JPS61235704A - Electric capacitive roughness gauge - Google Patents

Abstract

PURPOSE:To use an electric capacitive roughness gauge even when maximum height or '+' point mean roughness is employed by finding roughness values of two masters by a probe type roughness gauge and inputting those numerals to a display unit. CONSTITUTION:Two masters which has a proper interval between roughness values are used and roughness values are measured by the probe type roughness gauge; a fine value is denoted as Rm1 and a rough value is denoted as Rm2. Then, the roughness value Rm1 is set in a sum wheel switch 1 and then displayed on the digital display panel 3 while the electrode surface of a roughness detection probe is pressed against the fine roughness master surface. Then, the electrode surface is pressed against the rough master surface to display its roughness on the panel 3 and the Rm2 is displayed while matched with the roughness value of the master by a potentiometer 5. This operation stores R values corresponding to electric capacities Cm1 and Cm2 of the gap due to the roughness of the master in the display unit. Then, when the electrode surfaced is pressed against to a surface to be measured, a numeral which is nearly proportional to the electric capacity of the gap is displayed as the roughness value of a set parameter.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a capacitive roughness meter.

(Prior art) A capacitive roughness meter evaluates roughness by expressing the space volume of the gap caused by the roughness as an electric capacitance, but the display is not standardized by ISO, JIS, etc. There is no one that uses unique values other than the parameters mentioned above, and the idea is that the centerline average roughness 'F' in the stylus type
Since it is most similar to La, most meters or digital displays use Rα display.

(Problem to be Solved by the Invention) In addition to the above-mentioned center line average roughness Rα, standards such as ISO and JIS include a maximum height 1αX and a ten-point average roughness R2. Alternatively, in business establishments that have adopted the display of R2 as an in-house standard, it is not possible to directly convert Ra to ~U or R2, so a conventional capacitive roughness meter cannot be used unless the standard is changed. have.

(Means for Solving the Problems) The present invention solves the above problems and sets the maximum height -G or ten-point average roughness R2, which is a parameter other than the centerline average roughness Ra, by the stylus method. The purpose of this is to enable the use of capacitive roughness meters even in cases where a capacitive roughness meter is used.

In other words, in the present invention, the roughness values of two masters are measured as parameters using a stylus type roughness meter. Or calculate it as R2, input that value into the display unit, and set the roughness of the surface to be measured to be the same as the two masters above in proportion to the capacitance of the gap volume caused by the roughness of the two masters and the surface to be measured. It is configured so that it can be displayed using parameters.

(Function) When two masters with an appropriate gap in roughness values are set, and their roughness values are R4rL1 and FL1rL2, the capacitance due to the gap is C7FL1 and C7, respectively.
m2, the electric capacity due to the gap between the workpieces is Cw, and the roughness value is Rw, then Cwt: Crnt: Cw= 1×t: R7
7!2: The relationship R111 is approximately satisfied, and Rw can be displayed as a measured value.

(Example) Next, a capacitive roughness meter according to an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a front view of a display unit showing the configuration of a capacitive roughness meter according to an embodiment of the present invention, and FIG. 2 is a diagram showing the relationship between capacitance and roughness value.

A capacitive roughness meter according to an embodiment of the present invention includes a thumbwheel switch 1 for setting a roughness value, a switch 2 for outputting the set roughness value, and a digital display panel 3 for displaying and storing the roughness value. and a potentiometer 5 which is directly connected to the knob 4 and calibrates the displayed value to the master roughness value.

First, prepare two masters with an appropriate gap in roughness value, and measure the roughness value with a stylus type roughness meter.

How to increase the roughness 1. The rougher one is uta 2.

The roughness value parameter may be any of Ra, P-mar, and Rz.

Next, what is the finer roughness value R? Set FII on thumbwheel switch 1, press switch 2 with the electrode surface of the roughness detection probe (not shown in figure 2) pressed against the finely roughened master surface, and display the set value Rm on the digital display panel 3. and memorize it.

Next, the electrode surface is pressed against the rough master surface to display the roughness on the digital display spring N3.

Turn the knob 4 and use the directly connected potentiometer 5 to display R77!2 in accordance with the master roughness value.

With this operation, the publication value (~nx, R2, R (any one of 1) corresponding to the electric capacitances Cm1 and Cm2 of the gap due to the roughness of the master is stored in the display unit.

After the above operation, when the electrode surface is pressed against the surface to be measured of the workpiece, the displayed value will be the roughness Rm of the set parameter.
+ r Displayed as a value approximately proportional to the capacitance of the gap due to RnL2.

As has already been proven, this value is theoretically accurate for the roughness cross-sectional curve of a regular triangular waveform, but there is no practical problem in approximating the roughness cross-sectional curve for an irregular roughness waveform. It is possible to show correlated numerical values within a range.

The numerical input method is not necessarily limited to the digital thumbwheel switch shown in the above embodiment, but may also be an analog volume method. Also, the master to be set is a master with finer roughness, and a master with finer roughness is used as a mirror surface. The value may be auto-preset to 0, and the roughness parameter is Ra.

There is no problem in inputting arbitrary values such as not only R and R2 but also other parameters and class values.

(Effects of the Invention) As described above, according to the present invention, it is possible to display roughness parameters Rα, a, ..., 'f%Z using a capacitive roughness meter using a stylus type roughness meter. This capacitive roughness meter is convenient to carry, can measure even when the workpiece is attached to the machine, and has the advantages of not being affected by vibrations, making it highly practical for on-site use. There are excellent effects that can be achieved.

[Brief explanation of drawings]

FIG. 1 is a front view of a display unit showing the configuration of a capacitive roughness meter according to an embodiment of the present invention. FIG. 2 is a diagram showing the relationship between the capacitance and roughness value of the capacitive roughness meter according to the embodiment of the present invention. 1... Thumbwheel switch, 2... Switch. 3. Digital display panel, 4... Knob, 5...
potentiometer.

Claims (2)

[Claims] (1) A thumbwheel switch to set the roughness value, a switch to output the set roughness value, a digital display panel to display and store the roughness value, and a display value to the master roughness value. It is characterized by being equipped with a potentiometer to calibrate, inputting the roughness values of two masters according to arbitrary parameters, and displaying the roughness value with the same parameters as the master in proportion to the capacitance of the gap due to the surface roughness. Electric capacitive roughness meter. (2) The thumbwheel switch above is the volume,
The capacitive roughness meter according to claim (1), wherein the digital display panel is an analog display panel.