CN105136657A - Experimental device and method for obtaining granular material press power and die wall friction force - Google Patents
Experimental device and method for obtaining granular material press power and die wall friction force Download PDFInfo
- Publication number
- CN105136657A CN105136657A CN201510673518.6A CN201510673518A CN105136657A CN 105136657 A CN105136657 A CN 105136657A CN 201510673518 A CN201510673518 A CN 201510673518A CN 105136657 A CN105136657 A CN 105136657A
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- Prior art keywords
- particulate material
- pressed compact
- die wall
- former
- wall friction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/0094—Press load monitoring means
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses an experimental device and method for obtaining granular material press power and die wall friction force, and belongs to the field of experimental mechanics. The experiment comprises an upper die punch, a lower die punch, a female die and a granular material pressing blank. A first pressure sensor is installed on the upper die punch. A second pressure sensor is installed on the lower die punch. The first pressure sensor and the second pressure sensor are connected with a recording instrument through a transmitter. The experimental method comprises the steps that when the granular material pressing blank is pressed, a pressure signal obtained by the first pressure sensor is upward F, a pressure signal obtained by the second pressure sensor is downward F, the transmitter converts the upward F and downward F pressure signals into standard signals of 4-20 mA and transmits the standard signals to the recording instrument, and the recording instrument records the upward F and the downward F in real time. The experimental device and method are used for calibrating a friction coefficient between a die wall and particles in a DEM method.
Description
Technical field
The present invention relates to Experimental Mechanics field, specifically a kind of experimental provision and experimental technique obtaining particulate material press power and die wall friction power.
Background technology
When utilizing DEM (discreteelementmethod, i.e. discrete element) method to carry out the analysis and research of particulate material stressing conditions, need to demarcate the friction factor between particle and die wall, first will obtain the friction force between particle and die wall for this reason.At present, most pressure experiment machine or forming press can only obtain a total force value, this force value accurately have expressed the pressurized situation of mould upper surface particle, cannot send out the friction force mirrored between particle and die wall, also cannot provide the stressing conditions of bottom particle.Therefore, the demarcation that current pressure experiment device cannot realize the friction factor between particle and die wall is utilized.
Summary of the invention
For the problems referred to above, the object of the present invention is to provide a kind of experimental provision and the experimental technique that obtain particulate material press power and die wall friction power, this experimental provision and experimental technique can obtain the press power of press power above particulate material and below, thus obtain the die wall friction power of particulate material, for demarcating the friction factor between particle and die wall in Discrete-parcel method.
The present invention solves the technical scheme that its technical matters takes: the experimental provision obtaining particulate material press power and die wall friction power, comprise upper punch, bottom punch, former and particulate material pressed compact, particulate material pressed compact is inner and between upper punch and bottom punch, described upper punch is provided with the pressure F that the first pressure transducer bears for obtaining particulate material pressed compact upper surface particle at former
on, described bottom punch is provided with the pressure F that the second pressure transducer bears for obtaining particulate material pressed compact bottom particle
under; Described first pressure transducer and the second pressure transducer are by transmitter linkage record instrument, and transmitter is used for converting pressure signal to discernible signal (standard signal as 4-20mA) and by signal transmission to registering instrument, registering instrument realizes F
onand F
underreal time record thus obtain press power above particulate material pressed compact, the press power of below and die wall friction power.
Further technical scheme is: the first described pressure transducer is arranged on the center of upper punch upper surface.
Further technical scheme is: the second described pressure transducer is arranged on the center of bottom punch lower surface.
First pressure transducer is arranged on the center of upper punch upper surface, the second pressure transducer is arranged on the center of bottom punch lower surface.Reduce the error of measurement result, improve the accuracy of measurement result.
Further technical scheme is: described former is provided with the Vertical Channel of up/down perforation, described upper punch, bottom punch and particulate material pressed compact are all positioned at described Vertical Channel, and upper punch, bottom punch and the sidewall of particulate material pressed compact match with the sidewall of Vertical Channel.Upper punch, bottom punch and particulate material pressed compact are all positioned at the Vertical Channel of former, and upper punch, bottom punch and former are suppressed particulate material pressed compact, and structure is very simple, thus the operation of experimental technique and the acquisition of experimental result are all simplified.
Further technical scheme is: described former is arranged on former seat.
Further technical scheme is: described former seat is provided with the groove holding former, former activity is plugged in described groove.
Former seat be set thus make the particle in particulate material pressed compact and the friction force between die wall conduct to former seat through former, then conducting to the lower shoe of experimental provision, thus friction force is delivered to lower shoe cleverly without bottom punch.
Further technical scheme is: described registering instrument is recording instrument without paper.The feature that recording instrument without paper has paperless tests, real-time is good, precision is high, band communicates, can search and intelligentized function, four-way recording instrument without paper generally selected by experimental provision, but only use the two paths of recording instrument without paper when testing at present, therefore also can select binary channels recording instrument without paper.
Further technical scheme is: also comprise demoulding seat, and demoulding seat is used for making the demoulding of described particulate material pressed compact.
Further technical scheme is: described demoulding seat comprises a column, and column is provided with the vertical demoulding passage of up/down perforation.
Demoulding toilet is set in the demoulding of having tested rear pressed compact, after having tested, the mould comprising pressed compact is placed on demoulding seat, then apply pressure and make the pressed compact demoulding.
The present invention solves the technical scheme that its technical matters takes and also comprises: a kind of experimental technique, and described experimental technique comprises: in the process that upper punch, bottom punch and former are suppressed particulate material pressed compact, the pressure signal that the first pressure transducer obtains is F
on, the pressure signal that the second pressure transducer obtains is F
under, transmitter is by F
onand F
underpressure signal change and pass to registering instrument, registering instrument is by F
onand F
underreal time record.
F
onvalue be press power above particulate material pressed compact, F
undervalue be press power below particulate material pressed compact, F
onand F
underdifference be the die wall friction power F of particulate material pressed compact
friction.
The invention has the beneficial effects as follows: the pressurized situation that can not only reflect particulate material pressed compact upper surface particle, the stressing conditions of bottom particle can also be reflected, thus press power above particulate material, the press power of below and die wall friction power can be drawn, for the friction factor demarcated between particle and die wall provides basis.
Accompanying drawing explanation
Fig. 1 is the stressed schematic diagram of particulate material pressed compact in the present invention;
Fig. 2 is the structural representation of experimental provision in embodiment of the present invention pressing stage;
Fig. 3 is the structural representation that experimental provision in the stage mentioned by embodiment of the present invention former;
Fig. 4 is the structural representation of experimental provision in embodiment of the present invention ejection phase.
In figure: 1 particulate material pressed compact, 2 upper punch, 3 first pressure transducers, 4 bottom punches, 5 second pressure transducers, 6 formers, 7 lower shoes, 8 former seats, 9 demoulding seats.
Embodiment
Below in conjunction with Figure of description and specific embodiment, the invention will be further described:
As shown in Figure 2, obtain the experimental provision of particulate material press power and die wall friction power, comprise upper punch 2, bottom punch 4, former 6 and particulate material pressed compact 1, particulate material pressed compact 1 is inner and between upper punch 2 and bottom punch 4, described upper punch 2 is provided with the pressure F that the first pressure transducer 3 bears for obtaining particulate material pressed compact 1 upper surface particle at former 6
on, described bottom punch 4 is provided with the pressure F that the second pressure transducer 5 bears for obtaining particulate material pressed compact 1 bottom particle
under; Described first pressure transducer 3 and the second pressure transducer 5 are by transmitter linkage record instrument, transmitter and registering instrument not shown, transmitter is used for converting pressure signal the standard signal of 4-20mA to and described standard signal being passed to registering instrument, and registering instrument realizes F
onand F
underreal time record thus obtain press power above particulate material pressed compact 1, the press power of below and die wall friction power.
The first described pressure transducer 3 is arranged on the center of upper punch 2 upper surface, and the second described pressure transducer 5 is arranged on the center of bottom punch 4 lower surface, and above-mentioned mounting means can reduce the error of measurement result, improves the accuracy of measurement result.
Described former 6 is provided with the Vertical Channel of up/down perforation, and described upper punch 2, bottom punch 4 and particulate material pressed compact 1 are all positioned at described Vertical Channel, and upper punch 2, bottom punch 4 and the sidewall of particulate material pressed compact 1 match with the sidewall of Vertical Channel.Upper punch 2, bottom punch 4 and particulate material pressed compact 1 are all positioned at the Vertical Channel of former 6, upper punch 2, bottom punch 4 and former 6 pairs of particulate material pressed compacts 1 are suppressed, structure is very simple, thus the operation of experimental technique and the acquisition of experimental result are all simplified.
As Fig. 3, described former 6 is arranged on former seat 8, and described former seat 8 is provided with the groove holding former 6, former 6 activity is plugged in described groove.
Former seat 8 be set thus make the particle in particulate material pressed compact 1 and the friction force between die wall conduct to former seat 8 through former 6, then conducting to the lower shoe 7 of experimental provision, thus friction force is delivered to lower shoe 7 cleverly without bottom punch 4.Simultaneously because the pressure signal detected by the second pressure transducer 5 that friction force not through bottom punch 4, also ensure that on bottom punch 4 is the press power below particulate material pressed compact 1, ensure that the accuracy of experimental result.
Described registering instrument is recording instrument without paper.The feature that recording instrument without paper has paperless tests, real-time is good, precision is high, band communicates, can search and intelligentized function, four-way recording instrument without paper generally selected by experimental provision, but only use the two paths of recording instrument without paper when testing at present, therefore also can select binary channels recording instrument without paper.
As shown in Figure 4, experimental provision also comprises demoulding seat 9, and demoulding seat 9 is for making the demoulding of described particulate material pressed compact 1, and described demoulding seat 9 comprises a column, and column is provided with the vertical demoulding passage of up/down perforation.
The demoulding that demoulding seat 9 is convenient to test rear pressed compact is set, after having tested, the mould comprising pressed compact is placed on demoulding seat 9, then apply pressure and make the pressed compact demoulding.
When above-mentioned experimental provision carries out pressure experiment, three phases can be divided into: pressing stage, former mention stage and ejection phase to the pressing process of particulate material pressed compact 1, as shown in Figure 2, former mentions the stage as shown in Figure 3 to pressing stage, and ejection phase as shown in Figure 4.Particulate material pressed compact 1 in pressing process stressing conditions as shown in Figure 1, described particulate material pressed compact 1 is subject to F
on, F
underand F
frictionthe effect of three power, the pass between three is: F
on=F
under+ F
friction.
Experimental technique comprises: in the process that upper punch 2, bottom punch 4 and former 6 pairs of particulate material pressed compacts 1 are suppressed, and the pressure signal that the first pressure transducer 3 obtains is F
on, the pressure signal that the second pressure transducer 5 obtains is F
under, transmitter is by F
onand F
underpressure signal convert the standard signal of 4-20mA to and described standard signal passed to registering instrument, registering instrument is by F
onand F
underreal time record.
F
onvalue be press power above particulate material pressed compact, F
undervalue be press power below particulate material pressed compact, F
onand F
underdifference be the die wall friction power F of particulate material pressed compact
friction.
In the present embodiment, experimental provision adopts the material experiment-machine of 60 tons, and the first pressure transducer 3 and the second pressure transducer 5 all adopt the pressure transducer of 20 tons.But the specifications and models that the invention is not restricted to described in embodiment, the present invention is applicable to any single action press, simple to operation, accuracy of reading.
The foregoing is only preferred embodiment of the present invention; be not whole embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all; any amendment of doing, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Except technical characteristic described in instructions, all the other technical characteristics are those skilled in the art's known technology, and in order to outstanding innovative characteristics of the present invention, above-mentioned technical characteristic does not repeat them here.
Claims (10)
1. obtain the experimental provision of particulate material press power and die wall friction power, comprise upper punch, bottom punch, former and particulate material pressed compact, particulate material pressed compact is inner and between upper punch and bottom punch at former, it is characterized in that, described upper punch being provided with the pressure F that the first pressure transducer bears for obtaining particulate material pressed compact upper surface particle
on, described bottom punch is provided with the pressure F that the second pressure transducer bears for obtaining particulate material pressed compact bottom particle
under; Described first pressure transducer and the second pressure transducer are by transmitter linkage record instrument, and transmitter is used for converting pressure signal to discernible signal and by signal transmission to registering instrument, registering instrument realizes F
onand F
underreal time record thus obtain press power above particulate material pressed compact, the press power of below and die wall friction power.
2. the experimental provision of acquisition particulate material press power according to claim 1 and die wall friction power, is characterized in that, the first described pressure transducer is arranged on the center of upper punch upper surface.
3. the experimental provision of acquisition particulate material press power according to claim 1 and die wall friction power, is characterized in that, the second described pressure transducer is arranged on the center of bottom punch lower surface.
4. the experimental provision of acquisition particulate material press power according to claim 1 and die wall friction power, it is characterized in that, described former is provided with the Vertical Channel of up/down perforation, described upper punch, bottom punch and particulate material pressed compact are all positioned at described Vertical Channel, and upper punch, bottom punch and the sidewall of particulate material pressed compact match with the sidewall of Vertical Channel.
5. the acquisition particulate material press power according to claim 1 or 4 and the experimental provision of die wall friction power, it is characterized in that, described former is arranged on former seat.
6. the experimental provision of acquisition particulate material press power according to claim 5 and die wall friction power, is characterized in that, described former seat is provided with the groove holding former, former activity is plugged in described groove.
7. the experimental provision of acquisition particulate material press power according to claim 1 and die wall friction power, is characterized in that, described registering instrument is recording instrument without paper.
8. the experimental provision of acquisition particulate material press power according to claim 1 and die wall friction power, is characterized in that, also comprises demoulding seat, and demoulding seat is used for making the demoulding of described particulate material pressed compact.
9. the experimental provision of acquisition particulate material press power according to claim 8 and die wall friction power, is characterized in that, described demoulding seat comprises a column, and column is provided with the vertical demoulding passage of up/down perforation.
10. utilize the experimental provision of the acquisition particulate material press power described in claim 1 and die wall friction power to carry out the experimental technique of pressure experiment, it is characterized in that, in the process that upper punch, bottom punch and former are suppressed particulate material pressed compact, the pressure signal that the first pressure transducer obtains is F
on, the pressure signal that the second pressure transducer obtains is F
under, transmitter is by F
onand F
underpressure signal change and pass to registering instrument, registering instrument is by F
onand F
underreal time record;
F
onvalue be press power above particulate material pressed compact, F
undervalue be press power below particulate material pressed compact, F
onand F
underdifference be the die wall friction power F of particulate material pressed compact
friction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510673518.6A CN105136657B (en) | 2015-10-15 | 2015-10-15 | Obtain the experimental provision and experimental method of granular materials press power and die wall friction power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510673518.6A CN105136657B (en) | 2015-10-15 | 2015-10-15 | Obtain the experimental provision and experimental method of granular materials press power and die wall friction power |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105136657A true CN105136657A (en) | 2015-12-09 |
| CN105136657B CN105136657B (en) | 2018-07-31 |
Family
ID=54722086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510673518.6A Active CN105136657B (en) | 2015-10-15 | 2015-10-15 | Obtain the experimental provision and experimental method of granular materials press power and die wall friction power |
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| Publication number | Publication date |
|---|---|
| CN105136657B (en) | 2018-07-31 |
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