JPH0625709U - Tapered precision measuring instrument - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a precision measuring instrument capable of easily and highly accurately measuring the outer diameter accuracy of a taper shaft. [Structure] 2 on the frame 2 whose end view is C or U-shaped
Install the dial gauges 3 in parallel. In addition, the contact 3a of each gauge is aligned with the stator 4 in the axial direction of the frame.
Two are provided at each measurement point. The measuring instrument 1 is preset according to the reference taper axis set in the holder 6, the measured taper axis A is attached to the holder 6, and comparative measurement with the reference taper axis is performed in the state of the drawing. With this, it is possible to judge whether the taper gradient is good or bad by comparing the deflection amounts of the needles of the two gauges with the taper shaft attached to the holder of the processing machine, and the measurement is simple and accurate.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a taper precision measuring device capable of easily and highly accurately measuring the outer diameter of a taper shaft provided in a machine part or a tool.

[0002]

[Prior art]

 The taper shank provided on rotary cutting tools such as drills, reamers, and end mills, and holders for these types of tools requires high accuracy in terms of centering accuracy and gripping stability during use. Therefore, we use a taper gauge with a standard taper hole to check the accuracy of the outer diameter, and if there is a tight gauge fitting part, further cut this part to finish.

[0003]

[Problems to be solved by the device]

 Measurement with a taper gauge requires that the taper shank during processing be removed from the processing machine once, and if the accuracy is poor, workability is extremely poor because the tool is set again and repeated for processing and measurement. Therefore, it takes a lot of time and labor especially when processing a large-diameter shank with a large weight that requires a lifting tool for setting and removing. In addition, if the taper axis to be measured is long, it is difficult to identify the part where the tolerance is exceeded (the part where the fit is tight), and skill is required for the work.

Further, since it is unavoidable to judge how much the allowable error is exceeded, it is necessary to repeat the measurement and the shaving, and the workability is poor.

Further, the plus error from the reference value can be known by the tightness of fitting of the gauge, but it is not known how much the minus error exists.

Although a specific value of the outer diameter error can be measured with a dial snap gauge or the like, since the outer diameter of the taper shaft changes in the axial direction, the measurement in this case is performed by setting some measurement points. It is necessary to measure the outer diameter of each point using a gauge that matches the reference value of each point, which makes the work extremely complicated. In addition, existing dial snap gauges, etc. do not guarantee the measurement at the correct measurement point (when the taper shank is set on the processing machine, it is almost impossible to provide the measurement point inside the processing machine). The measured result will be incorrect due to the axial deviation between the measured point and the actual measured point.

An object of the present invention is to provide a taper precision measuring instrument which solves these problems.

[0008]

[Means for Solving the Problems]

 The taper precision measuring instrument of the present invention which solves the above-mentioned problems has a C or U-shaped frame as viewed from the end, and has n (≧ 2) dial gauges at predetermined intervals in the longitudinal direction of the frame, and , The contacts of each gauge are installed in parallel toward the setting center of the taper shaft to be measured, and two outer peripheral taper surfaces of the taper shaft are supported at positions displaced in the circumferential direction from the contact points of the contacts. The stator and an adjusting mechanism for moving the respective stators back and forth toward the center of the setting are provided.

[0009]

[Action]

 First, the taper shaft that serves as the reference for measurement is axially positioned and set in the holder. Then, fit the measuring device of the present invention to this reference taper shaft from the side so that the taper shaft fits in the groove of the frame and put one end of the frame against the tip of the holder.In this state, the contacts of each stator and each dial gauge are Adjust the position of the stator and contact so that the needle of each gauge is in contact with the outer circumference of the taper shaft and points the scale zero. After that, remove the measuring instrument, remove the reference taper shaft from the holder, and attach the taper shaft to be measured to this holder by axially positioning it on the same reference plane as when setting the reference taper shaft.

Next, the adjusted measuring device is laterally fitted to the outside of the taper shaft to be measured, and one end of the frame is brought into contact with the tip of the holder to bring each stator and each contactor into contact with the outer circumference of the taper shaft.

As described above, the measured taper axis is positioned at the setting center under the same conditions as the reference taper axis. Therefore, if the deflection of the needle of each gauge at this time is read, the outer diameter of the measured taper axis can be read. You can see how much the error (the error compared with the standard taper axis) is.

Further, whether or not the taper gradient of the taper surface is correct can be determined from the presence or absence of the deflection of the needle of each dial gauge, and the degree of deviation of the gradient can be determined from the magnitude of the difference in the deflection. Therefore, based on this measured value, the taper shaft can be measured while it is still set in the processing machine, and the processing can be repeated to correct the error, and high-precision finishing of the taper shaft becomes easy and reliable.

[0013]

【Example】

 1 and 2 show an example of the measuring device of this invention. As shown in the figure, the measuring instrument 1 includes a frame 2, two dial gauges 3 mounted in parallel on the frame at a constant interval in the frame axial direction, and a contactor of each gauge at a position in the frame axial direction. Two of them, which are attached to the frame in alignment with the installation points, are composed of a set of stators 4 and an adjusting mechanism 5 that changes the tip position of each stator. The frame 2 has a C-shaped end view so as to receive the taper axis A from the side in the groove 2a, and further, a supporting portion 2b extending in the radial direction is continuously provided at one end in the circumferential direction. The dial gauge 3 is attached there.

Although the dial gauge 3 is a commercially available product having two needles, it is not limited to this. The contact 3a of this gauge faces the inside of the groove 2a so that the setting center C of the tapered shaft is located on the extension of the shaft center.

Further, the stator 4 is arranged such that one of the two paired stators faces the contactor 3a across the setting center C, and the outer diameter error of the taper axis A measured by a gauge is actual. It seems to appear in size. In the figure, the other stator 4 is at a position displaced by 90 ° in the circumferential direction from both one stator and the contactor 3a. It does not matter if it is biased to some extent.

The adjusting mechanism 5 forms a male screw on the outer circumference of the stator 4, and screw this into a screw hole provided in the frame 2 to adjust the screwing amount to adjust the distance from the setting center C to the tip of the stator. This is a well-known mechanism for changing and then tightening the lock nut 5a to hold the adjustment position.

The stator 4 may be as shown in FIG. Also in this case, when one surface of the V groove is opposed to the contactor 3a from the front and the position is adjusted so as to advance and retreat in the direction of the bisector of the groove angle, the taper axis A is positioned at the setting center and is supported at two points. It is possible, and the error display by the gauge also becomes the actual size display.

[0018] Here, among the support points S _1, S ₂ in FIG. 2 and 3, the display value of the gauge when _a point S is shifted in the circumferential direction from the position of figure not to scale. However, since the measuring instrument of this invention performs comparative measurement with the reference taper axis, it is possible to know whether the error is within the allowable value, even if it is not the actual size display. Therefore, point S _{1 is} set at the position shown in the figure. It is not mandatory to set it.

Reference numeral 6 in the drawing denotes a holder having a taper axis A. This holder is a holder installed on a taper shaft processing machine. The reference taper shaft is set in this holder, and one end of the frame 2 is brought into contact with the tip of the holder as shown in FIG. 1 to adjust the positions of the stator 4 and the contactor 3a so that the needle of the dial gauge 3 shows zero of the scale. To do.

Next, the reference taper shaft is removed, and the measured taper shaft is axially positioned and attached to the holder 6 under the same conditions as the reference taper shaft, and the adjusted measuring instrument 1 measures the outer diameter. As shown in FIG. 1, the measurement is carried out by applying one end of the frame 2 to the tip of the holder, so that the measurement point is not displaced in the axial direction and can be accurately measured. Also, if it is found in this measurement that the machining is incomplete, the measuring instrument is removed, the taper axis is set in the holder A, the machining is repeated, and the measurement is repeated. If the frame 2 is provided with a grip for attaching and detaching the measuring device, the work is easy.

Since the taper gradient of the taper shaft is constant at each part in the axial direction, only two dial gauges are required. If you confirm that the two gauges have the same taper slope and that the outer diameters of the two measurement points are within the tolerance, it means that the other parts are finished within the tolerance.

[0022]

[Effect of device]

 As described above, in the measuring instrument of this invention, n (≧ 2) dial gauges are coaxially arranged side by side in a frame, and these gauges are used to measure the outer diameter error of the n points. At the same time as the measurement, the quality of the taper gradient can be judged by comparing the error at each point, so that one end of the frame can be applied to the tip of the holder to prevent the measurement point from shifting in the axial direction. The quality of the finished taper shaft can be easily and accurately determined with one measurement. Moreover, the work can be performed with the taper shaft set in the machine, which leads to high-precision machining of the taper shaft and improvement of machining efficiency.

[Brief description of drawings]

FIG. 1 is a front view showing an example of a measuring device of the present invention.

FIG. 2 is a side view of the above.

FIG. 3 is a diagram showing another example of a stator.

[Explanation of symbols]

 1 Measuring instrument 2 Frame 2a Groove 2b Support part 3 Dial gauge 3a Contactor 4 Stator 5 Adjust mechanism 5a Lock nut A Taper axis C Setting center

Claims (1)

[Scope of utility model registration request] 1. A frame having a C or U-shaped end view,
n (≧ 2) dial gauges are arranged at a predetermined interval in the longitudinal direction of the frame, and the contactors of each gauge are mounted in parallel toward the setting center of the taper shaft to be measured. A taper precision measuring instrument comprising a stator for supporting two outer peripheral taper surfaces of the taper shaft at a position deviated in the circumferential direction from a point, and an adjusting mechanism for advancing and retracting each stator toward and from the setting center.