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sakthivel@ippengineers.in
Call Us Now : +91 - 9787738596 | sakthivel@ippengineers.in
Similar to conventional machines such as boring, milling machines, which aremanufactures most precisely and used for precision work. Most of the hydraulic presses also required similar precision in manufacturing. e.g. Plastic Injection moulding machine, Powder compacting machine etc., and some components such as cylinders, guides, hydraulic valves etc., are if not made as per standard tolerance then even if press made for common operation such as crushing of scrap etc., will also not work.
Inside diameter of cylinder is selected as 10, 16, 25, 40, 63, 100, instead of 10,25, 50, 75, 100. Odd figure such as 16,63 etc., are given more preference overround and easy figure such as 25, 50, 75because 16 and 63 belongs to preferrednumber.
Ram dia, seal, capacity of press etc., are selected as per preferred number. Hence as a designer of machine tool and hydraulic press we must have basic knowledge of preferred number.
Hydraulic press works on high pressure hydraulic fluid which required to be sealed and press has so many moving components rubbing each other. If importance of surface finish is not understood, and surface roughness not measured and controlled correctly in manufacturing hydraulic cylinder and over-all press then even with best material used also, seals and guides will fail in very short period of time. In following paragraph we will study various allowable surface roughness and its measurement.