CN110421393B - Method for rapidly and secondarily aligning numerical control milling workpiece - Google Patents
Method for rapidly and secondarily aligning numerical control milling workpiece Download PDFInfo
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- CN110421393B CN110421393B CN201910456987.0A CN201910456987A CN110421393B CN 110421393 B CN110421393 B CN 110421393B CN 201910456987 A CN201910456987 A CN 201910456987A CN 110421393 B CN110421393 B CN 110421393B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/18—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for positioning only
- B23Q3/186—Aligning devices
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Abstract
The invention belongs to the field of numerical control mechanical milling, and provides a method for quickly and secondarily aligning a numerical control milling workpiece, which uses a numerical control reference hole as a basis, uses reference hole site coordinate information (X, Y, Z) actually measured by a numerical control machine tool, and then resets a processing coordinate system in Catia drawing software according to the hole site coordinate information (X, Y, Z) to perform numerical control processing again. The invention is simple, fast and accurate.
Description
Technical Field
The invention belongs to the field of numerical control mechanical milling, and discloses a method for secondarily aligning a workpiece by using Catia drawing software.
Background
When a workpiece is milled and processed by a numerical control machine, due to defects of processing procedures and procedures, or infirm clamping, or secondary adding work and the like, (on the premise that the workpiece is not scrapped or newly manufactured), the workpiece can be aligned secondarily through a reserved reference hole, surface, reference line and the like during primary processing.
The method is based on a numerical control reference hole, and comprises the steps of utilizing the actually measured reference hole position coordinate information (X, Y, Z) of the numerical control machine tool to reset a machining coordinate system in Catia drawing software according to the hole position coordinate information (X, Y, Z), programming and carrying out numerical control again.
Disclosure of Invention
The purpose of the invention is as follows:
the invention provides a method for quickly and secondarily aligning a numerical control milling workpiece, which is simple, quick and accurate.
The technical scheme is as follows:
a method for quickly and secondarily aligning a numerical control milling workpiece,
and (3) based on the numerical control reference hole, resetting a machining coordinate system in Catia drawing software according to the reference hole position coordinate information (X, Y, Z) actually measured by the numerical control machine tool and the hole position coordinate information (X, Y, Z) for numerical control machining again.
The method comprises the following steps:
step 1, placing a workpiece on a clean machine tool platform, and clamping and fixing the workpiece;
step 2, measuring a reference hole on the workpiece by using a measuring system of the numerical control machine; wherein the hole site information comprises: the number of holes is at least 2, 1 hole site coordinate is set as an origin, and the coordinate value is (0, 0); the coordinate values of 1 hole site are actually measured and taken according to the origin of coordinates as a reference;
step 3, in Catia drawing software, combining a theoretical digital model and an actual measurement value of a workpiece reference hole, aligning the workpiece, and resetting a machining coordinate system;
and 4, finishing the secondary alignment and subsequent processing of the workpiece according to the processing coordinate system after the secondary alignment.
The step 3 comprises the following steps:
step 31, drawing a line segment 1, a line segment 2 and a line segment 3 according to the specific coordinate values of the hole 1 and the hole 2 in a schematic drawing interface of Catia drawing software; wherein: the specific length value of the "line segment 1" is the coordinate X value of the "hole 2", the specific length value of the "line segment 2" is the coordinate Y value of the "hole 2", the length value of the "line segment 3" is the distance between the "hole 1" and the "hole 2";
step 32, adding constraints in the Catia interface according to the right-angle geometric relationship, and adding the line segment 1 and the line segment 2 into a mutually vertical relationship, namely adding the right-angle constraint;
and step 33, re-establishing a machining coordinate system A2 in the Catia programming interface according to the determined line segments 1, 2 and 3, and performing programming operation according to the newly established machining coordinate system A2.
In step 33, the coordinate system a2 is a newly established coordinate system required for secondary alignment, the coordinate system a1 is a coordinate system of the machine tool workpiece placement posture, and the secondary alignment can be determined to be correct only if the coordinate systems a1 and a2 coincide with each other, that is, the theoretical coordinate system a2 under the Catia programming interface coincides with the coordinate system a1 of the machine tool workpiece placement posture.
Further comprising:
and step 34, measuring the coordinate value of the hole 2 under the A2 coordinate system by using a Catia measuring tool, and contrasting whether the coordinate value measured by the hole 2 is consistent with the coordinate value measured under the A1 coordinate system of the machine tool.
And if the coordinate value of the 'hole 2' measured in the A2 coordinate system is not consistent with the coordinate value measured in the A1 coordinate system of the machine tool, returning to the step 2.
The numerical control machine tool should be at least provided with a measuring head and a measuring system.
In the step 1, the workpiece can be randomly placed within the effective stroke of the numerical control machine tool.
Advantageous effects
Compared with the conventional method for aligning the workpiece by an operator, the method has the beneficial effects that:
1. the workpiece can be placed in any direction in the effective stroke of the numerical control machine tool.
2. According to the method, 3 straight line segments are drawn by directly applying a right-angle geometric principle in Catia according to actually measured reference hole site information, and constraints are added; the principle is simple, calculation is not needed, the operation is convenient, and the secondary alignment precision is high.
3. The invention is suitable for various numerical control milling machines and workpieces with various overall dimensions, and has wide application.
Drawings
The invention relates to a secondary alignment method of a numerical control milling part, which comprises 3 figures, wherein the figures of the figures are illustrated as follows: FIG. 1 is a schematic diagram showing the placement position of a workpiece on a machine tool and the state of hole sites; FIG. 2 illustrates the workpiece in machine coordinates after arbitrary placement; fig. 3 illustrates the coordinate information of the hole 2 in the machine coordinate system and how the line is drawn and the constraints are added in Catia cartography software.
Detailed Description
The present invention is described in further detail below.
The invention is characterized in that the numerical control reference hole is used as a basis, the reference hole position coordinate information (X, Y, Z) actually measured by a numerical control machine tool is used, and a processing coordinate system is reset in Catia drawing software according to the hole position coordinate information (X, Y, Z) for carrying out numerical control processing again.
A workpiece rapid secondary alignment method comprises the following steps:
1. and (4) randomly placing the workpiece on a clean machine tool platform, and clamping and fixing the workpiece.
2. Coordinate information of reference holes (the number of the holes is at least more than or equal to 2) on a workpiece is measured by using a measuring system of the numerical control milling machine. Wherein the hole site information comprises: 1 hole is set as an origin point by a coordinate, and the coordinate value is (0, 0); and the coordinate values of the other 1 hole site are actually measured according to the origin of coordinates as a reference.
3. In the Catia drawing software, a theoretical digital model and the measured value of the workpiece reference hole are combined to align the workpiece, and a machining coordinate system is set again.
4. And finishing the secondary alignment and subsequent processing of the workpiece according to the processing coordinate system after the secondary alignment.
Examples
1. And (3) randomly putting the workpiece on a numerical control milling machine platform as shown in figure 1.
2. Referring to fig. 2, under the cnc machine coordinate system a1, the machine measuring system is used to measure the coordinate values (X, Y) of "hole 2", wherein "hole 1" is set as the origin of coordinates (0, 0).
3. As shown in fig. 3, in the Catia cartographic software sketch interface, "line segment 1", "line segment 2", "line segment 3" are drawn according to the specific coordinate values of "hole 1" and "hole 2"; wherein: the specific length values of "line segment 1" and "line segment 2" are determined by the value of the coordinate X, Y of "hole 2". The length value of "line segment 3" is a fixed value and is determined by theoretical figures of "well 1" and "well 2". Note: specifically, when the lengths of the "line segment 1" and the "line segment 2" are set, the smaller value of the "hole 2" coordinate value X, Y, that is, the longer side is determined by the shorter side in the rectangular geometric relationship (empirical method).
4. And then adding constraint in the Catia interface according to the right-angle geometric relationship, and adding the line segment 1 and the line segment 2 into a mutually vertical relationship, namely adding the right-angle constraint.
5. And then, a machining coordinate system A2 is newly created in a Catia programming interface according to the determined line segments 1, 2 and 3, and programming operation is carried out according to the newly created machining coordinate system A2. The A2 coordinate system is a coordinate system which needs to be newly established for secondary alignment, the A1 coordinate system is an initial machine tool theoretical coordinate system, and only the A1 and A2 coordinate systems coincide with each other, namely the theoretical coordinate system A2 under the Catia programming interface coincides with the coordinate system A1 of the machine tool workpiece placing posture.
6. The coordinate value of "hole 2" was measured in the a2 coordinate system using the Catia measuring tool, and it was checked whether or not the coordinate value measured for "hole 2" agrees with the coordinate value measured in the a1 coordinate system of the machine tool.
The invention belongs to a practical invention. The difference from the conventional method for aligning the workpiece by an operator is that:
1. the invention can be applied without considering the size of the overall dimension of the workpiece.
2. The invention does not need to straighten the workpiece according to X, Y two coordinate directions of the numerically controlled milling machine according to the reference of a reference hole, a reference surface, an auxiliary line and the like of the workpiece. The workpiece can be randomly placed within the effective stroke of the machine tool.
3. The invention is based on Catia drawing software to carry out alignment and programming operation.
4. The invention adopts the Pythagorean theorem a2+b2＝c2The right-angle geometric principle in the method is popular and easy to understand, and the coordinate information of the actually measured reference hole position is directly applied without conversion and operation.
5. The invention has certain requirements on numerical control workpieces, and the workpieces need to have at least 2 datum holes and 1 datum plane (a Z-direction plane of a numerical control milling machine).
6. The invention has certain requirements on the numerical control machine tool, and the machine tool at least needs to be provided with a measuring head and a measuring system, and can measure the hole position information of the workpiece reference hole.
7. In the alignment process, certain errors exist, and the errors come from the self system of the numerical control machine tool and the errors of operators in actual measurement.
Claims (6)
1. A method for rapidly aligning a numerical control milling workpiece for two times, which is characterized in that,
based on the numerical control reference hole, the reference hole site coordinate information (X, Y, Z) actually measured by the numerical control machine tool is used, and a processing coordinate system is reset in Catia drawing software according to the hole site coordinate information (X, Y, Z) for numerical control processing again;
the method comprises the following steps:
step 1, placing a workpiece on a clean machine tool platform, and clamping and fixing the workpiece;
step 2, measuring a reference hole on the workpiece by using a measuring system of the numerical control machine; wherein the hole site information comprises: the number of holes is at least 2, 1 hole site coordinate is set as an origin, and the coordinate value is (0, 0); the coordinate values of 1 hole site are actually measured and taken according to the origin of coordinates as a reference;
step 3, in Catia drawing software, combining a theoretical digital model and an actual measurement value of a workpiece reference hole, aligning the workpiece, and resetting a machining coordinate system;
step 4, finishing the secondary alignment and subsequent processing of the workpiece according to the processing coordinate system after the secondary alignment;
the step 3 comprises the following steps:
step 31, drawing a line segment 1, a line segment 2 and a line segment 3 according to the specific coordinate values of the hole 1 and the hole 2 in a schematic drawing interface of Catia drawing software; wherein: the specific length value of the "line segment 1" is the coordinate X value of the "hole 2", the specific length value of the "line segment 2" is the coordinate Y value of the "hole 2", the length value of the "line segment 3" is the distance between the "hole 1" and the "hole 2";
step 32, adding constraints in the Catia interface according to the right-angle geometric relationship, and adding the line segment 1 and the line segment 2 into a mutually vertical relationship, namely adding the right-angle constraint;
and step 33, re-establishing a machining coordinate system A2 in the Catia programming interface according to the determined line segments 1, 2 and 3, and performing programming operation according to the newly established machining coordinate system A2.
2. The method of claim 1, wherein in step 33, the coordinate system A2 is a newly established coordinate system required for secondary alignment, the coordinate system A1 is a coordinate system of the pose of the machine tool workpiece, and the secondary alignment is determined to be correct only if the coordinate systems A1 and A2 coincide with each other, that is, the theoretical coordinate system A2 under the Catia programming interface coincides with the coordinate system A1 of the pose of the machine tool workpiece.
3. The method for rapid secondary alignment of a numerically controlled milled workpiece as in claim 1, further comprising:
and step 34, measuring the coordinate value of the hole 2 under the A2 coordinate system by using a Catia measuring tool, and contrasting whether the coordinate value measured by the hole 2 is consistent with the coordinate value measured under the A1 coordinate system of the machine tool.
4. A method of numerically controlled milling for the rapid secondary alignment of a workpiece as defined in claim 3 wherein if the "hole 2" coordinate values measured in the a2 coordinate system do not match the coordinate values measured in the a1 coordinate system of the machine tool, the method returns to step 2.
5. The method for rapid secondary alignment of a numerically controlled milled workpiece as in claim 1, wherein the numerically controlled machine tool should be equipped with at least a probe and a measurement system.
6. The method for rapid secondary alignment of a numerically controlled milled workpiece as in claim 1,
in the step 1, the workpiece can be randomly placed within the effective stroke of the numerical control machine tool.
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| EP1764579B1 (en) * | 2005-09-16 | 2007-12-26 | Hexagon Metrology GmbH | Method to Determine the Orthogonality of the Axes of a Coordinate Measuring Machine |
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| CN104526462A (en) * | 2014-12-11 | 2015-04-22 | 长春轨道客车股份有限公司 | Two-time clamping machining workpiece benchmark coincidence method |
| CN105643092A (en) * | 2014-11-13 | 2016-06-08 | 大族激光科技产业集团股份有限公司 | Method for regaining coordinates of workpiece through CCD during combined machining |
| CN108917600A (en) * | 2018-07-05 | 2018-11-30 | 西安交通大学 | A kind of labyrinth blank processing positioning method based on three-dimensional reverse |
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| DE3639461C2 (en) * | 1985-12-23 | 1990-09-06 | Veb Thermometerwerk Geraberg, Ddr 6306 Geraberg, Dd | |
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