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| Diamond Wire Drawing die maintenance |
Wire Drawing dies in long-term use, subject to the die wall friction and strong metal wire scouring effect, which is caused by wear and tear, the most common is to appear in the work area at the entrance to the wire ring ditch watercourse (dent). Pull mode ring groove appears exacerbated wear die hole, because the ring groove because of loose and flaking of the core material into small particles by wire die hole workspace and sizing zone, acts as an abrasive, and enter wire die hole is like grinding as increased wear of the die hole. If we do not fix the exchange, then the ring groove will continue to accelerate the expansion, making the repair more difficult, there may even be a crack in the annular groove deeper, chipping the mold completely scrapped.
Learn from experience, to develop a set of standards, strengthen the routine maintenance, repair mold is often very cost-effective thing. Once the mold there are any minor wear and tear, timely polishing, then the mold is restored to its original state polishing takes shorter time, and pass no significant changes in the size of the mold.
Diamond Drawing Die repair technology will undoubtedly strengthen the life of the mold, good economic returns, can be applied to the surface of various iron-based alloys and other metal materials mold and other parts and repair and strengthening of a substantial increase in service life. The specific process clearly drawing die repair is very important.
1. Cleanup: Cleanup needs to make a simple repair to remove oil and impurities, otherwise energized and sparking phenomena in poor repair process.
2, rolling speed: the rotational speed of the welding torch to melt the pulse output current node is formed densely arranged on appropriate fill material, the rotational speed is not too fast, otherwise the repair polishing a small amount of fill material and fine pores peeling phenomenon.
3, the point of contact with the mold torch: fill material between the gun and pressed against the contact area of the smaller the better, the greater the current density through the instant (current more concentrated), the greater the heat the solder joint, combined with the degree of fill material is relatively it is good. Fill material for the housing shown in contact with power data ¦Õ5mm standard torch electrode rod and the plane fill material when power requirements, the same power horn larger contact area, the current dispersion, after the meeting is not satisfactory, on the contrary, the contact area is too small, repair the process could easily lead to melting splash fill material and the surface uneven.
Currently, foreign cable mold grinding process commonly used high-speed mechanical grinding machine and a diamond plated metal grinding, the equipment running smoothly, grinding specifications and standardized use of the product more accurate.
1 Select good pass design diamond drawing dies
2 Category pull mode of pass
(1) a longitudinal section line pass each part must be straight, flat work cone drawing force a minimum;
(2) the transfer of part of the mold each part must be clear, so that each part can give full play their respective roles, to avoid a reduction in the actual length of the transition angle sizing region;
(3) to extend the entrance area and workspace height, the wire into the middle section of the die hole work cone, the use of the wedge on the entry cone angle and working cone angle half portions, to establish a "wedge effect" on the wire surface is more compact solid lubricating film, reducing wear and suitable for high-speed drawing;
(4) sizing area must be flat and reasonable length. Sizing zone too long, cable friction increases, pulled out after the wire die hole can lead to necking or disconnection, sizing area is too short, it is difficult to obtain a stable shape, size, accuracy and good surface quality of the wire, but also die hole will soon wear tolerance.
3 drawing die machine equipment installation to be reasonable
(1) Installed base drawing machine needs very strong, avoid vibration phenomena;
(2) To debug the wire by stretching axis of symmetry of the mold installation center line, the wire and cable model stress uniformity;
(3) Pull the process to avoid frequent start stop, the tensile stress due to friction caused by pulling the start of friction than normal when the drawing is much greater, which is bound to increase the wear of the mold.
4 for drawing a wire to pretreated
(1) surface preparation: the surface dirt, impurities adhered more wire, after first washing, drying and then be drawn; the more the wire surface oxide scale, first through the thin acid, bake dry and then be drawn; for the presence of surface skin, pits, re-skin phenomena such as wire, but also through the grinder after grinding were conducted drawing;
(2) Heat treatment: For the hardness is too large or uneven hardness of the wire, first reduce the hardness by annealing or tempering, wire and maintain good hardness uniformity further drawing.
5 maintain the appropriate drawing surface shrinkage
Diamond wire drawing dies mold itself has a hard, brittle properties, if for Omo shrinkage necking drawing, can easily lead to mold can withstand stress fracture scrapped, and therefore depending on the mechanical properties of the wire, choose the right side shrinkage were drawn. Stainless steel wire drawing diamond die, usually single-channel surface shrinkage does not exceed 20%.
6 Use good lubrication performance lubricants
In the drawing process, the supply of quality lubricants and lubricant are affecting the adequacy of the cable model of life. Thus requiring the lubricant base oil stability, good oxidation resistance, with excellent lubrication, cooling and cleaning of the entire production process has always been to maintain the best state of lubrication, so as to form a layer to withstand high pressure without being destroyed of the film to reduce the friction of the work area, to improve the life of the mold.
Course, we must continue to observe the condition of lubricating oil, lubricating oil, if found severe discoloration or metal powder increases, should be promptly replaced or filtered, to avoid lubricating oil lubrication performance degradation due to oxidation, while avoiding the process of drawing off small metal particles mold damage.
7 regular maintenance grinding diamond wire drawing dies
Cable model in the long-term use, subject to the die wall friction and strong metal wire scouring effect, which is caused by wear and tear, the most common is the emergence of an annular groove Caojing (dents) in the wire entrance of the work area.
Learn from experience, to develop a set of standards, strengthen the routine maintenance, repair mold is often very cost-effective thing. Once the mold there are any minor wear and tear, timely polishing, then the mold is restored to its original state polishing takes shorter time, and pass no significant changes in the size of the mold. |
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