The experiment that bore machines studies
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Beyond the treatment of Css" Type=text/css Rel=stylesheet> besides difficult cutting material, a lot of people also appeal bore treatment regards research as research of the travel side the task. Grow wild county engineering course for this Japan the research group of short-term university undertook the following 4 bore machine an experiment: Twist drill of power of ① standard awl and lengthen broach are gotten cut force of torque, axial and the pattern that cut bits to compare; The test of surface roughness of the surface inside force of the torque when material of ② cutting stainless steel, axial and aperture; The test ④ that ③ gets surface roughness of the surface inside force of the torque when cutting, axial and aperture with hard alloy and high-speed steel broach uses hard metal common broach and standard twist drill get test of precision of force of the torque when cutting, axial and bore diameter dimension. Express 1 experiment feed of 18m/min of speed of cutting of 30mm70mm of deepness of treatment of S50C of material of test specimen of Ø10mm of diameter of broach of 95mm280mm of length of chamfer of helix of broach of lengthen of twist drill of power of awl of parameter of 1 cutting condition is led 0.
1, 0.
2, 0.
3mm/r0.
1mm/r experiment 1: Force of the torque of awl power twist drill and lengthen broach, axial and the cutting that the configuration that cut bits uses twist drill of standard awl power and lengthen broach to undertake getting cutting strong generation for observation quite are fought force and the appearance that cut bits, in the watch 1 shows cutting undertook getting cutting an experiment below the condition. Test result sees watch 2. Can see feed is led in 0.
1 ～ 0.
Change inside 3mm/r limits, increase as feed rate, auger cut torque and axial force to also increase gradually. In addition, when cutting begins and ending feed rate is a watch respectively 2 experiments oil of cutting of head lengthen broach does the twist drill of power of result standard awl of 1 cutting supply feed is led 0.
10.
20.
30.
1 handling time (second) 30(cuts: 30mm)20(cuts: 30mm)10(cuts: 30mm)70(cuts: Experiment of 468812446PS of value of experiment of 30mm) torque Kgf/cm is worth 0.
380.
721.
020.
38 theory are worth 0.
470.
701.
190.
Experiment of 47 axial force is worth 14023738786 theory to be worth condition of the 124221325124 eduction that cut bits to twine basic and good good and good cut bits 0.
3mm/r and 0.
2mm/r. Corresponding axial force increased respectively 40 % and 10% . From this knowable increasing torque and axial force numerical value gradually as feed rate in cutting process is fluctuant. It is when feed rate 0.
The cutting when 1mm/r begins and these two numerical value when the end are stable and changeless. Additionally the theoretical value of torque and axial force also is recorded along with all the others in the watch 2 in. By " cutting tool engineer hand friend " the numerical value that view theory value reachs according to chart namely thinks to agree basically with experimental value commonly. Compare as to lengthen broach and photograph of broach of fried dough twist of standard awl handle in 0.
Below the feed rate of 1mm/r, both torque is identical and 60% what axial force is twist drill head only, machine bear to reduce namely. This torque when explicit treatment begins and ending and axial force all did not produce change is a kind of stable treatment. Lead when feed about cutting bits appearance to be informed from the observation in experimental process for 0.
1mm/r. It is when banding cut bits; It is when feed speed 0.
2 with 0.
When 3mm/r, it is a shape to cut bits. The form cutting bits that should form when feed rate is older is better also. In getting what when cutting, pour out of to cut bits with lengthen broach, mix at the same time have banding cut bits and piece shape cuts bits. Can conclude among them piece it is better that shape cuts bits to machine condition more more. Express 3 experiments SSS10 of broach of 2 cutting condition.
0SSR10.
0GSD10.
Feed of 23m/min of speed of cutting of SUS304SUS303S45C of 0 tests data 0.
2 of experiment of 160mm/min of speed of feed of 730r/min of 22mm/r rotate speed: Of stainless steel auger cut treatment when this experiment aims to undertake to stainless steel of SUS303, SUS304 bore is machined, determine its are gotten cut torque, axial force and inside aperture surface surface roughness. Place is SSS(of appropriative of cutting stainless steel with broach short axis) , SSR(is common model) with) of GSD(standard type. Stem from relative need to return those who undertook pair of S45 steel to get cut experimental test. If cutting condition expresses 3 to show. State cutting is different respectively the exterior surface roughness that force of the axial when material, torque and orifice and hole depth make an appointment with 15mm to be in (of maximum Ry) determine result. Can see, when cutting SUS303 stainless steel, axial force and torque value are greater make clear its but cutting performance is poorer. In different broach type, with GSD(standard type) broach (high-speed steel nitrogen changes titanium coating bit) when cutting, axial force and torque value are greater show its cutting function is compared other broach of two kinds of hard alloy is differred slightly. Contrast by the exterior surface roughness inside orifice and aperture knowable with SSS(short axis) in past aperture jumps over when broach getting is cut, its surface surface roughness is better; And common model broach criterion as it happens is contrary, in jump over past aperture, its machine exterior surface roughness to jump over difference. Short axis broach is full-length 89mm, 43mm of helix chamfer length, than common model broach (full-length 105mm, 60mm) of helix chamfer length wants short, its treatment precision is so taller. Express 4 experiments high-speed steel of Ø10 of broach of 3 cutting condition, Ø10 hard alloy (steel uses EWSR10.
0, aluminium uses C-SD10.
S$%C(HV240) of material of 0) test specimen, a2017(HV80) machines deepness to make an appointment with high-speed steel of 25mm cutting speed to machine S45C:20m/min, hard alloy machines S45S:80m/min, machine A2017:2017 feed S45C:0.
05, 0.
15, 0.
25, 0.
35; A2017:0.
2, 0.
5 experiments 3: The influence of broach sort and feed speed this experiment aims to inspect the effect that gets sort of the broach in cutting treatment and feed speed to carry coarse to spend to force of torque, axial and surface. Be mixed for S45C steel by cutting material A2017 is aluminous. In getting the test that cuts S45C steel, place is high-speed steel broach and hard alloy broach with cutting tool, feed speed is installed respectively for 0.
05, 0.
15, 0.
25, 0.
35mmm/r, different feed speed is opposite observation the cutting force, influence that already machined exterior surface roughness and dimension precision. In getting the test that cuts A2017 aluminium, use aluminium machines special broach, measure a feed speed respectively for 0.
2, 0.
The data such as the cutting force when 5mm/r. If cutting condition expresses 4 to show. The measurement that shows torque and axial strength respectively result. Can see, feed rate is higher, torque and axial power are greater also. In addition OK and affirmatory orifice is in and the exterior surface roughness inside aperture does not have difference almost. With high-speed steel broach with 0.
05mm/r. feed speed is gotten when cutting, no matter be torque,be being returned is axial force numerical value lesser this is its treatment feature. Express to already machined exterior surface roughness and bore diameter dimension and the impact that feed leads respectively. Can see when feed rate is minor high-speed steel broach is mixed between hard alloy broach indiscriminate and when feed rate increases both between appeared the surface that broach of apparent difference hard alloy machines is slicker. Can see feed leads precision of bigger aperture dimension taller. In addition the dimension precision that is in when the orifice when feed rate is minor can become poor. Express 5 experiments deepness of treatment of S45C(HV240) of material of test specimen of broach of double vertex angle of hard alloy of Ø10 of broach of odd vertex angle of hard alloy of Ø10 of broach of 4 cutting condition makes an appointment with feed of 80m/min of 25mm cutting speed to lead 0.
1, 0.
2, 0.
3, 0.
4mm/r experiment 4: The influence broach of broach of broach of odd vertex angle, double vertex angle can be divided for sheet beforehand horny broach and broach of double vertex angle. Odd beforehand horny broach directs for two place when getting a heart not to stabilize bore easy and askew. And broach of double vertex angle gets a heart to stabilize pass to be close to to direct everywhere round. This experiment aims to inspect these two kinds of broach to resist force and the influence that machine precision to cutting. If cutting condition expresses 5 to show. State torque and axial force and feed lead the impact between respectively. Can see torque and feed lead direct ratio to rise and increase what torque leads as feed namely. The difference of odd vertex angle and broach of double vertex angle depends on: Be less than when feed rate 0.
When 4mm/r, the torque of broach of double vertex angle is less than sheet beforehand horny broach; Be more than when feed rate conversely 0.
4mm/r, , the torque of broach of double vertex angle is more than sheet beforehand horny broach. Rise and increase what can see axial force is led as feed, be in when feed rate 0.
1 ～ 0.
Between 4mm/r when the axial force of broach of double vertex angle is lesser, right now, odd beforehand the difference of horny broach and broach of double vertex angle is relatively apparent also. Lead the impact between for bore diameter dimension and feed. Knowable, no matter how feed rate changes, the consistency of bore diameter size that treatment of broach of double vertex angle gives is very good. Increase as feed rate instead with this, odd beforehand the bore diameter measure that horny broach treatment gives changes ceaselessly, cannot reach accordingly dimension precision. CNC Milling