JP2002239910A - Liquid honing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems in honing work wherein liquid honing work using ice slurry as projection material is enlarging its application range in which damage is not given to a surface of a workpiece, and projection material is not left on the surface of the workpiece after work, but ice choking phenomenon in a spray gun is caused by ice grains of a large grain size mixed in ice slurry resulting in hindrance to stable honing. SOLUTION: This liquid honing device comprises an ice grain mixing tank 1 in which ice grains and water are supplied from an upper part, and in which these are mixed by an agitation propeller 15 installed downward in the tank to be taken out as ice slurry at a lower part, and a spray gun 8 to spray ice slurry supplied from the ice grain mixing tank 1 toward the surface of the workpiece. Above the agitation propeller 15 in the ice grain mixing tank 1, a mesh parting wall 18 to part the inside of the tank to an upper part and a lower part for prohibiting pass of the ice grains of a preliminarily set grain size or more downward is provided. An agitating rod 20 is provided above and under the mesh parting wall 18 to compose the liquid honing device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid honing apparatus,
More specifically, the present invention relates to a liquid honing apparatus using an ice slurry as a projectile.

[0002]

2. Description of the Related Art Among liquid honing processes, a type using an ice slurry, which is a mixture of ice particles and water, as a blasting material does not damage a workpiece, and
Since no projectile remains after processing, its use range is steadily expanding.

[0003] The applicant of the present invention disclosed in Japanese Patent Application Laid-Open No. Hei 8-309660, after storing block-shaped cubic ice produced in an ice machine in an ice storage tank, slicing it in an ice-breaking machine, and mixing it with water in an ice particle mixing tank. A liquid honing apparatus has been proposed in which an ice slurry is formed, and the slurry is pumped to an injection gun by a slurry pump, and then accelerated by a compressed gas to collide with a surface of a workpiece.

[0004]

In the liquid honing process, an injection gun 8 as shown in FIG. 1 is used. In this kind of gun, the inner diameter A of the nozzle 24 at the tip of the gun and the jet located in the injection gun main body 27 are used. 25 internal diameter B, nozzle 24
It is conventionally known that the size of the gap G between the jet and the jet 25 greatly affects the processing capacity. In general, the gap G between the nozzle 24 and the jet 25 is usually smaller than the inner diameter A of the nozzle 24, and all the ice particles constituting the ice slurry are formed between the nozzle 24 and the jet 25. Although it is necessary to have a size that can pass through the gap G between them, in the conventional device, due to the performance of the
It is unavoidable that large ice is mixed in the ice-mixing tank, and the large ice is caught in the gap G between the nozzle 24 and the jet 25, and ice clogging occurs inside the spray gun 8. However, there has been a case where a trouble that the injection of the ice slurry from the nozzle 24 becomes impossible occurs.

An object of the present invention is to solve the above-mentioned problems in the liquid honing apparatus using the ice slurry, and even if large ice is mixed in the ice particle mixing tank, An object of the present invention is to provide a liquid honing apparatus capable of performing stable injection of ice slurry without being transferred to the injection gun as it is and without causing ice clogging inside the injection gun.

[0006]

Ice particles and water are supplied from the upper part, mixed with a stirring propeller 15 installed downward in the tank, and taken out as an ice slurry from the lower part. In a liquid honing apparatus comprising a tank 1 and an injection gun 8 for spraying the ice slurry sent from the ice particle mixing tank 1 toward the surface of the workpiece, the liquid honing apparatus includes: A mesh-shaped partition wall 18 that blocks ice particles having a particle size equal to or larger than a predetermined particle size from passing below the tank so as to prevent the ice particles from passing downward is provided.
By arranging the rotary stirring rods 20 above and below the mesh-like partition 18, the above-mentioned problem is solved.

[0007]

FIG. 2 is a longitudinal sectional view schematically showing one embodiment of a liquid honing apparatus according to the present invention, and FIG.
FIG. 4 is a plan view of a mesh-like partition 18 which is a main component thereof.

In FIG. 1, reference numeral 1 denotes an ice particle mixing tank having a bottomed cylindrical shape whose upper surface is closed by an upper lid 2, and an ice particle supply pipe 3 and a water supply pipe 4 are attached to the upper lid 2. An electromagnetic valve 5 for opening and closing the pipe is provided in the middle of the water supply pipe 4. On the other hand, a pair of ice slurry outlets 6 and 7 are opened on the bottom surface of the ice particle mixing tank 1, and one ice slurry outlet 6 is connected to an ice slurry conduit 9. The other end of the conduit 9 is the ice slurry pump 1
0 is connected to the injection gun 8.

An ice slurry circulation pipe 11 is connected to the other ice slurry outlet 7. The ice slurry circulation pipe 11 is connected to an ice slurry circulation pump 12 and an ice slurry concentration monitor 13 to mix ice particles. It is connected to an ice slurry reflux port 14 provided at the lower part of the peripheral wall of the tank 1.

The injection gun 8 has a structure as shown in FIG. That is, the nozzle 2 is provided at the tip of the hollow injection gun main body 27.
4 has a jet 25 in its internal space,
The nozzle 25 is mounted so as to face the nozzle 24 with a gap G therebetween.
Is connected. The end of the ice slurry conduit 9 opens obliquely on the side wall of the injection gun main body 27 toward the nozzle 24 side.

In this embodiment, the inner diameter A of the nozzle 24 is 6.4 mm, and the inner diameter B of the jet 25 is 3.2 m.
m, the gap G between the nozzle 24 and the jet 25 is 5.4
mm, but is not limited to this dimension.

Further, in the figure, reference numeral 15 denotes a stirring propeller positioned downward in the ice particle mixing tank 1 and connected to a rotating shaft of a driving motor 17 installed on the lid 2 via a rotating shaft 16. Have been. Further, a mesh partition 18 as shown in FIG. 3 is attached slightly above the stirring propeller 15 to vertically separate the inside of the tank, and the rotating shaft 16 passes through a central through-hole 19 and moves downward. The agitating propeller 15 is attached to the tip.

The size of the opening 26 of the mesh-like partition 18 is limited to the size of the ice particle 2 having a particle size larger than a predetermined particle size.
2, and the opening 26 has a size of 2.5 mm in this embodiment. Furthermore, the mesh-like partition 1 of the rotating shaft 16
A rotary stirring rod 20 for stirring the inside of the tank in close proximity to the mesh-like partition 18 is attached to the front and back sides of 8, so that the inside of the tank rotates following the rotation of the rotating shaft 16.

In this embodiment, the electromagnetic valve 5 is opened to supply water 21 from the water supply pipe 3 to the inside of the ice particle mixing tank 1 while opening the solenoid valve 5 and to connect the ice particle supply pipe 3 to the water supply pipe 3. Ice particles 22 are supplied into the ice particle mixing tank 1. Naturally, the water 21 is preferably cold water. The ice particles 22 are produced by, for example, shaving a block-shaped cubic ice produced by an ice machine (not shown) with an ice machine.

In the ice particle mixing tank 1, water 21 and ice particles 2
The ice slurry 23 is stirred by the rotation of the stirring propeller 15 to become an ice slurry 23, moves downward in the ice particle mixing tank 1 by a downward water flow formed by the rotation of the stirring propeller 15, It flows into the conduit 9, is sent to the injection gun 8 by the action of the ice slurry pump 10, is accelerated by the compressed gas injected from the jet 25, is injected at high speed from the nozzle 24 of the injection gun 8 toward the surface of the workpiece, It is used for processes such as undercoating, cleaning, deburring, descaling, and peening.

At this time, a mesh-shaped partition 18 is provided in the ice-particle mixing tank 1, and only ice particles 22 having a particle size equal to or less than the particle size that can pass through the mesh-shaped partition 8 are taken out of the ice slurry outlet 6.
And the larger ice particles 22 are prevented from passing through the mesh-shaped partition walls 8. Therefore, the size of the opening 26 of the mesh-like partition 8 is set to the size of the nozzle 24
If it is smaller than the gap G between the jet and the jet 25,
The occurrence of the phenomenon of ice clogging due to large ice particles 22 in the spray gun 8 is prevented beforehand.

In this embodiment, the injection gun 8
The gap between the nozzle 24 and the jet 25 is 5.4 mm
Accordingly, the opening 2 of the mesh partition 8 is accordingly
The size of 6 is 2.5 mm, but is not limited to this, and the size of the opening 26 of the mesh partition 18 is determined according to the size of the gap G between the nozzle 24 and the jet 25. Of course.

On the upper and lower sides of the mesh partition 18,
The rotating stirring rods 20, 20 are constantly rotating, and the rotation of the stirring rods 20, 20 vigorously agitates the ice slurry 23, preventing the accumulation of the ice particles 22 in the vicinity of the mesh-shaped partition walls 18. The passage of the mesh-like partition wall 18 is promoted, and the concentration of the ice slurry 23 in the entire area of the ice particle mixing tank 1 is made uniform.

A part of the ice slurry 23 flows into the ice slurry circulation pipe 11 from the ice slurry outlet 7 and is sent to the ice slurry concentration monitor 13 where the concentration is measured. To ice particle mixing tank 1
Refluxed inside. When the ice slurry concentration monitor 13 detects that the concentration of the ice particles 22 is lower than the set value, the supply amount of the ice particles 22 from the ice particle supply pipe 3 is increased, and conversely, the concentration of the ice particles 22 is reduced. If it is higher than the set value, the electromagnetic valve 5 is opened and the supply amount of the water 21 from the water supply pipe 4 is increased, so that the concentration of the ice slurry 23 is always kept constant.

[0020]

The liquid honing apparatus according to the present invention has the above-described configuration, and there is no possibility that large ice particles 22 are mixed in the ice slurry 23 sent to the injection gun 8. The particle size of the ice particles 22 in the inside can always be kept at a certain value or less, the clogging of the inside of the spray gun 8 by large ice particles is prevented, and the stable
3 is very practical.

[Brief description of the drawings]

FIG. 1 is a sectional view of an example of an injection gun in a liquid honing apparatus.

FIG. 2 is a longitudinal sectional view schematically illustrating one embodiment of the liquid honing apparatus according to the present invention.

FIG. 3 is a plan view of a mesh partition, which is a constituent part of the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ice particle mixing tank 2 Top lid 3 Ice particle supply pipe 4 Water supply pipe 5 Solenoid valve 6 Ice slurry discharge port 7 Ice slurry discharge port 8 Injection gun 9 Ice slurry conduit 10 Ice slurry pump 11 Ice slurry circulation pipe 12 Ice slurry circulation pump 13 Ice Slurry Concentration Monitor 14 Ice Slurry Reflux Port 15 Stirring Propeller 16 Rotating Shaft 17 Drive Motor 18 Mesh Partition Wall 19 Through Hole 20 Rotary Stir Rod 21 Water 22 Ice Particles 23 Ice Slurry 24 Nozzle 25 Jet 26 Opening 27 Injection Gun Body 28 Compressed gas conduit

Claims (1)

[Claims] 1. An ice particle mixing tank 1 that supplies ice particles and water from the upper part, mixes them with a stirring propeller 15 installed downward in the tank, and takes out as an ice slurry from the lower part. In a liquid honing apparatus including an injection gun 8 for injecting the ice slurry sent from the ice particle mixing tank 1 toward the surface of the workpiece, the liquid honing apparatus is vertically moved above the stirring propeller 15 in the ice particle mixing tank 1. And a mesh partition 18 for preventing ice particles having a particle size equal to or larger than a predetermined particle size from passing below, and a rotary stirring bar 20 disposed above and below the mesh partition 18. Liquid honing device.