For CNC lathes, this book is based on the national standard GB/T 16462-1996 "CNC Horizontal Lathe Accuracy Test".
(A), roundness: change of the radius of the test part close to the shaft end of the spindle; the consistency of the diameter of the cutting process: the change between the diameter of each ring of the test part.
1, inspection methods
Precision test specimens that are held on a standard workpiece holder. The single-edged tool is mounted on one station of a rotary tool holder.
The materials and types of inspection parts, the type and shape of the cutting tools, the feed rate, the depth of cut, and the cutting speed are all specified by the manufacturer, but should comply with the relevant national or industry standards.
2, diagram
L=0.5 maximum turning diameter or 2/3 maximum turning stroke.
Range 1: Up to 250
Range 2: Up to 500
Dmin=0.3L
Figure 5-8 The consistency of roundness and cutting diameter
3. Tolerance
Range 1: Maximum 250:
Roundness: 0.003
Consistency in cutting diameter: 0.020 on length 300
Range 2: Maximum 500:
Roundness: 0.005
Consistency in cutting diameter: 0.030 in length
The difference between adjacent zones should not exceed 75% of the measurement difference between the two zones.
(B), the flatness of the surface finisher
1, inspection methods
The end face of the specimen held by the finishing carriage on a standard workpiece holder. The single-edged tool is mounted on a station on a rotary tool holder.
The materials and types of inspection parts, the type and shape of the cutting tools, the feed rate, the depth of cut, and the cutting speed are all specified by the manufacturer, but should comply with the relevant national or industry standards.
2, diagram
Dmin=0.5 maximum turning diameter
Figure 5-9 Flatness test of the end face of a finishing car
3. Tolerance
300 on the diameter of 0.025 only allowed concave
(c), pitch accuracy
1, inspection method
Use a single-edged tool thread. V-thread shape: The thread pitch should not exceed half of the lead screw pitch.
The material, diameter of the test piece, pitch of the screw thread together with the form and shape of the tool, feed amount, depth of cut and cutting speed are all specified by the manufacturer, but should comply with the relevant national or industry standards.
Note:
(1) The thread surface should be smooth or concave.
(2) Typical specimens with an outer diameter of 50, a length of 75, and a pitch are generally satisfactory for most machine tools without a screw.
2, diagram
Lmin=75 D screw diameter
Figure 5-10 Pitch accuracy test chart
3. Tolerance
Any 50 measurement length is 0.01.
(d) Deviations between the turning profile and the theoretical profile at the transition point of each axis
1, inspection method
Under digital control, the contour of the specimen was turned with a single-edged tool.
The material, diameter of the test piece, pitch of the screw thread together with the form and shape of the tool, feed amount, depth of cut and cutting speed are all specified by the manufacturer, but should comply with the relevant national or industry standards.
2, diagram
For the shaft lathe, see Figure 5-11 Deviation of shaft lathe contour.
The dimensions shown only apply to the range 2: up to 500.
For range 1: The size of a maximum of 250 machines can be scaled down by the manufacturer.
Figure 5-11 Checking the deviation of the shaft lathe contour
For the disc lathe, see Figure 5-12 Deviation of the disc lathe profile.
Figure 5-12 Checking the deviation of the disc lathe contour
3, tolerance
Range 1: Maximum 250: 0.030
Range 2: Max. 500: 0.045
(five), the change of the profile of the reference radius, the size of the diameter, and the roundness error
1, inspection methods
Turn a test piece with Program 1 or Program 2 .
Procedure 1:
15° is used as a block to turn the sphere from 0° to 105° (ie 7 blocks), without using the tip radius compensation.
Procedure 2:
Only one program (1°~105°) is used to turn the spherical surface without using the tip radius compensation.
Process:
(1) The stock allowance of the blank before finishing is 0.13.
(2) Finish the test piece NO.1 to the required size.
(3) Without adjusting the machine tool, test pieces NO.2 and NO.3 are finished to the required dimensions.
2, diagram
Figure 5-13 Inspection curve of the change of the radius of the reference radius, the size of the diameter, and the roundness error
3. Tolerance
size
Range 1
Range 2
<100
0.008
-
<150
0.010
-
<250
0.015
-
<350
-
0.020
<500
-
0.025
<750
-
0.010
0.003
0.035
0.020
0.005
Note:
(1) The surface roughness reached by the test piece is to be recorded.
(2) The precision of the tool tip arc radius must reach twice the input resolution of the machine tool, and the rake angle of the tool is 0°.
(3) A tight, stable material (such as an aluminum alloy) must be used to obtain a satisfactory surface roughness.
(4) Repeated positioning accuracy under load conditions can be obtained by comparing these three test pieces.
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