Overview of the development of the hottest precisi

2022-10-12
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Overview of the development of precision progressive dies

from the review and recommendation of the national new product project of molds and the review of the "precision die Award" of the 13th China International Mold Exhibition in 2010, it can be seen that in recent years, China's mold technology has developed rapidly, the overall level of molds has been greatly improved, and the medium and high-end molds, mainly represented by large-scale, precision, complex, efficient and long-life molds, have reached a new level. Taking stamping dies as an example, the products of stamping dies, which account for 40% of the total domestic die production, cover the range of automotive, electronics, communications, machinery, electrical engineering, strengthening technical consultation and servers, instruments and appliances, and have a strong momentum of development in the fields of automotive lightweight, new energy, automation equipment, medical devices, aerospace, energy conservation and emission reduction. Among them, large-scale precision complex stamping dies and precision multi station progressive dies, which represent advanced stamping die technology, are the mainstream. Not only the number has increased, but also the product level has been significantly improved

from the level analysis of large-scale precision complex stamping dies and precision multi station progressive dies manufactured in China, significant progress has been made in die structure, manufacturing accuracy, service life, performance, technical content and manufacturing cycle. Among them, the gap between the service life and main performance of most molds and the international advanced level is becoming smaller and smaller. The overall level of some high-end and high-quality molds is equivalent to the international advanced level, which not only completely replaces imports, but also exports some molds to industrial developed countries and regions

Φ 110 air conditioning compressor motor iron core automatic riveting three row progressive die (upper die, lower die)

precision multi position progressive die is leading in domestic development

precision multi position progressive die, which reflects the advanced level of stamping die technology, has the characteristics of complex structure, great technical difficulty, high manufacturing precision, long die life and high production efficiency, high added value, high price, so it is one of the key categories of molds to be developed. Precision multi position progressive die mainly includes: automatic Lamination progressive die of motor iron core, progressive die of air conditioner fin, progressive die of integrated circuit lead frame, progressive die of connecting devices and connectors, progressive die of color tube electron gun parts, progressive die of automobile parts and progressive die of home appliance parts, etc. This kind of progressive die is widely used, has a large market demand, and the localization effect of the die is obvious. It is the die category that is most promising to catch up with the international advanced level

(1) the automatic Lamination progressive die for motor iron core, represented by the integration of electromechanical technology, has the technical functions of automatic stamping, lamination, twisting groove, grouping, rotation and so on. It is directly punched into the products of iron core combination, replacing the single-chip production of stator and rotor. In recent years, with the demand of high productivity and the development of technology, the technical functions of molds have developed in an all-round way. The large-scale automatic lamination of iron core, double row straight groove lamination of iron core, three row twisted groove lamination of iron core, double rotation lamination of iron core and double row large rotation automatic lamination of iron core can be manufactured by domestic motor mold backbone enterprises, and the mold level is equivalent to that of similar international molds. Among them, some high-end and high-quality molds have been close to the advanced level of similar international molds, replacing imported molds. For example, made by Ninghai Hongda motor mould Co., Ltd Φ 110 air conditioning compressor motor iron core automatic riveting three row progressive die, overall dimension 1850 × eight hundred × 480mm, with manufacturing accuracy of 2 μ m. The die is used on a 300 ton high-speed punch, with a punching speed of more than 300 strokes/min, and a die life of more than 150million strokes. The technical function of the die is to realize three rows of laminations with an outer diameter of 110mm for the stator core, three rows of twisted groove laminations with an outer diameter of 70mm for the rotor core, and the thickness of the combination of the iron core is 105mm

(2) the progressive die for air conditioning fins, represented by high efficiency and long life, includes 12, 24, 36, 42, 48, 60 and 72 rows of the first mock examination. The die life reaches hundreds of millions of strokes, reflecting the characteristics of long die life and high production efficiency. The fin progressive die covers the fins of household air conditioners, automotive air conditioners, industrial air conditioners, radiator fins of large refrigerators, integral through tube air conditioners, and new shaped hole high-efficiency air conditioners. Mold technology has been in line with international standards, and the mold level is equivalent to that of similar international molds. Some of the high-end and high-quality molds are close to the advanced level of similar molds in the world. For example, the 36 row progressive die of the first mock examination manufactured by Wuxi Guosheng Precision Die Co., Ltd. has a die life of more than 400million punching times and the progressive die of heat sink of large cold storage. It can punch aluminum and steel heat sink of two different materials respectively, and can also freely adjust the flanging height of more than 10mm. It is in the leading position in China in terms of production scale and technical level. Made by Sanjia Yihua Co., Ltd Φ seven point two × Taking 60 row fin progressive die as an example, the die includes drawing, punching, punching louvers, flanging, special-shaped cutting in the middle of the end, edge cutting, longitudinal cutting, transverse cutting and other steps. Manufacturing accuracy reaches 2 μ m. The die is used on a high-speed punch, with a punching speed of more than 260 strokes/min and a die life of more than 300million strokes

36 row progressive die pattern of air conditioning fins

(3) progressive die of integrated circuit lead frame representing high performance level, mainly including integrated circuit frame, transistor frame and discrete device frame. The die is used on high-speed punch to punch copper strip with material thickness of 0.02mm, and the lead frame is formed by automatic stamping. As the carrier of high-performance semiconductors and integrated circuits, the lead frame is characterized by a large number of legs, small leg spacing and high precision. The punched products are required to be free of burrs at the coating. At present, among the self-developed lead frame mold products in China, the number of lead legs is up to 128, the spacing size is only 0.09mm, and the frame with the largest number of rows has reached 8 rows. The mold level is equivalent to that of similar international molds. For example, the lqp48l lead frame progressive die manufactured by Xiamen teke Mold Industry Co., Ltd. has 37 stations and the manufacturing accuracy reaches 2 μ m. Mold 3 rows, at 12 × 48 inner and outer lead legs are punched within 12mm, with a minimum spacing of 0.12mm, and the flatness of the product is within 0.01mm. Its high-speed batch production performance and service life are not inferior to those of similar international molds. The 35 position progressive die for the lead frame manufactured by Xiamen Yonghong technology company, the 46 position multi row and multi row progressive die for the lead frame manufactured by Beijing Kangdi Purui, and the 64 leg progressive die for the integrated circuit lead frame manufactured by Zhejiang Huajin company have solved the technical problems of blanking with a large number of legs, small spacing and high precision, and the die level is equivalent to the international level

(4) connectors represented by precision and complexity are generally equipped with progressive dies for connectors with elastic modulus, including connectors, brush parts, electrical terminals, spring sheets and other molds. These molds have complex structures, difficult design and manufacturing, and high precision requirements. Its products are characterized by small size, many curved surfaces, complex shape and high precision. In recent years, with the improvement of market requirements and mold level, there are more and more high-precision micro products, which promotes the mold level to a new level. For example, the progressive die for high-precision micro connector parts manufactured by Jiangsu Huafu Electronics Co., Ltd. has a punching speed of more than 2500 strokes/min on the high-speed punch, and the die life is close to the advanced level of similar international dies. Wuxi Guosheng newly developed 0.4mm spacing high-precision micro connector progressive die, with manufacturing accuracy of 0.5 μ m. The minimum punch size is only 0.13MM, and the direct grinding process is adopted to achieve the mirror surface, which ensures the minimum pin position of the product is 0.17mm and the S-shaped bending accuracy is within 0.01mm. Its high-speed mass production of mold performance and mold life are close to the international advanced level of similar molds. The progressive die for electrical terminals manufactured by Wuxi Weiyan Manufacturing Co., Ltd. realizes the forming, thinning and 90 ° torsion of 8 small spacing plug-in points of products, and the service life of the die is more than 200million times. The overall level of moulds is equivalent to that of similar moulds in the world

(5) the progressive die of color tube electron gun parts, which reflects the high difficulty of forming, mainly includes the progressive die of color tube electron gun G3 cap, G3 bottom, G5 cap, G5 bottom and G1 diaphragm parts, with a manufacturing accuracy of 2 μ m。 Take the progressive die for G1 diaphragm parts as an example. The die is used on a high-speed punch to punch 0.33mm thick iron nickel alloy strip. After automatic stamping, G1 diaphragm parts are formed, with an accuracy of 5 μ Within m, the size of three small square holes is only 0.55mm, and multiple convex ribs are thinned to form. The material thickness is thinned to 0.1mm, and the forming size and plane accuracy are required to be less than 5 μ m. The parts are not only complex in shape and high in accuracy, but also require zero defects in shape quality, and the die life is more than 30million times. Then take the G5 bottom improved part mold as an example, 25 stations, including punching incision, punching unfolding contour, deep drawing, rib pressing, trimming, flanging, thinning deep drawing, shaping, fine punching small holes and other stations. The punching material is 0.245mm thick non-magnetic non steel strip, and the service life of the die is up to 50million punching times. Due to the complex shape of color tube electronic grab parts, the requirements for dimensional accuracy, geometric tolerance and shape quality are very high, so the requirements for various technical indicators of the mold are also very high. In recent years, the mold level of these categories has been close to that of similar international molds, such as Xi'an rainbow, Wuxi Guosheng and Wuxi Weiyan

Guangdong ensures that sufficient lubrication measures are taken for the lubricated parts. The product drawing punched out by the progressive die of the automobile wiper chassis manufactured by Kelon Company is

(6) the progressive die of automobile parts has a strong development momentum. With the development of high efficiency and automation of automotive stamping production, progressive die production will be more widely used in automotive parts. The stamping parts with complex shape, especially some small and medium-sized complex stamping parts that need to be punched by multiple dies in different processes according to the traditional process, will increasingly adopt multi station progressive die forming. For example, the 14 position progressive die for auto window lifter parts manufactured by Tianjin Jinzhao electromechanical Development Co., Ltd. uses a 1mm thick high-strength steel plate as the stamping material, and uses a multi position progressive die to form products, replacing the original five pairs of sub process dies required for production. The production efficiency is increased by more than three times, and the die life reaches 30million strokes. 19 position progressive die for automobile frame parts, stamping material 2.6mm thick high-strength plate, forming left and right parts in one the first mock examination instead of one part in one the first mock examination. The large-scale progressive die for automotive structural parts manufactured by Guangdong Kelong Die Co., Ltd. has complex shape, large surface depth fluctuation and high precision. The level of these dies and the quality of stamping parts are equivalent to the same level abroad

overview of foreign development of precision progressive die

the level of precision progressive die technology is an important symbol to measure a country's product manufacturing level. The market of precision progressive dies is broad. Therefore, industrial developed countries continue to develop and improve in die technology and functions

(1) progressive die of motor core. Taking the large-scale the first mock examination three row iron core automatic Lamination progressive die manufactured by representative companies such as Auberger in the United States, Kuroda and Mitsui in Japan as an example, the manufacturing accuracy and step accuracy are up to 2 μ m. The service life of the die is more than 200million times, the service life of the grinding is more than 3million times, and the speed of punching is more than 300 times/min. The same period of mold manufacturing is months. According to the demand, the mold can be equipped with "electronic monitoring technology device"

(2) progressive die for air conditioner fins. Taking the large-scale the first mock examination 36 row fin progressive die manufactured by Japan Rigo, American oak and Italian GBS as an example, the manufacturing accuracy is 2 μ m. Surface roughness Ra 0.10 μ m. The service life of the mold is more than 500million times, the service life of grinding is more than 10million times, the speed of punching is more than 280 times/min, and the mold manufacturing cycle is months. Mold technology function, one mold can punch 72 rows of products

(3) progressive die of lead frame.

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