| 摘要 |
Method for forming a hole for a spraying nozzle which comprises the stages of forming a square hole in the central part of a punched-hole plate and forming a bulge by punching a part which includes the hole from the rear part of the hole plate towards the front face. The two inner walls which face each other across the width of the hole slope towards each other so that they open, maintaining a constant angle with respect to the hole plate. <IMAGE>
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