CN108829920B - Model and method for evaluating induction brazing temperature of superhard abrasive grinding wheel - Google Patents

Model and method for evaluating induction brazing temperature of superhard abrasive grinding wheel Download PDF

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CN108829920B
CN108829920B CN201810413870.XA CN201810413870A CN108829920B CN 108829920 B CN108829920 B CN 108829920B CN 201810413870 A CN201810413870 A CN 201810413870A CN 108829920 B CN108829920 B CN 108829920B
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grinding
grinding wheel
induction brazing
brazing temperature
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李奇林
丁凯
雷卫宁
任慧中
茆宁
钱建兵
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Jiangsu University of Technology
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Abstract

The invention relates to an evaluation model and method of superhard abrasive grinding wheel induction brazing temperature in particular; the technical problem to be solved is as follows: providing an evaluation model and method for obtaining the induction brazing temperature of the superabrasive grinding wheel within the brazing temperature range; the technical scheme is as follows: a superhard abrasive grinding wheel induction brazing temperature evaluation model and method comprises the following steps: at several temperatures (T) at equal intervals0……Tn) Preparing a plurality of groups of single-layer brazing superhard abrasive grinding wheel samples by an induction brazing method; carrying out a wear test on each group of grinding wheel samples under the condition of constant grinding dosage until the samples fail; calculating the total removal quantity Q of the workpiece material of each group of grinding wheels through the grinding parameters and the grinding strokeT(ii) a Taking the electroplated grinding wheel as a reference group to obtain an evaluation index f (Ep), and obtaining an induction brazing temperature interval meeting the grinding requirement by selecting a proper correction coefficient K (between 1.3 and 2) and taking F (T) being not less than K f (Ep) as an evaluation function of the induction brazing temperature T; the invention is applicable to the field of brazing.

Description

Model and method for evaluating induction brazing temperature of superhard abrasive grinding wheel
Technical Field
The invention belongs to the technical field of superhard abrasive grinding wheels, and particularly relates to an evaluation model and method for the induction brazing temperature of the superhard abrasive grinding wheel.
Background
Research in recent decades shows that the single-layer brazing superhard abrasive grinding wheel can realize chemical bonding between a bonding agent (brazing filler metal) and abrasive particles, has advantages in the aspects of abrasive holding strength, machining efficiency, grinding wheel service life and the like, is considered as a replacement product of the current electroplating tool, and has wide application prospects in the field of efficient grinding of difficult-to-machine materials.
The induction brazing can control the deformation of the grinding wheel base body in a local heating mode, and has obvious advantages in the aspect of improving the precision of the brazing grinding wheel. So far, scholars at home and abroad have conducted extensive research on superabrasive induction brazing, for example, Chattopadhyay a K and the like, marbojiang and the like successively adopt induction brazing to prepare a single-layer superabrasive grinding wheel, and the single-layer superabrasive grinding wheel shows good grinding performance in tests. In these studies, the brazing pool was generally treated as a uniform temperature field, and only the brazing quality was studied for several temperature values. However, the influence factors of the induction heating temperature are more, the action mechanism of the induction heating temperature is more complex, so that the absolute uniformity of the temperature field in the molten pool under the induction brazing condition is difficult to realize, and particularly, when the forming surface is heated, the phenomenon of uneven temperature of the forming surface along the profile direction is more obvious under the influence of a sharp angle effect and an edge effect.
Disclosure of Invention
The invention overcomes the defects of the prior art, and solves the technical problems that: provides an evaluation model and method for obtaining the induction brazing temperature of the superabrasive grinding wheel within the brazing temperature range.
In order to solve the technical problems, the invention adopts the technical scheme that: a superhard abrasive grinding wheel induction brazing temperature evaluation model and method comprises the following steps:
s101, several temperatures (T) at equal intervals0……Tn) Preparing a plurality of groups of single-layer brazing superhard abrasive grinding wheel samples by an induction brazing method;
s102, carrying out a wear test on each group of grinding wheel samples under the condition of constant grinding dosage until the grinding wheel samples fail;
s103, calculating the total removal amount Q of the workpiece materials of each group of grinding wheels through the grinding parameters and the grinding strokeT：
QT＝ap·len·w·P (1)
In the formula: a ispFor cutting depth, len is the length of the workpiece, w is the width of the workpiece, and P is the total number of grinding strokes when the grinding wheel fails;
s104, the comprehensive index model for evaluating the induction brazing temperature is as follows:
g(T)＝KF/FT+KQ·QT (2)
in the formula: g (T) is a temperature evaluation index, KF、KQRespectively initial normal grinding force FTAnd total amount of workpiece material removed QTThe evaluation indexes at all temperatures are interpolated by cubic splines to obtain a function F (T);
s105, taking the electroplated grinding wheel as a reference group to obtain an evaluation index g (Ep), and obtaining an induction brazing temperature interval meeting the grinding requirement by selecting a proper correction coefficient K, wherein K is between 1.3 and 2, and F (T) is more than or equal to Kg (Ep) as an evaluation function of the induction brazing temperature T.
Preferably, in step S102, the definition criteria of the failure are: calculating the grinding force ratio F during grinding according to the grinding force measured in real timen/FtI.e., the normal to tangential force ratio of the workpiece, the failure criterion is reached when the force ratio is gradually increased to 2.5 times the initial force ratio.
Preferably, said KFThe value range of (a) is 2000-8000.
Preferably, said KQThe value range of (A) is 0.2-0.8.
Compared with the prior art, the invention has the following beneficial effects:
the model and the method for evaluating the induction brazing temperature of the superhard abrasive grinding wheel can quantitatively give the temperature range of a molten pool for induction brazing, so that the strength and the grinding performance of a joint can meet the use requirements; the model comprehensively evaluates the performances of the sharpness of the grinding wheel and the service life of the grinding wheel by taking the brazing temperature as an independent variable, thereby obtaining the brazing temperature range meeting the requirement of the grinding performance, adopts induction brazing to prepare a plurality of groups of single-layer brazing superhard abrasive grinding wheels under a series of temperature conditions, respectively represents the sharpness of the grinding wheel and the service life of the grinding wheel by the grinding force and the total material removal amount obtained by a grinding test, finally takes the single-layer electroplating superhard abrasive grinding wheel as a control group, quantitatively gives the temperature range of a molten pool of the induction brazing through an established evaluation function, thereby ensuring that the joint strength and the grinding performance meet the use requirement, and providing evaluation basis for optimizing the induction brazing temperature control of the superhard abrasive grinding wheel.
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The present invention will be described in further detail with reference to the accompanying drawings;
FIG. 1 is a schematic structural view of a grinding test apparatus according to the present invention;
wherein: 1 is a clamp, 2 is a titanium alloy workpiece, 3 is a grinding wheel, and 4 is CBN abrasive particles.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments, but not all embodiments, of the present invention; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
a superhard abrasive grinding wheel induction brazing temperature evaluation model and method comprises the following steps:
s101, several temperatures (T) at equal intervals0……Tn) Preparing a plurality of groups of single-layer brazing superhard abrasive grinding wheel samples by an induction brazing method;
s102, carrying out a wear test on each group of grinding wheel samples under the condition of constant grinding dosage until the grinding wheel samples fail; the definition criteria of the failure are as follows: calculating the grinding force ratio F during grinding according to the grinding force measured in real timen/FtI.e. the ratio of normal force to tangential force of the workpiece, the failure criterion is reached when the force ratio is gradually increased to 2.5 times the initial force ratio;
s103, calculating the total removal amount Q of the workpiece materials of each group of grinding wheels through the grinding parameters and the grinding strokeT：
QT＝ap·len·w·P (1)
In the formula: a ispFor cutting depth, len is the length of the workpiece, w is the width of the workpiece, and P is the total number of grinding strokes when the grinding wheel fails;
s104, the comprehensive index model for evaluating the induction brazing temperature is as follows:
g(T)＝KF/FT+KQ·QT (2)
in the formula: g (T) is a temperature evaluation index, KF、KQRespectively initial normal grinding force FTAnd total amount of workpiece material removed QTThe larger the value of the evaluation function g (T), the better the grinding performance of the brazing CBN grinding wheel under the temperature condition is, and the evaluation indexes under the temperature are interpolated by a cubic spline to obtain a function F (T), wherein K isFThe value range of (A) is 2000-8000, and KQThe value range of (A) is 0.2-0.8;
s105, taking the electroplated grinding wheel as a reference group, obtaining an evaluation index g (Ep), and selecting a proper correction coefficient K, wherein K is between 1.3 and 2, and F (T) is not less than Kg (Ep) as an evaluation function of the induction brazing temperature T, so that an induction brazing temperature interval meeting the grinding requirement is obtained, and the larger the correction coefficient K is, the smaller the obtained induction brazing temperature interval is.
Example two:
fig. 1 is a schematic structural diagram of a grinding test device of an evaluation model and method for an induction brazing temperature of a superhard abrasive grinding wheel provided by the invention, a clamp 1 is arranged on a titanium alloy workpiece 2, in the embodiment, CBN grinding particles 4 with a granularity of 80/100 meshes and a diameter of 150-180 μm and Ag-Cu-Ti alloy solder are selected as the abrasive, the main components of the abrasive are 96(72Ag-28Cu) -4Ti (wt.%), a single-layer brazed CBN grinding wheel 3 is manufactured by high-frequency induction brazing, the diameter of the grinding wheel 3 is 6mm, in the test, a thermal infrared imager is used for measuring temperature, the brazing temperature is controlled to be 880-1000 ℃, and 7 groups of samples are brazed at intervals of 20 ℃.
And performing a TC4 titanium alloy grinding test on each group of brazing samples under the condition of constant grinding dosage, wherein the size of the titanium alloy is 50mm multiplied by 5mm multiplied by 100mm, and the grinding parameters are as follows: the linear speed of the grinding wheel is 6m/s, the cutting depth is 0.01mm, and the feeding speed is 600 mm/min; in addition, the electroplated CBN grinding wheel is used as a reference group to obtain the normal grinding force F of each group of samples in a stable grinding stateTWhen each group of grinding wheels fails, the grinding amount Q of the workpiece material is calculatedTThe results are shown in Table 1.
TABLE 1 Normal grinding force for grinding test of each group of samples
Figure GDA0003466597990000041
Get KF＝4000，KQ0.5, according to formula g (t) KF/FT+KQ·QTAnd calculating the evaluation value g (T) of each group of brazing grinding wheels, taking the brazing temperature T as an independent variable and the evaluation function g (T) as a dependent variable, and performing cubic spline interpolation on the obtained data to obtain a curve, wherein the curve is shown in figure 2, the evaluation value g (T) of the brazing grinding wheels at black data points in figure 2 is shown in figure 2, and the curve is a data interpolation function F (T).
From table 1, the evaluation index g (ep) of the plated grinding wheel is calculated as 4182.692, and K is calculated as 1.3, which includes:
F(T)≥Kg(Ep)
solving to obtain:
927℃≤T≤961℃
namely, the temperature range (927 ℃, 961 ℃) is the brazing temperature range.
The model and the method for evaluating the induction brazing temperature of the superhard abrasive grinding wheel can quantitatively give the temperature range of a molten pool for induction brazing, so that the strength and the grinding performance of a joint can meet the use requirements; the model comprehensively evaluates the performances of the sharpness of the grinding wheel and the service life of the grinding wheel by taking the brazing temperature as an independent variable, thereby obtaining the brazing temperature range meeting the requirement of the grinding performance, adopts induction brazing to prepare a plurality of groups of single-layer brazing superhard abrasive grinding wheels under a series of temperature conditions, respectively represents the sharpness of the grinding wheel and the service life of the grinding wheel by the grinding force and the total material removal amount obtained by a grinding test, finally takes the single-layer electroplating superhard abrasive grinding wheel as a control group, quantitatively gives the temperature range of a molten pool of the induction brazing through an established evaluation function, thereby ensuring that the joint strength and the grinding performance meet the use requirement, and providing evaluation basis for optimizing the induction brazing temperature control of the superhard abrasive grinding wheel.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (4)

1. A superhard abrasive grinding wheel induction brazing temperature evaluation model and method are characterized in that: the method comprises the following steps:
s101, several temperatures (T) at equal intervals0……Tn) Preparing a plurality of groups of single-layer brazing superhard abrasive grinding wheel samples by an induction brazing method;
s102, carrying out a wear test on each group of grinding wheel samples under the condition of constant grinding dosage until the grinding wheel samples fail;
s103, calculating the total removal amount Q of the workpiece materials of each group of grinding wheels through the grinding parameters and the grinding strokeT：
QT＝ap·len·w·P (1)
In the formula: a ispFor cutting depth, len is the length of the workpiece, w is the width of the workpiece, and P is the total number of grinding strokes when the grinding wheel fails;
s104, the comprehensive index model for evaluating the induction brazing temperature is as follows:
g(T)＝KF/FT+KQ·QT (2)
in the formula: g (T) is a temperature evaluation index, KF、KQRespectively initial normal grinding force FTAnd total amount of workpiece material removed QTThe evaluation indexes at all temperatures are interpolated by cubic splines to obtain a function F (T);
s105, taking the electroplated grinding wheel as a reference group to obtain an evaluation index g (Ep), and obtaining an induction brazing temperature interval meeting the grinding requirement by selecting a proper correction coefficient K, wherein K is between 1.3 and 2, and F (T) is more than or equal to Kg (Ep) as an evaluation function of the induction brazing temperature T.
2. The model and method for evaluating the induction brazing temperature of a superabrasive grinding wheel according to claim 1, wherein: in step S102, the definition criterion of the failure is: calculating the grinding force ratio F during grinding according to the grinding force measured in real timen/FtI.e., the normal to tangential force ratio of the workpiece, the failure criterion is reached when the force ratio is gradually increased to 2.5 times the initial force ratio.
3. The model and method for evaluating the induction brazing temperature of a superabrasive grinding wheel according to claim 1, wherein: said KFThe value range of (a) is 2000-8000.
4. The model and method for evaluating the induction brazing temperature of a superabrasive grinding wheel according to claim 1, wherein: said KQThe value range of (A) is 0.2-0.8.
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