A high-performance welding processing method for powder metallurgy sprockets
A technology of powder metallurgy and processing methods, which is applied in the field of high-performance welding processing of powder metallurgy sprockets, can solve the problems of low tensile strength and fatigue strength, improve tensile strength and fatigue strength, reduce manufacturing costs, and reduce energy consumption. little effect
Active Publication Date: 2018-12-14
扬州意得机械有限公司
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Problems solved by technology
[0003] Purpose of the invention: Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a high-performance welding processing method for powder metallurgy sprocket, to solve the problems caused by intermediate frequency resistance welding technology on powder metallurgy sprocket with bumps and welding pads. The problem of low tensile strength and fatigue strength caused by the steel sheet welding process of bumps
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Embodiment 1
[0016] Such as figure 1 and figure 2 As shown, the powder metallurgy sprocket includes a sprocket 1 and a welding gasket 2 , and welding gaskets 2 are welded on corresponding two sides of the sprocket 1 . Powder metallurgy matrix raw materials for sprocket 1: copper: 1~5%, nickel: 1~5%, molybdenum: 0~0.6%, carbon: 0~0.8%, impurities: 2% max, iron: balance. Welding gasket 2 is a steel sheet (DC04).
[0017] Welding machine type: energy storage welding welding machine
[0018] The high-performance welding process of the powder metallurgy sprocket is: forming-sintering-heat treatment-energy storage welding.
[0019] Among them, forming: using a 160T forming press to press and form the sprocket 1 with an upper two lower three structure.
[0020] Sintering: Mesh belt type sintering furnace is adopted, the sintering temperature is 1100-1250℃, and the sintering speed is 100-130mm / min.
[0021] Heat treatment: box-type carburizing furnace, carburizing program: carbon type: 0.6-1...
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The invention discloses a high-performance welding processing method of a powder metallurgy chain wheel. The high-performance welding processing method comprises the steps of forming, sintering, thermal treatment and stored energy welding, wherein the welding step is a stored energy welding step carried out through adopting a stored energy welding machine; welding is carried out once; tempering is carried out twice; the welding voltage is 320 to 380 V; the tempering voltage is 350 to 450 V; delayed tempering is carried out for (70 to 130) * 10 MS; prepressing is carried out for (180 to 220) * 10 MS; pressurization is put forward by (150 to 200) * 1 MS; pressurization is carried out for (10 to 25) * 10 MS; after welding, the welded wheel is kept in the state for (8 to 20) * 10 MS; tempering is carried out twice; and the air pressure is 0.4 to 1.0 Mpa. According to the high-performance welding processing method, the powder metallurgy chain wheel has welding bumps, and sheet steel which does not have bumps on a welding gasket is adopted as a substrate, and a product meets the requirements on welding performance and appearance through a special stored energy welding technological method; and electric charge is stored in a capacitor with certain capacity, a welding torch instantaneously discharges through a welding material and a workpiece, and one-time welding and two-time tempering are adopted, so that metallurgical bonding is achieved at an instantaneous contact point part of the powder metallurgy chain wheel and the sheet steel, the strength is high, and the appearance is not burnt.
Description
technical field [0001] The invention relates to the technical field of powder metallurgy auto parts, in particular to a high-performance welding processing method for powder metallurgy sprockets. Background technique [0002] The weldability of powder metallurgy parts expands the application range of powder metallurgy and increases the possibility of producing complex parts. Most powder metallurgy sprockets can be spot welded with the steel sheet with welding bumps on the welding pad to meet the welding performance requirements. However, for some powder metallurgy sprockets with built-in bumps and welded steel sheets without bumps, the ordinary welding process cannot meet the welding performance requirements. At present, the most commonly used powder metallurgy sprocket and the steel sheet with bumps on the welding gasket are welded by medium frequency resistance, which is the most common production process to achieve weldability. The existing resistance welding technology...
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IPC IPC(8): F16H55/30
CPCB23K11/002B23K11/26B23P15/14
Inventor 徐海胡云峰邬全郭益山林伟
Owner 扬州意得机械有限公司