High-toughness welding type PCB end mill

Abstract

The utility model discloses a high strength and toughness welding type PCB end mill which comprises a cutter handle and a milling cutter head welded with the end portion of the cutter handle, four cutting edges arranged at intervals are formed on the edge of the end portion of the milling cutter head in the circumferential direction, and the surfaces of the cutting edges are coated with AlTiN coatings. A chip removal groove is formed between every two adjacent cutting edges, a chip removal guide block is arranged in the middle of the milling cutter head, a guide diversion groove is formed between the chip removal guide block and the chip removal groove, and a liquid outlet hole is formed in the side wall of the guide diversion groove. In the cutting working process, the four spiral cutting edges can gradually cut into a material and alternately act on a machining surface to balance stress, so that the machining efficiency and the toughness of the cutter are improved; the AlTiN coating is coated on the surface of the cutting edge, so that the hardness and the wear resistance of the cutting edge can be improved, and the wear of the cutting edge in a high-speed cutting process is reduced; the chip removal guide block can stir chips generated during cutting of the machining face and guide the chips to the chip removal groove to be discharged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of milling cutter especially relates to a high tough welding type PCB end mill. BACKGROUND

[0002] Printed circuit board (PCB) is the core component of electronic equipment, used to provide electrical connection and mechanical support for electronic components, and its processing quality directly affects the performance and reliability of electronic products. In the PCB manufacturing process, milling cutter is a commonly used cutting tool for edge cutting, slotting and forming processing of PCB board. Milling cutter applies cutting force to the material through cutting edge to realize material removal and shape processing.

[0003] In the prior art, PCB is a hard composite material, and the cutting load is large during processing. The cutting edge of the existing milling cutter is prone to wear during long-term machining operation, which is difficult to meet the precision machining requirements of high-density PCB board. In addition, a large amount of debris generated during processing accumulates in the cutting area, which can aggravate the wear and heat accumulation of the milling cutter, resulting in unstable processing due to thermal fatigue of the milling cutter, affecting the processing efficiency and quality of the product.

[0004] Therefore, the prior art has defects and needs to be improved. CONTENT OF THE UTILITY MODEL

[0005] The utility model solves the technical problem of providing a high tough welding type PCB end mill with chip removal function and not easy to wear.

[0006] To achieve this purpose, the utility model adopts the following technical scheme: a high tough welding type PCB end mill, comprising a handle and a milling cutter head welded with the end of the handle, four cutting edges are formed in the circumferential direction of the end edge of the milling cutter head, and the cutting edges are spirally arranged along the extension direction of the milling cutter head.

[0007] The surface of the cutting edge is coated with an AlTiN coating.

[0008] A chip removal groove is formed between the two adjacent cutting edges, the chip removal groove is spirally arranged along the extension direction of the milling cutter head, a chip removal guide block is arranged in the middle of the milling cutter head, and the chip removal guide block is used to stir the debris generated by the cutting edge during machining;

[0009] A guide diversion groove is formed between the chip removal guide block and the chip removal groove, the cross section of the guide diversion groove is in V-shaped structure, and the guide diversion groove is used to guide and convey the debris into the chip removal groove.

[0010] The guide diversion groove side wall is provided with a liquid outlet hole, the tool shank is internally provided with a liquid injection channel, the liquid injection channel is communicated with the liquid outlet hole, and the liquid injection channel is used for conveying cooling liquid into the liquid outlet hole for discharge.

[0011] According to the high-toughness welded PCB end mill, the cutting angle between the cutting edge and the axis of the milling head is 20-45°.

[0012] According to the high-toughness welded PCB end mill, the recess is gradually expanded from the opening to the top end.

[0013] According to the high-toughness welded PCB end mill, the edge of the chip removal guide block is provided with four upwardly arranged chip removal rods, and the chip removal rods are used for pushing the chips into the chip removal groove.

[0014] According to the high-toughness welded PCB end mill, the guide diversion groove is gradually inclined downward from inside to outside to form a slope structure.

[0015] According to the high-toughness welded PCB end mill, the cutting edge has an edge angle of 15-20°.

[0016] According to the high-toughness welded PCB end mill, the liquid outlet hole has a hole diameter of 0.4-2 mm.

[0017] According to the high-toughness welded PCB end mill, the milling head is made of tungsten steel hard alloy.

[0018] Compared with the prior art, the high-toughness welded PCB end mill has the following beneficial effects:

[0019] In the cutting process, the four spiral cutting edges can gradually cut into the material and alternately act on the machining surface to balance the stress, thereby improving the machining efficiency and the toughness of the tool; the AlTiN coating on the surface of the cutting edge can improve the hardness and wear resistance of the cutting edge, thereby reducing wear in the high-speed cutting process; in the cutting process, the chip removal guide block can play a stirring role to guide the chips into the chip removal groove through rotation disturbance in the moment of chip formation, thereby preventing the chips from accumulating near the cutting edge and causing machining interference. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0021] The structure, proportion, size and the like shown in the drawings of the present application are only used to cooperate with the content disclosed in the specification, so that those skilled in the art can understand and read, and are not used to limit the implementation conditions of the present application, so they do not have technical significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effect and purpose of the present application, should still fall within the scope of the technical content disclosed by the present application.

[0022] Figure 1 The present application is a schematic diagram of the overall structure of the present application.

[0023] Figure 2 The present application is another perspective schematic diagram of the overall structure of the present application.

[0024] Figure 3 The present application is a schematic diagram of the front structure of the present application.

[0025] Figure 4 The present application is a schematic diagram of the tail structure of the present application. DETAILED DESCRIPTION

[0026] In order to make the utility model purpose, features, advantages of the present application more obvious and easy to understand, the following will combine the drawings in the embodiment of the present application, the technical scheme in the embodiment of the present application is described clearly and completely, obviously, the following described embodiment is only a part of the embodiment of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the present application.

[0027] In the description of the present application, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there can be a component disposed therebetween.

[0028] The technical scheme of the utility model is further illustrated below in combination with the drawings and through specific embodiments.

[0029] As Figures 1 to 4 shown, the utility model discloses a kind of high tough welding type PCB end mill, including shank 2 and the milling cutter head 1 of welding with the end of shank 2, the end edge circumference direction of the milling cutter head 1 is formed with four cutting edges 10 of interval arrangement, the cutting edge 10 is spirally arranged along the extension direction of the milling cutter head 1;The surface of the cutting edge 10 is coated with AlTiN coating;In cutting work process, helical cutting edge 10 can gradually cut into material, disperse cutting force, reduce the cutting pressure that single cutting edge 10 bears, to reduce vibration and impact, improve the stability of cutting process;Four cutting edges 10 of interval arrangement can be alternatively acted on processing surface when rotating cutting, to balance stress, effectively improve processing efficiency and the toughness of tool;The hardness and wear resistance of cutting edge 10 can be improved by the AlTiN coating coated on the surface of cutting edge 10, so that it reduces wear in high-speed cutting process, and AlTiN coating has excellent high-temperature resistance, can effectively reduce heat accumulation in cutting process, prolong the service life of tool.

[0030] As Figure 1 and Figure 2 shown, chip flute 11 is formed between adjacent two cutting edges 10, and the chip flute 11 is spirally arranged along the extension direction of the milling cutter head 1, and the middle part of the milling cutter head 1 is provided with a chip guide block 12, and the chip guide block 12 is used to stir the chips generated when the cutting edge 10 cuts the processing surface;In the cutting process, the cutting edge 10 contacts the processing surface and gradually cuts into the material, and a large amount of chips are generated, and the spirally arranged chip flute 11 can orderly discharge these chips along the extension direction of the milling cutter head 1, so that the chips are prevented from being accumulated in the cutting area;The chip guide block 12 can play a stirring role, and can guide the chips into the chip flute 11 by rotating disturbance at the moment when the chips are formed, so that the chips are prevented from being accumulated near the cutting edge 10 to cause processing interference.

[0031] As Figure 2 shown, a guide flow dividing groove 13 is formed between the chip guide block 12 and the chip flute 11, the cross section of the guide flow dividing groove 13 is in V-shaped structure, and the guide flow dividing groove 13 is used to guide and convey the chips into the chip flute 11, so that the chips can smoothly enter the chip flute 11, and the chips are prevented from being accumulated to interfere with the cutting operation.

[0032] As Figure 2 and Figure 4As shown, the side wall of the guide flow distribution groove 13 is provided with a liquid outlet hole 14, and the inner part of the tool shank 2 is provided with a liquid injection channel 20, which is in communication with the liquid outlet hole 14, and the liquid injection channel 20 is used to deliver the cooling liquid to the liquid outlet hole 14 for discharge. During the cutting process, the cutting edge 10 will generate heat through friction when it contacts the workpiece. If these heat cannot be dissipated in time, it will not only cause the temperature of the tool to rise, but also cause thermal fatigue and even softening, resulting in thermal deformation or burning of the processed material, thereby affecting the machining precision and surface quality. By providing the liquid injection channel 20 in the tool shank 2, the cooling liquid can be delivered to the liquid outlet hole 14 for discharge, and through the guide effect of the V-shaped guide flow distribution groove 13, not only the heat generated during cutting can be removed, but also the dust and debris generated during cutting can be reduced, thereby improving the safety and cleanliness of the machining environment.

[0033] As shown in Figure 3 Further, the cutting angle a between the cutting edge 10 and the axis of the milling cutter head 1 is 20-45°. In this embodiment, the cutting angle a between the cutting edge 10 and the axis of the milling cutter head 1 is 40°. By setting the cutting angle a to 40°, the cutting resistance can be effectively reduced, and the cutting process can be more smooth and stable, thereby avoiding stress concentration at the sharp edge, and reducing the risk of tool wear and edge collapse.

[0034] As shown in Figure 1 and Figure 2 Further, a recessed part 120 is formed in the middle of the chip removal guide block 12, and the recessed part 120 is gradually expanded from the opening to the top end. The gradually expanded structure of the recessed part 120 can form a gradually widened space, so that the chip removal guide block 12 can use the synergistic effect of centrifugal force and gravity to transport the chips to the chip removal groove 11, thereby improving the chip removal efficiency. In this embodiment, the edge of the chip removal guide block 12 is provided with four upwardly arranged chip removal rods 121, which can push the chips into the chip removal groove 11.

[0035] As shown in Figure 1 Further, the guide flow distribution groove 13 is gradually inclined downward from the inside to the outside to form a slope structure. By setting the guide flow distribution groove 13 in this way, the chips can be smoothly guided into the chip removal groove 11, and the accumulation of chips in the guide flow distribution groove 13 can be avoided.

[0036] As shown in Figure 3 Further, the edge angle β of the cutting edge 10 is 15-20°. In this embodiment, the edge angle β of the cutting edge 10 is 17°. By setting the edge angle β to 17°, the cutting edge 10 not only has sufficient sharpness to easily cut into the material and reduce the resistance in the initial cutting stage, but also can avoid the edge collapse phenomenon caused by stress concentration due to the excessively sharp edge.

[0037] Further, the hole diameter of the liquid outlet hole 14 is 0.4-2mm, and in the embodiment, the hole diameter of the liquid outlet hole 14 is 1mm, so that the uniform spraying of the cooling liquid can be realized, and the structural strength of the cutter is considered.

[0038] Further, the milling cutter head 1 is made of tungsten steel hard alloy. The tungsten steel hard alloy has high hardness, excellent wear resistance, good impact resistance and toughness, so that the cutter is not damaged due to instantaneous impact force in the process of high-speed rotary cutting.

[0039] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A high-strength, welded PCB end mill characterized by, The cutter includes a handle and a milling cutter head welded to the end of the handle, and four cutting edges are formed on the end edge of the milling cutter head in the circumferential direction, and the cutting edges are spirally arranged along the extension direction of the milling cutter head. The surface of the cutting edge is coated with an AlTiN coating. A chip removal groove is formed between two adjacent cutting edges, and the chip removal groove is spirally arranged along the extension direction of the milling cutter head, and a chip removal guide block is arranged in the middle of the milling cutter head, and the chip removal guide block is used to stir the chips generated by the cutting edge when machining the surface. A guide diversion groove is formed between the chip removal guide block and the chip removal groove, and the cross section of the guide diversion groove is in a V-shaped structure, and the guide diversion groove is used to guide and convey the chips into the chip removal groove. The side wall of the guide diversion groove is provided with a liquid outlet hole, and the inside of the handle is provided with a liquid injection channel, and the liquid injection channel is in communication with the liquid outlet hole, and the liquid injection channel is used to convey the cooling liquid into the liquid outlet hole.

2. The high-stiffness, high-toughness, welded PCB end mill of claim 1, wherein, The cutting angle between the cutting edge and the axis of the milling cutter head is 20-45°.

3. The high-stiffness, high-toughness, welded PCB end mill of claim 1, wherein: A recess is formed in the middle of the chip removal guide block, and the recess is gradually expanded from the opening to the top end.

4. The high-stiffness, high-toughness, welded PCB end mill of claim 3, wherein, The edge of the chip removal guide block is provided with four upwardly arranged chip removal rods, and the chip removal rods are used to push the chips into the chip removal groove.

5. The high-stiffness, high-toughness, welded PCB end mill of claim 1, wherein, The guide diversion groove is gradually inclined downward from the inside to the outside to form a slope structure.

6. The high-stiffness, high-toughness, welded PCB end mill of claim 1, wherein, The edge angle of the cutting edge is 15-20°.

7. The high-stiffness, high-toughness, welded PCB end mill of claim 1, wherein: The aperture of the liquid outlet hole is 0.4-2mm.

8. The high-stiffness, high-toughness, welded PCB end mill of claim 1, wherein: The milling cutter head is made of tungsten steel hard alloy.

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