A control method for preventing abnormal wear of finished product grooves

Abstract

The present invention discloses a control method for preventing abnormal wear of a finished rolling groove, which relates to the field of steel rolling technology. The method comprises: using a diamond forming grinding wheel to groove a rolling roller to form a rolling groove, and then using a resin forming grinding wheel to polish the rolling groove; controlling the size of the incoming material to control the ovality of the incoming material to 40% to 50%; calibrating the centering of the guide; adjusting the cooling water outlet pressure of the water-cooling water tank to ensure a uniform surface temperature of the rolled piece; adjusting the rolling line tension coefficient to 1 to 4; and adjusting the size of the rolling groove water cooling nozzle according to the size of the rolling groove to ensure that the rolling groove water cooling nozzle can face the center of the rolling groove. The present invention prevents abnormal wear of the finished rolling groove, reduces the number of times the finished roller needs to be replaced, reduces the time for roller replacement, improves production efficiency, reduces the amount of roller scrapped, saves production costs, and improves the stability of product quality.

Description

Technical Field

[0001] The present invention relates to the technical field of steel rolling, and in particular to a control method for preventing abnormal wear of a finished rolling groove. Background Art

[0002] High-quality steel has high carbon and alloy content, high hardness, and strict requirements for structure and performance. It requires low-temperature rolling during rolling. However, the high hardness during low-temperature rolling has a greater impact on the finished groove, which can easily cause wear of the groove. Improper control can easily cause uneven wear of the groove, resulting in abnormal wear. Abnormal wear of the finished groove can cause abnormalities in product size and surface quality. High-quality steel has relatively high requirements for product size and surface quality. When abnormalities occur, the rollers must be replaced in a timely manner and the abnormal product must be downgraded. Abnormally worn grooves must be scrapped, resulting in reduced production efficiency and cost losses. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a control method for preventing abnormal wear of a finished rolling groove.

[0004] In order to solve the above technical problems, the technical solutions of the present invention are as follows:

[0005] A control method for preventing abnormal wear of a finished product groove, comprising:

[0006] The roller is grooved using a diamond profile grinding wheel to form a groove, and then the groove is polished using a resin profile grinding wheel;

[0007] Control the size of incoming materials and control the ovality of incoming materials to 40%~50%;

[0008] Calibrate the centering of the guide;

[0009] Adjust the cooling water outlet pressure of the water cooling tank to ensure uniform surface temperature of the rolled piece;

[0010] Adjust the rolling line tension coefficient to -1~-4;

[0011] Adjust the size of the rolling groove water cooling nozzle according to the size of the rolling groove to ensure that the rolling groove water cooling nozzle can face the center of the rolling groove.

[0012] As a preferred solution of the control method for preventing abnormal wear of the finished rolling groove of the present invention, the rotation speed of the diamond forming grinding wheel and the resin forming grinding wheel is 1500-1800 rpm.

[0013] As a preferred embodiment of the control method for preventing abnormal wear of the finished groove of the present invention, after grooving the roller to form the groove using a diamond profiled grinding wheel and then grinding the groove using a resin profiled grinding wheel, the method further comprises:

[0014] Polish the grooves using a wooden stick.

[0015] As a preferred solution of the control method for preventing abnormal wear of the finished rolling groove of the present invention, the surface roughness of the polished rolling groove is ≤60um.

[0016] As a preferred solution of the control method for preventing abnormal wear of the finished rolling groove of the present invention, wherein: adjusting the cooling water outlet pressure of the water cooling tank to ensure uniform surface temperature of the rolled piece includes:

[0017] Adjust the cooling water outlet pressure of the water-cooling tank so that the circumferential temperature of the rolled piece is 820℃-860℃ and the surface temperature difference of the rolled piece is less than or equal to 40℃.

[0018] As a preferred solution of the control method for preventing abnormal wear of the finished groove of the present invention, wherein: adjusting the size of the groove water cooling nozzle according to the size of the groove to ensure that the groove water cooling nozzle is directly facing the center of the groove includes:

[0019] When the rolling specification of the groove is φ5.0~9.5, adjust the nozzle angle of the groove water cooling nozzle to 30°;

[0020] When the rolling specification of the groove is φ10~16, adjust the nozzle angle of the groove water cooling nozzle to 45°;

[0021] When the rolling specification of the rolling groove is φ17~22, the nozzle angle of the rolling groove water cooling nozzle is adjusted to 60°.

[0022] The beneficial effects of the present invention are:

[0023] The present invention eliminates abnormal wear of the finished product rolling groove, reduces the number of times the finished product roll is replaced, reduces the time for roll replacement, improves production efficiency, reduces the amount of roll scrapping, saves production costs, and improves the stability of product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0025] Figure 1 A schematic flow chart of a control method for preventing abnormal wear of a finished rolling groove provided by the present invention. DETAILED DESCRIPTION

[0026] In order to make the contents of the present invention more clearly understood, the present invention is further described below in detail based on specific implementation methods in conjunction with the accompanying drawings.

[0027] Figure 1 This is a flow chart of a control method for preventing abnormal wear of a finished rolling groove provided in an embodiment of the present application. The method includes steps S101 to S106, and the specific steps are described as follows:

[0028] Step S101: using a diamond forming grinding wheel to groove a roller to form a groove, and then using a resin forming grinding wheel to grind the groove.

[0029] Specifically, to control the uniform wear of the groove, the groove processing quality needs to be improved. The groove processing, which originally used only diamond profile grinding wheels, has been optimized to a two-step process: first, groove cutting using a diamond profile grinding wheel, and then polishing using a resin profile fine grinding wheel.

[0030] In order to prevent local overheating during grooving processing, which causes the local hardness of the groove to be low and thus causes abnormal wear, the grinding wheel speed needs to be reduced during grooving processing. The grinding wheel speed is reduced from the previous 2200-2500rpm to 1500-1800rpm.

[0031] In addition, after the groove is rolled, it is necessary to use a wooden stick to polish it to reduce the surface roughness so that the surface roughness of the groove is ≤60um.

[0032] Step S102: Control the size of the incoming material and control the ovality of the incoming material to 40%~50%.

[0033] Specifically, to control uniform wear of the rolling groove, the material profile was optimized and the ovality of the material entering the sizing process was reduced from 60%-80% to 40%-50%. The incoming material size and shape must be regularized to ensure uniform deformation during rolling and prevent uneven compression of the rolling groove.

[0034] Step S103: Calibrate the centering of the guide.

[0035] Specifically, in order to control the uniform wear of the rolling groove, it is necessary to improve the centering accuracy of the guide installation. The guide must be centered not only in the left and right directions, but also in the up and down directions. After the operator completes the centering of the guide, the guide can be adjusted using a sample rod to calibrate the alignment. During calibration, the sample rod is required to coincide with the center line of the rolling groove. Sample rods of different specifications can be pre-made, and these sample rods of different specifications have the same dimensions as the rolled products of different specifications. By adjusting the centering of sample rods of different specifications, it can be ensured that the rolled products of different specifications can enter the rolling groove in the center.

[0036] In addition, the guide seat will wear out due to long-term use, so it is necessary to prepare some spare shims to ensure that the rolled piece can enter the rolling groove in the middle during rolling and prevent the rolled piece from locally impacting the rolling groove. To ensure accurate adjustment, the shim thickness is in units of 0.3mm.

[0037] Step S104: adjusting the cooling water outlet pressure of the water-cooling tank to ensure uniform surface temperature of the rolled piece.

[0038] Specifically, to ensure uniform wear of the rolling groove, the surface hardness of the rolled piece must be uniform. To ensure uniform cooling of the rolled piece as it passes through the water cooling box, it is necessary to ensure that the water outlet of the water cooling nozzle is unblocked, the water outlet pressure is evenly distributed, and the cooling water is sprayed in a fan-shaped pattern to ensure uniform cooling of the rolled piece in both the circumferential and longitudinal directions. The surface temperature of the rolled piece must be uniform, and abnormally low temperatures, such as "black lines," must not appear. After the rolled piece exits the water cooling box, a reverse purge device must be installed to remove any residual water from the surface of the rolled piece, ensuring that the rolled piece is fully heated.

[0039] A three-point temperature measuring device uniformly distributed around the entire circumference is installed at the sizing entrance, with a temperature range of 820-860°C, reducing the surface temperature difference of the rolled piece to ≤40°C.

[0040] Step S105: Adjust the rolling line tension coefficient to -1~-4.

[0041] Specifically, in order to ensure uniform wear of the rolling groove, it is necessary to ensure micro-tension rolling, and the tension coefficient is adjusted to -1~-4 to prevent the rolled piece from swinging inside the rolling groove due to the piled steel, causing the rolling groove to "eat steel" unevenly, and the uneven contact between the rolling groove and the steel, causing uneven wear of the rolling groove.

[0042] Step S106: adjusting the size of the rolling groove water cooling nozzle according to the size of the rolling groove to ensure that the rolling groove water cooling nozzle can face the center of the rolling groove.

[0043] Specifically, to ensure uniform wear of the groove, the size of the groove cooling water pipe nozzle is classified according to the size of the groove, ensuring that the water cooling nozzle can be directly aligned with the center of the groove and fully utilize its cooling capacity. The nozzle size is divided into three types: large, medium, and small according to the corresponding groove size. The corresponding usage is shown in Table 1:

[0044] Rolling specifications (mm) Nozzle type (nozzle angle) φ5.0-9.5 Small (30°) φ10-16 Medium (45°) φ17-22 Large (60°)

[0045] Table 1

[0046] Referring to Table 1, when the rolling specification of the groove is φ5.0~9.5, the nozzle angle of the groove water cooling nozzle is adjusted to 30°; when the rolling specification of the groove is φ10~16, the nozzle angle of the groove water cooling nozzle is adjusted to 45°; when the rolling specification of the groove is φ17~22, the nozzle angle of the groove water cooling nozzle is adjusted to 60°.

[0047] Take the production of medium-sized φ14mm54SiCr6 as an example:

[0048] 54SiCr6 is a German standard spring steel grade primarily used in automotive suspension springs and other key components. Nanjing Steel uses this grade of spring steel to produce 2000 MPa springs for joint venture vehicle brands. Its chemical composition is: C: 0.52%-0.56%, Si: 1.40%-1.60%, Mn: 0.60%-0.80%, Cr: 0.60%-0.80%, belonging to the medium-carbon, high-alloy steel family.

[0049] By adopting the above control method, this batch of 54SiCr6 was produced with a groove production of 650 tons. The size has always maintained the highest grade "C" product precision of the national standard, with good surface quality and no "roller marks". The grooves of the replaced rollers were inspected and the grooves were evenly worn without local excessive wear, which greatly improved production efficiency and reduced the cost losses caused by roller replacement.

[0050] Therefore, the technical solution of the present application eliminates abnormal wear of the finished rolling groove, reduces the number of times the finished rolls are replaced, reduces the time for roll replacement, improves production efficiency, reduces the amount of roll scrapping, saves production costs, and improves the stability of product quality.

[0051] In addition to the above embodiments, the present invention may also have other implementation methods; any technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention.

Claims

1. A control method for preventing abnormal wear of a finished rolling groove, characterized in that: include: The roller is grooved using a diamond forming grinding wheel to form a groove, and then the groove is polished using a resin forming grinding wheel and polished using a wooden stick to make the surface roughness of the polished groove ≤ 60 μm; Control the size of incoming materials and control the ovality of incoming materials to 40%~50%; Calibrate the centering of the guide; Adjust the cooling water outlet pressure of the water cooling tank to ensure uniform surface temperature of the rolled piece; Adjust the rolling line tension coefficient to -1~-4; Adjust the size of the rolling groove water cooling nozzle according to the size of the rolling groove, and ensure that the rolling groove water cooling nozzle is facing the center of the rolling groove; The step of adjusting the size of the rolling groove water cooling nozzle according to the size of the rolling groove to ensure that the rolling groove water cooling nozzle can face the center of the rolling groove includes: When the rolling specification of the groove is φ5.0~9.5, adjust the nozzle angle of the groove water cooling nozzle to 30°; When the rolling specification of the groove is φ10~16, adjust the nozzle angle of the groove water cooling nozzle to 45°; When the rolling specification of the rolling groove is φ17~22, the nozzle angle of the rolling groove water cooling nozzle is adjusted to 60°.

2. The control method for preventing abnormal wear of the finished rolling groove according to claim 1, characterized in that: The rotation speed of the diamond forming grinding wheel and the resin forming grinding wheel is 1500-1800rpm.

3. The control method for preventing abnormal wear of the finished rolling groove according to claim 1, characterized in that: The adjusting of the cooling water outlet pressure of the water cooling tank to ensure uniform surface temperature of the rolled piece includes: Adjust the cooling water outlet pressure of the water-cooling tank so that the circumferential temperature of the rolled piece is 820℃-860℃ and the surface temperature difference of the rolled piece is less than or equal to 40℃.

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