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High-frequency induction heating equipment for quenching needle felts
Release time:
2023-12-22
A carding needle plate is a component used to comb fibers; its surface is shaped like needles or teeth and is primarily mounted on the surface of the roller and the flat surface of the cover plate in a carding machine.
A needle cloth is a component used for fiber梳理, with its surface featuring needles or teeth. It is primarily mounted on the surface of the roller and the flat surface of the cover plate in carding machines. During operation, the needle tips of the needle cloth must be sharp, smooth, and wear-resistant, and the geometric shape of the needle tip surfaces must be perfectly perpendicular to the plane. Due to differences in their structural designs, needle cloths are categorized into elastic needle cloths and metal needle cloths. However, metal needle cloths offer higher speeds, greater production capacity, stronger adaptability, and longer needle-replacement cycles than elastic needle cloths; thus, they are relatively more widely used. Based on the technical characteristics and performance requirements of needle cloths, high-quality medium-carbon steel is typically employed in their manufacture. After rough machining, the needle cloths undergo quenching treatment using high-frequency induction heating equipment, which imparts them with high hardness, excellent wear resistance, good toughness, and enhanced sharpness and smoothness.
When processing needle cloth, the first step is annealing, followed by forging and shaping. Next, the material undergoes quenching and tempering heat treatment, after which it is inspected and deemed qualified if it meets the required standards. Since the needle tips of needle cloth are both thin and long, using high-frequency induction heating equipment for quenching is highly appropriate. Before quenching, this approach not only ensures that the needle cloth will not exhibit uneven surface hardness during quenching but also relieves residual stresses induced by the blanking process, thereby guaranteeing that the needle cloth achieves excellent mechanical properties, with high strength and toughness. However, one point to note is that if the needle cloth shows uneven hardness after annealing prior to forging, even re-quenching after shaping will still result in an uneven surface. In such cases, the needle cloth would be considered non-conforming.
When performing heat treatment, first adjust the proper distance between the inductor, rotational speed, and needle cloth, and strictly adhere to the standard requirements for heating temperature and duration. Promptly inspect the hardness of the raw materials to ensure consistent overall hardness, thereby preventing uneven hardness and surface irregularities in the needle cloth after quenching.
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