ISO 22402-2:2022

Overview

ISO 22402-2:2022 is an international standard published by the International Organization for Standardization (ISO) that defines the dimensions and design requirements for medium-transfer units used in polygonal taper tool interfaces. This standard specifically addresses transfer units compatible with the polygonal taper systems outlined in the ISO 26623 series. These units are critical for enabling fluid transfer in wet processing applications and for interfacing machine tools with insert nuts.

The standard ensures interchangeability, reliability, and precision in tooling systems where polygonal tapers are employed, thereby supporting consistent manufacturing quality and operational efficiency in metalworking, machining, and other industrial processes.

Key Topics

• Scope and Application
  Specifies dimensions for medium-transfer units for polygonal taper interfaces suitable for wet processing environments and machine tool interfaces with insert nuts.

• Nominal Sizes
  Defines transfer unit designs for nominal sizes ranging from 32 to 100 mm, covering a broad spectrum of tooling sizes typically used in industrial environments.

• Dimensional Specifications
  Provides detailed measurements including diameters, thread sizes, lengths, and radii for each nominal size, ensuring precise fitting and optimal performance.

• Design Requirements

  • Units must withstand pressures of at least 70 bar, suitable for high-pressure liquid transmission.
  • Angular movement allowance of ±1° with minimal displacement force to support mechanical flexibility.
  • Surface hardness of supply tubes must be at least 56 HRC (Rockwell Hardness C) to guarantee durability and wear resistance.
  • Special design features such as lead-in chamfers, sliding sleeves for mounting (sizes 32 to 50), and polished surfaces to enhance sealing and mechanical stability.

• Sealing and Assembly
  Includes an assembly model with specified O-ring sizes for effective sealing of the transfer units, preventing leaks during fluid transfer under operational conditions.

• Designation System
  A clear and standardized method for naming transfer units, for example:
  Transfer unit ISO 22402-2 - 50 for a polygon-shank with a nominal size of 50 mm.

Applications

ISO 22402-2:2022 is essential for industries and engineers requiring standardized, reliable liquid transfer solutions in tool interfaces with polygonal tapers. Typical applications include:

• Machine Tool Industry
  Facilitating efficient liquid (coolant or lubricant) transfer in CNC machines, milling, and drilling operations using polygonal taper tool holders.

• Wet Processing Operations
  Ensuring sealed and robust fluid transmission in cutting, grinding, or polishing processes where cooling or lubrication is vital.

• Precision Manufacturing
  Maintaining tight dimensional tolerances and exchangeability of tooling components to guarantee consistent machining quality.

• Tooling Component Design and Manufacturing
  Guiding OEMs and tooling manufacturers in producing transfer units compliant with international standards, thereby ensuring compatibility and performance.

Related Standards

• ISO 26623 Series – Polygonal Taper Interfaces
  Governs the overall geometry and system requirements for polygonal taper tool holders and insert nuts, upon which ISO 22402-2’s transfer units are based.

• ISO 22402-1 – Medium-transfer Units for Tool Interfaces – Part 1
  Addresses other types of tool interface transfer units, offering complementary guidelines across different interface technologies.

• Additional ISO/TC 29 Standards
  ISO technical committee 29 covers small tools, cutting edges, and interfaces, providing a comprehensive framework for tooling components standardization.

Keywords: ISO 22402-2, polygonal taper interface, medium-transfer units, tool interfaces, wet processing, machine tool insert nuts, ISO 26623 series, fluid transfer, tool holder standards, transfer unit dimensions, high pressure sealing, tooling standards.