High-strength composite hard alloy milling cutter

Abstract

The utility model discloses a high-strength composite hard alloy milling cutter which comprises a milling cutter body and cutter teeth, the milling cutter body is provided with three cutting edge parts which are arranged at equal intervals along the circumferential direction, each cutting edge part is provided with a plurality of step grooves, the cutter teeth are fixed on the step grooves through bolts, and tooth cutting edge parts are formed at opposite angles of the cutter teeth. The tooth blade parts form cambered surface structures with the thickness gradually reduced towards the centers of the cutter teeth, the surfaces of the cutter teeth are coated with TiAlN coatings, and chip grooves are formed between every two adjacent blade parts. The tooth blade part is of a cambered surface structure which is gradually reduced towards the center of the cutter tooth, so that the resistance of cutting into a workpiece during cutting can be reduced, and the cutting is smoother; the TiAlN coating is coated on the cutter teeth, so that the hardness, the wear resistance and the heat resistance of the cutter teeth can be improved, the milling cutter is ensured not to be softened under a high-temperature condition, and the service life of the cutter is prolonged; due to the arrangement of the chip grooves, chips can be smoothly discharged in the rotating direction of the milling cutter, chip blockage is effectively reduced, and the machining efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the milling cutter field especially relates to a high strength composite hard alloy milling cutter. BACKGROUND

[0002] Milling cutter is a kind of multi-blade rotary cutter for metal cutting, mainly used for milling, by rotating the workpiece surface, to achieve the purpose of removing excess material, forming specific shape and size, milling cutter is usually installed on milling machine or numerical control machine tool, commonly used for plane, groove, profile and complex surface machining.

[0003] In the prior art, milling cutter will bear larger impact force and cutting resistance in high-speed cutting process, leading to the deformation, fracture and wear of cutting edge under high-strength cutting conditions, thereby reducing the service life and machining accuracy of milling cutter;In addition, a large amount of cutting chips will be generated during the cutting process of milling cutter, if the chip removal is not smooth, not only will increase the cutting resistance, but also will cause the milling cutter overheating, and then cause material softening, affect the hardness and wear resistance of the tool.

[0004] Therefore, the prior art has defects and needs to be improved. TECHNICAL PROBLEM

[0005] The utility model solves the technical problem that: provide a high strength composite hard alloy milling cutter with good heat dissipation performance, smooth chip removal and high wear resistance.

[0006] In order to achieve this purpose, the utility model adopts the following technical scheme: a high strength composite hard alloy milling cutter, including milling cutter body and cutter tooth, the milling cutter body is provided with three equidistantly arranged cutting edge parts along the circumferential direction, the cutting edge part is spirally arranged along the extension direction of the milling cutter body;

[0007] A plurality of stepped grooves are arranged on the cutting edge part, the height of the plurality of stepped grooves gradually decreases along the spiral direction away from the cutting edge part, the cutter tooth is fixed on the stepped groove through bolt, the thickness of the cutter tooth is less than the depth of the stepped groove, the tooth edge part is formed at the opposite angle of the cutter tooth, the tooth edge part is exposed to the side end of the stepped groove, the tooth edge part forms an arc surface structure with gradually decreasing thickness towards the center of the cutter tooth, the surface of the cutter tooth is coated with TiAlN coating, and the thickness of the TiAlN coating is 4-10 μm;

[0008] Adjacent two cutting edge parts form a chip removal groove, the rotation direction of the chip removal groove is same with the rotation direction of the cutting edge part, the end of the milling cutter body is provided with a bevel structure, and the bevel structure is used for guiding metal chips to be discharged from the chip removal groove.

[0009] Adopting the technical scheme, the high-strength composite hard alloy milling cutter has the cooling channel inside the milling cutter body for supplying the cooling medium.

[0010] The chip flute is provided with a plurality of guide holes along the extension direction of the chip flute, the guide holes are communicated with the cooling channel, and the guide holes are used for guiding and conveying the cooling medium in the cooling channel to the cutting edge part.

[0011] Adopting the technical scheme, the high-strength composite hard alloy milling cutter has the cooling channel inside the milling cutter body for supplying the cooling medium.

[0012] Adopting the technical scheme, the high-strength composite hard alloy milling cutter has the cooling channel inside the milling cutter body for supplying the cooling medium.

[0013] Adopting the technical scheme, the high-strength composite hard alloy milling cutter has the cooling channel inside the milling cutter body for supplying the cooling medium.

[0014] Adopting the technical scheme, the high-strength composite hard alloy milling cutter has the cooling channel inside the milling cutter body for supplying the cooling medium.

[0015] Adopting the technical scheme, the high-strength composite hard alloy milling cutter has the cooling channel inside the milling cutter body for supplying the cooling medium.

[0016] Compared with the prior art, the high-strength composite hard alloy milling cutter has the following beneficial effects:

[0017] The tooth cutting edge part is gradually reduced to the arc surface structure of the tooth center, the resistance of cutting into the workpiece can be reduced, the cutting is more smooth and smooth, the TiAlN coating is coated on the tooth, the hardness, wear resistance and heat resistance of the tooth can be improved, the milling cutter is not softened under high temperature conditions, and the service life of the tool is prolonged, the chip groove is arranged, the chip can be smoothly discharged along the rotation direction of the milling cutter, the chip blockage is effectively reduced, and the machining efficiency is improved, the cooling channel and the guide hole are arranged, the cooling medium can directly act on the cutting edge part, the tool is prevented from overheating, and the cooling medium can also assist in chip removal, and the machining process is more smooth. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without paying the creative labor intensity.

[0019] The structure, proportion, size and the like shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification, to be understood and read by those skilled in the art, and do not have technical substantive significance, and any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model.

[0020] Figure 1 It is a schematic view of the overall structure of the utility model;

[0021] Figure 2 It is another perspective view of the structure of the utility model;

[0022] Figure 3 It is a schematic view of the helix angle of the blade edge of the utility model;

[0023] Figure 4 It is a schematic view of the cooling channel structure of the utility model;

[0024] Figure 5 It is a schematic view of the blade tooth structure of the utility model. DETAILED DESCRIPTION

[0025] In order to make the utility model purposes, features, advantages of the utility model more obvious and easy to understand, the technical solutions in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the embodiments described below are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0026] In the description of the utility model, 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 used to facilitate the description of the utility model and simplify 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 on the utility model. 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.

[0027] The technical solutions of the utility model will be further described below in conjunction with the drawings and through specific embodiments.

[0028] As Figures 1 to 5As shown, an embodiment of the present invention provides a high-strength composite carbide milling cutter, including a milling cutter body 1 and a cutter tooth 2, wherein the milling cutter body 1 is provided with three blade portions 11 arranged at equal distances along the circumferential direction, and the blade portion 11 is spirally arranged along the extension direction of the milling cutter body 1, and a plurality of step grooves 110 are provided on the blade portion 11, and the height of the plurality of step grooves 110 gradually decreases along the spiral direction away from the blade portion 11, and the cutter tooth 2 is fixed to the step groove 110 by a bolt, and the thickness of the cutter tooth 2 is less than the depth of the step groove 110, and a tooth blade portion 21 is formed at the diagonal portion of the cutter tooth 2, and the tooth blade portion 21 is exposed at the side end of the step groove 110, and the thickness of the tooth blade portion 21 gradually decreases toward the center of the cutter tooth 2. The curved surface structure 210 of the tooth 2 is coated with a TiAlN coating, and the thickness of the TiAlN coating is 4-10 μm; the three blade portions 11 arranged equidistantly along the circumferential direction of the milling cutter body 1 can improve the balance of the milling cutter during the cutting process, reduce vibration, and improve processing stability; the curved surface structure 210 in which the tooth edge portion 21 gradually decreases toward the center of the tooth 2 can reduce the resistance of cutting into the workpiece during cutting, making the cutting process smoother; the exposed tooth edge portion 21 can concentrate the cutting on the cutting edge of the milling cutter, avoiding contact between the step groove 110 and the workpiece; the setting of the TiAlN coating not only increases the hardness and wear resistance of the tooth 2, but also has excellent heat resistance and oxidation resistance, effectively protecting the tooth 2 from softening at high temperatures, and improving the durability of the tooth 2.

[0029] like Figure 1 and Figure 2 As shown, a chip flute 12 is formed between two adjacent blade portions 11. The chip flute 12 has the same rotation direction as the blade portion 11. The chip flute 12 is provided with an inclined surface structure 120 at the end of the milling cutter body 1. The inclined surface structure 120 is used to guide metal chips out of the chip flute 12. In this embodiment, the spiral direction of the blade portion 11 and the chip flute 12 is right-handed. This arrangement allows chips to be discharged smoothly along the rotation direction of the milling cutter body 1, reducing chip accumulation and avoiding cutting resistance caused by chip blockage in the milling cutter, thereby improving processing efficiency.

[0030] like Figure 2 and Figure 4As shown, further, the milling cutter body 1 is internally provided with a cooling channel 10 for supplying cooling medium, the chip flute 12 is provided with a plurality of flow guide holes 101 along its extension direction, the flow guide holes 101 are in communication with the cooling channel 10, the flow guide holes 101 are used to guide the cooling medium in the cooling channel 10 to the cutting edge 11, so that the cooling medium is concentrated on the cutting area, thereby rapidly taking away the heat generated during cutting, preventing the milling cutter from softening or wearing due to overheating, and maintaining the sharpness and processing stability of the milling cutter; at the same time, the cooling medium sprayed from the flow guide holes 101 can also play an auxiliary role in chip removal, thereby flushing away the chips from the cutting area to avoid the accumulation of chips in the chip flute 12 causing blockage.

[0031] As shown in Figure 3 , further, the helix angle α of the cutting edge 11 is 30-45°, in this embodiment, the helix angle α of the cutting edge 11 is 40°, so arranged, the stress generated during cutting can be uniformly distributed along the axial direction of the milling cutter body 1, thereby improving the fracture resistance and strength of the milling cutter.

[0032] As shown in Figure 1 and Figure 2 , further, the number of teeth 2 on each group of cutting edges 11 is four. The number of teeth 2 on each group of cutting edges 11 is four, which avoids a single tooth 2 from bearing excessive load, thereby enhancing the structural strength of the milling cutter.

[0033] As shown in Figure 1 and Figure 2 , further, the end of the milling cutter body 1 is provided with a tool bar 3, and the tool bar 3 is in a cylindrical structure.

[0034] Further, the milling cutter body 1 is made of tungsten-cobalt hard alloy. Tungsten-cobalt hard alloy has extremely high hardness and wear resistance, and has certain toughness, so that the milling cutter is not easy to deform and wear during cutting, effectively improving the impact resistance and fracture resistance of the milling cutter.

[0035] The above-described embodiments are only used to illustrate the technical solutions of the present application, and 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 they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of 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 composite carbide milling cutter, characterized in that: The milling cutter comprises a milling cutter body and cutter teeth, wherein the milling cutter body is provided with three cutting edges arranged at equal intervals along the circumferential direction, and the cutting edges are spirally arranged along the extending direction of the milling cutter body; The blade portion is provided with a plurality of step grooves, the heights of the plurality of step grooves gradually decreasing along a spiral direction away from the blade portion, the teeth are fixed to the step grooves by bolts, the thickness of the teeth is less than the depth of the step grooves, a tooth edge portion is formed at a diagonal position of the teeth, the tooth edge portion is exposed at a side end of the step groove, and the tooth edge portion forms a curved surface structure with a thickness gradually decreasing toward the center of the teeth, and the surface of the teeth is coated with a TiAlN coating, and the thickness of the TiAlN coating is 4-10 μm; A chip groove is formed between two adjacent blade portions, and the rotation direction of the chip groove is the same as that of the blade portion. The chip groove is located at the end of the milling cutter body and is provided with a bevel structure, which is used to guide metal debris to be discharged from the chip groove.

2. The high-strength composite carbide milling cutter according to claim 1, characterized in that: A cooling channel is provided inside the milling cutter body, and the cooling channel is used to supply a cooling medium; The chip removal groove is provided with a plurality of guide holes along its extension direction. The guide holes are communicated with the cooling channel. The guide holes are used to guide the cooling medium in the cooling channel to be transported to the blade portion.

3. The high-strength composite carbide milling cutter according to claim 1, characterized in that: The helical directions of the blade portion and the chip removal groove are both right-handed.

4. The high-strength composite carbide milling cutter according to claim 3, characterized in that: The helical angle of the blade portion is 30-45°.

5. The high-strength composite carbide milling cutter according to claim 1, characterized in that: Each group of blade portions has four blade teeth.

6. The high-strength composite carbide milling cutter according to claim 1, characterized in that: A cutter bar is provided at the end of the milling cutter body, and the cutter bar is a cylindrical structure.

7. The high-strength composite carbide milling cutter according to claim 1, characterized in that: The milling cutter body is made of tungsten-cobalt hard alloy.

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