JPH02237799A - Injection liquid for fluid jetting device - Google Patents

Abstract

PURPOSE:To reduce the piping friction resistance of an injection liquid by using a water solution having an ionic monomer unit of 2-50mol% and acrylamid monomer unit of >=50mol% and in which the acrylamid copolymer whose proper viscosity in one specified brine is >=10dl/g is melted at 0.02-0.2wt.%. CONSTITUTION:An ultrahigh pressure jet pump is driven and a high pressure fluid is fed to a jet nozzle 3 via a fluid pipe 8. The works of cutting, grinding, punching, etc., are executed on the body 10 to be worked placed on a transfer base 5 by the injection liquid jetted from this nozzle 3. In this case, this injection liquid is composed of the water solution having an ionic monomer unit of 2-50mol% acrylamid monomer unit of >=50mol% and in which the acrylamid copolymer whose proper viscosity in one specified brine is >=10dl/g is melted at 0.02-0.2wt.%. Consequently, the time lapse deterioration of the injection liquid can be improved and the piping friction resistance of the injection liquid can be reduced as well.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention sprays ultra-high pressure fluid from a nozzle, and sprays buildings, structures, building materials, plates, concrete, processed objects, etc. that face the sprayed fluid. The present invention relates to an injection liquid for a fluid jet processing device that is applied to perform processing such as cutting, drilling, and grinding on an object.

[Conventional technology]

Conventionally, the Water Jets I-I jets ultra-high pressure water from a nozzle and performs processing such as cutting, drilling, and grinding on objects such as buildings, structures, building materials, plates, concrete, and processed objects that face the jetted liquid. A fluid jet processing apparatus is disclosed. Such a fluid dienoto processing device injects ultra-high pressure water of 500 to 3,000 kgf/1 from a nozzle to grind various objects, that is, solids, and generates an impact force on the solid in the form of a jet stream. A method of processing this solid is known. For example, Japanese Patent Publication No. 56-42413 discloses that a liquid such as water, chemical liquid, or grinding liquid is injected from an injection nozzle as a thin line-shaped jet stream, and the dienoto stream is made to collide with the workpiece facing the object. A geso 1 processing device for processing a workpiece by drilling, cutting, clipping, etc. is disclosed.

Further, Japanese Patent Application Laid-Open No. 16999/1983 discloses an abrasive water jet cutting device. This abrasive water gesotho cutting device places the material to be cut between the jeso nozzle and the cassochar, and then supplies ultra-high pressure water to the geso nozzle via the high pressure water supply hose, and grinds fine particles. A suspension containing the material is supplied to a jet nozzle through a suspension supply hose, and a meter jet containing fine abrasive material is ejected from the jet nozzle, and the material to be cut is cut by the jet. It is something to do. ``The fine abrasive material mentioned in item 2 is alumina-based fine powder. Silicon carbide-based fine powder is used, and the concentration of the suspension is adjusted to 20 to 70%.

[The secret problem that the invention attempts to solve]

However, in the above-mentioned fluid JEF 1 processing device, which is usually called a Uzuta jet, the injection pattern of the jet flow itself is in a diffused state, and when it collides with the workpiece, the collision force is reduced. Grinding ability becomes weak. Furthermore, when a highly viscous liquid is drawn into the pump, there is a problem in that the pump frequently malfunctions due to overload. Furthermore, there is not necessarily a correlation between the viscosity of the injection liquid and the effectiveness of the water jet. The purpose of this invention is to solve the above problems, and as a result of various studies on the injection pattern of the Gesotho flow itself by adding water-soluble polymers to the injection liquid used in fluid jet processing equipment, it was found that all water-soluble polymers However, we found that an acrylic ionic water-soluble polymer with a special range of physical properties was the most effective material that could maintain the convergence of the injection pattern of the jet stream itself. Injection for fluid jet processing equipment that injects an aqueous solution of acrylic ionic water-soluble polymer from a jet nozzle using a bomb, increasing the processing efficiency of the fluid jet injected from the jet nozzle without placing a high load on the pump. It is to provide liquid.

[Means to solve the problem]

In order to achieve the above object, the present invention is configured as follows. That is, the present invention provides an acrylamide copolymer having 2 to 50 mol% of ionic monomer units and 50 mol% or more of acrylamide monomer units and having an intrinsic viscosity of 10 dl/g or more in 1N saline.
. The present invention relates to an injection liquid for fluid jet processing equipment I, characterized in that it consists of an aqueous solution in which 0.02 to 0.2% by weight is dissolved.

That is, the water-soluble polymer suitable as the injection liquid for the fluid jet 1 and processing equipment according to the present invention has (1) an intrinsic viscosity in normal saline of IOJ/g or more, and an ionization rate of 2 to 2.
It is an acrylic ionic water-soluble polymer containing 50 mol% or more of acrylamide monomer units, and is an acrylamide copolymer containing 50 mol% or more of acrylamide monomer units. This water-soluble polymer may also contain copolymerized nonionic monomer units other than acrylamide in an amount that does not adversely affect the effect (usually 20 mol% or less). In addition, the ionic monomers used in the injection liquid polymer for fluid jet processing equipment according to the present invention include acrylate, acrylamide 2-methylpropanesulfonate, dialkylaminoalkyl (meth)acrylamide,
or its quaternized product, dialkylaminoalkyl (meth)
Examples include acrylate or its quaternized products, and an acrylic ionic water-soluble polymer can be obtained by selecting one or more of them and copolymerizing them with acrylamide. Examples of nonionic monomers that can be copolymerized with acrylamide and ionic monomers include diacetone acrylamide, hydroxyethyl (meth)acrylate, acrylonitrile, and styrene. In addition, polyacrylamide partial hydrolysates, polyacrylamide sulfomethylates, polyacrylamide Mannich compounds, etc., which have the same molecular structure as these acrylamide copolymers, can also be used for the same purpose.

These acrylic ionic water-soluble polymers are commercially available in the form of solid powders, aqueous paste solutions, water-in-oil emulsions, dispersions in aqueous salt solutions, and the like. In particular, regarding acrylic ionic water-soluble polymers, Emulgin and Disvergitan, in which polymer particles with a particle size of 100 μm or less are dispersed in a liquid, have a fast dissolution rate, so they can be supplied while being dissolved continuously. This is the most desirable form. This acrylic ionic water-soluble polymer is sucked into a pump as an aqueous solution with a concentration of 0.02 to 0.2% by weight, and is injected from a jet nozzle. The fluid jet machining device using a jet liquid according to the present invention can process arbitrary objects made of various materials such as rocks, metals, non-metals, wood, building materials, resins, plastics, etc., or composites thereof. For example, it can be applied to buildings, structures, building materials, plates, concrete bodies, processed objects, etc. Moreover, a workpiece grinding surface protectant such as a rust preventive agent may be added to the sprayed liquid as required.

[Effect]

The fluid dienol/injection liquid for processing equipment according to the present invention is constructed as described above and functions as follows. That is, the purpose of this injection liquid for a fluid die-solith processing apparatus is to increase the grinding efficiency by injecting an aqueous polymer solution instead of water during grinding using a fluid jet.

In other words, when ultra-high pressure water, which is conventionally used in water jets, is injected from the tip of the jet nozzle to the workpiece, the water jet stream is injected in a convergent state up to a certain distance, but it is injected at a distance a little further away. When reaching , the spray pattern is sprayed in a mist-like, diffused state;
Using a jet fluid according to the invention, a fluid jet stream can maintain a convergent spray pattern over a long distance and impinge on a workpiece in that convergent state, i.e., in a state where the energy of the jet stream is concentrated. Therefore, the impact force of the fluid jet against the object to be processed can be dramatically increased.

It is believed that the convergent jet flow formed by the injected fluid of the present invention, which extends over a sufficient distance, is due to the structural viscosity exhibited by non-Newtonian flow.

In other words, Karman vortices, which are generated by contact between a stationary object and a moving fluid, are also generated in a jet stream injected at ultra-high pressure due to friction with the stationary atmosphere, and diffuse the jet stream. It is presumed that the polymer prevents the generation of the Karman vortices, thereby providing a focused jet stream.

The injection liquid according to the present invention has an intrinsic viscosity of 17 g or more in 1N saline and an ionization rate of 2 to 2.
For example, an acrylamide copolymer with a concentration of 50 mol % can be mentioned, and the long polymer chains produced due to the high degree of polymerization are elongated due to mutual repulsion between ions within the polymer, and exhibit structural viscosity.

〔Example〕

Examples of the injection liquid for a fluid jet processing apparatus according to the present invention will be described below.

FIG. 1 shows an example of a fluid jet machining apparatus using a jet liquid according to the present invention. In this fluid jet processing device, a nozzle moving device 2 arranged on a machine stand 1 includes a carriage 9 that can move horizontally on the machine stand 1, and a carriage 9 that can be moved horizontally on the machine stand 1.
It has a support stand 6 that is movable in the vertical direction on the top of the support stand 6.
A nozzle holder 7 is attached to the. A jet nozzle 3 is removably attached to this nozzle holder 7. Further, a fluid pipe 8 is connected to the nozzle holder 7 in order to supply the jet nozzle 3 with high-pressure fluid sent from an ultra-high-pressure jet pump. Movement control of the reciprocating table 9 and the support stand 6 in the 'a-body jet processing apparatus is performed by commands from a controller (not shown) of the nozzle movement operation panel 4. The fluid jet ejected from the jet nozzle 3 is applied to the workpiece I installed on the conveyor table 5.
O, for example, is injected onto an object such as plastic, gypsum board, plywood, etc., and the workpiece 10 is subjected to processing such as cutting, grinding, and drilling.

Example 1 A workpiece 10 made of an aluminum alloy plate having a thickness of 5I and having a compressive strength of 2600 kgf/1 and a hardness was placed on a conveyance table 5 of a fluid jet processing apparatus shown in FIG. The nozzle hole diameter of the jet nozzle 3 is 0.5-11 m, and the distance between the jet nozzle 3 and the aluminum alloy plate is 50 m. The neutralized aqueous solution of the polymer listed in Table 1 was pumped with an ultra-high pressure pump for 2 hours.
Table 2 shows the results of measuring the penetration time and W hole diameter by pressurizing to 000 kgf/1 and injecting from the jet nozzle 3. The viscosity of the injection liquid was measured using a viscometer [Tokyo Keiki ■ model B-8M viscometer No. 1 rotor 60 rpm at a temperature of 25°C.
) was measured. Table-1 [η] = Intrinsic viscosity in 1 normal saline Table-2 However, the meanings of the abbreviations in the table are as follows.

AAM - Acrylamide: AMPS = - Acrylamide 2-methylpropanesulfonic acid AAC - Acrylic acid DAAM - Diacetone Acryl 7mide Example 2 Each liquid listed in Table 3 was sprayed in the same manner as in Example 1, and the thickness was length 5m
A penetration test was conducted on a mild steel plate, and the penetration time was measured. The results are shown in Table 3.

(Hereinafter, the margins of this page) Table 3 [Effects of the Invention] The injection liquid for placing a T bag with a strange body jet according to the present invention is configured as described above, and has the following effects.

That is, this fluid dieno I/injection liquid for processing equipment has 2 to 5
An acrylamide copolymer having an ionic monomer unit of 0 mol% and an acrylamide monomer scale of 50 mol% or more and having an intrinsic viscosity of 1QdI/g or more in 1N saline is 0.02 to 0.2 Since it is composed of an aqueous solution dissolved in weight%, it is possible to improve the aging deterioration of the injection liquid itself, and
When the injected liquid is injected from the nozzle via the injection pump, the pipe friction resistance of the injected liquid can of course be reduced, and the fluid flow injected from the nozzle can be ejected in a convergent state over a long distance. The pattern can be maintained, and the converged jet pattern can create a state in which it collides with the workpiece. Therefore, the impact force of the fluid on the workpiece is increased rapidly by colliding with the fluid in a concentrated state without the energy of the flow dispersing, and the impact force on the workpiece is increased rapidly. With regard to machining such as cutting, drilling, and grinding, the machining speed can be increased to a high speed to improve work efficiency, and the machining accuracy for broken workpieces can be improved. In addition, it is possible to prevent the liquid sprayed from the nozzle from scattering into the air during spraying, and it is extremely easy to handle during work.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an example of a fluid jet 1/processing device that can use the fluid jet 1/processing device injection liquid according to the present invention. Machine stand, nozzle moving device, dinit nozzle, 1 support stand, 10 workpiece snout.

Claims (1)

[Claims] 0.02 to 0.2 weight of an acrylamide copolymer having 2 to 50 mol% of ionic monomer units and 50 mol% or more of acrylamide monomer units and having an intrinsic viscosity of 10 dl/g or more in 1N saline. An injection liquid for fluid jet processing equipment, characterized in that it consists of an aqueous solution in which % is dissolved.