Status of the use of technology Carbide Mold
First, non-standard carbide die carbide, and a new Application Status
1. Non-standard mold blanks carbide applications of so-called non-standard is not listed in the national standards in the shaped blank. Used more in this regard is the non-magnetic die, progressive die and so on. Non-magnetic die general election YGl5 or YG2O carbide production. Such as Sichuan plant will use 899 to the system YGl5 Soft die. Jiangxi Optical Instrument Factory will use YG2O and YG2OC for soft red mirror set mode. Chong is contained in the nickel-based alloys IJ5O, the mirror parallelism "0.0O5mm, roughness Ra <0.2Um, use red containing abrasive machining efficiency techniques higher than a few times. Zigong Radio Factory with YWC a non-magnetic alloy for soft magnetic material forming die, life of 50-100 million. Both single-station or multi-station progressive die, most of the election YGl5, YG2O and YG2OC mainly, but also the election steel with gold. Such as the Shanghai Watch Factory wheel with carbide films produced by sub-combination of progressive die, at 300-400 times / min to work under the impulse speed of 216 million, producing 4 million high-precision quality products. Stator progressive die also 300 times / min rate of qualified products produced about 100 million. Nanjing Changjiang Machinery Plant of the motor stator and rotor iron core die sharpening a meeting can be washed 50 million times, with a total life of 5000-6000 million. Jiangsu Huajing Electronics Group of the carbide multi-position progressive die, in the washed-speed 400-600 times / min under the stamping lead frame material, the total life span of about 50 million times. Electrical plug-in electric motor plant in Dalian products Progressive Die in favor of domestic carbide, the useful life of more than 70 million times, time over two years. In recent years, powder metallurgy products forming mold plastic mold began to use carbide material. If YG8 forming die can be pressed to pay for every 700,000 products in steel plant only vice I000 times, high-chromium steel vice. Luzhou Changjiang Machinery Plant YG8 to do with the bi-metal sleeve shaping die, life of more than 100 square pieces, but only 1000 life expectancy GCrl5 steel.
Second, the new hard materials, the development of mold
In the development of new carbide materials, a few years ago on behalf of cobalt nickel iron hot. Development of metallurgical materials, such as Hunan Province, the equivalent of YG15, YG2O, YG25 toughness of high-strength alloy, used for cold-Tun mold, cold extrusion die and so they have received good results also in Tianjin Institute of Iron Carbide Nickel on behalf of the Co-developed a considerable GY (15-20) of the carbide die materials, standard parts of the roll forging, cold steel ball pier with YG2O, quite effective. In recent years, new research hot is fine grain, ultra-fine grain, and even nano-cemented carbide and gradient cemented carbide. Gradient carbide have compositionally graded, organizational structure, gradient, etc. There is also useful for molten metal infiltration approach to produce gradient cemented carbide, such as the gradient, etc. carbide anvil. Fine-grained and ultrafine grain cemented carbide are also available, such as the fine-grained YG8 Dies in drawn "wire less lmm when the general drawing die 3 times. In addition, there are cast-alloy hot-work tool mounted in the rolling tube and wire rolling achieved good results. Carbide blank material, made from mold in the processing, its life and some long, others very short. The anatomical analysis, found that the problem lies in the design, processing, assembly, and welding and so on.
1. Carbide mold design and technical status
Drawing module is a relatively simple structure of the mold. 80 years before the former Soviet Union, China has long adopted a "straight line" theory designing, 80 years later, some have made reference to 50 years on a "smooth transition" technical theory.
In recent years, Chinese scholars had the angle on the drawing die design and theoretical analysis of ring groove wear, made the biggest, the smallest angle of the concept of drawing, analysis of metal in the tensile deformation process of the mechanism of mold produce uneven wear. Guangdong Institute of Technology researchers in the cold pier small size screws to use carbide dies conducted an autopsy analysis resulted in domestic die life low (200-400 million) and Japan die life and high (900-1000 10000 times) where the secret The key technology is the design point of view. That Japan mold in the punch hole at the bottom and die kit, bottom center contact area using dual-convex design. Its biggest advantage is that the force can ensure that the center of pressure by the close, the gap left by another four weeks for interference fit, the storage of excess from the hole wall extrusion of metal. Shenyang bridge pier Ml2 nut factory on the cold hard alloy used in concave mold, the hexagonal design of the original provision loaded into six sets of combinations of inlay. Their average life expectancy of 500,000 / mold, a high of 120 million pieces / I believe that this design is more reasonable, first, because it is saving mode than the overall structural design of cemented carbide; Second, it assembled simple; third is the replacement die easy, replaced a damaged one can be.
2. Processing and assembly of the impact of technology on Carbide Dies
Carbide dies dimensional accuracy and geometrical accuracy is achieved by grinding. Because of the cemented carbide grinding force is in general 2-3 times that of steel grinding force. Therefore, grinding power required to be large, rigid higher on the level of China's current machines, there is no special processing of carbide grinding. Gu Chang machining error caused by the error of the cumulative effects will seriously damage mold life. In the EDM process, due to mold material subject to instantaneous discharge of up to 10000 ℃ high temperature of about the role and the role of the liquid medium will lead to changes in surface microstructure occurs, there may be carburizing (working fluid carbon), infiltration of metal (copper tungsten electrode), or even micro-cracks, will undoubtedly affect the life span. Mounting is to enable alloys can withstand a greater impact and compression loads, either hot or cold inlay inlay sets of sets, clearance requirements are very strict. Cold Mounting options generally 0.03-0.05mm in the amount of interference, Hot Mounting kits for the 0.08-0.1Omm, cavity sets of heat to take 700-800 ℃, hard alloy obtained about 300 ℃. Pressing is completed, into the 600 box-type furnace insulation 2h, to remove the stress.
Carbide is also a key technology of welding brazing of the more commonly used. Metallurgical Material Research Institute, Hunan Province, Xi'an aircraft engine manufacturing company who have developed a nickel-base brazing solder, in a vacuum furnace brazing carbide to great effect.
This information comes from [ Wishsino Plastic Mold making Company Website.]
