JP2000042926A - Highly strengthening device for gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To economically and efficiently treat a waste liquid containing powdery flowing chips by recovering the waste liquid containing the powdery flowing chips generated by pulverizing glass beads by a recovering mechanism, and separating this waste liquid into liquid and the powdery flowing chips through a separating mechanism. SOLUTION: A waste liquid containing powdery flowing chips generated at cleaning time is sent to a centrifugal separator 300 constituting a separating mechanism 28 by a liquid injection means constituting a recovering mechanism 26. The centrifugal separator 300 is provided with a sludge discharge port 302 for discharging the powdery flowing chips being the separated solid part and a liquid discharge port 304 for discharging water being a separated liquid, and a sludge recovering box 306 is arranged under the sludge discharge port 302 to thereby discharge the powdery flowing chips to the sludge recovering box 306 from the sludge discharge port 302. While, water containing the powdery flowing chips is discharged to a first waste pipe 326 from the liquid discharge port 304. Thus, the waste liquid is easily and reliably separated for reuse.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear strengthening device for increasing the strength of a gear surface.

[0002]

2. Description of the Related Art Normally, a gear is repeatedly subjected to a load when used, so that it is necessary to increase the fatigue strength of the gear surface. For this reason, conventionally, shot peening in which a steel ball or the like collides with a gear surface to impart a compressive residual stress has been widely performed.

However, in shot peening, since a steel ball is used as a shot material, the gear surface is roughened, and the surface roughness is reduced. Therefore, as disclosed in Japanese Patent Publication No. 5-21711, the surface of a metal molded product is quenched, and then, after grinding the metal surface, glass beads having a particle size of 0.2 mm to 0.6 mm are projected. A method for increasing the strength of a metal surface is known. In this way, the metal surface is prevented from being roughened to improve the fatigue strength.

[0004] However, in the above-mentioned prior art, the applied compressive residual stress is reduced and the fatigue strength cannot be improved to a desired value, and the directivity of the projected glass beads is poor. There is a problem that the beads are scattered in various directions and the efficiency is significantly reduced.

[0005] Further, since the glass beads collide with the gear surface, which is a metal surface, and are pulverized, micron-order glass bead dust (hereinafter, also referred to as powder dust) is floating in the processing chamber. However, the gear to be processed is mounted on the spindle and rotated at a high speed, and fine powder dust easily adheres to the high-speed rotating spindle, which may cause a problem such as poor rotation of the spindle. There was a problem.

Accordingly, the applicant of the present invention has developed a gear height which imparts a sufficient compressive residual stress, obtains a smooth surface from the tooth surface to the tooth root, and enables reliable removal of fine glass bead debris. A strengthening device has been proposed and a patent application has been filed (see Japanese Patent Application Laid-Open No. 9-248765).

In this prior art, a projection mechanism for projecting a jet of glass beads and liquid from a nozzle toward a gear surface after heat treatment in a chamber, and the glass beads are formed by being crushed on the gear surface. And a collecting mechanism for sucking and collecting the powder dust, and the collecting mechanism has a suction port facing the inside of the chamber and arranged near the gear. As a result, the glass beads have a directivity and accurately collide with the gear surface, imparting a desired compressive residual stress to the gear surface, and the fine powder dust generated by grinding the glass beads is reduced. Suction and collection will be ensured from the suction port.

[0008]

By the way, in the above-mentioned recovery mechanism, the mist containing the powder dust floating in the chamber is suctioned and discarded. If this occurs, the amount of waste liquid to be discarded reaches a considerable amount. However, while the powder dust contained in this drainage can be used for the production of glass beads, the liquid can be reused as washing water in the chamber.

The present invention has been made in order to effectively utilize such resources, and economically and efficiently treats a wastewater containing powder dust generated by crushing glass beads. It is an object of the present invention to provide a gear-strengthening device capable of performing the above-described steps.

[0010]

In the apparatus for enhancing the strength of a gear according to the present invention, a jet of glass beads and a liquid is projected toward the surface of the gear. It is reliably projected on the surface, and a desired compressive residual stress is applied to the gear surface. At that time, after the wastewater containing the powder dust generated by crushing the glass beads is collected by the collection mechanism, the wastewater is separated into the liquid and the powder dust via the separation mechanism.

Therefore, the separated powder dust is reused, for example, for the production of glass beads, while the liquid from which the powder dust has been removed is used as washing water in the chamber. This facilitates effective use of resources.

Further, there are provided first and second tanks for storing the separated liquid, and the separated liquid is selectively discharged to the first and second tanks via the switching discharge means.

Here, one of the first and second tanks is a liquid storage tank from which powder dust has been removed, and the other is an impure liquid storage tank in which the powder dust is mixed. That is, there is a period during which the liquid and the powder dust cannot be completely separated from the drainage, such as when the separation mechanism starts or stops, and the liquid discharged during this period is stored in the impure liquid storage tank. Discharge. Therefore, in the liquid storage tank,
Liquid in which powder dust is completely separated is stored, and the liquid in the liquid storage tank is supplied to a recovery mechanism via a supply mechanism, and is effectively used, for example, for a mist recovery shower or the like. .

[0014]

FIG. 1 is a schematic perspective view of a gear-strengthening apparatus 10 according to an embodiment of the present invention.
FIG. 3 is a front explanatory view of the high-strengthening device 10, and FIG.
FIG. 2 is an enlarged cross-sectional front view of the upper portion of the high-strength device 10.

The high-strength apparatus 10 holds a gear 12 as an object to be processed and holds a chamber (processing chamber) in a casing 14.
A gear holding mechanism 16 for positioning and holding the gear 12 within 14a; a projection mechanism 24 for projecting a jet 22 of a liquid, for example, water 18 and glass beads 20 toward the gear 12; A collection mechanism 26 that collects, together with the drainage, powder dust 20a generated by grinding on the surface of the gear 12, a separation mechanism 28 that separates the collected waste liquid into the water 18 and the powder dust 20a, Is provided.

The gear holding mechanism 16 includes a spindle unit 32 provided with a driving unit 30 which is in contact with one end of the gear 12.
And support means 36 provided with a rotating part 34 for supporting the other end of the gear 12. Spindle unit 3
2 is a servo motor for rotating and driving the drive unit 30
8, while the supporting means 36 includes a cylinder 40 for moving the rotating portion 34 forward and backward in the axial direction.
Is adjustable in the axial direction via the position adjusting means 42. As shown in FIG. 1, the position adjusting means 42 includes a manual handle 44, and the position of the support means 36 is changed by rotating the manual handle 44.

The projection mechanism 24 includes a robot 100 disposed outside the casing 14.
Of the casing 14 in the casing 14 in a state where the arm portion 102 is protected by the bellows member 103.
Placed in A nozzle 104 is attached to the tip of the arm portion 102, and an upper side of the nozzle 104 has
A mixing chamber 106 for mixing the water 18 and the glass beads 20 is connected. The water 18 and the glass beads 20 are connected to a water supply source and a hopper (not shown) via conduits 108 and 110, respectively (see FIG. 3).

The casing 14 is provided with an opening 14b for opening the chamber 14a to the outside, and this opening 14b is opened and closed via a double door 120 (see FIG. 1). In the chamber 14a, the fluid ejecting means 2 constituting the recovery mechanism 26 is provided.
00 is arranged. As shown in FIG.
00 is disposed on the ceiling 14c side of the casing 14,
The chamber 14a includes four water jet nozzles 202a to 202d for jetting a liquid, for example, water 18, at a wide angle. The spray angles and directions of the water spray nozzles 202a to 202d are set so that the water 18 can be sprayed into the entire chamber 14a.

The bottom 14d of the casing 14 is inclined toward one corner (see FIG. 3), and a water pipe 204 is arranged near the bottom 14d. As shown in FIG. 4, the water pipe 204 includes:
A water jet nozzle 206 for jetting water 18 for cleaning the lower surface side of the arm unit 102 of the robot 100 at a wide angle, and gear cleaning nozzles 208a to 208f are provided.

As shown in FIG. 3 and FIG.
6 has a suction port 210 provided at an upper portion of one side of the casing 14, and the negative pressure generating section 212 is connected to the suction port 210. The negative pressure generating section 212 is provided with a compressed air supply port 214 on the side thereof.
The negative pressure generator 212 functions to be in a negative pressure state under the action of blowing the compressed air introduced from 4. The casing 218 constituting the showering chamber 216 is connected to the negative pressure generating section 212. This casing 2
A spraying means 220 is mounted in the chamber 18, and the water 18 is sprayed from the spraying means 220 to perform showering in the chamber 216.

A pipe 222 is connected to the casing 218, and the pipe 222 is connected to a joint pipe 224 connected to the lowermost position of the bottom 14 d of the casing 14. The joint tube 224 includes a tube 226,
The centrifugal separator 30 constituting the sorting mechanism 28 via the 228
Connected to 0. An air tube 230 is connected between the tubes 226 and 228 in a vertically upward direction. An air introduction pipe 232 is connected to the casing 14 on the opposite side of the suction port 210 and on the lower side (see FIG. 3).

The separation mechanism 28 is disposed below the casing 14, and the centrifugal separator 300 constituting the separation mechanism 28 has the separated powder solids 20a as shown in FIG. Outlet 302 for discharging wastewater
And a liquid discharge port 304 for discharging the separated water 18. A sludge collection box 306 is arranged below the sludge discharge port 302, and a first tank 310 and a second tank 312 are selectively connected to the liquid discharge port 304 via a switching discharge means 308. .

As shown in FIGS. 6 and 7, the first tank 310 is set to have a relatively large capacity.
a is a tank for storing water 18 from which water has been completely removed.
The second tank 312 is a tank for storing the water 18 in which the powder dust 20a is mixed, and has a smaller capacity than the first tank 310.

The switching and discharging means 308 is shown in FIGS.
As shown in FIG.
A first receiving member 320 and a second receiving member 322 are connected to a rod 318 extending in a horizontal direction from the cylinder 316. The first and second receiving members 320 and 322 are supported via a pair of guides 324 provided on the mounting plate 314 so as to be able to advance and retreat.

One end of a first drain pipe 326 is connected to the first receiving member 320, and the other end of the first drain pipe 326 is disposed in the second tank 312. The second receiving member 322 has a second
One end of the drain pipe 328 is connected, and the second drain pipe 328 is connected.
Is disposed in a receiving tank 330 that extends vertically downward and is disposed in the first tank 310. The first and second receiving members 320 and 322 are selectively disposed at positions corresponding to the liquid discharge ports 304 under the action of the cylinder 316. A discharge pipe 332 connected to the upper end side of the sludge collection box 306 is arranged in the second tank 312.

As shown in FIG. 9, a level sensor 334 is provided in the first tank 310, and the first tank 3
The water level within 10 is detected at four positions: an upper limit position, a discharge start position, a discharge stop position, and a lower limit position. First tank 3
10, a first pump 336 and a second pump 338 are disposed, and the first pump 336 is connected to the first tank 31.
A supply mechanism 342 that supplies the water 18 in the casing 0 to the liquid ejecting unit 200 in the casing 14 via the water path 340 is configured. The second pump 338 has a function of discharging the water 18 in the first tank 310 to the outside.

The operation of the thus-configured high-strength apparatus 10 will be described below.

First, the gear 12 which has been subjected to gear cutting by cutting is subjected to carburizing and quenching. After the carburizing and quenching process, the rotating unit 34 of the support means 36 is operated under the action of the cylinder 40 while the drive unit 30 of the spindle unit 32 of the gear holding mechanism 16 holds one end of the gear 12. The other end of the gear 12 is supported by being displaced toward the gear 12. Then, with the double door 120 closed and the opening 14b of the casing 14 closed,
The servomotor 38 constituting the spindle unit 32 is driven to rotate the gear 12 (see FIG. 3).

At this time, the water 18 and the glass beads 20 are operated under the action of a high-pressure pump (not shown) constituting the projection mechanism 24.
Is pumped to the mixing chamber 106 via lines 108 and 110, respectively. Therefore, a jet 22 of water 18 and glass beads 20 is projected from the nozzle 104 toward the gear 12 with directivity.

Further, the nozzle 104 is
The gear 12 moves in a predetermined direction, that is, in the axial direction of the gear 12, and compressive residual stress is applied to the entire tooth surface of the gear 12 via the glass bead 20. Is crushed. Powder dust 2 generated by grinding the glass beads 20
0a is floating in the casing 14, and the collection mechanism 26
Ejecting means 200 and negative pressure generator 212 constituting
Is driven.

In the liquid ejecting means 200, as shown in FIG. 4, water 18 is ejected into the chamber 14a in the casing 14 via each of the water ejecting nozzles 202a to 202d.
The powder dust 20a floating in the chamber 14a and the powder dust 20a adhering to the arm 102 of the robot 100 are forcibly discharged to the bottom 14d side of the casing 14. Water 18 is jetted from a water jet nozzle 206 attached to the water pipe 204, and
The lower side of the arm 102 is cleaned by the water, and the water 1 jetted from each of the nozzles 208a to 208f.
The cleaning operation of the gear 12 is performed via 8.

The drainage including the powder dust 20a generated at the time of cleaning by the liquid ejecting means 200 flows along the inclination of the bottom 14d, and as shown in FIGS.
From the pipes 226 and 228 via the joint pipe 224 connected to 4, it is sent to the centrifugal separator 300 constituting the separation mechanism 28.

On the other hand, when the negative pressure generating section 212 is driven and compressed air is introduced from the compressed air supply port 214, a negative pressure is generated at the suction port 210 and the chamber 14 of the casing 14 is formed.
The powder dust 20a floating in the suction port 210a
Is sucked into the chamber 216 and decelerated. In the chamber 216, the showering is performed via the injection means 220 arranged in the casing 218, and the powder dust 20 a
Is introduced into the centrifugal separator 300 from the pipe 222 through the joint pipes 224, 226 and 228, and the compressed air is discharged from the air pipe 230 to the outside. In addition, outside air is introduced into the chamber 14a from the air introduction pipe 232.

In the centrifuge 300, the switching and discharging means 308 is driven according to the time chart shown in FIG. That is, in the centrifugal separator 300, the predetermined number of rotations is not reached immediately after the start of operation, so that the
There is a period during which water and water 18 cannot be completely separated.
Therefore, the first receiving member 320 constituting the switching discharge means 308 is provided in advance with the liquid discharge port 30 of the centrifuge 300.
4 (see the solid line in FIG. 8).

For this reason, the sludge dust 20 a which is a solid portion is discharged from the sludge discharge port 302 of the centrifugal separator 300 to the sludge collection box 306. On the other hand, powder dust 20a
Is discharged from the liquid discharge port 304 to the first receiving member 3.
The water is discharged to a first drain pipe 326 connected to the first drain pipe 20, and is introduced into the second tank 312 from the first drain pipe 326.

Next, the centrifugal separator supply pump (not shown) is driven, and after a lapse of a predetermined time from the start of the operation of the centrifugal separator 300, the cylinder 316 constituting the switching / discharging means 308 is driven. 7 and 8
As shown in, the first and second receiving members 320 and 322 move integrally in the direction of arrow A via the rod 318,
The second receiving member 322 is arranged corresponding to the liquid outlet 304 of the centrifugal separator 300 (see a two-dot chain line in FIG. 8). Therefore, the water 18 discharged from the centrifuge 300
Is a second drain pipe 328 connected to the second receiving member 322.
After being discharged to the receiving tank 330 via the first tank 310, it is stored in the first tank 310 containing the receiving tank 330.

In the first tank 310, the level sensor 33
4 stored in the first tank 310
8 is detected, and the first pump 336 and the second pump 338 are selectively driven as necessary. As shown in FIG. 9, when the first pump 336 forming the supply mechanism 342 is driven, the water 18 in the first tank 310 is discharged via the water path 340 to the liquid ejecting unit 2 forming the recovery mechanism 26.
Sent to 00. Thereby, the water 18 is supplied to the chamber 14.
a used for cleaning the gear 12 and the arm portion 102 and for collecting the powder dust 20a floating in the chamber 14a. When the second pump 338 is driven, the water 18 in the first tank 310 is drained to the outside.

Next, when the driving of the centrifugal separator 300 is stopped, the switching discharge means 308 is driven based on a stop signal of a centrifugal separator supply pump (not shown). After the one receiving member 320 is arranged, the stopping operation of the centrifuge 300 is performed. During the stop operation of the centrifuge 300, the powder dust 20a cannot be reliably removed from the drainage due to the decrease in the rotation speed, and the water 18 containing the powder dust 20a is discharged to the second tank 312 side. are doing. As a result, in the first tank 310, only the water 18 from which the powder dust 20a has been completely removed is always stored.

In this case, in this embodiment, the chamber 14
When the high strength treatment is performed on the gear 12 through the projection mechanism 24 in the a, the powder dust 20a generated by the pulverization of the glass beads 20 is collected together with the drainage through the collection mechanism 26, and then the separation mechanism 28 The waste water is separated into water 18 and powder
0a.

Therefore, if the separated powder dust 20a is introduced into the sludge collection box 306, the powder dust 20a
a can be easily used for the manufacturing operation of the glass beads 20, for example. On the other hand, water 18 separated from wastewater
Is stored in the first tank 310 and then the first pump 33
6 is supplied to the collection mechanism 26 under the action of the supply mechanism 342 provided with the cleaning water 6, and is reused as washing water or the like. As a result, there is an effect that the resources can be effectively used with a simple configuration.

In this embodiment, the sorting mechanism 28
First tank 3 for storing water 18 from which powder dust 20a has been removed
10 and a second tank 312 for storing water 18 mixed with the powder dust 20a, and an impure liquid (water 18 mixed with the powder dust 20a) that is likely to be generated when the centrifuge 300 starts or stops. And a switching discharge unit 308 for discharging the wastewater to the second tank 312.

Therefore, in the first tank 310,
Only the water 18 from which the powder dust 20a is completely removed is stored, and the water 18 in the first tank 310 can be kept clean. Accordingly, if the water 18 in the first tank 310 is supplied to the recovery mechanism 26 or the like, there is an advantage that various operations using the water 18 having no impurities, for example, a mist recovery operation are effectively performed.

[0043]

According to the gear-strengthening apparatus of the present invention, after collecting wastewater containing powder dust generated by crushing glass beads, the wastewater is separated into liquid and powder dust. Is provided with a sorting mechanism. Therefore, the waste liquid can be easily and reliably separated into the liquid and the powder dust and reused, and the effective use of resources can be easily achieved.

[Brief description of the drawings]

FIG. 1 is a schematic perspective explanatory view of a gear strengthening device according to an embodiment of the present invention.

FIG. 2 is an explanatory front view of the high-strength device.

FIG. 3 is an enlarged sectional front view of the upper part of the high-strength device.

FIG. 4 is another partial perspective explanatory view of a recovery mechanism constituting the high-strength device.

FIG. 5 is an explanatory partial front view of the collecting mechanism.

FIG. 6 is a partially exploded schematic perspective view of a separation mechanism constituting the high-strength device.

FIG. 7 is an explanatory plan view of the sorting mechanism.

FIG. 8 is an explanatory view of the operation of a switching and discharging means constituting the sorting mechanism.

FIG. 9 is an explanatory diagram of a fluid circuit of the high-strength device.

FIG. 10 is a time chart for explaining the operation of the sorting mechanism.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... High strength apparatus 12 ... Gear 14, 218 ... Casing 14a ... Chamber 16 ... Gear holding mechanism 18 ... Water 20 ... Glass beads 20a ... Powder dust 22 ... Jet 26 ... Recovery mechanism 28 ... Sorting mechanism 32 ... Spindle unit 36 ... Supporting means 40, 316 ... Cylinder 100 ... Robot 102 ... Arm part 104, 208a-208f ... Nozzle 200 ... Liquid ejecting means 202a-202d, 206 ... Water ejecting nozzle 204 ... Water pipe 210 ... Suction port 216 ... Chamber 220 ... Injection Means 300 Centrifuge 302 Sludge discharge port 304 Liquid discharge port 306 Sludge collection box 308 Switching discharge means 310, 312 Tank 320, 322 Receiving members 326, 328 Drain pipe 330 Receiving tank 332 Discharge Tube 334 ... Level sensor 3 36, 338: Pump 342: Supply mechanism

Claims (4)

[Claims] 1. A gear strengthening device for enhancing the strength of a gear surface, comprising: a gear holding mechanism for positioning and holding the gear in a processing chamber; and a glass bead and a liquid from a nozzle toward the gear surface. A projection mechanism for projecting a jet of the liquid, a collection mechanism for collecting powder dust generated by the glass beads being crushed on the gear surface together with a drain, and a collection mechanism for collecting the collected drain with the liquid and the powder dust. And a separation mechanism that separates the gears into: and a gear. 2. The high-strength apparatus according to claim 1, wherein the separation mechanism includes first and second tanks for storing the separated liquid, and the first tank and the first tank for storing the separated liquid. And a switching discharging means for selectively discharging the two tanks and the two tanks. 3. The high-strength apparatus according to claim 2, wherein one of the first and second tanks is a liquid storage tank from which the powder dust is removed, and the other contains the powder dust. A gear-strengthening device characterized by being an impure liquid storage tank. 4. The gear-strengthening apparatus according to claim 3, further comprising a supply mechanism for supplying the liquid in the liquid storage tank to the recovery mechanism.