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JB/T 6887-2004 English PDF (JBT6887-2004)

JB/T 6887-2004 English PDF (JBT6887-2004)

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JB/T 6887-2004: Technical condition of cast iron for fans blower and compressor

This Standard specifies the technical requirements, test methods and acceptance rules of cast iron for fans blower and compressors.
JB/T 6887-2004
ICS 23.120
J 72
Replacing JB/T 6887-1993, JB/T 6889-1993
Technical condition of cast iron
for fans blower and compressors
Issued by. National Development and Reform Commission, People's
Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Technical requirements ... 6
4 Test methods and inspection rules ... 18
5 Mark and certificate ... 20
6 Rejection ... 21
Annex A (Normative) The pattern drawing slope of casting wood appearance (JB/T 5105) ... 22
Annex B (Normative) Casting machining allowances (RMA) (GB/T 6414) ... 23 Annex C (Normative) Casting dimensional tolerances (GB/T 6414) ... 24
Annex D (Normative) Casting weight tolerance grade values (GB/T 11351) .. 25 Foreword
This Standard is a revision to JB/T 6887-1993 Technical Condition of Cast Iron for Fans Blower and Compressors.
This Standard made modification on normative references and added relevant content. In technical content and writing format, it made necessary modification to the previous edition.
Compared with JB/T 6887-1993, the main changes in this Standard are as
- merged the main content of JB/T 6887-1993 Technical Condition of Cast Iron for Fans Blower and Compressors into this Standard;
- re-specified that dimensional tolerances of casting and the level of
machining allowance shall be in accordance with Gb/T 6414-1999, which
improved quality level;
- the provisions on casting weight tolerance shall be in accordance with MT13 of GB/T 11351-1989; the only 7% weight deviation is not used;
- made higher requirements for channels of fans blower and compressors
and external surface quality, so as to meet requirements of market for
product quality;
- in the defect welding range, made a new division on casting classification; the one with the weight greater than 6300 kg is called as extra large piece to make casting of fans blower and compressors to meet the needs of
large-scale development;
- as the new process of vibration aging matures, this Standard, for the first time, specified that it is equivalent with annealing method for eliminating internal stress;
- made further specific provisions on bearing boxes, gearbox and other
casting kerosene test and casting primer coating for implementation;
- made a large deletion on welding process of original cast iron;
- Annex B is in accordance with the new machining allowance level value listed in GB/T 6414-1999 and added Annex D ?€?Casting weight tolerance
level value?€?.
Annex A, Annex B, Annex C, Annex D of this Standard are normative.
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee on Fans Blower and Compressors of Standardization Administration of China. The drafting organizations of this Standard. Shaanxi Blower (Group) Co., Ltd., Shenyang Blower (Group) Co., Ltd.
Main drafters of this Standard. Wang Kuiwang, Song Lili.
Versions of standard substituted by this Standard are.
- JB/T 6887-1993;
- JB/T 6889-1993.
Technical condition of cast iron
for fans blower and compressors
1 Scope
This Standard specifies the technical requirements, test methods and
acceptance rules of cast iron for fans blower and compressors.
This Standard is applicable to gray cast iron, ductile iron and the hammer wear- resistant ductile iron, high-silicon corrosion-resistant cast iron, cast iron and other alloyed cast irons used for turbines, blowers, compressors, expanders, Roots, Yip blowers (hereinafter referred to as casting).
2 Normative references
The following standards contain the provisions which, through reference in this Standard, constitute the provisions of this Standard. For dated references, subsequent amendments (excluding corrections) or revisions do not apply to this Standard. However, the parties who enter into agreement based on this Standard are encouraged to investigate whether the latest versions of these documents are applicable. For undated reference documents, the latest
versions apply to this Standard.
GB/T 223.3~78, Methods for chemical analysis of iron, steel and alloy
GB/T 228, Metallic materials - Tensile testing at room temperature (GB/T 228-2002, eqv ISO 6892.1998 (E))
GB/T 229, Metallic Charpy notched impact test (GB/T 229-1994, eqv ISO
GB/T 230, Metallic materials - Rockwell hardness test (GB/T 230-1991, neq ISO 6508.1986)
GB/T 231.1~3, Metallic materials - Brinell hardness test method
GB/T 1348, Spheroidal graphite iron castings
GB/T 3180, Specification for medium manganese wear-resistant spheroidal iron castings
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)
GB/T 7216, Metallographic test for gray cast iron (neq ISO 945.1975)
GB/T 8491, Corrosion resistant high silicon iron castings
GB/T 9437, Heat resistant iron castings
GB/T 9439, Grey iron castings
GB/T 9441, Metallographic test for spheroidal graphite cast iron
GB/T 11351, Mass tolerances for castings
GB/T 15056, Evaluation method on cast surface roughness
JB/T 5926, Vibrating stress relief effect-Evaluation methods
JB/T 6886, Technical specification for draught fan application
JB/T 7699, Technical specifications for wooden model and core box for
JB/T 7945, Methods for testing the mechanical properties of grey cast iron 3 Technical requirements
3.1 Materials
All types of cast irons in this Standard shall use the material designations which comply with the provisions of GB/T 9439, GB/T 1348, GB/T 9437, GB/T 8491, GB/T 3180.
3.2 Production method and heat treatment
Casting should be annealed or use vibration aging method to eliminate internal stress. The production method and heat treatment of castings shall be decided by the supplier. However, it must satisfy the designation specified in this Standard and relevant technical performances. The repeated heat treatment of adjusting mechanical properties and processing properties must not exceed twice. If it uses vibration aging, it shall strictly follow the provisions of JB/T 5926. When there are special requirements for heat treatment and internal stress elimination, it shall indicate in drawing or order agreement.
3.3 Mechanical properties and chemical composition
3.5.1 General
The geometrical shape and dimensions of castings shall comply with the
pattern or appearance when ordering and relevant agreement. The wood mold should be implemented according to the second grade of precision of JB/T 7699. The pattern draft not specified in the process shall comply with the provisions of Annex A.
3.5.2 Casting machining allowance If there is no special requirements for drawing, order agreement, casting bottom and side machining allowance shall be implemented according to H grade provisions of GB/T 6414-RMA (see Annex B). The top surface
machining allowance is 0.25 times of the corresponding bottom surface. The purchaser shall specify on the drawings the surface to be pre- machined by the foundry and the machining allowance required for the final machining, in order to achieve the machining allowance required by the pre- machined state or meet requirements of re-finished casting after secondary aging. The machining allowance is 1.2 ~ 1.5 times of the grade H value of GB/T 6414-RMA.
3.5.3 Unnoted dimensional tolerance
The general dimensional tolerance not specially noted in the drawings shall be implemented according to CT12 of GB/T 6414. See Annex C for its tolerance value. General tolerance zone should be symmetrical distributed, i.e., half of the tolerance is positive and the other half is negative. For some special cases, based on agreement of the designer and the casting producer, the tolerance can be partially or wholly positive or negative.
3.5.4 Dimensional tolerance of special parts of cast iron for fans blower and compressors The dimensional tolerance of casting wall thickness, rib thickness, web thickness and back room, diffuser blade thickness, when the basic size is less than 20 mm, shall be implemented according to CT11 of GB/T 6414; when the basic size is equal to or greater than 20 mm, it shall be implemented according to CT13 of GB/T 6414. The thickness tolerance of facetted flanges and fluid inlet and outlet flanges in chassis, bearing body, gearbox and oil pump, shell and other castings shall be implemented according to CT13 of GB/T 6414. Because the wrong box eccentric wheel, shaft and other rotating castings produce coaxial deviation, when ensuring sufficient processing capacity of the shaft hole and the outside of rim, the tolerance of concentricity b) shaft holes of hub, wheel, coupling, etc.;
c) hub surface of fan, Roots blower impeller surface (except end surfa...

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