1 Scope
This part of JB/T 5000 specifies the technical requirements, test methods, acceptance regulations, sign and certification of non ferrous casting.
This part is applicable to the copper alloy, aluminum alloy, and zinc alloy castings produced by the sand mold, metal mold and centrifugal casting methods.
2 Normative References
The provisions in following documents, through reference in this Part of JB/T 5000, constitute the articles of this Part. For dated reference, subsequent amendments to (excluding corrigenda), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest edition of the normative document is applicable to this part.
GB/T 228 "Metallic Materials-Tensile Testing at Ambient Temperature" (GB/T 228-2002, eqv ISO 6892: 1998)
GB/T231.1 Metallic materials - Brinell hardness test - Part 1: Test method GB/T 231.1-2002, eqv ISO 6506-1:1999(E)
GB/T 1173 Casting aluminum alloys (GB/T 1173-1995, neq. ASTM B26:1992)
GB/T 1175 "Casting Zinc Alloys"
GB/T 1176 "Specification for cast copper alloys" (GB/T 1176-1987, neq ISO 1338: 1977)
GB/T 6060.1 Roughness comparison specimens--Cast surfaces (GB/T 6060.1-1997, eqv ISO 2632-3:1979)
GB/T 6414 Castings--System of dimensional tolerances and machining allowances (GB/T 6414-1999, eqv ISO 8062:1994)
JB/T 5000.13 Heavy Mechanical General Techniques and Standards-Part 13: Packing
3 Technical Requirements
3.1 Chemical Composition and Mechanical Property
3.1.1 Chemical composition and mechanical property of aluminum alloy casting shall meet the requirements of GB/T 1173.
3.1.2 Chemical composition and mechanical property of zinc alloy casting shall meet the requirements of GB/T 1175.
3.1.3 Chemical composition and mechanical property of copper alloy casting shall meet the requirements of GB/T 1173.
3.1.3.1 For the copper alloy castings that bear heavy load and are used for key positions, such as worm gear, wheel rim, and screw box and those whose maximum size is more than 500mm, mechanical property shall be used as the key acceptance basis. Little deviation is permitted in the chemical composition and its value shall be 10% of upper and lower limits of percentage composition for each main component.
3.1.3.2 For various bushings, bearing bush as well as sliding plate type copper alloy casting that bear light loads, are used for general positions and the maximum size is not greater than 500mm, chemical composition or mechanical property both can be taken as the acceptance basis; if either of them is qualified, it can be considered as qualification; the other one is only used for reference but it must have data.
3.2 Dimensional Tolerance and Configuration of Tolerance Zone
3.2.1 Dimensional tolerance shall meet the requirements of GB/T 6414; common class code and tolerance see Table 1. The same casting shall select the same tolerance class and tolerance class shall be selected according to basic size of rough casting.
3.2.2 Dimensional tolerance zone for Castings shall be distributed symmetrically in relation To basic size of rough casting, namely half of tolerance shall be located above the basic size and other half shall be below the basic size (see Figure 1). If there is special requirement, tolerance zone also can be distributed asymmetrically but must be noted in drawing or specified in technological document.
Contents
Foreword i
1 Scope
2 Normative References
3 Technical Requirements
3.1 Chemical Composition and Mechanical Property
3.2 Dimensional Tolerance and Configuration of Tolerance Zone
3.3 Mismatch (Mismatching Mould)
3.4 Machining Allowance
3.5 Examples of Calculation for Size of Rough Casting (see Table 3)
3.6 Geometrical Shape, Dimension
3.7 Surface Quality Requirement
3.8 Finishing of Defect
4 Test Methods
5 Acceptance Rules
6 Marking and Package
6.1 Marking and Quantity Certificate
6.2 Package
