GB/T 45361-2025 Light industry machinery―Specifications for extrusion die English, Anglais, Englisch, Inglés, えいご
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ICS 25.120.30
CCS J 46
National Standards of the People's Republic of China
GB/T 45361-2025
Light industry machinery - Specifications for extrusion die
轻工机械 挤出平模头技术条件
(English Translation)
Issue date: 2025-02-28 Implementation date: 2025-09-01
Issued by the State Administration for Market Regulation
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Structure
5 Technical requirements
6 Test method
7 Inspection rules
8 Marking, packaging, transportation and storage
Light industry machinery - Specifications for extrusion die
1 Scope
This document defines the terms and definitions related to extrusion flat die, specifies the requirements for structure, materials and accessories, processing, parts, assembly, electric heating device, appearance quality, inspection rules, marking, packaging, transportation and storage, and describes the corresponding test methods.
This document is applicable to the production, inspection, sales and acceptance of extrusion flat dies with lip clearance of 0.1 mm~100mm for the production of plastic products such as films, sheets and plates.
2 Normative references
The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, for the referenced document with a date, only the version corresponding to that date is applicable to this document; The latest version of the undated referenced document (including all amendments) is applicable to this document.
GB/T 70.1 Hex socket head screw
GB/T 191 Packaging, storage and transportation graphic signs
GB/T 196 Basic dimensions of common threads
GB/T 197-2018 Ordinary thread tolerance
GB/T 230.1 Rockwell hardness test of metallic materials - Part 1: Test Method
GB/T 825 Eye screw
GB/T 1184-1996 Shape and Position Tolerances Unnoted Tolerance Values
GB/T 1299 Tool steel
GB/T 1804-2000 General tolerances Tolerances for linear and angular dimensions without tolerances
GB/T 1958-2017 Product Geometry Technical Specification (GPS) Geometric Tolerance Testing and Verification
GB/T 4169 (all parts) Plastic injection mold parts
GB/T 4340.1 Vickers hardness test of metallic materials - Part 1: Test Method
GB/T 4956 Non-magnetic coating layer on magnetic substrate-measurement of coating thickness-magnetic method
GB/T 5226.1-2019 Machinery and electrical safety-Machinery and electrical equipment - Part 1: General technical specification
GB/T 6402 Ultrasonic testing method of steel forgings
GB/T 10610 Product Geometry Technical Specification (GPS) Surface Structure Profile Method Rules and Methods for Evaluating Surface Structure
GB/T 13306 placard
GB/T 13384 General technical specification for packaging of mechanical and electrical products
GB/T 35840.4 Plastic mold steels - Part 4: Prehardened steel plate
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
extrusion die
Flat slit extrusion die
Flat-slit head
extrusion die with parallel slot shape characteristics in cross-section of forming section
3.2
die body
main body parts that make up the extrusion flat die
Note: The mold phantom usually consists of an upper mold phantom and a lower mold phantom.
3.3
upper die body
on the adjustment side, the die body is equipped with the micro adjustment structure of the die lip clearance
3.4
lower die body
non-adjustment side, integral or equipped with detachable die lip, die body equipped with preliminary adjustment structure of die lip clearance
3.5
die lip
die body of the outlet part of the flat die is extruded
Note: This part can be either the front part of the integral mold or a separate part.
3.6
die lip gap
Die lip opening clearance
outlet gap formed after the upper mould body and the lower mould body are combined and installed
3.7
sharp edges of the die lip
vertical edge and angle formed at the junction of the working plane and the non-working plane of the lip outlet of the upper die body and the lower die body
3.8
fine-adjusting structure
micro adjustment structure for adjusting the opening gap of the die lip
4 Structure
Extrusion flat die usually consists of upper die body, lower die body, fine-tuning structure, heating electrical structure, side sealing plate, etc., as shown in Figure 1.
5 Technical requirements
5.1 General requirements
Flat extrusion dies shall be manufactured according to the drawings and technical documents approved by the prescribed procedures.
5.2 Materials and accessories
5.2.1 The steel selected for extrusion flat die should not have cracks, trachoma and other defects. Tool and die steel should comply with the provisions of GB/T 1299, and pre-hardened steel plates should comply with the provisions of GB/T 35840.4.
5.2.2 The raw materials and accessories selected for extrusion flat die shall have quality certificates.
5.2.3 The screws used to connect the mold phantom shall adopt Grade 12.9 high-strength screws specified in GB/T 70.1.
5.2.4 The temperature resistance of high-temperature resistant wires should not be lower than 500℃.
5.2.5 The external connector of the extrusion flat die should adapt to the ambient temperature of-40℃~200℃.
5.2.6 Before processing the steel of the mold body, ultrasonic testing should be carried out according to GB/T 6402, and there should be no defects such as white spots, slag inclusions, delamination, internal cracks, and shrinkage holes inside it.
5.2.7 The steel used for the mold phantom should be quenched and tempered, and the 0Cr17Ni4Cu4Nb mold steel should be solution treated.
5.2.8 The load per unit area of the heating rod should be 8W/cm2~12W/cm2, and the temperature resistance should not be lower than 400°C; the load per unit area of the cast aluminum heating plate shall be 2W/cm2~2.8 W/cm2, and the temperature resistance should not be lower than 300°C; the load per unit area of the cast copper heating plate should be 4W/cm2~5W/cm2, and the temperature resistance should not be lower than 500°C.
5.2.9 Eye screws shall comply with the provisions of GB/T 825.
