JB/T 9876-1999 Inspection and evaluation of the color coating method for the joint surfaces of metal cutting machine tools
Some standard content:
JB/T 9876—1999
This standard is a revision of 7B3J5001089 "Inspection and evaluation of color coating method for mating surfaces of metal cutting machine tools". The original version was formulated based on many years of production experience of machine tool products in my country and taking into account the requirements of users. Its technical content still meets the current level of science and technology and adapts to production and use needs.
This standard is consistent with the technical content of ZBJ5001089. It has been re-edited in accordance with relevant regulations. This standard will replace ZBJ50010-89 from the month of implementation. Appendix Λ and Appendix B of this standard are both informative appendices. This standard was proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of the National Technical Committee for Standardization of Metal Cutting Machine Tools. The drafting units of this standard are: Beijing Machine Tool Research Institute, Qiqihar No. 1 Machine Tool Factory, Shanghai No. 2 Machine Tool Factory, Beijing No. 1 Machine Tool Factory, and Hanjiang Machine Tool Factory.
This standard was first issued in 1978 and revised for the first time in 1988. 520
1 Scope
Machinery Industry Standards of the People's Republic of China
Metal Cutting Machine Tools
Inspection and Evaluation of Joint Surface Color Coating Method
JB/T 9876--1999
Replaces ZBJ5001G:89
This standard specifies the coloring inspection and evaluation method for the contact quality of guide pairs, sliding bearings and particularly important fixed joint surfaces of metal cutting machine tools
This standard is applicable to metal cutting machine tools and their accessories. Casting equipment, forging machinery, and woodworking machine tools can refer to it. 2 Reference 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. All parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 253 -1989
GB/T 443--- 1989
Kerosene for lamps
Machine oil
GB/T 1705
JB/T 9871---1999
JB/T 9872 1999
JB/T 9874.1999
General requirements
Metal cutting machine tools
Metal cutting machine tools
Metal cutting machine tools
Accuracy classification
Mechanical processing.1. General technical conditions for parts
General technical conditions for assembly
3.1 The inspection of the contact quality of two joint surfaces during assembly should generally be carried out by direct joint inspection of the two joint surfaces. When direct joint inspection is difficult due to structural reasons, it is allowed to use a gauge to inspect the two joint surfaces separately. If both joint surfaces are planes, the same gauge should be used for inspection; for dovetail, rectangular, V-shaped, etc., which are composed of two or two work surfaces, or for particularly important fixed joint surfaces, a set of gauges should be used for inspection.
3.2 The inspection of the contact quality of the joint surfaces during processing should be carried out by joint inspection of the gauge. 3.3 When using a gauge for joint inspection, the length of the gauge should generally not be less than the matching length of the replaced part. The accuracy and technical requirements of the gauge should comply with relevant regulations.
3.4 When two joint surfaces are directly tested by grinding, the accuracy and technical requirements of one of the surfaces shall comply with relevant regulations, and the surface shall be used as the reference surface and the other surface as the matching surface. For guide rail pairs, the guide rail surface on the base part should generally be selected as the reference surface. For two joint surfaces, one of which is a mechanically added surface and the other is a scraped surface, the machined surface should be selected as the reference surface. 3.5 The medium used in the grinding is red lead coating, and its ratio (by weight) is recommended as follows: red lead: machine oil: kerosene ~ 100:7:3 kerosene should meet the quality indicators specified in GB/T253. The machine oil shall meet the quality index of HJ-20 specified in (G13/T443. Red lead shall meet the quality index of Grade 1 or Grade 2 specified in GB/T1705. Note: (\I-1 coating or other coatings may be used instead of red lead coating. When there is a dispute over the evaluation conclusion, red lead coating shall be used as the arbitration coating. 4 Inspection method
4.1 Coating
Approved by the State Machinery Industry Bureau on May 20, 1999 and implemented on January 1, 20000
JB/T9876—1999
4.1.1 When two joint surfaces are directly ground together for inspection, if both joint surfaces are machined surfaces or scraped surfaces, the coating can be applied on the reference surface or the matching surface; if one of the two joint surfaces is a scraped surface, the coating should be applied on the scraped surface 4.1.2 When using a gauge to inspect machined surfaces, the paint should generally be applied to the gauge 1. When using a gauge to inspect scraped surfaces, the paint should be applied to the scraped surfaces.
4.1.3 The paint should be applied evenly, and the coating thickness should not exceed 5μm. For a simple method for measuring coating thickness, see Appendix 13 (suggestive appendix). 4.2 Grinding
4.2.1 Grinding stroke
4.2.1.1 Stroke when the guide pair is ground: When the linear motion guide pair is ground, the matching surfaces should be ground within the working range of the reference surface. The stroke distance should not be greater than 1/2 of the matching length; when the circular guide pair is ground, the matching surfaces should be ground at two positions 180° apart: respectively with the reference surface, and the rotation range should not be greater than 90°. When the sector guide pair is ground, the matching surfaces should When grinding within the working range of the reference surface, the rotation range shall not exceed 1/2 of the matching arc length.
4.2.1.2 Particularly important travel when grinding fixed joint surfaces: When grinding rectangular joint surfaces, the matching surfaces shall be grinded in one direction of the width or length of the reference surface (no limit to the direction when grinding with a gauge), and the width or length of the matching surface beyond the reference surface shall not exceed 1/5 of the width or length of the joint; when grinding circular joint surfaces, the matching surfaces shall be grinded with the reference surface at two positions 180° apart, and the rotation range shall not exceed 90°; when grinding fan-shaped joint surfaces, the angle of the matching surface beyond the reference surface shall not exceed 1"5 of the matching arc length. 4.2.2 Number of grinding strokes
The number of strokes for each grinding shall not exceed five double strokes. 4.2.3 Load
When the weight of the matching parts or the gauge is light during the joint grinding process, it is allowed to apply the load evenly. 5 Evaluation method
5.1 Evaluation method of machined surface contact
5.1.1 Evaluation basis
5.1.1.1 When the paint is applied on the matching surface, the bright spots, black spots and dark red spots on the matching surface after the joint grinding are all the basis for evaluating the contact. 5.1.1.2 When the paint is applied on the reference surface or the gauge, the bright spots, black spots, dark red spots and the original color of the paint on the matching surface after the joint grinding are all the basis for evaluating the contact
5.1.2 Calculation and evaluation of contact length (width) 5.1.2.1 When calculating the contact length, only when the contact in width reaches the specified index can it be used as the calculated value in length. 5.1.2.2 The evaluation index of contact length (width) shall meet the following requirements: a) When the coating is applied on the matching surface and the contact is directly tested by grinding, the contact length (width) on the matching surface shall meet the requirements specified in JB/T9874; b) When the coating is applied on the reference surface and the contact is directly tested by grinding, the contact length on the matching surface shall be increased by 5% based on the indicators specified in the above standards (for example: the standard stipulates that the contact length is 70%, and after increasing by 5%, it is 75%); c) When the inspection tool is used to grind and test the contact during the assembly process, the contact width of the narrow side of the matching surface shall be increased by 15% based on the indicators specified in the above standards (for example: the standard stipulates that the contact width is 45%, and after increasing by 15%, it is 60%); d) When the inspection tool is used to grind and test the contact during the processing, the contact length (width) of the matching surface shall meet the requirements specified in JB/T9872. 5.1.2.3 The complex shape joint surface shall be evaluated as follows: a) The disconnection plane shall be evaluated separately. As shown in Figure 1, it should be evaluated according to three planes; Figure 1
JB/T 9876-1999
b) The continuous plane with holes should be divided into zones for evaluation. As shown in Figures 2 and 3, it should be divided into four and five zones for evaluation respectively: Dead corner
Note: Dead corners are allowed to be non-contacting.
) The circular ring plane should be evaluated as unfolded.
5.1.3 Evaluation of contact uniformity
The contact uniformity of the mating surface is evaluated according to the size of the empty area. The inscribed rectangular area on the mating surface that is not in contact is called the narrow gate area. The width and length of the empty area shall not be greater than or equal to the indicators specified in Table 1 at the same time; at the same time, the blank area of Class I or Class 1 that is greater than or equal to the indicators specified in Table 2 is allowed to appear at one place, but it shall not appear at both ends (Class A) or both sides (Class B). Table 1
Machine tool accuracy grade
(according to J13/T9871)
Grade II and above Grade III
Machine tool accuracy grade
(according to JB/T 9871)
Grade W and above Grade IV
Sliding guide and sliding bearing
Over the entire length
Type of blank area
Full width!
Transfer guide rail
Over the entire length
Sliding guide rail sliding bearing
Over the entire length
Over the entire width
Over the entire width
Transfer guide rail
Over the entire length
Over the entire width
Especially important surrounding joint surface
Over the entire length
Individual information 1
Especially important fixed joint surface
Over the length
Over the official research
JB/T9876—1999
5.1.4 For an example of the evaluation method of the mechanical T-joint surface, see Appendix A (suggestive appendix). 5.2 Evaluation method of scraped surface contact
5.2.1 Evaluation basis
The bright spots and dark black spots on the scraped surface after joint grinding are the basis for evaluating the contact. 5.2.2 Calculation and evaluation of the number of contact points
5.2.2.1 The number of contact points within each 25mm×25mm area of the scraped surface to be evaluated shall be the number of contact points. The number of contact points should be calculated according to the provisions of 3. Table 3
Machine tool accuracy grade
(according to JB/T9871)
W grade and grade
Machine tool weight
5.2.2.2 The scraping points should be evenly distributed, and the number of contact points should comply with the provisions of JB/T9872 and JB/T9874. Note: The contact points without obvious disconnection marks are calculated by point. 524
Calculation area
J B/T98761999
Appendix A
(Appendix to the proposal)wwW.bzxz.Net
Example of the evaluation method for the joint surface of machined parts This example takes the contact of the sliding guide surface of a machine tool with a precision level of √ as an example to illustrate its evaluation method and procedure. First, evaluate whether the contact length (width) of the guide surface meets the specified indicators of JB/T9874. As shown in Figure A!, find the place where the contact on the width reaches (greater than or equal to) .50. Calculate its contact length! ..t +-
0.201+0.271.
.0.471.
1 . 0. 70 1.
This indicates that the contact of this surface does not meet the standard requirements and should be evaluated as unqualified. It is not necessary to continue to evaluate the blank area. .0.20
rg'nas
Ip= 0. 27 1.
09-029
As shown in Figure A2, find the place where the contact on the width reaches 6 or equal to 0.5013, and calculate its contact length 11=
This indicates that the contact index of this surface is qualified, and the blank area can be continued to be evaluated according to the provisions of Table 1 of this standard. Figure A2
JB/T 9876-1999
According to 5.1.3 of this standard, the width and length of the blank area shall not be greater than or equal to the indicators specified in Table 1 at the same time. A2
As shown in Figure A3, find the place where the width of the blank area is greater than or equal to 0.50B, and calculate the length of the blank area 71=1---(+t)
1.—(0.33L +0.381)
10,25L
This means that the width and length of this blank area exceed the indicators specified in Table 1 at the same time, and the contact uniformity is not good. This surface should still be evaluated as unqualified and no further evaluation is required.
= 0. 33 2
As shown in Figure A4, the width of the blank area is less than 0.50B and the length is greater than or equal to 0.251, which does not exceed the indicators specified in Table 1 at the same time. It should continue to be evaluated according to the blank area specified in Table 2 of this standard. Og
A3 5.1.3 of this standard also stipulates: When the blank area is greater than or equal to the index specified in Table 2, it is only allowed to appear at one place, and it shall not appear at both ends or both sides. As shown in Figure A5, the blank area is greater than or equal to 0.20B in width and 1 greater than or equal to 0.50L in length. Although it only appears at one place, but appears on one side, it should still be evaluated as unqualified. 526
JB/T9876—1999
1≥0.50/
As shown in Figure A6, although the blank area appears on the side, its width is less than 0.20B and its length is equal to (.301, which does not exceed the specified values in Table 2 at the same time, it should be evaluated as a qualified product. Finally, this surface can be evaluated as a qualified product. 2
JB/T 9876-1999
Appendix B
(Prompt Attachment)
Simple Measurement Method of Coating Thickness
Make a special cylindrical gauge (Figure B1) or rectangular gauge (Figure B2), the groove depth is 5um, and the protruding parts at both ends are used as support surfaces. When measuring, according to the groove and the width of the support surfaces at both ends, wipe the red lead coating in contact with the support surface with gasoline, and then put the gauge close to the surface of the measured part. Slowly roll or move the gauge, and the rolling or moving force is perpendicular to the coating direction. If the surface of the gauge groove is not stained with red, the measured red lead coating thickness is less than 5um. When starting to use this inspection method, in order to compare the coating thickness, you can make several sizes of gauges to facilitate mastering in production practice.25L
indicates that the width and length of this empty area exceed the indicators specified in Table 1 at the same time, and the contact uniformity is not good. This surface should still be evaluated as unqualified and no further evaluation is required.
= 0.33 2
As shown in Figure A4, the width of the pull area is less than 0.50B and the length is greater than or equal to 0.251, which does not exceed the indicators specified in Table 1 at the same time. It should continue to be evaluated according to the empty area specified in Table 2 of this standard. Og
A3 5.1.3 of this standard also stipulates: When the blank area is greater than or equal to the index specified in Table 2, it is only allowed to appear at one place, and it shall not appear at both ends or both sides. As shown in Figure A5, the blank area is greater than or equal to 0.20B in width and 1 greater than or equal to 0.50L in length. Although it only appears at one place, but appears on one side, it should still be evaluated as unqualified. 526
JB/T9876—1999
1≥0.50/
As shown in Figure A6, although the blank area appears on the side, its width is less than 0.20B and its length is equal to (.301, which does not exceed the specified values in Table 2 at the same time, it should be evaluated as a qualified product. Finally, this surface can be evaluated as a qualified product. 2
JB/T 9876-1999
Appendix B
(Prompt Attachment)
Simple Measurement Method of Coating Thickness
Make a special cylindrical gauge (Figure B1) or rectangular gauge (Figure B2), the groove depth is 5um, and the protruding parts at both ends are used as support surfaces. When measuring, according to the groove and the width of the support surfaces at both ends, wipe the red lead coating in contact with the support surface with gasoline, and then put the gauge close to the surface of the measured part. Slowly roll or move the gauge, and the rolling or moving force is perpendicular to the coating direction. If the surface of the gauge groove is not stained with red, the measured red lead coating thickness is less than 5um. When starting to use this inspection method, in order to compare the coating thickness, you can make several sizes of gauges to facilitate mastering in production practice.25L
indicates that the width and length of this empty area exceed the indicators specified in Table 1 at the same time, and the contact uniformity is not good. This surface should still be evaluated as unqualified and no further evaluation is required.
= 0.33 2
As shown in Figure A4, the width of the pull area is less than 0.50B and the length is greater than or equal to 0.251, which does not exceed the indicators specified in Table 1 at the same time. It should continue to be evaluated according to the empty area specified in Table 2 of this standard. Og
A3 5.1.3 of this standard also stipulates: When the blank area is greater than or equal to the index specified in Table 2, it is only allowed to appear at one place, and it shall not appear at both ends or both sides. As shown in Figure A5, the blank area is greater than or equal to 0.20B in width and 1 greater than or equal to 0.50L in length. Although it only appears at one place, but appears on one side, it should still be evaluated as unqualified. 526
JB/T9876—1999
1≥0.50/
As shown in Figure A6, although the blank area appears on the side, its width is less than 0.20B and its length is equal to (.301, which does not exceed the specified values in Table 2 at the same time, it should be evaluated as a qualified product. Finally, this surface can be evaluated as a qualified product. 2
JB/T 9876-1999
Appendix B
(Prompt Attachment)
Simple Measurement Method of Coating Thickness
Make a special cylindrical gauge (Figure B1) or rectangular gauge (Figure B2), the groove depth is 5um, and the protruding parts at both ends are used as support surfaces. When measuring, according to the groove and the width of the support surfaces at both ends, wipe the red lead coating in contact with the support surface with gasoline, and then put the gauge close to the surface of the measured part. Slowly roll or move the gauge, and the rolling or moving force is perpendicular to the coating direction. If the surface of the gauge groove is not stained with red, the measured red lead coating thickness is less than 5um. When starting to use this inspection method, in order to compare the coating thickness, you can make several sizes of gauges to facilitate mastering in production practice.
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