JP2578447Y2 - Work standard setting device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for setting a working standard for a workpiece used in an NC machine tool or the like.

[0002]

2. Description of the Related Art When machining engine parts such as cylinder heads and the like and other cast workpieces, it is desirable to cut the entirety as uniformly as possible so as not to cause uneven thickness or the like.

[0003] Conventionally, a seat surface on which a workpiece is a processing reference,
Or, in the case where there is a processing standard such as a knock pin hole, the automatic positioning is performed by using an automatic positioning jig, and the automatic processing is performed. In the case of a work that does not have a processing reference capable of automatic positioning or automatic measurement of a surface or a knock pin hole, the work is manually positioned or measured manually to obtain the processing reference.

[0004]

However, in the above-described conventional work reference setting method, since the work measurement and positioning are all performed manually each time, the automatic machining line is unmanned. This is a problem in performing the method, and the work efficiency is remarkably poor, and furthermore, there is a problem that a measurement error and a positioning error are easily generated by a worker, and a thickness deviation due to processing is easily generated.

[0005] The present invention has been made in view of the above-mentioned conventional problems. Even in the case of a work that cannot be machined by an automatic positioning jig, it is possible to use NC holes by using a cast hole.
It is an object of the present invention to provide a workpiece processing reference setting device which enables automatic measurement and automatic processing by a computer.

[0006]

According to the present invention, there is provided a reference bar having a tapered portion formed at one end thereof to be inserted into a cast hole of a work, and a cylindrical portion formed at the other end. A machining reference setting device for a workpiece, comprising: a concentric cylindrical measurement reference cylinder which is fitted and can move relative to the reference bar by its own weight and can stand upright on the workpiece. Things.

[0007]

According to the present invention, when the reference bar and the measuring reference cylinder are placed on the work by inserting a tapered portion into the casting hole, the reference bar and the measuring reference cylinder are attached to the axis of the casting hole by gravity. Will be consistent. Therefore, automatic measurement is performed by the NC using this measurement reference tube as a measurement reference, and automatic processing is performed based on the measured value.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, and FIG. 2 shows an example of a work to which the apparatus of FIG. 1 is applied.
1 shows a case of a cast cylinder head, and three sets of pairs of cast holes 3 for air suction and exhaust for different diameters (the diameter on the air suction side is larger) are formed on the side surface 2 of the work. Is formed.

FIG. 1 shows an apparatus 4 for setting a working standard of a work according to the present invention, wherein the working standard of the work 1 is set by using the above-mentioned cast hole 3. A reference bar 8 having a tapered portion 6 having a thickness corresponding to the portion 5 and a cylindrical portion 7 formed at the other end, and fitted to the cylindrical portion 7 of the reference bar 8 via a fitting surface 9 without any gap. And a concentric cylindrical measurement reference tube 10 capable of moving relative to the reference bar 8 by its own weight.

The tapered portion 6 of the reference bar 8 has a diameter larger than that of the columnar portion, and forms a jaw 11 acting as a stopper at the boundary. A small-diameter portion 13 having a step portion 12 is formed on the side of the column portion 7 opposite to the tapered taper portion 6 (upper side of the column portion 7). A spring 16 having elasticity in the axial direction is provided between the step portion 12 and the ring convex portion 15 in the space portion 14 through the measurement reference tube 10 through the portion 15. Has been inserted. or,
At the end of the small-diameter portion 13, a stopper for preventing the reference bar 8 from slipping out of the measurement reference tube 10 and determining the stroke of relative movement between the reference bar 8 and the measurement reference tube 10 in cooperation with the jaw 11 17 are attached. A space 18 surrounding the jaw 11 of the tapered tapered portion 6 is formed on the tapered tapered portion 6 side of the measurement reference tube 10 .
Therefore, an annular contact portion 19 that can stand upright on the work 1 is formed. The measurement reference tube 10 is provided with the reference bar 8.
And the outer peripheral surface thereof is a position measuring surface 20, and the upper surface on the stopper 17 side is a height measuring surface 2 for measuring the height of the side surface 2 of the work 1.
The length of the measurement reference tube 10 in the axial direction is set accurately so that the measurement reference tube 10 can be set to 1.

FIG. 3 shows another example of the shape of the tapered portion 6. In order to increase the accuracy of insertion of the tapered portion 6 into the cast hole 3, a tapered surface 180 is provided.
The tapered arc surface 22 is formed by cutting out the other portions while leaving the degree position, so that the position where it can be inserted deepest into the cast hole 3 can be selected.

Next, the operation will be described.

When measuring and positioning the work 1 shown in FIG. 2, the work 1 is fixed so that the side surface 2 having the cast hole 3 faces upward, and then the reference bar 8 is inserted into the cast hole 3. The reference bar 8 and the measurement reference tube 10 are placed on the workpiece 1 so that the tapered portion 6 is inserted. Then, due to the gravity of the reference bar 8, the tapered tapered portion 6 becomes the cast hole 3.
And the measurement reference cylinder 10 stands upright on the upper surface of the workpiece 1 by the annular contact portion 19 at the same time as the center of the cast hole 3. Positioned precisely on the heart.

As described above, the processing reference setting device 4 can be used as a measurement reference by being placed on one workpiece only in correspondence with the cast hole 3 so as to coincide with the axis of the cast hole 3. Therefore, handling can be made very simple. If the tapered arc surface 22 is formed in the tapered tapered portion 6 as shown in FIG. 3, even if the cast hole 3 is distorted or there is a convex portion due to foreign matter, the reference bar 8 is turned to form the casting. By inserting it into the hole 3, it is possible to stabilize it at the position where it is inserted deepest, so that a more accurate position setting can be performed.

FIG. 4 and FIG.
As shown in the figure, the distance between the measurement reference cylinder 10 at the C position with respect to the position measurement surface 20 of the measurement reference cylinder 10 of the processing reference setting device 4 at the A position by the NC is set. , The basic axis XX is calculated by measuring the height measurement surface 12 of the measurement reference cylinder 10 at the A and C positions and calculating the inclination, and further measuring the measurement reference cylinder 10 at the B position. With this addition, the inclination of the side surface 2 in the direction perpendicular to the paper surface in FIG. 5 is calculated, and the coordinates of the side surface 2 of the work 1 and the casting hole 3 are obtained. Therefore, automatic processing can be performed by the NC processing machine based on the determined coordinates of the side surface 2 and the cast hole 3.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the scope of the present invention.

[0018]

According to the work reference setting device of the present invention, even in a cast work in which the processing reference cannot be taken by the automatic positioning jig, the tapered tip portion is inserted into the cast hole. By simply placing the reference bar and the measurement reference tube on the workpiece, the measurement reference tube can be accurately aligned with the axis of the cast-out hole. Therefore, automatic measurement is performed by NC using the measurement reference tube as the measurement reference. An excellent effect capable of performing automatic processing can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is a perspective view showing an example of a work.

FIG. 3 is a bottom view showing another example of the tapered portion of FIG. 1;

FIG. 4 is a plan view illustrating an example of measuring a workpiece using the processing reference setting device of the present invention.

FIG. 5 is a view taken in the direction of arrows VV in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Work 3 Cast-out hole 6 Tapered taper part 7 Cylindrical part 8 Reference bar 10 Measurement reference cylinder

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Sasaki 3-1-1, Nihonbashi Muromachi, Chuo-ku, Tokyo Mitsui Seiki Kogyo Co., Ltd. Sho 56-94242 (JP, U) Actual opening Sho 55-575034 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B23Q 17/22 B23Q 17/00

Claims (1)

(57) [Scope of request for utility model registration] 1. A reference bar having at one end a tapered tapered portion to be inserted into a cast hole of a work, and a cylindrical portion formed at the other end. Can move relative to the bar and vertically on the work
And a concentric cylindrical measurement reference tube capable of standing upright .