CN205763944U - A kind of chip-breaker cutter - Google Patents
A kind of chip-breaker cutter Download PDFInfo
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- CN205763944U CN205763944U CN201620673004.0U CN201620673004U CN205763944U CN 205763944 U CN205763944 U CN 205763944U CN 201620673004 U CN201620673004 U CN 201620673004U CN 205763944 U CN205763944 U CN 205763944U
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- breaker
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Abstract
A kind of chip-breaker cutter, belongs to machine tool technical field.Cutter head is welded on a jiao of tool matrix, and the size of cutter head is: anterior angle angle A is 5 °～45 °, and stupefied angle B is 45 °～20 °；Chip breaking angle C is 90 °～120 °；Cutting tread a be 0.02～0.15mm, a1 be 0.02mm, a2 be 0.15mm, stupefied width b is 0.02～0.1mm, and chip-breaker width w is 0.1～5mm, w1 be 0.1mm, w2 be 5mm, groove width angle changing D is 15 °～15 °；Chip breaker groove depth h is 0.05～0.45；The cross sectional shape of chip-breaker is circular arc, and the width w of circular arc is gradual change.This utility model advantage is that the matching suitability of chip-breaker blade significantly promotes.User tackles all kinds of chip breaking processing operating mode without the common chip-breaker blade of standby many moneys polytypic.
Description
Technical field
This utility model relates to a kind of chip-breaker cutter, belongs to machine tool technical field.
Background technology
In metal cutting process, whether chip easily snaps off, and the deformation with chip has and directly contacts, so research chip folding
Disconnected principle must be started with from the rule of research chip deformation.
Chip formed in working angles, owing to have passed through bigger plastic deformation, its hardness will carry
Height, plasticity and toughness then significantly reduce, and this phenomenon is flow harden.After flow harden, chip becomes hard and brittle,
It is easy for fractureing when it is by the bending of alternation or shock loading.The plastic deformation that chip is stood is the biggest, and hard crisp phenomenon is more
Significantly, fracture the easiest.When cutting the material of the difficult high intensity of chip breaking, high-ductility, high tenacity, it should manage increase and cut
The deformation of bits, to reduce its plasticity and toughness, it is simple to reach the purpose of chip breaking.
The deformation of chip can be made up of two parts:
Part I is formed in working angles, referred to as basic deformation.During with plane face lathe tool free cutting
Measured chip deformation, is comparatively close to the numerical value of basic deformation.The principal element affecting basic deformation has tool orthogonal rake, bears
Chamfered edge, cutting speed three.Anterior angle is the least, and negative chamfered edge is the widest, cutting speed is the lowest, then the deformation of chip is the biggest, is more conducive to
Chip breaking.So, reduce anterior angle, widen negative chamfered edge, reducing cutting speed can be as the measure promoting chip breaking.
Part II is the deformation that chip is suffered in flowing and curly course, referred to as additional deformation.Because mostly
In the case of number, only the basic deformation in working angles can't make chip breaking, it is necessary to is further added by an additional deformation, ability
Reach hardening and the purpose fractureed.
Chip is forced to stand the easiest method of additional deformation, it is simply that to grind (or suppressing) setting on rake face
The chip-breaker of shape, forces chip to flow into during chip-breaker the most Texturized.Chip stand to add the most Texturized after, further
Hardening and embrittlement, when it collides on workpiece or rear knife face, be just easy to be broken off.
Summary of the invention
In order to overcome the deficiencies in the prior art, this utility model provides a kind of chip-breaker.
A kind of chip-breaker cutter, cutter head is welded on a jiao of tool matrix, and the size of cutter head is:
Anterior angle angle A is 5 °～45 °；
Stupefied angle B is-45 °～20 °；
Chip breaking angle C is 90 °～120 °；
Cutting tread a is 0.02～0.15mm, and cutting tread a1 is 0.02mm, and cutting tread a2 is 0.15mm；
Stupefied width b is 0.02～0.1mm；
Chip-breaker width w is 0.1～5mm, and chip-breaker width w1 is 0.1mm, and chip-breaker width w2 is 5mm；
Groove width angle changing D is-15 °～15 °；
Chip breaker groove depth h is 0.05～0.45；
The cross sectional shape of chip-breaker is circular arc, and the width w of circular arc is gradual change, relevant with the size of w1 and w2, groove
The minimum widith of the end circular arc plane size less than or equal to w1.
A kind of chip-breaker cutter, cutter head is welded on a jiao of tool matrix, and the size of cutter head is:
Anterior angle angle A is 5 °～45 °,
Stupefied angle B is-45 °～20 °
Chip breaking angle C is 90 °～120 °
Groove width angle changing D is-15 °～15 °
Cutting tread a is 0.02～0.15mm, and cutting tread a1 is 0.02mm, and cutting tread a2 is 0.15mm,
Stupefied width b is 0.02～0.1mm,
Chip-breaker width w is 0.1～5mm, and chip-breaker width w1 is 0.1mm, and chip-breaker width w2 is 5mm,
Chip breaker groove depth h is 0.05～0.45mm,
Chip-breaker circular arc degree R is 0.05～10mm；
The cross sectional shape of chip-breaker is trapezoidal, and before cutter, the bottom land to chip-breaker is tapered plane, and bottom land is plane, bottom land
The opposite side of plane is to being tapered plane before another cutter, and the width of bottom land plane is gradual change, relevant with the size of w1 and w2,
The minimum widith of the bottom land plane size less than w1.
A kind of chip-breaker cutter, cutter head is welded on a jiao of tool matrix, and the size of cutter head is:
Anterior angle angle A is 5 °～45 °,
Stupefied angle B is-45 °～20 °
Chip breaking angle C is 90 °～120 °
Groove width angle changing D is-15 °～15 °
Cutting tread a is 0.02～0.15mm,
Stupefied width b is 0.02～0.1mm,
Chip-breaker width w is 0.1～5mm,
Chip breaker groove depth h is 0.05～0.45mm,
Chip-breaker circular arc degree R is 0.05～10mm；
The cross sectional shape of chip-breaker is that circular arc adds inclined-plane, to being tapered plane at the bottom of the arc-shaped slot of chip-breaker before cutter,
Bottom land is circular arc plane, is tapered plane before the opposite side of gullet shape plane to another cutter, gullet shape plane
Width be gradual change, relevant with the size of w1 and w2, the minimum widith of gullet shape plane is less than the size of w1.
A kind of chip-breaker cutter machining method, containing following steps；
Step 1, blade is carried out three-dimensional modeling, determine location reference line and location initial point, from graphics to be processed
Extract the part needing engraving, with the plane of Z=0 for engraving initial sheet, and with the plane mirror image pattern of Z=0；By graphics
Achieve；
Step 2, extraction blade contour line, save as X-Y scheme, positions the demonstration of blade for subsequent step；
Step 3, by step 1 threedimensional model import engraving software, predetermined material monolayer removal amount, and generate laser carving
Carve path；
Step 4, take one piece of identical material the leftover pieces amount of being removed test, draw single layer of material under corresponding carving depth
Removal amount；Leftover pieces are carved chip-breaker, basis of microscopic observation chip-breaker surface quality, after meeting the requirements, carries out next step；
Step 5, on the supporting PC of laser instrument, choose laser path file and contour line file, laser parameter is set；
Step 6, laser dotting, proofread tracking cross so that it is be positioned at LASER SPECKLE center；Blade is placed on positioning fixture
On, laser demonstration contour line, check and correction fixture angle mobile working platform X, Y coordinate makes contour line and blade edge contour convergence；
Step 7, air-flow it is directed at position to be processed and regulates air-flow size, selecting machined parameters, proceed by laser
Processing.
Laser Processing superhard material blade, for ensureing the smooth and bright and clean of machined surface, needs to carry out three processing, for the first time
For high-power roughing machining profile, second time is the floating sidewall of small-power polish；Third time is smeared for the processing of small-power out of focus
Flat bottoms.
The utility model has the advantages that the chip-breaker that continuous parameters changes is that Conventional processing methods cannot be processed；In reality
In the course of processing, chip-breaker blade face is the most unalterable to processing operating mode.Even the processing under fixed work order, along with
The isoparametric change of the amount of feeding, the chip-breaker blade of preset parameter always there will be cannot chip breaking or the problem of chip breaking poor effect.
And this situation can be effectively avoided in the chip-breaker design of this continually varying not preset parameter, make chip-breaker blade
The suitability of joining property significantly promotes.User tackles all kinds of chip breaking processing without the common chip-breaker blade of standby many moneys polytypic
Operating mode.
Accompanying drawing explanation
When considered in conjunction with the accompanying drawings, by referring to detailed description below, it is possible to be more completely more fully understood that this practicality is new
Type and easily learn the advantage that many of which is adjoint, but accompanying drawing described herein be used for providing to of the present utility model enter one
Step understands, constituting a part of the present utility model, schematic description and description of the present utility model is used for explaining this practicality
Novel, it is not intended that improper restriction of the present utility model, such as figure wherein:
Fig. 1 is structural representation of the present utility model.
Fig. 2 is side structure schematic diagram of the present utility model.
Fig. 3 is partial structurtes schematic diagram of the present utility model.
Fig. 4 is one of partial structurtes of the present utility model schematic diagram.
Fig. 5 is two schematic diagrams of partial structurtes of the present utility model.
Fig. 6 is three schematic diagrams of partial structurtes of the present utility model.
With embodiment, this utility model is further illustrated below in conjunction with the accompanying drawings.
Detailed description of the invention
Obviously, the many modifications and variations that those skilled in the art are done based on objective of the present utility model belong to this practicality
Novel protection domain.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singulative used herein " ", "
Individual ", " described " and " being somebody's turn to do " may also comprise plural form.It is to be further understood that description of the present utility model uses
Wording " include " referring to there is described feature, integer, step, operation, element and/or assembly, but it is not excluded that existence or
Add other features one or more, integer, step, operation, element, assembly and/or their group.It should be understood that when us
Claiming element to be " connected " or during " coupled " to another element, it can be directly connected or coupled to other elements, or can also
There is intermediary element.Additionally, " connection " used herein or " coupling " can include wireless connections or couple.Used herein arrange
Diction "and/or" includes one or more any cell listing item being associated and all combinations.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, and all terms used herein (include technology art
Language and scientific terminology) have with the those of ordinary skill in this utility model art be commonly understood by identical meaning.Also
It should be understood that those terms defined in such as general dictionary should be understood that have with in the context of prior art
The consistent meaning of meaning, and unless defined as here, will not explain by idealization or the most formal implication.
For ease of the understanding to this utility model embodiment, below in conjunction with accompanying drawing do as a example by several specific embodiments into
The explanation of one step, and each embodiment is not intended that the restriction to this utility model embodiment.
Embodiment 1: as shown in Figure 1, Figure 2, Figure 3, Figure 4, a kind of chip-breaker cutter, cutter head is welded on the one of tool matrix
Angle, the size of cutter head is:
Anterior angle angle A is 5 °～45 °,
Stupefied angle B is-45 °～20 °
Chip breaking angle C is 90 °～120 °
Cutting tread a be 0.02～0.15mm, a1 be 0.02mm, a2 be 0.15mm,
Stupefied width b is 0.02～0.1mm,
Chip-breaker width w is 0.1～5mm, w1 be 0.1mm, w2 be 5mm,
Groove width angle changing D is-15 °～15 °
Chip breaker groove depth h is 0.05～0.45；
The cross sectional shape of chip-breaker is circular arc, and the width w of circular arc is gradual change, relevant with the size of w1 and w2, groove
The minimum widith of the end circular arc plane size less than or equal to w1.
Embodiment 2: as shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 5,
A kind of chip-breaker cutter, cutter head is welded on a jiao of tool matrix, and the size of cutter head is:
Anterior angle angle A is 5 °～45 °,
Stupefied angle B is-45 °～20 °
Chip breaking angle C is 90 °～120 °
Groove width angle changing D is-15 °～15 °
Cutting tread a be 0.02～0.15mm, a1 be 0.02mm, a2 be 0.15mm,
Stupefied width b is 0.02～0.1mm,
Chip-breaker width w is 0.1～5mm, w1 be 0.1mm, w2 be 5mm,
Chip breaker groove depth h is 0.05～0.45mm,
Chip-breaker circular arc degree R is 0.05～10mm；
The cross sectional shape of chip-breaker is trapezoidal, and before cutter, the bottom land to chip-breaker is tapered plane, and bottom land is plane, bottom land
The opposite side of plane is to being tapered plane before another cutter, and the width of bottom land plane is gradual change, relevant with the size of w1 and w2,
The minimum widith of the bottom land plane size less than w1.
Embodiment 3: as shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 6,
A kind of chip-breaker cutter, cutter head is welded on a jiao of tool matrix, and the size of cutter head is:
Anterior angle angle A is 5 °～45 °,
Stupefied angle B is-45 °～20 °
Chip breaking angle C is 90 °～120 °
Groove width angle changing D is-15 °～15 °
Cutting tread a is 0.02～0.15mm,
Stupefied width b is 0.02～0.1mm,
Chip-breaker width w is 0.1～5mm,
Chip breaker groove depth h is 0.05～0.45mm,
Chip-breaker circular arc degree R is 0.05～10mm；
The cross sectional shape of chip-breaker is that circular arc adds inclined-plane, to being tapered plane at the bottom of the arc-shaped slot of chip-breaker before cutter,
Bottom land is circular arc plane, is tapered plane before the opposite side of gullet shape plane to another cutter, gullet shape plane
Width be gradual change, relevant with the size of w1 and w2, the minimum widith of gullet shape plane is less than the size of w1.
The restriction of the parameters of the technical solution of the utility model and select to be all to have reason but make without foundation
The what is called choice of technology routinely.
The core of the technical solution of the utility model is then that the combined change of the continuous print of these parameters (is different from fixing
Grooved or preset parameter), the high-adaptability that this variability is brought, can preferably adaptation condition, more preferable chip breaking effect.
Embodiment 4: a kind of chip-breaker cutter machining method, containing following steps；
Step 1, blade is carried out three-dimensional modeling, determine location reference line and location initial point, from graphics to be processed
Extract the part needing engraving, with the plane of Z=0 for engraving initial sheet, and with the plane mirror image pattern of Z=0；By graphics
Achieve；
Step 2, extraction chip-breaker contour line, save as X-Y scheme, positions the demonstration of blade for subsequent step；
Step 3, by step 1 threedimensional model import engraving software, predetermined material monolayer removal amount, and generate laser carving
Carve path；
Step 4, take one piece of identical material the leftover pieces amount of being removed test, draw single layer of material under corresponding carving depth
Removal amount；Leftover pieces are carved chip-breaker, basis of microscopic observation chip-breaker surface quality, after meeting the requirements, carries out next step；
Step 5, on the supporting PC of laser instrument, choose laser path file and contour line file, laser parameter is set；
Step 6, laser dotting, proofread tracking cross so that it is be positioned at LASER SPECKLE center；Blade is placed on positioning fixture
On, laser demonstration contour line, check and correction fixture angle mobile working platform X, Y coordinate makes contour line and blade edge contour convergence；
Step 7, air-flow it is directed at position to be processed and regulates air-flow size, selecting machined parameters, proceed by laser
Processing.
Laser Processing superhard material blade, for ensureing the smooth and bright and clean of machined surface, needs to carry out three processing, for the first time
For high-power roughing machining profile, second time is the floating sidewall of small-power polish；Third time is smeared for the processing of small-power out of focus
Flat bottoms.
Machined parameters selects:
The infrared nanosecond laser of 100w selected by laser instrument；
Scan rate of vibrating mirror 200mm/s；
One-level amplifies electric current 30A；
Two grades are amplified electric current 30A；
Repetition rate 100kHz；
Sweep span 10 μm；
Monolayer removal amount 1 μm；
Remove the number of plies 10.
Embodiment 5: a kind of chip-breaker cutter machining method, containing following steps；
Step 1, blade is carried out three-dimensional modeling, determine location reference line and location initial point, from graphics to be processed
Extract the part needing engraving, with the plane of Z=0 for engraving initial sheet, and with the plane mirror image pattern of Z=0；By graphics
Achieve；
Step 2, extraction chip-breaker contour line, save as X-Y scheme, positions the demonstration of blade for subsequent step；
Step 3, by step 1 threedimensional model import engraving software, predetermined material monolayer removal amount, and generate laser carving
Carve path；
Step 4, take one piece of identical material the leftover pieces amount of being removed test, draw single layer of material under corresponding carving depth
Removal amount；Leftover pieces are carved chip-breaker, basis of microscopic observation chip-breaker surface quality, after meeting the requirements, carries out next step；
Step 5, on the supporting PC of laser instrument, choose laser path file and contour line file, laser parameter is set；
Step 6, laser dotting, proofread tracking cross so that it is be positioned at LASER SPECKLE center；Blade is placed on positioning fixture
On, laser demonstration contour line, check and correction fixture angle mobile working platform X, Y coordinate makes contour line and blade edge contour convergence；
Step 7, air-flow it is directed at position to be processed and regulates air-flow size, selecting machined parameters, proceed by laser
Processing.
Laser Processing superhard material blade, for ensureing the smooth and bright and clean of machined surface, needs to carry out three processing, for the first time
For high-power roughing machining profile, second time is the floating sidewall of small-power polish；Third time is smeared for the processing of small-power out of focus
Flat bottoms.
Machined parameters selects: the infrared nanosecond laser of 150w selected by laser instrument；
Scan rate of vibrating mirror 1000mm/s；
One-level amplifies electric current 50A；
Two grades are amplified electric current 50A；
Repetition rate 200kHz；
Sweep span 20 μm；
Monolayer removal amount 20 μm；
Remove the number of plies 50.
Embodiment 6: a kind of chip-breaker cutter machining method, containing following steps；
Step 1, blade is carried out three-dimensional modeling, determine location reference line and location initial point, from graphics to be processed
Extract the part needing engraving, with the plane of Z=0 for engraving initial sheet, and with the plane mirror image pattern of Z=0；By graphics
Achieve；
Step 2, extraction chip-breaker contour line, save as X-Y scheme, positions the demonstration of blade for subsequent step；
Step 3, by step 1 threedimensional model import engraving software, predetermined material monolayer removal amount, and generate laser carving
Carve path；
Step 4, take one piece of identical material the leftover pieces amount of being removed test, draw single layer of material under corresponding carving depth
Removal amount；Leftover pieces are carved chip-breaker, basis of microscopic observation chip-breaker surface quality, after meeting the requirements, carries out next step；
Step 5, on the supporting PC of laser instrument, choose laser path file and contour line file, laser parameter is set；
Step 6, laser dotting, proofread tracking cross so that it is be positioned at LASER SPECKLE center；Blade is placed on positioning fixture
On, laser demonstration contour line, check and correction fixture angle mobile working platform X, Y coordinate makes contour line and blade edge contour convergence；
Step 7, air-flow it is directed at position to be processed and regulates air-flow size, selecting machined parameters, proceed by laser
Processing.
Laser Processing superhard material blade, for ensureing the smooth and bright and clean of machined surface, needs to carry out three processing, for the first time
For high-power roughing machining profile, second time is the floating sidewall of small-power polish；Third time is smeared for the processing of small-power out of focus
Flat bottoms.
Machined parameters selects: the infrared nanosecond laser of 125w selected by laser instrument；
Scan rate of vibrating mirror 600mm/s；
One-level amplifies electric current 35A；
Two grades are amplified electric current 28A；
Repetition rate 160kHz；
Sweep span 15 μm；
Monolayer removal amount 12 μm；
Remove the number of plies 39.
As it has been described above, embodiment of the present utility model is explained, but as long as essentially without disengaging
Inventive point of the present utility model and effect can have a lot of deformation, and this is apparent to one skilled in the art
's.Therefore, within such variation is also integrally incorporated in protection domain of the present utility model.
Claims (3)
1. a chip-breaker cutter, it is characterised in that cutter head is welded on a jiao of tool matrix, the size of cutter head is:
Anterior angle angle A is 5 °～45 °；
Stupefied angle B is-45 °～20 °；
Chip breaking angle C is 90 °～120 °；
Cutting tread a is 0.02～0.15mm, and cutting tread a1 is 0.02mm, and cutting tread a2 is 0.15mm；
Stupefied width b is 0.02～0.1mm；
Chip-breaker width w is 0.1～5mm, and chip-breaker width w1 is 0.1mm, and chip-breaker width w2 is 5mm；
Groove width angle changing D is-15 °～15 °；
Chip breaker groove depth h is 0.05～0.45；
The cross sectional shape of chip-breaker is circular arc, and the width w of circular arc is gradual change, relevant with the size of w1 and w2, bottom land circle
The minimum widith of the arc-plane size less than or equal to w1.
2. a chip-breaker cutter, it is characterised in that cutter head is welded on a jiao of tool matrix, the size of cutter head is:
Anterior angle angle A is 5 °～45 °,
Stupefied angle B is-45 °～20 °
Chip breaking angle C is 90 °～120 °
Groove width angle changing D is-15 °～15 °
Cutting tread a is 0.02～0.15mm, and cutting tread a1 is 0.02mm, and cutting tread a2 is 0.15mm,
Stupefied width b is 0.02～0.1mm,
Chip-breaker width w is 0.1～5mm, and chip-breaker width w1 is 0.1mm, and chip-breaker width w2 is 5mm,
Chip breaker groove depth h is 0.05～0.45mm,
Chip-breaker circular arc degree R is 0.05～10mm；
The cross sectional shape of chip-breaker is trapezoidal, and before cutter, the bottom land to chip-breaker is tapered plane, and bottom land is plane, bottom land plane
Opposite side to being tapered plane before another cutter, the width of bottom land plane is gradual change, relevant with the size of w1 and w2, bottom land
The minimum widith of the plane size less than w1.
3. a chip-breaker cutter, it is characterised in that cutter head is welded on a jiao of tool matrix, the size of cutter head is:
Anterior angle angle A is 5 °～45 °,
Stupefied angle B is-45 °～20 °
Chip breaking angle C is 90 °～120 °
Groove width angle changing D is-15 °～15 °
Cutting tread a is 0.02～0.15mm,
Stupefied width b is 0.02～0.1mm,
Chip-breaker width w is 0.1～5mm,
Chip breaker groove depth h is 0.05～0.45mm,
Chip-breaker circular arc degree R is 0.05～10mm；
The cross sectional shape of chip-breaker is that circular arc adds inclined-plane, to being tapered plane at the bottom of the arc-shaped slot of chip-breaker before cutter, and bottom land
For circular arc plane, it is tapered plane before the opposite side of gullet shape plane to another cutter, the width of gullet shape plane
Degree is gradual change, relevant with the size of w1 and w2, the minimum widith of the gullet shape plane size less than w1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620673004.0U CN205763944U (en) | 2016-06-29 | 2016-06-29 | A kind of chip-breaker cutter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620673004.0U CN205763944U (en) | 2016-06-29 | 2016-06-29 | A kind of chip-breaker cutter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205763944U true CN205763944U (en) | 2016-12-07 |
Family
ID=58129080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620673004.0U Withdrawn - After Issue CN205763944U (en) | 2016-06-29 | 2016-06-29 | A kind of chip-breaker cutter |
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| Country | Link |
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| CN (1) | CN205763944U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105965045A (en) * | 2016-06-29 | 2016-09-28 | 北京沃尔德金刚石工具股份有限公司 | Chip breaking groove cutter and processing method |
| CN110716494A (en) * | 2019-11-13 | 2020-01-21 | 中国航发动力股份有限公司 | Tool parameter identification method and cycloid machining parameter optimization method based on tool parameters |
-
2016
- 2016-06-29 CN CN201620673004.0U patent/CN205763944U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105965045A (en) * | 2016-06-29 | 2016-09-28 | 北京沃尔德金刚石工具股份有限公司 | Chip breaking groove cutter and processing method |
| CN110716494A (en) * | 2019-11-13 | 2020-01-21 | 中国航发动力股份有限公司 | Tool parameter identification method and cycloid machining parameter optimization method based on tool parameters |
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Granted publication date: 20161207 Effective date of abandoning: 20180302 |