Raise the method of quality of triangular whorl CNC Turning

The trigonometry whorl of 5mm is exemple, if the graph is shown 1 times,process work, the turning quality that how improves triangular whorl undertakes discussing. Graph the influence of element of 1 of 1 part drawing 　 , craft to machining quality the main factor that the craft element of thread machining is influences of pair of thread machining quality, the craft factor that masters good thread machining is very main to improving thread machining quality. 1.

The logical choice cutting tool of material of 1 cutting tool and angle of cutting tool geometry should suffer effect of high pressure, high temperature and bigger attrition strength in cutting process, because this cutting tool wants to have tall hardness, tall hear resistance, good wearability, also want to have enough strength and tenacity. The stuff with intensity and good tenacity, its hardness and wearability are poorer, vice versa. The material with numerical control commonly used lathe tool has high-speed steel, hard alloy, pottery and porcelain and exceed hard data to wait. Differ according to the material of workpiece, choose suitable cutting tool, can improve spare parts quality, increase production efficiency and reduce cost. To thread tool, besides choosing right stuff, the geometrical angle of logical choice cutting tool and point of a knife transfer blade figure is very important to improving treatment quality. The geometrical angle of lathe tool has tool cutting edge angle, deputy slant dip of horn of horn, point of a knife, blade, before horn, hind horn and deputy hind horn. The main angle of whorl lathe tool is horn of point of a knife, the tooth that size of its knife sharp-angled decides whorl directly, lathe tool of common triangle whorl, blade dip is 10 ° commonly, horn of point of a knife is 59 ° 16, r = 0 of computation of formula of radius of circular arc of point of a knife.

The P in 144P(type is pitch) . Deputy slant part is the largest to influence of exterior surface roughness, tool cutting edge angle and deputy slant horn heals small, radius of round horn of point of a knife heals the whorl surface quality that treatment of big whorl lathe tool gives is lower. The horn after the horn before cutting tool is mixed heals big, cutting tool heals sharp, whorl surface quality is higher, but intensity becomes poor. 1.

Of 2 cutting dosage reasonable choose reasonable choose cutting dosage crucial to improving the treatment quality of numerical control lathe. Cutting dosage includes to bear quantity of penetration of a cutting tool, feed and cutting rate, the choice of whorl cutting dosage should machine the element such as the position locatedly to decide according to size of the material of workpiece, pitch and whorl. The cutting dosage of whorl should be reduced gradually, whorl essence Che Shigen seizes material sometimes optional 0 feed dosage. Through summary, listed turning steel kind dosage of commonly used cutting expresses the triangular whorl of material, if express,1 is shown. Express 1 steel kind speed of cutting of whorl of watch of dosage of commonly used cutting should choose the trigonometry whorl of material some lower, whorl of car of numerical control lathe basically is coder of support main shaft, when choice of main shaft rotate speed is exorbitant, the fixed position pulse that gives out through coder is possible because of " too strong " and bring about whorl sodden tooth, the numerical control of lathe of most numerical control 1.

The logical choice of 3 cutting fluid uses cutting liquid reasonably, because temperature is elevatory,can reduce the machining error that cause, cutting fluid forms lubricating film between cutting tool and workpiece surface, sweep scrap to reduce the attrition between cutting tool and workpiece, reduce cutting tool to wear away, improve the service life of cutting tool, prevent workpiece to rust. The commonly used cutting fluid in CNC Turning is emulsion, chroma is 5% -- 25% , some thread machining still can choose oil to be cutting fluid. In turning cast-iron when waiting for brittleness material, need not cutting fluid, it is easy to because break,cut bits with cutting fluid the motion of saddle of bed of lump block machine tool, can brush when car whorl a few when oily; uses the plasticity metal such as steel of cutting of high-speed steel cutting tool, aluminium, should use cutting fluid; to be able to cool completely when the discharge of cutting fluid when hard alloy cutting tool, can improve the service life of cutting tool, so the plasticity material such as turning steel in order to use cutting liquid had better. 1.

The outfit of the logical choice workpiece of method of clip of 4 workpiece outfit is placed must firm and have enough stiffness. Axis kind the spare parts uses 3 claw to hold clip directly from centering chuck commonly, it is good that below the premise that assures to machine length workpiece extends length Yue Xiaoyue, assure the treatment stiffness of workpiece, line of good stuff center as far as possible with coincide of line of main shaft center, in order to prevent dozen of knife. The method holding clip of workpiece must reasonable, will bring negative effect to the treatment quality of workpiece otherwise, cannot produce the advantage that high accuracy of numerical control lathe machines. The cutting means of the feed means whorl of cutting of 2, whorl basically is a basis pitch bulk will decide, suffer the effect of form of chamfer of material of cutting machine tool, workpiece, razor blade. The feed means of straight whorl cutting basically has the straight cutting that take form, inclined cutting that take form and right-and-left side alternant feed 3 kinds, if the graph is shown 2 times, the feed way that chooses whorl cutting correctly is very important also to the quality of thread machining. Graph means of feed of 2 screw cutting enters type cutting to show thread tool radial is direct namely continuously feed, call radial cutting again. The two side edge of whorl knife attended cutting, so cutting tool can offset each other in the cutting component of force of axial, cutting tool wears away even, lathe tool is brought about to slant because of axial cutting component of force when reducing screw cutting crooked phenomenon, the whorl tooth form of treatment is clear, quality is better. But because enter type cutting continuously,force concentration suffers when whorl, platoon bits not free, medicinal powder heat is bad to wait for an element, especially when turning is more than the pitch of 3mm above, because cutting deepness is big, edge wears away faster, cause screw center diameter easily to produce an error, so law of the straight cutting that take form applies to the screw cutting under 3mm. The inclined cutting that take form is to point to cutting tool with mixing radial becomes 27 ° -- the angle feed turning of 30 ° . In screw cutting, because its are cutting of odd side edge, cutting tool gets power lesser, platoon bits is fluent, medicinal powder hot effect is good, the whorl surface surface roughness that so treatment gives is a bit low. But edge is injured more easily and wear away, the whorl appearance that creates treatment to go out is not straight, horn of point of a knife produces change easily because of wearing away, the precision of whorl tooth form that treatment gives is poorer. Accordingly, the inclined cutting that take form suits to machine pitch to be in the whorl of 3mm above. Or so flank is alternant feed is to point to cutting tool every time when radial feed, cutting tool is transverse towards the left or move right the distance with certain motion, make lathe tool every time feed has a side blade to attend cutting only, the left and right sides undertakes alternately. Because this method process designing is more complex, the operation is inferior to going up the face goes to the lavatory two kinds, use at general lathe and pitch to be in commonly the thread machining of 3mm above. The process designing of CNC Turning of whorl of 3, triangle is with GSK980TD exemple, instruction of this system thread machining has wait for pitch whorl cutting instruction G32, change G76 of instruction of G92 of instruction of loop of cutting of G33 of instruction of loop of tap of axis of G34 of instruction of pitch whorl cutting, Z, whorl and loop of multiple whorl cutting] . G32 and G92 instruction can machine the straight whorl that waits for pitch, awl whorl, end panel whorl, cutting means belongs to the straight cutting that take form and opposite right side alternant cutting, g32 instruction belongs to single block, the process designing when walking along knife cutting for many times is longer, general and seldom with, the cutting means that G92 dictates belongs to the straight cutting that take form and right-and-left flank alternant cutting, because should dictate error of treatment screw center diameter is bigger, but tooth form precision is taller, general and multi-purpose the treatment at whorl of small pitch high accuracy. G76 instruction can machine the straight whorl that takes whorl to remove remaining part and awl whorl, can realize cutting of whorl of odd side edge, quantity of penetration of a cutting tool is reduced gradually, be helpful for protecting cutting tool, raise whorl precision, but cannot machine end panel whorl, because should dictate craft sex is more reasonable and process designing efficiency applies higher so relatively extensive. According to above analysis, the thread machining that the graph shows 1 times uses G92 statement, if the graph is shown 3 times,the whorl that G92 dictates takes cutter track way, a dot is nodded for the knife since whorl (terminus) , b dot is whorl cutting start, l1 is approach of whorl empty knife (L1 ≥ 2P) , l0 is whorl effective cutting quantity, l2 exits a quantity for whorl empty knife (L2 ≥ 0.

5P) , l3 retreats end width for whorl (install according to pitch when whorl did not retreat knife chamfer, 0) can think when having the chamfer that retreat a knife, c dot is cutting terminus, d dot retreats knife terminus for whorl radial. Pair of knife skill of the knife of operation skill whorl of the 4 of 　 of method taking a knife that graph 3 G92 dictates, thread machining, round lathe tool is opposite accurately outside thread tool unlike its position. Whorl axial is the range estimation point of a knife that relies on handlers and workpiece origin commonly to the knife whether coincide. It is when whorl axial demand is higher, as a result of the range estimation error of handlers, easy appear not accurate to the knife, had created cut appearance. Solve this problem, handlers can is opposite when the knife, in axial and radial direction obligate is measured to Dao Yu (whorl long axis stays more commonly 0.

5mm -- 1mm, whorl short axis stays more commonly 0.

2mm -- 0.

5mm) . Try through first cut, after measuring adjust a knife accurately to fill undertake correction (axial uses ± W, radial uses ± U) , ensure had not appeared to cut a phenomenon. After whorl knife is used for many times, when processing the data with the tall hardness such as alloy of stainless steel, nickel especially, cutting tool wears away faster, want to be measured more, workpiece is measuring qualification rear but debus, master cutting tool to wear away the rule, the knife can be revised to fill before the program moves, improve thread machining quality and manufacturing efficiency. 5, epilogue is in effective treatment production, besides the cutting tool that suits according to the choice such as workpiece material, pitch, choose appropriate process designing way even according to the pitch of whorl and treatment characteristic, agile ground uses thread machining statement, still can use treatment twice sometimes, dictate circularly (G76) and odd paragraph of instruction (the method that G32) photograph combines, produce the specialty of each instruction, assure the treatment quality of whorl. The knowledge on sound use in order to, can raise the percent of pass of thread machining effectively, assure the treatment quality of triangular whorl. Origin: Zhengzhou industry applies technical institute author: Niu Ruili CNC Milling CNC Machining