CN105717031A - Single abrasive particle continuous scratching test method for CBN tool pre-maintenance ferrous metal test piece - Google Patents
Single abrasive particle continuous scratching test method for CBN tool pre-maintenance ferrous metal test piece Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 161
- 238000006748 scratching Methods 0.000 title claims abstract description 80
- 230000002393 scratching effect Effects 0.000 title claims abstract description 80
- 239000002245 particle Substances 0.000 title claims abstract description 73
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 239000002184 metal Substances 0.000 title claims abstract description 22
- 238000010998 test method Methods 0.000 title claims abstract description 21
- 238000012423 maintenance Methods 0.000 title abstract 2
- 238000000034 method Methods 0.000 claims abstract description 38
- 230000008569 process Effects 0.000 claims abstract description 27
- 230000008439 repair process Effects 0.000 claims description 17
- 238000005259 measurement Methods 0.000 claims description 5
- 238000005476 soldering Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- 150000004767 nitrides Chemical class 0.000 claims description 3
- 239000011224 oxide ceramic Substances 0.000 claims description 3
- 229910052574 oxide ceramic Inorganic materials 0.000 claims description 3
- 238000007747 plating Methods 0.000 claims description 3
- 238000003754 machining Methods 0.000 abstract description 10
- 239000000463 material Substances 0.000 abstract description 10
- 230000007246 mechanism Effects 0.000 abstract description 5
- 238000005299 abrasion Methods 0.000 abstract 2
- 238000004458 analytical method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- -1 CBN Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/10—Investigating individual particles
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Abstract
The invention discloses a single abrasive particle continuous scratching test method for a CBN tool pre-maintenance ferrous metal test piece, and belongs to the field of material performance testing in machining and precision and ultra-precision machining.The ferrous metal test piece is fixed to an electric main shaft, and online dynamic balance is conducted on the test piece; a CBN tool is used for conducting plate repairing on the test piece to meet the requirements for end face run-out and roughness needed for testing; a tool head with the top end fixedly connected with a single abrasive particle is replaced, and tool setting is conducted in the replacing process; finally, scratching testing is conducted, the test piece rotates at an appointed rotating speed, the tool head undercuts to the appointed cutting depth and conducts radial feeding, spiral scratches are formed on the end face of the test piece, and scratching force, acoustic emission signals and physical quantity are acquired by a measuring system in the process.By means of the method, it can be guaranteed that the abrasive particle and the test piece make stable contact on a long scratching distance, high-speed and high-precision scratching is achieved, and related test results can be used in studies of material removal mechanism in the frictional abrasion process and abrasion machining.
Description
Technical field
The invention belongs to the material properties test in machining and precise and ultraprecise machining field, be specifically related to a kind of CBN cutter and repair the continuous scratching method of testing of single abrasive particle of ferrous metal test specimen in advance.
Background technology
Abrasive machining process can regard as abrasive surface arrange in a large number uneven, be distributed the working angles that irregular different abrasive particle completes jointly.In scientific research, often complicated phenomenon is abstracted into the pattern of a kind of simplification, inquires into some the most essential problems.The shear action of tiny abrasive particle is the basis of grinding, and the scratching of single abrasive particle, cultivated plough, cutting, as the basic model of grinding, become a kind of important means of the complicated ablation of understanding.
The scratching of single abrasive particle, plough plough, the means of testing of cutting behavior mainly has four kinds of forms: straight line scratching, wedge surface scratching, ball dish scratching and single pendulum scratching.Existing lot of documents and publication analysis are found, four kinds of method of testings exist corresponding not enough: the scratching underspeed (maximum linear velocity is 4m/s only) of straight line scratching and the test of wedge surface scratching, it is difficult to well simulation abrasive machining process (maximum linear velocity is up to 200m/s)；Ball dish scratching method of testing is actually a kind of typical tribology tester method, material removing method in ball dish friction process has a great difference with the material removing method in abrasive machining process, when reaching stable friction phase, remove even without material, simultaneously that the form accuracy of frictional disk and surface smoothness requirements is very high；The test of single pendulum scratching is considered as a kind of means of testing removing materials process closest to abrasive particle, but measuring stability is poor, and due to too short abrasive particle-absorption surface time, the collection of the material removal process physical quantitys such as cutting force becomes a difficult problem.
Patent disclosed in some proposes the improved method of single abrasive test, single pendulum scratching method of testing is improved, change traditional workpiece static, abrasive particle rotating manner is that abrasive particle is static, workpiece rotating manner, thus obtaining longer cut, therefore the longer time is had to gather the physical quantitys such as cutting force, but do not retrieve the relevant paper of these patents and product, be primarily due to these patented methods be embodied as there is problems in that due to cut length increase, abrasive particle and workpiece relative motion required precision are increased substantially, and said method all cannot keep being in all the time between abrasive particle and workpiece high-precision contact condition of stablizing, therefore, it is difficult to realize stablizing scratching, more cannot realize the high-speed, high precision scratching test of small grain size abrasive particle.The problems referred to above greatly constrain the progress of single abrasive particle scratching experimental technique.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art part; provide a kind of CBN cutter and repair the continuous scratching method of testing of single abrasive particle of ferrous metal test specimen in advance; ensure that and wipe the stable contact in distance at relatively dash between abrasive particle and test specimen; achieve the high-speed, high precision scratching of small grain size abrasive particle; such that it is able to physical quantitys such as the cutting force gathered stably, accurately in single abrasive particle scratching process, chip deformations, dependence test result can be used for the research of Material Removal Mechanism in process of friction and wear and grinding.
The technical solution adopted for the present invention to solve the technical problems is:
The continuous scratching method of testing of single abrasive particle of ferrous metal test specimen repaiied in advance by a kind of CBN cutter, including:
1) being fixed on electro spindle by ferrous metal test specimen, test specimen can be rotated by electro spindle；This test specimen is carried out on-line dynamic balancing；
2) adopting CBN single point cutter that this test specimen is repaiied dish, be better than IT1 level forming end face run-out amount in surface of test piece, what surface average roughness Ra was better than 10nm repaiies disk area, specifically comprises the following steps that
2-1) dish is repaiied in the roughing of CBN single point cutter: vertical turning pattern, while repairing dish, CBN single point cutter and test specimen are cooled down, repairing the range of speeds of test specimen during dish is 2000～10000rpm, CBN single point cutter outside test specimen with the cutting-in of 10～50 μm along test specimen radial feed, feed speed ranges for 0.4～1.2mm/s, and feeding distance is the 1/4～1/2 of test specimen diameter；
2-2) dish is repaiied in the polish of CBN single point cutter: vertical turning pattern, while repairing dish, CBN single point cutter and test specimen are cooled down, repairing the range of speeds of test specimen during dish is 2000～10000rpm, CBN single point cutter outside test specimen with the cutting-in of 2～10 μm along test specimen radial feed, feed speed ranges for 0.1～0.3mm/s, and feeding distance is the 1/4～1/2 of test specimen diameter；
3) CBN single point cutter touching tool setting gauge, it is determined that repair disk area and the tool setting gauge difference in height h to cutter plane0；CBN single point cutter is replaced by top and is connected with the tool heads of single abrasive particle, the abrasive particle on tool heads top touching tool setting gauge, then shifting h on the axial direction that tool heads is rotated along test specimen0+ δ, so that the abrasive particle on tool heads top is positioned at test specimen and repaiies δ place above disk area, completes cutter；
4) tool heads is moved to directly over the scratching point repairing disk area, and move down δ+apSo that the scratching degree of depth is ap；Scratching radius R according to the scratching speed v that need to test and scratching point place, passes throughThe setting speed n of calculation testing piece；Test specimen rotates according to setting speed n, and tool heads radially feeding, so that abrasive particle forms spiral scratch repairing disk area scratching, by the data in the measurement system acquisition scratching process that is connected with tool heads in this process；While scratching, tool heads and test specimen are cooled down.
In one embodiment: described abrasive particle is diamond, CBN, oxide ceramics or nitride ceramics, abrasive particle is shaped as spherical, conical or polygonal pyramid shape；This abrasive particle is fixed in tool heads top by mechanical grip, plating or soldering；Described tool heads is pressure head.
In one embodiment: described test specimen is disc.
In one embodiment: described measurement system is dynamometry and acoustic emission system, including dynamometer, acoustic emission system, data collecting card and signal amplifier that mutual signal connects；Described tool heads is connected with dynamometer and acoustic emission system.
In one embodiment: the natural frequency of described dynamometer is higher than 4KHz, and dynamometry precision is better than 0.01N；The sample rate of described data collecting card is higher than 2M/s.
In one embodiment: described step 2) in, repair during dish the feeding distance of CBN cutter less than test specimen radius, described in repair disk area be annular.
In one embodiment: described tool heads is superior to 0.1 μm in the positioning precision of the axial direction rotated along test specimen and radial direction.
In one embodiment: the positioning precision of described tool setting gauge is better than 0.1 μm.
In one embodiment: described cut is continuous helical shape cut, and the cut number of turns is more than 3.
In one embodiment: described tool heads axis is parallel to test specimen rotation axis.
Except having explanation, the connected mode between the single processing procedure of each device involved in the present invention and each device is this area routine techniques, is not described in detail at this.
The technical program is compared with background technology, and it has the advantage that
1. main shaft-sample system is carried out on-line dynamic balancing by the present invention, it is to avoid significantly end face run-out in high-speed rotation or circular runout, thus keep the stable contact condition between abrasive particle and test specimen；Simultaneously, utilize CBN lathe tool Ultraprecision Machining that test specimen is carried out on-line machining, improve form accuracy and the surface smoothness of test specimen simultaneously, improve test specimen rotating accuracy and grain motion precision, thus the relative motion precision that ensure that between abrasive particle and test specimen, coordinate dynamic balancing, further ensure and can contact continually and steadily in relatively dash wiping distance between abrasive particle and test specimen, thus realizing the high-speed, high precision scratching test of abrasive particle.
2., according to the general knowledge of this area, the machined surface quality of test specimen must be better than the surface quality that relevant grinding process obtains, it is desirable to exceeding an order of magnitude, the cut test result obtained could be used for the analysis of grinding process cutting mechanisms；Owing to the present invention is greatly improved the quality of surface of test piece, therefore, it is possible to meet the requirement of the high accuracy analysis such as grinding process cutting mechanisms, can be used for the research of Material Removal Mechanism in process of friction and wear and grinding.
3. the abrasive particle scratching degree of depth is more than the stability of more than 5 times guarantee scratchings of surface of test piece fluctuating quantity; owing to the present invention is greatly improved the quality of surface of test piece; surface of test piece precision and fineness are good; even the abrasive particle of small grain size also can realize stable high accuracy scratching; therefore may be used for single abrasive particle scratching test of small grain size abrasive particle; expand the range of application of the present invention further, be also being greatly facilitated single abrasive particle scratching experimental technique of the industry.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is the method for testing principle schematic of the present invention.
Fig. 2 be the present invention repair dish Principle of Process schematic diagram.
Fig. 3 repaiies the contrast of surface of test piece three-dimensional appearance before and after dish in the embodiment of the present invention 1, wherein Fig. 3 a for before repairing dish (through conventional finish turning processes), Fig. 3 b is for after repairing dish.
Fig. 4 repaiies the contrast of surface of test piece end face run-out amount before and after dish in the embodiment of the present invention 1, wherein Fig. 4 a for before repairing dish (through conventional finish turning processes), its end face run-out amount maximum is up to 17.9 μm；Fig. 4 b is for after repairing dish, and its end face run-out amount maximum is 2.8 μm.
Fig. 5 is three-dimensional appearance and the cross sectional shape figure (the scratching degree of depth 20 μm) thereof of cut in the embodiment of the present invention 1, and wherein Fig. 5 a is the three-dimensional appearance schematic diagram of cut, and Fig. 5 b is the cross sectional shape figure of cut.
Fig. 6 repaiies disk area and does not repair the continuous scratching test result schematic diagram of single abrasive particle of disk area in comparative example of the present invention.
Accompanying drawing labelling: test specimen 1, tool heads 2, repair disk area 3, tool setting gauge 4, CBN lathe tool 5.
Detailed description of the invention
Illustrate present disclosure by the examples below:
Embodiment 1
The continuous scratching method of testing of single abrasive particle of ferrous metal test specimen repaiied in advance by a kind of CBN (cubic boron nitride) cutter, and the device adopted 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, for CBN single-point lathe tool 5, for test specimen 1 end face is repaiied dish；This CBN single-point lathe tool 5 is installed in support dismantledly, and is installed in lathe movably by support；
Tool heads 2, is used for carrying out scratching test；This tool heads 2 top is connected with the abrasive particle of single；This tool heads 2 can be installed in support with CBN single point cutter with replacing mounting or dismounting mutually, and is installed in lathe movably by support；Tool heads 2 axis is parallel to test specimen 1 rotation axis, and tool heads 2 at the axial direction that test specimen 1 rotates with move in the radial direction, and can be superior to 0.1 μm in the positioning precision of both direction；
Tool setting gauge 4, for carrying out cutter to CBN single point cutter and tool heads 2, positioning precision is better than 0.1 μm；Be installed in lathe, and and relative position between test specimen 1 keep fixing；
Measurement system, for dynamometry and acoustic emission system, including dynamometer, acoustic emission system, data collecting card and signal amplifier that mutual signal connects；This tool heads 2 is connected with dynamometer and acoustic emission system；Data acquisition card signal connects computer；
Air-cooler: be used for the CBN single point cutter repaiied in dish process and test specimen, and tool heads and the test specimen in scratching process blows cooling.
Concrete method of testing is as follows:
1) being fixed on the electro spindle of lathe by the 45 steel disc test specimens 1 of diameter 400mm, thickness 20mm by the mode such as magnetic suction disc or mechanical clamp, test specimen 1 can be rotated by electro spindle；With dynamic balance instrument, this test specimen 1 is carried out on-line dynamic balancing, to reduce the test specimen 1 vibration when high speed rotating, thus ensureing that in scratching process, abrasive particle can stably contact with test specimen 1；
2) adopt CBN single-point lathe tool 5 that this test specimen 1 is repaiied dish, first carry out roughing, carry out polish again, to form end face run-out amount 5.1 μm on test specimen 1 surface, the annular of surface average roughness Ra 4.57nm repaiies disk area 3, to reduce test specimen 1 end face run-out amount, improves surface quality, being further ensured that in scratching process, abrasive particle can stably contact with test specimen 1, specifically comprises the following steps that
2-1) dish is repaiied in the roughing of CBN single-point lathe tool: vertical turning pattern, repair open cold blower fan while dish, cold wind alignment CBN single-point lathe tool 5 and test specimen 1 is made to cool down, repairing the rotating speed of test specimen 1 during dish is 3000rpm, CBN single-point lathe tool 5 outside test specimen 1 with the cutting-in of 10 μm along test specimen radial feed, feed speed ranges for 0.4～1.2mm/s, and feeding distance is 100mm；
2-2) dish is repaiied in the polish of CBN single-point lathe tool: vertical turning pattern, repair open cold blower fan while dish, cold wind alignment CBN single-point lathe tool 5 and test specimen 1 is made to cool down, repairing the rotating speed of test specimen 1 during dish is 3000rpm, CBN single-point lathe tool 5 outside test specimen 1 with the cutting-in of 2 μm along test specimen radial feed, feed speed ranges for 0.1～0.3mm/s, and feeding distance is 100mm；
Repair the contrast of test specimen 1 three-dimensional surface shape and end face run-out amount before and after dish and see Fig. 3 and Fig. 4 respectively；
3) tool setting gauge 4 touched by CBN single-point lathe tool 5, it is determined that repair disk area 3 and the tool setting gauge 4 difference in height h to cutter plane0；CBN single-point lathe tool 5 is taken off from support, it is replaced by the tool heads 2 that top soldering has the spherical wear particles of single radius 0.04mm, tool heads 2 top moves closer to tool setting gauge 4, when measuring system data and producing sudden change, the abrasive particle on representational tool head 2 top just touches tool setting gauge 4 to cutter plane, then shifting h on axial direction tool heads 2 rotated along test specimen0+ δ, so that the abrasive particle on tool heads 2 top is positioned at test specimen 1 and repaiies δ place above disk area 3, completes cutter, thus can accurately control the scratching degree of depth when ensureing follow-up test；
4) tool heads 2 level is moved to directly over the scratching point repairing disk area 3, and move down δ+apSo that the scratching degree of depth is ap；Scratching radius R according to the scratching speed v that need to test and scratching point place, passes throughThe setting speed n of calculation testing piece 1；Among the present embodiment, n=10000rpm, scratching speed v is 157m/s (corresponding R=200mm position)～209m/s (corresponding R=150mm position), scratching degree of depth apIt is respectively set as 5 μm, 10 μm, 15 μm, 20 μm, 25 μm；Open cold blower fan, cold wind alignment tools head and test specimen is made to cool down, test specimen 1 rotates according to above-mentioned setting speed n, and tool heads 2 is radially with the speed feeding of 2m/s, so that abrasive particle forms the continuous helical shape cut that spacing is 200 μm repairing disk area 3, the cut number of turns is more than 3, and the three-dimensional appearance of cut and cross sectional shape figure thereof are as shown in Figure 5, it can be seen that the depth direction error between multiple tracks cut is less than 1 μm/1mm；
5) scratching process gathers the data in scratching process by the dynamometer being connected with tool heads 2 and acoustic emission system, and by signal amplifier transmission to data collecting card, transmit again and be calculated to computer, the physical quantitys such as scratching power, acoustic emission signal can be obtained.
Among the present embodiment, the natural frequency of described dynamometer is higher than 4KHz, and dynamometry precision is better than 0.01N；The sample rate of described data collecting card is higher than 2M/s.
Embodiment 2
The present embodiment and embodiment 1 are different in that, described tool heads top soldering has the spherical abrasive particle of single radius 0.08mm, and all the other are with embodiment 1.
As required, described abrasive particle can be diamond, CBN, oxide ceramics or nitride ceramics；Abrasive particle shape can also be cone or polygonal pyramid shape；This abrasive particle is fixed in tool heads top by mechanical grip, plating or soldering；Described tool heads can be pressure head or other fixed grain form.
As required, repairing the parameter of dish and adjust in following scope and carry out one or many and repair dish, can form end face run-out amount in surface of test piece and be better than IT1 level, what surface average roughness Ra was better than 10nm repaiies disk area:
2-1) dish is repaiied in the roughing of CBN single point cutter: vertical turning pattern, while repairing dish, CBN single point cutter and test specimen are cooled down, repairing the range of speeds of test specimen during dish is 2000～10000rpm, CBN single point cutter outside test specimen with the cutting-in of 10～50 μm along test specimen radial feed, feed speed ranges for 0.4～1.2mm/s, and feeding distance is the 1/4～1/2 of test specimen diameter；
2-2) dish is repaiied in the polish of CBN single point cutter: vertical turning pattern, while repairing dish, CBN single point cutter and test specimen are cooled down, repairing the range of speeds of test specimen during dish is 2000～10000rpm, CBN single point cutter outside test specimen with the cutting-in of 2～10 μm along test specimen radial feed, feed speed ranges for 0.1～0.3mm/s, and feeding distance is the 1/4～1/2 of test specimen diameter.
Comparative example
Take ferrous metal test specimen, after conventional finish turning processes, surface of test piece is divided into two regions, one of them region carries out repairing dish according to the dish step of repairing of the present invention, making its surface quality reach end face run-out amount and be better than IT1 level, surface average roughness Ra is better than 10nm, is designated as and repaiies disk area；Another region does not carry out repairing dish, is designated as and does not repair disk area.
Above-mentioned test specimen adopt the method for testing of the present invention carry out single the continuous scratching test of abrasive particle, repairing disk area and do not repairing formation cut in disk area under same test parameter, scratch depth is only small, micron order can be reached, its comparing result is as shown in Figure 6, can be seen that, when scratch depth is only small, the cut repairing disk area forms coherent spiral type, it is distributed in uniform intervals, detect its depth direction error less than 1 μm/1mm, show that abrasive particle all can contact in the relatively dash wiping distance repairing in disk area continually and steadily with test specimen, such that it is able to realize the high-speed, high precision scratching test of abrasive particle；And the cut not repairing disk area can not form coherent spiral type, differ in cut interval, and the cut depth, scratch width are respectively provided with macroscopic diversity, it was shown that cannot contact continually and steadily between abrasive particle and test specimen, it is difficult to realizes the high-speed, high precision scratching test of abrasive particle.
The above, be only present pre-ferred embodiments, therefore can not limit scope of the invention process according to this, and the equivalence namely made according to the scope of the claims of the present invention and description changes and modifies, and all should still belong in the scope that the present invention contains.
Claims (10)
1. the continuous scratching method of testing of single abrasive particle that ferrous metal test specimen repaiied in advance by a CBN cutter, it is characterised in that: including:
1) being fixed on electro spindle by ferrous metal test specimen, test specimen can be rotated by electro spindle；This test specimen is carried out on-line dynamic balancing；
2) adopting CBN single point cutter that this test specimen is repaiied dish, be better than IT1 level forming end face run-out amount in surface of test piece, what surface average roughness Ra was better than 10nm repaiies disk area, specifically comprises the following steps that
2-1) dish is repaiied in the roughing of CBN single point cutter: vertical turning pattern, while repairing dish, CBN single point cutter and test specimen are cooled down, repairing the range of speeds of test specimen during dish is 2000～10000rpm, CBN single point cutter outside test specimen with the cutting-in of 10～50 μm along test specimen radial feed, feed speed ranges for 0.4～1.2mm/s, and feeding distance is the 1/4～1/2 of test specimen diameter；
2-2) dish is repaiied in the polish of CBN single point cutter: vertical turning pattern, while repairing dish, CBN single point cutter and test specimen are cooled down, repairing the range of speeds of test specimen during dish is 2000～10000rpm, CBN single point cutter outside test specimen with the cutting-in of 2～10 μm along test specimen radial feed, feed speed ranges for 0.1～0.3mm/s, and feeding distance is the 1/4～1/2 of test specimen diameter；
3) CBN single point cutter touching tool setting gauge, it is determined that repair disk area and the tool setting gauge difference in height h to cutter plane0；CBN single point cutter is replaced by top and is connected with the tool heads of single abrasive particle, the abrasive particle on tool heads top touching tool setting gauge, then shifting h on the axial direction that tool heads is rotated along test specimen0+ δ, so that the abrasive particle on tool heads top is positioned at test specimen and repaiies δ place above disk area, completes cutter；
4) tool heads is moved to directly over the scratching point repairing disk area, and move down δ+apSo that the scratching degree of depth is ap；Scratching radius R according to the scratching speed v that need to test and scratching point place, passes throughThe setting speed n of calculation testing piece；Test specimen rotates according to setting speed n, and tool heads radially feeding, so that abrasive particle forms spiral scratch repairing disk area scratching, by the data in the measurement system acquisition scratching process that is connected with tool heads in this process；While scratching, tool heads and test specimen are cooled down.
2. the continuous scratching method of testing of single abrasive particle that ferrous metal test specimen repaiied in advance by a kind of CBN cutter according to claim 1, it is characterized in that: described abrasive particle is diamond, CBN, oxide ceramics or nitride ceramics, abrasive particle is shaped as spherical, conical or polygonal pyramid shape；This abrasive particle is fixed in tool heads top by mechanical grip, plating or soldering；Described tool heads is pressure head.
3. the continuous scratching method of testing of single abrasive particle that ferrous metal test specimen repaiied in advance by a kind of CBN cutter according to claim 1, it is characterised in that: described test specimen is disc.
4. the continuous scratching method of testing of single abrasive particle that ferrous metal test specimen repaiied in advance by a kind of CBN cutter according to claim 1, it is characterized in that: described measurement system is dynamometry and acoustic emission system, including dynamometer, acoustic emission system, data collecting card and signal amplifier that mutual signal connects；Described tool heads is connected with dynamometer and acoustic emission system.
5. the continuous scratching method of testing of single abrasive particle that ferrous metal test specimen repaiied in advance by a kind of CBN cutter according to claim 4, it is characterised in that: the natural frequency of described dynamometer is higher than 4KHz, and dynamometry precision is better than 0.01N；The sample rate of described data collecting card is higher than 2M/s.
6. the continuous scratching method of testing of single abrasive particle that ferrous metal test specimen repaiied in advance by a kind of CBN cutter according to claim 3, it is characterized in that: described step 2) in, repair during dish the feeding distance of CBN cutter less than test specimen radius, described in repair disk area be annular.
7. the continuous scratching method of testing of single abrasive particle that ferrous metal test specimen repaiied in advance by a kind of CBN cutter according to claim 1, it is characterised in that: described tool heads is superior to 0.1 μm in the positioning precision of the axial direction rotated along test specimen and radial direction.
8. the continuous scratching method of testing of single abrasive particle that ferrous metal test specimen repaiied in advance by a kind of CBN cutter according to claim 1, it is characterised in that: the positioning precision of described tool setting gauge is better than 0.1 μm.
9. the continuous scratching method of testing of single abrasive particle that ferrous metal test specimen repaiied in advance by a kind of CBN cutter according to claim 1, it is characterised in that: described cut is continuous helical shape cut, and the cut number of turns is more than 3.
10. the continuous scratching method of testing of single abrasive particle that ferrous metal test specimen repaiied in advance by a kind of CBN cutter according to claim 1, it is characterised in that: described tool heads axis is parallel to test specimen rotation axis.
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| CN114216847B (en) * | 2021-11-19 | 2024-01-16 | 南方科技大学 | Constant-temperature single-point scratching experiment device, feeding system thereof and single-point scratching experiment method |
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