Overview
ISO 9448-9:2013 is an international standard published by the International Organization for Standardization (ISO) that specifies the main dimensions, tolerances, and material requirements for guide bushes used in press tools. Specifically, this part covers form B, plain ball cage bushes, type 2, which are designed to be mounted in clamp plates by interference fit. The standard ensures precision, consistency, and interchangeability of these critical components in tooling applications.
This standard is essential for manufacturers, tool designers, and engineers involved in the production and maintenance of press tools, supporting reliable operation and extending tool life.
Key Topics
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Dimensions and Tolerances
ISO 9448-9:2013 precisely defines the main dimensions of type 2 plain ball cage bushes in millimetres, including guiding diameter and length. It specifies tolerance classes, such as H7 for the bush fit and M5 for the internal diameter, ensuring optimal preload for ball bearings.
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Material and Hardness Requirements
While the choice of material is left to the manufacturer, the hardness is strictly set at 60 HRC (Rockwell Hardness Scale) to assure durability and wear resistance. This aligns with ISO 6508-1 standards for hardness testing.
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Designation System
The standard provides a clear designation format for these guide bushes, including reference to the standard number, bush form, guiding diameter, and length. For example:
Guide bush ISO 9448-9 B - 25 × 50
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Manufacturing Guidelines
Details like chamfers, radii, and lubrication grooves are not fixed by the standard, allowing manufacturers flexibility to tailor guide bushes to specific tooling needs while maintaining core dimensional and hardness criteria. Surface finish requirements on critical diameter ensure precise assembly and function.
Applications
ISO 9448-9:2013 guide bushes are primarily used in press tool assemblies, where accurate and reliable guidance of moving parts is crucial. Typical applications include:
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Metal Stamping and Forming Tools
Ensuring the smooth movement of press components for high-precision metal forming operations.
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Automotive and Aerospace Manufacturing
Supporting the production of complex body panels and structural parts requiring tight tolerance guidance systems.
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Tool and Die Industry
Facilitating the design, manufacture, and maintenance of various pressing and moulding tools that depend on reliable ball cage bushes for extended service life.
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General Industrial Machinery
Anywhere a robust, interference-fit bush with a ball cage is needed to guide and support high loads and repetitive motion.
Adopting ISO 9448-9-compliant ball cage bushes helps reduce downtime, maintain product quality, and minimize maintenance costs by ensuring standardization and interchangeability.
Related Standards
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ISO 9448 Series
This standard is part 9 of the ISO 9448 series covering various forms and types of guide bushes for pressing tools including:
- Part 1: Forms
- Part 2: Form A, gliding bushes, plain, type 1
- Part 3: Form B, ball cage bushes, plain, type 1
- Part 4 to Part 11: Various bushes types and forms for flanged, headed, stepped variations.
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ISO 6508-1
Metallic materials - Rockwell hardness test - Part 1: Test method, referenced for hardness measurement compliance.
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ISO/IEC Directives, Part 1 and Part 2
Guidelines for the development and editorial rules of ISO standards.
Summary
ISO 9448-9:2013 provides critical specifications for form B plain ball cage bushes, type 2, used in press tool applications. The standard supports consistent manufacturing of precision guide bushes with defined dimension tolerances and hardness requirements, enabling reliable tool performance. Manufacturers and engineers benefit from adopting this standard to align with global best practices in pressing tool components.
Keywords: ISO 9448-9, guide bushes, ball cage bushes, press tool components, interference fit bushes, form B bushes, tool pressing standards, hardness 60 HRC, manufacturing tolerances, metal stamping, tool design, industrial tooling.