CN107219166B - A kind of measuring method of coefficient of friction - Google Patents
A kind of measuring method of coefficient of friction Download PDFInfo
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- CN107219166B CN107219166B CN201710527994.6A CN201710527994A CN107219166B CN 107219166 B CN107219166 B CN 107219166B CN 201710527994 A CN201710527994 A CN 201710527994A CN 107219166 B CN107219166 B CN 107219166B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
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Abstract
The present invention provides a kind of measuring methods of coefficient of friction, are related to mechanical engineering field.The measuring method of coefficient of friction, which includes: that the first determination unit is fixed, pulls the first plate, detect the first value of thrust of the first plate first pulling force suffered relative to the movement of the first determination unit, the third value of thrust of the second plate of detection third pulling force suffered relative to the movement of the second determination unit；Second value of thrust of the first determination unit rotation the first plate of detection second pulling force suffered relative to the movement of the first determination unit, detects fourth value of thrust of second plate relative to the 4th pulling force suffered by the second determination unit；Flange coefficient of friction is calculated according to third value of thrust；Die entrance area coefficient of friction is calculated according to the first value of thrust, the second value of thrust, third value of thrust and the 4th value of thrust.Measuring friction coefficient device provided by the invention and equipment can detect flange coefficient of friction and die entrance area coefficient of friction simultaneously, improve the working efficiency of measuring friction coefficient device.
Description
Technical field
The present invention relates to mechanical engineering fields, in particular to a kind of measuring method of coefficient of friction.
Background technique
Due to numerical simulation technology shorten the product design period and save production cost on outstanding behaviours, plate at
It is widely used in the optimization design of shape.The accuracy of analog result depends on correct contact model, wherein rubbing
Model occupies decisive action.
Currently, the mode for generalling use measuring establishes friction model.In the numerical simulation of sheet forming
The same friction model is generallyd use to describe the frictional behavior of flange and die entrance area, in fact, flange and cavity plate
The frictional behavior of fillet area has apparent difference, describes the two using a friction model in the numerical simulation of sheet forming
The frictional behavior in region causes analog result to be distorted.It can rub at each position in the practical forming process of accurate description plate to establish
Wipe the friction model of characteristic, it is necessary to which one kind is capable of providing accurate simulation sheet forming process flange and the friction of die entrance area
The device and method of characteristic.
For the demand, occurs the device that frictional behavior measures in many sheet formings in recent years.Than more typical
Friction testing arrangement and method have following several:
1, it is tested by means of the plate sliding friction of stretching-machine and fixture, this method can effectively measure flange plate
Frictional behavior between mold.
2, one end of stretch bending frictional experiment, party's decree plate is fixed by fixture, and the other end is connected with stretching-machine, backup plate
The elongation strain of material carries out frictional experiment, and does not remove plate by the influence of the deformation drag at fillet, not with actual condition
Symbol.
3, sonde method friction testing system, this method measure coefficient of friction by installing probe sensor on mold,
Installing probe sensor has destructiveness, higher cost to mold, and is not suitable for installing probe at die entrance.
4, disk pin type frictional experiment, this method are suitable only for the frictional behavior of simulation flange.
These friction testing arrangements and method are only capable of to an area at flange in sheet forming or die entrance
Domain carries out friction measurement, cannot detect flange coefficient of friction and die entrance area coefficient of friction, simultaneously so as to cause rubbing
The working efficiency for wiping coefficient determination method is lower.
Summary of the invention
The purpose of the present invention is to provide a kind of measuring friction coefficient methods, can detect flange coefficient of friction simultaneously
And die entrance area coefficient of friction, improve the working efficiency of measuring friction coefficient method.
The present invention provides a kind of technical solution:
A kind of measuring method of coefficient of friction, it is described for measuring the coefficient of friction of sheet material to be measured in plate forming process
Coefficient of friction includes flange coefficient of friction and die entrance area coefficient of friction, and the sheet material to be measured includes interconnected first
Plate and the second plate, the measuring method of the coefficient of friction include:
First determination unit is fixed, first plate is pulled, first plate is detected and is surveyed relative to described first
Determine the first value of thrust of the first pulling force suffered by unit motion, detects second plate relative to the second determination unit and move institute
The third value of thrust for the third pulling force received, wherein first determination unit is supported with first plate, second measurement
Unit is supported with second plate；
First plate is pulled, the rotation of the first determination unit detects first plate relative to first measurement
Second value of thrust of the second pulling force suffered by unit motion detects second plate relative to suffered by second determination unit
The 4th pulling force the 4th value of thrust；
The flange coefficient of friction is calculated according to the third value of thrust；
It is calculated according to first value of thrust, second value of thrust, the third value of thrust and the 4th value of thrust
Die entrance area coefficient of friction.
Further, in preferred embodiments of the present invention, second determination unit includes the first Die and mould plate and second
Die and mould plate, the sheet material to be measured are held between first Die and mould plate and second Die and mould plate, pull second plate
It can be moved relative to first Die and mould plate and second Die and mould plate.
Further, described to calculate the flange according to the third value of thrust in preferred embodiments of the present invention
The step of coefficient of friction includes:
According to formula:
The flange coefficient of friction is calculated, wherein f is the flange coefficient of friction, F3For the third pulling force
Value, FNIt is second determination unit to the normal pressure of second plate, 2 be first Die and mould plate and second mold
The quantity of plate.
Further, in preferred embodiments of the present invention, first determination unit includes cylindrical mold, and described
One plate and the outer surface of the cylindrical mold support.
Further, described according to first value of thrust, second pulling force in preferred embodiments of the present invention
The step of value, the third value of thrust and the 4th value of thrust calculate the die entrance area coefficient of friction include:
It is calculated according to first value of thrust, second value of thrust, the third value of thrust and the 4th value of thrust
Frictional force out；
Die entrance area coefficient of friction is calculated according to the frictional force.
Further, described according to first value of thrust, second pulling force in preferred embodiments of the present invention
The step of value, the third value of thrust and the 4th value of thrust calculate frictional force include:
Second plate is calculated according to the first value of thrust and third value of thrust to move relative to second determination unit
Fillet resistance；
Second plate is calculated according to the second value of thrust and the 4th value of thrust to move relative to second determination unit
Deformation drag；
According to frictional force described in the deformation drag and the fillet drag evaluation.
Further, in preferred embodiments of the present invention, first value of thrust of foundation and third value of thrust calculate institute
The step of stating fillet resistance of second plate by the second determination unit include:
According to formula:
|F3-F1|=Fc
Calculate the fillet resistance, wherein FCFor fillet resistance, F3For third value of thrust, F1For the first value of thrust.
Further, in preferred embodiments of the present invention, second value of thrust of foundation and the 4th value of thrust calculate institute
The step of stating deformation drag of second plate by second determination unit include:
According to formula:
|F4-F2|=FB
Calculate the deformation drag, wherein FBFor deformation drag, F4For the 4th value of thrust, F2For the second value of thrust.
Further, described according to the deformation drag and the fillet resistance gauge in preferred embodiments of the present invention
The step of calculating the frictional force include:
According to formula:
|FC-FB|=FR
The frictional force is calculated, wherein FBFor deformation drag, FCFor fillet resistance, FRFor frictional force.
Further, described to calculate the die entrance according to the frictional force in preferred embodiments of the present invention
The step of area's coefficient of friction includes:
According to formula:
Die entrance area coefficient of friction is calculated, wherein u is die entrance area coefficient of friction, and a is second plate
Material passes through bending angle when the second determination unit, FRFor the frictional force, F3For third value of thrust, F1For the first value of thrust.
The beneficial effect of the measuring method of coefficient of friction provided by the invention is: in the present invention, the first determination unit is solid
Fixed, the first plate of detection can move the first value of thrust of the first suffered pulling force relative to the first determination unit, detect the second plate
Material can move the third value of thrust of suffered third pulling force relative to the second determination unit；The rotation of first determination unit, detection the
One plate can move the second value of thrust of the second suffered pulling force relative to the first determination unit, and the second plate of detection can be relative to
4th value of thrust of the 4th pulling force suffered by second determination unit；Flange coefficient of friction is calculated according to third value of thrust；Foundation
First value of thrust, the second value of thrust, third value of thrust and the 4th value of thrust calculate die entrance area coefficient of friction.In the present invention
In, flange coefficient of friction and die entrance area coefficient of friction can be detected simultaneously, improve measuring friction coefficient method
Working efficiency.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the structural schematic diagram of measuring friction coefficient device provided in an embodiment of the present invention.
Fig. 2 is the structural schematic diagram of the pedestal of measuring friction coefficient device provided in an embodiment of the present invention.
Fig. 3 is the knot of the first set of molds of the first determination unit of measuring friction coefficient device provided in an embodiment of the present invention
Structure schematic diagram.
Fig. 4 is the circle of the first set of molds of the first determination unit of measuring friction coefficient device provided in an embodiment of the present invention
The structural schematic diagram of cylindrical mould.
Fig. 5 is the axis of the first set of molds of the first determination unit of measuring friction coefficient device provided in an embodiment of the present invention
The structural schematic diagram held.
Fig. 6 is the structural schematic diagram of the traction device of measuring friction coefficient device provided in an embodiment of the present invention.
Fig. 7 is the structural schematic diagram of the chucking appliance system of measuring friction coefficient device provided in an embodiment of the present invention.
Fig. 8 is the composition block diagram of measuring friction coefficient device provided in an embodiment of the present invention.
Fig. 9 is the flow chart of measuring friction coefficient method provided in an embodiment of the present invention.
Figure 10 is the flow chart of the sub-step of the step S600 of measuring friction coefficient method provided in an embodiment of the present invention.
Figure 11 is the flow chart of the sub-step of the step S610 of measuring friction coefficient method provided in an embodiment of the present invention.
Icon: 10- measuring friction coefficient device；100- pedestal；The first fixed part of 110-；112- first substrate；1122- is recessed
Slot；114- support portion；116- cavity；120- bottom plate；130- support plate；132- through-hole；134- pin hole；140- locating part；142-
Positioning region；144- support division；The first determination unit of 200-；The first detection device of 210-；The first set of molds of 220-；222- is cylinder-shaped
Mold；The first keyway of 2222-；The second keyway of 2224-；224- rotation axis；226- bearing；2262- bearing body；2264- outer circle
Protrusion；228- fixed pin；The second determination unit of 300-；310- second detection device；320- pressurizing device；The second mold of 330-
Group；The first Die and mould plate of 332-；The second Die and mould plate of 334-；400- traction device；410- bracket；420- servo electric jar；The top 430-
Plate；440- connector；500- chucking appliance system；The holding section 510-；520- interconnecting piece；The second fixed part of 530-；532- first baffle；
534- second baffle；536- connecting column；538- fixing buckle；539- accommodating cavity；600- display terminal；20- sheet material to be measured；21-
One plate；The second plate of 22-.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiment of the present invention provided in the accompanying drawings is not intended to limit below claimed
The scope of the present invention, but be merely representative of selected embodiment of the invention.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without creative efforts belongs to the model that the present invention protects
It encloses.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
In the description of the present invention, it is to be understood that, the orientation or position of the instructions such as term " on ", "lower", "inner" are closed
System for be based on the orientation or positional relationship shown in the drawings or the invention product using when the orientation usually put or position close
The orientation or positional relationship that system or those skilled in the art usually understand is merely for convenience of the description present invention and simplifies
Description, rather than the equipment of indication or suggestion meaning or element must have a particular orientation, constructed and grasped with specific orientation
Make, therefore is not considered as limiting the invention.
In addition, term " first ", " second " etc. are only used for distinguishing description, it is not understood to indicate or imply relatively important
Property.
In the description of the present invention, it is also necessary to which explanation is unless specifically defined or limited otherwise, term " setting ",
" connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be
Mechanical connection, is also possible to be electrically connected；It can be directly connected, two can also be can be indirectly connected through an intermediary
Connection inside element.For the ordinary skill in the art, above-mentioned term can be understood in the present invention with concrete condition
In concrete meaning.
Embodiment
Referring to Fig. 1, present embodiments providing a kind of measuring friction coefficient method, coefficient of friction provided in this embodiment is surveyed
The method of determining can detect flange coefficient of friction and die entrance area coefficient of friction simultaneously, improve measuring friction coefficient method
Working efficiency.
Measuring friction coefficient method provided in this embodiment is completed by measuring friction coefficient device 10.
In the present embodiment, measuring friction coefficient device 10 is used to measure the friction of sheet material to be measured 20 in plate forming process
Coefficient, sheet material to be measured 20 include the first plate 21 interconnected and the second plate 22, and coefficient of friction includes flange friction system
Several and die entrance area coefficient of friction, in the present embodiment, the first plate 21 is for detecting die entrance area coefficient of friction, and second
Plate 22 is for detecting flange coefficient of friction.
It should be noted that in the present embodiment, sheet material to be measured 20 includes the first plate 21 and the second plate 22, but not
It is limited to this, in other embodiments of the invention, sheet material to be measured 20 can also include third plate and the 4th plate, with this implementation
The equivalent scheme of example, can achieve the effect that the present embodiment, be within the scope of the invention.
In the present embodiment, the width of the first plate 21 and the second plate 22 is 0.034~0.4 times of length.
In the present embodiment, measuring friction coefficient device 10 includes pedestal 100 and the fixture being respectively arranged on pedestal 100
System 500, traction device 400, the first determination unit 200 and the second determination unit 300.
Traction device 400 is for drawing the first plate 21, so that the first plate 21 is transported relative to the first determination unit 200
It is dynamic, and the first plate 21 is driven to move relative to the second determination unit 300.
First determination unit 200 is flexibly connected with pedestal 100, for applying pressure for the first plate 21, and for the
When one determination unit 200 is opposing stationary with pedestal 100, measure the first plate 21 moved relative to the first determination unit 200 it is suffered
The first pulling force the first value of thrust.First determination unit 200 is also used to transport in the first determination unit 200 relative to pedestal 100
When dynamic, the second value of thrust that opposite first determination unit 200 of the first plate 21 moves the second suffered pulling force is measured.
Second determination unit 300 is used to apply pressure for the second plate 22, and in the first determination unit 200 and pedestal
100 it is opposing stationary when, measure the third pulling force that the second plate 22 moves suffered third pulling force relative to the second determination unit 300
Value is also used to that it is single relative to the second measurement to measure the second plate 22 when the first determination unit 200 is moved relative to pedestal 100
4th value of thrust of the 4th pulling force suffered by member 300.
Chucking appliance system 500 and pedestal 100 are rotatablely connected, and chucking appliance system 500 is for fixing the second plate 22, so that the second plate
Material 22 is for linear motion.
Fig. 1 and Fig. 2 are please referred to, in the present embodiment, pedestal 100 includes the first fixed part 110, bottom plate 120, two supports
Plate 130 and locating part 140, two support plates 130 are connect with bottom plate 120, and two support plates 130 are oppositely arranged, two supports
Through-hole 132 and pin hole 134 are provided on plate 130, through-hole 132 and pin hole 134 cooperate with the first determination unit 200, and first
Fixed part 110 is connect with bottom plate 120 far from one end of two support plates 130, the second determination unit 300 with the first fixed part
110 connections.Locating part 140 is connect with bottom plate 120 far from one end of two support plates 130, locating part 140 and chucking appliance system 500
Connection, with stationary fixture system 500.
In the present embodiment, the first fixed part 110 includes first substrate 112 and support portion 114, is set on first substrate 112
It is equipped with groove 1122, the second determination unit 300 is arranged in groove 1122, and the second determination unit 300 is connect with support portion 114,
First substrate 112 and support portion 114 form cavity 116, and the first plate 21, the second determination unit 300 pass through cavity 116.
Locating part 140 includes positioning region 142 and support division 144, and positioning region 142 is connect with the side of bottom plate 120, support division
144 connect with the other side of bottom plate 120, and chucking appliance system 500 is connect with positioning region 142, make chucking appliance system 500 can be relative to bottom plate
120 rotations, when chucking appliance system 500 turns to parallel in the width direction of bottom plate 120, support division 144 is supported with chucking appliance system 500
It holds, keeps chucking appliance system 500 fixed relative to bottom plate 120.
In the present embodiment, the first determination unit 200 includes the first detection device 210 and the first set of molds 220, the first inspection
It surveys device 210 to connect with the first plate 21, the first set of molds 220 is supported with the first plate 21.
In the present embodiment, the first detection device 210 is tension sensor.
Referring to Fig. 3, in the present embodiment, the first set of molds 220 includes cylindrical mold 222, rotation axis 224, bearing
226 and fixed pin 228, bearing 226 be sheathed on rotation axis 224, cylindrical mold 222 is sheathed on bearing 226, cylindrical mold
222 support with the second plate 22.Bearing 226 and through-hole 132 cooperate, and rotate cylindrical mold 222 can relative to pedestal 100.
Fixed pin 228 is connect with cylindrical mold 222, and fixed pin 228 cooperates with selectively pin hole 134, so that cylindrical mold 222
It is fixed.
Referring to Fig. 4, in the present embodiment, the first keyway 2222 and the second keyway are provided in cylindrical mold 222
2224, the first keyway 2222 cooperates with bearing 226, and the second keyway 2224 cooperates with fixed pin 228.
Referring to Fig. 5, in the present embodiment, bearing 226 includes bearing body 2262 and outer circle protrusion 2264, outer circle protrusion
2264 are arranged on bearing body 2262, and outer circle protrusion 2264 and the first keyway 2222 cooperate, so that bearing 226 and cylinder-shaped mould
Tool 222 is fixedly connected.
In the present embodiment, when traction device 400 pulls the movement of the first plate 21, cylindrical mold 222 can be relative to base
100 rotation or static of seat.
In the present embodiment, traction device 400 pulls the movement of the first plate 21, and bearing 226 and through-hole 132 cooperate, cylinder
Shape mold 222 rotates under the active force of the first plate 21, and fixed pin 228 and the second keyway 2224 and pin hole 134 cooperate, and makes to justify
Cylindrical mould 222 is fixed relative to pedestal 100.
In the present embodiment, cylindrical mold 222 is cylinder.The outer surface of first plate 21 and cylindrical mold 222
It supports.
In the present embodiment, when fixed pin 228 and pin hole 134 cooperate, cylindrical mold 222 is quiet relative to pedestal 100
Only, the first detection device 210 detects the first of the first pulling force suffered when the first plate 21 is moved relative to cylindrical mold 222
Value of thrust.
When fixed pin 228 does not cooperate with pin hole 134, when cylindrical mold 222 can be rotated relative to pedestal 100, first
Detection device 210 can detect the second pulling force of the second pulling force suffered when the first plate 21 is moved relative to cylindrical mold 222
Value.
Please continue to refer to Fig. 1, in the present embodiment, the second determination unit 300 includes second detection device 310, pressurization dress
320 and second set of molds 330 are set, second detection device 310 is connect with the first plate 21 and the second plate 22 respectively, the second mold
Group 330 is connect with the second plate 22, and pressurizing device 320 is connect with the second set of molds 330.
Second set of molds 330 includes the first Die and mould plate 332 and the second Die and mould plate 334, the first Die and mould plate 332 and the second mold
Plate 334 is connect with the first fixed part 110, and the second plate 22 is held between the first Die and mould plate 332 and the second Die and mould plate 334,
Pressurizing device 320 is connect with the first Die and mould plate 332.
In the present embodiment, the first Die and mould plate 332 is arranged in groove 1122, and the second Die and mould plate 334 connects with support portion 114
It connects, the first plate 21 and the first Die and mould plate 332 pass through cavity 116.
In the present embodiment, when fixed pin 228 and pin hole 134 cooperate, cylindrical mold 222 is quiet relative to pedestal 100
Only, second detection device 310 detects suffered when the second plate 22 is moved relative to the first Die and mould plate 332 and the second Die and mould plate 334
Third pulling force third value of thrust.
When fixed pin 228 does not cooperate with pin hole 134, when cylindrical mold 222 can be rotated relative to pedestal 100, second
Detection device 310 can detect the suffered 4th when the second plate 22 is moved relative to the first Die and mould plate 332 and the second Die and mould plate 334
4th value of thrust of pulling force.
In the present embodiment, second detection device 310 is tension sensor.
Pressurizing device 320 is electro-hydraulic loading cylinder.
It should be noted that in the present embodiment, pressurizing device 320 is electro-hydraulic loading cylinder, and but not limited to this,
In the other embodiment of the present invention, pressurizing device 320 can also can apply stressed device for other, be equal with the present embodiment
Scheme, can achieve the effect that the present embodiment, be within the scope of the invention.
Referring to Fig. 6, traction device 400 includes bracket 410, servo electric jar 420, top plate 430 and connector 440, top
Plate 430 is connect with one end of bracket 410, and servo electric jar 420 is connect with top plate 430, the side of connector 440 and servo-electric
Cylinder 420 is fixedly connected, and is flexibly connected with bracket 410, and the other side of connector 440 is connect with the first plate 21.
In the present embodiment, side of the connector 440 far from servo electric jar 420 is connected by the first detection device 210
The connection of first plate 21.
Referring to Fig. 7, chucking appliance system 500 includes holding section 510, interconnecting piece 520 and the second fixed part 530, holding section 510
And interconnecting piece 520 is connect with the second fixed part 530, interconnecting piece 520 and positioning region 142 are rotatablely connected, and make the second fixed part 530
Can be relative to base rotation, when the second fixed part 530 turns to parallel in the width direction of bottom plate 120, support division 144 and card
It holds portion 510 to support, keeps the second fixed part 530 fixed relative to bottom plate 120.
Second fixed part 530 includes first baffle 532, second baffle 534, connecting column 536 and fixing buckle 538, interconnecting piece
520 and holding section 510 connect respectively with the two sides of second baffle 534.First baffle 532 and second baffle 534 pass through connecting column
536 connections, form accommodating cavity 539, the second plate 22, the first mould between first baffle 532, second baffle 534 and connecting column 536
Have plate 332 and passes through accommodating cavity 539.Fixed part can make the second plate 22 relative to the first Die and mould plate 332 and the second Die and mould plate 334
It moves along a straight line when movement, ensure that the precision of measurement.
Referring to Fig. 8, in the present embodiment, measuring friction coefficient device 10 further further includes display terminal 600, show
Show that terminal 600 is connect with the first detection device 210 and second detection device 310, for showing the first value of thrust, the second pulling force
Value, third value of thrust and the 4th value of thrust.
In the present embodiment, third value of thrust is equal with the 4th value of thrust.It can be according to third value of thrust or the 4th pulling force
Value calculates flange coefficient of friction, calculates according to the first value of thrust, the second value of thrust, third value of thrust and the 4th value of thrust
Die entrance area coefficient of friction.
In the present embodiment, the first plate 21 is moved relative to cylindrical mold 222, and cylindrical mold 222 is relative to base
Seat 100 is static or movement the first plate 21 of meeting can generate different resistances.When cylindrical mold 222 is transported relative to pedestal 100
When dynamic, the first plate 21 is only deformed resistance relative to the movement of cylindrical mold 222.When cylindrical mold 222 is relative to base
When seat 100 is static, the first plate 21 is moved relative to cylindrical mold 222 generates fillet resistance, and fillet resistance includes deformation resistance
Power and frictional resistance.
Referring to Fig. 9, the specific work process of measuring friction coefficient method provided in this embodiment is as follows:
Step S100, the first determination unit 200 is fixed, pull the first plate 21, the first plate 21 of detection can be relative to
First determination unit 200 moves the first value of thrust of the first suffered pulling force.
In the present embodiment, cylindrical mold 222 is fixed relative to pedestal 100, pulls the first plate by traction device 400
Material 21 moves the first plate 21 relative to cylindrical mold 222, detects the first plate 21 fortune by the first detection device 210
Move the first value of thrust of the first suffered pulling force.
Step S200, the first determination unit 200 is fixed, the first plate 21 is pulled, to drive the movement of the second plate 22, inspection
Surveying second plate 22 can be relative to the third value of thrust of third pulling force suffered by the second determination unit 300.
In the present embodiment, cylindrical mold 222 is fixed relative to pedestal 100, and traction device 400 pulls the first plate
21, and the second plate 22 is driven to move relative to the first Die and mould plate 332 and the second Die and mould plate 334, second detection device 310 detects
Second plate 22 moves the third value of thrust of suffered third pulling force relative to the first Die and mould plate 332 and the second Die and mould plate 334.
Step S300 pulls the first plate 21, so that the first determination unit 200 rotates, detecting first plate 21 can
The second value of thrust of the second suffered pulling force is moved relative to the first determination unit 200.
In the present embodiment, cylindrical mold 222 can be rotated relative to pedestal 100, and traction device 400 pulls the first plate
21, move the first plate 21 relative to cylindrical mold 222, the first detection device 210 the first plate 21 of detection moves suffered
Third pulling force third value of thrust.
Step S400 pulls the first plate 21, so that the first determination unit 200 rotates, the second plate 22 of detection can be opposite
4th value of thrust of the 4th pulling force suffered by the second determination unit 300.
In the present embodiment, cylindrical mold 222 can be rotated relative to pedestal 100, and traction device 400 pulls the first plate
21, and the second plate 22 is driven to move relative to the first Die and mould plate 332 and the second Die and mould plate 334, second detection device 310 detects
Second plate 22 moves the 4th value of thrust of the 4th suffered pulling force relative to the first Die and mould plate 332 and the second Die and mould plate 334.
It should be appreciated that in other embodiments of the invention, the step in the measuring method of coefficient of friction of the invention
S100, S200 and step S300, S400 can be exchanged with each other, can first carry out step S300, S400 execute again step S100,
S200。
Step S500 calculates flange coefficient of friction according to third value of thrust.
In the present embodiment, according to formulaCalculate the flange coefficient of friction；
Wherein f is the flange coefficient of friction, F3For the third value of thrust, the FNIt is right for the second determination unit 300
The normal pressure of second plate 22.
In the present embodiment, it can be and calculate flange coefficient of friction according to third value of thrust by processor, it can be artificial
Manual calculations go out flange coefficient of friction.
Step S600 calculates die entrance according to the first value of thrust, the second value of thrust, third value of thrust and the 4th value of thrust
Area's coefficient of friction.
In the present embodiment, formula is utilized according to the first value of thrust, the second value of thrust, third value of thrust and the 4th value of thrust
Calculate die entrance area coefficient of friction.
Referring to Fig. 10, step S610, according to the first value of thrust, the second value of thrust, third value of thrust and the 4th value of thrust
Calculate frictional force.
In the present embodiment, the first value of thrust, the second value of thrust, third value of thrust and the 4th value of thrust is first depending on to utilize
Formula calculates frictional force, is further calculating die entrance area coefficient of friction.
Figure 11, step S611 are please referred to, the second plate 22 is calculated according to the first value of thrust and third value of thrust and passes through second
The fillet resistance of determination unit 300；
In the present embodiment, according to formula:
|F3-F1|=Fc
Calculate fillet resistance.Wherein, FC is fillet resistance, and F3 is third value of thrust, and F1 is the first value of thrust.
Step S612 calculates the second plate 22 according to the second value of thrust and the 4th value of thrust and passes through the second determination unit 300
Deformation drag；
In the present embodiment, formula is utilized:
|F4-F2|=FB
Calculate deformation drag, wherein FB is deformation drag, and F4 is the 4th value of thrust, and F2 is the second value of thrust.
It should be appreciated that in other embodiments of the invention, the step in the measuring method of coefficient of friction of the invention
S206 can be exchanged with each other with step S207, can be first carried out step S207 and be executed step S206 again.
Step S613, according to deformation drag and fillet drag evaluation frictional force.
In the present embodiment, according to formula:
|FC-FB|=FR
Frictional force is calculated, wherein FRFor frictional force.
Please continue to refer to Figure 10, step S620, die entrance area coefficient of friction is calculated according to frictional force.
In the present embodiment, formula is utilized:
Calculate die entrance area coefficient of friction.
Wherein u is die entrance area coefficient of friction, and a is folding when second plate 22 passes through the second determination unit 300
Bent angle, FRFor the frictional force, F3For third value of thrust, F1For the first value of thrust.
It should be appreciated that in other embodiments of the invention, the step in the measuring method of coefficient of friction of the invention
S620 can be exchanged with each other with step S610-S613, can be first carried out step S610-S613 and be executed step S620 again.
The working principle of measuring friction coefficient method provided in this embodiment: in the present embodiment, when fixed pin 228 and pin
When hole 134 cooperates, cylindrical mold 222 is static relative to pedestal 100, and traction device 400 pulls the movement of the first plate 21, with band
Dynamic second plate 22 movement.First detection device 210 detects suffered when the first plate 21 is moved relative to cylindrical mold 222
First value of thrust of the first pulling force, second detection device 310 detect the second plate 22 relative to the first Die and mould plate 332 and the second mould
Tool plate 334 moves the third value of thrust of suffered third pulling force.When fixed pin 228 does not cooperate with pin hole 134, cylindrical mold
222 can rotate relative to pedestal 100, and traction device 400 pulls the movement of the first plate 21, to drive the movement of the second plate 22.The
One detection device 210 detects the second pulling force of the second pulling force suffered when the first plate 21 is moved relative to cylindrical mold 222
Value, second detection device 310 detect the second plate 22 moved relative to the first Die and mould plate 332 and the second Die and mould plate 334 it is suffered
4th value of thrust of the 4th pulling force.Flange coefficient of friction is calculated according to third value of thrust or the 4th value of thrust, according to the
One value of thrust, the second value of thrust, third value of thrust and the 4th value of thrust calculate die entrance area coefficient of friction.
In conclusion measuring friction coefficient method provided in this embodiment, in the present embodiment, the first determination unit 200
It is flexibly connected with pedestal 100, applies pressure for the first plate 21, the second determination unit 300 is used to apply pressure for the second plate 22
Power measures opposite first determination unit 200 of the first plate 21 and moves when the first determination unit 200 is opposing stationary with pedestal 100
First value of thrust of the first suffered pulling force；First determination unit 200 measures opposite second determination unit 300 of the second plate 22 and transports
Move the third value of thrust of suffered third pulling force.In the movement of 200 opposite base 100 of the first determination unit, the first plate is measured
21 opposite first determination units 200 move the second value of thrust of the second suffered pulling force, and the second determination unit 300 measures the second plate
Material 22 moves the 4th value of thrust of the 4th suffered pulling force with respect to the second determination unit 300.And according to third value of thrust or
Four value of thrust calculate flange coefficient of friction, according to the first value of thrust, the second value of thrust, third value of thrust and the 4th value of thrust
Calculate die entrance area coefficient of friction.Measuring friction coefficient method provided by the invention can detect that flange rubs simultaneously
Coefficient and die entrance area coefficient of friction, improve the working efficiency of measuring friction coefficient method.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of measuring method of coefficient of friction, described to rub for measuring the coefficient of friction of sheet material to be measured in plate forming process
Wiping coefficient includes flange coefficient of friction and die entrance area coefficient of friction, and the sheet material to be measured includes the first plate interconnected
Material and the second plate, which is characterized in that the measuring friction coefficient device includes pedestal and is respectively arranged on the pedestal
Traction device, the first determination unit and the second determination unit, first determination unit is connect with the base runner, described to rub
Wipe coefficient measuring method include:
First determination unit is fixed, the traction device pulls first plate, to drive second plate to transport
It is dynamic, detect the first value of thrust of first plate, first pulling force suffered relative to first determination unit movement, detection
The third value of thrust of second plate third pulling force suffered relative to the movement of the second determination unit, wherein described first surveys
Order member is supported with first plate, and second determination unit is supported with second plate；
The traction device pulls first plate, so that first determination unit rotates, detects the first plate phase
Second value of thrust of second pulling force suffered for first determination unit movement, detects second plate relative to described
4th value of thrust of the 4th pulling force suffered by second determination unit；
The flange coefficient of friction is calculated according to the third value of thrust；
According to described in the calculating of first value of thrust, second value of thrust, the third value of thrust and the 4th value of thrust
Die entrance area coefficient of friction.
2. the measuring method of coefficient of friction according to claim 1, which is characterized in that second determination unit includes the
One Die and mould plate and the second Die and mould plate, the sheet material to be measured are held between first Die and mould plate and second Die and mould plate, are drawn
Moving second plate can move relative to first Die and mould plate and second Die and mould plate.
3. the measuring method of coefficient of friction according to claim 2, which is characterized in that described according to the third value of thrust
The step of calculating the flange coefficient of friction include:
According to formula:
Calculate the flange coefficient of friction；
Wherein, f is the flange coefficient of friction, F3For the third value of thrust, FNIt is second determination unit to described
The normal pressure of two plates, numerical value 2 are the sum of the quantity of first Die and mould plate and second Die and mould plate.
4. the measuring method of coefficient of friction according to claim 1, which is characterized in that first determination unit includes circle
Cylindrical mould, first plate and the outer surface of the cylindrical mold support.
5. the measuring method of coefficient of friction according to claim 1, which is characterized in that described according to first pulling force
Value, second value of thrust, the third value of thrust and the 4th value of thrust calculate die entrance area coefficient of friction
Step includes:
It calculates and rubs according to first value of thrust, second value of thrust, the third value of thrust and the 4th value of thrust
Wipe power；
Die entrance area coefficient of friction is calculated according to the frictional force.
6. the measuring method of coefficient of friction according to claim 5, which is characterized in that described according to first pulling force
The step of value, second value of thrust, the third value of thrust and the 4th value of thrust calculate frictional force include:
The circle that second plate is moved relative to second determination unit is calculated according to the first value of thrust and third value of thrust
Angle resistance；
The change that second plate is moved relative to second determination unit is calculated according to the second value of thrust and the 4th value of thrust
Form drag；
According to frictional force described in the deformation drag and the fillet drag evaluation.
7. the measuring method of coefficient of friction according to claim 6, which is characterized in that first value of thrust of foundation and
Three value of thrust calculate the step of fillet resistance of second plate by the second determination unit and include:
According to formula:
|F3-F1|=Fc
Calculate the fillet resistance, wherein FCFor fillet resistance, F3For third value of thrust, F1For the first value of thrust.
8. the measuring method of coefficient of friction according to claim 6, which is characterized in that second value of thrust of foundation and
Four value of thrust calculate the step of deformation drag of second plate by second determination unit and include:
According to formula:
|F4-F2|=FB
Calculate the deformation drag, wherein FBFor deformation drag, F4For the 4th value of thrust, F2For the second value of thrust.
9. the measuring method of coefficient of friction according to claim 6, which is characterized in that it is described according to the deformation drag and
The step of frictional force described in the fillet drag evaluation includes:
According to formula:
|FC-FB|=FR
The frictional force is calculated, wherein FBFor deformation drag, FCFor fillet resistance, FRFor frictional force.
10. the measuring method of coefficient of friction according to claim 5, which is characterized in that described according to the frictional force meter
The step of calculating the die entrance area coefficient of friction include:
According to formula:
Die entrance area coefficient of friction is calculated, wherein u is die entrance area coefficient of friction, and a is logical for second plate
Cross bending angle when the second determination unit, FRFor the frictional force, F3For third value of thrust, F1For the first value of thrust.
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| JP3610327B2 (en) * | 2001-09-28 | 2005-01-12 | 三ツ星ベルト株式会社 | Belt friction coefficient measuring device and belt load measuring pulley |
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| CN101865818B (en) * | 2010-05-25 | 2011-11-09 | 桂林电子科技大学 | Measurement method of friction coefficient in pipe plastic deformation |
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