CN105345937A - Experiment device for manufacturing Brazilian disc Y-shaped crack and operation method of experiment device - Google Patents
Experiment device for manufacturing Brazilian disc Y-shaped crack and operation method of experiment device Download PDFInfo
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- CN105345937A CN105345937A CN201510814067.3A CN201510814067A CN105345937A CN 105345937 A CN105345937 A CN 105345937A CN 201510814067 A CN201510814067 A CN 201510814067A CN 105345937 A CN105345937 A CN 105345937A
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- base
- fixture
- brazilian disc
- cutting blade
- herringbone
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Abstract
The invention discloses an experiment device for manufacturing a Brazilian disc Y-shaped crack and an operation method of the experiment device. The experiment device comprises a machine head, a fixing device, a base and an operation table. The machine head is located at one end of a workbench. A motor is arranged on the machine head. An output shaft of the motor is connected with a connecting rod, and a cutting piece is installed on the connecting rod. The operation table is installed at one end, far away from the machine head, of the workbench in a sliding manner. Operation rods controlling the operation table to move left and right, up and down and front and back are arranged at the side end of the operation table. The base is fixed to the operation table, and a plurality of sets of fixing pieces are oppositely arranged at the upper end of the base. Each set of fixing pieces are parallel in the direction of a radial line and are parallel to the axis direction of the connecting rod. The fixing device is provided with through holes corresponding to the fixing pieces on the base and is fixed to the base through the through holes. The experiment device is easy to operate, high in practicability, accurate in precision and good in application prospect.
Description
Technical field
The invention belongs to technical field of processing equipment, be specifically related to a kind of experimental provision and the method for operating thereof of preparing Brazilian disc herringbone crack.
Background technology
When the fracture characteristics of the quasi-brittle material such as study of rocks, the herringbone crack Brazilian disc that International Rock mechanics association is recommended due to I type can be realized, II type and I, II Mixed Mode Fracture and become one of main test specimen configuration.Whether the machining accuracy in Brazilian disc herringbone crack successfully has a significant impact experiment.But the experimental provision in existing preparation herringbone crack majority can not ensure that two faces of cutting overlap, more can not accurate control critical eigenvalue length.
Summary of the invention
For above-mentioned deficiency of the prior art, the object of this invention is to provide a kind of easy to use, prefabricated fracture surface is smooth, and fracture length is controlled, has experimental provision and the method for the preparation herringbone crack Brazilian disc of degree of precision.
For realizing above-mentioned technical purpose, the technical solution adopted in the present invention is as follows:
Prepare the experimental provision in Brazilian disc herringbone crack, comprise head, fixture, base and operating desk, head is positioned at one end of workbench, and head is provided with motor, and the output shaft of motor is connected with connecting rod, and connecting rod is provided with cutting blade; Operating desk is slidably mounted on workbench one end away from head; The action bars that the side of operating desk is movable up and down about being provided with control operation platform; Base is fixed on operating desk, is relatively set with some groups of fixtures in the upper end of base; Often organize and to be parallel to each other on radial line direction between fixture and all parallel with the axis direction of connecting rod; Fixture is provided with the through hole corresponding with the fixture on base, and is fixed on base by through hole.
Described fixture is processed by macromolecule nylon bar material.Macromolecule nylon bar material has certain toughness, and intensity, also lower than rock material, can avoid metal fixture easily to cause the shortcoming of rock rupture at the two contact surface place when clamping rock.
Described fixture comprises the semicircular ring of two identical band platforms, and semicircular ring is provided with the through hole I corresponding with base upper fixing element, and the end of the semicircular ring of band platform is provided with the through hole II for fixing Brazilian disc.Cylinder on through hole I and the base corresponding with through hole I cooperatively interacts, and can ensure that two cut surfaces obtained can overlap, and ensure the good depth of parallelism when cutting Brazilian disc tow sides.
One end of described connecting rod is threaded with the output shaft of motor, and the other end is provided with the boss for fixing cutting blade, and cutting blade is fixedly mounted on boss, and the output shaft of motor, connecting rod and cutting blade are positioned on same axis.
Boss is provided with external screw thread, and cutting blade to be arranged on boss and locked by nut, and the external screw thread of nut and connecting rod matches.Cutting blade can be locked by boss structure, prevents the effect of skidding in cutting process.
Operating desk is provided with electromagnet.
Described base is metal plate, and be fixed on operating desk by electromagnet, between base and electromagnet face contact and need not by securing members such as screw-nuts, the planar horizontal of the Brazilian disc in the fixture that the level of base plane and then guarantee are arranged on base can be ensured on the one hand, guarantee cutting accurately, on the other hand dismounting and easy for installation.
Described fixture of often organizing includes two cylinders, and between cylinder, interval is arranged, and the axis of cylinder parallels with cutting blade.
Operating desk is provided with the water pipe for cleaning cooling lubrication and water fender, and water pipe is used for cleaning operation platform and lubricates cutting blade and lower the temperature reducing wearing and tearing, and water fender can prevent current splash, ensures the clean hygiene of working environment.
The method of operating of the experimental provision in preparation Brazilian disc herringbone crack is as follows:
The first step, is threaded one end of connecting rod with the output shaft of motor, locked with nut on the boss that cutting blade is arranged on connecting rod;
Second step, puts in the semicircular ring of two band platforms of fixture by Brazilian disc, then bolt is penetrated the through hole II at semicircular ring two ends, pins the semicircular ring of two band platforms at the two ends nut of bolt, realizes fixing Brazilian disc;
3rd step, fixture is enclosed within the cylinder of base by the through hole I on it, makes fixture be fixed on base;
4th step, with three action bars adjustment operating desks, makes the least significant end of cutting blade aim at the center of circle of Brazilian disc;
5th step, the switch opening motor and water pipe starts cutting, controls depth of cut, exit cutting blade fast after reaching depth of cut with upper and lower action bars, closes the switch of motor and water pipe;
6th step, overturns 180 ° by fixture, and is enclosed within cutting base carrying out another face;
7th step, repeats the 5th step, opens motor and conduit switch, controls depth of cut, exit cutting blade fast, complete the cutting of Brazilian disc another side after reaching depth of cut with down operation bar;
8th step, takes off fixture, unclamps nut, takes out the Brazilian disc test specimen containing herringbone crack prepared.
The present invention by three action bars realize operating desk up and down before and after three-dimensional movement, can not only accurately make the center of circle of Brazilian disc corresponding with cutting blade in cutting process, and can also cutting crack time accurate control critical eigenvalue length size.Through-hole structure in the fixture cylindrical fit corresponding with on base uses, Brazilian disc can not only be made to fix well, and the center of circle of need not aliging again when overturning cutting another face of Brazilian disc just can ensure that the position of cutting is positioned at the center of circle, and can ensure that two cut surfaces are in same plane.The present invention is simple to operate, practical, and cutting accurately, and application prospect is good.
Accompanying drawing explanation
Fig. 1 is front view of the present invention.
Fig. 2 is the A-A profile of Fig. 1.
Fig. 3 is the front view of fixture in the present invention.
Fig. 4 is the B-B profile of this Fig. 3.
Fig. 5 is the front view of connecting rod in the present invention.
Fig. 6 is the left view of Fig. 5.
Fig. 7 is the geometric representation that depth of cut of the present invention controls slot length.
What in figure, each mark represented is meant to: 1, head; 2, cutting blade; 3, base; 4, cylinder; 5, operating desk; 6, electromagnet; 7, action bars; 8, water fender; 9, water pipe; 10, motor; 11, connecting rod; 12, fixture; 13, through hole I; 14, through hole II.
Detailed description of the invention
Embodiment: a kind of experimental provision preparing Brazilian disc herringbone crack, comprises head 1, fixture 12, base 3 and operating desk 5.Head 1 is positioned at one end of workbench, head 1 is provided with motor 10, the output shaft of motor 10 is connected with the threaded one end of connecting rod 11, the other end of connecting rod 11 is provided with the boss for fixing cutting blade 2, boss is provided with external screw thread, cutting blade 2 to be arranged on boss and locked by nut, and the external screw thread of nut and connecting rod matches.Cutting blade can be locked by boss structure, prevents the effect of skidding in cutting process.The output shaft of motor 10, connecting rod 11 and cutting blade 2 are positioned on same axis.
Operating desk 5 is arranged on workbench one end away from head 1; The side of operating desk 5 is provided with the action bars 7 that control operation platform 5 moves forward and backward up and down.Described action bars 7 be three respectively about control operation platforms, the movement of up and down and back and forth direction, the principle that action bars controls console 5 movement is identical with the action bars operation principle on RSG-200 grinding machine.Operating desk 5 is provided with electromagnet 6.For the base 3 of metal plate is fixed on operating desk 5 by electromagnet 6, between base 3 and electromagnet 6 face contact and need not by securing members such as screw-nuts, the planar horizontal of the Brazilian disc in the fixture that the level of base plane and then guarantee are arranged on base can be ensured on the one hand, guarantee cutting accurately, on the other hand dismounting and easy for installation.
Some groups of fixtures are relatively set with in the upper end of base 3.Often organize and to be parallel to each other on radial line direction between fixture and all parallel with the axis direction of connecting rod.Described fixture of often organizing includes two cylinders 4, and between cylinder, interval is arranged, and the axis of cylinder 4 parallels with cutting blade 2.
Described fixture 12 is processed by macromolecule nylon bar material, comprise the semicircular ring of two identical band platforms, the semicircular ring of band platform is provided with the through hole I 13 corresponding with base 3 upper fixing element, is provided with the through hole II 14 for fixing Brazilian disc in the end of semicircular ring.Through hole I 13 and the cylinder 4 corresponding with through hole I 13 cooperatively interact, and fixture 12 are fixed on the base 3, ensure that two cut surfaces obtained can overlap, and ensure good planar smoothness when cutting Brazilian disc tow sides.Macromolecule nylon bar material has certain toughness, and intensity, also lower than rock material, can avoid metal fixture when clamping rock easily in the shortcoming broken in the two contact surface place.
Operating desk 5 is provided with the water pipe 9 for cleaning cooling lubrication and water fender 8, and water pipe 9 is for cleaning operation platform and lubricate cutting blade 2 and reduction wearing and tearing of lowering the temperature, and water fender 8 can prevent current splash, ensures the clean hygiene of working environment.
The method of operating of the experimental provision in preparation Brazilian disc herringbone crack is as follows:
The first step, is threaded the output shaft of one end of connecting rod 11 with motor 10, locked with nut on the boss that cutting blade 2 is arranged on connecting rod 11;
Second step, puts into the semicircular ring of two band platforms of fixture 12 by Brazilian disc, then bolt is penetrated the through hole II 14 at semicircular ring two ends, pins the semicircular ring of two band platforms at the two ends nut of bolt, realizes fixing Brazilian disc;
3rd step, fixture 12 is enclosed within the cylinder 4 of base 3 by the through hole I 13 on it, makes fixture 12 fixing on the base 3;
4th step, adjusts operating desk 5 with three action bars 7, makes the least significant end of cutting blade 2 aim at the center of circle of Brazilian disc;
5th step, the switch opening motor 10 and water pipe 9 starts cutting, controls depth of cut, exit cutting blade fast after reaching depth of cut with upper and lower action bars, closes the switch of motor 10 and water pipe 9;
6th step, overturns 180 ° by fixture 12, and is enclosed within cutting base 3 carrying out another face;
7th step, repeats the 5th step, opens motor and conduit switch, controls depth of cut, exit cutting blade fast, complete the cutting of fixture another side after reaching depth of cut with down operation bar;
8th step, takes off fixture, unclamps nut, takes out the Brazilian disc test specimen containing herringbone crack prepared.
In use, feed velocity must be slow, feed place not so can be caused to occur larger breach or damage the blade of cutter.
The present invention can ensure two crack cut surfaces in one plane, and key is the cylinder 4 on the through hole I 13 of fixture and base 3.It is fixing on the base 3 that both support the use the fixture 12 making to be fixed with Brazilian disc, after a face of cutting Brazilian disc, fixture 12 is overturn 180 °, then fixture 12 fixed on the base 3, the position of whole process cutting blade is motionless again.Perpendicular bisector due to cylindrical center's line crosses the center of Brazilian disc, so can not only ensure that home position is constant after upset, and cutting blade is constant relative to the position of Brazilian disc.So the double-edged cut surface of Brazilian disc can overlap.
The method that guarantor's font fracture length of the present invention has degree of precision realizes by accurately controlling depth of cut, and the action bars that depth of cut is moved up and down by control operation platform controls.The action bars of upper and lower function there are dial plate and scale.The drilling depth amount that action bars one encloses is 2mm, and one has 100 scales, and the drilling depth amount of each lattice is 0.02mm.Dial plate can record the number of turns of action bars.Depth of cut controls the geometric representation of slot length as shown in Figure 7, and for CCNBD, the reduction formula of depth of cut and slot length is as follows:
(1)；
(2)；
In formula:
a 1for half of outer crack is long;
a 0for half of internal fissure is long;
rfor the radius of Brazilian disc;
bfor the thickness of Brazilian disc;
r sfor the radius of cutting blade;
dfor depth of cut.
And depth of cut
d=
n+
x× 0.02, wherein
nfor the reading of dial plate,
xfor the scale on action bars.
It is by adopting the cutting blade of different-thickness to realize that the present invention controls herringbone fracture width.This device provides thickness to be the cutting blade of 0.3mm, 0.5mm, 0.6mm, 0.8mm, 1.0mm and 1.2mm, and diameter has 80mm respectively, 100mm and 110mm.After cutting, the width clearance gauge in crack is measured.
Claims (10)
1. prepare the experimental provision in Brazilian disc herringbone crack for one kind, it is characterized in that: comprise head (1), fixture (12), base (3) and operating desk (5), head (1) is positioned at one end of workbench, head 1 is provided with motor (10), the output shaft of motor 10 is connected with connecting rod (11), connecting rod (11) is provided with cutting blade (2); Operating desk (5) is slidably mounted on workbench one end away from head (1); The side of operating desk (5) is provided with control operation platform (5) action bars (7) movable up and down; Base (3) is fixed on operating desk (5), is relatively set with some groups of fixtures in the upper end of base (3); Often organize and to be parallel to each other on radial line direction between fixture and all parallel with the axis direction of connecting rod; Fixture (12) is provided with the through hole (13) corresponding with the fixture on base (3), and is fixed on base (3) by through hole (13).
2. the experimental provision in preparation Brazilian disc herringbone crack according to claim 1, is characterized in that: described fixture (12) is processed by macromolecule nylon bar material.
3. the experimental provision in preparation Brazilian disc herringbone crack according to claim 2, it is characterized in that: described fixture (12) comprises the semicircular ring of two identical band platforms, semicircular ring is provided with the through hole I (13) corresponding with base (3) upper fixing element, the end of the semicircular ring of band platform is provided with the through hole II (14) for fixing Brazilian disc.
4. the experimental provision in the preparation Brazilian disc herringbone crack according to claim 1 or 3, it is characterized in that: one end of described connecting rod (11) is threaded with the output shaft of motor (10), the other end is provided with the boss for fixing cutting blade (2), cutting blade (2) is fixedly mounted on boss, and the output shaft of motor (10), connecting rod (11) and cutting blade (2) are positioned on same axis.
5. the experimental provision in preparation Brazilian disc herringbone crack according to claim 4, is characterized in that: on boss, be provided with external screw thread, and cutting blade (2) to be arranged on boss and locked by nut, and the external screw thread of nut and connecting rod (11) matches.
6. the experimental provision in preparation Brazilian disc herringbone crack according to claim 1, is characterized in that: on operating desk (5), be provided with electromagnet (6).
7. the experimental provision in the preparation Brazilian disc herringbone crack according to claim 1 or 6, is characterized in that: described base (3) is metal plate, and is fixed on operating desk (5) by electromagnet (6).
8. the experimental provision in preparation Brazilian disc herringbone crack according to claim 7, is characterized in that: described fixture of often organizing includes two cylinders (4), and between cylinder (4), interval is arranged, and the axis of cylinder (4) parallels with cutting blade (2).
9. the experimental provision in the preparation Brazilian disc herringbone crack according to claim 1 or 6, it is characterized in that: on operating desk (5), be provided with the water pipe (9) for cleaning cooling lubrication and water fender (8), water pipe (9) is for cleaning operation platform and lubricate cutting blade (2) and reduction wearing and tearing of lowering the temperature.
10. the method for operating of the experimental provision in preparation Brazilian disc herringbone crack according to claim 1 is as follows:
The first step, is threaded the output shaft of one end of connecting rod (11) with motor (10), locked with nut on the boss that cutting blade (2) is arranged on connecting rod (11);
Second step, Brazilian disc is put in the semicircular ring of two band platforms of fixture (12), then bolt is penetrated the through hole II (14) at semicircular ring two ends, pin the semicircular ring of two band platforms at the two ends nut of bolt, realize fixing Brazilian disc;
3rd step, fixture (12) is enclosed within the cylinder of base (3) by the through hole I on it, makes fixture (12) be fixed on base (3);
4th step, with three action bars (7) adjustment operating desk (5), makes the least significant end of cutting blade (2) aim at the center of circle of Brazilian disc;
5th step, the switch opening motor (10) and water pipe (9) starts cutting, controls depth of cut, exit cutting blade fast after reaching depth of cut with upper and lower action bars, closes the switch of motor (10) and water pipe (9);
6th step, by fixture (12) upset 180 °, and is enclosed within cutting base (3) carrying out another face;
7th step, repeats the 5th step, opens the switch of motor (10) and water pipe (9), controls depth of cut, exit cutting blade fast, complete the cutting of Brazilian disc another side after reaching depth of cut with upper and lower action bars;
8th step, takes off fixture (12), unclamps nut, takes out the Brazilian disc test specimen containing herringbone crack prepared.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510814067.3A CN105345937B (en) | 2015-11-23 | 2015-11-23 | Prepare the experimental provision and its operating method in Brazilian disc herringbone crack |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510814067.3A CN105345937B (en) | 2015-11-23 | 2015-11-23 | Prepare the experimental provision and its operating method in Brazilian disc herringbone crack |
Publications (2)
| Publication Number | Publication Date |
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| CN105345937A true CN105345937A (en) | 2016-02-24 |
| CN105345937B CN105345937B (en) | 2017-06-30 |
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| CN201510814067.3A Expired - Fee Related CN105345937B (en) | 2015-11-23 | 2015-11-23 | Prepare the experimental provision and its operating method in Brazilian disc herringbone crack |
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Cited By (3)
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| CN105758693A (en) * | 2016-04-29 | 2016-07-13 | 河南理工大学 | Experimental device and method for forming fractures and center circular hole in disc rock sample |
| CN105865872A (en) * | 2016-04-29 | 2016-08-17 | 河南理工大学 | Experimental device and method for making cracks different in angle with axial direction of standard rock sample |
| CN106370490A (en) * | 2016-08-29 | 2017-02-01 | 中国航空工业集团公司西安飞机设计研究所 | Test-piece initial crack duplicating device and method |
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| CN205148641U (en) * | 2015-11-23 | 2016-04-13 | 河南理工大学 | Experimental device for prepare brazilian disc chevron shape crack |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105758693A (en) * | 2016-04-29 | 2016-07-13 | 河南理工大学 | Experimental device and method for forming fractures and center circular hole in disc rock sample |
| CN105865872A (en) * | 2016-04-29 | 2016-08-17 | 河南理工大学 | Experimental device and method for making cracks different in angle with axial direction of standard rock sample |
| CN105758693B (en) * | 2016-04-29 | 2018-07-17 | 河南理工大学 | A kind of experimental provision and method making crack and center hole on disk rock sample |
| CN105865872B (en) * | 2016-04-29 | 2018-08-24 | 河南理工大学 | It prepares and the axial experimental provision and method at different angle crack of Standard rock sample |
| CN106370490A (en) * | 2016-08-29 | 2017-02-01 | 中国航空工业集团公司西安飞机设计研究所 | Test-piece initial crack duplicating device and method |
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| CN105345937B (en) | 2017-06-30 |
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