A method and device for measuring dynamic bulk modulus of abrasive cloth wheel

Abstract

The present invention provides a method and device for measuring the dynamic bulk modulus of an emery wheel, the method comprising: obtaining basic parameter data of the emery wheel, the basic parameter data including the width and compression deformation of the emery wheel; obtaining the motion radius of the emery wheel at a target speed; measuring the normal polishing force exerted on the emery wheel at the target speed and the contact arc length between the emery wheel and the workpiece; determining a calculation model based on the basic parameter data, the motion radius, the normal polishing force and the contact arc length, and obtaining the bulk modulus of the emery wheel at the target speed based on the calculation model. The present invention can not only accurately measure the motion parameters of the emery wheel, but also quickly obtain the dynamic bulk modulus of the emery wheel through the calculation model, and the calculation process is concise and efficient.

Description

Technical Field

[0001] The invention relates to the technical field of precision parts polishing, and in particular to a method and a device for measuring the dynamic bulk modulus of an emery wheel. Background Art

[0002] Emery wheels are often used for polishing and precision grinding of parts. Bulk modulus is a kind of elastic model. The bulk modulus of the emery wheel can directly reflect the "hardness" of the abrasive tool. The bulk modulus of the emery wheel will have an important impact on the polishing quality of parts.

[0003] The emery wheel is a grinding tool formed by fixing a certain number of abrasive belt sheets on the mandrel through adhesive. When it rotates at high speed with the main shaft, the abrasive belt sheets around the mandrel will expand radially under the action of centrifugal force, and the radius of the emery wheel is the expansion radius of the emery wheel at this speed. In the working state, the bulk modulus of the high-speed rotating emery wheel will vary with the speed, that is, the bulk modulus of the emery wheel, and the bulk modulus will directly affect the polishing quality.

[0004] Therefore, how to calculate the bulk modulus of the grinding wheel under high-speed rotation has become an urgent problem to be solved by the current technical personnel. Summary of the invention

[0005] In view of this, it is necessary to provide a method and device for measuring the dynamic bulk modulus of an emery wheel to solve the problem that the bulk modulus of an emery wheel under high rotation cannot be calculated.

[0006] In order to solve the above technical problems, the present invention provides a method for measuring the dynamic bulk modulus of an abrasive wheel, comprising:

[0007] Obtaining basic parameter data of the emery wheel, the basic parameter data including the width and compression deformation of the emery wheel;

[0008] Obtain the movement radius of the abrasive wheel at the target speed;

[0009] Measure the normal polishing force on the abrasive wheel at the target speed and the contact arc length between the abrasive wheel and the workpiece;

[0010] A calculation model is determined according to the basic parameter data, the movement radius, the normal polishing force and the contact arc length, and the bulk modulus of the grinding wheel at the target rotation speed is obtained based on the calculation model.

[0011] In a possible implementation, the calculation formula of the calculation model is:

[0012]

[0013] Where K is the bulk modulus of the grinding wheel, b is the width of the grinding wheel, and R mis the movement radius of the grinding wheel at the target speed, l is the contact arc length between the grinding wheel and the workpiece, a p Indicates the amount of compression deformation, F n It represents the normal polishing force on the abrasive wheel at the target speed, and α represents half of the central angle corresponding to the contact arc length between the abrasive wheel and the workpiece.

[0014] In a possible implementation, the movement radius of the emery wheel is greater than the stationary radius of the emery wheel, and obtaining the movement radius of the emery wheel at the target rotation speed includes:

[0015] Install the abrasive cloth wheel on the spindle and fix the workpiece with preset flatness on the machine tool table;

[0016] Control the spindle to rotate at the target speed, and move the spindle slowly in the target direction until the abrasive wheel contacts the workpiece, and record the spindle coordinate at this time as the first coordinate;

[0017] The spindle speed is controlled to be zero, and the spindle is slowly moved in the target direction until the abrasive wheel in a stationary state contacts the workpiece, and the spindle coordinate at this time is recorded as the second coordinate;

[0018] Calculating a radius increment of the abrasive wheel at a target rotation speed based on the first coordinate and the second coordinate;

[0019] The moving radius of the grinding wheel at the target speed is calculated based on the stationary radius and the radius increment of the grinding wheel. In a possible implementation, the calculation formula of the moving radius of the grinding wheel at the target speed is:

[0020] R m =r+a;

[0021] Wherein, r represents the stationary radius of the abrasive wheel, and a represents the radius increment of the abrasive wheel at the target speed.

[0022] In one possible implementation, a dynamometer for measuring the pressure on the workpiece is provided between the workpiece and the machine tool worktable. The dynamometer is communicatively connected to the service terminal. When the pressure signal transmitted by the dynamometer changes, it is determined that the emery wheel is in contact with the workpiece.

[0023] In a possible implementation, the dynamometer is a three-axis dynamometer.

[0024] In a possible implementation, the normal polishing force on the emery wheel at the target rotation speed and the contact arc length between the emery wheel and the workpiece are measured based on a dynamometer disposed between the workpiece and a machine tool worktable.

[0025] In a possible implementation, the calculation formula of α is:

[0026]

[0027] In a possible implementation, the bulk modulus of the abrasive wheel at the target rotation speed is obtained based on a calculation model, including:

[0028] Converting the normal polishing force of the abrasive wheel at a target rotation speed into an electrical signal;

[0029] Amplify the electrical signal;

[0030] The amplified electrical signal is processed to obtain the normal polishing force.

[0031] In order to solve the above problems, the present invention also provides a device for calculating the dynamic bulk modulus of an abrasive wheel, comprising:

[0032] Parameter data acquisition module: used to obtain basic parameter data of the grinding wheel, including the width and compression deformation of the grinding wheel;

[0033] A motion radius acquisition module; obtaining the motion radius of the abrasive wheel at a target speed;

[0034] A measuring module, used to measure the normal polishing force exerted on the abrasive wheel at a target rotation speed and the contact arc length between the abrasive wheel and the workpiece;

[0035] The calculation module is used to determine a calculation model according to the basic parameter data, the movement radius, the normal polishing force and the contact arc length, and obtain the bulk modulus of the grinding wheel at a target rotation speed based on the calculation model.

[0036] The beneficial effect of adopting the above embodiment is: after obtaining the basic parameter data of the emery wheel, the movement radius of the emery wheel at the target speed is obtained, and then the normal polishing force on the emery wheel at the target speed and the contact arc length between the emery wheel and the workpiece are measured, and the calculation model is determined according to the basic parameter data, the movement radius, the normal polishing force and the contact arc length, and the bulk modulus of the emery wheel at the target speed is obtained based on the calculation model. The present invention can not only accurately measure the movement parameters of the emery wheel, but also quickly obtain the bulk modulus of the emery wheel through the calculation model, and the calculation process is simple and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 A schematic flow chart of an embodiment of a method for measuring the dynamic bulk modulus of an abrasive wheel provided by the present invention;

[0039] Figure 2 A scene diagram of an abrasive wheel during machining, which is an embodiment of a method for measuring the dynamic bulk modulus of an abrasive wheel provided by the present invention;

[0040] Figure 3 A schematic diagram of the principle of calculating the radius increment of an abrasive wheel according to an embodiment of the method for measuring the dynamic bulk modulus of an abrasive wheel provided by the present invention;

[0041] Figure 4 A schematic diagram of the working principle of a dynamometer of an embodiment of a method for measuring the dynamic bulk modulus of an abrasive wheel provided by the present invention;

[0042] Figure 5 A schematic structural diagram of an embodiment of a method for measuring the dynamic bulk modulus of an abrasive wheel provided by the present invention. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0044] Some of the block diagrams shown in the accompanying drawings are functional entities that do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor systems and / or microcontroller systems.

[0045] Reference to an "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0046] The embodiments of the present invention provide a method and device for measuring the dynamic bulk modulus of an abrasive wheel, which are described below.

[0047] Figure 1 A schematic flow chart of an embodiment of a method for measuring the dynamic bulk modulus of an abrasive wheel provided by the present invention. Figure 2 A scene diagram of an emery wheel during machining, which is one embodiment of a method for measuring the dynamic bulk modulus of an emery wheel provided by the present invention.

[0048] Reference Figure 1 and Figure 2 The present invention provides a method for measuring the dynamic bulk modulus of an abrasive wheel, comprising:

[0049] S101, obtaining basic parameter data of an emery wheel, the basic parameter data including the width and compression deformation of the emery wheel;

[0050] S102, obtaining the movement radius of the abrasive wheel at a target rotation speed;

[0051] S103, measuring the normal polishing force on the emery wheel at the target rotation speed and the contact arc length between the emery wheel and the workpiece;

[0052] S104, determining a calculation model according to basic parameter data, movement radius, normal polishing force, and contact arc length, and obtaining a bulk modulus of the emery wheel at a target rotation speed based on the calculation model.

[0053] The beneficial effect of adopting the above embodiment is that after obtaining the basic parameter data of the emery wheel, the present invention obtains the movement radius of the emery wheel at the target speed, then measures the normal polishing force on the emery wheel at the target speed and the contact arc length between the emery wheel and the workpiece, determines the calculation model based on the basic parameter data, the movement radius, the normal polishing force and the contact arc length, and obtains the bulk modulus of the emery wheel at the target speed based on the calculation model. The present invention can not only accurately measure the movement parameters of the emery wheel, but also quickly obtain the bulk modulus of the emery wheel through the calculation model, and the calculation process is simple and efficient.

[0054] In one embodiment, the calculation formula of the calculation model is:

[0055]

[0056] Where K is the bulk modulus of the grinding wheel, b is the width of the grinding wheel, and R m is the movement radius of the grinding wheel at the target speed, l is the contact arc length between the grinding wheel and the workpiece, a p Indicates the amount of compression deformation, F n It represents the normal polishing force on the abrasive wheel at the target speed, and α represents half of the central angle corresponding to the contact arc length between the abrasive wheel and the workpiece.

[0057] Specifically, the bulk modulus is a type of elastic modulus, which can characterize the macroscopic properties of an object, that is, a physical quantity of the relationship between the volume strain and the average stress of an object. Assuming that the volume of an object is V0 under a pressure of P0, when the pressure on the object changes to P1, its volume changes to V1, then the expression of the bulk modulus is:

[0058]

[0059] When the emery wheel rotates at high speed, its radius will increase. During the polishing process, due to the interaction between the emery wheel and the workpiece, the emery wheel will deform radially. Figure 1 During the polishing process, it is assumed that the workpiece does not deform in the contact area, and the deformation of the grinding wheel is the volume deformation caused by its compression.

[0060] The volume of the abrasive wheel at a certain speed is:

[0061]

[0062] Among them, b represents the width of the abrasive wheel, R m Indicates the movement radius of the abrasive wheel at the target speed.

[0063] The reduction in the volume of the abrasive wheel during processing is:

[0064] V1-V0=b(S 扇形DOE -S ΔODE ); (3)

[0065] The area of ​​the sector DOE is:

[0066]

[0067] The expression of angle α is:

[0068]

[0069] where a p It is the compression deformation of the emery wheel and can be set on the CNC machine tool.

[0070] The area of ​​the triangular ODE is:

[0071]

[0072] Substituting equations (4) and (6) into equation (3), we can obtain:

[0073]

[0074] Considering that during the polishing process, the emery wheel can achieve an increase in radius and enhanced flexibility during high-speed rotation, and can make conformal contact with the workpiece surface, when the compression of the emery wheel is greater than a certain value during polishing, the contact area can be approximately considered to be a rectangle. Then one side of the rectangle is the contact arc length l, and the other side is the emery wheel width b.

[0075] Then the pressure on the emery wheel during unprocessing is 0, and the pressure on the emery wheel during polishing is:

[0076]

[0077] Substituting equations (2), (7) and (8) into equation (1), we can obtain:

[0078]

[0079] Through the above derivation, the calculation formula of the calculation model of the above embodiment can be obtained.

[0080] Figure 3 A schematic diagram of the principle of calculating the radius increment of an abrasive wheel according to an embodiment of a method for measuring the dynamic bulk modulus of an abrasive wheel provided by the present invention.

[0081] Reference Figure 3 In one embodiment, the movement radius of the emery wheel is greater than the stationary radius of the emery wheel, and obtaining the movement radius of the emery wheel at the target rotation speed includes:

[0082] Install the abrasive cloth wheel on the spindle and fix the workpiece with preset flatness on the machine tool table;

[0083] Control the spindle to rotate at the target speed, and move the spindle slowly in the target direction until the abrasive wheel contacts the workpiece, and record the spindle coordinate at this time as the first coordinate;

[0084] The spindle speed is controlled to be zero, and the spindle is slowly moved in the target direction until the abrasive wheel in a stationary state contacts the workpiece, and the spindle coordinate at this time is recorded as the second coordinate;

[0085] Calculating a radius increment of the abrasive wheel at a target rotation speed based on the first coordinate and the second coordinate;

[0086] The moving radius of the grinding wheel at the target speed is calculated based on the static radius and radius increment of the grinding wheel.

[0087] Specifically, the emery wheel is mounted on the spindle, and a workpiece with a preset flatness is fixed on the machine tool worktable. Here, the preset flatness can be a workpiece of 0.005mm to 0.015mm, so as to improve the measurement accuracy of the radius increment. When the abrasive belt sheets of the emery wheel are expanded outward due to the centrifugal force, the radius of the emery wheel will increase. When the emery wheel moves slowly along the preset direction until the emery wheel just touches the flat plate, this time is recorded as time t1, and the spindle coordinate at this moment is recorded as the first coordinate; and when the emery wheel touches the flat plate, the signal in the dynamometer will fluctuate slightly, and this fluctuation can be recorded in the acquisition meter of the service terminal. It can be observed on the computer; then the spindle stops running, and the radius of the emery wheel in the static state is smaller than the radius in the rotating state. The emery wheel in the static state continues to move slowly in the preset direction by operating the handle until the emery wheel touches the flat plate. This time is recorded as time t2, and the coordinate at this moment is recorded as the second coordinate; when the emery wheel just touches the flat plate, the signal in the dynamometer changes slightly, which can also be observed on the computer. The radius increment of the emery wheel at the target speed is calculated by the first coordinate and the second coordinate; then the moving radius of the emery wheel at the target speed is calculated by the static radius and radius increment of the emery wheel.

[0088] In one embodiment, the calculation formula of the movement radius of the emery wheel at the target speed is:

[0089] R m =r+a;

[0090] Wherein, r represents the stationary radius of the abrasive wheel, and a represents the radius increment of the abrasive wheel at the target speed.

[0091] In one embodiment, the target direction is a vertical direction.

[0092] Figure 4 A schematic diagram of the working principle of a dynamometer of an embodiment of a method for measuring the dynamic bulk modulus of an abrasive wheel provided by the present invention.

[0093] Reference Figure 4 In one embodiment, a dynamometer for measuring the pressure on the workpiece is provided between the workpiece and the machine tool worktable. The dynamometer is communicatively connected to the service terminal. When the pressure signal transmitted by the dynamometer changes, it is determined that the emery wheel is in contact with the workpiece.

[0094] In one embodiment, the force gauge is a three-axis force gauge.

[0095] In one embodiment, the normal polishing force on the abrasive wheel at the target rotation speed and the contact arc length between the abrasive wheel and the workpiece are measured based on a dynamometer disposed between the workpiece and a machine tool worktable.

[0096] In one embodiment, the calculation formula of α is:

[0097]

[0098] In one embodiment, the bulk modulus of the abrasive wheel at the target rotation speed is obtained based on the calculation model, including:

[0099] Convert the movement radius, normal polishing force and contact arc length of the abrasive wheel at the target speed into electrical signals;

[0100] Amplify the electrical signal;

[0101] The amplified electrical signal is processed based on the calculation model of the service terminal to calculate the bulk modulus of the emery wheel at the target speed.

[0102] The amplified electrical signal is subjected to data processing to obtain the normal polishing force.

[0103] Specifically, the dynamometer converts the polishing force signal into an electrical signal, amplifies the electrical signal, collects the amplified electrical signal through the data acquisition instrument of the service terminal, and transmits the collected electrical signal to the computer, which processes the data and obtains the specific value of the polishing force.

[0104] Figure 5 A schematic structural diagram of an embodiment of a method for measuring the dynamic bulk modulus of an abrasive wheel provided by the present invention.

[0105] Reference Figure 5 The present invention also provides a device for calculating the dynamic bulk modulus of an abrasive wheel, comprising:

[0106] Parameter data acquisition module 501: used to acquire basic parameter data of the grinding wheel, the basic parameter data including the width and compression deformation of the grinding wheel;

[0107] A movement radius acquisition module 502 is used to acquire the movement radius of the abrasive wheel at a target rotation speed;

[0108] The measuring module 503 is used to measure the normal polishing force exerted on the grinding wheel at the target rotation speed and the contact arc length between the grinding wheel and the workpiece;

[0109] The calculation module 504 is used to determine the calculation model according to the basic parameter data, the movement radius, the normal polishing force and the contact arc length, and obtain the bulk modulus of the grinding wheel at the target rotation speed based on the calculation model.

[0110] The beneficial effects of the above embodiment are as follows: after the parameter data acquisition module 501 acquires the basic parameter data of the emery wheel, the motion radius acquisition module 502 acquires the motion radius of the emery wheel at the target speed, and then the measurement module 503 measures the normal polishing force on the emery wheel at the target speed and the contact arc length between the emery wheel and the workpiece, and the calculation module 504 determines the calculation model according to the basic parameter data, the motion radius, the normal polishing force and the contact arc length, and obtains the bulk modulus of the emery wheel at the target speed based on the calculation model. . The present invention can not only accurately measure the motion parameters of the emery wheel, but also quickly obtain the bulk modulus of the emery wheel through the calculation model, and the calculation process is simple and efficient.

[0111] The above embodiment provides a method and device for measuring the dynamic bulk modulus of an abrasive wheel, which can realize the technical solution described in the above embodiment of a method for measuring the dynamic bulk modulus of an abrasive wheel. The specific implementation principles of the above modules or units can be based on the corresponding contents in the embodiment of a method for measuring the dynamic bulk modulus of an abrasive wheel, which will not be repeated here.

[0112] The above is a detailed introduction to the method for measuring the dynamic bulk modulus of an abrasive wheel provided by the present invention. Specific examples are used in this article to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for measuring the dynamic bulk modulus of an abrasive wheel, characterized in that: include: Obtaining basic parameter data of the emery wheel, wherein the basic parameter data includes the width and compression deformation of the emery wheel; Obtain the movement radius of the abrasive wheel at the target speed; measuring the normal polishing force exerted on the emery wheel at a target rotation speed and the contact arc length between the emery wheel and the workpiece; Determine a calculation model according to the basic parameter data, the motion radius, the normal polishing force and the contact arc length, and obtain the bulk modulus of the emery wheel at the target rotation speed based on the calculation model; The calculation formula of the calculation model is: ； in, K represents the bulk modulus of the abrasive wheel, b is the width of the abrasive wheel, R m is the movement radius of the abrasive wheel at the target speed, l Indicates the contact arc length between the abrasive wheel and the workpiece. a p Indicates the amount of compression deformation, F n It represents the normal polishing force on the abrasive wheel at the target speed. α It represents half of the central angle corresponding to the contact arc length between the abrasive wheel and the workpiece.

2. The method for measuring the dynamic bulk modulus of an abrasive wheel according to claim 1, characterized in that: The moving radius of the emery wheel is greater than the stationary radius of the emery wheel, and the step of obtaining the moving radius of the emery wheel at the target rotation speed includes: Install the abrasive cloth wheel on the spindle and fix the workpiece with preset flatness on the machine tool table; Control the spindle to rotate at the target speed, and at the same time slowly move the spindle in the target direction until the abrasive wheel contacts the workpiece, and record the spindle coordinate at this time as the first coordinate; Control the rotation speed of the spindle to zero, and at the same time slowly move the spindle in the target direction until the grinding wheel in a stationary state contacts the workpiece, and record the spindle coordinate at this time as the second coordinate; Calculating a radius increment of the abrasive wheel at the target rotation speed based on the first coordinate and the second coordinate; The moving radius of the grinding wheel at the target rotation speed is calculated based on the stationary radius of the grinding wheel and the radius increment.

3. The method for measuring the dynamic bulk modulus of an abrasive wheel according to claim 2, characterized in that: The calculation formula of the motion radius of the emery wheel at the target speed is: R m = r + a ； in, r Indicates the static radius of the abrasive wheel, a Indicates the radius increment of the abrasive wheel at the target speed.

4. The method for measuring the dynamic bulk modulus of an abrasive wheel according to claim 2, characterized in that: A dynamometer for measuring the pressure on the workpiece is provided between the workpiece and the machine tool worktable. The dynamometer is in communication connection with the service terminal. When the pressure signal transmitted by the dynamometer changes, it is determined that the emery wheel is in contact with the workpiece.

5. The method for measuring the dynamic bulk modulus of an abrasive wheel according to claim 4, characterized in that: The dynamometer is a three-axis dynamometer.

6. The method for measuring the dynamic bulk modulus of an abrasive wheel according to claim 1, characterized in that: The normal polishing force on the emery wheel at the target rotation speed and the contact arc length between the emery wheel and the workpiece are measured based on a dynamometer arranged between the workpiece and the machine tool worktable.

7. The method for measuring the dynamic bulk modulus of an abrasive wheel according to claim 1, characterized in that: The calculation formula of α is: 。 8. The method for measuring the dynamic bulk modulus of an abrasive wheel according to claim 1, characterized in that: The step of obtaining the bulk modulus of the abrasive wheel at the target speed based on the calculation model includes: converting the normal polishing force at the target rotation speed into an electrical signal; Performing signal amplification processing on the electrical signal; The amplified electrical signal is subjected to data processing to obtain the normal polishing force.

9. A device for calculating the dynamic bulk modulus of an abrasive wheel, characterized in that: include: Parameter data acquisition module: used to acquire basic parameter data of the grinding wheel, wherein the basic parameter data includes the width and compression deformation of the grinding wheel; A motion radius acquisition module; obtaining the motion radius of the abrasive wheel at a target speed; A measuring module, used to measure the normal polishing force exerted on the grinding wheel at a target rotation speed and the contact arc length between the grinding wheel and the workpiece; A calculation module, used to determine a calculation model according to the basic parameter data, the movement radius, the normal polishing force and the contact arc length, and obtain the bulk modulus of the emery wheel at a target rotation speed based on the calculation model; The calculation formula of the calculation model is: ； in, K represents the bulk modulus of the abrasive wheel, b is the width of the abrasive wheel, R m is the movement radius of the abrasive wheel at the target speed, l Indicates the contact arc length between the abrasive wheel and the workpiece. a p Indicates the amount of compression deformation, F n It represents the normal polishing force on the abrasive wheel at the target speed. α It represents half of the central angle corresponding to the contact arc length between the abrasive wheel and the workpiece.

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