CN115254952A

CN115254952A - Wire hole pattern design method suitable for 150 and 180 square blank shapes

Info

Publication number: CN115254952A
Application number: CN202210895410.1A
Authority: CN
Inventors: 诸葛宇明; 李迎雪; 缪忠; 季丙元
Original assignee: Changshu Longteng Special Steel Co Ltd
Current assignee: Changshu Longteng Special Steel Co Ltd
Priority date: 2022-07-28
Filing date: 2022-07-28
Publication date: 2022-11-01

Abstract

The invention relates to a wire rod hole pattern design method suitable for two blank shapes of 150 square and 180 square, wherein a 28-pass rolling mill is designed in total, a rough and medium rolling area is a 14-pass rolling mill, a pre-finish rolling area is a 4-pass rolling mill, a finish rolling area is a 10-pass rolling mill, a box type extension hole pattern system is adopted by a first-pass rolling mill and a fourth-pass rolling mill in the rough and medium rolling area, an oval-round hole pattern system is adopted by a fifth-fourteenth-pass rolling mill, and the extension coefficients of all passes are adjusted and reasonably distributed; when the specification of the produced blank is changed, only the roll gap and the rolling speed of the limited frame are adjusted, so that the extension coefficient is changed, the production can be continued, the seamless connection in production can be basically realized when the specification of the blank is changed, and meanwhile, the technical scheme saves the fixed asset investment of newly added hardware on a production line to the maximum extent, namely, only a lathe is used for improving the original pass of the blank, so that the pass system of the 180-square blank can be obtained.

Description

Wire hole pattern design method suitable for 150 and 180 square blank shapes

Technical Field

The invention relates to the technical field of high-speed wire rolling, in particular to a wire hole pattern design method suitable for 150 and 180 square billet shapes.

Background

According to the design principle of elongation coefficient, the rough and medium rolling area needs 14 passes when producing 150 square billets or 160 square billets, and the rough and medium rolling area needs 16 passes when producing 180 square billets. However, due to the limitation of the high-speed wire rod production line, new rolling passes cannot be added, and in general, two independent hole type processes need to be designed to adapt to the production of blanks with different specifications due to the large difference of the section sizes of the blanks with the two specifications. When the specification of a produced blank is changed, the production line has to interrupt production, and the rolling hole pattern is replaced within the free time, which usually takes 3 to 5 hours or even longer, and seriously influences the production of the production line. Moreover, different pass systems require almost twice the spare amount of tooling parts (such as rollers and rolling stands) so that when the specification of a blank is changed, a prepared rolling mill can be changed in time, and the production cost is increased.

Disclosure of Invention

The invention aims to provide a wire hole pattern design method suitable for 150 square and 180 square blank shapes, so that a 180 square blank hole pattern system can be compatible with the production of 150 square blanks without increasing new rolling mill passes.

In order to achieve the purpose, the invention adopts the technical scheme that:

a wire hole pattern design method suitable for two blank shapes of 150 square and 180 square is characterized in that 28-pass rolling mills are designed, wherein a rough and medium rolling area is a 14-pass rolling mill, a pre-finish rolling area is a 4-pass rolling mill, a finish rolling area is a 10-pass rolling mill, a box-type extension hole pattern system is adopted by a first-pass rolling mill and a fourth-pass rolling mill in the rough and medium rolling area, and an oval-round hole pattern system is adopted by a fifth-pass rolling mill and a tenth-pass rolling mill, so that the extension coefficients of all passes are adjusted and reasonably distributed.

Preferably, the elongation coefficients of the first-fourth pass rolling mills are 1.274, 1.330, 1.334 and 1.265 respectively.

Preferably, the elongation coefficients of the fifth-fourteenth rolling mills are 1.497, 1.329, 1.243, 1.378, 1.321, 1.306, 1.297, 1.250, 1.251 and 1.230 respectively.

Preferably, when 150 square billets are used for production, the box type holes of the first-pass rolling mill and the second-pass rolling mill only have the clamping effect on rolled pieces, and the reduction of the box type holes is 10 +/-1.0 mm.

Preferably, when 180 square blanks are adopted, the reduction amounts of the box type holes of the rolling mills in the first pass and the second pass are 46mm and 62.72mm respectively.

Preferably, when 180 square billets are used, the area of the end face of the rolled piece after the second pass is 134X 155mm, so that the rolled piece can enter the third pass for rolling.

Preferably, 150 square blanks and 180 square blanks are adopted, and the size of the rolled piece at the outlet of the fourth pass is phi 30 +/-0.6 mm.

Preferably, the roll gaps in the first-fourth rolling mills in the rough medium rolling area are respectively 30mm, 24mm, 16mm and 16mm.

Preferably, in the rough medium rolling area, the roll gap in the fifth-twelfth-pass rolling mill is gradually reduced, and the roll gap in the thirteenth-fourteenth-pass rolling mill is larger than that in the twelfth-pass rolling mill.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

after the technical scheme of the invention is implemented, when the specification of the produced blank is changed, a field operator only needs to adjust the roll gap and the rolling speed of the rolling mill with limited passes, so that the extension coefficient is changed, the production can be continued, the seamless connection in production can be basically realized when the specification of the blank is changed, meanwhile, the technical scheme saves the fixed asset investment of newly added hardware on a production line to the maximum extent, the new pass utilizes the original 150 square blank pass system to the maximum extent, namely, the pass system of the original corresponding pass can be obtained only by using a lathe to improve the pass system.

Drawings

Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily to scale. In the drawings:

FIG. 1 is a diagram showing the pass setting of the first-fourth pass rolling mill in the embodiment of the present invention;

fig. 2 is a hole pattern layout diagram of a fifth pass-fourteenth pass rolling mill in the embodiment of the invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

A hole pattern design method suitable for 150 and 180 square billets adopts 28-pass design in the original process design, wherein a rough and medium rolling area is 14 passes, a pre-finish rolling area is 4 passes, and a finish rolling area is 10 passes. The method is characterized in that small square billets with the section sizes of 150mm multiplied by 150mm and 180mm multiplied by 180mm are used as raw materials to produce high-speed wire rods with the specifications of phi 6.5 mm-phi 20 mm. The invention only relates to 14 passes of a rough and medium rolling area, and the hole pattern systems used in a pre-finishing rolling area and a finishing rolling area do not need to be adjusted so as to reduce the workload caused by the change of the hole pattern systems.

As shown in fig. 1 and fig. 2, the first-fourth pass rolling mill in the rough and medium rolling area of the present invention adopts a box-type extended pass system, the fifth-fourteenth pass rolling mill adopts an oval-round pass system, the elongation coefficients of the first-fourth pass rolling mill in the rough and medium rolling area are between 12 and 1.4, the specific values are 1.274, 1.330, 1.334 and 1.265, respectively, and the elongation coefficients of the fifth-fourteenth pass rolling mill in the rough and medium rolling area are between 1.2 and 1.5, and are 1.497, 1.329, 1.243, 1.378, 1.321, 1.306, 1.297, 1.250, 1.251 and 1.230, respectively. When 150 square blanks are adopted for production, the box-shaped pass of the first-pass rolling mill and the second-pass rolling mill only have a clamping effect on rolled pieces, the rolling reduction is within 10 +/-1.0 mm, and the purpose is that the rolled pieces can smoothly enter a third pass for rolling production under the condition of not rolling steel excessively; when 180 square billets are adopted, the reduction of the box-shaped pass of the rolling mill in the first pass and the second pass is 46mm and 62.72mm respectively, the reduction is large and is similar to a cogging pass, and the area of the end face of a rolled piece after the rolling in the second pass is 134 multiplied by 155mm, so that the rolled piece can enter the third pass for rolling. The sizes of the 150 square blank and the 180 square blank after the first two passes are basically similar, and the rolling reduction in the subsequent pass is ensured to be basically consistent.

By rolling with a 10-pass oval-round pass system, after rolling with a 14-pass rolling mill, the size of a rolled piece at the outlet of the fourteenth pass is within phi 30 +/-0.6 mm, and the rolled piece is determined to be larger than 30mm or smaller than 30mm according to different finished product specifications.

The roll gap values in the first-fourth rolling mills in the rough middle rolling area are respectively 30mm, 24mm, 16mm and 16mm; the roll gap value of the fifth-twelfth-pass rolling mill is gradually reduced, and the roll gap value of the thirteenth-fourteenth-pass rolling mill is larger than that of the twelfth pass; the roll gap values in the rolling mills from the fifth pass to the twelfth pass are 18mm, 16mm, 12mm, 11mm, 8.4 mm, 7.2mm, 7.0mm and 7.0mm in sequence, and the roll gap values in the rolling mills from the thirteenth pass to the fourteenth pass are 9.0mm and 8.0mm in sequence. The method aims to obtain more roll gap adjustment amount in the thirteenth pass and the fourteenth pass in the production process. Since the change in the elongation coefficient can only be effected by changing the roll gap and the speed, the speed is correspondingly changed in the different passes

When the device is used specifically, when the specification of the produced blank is changed, field operators only need to adjust the roll gap and the rolling speed of the rolling mill with limited passes, so that the elongation coefficient reaches a specified value, the production can be continued, and the seamless connection in production can be basically realized when the specification of the blank is changed.

The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the invention, and not to limit the scope of the invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.

Claims

1. A hole pattern design method suitable for wire rods in two blank shapes of 150 square and 180 square is characterized in that 28-pass rolling mills are designed, wherein a rough and medium rolling area is a 14-pass rolling mill, a pre-finish rolling area is a 4-pass rolling mill, a finish rolling area is a 10-pass rolling mill, a box type extension hole pattern system is adopted by a first-pass rolling mill and a fourth-pass rolling mill in the rough and medium rolling area, an oval-round hole pattern system is adopted by a fifth-fourteenth-pass rolling mill, and the extension coefficients of all passes are adjusted and reasonably distributed.

2. A wire hole pattern design method suitable for both 150 and 180 square billet shapes according to claim 1, wherein: the elongation coefficients of the first-fourth pass rolling mills are 1.274, 1.330, 1.334 and 1.265 respectively.

3. A wire hole pattern designing method suitable for both of 150 and 180 square billet shapes according to claim 1, characterized in that: the elongation coefficients of the fifth-fourteenth rolling mills are 1.497, 1.329, 1.243, 1.378, 1.321, 1.306, 1.297, 1.250, 1.251 and 1.230 respectively.

4. A wire hole pattern designing method suitable for both of 150 and 180 square billet shapes according to claim 1, characterized in that: when 150 square billets are used for production, the box-type hole patterns of the rolling mill in the first pass and the second pass only have the clamping effect on rolled pieces, and the rolling reduction is within 10 +/-1.0 mm.

5. A wire hole pattern design method suitable for both 150 square billets and 180 square billets as claimed in claim 1, wherein the reduction of the box type of the first pass rolling mill and the second pass rolling mill is 46mm and 62.72mm respectively when 180 square billets are used.

6. A wire pass design method for both 150 and 180 square billets as claimed in claim 1, characterised in that 180 square billets are used and the rolled end surface area after the first and second passes is 134 x 155mm to allow for the third pass.

7. A wire hole pattern design method suitable for both 150-square and 180-square blank shapes according to claim 1, characterized in that 150-square blanks and 180-square blanks are adopted, and the rolled piece size at the outlet of the fourteenth pass is within phi 30 +/-0.6 mm.

8. A wire hole pattern design method suitable for both 150 and 180 square billets as claimed in claim 1, wherein the roll gap values in the first-fourth pass rolling mill in the rough medium rolling area are 30mm, 24mm, 16mm and 16mm respectively.

9. A wire hole pattern design method suitable for both 150 and 180 square billets as claimed in claim 1, wherein the roll gap values of the fifth-twelfth rolling mill in the rough medium rolling area are gradually reduced, and the roll gap values of the thirteenth-fourteenth rolling mill are larger than those of the twelfth rolling mill.