JPH0580269B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a high-pressure fluid injection nozzle for injecting high-pressure fluid at an ultra-high speed jet.

(Conventional technology) Sand,
There is a cutting system that performs cutting, cutting, drilling, etc. by jetting ultra-high pressure jet water mixed with abrasives such as grit and metal particles at an ultra-high speed. The conventional structure of the nozzle portion of this cutting system is shown in FIGS. 5 and 6.

In FIG. 5, one end of a nozzle holder 2 is fixed to the tip of an ultra-high pressure water conduit 1 by screwing, and a water nozzle 3 is disposed at the tip of the ultra-high pressure water conduit 1. Then, the ultra-high pressure water flowing through the ultra-high pressure water conduit 1a of the ultra-high pressure water conduit 1 passes through the ultra-high pressure water injection hole 3a of the water nozzle 3 and enters the abrasive suction chamber 2a provided in the nozzle holder 2 as an ultra-high-speed jet. It is sprayed out. Further, one end of an abrasive supply pipe 4 is opened in this abrasive suction chamber 2a, and abrasive is sucked and mixed through an abrasive introducing hole 4a by an ultra-high-speed jet. Further, a nozzle fixing cap 5 is screwed onto the other end of the nozzle holder 2, and a collar 6a of the nozzle fixing cap 5 is pressed against the other end of the nozzle holder 2, thereby forming an abrasive-containing injection nozzle 6 which is a high-pressure fluid injection nozzle. is fixed. Then, an ultrahigh-speed jet mixed with abrasive is injected onto the workpiece through an abrasive-containing injection hole 6b formed in the abrasive-containing injection nozzle 6.

The one shown in FIG. 6 is different in the shape of the abrasive-containing injection nozzle 16 from that shown in FIG. Nozzle fixing cap 1
5, it is pressed and fixed to the other end side of the nozzle holder 2. In FIG. 6, reference numeral 16b indicates an abrasive injection hole.

Here, the speed of the ultra-high-speed jet to be injected, the moving speed of the abrasive-containing injection nozzles 6 and 16 relative to the workpiece, the hardness of the abrasive to be mixed, and the diameters of the abrasive-containing injection holes 6b and 16b are constant. If so, the diameter d and the length l of the abrasive injection holes 6b, 16b.
The cutting depth h has a tendency as shown in FIG. 7 with respect to the ratio l/d. That is, in a range where l/d is small, the cutting depth h becomes deeper as l/d increases, and when l/d is 20 to 30, the cutting depth h becomes maximum, and when l/d is further increased, The cutting depth h becomes shallower.

Therefore, for example, if the diameter d is 2 mm, the length l of the abrasive injection nozzles 6, 16 is preferably 40 to 60 mm.

(Problems to be Solved by the Invention) By the way, the above-mentioned abrasive-containing injection nozzle 6,
The inner walls of the 16 abrasive-mixed injection holes 6, 16b are significantly worn due to the flow of the ultra-high-speed jet mixed with the abrasive. This wear becomes more significant as the ultra-high velocity jet flows faster and the harder the abrasive is mixed. Therefore, the conventional abrasive injection nozzles 6 and 16 have the above-mentioned size and shape of 40 to 60 mm, and are made of a material such as cemented carbide or ceramic that has excellent wear resistance. However, for example, the abrasive-containing injection nozzle 6 made of tungsten carbide, which is a cemented carbide,
16, the inner walls of the abrasive-containing injection holes 6b, 16b will be worn out and the diameter of the holes will be enlarged after only a few minutes of use. For this reason, the diameter of the ultrahigh-speed jet that is injected increases, and cutting performance such as the cutting width and cutting depth of the workpiece is significantly reduced.
As a result, the abrasive-containing injection nozzles 6, 16 must be replaced frequently, which makes the work complicated, and the cost of parts for the abrasive-containing injection nozzles 6, 16 increases, resulting in high work costs. The dot was hot. Note that natural diamond or diamond powder sintered material is known as the material with the best wear resistance. However, only diamond powder sintered bodies with a diameter and thickness of about 10 mm are commercially available. For this purpose, an abrasive injection nozzle 6,1 with a length of 40 to 60 mm is used.
It is not realistic to form 6 with a diamond powder sintered body.

An object of the present invention was to solve the above-mentioned problems of the conventional high-pressure fluid injection nozzles, and to make the injection holes less likely to wear out and to make the maintenance of the injection holes economical and easy. An object of the present invention is to provide a high-pressure fluid injection nozzle that provides a high-pressure fluid injection nozzle.

(Means for Solving the Problems) In order to achieve the above object, the high-pressure fluid injection nozzle of the present invention has a protective member integrally fixed to the outer periphery of a diamond powder sintered body in which a through hole is formed. A cylindrical diamond piece is formed, a plurality of the diamond pieces are fitted and inserted into an array in an outer cylinder or a nozzle holder so that the through holes are coaxial, and are provided at the tip of the outer cylinder. The movement of the inserted and arranged diamond pieces in the injection direction is restricted by a small diameter part provided on the nozzle fixing cap screwed onto the tip of the nozzle holder, and the diamond pieces are formed by the arrangement of the plurality of through holes. The high-pressure fluid is configured to flow through the injection holes.

(Function) A plurality of diamond powder sintered bodies with through holes are arranged coaxially, and an injection hole of a predetermined length is formed by the plurality of coaxial through holes, so that each diamond powder sintered body is Regardless of the dimensions of the body, injection holes with any diameter-to-length ratio are formed.
Moreover, the diamond pieces, which are formed by integrally fixing the protective member to the outer periphery of the diamond powder sintered body, are fitted and inserted into the outer cylinder or nozzle holder, so they can be easily taken out and separated into individual diamond pieces. Easy to replace.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a longitudinal sectional view of the high-pressure fluid injection nozzle of the present invention, and FIG. 2 is an external perspective view of the diamond piece in FIG. 1.

1 and 2, a cylindrical diamond powder sintered body 20 is provided with a through hole 21 in the axial direction, and the outer periphery of this diamond powder sintered body 20 is made of metal, sintered alloy, ceramics, etc. A protective member 22 is provided to form a cylindrical diamond piece 23. A plurality of diamond pieces 23, 23... are fitted and inserted into an outer cylinder 24 made of metal, sintered alloy, etc. so that the through holes 21, 21 are coaxial with each other, thereby forming a high-pressure fluid injection nozzle. is formed. Note that a collar 24a is provided at one end of the outer cylinder 24, and a small diameter portion 24c is provided at the other end.
is provided, and diamond pieces 23, 23
... is restricted from moving in the injection direction. An opening 24b is provided in the small diameter portion 24c coaxially with the through hole 21, and the high pressure fluid injection nozzle of the present invention is fixed to the nozzle portion in the same manner as in FIG.

In this configuration, an ultrahigh-velocity jet mixed with an abrasive flows through an injection hole formed by a plurality of through holes 21, 21, . . . arranged coaxially. Here, the inner wall of the injection hole is made of diamond powder sintered body which has the highest wear resistance, is resistant to wear, and can withstand long-term use. As a result, work can be carried out efficiently and continuously for a long period of time, and work costs are reduced because there are fewer parts to be replaced.

And the diamond pieces 23, 23...
Since it is fitted and inserted into the outer cylinder 24, the outer cylinder 24
It is possible to easily take out the diamond piece 23 from the hole 21, and only the worn diamond piece 23 in the through hole 21 can be selected and replaced as appropriate. Furthermore, a diamond piece whose through hole 21 is worn out and enlarged can be used for a nozzle with a large diameter. In this way, only the worn parts of the through hole 21 are replaced, and the worn parts can be effectively used for a nozzle with a large diameter, and from this point of view as well, maintenance can be performed economically.

FIG. 3 is a longitudinal cross-sectional view of another embodiment of the high-pressure fluid injection nozzle of the present invention. In Figure 3, the first
Components that are the same as those in the figures and FIG. 2 are given the same reference numerals and redundant explanations will be omitted.

In the case shown in FIG. 3, distance pieces 25, 25 made of sintered metal, ceramics, etc. are interposed between a plurality of diamond pieces 23, 23, . has been done. In addition, these distance pieces 25, 2
5 is the through hole 2 of the diamond pieces 23, 23...
1, 21... and through holes 26, 26 having the same diameter as the outer diameter and the outer diameter.

In such a configuration, distance piece 2
The number of expensive diamond pieces 23 can be reduced compared to No. 5, and the entire high-pressure fluid injection nozzle can be constructed at low cost.

FIG. 4 is a longitudinal cross-sectional view of still another embodiment of the high-pressure fluid injection nozzle of the present invention, which is applied to the nozzle section of FIG. 6. In Figure 4, the second
Components that are the same as those in the figures and FIG. 6 are given the same reference numerals and redundant explanations will be omitted.

In FIG. 4, instead of the abrasive-containing injection nozzle 16 in FIG. 6, a plurality of diamond pieces 23, 23, . . . in FIG. The tip is fixed at a small diameter portion 15a provided at the tip of the nozzle fixing cap 15 so that movement in the injection direction is restricted. This small diameter portion 15a is provided with an opening 15b coaxially with the through hole 21.

In the above embodiment, the high-pressure fluid injection nozzle of the present invention is used as an abrasive-mixing injection nozzle that distributes an ultra-high-speed jet mixed with an abrasive, but the present invention is not limited to this. It goes without saying that the nozzle may also be used to spray ultra-high pressure fluid, high pressure fluid, etc. that are not mixed with abrasives.

(Effects of the Invention) As described above, according to the high-pressure fluid injection nozzle of the present invention, the injection hole is formed of diamond, which is a material with the best wear resistance, and the inner wall of the injection hole is less worn. For this reason, the diameter of the high-speed jet injected from the nozzle remains stable for a long time, reducing the frequency of nozzle replacement and improving work efficiency. Since the diamond piece is fitted and inserted, it can be easily taken out. Therefore, only the diamond piece whose through hole has worn out can be replaced as appropriate. moreover,
Diamond pieces with worn through holes can also be effectively used for larger diameter nozzles. In this way, the effort of replacing the nozzle is saved, parts can be used effectively, and maintenance is simple and economical, which is excellent in practical use.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of the high-pressure fluid injection nozzle of the present invention, FIG. 2 is an external perspective view of the diamond piece in FIG. 1, and FIG. 3 is a longitudinal sectional view of the high-pressure fluid injection nozzle of the present invention. FIG. 4 is a longitudinal sectional view of still another embodiment of the high pressure fluid injection nozzle of the present invention, and FIG. 5 is a longitudinal sectional view of still another embodiment of the high pressure fluid injection nozzle of the present invention. FIG. 6 is a longitudinal sectional view of the structure, FIG. 6 is a longitudinal sectional view of another conventional structure of the nozzle part of the cutting system, and FIG. It is a characteristic diagram of cutting depth with respect to 2: Nozzle holder, 15: Nozzle fixing cap, 15a: Small diameter portion, 15b: Opening, 20: Diamond powder sintered body, 21: Through hole, 22: Protective member, 23: Diamond piece, 24: Outer cylinder,
24b: Opening portion, 24c: Small diameter portion.

Claims (1)

[Claims] 1. A cylindrical diamond piece is formed by integrally fixing a protective member to the outer periphery of a diamond powder sintered body in which a through hole is bored, and the diamond piece is placed in an outer cylinder or a nozzle holder so that the through hole is coaxial with the protective member. A plurality of the nozzle fixing caps are fitted and arranged so as to be arranged in a vertical direction, and the insertion and arrangement are carried out by a small diameter part provided at the tip of the outer cylinder or a small diameter part provided on the nozzle fixing cap screwed into the tip of the nozzle holder. A high-pressure fluid injection nozzle, characterized in that the diamond piece is restricted from moving in the injection direction, and the high-pressure fluid is made to flow through the injection hole formed by the arrangement of the plurality of through holes.