The technological level of mold production and the level of scientific and technological content have become an important indicator for measuring the level of technology and product manufacturing in a country. It determines the quality, efficiency and development ability of new products to a large extent, and determines the manufacturing of a country. The international competitiveness of the industry. According to the development of the domestic and international mold market, mold expert Luo Baihui predicts that the precision of the mold will be higher and higher in the future after the mold adjustment of China's molds. Mold is the basic process equipment for industrial production. In electronics, automobiles, motors, electrical appliances, instruments, home appliances and communications products, 80% to 90% of the parts are formed by molds. The shape of the molds determines the shape of these products. The quality and precision of the molds determine the quality of these products.
With the increasing economic and living standards, the number of cars has also risen. When we saw so many cars, we couldn’t help but realize the huge output behind the manufacturers. Undoubtedly, China's mold industry has driven the development of the automotive industry. What effect does the mold have on automobile manufacturing? What requirements does the automobile manufacturing industry have for the mold industry?
The advantage of using molds is that it can reduce costs, save time, increase production efficiency, and enable enterprises to be invincible in today's highly competitive market. However, the current molds used in automobile manufacturing are also accessories such as plastic components, lamp lights, and steel plate casings. The real automotive core engine still uses cutting technology and does not use mold technology.
In addition to the inability of the engine to use mold technology, the crankshaft used in automobiles cannot be used in this technology. What is the reason? We all know that components using mold forming technology have certain adaptability. It requires relatively thin materials and must have certain molding. It is difficult to use a die with a thickness and a diameter such as a crankshaft or a connecting rod. The most can be used now is to use the mold to make the crankshaft of the crankshaft, and then use the cutting for finishing.
When the processing precision is very high, the mold is often more than enough. The accuracy of a very good mold is now in the range of about 0.1 to 0.01 mm, which is a big step forward compared to previous molds. However, components such as engines require accuracy below a thousandth of a millimeter or even less. Therefore, it is not possible to completely replace the cutting process with a mold.
The mold now has a great leap in its own finish and roughness. However, the mold itself is also manufactured by the machine tool. If the precision of the machine tool for manufacturing the mold itself cannot be checked, the precision of the manufactured product is inevitably low. Therefore, mold expert Luo Baihui believes that the use of advanced mold technology is the inevitable trend of adapting to fierce competition, and improving the competitiveness of the mold itself to meet the needs of the market is even more important. It is the requirement of the development of the mold industry to improve the high precision of the mold, and it is also the voice of the automobile and other industries.
Strengthening the concept of mold precision
1. Mold refers to a precision forming tool used as a product for batch forming and stamping. Mold accuracy includes the accuracy of the parts obtained on the machine and the quality awareness of ensuring the accuracy of the product during production. However, the accuracy of the mold usually refers to the precision of the parts of the mold.
1. The accuracy concept in mold processing refers to the degree of conformity between the actual geometric parameters and the design geometric parameters after machining and assembly of the mold parts.
2. The concept of precision in mold production refers to a thinking mode that employees gradually form in production practice and guides employees' production behavior. A quality consciousness, that is, in the behavior of enterprise employees, always implements the quality awareness of product precision.
2. The accuracy of the mold includes four aspects: dimensional accuracy, shape accuracy, positional accuracy, and surface accuracy. Since the mold is divided into two parts, the upper mold and the lower mold, the positional accuracy between the upper and lower molds is the most important among the four kinds of precision.
3. The precision of the mold is to serve the precision of the product. The high-precision product must be guaranteed by a more high-precision mold. The precision of the mold must be higher than the accuracy of the workpiece by level 2 or above.
Method of improving mold accuracy
1. Precision of mold processing equipment
2. Mold manufacturing parts accuracy requirements
1. Mold material accuracy requirements
Mold steel processing tolerance control standard template size fine plate thickness flatness 300X300 +0.005-0±0.005300X500 +0.01-0±0.01500X800+0.01-0.01±0.015800X1200+0.02-0.02±0.022 . The accuracy of the mold parts requires a. The guide parts that affect the accuracy of the mold adopt the MISUMI guide column and the guide sleeve series, and the ultra-fine tolerance can be controlled within 0.002mm.
b. The cutting edge forming punching needle adopts the MISUMI standard material: SKD-11 hardness: 60-62HRC cutting edge shape: DREGTH punching needle is usually used for forming the inner hole or cylindrical shape on the product. The precision of the punching needle can be controlled to ±0.01mm, and the special requirement can be about 2um, and the mirroring is maintained.
3. The size of the mold gap is the main basis for mold design and manufacturing accuracy. To ensure the dimensional accuracy and shape position accuracy of the mold production, as well as the product quality (such as the cross-section quality and burr height), the gap between the mold embossing molds must be ensured. .
4. The structural accuracy of the mold requires 1. Guarantee of mold frame accuracy Luo Baihui said that from the perspective of processing and assembly, the accuracy of the formwork mainly includes the following aspects: a. The planar dimensions of the upper and lower templates and the position of the guide holes; b. The flatness and parallelism of the large plane of the template; c. The verticality of the guide hole to the large plane; d. The perpendicularity between adjacent sides of the template; e. The precision of the matching between the guide post and the guide sleeve.
The main methods for guaranteeing the accuracy of the formwork are:
a. After the one-time machining method, that is, the large-plane machining of the template is completed, the upper and lower templates are clamped together, and the planar dimensions and the guide holes of the two templates are processed at one time.
b. One of the four pilot holes is offset from the symmetry to ensure the orientation of the mold.
c. Processing reference position (Datum) for calibration processing.
d. The guide post and guide bush with high matching precision are adopted.
e. Improve the machining accuracy of parts.
2. Guarantee of punch accuracy Luo Baihui believes that from the perspective of processing and assembly, the accuracy of punches mainly includes: a. The shape and dimensional accuracy of the punch; b. The perpendicularity between adjacent sides of the punch.
3. The accuracy of the die ensures that the accuracy of the die mainly includes: a from the perspective of processing and assembly. The dimensional accuracy of the die; b. The perpendicularity between adjacent sides of the die; c. The perpendicularity of the side of the die to the large plane; d. The position of the die.
5. The precision of the forming process ensures that when machining the formed structure, whether it is computer boring, electric spark, wire cutting or ordinary milling machine processing, the coordinate processing method is adopted. The guarantee of accuracy depends mainly on the accuracy of the machine tool and the accuracy of the operator's calibration and classification. Luo Baihui believes that, like the guidelines and guiding ideology for establishing enterprise product quality assurance and management system, the concept of mold precision should also run through the whole process of mold design and manufacturing. In order to ensure the precision requirements of the mold assembly size chain closed loop, the process involving the processing and manufacturing of the mold, outsourcing (including materials, standard parts) and the whole process of mold assembly, trial mold, acceptance, packaging and transportation, affecting the mold The key aspects and key factors of precision must be strictly controlled and managed.
Concerned about surprises
Label: Guide hole Lower template Surface accuracy Position degree Cutting edge shape
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