どんなプラスチックでも, 一定の収縮率があります. 適切に制御されていない場合, 射出成形部品のサイズ変更に直結します. 変化が大きすぎる場合, それは射出成形製品の不適格な品質に直接つながります. これは、多くの射出成形工場が見たくない時期です, and the three major factors affecting the dimensional change of injection molding parts.
1. Wrong selection of injection molding materials
The shrinkage of injection molding materials has little effect on the dimensional accuracy of plastic parts. If the precision of molding equipment and mold is very low, but the shrinkage rate of molding material is very small, it is very easy to ensure the dimensional accuracy of plastic parts. 一般に, the smaller the shrinkage of molding material is, the more difficult it is to ensure the dimensional accuracy of plastic parts. したがって、, in the selection of molding resin, it is necessary to fully consider the influence of shrinkage rate of raw materials on the dimensional accuracy of plastic parts. For the selected raw materials, the variation range of shrinkage rate must not be greater than the requirements of dimensional accuracy of plastic parts.
It should be noted that the difference of shrinkage rate of various resins is relatively small, and the analysis is based on the degree of crystallization of resins. 一般的に, the shrinkage of crystalline and semi crystalline resins is higher than that of non crystalline resins, so the range of shrinkage changes is small, and the shrinkage fluctuation of corresponding plastic parts after molding is also large; For the crystalline resin, the crystallinity is low, the molecular volume is reduced, and the shrinkage of the plastic part is small. The size of the resin spherulite also has an effect on the shrinkage rate. The spherulite is large, the gap of the molecular building is large, and the shrinkage ratio of the plastic part is large, so the impact strength of the plastic part is low.
2. Injection mold failure
The structural design and manufacturing accuracy of the mold indirectly affect the dimensional accuracy of the plastic part. In the molding process, if the rigidity of the mold is lacking or the molding pressure in the mold cavity is very low, the mold will deform, which will cause the plastic part forming size to be unstable.
If the fit clearance between the guide pillar and the guide sleeve block of the mould is out of tolerance due to less manufacturing accuracy or excessive wear and tear, the forming dimensional accuracy of the plastic part will also be reduced.
The first mock exam is that if the rigid filler or glass fiber reinforced material is used to form the raw material, the cavity will be slightly worn, or if the cavity is formed by one mold, the error between the cavity and the gate, the flow path and the improper balance of the feeding port will result in the filling process.
3. Injection molding equipment failure
If the plasticizing capacity of molding equipment is not enough, the feeding system is not stable, the screw speed is not stable, the stop function is abnormal, the check valve of hydraulic system is out of order, the thermocouple of temperature control system is burnt out, and the heater is open circuit, NS。, the molding size of plastic parts will not be stable. If these faults are found out, targeted measures can be taken to eliminate them, including the failure of injection mold.
射出成形の過程で, any small problem will affect the quality of injection molding products, and even directly affect the size change.
JasonMould Industrial CompanyLimitedについて
ジェイソンモールドは 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: JasonMould Industrial Company Limited
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]
