Energy-saving heating blank continuous extrusion equipment and processing technology

Abstract

The application provides an energy-saving heating blank continuous extrusion equipment and a processing technology. The equipment can realize the extrusion production of high-strength copper alloy, saves the energy consumption required for heating the blank in the extrusion process, guarantees the product quality, makes the equipment structure compact, and does not increase the overall length of the equipment. The equipment comprises a primary heating bin, a secondary heating device, a continuous extruder, a take-up device, a first heat exchange and temperature control system, and a second heat exchange and temperature control system.

Description

Technical Field

[0001] This invention relates to the technical field of copper and copper alloy wire processing, specifically to an energy-saving continuous extrusion equipment for heated billets. The invention also provides the corresponding processing technology for the continuous extrusion equipment. Background Technology

[0002] Compared with traditional extrusion technology, continuous extrusion technology has advantages such as energy saving, environmental protection, and high material utilization. In recent years, it has been widely used in the processing of copper and aluminum materials. The principle of continuous extrusion is as follows: The cavity is located on the side of the extrusion roller. Driven by the rotating extrusion roller, the extruded material enters the extrusion cavity. Under the action of friction in the roller grooves, the temperature and pressure of the material increase. Once a certain value is reached, it is extruded from the die hole to form a tube or wire product. In the continuous extrusion process of some high-strength copper alloys, in order to ensure the operation and load stability of the extruder, the extrusion material is usually preheated to reduce the extrusion difficulty. Currently, the existing extrusion material heating method generally uses resistance wire or induction coil for heating. However, with economic development, the supply of energy and raw materials is becoming increasingly scarce, and people have begun to pay attention to energy consumption. The current extruder uses resistance heating, which consumes a lot of electricity and greatly increases production costs. Therefore, there is an urgent need to make improvements.

[0003] Furthermore, in existing continuous extrusion processes, the extrusion rollers generate a significant amount of heat during operation due to friction with the extruded material. This heat requires a cooling system to ensure the rollers' stability. Additionally, the extrusion rods, after exiting the high-temperature die cavity, also need cooling to prevent oxidation. This heat is often not only unused but also requires additional cooling equipment, resulting in substantial economic losses. Therefore, this patent addresses this issue by proposing an energy-saving continuous extrusion equipment and process for heated billets, enabling the secondary utilization of excess heat and significantly reducing processing costs. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides an energy-saving continuous extrusion equipment for heated billets, which can achieve the extrusion production of high-strength copper alloys while saving the energy required for heating the billets during the extrusion process. It ensures product quality while making the equipment structure compact and does not increase the overall length of the equipment.

[0005] An energy-saving continuous extrusion equipment for heated billets, characterized in that it comprises: The primary heating chamber is equipped with a wire feeding rack inside; Secondary heating device; A continuous extrusion press includes an extrusion roller assembly, an extrusion die cavity, and a water-cooled cooling tank. The discharge port of the extrusion roller assembly is connected to the inlet of the extrusion die cavity, and the water-cooled cooling tank is provided on the outer periphery of the extrusion die cavity. Take-up device; First heat exchange and temperature control system; And a second heat exchange and temperature control system; The extruded billet passes sequentially through the primary heating chamber and the secondary heating device before entering the extrusion gap of the extrusion roller assembly. The pressurized billet is then output along the extrusion die cavity to the take-up device. The first heat exchange and temperature control system controls the temperature of the extrusion roller assembly and transfers the excess heat generated by the extrusion roller assembly during the extrusion process to the primary heating chamber. The second heat exchange and temperature control system controls the temperature of the water-cooled cooling tank and transfers the excess heat obtained from the water-cooled cooling tank to the primary heating chamber.

[0006] Its further features are: The heat exchange mechanism of the first heat exchange and temperature control system is a first tubular heat exchanger and two sets of heat exchange tubes. The heat exchange mechanism of the second heat exchange and temperature control system is a second tubular heat exchanger and two sets of heat exchange tubes. The primary heating chamber is connected to the shell side of the first tubular heat exchanger and the second heat exchanger through two sets of independent heat exchange tubes, respectively, to exchange the excess heat energy obtained from the water-cooled cooling tank and the extrusion wheel group for heating or heat preservation of the extruded billet. A straightening device is also provided between the primary heating chamber and the secondary heating device. The straightening device is located in front of the feed inlet of the secondary heating device to ensure that the straightened extruded billet passes directly through the secondary heating device. The secondary heating device is an electromagnetic induction heating device, which includes a power control section and an electromagnetic induction coil. The extruded billet passes through the hollow cavity of the electromagnetic induction coil. The power control section controls the electromagnetic induction coil to be energized to complete the heating operation of the extruded billet. The extrusion roller assembly includes an upper compaction roller and a lower large-diameter extrusion roller. A cooling liquid chamber is provided at the bottom of the large-diameter extrusion roller. The cooling liquid in the cooling liquid chamber is pumped into the heat exchange tube by a flow pump and connected to the tube side of the first tubular heat exchanger. After the corresponding flow rate of cooling liquid and the air to be heated exchange heat, it returns to the cooling liquid chamber. The flow pump calculates the flow rate according to the temperature of the large-diameter extrusion roller to complete the temperature control of the extrusion roller assembly and transfer the excess heat generated by the extrusion roller assembly during the extrusion process to the primary heating chamber. The water-cooled cooling tank is filled with cooling liquid. The cooling liquid in the water-cooled cooling tank is pumped into the heat exchange tube by a flow pump and connected to the tube side of the second tubular heat exchanger. After the cooling liquid of the corresponding flow rate exchanges heat with the air to be heated, it returns to the water-cooled cooling tank. The flow pump calculates the flow rate according to the temperature of the water-cooled cooling tank, thereby completing the temperature control of the water-cooled cooling tank and transferring the excess heat energy obtained from the heat exchange in the water-cooled cooling tank to the primary heating chamber.

[0007] A continuous extrusion process for heated billets, characterized in that: the extruded billet is continuously heated by a primary heating chamber and a secondary heating device, and the extruded billet, after being heated in two stages, passes sequentially through the extrusion roller assembly and the extrusion die cavity and is then taken up by a take-up device; wherein the heat source of the primary heating chamber includes the heat energy obtained by the first heat exchange and temperature control system through heat exchange with the extrusion roller assembly, and the heat source obtained by the second heat exchange and temperature control system through heat exchange with the water-cooled cooling tank.

[0008] Its further features are: This process can be used for extrusion processing of high-strength copper alloys such as copper-chromium-zirconium and copper-magnesium alloys.

[0009] By adopting this invention, under the premise of ensuring the stable operation and load of the extruder, the excess heat of the extrusion equipment is reasonably utilized to heat the extruded billet. This can not only realize the extrusion production of high-strength copper alloys, but also save the energy consumption required to heat the billet during the extrusion process. While ensuring product quality, it makes the equipment structure compact and does not increase the overall length of the equipment. Attached Figure Description

[0010] Figure 1 This is a simplified schematic diagram of the device of the present invention; The names corresponding to the serial numbers in the diagram are as follows: 1. Extruded billet; 2. Primary heating chamber; 3. Straightening device; 4. Power control unit; 5. Electromagnetic induction coil; 6. Compactor roller; 7. Large-diameter extrusion roller; 8. Extruded die cavity; 9. Water cooling tank; 10. Take-up device; 11. First heat exchange and temperature control system; 12. First tubular heat exchanger; 121. Second heat exchange and temperature control system; 13. Second tubular heat exchanger; 131. Pay-off frame; 14. Detailed Implementation

[0011] An energy-saving continuous extrusion equipment for heated billets, see Figure 1 It includes a primary heating chamber 2, a secondary heating device, a continuous extruder, a take-up device 11, a first heat exchange and temperature control system 12, and a second heat exchange and temperature control system 13; The primary heating chamber 2 is equipped with a wire feeding rack 14; The continuous extrusion press includes an extrusion roller assembly, an extrusion die cavity 8, and a water-cooled cooling tank 10. The discharge port of the extrusion roller assembly is connected to the inlet of the extrusion die cavity 8, and the water-cooled cooling tank 10 is provided on the outer periphery of the extrusion die cavity 8. The extruded billet 1 passes sequentially through the primary heating chamber 2 and the secondary heating device before entering the extrusion gap of the extrusion roller assembly. Then, the pressurized billet 1 is processed along the extrusion die cavity 8 to form the extruded product 9. The extruded product 9 is output to the take-up device 11. The first heat exchange and temperature control system 12 controls the temperature of the extrusion roller assembly and transfers the excess heat generated by the extrusion roller assembly during the extrusion process to the primary heating chamber 2. The second heat exchange and temperature control system 13 controls the temperature of the water-cooled cooling tank 10 and transfers the excess heat obtained from the heat exchange in the water-cooled cooling tank 10 to the primary heating chamber 2.

[0012] In specific implementation, the heat exchange mechanism of the first heat exchange and temperature control system 12 is a first tubular heat exchanger 121 and two sets of heat exchange tubes; The heat exchange mechanism 13 of the second heat exchange and temperature control system is a second tubular heat exchanger 131 and two sets of heat exchange tubes. The primary heating chamber 2 is connected to the shell side of the first tubular heat exchanger 121 and the second heat exchanger 131 through two sets of independent heat exchange tubes, respectively, to exchange the excess heat energy obtained from the water-cooled cooling tank 10 and the extrusion wheel group for heating or heat preservation of the extruded billet 1. A straightening device 3 is also provided between the primary heating chamber 2 and the secondary heating device. The straightening device 3 is located in front of the feed inlet of the secondary heating device to ensure that the straightened extruded billet 1 passes directly through the secondary heating device.

[0013] In a specific embodiment, the secondary heating device is an electromagnetic induction heating device, which includes a power control section 4 and an electromagnetic induction coil 5. The extruded billet 1 passes through the hollow cavity of the electromagnetic induction coil 5. The power control section 4 controls the electromagnetic induction coil 5 to be energized to complete the heating operation of the extruded billet 1.

[0014] In a specific embodiment, the extrusion roller assembly includes an upper compaction roller 6 and a lower large-diameter extrusion roller 7. A cooling liquid chamber is provided in the bottom area of ​​the large-diameter extrusion roller 7. The cooling liquid in the cooling liquid chamber is pumped into the heat exchange tube by a flow pump and connected to the tube side of the first tubular heat exchanger 121. After the corresponding flow rate of cooling liquid and the air to be heated exchange heat, it returns to the cooling liquid chamber. The flow pump calculates the flow rate according to the temperature of the large-diameter extrusion roller 7 to complete the temperature control of the extrusion roller assembly and exchange the excess heat generated by the extrusion roller assembly during the extrusion process into the primary heating chamber 2.

[0015] In a specific embodiment, the water-cooled cooling tank 10 is also filled with cooling liquid. The cooling liquid in the water-cooled cooling tank 10 is pumped into the heat exchange tube by a flow pump and connected to the tube side of the second tubular heat exchanger 131. After the cooling liquid of the corresponding flow rate exchanges heat with the air to be heated, it returns to the water-cooled cooling tank 10. The flow pump calculates the flow rate according to the temperature of the water-cooled cooling tank, completes the temperature control of the water-cooled cooling tank 10, and transfers the excess heat energy obtained by the heat exchange in the water-cooled cooling tank 10 to the primary heating chamber 2.

[0016] A continuous extrusion process for heated billets: The extruded billet is continuously heated using a primary heating chamber and a secondary heating device. After being heated in two stages, the extruded billet passes sequentially through the extrusion roller assembly and the extrusion die cavity before being taken up by a take-up device. The heat source of the primary heating chamber includes heat energy obtained by the first heat exchange and temperature control system through heat exchange with the extrusion roller assembly, and heat energy obtained by the second heat exchange and temperature control system through heat exchange with the water-cooled cooling tank.

[0017] This process can be used to extrude high-strength copper alloys such as copper-chromium-zirconium and copper-magnesium alloys.

[0018] In practice, the continuous extrusion process for extruded blanks includes the following steps: Step 1: Melt the alloy in a melting furnace and obtain a long alloy rod billet through an upward continuous casting process. The weight of the rod billet is about 1-3 tons. The cast rod billet is shaped into a coil to obtain an extruded billet. Step 2: Place the disc-shaped extruded billet inside the primary heating chamber, and pass the extruded billet sequentially through the electromagnetic induction coil of the straightening device and the secondary heating device; Step 3: Set the heating temperature of the primary heating chamber to 100℃ and the heating temperature of the secondary heating device to 200~400℃, then start the continuous extruder; Step 4: The extruded billet is extruded into a continuously extruded alloy product through a continuous extrusion press, and then cooled to room temperature through a water-cooling cooling tank at the die cavity exit of the continuous extrusion press. Step 5: During the operation of the extrusion equipment, the first heat exchange and temperature control system and the second heat exchange and temperature control system transfer the waste heat inside the extrusion wheel assembly and the water-cooled cooling tank to the primary heating chamber to provide heat for the rod blank. Step 6: Wind the continuously extruded alloy product into a coil using a winding device.

[0019] The diameter of the rod blank is 20~25mm, and the continuously extruded alloy products are strips or round rods.

[0020] The purpose of this invention is to provide an energy-saving continuous extrusion equipment and processing technology for heating billets, which can achieve the extrusion production of high-strength copper alloys while saving the energy required for heating the billet during the extrusion process. Specifically, it provides a first heat exchange and temperature control system and a second heat exchange and temperature control system that integrate a tubular heat exchanger on the extrusion press unit to achieve preheating and temperature regulation of the billet, while ensuring product quality. The method is simple, the equipment structure is compact, it does not increase the overall length of the equipment, and it also has the effect of energy saving. Furthermore, the extruded billet is continuously heated using a primary heating chamber and a secondary heating device, with heating occurring in two stages. This improves the stability and efficiency of the heated billet temperature while reducing the surface oxidation of the extruded billet.

[0021] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0022] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An energy-saving continuous extrusion equipment for heated billets, characterized in that, It includes: The primary heating chamber is equipped with a wire feeding rack inside; Secondary heating device; A continuous extrusion press includes an extrusion roller assembly, an extrusion die cavity, and a water-cooled cooling tank. The discharge port of the extrusion roller assembly is connected to the inlet of the extrusion die cavity, and the water-cooled cooling tank is provided on the outer periphery of the extrusion die cavity. Take-up device; First heat exchange and temperature control system; And a second heat exchange and temperature control system; The extruded billet passes sequentially through the primary heating chamber and the secondary heating device before entering the extrusion gap of the extrusion roller assembly. The pressurized billet is then output along the extrusion die cavity to the take-up device. The first heat exchange and temperature control system controls the temperature of the extrusion roller assembly and transfers the excess heat generated by the extrusion roller assembly during the extrusion process to the primary heating chamber. The second heat exchange and temperature control system controls the temperature of the water-cooled cooling tank and transfers the excess heat obtained from the water-cooled cooling tank to the primary heating chamber.

2. The energy-saving continuous extrusion equipment for heated billets according to claim 1, characterized in that: The heat exchange mechanism of the first heat exchange and temperature control system consists of a first tubular heat exchanger and two sets of heat exchange tubes.

3. The energy-saving continuous extrusion equipment for heated billets according to claim 2, characterized in that: The heat exchange mechanism of the second heat exchange and temperature control system consists of a second tubular heat exchanger and two sets of heat exchange tubes.

4. The energy-saving continuous extrusion equipment for heated billets according to claim 3, characterized in that: The primary heating chamber is connected to the shell side of the first tubular heat exchanger and the second heat exchanger through two sets of independent heat exchange tubes, which exchange the excess heat energy obtained from the water-cooled cooling tank and the extrusion wheel assembly for heating or heat preservation of the extruded billet.

5. The energy-saving continuous extrusion equipment for heated billets according to claim 1, characterized in that: A straightening device is also provided between the primary heating chamber and the secondary heating device, and the straightening device is located in the area directly in front of the feed inlet of the secondary heating device.

6. The energy-saving continuous extrusion equipment for heated billets according to claim 1, characterized in that: The secondary heating device is an electromagnetic induction heating device, which includes a power control section and an electromagnetic induction coil. The extruded billet passes through the hollow cavity of the electromagnetic induction coil. The power control section controls the electromagnetic induction coil to be energized to complete the heating operation of the extruded billet.

7. The energy-saving continuous extrusion equipment for heated billets according to claim 2, characterized in that: The extrusion roller assembly includes an upper compaction roller and a lower large-diameter extrusion roller. A cooling liquid chamber is provided at the bottom of the large-diameter extrusion roller. The cooling liquid in the cooling liquid chamber is pumped into the heat exchange tube by a flow pump and connected to the tube side of the first tubular heat exchanger. After exchanging heat with the air to be heated, the cooling liquid of the corresponding flow rate returns to the cooling liquid chamber. The flow pump calculates the flow rate based on the temperature of the large-diameter extrusion roller to complete the temperature control of the extrusion roller assembly and transfer the excess heat generated by the extrusion roller assembly during the extrusion process to the primary heating chamber.

8. The energy-saving continuous extrusion equipment for heated billets according to claim 3, characterized in that: The water-cooled cooling tank is filled with cooling liquid. The cooling liquid in the water-cooled cooling tank is pumped into the heat exchange tube by a flow pump and connected to the tube side of the second tubular heat exchanger. After the cooling liquid of the corresponding flow rate exchanges heat with the air to be heated, it returns to the water-cooled cooling tank. The flow pump calculates the flow rate according to the temperature of the water-cooled cooling tank, thereby completing the temperature control of the water-cooled cooling tank and transferring the excess heat energy obtained from the heat exchange in the water-cooled cooling tank to the primary heating chamber.

9. A continuous extrusion process for heated billets, comprising using an energy-saving continuous extrusion equipment for heated billets as described in any one of claims 1-8, characterized in that: The extruded billet is continuously heated by a primary heating chamber and a secondary heating device. After being heated in two stages, the extruded billet passes sequentially through the extrusion roller assembly and the extrusion die cavity before being taken up by the take-up device. The heat source of the primary heating chamber includes the heat energy obtained by the first heat exchange and temperature control system through heat exchange with the extrusion roller assembly, and the heat source obtained by the second heat exchange and temperature control system through heat exchange with the water cooling tank.

10. The continuous extrusion process for heated billets according to claim 9, characterized in that: It performs extrusion processing on high-strength copper alloys such as copper-chromium-zirconium and copper-magnesium alloys.

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