JPH01252363A - Rotor type shot peening device - Google Patents

Abstract

PURPOSE:To stabilize the peening effect and the quality of works by controlling the rotation frequencies of rotors responding to the globular diameter of the shot to make the kinetic energies almost even when the shot is injected. CONSTITUTION:Of shots 13 selected by a shot separating device 21, those with the diameter 0.5mm or more, for example, are fed to the first rotor 15, and those with the diameter less than 0.5mm, and 0.2mm or more are fed to the second rotor 17, and they are preaccelerated. In this case, the rotation frequencies of the first rotor 15 and the second rotor 17 are controlled by a control device to make the kinetic energies almost even when the shots 13 are injected by a feeding devices 33 and 35. As a result, a stable peening effect can be obtained, and the quality of works can be stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a rotor-type shot peening apparatus for performing surface treatment on, for example, metal materials.

(Conventional technology) Conventionally, for example, a shot, which is a small metal ball, is projected onto the surface of a part of a workpiece such as a spring used in a vehicle or a part where stress is concentrated, such as a workpiece, to increase compressive stress and improve fatigue strength. Shot peening devices are known. According to this device, a grain boundary oxidation layer is formed on the surface of a workpiece that has been carburized and quenched, which reduces fatigue strength, but this layer can be removed by the shot stage, making it possible to improve The effect is extremely large. (For example, JP-A-61-38
869) The most widely produced type of such shot peening apparatus, which is of the rotor type, is shown in FIGS. 5 and 6, for example.

In the figure, a shot peening apparatus 101 includes a large table 105 and a small table 107 on which a workpiece 103 is placed. The large table 105 is rotatable relative to the cabinet 109, and the small table 1
07 is rotatable relative to the large table 105.

The work 103 is placed on a small table 107, so that the work 103 can rotate around itself.

Shot peening R1101 uses shot 111 as ■
A tenth lens 113 and a twentieth lens 115 are provided for projecting onto the soak 103. Each rotor 113.115
are arranged so that shots 111 can be projected onto different workpieces 103 at the same time.

The shot 111 of the throw 111 is circulated to the upper shot reservoir 119 by the packet conveyor 117, and the shot 11 has a small ball diameter due to wear etc. and has a small peening effect.
1 is separated and discarded by a single shot dispensing device 121 provided at the bottom of the upper shot reservoir 119.

Such a shot separating device 121 and the tenth-taper 11
An enlarged perspective view of 3 is shown in FIG. 7, for example. In the same figure, the shot metering device 121 is equipped with a mesh 123, and for example, the shot 111 is separated into those whose spherical diameters do not pass through the mesh 123 (Q, 3 mm or more) and those whose spherical diameters pass through the mesh 123 (Q, smaller than 3 mm). .

Then, the shot 111 with a ball diameter of Q, 3mm+ or more is,
The shot is supplied to the drum 127 of the tenth tank 113 via the shot supply pipe 125. The tenth blade 113 includes a plurality of blades 129 extending in the radial direction. The shot 111 in the drum 127 is supplied to the base of the blade 129, pre-accelerated, centrifugally accelerated along the rotating blade 129 of the tenth rotor 113, and projected onto a workpiece (not shown) to obtain a peening effect. .

It should be noted that the 20th terminal 115 also has the same configuration as the 10th terminal 113, and operates in the same manner.

(Problem to be Solved by the Invention) By the way, the rotation speed of the 10th gear 113 and the 20th gear 1
The rotational speed of shots 115 is almost the same, whereas the diameter of the shot 111 separated by the shot separation device 121 and supplied to the 10th shot 113 or the 20th shot 115 varies due to wear and the like. ing. For this reason, the 10th-
The kinetic energy of each shot 111 that is centrifugally accelerated by the rotor 113 and the rotor 115 varies, resulting in non-uniform peening effects and potentially unstable workpiece quality.

The present invention has been made in view of the above-mentioned problems, and aims to provide a rotor-type shot peening device that can stabilize the quality of a workpiece by substantially uniformizing the kinetic energy of shots having different spherical diameters. .

[J? (Means for Solving the Problems) In order to achieve the above object, the present invention includes a plurality of rotatable rotors, each rotor having a plurality of blades extending in the radial direction. , a rotor-type shot peening device that supplies shot to the center side of the rotor of the blade and projects the centrifugally accelerated shot onto the workpiece from the outer periphery of the rotating rotor, a drive means that rotates each of the rotors separately; a sorting means for sorting the shots according to their spherical diameters; a supplying means for supplying the shots sorted by the sorting means to different rotors according to their spherical diameters; A control means is provided for driving the driving means in accordance with the sphere diameter so that each kinetic energy is approximately uniform, and controlling the number of rotations for each 〇-〇.

Further, the control means sets the spherical diameter of one shot to r, and sets the rotational speed of one rotor to which this shot is supplied to 01.
Then, if the spherical diameter of the other shot i is r2, and the rotational speed of the other rotor to which this shot is supplied is n2, the configuration is such that control is performed so as to satisfy the formula '+3n+=r23n2.

(Function) In the above configuration, after the sorting means sorts the shots according to the ball diameter, the supply means supplies the shots to different rotors according to the ball diameter, and the control means controls the drive of the drive means to project the shots. By changing the rotation speed of the rotor according to the ball diameter so that the kinetic energy of each ball is almost the same,
The kinetic energy of each shot is approximately the same.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIGS. 2 to 4 show a rotor type shot peening apparatus for zero production according to an embodiment of the present invention.

First, the configuration will be described. The shot peening apparatus 1 includes a large table 7 and a plurality of small tables 9 on which a plurality of workpieces 5 are placed in a cabinet 3. The large table 7 is rotatable relative to the cabinet 3, and the small table 9 is rotatable relative to the large table 7. The workpiece 5 is placed on a small table 9, so that the workpiece 5 can rotate around itself. In this embodiment, a plurality of gears, for example, are placed as the work 5.

Further, a partition plate 11 is provided between each small table 9.9 for peening each workpiece 5 independently.

The shot peening apparatus 1 is equipped with a rotatable tenth peening 15 and a twentieth peening 17 which are installed in a cabinet 3 and project shots 13 onto a workpiece 5. Each rotor 15, 17 is arranged so that it can simultaneously project shots 13 onto different workpieces 5. In this embodiment, for example, the 10th machine 15 projects the shot 13 onto the workpiece 5 from above, and the 20th machine 17 projects the shot 13 from below. Further, a working hole 19 for exchanging the workpiece 5 is formed on the opposite side of the cabinet 3 from the first and twentieth digits 15.17.

The tenth motor 15 and the twentieth motor 17 are connected to independent drive means such as DC motors, and the drive of each drive means is controlled by a control means (not shown). Further, the first and twentieth blades 15.17 are provided with a plurality of flat blades 20 extending in the radial direction with a predetermined length.

The shots 13 supplied to the 10th tank 15 and the 20th tank 17 are sorted according to their spherical diameters by a shot separating device 21 serving as a sorting means.

The shot separation device 21 has a first frame 23, a second frame 25, and a third frame 27 from above, as shown in FIG.

A first mesh 29 is attached to the first frame 23 to allow the shot 13 having a spherical diameter of less than 0.5 mm to pass therethrough. Also, in the second frame 25, Q, shot 13 of less than 2 mm is shown.
A second mesh 31 is pasted to allow the passage of the third frame 27.
No mesh is affixed to it.

One end of a first shot supply pipe 33 and a second shot supply pipe 35 are connected to the first frame 23 and the second frame 25 in order, respectively, as supply means.

The other end of each such shot supply tube 33,35 is connected to the first
10th via the tank 37 and the second tank 39, respectively.
-ta 15 and 20th tar 17. Also,
In the third frame 27, there is a discard @4 to discard shot 13.
1 are connected.

Therefore, the shot 13 of Q,5+un or more is supplied to the 10-th point 15, and the shot 13 of Q,5n+m or more is supplied to the 10th point 15,
The above shot 13 is supplied to the 20th shot 17 and pre-accelerated.

Next, the effect will be explained.

In the above configuration, the first and twentieth blades 15, 17 are rotated independently by the operation of a drive mechanism (not shown), and the shot 13 is attached to the rotating blades 20 of the first and twentieth blades 15, 17. It is centrifugally accelerated and projected onto the workpiece 5 from the outer periphery of the first and twentieth targets 15 and 17.

Here, the rotation speeds of the first and twentieth rotors 17 are set as follows. That is, the equation of motion of the shot 13 projected as described above is -a+ 1v 2
= −m 2 v 22・(1)λ
It is 2. However, l111 consumes one shot 13,
l112 is the mass of the other sheet I□ 13, vl and ■
2 is the initial velocity when each shot 13 is thrown from the blade 20.

At this time, the initial velocity V can be expressed as v = 2πn R/60. However, n is the rotation speed of the rotor 15.17,
R is the radial strength of the blade 20.

Moreover, the purchase m of shot 13 is l11=dπr3ρ. Here, r is the sphere diameter of shot 13, and ρ is the specific gravity of shot 9.

Therefore, the formula <1) becomes rl n1=r2 n2 ·t2>. Here, r is the sphere diameter of the first shot 13, rl
is the sphere diameter of the other shot 13. This sphere diameter rl and r
For example, the average value of the normal distribution of the shots 13 selected by the shot separation device 21 is taken as l.

Then, the control means sets the rotational speed of the 10th rotor 15 or the 20th rotor 17 so as to satisfy the above formula (2) with respect to the spherical diameter of the shot 13 supplied to the rotor. That is, in this embodiment, the rotational speed of the 20th rotor 17 is set higher than the rotational speed of the 10th rotor 15. The rotation speed of the rotor can be directly set, for example, using an operation section of a control panel.

Therefore, the kinetic energy of each shot 13 accelerated by the 10th shot 15 and the 20th shot 17 becomes almost uniform.

Therefore, according to this embodiment, the shot 13 whose kinetic energy is almost uniform is projected onto the workpiece 5 to obtain a stable peening effect, and the quality of the workpiece 5 can be stabilized. In addition, due to wear etc., the ball diameter may decrease by 0.2
Shots 13 whose peening effect is less than 101 are discarded, so shots 13 with a small peening effect are used as the first shot as before.
It is also possible to effectively prevent the liquid from being supplied to the second [1-ter 15, 17] side.

The shot 13 after being projected is focused into a lower shot reservoir 43 provided at the bottom of the cabinet 3.

One end of a shot recovery tube 45 is connected to the lower shot reservoir 43, and the other end of the shot recovery tube 45 is connected to the bottom of a packet conveyor 47. Packet conveyor 47
has a plurality of packets 49 connected to a belt 53 wound around an upper roller 51 and a lower roller (not shown). A driving device (not shown) is connected to either the upper roller 51 or the lower roller, and by driving the driving device, the belt 53 rotates counterclockwise in FIG. 3. At the top of the packet conveyor 47, a guide plate 55 is provided below the upper roller 51.
The tip of the guide plate 55 faces the upper scimitar reservoir 57.

Shots 13 after throwing rJJ collected in the lower shot reservoir 43 pass through the shot collection @ 45 and are collected at the bottom of the packet conveyor 47. By driving the drive device, the belt 53 is rotated and the shots 13 are collected by the packets 49. It is scraped and rises.

Thereafter, when the packet 49 is reversed over the upper roller 51, the shot 13 in the packet 49 is guided by the guide F;L5.
5 and is collected in the upper shot reservoir 57.

Thereafter, shot 13 is supplied to shot separation device 21 . The shots 1-13 worn out during this circulation process are discarded, but new shots are supplied from a shot supply device (not shown). Conventionally, for example, the ball diameter was 0.3 mm.
In this example, even if the ball diameter is less than 0.3IBff1, the shot 13 with a diameter of less than 0.2111
If it is 111 or more, it will be centrifugally accelerated by the 20th rotor 17 which has a high rotational speed, and almost the same kinetic energy as the shot 13 with a ball diameter of 0.3n+m or more will be obtained. For this reason, the scrap 11J
The number of shots 13 to be used can be reduced as a whole, making management easier and reducing costs.

Note that the present invention is not limited to the above-mentioned embodiments, and may be configured such that, for example, the rotor rotation speed is set by the control means by automatically calculating the rotor rotation speed.

[Effect of the Invention 1 As explained above, according to the present invention, shots are sorted according to the ball diameter, and the shots are classified into different D-types according to the ball diameter.
The rotational speed of the rotor can be changed so that the kinetic energy of the shots supplied at the same time and projected by the control means is almost the same, and the peening effect can be stabilized, thereby stabilizing the quality of the workpiece. can.

4. Drawing li! Ill Explanation Fig. 1 is a view corresponding to the claims of this invention, Fig. 2 is a cross-sectional view of a rotor type shot peening apparatus according to an embodiment of this invention, and Fig. 3 is a cross-sectional view taken along line m-■ in Fig. 2. , FIG. 4 is an enlarged perspective view of a shot separating device as a sorting means, FIG. 5 is a cross-sectional view corresponding to FIG. 2 of the conventional example, and FIG. 6 is a cross-sectional view of FIG. 7 is an enlarged perspective view of the main part of FIG. 5.

5...Work 13...Shot 15...
・10th tater 17...20th tater 20...Blade 21...Shot separation device (sorting means) Fig. 5 11Q Fig. 7

Claims (2)

[Claims] (1) Equipped with a plurality of rotatable rotors, each rotor has a plurality of blades extending in the radial direction, and centrifugal acceleration is achieved from the outer periphery of the rotating rotor by supplying shots to the center of the rotor of the blades. A rotor-type shot peening device that projects shots onto a workpiece, comprising a driving means for rotating each rotor separately, a sorting means for sorting the shots according to a spherical diameter, and shots sorted by the sorting means. A supply means for supplying the shot to different rotors according to the diameter of the sphere, and controlling the rotational speed of each rotor according to the diameter of the sphere so that the kinetic energy of each shot is approximately uniform when projecting the shots supplied by this supply means. A rotor-type shot peening device, characterized in that it is equipped with a control means for controlling. (2) The control means sets the spherical diameter of one shot to r_1, and sets the rotational speed of one rotor to which this shot is supplied to n.
_1, the spherical diameter of another shot is r_2, and the rotation speed of another rotor to which this shot is supplied is n_2, then control is performed to satisfy the formula r_1^3n_1=r_2^3n_2. The rotor type shot peening apparatus according to claim (1).