GB/T 4678.14-2023Die casting dies—Components—Part 14: Limit pins (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules for Standardization Documents" drafting.

This document is part 14 of GB/T 4678 "Parts of die-casting molds". GB/T 4678 has released the following parts.

--- Part 1. template;

--- Part 2. Round inserts;

--- Part 3. Rectangular inserts;

--- Part 4. Square guide pillars;

--- Part 5. Circular guide pillars;

--- Part 6. Guide bushing with head;

--- Part 7. Straight guide bushing;

--- Part 8. Push plate;

--- Part 9. Push plate guide column;

--- Part 10. Push plate guide sleeve;

--- Part 11. Putters;

--- Part 12. Reset lever;

--- Part 13. Push plate gasket;

--- Part 14. Limit nails;

--- Part 15. Pads;

--- Part 16. Flat push rod;

--- Part 17. Push tube;

--- Part 18. Support columns;

--- Part 19. Positioning elements.

This document replaces GB/T 4678.14-2003 "Die Casting Mold Parts Part 14: Limiting Nails", and GB/T 4678.14-2003 In comparison, except for structural adjustments and editorial changes, the main technical changes are as follows:

a) B-type limit nails are added (see 4.2);

b) Changed the size series of A-type limit nails (see Table 1, Table 1 of the 2003 edition);

c) Change the tolerances of D, L, and h in Table 1 to be marked in Figure 1 (see Figure 1, Figure 1 of the 2003 edition);

d) Added the tolerance value of dimension L in Figure 1 (see Figure 1, Figure 1 of the 2003 edition).

Introduction

Die-casting mold parts standards are basic technical documents for the design, manufacture, inspection and acceptance of die-casting mold parts. GB/T 4678 "Die-casting mold parts The formulation of "Parts" aims to unify the basic structure and specifications of die-casting mold parts, standardize their technical requirements, and improve the product quality of domestic die-casting mold parts The interchangeability of products with different brands reduces production costs. Due to the large number of parts, the number of typical parts of the die-casting mold will be

GB/T 4678 is divided into the following 19 parts.

--- Part 1. template;

--- Part 2. Round inserts;

--- Part 3. Rectangular inserts;

--- Part 4. Square guide pillars;

--- Part 5. Circular guide pillars;

--- Part 6. Guide bushing with head;

--- Part 7. Straight guide bushing;

--- Part 8. Push plate;

--- Part 9. Push plate guide column;

--- Part 10. Push plate guide sleeve;

--- Part 11. Putters;

--- Part 12. Reset lever;

--- Part 13. Push plate gasket;

--- Part 14. Limit nails;

--- Part 15. Pads;

--- Part 16. Flat push rod;

--- Part 17. Push tube;

--- Part 18. Support columns;

--- Part 19. Positioning elements.

Each part stipulates the structure, technical requirements, material requirements, marks, etc. of one of the parts, which can be customized according to the mold structure requirements.

According to the requirements, refer to the corresponding parts to design and manufacture die-casting mold parts.

GB/T 4678 was released for the first time in 1984. According to the needs of the development of the die-casting mold industry, all parts were tested for the first time in 2003. revised. In recent years, with the development of my country's industry and economy, the design and manufacturing technology of domestic large-scale, precise and complex high-end die-casting molds has become more and more Mature. At the same time, with the application of new materials and new processes and the requirements of international standards brought by the export of molds, the basic dimensions of die-casting mold parts Changes have taken place in series, precision requirements, markings, packaging, etc.

The National Mold Standardization Technical Committee completed Part 1~Part 13 and Part 1 of GB/T 4678 from 2012 to 2021 15 part revisions of Part 15 and Part 19: The document for this revision is Part 14 of GB/T 4678.

Revised so that it can timely and comprehensively reflect the latest mature technical content of the die-casting mold industry, and at the same time meet the compilation requirements of GB/T 1.1-2020, and It is of great significance to the technological progress and industrial upgrading of the die-casting industry to coordinate with other revised die-casting mold parts standards. Die-casting mold parts - Part 14. Stop nails

1 Scope

This document specifies the types, dimensions, materials, technical requirements and markings of limit pins for die-casting dies.

This document is applicable to the design and manufacture of limit pins for die-casting molds.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 1800.1-2020 Geometric Product Specifications (GPS) Linear Dimensional Tolerances ISO Code System Part 1: Tolerances, Basis of Deviation and Fit

GB/T 4679 Technical conditions for die-casting mold parts

3 Terms and Definitions

This document does not have terms and definitions that need to be defined.

4 Types and sizes

4.1 The type of A-type limit nails should be in accordance with Figure 1, and the dimensions should be in accordance with the values given in Table 1.

Surface roughness in microns Dimensions are in millimeters The unfilled surface roughness Ra should be 3.2µm; the unfilled chamfer should be 1mm×45°.