Three coordinate measuring instrument PCB introduction

2021-10-28

Author：Downs

The following is the introduction of the three coordinate measuring instrument PCB board:

Instrument introduction:

A three-coordinate measuring machine refers to an instrument capable of measuring geometric shapes, lengths, and circular divisions within the space of a hexahedron. It is also called a three-coordinate measuring machine or a three-coordinate measuring bed. The three-coordinate measuring instrument can also define "a detector that can move in three directions and can move on three mutually perpendicular guide rails. This detector transmits signals in contact or non-contact, etc., the displacement of the three axes The measuring system (such as grating ruler) calculates each point (x, y, z) of the workpiece and the instrument for measuring various functions through a data processor or computer." The measurement function of the three-coordinate measuring instrument should include PCB dimensional accuracy, positioning accuracy, geometric accuracy and contour accuracy.

Functional principle:

pcb board

Simply put, a coordinate measuring machine has a guiding mechanism, a length measuring PCB component, a digital display device in three mutually perpendicular directions, and a worktable that can place the workpiece (large and giant may not be available), and the probe can It is a kind of measuring equipment that is moved to the measured point briskly by manual or motorized method, and the coordinate value of the measured point is displayed by the reading device and the digital display device. Obviously this is the simplest and most primitive measuring machine. With this measuring machine, the coordinate value of any point in the measuring volume can be displayed by the reading device and the digital display device. The measuring point sending device of the measuring machine is a measuring head, which is equipped with a grating ruler and a reading head in the directions along the X, Y, and Z axes. The measurement process is that when the probe touches the workpiece and sends out the point sampling signal, the control system collects the coordinate value of the current machine tool's three-axis coordinates relative to the machine origin, and then the computer system processes the data.

Instrument features:

1. The integral granite workbench has the characteristics of strong load-bearing capacity, wide space for workpiece placement, and convenient loading and unloading;

2. The three-axis guides are made of high-quality granite, so that the three-axis has the same temperature characteristics, so it has good temperature stability, resistance to aging deformation, good rigidity, and minimal geometric deformation;

3. The application of the nonlinear spring system reduces the influence of the small error of the guide rail on the measurement accuracy, and at the same time ensures that the equipment has a higher environmental temperature adaptability;

4. All the guide rails adopt high-precision air bearings, and the encircling guide rail design improves the rigidity and stability of the machine, and can maintain high accuracy even after long-term work, ensuring the excellent dynamic characteristics of the machine

5. Z-axis torsion is an important part of determining the accuracy of the measuring machine. The reliable anti-rotation structure design makes it possible to obtain high accuracy even when using the probe extension rod.

6. The Z axis adopts a gravity balance device, which is highly reliable, and the movement is more stable and smooth.

7. Three-axis rapid movement, locking and fine adjustment adopt one-key conversion. Just flip the corresponding switch of the air locking device gently to switch each axis from the fast moving state to the locked state. After locking, the axes can be easily moved by the X, Y, Z axis fine-tuning knobs. This function is particularly sufficient when inspecting the narrow parts of the workpiece;

8. The PCB length measurement system adopts imported high-precision reflective metal strip grating ruler and reading head, which has extremely high precision and precision stability;

Technical index:

1. Measuring range: X=500mm, Y=600mm, Z=400mm

2. Indication error of spatial measurement: E≤3.5+L/250μm

3. Resolution: 0.5μm

4. Maximum bearing weight: 300kg

5. Instrument weight: 550kg

6. Dimensions: x=950mm, y=1050mm, z=2000mm

7. Environmental requirements:

Temperature range: 20±2 degree Celsius, 0.5 degree Celsius/h

Air source pressure: 0.6MPa-0.8MPa, 200L/min (0.4MPa)

Humidity range: 45%-65%

Power supply: 220V±10%,50Hz