A method for long-life rolling with four rolls and two sets of passes in a transverse three-roll mill.

Abstract

This invention discloses a long-life rolling method for a four-roll, two-pass mill in a transverse three-roll mill. The rolling method includes the following steps: real-time monitoring of whether the current intermediate roll and / or the current finishing roll meet the rolling requirements; if they do, rolling continues; if not, other intermediate rolls or finishing rolls are used for rolling; if all intermediate rolls and finishing rolls do not meet the rolling requirements, the working intermediate roll is removed, and a spare intermediate roll is used as the working roll; simultaneously, the upper and lower rolls are exchanged before rolling continues. This invention adopts a completely symmetrical design of the upper and lower roll passes, configuring an appropriate number of passes according to the degree of wear, with the number of passes increasing sequentially from front to back. When one set of passes wears to its minimum roll diameter, only one intermediate roll needs to be replaced, and the original upper and lower rolls are swapped, thus forming a complete new roll system, greatly reducing production costs and creating profits for enterprises.

Description

Technical Field

[0001] This invention relates to a long-life rolling method for a four-roll, two-pass mill in a transverse three-roll mill. Background Technology

[0002] A transverse three-roll mill typically includes three rolls arranged side-by-side within a frame: an upper roll, a middle roll, and a lower roll. Each roll has multiple grooves coaxially arranged on it. The grooves of the upper roll and the middle roll, or the lower roll and the middle roll, combine to form a roll hole. The workpiece is rolled alternately from the upper and lower roll gaps to the left or right to produce a workpiece with predetermined requirements.

[0003] The traditional roll pass design of existing three-roll mills all use conjugate holes. After a set of rolls (3 rolls) wears out, as long as any one of the holes wears down to the minimum roll diameter, it is scrapped and a completely new set of rolls needs to be replaced. Summary of the Invention

[0004] To overcome the above-mentioned defects, the present invention provides a long-life rolling method for a four-roll, two-pass mill in a transverse three-roll mill, which greatly reduces production costs.

[0005] To achieve the above objectives, the present invention provides a four-roll, two-pass long-life rolling method for a transverse three-roll mill, comprising three rolls arranged side-by-side in a frame: an upper roll, a middle roll, and a lower roll, as well as a spare middle roll.

[0006] The grooves on the surfaces of the upper and lower rolls are completely symmetrical; the grooves on the surface of the middle roll are correspondingly arranged to the grooves on the surfaces of the upper and lower rolls; the grooves of the upper and middle rolls combine to form the upper rolling hole; the grooves of the lower and middle rolls combine to form the lower rolling hole.

[0007] The rolling holes are arranged in descending order of size, forming a roughing zone, an intermediate rolling zone, and a finishing zone;

[0008] The roughing zone has at least two roughing holes of different sizes; the intermediate rolling zone has two intermediate rolling holes of the same size; and the finishing rolling zone has three finishing holes of the same size.

[0009] During the rolling process, the workpiece is rolled alternately from the upper and lower rolling holes;

[0010] The rolling method includes the following steps: real-time monitoring of whether the current intermediate rolling hole and / or the current finishing rolling hole meet the rolling requirements; if they meet the requirements, rolling continues; if they do not meet the requirements, other intermediate rolling holes or finishing rolling holes are replaced for rolling; if all intermediate rolling holes and finishing rolling holes do not meet the rolling requirements, the working intermediate rolling roll is removed and the spare intermediate rolling roll is used as the working rolling roll; at the same time, the upper rolling roll and the lower rolling roll are exchanged and rolling continues.

[0011] Furthermore, the rolling method specifically includes:

[0012] 1) Take the rolled piece and pass it through the roughing holes in the roughing zone alternately from largest to smallest for roughing;

[0013] 2) The rough-rolled workpiece is passed through the first intermediate rolling mill hole in the intermediate rolling zone for intermediate rolling;

[0014] 3) The rolled piece after intermediate rolling is then finished rolling through the first finishing hole in the finishing rolling zone;

[0015] 4) Determine whether the first finishing hole after rolling meets the rolling requirements; if it meets all the rolling requirements, return to step 1.

[0016] If the rolling requirements are not met, proceed with the rolling process as follows:

[0017] 5) Take the rolled piece and pass it through the roughing holes in the roughing zone alternately from largest to smallest for roughing;

[0018] 6) The rough-rolled workpiece is passed through the first intermediate rolling mill hole in the intermediate rolling zone for intermediate rolling;

[0019] 7) The rolled piece after intermediate rolling is then finished rolling through the second finishing hole in the finishing rolling zone;

[0020] 8) Determine whether the first intermediate rolling hole after rolling meets the rolling requirements; if it meets the rolling requirements, return to step 5;

[0021] If the rolling requirements are not met, proceed with the rolling process as follows:

[0022] 9) Take the rolled piece and pass it through the roughing holes in the roughing zone alternately from largest to smallest for roughing;

[0023] 10) The rough-rolled workpiece is then passed through the second intermediate rolling mill hole in the intermediate rolling zone for intermediate rolling;

[0024] 11) The rolled piece after intermediate rolling is then finished rolling through the second finishing hole in the finishing rolling zone;

[0025] 12) Determine whether the second finishing hole after rolling meets the rolling requirements; if it meets the rolling requirements, return to step 9;

[0026] If the rolling requirements are not met, proceed with the rolling process as follows:

[0027] 13) Take the rolled piece and pass it through the roughing holes in the roughing zone alternately from largest to smallest for roughing;

[0028] 14) The rough-rolled workpiece is then passed through the second intermediate rolling mill hole in the intermediate rolling zone for intermediate rolling;

[0029] 15) The rolled piece after intermediate rolling is then finished rolling through the third finishing hole in the finishing rolling zone;

[0030] 16) Determine whether the rolled third finishing mill lower hole or the second intermediate mill upper hole meets the rolling requirements; if both meet the rolling requirements, return to step 13;

[0031] If the rolling requirements are not met, the working intermediate roll is removed and the spare intermediate roll is used as the working roll; at the same time, the upper and lower rolls are exchanged and then the process is returned to step 1 for reverse rolling.

[0032] Furthermore, there are three roughing holes: the first roughing hole > the second roughing hole > the third roughing hole.

[0033] Furthermore, the third roughing pass is a T-shaped pass.

[0034] Furthermore, both the first and second intermediate rolling holes are trapezoidal rolling holes.

[0035] This invention employs a completely symmetrical design for the upper and lower roller passes. The appropriate number of passes is configured based on the degree of wear, with the number increasing sequentially from front to back. Once a set of passes has worn down to its minimum diameter, only one middle roller needs to be replaced, and the original upper and lower rollers are swapped, resulting in a completely new roller system. Compared to existing conjugate pass technology, its advantages include increasing the utilization rate of the original pass rolls by approximately 50%, significantly reducing production costs, and generating profits for enterprises. Attached Figure Description

[0036] Figure 1 This is a schematic diagram illustrating the hole type selection for the present invention. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and specific examples, so that those skilled in the art can better understand and implement the present invention, but the embodiments are not intended to limit the present invention.

[0038] The present invention provides a four-roll, two-pass long-life rolling method for a transverse three-roll mill, comprising three rolls (upper, middle, and lower) arranged side-by-side within a frame, and a spare middle roll.

[0039] The grooves on the surfaces of the upper and lower rolls are completely symmetrical; the grooves on the surface of the middle roll are correspondingly arranged to the grooves on the surfaces of the upper and lower rolls; the grooves of the upper and middle rolls combine to form the upper rolling hole; the grooves of the lower and middle rolls combine to form the lower rolling hole.

[0040] The rolling holes are arranged in descending order of size, forming a roughing zone, an intermediate rolling zone, and a finishing zone;

[0041] The roughing zone has at least two roughing holes of different sizes; the intermediate rolling zone has two intermediate rolling holes of the same size; and the finishing rolling zone has three finishing holes of the same size.

[0042] During the rolling process, the workpiece is rolled alternately from the upper and lower rolling holes;

[0043] The rolling method is specifically as follows:

[0044] 1) Take the rolled piece and pass it through the roughing holes in the roughing zone alternately from largest to smallest for roughing;

[0045] 2) The rough-rolled workpiece is passed through the first intermediate rolling mill hole in the intermediate rolling zone for intermediate rolling;

[0046] 3) The rolled piece after intermediate rolling is then finished rolling through the first finishing hole in the finishing rolling zone;

[0047] 4) Determine whether the first finishing hole after rolling meets the rolling requirements; if it meets all the rolling requirements, return to step 1.

[0048] If the rolling requirements are not met, proceed with the rolling process as follows:

[0049] 5) Take the rolled piece and pass it through the roughing holes in the roughing zone alternately from largest to smallest for roughing;

[0050] 6) The rough-rolled workpiece is passed through the first intermediate rolling mill hole in the intermediate rolling zone for intermediate rolling;

[0051] 7) The rolled piece after intermediate rolling is then finished rolling through the second finishing hole in the finishing rolling zone;

[0052] 8) Determine whether the first intermediate rolling hole after rolling meets the rolling requirements; if it meets the rolling requirements, return to step 5;

[0053] If the rolling requirements are not met, proceed with the rolling process as follows:

[0054] 9) Take the rolled piece and pass it through the roughing holes in the roughing zone alternately from largest to smallest for roughing;

[0055] 10) The rough-rolled workpiece is then passed through the second intermediate rolling mill hole in the intermediate rolling zone for intermediate rolling;

[0056] 11) The rolled piece after intermediate rolling is then finished rolling through the second finishing hole in the finishing rolling zone;

[0057] 12) Determine whether the second finishing hole after rolling meets the rolling requirements; if it meets the rolling requirements, return to step 9;

[0058] If the rolling requirements are not met, proceed with the rolling process as follows:

[0059] 13) Take the rolled piece and pass it through the roughing holes in the roughing zone alternately from largest to smallest for roughing;

[0060] 14) The rough-rolled workpiece is then passed through the second intermediate rolling mill hole in the intermediate rolling zone for intermediate rolling;

[0061] 15) The rolled piece after intermediate rolling is then finished rolling through the third finishing hole in the finishing rolling zone;

[0062] 16) Determine whether the rolled third finishing mill lower hole or the second intermediate mill upper hole meets the rolling requirements; if both meet the rolling requirements, return to step 13;

[0063] If the rolling requirements are not met, the working intermediate roll is removed and the spare intermediate roll is used as the working roll; at the same time, the upper and lower rolls are exchanged and then the process is returned to step 1 for reverse rolling.

[0064] like Figure 1 As shown, this invention employs a completely symmetrical design for the upper and lower roll passes. The appropriate number of passes is configured based on the degree of wear, with the number of passes increasing sequentially from front to back. Once the new roll system (as shown in the figure, the first rolling cycle uses five passes: K11-1, K10-1, K9-1, K8-1, and K7-1) has worn down to its minimum roll diameter, only one middle roll needs to be replaced. The original upper and lower rolls are then swapped, and five new passes (K11-2, K10-2, K9-2, K8-2, and K7-2) are selected for rolling, resulting in a completely new roll system. Compared to existing conjugate pass technology, its advantage is that it increases the utilization rate of the original pass rolls by approximately 50%, significantly reducing production costs and generating profits for the enterprise.

[0065] The above-described embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. A method for long-life rolling with four rolls and two sets of passes in a transverse three-roll mill, characterized in that, It includes three rolls arranged side by side, one above the other, one in the middle and one below, within the frame, as well as a spare middle roll; The grooves on the surfaces of the upper and lower rolls are completely symmetrical; the grooves on the surface of the middle roll are correspondingly arranged to the grooves on the surfaces of the upper and lower rolls; the grooves of the upper and middle rolls combine to form the upper rolling hole; the grooves of the lower and middle rolls combine to form the lower rolling hole. The rolling holes are arranged in descending order of size, forming a roughing zone, an intermediate rolling zone, and a finishing zone; The roughing zone has at least two roughing holes of different sizes; the intermediate rolling zone has two intermediate rolling holes of the same size; and the finishing rolling zone has three finishing holes of the same size. During the rolling process, the workpiece is rolled alternately from the upper and lower rolling holes; The rolling method includes the following steps: real-time monitoring of whether the current intermediate rolling hole and / or the current finishing rolling hole meet the rolling requirements; if they meet the requirements, rolling continues; if they do not meet the requirements, other intermediate rolling holes or finishing rolling holes are replaced for rolling; if all intermediate rolling holes and finishing rolling holes do not meet the rolling requirements, the working intermediate rolling roll is removed and the spare intermediate rolling roll is used as the working rolling roll; at the same time, the upper rolling roll and the lower rolling roll are exchanged and rolling continues.

2. The four-roll, two-pass long-life rolling method for a transverse three-roll mill as described in claim 1, characterized in that, The rolling method is specifically as follows: 1) Take the rolled piece and pass it through the roughing holes in the roughing zone alternately from largest to smallest for roughing; 2) The rough-rolled workpiece is passed through the first intermediate rolling mill hole in the intermediate rolling zone for intermediate rolling; 3) The rolled piece after intermediate rolling is then finished through the first finishing hole in the finishing rolling zone; 4) Determine whether the first finishing hole after rolling meets the rolling requirements; if it meets all the rolling requirements, return to step 1); If the rolling requirements are not met, proceed with the rolling process as follows: 5) Take the rolled piece and pass it through the roughing holes in the roughing zone alternately from largest to smallest for roughing; 6) The rough-rolled workpiece is then passed through the first intermediate rolling mill hole in the intermediate rolling zone for intermediate rolling; 7) The rolled piece after intermediate rolling is then finished rolling through the second finishing hole in the finishing rolling zone; 8) Determine whether the first intermediate rolling hole after rolling meets the rolling requirements; if it meets the rolling requirements, return to step 5); If the rolling requirements are not met, proceed with the rolling process as follows: 9) Take the rolled piece and pass it through the roughing holes in the roughing zone alternately from largest to smallest for roughing; 10) The rough-rolled workpiece is then passed through the second intermediate rolling mill hole in the intermediate rolling zone for intermediate rolling; 11) The rolled piece after intermediate rolling is then finished rolling through the second finishing hole in the finishing rolling zone; 12) Determine whether the second finishing hole after rolling meets the rolling requirements; if it meets the rolling requirements, return to step 9); If the rolling requirements are not met, proceed with the rolling process as follows: 13) Take the rolled piece and pass it through the roughing holes in the roughing zone alternately from largest to smallest for roughing; 14) The rough-rolled workpiece is then passed through the second intermediate rolling mill hole in the intermediate rolling zone for intermediate rolling; 15) The rolled piece after intermediate rolling is then finished rolling through the third finishing hole in the finishing rolling zone; 16) Determine whether the rolled third finishing mill lower hole or the second intermediate mill upper hole meets the rolling requirements; if both meet the rolling requirements, return to step 13). If the rolling requirements are not met, the working intermediate roll is removed and the spare intermediate roll is used as the working roll; at the same time, the upper and lower rolls are exchanged and then the process is returned to step 1) to roll in reverse.

3. The four-roll, two-pass long-life rolling method for a transverse three-roll mill as described in claim 1, characterized in that, The roughing roll holes are three in number: first roughing roll hole > second roughing roll hole > third roughing roll hole.

4. The four-roll, two-pass long-life rolling method for a transverse three-roll mill as described in claim 3, characterized in that, The third roughing pass is a T-shaped pass.

5. The four-roll, two-pass long-life rolling method for a transverse three-roll mill as described in claim 2, characterized in that, Both the first and second intermediate rolling holes are trapezoidal rolling holes.

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