Search

CN-117380727-B - Flat steel continuous rolling pass process shared in extremely wide range

CN117380727BCN 117380727 BCN117380727 BCN 117380727BCN-117380727-B

Abstract

The invention relates to the technical field of metal pressure processing, and discloses a very wide-range shared flat steel continuous rolling pass process, which can produce most of flat steel specifications, the specification replacement of the flat steel can be realized only by adjusting a roll gap without changing a roll in the process of replacing the flat steel specifications, the occupation quantity of a roll mill is greatly reduced, the method has the advantages that the quick replacement of the specifications is realized, the production of the flat spring steel is particularly facilitated, the performance reduction and even the full decarburization phenomenon caused by the increase of the depth of the decarburized layer due to the extension of the furnace time of the flat spring steel due to the replacement of the specifications are reduced, the stability of the performance of the flat spring steel is facilitated, the quick replacement of the specifications is realized by the flat steel tandem rolling pass process which is extremely widely shared, the flat spring steel production structure is very suitable for small batches and flat steel production organizations with multiple specifications, the production specifications can be flexibly arranged, and the production requirements of small batch orders are met.

Inventors

  • LIU JIACHENG
  • LI JIAJUN
  • HU BO
  • TAO JIYANG

Assignees

  • 湖南华菱湘潭钢铁有限公司

Dates

Publication Date
20260508
Application Date
20231127

Claims (9)

  1. 1. The ultra-wide range shared flat steel tandem rolling pass process is characterized by comprising the following steps of: S1, initially rolling a round hole on flat steel, wherein the base circle radius R0 of the round hole is determined by Hmax and Wmax of the flat steel, the size of R0 is determined according to R0 (Wmax+0.8Hmax)/3, namely the initial round hole radius is determined by the maximum width and the maximum thickness of the flat steel, and the round hole radius is determined according to R0 (Wmax+0.8Hmax)/3; S2, when the minimum specification is produced, the shape of the hole type material is received to be the minimum value, and the height H0 of the hole type material is approximately equal to (Wmax+0.8Hmax)/3- (Hmax-Hmin)/5, and the width of the hole type material is equal to the height of the hole type material; s3, hole widening is carried out after the round holes are rolled, wherein K6+i, K6 and K5 are widening holes, K4 holes are width control holes, K3 holes are flat holes, K2 holes are forming holes and K1 shaping holes; s4, when rolling the circular arc flat steel, R4 is approximately equal to 0.5Hmax+4-6 mm, and when rolling the rectangular or right-angle flat steel, the K4 hole type is rolled by adopting a hole-free system; S5, the rolling piece is pressed down more when the small-width flat steel in the flat steel series products is rolled, the difference between the shape of the rolling piece and the required finished product is larger, and the rolling piece is leveled in the K3 hole after the K4 hole comes out, so that a leveling hole H3 is obtained; S6, when rolling the circular arc flat steel, rolling the rectangular or right-angle flat steel by adopting a flat roller, wherein after K2 grooved rolling, the shape of a rolled piece is close to a state meeting the requirement of a finished product; s7, shaping the rolled piece after the K2 rolling is finished through a K1 hole pattern; And in the step S3, the value of i is 0-3 according to the product requirement, and is mainly determined by the arrangement form of a production line, wherein i is more than the value.
  2. 2. The ultra-wide range shared flat steel tandem rolling pass process of claim 1, wherein the flat hole H3 in S5 is determined by a finished product H, H3 is approximately equal to H+0-3 mm, and the flat steel is the same as the finished product in width and higher in height than the finished product after K3 pass rolling.
  3. 3. The continuous rolling pass process for flat steel with extremely wide range as in claim 2, wherein the radius of the bottom arc of the K2 forming hole is R2 when rolling the arc flat steel in S6, wherein R2 = H/2+ 0-5 mm.
  4. 4. The ultra-wide range shared flat steel continuous rolling pass process according to claim 1, wherein R0 is an initial round hole base radius, H6+i is K6+i-th wide aperture height, H6 is K6-th wide aperture height, H5 is K5 wide aperture height, R4 is a K4 controlled wide aperture bottom arc radius when rolling an arc flat steel, W4 is a K4 controlled wide aperture width, H3 is a K3 flat aperture height, R2 is a K2 formed aperture bottom arc radius when rolling an arc flat steel, W2 is a K2 formed aperture width, H is a finished product thickness, W is a finished product width, and R is an arc flat steel arc surface radius.
  5. 5. A very wide range common flat steel tandem rolling pass process according to claim 4 wherein said arcuate flat steel has an arcuate surface radius R.apprxeq.H/2.
  6. 6. A tandem rolling pass process for extremely wide range common flat steel according to claim 1 wherein said initial rolling of round holes in flat steel to K4 pass uses flat rolls and each pass is assigned according to the rolling thickness.
  7. 7. A tandem rolling pass process for extremely wide range common flat steel according to claim 1 wherein flat rolls are used for the production of said rectangular or right angle flat steel.
  8. 8. An extremely wide range common flat steel tandem rolling pass process according to claim 1, wherein: in the step S4, the width of the K4 hole is W4 approximately equal to W+0-4 mm no matter the round flat steel or the rectangular flat steel is rolled, namely the width of the hole is set according to the width of a finished product.
  9. 9. A tandem rolling pass process for extremely wide range common flat steel according to claim 1 wherein the width of the K2 pass in S6 is determined by the product width W and the height K3, whether it is circular arc flat steel or rectangular flat steel.

Description

Flat steel continuous rolling pass process shared in extremely wide range Technical Field The invention relates to the technical field of metal pressure processing, in particular to a flat steel tandem rolling pass process which is used in a very wide range. Background At present, flat steel continuous rolling generally adopts round holes to connect with multiple pass flat rolls, then connects with a vertical rolling pass to roll the side surface shape of the flat steel, and then connects with one or two flat rolls to roll into the required size. Because the width and thickness coverage of the flat steel are large, the product span is large, the order quantity of a single product specification is relatively small, different incoming materials are needed for sections with different sizes, the specification is frequently changed in the production process of the flat steel product, the number of roller grooves required to be changed each time is large, and the frequent roller changing and groove changing impact on production is very large. Meanwhile, the spring flat steel in the production of flat steel products has very strict decarburization requirements, the roll and groove changing time is increased, the full decarburization phenomenon is very easy to generate to influence the quality of the flat steel, and therefore, the continuous rolling pass process of the flat steel is widely shared. Disclosure of Invention The invention aims to provide a flat steel tandem rolling pass process which is used in a very wide range, so as to solve the problems in the background technology. In order to achieve the purpose, the invention provides the technical scheme that the continuous rolling pass process for the flat steel, which is shared in an extremely wide range, comprises the following steps of: S1, initially rolling a round hole on the flat steel, wherein the base circle radius R0 of the round hole is determined by Hmax and Wmax of the flat steel, and the size of R0 is determined according to R0 (Wmax+0.8Hmax)/3, namely the initial round hole radius is determined by the maximum width and the maximum thickness of the flat steel, and can be determined according to the formula R0 (Wmax+0.8Hmax)/3. S2, when the minimum specification is produced, the shape of the hole type material is received to be the minimum value, and the height H0 of the hole type material is approximately equal to (Wmax+0.8Hmax)/3- (Hmax-Hmin)/5, and the width of the hole type material is equal to the height of the hole type material; s3, hole widening is carried out after the round holes are rolled, wherein K6+i, K6 and K5 are widening holes, K4 holes are width control holes, K3 holes are flat holes, K2 holes are forming holes and K1 shaping holes; s4, when rolling the circular arc flat steel, R4 is approximately equal to 0.5Hmax+4-6 mm, and when rolling the rectangular or right-angle flat steel, the K4 hole type is rolled by adopting a hole-free system; S5, the rolling piece is pressed down more when the small-width flat steel in the flat steel series products is rolled, the difference between the shape of the rolling piece and the required finished product is larger, and the rolling piece is leveled in the K3 hole after the K4 hole comes out, so that a leveling hole H3 is obtained; S6, when rolling the circular arc flat steel, rolling the rectangular or right-angle flat steel by adopting a flat roller, wherein after K2 grooved rolling, the shape of a rolled piece is close to a state meeting the requirement of a finished product; s7, shaping the rolled piece after the K2 rolling is finished through the K1 hole pattern, so that the thickness and the width of the flat steel can be ensured to accurately meet the requirements of finished products. Preferably, in the step S3, the i value is taken to be 0-3 according to the product requirement, which is mainly determined by the arrangement form of the production line, wherein i is taken as many as possible, so that the flexibility of the product can be ensured. Preferably, the flat hole H3 in the S5 is determined by a finished product H, H3 is approximately equal to H+0-3 mm, and after K3 pass rolling, the flat steel has the same shape as the finished product in width and has a higher height than the finished product. Preferably, when the arc flat steel is rolled in the step S6, the arc radius of the bottom of the K2 forming hole is R2, where r2=h/2+0-5 mm. Preferably, R0 is the base radius of the initial round hole, H6+i is K6+i-th wide hole height, H6 is K6-th wide hole height, H5 is K5-wide hole height, R4 is the arc radius of the bottom of the K4 controlled wide hole when rolling the arc flat steel, W4 is the K4 controlled wide hole width, H3 is the K3 flat hole height, R2 is the arc radius of the bottom of the K2 formed hole when rolling the arc flat steel, W2 is the K2 formed hole width, H is the thickness of a finished product, W is the width of the finished product, and R is the arc surface ra