A method for forming curved generatrix helical blades based on multi-point mold forming
A helical blade and multi-point forming technology, which is applied in metal processing equipment and other directions, can solve the problems of forming failure, inability to restrain torsional deformation, etc., and achieve the effect of avoiding damage, saving time and money
Active Publication Date: 2019-09-06
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology
Most of the existing technologies are suitable for small-stroke and small-deformation processing. The method of pressing the mold after adjusting the shape of the mold is adopted. This method cannot restrain the torsional deformation generated during the molding process of the large-deformed workpiece, resulting in molding failure.
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[0033] The present invention will be further explained below in conjunction with the drawings and specific embodiments:
[0034] in Figure 4 In the multi-point molding device used in the present invention shown, the multi-point mold is composed of two upper and lower circular indenter arrays 1 and 3.
[0035] reference figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Image 6 To explain, the specific operation process is as follows:
[0036] (1) Determine the curved generatrix spiral blade surface shape before processing, including the inner diameter, outer diameter, pitch, and the angle θ between the starting and ending edges. The material selected here is Q345, and the dimensions are (Outer diameter×inner diameter×thickness) ring-shaped metal plate, cut off the concentric fan-shaped part of θ=0.1π to obtain a fan-shaped ring-shaped blank. Specific as figure 1 Shown.
[0037] (3) In this example, the indenter adopts a semi-circular ball indenter with a radius of R=14mm; t...
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The invention relates to a method for forming a curved generatrix helical blade based on multi-point mold forming, and belongs to the technical field of curved generatrix helical blade forming. The method is characterized in by comprising the following implementation steps that the portion corresponding to the central angle (theta=(0.1-0.2)pi) of a concentric ring is removed to form a fan-shaped ring blank, and the inner diameter and the outer diameter are respectively equal to the inner diameter and the outer diameter of the spiral blade; an upper set pressure head array and a lower set pressure head array are preinstalled, and the shape of each pressure head is semi- spherical; the curved surface shape of the curved generatrix helical blade is preset, and according to the curved surfaceshape, the strokes of all pressure heads of the upper set pressure head array and the lower set pressure head array are preset to make the envelope surface of a final position point of the vertex of each pressure head coincide with the preset curved surface of the spiral blade; the working pressure head is determined according to the fan-shaped ring blank, and circumferential positioning and central positioning are conducted on the fan-shaped ring blank; according to the preset strokes of all the working pressure heads, the upward-pressing action or the downward-pressing action of each head are started; and the processed single spiral blade is spliced to form a continuous spiral blade. The method has the advantage that various curved generatrix spiral blades are produced according to preset generatrix shapes.
Description
Technical field [0001] The invention belongs to the field of mechanical design and processing, and in particular relates to a curved generatrix spiral blade molding method based on multi-point mold molding. Background technique [0002] Spiral blades are widely used in conveyors, excavators and other mechanical equipment, especially screw conveyors are widely used in industries such as food industry, port terminals, construction material transportation, machinery manufacturing and processing, and transportation. Most of the traditional spiral blades are integrally formed by oblique rolling, or formed by welding of single blades separately. Both of these methods can only be used to manufacture straight-bus spiral blades. In the process of conveying materials by the screw conveyor, the peripheral speed of the material particles near the screw shaft is larger than that of the outer layer, and the conveying speed is very low. Therefore, the inner layer of the material is promoted to...
Claims
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IPC IPC(8): B21D31/00B21D53/78
Inventor 赵春江许镱巍李宏杰张德真张雨田贾宇坤宁圆盛
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY