CN101566462A

CN101566462A - Measuring method of virtual clamp

Info

Publication number: CN101566462A
Application number: CNA2009100399608A
Authority: CN
Inventors: 徐春云
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-05-31
Filing date: 2009-05-31
Publication date: 2009-10-28

Abstract

The invention relates to the technical field of measurement, in particular to a measurement method of a photoelectric instrument. The method comprises the following steps: 1) putting one of the workpieces on a workbench, fixing the workpiece, then using a lens to randomly grab two lines on the workpiece, inputting the two lines into a computer to form a datum line on a computer measuring plane, namely forming a virtual clamp; 2) placing another workpiece to be measured on a workbench, aligning a reference line on the formed measuring plane to a corresponding line on the workpiece, and correspondingly moving and/or rotating the reference line on the measuring plane to form an upper clamping of the virtual clamp; 3) and moving and grabbing points or lines on the workpiece by utilizing the position relation between the virtual focus of the measuring lens on the measuring plane and the reference line, so that the measurement can be carried out. The invention has the advantages of convenient operation, high measuring speed and high accuracy, reduces error measurement, improves the measuring efficiency, reduces the influence of a clamp on the workbench on the workpiece, has low requirement on positioning the workpiece on the workbench, and reduces mechanical errors.

Description

The measuring method of virtual clamp

Technical field:

The present invention relates to field of measuring technique, refer in particular to a kind of measuring method of photoelectric instrument.

Background technology:

Along with development of science and technology, the precision positioning measurement has been proposed more and more higher requirement, thereby traditional vernier caliper or spiral measuring instrument are difficult to satisfy measurement requirement.Photoelectric measurement appears subsequently, utilizing image to seize device (as CCD) is electronic signal with the video conversion of measured object, electronic signal is delivered to computer again, picture processing chip by computer is shown enlarged in image on the display, utilize corresponding seizure of computer three-dimensional coordinate to measure again, this mode can reduce measuring error, promotes measuring accuracy.But existing photoelectric measurement instrument, mainly be to move by the measurement camera lens to catch measurement, owing to lack mobile guide, often occur grasping less than or grab wrong phenomenon, especially position and lean on nearerly each other or some position when being in the edge of work, camera lens is difficult to accurately seizure, make to measure and seem comparatively bothersome, also very difficult moving lens exactly puts in place, greatly influences efficiency of measurement, brings inconvenience to measurement.

Summary of the invention:

The object of the present invention is to provide a kind of measuring method of virtual clamp, it is easy to operate, and measurement is accurate, speed is fast.

For achieving the above object, the present invention adopts following technical scheme to realize:

The measuring method of virtual clamp comprises the steps:

1), one of them workpiece is put worktable, utilize two lines on any grabbing workpiece of camera lens after fixing, the input computer constitutes the datum line on the computer measurement plane, promptly forms a virtual clamp;

2), another measured workpiece is put worktable, remove to aim at homologous lines on this workpiece with the datum line on the established measurement plane, at this moment the datum line on the measurement plane is done and is correspondingly moved and/or rotate, and forms the upper clamping of virtual clamp;

3), position that utilize to measure the virtual focus point of camera lens on measurement plane and datum line concerns that point or line on the mobile grabbing workpiece can be measured.

Measuring method provided by the present invention is to be to construct earlier datum line on measurement plane, with corresponding solid line on this datum line alignment pieces, clamp workpiece, like this, workpiece is relative fixed in the coordinate system of measurement plane, and then the virtual focus point of camera lens on measurement plane and the position relation of datum line are measured in utilization, point or line on the mobile grabbing workpiece, the accuracy height that moves and catch reduces mistake and surveys, and promotes measuring speed and efficient, also reduce simultaneously on the worktable anchor clamps to the influence of workpiece, not high to workpiece positioning requirements on worktable, handled easily reduces machine error.

The present invention measures as face profile applicable to plane, measurement in space, and concentricity is measured, three-dimensional inclined-plane and cambered surface measurement etc., and wide application effectively promotes the development of measuring technique.

Embodiment:

Virtual clamp measuring method provided by the invention comprises the steps:

During enforcement, on measurement plane, constructed datum line before this, this datum line is to obtain by two lines on any grabbing workpiece of camera lens, during operation one of them workpiece is put worktable, utilize two lines on any grabbing workpiece of camera lens after fixing, as two sidelines or center line etc., the input computer, constitute the datum line on the computer measurement plane, promptly form a virtual clamp; Aim at corresponding solid line on another measured workpiece with this datum line then, at this moment the datum line on the measurement plane is done corresponding moving and/or rotation, can control by system program, forms the upper clamping of virtual clamp; Like this, workpiece is relative fixed in the coordinate system of measurement plane, with the workpiece calibration position basically identical of determining before.And then the virtual focus point of camera lens on measurement plane and the position relation of datum line are measured in utilization, point or line on the mobile grabbing workpiece, no matter the accuracy height that moves and catch is medium line, position, limit, all is easy to grasp, and matching computer is measured, reducing mistake surveys, promote measuring speed and efficient, the present invention can reduce on the worktable anchor clamps to the influence of workpiece calibration, and is not high to workpiece positioning requirements on worktable, handled easily reduces machine error.

Claims

1. The measuring method of the virtual fixture, which cooperates with the photoelectric measuring instrument, is characterized in that: comprising the following steps:

1) Put one of the workpieces on the workbench, and after fixing, use the lens to grab two lines on the workpiece arbitrarily, and input them into the computer to form the reference line on the computer measurement plane, that is, to form a virtual fixture;

2) Put another workpiece to be measured on the workbench, and align the corresponding line on the workpiece with the reference line on the measurement plane that has been formed. At this time, the reference line on the measurement plane moves and/or rotates accordingly, Form the upper clamping of the virtual fixture;

3) Using the positional relationship between the virtual focus of the measuring lens on the measuring plane and the reference line, move and grab the point or line on the workpiece to measure.