Magnesium alloy extruding and rolling integrated forming device

Abstract

The utility model discloses a magnesium alloy extruding and rolling integrated forming device, and belongs to the technical field of magnesium alloy plate forming. Wherein the rolling and bending device is arranged behind a discharge hole of the extrusion device and is used for carrying out online rolling and bending on a magnesium alloy plate extruded and sent out from the extrusion device; the rolling and bending device comprises a one-time forming upper roller, a one-time forming lower roller, a multi-time forming upper roller, a multi-time forming lower roller, a shaping upper roller and a shaping lower roller which are the same in structure and jointly form a multi-pass rolling and forming system, the multi-pass rolling and forming system is used for achieving final bending of a plate through multi-pass small deformation, and springback or cracking caused by one-time forming is avoided. According to the device, on-line bending forming of the magnesium alloy plate is achieved, the plate does not need to be reheated, bending equipment with higher strength does not need to be provided, and on-line bending of the magnesium alloy plate can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of magnesium alloy plate forming, in particular to a magnesium alloy extrusion rolling integrated forming device. Background Art

[0002] Magnesium alloy has the advantages of high specific strength and specific stiffness, good thermal conductivity and electrical conductivity, damping and shock absorption, electromagnetic shielding, easy processing and forming, and easy recycling. It has extremely important application value and broad application prospects in the fields of automobiles, electronic communications, aerospace, national defense and military, and is known as the "21st century green engineering material". The density of magnesium alloy is small (about 1.8g / cm³), which is 23% of steel, 67% of aluminum, and 170% of plastic. It is the lightest metal among metal structural materials. The yield strength of magnesium alloy is roughly the same as that of aluminum alloy, only slightly lower than carbon steel, and 4 to 5 times that of plastic. Its elastic modulus is much higher than that of plastic, which is more than 20 times. Compared with aluminum alloy, steel and iron, magnesium alloy has a lower elastic modulus. Under the same stress conditions, it can consume more deformation work, has noise reduction and vibration reduction functions, and can withstand large impact and vibration loads. In addition, magnesium alloy also has good corrosion resistance, electromagnetic shielding performance and radiation protection performance, and can be 100% recycled and reused.

[0003] Due to its HCP structure, magnesium alloys are not as good at forming as aluminum alloys. Magnesium alloys can be bent using a die on a punch press or a special bending machine, or using a rubber sheet. Bending, like other stamping processes, is the result of the punching force acting on the blank. At the beginning, the external force acting on the blank causes elastic deformation of the material; then the force gradually increases, and when it reaches the maximum value, the blank is plastically deformed. After the external force is removed, the deformed blank cannot return to its original shape, but takes on the shape of the die.

[0004] At present, the bending process of materials can be divided into two categories according to the temperature: cold processing and hot processing. Cold processing refers to the forming process performed at room temperature. For materials with high plasticity and good forming performance at room temperature, cold processing is used. Hot processing refers to the forming process performed at a temperature higher than room temperature. For materials with low plasticity and poor forming performance at room temperature, hot processing is used. Although cold processing does not require heating of materials or equipment, most materials at room temperature have higher deformation resistance than at high temperature. Therefore, the equipment selected for cold processing often requires greater power, higher performance and extremely strong stability.

[0005] Although hot processing has lower power and performance requirements for equipment than cold processing, the need to heat the material brings about a series of problems such as increased equipment, complicated procedures, and energy consumption.

[0006] The magnesium alloy forming process currently uses magnesium alloy extruded plates, which are formed by hot working. However, magnesium alloy extruded plates often have defects such as cracks and breaks when subjected to large deformation in a single pass, resulting in a decrease in product quality. Utility Model Content

[0007] The utility model overcomes the shortcomings of the prior art and proposes a magnesium alloy extrusion rolling integrated forming device to achieve continuous multi-pass forming and solve the problems of edge cracking and breaking of magnesium alloy extruded plates during deformation.

[0008] In order to achieve the above purpose, the utility model is implemented through the following technical solutions.

[0009] A magnesium alloy extrusion and rolling integrated forming device comprises an extrusion device, a rolling and bending device and a traction device which are arranged in sequence; the rolling and bending device is arranged behind the discharge port of the extrusion device, and is used for online rolling and bending the magnesium alloy sheet extruded and sent out from the extrusion device; the rolling and bending device comprises a primary forming upper roller, a primary forming lower roller, a multiple forming upper roller, a multiple forming lower roller, a shaping upper roller and a shaping lower roller of the same structure; the primary forming upper roller, the primary forming lower roller, the multiple forming upper roller, the multiple forming lower roller, the shaping upper roller and the shaping lower roller are all gear structures; the primary forming upper roller, the multiple forming upper roller and the shaping upper roller are arranged in sequence above the magnesium alloy sheet from the extrusion device to the traction device, and the primary forming lower roller, the multiple forming lower roller and the shaping lower roller are arranged in sequence below the magnesium alloy sheet from the extrusion device to the traction device; the primary forming upper roller and the primary forming lower roller are meshed, the multiple forming upper roller and the multiple forming lower roller are meshed, and the shaping upper roller and the shaping lower roller are meshed; a speed measuring device and a temperature measuring device are arranged between the discharge port of the extrusion device and the primary forming lower roller.

[0010] Furthermore, a plurality of supporting rollers are arranged below the magnesium alloy plate.

[0011] Furthermore, an interruption saw is arranged between the roller bending device and the traction device.

[0012] Furthermore, the single-forming upper roller, the single-forming lower roller, the multiple-forming upper roller, the multiple-forming lower roller, the shaping upper roller and the shaping lower roller are respectively provided with electric heating devices.

[0013] Furthermore, a fan is provided on one side of the discharge port of the extrusion device.

[0014] Furthermore, the extrusion device includes an ingot barrel, an extrusion pad, an extruder front beam, and an extrusion die; the extrusion die is arranged at the discharge port of the ingot barrel, and an extrusion pad is arranged at the discharge port of the extrusion die, and the extrusion pad is connected to the extruder front beam.

[0015] The beneficial effects of the utility model compared with the prior art are:

[0016] The utility model combines extrusion and rolling. After extrusion, the magnesium alloy enters the rolling bending equipment and uses the residual heat (sheet temperature 300-400℃) left after the hot extrusion of the magnesium alloy to perform subsequent bending. This online bending process does not require reheating of the sheet or the provision of higher-strength bending equipment, and can achieve online bending of magnesium alloy sheets.

[0017] The bending production equipment adopts the longitudinal rolling process. The rollers use gear rollers with special tooth shapes. The upper and lower rollers mesh with each other and rotate in opposite directions, which can continuously realize multiple forming passes. The plates that are formed by continuous multiple small deformations and finally rolled not only meet the requirements in size, but also have high product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of the magnesium alloy extrusion rolling integrated forming device of the utility model;

[0019] In the figure: 1. speed measuring device; 2. temperature measuring device; 3. one-time forming upper roller; 4. one-time forming lower roller; 5. supporting roller; 6. multiple forming upper roller; 7. multiple forming lower roller; 8. shaping upper roller; 9. shaping lower roller; 10. interruption saw; 11. traction device; 12. extrusion device; 13. magnesium alloy sheet; 14. fan; 15. magnesium alloy billet; 121. ingot holder; 122. extrusion pad; 123. front beam of extruder; 124. extrusion die. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail in combination with the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The technical solution of the present invention is described in detail below in combination with the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0021] See also Figure 1The utility model discloses a magnesium alloy extrusion rolling integrated forming device, comprising an extrusion device 12, a rolling and bending device and a traction device 11 which are arranged in sequence; the rolling and bending device is arranged behind the discharge port of the extrusion device 12, and is used for online rolling and bending the magnesium alloy sheet 13 extruded and sent out from the extrusion device 12; the rolling and bending device comprises a one-time forming upper roller 3, a one-time forming lower roller 4, a multiple forming upper roller 6, a multiple forming lower roller 7, a shaping upper roller 8 and a shaping lower roller 9 with the same structure; the one-time forming upper roller 3, the one-time forming lower roller 4, the multiple forming upper roller 6, the multiple forming lower roller 7, the shaping upper roller 8 and the shaping lower roller 9 are all gear structures; the gear structure is for producing corrugated magnesium alloy plates, so the edges of each pressure roller are all meshing teeth with the same structure, and the magnesium alloy sheet 13 is roll-bent by the meshing of the upper and lower teeth.

[0022] The one-time forming upper roller 3, the multiple forming upper roller 6, and the shaping upper roller 8 are sequentially arranged above the magnesium alloy sheet 13 from the extrusion device 12 to the traction device 11; the one-time forming lower roller 4, the multiple forming lower roller 7, and the shaping lower roller 9 are sequentially arranged below the magnesium alloy sheet 13 from the extrusion device 12 to the traction device 11; the one-time forming upper roller 3 and the one-time forming lower roller 4 are meshed to perform the initial roll bending of the magnesium alloy sheet 13, the multiple forming upper roller 6 and the multiple forming lower roller 7 are meshed to perform further reinforced roll bending of the magnesium alloy sheet 13; finally, the shaping upper roller 8 and the shaping lower roller 9 are meshed to perform the final reinforced roll shaping of the magnesium alloy sheet 13. The one-time forming upper roller 3, the one-time forming lower roller 4, the multiple forming upper roller 6, the multiple forming lower roller 7, the shaping upper roller 8, and the shaping lower roller 9 together constitute a multi-pass roll forming system, which is used to achieve the final bending of the sheet through multiple small deformations, avoiding the rebound or cracking caused by one-time forming.

[0023] A plurality of support rollers 5 are arranged below the magnesium alloy plate 13 to support the magnesium alloy plate 13 .

[0024] The front extrusion device 12 is an existing extruder, which is used to extrude the magnesium alloy billet 15 into a magnesium alloy sheet 13. The extrusion device 12 includes an ingot barrel 121, an extrusion pad 122, an extruder front beam 123, and an extrusion die 124. The magnesium alloy billet 15 is located in the ingot barrel 121. The extrusion die 124 is arranged at the discharge port of the ingot barrel 121, and an extrusion pad 122 is arranged at the discharge port of the extrusion die 124, and the extrusion pad 122 is connected to the extruder front beam 123.

[0025] The traction device 11 is a conventional traction machine, which is used to pull the magnesium alloy sheet 13 at the rear. The traction speed of the device is the same as the speed of the finished product out of the shaping roller, avoiding the phenomenon of stacking and pulling of materials.

[0026] A speed measuring device 1 and a temperature measuring device 2 are provided between the discharge port of the extrusion device 12 and the primary forming lower roller 4, for monitoring the discharge speed and temperature of the magnesium alloy sheet 13 at the outlet. By monitoring the discharge speed, the speed matching of each rolling pass can be achieved to avoid the phenomenon of plate stacking and plate pulling. By monitoring the temperature, low-temperature or high-temperature rolling can be avoided.

[0027] By utilizing the hot extrusion process of the extrusion device 12, the residual heat (sheet temperature 300-400°C) remaining after the extrusion of the magnesium alloy sheet 13 is used for subsequent bending. This online bending process does not require reheating of the sheet or providing a higher strength bending device, and can achieve online bending of the magnesium alloy sheet.

[0028] However, in some cases, such as for magnesium alloy products of different grades, due to the different extrusion temperatures, extrusion ratios, and extrusion speeds, the outlet speed and outlet temperature of the plate are often different. When the outlet temperature is too high, the upper and lower rollers mesh during the rotation process, and the pressure at the meshing point is too large, resulting in a significant change in the thickness of the magnesium alloy plate, and even rolling or cracking. Therefore, the device is also equipped with a fan 14, and a fan 14 is provided on one side of the discharge port of the extrusion device 12, and the plate can be cooled by air cooling. When the outlet temperature is too low, since the magnesium alloy has only two slip systems at low temperatures (≤250°C), it is difficult for the magnesium alloy plate to deform. Therefore, the one-time forming upper roller 3, the one-time forming lower roller 4, the multiple forming upper roller 6, the multiple forming lower roller 7, the shaping upper roller 8, and the shaping lower roller 9 in the device are respectively provided with electric heating devices, and the plate can be heated by electric heating or roller heating.

[0029] An interruption saw 10 is also provided between the roller bending device and the traction device 11. The device can cooperate with the traction device to achieve the purpose of cutting to length.

[0030] The product obtained by continuously bending the magnesium alloy sheet 13 through the magnesium alloy extrusion rolling integrated forming device described in this embodiment is usually called corrugated board. Corrugated board is usually used in trailer boxes, truck boxes, container boxes, insulation structure shells, etc., and the material is usually carbon structural steel or stainless steel. Because the density of steel (7.85g / cm³) is much greater than the density of magnesium alloy (1.8g / cm³), corrugated board made of magnesium alloy can greatly reduce the weight of different structures and achieve the purpose of lightweight products. The magnesium alloy bent products produced by the above equipment not only have high surface quality and precise external dimensions, but also can be cut to size according to customer requirements.

[0031] The above content is a further detailed description of the utility model in combination with a specific preferred implementation method. It cannot be determined that the specific implementation methods of the utility model are limited to this. For ordinary technicians in the technical field to which the utility model belongs, they can make several simple deductions or substitutions without departing from the utility model, which should be regarded as belonging to the utility model and the scope of patent protection determined by the submitted claims.

Claims

1. A magnesium alloy extrusion rolling integrated forming device, characterized in that: The invention comprises an extrusion device (12), a rolling and bending device and a traction device (11) which are arranged in sequence; the rolling and bending device is arranged behind the discharge port of the extrusion device (12) and is used for online rolling and bending the magnesium alloy plate (13) extruded and sent out from the extrusion device (12); the rolling and bending device comprises a one-time forming upper roller (3), a one-time forming lower roller (4), a multiple forming upper roller (6), a multiple forming lower roller (7), a shaping upper roller (8) and a shaping lower roller (9) of the same structure; the one-time forming upper roller (3), the one-time forming lower roller (4), the multiple forming upper roller (6), the multiple forming lower roller (7), the shaping upper roller (8) and the shaping lower roller (9) are all gear structures; the one-time forming upper roller (3), a multiple forming upper roller (6), and a shaping upper roller (8) are sequentially arranged above the magnesium alloy plate (13) in a direction from the extrusion device (12) to the traction device (11); a single forming lower roller (4), a multiple forming lower roller (7), and a shaping lower roller (9) are sequentially arranged below the magnesium alloy plate (13) in a direction from the extrusion device (12) to the traction device (11); the single forming upper roller (3) and the single forming lower roller (4) are meshed with each other, the multiple forming upper roller (6) and the multiple forming lower roller (7) are meshed with each other, and the shaping upper roller (8) and the shaping lower roller (9) are meshed with each other; a speed measuring device (1) and a temperature measuring device (2) are arranged between the discharge port of the extrusion device (12) and the single forming lower roller (4).

2. The magnesium alloy extrusion rolling integrated forming device according to claim 1, characterized in that: A plurality of support rollers (5) are arranged below the magnesium alloy plate (13).

3. The magnesium alloy extrusion rolling integrated forming device according to claim 1, characterized in that: An interruption saw (10) is provided between the roller bending device and the traction device (11).

4. The magnesium alloy extrusion rolling integrated forming device according to claim 1, characterized in that: The primary forming upper roller (3), the primary forming lower roller (4), the multiple forming upper roller (6), the multiple forming lower roller (7), the shaping upper roller (8) and the shaping lower roller (9) are respectively provided with electric heating devices.

5. The magnesium alloy extrusion rolling integrated forming device according to claim 1, characterized in that: A fan (14) is provided on one side of the material outlet of the extrusion device (12).

6. The magnesium alloy extrusion rolling integrated forming device according to claim 1, characterized in that: The extrusion device (12) comprises an ingot holding barrel (121), an extrusion pad (122), an extruder front beam (123), and an extrusion die (124); the extrusion die (124) is arranged at the discharge port of the ingot holding barrel (121), the extrusion pad (122) is arranged at the discharge port of the extrusion die (124), and the extrusion pad (122) is connected to the extruder front beam (123).

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