Drawing die for copper tube

Abstract

The utility model discloses a kind of drawing dies of copper pipe, belong to copper pipe processing technical field, it includes mould shell, the central hole is set in the middle part of mould shell, the upper side and the lower side position of mould shell in correspondence with central hole are respectively set with three drawing holes.The drawing die of copper pipe, generated friction heat is transferred to heat conduction pedestal, then heat exchange treatment is carried out by cooling medium inside serpentine bend, the setting of serpentine bend increases the time that cooling medium stays around drawing hole, so that generated friction heat can be quickly exported, cooling water pump can extract cooling medium in the serpentine bend of upper side or lower side by one of liquid guide pipe, so that cooling medium can circulate in the inside of two heat conduction pedestals, cooperate with the setting of the plurality of heat conduction fins outside liquid guide pipe, part of heat can be transferred to heat exhaust assembly, starting heat dissipation fan can discharge the heat in central hole and heat exhaust assembly, prevent damage to mould due to high temperature environment, guarantee the mechanical property of copper pipe.

Description

Technical Field

[0001] The utility model belongs to the technical field of copper pipe processing, and specifically relates to a drawing die for copper pipes. Background Art

[0002] Copper pipe drawing is the core process for copper pipe forming, and its technical level directly determines the final performance of copper pipe products. A drawing die is a key component in this process that is in direct contact with the copper pipe and realizes plastic deformation.

[0003] During the use of existing drawing dies, the lubrication methods are usually oil mist lubrication or oil immersion lubrication. It is difficult to form a stable and uniform lubricating film between the inner hole of the die and the surface of the copper pipe, which aggravates the adhesion wear between the die and the copper pipe. Moreover, a large amount of frictional heat generated during the drawing process is difficult to be discharged in time, which will cause the temperature of the die to rise, accelerate die wear, and also affect the mechanical properties of the copper pipe. Contents of Utility Model

[0004] To overcome the above-mentioned defects, the utility model provides a drawing die for copper pipes, which solves the problems that it is difficult for lubricating oil to form a stable and uniform lubricating film between the inner hole of the die and the surface of the copper pipe, which aggravates the adhesion wear between the die and the copper pipe; and a large amount of frictional heat generated during the drawing process is difficult to be discharged in time, which will cause the temperature of the die to rise, accelerate die wear, and also affect the mechanical properties of the copper pipe.

[0005] To achieve the above objective, the utility model provides the following technical solution: a drawing die for copper pipes, comprising a die shell, a central hole is opened in the middle of the die shell, three drawing holes are respectively opened at positions corresponding to the upper part and the lower part of the central hole in the die shell, a lubrication assembly is installed on one side of the die shell at positions corresponding to the upper and lower drawing holes, a cooling assembly is installed inside the central hole, the cooling assembly comprises heat-conducting bases, the number of the heat-conducting bases is two, the heat-conducting bases are embedded inside the die shell, a serpentine curved groove is opened inside each heat-conducting base, two liquid guide pipes are connected and installed between the two heat-conducting bases, the liquid guide pipes communicate with openings at the ends of the two serpentine curved grooves, a cooling water pump is installed between the bottom end of one of the liquid guide pipes and the lower serpentine curved groove, and a heat discharge assembly is fixedly installed inside the central hole.

[0006] As a further solution of the utility model: the heat-conducting base is designed in a shape of a square ring, and is embedded in the position corresponding to the outer side of the drawing hole inside the die shell.

[0007] As a further solution of the utility model: the lubrication assembly comprises an oil storage box, the oil storage box is fixed on one side of the die shell, three cotton wicks are fixed inside the oil storage box, the ends of the cotton wicks penetrate through the oil storage box and are connected with oil-impregnated asbestos, and the oil-impregnated asbestos corresponds to the positions of the drawing holes.

[0008] As a further embodiment of this utility model: a protective cover is fixed on one side of the mold shell corresponding to the three drawing holes, the oil-impregnated asbestos is a ring design and fixed inside the protective cover, and a scale strip and an injection valve are provided on one side of the oil storage box.

[0009] As a further embodiment of this utility model: the heat dissipation assembly includes heat dissipation fins, the number of heat dissipation fins is several and fixed in the central hole, the heat dissipation fins are provided with several heat dissipation holes, and the heat dissipation fins on both sides are respectively fixed with multiple heat-conducting plates, the heat-conducting plates are snapped onto the outside of the liquid guide tube.

[0010] As a further embodiment of this utility model: air vents are provided on the front and back of the mold shell respectively, and a cooling fan is installed in the air vent on the back of the mold shell.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The copper tube drawing die, during the drawing process, allows the frictional heat generated in the drawing hole to be transferred to the heat-conducting base, and then the heat is exchanged by the cooling medium inside the serpentine groove. Because the heat-conducting base has a U-shaped design and is embedded inside the die shell at the position corresponding to the outside of the drawing hole, and because the serpentine groove increases the residence time of the cooling medium around the drawing hole, the generated frictional heat can be quickly discharged. Some of the heat will be transferred to the heat dissipation component through the die shell. The cooling water pump can draw the cooling medium in the upper or lower serpentine groove through one of the liquid guide pipes, so that the cooling medium can circulate inside the two heat-conducting bases. With the setting of multiple heat-conducting plates outside the liquid guide pipes, some of the heat can be transferred to the heat dissipation component. The cooling fan can be activated to discharge the heat inside the center hole and the heat dissipation component, so as to achieve the purpose of circulating cooling of the drawing die, preventing damage to the die due to high temperature environment, and ensuring the mechanical properties of the copper tube. 2. The copper tube drawing die pulls the copper tube by passing it through the lubrication assembly and the drawing hole in the die shell, and with the help of external traction equipment. During this process, the copper tube can come into contact with the oil-impregnated asbestos inside the protective cover. The cotton swab has absorbency and introduces the oil from the oil reservoir into the oil-impregnated asbestos. Because the oil-impregnated asbestos has a ring-shaped design, it fully fits the outer wall of the copper tube, so that the lubricating oil in the oil-impregnated asbestos will slowly seep out under the action of pressure and frictional heat, continuously forming a uniform and long-lasting lubricating film on the outer surface of the copper tube, thereby improving the lubrication effect. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the mold shell of this utility model; Figure 3 This is a schematic diagram of the lubrication assembly of this utility model; Figure 4 This is a schematic diagram of the cooling component of this utility model; Figure 5 This is a schematic diagram of the structure of the mold shell and the cooling fan of this utility model; In the diagram: 1. Mold shell; 2. Center hole; 3. Drawing hole; 4. Lubrication assembly; 401. Oil reservoir; 402. Cotton swab; 403. Protective cover; 404. Oil-impregnated asbestos; 405. Scale bar; 406. Injection valve; 5. Cooling assembly; 501. Heat-conducting base; 502. Serpentine groove; 503. Liquid guide pipe; 504. Heat-conducting plate; 505. Cooling water pump; 6. Heat dissipation assembly; 601. Heat dissipation fins; 602. Heat dissipation hole; 7. Air vent; 8. Cooling fan. Detailed Implementation

[0013] The technical solution of this patent will be further described in detail below with reference to specific embodiments.

[0014] like Figure 1-5 As shown, this utility model provides a technical solution: a drawing die for copper tubes, including a die shell 1, a central hole 2 in the middle of the die shell 1, and three drawing holes 3 respectively above and below the central hole 2 in the die shell 1. A lubrication component 4 is installed on one side of the die shell 1 corresponding to the positions of the upper and lower drawing holes 3. The lubrication component 4 includes an oil storage box 401, which is fixed to one side of the die shell 1. Three cotton swabs 402 are fixed inside the oil storage box 401. The ends of the cotton swabs 402 penetrate the oil storage box 401 and are connected to oil-impregnated asbestos 404. The oil-impregnated asbestos 404 corresponds to the position of the drawing holes 3. The cotton swabs 402 have adsorption properties and introduce the oil inside the oil storage box 401 into the oil-impregnated asbestos 404. Since the oil-impregnated asbestos 404 is annularly designed, it fully fits the outer wall of the copper tube, so that the lubricating oil in the oil-impregnated asbestos 404 will slowly seep out under the action of pressure and frictional heat, continuously forming a lubricating film on the outer surface of the copper tube, thereby improving the lubrication effect. A protective cover 403 is fixed on one side of the mold shell 1 at the position corresponding to the three drawing holes 3. The oil-impregnated asbestos 404 is a ring design and is fixed inside the protective cover 403. A scale bar 405 and an injection valve 406 are provided on one side of the oil storage box 401. The scale bar 405 is set to observe the oil level inside the oil storage box 401 so that it can be added in time through the injection valve 406.

[0015] A cooling assembly 5 is installed inside the central hole 2. The cooling assembly 5 includes a heat-conducting base 501. There are two heat-conducting bases 501. The heat-conducting bases 501 are embedded inside the mold shell 1. A serpentine groove 502 is opened inside the heat-conducting base 501. The heat-conducting base 501 has a U-shaped design and is embedded inside the mold shell 1 at the position corresponding to the outside of the drawing hole 3. The setting of the serpentine groove 502 increases the time that the cooling medium stays around the drawing hole 3, so that the generated frictional heat can be quickly discharged. Two liquid guide pipes 503 are connected between two heat-conducting bases 501. The liquid guide pipes 503 are connected to the openings at the ends of two serpentine bends 502. A cooling water pump 505 is installed between the bottom end of one of the liquid guide pipes 503 and the lower serpentine bend 502. A heat dissipation assembly 6 is fixedly installed inside the central hole 2. The heat dissipation assembly 6 includes heat dissipation fins 601. There are several heat dissipation fins 601 and they are fixed inside the central hole 2. Several heat dissipation holes 602 are opened in the heat dissipation fins 601. Several heat-conducting plates 504 are fixed on the heat dissipation fins 601 on both sides. The heat-conducting plates 504 are snapped onto the outside of the liquid guide pipes 503. Heat will be transferred to the multiple heat dissipation fins 601 through the mold shell 1. With the setting of multiple heat dissipation holes 602, the heat dissipation effect is improved by increasing the heat conduction area.

[0016] The front and back of the mold shell 1 are respectively provided with air holes 7. A cooling fan 8 is installed in the air hole 7 on the back of the mold shell 1. By controlling the operation of the cooling fan 8, the heat inside the central hole 2 and the heat dissipation fins 601 can be extracted. The outside air is guided to the heat dissipation fins 601 through the central hole 2 and the air hole 7, which accelerates the dissipation of heat.

[0017] The working principle of this utility model is as follows: When the copper tube is being drawn, it is passed through the lubrication assembly 4 and the drawing hole 3 in the mold shell 1. The copper tube is then pulled by an external traction device. During this process, the copper tube can come into contact with the oil-impregnated asbestos 404 inside the protective cover 403. The cotton swab 402 has an absorbent property and introduces the oil inside the oil storage box 401 into the oil-impregnated asbestos 404. Since the oil-impregnated asbestos 404 is designed to fit the outer wall of the copper tube, the lubricating oil in the oil-impregnated asbestos 404 will slowly seep out under pressure and frictional heat, thus achieving the purpose of lubricating the copper tube. The large amount of frictional heat generated during the copper tube drawing process allows the frictional heat generated in the drawing hole 3 to be transferred to the heat-conducting base 501, and then heat exchanged by the cooling medium inside the serpentine groove 502. Because the heat-conducting base 501 has a U-shaped design and is embedded inside the mold shell corresponding to the outer side of the drawing hole 3, and because the serpentine groove 502 increases the residence time of the cooling medium around the drawing hole 3, the generated frictional heat can be quickly dissipated. Some of the heat is transferred through the mold shell 1 to the multiple heat dissipation fins 601 in the heat dissipation assembly 6, thereby increasing the heat exchange rate. To improve heat dissipation, the heat conduction area is increased. By starting the cooling water pump 505, the cooling water pump 505 can draw the cooling medium from the upper or lower serpentine groove 502 through one of the liquid guide pipes 503, so that the cooling medium can circulate inside the two heat conduction bases 501. With the arrangement of multiple heat conduction plates 504 outside the liquid guide pipe 503, some heat can be transferred to the heat dissipation fins 601. Starting the cooling fan 8 can exhaust the heat inside the center hole 2 and the heat dissipation fins 601, so as to achieve the purpose of circulating cooling of the drawing die.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] The preferred embodiments of this patent have been described in detail above. However, this patent is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this patent.

Claims

1. A drawing die for copper tubes, comprising a die shell (1), characterized in that: The mold shell (1) has a central hole (2) in the middle. Three drawing holes (3) are respectively provided above and below the central hole (2) in the mold shell (1). A lubrication assembly (4) is installed on one side of the mold shell (1) at the positions corresponding to the upper and lower drawing holes (3). A cooling assembly (5) is installed inside the central hole (2). The cooling assembly (5) includes two heat-conducting bases (501). 1) Embedded inside the mold shell (1), the heat-conducting base (501) has a serpentine groove (502) inside, and two liquid guide pipes (503) are connected between the two heat-conducting bases (501). The liquid guide pipe (503) is connected to the opening at the end of the two serpentine grooves (502). A cooling water pump (505) is installed between the bottom end of one of the liquid guide pipes (503) and the lower serpentine groove (502). A heat dissipation component (6) is fixedly installed inside the central hole (2).

2. The drawing die for a copper tube according to claim 1, characterized in that: The heat-conducting base (501) is designed in the shape of a U-shape and is embedded inside the mold shell (1) at the position corresponding to the outside of the pull hole (3).

3. The drawing die for a copper tube according to claim 1, characterized in that: The lubrication assembly (4) includes an oil reservoir (401) fixed to one side of the mold shell (1). Three cotton swabs (402) are fixed inside the oil reservoir (401). The ends of the cotton swabs (402) penetrate the oil reservoir (401) and are connected to oil-impregnated asbestos (404). The oil-impregnated asbestos (404) corresponds to the position of the pull hole (3).

4. The drawing die for a copper tube according to claim 3, characterized in that: A protective cover (403) is fixed on one side of the mold shell (1) at the position corresponding to the three pull holes (3). The oil-impregnated asbestos (404) is a ring design and is fixed inside the protective cover (403). A scale strip (405) and an injection valve (406) are provided on one side of the oil storage box (401).

5. The drawing die for a copper tube according to claim 1, characterized in that: The heat dissipation assembly (6) includes heat dissipation fins (601), which are a plurality of each and are fixed in the center hole (2). The heat dissipation fins (601) have a plurality of heat dissipation holes (602). The heat dissipation fins (601) on both sides are respectively fixed with a plurality of heat-conducting plates (504), which are snapped onto the outside of the liquid guide tube (503).

6. The drawing die for a copper tube according to claim 5, characterized in that: The mold shell (1) has air holes (7) on the front and back sides respectively, and a cooling fan (8) is installed in the air hole (7) on the back side of the mold shell (1).

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