National standard for aluminum alloy die castings

Aluminum alloy die casting standard 1 People's Republic of China national standard
Aluminum alloy die casting GB/T 15114-94

1,the subject content and scope of application
This standard specifies the technical requirements, quality assurance, test methods, inspection rules and delivery conditions of aluminum alloy die castings

2. citation criteria
GB1182 shape and position tolerance codes and their standards
GB2829 cycle checks, counting, sampling procedures, and sampling tables (for inspection of stability in the manufacturing process)
GB6060.1 surface roughness; comparison specimen; casting surface
GB6060.4 surface roughness; sample block; polished surface
GB6060.5 surface roughness was compared with sample cast (shot) pellets and sand blasted surfaces
GB6414 dimensional tolerances for Castings
GB/T11350 machining allowance for Castings
GB/T15115 die cast aluminum alloy

3. technical requirements
3.1 chemical composition
3.2 mechanical properties
3.2.1 when using the die casting sample test, the mechanical properties should comply with the provisions of GB/T15115
3.2.2 when using the die casting body test, the mechanical properties of the cutting parts of the specified part shall not be less than 75% of the single casting sample. If there are special requirements, the two sides can agree on the mechanical properties of the sample
3.3 die casting size
3.3.1 die castings shall comply with the requirements of the casting drawings
3.3.2 The dimensional tolerances of die castings shall be carried out in accordance with the provisions of GB6414, and shall be marked on the drawings when special requirements and requirements are given
3.3.3 press casting meets the physical tolerance requirements, the marking method shall be specified in accordance with GB1182
3.3.4 die castings do not include the casting slope and its non machined surface: the inclusion surface shall be based on the small end and shall be specified on the drawings when specified and required

3.4 when the die casting needs machining, its machining allowance shall be carried out according to the provisions of GB/T11350. If there are special requirements and requirements, the amount of processing shall be indicated on the drawings

3.5 surface quality
3.5.1 casting surface roughness shall comply with the requirements of GB6060.1
3.5.2 castings are free of cracks, castings, porosity, bubbles, and any penetration defects
3.5.3 castings shall not be subject to scratches, depressions, defects in meat or web, isosceles triangle defects, but the extent and quantity of defects shall be in line with the standards agreed upon by both the buyer and the supplier
3.5.4 castings shall be clean, but allow traces of gate, flash, overflow, skin, and pin traces
3.5.5 If the drawings are not specified, the setting of the die casting process, such as the location of the top, the location of parting lines, the location of the gate and overflow port, shall be specified by the manufacturer. Otherwise, the drawings shall be indicated or agreed upon by both the suppliers and the buyers
3.5.6 die castings require special machined surfaces, such as polishing, shot peening, chrome plating, coating, anodizing, chemical oxidation, etc., shall be indicated on the drawings or agreed upon by both the supplier and the buyer

3.6 internal quality
3.6.1 If the die casting can meet the requirements of its use, the essential defects of the die castings shall not be used as the basis for discarding the die
3.6.2 the pressure, tightness, hydraulic sealing, heat treatment, high temperature coating, internal defects (porosity, porosity, cold separation, inclusion) and the requirements of this standard for the casting shall be agreed upon by both the supplier and the supplier
3.6.3 does not affect the use of die-casting parts, with the consent of the buyer, the supplier can do the infiltration and repair of the casting (such as welding, deformation, finishing, etc.) processing

4 quality assurance

4.1 the supplier shall be responsible for all the tests or tests stipulated in the contract when the provisions of the contract or agreement between the supplier and the buyer are provided
For the tests and requirements specified in this standard, the buyer shall have the right to inspect any test and inspection items in the standard, and the quality assurance standards shall be determined according to the agreement between the supply and demand parties

4.2 according to the characteristics of die casting, a test lot shall mean any significant changes in the output, equipment, chemical composition, mold and operation continuity of each shift equipment under normal operating conditions
Should be considered new, is a batch start
The supplier shall make random or statistical sampling inspection of each batch of castings to determine whether they meet all technical requirements and requirements of the contract or casting drawings, and the inspection results shall be recorded

5 test methods and inspection rules
5.1 chemical composition
5.11The test methods, inspection rules and re examination of the chemical composition of the alloy shall comply with the provisions of GB/T15115
5.12Specimens of chemical composition are also desirable for self pressing castings, but must comply with the requirements of the GB/T15115
5.2 mechanical properties
5.2.1 test methods for mechanical properties, inspection frequency and inspection rules comply with the provisions of GB/T15115
5.2.2 adopts the die casting body as the sample and the size of the cutting part, and the test form shall be agreed upon by both the supplier and the buyer

5.3 casting geometry inspection according to inspection batch tests or by GB2828, the provisions of GB2829, sampling results must meet the standards specified in 3.3.

5.4 the surface quality of the die castings shall be checked and checked and the inspection result shall be up to 3.5 of this standard

5.5 the surface roughness of die castings shall be carried out according to the provisions of GB6060.1

5.6 the surface of the pressing parts should be polished and machined according to the regulations of GB6060.4,

5.7 die castings shall be shot peening and sandblasting shall be performed as specified by GB6060.5

5.8 test method for internal quality of die castings. The inspection rules shall be agreed upon by both supply and demand parties, and may include: X ray photographs, nondestructive testing, pressure test, metallographic drawings and die casting profiles, etc. the inspection results shall be in accordance with 3.6
Regulations.

5.9 the quality of the die castings after infiltration and patching shall be checked accordingly

6 delivery, packaging, transportation and storage of die castings
6.1 when required in the contract or agreement, the supplier shall provide the buyer with a certificate of inspection indicating the standards for the sampling, testing and inspection of each batch of die castings
6.2 when qualified die castings are delivered, they must be accompanied by a certificate of inspection. The following contents shall be clearly stated: product name, product number, alloy grade, quantity, delivery state, manufacturer name, inspection mark and delivery time
The special inspection items shall indicate the inspection conditions and results on the inspector's certificate of quality
6.3 the packing, transportation and storage of die castings shall be agreed upon by both suppliers and suppliers