CN1554782A - Magnetically modifying method for increasing ferro magnetic metal wear resistance - Google Patents
Magnetically modifying method for increasing ferro magnetic metal wear resistance Download PDFInfo
- Publication number
- CN1554782A CN1554782A CNA2003101234412A CN200310123441A CN1554782A CN 1554782 A CN1554782 A CN 1554782A CN A2003101234412 A CNA2003101234412 A CN A2003101234412A CN 200310123441 A CN200310123441 A CN 200310123441A CN 1554782 A CN1554782 A CN 1554782A
- Authority
- CN
- China
- Prior art keywords
- fighting
- magnetic
- modification
- magnetic field
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 46
- 230000005294 ferromagnetic effect Effects 0.000 title claims abstract description 19
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 17
- 239000002184 metal Substances 0.000 title claims abstract description 17
- 230000005291 magnetic effect Effects 0.000 claims abstract description 87
- 238000012986 modification Methods 0.000 claims abstract description 63
- 230000004048 modification Effects 0.000 claims abstract description 63
- 239000000463 material Substances 0.000 claims abstract description 31
- 238000005259 measurement Methods 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims abstract description 7
- 238000012545 processing Methods 0.000 claims description 13
- 230000005415 magnetization Effects 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims description 2
- 238000002474 experimental method Methods 0.000 description 12
- 229910000831 Steel Chemical group 0.000 description 11
- 239000010959 steel Chemical group 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 9
- 230000000875 corresponding effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- 229910001208 Crucible steel Inorganic materials 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 4
- 230000004580 weight loss Effects 0.000 description 4
- 238000003913 materials processing Methods 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 244000137852 Petrea volubilis Species 0.000 description 2
- 239000006061 abrasive grain Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000003245 working effect Effects 0.000 description 2
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000010219 correlation analysis Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011423 initialization method Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
Images
Landscapes
- Measuring Magnetic Variables (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The method of raising the wear resistance of ferromagnetic metal is to treat ferromagnetic metal part in a specific periodically changed magnetic field for certain time. The magnetic field is generated by one output power source with controlled frequency, peak current and intermittent exciting current. The magnetic field frequency is measured via the measurement of internal loss peak, the treating time via the internal loss value altering with the time, and the magnetic field strength to be applied via the magnetically saturation strength. The reasonable magnetically modification process can raise the hardness and toughness of the material simultaneously, take full use of the latent energy of the material, raise wear resistance and prolong the service time.
Description
Technical field the present invention relates to improve the magnetic method of modifying of ferromagnetic metal wear resistance.
The patent application that background technology (publication number) 1270234 is announced is that pending iron and steel parts is placed a magneticstrength is periodically variable magnetic field, magnetic field is produced by magnetizing apparatus by the magnetizing current with low-frequency pulse waveform of power supply output, and the low-frequency pulse waveform is the trapezoidal wave at intermittence with more precipitous edge, front and back.Its device comprises that output has the magnetizing apparatus that the output terminal of the power supply of magnetizing current of low frequency pulse wave shape and this power supply links to each other.This invention can reduce internal stress.
The principle of this invention be utilize the magnetostriction coefficient of ferrous materials when low-intensity magnetic field is magnetized on the occasion of, and the magnetostriction coefficient when high-intensity magnetic field magnetizes is this ultimate principle of negative value, design corresponding magnetzation current waveform, and make magnetizing current workpiece be magnetized according to certain rule by magnetizing apparatus with designed waveform by power supply output, thereby high internal stress district produces " mangneto vibration " in workpiece, impel a large amount of microcosmos area generation dislocation motions, cause the distortion of dispersivity microplasticity, it is lax that internal stress is taken place, to obtain the effect that reduces inner stress of work.Exist not enough: as can be seen, this invention causes that by " mangneto vibration " dislocation changes, and then causes stress to reduce.But be difficult to quantitatively accurately observe because of " dislocation variation " is, the different sites of same material can distribute to distinct dislocation by electron microscope observation, so the dislocation that the mangneto vibration causes changes, and a kind of explanation that reduces stress also only is provided.Which type of " mangneto vibration " parameter can cause the maximum of stress level to reduce as for, then can only determine, lack the theoretical direction of direct quantitative by experience and experiment.This invention only be that steel construction piece is reduced stress at object, with the present invention propose different at multiple material raising wear resistance special emphasis with scope.The raising result of use that is reduced to of stress level provides a kind of possibility, is not sufficient condition for the structured material that uses in the reality, so even reduced stress, use properties not necessarily obtains desired improvement.Whether and enforcement of the present invention is primarily aimed at the wear resisting property that improves material, change as for stress level, not as direct criterion.In other words, as long as wear resisting property is improved, even improve stress level, remains in the present invention and can pass through; The patent of this invention is at steel construction, and the present invention is directed to the multiple part that ferromagnetic substances such as steel, cast iron and Wimet are made, towards scope also different.Technique initialization method: as previously mentioned, the determining of processing parameter is based on " mangneto vibration " and dislocation motion and the empirical value that proposes, do not propose to determine the method for " mangneto vibration " parameter, need be determined by experiment at differing materials, difform structure.The present invention then can quantitatively determine the scope of differing materials magnetic modified technique by experiment, better brings into play the potential of magnetic modification, the deficiency of avoiding experience to determine.
In sum, the magnetic treatment processing parameter that this patent proposed is that the dependence experience is carried out; On application point, directly do not relate to the raising aspect of wear resistance.
The cutter device for magnetic treatment that the utility model patent of (publication number) 2221031 provides relates to the finished product cutter is carried out magnetic treatment, to reduce unrelieved stress, improves the device in its work-ing life.This device mainly partly is made up of excitation supply, single chip computer control system and magnetizing coil etc.Can produce direct current, alternation and pulsed magnetic field, its waveform, frequency, field intensity and work period can be regulated within the specific limits, can be to the new cutter of rapid steel, Wimet and coating or the cutter after refacing carry out magnetic treatment.The utility model of (publication number) 2527571 relates to a kind of cutter device for magnetic treatment, above-mentioned utility model patent is according to containing the cutter material of magnetic element under suitable magnetic excitation and magnetostriction effect, helping material internal residual stress discharges and proposition cutter device for magnetic treatment, to reduce unrelieved stress, improve its work-ing life.
Existing problems are: under the action of a magnetic field, stress is the research that this important rule how to reduce is not seen in report; Whether unrelieved stress constitutes the subject matter that the influences cutter life demonstration of not being correlated with; The principal element that influences cutter life lacks correlation analysis.So, improve cutter life by magnetic treatment, even demonstrate better effects by the reality use, its corresponding theory support for want of, the magnetic treatment technology that must cause being proposed is experimental, treatment effect is unsettled.Also have, above-mentioned utility model patent mainly is rapid steel and Wimet at cutter material, and steel and cast iron for other types do not have respective description.The determining of the processing parameter of above-mentioned utility model patent rule of thumb set with the exportable situation of equipment, lacks its corresponding theory analysis, and the reasonable process scope of determining certain material need spend the more time.
Summary of the invention causes that by " mangneto vibration " dislocation changes in order to overcome existing magnetic method of modifying, and then cause stress to reduce and do not improve the deficiency of the key mechanics performance that influences material wear ability, at existing magnetic treatment technology is experimental, treatment effect is unsettled, the invention provides a kind of magnetic method of modifying that improves the ferromagnetic metal wear resistance.
The technical solution adopted for the present invention to solve the technical problems is by quantitatively determining the magnetic modified technique, make material internal produce the dislocation born of the same parents, improves wear resistance thereby hardness and toughness improve simultaneously.Be described in detail as follows:
Definite method of magnetic modified technique: the basic goal of magnetic modified technique is to form the dislocation born of the same parents, and the dislocation born of the same parents form magnetic field and three underlying conditions of rational modification time that the required condition that possesses comprises rational modification frequency, certain intensity.So frequency, field intensity and modification time are required definite object.
Step 1: determine frequency: the multi-functional in-fighting instrument that the present invention is developed by Chinese Academy of Sciences's solid-state physics carries out the measurement at in-fighting peak.Size and dimension is according to the rules made sample, puts into the measurement that the in-fighting instrument carries out the in-fighting peak, by changing frequency, can measure the frequency that takes place under the in-fighting maximum case, and this frequency promptly is defined as the operating frequency of magnetic modification.
For the magnetic modification, be energy change microtexture in essence by input, so, have only energy effective utilization just can effectively change microtexture with input.And the in-fighting value tolerance of the external energy of absorbed just, the in-fighting value is big more, and it is many more that unit volume absorbs intake.So by the relation of research in-fighting value and magnetic modification frequency, it is bigger just can to obtain the in-fighting value that the modification frequency causes in that scope, starts formation dislocation born of the same parents thereby be beneficial to dislocation.
By the in-fighting theory, satisfy relation between known in-fighting and the frequency: Q among the figure as Fig. 1
-1Be the in-fighting value, ω is a vibrational frequency.As can be seen from Figure 1, at normal temperatures, the in-fighting value that different frequency is corresponding down is different, produces maximum in-fighting and is worth pairing frequencies omega
m, be the determined frequency of magnetic modified technique.
Step 2: determine field intensity: size and dimension according to the rules, make sample, externally-applied magnetic field makes specimen material surpass saturation magnetization and gets final product, or is measured as by vibrating sample magnetometer and makes its specific magnetising moment required field intensity that reaches capacity.
If ferro-magnetics such as ferromagnetic metal are placed periodical magnetic filed, because of of the strain of its crystal grain of magnetostriction with generating period.And the generation of this periodicity forced magnetostriction, dislocation multiplication very important condition just; Because strong magnetic field action helps the motion of dislocation,, field intensity produces strong magnetostriction and the intensity of starting dislocation motion again so should reaching.Generally, enter saturation stage and can satisfy described condition.
Step 3: determine modification time: by to before the same sample modification with different accumulative total modification time situations under the changing conditions of in-fighting value, know: when the in-fighting value enters mild stage of downcomer, can think to produce a large amount of dislocation born of the same parents, reach the purpose that improves wear resistance.The modification time of this accumulation is the modification time under the practical situation.For example to a certain sample, at first fixed temperature and frequency are carried out the measurement of in-fighting value, this value is as original value, after magnetic treatment one period set time, carry out the measurement of in-fighting value under this fixed temperature and the frequency again, then as second measurement point, by that analogy, constantly handle and measure, can obtain a curve, but X-coordinate is the accumulative total modification time as Fig. 2.Corresponding to the accumulative total modification time of the mild stage in-fighting of downcomer value, promptly as the magnetic modification time under this field intensity and the frequency.
Relation as shown in Figure 2 between distributing, in-fighting value and dislocation is arranged: Q among Fig. 2
-1Be the dislocation in-fighting value of material, Λ is a dislocation desity.At the initial stage of the action of a magnetic field, along with the continuous slippage of dislocation, in-fighting is increasing, and (dislocation desity of this moment is decided to be Λ when in-fighting reaches maximum value
m), see Fig. 2, along with the magnetostrictive dislocation desity Λ that proceeds further increases, dislocation configuration will change, and pile up and entanglement mutually, to the effect of dislocation nail nipping bundle, begin to form the dislocation born of the same parents.So in-fighting value Q
-1When decaying to a mild relatively scope rapidly, can think to form a large amount of dislocation born of the same parents this moment, reach the effect of crystal grain thinning.
According to the method for above-mentioned definite magnetic modified technique, some concrete processing parameters have been drawn.In general, range of frequency is: 30 hertz---40 hertz, field strength range is: 1000 oersteds---and 4000 oersteds, modification time is: 300 seconds---600 seconds.
Advantage of the present invention is to improve hardness and these two key mechanics performances that influence wear resistance of toughness simultaneously.For Wear Resistance of Metal Materials, hardness and toughness are the key parameters that influences wear resistance.Generally, the raising of hardness and flexible improve often contradictory, and hardness improves general toughness and can descend, and the toughness raising will reduce hardness usually.The present invention then is on the basis that thermal treatment is finished, and utilizes magnetic action to make dislocation multiplication and tangle to form the dislocation born of the same parents, realizes increasing mill thereby improve hardness and toughness simultaneously.
Compare with foregoing existing magnetic treatment technique, mainly contain the difference of three aspects: the one, to the requirement difference of dislocation form change, the 2nd, the mechanical property of being concerned about is improved the object difference, and the 3rd, the scope difference of treatment process.Prior art is to realize the homogenizing of dislocation, and reduces dislocation desity; The present invention will make dislocation breed as much as possible and tangle, and improves dislocation desity; The decline situation of prior art major concern unrelieved stress, and the present invention improves hardness and toughness, in this process, unrelieved stress often has certain rising; From processing range, also be very different: the frequency aspect, the present invention is at 30 hertz---40 hertz, prior art is at 1 hertz---30 hertz; From the field intensity aspect, the present invention is at 1000 oersteds---4000 oersteds, prior art are more than 250 oersteds; From the modification time aspect, the present invention is at 300 seconds---600 seconds, prior art was not made clearly regulation.So the present invention and existing correlation technique have basic difference at principle, object and process aspect.
In addition, the present invention is determining that aspect the magnetic modified technique be to finish according to the measurement of in-fighting instrument, compares with foregoing correlation technique in theory according to more reliable.
The invention has the beneficial effects as follows that by the enforcement of reasonable magnetic modified technique, material hardness and toughness are improved simultaneously, thereby have further brought into play the potential of material, wear resistance significantly increases, active time obtains prolonging.
Description of drawings
In-fighting value and vibrational frequency graph of a relation under Fig. 1 normal temperature
Fig. 2 in-fighting value and dislocation desity graph of a relation
The corresponding graphic representation of Fig. 3 in-fighting value with modification time
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
Embodiment 1
Present embodiment embodies by the cast steel with high chromium material being carried out the magnetic modification.
Step 1 is determined frequency: cast steel with high chromium materials processing is become 4 millimeters of diameters, and long 100 millimeters thin rod, the multi-functional in-fighting instrument of being developed by Chinese Academy of Sciences's solid-state physics carries out the measurement at in-fighting peak.Under room temperature 20 degrees celsius, by changing excited frequency, determine that the frequency that takes place under the in-fighting maximum case is 30 hertz, this frequency promptly is defined as the operating frequency of magnetic modification.
Step 2 is determined field intensity: cast steel with high chromium materials processing is become 2.85 millimeters of diameters, thick 0.5 millimeter thin slice, put into vibrating sample magnetometer and carry out the measurement of magnetzation curve, can draw when externally-applied magnetic field intensity is 1000 oersteds, its saturation magnetization is 21000 Gausses, so, carry out the magnetic modification add hollow maximum value of magnetic field should be less than 1000 oersteds.
Step 3 is determined modification time: cast steel with high chromium materials processing is become 4 millimeters of diameters, and long 100 millimeters thin rod, the multi-functional in-fighting instrument of being developed by Chinese Academy of Sciences's solid-state physics carries out the measurement of in-fighting value.Keep 20 degrees centigrade of temperature, frequency is not carried out the measurement of in-fighting value through any magnetic modification for 30 hertz, take out sample then, put into air core coil and carry out magnetic treatment, modified technique is that the slow intermittent periods it of falling of the slow liter of waveform changes the field, and amplitude is changed to 0---1000 oersteds, 30 hertz of frequencies, handle after 30 seconds and take out, carry out 20 degrees centigrade again, the measurement of in-fighting value under 30 hertz of conditions of excited frequency.Repeat above line and handle and measure, obtain Fig. 3.
As can be seen from Figure 3, corresponding to the accumulative total modification time of the mild stage in-fighting of downcomer value 300 seconds, promptly as the magnetic modification time under this field intensity and the frequency.
The magnetizing assembly that present embodiment adopts is 0.5 meter of a length, 40 millimeters of internal diameters, and the air core coil of the number of turn 800, power supply large power inverter power source MQ200, outward current magnetizes for 50 amperes.After finishing the determining of required magnetization technology, carry out modification, and carried out Vickers' hardness contrast experiment before and after the modification, impelling strength simultaneous test and abrasive wear contrast experiment according to technology.
Vickers' hardness comparison and detection: take off 3 of 57 * 26 * 10 millimeters sample pieces from same block of material, Vickers' hardness test load 980 newton, protect 30 seconds lotus time, before the processing, average out to 544 before Vickers' hardness is handled is changed to 0 according to the field intensity amplitude---1000 oersteds, 30 hertz of frequencies, handle 300 seconds modified technique, Vickers' hardness is 590 after the modification, improves 8.5%.
Impelling strength simultaneous test: take off 10 of 55 * 10 * 10 millimeters sample pieces from same block of material, wherein 5 are carried out impact ductility test without any processing, the mean value that records impelling strength is 2.45 Jiao, be changed to 0 according to the field intensity amplitude---1000 oersteds, 30 hertz of frequencies, the modified technique of handling 300 seconds carries out modification to remaining 5, and impacting flexible mean value after the modification is 2.91 Jiao, improves 19%.
Abrasive wear contrast experiment: 3 samples that take off 30 millimeters of diameter 6.24 millimeters long from same block of material, virgin state to these samples is carried out abrasive grain wear test, experiment condition is to add 2.2 kilograms counterweight, on 280# sand paper to the mill, each sample carries out 5 wearing and tearing, and the average single wear weight loss of these 15 times wearing and tearing is 0.013 gram; Again these samples are carried out the magnetic modification, modified technique is changed to 0 for the field intensity amplitude---1000 oersteds, 30 hertz of frequencies, handled 300 seconds, according to the method described above sample is carried out weightless measurement again, average single wear weight loss is 0.010 gram, improves wear-out life and reaches 13%.
As can be seen, hardness and toughness are improved simultaneously, its wear resistance be improved significantly.
Embodiment 2
Present embodiment embodies by cutter material rapid steel 9W18Cr4V being carried out the magnetic modification.
Step 1 is determined frequency: rapid steel 9W18Cr4V is processed into 4 millimeters of diameters, and long 100 millimeters thin rod carries out the measurement at in-fighting peak by multi-functional in-fighting instrument.Under room temperature 20 degrees celsius, the operating frequency that is defined as the magnetic modification is 35 hertz.
Step 2 is determined field intensity: rapid steel 9W18Cr4V is processed into 2.85 millimeters of diameters, thick 0.5 millimeter thin slice, put into vibrating sample magnetometer and carry out the measurement of magnetzation curve, can draw when externally-applied magnetic field intensity is 2000 oersteds, its saturation magnetization is 20000 Gausses, so, carry out the magnetic modification add hollow maximum value of magnetic field should be less than 2000 oersteds.
Step 3 is determined modification time: rapid steel 9W18Cr4V is made 4 millimeters of diameters, and long 100 millimeters thin rod carries out the measurement of in-fighting value by multi-functional in-fighting instrument.Similar with embodiment 1, record 20 degrees centigrade of temperature, 35 hertz of frequencies, field intensity 0---the magnetic modification time under the 2000 oersted conditions is 450 seconds.
The magnetizing assembly that present embodiment adopts is 0.5 meter of a length, 40 millimeters of internal diameters, and the air core coil of the number of turn 800, power supply large power inverter power source MQ200, outward current magnetizes for 100 amperes.After finishing the determining of required magnetization technology, carry out modification, and carried out the contrast experiment of wearing and tearing under the actual user mode of 9W18Cr4V twist drill of 8.9 millimeters of diameters according to technology.
The contrast experiment of wearing and tearing under the actual user mode: from not carrying out any processing as reference with taking out 5 10 of the 9W18Cr4V twist drills of 8.9 millimeters of a collection of diameters, remaining 5 are changed to 0 according to modified technique for the field intensity amplitude---2000 oersteds, 35 hertz of frequencies, handled 450 seconds, and then this 10 brill was placed on the contrast of the number of holing in the actual production.Select same machined parameters for use, processing spheroidal graphite cast iron compares as index with the qualified hole count of being processed before the first time sharpening, and the result is as follows:
Without magnetic treatment, on average processing hole count is 1800; Through the magnetic modification, on average processing hole count is 9000, and the raising life-span reaches 4 times more than.
As can be seen, wear resistance obtains very significantly improving after the modification.
Embodiment 3
Present embodiment embodies by cobalt base hard alloy material YG8 being carried out the magnetic modification.
Step 1 is determined frequency: YG8 is made 4 millimeters of diameters, and long 60 millimeters thin rod carries out the measurement at in-fighting peak by multi-functional in-fighting instrument.Under room temperature 20 degrees celsius, the operating frequency that is defined as the magnetic modification is 40 hertz.
Step 2 is determined field intensity: YG8 is processed into 2.85 millimeters of diameters, thick 0.5 millimeter thin slice, put into vibrating sample magnetometer and carry out the measurement of magnetzation curve, can draw when externally-applied magnetic field intensity is 4000 oersteds, its saturation magnetization is 4000 Gausses, so, carry out the magnetic modification add hollow maximum value of magnetic field should be less than 4000 oersteds.
Step 3 is determined modification time: YG8 is made 4 millimeters of diameters, and long 60 millimeters thin rod carries out the measurement of in-fighting value by multi-functional in-fighting instrument.Similar with embodiment 1, record 20 degrees centigrade of temperature, 40 hertz of frequencies, field intensity 0---the magnetic modification time under the 4000 oersted conditions is 600 seconds.
The magnetizing assembly that present embodiment adopts is 0.5 meter of a length, 40 millimeters of internal diameters, and the air core coil of the number of turn 800, power supply large power inverter power source MQ200, outward current magnetizes for 200 amperes.After finishing the determining of required magnetization technology, carry out modification, and carried out abrasive wear contrast experiment before and after the modification according to technology.
Abrasive wear contrast experiment: 6 samples that take off 30 millimeters of diameter 6.24 millimeters long from same block of material, virgin state to these samples is carried out abrasive grain wear test, experiment condition is to add 3.7 kilograms counterweight, on 100# sand paper to the mill, each sample carries out 5 wearing and tearing, and the average single wear weight loss of these 30 times wearing and tearing is 0.00745 gram; Again these samples are carried out the magnetic modification, modified technique is changed to 0 for the field intensity amplitude---4000 oersteds, 40 hertz of frequencies, handled 600 seconds, according to the method described above sample is carried out weightless measurement again, average single wear weight loss is 0.00576 gram, improves wear-out life and reaches 30%.
As can be seen, after the modification wear resistance be improved significantly.
Claims (10)
1. magnetic method of modifying that improves the ferromagnetic metal wear resistance, it is characterized in that: the size and dimension of measuring defined according to the in-fighting value, make specimen, step 1: determine frequency: sample is put into the measurement that the in-fighting instrument carries out in-fighting peak under the normal temperature state, by changing frequency, measure the frequency that takes place under the in-fighting maximum case, this frequency promptly is defined as the operating frequency of magnetic modification; Step 2: determine field intensity: the sample externally-applied magnetic field makes specimen material surpass saturation magnetization, or is measured as by vibrating sample magnetometer and makes its specific magnetising moment required field intensity that reaches capacity, and this field intensity is the work field intensity of magnetic modification; Step 3: determine modification time: by to before the same sample preparation with different accumulative total treatment time situations under the changing conditions of in-fighting value, when the in-fighting value entered mild stage of downcomer, the treatment time of this accumulation was the modification time under the practical situation.
2. the method for raising ferromagnetic metal wear resistance as claimed in claim 1, determine the magnetic field operating frequency by measuring the in-fighting peak, it is characterized in that pairing excited frequency was the magnetic field operating frequency when sample of treated material produced the in-fighting peak value at ambient temperature.
3. the method for raising ferromagnetic metal wear resistance as claimed in claim 1, determine magnetic field work field intensity by the saturation magnetic field intensity of measuring material, it is characterized in that treated material enters the maximum functional field intensity that pairing field intensity of saturation magnetization stage is not more than the magnetic modification at ambient temperature.
4. as the method for claim 1 or 2 or 3 described raising ferromagnetic metal wear resistancies, it is characterized in that said modification time obtains with the change curve that accumulates modification time by measuring same sample in-fighting value.
5. the method for raising ferromagnetic metal wear resistance as claimed in claim 1, determine the magnetic field working hour by measuring the in-fighting value, it is characterized in that, the sample of treated material repeats the processing of same process magnetic modification and the measurement of in-fighting value at ambient temperature, and entering pairing accumulative total magnetic modification time of mild decline stage of in-fighting value is the magnetic field working hour.
6. the method for raising ferromagnetic metal wear resistance as claimed in claim 4, determine the magnetic field working hour by measuring the in-fighting value, it is characterized in that, the sample of treated material repeats the processing of same process magnetic modification and the measurement of in-fighting value at ambient temperature, and entering pairing accumulative total magnetic modification time of mild decline stage of in-fighting value is the magnetic field working hour.
7. the method for raising ferromagnetic metal wear resistance as claimed in claim 1 or 2 is characterized in that, said field frequency scope is: 30 hertz---40 hertz.
8. as the method for claim 1 or 3 described raising ferromagnetic metal wear resistancies, it is characterized in that said magneticstrength scope is: 1000 oersteds---2000 oersteds.
9. as the method for claim 1 or 5 or 6 described raising ferromagnetic metal wear resistancies, it is characterized in that said modification time scope is: 300 seconds---600 seconds.
10. the method for raising ferromagnetic metal wear resistance as claimed in claim 4 is characterized in that, said modification time scope is; 300 seconds---600 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310123441 CN1243110C (en) | 2003-12-29 | 2003-12-29 | Magnetically modifying method for increasing ferro magnetic metal wear resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310123441 CN1243110C (en) | 2003-12-29 | 2003-12-29 | Magnetically modifying method for increasing ferro magnetic metal wear resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1554782A true CN1554782A (en) | 2004-12-15 |
| CN1243110C CN1243110C (en) | 2006-02-22 |
Family
ID=34338871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310123441 Expired - Lifetime CN1243110C (en) | 2003-12-29 | 2003-12-29 | Magnetically modifying method for increasing ferro magnetic metal wear resistance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1243110C (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100449009C (en) * | 2007-04-17 | 2009-01-07 | 武汉晶泰科技有限公司 | Application of electromagnetic field for improving life of metallic material |
| CN100465304C (en) * | 2007-03-21 | 2009-03-04 | 武汉晶泰科技有限公司 | Application of coupled ultrasonic field and electromagnetic field in increasing service life of metal material |
| CN100465305C (en) * | 2007-03-21 | 2009-03-04 | 武汉晶泰科技有限公司 | Method of raising abrasive resistance of metal material |
| CN100489124C (en) * | 2007-04-17 | 2009-05-20 | 武汉晶泰科技有限公司 | Method of increasing wear resistance for metallic material by electromagnetic field |
| CN102922373A (en) * | 2012-11-29 | 2013-02-13 | 武汉理工大学 | Method for improving grinding efficiency of ferromagnetic material |
| CN105206379A (en) * | 2015-10-21 | 2015-12-30 | 武汉理工大学 | Method for reducing specific electrical resistance of ferro-magnetic metal material |
| CN109979707A (en) * | 2019-03-29 | 2019-07-05 | 武汉理工大学 | A kind of method of Electromagnetic Treatment debugging metal works hardness distribution |
| CN112620632A (en) * | 2020-11-30 | 2021-04-09 | 四川大学 | Method for modifying powder metallurgy magnetic material based on pulsed magnetic field |
-
2003
- 2003-12-29 CN CN 200310123441 patent/CN1243110C/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100465304C (en) * | 2007-03-21 | 2009-03-04 | 武汉晶泰科技有限公司 | Application of coupled ultrasonic field and electromagnetic field in increasing service life of metal material |
| CN100465305C (en) * | 2007-03-21 | 2009-03-04 | 武汉晶泰科技有限公司 | Method of raising abrasive resistance of metal material |
| CN100449009C (en) * | 2007-04-17 | 2009-01-07 | 武汉晶泰科技有限公司 | Application of electromagnetic field for improving life of metallic material |
| CN100489124C (en) * | 2007-04-17 | 2009-05-20 | 武汉晶泰科技有限公司 | Method of increasing wear resistance for metallic material by electromagnetic field |
| CN102922373A (en) * | 2012-11-29 | 2013-02-13 | 武汉理工大学 | Method for improving grinding efficiency of ferromagnetic material |
| CN102922373B (en) * | 2012-11-29 | 2015-04-08 | 武汉理工大学 | Method for improving grinding efficiency of ferromagnetic material |
| CN105206379A (en) * | 2015-10-21 | 2015-12-30 | 武汉理工大学 | Method for reducing specific electrical resistance of ferro-magnetic metal material |
| CN109979707A (en) * | 2019-03-29 | 2019-07-05 | 武汉理工大学 | A kind of method of Electromagnetic Treatment debugging metal works hardness distribution |
| CN112620632A (en) * | 2020-11-30 | 2021-04-09 | 四川大学 | Method for modifying powder metallurgy magnetic material based on pulsed magnetic field |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1243110C (en) | 2006-02-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Chen et al. | The influence of strain rate on the microstructure transition of 304 stainless steel | |
| CN1243110C (en) | Magnetically modifying method for increasing ferro magnetic metal wear resistance | |
| Ghahremaninezhad et al. | Deformation and failure in nodular cast iron | |
| Meng et al. | Effects of austempering temperature on strength, ductility and toughness of low-C high-Al/Si carbide-free bainitic steel | |
| Deng et al. | Influence of low-frequency vibrations on the compression behavior and microstructure of T2 copper | |
| Bida et al. | Coercive force measurements in nondestructive testing | |
| Ye et al. | Enhanced surface mechanical properties and microstructure evolution of commercial pure titanium under electropulsing-assisted ultrasonic surface rolling process | |
| Zheng et al. | Structural and microstructural influence on deformation and fracture of dual-phase steels | |
| Spielmannová et al. | Influence of crack orientation on the ductile–brittle behavior in Fe–3 wt.% Si single crystals | |
| Borsato et al. | Influence of solidification defects on the fatigue behaviour of heavy‐section silicon solution–strengthened ferritic ductile cast irons | |
| Yao et al. | Effects of three-dimensional vibration on laser cladding of SS316L alloy | |
| Zhu et al. | Mechanisms and new parameter attribute reduction of high-speed railway wheel rim steel subjected to low temperature fatigue | |
| Levitin et al. | On structural sensibility of work function | |
| Xue et al. | Influence of in-plane simple shear strain on the grain orientation regulation and stretch formability of pre-twinned AZ31 magnesium Alloy sheet | |
| Cai et al. | Evaluation of effect of magnetostriction on residual stress relief by pulsed magnetic treatment | |
| Wu et al. | A micro-mechanism model of residual stress reduction by low frequency alternating magnetic field treatment | |
| CN1182262C (en) | One-way electromagnetic steel plate for low noise transformer | |
| Duan et al. | An Investigation on the Strengthening Mechanism Based on Grain‐Boundary Misorientation of High‐Strength Pipeline Steel | |
| Li et al. | Deformation and anelastic recovery of pure magnesium and AZ31B alloy investigated by AE | |
| Katsumata | Experimental studies of one-dimensional quantum spin systems | |
| Tawara et al. | Defect structure of gold introduced by high-speed deformation | |
| Li et al. | Enhancing strength of nanolaminate 1045 steel prepared by aluminothermic reaction through multiple warm rolling | |
| JP4585101B2 (en) | Low noise transformer electrical steel sheet | |
| Lin et al. | Internal Stress Distribution Model of the Magnetomechanical Hysteresis of Fe-Cr-Al Based Alloys | |
| Fujieda et al. | Magnetostrictive property and magnetic domain structure of Fe-Ga alloy single crystal under tensile strain |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: WUHAN JINGTAI SCIENCE CO., LTD. Free format text: FORMER OWNER: BEIJING HENGTAIHE SCIENCE CO., LTD. Effective date: 20080321 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20080321 Address after: Wuhan economic and Technological Development Zone hi tech park, building 20, 3 floor Patentee after: WUHAN TGS CRYSTAL Ltd. Address before: No. 25, West Third Ring Road, Beijing, Haidian District Patentee before: HENGTAIHE SCIENCE AND TECHNOLO |
|
| C56 | Change in the name or address of the patentee |
Owner name: WUHAN JINGTAI LIMITED COMPANY Free format text: FORMER NAME: WUHAN TGS CRYSTAL LIMITED |
|
| CP03 | Change of name, title or address |
Address after: 430056 No. 266 Taizi Lake Road, Wuhan economic and Technological Development Zone, Hubei Patentee after: WUHAN JINGTAI TECHNOLOGY CO.,LTD. Address before: 430000, Hubei economic and Technological Development Zone, Wuhan hi tech park, building 20, 3 floor Patentee before: WUHAN TGS CRYSTAL Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20060222 |
|
| CX01 | Expiry of patent term |