CN105651635A - High-speed friction testing method for spherical grinding head prepared ferrous metal friction pair - Google Patents
High-speed friction testing method for spherical grinding head prepared ferrous metal friction pair Download PDFInfo
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Abstract
The invention discloses a high-speed friction testing method for a spherical grinding head prepared ferrous metal friction pair, and belongs to the field of tribological testing and precision and ultraprecision machining. A ferrous metal friction disk is fixed to an electric spindle, and subjected to online dynamic balancing; then a spherical grinding head is adopted for finishing the friction disk, and the requirement of end face run-out and roughness needed for testing is met; then a friction tool is clamped on a clamp connected with a force feedback device, ball-disk tests, pin-disk tests and other friction tests are carried out, the friction disk rotates at the specified rotating speed, the friction tool and the friction disk are in contact, the pressure between the friction tool and the friction disk is fixed as a set testing value, testing is finished till the set time, and friction force, acoustic emission signals and other physical quantities are collected by a measuring system in the process. According to the high-speed friction testing method, high-speed friction testing can be achieved.
Description
Technical field
The invention belongs to tribology tester and precise and ultraprecise machining field, be specifically related to a kind of spherical mounted point and repair the high-speed friction method of testing of ferrous metal friction pair in advance.
Background technology
Fretting wear occurs significant for aspects such as the selection of part material, structural design, cooling and lubricating way choice at occasion, coefficient of friction and wear courses such as high-speed rotating machine, material machining, mechanism's reciprocating motions. Wherein high-speed friction abrasion has again the feature different with general fretting wear: the inertia force that 1. (linear velocity is more than 15m/s) produces at a high speed can affect the adhesive ability of lubricating oil, lubricating oil from friction area extrusion or is thrown away, causes the increase of coefficient of friction; 2. high-speed friction is along with the severe plastic deformation of actual contact point, thus adding the material flowing at contact point place, reducing shearing resistance, and then reducing coefficient of friction; 3. in high-speed friction, the plastic deformation at actual contact point place result in the generation of heat and the rising of temperature, adds the chemical affinity interaction between friction pair, thus adding coefficient of friction. In view of the complexity of high-speed friction physical process, high-speed friction abrasion has become as the hot issue of current academia research.
The test of general fretting wear includes in the various rubbing methods such as ball dish, pin dish, dish dish, four balls and associated friction abrasion tester thereof, friction pair produces break-in effect at the friction initial stage, reach stable through Frotteurism after a period of time, enter and stablize wear stage, now the physical quantity such as the relative displacement of apparatus measures friction pair, frictional force, calculates coefficient of friction and wear rate. For the existing test method of high-speed friction there is problems in that 1. in high speed processes friction pair to realize the condition of period of adjustment comparatively harsh, even without occurring stablizing wear stage and directly arriving the heavy wear stage; 2. high-speed friction process has serious wear to grinder, even if having reached stable wear stage, the geometry of grinder tool also being had occurred that obvious change, have impact on the precision of test and accuracy; 3. the produced huge inertia force of high-speed friction high speed rotation has had a strong impact on the precision of friction testing.Because the restriction of the problems referred to above, the maximum speed level of existing business friction wear testing machine is probably at 5000rpm (frictional disk of diameter 50mm), and linear velocity is roughly equal to 7.87m/s, it is difficult to reach the test request of high-speed friction.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art part, provide a kind of spherical mounted point and repair the high-speed friction method of testing of ferrous metal friction pair in advance, it is intended to reduce the period of adjustment, utilize spherical mounted point that ferrous metal frictional disk is repaiied dish online, ensure form accuracy and the relative positional accuracy of friction pair, increased the stability of friction process by dynamic balancing simultaneously, device for force feedback can ensure to the constant pressure between grinder tool and frictional disk in friction testing process, thus realizing high-speed friction test.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of spherical mounted point repaiies the friction testing method of ferrous metal friction pair in advance, including:
1) being fixed on electro spindle by ferrous metal frictional disk, frictional disk can be rotated by electro spindle; This frictional disk is carried out on-line dynamic balancing;
2) adopting spherical mounted point that this frictional disk is repaiied dish, be better than IT1 level forming end face run-out amount on frictional disk surface, what surface average roughness Ra was better than 10nm repaiies disk area, specifically comprises the following steps that
2-1) dish is repaiied in spherical mounted point roughing: the range of speeds of frictional disk is 3000��10000rpm, spherical mounted point is with the rotating speed rotation of 8000��20000rpm, simultaneously outside frictional disk with the cutting-in of 10��50 ��m along frictional disk radial feed, feed speed ranges for 0.4��1.2mm/s, and feeding distance is the 1/4��1/2 of frictional disk diameter;
2-2) dish is repaiied in spherical mounted point polish: the range of speeds of frictional disk is 3000��10000rpm, spherical mounted point is with the rotating speed rotation of 8000��20000rpm, simultaneously outside frictional disk with the cutting-in of 2��10 ��m along frictional disk radial feed, feed speed ranges for 0.1��0.3mm/s, and feeding distance is the 1/4��1/2 of frictional disk diameter;
3) grinder will be had clamping on the fixture being connected with device for force feedback;
4) friction testing is carried out: according to the scratching speed v that need to test and the test point radius R repairing disk area build-in test point place, pass throughCalculate the setting speed n of frictional disk; Frictional disk rotates according to setting speed n, grinder tool will be moved to directly over test point, and move down and contact with frictional disk, until frictional disk with reach testing setup value to grinding Tool Room pressure, carry out friction testing; Test process ensures pressure between grinder tool and frictional disk is held constant at testing setup value by device for force feedback, simultaneously by measuring the data in system acquisition scratching process.
In one embodiment: described is friction ball or friction pin to grinder tool.
In one embodiment: described frictional disk 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 to grinder tool be 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.
In one embodiment: the sample rate of described data collecting card is higher than 2M/s.
In one embodiment: described step 2) in, repair during dish that the feeding distance of spherical mounted point is less than frictional disk radius, repairing disk area is annular.
In one embodiment: described step 2) in, repair the direction of rotation of frictional disk and the direction of rotation of spherical mounted point during dish identical or contrary.
In one embodiment: described spherical mounted point axis is parallel to frictional disk rotation axis.
In one embodiment: while repairing dish, spherical mounted point and frictional disk are cooled down.
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
The method of testing of the present invention avoids the significantly end face run-out in frictional disk high-speed rotation or circular runout by dynamic balancing, thus increasing the stability of friction process; Meanwhile, utilize spherical mounted point that frictional disk is carried out on-line machining, it is ensured that the form accuracy of friction pair and relative positional accuracy, thus ensure that the relative motion precision of friction pair, reducing the period of adjustment of friction pair, reducing abrasion; Combining ability feedback device ensures in friction testing process the constant pressure between grinder tool and frictional disk again, further ensures precision and the accuracy of test, it is possible to realize high-speed friction test.
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 frictional disk three-dimensional surface shape before and after dish in the embodiment of the present invention 1, wherein Fig. 3 a for before repairing dish (through conventional planar accurate grinding processes), Fig. 3 b is for after repairing dish.
Fig. 4 repaiies the contrast of frictional disk surface end face jerk value before and after dish in the embodiment of the present invention 1, wherein Fig. 4 a for before repairing dish (through conventional planar accurate grinding processes), its end face run-out amount maximum is up to 16 ��m; Fig. 4 b is for after repairing dish, and its end face run-out amount maximum is 8.9 ��m.
Fig. 5 is the friction coefficient curve that the embodiment of the present invention 2 obtains, and wherein abscissa is fraction time, and vertical coordinate is coefficient of friction.
Accompanying drawing labelling: frictional disk 1, friction ball 2, repair disk area 3, fixture 4, device for force feedback 5, spherical mounted point 6.
Detailed description of the invention
Illustrate present disclosure by the examples below:
Embodiment 1
A kind of spherical mounted point repaiies the high-speed friction method of testing of ferrous metal friction pair in advance, and the device adopted includes:
Lathe, disc ferrous metal frictional disk 1 is installed on the electro spindle of lathe, and frictional disk 1 can be rotated by electro spindle;
Dynamic balance instrument, for carrying out on-line dynamic balancing to frictional disk 1;
Spherical mounted point 6, for repairing dish to frictional disk 1 end face; This spherical mounted point 6 is installed in support dismantledly, and is installed in lathe movably by support; Spherical mounted point 6 axis is parallel to frictional disk 1 rotation axis;
Grinder is had, and for friction ball or friction pin, clamping is on the fixture 4 being connected with device for force feedback 5; This fixture 4 is installed in support dismantledly, and is installed in lathe movably by support; Grinder tool can be passed through axial direction that fixture 4 and support rotate at frictional disk 1 and move in the radial direction, and more high more good in the positioning precision of both direction, it is desirable to it is better than 0.1 ��m; This device for force feedback 5 is that pressure-Displacement Feedback regulates device, can pass through to detect to pressure change between grinder tool and frictional disk 1, the height that grinder is had in the axial direction is finely tuned by feedback ground by fixture 4, thus ensureing pressure between grinder tool and frictional disk 1 can be kept constant;
Measurement system, for dynamometry and acoustic emission system, including dynamometer, acoustic emission system, data collecting card and signal amplifier that mutual signal connects; Grinder tool is connected by this with dynamometer and acoustic emission system;Data acquisition card signal connects computer; The natural frequency of 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.
Air-cooler: for the spherical mounted point 6 repaiied in dish process and frictional disk 1, and grinder tool and frictional disk 1 blow cooling by scratching process.
Concrete method of testing is as follows:
1) being fixed on the electro spindle of lathe by the 45 steel disc frictional disks 1 of diameter 300mm by the mode such as magnetic suction disc or mechanical clamp, frictional disk 1 can be rotated by electro spindle; With dynamic balance instrument, this frictional disk 1 is carried out on-line dynamic balancing, to reduce the frictional disk 1 vibration when high speed rotating, thus ensureing grinder tool can stably be contacted by scratching process with frictional disk 1;
2) adopt spherical mounted point 6 that this frictional disk 1 is repaiied dish, first carry out roughing, carry out polish again, to form end face run-out amount 8.9 ��m on frictional disk 1 surface, the annular of surface average roughness Ra 5.25nm repaiies disk area 3, to reduce frictional disk 1 end face run-out amount, improves surface quality, it is further ensured that in scratching process and grinder tool can stably be contacted with frictional disk 1, specifically comprise the following steps that
2-1) dish is repaiied in spherical mounted point roughing: repair open cold blower fan while dish, cold wind alignment spherical mounted point 6 and frictional disk 1 is made to cool down, repairing the rotating speed of frictional disk 1 during dish is 3000rpm, spherical mounted point 6 is with the rotating speed rotation of 10000rpm, simultaneously outside frictional disk 1 with the cutting-in of 10 ��m along frictional disk 1 radial feed, feed speed ranges for 0.4��1.2mm/s, and feeding distance is 110mm;
2-2) dish is repaiied in spherical mounted point polish: repair open cold blower fan while dish, cold wind alignment spherical mounted point 6 and frictional disk 1 is made to cool down, repairing the rotating speed of frictional disk 1 during dish is 3000rpm, spherical mounted point 6 is with the rotating speed rotation of 10000rpm, simultaneously outside frictional disk 1 with the cutting-in of 2 ��m along frictional disk 1 radial feed, feed speed ranges for 0.1��0.3mm/s, and feeding distance is 110mm;
Repair the contrast of frictional disk 1 three-dimensional surface shape and end face run-out amount before and after dish and see Fig. 3 and Fig. 4 respectively;
3) grinder will be had clamping on the fixture 4 being connected with device for force feedback 5; Among the present embodiment, to the aluminium oxide ceramics friction ball 2 that grinder tool is diameter 4mm;
4) ball-dish friction testing is carried out: according to the scratching speed v that need to test and the test point radius R repairing disk area build-in test point place, pass throughCalculate the setting speed n of frictional disk 1; Among the present embodiment, R=50mm, scratching speed v=15.7m/s, n=3000rpm; Frictional disk 1 rotates according to above-mentioned setting speed n, grinder tool will be moved to directly over test point, and move down and contact with frictional disk 1, and until frictional disk 1 reaches testing setup value 1N with to mill Tool Room pressure, carry out friction testing; The fixture 4 position on the axial direction that frictional disk 1 rotates is finely tuned by test process by device for force feedback 5, to ensure that between friction ball 2 and frictional disk 1, pressure remains constant in 1N, by the data in the measurement system acquisition scratching process that is connected with friction ball 2 during test, and by signal amplifier transmission to data collecting card, transmit again and be calculated to computer, the physical quantity such as frictional force, acoustic emission signal can be obtained; The ratio of frictional force and constant contact pressure 1N is coefficient of friction, can pass through friction value calculating and obtain.
Embodiment 2
1) being fixed on the electro spindle of lathe by modes such as 45 pinion steel 42CrMoV (HRC50) the disc frictional disk magnetic suction discs of diameter 300mm or mechanical clamps, frictional disk can be rotated by electro spindle;With dynamic balance instrument, this frictional disk is carried out on-line dynamic balancing, to reduce the frictional disk vibration when high speed rotating, thus ensureing grinder tool can stably be contacted by scratching process with frictional disk;
2) adopt spherical mounted point that this frictional disk is repaiied dish, first carry out roughing, carry out polish again, to be better than IT1 level in frictional disk surface formation end face run-out amount, surface average roughness Ra is better than the annular of 10nm and repaiies disk area, to reduce frictional disk end face run-out amount, improves surface quality, it is further ensured that in scratching process and grinder tool can stably be contacted with frictional disk, specifically comprise the following steps that
2-1) dish is repaiied in spherical mounted point roughing: repair open cold blower fan while dish, cold wind alignment spherical mounted point and frictional disk is made to cool down, repairing the rotating speed of frictional disk during dish is 6000rpm, spherical mounted point is with the rotating speed rotation of 15000rpm, simultaneously outside frictional disk with the cutting-in of 12 ��m along frictional disk radial feed, feed speed ranges for 0.4��1.2mm/s, and feeding distance is 110mm;
2-2) dish is repaiied in spherical mounted point polish: repair open cold blower fan while dish, cold wind alignment spherical mounted point and frictional disk is made to cool down, repairing the rotating speed of frictional disk during dish is 6000rpm, spherical mounted point is with the rotating speed rotation of 15000rpm, simultaneously outside frictional disk with the cutting-in of 5 ��m along frictional disk radial feed, feed speed ranges for 0.1��0.3mm/s, and feeding distance is 110mm;
3) grinder will be had clamping on the fixture being connected with device for force feedback; Among the present embodiment, to the non-coated carbides friction ball of P30 that grinder tool is diameter 4mm;
4) ball-dish friction testing is carried out: according to the scratching speed v that need to test and the test point radius R repairing disk area build-in test point place, pass throughCalculate the setting speed n of frictional disk; Among the present embodiment, R=101.9mm, scratching speed v=64m/s, n=6000rpm; Frictional disk rotates according to above-mentioned setting speed n, grinder tool will be moved to directly over test point, and move down and contact with frictional disk, until frictional disk with reach testing setup value 1N to grinding Tool Room pressure, carry out friction testing; Fixture position on the axial direction that frictional disk rotates is finely tuned by test process by device for force feedback, to ensure that between friction ball and frictional disk, pressure remains constant in 1N, by the data in the measurement system acquisition scratching process that is connected with friction ball during test, and by signal amplifier transmission to data collecting card, transmit again and be calculated to computer, the physical quantity such as frictional force, acoustic emission signal can be obtained; The ratio of frictional force and constant contact pressure 1N is coefficient of friction, can pass through friction value calculating and obtain.
The friction coefficient curve that the present embodiment obtains is as shown in Figure 5.
Comparative example
This comparative example and embodiment 2 are different in that, frictional disk are not repaiied dish before carrying out friction testing. All the other equipment, parameter, method equivalent integers 2.
Result shows: repairing dish, the contact stabilization deficiency of friction ball and the frictional disk to mill, the less stable of coefficient of friction in this comparative example in advance, instantaneous friction velocity is even more than 1; And after embodiment 2 having carried out repair dish in advance, friction ball and to mill frictional disk quickly enter stable contact condition, the good stability of coefficient of friction, test result is more accurate, repair the feedback response rate request of the instrument such as force transducer in the friction testing process after dish in advance to significantly reduce, it is easy to lowering apparatus cost and reach the higher coefficient of sliding friction.
As required, can being friction ball or friction pin to grinder tool, what correspondingly carry out be ball-dish friction testing or pin-dish friction testing.
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 on frictional disk surface and be better than IT1 level, what surface average roughness Ra was better than 10nm repaiies disk area:
2-1) dish is repaiied in spherical mounted point roughing: while repairing dish, spherical mounted point and frictional disk are cooled down, repairing the range of speeds of frictional disk during dish is 3000��10000rpm, spherical mounted point is with the rotating speed rotation of 8000��20000rpm, simultaneously outside frictional disk with the cutting-in of 10��50 ��m along frictional disk radial feed, feed speed ranges for 0.4��1.2mm/s, and feeding distance is the 1/4��1/2 of frictional disk diameter; Repair during dish the direction of rotation of frictional disk and the direction of rotation of spherical mounted point can identical can also be contrary, speed of related movement can be increased on the contrary, improve crudy;
2-2) dish is repaiied in spherical mounted point polish: while repairing dish, spherical mounted point and frictional disk are cooled down, repairing the range of speeds of frictional disk during dish is 3000��10000rpm, spherical mounted point is with the rotating speed rotation of 8000��20000rpm, simultaneously outside frictional disk with the cutting-in of 2��10 ��m along frictional disk radial feed, feed speed ranges for 0.1��0.3mm/s, and feeding distance is the 1/4��1/2 of frictional disk diameter; Repair during dish the direction of rotation of frictional disk and the direction of rotation of spherical mounted point can identical can also be contrary, speed of related movement can be increased on the contrary, improve crudy.
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. a spherical mounted point repaiies the friction testing method of ferrous metal friction pair in advance, it is characterised in that: including:
1) being fixed on electro spindle by ferrous metal frictional disk, frictional disk can be rotated by electro spindle; This frictional disk is carried out on-line dynamic balancing;
2) adopting spherical mounted point that this frictional disk is repaiied dish, be better than IT1 level forming end face run-out amount on frictional disk surface, what surface average roughness Ra was better than 10nm repaiies disk area, specifically comprises the following steps that
2-1) dish is repaiied in spherical mounted point roughing: the range of speeds of frictional disk is 3000��10000rpm, spherical mounted point is with the rotating speed rotation of 8000��20000rpm, simultaneously outside frictional disk with the cutting-in of 10��50 ��m along frictional disk radial feed, feed speed ranges for 0.4��1.2mm/s, and feeding distance is the 1/4��1/2 of frictional disk diameter;
2-2) dish is repaiied in spherical mounted point polish: the range of speeds of frictional disk is 3000��10000rpm, spherical mounted point is with the rotating speed rotation of 8000��20000rpm, simultaneously outside frictional disk with the cutting-in of 2��10 ��m along frictional disk radial feed, feed speed ranges for 0.1��0.3mm/s, and feeding distance is the 1/4��1/2 of frictional disk diameter;
3) grinder will be had clamping on the fixture being connected with device for force feedback;
4) friction testing is carried out: according to the scratching speed v that need to test and the test point radius R repairing disk area build-in test point place, pass throughCalculate the setting speed n of frictional disk; Frictional disk rotates according to setting speed n, grinder tool will be moved to directly over test point, and move down and contact with frictional disk, until frictional disk with reach testing setup value to grinding Tool Room pressure, carry out friction testing;Test process ensures pressure between grinder tool and frictional disk is held constant at testing setup value by device for force feedback, simultaneously by measuring the data in system acquisition scratching process.
2. a kind of spherical mounted point according to claim 1 repaiies the friction testing method of ferrous metal friction pair in advance, it is characterised in that: described is friction ball or friction pin to grinder tool.
3. a kind of spherical mounted point according to claim 1 repaiies the friction testing method of ferrous metal friction pair in advance, it is characterised in that: described frictional disk is disc.
4. a kind of spherical mounted point according to claim 1 repaiies the friction testing method of ferrous metal friction pair in advance, 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 to grinder tool be connected with dynamometer and acoustic emission system.
5. a kind of spherical mounted point according to claim 4 repaiies the friction testing method of ferrous metal friction pair in advance, it is characterised in that: the natural frequency of described dynamometer is higher than 4KHz, and dynamometry precision is better than 0.01N.
6. a kind of spherical mounted point according to claim 4 repaiies the friction testing method of ferrous metal friction pair in advance, it is characterised in that: the sample rate of described data collecting card is higher than 2M/s.
7. a kind of spherical mounted point according to claim 3 repaiies the friction testing method of ferrous metal friction pair in advance, it is characterised in that: described step 2) in, repair during dish that the feeding distance of spherical mounted point is less than frictional disk radius, repairing disk area is annular.
8. a kind of spherical mounted point according to claim 1 repaiies the friction testing method of ferrous metal friction pair in advance, it is characterised in that: described step 2) in, repair the direction of rotation of frictional disk and the direction of rotation of spherical mounted point during dish identical or contrary.
9. a kind of spherical mounted point according to claim 1 repaiies the friction testing method of ferrous metal friction pair in advance, it is characterised in that: described spherical mounted point axis is parallel to frictional disk rotation axis.
10. a kind of spherical mounted point according to claim 1 repaiies the friction testing method of ferrous metal friction pair in advance, it is characterised in that: while repairing dish, spherical mounted point and frictional disk are cooled down.
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