioning block.

5. The anti-interference milling cutter structure as described in claim 1, characterized in that: The right end face of the jacket is provided with a connecting groove for connecting to the machine tool.

6. The anti-interference milling cutter structure as described in claim 1, characterized in that: The right end face of the jacket has two symmetrically arranged first positioning grooves.

7. The anti-interference milling cutter structure as described in claim 1, characterized in that: Two symmetrically arranged positioning holes are provided on the side wall of the jacket.

8. The anti-interference milling cutter structure as described in claim 1, characterized in that: The sleeve has a clamping groove in the middle.

9. The anti-interference milling cutter structure as described in claim 1, characterized in that: The sleeve has two opposing second positioning grooves in the middle, one of which has a circular groove.

10. The anti-interference milling cutter structure as described in claim 1, characterized in that: A third positioning groove is provided in the middle of the jacket.

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