Small-sized axial flow fan shell production method
A manufacturing method and technology of axial flow fans, applied to machines/engines, components of pumping devices for elastic fluids, mechanical equipment, etc., can solve problems such as insufficient strength, high cost, and easy damage, and achieve integrity Good, low cost effect
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Embodiment 1
[0019] Referring to Fig. 1, a small axial flow fan casing of the present invention is made of cold-rolled steel plate with a thickness of 0.7-1.5mm, and its manufacturing method includes the following steps:
[0020] a. Blanking;
[0021] b. Using a model with a smooth cylindrical wall, the material is stretched into a cylinder 1;
[0022] c. Punching; leave the central end cover 4 and support rod 5 at the bottom of the stretched cylinder, and punch the rest;
[0023] d. Reverse lip and folded edge; carry out reverse lip 7 treatment on the upper mouth of the cylinder body; the periphery of the hole punched at the bottom of the cylinder body 1 and the upper mouth of the cylinder body are folded 6;
[0024] e. Fix the bearing seat 3 by spot welding on the end cover 4;
[0025] f. Drill installation holes 2 on the reverse lip 7 of the barrel mouth, and the installation holes 2 are evenly distributed along the upper mouth;
[0026] g. Finished product after surface coating trea...
Embodiment 2
[0029] Referring to Fig. 2, a small axial flow fan casing of the present invention is made of cold-rolled steel plates with a thickness of 0.5-0.7mm. The manufacturing method is that in step b of Example 1, the smooth cylindrical wall surface of the drawing die is changed to 4-8 concave curved surfaces with "Ω"-shaped cross-sections are evenly distributed along the axial direction of the cylindrical wall, and the material is stretched into a cylinder with this drawing die; Squeeze to make it folded and fit with other cylinder walls of the cylinder to form the reinforcing rib 8 of the cylinder; repeat Example 1 for the rest.
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