CN102728882A

CN102728882A - Tooth-back-cooling-mode-based special tool for helically milling composite material/titanium alloy

Info

Publication number: CN102728882A
Application number: CN2012102609689A
Authority: CN
Inventors: 刘刚; 王亚飞; 张恒; 柯臻铮; 柯映林; 董辉跃; 章明; 刘春�; 毕华东
Original assignee: Zhejiang University ZJU
Current assignee: Zhejiang University ZJU
Priority date: 2012-07-26
Filing date: 2012-07-26
Publication date: 2012-10-17
Anticipated expiration: 2032-07-26
Also published as: CN102728882B

Abstract

The invention discloses a tooth-back-cooling-mode-based special tool for helically milling a composite material/titanium alloy. The existing tool has short service life by adopting a bottom cooling mode. The tooth-back-cooling-mode-based special tool for helically milling the composite material/titanium alloy comprises a tool bar, a neck part and a cutting part, wherein the cutting part is connected with the tool bar by virtue of the neck part and consists of four cutter teeth, a cooling hole is arranged on the tooth back of each cutter tooth, four oblique cooling holes are led out from central holes passing through the axis of the tool bar, the aperture of each oblique cooling hole is smaller than that of the central hole, the axis direction directly faces towards the front tool surface of the end cutting edge of the tool, the peripheral cutting edge of the tool and each end cutting edge adopt double tool surfaces of a land, inside cutting edges at the ends of the four cutter teeth pass through the axis of the tool bar and are perpendicular, and three cutting edges are arranged at the end of each cutter tooth. The special tool for helically milling the composite material/titanium alloy can be used for effectively avoiding the plugging of the cooling holes, reducing the wear of the tool, improving the processing quality, prolonging the service life of the tool, increasing the radiation area, restraining the vibration in a cutting process, and decreasing the layering and burring phenomena.

Description

Composite/titanium alloy helical milling dedicated tool based on the back of tooth type of cooling

Technical field

The invention belongs to the helical milling manufacture field, be specifically related to a kind of composite/titanium alloy helical milling dedicated tool based on the back of tooth type of cooling.

Background technology

The helical milling technology is a kind of novel hole process technology, and in process, around the revolution of the center of machining hole, promptly the movement locus of cutter is a helix simultaneously for cutter rotation, axial feed, and this motion mode has determined helical milling to have the following advantages.One, eccentric processing can realize that single diameter cutter processes the hole of a series of diameters, improves the cutter utilization rate, reduces cost; Two, helical milling is discontinuous working angles, helps heat radiation; Three, tool diameter is littler than the hole, and smear metal is convenient discharges, and has improved the surface smoothness in hole; Four, can produce fine particle in the composite process, harmful, realize that through helical milling the processing of automation hole can effectively reduce human harm.

Along with the fast development of aerospace, these novel structural materials of titanium alloy and composite have obtained using widely.To these novel materials, traditional drilling technique can not satisfy requirement of products.For titanium alloy, traditional drilling technique is difficult to solve technical barriers such as outlet burr, surface smoothness; For composite, traditional drilling technique is difficult to avoid the phenomenon of layers of material because axial force is big, and product processing quality is uncontrollable.

At present, greatly developed helical milling equipment and helical milling dedicated tool abroad, and also obtained a lot of achievements, the application of success has all been arranged at Boeing and Air Passenger.But no matter China is being carried out strict blockade on new techniques aspect the helical milling abroad, be helical milling equipment or relevant cutter, from market, all is difficult to directly buy.

In China, University Of Tianjin, Nanjing Aero-Space University, Zhejiang University are obtaining fruitful work aspect the helical milling device.But supporting with it cutter research is also less relatively.Just be based on this background, we have invented the helical milling dedicated tool that is applicable to our domestic air mail material (titanium alloy, composite) on the basis that absorbs foreign advanced experience.

Summary of the invention

The present invention is directed to the deficiency of prior art, proposed a kind of composite/titanium alloy helical milling dedicated tool based on the back of tooth type of cooling.

A kind of composite based on the back of tooth type of cooling of the present invention/titanium alloy helical milling dedicated tool comprises knife bar, neck and cutting tip, and cutting tip is connected with knife bar through neck; Cutting tip is made up of four cutters tooth; Adopt two kinds of forms, and be symmetrically distributed in twos, not only on the peripheral cutting edge of cutter, adopting has the dual back of land knife face form; And also adopt the dual back knife face form of land at each end cutting edge of cutter; The end of each cutter tooth has three sections cutting edges, and the inboard cutting edge in the end of four cutters tooth is crossed knife bar axis and orthogonal, when the Tool in Cutting section diameter is D; Two pairs of cutter end cutting edge first points of a knife and second point of a knife are dislocatedly distributed, and are distributed in respectively on the circle that diameter is D/2 and 4D/5; Cross the centre bore of knife bar axis and draw four oblique cooling holes; The cooling holes opening is positioned on the back of tooth of cutter tooth; A cooling holes is all arranged on each cutter tooth back of tooth, and the aperture of each oblique cooling holes is less than centre bore, and its axis direction is the cutting edge rake face over against the cutter end.

A kind of composite based on the back of tooth type of cooling/titanium alloy helical milling dedicated tool is through perforate on the back of tooth of each cutter tooth; And end cutting edge rake face with the easiest generation wearing and tearing of cutter in the helical milling process of the direction of cooling holes; Smear metal is separated with rake face as early as possible and in time discharge; Reduce the friction between smear metal and the rake face, reduced the wearing and tearing of cutter and the generation of frictional heat effectively; Wherein the position of a pair of point of a knife is peripheral near cutter, and with another point of a knife is rationally misplaced, and can reduce the axial force in the Tool in Cutting process, reduces layering and burr phenomena, is more suitable for the especially processing of its laminated material of composite/titanium alloy; On the cutting edge of cutter, grind the dual back knife face of land; Point of a knife and cutting edge to being easy to wear and tear are strengthened; Enlarge area of dissipation, and can effectively suppress the vibration in the working angles, prolonged the life-span of cutter on the one hand; Improve working (machining) efficiency, also improved the crudy in hole on the other hand.

Beneficial effect of the present invention: 1) position of opening is become the back of tooth of cutter tooth, the cooling holes clogging that can effectively avoid smear metal to cause by traditional tools bottom; 2) through perforate on the back of tooth of each cutter tooth; And the direction that makes the hole over against the end cutting edge rake face; Can carry out more effective cooling to the cutter blade, simultaneously smear metal is separated as early as possible with rake face, reduce the wearing and tearing of cutter; Reduce the influence of frictional heat, improve the life-span of cutter when improving crudy cutter; 3) on the cutting edge of cutter, adopt the intensity that has the dual back of land knife face form can effectively increase cutting tip, increase the area of heat radiation, suppress the vibration in the working angles simultaneously; 4) cutter position of tool tip and the cutting edge profile after the optimization can effectively reduce axial cutting force, reduces layering and burr phenomena in composite/titanium alloy helical milling process.

Description of drawings

Fig. 1 is a cutter overall structure sketch map;

Fig. 2 is a cutter end pattern sketch map;

Fig. 3 is the B-B schematic cross-section;

Fig. 4 is the A-A schematic cross-section;

Fig. 5 is the C-C schematic cross-section.

The specific embodiment

As shown in Figure 1, a kind of composite based on the back of tooth type of cooling/titanium alloy helical milling dedicated tool comprises knife bar 3, neck 2 and cutting tip 1, and cutting tip 1 is connected with knife bar 3 through neck 2; As shown in Figure 2, cutting tip 1 is made up of four cutters tooth 5, adopts two kinds of forms; And be symmetrically distributed in twos, as shown in Figure 5, not only on the peripheral cutting edge of cutter, adopting has the dual back of land knife face form; And also adopt the dual back knife face form of land at each end cutting edge of cutter, and the end of each cutter tooth 5 has three sections cutting edges, and the inboard cutting edge 6 in the end of four cutters tooth 5 is crossed knife bar axis and orthogonal; When the Tool in Cutting section diameter is D; Like Fig. 3, shown in Figure 4, two pairs of cutter end cutting edge first points of a knife 7 and second point of a knife 9 are dislocatedly distributed, and are distributed in respectively on the circle that diameter is 4D/5 and D/2; Cross the centre bore 4 of knife bar axis and draw four oblique cooling holes 8; Cooling holes 8 openings are positioned on the back of tooth of cutter tooth 5; A cooling holes 8 is all arranged on each cutter tooth back of tooth, and the aperture of each oblique cooling holes 8 is less than centre bore 4, and its axis direction is the cutting edge rake face over against the cutter end.

Claims

1. based on the composite/titanium alloy helical milling dedicated tool of the back of tooth type of cooling, it is characterized in that: comprise knife bar, neck and cutting tip, cutting tip is connected with knife bar through neck; Cutting tip is made up of four cutters tooth; Adopt two kinds of forms, and be symmetrically distributed in twos, not only on the peripheral cutting edge of cutter, adopting has the dual back of land knife face form; And also adopt the dual back knife face form of land at each end cutting edge of cutter; The end of each cutter tooth has three sections cutting edges, and the inboard cutting edge in the end of four cutters tooth is crossed knife bar axis and orthogonal, when the Tool in Cutting section diameter is D; Two pairs of cutter end cutting edge first points of a knife and second point of a knife are dislocatedly distributed, and are distributed in respectively on the circle that diameter is D/2 and 4D/5; Cross the centre bore of knife bar axis and draw four oblique cooling holes; The cooling holes opening is positioned on the back of tooth of cutter tooth; A cooling holes is all arranged on each cutter tooth back of tooth, and the aperture of each oblique cooling holes is less than centre bore, and its axis direction is the cutting edge rake face over against the cutter end.