Pulse current assisted two-high hot rolling mill

Abstract

The present application relates to a kind of pulse current auxiliary two-roller hot rolling mill, belong to metal material processing forming equipment technical field.The technical scheme of the present application is: the main body of rack (2) is two-roller mill, slide rail (7) is fixed on rack (2) by positioning screw (3), two self-cooled brushes (5) are connected with the front and rear sides of rack (2) by slide rail (7) respectively, and the positive and negative poles of high-density electric pulse (1) power are connected on the two self-cooled brushes (5) respectively.The beneficial effects of the present application are: improving metal hot rolling temperature and increasing the ductility of metal, thereby improving metal plastic deformation, and improving the processing performance of metal;Surface quality is improved, residual stress is reduced and organization is homogenized, with the advantages of fast, efficient, obvious effect gain, low cost, simple operation and the like.

Description

Technical Field

[0001] The invention relates to a pulse current assisted two-roller hot rolling mill, belonging to the technical field of metal material processing and forming equipment. Background Art

[0002] In modern metal hot rolling processes, the technique of passing high-density DC pulses through the ends of the metal has become a significant innovation in traditional heat treatment methods. This technique operates by leveraging the local Joule heating and electroplastic effects of the current. Through local Joule heating, the high-density pulses rapidly heat the metal, raising the overall hot rolling temperature and thereby increasing its plasticity and ductility. This localized temperature increase improves the metal's plastic deformation capacity, thereby enhancing its processability. The electroplastic effect, acting at the microscopic level, alters the material's microstructure, optimizing grain size and distribution, thereby enhancing its overall mechanical properties. This technique not only improves surface quality but also effectively reduces residual stress and achieves uniform microstructure through uniform heating with high-density pulses. Devices employing this technique are simple to operate and offer rapid performance adjustments, significantly improving product performance without significantly increasing costs. This method is not only highly efficient and offers significant gains, but also significantly reduces costs by reducing energy consumption and raw material loss. In summary, the application of DC high-density pulse current in the field of metal hot rolling has demonstrated its outstanding technical advantages and broad development prospects. Summary of the Invention

[0003] The purpose of the present invention is to provide a pulse current assisted two-roll hot rolling mill. By adding a pulse current power supply device on the basis of the two-roll rolling mill, high-density pulse current is passed into the metal during hot rolling. Compared with single hot rolling, the local Joule heating effect and electroplastic effect of the current are used to increase the hot rolling temperature of the metal and increase the ductility of the metal, thereby improving the plastic deformation of the metal and enhancing the processing performance of the metal; high-density pulse current can also be used to improve the surface quality, reduce residual stress and homogenize the structure. It has the advantages of being fast, efficient, with obvious effect gain, low cost and simple operation, and effectively solves the above-mentioned problems existing in the background technology.

[0004] The technical solution of the present invention is: a pulse current assisted two-roll hot rolling mill, comprising a frame, a slide rail, a high-density electric pulse power supply and a self-cooling brush. The frame body is a two-roll rolling mill, the slide rail is fixed to the frame by positioning screws, there are two self-cooling brushes, which are respectively connected to the front and rear sides of the frame through the slide rail, and the positive and negative poles of the high-density electric pulse power supply are respectively connected to the two front and rear self-cooling brushes.

[0005] The self-cooling brush mechanism includes a liquid-cooled radiator, a copper heat-conducting fixture, a conductive isolation gasket, a thin copper sheet and a fastening bolt. The liquid-cooled radiator is fixed on the copper heat-conducting fixture, and the thin copper sheet and the conductive isolation gasket are placed alternately and fixed by the fastening bolts.

[0006] There are two groups of slide rails, which are respectively located at the front and rear sides of the roller and fixed to the two sides of the frame by positioning screws.

[0007] The utility model also comprises a sliding sleeve, which is sleeved on the sliding rail and has a limiting hole, and the number of the limiting holes is more than one.

[0008] The beneficial effects of the present invention are as follows: by adding a pulse current power supply device on the basis of a two-roll rolling mill, a high-density pulse current is supplied to the metal during hot rolling. Compared with single hot rolling, the local Joule heating effect and electroplastic effect of the current increase the hot rolling temperature of the metal and increase the ductility of the metal, thereby improving the plastic deformation of the metal and enhancing the processing performance of the metal; the high-density pulse current can also be used to improve the surface quality, reduce residual stress and homogenize the structure, with the advantages of being fast, efficient, with obvious effect gain, low cost and simple operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a front view of the present invention;

[0010] Figure 2 is a side view of the present invention;

[0011] Figure 3 It is a structural schematic diagram of the liquid cooling radiator of the present invention;

[0012] Figure 4 This is a diagram of the main body of the self-cooling brush of the present invention;

[0013] Figure 5 This is a cross-sectional view of the self-cooling brush of the present invention;

[0014] In the figure: high-density electric pulse power supply 1, frame 2, positioning screw 3, sliding sleeve 4, self-cooling brush 5, slide rail 7, liquid cooling radiator 8, copper thermal conductive fixture 9, conductive isolation gasket 10, thin copper sheet 11, fastening bolt 12. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the invention implementation cases clearer, the technical solutions in the invention implementation cases will be clearly and completely described below in conjunction with the drawings in the implementation cases. Obviously, the implementation cases described are only a small part of the implementation cases of the present invention, rather than all the implementation cases. Based on the implementation cases in the present invention, all other implementation cases obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0016] A pulse current assisted two-roll hot rolling mill includes a frame 2, a slide rail 7, a high-density electric pulse power supply 1 and a self-cooling brush 5. The main body of the frame 2 is a two-roll rolling mill. The slide rail 7 is fixed to the frame 2 by a positioning screw 3. There are two self-cooling brushes 5, which are respectively connected to the front and rear sides of the frame 2 through the slide rail 7. The positive and negative poles of the high-density electric pulse 1 power supply are respectively connected to the front and rear two self-cooling brushes 5.

[0017] The self-cooling brush mechanism includes a liquid-cooled radiator 8, a copper thermal conductive fixture 9, a conductive isolation gasket 10, a thin copper sheet 11 and a fastening bolt 12. The liquid-cooled radiator 8 is fixed on the copper thermal conductive fixture 9, and the thin copper sheet 11 and the conductive isolation gasket 10 are placed alternately and fixed by the fastening bolt 12.

[0018] There are two groups of slide rails 7, which are respectively located at the front and rear sides of the roller and fixed to both sides of the frame 2 by positioning screws 3.

[0019] It also includes a sliding sleeve 4, which is sleeved on the sliding rail 7. The sliding sleeve 4 is provided with a limiting hole, and the number of the limiting holes is more than one.

[0020] In practice, eight positioning holes matching the slide rails 7 are provided on each of the left and right sides of the frame 2, distributed in the front and rear positions. The two sets of slide rails 7 on the left and right sides are fixed with positioning screws 3. The sliding sleeve 4 matches the size of the slide rails 7, allowing it to slide freely up and down along the slide rails 7. It is provided with a set of positioning holes, which can be fixed with screws in the appropriate position.

[0021] In the main body, two self-cooling brushes 5, front and rear, slide vertically via a sliding sleeve 4 connected to a slide rail 7. Each brush 5 consists of a liquid-cooled heat sink 8, a copper heat-conducting retainer 9, a conductive isolation pad 10, and a thin copper sheet 11. These components are each provided with four corresponding positioning holes for secure fixation via four fastening bolts 12. Example

[0022] Nickel-based alloy GH4169 with a cross-sectional size of 25 cm × 100 cm and a length of 8 m was subjected to pulse current assisted two-roll hot rolling and rolled into a plate with a thickness of 18 cm in one pass.

[0023] First, adjust the front self-cooling brush 5 to be flush with the upper roller by adjusting the sleeve 4. Then, tighten the set screws on the sleeve 4 to secure it. Repeat the same process to align the rear self-cooling brush 5 with the lower roller. Turn on the liquid cooling radiator 8 on the self-cooling brush 5. Then, turn on the high-density pulse power supply 1 and calculate and adjust the current using the following formula.

[0024]

[0025] Where J is the current density in A / cm², and ρ is the resistivity in 10 -8 ·Ω·cm, K is thermal conductivity, unit is W / (cm·K).

[0026] The alloy material is heated to 900°C and placed in a transmission device for electric pulse assisted hot rolling. After the hot rolling process is completed, the high-density pulse power supply 1, the liquid cooling radiator 8, and finally the hot rolling mill are turned off in sequence to complete the entire rolling process.

[0027] This method increases the hot-rolling temperature and ductility of metals, thereby improving plastic deformation and enhancing their processing properties. It also utilizes high-density pulsed current to improve surface quality, reduce residual stress, and homogenize the structure. This method offers the advantages of rapidity, high efficiency, significant gains, low cost, and simple operation.

Claims

1. A pulse current assisted two-roll hot rolling mill, characterized in that: It comprises a frame (2), a slide rail (7), a high-density electric pulse power supply (1) and a self-cooling brush (5), wherein the main body of the frame (2) is a two-roll rolling mill, the slide rail (7) is fixed to the frame (2) by a positioning screw (3), there are two self-cooling brushes (5), which are respectively connected to the front and rear sides of the frame (2) through the slide rail (7), and the positive and negative poles of the high-density electric pulse (1) power supply are respectively connected to the front and rear two self-cooling brushes (5); The self-cooling brush comprises a liquid cooling radiator (8), a copper heat conducting fixture (9), a conductive isolation gasket (10), a thin copper sheet (11) and a fastening bolt (12); the liquid cooling radiator (8) is fixed on the copper heat conducting fixture (9); the thin copper sheet (11) and the conductive isolation gasket (10) are alternately arranged and fixed by the fastening bolt (12).

2. The pulse current assisted two-roll hot rolling mill according to claim 1, characterized in that: There are two groups of slide rails (7), which are respectively located on the front and rear sides of the roller and are fixed to both sides of the frame (2) by positioning screws (3).

3. The pulse current assisted two-roll hot rolling mill according to claim 1, characterized in that: It also includes a sliding sleeve (4), which is sleeved on the sliding rail (7). The sliding sleeve (4) is provided with a limiting hole, and the number of the limiting holes is more than one.

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