This part of GB/T5291 specifies the geometric accuracy inspection, processing inspection and inspection of CNC axis positioning accuracy and repeat positioning accuracy of general purpose and conventional precision electric discharge machines (EDM) with reference to GB/T17421.1 and GB/T17421.2. This part also specifies the tolerance values ​​corresponding to the above inspections. This part is applicable to double-column machine tools of mobile spindle head type and cross table type. This part only involves the inspection of machine tool accuracy, and is not suitable for machine tool operation tests (vibration, abnormal noise, creep of parts, etc.) or inspections of its parameters (such as speed, feed rate, etc.), which should usually be carried out before accuracy inspection. GB/T 5291.2-2003 Accuracy inspection of electric discharge machines Part 2: Double-column machine tools (mobile spindle head type and cross table type) GB/T5291.2-2003 Standard download decompression password: www.bzxz.net

GB/T5291 "Precision inspection of electric discharge machines" is divided into two parts: Part 1: Single-column machine tools (cross table type and fixed table type); Part 2: Double-column machine tools (movable spindle head type and cross table type). This part is Part 2 of GB/T5291.
GB/T 5291.2-2003/ISO 11090-2: 1998 This part is equivalent to ISO11090-2:1998 "Machine tool electric discharge machine (EDM) test conditions terminology and precision inspection Part 2: Double-column machine tools (movable spindle head type and cross table type)" (English version). This part is equivalent to ISO11090-2:1998. For ease of use, this part has made the following editorial changes: a) "ISO11090\ is changed to \GB/T 5291\; b) Use the decimal point "" instead of the comma "," as a decimal point; The serial number of the referenced standard shall be followed by the year; c)
The name of this part is written in accordance with the naming convention of Chinese machine tool product standards; d)
The tables in Chapter 6 of this part are modified with reference to GB/T1.1-2000 "Guidelines for standardization work Part 1 Structure and compilation rules of standards";
Delete the foreword of international standards;
Use ISO841:2001 "Industrial automation system and integrated CNC machine tool coordinate system and motion nomenclature" instead of ISO841 "Industrial automation system and integrated CNC machine tool coordinate system and motion nomenclature" |tt||Nomenclature of coordinate systems and motions for physical devices in industrial automation systems" (revised version of ISO841:1974), with the corresponding footnotes deleted.
Please note that some of the contents of this part may involve patents. The issuing agency of this part shall not be responsible for identifying these patents. Appendix A of this part is an informative appendix.
This part is proposed by the China Machinery Industry Federation. This part is under the jurisdiction of the National Technical Committee for Standardization of Special Processing Machine Tools (SAC/TC161). Drafting unit of this part: Suzhou Electric Processing Machine Tool Research Institute. The main drafters of this part: Yu Zhisan, Fu Chunsen, Sun Jie. GB/T 5291.2—2003/IS011090-2:1998 Introduction
GB/T5291 aims to standardize the method of testing the accuracy of electrospark forming machines (EDM). 1 Scope
GB/T5291.2—2003/IS011090-2:1998 Testing of accuracy of electrospark forming machines
Part 2: Double-column machine tools
(movable spindle head type and cross table type) This part of GB/T5291 specifies the geometric accuracy test, processing test and the test of positioning accuracy and repeat positioning accuracy of general-purpose and conventional-accuracy electrospark forming machines (EDM) with reference to GB/T17421.1 and GB/T17421.2. This part also specifies the tolerance values ​​corresponding to the above tests.
This part applies to For double-column machines of the mobile spindle head type and cross table type. This part only deals with the inspection of machine tool accuracy, and is not suitable for machine tool operation tests (vibration, abnormal noise, creep of parts, etc.) or inspection of its parameters (such as speed, feed rate, etc.), which should usually be carried out before the accuracy inspection. This part specifies the terms used for the main components of machine tools and specifies the nomenclature of coordinate axes with reference to ISO841:20011. Note: In addition to the terms expressed in the three official ISO languages ​​(English, French and Russian), Appendix A of this part gives the equivalent terms in Dutch, German, Italian and Swedish. The publication of these language standards is the responsibility of the national member groups of Belgium (IBN), Germany (DIN), Italy (UNI) and Sweden (SIS). However, only the terms given in the official languages ​​can be regarded as ISO terms. 2 Normative references
The clauses in the following documents become the clauses of this part through reference in this part of GB/T5291. For dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this part. However, parties to agreements based on this part are encouraged to investigate whether the latest versions of these documents can be used. For undated references, the latest versions apply to this part.
GB/T 17421.1-1998 General rules for inspection of machine tools Part 1: Geometric accuracy of machine tools under no-load or finishing conditions (egv ISO 230-1: 1996)
GB/T 17421.2-2000 General rules for inspection of machine tools Part 2: Determination of positioning accuracy and repeatability of numerically controlled axes (eqv ISO 230-2: 1997)
3 Terminology and nomenclature of coordinate axes
3.1 Type of mobile spindle head
See Figure 1 and Table 1.
Note: It can be seen that Figure 1 does not comply with the second and third paragraphs of 4.4.2 of ISO841:2001. The designations of X and Y may be interchanged to suit the length and/or operating position of the coordinate axes, which is at the discretion of the manufacturer. GB/T 5291.2—2003/IS0 11090-2:199810
Chinese
Table (Y' axis)
Slide (X axis)
Working fluid tank
Spindle head (W axis)
Spindle (Z axis)
Electrode mounting plate
Rotation axis (C axis)
Cross table type
See Figure 2 and Table 2. Www.bzxZ.net
Fig. 1 Double-column machine tool with movable spindle head
Table 1 Terminology
column
table(Y\--axis)
saddle( X--axis)
work tank
head(W-axis)
quill(Z—axis)
electrode platen
spindle(C—axis)
electrode
montant
table(axe Y')
chariot transversal
(axe X)
reservoir de travail
tete de travail(axe W)
coulisse(axe Z)
porte—electrode
broche(axe C)
electrode
traverse
CTaHIHA
CTOI(OChY')
caa3KH(och X)
paboya HBaHHa
ronoBka,pabouaa(ochW)
IHHOJE(OCh Z)
3iekrporonepkatem
IHHIeJb(OCh C)
TpaBepca
Workbench (Y' axis)
Slide plate (X axis)
Working fluid tank
Spindle head (W axis)
Spindle (Z axis)
Electrode mounting plate
Rotation axis (C axis)
4.1 Measurement unit
GB/T5291.2—2003/IS011090-2:1998Fig. 2 Cross-table double-column machine tool
Table 2 Terminology
column
table(Y'-axis)
saddle(X'--axis)
work tank
head(W—axis)
quill(Z—axis)
electrode platen
spindle(C—axis)
electrode
montant
table(axe Y')
chariot transversal
(axe X')
travail servoir
travail tactile(axe W)
coulisse(axe Z)
porte—electrode
broche(axe C)
electrode
traverse
CTaHHHa
CToika
CTO(OCh Y')||caJia3KH(ocb X')
paCoyaHBaHHa
roJIOBka, paboyag(ocb W)
IHHOJIb(OCb Z)
3JekTponouepkaTeb
IIIHIeI(Och C)
3ekTpon
TpaBepca
In this part of GB/T5291, all linear dimensions, deviations and corresponding tolerances are expressed in millimeters; angles are expressed in degrees, angular deviations and corresponding tolerances are expressed in ratios, but in some cases they can be expressed in microradians or seconds. The following expressions are equivalent: 0.010/1000=10x10-6=10μrad~2\. 3
GB/T 5291.2—2003/ISO 11090-2:19984.2 Reference to GB/T17421.1—1998
In the application of this part of GB/T5291, reference should be made to GB/T17421.1-1998, especially the installation of machine tools before inspection, the preheating of rotating axes and other moving parts, the description of metrological methods and the recommended accuracy of inspection equipment. In the column "Inspection steps described in Chapters 5, 6 and 7", if the relevant inspection complies with the provisions of the relevant provisions of GB/T17421.1-1998, a list of relevant provisions in this part of GB/T17421 is attached. 4.3 Inspection order
The order of inspection items given in this part does not limit the actual order of inspection. In order to simplify the installation of instruments or measuring tools, inspections can be carried out in any order.
4.4 Implementation of inspection
When inspecting machine tools, it is not always necessary or possible to inspect all the items specified in this part. When the inspection items are used for acceptance purposes, they should be inspected with the consent of the supplier (manufacturer). The user shall select the inspection items for the relevant machine tool components or performance indicators that he is concerned about. These inspection items shall be clearly specified when ordering the machine tool. Merely citing the acceptance inspection of this part without explaining how to implement the inspection and without reaching an agreement on the relevant costs shall not be deemed binding on any contracting party. 4.5 Measuring instruments
The measuring instruments specified in the inspection items described in Chapters 5, 6 and 7 are only examples, and other instruments that can measure the same parameters and at least the same accuracy may also be used. The indicator shall have a resolution of 0.001mm or higher. 4.6 Machining inspection
Machining inspection is only used for finishing and not for roughing that is prone to produce significant cutting forces. 4. 7 Minimum tolerance
When determining the tolerance when the measured length is different from the length specified in this part (see 2.3.1.1 in GB/T17421.1-1998), the minimum tolerance value should be calculated to 0.005mm.
4.8 Positioning accuracy inspection and reference GB/T17421.2-2000 Inspection items P2 to P5 are only applicable to CNC EDM machines. When implementing these inspections, GB/T17421.2-2000 should be referenced, especially in terms of environmental conditions, machine preheating, measurement methods, calculation of results and data processing.
Does not include inspection of the W axis, because the movement of the W axis is usually used to adjust the spindle The position of the spindle head. If necessary, the same inspection as the Z axis should be carried out.
5 Geometric accuracy inspection
Linear motion axis
Inspection of the straightness of the X-axis motion
a) In the XY horizontal plane;
b) In the zX vertical plane.
Supply tolerance
For a) and b)
0.015 on any 500 measuring length
Measuring instrument
Straight ruler, indicator and gauge block, or optical method inspection steps and refer to 5.2.3.2.1.1 of GB/T17421.1-1998. The indicator is fixed on the spindle head.
GB/T 5291.2—2003/IS0 11090-2:1998G1
Measured deviation
a) Place a straightedge in the XY plane so that it is parallel to the X axis and the indicator touches the straightedge. Move the X axis over the entire measuring length and record the reading.
b) Repeat the check in the same way in the ZX plane. GB/T 5291.2-2003/ISO 11090-2: 1998Item
Checking the straightness of the Y-axis movement
a) In the XY horizontal plane;
b) In the YZ vertical plane.
For a) and b)
0.015 over any 500 measuring length
Measuring instruments
Straightedge, indicator and gauge block, or optical method inspection steps and refer to 5.2.3.2.1.1 of GB/T17421.1--1998. The indicator is fixed on the spindle head.
Measured deviation
a) Place the straightedge in the XY plane so that it is parallel to the Y axis and the indicator touches the straightedge. Move the Y axis over the entire measuring length and record the reading.
b) Repeat the inspection in the same way in the YZ plane. 6
Check the perpendicularity between the X-axis movement and the Y-axis movement. Simplified diagram
0.02 on any 500 measuring length
Measuring instruments
Straightedge, angle ruler and indicator
Testing steps and refer to 5.5.2.2.4 in GB/T17421.1--1998GB/T 5291.2--2003/ISO 11090-2: 1998G3
Measured deviation
Adjust the straightedge on the workbench so that it is parallel to the X-axis movement and place the angle ruler close to the straightedge. Fix the indicator on the spindle head so that it touches the angle ruler. Move the Y axis over the entire measuring length and record the reading. Alternatively, you can use only the angle ruler, in which case:
a) Set the angle ruler so that its long side is parallel to the X-axis movement; b) Check the parallelism between the Y-axis movement and the short side of the angle ruler. GB/T 5291.2—2003/IS0 11090-2:1998 Item
Vertical movement of the spindle (Z axis) and
a) X axis movement;
b) Y axis movement
Vertical inspection.
For a) and b)
0.02 on any 300 measuring length
Measuring instruments
Cylindrical square, plate, adjustment block and indicator b)
Inspection steps and refer to 5.5.2.2.4 Measured deviation in GB/T17421.1-1998
Place the plate on the workbench and adjust the plate so that its plane is parallel to both the X axis and the Y axis. The cylindrical square is placed on the plate. The indicator is fixed on the spindle.
Make the indicator touch the cylindrical square in the X direction, move the spindle in the Z direction over the entire measuring length and record the readings of several a
positions. The maximum difference in the readings should not exceed the tolerance. b) Repeat the inspection in the same way in the Y direction. Item
Vertical movement of the spindle head (W axis) and
a) X axis movement;
b) Y axis movement
Verticality inspection between.
For a) and b)
0.02
on any 500 measuring length
Measuring instrument
Cylindrical square, plate, adjustment block and indicator inspection steps and refer to 5.5.2.2 of GB/T17421.11998.4GB/T5291.2—2003/IS011090-2：1998G5
Measured deviation
Place the flat plate on the workbench and adjust it so that its plane is parallel to both the X-axis and the Y-axis. The cylindrical square is placed on the flat plate. The indicator is fixed on the spindle head.
a) Let the indicator touch the cylindrical square in the X direction, move the spindle head in the W direction over the entire measuring length and record the readings at several positions. The maximum difference in the readings should not exceed the filling difference. b) Repeat the inspection in the same way in the Y direction. GB/T5291.2—2003/ISO11090-2:1998Item
Inspection of spindle runout during Z-axis movement.
0.04/200 on any 300 measuring length
Measuring instrument
Indicator and cylindrical square
Inspection steps and refer to 5.2.3.1.3G6 in GB/T17421.1-1998
Measured deviation
Put the cylindrical square on the workbench, roughly parallel to the Y axis, so that the probe of the indicator mounted on the special bracket touches the cylindrical square. Note down each reading and mark the corresponding height on the cylindrical square. Move the indicator to the other side of the spindle, move the X axis, so that the probe touches the cylindrical square again along the same straight line, and the possible runout of the X axis movement will be measured and counted. Re-zero the indicator, re-measure at the same height in each original position and record. Calculate the difference between the two readings at each measuring height, select the maximum and minimum of these differences, and calculate the result by the following formula: Maximum difference minus minimum difference
shall not exceed the tolerance, where d is the distance between the two positions of the indicator. 10
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