About CNC precision machining
principle and design process of the vertical degree of the axis of the measured element is the hole diameter, CNC precision machining datum elements is the axis of the orifice diameter, measured elements and reference elements are in the heart.
Line perpendicular to the line error of measuring principle, be measured axis by do 3 'diameter expanding mandrel simulation, datum axis mountain 20 less diameter expanding type spindle simulation.
Measurements, place the parts to be tested on a fixed and adjustable supporting, square close to the benchmark spindle Bi by adjustable bearing to adjust the clearance between the benchmark spindle and square, to ensure that the benchmark of spindle axis and the vertical plate.
In a distance of two mile readout Ge and in, the line perpendicular to the line error.
According to the principle of line perpendicular to the line error of measuring for line to line vertical degree of leaf of lang Chinese special fixture design.
CNC precision machining, the measured elements and benchmark are based on the axis of the orifice, choose according to the diameter of the hole on the corresponding measured axis, expanding type spindle simulation according to the diameter of the hole under the choice can be expanding type spindle simulation datum axis, use the clamping piece fixed square.
The whole line perpendicular to the line dedicated fixture structure is mainly composed of three parts, the base;
Positioning device: the distance, left and right column: the clamping device, composed of beams, knurled screw, main effect is clamping dial indicator.
The design process, the relevant parts size determined by the size of the parts to be tested, courageously some size according to the experience of manufacturing to determine, on the part drawing of size tolerance, form tolerance and surface roughness based on part tolerance selection principle to determine.
Done in software by the fixture design of a complete set of, auto machinery accessories processing including part three dimensional figure drawing, 3 d assembly fixture design, drawing and so on, through drawing the line perpendicular to the line of fixture mainly through the software to plot the line perpendicular to the line fixture, 3 d assembly drawing of the base for the installation of square clamping piece and fixed and adjustable supporting, benchmark the axis of the spindle should be perpendicular to the base plane.
So to flatness requirement is very high, when the design of flat high tolerance to 0.
01 mm is called the base plane relative to the base also has the parallel degree requirements, given the parallelism tolerance of 0.
02 mm, surface roughness value of beam is fixed and the main function of clamping dial indicator, auto machinery accessories processing installation of two dial indicator hole axis parallelism of the highly demanding, parallel degree of tolerance design is given to 0.
002 mm call distance, main effect is to locate in beam, the main purpose of the clamping block is fixed square, the square should guarantee the benchmark spindle axis is perpendicular to the base of li ping.
Adopting this fixture error between line perpendicular to the line, the key step is to ensure that the benchmark of the spindle axis is perpendicular to the base plane.
Therefore, to observe carefully when measuring benchmark spindle and square contact if there is a gap, if the benchmark spindle contact with square.
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