Geometrical instruments – Gauge – With support for gauged article
Patent
1998-03-31
2000-07-18
Gutierrez, Diego
Geometrical instruments
Gauge
With support for gauged article
33550, G01B 520
Patent
active
060889241
DESCRIPTION:
BRIEF SUMMARY
The present invention relates essentially, but not exclusively, to inspecting the diameter dimension of crank pins while they are being ground.
BACKGROUND OF THE INVENTION
A device for performing that type of inspection is known, in particular from document (FR 2 567 058). However, the means that it implements suffer from major drawbacks in applications where machining time constitutes a non-negligible factor in the cost price of the pieces being machined. With the known device it is necessary to stop the crank shaft rotating and to put the apparatus manually into contact with the crank pin that is to be inspected. Even if the operation of putting the inspection apparatus into contact with the crank pin were to be automated, and likewise the taking out of contact thereof, it would still be necessary to stop the rotating crank shaft in a determined angular position. That known apparatus therefore gives rise to a loss of productivity when grinding crank pins.
OBJECTS AND SUMMARY OF THE INVENTION
To mitigate that drawback, the invention provides a device for measuring and/or inspecting the diameter of a cylindrical piece in orbital motion about an axis while it is being ground, the device comprising a measurement head coupled to a support, which support is fitted with a member for bearing against the periphery of the piece and is mounted to move parallel to itself on a frame so as to be able to accompany the orbital motion of the piece; grinding being performed by means of a tool that is movable transversely relative to said axis, the frame being mounted to move transversely relative to said axis with motion that is synchronized with the motion of the tool.
It will be understood that by synchronizing the motion of the measuring instrument frame with the motion of the tool, the measuring instrument, or more exactly the member whereby its support bears against the piece, is placed in a frame of reference in which the orbital motion is reduced to simpler motion that includes, in particular, a reversing point at which the speed of the piece becomes zero, which point is favorable for making contact with the bearing member.
Preferably, the moving tool is carried by a carriage and the frame of the device is coupled to the carriage. That is the simplest manner of synchronizing the motion of the frame with the motion of the tool.
BRIEF DESCRIPTION OF THE DRAWINGS
Other characteristics and advantages of the invention appear from the description of an embodiment given below.
Reference is made to the accompanying drawings, in which:
FIG. 1 is a diagrammatic view of a measurement device of the invention associated with a grinder tool;
FIG. 2 is a view along F in FIG. 1;
FIG. 3 is a diagrammatic view of a first variant embodiment of the device shown in FIG. 1; and
FIG. 4 is a diagrammatic view of a second variant embodiment of the device of the invention.
MORE DETAILED DESCRIPTION
In the examples described below, the invention is applied to using a wheel 1 to grind a crank pin 2 of a crank shaft whose axis of rotation is referenced 3 in the figures. The axis of rotation 3 of the crank shaft is held relative to the frame of the machine (not shown), and the pin 2 describes orbital motion about said axis 3 as symbolized by the circle 4 described by the center of the pin 2.
The grindwheel 1 is mounted to rotate about an axis 5 carried by a carriage 6 which moves with reciprocating motion AB orthogonally to the axis 3. The angular position of the pin 2 relative to the axis 3 and the position of the axis 5 relative to the axis 3 are servo-controlled as a function of a determined grinding program.
The diameter of the pin is inspected in conventional manner by a measurement head 7 which possesses feelers at the end of a fork 7a serving to deliver a signal representative of the diameter of the pin 2. The measurement head is known per se and is available on the market.
The invention relates to the device for holding the head, which device is designed to make it as simple as possible to put the head into operation and to
REFERENCES:
patent: 1941456 (1934-01-01), Arnold
patent: 4414748 (1983-11-01), Gauler et al.
patent: 4429464 (1984-02-01), Burrus
patent: 4625413 (1986-12-01), Possati et al.
patent: 4637144 (1987-01-01), Schaudt
patent: 4958442 (1990-09-01), Eckhardt
patent: 5086569 (1992-02-01), Possati et al.
patent: 5150545 (1992-09-01), Meseltron
Etamic SA
Fernandez Maria
Gutierrez Diego
LandOfFree
Machine for grinding a cylindrical piece in orbital motion does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Machine for grinding a cylindrical piece in orbital motion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Machine for grinding a cylindrical piece in orbital motion will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2024229