Micro-hole bidirectional-extrusion forming process
A technology of bidirectional extrusion and forming process, applied in the field of mechanical processing, can solve the problems of affecting the accuracy of parts, enlarge the aperture, and be unsuitable for manufacturing microscopic holes, and achieve the effect of high production efficiency and cost saving.
Inactive Publication Date: 2016-03-02
NINGBO UNIVERSITY OF TECHNOLOGY
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Problems solved by technology
However, this method is to prefabricate small holes first, and then squeeze the holes by interference, which actually makes the hole diameter further enlarged, which is not suitable for making microscopic holes.
In addition, this method is only suitable for blind holes. If it is a through hole, the excess metal may be squeezed to the other end of the hole during interference extrusion, affecting the accuracy of the part
Method used
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Embodiment
[0022] The first step is blanking, using 45# steel annealed sheet metal, wherein the thickness of the sheet metal is 4mm.
[0023] In the second step, the reverse extrusion process, the 45# steel annealed sheet material is placed on the punch press, a reverse extrusion upper punch 1 is installed on the punch of the punch press, and a reverse extrusion lower punch is installed on the punch die 3. The diameters of punch 4, upper punch 1 for back extrusion and lower punch 4 for back extrusion are 4 to 6 times (2 mm) of the required pore diameter, and upper punch 1 for back extrusion and lower punch 4 for back extrusion The axis of the punch 4 coincides with the axis to be punched, the upper part of the punch to be punched is fixed with the back-extrusion blankholder 2, the punch drives the back-extrusion upper punch 1 to press down, and the punch die 3 is set floatingly, As the 45# steel annealed sheet material moves downward together, the lower punch 4 of the reverse extrusion i...
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The invention relates to a technology in the field of machining, in particular to a micro-hole bidirectional-extrusion forming process which is implemented by the following steps: 1, a backward extrusion procedure, including that male dies are placed up and down simultaneously for extrusion, the axes of the make dies coincide with those of to-be-punched holes, the diameters of the males dies are 4-6 times those of the to-be-punched holes, the outer sides of the to-be-punched holes are fixed by a blank holder, a female die is arranged in a floating way and moves downwards with a piece of sheet metal, the upper male die presses down, and the lower male die is fixed; 2. a punching procedure, including that the blind holes formed in the sheet metal in the backward extrusion procedure are punched to form a through hole; 3, the surface friction of the sheet metal is increased to achieve the surface roughness above 6.4; 4, a heading procedure, including that a ring-shaped boss formed in the backward extrusion procedure is headed, another female die is arranged in a floating way and moves downwards with the sheet metal, and the ring-shaped boss formed in the last procedure is headed by an upper heading make die to obtain a required micro-hole.
Description
technical field [0001] The invention relates to a technology in the field of mechanical processing, in particular to a micropore bidirectional extrusion forming process. Background technique [0002] With the development of science and technology and industrial production, the application of tiny holes is becoming more and more extensive, and more and more parts with tiny holes appear, such as fuel injectors, aerostatic bearings, spinnerets, printer nozzles, etc. Quasi-holes generally have the characteristics of small diameter, large depth-diameter ratio and difficult machining, so micro-deep hole processing technology has become the key technology for the manufacture of such products. At present, there are six methods that can be applied to micro-hole processing, including ultrasonic processing, drilling processing, grinding processing, laser processing, electrical discharge processing and electron beam processing. Considering the properties of the material to be cut (hardn...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B21C23/18B21J5/08
CPCB21C23/18B21J5/08
Inventor 王可胜陈勇章李尚荣
Owner NINGBO UNIVERSITY OF TECHNOLOGY