CN111250566A

CN111250566A - Stretching straightening machine

Info

Publication number: CN111250566A
Application number: CN201811457457.XA
Authority: CN
Inventors: 朱健桦; 徐世伟; 唐伟能; 谢玉
Original assignee: Baoshan Iron and Steel Co Ltd
Current assignee: Baoshan Iron and Steel Co Ltd
Priority date: 2018-11-30
Filing date: 2018-11-30
Publication date: 2020-06-09

Abstract

The invention discloses a stretching straightener which is used for stretching and straightening various sectional materials such as steel materials, aluminum materials, particularly magnesium alloys and the like and comprises a frame, a stretching oil cylinder, a movable trolley and a fixed frame, wherein the cylinder body of the stretching oil cylinder is fixed on the frame, the piston rod of the stretching oil cylinder is connected with one end of the movable trolley, one end of the sectional material is connected with the other end of the movable trolley, the other end of the sectional material is connected with the fixed frame, a heating cover for uniformly heating the sectional material is arranged between the movable trolley and the fixed frame, the heating cover is covered on the sectional material, and the heating cover can stretch along the length direction of the heating cover. The stretching straightener can apply accurate stretching force to the magnesium alloy and other sectional materials which are extremely sensitive to temperature under the working condition of uniformly heating the sectional materials, and the stretching straightening effect is ensured.

Description

Stretching straightening machine

Technical Field

The invention relates to a stretching straightener, in particular to a stretching straightener for stretching magnesium alloy sections.

Background

The straightening of the profile is generally performed by tension straightening by a stretching straightener, but the magnesium alloy material has poor deformability at normal temperature, and when the original bending of the profile is larger, the profile is easy to break if the stretching straightening at room temperature is performed, so the stretching straightening can be performed only by heating the magnesium alloy material to a certain temperature.

At present, the stretch straightening of magnesium alloys is divided into two categories: the magnesium alloy is firstly put into a heating furnace to be heated to a preset temperature and then transferred to a stretching straightener to be stretched and straightened, and the magnesium alloy has the problems that the temperature of the magnesium alloy is reduced very quickly in the process of being transferred to the stretching straightener after being taken out from the heating furnace, the heating temperature of the heating furnace has to be increased, the energy consumption is increased, the production cost is increased, and the thermal stress is easy to generate to influence the performance of the section. The other type is that magnesium alloy is directly heated and straightened on line on a stretching straightening machine, but the heating mode adopted at present can cause different parts of the section bar to be heated unevenly, so that the temperature and the plasticity of different parts are different, the tensile strength is different, and the stretching straightening effect is seriously influenced.

In order to solve the problems in the prior art, the provision of a new stretching straightener is of great significance.

Disclosure of Invention

In order to solve the problems, the invention provides a stretching straightener which can apply accurate stretching force to a profile under the working condition of realizing uniform heating of the profile, and ensure the stretching straightening effect.

In order to achieve the purpose, the stretching straightening machine is used for stretching and straightening sectional materials and comprises a rack, a stretching oil cylinder, a movable trolley and a fixed frame, wherein a cylinder body of the stretching oil cylinder is fixed on the rack, a piston rod of the stretching oil cylinder is connected with one end of the movable trolley, one end of the sectional material is connected with the other end of the movable trolley, the other end of the sectional material is connected with the fixed frame, a heating cover used for uniformly heating the sectional material is arranged between the movable trolley and the fixed frame, the heating cover is covered on the sectional material and can stretch along the length direction of the heating cover, and the sectional materials with different lengths are ensured to be always positioned in the heating cover to form a heating space.

Preferably, the heating device further comprises a blower, an air inlet for the blower to blow hot air into the heating cover is formed in one end, close to the fixing frame, of the heating cover, and an air outlet is formed in one end, close to the moving trolley, of the heating cover.

Preferably, a force sensor for measuring the tensile force of the stretching oil cylinder is arranged at the joint of the piston rod of the stretching oil cylinder and the movable trolley.

Furthermore, the force sensor is an axle pin type weighing sensor, and a piston rod of the stretching oil cylinder is hinged with the movable trolley through the force sensor.

Preferably, the heating cover is in a corrugated hose shape, one end of the heating cover is connected with the moving trolley, and the other end of the heating cover is connected with the fixing frame.

Preferably, the movable trolley and the fixed frame are respectively provided with a chuck for clamping the end part of the section bar.

The stretching straightener provided by the invention has the advantages that the heating cover is arranged, the air blower is adopted to heat the section, the structure is simple, the energy consumption is low, the production cost is low, and the defect that the section is not uniformly heated in the prior art can be avoided. Furthermore, the tension of the tension straightening machine is accurately measured and controlled by adopting a force sensor, so that the tension straightening effect of the section with low temperature plasticity and tensile strength can be ensured.

Drawings

FIG. 1 is a schematic view showing the structure of a stretch leveler of the present invention.

Detailed Description

The structure, operation, and the like of the present invention will be further described with reference to the accompanying drawings.

Referring to fig. 1, the stretching and straightening machine of the present invention is used for stretching and straightening a profile 1, and the stretching and straightening machine includes a frame 8, a stretching oil cylinder, a moving trolley 4 and a fixed frame 2, wherein a cylinder body 7 of the stretching oil cylinder is fixed on the frame 8, a piston rod 6 of the stretching oil cylinder is connected with one end of the moving trolley 4, one end of the profile 1 is connected with the other end of the moving trolley 4, the other end of the profile 1 is connected with the fixed frame 2, wherein the moving trolley 4 and the fixed frame 2 can be arranged on the frame 8, and the fixed frame 2 can be fixed on the frame 8. Preferably, the mobile trolley 4 and the fixed frame 2 are provided with

gripping heads

21, 41 for gripping the end of the section bar 1. The stretching straightener drives the movable trolley 4 to move towards the direction far away from the fixed frame 2 by retracting the piston rod 6 of the stretching oil cylinder, thereby stretching and straightening the section bar 1.

Be equipped with the heating mantle 3 that is used for evenly heating to section bar 1 between travelling car 4 and the mount 2, the heating mantle 3 covers and locates on section bar 1, and the heating mantle 3 can stretch out and draw back along its length direction, ensures that the section bar 1 of different length is in heating mantle 3 all the time, forms a heating space. Can be to 1 even heating's of section bar heating mantle 3 through the setting, can avoid section bar 1 to be heated unevenly, specifically, the accessible air-blower is to heating mantle 3 interior drum go into hot-blastly in order to heat section bar 1, the one end that heating mantle 3 is close to mount 2 is equipped with and supplies the air-blower to go into hot-blastly air intake (not shown in the figure) to heating mantle 3 drum, the one end that heating mantle 3 is close to travelling car 4 is equipped with air outlet (not shown in the figure), make hot-blastly get into from the air intake, discharge by the air outlet again behind hot-blast through whole section bar 1, can realize 1 ground. The heating cover 3 can stretch out and draw back along the length direction, and can realize that the heating cover 3 extends along with the movement of the movable trolley 4, preferably, the heating cover 3 can be in a threaded hose shape, one end of the heating cover 3 is connected with the movable trolley 4, and the other end is connected with the fixed frame 2, so that a heating space for uniformly heating the section bar 1 is formed. It is to be appreciated that the heating mantle 3 may also be of a construction similar to a machine guide rail mantle, for example an organ mantle.

The section bar 1 may have various shapes in cross section, and the material thereof may be a metal material such as magnesium alloy, steel, or aluminum. Of course, the stretch-straightening machine of the invention can also be applied to bars, tubes, etc.

The stretching straightener in the prior art indirectly calculates the stretching force by monitoring the oil pressure of the stretching oil cylinder, the factors such as the sealing damping of the oil cylinder, whether the oil cylinder leaks or not and the like are not considered, so that the measurement and the control of the stretching force are relatively extensive, the tensile strength of the magnesium alloy material is lower than that of steel and aluminum, particularly, after the magnesium alloy material is heated to a certain temperature, the temperature plasticity and the tensile strength are lower, and the stretching force of the magnesium alloy is required to be accurately controlled to ensure the stretching effect.

In order to accurately measure and control the stretching force, a force sensor 5 for measuring the stretching force of the stretching oil cylinder is arranged at the joint of the piston rod 6 of the stretching oil cylinder and the movable trolley 4. The force sensor 5 can be a plane type pressure sensor, preferably, the force sensor 5 can also be an axle pin type weighing sensor, a piston rod 6 of the stretching oil cylinder is hinged with the movable trolley 4 through the force sensor 5, and the stretching force of the stretching straightener can be accurately measured and controlled while the connecting function of the stretching oil cylinder is realized.

The stretching straightener provided by the invention has the advantages that the heating cover 3 is arranged, the section bar 1 is heated by the air blower to the optimum temperature for stretching and straightening, the optimum straightening effect is achieved, the structure is simple, the energy consumption is low, the production cost is low, the defect that the section bar 1 is unevenly heated in the prior art can be avoided, and the stretching straightener is particularly suitable for materials such as magnesium alloy which cannot be stretched and straightened at normal temperature. Further, the tension of the stretch straightener is accurately measured and controlled by the force sensor 5, so that the stretch straightening effect of the section 1 with low temperature plasticity and tensile strength can be ensured.

The foregoing is merely illustrative of the present invention, and it will be appreciated by those skilled in the art that various modifications may be made without departing from the principles of the invention, and the scope of the invention is to be determined accordingly.

Claims

1. The utility model provides a stretching straightener for carry out stretching straightening to the section bar, its characterized in that, including frame, stretching cylinder, travelling car and mount, stretching cylinder's cylinder body is fixed in the frame, stretching cylinder's piston rod with travelling car's one end is connected, the one end of section bar with travelling car's the other end is connected, the other end of section bar with the mount is connected, be equipped with between travelling car and the mount and be used for right the heating mantle of section bar even heating, the heating mantle cover is located on the section bar, just the heating mantle can stretch out and draw back along its length direction.

2. The stretch straightener in accordance with claim 1, further comprising a blower, wherein an air inlet for blowing hot air into the heating mantle by the blower is provided at an end of the heating mantle near the fixed frame, and an air outlet is provided at an end of the heating mantle near the moving carriage.

3. The stretch leveler as in claim 1, wherein a force sensor for measuring the tension force of the stretch cylinder is provided at a connection of the piston rod of the stretch cylinder and the traveling carriage.

4. The stretch straightener in claim 3, wherein the force sensor is an axle pin type weighing sensor, and a piston rod of the stretching cylinder is hinged with the moving trolley through the force sensor.

5. The stretch leveler as set forth in claim 1, wherein said heating mantle is formed in a bellows shape, one end of said heating mantle being connected to said traveling carriage, and the other end thereof being connected to said fixed frame.

6. The stretch leveler as set forth in claim 1, wherein said traveling carriage and said fixed frame are provided with chucks for gripping said ends of said profiles.