Manufacturing method of quenching cylinder sleeve with micro-deformation of inner holes, golden and high frequency

Abstract

The invention discloses a manufacturing method of a quenching cylinder sleeve with micro-deformation of inner holes, golden yellow appearance and high frequency. The method comprises the following steps of: (1) selecting alloy gray cast iron containing chromium and copper, carrying out centrifugal casting and processing the cylinder sleeve; (2) adopting high-frequency quenching equipment to quench the cylinder sleeve; (3) spraying quenching cooling medium which is 8 to 12 percent of Houghton Q251 to the heated cylinder sleeve for quick cooling and quenching and adjusting the interval between a sensing ring and an external spraying ring to control and guarantee that the appearance is golden yellow; (4) adopting a car-type low-temperature tempering furnace for tempering with the tempering temperature controlled to be 250 to 280 DEG C and preserving the temperature for 2 hours; (5) carrying out exquisite processing to the tempered cylinder sleeve, saving cutting processing to the peripheral end surfaces and water retaining parts after high frequency quenching, preserving golden yellow appearance and warehousing after being inspected to be qualified. The invention has advanced technique and simple method and by compared with the common high frequency quenching cylinder sleeve, the appearance is beautiful, the hardness and deep uniformity of the quenching layer are good, the wear resistance is good and the service life is long.

Description

technical field [0001] The invention relates to a manufacturing process of a cylinder liner, in particular to a production method of a golden-yellow high-frequency quenching cylinder liner with a micro-deformed inner hole and a golden-yellow appearance. Background technique [0002] With the research and development of high-power and high-efficiency engines, the requirements for the cylinder liner, which is one of the heart parts of the engine, are also getting higher and higher. There are two main development directions: ①alloying to improve the mechanical properties of the base material; ②surface strengthening treatment. Such as inner hole high-frequency quenching, surface infiltration layer treatment, etc. The high-frequency quenching process has the advantages of simple process, small workpiece deformation, high production efficiency, energy saving and material saving, less environmental pollution, and the process is easy to realize mechanization and automation. Theref...

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Problems solved by technology

Most of the cylinder liners used in high-power engines in Europe and the United States adopt the high-frequency quenching technology for the inner hole, but the use of induction waste heat produces a uniform golden oxide layer with good corrosion resistance on the outer circle of the cylinder liner. There is no relevant report on the method that can meet the precision requirements

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