CN110480255B - Method for reducing double-side shearing burrs of thick plate - Google Patents
Method for reducing double-side shearing burrs of thick plate Download PDFInfo
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- CN110480255B CN110480255B CN201810459190.1A CN201810459190A CN110480255B CN 110480255 B CN110480255 B CN 110480255B CN 201810459190 A CN201810459190 A CN 201810459190A CN 110480255 B CN110480255 B CN 110480255B
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Abstract
The invention discloses a method for reducing double-side shearing burrs of a thick plate, which comprises the following steps: setting the horizontal distance Gap between the plumb surfaces of the cutting edges of the upper and lower shearing blades of the bilateral shears as (10-11%). t.alpha. + lambda; the measurement and the judgment of the installation levelness of the upper and the lower cutting edges of the double-sided shears are as follows: after the cutting edges are replaced and installed, cutting edge gap values of three corresponding points corresponding to the scale of the pointer of the main driving angle dial of the double-sided shears need to be measured respectively, any two gap values are taken as arithmetic differences epsilon, the arithmetic differences epsilon are more than 0.3-0.4 mm, and the levelness of the upper cutting edge and the lower cutting edge is considered not to meet the requirements and needs to be adjusted and processed; chamfering the corners of the inlet sides of the lower shear blades on the two sides of the double-sided shear; and (4) chamfering and grinding the lateral surfaces of the biting angle positions of the shearing edges on the two sides of the double-sided shear. The invention adopts a comprehensive improvement mode with multiple pipes, effectively inhibits the generation of burrs and has obvious effect.
Description
Technical Field
The invention relates to the field of thick plate shearing in the metallurgical industry, in particular to a method for reducing double-side shearing burrs of a thick plate.
Background
The finished slab of the thick plate has strict requirements and standards on the surface quality, and common surface quality defects easily generated by the shear line of the thick plate, such as: indentation, burr pressing and the like generally need manual grinding treatment by a grinding machine, if the thickness of the position after grinding is lower than the ordered thickness lower limit of the finished plate, the finished plate can not meet delivery conditions, and only can be rolled again after the product is removed, so that the loss is large. In addition, the steel plates with higher surface quality requirements are not allowed to be ground, and if the defects are generated, the steel plates are directly removed.
The double-sided shears are one of the most important shears for a thick plate shearing line, and are used for shearing two sides of a steel plate according to the order size of a customer. As shown in fig. 1, in the actual production of thick plates, it is found that fine burrs 3 are easily generated in the double-sided shears during the shearing of the steel plate 6 (the traveling direction of the steel plate 6 is shown by an arrow), and when the double-sided shears upper shearing blade 2 rolls and shears the steel plate 6, the fine burrs 3 are easily carried and fall to both side portions of the upper surface of the steel plate 6. The burr 3 is rolled by the back 2# upper pinch roll 4 in the process of conveying the steel plate 6 in the direction shown by the arrow, and then the burr 3 is pressed into the surface of the steel plate 6 to form a thin strip-shaped indentation with obvious appearance. Similarly, fine burrs or fine metal chips are also easily brought down to the double-sided shear table or the lower shear edge 5, and further cause full-length periodic burr pressing on the lower surface of the steel plate to be subsequently sheared, and if the burrs are found later, serious consequences of batch quality defects are easily caused. As described above, the indentation caused by the press-fitting of the small burr 3 needs to be repaired by additional grinding in the subsequent process, which has a great influence on the logistics, production organization, and the like in the field. Further, if the indentation depth exceeds the thickness tolerance allowable range, the contract can only be removed, so that great loss is caused, and the timeliness of contract completion is directly influenced.
In conclusion, burrs are easily generated in the process of shearing a steel plate by the double-sided shear, which is the root cause of the pressing quality defect of the burrs and needs to be solved urgently.
In the prior art, as disclosed in patent application No. 201020531036.X, "a steel plate shearing burr pressing-in prevention device", a burr brush made of a phi 40mm high-temperature-resistant rubber pipe is arranged at the bottom of a front panel of a double-sided shear; the pipe diameter of the wind sweeping pipe is enlarged from phi 10mm to phi 50mm, the air outlet hole of the wind sweeping pipe is changed into an air nozzle, and the incoming air quantity is greatly increased. The device is under the combined action that brush and tuyere sweep are scraped to the rubber tube burr, with burr clearance steel plate surface, can reduce the steel sheet burr to a certain extent and impress. However, the device has the following disadvantages: the device belongs to the nature of remedy after the affairs, scrapes the brush and sweeps through burr brush and nozzle sweep device to the burr that has produced promptly, does not restrain the production of cuting the burr from essential source, and the device makes the burr easily gather in burr brush position in addition, causes the possibility of follow-up being impressed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for reducing the generation of double-side shearing burrs of a thick plate, which effectively inhibits the generation of burrs and has obvious effect by adopting a multi-pipe and comprehensive improved mode.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for reducing double-sided burr generation for a plank, comprising:
1) setting the horizontal distance Gap between the plumb surfaces of the cutting edges of the upper and lower shearing blades of the double-sided shear:
Gap＝(10％～11％)*t*α+λ，
in the formula, t is the rolling thickness of the steel plate to be sheared, alpha is the TS correction coefficient of the steel plate to be sheared, lambda is the abrasion compensation correction value of the shearing edge,
TS is tensile strength, and the unit is Mpa;
2) the measurement and the judgment of the installation levelness of the upper and the lower cutting edges of the double-sided shears are as follows:
after the cutting edges are replaced and installed, cutting edge gap values of three corresponding points corresponding to the scale of the pointer of the main driving angle dial of the double-sided shears need to be measured respectively, any two gap values are taken as arithmetic differences epsilon, the arithmetic differences epsilon are more than 0.3-0.4 mm, and the levelness of the upper cutting edge and the lower cutting edge is considered not to meet the requirements and needs to be adjusted and processed;
3) chamfering the corners of the inlet sides of the lower shear blades on the two sides of the double-sided shear;
4) and (4) chamfering and grinding the lateral surfaces of the biting angle positions of the shearing edges on the two sides of the double-sided shear.
The alpha is taken according to the following standard:
0Mpa≦TS≦600Mpa，α＝0.9～1.0；
600Mpa<TS≦800Mpa，α＝0.8～0.9；
800Mpa<TS≦1200Mpa，α＝0.6～0.7。
the lambda is taken according to the following standard: the compensation of the double-sided shear is-0.1 to-0.2 mm when each double-sided shear shears one thousand knives.
The three corresponding points are respectively the positions of 120 degrees, 150 degrees and 180 degrees on the pointer scale of the angle dial.
The chamfer angle of the corner on the inlet side of the lower shear blade is 30-40 degrees, and the chamfer angle depth d is 5-8 mm.
The chamfer grinding length l of the side face of the biting angle position of the upper shear blade is 200-250 mm, the height h is 40-50 mm, and the depth s is 0.2-0.4 mm.
In the technical scheme, the method for reducing the generation of the double-sided shearing burrs of the thick plate, provided by the invention, has the advantages that the most reasonable gap between the shearing edges of the double-sided shears is set, the measuring method and the judgment standard for the installation levelness of the upper and lower shearing edges of the double-sided shears are set, the corner at the inlet sides of the lower shearing edges (including the shearing edge box) at the two sides of the double-sided shears is chamfered, and the side chamfer grinding at the biting angle positions of the upper shearing edges at the two sides of the double-sided shears is carried out, so that the burrs generated by the double-sided shears in the steel plate shearing process can be effectively inhibited and reduced by multiple pipes, and the quality defect of burr pressing in. The steel plate has the advantages of having very positive and effective effects on improving the quality of the steel plate, simplifying field logistics, reducing the process cost and the like, and having stable effect and continuous reliability.
Drawings
FIG. 1 is a schematic view of a thick plate double sided shear shearing steel plate;
FIG. 2 is a schematic view of the horizontal gap between the upper and lower cutting edges of the double-sided shears of the present invention;
FIG. 3 is a schematic view of the measurement points of the double-sided shears;
FIG. 4 is a schematic view of a steel plate head impacting a lower shear edge of a double-sided shear;
FIG. 5 is a sectional view taken along line A-A of FIG. 4;
FIG. 6 is an enlarged schematic view of position B of FIG. 5;
FIG. 7 is a schematic view of a lower shear edge chamfer of the double-sided shears of the present invention;
FIG. 8 is an enlarged schematic view of position C of FIG. 7;
FIG. 9 is a schematic diagram of the chamfer grinding at the cutting edge biting angle of the double-sided shears of the present invention;
fig. 10 is an enlarged schematic view of the position D in fig. 9.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the embodiment.
The invention provides a method for reducing double-sided shearing burrs of a thick plate, which comprises the following steps:
1) setting the most reasonable blade gap of the double-sided shear
The most reasonable gap between the cutting edges of the double-sided shears is set, so that the quality of the cut surface of the sheared steel plate is ensured, the abnormal abrasion of the cutting edges is prevented, the service life of the cutting edges is prolonged, and the like. Furthermore, if the gap between the shearing blades is unreasonable, the passivation of the shearing blades is easy to accelerate, and the side faces of the upper and lower shearing blades can generate metal adhesion and adhesion with rough hand feeling, so that the double-sided shear can generate fine burrs and metal particle fragments in the shearing process. These fine burrs and particle chips are easily pressed into the upper and lower surfaces of the steel sheet to cause quality defects. The most reasonable cutting edge clearance must therefore be set:
as shown in fig. 2, the Gap between the two-sided shear blades is the horizontal distance Gap between the vertical planes of the upper shear blade 2 and the lower shear blade 5:
Gap＝(10％～11％)*t*α+λ，
in the above formula, t is the rolling thickness of the steel plate to be sheared, α is the correction coefficient of the tensile strength (TS for short, unit is Mpa) of the steel plate to be sheared, and λ is the wear compensation correction value of the shearing edge.
Preferably, the tensile strength correction coefficient α of the current steel plate to be sheared is obtained according to the following standard:
0Mpa≦TS≦600Mpa，α＝0.9～1.0；
600Mpa<TS≦800Mpa，α＝0.8～0.9；
800Mpa<TS≦1200Mpa，α＝0.6～0.7。
here, it is explained that: the maximum strength of the steel plate sheared by the double-sided shear is shown in the standard of shearing capacity of equipment, and the difference exists between different equipment.
Preferably, the cutting edge wear compensation correction value λ is obtained according to the following standard: the compensation of the double-sided shear is-0.1 to-0.2 mm when each double-sided shear shears one thousand knives.
2) Method for measuring installation levelness of upper cutting edge 2 and lower cutting edge 5 of double-sided shear and judgment standard
After the double-sided shear blades are replaced and installed, the vertical planes of the upper shear blade 2 and the lower shear blade 5 are parallel to each other as far as possible, which is an important means for ensuring the quality of the cut surface of the edge of the sheared steel plate and inhibiting the generation of small burrs in the shearing process.
As shown in fig. 3, after the cutting edge is replaced and installed, the cutting edge clearance at the three-point position of A, B, C in the figure must be measured and calibrated, if the arithmetic difference of the measured clearance exceeds the standard, the measured clearance is regarded as abnormal, and relevant adjustment processing is required.
Preferably, the method for measuring the cutting edge gap comprises the following steps:
(1) adjusting the set value of the blade clearance to 2.0mm, and respectively measuring the clearances of three points of a point A (corresponding to the scale of a dial pointer of the main drive angle of the double-sided shear to be about 120 degrees), a point B (corresponding to the scale to be about 150 degrees) and a point C (corresponding to the scale to be about 180 degrees) of the graph;
(2) and (3) making an arithmetic difference between any two measured gap values, and if the arithmetic difference epsilon is greater than 0.3-0.4 mm, determining that the mounting levelness of the upper and lower shear blades does not meet the requirement, and adjusting, for example, adding a copper gasket at the positions of the upper shear blade box and the shearing machine tool rest locking head to adjust the levelness.
3) Chamfering the inlet side corner of the lower shear blade (including the blade box) at both sides of the double-sided shear
As shown in fig. 3 to 5, the steel plate 6 has relative friction between the two sides of the lower surface thereof and the double-sided scissor table lining plate 7 during the shearing transportation (the transportation traveling direction is shown by an arrow in the figure), especially the friction is more serious for some steel plates with poor plate shapes such as head buckling. Therefore, the table liner 7 is inevitably worn for a long time and the thickness thereof is reduced, and when the wear is reached to a certain extent, the upper surface of the lower cutting edge 5 (including the cutting edge box for fixing the lower cutting edge 5) is higher than the table liner 7. When the steel plate 6 to be sheared by the bilateral shear, which is transversely cut by the head of the head-shearing shear in the previous process, enters the shearing machine, the lower edge corner of the head-shearing section of the steel plate can be scraped or even hit the corner fast opening on the inlet side of the lower shearing blade 5. Due to the fact that the material hardness of the shearing edge is very high, metal particle scraps or small burrs are easily generated by scraping and are brought to the shearing edge or the cutter platform by the forward conveyed steel plate, and the pressing defect of the lower surface of the subsequent steel plate is caused. Since the defect is difficult to inspect and find in the steel sheet below, it is liable to cause a serious problem of mass quality. For this purpose, the following technical improvements are necessary:
as shown in fig. 7 to 8, before the new cutting edge is replaced on the machine, the corner on the inlet side of the lower cutting edge 5 (including the cutting edge box) must be chamfered to ensure that the steel plate can pass smoothly when the cutting edge surface of the lower cutting edge is slightly higher than the cutting edge surface, the chamfer size θ is 30 to 40 degrees, and the chamfer depth d is 5 to 8 mm.
4) Chamfering and grinding the lateral surfaces of the biting angle positions of the shearing blades on the two sides of the double-sided shear
The upper cutting edge 2 of the double-sided shears has the top acute angle at the right lower side of the biting angular position (shown in figure 10) and the vertical corner of the end face of the cutting edge do arc shearing movement relative to the edge of the steel plate in the process of rolling and shearing the steel plate, and fine burrs are easily generated when the corner is squeezed and scraped on the edge of the steel plate. To avoid burr generation:
as shown in fig. 9 to 10, the new cutting edge of the double-sided shears needs to be subjected to chamfering and grinding treatment on the side surface of the biting angle of the cutting edge 2 on the two sides before the mounting of the upper machine. The chamfer grinding length l is 200-250 mm, the height h is 40-50 mm, the chamfer grinding depth s is 0.2-0.4 mm, the grinding area is a triangular area as shown in the figure, and the triangular grinding surface and the side surface of the upper shear blade are in smooth transition.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (6)
1. A method for reducing double-sided burr generation for a plank, comprising:
1) setting the horizontal distance Gap between the plumb surfaces of the cutting edges of the upper and lower shearing blades of the double-sided shear:
Gap＝(10％～11％)*t*α+λ，
in the formula, t is the rolling thickness of the steel plate to be sheared, alpha is the TS correction coefficient of the steel plate to be sheared, lambda is the abrasion compensation correction value of the shearing edge,
TS is tensile strength, and the unit is Mpa;
2) the measurement and the judgment of the installation levelness of the upper and the lower cutting edges of the double-sided shears are as follows:
after the cutting edges are replaced and installed, cutting edge gap values of three corresponding points corresponding to the scales of the indicator of the main driving angle dial of the double-sided shears need to be measured respectively, any two gap values are taken as arithmetic differences epsilon, the arithmetic differences epsilon are greater than 0.3mm, and the levelness of the upper cutting edge and the lower cutting edge does not meet the requirements and needs to be adjusted and processed;
3) chamfering the corners of the inlet sides of the lower shear blades on the two sides of the double-sided shear;
4) and (4) chamfering and grinding the lateral surfaces of the biting angle positions of the shearing edges on the two sides of the double-sided shear.
2. The method of claim 1 for reducing the production of double-sided clippings in a plank comprising: the alpha is taken according to the following standard:
0Mpa≦TS≦600Mpa，α＝0.9～1.0；
600Mpa<TS≦800Mpa，α＝0.8～0.9；
800Mpa<TS≦1200Mpa，α＝0.6～0.7。
3. the method of claim 1 for reducing the production of double-sided clippings in a plank comprising: the lambda is taken according to the following standard: the compensation of the double-sided shear is-0.1 to-0.2 mm when each double-sided shear shears one thousand knives.
4. The method of claim 1 for reducing the production of double-sided clippings in a plank comprising: the three corresponding points are respectively the positions of 120 degrees, 150 degrees and 180 degrees on the pointer scale of the angle dial.
5. The method of claim 1 for reducing the production of double-sided clippings in a plank comprising: the chamfer angle of the corner on the inlet side of the lower shear blade is 30-40 degrees, and the chamfer angle depth d is 5-8 mm.
6. The method of claim 1 for reducing the production of double-sided clippings in a plank comprising: the chamfer grinding length l of the side face of the biting angle position of the upper shear blade is 200-250 mm, the height h is 40-50 mm, and the depth s is 0.2-0.4 mm.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05104146A (en) * | 1991-10-17 | 1993-04-27 | Sumitomo Metal Ind Ltd | Method for correcting defective sheared surface |
| CN101920356A (en) * | 2010-07-29 | 2010-12-22 | 重庆钢铁(集团)有限责任公司 | Double-sided shear for thick steel plate production and method thereof for automatic plate-shearing for roller way conveying |
| CN202539672U (en) * | 2012-03-08 | 2012-11-21 | 新疆八一钢铁股份有限公司 | Device for eliminating burrs shorn by double-side shears |
| CN103034199A (en) * | 2012-12-11 | 2013-04-10 | 济钢集团有限公司 | Control system and control method of bilateral scissors capable of fast shearing |
| CN103801566A (en) * | 2013-12-26 | 2014-05-21 | 宝钢发展有限公司 | Control method for reducing edge faults of hot rolled steel plate in line rolling process |
| CN106238506A (en) * | 2016-09-18 | 2016-12-21 | 舞阳钢铁有限责任公司 | A kind of method of quick measurement Double-side-shearing pinch roll |
-
2018
- 2018-05-15 CN CN201810459190.1A patent/CN110480255B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05104146A (en) * | 1991-10-17 | 1993-04-27 | Sumitomo Metal Ind Ltd | Method for correcting defective sheared surface |
| CN101920356A (en) * | 2010-07-29 | 2010-12-22 | 重庆钢铁(集团)有限责任公司 | Double-sided shear for thick steel plate production and method thereof for automatic plate-shearing for roller way conveying |
| CN202539672U (en) * | 2012-03-08 | 2012-11-21 | 新疆八一钢铁股份有限公司 | Device for eliminating burrs shorn by double-side shears |
| CN103034199A (en) * | 2012-12-11 | 2013-04-10 | 济钢集团有限公司 | Control system and control method of bilateral scissors capable of fast shearing |
| CN103801566A (en) * | 2013-12-26 | 2014-05-21 | 宝钢发展有限公司 | Control method for reducing edge faults of hot rolled steel plate in line rolling process |
| CN106238506A (en) * | 2016-09-18 | 2016-12-21 | 舞阳钢铁有限责任公司 | A kind of method of quick measurement Double-side-shearing pinch roll |
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