CN206216329U - Spherical coordinates drilling machine - Google Patents
Spherical coordinates drilling machine Download PDFInfo
- Publication number
- CN206216329U CN206216329U CN201621275918.8U CN201621275918U CN206216329U CN 206216329 U CN206216329 U CN 206216329U CN 201621275918 U CN201621275918 U CN 201621275918U CN 206216329 U CN206216329 U CN 206216329U
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- Prior art keywords
- piston
- guide rail
- drilling machine
- ring
- hydraulic cylinder
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Abstract
The utility model discloses a kind of spherical coordinates drilling machine, including：Spherical coordinate device；Two or more fixtures, each described fixture includes：Hydraulic cylinder, it is movably arranged on the circular scale, and the cylinder cap of the hydraulic cylinder is provided with multiple first piston rod through-holes；Piston, it is located in the hydraulic cylinder, can be along being moved back and forth in the hydraulic cylinder, and the piston is provided with multiple second piston rod through-holes；And many piston rods, its upper end extends beyond piston top and extends in the hydraulic cylinder, and lower end is stretched to the hydraulic cylinder cylinder cap extension, and is fitted with the workpiece；And cutting tool assembly.The utility model spherical coordinate drilling machine, the fixture for using has many root piston rods and absorption surface, and the small piston rod that there is boss piston and one end can independently stretch out and retract together, fixture is not limited by workpiece surface shape, can realize automatic fast approaching workpiece, the slow clamping requirement for clamping, quickly removing stage makeup and costume with hydraulic control in addition.
Description
Technical field
The utility model is related to work pieces process machinery equipment, more particularly to a kind of spherical coordinates drilling machine.
Background technology
In spherical work-piece drilling, tapping or make other processing when, in the case of no special fixture, to clamp ball
Shape part is less susceptible to.The processing problems of thin-walled parts, are always more scabrous.Reason is thin-walled parts poor rigidity, by force
Degree is weak, and work in-process level is easily deformed, it is not easy to ensure the crudy of part.Influenceing the factor of thin-walled parts precision has very
It is many, but be summed up main by three below aspect：(1) stress deformation, because workpiece wall is thin, easily produces in the presence of clamping force
Change shape, so as to influence the dimensional accuracy and form accuracy of workpiece.(2) temperature distortion, because workpiece is relatively thin, cutting heat can cause work
Part thermal deformation, is not easily controlled workpiece size.(3) vibration deformation, in the presence of cutting force (particularly radial cutting force),
It is easy to produce vibration and deforms, influences dimensional accuracy, shape, positional precision and the surface roughness of workpiece.For thin-walled work
The shortcomings of part and special-shaped workpiece bore that Milling Machining is difficult, clamping difficulty is big, clamping lifting surface area is small, yielding, easily loosen.
The information for being disclosed in the background section is merely intended to increase the understanding to general background of the present utility model, and
It is not construed as recognizing or implying in any form that the information structure has been existing well known to persons skilled in the art
Technology.
Utility model content
The purpose of this utility model is to provide a kind of spherical coordinates drilling machine, so as to overcome spherical work-piece and thin-wall workpiece to bore
Hole machined is difficult, clamping difficulty is big, clamping lifting surface area is small, yielding, easy loosening shortcoming.
To achieve the above object, the utility model provides a kind of spherical coordinates drilling machine, including：Spherical coordinate device, its
Including circular scale and ring-shaped guide rail, the ring-shaped guide rail can before and after reciprocating rotation on the circular scale,
In the state of being processed, workpiece to be processed is located at the center of the circular scale；Two or more fixtures, often
The individual fixture includes：Hydraulic cylinder, it is movably arranged on the circular scale, and the cylinder cap of the hydraulic cylinder is provided with many
Individual first piston rod through-hole；Piston, it is located in the hydraulic cylinder, can be along being moved back and forth in the hydraulic cylinder, the piston
It is provided with multiple second piston rod through-holes；And many piston rods, its upper end extends beyond the piston top and to the liquid
Extend in cylinder pressure, lower end is stretched to the hydraulic cylinder cylinder cap extension, and is fitted with the workpiece；And cutting tool assembly, it passes through to connect
Fitting is on the ring-shaped guide rail, and the correspondence workpiece setting, and the cutting tool assembly can be moved along the ring-shaped guide rail.
Preferably, in above-mentioned technical proposal, the every piston rod upper end is provided with boss, and the cross-sectional area of the boss is big
In the cross-sectional area of the second piston rod through-hole.
Preferably, in above-mentioned technical proposal, the first piston rod through-hole, the second piston rod through-hole and the piston
The shape of cross section of bar is non-circular.
Preferably, in above-mentioned technical proposal, the circular scale is provided with circular guideway, with it on the circular guideway
The guide block of mutual cooperation, the hydraulic cylinder is on the guide block.
Preferably, in above-mentioned technical proposal, the junction of the guide block and the circular guideway is provided with locking member；The lock
Tight part is camlock block.
Preferably, in above-mentioned technical proposal, the guide block is provided with "T"-shaped groove, and the cross section of the circular guideway is in " T "
Shape structure.
Preferably, in above-mentioned technical proposal, bearing is respectively equipped with the two ends of the ring-shaped guide rail, the bearing is along institute
The diametric(al) for stating circular scale is set, the end of the ring-shaped guide rail on servomotor, the servomotor it is defeated
Shaft is on bearing；Wherein, by reciprocating rotation before and after the rotation drive ring-shaped guide rail of the servomotor.
Preferably, in above-mentioned technical proposal, the connector includes：Tooth bar, it is located on the ring-shaped guide rail；Connection is slided
Block, it is in circular arc, is sheathed on the ring-shaped guide rail, and the cutting tool assembly is located at the lower section of the connection sliding block；Gear, its
By pin on the connection sliding block, the gear is intermeshed with the tooth bar and is driven；And drive mechanism, it is provided with defeated
Shaft, the output shaft is connected with the gear；Wherein, the output shaft rotation is driven by the drive mechanism, it is described defeated
Shaft drives the gear to be intermeshed with the tooth bar and is driven, to drive the connection sliding block to be moved along the ring-shaped guide rail
It is dynamic.
Preferably, in above-mentioned technical proposal, the ring-shaped guide rail is provided with dovetail groove, and the connection sliding block is provided with and institute
State the dovetails of dovetail groove mutual cooperation.
Preferably, in above-mentioned technical proposal, the cutting tool assembly includes：Direct acting sleeve, is internally provided with direct acting motor；With
And cutter mechanism, itself and the direct acting motor connection, the direct acting sleeve is sheathed on the cutter structure upper end, the cutter machine
Structure upper end is provided with graduated scale, in the state of workpiece is processed, by measuring under the cutter mechanism and the direct acting sleeve
The variable quantity of distance is held, the amount of feeding that the cutter mechanism processes workpiece is recorded by the graduated scale.
Compared with prior art, the utility model has the advantages that：The utility model spherical coordinates drilling machine, uses
Fixture have many root small piston rods and absorption surface, considerably increase the contact area of clamping make clamping more stablize, separately may be used
The yielding workpiece such as clamping thin-wall workpieces, and piston and one end small piston rod for having boss can independently stretch out and contract together
Return so that fixture is not limited the abnormal workpieces that can clamp arbitrary surface shape by workpiece surface shape, and hydraulic control is used in addition
It is capable of achieving automatic fast approaching workpiece, the slow clamping requirement for clamping, quickly removing stage makeup and costume.
Brief description of the drawings
Fig. 1 is the structural representation according to spherical coordinates drilling machine of the present utility model.
Fig. 2 is the structural representation according to fixture in spherical coordinates drilling machine of the present utility model.
Fig. 3 is according to holder part structural representation in spherical coordinates drilling machine of the present utility model.
Fig. 4 is the structural representation according to the piston of fixture in spherical coordinates drilling machine of the present utility model.
Fig. 5 is the structural representation according to the piston rod of fixture in spherical coordinates drilling machine of the present utility model.
Fig. 6 is the structural representation according to locking member in spherical coordinates drilling machine of the present utility model.
Fig. 7 is the structural representation according to connector in spherical coordinates drilling machine of the present utility model.
Fig. 8 is the structural representation according to cutting tool assembly in spherical coordinates drilling machine of the present utility model.
Specific embodiment
Below in conjunction with the accompanying drawings, specific embodiment of the present utility model is described in detail, it is to be understood that this practicality
New protection domain is not limited by specific embodiment.
Explicitly indicated that unless otherwise other, otherwise in entire disclosure and claims, term " including " or its change
Change such as "comprising" or " including " etc. and will be understood to comprise stated element or part, and do not exclude other units
Part or other parts.
As shown in Figures 1 to 7, according to a kind of spherical coordinates drilling machine of the utility model specific embodiment, including：It is spherical
Coordinate device 1, fixture 2 and cutting tool assembly 3.Spherical coordinate device 1 includes circular scale 11 and ring-shaped guide rail 12, the annular
Guide rail 12 can before and after reciprocating rotation on the circular scale 11.Cutting tool assembly 3 is located at the annular by connector 4
On guide rail 12, and the correspondence workpiece 5 is set, and total 3 one-tenth of the cutter can be moved along the ring-shaped guide rail 12.Circular scale
11 middle part is provided with workbench, and in the state of being processed, on workbench, i.e., workpiece 5 is located at circle to workpiece 5 to be processed
The center of shape dial 11.Fixture 2 firmly grasps workpiece 5, and workpiece 5 is processed by cutting tool assembly 3.After the completion of clamping, in knife
Required cutter is changed on tool assembly 3, is controlled servomotor cutter is reached in spherical coordinate device by Electronic control and is referred to
Fixed position and can be processed according to the walking of the track of planning.
As shown in Figures 2 to 5, more specifically implementation method is, fixture 2 is two or more fixtures, clamping
When first workpiece is placed in circular scale 11, as needed movable clamp to needed for assigned scale make two or three fixtures
Between 2 into required angle (if using two fixtures clamping into 180 degree, with three fixtures then clamping each other into 120 degree).
The fixture that the present embodiment is used is three, is evenly distributed on circular scale 11.Each fixture 2 includes：Hydraulic cylinder 21, piston
22 and multiple piston rods 23.Piston cylinder 21 is movably arranged on circular scale 11, and the cylinder cap 24 of hydraulic cylinder 21 is provided with many
The first piston rod through-hole 25 that individual cross section is square.Piston 22, can be along back and forth moving in the hydraulic cylinder 21 in hydraulic cylinder 21
Dynamic, piston 22 is provided with the second piston rod through-hole 26 that multiple cross sections are square.Many piston rods 23 lead to First piston bar
Hole 25 and second piston rod through-hole 26 are corresponded and set.The upper end of piston rod 23 extends beyond the top of piston 22 and to hydraulic cylinder
Extend in 21, lower end extends to outside hydraulic cylinder cylinder cap 24.
In the state of to work pieces process, the lower end of piston rod 23 is fitted with workpiece 5, and workpiece 5 is fixed on the table.
During clamping, hydraulic pressure in-cylinder pressure is controlled using hydraulic controller, fast approaching is stretched out in movement simultaneously to make piston 22 and piston rod 23
Workpiece, when piston rod 23 contact workpiece and other piston rods are not in contact with workpiece, the resistance that this root piston rod is given due to workpiece
Power stretches out its stopping, and piston 22 and other piston rods continue to stretch out, until other piston rods all with absorption surface, it does not receive work
The limitation of part surface configuration can clamp the abnormal workpieces of arbitrary surface shape, and now hydraulic pressure in-cylinder pressure can be slowly increased so as to press from both sides
Clamping of workpieces.Conversely, unload workpiece then to be controlled to make the fast retractile of piston 22 with hydraulic controller, piston rod is passed through when piston 22 is retracted
The boss of 23 ends drives piston rod also to bounce back, and workpiece is removed by piston rod all leaves workpiece surface retraction original state.
The fixture for using has many root piston rods and absorption surface, and considerably increasing the contact area of clamping makes clamping more
Stabilization, separately can the yielding workpiece such as clamping thin-wall workpieces, and piston and piston rod can independently stretch out and retract together, make
Obtain fixture and the abnormal workpieces that can clamp arbitrary surface shape are not limited by workpiece surface shape, can be realized with hydraulic control in addition
Automatic fast approaching workpiece, the slow clamping requirement for clamping, quickly removing stage makeup and costume.
Preferably, every piston rod upper end is provided with boss 231, the horizontal stroke of the cross-sectional area more than second piston rod through-hole of boss
Sectional area.There is boss one end of piston rod 23 for withdrawing piston rod 23, piston rod 23 and piston 22 and liquid in return stroke
The cylinder cap 24 of cylinder pressure is to be slidably matched and oil-proof, and the slip of every piston rod is separate.Fixture 2 and work piece interface
Product greatly can the yielding workpiece such as clamping thin-wall workpieces and arbitrary surface shape abnormal workpieces.
Preferably, the shape of cross section of first piston rod through-hole, second piston rod through-hole and piston rod is non-circular.This reality
Example is applied as a example by square.
Preferably, as shown in figure 1, circular scale 11, the circular scale 11 is provided with circular guideway 13, the circle
The guide block 14 cooperated with it on shape guide rail 13, the " T " shape structure in cross section of circular guideway 13, with it on circular guideway 13
The guide block 14 of mutual cooperation, guide block 14 is provided with T-slot, may be such that guide block 14 is more firm with what circular guideway 13 was connected.Liquid
Cylinder pressure 21 is on guide block 14.
Preferably, as shown in fig. 6, the junction of guide block 14 and circular guideway 13 is provided with locking member.Locking member is cam lock
Tight block 6.Camlock block 6 includes cam 61 and handle 62, and cam 62 is rotatably located on guide block 14 by pin, by rotating
Handle 62, guide block 14 can be fixed be locked on circular guideway 13.Guide block 14 can be quickly locked by camlock block 6 to conciliate
Lock guide block.
Preferably, as shown in figure 1, being respectively equipped with bearing 15 at the two ends of the ring-shaped guide rail 12, the ring-shaped guide rail 12
End on the servomotor 16, the bearing 15 is set along the diametric(al) of the circular scale, is welded on circle
On dial.The output shaft of the servomotor is on bearing 15.That is the axis hole coordinated with servomotor 16 on two bearings 15
Center line is on same horizontal line and along the diametric(al) of circular scale 11；The output shaft of servomotor 16 and bearing 15
Axis hole is concentric and is fixed together, and ring-shaped guide rail 12 is fixedly connected on the fuselage of servomotor 16, when startup servomotor, its
Fuselage rotarily drives ring-shaped guide rail 12 around output shaft centre line rotation.The annular is driven to lead by the rotation of the servomotor
Reciprocating rotation before and after rail.
Preferably, as shown in fig. 7, the tooth bar 41 in connector 4 is on the medial surface of ring-shaped guide rail 12；Connection sliding block 42
It is hollow structure, in circular arc, is sheathed on the ring-shaped guide rail 12, the cutting tool assembly 3 is located at the connection sliding block 42
Lower section.By pin 44 located at the upper of connection sliding block 42, gear 43 is located in the cavity of connection sliding block 42 gear 43.Gear 43 and tooth
The intermeshing transmission of bar 41.On connection sliding block 42, drive mechanism 45 is servomotor to drive mechanism 45, is set on servomotor
There is output shaft, output shaft is connected with gear 43.Wherein, output shaft rotation, output shaft drive gear are driven by drive mechanism 45
43 are intermeshed transmission with tooth bar 41, to drive cutting tool assembly 3 to be moved along ring-shaped guide rail 12.
Preferably, ring-shaped guide rail 12 is provided with dovetail groove 121, and connection sliding block 42 is provided with the swallow cooperated with dovetail groove
Tail block 421.May be such that connection sliding block 42 is connected on column 12 more firm.
Preferably, as shown in figure 8, cutting tool assembly 3 includes：Direct acting sleeve 31 and cutter mechanism 32.Inside direct acting sleeve 31
Direct acting motor, cutter mechanism 32 and direct acting motor connection are provided with, direct acting sleeve 31 is sheathed on the upper end of cutter structure 32, cutter mechanism
Upper end is provided with graduated scale 33, in the state of workpiece is processed, by measuring cutter mechanism with direct acting sleeve lower end distance
Variable quantity, the amount of feeding that cutter mechanism processes workpiece is recorded by graduated scale.There is in direct acting sleeve 31 the direct acting motor can be with moving knife
Tool mechanism 32 feeds along spherical coordinates radial direction.The direction of feed axis of cutter mechanism 32, the pivot of ring-shaped guide rail 12
Axis, the clamping center three of fixture 2 intersect at the central point of same point, i.e. spherical coordinates.Then no matter cutter moves to any position
Put, can globally normal direction drilling, moreover it is possible to only by clamped one time just complete many places drill procedure calls, be avoided that because
The mismachining tolerance that clamping brings.
The foregoing description to specific illustrative embodiment of the present utility model be in order to illustrate and illustration purpose.These
Description is not wishing to for the utility model to be defined to disclosed precise forms, and it will be apparent that according to above-mentioned teaching, can carry out
It is many to change and change.The purpose of selecting and describing the exemplary embodiment is that explaining certain principles of the present utility model
And its practical application, so that those skilled in the art can realize and utilize a variety of examples of the present utility model
Property embodiment and a variety of selections and change.Scope of the present utility model is intended to by claims and its waits similar shape
Formula is limited.
Claims (10)
1. a kind of spherical coordinates drilling machine, it is characterised in that including：
Spherical coordinate device, it includes circular scale and ring-shaped guide rail, the ring-shaped guide rail can before and after reciprocating rotation be located at
On the circular scale, in the state of being processed, workpiece to be processed is located at the center of the circular scale；
Two or more fixtures, each described fixture includes：
Hydraulic cylinder, it is movably arranged on the circular scale, and the cylinder cap of the hydraulic cylinder is provided with multiple first pistons
Rod through-hole；
Piston, it is located in the hydraulic cylinder, can be along being moved back and forth in the hydraulic cylinder, and the piston is provided with multiple second
Piston rod through-hole；And
Many piston rods, its upper end extends beyond the piston top and extends in the hydraulic cylinder, and lower end is to the hydraulic pressure
Extend outside cylinder cylinder cap, and fitted with the workpiece；And
Cutting tool assembly, it passes through connector on the ring-shaped guide rail, and the correspondence workpiece setting, and the cutting tool assembly can
Moved along the ring-shaped guide rail.
2. spherical coordinates drilling machine according to claim 1, it is characterised in that the every piston rod upper end is provided with boss,
Cross-sectional area of the cross-sectional area of the boss more than the second piston rod through-hole.
3. spherical coordinates drilling machine according to claim 1, it is characterised in that the first piston rod through-hole, described second
The shape of cross section of piston rod through-hole and the piston rod is non-circular.
4. spherical coordinates drilling machine according to claim 1, it is characterised in that the circular scale is provided with circle and leads
Rail, the guide block cooperated with it on the circular guideway, the hydraulic cylinder is on the guide block.
5. spherical coordinates drilling machine according to claim 4, it is characterised in that the connection of the guide block and the circular guideway
Place is provided with locking member；The locking member is camlock block.
6. spherical coordinates drilling machine according to claim 4, it is characterised in that the guide block is provided with "T"-shaped groove, the circle
The " T " shape structure in cross section of shape guide rail.
7. spherical coordinates drilling machine according to claim 1, it is characterised in that be respectively equipped with the two ends of the ring-shaped guide rail
Bearing, the bearing is set along the diametric(al) of the circular scale, and the end of the ring-shaped guide rail is located at servomotor
On, the output shaft of the servomotor is on bearing；Wherein, the ring-shaped guide rail is driven by the rotation of the servomotor
Front and rear reciprocating rotation.
8. spherical coordinates drilling machine according to claim 1, it is characterised in that the connector includes：
Tooth bar, it is located on the ring-shaped guide rail；
Connection sliding block, it is in circular arc, is sheathed on the ring-shaped guide rail, and the cutting tool assembly is under the connection sliding block
Side；
Gear, it passes through pin on the connection sliding block, and the gear is intermeshed with the tooth bar and is driven；And
Drive mechanism, it is provided with output shaft, and the output shaft is connected with the gear；
Wherein, the output shaft rotation, the output shaft is driven to drive the gear and the tooth bar by the drive mechanism
Intermeshing transmission, to drive the connection sliding block to be moved along the ring-shaped guide rail.
9. spherical coordinates drilling machine according to claim 8, it is characterised in that the ring-shaped guide rail is provided with dovetail groove, institute
State connection sliding block and be provided with the dovetails cooperated with the dovetail groove.
10. spherical coordinates drilling machine according to claim 1, it is characterised in that the cutting tool assembly includes：
Direct acting sleeve, is internally provided with direct acting motor；And
Cutter mechanism, itself and the direct acting motor connection, the direct acting sleeve is sheathed on the cutter structure upper end, the cutter
Mechanism upper end is provided with graduated scale, in the state of workpiece is processed, by measuring the cutter mechanism with the direct acting sleeve
The variable quantity of lower end distance, the amount of feeding that the cutter mechanism processes workpiece is recorded by the graduated scale.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621275918.8U CN206216329U (en) | 2016-11-25 | 2016-11-25 | Spherical coordinates drilling machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621275918.8U CN206216329U (en) | 2016-11-25 | 2016-11-25 | Spherical coordinates drilling machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206216329U true CN206216329U (en) | 2017-06-06 |
Family
ID=58786094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621275918.8U Expired - Fee Related CN206216329U (en) | 2016-11-25 | 2016-11-25 | Spherical coordinates drilling machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206216329U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106541292A (en) * | 2016-11-25 | 2017-03-29 | 广西大学 | Spherical coordinates boring machine |
| CN108637311A (en) * | 2018-05-25 | 2018-10-12 | 吴和明 | A kind of efficient medical gynaecology medical instrument |
| CN108672755A (en) * | 2018-05-25 | 2018-10-19 | 吴和明 | A kind of high-end medical gynaecology's medical instrument |
| CN108941666A (en) * | 2018-05-25 | 2018-12-07 | 吴和明 | A kind of medical treatment gynaecology medical instrument |
| CN109702901A (en) * | 2018-12-29 | 2019-05-03 | 贵州大学 | A kind of drilling machine for laboratory |
| CN112065066A (en) * | 2020-09-07 | 2020-12-11 | 余明昆 | Clamping and positioning mechanism capable of being adjusted in multiple directions for construction engineering |
| CN112157456A (en) * | 2020-10-09 | 2021-01-01 | 许小清 | Workpiece machining clamping mechanism capable of being adjusted in multiple directions |
| CN114769662A (en) * | 2022-05-30 | 2022-07-22 | 温州大学 | Ball perforating device based on visual positioning |
-
2016
- 2016-11-25 CN CN201621275918.8U patent/CN206216329U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106541292A (en) * | 2016-11-25 | 2017-03-29 | 广西大学 | Spherical coordinates boring machine |
| CN108637311A (en) * | 2018-05-25 | 2018-10-12 | 吴和明 | A kind of efficient medical gynaecology medical instrument |
| CN108672755A (en) * | 2018-05-25 | 2018-10-19 | 吴和明 | A kind of high-end medical gynaecology's medical instrument |
| CN108941666A (en) * | 2018-05-25 | 2018-12-07 | 吴和明 | A kind of medical treatment gynaecology medical instrument |
| CN109702901A (en) * | 2018-12-29 | 2019-05-03 | 贵州大学 | A kind of drilling machine for laboratory |
| CN112065066A (en) * | 2020-09-07 | 2020-12-11 | 余明昆 | Clamping and positioning mechanism capable of being adjusted in multiple directions for construction engineering |
| CN112065066B (en) * | 2020-09-07 | 2022-08-12 | 余明昆 | Clamping and positioning mechanism capable of being adjusted in multiple directions for construction engineering |
| CN112157456A (en) * | 2020-10-09 | 2021-01-01 | 许小清 | Workpiece machining clamping mechanism capable of being adjusted in multiple directions |
| CN114769662A (en) * | 2022-05-30 | 2022-07-22 | 温州大学 | Ball perforating device based on visual positioning |
| CN114769662B (en) * | 2022-05-30 | 2023-05-16 | 温州大学 | Ball perforating device based on vision positioning |
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Granted publication date: 20170606 Termination date: 20171125 |