Roller wear amount and opening degree detection method for a piercer and a detection device therefor

Abstract

The present application relates to a kind of roll wear and opening detection method and its detection device of cross piercer, it includes the following steps, step one: using detection device to obtain detection feature point coordinates;Step two: establish the relationship between cross piercer space coordinate system and world coordinate system, determine roll section equation group;Step three: calculate roll box rigid offset;Step four: determine the wear of upper roll and the wear of lower roll;Step five: determine roll opening degree.The present application establishes the surface equation of roll, projection equation and section equation, and calculates the wear data of roll;It can realize the on-line detection of roll wear and opening, detection method is simple, convenient, improve the roll gap setting precision of cross piercer and the precision of blank forming.The device of the present application is aimed at the wear problem of roll caused by physical and chemical factors during the piercing process of cross piercer, provides a kind of roll wear and opening detection device with reasonable structure design, easy installation and accurate measurement.

Description

Technical Field

[0001] This application relates to the field of roll wear detection, specifically to a method and device for detecting roll wear and opening degree in a skew rolling mill. Background Technology

[0002] Rolls are the most important working components in skew rolling mills. Throughout the rolling process, rolls operate under continuous high pressure, high temperature, and high speed conditions in a very harsh environment. In addition, they are in direct contact with iron oxide scale and cooling water, and are subject to drastic temperature fluctuations, making them prone to thermal fatigue. This accelerates roll wear and can even lead to abnormal failures such as surface spalling, reducing roll lifespan. The quality and lifespan of rolls directly affect the mill's productivity, product quality, and production costs. As a large consumable component of the mill, roll replacement costs are high. Therefore, improving roll lifespan has become an important direction for reducing production costs.

[0003] During the piercing process of steel pipes, roll wear is mainly concentrated in the forming section that is in direct contact with the pipe body. Roll wear not only increases roll consumption but also alters the original roll profile, causing changes in the roll gap. This, in turn, affects the pipe wall thickness and surface morphology, reduces the accuracy of tube forming and the yield, and severely restricts the improvement of product quality. In actual production, due to the lack of effective roll wear detection devices, the roll wear process cannot be monitored and tracked in a timely and accurate manner. This leads to abnormal deviations in the die profile caused by roll wear, resulting in decreased piercing accuracy and even quality defects such as misalignment, uneven tube wall thickness, and surface scratches. Due to mill vibration and rolling force impact, the roll box of the installed roll system can also experience overall displacement, causing changes in the opening degree, with the actual opening degree inconsistent with the set opening degree. With the development of intelligent seamless steel pipe production and high-end products, there is an urgent need to develop roll wear and opening degree detection devices to change the current situation where roll gap setting and roll change cycle rely entirely on manual experience. Accurate and efficient measurement methods are the prerequisite for improving the control level of skew rolling mills, improving product quality and increasing production efficiency. Precise measurement methods can obtain accurate wear status of the rolls, allowing for timely adjustments to the rolling process, reducing scrap generation. Furthermore, higher measurement accuracy ensures better surface quality of the rolled steel, while also significantly increasing output, enabling free-program rolling, and extending roll change cycles. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention utilizes a detection device to achieve online detection of roll coordinate data. Based on theoretical analysis, it establishes the surface equation, projection equation, and cross-sectional equation of the roll for further analysis, eliminating interference caused by roll misalignment and accurately calculating detailed roll wear data and roll opening values. This provides precise actual roll profile feedback for roll gap setting, thereby improving the control level and forming accuracy of seamless steel pipe piercing process, and enhancing product quality and yield.

[0005] To achieve the above objectives, the solution adopted by the present invention is as follows:

[0006] A method for detecting the wear and opening degree of rolls in a skew rolling mill includes the following steps:

[0007] Step 1: Use a detection device to obtain the coordinates of the detection feature points;

[0008] The laser sensor of the detection device emits a laser beam that is projected onto the rolls of the seamless steel pipe skew rolling piercing mill. The beam is reflected back to the receiver in the sensor, which reads and analyzes the data to obtain the detection feature points P1 and P2 at the irradiated position of the rolls. The coordinates of the detection feature point P1 on the upper roll are read as follows: The coordinates of feature point P2 detected by the lower roller are:

[0009] Step 2: Establish the relationship between the skew rolling space coordinate system and the world coordinate system, and determine the roll section equations;

[0010] Step 21: Establish the coordinate transformation relationship between the skew rolling space coordinate system OXYZ and the world coordinate system oxyz;

[0011] The skew rolling space coordinate system OXYZ is obtained by translating the world coordinate system oxyz along the oy direction by a distance p, then rotating it counterclockwise around the oy axis by an angle α, and then rotating it counterclockwise around the oz axis by an angle β. The transformation relationship between the skew rolling space coordinate system OXYZ and the world coordinate system oxyz is shown in the following equation:

[0012]

[0013] In the formula: X, Y, and Z represent the abscissa, ordinate, and vertical coordinates of the skew rolling space coordinate system, respectively; x, y, and z represent the abscissa, ordinate, and vertical coordinates of the world coordinate system, respectively; p represents the translation distance of the roll; α represents the feed angle of the roll; β represents the rolling angle of the roll;

[0014] Step 22: Establish the surface equation of the upper roll under the skew rolling spatial coordinate system OXYZ, and further determine the roll cross-section equation;

[0015] In the skew rolling space coordinate system OXYZ, the roll is divided into the inlet cone AB section, the leveling BC section, and the exit cone CD section according to the structural characteristics of the roll. The surface equations of the roll for the inlet cone AB section, the leveling BC section, and the exit cone CD section are determined respectively, as shown in the following formula:

[0016]

[0017] In the formula: n represents the x-coordinate value of point B; γ1 represents the angle between the inlet cone AB segment and the X-axis; γ2 represents the angle between the leveling BC segment and the X-axis; r represents the roll radius at the YOZ section; m represents the x-coordinate value of point C; γ3 represents the angle between the outlet cone CD segment and the X-axis.

[0018] Substituting the coordinate transformation relationship determined in step 21 into the roll surface equation in the skew rolling space coordinate system OXYZ, we obtain the roll surface equation in the world coordinate system oxyz, the general form of which is shown below:

[0019] A0x 2 +B0y 2 +G0z 2 +C0xy+H0yz+I0xz+D0x+E0y+J0z+F0=0;

[0020] In the formula: A0, B0, C0, D0, E0, F0, G0, H0, I0 and J0 represent the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth and tenth coefficients of the roll surface equation, respectively;

[0021] Setting z = 0, the general formula for the roll cross-section intercepted by the displacement sensor is as follows:

[0022] A0x 2 +B0y 2 +C0xy+D0x+E0y+F0=0;

[0023] Step 23: Obtain the feed angle α and rolling angle β, calculate the upper roll projection equations, and determine the upper roll cross-section equations;

[0024] Substituting γ1 and γ2 into the equation set for solving the upper roll projection equation, we obtain the coefficients A1, B1, C1, D1, E1, and F1 of the upper roll projection equation for the inlet cone AB section; substituting γ2 into the equation set for solving the upper roll projection equation, we obtain the coefficients A2, B2, C2, D2, E2, and F2 of the upper roll projection equation for the leveling BC section; substituting γ2 and γ3 into the equation set for solving the upper roll projection equation, we obtain the coefficients A3, B3, C3, D3, E3, and F3 of the upper roll projection equation for the outlet cone CD section.

[0025] Substitute the coefficients of the projection equations for the upper rolls in the inlet cone AB section, the leveling section BC section, and the outlet cone CD section into the general formula for the upper roll cross-section equation in step 22, and rearrange to determine the upper roll cross-section equation set as shown in the following equation:

[0026]

[0027] In the formula: A1, B1, C1, D1, E1, and F1 represent the first, second, third, fourth, fifth, and sixth coefficients of the inlet cone AB section roll cross-section equation; A2, B2, C2, D2, E2, and F2 represent the first, second, third, fourth, fifth, and sixth coefficients of the leveling BC section roll cross-section equation; A3, B3, C3, D3, E3, and F3 represent the first, second, third, fourth, fifth, and sixth coefficients of the outlet cone CD section roll cross-section equation.

[0028] By adjusting the feed angle and rolling angle in step 2 to -α and -β, and repeating step 2, the equation set of the lower roll section can be determined.

[0029] Step 3: Determine the roll box offset;

[0030] The initial distance d0 between the inner surface of the frame and the roll box is detected using a laser rangefinder. After a period of operation, the detected distance becomes d1. The method for obtaining the offset s of the roll box is shown in the following formula:

[0031] s = d1 - d0;

[0032] In the formula: s represents the offset of the roll box; d1 represents the detection distance after use; d0 represents the initial detection distance;

[0033] Step 4: Determine the wear amount of the upper roller and the lower roller;

[0034] The x-coordinate of the feature point determined in step 1 is... i Substituting the equations for the upper and lower roll sections determined in step 23, the results obtained are as follows: The method for obtaining the wear amount of the upper and lower rolls is shown in the following formula:

[0035]

[0036] In the formula: Δy u Indicates the wear of the upper roller of the rolling mill; Δy d This indicates the amount of wear on the lower roller of the rolling mill; Represents the ordinate of the feature point on the upper roller; Represents the ordinate of the feature point of the lower roller; Indicates the coordinates of the upper roller feature point after wear; Indicates the coordinates of the lower roller feature point after wear;

[0037] Step 5: Determine the roll opening degree;

[0038] The method for obtaining the roll opening degree k is shown in the following formula:

[0039]

[0040] In the formula: k represents the roll opening degree.

[0041] Preferably, in step 23, γ1 and γ2 are substituted into the equation set for solving the upper roll projection equation to obtain the coefficients A1, B1, C1, D1, E1, and F1 of the upper roll projection equation for the AB segment of the inlet cone, specifically:

[0042] The methods for obtaining the coefficients A1, B1, C1, D1, E1, and F1 of the projection equation of the roll on the AB segment of the inlet cone are as follows:

[0043] A1 = cos 2 α·sin 2 β+sin 2 α-cos 2 α·cos 2 β·tan 2 γ1;

[0044] B1 = cos 2 β-sin 2 β·tan 2 γ1;

[0045] C1=-2cosα·sinβ·cosβ-2cosα·sinβ·cosβ·tan 2 γ1;

[0046] D1=-2p cosα·sinβ·cosβ-2p cosα·sinβ·cosβ·tan 2 γ1+2n cosα·cosβ·tan 2 γ1-2r cosα·cosβ·tanγ1-2n cosα·cosβ·tanγ1·tanγ2;

[0047] E1 = 2pcos 2 β-2psin 2 β·tan 2 γ1+2n sinβ·tan 2 γ1-2r sinβ·tanγ1-2n sinβ·tanγ1·tanγ2;

[0048] F1 = p 2 cos 2 β-p 2 sin2 β·tan 2 γ1+2np sinβ·tan 2 γ1-n 2 tan 2 γ1-2rpsinβ·tanγ1-2npsinβ·tanγ1·tanγ2+2rntanγ1+2n 2 tanγ1·tanγ2-r 2 -2rntanγ2-n 2 tan 2 γ2.

[0049] Preferably, in step 23, γ2 is substituted into the equation set for solving the upper roll projection equation to obtain the coefficients A2, B2, C2, D2, E2, and F2 of the upper roll projection equation for the BC segment, specifically:

[0050] The methods for obtaining the coefficients A2, B2, C2, D2, E2, and F2 of the projection equation of the rolls on the BC section of the leveling mill are as follows:

[0051] A2 = cos 2 α·sin 2 β+sin 2 α-cos 2 α·cos 2 β·tan 2 γ2;

[0052] B2 = cos 2 β-sin 2 β·tan 2 γ2;

[0053] C2=-2cosα·sinβ·cosβ-2cosα·sinβ·cosβ·tan 2 γ2;

[0054] D2=-2p cosα·sinβ·cosβ-2p cosα·sinβ·cosβ·tan 2 γ2-2r cosα·cosβ·tanγ2;

[0055] E2 = 2pcos 2 β-2psin 2 β·tan 2 γ² - 2r sinβ·tanγ²;

[0056] F2 = p 2 cos 2 β-p 2 sin 2 β·tan2 γ2-2rp sinβ·tanγ2-r 2 .

[0057] Preferably, in step 23, γ2 and γ3 are substituted into the equation set for solving the upper roll projection equation to obtain the coefficients A3, B3, C3, D3, E3, and F3 of the upper roll projection equation for the exit cone CD section, specifically:

[0058] The methods for obtaining the coefficients A3, B3, C3, D3, E3, and F3 of the projection equation of the rolls on the CD section of the outlet cone are as follows:

[0059] A3 = cos 2 α·sin 2 β+sin 2 α-cos 2 α·cos 2 β·tan 2 γ3;

[0060] B3 = cos 2 β-sin 2 β·tan 2 γ3;

[0061] C3=-2cosα·sinβ·cosβ-2cosα·sinβ·cosβ·tan 2 γ3;

[0062] D3=-2pcosα·sinβ·cosβ-2p cosα·sinβ·cosβ·tan 2 γ3+2m cosα·cosβ·tan 2 γ3-2r cosα·cosβ·tanγ3-2m cosα·cosβ·tanγ2·tanγ3;

[0063] E3 = 2pcos 2 β-2psin 2 β·tan 2 γ3+2m sinβ·tan 2 γ3-2r sinβ·tanγ3-2m sinβ·tanγ2·tanγ3;

[0064] F3 = p 2 cos 2 β-p 2 sin 2 β·tan 2 γ3+2mp sinβ·tan 2 γ3-m 2 tan 2γ3-2rp sinβ·tanγ3-2mp sinβ·tanγ2·tanγ3+2rm tanγ3+2m 2 tanγ2·tanγ3-r 2 -2rm tanγ2-m 2 tan 2 γ2.

[0065] A second aspect of the present invention provides a device for detecting roll wear and opening degree in a seamless steel pipe skew rolling piercing mill, which includes a laser rangefinder, an offset detection device, a core-setting device, and a movable device.

[0066] The laser ranging device includes a first laser ranging sensor, a cooling water jacket, heat insulation material, a purging device, a transparent dustproof layer, and a housing. The first laser ranging sensor is placed in the cooling water jacket, which is filled with circulating cooling water to reduce the temperature of the laser ranging sensor. The first laser ranging sensor is fixedly connected to the cooling water jacket, and a reinforcing gasket is provided between the first laser ranging sensor and the cooling water jacket. The purging device is located around the heat insulation device and fixed to the housing. The heat insulation device includes heat insulation material wrapped around the outside of the cooling water jacket. The transparent dustproof layer is embedded in the housing and is coplanar with the laser emitting side of the first laser ranging sensor. The purging port is attached to the purging device.

[0067] The offset detection device includes a second laser ranging sensor, which is installed on the inner side of the frame at the gap between the roll box and the frame. The second laser ranging sensor is used to monitor the overall offset of the roll box.

[0068] The core-fixing device includes a core-holding device, which is used to fix the position of the laser rangefinder and ensure that its centerline coincides with the rolling axis.

[0069] The movable device includes a transport trolley and a guide rail, and the transport trolley can push the laser rangefinder to move forward at a constant speed on the guide rail.

[0070] Preferably, both the laser ranging device and the offset detection device are provided in two sets. The laser ranging device is installed on the upper and lower sides of the housing, respectively, and the offset detection device is installed in the gap between the upper and lower roll boxes and the inner side of the frame, thereby realizing the simultaneous measurement of the upper and lower rolls.

[0071] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0072] (1) This invention obtains the roll coordinate parameters by using laser emitted by a sensor. By establishing the surface equation, projection equation and cross-sectional equation of the roll, the interference caused by the roll box offset is eliminated, and the roll wear data is further analyzed and calculated. This invention can realize online detection of roll wear and opening degree. The detection method is simple and convenient, which can improve the control level and forming accuracy of seamless steel pipe piercing process, and can greatly improve product quality and yield.

[0073] (2) The device of the present invention provides a simple, easy-to-install and accurate roll wear and opening degree detection device for the roll wear problem caused by the cyclic thermo-mechanical contact fatigue load, as well as environmental and physicochemical factors during the piercing process of the skew rolling mill. Attached Figure Description

[0074] Figure 1 This is a schematic flowchart of the method for detecting the wear and opening degree of the rolls in a skew rolling mill according to an embodiment of the present invention;

[0075] Figure 2 This is a diagram showing the positional relationship of the coordinate system in an embodiment of the present invention;

[0076] Figure 3 The coordinate system for the roll surface equation in this embodiment of the invention;

[0077] Figure 4 This is a cross-sectional view of the measuring device according to an embodiment of the present invention;

[0078] Figure 5 This is a view of the outer casing from direction A according to an embodiment of the present invention;

[0079] Figure 6 This is a schematic diagram of the working operation of the skew rolling mill wear and opening degree detection device according to an embodiment of the present invention;

[0080] The following are descriptions of some of the attached figures:

[0081] 1. First laser rangefinder sensor; 2. Cooling water jacket; 3. Thermal insulation material; 4. Blowing device; 5. Nut; 6. Bolt; 7. Washer; 8. Transparent dustproof layer; 9. Blowing port; 10. Housing; 11. Second laser rangefinder sensor; 12. Frame; 13. Roll box; 14. Upper roll; 15. Transport trolley; 16. Guide rail; 17. Core clamping device; 18. Lower roll. Detailed Implementation

[0082] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0083] This invention provides a detailed description of online detection of roll coordinate data using a detection device. Based on theoretically established surface, projection, and cross-sectional equations of the roll, further analysis is conducted, and detailed data on roll wear and opening degree are accurately calculated. This detection method is simple and convenient to operate, providing accurate actual roll profile feedback for roll gap setting, thereby improving the control level of seamless steel pipe piercing process, reducing defects such as piercing deviation, uneven wall thickness, and surface scratches, and improving product quality and yield. Figure 1 This is a flowchart illustrating the method for detecting roll wear and opening degree in a skew rolling mill according to an embodiment of the present invention. The detection device is simple in structure, easy to install, and provides accurate measurements. Figure 4 The figure shown is a cross-sectional view of the measuring device according to an embodiment of the present invention, illustrating the basic structure of the device.

[0084] This invention provides a method for detecting the wear and opening degree of rolls in a skew rolling mill. To demonstrate the applicability of this invention, it is applied to an example, specifically including the following steps:

[0085] S1: Use a detection device to obtain the coordinates of the detection feature points;

[0086] The first laser rangefinder 1 of the detection device emits a laser beam that is projected onto the rolls of the seamless steel pipe skew rolling mill. The beam is reflected back to the receiver in the sensor, which reads and analyzes the data to obtain the detection feature points P1 and P2 at the roll irradiation position. The coordinates of the upper roll detection feature point P1 are read as follows: The coordinates of feature point P2 detected by the lower roller are:

[0087] S2: Establish the relationship between the skew rolling space coordinate system and the world coordinate system, and determine the roll section equations;

[0088] S21: Establish the coordinate transformation relationship between the skew rolling space coordinate system OXYZ and the world coordinate system oxyz;

[0089] The skew rolling space coordinate system OXYZ is obtained by translating the world coordinate system oxyz by a distance p along the oy direction, then rotating it counterclockwise by an angle α around the oy axis, and then rotating it counterclockwise by an angle β around the oz axis. The transformation relationship between the skew rolling space coordinate system OXYZ and the world coordinate system oxyz is shown in the following formula:

[0090]

[0091] In the formula: X, Y and Z represent the horizontal, vertical and horizontal coordinates of the skew rolling space coordinate system, respectively; x, y and z represent the horizontal, vertical and horizontal coordinates of the world coordinate system, respectively; p represents the translation distance of the roll; α represents the feed angle of the roll; β represents the rolling angle of the roll.

[0092] like Figure 2 The diagram shows the coordinate system position relationship of an embodiment of the present invention; in the diagram, OXYZ is the skew rolling space coordinate system and oxyz is the world coordinate system; the skew rolling space coordinate system OXYZ can be obtained by translating the world coordinate system oxyz along the oy direction by a distance p, rotating it counterclockwise around the oy axis by an angle α, and then rotating it counterclockwise around the oz axis by an angle β.

[0093] S22: Establish the surface equation of the upper roll under the skew rolling spatial coordinate system OXYZ, and further determine the roll cross-section equation;

[0094] In the skew rolling space coordinate system OXYZ, the roll is divided into the inlet cone AB section, the leveling section BC section, and the exit cone CD section according to the roll's structural characteristics. The roll surface equations for the inlet cone AB section, the leveling section BC section, and the exit cone CD section are determined respectively, as shown in the following equations:

[0095]

[0096] In the formula: n represents the x-coordinate value of point B; γ1 represents the angle between the inlet cone AB segment and the X-axis; γ2 represents the angle between the leveling BC segment and the X-axis; r represents the roll radius at the YOZ section; m represents the x-coordinate value of point C; γ3 represents the angle between the outlet cone CD segment and the X-axis.

[0097] like Figure 3 The figure shown is an XOY coordinate plane diagram in the OXYZ spatial coordinate system of the skew rolling mill according to an embodiment of the present invention. This coordinate plane facilitates the derivation of the roll surface equation.

[0098] Substituting the coordinate transformation relationship determined by S21 into the roll surface equation in the skew rolling space coordinate system OXYZ, we obtain the roll surface equation in the world coordinate system oxyz, the general form of which is shown below:

[0099] A0x 2 +B0y 2 +G0z 2 +C0xy+H0yz+I0xz+D0x+E0y+J0z+F0=0;

[0100] In the formula: A0, B0, C0, D0, E0, F0, G0, H0, I0 and J0 represent the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth and tenth coefficients of the roll surface equation;

[0101] Setting z = 0, the general formula for the roll cross-section intercepted by the displacement sensor is as follows:

[0102] A0x 2 +B0y 2 +C0xy+D0x+E0y+F0=0;

[0103] S23: Obtain the feed angle and rolling angle α and β, calculate the upper roll projection equation set, and determine the upper roll section equation set;

[0104] Substitute γ1 and γ2 into the equation system for solving the upper roll projection equation to obtain the coefficients A1, B1, C1, D1, E1, and F1 of the upper roll projection equation for the AB segment of the inlet cone. The method for obtaining the coefficients A1, B1, C1, D1, E1, and F1 of the upper roll projection equation for the AB segment of the inlet cone is as follows:

[0105] A1 = cos 2 α·sin 2 β+sin 2 α-cos 2 α·cos 2 β·tan 2 γ1;

[0106] B1 = cos 2 β-sin 2 β·tan 2 γ1;

[0107] C1=-2cosα·sinβ·cosβ-2cosα·sinβ·cosβ·tan 2 γ1;

[0108] D1=-2p cosα·sinβ·cosβ-2p cosα·sinβ·cosβ·tan 2 γ1+2n cosα·cosβ·tan 2 γ1-2r cosα·cosβ·tanγ1-2n cosα·cosβ·tanγ1·tanγ2;

[0109] E1 = 2pcos 2 β-2psin 2 β·tan 2 γ1+2n sinβ·tan 2 γ1-2r sinβ·tanγ1-2n sinβ·tanγ1·tanγ2;

[0110] F1 = p 2 cos 2 β-p 2 sin 2 β·tan 2 γ1+2np sinβ·tan 2 γ1-n 2 tan 2γ1-2rp sinβ·tanγ1-2np sinβ·tanγ1·tanγ2+2rn tanγ1+2n 2 tanγ1·tanγ2-r 2 -2rn tanγ2-n 2 tan 2 γ2.

[0111] Substitute γ2 into the coefficients of the upper roll projection equation and solve the system of equations to obtain the coefficients A2, B2, C2, D2, E2, and F2 of the upper roll projection equation for the BC section of the leveling mill. The method for obtaining the coefficients A2, B2, C2, D2, E2, and F2 of the upper roll projection equation for the BC section of the leveling mill is as follows:

[0112] A2 = cos 2 α·sin 2 β+sin 2 α-cos 2 α·cos 2 β·tan 2 γ2;

[0113] B2 = cos 2 β-sin 2 β·tan 2 γ2;

[0114] C2=-2cosα·sinβ·cosβ-2cosα·sinβ·cosβ·tan 2 γ2;

[0115] D2=-2p cosα·sinβ·cosβ-2p cosα·sinβ·cosβ·tan 2 γ2-2r cosα·cosβ·tanγ2;

[0116] E2 = 2pcos 2 β-2psin 2 β·tan 2 γ2-2rsinβ·tanγ2;

[0117] F2 = p 2 cos 2 β-p 2 sin 2 β·tan 2 γ2-2rpsinβ·tanγ2-r 2 .

[0118] Substitute γ2 and γ3 into the equation system for solving the upper roll projection equation to obtain the coefficients A3, B3, C3, D3, E3, and F3 of the upper roll projection equation for the exit cone CD section. The method for obtaining the coefficients A3, B3, C3, D3, E3, and F3 of the upper roll projection equation for the exit cone CD section is as follows:

[0119] A3 = cos 2 α·sin 2 β+sin 2 α-cos 2 α·cos 2 β·tan 2 γ3;

[0120] B3 = cos 2 β-sin 2 β·tan 2 γ3;

[0121] C3=-2cosα·sinβ·cosβ-2cosα·sinβ·cosβ·tan 2 γ3;

[0122] D3=-2p cosα·sinβ·cosβ-2p cosα·sinβ·cosβ·tan 2 γ3+2m cosα·cosβ·tan 2 γ3-2rcosα·cosβ·tanγ3-2m cosα·cosβ·tanγ2·tanγ3;

[0123] E3 = 2pcos 2 β-2psin 2 β·tan 2 γ3+2m sinβ·tan 2 γ3-2r sinβ·tanγ3-2m sinβ·tanγ2·tanγ3;

[0124] F3 = p 2 cos 2 β-p 2 sin 2 β·tan 2 γ3+2mp sinβ·tan 2 γ3-m 2 tan 2 γ3-2rpsinβ·tanγ3-2mp sinβ·tanγ2·tanγ3+2rm tanγ3+2m 2 tanγ2·tanγ3-r 2 -2rm tanγ2-m 2tan 2 γ2.

[0125] Substituting the coefficients of the projection equations for the upper rolls in sections AB, BC, and the exit cone CD into the general formula for the upper roll section 14 in S2.2, the equation set for the upper roll section is determined as follows:

[0126]

[0127] In the formula: A1, B1, C1, D1, E1, and F1 represent the first, second, third, fourth, fifth, and sixth coefficients of the inlet cone AB section roll cross-section equation; A2, B2, C2, D2, E2, and F2 represent the first, second, third, fourth, fifth, and sixth coefficients of the leveling BC section roll cross-section equation; A3, B3, C3, D3, E3, and F3 represent the first, second, third, fourth, fifth, and sixth coefficients of the outlet cone CD section roll cross-section equation.

[0128] Adjust the feed angle and rolling angle in S2 to -α and -β; repeating S2 can determine the equation set of the lower roll section;

[0129] S3: Determine the offset of the roll box;

[0130] The second laser rangefinder 11 is used to detect the inner surface of the frame. The initial distance between the rangefinder and the roll box is d0. After a period of operation, the detection distance becomes d1. The offset s of the roll box is calculated as follows:

[0131] s = d1 - d0;

[0132] In the formula: s represents the offset of the roll box; d1 represents the detection distance after use; d0 represents the initial detection distance.

[0133] A positive value indicates that the upper roll moves downward, and a negative value indicates that the upper roll moves upward; the lower roll moves in the opposite direction. The d0 values ​​of the upper and lower rolls are different and need to be measured separately.

[0134] S4: Determine the wear amount of the upper roll and the wear amount of the lower roll;

[0135] The x-coordinate of the feature point determined in S1 i Substituting the equations for the upper and lower roll sections determined by S23, the results obtained are as follows: The method for obtaining the wear amount of the upper and lower rolls is shown in the following formula:

[0136]

[0137] In the formula: Δy u Indicates the wear of the upper roller of the rolling mill; Δy d This indicates the amount of wear on the lower roller of the rolling mill; Represents the ordinate of the feature point on the upper roller; Represents the ordinate of the feature point of the lower roller; Indicates the coordinates of the upper roller feature point after wear; This indicates the coordinates of the lower roller feature point after wear.

[0138] S5: Determine the roll opening degree;

[0139] The formula for calculating the aperture degree k is as follows:

[0140]

[0141] In the formula: k represents the roll opening degree.

[0142] A second aspect of the invention provides a device for detecting roll wear and opening degree in a skew rolling mill for seamless steel pipes, capable of moving within the rolls of the skew rolling mill and performing measurements, such as... Figure 4 The figure shown is a cross-sectional view of the measuring device according to an embodiment of the present invention; as shown Figure 5 The image shown is a view of the outer casing from direction A according to an embodiment of the present invention.

[0143] The detection device includes a laser rangefinder, an offset detection device, a centering device, and a movable device;

[0144] The laser ranging device includes a first laser ranging sensor 1, a cooling water jacket 2, a heat insulation material 3, a purging device 4, a transparent dustproof layer 8, and a housing 10. The laser ranging sensor 1 is placed inside the cooling water jacket 2, which is filled with circulating cooling water to reduce the temperature of the laser ranging sensor. The laser ranging sensor 1 and the cooling water jacket 2 are fixedly connected by bolts 6 and nuts 5. A reinforcing gasket 7 is placed between the laser ranging sensor 1 and the cooling water jacket 2. The purging device 4 is located around the heat insulation material 3 and fixed to the housing 10. The heat insulation material 3 wraps around the outside of the cooling water jacket 2. The transparent dustproof layer 8 is embedded in the housing 10 and is coplanar with the laser emitting side of the laser ranging sensor 1, protecting the lens of the laser ranging sensor from external interference during operation. The purging port 9 is fitted with the purging device 4 to achieve unobstructed and precise smoke purging. The laser ranging sensor 11 is mounted on the frame 12 to measure the offset distance of the rolls.

[0145] The offset detection device includes a second laser rangefinder 11, which is installed on the inner side of the frame and in the gap between the roll box. The second laser rangefinder 11 is used to monitor the overall offset of the roll box.

[0146] The core-fixing device includes a core-holding device 17, which can fix the position of the laser rangefinder and ensure that the center line of the laser rangefinder coincides with the rolling axis.

[0147] The movable device includes a transport trolley 15 and a guide rail 16. The transport trolley 15 can push the laser rangefinder to move forward at a constant speed on the guide rail 16.

[0148] Two sets of laser rangefinders and offset detection devices are provided; the two sets of laser rangefinders and offset detection devices are respectively installed on the upper and lower sides of the housing 10, and the offset detection devices are respectively installed on the inner side of the frame 12 and the gap of the roll box 13, so as to realize the simultaneous measurement of the upper roll 14 and the lower roll 18.

[0149] Figure 6 This is a schematic diagram of the operation of the wear and opening degree detection device for a skew rolling mill according to an embodiment of the present invention. In the diagram, the two first laser rangefinders 1 in the detection device can simultaneously measure two points P on the upper roll 14 and the lower roll 18 at a certain moment. i and P j The values ​​of the two first laser rangefinders 1, i.e., point P i and P j The ordinate.

[0150] In summary, the application results of the method and device for detecting roll wear and opening degree in the skew rolling mill in this case demonstrate its excellent effectiveness.

[0151] (1) In this embodiment of the invention, the coordinate parameters of the roll are obtained by the laser emitted by the sensor. The roll wear data and opening value are further analyzed and calculated by establishing the surface equation, projection equation and cross section equation of the roll. The comparison of the data in the embodiment and the analysis of the attached figures prove that the present invention can realize the online detection of roll wear and opening. The detection method is simple and convenient, which can improve the utilization rate of materials and increase production efficiency.

[0152] (2) The detection device of the present invention is mainly aimed at the problem of severe roll wear and change of opening degree caused by the interference of environmental and physical and chemical factors during the piercing process of the skew rolling mill. Through the introduction and analysis of the structure of the detection device of the present invention, it is proven that the device is a roll wear and opening degree detection device with reasonable structure, convenient installation and accurate measurement.

[0153] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for detecting the wear and opening degree of rolls in a skew rolling mill, characterized in that, It includes the following steps: Step 1: Use a detection device to obtain the coordinates of the detection feature points; The first laser rangefinder in the detection device emits a laser beam that is projected onto the rolls of the seamless steel pipe skew rolling mill. The beam is reflected back to the receiver in the sensor, which reads and analyzes the data; the detection feature points P1 and P2 at the roll irradiation position are obtained, and the coordinates of the upper roll detection feature point P1 are read as ( The coordinates of feature point P2 of the lower roller detection are ( ); Step 2: Establish the relationship between the skew rolling space coordinate system and the world coordinate system, and determine the roll section equations; Step 21: Establish the coordinate transformation relationship between the skew rolling space coordinate system OXYZ and the world coordinate system oxyz; The skew rolling space coordinate system OXYZ is obtained by translating the world coordinate system oxyz along the oy direction by a distance p, then rotating it counterclockwise around the oy axis by an angle α, and then rotating it counterclockwise around the oz axis by an angle β. The transformation relationship between the skew rolling space coordinate system OXYZ and the world coordinate system oxyz is shown in the following equation: ； In the formula: X, Y, and Z represent the abscissa, ordinate, and vertical coordinates of the skew rolling space coordinate system, respectively; x, y, and z represent the abscissa, ordinate, and vertical coordinates of the world coordinate system, respectively; p represents the translation distance of the roll; α represents the feed angle of the roll; β represents the rolling angle of the roll; Step 22: Establish the surface equation of the upper roll under the skew rolling spatial coordinate system OXYZ, and further determine the roll cross-section equation; In the skew rolling space coordinate system OXYZ, the roll is divided into the inlet cone AB section, the leveling BC section, and the exit cone CD section according to the structural characteristics of the roll. The surface equations of the roll for the inlet cone AB section, the leveling BC section, and the exit cone CD section are determined respectively, as shown in the following formula: ； In the formula: n represents the x-coordinate value of point B; γ1 represents the angle between the inlet cone AB segment and the X-axis; γ2 represents the angle between the leveling BC segment and the X-axis; r represents the roll radius at the YOZ section; m represents the x-coordinate value of point C; γ3 represents the angle between the outlet cone CD segment and the X-axis. Substituting the coordinate transformation relationship determined in step 21 into the roll surface equation in the skew rolling space coordinate system OXYZ, we obtain the roll surface equation in the world coordinate system oxyz, the general form of which is shown below: ； In the formula: A0, B0, C0, D0, E0, F0, G0, H0, I0 and J0 represent the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth and tenth coefficients of the roll surface equation, respectively; Setting z=0, the general formula for the roll cross-section intercepted by the displacement sensor is as follows: ； Step 23: Obtain the feed angle and rolling angle Calculate the projection equations of the upper roll and determine the cross-sectional equations of the upper roll. Substituting γ1 and γ2 into the equation set for solving the upper roll projection equation, we obtain the coefficients A1, B1, C1, D1, E1, and F1 of the upper roll projection equation for the inlet cone AB section; substituting γ2 into the equation set for solving the upper roll projection equation, we obtain the coefficients A2, B2, C2, D2, E2, and F2 of the upper roll projection equation for the leveling BC section; substituting γ2 and γ3 into the equation set for solving the upper roll projection equation, we obtain the coefficients A3, B3, C3, D3, E3, and F3 of the upper roll projection equation for the outlet cone CD section. Substitute the coefficients of the projection equations for the upper rolls in the inlet cone AB section, the leveling section BC section, and the outlet cone CD section into the general formula for the upper roll cross-section equation in step 22, and rearrange to determine the upper roll cross-section equation set as shown in the following equation: ； In the formula: A1, B1, C1, D1, E1, and F1 represent the first, second, third, fourth, fifth, and sixth coefficients of the inlet cone AB section roll cross-section equation; A2, B2, C2, D2, E2, and F2 represent the first, second, third, fourth, fifth, and sixth coefficients of the leveling BC section roll cross-section equation; A3, B3, C3, D3, E3, and F3 represent the first, second, third, fourth, fifth, and sixth coefficients of the outlet cone CD section roll cross-section equation. Adjust the feed angle and rolling angle in step 2 as follows: and Repeating step 2 can determine the equation set of the lower roll section; Step 3: Determine the roll box offset; The initial distance between the inner surface of the frame and the roll box is detected using a second laser rangefinder. After a period of operation, the detection distance became The method for obtaining the offset s of the roll box is shown in the following formula: ； In the formula: s represents the offset of the roll box; Indicates the distance detected after use; Indicates the initial detection distance; Step 4: Determine the wear amount of the upper roller and the lower roller; The x-coordinates of the feature points determined in step 1 Substituting the equations for the upper and lower roll sections determined in step 23, the results obtained are as follows: , The method for obtaining the wear amount of the upper and lower rolls is shown in the following formula: ； In the formula: This indicates the amount of wear on the upper roller of the rolling mill; This indicates the amount of wear on the lower roller of the rolling mill; Represents the ordinate of the feature point on the upper roller; Represents the ordinate of the feature point of the lower roller; Indicates the coordinates of the upper roller feature point after wear; Indicates the coordinates of the lower roller feature point after wear; Step 5: Determine the roll opening degree; Roll opening The method for obtaining it is shown in the following formula: ； In the formula: k represents the roll opening degree.

2. The method for detecting roll wear and opening degree of a skew rolling mill according to claim 1, characterized in that, In step 23, γ1 and γ2 are substituted into the coefficient solution system of the upper roll projection equation to obtain the coefficients A1, B1, C1, D1, E1, and F1 of the upper roll projection equation for the AB segment of the inlet cone. Specifically: The methods for obtaining the coefficients A1, B1, C1, D1, E1, and F1 of the projection equation of the roll on the AB segment of the inlet cone are as follows: ； ； ； ； ； 。 3. The method for detecting roll wear and opening degree of a skew rolling mill according to claim 1, characterized in that, In step 23, γ2 is substituted into the coefficient solution system of the upper roll projection equation to obtain the coefficients A2, B2, C2, D2, E2, and F2 of the upper roll projection equation for the BC segment of the leveling process. Specifically: The methods for obtaining the coefficients A2, B2, C2, D2, E2, and F2 of the projection equation of the rolls on the BC section of the leveling mill are as follows: ； ； ； ； ； 。 4. The method for detecting roll wear and opening degree of a skew rolling mill according to claim 1, characterized in that, In step 23, γ2 and γ3 are substituted into the equation set for solving the upper roll projection equation to obtain the coefficients A3, B3, C3, D3, E3, and F3 of the upper roll projection equation for the exit cone CD section. Specifically: The methods for obtaining the coefficients A3, B3, C3, D3, E3, and F3 of the projection equation of the rolls on the CD section of the outlet cone are as follows: ； ； ； ； ； 。 5. The method for detecting roll wear and opening degree of a skew rolling mill according to any one of claims 1-4, characterized in that: The roll wear and opening degree detection method of the skew rolling piercing mill is realized by the roll wear and opening degree detection device of the skew rolling piercing mill. The roll wear and opening degree detection device of the skew rolling piercing mill includes a laser rangefinder, an offset detection device, a core fixing device and a movable device. The laser ranging device includes a first laser ranging sensor, a cooling water jacket, heat insulation material, a purging device, a transparent dustproof layer, and a housing. The first laser ranging sensor is placed in the cooling water jacket, which is filled with circulating cooling water to reduce the temperature of the laser ranging sensor. The first laser ranging sensor is fixedly connected to the cooling water jacket, and a reinforcing gasket is provided between the first laser ranging sensor and the cooling water jacket. The purging device is located around the heat insulation device and fixed to the housing. The heat insulation device includes heat insulation material wrapped around the outside of the cooling water jacket. The transparent dustproof layer is embedded in the housing and is coplanar with the laser emitting side of the first laser ranging sensor. The purging port is attached to the purging device. The offset detection device includes a second laser ranging sensor, which is installed on the inner side of the frame at the gap between the roll box and the frame. The second laser ranging sensor is used to monitor the overall offset of the roll box. The core-fixing device includes a core-holding device, which is used to fix the position of the laser rangefinder and ensure that its centerline coincides with the rolling axis. The movable device includes a transport trolley and a guide rail, and the transport trolley can push the laser rangefinder to move forward at a constant speed on the guide rail.

6. The method for detecting roll wear and opening degree of a skew rolling mill according to claim 5, characterized in that: Both the laser ranging device and the offset detection device are provided in two sets. The laser ranging device is installed on the upper and lower sides of the outer shell, respectively, and the offset detection device is installed in the gap between the upper and lower roll boxes and the inner side of the frame, thereby realizing the simultaneous measurement of the upper and lower rolls.

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