CN105606531B - The abrasive grain scratching that CBN cutter repairs ferrous metal test specimen in advance stops test method fastly - Google Patents
The abrasive grain scratching that CBN cutter repairs ferrous metal test specimen in advance stops test method fastly Download PDFInfo
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Abstract
The abrasive grain scratching for repairing ferrous metal test specimen in advance the invention discloses CBN cutter stops test method fastly, belongs to the material properties test in machining and precise and ultraprecise machining field, by fixing ferrous metal test specimen and carrying out on-line dynamic balancing；Then the test specimen is carried out to repair disk using CBN cutter, end face run-out and roughness requirements needed for reaching test；Test specimen is with specified revolving speed rotation; top is connected with the tool heads of single abrasive particle to specify cutting-in radial feed; spiral scratch is formed in test specimen end face; tool heads and test specimen moment are detached from during scratching; realize " the freezing " of abrasive grain and test specimen contact condition during single abrasive scratches; pass through measuring three-dimensional morphology and microexamination; the Related Mechanisms such as material deformation, machined surface formation, the interface friction in abrasive grain removal materials process can be better understood by, and then the further investigation for abrasive machinings process material cutting mechanisms such as grindings provides means.
Description
Technical field
The invention belongs in being machined material properties test and precise and ultraprecise machining field, and in particular to CBN
The abrasive grain scratching that cutter repairs ferrous metal test specimen in advance stops test method fastly.
Background technique
Stop test method fastly and be also quick roll setting test method, refer to makes cutter or abrasive grain speed away cutting using external force
Or grinding area keeps material for test to deform wink so that " freezing " exits the instantaneously contact condition with test specimen in cutter or abrasive grain
Between state be recorded, and do not destroyed by subsequent process.This deformation moment can pass through subsequent metallographic
Sample preparation and microexamination carry out deeper into analysis.This method can further investigate the removal of the material in cutting or grinding process
Mechanism has been developed there are many quick-stop device in metal cutting field, and corresponding test result also has in correlative theses
Report, but in grinding field, the test method of stopping fastly for single abrasive particle scratching is had not been reported.
Summary of the invention
It is an object of the invention to provide CBN cutter and repair ferrous metal test specimen in advance in place of overcome the deficiencies in the prior art
Abrasive grain scratching stop test method fastly, it is real by making the tool heads for installing abrasive grain be detached from the contact area of abrasive grain and test specimen rapidly
" freezing " of abrasive grain and test specimen contact condition can by metallographic sample preparation and corresponding microexamination during existing single abrasive scratching
The Related Mechanisms such as material deformation, machined surface formation, interface friction in materials process are removed to be better understood by abrasive grain, into
And the further investigation for abrasive machinings process material cutting mechanisms such as grindings provides means.
The technical solution adopted by the present invention to solve the technical problems is:
The abrasive grain scratching that CBN cutter repairs ferrous metal test specimen in advance stops test method fastly, comprising:
1) ferrous metal test specimen is fixed on electro spindle, test specimen can be rotated by electro spindle；The test specimen is carried out online
Dynamic balancing；
2) test specimen is carried out to repair disk using CBN single point cutter, is better than IT1 to form end face run-out amount in surface of test piece
Grade, surface average roughness Ra repair disk area better than 10nm's, the specific steps are as follows:
2-1) disk is repaired in the roughing of CBN single point cutter: vertical turning mode, to CBN single point cutter and test specimen while repairing disk
It is cooled down, the range of speeds of test specimen is 2000~10000rpm when repairing disk, and CBN single point cutter is on the outside of test specimen with 10~50 μm
Cutting-in along test specimen radial feed, feed speed range is 0.4~1.2mm/s, and feeding distance is the 1/4~1/2 of test specimen diameter；
Disk is repaired in 2-2) CBN single point cutter finishing: vertical turning mode, to CBN single point cutter and test specimen while repairing disk
It is cooled down, the range of speeds of test specimen is 2000~10000rpm when repairing disk, and CBN single point cutter is on the outside of test specimen with 2~10 μm
Cutting-in along test specimen radial feed, feed speed range is 0.1~0.3mm/s, and feeding distance is the 1/4~1/2 of test specimen diameter；
3) CBN single point cutter touches tool setting gauge, and determination repairs disk area and tool setting gauge to the difference in height h of knife plane0；By CBN
Single point cutter is changed to the tool heads that top is connected with single abrasive particle, and the abrasive grain on tool heads top touches tool setting gauge, then by tool
Head moves up h along the axial direction of test specimen rotation0+ δ, so that the abrasive grain on tool heads top is located at test specimen and repairs above disk area at δ, it is complete
Pairs of knife；
4) tool heads are moved to and is repaired right above the scratching point of disk area, and move down δ+apSo that scratching depth is ap；According to need
Scratching radius R where scratching speed v and the scratching point of test, passes throughThe setting speed of calculation testing piece
n；Test specimen is rotated according to setting speed n, and tool heads are radially fed, so that abrasive grain to form spiral shape and draw repairing disk area and scratch
Trace, tool heads moment and test specimen are detached from during scratching, and the instantaneous linear velocity for being detached from moment tool heads top is higher than test specimen rotation
Linear velocity is detached from the contact condition of moment abrasive grain and test specimen with " freezing "；Measurement system during this by being connected with tool heads
Data during system acquisition scratching；Tool heads and test specimen are cooled down while scratching.
In one embodiment: the abrasive grain is diamond, CBN, oxide ceramics or nitride ceramics, and abrasive grain shape is ball
Shape, cone or polygonal pyramid shape；The abrasive grain is fixed in tool heads top by mechanical grip, plating or soldering；The tool heads
For pressure head.
In one embodiment: the test specimen is disc；End face radius smaller portions linear velocity is smaller when due to test, cannot
Realize higher scratching speed, in order to improve efficiency, spherical mounted point feeding distance is less than test specimen radius when repairing disk, so that described repair
Disk area is circular ring shape.
In one embodiment: the measuring system is dynamometry and acoustic emission system, dynamometer, sound including the connection of mutual signal
Emission system, data collecting card and signal amplifier；The tool heads are connected with dynamometer and acoustic emission system.
In one embodiment: the intrinsic frequency of the dynamometer is higher than 4KHz, and dynamometry precision is better than 0.01N；The data are adopted
The sample rate of truck is higher than 2M/s.
In one embodiment: in the step 2), the disk area of repairing is circular ring shape.
In one embodiment: the tool heads are superior in the positioning accuracy of the axial direction and radial direction that rotate along test specimen
0.1μm。
In one embodiment: the positioning accuracy of the tool setting gauge is better than 0.1 μm.
In one embodiment: in the step 4), tool heads are detached from by high rigidity spring or pneumatic impact wrench moment and test specimen.
In one embodiment: the tool heads axis is parallel to test specimen rotation axis.
In addition to being described, the connection type between the single treatment process and each device of each device according to the present invention is equal
For this field routine techniques, it is not described in detail herein.
The technical program compared with the background art, it has the following advantages:
1. single abrasive particle scratching of the invention stops test method fastly, during scratching, keep the tool heads for installing abrasive grain fast
Speed is detached from the contact area of abrasive grain and test specimen, realizes and is detached from moment abrasive grain and test specimen contact condition during single abrasive scratching
" freezing " can be better understood by material deformation in abrasive grain removal materials process, machined surface shape by microexamination
At Related Mechanisms such as, interface frictions, and then the further investigation for abrasive machinings process material cutting mechanisms such as grindings provides means.
2. the present invention carries out on-line dynamic balancing to main shaft-sample system, the substantially end face in high-speed rotation is avoided
Bounce or circular runout, to keep the steady contact state between abrasive grain and test specimen；Meanwhile utilizing CBN lathe tool Ultra-precision Turning
Technology carries out on-line machining to test specimen, while improving the form accuracy and surface smoothness of test specimen, improves test specimen revolution essence
Degree and grain motion precision cooperate dynamic balancing, further ensure to ensure that the relative motion precision between abrasive grain and test specimen
It above can continually and steadily be contacted between abrasive grain and test specimen in longer scratching distance, to realize that the high-speed, high precision scratching of abrasive grain is surveyed
Examination, and then guarantee the accuracy for stopping test fastly.
3. the machined surface quality of test specimen must be better than the surface that correlation grinding process obtain according to the common sense of this field
Quality is preferably higher by an order of magnitude, and obtained scratch test result could be used for the analysis of grinding process cutting mechanisms；Due to
The present invention greatly improves the quality of surface of test piece, therefore can satisfy wanting for the high accuracy analysis such as grinding process cutting mechanisms
It asks, can be used for the research of Material Removal Mechanism in process of friction and wear and grinding.
4. abrasive grain scratching depth is greater than 5 times or more of the surface of test piece fluctuating quantity stability that just can guarantee scratching, due to
The present invention greatly improves the quality of surface of test piece, and surface of test piece precision and finish are good, even the abrasive grain of small grain size also can
It realizes that stablizing high-precision scratches, therefore can be used for the single abrasive particle scratching test of small grain size abrasive grain, further expanded this hair
Bright application range, and industry single abrasive particle scratching experimental technique is greatly facilitated.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is test method schematic illustration of the invention.
Fig. 2 repairs disk Principle of Process schematic diagram for of the invention.
Fig. 3 stops schematic illustration for of the invention fastly, and it is also " freezing " that wherein Fig. 3 b, which is enlarged diagram at A in Fig. 3 a,
Abrasive grain and test specimen are detached from moment schematic diagram.
Fig. 4 is the comparison of surface of test piece three-dimensional appearance before and after repairing disk in the embodiment of the present invention 1, and wherein Fig. 4 a is before repairing disk
(processing through conventional smart car technique), Fig. 4 b are after repairing disk.
Fig. 5 is the comparison of surface of test piece end face run-out amount before and after repairing disk in the embodiment of the present invention 1, and wherein Fig. 5 a is before repairing disk
(processing through conventional smart car technique), end face run-out amount maximum value is up to 17.9 μm；Fig. 5 b is after repairing disk, and end face run-out amount is most
Big value is 2.8 μm.
Fig. 6 is the SEM photograph and three-dimensional appearance schematic diagram of scratch in the embodiment of the present invention 1.
Fig. 7 is that abrasive grain and test specimen are detached from the three-dimensional that moment, that is, scratch front end is " frozen " region in the embodiment of the present invention 1
Pattern schematic diagram.
Fig. 8 is that abrasive grain and test specimen are detached from the two dimension that moment, that is, scratch front end is " frozen " region in the embodiment of the present invention 1
Cross Section Morphology schematic diagram.
Fig. 9 is in comparative example of the present invention to repair disk area and do not repair the single abrasive particle of disk area continuously to scratch and stop test result fastly
Schematic diagram.
Appended drawing reference: test specimen 1, tool heads 2 repair disk area 3, tool setting gauge 4, CBN lathe tool 5.
Specific embodiment
The contents of the present invention are illustrated below by embodiment:
Embodiment 1
A kind of single abrasive particle that CBN (cubic boron nitride) cutter repairs ferrous metal test specimen in advance continuously scratches test method, institute
The device of use includes:
Lathe, disc ferrous metal test specimen 1 is installed on the electro spindle of lathe, and test specimen 1 can be rotated by electro spindle；
Dynamic balance instrument, for carrying out on-line dynamic balancing to test specimen 1；
CBN single point cutter is CBN single-point lathe tool 5, for carrying out repairing disk to 1 end face of test specimen；The CBN single-point lathe tool 5 can fill
It is installed in bracket with tearing open, and lathe is movably installed in by bracket；
Tool heads 2, for carrying out scratching test；2 top of tool heads is connected with single abrasive grain；The tool heads 2 can be with
CBN single point cutter is installed in bracket with mutually replacing assembly and disassembly, and is movably installed in lathe by bracket；Tool heads 2 and Gao Gang
It spends spring or pneumatic impact wrench is connected, be detached from by the moment of high rigidity spring or pneumatic impact wrench implementation tool head 2 and test specimen 1；Work
Tool 2 axis of head is parallel to 1 rotation axis of test specimen, and the axial direction and radial direction that tool heads 2 can be rotated in test specimen 1 move up
It is dynamic, and 0.1 μm is superior in the positioning accuracy of both direction；
Tool setting gauge 4, for carrying out CBN single point cutter and tool heads 2 to knife, positioning accuracy is better than 0.1 μm；It is installed in machine
Bed, and the relative position between test specimen 1 is kept fixed；
Measuring system is dynamometry and acoustic emission system, dynamometer, acoustic emission system, data including the connection of mutual signal
Capture card and signal amplifier；The tool heads 2 are connected with dynamometer and acoustic emission system；The connection of data collecting card signal calculates
Machine；
Air-cooler: for the tool heads and examination during the CBN single point cutter and test specimen repaired during disk, and scratching
Cooling is blowed in part.
The specific test method is as follows:
1) the 45 steel disc test specimens 1 of diameter 400mm, thickness 20mm are fixed with modes such as magnetic suction disc or mechanical clamps
On the electro spindle of lathe, test specimen 1 can be rotated by electro spindle；On-line dynamic balancing is carried out to the test specimen 1 with dynamic balance instrument, to subtract
The few vibration of test specimen 1 when rotating at high speed, to guarantee that abrasive grain and test specimen 1 can be contacted steadily during scratching；
2) test specimen 1 is carried out repairing disk using CBN single-point lathe tool 5, roughing is first carried out, then finished, to try
1 surface of part forms 5.1 μm of end face run-out amount, and the circular ring shape of surface average roughness Ra 4.57nm repairs disk area 3, to reduce examination
1 end face run-out amount of part improves surface quality, is further ensured that during scratching that abrasive grain and test specimen 1 can be contacted steadily, specifically
Steps are as follows:
Disk is repaired in 2-1) CBN single-point lathe tool roughing: vertical turning mode opens air-cooler while repairing disk, makes cold wind pair
Quasi- CBN single-point lathe tool 5 and test specimen 1 are cooled down, and the revolving speed of test specimen 1 is 3000rpm when repairing disk, and CBN single-point lathe tool 5 is from test specimen 1
With 10 μm of cutting-in along test specimen radial feed, feed speed range is 0.4~1.2mm/s, feeding distance 100mm in outside；
Disk is repaired in 2-2) CBN single-point lathe tool finishing: vertical turning mode opens air-cooler while repairing disk, makes cold wind pair
Quasi- CBN single-point lathe tool 5 and test specimen 1 are cooled down, and the revolving speed of test specimen 1 is 3000rpm when repairing disk, and CBN single-point lathe tool 5 is from test specimen 1
With 2 μm of cutting-in along test specimen radial feed, feed speed range is 0.1~0.3mm/s, feeding distance 100mm in outside；
It can be repeated several times when necessary and repair disk so that test specimen end face reaches above-mentioned surface quality.
Fig. 4 and Fig. 5 are shown in the comparison for repairing disk front and back 1 three-dimensional surface shape of test specimen and end face run-out amount respectively；
3) CBN single-point lathe tool 5 touches tool setting gauge 4, determines and repairs disk area 3 and tool setting gauge 4 to the difference in height h of knife plane0；It will
CBN single-point lathe tool 5 is removed from bracket, and being changed to top soldering has the tool heads 2 of spherical wear particles of single radius 0.04mm, work
Tool 2 top of head moves closer to tool setting gauge 4, and when measuring system data generate mutation, the abrasive grain on 2 top of representational tool head is just touched
Tool setting gauge 4 is touched to knife plane, then tool heads 2 are moved up into h along the axial direction that test specimen rotates0+ δ, so that the mill on 2 top of tool heads
Grain is located at test specimen 1 and repairs at 3 top δ of disk area, completes to knife, to can accurately control scratching depth when guaranteeing follow-up test；
4) 2 level of tool heads is moved to and is repaired right above the scratching point of disk area 3, and move down δ+apSo that scratching depth is ap；
According to the scratching radius R where scratching speed v and the scratching point that need to be tested, pass throughCalculation testing piece 1 is set
Determine revolving speed n；Among the present embodiment, n=10000rpm, scratching speed v are 157m/s (the corresponding position R=150mm)~209m/s
(the corresponding position R=200mm), scratches depth apIt is respectively set as 6 μm；Air-cooler is opened, cold wind alignment tools head and test specimen are made
It is cooled down, test specimen 1 is rotated according to above-mentioned setting speed n, and tool heads 2 are radially fed with the speed of 2m/s, so that abrasive grain
The continuous helical shape scratch that spacing is 200 μm is formed repairing disk area 3, scratch circle number is greater than 3；During scratching by with work
Have the data during the connected dynamometer of head 2 and acoustic emission system acquisition scratching, and data are transmitted to by signal amplifier
Capture card, then be transmitted to computer and calculated, the physical quantitys such as scratching power, acoustic emission signal can be obtained；During scratching, work as work
When the single abrasive particle on tool 2 top of head scratches to the circumference that diameter is 150mm (scratching speed is 157m/s), tool heads 2 pass through
High rigidity spring or pneumatic impact wrench moment and test specimen 1 are detached from, and the instantaneous linear velocity for being detached from 2 top of moment tool heads is higher than test specimen
1 rotation linear velocity, to be detached from the contact condition of moment abrasive grain and test specimen 1 during " freezing " abrasive grain scratching；
It should be noted that commonly used in the art make tool heads be detached from test specimen by high rigidity spring or pneumatic impact wrench
In mode, tool heads are fixed on high rigidity spring or pneumatic impact wrench, in the drive of high rigidity spring or pneumatic impact wrench when disengaging
It is lower to be detached from along circular arc, therefore the instantaneous linear velocity on above-mentioned disengaging moment tool heads top refers to being detached from moment tool heads along circular arc
The tangential velocity of movement, the direction of motion at this time are parallel to test specimen rotation axis and far from test specimens.
5) microexamination and measuring three-dimensional morphology are carried out to scratch, as shown in Figure 6；Scratch front end is " frozen " region
Three-dimensional appearance and its two-dimensional section pattern are as shown in Figure 7 and Figure 8.
As needed, the deformed region that single abrasive particle front is " frozen " can also be sampled, inlay, polish, throw
Light and corrosion are made metallographic specimen and carry out microexamination to metallographic specimen.
Among the present embodiment, the intrinsic frequency of the dynamometer is higher than 4KHz, and dynamometry precision is better than 0.01N；The data
The sample rate of capture card is higher than 2M/s.
Embodiment 2
The present embodiment and the institute of embodiment 1 the difference is that, the tool heads top soldering has single radius 0.08mm's
Spherical abrasive grain, remaining is the same as embodiment 1.
As needed, the abrasive grain can be diamond, CBN, oxide ceramics or nitride ceramics；Abrasive grain shape may be used also
Think cone or polygonal pyramid shape；The abrasive grain is fixed in tool heads top by mechanical grip, plating or soldering；The tool heads
It can be pressure head or other fixed grain forms.
As needed, the parameter for repairing disk adjust in the following range and carry out it is one or many repair disk, can be in surface of test piece
It forms end face run-out amount and is better than IT1 grades, surface average roughness Ra repairs disk area better than 10nm's:
2-1) disk is repaired in the roughing of CBN single point cutter: vertical turning mode, to CBN single point cutter and test specimen while repairing disk
It is cooled down, the range of speeds of test specimen is 2000~10000rpm when repairing disk, and CBN single point cutter is on the outside of test specimen with 10~50 μm
Cutting-in along test specimen radial feed, feed speed range is 0.4~1.2mm/s, and feeding distance is the 1/4~1/2 of test specimen diameter；
Disk is repaired in 2-2) CBN single point cutter finishing: vertical turning mode, to CBN single point cutter and test specimen while repairing disk
It is cooled down, the range of speeds of test specimen is 2000~10000rpm when repairing disk, and CBN single point cutter is on the outside of test specimen with 2~10 μm
Cutting-in along test specimen radial feed, feed speed range is 0.1~0.3mm/s, and feeding distance is the 1/4~1/2 of test specimen diameter.
Comparative example
Ferrous metal test specimen is taken, after the processing of conventional smart car technique, surface of test piece is divided into two regions, one of area
Domain disk step according to the invention of repairing carries out repairing disk, so that its surface quality is reached end face run-out amount better than IT1 grades, surface is average thick
Rugosity Ra is better than 10nm, is denoted as and repairs disk area；Another region is denoted as without repairing disk and does not repair disk area.
Above-mentioned test specimen is continuously scratched using test method progress single abrasive particle of the invention and stops to test fastly, in same test
Scratch is formed in disk area repairing disk area and do not repair under parameter, scratch depth very little can reach micron order, and comparing result is such as
Shown in Fig. 9, it can be seen that in the case where scratch depth very little, the scratch for repairing disk area forms coherent spiral shape, in uniform
Be spaced apart, detect its depth direction error less than 1 μm/1mm, show abrasive grain and test specimen repair the longer scratching in disk area away from
It can continually and steadily be contacted from upper, so as to realize that the high-speed, high precision scratching of abrasive grain stops to test fastly；And disk area is not repaired
Scratch cannot form coherent spiral shape, and scratch interval is different, and the scratch depth, scratch width all have macroscopic otherness,
Show continually and steadily contact between abrasive grain and test specimen, it is even more impossible to the high-speed, high precision scratchings for abrasive grain to stop to test fastly.
The above is only the preferred embodiment of the present invention, the range implemented of the present invention that therefore, it cannot be limited according to, i.e., according to
Equivalent changes and modifications made by the invention patent range and description, should still be within the scope of the present invention.
Claims (9)
- The abrasive grain scratching that 1.CBN cutter repairs ferrous metal test specimen in advance stops test method fastly, it is characterised in that: includes:1) ferrous metal test specimen is fixed on electro spindle, test specimen can be rotated by electro spindle；The test specimen is carried out online dynamic flat Weighing apparatus；2) test specimen is carried out to repair disk using CBN single point cutter, is better than IT1 grades to form end face run-out amount in surface of test piece, table Face average roughness Ra repairs disk area better than 10nm's, the specific steps are as follows:2-1) disk is repaired in the roughing of CBN single point cutter: vertical turning mode, is carried out while repairing disk to CBN single point cutter and test specimen Cooling, the range of speeds of test specimen is 2000~10000rpm when repairing disk, and CBN single point cutter is cut on the outside of test specimen with 10~50 μm Deep along test specimen radial feed, feed speed range is 0.4~1.2mm/s, and feeding distance is the 1/4~1/2 of test specimen diameter；Disk is repaired in 2-2) CBN single point cutter finishing: vertical turning mode carries out CBN single point cutter and test specimen while repairing disk Cooling, the range of speeds of test specimen is 2000~10000rpm when repairing disk, and CBN single point cutter is cut on the outside of test specimen with 2~10 μm Deep along test specimen radial feed, feed speed range is 0.1~0.3mm/s, and feeding distance is the 1/4~1/2 of test specimen diameter；3) CBN single point cutter touches tool setting gauge, and the positioning accuracy of the tool setting gauge is better than 0.1 μm；It determines and repairs disk area and to knife Difference in height h of the instrument to knife plane0；CBN single point cutter is changed to the tool heads that top is connected with single abrasive particle, tool heads top Abrasive grain touch tool setting gauge, then tool heads are moved up into h along the axial direction that test specimen rotates0+ δ, so that the abrasive grain on tool heads top It repairs above disk area at δ, is completed to knife positioned at test specimen；4) tool heads are moved to and is repaired right above the scratching point of disk area, and move down δ+apSo that scratching depth is ap；According to needing to test Scratching speed v and scratching point where a scratching radius R, pass throughThe setting speed n of calculation testing piece；Examination Part is rotated according to setting speed n, and tool heads are radially fed, so that abrasive grain scratches to form spiral scratch repairing disk area, Tool heads moment and test specimen are detached from during scratching, and the instantaneous linear velocity for being detached from moment tool heads top is higher than test specimen and rotates linear speed Degree is detached from the contact condition of moment abrasive grain and test specimen with " freezing "；It is adopted during this by the measuring system being connected with tool heads Data during collection scratching；Tool heads and test specimen are cooled down while scratching.
- 2. the abrasive grain scratching that CBN cutter according to claim 1 repairs ferrous metal test specimen in advance stops test method, feature fastly Be: the abrasive grain is diamond, CBN, oxide ceramics or nitride ceramics, and abrasive grain shape is spherical, cone or more ribs Taper；The abrasive grain is fixed in tool heads top by mechanical grip, plating or soldering；The tool heads are pressure head.
- 3. the abrasive grain scratching that CBN cutter according to claim 1 repairs ferrous metal test specimen in advance stops test method, feature fastly Be: the test specimen is disc；Spherical mounted point feeding distance is less than test specimen radius when repairing disk, and repairing disk area is circular ring shape.
- 4. the abrasive grain scratching that CBN cutter according to claim 1 repairs ferrous metal test specimen in advance stops test method, feature fastly Be: the measuring system is dynamometry and acoustic emission system, dynamometer, acoustic emission system, data including the connection of mutual signal Capture card and signal amplifier；The tool heads are connected with dynamometer and acoustic emission system.
- 5. the abrasive grain scratching that CBN cutter according to claim 4 repairs ferrous metal test specimen in advance stops test method, feature fastly Be: the intrinsic frequency of the dynamometer is higher than 4KHz, and dynamometry precision is better than 0.01N；The sample rate of the data collecting card Higher than 2M/s.
- 6. the abrasive grain scratching that CBN cutter according to claim 3 repairs ferrous metal test specimen in advance stops test method, feature fastly Be: in the step 2), the disk area of repairing is circular ring shape.
- 7. the abrasive grain scratching that CBN cutter according to claim 1 repairs ferrous metal test specimen in advance stops test method, feature fastly Be: the tool heads are superior to 0.1 μm in the positioning accuracy of the axial direction and radial direction that rotate along test specimen.
- 8. the abrasive grain scratching that CBN cutter according to claim 1 repairs ferrous metal test specimen in advance stops test method, feature fastly Be: in the step 4), tool heads are detached from by high rigidity spring or pneumatic impact wrench moment and test specimen.
- 9. the abrasive grain scratching that CBN cutter according to claim 1 repairs ferrous metal test specimen in advance stops test method, feature fastly Be: the tool heads axis is parallel to test specimen rotation axis.
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