GB/T 37057-2019 PDF in English
GB/T 37057-2019 (GB/T37057-2019, GBT 37057-2019, GBT37057-2019)
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Multi-way precision die forgings -- Quality control criterion
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GB/T 37057-2019: PDF in English (GBT 37057-2019) GB/T 37057-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.85
J 32
Multi-way precision die forgings –
Quality control criterion
ISSUED ON: MARCH 25, 2019
IMPLEMENTED ON: OCTOBER 01, 2019
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Main control points and requirements ... 4
Multi-way precision die forgings –
Quality control criterion
1 Scope
This Standard specifies the main control points and requirements for the
production process of multi-way precision die forgings (hereinafter referred to
as "forgings"), including process design, raw materials, blanking, molds, forging
equipment, forging, safety and environmental protection.
This Standard applies to the quality control of multi-way precision die forgings.
2 Normative references
The following documents are indispensable for the application of this document.
For dated references, only the dated version applies to this document. For
undated references, the latest edition (including all amendments) applies to this
document.
GB/T 8541, Terminology of forging and stamping
GB 13318, General rules for safety and environmental conservation of
forging production
GB/T 33879, Mufti-way precision die forgings. General specification
GB/T 35079, Mufti-way precision die forgings. Technological design principle
JB/T 4318.2, Horizontal band sawing machine. Part 2: Testing of the
accuracy
3 Terms and definitions
Terms and definitions determined by GB/T 8541 are applicable to this document.
4 Main control points and requirements
4.1 Process design
4.1.1 Multi-way die forging technology is generally applied to forge complex
structural forgings which have inner holes and multiple branches or bosses
externally.
4.1.2 Forging design shall minimize the surface machining allowance on the
premise of satisfying the structural dimensions and mechanical properties of
the part. The final forming part and cavity of the forging shall retain sufficient
process margin; if necessary, the demander’s opinion shall be asked for the
design result.
4.1.3 The process design process shall comply with the requirements that are
specified in GB/T 35079; process specification (card) shall be prepared to guide
the production process. The process specification (card) shall include at least
the requirements and control methods for the processes such as cutting,
heating, mold, forging, multi-way die-forging hydraulic machine control
parameters, post-forging treatment.
4.1.4 For the process design process, numerical simulation technology should
be used to optimize the process and process parameters. The forging steps
should meet the requirements that are specified in GB/T 35079.
4.1.5 Each stage of the process design shall be reviewed; the design results
shall also be reviewed by professionals of design, process, quality, and
production; if necessary, demander’s opinion shall be asked for the design
result.
4.2 Raw material
4.2.1 The raw materials shall have valid quality certification documents that are
provided by the manufacturer; the chemical composition, appearance, size,
mechanical properties and internal quality of the raw materials shall comply with
the process requirements.
4.2.2 The raw materials shall be free of defects such as cracks, crusting, folding
or inclusion on the surface.
4.2.3 After the raw materials are delivered to the factory, they shall be re-
inspected by the quality inspection department. The items and requirements for
re-inspection shall be implemented in accordance with GB/T 33879.
4.2.4 The raw materials shall be stored in sections according to materials,
specifications, inspection status, and clearly marked. Materials and furnace
batches shall be confirmed before the raw materials are shipped out, so as to
prevent mixing.
4.3 Blanking
4.3.1 The raw materials should be sawed and blanked; the blanking shall meet
the requirements of GB/T 35079. The precision of the sawing equipment shall
meet the requirements of JB/T 4318.2.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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