Three-edge spiral chamfering tool

Abstract

This utility model belongs to the field of cutting tool technology, specifically relating to a three-flute helical chamfering cutter, including a shank, the upper end of which is fixedly connected to the bottom end of the cutter head. This utility model creates three helical cutting edges by opening three helical grooves in the cutter head, resulting in a symmetrical three-flute design that greatly improves the rigidity of the tool, making the cutting process smoother and effectively suppressing vibration. This leads to higher surface finish and dimensional accuracy. Furthermore, both the shank and the cutter head have interconnected guide holes, and a coolant outlet connects one of the helical grooves to the guide holes. During cutting, high-pressure coolant is injected into the guide holes via an injection pipe, guide plate, and connecting pipe, allowing the high-pressure coolant to spray out through the outlet, directly acting on the root region of the chip formation. This effectively reduces the cutting temperature and uses fluid kinetic energy to directly "blow" the chips away from the cutting edge and into the helical grooves, assisting in the high-speed discharge of chips along the helical grooves.

Description

Technical Field

[0001] This utility model belongs to the field of cutting tool technology, specifically relating to a three-bladed spiral chamfering knife. Background Technology

[0002] Chamfering is a crucial machining process, its purpose being to remove burrs from workpiece openings or edges, creating a guide bevel for easier assembly and improved workpiece safety and aesthetics. The chamfering cutter is the key tool for this process. Most chamfering cutters on the market are made of solid carbide and primarily feature a two-flute straight flute or two-flute helical flute design. While two-flute chamfering cutters are simple to manufacture, they have the following inherent drawbacks during machining:

[0003] 1. Rigidity imbalance: The two-edge design leads to an inherent imbalance in the tool during rotation, which easily generates vibration during high-speed cutting, affecting the surface finish of the machined surface and producing chatter marks.

[0004] 2. Poor chip removal: The chip removal capacity of straight flutes or shallow spiral flutes is limited. Especially when machining sticky materials (such as stainless steel and aluminum alloys), chips are prone to sticking and clogging, scratching the machined surface, and even causing the tool to break.

[0005] 3. Poor cooling effect: Most existing cutting tools use external spraying for cooling. When machining narrow parts such as deep holes and blind holes, the sprayed coolant has difficulty contacting the cutting tool, thus affecting the cooling effect. Utility Model Content

[0006] The purpose of this invention is to provide a three-flute helical chamfering tool, which can greatly improve the rigidity of the tool, make the cutting process more stable, effectively suppress vibration, and thus obtain higher surface quality and dimensional accuracy.

[0007] The specific technical solution adopted by this utility model is as follows:

[0008] The three-blade helical chamfering cutter includes a handle, the upper end of which is fixedly connected to the bottom end of the cutter head. The cutter head has three helical grooves that form three helical cutting edges. Both the cutter head and the handle have interconnected guide holes.

[0009] The cutter head also has a liquid outlet hole, which connects the guide hole and one of the spiral grooves.

[0010] Furthermore, the bottom end of the guide hole is fixedly connected to the left end of the connecting pipe.

[0011] Furthermore, the right end of the connecting pipe is fixedly connected to the rotating ring.

[0012] Furthermore, the rotating ring is rotatably connected to the inner side of the guide plate via a sealed bearing.

[0013] Furthermore, the outer surface of the guide plate is fixedly connected to one end of the injection tube.

[0014] Furthermore, the upper end of the guide plate is fixedly connected to the bottom surface of the fixing ring, and the inner side of the fixing ring is rotatably connected to the outer surface of the tool holder through a sealed bearing.

[0015] The technical effects achieved by this utility model are as follows:

[0016] This invention features three spiral grooves on the cutting head, creating three spiral cutting edges. This symmetrical three-edge design significantly improves tool rigidity, resulting in a smoother cutting process and effectively suppressing vibration. This leads to higher surface finish and dimensional accuracy. Furthermore, interconnected guide holes are provided in both the tool holder and the cutting head, along with a coolant outlet connecting one of the spiral grooves to the guide holes. During cutting, high-pressure coolant is injected into the guide holes via an injection pipe, guide plate, and connecting pipe. The high-pressure coolant is then sprayed out through the outlet, directly acting on the root region of the chips. This effectively reduces cutting temperature and uses fluid kinetic energy to "blow" the chips away from the cutting edge and into the spiral grooves, assisting in high-speed chip removal along the grooves. This "directional internal cooling" design, working in conjunction with the spacious spiral grooves, constitutes an active chip removal system. This effectively solves the chip removal and heat dissipation problems in deep hole and blind hole chamfering, further improving machining efficiency and tool life. Attached Figure Description

[0017] Figure 1 This is a front view structural diagram of the present invention;

[0018] Figure 2 This is a top view of the structure of this utility model;

[0019] Figure 3 This is a front view cross-sectional structural diagram of the present invention;

[0020] Figure 4 This is a front view structural diagram of the fixing ring in this utility model;

[0021] Figure 5 This is a front view cross-sectional structural diagram of the fixing ring in this utility model.

[0022] The attached diagram lists the components represented by each number as follows:

[0023] 1. Tool holder; 2. Guide plate; 3. Injection tube; 4. Fixing ring; 5. Tool head; 6. Inlet hole; 7. Spiral cutting edge; 8. Spiral groove; 9. Guide hole; 10. Rotating ring; 11. Connecting tube. Detailed Implementation

[0024] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0025] like Figure 1-5 As shown, a three-flute helical chamfering cutter includes a shank 1, the upper end of which is fixedly connected to the bottom end of the cutter head 5. The cutter head 5 has three helical grooves 8, which form three helical cutting edges 7. Both the cutter head 5 and the shank 1 have interconnected guide holes 9. By forming three helical cutting edges 7 in the cutter head 5 with three helical grooves 8, the three-flute symmetrical design greatly improves the rigidity of the tool, makes the cutting process more stable, effectively suppresses vibration, and thus achieves higher surface quality and dimensional accuracy. The chips formed during the cutting process are discharged through the helical grooves 8.

[0026] The cutter head 5 also has a liquid outlet hole 6, which connects the guide hole 9 and one of the spiral grooves 8.

[0027] The bottom end of the guide hole 9 is fixedly connected to the left end of the connecting pipe 11. By opening the guide holes 9 in both the tool holder 1 and the tool head 5, and opening the liquid outlet hole 6 to connect one of the spiral grooves 8 with the guide hole 9, high-pressure coolant is injected into the guide hole 9 through the injection pipe 3, the guide plate 2, and the connecting pipe 11 during cutting. The high-pressure coolant is then sprayed out through the liquid outlet hole 6 and acts directly on the root area where the chips are formed. This effectively reduces the cutting temperature and uses fluid kinetic energy to directly "blow" the chips away from the cutting edge and into the spiral groove 8, assisting the chips to be discharged at high speed along the spiral groove 8. This "directional internal cooling" design, working in conjunction with the spacious spiral groove 8, constitutes an active chip removal system, effectively solving the chip removal and heat dissipation problems in the chamfering of deep holes and blind holes, and further improving machining efficiency and tool life.

[0028] The right end of the connecting pipe 11 is fixedly connected to the rotating ring 10.

[0029] The rotating ring 10 is rotatably connected to the inner side of the guide plate 2 via a sealed bearing. By setting the rotating ring 10, the connecting pipe 11 is connected to the guide plate 2, so that when the tool holder 1 drives the connecting pipe 11 to rotate, the connecting pipe 11 drives the rotating ring 10 to rotate together, and the connecting pipe 11 and the guide plate 2 can be kept in communication.

[0030] The outer side of the guide plate 2 is fixedly connected to one end of the injection pipe 3. When using this device, the injection pipe 3 is connected to an external high-pressure coolant source, and the injection pipe 3 can be used to fix and limit the guide plate 2 and the fixing ring 4.

[0031] The upper end of the guide plate 2 is fixedly connected to the bottom surface of the fixing ring 4, and the inner side of the fixing ring 4 is rotatably connected to the outer surface of the tool holder 1 through a sealed bearing.

[0032] The working principle of this utility model is as follows: When using this tool for cutting, the bottom end of the tool holder 1 can be clamped by the tool fixture, and the injection pipe 3 can be connected to the high-pressure coolant source. During cutting, the tool holder 1 and the tool head 5 rotate at high speed. At this time, the tool holder 1 drives the connecting pipe 11 and the rotating ring 10 to rotate. During the cutting process, high-pressure coolant can be injected into the flow hole 9 through the injection pipe 3, the guide plate 2, and the connecting pipe 11. The high-pressure coolant in the flow hole 9 is sprayed onto the root of the chip through the outlet hole 6 to cool it down and flush away the chips.

[0033] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A three blade helical chamfering tool comprising a tool holder (1), characterised in that: The upper end of the handle (1) is fixedly connected to the bottom end of the cutter head (5). The cutter head (5) has three spiral grooves (8) so that the cutter head (5) forms three spiral cutting edges (7). Both the cutter head (5) and the handle (1) have interconnected guide holes (9). The cutter head (5) also has a liquid outlet hole (6) inside, which connects the guide hole (9) and one of the spiral grooves (8).

2. The three-bladed spiral chamfering tool according to claim 1, characterized in that: The bottom end of the guide hole (9) is fixedly connected to the left end of the connecting pipe (11).

3. The three-bladed spiral chamfering tool according to claim 2, characterized in that: The right end of the connecting pipe (11) is fixedly connected to the rotating ring (10).

4. The three-bladed spiral chamfering tool according to claim 3, characterized in that: The rotating ring (10) is rotatably connected to the inner side of the guide plate (2) via a sealed bearing.

5. The three-bladed spiral chamfering tool according to claim 4, characterized in that: The outer side of the guide plate (2) is fixedly connected to one end of the injection tube (3).

6. The three-bladed spiral chamfering tool according to claim 5, characterized in that: The upper end of the guide plate (2) is fixedly connected to the bottom surface of the fixing ring (4), and the inner side of the fixing ring (4) is rotatably connected to the outer surface of the tool holder (1) through a sealed bearing.

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