JPS5819982B2 - Hardness measurement method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hardness measurement method, and in particular to a method that can stably and quickly measure the hardness of a measured object, thereby improving measurement accuracy and measurement efficiency at work sites. The goal is to achieve the following.

The hardness measurement method conventionally carried out in measurement rooms and work sites involves simply placing and fixing the object to be measured on the base of a hardness tester, such as a Tanckwell hardness tester, Vickers hardness tester, or Shore hardness tester, and then measuring the hardness using a specified method. The hardness was measured by operating a measuring needle.

Therefore, when the object to be measured has an unstable surface such as a spherical or cylindrical surface, the measurement becomes unstable and the speed of the measurement work is also impaired.

Therefore, an object of the present invention is to provide a hardness measuring method that can eliminate the above-mentioned disadvantages, and to enable stable and quick hardness measurement by integrally combining an indicator with a hardness meter. It is something.

Hereinafter, the present invention will be explained in more detail based on embodiments shown in the accompanying drawings.

FIG. 1 is a front view showing an embodiment of a hardness measuring device used in implementing the hardness measuring method according to the present invention, FIG. 2 is a side view of the same embodiment, and FIG. FIG. 3 is a front view illustrating the hardness meter used in the device shown in FIG. 2;

Now, in FIGS. 1 and 2, the hardness measuring device 10 has a device frame 12 and a base 26 on which the object W to be measured is placed and set, and the device frame 12 has a sliding bearing 14a inside. A fixed bearing portion 14 is provided.

A main shaft 16 is attached to the sliding bearing 14a of the fixed bearing portion 14 so as to be able to slide upward and downward, and a hardness meter 18 is fixed to the lower end of the main shaft 16 by an appropriate fixing means, for example, a fixing screw. .

Further, an indicator 20 is fixed to the hardness meter 18 by a fixing screw 21, so when the above-mentioned main shaft 16 slides up or down, the hardness meter 18 and the indicator 20 move up or down together. It is.

Now, the upper and lower sliding of the main shaft 16 is performed by rotating the handle 22 and moving the main shaft 16 through the reduction gear mechanism 24.
This is achieved by applying upward and downward linear motion to the rack 25 fixed to the rack 25.

As clearly shown in FIG. 3, the hardness meter 18 has a reference surface 18a and a measuring needle 18b at its lower end, and a scale window 18c with a built-in hardness scale plate and a pointer 18d in its body. has been done.

When measuring the hardness of an object to be measured, this hardness meter 18 makes pressure contact between the reference surface 18a and the measuring needle 18b, and when the reference surface 18a contacts the hardness measurement surface of the object, the hardness of the object is measured. The measuring needle 18b is correspondingly displaced with respect to the reference surface 18a, and the hardness is determined by the magnitude of this displacement, and the measured hardness value is displayed by the pointer 18d in the scale window 18c. It will be done.

On the other hand, the indicator 20 has a well-known structure including a stylus 20a and a scale section 20b that displays the displacement position of the stylus 20a, and an electric section 20c that generates an electrical signal according to the amount of displacement of the stylus 20a. Those further equipped with the following are commonly used.

The structure of the electric section 20c includes, for example, a built-in microcontact and is formed to generate electrical signals of various signal levels depending on the range of displacement of the stylus 20a. The hardness measuring method of the present invention carried out by the apparatus will be explained below.

For example, when measuring the hardness of a measuring object W having a cylindrical shape as shown in FIG. W is not constant between each other, and therefore stable hardness measurement results cannot be obtained.

According to the method of the present invention, first, a hardness reference object (as shown in the figure) which has a hardness sufficiently greater than that of the object W to be measured and has a surface shape and surface dimensions that match the shape of the measurement surface of the object W to be measured. (without reference material) is prepared in advance, and this reference object is placed and fixed on the base 26 of the hardness measuring device 10.

Next, by rotating the bundle 22, the reference surface 18a of the hardness meter 18 and the I'll constant needle 18b are brought into pressure contact with the hardness reference object, and at the same time, the stylus 20a of the indicator 20 is also brought into contact.

In this way, the measuring needle 18b of the hardness meter 18 naturally undergoes a greater displacement than when measuring the hardness of the object W.
Indicator 20 in this displacement state of measuring needle 18b
The displacement of the stylus 20a is set to an appropriate scale value, and this set scale is determined as a reference value for integral movement of the hardness meter 18 and indicator 20.

For example, the value of the indicator 20 is set at a position where the pointer 18a of the hardness meter 18 indicates the maximum hardness (that is, when the measuring pointer 18b does not protrude beyond the reference surface 18a).

With this setting, the reference plane 18a by the indicator 20
This means that the indicated value for the position has been determined.

When the above operations are completed, the preparation process for the hardness measurement method according to the present invention is completed.

Next, the bundle 22 is rotated to pull up the hardness meter 18 and indicator 20, and the hardness reference object is removed from the base 26.

Next, the object W whose hardness is to be measured is placed and fixed on the base 26 of the hardness measuring device 10.

Then, by rotating the bundle 22 again, the hardness meter 18 and the indicator 20 are simultaneously lowered toward the object W to be measured. The measurement object W is pressed into contact with the object W until the movement reference value determined by the object is displayed.

In this manner, when the moving reference value is displayed on the indicator 20, the measured hardness value of the workpiece W is obtained by reading the indicated value of the pointer '18d in the scale window 18c of the hardness meter 18.

Next, the bundle 22 is rotated again to once again pull the hardness meter 18 and the indicator 20 upward, the object W to be measured is replaced with another similar object W, and the hardness is again measured by the same operation as described above.

In addition, in the indicator 20, an electric signal is transmitted from the electric part 20C when the above-mentioned movement reference value is reached, and the electric signal lights up an external lamp or activates a buzzer. A total of 18 reading points can be notified to the operator more clearly.

In this way, in this example, the reference movement value is determined in advance by the indicator using a reference object that has a hardness exceeding that of the object to be measured and has a surface shape and dimensions that match the shape of the measurement surface of the object to be measured. I'll keep it.

Therefore, even if the object to be measured has a shape that has a step between the contact surface position of the reference surface of the hardness tester and the contact surface position of the indicator stylus, it is possible to If the reference movement amount is determined using the measurement surface of the dimensions, no inconvenience will occur when carrying out the hardness measurement according to the present invention.

In these cases, even if there is a large difference in hardness between the objects to be measured, if the reference movement of the indicator is determined using a reference object whose hardness exceeds the hardness of the objects to be measured, then the There is no problem in hardness measurement.

As can be understood from the above explanation, according to the hardness measuring method according to the present invention, by using a hardness meter and an indicator together, stable and constant measurement conditions can be maintained for a large number of measured objects when measuring the hardness of the measured objects. Since the hardness can be measured at the bottom of the machine, the reliability and accuracy of the measurement are improved1.Moreover, since the measurement operation can be carried out quickly, it is possible to significantly improve the work efficiency of hardness measurement in the measurement room or at the work site. .

[Brief explanation of the drawing]

Fig. 1 is a front view showing one embodiment of a hardness measuring device used in carrying out the hardness measuring method according to the present invention, Fig. 2 is a side view of the same device, and Fig. 3 is a diagram showing a hardness meter used in the device. It is a front view. In addition, in the figure, 10... Hardness measuring device, 12...
...Machine frame, 16...Main shaft, 18...
Hardness meter, 18a...Curved reference surface, 18b...Measuring needle, 20...Indicator, 20a...
・Stylus, 20c...Electric part, 26...
Base.

Claims (1)

[Claims] 1. A reference surface that is brought into pressure contact with the hardness measurement surface of the object to be measured set on a base, and a reference surface that is brought into pressure contact with the hardness measurement surface of the object to be measured; A hardness measuring method for measuring the hardness of a workpiece using a hardness meter having a correspondingly displaced measuring needle and an indicator having a stylus contacting the hardness measurement surface of the workpiece, the hardness meter and A standard that can be integrated with the indicator and moved toward the object to be measured, has a hardness exceeding the hardness of the object to be measured, and has a surface shape and surface dimensions that match the shape of the measurement surface of the object to be measured. An object is set on the base in advance, and the reference surface of the hardness meter and the stylus of the indicator are brought into contact with the reference object to predetermine the indicated value of the indicator as a reference movement value, and then the base is placed on the base. Bringing the hardness meter and indicator into pressure contact with the hardness measurement surface of the object to be measured set above, and when the indicator indicates the reference movement value, the value indicated by the hardness meter is taken as the hardness value of the object to be measured. A hardness measurement method featuring: 2. The hardness measuring method according to claim 1, wherein the indicator is capable of notifying the reference movement value by an electric signal.