JP2000308969A - Strengthening device for metal part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To recover powdery chips floating within processing chambers reliably and efficiently. SOLUTION: The strengthening device for metal parts comprises a metal parts holding mechanism 16 for retaining a metal part 12 in a processing chamber 14a, a projecting mechanism 24 for projecting a jet 22 of water 18 and glass beads 20 at the metal part 12, a recovering mechanism 26 for drawing in powdery chips 20a, or the glass beads 20 crashing against the surface of the metal part 12, to recover them as they are in the drainage, and a sorting mechanism 28 for sorting the recovered drainage again into the water 18 and the powdery chips 20a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for increasing the strength of a metal part for increasing the strength of the surface of the metal part.

[0002]

2. Description of the Related Art Generally, metal parts such as gears, connecting rods, crankshafts, etc. are subjected to repeated loads during use. Therefore, it is necessary to increase the surface fatigue strength. For this reason, hitherto, shot peening in which a steel ball or the like collides with the surface of a metal component to impart a compressive residual stress has been widely performed.

[0003] However, in shot peening, a steel ball is used as a shot material, so that the surface of a metal component is roughened, and the surface roughness is reduced. Then, as disclosed in Japanese Patent Publication No. 5-21711, the surface of the metal molded product is hardened,
Particle size after grinding metal surface is 0.2mm ~ 0.6mm
There is known a method of increasing the strength of a metal surface by projecting glass beads. This aims to improve the fatigue strength without roughening the metal surface.

[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 was a problem that beads scattered in various directions and the working efficiency was significantly reduced.

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

Accordingly, the present applicant has developed a metal component which can impart a sufficient compressive residual stress, obtain a smooth surface from the tooth surface to the root, and can reliably remove fine glass bead debris. A high strength apparatus 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 a liquid from a nozzle toward a surface of a metal part after heat treatment in a chamber, and the glass beads are crushed on the surface of the metal part. And a collecting mechanism for sucking and collecting the generated powder dust, and the collecting mechanism has a suction port facing the inside of the chamber and arranged near the metal component. As a result, the glass beads accurately collide with the surface of the metal component with directivity, imparting a desired compressive residual stress to the surface of the metal component, and a fine powder flow generated by grinding the glass beads. Debris is surely collected by suction from the suction port.

[0008]

By the way, in the above-mentioned recovery mechanism, mist (drainage) containing powder dust floating in the chamber is sucked and discarded. If the processing is continued, the amount of the powder dust floating in the chamber becomes considerably large. Therefore, when disposing of the mist from inside the chamber,
It is difficult to reliably remove the powder dust from the chamber.

The present invention solves this kind of problem and provides a metal component capable of efficiently and reliably treating a wastewater containing powder dust generated by crushing glass beads. It is an object to provide a strengthening device.

[0010]

In the apparatus for increasing the strength of a metal part according to the present invention, since a jet of glass beads and a liquid is projected toward the surface of the metal part, the glass beads have directivity. Thus, the projection is reliably applied to the surface of the metal component, and a desired compressive residual stress is applied to the surface of the metal component. At that time, the wastewater containing the powder dust generated by crushing the glass beads is collected by the collection mechanism.

Here, the recovery mechanism has a chamber communicating with the lower side of the processing chamber, and mist containing powder dust floating on the lower side of the processing chamber via its own weight or showering is provided in this chamber. Is smoothly sucked into the chamber under the action of suction means communicating with the chamber. Then, the liquid is injected into the chamber, so that the powder dust can be reliably collected. At that time, outside air can be introduced into the processing chamber through an outside air inlet, and when the processing chamber is sucked from the suction port, the processing chamber is prevented from becoming negative pressure.

Further, the chamber has a first chamber in which the liquid ejecting means is accommodated, and a second chamber communicating with the downstream side of the first chamber and communicating with the suction means. Therefore, the flow rate of the mist containing the powder dust absorbed from the processing chamber can be effectively reduced through the first and second chambers, and the powder dust contained in the mist can be reduced via the liquid ejecting means. It is possible to collect the glass bead waste smoothly and reliably.

[0013] Further, a separation mechanism for separating the collected waste liquid into liquid and powder dust is disposed downstream of the collection mechanism. Thereby, the separated powder dust is reused, for example, for manufacturing glass beads, and the liquid from which the powder dust has been removed is reused as cleaning water in the chamber. That is, effective use of resources can be easily achieved.

[0014]

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

The high-strength apparatus 10 holds a metal part 12 (shown in the form of a gear in the figure) such as a gear, a connecting rod or a crankshaft, which is an object to be processed, and places the metal part in a processing chamber 14 a of a casing 14. A metal component holding mechanism 16 for positioning and holding the component 12;
A projection mechanism 24 for projecting a jet 22 of water 18 and glass beads 20 toward the metal component 12, and draining powder dust 20 a generated by the glass beads 20 being crushed on the surface of the metal component 12. Collection mechanism 26 that collects together
And the collected effluent is mixed with the water 18 and the powder dust 20.
a, and a powder dust container 31 for storing the separated powder dust 20a.

The metal component holding mechanism 16 includes a spindle unit 32 provided with a drive unit 30 in contact with one end of the metal component 12 and a support unit provided with a rotating unit 34 for supporting the other end of the metal component 12. Means 36. The spindle unit 32 is provided with a servomotor (not shown) for driving the drive unit 30 to rotate.
Is provided with a cylinder 40 for moving the rotating part 34 in the axial direction, and the supporting means 36 is configured to be capable of adjusting the position 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.
Is disposed in the processing chamber 14 a of the casing 14 while being protected by the bellows member 103. A nozzle 104 is attached to the tip of the arm 102, and a mixing chamber 106 for mixing the water 18 and the glass beads 20 is connected to an upper side of the nozzle 104. 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 processing chamber 14a to the outside, and the opening 14b is opened and closed via a double door 120 (see FIG. 1). Processing room 1
4a, the liquid ejecting means 130 constituting the collection mechanism 26 is provided.
Is arranged. As shown in FIG.
Is provided on the ceiling 14c side of the casing 14 and includes four water injection nozzles 132a to 132d for injecting a liquid, for example, water 18, into the processing chamber 14a at a wide angle. The injection angles and directions of the water injection nozzles 132a to 132d are set so that the water 18 can be injected into the entire inside of the processing chamber 14a.

The bottom 14d of the casing 14 is inclined toward one corner (see FIG. 3), and a water pipe 134 is disposed near the bottom 14d. As shown in FIG. 4, the water pipe 134 includes:
A water jet nozzle 136 for jetting water 18 for cleaning the lower surface side of the arm unit 102 of the robot 100 at a wide angle, and nozzles 138a to 138f for cleaning metal parts are provided.

As shown in FIG. 3, an outside air inlet 140 through which outside air can be introduced into the processing chamber 14a is provided on the upper side of one side portion 14e of the casing 14, while the one side portion 1e is provided.
A suction port 142 opened to the processing chamber 14a is formed at a lower side of 4e. A tube member 144 is connected to a lower portion of one side portion 14 e of the casing 14, and a discharge path 146 in the tube member 144 communicates with the suction port 142. Pipe member 14
4, a first chamber 148 communicating with the suction port 142 via the discharge path 146 is disposed, and a blower (suction unit) 152 is connected to the first chamber 148 via a second chamber 150. You.

As shown in FIGS. 3 and 5, the lower end of the first casing 154 constituting the first chamber 148 is connected to the pipe member 144. This first casing 154
Inside, a liquid ejecting means 156 is mounted, and when the water 18 is ejected from the liquid ejecting means 156,
Showering is performed in the first chamber 148. First
One end of the first tube 158 is connected to the upper part of the casing 154, and the other end of the first tube 158 is connected to the second tube 158.
It is fixed to the lower end of the side of the second casing 160 that forms the chamber 150.

A pipe 162 provided at the lower end of the second casing 160 is connected to the side of the first casing 154 in close proximity to the liquid ejecting means 156, while being connected to the upper end of the side of the second casing 160. Second pipe 164
Is connected to the blower 152. The upper side of the exhaust pipe 166 provided in the blower 152 and the pipe member 144 include:
A pipe 168 is connected.

A third casing 172 constituting a third chamber 170 is connected to the pipe member 144 and located between the processing chamber 14 a and the first chamber 148. This third
The opening diameter of the lower end of the casing 172 is
4 is smaller than the lower end opening diameter (see FIG. 3).
Liquid ejecting means 174 is mounted in the third casing 172 at a relatively upper position, and water 18 ejected from the liquid ejecting means 174 allows the third chamber 1 to be cooled.
The showering is performed in 70. Third casing 17
2 and the lower end of the side of the second casing 160,
Both ends of the third tube 176 are connected, and the third
One end of a fourth pipe 178 is connected to the lower side of the casing 172, and the other end of the fourth pipe 178 is connected to the powder dust storage unit 31.

At the lower end on the downstream side of the pipe member 144, the pipe 1
Centrifuge 180 constituting the sorting mechanism 28 via
Is connected. The separation mechanism 28 is disposed below the casing 14, and discharges the separated powdery solid 20 a to a centrifuge 180 constituting the separation mechanism 28, as shown in FIG. 2. Sludge outlet 182
And a liquid discharge port 184 for discharging the separated liquid water 18. Below the sludge discharge port 182, a sludge collection box 186 constituting the powder dust storage unit 31 is disposed, while the liquid discharge port 184 is provided with a first tank (clean tank) 190 via a switching discharge unit 188. And the second tank (dirty tank) 192 are selectively connected.

A fourth pipe 178 is connected to the upper side of the sludge collection box 186, and the sludge collection box 186 and the third chamber 170 are in communication. The first tank 190 is a tank for storing the water 18 from which the powder dust 20a has been completely removed, and has a relatively large capacity. The second tank 192 is a water tank containing the powder dust 20a. The storage tank 18 is set to have a smaller capacity than the first tank 190.

As shown in FIG. 6, in the first tank 190, a level sensor 194 is provided.
The water level within 90 is detected at four positions: an upper limit position, a discharge start position, a discharge stop position, and a lower limit position. 1st tank 1
90, a first pump 196 and a second pump 198 are disposed, and the first pump 196 is connected to the first tank 19.
The water 18 inside the casing 14 is supplied to the liquid ejecting means 130 in the casing 14 via the water path 200. Second pump 198
Has a function of discharging the water 18 in the first tank 190 to the outside. A third pump 202 is disposed in the second tank 192, and the third pump 202 communicates with a drainage inlet side of the centrifuge 180 via a pipe 204.

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

First, the rotating part 34 forming the support means 36 is operated under the action of the cylinder 40 with one end of the metal part 12 held by the driving part 30 of the spindle unit 32 forming the metal part holding mechanism 16. The metal component 12 is displaced toward the metal component 12 to support the other end of the metal component 12. And
Double door 120 is closed and opening 14b of casing 14 is opened.
Is closed, a servo motor (not shown) constituting the spindle unit 32 is driven to drive the metal part 12.
Is rotated (see FIG. 3).

At this time, the water 18 and the glass beads 2 are operated under the action of a high-pressure pump (not shown) constituting the projection mechanism 24.
0 is pumped into the mixing chamber 106 via lines 108 and 110, respectively. Therefore, a jet 22 of the water 18 and the glass beads 20 is projected from the nozzle 104 toward the metal component 12 with directivity.

Further, the nozzle 104 is
Is moved in a predetermined direction, that is, in the axial direction of the metal component 12 through the arm portion 102 constituting the metal component 1.
The compressive residual stress is applied to the entire outer periphery of the glass 2 via the glass beads 20, and the glass beads 20 are crushed. The powder dust 20a generated by the pulverization of the glass beads 20 is floating in the casing 14, and the liquid ejecting means 130 and the blower 152 constituting the recovery mechanism 26 are driven.

In the liquid ejecting means 130, as shown in FIG. 4, water 18 is ejected into the processing chamber 14a in the casing 14 through each of the water injection nozzles 132a to 132d, and floats in the processing chamber 14a. Dust 20a and the dust 20 adhering to the arm 102 of the robot 100
a is forcibly discharged to the bottom 14d side of the casing 14. Further, water 18 is jetted from a water jet nozzle 136 attached to the water pipe 134, and the lower side of the arm portion 102 is washed with the water 18 and the water 18 is jetted from each nozzle 138a to 138f. The cleaning operation of the metal component 12 is performed.

The waste liquid including the powder dust 20a generated at the time of washing by the liquid ejecting means 130 flows along the inclination of the bottom 14d, and as shown in FIGS.
The centrifugal separator 1 that constitutes the separation mechanism 28 via the pipe 179 from the discharge path 146 of the pipe member 144 connected to the centrifuge 1
Sent to 80.

On the other hand, when the blower 152 is driven, the inside of the second chamber 150 communicating with the blower 152 via the second pipe 164 is sucked, and the second chamber 1 is further sucked.
The inside of the first and third chambers 148, 170 communicating with the tube 50 via the first and third pipes 158, 176 are sucked. For this reason, a negative pressure is generated in the suction port 142 via the discharge path 146, and mist containing the powder dust 20 a floating in the processing chamber 14 a of the casing 14 is generated by the suction port 142.
Is sucked into the first and third chambers 148 and 170 through the discharge path 146 and decelerated.

Here, the opening diameter of the lower end of the first casing 154 is set to be larger than the opening diameter of the lower end of the third casing 172, and the powder dust 2 floating in the processing chamber 14a.
Oa is mainly sucked into the first chamber 148. This first
In the chamber 148, the showering is performed via the liquid ejecting means 156 arranged in the first casing 154, and the wastewater including the powder dust 20a is sent to the centrifugal separator 180 via the discharge passage 146 and the pipe 179. Sent. Similarly,
In the third chamber 170, showering is performed via the water 18 jetted from the liquid jetting means 174, and
Effluent containing Oa is introduced into the centrifuge 180.

The air in the first and second chambers 148 and 170 is sucked into the second chamber 150 via the first and second pipes 158 and 176 and decelerated.
The air is sucked into the blower 152 from the pipe 164 and
Is derived to the outside. At this time, the moisture generated in the second chamber 150 and the remaining powder dust 20a
The liquid is introduced into the first chamber 148 via 62 and discharged to the discharge path 146 by the showering of the liquid ejecting means 156. In addition, moisture generated in the exhaust pipe 166 is
It is introduced into the discharge channel 146 via 68.

In the processing chamber 14a, when suction is performed from the suction port 142, outside air can be introduced into the processing chamber 14a through the outside air inlet 140. For this reason, it is possible to effectively avoid unnecessary negative pressure in the processing chamber 14a.

In the centrifugal separator 180, since the predetermined number of revolutions is not reached immediately after the start of operation, there is a period during which the powder dust 20a and the water 18 cannot be completely separated from the waste liquid. For this reason, as shown in FIG. 6, the powder dust 20 a as a solid portion is discharged from the sludge discharge port 182 of the centrifugal separator 180 to the sludge collection box 186, while the powder dust 20 a
The water 18 containing a is introduced into the second tank 192 from the liquid discharge port 184 via the switching discharge means 188.

Next, the centrifugal separator supply pump (not shown) is driven, and after a predetermined time has elapsed from the start of operation of the centrifugal separator 180, the switching / discharging means 188 is driven. 18 discharged from water
Are stored in the first tank 190. First tank 19
0, the first tank 1 via the level sensor 194
The water level of the water 18 stored in 90 is detected, and the first pump 196 and the second pump 198 are selectively driven as necessary.

When the first pump 196 is driven, the water 18 in the first tank 190 is sent to the liquid ejecting means 130 constituting the recovery mechanism 26 via the water path 200. As a result, the water 18 is sprayed into the processing chamber 14a to clean the metal part 12 and the arm 102,
It is provided for the work of collecting the powder dust 20a floating in the inside 4a.
When the second pump 198 is driven, the first tank 1
The water 18 in 90 is discharged outside.

On the other hand, the powder dust 20a discharged from the centrifugal separator 180 is discharged to a sludge collection box 186 arranged corresponding to the sludge discharge port 182. At that time, as shown in FIG.
A fourth pipe 178 is connected to the upper side of the sludge collection box 186, and the powder dust 20a floating in the sludge collection box 186 is connected to the fourth pipe 178.
Is sucked into the third chamber 170 via the fourth tube 178. In the third chamber 170, the fourth tube 1
Liquid ejecting means 174 is provided so as to be located above the connection portion of the liquid discharge passage 78, and the dust 20 a is discharged from the discharge path 14 via water 18 ejected from the liquid ejecting means 174.
It is discharged to 6.

In the first embodiment, the first and third chambers 148 and 170 communicate with the lower side of the processing chamber 14a via the discharge path 146, and the first and third chambers 148 and 170 communicate with the first and third chambers 148 and 170. First and third tubes 15
8 and 176, a second chamber 150 communicates with the second chamber 150, and a blower 1 through a second pipe 164.
52 are in communication.

For this reason, when the blower 152 is driven,
Mist containing the powder dust 20a floating in the processing chamber 14a is smoothly introduced into the first and third chambers 148 and 170 from the suction port 142 and the discharge path 146, and decelerated. The showering is performed by the water 18 injected from the liquid injection units 156 and 174,
The drainage containing the powder dust 20 a is discharged to the discharge passage 146 and the pipe 17.
9 to a centrifuge 180. Further, the powder debris 20a introduced into the second chamber 150 is returned to the first chamber 148 via the pipe 162 together with moisture by being decelerated in the second chamber 150, and is returned to the discharge path 146 by showering. Is discharged.

Thus, the powder dust 20a floating in the processing chamber 14a can be reliably and efficiently sucked and collected, and the powder dust 20a adheres to the metal component holding mechanism 16. Therefore, the effect of continuously and efficiently performing the process of increasing the strength of the metal component 12 is obtained. In particular, since the suction port 142 is provided on the lower side of the processing chamber 14a, the powder dust 20a that is likely to float on the lower side due to its own weight and showering is smoothly and reliably sucked and collected in the processing chamber 14a. It becomes possible to do.
FIG. 7 shows a high-strength device 2 according to a second embodiment of the present invention.
FIG. 8 is a schematic front explanatory view of a collecting mechanism 212 constituting the apparatus 10, and FIG. The same components as those of the high-strength apparatus 10 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the second embodiment, only the first casing 154 constituting the first chamber 148 is connected to the discharge path 146, and the third chamber 170 used in the first embodiment is used. not being used. Therefore, in the high-strength apparatus 210, when the blower 152 is driven, the inside of the processing chamber 14a is sucked from the suction port 142 through the first and second chambers 148, 150, and floats in the processing chamber 14a. Powder dust 20a is in the suction port 1
42 and the first chamber 14 through the discharge path 146.
It is sucked into and decelerated.

In the first chamber 148, the wastewater containing the powder dust 20 a is discharged to the discharge passage 146 by the showering of the liquid ejecting means 156. On the other hand, the remaining powder dust 20a is sucked into the second chamber 150, decelerated, returned to the first chamber 148 from the pipe 162, and then discharged to the discharge passage 146 by showering. Thereby, the same effects as in the first embodiment can be obtained, such as the powder dust 20a floating in the processing chamber 14a can be reliably collected with a simple configuration.

In the first and second embodiments of the present invention, the second chamber 150 is used, but the blower 152 is directly connected to the first chamber 148 and / or the second chamber 150 without using the second chamber 150. It may be configured to communicate with the three chambers 170.

[0047]

In the apparatus for increasing the strength of a metal part according to the present invention, a chamber is provided in communication with a suction port opened to the lower side in the processing chamber, and the powder floating in the lower side in the processing chamber. The dust is sucked into the chamber under the action of the suction means, and the powder dust is collected by the liquid ejected from the fluid ejecting means. Therefore, with a simple configuration, it is possible to reliably and efficiently collect the powder dust floating in the processing chamber, and to avoid the adverse effect of the powder dust on the high-strength treatment as much as possible. Becomes possible. As a result, the process of increasing the strength of the metal component is continuously performed with high accuracy.

[Brief description of the drawings]

FIG. 1 is a schematic perspective explanatory view of a high-strength apparatus according to a first embodiment of the present invention.

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

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

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

FIG. 5 is another partial perspective view of the collection mechanism.

FIG. 6 is a circuit diagram of the high-strength device.

FIG. 7 is an explanatory front view of a collection mechanism constituting a high-strength device according to a second embodiment of the present invention.

FIG. 8 is a partial perspective explanatory view of the collecting mechanism shown in FIG. 7;

[Explanation of symbols]

10, 210 ... Strengthening device 12 ... Metal parts 14 ... Casing 14a ... Processing chamber 16 ... Metal parts holding mechanism 18 ... Water 20 ... Glass beads 20a ... Powder debris 22 ... Jet flow 24 ... Projection mechanism 26, 212 ... Recovery mechanism 28 Separation mechanism 31 Powder dust storage unit 100 Robot 104 Nozzles 130, 156, 1
74: liquid ejecting means 140: external air inlet 142: suction port 144: pipe member 146: discharge path 148, 150, 170: chamber 152: blower 154, 160, 172: casing 158, 164, 176, 178, 179: pipe Body 180 ... Centrifuge 186 ... Sludge collection box 188 ... Switching and discharging means 190,192 ... Tank

Claims (3)

[Claims] A metal part holding mechanism for positioning and holding the metal part in a processing chamber; and a metal part holding mechanism for positioning and holding the metal part in a processing chamber. A projection mechanism for projecting a jet of glass beads and a liquid from a nozzle; and a collection mechanism for collecting, together with drainage, powder dust generated by the glass beads being crushed on the surface of the metal component. A mechanism configured to include an outside air inlet through which outside air can be introduced into the processing chamber, a suction port opened to a lower side of the processing chamber, a chamber disposed in a discharge path formed in communication with the suction port, and the chamber. Suction means for sucking the powder dust in the processing chamber from the suction port into the chamber; and liquid ejecting means for ejecting liquid to the powder dust introduced into the chamber. Be prepared A metal part high-strength device characterized by the following features. 2. The high-strength apparatus according to claim 1, wherein the chamber accommodates the liquid ejecting means, and communicates with a first chamber that communicates with the discharge path, and communicates with a downstream side of the first chamber. And a second chamber to which the suction means communicates. 3. A high-strength apparatus according to claim 1, wherein a separating mechanism for separating the collected waste liquid into the liquid and the powder dust is disposed downstream of the collecting mechanism. An apparatus for increasing the strength of a metal component.