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What are the precautions for plastic injection mould ca […]
What are the precautions for plastic injection mould cavity processing? Yuhuan Shengjiu Mould Co., Ltd. explained:
① In the CNC milling processing of cavity parts, from regular shape blanks to parts processing before finishing (mainly referring to polishing), since the cavity is generally manufactured with matching copper electrodes, the milling process is generally rough Machining toolpath is the main tool, supplemented by local surface finishing.
② With parting surface and pillow surface, when processing together, the parting surface and pillow surface are processed in place without leaving a margin. Leave a margin of 0.2 ~ 0.5mm in the cavity for sparking. The remaining margin is 0.5mm. There is a margin of 0.1mm in the cavitation position and the rubbing position of the cavity, which is used for dynamic and fixed mould matching.
③ When roughing, use a large-diameter rounded tool (tool holder). If the tool diameter is too small, the tool will easily break and spring. Fillet cutters have a large diameter, good rigidity, and durability. They are usually used for rough machining of the cavity, and they are also used when finishing.
When the rigidity of the tool is not enough, bending and vibration will occur, which can not be processed normally. It is called a spring knife.
④ In the case of using the system default parameters, the tool path range in surface machining is calculated based on the movement path of the tool center axis, that is, the actual machining area is one tool radius larger than one side of the selected tool path range limit box (boundary limit box) value. Reasonably set the limit frame parameters of the tool path range to avoid the processing range exceeding the actual processing needs.
Precautions for core processing are as follows.
The core is made of steel material like the cavity, and the material is harder. It should be processed with a tool with a handle. The problem often encountered in core processing is that the ball-end cutter is not easy to clear the sharp corner. At this time, the end mill can be used to walk the curved surface and the inclined surface can be used to clear the corner. Pay attention to the cooperation between the core and the Tibetan core frame. When processing the Tibetan core frame, pay attention to walking the empty knife several times, otherwise the Tibetan core frame will have a slope, that is, the upper side is accurate and the lower side is small, so it is difficult to match Dies, especially the deep Tibetan core frames, must pay attention to this problem. The tools of the finishing frame also need new tools, and a larger tool is used. If the core is too high, you can turn over to process the frame first, and you must protect the stop step when finishing the shape with the ball head knife. In order to facilitate mould matching, the frame size can be smaller than the core size by 0.02mm, and the tolerance and step can be slightly larger when the core is finished, the tolerance is 0.01 ~ 0.03mm, and the step is 0.2 ~ 0.05mm.
Yuhuan Shengjiu Mould Co., Ltd. is a professional China manufacturer and supplier of Syringe Mould and Oxygen Mask Mould . We have strict quality control throughout the production process of our products, making our products a safe choice for everyone. And provide customers with a complete mould configuration program to help and improve the production of disposable medical equipment. According to the requirements of the market and customers, Shengjiu has developed a new type of medical mould with a full hot runner system, and developed a variety of new scientific medical equipment for customers. Welcome to consult and order: http://www.medicalmould.net/