CN104551998B - Special grinding liquid efficiency evaluation method - Google Patents
Special grinding liquid efficiency evaluation method Download PDFInfo
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- CN104551998B CN104551998B CN201410806243.4A CN201410806243A CN104551998B CN 104551998 B CN104551998 B CN 104551998B CN 201410806243 A CN201410806243 A CN 201410806243A CN 104551998 B CN104551998 B CN 104551998B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
Abstract
The invention provides a grinding liquid efficiency evaluation method, and belongs to the field of grinding liquid efficiency evaluation. The grinding liquid efficiency evaluation method is characterized by comprising the following steps of separating a curve of grinding wheel material removal rate into three phases according to the change rule, namely a primary passivating phase, a stable passivating phase and a sudden passivating phase; before the stable passivating phase, separating a grinding wheel primary processing technology into two phases, namely grinding and calibration; using a grinding wheel sharp grinding method for grinding, namely that a grinding wheel which is fixedly arranged on a grinding machine worktable is ground so as to perform the sharp grinding of a diamond grinding wheel; when a silicon carbide grinding wheel is used as a sharp grinding material, as ceramic is used as a grinding wheel calibration material, performing the same group of calibration tests on a specimen; using the grinding parameters same as the actual test parameters, and pre-grinding the specimen until the stable passivating phase is entered; specifying two standards for judging the completing of the pre-grinding, namely that the grinding wheel passivating exceeds the initial passivating phase; the single grinding time of the grinding wheel in the same group of tests during terminating is the same. The grinding liquid efficiency evaluation method has the advantage the evaluation accuracy of grinding liquid is greatly improved.
Description
Technical field
The invention belongs to field evaluated by grinding fluid.
Background technology
Ceramic material has very excellent mechanical performance, and the application in engineering just constantly expands.But by
Make the processing method that grinding becomes its main flow in the high rigidity of ceramic material and fragility.Because grinding speed is high, send out
Heat is big, and grinding temperature is high, easily produces face crack because of the effect of thermal stress in the course of processing, and abrasion of grinding wheel is passivated,
The phenomenons such as Grain Falling Off.Abrasive dust caulked also can result in blockage in emery wheel chip space makes emery wheel lose grinding capacity.In order to drop
Low grinding temperature, rinses out abrasive dust and emery wheel end, improves grinding ratio and workpiece surface quality it is necessary to adopt high performance grinding fluid
To ensure being smoothed out of ceramic grinding process.But for metal material, ceramic material development time is shorter, and material
The physical and chemical performance of material is different so that the specific aim that during current ceramic grinding, grinding fluid uses is very poor, and application effect is not
Good, significantly constrain the realization of ceramic high-efficiency technical process.Therefore, targetedly developing ceramic special grinding fluid becomes pottery
One of manufacture field research worker hot issue of interest.
In grinding fluid research, most of achievements all concentrate on and improve greasy property in grinding process, reduce grinding temperature
In field, to guarantee being smoothed out of grinding process.But grinding fluid is actually considered as a kind of aid by this research, and
Ignore the tremendous influence to final grinding result for the grinding fluid.Under this research mode, the lifting of independent performance does not guarantee that mill
Cut the excellent of result.Be based on this present situation, some research worker from practical angle, with the first kind performance of grinding fluid
I.e. grinding result is investigating the quality of grinding fluid.And for difficult-to-machine material, grinding fluid is to material removing rate and processing energy
The impact of power is undoubtedly research worker emphasis direction of interest.Realize this target, constant force test is a kind of FA
Research technique, its basic thought is that as reference, constant grinding force is investigated the impact to the course of processing for the various grinding fluids.
This method the most directly applies the various performances being exactly to investigate grinding fluid by the large batch of grinding of constant force grinding machine.As material
Clearance, wheel loading rate and workpiece surface quality.For example, American scholar is developing Long carbon chain alcohol grinding fluid to silicon nitride ceramics
Impact with hard-alloy grinding process just employs this method.The method is very accurate to the final evaluation of grinding fluid of shaping
Really reliable.But deficiency is that the quantity of the required grinding fluid of investigation and workpiece every time is very big, and this is past for grinding fluid development process
Past and inapplicable.Therefore, in grinding fluid research process, research worker also tends to designed, designed simultaneously and develops the force mechanisms such as various
Complete to test.For example, American scholar a kind of perseverance of drive with regard to self-developing when investigating the halogenated hydrocarbons special grinding fluid of pottery
Force mechanisms, grinding fluid carries out grinding fluid evaluation using the method for dipping.Yasuoyamanaka et al. proposes one kind and puts one on ring
The device of test block, for evaluating the characteristic of grinding fluid in laboratory conditions and introducing on several publications and discuss this
It is used for studying the instrument of grinding.The Ge Peiqi of Northeastern University also develop a kind of compact constant force mechanisms and with common plane grinding machine
Coupling uses, and because grinding is carried out still on general-purpose grinder, therefore process of the test is very close to actual grinding process.
These test methods only using grinding fluid function as grinding output result an immanent cause, and be not re-used as lead
The evaluation criterion wanted, therefore can break away from its uncertainty to application effect appraisal, and then is hopeful more to be sticked on
The evaluation of nearly practical application effect.But at present in the only fragmentary development process coming across some grinding fluids of this method, not
The application regularity and methods for using them of each key element during exploratory experiment methodically, limits them in different field grinding
Widely used in liquid evaluation.
Content of the invention
The present invention is to attempt systematically setting up grinding based on the constant force mechanisms of design during the research of early stage grinding fluid
Liquid evaluation methodology.The special grinding fluid being far below metal material especially for material homogeneities such as potteries provides evaluation methodology.
Grinding fluid efficiency rating method it is characterised in that:
Curve is divided into three phases: i.e. passivation stage at initial stage, stable passivation according to Changing Pattern by emery wheel material clearance
Stage and drastically passivation stage；
Stably it is passivated the test data y in stage1,y2,y3,y4,y5,……yn, for waiting ratio relation, used by n-th grinding
Grinding time ynWith formula:
yn=y1×kn-1=y2×kn-2=...=yn-1×k (1)
To describe, wherein n represents grinding number of times；；
In formula, ynRepresentative experienced the degree of passivation of emery wheel after n grinding, y1Represent entering of emery wheel initial during grinding
Degree of passivation, and k is referred to as the passivation speed of emery wheel, represents the passivation speed being entirely stably passivated stage emery wheel；Passivation speed k
There is under a certain working environment uniqueness and obtained by numerous data institute's matchings, evaluate grinding fluid with passivation speed k
Efficiency；
Enter the emery wheel initial stage handling process stablized before the passivation stage and be divided into two stages: reconditioning and demarcation；
(1) method that reconditioning uses emery wheel dressing, is fixed on emery wheel on Grinder bench Lai real by grinding
The dressing work of cash diamond grinding wheel；When silicon carbide grinding wheel is as dressing material,
(2) selection of calibration sample
When material is demarcated as emery wheel due to pottery, same sample need to be limited to the rating test of group test enterprising
OK；Such restriction is not needed for metal material；
(3) pre-grinding is processed
Stably it is passivated rank using carrying out grinding in advance with actual tests parameter identical grinding parameter and sample until entering
Section；It is that wheel loading crosses the primary passive stage that pre-grinding process the criterion completing to have two: one；Two is to organize examination together when terminating
Test the medium plain emery wheel single grinding time identical.
Further, must carry out to ensure grinding fluid under consistent grinding force and grinding depth with the contrast of battery of tests
The concordance of experimental condition；For matched curve, in test, the needs of normal wearing stage test data control at 10-15.
Concrete control method is to adjust to increase grinding force and grinding depth.For example when load 0.5kg grinding depth is 0.1mm,
The number of times that abrasive grinding wheel completes the stable passivation stage is 8 times, then the method improving experiment number has two, and one is to lower to carry
Lotus；Two are to increase grinding depth.Therefore load or grinding depth can be adjusted to 0.45kg or 0.15mm.Grinding number of times after adjustment
Will be above 8 times, experimental result contrast final goal is contrasted for 10-15 time, then adjusts accordingly according to experiment number
This parameter is can be utilized to carry out testing until reaching target experiment number.
The present invention particular note is that and embodiments provides a kind of special evaluation system of grinding fluid efficiency, but
For existing grinding fluid efficiency, special evaluation can be suitable for method.Such as in background technology mentioned system.Only Shen
Ask someone to think that the system being embodied as with the present invention can be more more accurate.
Brief description
Fig. 1 embodiment of the present invention system schematic
1 reconditioning block, 2 slide rails, 3 slide blocks, 4 object stages, 5 test specimens, 6 emery wheels, 7 hose supports, 8 flow controllers, 9 cast are soft
Pipe, 10 pulleys, 11 load, 12 limited blocks, 13 magnetic suction discs
Wheel loading curve under the conditions of Fig. 2 constant force griding
The different grinding fluid full inaction period grinding efficiency comparison diagram of two kinds of Fig. 3
Relation between Fig. 4 grinding depth and deactivation rate
Relation between Fig. 5 grinding force and deactivation rate
Specific embodiment
Illustrate the application of the present invention below in conjunction with accompanying drawing.
The special evaluation system of grinding fluid efficiency, including constant force griding mechanism, constant force griding mechanism includes line slideway, straight line
Guide rail both sides limited location block, has slide block above line slideway, object stage is fixed on straight-line guide rail slide block, and test specimen is fixed on loading
On platform, one end of object stage connects load by pulley；It is characterized in that:
Line slideway prestressing force need to adjust to below 0.05kg through special tuning；
Slot trimming mechanism selects the silicon carbide grinding wheel being placed in limited block top as grinding tool, silicon carbide grinding wheel highest point
Consistent with test specimen overhead height；
Also include bracing frame: bracing frame is fixed on grinding wheel guard with the movement of emery wheel and synchronizing moving；It is straight
Footpath is more than the diameter 10-20mm of emery wheel, and width is more than grinding wheel width 5-10mm；
Cast flexible pipe is supported by support, and is close to emery wheel placement, and end shape will be coincide with wheel face；Cast hose end
Portion's shape forming method is contact emery wheel, is formed by wheel grinding；Flow regulator is arranged on above cast flexible pipe.
Test mechanism is mainly made up of surface grinding machine, line slideway, object stage, slot trimming mechanism and running gate system, and its institute is real
Existing function mainly has: the cast of constant force griding, reconditioning and grinding fluid.
Constant force griding: constant force griding part includes line slideway, wherein line slideway and counterweight and is mainly used to realize workpiece
Move along a straight line and control the size of grinding force, its maximum feature is to be not required to transform grinding machine and result of the test is close to flat stone mill
Cut.In grinding process, workbench is motionless and workpiece is for linear motion along guide rail.
Constant force griding mechanism mainly includes 4 parts.
(1) constant force mechanisms: constant force mechanisms are realized being the core component of constant force griding, it selects and application need to meet following wanting
Ask: one, ball centre of sphere distance in guide rail both sides is more than or equal to more than 2 times of grinding specimen width.And the bearing both sides ball center of circle
Spacing is more than 30mm, with the stability during guarantee test.2nd, for coefficient of friction difference when excluding kinematics and static friction conversion
Impact to test, guide rail prestressing force need to be checked through special, adjusts to below 0.05kg.This point is for the accuracy of test
It is critical that.When the 3rd, installing test specimen, its position needs on center line of guide rail, to ensure to be subject in test specimen grinding process
Dynamic balance.Above-mentioned requirements are most important to the accuracy of result of the test, indispensable.
(2) object stage: line slideway cunning is fastened on by screw in order to simplify the flat board that structure object stage is a 5mm thickness
On block, test specimen is fixed on object stage using the method for glue bonding.This method for the clamping of the non-magnetic materials such as pottery is
Very easily.
(3) pulley: pulley is by being fixed on the base supports of surface grinding machine work edge of table, its peak and object stage etc.
High.Main Function is the power transmission realized between load and object stage.
(4) load: load is connected on object stage through pulley by cord, its size is to control wheel loading speed
Key issue.Test method part is shown in concrete calculating and selection.
Slot trimming mechanism: under the conditions of the sharp keen starting point of identical emery wheel, investigating grinding fluid performance in full inaction period is that mechanism is commented
One of important symbol of valency.In order to ensure that testing initial emery wheel every time has approximate sharp keen degree, test mechanism incorporates gold
The reconditioning unit of diamond grinding wheel.Through different grinding methods to when testing, mechanism selects and is placed in metal buting iron top
, as grinding tool, it is highly consistent with test specimen overhead height for silicon carbide grinding wheel, to facilitate reconditioning process it is ensured that crucial in test
A ring.Concrete grinding method is shown in test method.
Running gate system: it is impossible to prepare in a large number to every kind of liquid in grinding fluid R＆D process.And the shadow due to airbond
Ring, low discharge cast then cannot make grinding fluid substantially arrive in grinding arc area, the accurate evaluation of impact grinding fluid.In order to solve this
Individual problem, this running gate system is mainly made up of three parts.
(1) bracing frame: bracing frame is fixed on grinding wheel guard with the movement of emery wheel and synchronizing moving.It is shaped as directly
Footpath is slightly larger than the circular arc of emery wheel, and width is slightly larger than grinding wheel width.Require during placement to press close to emery wheel as far as possible, its effect is except supporting
May also operate as the effect of air-flow scraper plate outside cast flexible pipe, improve grinding fluid cast environment.
(2) pour into a mould flexible pipe: cast flexible pipe supported by support, and press close to emery wheel place, through wheel grinding make its shape with
Wheel face coincide.Due to grinding rear hose directly contact emery wheel, therefore can be very good to shield airbond when low discharge is poured into a mould
Effect, so that grinding fluid is substantially arrived in grinding arc area.
(3) it is flow controller.Flow regulator is arranged on above flexible pipe, and this device is mainly adjusted by the big of caliber
Little controlling cast flow velocity, to detect relative influence.
The impact that 3.1 wheel loading processes are evaluated to grinding efficiency
Material removing rate is that constant force griding tests most widely used experimental index.Its main thought is constant force griding bar
Under part, the big of grinding efficiency is evaluated with the time that the volume or removal equivalent volumes removing material in the unit interval is spent
Little.But through substantial amounts of literature search it is found that ignoring wheel loading to experimental result in most constant force tests at present
Impact.Therefore, different mechanisms is tested in a variety of ways, result often differs several times even more than ten times.Example
As, the evaluation grinding efficiency that aforementioned halogenated hydrocarbons grinding fluid is carried out on its independently developed constant force mechanisms improves 2～3 times, and
In the experiment that follow-up similar Alcohols grinding fluid is carried out on constant force grinding machine, their grinding efficiency improve only
33%.Numercal greatest differences but can not illustrate that the former provides up to nearly ten times of working (machining) efficiency than the latter.
In order to grinding fluid of the same race is carried out under pouring condition, with skive to silicon nitride on above-mentioned constant force test mechanism
Pottery carries out grinding test.The grinding depth that test adopts is 0.1mm, and each material removal amount is 64 × 8 × 0.1=
51.2mm3.After emery wheel reconditioning, test starts from the sharp keen state of emery wheel and constantly repeats up to wheel loading.Pass through
Record each grinding time, can get the change curve of emery wheel material removing rate in whole inaction period, such as Fig. 2:
Easily find from Fig. 2, an emery wheel material clearance actually process being continually changing, and according to change rule
Curve can be divided into three phases by rule: i.e. the initial stage is passivated the stage, is stably passivated the stage and is drastically passivated the stage.Using Fig. 2 as
Basis, the different grinding efficiency in whole inaction period for the grinding fluid of contrast can be very good the reason explain above-mentioned difference.Right
More as shown in Figure 3 than scheming.(after hypothesis reconditioning, the initial cut ability of emery wheel or degree of passivation are consistent):
From in figure it will be seen that such as we are compared the time period of selection of small, then can go out in different phase
The one of existing different results, such as in figure, two, near 3 points compared with the contrast of minizone.When near first point, due to both grindings
When emery wheel all in relatively sharp state, result of the test is more or less the same it is difficult to both difference are described.Contrast at second point
Although both are actually a variable all in stable passivation stage, the comparing result in this stage.Emery wheel is more blunt, both
Ratio is bigger.Contrast grinding fluid one thirdly is already at being drastically passivated the stage, and grinding fluid two is still within stable passivation
Stage, such contrast will obtain very big ratio, loses practical significance.Exceed and thirdly carry out contrasting, it is unlimited to obtain
Big value.The uncertainty of this control methods illustrates that efficiency rating result of the test differs very both at home and abroad at present to a certain extent
Big the reason.Even if, by improving the accuracy of grinding efficiency evaluation from the larger time period, its grinding process is still for we
The result in different passivation stages can be comprised, experimental precision is still limited.
The main cause producing this phenomenon is as the continuous growth of wheel loading degree, and the material of certain time period goes
Except rate is actually a variable and also variant in each passivation phasic change speed.Therefore, do not consider wheel loading and
The material removing rate obtaining can cause very big error.
3.2 grinding fluid evaluation indexes and application process are inquired into
3.2.1 the establishment of evaluation index
In Fig. 2, the stage that is stably passivated occupies most of normal grinding time, is also the main of experience in actual grinding process
The Performance Properties Evaluation of part, therefore grinding fluid should be carried out in this stage.
If experimental data is set ynFor it was found that the test data y of second segment1,y2,y3,y4,y5,……yn, approximately
For waiting ratio relation, therefore, the grinding time y used by n-th grindingnAvailable formula:
yn=y1×kn-1=y2×kn-2=...=yn-1×k (1)
To describe, wherein n=1,2,3,4 ... n.
In formula, ynRepresentative experienced the degree of passivation of emery wheel after n grinding, y1The normal grinding of entrance of emery wheel can be represented
When primary passive degree, and k can be referred to as the deactivation rate of emery wheel, represents the passivation speed of entirely stably passivation stage emery wheel
Degree.Because passivation speed k has uniqueness under a certain working environment and is obtained by numerous data institute's matchings, can relatively fill
Divide the impact to experiment for the index fluctuation in ground reflection grinding process, be the grinding fluid preferable reference index of evaluation.
3.2.2 the implementation method of the initial sharp keen state consistency of emery wheel
When this method is evaluated to grinding fluid maximum feature be preferable emery wheel original state be so that emery wheel is being evaluated
During be in consistent sharp keen degree all the time.But constantly wear and tear and blunt because skive is one in grinding process
The process changed, and calibration process also results in wheel loading in itself so that the initial condition of strict conformance is in actual mechanical process
In become a necessity but relatively difficult to achieve condition.In order to realize above-mentioned target, emery wheel initial stage handling process is mainly divided
For two stages: reconditioning and demarcation.
(1) selection of grinding method and emery wheel material
At present the main method of skive reconditioning is had to grinding, carries out dressing using mild steel or plain wheel.Mill
The method cut needs to take off emery wheel from grinding machine, is repaired by the method for grinding, and this method precision and efficiency are relatively
Height, but have certain limitation for this method of experimentation that most of experiment conditions are limited and emery wheel cannot take off.
Mild steel is relative with the application of the dressing materials such as plain wheel flexibly not to be needed to carry out the dismantlement work of emery wheel, but form accuracy and effect
Rate is relatively low.In view of the feasibility of test, the method that this test mechanism uses emery wheel dressing, fixed by grinding
The dressing work of skive to be realized by emery wheel on Grinder bench.Experiment compares several dressing materials and finds, carbon
When SiClx emery wheel is as dressing material, the sharp keen degree of skive is slowly increased with the time increase of dressing, permissible
Easily control the sharp keen degree of emery wheel, be ideal dressing material.
(2) selection of calibration sample
Due to the poor material of the physical chemistry uniformity such as pottery itself, to demarcating accuracy, fixing sound is larger really, because
This, if demarcate material using this kind of material as emery wheel, the rating test with group test need to be limited to approximate same of performance
Article one, sample is carried out, to improve the accuracy that sharp keen degree demarcated by emery wheel.And the material for even tissue such as metal materials
Material property and the close material of condition of heat treatment can be selected to be interchangeable use.
(3) pre-grinding is processed
Testing surface, after reconditioning still can there is certain difference in the sharp keen degree of emery wheel, and pre- ground is to realize further
With a group experiment medium plain emery wheel initially sharp keen degree approximately crucial ring.
Grinding parameter (including grinding force, grinding depth and emery wheel parameter etc.) and sample carry out grinding in advance.Terminal
It is that wheel loading crosses the primary passive stage that criterion has two: one；Two is with during the group test last grinding of medium plain emery wheel
Between error be less than 5%.
yn=y1×kn-1=y2×kn-2=...=yn-1×k
, this kind of material first is passivated the about 25 seconds single maximum grinding time in stage, therefore single grinding taking Fig. 2 as a example
Can consider when time was more than 25 seconds and enter the stable passivation stage, meet first condition.And in testing when two groups, single
Less than 1 second (4%), grinding time difference then thought that the sharp keen degree of emery wheel is approximate, reached the initial condition of grinding fluid evaluation,
Respectively different grinding fluids can be evaluated.
It is to make emery wheel complete the passivation stage at initial stage that the purposes that pre-grinding is processed mainly has two: one, excludes this stage emery wheel mistake
Fast passivation and latter stage in stage passivation speed are mutated the impact that experiment is caused；Two be by control pre- grinding number of times number make sand
Wheel obtains different initial stage passivating process, to compensate the difference of the sharp keen degree of reconditioning process medium plain emery wheel, obtains consistent emery wheel and rises
Beginning state.
Wear of diamond wheel form mainly has abrasion of grinding wheel, wheel topography and grinding wheel shape distortion etc..Wherein, emery wheel mill
Damage and the impact to emery wheel for the wheel topography mainly makes wheel loading thus losing grinding capacity, and grinding wheel shape distortion then can increase
Plus the actual contact length of emery wheel.Because, in experimentation, skive distortion level is less, with respect to abrasion and passivation
Impact can be ignored relatively, and the emery wheel reconditioning in experiment is mainly dressing technique, and after making experiment, the sharp of emery wheel is restored.
But it should be noted that dressing process can not produce excessive shape distortion phenomenon.
3.2.3 the test number (TN) control method based on grinding force and grinding depth
Evaluate wheel loading process, suitable test evaluation point number for Control experiment degree of accuracy and experiment work amount is
Very important.It is that constant force griding test is fed in grinding process surely for process of the test, the mill of grinding depth and generation
The power of cutting is two directly related parameters.Increase the corresponding growth that grinding depth then necessarily leads to grinding force.This test adopts
It is constant force griding, therefore increase the growth that grinding depth will lead to each grinding time.Because the growth of Grinding length is relative
It is not constant proportionate relationship it is therefore necessary to impact in test is discussed to both in different grinding depths.This
Section is tested using different grinding depths and grinding force, explores this affecting laws to grinding efficiency for two key factors.
Five groups of data that grinding depth test is respectively adopted between 0.02～0.2mm are tested.Experimental result is as follows:
Table 1 deactivation rate and Grinding length are the relation of grinding depth
| Grinding depth mm | 0.02 | 0.05 | 0.1 | 0.15 | 0.2 |
| Grinding length mm | 2.24 | 3.53 | 5 | 6.1 | 7.1 |
| Deactivation rate | 1.0006 | 1.029 | 1.156 | 1.62 | 2.44 |
From Fig. 4 and Biao 1, we are readily seen the increase with grinding depth, and wheel loading rate also increases.But increase
Not fully according to the increase of contact arc length or grinding depth, ratio increases long amplitude.The main cause producing this phenomenon is
Etc. the growth of Grinding length under the conditions of power, abrasive particle is reduced with respect to workpiece pressure, thus be difficult to cut workpiece forming abrasive dust.
Additionally, the change of tangential and normal force ratio caused by the Angulation changes of grinding surface and Grinding length increase brought grinding ring
The change in border all may make its generational verctor.Due to not being the centre point of this patent, only grasp universal law here to test
Impact, its formation mechanism is no longer discussed further.
The change of grinding force we mainly adopt 0.75kg and 1.25kg both load, reconditioning demarcate after carry out contrast examination
Test, its result is as follows:
Fig. 5 curve moves towards clearly, and the increase of grinding force can greatly reduce the deactivation rate of emery wheel.That is,
After a kind of load-up condition is issued to the drastically passivation stage, might not be also into drastically passivation rank under bigger load-up condition
Section.
Two groups of tests have certain directive significance to grinding fluid efficiency rating method above.First, wheel loading rate is with mill
Cut the increase of depth and increase, but reduce with the increase of grinding force.Therefore, the contrast with battery of tests must be consistent
Carry out under grinding force and grinding depth to ensure the concordance of grinding fluid experimental condition, otherwise will be unable to accurately be tested knot
Really.Secondly, for accurate matched curve, in test, the needs of normal wearing stage test data control at ten about.Very little
The accuracy of meeting influence curve matching, then the test period is longer too much.According to this rule, we can by adjust load or
The method of person's grinding depth is adjusting the size of deactivation rate, and then controls the length of whole test period.Due to every kind of reagent
Investigation the spent time carrying out full inaction period is relatively long, and the minimizing of every group of test period is conducive to expanding test face
With by repeating to test the accuracy of the result.
3.2.4 the conversion method of wheel loading rate and material removing rate
Because deactivation rate k represents the change procedure of grinding efficiency in whole grinding process, and theoretically see and sand
The contrast of wheel passivating process is zero deflection contrast, and therefore test accuracy will be far above only investigation certain point or the material in a certain stage
Material clearance.Need the material removing rate of sometime emery wheel is investigated as certain, can be obtained by simple calculating
Arrive.Its computational methods is as follows.
(1) after grinding same number, the material removing rate of emery wheel contrasts
If emery wheel primary passive situation is unanimously y during grinding1, then grinding certain volume material v or through certain grinding
After number of times, emery wheel grinding unit volume material required time y this momentnFor
yn=y1×kn-1(2)
Then we can obtain emery wheel material removing rate this moment and are:
λPoint=vSecondary/yn(3)
Wherein n is the number of times needed for the certain material of grinding, available formula:
N=vAlways/vSecondary
Calculate.Wherein vAlwaysIt is all material volume of required removal；vSecondaryThe material volume that can remove for each grinding.
(2) emery wheel average material clearance contrast after grinding same number
The average material clearance of certain environment lower grinding wheel can be with total removing material volume divided by total grinding time
Calculate, computational methods are as follows:
Using this two formula, as long as we pass through test obtains the deactivation rate of emery wheel it is possible to easily calculate grinding
During, the material removing rate of a certain moment or certain time period.It should be noted that the result that the method is calculated is that have partially
Difference is evaluated, and its deviation size is inversely proportional to the length of the time of investigation.
Claims (2)
1. grinding fluid efficiency rating method it is characterised in that:
Curve is divided into three phases: i.e. passivation stage at initial stage, stably passivation stage according to Changing Pattern by emery wheel material clearance
Drastically it is passivated the stage；
Stably it is passivated the test data y in stage1,y2,y3,y4,y5,……ynFor waiting ratio relation, the grinding used by n-th grinding
Timey nWith formula:
yn=y1×kn-1=y2×kn-2=...=yn-1× k (1)
To describe, wherein n represents grinding number of times；
In formula,y nRepresentative experienced the degree of passivation of emery wheel after n grinding, y1Represent the primary passive entering during grinding of emery wheel
Degree, andkIt is referred to as the passivation speed of emery wheel, represent the passivation speed being entirely stably passivated stage emery wheel；Passivation speedk?
There is under a certain working environment uniqueness and obtained by numerous data institute's matchings, use passivation speedkTo evaluate grinding fluid effect
Rate；
Enter the emery wheel initial stage handling process stablized before the passivation stage and be divided into two stages: reconditioning and demarcation；
(1) method that reconditioning uses emery wheel dressing, the emery wheel being fixed on Grinder bench by grinding is realizing gold
The dressing work of diamond grinding wheel；Silicon carbide grinding wheel is as dressing material；
(2) selection of calibration sample
When material is demarcated as emery wheel due to pottery, need to be limited to the rating test of group test and carry out on same sample；Right
Do not need such restriction in metal material；
(3) pre-grinding is processed
Stably it is passivated the stage using carrying out grinding in advance with actual tests parameter identical grinding parameter and sample up to entrance；In advance
It is that wheel loading crosses the primary passive stage that mill process the criterion completing to have two: one；Two is with group test when terminating
The emery wheel single grinding time is identical.
2. grinding fluid efficiency rating method according to claim 1 it is characterised in that:
Contrast with battery of tests must be carried out to ensure grinding fluid experimental condition under consistent grinding force and grinding depth
Concordance；For matched curve, in test, normal wearing stage test data needs to control at 10-15.
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| CN201410806243.4A CN104551998B (en) | 2014-12-21 | 2014-12-21 | Special grinding liquid efficiency evaluation method |
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| CN104551998B true CN104551998B (en) | 2017-01-18 |
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| JP5034427B2 (en) * | 2006-10-12 | 2012-09-26 | 株式会社ジェイテクト | Method for releasing dynamic pressure of grinding fluid in grinding, grinding method using the method, and grinding wheel used in the grinding method |
| CN102928337B (en) * | 2012-11-06 | 2015-04-08 | 东华大学 | Device and method for analysis and test of high-speed grinding characteristic of rotary part |
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