Some standard content:
National Standard of the People's Republic of China
Aluminum alloy die-castings
Aluminum alloy die-castings1 Subject content and scope of application
GB/T 15114--94
This standard specifies the technical requirements, quality assurance, test methods, inspection rules and delivery conditions of aluminum alloy die-castings. This standard applies to aluminum alloy die-castings.
2 Reference standards
GB1182 Shape and position tolerance codes and their markings GB2828 Batch inspection counting sampling procedures and sampling tables (applicable to inspection of continuous batches) GB2829 Periodic inspection counting sampling procedures and sampling tables (applicable to inspection of production process stability) GB6060.1 Surface roughness comparison specimen casting surface GB6060.4 Surface roughness comparison specimen polishing surface GB6060.5 Surface roughness comparison specimen shot blasting, sand blasting surface GB6414 Dimensional tolerances of castings
GB/T11350 Machining allowance of castings
GB/T15115 Die-casting aluminium alloy
3 Technical requirements
3.1 Chemical composition
The chemical composition of the alloy shall comply with the provisions of GB/T15115. 3.2 Mechanical properties
3.2.1 When die-casting specimens are used for inspection, their mechanical properties shall comply with the provisions of GB/T15115. 3.2.2 When the die-casting body is used for inspection, the mechanical properties of the specimens cut from the designated parts shall not be lower than 75% of the single-cast specimens. If there are special requirements, they can be agreed upon by the supply and demand parties.
3.3 Die-casting dimensions
3.3.1 The geometric shape and dimensions of die-castings shall comply with the provisions of the casting drawings. 3.3.2 The dimensional tolerances of die-castings shall be implemented in accordance with the provisions of GB6414. When there are special provisions and requirements, they must be indicated on the drawings. 3.3.3 When there are requirements for form and position tolerances for die-castings, refer to Appendix A (reference parts); the marking method shall be in accordance with the provisions of GB1182. 3.3.4 The dimensional tolerance of die castings does not include casting slope. For the unprocessed surface: the containing surface is based on the small end, and the contained surface is based on the large end; for the surface to be processed: the containing surface is based on the large end, and the contained surface is based on the small end. If there are special regulations and requirements, they must be indicated on the drawing. 3.4 When die castings need to be machined, the machining allowance shall be implemented in accordance with the provisions of GB/T11350. If there are special regulations and requirements, the machining allowance shall be indicated on the drawing.
3.5 Surface quality
3.5.1 The surface roughness of the casting shall comply with the provisions of GB6060.1. Approved by the State Bureau of Technical Supervision on July 20, 1994, and implemented on July 1, 1995
GB/T 15114-94
3.5.2 Castings are not allowed to have cracks, undercasting, looseness, bubbles and any penetrating defects. 3.5.3 Castings are allowed to have defects such as scratches, dents, lack of meat and mesh burrs. However, the degree and quantity of defects should be consistent with the standards agreed upon by both parties.
3.5.4 The gates, flash, overflows, skins, and ejector marks of castings should be cleaned. However, traces are allowed. 3.5.5 If there are no special provisions in the drawings, the settings of the die-casting process, such as the position of the ejector, the position of the parting line, the position of the gate and the overflow, etc., shall be determined by the manufacturer. Otherwise, they shall be indicated on the drawings or agreed upon by both parties. 3.5.6 Surfaces of die castings that require special processing, such as polishing, shot peening, chrome plating, coating, anodizing, chemical oxidation, etc., must be indicated on the drawings or agreed upon by both parties.
3.6 Internal Quality
3.6.1 If the die castings can meet their use requirements, the intrinsic defects of the die castings shall not be used as the basis for scrapping. 3.6.2 When there are requirements for the air pressure tightness, hydraulic tightness, heat treatment, high temperature coating, internal defects (pores, sparse holes, cold shuts, inclusions) of the die castings and items not listed in this standard, they can be agreed upon by both parties. 3.6.3 Under the condition that it does not affect the use of the die castings, the supplier can carry out infiltration and repair (such as welding repair, deformation correction, etc.) of the die castings with the consent of the buyer.
4 Quality Assurance
4.1 When there are provisions in the contract or agreement between the supplier and the buyer, the supplier is responsible for all tests and inspections specified in the contract. If there is no stipulation in the contract or agreement, the supplier may, with the consent of the purchaser, use its own appropriate means to implement the tests and requirements specified in this standard. The purchaser has the right to inspect any test and inspection items in the standard, and its quality assurance standard shall be determined according to the agreement between the supplier and the purchaser. 4.2 According to the characteristics of die-casting production, a specified inspection batch refers to the production volume of each die-casting equipment in one shift under normal operation. Any major changes in equipment, chemical composition, casting mold and operation continuity shall be considered as the beginning of a new batch. The supplier shall randomly or statistically sample each batch of die-castings to determine whether it meets all technical requirements and the requirements specified in the contract or casting drawings. The inspection results shall be recorded. 5 Test methods and inspection rules
5.1 Chemical composition
5.1.1 The inspection method, inspection rules and re-inspection of the chemical composition of the alloy shall comply with the provisions of GB/T15115. 5.1.2 The chemical composition samples can also be taken from the die-castings, but they must comply with the provisions of GB/T15115. 5.2 Mechanical properties
5.2.1 The inspection method, inspection frequency and inspection rules of mechanical properties shall comply with the provisions of GB/T15115. 5.2.2 When the die casting body is used as the test specimen, the size of the cut part and the test form shall be agreed upon by the supply and demand parties. 5.3 The inspection of the geometric dimensions of die castings can be carried out by sampling according to the inspection batch or according to the provisions of GB2828 and GB2829. The sampling results must comply with the provisions of 3.3 of this standard.
5.4 The surface quality of die castings shall be checked piece by piece, and the sampling results shall comply with the provisions of 3.5 of this standard. 5.5 The surface roughness of die castings shall be implemented in accordance with the provisions of GB6060.1. 5.6 The surface of die castings that need to be polished shall be implemented in accordance with the provisions of GB6060.4. The surface of die castings that need to be shot peened and sand blasted shall be implemented in accordance with the provisions of GB6060.5. 5.7
5.8 The test method and inspection rules for the internal quality of die castings shall be agreed upon by the supply and demand parties. It may include: X-ray photos, non-destructive testing, pressure resistance tests, metallographic pictures and die casting cross-sections, etc. The inspection results shall comply with the provisions of 3.6. 5.9 Die castings after infiltration and repair treatment shall be subject to corresponding quality inspection. Delivery, packaging, transportation and storage of die castings 6
6.1 When required in the contract or agreement, the supplier shall provide the purchaser with an inspection certificate to illustrate that the sampling, testing and 408
GB/T15114--94
inspection of each batch of die castings comply with the regulations of this standard.
6.2 When qualified die castings are delivered, an inspection certificate must be attached. The following contents shall be stated on it: product name, product number, alloy grade, quantity, delivery status, manufacturer name. Inspection pass mark and delivery time. If there are special inspection items, the inspection conditions and results shall be indicated on the inspection certificate.
6.3 The packaging, transportation and storage of die castings shall be agreed upon by the supplier and the buyer. Shape tolerance
GB/T 15114--94
Appendix A
Shape and position tolerance of die castings
(reference part)
The surface shape tolerance value of die castings (except flatness and draft angle) shall be within the relevant dimension tolerance range. Table A1 Flatness tolerance
Size of measured part
～~25
>25～63
≥63~100
>100～160
>160～250
≥250～400
400630
A2 Position tolerance
Size of measured part
in measuring direction
>25～63
63~ 100
100~160
>160～250
250～400
>400~630
Parallelism, perpendicularity, end face runout toleranceIn half mold
The measured part and the reference part are in the same
Part
Neither is stationary
In one part
One part moves
Two parts
Both are moving
After shaping
Measured The part and the reference part are not in the middle half mold. Both parts
are stationary
Of the two parts
, one is moving
One part
is moving
The size of the measured part
in the measuring direction
30～50
>50～120
>120～250
>250~500
>500～800
GB/T 15114—94
Table A3 Coaxiality and symmetry tolerance
Measured part and reference part in the same half mold Two partswww.bzxz.net
Both are stationary
One of the two parts is moving
Both parts
are moving
Note: Table A2 and Table A3 do not include the position tolerance of the parts related to the die casting and the insert. Additional remarks:
This standard is proposed by the Aviation Industry Corporation of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Foundry Standardization. Difference
The measured part and the reference part are not in the same
half mold
All three parts
are stationary
One of the two parts
is moving
Both parts
are moving
This standard was drafted by Shenyang Foundry Research Institute of the Ministry of Machinery Industry, Baocheng General Electronics Company of Aviation Industry Corporation, and China Dongfeng Motor Corporation.
The main drafters of this standard are Kuang Yunlie, Long Ping, Cheng Zhichao, Yuan Chengqi, and Jia Shuqin. 1
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