JB/T 3044-1999 This standard is a revision of JB 3044-82 "Precision of modular machine tool fixtures". 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 for modular machine tool fixtures. This standard is applicable to fixtures for modular machine tools and their automatic lines. This standard was first issued in 1975 and revised for the first time in 1982. JB/T 3044-1999 Precision inspection of modular machine tool fixtures JB/T3044-1999 standard download decompression password: www.bzxz.net

ICS25.060.99
Machinery Industry Standard of the People's Republic of China
JB/T3044—1999
Modular Machine Tools
Testing of Fixture Accuracy
Published on 1999-05-20
National Bureau of Machinery Industry
Implemented on 2000-01-01
JB/T3044—1999
The standard is revised on the basis of JB3044-82 "Precision of Fixtures for Modular Machine Tools". The technical content of this standard is consistent with that of JB3044-82, and it has only been re-edited according to relevant regulations. This standard replaces JB3044-82 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 1975 and revised for the first time in 1982. 1
1 Scope
Machinery Industry Standard of the People's Republic of China
Modular Machine Tools
Fixture Accuracy Inspection
This standard specifies the geometric accuracy requirements and inspection methods for modular machine tool fixtures. This standard applies to fixtures for modular machine tools and their automatic lines. 2 Cited Standards
JB/T3044—1999
Replaces JB3041-82
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 General Requirements
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, inspections 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.
3.4 ​​If there are special requirements, additional provisions may be made. 3.5 Place the fixture on a flat plate and carry out various accuracy inspections. Approved by the State Bureau of Machinery Industry on May 20, 1999 and implemented on January 1, 2000
4 Geometric accuracy inspectionbzxZ.net
Inspection items
Parallelism of the upper plane of the clamp body to
its base
Equal height of the upper plane of the supporting plate to
the base of the clamp body
Ordinary grade
>250||>500
L≤250
L≤250
L≤250
L≤250
L≤250
L≤250
||Precision grade
>250>500
Ordinary grade
L>250|L>500
Precision grade
>250
Inspection tools
Indicator
Indicator
Inspection method
Refer to the relevant provisions of GB/T17421.1—1998
5.4.1.2.2
Place the indicator on the flat plate and
make its probe vertically press against the upper plane of the fixture body
. Move the indicator to perform inspection.
Take the maximum reading difference of the indicator
as the measured value
5.4.3.2.1
Place the indicator on the flat plate and
make its probe vertically press against the upper plane of the supporting plate
. Move the indicator and
carry out the inspection on the two supporting plates.
Take the maximum reading difference of the indicator
as the measured value
JB/T3044-1999
Inspection items
Locate pin pair
Radial runout of push rod
Rolling guide
Radial runout of hole
Accuracy grade
Ordinary gradePrecision grade
Accuracy grade
Ordinary grade
Precision grade
Inspection tools
Indicator V-shaped frame, indicator, test rod, test method, refer to the relevant provisions of GB/T17421.1-1998. 5.6.1.2.2 Place a V-shaped frame on the flat plate, place the push rod on the V-shaped frame, fix the indicator on the flat plate, and make its probe vertically press against the upper generatrix of the positioning pin. Rotate the push rod. The maximum reading difference of the indicator during one rotation of the push rod is used as the test rod. 5.6.1.2.3 Insert a test rod into the rolling guide hole. Fix the indicator on the flat plate and place its probe vertically on the upper busbar of the test rod. Rotate the test rod for at least five turns and find the maximum difference in the indicator readings; then move the indicator to the side busbar 90 degrees apart and perform the same test.
The largest difference between the two inspection readings is taken as the measured value
JB/T3044-1
Inspection items
Parallelism of the axis of the guide hole
(or sample
hole) to the
clamping base surface
(or perpendicular
Note: Only the two
guides
used for assembly inspection
Inspection accuracy
Ordinary
Precision
Inspection tools
Indicator
Inspection rod
Indicator Instrument
Test rod
Vertical instrument
Test method
Refer to the relevant provisions of GB/T17421.1-1998
5.4.1.2.4
a Parallelism
Insert a test rod into the guide hole.
Place the indicator on the flat plate and place its probe vertically against the upper busbar of the test rod, and record the reading. Then move the indicator to another point on the upper busbar and record the reading.
The ratio of the reading difference before and after the indicator moves to the distance between the two
measurement points is the measured value
5.5.1.2.4.1
b .Verticality
Insert a test rod into the guide hole.
Place the vertical meter on a flat plate, make the indicator probe vertically press against the busbar of the test rod, and record the reading. Then move the indicator to another point on the busbar and record the reading.
The ratio of the reading difference before and after the indicator moves to the distance between the two
measuring points is the measured value.
To be tested on busbars 90° apart
JB/T3044-1
Test items
Distance from the axis
of the guide hole to the upper plane of the support plate
Note: Only two
guide holes need to be tested
tt||The distance between the guide hole axis and the locating pin axis
Note: Only two guide holes need to be checked
Moveable template
Location pad clamp
Specific base surface
Coplanarity
Accuracy grade
Ordinary grade Precision grade
Accuracy grade
Ordinary grade Precision grade
Accuracy grade
Ordinary grade Precision grade
Inspection tool
Inspection stick
Inspection stick
Indicator
Inspection method
Refer to GB/T17421.1—1998
Relevant provisions
Insert a test rod into the guide hole. Place a gauge block on the support plate, and make the distance from the upper plane of the gauge block to the fixture positioning base equal to the distance from the busbar on the test rod to the fixture positioning base. The total thickness of the gauge block minus the radius of the test rod is the measured value
Insert a test rod into the guide hole and the positioning pin push rod hole, and use the gauge block to measure the distance between the two test rods. The total thickness of the gauge block plus the radius of the two test rods is the measured value
5.4.3.2.1
Place the indicator on the flat plate, and make its probe vertically press against the upper plane of the positioning pad. Then measure all positioning pads separately.
Measurement is based on the maximum reading difference of the indicator
JB/T3044-
Mechanical industry standard
Modular machine tool
Fixture accuracy inspection
JB/T3044—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)*
2Number of words 12000
Format 880×1230
Sheet 1/2
First edition in August 1999
First printing in August 1999
Number of prints 1—500
Price 500 yuan
66600
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