24
2022
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03
HOW THE WORK PIECES ARE CLAMPED IN CMM MEASURING PROCESS ?
In the machining process,in order to ensure the measuring accuracy of the workpiece,at the beginning of measuring,the position of the workpiece on the worktable should be determined and fixed for inspection.The process of positioning and clamping the workpiece on the coordinator measuring machine workbench is called clamping
1.The definition of the workpiece clamping.
In the machining process,in order to ensure the measuring accuracy of the workpiece,at the beginning of measuring,the position of the workpiece on the worktable should be determined and fixed for inspection.The process of positioning and clamping the workpiece on the coordinator measuring machine workbench is called clamping.
2.How to ensure the shape of the workpiece in the clamping?
a.To ensure that the assembly components and each of its parts are in the same shape when they are in use,and the product must not be deformed during clamping.
b.For better rigid assembly components,it should be naturally placed on the bracket and be processed.For flexible or deformed workpieces,their shape should be restored to the stage of the used stage and then install them on the bracket for fixation.
C.Auxiliary tools such as brackets and spacers should be used to ensure the rigidity of each part and the entire assembly.Special attention should be paid to ensure that each part is not deformed when disassembling layer by layer.
3.Clamping Position
Place the workpiece within the CMM,if the measurement cannot be completed in one clamping position,it can be positioned multiple times,which is called re-positioning.Relocation should pay attention to the following principles:
a.Maximize the measurement range in each measuring to reduce the number of re-locations.
b.The maximum measuring area should between each positioning and a previous positioning to ensure the accuracy of positioning setting and re-positioning transformation.
c.The re-loction transformation(that is the coordinate transformation from each location to the first location)should be minimized as much as possible to reduce accumulated errors.
d.It should be easy to operate the workpiece measuring and place the complex workpiece in the in a position where it is easy to measure.
e.The key measuring surfaces should be placed horizontally or vertically as possible,and the symmetry plane of the workpiece should be as parallel to the coordinate plane of the measuring machine as possible.
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