JP2001038627A - Shot peening strength measuring unit, and strength measuring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid the disposal in place of the plastic deformation. SOLUTION: This measuring unit continuously and temporally records the displacement AH of an elastic plate 1 with both end parts 7, 8 supported by a body 2. The elastic plate 1 is formed of a substance having the physical property that the elastic plate is substantially free from plastic deformation, the elastic plate 1 is provided with a working part, and the working part has a working surface 11 subjected to the collision energy of a shot. A flat part which is the working part is not plastically deformed but elastically deformed, and the energy received by the flat part and the collision energy of the shot can also be measured similar to a conventional practice, and the disposal can be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shot peening strength measuring instrument and a strength measuring method, and more particularly to a shot peening strength measuring instrument and a strength measuring method which are effective in managing a shot peening process.

[0002]

2. Description of the Related Art Metal materials are inspected for fatigue strength. As shown in FIG. 4, the measurement of the shot peening strength performed for the inspection is performed by attaching a standardized Almen test piece 10 to an Almen test piece holder 11 and attaching the Almen test piece holder 11 to a workpiece shot. The peening portion is placed at an assumed position, and shot peening is performed on the Almen test piece 10 under preset conditions. Thereafter, when the Almen test piece 10 is removed from the Almen test piece holder 11, the shot-peened surface 12 receives plastic deformation and compressive stress, and is deformed into an arc shape so that the surface becomes convex. The height displacement ΔH shown in FIG. 5 is measured by the almen gauge 12 shown in FIG. 6, and it is periodically confirmed that the shot peening intensity is obtained according to the set conditions, and the process management is performed. Is going.

[0003] According to such a known method, the periodic check with the Almen test piece is frequently performed (at the beginning and end of the work and every 4 hours for aircraft products), but the Almen test piece is disposable. In addition, this confirmation work took time, and the production efficiency was poor.

[0004] It is desired to provide a shot peening strength measuring instrument which can guarantee that the conditions of shot peening are within the specified range without disposable test pieces.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a shot peening strength measuring instrument and a strength measuring method which can ensure that the conditions of shot peening are within specified ranges without disposable use of test pieces. It is in.

[0006]

Means for solving the problem are described as follows. The technical items appearing in the expression are appended with numbers, symbols, and the like in parentheses (). The numbers, symbols, and the like are technical items that constitute at least one embodiment or a plurality of the embodiments of the present invention, in particular, the embodiments or the examples. Corresponds to the reference numerals, reference symbols, and the like assigned to the technical matters expressed in the drawings corresponding to the above. Such reference numbers and reference symbols clarify the correspondence and bridging between the technical matters described in the claims and the technical matters of the embodiments or examples. Such correspondence / bridge does not mean that the technical matters described in the claims are interpreted as being limited to the technical matters of the embodiments or the examples.

A shot peening strength measuring apparatus according to the present invention comprises a main body (2), an elastic plate (1) having both ends (7, 8) supported by the main body (2), and a displacement of the elastic plate (1). A recorder (15) for continuously recording the quantity (H),
The elastic plate (1) is formed of a material having physical properties that does not substantially deform plastically. The elastic plate (1) has an action portion (3), and the action portion (3) receives collision energy of a shot flow (ball). It has a working surface (11).

[0008] Although the flat portion serving as the action portion (3) is elastically deformed and does not deform plastically, the energy received by the flat portion and the collision energy of the shot ball can be measured as in the related art, so that disposable is avoided. be able to.

The elastic plate (1) has an operating portion (3) via both ends (7, 8), an operating portion (3), and both ends (7, 8).
Attachment parts (4, 5) which are integrally connected to each other, and both end parts (7, 8), working part (3) and attachment parts (4, 5) are integrally molded from the same material and manufactured. It is preferable in terms of manufacturing and stability of measurement accuracy. Both ends are semi-cylindrical, which is excellent in that measurement instrument performance can be easily unified. The material is SUS631, and its hardness is HR
C55 or more. The working part (3) has a width of 19 m.
m, its length is 76 mm, its thickness is 1.3 mm, and it is easy to replace the conventional device.

The method for measuring the shot peening strength according to the present invention is to record the amount of displacement of an elastic plate elastically displaced by the impact energy of a shot ball continuously and temporally as a value of a time function. The calculation of the collision energy and the energy received by the elastic plate from the maximum value of and the integrated value of the displacement amount. Since the amount of elastic deformation and the amount of plastic convex deformation are both determined by the magnitude of the collision energy of the shot ball and the amount of energy given, the elastic deformation measurement that replaces the conventional plastic deformation measurement is the same process as the conventional one. Management can be performed and can be replaced with conventional methods.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Corresponding to the drawings, in the embodiment of the shot peening strength measuring device according to the present invention, a measuring plate is attached to a measuring device main body. The measuring plate 1 is
As shown in FIG. 1, it is attached to the measuring instrument main body 2. The measuring device main body 2 is made of a material that is rigid and hardly generates distortion, and is formed thick. The measuring plate 1 is strongly connected to the measuring device main body 2 by bolts or other joining means.

The measuring plate 1 is formed by a flat part 3, a left end part 4, and a right end part 5. Left end 4 and right end 5
Are bent at an angle of 180 degrees with respect to the plane portion 3 and face each other. The measuring plate 1 can be formed as a flat tube whose cylinder is deformed flat. Left end 4
And the right end 5 face each other with a certain width. A cylindrical sensor hole 6 is formed in the measuring device main body 2 in an area having the width. The sensor hole 6 penetrates the measuring device main body 2 in a direction perpendicular to the plane of the plane portion.

The plane portion 3 and the left end portion 4 are integrally connected by a left semi-cylindrical portion 7. The flat part 3 and the right end part 5 are integrally connected by a right semi-cylindrical part 8. The area of the flat portion 3 toward which the sensor hole 6 extends is the flat portion 3
Is the central area.

As shown in FIG. 2, the displacement sensor 9
Is inserted into the sensor hole 6. As displacement amount sensor 9, displacement bar type, laser distance measurement type (relative length measurement)
Various measuring instruments are known. The open surface of the measuring plate 1, that is, the open surface or working surface 1 which is the upper surface side of the flat portion 3
1 is irradiated with a shot ball 12 from a nozzle 13.

The measuring instrument main body 2 is fixed to a predetermined position of a test piece mounting fixture (not shown) set on a table of a shot peening machine. Shot peening is performed under the same conditions as the work. The conditions include a shot ball material, a shot size, an air force for ejecting a shot ball, a nozzle angle, a nozzle distance, a table (not shown) rotation speed, and a peening time. These conditions determine the magnitude of energy, which is a physical quantity for the amount of displacement of elastic deformation described later.

A shot ball 12 irradiated from a nozzle 13
As shown in FIG. 2, the flat portion 3 of the measuring plate 1 receiving the momentum of FIG. The measuring plate 1, particularly the flat portion 3 of the measuring plate 1, is a flat plate having both ends substantially fixed. This flat plate is an elastic body and not a plastic body.
The flat portion 3 which is continuously irradiated with the shot ball 12 is elastically deformed continuously and temporally.

The amount of deformation ΔH is expressed by the following equation. ΔH = ΔH (t). This ΔH is read by the displacement sensor 9, and the electric signal output from the displacement sensor 9 is converted into the displacement ΔH by the converter 14, and is shown in FIG. Is recorded as

The displacement amount ΔH is correlated with the collision energy amount, particularly the momentum amount of the shot ball 12, and the maximum value Hmax of the displacement amount ΔH and the integrated value (integral value) S of the displacement amount indicate that the magnitude of the collision energy is large. , And the energy amount given to the plane portion 3 can be calculated back. Conventional shot peening process control has been controlled by the amount of convex plastic deformation of the Almen test piece. Such a convex deformation amount is a value determined by the magnitude of the collision energy of the shot ball and the given energy amount.

The amount of elastic deformation and the amount of plastic convex deformation are both
Since it is determined by the magnitude of the collision energy of the shot ball and the given amount of energy, the elastic deformation measurement that replaces the conventional plastic deformation measurement can perform the same process management as the conventional one. In that case, the elastically deformed test piece is
There is no need to disposable.

The measuring plate 1 has the following specifications so that plastic deformation does not occur during shot peening, an appropriate displacement is obtained, and the area of the shot ball contact surface is the same as that of the conventional Almen test piece. It is manufactured in. 1. Material: SUS631 2. Hardness: HRC 55 or more Dimensions: width 19 x length 76 x thickness 1.3 (unit is m
m) Here, the length is the length of the shot ball contact surface and the length of the flat portion 3 excluding the R portions 7 and 8.

[0021]

The shot peening strength measuring instrument and the strength measuring method according to the present invention can manage the process of shot peening without disposable.

[Brief description of the drawings]

FIG. 1 is an axial projection view showing an embodiment of a shot peening intensity measuring device according to the present invention.

FIG. 2 is a cross-sectional view showing the measuring method.

FIG. 3 is a graph showing data.

FIG. 4 is an axial projection view showing a known measuring instrument.

FIG. 5 is a front view showing a known measuring method.

FIG. 6 is a front view showing a known measuring instrument.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Elastic plate 2 ... Main body 3 ... Working part (flat part) 4, 5 ... Mounting capital 7, 8 ... Both ends 11 ... Working surface H ... Displacement

Claims (6)

[Claims] An elastic plate having both ends supported by the main body; and a recorder for continuously recording a displacement of the elastic plate, wherein the elastic plate is not substantially plastically deformed. A shot peening intensity measuring device, which is formed of a substance having physical properties, wherein the elastic plate includes an action portion, and the action portion has an action surface that receives collision energy of a shot flow. 2. The elastic plate according to claim 1, wherein the elastic plate includes the both ends, the operating portion, and a mounting portion integrally connected to the operating portion via the both ends. A working part and the working part are shot peening strength measuring devices that are manufactured by being integrally molded with the substance. 3. The shot peening strength measuring device according to claim 2, wherein each of the both ends is a semi-cylinder. 4. The material according to claim 3, wherein the substance is SUS631, and the hardness is HRC5.
A shot peening strength measuring device that is 5 or more. 5. The shot peening strength measuring device according to claim 4, wherein the working portion has a width of 19 mm, a length of 76 mm, and a thickness of 1.3 mm. 6. A time-continuous recording of a displacement amount at which an elastic plate receiving a collision energy of a shot flow elastically displaces as a function of time, and a maximum value of the displacement amount and a value of the displacement amount. A shot peening strength measuring method comprising calculating the collision energy and the energy received by the elastic plate from an integrated value.