A flat steel continuous rolling groove process widely used in a wide range

Abstract

The present application relates to the technical field of metal pressure processing, and discloses a wide-range shared flat steel continuous rolling groove process, a set of flat steel groove can produce most of the flat steel specifications, and the roller does not need to be replaced during the replacement of the flat steel specifications, and only the roll gap needs to be adjusted to realize the replacement of the specifications, so that the number of occupied rolling mills is greatly reduced, the wide-range shared flat steel continuous rolling groove process realizes the quick replacement of the specifications, is particularly favorable for the production of spring flat steel, reduces the performance decline or even the total decarburization phenomenon caused by the increase of the decarburization layer depth due to the prolonged time in the furnace caused by the replacement of the specifications, and is favorable for the stability of the performance of the spring flat steel, the wide-range shared flat steel continuous rolling groove process realizes the quick replacement between the specifications, is very suitable for the production organization of small batches and multiple specifications of the flat steel, can flexibly arrange the production specifications, and meets the production requirements of small batch orders.

Description

Technical Field

[0001] This invention relates to the field of metal pressure processing technology, specifically to a widely applicable flat steel continuous rolling mill process. Background Technology

[0002] Currently, flat steel continuous rolling typically employs a multi-pass flat roll forming process, followed by a vertical rolling pass to shape the side profile of the flat steel, and then one or two more flat rolls to achieve the required dimensions. Due to the wide range of widths and thicknesses of flat steel, the large product span, and the relatively small order quantities for individual product specifications, different cross-sections require different incoming materials. This leads to frequent specification changes during flat steel production, requiring the replacement of numerous roll grooves each time, which significantly impacts production. Furthermore, the production of spring flat steel, a type of flat steel product, demands stringent decarburization requirements. Changing rolls and grooves increases furnace time, easily resulting in complete decarburization and affecting flat steel quality. Therefore, we propose a widely applicable flat steel continuous rolling pass process. Summary of the Invention

[0003] The purpose of this invention is to provide a widely applicable flat steel continuous rolling mill pass process to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a widely applicable flat steel continuous rolling mill process, wherein the widely applicable flat steel continuous rolling mill process includes the following steps:

[0005] S1. Initially, a circular hole is rolled on the flat steel. The radius R0 of the basic circle of the circular hole is determined by the Hmax and Wmax of the flat steel. The size of R0 is determined by the formula R0≈(Wmax+0.8Hmax) / 3, that is, the initial radius of the circular hole is determined by the maximum width and maximum thickness of the flat steel. It can be determined by the formula R0≈(Wmax+0.8Hmax) / 3.

[0006] S2. When producing the smallest specification, the hole shape is minimized. Generally, the hole height H0 ≈ (Wmax + 0.8Hmax) / 3 - (Hmax - Hmin) / 5, and the width is equal to the height.

[0007] S3. After the rolling of the round hole is completed, the hole shape is widened. Among them, K6+i, K6, and K5 are widened hole shapes, K4 is a width control hole, K3 is a flat hole shape, K2 is a forming hole, and K1 is a shaping hole.

[0008] S4. When rolling round arc flat steel, R4≈0.5Hmax+4~6mm. When rolling rectangular or right angle flat steel, this K4 pass is rolled using a non-pass rolling system.

[0009] When rolling small-width flat bars in the flat bar series products, the S5 and K4 passes have a relatively large reduction, and the shape of the rolled piece differs greatly from the required finished product. After the K4 pass comes out, the rolled piece is flattened in the K3 pass to obtain the flattened hole H3.

[0010] S6. When rolling arc flat steel, rectangular or right-angle flat steel is rolled with flat rolls. After rolling through the K2 die, the shape of the rolled piece is close to meeting the requirements of the finished product.

[0011] S7. After the K2 rolling is completed, the rolled piece is shaped through the K1 die to ensure that the thickness and width of the flat steel accurately meet the finished product requirements.

[0012] Preferably, in S3, the value of i is 0-3 according to product requirements, mainly determined by the production line layout. Taking as many values ​​as possible for i can ensure product flexibility.

[0013] Preferably, the flattening hole H3 in S5 is determined by the finished product H, H3≈H+0~3mm. After rolling with the K3 die, the flat steel has the same width as the finished product, but its height is higher than that of the finished product.

[0014] Preferably, in the S6 process of rolling the arc flat steel, the bottom arc radius of the K2 forming hole is R2, where R2 = H / 2 + 0~5mm.

[0015] Preferably, R0 is the initial circular hole base circle radius, H6+i is the height of the K6+ith width expansion hole, H6 is the height of the K6th width expansion hole, H5 is the height of the K5 width expansion hole, R4 is the bottom arc radius of the K4 width control hole when rolling the arc flat steel, W4 is the width of the K4 width control hole, H3 is the height of the K3 flat hole, R2 is the bottom arc radius of the K2 forming hole when rolling the arc flat steel, W2 is the width of the K2 forming hole, H is the finished product thickness, W is the finished product width, and R is the radius of the arc surface of the arc flat steel.

[0016] Preferably, the radius of the arc surface of the arc flat steel is R≈H / 2.

[0017] Preferably, flat rollers are used for rolling the initial round hole to the K4 pass on the flat steel, and the pressing down in each pass is distributed according to the rolling thickness.

[0018] Preferably, the rectangular flat steel or right-angle flat steel is produced using a flat roll vertical rolling mill.

[0019] Preferably, in S4, whether rolling arc flat steel or rectangular flat steel, the width of the K4 hole is W4≈W+0~4mm, that is, the width of the hole is set according to the finished product width.

[0020] Preferably, in S6, whether it is a circular arc flat steel or a rectangular flat steel, the width of the K2 hole is determined by the finished product width W and the K3 height.

[0021] Compared with the prior art, the present invention provides a flat steel continuous rolling pass process that can be used in a wide range of applications, and has the following beneficial effects:

[0022] 1. This widely applicable flat steel continuous rolling mill process allows one set of flat steel dies to produce most flat steel specifications. When changing flat steel specifications, there is no need to change rolls; only the roll gap needs to be adjusted to achieve specification change, which greatly reduces the number of rolls required for the rolling mill.

[0023] 2. This widely applicable flat steel continuous rolling mill process enables rapid specification changes, which is particularly beneficial for the production of spring flat steel. It reduces the occurrence of performance degradation or even complete decarburization caused by prolonged furnace time due to specification changes, thus contributing to the stability of spring flat steel performance.

[0024] 3. This widely applicable flat steel continuous rolling mill process allows for quick changes between specifications, making it ideal for small-batch, multi-specification flat steel production. It allows for flexible arrangement of production specifications to meet the requirements of small-batch order production. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the flat steel continuous rolling pass pattern of the present invention;

[0026] Figure 2 This is a schematic diagram showing the shared hole pattern for 30mm×100mm and 10mm×60mm circular arc flat steel bars of the present invention. Detailed Implementation

[0027] Example 1: As Figure 1-2 As shown, the present invention provides a technical solution: a widely applicable flat steel continuous rolling mill process, which includes the following steps:

[0028] S1. Initially, a circular hole is rolled on the flat steel. The radius R0 of the basic circle of the circular hole is determined by the Hmax and Wmax of the flat steel. The size of R0 is determined by the formula R0≈(Wmax+0.8Hmax) / 3, that is, the initial radius of the circular hole is determined by the maximum width and maximum thickness of the flat steel. It can be determined by the formula R0≈(Wmax+0.8Hmax) / 3.

[0029] S2. When producing the smallest specification, the hole shape is minimized. Generally, the hole height H0 ≈ (Wmax + 0.8Hmax) / 3 - (Hmax - Hmin) / 5, and the width is equal to the height.

[0030] S3. After the rolling of the round hole is completed, the hole shape is widened. Among them, K6+i, K6, and K5 are widened hole shapes, K4 is a width control hole, K3 is a flat hole shape, K2 is a forming hole, and K1 is a shaping hole.

[0031] S4. When rolling round arc flat steel, R4≈0.5Hmax+4~6mm. When rolling rectangular or right angle flat steel, this K4 pass is rolled using a non-pass rolling system.

[0032] When rolling small-width flat bars in the flat bar series products, the S5 and K4 passes have a relatively large reduction, and the shape of the rolled piece differs greatly from the required finished product. After the K4 pass comes out, the rolled piece is flattened in the K3 pass to obtain the flattened hole H3.

[0033] S6. When rolling arc flat steel, rectangular or right-angle flat steel is rolled with flat rolls. After rolling through the K2 die, the shape of the rolled piece is close to meeting the requirements of the finished product.

[0034] S7. After the K2 rolling is completed, the rolled piece is shaped through the K1 die to ensure that the thickness and width of the flat steel accurately meet the finished product requirements.

[0035] In S3, the value of i ranges from 0 to 3 depending on the product requirements, mainly determined by the production line layout. Taking as many values ​​as possible for i can ensure product flexibility.

[0036] In S5, the flat hole H3 is determined by the finished product H, H3≈H+0~3mm. After rolling through the K3 die, the flat steel has the same width as the finished product, but its height is higher than the finished product.

[0037] When rolling arc flat steel in S6, the radius of the arc at the bottom of the K2 forming hole is R2, where R2 = H / 2 + 0~5mm.

[0038] R0 is the initial radius of the base circle of the circular hole, H6+i is the height of the width expansion hole of the K6+ith pass, H6 is the height of the width expansion hole of the K6th pass, H5 is the height of the width expansion hole of the K5th pass, R4 is the bottom radius of the K4 width control hole when rolling the circular arc flat steel, W4 is the width of the K4 width control hole, H3 is the height of the K3 flat hole, R2 is the bottom radius of the K2 forming hole when rolling the circular arc flat steel, W2 is the width of the K2 forming hole, H is the thickness of the finished product, W is the width of the finished product, and R is the radius of the circular arc surface of the circular arc flat steel.

[0039] The radius of the arc surface of the flat steel is approximately R ≈ H / 2.

[0040] Initially, flat rollers are used to roll the flat steel from the round hole to the K4 pass, and the reduction in each pass is allocated according to the rolling thickness.

[0041] When producing rectangular or right-angled flat steel, flat rolls are used for vertical rolling.

[0042] In S4, whether rolling round or rectangular flat steel, the width of the K4 die is W4≈W+0~4mm, which means that the width of the die is set according to the finished product width.

[0043] In S6, whether it is a round or rectangular flat steel, the width of the K2 hole is determined by the finished width W and the height of K3.

[0044] Example 2: This widely applicable flat steel continuous rolling mill process includes the following steps:

[0045] S1. Initially, a circular hole is rolled into the flat steel. The base circle radius R0 of the hole is determined by the maximum width (Hmax) and maximum width (Wmax) of the flat steel. The dimension of R0 is based on R0≈(Wmax+0.8Hmax) / 3, that is, the initial radius of the circular hole is determined by the maximum width of the flat steel. and The maximum thickness can be determined using the formula R0≈(Wmax+0.8Hmax) / 3.

[0046] S2. When producing the smallest specification, the hole shape is minimized. Generally, the hole height H0 ≈ (Wmax + 0.8Hmax) / 3 - (Hmax - Hmin) / 5, and the width is equal to the height.

[0047] S3. After the rolling of the round hole is completed, the hole shape is widened. Among them, K6+i, K6, and K5 are widened hole shapes, K4 is a width control hole, K3 is a flat hole shape, K2 is a forming hole, and K1 is a shaping hole.

[0048] S4. When rolling arc flat steel, R4≈0.5Hmax+4~6mm. When rolling rectangular or right-angle flat steel, whether rolling arc flat steel or rectangular flat steel, the width of K4 die is W4≈W+0~4mm. That is, the width of this die is set according to the finished product width. This K4 die is rolled using a dieless rolling system.

[0049] When rolling small-width flat bars in the flat bar series products, the S5 and K4 passes have a relatively large reduction, and the shape of the rolled piece differs greatly from the required finished product. After the K4 pass comes out, the rolled piece is flattened in the K3 pass to obtain the flattened hole H3.

[0050] S6. When rolling arc flat steel, rectangular or right-angle flat steel is rolled with flat rolls. Whether it is arc flat steel or rectangular flat steel, the width of K2 die is determined by the finished product width W and K3 height. After rolling through K2 die, the shape of the rolled piece is close to meeting the finished product requirements.

[0051] S7. After the K2 rolling is completed, the rolled piece is shaped through the K1 die to ensure that the thickness and width of the flat steel accurately meet the finished product requirements.

[0052] In S3, the value of i ranges from 0 to 3 depending on the product requirements, mainly determined by the production line layout. Taking as many values ​​as possible for i can ensure product flexibility.

[0053] In S5, the flat hole H3 is determined by the finished product H, H3≈H+0~3mm. After rolling through the K3 die, the flat steel has the same width as the finished product, but its height is higher than the finished product.

[0054] When rolling arc flat steel in S6, the radius of the arc at the bottom of the K2 forming hole is R2, where R2 = H / 2 + 0~5mm.

[0055] Where R0 is the initial radius of the base circle of the circular hole, H6+i is the height of the width-expanding hole in the K6+i pass, H6 is the height of the width-expanding hole in the K6 pass, H5 is the height of the width-expanding hole in the K5 pass, R4 is the bottom radius of the width-controlling hole in the K4 pass when rolling the circular arc flat steel, W4 is the width of the width-controlling hole in the K4 pass, H3 is the height of the flat hole in the K3 pass, R2 is the bottom radius of the forming hole in the K2 pass when rolling the circular arc flat steel, W2 is the width of the forming hole in the K2 pass, H is the thickness of the finished product, W is the width of the finished product, and R is the radius of the circular arc surface of the circular arc flat steel. The radius of the circular arc surface of the circular arc flat steel R≈H / 2.

[0056] This widely applicable flat steel continuous rolling mill process produces flat steel with a maximum size of 30mm × 100mm and a minimum size of 10mm × 60mm. The process is implemented as follows:

[0057] The initial circular hole size R0≈(Wmax+0.8Hmax) / 3=(100+24) / 3=41.33mm, so the initial circular hole base circle size R0 is 82.67mm. When producing the smallest size 10mm×60mm arc flat steel, the arc R4≈0.5Hmax+4mm is used when producing arc flat steel with K4 hole pattern. The largest size of this flat steel is 30mm*100mm, so R4≈15+4=19mm. This hole pattern is used for other sizes of arc flat steel. When producing flat steel with a width of 100mm, the height of this hole pattern is set to 100mm. The compression of this hole pattern is very small. When producing flat steel with a width of 60mm, the height of this hole pattern is designed to be 60mm. The compression is very large. Flat roll vertical rolling is used to produce rectangular flat steel or right angle flat steel.

[0058] Flat rollers are used from the initial round hole to the K4 pass, and the reduction in each pass is allocated according to the rolling thickness.

[0059] The K3 pass is a flattening pass. Its function is to flatten any unevenness in the K4 pass due to pressing, eliminating bulges and facilitating entry into the K2 pass for forming. The thickness is set to 32mm for producing 30mm × 100mm flat steel and 12mm for producing 10mm × 60mm flat steel.

[0060] K2 hole is a forming hole, and its shape and size are basically the same as the finished product. When producing arc flat steel, the arc R2 = H / 2 + 0~5mm; when producing rectangular or right-angle flat steel, a flat roller can be used.

[0061] Because a central bulge will occur when K2 is pressed down, it needs to be rolled again to produce the finished product. The finished product is produced using flat rollers, and its height is the finished product height. The width of K2 after being rolled and widened by K1 is the finished product width.

[0062] As can be seen from the above scheme, when producing rectangular or right-angled flat steel, the flat steel continuous rolling pass process does not require changing rolls. Producing 30mm×100mm and 10mm×60mm can be achieved simply by adjusting the material shape. All specifications between these two extreme specifications can be produced by adjusting the mill roll gap.

[0063] When producing curved flat steel, the arc radius (R) of the curved flat steel varies due to different finished product thicknesses. Therefore, it is necessary to change the K2 die slot. When producing curved flat steel between 30mm×100mm and 10mm×60mm, only the K2 die slot needs to be changed. Other stands can be adjusted by adjusting the roll gap to achieve the production of all specifications of curved flat steel between 30mm×100mm and 10mm×60mm. In contrast, the traditional method requires at least 9 stands of rolling mills from the round hole to the finished product hole.

[0064] All specifications between these two can be adjusted in terms of material shape according to the method of this invention, thereby achieving universality across the entire series.

[0065] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A widely applicable flat steel continuous rolling mill process, characterized in that: The widely used flat steel continuous rolling mill process includes the following steps: S1. Initially, a circular hole is rolled on the flat steel. The radius R0 of the basic circle of the circular hole is determined by the Hmax and Wmax of the flat steel. The size of R0 is determined according to R0≈(Wmax+0.8Hmax) / 3, that is, the initial radius of the circular hole is determined by the maximum width and maximum thickness of the flat steel, and is determined according to the formula R0≈(Wmax+0.8Hmax) / 3. S2. When producing the smallest specification, the hole shape is minimized. Generally, the hole height H0 ≈ (Wmax + 0.8Hmax) / 3 - (Hmax - Hmin) / 5, and the width is equal to the height. S3. After the rolling of the round hole is completed, the hole shape is widened. Among them, K6+i, K6, and K5 are widened hole shapes, K4 is a width control hole, K3 is a flat hole shape, K2 is a forming hole, and K1 is a shaping hole. S4. When rolling round arc flat steel, R4≈0.5Hmax+4~6mm. When rolling rectangular or right angle flat steel, this K4 pass is rolled using a non-pass rolling system. When rolling small-width flat bars in the flat bar series products, the S5 and K4 passes have a relatively large reduction, and the shape of the rolled piece differs greatly from the required finished product. After the K4 pass comes out, the rolled piece is flattened in the K3 pass to obtain the flattened hole H3. S6. When rolling arc flat steel, rectangular or right-angle flat steel is rolled with flat rolls. After rolling through the K2 die, the shape of the rolled piece is close to meeting the requirements of the finished product. S7. After rolling K2, the rolled piece is shaped through the K1 pass. In S3, the value of i ranges from 0 to 3 depending on the product requirements, and is mainly determined by the production line layout. Among these, i can take multiple values.

2. The widely applicable flat steel continuous rolling mill process according to claim 1, characterized in that: The flattening hole H3 in S5 is determined by the finished product H, H3≈H+0~3mm. After rolling through the K3 die, the flat steel has the same width as the finished product, but its height is higher than that of the finished product.

3. The widely applicable flat steel continuous rolling mill process according to claim 2, characterized in that: When rolling the arc flat steel in S6, the radius of the bottom arc of the K2 forming hole is R2, where R2 = H / 2 + 0~5mm.

4. The widely applicable flat steel continuous rolling mill process according to claim 1, characterized in that: R0 is the initial circular hole base circle radius, H6+i is the width expansion hole height of the K6+ith pass, H6 is the width expansion hole height of the K6th pass, H5 is the width expansion hole height of the K5th pass, R4 is the bottom arc radius of the K4 width control hole when rolling arc flat steel, W4 is the width of the K4 width control hole, H3 is the height of the K3 flat hole, R2 is the bottom arc radius of the K2 forming hole when rolling arc flat steel, W2 is the width of the K2 forming hole, H is the finished product thickness, W is the finished product width, and R is the arc surface radius of the arc flat steel.

5. The widely applicable flat steel continuous rolling mill process according to claim 4, characterized in that: The radius of the arc surface of the circular flat steel is R≈H / 2.

6. The widely applicable flat steel continuous rolling mill process according to claim 1, characterized in that: The initial rolling process on the flat steel, from the round hole to the K4 pass, uses flat rollers, and the reduction in each pass is allocated according to the rolling thickness.

7. The widely applicable flat steel continuous rolling mill process according to claim 1, characterized in that: The rectangular flat steel or right-angle flat steel is produced by flat roller vertical rolling.

8. The widely applicable flat steel continuous rolling mill process according to claim 1, characterized in that: In S4, whether rolling arc flat steel or rectangular flat steel, the width of the K4 hole is W4≈W+0~4mm, that is, the width of the hole is set according to the finished product width.

9. The widely applicable flat steel continuous rolling mill process according to claim 1, characterized in that: In S6, whether it is a circular or rectangular flat steel, the width of the K2 hole is determined by the finished width W and the height of K3.

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