Odată cu dezvoltarea rapidă a industriei mucegaiului în ultimii ani, și extinderea continuă și progresul domeniului de aplicare a noilor tehnologii și procese, s-a produs o schimbare calitativă de la acumularea de experiență tradițională la aplicarea dezvoltării software.
Aplicația largă a CAD, cam și CAE au deschis un spațiu pentru creșterea tehnologiei de control al dimensiunii geometrice a matrițelor și produselor noastre de matriță. 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, mărimea, material, structure and other aspects, we have encountered many problems and difficulties in the production process of molds and products, Printre ei, 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. Azi, 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. În general, I start from the following aspects.
1、 Control of mold design
1. Pentru inceput, we should fully understand the technical requirements of users in many aspects, such as mold structure, material, duritate, precizie, etc., 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, flow mark, 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.
Si asa mai departe, 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, etc..
3. Here is the reason for the dimensional error of formed parts of the British Plastics Association (BPF) and the distribution of its proportion:
Tehnologia Hot Runner nu face excepție: 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. in orice caz, 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;
Prin urmare, 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, slab luciu, cooling spots and other defects of the formed parts, and make the physical properties of the plastic in the best state. clasificări, there is a debugging process, În special, 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. If the exhaust is not smooth, 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. Obișnuit, 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. Prin urmare, în general, 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. Primul, 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. În acest moment, 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.
Despre Huizhou Dj Molding Co., Ltd.
Dj Mold este un Producător de mucegai din China a matrițelor din plastic- matriță de injecție, matrițe de turnare sub presiune, turnare prin suflare din plastic, turnare prin rotație, medical turnare prin injecție a plasticului, doi împușcați turnare prin injecție a plasticului, turnare cu inserție, supraformare, turnare prin injecție a metalelor, turnare prin injecție micro, turnare prin injecție cu pulbere, turnare prin injecție ceramică, turnare prin injecție de lichid, turnare prin injecție husky, mucegai de uz casnic, mucegai de turnare, unealtă pentru matriță, matrite la comanda, mucegaiuri din china, scule de prototipare rapidă, scule de prototipare din plastic, scule de presare, matriță și scule pentru piese de telefon mobil / mobil, piese auto, aspiratoare, instrumente reîncărcabile, telefoane, copiatoare, calculatoare, difuzoare multimedia, și multe alte produse electronice și electrocasnice. Și, de asemenea, un producător de produse din plastic, producător de mucegai China- componente de plastic, rezervor de apă din plastic, bile de plastic, containere de plastic, cataramă din plastic, ancoră din plastic, cuier din plastic, lingura de plastic, racord de țevi din plastic, cadere din plastic, Veselă din plastic, pahare de plastic, sticle de plastic, tava de plastic, recipient pentru cosmetice din plastic, Cutie de plastic, recipient de plastic pentru alimente, scaune din plastic, capace din plastic, închidere capac plastic, tuburi din plastic, conducte de apă din plastic, butoane din plastic, tuburi din plastic, cutii utilitare din plastic, rafturi din plastic și așa mai departe.
a lua legatura:
Persoană: James Yuan
Companie: Huizhou Dj Molding Company Limited
Adăuga: Satul LongGang,Orașul LongXi,Județul BoLuo,Orașul HuiZhou,Provincia Guangdong, China
Tel: 86-752-6682869
E-mail: [email protected]
Site: https://www.jasonmolding.com/custom-injection-molding/
