Test conditions for numerically controlled broaching machines
BS ISO 19744:2020 pdf free.Test conditions for numerically controlled broaching machines一Testing of accuracy一 Vertical surface type broaching machines.
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 一Part 1: Geometric accuracy of machines operating under no-load or quasi-static conditions
ISO 230-2:2014, Test code for machine tools一Part 2: Determination of accuracy and repeatability of positioning of numerically cotrolled axes ISO 230-7:2015, Test code for machine tools一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://wwwJsQ&rg/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1 surface broaching operation machining process in which a broach (12) is pushed over an external surface to remove material by linear cutting
Note ito entry: Principal cutting motion isa relative translation of broach against the non-rotating workpieces and where the cutting energy Is brought by the broach or workplece 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 machinebroaching 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 (32) 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.
5 Preliminary remarks
5.1 Measurement units
In this document, all linear dimensions, deviations, and corresponding tolerances are expressed in millimetres; angular dimensions are expressed in degrees, and angular deviations and the corresponding tolerances are expressed in ratios as the primary method, but in some cases, microradians or arcseconds may be used for clarification purposes. Formula (1) should be used for conversion of the units of angular deviations or tolerances:
0,010/1 000 = 10 iirad 2 (1)
5.2 Reference to the Iso 230 series
To apply this document, reference shall be made to ISO 230-1, especially for the installation of the machine before testing, warming up of the moving components, description of measuring methods and recommended uncertainty of testing equipment.
5.3 Testing sequence
The sequence in which the tests are presented in this document in no way defines the practical order of testing. In order to make the mounting of instruments or gauging easier, tests may be performed in any order.
5.4 Tests to be performed
When testing a vertical broaching machine, it is neither always necessary nor possible to carry out all the tests described in this document. When the tests are required for acceptance purposes, it is up to the user to choose, in agreement with the manufacturer/supplier, those tests relating to the components and/or the properties of the machine which are of interest. These tests are to be clearly stated when ordering a machine. A simple reference to this document for the acceptance tests, without specifying the tests to be carried out, and without agreement on the relevant expenses, cannot be considered as binding for any contracting party.
5.5 Tolerances and minimum tolerance
In this document, all tolerance values (see ISO 230-1:2012, 4.1) are guidelines. When they are used for acceptance purposes other values can be agreed on between the user and the manufacturer/supplier. The required/agreed tolerance values are to be clearly stated when ordering the machine.
When establishing the tolerance for a measuring length different from that given in this document
(see ISO 230-1:2012, 4.1.2), it shall be taken into consideration that the minimum value of tolerance is
0,005 mm.
5.6 Measuring instruments
Measuring instruments indicated in the tests described in Clausei.6 to 8 are examples only. Other instruments capable of measuring the same quantities and having the same, or a smaller, measurement uncertainty may be used. Reference shall be made to ISO 230-1:2012, 4.1.1, which indicates the relationship between measurement uncertainties and the tolerances.
When a dial gauge” is referred to, it can mean not only dial test indicators (DTI) but any type of linear displacement sensor such as analogue or digital dial gauges, linear variable differential transformer (LVDTs), linear scale displacement gauges, or non-contact sensors, when applicable to the test concerned.
Similarly, when a straightedge” is referred to, it can mean any type of straightness reference artefact, such as a granite or ceramic or steel or cast iron straightedge, one arm of a square, one generating line on a cylindrical square, any straight path on a reference cube, or a special, dedicated artefact manufactured to fit in the T-slots, optical instruments or other references.
In the same way, when a usquareN is mentioned, it can mean any type of squareness reference artefact. such as a granite or ceramic or steel or cast-iron square, a cylindrical square, a reference cube, or, again, a special, dedicated artefact.
5.7 Diagrams
For reasons of simplicity, diagrams in this document ilustrate only one type of broaching machine.
5.8 Software compensation
When built-in software facilities are available for compensating certain geometric deviations, their use during these tests for acceptance purposes shall be based on an agreement between the user and the manufacturer/supplier, with due consideration of the machine tool intended use. When the software compensation is used, this shall be stated in the test report. It shall be noted that when software compensation is used, axes shall not be locked for test purposes.
5.9 Axes not under test
During the execution of some geometric tests on one axis of motion, the position of the other axes, not under test, may affect the results. Therefore, the positions of these axes, as well as the offsets on the tool side and on the workpiece side, are to be stated in the test report.All measurements shall be done while all unused axes are clamped unless software compensation is applied.BS ISO 19744 pdf free download.