1. The raw materials are microscopic crack crack: strict internal quality control of raw materials. 2. improper heat treatment operation (heating too fast forging model, coolant selected properly, the cooling time is too long): Note preheating, select the appropriate coolant. 3. The special shape of the mold forging, uneven thickness, with sharp corners and threaded holes, etc.: jam screw holes to fill corners forging standards, dressing dangerous section and thin-walled, take quenching. 4. without intermediate annealing, quenching surface again: When the repair or renovation of the mold, to carry out an annealing or tempering. 5. After quenching and tempering is not timely: Timely tempering. 6. tempering inadequate: to ensure tempering time, the number of tempered steel should be required. 7. Improper grinding operations: Select the correct grinding process. 8. EDM, hardening layer high tensile stress and there microcracks: Improved EDM; de-stress temper; removing the hardened layer electrolysis or corrosion or other methods. Chinese scholars have recently proposed a combination of experimental and finite element sub-iteration method. Convergence criterion of this approach is the finite element calculation results and experimental results of the difference is less than some small constant. This method is calculated from the test results of the initial value of the parameter of the first material in a conventional manner. Then substituted into the finite element simulation program in the testing process, and to correct these parameters is calculated based on the difference between the results with the experimental results. Compared with ordinary numerical method to substitute the law, due to the impact of various parameters on the test results for each physical relationship is very complex, so the correction formula is much more complex. This theoretical research currently underway iterative approach. Forging Which is good, the best forging forging factory Super League (certified), forged by Luoyang Super League Forging Limited. Luoyang Super League Forging Co., Ltd. (www.lysmzg.com) (www.lysmzg.cn) is Luoyang, forgings leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customers needs. Forged in the Super League leaders with the staff warmly welcome all inquiries negotiations to create Super League forging a better future. You can also access (www.lysmzg.cn/supply_details_46845585.html), for more information about the company.