How does the coordinate measuring machine fix the workpiece?

How does the coordinate measuring machine fix the workpiece?

　　In the process of using a coordinate measuring machine, the workpiece needs to be placed on the worktable stably and cannot be affected by other external forces. Therefore, the stability of the placement of the workpiece has a great influence on the final measurement result. The fixing methods for different workpieces are not the same. Below, Miaoji Precision will share with you the commonly used fixing methods.

　　1. Classification according to the fixing method:

　　 Bonding and fixing: the parts can be directly bonded and fixed on the table with a glue gun. This kind of fixing method The advantage is that the workpiece will not be deformed due to the clamping force, but it must be remembered that the feature directly in contact with the table is inaccessible. After the measurement, the glue should be removed with an appropriate solvent. The main disadvantage is that the adjustment is made by visual inspection. There is inaccuracy in the direction of the workpiece.

　　 Fixture fixation: During the measurement process, the fixture can be used to install the workpiece to make the parts easy to locate. The clamping system will not deform the workpiece. It should be ensured that all measured features are accessible during use, so that the measurement time can be shortened. The fixed fixture is now widely used in the measurement process of the coordinate measuring machine.

　　2. Classification according to the shape and weight of the workpiece:

　　Light parts: For small light parts, plasticine, instrument wax and other materials can be used to fix the parts, but the user should ensure that the Remove all traces from the machine and parts after the measurement. In some cases, it is necessary to use mechanical methods to fix the parts on the CMM. The user should know that the clamping force will cause deformation of the parts, so care must be taken not to over-clamp it. It is recommended to use a soft cushion between the fixture and the part. Magnetic and vacuum chucks can also be used as another clamping method.

　　Heavy parts: If the tested part is heavy enough that it can be stably placed on the machine table without any clamping device; the user should know that the part is in a free state during the measurement, that is, it is not needed With any safety device, the workpiece will not be displaced, but the operator must know that heavy parts will inevitably cause the machine to deform.

　　 The above are several fixing methods used by the coordinate measuring machine in different situations. The appropriate fixing method must be selected according to the measurement requirements and material characteristics, so as to reduce the measurement error and improve the accuracy of the measurement . At present, Miaoji Precision can provide a variety of high-precision coordinate measuring machines. Welcome to consult.