JPH0669677B2 - Injection liquid for fluid jet processing equipment - Google Patents

Description

The present invention relates to an object such as a building, a structure, a building material, a plate material, concrete, or a processed product that ejects an ultrahigh pressure fluid from a nozzle and faces the ejected fluid. The present invention relates to a jet liquid for a fluid jet processing device, which is applied to perform processing such as cutting, punching and grinding.

[Prior Art] Conventionally, processing such as cutting, perforating, grinding, etc. of an object such as a building, a structure, a building material, a plate material, concrete, or a processed object which jets ultra-high pressure water from a nozzle and faces the jetted liquid There is disclosed a fluid jet processing device called a water jet for performing the above. Such a fluid jet machining device is used to grind various objects or solids from a jet nozzle.
A method is known in which ultra-high pressure water of 500 to 3000 kgf / cm ² is jetted and the solid is processed by the impact force of the jet stream on the solid.

For example, in Japanese Examined Patent Publication No. 56-42413, a liquid such as water, a chemical liquid, and a grinding liquid is jetted as a fine cotton jet stream from an jet nozzle, and the jet stream is made to collide with a workpiece facing the jet stream. There is disclosed a jet processing apparatus that performs processing such as punching, cutting, and cutting a work piece.

Further, Japanese Patent Laid-Open No. 63-16999 discloses an abrasive water jet cutting device. The abrasive water jet cutting device has a material to be cut placed between a jet nozzle and a catcher, and then supplies ultra-high pressure water to the jet nozzle via a high-pressure water supply hose and contains a fine-grain abrasive. The suspension is supplied to a jet nozzle via a suspension supply hose, a water jet mixed with a fine abrasive is jetted from the jet nozzle, and the material to be cut is cut by the jet. Alumina-based fine particles and silicon carbide-based fine particles are used as the fine abrasives, and the temperature of the suspension is adjusted to 20 to 70%.

[Problems to be Solved by the Invention]

However, in the above-mentioned fluid jet machining apparatus usually called a water jet, the jet pattern of the jet flow itself is in a diffused state, and when colliding with the workpiece, the collision force decreases and the grinding ability is reduced. Will be weak. Further, when the high-viscosity liquid is sucked into the pump, there is a problem that the pump is frequently damaged due to overload. Further, there is no correlation between the viscosity of the jet liquid and the effect of the water jet.

An object of the present invention is to solve the above-mentioned problems. As a result of various investigations on the jet pattern of the jet flow itself by adding a water-soluble polymer to the jet liquid used in the fluid jet processing apparatus, all the water-soluble polymers It is not possible to solve the above problems, but it was found that it is the optimum one that can maintain the converged state of the injection pattern of the acrylic ionic water-soluble polymer jet flow itself having a special physical property range,
For a fluid jet processing device capable of increasing the processing efficiency of a fluid jet ejected from a jet nozzle without injecting a high load on the pump by ejecting an aqueous solution of the acrylic ionic water-soluble polymer from a jet nozzle by a pump To provide a jetting liquid.

[Means for Solving the Problems]

The present invention is configured as follows to achieve the above object. That is, the present invention has 2 to 50 mol% of ionic monomer units and 50 mol% or more of acrylamide monomer units, and has an intrinsic viscosity in 1N saline.
0.02 to 0.2% of acrylamide copolymer with 10 dl / g or more
The present invention relates to an injection liquid for a fluid jet processing device, which is composed of an aqueous solution in which the content is wt%.

That is, a water-soluble polymer suitable as a jet liquid for a fluid jet processing apparatus according to the present invention has an acrylic viscosity of 1 to 50 mol% and an intrinsic viscosity of 10 dl / g or more in 1N saline. It is an aqueous polymer and is an acrylamide copolymer having 50 mol% or more of acrylamide monomer units. The water-soluble polymer can also have a nonionic monomer unit other than acrylamide by copolymerization in an amount in a range that does not adversely affect the effect (usually 20 mol% or less).

Further, as the ionic monomer used in the polymer for the jet liquid for the fluid jet processing apparatus according to the present invention, acrylate, acrylamido-2-methylpropanesulfonate, dialkylaminoalkyl (meth) acrylamide, or a quaternary product thereof , Dialkylaminoalkyl (meth) acrylate, or a quaternary compound thereof, etc., and an acrylic ionic water-soluble polymer can be obtained by selecting a single type or a plurality of types and copolymerizing with acrylamide.

Examples of nonionic monomers that can be copolymerized with acrylamide and ionic monomers include diacetone acrylamide, hydroxyethyl (meth) acrylate, acrylonitrile, and styrene. Also,
A polyacrylamide partial hydrolyzate, a polyacrylamide sulfomethylated product, a polyacrylamide Mannich product, and the like having the same molecular structure as these acrylamide copolymers can also be used for the same purpose.

These acrylic ionic water-soluble polymers are distributed and marketed in the form of powdery solid, paste-like aqueous solution, water-in-oil emulsion, dispersion in salt aqueous solution and the like. In particular, regarding acrylic ionic water-soluble polymers, emulsions and dispersions in which polymer particles with a particle size of 100 μm or less are dispersed in a liquid have a high dissolution rate, so it is possible to supply them while continuously dissolving them. This is the preferred form. This acrylic ionic aqueous solution polymer is sucked by a pump as an aqueous solution having a concentration of 0.02 to 0.2% by weight and jetted from a jet nozzle. A fluid jet processing apparatus using an injection liquid according to the present invention is an object to be processed, which is an arbitrary object made of various substances such as rock, metal, nonmetal, wood, building material, resin, plastic, etc. For example, it can be applied to buildings, structures, building materials, plate materials, concrete bodies, processed products, and the like. If desired, a rust preventive agent or other protective agent for the ground surface of the workpiece can be added to the jet liquid.

[Action]

The jet liquid for a fluid jet processing device according to the present invention is configured as described above and operates as follows. That is,
This jetting liquid for a fluid jet processing device is to increase the grinding efficiency by jetting a polymer aqueous solution instead of water in the grinding process by a fluid jet. That is, when the ultra-high pressure water conventionally applied to water jet is jetted from the tip of the jet nozzle to the workpiece, the water jet flow is jetted in a converged state up to a certain distance, but at a slightly distant distance. In contrast, while the jet pattern is jetted in a mist-like diffused state, the use of the jet liquid according to the present invention makes it possible to maintain the jet pattern in which the fluid jet stream is converged over a long distance. It can collide with the work piece in a converged state, that is, in a state where the energy of the jet stream is concentrated. Therefore, the impact force of the fluid jet on the object to be processed can be dramatically increased.

It is considered that the convergent jet flow formed by the jet liquid according to the present invention and extending to a sufficient distance is due to the structural viscosity exhibited by the non-Newtonian flow. That is, the Karman vortex, which is generated by the contact between the stationary object and the moving fluid, is also generated in the jet flow injected at the ultrahigh pressure due to the friction with the stationary atmosphere, and the jet flow is diffused. It is speculated that the ionic polymer gives a convergent jet flow by preventing the generation of the Karman vortex.

The jet liquid according to the present invention has, as a water-soluble polymer exhibiting the above-mentioned structural viscosity, an intrinsic viscosity in 1N saline of 10 dl / g or more and an ionization rate of 2 to 50 mol%.
The acrylamide copolymer can be mentioned, and a long polymer chain produced by a high degree of polymerization is extended by repulsion of ions in the polymer and exhibits structural viscosity.

〔Example〕

Embodiments of the jet 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 processing apparatus using the jet liquid according to the present invention. In this fluid jet processing apparatus, the nozzle moving device 2 arranged on the machine base 1 is provided with a carriage 9 that can move horizontally on the machine base 1 and the carriage 9
Has a support base 6 that can move up and down in the vertical direction.
A nozzle holder 7 is attached to the. The jet nozzle 3 is detachably attached to the nozzle holder 7. Further, a fluid pipe 8 is connected to the nozzle holder 7 in order to supply the high pressure fluid sent from the ultra high pressure jet pump to the jet nozzle 3. The movement control of the carriage 9 and the support 6 in the fluid jet processing apparatus is performed by a command from a controller (not shown) of the nozzle movement operation panel 4. The fluid jet ejected from the jet nozzle 3 is ejected to an object 10, such as a plastic, a gypsum board, or a plywood, which is installed on the carrier 5, and cuts or grinds the object 10. Processing such as perforation is performed.

Example-1 A workpiece 10 made of an aluminum alloy plate having a thickness of 5 mm and having a hardness of compressive strength of 2600 kgf / cm ^{2 was} placed on a carrier table 5 of the fluid jet processing apparatus shown in FIG. The nozzle hole diameter of the jet nozzle 3 is 0.5 mm, and the distance between the jet nozzle 3 and the aluminum alloy plate is 50 mm. Table 2 shows the results of measuring the penetration time and the diameter of the through hole by pressurizing the aqueous solution of the neutralized polymer of Table 1 to 2000 kgf / cm ² by an ultrahigh pressure pump and injecting it from the jet nozzle 3. The viscosity of the jetted liquid was measured at a temperature of 25 ° C. under a viscometer [B-8M type viscometer manufactured by Tokyo Keiki Co., Ltd.
No. rotor 60 rpm].

Example-2 Each liquid described in Table-3 was sprayed in the same manner as in Example-1, and the thickness was 5 mm.
Table 3 shows the results of measuring the penetration time by performing a penetration test on the mild steel sheet.

[Effects of the Invention] The jet liquid for a fluid jet processing device according to the present invention is configured as described above and has the following effects. That is, the jet liquid for a fluid jet processing device has 2 to 50 mol% of ionic monomer units and 50 mol% or more of acrylamide monomer units, and has an intrinsic viscosity of 10 dl / g or more in 1N saline. 0.02 copolymer
Since it consists of an aqueous solution of ~ 0.2 wt% dissolved, it is possible not only to improve the deterioration of the jetting liquid itself with time but also to reduce the pipe frictional resistance of the jetting liquid when the jetting liquid is jetted from the jet pump through the pipe through the nozzle. Therefore, the jet pattern of the fluid jet jetted from the nozzle can maintain a jet pattern in a converged state over a long distance, and a state of colliding with the workpiece can be created by the converged jet pattern. Therefore, the impact force of the fluid jet on the object of the work piece can be dramatically increased by colliding in a concentrated state without the energy of the jet flow being diffused, and the impact force on the work piece can be cut. With respect to machining such as drilling, grinding, etc., the working speed can be improved to a high speed to improve work efficiency, and further, the working accuracy for the workpiece can be improved. Further, it is possible to prevent the jetted liquid jetted from the nozzle from scattering into the air during jetting, and the handling is extremely easy in the work.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of a fluid jet processing apparatus capable of using a jet liquid for a fluid jet processing apparatus according to the present invention. 1 ... Machine stand, 2 ... Nozzle moving device, 3 ... Jet nozzle, 6 ... Support stand, 10 ... Workpiece.

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Yuichi Sugiyama, Inventor Yuichi Sugiyama, Adachi-ku, Tokyo 1-10-5 (56) References JP-A-51-31986 (JP, A)

Claims (1)

[Claims] 1. A ionic monomer unit of 2 to 50 mol% and 50
For a fluid jet processing device, characterized by comprising an aqueous solution in which 0.02 to 0.2% by weight of an acrylamide copolymer having an acrylamide monomer unit of not less than mol% and an intrinsic viscosity in 1N saline of not less than 10 dl / g is dissolved. Injection liquid.