This standard specifies the requirements and inspection methods for presetting, geometric accuracy and working requirements of CNC heavy-duty lathes. JB/T 8325.1-1996 Simple heavy-duty horizontal lathe accuracy JB/T8325.1-1996 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
CNC Heavy Horizontal Lathe
Subject Content and Scope of Application
JB/T8325.1-96
This standard specifies the requirements and inspection methods for the presetting, geometric accuracy and working accuracy of CNC heavy horizontal lathes. This standard is applicable to general-purpose ordinary precision CNC heavy horizontal lathes with a maximum rotary diameter of 1000 to 5000mm on the bed and a maximum workpiece weight between the centers greater than or equal to 10t. 2 Reference standards
GB1183 Terms and definitions of shape and position tolerances GB4380 Methods for determining roundness errors Two-point and three-point methods GB10931 Methods for evaluating the position accuracy of digitally controlled machine tools JB2670 General rules for precision inspection of metal cutting machine tools 3 General requirements
3.1 Refer to 3.1 in JB2670 to adjust the installation level, place the slide in the middle of the bed rail, and place a level at both ends of the machine rail. The readings of the level in the longitudinal and transverse directions shall not exceed 0.06/1000. 3.2 The pre-adjustment inspection is only carried out during assembly, and no re-inspection is required after the load test. 3.3 During the precision inspection of the machine tool, the ambient temperature should be maintained within 20℃±5℃, and should meet the following requirements: a. Before the inspection, the machine tool should be in an isothermal environment of not less than 12h b. The temperature gradient at any point in the space occupied by the machine tool shall not exceed 0.5℃/h. 3.4 During inspection, the actual inspection sequence can generally be arranged according to the requirements of assembly and disassembly inspection tools, inspection convenience, and thermal inspection items. 3.5 During the working accuracy inspection, the test piece should be inspected after fine turning. 3.6 When the actual measured length is different from the length specified in this standard, the tolerance should be converted according to the measurable length in accordance with the provisions of 2.3.1.1 in JB2670. When the conversion result is less than 0.005mm, it shall still be calculated as 0.005mm. 3.7 The direction parallel to the bed rail is called the longitudinal direction, and the direction perpendicular to the bed rail is called the transverse direction. 3.8 The motion axis code of the machine tool is shown in Figure 1. z+
Approved by the Ministry of Machinery Industry of the People's Republic of China on April 11, 1996, implemented on October 1, 1996
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