CN106977356B - A kind of cylinder test explosive press fitting molding die - Google Patents
A kind of cylinder test explosive press fitting molding die Download PDFInfo
- Publication number
- CN106977356B CN106977356B CN201710304267.3A CN201710304267A CN106977356B CN 106977356 B CN106977356 B CN 106977356B CN 201710304267 A CN201710304267 A CN 201710304267A CN 106977356 B CN106977356 B CN 106977356B
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- Prior art keywords
- pedestal
- sleeve
- circular hole
- outer diameter
- punch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 239000002360 explosive Substances 0.000 title claims abstract description 60
- 238000012360 testing method Methods 0.000 title claims abstract description 26
- 238000000465 moulding Methods 0.000 title claims abstract description 21
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 107
- 238000005422 blasting Methods 0.000 claims abstract description 25
- 239000008187 granular material Substances 0.000 claims abstract description 25
- 238000009423 ventilation Methods 0.000 claims abstract description 25
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 abstract description 17
- 238000000748 compression moulding Methods 0.000 abstract description 7
- 239000000843 powder Substances 0.000 description 11
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000003556 assay Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001739 density measurement Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B21/00—Apparatus or methods for working-up explosives, e.g. forming, cutting, drying
- C06B21/0033—Shaping the mixture
- C06B21/0041—Shaping the mixture by compression
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention discloses a kind of cylinder test explosives to be pressed molding die, including sleeve, punch, blasting explosive granules, pedestal, plug and sealing ring, sleeve is that internal one end is straight hole, and the other end is bell-mouthed cylinder, and punch, blasting explosive granules and pedestal are sequentially installed in sleeve inner；Pedestal is step-like cylinder, and the diametric(al) along pedestal outer diameter small end is machined with ventilation circular hole, is machined with lateral air inlet circular hole compared with the radial direction of big end along pedestal outer diameter, and connect with ventilation circular hole by the axial admission circular hole in base axis direction；Plug is installed in the one end of pedestal axial admission circular hole far from ventilation circular hole.The advantage of the invention is that after blasting explosive granules compression moulding, without applying larger secondary load to punch, shaped charge can slowly be exited, it avoids and moves back shaped charge density deviation predetermined value and shaped charge corner chip off-falling phenomenon in mold process, the precision to promote cylinder test provides technical support.
Description
Technical field
The invention belongs to explosive column field shaping techniques, are related to a kind of explosive press fitting molding die, more particularly to a kind of
Explosive suitable for cylinder test is pressed molding die.
Background technology
Cylinder test is the standardized assays for investigating explosive acting ability, is at home and abroad widely applied, and is tested
Error will directly affect the accuracy of the acting ability and state equation parameter of explosive sample to be assessed, therefore, how reduce circle
The error of cylinder experiment is the hot issue of researcher's concern, wherein the Forming Quality and density of explosive sample are to influence cylinder examination
Test one of the key factor of error.
Explosive press fitting molding has the characteristics that stock utilization is high, process route is simple, with short production cycle, it has also become explosive
One of most important molding mode, however, due to raw material, compacting tool set etc., the powder column after explosive compression moulding is usually
There are different degrees of damages, and then influence the precision of cylinder test result.Such as, Dong Surong et al. exists《Ammunition manufacturing process
It learns》A kind of explosive of (publishing house of Beijing Institute of Technology, 2 months 2014, p338-341) book report is pressed molding die, by rushing
Head, die sleeve, powder column and pedestal composition, explosive press fitting pour into granular loose explosive in the die sleeve of definite shape when being molded,
The powder column for becoming definite shape and intensity by punch pressurization on press, then places below pedestal and moves back mould cylinder, lead to
It crosses pressure secondary to punch and exits powder column.But there are the deficiencies of the following aspects for the mold：1) since pedestal is in punch first
Can occur when secondary pressure it is certain be radially expanded, cause it to be in close contact between die sleeve, in moving back mold process, need to apply punch
Add the larger secondary load could to exit pedestal and shaped charge, several varied powder columns that cause of the axial compressive force that punch applies
Flexible deformation causes shaped charge density to deviate predetermined value so as to cause the variation of shaped charge density；2) due to moving back mold process
In, it needs to apply punch larger secondary load so that the spot speed that pedestal and powder column exit die sleeve is larger, and powder column occurs
Quick elastic expansion deformation, easily makes powder column corner that chip off-falling phenomenon occur.And in cylinder test, sample is by multiple
Press fitting shaped charge is sequentially overlapped in cylinder, and the corner chip off-falling for being pressed powder column makes cylinder side wall expansion consistency become
Difference, or even cylindrical wall is made to rupture in advance；And grain density deviates predetermined value, then so that there is relatively large deviation in later data processing,
Influence the precision of cylinder test result.As it can be seen that existing explosive press fitting molding die is difficult to meet cylinder test for quality of explosive
Requirement.
Invention content
For overcome the deficiencies in the prior art and defect, the present invention provide a kind of cylinder test explosive press fitting shaping mould
Tool, after blasting explosive granules compression moulding, shaped charge, Neng Gouyou can be slowly exited without applying larger secondary load to punch
Effect avoids moving back shaped charge density in mold process and deviates predetermined value and shaped charge corner chip off-falling phenomenon, to promote cylinder test
Precision provide technical support.
A kind of cylinder test provided by the invention is pressed molding die, including sleeve, punch, blasting explosive granules, bottom with explosive
Seat, plug, it is further characterized in that also including sealing ring；The sleeve is that internal one end is straight hole, and the other end is bell-mouthed circle
Cylinder is sequentially installed with punch, blasting explosive granules and pedestal in sleeve inner along close to horn mouth direction；The punch is cylinder
Body, and outer diameter is equal with sleeve straight hole end internal diameter, outer wall and the sleeve straight hole end inner wall H9/g8 clearance fits of punch, in punch
The one end contacted with blasting explosive granules is machined with annular groove, for installing sealing ring；The pedestal is step-like cylinder, bottom
The smaller one end of seat outer diameter is connect with sleeve flared end, and its outer diameter is equal with sleeve straight hole end internal diameter, pedestal outer diameter small end
Outer wall and sleeve straight hole end inner wall H9/g8 clearance fits, the diametric(al) along pedestal outer diameter small end is machined with ventilation circular hole,
And height d of the circular hole at pedestal step that ventilate is less than the height L of sleeve flared end；At the step of pedestal with sleeve loudspeaker
The end face at mouth end is in close contact；It is machined with lateral air inlet circular hole compared with the radial direction of big end along pedestal outer diameter, and passes through datum axle
The axial admission circular hole in line direction is connect with ventilation circular hole；It is machined in the one end of pedestal axial admission circular hole far from ventilation circular hole
Internal thread, for connecting plug；The plug is that diameter small end carries externally threaded round estrade, is connected by external screw thread and pedestal
It connects, for preventing gas leak.
Distance of the annular groove of described punch one end apart from blasting explosive granules upper surface is 1~2cm；Sleeve inner horn mouth
The angle at end is α, and α is 20~40 °；The ratio between sleeve inner flared end height L and sleeve total length are 1：5~7；Base diameter
Height L high 1~2cms of the height H of small end compared with sleeve flared end；Base diameter is big compared with sleeve outer diameter compared with the outer diameter of big end by 1
~2cm；Height d and sleeve flared end height L the ratio between of the pedestal outer diameter small end ventilation circular hole at pedestal step
It is 1~2：3；The pedestal outer diameter small end ventilation circular hole, pedestal outer diameter compared with big end lateral air inlet circular hole and base axis
The diameter of the axial admission circular hole in direction is 0.5~1cm.
After the completion of a kind of cylinder test is pressed each component assembling of molding die with explosive, punch is applied using press axial
Load is moved downward by punch and applies pressure to blasting explosive granules, until removing the load of press after powder column molding；At this point, through
Base diameter is filled with high pressure gas into pedestal compared with the lateral air inlet circular hole of big end, high pressure gas through pedestal axial admission circular hole into
Enter the ventilation circular hole of base diameter small end, finally by ventilation circular hole enter by base diameter small end, pedestal step and
In the confined space that sleeve flared end surrounds；With the continuous entrance of high pressure gas, pressure constantly increases in the confined space,
When the pressure in confined space detaches required pressure higher than pedestal with sleeve, pedestal will be separated from sleeve, and at this time
Still in sleeve, density and shape are not influenced shaped charge by the process.Due between shaped charge and sleeve lining
Frictional force is much smaller than because pedestal is radially expanded the frictional force of generation, thus it is follow-up need to only apply smaller power to punch, can will be at
Type powder column slowly exits, and then can effectively avoid variable density and corner chip off-falling phenomenon of the shaped charge during exiting.
A kind of cylinder test of the present invention is pressed molding die with explosive, and the technique effect brought is embodied in following side
Face：
1) after blasting explosive granules compression moulding, pedestal is made to be detached with sleeve by high pressure gas, when subsequently exiting shaped charge
Without applying larger secondary load to punch, avoids shaped charge density and deviate predetermined value in moving back mold process.
2) because friction is small between shaped charge and sleeve lining, shaped charge can slowly be moved back under smaller pressure
Go out, corner chip off-falling phenomenon of the shaped charge in moving back mold process can be avoided.
Description of the drawings
Fig. 1 is a kind of cylinder test explosive press fitting forming die structure schematic diagram of the present invention.
Fig. 2 is the structural schematic diagram of middle sleeve of the present invention.
Fig. 3 is the structural schematic diagram of punch in the present invention.
Fig. 4 is the structural schematic diagram of pedestal in the present invention.
Label in figure indicates respectively：1, sleeve, 2, punch, 2-1, annular groove, 3, sealing ring, 4, blasting explosive granules, 5,
Pedestal, 5-1, ventilation circular hole, 5-2, axial admission circular hole, 5-3, horizontal communication circular hole, 6, plug.
Specific implementation mode
The present invention is described in further detail with reference to the accompanying drawings and examples, it should be noted that the present invention not office
It is limited to following specific examples, all same transformation carried out on the basis of technical solution of the present invention are in protection scope of the present invention
It is interior.
In compliance with the above technical solution, as Figure 1-Figure 4, the present embodiment provides a kind of cylinder test explosive press fitting molding
Mold, including sleeve 1, punch 2, blasting explosive granules 4, pedestal 5, plug 6, it is further characterized in that also including sealing ring 3；The sleeve
1 for internal one end is straight hole, and the other end is bell-mouthed steel cylinder body, along close to bell-mouthed direction inside sleeve 1
It is sequentially installed with punch 2, blasting explosive granules 4 and pedestal 5；The angle at 1 inside loudspeaker mouth end of sleeve is α, and α values are too big, and pedestal will be fast
Speed pop-up, in fact it could happen that it is dangerous, and equipment is caused to damage, α values are too small, and pedestal can not exit, big according to actually required stress
Small, it is 20~40 ° to be typically chosen α, and the ratio between 1 inside loudspeaker mouth end height L of sleeve and 1 total length of sleeve are 1:5~7；This implementation
In example, the angle [alpha] of sleeve inner flared end is 20 °, and the ratio between sleeve inner flared end height L and sleeve total length are 1：5；
The punch 2 is steel cylinder, and outer diameter is equal with 1 straight hole end internal diameter of sleeve, in the outer wall of punch 2 and 1 straight hole end of sleeve
Wall H9/g8 clearance fits are machined with annular groove 2-1, for installing sealing ring in one end that punch 2 is contacted with blasting explosive granules 4
3；Distances of the annular groove 2-1 apart from 4 upper surface of blasting explosive granules is 1~2cm；In the present embodiment, annular groove 2-1 distances
The distance of 4 upper surface of blasting explosive granules is 1cm；The pedestal 5 be step-like steel cylinder, the smaller one end of 5 outer diameter of pedestal with
1 flared end of sleeve connects, and its outer diameter is equal with 1 straight hole end internal diameter of sleeve, outer wall and the sleeve 1 of 5 outer diameter small end of pedestal
Straight hole end inner wall H9/g8 clearance fits, the height H of 5 diameter small end of pedestal is compared with the height L high 1cm of 1 flared end of sleeve, bottom
It is in close contact with the end face of 1 flared end of sleeve at the step of seat 5, the external world that pedestal 5 is relatively large in diameter end is big compared with the outer diameter of sleeve 1
1cm；Be machined with the ventilation circular hole 5-1 of a diameter of 0.5cm along the diametric(al) of 5 outer diameter small end of pedestal, and ventilate circular hole 5-1 away from
From at 5 step of pedestal height d and the ratio between 1 flared end height L of sleeve be 1~2：3, in the present embodiment, ventilation circular hole 5-1 away from
From at 5 step of pedestal height d and the ratio between 1 flared end height L of sleeve be 1：3；Radial direction along 5 outer diameter of pedestal compared with big end
It is machined with a diameter of 0.5cm transverse directions air inlet circular hole 5-3, and is justified by the axial admission circular hole 5-2 of 5 axis direction of pedestal and ventilation
Hole 5-1 connections, a diameter of 0.5cm of the axial ventilation circular hole 5-2；In 5 axial admission circular hole 5-2 of pedestal far from ventilation circular hole 5-
1 one end is machined with internal thread, for connecting plug 6；The plug 6 is that diameter small end carries externally threaded steel round platform
Body is connect by external screw thread with pedestal 5, for preventing gas from leaking from axial admission circular hole 5-2.
In the present embodiment, the sleeve 1 is that internal one end is straight hole, and the other end is bell-mouthed steel cylinder body, is being covered
Inside cylinder 1 punch 2, blasting explosive granules 4 and pedestal 5, the end of 1 flared end of sleeve are sequentially installed with along close to bell-mouthed direction
It is in close contact at face and the step of pedestal 5；The angle [alpha] at 1 inside loudspeaker mouth end of sleeve is 20 °, 1 inside loudspeaker mouth end height of sleeve
The ratio between L and 1 total length of sleeve are 1：5.
The pedestal is that the pedestal 5 is step-like steel cylinder, the smaller one end of 5 outer diameter of pedestal and 1 loudspeaker of sleeve
The connection of mouth end, and its outer diameter is equal with 1 straight hole end internal diameter of sleeve, outer wall and the 1 straight hole end inner wall of sleeve of 5 outer diameter small end of pedestal
H9/g8 clearance fits, the height H of 5 diameter small end of pedestal compared with 1 flared end of sleeve height L high 1cm, at the step of pedestal 5
It is in close contact with the end face of 1 flared end of sleeve, pedestal 5 is relatively large in diameter the outer diameter big 1cm of the outer diameter compared with sleeve 1 at end；Along pedestal 5
The diametric(al) of outer diameter small end is machined with the ventilation circular hole 5-1 of a diameter of 0.5cm, and circular hole 5-1 is at 5 step of pedestal for ventilation
Height d and the ratio between 1 flared end height L of sleeve be 1：3；It is machined with compared with the radial direction of big end along 5 outer diameter of pedestal a diameter of
The lateral air inlet circular hole 5-3 of 0.5cm, and connect with ventilation circular hole 5-1 by the axial admission circular hole 5-2 of a diameter of 0.5cm；?
The one end of 5 axial admission circular hole 5-2 of pedestal far from ventilation circular hole 5-1 is machined with internal thread, for connecting plug 6.
The application method and operation principle of the present invention is as follows：First, plug 6 is connect by screw thread with pedestal 5, and will set
Cylinder 1 is installed to the smaller one end of 5 internal diameter of pedestal, and ensures that the end face at the step of pedestal 5 with 1 flared end of sleeve closely connects
It touches；Then, it is sequentially placed into blasting explosive granules 4 in sleeve 1 and the punch 1 of sealing ring 3 is installed；After the completion of each component assembling, make
Axial load is applied to punch 2 with press, is moved downward by punch 2 and pressure is applied to blasting explosive granules 4, until blasting explosive granules 4
The load of press is removed after molding；At this point, the lateral air inlet circular hole 5-3 for being relatively large in diameter end through pedestal 5 is filled with high pressure into pedestal 5
Gas, high pressure gas enters the ventilation circular hole 5-1 of 5 diameter small end of pedestal through 5 axial admission circular hole 5-2 of pedestal, finally by leading to
Gas circular hole 5-1 enters in the confined space surrounded by 5 diameter small end of pedestal, 5 step of pedestal and 1 flared end of sleeve；
With the continuous entrance of high pressure gas, pressure constantly increases in the confined space, when the pressure in confined space higher than pedestal 5 with
When sleeve 1 detaches required pressure, pedestal 5 will be separated from sleeve 1, and shaped charge is close still in sleeve at this time
Degree and shape are not influenced by the process.Since the frictional force between 1 inner wall of shaped charge and sleeve is much smaller than because pedestal 5 is radial swollen
The frictional force of swollen generation, therefore follow-up power that only need to be smaller to the application of punch 2, can slowly exit shaped charge, and then can have
Effect avoids variable density and corner chip off-falling phenomenon of the shaped charge in moving back mold process.
Explosive density predetermined value is 1.830g/cm3, through original mold, (Dong Surong et al. exists《Ammunition manufacturing technology》(north
Capital BJ Universithy of Polytech Press, 2 months 2014, p338-341) a kind of explosive of book report is pressed molding die) pressed explosive,
It randomly selects 10 samples and carries out density measurement according to national military standard GJB772A-97 explosive tests method (method 401.2), simultaneously
Using same procedure, the explosive density suppressed through inventive die is measured, test result is as follows table：
From table as can be seen that the degree of the explosive density offset density predetermined value of original mold compression moulding is larger, it is
1.04%；The deviation of explosive density offset predetermined value through inventive die compression moulding is smaller, is 0.11%.
A kind of cylinder test of the present invention is pressed molding die with explosive, after 4 compression moulding of blasting explosive granules, without liquidating
First 2 apply larger secondary load, can slowly exit shaped charge, avoid move back shaped charge density in mold process deviate it is pre-
Definite value and shaped charge corner chip off-falling phenomenon, the precision to promote cylinder test provide technical support.
Claims (4)
1. a kind of cylinder test with explosive be pressed molding die, including sleeve (1), punch (2), blasting explosive granules (4), pedestal (5),
Plug (6), it is further characterized in that also including sealing ring (3)；The sleeve (1) is that internal one end is straight hole, and the other end is loudspeaker
The angle of the cylinder of mouth, sleeve (1) inside loudspeaker mouth end is α, and α is 20~40 °, internal along close to loudspeaker in sleeve (1)
The direction of mouth is sequentially installed with punch (2), blasting explosive granules (4) and pedestal (5)；The punch (2) is cylinder, and outer diameter and set
Cylinder (1) straight hole end internal diameter is equal, outer wall and sleeve (1) the straight hole end inner wall H9/g8 clearance fits of punch (2), punch (2) with
One end of blasting explosive granules (4) contact is machined with annular groove (2-1), for installing sealing ring (3)；The pedestal (5) is step
The cylinder of shape, pedestal (5) smaller one end of outer diameter are connect with sleeve (1) flared end, and in its outer diameter and sleeve (1) straight hole end
Diameter is equal, the outer wall of pedestal (5) outer diameter small end and sleeve (1) straight hole end inner wall H9/g8 clearance fits, pedestal (5) diameter compared with
The height H of small end compared with sleeve (1) flared end height 1~2cm of L long, at the step of pedestal (5) with sleeve (1) flared end
End face be in close contact, be machined with ventilation circular hole (5-1) along the diametric(al) of pedestal (5) outer diameter small end, and the circular hole (5- of ventilating
1) the ratio between the height d at pedestal (5) step and sleeve (1) flared end height L are 1~2：3；Along pedestal (5) outer diameter compared with
The radial direction of big end is machined with lateral air inlet circular hole (5-3), and passes through the axial admission circular hole (5- of pedestal (5) axis direction
2) it is connect with ventilation circular hole (5-1)；It is machined in the one end of pedestal (5) axial admission circular hole (5-2) far from ventilation circular hole (5-1)
Internal thread, for connecting plug (6)；The plug (6) be diameter small end carry externally threaded round estrade, by external screw thread with
Pedestal (5) connects, for preventing gas from leaking from axial admission circular hole (5-2).
2. a kind of cylinder test is pressed molding die with explosive as described in claim 1, which is characterized in that in the sleeve (1)
The ratio between portion flared end length H and sleeve (1) total length are 1：5~7.
3. a kind of cylinder test is pressed molding die with explosive as described in claim 1, which is characterized in that the punch (2)
Distance of the annular groove (2-1) apart from blasting explosive granules (4) upper surface is 1~2cm.
4. a kind of cylinder test is pressed molding die with explosive as described in claim 1, which is characterized in that the pedestal (5) is straight
Diameter is compared with the outer diameter of big end compared with sleeve (1) big 1~2cm of outer diameter；The ventilation circular hole (5-1), pedestal (5) of pedestal (5) outer diameter small end
Outer diameter is compared with the diameter of the lateral air inlet circular hole (5-3) of big end and the axial admission circular hole (5-2) of pedestal (5) axis direction
0.5~1cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710304267.3A CN106977356B (en) | 2017-05-03 | 2017-05-03 | A kind of cylinder test explosive press fitting molding die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710304267.3A CN106977356B (en) | 2017-05-03 | 2017-05-03 | A kind of cylinder test explosive press fitting molding die |
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| Publication Number | Publication Date |
|---|---|
| CN106977356A CN106977356A (en) | 2017-07-25 |
| CN106977356B true CN106977356B (en) | 2018-11-13 |
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| CN201710304267.3A Expired - Fee Related CN106977356B (en) | 2017-05-03 | 2017-05-03 | A kind of cylinder test explosive press fitting molding die |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108707054B (en) * | 2018-05-10 | 2020-07-17 | 西安近代化学研究所 | Prefabricated density gradient explosive molding powder pressing mold |
| CN109187913B (en) * | 2018-08-28 | 2021-05-18 | 西安近代化学研究所 | Simple testing device for cylinder test |
| CN109764770B (en) * | 2019-03-15 | 2020-08-07 | 北京理工大学 | Automatic press-fitting device and method for multi-diameter perforated explosive columns |
| CN112125764B (en) * | 2020-08-28 | 2021-10-08 | 西安近代化学研究所 | Explosive compression molding device |
| CN113790640A (en) * | 2021-09-16 | 2021-12-14 | 太原师范学院 | Fuel press-fitting mold for cylindrical thin-wall structure projectile body and using method thereof |
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| CN103242115B (en) * | 2013-05-14 | 2015-02-04 | 山东圣世达化工有限责任公司 | Water gel and ammonium nitrate fuel oil explosive and production method thereof |
| CN103322869B (en) * | 2013-05-20 | 2015-03-25 | 西安近代化学研究所 | Missile body charge friction environment simulating device |
| CN204694522U (en) * | 2015-06-18 | 2015-10-07 | 西安科技大学 | A kind of pneumatic type concrete sample stripper apparatus |
| CN105928871B (en) * | 2016-05-30 | 2019-10-25 | 北京理工大学 | A kind of packaged explosive friction testing system and its test method |
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