JB/T 3041-1999 This standard is a revision of JB 3041-82 "Precision of boring and facing heads for modular machine tools". After the revision, the inspection item "perpendicularity of the moving direction of the cutter head to the axis of rotation of the spindle" in the original version remains unchanged; the inspection of other geometric accuracy and working accuracy is consistent with JB/T 3039-1992 "Precision of boring heads for modular machine tools". This standard specifies the requirements and inspection methods for the geometric accuracy and working accuracy of boring and facing heads for modular machine tools (hereinafter referred to as boring heads). This standard is applicable to boring heads of ordinary accuracy, precision and high precision grades for modular machine tools. This standard was first issued in 1982. JB/T 3041-1999 Inspection of precision of boring and facing heads for modular machine tools JB/T3041-1999 Standard download decompression password: www.bzxz.net

ICS25.060.99
Machinery Industry Standard of the People's Republic of China
JB/T3041-1999
Modular Machine Tools
Precision Inspection of Boring and Facing Heads
Published on May 20, 1999
National Bureau of Machinery Industry
Implementation on January 1, 2000
JB/T3041—1999
This standard is revised on the basis of JB304182 "Precision of Boring and Facing Heads of Modular Machine Tools". After the revision, the inspection item "the verticality of the moving direction of the cutter head slide to the axis of rotation of the spindle" in the original version remains unchanged; the inspection of other geometrical precision and working precision is consistent with JB/T3039—1992 "Precision of Boring Heads of Modular Machine Tools". This standard replaces JB3041—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 Combined Machine Tool Branch of the National Technical Committee for Standardization of Metal Cutting Machine Tools. The responsible drafting unit of this standard is Dalian Combined Machine Tool Research Institute. This standard was first issued in 1982.
1 Scope
Machinery Industry Standards of the People's Republic of China
Combined Machine Tools
Precision Inspection of Boring and Facing Heads
JB/T3041-1999
Replaces JB3041-82
This standard specifies the requirements and inspection methods for the geometric accuracy and working accuracy of boring and facing heads (hereinafter referred to as boring heads) of combined machine tools. The standard is applicable to boring heads of ordinary accuracy, precision and high precision grades of combined machine tools. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were all 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 Basic Requirements
3.1 The nominal size of the boring head is the saddle width of the corresponding slide, which is equal to the bottom width of the boring head. 3.2 When using this standard, reference should be made to the relevant provisions of GB/T17421.1. 3.3 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.
3.4 ​​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 Bureau of Machinery Industry on May 20, 1999, and implemented on January 1, 2000
4 Geometric accuracy inspection
Inspection items
Boring head bottom
Flatness of surface
Nominal size
≤125
>125~200
>200~320
>320~500
>500~800
Accuracy level
Ordinary level
No convex
Precision level
Inspection tool
Indicator
Adjustable support
Inspection method
Refer to the relevant provisions of GB/T17421.1-1998
|Support the boring head on the flat plate with three adjustable supports. Place the indicator on the flat plate so that its probe touches the inspected surface vertically. Adjust the support so that three points on the inspected surface that are far apart are at the same height as the flat plate.
Measure at several points on the inspected surface.
Take the maximum difference of the indicator reading as the measured value
JB/T3041-1
Inspection item
Radial runout of the inner center diameter of the spindle
≤200
Ordinary grade
Precision grade
Inspection tool
Indicator
Inspection rod
Inspection method Refer to the relevant provisions of
GB/T17421.1—1998
5.6.1.2.3
Insert an inspection rod into the spindle hole. Fix the indicator on the flat plate so that its probe touches the upper generatrix at a
of the inspection rod vertically. Rotate the spindle for no less than five turns and note the maximum difference in the indicator readings. Then move the indicator to the side busbar 90° apart and perform the same test. The largest maximum difference between the two tests is taken as the measured value.
Then move the indicator to b,
repeat the above inspection and find the measured value
JB/T3041-
Inspection items
Spindle rotation
Axis plane to boring and turning
bottom surface of head
≤200
Accuracy etc.
Ordinary grade
Precision grade
Inspection tools
Indicator
Inspection rodwww.bzxz.net
Inspection method
Refer to the relevant provisions of GB/T17421.1—1998
5.4.1.2.4
Insert an inspection
rod into the spindle hole. Fix the indicator on the flat plate,
so that its probe touches the upper busbar of the test stick
vertically, and record the reading; then
move the indicator to b, and record the reading
. Calculate the difference between the indicator's readings at a and b. Then rotate the spindle 180° and inspect again using the same method. Take half of the algebraic sum of the difference between the two inspection readings as the measured value. JB/T3041-1 Inspection Items Radial runout of the spindle's external centering diameter End runout of the spindle ≤200 ≤200 Accuracy, etc. Ordinary grade Precision grade Accuracy Ordinary grade Precision grade Inspection tools Indicator Indicator Inspection method Refer to the relevant provisions of GB/T17421.1-1998 5.6.1.2.2 Fix an indicator on the flat plate so that its probe touches point a on the spindle centering surface vertically. Rotate the spindle for at least five circles and record the maximum difference of the indicator reading. Then move the indicator to point b, which is 90° away, and perform the same inspection.
Use the largest
maximum difference of the two tests as the measured value
Fix an indicator on the flat plate, make
its probe vertically touch the a point on the spindle end face close to the outer circle, rotate the spindle, it should be
not less than five circles, record the maximum difference of the indicator reading
. Then move the indicator to the b point
90 away, and perform the same
test.
The largest
difference between the two tests is taken as the measured value
JB/T3041-1
Test items
Axis
Directional play of spindle
Spindle rotation
Verticality of axis to rear end face of boring head
≤200
≤200
Accuracy
Ordinary
Precision
Accuracy
Ordinary
Precision Confidentiality level
Testing tools
Indicator
Testing rod
Indicator
Testing method
Refer to the relevant provisions of GB/T17421.1-1998
5.6.2.21:5.6.2.2.2
Insert a short testing rod into the spindle hole, put a steel ball in the top hole of the testing rod, and fix the flat-head indicator on the flat plate so that its probe touches the surface of the steel ball. Rotate the spindle for no less than five turns. Take the maximum difference of the indicator reading as the measured value
5.5.1.2.1
Fix the indicator at the end of the spindle,
make the probe close to the edge of the rear end face of the boring head, and touch the rear end face vertically.
Take the maximum
reading difference between two relative points on the diameter when the spindle rotates 180P
as the measured value
JB/T3041-
Inspection items
The degree of coincidence between the
axis of spindle rotation and the
axis of the centering
stop|||The perpendicularity of the
moving direction of the cutter head slide to the
spindle rotation axis
≤200
≤800
Accuracy, etc.
Ordinary level| |tt||Precision grade
Accuracy grade
Ordinary grade
Precision grade
0.006/100
Note: When the cutter head slide moves from the edge to the center, it is not allowed to deviate to the two sides of the boring head
Inspection tool
Indicator
Inspection method
Refer to the relevant provisions of GB/T17421.1-1998
Fix the indicator at the end of the spindle,
so that the probe touches the surface of the centering stop vertically
. Rotate the spindle and record the difference between the indicator readings on the upper and side generatrix and its readings on the counter
weighing point.
Use half of the largest reading difference
as the measured value
Fix the indicator on the slide in the horizontal
position, and make its probe vertical
on the working surface of the
inspection ruler adapted to the center height of the cutter disc. Rotate the
cutter disc 180°, so that the indicator readings before and after the
turn of the cutter disc are equal.
Move the slide
within the full range of travel
for inspection.
Take the maximum difference of the indicator reading as the measured value
JB/T3041-
5 Working accuracy inspection
Test piece shape and size
≥025d
Nominal size
≤200
>200-400
80-160
80-160
≥400-800|| tt||160-250160-250
Test piece material: 45 steel
Test piece heat treatment: normalizing
On the special test
test bench, the test
piece is fixed, the boring
head machine is automatically fed
for fine boring and turning
using YT30
boring tool to perform
fine boring and turning
roundness on the rough
hole;
|b.Consistency of diameter on longitudinal section:
c.Surface roughness:
dVerticality of turning end face to boring hole axis
≤200
≤800
≤800
Accuracy grade
Ordinary grade
Precision grade
R.≤3.2μm||t t||0.032/100
R≤1.6μm
0.020/100
Test bench
Roundness instrument
Indicator
Three-coordinate
Refer to the relevant provisions of GB/T17421.1-1998
a Roundness
Method 1: Measure with roundness instrument:
Method 2: Measure with indicator.
b. Diameter consistency on longitudinal section
Consistency of diameter on longitudinal section is the difference between the maximum
measuring machine
and the minimum diameter on the same longitudinal section.
Method 1: Measure with three-coordinate measuring
contour meter machine;
Method 2: Measure with indicator
c. Surface roughness
Measure with profilometer.
d End face perpendicular to the hole axis
Measured with an indicator
Mechanical industry standard
Combined machine tools
Precision inspection of boring and facing heads
JB/T3041—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)*
Format 880X12301/16 Printing sheet 3/4 Number of words 18000 First edition in July 1999
First printing in July 1999
Print count 1-500
Price 1000 yuan
99-301The consistency of the diameter on the longitudinal section is the difference between the maximum and minimum diameters on the same longitudinal section. Method 1: Measure with a three-coordinate measuring machine profilometer; Method 2: Measure with an indicator c. Surface roughness is measured with a profilometer.
d End face perpendicular to the hole axis
Measured with an indicator
Mechanical industry standard
Combined machine tools
Precision inspection of boring and facing heads
JB/T3041—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)*
Format 880X12301/16 Printing sheet 3/4 Number of words 18000 First edition in July 1999
First printing in July 1999
Print count 1-500
Price 1000 yuan
99-301The consistency of the diameter on the longitudinal section is the difference between the maximum and minimum diameters on the same longitudinal section. Method 1: Measure with a three-coordinate measuring machine profilometer; Method 2: Measure with an indicator c. Surface roughness is measured with a profilometer.
d End face perpendicular to the hole axis
Measured with an indicator
Mechanical industry standard
Combined machine tools
Precision inspection of boring and facing heads
JB/T3041—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)*
Format 880X12301/16 Printing sheet 3/4 Number of words 18000 First edition in July 1999
First printing in July 1999
Print count 1-500
Price 1000 yuan
99-301
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