CN1018345B - Method for grinding rolls - Google Patents
Method for grinding rollsInfo
- Publication number
- CN1018345B CN1018345B CN 90101798 CN90101798A CN1018345B CN 1018345 B CN1018345 B CN 1018345B CN 90101798 CN90101798 CN 90101798 CN 90101798 A CN90101798 A CN 90101798A CN 1018345 B CN1018345 B CN 1018345B
- Authority
- CN
- China
- Prior art keywords
- roll
- grinding
- grinding tool
- emery wheel
- mentioned
- 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
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
- B24B5/16—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding peculiarly surfaces, e.g. bulged
- B24B5/167—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding peculiarly surfaces, e.g. bulged for rolls with large curvature radius, e.g. mill rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B28/00—Maintaining rolls or rolling equipment in effective condition
- B21B28/02—Maintaining rolls in effective condition, e.g. reconditioning
- B21B28/04—Maintaining rolls in effective condition, e.g. reconditioning while in use, e.g. polishing or grinding while the rolls are in their stands
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding Of Cylindrical And Plane Surfaces (AREA)
Abstract
A plurality of grinder holders adapted to press grinders mounted to their tip end portions against a roll surface, are arrayed along the axial direction of the roll within a frame which can reciprocate along the roll axis. The grinders are mounted within the holders with their rotary axes inclined in the axial direction of the roll with respect to normal lines of the roll surface. The rotary axes of the grinders are displaced by a given offset amount H with respect to the rotary axis of the roll. The improvements reside in that an inner diameter dG and an outer diameter DG of the grinder and the offset amount H are chosen so as to fulfil the following formulae: 0.1 <= H/DG <= 0.4, and 0.1 <= dG/DG. The grinder roll can be stablished without high frequency vibration and burn in the absence of coercive drive device of grinders.
Description
The grinding attachment of the roll in the present invention relates to rotate, when in rolling work, being worn especially in regard to work roll of milling train etc., the method for grinding of on-stream finishing roll.
In addition, the present invention also is applicable to Ginding process and the work roll of various milling trains and the method for grinding of backing roll in the running of the hold-down roller that is provided with before the downcoiler.
For productivity ratio that improves hot plate mill and the product quality that improves rolled plate, need to develop and produce a kind of being directly installed in the moving commentaries on classics on the milling train, that in the operation of rolling, roller surface is ground to required profile and repair grinding attachment.
An example of grinding method in the running, as shown in Figure 8, one side makes work roll 1 rotation, one side pushes the surface of grinding tools such as non-rotary emery wheel 3 to work roll 1, and by grinding tool is moved along the roll axis direction direction of paper (promptly perpendicular to), and the surfacing of work roll 1 is become required profile.Fig. 9 illustrates another example, promptly in the mode identical with last example work roll 1 pushing of the grinding band 3 in the rotation ' in rotation, and the grinding band is moved along the roll axis direction, thereby realizes the method for grinding.
Figure 10 shows that disclosed roll grinding apparatus of U.S. Patent application US-A4716687 and method, wherein, make the line O of rotating shaft center of grinding tool 3
G, with respect to the line O of rotating shaft center of roll
RThe H distance of setovering like this, even without the pressure drive unit of grinding work 3, also can be carried out grinding by breaker roll 1.
But, the device of the sort of mode of above-mentioned Fig. 8, owing to there is not the rotating driving device of grinding tool 3, thereby it is simple in structure, but its shortcoming is, because of with the surface of work roll 1 contacted grinding tool 3, always same surface, on this surface, can produce emery wheel eyelet clogging, thereby reduce grinding performance.In addition, the square block grinding tool of grinding tool 3 general uses, used device is, this grinding tool along the roll axially-aligned several, strengthen grinding face, improved the device of grinding efficiency, the shortcoming of Cun Zaiing is in this case, and the bight 3a of grinding tool 3 is damaged easily because of the effect that is subjected to grinding resistance.
The grinding attachment of the sort of mode shown in Figure 9, its advantage be, because grinding tool 3 ' rotate, grinding face new in grinding process often contacts with work roll 1, so can prevent obstruction, can keep grinding performance.In addition, this moment is much more general adopt the band grinding tools have as grinding tool 3 ', therefore, can prevent that the bight that above-mentioned square shape grinding tool etc. takes place is damaged., there are more following problems in this mode: because needs setting makes the rotating driving device (not marking among the figure) of grinding tool 3 ' rotation, thereby structure complicated, equipment cost increases; Also because of the fabricating yard area is little, make the maintenance of equipment and inspection very difficult simultaneously, and because the volume of rotating driving device is big, and making bistrique decreased number (general) only with a bistrique, grinding efficiency is low when the whole roll of grinding.
What propose as a kind of method that addresses the above problem is grinding attachment in the on-propelled running shown in Figure 10.The characteristics of this method are that even without the pressure drive unit of grinding tool, grinding tool also can rotate together with roll and carry out grinding, therefore, can obtain stable grinding performance.Yet, in the rolling equipment of reality, when adopting the actual grinding roller of this method, the outer round surface that grinding tool produces dither, grinding performance instability, grinding tool can occur problem damaged and that the scaling loss burning is molten takes place.
The present invention proposes for addressing the above problem, and its purpose is, provides grinding tool in a kind of grinding attachment not produce dither, the stable method of roll grinding of grinding performance in the damaged and scaling loss scorification of grinding tool, the operation process does not take place.
The objective of the invention is to realize by following method step.That is, in can be along roll axis reciprocating framework, arrange along the roll axis direction grinding tool pole that several push the grinding tool installed before it on the roller surface usefulness is set; The configuration mode of above-mentioned grinding tool in above-mentioned pole is, at the normal that makes its rotating shaft with respect to roller surface, when the roll axis direction tilts an angle, also make the rotating shaft of the rotating shaft of above-mentioned grinding tool, the amount of bias that to establish a distance be H with respect to above-mentioned roll; Like this, just can force to drive under the situation of above-mentioned grinding tool not needing, realize the grinding of above-mentioned roll; In this method of roll grinding, with the size G of above-mentioned amount of bias H and above-mentioned grinding tool
G, d
GBetween relation, be set within the scope shown in the following formula.
That is: 0.1≤H/D
G≤ 0.4
0.1≤d
G/D
G
In the formula: the amount of bias between H-grinding tool rotating shaft center's line and the roll rotating shaft center line
d
GThe internal diameter of-grinding tool
D
GThe external diameter of-grinding tool
Role of the present invention is as follows.
With the amount of bias H between grinding tool rotating shaft and the roll rotating shaft, when setting by above-mentioned numerical value, can make the direction of the relative sliding velocity Vs that grinding tool and the contact portion that is ground roll produce, become rational direction, thereby can prevent that grinding tool from producing vibration and damaged.In addition, the internal diameter of grinding tool is designed to above-mentioned numerical value, then can makes the direction of following relative sliding velocity and contact wire inconsistent, thereby can prevent that grinding tool from burn taking place and stop up.
The present invention can obtain following effect.Method for grinding by the present invention's proposition, even grinding tool is not set with forcing rotating driving device, can in machines such as rolling equipment, directly not have yet emery wheel damaged, do not have dither and do not have the stable grinding of burn, thereby can be when improving rolling operating efficiency, and improve the product quality of rolled parts etc.
Being simply described as follows of accompanying drawing.Fig. 1 is the vertical view of roll grinding apparatus one embodiment that the present invention relates to; Fig. 2 is Figure 1A-A line profile; Fig. 3 is the fundamental diagram of the roll grinding apparatus that proposes of the present invention; Fig. 4 is the Principle of Grinding and Cutting key diagram of Fig. 3; Fig. 5 is the grinding test result's of the relation between expression grinding condition and the grinding characteristic a chart; Fig. 6 (A) (B) (C) (D) (E) be the chart of theoretical analysis result one example of the contact condition of expression emery wheel and roll and relative sliding velocity; Fig. 7 (A) (B) (C) is emery wheel amount of bias H and the emery wheel dimension D that the present invention proposes
G, d
GThe key diagram of reasonable relation; Fig. 8, Fig. 9, Figure 10 are existing fundamental diagrams with roll grinding apparatus.
The work roll of 1-milling train;
The backing roll of 2-milling train; 3-grinding tool (emery wheel);
4-grinding tool rotating shaft;
The 5-bearing; 6-grinding tool (emery wheel) pole;
8-grinding tool pushing plunger;
The 9-shell; 10-pressure oil supply hole;
11-grinding tool pole is returned the cylinder chamber;
12-returning pressure oil supply hole;
13-grinding tool lowering or hoisting gear;
14-grinding tool vibrating device;
H-grinding tool (emery wheel) amount of bias;
O
R-work roll axis; O
G-grinding tool (emery wheel) axis;
The contact wire of l-emery wheel and roll;
d
G-grinding tool (emery wheel) internal diameter;
D
G-grinding tool (emery wheel) external diameter.
Further describe as follows by the accompanying drawing illustrated embodiment to formation of the present invention and effect.Fig. 1 represents, with an embodiment of roll grinding apparatus of the present invention, the application on work roll on the four-high mill.Fig. 2 is the profile of A-A line among Fig. 1.
As shown in the figure, this milling train comes roll compacting rolled plate 15 with work roll 1, and strengthens by 2 pairs of work rolls 1 of backing roll.Along the grinding tools 3 such as several circular emery wheels of the axis direction alignment arrangements of work roll 1, respectively by axle 4 and bearing 5, the front end that is supported on each grinding tool pole 6 with freely rotating.In the following description literal, grinding tool is write as emery wheel 3, grinding tool pole 6 is write as emery wheel pole 6.
Each emery wheel pole 6 has all formed plunger, and its rear end is connected with a pressing device 8 that is made of plunger 8a and oil cylinder 8b, and moves forward and backward along arrow x direction and to be inlaid in freely in the shell 9.Each pressing device 8 is installed in the inboard of the bonnet 9a of shell 9, and hydraulic oil 10 enters oil cylinder 8b through the hydraulic control valve (not shown) from the hole, so just can be pressed to emery wheel 3 on the surface of work roll 1 with setting pressure arbitrarily.
On shell 9, be provided with an oil-feed port 12, be used for returning cylinder chamber 11 fuel feeding to emery wheel pole.In addition, when mounted, make the rotation O of each emery wheel 3
G,,, be installed in the shell 9 to any set angle α of roll axis direction inclination with respect to the normal N of work roll outer round surface shown in Figure 1; Also utilize lowering or hoisting gear 13 to make the way of shell 9 liftings simultaneously, can make emery wheel 3 rotation O
G, present or the below-center offset state for work roll axes O R.Illustrated embodiment is the situation when upwards bias set value is H.
Fig. 3 represents the key diagram of the contact condition between grinding tool and the roll, as mentioned above, and as emery wheel rotation O
GTo the work roll axes O
RWhen biasing is arranged, the contact portion between the front end face of grinding medium plain emery wheel 3 and the work roll 1, that is grinding face, shown in Figure 4, be line contact l.
Under this contact condition, when work roll 1 with peripheral speed V
RDuring rotation, 3 on emery wheel is with peripheral speed V
GRotation produces a relative sliding velocity V this moment between emery wheel 3 and roll 1
SThe surface of roll 1 is by this sliding speed V
SBe ground.
The most important thing is during roll dressing, emery wheel N/D and burn, and make grinding performance keep stable.Test by physical device is got clear gradually, in order to achieve the above object, and above-mentioned sliding speed V
SDirection most important.That is to say, emery wheel amount of bias hour, dither and damaged takes place in emery wheel easily, and in contrast, if it is excessive to setover, then emery wheel is burnt easily, and no matter which kind of situation takes place, and all can not carry out normal grinding.
In order to address these problems, real machine test and theoretical analysis result show, in order to guarantee to stablize grinding, in following amount of bias H and emery wheel size-outer diameter D
G, inner diameter d
GBetween exist important relationship.Fig. 5 represents, at the ratio H/D of various amount of bias H(with it and emery wheel external diameter
GPut in order) and the emery wheel internal diameter (with the ratio d of it and emery wheel external diameter
G/ D
GPut in order) situation under, the grinding characteristic during roll dressing that arrangement is come out.The grinding condition of this moment is as follows.
Roll material-Jia nickel mottled cast iron
Roll external diameter-D
W=φ 600mm
Roll speed-800m/min
Emery wheel material-GC320K
Emery wheel external diameter-D
G=φ 240mm
The longitudinal axis of this figure is represented grinding ratio G, and it is defined as follows:
G=(the grinding volume of roll)/(the loss volume of emery wheel)
This grinding ratio G is big more, means that the emery wheel loss is more little, and wheel life is long more.
Therefore, wish under the big condition of grinding ratio G, to carry out grinding, when observing Fig. 5 according to this viewpoint, d
G/ D
GLittle person is good, H/D
GBig person is good.
But, establish d
G/ D
G, that is emery wheel internal diameter hour, burn near emery wheel inner circular part branch, make extremely instability of grinding performance; If d
G/ D
G≤ 0.1 o'clock, no matter with emery wheel amount of bias (H/D
G) be set as any value and all can not prevent burn.
Other direction is as (using H/D with the emery wheel amount of bias among Fig. 5
GExpression) being designed to big value, also can burning, in this case, also is to divide at the emery wheel inner circular part to burn, and wants to prevent burn, must make H/D
G＜0.4.
Will illustrate below why this burn of emery wheel occurs in the inner circular part branch of emery wheel easily? and be subjected to d
GReason with the influence of H.Fig. 6 represents, under various grinding condition, to above-mentioned sliding speed V
SThe vector analysis result.Contact wire l with vector representation emery wheel and roll goes up the sliding speed V of any arbitrarily
S, its direction is along with amount of bias H and emery wheel inner diameter d
GDifference and bigger variation is arranged, this point can be as seen from the figure.That is, at d
G/ D
GUnder the changeless situation ((A) of Fig. 6, (B), (E)), when emery wheel amount of bias H becomes big ((A) → (B) → (E)), the sliding speed V that divides at the inner circular part of emery wheel
SDirection, l coincides with contact wire.Because the heat that grinding generates, savings is at above-mentioned V
SThe part consistent with l, thereby burn.Therefore, in order to prevent the burn of emery wheel, just need make sliding speed V
SDo not overlap with contact wire l, its countermeasure is to set a rational emery wheel amount of bias.
When amount of bias H is immobilized, strengthen the emery wheel inner diameter d gradually
G/ D
GThe time (Fig. 6 (B) → (C) → (D)), by more as can be seen, sliding speed V
SThough direction be not very different, because of the increasing of emery wheel internal diameter, sliding speed V
SThe inside part consistent with contact wire l do not existed, and therefore, the increasing of emery wheel internal diameter is to preventing that the emery wheel burn from being favourable.
From the above-mentioned viewpoint that prevents the emery wheel burn, make H/D
GAs far as possible for a short time suiting, if but too small, dither can take place in emery wheel.Fig. 5 represents, dither and grinding.Relation between the condition.H/D
GLess than 0.1 o'clock easy dither, H/D of taking place
GWhen further diminishing, can cause emery wheel damaged.
The damaged reason of this dither and emery wheel takes place, and also is shown in Fig. 6.Now from sliding speed V
SThe different angle of direction describe as follows.
The reason of dither takes place and is in amount of bias H hour emery wheel easily, because sliding speed V
SDirection, the cause that has a great difference in the interior round side and the cylindrical side of emery wheel.Promptly shown in Fig. 6 (A), when amount of bias H hour, the direction of the sliding speed that inner circular part divides was downward, and the direction of the sliding speed of excircle part makes progress, the direction difference.And for example shown in Fig. 6 (B), (E), when amount of bias H was big, inner circular part divided and the sliding speed of excircle part, and its direction all is downward, as mentioned above, and under the little situation of amount of bias H, owing to sliding speed V
SDirection be opposite in the interior round side of emery wheel with the cylindrical side, become and have a wide reach so act on the direction of the external force (grinding resistance) on the emery wheel rotating shaft, it is complicated that its deformation pattern becomes.Thereby dither takes place easily.
Emery wheel damaged reason easily is, because the relative sliding velocity V of emery wheel excircle part
SDirection be the cause of circular direction outside emery wheel (normal direction).That is to say, arbitrfary point on roll contact wire l, there is a grinding resistance to act on emery wheel along the sliding speed direction, but inner circular part branch at contact wire l, downward resistance does not have any relation to emery wheel is damaged, and in its excircle part, because of the intensity of emery wheel is low, so even less external force is also damaged than being easier to cause.In this case, bear the drag direction of roll, i.e. the direction of sliding speed, at the outer circular direction of emery wheel, easy more generation is damaged.Therefore, damaged in order to prevent emery wheel, should make the direction of sliding speed, to try not towards outer circular direction, its countermeasure is to make H/D
GRationalize very important.
Put the relation between the burn, dither of emery wheel, damaged and emery wheel amount of bias, the emery wheel internal diameter above in order, and its zone of reasonableness has been illustrated in Fig. 7.From Fig. 7 (C) as can be seen, its zone of reasonableness is: 0.1≤H/D
G≤ 0.4,0.1≤d
G/ D.
Claims (1)
1, a kind of method of roll grinding in can be along roll axis reciprocating framework, is arranged along the roll axis direction grinding tool pole that several grinding tools that its front end is installed push usefulness on the roller surface is set; The configuration mode of above-mentioned grinding tool in above-mentioned pole is, make its rotating shaft with respect to the normal of roller surface when the roll axis direction tilts an angle, also make the rotating shaft of above-mentioned grinding tool, with respect to the rotating shaft of the above-mentioned roll amount of bias that a distance is set is H; Can force to drive under the situation of above-mentioned grinding tool not needing thus, realize the grinding of above-mentioned roll; It is characterized in that:
D with above-mentioned biasing H and above-mentioned grinding tool
G, d
GBetween relation, be set within the scope shown in the following formula;
That is 0.1≤H/D,
G≤ 0.4
0.1≤d
G/D
G
In the formula: the amount of bias between H-grinding tool rotating shaft center's line and the roll shaft centerline,
d
GThe internal diameter of-grinding tool,
D
GThe external diameter of-grinding tool.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP126017/89 | 1989-05-19 | ||
| JP89-126017 | 1989-05-19 | ||
| JP1126017A JPH0675730B2 (en) | 1989-05-19 | 1989-05-19 | Roll grinding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1047241A CN1047241A (en) | 1990-11-28 |
| CN1018345B true CN1018345B (en) | 1992-09-23 |
Family
ID=14924663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90101798 Expired CN1018345B (en) | 1989-05-19 | 1990-03-30 | Method for grinding rolls |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0397993A3 (en) |
| JP (1) | JPH0675730B2 (en) |
| CN (1) | CN1018345B (en) |
| AU (1) | AU609005B2 (en) |
| BR (1) | BR9001481A (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100277320B1 (en) | 1992-06-03 | 2001-01-15 | 가나이 쓰도무 | Rolling mill and rolling method with on-line roll grinding device and grinding wheel |
| JP3022702B2 (en) * | 1993-05-27 | 2000-03-21 | 株式会社日立製作所 | Online roll mill |
| DE4409060C3 (en) * | 1994-03-11 | 2000-08-03 | Mannesmann Ag | Device for regrinding built-in rollers |
| DE4422148A1 (en) * | 1994-06-27 | 1996-01-04 | Naxos Union Schleifmittel | Grinding process and equipment for the work rolls of a rolling mill |
| DE19537521C2 (en) * | 1995-09-29 | 1997-09-18 | Mannesmann Ag | Device for regrinding the rolls installed in hot strip mill stands |
| NO961668D0 (en) * | 1996-04-25 | 1996-04-25 | Gisela Berg | Procedure for maintenance of rollers / roll shells |
| JP5334568B2 (en) * | 2008-12-26 | 2013-11-06 | ノードソン コーポレーション | Roll polishing method |
| CN101745849B (en) * | 2010-01-05 | 2012-01-18 | 山西太钢不锈钢股份有限公司 | Assembly method for roll collar grinding frame of grinding machine |
| CN103111920B (en) * | 2011-11-16 | 2015-03-18 | 上海梅山钢铁股份有限公司 | Grinding method of approximate varying contact back-up roll roll-shaped curve by using non numerical control grinding machine |
| CN102554722B (en) * | 2011-12-27 | 2014-04-16 | 深圳市乐普泰科技股份有限公司 | Machining control method and device for rubber roller with elastic layer |
| CN102615560A (en) * | 2012-04-20 | 2012-08-01 | 厦门理工学院 | Online roller grinding method capable of realizing reverse width rolling |
| CN107234132B (en) * | 2016-03-28 | 2019-09-20 | 宝山钢铁股份有限公司 | The production method of high corrosion-resistant secondary cold-rolling chromium plating steel plate |
| CN106078506A (en) * | 2016-07-25 | 2016-11-09 | 唐山钢铁集团有限责任公司 | A kind of roller rotational driving means of roll grinder |
| CN106141827B (en) * | 2016-08-30 | 2018-05-08 | 中冶南方工程技术有限公司 | Roll automatic grinding system |
| CN106553089B (en) * | 2016-11-24 | 2018-08-31 | 南京钢铁股份有限公司 | It is a kind of to use processing method of the plain external grinding machine processing with arc concavity roll |
| CN117697545B (en) * | 2024-01-18 | 2024-05-24 | 石家庄石特轧辊有限公司 | Roller processing and forming equipment |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60184411A (en) * | 1984-03-05 | 1985-09-19 | Nippon Steel Corp | Roll grinding device in rolling installation |
| JPS61235014A (en) * | 1985-04-12 | 1986-10-20 | Mitsubishi Heavy Ind Ltd | Rolling mill grinding device |
| US4716687A (en) * | 1985-02-22 | 1988-01-05 | Mitsubishi Jukogyo Kabushiki Kaisha | Method and apparatus for grinding a rotary body |
| JPS61249609A (en) * | 1985-04-27 | 1986-11-06 | Mitsubishi Heavy Ind Ltd | Grinding method for rotating body |
| JP2580173B2 (en) * | 1987-06-10 | 1997-02-12 | 三菱重工業株式会社 | On-line grinding method for rolling rolls |
| US4989375A (en) * | 1988-05-28 | 1991-02-05 | Noritake Co., Limited | Grinding wheel having high impact resistance, for grinding rolls as installed in place |
-
1989
- 1989-05-19 JP JP1126017A patent/JPH0675730B2/en not_active Expired - Lifetime
-
1990
- 1990-03-22 EP EP19900105460 patent/EP0397993A3/en not_active Withdrawn
- 1990-03-28 AU AU52304/90A patent/AU609005B2/en not_active Ceased
- 1990-03-30 BR BR9001481A patent/BR9001481A/en not_active IP Right Cessation
- 1990-03-30 CN CN 90101798 patent/CN1018345B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| EP0397993A2 (en) | 1990-11-22 |
| AU5230490A (en) | 1990-11-22 |
| CN1047241A (en) | 1990-11-28 |
| AU609005B2 (en) | 1991-04-18 |
| JPH02303612A (en) | 1990-12-17 |
| JPH0675730B2 (en) | 1994-09-28 |
| EP0397993A3 (en) | 1993-01-13 |
| BR9001481A (en) | 1991-04-16 |
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Legal Events
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| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| OR01 | Other related matters | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| C20 | Patent right or utility model deemed to be abandoned or is abandoned |