CN111315534A - Workpiece processing apparatus and scale removing method - Google Patents

Workpiece processing apparatus and scale removing method Download PDF

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Publication number
CN111315534A
CN111315534A CN201880071264.2A CN201880071264A CN111315534A CN 111315534 A CN111315534 A CN 111315534A CN 201880071264 A CN201880071264 A CN 201880071264A CN 111315534 A CN111315534 A CN 111315534A
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CN
China
Prior art keywords
slurry
processing apparatus
abrasive grains
workpiece processing
section
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Granted
Application number
CN201880071264.2A
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Chinese (zh)
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CN111315534B (en
Inventor
松原幸人
大仓弘至
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Macoho Co Ltd
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Macoho Co Ltd
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Publication of CN111315534A publication Critical patent/CN111315534A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
    • B24C1/086—Descaling; Removing coating films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C11/00—Selection of abrasive materials or additives for abrasive blasts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/08—Abrasive blasting machines or devices; Plants essentially adapted for abrasive blasting of travelling stock or travelling workpieces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/08—Abrasive blasting machines or devices; Plants essentially adapted for abrasive blasting of travelling stock or travelling workpieces
    • B24C3/10—Abrasive blasting machines or devices; Plants essentially adapted for abrasive blasting of travelling stock or travelling workpieces for treating external surfaces
    • B24C3/12—Apparatus using nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
    • B24C7/0007—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a liquid carrier
    • B24C7/0038—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a liquid carrier the blasting medium being a gaseous stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/02—Selection of particular materials
    • F04D29/026—Selection of particular materials especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2238—Special flow patterns
    • F04D29/2255—Special flow patterns flow-channels with a special cross-section contour, e.g. ejecting, throttling or diffusing effect
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/24—Vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/70—Shape
    • F05D2250/71—Shape curved
    • F05D2250/711—Shape curved convex
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/10—Metals, alloys or intermetallic compounds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/40—Organic materials
    • F05D2300/44—Resins

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

The invention aims to provide an unprecedented epoch-making workpiece processing device and a scale removing method. A work processing apparatus is provided with a slurry ejecting section (1) for ejecting a slurry (30) as a mixture of a liquid (30a) and abrasive grains (30b) onto a work (W) together with compressed air, wherein the work processing apparatus is provided with a slurry pressure-feeding section (2) for pressure-feeding the slurry (30) to the slurry ejecting section (1), the slurry pressure-feeding section (2) is provided with a rotating body (8) in a casing (7), a slurry introduction section (4) is provided in a bottom section (3) of the casing (7), a slurry introduction section (6) is provided in a side wall section (5) continuously provided around the bottom section (3) of the casing (7), a blade section (9) is provided in the rotating body (8), and the blade section (9) has a length in a radial direction from a rotational center section of the rotating body (8), and is convexly curved in the rotational direction.

Description

Workpiece processing apparatus and scale removing method
Technical Field
The present invention relates to a workpiece processing apparatus and a scale removing method.
Background
Conventionally, a metal wire drawing elongated material is stretched to a desired diameter by repeating heat treatment and wire drawing, and then used as a rod or wire material as it is, or cut into a bolt, a nut, or the like.
However, when the long wire-drawing member is heat-treated, hard scale is generated on the surface of the long wire-drawing member, but when the wire-drawing process is performed in a state where the scale is attached to the surface, the scale detached at the time of the wire-drawing process damages the material surface, and therefore the scale needs to be removed before the wire-drawing process.
Accordingly, the present applicant proposed a scale removal method disclosed in japanese patent application No. 2017-210538.
The scale removing method can remove scale satisfactorily by solving the problems of the following methods and the like: a method of removing the solvent by immersing the substrate in a chemical such as hydrochloric acid; alternatively, the method of projecting steel balls to break up the scale and remove it is accelerated.
Documents of the prior art
Patent document
Patent document 1: japanese patent application laid-open No. 2017-210538
Disclosure of Invention
Problems to be solved by the invention
However, although the scale removal method described above is performed using a workpiece processing apparatus (hereinafter, referred to as a conventional apparatus) provided with a slurry ejection portion that ejects a slurry that is a mixture of a liquid and abrasive grains, it was confirmed that, after the scale removal process was actually performed using the conventional apparatus: since the abrasive grains (stainless steel) used in this treatment have a higher specific gravity and a higher cutting force than the abrasive grains (alumina and silicon carbide) used heretofore, the abrasion at each part of the conventional apparatus is severe, and the abrasion at the slurry pressure-feeding section 52 that pressure-feeds the slurry to the slurry ejecting section is particularly severe.
That is, as shown in fig. 12 and 13, the slurry pumping section 52 includes a rotating body 58 in a casing 57, a slurry inlet 54 in a bottom portion 53 of the casing 57, a slurry outlet 56 in a side wall portion 55 provided continuously around the bottom portion 53, and blade portions 59 in the rotating body 58, the blade portions 59 having a length in a radial direction from a rotation center portion of the rotating body 58. The blade portion 59 is formed by covering a metal core member 59' with a synthetic resin.
Therefore, although the slurry 30 introduced into the casing 57 from the slurry inlet 54 is guided by the blade portions 59 in the radial direction from the rotational center of the rotor 58 and is pressure-fed and discharged from the slurry outlet 56 (see fig. 14), the abrasion of the tip portions of the slurry extruding surfaces 59a of the blade portions 59 is significant (see fig. 15), and therefore, the conventional apparatus has a disadvantage that the blade portions 59 need to be frequently replaced, which increases the cost. The reason for this can be presumed as: since the paste extruding surface 59a of the blade portion 59 is a flat surface (linear surface), the collision pressure of the paste 30 is concentrated.
The present applicant has made various experiments and studies with a view to the above problems, and as a result, has developed an innovative workpiece processing apparatus and a scale removing method which have not been developed before.
Means for solving the problems
The gist of the present invention is explained with reference to the drawings.
A first aspect of the present invention relates to a workpiece processing apparatus including a slurry ejecting portion 1, the slurry ejecting portion 1 ejecting a slurry 30, which is a mixture of a liquid 30a and abrasive grains 30b, onto a workpiece W together with compressed air, the workpiece processing apparatus including a slurry pressure-feeding portion 2 that pressure-feeds the slurry 30 onto the slurry ejecting portion 1, the slurry pressure-feeding portion 2 being configured such that a rotor 8 is provided in a casing 7, a slurry inlet 4 is provided in a bottom portion 3 of the casing 7, a slurry outlet 6 is provided in a side wall portion 5 continuously provided around the bottom portion 3 of the casing 7, a blade 9 is provided in the rotor 8, the blade 9 has a length in a radial direction from a rotational center portion of the rotor 8, the blade 9 is curved in a rotational direction, and the slurry 30 introduced from the slurry inlet 4 into the casing 7 is discharged from the blade 9 The rotation center of the rotating body 8 is guided in the radial direction and is fed and discharged under pressure from the slurry outlet port 6.
The invention according to claim 2 is a workpiece processing apparatus according to claim 1, wherein a plurality of the blade portions 9 are provided at predetermined intervals.
The 3 rd aspect of the present invention relates to the workpiece processing apparatus according to the 1 st aspect, wherein the cross section of the blade 9 is an arc shape in which a width a is widened from a rotation center portion of the rotating body 8 toward an outer side.
The present invention according to claim 4 is a workpiece processing apparatus according to claim 2, wherein the cross-section of the blade 9 has an arc shape in which a width a increases from a rotation center portion of the rotor 8 toward an outer side.
The invention according to claim 5 is a workpiece processing apparatus according to claim 1, wherein the bottom 3 of the housing 7 has a slope that slopes downward toward the slurry inlet 4.
The present invention according to claim 6 is a workpiece processing apparatus according to claim 2, wherein the bottom 3 of the housing 7 has a slope that slopes downward toward the slurry inlet 4.
The invention according to claim 7 relates to the workpiece processing apparatus according to claim 3, wherein the bottom 3 of the housing 7 has a slope that slopes downward toward the slurry inlet 4.
The 8 th aspect of the present invention is directed to the workpiece processing apparatus according to the 4 th aspect, wherein the bottom 3 of the casing 7 has a slope that slopes downward toward the slurry introduction port 4.
A 9 th aspect of the present invention is directed to the workpiece processing apparatus according to the 5 th aspect, wherein the inclination of the bottom portion 3 is 8 to 12 degrees.
A 10 th aspect of the present invention is directed to the workpiece processing apparatus according to the 6 th aspect, wherein the inclination of the bottom portion 3 is 8 to 12 degrees.
The 11 th aspect of the present invention relates to the workpiece processing apparatus, wherein in the 7 th aspect, the inclination of the bottom portion 3 is 8 to 12 degrees.
The 12 th aspect of the present invention relates to the workpiece processing apparatus, wherein in the 8 th aspect, the inclination of the bottom portion 3 is 8 to 12 degrees.
A 13 th aspect of the present invention relates to the workpiece processing apparatus, wherein in any one of the 1 st to 12 th aspects, a slurry passage 21 formed between the rotating body 8 and the side wall portion 5 of the housing 7 is configured to be gradually widened toward the slurry outlet port portion 6.
A 14 th aspect of the present invention relates to a scale removing method for removing scale generated on a surface of a workpiece W using the workpiece processing apparatus described in the 1 st aspect, wherein the scale removing method sprays a slurry 30, which is a mixture of a liquid 30a and abrasive grains 30b described below, and compressed air, while mixing the slurry with the compressed air, on the surface of the workpiece W.
Wherein the abrasive grains 30b are made of stainless steel, the abrasive grains 30b have a Vickers hardness of 700 to 800Hv, and 85 wt% of the abrasive grains 30b have a particle diameter of 90 μm or more and less than 200 μm.
The 15 th aspect of the present invention is directed to the scale removing method according to the 14 th aspect, wherein the abrasive grains 30b have a chromium content of 30% by weight or more.
A 16 th aspect of the present invention is directed to a scale removing method according to the 14 th aspect, wherein amorphous grains shown in fig. 10 are used as the abrasive grains 30 b.
A 17 th aspect of the present invention relates to a scale removing method according to the 15 th aspect, wherein amorphous grains shown in fig. 10 are used as the abrasive grains 30 b.
An 18 th aspect of the present invention is directed to the scale removing method according to the 14 th aspect, wherein abrasive grains having an average grain size of about 150 μm are used as the abrasive grains 30 b.
A 19 th aspect of the present invention is directed to the scale removing method according to 15 th aspect, wherein abrasive grains having an average grain size of about 150 μm are used as the abrasive grains 30 b.
The 20 th aspect of the present invention is directed to the scale removing method according to the 16 th aspect, wherein abrasive grains having an average grain size of about 150 μm are used as the abrasive grains 30 b.
The 21 st aspect of the present invention relates to the scale removing method according to the 17 th aspect, wherein abrasive grains having an average grain size of about 150 μm are used as the abrasive grains 30 b.
A 22 nd aspect of the present invention relates to a scale removing method, wherein in any one of the 14 th to 21 th aspects, a long wire drawing member having a vickers hardness of 200 to 400Hv is used as the workpiece W.
ADVANTAGEOUS EFFECTS OF INVENTION
Since the present invention is configured as described above, it becomes an unprecedented work processing apparatus and scale removing method that can dramatically improve the durability and the like of the slurry pressure feed section.
Drawings
Fig. 1 is an explanatory view of a state of use of the workpiece processing apparatus according to the present embodiment.
Fig. 2 is an explanatory view of a scale removing method using the workpiece processing apparatus according to the present embodiment.
Fig. 3 is an explanatory cross-sectional view of a main portion according to the present embodiment.
Fig. 4 is an exploded perspective view of a main part according to the present embodiment.
Fig. 5 is an explanatory diagram of a main part according to the present embodiment.
Fig. 6 is an explanatory diagram of the operation of the main part according to the present embodiment.
Fig. 7 is an explanatory cross-sectional view of a main portion according to the present embodiment.
Fig. 8 is a photograph showing a wear state of a main portion relating to the present embodiment.
Fig. 9 is a table showing the composition of abrasive grains 30b used in the scale removing method according to the present embodiment.
Fig. 10 is an enlarged photograph of abrasive grains 30b used in the scale removing method according to the present embodiment.
Fig. 11 is a table showing the results of comparative experiments between the scale removal method according to the present example and the conventional method.
Fig. 12 is an explanatory cross-sectional view of a main part of the conventional example.
Fig. 13 is a perspective view of a main part of the conventional example.
Fig. 14 is an explanatory diagram of the operation of the main part according to the present embodiment.
Fig. 15 is a photograph showing a wear state of a main portion according to the present embodiment.
Detailed Description
The operation of the present invention is shown to simply explain preferred embodiments of the present invention, based on the accompanying drawings.
When the slurry 30, which is a mixture of the liquid 30a and the abrasive grains 30b, is ejected together with the compressed air toward the workpiece W, the slurry 30 is pressure-fed from the slurry pressure-feeding section 2 to the slurry ejection section 1.
Specifically, the slurry 30 introduced into the casing 7 from the slurry inlet 4 with the rotation of the rotor 8 is guided in the radial direction from the center of the rotation of the rotor 8 by the paddle units 9, and is fed and discharged under pressure from the slurry outlet 6.
However, the blade portions 9 provided in the rotor 8 according to the present invention have a length in the radial direction from the rotation center portion of the rotor 8 and are convexly curved in the rotation direction, and according to this configuration, the wear of the blade portions 9 is reduced as much as possible.
Namely, it is assumed that: unlike the conventional device described above, the slurry extruding surface 9a of the blade 9 of the present invention is not a flat surface (linear surface) but a convexly curved surface, and the slurry 30 is not intensively collided with a part thereof, and the slurry 30 is smoothly and outwardly discharged along the convexly curved surface, so that the collision of the slurry 30 is dispersed and not concentrated, and the abrasion of the slurry extruding surface 9a is reduced as much as possible.
Examples
Specific embodiments of the present invention will be described with reference to the accompanying drawings.
The present embodiment is a workpiece processing apparatus provided with a slurry ejecting section 1, and the slurry ejecting section 1 ejects a slurry 30, which is a mixture of a liquid 30a and abrasive grains 30b, to a workpiece W together with compressed air, and the workpiece processing apparatus is used when the following method is performed: a metal wire drawing long strip W as a workpiece W to be described later is subjected to a heat treatment to remove scale S formed on the surface.
Specifically, as shown in fig. 1 and 2, the workpiece processing apparatus includes: a work conveying section 11 for conveying the long wire drawing member W; and a workpiece processing section 12 for performing wet blasting on the long wire drawing member W conveyed by the workpiece conveying section 11.
As shown in fig. 1, the work conveying unit 11 is configured by arranging a plurality of conveying rollers 11a at intervals in a box-shaped base 10, the plurality of conveying rollers 11a mounting the long wire drawing member W in a bridged state, and the work conveying unit 11 continuously conveys the long wire drawing member W to be processed from an introduction portion disposed on one side (upstream side) of the base 10 to a discharge portion disposed on the other side (downstream side) of the base 10.
The long wire drawing member W conveyed by the workpiece conveying section 11 is subjected to wet blasting by the workpiece treatment section 12 during the conveyance.
Specifically, the workpiece processing section 12 has the following structure: as shown in fig. 1 and 2, the slurry spraying device is disposed on a base 10 through which a long wire drawing material W passes, and includes a slurry spraying section 1, a slurry reservoir section 13 disposed at a lower position, and a slurry transport section 14 for transporting a slurry 30 from the slurry reservoir section 13 to the slurry spraying section 1 via a slurry pumping section 2 described later, and the slurry 30 sprayed from the slurry spraying section 1 is transported to the slurry reservoir section 13 and reused.
As shown in fig. 1 and 2, a plurality of (6) slurry ejecting portions 1 are provided in the base 10 around the long wire drawing member W conveyed by the work conveying portion 11.
The slurry transport unit 14 described above is connected to each of the slurry ejecting units 1, and a compressed air transport unit 15a provided in another circuit and extending from the compressed air supply unit 15 is connected thereto, so that the slurry 30 supplied from the slurry transport unit 14 is accelerated by the compressed air supplied from the compressed air transport unit 15a and ejected from the slurry ejecting unit 1 at a predetermined ejection speed.
As shown in fig. 2, each of the slurry ejecting portions 1 is configured as follows: each of the slurry ejecting portions 1 is provided at a position spaced apart by a predetermined interval in the conveying direction of the long wire drawing member W (a position shifted by an equal interval in the axial direction of the long wire drawing member W) and at a position shifted by an equal interval in the circumferential direction of the long wire drawing member W (a 60-degree interval), and ejects the slurry 30 to the entire circumferential surface of the long wire drawing member W by 6 slurry ejecting portions 1.
Therefore, the slurry 30 ejected from each of the slurry ejection portions 1 can be ejected satisfactorily onto the long wire drawing member W without colliding with each other.
In the present embodiment, 2 slurry spraying units for spraying the slurry 30 to the entire circumferential surface of the long wire drawing member W by the 6 slurry spraying portions 1 are provided in the conveying direction of the long wire drawing member W. Therefore, a total of 12 slurry ejecting portions 1 are provided in the conveying direction of the long wire drawing material W. In addition, the number of the slurry ejecting sections 1 may be set as appropriate.
Further, the present embodiment includes a slurry pressure-feeding unit 2 that pressure-feeds the slurry 30 to the slurry ejecting unit 1.
As shown in fig. 1 and 3, the slurry pumping unit 2 has a structure in which a rotor 8 is provided in a casing 7.
Specifically, the case 7 is formed by providing a hollow portion at the lower end of a cylindrical base 16, wherein a drive motor 17 is disposed at the upper end of the base 16, and the case 7 is formed by a first case half body 7 'integrally formed at the lower end of the base 16 and a second case half body 7 ″ overlapped and fastened to the first case half body 7'.
A communication port 7a communicating with the internal space 16a of the base 16 is provided in the center of the ceiling wall of the housing 7, and the distal end portion of a rotation drive shaft 17a of a drive motor 17 penetrating the internal space 16a of the base 16 through the communication port 7a is disposed in the housing 7. Further, a rotating body 8 is provided at a distal end portion of the rotation driving shaft 17 a.
A gap is provided between the inner space 16a of the base 16 and the circumferential surface of the rotation drive shaft 17 a.
The gap is an excess slurry passage portion 18 through which excess slurry 30 not discharged from a slurry discharge portion 6 described later out of the slurry 30 introduced into the casing 7 passes, and the base 16 is further provided with an excess slurry discharge portion 19 which discharges the excess slurry 30 passing through the excess slurry passage portion 18.
In the present embodiment, a cylindrical body 20 made of stainless steel with a chrome-plated surface is fitted around the rotation drive shaft 17a, and the excess slurry passage portion 18 and the inner surface of the housing 7 are covered with a synthetic resin member (urethane).
Therefore, the cylindrical body 20 and the portions covered with the synthetic resin member are protected from contact with the abrasive grains 30b, thereby preventing abrasion.
A slurry inlet 4 is provided in the bottom 3 of the casing 7, and a slurry outlet 6 is provided in a side wall 5 provided continuously around the bottom 3.
The bottom 3 of the casing 7 has a slope inclined downward toward the slurry introduction portion 4.
Therefore, when the flow of the slurry 30 is stopped due to the stop of the driving motor 17, the abrasive grains 30b in the slurry 30 tend to be accumulated on the bottom portion 3, but the abrasive grains 30b flow down due to the slope of the bottom portion 3, and the accumulation is reduced.
In the present embodiment, the slope of the bottom portion 3 is set to about 10 degrees (see fig. 7).
This is because the steeper the slope of the bottom portion 3, the less abrasive particles 30b are deposited, but the steeper the slope, the slurry 30 introduced from the slurry inlet 4 collides violently, and the abrasion becomes severe.
Therefore, the applicant of the present invention has tried various angles and found that about 10 degrees (in the range of 8 to 12 degrees) is preferable as an angle which can suppress the accumulation of the abrasive grains 30b in the bottom portion 3 and which makes the bottom portion 3 less likely to be worn.
In the present embodiment, the slurry passage 21 formed between the blade 9 of the rotor 8 and the casing 7 (the bottom portion 3, the side wall portion 5, and the top portion) is configured to gradually widen toward the slurry outlet 6 (see fig. 5).
Namely, the following configuration is adopted: the rotation center of the rotating body 8 coincides with the opening axis of the slurry inlet opening 4, and the distance from the rotation center of the rotating body 8 and the opening axis of the slurry inlet opening 4 to the side wall 5 of the casing 7 increases toward the slurry outlet 6.
This is for: the speed of the slurry 30 guided by the rotation of the rotating body 8 is increased at most, and the abrasion in the vicinity of the slurry outlet port portion 6, which is easily abraded, is reduced as much as possible.
Actually, a comparative test concerning durability was performed between the present embodiment and the conventional device, and as a result, the time required to replace the outer case 57 (the second case half 57 'that is overlapped and fastened to the first case half 57' integrally formed with the lower end of the base 60) was 3000 hours in the conventional device, whereas the time required to replace the outer case 7 (the second case half 7 ") was dramatically increased to 5000 hours in the present embodiment.
A rotating body 8 provided at the distal end portion of the rotation driving shaft 17a is disposed in the housing 7.
The rotor 8 is a disk-shaped body, and the rotor 8 has a surface provided with blade portions 9, and the blade portions 9 have a length in the radial direction from the rotation center portion of the rotor 8 and are convexly curved in the rotation direction.
The slurry 30 introduced into the slurry reservoir 13 is introduced from the slurry inlet 4 by rotating the rotor 8, and the slurry 30 introduced into the casing 7 from the slurry inlet 4 is guided radially from the center of rotation of the rotor 8 by the blade portions 9 and is discharged under pressure from the slurry outlet 6.
The blade unit 9 is configured such that a metal core member 9 'is covered with a synthetic resin (blade member 9 "), wherein the core member 9' is detachably provided at the lower end portion of the rotating drive shaft 17a, and in the present embodiment, a plurality (6) of blade units 9 are provided at predetermined intervals (equal intervals) in the circumferential direction.
The cross section of each blade 9 is arc-shaped with a width a that widens outward from the center of rotation of rotor 8, and the lower surface (height direction end surface) of each blade 9 is shaped (parallel) along bottom 3 (see fig. 3).
Therefore, the slurry pressing surface 9a of the blade 9 is a convexly curved surface.
The convex curved surface (slurry pressing surface 9a) is preferably an arc having a radius of 50mm to 60mm, and is set to 54.5mm in the present embodiment.
Since the present embodiment is configured as described above, when the slurry 30, which is a mixture of the liquid 30a and the abrasive grains 30b, is ejected toward the workpiece W together with the compressed air, the slurry 30 is pressure-fed from the slurry pressure-feeding section 2 to the slurry ejection section 1.
Specifically, the slurry 30 introduced into the casing 7 from the slurry inlet 4 with the rotation of the rotor 8 is guided in the radial direction from the rotation center of the rotor 8 by the paddle units 9, and is fed and discharged under pressure from the slurry outlet 6 (see fig. 6).
The blade portions 9 provided on the rotor 8 according to the present embodiment have a length in the radial direction from the rotation center portion of the rotor 8 and are convexly curved in the rotation direction, and this structure reduces wear of the blade portions 9 as much as possible.
Actually, a comparative test on durability was performed between the present example and the conventional apparatus, and as a result, the time required to replace the blade portion 59 was 700 hours in the conventional apparatus, whereas the time required to replace the blade portion 9 was dramatically increased to 2000 hours in the present example.
Thus, according to the present embodiment, the durability of the slurry-feeding section 2 can be dramatically improved.
In addition, since the plurality of blade portions 9 in the present embodiment are provided at predetermined intervals, the slurry 30 can be reliably guided.
In the present embodiment, the cross section of blade portions 9 is in the shape of an arc having a width a that widens outward from the rotational center of rotor 8, and therefore the above-described operational effects can be reliably achieved.
Further, since the bottom portion 3 of the housing 7 in the present embodiment has a slope inclined downward toward the slurry introduction portion 4, accumulation of the abrasive particles 30b can be suppressed, and abrasion of the bottom portion 3 can be reduced.
In addition, since the inclination of the bottom portion 3 in the present embodiment is 8 to 12 degrees, the above-described operation and effect can be reliably obtained.
In addition, in the present embodiment, since the slurry passage 21 formed between the rotating body 8 and the side wall portion 5 of the casing 7 is configured to be gradually widened toward the slurry outlet portion 6, the collision of the slurry 30 can be dispersed without being concentrated even in this point, and the durability of the slurry pumping section 2 can be improved.
The workpiece processing apparatus according to the present embodiment is used for performing the following method: the scale S generated on the surface is removed by heat-treating the metal wire drawing long strip W.
Specifically, the slurry 30, which is a mixture of the liquid 30a and the abrasive grains 30b, is mixed with compressed air and then sprayed onto the surface of the long wire drawing member W.
As the abrasive grains 30b, amorphous grains made of stainless steel having the composition shown in fig. 9 (see fig. 10) were used.
Using the workpiece processing apparatus having the above structure, surface treatment of a long wire drawing W (having a vickers hardness of 200 to 400Hv) was performed under the following conditions.
Abrasive grain … … stainless steel abrasive grain with Vickers hardness of 700-800 Hv
Average particle diameter of 150 μm (85 wt% particle diameter of 90 μm or more and less than 200 μm)
Air pressure … … 0.4.4 MPa
Treatment speed (conveying speed of long condition W for drawing) … … 30m/min
The average particle diameter of the abrasive grains 30 referred to in the present specification is defined by a mode diameter (a particle diameter having the highest frequency of appearance in a distribution), and a value thereof is obtained by a measurement method in which the particles are irradiated with laser light and measured.
When the treatment is performed under the above conditions, the scale S generated on the surface of the long wire drawing member W is satisfactorily removed, and the abrasive grains 30 themselves are not damaged.
Fig. 11 shows the results of comparative experiments between the present example and the conventional treatment method (shot blasting).
The surface roughness (arithmetic mean roughness and roughness pitch) of the treated long wire drawing member W is smaller in the present example than in the conventional example.
Therefore, in the present embodiment, not only the scale S can be removed from the surface of the long wire drawing material W, but also fine irregularities can be formed on the surface of the long wire drawing material W, and the lubricant during the wire drawing process can be satisfactorily retained.
The surface hardness after the treatment of the present example was lower than that of the conventional method.
This is because the conventional method treats the surface of the long wire drawing member W by striking the treated surface with abrasive grains having a large average grain size (steel balls having an average grain size of 0.3 to 1 mm), and thus hardens the surface, whereas the present embodiment treats the treated surface by grinding with abrasive grains having a smaller average grain size than the conventional method, and thus reduces the surface hardening of the long wire drawing member W as much as possible.
Thus, according to the present embodiment, it can be said that the method is effective as a method for treating the long wire-drawing member W (the surface hardening of the long wire-drawing member W is not good for wire-drawing processing).
Further, since the content of chromium in the passive state coating film to be rust-proof in the abrasive grains 30 of the present embodiment is 30% by weight or more, the abrasive grains 30 of the present embodiment are extremely less likely to rust, and it is also found that the abrasive grains 30 of the present embodiment are useful as the abrasive grains 30 used in the wet blasting.
The present invention is not limited to the present embodiment, and the specific configuration of each component can be appropriately designed.

Claims (22)

1. A workpiece processing apparatus provided with a slurry ejecting section that ejects a slurry, which is a mixture of a liquid and abrasive grains, onto a workpiece together with compressed air, characterized in that,
the work processing apparatus is provided with a slurry pressure-feeding section for pressure-feeding the slurry to the slurry ejecting section, and the slurry pressure-feeding section is configured such that a rotor is provided in a casing, a slurry inlet is provided in a bottom portion of the casing, a slurry outlet is provided in a side wall portion provided continuously around the bottom portion of the casing, and a blade portion having a length in a radial direction from a rotational center portion of the rotor and curved so as to protrude in the rotational direction is provided in the rotor, and the slurry introduced from the slurry inlet into the casing is guided by the blade portion in the radial direction from the rotational center portion of the rotor and pressure-fed out from the slurry outlet.
2. The workpiece processing apparatus according to claim 1,
the blade portions are provided in plurality at predetermined intervals.
3. The workpiece processing apparatus according to claim 1,
the blade portions have an arc-shaped cross section, the width of which increases from the center of rotation of the rotor toward the outside.
4. The workpiece processing apparatus according to claim 2,
the blade portions have an arc-shaped cross section, the width of which increases from the center of rotation of the rotor toward the outside.
5. The workpiece processing apparatus according to claim 1,
the bottom of the housing has a slope that slopes downward toward the slurry introduction portion.
6. The workpiece processing apparatus according to claim 2,
the bottom of the housing has a slope that slopes downward toward the slurry introduction portion.
7. The workpiece processing apparatus according to claim 3,
the bottom of the housing has a slope that slopes downward toward the slurry introduction portion.
8. The workpiece processing apparatus according to claim 4,
the bottom of the housing has a slope that slopes downward toward the slurry introduction portion.
9. The workpiece processing apparatus according to claim 5,
the inclination of the bottom is 8-12 degrees.
10. The workpiece processing apparatus according to claim 6,
the inclination of the bottom is 8-12 degrees.
11. The workpiece processing apparatus according to claim 7,
the inclination of the bottom is 8-12 degrees.
12. The workpiece processing apparatus according to claim 8,
the inclination of the bottom is 8-12 degrees.
13. The workpiece processing apparatus according to any one of claims 1 to 12,
the slurry passage formed between the rotating body and the side wall portion of the casing is configured to gradually widen toward the slurry outlet port portion.
14. A scale removing method for removing scale generated on a surface of a workpiece using the workpiece processing apparatus according to claim 1,
a slurry which is a mixture of a liquid and abrasive grains described below is sprayed onto the surface of the workpiece while being mixed with compressed air,
wherein the abrasive grains are made of stainless steel, and have a Vickers hardness of 700 to 800Hv, and 85 wt% of the abrasive grains have a particle diameter of 90 to less than 200 μm.
15. A scale removing method as defined in claim 14,
the chromium content of the abrasive grains is more than 30 wt%.
16. A scale removing method as defined in claim 14,
as the abrasive grains, amorphous grains as shown in fig. 10 were used.
17. A scale removing method as defined in claim 15,
as the abrasive grains, amorphous grains as shown in fig. 10 were used.
18. A scale removing method as defined in claim 14,
as the abrasive grains, abrasive grains having an average grain diameter of about 150 μm were used.
19. A scale removing method as defined in claim 15,
as the abrasive grains, abrasive grains having an average grain diameter of about 150 μm were used.
20. The scale removing method as recited in claim 16,
as the abrasive grains, abrasive grains having an average grain diameter of about 150 μm were used.
21. The scale removing method as recited in claim 17,
as the abrasive grains, abrasive grains having an average grain diameter of about 150 μm were used.
22. A scale removing method as defined in any one of claims 14 to 21,
the workpiece is a long wire drawing member having a Vickers hardness of 200 to 400 Hv.
CN201880071264.2A 2017-11-07 2018-10-05 Oxide skin removing device Active CN111315534B (en)

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PCT/JP2018/037349 WO2019093041A1 (en) 2017-11-07 2018-10-05 Workpiece processing apparatus and oxide scale removal method

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EP3708301A4 (en) 2021-08-18
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EP3708301A1 (en) 2020-09-16
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