JB/T 6944.1-1999 Technical requirements for pellet feed pressing machine
Some standard content:
4 Test methods
4.1 Preparation of test bars (blocks) and test specimens
4.1.1 The preparation of single cast test bars and attached cast test bars (blocks) shall comply with the provisions of GB/T9439. Other types of test bars approved by the ship inspection department may also be used.
4.1.2 The tensile test specimen shall adopt Type A in JB/T7945. 4.1.3 The test bars (blocks) and test specimens shall be clearly marked so that the castings they represent can be identified. 4.2 The tensile test shall comply with the provisions of JB/T7945. 4.3 The hardness test shall comply with the provisions of Appendix A of GB/T9439-1988 and GB/T231. 4.4, Chemical analysis shall comply with the provisions of GB/T223.1~223.5. 4.5 The metallographic examination of castings shall comply with the provisions of GB/T7216. 4.6 The casting surface roughness inspection of castings shall comply with the provisions of GB/T6060.1. . Use the corresponding casting surface roughness comparison sample for evaluation.
5 Inspection rules
5.1 The quality inspection department of the manufacturer shall inspect the mechanical properties, geometric shape, size and surface defects of the castings according to the product drawings or relevant technical documents. The purchaser has the right to conduct random inspection or re-inspection of the castings. 5.2 The appearance quality of the castings shall be inspected 100%. 5.3 In addition to the first piece of the castings that must be inspected during each production, the castings produced in continuous batches may be inspected. The number and method of random inspection shall be carried out in accordance with the provisions of GB/T2828. 5.4 For certain important castings determined by the ship inspection department, the surveyor shall inspect and approve them, and mark them with the inspection mark of the ship inspection department. 5.5 Other inspection rules shall comply with the provisions of GB/T9439. 6 Marking and certificate of conformity
6.1 Castings that have passed the inspection shall be accompanied by the mark of the quality inspection department of the manufacturer. 6.2 Castings should be accompanied by a certificate of conformity when leaving the factory. The following should be noted: a) Manufacturer name or code:
b) Part name, drawing number and delivery quantity: c) Casting brand (important castings should indicate the furnace number, package number and sequence number): d) Chemical composition and mechanical properties test results; e) Other technical content descriptions (such as heat treatment methods, repair methods, etc.). 6.3 For castings that are required to undergo ship inspection, a ship inspection certificate should also be attached. IB-T9746.2-1999
This standard is a revision of ZBU48001-89 "Gray iron castings for marine gearboxes, technical conditions". During the revision, editorial modifications were made to the original standard, and the main technical content has not changed. This standard replaces ZBU48001-89 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Standardization of Internal Combustion Engines. The drafting units of this standard are Shanghai Internal Combustion Engine Research Institute and Hangzhou Qianjin Gearbox Group Co., Ltd. The main drafters of this standard are Li Shaoqiu, Shao Huaxing and Ma Zhenlian. This standard was first issued in 1989.
1 Range
Mechanical Industry Standard of the People's Republic of China
Marine Gearbox
Gray Iron Castings
Technical Conditions
Gray iron castings for marine gearboxesSpecificationsJB/T9746.2-1999
Replaces ZBU48001--89
This standard specifies the material, dimensional tolerance, machining allowance, weight deviation, allowable range of casting defects and corresponding test methods and inspection rules of marine gearbox gray iron castings. This standard is applicable to marine gearbox gray iron castings (hereinafter referred to as castings) cast by sand casting, and gray iron castings cast by other methods can also be used for reference.
2 Cited standards
The clauses contained in the following standards constitute the clauses 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/T223.1223.5—1981~1997 Chemical analysis methods for steel and alloys GB/T231—1984
GB/T2828—1987
GB/T6060.1——1997
GB/T6414—1986
GB/T7216—1987
GB/T9439—1988
JB/T7945—19 99
3 Technical requirements
3.1 Casting material
Metal Brinell hardness test method
Batch inspection counting sampling procedure and sampling table (applicable to continuous batch inspection) Surface roughness comparison sample casting surface
Casting size tolerance
Gray cast iron metallography
Gray cast iron parts
Gray cast iron mechanical properties test method
3.1.1 The grade of gray cast iron shall not be lower than HT150. The selection of gray cast iron grades shall comply with the provisions of GB/T9439. 3.1.2 The mechanical properties of castings are generally based on the mechanical properties of single casting test bars. If it is necessary to use attached casting test bars (blocks) or take samples from the casting itself, the supply and demand parties shall negotiate and agree, and indicate in the product drawings or relevant technical documents: a) The position, shape and size of the attached casting test bars (blocks); b) The sampling position, shape and size of the casting body sample. The mechanical properties of single casting test bars, attached casting test bars (blocks) and castings with different wall thicknesses shall comply with the provisions of GB/T9439. 3.1.3 The chemical composition, metallographic structure and hardness of castings are generally not used as the basis for acceptance. If the purchaser has special requirements for this, the sampling inspection position and the performance indicators to be achieved shall be clearly stated in the product drawings or relevant technical documents. The metallographic structure shall comply with the provisions of GB/T7216; the hardness may be selected from the various hardness grades in accordance with Appendix A of GB/T9439-1988. Approved by the State Bureau of Machinery Industry on September 17, 1999 and implemented on January 1, 2000wwW.bzxz.Net
3.2 Casting dimensional tolerance
JB/T9746.2-1999
3.2.1 The casting dimensional tolerance grade shall comply with the provisions of GB/T6414-1986, and one shall be selected from Table A1 or Table A2 of the standard and marked on the product drawings or relevant technical documents. The wall thickness and rib thickness tolerance may be reduced by one level. 3.2.2 The mismatch (box) value shall be selected and marked in accordance with the provisions of GB/T6414. If necessary, it may also be agreed upon by both the supplier and the buyer. The mismatch (box) value must be included in the casting dimensional tolerance value. 3.3 Casting machining allowance, draft angle, casting machining allowance, draft angle shall be selected according to relevant standards, or determined by negotiation between the supply and demand parties.
Casting geometry deviation
The bending deformation of the casting shall be measured according to the maximum size of the inspected surface. 3.4.1
3.4.2The maximum allowable deformation of the casting on the non-machined surface may be determined by negotiation between the supply and demand parties as needed: The maximum allowable deformation of the casting on the machined surface shall ensure that the machined surface has a machining allowance of not less than 1/3. 3.5 Casting weight deviation
3.5.1 The weight deviation of the casting is generally not used as the basis for acceptance. If the purchaser has requirements for this, it can also be used as an acceptance condition. The maximum allowable deviation is specified in Table 1.
Basic weight of castings
>100~500
>500~1000
Maximum allowable deviation
Castings produced in batches and in large quantities
Note: The table only specifies the upper deviation of the casting weight, and its lower deviation is limited by the lower deviation of the dimensional tolerance. %
Castings produced in single pieces and in small batches
3.5.2 The basic weight of castings can be determined by calculated values or by randomly sampling the measured average value from a batch of qualified castings. Density of gray castings: HT150~HT2007.20kg/dm2; HT250~HT3507.35kg/dm2.
3.6 Surface quality of castings
3.6.1 The casting surface is not allowed to have mold sand, core sand, sticky sand, flying wings, and burrs. 3.6.2
The allowable range of residues on the casting surface shall comply with the provisions of Table 2. Table 2
Gates, wings, air outlets
After cleaning, the value of the root below or above the surface should not exceed 1.5mm, but on the surface where 1 needs to be added:. The depth of the root below the surface should be less than 2/3 of the machining allowance. After grinding, it is allowed to be no higher than 1.5mm above the surface. Defects that do not need to be repaired are allowed on the casting surface: JB/T9746.2-1999
a) Castings are allowed to have defects specified in Table 3 on non-exposed surfaces that are not processed. The parts where defects are not allowed should be indicated in the product drawings or relevant technical documents.
b) Castings are allowed to have the above defects with a maximum size of no more than Φ5mm, a maximum depth of no more than 2mm, and no more than 1 defect within 100mm on the exposed surface that is not processed. c) The above defects within the processing allowance range are allowed on the processed surface of castings. d) Non-important castings or non-important parts of castings are allowed to have the above defects with a size of less than Φ3mm, a distance of no less than 5mm from the edge, a depth of less than 1.5mm after processing, and a total of no more than 3 defects on each processed surface. The parts where defects are not allowed should be indicated in the product drawings or relevant technical documents. ,
Transmission capacity
kW/t/min
>0.03~0.55
Casting category
Maximum defect size
The depth of air holes, shrinkage holes, eye holes and sand holes allowed without machining
is less than 1/4 of the wall thickness
at the defect location, and the maximum does not exceed 2.5
is less than 1/4 of the wall thickness
at the defect location, and the maximum does not exceed 3|| tt||Less than 1/4 of the wall thickness at the defect location, and no more than 4
Distance between defects
Distance between defects and distance from edge
Not less than 5
Distance between defects and distance from edge
Not less than 10
Distance between defects and distance from edge
Not less than 20
Note: Class I refers to important castings and important parts of pins; Class II refers to non-important castings and non-important parts of castings. After sand inclusion defects are trimmed, the wall thickness should be within the dimensional tolerance range. 3.6.4
Defects are not allowed to appear simultaneously in the corresponding parts of the same section of the inner wall and the outer wall of the casting. 3.6.5
Castings are not allowed to have cracks and cold shuts.
No casting defects that affect the machining accuracy are allowed on the initial machining positioning reference surface of the casting. Number of defects
No more than
2 places within 50mm, and no more than 8 places in total
No more than
2 places within Φ50mm, and no more than 10 places in total
No more than
2 places within 70mm, and no more than 12 places in total
Important parts of castings (such as oil channels and parts bearing thrust) are not allowed to shrink. Parts that are allowed to have slight shrinkage should be indicated in the product 3.6.8
drawings or relevant technical documents.
3.6.9No casting defects are allowed in the threaded holes after processing. 3.6.10. The surface roughness R value of castings shall comply with the provisions of GB/T6060.1, and one of the three levels of 12.5, 25, and 50 shall be selected and marked on the product drawings.
3.7 Repair of defects in castings
3.7.1 Defects on the unprocessed exposed surface of castings that exceed the requirements of 3.6.3b) but meet the requirements of Table 3 shall be repaired by appropriate methods.
3.7.2 Defects and locations that are not allowed to be repaired by welding: a) Defects: scattered sand inclusions, shrinkage, etc.; b) Locations: keyway and processed hole surface, friction surface and thrust bearing location. 3.7.3 For defect repair by welding of important castings determined by the ship inspection department, the consent of the ship inspection department shall be obtained. 3.8 Heat treatment of castings
JB/T9746.2-1999
Important castings shall be artificially aged and indicated in product drawings or relevant technical documents. 4 Test methods
4.1 Preparation of test bars (blocks) and test specimens
4.1.1 The preparation of single cast test bars and attached cast test bars (blocks) shall comply with the provisions of GB/T9439. Other types of test bars approved by the ship inspection department may also be used.
Tensile test specimens shall adopt Type A in JB/T7945. 4.1.23
4.1.3 Test bars (blocks) and test specimens shall be clearly marked so that the castings they represent can be identified. 4.2 Tensile test shall comply with the provisions of JB/T7945. Hardness test shall comply with Appendix A of GB/T9439-1988 and GB/T231. 4.3
4.4 Chemical analysis shall comply with the provisions of GB/T223.1~223.5. Metallographic inspection of castings shall comply with the provisions of GB/T7216. 4.5
The casting surface roughness test of castings shall comply with the provisions of GB/T6060.1. .The corresponding casting surface roughness comparison sample is used for evaluation.
5 Inspection rules
5.1 The quality inspection department of the manufacturer shall inspect the mechanical properties, geometric shape, size and surface defects of the castings according to the product drawings or relevant technical documents. The purchaser has the right to conduct random inspection or re-inspection of the castings. 5.2 The appearance quality of the castings shall be inspected 100%. 5.3 In addition to the first piece of castings that must be inspected during each production, the castings produced in continuous batches may be inspected randomly. The number and method of random inspection shall be carried out in accordance with the provisions of GB/T2828. 5.4 For certain important parts determined by the ship inspection department, the surveyor shall inspect and approve them, and mark them with the inspection mark of the ship inspection department. 5.5 Other inspection rules shall comply with the provisions of GB/T9439. 6 Marking and Certificate of Qualification
6.1 Qualified castings shall be accompanied by the marking of the quality inspection department of the manufacturer. 6.2 Castings shall be accompanied by a certificate of qualification when leaving the factory. The following shall be indicated: a) Manufacturer name or code:
b) Part name, drawing number and delivery quantity: c) Casting brand (important castings shall indicate the furnace number, package number and sequence number): d) Chemical composition and mechanical properties test results; e) Other technical content descriptions (such as heat treatment methods, repair methods, etc.). 6.3 For castings that are required to undergo ship inspection, a ship inspection certificate shall also be attached.2-1999
Important castings shall be artificially aged and shall be indicated in product drawings or relevant technical documents. 4 Test methods
4.1 Preparation of test bars (blocks) and test specimens
4.1.1 The preparation of single-cast test bars and attached cast test bars (blocks) shall comply with the provisions of GB/T9439. Other types of test bars approved by the ship inspection department may also be used.
Tensile test specimens shall adopt Type A in JB/T7945. 4.1.23
4.1.3 Test bars (blocks) and test specimens shall be clearly marked so that the castings they represent can be identified. 4.2 Tensile test shall comply with the provisions of JB/T7945. Hardness test shall comply with the provisions of Appendix A of GB/T9439-1988 and GB/T231. 4.3
4.4 Chemical analysis shall comply with the provisions of GB/T223.1~223.5. Metallographic inspection of castings shall comply with the provisions of GB/T7216. 4.5
The casting surface roughness inspection of castings shall comply with the provisions of GB/T6060.1. .The corresponding casting surface roughness comparison sample shall be used for evaluation.
5 Inspection rules
5.1 The quality inspection department of the manufacturer shall inspect the mechanical properties, geometric shape, size and surface defects of the castings according to the product drawings or relevant technical documents. The purchaser has the right to conduct random inspection or re-inspection of the castings. 5.2 The appearance quality of the castings shall be inspected 100%. 5.3 In addition to the first piece of castings that must be inspected during each production, the castings produced in continuous batches may be inspected. The number and method of random inspection shall comply with the provisions of GB/T2828. 5.4 For certain important parts determined by the ship inspection department, the surveyor shall inspect and approve them, and mark them with the inspection mark of the ship inspection department. 5.5 Other inspection rules shall comply with the provisions of GB/T9439. 6 Marking and Certificate of Qualification
6.1 Qualified castings shall be accompanied by the marking of the quality inspection department of the manufacturer. 6.2 Castings shall be accompanied by a certificate of qualification when leaving the factory. The following shall be indicated: a) Manufacturer name or code:
b) Part name, drawing number and delivery quantity: c) Casting brand (important castings shall indicate the furnace number, package number and sequence number): d) Chemical composition and mechanical properties test results; e) Other technical content descriptions (such as heat treatment methods, repair methods, etc.). 6.3 For castings that are required to undergo ship inspection, a ship inspection certificate shall also be attached.2-1999
Important castings shall be artificially aged and shall be indicated in product drawings or relevant technical documents. 4 Test methods
4.1 Preparation of test bars (blocks) and test specimens
4.1.1 The preparation of single-cast test bars and attached cast test bars (blocks) shall comply with the provisions of GB/T9439. Other types of test bars approved by the ship inspection department may also be used.
Tensile test specimens shall adopt Type A in JB/T7945. 4.1.23
4.1.3 Test bars (blocks) and test specimens shall be clearly marked so that the castings they represent can be identified. 4.2 Tensile test shall comply with the provisions of JB/T7945. Hardness test shall comply with the provisions of Appendix A of GB/T9439-1988 and GB/T231. 4.3
4.4 Chemical analysis shall comply with the provisions of GB/T223.1~223.5. Metallographic inspection of castings shall comply with the provisions of GB/T7216. 4.5
The casting surface roughness inspection of castings shall comply with the provisions of GB/T6060.1. .The corresponding casting surface roughness comparison sample shall be used for evaluation.
5 Inspection rules
5.1 The quality inspection department of the manufacturer shall inspect the mechanical properties, geometric shape, size and surface defects of the castings according to the product drawings or relevant technical documents. The purchaser has the right to conduct random inspection or re-inspection of the castings. 5.2 The appearance quality of the castings shall be inspected 100%. 5.3 In addition to the first piece of castings that must be inspected during each production, the castings produced in continuous batches may be inspected. The number and method of random inspection shall comply with the provisions of GB/T2828. 5.4 For certain important parts determined by the ship inspection department, the surveyor shall inspect and approve them, and mark them with the inspection mark of the ship inspection department. 5.5 Other inspection rules shall comply with the provisions of GB/T9439. 6 Marking and Certificate of Qualification
6.1 Qualified castings shall be accompanied by the marking of the quality inspection department of the manufacturer. 6.2 Castings shall be accompanied by a certificate of qualification when leaving the factory. The following shall be indicated: a) Manufacturer name or code:
b) Part name, drawing number and delivery quantity: c) Casting brand (important castings shall indicate the furnace number, package number and sequence number): d) Chemical composition and mechanical properties test results; e) Other technical content descriptions (such as heat treatment methods, repair methods, etc.). 6.3 For castings that are required to undergo ship inspection, a ship inspection certificate shall also be attached.
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