FR2757940A1 - Device for matching precisely to non-perpendicular faces - Google Patents

Abstract

The device which can be positioned on the edge of another object, the edge being formed where two faces coincide at angles greater than 90 degrees. The device comprises a main part (1), in the form of a half cylinder and a secondary part (2), which is a section of a cylinder. The end pieces (3) slot over the first and second parts of the device and provide a device for holding them at a fixed, but variable angle.

Description

The present invention relates to a variable angle geometric edge finder
which is an adjustment and control device used for the mechanical manufacture of
precision (milling, adjustment, EDM) in order to precisely define the location
ment of an edge located on a workpiece or to be checked, the sides of which are not necessarily at right angles and which can be inclined relative to the X or Y-axisymmetric axis (workpiece inclined in a vice).

 This operation is generally done by hiding a line on the workpiece using a trusquin placed on a precision marble, requiring an additional operation for the operator, which generates a loss of time and a lack of precision. .

 This operation can also be done directly on the machine tool using a very expensive three-dimensional probe.

The device according to the invention allows the operator to center on the geometric edge of the workpiece or to control with precision and speed
To use the device, the operator must place it on the part to be machined (or to be checked) so that the two flat faces of the device are placed on the two faces of the part, thus the edge formed by the junction of the two faces of the part corresponds exactly and precisely with the center of the device.

 The device may include two magnets on the faces in contact with the workpiece in order to hold it alone without the aid of the human hand.

 the device will mainly be made of steel in order to have a relatively long lifespan, but several material variants can be envisaged.

The accompanying drawings illustrate the invention
Figure I shows in three dimensions, device of the invention.

In Figure 2 shows an end view of the device.

Figure 3 shows an end view of the part (1).

FIG. 4 represents a front view of the part (1).

 I.n Figure 5 shows an end view of the part (2).

FIG. 6 represents a front view of the part (2).

FIG. 7 represents a side view of the part (3).

Figure 8 shows a front view of the part (3)
FIG. 9 represents an example of use of the device:
The operator can locate exactly the edge formed by the junction of the faces (A) and (B) by pitching on the device (C) with a centralizer (D) sold commercially.

FIG. 10 represents an example of dimension control on a rod on a core (A) of
plastic injection mold: to do so, the adjuster must normally dismantle the mold
and the core in order to do the control, then it has to reassemble the core and the mold, which
represents a duration of approximately four hours of work.

With the device, the adjuster only adjusts to open the mold and directly check
on the core using a caliper (B), which represents approximately ten minutes of
job.

With reference to these drawings, the adjustment and control device comprises a
main part (1) in the form of a half cylinder, a secondary part (2) in the form of a cylinder portion held in place by the part (1) by means of a holding part (3) at each end.

 The main part (1) has a thread (5) and two pin holes (4) at each end to fix the parts (3).

 The secondary part (2) has a relief (7) in the form of an arc of circle each end in order to slide in the two parts (3).

 The parts (3) are strictly identical and each have a light (6) in the form of an arc of a circle where the reliefs (7) of the part (2) fit together.

 The parts (3) also each have a screw passage hole (5) and two pin passage holes (4) in order to be fixed on the part (1).

 A reduced clearance is provided between the part (2) and the two parts (3) so that the part (2) pivots freely.

 According to a variant not illustrated, the outside diameter and the length of the device can vary.

Claims (8)

 1) Adjustment and control device for positioning on a geometric edge formed by the junction of two faces of a part to be machined or to be controlled, characterized in that it comprises a key part (1) in the form of a half cylinder, a part secondary (2) in the form of a cylinder portion and a holding part (3) at each end of the device. 2) Adjustment and control device according to claim 1 characterized in that the centerpiece (1) is in the form of half cylinder cut by the center with precision. 3) Adjustment and control device according to claim 1 characterized in that the centerpiece (1) has a thread (5) and two holes (4) for pins at each end. 4) Adjustment and control device according to claim 1 characterized in that the secondary part (2) in the form of a cylinder portion has a relief (7) in the form of an arc of a circle at each end in order to adapt in the lights (6) of the rooms (3).  5) An adjustment and control device according to claim 1 characterized in that the holding pieces (3) each have a screw passage hole (5) and two pin passage holes (4) in order to be fixed to each end of the part (1).  6) Device according to claim 1 characterized in that the parts (3) each include a light (6) in the form of an arc of a circle in order to receive the reliefs (7) of the part (2). 7) Device according to any one of the preceding claims characterized in that the part (2) pivots freely relative to the center of the device.  8) Device according to any one of the preceding claims characterized in that the part (1) and the part (2) may include a magnet each in order to be pressed on the workpiece or to control to stand alone without help of the human hand.