Accuracy of press machine
In various industries, the press machine is widely used, both Mechanical Press Machine and Hydraulic Press Machine which uses hydraulic systems. Basically the press machine, both hydraulic press, and mechanical press serves to do pressing or stamping, for processes, such as drawing, punching, blanking, fittings, shearing, bending, forging, etc.
In the hydraulic press machine, a fluid system is used to raise and lower the slides. In this case, the oil, which serves as a medium, flows to the hydraulic cylinder as well as the die cushion system. All fluids are controlled by using a hydraulic valve.
This fluid system is driven by a Hydraulic pump (gear pump, vane pump or piston pump) which functions to pump oil from the tank which then forwarded to the cylinders. To control the size of the pressure, the speed of movement of the cylinder, etc., many valves are used.
Among these valves, are the solenoid, check valve, relief valve, etc. Because using the hydraulic system, this machine can be easily set or adjusted. These settings are; its movement and power settings, but for power settings, the power generated depends on the power of the motor used to drive the hydraulic pump.
On the other hand, a mechanical press machine uses a mechanical system with a flywheel which is driven by an electromotor, which is forwarded to the crankshaft which then moves the slides to go up and down. Control position of the slide movement using the clutch and brake system, where the power used is pneumatic. Pneumatic systems on this machine are often used as balancers and die cushion.
Because of this, air tubes can often be seen to be either mounted on the top (crown deck), under the engine or behind the engine. The power generated by these two types of press machines is quite varied, ranging from press machines generate power of 20 tons up to thousands of tons. However, the mechanical press machine which circulates in the Indonesian market only generates power up to 2500 tons, unlike the hydraulic press machines.
For large press machines, the machine usually divided into several parts. This is done to facilitate the installation process because it is massive in size and weight (above 40 tons). These parts consist of Bed, Side Frame, Crown, Slide, Cylinder Hydraulic Bolster, Panels, and other Accessories. When going to do the installation process that needs to be checked is the parallel level of the base plate (the base plate must have the same thickness or as close as possible). Do not let the base plate position have a big difference in height, because it will make it difficult when leveling the bed.
Keep in mind that, the positi
on of the bed, set during installation must strictly follow the premade setting (refer to installation manual), the premade setting is the critical point for the leveling and each manufacturer usually has little to no distinction in the setting.
If the leveling does not have any premade setting, then do not continue the frame installation work. Failure to set the level or slope of the bed properly could affect the machine’s performance and could weaken the machine itself. And when the accuracy of the slide position is set, the bolster and will not work in conjunction with other parts. This leveling is set to measure the Accuracy of the flatness of the bolster surface. To determine the standard of this measurement, refer to JIS-B6403.
Events that are often encountered when the engine has been installed/used for a long time (above 5 years), this accuracy setting needs to be done, and often the settings have done are the parallel settings and gap of slide settings. And it is uncommon to check its level setting, and if the engine has a particular problem especially when the product is inconsistent if dies/moldings have been standardized, checks and settings only did to parallels settings and gap of slide settings.
If no problem is found after checking and setting, then check the level of the machine and if the level is not on its standard settings, steps that are often done is to flattening the surface of the bolster by grinding the surface of the bolster with a thickness that is adjusted to the results of the level check. The thickness of the bolster should not be the same or tilted, the tilt is adjusted with the slope of the machine.
If this step is carried out within 2-4 years, there will be wear on the slide which makes the gap of the slide very difficult to set, and forcing it could cause the machine to experience fatal damage/total failure. Because of this, the problem in the level of the machine is to be taken seriously. As stated above, if leveling is the main problem, it must be resolved properly and adjusted to its standard settings. Do not resolve the problem by doing adjustment to the machine’s parallels settings, surfacing grinding bolster, the gap of slide or perpendicular settings.
Measuring the accuracy of press machine:
- Accuracy the flatness of the bolster surface
- Accuracy of parallelism between bolster and slide
- Accuracy of Perpendicular between bolster and Slide movement
- Clearance between slide guides and gibs
Accuracy of press machine
Accuracy of press machine, bending press, Hydraulic breaker, Leveling Machine, Mechanical Press, Mesin hydraulic press, Mesin Press, shrinking, Trimming
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