Tube mill roll rolling angle calibration tool and calibration method

Abstract

A tool and method for calibrating the rolling angle of a tube mill roll. The tool comprises a rolling centerline calibration component, which has a calibration tripod and a calibration rod. The calibration rod is installed between two calibration tripods arranged at the entrance and exit of the tube mill, and is used to express the rolling centerline; a roll shaft centerline calibration component, which has a first hanging part, a first needle tip device, a second hanging part and a second needle tip device. The first hanging part is installed at the free end of the tube mill roll, and a first needle tip device with a needle tip pointing away from the tube mill roll is arranged on the first hanging part. The second hanging part is installed at the driving end of the tube mill roll, and a second needle tip device with a needle tip pointing away from the tube mill roll is arranged on the second hanging part. The first needle tip device and the second needle tip device are coaxially arranged to express the roll shaft centerline. The above scheme can measure the roll shafts one by one, which can improve the accuracy of the roll shaft calibration, and has a simple structure, is easy to use, and is not easy to damage.

Description

Technical Field

[0001] The invention belongs to the technical field of rolling mill equipment adjustment, and more specifically, particularly relates to a tube mill roll rolling angle calibration tool and a tube mill roll rolling angle calibration method. Background Art

[0002] The three-roller tube mill is a kind of oblique rolling mill, which uses three sets of rollers to roll bars into seamless steel tubes. The three-roller tube mill includes three roller groups, each of which is equipped with a rolling roller with a certain rolling angle. The rolling angle specifically refers to the angle between the projection of the roller and the rolling line on the main rolling plane.

[0003] At present, in the most typical three-roll tube mill, the rolling angle of the roller is set at 4°. At the same time, in order to ensure the quality of the product after bar rolling, the rolling angle of each roller in the three groups of rollers should be kept consistent (4°). Once the rolling angle of one or more rollers exceeds the allowable range, the rolled tube may have problems such as thread and wall thickness eccentricity. In severe cases, the produced tube may be scrapped as a whole.

[0004] Please refer to Figure 1 and Figure 2 ,in, Figure 1 It is a schematic structural diagram of a typical tripod used for calibrating the rolling angle of a tube mill roll in the prior art; Figure 2 The present invention is a schematic structural diagram of a tripod and a calibration rod which are typically used for calibrating the rolling angle of a tube rolling mill in the prior art.

[0005] In order to avoid the above problems, it is necessary to regularly measure the angle of the roller shaft on the three-roll tube mill, that is, to calibrate the three-roll tube mill unit. The tooling used for calibrating the rolling angle of the roller shaft includes a tripod 1' and a calibration rod 2'. The calibration rod 2' is designed according to the standard three-roll tube mill roller shaft structure, that is, the calibration rod 2' is installed on the three-roll tube mill with a standard structure through the tripod 1', and a calibration ring 3' that can contact the three roller shafts (rolling sections on the roller shafts) at the same time is arranged on the calibration rod 2'. Then, when it is necessary to roll the angle of the roller shaft of the three-roll tube mill, the tripod is installed on the three-roll tube mill that needs to be calibrated and the calibration rod is installed. The roller shaft of the three-roll tube mill is adjusted so that each roller shaft can contact the calibration ring, so as to realize the calibration of the rolling angle of the roller shaft.

[0006] The above-mentioned calibration method for the roll shaft of the three-roll tube mill has the following problems: 1. It can only calibrate the roll shaft of the three-roll tube mill with a rolling angle of 4°, and other angles cannot be found; 2. It is difficult to find the equipment processing and assembly errors; 3. Improper operation can easily cause the calibration rod to bend and deform. In addition, the above-mentioned calibration method is also likely to cause the rolling angles of the three roll shafts to be inconsistent. For example, even if the three roll shafts are in contact with the calibration ring, one or more of the roll shafts will still have errors. In this case, the steel pipes produced will have threads on the inner and outer surfaces, and the wall thickness uniformity is poor.

[0007] In summary, how to solve the problem of poor calibration accuracy in the rolling angle calibration method of the three-roller tube mill in the prior art has become an urgent problem to be solved by those skilled in the art. Summary of the invention

[0008] The object of the present invention is to provide a tool and method capable of simplifying the calibration of the rolling angle of a three-roll tube rolling mill.

[0009] In order to achieve the above object, the present invention provides the following technical solutions:

[0010] A rolling angle calibration tool for a tube mill roll, comprising: a rolling center line calibration component for representing a rolling center line, the rolling center line calibration component comprising a calibration tripod for installation at the entrance and exit positions of the tube mill and a calibration rod connected to the two calibration tripods to represent the rolling center line; and a roll shaft center line calibration component for representing the roll shaft center line, the roll shaft center line calibration component comprising a first hoisting component, a first needle tip device, a second hoisting component and a second needle tip device, the first hoisting component being installed at the free end of the tube mill roll for being hoisted by a rope, a first needle tip device with a needle tip pointing away from the tube mill roll being arranged on the first hoisting component, the second hoisting component being installed at the driving end of the tube mill roll for being connected to a driving mechanism, a second needle tip device with a needle tip pointing away from the tube mill roll being arranged on the second hoisting component, the first needle tip device and the second needle tip device being coaxially arranged to represent the roll shaft center line.

[0011] In the rolling angle calibration tool for the tube mill roll as described above, preferably, the first lifting component is a lifting handle, the lifting handle includes a sleeve and a left end cover connected to the left end of the sleeve and a right end cover connected to the right end of the sleeve respectively, the sleeve is used to be sleeved with a lifting rope, the left end cover is equipped with the first needle tip device, and the right end cover is connected to the free end of the tube mill roll.

[0012] In the tube mill roll rolling angle calibration tool as described above, preferably, the first needle tip device comprises: a first tip portion and a connecting portion connected in sequence, the first tip portion is conical, the connecting portion is columnar, and a thread is formed on the right end of the connecting portion to be threadedly connected to the left end cover of the hanging handle.

[0013] In the tube mill roll rolling angle calibration tool as described above, preferably, a groove is formed at the left end of the connecting portion along the circumference of the connecting portion, and the bottom of the groove includes at least two opposite planes to contact the rotating part for rotating the first needle tip device.

[0014] In the tube mill roll rolling angle calibration fixture as described above, preferably, the second lifting member is a spline sleeve, the sleeve body of the spline sleeve is used to be sleeved by a lifting rope, and the inner hole formed by the spline sleeve is installed with a second needle tip device.

[0015] In the tube mill roll rolling angle calibration tool as described above, preferably, the second needle tip device comprises: a second tip and a second sleeve; the second tip is conical, the right end of the second sleeve is connected to the left end of the second tip, and the left end of the second sleeve is installed on the driving end of the tube mill roll.

[0016] In the above-mentioned tube mill roll rolling angle calibration tool, preferably, the calibration rod comprises: a first calibration tip, a rod portion and a second calibration tip which are connected in sequence.

[0017] In the rolling angle calibration tool for the tube mill as described above, preferably, the calibration tripod comprises: a central portion, the central portion is provided with a mounting hole for mounting the calibration rod, and the calibration rod protrudes from the mounting hole; and an arm portion, radiating radially outward from the central portion, the arm portion is three in number and evenly arranged along the circumference of the central portion, the free end of the arm portion is provided with a through hole for mounting at the entrance or exit position of the tube mill.

[0018] A method for calibrating the rolling angle of a tube mill roll is used to calibrate the rolling angle of a tube mill roll shaft by using the above-mentioned tube mill roll rolling angle calibration tool. The specific steps are as follows: respectively setting the calibration tripods at the inlet and outlet positions of the tube mill, then setting the calibration rod between the two calibration tripods and extending them out of the calibration tripods, and expressing the rolling center line through the calibration rod; setting the first hanging member, and installing the first needle tip device on the first hanging member, and then setting the first hanging member to the free end of the tube mill roll, setting the second hanging member, and installing the second needle tip device on the second hanging member, and then setting the second hanging member to the driving end of the tube mill roll, the first needle tip device and the second needle tip device are coaxial, and the center line of the roll is expressed by the first needle tip device and the second needle tip device; calibrating the rolling angle according to the distance between the tips of the first needle tip device and the second needle tip device and the center line of the calibration rod, and the distance between the first needle tip device and the second needle tip device in the direction of the center line of the roll.

[0019] In the method for calibrating the rolling angle of a tube mill roll as described above, preferably, the rolling angle is calibrated according to the distance between the tips of the first needle tip device and the second needle tip device and the center line of the calibration rod, and the distance between the first needle tip device and the second needle tip device in the direction of the center line of the roll, specifically including: measuring the distance S between the tip of the first needle tip device and the tip of the second needle tip device, measuring the distance H1 between the tip of the first needle tip device and the left end of the calibration rod, and measuring the distance H2 between the tip of the second needle tip device and the right end of the calibration rod; calibrating the rolling angle according to △H=tgα×S, wherein α is the rolling angle, and △H=H1-H2.

[0020] Through the above-mentioned structural design, in the rolling angle calibration tooling of the tube mill provided by the present invention, it includes a rolling center line calibration component and a roll shaft center line calibration component, the rolling center line calibration component includes a tripod and a calibration rod, the tripod is installed on the inlet and outlet of the tube mill, the calibration rod is installed on the tripod, and is used to express and calibrate the rolling center line, the roll shaft center line calibration component includes a first hoisting member, a second hoisting member, a first needle tip device and a second needle tip device, the first needle tip device and the second needle tip device can express the center line of the roll shaft, can express the center line of the roll shaft, through spatial measurement and calculation, the angle in space between the roll shaft center line (the first needle tip device and the second needle tip device) and the rolling center line (the center line of the calibration rod) can be obtained, and the angle is the angle of the roll shaft rolling angle. The present invention can measure the roll shafts one by one, which can greatly improve the accuracy of roll shaft calibration. In addition, the present invention has a simple structure and is easy to use, thus solving the problem that the calibration rod is easily damaged in the traditional technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0022] Figure 1 It is a schematic structural diagram of a typical tripod used for calibrating the rolling angle of a tube mill roll in the prior art;

[0023] Figure 2 The present invention is a schematic structural diagram of a tripod and a calibration rod which are typically used for calibrating the rolling angle of a tube rolling mill in the prior art.

[0024] Figure 1 and Figure 2 The corresponding relationship between the component names and the reference numerals is as follows:

[0025] Tripod 1', calibration rod 2', calibration ring 3'.

[0026] Figure 3 It is a schematic structural diagram of a tripod in one embodiment of the present invention;

[0027] Figure 4 It is a structural schematic diagram of a calibration rod in one embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of a hanging handle used to install one end of a first needle tip device in one embodiment of the present invention;

[0029] Figure 6 This is a schematic structural diagram of a first needle tip device in one embodiment of the present invention;

[0030] Figure 7 It is a schematic structural diagram of a second needle tip device in one embodiment of the present invention;

[0031] Figure 8 It is a structural schematic diagram of a roll angle calibration tool for a tube mill in one embodiment of the present invention when the roll axis is parallel to the rolling center line in the use state;

[0032] Fig. 9 It is a structural schematic diagram of a rolling angle calibration tool for a tube mill roll in an embodiment of the present invention when the roll axis is inclined by 4° to the rolling center line in a use state;

[0033] Fig.10 It is a structural schematic diagram of a spline sleeve in one embodiment of the invention;

[0034] Fig.11 It is a schematic diagram of the structure of the roller when the roller axis is parallel to the rolling center line;

[0035] Fig.12It is a schematic diagram of the local structure when the roller axis is inclined at 4° relative to the rolling center line;

[0036] Figures 3 to 12 The corresponding relationship between the component names and the reference numerals is as follows:

[0037] Calibration tripod 1, center portion 11, mounting hole 111, arm portion 12, through hole 121, calibration rod 2, first calibration tip 21, rod portion 22, second calibration tip 23, hanging handle 3, sleeve 31, left end cover 32, right end cover 33, first needle tip device 4, first tip 41, connecting portion 42, groove 421, second needle tip device 5, second tip 51, second sleeve 52, spline sleeve 6;

[0038] Virtual line a parallel to the rolling center line, roller axis b, and rolling section c. DETAILED DESCRIPTION

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention encompasses such modifications and variations within the scope of the appended claims and their equivalents.

[0040] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0041] Please refer to Figures 3 to 12 ,in, Figure 3 It is a schematic structural diagram of a tripod in one embodiment of the present invention; Figure 4 It is a structural schematic diagram of a calibration rod in one embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a hanging handle used to install one end of a first needle tip device in one embodiment of the present invention; Figure 6 This is a schematic structural diagram of a first needle tip device in one embodiment of the present invention; Figure 7It is a schematic structural diagram of a second needle tip device in one embodiment of the present invention; Figure 8 It is a structural schematic diagram of a roll angle calibration tool for a tube mill in one embodiment of the present invention when the roll axis is parallel to the rolling center line in the use state; Fig. 9 It is a structural schematic diagram of a rolling angle calibration tool for a tube mill roll in an embodiment of the present invention when the roll axis is inclined by 4° to the rolling center line in a use state; Fig.10 It is a structural schematic diagram of a spline sleeve in one embodiment of the present invention; Fig.11 It is a schematic diagram of the structure of the roller when the roller axis is parallel to the rolling center line; Fig.12 It is a schematic diagram of the local structure when the roller axis is inclined at 4° relative to the rolling center line.

[0042] The present invention provides a tube mill roll rolling angle calibration tool, which is used to calibrate the adjustment of the tube mill roll rolling angle. The tube mill may be an Assel tube mill.

[0043] See Fig. 9 The rolling angle can be adjusted according to the process requirements during the production process, and is usually adjustable within the range of 0° to 4°. In the present invention, the roller is designed according to a rolling angle of 4°. When the center line of the roller axis is inclined 4° from the rolling center line (or the rolling mill center line), the rolling section is parallel to the rolling center line. In this installation state, the steel pipe is rolled most fully, and the wall thickness of the rolled steel pipe is uniform and the inner surface thread is relatively slight.

[0044] In the present invention, the tube mill roll rolling angle calibration tool comprises two groups of components, one group is a rolling center line calibration component for representing the rolling center line, and the other group is a rolling shaft center line calibration component for representing the roll shaft center line.

[0045] Specifically, the rolling center line calibration assembly includes a calibration tripod 1 for installation at the entrance and exit of a tube rolling mill, and a calibration rod 2 connected to the two calibration tripods 1 for representing the rolling center line.

[0046] There are two calibration tripods 1, which are respectively installed at the inlet and outlet of the tube rolling mill. The structures of the inlet and outlet of the tube rolling mill are relatively stable, and deformation, dimensional deviation and other problems will not occur. Therefore, the calibration tripod 1 is installed at the inlet and outlet of the tube rolling mill. When the calibration tripod 1 has a high installation accuracy, the calibration rod 2 is set on the calibration tripod 1, and the calibration rod 2 can represent the rolling center line, that is, the center line of the calibration rod 2 is the rolling center line.

[0047] Specifically, the calibration tripod 1 includes a center portion 11 and an arm portion 12. A mounting hole 111 is provided on the center portion 11, in which a calibration rod 2 is inserted, and the calibration rod 2 is exposed outside the mounting hole 111. The arm portion 12 extends radially along the center portion 11, and a through hole 121 is provided at the free end of the arm portion 12, through which the protruding parts (such as a cylindrical shaft) arranged at the inlet and outlet positions of the tube rolling mill are connected, so as to realize the installation of the calibration tripod 1 on the tube rolling mill. There are multiple arms 12, and the multiple arms 12 are evenly arranged along the circumference of the center portion 11. Preferably, the number of the arms 12 is 3.

[0048] In order to facilitate the drawing of the rolling center line, the calibration rod 2 includes: a first calibration tip 21, a rod 22 and a second calibration tip 23. The first calibration tip 21 is conical and connected to the left end of the rod 22. The second calibration tip 23 is conical and connected to the right end of the rod 22. The rod 22 can be cylindrical.

[0049] In the prior art, the calibration of the rolling angle of the roller is achieved by a calibration ring provided on the calibration rod 2 (the rolling section of the roller is in contact with the calibration ring on the calibration rod). This calibration method is prone to cause calibration errors.

[0050] In order to improve the calibration accuracy, the present invention is particularly provided with a roll shaft centerline calibration assembly, which includes: a first hoisting member, a first needle tip device 4, a second hoisting member and a second needle tip device 5. The first hoisting member is installed at the free end of the tube mill roll and is used to be hoisted with a rope. The first needle tip device 4 is arranged on the first hoisting member, and its needle tip points away from the tube mill roll, such as Figure 7 The needle tip points to the left. The second hanging member is installed at the driving end of the tube mill roll, and is used to connect with the driving mechanism to drive the roll to rotate under the drive of the driving mechanism. The second needle tip device is arranged on the second hanging member, and its needle tip points away from the tube mill roll, such as Figure 7 The needle tip points to the right. The first needle tip device and the second needle tip device are coaxially arranged to represent the center line of the roller shaft. The distance between the tip of the first needle tip device and the tip of the second needle tip device must be equal to the length of the calibration rod.

[0051] In order to facilitate hoisting and installation, the first hoisting part is a hoisting handle 3, which includes: a sleeve 31, a left end cover 32 and a right end cover 33. The sleeve 31 is columnar and has a certain length so that it can be hoisted by a rope. The left end cover 32 is connected to the left end of the sleeve 31, and a through hole is opened on the left end cover 31 for installing the first needle tip device 4. The right end cover 33 is connected to the right end of the sleeve 31 and connected to the free end of the roller of the rolling mill. The free end of the roller of the rolling mill is located at the entrance of the rolling mill. When used, the design principle of the hoisting handle 3 is as follows: the structure of the hoisting handle 3 is designed according to the end structure of the roller shaft of the rolling mill, and the design standard is that it can be assembled on the roller shaft of the rolling mill; after the end structure of the hoisting handle 3 is designed, the center line of the hoisting handle 3 is found, and an assembly hole coaxial with its center line is opened at the end of the hoisting handle 3.

[0052] Specifically, the first needle tip device 4 includes: a first tip portion 41 and a connecting portion 42. The first tip portion 41 is conical. The left end of the connecting portion 42 is connected to the right end (or bottom end) of the first tip portion 41, and the right end of the connecting portion 42 is formed with a thread to be threadedly connected to the left end cover 33 of the hanging handle. The connecting portion 42 can be cylindrical.

[0053] In order to facilitate the screwing of the first needle tip device 4, a groove 421 is formed at the left end of the connection 42 along the circumference of the connection part 42, and the bottom of the groove includes at least two opposite planes, so that a rotating member, such as a wrench, can clamp the two opposite planes to achieve the clamping of the first needle tip device and screwing. The bottom of the groove can be quadrilateral, hexagonal, etc.

[0054] Specifically, the second hoisting component is a spline sleeve 6, the sleeve body of the spline sleeve is used to be sleeved by the hoisting rope, and the inner hole formed by the spline sleeve is detachably mounted with the second needle tip device 5.

[0055] Preferably, the second needle tip device 5 comprises: a second tip 51 and a second sleeve 52. The second tip 51 is conical. The right end of the second sleeve 52 is connected to the left end of the second tip 51, and the left end of the second sleeve 52 is installed on the driving end of the tube mill roll. The second tip 51 needs to be coaxial with the first tip 41, so that the axis of the two is the center line of the roll.

[0056] Since the rolling center line and the center line of the roller shaft are both specifically expressed, the spatial angle between the center line of the roller shaft (the first needle tip device 4 and the second needle tip device 5) and the rolling center line (the center line of the calibration rod 2) can be obtained through spatial measurement and calculation. This angle is the angle of the rolling angle of the roller.

[0057] The present invention provides a method for calibrating the rolling angle of a tube mill roll. The method uses the above-mentioned tube mill roll rolling angle calibration tool to calibrate the rolling angle of the tube mill roll.

[0058] In the rolling angle calibration method of the tube mill roll provided by the present invention, the specific steps are as follows, including: setting a calibration tripod 1 on the inlet and outlet of the tube mill, and then setting a calibration rod 2 on the tripod, and expressing the rolling center line through the calibration rod 2; setting a first hanging member, and installing a first needle tip device 4 on the first hanging member, and then setting the first hanging member to the free end of the tube mill roll, setting a second hanging member, and installing a second needle tip device 5 on the second hanging member, and then setting the second hanging member 5 to the driving end of the tube mill roll, the first needle tip device 4 and the second needle tip device 5 are coaxial, and the center line of the roll is expressed by the first needle tip device 4 and the second needle tip device 5, and the rolling angle is calibrated according to the distance between the tips of the first needle tip device and the second needle tip device and the center line of the calibration rod, and the distance between the first needle tip device and the second needle tip device in the direction of the center line of the roll.

[0059] The first needle tip device 4 (see Figure 4 ) into the handle (see Figure 5 ), the second needle tip device 5 (see Figure 6 ) into the spline bushing (see Fig.10 ), the main purpose is to lead out the center line of the roller shaft, and then install two tripods at the entrance and exit of the tube rolling mill ( Figure 8 ), then move the calibration rod ( Figure 3 ) Mount on a tripod ( Figure 1 ) The main purpose of the circular hole is to lead out the center line of the rolling mill. By measuring the required distance mentioned above, the rolling angle of the three rollers of the Assel tube mill can be found out, which is 0°~4° (the angle required by the process).

[0060] For example: set the suspension handle 3 equipped with the first needle tip device 4 and the spline sleeve 6 of the second needle tip device 5, the overall length S of the first needle tip device 4 and the second needle tip device 5 is the same as the length of the calibration rod 2, the suspension handle 3 and the spline sleeve 6 are respectively installed at both ends of the roller, when the roller axis is set horizontally, its entrance height (that is, the distance between the tip of the first needle tip device and the tip of the calibration rod on the same side) H1 and the exit height H2 (the distance between the tip of the second needle tip device and the tip of the calibration rod on the same side) are consistent, when the rolling angle is 4°, the roller axis tilts the rolling center line 4° to ensure product quality, then there will be a difference △H between the height H1 of the roller entrance end and the height H2 of the roller outlet end, that is, tgα×S=△H. Take S as 1711mm and △H as 119.64mm as an example, then tg4°×1711=119.64mm, α=4°.

[0061] After calculating the value, the present invention can accurately calibrate the center line of the roll and the rolling center line. The above-mentioned overall length refers to the straight-line distance from the tip of the first needle tip device to the tip of the second needle tip device.

[0062] The present invention uses a special calibration rod: 1. The calibration rod is easy to manufacture and easy to operate. 2. Any angle required for rolling can be found. 3. The equipment processing and assembly errors can be found, which is convenient for accurately finding the angle of the required rolling roller rolling angle. 4. The calibration rod will not be bent or deformed during operation. 4. The inner and outer surface quality and dimensional tolerance of the steel pipe are greatly improved.

[0063] Through the above-mentioned structural design, in the rolling angle calibration tooling of the tube mill provided by the present invention, it includes a rolling center line calibration component and a roll shaft center line calibration component, the rolling center line calibration component includes a calibration tripod 1 and a calibration rod 2, the calibration tripod 1 is installed on the inlet and outlet of the tube mill, the calibration rod 2 is installed on the calibration tripod 1, and is used to represent and calibrate the rolling center line, the roll center line calibration component includes a first hoisting member, a first needle tip device 4, a second hoisting member and a second needle tip device 5, the first needle tip device 4 and the second needle tip device 5 can represent the center line of the roll shaft, and through spatial measurement and calculation, the angle in space between the roll shaft center line (the first needle tip device 4 and the second needle tip device 5) and the rolling center line (the center line of the calibration rod 2) can be obtained, and the angle is the angle of the roll shaft rolling angle. The present invention can measure the three roller shafts of the tube rolling mill one by one, which can greatly improve the accuracy of roller shaft calibration. In addition, the present invention has a simple structure and is easy to use, which solves the problem that the calibration rod 2 is easily damaged in the traditional technology.

[0064] Please refer to Table 1, which is a table showing the dimensions of the pipe after rolling using the prior art calibration method.

[0065] 127X20

[0066]

[0067] Please refer to Table 2, which is a table showing the dimensions of the pipe after rolling using the calibration method of the present invention.

[0068] 127X20

[0069]

[0070] From the comparison between Table 1 and Table 2, it can be seen that the wall thickness differences of the rolled tubes obtained by the tube mill calibrated by the present invention in the first five groups of data are all smaller than the corresponding values ​​in Table 1. It can be seen that the actual use of the present invention has indeed achieved the effect of reducing the calibration error.

[0071] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for calibrating the rolling angle of a tube mill roll, characterized in that: Use the tube mill roll rolling angle calibration tool to calibrate the rolling angle of the tube mill roll shaft; The tube mill roll rolling angle calibration tool comprises: A rolling centerline calibration assembly for representing a rolling centerline, the rolling centerline calibration assembly comprising a calibration tripod for installation at the entrance and exit positions of a tube rolling mill and a calibration rod (2) connected to two calibration tripods (1) for representing a rolling centerline; and A roller shaft centerline calibration component for representing the centerline of a roller shaft, the roller shaft centerline calibration component comprising a first hoisting component, a first needle tip device (4), a second hoisting component and a second needle tip device (5), the first hoisting component being mounted on the free end of a roller of a tube mill and being used to be hoisted by a rope, a first needle tip device having a needle tip pointing away from the roller of the tube mill being arranged on the first hoisting component, the second hoisting component being mounted on the driving end of the roller of the tube mill and being used to be connected to a driving mechanism, a second needle tip device having a needle tip pointing away from the roller of the tube mill being arranged on the second hoisting component, the first needle tip device and the second needle tip device being coaxially arranged to represent the centerline of the roller shaft, The first lifting member is a lifting handle (3), which comprises a sleeve and a left end cover connected to the left end of the sleeve and a right end cover connected to the right end of the sleeve respectively, the sleeve is used to be covered with a lifting rope, the left end cover is equipped with the first needle tip device, and the right end cover is connected to the free end of the tube rolling mill roller. The first needle tip device comprises: a first tip portion and a connecting portion connected in sequence, the first tip portion is conical, the connecting portion is columnar, a thread is formed on the right end of the connecting portion to be threadedly connected to the left end cover of the suspension handle, A groove is formed at the left end of the connecting portion along the circumference of the connecting portion, and the bottom of the groove includes at least two opposite planes for contacting with a rotating member for rotating the first needle tip device. The second lifting member is a spline sleeve (6), the sleeve body of the spline sleeve is used to be sleeved by the lifting rope, and the inner hole formed by the spline sleeve is installed with a second needle tip device. The second needle tip device comprises: a second tip portion and a second sleeve; The second tip is conical, the right end of the second sleeve is connected to the left end of the second tip, and the left end of the second sleeve is mounted on the driving end of the tube mill roll. The second tip is coaxial with the first tip, The calibration tripod comprises: A central portion, wherein the central portion is provided with a mounting hole for mounting the calibration rod, and the calibration rod protrudes from the mounting hole; and The arm portion radiates radially outward from the central portion. The arm portion is three in number and is evenly arranged along the circumference of the central portion. The free end of the arm portion is provided with a through hole for installation at the inlet or outlet of the tube rolling mill. The calibration rod comprises: a first calibration tip, a rod portion and a second calibration tip which are connected in sequence. The specific steps of calibrating the rolling angle of the tube mill roll shaft using the tube mill roll rolling angle calibration tool are as follows, including: The calibration tripods are respectively arranged at the inlet and outlet positions of the tube rolling mill, and then a calibration rod is arranged between the two calibration tripods and extends out of the calibration tripods, and the rolling center line is represented by the calibration rod; The first hanging part is provided, and the first needle tip device is installed on the first hanging part, and then the first hanging part is provided to the free end of the roller of the tube mill, the second hanging part is provided, and the second needle tip device is installed on the second hanging part, and then the second hanging part is provided to the driving end of the roller of the tube mill, the first needle tip device is coaxial with the second needle tip device, and the center line of the roller is expressed by the first needle tip device and the second needle tip device; The rolling angle is calibrated according to the distance between the tip of the first needle tip device and the second needle tip device and the center line of the calibration rod, and the distance between the first needle tip device and the second needle tip device in the direction of the center line of the roller. The method of calibrating the rolling angle according to the distance between the tip of the first needle tip device and the second needle tip device and the center line of the calibration rod, and the distance between the first needle tip device and the second needle tip device in the direction of the center line of the roller specifically includes: Measure the distance S between the tip of the first needle tip device and the tip of the second needle tip device, measure the distance H1 between the tip of the first needle tip device and the left end of the calibration rod, and measure the distance H2 between the tip of the second needle tip device and the right end of the calibration rod; The rolling angle is calibrated according to △H=tgα×S, where α is the rolling angle and △H=H1-H2.

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