cold extrusionExtrusion hydraulic pressAccuracy requirements
This standard applies to vertical metal extrusion hydraulic press.
Basic requirements for cold extrusion hydraulic press
Datum for 1.1 accuracy inspection
1.1.1 The worktable is the inspection datum plane for the final assembly accuracy of the hydraulic press.
1.1.2 When the hydraulic press has a working table, the plane of the working table is the inspection reference plane for the final assembly accuracy of the hydraulic press. Workbench:
A. the flatness tolerance of the upper plane and the lower plane is 0.015 ^ ^ M
B the parallelism tolerance of the upper and lower planes is 0.015 p l!
Conditions for Accuracy Inspection of 1.2 Cold Extrusion Extrusion Hydraulic Press
1.2. 1 Before the accuracy inspection, the cold extrusion extrusion hydraulic press shall be adjusted horizontally, and the levelness deviation of its worktable shall not exceed 0.20/1 000mm.
2 The accuracy inspection of the hydraulic press shall be carried out after the idle operation and full load operation tests respectively, and the full load operation test value shall be recorded in the factory certificate of conformity.
1.2.3 In the process of hydraulic press accuracy inspection, it is not allowed to adjust the institutions and parts that affect the accuracy, otherwise, the relevant items affected by the adjustment shall be rechecked.
1.2.4 Before the final assembly accuracy inspection, for the frame structure, the adjustment principle of k between the sliding block and the guide rail shall ensure that the final assembly accuracy guide rail does not generate heat, does not pull hair and can form an oil film.
Requirements of 1.3 cold extrusion hydraulic press for gauge
1.3.1 The length of the square ruler should be greater than the actual detection length.
1.3.2 The level shall not be lower than the first-class accuracy of JB 2214-77 Inspection Level.
1.3.3 The 90 square shall not be lower than the level 0 accuracy of JB 2213-77 "90 square.
1. 3. 4 Percentable meter shall not be lower than the first-class accuracy of GB 1219-75 "Percentable Meter.
1.3.5 The level shall not be lower than 02/1mm J of JJG 38-77 "Verification Regulations for Frame Level and Fitter Level"
1.4 Under the condition of meeting the requirements of various tolerance values, other inspection tools and equivalent methods can be used for precision inspection.
1.5 cold extrusion extrusion hydraulic press precision tolerance calculation method and mantissa rounding.
The precision tolerance value of each inspection item shall be calculated according to the formula listed in the tolerance column. The calculation result shall be less than 5 in microns and less than 10 in microns.
Code in 1.6 Standards
L is the length (mm) of the detection surface.
U is the measured length of the detected surface (mmhhsL-ZZ.
U is the measured length of the lower plane of the slider (mm),L2 = L -2Z.
1. 6. 4 L3 is the stroke of the slider (mm).
1.6.5 U is the support distance from the center of the slider (mm),L4 = L/3.