WO2020015555A1 - 一种角部增厚的冷热复合成形方矩形管成型系统 - Google Patents

一种角部增厚的冷热复合成形方矩形管成型系统 Download PDF

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WO2020015555A1
WO2020015555A1 PCT/CN2019/095281 CN2019095281W WO2020015555A1 WO 2020015555 A1 WO2020015555 A1 WO 2020015555A1 CN 2019095281 W CN2019095281 W CN 2019095281W WO 2020015555 A1 WO2020015555 A1 WO 2020015555A1
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corner
rectangular tube
forming
finishing
cold
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PCT/CN2019/095281
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English (en)
French (fr)
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韩静涛
徐海峰
王宇
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欣诺冷弯型钢产业研究院（曹妃甸）有限公司
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Priority to AU2019305746A priority Critical patent/AU2019305746B2/en
Publication of WO2020015555A1 publication Critical patent/WO2020015555A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/30—Finishing tubes, e.g. sizing, burnishing

Definitions

  • the invention relates to the technical field of metal material forming equipment, and more particularly, to a cold-heat composite forming rectangular rectangular pipe forming system with thickened corners.
  • the steel structure material is known as one of the "green buildings" in the 21st century, and the square rectangular steel pipe is the best column material in the steel structure.
  • the traditional cold-formed rectangular rectangular pipe is due to the secondary work hardening effect of the cold-formed process.
  • the corner of the rectangular pipe has a large residual stress, which directly leads to a reduction in its ductility. At the same time, it may cause cracks during use, which greatly limits the scope of use of the rectangular pipe.
  • the rectangular pipes used in high-rise buildings are all rectangular pipes welded from 4 steel plates, which has great limitations; meanwhile, the corner radius of cold-formed rectangular pipes is very large, and the welding performance is very good. Poor, it is necessary to use corner additions and other methods to improve its welding performance, but this will increase manufacturing costs.
  • the present invention proposes a cold-heat composite forming rectangular rectangular pipe forming system with a thickened corner.
  • the hot forming technology is introduced, that is, the local induction heating technology. High temperature can not only reduce the forming force of the material and improve the forming performance of the material; at the same time, it can eliminate the residual stress and cracking caused by work hardening, and the corner contour of the rectangular rectangular tube that is formed by cold and hot composite is dense, and the inner and outer corner radius It is small, the angle of the corner is close to 90 °, and the corner is thickened.
  • the purpose of the present invention is to provide a cold-heat composite forming rectangular rectangular tube forming system with thickened corners.
  • Loading device rolling introduction unit, local induction heating unit, finishing unit, water cooling device, air cooling zone and cutting device connected in order;
  • Finishing unit includes: frame and four rolls;
  • Each roll is provided with a roll movement control knob to control the rolls to move in the lateral, longitudinal and forming directions at the same time;
  • a rack rotation control button is provided on the rack to control the rotation of the rack
  • the precision forming unit is provided with a thermometer and an automatic feedback device.
  • the local induction heating device is provided with an induction coil, and the induction coils are covered with a layer of silicon steel sheet corresponding to the four corners of the rectangular tube, and the four corners of the opposite rectangular tube are heated.
  • the number of the finishing units is N, and N is an odd number greater than 1.
  • a heat-preserving device is provided between the two finishing units.
  • the even-numbered finishing unit is fixed; the even-numbered finishing unit can rotate. Rotate clockwise or counterclockwise around the axis of the forming system.
  • the number of finishing units is preferably five;
  • the first, third, and fifth finishing units are fixed; the second and fourth finishing units can rotate, and rotate clockwise or counterclockwise around the axis of the forming system.
  • the rotation angles of the second and fourth finishing units are 0-3 °.
  • the second and fourth finishing units are rotated by a turbine worm unit.
  • the difference between the roll diameters of the two adjacent finishing forming units is 1 to 5 mm.
  • the thermal insulation device is a flame spray gun thermal insulation device
  • Feeding device feeding pre-finished rectangular steel pipes into the production system
  • Two roll-introducing units After two passes of the roll-introducing system, the rectangular tube is smoothly and symmetrically introduced into the subsequent production system.
  • Local induction heating device In this system, a layer of silicon steel sheet is wrapped outside the four corners of the rectangular tube corresponding to the induction coil, and the magnetic distribution of the silicon steel sheet is used to guide the local distribution of electromagnetic wires, thereby achieving large rounded corners.
  • the rectangular square tube is used for local heating at the four corners.
  • the heating temperature range is 750 ° C to 1100 ° C.
  • the heating time is determined according to the type of steel and the heating frequency. .
  • Finishing unit 5 finishing units together form a thermal finishing and straightening process.
  • the temperature of the finishing stage is controlled between 700-950 ° C.
  • the cross-sectional area of the rectangular tube The degree of deformation is in the range of 0-5%.
  • the second and fourth units can be twisted in opposite directions to the rectangular tube at an angle of 0-3 ° to ensure the straightness of the rectangular tube.
  • the speed of the five finishing units is different. It will be a little faster than the previous one, so tension will be generated between passes. Under the joint action of tension and the 2nd and 4th units, the other rectangular tube will perform the shaping and straightening functions, eliminating the thermal finishing process. Redundant deformations such as distortion and warping. )
  • Each precision forming frame is equipped with a thermometer and an automatic feedback system to detect and feedback the temperature of the formed rectangular tube to ensure the constant temperature of the rectangular tube during the heating process.
  • one is set between two adjacent frames to ensure the constant temperature of the pipe and the temperature is controlled at 700-950 ° C.
  • the water cooling system is used to control the cooling of the rectangular tube to ensure the strength performance of the finished rectangular tube.
  • the final cooling temperature is set at about 350 ° C, and the cooling speed is controlled according to different steel types and performance requirements.
  • the water-cooled rectangular tube will gradually cool down with room temperature.
  • the finished rectangular tube is cut horizontally and cut according to the actual required length.
  • the cold-heat composite forming rectangular rectangular tube forming system with thickened corners of the present invention combines the advantages of roll bending forming and hot forming. It mainly solves the problems of corner thinning, large radius and residual stress of cold-formed rectangular pipes. Through the research of the process of thickening the rectangular pipe at the corner, the feasibility of the hot roll bending process for the thickening of the rectangular pipe at the corner is explained.
  • the cold-heat composite forming rectangular rectangular pipe forming system with thickened corners of the present invention belongs to the field of local heating roll bending forming equipment, and is used for solving the problem of corner thinning in cold bending forming of rectangular pipes.
  • the rectangular tube involved in molding is anhydrous, and the device itself is a secondary molding device.
  • the incoming unit is provided with at least 2 passes in turn, so that the primary forming rectangular tube enters the back equipment smoothly and symmetrically.
  • Induction heating uses a specific heating coil to heat it.
  • the secondary finishing unit includes 5 passes. It plays the role of shaping and straightening, and is inserted into the flame spray gun insulation device to prevent the temperature of the rectangular tube from decreasing.
  • the water-cooled device is used to quench the formed rectangular tube to ensure the strength performance of the finished product.
  • the four corner portions of a rectangular tube can be heated uniformly, accurately and simultaneously under the conditions of the plane area of the base material. It is also equipped with an automatic feedback temperature adjustment system. This system uses a temperature measuring instrument to capture the temperature before forming and feed it back to the induction heating system. If the measured temperature is within the forming temperature range, it maintains the current power; if it is not, it quickly rises or Reduce the power to adjust the appropriate forming temperature to ensure a constant heating temperature.
  • the rolls of the prior art precision forming units are rolled on the planes of the four sides of the rectangular tube, and the rolls cannot be moved. Therefore, as long as the length of the side of the rectangular tube produced, the rolls need to be large. This greatly limits the production of rectangular pipes of large size specifications.
  • a set of equipment can only produce one size of product.
  • the rolls of the finishing unit of the present invention are distributed at the four corners of the rectangular tube, and are directly roll-formed to the four outer corners of the rectangular tube, and the rolls at the four corners can perform the lateral, vertical, and forming directions simultaneously ( Oblique) movement to apply to the forming of rectangular tubes of different sizes.
  • the forming size range of the rectangular pipe prepared by the system of the present invention is greatly improved compared with the prior art, and a square rectangular steel pipe with a circumference of 80mm-9600mm and a wall thickness of 6mm-80mm can be produced at most.
  • the present invention uses roll forming at the corner of the rectangular tube, and can replace the rolls to produce products of all specifications with one set of equipment, which greatly reduces the cost of production.
  • the first, third, and fifth finishing forming units are fixed to ensure the stability of the travel direction and forming direction of the rectangular tube during the forming process.
  • the unit can be rotated, and it can straighten and correct redundant distortions such as distortion and warping during the molding process, and eliminate various defects, which greatly improves the shape accuracy and performance quality of the rectangular tube products.
  • the corner shape of the rectangular tube can be changed to a greater extent, so that it is closer to a right angle, and the corner wall thickness is more obvious. This improves the cross-section performance of the rectangular tube.
  • the mechanical properties and welding properties have become better, and the range of wall thickness sizes that can be produced for rectangular pipes has also become larger.
  • each of the subsequent finishing units has a heat insulation device to ensure that the temperature of the rectangular tube is constant during the entire finishing process.
  • the forming temperature of the rectangular tube is constant, and the deformation is easier.
  • the corners of the rectangular tube can be turned into right angles more easily and easily.
  • the increase in the thickness of the corner wall also becomes natural.
  • the size of the rectangular tube that can be produced also becomes larger. Performance conditions would be better.
  • the present invention has the following advantages:
  • a corner-thickened cold-heat composite forming rectangular tube forming system adds induction heating equipment and thermal insulation equipment.
  • the secondary forming process is performed under high temperature conditions, which greatly improves The performance of the corner of the rectangular tube is reduced, the residual stress is prevented, and work hardening is prevented.
  • the base material is basically not affected under the condition of ensuring the strength of the raw material.
  • the wear of the equipment during the forming process is reduced.
  • the addition of a water cooling device can ensure the rectangular tube's performance. Mechanical properties.
  • the device covers the production of all steel types, and the scale of production at the same time is wide, ranging from 80mm-9600mm in circumference and 6mm-80mm in wall thickness.
  • FIG. 1 is a schematic diagram of a corner thickening rectangular pipe forming system provided by the present invention
  • FIG. 2 is a schematic diagram of the rotation of the fine forming unit of the present invention.
  • FIG. 3 is a schematic structural diagram of a finishing unit according to the present invention.
  • FIG. 4 is a schematic diagram of rolling of a prior art finishing unit
  • Figure 5 is a schematic diagram of the rolling of the finishing unit of the present invention.
  • FIG. 6 is a schematic diagram of a local induction heating device according to the present invention.
  • a corner-thickened cold-heat composite forming rectangular tube forming system includes: a feeding device 1, a roll introduction unit 2, a local induction heating device 3, a finishing unit 4, a water cooling device 7, and an air-cooling zone, which are sequentially connected. 8 and cutting device 9;
  • the finishing unit 4 includes: a frame and four rolls 13;
  • Each roll 13 is arranged in the frame and distributed at the four corners of the rectangular tube. Each roll is provided with a roll movement control knob 12 to control the rolls to move horizontally, vertically and in the forming direction at the same time.
  • a rack rotation control button 14 is provided on the rack to control the rotation of the rack
  • the finishing unit 4 is provided with a temperature measuring device and an automatic feedback device 5.
  • the local induction heating device 2 is provided with an induction coil 16.
  • the induction coils are covered with a layer of silicon steel sheet 15 at the four corners of the rectangular tube, and the other corners of the rectangular tube are heated.
  • the first, third and fifth finishing units are fixed; the second and fourth finishing units can be rotated, and the second and fourth finishing units can be rotated.
  • the heat preservation device is a flame spray gun heat preservation device 6.
  • the molding methods include:
  • the temperature of the flame spray gun insulation system between each two forming units is 950 ° C, and the roll diameter difference between each two adjacent finishing units is 3mm.
  • the degree of deformation of the forming unit is about 3%.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Heat Treatment Of Articles (AREA)
  • General Induction Heating (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)

Abstract

一种角部增厚的冷热复合成形方矩形管成型系统，包括依次连接的上料装置（1）、辊压导入机组（2）、局部感应加热装置（3）、精成形机组（4）、水冷装置（7）、空冷区（8）和切割装置（9）；精成形机组包括：机架和四个轧辊（13）；四个轧辊设置在机架内，分布在方矩形管的四角，每个轧辊上设置有轧辊移动控制旋钮（12），控制轧辊同时进行横向、纵向及成形方向的移动；机架上设置有机架旋转控制按钮（14），控制机架旋转；精成形机组设置有测温仪及自动反馈装置（5）。该系统不但能降低材料成形力，提高材料的成形性能；还可消除由于加工硬化而产生的残余应力以及可能造成的开裂现象，得到的方矩管角部轮廓致密，内外角半径很小，角部角度接近90°，并伴随着角部的增厚。

Description

一种角部增厚的冷热复合成形方矩形管成型系统 技术领域
本发明涉及金属材料成型设备技术领域，进一步地说，是涉及一种角部增厚的冷热复合成形方矩形管成型系统。
背景技术
钢结构材料被誉为21世纪的“绿色建筑”之一，而方矩形钢管是钢结构中最佳的立柱材料，传统的冷弯成形方矩管由于冷弯成形过程的二次加工硬化效应，使方矩管角部具有很大的残余应力，直接导致其延展性的降低，同时可能带来使用过程中的开裂，极大的限制了方矩管的使用范围，一般不能用在高层建筑中做主要的材料，现在高层建筑中使用的方矩管都是由4片钢板焊接成的方矩管，具有很大的局限性；同时冷弯方矩管的角部半径很大，焊接性能很差，必须使用角部增料等方式来提高其焊接性能，但这样会加大制造成本。
传统的冷弯方矩管成型设备生产的方矩管角部性能较差，角部有残余应力存在且延伸性降低，易发生断裂。
发明内容
为解决传统冷弯方矩管角部的缺陷，本发明提出一种角部增厚的冷热复合成形方矩形管成型系统。在传统的辊弯成形工艺中引入热成形技术，即局部感应加热技术。高温不但能降低材料成形力，提高材料的成形性能；同时可消除由于加工硬化而产生的残余应力以及可能造成的开裂现象，并且经过冷热复合成形的方矩管角部轮廓致密，内外角半径很小，角部角度接近90°，并伴随着角部的增厚。
本发明的目的是提出一种角部增厚的冷热复合成形方矩形管成型系统。
包括：
依次连接的上料装置、辊压导入机组、局部感应加热装置、精成形机组、水冷装置、空冷区和切割装置；
精成形机组包括：机架和四个轧辊；
四个轧辊设置在机架内，分布在方矩形管的四角，每个轧辊上设置有轧辊移动控制旋钮，控制轧辊同时进行横向、纵向及成形方向的移动；
机架上设置有机架旋转控制按钮，控制机架旋转；
精成形机组设置有测温仪及自动反馈装置。
其中，优选：
所述局部感应加热装置设置有感应线圈，感应线圈对应方矩形管的四角位置外包一层硅钢片，对方矩形管四角进行加热。
所述精成形机组的数量为N，N为大于1的奇数；两台精成形机组之间设置有保温装置。第单数架精成形机组固定不动；第偶数架精成形机组可进行旋转。以成型系统的轴线为轴进行顺时针或逆时针旋转。
综合考虑到成本和效果，优选精成形机组的数量为五台；
第1，3，5架精成形机组固定不动；第2，4架精成形机组可进行转动，以成型系统的轴线为轴进行顺时针或逆时针旋转。
第2，4架精成形机组转动角度均为0-3°。
第2，4架精成形机组通过涡轮蜗杆装置进行旋转。
每前后两个相邻的精成形机组的辊径差取1～5mm。
所述保温装置为火焰喷枪保温装置
本发明具体可采用以下技术方案：
包括：
1、上料装置：将预成品方矩形钢管上料至生产系统中；
2、辊压导入机组两架：经过两个道次的辊压导入系统，将方矩管平稳对称 的导入到后续的生产系统中。
3、局部感应加热装置：本系统中，通过感应线圈对应方矩管的四角位置外部包一层硅钢片，利用硅钢片的驱磁导磁作用，引导电磁线的局部分布，从而实现对大圆角半径方矩管四角进行局部加热，同时通过测温仪及自动反馈系统保证加热温度的精准和稳定，加热温度范围是：750℃～1100℃，根据钢种的种类和加热频率来确定加热的时间。
4、精成形机组：5架精成形机组在一起形成了热精整和矫直过程，精成形阶段温度控制在700-950℃之间，经过每个精成形机组，方矩形管的横截面积的变形程度在0-5％范围。5个道次的精成形机组，其中的第1、第3和第5架机组是固定不动的，第2和第4架机组通过涡轮蜗杆装置可以进行旋转。第2和第4架机组可以对方矩管进行相反方向的扭转，角度为0-3°，保证方矩管的平直度，同时，5架精成形机组的速度不同，后一道次的机架会比前一个的速度快一点，因此在各个道次间会产生张力，在张力和第2和第4架机组的共同作用下，对方矩管实现整形和矫直功能，消除热精整过程中产生的扭曲、翘曲等冗余变形。)
5、测温仪及自动反馈系统五个
每一个精成形机架都设有一个测温仪及自动反馈系统，对成形的方矩管温度进行检测与反馈，保证方矩管在加热过程中的恒温。
6、火焰喷枪保温系统四个
精成形机组中，每相邻的两个机架间设置一个，保证管材的恒温，温度控制在700-950℃。
7、水冷装置
通过水冷系统对方矩管进行控冷，保证成品方矩管的强度性能。终冷温度设置在350℃左右，冷却的速度根据不同的钢种和性能需求进行控制。
8、空冷区
水冷后的方矩管会随室温逐渐冷却。
9、切割装置
对成品方矩形管进行横向切割，并按照实际需求的长度进行切割。
本发明的一种角部增厚的冷热复合成形方矩形管成型系统，集辊弯成形和热成形的优点于一身。主要解决冷弯方矩管角部减薄，大半径和残余应力等问题，通过角部增厚矩形管的工艺研究，诠释热辊弯工艺对于角部增厚矩形管的可行性。
本发明的角部增厚的冷热复合成形方矩形管成型系统，属于局部加热辊弯成形设备领域，用于解决方矩管冷弯成形角部减薄的问题。成型涉及到的方矩管是无水的，且装置本身属于二次成型装置。所述的传入机组依次设至少2道次机架，使一次成形方矩管平稳对称的进入后面的设备，感应加热使用特定的加热线圈对其加热，二次精成形机组包含5个道次，起到整形和矫直作用，同时穿插进火焰喷枪保温装置，防止方矩管温度降低，最后利用水冷装置对成形后的方矩管进行淬火，保证成品的强度性能。
本发明通过感应加热的矩形管达到一定温度后，四个圆角部位塑性性能提高，而其它母材强度不受影响。进入精整工序，在四向挤压应力的作用及感应加热集肤效应影响下，方矩管外侧金属向内侧流动受阻，迫使其向方管外角区域流动，实现了角部增厚，圆角半径减小，同时达到产品尺寸精度。
本发明的局部感应加热系统中，通过该发明自制的感应加热系统，能够实现避开母材平面区域条件下，均匀准确同时的加热矩形管的四个弯角部位。还配置了自动反馈温度调节系统，该系统通过温度测量仪，捕捉成形前的温度反馈给感应加热系统，若测得温度在成形温度区间内，则保持当前功率；若不在，则迅速升高或降低功率来调节适合的成形温度，从而保证加热温度的恒定。
现有技术的精成形机组的轧辊轧机是对方矩管的四个边的板平面进行辊压，且轧辊不能进行移动，因此，生产的方矩管的边长有多大，轧辊就需要有多大，这大大的限制了大尺寸规格的方矩管的生产，一套设备只能生产一种规格的产品。而本发明的精成形机组的轧辊分布在方矩管的四个角部，直接对方 矩管的四个外角进行辊压成形，且4个角部的轧辊可以同时进行横向、纵向以及成形方向(斜向)的移动，来适用不同尺寸规模的方矩管的成形。因此，本发明的系统制备的方矩管的成形的尺寸范围相比现有技术大大提升，最多可以生产周长80mm-9600mm，壁厚6mm-80mm的方矩形钢管。并且，本发明是对方矩管的角部进行辊压成形，不用更换轧辊，可以用一套设备生产所有规格的产品，大大的降低了生产的成本。
本发明优选5个精成形机组，其中第1，3，5架精成形机组是固定不动的，确保方矩管在成型过程中行进方向和成形方向的稳定性，其中的第2、4架机组可以进行旋转，可以对成型过程中出现的扭曲、翘曲等冗余变形进行即时的矫直和修正，消除各种缺陷，使得到的方矩管产品的外形精度和性能质量大大提高。同时因为精成形机组共有5架，可以更大程度范围的改变方矩管的角部形状，使其更接近于直角，角部壁厚增加的更明显，这使得方矩管的截面性能提升，力学性能和焊接性能等变得更好，同时可生产方矩管的壁厚尺寸范围也变得更大。
除了第一架精成形机组，之后的精成形机组每个前面都有一个保温装置来确保方矩管在整个的精成形过程中温度的恒定，方矩管的成形温度恒定，变形更容易，方矩管的角部可以有能力且更容易的变成直角，角部壁厚额增加也变得水到渠成，其可以生产的方矩管的尺寸规模也变得更大，同时得到的方矩管的性能条件会更好。
本发明与现有的技术相比，所具有的优势在于：
(1)与传统辊弯成形设备相比，一种角部增厚的冷热复合成形方矩形管成型系统增加了感应加热设备及保温设备，二次成型过程在高温条件下进行，极大改善了方矩管角部性能，减小残余应力，防止加工硬化，在保证原材料强度情况下对母材基本没有影响，同时成形过程对设备的磨损变小，水冷装置的加入可以确保方矩管的力学性能。
(2)本装置覆盖所有钢种的生产，同时生产的规模范围广，为周长 80mm-9600mm，壁厚6mm-80mm。
附图说明
图1本发明提供的一种角部增厚矩形管成型系统示意图；
图2本发明的精成形机组转动示意图；
图3本发明的精成形机组结构示意图；
图4现有技术的精成形机组的辊压示意图；
图5本发明的精成形机组的辊压示意图；
图6本发明的局部感应加热装置示意图。
附图标记说明：
1、上料装置；2、辊压导入机组；3、局部感应加热装置；4、精成形机组；5、测温仪及自动反馈系统；6、火焰喷枪保温装置；7、水冷装置；8、空冷区；9、切割装置；11、预成形方矩管；12、轧辊移动控制旋钮；13、轧辊；14、机架旋转控制旋钮；15硅钢片；16感应加热线圈。
具体实施方式
实施例
一种角部增厚的冷热复合成形方矩形管成型系统，包括：依次连接的上料装置1、辊压导入机组2、局部感应加热装置3、精成形机组4、水冷装置7、空冷区8和切割装置9；
精成形机组4包括：机架和四个轧辊13；
四个轧辊13设置在机架内，分布在方矩形管的四角，每个轧辊上设置有轧辊移动控制旋钮12，控制轧辊同时进行横向、纵向及成形方向的移动；
机架上设置有机架旋转控制按钮14，控制机架旋转；
精成形机组4设置有测温仪及自动反馈装置5。
所述局部感应加热装置2设置有感应线圈16，感应线圈对应方矩形管的四 角位置外包一层硅钢片15，对方矩形管四角进行加热。
所述精成形机组为五台，两台精成形机组之间设置有保温装置。第1，3，5架精成形机组固定不动；第2，4架精成形机组可以进行转动，第2，4架精成形机组可进行旋转。本实施例的热精整辊压轧制过程中，方矩管未发生扭曲等缺陷，所以第2，4架精成形机组转动角度均为0°所述保温装置为火焰喷枪保温装置6。
成型方法包括：
(1)将Q235钢板预弯成外圆角半径R＝20.0mm的预成形方矩管，尺寸为200*200mm，其中平板区域壁厚为8.0mm，角部壁厚为7.8mm。
(2)将预成形方矩管进过导辊送入局部感应加热装置，加热温度为1050℃，加热时间为15秒；
(3)之后经过五台精成形机组成形，每两架成形机组间的火焰喷枪保温系统温度为950℃，每相邻的两架精成形机组间的辊径差取值为3mm，每架精成形机组的变形程度在3％左右。
(4)经过热精整后，获得尺寸为193*193mm，平板区域壁厚为8mm，角部壁厚为8.8mm，外圆角半径为2mm的矩形管，经质量检测，该冷热复合成形方矩管残余应力消除，加工硬化消除，塑性能力得到加强。

Claims (9)

  1. 一种角部增厚的冷热复合成形方矩形管成型系统，其特征在于：
    所述系统包括依次连接的上料装置、辊压导入机组、局部感应加热装置、精成形机组、水冷装置、空冷区和切割装置；
    精成形机组包括：机架和四个轧辊；
    四个轧辊设置在机架内，分布在方矩形管的四角，每个轧辊上设置有轧辊移动控制旋钮，控制轧辊同时进行横向、纵向及成形方向的移动；
    机架上设置有机架旋转控制按钮，控制机架旋转；
    精成形机组设置有测温仪及自动反馈装置。
  2. 如权利要求1所述的角部增厚的冷热复合成形方矩形管成型系统，其特征在于：
    所述局部感应加热装置设置有感应线圈，感应线圈对应方矩形管的四角位置外包一层硅钢片，对方矩形管四角进行加热。
  3. 如权利要求1所述的角部增厚的冷热复合成形方矩形管成型系统，其特征在于：
    所述精成形机组的数量为N，N为大于1的奇数；两台精成形机组之间设置有保温装置；
    第单数架精成形机组固定不动；第偶数架精成形机组可进行旋转。
  4. 如权利要求3所述的角部增厚的冷热复合成形方矩形管成型系统，其特征在于：
    所述精成形机组的数量为五台。
  5. 如权利要求4所述的角部增厚的冷热复合成形方矩形管成型系统，其特征在于：
    第1，3，5架精成形机组固定不动；第2，4架精成形机组可进行旋转。
  6. 如权利要求5所述的角部增厚的冷热复合成形方矩形管成型系统，其特征 在于：
    第2，4架精成形机组旋转角度均为0-3°。
  7. 如权利要求5所述的角部增厚的冷热复合成形方矩形管成型系统，其特征在于：
    第2，4架精成形机组通过涡轮蜗杆装置进行旋转。
  8. 如权利要求3所述的角部增厚的冷热复合成形方矩形管成型系统，其特征在于：
    每前后两个相邻的精成形机组的辊径差取1～5mm。
  9. 如权利要求3所述的角部增厚的冷热复合成形方矩形管成型系统，其特征在于：
    所述保温装置为火焰喷枪保温装置。
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