REDUING BUSH
Specialize in manufacturing all moulds of pipe fitting series: pvc drainage pipe fitting mould, ppr cold and hot water pipe fitting mould, PE pipe fitting mould...
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Plasticpipe fittings moulds
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REDUING BUSH
Detail
Core purpose:
Repair defects/wear: During the use of the mold, critical parts (especially areas with high stress and frequent friction) may experience wear, resulting in the formed pipe fittings exceeding the dimensional tolerance (usually becoming smaller or having an inaccurate shape). Repairing the core can restore this part of the size.
Correcting processing errors: During the mold manufacturing process, if a certain part is excessively processed and the size is reduced, it can be corrected by "adding material" through core filling.
Repair damage: The mold may be damaged by bumps, cracks, etc. during handling, installation, debugging, or use. Core repair can repair these damaged areas.
Local reinforcement: Sometimes, in order to enhance the wear resistance or strength of a specific area of the mold, materials with better performance are added to that area.
Design changes: If there are minor changes in product design (such as local thickening or shape changes), the mold cavity may be modified through core patching instead of redoing the entire mold.
Common methods:
Welding repair:
Principle: At the parts of the mold that need to be repaired or enlarged, metal materials are stacked by welding (such as argon arc welding, laser welding, cold welding, etc.), and then reprocessed to the required size and smoothness.
Key points:
Material matching: The welding material must have good compatibility with the mold substrate material (chemical composition, thermal expansion coefficient, heat treatment performance, etc.), and usually the same or similar grades of dedicated mold welding wire/electrode are selected. Common mold steels such as H13, P20, S7, etc. have corresponding welding materials.
Preheating and post heating: The vast majority of mold steel welding requires strict preheating (to prevent cold cracking) and control of interlayer temperature. After welding, slow cooling or specific post heat treatment (such as stress relief annealing) may be necessary to prevent welding deformation, cracking, and ensure uniform hardness.
Process control: Using low current, multi-layer and multi pass welding to reduce heat input and deformation. Thoroughly remove welding slag and spatter after welding.
Advantages: High flexibility, suitable for repairing complex shapes and different positions.
Disadvantages: The heat affected zone may alter the performance of the mold, pose a risk of deformation, and require high welding skills.
Embedding method:
Principle: Cut off the undersized or damaged part of the mold as a whole, and then process a precisely sized and material matched (or better) insert (i.e. "core repair"). Insert it into the cut position through interference fit, screw fastening, hot insert (press in cold insert after heating the mold) or cold insert (press in mold after cooling the insert), and finally precision process the formed surface.
Key points:
Design and processing of inserts: The dimensions of inserts need to be accurately calculated, taking into account the fitting method and machining allowance. The material is usually consistent with the master mold, or higher performance materials (such as hard alloys) are selected for wear prone areas.
Coordination accuracy: The interference fit or gap must be strictly controlled to ensure that the inlay is firm and reliable, without looseness, and the formed surface joints have a smooth transition.
Fixed method: In addition to interference fit, screws, pins, or step positioning are often used to strengthen the fixation.
Advantages: No heat affected zone issues, free selection of insert materials (which can be more wear-resistant), high repair strength, good reliability, especially suitable for large-area repair or design of vulnerable parts.
Disadvantages: It requires extremely high processing accuracy, relatively complex processes, and may require specialized equipment (such as wire cutting processing chambers), which may be more expensive than welding (small-scale).
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103, Building 10, Lecheng Molding Industrial Park, Xinqian Street, Huangyan District, Taizhou city, Zhejiang Province