Благодаря быстрому развитию индустрии пресс-форм в последние годы, и постоянное расширение и прогресс области применения новых технологий и процессов, произошел качественный переход от накопления традиционного опыта к применению разработки программного обеспечения.
Широкое применение САПР, cam и CAE открыли пространство для развития технологии контроля геометрических размеров наших пресс-форм и изделий из них.. Due to the great difference in the market demand of molds and mold products, there are many kinds, and the great changes and high requirements in the shape, размер, материал, structure and other aspects, we have encountered many problems and difficulties in the production process of molds and products, Среди них, how to effectively control the geometric dimensions of the mold and products is very intuitive in front of us.
There are different control technologies and methods for different types of molds and products. Сегодня, I am here to talk about some experience on the dimensional control of injection molding products. When talking about injection molding products, I must also talk about injection molds. Обычно, I start from the following aspects.
1、 Control of mold design
1. Прежде всего, we should fully understand the technical requirements of users in many aspects, such as mold structure, материал, твердость, точность, и т.п., including whether the shrinkage of formed plastic material is correct, whether the 3D dimension modeling of the product is complete, and conduct reasonable processing and analysis.
2. Full consideration shall be given to the shrinkage cavity, метка потока, mold pulling inclination, weld line, crack and other places that have an impact on the appearance of injection molded products.
3. The processing method of the mold shall be simplified as much as possible without hindering the product function and pattern shaping of the injection molded parts.
Graph source network
4. Whether the selection of parting surface is appropriate, careful selection shall be made for die processing, forming appearance and deburring of formed parts.
5. Whether the pushing method is appropriate, whether the push rod, discharge plate, pushing sleeve and other methods are used, and whether the positions of the push rod and discharge plate are appropriate.
6. Whether the use of side core pulling mechanism is appropriate, the action is flexible and reliable, and there should be no stagnation.
7. Which method of temperature control is more suitable for plastic products, which structure circulation system is used for temperature control oil, temperature control water and coolant, and whether the size, quantity and position of coolant holes are appropriate.
8. Whether the gate form, the size of the material channel and the feed gate, the gate position and size are appropriate.
9. Whether the influence of heat treatment deformation of various modules and mold cores and the selection of standard parts are appropriate.
10. Whether the injection volume, injection pressure and clamping force of the injection molding machine are sufficient, and whether the nozzle R and the sprue sleeve aperture match properly.
И так далее, which should be strictly controlled from the initial stage of product parts.
2、 Process manufacturing control
Although it has been fully considered and arranged in the design stage, many problems and difficulties will occur in the actual production. We should try our best to conform to the original intention of the design in the production and find out more effective, more economical and reasonable process means in the actual processing.
1. Select economical and suitable machine tools and equipment for 2D and 3D processing schemes.
2. A series of production process requirements and solutions can also be considered, such as appropriate tooling and fixtures for auxiliary preparation during production, rational use of cutting tools, prevention of deformation of product parts, fluctuation of shrinkage rate of product parts, prevention of demoulding deformation of product parts, improvement of mold manufacturing accuracy, reduction of errors, prevention of changes in mold accuracy, так далее.
3. Here is the reason for the dimensional error of formed parts of the British Plastics Association (BPF) and the distribution of its proportion:
А: Die manufacturing error is about 1/3, B error caused by die wear is about 1/6, C error caused by uneven shrinkage of formed parts is about 1/3, D error caused by inconsistency between predetermined shrinkage and actual shrinkage is about 1/6
Total error =a+b+c+d, so it can be seen that the manufacturing tolerance of the die should be less than 1/3 of the dimensional tolerance of the formed part, otherwise the die is difficult to ensure the geometric dimension of the formed part.
3、 General production control
The geometric dimension fluctuation of plastic parts after forming is a common problem and often occurs:
1. The control of material temperature and mold temperature requires different temperature requirements for plastics of different brands. The poor fluidity of plastic materials and the use of more than two kinds of mixtures may occur. It is usually easy to control the plastic materials within the range of the best flow value. Однако, the control of mold temperature is more complex. Different shapes, sizes and wall thickness ratios of formed parts have certain requirements for the cooling system, The mold temperature controls the cooling time to a great extent;
Следовательно, try to keep the mold at an allowable low temperature, so as to shorten the injection cycle and improve the production efficiency. If the mold temperature changes, the shrinkage rate will also change. If the mold temperature remains stable, the dimensional accuracy will be stable, so as to prevent the deformation, плохой блеск, cooling spots and other defects of the formed parts, and make the physical properties of the plastic in the best state. Шэньчжэнь двухцветная фабрика по производству пресс-форм, которая хороша, there is a debugging process, Особенно, multi cavity die forming parts are more complex.
2. Pressure and exhaust adjustment control:
The proper injection pressure and the matching of the clamping force should be determined when debugging the mold. The air in the gap formed by the mold cavity and core and the gas generated by the plastic must be discharged from the exhaust slot out of the mold. Если выхлоп не гладкий, insufficient filling will occur, resulting in weld marks or burns. These three kinds of forming defects sometimes occur at the same part occasionally;
When there is a thick wall around the thin-walled part of a shaped part, insufficient filling will occur when the mold temperature is too low, and burns will occur when the mold temperature is too high. Как правило, weld marks will appear at the burned part at the same time, and the exhaust slots are often ignored and generally in a small state. Следовательно, в целом, as long as there is no burr, the depth of the exhaust shoulder should be as deep as possible, and a large vent slot should be set at the back of the shoulder, So that the gas passing through the shoulder can be quickly discharged out of the mold. If there is a special need to open an exhaust slot on the ejector rod, the principle is the same. Первый, there is no flash, and second, the gas can be discharged quickly to achieve good results.
3. Supplementary shaping control of injection molded parts
Due to different shapes and sizes of some plastic parts, different deformation and warpage will occur with the change of temperature and pressure loss after demoulding. На данный момент, some auxiliary tooling fixtures can be used for adjustment. Remedial measures can be taken promptly after the formed parts are out of the mold. Good correction and adjustment effects can be achieved after they are naturally cooled and shaped. If strict management is ensured in the whole injection molding process, the size of injection molded parts will be well controlled.
отрегулируйте скорость открытия пресс-формы и давление во время процесса впрыска, чтобы избежать сбоя, вызванного сильным волочением, ООО
Dj Mold - это Производитель пресс-форм в Китае пластиковых форм- пресс-форма для литья под давлением, формы для литья под давлением, выдувное формование пластика, ротационное формование, медицинский литье пластмасс под давлением, два выстрела литье пластмасс под давлением, вставка молдинга, формование, литье металла под давлением, микро литье под давлением, порошковое литье под давлением, керамическое литье под давлением, жидкое литье под давлением, хаски литье под давлением, бытовая плесень, литейная форма, инструмент для штамповки, нестандартные формы, фарфоровые формы, инструменты для быстрого прототипирования, инструменты для изготовления пластиковых прототипов, инструмент для штамповки, штамп и инструменты для деталей мобильных / сотовых телефонов, автомобильные запчасти, пылесосы, аккумуляторные инструменты, телефоны, копировальные аппараты, компьютеры, мультимедийные колонки, и многие другие электронные товары и бытовая техника. А также производитель пластиковых изделий, производитель пресс-форм Китай- пластиковые детали, пластиковый резервуар для воды, пластиковые шары, пластиковые контейнеры, пластиковая пряжка, пластиковый якорь, пластиковая вешалка, пластиковая ложка, пластиковые фитинги, пластиковая мешалка, пластиковая посуда, пластиковые стаканы, пластиковые бутылки, пластиковый поднос, пластиковый косметический контейнер, пластиковый корпус, пластиковый контейнер для еды, пластиковые стулья, пластиковые колпачки, пластиковая крышка, пластиковые трубки, пластиковые водопроводные трубы, пластиковые ручки, пластиковые трубки, пластиковые хозяйственные ящики, пластиковые стойки и тд.
Контакт:
Человек: Джеймс Юань
Компания: Huizhou Dj Molding Company Limited
Добавлять: Деревня ЛонгГанг,LongXi Town,Округ БоЛуо,Город Хуэйчжоу,Провинция Гуандонг, Китай
Тел.: 86-752-6682869
Электронное письмо: [email protected]
Сайт: https://www.jasonmolding.com/custom-injection-molding/
