Detailed Analysis of Structural Material Maintenance of Injection Pipe Mold

• 2026-01-23

The

injection mold is the core tool for the production of various types of plastic pipe fittings (such as water pipe joints, valve fittings, drainage pipe fittings, etc.), and its design and maintenance directly affect the dimensional accuracy, surface quality and production efficiency of the pipe fittings. The following from the structure, materials, maintenance points for your detailed analysis:

1. die structure

molding part: It is composed of cavity and core, which directly determines the shape and size of the pipe. The cavity corresponds to the external contour of the pipe fitting, and the core corresponds to the internal structure. The coordination between the two needs to be precise to ensure the uniform wall thickness of the pipe fitting.

gating system: including the main runner, runner and gate, responsible for guiding the molten plastic to the cavity. Reasonable gating system design can reduce the pressure loss, avoid the plastic in the flow process of cold insulation, under injection and other issues.

cooling system: The water channel set around the cavity and the core quickly takes away the heat of the plastic through the circulating cooling water, so that the pipe fittings are evenly cooled and shaped. The layout of the cooling system affects the cooling rate and the degree of deformation of the pipe.

ejection system: It is composed of ejector rod, top plate, etc., and it is ejected from the mold after the pipe is cooled. The design of the ejection system should ensure uniform ejection force to prevent deformation or damage of the pipe fittings during the ejection process.

2. mold material

die steel: commonly used H13, S136 and other steels, with good strength, wear resistance, heat resistance and corrosion resistance, can meet the requirements of high temperature and high pressure in the injection molding process.

surface treatment: In order to improve the surface hardness and wear resistance of the mold, chromium plating, nitriding and other surface treatments are often carried out. The chromium plating layer can effectively prevent the surface of the mold from being corroded by additives in the plastic, and at the same time improve the mold release performance.

3. daily maintenance points

cleaning: After each production, clean up the oil, residue and impurities on the surface of the mold, especially the cavity, core and gating system, to prevent the residue from affecting the accuracy of the mold and the quality of the pipe fittings.

Lubrication: Regularly add lubricant to the moving parts of the mold, such as guide posts, guide sleeves, ejector pins, etc., to reduce wear and ensure smooth opening and closing of the mold. Pay attention to the moderate amount of lubricant to avoid contamination of the mold cavity.

Inspection and fastening: Regularly check whether the bolts, nuts and other fasteners on the mold are loose, and tighten the loose parts in time to prevent the mold from shifting during the production process. At the same time, check the wear of positioning parts such as positioning pins and positioning holes, and replace or repair them if necessary.

Appearance inspection: check the appearance of the mold for cracks, deformation, etc. before starting the machine every day, and repair minor damages in time. Focus on checking the degree of wear of the ejector rod, slider and other easily worn parts, and decide whether to replace them according to the situation.

Cooling system maintenance: Clean the cooling water channel regularly to prevent scale and impurities from clogging and ensure the cooling effect. Check whether the connection of the water pipe is tight to avoid water leakage affecting the production environment.

Do a good job in the daily maintenance of injection mold, can effectively extend the service life of the mold, improve the quality and efficiency of pipe production, reduce production costs.