Hot forming method for salient points on plane of thick workpiece
A thermoforming and workpiece technology, which is applied in the field of bump thermoforming on the plane of large and thick workpieces, can solve the problems of high manufacturing cost, low production efficiency, unfavorable welding quality, etc., and achieve low manufacturing cost, high production efficiency and reliable quality Effect
Inactive Publication Date: 2009-09-02
DONGFENG MOTOR CO LTD
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[0033] In this embodiment, the fixed sleeve of the rear axle of the Shenlong car is used as the workpiece to be processed, see figure 1 , figure 2 . The end face area of the workpiece is 1734.065mm 2 , a thickness of 20.05±0.1mm, and a cylindrical workpiece with three hemispherical convex solder joints on one end surface, the outer diameter of the part is φ47±0.2, the inner hole diameter is φ16, the height of the convex solder joints is 1.5±0.1, and the solder joints are bulbous The internal diameter is φ3.5±0.15, the diameter of the center circle of the solder joint is φ32, and it is evenly distributed at 120°. The material is No. 15 carbon steel, including three processes of billet making, hot extrusion forming and punching.
[0034] Blank making process see image 3 a. Low-cost hot-rolled long bar is selected as the billet material, and the diameter D of the bar is equal to ￠30mm. The long bar is cut into a small bar of required weight through the blanking die insta...
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Abstract
The invention relates to a hot forming method for salient points on the surface of a thick workpiece. The method is used for a cylindrical workpiece with end surface area of 1256-5024 mm<2>, thickness of 16-40 mm and with salient points on one end surface, wherein the cylindrical workpiece is made of carbon steel. The method comprises two working procedures of blank-making and hot extrusion molding and is characterized in that one end surface of the required blank is processed smooth in the blank-making working procedure; in the hot extrusion molding working procedure, the blank is heated to 1100-1200 DEG C firstly, and then the blank undergoes the preforming extrusion and the forming extrusion on a press. During the preforming extrusion, the smooth end of the blank is downward and is in contact with a lower die of a preforming die; and during the forming extrusion, the end surface of the blank, which is arranged below during the performing, is put in a lower concave die of a forming die by facing upwards, and salient points are formed on the upper end surface of the blank by using drop pits arranged in an upper punching die of the forming die and provided with forming workipiece salient points. The invention adopts the hot extrusion molding technology, enables the salient points formed on the plane of the thick workpiece with high particularity to be full and regular and also has the advantages of reliable quality, simple processing, high production efficiency, low manufacturing cost and less investment.
Description
technical field [0001] The invention relates to a method for forming bumps on the plane of a particularly large and thick workpiece, or forming other bumps and bosses of various shapes and high dimensional accuracy. Background technique [0002] A large thick workpiece with bumps is a special kind of workpiece, such as the rear axle fixing sleeve used on the Shenlong sedan (see figure 1 , figure 2 ), the part has a special structure, and its characteristic is that there are three convex solder joints on the special large and thick plane of the part. It directly affects the strength of parts after welding. On such a special large and thick plane, three convex solder joints should be cold-pressed, which cannot be realized by a 1000-ton press. At present, the domestic processing of this part generally adopts the method of cutting and cold pressing. First, the blank is turned, and then three bumps are milled on one end of the blank, and then three hemispherical bumps are pre...
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IPC IPC(8): B21C23/00
Inventor 李兴国许俊
Owner DONGFENG MOTOR CO LTD