ISO 19744-2020 pdf free download – Test conditions for numerically controlled broaching machines — Testing of accuracy — Vertical surface type broaching machines.
This document specifies, with reference to ISO 230-1, the geometric tests on numerically controlled (NC) broaching machines of normal accuracy, with vertical axis acting for cutting operation. The accuracy of rotary axes, if available, is checked with reference to ISO 230-7. This document also specifies, with reference to ISO 230-2, the positioning tests on vertical surface type broaching machines for both linear and rotary axes.
This document proposes test pieces containing broached slots and grooves with reference to ISO 230-1, cutting tests under finishing conditions. It also specifies the characteristics and dimensions of the test pieces themselves. This document is intended to supply minimum requirements for assessing the cutting accuracy of the machine.
This document also establishes the tolerances for the test results corresponding to general purpose and normal accuracy vertical surface type broaching machines equipped with numerical control. This document explains different concepts or configurations and common features of NC vertical surface type broaching machines which are normally used in the manufacturing of turbine disks. It also provides a terminology and designation of controlled axes with reference to ISO 841. This document deals only with the verification of the accuracy of the broaching machine. It does not apply to the operational testing of the machine (e.g. vibration, abnormal noise, stick-slip motion of components), nor to machine characteristics (e.g. speeds, feeds) as such checks are generally carried out before testing the accuracy.
2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 230-1:2012, Test code for machine tools — Part 1: Geometric accuracy of machines operating under no-load or quasi-static conditions
ISO 230-2:2014, Test code for machine tools — Part 2: Determination of accuracy and repeatability of positioning of numerically controlled axes
ISO 230-7:2015, Test code for machine tools — Part 7: Geometric accuracy of axes of rotation
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 230-1, ISO 230-2, ISO 230-7 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
surface broaching operation
machining process in which a broach (3.2) is pushed over an external surface to remove material by linear cutting
Note 1 to entry: Principal cutting motion is a relative translation of broach against the non-rotating workpieces and where the cutting energy is brought by the broach or workpiece motion.
3.2
broach
cutting tool that has multiple transverse cutting edges each with progressively increased size
3.3
broaching machine
machine tool in which broaching operation is executed
3.4
vertical broaching machine
broaching machine (3.3) whose main cutting axis (Z-axis) is vertical
3.5
vertical surface type broaching machine
vertical broaching machine (3.4) in which its broach (3.2) is pushed or pulled over an external surface of the workpiece to remove material
4 Terminology and designation of axes
See Figure 1 and Figure 2.
A common configuration of NC vertical surface type broaching machines with A-axis is shown in Figure 2. The nomenclature for the structural components of the broaching machine are shown in Figure 1.ISO 19744 pdf download