JB/T 3556-1999 This standard is a revision of JB 3556-8 "Accuracy of rotary tables of modular machine tools". During the revision, only editorial changes were made according to relevant regulations, and the technical content remained unchanged. This standard specifies the geometric accuracy requirements and inspection methods of rotary tables of modular machine tools. This standard is applicable to indexing rotary tables of modular machine tools and their automatic lines. This standard was first issued in 1983. JB/T 3556-1999 Accuracy inspection of rotary tables of modular machine tools JB/T3556-1999 Standard download decompression password: www.bzxz.net

ICS25.060.99
Machinery Industry Standard of the People's Republic of China
JB/T3556—1999
Modular Machine Tools
Precision Inspection
Rotary Table
Published on 1999-05-20
National Bureau of Machinery Industry
Implemented on 2000-01-01
JB/T3556—1999
This standard is revised on the basis of JB3556-83 "Precision of Rotary Table of Modular Machine Tools". The technical content of this standard is consistent with that of JB3556-83, and it has only been re-edited according to relevant regulations. This standard replaces JB3556-83 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 Modular Machine Tool Branch of the National Technical Committee for Standardization of Metal Cutting Machine Tools. The responsible drafting unit of this standard: Dalian Modular Machine Tool Research Institute. This standard was first issued in 1983.
1 Scope
Machinery Industry Standard of the People's Republic of China
Modular Machine Tools
Precision Inspection of Rotary Tables
This standard specifies the geometric accuracy requirements and inspection methods for rotary tables of modular machine tools. This standard applies to indexing rotary tables of modular machine tools and their automatic lines. 2 Referenced Standards
JB/T3556—1999
Replaces JB3556-83
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 are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T17421.1-1998 General Rules for Machine Tool Inspection Part 1: Geometric Accuracy of Machine Tools under No-load or Finishing Conditions 3 Brief Description
3.1 When using this standard, the relevant provisions of GB/T17421.1 should be referred to. 3.2 The order of accuracy inspection items listed in this standard does not represent the actual inspection order. In order to reduce the loading and unloading of inspection tools and facilitate inspection, they can be carried out in any order.
3.3 The inspection tools and instruments specified in this standard are arbitration. In production, any other inspection tools and instruments may be used under the premise of ensuring inspection accuracy.
Approved by the State Machinery Industry Bureau on May 20, 1999, and implemented on January 1, 2000
4 Geometric accuracy inspection
Inspection items
Face of faceplate working surface
≤400
Accuracy level
Ordinary grade Precision grade
Inspection tools
Inspection ruler
Conformal pads
Adjustable gauge block
Inspection platform
Inspection method
Refer to the relevant provisions of GB/T17421.1-1998
Take points a, b, and c on the edge of the faceplate as reference points, and place an equal-height pad on each of the three points. Place the inspection ruler on points a and c, and place an adjustable gauge block on point d, and make it contact with the working surface of the ruler; then place the ruler on points bd, and place an adjustable gauge block on point e, and make it contact with the working surface of the ruler. Then place the ruler on the gauge blocks in the eight directions shown by the measuring line one by one, and use the adjustable gauge blocks to check the gap between the working surface of the faceplate and the ruler at least in the middle and at both ends of the ruler. The difference between the maximum and minimum gaps is taken as the measured value.
Note: When measuring the gap, the adjustable gauge block at point d can be removed
Inspection items
Parallelism of the working surface of the faceplate to the base surface of the worktable
≤400
Accuracy level
Ordinary level
Precision level
Inspection tools
Indicator
Inspection platform
Inspection method
Refer to the relevant provisions of GB/T17421.1-1998
5.4.2.2.1
Fix the indicator on the inspection platform
so that its probe is vertically pressed against the working surface of the faceplate
at a distance of 25~30mm from the edge of the faceplate. Rotate the worktable to position and clamp it. Measure at four or more evenly distributed points on the faceplate working surface. At each measuring point, record the faceplate reading at each workstation in sequence. Then move the indicator along the inspection platform to the next measuring point. When measuring, place a gauge block under the probe.
Take the maximum algebraic difference of the indicator's readings at two relative points on the diameter as the measuring
inspection item
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≤400
Accuracy level
Ordinary grade
Precision grade
Inspection tool
Indicator
Inspection platform
Inspection method
Refer to the relevant provisions of GB/T17421.1-1998
Fix the indicator on the inspection platform
so that its probe is vertically pressed against the working surface of the faceplate
at a distance of
25~30mm from the edge of the faceplate. After rotating the faceplate, stopping, positioning and clamping it at each station, record the indicator reading. When measuring at more than four measuring points evenly distributed on an arc of 180°, place a measuring block under the probe, the thickness of which must be greater than the lifting height of the faceplate when it rotates.
The maximum algebraic
difference of indicator readings is taken as the measured value
Inspection items
Radial installation of faceplate
≤400
Accuracy level
Ordinary grade
Precision grade
Inspection tools
Indicator
Inspection rod
Inspection platform
Inspection method
Refer to the relevant provisions of GB/T17421.1-1998
5.6.1.2.3
Insert the inspection rod into the process
hole of the faceplate. The two indicators are fixed perpendicularly to each other and their probes are vertically pressed against the cylindrical surface of the inspection rod. Rotate the faceplate
and position it at each station
. Note the readings of the two indicators at each station
. Calculate the maximum algebraic
difference of each indicator reading when the faceplate rotates one circle
. The maximum algebraic
difference of the indicator readings is taken as the measured value.
(This test is not applicable to workbenches with multiple toothed discs and workbenches without central processing holes)
Test items
Division accuracy of workbench
Disk diameter
>320~400
>400~500
>500-630
>630-800
>800~1000
>1000-1250
>1250-1600
>1600-2000
Accuracy level
Ordinary levelPrecision level
Test methods
Test tools refer to GB/T17421.1-1998 related provisions
polyhedron
autocollimator
fix
a polyhedron whose number of faces is equal to the number of workbench positions
test platform
or an integer multiple thereof,
place
an autocollimator
on the outside of the workbench. Make the workbench faceplate rotate
and stop
at each workstation, position
and clamp. Use the autocollimator
to measure
the actual rotation angle of the faceplate.
The maximum
algebraic difference of the autocollimator reading is taken as the measured value
Mechanical industry standard
Modular machine tool
Precision inspection of rotary table
JB/T3556—1999
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)*
1/16 Printing sheet 3/4 Number of words 14.000
Format 880×1230
First edition in July 1999
First printing in July 1999
Print run 1-500
Price 1000 yuan
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