EP3519133A1 - Appareil et procédé de découpe à jet d'eau - Google Patents

Appareil et procédé de découpe à jet d'eau

Info

Publication number
EP3519133A1
EP3519133A1 EP17788309.7A EP17788309A EP3519133A1 EP 3519133 A1 EP3519133 A1 EP 3519133A1 EP 17788309 A EP17788309 A EP 17788309A EP 3519133 A1 EP3519133 A1 EP 3519133A1
Authority
EP
European Patent Office
Prior art keywords
abrasive
suspension
water
abrasive material
particles
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP17788309.7A
Other languages
German (de)
English (en)
Inventor
Giancarlo PASTORI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eurowaterjet Srl
Original Assignee
Eurowaterjet Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eurowaterjet Srl filed Critical Eurowaterjet Srl
Publication of EP3519133A1 publication Critical patent/EP3519133A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B24C1/04—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for treating only selected parts of a surface, e.g. for carving stone or glass
    • B24C1/045—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for treating only selected parts of a surface, e.g. for carving stone or glass for cutting
    • 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
    • B24C11/005—Selection of abrasive materials or additives for abrasive blasts of additives, e.g. anti-corrosive or disinfecting agents in solid, liquid or gaseous form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
    • B24C5/04—Nozzles therefor
    • 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
    • B24C7/0015—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 with control of feed parameters, e.g. feed rate of abrasive material or carrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
    • B24C9/006—Treatment of used abrasive material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Definitions

  • the present invention relates to an apparatus for water jet cutting and in particular to an apparatus in which the water jet comprises water and dispersed abrasive particles.
  • the invention also relates to a method for performing the water jet cut by means of the aforesaid apparatus.
  • Water jet cutting is a technology used to cut and/or shape workpieces made of various types of materials, making use of a very high pressure jet of water. This type of technology is commonly known as "Waterjet”.
  • water should not be understood as limited to pure water (H 2 0) as working fluid.
  • water refers to any fluid, if necessary mixed with solid particles, capable of flowing through a tube or an orifice of a nozzle.
  • Apparatus used for water jet cutting are generally provided with a cutting head capable of delivering, through a specific nozzle, a very thin jet of water, with a diameter between 0.1 mm and 0.4 mm, at very high pressure, up to 6,000 bar and more.
  • abrasive particles are dispersed in the water to increase the erosive capacity of the water jet.
  • Abrasive water jet Abrasive Suspension Jet
  • ASJ Abrasive Slurry Jet
  • the high pressure fluid typically water
  • the abrasive in the form of dry powdery particles
  • the wet abrasive particles are collected and sent to recovery centers equipped with systems dedicated to the filtration, selection and drying of the reusable particles.
  • the abrasive and a fluid are mixed, obtaining a suspension (called "slurry").
  • the fluid comprises water and additives to form a suspension that maintains the abrasive particles suspended in said fluid for a given period of time. With this arrangement, the particles are prevented from precipitating downward and accumulating with the risk of blocking the apparatus.
  • This suspension is then pressurized and conveyed toward the nozzle.
  • the two flows are mixed upstream of the nozzle, while in others they are mixed directly in the mixing chamber of the nozzle.
  • the object of the present invention is to propose an apparatus and a method for water jet cutting that overcome the problems of the prior art described above.
  • an object of the present invention is to propose an apparatus for water jet cutting that can be used without limitations in a wide range of applications.
  • Another object of the present invention is to propose an apparatus, and a related method, that guarantees an improved penetration capacity in hard materials and at the same time an improved finish of the machined surface.
  • Another object of the present invention is to propose an apparatus for water jet cutting that is simple to produce, therefore inexpensive, and that requires limited maintenance.
  • a further object of the present invention is to provide an apparatus and a method for water jet cutting that allow the operating cost of the machining operations to be greatly reduced.
  • a further object of the present invention is to produce an apparatus and a method for water jet cutting that enables the environmental impact of the waste materials to be reduced.
  • an apparatus for water jet cutting comprising: a water source;
  • pumping means in communication with the water source, to generate a high pressure water flow
  • a tank containing an abrasive material in suspension wherein said abrasive material in suspension comprises a fluid and abrasive particles dispersed homogeneously in the aforesaid fluid; and a cutting head in fluid communication with said pumping means and said tank of the abrasive material in suspension, said cutting head comprising a mixing chamber for mixing the water and the abrasive material in suspension.
  • the source of abrasive material in suspension is in communication with said cutting head by means of an abrasive inlet channel.
  • the cutting head is instead configured to generate a vacuum pressure that draws the abrasive material in suspension through said abrasive inlet channel toward the mixing chamber.
  • the abrasive material in suspension is not pumped at very high pressure toward the nozzle, but is only transported, preferably at atmospheric pressure, toward the mixing chamber in which it is intercepted by the high speed water jet before entering the focusing tube.
  • This suction is caused by the Venturi effect that is created in the mixing chamber when the flow of pressurized water is made to pass through a narrow orifice before flowing into the aforesaid mixing chamber.
  • Tests carried out by the applicant show that the apparatus thus configured guarantees, with the same water pressure and the same type and amount of abrasive material, an increased cutting depth and improved surface finish (i.e., less roughness) relative to a conventional system of AWJ type.
  • the more orderly flow of the abrasive particles inside the focusing tube allows a reduction of the wear of this component relative to an aforesaid AWJ system.
  • the inlet channel of the abrasive material can be equipped with flow regulating means of the abrasive material in suspension.
  • the abrasive material in suspension comprises abrasive particles dispersed in a liquid or, preferably, gelatinous substance.
  • said gelatinous substance comprises at least water and a gelling agent.
  • the volume ratio between the abrasive particles and the liquid or gelatinous substance is preferably from 1 :3 to 1 :7.
  • said cutting head comprises a focusing tube of the jet (or nozzle) with a diameter preferably between 0.5 mm and 1.3 mm.
  • the nozzle has a length preferably between 100 mm and 200 mm.
  • the flow regulating means are mounted at an outlet of the abrasive material of the aforesaid tank.
  • Said flow regulating means can comprise, for example, an opening, through which the abrasive material in suspension can flow, and a moving partition, associated with control means, adapted to obstruct or partly or totally free the aforesaid opening.
  • This system particularly simple, allows rapid dosing of the amount of abrasive material present in the water jet delivered.
  • the regulating system thus produced allows rapid calibration of the apparatus as a function of the material of the object to be processed and of its dimensions.
  • the apparatus can comprise a mixing device to mix the water, the gelling agent and the particles of abrasive material to fonn the abrasive material in suspension.
  • Said mixing device is preferably equipped with pumping means to transfer the abrasive material in suspension into the tank.
  • the apparatus can comprise dosing means, associated with said mixing device, to dose the water, the gelling agent and the particles of abrasive material to form the abrasive material in suspension.
  • the apparatus thus configured is particularly effective to carry out continuous or, in any case, lengthy machining operations, as it allows an abrasive material in suspension with constant properties to be fed to the source throughout the whole of the machining process.
  • the apparatus can further comprise: a collection container to collect the water and the abrasive material, delivered from the cutting head, and the waste material from processing;
  • a recovery and recycling system of the abrasive material that includes at least:
  • the apparatus allows the abrasive material still usable to be recycled and re-introduced into the machining process.
  • This recycling step of the abrasive material allows a significant reduction in the operating costs of the apparatus, both of those for purchasing the abrasive material and of those for its disposal.
  • the abrasive material most widely used for water jet cutting is garnet, well known to those skilled in the art. While on the one hand this material guarantees excellent performance, due to its high level of hardness and resilience, on the other hand it is particularly costly. In fact, it is estimated that, on average, the costs for purchasing garnet abrasive can represent up to 40% - 60% of the operating cost of the apparatus.
  • Known systems for abrasive recycling are provided with means to separate and eliminate, from the material collected, both particles with a size below a given threshold, which can comprise powdered particles of abrasive and of the material of the processed workpiece, and particles with a size above a given threshold, which generally comprise only material of the processed workpiece.
  • the particles of the correct size which are therefore recyclable, are dried and stored to be re-introduced into the machining cycle.
  • this drying step precedes the separation step and is carried out on the whole mass of abrasive material collected from the collection tank. In other systems, separation of the recyclable abrasive particles instead takes place before the drying step.
  • Recycling systems thus produced are characterized by very high energy consumption, due mainly to the particle drying step. In fact, this energy consumption makes the recycling step particularly costly, to the extent that the cost of the recycled abrasive is substantially the same as that of the material purchased from the manufacturer.
  • the mass of recyclable abrasive material can be re-introduced into the apparatus still wet, eliminating the need for the drying step.
  • the recovery and recycling system is equipped with pumping means to convey said wet mass of reusable abrasive particles into the mixing device.
  • the step of preparing the abrasive material in suspension comprises the stage of mixing the fluid and the abrasive particles to disperse them homogeneously therein. Said mixing is preferably carried out in a tank comprising agitator means.
  • the step of preparing the abrasive material in suspension comprises a further stage, preceding the mixing stage, consisting of dosing the fluid and the abrasive particles.
  • said fluid is a gelatinous substance.
  • the method comprises the stage of mixing water, at least one gelling agent and particles of abrasive to form said gelatinous substance.
  • the method can then comprise a further stage, preceding the mixing stage, consisting of dosing the water, the gelling agent and the abrasive particles.
  • the abrasive material in suspension prepared is, preferably, pumped into a tank from which it is then conveyed into the mixing chamber.
  • the fact of dispersing the abrasive particles in a gelatinous substance offers the advantage of being able to store the abrasive material in the tank for many hours without the particles precipitating downward, i.e., depositing on the bottom of the tank.
  • the apparatus thus has a stock of material in suspension ready for use that allows it to be started immediately and at any time.
  • the step of dosing and subsequent mixing of the water, of the gelling agent and of the abrasive particles, earned out in the mixing device ensures that said abrasive material in suspension has the exact concentration of abrasive particles desired, guaranteeing constant quality and repeatability of the cutting operations.
  • the method also comprises the following steps:
  • the step of preparing the abrasive material in suspension comprises the mixing of water, at least one gelling agent, said wet or dry abrasive particles, or both wet and dry abrasive particles.
  • the reference number 1 indicates as a whole an apparatus for water jet cutting.
  • water must be interpreted extensively, hence with reference to any liquid and, even more generally, fluid, solid or combinations thereof, provided that it is suitable to be treated (compressed, transferred, conveyed) with the normal devices used for a fluid and in particular suitable to be forced inside an orifice of small size, such as the focusing nozzle of the apparatus.
  • the apparatus is then supplied with a water source 2 to supply the aforesaid process water to the apparatus.
  • the water source 2 can comprise a tank or a continuous feed line.
  • the source 2 can be equipped with water treatment devices to treat the process water to make it more suitable for use in high pressure pumping apparatus. These treatment devices are well known to those skilled in the art and shall not be described in more detail.
  • a water line 3 connects the water source 2 to pumping means 4.
  • Said pumping means 4 can comprise a common waterjet pump, for example an intensifier pump, a reciprocating pump, a direct-drive pump or a servo-electric pump.
  • Said pumping means are generally configured to convey the process water at a pressure typically between 3000 and 6000 bar.
  • a water infeed line 5 places said pumping means 4 in communication with the cutting head 10 of the apparatus.
  • the apparatus 1 further comprises a source, indicated as a whole with 20, of an abrasive material in suspension 21.
  • the source of abrasive material in suspension 20 (hereinafter also only “abrasive material”), comprises a tank 22 in which the abrasive material in suspension 21 can be deposited.
  • An abrasive inlet channel 23 places the tank 22 in communication with the cutting head 10.
  • said abrasive material in suspension comprises a liquid or, preferably, gelatinous substance in which particles of abrasive material are dispersed.
  • abrasive materials that can be used in the apparatus of the invention are garnet, glass, metal grits based on aluminum or the like.
  • a gelatinous substance is particularly advantageous as it allows the abrasive particles to remain suspended, and hence dispersed homogeneously, for several hours, preventing them from precipitating through gravity and accumulating at the bottom, mainly, of the tank 22.
  • the abrasive material in suspension can therefore be prepared and stored in a tank of the apparatus ready for use.
  • the suspension is formed with a water-based gelatinous substance.
  • the suspension comprises water and a gelling agent.
  • the volume ratio between the amount of abrasive material and of the liquid or gelatinous substance is preferably from 1 :4 to 1 :8 and more preferably from 1 :5 to 1 :7.
  • the cutting head 10 comprises a body 1 1 in which a mixing chamber 12 is provided.
  • the mixing chamber 12 is in fluid communication with the water infeed line 5 and with the abrasive inlet channel 23.
  • the pressurized water is forced into an orifice 13 from which it flows, at a very high speed, into the mixing chamber 12.
  • the high speed generates a vacuum pressure in the mixing chamber 12, which in turn draws the abrasive material in suspension 21 from the tank 22 through the abrasive inlet channel 23.
  • the abrasive material in suspension 21 and the water jet are then mixed in the mixing chamber 12 and, subsequently, conveyed into the focusing tube 14 from which a jet 15 of water and abrasive material is delivered.
  • a suitable cutting head is, for example, the model Dialine manufactured and marketed by Hyperterm Inc. or the model Slice Two manufactured and marketed by Diamond Technology Innovations.
  • this nozzle is equipped with a focusing tube of the jet with a length preferably between 100 mm and 200 mm and more preferably between 140 mm and 160 mm.
  • the nozzle thus configured creates a jet of water and abrasive material capable of remaining cohesive for a greater distance relative to that of a conventional AWJ system, allowing a greater depth of this jet with the same material processed.
  • said focusing tube comprises two portions of tube joined together by a removable connection means (not illustrated).
  • a removable connection means not illustrated.
  • Suitable focusing tubes are, for example, the models Roctec 100 or Roctec 500, manufactured and marketed by Kennametal Inc.
  • the apparatus is equipped with flow regulating means 27.
  • Said flow regulating means 27 preferably comprise a moving partition positioned on the abrasive inlet channel 23 or, preferably, directly on the abrasive outlet on the tank 22.
  • the moving partition by widening or narrowing the section of the opening for the flow of abrasive material to pass through, regulates the flow of this material conveyed toward the mixing chamber as a result of the vacuum pressure.
  • the moving partition can be moved either manually or by means of an electric or pneumatic actuator associated therewith.
  • the apparatus is equipped with a mixing device
  • said mixing device 24 provided with agitator means to mix the abrasive particles and the liquid or gelatinous substance to form the abrasive material in suspension 21 .
  • said mixing device 24 is in communication with the tank 22.
  • a pump 25, if provided, can directly feed the abrasive material in suspension into said tank.
  • the apparatus comprises dosing means 26 associated with said mixing device 24 to dose at least the water, the gelling agent and, optionally, the particles of abrasive material to form the abrasive material in suspension.
  • the gelatinous substance is prepared by mixing water and the gelling agent, this latter being between 0.05 % and 5% of the volume of the water used, and more preferably around 3%.
  • the apparatus is equipped with a recovery and recycling system of the abrasive material, indicated as a whole with the reference number 30.
  • this recycling system comprises a recovery device 32 configured to receive a wet mass of abrasive particles and of waste material from a collection container 3 1 , positioned in an area below the nozzle.
  • the process water and the abrasive material of the jet 15, as well as the waste material from processing, are collected in this container 3 1.
  • a suitable recovery device is, for example, described in US 62995 10 B l .
  • the recycling system 30 also comprises separation means 33, adapted to separate the wet mass of reusable abrasive particles from the wet mass of non-reusable abrasive particles and from the waste material.
  • these separation means 33 are configured to separate particles with a size greater than a given value, comprising processing waste from the workpiece, and particles with a size below a given threshold, comprising both processing waste and crushed particles of abrasive. These products are conveyed into a waste container 36 to be disposed of correctly.
  • the separation means 33 comprise a cyclone device 34, if necessary associated with a filter device 35.
  • the wet mass of reusable abrasive particles can then be stored in a collection tank 37 or, preferably, conveyed toward the source of the abrasive material in suspension 20, for example by means of an auger or equivalent pumping means.
  • this wet mass of reusable abrasive particles can be conveyed directly into the mixing device 24 for the production of other abrasive material in suspension to be used in the machining process.
  • further dosing means are preferably provided to control the amount of recycled abrasive material introduced into the mixing device 24.
  • the apparatus guarantees that the abrasive material in suspension prepared has the correct percentage of dispersed abrasive particles. Moreover, with this system it is also possible, if necessary, to introduce new dry abrasive particles into the mixer and to dose their amount relative to the amount of recovered wet particles.
  • the recycling system is particularly advantageous from the point of view of operating costs, making recovery and recycling profitable also for users of apparatus for water jet cutting.
  • Said recovery operations of the abrasive material can be implemented continuously during operation of the cutting apparatus. If the amount of abrasive particles recovered is not sufficient to guarantee the correct flow of abrasive material in suspension, new dry particles can be mixed with the recovered wet particles, the water and the gelling agent.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

La présente invention concerne un appareil de découpe à jet d'eau comprenant : une source d'eau (2); - des moyens de pompage (4), en communication avec la source d'eau, pour générer un écoulement d'eau à haute pression; un réservoir (22) contenant un matériau abrasif en suspension (21), dans lequel ledit matériau abrasif en suspension comprend un fluide et des particules abrasives dispersées de manière homogène dans ledit fluide; et - une tête de coupe (10) en communication fluidique avec lesdits moyens de pompage (4) et ledit réservoir (22) du matériau abrasif en suspension (21), ladite tête de coupe comprenant une chambre de mélange (12); ledit réservoir du matériau abrasif en suspension (21) étant en communication avec ladite tête de coupe (10) au moyen d'un canal d'entrée abrasif (23) et ladite tête de coupe étant configurée pour générer une pression de vide qui tire le matériau abrasif en suspension (21) à travers ledit canal d'entrée d'abrasif (23) vers la chambre de mélange (12) pour mélanger le matériau abrasif en suspension et l'eau à haute pression et former un jet d'eau et d'abrasif (15). La présente invention concerne en outre un procédé de génération d'une découpe à jet d'eau pouvant être mis en œuvre avec ledit appareil.
EP17788309.7A 2016-09-28 2017-09-28 Appareil et procédé de découpe à jet d'eau Withdrawn EP3519133A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102016000097457A IT201600097457A1 (it) 2016-09-28 2016-09-28 Apparato per il taglio a getto d’acqua
PCT/IB2017/055964 WO2018060920A1 (fr) 2016-09-28 2017-09-28 Appareil et procédé de découpe à jet d'eau

Publications (1)

Publication Number Publication Date
EP3519133A1 true EP3519133A1 (fr) 2019-08-07

Family

ID=57909987

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17788309.7A Withdrawn EP3519133A1 (fr) 2016-09-28 2017-09-28 Appareil et procédé de découpe à jet d'eau

Country Status (4)

Country Link
US (1) US20190210188A1 (fr)
EP (1) EP3519133A1 (fr)
IT (1) IT201600097457A1 (fr)
WO (1) WO2018060920A1 (fr)

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CN108608338B (zh) * 2018-05-23 2019-11-26 武汉大学 一种前混磨料射流发生装置
EP3632618B1 (fr) * 2018-10-04 2021-03-10 Politecnico di Milano Machine et procédé de découpe à jet d'eau abrasif, et composition comprenant des particules abrasives
CN110370172B (zh) * 2019-05-29 2020-10-30 中国矿业大学 一种前混合磨料水射流的磨料回收循环系统及其使用方法
IT202000006010A1 (it) * 2020-03-20 2021-09-20 Milano Politecnico Macchina da taglio a getto d’acqua abrasivo
CN112571287B (zh) * 2020-12-11 2022-08-02 浙江大学 一种切割钢筋混凝土板的超高压水刀射流装置及其使用方法
US20230136030A1 (en) * 2021-11-02 2023-05-04 Flow International Corporation Abrasive fluid jet with recycling system for abrasives and methods of use of same
US20230251168A1 (en) * 2022-02-08 2023-08-10 Materials and Machines Corporation of America Biological sample collection and dispensing system
CN114750075B (zh) * 2022-04-08 2023-08-18 中铁第四勘察设计院集团有限公司 一种高压磨料水射流钢轨打磨水品质检测循环系统及方法
DE102022113088B3 (de) 2022-05-24 2023-11-09 Maximator JET GmbH Wasser-Abrasiv-Injektorstrahlschneidvorrichtung, Wasserstrahlschneidsystem und Verfahren zum Trennschneiden
US20240139910A1 (en) * 2022-10-27 2024-05-02 Flow International Corporation Systems and apparatus for use of wet recycled abrasive and methods of operation of said systems and apparatus

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Also Published As

Publication number Publication date
US20190210188A1 (en) 2019-07-11
WO2018060920A1 (fr) 2018-04-05
IT201600097457A1 (it) 2018-03-28

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