CN201711338U - Novel planetary pipe mill - Google Patents

Abstract

The utility model discloses a novel planetary pipe rolling mill, which comprises a feeding mechanism for conveying hollow billets, a planetary main machine for casting and rolling hollow billets, and a roller group and a quick cooling mechanism for rolling dies are arranged in the planetary main machine. An induction preheating mechanism for preheating the hollow cast slab is provided between the discharge end of the feeding mechanism and the feed end of the planetary main engine, and an induction heating mechanism and a slow cooling mechanism are arranged in turn at the discharge end of the planetary main engine , the rolled and rapidly cooled pipe is reheated by the induction soaking mechanism and slowly cooled by the slow cooling mechanism. It can replace the cooperation of extrusion process with horizontal continuous casting machine, straightening and milling machine, continuous stretching machine, online continuous cutting machine, etc., to realize the automatic, continuous and short-process production of high-quality copper alloy tubes.

Description

A New Planetary Pipe Rolling Mill

technical field

The utility model belongs to the field of nonferrous metal processing and manufacturing equipment, in particular to a planetary pipe rolling machine for rolling copper alloy pipes.

Background technique

Copper tube casting and rolling production technology is a short-process and continuous copper tube processing technology developed in the 1980s, especially for the large-scale continuous production of copper tubes for air-conditioning and refrigeration. Way. Due to the high heat transfer coefficient of red copper, no heating is required when rolling with a planetary rolling mill. Relying on the deformation during the rolling process and the large amount of heat generated by high friction, the temperature of the tube billet rises to 700 ° C, causing the tube billet to Dynamic recovery, recrystallization or grain refinement, the rolled tube billet can be directly stretched without annealing. Compared with the traditional extrusion technology, the casting and rolling production technology can greatly improve the production efficiency.

In order to improve the strength, hardness, corrosion resistance and other properties of copper so that it can adapt to the special working environment, one or more of zinc, aluminum, tin, nickel, iron, manganese, silicon and lead elements are added to the copper Copper alloys are formed. At present, the copper alloy tubes rolled by planetary rolling mills have the following disadvantages: 1. Since the heat transfer performance of copper alloys is greatly reduced compared with copper, the deformation resistance at room temperature, work hardening and deformation stress are significantly increased. The heat generated by deformation and friction has been difficult to meet the expected processing requirements. When the tube blank is deformed, local overheating causes the tube blank and the roll to bond, the alloy tube burns and cracks, and the part with insufficient temperature produces hardening stress under the action of large processing volume. Cracking, etc. lead to rolling failure. 2. The rolling process produces deformation at a large processing rate in an instant. Under the action of the rolling die's own lubrication and cooling, the deformed high-temperature alloy tube is cooled to below 60°C or even room temperature in a very short time, resulting in large deformation and rapid cooling. The stress makes the rolled copper alloy tube hard and brittle, which affects the machinability and tube performance of the subsequent drawing process, and it is difficult to realize the short process and automatic continuous production of copper alloy tube. The two patents of "three-roll planetary pipe rolling mill" and "a cooling device for planetary pipe The cooling system of the pipe machine has been improved, but the thermal deformation process of the alloy pipe still cannot meet the process requirements, and it is difficult to achieve uniform dynamic recovery; the cooling method of the improved cooling system also has shortcomings, which cannot meet the requirements of subsequent cold-rolled pipes or pipes. Continuous cold working performance requirements such as stretching process, the industry urgently needs a high-efficiency, continuous production equipment to meet the production requirements of high-quality copper alloy tubes.

Contents of the invention

The problem to be solved by the utility model is to provide a new planetary pipe rolling mill with reasonable design, high efficiency and reliability, which can replace the extrusion process and horizontal continuous casting machine, straightening and milling machine, continuous stretching machine, online continuous cutting machine, etc. With the cooperation, the automatic, continuous and short-process production of high-quality copper alloy tubes can be realized.

In order to solve the above technical solutions, the utility model adopts the following technical solutions: a new type of planetary pipe rolling mill, including a feeding mechanism for conveying hollow billets, a planetary host for casting and rolling hollow billets, and rollers are arranged in the planetary host Group and rolling die rapid cooling mechanism, characterized in that: an induction preheating mechanism for preheating the hollow cast slab is provided between the discharge end of the feeding mechanism and the feed end of the planetary main engine, and the discharge end of the planetary main engine The material end is provided with an induction soaking mechanism and a slow cooling mechanism in sequence, and the rolled pipe is reheated by the induction soaking mechanism and slowly cooled by the slow cooling mechanism.

Further, the discharge end of the induction preheating mechanism is sealed and connected with the feed end of the planetary main engine, the feed end of the induction heating mechanism is sealed and connected with the discharge end of the planetary main engine, and the discharge end of the induction heating mechanism is The end is sealed and connected with the feed end of the slow cooling mechanism; the induction preheating mechanism, the induction heating mechanism and the slow cooling mechanism are respectively equipped with air supply devices for filling the mechanism with protective gas. Ensure that the preheating and rolling process of the hollow billet, the soaking and slow cooling process of the rolled pipe are always carried out in a closed environment full of protective atmosphere, which is isolated from the air and prevents oxidation.

Further, the induction preheating mechanism is a closed whole formed by connecting several independent induction heaters through supporting rollers, and the induction heater is provided with an inductance coil for heating.

Further, the induction heat-spreading mechanism is a closed whole formed by connecting several independent induction heaters through supporting rollers, and the induction heater is provided with an inductance coil for heating.

Further, the slow cooling mechanism is a double-layer cylinder composed of a small-diameter steel sleeve and a large-diameter steel sleeve. The inner cavity of the small-diameter steel sleeve is for the rolled pipe to pass through. It is an annular compartment for the passage of cooling water, and the cooling water conducts indirect heat exchange with the pipe through the small-diameter steel sleeve to realize the slow cooling of the pipe.

Further, the inner cavity of the small-diameter steel sleeve is provided with a partition plate with a through hole to divide the slow cooling mechanism into a first-level slow-cooling section and a second-level slow-cooling section, and a sealing curtain is arranged on the wall of the through-hole, and the two The length of the first-stage slow cooling section is less than that of the first-stage slow cooling section.

Further, the part of the small-diameter steel sleeve located in the secondary slow cooling section is evenly distributed with several oblique water spray holes along its circumference, and one or more groups of water spray holes are arranged axially along the small-diameter steel sleeve. After slow cooling, the cooling water with a temperature of 40-60°C directly sprays the pipes coming from the primary slow cooling section in the form of a small water column, so that the temperature drops from the highest temperature of 300°C to below 60°C.

Further, the feeding mechanism includes a conveying table, a rack for placing the hollow cast slab, and a sorting device for sending the hollow cast slab to the conveying table, and the front end of the conveying table is connected to the feeding end of the induction preheating mechanism , The tail of the conveyor table is provided with a propulsion mechanism to push the hollow billet forward.

Further, the propulsion mechanism includes a core rod with a mandrel, a push head for pushing the core rod forward, and a push trolley for pushing the hollow cast slab forward. The push head feeds the mandrel with the mandrel into the hollow slab and sends it against the hollow slab to the roll group of the planetary host, and then the push trolley pushes the hollow slab to pass through the induction preheating mechanism at a uniform speed within each induction heater.

Further, in the preheating state of the hollow slab, the part of the core rod body located in the induction preheating mechanism has at least one groove along its axial direction with a length not less than the overall length of the induction preheating mechanism, and the groove is filled with insulating Material. The special insulation treatment of the core rod can avoid the inhomogeneity of the internal and external temperature of the tube blank and the temperature rise, redness or melting of the core rod inside the tube blank due to the eddy current effect when the low and medium frequency induction is applied, ensuring that the rolling system proceeds normally.

The beneficial effects of the utility model:

1. Since the induction preheating mechanism is used to preheat the hollow billet before rolling, combined with the heat generated by rolling deformation and friction, the hollow billet can reach a uniform dynamic recovery or even recrystallization temperature, eliminating the need for pipes during the rolling process. The phenomena of over-burning cracking and stress cracking can improve the yield.

2. Setting the induction heating mechanism can timely eliminate the deformation stress caused by the incomplete recrystallization of the deformed pipe with the large processing rate of the planetary host and the phenomenon that the residual stress caused by the cooling of the planetary host after deformation at a large processing rate makes the tube hard after rolling; combining the two The segmental slow cooling method gradually cools the pipe, which can ensure that the pipe reaches the cooling temperature required by the process within the specified slow cooling time without generating cooling stress and hardening of the pipe. After the entire processing process is completed, the hardness of the copper alloy pipe reaches HV5. Below 80, it meets the continuous cold working performance requirements of the subsequent cold rolling pipe or drawing process, so as to realize the casting and rolling production of copper alloy pipes.

3. A special insulation treatment is adopted for the core rod of the pipe rolling mill, which avoids the inhomogeneity of the internal and external temperature of the tube billet and the temperature rise, redness or Melting and other conditions ensure the normal progress of rolling.

4. The process of preheating before rolling, rolling, soaking after rolling and slow cooling of the hollow cast billet is carried out under the condition of nitrogen protection. During the whole working process, the inner and outer surfaces of the processed pipe are bright and free of oxidation; The rolled coffin has excellent internal and external structure and surface quality, and does not require physical and chemical surface treatment such as acid washing, and can be directly processed in the follow-up.

5. The pipe rolling machine provided by the utility model can replace the extrusion process and cooperate with the horizontal continuous casting machine, straightening and milling machine, continuous stretching machine and online continuous cutting machine to realize the automatic, continuous, Short process production, improve the yield and production efficiency of pipes, and achieve the purpose of reducing energy consumption and production costs.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described:

Fig. 1 is the complete machine structural diagram of the present utility model;

Fig. 2 is the structural diagram of the induction preheating mechanism of the present utility model;

Fig. 3 is a structural diagram of the induction heating mechanism of the present invention;

Fig. 4 is the structural diagram of the slow cooling mechanism of the present utility model;

Fig. 5 is an enlarged view at B of Fig. 4;

Fig. 6 is the structural diagram of the core rod of the present utility model;

FIG. 7 is a cross-sectional view along line A-A of FIG. 6 .

Detailed ways

As shown in Figure 1, a new type of planetary pipe rolling mill of the utility model includes a feeding mechanism for conveying hollow billets, a planetary host 1 for casting and rolling hollow billets, and the planetary host 1 is provided with roll groups 11 and Rolling mold rapid cooling mechanism, an induction preheating mechanism 2 for preheating the hollow cast slab is provided between the discharge end of the feeding mechanism and the feed end of the planetary main machine 1, and the discharge end of the planetary main machine 1 is sequentially An induction soaking mechanism 3 and a slow cooling mechanism 4 are provided, and the rolled and rapidly cooled pipe is reheated by the induction soaking mechanism 3 and slowly cooled by the slow cooling mechanism 4 . During the working process, the copper alloy hollow billet with a diameter of 80-100mm and a wall thickness of 8-15mm is processed into a diameter of 40-65mm copper alloy tube with a wall thickness of 2-4mm. The processed copper alloy tube has a bright surface and a hardness of HV5≤80, which meets the performance and quality requirements of subsequent direct cold processing.

With reference to Fig. 2, Fig. 3, induction preheating mechanism 2 is the closed integral body that is formed by four independent induction heaters 21 connected by supporting roller 23, is provided with heating inductance coil 22 in induction heater 21; 3 is a closed whole formed by connecting three independent induction heaters 31 through support rollers 33, and an induction coil 32 for heating is arranged inside the induction heater. The number of induction heaters 21, 31 should be determined according to the heating requirements of the actual workpiece, and the above-mentioned embodiment is only a relatively common structure.

Referring to Fig. 4 and Fig. 5, the slow cooling mechanism 4 is a double-layer cylinder composed of a small-diameter steel sleeve 43 and a large-diameter steel sleeve 42. Between the large-diameter steel sleeve 42 is an annular compartment 44 for cooling water to pass through. The cooling water conducts indirect heat exchange with the pipe through the small-diameter steel sleeve 43 to realize slow cooling of the pipe. The inner cavity 430 of the small-diameter steel sleeve 43 is provided with a dividing plate 431 with a through hole to divide the slow cooling mechanism 4 into a first-level slow cooling section 40 and a second-level slow cooling section 41, and the upper ring of the through hole wall is provided with a sealing curtain 432. The length of the primary slow cooling section 41 is shorter than that of the primary slow cooling section 40 . The temperature of the pipe heated by the induction heating mechanism 3 is 450-750°C, and it is cooled to below 300°C in the primary slow cooling section 40; the part of the small diameter steel sleeve 43 located in the secondary slow cooling section 41 is uniform along its circumference There are several water spray holes 433 arranged obliquely, and one or more groups of water spray holes 433 are arranged along the axial direction of the small-diameter steel sleeve 43. After slow cooling, the cooling water with a temperature of 40-60°C is directly sprayed in the form of a small water column. The temperature of the pipe coming from the primary slow cooling section 40 is reduced from the highest 300°C to below 60°C. The water spray hole 433 can also be replaced by an annular water tank. When cooling, it directly sprays the pipe material coming from the primary slow cooling section 40 in the form of a water curtain, and the water used for cooling adopts clean circulating water without impurities.

The discharge end of the induction preheating mechanism 2 is sealed and connected to the feed end of the planetary host 1, the feed end of the induction heating mechanism 3 is sealed and connected to the discharge end of the planetary host 1, and the induction heating mechanism 3 is sealed. The discharge end is sealed and connected to the feed end of the slow cooling mechanism 4; the induction preheating mechanism 2, the induction soaking mechanism 3 and the slow cooling mechanism 4 are respectively equipped with air supply devices for filling the mechanism with protective gas. Ensure that the preheating and rolling process of the hollow billet, the soaking and slow cooling process of the rolled pipe are always carried out in a closed environment full of protective atmosphere, which is isolated from the air and prevents oxidation.

The feeding mechanism includes a conveying table 5, a rack 6 for placing the hollow cast slab 8, and a sorting device 9 for sending the hollow cast slab 8 to the conveying table 5. The front end of the conveying table 5 is connected to the feeding end of the induction preheating mechanism 2 , The tail of the conveying platform 5 is provided with a propulsion mechanism to push the hollow billet 8 forward. The propulsion mechanism includes a core rod 7 with a mandrel 70, a push head 72 that pushes the core rod 7 forward and a push trolley 71 that pushes the hollow cast slab 8 forward; the push head 72 pushes the core rod 7 with the mandrel 70 Feed into the hollow casting slab 8 and send it to the roll group 11 of the planetary main machine 1 together against the hollow casting slab 8, and then the hollow casting slab 8 is pushed by the pushing trolley 71 to pass through each of the induction preheating mechanism 2 at a uniform speed. Induction heater 21. As shown in Figure 6 and Figure 7, in the preheating state of the hollow cast slab 8, the part of the core rod 7 located in the induction preheating mechanism 2 has at least one length not less than the overall length of the induction preheating mechanism 2 along its axial direction. The trench 73 is filled with an insulating material. Using this special insulation treatment on the core rod 7 can avoid the inhomogeneity of the inner and outer temperature of the tube blank due to the eddy current effect when the low and medium frequency induction is applied, and the temperature rise, redness or melting of the core rod 7 inside the tube blank, ensuring The normal progress of rolling.

Before work, a milling machine can be installed on one side of the whole machine to remove the skin of the hollow billet 8, and the copper alloy hollow billet 8 after face milling is placed on the rack 6, and the core rod 7 returns to the rear limit position When the work starts, the sorting device 9 sends a hollow billet 8 to the conveying platform 5, and the push head 72 pushes the core rod 7 with the mandrel 70 to penetrate into the inner hole of the hollow billet 8 until the mandrel 70 enters In the roll group 11 of the planetary main engine 1, the part with the groove 73 on the hollow mandrel 7 is also placed in the induction preheating mechanism 2; ℃, the push trolley 71 continues to push the hollow slab 8, and the hollow slab 8 undergoes plastic deformation under the high-speed rotating rolling of the planetary host 1 roll group 11, and the frictional heat of the rolling rolling of the roll group 11 and the deformation of the hollow slab 8 Heat makes the working temperature of the hollow billet 8 continue to rise to 600-1100°C when it is rolled and deformed, reaching the recrystallization or recovery softening temperature of the copper alloy, reducing the deformation resistance of the copper alloy, and realizing the copper alloy hollow billet 8 The large amount of deformation of the wall thickness and diameter completes the processing of the hollow billet 8 to the thin-walled copper alloy tube. At the same time, the rolled copper alloy tube is cooled to 60°C by the rolling die rapid cooling mechanism in the planetary host 1. the following. The cooled copper alloy tubes are fed into the induction soaking mechanism 3, and the induction soaking mechanism 3 reheats them to raise the temperature of the copper alloy tubes to 350-750°C, and the heated copper alloy tubes are cooled by the slow cooling mechanism 4. Finally cooled to below 60°C, the copper alloy tubes cooled by the slow cooling mechanism 4 can be interrupted by the online interruption machine and then transferred to the next process for cold processing or directly rolled into coils online by the crimping mechanism for continuous stretching of multiple racks in series. After the work of this copper alloy hollow cast slab 8 is completed, the rolling of the next copper alloy hollow cast slab 8 is circulated sequentially.

In addition to the above-mentioned preferred embodiment, the utility model also has other implementation modes, those skilled in the art can make various changes and deformations according to the utility model, as long as they do not depart from the spirit of the utility model, all should belong to the appended rights of the utility model The scope defined by the requirement.

Claims (10)

1. novel planetary pipe mill, comprise the feed mechanism that is used to carry hollow strand, the planet main frame (1) that is used for the hollow strand of casting, be provided with roll stacks (11) in the planet main frame (1) and roll mould quick cooler structure, it is characterized in that: be provided with between the feed end of the discharge end of described feed mechanism and planet main frame (1) hollow strand is carried out pre-warmed induction preheating mechanism (2), the discharge end of described planet main frame (1) is provided with induction soaking mechanism (3) and slow cooling mechanism (4) successively, and the tubing after rolling speed is cold is heated once more by described induction soaking mechanism (3) and realizes slowly cooling by described slow cooling mechanism (4).

2. a kind of novel planetary pipe mill according to claim 1, it is characterized in that: the feed end of the discharge end of described induction preheating mechanism (2) and planet main frame (1) is tightly connected, the discharge end of the feed end of described induction soaking mechanism (3) and planet main frame (1) is tightly connected, and the discharge end of induction soaking mechanism (3) and the feed end of described slow cooling mechanism (4) are tightly connected; Being separately installed with air supply plant in described induction preheating mechanism (2), induction soaking mechanism (3) and the slow cooling mechanism (4) is used for to the in-house protection gas that charges into.

3. a kind of novel planetary pipe mill according to claim 1 and 2, it is characterized in that: described induction preheating mechanism (2) is by several the sealing integral body that is connected to form by carrying roller (23) of induction heater (21) independently, is provided with heating in the induction heater (21) with inductance coil (22).

4. a kind of novel planetary pipe mill according to claim 1 and 2, it is characterized in that: described induction soaking mechanism (3) is by several the sealing integral body that is connected to form by carrying roller (33) of induction heater (31) independently, is provided with heating in the induction heater (31) with inductance coil (32).

5. a kind of novel planetary pipe mill according to claim 1 and 2, it is characterized in that: described slow cooling mechanism (4) is the double-layer barrel that is made of path steel bushing (43) and big footpath steel bushing (42), the inner chamber (430) of path steel bushing (43) passes through for the tubing after rolling, ring-type separate space (44) for feeding between path steel bushing (43) and the big footpath steel bushing (42) for cooling water, cooling water carries out indirect exchange heat by path steel bushing (43) and tubing, realizes the slow cooling to tubing.

6. a kind of novel planetary pipe mill according to claim 5, it is characterized in that: the dividing plate (431) that the inner chamber (430) of described path steel bushing (43) is provided with a band through hole is divided into one-level slow cooling section (40) and secondary slow cooling section (41) with slow cooling mechanism (4), be equipped with sealing curtain (432) on the through hole hole wall, the length of described secondary slow cooling section (41) is less than the length of one-level slow cooling section (40).

7. a kind of novel planetary pipe mill according to claim 6, it is characterized in that: the part that described path steel bushing (43) is positioned at secondary slow cooling section (41) is evenly equipped with several hole for water sprayings that is obliquely installed (433) along its circumferencial direction, and along path steel bushing (43) one or more groups hole for water spraying is set axially.

8. a kind of novel planetary pipe mill according to claim 1 and 2, it is characterized in that: the sorting unit (9) that described feed mechanism comprises transport platform (5), places the bin (6) of hollow strand (8) and be used for hollow strand (8) is sent into transport platform (5), the front end of described transport platform (5) connects the feed end of induction preheating mechanism (2), and transport platform (5) afterbody is provided with and promotes the propulsive mechanism that hollow strand (8) advances.

9. a kind of novel planetary pipe mill according to claim 8 is characterized in that: described propulsive mechanism comprises the core bar (7) that has plug (70), promote the pushing tow head (72) that core bar (7) advances and promote the pushing tow dolly (71) that hollow strand (8) advances.

10. a kind of novel planetary pipe mill according to claim 9, it is characterized in that: under hollow strand (8) preheat mode, the part that core bar (7) body of rod is positioned at induction preheating mechanism (2) axially has the groove (73) that at least one length is not less than induction preheating mechanism (2) entire length along it, and groove is filled with insulating materials in (73).

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