This part specifies the dimensions and tolerances of circular inserts for die casting moulds. This part is applicable to circular inserts for die casting moulds. This part also gives material guidelines and hardness requirements, and specifies the marking of circular inserts. GB/T 4678.2-2003 Die casting mould parts Part 2: Circular inserts GB/T4678.2-2003 Standard download decompression password: www.bzxz.net

GB/T 4678.2—2003
GB/T4678 "Die Casting Die Parts" is divided into 19 parts: Part 1: Templates;
Part 2: Round inserts;
Part 3: Rectangular inserts;
Part 4: Shouldered guide pins;
Part 5: Headed guide pins;
-Part 6: Headed guide bushings;
-Part 7: Straight guide bushings;
Part 8: Push plates;
Part 9: Push pins Plate guide column;
Part 10: Push plate guide sleeve;
Part 11: Push rod;
-Part 12: Reset rod;
-Part 13: Push plate washer;
-Part 14: Limit pin;
-Part 15: Cushion;
-Part 16: Flat push rod;
Part 17: Push tube;
Part 18: Support column;
Part 19: Positioning element.
This part is Part 2 of GB/T 4678. wwW.bzxz.Net
This part replaces GB/T 4678.2--1984 "Circular inserts for die casting parts". Compared with GB/T4678.2-1984, this part has the following major changes: the arrangement of the standard has been greatly modified, "Foreword", "Scope" and "Normative Reference Documents" have been added, and the content of the mark has been specified.
The size specification series has been modified, and the large size specification series has been added. The material has been changed to recommended selection.
The geometric and position tolerance requirements of the reference surface have been added. -Surface roughness replaces the smoothness in the original standard. This part was proposed by the China Electrical Equipment Industry Association. This part is under the jurisdiction of the National Technical Committee for Standardization of Die (SAC/TC33). The drafting units of this part: Shanghai Pierburg Nonferrous Parts Co., Ltd., Guangzhou Cavity Die Factory, Guilin Electrical Science Research Institute, Dongfeng Technology Automotive Braking System Company, Chengdu Xingguang Die Casting Industry Co., Ltd. The main drafters of this part: Zhang Liangen, Cai Zijin, Weng Shizhen, Feng Bochun, Liao Hongyi, Yang Zhaoling, Huang Zhilu, Li Hongying. This part was first issued in September 1984 and revised for the first time in 2003. 6
1 Scope
Die casting die parts Part 2: Circular inserts
This part specifies the dimensions and tolerances of circular inserts for die casting dies. This part applies to circular inserts used in die casting dies. This part also gives material guidelines and hardness requirements, and specifies the marking of circular inserts. 2 Normative references
GB/T 4678.2—2003
The clauses in the following documents become clauses of this part through reference to this part of GB/T4678. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this part. However, parties to an agreement based on this part are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this part.
GB/T1184—1996 Tolerance of shape and position without tolerance value GB/T4679~—2003 Technical conditions for die casting parts 3 Dimensions and specifications
See Figure 1 and Table 1.
Surface roughness in microns
Figure 1 [
Circular insert
4 Material and hardness
The material is selected by the manufacturer. 4Cr5MoSiV1 and 3Cr2W8V are recommended. Hardness 44HRC~48HRC.
5 Technical requirements
5.1 Fully annealed after forging.
5.2 The shape and position tolerances of the reference surface shall comply with the provisions of GB/T1184-1996, and t and t2 shall be grade 5 accuracy. 5.3 The rest shall comply with the provisions of GB/T4679—2003. GB/T 4678.2-2003
Circular inserts according to this part should have the following markings: a) Circular insert;
Circular insert size
Circular insert diameter D, in millimeters; circular insert thickness H, in millimeters; c)
Code of this part, i.e. GB/T4678.2—2003. d)
Example:
Circular insert with D=63mm and H=32mm is marked as follows: GB/T 4678.2—2003
Circular insert 63X32
Unit is millimeters
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