JP2006062041A - Solid particle jetting device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique for preventing intrusion of solid particles into a hollow part of a hollow member from a gap generated between a closing member abutted on an opening peripheral edge of the hollow member to close the opening and the opening peripheral edge. <P>SOLUTION: This solid particle jetting device 10 is provided with the closing member 15 abutted on the peripheral edge of the opening of the hollow member 44 to close the opening, a communicating passage passing through the closing member 15 to communicate the hollow part of the hollow member 44 with the outside, a pressing member 14 for pressing the closing member 15 at the peripheral edge, an injection means 16 for injecting fluid pressurized from the communicating passage toward the hollow part, and a jetting means 18 for jetting solid particles to an external surface of the hollow member 44. Since the fluid flows to the outside when the gap is generated between the opening peripheral edge of the hollow member 44 and the closing member 15, solid particles are prevented from intruding into the hollow part of the hollow member 44 from the gap. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an apparatus and a method for spraying solid particles on a hollow member. Specifically, the present invention relates to a technique for preventing sprayed solid particles from entering a hollow portion of a hollow member.

An apparatus for spraying solid particles on the outer surface of a hollow member (for example, a hollow beam or a hollow shaft) is known. The solid particle spraying device is, for example, a shot peening device, a shot blasting device, or a sand blasting device. When spraying solid particles on the outer surface of the hollow member, it is necessary to prevent the solid particles from entering the hollow portion of the hollow member. This is because if the solid particles are not prevented from entering the hollow portion, the hollow member is commercialized with the solid particles remaining in the hollow portion. When a closing member that closes the opening of the hollow member is used, solid particles can be prevented from entering the hollow portion.
Patent Document 1 describes a method for curing a camshaft journal. In this technique, air is supplied into the camshaft body in a state where the end opening of the camshaft body is closed by a closing member. The air supplied to the shaft body flows out from an oil filler opening formed in the journal portion of the shaft body. When air flows out from the oil filler port, when shot peening is performed by spraying hard balls on the journal portion of the shaft body, it is possible to prevent the hard balls from entering the shaft body from the oil filler port.

JP 2002-166365 A

The technology of Patent Document 1 prevents the hard ball from entering the shaft main body from the oil supply port by physically closing the oil supply port of the shaft main body and using an air flow instead. If the opening of the hollow member is physically blocked, no air flow should be used. It is normal to physically and reliably occlude.
The present invention is an improved technique for preventing solid particles from entering the hollow portion by physically closing the opening of the hollow member. If the opening can be reliably closed, solid particles can be prevented from entering the hollow portion. However, if the shape accuracy of the opening periphery of the hollow member is not high, the periphery shape may vary from one hollow member to another. In order to close the openings of these hollow members, it is necessary that the closing member in contact with the periphery of the opening has elasticity and can absorb the variation in the peripheral shape. In this case, if the closing member is used repeatedly, the closing member may be worn or deformed, and the opening of the hollow member may not be completely closed. That is, a gap may be generated between the opening periphery of the hollow member and the closing member. When solid particles are sprayed on the outer surface of the hollow member in a state where the gap is generated, the solid particles enter from the gap.
The present invention has been made to solve such a problem. When a gap is formed between a member that abuts the opening periphery of the hollow member and closes the opening, and the opening periphery, the clearance is generated. It is an object of the present invention to provide a technique capable of preventing solid particles from entering the hollow portion of the hollow member.

The solid particle spraying device according to the present invention includes a closing member that abuts the periphery of the opening of the hollow member to close the opening, a communication passage that passes through the closing member and communicates the hollow portion of the hollow member with the outside, and the closing member. A pressing unit that presses against the peripheral edge; an injection unit that injects a pressurized fluid from the communication path toward the hollow portion; and a spraying unit that sprays solid particles onto the outer surface of the hollow member. And when the clearance gap between the opening periphery of a hollow member and a closure member arises, a fluid flows out outside, and it prevents that a solid particle penetrate | invades into the hollow part of a hollow member from the said clearance gap.
This solid particle spraying device closes the opening of the hollow member with a closing member. When the opening of the hollow member cannot be completely closed by the closing member, the solid particles enter the hollow portion of the hollow member by allowing the fluid to flow outside through the gap between the opening peripheral edge of the hollow member and the closing member. To prevent.

Said solid particle spraying apparatus WHEREIN: It is preferable to provide the means to measure the fluid quantity which flows out out of the said clearance gap.
As described above, when a means for measuring the amount of fluid flowing out from the gap between the opening periphery of the hollow member and the closing member is provided, the size of the gap can be estimated using the measured fluid amount.

  In the solid particle spraying method of the present invention, when the solid particles are sprayed on the outer surface of the hollow member with the closing member pressed against the periphery of the opening of the hollow member pressed against the periphery of the hollow member, The fluid pressurized from the outside is injected into the communication passage that communicates the hollow portion of the hollow member with the outside through the fluid, and the fluid flows out to the outside when a gap between the opening periphery of the hollow member and the closing member is generated. Thus, solid particles are prevented from entering the hollow portion of the hollow member from the gap.

The main features of the embodiments described later will be described.
(1) The embodiment relates to a shot peening apparatus which is a kind of solid particle spraying apparatus.
(2) The workpiece is formed in a cylindrical shape, and is set in the shot peening apparatus with the seal of the pressing jig pressed against the periphery of the upper opening and the seal of the receiving jig pressed against the periphery of the lower opening.
(3) Air is supplied into the work through an air flow path provided in the pressing jig from the air supply unit. Shot peening is performed by spraying hard balls from the spray nozzle onto the outer surface of the work while air is supplied into the work. If there is a gap (seal gap) between the pressing jig and the upper opening edge of the workpiece, or the receiving jig and the lower opening edge of the workpiece, air is ejected from the gap. When air is ejected from the seal gap, it is possible to prevent hard balls from entering the work through the seal gap.
(4) The pressure in the air flow path of the pressing jig is measured by the pressure measuring unit. A threshold is set in advance for the pressure (measurement pressure) measured by the pressure measurement unit. When the measured pressure falls below the threshold value, the seal gap is large, so it is determined that a hard ball has entered the work, and shot peening is stopped.

A shot peening apparatus which is a kind of solid particle spraying apparatus according to the present invention will be described with reference to the drawings. The present invention can also be suitably employed in solid particle spraying devices (for example, shot blasting devices and sand blasting devices) other than shot peening devices.
As shown in FIG. 1, the shot peening apparatus 10 includes a base part 12, an elevating drive part 14, a pressing jig 15, an air supply part 16, a pressure measuring part 17, and a spray nozzle 18. The base unit 12 includes a base 21, support pillars 22, and a receiving jig 23. The support column 22 is attached on the base 21. The receiving jig 23 is fixed to the upper end portion of the support column 22. A recess is formed in the upper end surface 23 a of the receiving jig 23, and a urethane seal 24 is attached to the recess.
The raising / lowering drive part 14 raises / lowers the pressing jig 15. For the elevating drive unit 14, for example, a drive mechanism using hydraulic pressure or air pressure, an electric motor drive mechanism, or the like can be used.

As shown in FIG. 2, a recess 32 is formed in the lower end surface 15 a of the pressing jig 15. A urethane seal 26 is attached to the recess 32. An air flow path 25 is formed in the pressing jig 15. One end 25a of the air flow path 25 is open to the side surface of the pressing jig 15, and a union 31 is attached to the opening. The other end 25 b of the air channel 25 is open to the bottom 32 a of the recess 32. A through hole 26 a is formed in the seal 26. The other end 25 b of the air flow path 25 communicates with the through hole 26 a of the seal 26. In the middle of the air flow path 25, one end 27a of the measurement flow path 27 is connected. The other end 27b of the measurement flow path 27 is open on the side surface of the pressing jig 15, and a union 33 is attached to the opening.
Support rods 34, 34 protruding downward are fixed to the pressing jig 15. A dish-like member 35 is horizontally fixed to the lower ends of the support bars 34, 34.
The air supply unit 16 includes a compressor 36 and a hose 37. The compressor 36 produces high pressure air. The hose 37 connects the compressor 36 and the union 31 mounted on the side surface of the pressing jig 15.
The pressure measurement unit 17 includes a pressure gauge 41 and a hose 42. The hose 42 connects the pressure gauge 41 and the union 33 attached to the side surface of the pressing jig 15. Since it is configured in this way, the pressure gauge 41 measures the pressure of the air flow path 25 of the pressing jig 15.
As shown in FIG. 1, the spray nozzle 18 sprays shot peening hard balls 43 on the outer surface of a work 44 (described later).
The shot peening apparatus 10 is installed on a turntable (not shown).

The shot peening apparatus 10 performs shot peening on a cylindrical workpiece 44. When the workpiece 44 is shot peened, the workpiece 44 is disposed between the pressing jig 15 and the receiving jig 23 in a state where the lifting drive unit 14 raises the pressing jig 15. Then, the pressing jig 15 is lowered, and the work 44 is sandwiched and set between the pressing jig 15 and the receiving jig 23. In this state, the seal 26 of the pressing jig 15 and the seal 24 of the receiving jig 23 are pressed against the peripheral edges of the upper opening and the lower opening of the work 44, respectively. As already described, the pressing jig 15 and the compressor 36 are connected by the hose 37, and the pressing jig 15 and the pressure gauge 41 are connected by the hose 42. For this reason, even if the pressing jig 15 moves up and down, the relative displacement between the pressing jig 15, the compressor 36 and the pressure gauge 41 is absorbed by the bending of the hoses 37 and 42.
When the compressor 36 is operated, pressurized air is supplied into the work 44 through the hose 37, the air flow path 25 of the pressing jig 15, and the through hole 26 a of the seal 26. If there is a gap (hereinafter referred to as “seal gap”) between the upper opening periphery of the work 44 and the seal 26 or between the lower opening periphery of the work 44 and the seal 24, air is released from the gap. It spouts vigorously.
Shot peening is performed by spraying hard balls 43 from the spray nozzle 18 onto the outer surface of the work 44 in a state where pressurized air is supplied to the work 44. Even if there is a seal gap, the air is vigorously ejected therefrom, so that the hard ball 43 is prevented from entering the work 44.
Air supplied to the work 44 flows into the work 44 from the through hole 26 a of the seal 26. The air flowing into the workpiece 44 is deflected by the dish-shaped member 35 toward the portion where the upper opening periphery of the workpiece 44 and the seal 26 are in contact. For this reason, the momentum of the air ejected from the periphery of the upper opening of the work 44 and the seal gap of the seal 26 becomes stronger, and the hard ball 44 is further prevented from entering the work 44.

The pressure gauge 41 communicates with the air flow path 25 via the measurement flow path 27 of the pressing jig 15 and the hose 42. For this reason, the air pressure supplied to the workpiece 44 by the pressure gauge 41 is measured. FIG. 3 is a graph showing the air pressure (hereinafter referred to as “measured pressure”) measured by the pressure gauge 41 when pressurized air is supplied to the workpiece 44. The vertical axis in FIG. 3 indicates the measured pressure, and the horizontal axis indicates the passage of time. When the supply of pressurized air is started, the measured pressure rises and stabilizes.
Since the capacity of the compressor 36 is constant, the measured pressure corresponds to the size of the seal gap. If the seal gap is small, the measured pressure increases. If the seal gap is large, the measured pressure is low. For this reason, by providing a threshold value for the measured pressure, it is possible to determine whether the seal gap is of a level that does not cause a problem when shot peening is performed or whether the seal gap is a level that should not be shot peened. Specifically, as shown in FIG. 3, shot peening is started when the measured pressure exceeds a threshold, as shown by line A or line B. Line A corresponds to the case where there is almost no seal gap. Line B corresponds to a case where a seal gap exists but the gap is not so large. In this case, since the pressure in the work 44 is sufficiently high, air is ejected vigorously from the seal gap, and the hard ball 43 is prevented from entering the work 44 from the seal gap. When the measured pressure is below the threshold as shown by line C, it can be determined that the seal gap is too large. Accordingly, in this case, shot peening is not started. When the measured pressure once exceeds the threshold and falls below the threshold again as indicated by the line D, it is considered that the seal gap has expanded during the supply of air to the workpiece 44. At this time, shot peening is stopped when the value falls below the threshold.

What is supplied to the work 44 is not limited to air. What is necessary is just to supply the workpiece | work 44 with the fluid which can flow out from a seal | sticker clearance gap and can prevent solid particles, such as a hard ball, invading inside.
What the pressure measuring unit 17 measures is not limited to the pressure in the air flow path 25 of the pressing jig 15. For example, even if the internal pressure of the workpiece 44 or the outlet pressure of the compressor 36 is measured, the size of the seal gap can be estimated from the measured values.
It is also possible to determine whether or not to spray solid particles by measuring values other than pressure. For example, the flow rate of the fluid flowing into the workpiece 44 is measured, and it is determined whether or not to spray solid particles using the measurement result.
The present invention can also be applied to hollow members having shapes other than the workpiece 44 of the present embodiment. For example, the present invention is also effective for a bottle-shaped hollow member having a bottom portion or a hollow member having a shape in which an opening is further provided on the side portion of the work 44.
The pressure measuring unit 17 and the spray nozzle 18 are connected to the controller, and when the pressure measured by the pressure measuring unit 17 falls below the threshold value, the controller stops the spraying of the hard ball 43 from the spray nozzle 18. Good.

Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.
In addition, the technical elements described in the present specification or drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology illustrated in the present specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

The perspective view of a shot peening apparatus. The fragmentary sectional view of a shot peening apparatus. The graph which shows the relationship between measurement pressure and time passage.

Explanation of symbols

10: Shot peening device 12: Base part 14: Elevating drive part 15: Pressing jig 15a: Lower end surface 16: Air supply part 17: Pressure measuring part 18: Spray nozzle 21: Base 22: Support column 23: Receiving Holding device, 23a: upper end surface 24: seal 25: air flow path, 25a: one end, 25b: other end 26: seal, 26a: through hole 27: measurement flow path, 27a: one end, 27b: other end 31: union 32 : Recess, 32a: bottom surface 33: union 34: support bar 35: dish-like member 36: compressor 37: hose 41: pressure gauge 42: hose 43: hard ball 44: workpiece

Claims (3)

A closing member that contacts the periphery of the opening of the hollow member and closes the opening;
A communication path that penetrates the blocking member and communicates the hollow portion of the hollow member with the outside;
Pressing means for pressing the closing member against the peripheral edge;
Injection means for injecting a pressurized fluid from the communication path toward the hollow portion;
A spraying means for spraying solid particles on the outer surface of the hollow member;
A solid particle spraying device that prevents a solid particle from entering the hollow portion of the hollow member through the gap when a gap between the opening periphery of the hollow member and the closing member is generated.   The solid particle spraying device according to claim 1, further comprising means for measuring an amount of fluid flowing out of the gap. When spraying solid particles on the outer surface of the hollow member with the closing member pressed against the periphery of the opening of the hollow member pressed against the periphery,
A fluid pressurized from the outside is injected into the communication path that penetrates the blocking member and communicates the hollow part of the hollow member with the outside, and when the gap between the opening edge of the hollow member and the blocking member is generated, the fluid flows out to the outside. A solid particle spraying method for preventing solid particles from entering the hollow portion of the hollow member through the gap.

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