JPH065850U - measurement tool - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention provides a measuring instrument for measuring the machine accuracy of a lathe on this machine. [Arrangement] An arm 12 having a semi-circular arc 12a is erected on a mounting stand 11, and a detection value output type length detector is provided at the center of the semi-circular arc 12a and at three positions 90 ° apart from both sides toward the semi-circular arc center. 13a, 13b, 13c are mounted so that they can be adjusted in and out. Without removing the workpiece that was gripped by the lathe chuck and cut into a cylinder under certain cutting conditions, the measuring instrument was attached to the tool post, and two points (a) and (b) were set at a predetermined distance m by the Z-axis control of the tool post. ), The detected values ai, bi, and ci are obtained, and the parallelism of the main axis, the cylindricity, etc. are calculated by the arithmetic circuit.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a measuring tool used for basic machine accuracy measurement in a machine tool, particularly a lathe.

[0002]

[Prior art]

 To perform accuracy inspection on a lathe, attach a test bar 2 to the spindle 1 as shown in Fig. 3 and attach the magnet stand 4 with the dial gauge 3 to the turret 5 of the tool post to test the dial gauge 3 probe. The tool rest is moved in the Z-axis direction while being in contact with the upper and side surfaces of the bar 2, and the straightness of the bed guide surface, the parallelism of the spindle, etc. are inspected by the deflection of the dial gauge 3.

[0003]

[Problems to be solved by the device]

 These accuracies are static accuracies of the machine and are generally inspected after product assembly or at installation in the factory.These accuracies do not always match the machining accuracies of machining by attaching to the spindle chuck in the machining state. However, it may change depending on the cutting conditions, and there is a problem in that it is not possible to obtain measurement accuracy that matches the actual machining conditions. The present invention has been made in view of the above problems of the conventional technique, and its purpose is to provide a measuring instrument for inspecting the basic working accuracy of a workpiece machined on this machine. It is what

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a mounting base to be mounted on a tool rest of a lathe, an arm having a semi-arcuate detector mounting portion provided upright on the mounting base, and a half of the detector mounting portion. The arcuate portion includes two locations facing each other on an axis parallel to the X axis, and a length detector mounted at one intermediate location between the two locations and outputting a detection value.

[0005]

[Function] The cylinder is gripped by the spindle chuck and cut into a cylinder under predetermined conditions, the measuring instrument is attached to the turret, the positions of the length measuring instruments 13a, 13b, and 13c are adjusted and set, and they are separated by a predetermined distance in the Z-axis direction ( (A) and (b) Based on the detection values ai, bi, and ci of the length detectors 13a, 13b, and 13c at the two points, necessary straightness and parallelism of the spindle are calculated.

[0006]

【Example】

 An embodiment of the detector of the present invention will be described below with reference to FIGS. For example, an arm 12 having a semi-circular arc 12a as a length detector mounting portion at its tip is provided upright on a mounting magnet 11 having a magnet attraction function. A detector insertion hole facing the center of the semicircle is formed in the center of the semicircular arc 12a, and detector insertion holes 90 ° apart on both sides of the semicircular arc 12a are formed as opposed holes with their axes aligned on the same line. Length detectors 13a, 13b and 13c are mounted in the individual holes. As this length detector, a commercially available one, for example, an electric micrometer can be used as long as it can detect a unit of μm and can output the detected value as a voltage magnitude to a known arithmetic circuit (not shown). Further, the mounting magnet 11 may not be provided with a magnet attracting function but may be securely fixed by a bolt.

Next, in order to measure the accuracy of the lathe using the measuring instrument, a work piece is held by a chuck of a main spindle, and a work piece is cut into a cylinder under a product processing condition or a condition close thereto, and is used as a test bar. Alternatively, if you want to know the working accuracy under no load, use the one that has been machined into a cylinder under the condition that the cutting resistance is as small as possible and use it as a test bar. , 13b, 13c are retracted so that they do not interfere with each other. The length of the mounting stand 11 of the measuring instrument is attached to the turret 5 with the detector 13b directly above and the half arc 12a as a vertical surface.

At this time, it is necessary to position the tool post by controlling the X axis so that the center of the semi-circular arc 12a substantially coincides with the main axis line. After attaching the measuring device, the length detectors 13a, 13b, 13c are set again and set at almost the center point of the measuring range. This position may be set to the zero point if necessary. Then, the turret is position-controlled to the point (a) (b) separated by a predetermined distance m, and the parallelism and cylindricity of the spindle are calculated in the arithmetic circuit based on the detection data of the length detectors 13a, 13b, 13c at that position. , Roundness, straightness of guide surface and clearance of work piece and cutting edge during machining.

[0009]

[Effect of device]

 As described above, the present invention has the following effects. The machining accuracy can be easily inspected on the machine without removing it after machining, and the change in machining accuracy can be compared when the cutting conditions are changed, so the optimum cutting conditions can be found. Further, the cause of the processing error can be found early. In addition, since no special setup such as a test bar is required, the user can maintain and manage the machine precision.

[Brief description of drawings]

FIG. 1 is an explanatory view of a measuring device of the present invention.

FIG. 2 is a measurement state diagram.

FIG. 3 is a diagram showing a measurement example using a conventional test bar.

[Explanation of symbols]

 11 Mounting Stand 12 Arms 13a, 13b, 13c Length Detector

Claims (1)

[Scope of utility model registration request] 1. A mounting base for mounting on a tool post of a lathe,
An arm having a semi-arcuate detector mounting portion that is erected on the mounting base, two locations facing the semi-circular arc portion of the detector mounting portion on an axis parallel to the X axis, and an intermediate position between the two locations. A measuring instrument comprising a length detector attached to one position and outputting a detection value.