JB/T 2255.2-1999 This standard is a revision of ZB J54 022-89 "Technical conditions for jig boring machine rotary tables". During the revision, only editorial changes were made according to relevant regulations, and the technical content remained unchanged. This standard is a concretization and supplement to GB/T 9061-1988 "General technical conditions for metal cutting machine tools" and other standards. This standard is part of the JB/T 2255 "Jig boring machine rotary table" series of standards, which includes the following two parts: JB/T 2255.1-1999 Jig boring machine rotary table accuracy inspection JB/T 2255.2-1999 Jig boring machine rotary table technical conditions This standard specifies the manufacturing and acceptance requirements for jig boring machine rotary tables. This standard applies to horizontal rotary tables and universal rotary tables for jig boring machines with a rotary table diameter less than or equal to 1500mm. This standard was first issued in March 1989. JB/T 2255.2-1999 Technical requirements for rotary tables of jig boring machines JB/T2255.2-1999 Standard download decompression password: www.bzxz.net

ICS25.080.20
Machinery Industry Standard of the People's Republic of China
JB/T2255.2—1999
Technical Conditions for Rotary Tables of Jig Boring Machines
Published on 1999-05-20
National Bureau of Machinery IndustrybzxZ.net
Implemented on 2000-01-01
JB/T2255.2—1999
This standard is a revision of ZBJ5402289 "Technical Conditions for Rotary Tables of Jig Boring Machines". During the revision, only editorial changes were made according to relevant regulations, and the technical content remained unchanged.
This standard is a concretization and supplement to GB/T9061—1988 "General Technical Conditions for Metal Cutting Machine Tools" and other standards. This standard is part of the JB/T2255 "Rotary Tables for Jig Boring Machines" series of standards. This series of standards includes the following two parts: JB/T2255.1—1999
Testing of the rotary table of a jig boring machine
JB/T2255.2—1999
Technical conditions for the rotary table of a jig boring machine
This standard replaces ZBJ54022-89 from the date of implementation. This standard is proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of the Jig Boring Machine Branch of the National Technical Committee for Standardization of Metal Cutting Machine Tools. The responsible drafting unit of this standard: Kunming Machine Tool Co., Ltd. This standard was first issued in March 1989.
1 Scope
Machinery Industry Standards of the People's Republic of China
Rotary table of a jig boring machine
Technical conditions
This standard specifies the requirements for the manufacture and acceptance of rotary tables for jig boring machines. JB/T2255.2-1999
Replaces ZBJ54022—89
This standard applies to horizontal turntables and universal turntables for coordinate boring machines with a turntable surface diameter less than or equal to 1500mm. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T9061—1988
General technical conditions for metal cutting machine tools
GB/T16769-1997 Method for measuring sound pressure level of noise for metal cutting machine toolsJB/T2255.1—1999
Testing accuracy of rotary tables for jig boring machines
JB/T9872—1999
JB/T98741999
3 General requirements
General technical conditions for machined parts of metal cutting machine toolsGeneral technical conditions for assembly of metal cutting machine tools When accepting machine tools according to this standard, the remaining acceptance items in GB/T9061, JB/T9872, JB/T9874 and other standards that have not been concretized in this standard must be inspected at the same time.
4 Processing and assembly quality
4.1 The sliding (rolling) guide rails, spindles, worm gears, etc. of the turntable must take wear-resistant measures that are suitable for the service life. 4.2 The hardness of the sliding (rolling) guide rail surface of ordinary gray cast iron shall not be less than 190HBS4.3 When the worktable surface is a scraped surface, the color coating method shall be used for inspection, and the number of points within 25mm×25mm shall not be less than 20 points. The roughness R value of the worktable surface processed by mechanical processing methods shall comply with the provisions of the design drawings. 4.4 The sliding (rolling) guide rail surface and the worktable surface shall not be welded. 4.5 In addition to the color coating method, the bottom surface of the turntable base shall also be inspected with a 0.03mm feeler gauge before and after tightening, and no insertion shall be made. Random turntables should be inspected on the worktable of the main machine: non-random turntables are only inspected in the non-tightened state on the inspection platform. 4.6 The positioning operating mechanism of the turntable should be flexible and accurate. The reverse idle stroke of the table indexing handle (wheel) should not exceed 1/40r. 4.7 The operating force of the turntable indexing handle shall be assessed according to Table 1. Table 1
Diameter of turntable working surface
≤320
>320-630
>630-1000
Approved by the State Machinery Industry Bureau on May 20, 1999 Handle operating force N
Implementation on January 1, 2000
4.8 The optical system shall meet the following technical requirements: JB/T2255.2—1999
a) The lines in the optical field of view shall be clear and the illumination shall be uniform, without any reflection that disrupts vision; b) The image on the light screen shall coincide with the graticule, and there shall be no parallax perceptible to the naked eye; d) The lines of the precision scale shall be basically consistent in thickness when projected on the light screen; d) The lines of the graticule shall be straight and uniform in the field of view, and the thickness of the projected image shall be basically consistent with that of the scale lines, and the tolerance shall not be greater than the minimum reading value.
4.9 The digital display turntable should be equipped with a digital display device that is compatible with the coordinate boring machine, and must have stable accuracy and reliable performance. 5 Idle operation test of the motorized turntable
5.1 The motorized turntable should be tested for an idle operation for a certain period of time according to the design requirements before the geometric accuracy is inspected. There should be no obvious vibration and creeping during operation.
5.2 The noise of the motorized turntable should be tested in accordance with GB/T16769. The measurement of the turntable noise should be carried out under idle operation conditions. The sound pressure level of the turntable noise shall not exceed 70dB(A).
6 Accuracy inspection
6.1 Accuracy inspection shall be carried out in accordance with JB/T2255.1. 6.2 When checking the table indexing accuracy, the change of the table clamping angle before and after and the clamping reliability should also be checked. The value is no more than 2" for Class I accuracy and no more than 3" for Class IⅡ accuracy
Mechanical Industry Standard
Technical Conditions for Rotary Tables of Jig Boring Machines
JB/T2255.21999
Published and distributed by the Machinery Standardization Research Institute of the Ministry of Machinery Industry Printed by the Machinery Standardization Research Institute of the Ministry of Machinery Industry (No. 2 Shouti South Road, Beijing: Postal Code 100044)*
Format 880×1230
X Number of characters xXX,XXX
Sheet X/X
Xth printing in XX month of 19XX
Xth edition in XX month of 19XX
Number of prints 1-XXX
Price XXXXX Yuan
XX-XXX
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