CN202317206U - Milling cutter used for processing titanium alloy - Google Patents

Abstract

The utility model discloses a milling cutter for processing titanium alloy, which is composed of a shank and a cutting part, and the cutting part includes an end face cutting edge, a peripheral cutting edge and a chip groove between two adjacent peripheral cutting edges , the effective cutting edge length is L, and the effective cutting edge length L is within the L1 length range extending from the end face cutting edge to the shank, the diameter of the outer circle formed by the core thickness of the milling cutter is d1, and the effective cutting edge In the remaining length range of blade length L, the diameter of the outer circle formed by the core thickness of the milling cutter is d2, d2>d1, L1=(0.25-0.55) L; on the radial section, after the groove of the outer peripheral cutting edge Both the cutter face and the rake face of the groove are concave arcs, and the concave arcs corresponding to the flank of the groove are respectively tangent to the concave arcs corresponding to the outer circle and the rake face of the groove. The milling cutter for processing titanium alloy takes into account the rigidity of the cutter and the chip space, can greatly improve the tool life, and reduce the processing cost.

Description

Milling cutters for machining titanium alloys

technical field

The utility model relates to the field of metal cutting, in particular to a milling cutter for processing titanium alloy.

Background technique

In the field of metal cutting, titanium alloy has low thermal conductivity and small deformation coefficient. It is a typical difficult-to-machine material. Especially in milling, there are high requirements for the rigidity and chip space of the milling cutter. Ordinary end mills are difficult to meet the requirements of tool rigidity and chip space, because ensuring better rigidity will result in a small tool chip space, and ensuring a larger chip space will result in poor tool rigidity. When machining titanium alloys, it is particularly important to design a tool that can meet both tool rigidity and chip space requirements.

Patent document CN201455382U discloses a variable-groove milling cutter, the milling cutter adopts a parabolic groove, the cross-sectional figure of the groove is y=ax ² +bx+c, within the length of L1, the core thickness is d1; outside the length of L1, The core thickness is d2, and d2 is 1.4 times d1. Although the milling cutter has been optimized, the groove shape of the milling cutter is only composed of a section of parabola, which is not conducive to the adjustment and processing of the groove shape; secondly, the difference between the unequal core thickness d1 and d2 is too large, so a large gap will be formed at L1 Mutation, thus reducing the strength of the knife.

Utility model content

The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art, and provide a milling cutter for processing titanium alloys that takes into account the rigidity of the cutter and the chip space, can greatly improve the cutter life, and reduce the processing cost.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

A milling cutter for processing titanium alloys, consisting of a shank and a cutting portion, the cutting portion includes a face cutting edge, a peripheral cutting edge and a chip flute between two adjacent peripheral cutting edges, the effective cutting edge is long is L, the effective cutting edge length L extends from the end face cutting edge to the shank within the L1 length range, the diameter of the outer circle formed by the core thickness of the milling cutter is d1, and the effective cutting edge length L is the remaining length Within the range, the diameter of the outer circle formed by the core thickness of the milling cutter is d2, d2>d1, L1=(0.25-0.55) L; on the radial section, the groove flank and groove front of the outer peripheral cutting edge The cutter faces are all concave arcs, and the concave arcs corresponding to the flank of the groove are respectively tangent to the concave arcs corresponding to the outer circle and the rake face of the groove.

The diameter of the milling cutter is D, 0.55D≤d1≤0.7D, 1.1d1≤d2≤1.3d1.

The radius of the concave arc of the groove flank on the radial section is r ₁ , 0.5D≤r ₁ ≤1.5D, the radius of the concave arc of the groove rake surface on the radial section is _r2 , _{0.15D≤r2≤0.18D} .

The helix angle β of adjacent peripheral cutting edges differs by 1°-3°.

Compared with the prior art, the utility model has the advantages of:

The milling cutter used for processing titanium alloy of the utility model has two values for the diameter of the outer circle formed by the core thickness of the milling cutter within the range of the entire blade length L. When the milling cutter of the utility model is used to process titanium alloy, the front milling The cutter core is small in thickness and diameter, and has a large space for chips, which is beneficial to the feeding of the cutter. The thick rear end milling cutter core ensures the rigidity of the milling cutter, reduces the deflection of the cutter, and ensures the machining accuracy. It can be seen that the utility model adopts this The structure with changing core thickness and diameter not only improves the rigidity of the tool, but also increases the chip space, which has obvious advantages when used in titanium alloy processing; at the same time, in the radial section, the flank and groove of the peripheral cutting edge The rake faces are all concave arcs, and the concave arcs corresponding to the flank tool of the groove are tangent to the concave arcs corresponding to the outer circle and the rake face of the groove respectively. Chip removal can effectively avoid the destructive extrusion of chips on the peripheral cutting edge, which can greatly improve the service life of the tool. The helix angle β of adjacent peripheral cutting edges differs by 1° to 3°, which is an unequal helix angle structure, which can reduce tool vibration and greatly improve the surface quality of the workpiece.

Description of drawings

Fig. 1 is the front view of the utility model.

Fig. 2 is an enlarged radial section view of the cutting part of the present invention.

Each label in the figure means:

1. Shank; 2. Cutting part; 3. Face cutting edge; 4. Peripheral cutting edge; 5. Chip flute;

Detailed ways

Fig. 1 and Fig. 2 have shown a kind of milling cutter embodiment that is used for processing titanium alloy of the present utility model, and this milling cutter is a four-edged milling cutter, is made up of shank 1 and cutting part 2, and cutting part 2 includes face cutting Edge 3, peripheral cutting edge 4 and chip flute 5 located between adjacent two peripheral cutting edges 4, the effective cutting edge length is L, and the effective cutting edge length L extends from the end face cutting edge 3 to the shank 1 length range of L1 Inside, the diameter of the outer circle formed by the thick core of the milling cutter is d1, and within the remaining length of the effective cutting edge length L, the diameter of the outer circle formed by the thick core of the milling cutter is d2, d2>d1, L1=(0.25～0.55) L, in this embodiment, L=13mm, L1=0.5L=6.5mm. Titanium alloy is a kind of material that is difficult to process. Its thermal conductivity is low and its deformation coefficient is small. When processing titanium alloy with the milling cutter of the utility model, the core thickness and diameter of the front milling cutter are small, and the space for chip holding is large, which is conducive to cutting. The thick core of the rear end milling cutter ensures the rigidity of the milling cutter, reduces the deflection of the cutter, and ensures the machining accuracy. It can be seen that the structure of the core thickness and diameter change adopted by the utility model not only improves the rigidity of the cutter, but also The chip space is increased, which has obvious advantages when it is used for titanium alloy processing; at the same time, in the radial section, the groove flank 6 and groove rake face 7 of the peripheral cutting edge 4 are concave arcs, and the groove flank The concave arc corresponding to 6 is tangent to the concave arc corresponding to the outer circle 8 and the groove rake face 7 respectively. The groove is smooth and smooth without the existence of steep walls, which can smoothly remove chips and effectively avoid cutting chips to the periphery. The destructive extrusion of blade 4 can greatly improve the tool life.

In this embodiment, the diameter of the milling cutter is D, 0.55D≤d1≤0.7D, 1.1d1≤d2≤1.3d1, the radius of the concave arc of the groove flank 6 on the radial section is r ₁ , 0.5D≤ r ₁ ≤ 1.5D, the radius of the concave arc of the groove rake face 7 on the radial section is r ₂ , 0.15D ≤ r ₂ ≤ 0.18D, in this embodiment, D=6mm, d1=0.62D=3.72 mm, d2=1.2d1=4.464mm, _r1 =0.8D=4.8mm, _r2 =0.17D=1.02mm. The helix angles β of adjacent peripheral cutting edges 4 differ by 1° to 3°, the four helix angles in this embodiment are 38°, 40°, 38° and 40° respectively, and the difference between adjacent helix angles β is 2°, which is not The equal helix angle structure can reduce tool vibration and greatly improve the surface quality of the workpiece.

The above are only preferred embodiments of the utility model, and do not limit the utility model in any form. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person familiar with the art, without departing from the scope of the technical solution of the present utility model, can use the technical content disclosed above to make many possible changes and modifications to the technical solution of the utility model, or modify it into an equivalent change, etc. effective example. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention shall fall within the protection scope of the technical proposal of the present invention.

Claims (4)

1. A milling cutter for processing titanium alloys, consisting of a shank (1) and a cutting portion (2), the cutting portion (2) includes an end face cutting edge (3), a peripheral cutting edge (4) and a In the chip flute (5) between two adjacent peripheral cutting edges (4), the effective cutting edge length is L, and it is characterized in that: the effective cutting edge length L extends from the end face cutting edge (3) to the shank ( 1) Within the extended length range of L1, the diameter of the outer circle (8) formed by the thickness of the milling cutter core is d1, and the length of the effective cutting edge is L. In the remaining length range, the outer circle (8) formed by the thickness of the milling cutter core ( 8) The diameter is d2, d2>d1, L1=(0.25～0.55) L; on the radial section, the groove flank (6) and groove rake surface (7) of the peripheral cutting edge (4) All are concave arcs, and the concave arcs corresponding to the groove flank (6) are respectively tangent to the concave arcs corresponding to the outer circle (8) and the groove rake face (7). 2. The milling cutter for processing titanium alloy according to claim 1, characterized in that: the diameter of the milling cutter is D, 0.55D≤d1≤0.7D, 1.1d1≤d2≤1.3d1. 3. The milling cutter for processing titanium alloy according to claim 2, characterized in that: the radius of the concave arc of the flank (6) on the radial section is r ₁ , 0.5D≤r ₁ ≤ 1.5D, the radius of the concave arc on the radial section of the groove rake face (7) is r ₂ , 0.15D ≤ r ₂ ≤ 0.18D. 4. The milling cutter for processing titanium alloy according to any one of claims 1 to 3, characterized in that: the helix angle β of adjacent peripheral cutting edges (4) differs by 1°-3°.

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