The competition in the manufacturing industry around the world is becoming more and more fierce. The ability of companies to provide customers with personalized and high-quality products in the shortest possible time with high efficiency and low consumption has become a symbol of corporate competitiveness.
The quality of Tungsten carbide Die will directly affect product quality, output, cost, the cycle of new products being put into production and old products replacement, the speed of corporate product structure adjustment and market competitiveness, so the economic situation puts forward a greater The higher the requirements come. How to improve the quality of molds more reasonably is the key to the leap of the manufacturing industry. How can the mold be able to produce qualified parts for a longer time and more mold times under the conditions of high precision, low cost and high efficiency? This has increasingly become the focus of attention.
Mold quality includes the following aspects:
⑴Product quality: product size stability, compliance, product surface finish, product material utilization rate, etc.;
⑵Service life: under the premise of ensuring product quality, the number of work cycles that the mold can complete or the number of parts produced;
⑶The use and maintenance of the mold: whether it is the most convenient to use, easy to demould, and the production auxiliary time as short as possible;
⑷Maintenance cost, maintenance periodicity, etc.
The basic way to improve the quality of tungsten steel mold:
⑴ The design of the part should be reasonable, and the best structural plan should be selected as far as possible. The designer of the part should take into account the technical requirements of the part and the process and feasibility of mold manufacturing.
⑵The design of the mold is the most important step to improve the quality of the mold. Many factors need to be considered, such as the selection of mold materials, the usability and safety of mold structure, the machinability of mold parts and the convenience of mold maintenance. At the beginning of the design, it should be considered as thorough as possible. ①The selection of mold materials must not only meet the customer's requirements for product quality, but also consider the cost of the material and its strength within the set period. Of course, it must also be based on the type of mold, working method, processing speed, and main failures. Factors such as form to select materials. For example: the main failure mode of the punching die is the wear of the cutting edge, it is necessary to choose a material with high surface hardness and good wear resistance; the punching die is mainly subjected to periodic loads, which is easy to cause surface fatigue cracks and cause surface peeling, then choose Materials with good surface toughness; drawing dies should choose materials with particularly low friction coefficient; die-casting moulds should be selected from materials with strong thermal fatigue due to cyclic thermal stress; for injection moulds, when the plastic parts are abs, pp, pc For such materials, the mold material can be pre-hardened quenched and tempered steel. When the plastic parts are high-finish and transparent materials, corrosion-resistant stainless steel can be selected. When the product batch is large, quenched and tempered steel can be selected. In addition, it is also necessary to consider the use of mold materials with less affinity with the parts to prevent mold sticking from aggravating the wear of mold parts, thereby affecting the quality of the mold. ②When designing the mold structure, try to be as compact as possible and easy to operate, and ensure that the mold parts have sufficient strength and rigidity; when the mold structure allows, the corners of the mold parts should be designed as rounded transitions as much as possible to avoid stress concentration ; For the concave mold, cavity and part of the punch and core, a combination or inlay structure can be used to eliminate stress concentration. For the slender punch or core, appropriate protective measures must be taken in the structure; for the cold die, it should be Equipped with devices (such as ejector pins, compressed air, etc.) to prevent clogging of parts or waste materials. At the same time, it is also necessary to consider how to reduce the impact on mold quality caused by the wear of sliding fittings and frequent impact parts during long-term use. ③In the design, it is necessary to reduce the scope of disassembly and assembly when repairing a certain part, especially when replacing vulnerable parts, as far as possible to reduce the scope of disassembly and assembly.
⑶The mold manufacturing process is also an important part of ensuring the quality of the mold. The processing method and processing accuracy in the mold manufacturing process will also affect the service life of the mold. The accuracy of each part directly affects the overall assembly of the mold. In addition to the accuracy of the equipment itself, it is necessary to improve the processing method of the parts and improve the technical level of the fitter in the mold grinding process to improve the processing accuracy of the mold parts ; If the overall assembly effect of the mold does not meet the requirements, the probability of making the mold move in an abnormal state in the trial mold will increase, which will have a great impact on the overall quality of the mold. Mold industry expert Luo Baihui pointed out that in order to ensure that the mold has good original precision—the quality of the original mold, a reasonable high-precision processing method must be selected first in the manufacturing process, such as EDM, wire cutting, CNC machining, etc., and attention should be paid to the mold The precision inspection includes the machining accuracy of mold parts, assembly accuracy and comprehensive inspection of mold accuracy through mold trial acceptance work. During inspection, high-precision measuring instruments should be selected as much as possible. For those mold parts with complex surface and curved structures, if Accurate measurement data cannot be achieved with ordinary rulers and vernier cards. At this time, precise measurement equipment such as a three-coordinate measuring instrument must be selected to ensure the accuracy of the measurement data.
⑷Surface strengthening of the main forming parts of the mold to improve the surface wear resistance of the mold parts, so as to better improve the quality of the mold. For surface strengthening, different strengthening methods should be selected according to different use molds. For example: the blanking die can be strengthened by electric spark, cemented carbide surfacing, etc., to improve the wear resistance and compressive strength of the surface of the mold parts; die-casting molds, plastic molds and other hot-processed mold steel parts can be nitrided (hard nitrogen Chemical) treatment to improve the wear resistance, heat fatigue resistance and corrosion resistance of the parts; drawing dies and bending dies can be treated with sulfur to reduce the friction coefficient and improve the wear resistance of the material; carbonitriding (Soft nitriding) can be applied to the surface strengthening treatment of various molds. In addition, a technology called fcva vacuum diamond coating developed in recent years can form a very strong, smooth, uniform and dense protective film on the surface of the part. This technology is particularly suitable for mold surface protection. Treatment is also an effective way to improve the quality of molds. Of course, if the part is a trial product or the production batch is quite small, the surface strengthening treatment of the mold part is not necessary.
⑸ The correct use and maintenance of molds is also a major factor in improving mold quality. For example: the installation and debugging method of tungsten steel mold should be appropriate. In the case of hot runner, the power supply connection should be correct, the cooling water circuit should meet the design requirements, and the parameters of the injection molding machine, die casting machine, and press in the production of the mold need and design requirements Match and so on. When the mold is used correctly, it is necessary to perform regular maintenance on the mold. The guide post, guide sleeve and other parts of the mold should be filled with lubricating oil frequently. For forging molds, plastic molds, die-casting molds, etc. Lubricant or release agent should be sprayed on the surface of the molded part before molding. The planned protective maintenance of the mold and the data processing in the maintenance process can prevent possible problems in the mold production and improve the efficiency of maintenance work. Luo Baihui believes that if we want to improve the quality of molds, we must first consider the impact on mold quality in every link, and secondly, we must cooperate with all departments. The quality of the mould is the true embodiment of the mould enterprise's own strength.
Quality is an old and often new topic! The quality of the mold, whether it is the designer and manufacturer of the mold, the designer of the part, or the user of the mold, should be actively concerned about the problem. With the continuous innovation of technology, the widespread adoption of new materials, and the continuous transformation of processing technology , Use and maintenance conditions, etc., affect the quality of the mold to varying degrees.
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