Treatment gives the new technology of high accuracy aperture

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  • source:YESCOM CNC Machining
A lot of but the problem of broach of dislocation razor blade depends on them is by the cutting of two razor blade blade is handed in fold and generate correct cutting diameter, although broach has,so two discharge bits chamfer, the function of bit is to form a Chan Ren but the cutting blade of asymmetry. This kind of design is lopsided substantially. Accordingly, but dislocation broach must be mixed in speed of feed of the rein in when entering cutting reduce feed, force an user to have balance between economy and productivity. The lopsided another issue that cuts a course is the precision of aperture. Typically, but the central razor blade of dislocation broach is cut above all, this meeting produces very great radial cutting power, cause drill pipe easily deflective. Once broach deviate center, it cannot machine the opening that gives high accuracy. because of these reasons, but dislocation broach normally the rough machining of aperture of bureau be confined to. When the public errand of aperture the requirement is less than 0.

012 ～ 0.

016 inches when, be necessary to be in can increase to machine working procedure together after dislocation broach. Latter, manufacturer of a few tool has been checked again but broach of dislocation razor blade, seek the means of the defect with the inherent cutting lopsided power in overcoming them to design. One of positive result of the closest research and development in these range of products are Sandvik Coromant company (Fair Lawn, new Jersey) the CoroDrill 880 that roll out. Introduce according to Bruce Carter of Sandvik product expert, this kind but the problem that the design of dislocation broach avoided to arise by lopsided cutting force, because this improved the quality of productivity and aperture, maintained bit to have the economy of blade of 4 usable cutting at the same time. Among them key is this company calls " the technology that divide a pace " concept. This phrase described blade of the cutting on bit " progressively " the ground enters work, can reduce greatly allegedly with the past but dislocation broach is relevant the radial cutting force of couplet. The razor blade that this concept involves point of view of two kinds of different geometry and different cutting are characteristic. Central razor blade has figure of a kind of apparent irregular cutting blade, and outside predestined relationship razor blade combined a kind of Xiu Guangren groove. In the first stage that enters work, the quoin of central razor blade contacts workpiece. This makes broach begins cutting with relatively inferior radial load, of drill pipe deflective the smallest change. In the 2nd pace, the quoin of predestined relationship razor blade contacts workpiece outside. This balanced the power that central razor blade produces. In the 3rd pace also namely in last pace, the odd part of central razor blade begins cutting. Mr Carter says, through cut a process to be divided into 3 relatively lesser step, cutting power decreases to be less than broach of those typical razor blade to machine the in part that produces cutting power, and cutting force mutual the brings about entry point evenly drill pipe between is deflective was eliminated actually. Of the balance get process, inferior radial cutting force and deflective amount the smallest the profit that the combination that transform has as follows: The precision of ◆ aperture is taller. ◆ feed has raise the feasibility of 100% , depend on workpiece material. ◆ is being gotten cut hole depth to amount to there is hope more when fourfold or the diameter is times morer. ◆ eliminates follow-up aperture to machine the possibility of demand, depend on precision requirement. Another mentioned advantage is to should design razor blade of the predestined relationship outside making to have blade of cutting of 4 complete practicable. If feed prep above 0.

005ipr, of razor blade of certain outfit in the right way but dislocation broach is met loss blade of the 4th cutting. But had the technology that divide a pace, the appearance of central razor blade of extraordinary can be as high as 0 in feed.

Blade of the 4th cutting still can be protected when 013ipr. Final Mr Carter points out, technology of use the blade that repair light goes up to be able to generate admirable exterior surface roughness along bit outside, although feed is taller,having this kind of new design also is such. In the experiment, it is in feed 0.

Surface roughness of the surface when 004ipr can be achieved 20 small inch (be equal to 1 inch 1/1000000) ; And surface roughness of the surface when feed is as high as can be amounted to 80 to 120 small inch. CNC Milling CNC Machining