The three axes of the CMM are equipped with air source brake switches and micro-motion devices, which can realize precise transmission of single axis and adopt high performance. It is used in precision measurement of product design, mold equipment, gear measurement, blade measurement machinery manufacturing, steam mold parts, electronic appliances, etc.
A three-coordinate measuring instrument refers to an instrument that can express measurement capabilities such as geometric shape, length and circumferential indexing within the space range of a hexahedron, also known as a three-coordinate measuring bed. The three-coordinate measuring instrument can also be defined as "a detector that can move in three directions and can move on three mutually perpendicular guide rails. The detector transmits signals in a contact or non-contact manner. The displacement of the three axes is Measurement system data processor or computer, etc. to calculate the various points (x, y, z) of the workpiece and the measurement of various functions”. The measurement functions of the CMM should include dimensional accuracy, positioning accuracy, geometric accuracy and contour accuracy.
Model introduction
Length measuring system: RENISHAW open grating ruler with 0.1μm resolution
Probe system: Renishaw controller, Renishaw probe, Renishaw stylus
Machine: high-precision (00 grade) granite platform
Operating environment: temperature (20±2)℃, humidity 40%-70%, temperature gradient 1℃/m, temperature change 1℃/h
Air pressure: 0.4 MPa - 0.6 Mpa
Air flow: 25 L/min
Length accuracy MPEe: ≤2.1+L/350 (μm)
Probe ball precision MPEp: ≤2.1μm
Main features
The three-axis adopts natural high-precision granite guide rails, which ensures the same overall thermodynamic performance and avoids machine accuracy errors caused by different thermal expansion coefficients of three-axis materials.
Comparison between granite and aviation aluminum alloy
1. The thermal expansion coefficient of aluminum alloy material is large. Generally, after a few years of use of the beam and Z-axis of aviation aluminum alloy materials, the measurement reference of the three-coordinate - the grating ruler will be damaged and the accuracy will change.
2. Since the platform of the three-coordinate is a granite structure, the main axis of the three-coordinate is also a granite material. The main shaft is made of granite and the beam and Z-axis are made of aluminum alloy and other materials. When the temperature changes, the measurement accuracy will be distorted and stable due to the difference of the three axes.The three-axis guide rail adopts an all-natural granite rectangular structure that is fully surrounded on all sides, and is equipped with a high-precision self-cleaning prestressed air bearing, which is the basis for ensuring long-term and stable machine accuracy. Helps to ensure the life of the machine hardware.
3. The patented technology of air outlet through small holes is adopted, and the air consumption is 30L/Min. A condensation area is formed in the bearing gap, which offsets the heat caused by the friction of the bearing movement and increases the overall thermal stability of the equipment. Carefully study the technical indicators of each manufacturer, you will find that the air consumption of Outong Precision is 30L/Min, while that of other manufacturers is between 50-150L/MIN. According to the theory of physics, when the gas passes through the circular hole at a certain pressure At times, heat will be generated due to gas friction. In high-precision measurement, tiny heat will also affect the stability of accuracy. When the aperture of the air outlet is smaller than a certain diameter, it will be formed around the air outlet on the contrary. Condensation effect! It is precisely by using this physical principle and the technology of Ou Tong's small hole to make the condensation effect just offset the weak heat generated by the air friction during the measurement, so that the device can maintain long-term temperature stability, thus ensuring stable accuracy. sex!
Comparison of CMM Bearings from Major Suppliers
4. All three axes use the original gold-plated grating scale from RENISHAW, with a resolution of 0.1um; at the same time, one end is fixed and one end is free to expand and contract, which reduces the deformation of the grating scale.
5. The transmission system adopts the international advanced design, without any force and deformation of the guide rail, to ensure the accuracy and stability of the machine to the greatest extent. The steel wire reinforced synchronous belt transmission structure is adopted, which can effectively reduce the vibration during high-speed movement (increase), and has the characteristics of high strength, high speed and no wear.
6. The software is the industry benchmark RATIONAL-DMIS fully certified by PTB. It is powerful and easy to learn, allowing you to focus on product measurement instead of learning software.
There are large parts and assemblies that should not be moved (such as aircraft parts, transportation tools, construction machinery parts, large welded stamping parts, large forgings, large castings, etc.)
Requires a CMM
For those who do not have coordinate measuring equipment, but need to measure, the company can provide three coordinate measuring equipment rental (rental)
It is necessary to go to the outsourcing unit to test the product, and the outsourcing unit does not have three-coordinate measuring equipmentOnline detection and measurementGauge and fixture calibration and testing Automotive welding fixtures, fixture calibration and testingPipe fitting inspection and measurement
According to the structure of the three-coordinate measuring instrument, it can be divided into the following categories:
1. Moving bridge type
The mobile bridge type is the structure of the most commonly used three-coordinate measuring instrument. The axis is the main shaft moving in the vertical direction, and the box frame guides the main shaft moving in the direction along the horizontal beam. The horizontal beam is vertical to the axis and supported by two pillars at both ends. The beams and struts form a "bridge" that moves in the axial direction along two guide slots that are vertical and axial in the horizontal plane. Because both ends of the beam are supported by struts, minimal deflection can be obtained and higher precision than cantilever types can be obtained.
2.Bridgebedtype
Bed type bridge type, the shaft is the main shaft moving in the vertical direction, the box frame guides the main shaft to move along the beam of the vertical shaft, and the beam moves in the axial direction along the two horizontal guide rails, the guide rail is located on the upper surface of the pillar, and the pillar is fixed on the mechanical body. This type is the same as the moving bridge type, both ends of the beam are supported, so the deflection of the beam is minimal. This type has better accuracy than the cantilever type, because only the beam moves in the axial direction, so the inertia is smaller than when all the bridges move, and it is easier to operate manually than the mobile bridge type.
3. Gantrytype
Compared with the bed-type bridge type, the column-type bridge type is directly fixed on the floor, also known as the door type, which has greater and better rigidity than the bed-type bridge type. on a large CMM. Each axis is driven by a motor, the measurement range is large, and the operator can work in the bridge.
4. Fixed bridge type
Fixed bridge type, the shaft is the main shaft to move in the vertical direction, and the box frame guides the main shaft to move along the horizontal beam of the vertical shaft. The bridge frame (column) is fixed on the machine body, and the measuring table moves in the axial direction along the guide rail of the horizontal plane, and is perpendicular to the axis. Each axis is driven by a motor to ensure position accuracy, this model is not suitable for manual operation.
5.L-Shpaedbridgetype
L-shaped bridge type, this design is a change to make the bridge have the least inertia when the axis moves. Compared with the moving bridge type, the inertia of the moving components is less, so the operation is easier, but the rigidity is less.
6. Fixedtablecantileverarmtype
Shaft moving cantilever type, the shaft is the main shaft that moves in the vertical direction, the box frame guides the main shaft to move in the axial direction along the horizontal cantilever beam of the vertical shaft, and the cantilever beam moves in the axial direction along the guide groove on the horizontal plane, and is perpendicular to the shaft and axis. This type is open on three sides, which is easy to assemble and disassemble the workpiece, and the workpiece can be extended out of the table to accommodate larger workpieces, but the accuracy is not high due to the cantilever.
7. Single-pillar mobile type (Movingtablecantileverarmtype)
Single-column mobile type, the shaft is the main shaft moving in the vertical direction, the entire column moves on the axis along the guide groove on the horizontal plane, and the vertical axis is connected to the column. The measuring table moves on the axis along the guide groove in the horizontal plane, and the vertical axis and the axis. This type of measuring table, pillars, etc. have good rigidity, so the deformation is small, and the linear scale of each axis is close to the measuring axis, so as to comply with Abbe's theorem.
8. Single column measuring table mobile type (Singlecolumnxytabletype)
Single-column measuring table mobile type, the axis is the main shaft to move in the vertical direction, the column is attached with a shaft guide groove, and the column is fixed on the measuring instrument body. During measurement, the measuring table moves along the axis and the direction of the axis on the horizontal plane.
9. Movingtablehorizontalarmtype
Horizontal arm measuring table mobile type, the box frame supports the horizontal arm to move in the vertical (axis) direction along the vertical column. The probe is mounted on the cantilever in the horizontal direction, the pillar moves in the axial direction along the guide groove of the horizontal plane, and the vertical axis, and the measuring table moves in the axial direction along the guide groove of the horizontal plane, and is perpendicular to the axis and the axis. This is an improved design of the horizontal cantilever type, in order to eliminate the deflection of the horizontal arm in the axial direction due to extension or retraction.
10. Fixed table horizontal arm measuring table (Fixedtablehorizontalarmtype)
Horizontal arm measurement table fixed type, its structure is similar to the measurement table mobile type. This type of measuring table is fixed, and the shaft moves in the guide groove. When measuring, the pillar moves in the guide groove of the shaft, and the shaft sliding table moves in the vertical axis direction.
11. Horizontal arm moving type (Movingramhorizotatalarmtype)
In the horizontal arm mobile type, the shaft cantilever moves in the horizontal direction, and the box frame supporting the horizontal arm moves in the axial direction along the column, and the column is vertical to the axis. The column moves in the axial direction along the guide groove of the horizontal plane, and the vertical axis and the axis are not suitable for high-precision measurement. Unless the horizontal arm is extended or retracted, the error due to weight is compensated. In most cases it is used in vehicle inspection work.
12. Closed-loop bridge type (Ringbridgetype)
The closed-loop bridge type, because its driving method is in the center of the worktable, can reduce the impact caused by the movement of the bridge, which is the most stable type of all three-coordinate measuring instruments
