Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard was drafted according to the rules given in GB/T 1.1-2009.
This standard was proposed by China National Light Industry Council.
This standard is under the jurisdiction of the National Technical Committee 160 on Horology of Standardization Administration of China (SAC/TC 160).
Finishing Requirements for Parts and Assemblies of the Mechanical Watch Movements
1 Scope
This standard specifies the requirements and inspection methods for the finishing of parts and assemblies of the mechanical watch movements.
This standard is applicable to the parts and assemblies of mechanical watches (hereinafter referred to as "parts and assemblies") that have undergone finishing processing.
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 10610 Geometrical product specifications(GPS) - Surface texture: Profile method - Rules and procedures for the assessment of surface texture
3 Requirements
3.1 Surface Quality Requirements for Metal Parts and Assemblies
Metal parts and assemblies shall be free from surface defects, such as indentations, pits, scratches, burning marks, local highlights after polishing, spots after electroplating and blistering. The surface colors of all parts and assemblies shall be uniform and coordinated.
3.2 Finishing Requirements for Metal Parts and Assemblies
3.2.1 General Provisions
Mirror polishing of metal parts and assemblies finishing refers to that the Ra value of surface roughness shall not be greater than 0.05μm; polishing refers to that the Ra value of surface roughness shall not be greater than 0.2μm.
As long as the finishing meets the surface roughness requirements, there is no limit to the machining method.
3.2.2 Gear parts
3.2.2.1 The roughness Ra value of the gear tooth shall not be greater than 0.4μm, and the tooth working face of the gear shall be mirror polished.
3.2.2.2 There shall be no sharp points between the outer edge of gear teeth and the plane.
3.2.2.3 The upper and lower surfaces of the gear shall be free from irregular machining lines and be polished.
3.2.2.4 The roughness Ra value of the lower surface of the strip box gear and the upper surface of the strip box cover shall not be greater than 0.4μm, and grinding and sandblasting, etc. are allowed.
3.2.3 Parts of Speed Regulating System
3.2.3.1 The tooth-shaped impact surface of the escapement gear shall be mirror polished and the locking surface shall be polished.
3.2.3.2 The roughness Ra value of the escapement fork mouth and fork head nail working face shall not be greater than 0.4μm.
3.2.3.3 The upper and lower planes of the escapement fork shall be free from irregular machining lines and be polished.
3.2.3.4 The upper plane of the balance wheel shall be polished; the inner circle of the upper plane shall be chamfered and polished; the spokes shall be free from irregular machining lines.
3.2.3.5 The exposed surface of the weight or screw cap of the weight balance wheel shall be polished.
3.2.3.6 The upper and lower planes of the movable outer pile ring and fast & slow needles shall be polished.
3.2.4 Parts of upper dial pin system
The surface of non-gear parts shall be flat, and the upper plane shall be polished.
3.2.5 Parts of splint system
3.2.5.1 The surface of splint shall be flat.; the exposed plane, the outer side of the splint, the inner groove and other surfaces shall be free from irregular machining lines. The exposed edges of all splints shall be chamfered and polished.
3.2.5.2 All splints shall be coordinated and have uniform surface texture.
3.2.5.3 Splint gem holes should be chamfered and polished.
3.2.6 Parts of automatic system
3.2.6.1 The gear and splint parts in automatic system shall meet the requirements in 3.2.2 and 3.2.5 respectively.
Foreword I
1 Scope
2 Normative References
3 Requirements
4 Test Methods
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard was drafted according to the rules given in GB/T 1.1-2009.
This standard was proposed by China National Light Industry Council.
This standard is under the jurisdiction of the National Technical Committee 160 on Horology of Standardization Administration of China (SAC/TC 160).
Finishing Requirements for Parts and Assemblies of the Mechanical Watch Movements
1 Scope
This standard specifies the requirements and inspection methods for the finishing of parts and assemblies of the mechanical watch movements.
This standard is applicable to the parts and assemblies of mechanical watches (hereinafter referred to as "parts and assemblies") that have undergone finishing processing.
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 10610 Geometrical product specifications(GPS) - Surface texture: Profile method - Rules and procedures for the assessment of surface texture
3 Requirements
3.1 Surface Quality Requirements for Metal Parts and Assemblies
Metal parts and assemblies shall be free from surface defects, such as indentations, pits, scratches, burning marks, local highlights after polishing, spots after electroplating and blistering. The surface colors of all parts and assemblies shall be uniform and coordinated.
3.2 Finishing Requirements for Metal Parts and Assemblies
3.2.1 General Provisions
Mirror polishing of metal parts and assemblies finishing refers to that the Ra value of surface roughness shall not be greater than 0.05μm; polishing refers to that the Ra value of surface roughness shall not be greater than 0.2μm.
As long as the finishing meets the surface roughness requirements, there is no limit to the machining method.
3.2.2 Gear parts
3.2.2.1 The roughness Ra value of the gear tooth shall not be greater than 0.4μm, and the tooth working face of the gear shall be mirror polished.
3.2.2.2 There shall be no sharp points between the outer edge of gear teeth and the plane.
3.2.2.3 The upper and lower surfaces of the gear shall be free from irregular machining lines and be polished.
3.2.2.4 The roughness Ra value of the lower surface of the strip box gear and the upper surface of the strip box cover shall not be greater than 0.4μm, and grinding and sandblasting, etc. are allowed.
3.2.3 Parts of Speed Regulating System
3.2.3.1 The tooth-shaped impact surface of the escapement gear shall be mirror polished and the locking surface shall be polished.
3.2.3.2 The roughness Ra value of the escapement fork mouth and fork head nail working face shall not be greater than 0.4μm.
3.2.3.3 The upper and lower planes of the escapement fork shall be free from irregular machining lines and be polished.
3.2.3.4 The upper plane of the balance wheel shall be polished; the inner circle of the upper plane shall be chamfered and polished; the spokes shall be free from irregular machining lines.
3.2.3.5 The exposed surface of the weight or screw cap of the weight balance wheel shall be polished.
3.2.3.6 The upper and lower planes of the movable outer pile ring and fast & slow needles shall be polished.
3.2.4 Parts of upper dial pin system
The surface of non-gear parts shall be flat, and the upper plane shall be polished.
3.2.5 Parts of splint system
3.2.5.1 The surface of splint shall be flat.; the exposed plane, the outer side of the splint, the inner groove and other surfaces shall be free from irregular machining lines. The exposed edges of all splints shall be chamfered and polished.
3.2.5.2 All splints shall be coordinated and have uniform surface texture.
3.2.5.3 Splint gem holes should be chamfered and polished.
3.2.6 Parts of automatic system
3.2.6.1 The gear and splint parts in automatic system shall meet the requirements in 3.2.2 and 3.2.5 respectively.
Contents of GB/T 38023-2019
Foreword I
1 Scope
2 Normative References
3 Requirements
4 Test Methods
