A wire drawing die and a processing method thereof

Abstract

The application discloses a wire drawing die and a processing method thereof, relates to the technical field of wire drawing dies, and aims to solve the technical problem of positioning precision during processing. The technical scheme is as follows: one end of the die sleeve is provided with a taper-shaped feeding groove, the die core and the sintered body are arranged in a groove, the die cover is provided with a discharging groove and is arranged on the top of the groove, a closed cavity is formed between the die core and the die cover inside the groove, the sintered body is arranged in the closed cavity, the sintered body is formed by sintering of metal mixed powder, a taper-shaped first guide ring is arranged on the side of the feeding groove at the bottom of the groove, the end of the guide ring is provided with a first positioning ring along the side thereof, the die core is provided with a material guiding groove penetrating through both ends of the die core, and the end of the material guiding groove is provided with a first positioning groove for the first positioning ring to be inserted along the inner wall of the material guiding groove. The application aims to provide a wire drawing die and a processing method thereof.

Description

Technical Field

[0001] This invention relates to the field of wire drawing die technology, and more specifically, to a wire drawing die and its processing method. Background Technology

[0002] Wire drawing dies have a wide range of applications. High-precision wires used in electronic devices, radar, television, instruments, and aerospace, as well as commonly used tungsten wire, stainless steel wire, electrical cable wire, and various metal wires, are all drawn using diamond wire drawing dies. Because diamond wire drawing dies use natural diamond as raw material, they possess extremely high wear resistance and a very long service life. The manufacturing process of wire drawing die inserts includes several steps such as die pressing, drawing, and turning.

[0003] The existing wire drawing die sleeve installation process requires the die core to be precisely placed inside the die sleeve, and a sintering process is used to form a sintered body inside the die sleeve to fix the die sleeve and the die core. During the processing, the position of the die core is manually adjusted, making it difficult to control the accuracy of the die core installation position, resulting in a low final yield.

[0004] Therefore, a new technical solution is urgently needed to solve the above-mentioned technical problems. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a wire drawing die and its processing method.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a wire drawing die, comprising a die sleeve, a die core, and a die cover, wherein one end of the die sleeve is provided with a conical feed groove, and the other end of the die sleeve is provided with a groove communicating with the feed groove, the die core and a sintered body are disposed in the groove, the die cover is provided with a discharge groove and is disposed at the top of the groove, a sealed cavity is formed inside the groove between the die core and the die cover, the sintered body is disposed in the sealed cavity, the sintered body is formed by sintering metal mixed powder, a conical first guide ring is provided at the bottom of the groove on the periphery of the feed groove, a first positioning ring is provided at the end of the guide ring along its periphery, the die core is provided with a guide groove penetrating both ends thereto, and a first positioning groove for the first positioning ring to be inserted is provided at the end of the guide groove along its inner wall.

[0007] By adopting the above technical solution, during production and processing, the die sleeve, die core, and die cover are produced in batches separately and then assembled. By filling the sealed cavity with metal mixed powder and sintering, the wire drawing die can be quickly assembled and produced. During assembly, when the die core is placed inside the groove, the first positioning ring is simply inserted into the corresponding first positioning slot to quickly install and position the die core. This ensures the accuracy of the die core installation position and prevents it from shifting during processing, thus guaranteeing the yield rate of the final product.

[0008] The present invention is further configured such that: a tapered second guide ring is provided at the end of the mold cover facing the inside of the groove along the periphery of the discharge groove; a second positioning ring is provided at the end of the second guide ring along its periphery; and a second positioning groove for the second positioning ring to be inserted is provided at the other end of the guide groove along its inner wall.

[0009] The present invention is further configured such that: an annular groove is formed at the bottom of the inner wall of the groove along its circumferential direction, and a connecting ring that fits into the annular groove is provided on the circumferential side of the sintered body.

[0010] The present invention is further configured such that: the inner wall of the groove is provided with a plurality of limiting grooves that communicate with the annular groove and penetrate through the end of the mold sleeve, and the side wall of the sintered body is provided with a limiting strip located in the limiting groove.

[0011] The present invention is further configured such that: the side wall of the mold cover is provided with a sealing block that is inserted into the limiting groove.

[0012] The present invention is further configured such that: a snap-fit ​​ring is provided on the surface of the mold cover facing the groove along its circumferential direction, and a snap-fit ​​groove matching the shape of the snap-fit ​​ring is formed on one end surface of the sintered body.

[0013] A processing method for any of the above-mentioned wire drawing dies includes the following steps:

[0014] 1) Place the mold core in the center of the groove and insert the first positioning ring into the first positioning groove;

[0015] 2) According to the specifications of the mold sleeve, mold core and mold cover, pour the specified mass of metal mixed powder into the groove;

[0016] 3) Place the mold cover on top of the groove and press it with a weight to compact the metal mixture powder;

[0017] 4) Place the wire drawing die to be formed in step 3) into a graphite mold, add a graphite pressure head, place it on a hot press sintering machine, heat it to 590-600 degrees Celsius, press it to 4-5 atmospheres, and hold it for 13-15 minutes.

[0018] 5) The hot pressing sintering machine exits the sintering program. The pre-mold of the metal wire drawing die is randomly and naturally cooled to 370-390 degrees Celsius. The hot pressing sintering machine completes all the programs, removes the graphite mold, and allows it to cool naturally to room temperature. Open the graphite mold and remove the formed wire drawing die.

[0019] The present invention is further configured such that the basic composition of the metal mixed powder formulation is as follows (by weight):

[0020] Nickel - 33%; Copper - 20%; Manganese - 10%; Tin - 18%; Tungsten - 17%; Silicon - 2%.

[0021] The present invention is further configured such that, in step 2, a specified mass of each metal powder is placed into a mixer and stirred for 1.5-2 hours.

[0022] The present invention has the following beneficial effects: During production and processing, by producing the mold sleeve, mold core and mold cover separately in batches, and then assembling them in the subsequent process, and by filling the sealed cavity with metal mixed powder and sintering, the wire drawing die can be quickly assembled and produced. During assembly, when the mold core is placed inside the groove, the first positioning ring is simply inserted into the corresponding first positioning groove to quickly install and position the mold core, ensuring the accuracy of the mold core installation position and preventing it from shifting during processing, thus ensuring the yield of the final product. Attached Figure Description

[0023] Figure 1 This is a cross-sectional structural diagram of this embodiment;

[0024] Figure 2 This is a partial cross-sectional schematic diagram of the mold in this embodiment;

[0025] Figure 3 This is a schematic cross-sectional view of the mold core in this embodiment;

[0026] Figure 4 This is a partial cross-sectional view of the mold cover in this embodiment;

[0027] Figure 5 This is a schematic diagram of the three-dimensional structure of the sintered body in this embodiment.

[0028] Figure descriptions: 1. Mold sleeve; 2. Mold core; 3. Mold cover; 4. Feed groove; 5. Groove; 6. Discharge groove; 7. Sintered body; 8. First guide ring; 9. First positioning ring; 10. Feed guide groove; 11. First positioning groove; 12. Second guide ring; 13. Second positioning ring; 14. Second positioning groove; 15. Annular groove; 16. Connecting ring; 17. Limiting groove; 18. Limiting strip; 19. Sealing block; 20. Snap-fit ​​ring; 21. Snap-fit ​​groove. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings.

[0030] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific part, respectively.

[0031] As shown in the figure, a wire drawing die includes a die sleeve 1, a die core 2, and a die cover 3. One end of the die sleeve 1 has a conical feed groove 4, and the other end has a groove 5 that communicates with the feed groove 4. The die core 2 and a sintered body are disposed in the groove 5. The die cover 3 has a discharge groove 6 and is disposed at the top of the groove 5. The interior of the groove 5 forms a sealed cavity between the die core 2 and the die cover 3. The sintered body 7 is disposed in the sealed cavity. The sintered body 7 is formed by sintering metal mixed powder. The bottom of the groove 5 is provided with a conical first guide ring 8 on the periphery of the feed groove 4. The end of the first guide ring 8 is provided with a first positioning ring 9 along its periphery. The die core 2 has a guide groove 10 that passes through both ends. The end of the guide groove 10 has a first positioning groove 11 along its inner wall for the first positioning ring 9 to be inserted.

[0032] During production, the die sleeve 1, die core 2, and die cover 3 are produced in batches separately and then assembled. By filling the sealed cavity with metal mixed powder and sintering, the wire drawing die can be quickly assembled and produced. During assembly, when the die core 2 is placed inside the groove 5, the first positioning ring 9 is simply inserted into the corresponding first positioning groove 11 to quickly install and position the die core 2. This ensures the accuracy of the die core 2's installation position and prevents it from shifting during processing, thus guaranteeing the yield of the final product.

[0033] A tapered second guide ring 12 is provided at the end of the mold cover 3 facing the inside of the groove 5 along the periphery of the discharge groove 6. A second positioning ring 13 is provided at the end of the second guide ring 12 along its periphery. A second positioning groove 14 for the second positioning ring 13 to be inserted is provided at the other end of the guide groove 10 along its inner wall. After the metal mixture powder is poured into the groove 5, the mold cover 3 is placed on top of the groove 5 and pressed against the surface of the metal mixture powder. By pressing the mold cover 3, the metal mixture powder in the groove 5 is compacted, and at the same time, the positioning ring is inserted into the second positioning groove 14.

[0034] An annular groove 15 is formed along the circumferential direction at the bottom of the inner wall of the groove 5, and a connecting ring 16 that fits into the annular groove 15 is provided on the circumference of the sintered body 7. Several limiting grooves 17 are formed on the inner wall of the groove 5, which communicate with the annular groove 15 and pass through the end of the mold sleeve 1. Limiting strips 18 located in the limiting grooves 17 are provided on the side wall of the sintered body 7. When metal mixed powder is filled into the groove 5, the powder enters the annular groove 15 and the limiting grooves 17. After sintering, the connecting ring 16 located in the annular groove 15 and the limiting strip 18 located in the limiting groove 17 are formed, which can effectively improve the stability between the sintered body 7 and the mold sleeve 1.

[0035] The side wall of the mold cover 3 is provided with a sealing block 19 that fits into the limiting groove 17. When the mold cover 3 is installed, it seals the limiting groove 17, thereby sealing the sealed cavity and further ensuring the compaction of the metal mixed powder.

[0036] A snap-fit ​​ring 20 is provided on the surface of the mold cover 3 facing the groove 5 along its circumferential direction. A snap-fit ​​groove 21 that matches the shape of the snap-fit ​​ring 20 is opened on one end surface of the sintered body 7. When the mold cover 3 is installed, the metal mixed powder enters into the snap-fit ​​groove 21. After sintering, a snap-fit ​​ring 20 is formed that is snapped into the snap-fit ​​groove 21, thereby improving the stability of the connection between the sintered body 7 and the mold cover 3, further improving the overall connection strength between the mold sleeve 1, the sintered body 7 and the mold cover 3, and ensuring the final product quality of the wire drawing die.

[0037] A processing method for the above-mentioned wire drawing die includes the following steps:

[0038] 1) Place the mold core 2 at the center of the groove 5 and insert the first positioning ring 9 into the first positioning groove 11;

[0039] 2) According to the specifications of mold sleeve 1, mold core 2, and mold cover 3, take a certain mass of metal mixed powder. The basic composition of the metal mixed powder formula is as follows (by weight): nickel - 33%; copper - 20%; manganese - 10%; tin - 18%; tungsten - 17%; silicon - 2%. Put the specified mass of each metal powder into a mixer and stir for 1.5-2 hours. Then, pour the stirred metal mixed powder into the groove 5.

[0040] 3) Place the mold cover 3 on top of the groove 5 and press it with a weight to compact the metal mixture powder, so that the second positioning ring 13 is inserted into the second positioning groove 14.

[0041] 4) Place the wire drawing die to be formed in step 3) into a graphite mold, add a graphite pressure head, place it on a hot press sintering machine, heat it to 590-600 degrees Celsius, press it to 4-5 atmospheres, and hold it for 13-15 minutes.

[0042] 5) The hot pressing sintering machine exits the sintering program. The pre-mold of the metal wire drawing die is randomly and naturally cooled to 370-390 degrees Celsius. The hot pressing sintering machine completes all the programs, removes the graphite mold, and allows it to cool naturally to room temperature. Open the graphite mold and remove the formed wire drawing die.

[0043] The specific embodiments are merely illustrative of the present invention and are not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A wire drawing die, comprising a die sleeve (1), a die core (2), and a die cover (3), characterized in that: One end of the mold sleeve (1) is provided with a conical feed groove (4), and the other end of the mold sleeve (1) is provided with a groove (5) that communicates with the feed groove (4). The mold core (2) and the sintered body are disposed in the groove (5). The mold cover (3) is provided with a discharge groove (6) and is disposed at the top of the groove (5). The interior of the groove (5) is located between the mold core (2) and the mold cover (3) to form a sealed cavity. The sealed cavity is provided with a sintered body (7). The sintered body (7) is formed by sintering metal mixed powder. The bottom of the groove (5) is provided with a conical first guide ring (8) on the periphery of the feed groove (4). The end of the first guide ring (8) is provided with a first positioning ring (9) along its periphery. The mold core (2) is provided with a guide groove (10) that runs through both ends of the mold core (2). The end of the guide groove (10) is provided with a first positioning groove (11) along its inner wall for the first positioning ring (9) to be inserted. The bottom of the inner wall of the groove (5) is provided with an annular groove (15) along its circumferential direction, and the circumferential side of the sintered body (7) is provided with a connecting ring (16) that fits into the annular groove (15). The inner wall of the groove (5) is provided with several limiting grooves (17) that are connected to the annular groove (15) and pass through the end of the mold sleeve (1). The side wall of the sintered body (7) is provided with a limiting strip (18) located in the limiting groove (17).

2. The wire drawing die according to claim 1, characterized in that: The end of the mold cover (3) facing the inside of the groove (5) is provided with a tapered second guide ring (12) along the periphery of the discharge groove (6). The end of the second guide ring (12) is provided with a second positioning ring (13) along its periphery. The other end of the guide groove (10) is provided with a second positioning groove (14) for the second positioning ring (13) to be inserted along its inner wall.

3. A wire drawing die according to claim 2, characterized in that: The side wall of the mold cover (3) is provided with a sealing block (19) that can be inserted into the limiting groove (17).

4. A wire drawing die according to claim 1, characterized in that: The mold cover (3) has a snap ring (20) on its circumferential direction facing the groove (5), and a snap groove (21) matching the shape of the snap ring (20) is opened on one end surface of the sintered body (7).

5. A method for processing a wire drawing die, used on a wire drawing die as described in any one of claims 1-4, characterized in that, Includes the following steps: 1) Place the mold core (2) at the center of the groove (5) and insert the first positioning ring into the first positioning groove; 2) According to the specifications of the mold sleeve (1), mold core (2) and mold cover (3), pour the specified mass of metal mixed powder into the groove (5); 3) Place the mold cover (3) on top of the groove (5) and press it with a weight to compact the metal mixture powder; 4) Place the wire drawing die to be formed in step 3) into a graphite mold, add a graphite pressure head, place it on a hot press sintering machine, heat it to 590-600 degrees Celsius, press it to 4-5 atmospheres, and hold it for 13-15 minutes. 5) The hot pressing sintering machine exits the sintering program. The pre-mold of the metal wire drawing die is randomly and naturally cooled to 370-390 degrees Celsius. The hot pressing sintering machine completes all the programs, removes the graphite mold, and allows it to cool naturally to room temperature. Open the graphite mold and remove the formed wire drawing die.

6. The processing method of a wire drawing die according to claim 5, characterized in that: The basic composition of the metal mixed powder formulation is as follows (by weight): Nickel -33%; Copper -20%; Manganese -10%; Tin -18%; Tungsten -17%; Silicon -2%.

7. The processing method of a wire drawing die according to claim 6, characterized in that: In step 2), the specified mass of each metal powder needs to be placed into a mixer and stirred for 1.5-2 hours.

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