JB/T 4328.6-1999 General technical conditions for machining of special-purpose electrical equipment General technical conditions for machining of special-purpose electrical equipment
Some standard content:
JB/T4328.6-1999
This standard is a revision of JB4328.6-86 "General Technical Conditions for Mechanical Processing of Electrical Equipment". This standard is proposed and managed by Shenyang Electrical Equipment Research Institute. This standard is drafted by Shenyang Electrical Equipment Research Institute and Shenyang Electrical Machinery Co., Ltd. The main drafter of this standard is Ren Xiaofang.
This standard is entrusted to Shenyang Electrical Equipment Research Institute for interpretation. 116
Machinery Industry Standard of the People's Republic of China
Electrician Special Equipment
General Technical Conditions for Machining
Machinery working general requirementsforthe electrician special equipmentJB/T.4328.6--1999
Replaces JB4328.6-86
This standard specifies the requirements, inspection rules, marking and certificates for machining parts and components of electrician special equipment products. This standard applies to the machining of parts and components of electrician special equipment products. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of the standard, 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/T31997 ||tt | GB/T1415-1992
GB/T1568--1997
GB/T1804-1992
GB/T4458.4—1984
GB/T 5796.4—1986
GB/T6403.41986
3 Requirements
General requirements
Ordinary thread finish, shoulder distance, undercut and chamfer (eqvISO3508:1976) Center hole
Ordinary thread basic dimensions (diameter 1~600mm) Ordinary thread tolerances and fits (diameter 1~355mm) Rectangular spline dimensions, tolerances and inspections
Shape and position tolerances are not Specifications for tolerance notesMetric taper thread (idtTOCT25229:1982) for common thread sizes for pipe screw-in endsKey technical conditions,
General tolerancesUnnoted tolerances for linear dimensions
Mechanical drawing dimension notes
Trapezoidal thread tolerances (eqvISO2903:1977)Part rounding and chamfering
3.1.1All machined parts and components must comply with the requirements of product drawings, process specifications and this standard. 3.1.2
The machined surface of the parts shall not be allowed to have rust and defects such as knocks, collisions, and scratches that affect performance, life and appearance quality. Burrs shall be removed from machined parts. Unless otherwise specified, sharp edges and sharp angles shall be 0.5×45° and not greater than R0.5. For heat-treated parts, burns, cracks and other defects shall not occur during fine machining. Approved by the State Bureau of Machinery Industry on August 6, 1999, and implemented on January 1, 2000
JB/T4328.6--1999
Working surfaces such as mating surfaces, friction surfaces and positioning surfaces after fine machining are not allowed to be printed or marked. Parts that need to be assembled and processed should have assembly marks. Surfaces processed by rolling; there should be no cracking or peeling after rolling, and the number of rolling times should not exceed three times. The center hole of the part should comply with the provisions of GB/T145. When the drawing does not indicate whether it is retained or not, the center hole is allowed to be retained. When parts are circulated, necessary station tools should be used to prevent deformation, damage and corrosion. 3.1.9
3.2 Limit deviation of untoleranced dimensions
The limit deviation of untoleranced dimensions of machined parts shall comply with the IT14 tolerance grade specified in GB/T1804-1992. H14 is used for holes, h14 for shafts, and ±IT14 (i.e. JS14 or js14) for length. The limit deviation values are shown in Table 1. Table 1
Basic dimensions
(is14)
Basic dimensions
(is14)
>10~18
Castings, forgings and welded parts,
One side is machined,
>18-30
>50~80
>80~120
The limit deviation of the un-toleranced dimensions shall be taken as 70% of the limit deviation of the un-machined un-toleranced dimensions specified in the general technical conditions for electrical special equipment, plus or minus values. 3.3
The limit deviation of the un-toleranced angle shall be as specified in Table 2. Table 2
Tolerance Grade
(General Grade)
(Rough Grade)
(Roughest Grade)
>10~50
>50~120
>120~400bzxz.net
±10°
± 15°
±20°
Note: The length values in the table are determined by the length of the short side. In case of cone angle, the cone with a taper of 1:3~1:500 is determined by the cone length; the cone with a taper greater than 1:3 is determined by its cable length.
3.4 The chamfer size and fillet radius of the parts shall be implemented in accordance with the provisions of GB/T6403.4. 118
3.5 Unspecified shape and position tolerances
JB/T4328.6—1999
3.5.1 For parts without specified straightness and flatness on the drawing, they shall be in accordance with Class C in Table 1 of GB/T1184-1996. The parameters and tolerance values are shown in Table 3. The main parameter L is shown in Figure 1.
Main parameter L
>10~16
>25~40
>40~63
Main parameter L legend
Tolerance value
Main parameter L
>63~100
>100~160
>160-250
>250-400
>400~630
Tolerance value
Main parameter L
>630~1000
>1000~1600
>1600~2500
>2500~4000
>4000~6000
Tolerance value
The tolerances of coaxiality and symmetry not indicated on the drawing shall be in accordance with Grade C in Table 2 of GB/T1184-1996. The parameters and tolerance values are shown in Table 4 of 3.5.2
. However, the axis of the stable design support surface or the center plane shall be selected as the reference. The main parameters d, B, D, and L are shown in Figures 2 to 5. Table 4
Main parameters
d, B, D, L
>10~18
>18~30
>30~50
Tolerance value
Main parameters
d, B, D, L
>50120
>120~250
>2 50~500
>500~800
>800~1250
>1250-2000||tt ||Tolerance value
Main parameters
d, B, D, L
>2000~3150
>3150~5000
>5000~8000
>8000~10000
Tolerance value
JB/T4328.6-1999
Main parameters d, B, D, L See Figure 2, Figure 3, Figure 4, Figure 5: Figure 2
3.5.3 Roundness tolerance should not be greater than the size tolerance value. Figure 3
3.5.4 The unmarked cylindrical surface is controlled by roundness, straightness of element line, unmarked tolerance value and element size tolerance respectively. 3.5.5 Parallel elements not marked with (E) are controlled by the unmarked tolerance value of flatness or straightness and the dimensional tolerance between parallel elements respectively. 3.5.6 The vertical elements and inclined elements are controlled by the angle tolerance and the unindicated tolerance value of straightness or flatness respectively. 3.5.7 The tolerance value of circular runout and total runout shall not be greater than the combined value of the unindicated tolerance of the shape and position of the element. 3.5.8 The dimensions of parts to be plated (coated) shall be implemented in accordance with the relevant provisions of GB/T4458.4 on the dimensions of plated and coated surfaces if "before plating (coating)" or "after plating (coating)" is not indicated on the drawings. The matching dimensions are the dimensions after plating, and the non-matching dimensions are the dimensions before plating. 3.6 Thread processing requirements
3.6.1 The basic dimensions of ordinary threads shall comply with the provisions of GB/T196. 3.6.2 The basic dimensions of the threaded end of the connecting thread used for the accessories in the pipeline to be screwed into the body shall comply with the provisions of GB/T1414. 3.6.3 The basic dimensions and tolerances of the connecting threads (except for threads for water and gas pipelines) used for gas or liquid pipeline systems and sealed by threads shall comply with the provisions of GB/T1415.
3.6.4 When the drawing does not indicate the processing accuracy and surface roughness of the thread, the following provisions shall apply. 3.6.4.1 The accuracy of ordinary threads shall be in accordance with the 6H grade in Table 7 of GB/197-1981 and the 6g grade in Table 8. The maximum allowable value of the thread working surface roughness Ra is 6.3μm
3.6.4.2 The accuracy of trapezoidal threads shall be in accordance with the 9th grade accuracy specified in Table 4 and Table 5 of GB/T5796.41986. Surface roughness: The maximum allowable value of Ra for internal threads is 3.2um, and the maximum allowable value of Ra for external threads is 1.6wm. 3.6.4.3 The maximum allowable value of the surface roughness Ra of metric threads used for thread sealing in oil and gas lines is 3.2μm, and the accuracy shall be in accordance with the 4H, 5H, and 4h grades specified in GB/T197-1981. JB/T4328.6-1999
3.6.4.4 The precision of transition fit thread shall be in accordance with the 4H, 5H and 4h grades specified in GB/T197-1981, and the surface roughness: the maximum allowable value of internal thread Ra is 3.2um: the maximum allowable value of external thread Ra is 1.6μm. The thread tail, back groove, chamfer and shoulder distance shall comply with the provisions of GB/T3. 3.6.5
The machined surface of the thread shall not have defects such as black skin, flattening, random buckles and burrs. 3.6.7
The coaxiality of the external thread axis to the rod axis and the internal thread axis to the hole axis shall not be greater than half of the dimensional tolerance of the external thread major diameter and the internal thread minor diameter respectively.
3.6.8 The verticality of the axis of the tapped internal thread bottom hole to the end face shall comply with the provisions of Table B3 of GB/T1184-1996, of which the hand tapping shall take 12 grades and the machine tapping shall take 11 grades.
3.7 Processing requirements for keys and keyways
The key surface is not allowed to have cracks, floating rust, oxide scale and other defects that affect use. 3.7.2
The tensile strength of the key shall not be less than 0.06MPa. When the ratio of key length L to key width b is greater than or equal to 8. The parallelism of the b surface in the length direction shall comply with the provisions of Table 3.7.3
B3 of GB/T1184-1996, when b≤6mm, it shall be grade 7: b≥8 to 36mm, it shall be grade 6: when b≥40mm, it shall be grade 5. 3.7.4 The deviation of the width of the shaft groove and wheel groove of ordinary flat keys shall comply with the provisions of GB/T1095. 3.7.5
The deviation of the width and depth of the shaft groove and wheel groove of ordinary wedge keys and hook wedge keys shall comply with the provisions of GB/T1563. 3.7.6
The cross-sectional shape and dimensional deviation of the rectangular spline shaft and hole shall comply with the provisions of GB/T1144. When the ratio of key length to key width is greater than or equal to 8, the straightness and flatness of the flat key shall comply with the provisions of Grade 9 in Table B1 of GB/T1184-1996 3.7.7
.
3.7.8 The parallelism of the center plane of the shaft groove or wheel hub groove to the axis of the shaft or wheel hub shall comply with the provisions of Grade 7 in Table B3 of GB/T1184-1996, 3.7.9
The symmetry of the center plane of the shaft groove or wheel hub groove to the axis of the shaft or wheel hub shall comply with the provisions of Grade 9 in Table B4 of GB/T1184-1996: 4 Inspection rules
All machined parts and components shall be inspected by the quality inspection department of the manufacturer according to the drawings, relevant technical documents and standards. The items are as follows:
a) Appearance;
b) Geometric shape and size:
c) Accuracy and surface roughness.
5 Marks and certificates
The mechanical parts and components that have passed the inspection shall be accompanied by the manufacturing quality inspection department mark. For the parts and components that cannot be marked, a certificate of conformity shall be attached, which shall indicate: a) the manufacturer's name or production batch number;
b) the name, drawing code and quantity of the parts, components; c) the standard number.
*Caolu Yiwei* provides high-quality documents. If the documents you download are missing pages, blurred, etc., or you encounter scarce files that cannot be found, please send a message to me on the site! I will definitely help you solve it! I have more than 200,000 domestic and international standards, including the full range of GB national standards and domestic industry and department standards, the full range of BSIEN
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and many other international standards. Docin download website: http://www.docin.com/liuyx866GB/T1144. When the ratio of key length to key width is greater than or equal to 8, the straightness and flatness of the flat key shall be in accordance with the 9th grade 3.7.7 of Table B1 of GB/T1184-1996.
3.7.8 The parallelism of the center plane of the shaft groove or hub groove to the axis of the shaft or hub shall be in accordance with the 7th grade of Table B3 of GB/T1184-1996, 3.7.9
The symmetry of the center plane of the shaft groove or hub groove to the axis of the shaft or hub shall be in accordance with the 9th grade of Table B4 of GB/T1184-1996: 4 Inspection rules
All machined parts and components shall be inspected by the quality inspection department of the manufacturer according to the drawings, relevant technical documents and standards. The items are as follows:
a) Appearance;
b) Geometric shape and size:
c) Accuracy and surface roughness.
5 Marks and Certificates
Qualified mechanical parts and components shall be accompanied by the mark of the manufacturing quality inspection department. Parts and components that cannot be marked shall be accompanied by a certificate of conformity, which shall indicate: a) manufacturer's name or production batch number;
b) parts, components, names, drawing codes and quantities; c) this standard number.
*Cao Lu Yi Wei* provides high-quality documents. If the documents you download are missing pages, blurred, etc., or you encounter scarce files that cannot be found, please send a message to me! I will definitely help you solve it! I have more than 200,000 domestic and foreign standards, including a full range of GB national standards and domestic industry and department standards, a full range of BSIEN
SSPC ANSIIEC
AASHTO
TBRRCC
national classifications
and many other international standards. Docin download website: http://www.docin.com/liuyx866GB/T1144. When the ratio of key length to key width is greater than or equal to 8, the straightness and flatness of the flat key shall be in accordance with the 9th grade 3.7.7 of Table B1 of GB/T1184-1996.
3.7.8 The parallelism of the center plane of the shaft groove or hub groove to the axis of the shaft or hub shall be in accordance with the 7th grade of Table B3 of GB/T1184-1996, 3.7.9
The symmetry of the center plane of the shaft groove or hub groove to the axis of the shaft or hub shall be in accordance with the 9th grade of Table B4 of GB/T1184-1996: 4 Inspection rules
All machined parts and components shall be inspected by the quality inspection department of the manufacturer according to the drawings, relevant technical documents and standards. The items are as follows:
a) Appearance;
b) Geometric shape and size:
c) Accuracy and surface roughness.
5 Marks and Certificates
Qualified mechanical parts and components shall be accompanied by the mark of the manufacturing quality inspection department. Parts and components that cannot be marked shall be accompanied by a certificate of conformity, which shall indicate: a) manufacturer's name or production batch number;
b) parts, components, names, drawing codes and quantities; c) this standard number.
*Cao Lu Yi Wei* provides high-quality documents. If the documents you download are missing pages, blurred, etc., or you encounter scarce files that cannot be found, please send a message to me! I will definitely help you solve it! I have more than 200,000 domestic and foreign standards, including a full range of GB national standards and domestic industry and department standards, a full range of BSIEN
SSPC ANSIIEC
AASHTO
TBRRCC
national ship classification
and many other international standards. Docin download website: http://www.docin.com/liuyx866
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