A bimetal synchronous deformation drawing press die for coating metal wire

Abstract

The utility model relates to a bimetallic synchronous deformation drawing pressure die of coated metal wire, belong to metallurgical industry metal wire production equipment technical field. Technical scheme is: contain die bush (1), entrance die core (2) and working die core (3), die bush (1) is ladder cylindrical, the centre of die bush (1) is equipped with die bush inner hole (8), the diameter of die bush inner hole (8) and the diameter of entrance die core (2) and working die core (3) match, the outlet end of die bush inner hole (8) is the ladder type of by big to small, forms the export blocking step (6), entrance die core (2) and working die core (3) are arranged in die bush inner hole (8) respectively, working die core (3) is located at the outlet end of die bush inner hole (8), and working die core (3) is matched with export blocking step (6). The utility model has the beneficial effects that: can improve die bush wear resistance and service life, reduce the processing difficulty and manufacturing cost of die bush simultaneously, improve wire rod yield.

Description

Technical Field

[0001] This utility model relates to a bimetallic synchronous deformation drawing pressure die for coated metal wire, belonging to the technical field of metal wire production equipment in the metallurgical industry. Background Technology

[0002] Metal-clad wires are composite wires with a high-strength metal core, such as steel or Invar, and an outer layer of conductive metal, such as aluminum or copper. They combine the mechanical properties of the core, such as tensile strength and modulus of elasticity, with the physical properties of the cladding, such as conductivity and corrosion resistance. In the field of power transmission conductors, the most common metal-clad wires are aluminum-clad steel and aluminum-clad Invar. Among them, aluminum-clad Invar is widely used in high-capacity transmission lines due to its high strength and low expansion characteristics.

[0003] Taking aluminum-clad Invar as an example, the preparation of clad metal wire requires diameter reduction drawing to achieve the desired specifications. Due to the significant differences in cross-sectional area and alloy deformation tensile strength between the steel core and the aluminum layer, ordinary wire drawing techniques cannot achieve synchronous deformation of the Invar and aluminum, easily leading to the separation of the aluminum layer. The current industry solution is to use hydrodynamic lubrication technology, adding a pressure device in front of the drawing die. The core of this device is the pressure die. When the aluminum-clad Invar wire passes through the pressure die, it carries in lubricating powder. As the lubricating powder accumulates, the high radial pressure within the die cavity forces the aluminum layer and steel core to undergo synchronous plastic deformation, resolving the deformation mismatch problem caused by the difference in the mechanical properties of the bimetallic materials.

[0004] The core of the aforementioned pressure device is the pressure die, which has a long, narrow inner hole, a smooth surface, and high precision requirements, making it difficult to manufacture. Currently, pressure dies are all made of a single material, such as carbon steel, die steel, or cemented carbide. Using carbon steel or die steel to manufacture pressure dies results in less difficult manufacturing and higher precision compared to cemented carbide, but poorer wear resistance. Using cemented carbide to manufacture pressure dies provides better wear resistance, but is more difficult to manufacture, more expensive, and less economical. Furthermore, during the aluminum-clad Invar reduction drawing process, the inner surface of the pressure die hole will wear, especially at the die nozzle. Because the lubricating powder has not yet accumulated to form sufficient radial pressure, lubrication at this point is poor. After a certain period of operation, the pressure die hole diameter wears larger and becomes elliptical, causing the die to be scrapped. Simultaneously, replacing the pressure die requires cutting the wire at the die, reducing the wire yield. Utility Model Content

[0005] The purpose of this invention is to provide a bimetallic synchronous deformation drawing pressure die for coated metal wire, which can improve the wear resistance and service life of the die and solve the problems existing in the background art.

[0006] The technical solution of this utility model is: A bimetallic synchronous deformation drawing pressure die for coated metal wire includes a die sleeve, an inlet die core, and a working die core. The die sleeve is a stepped cylinder with an inner hole at its center. The diameter of the inner hole matches the diameters of the inlet die core and the working die core. The outlet end of the inner hole is a stepped shape that decreases in size, forming an outlet blocking step. The inlet die core and the working die core are respectively disposed in the inner hole of the die sleeve. The working die core is located at the outlet end of the inner hole of the die sleeve and cooperates with the outlet blocking step.

[0007] The inlet mold core has an inlet mold core hole, and the working mold core has a working mold core hole. The diameters of the inlet mold core hole and the working mold core hole are the same as the outlet diameter of the inner hole of the mold sleeve.

[0008] The outlet diameter of the inner hole of the mold is designed according to the wire specifications.

[0009] The entrance to the mold core hole is a trumpet-shaped entrance.

[0010] The outer surface of the mold is a stepped cylinder composed of a cylindrical body, a fixing boss, and a tightening reinforcing boss.

[0011] The outer surface of the die sleeve at the outlet end of the inner hole is an outlet slope that matches the wire drawing die.

[0012] The beneficial effects of this invention are as follows: The mold adopts a double-layer nested structure with dissimilar materials, concentrating high-wear-resistant components such as the mold core in the wear-prone area. This improves the mold's wear resistance and service life while reducing processing difficulty and manufacturing costs. Its lifespan is increased from 20-24 hours to 500-700 hours. The split-nesting design simplifies the processing, reduces processing difficulty, and saves manufacturing costs, resulting in a 50-60% reduction compared to all-carbide molds. This effectively reduces mold replacement frequency and increases wire yield by 5-7%. Attached Figure Description

[0013] Figure 1 This is a perspective view of the present utility model; Figure 2 Schematic diagram of the inlet mold core; Figure 3 This is a schematic diagram of the working mold core; Figure 4 This is a cross-sectional view of the assembled version of this utility model; Figure 5 This is a cross-sectional view of the mold of this utility model; In the figure: mold sleeve 1, inlet mold core 2, working mold core 3, fixed boss 4, tightening reinforcing boss 5, outlet blocking step 6, outlet slope 7, mold sleeve inner hole 8, trumpet-shaped inlet 9, inlet mold core hole 10, working mold core hole 11. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and examples.

[0015] See attached document Figure 1-5 A bimetallic synchronous deformation drawing pressure die for coated metal wire includes a die sleeve 1, an inlet die core 2, and a working die core 3. The die sleeve 1 is a stepped cylinder with an inner hole 8 at its center. The diameter of the inner hole 8 matches the diameters of the inlet die core 2 and the working die core 3. The outlet end of the inner hole 8 is a stepped shape that decreases in size, forming an outlet blocking step 6. The inlet die core 2 and the working die core 3 are respectively disposed in the inner hole 8. The working die core 3 is located at the outlet end of the inner hole 8 and cooperates with the outlet blocking step 6.

[0016] In this embodiment, refer to the appendix Figure 1-5 The mold comprises a mold sleeve 1, an inlet mold core 2, and a working mold core 3. Its manufacturing and assembly process is as follows: 1. Mold material selection and manufacturing The die sleeve 1 is made of die steel, such as 42CrMo, and is machined by turning. The die sleeve 1 is a stepped cylindrical shape, including a cylindrical body, a fixing boss 4, a tightening reinforcing boss 5, and an outlet bevel 7. The diameter of the die sleeve inner hole 8 is designed according to the wire specifications, such as an initial hole diameter of 5mm. The outlet of the die sleeve inner hole 8 is a stepped shape that decreases in size, forming an outlet blocking step 6.

[0017] The inlet mold core 2 and the working mold core 3 are made of cemented carbide, such as YG8, and are precision ground. The surface finish of the inlet mold core hole 10 and the working mold core hole 11 is Ra0.4μm. The inlet of the inlet mold core hole 10 is a trumpet-shaped inlet 9.

[0018] Due to the high difficulty in machining cemented carbide, the working core components of the entire mold can be manufactured in sections, namely, an inlet mold core and at least one working mold core, which can be flexibly configured according to production needs and processing conditions. When the overall mold length is short, only the inlet mold core can be machined and assembled; when the overall mold length is long, one inlet mold core and one or more working mold cores can be machined and assembled, reducing the difficulty of mold machining.

[0019] 2. Assembly process First, heat the mold sleeve 1 to 300-400℃ to make the inner hole 8 of the mold sleeve expand due to heat; then put in the inlet mold core 2 and one working mold core 3 in sequence. After the mold sleeve 1 cools down, it naturally shrinks and generates shrinkage stress. The tightening reinforcement boss 5 ensures a firm fit (interference fit amount 0.05mm); after assembly, the outlet blocking step 6 prevents the working mold core 3 from falling out, and the fixing boss 4 is used to fix it to the wire drawing mold box.

[0020] 3. Application process Installation and Use: Insert the assembled die into the pressure device of the wire drawing production line, ensuring the fixing boss 4 is tightly fitted against the die fixing sleeve. During the reduction drawing of aluminum-clad Invar wire (Invar core, aluminum cladding), the wire is introduced through the trumpet-shaped inlet 9, passing through the inlet die core hole 10 and entering the working die core hole 11. As the wire is drawn, lubricating powder is carried into the die cavity, accumulating at the working die core 3 to form a high-pressure zone, forcing the aluminum layer and Invar core to deform synchronously. The outlet slope 7 matches the subsequent wire drawing die to ensure stable pressure transmission.

[0021] Performance evaluation: After 500 hours of continuous drawing, the wear of the working die core 3 was slight, and the change in its hole diameter was <0.01mm, which avoided the elliptical wear and scrapping problems of single-material dies; the die replacement frequency was reduced, and the wire yield increased from 90% to 95-97%.

[0022] The specific dimensions of one embodiment of this utility model are as follows: The mold sleeve 1 has an overall length of 150mm and an outer diameter of φ30mm. The inlet mold core 2 has a length of 75mm, an inner diameter of φ5mm, and an outer diameter of φ8mm. The working mold core 3 has a length of 70mm, an inner diameter of φ5mm, and an outer diameter of φ8mm. The fixed boss 4 has an outer diameter of φ50mm. The tightening reinforcing boss 5 has an outer diameter of φ40mm. The outlet blocking step 6 has an inner diameter of φ5mm, an outer diameter of φ8mm, and a length of 5mm. The outlet inclined surface 7 has an angle of 60°. The horn-shaped inlet 9 has a rounded corner diameter of 11mm.

Claims

1. A bimetallic synchronous deformation drawing pressure die for coated metal wire, characterized in that: It includes a mold sleeve (1), an inlet mold core (2) and a working mold core (3). The mold sleeve (1) is a stepped cylinder. The center of the mold sleeve (1) is provided with an inner hole (8). The diameter of the inner hole (8) matches the diameter of the inlet mold core (2) and the working mold core (3). The outlet end of the inner hole (8) is a stepped shape that decreases in size, forming an outlet blocking step (6). The inlet mold core (2) and the working mold core (3) are respectively set in the inner hole (8) of the mold sleeve. The working mold core (3) is located at the outlet end of the inner hole (8) of the mold sleeve. The working mold core (3) cooperates with the outlet blocking step (6).

2. The bimetallic synchronous deformation drawing pressure die for coated metal wire according to claim 1, characterized in that: The inlet mold core (2) is provided with an inlet mold core hole (10), and the working mold core (3) is provided with a working mold core hole (11). The diameters of the inlet mold core hole (10) and the working mold core hole (11) are the same as the outlet diameter of the inner hole (8) of the mold sleeve.

3. The bimetallic synchronous deformation drawing pressure die for coated metal wire according to claim 2, characterized in that: The outlet diameter of the inner hole (8) of the mold sleeve is designed according to the wire specifications.

4. The bimetallic synchronous deformation drawing pressure die for coated metal wire according to claim 2, characterized in that: The entrance of the inlet mold core hole (10) is a trumpet-shaped entrance (9).

5. The bimetallic synchronous deformation drawing pressure die for coated metal wire according to claim 1, characterized in that: The outer surface of the mold (1) is a stepped cylinder composed of a cylindrical body, a fixed boss (4) and a tightening reinforcing boss (5).

6. The bimetallic synchronous deformation drawing pressure die for coated metal wire according to claim 1, characterized in that: The outer surface of the mold (1) at the outlet end of the inner hole (8) of the mold is an outlet slope (7) that matches the wire drawing die.

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