JB/T 2617.2-1999 This standard is a revision of ZB J55 035-88 "Precision of crankshaft grinders". This standard is part of the JB/T 2617 "Crankshaft grinders" series of standards: JB/T 2617.1-1999 Crankshaft grinder parameters JB/T 2617.2-1999 Crankshaft grinder precision inspection JB/T 2617.3-1999 Crankshaft grinder technical conditions This standard specifies the requirements and inspection methods for the geometric accuracy inspection and working accuracy inspection of crankshaft grinders. This standard is applicable to crankshaft grinders with a maximum swing diameter of 250~800mm, a maximum workpiece length of 500~4000mm, and a movable worktable. This standard was first issued in 1979 as JB 2618-79 and first revised in 1988. JB/T 2617.2-1999 Crankshaft Grinding Machine Accuracy Test JB/T2617.2-1999 Standard Download Decompression Password: www.bzxz.net

ICS25.080.50
Machinery Industry Standard of the People's Republic of China
JB/T2617.2—1999
Crankshaft grinder
Published on 1999-05-20
Precision Inspection
Implementation on 2000-01-01
State Bureau of Machinery Industry
JB/T2617.2—1999
This standard is revised on the basis of ZBJ55035—88 "Precision of Crankshaft Grinder". The technical content of this standard is consistent with ZBJ55035-88, and it has only been re-edited according to relevant regulations. This standard is part of the JB/T2617 series of standards for crankshaft grinders, which includes the following three parts: JB/T2617.1—1999
JB/T2617.2—1999
Crankshaft grinder parameters
Crankshaft grinder accuracy inspection
JB/T2617.3—1999
Crankshaft grinder technical conditions
This standard replaces ZBJ55035—88 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 Grinding Branch of the National Technical Committee for Standardization of Metal Cutting Machine Tools. The responsible drafting unit of this standard: Shanghai Machine Tool Factory This standard was first issued as JB2618 in 1979 and revised for the first time in 1988. 1
1 Scope
Machinery Industry Standard of the People's Republic of China
Precision Inspection of Crankshaft Grinders
JB/T2617.2—1999
Replaces ZBJ55035—88
This standard specifies the requirements and inspection methods for the geometric accuracy inspection and working accuracy inspection of crankshaft grinders. This standard is applicable to ordinary precision crankshaft grinders with a maximum rotary diameter of 250~800mm, a maximum workpiece length of 5004000mm, and a movable worktable.
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/T11821996
General rules, definitions, symbols and drawing representations of shape and position tolerances GB/T17421.1—1998
3 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. In particular, the installation before inspection, the idling temperature rise of the spindle and other components, the inspection method and the accuracy of the inspection tools. 3.2 Adjust the installation level in accordance with the provisions of 3.1 of GB/T17421.1-1998, and the readings of the level in the longitudinal and transverse directions shall not exceed 0.04/1000.
3.3 Before inspection, the actual inspection order can generally be arranged according to the requirements of the installation and disassembly tools, inspection convenience, and thermal inspection items. 3.4 When the measured length is different from the length specified in this standard, the tolerance shall be converted according to the measurable length in accordance with the provisions of 2.3.1.1 of GB/T17421.11998. When the conversion is less than 0.001mm, it shall still be calculated as 0.001mm. 3.5 When inspecting the working accuracy, the test piece shall be inspected after fine grinding. 3.6 According to the agreement between the user and the manufacturer, the inspection items can be increased or decreased. 3.7 If static pressure bearings or dynamic pressure bearings are used, the pressure oil pump must be started during the inspection. Approved by the State Bureau of Machinery Industry on May 20, 1999 and implemented on January 1, 2000
4 Pre-adjustment inspection
Inspection items
Longitudinal direction of the bed
Straightness of the guide rail
a. In the vertical
plane;
b. In the horizontal
plane
Longitudinal direction of the bed
Straightness of the guide rail in the vertical
plane
Within 1000 length, the tolerance value
The maximum tolerance value is
For every increase of 1000, the tolerance value is
|tt||Local tolerance:
Measure the length at any 250
0.04/1000
Inspection tools
Autocollimator
Special gauge
Level
Special gauge
Inspection method
Refer to the relevant provisions of GB/T17421.1-1998
5.21.2.2.2
a Place the reflector of the autocollimator on the special gauge of the longitudinal guide rail of the bed, and place the light tube outside the bed. Move the gauge, record the reading every gauge length, and draw the error curve of the guide rail. The full-length error is calculated by the maximum algebraic difference between the coordinate values ​​of the error curve and the connecting line of its two end points.
Local error is calculated by the maximum value of the coordinate difference between the connecting line of the two end points of the relative error curve of two adjacent points.
b. Rotate the eyepiece of the autocollimator light tube 90 degrees and perform the same inspection again
5.4.1.2.7
Place a level gauge perpendicular to the moving direction of the gauge gauge on the special gauge of the longitudinal guide rail of the bed. Mobile gauge inspection.
The error is calculated by the maximum algebraic difference of the level gauge readings JB/T2617.2-
5 Geometric accuracy inspection
Inspection items
Parallelism of the headstock and tailstock moving guide rails to the movement of the worktable
Axial movement of the headstock spindle
Within 1000 length, the tolerance is
For every increase of 1000, the tolerance increases
The maximum tolerance is
Local tolerance
Maximum rotation diameter
≤400
Measuring length
Inspection tool
Indicator
Indicator
Special inspection fixture
Inspection method
Refer to the relevant provisions of GB/T17421.1-1998
5.4.2.2.2.1
Fix the indicator so that its probe touches the surface of the head and tailstock displacement guide rails, and move the workbench to inspect in sequence.
The error is measured by the maximum difference between the indicator readings at any local length and the full length
5.6.2.2.2
A special inspection fixture is placed on the spindle. Fix the indicator so that its probe touches the surface of the steel ball in the center hole of the special inspection fixture, and rotate the spindle for inspection.
The error is measured by the maximum difference between the indicator readings. During the inspection, an axial force F specified by the manufacturer should be added through the spindle axis (no force is required for the spindle whose axial clearance has been eliminated)
JB/T2617.2-
Inspection items
The runout of the headstock faceplate
The radial runout of the taper hole axis of the headstock spindle:
a. Close to the spindle end:
b. From the spindle end 300mm on the part
On the 400 diameter
Maximum workpiece rotation diameter
≤400
Inspection tool
Indicator
Indicator
Inspection rod
Inspection method
Refer to the relevant provisions of GB/T17421.1-1998
|Fix the indicator so that its probe touches the surface of the faceplate near the edge, and rotate the spindle for inspection.
The error is measured by the maximum difference of the indicator readings 5.6.1.2.3
Insert a test rod into the spindle taper hole. Fix the indicator so that its probe touches the surface of the test rod: a. Close to the spindle end: b. 300mm away from the spindle end. Rotate the spindle for inspection.
Pull out the inspection rod, rotate it 90 degrees relative to the spindle taper hole, reinsert the inspection rod, and inspect four times in sequence. Calculate the a and b errors separately. The error is calculated as the average of the four indicator readings
JB/T2617.2-
Inspection items
The parallelism of the headstock spindle axis relative to the worktable movement:
a. In the vertical
plane;
b. In the horizontal
plane
The axial movement of the tailstock spindle
|The maximum The rotation diameter of large workpieces is ≤400 mm and is 300 mm in measuring length (the free end of the inspection rod can only be deflected toward the grinding wheel and upwards). Inspection tools, indicator, inspection rod, indicator, special inspection tool, inspection method, refer to GB/T17421.1—1998
Relevant provisions of
5.4.1.2.1:5.4.2.2.3
Insert a test rod into the taper hole of the spindle. Fix the indicator so that its probe touches the surface of the test rod: a. in the vertical plane; b. in the horizontal plane. Move the workbench to inspect. Then, rotate the spindle 180° and inspect again.
A and b errors are calculated separately. The error is calculated as half of the algebraic sum of the two indicator readings
5.6.2.2.2
Place a special gauge on the spindle. Fix the indicator so that its probe touches the surface of the steel ball in the center hole of the special gauge. Rotate the spindle to inspect.
The error is calculated as the maximum difference between the indicator readings. During the inspection, an axial force F specified by the manufacturer should be applied through the spindle axis (no force is required for the spindle that has eliminated the axial clearance)
JB/T2617.2-
Inspection items
End runout of the tailstock faceplate
Radial runout of the taper hole axis of the tailstock spindle:
a. Close to the spindle end:
b. From the spindle end 300mm on the part
On the diameter of 400 is
Maximum workpiece rotation diameter
≤400
Inspection tool
Indicator
Indicator
Inspection rod
Inspection method
Refer to the relevant provisions of GB/T17421.1-1998
|Fix the indicator so that its probe touches the edge of the faceplate surface, and rotate the spindle for inspection.
The error is measured by the maximum difference of the indicator readings 5.6.1.2.3
Insert a test rod into the spindle taper hole. Fix the indicator so that its probe touches the surface of the test rod: a. Close to the spindle end: b. 300mm away from the spindle end. Rotate the spindle for inspection.
Pull out the inspection rod, rotate it 90 degrees relative to the spindle taper hole, reinsert the inspection rod, and inspect four times in sequence. Calculate the errors a and b separately. The error is calculated as the average of the four readings of the indicator
JB/T2617.2-
Inspection items
The parallelism of the tailstock spindle axis to the movement of the worktable:
a. In the vertical
plane;
b. In the horizontal
plane
The parallelism of the line connecting the spindle centers of the headstock and tailstock to the movement of the worktable:
a. In the vertical
plane;
b In the horizontal
plane
The maximum workpiece rotation diameter
≤400
On the 300 measuring length is
(the free end of the test rod can only
be tilted upward and toward the grinding wheel frame)
On the 300 measuring length is
Maximum workpiece rotation diameter
≤400
Testing tools
Indicator
Testing rod
Indicator
Testing rod
Testing method
Refer to the relevant provisions of GB/T17421.1—1998
5.4.1.2.1;5.4.2.2.3
Insert a test rod into the spindle taper hole. Fix the indicator so that its probe touches the surface of the test rod: a. In the vertical plane: b. In the horizontal plane. Move the workbench for inspection. Then, rotate the spindle 180° and check again.
Calculate the errors a and b separately. The error is calculated as half of the algebraic sum of the two indicator readings
5.4.3.2.1;5.4.3.2.3
Put a test rod of equal diameter on each of the headstock and tailstock spindles. Fix the indicator so that its probe touches the cylindrical surface of the test rod. Move the workbench and check at the base of the two test rods. Then, rotate the headstock and tailstock spindles 180° and check again.
Calculate the errors a and b separately. The error is calculated as half of the algebraic sum of the two measurement results.
JB/T2617.2-1
Inspection items
The runout of the end of the main shaft of the grinding wheel frame
a. The radial runout of the main shaft center cone surface;
b. The axial movement of the main shaft
Parallelism of the main shaft axis of the grinding wheel frame to the movement of the worktable:
Inspection tool
Indicator
Inspection sleeve on a measuring length of 100
(The free end of the inspection sleeve is only allowed to deflect upward) a. In the vertical plane: b. In the horizontal plane, on the 100-meter measuring length, the inspection method is as follows: 5.6.1.2.2; 5.6.2.1.2; 5.6.2.2.2; 5.6.2.2.1 Fix the indicator so that its probe touches vertically: a. The middle position of the spindle cone b. The surface of the steel ball in the spindle center hole. Turn the spindle to inspect. Calculate the errors of a and b respectively. The error is calculated as the maximum difference of the indicator readings.
During inspection, an axial force F specified by the manufacturer should be applied through the spindle axis (no force is required for spindles that have eliminated axial play)
5.4.3.2.1;5.4.2.2.3
Install an inspection sleeve on the centering cone of the grinding wheel stand spindle. Fix the indicator so that its probe touches the sleeve surface: a. In the vertical plane: b. In the horizontal plane. Move the workbench for inspection. Then, rotate the spindle 180° and inspect again.
Calculate the errors of a and b respectively. The error is calculated as half of the algebraic sum of the two indicator readings. JB/T2617.2- Inspection Items The vertical height of the grinding wheel frame main axis and the head frame main axis axis relative to the worktable movement is equal in the entire stroke. Tool
Indicator
Special inspection fixture
(bridge plate)
Indicator
Inspection sleeve
Inspection rod
Inspection method
Refer to the relevant provisions of GB/T17421.1-1998
5.5.2.2.3
Put a square on the special inspection fixture on the workbench. Adjust the square so that one side is parallel to the moving direction of the workbench. Fix the indicator on the grinding wheel frame so that its probe touches the other side of the square. Move the grinding wheel frame and inspect it on the full stroke. bZxz.net
The error is measured by the maximum difference of the indicator readings 5.4.3.2.1;5.4.3.2.2
Install a inspection sleeve on the centering cone of the grinding wheel frame spindle, and insert a inspection rod of equal diameter into the cone hole of the headstock spindle. Place an indicator on the bridge plate on the workbench, and move the indicator so that its probe touches two cylindrical surfaces for inspection. The error is measured by the difference between the two readings of the indicator. JB/T2617.2-
Inspection Items
Headstock chuck
Centerline radial runout:
a. Root of the inspection rod:
b. 10mm from the root
(For tailstock chucks with
special chucks) Centerline radial runout:
a. Root of the inspection rod:
b. 10mm from the root
For
machine tools with
special chucks)
Inspection tools
Indicator
Inspection rod
Indicator
Inspection rod
Inspection method
Refer to the relevant provisions of GB/T17421.1-1998
5.6.1.2.3
Clamp a test rod with the same eccentricity as the crankshaft grinding sample in the chuck. Fix the indicator so that its probe touches the surface of the test rod: a. At the root of the test rod; b. 100mm from the root. Turn the spindle to inspect. Calculate the errors of a and b separately. The error is calculated as the maximum difference between the indicator readings
5.6.1.2.3
Clamp a test rod with the same eccentricity as the crankshaft grinding sample in the chuck. Fix the indicator so that its probe touches the surface of the test rod: a. The root of the test rod: b. 100mm from the root. Turn the spindle to test. Calculate the errors a and b separately. The error is calculated as the maximum difference between the indicator readings
JB/T2617.2-1
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