The precision of homemade molds is imperative

The level of technology and the level of scientific and technological content of mold production have become an important indicator of a country’s level of technology and product manufacturing. It largely determines the quality, efficiency, and ability to develop new products and determines the manufacturing of a country. International competitiveness of the industry. According to the development status of the domestic and international mold market, mold expert Luo Baihui predicts that in the future, after China's mold is adjusted by the industry structure, the precision of the mold will be higher and higher. The mold is the basic process equipment for industrial production. In electronics, automobiles, motors, electrical appliances, meters, home appliances, and communications products, 80% to 90% of parts and components rely on mold forming. The shape of the mold determines the shape of these products. The quality and accuracy 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. Then what impact does the mold have on automotive manufacturing? What are the automotive industry's requirements for the mold industry?

The advantages of using molds are that they can reduce costs, save time, increase production efficiency, and enable companies to remain invincible in the current fierce competition. However, the current mold used in automotive manufacturing, or plastic components, lights, steel shell and other accessories. The real car core engine still uses cutting technology and does not use mold technology.

In addition to the engine can not use the mold technology, the crankshaft used in the car can not use this technology. What are the reasons? We all know that the components that use the mold forming technology have a certain degree of adaptability, and it itself requires a relatively thin, but also a certain degree of molding. Thickness and diameter components like crankshafts and connecting rods are more difficult to stamp with dies. At present, the most used one is to use a die to make a crankshaft blank, and then use cutting for finishing.

When the machining accuracy is very high, the molds are often not enough. Now the accuracy of precision molds can be achieved in the range of about 0.1 to 0.01 millimeters. Compared to previous molds, this accuracy has been considered a big step forward. However, such components as the engine require an accuracy of one thousandth of a millimeter or less. Therefore, it is not possible to completely replace the cutting process with a mold.

The mould now has a great leap in its 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 pass, the precision of the manufactured product will not be high. Therefore, Luo Baihui, a mold expert, believes that the adoption of advanced mold technology is an inevitable trend for adapting to fierce competition, and increasing 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 precision of molds, and it is also the voice of the automobile and other industries.

Strengthen the accuracy of the mold concept Recognition 1. Mold refers to the precision forming tool used for batch forming processing products such as stamping. Mold accuracy includes the accuracy of the parts obtained on the machining and the quality of the products to ensure the accuracy of the product. However, the accuracy of the mold usually refers to the accuracy of the mold parts.

1. The precision concept in mold machining refers to the degree of conformity between the actual geometric parameters and the design geometric parameters after the mold parts are processed and assembled.

2. The concept of precision in mold production refers to a thinking mode that employees of a company gradually form in the production practice and guides the production behavior of employees, a sense of quality, that is, the quality of product accuracy is always implemented in the behavior of employees of the company. awareness.

2. The precision of the mold includes four aspects: dimensional accuracy, shape accuracy, position accuracy, and surface accuracy. Since the mold is divided into two parts, the upper mold and the lower mold, the position accuracy between the upper mold and the lower mold is most important in the four kinds of accuracy.

3. The precision of the die is to serve the precision of the product. The high-precision products must be guaranteed by a die with higher precision. The precision of the die must generally be higher than the precision of the part 2 or more.

Improve mold accuracy method 1 . Mold processing equipment accuracy assurance 2 . Accuracy of parts for mold making 1. Mold Material Accuracy Requirements Mold Steel Processing Tolerance Control Standard Template Size Precision Plate Thickness Flatness 300X300 Within +0.005-0±0.005300X500 Within +0.01-0±0.01500X800 Within +0.01-0.01±0.015800X1200 Within +0.02- 0.02±0.022. Mold parts accuracy requirements a. The guide parts that affect the accuracy of the mold are MISUMI guide posts and guide bushes, and the ultra-fine tolerance can be controlled within 0.002mm.

b. Cutting edge punching needle adopts MISUMI standard Material: SKD-11 Hardness: 60-62HRC Cutting edge shape: DREGTH punching needle is usually used to shape the inner hole or cylinder of the product. Punching accuracy can be controlled within ±0.01mm, special requirements can be achieved about 2um, and maintain the mirror.

3. The size of mold gap is the main basis for mold design and manufacturing accuracy. To ensure the product dimensional accuracy and shape and position accuracy of mold production, and product quality (such as punching section quality and burr height), it must ensure that the mold between the mold Clearance.

4 mold structure accuracy requirements 1. The guarantee of mold frame accuracy Luo Baihui said that from the perspective of processing and assembly, the accuracy of the mold frame mainly includes the following aspects: a. The planar dimensions of the upper and lower formwork and the consistency of the guide hole position; b. Plane flatness and parallelism of the template; c. The verticality of the guide hole to the large plane; d. Verticality between adjacent sides of the template; e. Matching accuracy between guide post and guide bush.

Mold frame accuracy assurance methods are: a. After the first machining method, that is, the large plane processing of the template is completed, the upper and lower templates are clamped together, and the planar dimensions and guide holes of the two templates are processed at one time.

b. Offset one of the four pilot holes from the symmetry position to ensure the assembly orientation of the mold.

c. The processing reference (Datum) is used for calibration.

d. Use high-precision guide posts and guide bushes.

e. Improve the machining accuracy of parts.

2. Guarantee of punch precision Luo Baihui believes that, from the perspective of processing and assembly, the accuracy of punches mainly includes: a. Punch shape and dimensional accuracy; b. Verticality between adjacent sides of the punch.

3. Accuracy of the die to ensure that from the perspective of processing and assembly, the precision of the die includes: a. Die shape and dimensional accuracy; b. Verticality 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. Accuracy of the forming process When machining the formed structure, no matter whether it is using computer boring, electric spark, wire cutting or ordinary milling machine processing, coordinate machining is adopted. The guarantee of this 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 guiding principles and guiding ideology for establishing an enterprise product quality assurance and management system, the concept of mold accuracy should also be applied throughout the entire process of mold design and manufacturing. In order to ensure the precision requirements of mold assembly dimensional chain closed rings, the process involved in the manufacture of molds, outsourcing (including materials, standard parts) and the whole process of mold assembly, test mold, acceptance, packaging and transportation, impact molds The key links and key factors of accuracy must be strictly controlled and managed.