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For a long time, the drawing of large-diameter metal wires has been a problem that has plagued the development of the industry. At present, the drawing of large-diameter wire rods mainly uses hard alloy wire drawing dies. However, the limitations of the materials themselves, such as fast running speed, non-repeatable mold repair, and poor uniformity of wire materials, make wire rod manufacturers more and more urgent. Polycrystalline diamond (PCD) wire drawing dies can replace hard alloys. However, the world's largest PCD drawing die blank is available only from Sumitomo, Japan, and because of its high price, many end customers are discouraged. The domestic drawing die production enterprises based on the domestic six-sided top press have not been able to solve this problem, mainly for the following reasons:
1. The size of the PCD drawing die blank is limited by the synthesis cavity. This problem is particularly prominent because the size of the domestic six-sided presser is smaller than that of the foreign two-face press.
2. Due to the large size of the PCD wire drawing die, ensuring the consistency of performance of the various parts of the blank is a challenging task;
3. Due to the large size of PCD drawing die blank, it has extremely strict requirements on the whole process flow. The slight deviation of each parameter will cause problems such as cracking, delamination, surface over-burning and internal non-sintering of the blank.
In general, the PCD blank used for drawing large-diameter metal wires is supported by a hard alloy, that is, a polycrystalline diamond core is inlaid into a hard alloy mold sleeve by a special process, so that Withstand greater tension, it can be used to make large-diameter blanks and draw thicker diameter wires.
In response to the above problems, Sifangda has repeatedly tested and successfully developed the "Big Mac" series of PCD drawing blanks for drawing large-size wires. At present, the giant giant polycrystalline diamond drawing die blank produced by Sifangda Company has been appraised by scientific and technological achievements. The technical achievements have reached the international advanced level, and the die blank (outer diameter of the carbide ring) is the largest through the customer's use and continuous purchase. Up to 67mm, PCD core diameter up to 40mm, thickness up to 25mm. This kind of products can be produced only by Sumitomo Electric Co., Ltd. and Sifangda Company in the world. However, compared with its own intellectual property rights, Sifangda Company is based on the domestic six-sided top press, so the technical difficulty is greater, and the price is more reasonable. Higher, it can completely replace the drawing of carbide drawing die blanks in the field of large-size wire and replace imported products. At the same time, the birth of this series of products makes Sifangda's series specifications more complete, and can provide high-end series, different diamond particle size (1-50μm), metal-based/ceramic-based thermal stability series and other series of products to meet different customer needs. Pulling in hard wire, cord, large diameter wire, etc. 
Abstract For a long time, the drawing of large-diameter metal wire is a problem that has plagued the development of the industry. At present, the drawing of large-diameter wire rods mainly uses hard alloy wire drawing dies, but the limitations of the material itself, such as fast running speed, non-repeatable mold repair, poor uniformity of wire...