최근 몇 년 동안 금형 산업의 급속한 발전으로, 새로운 기술 및 프로세스의 적용 범위의 지속적인 확장 및 진행, 전통적인 경험의 축적에서 소프트웨어 개발의 응용으로 질적 변화가 있었습니다..
CAD의 폭넓은 응용, cam과 CAE는 금형 및 금형 제품의 기하학적 치수 제어 기술의 부상을 위한 공간을 열었습니다.. 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, 크기, 재료, structure and other aspects, we have encountered many problems and difficulties in the production process of molds and products, 그 중, 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. 오늘, 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. 일반적으로, I start from the following aspects.
1、 Control of mold design
1. 가장 먼저, we should fully understand the technical requirements of users in many aspects, such as mold structure, 재료, 경도, 정도, 등., 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.
등등, 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, 기타.
3. Here is the reason for the dimensional error of formed parts of the British Plastics Association (BPF) and the distribution of its proportion:
NS: 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. 하나, 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;
따라서, 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, 외부 표면에 명백한 용접 표시가 없습니다., cooling spots and other defects of the formed parts, and make the physical properties of the plastic in the best state. 물론이야, there is a debugging process, 특히, 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. 배기가 원활하지 않은 경우, 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. 대개, 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. 따라서, 일반적으로, 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. 먼저, 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. 이때, 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.
사출 금형의 구조에서주의해야 할 세 가지 점은 전체 금형 배아와 금형 코어의 조정입니다., 주식회사
디제이 몰드는 중국 금형 제작자 플라스틱 금형- 사출 금형, 다이 캐스팅 금형, 플라스틱 블로우 성형, 회전 성형, 의료 플라스틱 사출 성형, 투샷 플라스틱 사출 성형, 인서트 몰딩, 오버 몰딩, 금속 사출 성형, 마이크로 사출 성형, 분말 사출 성형, 세라믹 사출 성형, 액체 사출 성형, 허스키 사출 성형, 가정용 곰팡이, 주조 금형, 금형 도구 다이, 맞춤 금형, 중국 금형, 신속한 프로토 타이핑 도구, 플라스틱 프로토 타이핑 툴링, 펀치 프레스 툴링, 모바일 / 휴대폰 부품 용 다이 및 툴링, 자동차 부품, 진공 청소기, 충전식 도구, 전화기, 복사기, 컴퓨터, 멀티미디어 스피커, 및 기타 많은 전자 제품 및 가전 제품. 또한 플라스틱 제품 제조업체, 금형 제조업체 중국– 플라스틱 부품, 플라스틱 물 탱크, 플라스틱 공, 플라스틱 용기, 플라스틱 버클, 플라스틱 앵커, 플라스틱 걸이, 플라스틱 숟가락, 플라스틱 파이프 피팅, 플라스틱 텀블, 플라스틱 식기, 플라스틱 컵들, 플라스틱 병, 플라스틱 쟁반, 플라스틱 화장품 용기, 플라스틱 케이스, 플라스틱 식품 용기, 플라스틱 의자, 플라스틱 캡, 플라스틱 캡 폐쇄, 플라스틱 튜브, 플라스틱 수도관, 플라스틱 손잡이, 플라스틱 튜브, 플라스틱 유틸리티 박스, 플라스틱 선반 등.
접촉:
사람: 제임스 위안
회사: 사출 금형의 구조에서주의해야 할 세 가지 점은 전체 금형 배아와 금형 코어의 조정입니다.
더하다: 롱강 빌리지,LongXi 타운,BoLuo 카운티,혜주시,광동성, 중국
Tel: 86-752-6682869
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