Mold core assembly for composite lead wire production and composite lead wire preparation method

Abstract

The invention relates to a mold core assembly for composite lead wire production and a composite lead wire preparation method, belongs to the technical field of energy storage batteries, and solves the problems of high wire breaking frequency and low preparation efficiency when a mold core assembly is used for preparing a composite lead wire in the prior art. Comprising an inlet die, a middle die and an outlet die, the inlet die and the outlet die are assembled and connected through the middle die, and the middle die is provided with an alloy inlet; the diameter of the inlet end of the core material coated lead layer channel of the outlet mold is gradually reduced along the material flowing direction to form a conical inlet end; the end part of the core material lead-in mold core of the inlet mold is conical, and the taper angle faces the outlet mold; the conical end part of the core material lead-in mold core is positioned in the conical inlet end of the outlet mold, and an alloy conical channel is formed between the two cones. The die core assembly is low in wire breaking frequency and high in preparation efficiency when being used for preparing composite lead wires.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage batteries, and in particular to a mold core assembly for producing composite lead wire and a method for preparing the composite lead wire. Background Art

[0002] To improve the electrical performance and cycle life of energy storage batteries, composite lead wire is widely used in battery grids. Composite lead wire refers to lead wire with alloy lead wrapped around the core material.

[0003] When the existing mold core assembly is used to prepare composite lead wire, the wire breakage frequency is high and the efficiency of preparing the lead wire is low. Summary of the Invention

[0004] In view of the above analysis, an embodiment of the present invention aims to provide a core mold assembly for composite lead wire production and a method for preparing composite lead wire, so as to solve at least one of the following problems existing in the preparation of composite lead wire using the existing core mold assembly: (1) high frequency of wire breakage; (2) low efficiency in preparing lead wire.

[0005] In one aspect, the present invention provides a mold core assembly for producing composite lead wire, the mold core assembly comprising an inlet mold, an intermediate mold, and an outlet mold, wherein the inlet mold and the outlet mold are assembled and connected via the intermediate mold, and the intermediate mold is provided with an alloy inlet;

[0006] The diameter of the inlet end of the core material-coated lead layer channel of the outlet die gradually decreases along the material flow direction to form a tapered inlet end;

[0007] The end of the core material introduction mold core of the inlet mold is tapered, and the tapered angle faces the outlet mold; the tapered end of the core material introduction mold core is located inside the tapered inlet end of the outlet mold, and an alloy tapered channel is formed between the two cones.

[0008] Preferably, the angle between the oblique side of the alloy tapered channel and the horizontal line is greater than the angle between the oblique side of the tapered end of the core material introduction mold core and the horizontal line.

[0009] Preferably, the angle between the oblique side of the alloy tapered channel and the horizontal line is 10-35 degrees greater than the angle between the oblique side of the tapered end of the core material introduction mold core and the horizontal line.

[0010] Preferably, the angle between the hypotenuse of the alloy tapered channel and the horizontal line is 45-65 degrees.

[0011] Preferably, the angle between the hypotenuse of the tapered end of the core material introduction mold core and the horizontal line is 30-35 degrees.

[0012] Preferably, the distance L between the end face of the core material introduction mold core and the end of the tapered inlet end of the core material coating lead layer channel is 1 / 2-3 / 5 of the diameter of the core material coating lead layer channel.

[0013] Preferably, the projection of the oblique edge of the tapered end of the core material introducing mold core on the horizontal plane is closer to the inlet end of the inlet mold than the projection of the oblique edge of the alloy tapered channel on the horizontal plane.

[0014] Preferably, the alloy inlet is opposite to the oblique edge of the tapered end portion of the core material introduction mold core.

[0015] Preferably, the middle mold is provided with two alloy inlets.

[0016] In a second aspect, the present invention provides a method for preparing composite lead wire, which uses the above-mentioned core mold assembly for composite lead wire production.

[0017] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0018] 1. The core die assembly for composite lead wire production of the present invention changes the intersection of the inlet die and the outlet die from the traditional flat-to-flat form to a conical nested form, forming an alloy conical channel. The molten alloy from the alloy inlet of the middle die and the core material introduced into the die core from the inlet die core material are combined in the alloy conical channel and then coated. The alloy conical channel converts the alloy pressure into a thrust in the same direction as the running track of the composite core material, effectively reducing the shear force of the high pressure in the furnace body on the die core and the composite core material, avoiding the high pressure of the alloy lead directly acting on the composite core material, thereby reducing the occurrence of wire breakage failures and reducing the frequency of wire breakage (the frequency of wire breakage can be reduced from the current 6 times per day to 1-3 times per day), thereby increasing production efficiency.

[0019] 2. The present invention reduces the wire diameter deviation and wire breakage frequency of the composite lead wire by optimizing the cone angle of the alloy cone channel and the distance L between the end face of the core material introduction mold core and the end of the cone entrance end of the core material coated lead layer channel.

[0020] In the present invention, the above-mentioned technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of the present invention will be described in the following description, and some advantages will become apparent from the description or be learned through practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like parts throughout the drawings.

[0022] Figure 1This is an overall diagram of the mold core assembly for producing composite lead wire of the present invention;

[0023] Figure 2 This is a discrete structural diagram of a mold core assembly for producing composite lead wire according to the present invention;

[0024] Figure 3 for Figure 1 AA cross-section of

[0025] Figure 4 for Figure 3 A magnified view of the middle part C;

[0026] Figure 5 This is an overall diagram of a mold core assembly for composite lead wire production in the prior art;

[0027] Figure 6 for Figure 5 BB cross-section diagram;

[0028] Figure 7 for Figure 6 Enlarged view of part D in the middle.

[0029] Reference numerals:

[0030] 1-entrance mold; 101-core material introduction mold core; 102-entrance mold base; 103-core material introduction channel; 2-intermediate mold; 201-alloy inlet; 3-exit mold; 301-core material coated lead layer channel; 302-exit mold core; 303-exit mold base; 4-alloy conical channel; L-the distance between the end face of the core material introduction mold core and the end of the conical inlet end of the core material coated lead layer channel. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, and are not used to limit the scope of the present invention.

[0032] Existing core components for preparing composite lead wire are as follows Figure 5-Figure 7 As shown, it includes an inlet mold 1, an intermediate mold 2, and an outlet mold 3. The molten alloy lead enters from the alloy inlet 201 of the intermediate mold 2, merges with the core material from the inlet mold 1, and then enters the core material coating lead layer channel 301 of the outlet mold 3 for coating.

[0033] The inventors found in their research that the reason why wire breakage occurs when composite lead wire is prepared using the existing core assembly is that the existing core assembly, such as Figure 5-Figure 7As shown in the figure, the inlet end of the core material-coated lead layer channel of the outlet die is a vertical plane with a uniform diameter. It is face-to-face with the end face of the inlet die core material introduced into the die core, and there is a certain distance between the two. When the alloy is introduced from the alloy inlet of the middle die, the internal high pressure is completely released on the composite core material. Since the core material is a thinner wire, when this pressure cannot be completely balanced around the composite core material, the wire breakage phenomenon occurs. In other words, the core material breaks because it cannot withstand the shear force generated by the high pressure in the furnace.

[0034] Based on this, the present invention provides a mold core assembly for composite lead wire production, such as Figures 1-4 As shown, the core die assembly for composite lead wire production includes an inlet die 1, an intermediate die 2 and an outlet die 3. The inlet die 1 and the outlet die 3 are assembled and connected through the intermediate die 2. The intermediate die 2 is provided with an alloy inlet 201.

[0035] The diameter of the inlet end of the core material-coated lead layer channel 301 of the outlet die 3 gradually decreases along the material flow direction, forming a tapered inlet end;

[0036] The end of the core material introduction mold core 101 of the inlet mold 1 is tapered, and the tapered angle faces the outlet mold 3; the tapered end of the core material introduction mold core 101 is located inside the tapered inlet end of the outlet mold 3, and an alloy tapered channel 4 is formed between the two cones;

[0037] During implementation, the molten alloy from the alloy inlet 201 enters the alloy conical channel 4, merges with the core material from the core material introduction mold core 101, and then enters the core material coating lead layer channel 301 for coating.

[0038] Compared with the prior art, the core die assembly for composite lead wire production of the present invention changes the intersection of the inlet die and the outlet die from the traditional plane-to-plane form to a conical nested form, forming an alloy conical channel. The molten alloy from the alloy inlet of the middle die and the core material introduced into the die core from the inlet die core material are combined in the alloy conical channel and then coated. The alloy conical channel converts the alloy pressure into a thrust in the same direction as the running track of the composite core material, effectively reducing the shear force of the high pressure in the furnace body on the die core and the composite core material, avoiding the high pressure of the alloy lead directly acting on the composite core material, thereby reducing the occurrence of wire breakage failures, reducing the frequency of wire breakage, and increasing production efficiency.

[0039] In the present invention, the function of the inlet die 1 is to guide the core material into the core material coating lead layer channel 301 of the outlet die 3 to ensure that the core material and the outer alloy lead layer are concentric.

[0040] Exemplarily, the inlet mold 1 includes an inlet mold base 102 and a core material introduction mold core 101 , and the core material introduction mold core 101 is provided with a core material introduction channel 103 for the core material to pass through.

[0041] In the present invention, the outlet die 3 functions to coat the core material with the alloy lead layer before exiting the die. The outlet die 3 comprises an outlet die base 303 and an outlet die core 302; the outlet die 3 is provided with a core material coating channel 301. This channel 301 extends through the inlet and outlet of the outlet die 3. This means that after the core material and alloy are combined, they travel a distance through the channel 301 before the composite lead wire is produced. This improves the surface quality and uniformity of the coating layer compared to directly producing the composite lead wire after the core material and alloy are combined.

[0042] In the present invention, the function of the intermediate mold 2 is to fix the distance between the core material introduction channel 103 of the inlet mold 1 and the core material coating lead layer channel 301 of the outlet mold 3. The size of the spacing determines the efficiency and quality of the core material and alloy lead coating during the production of composite lead wire. Generally, when coating the alloy lead layer, the spacing between the outlet mold core and the inlet mold core is large, and the production efficiency is very high. However, the core material is prone to breakage due to a large internal pressure surface during production. If the spacing is small, it is not easy to break, but the production efficiency is low. Therefore, adjusting the spacing becomes a key factor in balancing the production speed and core material failure.

[0043] Specifically, the intermediate die 2 is an annular structure, with the inlet die 1 and outlet die 3 mounted at either end. Specifically, the core material introduction die core 101 and outlet die core 302 are mounted within the annular ends of the intermediate die 2. A cavity is defined between the intermediate die 2 and the core material introduction die core 101. The alloy from the alloy inlet 201 enters this cavity and then enters the alloy tapered channel 4. The core material introduction channel 103 is coaxial with the core material lead coating channel 301.

[0044] Exemplarily, the included angle between the hypotenuse of the alloy tapered channel 4 and the horizontal line is greater than the included angle between the hypotenuse of the tapered end of the core material introduction mold core 101 and the horizontal line.

[0045] Exemplarily, the angle between the hypotenuse of the alloy conical channel 4 and the horizontal line is 10-35 degrees greater than the angle between the hypotenuse of the tapered end of the core material introduction mold core 101 and the horizontal line, for example, 12 degrees greater, 15 degrees greater, 17 degrees greater, 19 degrees greater, 20 degrees greater, 22 degrees greater, 24 degrees greater, 26 degrees greater, 28 degrees greater, 30 degrees greater, 32 degrees greater, or 34 degrees greater. Angle control can achieve a balance between the lead intake and lead output while meeting the lead intake amount. Moreover, an angle that is too large or too small will cause the raw material to deviate from the balance, resulting in eccentricity or surface burrs in the composite lead wire, that is, the coated core material is not in the center of the cross section, which is eccentricity. When the wire diameter value deviation is greater than 0.3, it is detected as an inferior product. The present invention reduces the wire diameter deviation of the composite lead wire by optimizing the cone angle of the alloy conical channel 4.

[0046] Specifically, the specific size of the angle can be selected according to the diameter of the composite lead wire.

[0047] For example, for producing composite lead wire with a diameter of 1.5 mm, the angle between the hypotenuse of the tapered end of the core material introduction mold core 101 and the horizontal line is 30-35 degrees, such as 31 degrees, 32 degrees, 33 degrees, or 34 degrees.

[0048] For example, for producing composite lead wire with a diameter of 1.5 mm, the angle between the hypotenuse of the alloy tapered channel 4 and the horizontal line is 45-65 degrees, such as 46 degrees, 48 ​​degrees, 50 degrees, 52 degrees, 54 degrees, 56 degrees, 58 degrees, 60 degrees, 62 degrees, and 64 degrees.

[0049] For example, for producing composite lead wire with a diameter of 2.0 mm, the angle between the hypotenuse of the tapered end of the core material introduction mold core 101 and the horizontal line is 35-40 degrees, such as 36 degrees, 37 degrees, 38 degrees, or 39 degrees.

[0050] For example, for producing composite lead wire with a diameter of 2.0 mm, the angle between the hypotenuse of the tapered end of the core material introduction mold core 101 and the horizontal line is 60-75 degrees, such as 62 degrees, 64 degrees, 68 degrees, 70 degrees, 72 degrees, and 74 degrees.

[0051] Exemplarily, the distance L between the end face of the core material introduction mold core 101 and the end of the tapered inlet end of the core material coating lead layer channel 301 is 1 / 2-3 / 5 of the diameter of the core material coating lead layer channel 301, and most preferably 1 / 2. The present invention reduces wire diameter deviation and wire breakage frequency of the composite lead wire by optimizing the distance L between the end face of the core material introduction mold core 101 and the end of the tapered inlet end of the core material coating lead layer channel 301.

[0052] That is to say, the distance L between the end face of the core material introduction mold core 101 and the end of the tapered inlet end of the core material coated lead layer channel 301 is determined according to the diameter of the composite lead wire produced. For example, the distance L between the end face of the core material introduction mold core 101 and the end of the tapered inlet end of the core material coated lead layer channel 301 is 0.8-1.2 mm, for example 1.9 mm, 1.0 mm, 1.1 mm.

[0053] In the present invention, the alloy and the core material converge in the alloy conical channel 4, which serves to eliminate the core material breakage phenomenon caused by the high pressure in the mold. In order to further promote the alloy to flow into the alloy conical channel 4 and further reduce the shear force of the system pressure on the core material introduction mold core 101, the projection of the hypotenuse of the conical end of the core material introduction mold core 101 on the horizontal plane is closer to the inlet end of the inlet mold 1 than the projection of the hypotenuse of the alloy conical channel 4 on the horizontal plane. That is to say, the inclined surface of the conical end of the core material introduction mold core 101 is staggered with the inclined surface of the alloy conical channel 4, so that part of the inclined surface of the conical end of the core material introduction mold core 101 is not opposite to the inclined surface of the alloy conical channel 4. This part of the inclined surface plays a guiding role on the alloy, further reducing the shear force of the system pressure on the core material introduction mold core 101.

[0054] Furthermore, the alloy inlet 201 is opposite to the bevel of the tapered end of the core material introduction mold core 101. In this embodiment, during the production of composite lead wire, the internal high pressure will directly act on the bevel of the core material introduction mold core 101, and the pressure direction will be changed through the bevel to be consistent with the direction of core material movement, thereby further reducing the shear force of the system pressure on the core material introduction mold core 101, reducing wire breakage, and increasing work efficiency.

[0055] Exemplarily, two alloy inlets 201 are provided on the middle mold 2 .

[0056] For example, the two alloy inlets 201 are symmetrical about the axis of the middle mold 2, which can promote pressure balance of the alloy.

[0057] It should be noted that, in the present invention, the alloy refers to an alloy containing lead, that is, alloy lead.

[0058] Exemplarily, the core material is glass fiber or conductive metal wire.

[0059] Specifically, for the positive electrode composite lead wire, the core material is glass fiber or carbon fiber; for the negative electrode composite lead wire, the core material is a highly conductive material, such as aluminum wire, magnesium-aluminum alloy or copper wire.

[0060] In a second aspect, the present invention provides a method for preparing composite lead wire, which uses the above-mentioned core mold assembly for composite lead wire production.

[0061] The method includes: introducing molten alloy through the alloy inlet 201, introducing core material through the core material introduction mold core 101, the alloy entering the alloy conical channel 4, and merging with the core material from the core material introduction mold core 101, and then entering the core material coating lead layer channel 301 for coating to form a composite lead wire.

[0062] The alloy flow rate in the alloy conical channel 4 is 1.0-1.5 times, more preferably 1.0-1.2 times, and most preferably 1.1 times, of the alloy flow rate in the core material coating lead layer channel 301. If this value is too high, the wire breakage frequency will increase, and if it is too low, the quality of the composite lead wire will be affected.

[0063] For example, the alloy in the core material coated lead layer channel 301 generates a thrust of 16-22 MPa toward the outlet of the core material coated lead layer channel 301, such as 17 MPa, 18 MPa, 19 MPa, 20 MPa, or 21 MPa.

[0064] Exemplarily, the temperature of the alloy is 190-215°C, such as 195°C, 200°C, or 205°C.

[0065] Specifically, for the positive electrode composite lead wire (wire number is 2.0 mm), the temperature of the alloy is 190-210° C.; for the negative electrode composite lead wire (wire number is 1.5 mm), the temperature of the alloy is 195-215° C.;

[0066] Exemplarily, the pressure of the alloy in the alloy inlet 201 is 16-22 MPa, for example, 17 MPa, 18 MPa, 19 MPa, 20 MPa, or 21 MPa.

[0067] It can be understood that the entire production process of composite lead wire is a coordinated process of pressure, temperature and flow. When the temperature remains unchanged, high pressure will increase the flow. Under this state, the flow change will result in core deviation, broken core, and large deviation of wire number, resulting in inferior products; when the pressure remains unchanged, high temperature will also cause the flow change. Under this state, the product line surface will be uneven, with burrs, or inferior products with less than the test standard (2.0 lead wire tension ≥100N, 1.5 lead wire tension ≥90N) will appear.

[0068] Exemplarily, the lead wrapping speed is ≤80.0 m / min.

[0069] Below, the core assembly for composite lead wire production and the method for preparing composite lead wire of the present invention are further illustrated by specific examples.

[0070] Example 1

[0071] This embodiment provides a core mold assembly for producing composite lead wire.

[0072] The core mold assembly for producing composite lead wire includes an inlet mold 1, an intermediate mold 2 and an outlet mold 3. The inlet mold 1 and the outlet mold 3 are assembled and connected through the intermediate mold 2. The intermediate mold 2 is provided with an alloy inlet 201; the inlet end diameter of the core material coated lead layer channel 301 of the outlet mold 3 gradually decreases from large to small along the material flow direction, forming a tapered inlet end; the end of the core material introduction mold core 101 of the inlet mold 1 is tapered, and the cone angle is facing the outlet mold 3; the tapered end of the core material introduction mold core 101 is located inside the tapered inlet end of the outlet mold 3, and an alloy tapered channel 4 is formed between the two cones.

[0073] The inlet mold 1 includes an inlet mold base 102 and a core material introduction mold core 101, and the core material introduction mold core 101 is provided with a core material introduction channel 103 for the core material to pass through; the outlet mold 3 includes an outlet mold base 303 and an outlet mold core 302; the outlet mold 3 is provided with a core material coated lead layer channel 301; the intermediate mold 2 is an annular structure, and the inlet mold 1 and the outlet mold 3 are respectively assembled at the two ends of the intermediate mold 2, specifically, the core material introduction mold core 101 and the outlet mold core 302 are respectively assembled in the two end rings of the intermediate mold 2; a cavity is provided between the intermediate mold 2 and the core material introduction mold core 101, and the core material introduction channel 103 and the core material coated lead layer channel 301 are coaxially arranged.

[0074] The angle between the hypotenuse of the tapered end of the core material introduction mold core 101 and the horizontal line is 30 degrees; the angle between the hypotenuse of the alloy tapered channel 4 and the horizontal line is 50 degrees. The distance L between the end face of the core material introduction mold core 101 and the end of the tapered inlet end of the core material coating lead layer channel 301 is 1 / 2 the diameter of the core material coating lead layer channel 301. The projection of the hypotenuse of the tapered end of the core material introduction mold core 101 on the horizontal plane is closer to the inlet end of the inlet mold 1 than the projection of the hypotenuse of the alloy tapered channel 4 on the horizontal plane.

[0075] The alloy inlet 201 is opposite to the oblique edge of the tapered end of the core material introduction mold 101 . The middle mold 2 is provided with two alloy inlets 201 , and the two alloy inlets 201 are symmetrical about the axis of the middle mold 2 .

[0076] Example 2

[0077] This embodiment provides a method for preparing a composite lead wire, using the composite lead wire production mold core assembly of Example 1 to prepare a composite lead wire with a wire size of 1.5 mm.

[0078] The composite lead wire preparation method includes: introducing molten alloy through alloy inlet 201, introducing core material (glass fiber) through core material introduction mold core 101, and the alloy entering alloy conical channel 4. After merging with the core material from core material introduction mold core 101, the alloy enters core material coating lead layer channel 301 for coating, thereby forming the composite lead wire. The alloy flow rate in alloy conical channel 4 is 1.1 times the alloy flow rate in core material coating lead layer channel 301. The alloy in core material coating lead layer channel 301 generates a thrust of 21 MPa toward the outlet of core material coating lead layer channel 301. The alloy temperature is 200°C and the pressure is 22 MPa.

[0079] The frequency of wire breakage during the preparation of composite lead wire by this method is once per day. The wire diameter deviation of the prepared composite lead wire is 0.1 mm, the 1.5 lead wire tension is 135 N, and the surface of the composite lead wire is smooth and free of burrs.

[0080] Example 3

[0081] This embodiment provides a composite lead wire preparation method that is the same as that of Example 2, except that the angle between the hypotenuse of the alloy conical channel 4 and the horizontal line is 75 degrees.

[0082] The composite lead wire produced by this method had a wire diameter deviation of 0.4mm, exceeding the upper limit of the standard value and being a low-quality product. Furthermore, the core material broke three times per day, reducing daily production by 7kg.

[0083] Example 4

[0084] This embodiment provides a composite lead wire preparation method that is the same as that of Example 2, except that the distance L between the end face of the core material introduction mold core 101 and the end of the tapered inlet end of the core material coated lead layer channel 301 is 3 / 5 of the diameter of the core material coated lead layer channel 301.

[0085] The core material breakage frequency of this method is 2 times per day. The wire diameter deviation of the composite lead wire prepared by this method is 0.3 mm, and the daily output is reduced by 6 kg.

[0086] Example 5

[0087] This embodiment provides a composite lead wire preparation method that is the same as that of Example 2, except that the angle between the hypotenuse of the alloy conical channel 4 and the horizontal line is equal to the angle between the hypotenuse of the conical end of the core material introduction mold core 101 and the horizontal line, that is, both are 30 degrees.

[0088] The composite lead wire produced by this method had a wire diameter deviation of 0.3mm, exceeding the upper limit of product testing standards and placing it at a dangerous level. Furthermore, the core material broke three times per day, reducing daily production by 7kg.

[0089] Example 6

[0090] This embodiment provides a composite lead wire preparation method that is the same as that of Example 2, except that the alloy flow rate in the alloy conical channel 4 is 1.0 times the alloy flow rate in the core material coated lead layer channel 301.

[0091] The wire diameter deviation of the composite lead wire prepared by this method is 0.3mm, the core material breakage frequency of this method is 2 times per day, and the daily output is reduced by 6 kg.

[0092] Example 7

[0093] This embodiment provides a method for preparing a composite lead wire that is the same as that of Example 2, except that the pressure is 24 MPa.

[0094] The wire diameter deviation of the composite lead wire prepared by this method is 0.35mm, the core material breakage frequency of this method is 3 times per day, and the daily output is reduced by 7 kilograms.

[0095] Example 8

[0096] This embodiment provides a composite lead wire forming method that is the same as that of Example 2, except that the temperature is 225°C.

[0097] The surface of the composite lead wire prepared by this method is uneven and has burrs, and the tensile strength of the 1.5 lead wire is 89N.

[0098] Comparative Example 1

[0099] This comparative example uses Figure 5-Figure 7 The conventional composite lead wire production method uses a mold core assembly to produce composite lead wire. This method frequently causes wire breakage during production of composite lead wire. The core material breaks six times per day.

[0100] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A core mold assembly for composite lead wire production, characterized in that: The core die assembly for producing composite lead wire comprises an inlet die (1), an intermediate die (2) and an outlet die (3), wherein the inlet die (1) and the outlet die (3) are assembled and connected via the intermediate die (2), and the intermediate die (2) is provided with an alloy inlet (201); The diameter of the inlet end of the core material-coated lead layer channel (301) of the outlet die (3) gradually decreases along the material flow direction, forming a tapered inlet end; The end of the core material introduction mold core (101) of the inlet mold (1) is tapered, and the tapered angle faces the outlet mold (3); the tapered end of the core material introduction mold core (101) is located inside the tapered inlet end of the outlet mold (3), and an alloy tapered channel (4) is formed between the two cones.

2. The core mold assembly for composite lead wire production according to claim 1, characterized in that: The included angle between the hypotenuse of the alloy tapered channel (4) and the horizontal line is greater than the included angle between the hypotenuse of the tapered end of the core material introduction mold core (101) and the horizontal line.

3. The core mold assembly for composite lead wire production according to claim 1, characterized in that: The angle between the oblique side of the alloy tapered channel (4) and the horizontal line is 10-35 degrees greater than the angle between the oblique side of the tapered end of the core material introduction mold core (101) and the horizontal line.

4. The core mold assembly for composite lead wire production according to claim 1, characterized in that: The angle between the hypotenuse of the alloy conical channel (4) and the horizontal line is 45-65 degrees.

5. The core mold assembly for composite lead wire production according to claim 1, characterized in that: The angle between the hypotenuse of the tapered end of the core material introduction mold core (101) and the horizontal line is 30-35 degrees.

6. The core mold assembly for composite lead wire production according to claim 1, characterized in that: The distance L between the end face of the core material introduction mold core (101) and the end of the tapered inlet end of the core material coating lead layer channel (301) is 1 / 2-3 / 5 of the diameter of the core material coating lead layer channel (301).

7. The core mold assembly for composite lead wire production according to claim 1, characterized in that: The projection of the oblique edge of the tapered end of the core material introduction mold core (101) on the horizontal plane is closer to the inlet end of the inlet mold (1) than the projection of the oblique edge of the alloy tapered channel (4) on the horizontal plane.

8. The core mold assembly for composite lead wire production according to claim 7, characterized in that: The alloy inlet (201) is opposite to the oblique edge of the tapered end of the core material introduction mold (101).

9. The core mold assembly for composite lead wire production according to claim 1, characterized in that: The middle mold (2) is provided with two alloy inlets (201).

10. A method for preparing a composite lead wire, characterized in that: A core mold assembly for producing composite lead wire is used, as described in any one of claims 1 to 9.

Images