What are the main tests for the accuracy of injection mold processing

High machining accuracy means small machining error, and vice versa. First, the equipment used must be constantly updated.

Machining accuracy is measured by tolerance grade, the smaller the grade value, the higher the accuracy; the processing error is expressed by numerical value, the larger the value, the greater the error. From the perspective of the function of the part, as long as the machining error is within the tolerance range required by the part drawing, the machining accuracy can meet the requirements. The second is the level of processing technicians, and finally the attention to details of the process. If we want to undertake some high value-added injection mold Plastic Injection Molded Automotive Parts projects, we have to improve the accuracy of mold processing.The better the quality of the injection mold, the higher the accuracy. Ideal geometric parameters, for size, is the average size; for surface geometry, it is an absolute circle, cylinder, plane, cone, and straight line; for the mutual position between surfaces, it is absolutely parallel . The deviation of the actual geometric parameters of the part from the ideal geometric parameters is called the machining error.

What are the main tests for the accuracy of injection mold processing? 　　 1. The above are the three points that our njection mold manufacturer introduces to you about the accuracy of injection mold processing, and I hope to help all workers..Vertical, coaxial, symmetrical, etc.　　2. As for the requirements of technicians, the precision of injection mold processing is not only better than equipment, but also the level of users.　　3, is the core part, the actual size, shape, and position of the surface of the part after the injection mold is processed, and the degree of compliance with the ideal geometric parameters required by the drawing. This is the common sense of injection mold processing, but how to ensure the accuracy of processing, injection mold The manufacturer will give you a detailed explanation today.　　 Summary: The actual parameters obtained by any machining method will not be absolutely accurate

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The mold material must have good dimensional stability for injection molding, and it is best to select appropriate tool steel for heat treatment. Another kind of mold is a mold for mass production. Under normal circumstances, this kind of mold has a life of 100,000 to 200,000 processing of plastic products molds. Cavity. This kind of mold material is more than double the processing technology, material and processing cost after heat treatment, and the production capacity exceeds one million times. Cavity surface friction, if the material is not worn, it will wear quickly and the quality of the plastic will be lost.

The surface gloss and accuracy of injection molded plastics with good wear resistance are directly related to the wear resistance of the surface of the injection mold cavity, especially some plastics add glass fiber, inorganic fillers and pigments, and they flow with the plastic melt and flow at high speed.

The mold must be sprayed with rust inhibitor after production. Production is non-stop all day long, which requires high mold life. Reduce the possibility of rust in the cavity and core. Mainly used for small batch injection processing, usually referring to 100-2000 pieces per processing..

Therefore, the mold material must be corrosion resistant.The classification of plastic molds and what should be paid attention to when choosing plastic molds? There are two main types of plastic mold injection production. One is a conventional plastic mold. This kind of mold has a long life, basically it won't come down after being hung on the injection molding machine

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The performance requirements put forward the following requirements: 1. Hardening and other treatments are sufficient, while molds for thermosetting plastic molding must be hardened. Good quenching performance and small deformation:

Generally, the mold for thermoplastic plastic molding is quenched and tempered. First of all, the impurities in the steel The amount of materials should be as small as possible, and there should be no bubbles, and the microstructure should be uniform. The steel must have the performance of easy cutting. 4. Good wear resistance and toughness: Plastic molds have long-term thermal alternating load, and long-term friction.

Mold manufacturers are specifically The performance requirements put forward the following requirements: 1. Hardening and other treatments are sufficient, while molds for thermosetting plastic molding must be hardened. Good quenching performance and small deformation: most of the cavity part of the plastic mold must be heat treated, which requires the steel to have good hardenability and small deformation. When choosing steel, If other conditions can be met, this condition is the basis for the final selection. Excellent polishing performance: No matter what kind of plastic mold, the allowable surface roughness of the cavity is very small, almost all require mirror gloss. Good surface corrosion processability: Many molds require the surface of the molded plastic parts to be patterned with various other materials, such as leather,

When the mold is made of high-carbon and high-alloy steel, insufficient toughness will inevitably lead to cracking.The manufacturing cost of plastic molds is high, and the material cost only accounts for a small part of the mold cost. Therefore, when selecting steel, steel grades with good process performance, stable performance and long service life should be selected first. Excellent machining performance: The geometry of the cavity of the plastic mold is very complicated, and it is required to process deep holes, deep grooves and other difficult-to-machine parts. To achieve mirror gloss, the steel must have good hardness. 5. This requires the texture of the steel to be fine and uniform, otherwise it will corrode The result is not good. The surface roughness of the mold used in mass production is also an important condition

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Through the efforts of generations of mold designers and developers, following the trend of historical development, the molds of die-casting mold parts have also taken a new development direction.

The mold development direction of modern die-casting mold accessories: From the primitive society to the industrial information age, the tools are changing rapidly in people's daily life production. From pure manual to intelligent automation, there have been more and more perfect standards.

With the development of society, modern die-casting mold parts also have special requirements for molds and high speed injection molding processnew development directions. 1. Plastic mold parts processing mold forming parts are becoming larger and the high productivity of the parts requires one mold with multiple cavities, resulting in increasingly large molds. Large-tonnage large molds can reach 100 tons, and a mold has hundreds of cavities and thousands of cavities. It requires a large worktable for mold processing equipment, increased Y-axis and Z-axis travel, large load-bearing, high rigidity, and high consistency. 2. For complex cavities and multi-functional composite molds, as the shape of the part becomes more complex, the design and manufacturing level of the mold must be improved. Multiple grooves and multiple materials are formed in a mold or assembled into multiple components. Functional composite molds require a large amount of processing programming,

The mold steel material used for mold processing has high hardness, which requires mold processing equipment to have thermal stability and high reliability. 4. The combination of plastic mold parts processing technology and green product technology will be taken into consideration when enterprises purchase equipment. Radiation and media selection will be factors affecting safety and environmental protection. EDM milling technology will be developed in the field of mold processing in the future. 5. The composite application of multiple measurement technologies, high-speed measurement and reverse engineering have become the development direction that promotes mold participation in product development and design technology.　　 

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The temperature difference between the mold cavities, attention must be paid to the design of the temperature control to the cooling circuit.

The shrinkage rate of plastic refers to the percentage difference between the size of the plastic part at the molding temperature and the size after being taken out of the mold and cooled to room temperature. It reflects the degree of reduction in size of the plastic part after being taken out of the mold and Molded Automotive Parts cooled. Any plastic products have certain size requirements. Plastic products with matching requirements during use or installation have higher dimensional accuracy requirements.

The difference between the plastic shrinkage rate estimated by the design mold and the actual shrinkage rate and the fluctuation value of the shrinkage rate during the production of the product will affect the dimensional accuracy of the plastic product. Secondly, the shrinkage rate of plastic has a great relationship with the shape of the plastic part, the complexity of the internal structure, whether there are inserts, etc.

In addition, the mold cavity is constantly worn out during use, which makes the size of the products produced by the same mold different when it is new and when it is old. Variations in the installation dimensions and fitting clearances of mold forming parts will affect the tolerances of plastic parts.

For this reason, it is recommended that relevant export companies: If it is the shrinkage problem of extrusion or injection molding products, the corresponding margin should be increased from the mold; if the shrinkage of the raw material is large, glass fiber modification can be used to reduce the raw material's own The problem of large shrinkage rate; if the uneven shrinkage of the product affects the appearance, it should be considered in the thickness distribution structure of the product. In the mold design, temperature control measures must be taken to heat or cool the mold, and in order to minimize the temperature difference between the mold cavities, attention must be paid to the design of the temperature control to the cooling circuit.

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