JB/T 3756-1999 This standard is a revision of JB 3756-84 "Precision of Light Cylindrical Vertical Drilling Machines". During the revision, only editorial changes were made according to relevant regulations, and the technical content has not changed. The standards supporting this standard are: GB/T 2814-1989 Vertical Drilling Machine Parameters GB/T 2815-1989 Drilling Machine Spindle End This standard specifies the requirements and inspection methods for geometric accuracy inspection and working accuracy inspection of light cylindrical vertical drilling machines. This standard is applicable to light cylindrical vertical drilling machines for general purposes. This standard was first issued in April 1984. JB/T 3756-1999 Precision Inspection of Light Cylindrical Vertical Drilling Machines JB/T3756-1999 Standard Download Decompression Password: www.bzxz.net

ICS25.080.40
Machinery Industry Standard of the People's Republic of China
JB/T3756—1999
Light cylindrical vertical drilling machine
Precision inspection
Published on 1999-05-20
State Bureau of Machinery Industry
Implementation on 2000-01-01
JB/T3756—1999
This standard is a revision of JB375684 "Precision of light cylindrical vertical drilling machine". During the revision, only editorial modifications were made in accordance with relevant regulations, and the technical content remained unchanged.
Standards supporting this standard include:
GB/T2814—1989
Vertical drilling machine parameters
GB/T2815—1989
Drilling machine spindle end
Appendix A of this standard is the appendix of the standard.
This standard replaces JB375684 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 Boring and Drilling Machine Branch of the National Technical Committee for Standardization of Metal Cutting Machine Tools. The responsible drafting unit of this standard is Shanghai No. 5 Machine Tool Factory. This standard was first issued in April 1984.
1 Scope
Machinery Industry Standard of the People's Republic of China
Light cylindrical vertical drilling machine
Accuracy inspection
JB/T3756—1999
Replaces JB375684
This standard specifies the requirements and inspection methods for geometric accuracy inspection and working accuracy inspection of light cylindrical vertical drilling machines. This standard is applicable to light cylindrical vertical drilling machines for general purposes. 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/T17421.11998 General Rules for Machine Tool Inspection Part 1: Geometrical 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. In particular, the installation before accuracy inspection, the idling temperature rise of the spindle and other components, the inspection method and the accuracy of the inspection tools. 3.2 The order of accuracy inspection items listed in this standard does not represent the actual inspection order. In order to facilitate the installation and disassembly of the inspection tools and inspection, the inspection can be carried out in any order.
3.3 When the actual measured length is different from the length specified in this standard, the tolerance should be converted according to the length that can be measured according to the provisions of 2.3.11 of GB/T17421.1-1998. When the conversion result is less than 0.01mm, it is still calculated as 0.01mm. 3.4 The transverse plane referred to in this standard refers to the plane passing through the spindle axis and the column axis; the longitudinal plane refers to the plane passing through the spindle axis and perpendicular to the transverse plane.
3.5 For light cylindrical vertical drilling machines with movable spindle boxes, except for item G8, when inspecting other items, the spindle box should be located directly in front of the middle position of the stroke and locked.
3.6 According to the agreement between the user and the manufacturer, the inspection items can be increased or decreased. Approved by the State Bureau of Machinery Industry on May 20, 1999, and implemented on January 1, 2000
4 Pre-adjustment inspection
Inspection items
Machine tool leveling:
a. In the transverse plane;
b. In the longitudinal plane
0.04/1000
Inspection tools
Precision level
Inspection method
Refer to the relevant provisions of GB/T17421.11998 3.1.1
Place the bracket seat in the front position of the middle of the stroke, and lock the bracket seat and the workbench.
Place a straight ruler on the working surface of the base, and place a level on it: a. In the horizontal plane; b. In the longitudinal plane. In both the horizontal and longitudinal planes, the reading of the level should not exceed the specified value.
Note: When the base has no working surface, level it on the work surface. JB/T3756-
5 Geometric accuracy inspection
Inspection items
The plane of the working surface of the base
It is
(flat or concave) on any 300
measuring length
Inspection tools
Indicator
Inspection method
Refer to the relevant provisions of GB/T17421.1-1998 5.3.2.2
Place equal height blocks on the three reference points a, b, and c of the working surface of the base respectively. Place the ruler on the equal height blocks a-c, place an adjustable block at point e, and adjust it to make it contact with the ruler inspection surface. Then place the ruler on the be block, place an adjustable block at point d, and adjust it to make it contact with the ruler inspection surface. Place the straightedge in the direction shown in the figure, and use the indicator to measure the distance between the working surface of the base and the inspection surface of the straightedge. The error is measured by the maximum difference of the indicator readings over any 300mm measuring length. JB/T3756- Inspection Items Flatness of worktable surface (flat or concave) over any 300 measuring length Inspection Tools Indicator Inspection Method Refer to the relevant provisions of GB/T17421.1-1998 5.3.2.2 Place equal height gauge blocks on the three reference points a, b, and c of the worktable, place the straightedge on equal height gauge blocks ac, and place an adjustable gauge block at point e. Adjust it so that it contacts the inspection surface of the straightedge. Then place the ruler on the be gauge block, and place an adjustable gauge block at point d. Adjust it so that it contacts the ruler inspection surface. Place the ruler in the direction shown in the figure, and use the indicator to measure the distance between the work surface and the ruler inspection surface.
The error is measured by the maximum difference of the indicator readings over any 300mm measuring length
JB/T3756-
Inspection items
End face runout of the workbench
Radial runout of the axis of the spindle taper hole:
a. Close to the spindle end face;
b. L from the spindle end face
Inspection tools
Indicator
Indicator
Inspection rod
Inspection method
Refer to the relevant provisions 5.6.3.2 and 5.6.3.3 of GB/T17421.1-1998
Place the bracket seat in the front position of the middle of the stroke and lock it.
Place the ruler directly on the workbench according to the position shown in the figure. Fix the indicator so that its probe touches point A of the inspection surface of the flat ruler, lock the workbench, and record the reading. Loosen the workbench, rotate 180° and lock it, and record the reading at point B. Rotate the flat ruler 90° and inspect again in the same way. The error is measured by the maximum difference in the indicator readings. 5.6.1.2.3
The spindle retracts to its original position.
Insert the inspection rod into the spindle taper hole. Fix the indicator so that its probe touches the surface of the inspection rod: a. Close to the spindle end face; b. L away from the spindle end face, rotate the spindle for inspection.
Withdraw the inspection rod, rotate 90P, reinsert it into the main taper hole, and repeat the inspection three times in sequence.
A and b errors are calculated separately. The error is measured as the arithmetic mean of the four indicator readings.
Inspection is required in both the transverse and longitudinal planes of the machine tool
JB/T3756-
1 The distance between the two contacts of the indicator probe
Inspection items
Verticality of the spindle rotation axis to the work
table surface:
a. In the transverse plane;
b. In the longitudinal plane
Verticality of the spindle rotation axis to the base
seat working surface:
a. In the transverse plane:
b. In the longitudinal plane
0.10/3001)
a≤90 P）
0.06/300l）
0.08/3001)
（a≤90P）
0.06/300)
Inspection tool
Indicator
Angle gauge
Indicator
Angle gauge
Inspection method
Refer to the relevant provisions of GB/T17421.1-1998 5.5.1.21 and 5.5.1.2.4.2
The spindle retracts to the original position, the bracket seat is located in the upper front position of the stroke, and the bracket seat and the workbench are locked. Place the ruler on the workbench: a. In the horizontal plane; b.In the longitudinal plane. The indicator is mounted on the angled rod inserted into the taper hole of the spindle so that its probe touches the inspection surface of the flat ruler. Rotate the spindle 180P for inspection. Place the bracket seat in the middle and lower positions of its stroke and perform the same inspection again.
A and b errors are calculated separately. The error is measured by the difference in the readings of the indicator
5.5.1.21 and 5.5.1.2.4.2
The spindle is retracted to its original position, and the bracket seat is located directly behind the middle of the stroke and locked.
Place the flat ruler on the base surface: a. In the transverse plane; b. In the longitudinal plane. The indicator is mounted on the angled rod inserted into the taper hole of the spindle so that its probe touches the inspection surface of the flat ruler. Rotate the spindle 180° for inspection. A and b errors are calculated separately. The error is measured by the difference in the indicator readings.
JB/T3756-
Inspection items
Vertical movement of the spindle sleeve
Perpendicularity to the work table
a. In the transverse plane:
b. In the longitudinal plane
Verticality of the spindle box vertical movement to the
work table
(Only applicable to machine tools whose spindle boxes have directional lifting and shifting guide rails
) ：
a. In the transverse plane:
b. In the longitudinal plane
(a≤90)
(a≤90)
Inspection tool
Indicator
Indicator
Inspection method
Refer to the relevant provisions of GB/T17421.1-1998 5.5.2.2.2
Place the bracket seat in the front position in the middle of the stroke, and lock the bracket seat and the workbench.
Put the flat ruler on the workbench and put the angle ruler on it: a. In the transverse plane; b. In the longitudinal plane. The indicator is fixed on the spindle so that its probe touches the inspection surface of the angle ruler. Move the spindle sleeve and check the ab error in the full stroke and calculate them separately. The error is measured by the maximum difference of the indicator
5.5.2.2.2
Place the bracket seat in the front position of the middle of the stroke, and lock the bracket seat and the workbench.
Put the straight ruler on the workbench, and put the angle ruler on it. a. In the horizontal plane; b. In the longitudinal plane. Fix the indicator on the spindle so that its probe touches the inspection surface of the angle ruler. Move the spindle box over the full stroke and lock it for inspection.
Calculate the errors a and b separately. The error is measured by the maximum difference of the indicator readings.
JB/T3756-
6 Working accuracy inspection
A--Special inspection fixture directly installed on the end of the spindle: B--Base plate for placing the dynamometer (should have sufficient rigidity and area to avoid deformation of the workbench):
M--Dynamometer (should have a calibration sheet):
-Axial load applied directly to the end of the spindle (load value see Appendix A)
Inspection items
Spindle on the axis Under the action of the force
, the change of the verticality of the spindle axis to the work
table surface:
a. In the transverse plane:
b. In the longitudinal plane
2/1000
Inspection tool
Indicator
Dynamometer
Special inspection fixture
Inspection method
Refer to the relevant provisions of GB/T17421.1-1998 4.3
The spindle retracts to the original position. The bracket seat is located in the front position of the middle of the stroke, and the bracket seat and the worktable are locked.
Install the special inspection fixture A on the end of the spindle. Place the base plate B on the worktable, and place the dynamometer M and two indicators on it. Make the indicator probe touch the special inspection fixture: a. In the transverse plane; b. In the longitudinal plane. Apply an axial force F to the spindle end through a dynamometer, and perform inspection, calculate the errors of a and b respectively. The error is calculated as the algebraic difference between the readings of the two indicators. Note: Before each inspection, the workbench should be moved. JB/T3756-
JB/T3756-1999
Appendix A
(Appendix of the standard)
Corresponding relationship between F value and drilling diameter
1 In order to make each manufacturer select a unified F value, the corresponding relationship between the force F applied to the light cylindrical vertical drilling machine and the maximum drilling diameter of the machine tool is shown in Table Al.
Maximum drilling diameter of machine tool
Applied force F
32 (35)
Republic
Mechanical industry standard
Light cylindrical vertical drilling machine
Precision inspection
JB/T3756—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 880×12301/16 Printing sheet 3/4 Number of characters 20.000 First edition in July 1999
First printing in July 1999
Print run 1-500
Price 1000 yuan
99-343
6669 /In the longitudinal plane. Apply an axial force F to the spindle end through a dynamometer, and perform inspection, a, b errors are calculated respectively. The error is calculated as the algebraic difference between the readings of the two indicators. Note: Before each inspection, the workbench should be moved. JB/T3756-
JB/T3756-1999
Appendix A
(Standard Appendix)
Corresponding relationship between F value and drilling diameter
1 In order to make each manufacturer select a unified F value, the corresponding relationship between the force F applied to the light cylindrical vertical drilling machine and the maximum drilling diameter of the machine tool is shown in Table Al.
Maximum drilling diameter of machine tool
Applied force F
32 (35)
Republic
Mechanical industry standard
Light cylindrical vertical drilling machine
Precision inspection
JB/T3756—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 880×12301/16 Printing sheet 3/4 Number of characters 20.000 First edition in July 1999
First printing in July 1999
Print run 1-500
Price 1000 yuan
99-343
6669 /In the longitudinal plane. Apply an axial force F to the spindle end through a dynamometer, and perform inspection, a, b errors are calculated respectively. The error is calculated as the algebraic difference between the readings of the two indicators. Note: Before each inspection, the workbench should be moved. JB/T3756-
JB/T3756-1999
Appendix A
(Standard Appendix)
Corresponding relationship between F value and drilling diameter
1 In order to make each manufacturer select a unified F value, the corresponding relationship between the force F applied to the light cylindrical vertical drilling machine and the maximum drilling diameter of the machine tool is shown in Table Al.
Maximum drilling diameter of machine tool
Applied force F
32 (35)
RepublicwwW.bzxz.Net
Mechanical industry standard
Light cylindrical vertical drilling machine
Precision inspection
JB/T3756—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 880×12301/16 Printing sheet 3/4 Number of characters 20.000 First edition in July 1999
First printing in July 1999
Print run 1-500
Price 1000 yuan
99-343
6669 /
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