JP5192794B2 - Dimension standard for NC machine - Google Patents

Description

  The present invention relates to a dimensional standard for an NC processing machine for inspecting an instruction error of a feeding device of a processing machine such as a lathe, a milling machine, or a machining center equipped with an NC apparatus.

  Various machine tools, press machines, etc. (hereinafter collectively referred to as NC machines) that perform machining by controlling the workpiece feed by an NC (Numerical Control) device are the actual feed amounts of a feed mechanism such as a ball screw. However, an error may occur with respect to the input command value, and in order to maintain the machining accuracy of the workpiece, it is necessary to perform an error inspection at the start of use or every time a certain usage time elapses.

Therefore, in the prior art, for example, as shown in Patent Document 1, a master work in which a reference hole is provided and dimensional accuracy is ensured is moved by a feeding means of a processing machine, and the reference hole is moved to the processing machine. A technique has been proposed in which an error of an actual movement amount with respect to a command value is detected by a sensor provided at a fixed position and evaluated.
JP 2001-225126 A

  Like the master workpiece described in Patent Document 1, the dimensional standard device that serves as a reference for the workpiece feed amount has a problem that errors due to its own thermal expansion increase as the measurement length increases. In particular, in a processing machine with a large feed table feed stroke, such as a large NC machine tool, the size standard used for inspection of the feed amount indication error is long, so the temperature of the measurement environment is affected. It has become large, and it has been difficult for the user himself to carry out an error inspection of the feed amount of the processing machine at a site such as a manufacturing factory with high accuracy.

  Therefore, the present invention solves the problems of the prior art as described above, and can be used for an NC processing machine that can easily and accurately inspect the instruction error of the feeding device of the NC processing machine at a site such as a manufacturing factory. An object is to provide a dimensional standard.

  In order to achieve the above-mentioned object, a dimensional standard for NC processing machine according to the present invention includes a long and narrow rod-like rod formed of quartz glass or single crystal quartz, and a predetermined interval in the axial direction of the rod. A pair of mounting shafts fixed so as to protrude vertically from the outer peripheral surface of the rod in the same direction, and a pair of reference members made of invariant steel fixed to both ends of the rod, Each of these reference members is formed with two reference measurement surfaces facing each other at a predetermined interval in the axial direction of the rod.

  It is desirable that the pair of mounting shafts protrude vertically from a flat surface formed on a part of the outer peripheral surface of the rod and parallel to the axial direction of the rod. In addition, it is also desirable that one of the outer peripheral surfaces of the portions of the pair of mounting shafts that protrude to the outside of the rod is formed in a simple columnar shape, and the other is formed in a deformed columnar shape having a front and rear width narrower than the left and right width.

  According to the first aspect of the present invention, the pair of reference members made of invariant steel are provided at both ends of an elongated round rod-shaped rod formed of quartz glass or single crystal quartz that hardly deforms due to temperature change. Each of these reference members has a structure in which two reference measurement surfaces facing each other at a predetermined interval in the axial direction of the rod are formed. Therefore, even when the rod is long, it has high dimensional accuracy against changes in ambient temperature. Therefore, even in an NC processing machine with a large amount of movement of the feed table on which the workpiece is placed, it is possible to easily and accurately inspect the indication error of the feeder.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, the pair of mounting shafts are formed on a part of the outer peripheral surface of the rod and are parallel to the axial direction of the rod. Since the structure projects vertically from the flat surface, the rod can be stably held on the upper surface of a dedicated jig attached to the feed table or the upper surface of the feed table.

  Further, according to the invention described in claim 3, in addition to the effects of the invention described in claim 1 or 2, one of the outer peripheral surfaces of the portions of the pair of mounting shafts protruding to the outside of the rod is simple. Since it is formed in a columnar shape and the other is formed in a deformed column shape whose width in the front and rear is narrower than the left and right width, the center interval of these mounting shafts and the position of the upper surface of the dedicated jig etc. facing these mounting shafts Even if there is a manufacturing error between the center distances of the mounting holes formed on the front and rear, the front and rear width of the mounting shaft is smaller than the inner diameter of the mounting hole. Therefore, it is possible to easily attach the dimension standard to a dedicated jig.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing an embodiment of a dimensional standard device for NC processing machine (hereinafter simply referred to as a dimensional standard device) according to the present invention, and FIG. 2 is a bottom view thereof. 3 is a cross-sectional view thereof, wherein (a) shows the AA cross section of FIG. 1, and (b) shows the BB cross section.

  As shown in these drawings, the dimensional standard device 1 of the present invention has an elongated round rod-like rod 2. The rod 2 is manufactured by cutting out from a single lump of quartz glass or single crystal quartz that hardly changes in dimensions due to temperature changes in the environment. The rod 2 is manufactured in various lengths according to the maximum stroke of the feeding device of the NC processing machine to be inspected.

  As shown in FIGS. 2 and 3, in the present embodiment, a flat portion having a uniform width parallel to the axial direction of the rod 2 is formed on a part of the lower portion of the outer peripheral surface over the entire length of the rod 2. Surface 2A is configured. A pair of shaft holes 2B and 2C are formed at a central portion of the flat surface 2A at a predetermined interval in the axial direction of the rod 2.

  The small diameter portions 3A and 4A of the mounting shafts 3 and 4 are fitted into the shaft holes 2B and 2C, respectively, and are bonded to the rod 2 with an adhesive. In the portions of these mounting shafts 3 and 4 that protrude perpendicularly from the flat surface 2A, one mounting shaft 3 is formed in a simple columnar shape, whereas the other mounting shaft 4 is larger than the left and right width. It is formed in an irregular column shape with a narrow front-rear width. Here, the axial direction of the rod 2 is the front-rear direction.

  Further, in the present embodiment, chromium molybdenum steel (SCM21) is used as the material of the mounting shafts 3 and 4. However, the present invention is not limited to this. For example, an industry with high shape accuracy and high wear resistance. You may use what shape | molded and processed the plastics material.

  Reference members 5 having the same structure are attached to both ends of the rod 2. These reference members 5 are made of invariant steel, and as shown in FIG. 4, a portion exposed to the outside of the rod 2 is a rectangular parallelepiped shape, and a square hole penetrating the upper surface and the lower surface is formed in the center portion thereof. 5A is formed.

  The inner wall surface of the square hole 5A is finished with high accuracy, and two surfaces S1 and S2 facing the axial direction of the rod 2 are used as reference measurement surfaces, respectively. Further, these reference members 5 are fixed with an adhesive by fitting cylindrical shaft portions 5B into mounting holes (not shown) formed on both end faces of the rod 2, respectively.

  Next, one embodiment of the dimensional standard device 1 configured as described above will be described. FIG. 5 shows a state in which the dimensional standard device 1 configured as described above is set on an NC processing machine for inspecting, and FIG. 6 shows a CC cross section of FIG.

  In these drawings, A1 is a feed table of the NC processing machine, and a plurality of T grooves A2 are provided in parallel on the feed table A1. These T-grooves A2 are normally used for attaching a workpiece clamp, and can also be used when the dimensional standard 1 is set on the feed table A1.

  Here, the dimensional standard device 1 is set on the feed table A1 through a dedicated jig A3 attached to the T groove A2. As shown in FIG. 6, a protrusion A4 that fits in the T groove A2 is provided on the lower surface of the dedicated jig A3, and a stepped bolt hole A5 that penetrates vertically is provided with a hexagonal hole. The special jig A3 is fastened and fixed on the feed table A1 by screwing it into the receiving nut A7 inserted into the T groove A2 of the feed table A1 through the bolt A6.

  As shown in FIG. 5, a pair of mounting holes A8 and A9 for inserting the mounting shafts 3 and 4 of the dimensional standard device 1 are formed on both sides of the bolt hole A5 of the dedicated jig A3. By fitting the mounting shafts 3 and 4 into the mounting holes A8 and A9, respectively, the flat surface 2A of the lower part of the rod 2 of the dimensional standard 1 is held in contact with the flatly finished upper surface of the mounting jig A3. .

  At this time, even if there is a manufacturing error between the center distance between the mounting shafts 3 and 4 of the dimensional standard 1 and the center distance between the mounting holes A8 and A9 of the dedicated jig A3, the front and rear width of the mounting shaft 4 is the mounting hole. Since the width of the mounting shaft 4 is smaller than the inner diameter of A9 and the right and left width of the mounting shaft 4 is made to fit the inner diameter of the mounting hole A9, a dimensional standard device can be easily and easily attached to the dedicated jig A3.

  When the dimensional standard device 1 is set on the feed table A1 in this way, the position of the feed table A1 is moved to the right end side in FIG. 5, and the contact sensor A11 attached to a fixed portion (not shown) of the NC processing machine. As shown in the figure, the tip of the probe A12 is inserted into the square hole 5A of the reference member 5 of the dimensional standard 1, and then the feed table A1 is moved so that the tip of the probe 12 becomes the reference measurement surface S1 and the reference The coordinate value of the center position of the square hole 5A is obtained from each coordinate value displayed on the NC processing machine in contact with each of the measurement surfaces S2.

  Next, the probe A12 is lifted upward from the square hole 5A, the feed table A1 is moved to the left in FIG. 5, and the probe 12 is positioned immediately above the square hole 5A of the reference member 5 on the right side of the dimension standard 1. Let Here, the probe 12 is inserted into the square hole 5A, and the coordinate value of the center position of the square hole 5A is similarly obtained, and the difference between the two coordinate values is compared with the reference value of the dimension reference unit 1. Thus, an instruction error of the feeding device of the NC machine can be obtained. Here, the reference value of the dimension standard 1 is a known value obtained by measuring the distance between the center positions of the square holes 5A of the respective reference members 5 provided at both ends of the rod 2 with a high-precision measuring machine. Is the value of

  In the embodiment described above, as shown in FIGS. 5 and 6, the dimensional standard 1 is set on the feed table A1 using the dedicated jig A3. However, the dimensional standard 1 is heavy. In this case, since there is little possibility that the position is shifted even if it is placed directly on the feed table A1, the pair of mounting shafts 3 and 4 of the dimensional standard device 1 are inserted into the T-groove A2 of the feed table A1. Place the rod 2 on the upper surface of the feed table A1 so that the same side surface of the mounting shafts 3 and 4 is brought into contact with the edge of one side of the T-slot A2 and the axial direction of the rod 2 is parallel to the feed direction of the feed table A1. Can also be used.

  Next, FIG. 7 is a side view showing another embodiment of the dimensional standard device of the present invention. The dimensional standard device 1A shown in FIG. The angle hole 5A of the reference member 5 is attached in the horizontal direction, and the components are the same as those of the dimension standard 1 described above. The dimension reference device 1A shown in the figure can be used when it is necessary to mount the contact sensor with the probe facing sideways due to the structure of the NC processing machine.

  In the above-described embodiment, the flat surface 2A is formed on the rod 2 and the mounting shafts 3 and 4 are projected from the flat surface 2A. However, the rod 2 is completely formed without forming the flat surface 2A. You may form in a round bar shape. However, in this case, since the dimension reference device 1 cannot be directly placed on the feed table A1, it is necessary to hold it with a dedicated jig.

  Further, the rod 2 may be formed in a hollow pipe shape in order to increase the bending strength without increasing the weight. Furthermore, the shape of the reference member 5 provided at both ends of the rod 2 is not limited to that of the above-described embodiment in which the square hole 5A is formed, but at least the contact facing the axial direction of the rod 2 What is necessary is just to provide the two reference | standard measurement surfaces S1 and S2 with which the probe of a sensor can contact | abut.

  The NC machine tool size standard of the present invention of the present invention can be used when inspecting a feed amount indication error in a feed device of an NC machine such as a lathe, a milling machine, or a machining center having an NC device.

It is a side view of the dimension standard for NC processing machine of this invention. It is a bottom view of the dimensional standard for NC processing machines of the present invention. It is a cross-sectional view of the dimensional standard device for NC processing machine of this invention, (a) shows the AA cross section in FIG. 1, (b) shows the BB cross section in FIG. It is a perspective view of the reference member provided in the dimensional standard for NC processing machine of the present invention. It is a figure which shows the state set to the feed table of the dimension standard machine for NC processing machines of this invention. FIG. 6 is a cross-sectional view showing a CC cross section of FIG. 5. It is a side view which shows another embodiment of the dimension standard device for NC processing machines of this invention.

Explanation of symbols

1, 1A Dimension Standard 2 Rod 2A Flat Surface 2B, 2C Shaft Hole 3, 4 Mounting Shaft 3A, 4A Small Diameter
5 Reference member 5A Square hole 5B Shaft portion S1, S2 Reference measurement surface

Claims (3)

An elongated round rod-shaped rod made of quartz glass or single crystal quartz;
A pair of mounting shafts fixed so as to protrude vertically from the outer peripheral surface of the rod in the same direction at a predetermined interval in the axial direction of the rod;
A pair of reference members made of invariant steel, each fixed to both ends of the rod;
Each of these reference members is formed with two reference measurement surfaces facing each other at a predetermined interval in the axial direction of the rod.   2. The NC machine tool dimensional standard according to claim 1, wherein the pair of mounting shafts protrudes vertically from a flat surface formed in a part of the outer peripheral surface of the rod and parallel to the axial direction of the rod. vessel.   One of the outer peripheral surfaces of the portion of the pair of mounting shafts protruding to the outside of the rod is formed in a simple columnar shape, and the other is formed in a deformed columnar shape whose front-rear width is narrower than the left-right width. Item 1 or 2 dimensional standard for NC machines.

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