CN206200209U - A kind of cubic boron nitride screw-on cutter - Google Patents

Abstract

The utility model discloses a cubic boron nitride spiral milling cutter. , the cutter bar includes a rod core and a peripheral edge, and the handle, cutter bar, and bottom edge rotate along the same central axis, and the cutter bar is provided with a spiral groove for chip removal, and the spiral groove extends from the bottom edge to the The direction of the knife handle is smoothly transitioned, the knife bar is made of polycrystalline cubic boron nitride material, the knife handle is made of hard alloy material, the knife bar is fixedly connected to the knife handle by welding, and the bottom edge is provided with a front knife The two opposite wide rake faces are connected to each other by narrowing the rake face, and the chip flute communicates with the spiral groove. The cubic boron nitride spiral milling cutter has sharp cutting edge, good cutting performance, high surface quality of the machined surface, and greatly reduces production cost.

Description

A Cubic Boron Nitride Spiral Milling Cutter

technical field

The utility model relates to a milling cutter, in particular to a cubic boron nitride spiral milling cutter.

Background technique

In recent years, with the development of science and technology, the machinery manufacturing industry has higher and higher requirements for machining accuracy. As a common tool for machining, the structure of milling cutter not only determines its own strength and service life, but also determines the quality of drilling. The error size and precision of the workpiece hole.

In aerospace, aviation, military industry, and automobile fields, a large number of composite materials are used, and the dimensional accuracy and smoothness of the machining aperture are required to be high. At the same time, the technical requirements and service life of the machining tool itself are getting higher and higher. Although the cutting tool can meet some requirements, it has a short service life and wears out quickly when processing high-hardness steel materials. Especially when processing high-hardness new materials such as alloys containing iron elements, the processing finish is poor with ordinary milling cutters, resulting in product apertures Dimensional consistency is not good, and the defect rate is high, which seriously affects the processing accuracy and the service life of the processed products is short. However, diamond milling cutters are not suitable for processing materials containing iron elements because diamond has an affinity for iron elements. In addition, due to the unreasonable structural design of the existing milling cutter, its own strength and service life are affected.

Utility model content

The purpose of the utility model is to provide a cubic boron nitride helical milling cutter to solve the problems raised in the above-mentioned background technology.

In order to achieve the above object, the utility model provides the following technical solutions: a cubic boron nitride spiral milling cutter, comprising a spiral milling cutter body, the spiral milling cutter body comprising a handle, a cutter bar connected to one end of the handle, The bottom edge is arranged at the front end of the cutter bar. The cutter bar includes a core and a peripheral edge. The handle, the cutter bar, and the bottom edge rotate along the same central axis. The cutter bar is provided with a spiral groove for chip removal. The spiral groove smoothly transitions from the bottom edge to the handle, the handle is made of polycrystalline cubic boron nitride material, the handle is made of hard alloy material, and the handle is welded and fixedly connected to the handle. The bottom edge is provided with a rake face and a chip flute, and two opposite wide rake faces are connected to each other by narrowing the rake face, and the chip flute communicates with the spiral groove.

Preferably, the bottom edge rake angle of the bottom edge is 2°. The bottom edge rake angle is the angle between the bottom edge rake face and the axis. Preferably, the first relief angle of the bottom edge of the bottom edge is 10°. Preferably, the second relief angle of the bottom edge of the bottom edge is 16°. In this way, axial process machining can be performed by the bottom edge.

Preferably, the rake angle of the peripheral cutting edge is 12°. The rake angle of the peripheral edge is the angle formed by the rake face of the peripheral edge and the line connecting the tool tip and the center, which is an important factor affecting the cutting performance of the end mill.

Preferably, the first clearance angle of the peripheral cutting edge is 12°. At this angle, the cutting edge of the peripheral edge of the cubic boron nitride spiral milling cutter is relatively sharp, and the strength of the cutting edge is relatively strong, so that vibration, edge curling and chipping are prone to occur during machining.

Preferably, the second clearance angle of the peripheral cutting edge is 24°. The second relief angle of the peripheral edge ensures sufficient clearance between the workpiece and the milling cutter when the milling cutter is cutting.

Compared with the prior art, the beneficial effect of the utility model is: the cubic boron nitride helical milling cutter makes full use of the polycrystalline cubic boron nitride material with high hardness and low affinity with the processed material. The hardness of the material to be cut is very high, and there will be no edge curling, chipping, vibration, etc. At the same time, it has a sharp edge, good cutting performance, high surface quality of the processed surface, stable chips, wide application range, and high processing accuracy. Advanced features greatly reduce production costs.

Description of drawings

Fig. 1 is the front structural schematic diagram of the utility model embodiment;

Fig. 2 is the sectional structure schematic diagram of the utility model embodiment cutter bar;

Fig. 3 is a left view structural schematic diagram of the bottom edge of the utility model embodiment;

Fig. 4 is the structural representation of BB section in Fig. 3;

Fig. 5 is a partial enlarged structural schematic diagram of part K in Fig. 3;

Among them: 1. Shank, 2. Arbor, 3. Spiral groove, 4. Circumferential edge, 5. Bottom edge, 6. Rod core, 7. Chip flute, 8. Wide rake face, 9. Narrowing front Cutter face, 10. Bottom edge rake angle, 11. Bottom edge first relief angle, 12. Bottom edge second relief angle, 13. Circumferential edge rake angle, 14. Circumferential edge first relief angle, 15. Circumferential edge second relief angle rear corner.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4, and Fig. 5, a cubic boron nitride helical milling cutter includes a helical milling cutter body, and the helical milling cutter body includes a handle 1, which is connected to the cutter The knife bar 2 at one end of the handle 1, the bottom edge 5 arranged at the front end of the knife bar 2, the knife bar 2 includes a rod core 6, a peripheral edge 4, and the knife handle 1, knife bar 2, and bottom edge 5 are along the same central axis Working in rotation, the cutter bar 2 is provided with a spiral groove 3 for chip removal, and the spiral groove 3 transitions smoothly from the bottom edge 5 to the handle 1, and the cutter bar 2 is made of polycrystalline cubic boron nitride material, so The handle 1 is made of cemented carbide, the handle 2 is welded and fixedly connected to the handle 1, the bottom edge 5 is provided with a rake face and a chip flute 7, and two opposite wide rake faces 8 The chip pockets 7 communicate with the helical flutes 3 by interconnecting the narrowing rake faces 9 .

3 and 4, the bottom edge rake angle 10 of the bottom edge 5 is 2°. The bottom edge rake angle 10 is the angle between the bottom edge rake face and the axis. The bottom edge first relief angle 11 of the bottom edge 5 is 10°. The bottom edge second relief angle 12 of the bottom edge 5 is 16°. In this way, axial progress machining can be performed by the bottom edge 5 .

Referring to Fig. 2, the rake angle 13 of the peripheral cutting edge 4 is 12°. The rake angle 13 of the peripheral edge is the angle formed by the rake face of the peripheral edge 4 and the line connecting the tool tip and the center, and it is an important factor affecting the cutting performance of the end mill. The first relief angle 14 of the peripheral cutting edge 4 is 12°. At this angle, the cutting edge of the cubic boron nitride helical milling cutter peripheral edge 4 is sharper, and the strength of the cutting edge is stronger, so that vibration, edge curling and chipping are not easy to occur during processing. The second relief angle 15 of the peripheral cutting edge 4 is 24°. The second relief angle 15 of the peripheral edge ensures sufficient clearance between the workpiece and the milling cutter when the milling cutter is cutting.

Tests have shown that the cubic boron nitride spiral milling cutter of the utility model example can achieve 30-50 times the life of ordinary tungsten steel milling cutters, effectively reduce the work of changing tools, adjusting tools, and setting tools, and improve work efficiency. 5-10 times that of tungsten steel milling cutter, which greatly reduces the production cost.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes and modifications can be made to these embodiments without departing from the principle and spirit of the present invention , replacements and modifications, the scope of the present utility model is defined by the appended claims and their equivalents.

Claims (7)

1. a kind of cubic boron nitride screw-on cutter, including screw-on cutter body, it is characterised in that the screw-on cutter body includes Handle of a knife, the knife bar for being connected to described handle of a knife one end, the shear blade located at knife bar front end, the knife bar include bar core, circumference sword, described , along same central axis rotary work, the knife bar is provided with the helicla flute for chip removal, the helicla flute for handle of a knife, knife bar, shear blade From shear blade to handle of a knife directional smoothing transition, the knife bar is Polycrystalline Cubic Boron Nitride, and the handle of a knife uses hard alloy material Material, the knife bar is welded and fixed with the handle of a knife and is connected, and the shear blade is provided with rake face, chip pocket, two relative preceding knives wide Face is connected with each other by narrowing rake face, and the chip pocket is communicated with helicla flute.

2. cubic boron nitride screw-on cutter according to claim 1, it is characterised in that the shear blade anterior angle of the shear blade is 2°。

3. cubic boron nitride screw-on cutter according to claim 2, it is characterised in that the relief angle of shear blade first of the shear blade It is 10 °.

4. cubic boron nitride screw-on cutter according to claim 3, it is characterised in that the relief angle of shear blade second of the shear blade It is 16 °.

5. the cubic boron nitride screw-on cutter according to claim 1,2,3 or 4, it is characterised in that the circle of the circumference sword Rake angle is 12 °.

6. cubic boron nitride screw-on cutter according to claim 5, it is characterised in that the circumference sword first of the circumference sword Relief angle is 12 °.

7. cubic boron nitride screw-on cutter according to claim 6, it is characterised in that the circumference sword second of the circumference sword Relief angle is 24 °.