AU2006284201A1 - Method for thickness regulation during a hot-rolling process - Google Patents
Method for thickness regulation during a hot-rolling process Download PDFInfo
- Publication number
- AU2006284201A1 AU2006284201A1 AU2006284201A AU2006284201A AU2006284201A1 AU 2006284201 A1 AU2006284201 A1 AU 2006284201A1 AU 2006284201 A AU2006284201 A AU 2006284201A AU 2006284201 A AU2006284201 A AU 2006284201A AU 2006284201 A1 AU2006284201 A1 AU 2006284201A1
- Authority
- AU
- Australia
- Prior art keywords
- rolling
- gage
- automatic
- accordance
- strip
- 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.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims description 19
- 238000005098 hot rolling Methods 0.000 title claims description 5
- 238000005096 rolling process Methods 0.000 claims description 32
- 238000005259 measurement Methods 0.000 claims description 8
- 238000000926 separation method Methods 0.000 description 10
- 238000013519 translation Methods 0.000 description 4
- 239000008186 active pharmaceutical agent Substances 0.000 description 2
- 238000000418 atomic force spectrum Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000013000 roll bending Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
- B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
- B21B1/34—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by hot-rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2265/00—Forming parameters
- B21B2265/12—Rolling load or rolling pressure; roll force
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2271/00—Mill stand parameters
- B21B2271/02—Roll gap, screw-down position, draft position
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2271/00—Mill stand parameters
- B21B2271/06—Mill spring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/16—Adjusting or positioning rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/16—Adjusting or positioning rolls
- B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
- B21B31/32—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis by liquid pressure, e.g. hydromechanical adjusting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
- B21B37/62—Roll-force control; Roll-gap control by control of a hydraulic adjusting device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
- B21B37/64—Mill spring or roll spring compensation systems, e.g. control of prestressed mill stands
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/08—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring roll-force
Description
VERIFICATION OF TRANSLATION RE: INTERNATIONAL APPLICATION NO. PCT/EP2006/007249 I, Paul J. Collins, c/o Frank C. Farnham Company, Inc., 210 W. Front St., Suite 5, Media, PA 19063-3101, am the translator of the specification of Patent Application No. PCT/EP2006/007249, as well as the replacement pages containing amendments made during the international phase, and I state that said translation is a true translation to the best of my knowledge and belief. Translator: _ _ _ _ _ _ Dated: _ _ _ __ _ TRANSLATION (HM-812PCT-original): WO 2007/022,841 Al PCT/EP2006/007,249 METHOD FOR THICKNESS REGULATION DURING A HOT-ROLLING PROCESS The invention concerns a method for automatic gage control during rolling, especially hot rolling, with at least one rolling stand, where factors that are considered include the present mean position of the adjustment cylinders of the rolling stand and their total rolling force. DE 20 20 402 discloses a method for calculating the gage G1 of a thin, hard workpiece after a reducing pass through a reducing mill train with opposing rolling surfaces and a measuring instrument for measuring the roll separating forces, which are produced during the passage of the workpiece through the opposing rolling surfaces during a reducing operation, in which (a) a signal that is a measure of the gage G5 is generated, which is determined by the point of intersection of an appropriate mill stretch curve and an appropriate workpiece deformation curve for the reducing operation, 1 (b) a signal that is a measure of a gage G3 is generated, which is determined by the point of intersection of the measured force curve and the mill stretch curve, (c) a signal that is a measure of a range of uncertainty is generated, which is determined by the difference between signals representing the gages G5 and G3, (d) a signal that is a measure of a calculated stretch error is generated by varying the signal that represents the range of uncertainty as a function of the draft predicted for the reducing pass, of the mill stretch predicted for the reducing pass, and of the relative probability of error in predicting both draft and mill stretch, and (e) a signal that is a measure of the calculated gage G1 is generated by adding the signal that represents the gage G3 to the calculated stretch error. DE 26 57 455 Al describes a method for compensating roll deformation in rolling stands with prestressing that can be automatically controlled, in which the strip thickness is automatically controlled by hydraulic actuators, and in which the contact force (Fa), which is the sum of the rolling force and the automatically controllable prestressing force according to the following equation: 2 Fa = (Fao + (Fr - Fro)) * Ca/(Ci + Ca), is varied by hydraulic prestressing cylinders in such a way that, to the base set value (Fao) of the contact force, a supplementary set value is added, which is formed from the difference between the actual value (Fr) of the prestressing force and the initial value (Fro) of the prestressing force and is evaluated with the ratio (ca/(ci + ca)) of the spring stiffness (ca) of the outer part of the stand to the sum of the spring stiffness (ci) of the inner part of the stand and the spring stiffness (Ca) of the outer part of the stand. DE 16 02 195 Al discloses a method for calculating the gage of thin, hard workpieces, in which -- a signal that is a measure of the gage G5 is generated, which is determined by the point of intersection of an appropriate mill stretch curve and an appropriate workpiece deformation curve for the reducing operation, -- a signal that is a measure of a gage G3 is generated, which is determined by the point of intersection of the measured force curve and the mill stretch curve, -- a signal that is a measure of a range of uncertainty is generated, which is determined by the difference between signals representing the gages G5 and G3, 3 -- a signal that is a measure of a calculated stretch error is generated by varying the signal that represents the range of uncertainty as a function of the mill stretch predicted for the reducing pass and of the relative probability of error in predicting both draft and mill stretch, and -- a signal that is a measure of the calculated gage G1 is generated by adding the signal that represents the gage G3 to the calculated stretch error. Until now, the so-called gage meter principle for determining the present strip gage has been used for automatic gage control during hot strip rolling. To this end, the measured SDS, Sos of the adjustment cylinders is corrected by the calculated mill stretch g (see also Figure 1). The mill stretch g is calculated with the use of the measured rolling force FDS, Fos and a mill stretch curve I/MG. The strip gage determined in this way is then compared with the gage set value and automatically controlled. Besides the measurements of position and rolling force, an exact mill model is needed for this method. In the rolling of hard materials and thin strip, small inaccuracies in the mill model lead to relatively large errors 4 in the strip gage and sometimes instability of the automatic gage control system. Therefore, the objective of the invention is to improve a method of the type described above in such a way that the disadvantages specified above are avoided. In accordance with the invention, this objective is achieved by minimizing the mill stretch component. This is accomplished by carrying out at least one additional position measurement by detecting position signals in the immediate vicinity of the roll gap of the rolling stands. In this connection, especially the position signals between the work rolls and/or the backup rolls and/or the work roll chocks and/or the backup roll chocks are to be considered/detected. The advantage of the method of the invention is that the position measurement contains a smaller mill stretch component. Thus, only the roll flattening and the roll bending are to be considered. Other components, such as the expansion of the columns and the crossheads, do not have to be considered. Specifically in the measurement of the separation of the work roll chocks, the suspension of the Morgoil bearings, the bending of the backup rolls, and backup roll eccentricities do not have to be taken into consideration. As 5 shown in Figure 2, the prior-art method for automatic gage control is still used in its entirety and is improved or expanded by the features described above. The method of the invention results in a more exact determination of the strip gage in the case of hard materials and, especially in the case of thin strip rolling, improves the dynamic behavior of the automatic gage control system. In a further development of the invention, the signals that are obtained can also be used for automatic position control and/or for automatic swivel control and/or for calculation of the strip gage and thus for automatic control of the strip gage. A specific embodiment of the invention is described in greater detail below with reference to the accompanying schematic drawings. -- Figure 1 shows a flowchart for automatic gage control in accordance with the prior art. -- Figure 2 shows a flowchart for automatic gage control in accordance with the invention. Figure 1 shows a flowchart of prior-art automatic gage control during rolling, especially hot rolling. A rolling stand consisting, for example, of a pair of work rolls AW and 6 a pair of backup rolls SW has an operating side OS and a drive side DS. A strip B is positioned between the pair of work rolls AW. In the previously known method for automatic gage control, the cylinder position of the operating side Sos and the cylinder position of the drive side SDS are determined, and the present mean cylinder position SACT is determined. In addition, the total rolling force FACT is determined by determining the rolling force on the operating side Fos and the rolling force on the drive side FDS. The mill stretch g is calculated with the use of the total rolling force FACT and a mill stretch curve 1/MG. The present strip gage hACT is determined by measurement of the present mean cylinder position SACT and the calculated mill stretch g. The present strip gage hACT is compared with the strip gage set value hREF and used for automatic gage control. The automatic gage controller outputs the position set value for the automatic cylinder position control system. In accordance with the invention, the prior-art automatic control system is improved as shown in the flowchart in Figure 2. To this end, for example, the separation of the work roll chocks on the operating side SROS and on the drive side SRDS is measured, and then the mean separation of the work roll chocks 7 SR is determined. The value for the present mean cylinder position SAy, which continues to be determined, as in the prior art, is directly compared with the cylinder position set value SREF. The values of the rolling force on the operating side Fos and the rolling force on the drive side FDS also continue to be determined and lead to the total rolling force FACT. These are combined, in accordance with the invention, with a mill modulus MR with respect to the work roll chocks, and then the mill stretch gR with respect to the work roll chocks is determined. In accordance with the invention, the mill modulus MR depends on the selected position measurement. The position signals of the position measurement that are to be taken into consideration for the method, with at least one position signal being required, are determined between the work rolls AW and/or the backup rolls SW and/or the work roll chocks and/or the backup roll chocks. The mill stretch to be taken into consideration in the method of the invention is to be coordinated with the given site of the position signal that is obtained. 8 The separation on the operating side SROS and the separation on the drive side SRDS lead to the mean separation of the work roll chocks SR, for example. The present strip gage hACT is determined from the separation of the work roll chocks SR and the mill stretch with respect to the work roll chocks gR and is then compared with the strip gage set value hREF and automatically controlled. 9 List of Reference Symbols AW work roll SW backup roll W rolling stand B strip DS drive side OS operating side FACT total rolling force Fos rolling force on the operating side FDS rolling force on the drive side SACT present mean cylinder position Sos cylinder position on the operating side SDS cylinder position on the drive side SREF cylinder position set value hACT present strip gage hREF strip gage set value SR mean separation of the work roll chocks SRos separation on the operating side SRDS separation on the drive side gR mill stretch with respect to the work roll chocks MR mill model with respect to the work roll chocks g mill stretch MG mill modulus 10
Claims (5)
1. A method for automatic gage control during rolling, especially hot rolling, with at least one rolling stand, where factors that are considered include the present mean position of the adjustment cylinders of the rolling stand and their total rolling force, wherein at least one additional position measurement is carried out by detecting position signals in the immediate vicinity of the roll gap of the rolling stands.
2. A method in accordance with Claim 1, wherein the position signals are detected between the work rolls and/or the backup rolls and/or the work roll chocks and/or the backup roll chocks.
3. A method in accordance with Claim 1 or Claim 2, wherein the position signals are used for automatic position control.
4. A method in accordance with any of Claims 1 to 3, wherein the position signals are used for automatic swivel control.
5. A method in accordance with any of Claims 1 to 4, wherein the position signals are used for calculating the strip gage. 11
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005040690 | 2005-08-26 | ||
DE102005040690.4 | 2005-08-26 | ||
DE102005042837.1 | 2005-09-09 | ||
DE102005042837A DE102005042837A1 (en) | 2005-08-26 | 2005-09-09 | Method for thickness control during hot rolling |
PCT/EP2006/007249 WO2007022841A1 (en) | 2005-08-26 | 2006-07-24 | Method for thickness regulation during a hot-rolling process |
Publications (2)
Publication Number | Publication Date |
---|---|
AU2006284201A1 true AU2006284201A1 (en) | 2007-03-01 |
AU2006284201A2 AU2006284201A2 (en) | 2008-05-01 |
Family
ID=37198982
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU2006284201A Abandoned AU2006284201A1 (en) | 2005-08-26 | 2006-07-24 | Method for thickness regulation during a hot-rolling process |
Country Status (12)
Country | Link |
---|---|
US (1) | US20090031777A1 (en) |
EP (1) | EP1919638A1 (en) |
JP (1) | JP2009505835A (en) |
KR (1) | KR20080037010A (en) |
AU (1) | AU2006284201A1 (en) |
BR (1) | BRPI0615089A2 (en) |
CA (1) | CA2620000A1 (en) |
DE (1) | DE102005042837A1 (en) |
MX (1) | MX2008002631A (en) |
RU (1) | RU2008111505A (en) |
TW (1) | TW200709865A (en) |
WO (1) | WO2007022841A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103706644B (en) * | 2013-12-20 | 2016-04-27 | 秦皇岛首秦金属材料有限公司 | Based on the fixed value of roller slit self-adaptation control method of calibrator detect thickness |
DE102021209714A1 (en) * | 2020-09-22 | 2022-03-24 | Sms Group Gmbh | Device and method for rolling metal strip |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1145836A (en) * | 1966-09-29 | 1969-03-19 | British Iron Steel Research | Improvements in or relating to the rolling of strip |
US3574280A (en) * | 1968-11-12 | 1971-04-13 | Westinghouse Electric Corp | Predictive gauge control method and apparatus with adaptive plasticity determination for metal rolling mills |
FR2263044A1 (en) * | 1974-03-05 | 1975-10-03 | Westinghouse Electric Corp | Automatic thickness control on a four-high rolling mill - using computer to control all the process variables |
US4126027A (en) * | 1977-06-03 | 1978-11-21 | Westinghouse Electric Corp. | Method and apparatus for eccentricity correction in a rolling mill |
US4126026A (en) * | 1977-09-26 | 1978-11-21 | General Electric Company | Method and apparatus for providing improved automatic gage control setup in a rolling mill |
US4909060A (en) * | 1988-01-26 | 1990-03-20 | United Engineering, Inc. | Oil compression compensation system |
US4898012A (en) * | 1988-04-22 | 1990-02-06 | United Engineering, Inc. | Roll bite gauge and profile measurement system for rolling mills |
JPH04100625A (en) * | 1990-08-20 | 1992-04-02 | Sumitomo Metal Ind Ltd | Method for automatically controlling sheet thickness |
DE59505484D1 (en) * | 1994-07-08 | 1999-05-06 | Siemens Ag | Device for detecting the roll gap between two work rolls of a roll stand |
DE69840192D1 (en) * | 1998-02-27 | 2008-12-18 | Nippon Steel Corp | FLAT ROLLING AND BLECH ROLLING |
JP2000288614A (en) * | 1999-04-09 | 2000-10-17 | Toshiba Corp | Gage controller for rolling mill |
FR2860738B1 (en) * | 2003-10-13 | 2006-02-03 | Vai Clecim | METHOD OF INCREASING THE ACCURACY OF PRODUCT TRACK CONTROL IN AN IMBRIC ROLL PLANER MACHINE AND PLANTING INSTALLATION FOR CARRYING OUT THE PROCESS |
DE102004005011B4 (en) * | 2004-01-30 | 2008-10-02 | Betriebsforschungsinstitut VDEh - Institut für angewandte Forschung GmbH | Control method and controller for a rolling stand |
-
2005
- 2005-09-09 DE DE102005042837A patent/DE102005042837A1/en not_active Withdrawn
-
2006
- 2006-07-21 TW TW095126619A patent/TW200709865A/en unknown
- 2006-07-24 US US11/990,529 patent/US20090031777A1/en not_active Abandoned
- 2006-07-24 AU AU2006284201A patent/AU2006284201A1/en not_active Abandoned
- 2006-07-24 MX MX2008002631A patent/MX2008002631A/en not_active Application Discontinuation
- 2006-07-24 WO PCT/EP2006/007249 patent/WO2007022841A1/en active Application Filing
- 2006-07-24 BR BRPI0615089-6A patent/BRPI0615089A2/en not_active Application Discontinuation
- 2006-07-24 KR KR1020087003003A patent/KR20080037010A/en not_active Application Discontinuation
- 2006-07-24 CA CA002620000A patent/CA2620000A1/en not_active Abandoned
- 2006-07-24 JP JP2008527327A patent/JP2009505835A/en not_active Withdrawn
- 2006-07-24 RU RU2008111505/02A patent/RU2008111505A/en not_active Application Discontinuation
- 2006-07-24 EP EP06776361A patent/EP1919638A1/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
CA2620000A1 (en) | 2007-03-01 |
DE102005042837A1 (en) | 2007-03-08 |
RU2008111505A (en) | 2009-10-10 |
AU2006284201A2 (en) | 2008-05-01 |
WO2007022841A1 (en) | 2007-03-01 |
KR20080037010A (en) | 2008-04-29 |
MX2008002631A (en) | 2008-03-14 |
TW200709865A (en) | 2007-03-16 |
US20090031777A1 (en) | 2009-02-05 |
JP2009505835A (en) | 2009-02-12 |
BRPI0615089A2 (en) | 2011-05-03 |
EP1919638A1 (en) | 2008-05-14 |
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Legal Events
Date | Code | Title | Description |
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DA3 | Amendments made section 104 |
Free format text: THE NATURE OF THE AMENDMENT IS AS SHOWN IN THE STATEMENT(S) FILED 11 APR 2008 |
|
MK1 | Application lapsed section 142(2)(a) - no request for examination in relevant period |