Three-face fishtail type milling cutter

Abstract

The utility model relates to the technical field of milling cutters, in particular to a three-face fishtail type milling cutter. Comprising a tool bit, a tool bar and a positioning structure, the cutter head is fixedly arranged at one end of the cutter bar; a cavity for accommodating the positioning structure is formed in the cutter bar; the positioning structure is arranged in the cavity; the positioning structure comprises a reset spring and a positioning rod; the positioning rod is connected with the reset spring; the positioning rod is connected with the cutter bar in a swinging mode so as to protrude out of the cutter bar or be folded into the cutter bar. In the prior art, when a worker assembles a fishtail milling cutter, the depth of the milling cutter inserted into a spring chuck can only be judged through visual inspection or hand feeling. After the operation is completed, a corresponding measuring tool is needed for calibration. The operation process is relatively complicated, and a certain error exists due to manual measurement. Compared with the prior art, the inserting state of the positioning rod can be visually observed through the swinging state of the positioning rod in the actual operation process, so that whether the operation reaches the standard or not is judged, and the operation precision is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of milling cutter technology, and in particular to a three-sided fishtail milling cutter. Background Technology

[0002] The fishtail end mill is a specialized milling cutter with a forked, fishtail-shaped cutting edge. Its key features include a sharp cutting edge and smooth chip removal, making it suitable for grooving, contouring, and slot milling, especially excelling in machining soft materials such as wood and plastics. Its unique design reduces cutting resistance, prevents material tearing, and ensures a smooth groove surface. The cutter body is typically made of high-speed steel or cemented carbide. This tool is widely used in mold making, furniture manufacturing, and other fields, balancing efficiency and precision.

[0003] In actual assembly, the milling cutter needs to be paired with a corresponding assembly structure to be assembled with the milling machine. The assembly structure specifically includes: a clamping nut, a spring collet, and a tool holder. The tool holder is used to connect to the milling machine. The clamping nut is screwed onto the tool holder. The spring collet is placed in the cavity between the clamping nut and the tool holder, and it deforms as the clamping nut is gradually tightened. The specific operation is as follows: Engage the spring collet with the clamping nut, then insert the milling cutter into the spring collet through the through hole on the clamping nut. At this point, the three components are secured to the tool holder. Tighten the clamping nut, causing the spring collet to deform and clamp the milling cutter.

[0004] Due to the unique structure of fish-tail end mills, the insertion length into the collet is fixed, influenced by the end mill's own length, diameter, and material. This is crucial to ensure sufficient rigidity of the exposed portion of the fish-tail end mill during machining. However, in practice, operators must rely on touch and visual inspection to determine the insertion length. After insertion, the exposed length must be measured using appropriate measuring tools; if it falls short, manual adjustment is necessary. Therefore, the process is relatively cumbersome, and manual operation introduces inherent errors. Utility Model Content

[0005] To address the technical problems of existing technologies, this utility model provides a three-sided fishtail end mill.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0007] A three-sided fishtail end mill includes: a cutter head, a cutter shank, and a positioning structure; the cutter head is fixedly disposed at one end of the cutter shank; a cavity for accommodating the positioning structure is opened inside the cutter shank; the positioning structure is disposed inside the cavity; the positioning structure includes a return spring and a positioning rod; the positioning rod is connected to the return spring; the positioning rod is oscillatingly connected to the cutter shank, so as to protrude out of the cutter shank or retract into the cutter shank.

[0008] Furthermore, the positioning structure includes a reset plate; the reset plate is disposed within the cavity of the tool holder; the reset plate is capable of sliding in the vertical direction; the reset plate is connected to a reset spring. One end of the positioning rod is oscillatingly connected to the reset plate; when the reset plate slides in the vertical direction, it can cause the positioning rod to protrude out of the tool holder or retract into the tool holder.

[0009] Furthermore, the positioning structure includes a limiting rod; the limiting rod is fixedly installed in the cavity of the tool bar; the limiting rod is arranged in a vertical direction; and the reset plate is slidably sleeved on the limiting rod.

[0010] Furthermore, a transmission protrusion is provided at one end of the positioning rod; the transmission protrusion is fixedly connected to the positioning rod; a receiving groove is provided on the reset plate; the positioning rod is embedded in the receiving groove; a transmission groove is provided on the inner wall of the receiving groove; the transmission groove extends from one end of the receiving groove to the other end; the transmission protrusion extends into the transmission groove.

[0011] Furthermore, a through groove is provided on the tool holder; the through groove passes through the tool holder; the through groove corresponds to the positioning rod; the positioning rod extends into the cavity through the through groove; a swinging protrusion is fixedly provided on the positioning rod; the swinging protrusion is rotatably embedded in the inner wall of the through groove.

[0012] Furthermore, the positioning rod is also provided with a conical protrusion and a positioning spring; the conical protrusion is slidably set at one end of the positioning rod; the positioning spring is embedded in the positioning rod; one end of the positioning spring is connected to the conical protrusion, and the other end is connected to the positioning rod.

[0013] Furthermore, there are four positioning rods; the positioning rods are arranged along the circumference of the tool bar. Attached Figure Description

[0014] Figure 1 Overall structure diagram.

[0015] Figure 2 : Overall structural diagram of the positioning structure.

[0016] Figure 3 Reset board structure diagram.

[0017] Figure 4 : Positioning rod structure diagram.

[0018] Figure 5 : Exploded view of a portion of the positioning rod.

[0019] In the diagram: 1. Cutter head; 2. Cutter bar; 21. Through groove; 3. Positioning structure; 31. Return spring; 32. Positioning rod; 33. Return plate; 34. Limiting rod; 321. Transmission protrusion; 331. Receiving groove; 3311. Transmission groove; 322. Swinging protrusion; 323. Conical protrusion; 324. Positioning spring. Detailed Implementation

[0020] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0021] A three-sided fishtail end mill includes: a cutter head 1, a cutter shank 2, and a positioning structure 3. The cutter head 1 is fixedly mounted at one end of the cutter shank 2. A cavity is formed inside the cutter shank 2 to accommodate the positioning structure 3.

[0022] The positioning structure 3 is disposed within the cavity. The positioning structure 3 includes a return spring 31, positioning rods 32, a return plate 33, and limiting rods 34. There are four positioning rods 32. The positioning rods 32 are arranged circumferentially along the tool holder 2. The limiting rods 34 are fixedly disposed within the cavity of the tool holder 2. The return plate 33 is disposed within the cavity of the tool holder 2. The limiting rods 34 are arranged vertically. The return plate 33 is slidably sleeved on the limiting rods 34. Thus, the return plate 33 can slide vertically. Simultaneously, the return plate 33 is connected to the return spring 31. One end of the positioning rod 32 is provided with a transmission protrusion 321. The transmission protrusion 321 is fixedly connected to the positioning rod 32. The return plate 33 has a receiving groove 331. The positioning rod 32 is embedded in the receiving groove 331. The inner wall of the receiving groove 331 has a transmission groove 3311. The transmission groove 3311 extends from one end of the receiving groove 331 to the other end. The transmission protrusion 321 extends into the transmission groove 3311. Thus, one end of the positioning rod 32 can be oscillatingly connected to the reset plate 33. On the other hand, a through groove 21 is provided on the tool bar 2. The through groove 21 penetrates the tool bar 2. The through groove 21 corresponds to the positioning rod 32. The positioning rod 32 extends into the cavity through the through groove 21. A swinging protrusion 322 is fixedly provided on the positioning rod 32. The swinging protrusion 322 is rotatably embedded in the inner wall of the through groove 21. Thus, the positioning rod 32 can be oscillatingly connected to the tool bar 2. Furthermore, the positioning rod 32 is also provided with a conical protrusion 323 and a positioning spring 324. The conical protrusion 323 is slidably provided at one end of the positioning rod 32. The positioning spring 324 is embedded in the positioning rod 32. One end of the positioning spring 324 is connected to the conical protrusion 323, and the other end is connected to the positioning rod 32.

[0023] In its default state, the positioning rod 32 is in an outward-opening position as shown in the attached figure. When a milling cutter needs to be assembled, the cutter shank 2 is aligned with the spring collet, and the cutter shank 2 is pushed so that it extends into the spring collet. During the pushing of the cutter shank 2, the spring collet contacts the outer wall of the cutter shank 2. At the same time, the spring collet abuts against the positioning rod 32. As the cutter shank 2 gradually extends into the spring collet, the spring collet will cause the positioning rod 32 to swing relative to the cutter shank 2 about the swinging protrusion 322, thereby causing the positioning rod 32 to gradually retract into the cutter shank 2. During the swinging process of the positioning rod 32, the movement path of the end of the positioning rod 32 with the transmission protrusion 321 is an arc about the swinging protrusion 322. Therefore, the movement path of the transmission protrusion 321 can be decomposed into two different directions of movement: horizontal movement and vertical movement. Thus, during the swinging process of the positioning rod 32, the transmission protrusion 321 will slide horizontally within the transmission groove 3311. Meanwhile, because the transmission protrusion 321 has a motion component in the vertical direction, the positioning rod 32 will push the reset plate 33 to slide in the vertical direction during the swinging process. As a result, the reset plate 33 will pull the reset spring 31 to accumulate elastic force.

[0024] As the tool holder 2 is gradually inserted into the spring collet, the positioning rod 32 will gradually retract into the tool holder 2. Finally, the conical protrusion 323 at the other end of the positioning rod 32 will abut against the outer wall of the tool holder 2. At this time, the outer wall of the tool holder 2 will press against the conical protrusion 323, and with the continued movement of the tool holder 2, the conical protrusion 323 will retract into the positioning rod 32, compressing the positioning spring 324, causing the positioning spring 324 to continue its elastic force. Finally, when the tool holder 2 is inserted to the specified depth, the conical protrusion 323 will move with the swinging motion of the positioning rod 32 into the groove located on the inner wall of the through groove 21. At this time, the accumulated elastic force of the positioning spring 324 is released, thereby pushing the conical protrusion 323 to suddenly extend. As a result, the conical protrusion 323 will emit a distinct "click" sound. Simultaneously, the operator's feel will change significantly. Based on this, the operator can determine that the insertion depth of the tool holder 2 has reached the specified depth.

[0025] In summary, this invention allows operators to clearly determine whether the insertion depth of the tool holder 2 has reached the specified depth. Furthermore, after the operation is completed, there is no need for secondary measurement using measuring tools. Therefore, it greatly simplifies the operation for operators and effectively improves operational accuracy.

[0026] When the milling cutter needs to be removed, hold the cutter and pull the cutter shank 2 out of the collet. As the positioning rod 32 gradually loses the restraint of the collet, the stored force of the return spring 31 is released. Consequently, under the force of the return spring 31, the return plate 33 will slide in the opposite direction. During this sliding process, the return plate 33 will pull the positioning rod 32 to swing in the opposite direction, causing the conical protrusion 323 to retract back into the positioning rod 32, thus causing the positioning rod 32 to swing in the opposite direction. Finally, when the cutter shank 2 is completely pulled out of the collet, the positioning rod 32 will protrude out of the cutter shank 2 again. At this point, the default state is restored.

[0027] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A three-sided fishtail end mill, characterized in that: include: Cutter head, cutter shank, positioning structure; The cutting head is fixedly mounted at one end of the cutting rod; The tool holder has a cavity for accommodating the positioning structure. The positioning structure is disposed within the cavity; The positioning structure includes a return spring and a positioning rod; The positioning rod is connected to the return spring; The positioning rod is oscillatingly connected to the tool bar, protruding out of the tool bar or retracting into the tool bar.

2. A three-sided fishtail end mill according to claim 1, characterized in that: The positioning structure includes a reset plate; The reset plate is disposed inside the cavity of the tool holder; The reset plate is capable of sliding in the vertical direction; The reset plate is connected to the reset spring; One end of the positioning rod can be oscillatingly connected to the reset plate; When the reset plate slides vertically, it can cause the positioning rod to protrude out of the tool bar or retract into the tool bar.

3. A three-sided fishtail end mill according to claim 2, characterized in that: The positioning structure includes a limiting rod; The limiting rod is fixedly installed inside the cavity of the tool bar; The limiting rod is set in the vertical direction; The reset plate is slidably sleeved on the limiting rod.

4. A three-sided fishtail end mill according to claim 2, characterized in that: One end of the positioning rod is provided with a transmission protrusion; The transmission protrusion is fixedly connected to the positioning rod; The reset plate is provided with a receiving groove; The positioning rod is embedded in the receiving groove; The inner wall of the receiving groove is provided with a transmission groove; The transmission groove extends from one end of the receiving groove to the other end; The transmission protrusion extends into the transmission groove.

5. A three-sided fishtail end mill according to claim 1, characterized in that: The tool holder is provided with a through groove; The through groove extends through the tool holder; The through groove corresponds to the positioning rod; The positioning rod extends into the cavity through the through groove; A swing protrusion is fixedly provided on the positioning rod; The swing protrusion is rotatably embedded in the inner wall of the through groove.

6. A three-sided fishtail end mill according to claim 5, characterized in that: The positioning rod is also provided with a conical protrusion and a positioning spring; The conical protrusion is slidably disposed at one end of the positioning rod; The positioning spring is embedded in the positioning rod; One end of the positioning spring is connected to the conical protrusion, and the other end is connected to the positioning rod.

7. A three-sided fishtail end mill according to any one of claims 1 to 6, characterized in that: The number of positioning rods is four; The positioning rod is arranged circumferentially along the tool bar.

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