CN102489823A - Flame cutting method of ultra-long single-sided rack - Google Patents
Flame cutting method of ultra-long single-sided rack Download PDFInfo
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- CN102489823A CN102489823A CN201110384609XA CN201110384609A CN102489823A CN 102489823 A CN102489823 A CN 102489823A CN 201110384609X A CN201110384609X A CN 201110384609XA CN 201110384609 A CN201110384609 A CN 201110384609A CN 102489823 A CN102489823 A CN 102489823A
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Abstract
The invention provides a flame cutting method of an ultra-long single-sided rack, which comprises the following steps of: A. preheating a whole steel plate to 200 to 300 DEG C; B. fixing the preheated steel plate on a cutting platform: C. measuring the temperature of the steel plate, and starting to simultaneously cut along two cutting tracks 1 when the temperature of the steel plate is between 100 and 150 DEG C; and D. cutting along cutting tracks 2 to complete the rack cutting. According to the flame cutting method of the ultra-long single-sided rack, the whole steel plate is preheated, the steel plate is kept at best cutting temperature and in a best cutting state, a flank profile is simultaneously cut from two sides, and the steel plate is divided into two single-sided racks from the middle straight line, so that the preheating speed of a piece to be cut is quick, the operation is simple, and heating equipment does not need to be additionally arranged, the thermal deformation of the single-sided rack can be effectively eliminated, and the cutting precision is high. The flame cutting method is especially suitable for cutting and processing the single-sided racks of offshore platforms legs, and the cutting speed is quick and the cutting efficiency is high.
Description
Technical field
The present invention relates to a kind of flame cutting method of tooth bar, particularly a kind of flame cutting method that is used for the overlength single-side rack of self-elevating ocean platform spud leg belongs to the Machining Technology field.
Background technology
Self-elevating ocean platform is made up of some spud legs of platform and support platform.During the ocean platform operation, spud leg descends and is supported on the seabed, and platform rises to along spud leg and leaves water surface certain height, to reduce the impact of wave.When platform shifted, platform descended and bubbles through the water column, and spud leg rises from the seabed and keeps most of emersion water surface, the water resistance when reducing to be shifted.The normal up-down of spud leg is the basis of guaranteeing the ocean platform normal operation, thereby the jacking system that the driving spud leg goes up and down is the very important structure of ocean platform.
The jacking system of existing self-elevating ocean platform is divided into pinion and-rack and hydraulic jack jacking type, and wherein, pinion and-rack is fast, simple to operate with its rising or falling speed, easy preferentially to be adopted by most systems advantages such as well locations.The core component of pinion and-rack jacking system is a tooth bar.Tooth bar axially is welded on the spud leg wall along spud leg, is used for the driving force of hydraulic system is driven to spud leg, and big, the stressed complicacy of its bearing load, thereby require very high to the machining accuracy and the surface quality of tooth bar.And the tooth bar that is used for the ocean platform jacking system belongs to overlength, super-modulus tooth bar, and tooth bar length generally surpasses 5 meters, much larger than 1.5 meters of the conventional lower limits of overlength tooth bar; Difficulty of processing is very big; And tooth bar is selected the high-strength hardened and tempered steel material for use, and carbon equivalent is very high, and cutting performance is poor; Thereby; The tooth bar that is used for the ocean platform spud leg in the prior art is wayward in the thermal deformation of cutting processing process, causes that the tooth bar machining accuracy is low, gear tooth deformation is big, flank of tooth fineness is low, is difficult to satisfy in the ocean platform jacking system quality requirement to tooth bar.
The application for a patent for invention name is called " a kind of cutting method of spud leg main shipboard tube tooth bar "; Application publication number: CN 101987390A; Shen Qing Publication day: 2011.03.23; Disclose a kind of cutting method of spud leg main shipboard tube tooth bar, comprised the steps: step a, to be processed is placed on the cutting moulding bed; Step b, with to be processed the cutting tooth bar the position be heated to 100～300 ℃; Step c, carry out tooth bar cutting to machined part, among the step C, preferably, the tooth bar cutting is carried out on said to be processed both sides simultaneously along said to be processed length direction through flame cutting machine.This invention application has improved the cutting performance of member through the preheating to member to be cut; Improved cut quality, cutting error is controlled within 1 millimeter, cutting thickness reaches more than 170 millimeters; And the cutting surface smoothness reaches 4 grades of ▽; And, eliminated the distortion of cutting process to a certain extent through time cutting to two heel teeth corridors, improved machining accuracy.
But still there is open defect in this application for a patent for invention: the one, and be local preheating to the preheating of cutting member, local preheating need set up heater separately, has increased infrastructure cost; And heater needs on member, to move heating; Complicated operation inconvenience the more important thing is that local preheating forms steel plate subregion temperature jump; Cause the material physicochemical property to change, thereby reduce the tooth bar machining accuracy; The 2nd, the method that two heel teeth corridors are cut simultaneously only is suitable for two-sided tooth bar, for being curve, being that the single-side rack of straight line then can not be suitable for, makes the cutting of single-side rack be out of shape still wayward on one side; The 3rd, be employed in and insert pin in the joint-cutting to prevent the method for tooth bar skew; Because linear joint-cutting is fixator pins effectively; Thereby pin stationary cutter effectively, make cutting member in cutting, still be easy to generate skew, influence the cutting accuracy of tooth bar.
Summary of the invention
The local preheating that the present invention is intended to overcome the flame cutting method existence that has tooth bar now need increase firing equipment, complicated operation inconvenience; And the material physicochemical property that produces change causes cutting accuracy to reduce; And the method for both sides while cutting teeth corridor can not be suitable for the cutting of single-side rack; And cutting member fixing unreliable, be easy to generate skew and influence the shortcomings and deficiencies of cutting accuracy; A kind of flame cutting method of overlength single-side rack is provided, utilizes existing annealing furnace that cutting member is carried out whole preheating, and from both sides simultaneously the cutting teeth corridor, be divided into the method for two single-side racks from middle straight line again; Make the preheating speed of cutting member fast, easy to operate and need not extra increase firing equipment; And thermal deformation, the cutting accuracy that can effectively eliminate single-side rack are high, be specially adapted to the cutting processing of the single-side rack of ocean platform spud leg, and cutting speed are fast, cutting efficiency is high.
The present invention for realizing the technical scheme that technical purpose adopts is:
A kind of flame cutting method of overlength single-side rack is characterized in that may further comprise the steps:
A. steel plate integral body to be cut is preheated to 200～300 ℃;
B. the steel plate after the preheating is fixed on the Cutting platform;
C. measure steel billet temperature; When steel billet temperature is between 100～150 ℃, begin cutting; Two cutting tracks 1 cut two rooted tooth limits simultaneously in the steel plate upper edge to use two cutting torches during cutting; The width that the spacing on said two rooted tooth limits equals single rack adds the cutting gap compensation width, and cutting obtains a two-sided tooth bar after accomplishing;
D. the two-sided tooth bar that step C is obtained cuts into two parts along cutting track 2, obtains two single-side racks, accomplishes the tooth bar cutting.
A kind of flame cutting method of overlength single-side rack also comprises step e after the said step D: after two single-side racks treating step D gained were cooled to room temperature, lifting was taken out again.
A kind of flame cutting method of overlength single-side rack also comprises step B1 among the said step B: with the surface of steel plate covering insulation material after the preheating.
A kind of flame cutting method of overlength single-side rack, said insulation material are alumina silicate fibre.
A kind of flame cutting method of overlength single-side rack, the long edge of said Cutting platform exceed the length at long edge of steel plate less than 0.5m, and the short of said Cutting platform exceeds the length of short of steel plate less than 0.5m.
A kind of flame cutting method of overlength single-side rack, among the said step B, steel plate after the preheating and Cutting platform are fixing through being interrupted welding, and the spacing of adjacent two solder joints is less than 2m.
A kind of flame cutting method of overlength single-side rack, the cutting torch among said step C and the step D is an injector cutting torch, cutting gas is an oxygen-propane.
A kind of flame cutting method of overlength single-side rack during cutting steel plate, keeps cutting oxygen force value to surpass steel plate thickness 1/6 with cutting flame and is as the criterion, and perhaps keeping cutting oxygen pressure is 0.75～0.9MPA.
A kind of flame cutting method of overlength single-side rack, the speed of cutting steel plate are 130～170mm/min.
A kind of flame cutting method of overlength single-side rack, among the said step C, the cutting gap compensation width is 5～7mm.
Compared with prior art, characteristics of the present invention are:
1. whole preheating existing annealing furnace equipment capable of using and need not newly-increased firing equipment before the weldering can be practiced thrift cost effectively, and whole preheating need not to move firing equipment, operates more simple and convenient.The more important thing is that whole preheating can make whole steel plate thermally equivalent, the cutting performance overall variation is avoided the steel plate subregion temperature jump that brings because of local heat, and causes the material physicochemical property to change, and the defective that reduces of consequent machining accuracy.
2. the present invention adopts and at first to cut a two-sided tooth bar, becomes the method for two single-side racks from middle straight cuts again; Because the line style and the length on two tooth limits of two-sided tooth bar are in full accord; Be heated during cutting evenly, the distortion that the inequality of having avoided being heated causes, thus significantly improved the cutting accuracy of single-side rack; Make the tooth bar of machine-shaping can satisfy the requirement of ocean platform fully; And tooth corridor, two sides can cut simultaneously, has both guaranteed that the two-sided distortion of tooth bar is consistent, and has also significantly promoted cutting processing efficient.
3. the edge of the Cutting platform length that exceeds the edges of plate is not more than 0.5 meter; Can effectively limit the displacement of steel plate under dissection; Steel plate and Cutting platform adopt the fixing mode of welding; It is fixing reliable, can guarantee that any micro displacement does not take place in cutting process steel plate, guarantees that cutting track is accurate, cutting accuracy is high.After cutting is accomplished, will cut clout cutting and separating from the Cutting platform and get final product, Cutting platform can reuse.
4. preheating steel plate and covering insulation material alumina silicate fibre are incubated steel plate before the cutting; Cutting before measurement dimension plate temperature when steel billet temperature begins cutting in time between 100～150 ℃ of the optimum Cutting temperature, can make steel plate be in the optimum Cutting state; Further guarantee cut quality, improve cutting efficiency.
5. confirm relevant cutting parameter according to the cutting characteristics of overlength single-side rack; Comprise: the cutting cutting torch is selected injector cutting torch for use; Cutting gas is selected the oxygen-propane that flame temperature is lower, the cutting distortion is little for use; Regulate oxygen pressure to cutting flame and surpass 1/6 of steel plate thickness, perhaps regulating oxygen pressure is 0.75～0.9MPA, and cutting speed is selected lower speed 130～170mm/min; Further improve cut quality, guarantee that the tooth bar of machine-shaping can satisfy the high accuracy of ocean platform spud leg, high-quality requirement.
Description of drawings
Fig. 1 is a steel plate cutting track sketch map.
The specific embodiment
The flame cutting method of overlength single-side rack provided by the invention comprises the step of following A～D:
A. steel plate integral body to be cut is preheated to 200～300 ℃;
B. the steel plate after the preheating is fixed on the Cutting platform;
C. measure steel billet temperature; When steel billet temperature is between 100～150 ℃, begin cutting; Two cutting tracks 1 cut two rooted tooth limits simultaneously in the steel plate upper edge to use two cutting torches during cutting; The width that the spacing on two rooted tooth limits equals single rack adds the cutting gap compensation width, and cutting obtains a two-sided tooth bar after accomplishing;
D. the two-sided tooth bar that step C is obtained cut into two parts along cutting track 2, obtain two single-side racks, accomplish the tooth bar cutting.
In the steps A, whole preheating can be adopted steel plate integral body is positioned over the method that heats in the annealing furnace.Compare with the local preheating of prior art, whole warm-up operation is simple and convenient, and existing equipment capable of using and need not to increase firing equipment, practices thrift cost effectively.The more important thing is that whole preheating can make whole steel plate thermally equivalent, the cutting performance overall variation is avoided the steel plate subregion temperature jump that brings because of local heat, and causes the material physicochemical property to change, and the defective that reduces of consequent machining accuracy.
The temperature of whole preheating can be selected 200～300 ℃ for use; Select above-mentioned preheat temperature preheating steel plate for use; Make steel plate in follow-up fixation procedure (about about 2 hours), just in time naturally cool in 100～150 ℃ of the steel plate optimum Cutting temperature, be convenient to follow-up cutting processing.When preheat temperature is higher than 300 ℃, can make steel plate produce bigger, uppity heat expansion distortion, influence cutting accuracy; Be lower than 200 ℃ and work as preheat temperature, steel plate temperature in fixation procedure be reduced to be lower than the optimum Cutting temperature, the cutting performance of steel plate is descended greatly.If steel plate waits for that clipping time is longer, all right covering insulation material is to keep temperature.The preferred alumina silicate fibre of insulation material, that alumina silicate fibre has is high temperature resistant, thermal conductivity factor is low, unit weight is light, good springiness, characteristics such as nontoxic, is specially adapted to the insulation of sheet metal.
Among the step B, the long edge of Cutting platform exceeds the length at long edge of steel plate less than 0.5m, and the short of Cutting platform exceeds the length of short of steel plate less than 0.5m.The size of Cutting platform confirms that according to plate size to be cut for making things convenient for fixation steel plate, the size of Cutting platform is usually greater than steel plate.But excessive Cutting platform is unfavorable for the fixing of steel plate, because the steel plate trend that move on oriented both sides under dissection is excessive like the space on both sides, can bigger displacement take place steel plate, influences cutting accuracy.Therefore, the size of the present invention's Cutting platform is set to length that every edge exceeds the steel plate corresponding edge less than 0.5m, can effectively limit the displacement of steel plate, improves cutting accuracy.
Among the step B, steel plate fixing on Cutting platform preferably selected for use to be interrupted to weld and fixed, and the spacing of adjacent two solder joints is less than 2 meters.The fixed form that welding is fixed is reliable, can guarantee that any micro displacement does not take place in cutting process steel plate, guarantees cutting accuracy.After steel plate cutting is accomplished, can steel plate clout cutting and separating from the Cutting platform be got final product, Cutting platform can be reused.
Among the step C, measure steel billet temperature, can select for use infrared radiation thermometer to measure.When keeping steel plate to be in 100～150 ℃ of optimum Cutting temperature, steel plate is in the optimum Cutting state, can effectively improve cut quality and cutting efficiency.When temperature surpassed 150 ℃, the rising that steel plate can Yin Wendu and form bigger heat expansion distortion, and the tooth bar of machine-shaping is in cooling procedure, the excessive shrinkage distortion of profile of tooth can change the profile, size of profile of tooth etc. largely, influenced the precision of tooth bar.When temperature was lower than 100 ℃, the cutting performance of steel plate can not well be improved, and influenced cut quality and cutting efficiency.
The cutting processing of step C and step D, as shown in Figure 1, the first step is cut two tooth limits along two cutting tracks 1 earlier simultaneously, obtains a two-sided tooth bar, again along cutting track 2 straight cuts, obtains two single-side racks.
During prior art cutting single-side rack; Since cutting curve limit and straight line linear, line length is different; The tooth bar both sides are heated inequality and cause steel plate to produce distortion, and the tooth bar that uses of ocean platform is the overlength tooth bar in addition, and length reaches more than 5 meters; The cutting distortion is progressively accumulated and the bigger distortion of final formation, has greatly reduced the tooth bar cutting accuracy.And the present invention adopt cut two tooth limits simultaneously, cutting is divided into the method for two single-side racks from the centre again; When cutting two tooth limits simultaneously,, be heated during cutting evenly because the line style and the length on two tooth limits are in full accord; Eliminated the uneven distortion of being heated; Thereby significantly improved the cutting accuracy of single-side rack, made the tooth bar of machine-shaping can satisfy the requirement of ocean platform fully, and significantly promoted cutting processing efficient.
Among the step C, the cutting gap compensation width is relevant with the thickness of cutting steel plate, the size of cutting torch etc., can be set to 5～7mm.
Among step C and the step D, the cutting cutting torch can be selected injector cutting torch for use, and cutting gas can be selected for use and be oxygen-propane.Because the oxy-propane cutting flame temperature is lower, the cutting distortion is little, thereby can further control the tooth bar distortion, improves cutting accuracy, and oxygen-propane cutting gas low in calories can guarantee that steel plate cutting upper surface can not melt and collapse and influence cut quality.
Among step C and the step D, cutting oxygen pressure confirms that according to the thickness of cutting steel plate thickness is big more, and oxygen pressure is big more.Preferably, regulate oxygen pressure to cutting flame and surpass 1/6 of steel plate thickness, perhaps regulating oxygen pressure is 0.75～0.9MPA.
Among step C and the step D, cutting speed can be 130～170mm/min.Cutting speed directly has influence on the stability and the cutting section quality of cutting process; And too fast cutting speed can make cutting section mass defects such as depression and extension slag occur; Therefore the present invention takes all factors into consideration the factors such as performance parameter, steel plate material and thickness of cutting combustion gas, cutting torch, confirms that cutting speed is 130～170mm/min.
The flame cutting method of overlength single-side rack provided by the invention also comprises step e: after tooth bar cutting finishes, treat that tooth bar is cooled to room temperature after, rack part is taken out in lifting again.Rigidity was lower when tooth bar was in high temperature, was easy to generate moderate finite deformation in the hoisting process, influenced the tooth bar precision, and therefore preferred the wait after tooth bar is cooled to room temperature lifts taking-up again.
Claims (10)
1. the flame cutting method of an overlength single-side rack is characterized in that may further comprise the steps:
A. steel plate integral body to be cut is preheated to 200～300 ℃;
B. the steel plate after the preheating is fixed on the Cutting platform;
C. measure steel billet temperature; When steel billet temperature is between 100～150 ℃, begin cutting; Two cutting tracks 1 cut two rooted tooth limits simultaneously in the steel plate upper edge to use two cutting torches during cutting; The width that the spacing on said two rooted tooth limits equals single rack adds the cutting gap compensation width, and cutting obtains a two-sided tooth bar after accomplishing;
D. the two-sided tooth bar that step C is obtained cuts into two parts along cutting track 2, obtains two single-side racks, accomplishes the tooth bar cutting.
2. the flame cutting method of a kind of overlength single-side rack according to claim 1 is characterized in that said step D also comprises step e afterwards:
E. after two single-side racks treating step D gained were cooled to room temperature, lifting was taken out again.
3. the flame cutting method of a kind of overlength single-side rack according to claim 1 is characterized in that also comprising among the said step B step B1:
B1. the surface of steel plate covering insulation material after preheating.
4. the flame cutting method of a kind of overlength single-side rack according to claim 3 is characterized in that: said insulation material is an alumina silicate fibre.
5. the flame cutting method of a kind of overlength single-side rack according to claim 1; It is characterized in that: the long edge of said Cutting platform exceeds the length at long edge of steel plate less than 0.5m, and the short of said Cutting platform exceeds the length of short of steel plate less than 0.5m.
6. the flame cutting method of a kind of overlength single-side rack according to claim 1 is characterized in that: among the said step B, steel plate after the preheating and Cutting platform are fixing through being interrupted welding, and the spacing of adjacent two solder joints is less than 2m.
7. the flame cutting method of a kind of overlength single-side rack according to claim 1 is characterized in that: the cutting torch among said step C and the step D is an injector cutting torch, and cutting gas is an oxygen-propane.
8. according to the flame cutting method of claim 1 or 7 described a kind of overlength single-side racks, it is characterized in that: during cutting steel plate, keep cutting oxygen force value to surpass steel plate thickness 1/6 with cutting flame and be as the criterion, perhaps keeping cutting oxygen pressure is 0.75～0.9MPA.
9. the flame cutting method of a kind of overlength single-side rack according to claim 1 is characterized in that: the speed of cutting steel plate is 130～170mm/min.
10. the flame cutting method of a kind of overlength single-side rack according to claim 1 is characterized in that: among the said step C, the cutting gap compensation width is 5～7mm.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102764925A (en) * | 2012-07-04 | 2012-11-07 | 上海振华重工集团(南通)传动机械有限公司 | Rack cutting technology used for ocean platform |
| CN105127547A (en) * | 2015-09-23 | 2015-12-09 | 天津惠蓬海洋工程有限公司 | Self-elevating drilling platform single-side rack plate cutting technology |
| CN105149725A (en) * | 2015-09-23 | 2015-12-16 | 天津惠蓬海洋工程有限公司 | Common cutting technology for spud leg main cord rack plates of self-elevating drilling platform |
| CN106064258A (en) * | 2016-07-05 | 2016-11-02 | 武汉船用机械有限责任公司 | A kind of tooth bar cutting method and gear rack elevating device |
| CN109465517A (en) * | 2018-12-17 | 2019-03-15 | 云南昆钢重型装备制造集团有限公司 | A kind of thermal expansion amount control method of NC Flame Cutting part of the steel plate size |
| CN111408914A (en) * | 2020-04-08 | 2020-07-14 | 上海振华重工集团(南通)传动机械有限公司 | Manufacturing method of lifting gear applied to pile leg of self-elevating ocean platform |
| CN113523492A (en) * | 2021-08-05 | 2021-10-22 | 宝武集团鄂城钢铁有限公司 | Online segmented cutting device and method for heat-treated steel plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102764925A (en) * | 2012-07-04 | 2012-11-07 | 上海振华重工集团(南通)传动机械有限公司 | Rack cutting technology used for ocean platform |
| CN105127547A (en) * | 2015-09-23 | 2015-12-09 | 天津惠蓬海洋工程有限公司 | Self-elevating drilling platform single-side rack plate cutting technology |
| CN105149725A (en) * | 2015-09-23 | 2015-12-16 | 天津惠蓬海洋工程有限公司 | Common cutting technology for spud leg main cord rack plates of self-elevating drilling platform |
| CN106064258A (en) * | 2016-07-05 | 2016-11-02 | 武汉船用机械有限责任公司 | A kind of tooth bar cutting method and gear rack elevating device |
| CN106064258B (en) * | 2016-07-05 | 2018-04-17 | 武汉船用机械有限责任公司 | A kind of rack cutting method and gear rack elevating device |
| CN109465517A (en) * | 2018-12-17 | 2019-03-15 | 云南昆钢重型装备制造集团有限公司 | A kind of thermal expansion amount control method of NC Flame Cutting part of the steel plate size |
| CN111408914A (en) * | 2020-04-08 | 2020-07-14 | 上海振华重工集团(南通)传动机械有限公司 | Manufacturing method of lifting gear applied to pile leg of self-elevating ocean platform |
| CN113523492A (en) * | 2021-08-05 | 2021-10-22 | 宝武集团鄂城钢铁有限公司 | Online segmented cutting device and method for heat-treated steel plate |
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| CN102489823B (en) | 2014-05-21 |
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