The improvement of broach of straight edge spline

13mm) , to assure broach intensity, lesser tine was chosen to raise an amount when former broach is designed (SZ=0.

055mm) , but tine rises a quantity to cross Xiaoyi to create the layer that cut bits thinner, have a bit when broach wear away (namely passivation of point of a knife) when, extruding is formed possibly in workpiece broaching surface (and rather than cuts) , make of forehead tooth alveolar in without the generation that cut bits. When be close to broach of essence of life to age, the flexibility after workpiece broaching surface suffers extruding restores, make tooth ages instantaneous raising an amount increases, cutting force increases quickly also, create the appearance that make a tooth-like part of anything, make cutting tool is pulled then. Right now, face of the knife after tooth also is in serious extruding to wear away below condition, the heat in metal cutting of a large number of generation is further aggravate the destruction of cutting tool degree. The improvement of 2 broach structure by afore-mentioned analysises knowable, former broach tine raises an amount too small it is the main reason that creates broaching problem, but pure increase tine to rise a quantity to be able to make cutting force increases necessarily. Normally two kinds of methods can reduce cutting force: It is to increase pitch, decrease namely at the same time broaching tine is counted; 2 it is to reduce cutting area. Increase pitch to be able to increase broach length, make broach figure slim, not desirable, use the method that reduces cutting area commonly so. To broach, can use the cutting area that is the same as outline annulus to cut means to reduce every tooth. The form of broach tooth cut that improves a design sees a picture 2. Graph if the form of 2 broach tooth cut that improve a design pursue show 2 times, tooth uses different side to pour wine cup, be helpful for grinding already so make treatment, can eliminate cutting torque when broaching again, make sure spline tooth form machines precision. Grind in edge pouring wine cup make the part after going out, the extruding that can reduce range of the knife after side edge adds man-hour chafes, reduce cutting force thereby, reduce heat in metal cutting. After broach classics improves a design, rise tine the quantity to raise SZ=0.

11mm, can make tooth ages number decreases relatively so, broach length shortens. In addition, because the working procedure before broaching is beforehand aperture reaming treatment, treatment dimension is Ø22-0.

2mm, reason can direct broach partial dimension is increased to Ø21.

8-0.

040-0.

073mm, can make the critical section diameter of broach increases so, broach intensity rises accordingly. The 3 treatment effect courses after improving improve a design, the broaching form of broach produces change, pull the cutting state of cut of the area before edge to improve, turn into by original extruding sclerosis cut come off, improved cutting condition then. Accordingly, the circumstance allows to fall to increase tine to rise a quantity to conduce to as far as possible in cutting force raise broaching to machine quality. After tine rises a quantity to rise, it is good that tooth cuts a gender, treatment surface flexibility is out of shape small, can reduce extruding attrition resistance effectively, make heat in metal cutting drops significantly, the phenomenon that burn tine disappears. The broach after improving uses the effect good, broaching is light (via detecting, cutting force reduces 30%) , cutting tool life raises one times. The tooth after broaching each alveolar size that cut bits is even, and keep clear of easily. Because the area before tooth blade does not produce extruding, because this already machined exterior spring back the amount is small, treatment dimension is stable, treatment precision rises. CNC Milling CNC Machining