近年の金型産業の急速な発展に伴い, 新しいテクノロジーとプロセスの適用範囲の継続的な拡大と進歩, 従来の経験の蓄積からソフトウェア開発の応用への質的な変化がありました.
CADの幅広いアプリケーション, camとCAEは、金型と金型製品の幾何学的寸法制御技術の台頭のためのスペースを開きました. 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, 金型には適度な収縮率が必要です, 素材, structure and other aspects, we have encountered many problems and difficulties in the production process of molds and products, その中で, 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. 今日, 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. 一般的に, I start from the following aspects.
1、 Control of mold design
1. 初めに, we should fully understand the technical requirements of users in many aspects, such as mold structure, 素材, 硬度, 精度, NS。, 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.
等々, 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, NS.
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. しかしながら, 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;
したがって、, 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, 光沢が悪い, cooling spots and other defects of the formed parts, and make the physical properties of the plastic in the best state. 射出成形プロセスを最適化するための5つの手法, there is a debugging process, 特に, 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. 排気がスムーズでない場合, 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. いつもの, 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. したがって、, 一般的, 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. 最初, 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. 現時点では, 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.
恵州Djモールディング株式会社について。, 株式会社
Djモールドは 中国の金型メーカー プラスチック金型の- 射出成形金型, ダイカスト金型, プラスチックブロー成形, 回転成形, 医療 プラスチック射出成形, ツーショット プラスチック射出成形, インサート成形, オーバーモールド, 金属射出成形, マイクロ射出成形, 粉末射出成形, セラミック射出成形, 液体射出成形, ハスキーインジェクションモールディング, 家庭用カビ, 鋳造金型, ダイモールドツール, カスタムモールド, 中国のカビ, ラピッドプロトタイピングツール, プラスチックプロトタイピングツーリング, パンチプレス工具, 携帯電話/携帯電話部品用の金型と工具, 自動車部品, 掃除機, 充電式ツール, 電話, コピー機, コンピューター, マルチメディアスピーカー, および他の多くの電子製品および家電製品. また、プラスチック製品メーカー, 金型メーカー中国- プラスチックの部品, プラスチック製の水タンク, プラスチックボール, プラスチック容器, プラスチックバックル, プラスチックアンカー, プラスチックハンガー, プラスチックスプーン, プラスチックパイプフィッティング, プラスチックタンブル, プラスチック製食器, プラスチックのコップ, ペットボトル, プラスチックトレイ, プラスチック化粧品容器, プラスチックケース, プラスチック製の食品容器, プラスチック製の椅子, プラスチックキャップ, プラスチックキャップクロージャー, プラスチックチューブ, プラスチック製の水道管, プラスチック製のノブ, プラスチックチューブ, プラスチック製ユーティリティボックス, プラスチックラックなど.
連絡先:
人: ジェームズ・ユアン
会社: 恵州Djモールディングカンパニーリミテッド
追加: 竜崗村,Long西町,博羅県,恵州市,広東省, 中国
電話: 86-752-6682869
Eメール: [email protected]
