Centering and fixing hoop for double-wire-drawing flat die
By using double-drawn flat die centering fixing hoops in metal wire processing, the precise positioning and uniform stress of the drawing mold are achieved, solving the problems of low overlap and large losses of traditional molds, and improving production efficiency and product quality.
Patent Information
- Application Number
- CN202323421046.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-15
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2033-12-15
AI Technical Summary
In metal wire processing, it is difficult for traditional wire drawing molds to achieve good overlap at rounded corners, resulting in broken wires of the die, single-sided wear of the mold, inaccurate wire size and poor surface finish, affecting production stability and product quality.
A double-drawn flat die centering fixing hoop is used to achieve accurate positioning of the drawing mold through the keyway and expansion joint of the positioning hoop, ensuring that the center line of the two molds is on the same axis, and simplifying the clamping process by guiding the inclined surface to ensure that the clamping process is simplified. The material is subjected to uniform force.
It effectively solves the problems of low overlap and large loss of molds, extends the service life of wire drawing molds, and improves production efficiency and product quality.
Smart Images
Figure CN222288367U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of molds, in particular to a double-drawing flat mold centering fixing clamp. Background Art
[0002] In the processing of metal wire, the tool that forces the metal to pass through the die under the action of external force, compresses the metal cross-sectional area, and obtains the required cross-sectional area shape and size is called a wire drawing die. The wire drawing die is a very important shaping die for various metal wire manufacturers (such as wire and cable factories, steel wire factories, welding rod and wire factories, etc.) to draw wire.
[0003] In order to improve production competitiveness, foreign metal products industries pay more and more attention to the quality of wire drawing dies and the improvement of manufacturing processes. Starting from improving the life of wire drawing dies, they have conducted systematic research on the materials, structures, manufacturing processes, manufacturing equipment and testing instruments of wire drawing dies, and developed composite wire drawing dies, new materials for wire drawing dies, new surface coating technologies, new hole design methods for wire drawing dies, etc., which have promoted the development of world wire drawing production.
[0004] Generally speaking, the mother wire used in flat wire drawing production is round wire. During the production process, the round wire is drawn after cold rolling or directly drawn in one go. However, the flat wire usually uses a small radius fillet for transition at the corner position. When the wire passes directly through the drawing die, the large fillet of the round wire becomes a small fillet, and the compression deformation is several times or even dozens of times that of the wide or narrow side. Therefore, if the one-draw double-die method is adopted, pre-shaping is performed before the fillet is compressed and deformed, which can significantly reduce the compression deformation of the fillet during the second drawing process, so that the fillet of the metal wire fits the fillet of the mold more closely, avoiding the problem that the fillet of the wire cannot completely fill the mold, resulting in the fillet shape of the wire not being full or having poor finish.
[0005] Under the existing technical background, the size of the busbar feed line can be increased or the angle of the extrusion zone of the wire drawing die can be reduced to extend the extrusion area of the wire drawing die fillet. Although this method can improve the problem of incomplete fillet or poor finish of the metal wire, it is only applicable to the case where the fillet radius size is ≥ 0.4mm, and it will lead to increased drawing force, increase the probability of wire breakage, and shorten the life of the wire drawing flat die. In addition, when the metal material is plastically deformed below the recrystallization temperature, the grains slip, resulting in a large number of dislocations, while the grains are elongated and broken, and cold working residual stress is generated inside the metal, which hinders further deformation of the metal.
[0006] That is, during the drawing process of traditional flat wires, the fillet position is prone to not completely fit the mold, resulting in the flat wire fillet radius being too large or the surface finish being poor, and failing to meet the dimensional accuracy requirements or surface quality requirements. Therefore, some flat wires need to be produced using the "one-draw, two-die" process, with the first shaping die performing a small compression ratio pre-deformation, and then the second shaping die performing compression deformation to become a finished flat wire that meets the dimensional requirements and surface quality requirements.
[0007] However, when the "one drawing, two dies" process was used in the past, it was difficult to ensure that the center lines of the front and rear drawing dies were in the same axial position to achieve a good degree of overlap, which easily led to problems such as die breakage, increased wear on one side of the die, inaccurate wire size, and poor wire surface finish. As a result, the wire drawing die was easily damaged and scrapped, resulting in a waste of materials and labor costs, affecting production stability and efficiency, and causing a decline in product quality. Utility Model Content
[0008] In view of the deficiencies in the above-mentioned prior art, the purpose of the utility model is to provide a double-drawing flat die centering fixed clamp.
[0009] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a double-drawn flat die centering fixed clamp, comprising: a positioning clamp, a side wall of which is provided with a plurality of key slots, and expansion joints connecting the key slots are staggered at the front and rear ends of the positioning clamp.
[0010] Furthermore, the positioning hoop is configured in a tubular shape as a whole.
[0011] As a preferred solution of the present application, the key grooves are distributed in a ring array with the axis of the positioning hoop as a reference.
[0012] As a preferred solution of the present application, the expansion joints are distributed in a ring array with the axis of the positioning hoop as a reference.
[0013] As a preferred solution of the present application, the vertical center of the expansion joint corresponds one-to-one with the vertical center of the keyway and is located on the same vertical extension line.
[0014] As a preferred solution of the present application, one end of the expansion joint is connected to the key slot, and the other end directly extends to the outside of the positioning hoop; the adjacent expansion joints are arranged in opposite extension directions.
[0015] Furthermore, guide slopes are provided on the inner side walls at both ends of the positioning hoop, and the guide slopes are inclined away from the positioning hoop.
[0016] Compared with the prior art, the beneficial effects of the utility model are as follows: the present application can position the wire drawing die so that the axes of two relative wire drawing dies coincide with each other, and secondly, the wire drawing die can be positioned by means of the provided key slots and expansion joints, so that the material is subjected to uniform force in all directions when passing through the wire drawing die, thereby improving the service life of the wire drawing die and solving the problems of low overlap and large die loss in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:
[0018] Figure 1 It is a schematic diagram of the main structure of the utility model;
[0019] Figure 2 It is a top view of the utility model;
[0020] Figure 3 It is a side view of the utility model.
[0021] In the figure: 1. positioning hoop; 2. keyway; 3. expansion joint; 4. guide slope. DETAILED DESCRIPTION
[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.
[0023] The applicant has developed a "one-draw, two-die" process, which first passes the metal busbar through the first die to pre-shape the busbar, so that the round wire is first transformed into a rounded rectangle that is proportionally enlarged from the finished wire; then the die is passed through the second finished wire shaping drawing die to become a semi-finished flat wire. The large rounded rectangular wire formed by the first die does not completely fill the sizing area of the die. Its main function is to reduce the radius of the fillet from the large fillet of the busbar to the subsequent deformable fillet. Generally, the fillet radius is reduced to 10% to 50% of the busbar, but the compression area is only 1% to 10%. The main function of the second die is to compress and deform the large rounded rectangular wire to make it a semi-finished flat wire with the required size.
[0024] However, the applicant found that when using the "one-drawing, two-die" process, the center lines of the mold holes of the shaping mold and the shaping mold are usually difficult to achieve a good overlap, which is prone to problems such as mold breakage, increased wear on one side of the mold, inaccurate wire size, and wire surface finish. As a result, the wire drawing die is easily damaged and scrapped, resulting in waste of materials and labor costs, affecting production stability and production efficiency, and causing product quality to decline. Therefore, using a clamp to limit the shaping mold and the finishing mold to ensure that the center lines of the two are in the same axial position can significantly solve the above problems. The specific technical solution is as follows: Figure 1-3 A double wire drawing flat die centering fixed clamp shown in the figure includes: a positioning clamp 1 which is preferably arranged in a tubular shape (the shape of the positioning clamp 1 can match the shape of the wire drawing die), and a plurality of key grooves 2 are provided on the side wall of the positioning clamp 1. The key grooves 2 are arranged so as to increase the contact area between the coolant or the wire drawing oil and the die, and expansion joints 3 connecting the key grooves 2 are staggered at the front and rear ends of the positioning clamp 1. The deformation of the front and rear ends of the positioning clamp 1 is changed to facilitate the preliminary installation of the wire drawing die into the positioning clamp 1 so as to clamp the wire drawing die; in addition, the expansion joint 3 is provided to discharge metal powder debris generated inside the clamp to ensure that the internal wire drawing oil or wire drawing coolant remains connected to the outside world.
[0025] In order to ensure that the center lines of the drawing dies are on the same axis as much as possible to reduce the position offset of the two drawing dies, at least two key slots 2 are relatively provided. In the present application, preferably 12 key slots 2 are provided, and the key slots 2 are distributed in a circular array with the axis of the positioning hoop 1 as the reference.
[0026] Similarly, at least two expansion joints 3 are relatively arranged. In the present application, a total of 12 expansion joints 3 are distributed up and down along the key slot 2, that is, 6 expansion joints 3 are provided at the upper end surface of the positioning hoop 1, and 6 expansion joints 3 are provided at the lower end surface. The expansion joints 3 are distributed in a circular array with the axis of the positioning hoop 1 as the reference.
[0027] Based on the fact that both the keyway 2 and the expansion joint 3 are based on the axis of the positioning hoop 1, further limitations are imposed on this basis to facilitate the connection of oil and chip removal. Therefore, the vertical center of the expansion joint corresponds to the vertical center of the keyway one by one and are located on the same vertical extension line, that is, the vertical center of the expansion joint 3 is consistent with the vertical center of the keyway 2.
[0028] In actual operation, one end of the expansion joint 3 is connected to the key slot 2, and the other end directly extends to the outside of the positioning hoop 1; adjacent expansion joints 3 are arranged in opposite extending directions, that is, adjacent expansion joints 3 are arranged one above and one below along the key slot 2.
[0029] In order to facilitate the smooth installation of the wire drawing die into the positioning hoop 1 , guide slopes 4 are provided on the inner side walls at both ends of the positioning hoop 1 , and the guide slopes 4 are inclined away from the positioning hoop 1 .
[0030] When the positioning hoop 11 is needed, the wire drawing die only needs to be installed from the upper and lower ends of the positioning hoop 11 respectively, so that the center lines of the front and rear wire drawing dies can be as close to the same axis as possible, effectively reducing the spatial position deviation of the two wire drawing dies and avoiding the problem of wire breakage; and the setting of the keyway 2 and the expansion joint 3 in the present application, while meeting the clamping force on the wire drawing die, makes the force on the material in all directions when passing through the wire drawing die uniform, thereby improving the service life of the wire drawing die and solving the problems of low overlap and large die loss in the prior art.
[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.
Claims
1. A double wire drawing flat die centering fixed clamp, characterized in that: include: A positioning hoop (1) has a side wall provided with a plurality of key slots (2), and expansion joints (3) communicating with the key slots (2) are staggeredly provided at the front and rear ends of the positioning hoop (1).
2. A double wire drawing flat die centering fixing clamp as claimed in claim 1, characterized in that: The positioning hoop (1) is arranged in a tubular shape as a whole.
3. A double wire drawing flat die centering fixing clamp as claimed in claim 2, characterized in that: The key grooves (2) are distributed in a ring array shape with the axis of the positioning hoop (1) as a reference.
4. A double wire drawing flat die centering fixing clamp as claimed in claim 3, characterized in that: The expansion joints (3) are distributed in a ring array shape with the axis of the positioning hoop (1) as a reference.
5. A double wire drawing flat die centering fixing clamp as claimed in claim 4, characterized in that: The vertical center of the expansion joint (3) and the vertical center of the key slot (2) are located on the same vertical extension line.
6. A double wire drawing flat die centering fixing clamp as claimed in claim 4, characterized in that: One end of the expansion joint (3) is connected to the key slot (2), and the other end extends directly to the outside of the positioning hoop (1); adjacent expansion joints (3) are arranged in opposite extension directions.
7. A double wire drawing flat die centering fixing clamp as claimed in claim 1, characterized in that: Guide slopes (4) are provided on the inner side walls at both ends of the positioning hoop (1), and the guide slopes (4) are inclined away from the positioning hoop (1).