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GB/T 35977-2018 English PDF (GBT35977-2018)

GB/T 35977-2018 English PDF (GBT35977-2018)

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GB/T 35977-2018: Remanufacturing -- Technical specifications for surface repair of mechanical products

This Standard specifies classification, design and selection principles, requirements for surface repair technology for remanufacturing of mechanical product. This Standard is applicable to design and selection of materials, techniques and processes.
GB/T 35977-2018
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 25.220.01
J 04
Remanufacturing - Technical specifications for
surface repair of mechanical products
ISSUED ON. FEBRUARY 06, 2018
IMPLEMENTED ON. SEPTEMBER 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
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 Classification of surface repair technology ... 5
5 Design and selection principles ... 5
6 Requirements ... 6
7 Common surface repair technology for remanufacturing ... 7
8 Principle of blank surface repair technology for remanufacturing with different failure modes ... 7
Annex A (informative) Common surface repair technology for remanufacturing ... 8
Annex B (informative) Principles of blank surface repair technology for remanufacturing with different failure modes ... 11
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard was proposed by and shall be under the jurisdiction of National Technical Committee on Green Manufacturing Technology of Standardization Administration of China (SAC/TC 337).
The drafting organizations of this Standard. Shandong Energy Heavy
Equipment Manufacturing Group Co., Ltd., National Defense Science and
Technology Key Laboratory of Equipment Remanufacturing Technology, Beijing Ruiman Technology Co., Ltd., China National Heavy Duty Truck Group Jinan Fuqiang Power Co., Ltd., China Machine Productivity Promotion Center, Heibei Beijing-Tianjin-Hebei Remanufacturing Industry Technology Research Co., Ltd., Hefei University of Technology, National Engineering Research Center for Remanufacturing of Mechanical Products, Hebei Ruizhao Laser
Remanufacturing Technology Co., Ltd., Taier Heavy Industry Co., Ltd.,
Guangzhou Huadu Global Automatic Transmission Co., Ltd., The People's
Liberation Army 5719 Factory.
Main drafters of this Standard. Yang Qingdong, Zhang Wei, Yu Helong, Xu Binshi, Shi Peijing, Zhou Xinyuan, Li Enzhong, Luo Jianming, Zheng Handong, Wang Wenyu, Sang Fan, Sun Tingting, Liu Bohai, Chen Yongxiong, Han
Hongshne, Li Kai, Hu Zhenfeng, Cheng Bayi, Huang Dongbao, Huang Zhiyong, Hou Tinghong, Zhao Yang.
Remanufacturing - Technical specifications for
surface repair of mechanical products
1 Scope
This Standard specifies classification, design and selection principles, requirements for surface repair technology for remanufacturing of mechanical product.
This Standard is applicable to design and selection of materials, techniques and processes.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 28619, Remanufacturing - Terminology
GB/T 31208, The methods of quality evaluation for remanufacturing core
GB/T 32809, Remanufacturing - Technological specifications of cleaning for mechanical products
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 28619 as well as the followings apply.
3.1 surface repair technology for remanufacturing of mechanical products a series of surface engineering techniques (including additive manufacturing techniques) involved in the surface repair of remanufactured blanks to restore the remanufactured mechanical products to the geometrical parameters and performance of the prototype new product
3.2 surface damage repair
repair of damage on the order of micrometers to millimeters
consumption and environmental pollution when selecting surface repair
techniques. In the process design and material selection, it is necessary to create conditions for the remanufacturing, recycling or extending service life of mechanical products.
6 Requirements
6.1 General requirements
6.1.1 Environmentally-friendly processes, equipment, materials and methods shall be preferred for surface repair technology for remanufacturing of mechanical products.
6.1.2 The remanufactured mechanical products after repair shall not be lower than the dimensional accuracy, technical parameters, quality characteristics and safety performance requirements of the prototype new products.
6.2 Requirements before repair
6.2.1 Remanufacturing surface repair design and demonstration shall be
carried out according to the service conditions, failure modes and functional requirements of mechanical products. Make comprehensive consideration of technical, environmental and economic feasibility. Determine repair solutions and processes. And develop a guide on repair work. Determine the type,
composition, structure and related physical and chemical properties and mechanical properties of the surface repair layer.
6.2.2 The remanufactured blanks shall be cleaned, tested and correspondingly pretreated and surface protected according to the surface finish conditions of the surface repair technology. Cleaning shall comply with the provisions of GB/T 32809, testing shall meet the requirements of GB/T 31208.
6.3 Repair process requirements
6.3.1 Prioritize automated surface engineering for remanufacturing surface repair. And strictly in accordance with the process flow, the processing and preparation of the remanufactured blank surface repair layer shall be performed. 6.3.2 According to the repair technical requirements, take necessary cooling, gas protection and other protective measures to prevent oxidation, cracking and shedding of the surface repair layer of the blank, and avoid deformation and damage of the blank.
6.3.3 The surface repair site shall be equipped with necessary noise reduction, dustproof, ventilation, anti-seepage and other facilities. The operator shall carry out the necessary labor protection. All kinds of waste generated during the Annex A
(informative)
Common surface repair technology for remanufacturing
Table A.1 gives common surface repair technology for remanufacturing.
Table A.1 -- Common surface repair technology for remanufacturing
No. Name Basic principle Technical features
Applicable
remanufactured
blank
Laser
cladding
technology
With a high-energy-density
laser beam as a heat
source, use a filler such as
synchronous powder
feeding or powdering to add
a cladding material to the
damaged portion of the
surface of the
remanufactured blank. After
laser irradiation, it is melted
simultaneously with a thin
layer on the surface of the
substrate, and rapidly
solidified to form a repair
layer.
The repair layer
and the
substrate are
metallurgically
bonded, the
surface
roughness is
large, the
dilution rate is
low, and the
heat impact on
the substrate is
small.
Suitable for
remanufacturing
of important parts
with complex
structural shapes
and high joint
strength
requirements. Can
be used for
surface damage
repair as well as
for volume
damage repair.
Plasma
cladding
technology
Using a plasma arc as a
heat source, a filler material
is added by means of
simultaneous powder
feeding or powdering to add
a cladding material to the
damaged portion of the
surface of the
remanufactured blank. It is
heated by plasma arc to
melt it simultaneously with
the thin layer on the surface
of the substrate.
And quickly form a repair
layer.
The repair layer
and the
substrate are
metallurgically
bonded, the
surface
roughness is
large, the
dilution rate is
low, the heat of
the substrate is
less affected,
and the
deposition
efficiency is
higher.
Suitable for
remanufacturing
of important parts
with complex
structural shapes
and high joint
strength
requirements. Can
be used for
surface damage
repair as well as
for volume
damage repair.

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