Rough and medium tension pressure die for steel cord production
By designing a thick medium-pull pressure mold for production of steel cords directly assembled through threads, the problems of existing molds being prone to water leakage at the joints under water-cooled environments and low efficiency of wire drawing powder is solved, and more efficient wire drawing powder and lower assembly difficulty is achieved, and production quality is improved.
Patent Information
- Application Number
- CN202421640096.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-11
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-11
AI Technical Summary
The existing rough medium-pull pressure molds for steel cord production need to be proficient in the connections under water-cooled environment, which is prone to water leakage problems, and the wire drawing powder liquefies in an irregularly shaped pressure cavity to form a spoiler, affecting the powder removal efficiency.
A thick medium-pull pressure mold for production of steel cords directly assembled by threads is designed. The first mold and the second mold are connected by threads to form a conical space after assembly, which conforms to fluid mechanics, increases the powder-tearing efficiency of the wire drawing powder and reduces assembly difficulty.
It improves the powder-tearing efficiency of silk drawing powder, reduces assembly difficulty, avoids water leakage, protects molds, and improves production quality.
Smart Images
Figure CN222919338U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of steel cord production, in particular to a rough and medium drawing pressure die for steel cord production. Background Technique
[0002] Steel cord is the skeleton material of automobile radial tires. In the early stage of the steel cord production process, a 5.5-mm steel wire is drawn to about 1.0 - 2.0 mm through a die. During this process, lubrication is carried out with wire drawing powder. The powder-carrying effect of the wire drawing powder during the drawing process plays a decisive role in the product quality of the drawn steel wire. Therefore, how to increase the amount of wire drawing powder brought in is an important research topic in this industry.
[0003] The currently used technology is to add an auxiliary die at the front end of the working die, which is the same as the working die but has a different hole diameter. The two dies are connected by a copper gasket, and the former die plays a role in increasing powder carrying. The main problems existing currently are that the working environment of the die is a water-cooled environment, and the installation of the copper gasket at the connection requires skilled workers, otherwise, water leakage is likely to occur. Using the same die as the pressure die forms a pressure cavity during the drawing process. The cavity shape is irregular due to the influence of the die, and the wire drawing powder will form a turbulent flow after liquefying in the pressure cavity, affecting the powder-carrying efficiency. Content of the Utility Model
[0004] Aiming at the technical problems existing in the rough and medium drawing pressure die in the prior art, in the first aspect of the utility model, a rough and medium drawing pressure die for steel cord production is proposed, which includes a first die and a second die;
[0005] The first die is provided with a first die cavity, the first die cavity penetrates from the first end to the second end of the first die, and a threaded connection part is provided at the second end of the first die;
[0006] The first end of the second die is provided with a threaded groove, the threaded connection part is connected to the threaded groove, and the second die is provided with a second die cavity, the second die cavity penetrates from the first end to the second end of the second die;
[0007] Wherein, a copper ring is provided between the end face of the first end of the second die and the end face of the second end of the first die. When the first die is assembled to the first end of the second die, the copper ring is in a slightly compressed state, and the axis of the first die cavity coincides with the axis of the second die cavity.
[0008] Preferably, the inlet diameter of the second die cavity is larger than the outlet diameter of the first die cavity.
[0009] Preferably, the first mold cavity includes a first cavity and a second cavity distributed from the first end to the second end. The first cavity is configured as a frustum of a cone, and its diameter gradually decreases from the first end to the second end of the first mold. The second cavity is configured as a cylinder.
[0010] Preferably, the diameter of the second cavity is L2, and the minimum diameter of the first cavity is L1, where L1 = L2.
[0011] Preferably, the second mold cavity includes a third cavity, a fourth cavity, a fifth cavity, and a sixth cavity distributed from the first end to the second end. The third cavity is configured as a frustum of a cone, and its diameter gradually decreases from the first end to the second end. The fourth cavity is configured as a frustum of a cone, and its diameter gradually decreases from the first end to the second end. The fifth cavity is configured as an annulus, and the sixth cavity is configured as a frustum of a cone with its diameter gradually increasing from the first end to the second end.
[0012] Preferably, the minimum diameter of the third cavity is L3, the maximum diameter of the fourth cavity is L4, the minimum diameter of the fourth cavity is L5, the diameter of the fifth cavity is L6, and the minimum diameter of the sixth cavity is L7, where L3 = L2 = L4 > L5 = L6 = L7.
[0013] Preferably, the outer diameter of the copper ring is greater than the maximum diameter of the third cavity, and the inner diameter of the copper ring is less than the maximum diameter of the third cavity.
[0014] Preferably, the slope of the inclined surface of the third cavity is greater than the slope of the inclined surface of the fourth cavity.
[0015] Compared with the prior art, the advantages of the present utility model are as follows:
[0016] By designing the first mold and the second mold used in drawing to be directly assembled by threads, the rhombus space between the original first mold cavity and the second mold cavity becomes a conical space after assembly, which is more in line with hydrodynamics, can increase the powder-carrying efficiency of the wire-drawing powder, and has lower assembly difficulty, lower operation requirements for employees, is not prone to water leakage after assembly, can better protect the mold, and improve the production quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The drawings are not intended to be drawn to scale. In the drawings, each identical or approximately identical component shown in each figure can be denoted by the same reference numeral. For the sake of clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the present utility model will be described by way of examples and with reference to the drawings, where:
[0018] Figure 1 is a schematic structural diagram of a rough and medium drawing pressure mold in the prior art;
[0019] Figure 2 It is a schematic structural view of a rough and medium drawing pressure die for steel cord production shown by the present utility model;
[0020] Figure 3 It is a schematic view of a steel wire passing through the die shown by the present utility model. Specific embodiments
[0021] For a better understanding of the technical content of the present utility model, specific embodiments are hereby given and described in conjunction with the accompanying drawings as follows.
[0022] As Figure 1 shown, currently, the rough and medium drawing dies for steel cord include Die A and Die B. The cavities of the two dies are symmetrical, and the cavity of Die A is slightly larger. The steel wire is drawn from the left side to the right side and passes through the cavities of Die A and Die B in sequence. Among them, Die A and Die B are sunk into water during drawing for cooling. There is drawing powder on the surface of the steel wire during drawing. After entering the diamond-shaped cavity between Die A and Die B, the drawing powder generates vortices, which is not conducive to maintaining the uniform distribution of the drawing powder on the surface of the steel wire. In addition, Die A and Die B rely on the copper ring between them to achieve sealing, which requires skills for the installation workers. Therefore, it is not conducive to the drawing of the steel wire.
[0023] Combined with Figures 2-3 shown, the first aspect of the present utility model provides a rough and medium drawing pressure die for steel cord production, including a first die 10 and a second die 20; the first die 10 is provided with a first cavity, the first cavity runs through from the first end to the second end of the first die 10, and a threaded connection part 13 is provided at the second end of the first die 10; a threaded groove 201 is provided at the first end of the second die 20, the threaded connection part 13 is connected to the threaded groove 201, and the second die 20 is provided with a second cavity, and the second cavity runs through from the first end to the second end of the second die 20.
[0024] In this way, the first die 10 and the second die 20 are threadedly connected. During assembly, the copper ring 30 is placed into the threaded groove 201, and the threaded connection part 13 of the first die 10 is screwed into the threaded groove 201 and tightened. This is beneficial for unskilled workers to connect the first die 10 and the second die 20 together and avoid water seepage from the gap between the first die 10 and the second die 20.
[0025] Furthermore, a copper ring 30 is provided between the end face of the first end of the second die 20 and the end face of the second end of the first die 10. When the first die 10 is assembled to the first end of the second die 20, the copper ring 30 is in a slightly compressed state, and the axes of the first cavity and the second cavity coincide.
[0026] Thus, after the first mold 10 and the second mold 20 are connected together, the formed gap path is from outside to inside, first passing through the threaded gap and then sealed by the copper ring 30, which can ensure good sealing performance.
[0027] Furthermore, the inlet diameter of the second cavity is larger than the outlet diameter of the first cavity. The steel wire is pre-stretched by the first cavity first, and then drawn into a preset diameter by the second cavity. By setting a large-size cavity at the inlet of the second cavity, the drawing resistance can be reduced and a temporary storage space for drawing powder can be formed.
[0028] In an alternative embodiment, as Figures 2-3 shown, the first cavity includes a first cavity 11 and a second cavity 12 distributed from the first end to the second end. The first cavity 11 is configured as a frustum of a cone, and its diameter gradually decreases from the first end to the second end of the first mold 10. The second cavity 12 is configured as a cylinder.
[0029] Wherein, the diameter of the second cavity 12 is L2, and the minimum diameter of the first cavity 11 is L1, and L1 = L2.
[0030] Thus, the thick steel wire becomes thinner under the pressure of the first cavity 11 and is then stabilized to a fixed diameter size by the second cavity 12.
[0031] Furthermore, the second cavity includes a third cavity 21, a fourth cavity 22, a fifth cavity 23, and a sixth cavity 24 distributed from the first end to the second end. The third cavity 21 is configured as a frustum of a cone, and its diameter gradually decreases from the first end to the second end. The fourth cavity 22 is configured as a frustum of a cone, and its diameter gradually decreases from the first end to the second end. The fifth cavity 23 is configured as a ring, and the sixth cavity 24 is configured as a frustum of a cone, and its diameter gradually increases from the first end to the second end.
[0032] Wherein, the minimum diameter of the third cavity 21 is L3, the maximum diameter of the fourth cavity 22 is L4, the minimum diameter of the fourth cavity 22 is L5, the diameter of the fifth cavity 23 is L6, and the minimum diameter of the sixth cavity 24 is L7, and L3 = L2 = L4 > L5 = L6 = L7.
[0033] Thus, the steel wire passing through the second cavity 12 is further pressed by the fourth cavity 22, and its diameter is further reduced. The excess drawing powder on the surface of the steel wire can accumulate at the inlet of the third cavity 21, increasing the powder-carrying efficiency of the drawing powder. The steel wire is stably drawn through the fifth cavity 23 to form a steel wire with a fixed diameter.
[0034] Optionally, the outer diameter of the copper ring 30 is larger than the maximum diameter of the third cavity 21, and the inner diameter of the copper ring 30 is smaller than the maximum diameter of the third cavity 21. Thus, it can ensure that the copper ring 30 closely fits the end faces of the first mold 10 and the second mold 20 to achieve the sealing effect.
[0035] Preferably, the slope of the inclined plane of the third cavity 21 is greater than the slope of the inclined plane of the fourth cavity 22. In this way, after the steel wire undergoes a greater deformation effect first, it is then subjected to a slower wire drawing through the fourth cavity 22 to reduce the stress generated on the steel wire during wire drawing.
[0036] In an alternative embodiment, the cavity diameter design is related to the wire drawing diameter. When the wire drawing diameter is 0.95 - 1.80 mm, the cavity diameter is the wire drawing diameter + 0.25 mm; when the wire drawing diameter is 1.81 - 2.40 mm, the cavity diameter is the wire drawing diameter + 0.31 mm; when the wire drawing diameter is 2.41 - 5.50 mm, the cavity diameter is the wire drawing diameter + 0.40 mm.
[0037] Optionally, for trial production of the 2.40 - 1.08 specifications, wire drawing is performed on products of 9 specifications, namely 2.16, 1.95, 1.78, 1.62, 1.48, 1.36, 1.25, 1.16, and 1.08. The aperture diameters (inner diameters of the fifth cavity 23) of the working areas of the pressure die designs are 9 specifications of 2.65, 2.41, 2.20, 2.03, 1.87, 1.73, 1.61, 1.50, and 1.41, corresponding to the above 9 specifications of products respectively.
[0038] Among them, the wire drawing speed is 12 m / s, and the trial production lasts for 30 days. For the quality inspection ratio of the steel wire, the proportion of grade - 1 products is 80%, and the proportion of grade - 2 products is 20%, which is higher than that of the original process where the proportion of grade - 1 products is 60%, the proportion of grade - 2 products is 35%, and the proportion of grade - 3 products is 5%. The working die is replaced for inspection after 30 days. Except for slight damage on the surfaces of the 2.16 and 1.08 passes, there is no obvious damage in the other passes. This process has an obvious effect of protecting the working die.
[0039] Combining the above embodiments, by designing the first die and the second die used during wire drawing to be directly assembled through threads, the rhombus space between the original first die cavity and the second die cavity becomes a conical space after assembly, which is more in line with hydrodynamics, can increase the powder - carrying efficiency of the wire - drawing powder, and has a lower assembly difficulty, lower operation requirements for employees, is not prone to water leakage after assembly, can better protect the die, and improve the production quality.
[0040] Although the present utility model has been disclosed above with preferred embodiments, it is not intended to limit the present utility model. Those with ordinary knowledge in the technical field to which the present utility model belongs can make various changes and modifications without departing from the spirit and scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to what is defined by the claims.
Claims
1. A rough and medium drawing pressure die for steel cord production, characterized in that: It comprises a first mold (10) and a second mold (20); The first mold (10) is provided with a first mold cavity, the first mold cavity runs through the first end to the second end of the first mold (10), and the second end of the first mold (10) is provided with a threaded connection portion (13); The first end of the second mold (20) is provided with a thread groove (201), the threaded connection portion (13) is connected to the thread groove (201), and the second mold (20) is provided with a second mold cavity, and the second mold cavity runs from the first end to the second end of the second mold (20); A copper ring (30) is provided between the first end surface of the second mold (20) and the second end surface of the first mold (10); when the first mold (10) is assembled to the first end of the second mold (20), the copper ring (30) is in a slightly compressed state, and the axis of the first mold cavity coincides with the axis of the second mold cavity.
2. The rough and medium drawing pressure die for steel cord production according to claim 1, characterized in that: The inlet diameter of the second mold cavity is larger than the outlet diameter of the first mold cavity.
3. The rough and medium drawing pressure die for steel cord production according to claim 1, characterized in that: The first mold cavity comprises a first cavity (11) and a second cavity (12) distributed from the first end to the second end, the first cavity (11) being constructed in a frustum shape, with a diameter gradually decreasing from the first end to the second end of the first mold (10), and the second cavity (12) being constructed in a cylindrical shape.
4. The rough and medium drawing pressure die for steel cord production according to claim 3, characterized in that: The diameter of the second cavity (12) is L2, the minimum diameter of the first cavity (11) is L1, and L1=L2.
5. The rough and medium drawing pressure die for steel cord production according to claim 4, characterized in that: The second mold cavity comprises a third cavity (21), a fourth cavity (22), a fifth cavity (23) and a sixth cavity (24) distributed from the first end to the second end, the third cavity (21) is constructed in a frustum shape, and its diameter gradually decreases from the first end to the second end, the fourth cavity (22) is constructed in a frustum shape, and its diameter gradually decreases from the first end to the second end, the fifth cavity (23) is constructed in a ring shape, and the sixth cavity (24) is constructed in a frustum shape, and its diameter gradually increases from the first end to the second end.
6. The rough and medium drawing pressure die for steel cord production according to claim 5, characterized in that: The minimum diameter of the third cavity (21) is L3, the maximum diameter of the fourth cavity (22) is L4, the minimum diameter of the fourth cavity (22) is L5, the diameter of the fifth cavity (23) is L6, and the minimum diameter of the sixth cavity (24) is L7, L3=L2=L4>L5=L6=L7.
7. The rough and medium drawing pressure die for steel cord production according to claim 5, characterized in that: The outer diameter of the copper ring (30) is greater than the maximum diameter of the third cavity (21), and the inner diameter of the copper ring (30) is smaller than the maximum diameter of the third cavity (21).
8. The rough and medium drawing pressure die for steel cord production according to claim 5, characterized in that: The slope of the inclined surface of the third cavity (21) is greater than the slope of the inclined surface of the fourth cavity (22).