JPH08267360A - Expanding method and device of working pattern in blasting work - Google Patents

Abstract

PURPOSE: To widen the width of a working pattern, making improvements in blasting work efficiency, and to uniformize the work depth of a blasting work surface as well as to improve the extent of quality in this blasting work surface. CONSTITUTION: An abradant in an abradant inductive chamber 12 is guide into a circumferential ring clearance part lying between a conical inner surface 16 and an air injection pipe 13, riding on an air flow of this air injection pipe 13, and it is sprayed as being conically diffused to the outside from a main nozzle 42. However, this air flow to be sprayed out of two sub nozzles 43 and 43 is sprayed toward almost the same position to this center line αfrom this side being symmetrized to the center line α of an abradant injection flow of the main nozzle 42. Therefore, since the conical abradant injection flow of the main nozzle 42 is pressurized in a state that it is made so as to be pinched with injection pressure of this air flow from this side, it is deformed to a fluid section being narrow and slender.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a natural silica sand,
Abrasion material consisting of alumina or silicon carbide powder, glass beads, micro steel balls, etc. is jetted at high speed from a jet nozzle together with a fluid such as air to process the work piece into a pattern such as satin finish, glass, silicon wafer, etc. Precision engraving process, engraving process of ribs of plasma display, surface treatment such as coating pretreatment, and blasting process for surface treatment. The present invention relates to a method and apparatus for enlarging the shape and size of an abrasive jet surface (hereinafter referred to as "processing pattern"). In particular, the present invention relates to a method and apparatus for enlarging a processing pattern in suction blast processing.

[0002]

2. Description of the Related Art Conventionally, a suction type injection nozzle of this type of blasting apparatus is, for example, in an injection nozzle 10 as shown in FIG. 7, a nozzle body 11 is provided from a recovery tank of the blasting apparatus via an abrasive hose 31. An abrasive guide chamber 12 is formed in the shape of a substantially cylindrical container that communicates with the abrasive inlet 24 and guides the abrasive. A conical inner surface 16 that is conically narrowed is formed at the front end of the abrasive guide chamber 12. Formed,
A nozzle 14 that penetrates the inner surface 16 of the cone is provided.
Then, inside the conical inner surface 16, the abrasive material guiding chamber 12
The front end portion of the air injection pipe 13 inserted from the rear side is arranged. The air injection pipe 13 is connected to a compressed air supply source (not shown) via a hose 32, and compressed air of relatively high pressure is sent.

Reference numeral 15 denotes a holder, which has a cylindrical shape having a tapered portion on its inner peripheral surface, and is provided on the outer periphery of the holder 15 by fitting the outer peripheral tapered portion of the nozzle 14 with the inner peripheral tapered portion of the holder 15. The nozzle 14 is fixed to the nozzle body 11 by being screwed onto the nozzle body 11 with a screw portion.

When compressed air is jetted from the tip of the air jet pipe 13 toward the nozzle 14, the inside of the abrasive material guiding chamber 12 becomes a negative pressure, and this negative pressure causes the abrasive material in the recovery tank (not shown) to become an abrasive material. It is sucked into the abrasive guide chamber 12 through the hose 31. The abrasive in the abrasive guide chamber 12 is guided to the annular gap between the inner surface 16 of the cone and the outer circumference of the air injection pipe 13, rides on the air flow of the air injection pipe 13, and the nozzle 14
Is sprayed to the outside while being diffused in a conical shape, and a substantially circular machining pattern is formed on the surface of the workpiece as shown in FIG. In the present specification, the effective processing width of the blast processing (simply referred to as “processing width” in the present specification) means, as shown in FIG. 8, 1/2 of the maximum processing depth of the processing pattern. The shape of the surface to be processed at a position is referred to as an area or a major axis and a minor axis.

Blasting is performed by a worker manually operating an injection nozzle to inject an abrasive onto the surface of a workpiece.
There is a case where a blasting machine is installed in the processing line to mechanically move the jet nozzle or the workpiece to jet the abrasive onto the surface of the workpiece, and in either of the former or latter cases, the jet nozzle As shown in FIG. 9, the machining pattern on the surface of the workpiece W is adjacent to the preceding machining pattern in the so-called zigzag shape in the direction of the arrow in FIG. 9 while keeping the ejection distance to the surface of the workpiece almost constant. The jet nozzle or the work piece is moved so as to gradually move to. For example, the former fixes a work piece and manually moves an injection nozzle with respect to the work piece. The latter has the following two methods. One is to move the workpiece to the right in the plane of FIG. 9 in the X direction of FIG. 9, and to move the jet nozzle in the vertical direction of the plane of FIG. 9 in the Y direction of FIG. 9 to gradually change the machining pattern in a zigzag pattern. Automatically move to. Secondly, the workpiece is fixed, and the jet nozzle is gradually and automatically moved in a zigzag pattern in the X direction of FIG. 9 to the left of the paper surface of FIG. 9 and in the Y direction to the up and down direction of the paper surface of FIG. The blasting surface of the workpiece as shown by the chain double-dashed line in FIG. 9 is uniformly blasted while the machining pattern adjacent to the circular machining pattern is overlapped.

[0006]

In order to economically and efficiently perform the blasting by the conventional method, the spraying distance of the polishing material, the spraying angle, the spraying pressure, the mixing ratio of the polishing material and air (concentration, spraying amount). ) Need to be adjusted appropriately. For example, the higher the injection pressure is, the higher the machining efficiency is. Also, the higher the injection pressure is, the longer the injection distance is, and the wider the diffusion area of the abrasive material is. Therefore, the polishing time per unit can be shortened.

However, although the machining efficiency is improved by increasing the injection pressure, the abrasion of the abrasive and the injection nozzle and the like are rapidly increased. Therefore, it is not necessary to increase the injection pressure. Therefore, there is a limit to the diffusion area of the abrasive by this type of injection nozzle, and it is difficult to improve the efficiency of blasting.

Further, according to the conventional blast processing, the density distribution state of the abrasive in the abrasive jet is dense in the central part of the processed pattern and thin in other peripheral parts, so that the processed pattern formed on the workpiece is The central part of the recess of the part is machined deeply, but the other peripheral parts are machined shallowly, and the change rate of the depth of the central part and the peripheral part with respect to the diameter of the machining pattern becomes large, that is, the machining depth direction of the machining pattern. Had a small radius of curvature. As a result, the ratio of the machining width to the diameter of the machining pattern becomes smaller.In order to machine the machining depth of the blasted surface of the workpiece as evenly and evenly as possible, the overlapping dimensions of the machining patterns adjacent to the preceding machining pattern Has to be increased to make the shallow portion of the processing pattern deeper, which inevitably reduces the blast processing efficiency.

Even if the overlapping dimension of the processing pattern adjacent to the previous processing pattern is increased and the blast processing is repeated, in order to make the processing depth of the blast processing surface of the workpiece uniform, the processing pattern is repeated. Since the machining width is small and the radius of curvature in the machining depth direction is small, it is difficult to make the machining depth of the blasting surface of the workpiece uniform.

Therefore, it is difficult to improve both the quality of the blasted surface and the blasting efficiency.

Further, when the processing width of the processing pattern is small, the blasting efficiency cannot be improved unless the feeding speed of the jet nozzle or the workpiece is increased. For example, in order to double the blasting efficiency with a processing pattern having a small processing width, it is necessary to double the feed speed of the workpiece or the injection nozzle. However, if the feed speed of the workpiece or the injection nozzle is increased too much, the desired blasting effect cannot be obtained, so there is a limit. When the limit is reached, it is difficult to further improve the blasting efficiency.

[Object] The present invention was developed in order to solve the above-mentioned problems, and increases the radius of curvature in the machining depth direction in the machining pattern of the blasting process, and the machining width of the machining pattern. The purpose is to improve the quality of the blasted surface by increasing the blasting efficiency to improve the blasting efficiency and further to make the blasting surface uniform in the processing depth.

[0013]

In order to achieve the above object, a method for enlarging a machining pattern in blasting according to the present invention is directed to a main nozzle 42 in front of an air ejection direction of an air injection pipe 13 communicating with a compressed air supply source. The abrasive flow is guided by the air flow of the air injection pipe 13 from the abrasive guide chamber 12 communicating with the abrasive supply source between the air injection pipe 13 and the suction type injection nozzle for sucking the abrasive sucked by this air flow. In the blasting method in which the abrasive in the chamber 12 is jetted from the main nozzle 42 to the workpiece together with the air flow, the abrasive jet from the position opposite to the main nozzle 42 via the center line α of the abrasive jet. By injecting two air streams toward substantially the same position with respect to the center line α of the main nozzle 42, the abrasive jet of the main nozzle 42 is transformed into a narrow and elongated fluid section. And

Since the abrasive jet immediately after being jetted from the main nozzle 42 is not diffused so much, the abrasive jet is effectively transformed into a narrow and elongated fluid cross section. 42 the center line α of the abrasive jet
On the other hand, it is desirable to inject the two air streams toward substantially the same position near the abrasive injection port 18 of the main nozzle 42.

Further, the jet direction of the second air stream forms the same inclination angle θ within the range of 15 to 90 ° with respect to the jet direction of the abrasive material of the main nozzle 42, and the pressure of the second air stream is controlled. It is desirable to set it within the range of 1 to 8 kg / cm ² .

Further, the pressure of the second air flow is 2 to 8 kg.
/ cm ² is preferable, the inclination angle of the second air flow is more preferably 30 ° to 90 °, and particularly preferably, the pressure of the second air flow is 3 kg / cm ² and the inclination angle is 60 °. The material injection flow is effectively transformed into a narrow and elongated fluid cross section to further expand the processing pattern.

Another method of enlarging a processing pattern of the present invention is
In the blasting method using the suction type injection nozzle described above, in front of the abrasive injection direction of the main nozzle 42, the abrasive injection flow of the main nozzle 42 is introduced into a space that defines a narrow and elongated cross-sectional shape, and It is characterized in that the outside air is sucked from both side surfaces corresponding to the long side or the long diameter of the space to diffuse / deform the above-mentioned abrasive jet into the cross-sectional shape of the space.

Further, the external air is introduced into the abrasive jet flow which is hardly diffused immediately after jetting from the main nozzle 42, and as a result, the abrasive jet flow is effectively and narrowly spread. It is particularly desirable to introduce the outside air from the vicinity of the abrasive injection port of the main nozzle in that it deforms into an elongated fluid section.

Further, external air is sucked into the symmetric position with respect to the center line α of the abrasive jet flow of the main nozzle 42 from both side surfaces corresponding to the long side or the long diameter of the space defining the narrow and narrow cross-sectional shape. The outside air can be introduced toward almost the same position with respect to the center line α of the abrasive jet of the main nozzle.

The apparatus for enlarging the processing pattern in the blasting of the present invention comprises a main nozzle 42 in front of the air injection pipe 13 communicating with the compressed air supply source in the air injection direction, and polishing between the air injection pipe 13 and the main nozzle 42. In a blasting apparatus having a suction type injection nozzle including an abrasive guide chamber 12 communicating with a material supply source, two blast processing apparatuses are provided at positions facing each other via a center line α of an abrasive jet injected from the main nozzle 42. And the center line β of the air flow of each of the sub nozzles 43 intersects the center line α of the abrasive jet of the main nozzle 42 at substantially the same position.

Further, the center lines β of the air flows of the two sub-nozzles 43, 43 are provided so as to form the same inclination angle θ with respect to the abrasive jet direction of the main nozzle 42, and the two sub-nozzles 43, 43 are also provided. 43 to the main nozzle 4
Since the jet distances from the tips of the two sub-nozzles 43 and 43 to the abrasive jet are the same and the inclination angle θ is the same, the sub-nozzles 43 are provided at positions symmetrical with respect to the center line α of the second abrasive jet. , 43 by injecting compressed air at the same pressure, the air flow of the two sub-nozzles 43, 43 has almost the same action from the symmetrical position with respect to the abrasive jet of the main nozzle 42. It is particularly desirable in that the abrasive jet of the main nozzle can be effectively transformed into a narrow and elongated fluid cross section, and the pressure of the air flow of each sub-nozzle 43, 43 can be easily adjusted.

Further, the center lines β of the air streams of the two sub nozzles 43 are provided such that they have the same inclination angle within the range of 15 to 90 ° with respect to the abrasive jet direction of the main nozzle 42. , The tilt angle is preferably 30
It is provided in the range of 90 ° to 90 °, and particularly preferably 60 °.

Another processing pattern enlarging device of the present invention is
In the blasting apparatus having the suction type injection nozzle described above, a narrow space having a narrow and narrow cross section is defined in front of the abrasive injection flow of the main nozzle 42, and an opening for ejecting the abrasive at the front end. An abrasive diffusion chamber 52 provided with 54 is provided, and suction holes 53, 5 communicating with the outside air are provided on both side walls 58, 58 which form a long side or a long diameter of the abrasive diffusion chamber 52.
3 is provided.

A plurality of suction holes 53 may be provided at appropriate positions on the both side walls 58, 58. The suction holes are formed on the side walls 58, 58 having the long sides or the long diameter of the abrasive diffusion chamber 52.
58 is located in the vicinity of the abrasive injection port 18 of the main nozzle 42 and symmetrically with respect to the center line α of the abrasive injection flow of the main nozzle 42 so that the air flow sucked from the intake holes 53, 53 is main. It is desirable in that it is introduced into the abrasive jet flow near the abrasive jet 18 of the nozzle 42 to effectively diffuse and deform the fluid cross section of the abrasive jet of the main nozzle 42 into a narrow and slender shape.

[0025]

In the processing pattern enlarging device of the present invention,
Compressed air supplied from a compressed air supply source is supplied to the air injection pipe 13
When sprayed from the to the main nozzle 42, the inside of the abrasive guide chamber 12 has a negative pressure, so that the abrasive in the recovery tank is sucked into the abrasive guide chamber 12. The abrasive in the abrasive guide chamber 12 is guided to the gap between the tip of the air injection pipe 13 and the main nozzle 42, rides on the air flow of the air injection pipe 13, and diffuses conically from the main nozzle 42. And jet. However, the two air streams ejected from the two sub-nozzles 43, 43 are substantially the same with respect to the center line α from the two sides that are symmetrical with respect to the center line α of the abrasive jet of the main nozzle 42. Since it is jetted toward the position, the conical abrasive jet flow of the main nozzle 42 is
Since the pressure is applied from the second side by the pressure of the two air streams 3, 43, the cross section of the abrasive jet in the direction orthogonal to the jet direction of the abrasive jet (in this specification, It is simply referred to as a "fluid cross section") and is deformed into a narrow and slender cross-sectional shape, and jetted while diffusing. Therefore, the processing pattern formed on the surface of the workpiece has a processing width longer than the processing width of the conventional circular processing pattern and has a large curvature radius in the processing depth direction. By moving the jet nozzle 40 in a direction orthogonal to the longitudinal direction of the narrow and narrow fluid cross section of the abrasive jet, the blasting is performed with a long working width of the working pattern, so that the work piece is more conventional. It is processed as a blasted surface with a wide processing width, an efficient and uniform processing depth.

In another processing pattern enlarging device of the present invention, the abrasive jet flow of the main nozzle 42 is jetted while being diffused in a conical shape, and the long side or long diameter side walls 58, 58 of the abrasive diffusion chamber 52. Transform into a collision with. Further, when the abrasive material is injected into the abrasive material diffusion chamber 52, the inside of the abrasive material diffusion chamber 52 becomes a negative pressure due to the abrasive material injection flow, and the suction holes 53, 53.
From the outside becomes an air flow and is sucked into the abrasive diffusion chamber 52. The two air streams of the intake holes 53, 53 are pressurized so as to sandwich the abrasive jet of the main nozzle and are introduced into the abrasive jet, and the abrasive jet is deformed into a narrow and elongated fluid cross section and the opening 54 is formed. Is sprayed toward the surface of the workpiece while diffusing from the surface. Therefore, the processing pattern on the surface of the workpiece has a narrow and elongated shape, and the processing width in the longitudinal direction of this processing pattern is longer than the processing width of the conventional circular processing pattern. By gradually moving the jet nozzle 40 in the direction orthogonal to the longitudinal direction of the machining pattern, the blast machining is performed with the machining width in the longitudinal direction of the machining pattern, and the workpiece is efficiently blasted.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method and apparatus for enlarging a processing pattern in blast processing of the present invention will be described below with reference to the drawings.

[Injection Nozzle] In FIG. 1, reference numeral 40 denotes an injection nozzle, and the nozzle body 11 and each member and structure inside the nozzle body 11 are the same as those of the conventional injection nozzle 10 shown in FIG.
It is similar to the part corresponding to.

The nozzle body 11 has a substantially cylindrical container-shaped abrasive material guiding chamber 12 in which the abrasive material is guided from the recovery tank 70 (FIG. 5) through the abrasive material hose 31 to the abrasive material inlet 24. In addition, a conical inner surface 16 that is conically narrowed is formed at the front end of the abrasive guide chamber 12. Inside the conical inner surface 16, the tip of the air injection pipe 13 inserted from the rear of the abrasive guide chamber 12 is arranged. The air injection pipe 13 is fixed to the rear portion of the nozzle body with a screw 37. Further, the air injection pipe 13 is connected to a compressed air supply source (not shown) via a hose 32, compressed air of relatively high pressure is sent, and an air flow is ejected from the tip of the air injection pipe 13. An air injection pipe cover 17 is provided on the outer circumference of the tip of the air injection pipe 13 in order to prevent abrasion of the abrasive due to impact.

Reference numeral 42 is a main nozzle, which is located at the front of the air injection pipe 13 in the air injection direction, is provided at the tip of the nozzle body 11, and penetrates the inner surface 16 of the cone to guide the abrasive material guiding chamber 1
2, which is in communication with the main nozzle 42, and injects an abrasive jet from the abrasive jet 18 of the main nozzle 42.

As shown in FIG. 1, in the present specification, the center line α of the nozzle diameter of the main nozzle 42 is simply referred to as “center line α” or “center line α of the main nozzle 42”.
The center line simulated as the abrasive jet of the main nozzle 42 is
It is referred to as the "center line α of the abrasive jet."

Further, also in the case of the sub-nozzle 43 described later, the center line of the nozzle diameter of the sub-nozzle 43 is simply referred to as “center line β” or “center line β of the sub-nozzle 43”, and the air flow of the sub-nozzle 43 is sacrificed. The center line thus formed is referred to as “center line β of the air flow of the sub nozzle 43”.

Reference numeral 43 is a sub-nozzle, the details of which are shown in FIG.
An air flow is injected from the side toward the center line α of the abrasive jet flow of the main nozzle 42,
Two sub nozzles 43, 43 are provided. The two sub-nozzles 43, 43 are arranged at positions facing each other through the center line α of the main nozzle 42, and are provided at positions symmetrical with respect to the center line α. Each of them is provided at the same inclination angle θ with respect to the center line α of the abrasive jet of the main nozzle 42, and the center line α of the main nozzle 42 and the center line β of the air flow of each of the sub nozzles 43, 43 are inclined. Make a θ and cross.

In this embodiment, the tilt angle θ is 60 °.
Therefore, the two air streams ejected from the two sub nozzles 43, 43 are ejected toward substantially the same position with respect to the center line α of the abrasive jet of the main nozzle 42, and in the present embodiment, the two air streams are ejected. Is configured to be ejected toward the same position in the vicinity of the abrasive ejection port 18 of the main nozzle 42.

The inclination angle θ is not limited to 60 ° and can be set within the range of 5 to 90 °.

[Blasting device] The jet nozzle 4 described above.
No. 0 is attached to an air suction blasting machine as shown in FIGS.

The blast processing apparatus will be described below. In FIGS. 5 and 6, reference numeral 61 denotes a cabinet, which has a loading port 63 for loading and unloading the workpiece W, and the processing target loaded from the loading port 63 into the cabinet 61. An injection nozzle 40 that injects an abrasive to the object W is provided.

A hopper 68 is provided in the lower part of the cabinet 61, and the lowermost end of the hopper 68 communicates with an upper part of a recovery tank 70 for recovering abrasives installed in the upper part of the cabinet 61 via a conduit 65. .

The recovery tank 70 is a so-called cyclone,
As shown in FIG. 5, it is a device for separating dust from abrasives, and is composed of a cylindrical part having a cylindrical shape in the upper part and a conical part having a conical shape gradually narrowing downward in the lower part. An inlet 73 is provided on the upper side wall of the cylindrical portion of 70,
The tip of the conduit 65 is connected to the inflow port 73 via a communication pipe 75. Since the axial direction of the communication pipe 75 is located in the tangential direction of the inner wall surface forming the circular cross section of the cylindrical portion,
The airflow flowing from the communication pipe 75 into the recovery tank 70 descends while rotating along the inner wall of the cylindrical portion.

The lower end of the conical portion of the recovery tank 70 is provided with an abrasive material adjuster 78 for adjusting the injection amount of the abrasive material injected from the injection nozzle 40.
0 is connected.

On the other hand, a connection pipe 74 is provided substantially at the center of the upper wall surface of the recovery tank 70, and the connection pipe 74 is the discharge pipe 6.
7 to the dust collector 66.

The dust collector 66 rotates the air exhauster 69 to discharge the air in the dust collector 66 to the outside air. The air in the cabinet 61, the conduit 65, and the recovery tank 70 of the blast processing device 60 is sucked by the air blower 69,
Each part has a negative pressure, and the air supplied from a compressed air supply source (not shown) is injected into the injection nozzle 40 together with the abrasive.
Since it is jetted from the
5, the air flow flows to the recovery tank 70 and the dust collector 66.

[Example of Enlargement of Machining Pattern] Using the above-mentioned blasting machine, the workpiece W is charged into the cabinet 61 from the charging port 63, and under the processing conditions shown in Table 1,
The abrasive was sprayed from the spray nozzle 40 onto the surface of the workpiece W for blasting.

[0044]

[Table 1]

Explaining a compressed air supply source not shown, generally, the air compressed to a constant pressure by the compressor is mixed with the oil in the air, but these compressed air and oil are sent to the receiver tank through the pipe. The oil in the air is completely separated by the special separator in the receiver tank, and only clean compressed air is sent to the outside.

Compressed air is supplied from the above-mentioned compressed air supply source to the air injection pipe 13 of the injection nozzle 40 through the hose 32, and the air flow is jetted from the tip of the air injection pipe 13 at high speed (FIG. 1). When this high-speed airflow is sent to the front main nozzle 42, the inside of the abrasive material guiding chamber 12 becomes negative pressure, so that the negative pressure causes the abrasive material in the recovery tank 70 to pass through the abrasive hose 31 and polish the injection nozzle 40. It is sucked into the material guiding chamber 12. The abrasive material in the abrasive material guiding chamber 12 is guided to the annular gap between the inner surface 16 of the cone and the outer circumference of the air injection pipe 13, rides on the air flow of the air injection pipe 13, and is conical from the main nozzle 42 to the outside. It is jetted while diffusing.

However, in FIG. 1, the two air streams jetted from the two sub nozzles 43, 43 at a pressure of 3 kg / cm ² are symmetrical with respect to the center line α of the abrasive jet stream of the main nozzle 42. Since the jetting is performed from the second side toward the same position with respect to the center line α of the abrasive jet with an inclination angle of 60 °, the conical abrasive jet of the main nozzle 42 is directed toward the second side. Since it is pressurized in such a manner that it is sandwiched by the jet pressure of the air flow, it is deformed into a narrow and elongated fluid cross section.
That is, the abrasive jet flow of the main nozzle 42 spreads in the direction orthogonal to the air jet direction of the sub nozzle 43 and in the direction orthogonal to the jet direction of the abrasive jet flow of the main nozzle 42, while the air jets of the sub nozzles 43, 43. It deforms so that it becomes slightly narrower in the direction. After that, the abrasive jet flow is jetted while the shape of the narrow and elongated fluid cross section is diffused as it goes forward in the abrasive jet direction.

As a result, the machining pattern formed on the surface of the workpiece W has an elliptical shape as shown in FIG. 2, and the machining width of the widest portion of the elliptical machining pattern (in this specification, "long And the machining width of the narrowest part of the machining pattern (referred to as "minor axis machining width" in this specification).

The major axis machining width of the elliptical machining pattern of this embodiment is longer than the machining width of the conventional circular machining pattern.

In this embodiment, as shown in FIG. 2, the processing depth of the deepest part in the center of the processing pattern is 1.5 m.
Blasting is stopped when the m reaches m, and the machining width [machining depth is 0.75 mm (the machining depth of the deepest part in the center is 1
The width dimension of the shape at the position (/ 2 position)] was measured, and the processing pattern at this time was 34.84 mm in the major axis processing width of the elliptical shape and 11.39 mm in the minor axis processing width. By the way, since the processing width (conventional processing pattern) of the conical abrasive jet when the air flow is not jetted from the sub-nozzle 43 is 13.2 mm,
The major axis machining width of the elliptical machining pattern of this embodiment is about 2.6 times larger than the conventional one.

Therefore, under the blasting conditions shown in Table 1,
While the ejection nozzle 40 is fixed and the workpiece is automatically moved to keep the ejection distance from the ejection nozzle to the surface of the workpiece substantially constant, the length of the elliptical machining pattern is the same as in FIG. When the blasting was performed by gradually moving in the direction orthogonal to the axis adjacent to the previous processing pattern on the surface of the workpiece W, the blasting was efficiently performed at 2.5 times the speed of the conventional method, and the blasting was also performed. The processing depth of the surface was processed uniformly.

When the inclination angle θ of the sub-nozzle 43 and the pressure of the air flow of the sub-nozzle are variously changed, and when the machining depth of the deepest part in the center of the machining pattern becomes 1.5 mm as in the above-described embodiment. When the blasting was stopped and the long axis and short axis processing widths of the processing pattern were measured, the processing width data (unit: mm) shown in Table 2 were obtained for each processing pattern under each processing condition.

However, in Table 2, "major axis" means the major axis machining width, and "minor axis" means the minor axis machining width.

[0054]

[Table 2]

Although Table 2 does not show data when the inclination angle θ is 90 ° and when the pressure of the air flow of the sub-nozzle 43 is higher than 3 kg / cm ² , the inclination is in view of enlarging the processing pattern. It was effective even when the angle θ was 90 °, and was effective when the pressure of the air flow was up to 8 kg / cm ² .

From Table 2, when the pressure of the air flow of the sub-nozzle 43 is 1 kg / cm ² , when the tilt angle θ is 15 °, the working width of the working pattern cannot be expanded, but the tilt angle θ is 30 °.
In the above, the processing pattern has expanded.

Therefore, when the air flow pressure of the sub nozzle 43 is 1 kg / cm ² , the inclination angle θ of the sub nozzle 43 is 3
It is desirable that the angle is 0 ° to 90 °. By the way, when the tilt angle θ is 75 °, the major axis machining width of the machining pattern is 2
A particularly good result was obtained at 2.78 mm.

Further, the pressure of the air flow of the sub nozzle 43 is 2
At kg / cm ² and 3 kg / cm ² , the processing width of the processing pattern is expanded when the inclination angle θ is 15 ° or more.

Therefore, when the air flow pressure of the sub nozzle 43 is ² to 8 kg / cm ² , the inclination angle θ of the sub nozzle 43 is
Is preferably 15 ° to 90 °.

In Table 2, when the air flow pressure of the sub-nozzle 43 is 3 kg / cm ² and the inclination angle θ is 60 °, the long-axis machining width of the machining pattern is 34.84 mm, which is a particularly good result. Indicated.

In order to effectively transform the abrasive jet of the main nozzle into a narrow and slender fluid cross section, the air streams of the two sub-nozzles 43, 43 have substantially the same pressure as the abrasive jet. It is desirable to work. For that purpose, as in the above-described embodiment, the two sub-nozzles 43, 43 are provided at symmetrical positions with respect to the center line α of the abrasive jet of the main nozzle 42. That is, it is necessary to provide the center lines β of the air flows of the two sub nozzles 43, 43 so that they have the same inclination angle θ with respect to the abrasive jet direction of the main nozzle 42. Since the jet distance from the tip to the abrasive jet is the same and the inclination angle θ is the same, the jet angle of the air flow of the sub nozzle is the same as the jet angle of the abrasive jet of the main nozzle.
If compressed air of the same pressure is supplied to and sprayed on the nozzles 3, 43, a particularly desirable effect is obtained in that the same effect can be exerted on the abrasive jet flow of the main nozzle 42. However, since the injection pressures of the air flows of the sub-nozzles 43, 43 may be adjusted separately, the inclination angles θ of the sub-nozzles 43, 43 do not necessarily have to be the same as in the present embodiment, and the polishing material is not required. The position is not necessarily symmetrical with respect to the centerline α of the jet flow and is not particularly limited.

When the blasting is carried out as described above, the abrasive material jetted from the jet nozzle 40 collides with the workpiece W, and is broken by the impact and is crushed and cannot be reused. Dust, including material and other dust, is generated and mixes into reusable abrasives. The sprayed abrasive and the dust generated at this time fall into the hopper 68 in the lower part of the cabinet 61, and are sent from the inflow port 73 to the recovery tank 70 via the conduit 65 by the air flow generated in the conduit 65. The airflow flowing from the inflow port 73 becomes a rotating airflow and descends while rotating along the inner wall surface of the cylindrical portion by the centrifugal force, and when reaching the conical portion, the conical portion is gradually narrowed downward, The turning radius of the airflow becomes smaller,
Along with that, the rotation speed gradually increases and drops. Abrasives and dust fall in the air stream. When the airflow reaches near the lower end of the conical portion, it reverses and changes direction to become an ascending airflow, which rises while rotating a small amount in the center of the recovery tank 70, from the connecting pipe 74 of the upper end wall of the recovery tank 70 through the discharge pipe 67. It flows to the dust collector 66. However, only the dust of the abrasive and dust that has fallen near the lower end of the conical portion due to the rotating airflow changes its direction and rises in the ascending airflow, but the abrasive does not rise and the rotating airflow occurs at the lower part of the conical portion. It turns with it and gradually falls to the lower part of the recovery tank 70 to be accumulated. On the other hand, the dust is sent from the connecting pipe 74 through the exhaust pipe 67 to the dust collector 66 and accumulated in the dust collector 66 together with the ascending air current, and clean air is discharged from the exhaust fan 69 provided above the dust collector 66. It

[Other Processing Pattern Enlarging Device] In FIGS. 3 and 4, reference numeral 40 a denotes an injection nozzle, which is the nozzle body 1.
1 and each member and structure in the nozzle body 11 are shown in FIG.
This is the same as the portion corresponding to each member of the conventional injection nozzle 10 shown in FIG.

Reference numeral 42 denotes a main nozzle, which is the same as that of the above-described embodiment, is located at the front of the injection pipe 13 in the air injection direction, and is provided at the tip of the nozzle body 11.
An abrasive jet is jetted from the abrasive jet 18 of.

Reference numeral 52 is an abrasive diffusion chamber, which is the main nozzle 42.
Of rectangular parallelepiped box having a narrow and narrow cross-sectional rectangular space in the direction orthogonal to the jet direction of the abrasive jet, and a communicating hole 55 is formed at the approximate center of the rear end face of the abrasive diffusion chamber 52. A screw hole 57 is provided on the inner peripheral surface of the communication hole 55, and the screw hole 57 is screwed onto the outer periphery of the main nozzle 42 so that the abrasive injection port 18 of the main nozzle 42 faces the communication hole 55. There is. On the other hand, the entire front end face of the abrasive diffusion chamber 52 is open. However, the connection method of the main nozzle 42 and the abrasive diffusion chamber 52 is not limited to this embodiment, and the abrasive diffusion chamber 52 is limited to the one having the narrow narrow space having a rectangular cross section. However, for example, a space having a narrow and elongated elliptical cross section or another cross section (for example, a shape formed by combining an arc, another curve, a straight line, or the like) may be defined.

Further, the abrasive diffusion chamber 52 has the intake holes 5 communicating with the outside air to the side walls 58, 58 forming the long sides of the rectangular section.
3, 53 are provided. In this embodiment, the intake holes 53,
Although 53 has a rectangular cross section, it may have a circular shape or another shape,
The shape is not particularly limited. The side walls 58,
Although it is possible to provide a plurality of intake holes 53 at appropriate positions in the nozzle 58, as in the present embodiment, the suction holes 53 are located in the vicinity of the abrasive injection port 18 of the main nozzle 42 and the abrasive injection flow of the main nozzle 42. Positioning symmetrically with respect to the center line α means that the air flow introduced from the intake holes 53, 53 is injected into the abrasive jet of the main nozzle 42 near the abrasive jet 18 and the abrasive jet of the main nozzle 42 is jetted. This is desirable in that it effectively diffuses and deforms the fluid cross section in a narrow and slender manner.

The abrasive spray flow, which is sprayed from the main nozzle 42 while being diffused in a conical shape, collides with both side walls 58, 58 forming the long sides of the rectangular section of the abrasive diffuser chamber 52 to be deflected and diffused. Further, since the abrasive jet flow of the main nozzle is jetted into the abrasive diffusion chamber 52, the inside of the abrasive diffusion chamber 52 becomes negative pressure, so that the air outside the abrasive diffusion chamber 52 is sucked from the intake holes 53, 53. The abrasive is sucked into the abrasive diffusion chamber 52 and flows in as an air flow, and the abrasive jet of the main nozzle is pressurized and sandwiched by the pressures of the two air flows of the intake holes 53, 53 Of the air is introduced into the abrasive jet, and the fluid cross section of the abrasive jet in the abrasive diffusion chamber 52 is deformed into a narrow and elongated cross-sectional shape and jetted while diffusing forward from the opening 54 in the abrasive jet direction. It Therefore, the processing pattern formed on the surface of the workpiece W has a narrow and elongated shape, and the processing width in the longitudinal direction of this processing pattern is
It becomes longer than the processing width of the conventional circular processing pattern. By gradually moving the jet nozzle 40 in the direction orthogonal to the longitudinal direction of the machining pattern as in the above-described embodiment, blast machining is performed with the machining width in the longitudinal direction of the machining pattern, and the workpiece is efficiently processed. Well blasted.

[0068]

Since the present invention is configured as described above, it has the following effects.

(1) In the method and apparatus for enlarging the machining pattern of the present invention, the machining width of the machining pattern can be enlarged by the normal ejection pressure without increasing the ejection pressure of the main nozzle more than necessary. It was possible to improve the blasting efficiency without adversely affecting the wear of the abrasive and the injection nozzle. Incidentally, in the past, as a result of increasing the injection pressure of the main nozzle in order to improve the blasting efficiency, there was an adverse effect such as an increase in early wear of the abrasive and the injection nozzle.

(2) Since the radius of curvature of the machining pattern in the machining depth direction can be increased, the ratio of the machining width to the length of the machining pattern in the longitudinal direction increases, so that the blasting surface of the workpiece is machined. The depth can be machined more uniformly than before, and the quality of the blasted surface can be improved.

(3) Due to the reasons (1) and (2) above, the method and apparatus for enlarging a processed pattern of the present invention can improve both the quality of the blasted surface and the blasting efficiency. It was

(4) By injecting two air streams from positions facing each other through the center line of the abrasive jet flow of the main nozzle to approximately the same position with respect to the center line of the abrasive jet flow, Since the abrasive jet of the nozzle was deformed into a narrow and slender fluid cross section, as a result, a shape having a machining width longer than the conventional circular machining pattern and a large radius of curvature in the machining depth direction It was possible to form a processing pattern on the surface of the workpiece. Therefore, by moving the spray nozzle in a direction orthogonal to the longitudinal direction of the narrow and narrow fluid cross section of the abrasive spray flow, it is possible to efficiently perform blasting with a long working width of the working pattern, and to obtain a uniform working depth. The blasted surface could be obtained.

(5) The center lines of the air streams of the two sub-nozzles are provided so as to form the same inclination angle with respect to the abrasive jet direction of the main nozzle, and the two sub-nozzles are jetted with the abrasive jet of the main nozzle. Since they are placed symmetrically with respect to the center line of the flow, the jet distance from the tip of the two sub-nozzles to the abrasive jet is the same, and the jet angle of the air stream of the two sub-nozzles with respect to the jet of the main nozzle is the same. is there. Therefore, by injecting the compressed air supplied to the sub-nozzle at the same pressure, it is possible to easily make the action of the two air streams almost the same with respect to the abrasive jet, so that the abrasive jet of the main nozzle can be effectively used. It was possible to transform into a narrow and elongated fluid cross section.

(6) Since the air streams of the two sub-nozzles are jetted toward almost the same position near the abrasive jet of the main nozzle with respect to the center line of the abrasive jet of the main nozzle,
Since the second air flow is jetted to the almost non-diffused abrasive jet just after jetting from the main nozzle, the abrasive jet is effectively transformed into a narrow and elongated fluid cross section. I was able to.

(7) In front of the abrasive jet direction of the main nozzle, an opening having a narrow and narrow cross section in the direction orthogonal to the abrasive jet direction and jetting the abrasive at the front end in the abrasive jet direction is provided. Since the provided abrasive diffusion chamber was provided, and the intake holes communicating with the outside air were provided on both side walls forming the long side or the long diameter of the abrasive diffusion chamber, the abrasive jet flow of the main nozzle was long. Colliding with both sides of the side or the major axis and diverting,
Due to both the action of the air flow that flows from the second intake hole toward the center line of the abrasive jet, the abrasive jet diffuses and deforms in the narrow and narrow fluid cross section in the abrasive diffusion chamber. Then, it was sprayed from the opening and the processing width of the processing pattern could be expanded. Therefore, the work piece could be efficiently blasted.

(8) Since the intake holes are located in the vicinity of the abrasive injection port of the main nozzle and symmetrically arranged with respect to the center line of the abrasive injection flow of the main nozzle, the air flow introduced from the intake holes is main. By spraying the abrasive jet in the vicinity of the abrasive jet of the nozzle, the fluid cross section of the abrasive jet of the main nozzle could be effectively diffused and deformed in a narrow width.

[Brief description of drawings]

FIG. 1 is a sectional view showing an entire injection nozzle used in an embodiment of the present invention.

FIG. 2 is a diagram showing a plane and a vertical cross section of a processing pattern according to an embodiment of the present invention.

FIG. 3 is a front view showing a cross section of a main part of an injection nozzle used in another embodiment of the present invention.

FIG. 4 is a side view showing a cross section of a main part of an injection nozzle used in another embodiment of the present invention.

FIG. 5 is a front view showing the entire blasting apparatus used in the embodiment of the present invention.

FIG. 6 is a left side view showing the entire blasting machine used in the embodiment of the present invention.

FIG. 7 is a cross-sectional view showing an entire injection nozzle used in a conventional example.

FIG. 8 is a diagram showing a plane and a vertical cross section of a processing pattern in a conventional example.

FIG. 9 is an explanatory diagram showing a movement state of a machining pattern with respect to a blasting surface of a workpiece in a conventional example.

[Explanation of symbols]

 10 Injection Nozzle 11 Nozzle Body 12 Abrasive Material Induction Chamber 13 Air Injection Tube 14 Nozzle 15 Holder 16 Conical Inner Surface 17 Air Injection Tube Cover 18 Abrasive Material Injection Port 31 Abrasive Material Hose 32 Hose 37 Screw 40, 40a Injection Nozzle 42 Main Nozzle 43 Sub Nozzle 52 Abrasive Diffusion Chamber 53 Intake Hole 54 Abrasive Injection Port 55 Communication Hole 57 Screw Hole 58 Side Wall 60 Blasting Machine 61 Cabinet 65 Conduit 66 Dust Collector 67 Discharge Pipe 68 Hopper 69 Exhaust Fan 70 Recovery Tank 73 Inlet 74 Connection Pipe 75 Communication pipe 78 Abrasive adjuster

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[Procedure amendment]

[Submission date] April 24, 1995

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

[Figure 5]

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 6

[Correction method] Change

[Correction content]

[Figure 6]

Claims (14)

[Claims] Claim: What is claimed is: 1. An air flow of an air injection pipe from an abrasive guide chamber which communicates with an abrasive supply source between a main nozzle and an air injection pipe in front of an air injection pipe communicating with a compressed air supply source. In the blasting method of injecting the abrasive in the abrasive guide chamber from the main nozzle to the work piece together with the air flow by the suction type injection nozzle that sucks the abrasive sucked by the air flow, the abrasive injection flow of the main nozzle Of the abrasive jet from the main nozzle by injecting two air streams from positions facing each other through the center line of the main jet toward almost the same position with respect to the center line of the abrasive jet. A method for enlarging a machining pattern in blasting, which is characterized in that the cross section is deformed. 2. The blasting process according to claim 1, wherein the two air streams are jetted toward substantially the same position near the abrasive jet of the main nozzle with respect to the center line of the abrasive jet of the main nozzle. How to enlarge the processing pattern. 3. The jet direction of the second air stream forms the same inclination angle within a range of 15 to 90 ° with respect to the abrasive jet direction of the main nozzle, and the pressure of the second air stream is 1 to 1. 8 kg / c
The method for enlarging a processing pattern in blasting according to claim 1 or 2, wherein the expansion is within the range of m ² . 4. The pressure of said second air stream is preferably 2-8.
In kg / cm ² , the inclination angle of the second air flow is preferably 30 ° ~
At 90 °, particularly preferably the pressure of the second air stream is 3 kg / cm ²
4. The method for enlarging a processing pattern in blasting according to claim 1, wherein the inclination angle is 60 °. 5. An air flow of an air injection pipe from an abrasive guide chamber communicating with an abrasive supply source between a main nozzle and an air injection pipe in front of an air injection pipe communicating with a compressed air supply source. In a blasting method in which a suction type injection nozzle that sucks the abrasive that has been sucked by an air flow injects the abrasive in the abrasive guide chamber from the main nozzle onto the workpiece with the air flow, the abrasive injection direction of the main nozzle The abrasive jet of the main nozzle is introduced forward into a space that defines a narrow and slender cross-sectional shape, and the outside air is sucked from both side surfaces corresponding to the long side or the long diameter of the space to suck the abrasive. A method for enlarging a processing pattern in blasting, which comprises diffusing and deforming a jet flow into a cross-sectional shape of the space. 6. A method for enlarging a processing pattern in blasting according to claim 5, wherein external air is introduced from the vicinity of the abrasive injection port of the main nozzle. 7. External air is sucked into the symmetrical position with respect to the center line of the abrasive jet flow of the main nozzle from both side surfaces corresponding to the long side or the long diameter of the space defining the narrow and narrow cross-sectional shape,
7. The method for enlarging a processing pattern in blast processing according to claim 5, wherein the outside air is introduced toward the center line of the abrasive jet of the main nozzle substantially at the same position. 8. A suction device comprising a main nozzle in front of an air injection pipe communicating with a compressed air supply source in the direction of air injection, and an abrasive guide chamber communicating with the abrasive supply source between the air injection pipe and the main nozzle. In a blasting apparatus provided with a type injection nozzle, two sub-nozzles are arranged at positions facing each other with a center line of the abrasive jet injected from the main nozzle, and a center line of the air flow of each sub-nozzle is An apparatus for enlarging a processing pattern in a blasting process, characterized by intersecting with a center line of an abrasive jet of a main nozzle at substantially the same position. 9. The center lines of the airflows of the two sub-nozzles are 15 with respect to the abrasive jet direction of the main nozzles, respectively.
The blasting process according to claim 8, wherein the tilt angles are provided so as to form the same tilt angle within a range of to 90 °, the tilt angle is preferably within a range of 30 ° to 90 °, and particularly preferably 60 °. Pattern magnifier. 10. An apparatus for enlarging a processing pattern in blasting according to claim 8, wherein the two sub-nozzles are provided at symmetrical positions with respect to the center line of the abrasive jet of the main nozzle. 11. The center line of the air flow of each sub-nozzle intersects with the center line of the abrasive jet of the main nozzle at substantially the same position in the vicinity of the abrasive jet of the main nozzle. 10. A device for enlarging a processing pattern in the blast processing according to 10. 12. A suction device comprising a main nozzle provided in front of an air injection pipe communicating with a compressed air supply source in the air injection direction, and an abrasive guide chamber communicating with the abrasive supply source between the air injection pipe and the main nozzle. In a blasting apparatus equipped with a spray nozzle, a polishing material having an opening for spraying a polishing material at a front end thereof, which defines a space having a narrow and narrow cross-sectional shape in front of the polishing material spray flow of the main nozzle. An apparatus for enlarging a processing pattern in blasting, characterized in that a diffusion chamber is provided, and suction holes communicating with the outside air are provided on both long sides or long side walls of the abrasive diffusion chamber. 13. An apparatus for enlarging a machining pattern in a blast process according to claim 12, wherein an intake hole of the abrasive diffusion chamber is located near an abrasive injection port of a main nozzle. 14. An apparatus for enlarging a machining pattern in blast machining according to claim 12, wherein the air intake holes on both side walls of the abrasive diffusion chamber are symmetrically located with respect to the center line of the main nozzle.