Echelon whorl is reached into the design of group tap make

Into the design of group tap the analysis adjusts whorl to cover the treatment of 8-7H of × of Tr28 of the whorl inside echelon, manufacturer is former it is with the whorl inside echelon on center lathe C630 lathe tool undertakes turning is machined. But as a result of the nominal diameter of this echelon whorl length of big, whorl grows small, pitch, to avoid to be when turning lathe tool and workpiece generate interference, because this arbor dimension is lesser, rigid poor, make knife phenomenon serious when turning so, create work depth of two upright whorl is differ, short of design asks. In the meantime, labor strength of the worker is great, taller to operation level requirement of the worker, because this manufacturer hope can use tap,have the treatment of this product. Pass an analysis knowable, workpiece hardness is taller, the pitch of echelon whorl and tooth sectional bigger, because this should be used,undertake machining into group tap. (1) the diameter echelon whorl such as the consideration becomes group tap: Waiting for diameter to become group tap is to be in a group of tap, the old way of every tap, medium diameter and trail dimension homogeneous phase are the same as, distinction depends on cutting awl length only different. The cutting that waits for diameter to become group tap is main by advocate cutting blade burden, obstruction of the cutting when attacking whorl bits of small, platoon is successful, cutting blade wears away not easily, tap life is accordingly long, especially the treatment to big pitch whorl, this kind of advantage is more outstanding. Of tap waiting for diameter those who wear away to basically happen in whorl old way to be in advocate on cutting blade, repair so it is easier to grind. But what because wait for diameter,become group tap is medium diameter homogeneous phase, the whorl surface surface roughness that so treatment comes out is worth bigger. At the same time tap still can cause whorl dilate when attacking whorl, whorl is attacked after making awl and before attack whorl awl to already was machined gap produces between the whorl that go out, cut bits to be able to be placed in deputy cutting blade to mix so already machined whorl between, cause whorl surface scratch, the case is severe still can produce chance to extricateoneself from an awkward position in whorl surface, cause workpiece to discard as useless even, become group tap to apply to the echelon whorl with cutting precision not high demand only because of what the diameter such as this designs. (2) the consideration differs diameter echelon whorl becomes group tap: Differ diameter becomes group tap is to be in a group of tap, the old way of every tap, medium diameter and trail dimension all not identical. Differ the cutting that diameter becomes group tap is participated in at the same time by top blade and side edge, cutting resistance is very accordingly great. Arise at the same time cut bits to jam easily on face of the blade before tap, very big to the attrition force of cutting blade, accordingly cutting blade wears away easily, serious still can cause tap collapse blade or break off. But differ when diameter tap is used at tap of essence of life, because there is certain cutting amount on two side edge, the whorl surface surface roughness that so treatment gives is worth lesser, whorl quality is better. Differ diameter becomes group tap commonly used the common thread at treatment small pitch, because amount of whorl tooth sectional and lesser, treatment is small,this is, because this adds labour effect,compare ideal. But to echelon whorl, because pitch reachs whorl tooth model sectional bigger, corresponding cutting area is large also, because this meeting creates tap life very low, and all be worn away as a result of every cutting blade, long grind it is very difficult also to rise. 2.

The design that echelon whorl becomes group tap and make mix into group tap through quits diameter differ the analysis that diameter becomes group tap characteristic is knowable: Wait for diameter to machine whorl surface quality into group tap poorer, but tap life is tall; Differ diameter becomes group tap is treatment whorl surface quality is good, but tap life is low. Accordingly, can rise both advantage union, use awl of the diameter such as thick awl, essence to differ namely of diameter devise plan into group tap. The whorl tooth that considers 8-7H of × of echelon whorl Tr28 sectional bigger, because this uses 5 a group design into group tap, namely before 4 tap in diameter designs same size, those who compare tap of essence of life is medium diameter dimension slightly small, Ⅰ -- the whorl old way of Ⅳ thick tap is ordinal increase; And tap of essence of life in the tap public errand that diameter dimension design is public errand of the screw center diameter inside workpiece to carry 7H place correspondence takes H8. In the meantime, allocate every to pay the cutting negative charge of tap reasonably, be helpful for improving tap life and whorl surface quality, its cutting bear undertakes allocation with cutting area (see a picture 2) . 30% what Ⅰ thick tap assumes total cutting area, Ⅱ thick tap is assumed 28% , Ⅲ thick tap is assumed 20% , Ⅳ thick tap is assumed 15% , tap of essence of life is assumed 7% . From the graph 2 in can see, of tap of essence of life and thick tap in diameter, old way differs, the top blade of tap of essence of life and side edge all have 0.

The cutting of 1mm is measured, can avoid to wait for diameter to become the defect of group tap so, the whorl after still can be being machined to thick tap at the same time undertakes correction. Same, because thick tap is used,wait for diameter to become group tap design, make the life of tap rises greatly. The graph is shown 3 times for Ⅰ thick tap, there are 20 ′ on the diameter in cutting awl taper, because Ⅰ thick tap is in whorl bottom outlet aspirant travel attacks whorl,this is, if do not have taper, be in power of cutting of susceptive of place of the tap when attacking whorl is greater, easy cause tap to wear away faster, serious when blade of meeting generation collapse breaks off even. Graph 4, graph 5 with the graph 6 it is Ⅱ thick tap, Ⅲ thick tap and Ⅳ thick tap respectively, its are distinguished basically is dimension of whorl old way is ordinal increase, before diameter should is less than, the whorl of ministry of cutting awl end that whorl drill should attack after the attention studies old way of whorl awl whorl greatly about 0.

2mm, in order to assure hind attack whorl awl to be able to come back reliably in whorl aperture, undertake attacking whorl. The graph shows the tap that it is essence of life 7 times, as thick as Ⅰ tap is identical, there are 20 ′ on the diameter in cutting awl taper, because the way in tap of essence of life is older than the diameter in thick tap,this is, if be not done taper, criterion the tooth because of tap of essence of life attack the tooth that give chamfer than thick tap wide, it is difficult to can cause tap to come back, make tap wears away prematurely or collapse blade. 3.

The cutting amount that the use effect of tap compares common thread as a result of the whorl inside echelon and attack whorl torsion to want big severalfold, if machine tool performance is bad, the load with meeting larger generation and be out of shape, the whorl that down to treatment gives is unqualified. Accordingly, proposal manufacturer enters what travel whorl covers to attack thread machining on C630 center lathe, ＝ of cutting speed Vc 2 -- 3m/m I N. For safe for the purpose of, adjust rotate speed of lathe main shaft to lowest, namely 14r/min, of every such tap attack whorl time and exit 3min is made an appointment with when using. Should use a proof into user of group tap classics, below the premise that assures thread machining precision, improved manufacturing efficiency. CNC Milling CNC Machining