JB/T 9872-1999 General technical requirements for machining parts of metal cutting machine tools
Some standard content:
ICS25.080
JB-T9660-1999 Cable duct
Mechanical industry standard of the People's Republic of China
JB/T 9871~9879-1999
Metal cutting machine tools
Metal cutting machine tools
Metal cutting machine tools
Metal cutting machine tools
Metal cutting machine tools
Metal cutting machine tools
Metal cutting machine tools
Metal cutting machine tools
1999-05-20 Release
Three standards guarantee
Accuracy classification
General technical conditions for machined parts
General technical conditions for welded parts
General technical conditions for assembly
Compilation of random technical documents
Inspection and evaluation of joint surface color coating method
Determination of cleanliness
Determination of dust concentration
Oil mist concentration measurement method
2000-01-01 Implementationwww.bzxz.net
JB/T9872-1999
This standard is a revision of ZBnJ50008.1-88 "General Technical Conditions for Machined Parts of Metal Cutting Machine Tools". The original version was formulated on the basis of referring to foreign advanced standards, summarizing my country's production experience, and considering the use requirements of users. Its technical content can still meet the current scientific and technological level and adapt to production and use needs. This standard is consistent with the technical content of ZBJ50008.188, and the main differences are: 1) All referenced standards are changed to the new version of the standard, and the relevant technical content has been adjusted accordingly; 2) It has been re-edited according to relevant regulations. This standard replaces ZBJ50008.1-88 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 National Technical Committee for Standardization of Metal Cutting Machine Tools. The responsible drafting unit of this standard: Beijing Machine Tool Research Institute. This standard was first issued in June 1988.
1 Scope
Mechanical Industry Standards of the People's Republic of China
Metal Cutting Machine Tools
General Technical Conditions for Machined Parts
JB/T9872-1999
Replaces ZBnJ50008.1-88
This standard specifies the technical requirements in the design and manufacturing process of machined parts of metal cutting machine tools (hereinafter referred to as machine tools). This standard applies to the design and manufacture of mechanical parts for metal cutting 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 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/T 158 — 1996 | | tt | 1988
GB/T10096—1988
GB/T 11162—1989
GB/T11334—1989
GB/T11335—1989
GB/T11365—1989
GB/T 17587.3---1998
JB/T2886—1992
JB/T 3579—1991
JB/T3997—1994
JB/T4316.2-1999
JB/T 5563--1991
JB/T9876—1999
3 Basic requirements
T-slots and corresponding bolts for machine tool worktables
General thread tolerances and fits (diameter 1~355mm) Fits between rolling bearings and shafts and housings
Dimensions, tolerances and inspections of rectangular splines
General tolerances Unspecified tolerances for linear dimensions
Precision of cylindrical worms and worm wheels
Precision of involute cylindrical gears
Precision of racks
General technology for optical graticule parts Conditions
Conical tolerance
Limit deviation of angle without tolerance
Accuracy of bevel gears and hypoid gears
Ball screw pairs Part 3: Acceptance conditions and acceptance inspection Technical conditions for trapezoidal thread screws and nuts for machine tools General technical conditions for epoxy-coated sliding guides Technical conditions for gray iron castings for metal cutting machine tools Accuracy inspection of spur gear discs
Inspection and evaluation of conical surfaces of metal cutting machine tools by color coating Inspection and evaluation of joint surfaces of metal cutting machine tools by color coating 3.1 The machined parts shall comply with the requirements of drawings, process documents and relevant standards. 3.2 Defects on castings that do not affect the use and appearance are allowed to be repaired in accordance with relevant regulations. Approved by the State Bureau of Machinery Industry on May 20, 1999 and implemented on January 1, 2000
JB/T9872-1999
3.3 Important castings must be aged after rough machining. Important castings of machine tools with precision grades of III and above must also be aged after semi-finishing.
3.4 When the sharp edges and corners of the workpiece are not specified in the drawing (except for specified requirements), they must be chamfered, blunted and deburred. The chamfer width and angle at the intersection of the machined surface and the burr shall comply with the requirements of the drawing. The thickness of the first thread end of the lead screw, worm, etc. shall be greater than 1mm, and the incomplete thread shall be removed if the thickness is less than 1mm. 3.5 The surface of the workpiece that is no longer processed after heat treatment should be cleaned. The gloss of the workpiece after surface treatment should be uniform. 3.6 When the limit deviation of the workpiece size is not specified, it shall comply with the m grade specified in GB/T1804. When the blind hole depth of the workpiece is not specified with tolerance, its limit deviation shall not exceed the provisions of Table 1, and drilling through is not allowed. Table 1
>50~100
3.7 For the taper and angle of the machined parts without tolerance, if there is a matching requirement, it shall be in accordance with the AT12 grade specified in GB/T11334, and if there is no matching requirement, it shall comply with the C grade specified in GB/T11335. 3.8 For the ordinary threads of the machined parts without tolerance code, it shall be in accordance with the provisions of GB/T197, with internal thread 6H and external thread 6g. 3.9 The cones of the machine tool spindle, sleeve and its matching mandrel, center and other machined parts shall be inspected by the coloring method with gauges. The contact of the cone shall be close to the large end, and the contact ratio of the actual contact length to the workpiece length shall not be lower than the provisions of Table 2, and shall be inspected in accordance with JB/T5563. Note: The contact of the cone with special requirements is allowed to be close to the small end. Table 2
Machine tool accuracy grade
Sub-grade and grade III and above
Contact ratio value
3.10 The machined surface of the workpiece shall not have defects such as bumps, scratches and rust, and the thread surface shall not have indentations. During transportation and storage, the workpiece must be prevented from damage and deformation.
4 Basic requirements for main machined parts
4.1 Guide surface and mating surface
4.1.1 The machining accuracy of the guide surface shall be guaranteed to meet the accuracy standards and technical requirements of various types of machine tools, and a certain reserve shall be left. 4.1.2 The mating surface of two mating parts processed by mechanical processing methods shall be tested for contact by color coating method. The inspection method and contact index 8
According to the provisions of JB/T9876.
JB/T9872-1999
4.1.3 The maximum allowable value of the surface roughness R of the guide rail surface and the particularly important fixed joint surface after machining shall be in accordance with the provisions of Table 3. Table 3
Machine tool accuracy grade
Grade III and above
Cast iron guide rail
Inlaid steel or steel guide rail
The base surface of the inlaid steel guide rail shall meet the requirements of the important fixed joint surface, 4.1.4
Displacement guide rail and particularly important fixed joint surface 0.8
4.1.5 The flat guide rail surface after machining shall not have obvious ripples, and the cylindrical guide rail surface shall not have obvious spiral lines. 4.1.6 The hardness, hardness difference and hardness test method of the cast iron guide rail surface shall comply with the provisions of relevant standards such as JB/T3997. The quenching quality of the guide rail surface shall comply with the provisions of relevant standards, and the hardness of the induction quenching guide rail shall generally not be lower than the requirements of Table 4. 4.1.7 Guide rail type Hardened cast iron sliding guide Hardened steel sliding guide Hardened steel rolling guide 4.1.8 Technical requirements for coated guide rails shall comply with the provisions of JB/T3579 and other standards. Hardness value 65 HS (48 HRC) 68HS (50HRC) 4.1.9 The bonding surface of the guide rail should be cleaned and the bonding of the guide rail surface should be firm without bubbles and gaps. After the guide rail is cured, it should be processed according to relevant regulations, and the edges of the guide rail plate should be chamfered and rounded. 4.2 Shafts and sleeves
4.2.1 The shaft should generally be normalized or quenched and tempered. The technical requirements of the spindle end with wear-resistant requirements and accessories and tools that are frequently disassembled should comply with relevant regulations, and the hardness should generally not be less than 48HRC. 4.2.2 The spindle journal that matches the rolling bearing should generally have a high point mark to ensure the rotation accuracy requirements. 4.2.3 The main connection dimensions and parts of the spindle end should comply with the provisions of relevant standards. 4.2.4 The hardness of the spindle journal that matches the bearing should not be less than 52HRC for sliding bearings, and should generally not be less than 48.HRC for rolling bearings. When the spindle journal is used as the raceway of the rolling bearing, its hardness should not be less than 60HRC. 4.2.5 The spindle journal, centering hole and centering surface of the clamping chuck or cutter disc should not have obvious ripples. 4.2.6 The contact of the cone of the spindle taper hole should meet the requirements of 3.9. The coaxiality of the centering hole to the journal should meet the requirements of the precision inspection standards of various types of machine tools, and leave a reserve.
4.2.7 The main technical requirements of the machine tool spindle or center sleeve should meet the requirements of the precision inspection standards of various types of machine tools. 4.2.8 The sleeve should be tempered and quenched, and the hardness of the taper hole should not be lower than 48HRC. 4.3 Box
4.3.1 The accuracy of the spindle hole on the box should meet the requirements of the precision inspection standards of various types of machine tools, and leave a reserve. 9
JB/T9872-1999
4.3.2 The shape tolerance of the rolling bearing hole on the box should meet the requirements of GB/T275. 4.3.3 The verticality of the end face of the hole on the housing to the hole axis should generally be determined according to the installation accuracy requirements of the selected bearing type and accuracy grade. 4.4 Gear
4.4.1 The accuracy of involute cylindrical gears should comply with the provisions of GB/T10095. The maximum allowable value of the accuracy grade and tooth surface roughness R, should generally be selected according to the recommended values in Table 5.
Application parts, circumferential speed
1) High-precision and precision indexing chain end gear2) Spur gear with circumferential speed v>30m/s
3) Helical gear with circumferential speed v>50m/s
1) General precision indexing chain end gear
2) High-precision and precision indexing chain intermediate gear3) Spur gear with circumferential speed v>15~30m/s4) Helical gear with circumferential speed v>30~50m/s1) Important gears of V-level machine tool main transmission
2) General precision indexing chain intermediate gear3) Grade III and Feed gears of machine tools with accuracy levels above grade V4) Oil pump gears
4) Spur gears with circumferential speed v>10~1Sm/s5) Helical gears with circumferential speed v>15~30m/s1) Feed gears of machine tools with accuracy levels above grade V and IV2) Spur gears with circumferential speed v>6~10m/s3) Helical gears with circumferential speed v>8~15m/sGear accuracy levels
Maximum allowable value of tooth surface roughness R,
Note: The gear accuracy levels listed in the table refer to the main tolerance groups among the three tolerance groups of gear accuracy, and non-main tolerance groups are allowed to be one level lower. 4.4.2 The runout of the reference end face of the gear is given according to the gear accuracy level and the end face diameter size4.4.3 For gears that have a significant impact on noise and murmur, when their circumferential speed exceeds the values listed in Table 6, tooth profile trimming should generally be performed. Table 6
Gear accuracy grade (tolerance group II)
Gear type
Spur gear
Helical gear
Grade 5 and above
Circumferential speed
JB/T9872-1999
4.4.4 The teeth of high-speed, heavy-load and sliding gears in the transmission system shall be quenched, carburized, surface nitrided, etc., and shall comply with the provisions of relevant standards.
4.5 The tooth ends of sliding gears shall be rounded and quenched, and the rectangular internal splines of the gear reference hole shall comply with the provisions of GB/T1144. 4.4.6 The accuracy of bevel gears shall comply with the provisions of GB/T11365. 4.4.7 The accuracy of racks shall comply with the provisions of GB/T10096. 4.5 Worm gear pair
The accuracy of worm gear pair shall comply with the provisions of GB/T10089 and meet the requirements of various types of machine tool accuracy inspection standards. Its accuracy grade and maximum allowable value of tooth surface roughness R, shall generally be selected according to the recommended values in Table 7. Table 7
Maximum allowable value of tooth surface roughness R,
Application parts
High-precision hobbing machine indexing worm gear pair
Gear grinding machine indexing worm gear pair
General gear machine tool indexing worm gear pair
Gear machine tool feed system
General machine tool feed system
4.6 Trapezoidal thread screw pair
Gear accuracy grade
4.6.1 The accuracy of the processed trapezoidal thread screw and nut shall comply with the provisions of JB/T2886. μm
The selection of the accuracy level of the lead screw should meet the requirements of the accuracy standards of various types of machine tools. Generally, the lead screw without correction device should be one level higher. 4.6.2 The lead screw should have a certain wear resistance and be subjected to an appropriate number of aging treatments during the processing. 4.7 Ball screw pair
4.7.1 The ball screw pair should comply with the provisions of GB/T17587.3. 4.7.2 The selection of the accuracy level of the ball screw pair at the end of the machine tool transmission chain should meet the requirements of the accuracy inspection standards of various types of machine tools. The closed-loop system CNC machine tool can choose a ball screw pair with a slightly lower or the same accuracy level as the open-loop system CNC machine tool. 4.8 Other parts
4.8.1 Wear-resistant measures should be taken for the positioning surfaces of the indexing and positioning parts. 4.8.2 The end gear disc should select the accuracy level according to the use requirements and JB/T4316.2. 4.8.3 The machined parts with T-slots should generally comply with the provisions of GB/T158. 4.8.4 The scaled parts shall have accurate and evenly spaced lines, with clear numbers and marks. The numbers shall be engraved in the central symmetrical position of the lines. If chrome plating is used, it shall be matte chrome plating. 4.8.5 The technical requirements for the lines on optical graticule parts shall comply with the relevant provisions of GB/T11162. 4.8.6 The parts of steel screws, nuts and similar parts subjected to extrusion and other effects that are often subjected to torsion and easy to wear shall be heat treated, and their hardness shall not be less than 35HRC.The maximum allowable value should generally be selected according to the recommended values in Table 5.
Application parts, circumferential speed
1) High-precision and precision indexing chain end gear2) Spur gears with circumferential speed v>30m/s
3) Helical gears with circumferential speed v>50m/s
1) General precision indexing chain end gear
2) High-precision and precision indexing chain intermediate gear3) Spur gears with circumferential speed v>15~30m/s4) Helical gears with circumferential speed v>30~50m/s1) Important gears of V-class machine tool main transmission
2) General precision indexing chain intermediate gear3) Class III and Feed gears of machine tools with accuracy levels above grade V4) Oil pump gears
4) Spur gears with circumferential speed v>10~1Sm/s5) Helical gears with circumferential speed v>15~30m/s1) Feed gears of machine tools with accuracy levels above grade V and IV2) Spur gears with circumferential speed v>6~10m/s3) Helical gears with circumferential speed v>8~15m/sGear accuracy levels
Maximum allowable value of tooth surface roughness R,
Note: The gear accuracy levels listed in the table refer to the main tolerance groups among the three tolerance groups of gear accuracy, and non-main tolerance groups are allowed to be one level lower. 4.4.2 The runout of the reference end face of the gear is given according to the gear accuracy level and the end face diameter size4.4.3 For gears that have a significant impact on noise and murmur, when their circumferential speed exceeds the values listed in Table 6, tooth profile trimming should generally be performed. Table 6
Gear accuracy grade (tolerance group II)
Gear type
Spur gear
Helical gear
Grade 5 and above
Circumferential speed
JB/T9872-1999
4.4.4 The teeth of high-speed, heavy-load and sliding gears in the transmission system shall be quenched, carburized, surface nitrided, etc., and shall comply with the provisions of relevant standards.
4.5 The tooth ends of sliding gears shall be rounded and quenched, and the rectangular internal splines of the gear reference hole shall comply with the provisions of GB/T1144. 4.4.6 The accuracy of bevel gears shall comply with the provisions of GB/T11365. 4.4.7 The accuracy of racks shall comply with the provisions of GB/T10096. 4.5 Worm gear pair
The accuracy of worm gear pair shall comply with the provisions of GB/T10089 and meet the requirements of various types of machine tool accuracy inspection standards. Its accuracy grade and maximum allowable value of tooth surface roughness R, shall generally be selected according to the recommended values in Table 7. Table 7
Maximum allowable value of tooth surface roughness R,
Application parts
High-precision hobbing machine indexing worm gear pair
Gear grinding machine indexing worm gear pair
General gear machine tool indexing worm gear pair
Gear machine tool feed system
General machine tool feed system
4.6 Trapezoidal thread screw pair
Gear accuracy grade
4.6.1 The accuracy of the processed trapezoidal thread screw and nut shall comply with the provisions of JB/T2886. μm
The selection of the accuracy level of the lead screw should meet the requirements of the accuracy standards of various types of machine tools. Generally, the lead screw without correction device should be one level higher. 4.6.2 The lead screw should have a certain wear resistance and be subjected to an appropriate number of aging treatments during the processing. 4.7 Ball screw pair
4.7.1 The ball screw pair should comply with the provisions of GB/T17587.3. 4.7.2 The selection of the accuracy level of the ball screw pair at the end of the machine tool transmission chain should meet the requirements of the accuracy inspection standards of various types of machine tools. The closed-loop system CNC machine tool can choose a ball screw pair with a slightly lower or the same accuracy level as the open-loop system CNC machine tool. 4.8 Other parts
4.8.1 Wear-resistant measures should be taken for the positioning surfaces of the indexing and positioning parts. 4.8.2 The end gear disc should select the accuracy level according to the use requirements and JB/T4316.2. 4.8.3 The machined parts with T-slots should generally comply with the provisions of GB/T158. 4.8.4 The scaled parts shall have accurate and evenly spaced lines, with clear numbers and marks. The numbers shall be engraved in the central symmetrical position of the lines. If chrome plating is used, it shall be matte chrome plating. 4.8.5 The technical requirements for the lines on optical graticule parts shall comply with the relevant provisions of GB/T11162. 4.8.6 The parts of steel screws, nuts and similar parts subjected to extrusion and other effects that are often subjected to torsion and easy to wear shall be heat treated, and their hardness shall not be less than 35HRC.The maximum allowable value should generally be selected according to the recommended values in Table 5.
Application parts, circumferential speed
1) High-precision and precision indexing chain end gear2) Spur gears with circumferential speed v>30m/s
3) Helical gears with circumferential speed v>50m/s
1) General precision indexing chain end gear
2) High-precision and precision indexing chain intermediate gear3) Spur gears with circumferential speed v>15~30m/s4) Helical gears with circumferential speed v>30~50m/s1) Important gears of V-class machine tool main transmission
2) General precision indexing chain intermediate gear3) Class III and Feed gears of machine tools with accuracy levels above grade V4) Oil pump gears
4) Spur gears with circumferential speed v>10~1Sm/s5) Helical gears with circumferential speed v>15~30m/s1) Feed gears of machine tools with accuracy levels above grade V and IV2) Spur gears with circumferential speed v>6~10m/s3) Helical gears with circumferential speed v>8~15m/sGear accuracy levels
Maximum allowable value of tooth surface roughness R,
Note: The gear accuracy levels listed in the table refer to the main tolerance groups among the three tolerance groups of gear accuracy, and non-main tolerance groups are allowed to be one level lower. 4.4.2 The runout of the reference end face of the gear is given according to the gear accuracy level and the end face diameter size4.4.3 For gears that have a significant impact on noise and murmur, when their circumferential speed exceeds the values listed in Table 6, tooth profile trimming should generally be performed. Table 6
Gear accuracy grade (tolerance group II)
Gear type
Spur gear
Helical gear
Grade 5 and above
Circumferential speed
JB/T9872-1999
4.4.4 The teeth of high-speed, heavy-load and sliding gears in the transmission system shall be quenched, carburized, surface nitrided, etc., and shall comply with the provisions of relevant standards.
4.5 The tooth ends of sliding gears shall be rounded and quenched, and the rectangular internal splines of the gear reference hole shall comply with the provisions of GB/T1144. 4.4.6 The accuracy of bevel gears shall comply with the provisions of GB/T11365. 4.4.7 The accuracy of racks shall comply with the provisions of GB/T10096. 4.5 Worm gear pair
The accuracy of worm gear pair shall comply with the provisions of GB/T10089 and meet the requirements of various types of machine tool accuracy inspection standards. Its accuracy grade and maximum allowable value of tooth surface roughness R, shall generally be selected according to the recommended values in Table 7. Table 7
Maximum allowable value of tooth surface roughness R,
Application parts
High-precision hobbing machine indexing worm gear pair
Gear grinding machine indexing worm gear pair
General gear machine tool indexing worm gear pair
Gear machine tool feed system
General machine tool feed system
4.6 Trapezoidal thread screw pair
Gear accuracy grade
4.6.1 The accuracy of the processed trapezoidal thread screw and nut shall comply with the provisions of JB/T2886. μm
The selection of the accuracy level of the lead screw should meet the requirements of the accuracy standards of various types of machine tools. Generally, the lead screw without correction device should be one level higher. 4.6.2 The lead screw should have a certain wear resistance and be subjected to an appropriate number of aging treatments during the processing. 4.7 Ball screw pair
4.7.1 The ball screw pair should comply with the provisions of GB/T17587.3. 4.7.2 The selection of the accuracy level of the ball screw pair at the end of the machine tool transmission chain should meet the requirements of the accuracy inspection standards of various types of machine tools. The closed-loop system CNC machine tool can choose a ball screw pair with a slightly lower or the same accuracy level as the open-loop system CNC machine tool. 4.8 Other parts
4.8.1 Wear-resistant measures should be taken for the positioning surfaces of the indexing and positioning parts. 4.8.2 The end gear disc should select the accuracy level according to the use requirements and JB/T4316.2. 4.8.3 The machined parts with T-slots should generally comply with the provisions of GB/T158. 4.8.4 The scaled parts shall have accurate and evenly spaced lines, with clear numbers and marks. The numbers shall be engraved in the central symmetrical position of the lines. If chrome plating is used, it shall be matte chrome plating. 4.8.5 The technical requirements for the lines on optical graticule parts shall comply with the relevant provisions of GB/T11162. 4.8.6 The parts of steel screws, nuts and similar parts subjected to extrusion and other effects that are often subjected to torsion and easy to wear shall be heat treated, and their hardness shall not be less than 35HRC.
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