CN201974978U - Rockwell hardness measurement demonstrator - Google Patents

Abstract

The utility model discloses a rockwell hardness measurement demonstrator which comprises a base, a support, a light-weight lever, a pressure head, a hook and weights. The support is fixed on the base; the light-weight lever is rotationally arranged on the light-weight lever; and the pressure head and the hook are arranged on the light-weight lever; the weights are hung on the hook; and the top end of the pressure head is in a cone shape. Therefore, the sample to be measured can be arranged on the base and below the pressure head, and pressure can be applied to the sample by increasing the number of the weights on the hook so that the plastic deformation depth generated by the weight to the sample can be accurately calculated, the whole calculation process of the rockwell hardness can be seen intuitively by the students, the teacher can explain conveniently and the students can understand intuitively.

Description

The rockwell hardness measurement demonstrator

Technical field

The utility model relates to a kind of rockwell hardness measurement instrument.

Background technology

Hardness measurement instrument in the market has a lot, be intelligent mostly, measuring process is more succinct, can directly read the hardness of object by the display screen of surveying instrument, but can not allow the student get information about the process and the principle of hardness measurement in the teaching process of these instruments, be unfavorable for teacher's explanation and student's study.

Summary of the invention

Technical problem to be solved in the utility model is: a kind of rockwell hardness measurement instrument is provided, can demonstrates the process of rockwell hardness testing, make things convenient for teacher to impart knowledge to students and student's study.

For solving the problems of the technologies described above, the technical solution of the utility model is: the rockwell hardness measurement demonstrator, comprise base, be fixed in the support on the described base, rotation is installed on the lightweight lever on the described support, be installed on pressure head and hook on the described lightweight lever, be suspended on the counterweight on the hook, described pressure head top is coniform.

As a kind of preferred version.The equidistant arrangement on the lightweight lever of tie point between described support, pressure head and hook and the lightweight lever.

Owing to adopted technique scheme, the sample of needs being measured hardness places base, be positioned under the pressure head, come to exert pressure by being increased in the last varying number counterweight that increases of hook to sample, and accurately calculate the plastic yield degree of depth that counterweight produces sample with this, the student can see the whole operation of calculating Rockwell's hardness intuitively, makes things convenient for teacher's explanation and student's intuitivism apprehension.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Accompanying drawing is the structure cut-open view of the utility model embodiment;

Among the figure: 1, base; 2, support; 3, the lightweight lever; 4, pressure head; 5, hook; 6, counterweight.

Embodiment

As shown in the figure, the rockwell hardness measurement demonstrator, comprise base 1, be fixed in the support 2 on the described base 1, rotate the lightweight lever 3 that is installed on the described support 2, be installed on pressure head 4 and hook 5 on the described lightweight lever 3, be suspended on the counterweight 6 of hook on 5, described pressure head 4 tops are coniform, support 2, pressure head 4 and link up with 5 and lightweight lever 3 between tie point equidistant arrangement on lightweight lever 3, during the convenient increase of equidistant arrangement counterweight 6, calculate applied pressure.

During use, the sample of needs being measured hardness places base 1, is positioned under the pressure head 4, increases counterweight 6, makes the P that preloads of pressure head 4 ₀, P ₀Be certain value, at this moment, the degree of depth by the survey record pressing in sample is h ₀, h ₀For preloading P ₀Elastic deformation that is produced and plastic yield.

Continue to increase counterweight 6, increase be main load p ₁, P ₁Be certain value, the gross load that is applied on the pressure head 4 is P=P ₀+ P ₁

Remove then and produce main load p ₁ Counterweight 6, the pressure of this moment becomes again and preloads P ₀, this moment, the degree of depth by survey record pressure head 4 pressing in sample was h ₁, P ₁After removing, by P ₁The elastic deformation change that is produced has disappeared, and P ₁The plastic yield that is produced also exists, and pressure head 4 is subjected to main load p ₁The plastic yield degree of depth that is produced is h=h ₀-h ₁

The h value is big more, illustrates that sample is soft more, and the h value is more little, illustrates that sample is hard more.In order to adapt to people's high more notion of the big more hardness of numerical value traditionally, artificial regulation deducts depth of cup h with a constant K, represent the height of hardness, and regulation 0.002mm is a Rockwell's hardness unit, HR represents with symbol, and then the computing formula of Rockwell hardness number is:

$\mathrm{HR}=\frac{K-h}{0.002}.$

Claims (1)

1. the rockwell hardness measurement demonstrator is characterized in that: comprise base, be fixed in the support on the described base, rotation is installed on the lightweight lever on the described support, be installed on pressure head and hook on the described lightweight lever, be suspended on the counterweight on the hook, described pressure head top is coniform.

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