GOST 3212-92 PDF

Full title and description

ГОСТ 3212-92 — Комплекты модельные. Уклоны формовочные, стержневые знаки, допуски размеров. (English title: "Gated patterns — Pattern tapers, core prints, dimensional tolerances"). This interstate (GOST) standard establishes rules for design and dimensional tolerances of model (pattern) sets used in foundry moulding: required draft angles (slopes) on pattern and core-print surfaces, recommended heights and shapes of core prints and signs, and permissible dimensional tolerances for different classes of model sets.

Abstract

GOST 3212-92 defines geometrical and dimensional requirements for model (pattern) kits used in sand and other moulding processes. It gives normative values for draft angles (depending on sign height and position), prescribes dimensions and clearances for core prints and core seats, and specifies tolerance classes for pattern elements and assembled model kits to ensure interchangeability and manufacturability in foundry production. The standard replaces several earlier GOSTs and is intended for use in design, production and quality control of pattern equipment.

General information

• Status: Active (document in force / действует).
• Publication date: Introduced 1 July 1993 (approved by the Committee of Standardization and Metrology of the USSR 05 Feb 1992, resolution No. 110).
• Publisher: Interstate (GOST) standard — approved by the Committee for Standardization and Metrology (Gosstandart) / Межгосударственный стандарт.
• ICS / categories: ICS 25.120.30 (Foundry and casting technology / moulding equipment).
• Edition / version: GOST 3212-92 (1992 standard, effective from 1993-07-01); replaces GOST 3212-80, GOST 3606-80 and GOST 11961-87.
• Number of pages: 24 pages (standard document length as published in normative libraries/ebooks).

Scope

This standard applies to model (pattern) kits used for manufacturing castings. It sets mandatory and recommended geometric parameters for sign surfaces (draft angles), core-print (core-seat) configurations and heights, methods to determine technological clearances between pattern and cores, and dimensional tolerance limits depending on model-kit accuracy class and the material of the model (metal, plastics, wood, etc.). It is intended for designers of pattern equipment, toolmakers and foundry technologists engaged in tooling and mould design.

Key topics and requirements

• Draft angles (уклоны) for pattern and core-print surfaces with tables of recommended angles by sign height ranges (examples: larger draft angles for small signs, progressively smaller angles for taller signs).
• Recommended heights and forms of lower and upper vertical and mushroom-shaped core prints (знаковые поверхности и стержневые знаки).
• Technological clearances and gaps between pattern signs and core (технологические зазоры), with values depending on accuracy class and material of model kit.
• Dimensional tolerances for pattern elements and assembled model kits, classified by accuracy classes of model sets (classes 1, 2, 3, etc.).
• Rules for selecting sign heights and when to increase dimensions (for example, when chillers or gating elements interfere with sign zones).
• Normative references and cross-references to related GOSTs used in foundry and tooling design.

Typical use and users

Primary users are foundry designers, patternmakers, tooling and fixture engineers, quality inspectors in casting plants, and technical documentation specialists preparing drawings for moulding patterns. The standard is used when designing pattern kits for sand moulding, core-making and mass or series production of castings to ensure proper demoulding, core fit and dimensional interchangeability.

Related standards

GOST 3212-92 replaces earlier documents including GOST 3212-80, GOST 3606-80 and GOST 11961-87 and is referenced by other foundry and machining standards (examples: GOST 1215-79 and various GOSTs on fixtures and cast parts). Users should consult nearby GOSTs for complementary requirements on castings, materials and inspection methods.

Keywords

model set; pattern; pattern kit; gated pattern; draft angle; slope; core print; core seat; dimensional tolerances; model accuracy class; foundry; moulding; patternmaker.

FAQ

Q: What is this standard?

A: GOST 3212-92 is an interstate standard that specifies geometric design features and dimensional tolerances for model (pattern) kits used in foundry moulding (drafts, core prints, clearances and tolerances).

Q: What does it cover?

A: It covers recommended draft angles for sign surfaces, dimensions and heights for core prints and signs, technological clearances between pattern and core, and tolerance classes for pattern elements and assembled model kits. The standard includes tables and figures with normative values.

Q: Who typically uses it?

A: Foundry engineers, patternmakers, tooling designers, quality control engineers and technical documentation specialists in metal-casting and mouldmaking industries.

Q: Is it current or superseded?

A: GOST 3212-92 was introduced (effective) 1 July 1993 and is listed in normative libraries as active (действует); it replaced earlier versions (for example GOST 3212-80). Users should check national/regional collections for any later amendments or national adoptions that might affect applicability.

Q: Is it part of a series?

A: It is part of the GOST family of standards covering foundry technology and tooling; it specifically addresses model kits and cross-references other GOSTs for casting practice and tooling dimensions.

Q: What are the key keywords?

A: Pattern/model kit, draft (slope), core print, core seat, dimensional tolerance, model accuracy class, foundry moulding.